drivers/net/usb/hso.c

   1 /******************************************************************************
   2  *
   3  * Driver for Option High Speed Mobile Devices.
   4  *
   5  *  Copyright (C) 2008 Option International
   6  *                     Filip Aben <f.aben@option.com>
   7  *                     Denis Joseph Barrow <d.barow@option.com>
   8  *                     Jan Dumon <j.dumon@option.com>
   9  *  Copyright (C) 2007 Andrew Bird (Sphere Systems Ltd)
  10  *                      <ajb@spheresystems.co.uk>
  11  *  Copyright (C) 2008 Greg Kroah-Hartman <gregkh@suse.de>
  12  *  Copyright (C) 2008 Novell, Inc.
  13  *
  14  *  This program is free software; you can redistribute it and/or modify
  15  *  it under the terms of the GNU General Public License version 2 as
  16  *  published by the Free Software Foundation.
  17  *
  18  *  This program is distributed in the hope that it will be useful,
  19  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  *  GNU General Public License for more details.
  22  *
  23  *  You should have received a copy of the GNU General Public License
  24  *  along with this program; if not, write to the Free Software
  25  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
  26  *  USA
  27  *
  28  *
  29  *****************************************************************************/
  30
  31 /******************************************************************************
  32  *
  33  * Description of the device:
  34  *
  35  * Interface 0: Contains the IP network interface on the bulk end points.
  36  *              The multiplexed serial ports are using the interrupt and
  37  *              control endpoints.
  38  *              Interrupt contains a bitmap telling which multiplexed
  39  *              serialport needs servicing.
  40  *
  41  * Interface 1: Diagnostics port, uses bulk only, do not submit urbs until the
  42  *              port is opened, as this have a huge impact on the network port
  43  *              throughput.
  44  *
  45  * Interface 2: Standard modem interface - circuit switched interface, this
  46  *              can be used to make a standard ppp connection however it
  47  *              should not be used in conjunction with the IP network interface
  48  *              enabled for USB performance reasons i.e. if using this set
  49  *              ideally disable_net=1.
  50  *
  51  *****************************************************************************/
  52
  53 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  54
  55 #include <linux/sched/signal.h>
  56 #include <linux/slab.h>
  57 #include <linux/init.h>
  58 #include <linux/delay.h>
  59 #include <linux/netdevice.h>
  60 #include <linux/module.h>
  61 #include <linux/ethtool.h>
  62 #include <linux/usb.h>
  63 #include <linux/tty.h>
  64 #include <linux/tty_driver.h>
  65 #include <linux/tty_flip.h>
  66 #include <linux/kmod.h>
  67 #include <linux/rfkill.h>
  68 #include <linux/ip.h>
  69 #include <linux/uaccess.h>
  70 #include <linux/usb/cdc.h>
  71 #include <net/arp.h>
  72 #include <asm/byteorder.h>
  73 #include <linux/serial_core.h>
  74 #include <linux/serial.h>
  75
  76
  77 #define MOD_AUTHOR                      "Option Wireless"
  78 #define MOD_DESCRIPTION                 "USB High Speed Option driver"
  79
  80 #define HSO_MAX_NET_DEVICES             10
  81 #define HSO__MAX_MTU                    2048
  82 #define DEFAULT_MTU                     1500
  83 #define DEFAULT_MRU                     1500
  84
  85 #define CTRL_URB_RX_SIZE                1024
  86 #define CTRL_URB_TX_SIZE                64
  87
  88 #define BULK_URB_RX_SIZE                4096
  89 #define BULK_URB_TX_SIZE                8192
  90
  91 #define MUX_BULK_RX_BUF_SIZE            HSO__MAX_MTU
  92 #define MUX_BULK_TX_BUF_SIZE            HSO__MAX_MTU
  93 #define MUX_BULK_RX_BUF_COUNT           4
  94 #define USB_TYPE_OPTION_VENDOR          0x20
  95
  96 /* These definitions are used with the struct hso_net flags element */
  97 /* - use *_bit operations on it. (bit indices not values.) */
  98 #define HSO_NET_RUNNING                 0
  99
 100 #define HSO_NET_TX_TIMEOUT              (HZ*10)
 101
 102 #define HSO_SERIAL_MAGIC                0x48534f31
 103
 104 /* Number of ttys to handle */
 105 #define HSO_SERIAL_TTY_MINORS           256
 106
 107 #define MAX_RX_URBS                     2
 108
 109 /*****************************************************************************/
 110 /* Debugging functions                                                       */
 111 /*****************************************************************************/
 112 #define hso_dbg(lvl, fmt, ...)                                          \
 113 do {                                                                    \
 114         if ((lvl) & debug)                                              \
 115                 pr_info("[%d:%s] " fmt,                                 \
 116                         __LINE__, __func__, ##__VA_ARGS__);             \
 117 } while (0)
 118
 119 /*****************************************************************************/
 120 /* Enumerators                                                               */
 121 /*****************************************************************************/
 122 enum pkt_parse_state {
 123         WAIT_IP,
 124         WAIT_DATA,
 125         WAIT_SYNC
 126 };
 127
 128 /*****************************************************************************/
 129 /* Structs                                                                   */
 130 /*****************************************************************************/
 131
 132 struct hso_shared_int {
 133         struct usb_endpoint_descriptor *intr_endp;
 134         void *shared_intr_buf;
 135         struct urb *shared_intr_urb;
 136         struct usb_device *usb;
 137         int use_count;
 138         int ref_count;
 139         struct mutex shared_int_lock;
 140 };
 141
 142 struct hso_net {
 143         struct hso_device *parent;
 144         struct net_device *net;
 145         struct rfkill *rfkill;
 146         char name[24];
 147
 148         struct usb_endpoint_descriptor *in_endp;
 149         struct usb_endpoint_descriptor *out_endp;
 150
 151         struct urb *mux_bulk_rx_urb_pool[MUX_BULK_RX_BUF_COUNT];
 152         struct urb *mux_bulk_tx_urb;
 153         void *mux_bulk_rx_buf_pool[MUX_BULK_RX_BUF_COUNT];
 154         void *mux_bulk_tx_buf;
 155
 156         struct sk_buff *skb_rx_buf;
 157         struct sk_buff *skb_tx_buf;
 158
 159         enum pkt_parse_state rx_parse_state;
 160         spinlock_t net_lock;
 161
 162         unsigned short rx_buf_size;
 163         unsigned short rx_buf_missing;
 164         struct iphdr rx_ip_hdr;
 165
 166         unsigned long flags;
 167 };
 168
 169 enum rx_ctrl_state{
 170         RX_IDLE,
 171         RX_SENT,
 172         RX_PENDING
 173 };
 174
 175 #define BM_REQUEST_TYPE (0xa1)
 176 #define B_NOTIFICATION  (0x20)
 177 #define W_VALUE         (0x0)
 178 #define W_LENGTH        (0x2)
 179
 180 #define B_OVERRUN       (0x1<<6)
 181 #define B_PARITY        (0x1<<5)
 182 #define B_FRAMING       (0x1<<4)
 183 #define B_RING_SIGNAL   (0x1<<3)
 184 #define B_BREAK         (0x1<<2)
 185 #define B_TX_CARRIER    (0x1<<1)
 186 #define B_RX_CARRIER    (0x1<<0)
 187
 188 struct hso_serial_state_notification {
 189         u8 bmRequestType;
 190         u8 bNotification;
 191         u16 wValue;
 192         u16 wIndex;
 193         u16 wLength;
 194         u16 UART_state_bitmap;
 195 } __packed;
 196
 197 struct hso_tiocmget {
 198         struct mutex mutex;
 199         wait_queue_head_t waitq;
 200         int    intr_completed;
 201         struct usb_endpoint_descriptor *endp;
 202         struct urb *urb;
 203         struct hso_serial_state_notification serial_state_notification;
 204         u16    prev_UART_state_bitmap;
 205         struct uart_icount icount;
 206 };
 207
 208
 209 struct hso_serial {
 210         struct hso_device *parent;
 211         int magic;
 212         u8 minor;
 213
 214         struct hso_shared_int *shared_int;
 215
 216         /* rx/tx urb could be either a bulk urb or a control urb depending
 217            on which serial port it is used on. */
 218         struct urb *rx_urb[MAX_RX_URBS];
 219         u8 num_rx_urbs;
 220         u8 *rx_data[MAX_RX_URBS];
 221         u16 rx_data_length;     /* should contain allocated length */
 222
 223         struct urb *tx_urb;
 224         u8 *tx_data;
 225         u8 *tx_buffer;
 226         u16 tx_data_length;     /* should contain allocated length */
 227         u16 tx_data_count;
 228         u16 tx_buffer_count;
 229         struct usb_ctrlrequest ctrl_req_tx;
 230         struct usb_ctrlrequest ctrl_req_rx;
 231
 232         struct usb_endpoint_descriptor *in_endp;
 233         struct usb_endpoint_descriptor *out_endp;
 234
 235         enum rx_ctrl_state rx_state;
 236         u8 rts_state;
 237         u8 dtr_state;
 238         unsigned tx_urb_used:1;
 239
 240         struct tty_port port;
 241         /* from usb_serial_port */
 242         spinlock_t serial_lock;
 243
 244         int (*write_data) (struct hso_serial *serial);
 245         struct hso_tiocmget  *tiocmget;
 246         /* Hacks required to get flow control
 247          * working on the serial receive buffers
 248          * so as not to drop characters on the floor.
 249          */
 250         int  curr_rx_urb_idx;
 251         u8   rx_urb_filled[MAX_RX_URBS];
 252         struct tasklet_struct unthrottle_tasklet;
 253 };
 254
 255 struct hso_device {
 256         union {
 257                 struct hso_serial *dev_serial;
 258                 struct hso_net *dev_net;
 259         } port_data;
 260
 261         u32 port_spec;
 262
 263         u8 is_active;
 264         u8 usb_gone;
 265         struct work_struct async_get_intf;
 266         struct work_struct async_put_intf;
 267
 268         struct usb_device *usb;
 269         struct usb_interface *interface;
 270
 271         struct device *dev;
 272         struct kref ref;
 273         struct mutex mutex;
 274 };
 275
 276 /* Type of interface */
 277 #define HSO_INTF_MASK           0xFF00
 278 #define HSO_INTF_MUX            0x0100
 279 #define HSO_INTF_BULK           0x0200
 280
 281 /* Type of port */
 282 #define HSO_PORT_MASK           0xFF
 283 #define HSO_PORT_NO_PORT        0x0
 284 #define HSO_PORT_CONTROL        0x1
 285 #define HSO_PORT_APP            0x2
 286 #define HSO_PORT_GPS            0x3
 287 #define HSO_PORT_PCSC           0x4
 288 #define HSO_PORT_APP2           0x5
 289 #define HSO_PORT_GPS_CONTROL    0x6
 290 #define HSO_PORT_MSD            0x7
 291 #define HSO_PORT_VOICE          0x8
 292 #define HSO_PORT_DIAG2          0x9
 293 #define HSO_PORT_DIAG           0x10
 294 #define HSO_PORT_MODEM          0x11
 295 #define HSO_PORT_NETWORK        0x12
 296
 297 /* Additional device info */
 298 #define HSO_INFO_MASK           0xFF000000
 299 #define HSO_INFO_CRC_BUG        0x01000000
 300
 301 /*****************************************************************************/
 302 /* Prototypes                                                                */
 303 /*****************************************************************************/
 304 /* Serial driver functions */
 305 static int hso_serial_tiocmset(struct tty_struct *tty,
 306                                unsigned int set, unsigned int clear);
 307 static void ctrl_callback(struct urb *urb);
 308 static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial);
 309 static void hso_kick_transmit(struct hso_serial *serial);
 310 /* Helper functions */
 311 static int hso_mux_submit_intr_urb(struct hso_shared_int *mux_int,
 312                                    struct usb_device *usb, gfp_t gfp);
 313 static void handle_usb_error(int status, const char *function,
 314                              struct hso_device *hso_dev);
 315 static struct usb_endpoint_descriptor *hso_get_ep(struct usb_interface *intf,
 316                                                   int type, int dir);
 317 static int hso_get_mux_ports(struct usb_interface *intf, unsigned char *ports);
 318 static void hso_free_interface(struct usb_interface *intf);
 319 static int hso_start_serial_device(struct hso_device *hso_dev, gfp_t flags);
 320 static int hso_stop_serial_device(struct hso_device *hso_dev);
 321 static int hso_start_net_device(struct hso_device *hso_dev);
 322 static void hso_free_shared_int(struct hso_shared_int *shared_int);
 323 static int hso_stop_net_device(struct hso_device *hso_dev);
 324 static void hso_serial_ref_free(struct kref *ref);
 325 static void hso_std_serial_read_bulk_callback(struct urb *urb);
 326 static int hso_mux_serial_read(struct hso_serial *serial);
 327 static void async_get_intf(struct work_struct *data);
 328 static void async_put_intf(struct work_struct *data);
 329 static int hso_put_activity(struct hso_device *hso_dev);
 330 static int hso_get_activity(struct hso_device *hso_dev);
 331 static void tiocmget_intr_callback(struct urb *urb);
 332 /*****************************************************************************/
 333 /* Helping functions                                                         */
 334 /*****************************************************************************/
 335
 336 /* #define DEBUG */
 337
 338 static inline struct hso_net *dev2net(struct hso_device *hso_dev)
 339 {
 340         return hso_dev->port_data.dev_net;
 341 }
 342
 343 static inline struct hso_serial *dev2ser(struct hso_device *hso_dev)
 344 {
 345         return hso_dev->port_data.dev_serial;
 346 }
 347
 348 /* Debugging functions */
 349 #ifdef DEBUG
 350 static void dbg_dump(int line_count, const char *func_name, unsigned char *buf,
 351                      unsigned int len)
 352 {
 353         static char name[255];
 354
 355         sprintf(name, "hso[%d:%s]", line_count, func_name);
 356         print_hex_dump_bytes(name, DUMP_PREFIX_NONE, buf, len);
 357 }
 358
 359 #define DUMP(buf_, len_)        \
 360         dbg_dump(__LINE__, __func__, (unsigned char *)buf_, len_)
 361
 362 #define DUMP1(buf_, len_)                       \
 363         do {                                    \
 364                 if (0x01 & debug)               \
 365                         DUMP(buf_, len_);       \
 366         } while (0)
 367 #else
 368 #define DUMP(buf_, len_)
 369 #define DUMP1(buf_, len_)
 370 #endif
 371
 372 /* module parameters */
 373 static int debug;
 374 static int tty_major;
 375 static int disable_net;
 376
 377 /* driver info */
 378 static const char driver_name[] = "hso";
 379 static const char tty_filename[] = "ttyHS";
 380 static const char *version = __FILE__ ": " MOD_AUTHOR;
 381 /* the usb driver itself (registered in hso_init) */
 382 static struct usb_driver hso_driver;
 383 /* serial structures */
 384 static struct tty_driver *tty_drv;
 385 static struct hso_device *serial_table[HSO_SERIAL_TTY_MINORS];
 386 static struct hso_device *network_table[HSO_MAX_NET_DEVICES];
 387 static spinlock_t serial_table_lock;
 388
 389 static const s32 default_port_spec[] = {
 390         HSO_INTF_MUX | HSO_PORT_NETWORK,
 391         HSO_INTF_BULK | HSO_PORT_DIAG,
 392         HSO_INTF_BULK | HSO_PORT_MODEM,
 393         0
 394 };
 395
 396 static const s32 icon321_port_spec[] = {
 397         HSO_INTF_MUX | HSO_PORT_NETWORK,
 398         HSO_INTF_BULK | HSO_PORT_DIAG2,
 399         HSO_INTF_BULK | HSO_PORT_MODEM,
 400         HSO_INTF_BULK | HSO_PORT_DIAG,
 401         0
 402 };
 403
 404 #define default_port_device(vendor, product)    \
 405         USB_DEVICE(vendor, product),    \
 406                 .driver_info = (kernel_ulong_t)default_port_spec
 407
 408 #define icon321_port_device(vendor, product)    \
 409         USB_DEVICE(vendor, product),    \
 410                 .driver_info = (kernel_ulong_t)icon321_port_spec
 411
 412 /* list of devices we support */
 413 static const struct usb_device_id hso_ids[] = {
 414         {default_port_device(0x0af0, 0x6711)},
 415         {default_port_device(0x0af0, 0x6731)},
