drivers/usb/serial/cp210x.c

   1 /*
   2  * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
   3  *
   4  * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License version
   8  *      2 as published by the Free Software Foundation.
   9  *
  10  * Support to set flow control line levels using TIOCMGET and TIOCMSET
  11  * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
  12  * control thanks to Munir Nassar nassarmu@real-time.com
  13  *
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/errno.h>
  18 #include <linux/slab.h>
  19 #include <linux/tty.h>
  20 #include <linux/tty_flip.h>
  21 #include <linux/module.h>
  22 #include <linux/moduleparam.h>
  23 #include <linux/usb.h>
  24 #include <linux/uaccess.h>
  25 #include <linux/usb/serial.h>
  26
  27 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
  28
  29 /*
  30  * Function Prototypes
  31  */
  32 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
  33 static void cp210x_close(struct usb_serial_port *);
  34 static void cp210x_get_termios(struct tty_struct *, struct usb_serial_port *);
  35 static void cp210x_get_termios_port(struct usb_serial_port *port,
  36         unsigned int *cflagp, unsigned int *baudp);
  37 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
  38                                                         struct ktermios *);
  39 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
  40                                                         struct ktermios*);
  41 static bool cp210x_tx_empty(struct usb_serial_port *port);
  42 static int cp210x_tiocmget(struct tty_struct *);
  43 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
  44 static int cp210x_tiocmset_port(struct usb_serial_port *port,
  45                 unsigned int, unsigned int);
  46 static void cp210x_break_ctl(struct tty_struct *, int);
  47 static int cp210x_port_probe(struct usb_serial_port *);
  48 static int cp210x_port_remove(struct usb_serial_port *);
  49 static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
  50
  51 static const struct usb_device_id id_table[] = {
  52         { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
  53         { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
  54         { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  55         { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  56         { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
  57         { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
  58         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
  59         { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
  60         { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
  61         { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
  62         { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
  63         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  64         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
  65         { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
  66         { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
  67         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  68         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  69         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  70         { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
  71         { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
  72         { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
  73         { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
  74         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  75         { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
  76         { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
  77         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
  78         { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
  79         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  80         { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
  81         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  82         { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
  83         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  84         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
  85         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  86         { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
  87         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  88         { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
  89         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
  90         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
  91         { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
  92         { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
  93         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
  94         { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
  95         { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
  96         { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
  97         { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
  98         { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
  99         { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
 100         { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
 101         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
 102         { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
 103         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
 104         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
 105         { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
 106         { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
 107         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
 108         { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
 109         { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
 110         { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
 111         { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
 112         { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
 113         { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
 114         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
 115         { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
 116         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
 117         { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
 118         { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
 119         { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
 120         { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
 121         { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
 122         { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
 123         { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
 124         { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
 125         { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
 126         { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
 127         { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
 128         { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
 129         { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
 130         { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
 131         { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
 132         { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
 133         { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
 134         { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
 135         { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
 136         { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
 137         { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
 138         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 139         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 140         { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
 141         { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
 142         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 143         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 144         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 145         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 146         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 147         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 148         { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