 416         {default_port_device(0x0af0, 0x6751)},
 417         {default_port_device(0x0af0, 0x6771)},
 418         {default_port_device(0x0af0, 0x6791)},
 419         {default_port_device(0x0af0, 0x6811)},
 420         {default_port_device(0x0af0, 0x6911)},
 421         {default_port_device(0x0af0, 0x6951)},
 422         {default_port_device(0x0af0, 0x6971)},
 423         {default_port_device(0x0af0, 0x7011)},
 424         {default_port_device(0x0af0, 0x7031)},
 425         {default_port_device(0x0af0, 0x7051)},
 426         {default_port_device(0x0af0, 0x7071)},
 427         {default_port_device(0x0af0, 0x7111)},
 428         {default_port_device(0x0af0, 0x7211)},
 429         {default_port_device(0x0af0, 0x7251)},
 430         {default_port_device(0x0af0, 0x7271)},
 431         {default_port_device(0x0af0, 0x7311)},
 432         {default_port_device(0x0af0, 0xc031)},  /* Icon-Edge */
 433         {icon321_port_device(0x0af0, 0xd013)},  /* Module HSxPA */
 434         {icon321_port_device(0x0af0, 0xd031)},  /* Icon-321 */
 435         {icon321_port_device(0x0af0, 0xd033)},  /* Icon-322 */
 436         {USB_DEVICE(0x0af0, 0x7301)},           /* GE40x */
 437         {USB_DEVICE(0x0af0, 0x7361)},           /* GE40x */
 438         {USB_DEVICE(0x0af0, 0x7381)},           /* GE40x */
 439         {USB_DEVICE(0x0af0, 0x7401)},           /* GI 0401 */
 440         {USB_DEVICE(0x0af0, 0x7501)},           /* GTM 382 */
 441         {USB_DEVICE(0x0af0, 0x7601)},           /* GE40x */
 442         {USB_DEVICE(0x0af0, 0x7701)},
 443         {USB_DEVICE(0x0af0, 0x7706)},
 444         {USB_DEVICE(0x0af0, 0x7801)},
 445         {USB_DEVICE(0x0af0, 0x7901)},
 446         {USB_DEVICE(0x0af0, 0x7A01)},
 447         {USB_DEVICE(0x0af0, 0x7A05)},
 448         {USB_DEVICE(0x0af0, 0x8200)},
 449         {USB_DEVICE(0x0af0, 0x8201)},
 450         {USB_DEVICE(0x0af0, 0x8300)},
 451         {USB_DEVICE(0x0af0, 0x8302)},
 452         {USB_DEVICE(0x0af0, 0x8304)},
 453         {USB_DEVICE(0x0af0, 0x8400)},
 454         {USB_DEVICE(0x0af0, 0x8600)},
 455         {USB_DEVICE(0x0af0, 0x8800)},
 456         {USB_DEVICE(0x0af0, 0x8900)},
 457         {USB_DEVICE(0x0af0, 0x9000)},
 458         {USB_DEVICE(0x0af0, 0x9200)},           /* Option GTM671WFS */
 459         {USB_DEVICE(0x0af0, 0xd035)},
 460         {USB_DEVICE(0x0af0, 0xd055)},
 461         {USB_DEVICE(0x0af0, 0xd155)},
 462         {USB_DEVICE(0x0af0, 0xd255)},
 463         {USB_DEVICE(0x0af0, 0xd057)},
 464         {USB_DEVICE(0x0af0, 0xd157)},
 465         {USB_DEVICE(0x0af0, 0xd257)},
 466         {USB_DEVICE(0x0af0, 0xd357)},
 467         {USB_DEVICE(0x0af0, 0xd058)},
 468         {USB_DEVICE(0x0af0, 0xc100)},
 469         {}
 470 };
 471 MODULE_DEVICE_TABLE(usb, hso_ids);
 472
 473 /* Sysfs attribute */
 474 static ssize_t hso_sysfs_show_porttype(struct device *dev,
 475                                        struct device_attribute *attr,
 476                                        char *buf)
 477 {
 478         struct hso_device *hso_dev = dev_get_drvdata(dev);
 479         char *port_name;
 480
 481         if (!hso_dev)
 482                 return 0;
 483
 484         switch (hso_dev->port_spec & HSO_PORT_MASK) {
 485         case HSO_PORT_CONTROL:
 486                 port_name = "Control";
 487                 break;
 488         case HSO_PORT_APP:
 489                 port_name = "Application";
 490                 break;
 491         case HSO_PORT_APP2:
 492                 port_name = "Application2";
 493                 break;
 494         case HSO_PORT_GPS:
 495                 port_name = "GPS";
 496                 break;
 497         case HSO_PORT_GPS_CONTROL:
 498                 port_name = "GPS Control";
 499                 break;
 500         case HSO_PORT_PCSC:
 501                 port_name = "PCSC";
 502                 break;
 503         case HSO_PORT_DIAG:
 504                 port_name = "Diagnostic";
 505                 break;
 506         case HSO_PORT_DIAG2:
 507                 port_name = "Diagnostic2";
 508                 break;
 509         case HSO_PORT_MODEM:
 510                 port_name = "Modem";
 511                 break;
 512         case HSO_PORT_NETWORK:
 513                 port_name = "Network";
 514                 break;
 515         default:
 516                 port_name = "Unknown";
 517                 break;
 518         }
 519
 520         return sprintf(buf, "%s\n", port_name);
 521 }
 522 static DEVICE_ATTR(hsotype, 0444, hso_sysfs_show_porttype, NULL);
 523
 524 static struct attribute *hso_serial_dev_attrs[] = {
 525         &dev_attr_hsotype.attr,
 526         NULL
 527 };
 528
 529 ATTRIBUTE_GROUPS(hso_serial_dev);
 530
 531 static int hso_urb_to_index(struct hso_serial *serial, struct urb *urb)
 532 {
 533         int idx;
 534
 535         for (idx = 0; idx < serial->num_rx_urbs; idx++)
 536                 if (serial->rx_urb[idx] == urb)
 537                         return idx;
 538         dev_err(serial->parent->dev, "hso_urb_to_index failed\n");
 539         return -1;
 540 }
 541
 542 /* converts mux value to a port spec value */
 543 static u32 hso_mux_to_port(int mux)
 544 {
 545         u32 result;
 546
 547         switch (mux) {
 548         case 0x1:
 549                 result = HSO_PORT_CONTROL;
 550                 break;
 551         case 0x2:
 552                 result = HSO_PORT_APP;
 553                 break;
 554         case 0x4:
 555                 result = HSO_PORT_PCSC;
 556                 break;
 557         case 0x8:
 558                 result = HSO_PORT_GPS;
 559                 break;
 560         case 0x10:
 561                 result = HSO_PORT_APP2;
 562                 break;
 563         default:
 564                 result = HSO_PORT_NO_PORT;
 565         }
 566         return result;
 567 }
 568
 569 /* converts port spec value to a mux value */
 570 static u32 hso_port_to_mux(int port)
 571 {
 572         u32 result;
 573
 574         switch (port & HSO_PORT_MASK) {
 575         case HSO_PORT_CONTROL:
 576                 result = 0x0;
 577                 break;
 578         case HSO_PORT_APP:
 579                 result = 0x1;
 580                 break;
 581         case HSO_PORT_PCSC:
 582                 result = 0x2;
 583                 break;
 584         case HSO_PORT_GPS:
 585                 result = 0x3;
 586                 break;
 587         case HSO_PORT_APP2:
 588                 result = 0x4;
 589                 break;
 590         default:
 591                 result = 0x0;
 592         }
 593         return result;
 594 }
 595
 596 static struct hso_serial *get_serial_by_shared_int_and_type(
 597                                         struct hso_shared_int *shared_int,
 598                                         int mux)
 599 {
 600         int i, port;
 601
 602         port = hso_mux_to_port(mux);
 603
 604         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
 605                 if (serial_table[i] &&
 606                     (dev2ser(serial_table[i])->shared_int == shared_int) &&
 607                     ((serial_table[i]->port_spec & HSO_PORT_MASK) == port)) {
 608                         return dev2ser(serial_table[i]);
 609                 }
 610         }
 611
 612         return NULL;
 613 }
 614
 615 static struct hso_serial *get_serial_by_index(unsigned index)
 616 {
 617         struct hso_serial *serial = NULL;
 618         unsigned long flags;
 619
 620         spin_lock_irqsave(&serial_table_lock, flags);
 621         if (serial_table[index])
 622                 serial = dev2ser(serial_table[index]);
 623         spin_unlock_irqrestore(&serial_table_lock, flags);
 624
 625         return serial;
 626 }
 627
 628 static int obtain_minor(struct hso_serial *serial)
 629 {
 630         int index;
 631         unsigned long flags;
 632
 633         spin_lock_irqsave(&serial_table_lock, flags);
 634         for (index = 0; index < HSO_SERIAL_TTY_MINORS; index++) {
 635                 if (serial_table[index] == NULL) {
 636                         serial_table[index] = serial->parent;
 637                         serial->minor = index;
 638                         spin_unlock_irqrestore(&serial_table_lock, flags);
 639                         return 0;
 640                 }
 641         }
 642         spin_unlock_irqrestore(&serial_table_lock, flags);
 643
 644         pr_err("%s: no free serial devices in table\n", __func__);
 645         return -1;
 646 }
 647
 648 static void release_minor(struct hso_serial *serial)
 649 {
 650         unsigned long flags;
 651
 652         spin_lock_irqsave(&serial_table_lock, flags);
 653         serial_table[serial->minor] = NULL;
 654         spin_unlock_irqrestore(&serial_table_lock, flags);
 655 }
 656
 657 static void handle_usb_error(int status, const char *function,
 658                              struct hso_device *hso_dev)
 659 {
 660         char *explanation;
 661
 662         switch (status) {
 663         case -ENODEV:
 664                 explanation = "no device";
 665                 break;
 666         case -ENOENT:
 667                 explanation = "endpoint not enabled";
 668                 break;
 669         case -EPIPE:
 670                 explanation = "endpoint stalled";
 671                 break;
 672         case -ENOSPC:
 673                 explanation = "not enough bandwidth";
 674                 break;
 675         case -ESHUTDOWN:
 676                 explanation = "device disabled";
 677                 break;
 678         case -EHOSTUNREACH:
 679                 explanation = "device suspended";
 680                 break;
 681         case -EINVAL:
 682         case -EAGAIN:
 683         case -EFBIG:
 684         case -EMSGSIZE:
 685                 explanation = "internal error";
 686                 break;
 687         case -EILSEQ:
 688         case -EPROTO:
 689         case -ETIME:
 690         case -ETIMEDOUT:
 691                 explanation = "protocol error";
 692                 if (hso_dev)
 693                         usb_queue_reset_device(hso_dev->interface);
 694                 break;
 695         default:
 696                 explanation = "unknown status";
 697                 break;
 698         }
 699
 700         /* log a meaningful explanation of an USB status */
 701         hso_dbg(0x1, "%s: received USB status - %s (%d)\n",
 702                 function, explanation, status);
 703 }
 704
 705 /* Network interface functions */
 706
 707 /* called when net interface is brought up by ifconfig */
 708 static int hso_net_open(struct net_device *net)
 709 {
 710         struct hso_net *odev = netdev_priv(net);
 711         unsigned long flags = 0;
 712
 713         if (!odev) {
 714                 dev_err(&net->dev, "No net device !\n");
 715                 return -ENODEV;
 716         }
 717
 718         odev->skb_tx_buf = NULL;
 719
 720         /* setup environment */
 721         spin_lock_irqsave(&odev->net_lock, flags);
 722         odev->rx_parse_state = WAIT_IP;
 723         odev->rx_buf_size = 0;
 724         odev->rx_buf_missing = sizeof(struct iphdr);
 725         spin_unlock_irqrestore(&odev->net_lock, flags);
 726
 727         /* We are up and running. */
 728         set_bit(HSO_NET_RUNNING, &odev->flags);
 729         hso_start_net_device(odev->parent);
 730
 731         /* Tell the kernel we are ready to start receiving from it */
 732         netif_start_queue(net);
 733
 734         return 0;
 735 }
 736
 737 /* called when interface is brought down by ifconfig */
 738 static int hso_net_close(struct net_device *net)
 739 {
 740         struct hso_net *odev = netdev_priv(net);
 741
 742         /* we don't need the queue anymore */
 743         netif_stop_queue(net);
 744         /* no longer running */
 745         clear_bit(HSO_NET_RUNNING, &odev->flags);
 746
 747         hso_stop_net_device(odev->parent);
 748
 749         /* done */
 750         return 0;
 751 }
 752
 753 /* USB tells is xmit done, we should start the netqueue again */
 754 static void write_bulk_callback(struct urb *urb)
 755 {
 756         struct hso_net *odev = urb->context;
 757         int status = urb->status;
 758
 759         /* Sanity check */
 760         if (!odev || !test_bit(HSO_NET_RUNNING, &odev->flags)) {
 761                 dev_err(&urb->dev->dev, "%s: device not running\n", __func__);
 762                 return;
 763         }
 764
 765         /* Do we still have a valid kernel network device? */
 766         if (!netif_device_present(odev->net)) {
 767                 dev_err(&urb->dev->dev, "%s: net device not present\n",
 768                         __func__);
 769                 return;
 770         }
 771
 772         /* log status, but don't act on it, we don't need to resubmit anything
 773          * anyhow */
 774         if (status)
 775                 handle_usb_error(status, __func__, odev->parent);
 776
 777         hso_put_activity(odev->parent);
 778
 779         /* Tell the network interface we are ready for another frame */
 780         netif_wake_queue(odev->net);
 781 }
 782
 783 /* called by kernel when we need to transmit a packet */
 784 static netdev_tx_t hso_net_start_xmit(struct sk_buff *skb,
 785                                             struct net_device *net)
 786 {
 787         struct hso_net *odev = netdev_priv(net);
 788         int result;
 789
 790         /* Tell the kernel, "No more frames 'til we are done with this one." */
 791         netif_stop_queue(net);
 792         if (hso_get_activity(odev->parent) == -EAGAIN) {
 793                 odev->skb_tx_buf = skb;
 794                 return NETDEV_TX_OK;
 795         }
 796
 797         /* log if asked */
 798         DUMP1(skb->data, skb->len);
 799         /* Copy it from kernel memory to OUR memory */
 800         memcpy(odev->mux_bulk_tx_buf, skb->data, skb->len);
 801         hso_dbg(0x1, "len: %d/%d\n", skb->len, MUX_BULK_TX_BUF_SIZE);
 802
 803         /* Fill in the URB for shipping it out. */
 804         usb_fill_bulk_urb(odev->mux_bulk_tx_urb,
 805                           odev->parent->usb,
 806                           usb_sndbulkpipe(odev->parent->usb,
 807                                           odev->out_endp->
 808                                           bEndpointAddress & 0x7F),
 809                           odev->mux_bulk_tx_buf, skb->len, write_bulk_callback,
 810                           odev);
 811
 812         /* Deal with the Zero Length packet problem, I hope */
 813         odev->mux_bulk_tx_urb->transfer_flags |= URB_ZERO_PACKET;
 814
 815         /* Send the URB on its merry way. */
 816         result = usb_submit_urb(odev->mux_bulk_tx_urb, GFP_ATOMIC);
 817         if (result) {
 818                 dev_warn(&odev->parent->interface->dev,
 819                         "failed mux_bulk_tx_urb %d\n", result);
 820                 net->stats.tx_errors++;
 821                 netif_start_queue(net);
 822         } else {
 823                 net->stats.tx_packets++;
 824                 net->stats.tx_bytes += skb->len;
 825         }
 826         dev_kfree_skb(skb);
 827         /* we're done */
 828         return NETDEV_TX_OK;
 829 }
 830
 831 static const struct ethtool_ops ops = {
 832         .get_link = ethtool_op_get_link
 833 };
 834
 835 /* called when a packet did not ack after watchdogtimeout */
 836 static void hso_net_tx_timeout(struct net_device *net)
 837 {
 838         struct hso_net *odev = netdev_priv(net);
 839
 840         if (!odev)
 841                 return;
 842
 843         /* Tell syslog we are hosed. */
 844         dev_warn(&net->dev, "Tx timed out.\n");
 845
 846         /* Tear the waiting frame off the list */
 847         if (odev->mux_bulk_tx_urb &&
 848             (odev->mux_bulk_tx_urb->status == -EINPROGRESS))
 849                 usb_unlink_urb(odev->mux_bulk_tx_urb);
 850
 851         /* Update statistics */
 852         net->stats.tx_errors++;
 853 }
 854
 855 /* make a real packet from the received USB buffer */
 856 static void packetizeRx(struct hso_net *odev, unsigned char *ip_pkt,
 857                         unsigned int count, unsigned char is_eop)
 858 {
 859         unsigned short temp_bytes;
 860         unsigned short buffer_offset = 0;