 149         { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
 150         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 151         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 152         { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
 153         { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
 154         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 155         { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
 156         { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
 157         { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
 158         { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
 159         { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
 160         { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
 161         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 162         { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
 163         { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
 164         { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
 165         { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
 166         { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
 167         { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
 168         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
 169         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
 170         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 171         { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
 172         { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
 173         { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
 174         { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
 175         { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
 176         { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
 177         { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
 178         { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
 179         { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
 180         { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
 181         { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
 182         { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
 183         { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
 184         { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
 185         { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
 186         { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
 187         { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
 188         { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
 189         { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
 190         { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
 191         { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
 192         { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
 193         { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
 194         { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
 195         { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
 196         { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
 197         { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
 198         { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
 199         { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
 200         { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
 201         { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
 202         { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
 203         { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
 204         { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
 205         { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
 206         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 207         { } /* Terminating Entry */
 208 };
 209
 210 MODULE_DEVICE_TABLE(usb, id_table);
 211
 212 struct cp210x_port_private {
 213         __u8                    bInterfaceNumber;
 214         bool                    has_swapped_line_ctl;
 215 };
 216
 217 static struct usb_serial_driver cp210x_device = {
 218         .driver = {
 219                 .owner =        THIS_MODULE,
 220                 .name =         "cp210x",
 221         },
 222         .id_table               = id_table,
 223         .num_ports              = 1,
 224         .bulk_in_size           = 256,
 225         .bulk_out_size          = 256,
 226         .open                   = cp210x_open,
 227         .close                  = cp210x_close,
 228         .break_ctl              = cp210x_break_ctl,
 229         .set_termios            = cp210x_set_termios,
 230         .tx_empty               = cp210x_tx_empty,
 231         .tiocmget               = cp210x_tiocmget,
 232         .tiocmset               = cp210x_tiocmset,
 233         .port_probe             = cp210x_port_probe,
 234         .port_remove            = cp210x_port_remove,
 235         .dtr_rts                = cp210x_dtr_rts
 236 };
 237
 238 static struct usb_serial_driver * const serial_drivers[] = {
 239         &cp210x_device, NULL
 240 };
 241
 242 /* Config request types */
 243 #define REQTYPE_HOST_TO_INTERFACE       0x41
 244 #define REQTYPE_INTERFACE_TO_HOST       0xc1
 245 #define REQTYPE_HOST_TO_DEVICE  0x40
 246 #define REQTYPE_DEVICE_TO_HOST  0xc0
 247
 248 /* Config request codes */
 249 #define CP210X_IFC_ENABLE       0x00
 250 #define CP210X_SET_BAUDDIV      0x01
 251 #define CP210X_GET_BAUDDIV      0x02
 252 #define CP210X_SET_LINE_CTL     0x03
 253 #define CP210X_GET_LINE_CTL     0x04
 254 #define CP210X_SET_BREAK        0x05
 255 #define CP210X_IMM_CHAR         0x06
 256 #define CP210X_SET_MHS          0x07
 257 #define CP210X_GET_MDMSTS       0x08
 258 #define CP210X_SET_XON          0x09
 259 #define CP210X_SET_XOFF         0x0A
 260 #define CP210X_SET_EVENTMASK    0x0B
 261 #define CP210X_GET_EVENTMASK    0x0C
 262 #define CP210X_SET_CHAR         0x0D
 263 #define CP210X_GET_CHARS        0x0E
 264 #define CP210X_GET_PROPS        0x0F
 265 #define CP210X_GET_COMM_STATUS  0x10
 266 #define CP210X_RESET            0x11
 267 #define CP210X_PURGE            0x12
 268 #define CP210X_SET_FLOW         0x13
 269 #define CP210X_GET_FLOW         0x14
 270 #define CP210X_EMBED_EVENTS     0x15
 271 #define CP210X_GET_EVENTSTATE   0x16
 272 #define CP210X_SET_CHARS        0x19
 273 #define CP210X_GET_BAUDRATE     0x1D
 274 #define CP210X_SET_BAUDRATE     0x1E
 275
 276 /* CP210X_IFC_ENABLE */
 277 #define UART_ENABLE             0x0001
 278 #define UART_DISABLE            0x0000
 279
 280 /* CP210X_(SET|GET)_BAUDDIV */
 281 #define BAUD_RATE_GEN_FREQ      0x384000
 282
 283 /* CP210X_(SET|GET)_LINE_CTL */
 284 #define BITS_DATA_MASK          0X0f00
 285 #define BITS_DATA_5             0X0500
 286 #define BITS_DATA_6             0X0600
 287 #define BITS_DATA_7             0X0700
 288 #define BITS_DATA_8             0X0800
 289 #define BITS_DATA_9             0X0900
 290
 291 #define BITS_PARITY_MASK        0x00f0
 292 #define BITS_PARITY_NONE        0x0000
 293 #define BITS_PARITY_ODD         0x0010
 294 #define BITS_PARITY_EVEN        0x0020
 295 #define BITS_PARITY_MARK        0x0030
 296 #define BITS_PARITY_SPACE       0x0040
 297
 298 #define BITS_STOP_MASK          0x000f
 299 #define BITS_STOP_1             0x0000
 300 #define BITS_STOP_1_5           0x0001
 301 #define BITS_STOP_2             0x0002
 302
 303 /* CP210X_SET_BREAK */
 304 #define BREAK_ON                0x0001
 305 #define BREAK_OFF               0x0000
 306
 307 /* CP210X_(SET_MHS|GET_MDMSTS) */
 308 #define CONTROL_DTR             0x0001
 309 #define CONTROL_RTS             0x0002
 310 #define CONTROL_CTS             0x0010
 311 #define CONTROL_DSR             0x0020
 312 #define CONTROL_RING            0x0040
 313 #define CONTROL_DCD             0x0080
 314 #define CONTROL_WRITE_DTR       0x0100
 315 #define CONTROL_WRITE_RTS       0x0200
 316
 317 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
 318 struct cp210x_comm_status {
 319         __le32   ulErrors;
 320         __le32   ulHoldReasons;
 321         __le32   ulAmountInInQueue;
 322         __le32   ulAmountInOutQueue;
 323         u8       bEofReceived;
 324         u8       bWaitForImmediate;
 325         u8       bReserved;
 326 } __packed;
 327
 328 /*
 329  * CP210X_PURGE - 16 bits passed in wValue of USB request.
 330  * SiLabs app note AN571 gives a strange description of the 4 bits:
 331  * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
 332  * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
 333  */
 334 #define PURGE_ALL               0x000f
 335
 336 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
 337 struct cp210x_flow_ctl {
 338         __le32  ulControlHandshake;
 339         __le32  ulFlowReplace;
 340         __le32  ulXonLimit;
 341         __le32  ulXoffLimit;
 342 } __packed;
 343
 344 /* cp210x_flow_ctl::ulControlHandshake */
 345 #define CP210X_SERIAL_DTR_MASK          GENMASK(1, 0)
 346 #define CP210X_SERIAL_DTR_SHIFT(_mode)  (_mode)
 347 #define CP210X_SERIAL_CTS_HANDSHAKE     BIT(3)
 348 #define CP210X_SERIAL_DSR_HANDSHAKE     BIT(4)
 349 #define CP210X_SERIAL_DCD_HANDSHAKE     BIT(5)
 350 #define CP210X_SERIAL_DSR_SENSITIVITY   BIT(6)
 351
 352 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
 353 #define CP210X_SERIAL_DTR_INACTIVE      0
 354 #define CP210X_SERIAL_DTR_ACTIVE        1
 355 #define CP210X_SERIAL_DTR_FLOW_CTL      2
 356
 357 /* cp210x_flow_ctl::ulFlowReplace */
 358 #define CP210X_SERIAL_AUTO_TRANSMIT     BIT(0)
 359 #define CP210X_SERIAL_AUTO_RECEIVE      BIT(1)
 360 #define CP210X_SERIAL_ERROR_CHAR        BIT(2)
 361 #define CP210X_SERIAL_NULL_STRIPPING    BIT(3)
 362 #define CP210X_SERIAL_BREAK_CHAR        BIT(4)
 363 #define CP210X_SERIAL_RTS_MASK          GENMASK(7, 6)
 364 #define CP210X_SERIAL_RTS_SHIFT(_mode)  (_mode << 6)
 365 #define CP210X_SERIAL_XOFF_CONTINUE     BIT(31)
 366
 367 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
 368 #define CP210X_SERIAL_RTS_INACTIVE      0
 369 #define CP210X_SERIAL_RTS_ACTIVE        1
 370 #define CP210X_SERIAL_RTS_FLOW_CTL      2
 371
 372 /*
 373  * Reads a variable-sized block of CP210X_ registers, identified by req.
 374  * Returns data into buf in native USB byte order.