 861         unsigned short frame_len;
 862
 863         /* log if needed */
 864         hso_dbg(0x1, "Rx %d bytes\n", count);
 865         DUMP(ip_pkt, min(128, (int)count));
 866
 867         while (count) {
 868                 switch (odev->rx_parse_state) {
 869                 case WAIT_IP:
 870                         /* waiting for IP header. */
 871                         /* wanted bytes - size of ip header */
 872                         temp_bytes =
 873                             (count <
 874                              odev->rx_buf_missing) ? count : odev->
 875                             rx_buf_missing;
 876
 877                         memcpy(((unsigned char *)(&odev->rx_ip_hdr)) +
 878                                odev->rx_buf_size, ip_pkt + buffer_offset,
 879                                temp_bytes);
 880
 881                         odev->rx_buf_size += temp_bytes;
 882                         buffer_offset += temp_bytes;
 883                         odev->rx_buf_missing -= temp_bytes;
 884                         count -= temp_bytes;
 885
 886                         if (!odev->rx_buf_missing) {
 887                                 /* header is complete allocate an sk_buffer and
 888                                  * continue to WAIT_DATA */
 889                                 frame_len = ntohs(odev->rx_ip_hdr.tot_len);
 890
 891                                 if ((frame_len > DEFAULT_MRU) ||
 892                                     (frame_len < sizeof(struct iphdr))) {
 893                                         dev_err(&odev->net->dev,
 894                                                 "Invalid frame (%d) length\n",
 895                                                 frame_len);
 896                                         odev->rx_parse_state = WAIT_SYNC;
 897                                         continue;
 898                                 }
 899                                 /* Allocate an sk_buff */
 900                                 odev->skb_rx_buf = netdev_alloc_skb(odev->net,
 901                                                                     frame_len);
 902                                 if (!odev->skb_rx_buf) {
 903                                         /* We got no receive buffer. */
 904                                         hso_dbg(0x1, "could not allocate memory\n");
 905                                         odev->rx_parse_state = WAIT_SYNC;
 906                                         continue;
 907                                 }
 908
 909                                 /* Copy what we got so far. make room for iphdr
 910                                  * after tail. */
 911                                 skb_put_data(odev->skb_rx_buf,
 912                                              (char *)&(odev->rx_ip_hdr),
 913                                              sizeof(struct iphdr));
 914
 915                                 /* ETH_HLEN */
 916                                 odev->rx_buf_size = sizeof(struct iphdr);
 917
 918                                 /* Filip actually use .tot_len */
 919                                 odev->rx_buf_missing =
 920                                     frame_len - sizeof(struct iphdr);
 921                                 odev->rx_parse_state = WAIT_DATA;
 922                         }
 923                         break;
 924
 925                 case WAIT_DATA:
 926                         temp_bytes = (count < odev->rx_buf_missing)
 927                                         ? count : odev->rx_buf_missing;
 928
 929                         /* Copy the rest of the bytes that are left in the
 930                          * buffer into the waiting sk_buf. */
 931                         /* Make room for temp_bytes after tail. */
 932                         skb_put_data(odev->skb_rx_buf,
 933                                      ip_pkt + buffer_offset,
 934                                      temp_bytes);
 935
 936                         odev->rx_buf_missing -= temp_bytes;
 937                         count -= temp_bytes;
 938                         buffer_offset += temp_bytes;
 939                         odev->rx_buf_size += temp_bytes;
 940                         if (!odev->rx_buf_missing) {
 941                                 /* Packet is complete. Inject into stack. */
 942                                 /* We have IP packet here */
 943                                 odev->skb_rx_buf->protocol = cpu_to_be16(ETH_P_IP);
 944                                 skb_reset_mac_header(odev->skb_rx_buf);
 945
 946                                 /* Ship it off to the kernel */
 947                                 netif_rx(odev->skb_rx_buf);
 948                                 /* No longer our buffer. */
 949                                 odev->skb_rx_buf = NULL;
 950
 951                                 /* update out statistics */
 952                                 odev->net->stats.rx_packets++;
 953
 954                                 odev->net->stats.rx_bytes += odev->rx_buf_size;
 955
 956                                 odev->rx_buf_size = 0;
 957                                 odev->rx_buf_missing = sizeof(struct iphdr);
 958                                 odev->rx_parse_state = WAIT_IP;
 959                         }
 960                         break;
 961
 962                 case WAIT_SYNC:
 963                         hso_dbg(0x1, " W_S\n");
 964                         count = 0;
 965                         break;
 966                 default:
 967                         hso_dbg(0x1, "\n");
 968                         count--;
 969                         break;
 970                 }
 971         }
 972
 973         /* Recovery mechanism for WAIT_SYNC state. */
 974         if (is_eop) {
 975                 if (odev->rx_parse_state == WAIT_SYNC) {
 976                         odev->rx_parse_state = WAIT_IP;
 977                         odev->rx_buf_size = 0;
 978                         odev->rx_buf_missing = sizeof(struct iphdr);
 979                 }
 980         }
 981 }
 982
 983 static void fix_crc_bug(struct urb *urb, __le16 max_packet_size)
 984 {
 985         static const u8 crc_check[4] = { 0xDE, 0xAD, 0xBE, 0xEF };
 986         u32 rest = urb->actual_length % le16_to_cpu(max_packet_size);
 987
 988         if (((rest == 5) || (rest == 6)) &&
 989             !memcmp(((u8 *)urb->transfer_buffer) + urb->actual_length - 4,
 990                     crc_check, 4)) {
 991                 urb->actual_length -= 4;
 992         }
 993 }
 994
 995 /* Moving data from usb to kernel (in interrupt state) */
 996 static void read_bulk_callback(struct urb *urb)
 997 {
 998         struct hso_net *odev = urb->context;
 999         struct net_device *net;
1000         int result;
1001         unsigned long flags;
1002         int status = urb->status;
1003
1004         /* is al ok?  (Filip: Who's Al ?) */
1005         if (status) {
1006                 handle_usb_error(status, __func__, odev->parent);
1007                 return;
1008         }
1009
1010         /* Sanity check */
1011         if (!odev || !test_bit(HSO_NET_RUNNING, &odev->flags)) {
1012                 hso_dbg(0x1, "BULK IN callback but driver is not active!\n");
1013                 return;
1014         }
1015         usb_mark_last_busy(urb->dev);
1016
1017         net = odev->net;
1018
1019         if (!netif_device_present(net)) {
1020                 /* Somebody killed our network interface... */
1021                 return;
1022         }
1023
1024         if (odev->parent->port_spec & HSO_INFO_CRC_BUG)
1025                 fix_crc_bug(urb, odev->in_endp->wMaxPacketSize);
1026
1027         /* do we even have a packet? */
1028         if (urb->actual_length) {
1029                 /* Handle the IP stream, add header and push it onto network
1030                  * stack if the packet is complete. */
1031                 spin_lock_irqsave(&odev->net_lock, flags);
1032                 packetizeRx(odev, urb->transfer_buffer, urb->actual_length,
1033                             (urb->transfer_buffer_length >
1034                              urb->actual_length) ? 1 : 0);
1035                 spin_unlock_irqrestore(&odev->net_lock, flags);
1036         }
1037
1038         /* We are done with this URB, resubmit it. Prep the USB to wait for
1039          * another frame. Reuse same as received. */
1040         usb_fill_bulk_urb(urb,
1041                           odev->parent->usb,
1042                           usb_rcvbulkpipe(odev->parent->usb,
1043                                           odev->in_endp->
1044                                           bEndpointAddress & 0x7F),
1045                           urb->transfer_buffer, MUX_BULK_RX_BUF_SIZE,
1046                           read_bulk_callback, odev);
1047
1048         /* Give this to the USB subsystem so it can tell us when more data
1049          * arrives. */
1050         result = usb_submit_urb(urb, GFP_ATOMIC);
1051         if (result)
1052                 dev_warn(&odev->parent->interface->dev,
1053                          "%s failed submit mux_bulk_rx_urb %d\n", __func__,
1054                          result);
1055 }
1056
1057 /* Serial driver functions */
1058
1059 static void hso_init_termios(struct ktermios *termios)
1060 {
1061         /*
1062          * The default requirements for this device are:
1063          */
1064         termios->c_iflag &=
1065                 ~(IGNBRK        /* disable ignore break */
1066                 | BRKINT        /* disable break causes interrupt */
1067                 | PARMRK        /* disable mark parity errors */
1068                 | ISTRIP        /* disable clear high bit of input characters */
1069                 | INLCR         /* disable translate NL to CR */
1070                 | IGNCR         /* disable ignore CR */
1071                 | ICRNL         /* disable translate CR to NL */
1072                 | IXON);        /* disable enable XON/XOFF flow control */
1073
1074         /* disable postprocess output characters */
1075         termios->c_oflag &= ~OPOST;
1076
1077         termios->c_lflag &=
1078                 ~(ECHO          /* disable echo input characters */
1079                 | ECHONL        /* disable echo new line */
1080                 | ICANON        /* disable erase, kill, werase, and rprnt
1081                                    special characters */
1082                 | ISIG          /* disable interrupt, quit, and suspend special
1083                                    characters */
1084                 | IEXTEN);      /* disable non-POSIX special characters */
1085
1086         termios->c_cflag &=
1087                 ~(CSIZE         /* no size */
1088                 | PARENB        /* disable parity bit */
1089                 | CBAUD         /* clear current baud rate */
1090                 | CBAUDEX);     /* clear current buad rate */
1091
1092         termios->c_cflag |= CS8;        /* character size 8 bits */
1093
1094         /* baud rate 115200 */
1095         tty_termios_encode_baud_rate(termios, 115200, 115200);
1096 }
1097
1098 static void _hso_serial_set_termios(struct tty_struct *tty,
1099                                     struct ktermios *old)
1100 {
1101         struct hso_serial *serial = tty->driver_data;
1102
1103         if (!serial) {
1104                 pr_err("%s: no tty structures", __func__);
1105                 return;
1106         }
1107
1108         hso_dbg(0x8, "port %d\n", serial->minor);
1109
1110         /*
1111          *      Fix up unsupported bits
1112          */
1113         tty->termios.c_iflag &= ~IXON; /* disable enable XON/XOFF flow control */
1114
1115         tty->termios.c_cflag &=
1116                 ~(CSIZE         /* no size */
1117                 | PARENB        /* disable parity bit */
1118                 | CBAUD         /* clear current baud rate */
1119                 | CBAUDEX);     /* clear current buad rate */
1120
1121         tty->termios.c_cflag |= CS8;    /* character size 8 bits */
1122
1123         /* baud rate 115200 */
1124         tty_encode_baud_rate(tty, 115200, 115200);
1125 }
1126
1127 static void hso_resubmit_rx_bulk_urb(struct hso_serial *serial, struct urb *urb)
1128 {
1129         int result;
1130         /* We are done with this URB, resubmit it. Prep the USB to wait for
1131          * another frame */
1132         usb_fill_bulk_urb(urb, serial->parent->usb,
1133                           usb_rcvbulkpipe(serial->parent->usb,
1134                                           serial->in_endp->
1135                                           bEndpointAddress & 0x7F),
1136                           urb->transfer_buffer, serial->rx_data_length,
1137                           hso_std_serial_read_bulk_callback, serial);
1138         /* Give this to the USB subsystem so it can tell us when more data
1139          * arrives. */
1140         result = usb_submit_urb(urb, GFP_ATOMIC);
1141         if (result) {
1142                 dev_err(&urb->dev->dev, "%s failed submit serial rx_urb %d\n",
1143                         __func__, result);
1144         }
1145 }
1146
1147
1148
1149
1150 static void put_rxbuf_data_and_resubmit_bulk_urb(struct hso_serial *serial)
1151 {
1152         int count;
1153         struct urb *curr_urb;
1154
1155         while (serial->rx_urb_filled[serial->curr_rx_urb_idx]) {
1156                 curr_urb = serial->rx_urb[serial->curr_rx_urb_idx];
1157                 count = put_rxbuf_data(curr_urb, serial);
1158                 if (count == -1)
1159                         return;
1160                 if (count == 0) {
1161                         serial->curr_rx_urb_idx++;
1162                         if (serial->curr_rx_urb_idx >= serial->num_rx_urbs)
1163                                 serial->curr_rx_urb_idx = 0;
1164                         hso_resubmit_rx_bulk_urb(serial, curr_urb);
1165                 }
1166         }
1167 }
1168
1169 static void put_rxbuf_data_and_resubmit_ctrl_urb(struct hso_serial *serial)
1170 {
1171         int count = 0;
1172         struct urb *urb;
1173
1174         urb = serial->rx_urb[0];
1175         if (serial->port.count > 0) {
1176                 count = put_rxbuf_data(urb, serial);
1177                 if (count == -1)
1178                         return;
1179         }
1180         /* Re issue a read as long as we receive data. */
1181
1182         if (count == 0 && ((urb->actual_length != 0) ||
1183                            (serial->rx_state == RX_PENDING))) {
1184                 serial->rx_state = RX_SENT;
1185                 hso_mux_serial_read(serial);
1186         } else
1187                 serial->rx_state = RX_IDLE;
1188 }
1189
1190
1191 /* read callback for Diag and CS port */
1192 static void hso_std_serial_read_bulk_callback(struct urb *urb)
1193 {
1194         struct hso_serial *serial = urb->context;
1195         int status = urb->status;
1196         unsigned long flags;
1197
1198         hso_dbg(0x8, "--- Got serial_read_bulk callback %02x ---\n", status);
1199
1200         /* sanity check */
1201         if (!serial) {
1202                 hso_dbg(0x1, "serial == NULL\n");
1203                 return;
1204         }
1205         if (status) {
1206                 handle_usb_error(status, __func__, serial->parent);
1207                 return;
1208         }
1209
1210         hso_dbg(0x1, "Actual length = %d\n", urb->actual_length);
1211         DUMP1(urb->transfer_buffer, urb->actual_length);
1212
1213         /* Anyone listening? */
1214         if (serial->port.count == 0)
1215                 return;
1216
1217         if (serial->parent->port_spec & HSO_INFO_CRC_BUG)
1218                 fix_crc_bug(urb, serial->in_endp->wMaxPacketSize);
1219         /* Valid data, handle RX data */
1220         spin_lock_irqsave(&serial->serial_lock, flags);
1221         serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 1;
1222         put_rxbuf_data_and_resubmit_bulk_urb(serial);
1223         spin_unlock_irqrestore(&serial->serial_lock, flags);
1224 }
1225
1226 /*
1227  * This needs to be a tasklet otherwise we will
1228  * end up recursively calling this function.
1229  */
1230 static void hso_unthrottle_tasklet(struct hso_serial *serial)
1231 {
1232         unsigned long flags;
1233
1234         spin_lock_irqsave(&serial->serial_lock, flags);
1235         if ((serial->parent->port_spec & HSO_INTF_MUX))
1236                 put_rxbuf_data_and_resubmit_ctrl_urb(serial);
1237         else
1238                 put_rxbuf_data_and_resubmit_bulk_urb(serial);
1239         spin_unlock_irqrestore(&serial->serial_lock, flags);
1240 }
1241
1242 static  void hso_unthrottle(struct tty_struct *tty)
1243 {
1244         struct hso_serial *serial = tty->driver_data;
1245
1246         tasklet_hi_schedule(&serial->unthrottle_tasklet);
1247 }
1248
1249 /* open the requested serial port */
1250 static int hso_serial_open(struct tty_struct *tty, struct file *filp)
1251 {
1252         struct hso_serial *serial = get_serial_by_index(tty->index);
1253         int result;
1254
1255         /* sanity check */
1256         if (serial == NULL || serial->magic != HSO_SERIAL_MAGIC) {
1257                 WARN_ON(1);
1258                 tty->driver_data = NULL;
1259                 hso_dbg(0x1, "Failed to open port\n");
1260                 return -ENODEV;
1261         }
1262
1263         mutex_lock(&serial->parent->mutex);
1264         result = usb_autopm_get_interface(serial->parent->interface);
1265         if (result < 0)
1266                 goto err_out;
1267
1268         hso_dbg(0x1, "Opening %d\n", serial->minor);
1269
1270         /* setup */
1271         tty->driver_data = serial;
1272         tty_port_tty_set(&serial->port, tty);
1273
1274         /* check for port already opened, if not set the termios */
1275         serial->port.count++;
1276         if (serial->port.count == 1) {
1277                 serial->rx_state = RX_IDLE;
1278                 /* Force default termio settings */
1279                 _hso_serial_set_termios(tty, NULL);
1280                 tasklet_init(&serial->unthrottle_tasklet,
1281                              (void (*)(unsigned long))hso_unthrottle_tasklet,
1282                              (unsigned long)serial);
1283                 result = hso_start_serial_device(serial->parent, GFP_KERNEL);
1284                 if (result) {
1285                         hso_stop_serial_device(serial->parent);
1286                         serial->port.count--;
1287                 } else {
1288                         kref_get(&serial->parent->ref);
1289                 }
1290         } else {
1291                 hso_dbg(0x1, "Port was already open\n");
1292         }
1293
1294         usb_autopm_put_interface(serial->parent->interface);
1295
1296         /* done */
1297         if (result)
1298                 hso_serial_tiocmset(tty, TIOCM_RTS | TIOCM_DTR, 0);
1299 err_out:
1300         mutex_unlock(&serial->parent->mutex);
1301         return result;
1302 }
1303
1304 /* close the requested serial port */
1305 static void hso_serial_close(struct tty_struct *tty, struct file *filp)
1306 {
1307         struct hso_serial *serial = tty->driver_data;
1308         u8 usb_gone;
1309
1310         hso_dbg(0x1, "Closing serial port\n");
1311
1312         /* Open failed, no close cleanup required */
1313         if (serial == NULL)
1314                 return;
1315
1316         mutex_lock(&serial->parent->mutex);
1317         usb_gone = serial->parent->usb_gone;
1318
1319         if (!usb_gone)
1320                 usb_autopm_get_interface(serial->parent->interface);
1321
1322         /* reset the rts and dtr */
1323         /* do the actual close */
1324         serial->port.count--;
1325
1326         if (serial->port.count <= 0) {
1327                 serial->port.count = 0;
1328                 tty_port_tty_set(&serial->port, NULL);
1329                 if (!usb_gone)
1330                         hso_stop_serial_device(serial->parent);
1331                 tasklet_kill(&serial->unthrottle_tasklet);
1332         }
1333
1334         if (!usb_gone)
1335                 usb_autopm_put_interface(serial->parent->interface);
1336
1337         mutex_unlock(&serial->parent->mutex);
1338 }
1339
1340 /* close the requested serial port */
1341 static int hso_serial_write(struct tty_struct *tty, const unsigned char *buf,
1342                             int count)
1343 {
1344         struct hso_serial *serial = tty->driver_data;
1345         int space, tx_bytes;
1346         unsigned long flags;
1347
1348         /* sanity check */
1349         if (serial == NULL) {
1350                 pr_err("%s: serial is NULL\n", __func__);
1351                 return -ENODEV;
1352         }
1353
1354         spin_lock_irqsave(&serial->serial_lock, flags);
1355
1356         space = serial->tx_data_length - serial->tx_buffer_count;
1357         tx_bytes = (count < space) ? count : space;
1358
1359         if (!tx_bytes)
1360                 goto out;
1361
1362         memcpy(serial->tx_buffer + serial->tx_buffer_count, buf, tx_bytes);
1363         serial->tx_buffer_count += tx_bytes;
1364
1365 out:
1366         spin_unlock_irqrestore(&serial->serial_lock, flags);
1367
1368         hso_kick_transmit(serial);
1369         /* done */
1370         return tx_bytes;
1371 }
1372
1373 /* how much room is there for writing */
1374 static int hso_serial_write_room(struct tty_struct *tty)
1375 {
1376         struct hso_serial *serial = tty->driver_data;
1377         int room;
1378         unsigned long flags;
1379
1380         spin_lock_irqsave(&serial->serial_lock, flags);
1381         room = serial->tx_data_length - serial->tx_buffer_count;
1382         spin_unlock_irqrestore(&serial->serial_lock, flags);
1383
1384         /* return free room */
1385         return room;
1386 }
1387
1388 static void hso_serial_cleanup(struct tty_struct *tty)
1389 {
1390         struct hso_serial *serial = tty->driver_data;
1391
1392         if (!serial)
1393                 return;
1394
1395         kref_put(&serial->parent->ref, hso_serial_ref_free);
1396 }
1397
1398 /* setup the term */
1399 static void hso_serial_set_termios(struct tty_struct *tty, struct ktermios *old)
1400 {
1401         struct hso_serial *serial = tty->driver_data;
1402         unsigned long flags;
1403
1404         if (old)
1405                 hso_dbg(0x16, "Termios called with: cflags new[%u] - old[%u]\n",
1406                         (unsigned int)tty->termios.c_cflag,
1407                         (unsigned int)old->c_cflag);
1408
1409         /* the actual setup */
1410         spin_lock_irqsave(&serial->serial_lock, flags);
1411         if (serial->port.count)
1412                 _hso_serial_set_termios(tty, old);
1413         else
1414                 tty->termios = *old;
1415         spin_unlock_irqrestore(&serial->serial_lock, flags);
1416
1417         /* done */
1418 }
1419
1420 /* how many characters in the buffer */
1421 static int hso_serial_chars_in_buffer(struct tty_struct *tty)
1422 {
1423         struct hso_serial *serial = tty->driver_data;
1424         int chars;
1425         unsigned long flags;
1426
1427         /* sanity check */
1428         if (serial == NULL)
1429                 return 0;
1430
1431         spin_lock_irqsave(&serial->serial_lock, flags);
1432         chars = serial->tx_buffer_count;
1433         spin_unlock_irqrestore(&serial->serial_lock, flags);
1434
1435         return chars;
1436 }
1437 static int tiocmget_submit_urb(struct hso_serial *serial,
1438                                struct hso_tiocmget *tiocmget,
1439                                struct usb_device *usb)
1440 {
1441         int result;
1442
1443         if (serial->parent->usb_gone)
1444                 return -ENODEV;
1445         usb_fill_int_urb(tiocmget->urb, usb,
1446                          usb_rcvintpipe(usb,
1447                                         tiocmget->endp->
1448                                         bEndpointAddress & 0x7F),
1449                          &tiocmget->serial_state_notification,
1450                          sizeof(struct hso_serial_state_notification),
1451                          tiocmget_intr_callback, serial,
1452                          tiocmget->endp->bInterval);
1453         result = usb_submit_urb(tiocmget->urb, GFP_ATOMIC);
1454         if (result) {
1455                 dev_warn(&usb->dev, "%s usb_submit_urb failed %d\n", __func__,
1456                          result);
1457         }
1458         return result;
1459
1460 }
1461
1462 static void tiocmget_intr_callback(struct urb *urb)
1463 {
1464         struct hso_serial *serial = urb->context;
1465         struct hso_tiocmget *tiocmget;
1466         int status = urb->status;
1467         u16 UART_state_bitmap, prev_UART_state_bitmap;
1468         struct uart_icount *icount;
1469         struct hso_serial_state_notification *serial_state_notification;
1470         struct usb_device *usb;
1471         struct usb_interface *interface;
1472         int if_num;
1473
1474         /* Sanity checks */
1475         if (!serial)
1476                 return;
1477         if (status) {
1478                 handle_usb_error(status, __func__, serial->parent);
1479                 return;
1480         }
1481
1482         /* tiocmget is only supported on HSO_PORT_MODEM */
1483         tiocmget = serial->tiocmget;
1484         if (!tiocmget)
1485                 return;
1486         BUG_ON((serial->parent->port_spec & HSO_PORT_MASK) != HSO_PORT_MODEM);
1487
1488         usb = serial->parent->usb;
1489         interface = serial->parent->interface;
1490
1491         if_num = interface->cur_altsetting->desc.bInterfaceNumber;
1492
1493         /* wIndex should be the USB interface number of the port to which the
1494          * notification applies, which should always be the Modem port.
1495          */
1496         serial_state_notification = &tiocmget->serial_state_notification;
1497         if (serial_state_notification->bmRequestType != BM_REQUEST_TYPE ||
1498             serial_state_notification->bNotification != B_NOTIFICATION ||
1499             le16_to_cpu(serial_state_notification->wValue) != W_VALUE ||
1500             le16_to_cpu(serial_state_notification->wIndex) != if_num ||
1501             le16_to_cpu(serial_state_notification->wLength) != W_LENGTH) {
1502                 dev_warn(&usb->dev,
1503                          "hso received invalid serial state notification\n");
1504                 DUMP(serial_state_notification,
1505                      sizeof(struct hso_serial_state_notification));
1506         } else {
1507                 unsigned long flags;
1508
1509                 UART_state_bitmap = le16_to_cpu(serial_state_notification->
1510                                                 UART_state_bitmap);
1511                 prev_UART_state_bitmap = tiocmget->prev_UART_state_bitmap;
1512                 icount = &tiocmget->icount;
1513                 spin_lock_irqsave(&serial->serial_lock, flags);
1514                 if ((UART_state_bitmap & B_OVERRUN) !=
1515                    (prev_UART_state_bitmap & B_OVERRUN))
1516                         icount->parity++;
1517                 if ((UART_state_bitmap & B_PARITY) !=
1518                    (prev_UART_state_bitmap & B_PARITY))
1519                         icount->parity++;
1520                 if ((UART_state_bitmap & B_FRAMING) !=
1521                    (prev_UART_state_bitmap & B_FRAMING))
1522                         icount->frame++;
1523                 if ((UART_state_bitmap & B_RING_SIGNAL) &&
1524                    !(prev_UART_state_bitmap & B_RING_SIGNAL))
1525                         icount->rng++;
1526                 if ((UART_state_bitmap & B_BREAK) !=
1527                    (prev_UART_state_bitmap & B_BREAK))
1528                         icount->brk++;
1529                 if ((UART_state_bitmap & B_TX_CARRIER) !=
1530                    (prev_UART_state_bitmap & B_TX_CARRIER))
1531                         icount->dsr++;
1532                 if ((UART_state_bitmap & B_RX_CARRIER) !=
1533                    (prev_UART_state_bitmap & B_RX_CARRIER))
1534                         icount->dcd++;
1535                 tiocmget->prev_UART_state_bitmap = UART_state_bitmap;
1536                 spin_unlock_irqrestore(&serial->serial_lock, flags);
1537                 tiocmget->intr_completed = 1;
1538                 wake_up_interruptible(&tiocmget->waitq);
1539         }
1540         memset(serial_state_notification, 0,
1541                sizeof(struct hso_serial_state_notification));
1542         tiocmget_submit_urb(serial,
1543                             tiocmget,
1544                             serial->parent->usb);
1545 }
1546
1547 /*
1548  * next few functions largely stolen from drivers/serial/serial_core.c
1549  */
1550 /* Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1551  * - mask passed in arg for lines of interest
1552  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1553  * Caller should use TIOCGICOUNT to see which one it was
1554  */
1555 static int
1556 hso_wait_modem_status(struct hso_serial *serial, unsigned long arg)
1557 {
1558         DECLARE_WAITQUEUE(wait, current);
1559         struct uart_icount cprev, cnow;
1560         struct hso_tiocmget  *tiocmget;
1561         int ret;
1562
1563         tiocmget = serial->tiocmget;
1564         if (!tiocmget)
1565                 return -ENOENT;
1566         /*
1567          * note the counters on entry
1568          */
1569         spin_lock_irq(&serial->serial_lock);
1570         memcpy(&cprev, &tiocmget->icount, sizeof(struct uart_icount));
1571         spin_unlock_irq(&serial->serial_lock);
1572         add_wait_queue(&tiocmget->waitq, &wait);
1573         for (;;) {
1574                 spin_lock_irq(&serial->serial_lock);
1575                 memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
1576                 spin_unlock_irq(&serial->serial_lock);
1577                 set_current_state(TASK_INTERRUPTIBLE);
1578                 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1579                     ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1580                     ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd))) {
1581                         ret = 0;
1582                         break;
1583                 }
1584                 schedule();
1585                 /* see if a signal did it */
1586                 if (signal_pending(current)) {
1587                         ret = -ERESTARTSYS;
1588                         break;
1589                 }
1590                 cprev = cnow;
1591         }
1592         __set_current_state(TASK_RUNNING);
1593         remove_wait_queue(&tiocmget->waitq, &wait);
1594
1595         return ret;
1596 }
1597
1598 /*
1599  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1600  * Return: write counters to the user passed counter struct
1601  * NB: both 1->0 and 0->1 transitions are counted except for
1602  *     RI where only 0->1 is counted.