 375  */
 376 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
 377                 void *buf, int bufsize)
 378 {
 379         struct usb_serial *serial = port->serial;
 380         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 381         void *dmabuf;
 382         int result;
 383
 384         dmabuf = kmalloc(bufsize, GFP_KERNEL);
 385         if (!dmabuf) {
 386                 /*
 387                  * FIXME Some callers don't bother to check for error,
 388                  * at least give them consistent junk until they are fixed
 389                  */
 390                 memset(buf, 0, bufsize);
 391                 return -ENOMEM;
 392         }
 393
 394         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 395                         req, REQTYPE_INTERFACE_TO_HOST, 0,
 396                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 397                         USB_CTRL_SET_TIMEOUT);
 398         if (result == bufsize) {
 399                 memcpy(buf, dmabuf, bufsize);
 400                 result = 0;
 401         } else {
 402                 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
 403                                 req, bufsize, result);
 404                 if (result >= 0)
 405                         result = -EPROTO;
 406
 407                 /*
 408                  * FIXME Some callers don't bother to check for error,
 409                  * at least give them consistent junk until they are fixed
 410                  */
 411                 memset(buf, 0, bufsize);
 412         }
 413
 414         kfree(dmabuf);
 415
 416         return result;
 417 }
 418
 419 /*
 420  * Reads any 32-bit CP210X_ register identified by req.
 421  */
 422 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
 423 {
 424         __le32 le32_val;
 425         int err;
 426
 427         err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
 428         if (err) {
 429                 /*
 430                  * FIXME Some callers don't bother to check for error,
 431                  * at least give them consistent junk until they are fixed
 432                  */
 433                 *val = 0;
 434                 return err;
 435         }
 436
 437         *val = le32_to_cpu(le32_val);
 438
 439         return 0;
 440 }
 441
 442 /*
 443  * Reads any 16-bit CP210X_ register identified by req.
 444  */
 445 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
 446 {
 447         __le16 le16_val;
 448         int err;
 449
 450         err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
 451         if (err)
 452                 return err;
 453
 454         *val = le16_to_cpu(le16_val);
 455
 456         return 0;
 457 }
 458
 459 /*
 460  * Reads any 8-bit CP210X_ register identified by req.
 461  */
 462 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
 463 {
 464         return cp210x_read_reg_block(port, req, val, sizeof(*val));
 465 }
 466
 467 /*
 468  * Writes any 16-bit CP210X_ register (req) whose value is passed
 469  * entirely in the wValue field of the USB request.
 470  */
 471 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
 472 {
 473         struct usb_serial *serial = port->serial;
 474         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 475         int result;
 476
 477         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 478                         req, REQTYPE_HOST_TO_INTERFACE, val,
 479                         port_priv->bInterfaceNumber, NULL, 0,
 480                         USB_CTRL_SET_TIMEOUT);
 481         if (result < 0) {
 482                 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
 483                                 req, result);
 484         }
 485
 486         return result;
 487 }
 488
 489 /*
 490  * Writes a variable-sized block of CP210X_ registers, identified by req.
 491  * Data in buf must be in native USB byte order.
 492  */
 493 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
 494                 void *buf, int bufsize)
 495 {
 496         struct usb_serial *serial = port->serial;
 497         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 498         void *dmabuf;
 499         int result;
 500
 501         dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
 502         if (!dmabuf)
 503                 return -ENOMEM;
 504
 505         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 506                         req, REQTYPE_HOST_TO_INTERFACE, 0,
 507                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 508                         USB_CTRL_SET_TIMEOUT);
 509
 510         kfree(dmabuf);
 511
 512         if (result == bufsize) {
 513                 result = 0;
 514         } else {
 515                 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
 516                                 req, bufsize, result);
 517                 if (result >= 0)
 518                         result = -EPROTO;
 519         }
 520
 521         return result;
 522 }
 523
 524 /*
 525  * Writes any 32-bit CP210X_ register identified by req.
 526  */
 527 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
 528 {
 529         __le32 le32_val;
 530
 531         le32_val = cpu_to_le32(val);
 532
 533         return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
 534 }
 535
 536 /*
 537  * Detect CP2108 GET_LINE_CTL bug and activate workaround.
 538  * Write a known good value 0x800, read it back.
 539  * If it comes back swapped the bug is detected.
 540  * Preserve the original register value.
 541  */
 542 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
 543 {
 544         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 545         u16 line_ctl_save;
 546         u16 line_ctl_test;
 547         int err;
 548
 549         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
 550         if (err)
 551                 return err;
 552
 553         err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
 554         if (err)
 555                 return err;
 556
 557         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
 558         if (err)
 559                 return err;
 560
 561         if (line_ctl_test == 8) {
 562                 port_priv->has_swapped_line_ctl = true;
 563                 line_ctl_save = swab16(line_ctl_save);
 564         }
 565
 566         return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
 567 }
 568
 569 /*
 570  * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
 571  * to workaround cp2108 bug and get correct value.