1603  */
1604 static int hso_get_count(struct tty_struct *tty,
1605                   struct serial_icounter_struct *icount)
1606 {
1607         struct uart_icount cnow;
1608         struct hso_serial *serial = tty->driver_data;
1609         struct hso_tiocmget  *tiocmget = serial->tiocmget;
1610
1611         memset(icount, 0, sizeof(struct serial_icounter_struct));
1612
1613         if (!tiocmget)
1614                  return -ENOENT;
1615         spin_lock_irq(&serial->serial_lock);
1616         memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
1617         spin_unlock_irq(&serial->serial_lock);
1618
1619         icount->cts         = cnow.cts;
1620         icount->dsr         = cnow.dsr;
1621         icount->rng         = cnow.rng;
1622         icount->dcd         = cnow.dcd;
1623         icount->rx          = cnow.rx;
1624         icount->tx          = cnow.tx;
1625         icount->frame       = cnow.frame;
1626         icount->overrun     = cnow.overrun;
1627         icount->parity      = cnow.parity;
1628         icount->brk         = cnow.brk;
1629         icount->buf_overrun = cnow.buf_overrun;
1630
1631         return 0;
1632 }
1633
1634
1635 static int hso_serial_tiocmget(struct tty_struct *tty)
1636 {
1637         int retval;
1638         struct hso_serial *serial = tty->driver_data;
1639         struct hso_tiocmget  *tiocmget;
1640         u16 UART_state_bitmap;
1641
1642         /* sanity check */
1643         if (!serial) {
1644                 hso_dbg(0x1, "no tty structures\n");
1645                 return -EINVAL;
1646         }
1647         spin_lock_irq(&serial->serial_lock);
1648         retval = ((serial->rts_state) ? TIOCM_RTS : 0) |
1649             ((serial->dtr_state) ? TIOCM_DTR : 0);
1650         tiocmget = serial->tiocmget;
1651         if (tiocmget) {
1652
1653                 UART_state_bitmap = le16_to_cpu(
1654                         tiocmget->prev_UART_state_bitmap);
1655                 if (UART_state_bitmap & B_RING_SIGNAL)
1656                         retval |=  TIOCM_RNG;
1657                 if (UART_state_bitmap & B_RX_CARRIER)
1658                         retval |=  TIOCM_CD;
1659                 if (UART_state_bitmap & B_TX_CARRIER)
1660                         retval |=  TIOCM_DSR;
1661         }
1662         spin_unlock_irq(&serial->serial_lock);
1663         return retval;
1664 }
1665
1666 static int hso_serial_tiocmset(struct tty_struct *tty,
1667                                unsigned int set, unsigned int clear)
1668 {
1669         int val = 0;
1670         unsigned long flags;
1671         int if_num;
1672         struct hso_serial *serial = tty->driver_data;
1673         struct usb_interface *interface;
1674
1675         /* sanity check */
1676         if (!serial) {
1677                 hso_dbg(0x1, "no tty structures\n");
1678                 return -EINVAL;
1679         }
1680
1681         if ((serial->parent->port_spec & HSO_PORT_MASK) != HSO_PORT_MODEM)
1682                 return -EINVAL;
1683
1684         interface = serial->parent->interface;
1685         if_num = interface->cur_altsetting->desc.bInterfaceNumber;
1686
1687         spin_lock_irqsave(&serial->serial_lock, flags);
1688         if (set & TIOCM_RTS)
1689                 serial->rts_state = 1;
1690         if (set & TIOCM_DTR)
1691                 serial->dtr_state = 1;
1692
1693         if (clear & TIOCM_RTS)
1694                 serial->rts_state = 0;
1695         if (clear & TIOCM_DTR)
1696                 serial->dtr_state = 0;
1697
1698         if (serial->dtr_state)
1699                 val |= 0x01;
1700         if (serial->rts_state)
1701                 val |= 0x02;
1702
1703         spin_unlock_irqrestore(&serial->serial_lock, flags);
1704
1705         return usb_control_msg(serial->parent->usb,
1706                                usb_sndctrlpipe(serial->parent->usb, 0), 0x22,
1707                                0x21, val, if_num, NULL, 0,
1708                                USB_CTRL_SET_TIMEOUT);
1709 }
1710
1711 static int hso_serial_ioctl(struct tty_struct *tty,
1712                             unsigned int cmd, unsigned long arg)
1713 {
1714         struct hso_serial *serial = tty->driver_data;
1715         int ret = 0;
1716         hso_dbg(0x8, "IOCTL cmd: %d, arg: %ld\n", cmd, arg);
1717
1718         if (!serial)
1719                 return -ENODEV;
1720         switch (cmd) {
1721         case TIOCMIWAIT:
1722                 ret = hso_wait_modem_status(serial, arg);
1723                 break;
1724         default:
1725                 ret = -ENOIOCTLCMD;
1726                 break;
1727         }
1728         return ret;
1729 }
1730
1731
1732 /* starts a transmit */
1733 static void hso_kick_transmit(struct hso_serial *serial)
1734 {
1735         unsigned long flags;
1736         int res;
1737
1738         spin_lock_irqsave(&serial->serial_lock, flags);
1739         if (!serial->tx_buffer_count)
1740                 goto out;
1741
1742         if (serial->tx_urb_used)
1743                 goto out;
1744
1745         /* Wakeup USB interface if necessary */
1746         if (hso_get_activity(serial->parent) == -EAGAIN)
1747                 goto out;
1748
1749         /* Switch pointers around to avoid memcpy */
1750         swap(serial->tx_buffer, serial->tx_data);
1751         serial->tx_data_count = serial->tx_buffer_count;
1752         serial->tx_buffer_count = 0;
1753
1754         /* If serial->tx_data is set, it means we switched buffers */
1755         if (serial->tx_data && serial->write_data) {
1756                 res = serial->write_data(serial);
1757                 if (res >= 0)
1758                         serial->tx_urb_used = 1;
1759         }
1760 out:
1761         spin_unlock_irqrestore(&serial->serial_lock, flags);
1762 }
1763
1764 /* make a request (for reading and writing data to muxed serial port) */
1765 static int mux_device_request(struct hso_serial *serial, u8 type, u16 port,
1766                               struct urb *ctrl_urb,
1767                               struct usb_ctrlrequest *ctrl_req,
1768                               u8 *ctrl_urb_data, u32 size)
1769 {
1770         int result;
1771         int pipe;
1772
1773         /* Sanity check */
1774         if (!serial || !ctrl_urb || !ctrl_req) {
1775                 pr_err("%s: Wrong arguments\n", __func__);
1776                 return -EINVAL;
1777         }
1778
1779         /* initialize */
1780         ctrl_req->wValue = 0;
1781         ctrl_req->wIndex = cpu_to_le16(hso_port_to_mux(port));
1782         ctrl_req->wLength = cpu_to_le16(size);
1783
1784         if (type == USB_CDC_GET_ENCAPSULATED_RESPONSE) {
1785                 /* Reading command */
1786                 ctrl_req->bRequestType = USB_DIR_IN |
1787                                          USB_TYPE_OPTION_VENDOR |
1788                                          USB_RECIP_INTERFACE;
1789                 ctrl_req->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE;
1790                 pipe = usb_rcvctrlpipe(serial->parent->usb, 0);
1791         } else {
1792                 /* Writing command */
1793                 ctrl_req->bRequestType = USB_DIR_OUT |
1794                                          USB_TYPE_OPTION_VENDOR |
1795                                          USB_RECIP_INTERFACE;
1796                 ctrl_req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND;
1797                 pipe = usb_sndctrlpipe(serial->parent->usb, 0);
1798         }
1799         /* syslog */
1800         hso_dbg(0x2, "%s command (%02x) len: %d, port: %d\n",
1801                 type == USB_CDC_GET_ENCAPSULATED_RESPONSE ? "Read" : "Write",
1802                 ctrl_req->bRequestType, ctrl_req->wLength, port);
1803
1804         /* Load ctrl urb */
1805         ctrl_urb->transfer_flags = 0;
1806         usb_fill_control_urb(ctrl_urb,
1807                              serial->parent->usb,
1808                              pipe,
1809                              (u8 *) ctrl_req,
1810                              ctrl_urb_data, size, ctrl_callback, serial);
1811         /* Send it on merry way */
1812         result = usb_submit_urb(ctrl_urb, GFP_ATOMIC);
1813         if (result) {
1814                 dev_err(&ctrl_urb->dev->dev,
1815                         "%s failed submit ctrl_urb %d type %d\n", __func__,
1816                         result, type);
1817                 return result;
1818         }
1819
1820         /* done */
1821         return size;
1822 }
1823
1824 /* called by intr_callback when read occurs */
1825 static int hso_mux_serial_read(struct hso_serial *serial)
1826 {
1827         if (!serial)
1828                 return -EINVAL;
1829
1830         /* clean data */
1831         memset(serial->rx_data[0], 0, CTRL_URB_RX_SIZE);
1832         /* make the request */
1833
1834         if (serial->num_rx_urbs != 1) {
1835                 dev_err(&serial->parent->interface->dev,
1836                         "ERROR: mux'd reads with multiple buffers "
1837                         "not possible\n");
1838                 return 0;
1839         }
1840         return mux_device_request(serial,
1841                                   USB_CDC_GET_ENCAPSULATED_RESPONSE,
1842                                   serial->parent->port_spec & HSO_PORT_MASK,
1843                                   serial->rx_urb[0],
1844                                   &serial->ctrl_req_rx,
1845                                   serial->rx_data[0], serial->rx_data_length);
1846 }
1847
1848 /* used for muxed serial port callback (muxed serial read) */
1849 static void intr_callback(struct urb *urb)
1850 {
1851         struct hso_shared_int *shared_int = urb->context;
1852         struct hso_serial *serial;
1853         unsigned char *port_req;
1854         int status = urb->status;
1855         unsigned long flags;
1856         int i;
1857
1858         usb_mark_last_busy(urb->dev);
1859
1860         /* sanity check */
1861         if (!shared_int)
1862                 return;
1863
1864         /* status check */
1865         if (status) {
1866                 handle_usb_error(status, __func__, NULL);
1867                 return;
1868         }
1869         hso_dbg(0x8, "--- Got intr callback 0x%02X ---\n", status);
1870
1871         /* what request? */
1872         port_req = urb->transfer_buffer;
1873         hso_dbg(0x8, "port_req = 0x%.2X\n", *port_req);
1874         /* loop over all muxed ports to find the one sending this */
1875         for (i = 0; i < 8; i++) {
1876                 /* max 8 channels on MUX */
1877                 if (*port_req & (1 << i)) {
1878                         serial = get_serial_by_shared_int_and_type(shared_int,
1879                                                                    (1 << i));
1880                         if (serial != NULL) {
1881                                 hso_dbg(0x1, "Pending read interrupt on port %d\n",
1882                                         i);
1883                                 spin_lock_irqsave(&serial->serial_lock, flags);
1884                                 if (serial->rx_state == RX_IDLE &&
1885                                         serial->port.count > 0) {
1886                                         /* Setup and send a ctrl req read on
1887                                          * port i */
1888                                         if (!serial->rx_urb_filled[0]) {
1889                                                 serial->rx_state = RX_SENT;
1890                                                 hso_mux_serial_read(serial);
1891                                         } else
1892                                                 serial->rx_state = RX_PENDING;
1893                                 } else {
1894                                         hso_dbg(0x1, "Already a read pending on port %d or port not open\n",
1895                                                 i);
1896                                 }
1897                                 spin_unlock_irqrestore(&serial->serial_lock,
1898                                                        flags);
1899                         }
1900                 }
1901         }
1902         /* Resubmit interrupt urb */
1903         hso_mux_submit_intr_urb(shared_int, urb->dev, GFP_ATOMIC);
1904 }
1905
1906 /* called for writing to muxed serial port */
1907 static int hso_mux_serial_write_data(struct hso_serial *serial)
1908 {
1909         if (NULL == serial)
1910                 return -EINVAL;
1911
1912         return mux_device_request(serial,
1913                                   USB_CDC_SEND_ENCAPSULATED_COMMAND,
1914                                   serial->parent->port_spec & HSO_PORT_MASK,
1915                                   serial->tx_urb,
1916                                   &serial->ctrl_req_tx,
1917                                   serial->tx_data, serial->tx_data_count);
1918 }
1919
1920 /* write callback for Diag and CS port */
1921 static void hso_std_serial_write_bulk_callback(struct urb *urb)
1922 {
1923         struct hso_serial *serial = urb->context;
1924         int status = urb->status;
1925         unsigned long flags;
1926
1927         /* sanity check */
1928         if (!serial) {
1929                 hso_dbg(0x1, "serial == NULL\n");
1930                 return;
1931         }
1932
1933         spin_lock_irqsave(&serial->serial_lock, flags);
1934         serial->tx_urb_used = 0;
1935         spin_unlock_irqrestore(&serial->serial_lock, flags);
1936         if (status) {
1937                 handle_usb_error(status, __func__, serial->parent);
1938                 return;
1939         }
1940         hso_put_activity(serial->parent);
1941         tty_port_tty_wakeup(&serial->port);
1942         hso_kick_transmit(serial);
1943
1944         hso_dbg(0x1, "\n");
1945 }
1946
1947 /* called for writing diag or CS serial port */
1948 static int hso_std_serial_write_data(struct hso_serial *serial)
1949 {
1950         int count = serial->tx_data_count;
1951         int result;
1952
1953         usb_fill_bulk_urb(serial->tx_urb,
1954                           serial->parent->usb,
1955                           usb_sndbulkpipe(serial->parent->usb,
1956                                           serial->out_endp->
1957                                           bEndpointAddress & 0x7F),
1958                           serial->tx_data, serial->tx_data_count,
1959                           hso_std_serial_write_bulk_callback, serial);
1960
1961         result = usb_submit_urb(serial->tx_urb, GFP_ATOMIC);
1962         if (result) {
1963                 dev_warn(&serial->parent->usb->dev,
1964                          "Failed to submit urb - res %d\n", result);
1965                 return result;
1966         }
1967
1968         return count;
1969 }
1970
1971 /* callback after read or write on muxed serial port */
1972 static void ctrl_callback(struct urb *urb)
1973 {
1974         struct hso_serial *serial = urb->context;
1975         struct usb_ctrlrequest *req;
1976         int status = urb->status;
1977         unsigned long flags;
1978
1979         /* sanity check */
1980         if (!serial)
1981                 return;
1982
1983         spin_lock_irqsave(&serial->serial_lock, flags);
1984         serial->tx_urb_used = 0;
1985         spin_unlock_irqrestore(&serial->serial_lock, flags);
1986         if (status) {
1987                 handle_usb_error(status, __func__, serial->parent);
1988                 return;
1989         }
1990
1991         /* what request? */
1992         req = (struct usb_ctrlrequest *)(urb->setup_packet);
1993         hso_dbg(0x8, "--- Got muxed ctrl callback 0x%02X ---\n", status);
1994         hso_dbg(0x8, "Actual length of urb = %d\n", urb->actual_length);
1995         DUMP1(urb->transfer_buffer, urb->actual_length);
1996
1997         if (req->bRequestType ==
1998             (USB_DIR_IN | USB_TYPE_OPTION_VENDOR | USB_RECIP_INTERFACE)) {
1999                 /* response to a read command */
2000                 serial->rx_urb_filled[0] = 1;
2001                 spin_lock_irqsave(&serial->serial_lock, flags);
2002                 put_rxbuf_data_and_resubmit_ctrl_urb(serial);
2003                 spin_unlock_irqrestore(&serial->serial_lock, flags);
2004         } else {
2005                 hso_put_activity(serial->parent);
2006                 tty_port_tty_wakeup(&serial->port);
2007                 /* response to a write command */
2008                 hso_kick_transmit(serial);
2009         }
2010 }
2011
2012 /* handle RX data for serial port */
2013 static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial)
2014 {
2015         struct tty_struct *tty;