 572  */
 573 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
 574 {
 575         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 576         int err;
 577
 578         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
 579         if (err)
 580                 return err;
 581
 582         /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
 583         if (port_priv->has_swapped_line_ctl)
 584                 *ctl = swab16(*ctl);
 585
 586         return 0;
 587 }
 588
 589 /*
 590  * cp210x_quantise_baudrate
 591  * Quantises the baud rate as per AN205 Table 1
 592  */
 593 static unsigned int cp210x_quantise_baudrate(unsigned int baud)
 594 {
 595         if (baud <= 300)
 596                 baud = 300;
 597         else if (baud <= 600)      baud = 600;
 598         else if (baud <= 1200)     baud = 1200;
 599         else if (baud <= 1800)     baud = 1800;
 600         else if (baud <= 2400)     baud = 2400;
 601         else if (baud <= 4000)     baud = 4000;
 602         else if (baud <= 4803)     baud = 4800;
 603         else if (baud <= 7207)     baud = 7200;
 604         else if (baud <= 9612)     baud = 9600;
 605         else if (baud <= 14428)    baud = 14400;
 606         else if (baud <= 16062)    baud = 16000;
 607         else if (baud <= 19250)    baud = 19200;
 608         else if (baud <= 28912)    baud = 28800;
 609         else if (baud <= 38601)    baud = 38400;
 610         else if (baud <= 51558)    baud = 51200;
 611         else if (baud <= 56280)    baud = 56000;
 612         else if (baud <= 58053)    baud = 57600;
 613         else if (baud <= 64111)    baud = 64000;
 614         else if (baud <= 77608)    baud = 76800;
 615         else if (baud <= 117028)   baud = 115200;
 616         else if (baud <= 129347)   baud = 128000;
 617         else if (baud <= 156868)   baud = 153600;
 618         else if (baud <= 237832)   baud = 230400;
 619         else if (baud <= 254234)   baud = 250000;
 620         else if (baud <= 273066)   baud = 256000;
 621         else if (baud <= 491520)   baud = 460800;
 622         else if (baud <= 567138)   baud = 500000;
 623         else if (baud <= 670254)   baud = 576000;
 624         else if (baud < 1000000)
 625                 baud = 921600;
 626         else if (baud > 2000000)
 627                 baud = 2000000;
 628         return baud;
 629 }
 630
 631 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 632 {
 633         int result;
 634
 635         result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
 636         if (result) {
 637                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
 638                 return result;
 639         }
 640
 641         /* Configure the termios structure */
 642         cp210x_get_termios(tty, port);
 643
 644         /* The baud rate must be initialised on cp2104 */
 645         if (tty)
 646                 cp210x_change_speed(tty, port, NULL);
 647
 648         return usb_serial_generic_open(tty, port);
 649 }
 650
 651 static void cp210x_close(struct usb_serial_port *port)
 652 {
 653         usb_serial_generic_close(port);
 654
 655         /* Clear both queues; cp2108 needs this to avoid an occasional hang */
 656         cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
 657
 658         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 659 }
 660
 661 /*
 662  * Read how many bytes are waiting in the TX queue.
 663  */
 664 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
 665                 u32 *count)
 666 {
 667         struct usb_serial *serial = port->serial;
 668         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 669         struct cp210x_comm_status *sts;
 670         int result;
 671
 672         sts = kmalloc(sizeof(*sts), GFP_KERNEL);
 673         if (!sts)
 674                 return -ENOMEM;
 675
 676         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 677                         CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
 678                         0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
 679                         USB_CTRL_GET_TIMEOUT);
 680         if (result == sizeof(*sts)) {
 681                 *count = le32_to_cpu(sts->ulAmountInOutQueue);
 682                 result = 0;
 683         } else {
 684                 dev_err(&port->dev, "failed to get comm status: %d\n", result);
 685                 if (result >= 0)
 686                         result = -EPROTO;
 687         }
 688
 689         kfree(sts);
 690
 691         return result;
 692 }
 693
 694 static bool cp210x_tx_empty(struct usb_serial_port *port)
 695 {
 696         int err;
 697         u32 count;
 698
 699         err = cp210x_get_tx_queue_byte_count(port, &count);
 700         if (err)
 701                 return true;
 702
 703         return !count;
 704 }
 705
 706 /*
 707  * cp210x_get_termios
 708  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 709  * from the device, corrects any unsupported values, and configures the
 710  * termios structure to reflect the state of the device
 711  */
 712 static void cp210x_get_termios(struct tty_struct *tty,
 713         struct usb_serial_port *port)
 714 {
 715         unsigned int baud;
 716
 717         if (tty) {
 718                 cp210x_get_termios_port(tty->driver_data,
 719                         &tty->termios.c_cflag, &baud);
 720                 tty_encode_baud_rate(tty, baud, baud);
 721         } else {
 722                 unsigned int cflag;
 723                 cflag = 0;
 724                 cp210x_get_termios_port(port, &cflag, &baud);
 725         }
 726 }
 727
 728 /*
 729  * cp210x_get_termios_port
 730  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
 731  */
 732 static void cp210x_get_termios_port(struct usb_serial_port *port,
 733         unsigned int *cflagp, unsigned int *baudp)
 734 {
 735         struct device *dev = &port->dev;
 736         unsigned int cflag;
 737         struct cp210x_flow_ctl flow_ctl;
 738         u32 baud;
 739         u16 bits;
 740         u32 ctl_hs;
 741
 742         cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
 743
 744         dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
 745         *baudp = baud;
 746
 747         cflag = *cflagp;
 748
 749         cp210x_get_line_ctl(port, &bits);
 750         cflag &= ~CSIZE;
 751         switch (bits & BITS_DATA_MASK) {
 752         case BITS_DATA_5:
 753                 dev_dbg(dev, "%s - data bits = 5\n", __func__);
 754                 cflag |= CS5;
 755                 break;
 756         case BITS_DATA_6:
 757                 dev_dbg(dev, "%s - data bits = 6\n", __func__);
 758                 cflag |= CS6;
 759                 break;
 760         case BITS_DATA_7:
 761                 dev_dbg(dev, "%s - data bits = 7\n", __func__);
 762                 cflag |= CS7;
 763                 break;
 764         case BITS_DATA_8:
 765                 dev_dbg(dev, "%s - data bits = 8\n", __func__);
 766                 cflag |= CS8;
 767                 break;
 768         case BITS_DATA_9:
 769                 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
 770                 cflag |= CS8;
 771                 bits &= ~BITS_DATA_MASK;
 772                 bits |= BITS_DATA_8;
 773                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 774                 break;
 775         default:
 776                 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
 777                 cflag |= CS8;
 778                 bits &= ~BITS_DATA_MASK;
 779                 bits |= BITS_DATA_8;
 780                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 781                 break;
 782         }
 783
 784         switch (bits & BITS_PARITY_MASK) {
 785         case BITS_PARITY_NONE:
 786                 dev_dbg(dev, "%s - parity = NONE\n", __func__);
 787                 cflag &= ~PARENB;
 788                 break;
 789         case BITS_PARITY_ODD:
 790                 dev_dbg(dev, "%s - parity = ODD\n", __func__);
 791                 cflag |= (PARENB|PARODD);
 792                 break;
 793         case BITS_PARITY_EVEN:
 794                 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
 795                 cflag &= ~PARODD;
 796                 cflag |= PARENB;
 797                 break;
 798         case BITS_PARITY_MARK:
 799                 dev_dbg(dev, "%s - parity = MARK\n", __func__);
 800                 cflag |= (PARENB|PARODD|CMSPAR);
 801                 break;
 802         case BITS_PARITY_SPACE:
 803                 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
 804                 cflag &= ~PARODD;
 805                 cflag |= (PARENB|CMSPAR);
 806                 break;
 807         default:
 808                 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
 809                 cflag &= ~PARENB;
 810                 bits &= ~BITS_PARITY_MASK;
 811                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 812                 break;
 813         }
 814
 815         cflag &= ~CSTOPB;
 816         switch (bits & BITS_STOP_MASK) {
 817         case BITS_STOP_1:
 818                 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
 819                 break;
 820         case BITS_STOP_1_5:
 821                 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
 822                 bits &= ~BITS_STOP_MASK;
 823                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 824                 break;
 825         case BITS_STOP_2:
 826                 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
 827                 cflag |= CSTOPB;
 828                 break;
 829         default:
 830                 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
 831                 bits &= ~BITS_STOP_MASK;
 832                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 833                 break;
 834         }
 835
 836         cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
 837                         sizeof(flow_ctl));
 838         ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
 839         if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
 840                 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
 841                 cflag |= CRTSCTS;
 842         } else {
 843                 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
 844                 cflag &= ~CRTSCTS;
 845         }
 846
 847         *cflagp = cflag;
 848 }
 849
 850 /*
 851  * CP2101 supports the following baud rates:
 852  *
 853  *      300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
 854  *      38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
 855  *
 856  * CP2102 and CP2103 support the following additional rates:
 857  *
 858  *      4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
 859  *      576000
 860  *
 861  * The device will map a requested rate to a supported one, but the result
 862  * of requests for rates greater than 1053257 is undefined (see AN205).
 863  *
 864  * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
 865  * respectively, with an error less than 1%. The actual rates are determined
 866  * by
 867  *
 868  *      div = round(freq / (2 x prescale x request))
 869  *      actual = freq / (2 x prescale x div)
 870  *
 871  * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
 872  * or 1 otherwise.
 873  * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
 874  * otherwise.
 875  */
 876 static void cp210x_change_speed(struct tty_struct *tty,
 877                 struct usb_serial_port *port, struct ktermios *old_termios)
 878 {
 879         u32 baud;
 880
 881         baud = tty->termios.c_ospeed;
 882
 883         /* This maps the requested rate to a rate valid on cp2102 or cp2103,
 884          * or to an arbitrary rate in [1M,2M].
 885          *
 886          * NOTE: B0 is not implemented.
 887          */
 888         baud = cp210x_quantise_baudrate(baud);
 889
 890         dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
 891         if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
 892                 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
 893                 if (old_termios)
 894                         baud = old_termios->c_ospeed;
 895                 else
 896                         baud = 9600;
 897         }
 898
 899         tty_encode_baud_rate(tty, baud, baud);
 900 }
 901
 902 static void cp210x_set_termios(struct tty_struct *tty,
 903                 struct usb_serial_port *port, struct ktermios *old_termios)
 904 {
 905         struct device *dev = &port->dev;
 906         unsigned int cflag, old_cflag;
 907         u16 bits;
 908
 909         cflag = tty->termios.c_cflag;
 910         old_cflag = old_termios->c_cflag;
 911
 912         if (tty->termios.c_ospeed != old_termios->c_ospeed)
 913                 cp210x_change_speed(tty, port, old_termios);
 914
 915         /* If the number of data bits is to be updated */
 916         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 917                 cp210x_get_line_ctl(port, &bits);
 918                 bits &= ~BITS_DATA_MASK;
 919                 switch (cflag & CSIZE) {
 920                 case CS5:
 921                         bits |= BITS_DATA_5;
 922                         dev_dbg(dev, "%s - data bits = 5\n", __func__);
 923                         break;
 924                 case CS6:
 925                         bits |= BITS_DATA_6;
 926                         dev_dbg(dev, "%s - data bits = 6\n", __func__);
 927                         break;
 928                 case CS7:
 929                         bits |= BITS_DATA_7;
 930                         dev_dbg(dev, "%s - data bits = 7\n", __func__);
 931                         break;
 932                 case CS8:
 933                         bits |= BITS_DATA_8;
 934                         dev_dbg(dev, "%s - data bits = 8\n", __func__);
 935                         break;
 936                 /*case CS9:
 937                         bits |= BITS_DATA_9;
 938                         dev_dbg(dev, "%s - data bits = 9\n", __func__);
 939                         break;*/
 940                 default:
 941                         dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n");
 942                         bits |= BITS_DATA_8;
 943                         break;
 944                 }
 945                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
 946                         dev_dbg(dev, "Number of data bits requested not supported by device\n");
 947         }
 948
 949         if ((cflag     & (PARENB|PARODD|CMSPAR)) !=
 950             (old_cflag & (PARENB|PARODD|CMSPAR))) {
 951                 cp210x_get_line_ctl(port, &bits);
 952                 bits &= ~BITS_PARITY_MASK;
 953                 if (cflag & PARENB) {
 954                         if (cflag & CMSPAR) {