2016         int count;
2017
2018         /* Sanity check */
2019         if (urb == NULL || serial == NULL) {
2020                 hso_dbg(0x1, "serial = NULL\n");
2021                 return -2;
2022         }
2023
2024         tty = tty_port_tty_get(&serial->port);
2025
2026         if (tty && tty_throttled(tty)) {
2027                 tty_kref_put(tty);
2028                 return -1;
2029         }
2030
2031         /* Push data to tty */
2032         hso_dbg(0x1, "data to push to tty\n");
2033         count = tty_buffer_request_room(&serial->port, urb->actual_length);
2034         if (count >= urb->actual_length) {
2035                 tty_insert_flip_string(&serial->port, urb->transfer_buffer,
2036                                        urb->actual_length);
2037                 tty_flip_buffer_push(&serial->port);
2038         } else {
2039                 dev_warn(&serial->parent->usb->dev,
2040                          "dropping data, %d bytes lost\n", urb->actual_length);
2041         }
2042
2043         tty_kref_put(tty);
2044
2045         serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 0;
2046
2047         return 0;
2048 }
2049
2050
2051 /* Base driver functions */
2052
2053 static void hso_log_port(struct hso_device *hso_dev)
2054 {
2055         char *port_type;
2056         char port_dev[20];
2057
2058         switch (hso_dev->port_spec & HSO_PORT_MASK) {
2059         case HSO_PORT_CONTROL:
2060                 port_type = "Control";
2061                 break;
2062         case HSO_PORT_APP:
2063                 port_type = "Application";
2064                 break;
2065         case HSO_PORT_GPS:
2066                 port_type = "GPS";
2067                 break;
2068         case HSO_PORT_GPS_CONTROL:
2069                 port_type = "GPS control";
2070                 break;
2071         case HSO_PORT_APP2:
2072                 port_type = "Application2";
2073                 break;
2074         case HSO_PORT_PCSC:
2075                 port_type = "PCSC";
2076                 break;
2077         case HSO_PORT_DIAG:
2078                 port_type = "Diagnostic";
2079                 break;
2080         case HSO_PORT_DIAG2:
2081                 port_type = "Diagnostic2";
2082                 break;
2083         case HSO_PORT_MODEM:
2084                 port_type = "Modem";
2085                 break;
2086         case HSO_PORT_NETWORK:
2087                 port_type = "Network";
2088                 break;
2089         default:
2090                 port_type = "Unknown";
2091                 break;
2092         }
2093         if ((hso_dev->port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2094                 sprintf(port_dev, "%s", dev2net(hso_dev)->net->name);
2095         } else
2096                 sprintf(port_dev, "/dev/%s%d", tty_filename,
2097                         dev2ser(hso_dev)->minor);
2098
2099         dev_dbg(&hso_dev->interface->dev, "HSO: Found %s port %s\n",
2100                 port_type, port_dev);
2101 }
2102
2103 static int hso_start_net_device(struct hso_device *hso_dev)
2104 {
2105         int i, result = 0;
2106         struct hso_net *hso_net = dev2net(hso_dev);
2107
2108         if (!hso_net)
2109                 return -ENODEV;
2110
2111         /* send URBs for all read buffers */
2112         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2113
2114                 /* Prep a receive URB */
2115                 usb_fill_bulk_urb(hso_net->mux_bulk_rx_urb_pool[i],
2116                                   hso_dev->usb,
2117                                   usb_rcvbulkpipe(hso_dev->usb,
2118                                                   hso_net->in_endp->
2119                                                   bEndpointAddress & 0x7F),
2120                                   hso_net->mux_bulk_rx_buf_pool[i],
2121                                   MUX_BULK_RX_BUF_SIZE, read_bulk_callback,
2122                                   hso_net);
2123
2124                 /* Put it out there so the device can send us stuff */
2125                 result = usb_submit_urb(hso_net->mux_bulk_rx_urb_pool[i],
2126                                         GFP_NOIO);
2127                 if (result)
2128                         dev_warn(&hso_dev->usb->dev,
2129                                 "%s failed mux_bulk_rx_urb[%d] %d\n", __func__,
2130                                 i, result);
2131         }
2132
2133         return result;
2134 }
2135
2136 static int hso_stop_net_device(struct hso_device *hso_dev)
2137 {
2138         int i;
2139         struct hso_net *hso_net = dev2net(hso_dev);
2140
2141         if (!hso_net)
2142                 return -ENODEV;
2143
2144         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2145                 if (hso_net->mux_bulk_rx_urb_pool[i])
2146                         usb_kill_urb(hso_net->mux_bulk_rx_urb_pool[i]);
2147
2148         }
2149         if (hso_net->mux_bulk_tx_urb)
2150                 usb_kill_urb(hso_net->mux_bulk_tx_urb);
2151
2152         return 0;
2153 }
2154
2155 static int hso_start_serial_device(struct hso_device *hso_dev, gfp_t flags)
2156 {
2157         int i, result = 0;
2158         struct hso_serial *serial = dev2ser(hso_dev);
2159
2160         if (!serial)
2161                 return -ENODEV;
2162
2163         /* If it is not the MUX port fill in and submit a bulk urb (already
2164          * allocated in hso_serial_start) */
2165         if (!(serial->parent->port_spec & HSO_INTF_MUX)) {
2166                 for (i = 0; i < serial->num_rx_urbs; i++) {
2167                         usb_fill_bulk_urb(serial->rx_urb[i],
2168                                           serial->parent->usb,
2169                                           usb_rcvbulkpipe(serial->parent->usb,
2170                                                           serial->in_endp->
2171                                                           bEndpointAddress &
2172                                                           0x7F),
2173                                           serial->rx_data[i],
2174                                           serial->rx_data_length,
2175                                           hso_std_serial_read_bulk_callback,
2176                                           serial);
2177                         result = usb_submit_urb(serial->rx_urb[i], flags);
2178                         if (result) {
2179                                 dev_warn(&serial->parent->usb->dev,
2180                                          "Failed to submit urb - res %d\n",
2181                                          result);
2182                                 break;
2183                         }
2184                 }
2185         } else {
2186                 mutex_lock(&serial->shared_int->shared_int_lock);
2187                 if (!serial->shared_int->use_count) {
2188                         result =
2189                             hso_mux_submit_intr_urb(serial->shared_int,
2190                                                     hso_dev->usb, flags);
2191                 }
2192                 serial->shared_int->use_count++;
2193                 mutex_unlock(&serial->shared_int->shared_int_lock);
2194         }
2195         if (serial->tiocmget)
2196                 tiocmget_submit_urb(serial,
2197                                     serial->tiocmget,
2198                                     serial->parent->usb);
2199         return result;
2200 }
2201
2202 static int hso_stop_serial_device(struct hso_device *hso_dev)
2203 {
2204         int i;
2205         struct hso_serial *serial = dev2ser(hso_dev);
2206         struct hso_tiocmget  *tiocmget;
2207
2208         if (!serial)
2209                 return -ENODEV;
2210
2211         for (i = 0; i < serial->num_rx_urbs; i++) {
2212                 if (serial->rx_urb[i]) {
2213                         usb_kill_urb(serial->rx_urb[i]);
2214                         serial->rx_urb_filled[i] = 0;
2215                 }
2216         }
2217         serial->curr_rx_urb_idx = 0;
2218
2219         if (serial->tx_urb)
2220                 usb_kill_urb(serial->tx_urb);
2221
2222         if (serial->shared_int) {
2223                 mutex_lock(&serial->shared_int->shared_int_lock);
2224                 if (serial->shared_int->use_count &&
2225                     (--serial->shared_int->use_count == 0)) {
2226                         struct urb *urb;
2227
2228                         urb = serial->shared_int->shared_intr_urb;
2229                         if (urb)
2230                                 usb_kill_urb(urb);
2231                 }
2232                 mutex_unlock(&serial->shared_int->shared_int_lock);
2233         }
2234         tiocmget = serial->tiocmget;
2235         if (tiocmget) {
2236                 wake_up_interruptible(&tiocmget->waitq);
2237                 usb_kill_urb(tiocmget->urb);
2238         }
2239
2240         return 0;
2241 }
2242
2243 static void hso_serial_tty_unregister(struct hso_serial *serial)
2244 {
2245         tty_unregister_device(tty_drv, serial->minor);
2246         release_minor(serial);
2247 }
2248
2249 static void hso_serial_common_free(struct hso_serial *serial)
2250 {
2251         int i;
2252
2253         for (i = 0; i < serial->num_rx_urbs; i++) {
2254                 /* unlink and free RX URB */
2255                 usb_free_urb(serial->rx_urb[i]);
2256                 /* free the RX buffer */
2257                 kfree(serial->rx_data[i]);
2258         }
2259
2260         /* unlink and free TX URB */
2261         usb_free_urb(serial->tx_urb);
2262         kfree(serial->tx_buffer);
2263         kfree(serial->tx_data);
2264         tty_port_destroy(&serial->port);
2265 }
2266
2267 static int hso_serial_common_create(struct hso_serial *serial, int num_urbs,
2268                                     int rx_size, int tx_size)
2269 {
2270         int i;
2271
2272         tty_port_init(&serial->port);
2273
2274         if (obtain_minor(serial))
2275                 goto exit2;
2276
2277         /* register our minor number */
2278         serial->parent->dev = tty_port_register_device_attr(&serial->port,
2279                         tty_drv, serial->minor, &serial->parent->interface->dev,
2280                         serial->parent, hso_serial_dev_groups);
2281         if (IS_ERR(serial->parent->dev)) {
2282                 release_minor(serial);
2283                 goto exit2;
2284         }
2285
2286         serial->magic = HSO_SERIAL_MAGIC;
2287         spin_lock_init(&serial->serial_lock);
2288         serial->num_rx_urbs = num_urbs;
2289
2290         /* RX, allocate urb and initialize */
2291
2292         /* prepare our RX buffer */
2293         serial->rx_data_length = rx_size;
2294         for (i = 0; i < serial->num_rx_urbs; i++) {
2295                 serial->rx_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
2296                 if (!serial->rx_urb[i])
2297                         goto exit;
2298                 serial->rx_urb[i]->transfer_buffer = NULL;
2299                 serial->rx_urb[i]->transfer_buffer_length = 0;
2300                 serial->rx_data[i] = kzalloc(serial->rx_data_length,
2301                                              GFP_KERNEL);
2302                 if (!serial->rx_data[i])
2303                         goto exit;
2304         }
2305
2306         /* TX, allocate urb and initialize */
2307         serial->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
2308         if (!serial->tx_urb)
2309                 goto exit;
2310         serial->tx_urb->transfer_buffer = NULL;
2311         serial->tx_urb->transfer_buffer_length = 0;
2312         /* prepare our TX buffer */
2313         serial->tx_data_count = 0;
2314         serial->tx_buffer_count = 0;
2315         serial->tx_data_length = tx_size;
2316         serial->tx_data = kzalloc(serial->tx_data_length, GFP_KERNEL);
2317         if (!serial->tx_data)
2318                 goto exit;
2319
2320         serial->tx_buffer = kzalloc(serial->tx_data_length, GFP_KERNEL);
2321         if (!serial->tx_buffer)
2322                 goto exit;
2323
2324         return 0;
2325 exit:
2326         hso_serial_tty_unregister(serial);
2327 exit2:
2328         hso_serial_common_free(serial);
2329         return -1;
2330 }
2331
2332 /* Creates a general hso device */
2333 static struct hso_device *hso_create_device(struct usb_interface *intf,
2334                                             int port_spec)
2335 {
2336         struct hso_device *hso_dev;
2337
2338         hso_dev = kzalloc(sizeof(*hso_dev), GFP_ATOMIC);
2339         if (!hso_dev)
2340                 return NULL;
2341
2342         hso_dev->port_spec = port_spec;
2343         hso_dev->usb = interface_to_usbdev(intf);
2344         hso_dev->interface = intf;
2345         kref_init(&hso_dev->ref);
2346         mutex_init(&hso_dev->mutex);
2347
2348         INIT_WORK(&hso_dev->async_get_intf, async_get_intf);
2349         INIT_WORK(&hso_dev->async_put_intf, async_put_intf);
2350
2351         return hso_dev;
2352 }
2353
2354 /* Removes a network device in the network device table */
2355 static int remove_net_device(struct hso_device *hso_dev)
2356 {
2357         int i;
2358
2359         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
2360                 if (network_table[i] == hso_dev) {
2361                         network_table[i] = NULL;
2362                         break;
2363                 }
2364         }
2365         if (i == HSO_MAX_NET_DEVICES)
2366                 return -1;
2367         return 0;
2368 }
2369
2370 /* Frees our network device */
2371 static void hso_free_net_device(struct hso_device *hso_dev)
2372 {
2373         int i;
2374         struct hso_net *hso_net = dev2net(hso_dev);
2375
2376         if (!hso_net)
2377                 return;
2378
2379         remove_net_device(hso_net->parent);
2380
2381         if (hso_net->net)
2382                 unregister_netdev(hso_net->net);
2383
2384         /* start freeing */
2385         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2386                 usb_free_urb(hso_net->mux_bulk_rx_urb_pool[i]);
2387                 kfree(hso_net->mux_bulk_rx_buf_pool[i]);
2388                 hso_net->mux_bulk_rx_buf_pool[i] = NULL;
2389         }
2390         usb_free_urb(hso_net->mux_bulk_tx_urb);
2391         kfree(hso_net->mux_bulk_tx_buf);
2392         hso_net->mux_bulk_tx_buf = NULL;
2393
2394         if (hso_net->net)
2395                 free_netdev(hso_net->net);
2396
2397         kfree(hso_dev);
2398 }
2399
2400 static const struct net_device_ops hso_netdev_ops = {
2401         .ndo_open       = hso_net_open,
2402         .ndo_stop       = hso_net_close,
2403         .ndo_start_xmit = hso_net_start_xmit,
2404         .ndo_tx_timeout = hso_net_tx_timeout,
2405 };
2406
2407 /* initialize the network interface */
2408 static void hso_net_init(struct net_device *net)
2409 {
2410         struct hso_net *hso_net = netdev_priv(net);
2411
2412         hso_dbg(0x1, "sizeof hso_net is %zu\n", sizeof(*hso_net));
2413
2414         /* fill in the other fields */
2415         net->netdev_ops = &hso_netdev_ops;
2416         net->watchdog_timeo = HSO_NET_TX_TIMEOUT;
2417         net->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2418         net->type = ARPHRD_NONE;
2419         net->mtu = DEFAULT_MTU - 14;
2420         net->tx_queue_len = 10;
2421         net->ethtool_ops = &ops;
2422
2423         /* and initialize the semaphore */
2424         spin_lock_init(&hso_net->net_lock);
2425 }
2426
2427 /* Adds a network device in the network device table */
2428 static int add_net_device(struct hso_device *hso_dev)
2429 {
2430         int i;
2431
2432         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
2433                 if (network_table[i] == NULL) {
2434                         network_table[i] = hso_dev;
2435                         break;
2436                 }
2437         }
2438         if (i == HSO_MAX_NET_DEVICES)
2439                 return -1;
2440         return 0;
2441 }
2442
2443 static int hso_rfkill_set_block(void *data, bool blocked)
2444 {
2445         struct hso_device *hso_dev = data;
2446         int enabled = !blocked;
2447         int rv;
2448
2449         mutex_lock(&hso_dev->mutex);
2450         if (hso_dev->usb_gone)
2451                 rv = 0;
2452         else
2453                 rv = usb_control_msg(hso_dev->usb, usb_sndctrlpipe(hso_dev->usb, 0),
2454                                        enabled ? 0x82 : 0x81, 0x40, 0, 0, NULL, 0,
2455                                        USB_CTRL_SET_TIMEOUT);
2456         mutex_unlock(&hso_dev->mutex);
2457         return rv;
2458 }
2459
2460 static const struct rfkill_ops hso_rfkill_ops = {
2461         .set_block = hso_rfkill_set_block,
2462 };
2463
2464 /* Creates and sets up everything for rfkill */
2465 static void hso_create_rfkill(struct hso_device *hso_dev,
2466                              struct usb_interface *interface)
2467 {
2468         struct hso_net *hso_net = dev2net(hso_dev);
2469         struct device *dev = &hso_net->net->dev;
2470         static u32 rfkill_counter;
2471
2472         snprintf(hso_net->name, sizeof(hso_net->name), "hso-%d",
2473                  rfkill_counter++);
2474
2475         hso_net->rfkill = rfkill_alloc(hso_net->name,
2476                                        &interface_to_usbdev(interface)->dev,
2477                                        RFKILL_TYPE_WWAN,
2478                                        &hso_rfkill_ops, hso_dev);
2479         if (!hso_net->rfkill) {
2480                 dev_err(dev, "%s - Out of memory\n", __func__);
2481                 return;
2482         }
2483         if (rfkill_register(hso_net->rfkill) < 0) {
2484                 rfkill_destroy(hso_net->rfkill);
2485                 hso_net->rfkill = NULL;
2486                 dev_err(dev, "%s - Failed to register rfkill\n", __func__);
2487                 return;
2488         }
2489 }
2490
2491 static struct device_type hso_type = {
2492         .name   = "wwan",
2493 };
2494
2495 /* Creates our network device */
2496 static struct hso_device *hso_create_net_device(struct usb_interface *interface,
2497                                                 int port_spec)
2498 {
2499         int result, i;
2500         struct net_device *net;
2501         struct hso_net *hso_net;
2502         struct hso_device *hso_dev;
2503
2504         hso_dev = hso_create_device(interface, port_spec);
2505         if (!hso_dev)
2506                 return NULL;
2507
2508         /* allocate our network device, then we can put in our private data */
2509         /* call hso_net_init to do the basic initialization */
2510         net = alloc_netdev(sizeof(struct hso_net), "hso%d", NET_NAME_UNKNOWN,
2511                            hso_net_init);
2512         if (!net) {
2513                 dev_err(&interface->dev, "Unable to create ethernet device\n");
2514                 goto err_hso_dev;
2515         }
2516
2517         hso_net = netdev_priv(net);
2518
2519         hso_dev->port_data.dev_net = hso_net;
2520         hso_net->net = net;
2521         hso_net->parent = hso_dev;
2522
2523         hso_net->in_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2524                                       USB_DIR_IN);
2525         if (!hso_net->in_endp) {
2526                 dev_err(&interface->dev, "Can't find BULK IN endpoint\n");
2527                 goto err_net;
2528         }
2529         hso_net->out_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2530                                        USB_DIR_OUT);
2531         if (!hso_net->out_endp) {
2532                 dev_err(&interface->dev, "Can't find BULK OUT endpoint\n");
2533                 goto err_net;
2534         }
2535         SET_NETDEV_DEV(net, &interface->dev);
2536         SET_NETDEV_DEVTYPE(net, &hso_type);
2537
2538         /* start allocating */
2539         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2540                 hso_net->mux_bulk_rx_urb_pool[i] = usb_alloc_urb(0, GFP_KERNEL);
2541                 if (!hso_net->mux_bulk_rx_urb_pool[i])
2542                         goto err_mux_bulk_rx;
2543                 hso_net->mux_bulk_rx_buf_pool[i] = kzalloc(MUX_BULK_RX_BUF_SIZE,
2544                                                            GFP_KERNEL);
2545                 if (!hso_net->mux_bulk_rx_buf_pool[i])
2546                         goto err_mux_bulk_rx;
2547         }
2548         hso_net->mux_bulk_tx_urb = usb_alloc_urb(0, GFP_KERNEL);
2549         if (!hso_net->mux_bulk_tx_urb)
2550                 goto err_mux_bulk_rx;
2551         hso_net->mux_bulk_tx_buf = kzalloc(MUX_BULK_TX_BUF_SIZE, GFP_KERNEL);
2552         if (!hso_net->mux_bulk_tx_buf)
2553                 goto err_free_tx_urb;
2554
2555         add_net_device(hso_dev);
2556
2557         /* registering our net device */
2558         result = register_netdev(net);
2559         if (result) {
2560                 dev_err(&interface->dev, "Failed to register device\n");
2561                 goto err_free_tx_buf;
2562         }
2563
2564         hso_log_port(hso_dev);
2565
2566         hso_create_rfkill(hso_dev, interface);
2567
2568         return hso_dev;
2569
2570 err_free_tx_buf:
2571         remove_net_device(hso_dev);
2572         kfree(hso_net->mux_bulk_tx_buf);
2573 err_free_tx_urb:
2574         usb_free_urb(hso_net->mux_bulk_tx_urb);
2575 err_mux_bulk_rx:
2576         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2577                 usb_free_urb(hso_net->mux_bulk_rx_urb_pool[i]);
2578                 kfree(hso_net->mux_bulk_rx_buf_pool[i]);
2579         }
2580 err_net:
2581         free_netdev(net);
2582 err_hso_dev:
2583         kfree(hso_dev);
2584         return NULL;
2585 }
2586
2587 static void hso_free_tiomget(struct hso_serial *serial)
2588 {
2589         struct hso_tiocmget *tiocmget;
2590         if (!serial)
2591                 return;
2592         tiocmget = serial->tiocmget;
2593         if (tiocmget) {
2594                 usb_free_urb(tiocmget->urb);
2595                 tiocmget->urb = NULL;
2596                 serial->tiocmget = NULL;
2597                 kfree(tiocmget);
2598         }
2599 }
2600
2601 /* Frees an AT channel ( goes for both mux and non-mux ) */
2602 static void hso_free_serial_device(struct hso_device *hso_dev)
2603 {
2604         struct hso_serial *serial = dev2ser(hso_dev);
2605
2606         if (!serial)
2607                 return;
2608
2609         hso_serial_common_free(serial);
2610
2611         if (serial->shared_int) {
2612                 mutex_lock(&serial->shared_int->shared_int_lock);
2613                 if (--serial->shared_int->ref_count == 0)
2614                         hso_free_shared_int(serial->shared_int);
2615                 else
2616                         mutex_unlock(&serial->shared_int->shared_int_lock);
2617         }
2618         hso_free_tiomget(serial);
2619         kfree(serial);
2620         kfree(hso_dev);
2621 }
2622
2623 /* Creates a bulk AT channel */
2624 static struct hso_device *hso_create_bulk_serial_device(
2625                         struct usb_interface *interface, int port)
2626 {
2627         struct hso_device *hso_dev;
2628         struct hso_serial *serial;
2629         int num_urbs;
2630         struct hso_tiocmget *tiocmget;
2631
2632         hso_dev = hso_create_device(interface, port);
2633         if (!hso_dev)
2634                 return NULL;
2635
2636         serial = kzalloc(sizeof(*serial), GFP_KERNEL);
2637         if (!serial)
2638                 goto exit;
2639
2640         serial->parent = hso_dev;
2641         hso_dev->port_data.dev_serial = serial;
2642
2643         if ((port & HSO_PORT_MASK) == HSO_PORT_MODEM) {
2644                 num_urbs = 2;
2645                 serial->tiocmget = kzalloc(sizeof(struct hso_tiocmget),
2646                                            GFP_KERNEL);
2647                 /* it isn't going to break our heart if serial->tiocmget
2648                  *  allocation fails don't bother checking this.
2649                  */
2650                 if (serial->tiocmget) {
2651                         tiocmget = serial->tiocmget;
2652                         tiocmget->endp = hso_get_ep(interface,
2653                                                     USB_ENDPOINT_XFER_INT,
2654                                                     USB_DIR_IN);
2655                         if (!tiocmget->endp) {
2656                                 dev_err(&interface->dev, "Failed to find INT IN ep\n");
2657                                 goto exit;
2658                         }
2659
2660                         tiocmget->urb = usb_alloc_urb(0, GFP_KERNEL);
2661                         if (tiocmget->urb) {
2662                                 mutex_init(&tiocmget->mutex);
2663                                 init_waitqueue_head(&tiocmget->waitq);
2664                         } else
2665                                 hso_free_tiomget(serial);
2666                 }
2667         }
2668         else
2669                 num_urbs = 1;
2670
2671         if (hso_serial_common_create(serial, num_urbs, BULK_URB_RX_SIZE,
2672                                      BULK_URB_TX_SIZE))
2673                 goto exit;
2674
2675         serial->in_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2676                                      USB_DIR_IN);
2677         if (!serial->in_endp) {
2678                 dev_err(&interface->dev, "Failed to find BULK IN ep\n");
2679                 goto exit2;
2680         }
2681
2682         if (!
2683             (serial->out_endp =
2684              hso_get_ep(interface, USB_ENDPOINT_XFER_BULK, USB_DIR_OUT))) {
2685                 dev_err(&interface->dev, "Failed to find BULK IN ep\n");
2686                 goto exit2;
2687         }
2688
2689         serial->write_data = hso_std_serial_write_data;
2690
2691         /* setup the proc dirs and files if needed */
2692         hso_log_port(hso_dev);
2693
2694         /* done, return it */
2695         return hso_dev;
2696
2697 exit2:
2698         hso_serial_tty_unregister(serial);
2699         hso_serial_common_free(serial);
2700 exit:
2701         hso_free_tiomget(serial);
2702         kfree(serial);
2703         kfree(hso_dev);
2704         return NULL;
2705 }
2706
2707 /* Creates a multiplexed AT channel */
2708 static
2709 struct hso_device *hso_create_mux_serial_device(struct usb_interface *interface,
2710                                                 int port,
2711                                                 struct hso_shared_int *mux)
2712 {
2713         struct hso_device *hso_dev;
2714         struct hso_serial *serial;
2715         int port_spec;
2716
2717         port_spec = HSO_INTF_MUX;
2718         port_spec &= ~HSO_PORT_MASK;
2719
2720         port_spec |= hso_mux_to_port(port);
2721         if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NO_PORT)
2722                 return NULL;
2723
2724         hso_dev = hso_create_device(interface, port_spec);
2725         if (!hso_dev)
2726                 return NULL;
2727
2728         serial = kzalloc(sizeof(*serial), GFP_KERNEL);
2729         if (!serial)
2730                 goto err_free_dev;
2731
2732         hso_dev->port_data.dev_serial = serial;
2733         serial->parent = hso_dev;
2734
2735         if (hso_serial_common_create
2736             (serial, 1, CTRL_URB_RX_SIZE, CTRL_URB_TX_SIZE))
2737                 goto err_free_serial;
2738
2739         serial->tx_data_length--;
2740         serial->write_data = hso_mux_serial_write_data;
2741
2742         serial->shared_int = mux;
2743         mutex_lock(&serial->shared_int->shared_int_lock);
2744         serial->shared_int->ref_count++;
2745         mutex_unlock(&serial->shared_int->shared_int_lock);
2746
2747         /* setup the proc dirs and files if needed */
2748         hso_log_port(hso_dev);
2749
2750         /* done, return it */
2751         return hso_dev;
2752
2753 err_free_serial:
2754         kfree(serial);
2755 err_free_dev:
2756         kfree(hso_dev);
2757         return NULL;
2758
2759 }
2760
2761 static void hso_free_shared_int(struct hso_shared_int *mux)
2762 {
2763         usb_free_urb(mux->shared_intr_urb);
2764         kfree(mux->shared_intr_buf);
2765         mutex_unlock(&mux->shared_int_lock);
2766         kfree(mux);
2767 }
2768
2769 static
2770 struct hso_shared_int *hso_create_shared_int(struct usb_interface *interface)
2771 {
2772         struct hso_shared_int *mux = kzalloc(sizeof(*mux), GFP_KERNEL);
2773
2774         if (!mux)
2775                 return NULL;
2776
2777         mux->intr_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_INT,
2778                                     USB_DIR_IN);
2779         if (!mux->intr_endp) {
2780                 dev_err(&interface->dev, "Can't find INT IN endpoint\n");
2781                 goto exit;
2782         }
2783
2784         mux->shared_intr_urb = usb_alloc_urb(0, GFP_KERNEL);
2785         if (!mux->shared_intr_urb)
2786                 goto exit;
2787         mux->shared_intr_buf =
2788                 kzalloc(le16_to_cpu(mux->intr_endp->wMaxPacketSize),
2789                         GFP_KERNEL);
2790         if (!mux->shared_intr_buf)
2791                 goto exit;
2792
2793         mutex_init(&mux->shared_int_lock);
2794
2795         return mux;
2796
2797 exit:
2798         kfree(mux->shared_intr_buf);
2799         usb_free_urb(mux->shared_intr_urb);
2800         kfree(mux);
2801         return NULL;
2802 }
2803
2804 /* Gets the port spec for a certain interface */
2805 static int hso_get_config_data(struct usb_interface *interface)
2806 {
2807         struct usb_device *usbdev = interface_to_usbdev(interface);
2808         u8 *config_data = kmalloc(17, GFP_KERNEL);
2809         u32 if_num = interface->cur_altsetting->desc.bInterfaceNumber;
2810         s32 result;
2811
2812         if (!config_data)
2813                 return -ENOMEM;
2814         if (usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0),
2815                             0x86, 0xC0, 0, 0, config_data, 17,
2816                             USB_CTRL_SET_TIMEOUT) != 0x11) {
2817                 kfree(config_data);
2818                 return -EIO;
2819         }
2820
2821         /* check if we have a valid interface */
2822         if (if_num > 16) {
2823                 kfree(config_data);
2824                 return -EINVAL;
2825         }
2826
2827         switch (config_data[if_num]) {
2828         case 0x0:
2829                 result = 0;
2830                 break;
2831         case 0x1:
2832                 result = HSO_PORT_DIAG;
2833                 break;
2834         case 0x2:
2835                 result = HSO_PORT_GPS;
2836                 break;
2837         case 0x3:
2838                 result = HSO_PORT_GPS_CONTROL;
2839                 break;
2840         case 0x4:
2841                 result = HSO_PORT_APP;
2842                 break;
2843         case 0x5:
2844                 result = HSO_PORT_APP2;
2845                 break;
2846         case 0x6:
2847                 result = HSO_PORT_CONTROL;
2848                 break;
2849         case 0x7:
2850                 result = HSO_PORT_NETWORK;
2851                 break;
2852         case 0x8:
2853                 result = HSO_PORT_MODEM;
2854                 break;
2855         case 0x9:
2856                 result = HSO_PORT_MSD;
2857                 break;
2858         case 0xa:
2859                 result = HSO_PORT_PCSC;
2860                 break;
2861         case 0xb:
2862                 result = HSO_PORT_VOICE;
2863                 break;
2864         default:
2865                 result = 0;
2866         }
2867
2868         if (result)
2869                 result |= HSO_INTF_BULK;
2870
2871         if (config_data[16] & 0x1)
2872                 result |= HSO_INFO_CRC_BUG;
2873
2874         kfree(config_data);
2875         return result;
2876 }
2877
2878 /* called once for each interface upon device insertion */
2879 static int hso_probe(struct usb_interface *interface,
2880                      const struct usb_device_id *id)
2881 {
2882         int mux, i, if_num, port_spec;
2883         unsigned char port_mask;
2884         struct hso_device *hso_dev = NULL;
2885         struct hso_shared_int *shared_int;
2886         struct hso_device *tmp_dev = NULL;
2887
2888         if (interface->cur_altsetting->desc.bInterfaceClass != 0xFF) {
2889                 dev_err(&interface->dev, "Not our interface\n");
2890                 return -ENODEV;
2891         }
2892
2893         if_num = interface->cur_altsetting->desc.bInterfaceNumber;
2894
2895         /* Get the interface/port specification from either driver_info or from
2896          * the device itself */
2897         if (id->driver_info) {
2898                 /* if_num is controlled by the device, driver_info is a 0 terminated
2899                  * array. Make sure, the access is in bounds! */
2900                 for (i = 0; i <= if_num; ++i)
2901                         if (((u32 *)(id->driver_info))[i] == 0)
2902                                 goto exit;
2903                 port_spec = ((u32 *)(id->driver_info))[if_num];
2904         } else {
2905                 port_spec = hso_get_config_data(interface);
2906                 if (port_spec < 0)
2907                         goto exit;
2908         }
2909
2910         /* Check if we need to switch to alt interfaces prior to port
2911          * configuration */
2912         if (interface->num_altsetting > 1)
2913                 usb_set_interface(interface_to_usbdev(interface), if_num, 1);
2914         interface->needs_remote_wakeup = 1;
2915
2916         /* Allocate new hso device(s) */
2917         switch (port_spec & HSO_INTF_MASK) {
2918         case HSO_INTF_MUX:
2919                 if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2920                         /* Create the network device */
2921                         if (!disable_net) {
2922                                 hso_dev = hso_create_net_device(interface,
2923                                                                 port_spec);
2924                                 if (!hso_dev)
2925                                         goto exit;
2926                                 tmp_dev = hso_dev;
2927                         }
2928                 }
2929
2930                 if (hso_get_mux_ports(interface, &port_mask))
2931                         /* TODO: de-allocate everything */
2932                         goto exit;
2933
2934                 shared_int = hso_create_shared_int(interface);
2935                 if (!shared_int)
2936                         goto exit;
2937
2938                 for (i = 1, mux = 0; i < 0x100; i = i << 1, mux++) {
2939                         if (port_mask & i) {
2940                                 hso_dev = hso_create_mux_serial_device(
2941                                                 interface, i, shared_int);
2942                                 if (!hso_dev)
2943                                         goto exit;
2944                         }
2945                 }
2946
2947                 if (tmp_dev)
2948                         hso_dev = tmp_dev;
2949                 break;
2950
2951         case HSO_INTF_BULK:
2952                 /* It's a regular bulk interface */
2953                 if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2954                         if (!disable_net)
2955                                 hso_dev =
2956                                     hso_create_net_device(interface, port_spec);
2957                 } else {
2958                         hso_dev =
2959                             hso_create_bulk_serial_device(interface, port_spec);
2960                 }
2961                 if (!hso_dev)
2962                         goto exit;
2963                 break;
2964         default:
2965                 goto exit;
2966         }
2967
2968         /* save our data pointer in this device */
2969         usb_set_intfdata(interface, hso_dev);
2970
2971         /* done */
2972         return 0;
2973 exit:
2974         hso_free_interface(interface);
2975         return -ENODEV;
2976 }
2977
2978 /* device removed, cleaning up */
2979 static void hso_disconnect(struct usb_interface *interface)
2980 {
2981         hso_free_interface(interface);
2982
2983         /* remove reference of our private data */
2984         usb_set_intfdata(interface, NULL);
2985 }
2986
2987 static void async_get_intf(struct work_struct *data)
2988 {
2989         struct hso_device *hso_dev =
2990             container_of(data, struct hso_device, async_get_intf);
2991         usb_autopm_get_interface(hso_dev->interface);
2992 }
2993
2994 static void async_put_intf(struct work_struct *data)
2995 {
2996         struct hso_device *hso_dev =
2997             container_of(data, struct hso_device, async_put_intf);
2998         usb_autopm_put_interface(hso_dev->interface);
2999 }
3000
3001 static int hso_get_activity(struct hso_device *hso_dev)
3002 {
3003         if (hso_dev->usb->state == USB_STATE_SUSPENDED) {
3004                 if (!hso_dev->is_active) {
3005                         hso_dev->is_active = 1;
3006                         schedule_work(&hso_dev->async_get_intf);
3007                 }
3008         }
3009
3010         if (hso_dev->usb->state != USB_STATE_CONFIGURED)
3011                 return -EAGAIN;
3012
3013         usb_mark_last_busy(hso_dev->usb);
3014
3015         return 0;
3016 }
3017
3018 static int hso_put_activity(struct hso_device *hso_dev)
3019 {
3020         if (hso_dev->usb->state != USB_STATE_SUSPENDED) {
3021                 if (hso_dev->is_active) {
3022                         hso_dev->is_active = 0;
3023                         schedule_work(&hso_dev->async_put_intf);
3024                         return -EAGAIN;
3025                 }
3026         }
3027         hso_dev->is_active = 0;
3028         return 0;
3029 }
3030
3031 /* called by kernel when we need to suspend device */
3032 static int hso_suspend(struct usb_interface *iface, pm_message_t message)
3033 {
3034         int i, result;
3035
3036         /* Stop all serial ports */
3037         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3038                 if (serial_table[i] && (serial_table[i]->interface == iface)) {
3039                         result = hso_stop_serial_device(serial_table[i]);
3040                         if (result)
3041                                 goto out;
3042                 }
3043         }
3044
3045         /* Stop all network ports */
3046         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3047                 if (network_table[i] &&
3048                     (network_table[i]->interface == iface)) {
3049                         result = hso_stop_net_device(network_table[i]);
3050                         if (result)
3051                                 goto out;
3052                 }
3053         }
3054
3055 out:
3056         return 0;
3057 }
3058
3059 /* called by kernel when we need to resume device */
3060 static int hso_resume(struct usb_interface *iface)
3061 {
3062         int i, result = 0;
3063         struct hso_net *hso_net;
3064
3065         /* Start all serial ports */
3066         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3067                 if (serial_table[i] && (serial_table[i]->interface == iface)) {
3068                         if (dev2ser(serial_table[i])->port.count) {
3069                                 result =
3070                                     hso_start_serial_device(serial_table[i], GFP_NOIO);
3071                                 hso_kick_transmit(dev2ser(serial_table[i]));
3072                                 if (result)
3073                                         goto out;
3074                         }
3075                 }
3076         }
3077
3078         /* Start all network ports */
3079         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3080                 if (network_table[i] &&
3081                     (network_table[i]->interface == iface)) {
3082                         hso_net = dev2net(network_table[i]);
3083                         if (hso_net->flags & IFF_UP) {
3084                                 /* First transmit any lingering data,
3085                                    then restart the device. */
3086                                 if (hso_net->skb_tx_buf) {
3087                                         dev_dbg(&iface->dev,
3088                                                 "Transmitting"
3089                                                 " lingering data\n");
3090                                         hso_net_start_xmit(hso_net->skb_tx_buf,
3091                                                            hso_net->net);
3092                                         hso_net->skb_tx_buf = NULL;
3093                                 }
3094                                 result = hso_start_net_device(network_table[i]);
3095                                 if (result)
3096                                         goto out;
3097                         }
3098                 }
3099         }
3100
3101 out:
3102         return result;
3103 }
3104
3105 static void hso_serial_ref_free(struct kref *ref)
3106 {
3107         struct hso_device *hso_dev = container_of(ref, struct hso_device, ref);
3108
3109         hso_free_serial_device(hso_dev);
3110 }
3111
3112 static void hso_free_interface(struct usb_interface *interface)
3113 {
3114         struct hso_serial *serial;
3115         int i;
3116
3117         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3118                 if (serial_table[i] &&
3119                     (serial_table[i]->interface == interface)) {
3120                         serial = dev2ser(serial_table[i]);
3121                         tty_port_tty_hangup(&serial->port, false);
3122                         mutex_lock(&serial->parent->mutex);
3123                         serial->parent->usb_gone = 1;
3124                         mutex_unlock(&serial->parent->mutex);
3125                         cancel_work_sync(&serial_table[i]->async_put_intf);
3126                         cancel_work_sync(&serial_table[i]->async_get_intf);
3127                         hso_serial_tty_unregister(serial);
3128                         kref_put(&serial->parent->ref, hso_serial_ref_free);
3129                 }
3130         }
3131
3132         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3133                 if (network_table[i] &&
3134                     (network_table[i]->interface == interface)) {
3135                         struct rfkill *rfk = dev2net(network_table[i])->rfkill;
3136                         /* hso_stop_net_device doesn't stop the net queue since
3137                          * traffic needs to start it again when suspended */
3138                         netif_stop_queue(dev2net(network_table[i])->net);
3139                         hso_stop_net_device(network_table[i]);
3140                         cancel_work_sync(&network_table[i]->async_put_intf);
3141                         cancel_work_sync(&network_table[i]->async_get_intf);
3142                         if (rfk) {
3143                                 rfkill_unregister(rfk);
3144                                 rfkill_destroy(rfk);
3145                         }
3146                         hso_free_net_device(network_table[i]);
3147                 }
3148         }
3149 }
3150
3151 /* Helper functions */
3152
3153 /* Get the endpoint ! */
3154 static struct usb_endpoint_descriptor *hso_get_ep(struct usb_interface *intf,
3155                                                   int type, int dir)
3156 {
3157         int i;
3158         struct usb_host_interface *iface = intf->cur_altsetting;
3159         struct usb_endpoint_descriptor *endp;
3160
3161         for (i = 0; i < iface->desc.bNumEndpoints; i++) {
3162                 endp = &iface->endpoint[i].desc;
3163                 if (((endp->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == dir) &&
3164                     (usb_endpoint_type(endp) == type))
3165                         return endp;
3166         }
3167
3168         return NULL;
3169 }
3170
3171 /* Get the byte that describes which ports are enabled */
3172 static int hso_get_mux_ports(struct usb_interface *intf, unsigned char *ports)
3173 {
3174         int i;
3175         struct usb_host_interface *iface = intf->cur_altsetting;
3176
3177         if (iface->extralen == 3) {
3178                 *ports = iface->extra[2];
3179                 return 0;
3180         }
3181
3182         for (i = 0; i < iface->desc.bNumEndpoints; i++) {
3183                 if (iface->endpoint[i].extralen == 3) {
3184                         *ports = iface->endpoint[i].extra[2];
3185                         return 0;
3186                 }
3187         }
3188
3189         return -1;
3190 }
3191
3192 /* interrupt urb needs to be submitted, used for serial read of muxed port */
3193 static int hso_mux_submit_intr_urb(struct hso_shared_int *shared_int,
3194                                    struct usb_device *usb, gfp_t gfp)
3195 {
3196         int result;
3197
3198         usb_fill_int_urb(shared_int->shared_intr_urb, usb,
3199                          usb_rcvintpipe(usb,
3200                                 shared_int->intr_endp->bEndpointAddress & 0x7F),
3201                          shared_int->shared_intr_buf,
3202                          1,
3203                          intr_callback, shared_int,
3204                          shared_int->intr_endp->bInterval);
3205
3206         result = usb_submit_urb(shared_int->shared_intr_urb, gfp);
3207         if (result)
3208                 dev_warn(&usb->dev, "%s failed mux_intr_urb %d\n", __func__,
3209                         result);
3210
3211         return result;
3212 }
3213
3214 /* operations setup of the serial interface */
3215 static const struct tty_operations hso_serial_ops = {
3216         .open = hso_serial_open,
3217         .close = hso_serial_close,
3218         .write = hso_serial_write,
3219         .write_room = hso_serial_write_room,
3220         .cleanup = hso_serial_cleanup,
3221         .ioctl = hso_serial_ioctl,
3222         .set_termios = hso_serial_set_termios,
3223         .chars_in_buffer = hso_serial_chars_in_buffer,
3224         .tiocmget = hso_serial_tiocmget,
3225         .tiocmset = hso_serial_tiocmset,
3226         .get_icount = hso_get_count,
3227         .unthrottle = hso_unthrottle
3228 };
3229
3230 static struct usb_driver hso_driver = {
3231         .name = driver_name,
3232         .probe = hso_probe,
3233         .disconnect = hso_disconnect,
3234         .id_table = hso_ids,
3235         .suspend = hso_suspend,
3236         .resume = hso_resume,
3237         .reset_resume = hso_resume,
3238         .supports_autosuspend = 1,
3239         .disable_hub_initiated_lpm = 1,
3240 };
3241
3242 static int __init hso_init(void)
3243 {
3244         int i;
3245         int result;
3246
3247         /* put it in the log */
3248         pr_info("%s\n", version);
3249
3250         /* Initialise the serial table semaphore and table */
3251         spin_lock_init(&serial_table_lock);
3252         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++)
3253                 serial_table[i] = NULL;
3254
3255         /* allocate our driver using the proper amount of supported minors */
3256         tty_drv = alloc_tty_driver(HSO_SERIAL_TTY_MINORS);
3257         if (!tty_drv)
3258                 return -ENOMEM;
3259
3260         /* fill in all needed values */
3261         tty_drv->driver_name = driver_name;
3262         tty_drv->name = tty_filename;
3263
3264         /* if major number is provided as parameter, use that one */
3265         if (tty_major)
3266                 tty_drv->major = tty_major;
3267
3268         tty_drv->minor_start = 0;
3269         tty_drv->type = TTY_DRIVER_TYPE_SERIAL;
3270         tty_drv->subtype = SERIAL_TYPE_NORMAL;
3271         tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
3272         tty_drv->init_termios = tty_std_termios;
3273         hso_init_termios(&tty_drv->init_termios);
3274         tty_set_operations(tty_drv, &hso_serial_ops);
3275
3276         /* register the tty driver */
3277         result = tty_register_driver(tty_drv);
3278         if (result) {
3279                 pr_err("%s - tty_register_driver failed(%d)\n",
3280                        __func__, result);
3281                 goto err_free_tty;
3282         }
3283
3284         /* register this module as an usb driver */
3285         result = usb_register(&hso_driver);
3286         if (result) {
3287                 pr_err("Could not register hso driver - error: %d\n", result);
3288                 goto err_unreg_tty;
3289         }
3290
3291         /* done */
3292         return 0;
3293 err_unreg_tty:
3294         tty_unregister_driver(tty_drv);
3295 err_free_tty:
3296         put_tty_driver(tty_drv);
3297         return result;
3298 }
3299
3300 static void __exit hso_exit(void)
3301 {
3302         pr_info("unloaded\n");
3303
3304         tty_unregister_driver(tty_drv);
3305         /* deregister the usb driver */
3306         usb_deregister(&hso_driver);
3307         put_tty_driver(tty_drv);
3308 }
3309
3310 /* Module definitions */
3311 module_init(hso_init);
3312 module_exit(hso_exit);
3313
3314 MODULE_AUTHOR(MOD_AUTHOR);
3315 MODULE_DESCRIPTION(MOD_DESCRIPTION);
3316 MODULE_LICENSE("GPL");
3317
3318 /* change the debug level (eg: insmod hso.ko debug=0x04) */
3319 MODULE_PARM_DESC(debug, "debug level mask [0x01 | 0x02 | 0x04 | 0x08 | 0x10]");
3320 module_param(debug, int, 0644);
3321
3322 /* set the major tty number (eg: insmod hso.ko tty_major=245) */
3323 MODULE_PARM_DESC(tty_major, "Set the major tty number");
3324 module_param(tty_major, int, 0644);
3325
3326 /* disable network interface (eg: insmod hso.ko disable_net=1) */
3327 MODULE_PARM_DESC(disable_net, "Disable the network interface");
3328 module_param(disable_net, int, 0644);