 955                                 if (cflag & PARODD) {
 956                                         bits |= BITS_PARITY_MARK;
 957                                         dev_dbg(dev, "%s - parity = MARK\n", __func__);
 958                                 } else {
 959                                         bits |= BITS_PARITY_SPACE;
 960                                         dev_dbg(dev, "%s - parity = SPACE\n", __func__);
 961                                 }
 962                         } else {
 963                                 if (cflag & PARODD) {
 964                                         bits |= BITS_PARITY_ODD;
 965                                         dev_dbg(dev, "%s - parity = ODD\n", __func__);
 966                                 } else {
 967                                         bits |= BITS_PARITY_EVEN;
 968                                         dev_dbg(dev, "%s - parity = EVEN\n", __func__);
 969                                 }
 970                         }
 971                 }
 972                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
 973                         dev_dbg(dev, "Parity mode not supported by device\n");
 974         }
 975
 976         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 977                 cp210x_get_line_ctl(port, &bits);
 978                 bits &= ~BITS_STOP_MASK;
 979                 if (cflag & CSTOPB) {
 980                         bits |= BITS_STOP_2;
 981                         dev_dbg(dev, "%s - stop bits = 2\n", __func__);
 982                 } else {
 983                         bits |= BITS_STOP_1;
 984                         dev_dbg(dev, "%s - stop bits = 1\n", __func__);
 985                 }
 986                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
 987                         dev_dbg(dev, "Number of stop bits requested not supported by device\n");
 988         }
 989
 990         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 991                 struct cp210x_flow_ctl flow_ctl;
 992                 u32 ctl_hs;
 993                 u32 flow_repl;
 994
 995                 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
 996                                 sizeof(flow_ctl));
 997                 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
 998                 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
 999                 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1000                                 __func__, ctl_hs, flow_repl);
1001
1002                 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1003                 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1004                 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1005                 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1006                 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1007                 if (cflag & CRTSCTS) {
1008                         ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1009
1010                         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1011                         flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1012                                         CP210X_SERIAL_RTS_FLOW_CTL);
1013                         dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1014                 } else {
1015                         ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1016
1017                         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1018                         flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1019                                         CP210X_SERIAL_RTS_ACTIVE);
1020                         dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1021                 }
1022
1023                 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1024                                 __func__, ctl_hs, flow_repl);
1025                 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1026                 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1027                 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1028                                 sizeof(flow_ctl));
1029         }
1030
1031 }
1032
1033 static int cp210x_tiocmset(struct tty_struct *tty,
1034                 unsigned int set, unsigned int clear)
1035 {
1036         struct usb_serial_port *port = tty->driver_data;
1037         return cp210x_tiocmset_port(port, set, clear);
1038 }
1039
1040 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1041                 unsigned int set, unsigned int clear)
1042 {
1043         u16 control = 0;
1044
1045         if (set & TIOCM_RTS) {
1046                 control |= CONTROL_RTS;
1047                 control |= CONTROL_WRITE_RTS;
1048         }
1049         if (set & TIOCM_DTR) {
1050                 control |= CONTROL_DTR;
1051                 control |= CONTROL_WRITE_DTR;
1052         }
1053         if (clear & TIOCM_RTS) {
1054                 control &= ~CONTROL_RTS;
1055                 control |= CONTROL_WRITE_RTS;
1056         }
1057         if (clear & TIOCM_DTR) {
1058                 control &= ~CONTROL_DTR;
1059                 control |= CONTROL_WRITE_DTR;
1060         }
1061
1062         dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1063
1064         return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1065 }
1066
1067 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1068 {
1069         if (on)
1070                 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1071         else
1072                 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1073 }
1074
1075 static int cp210x_tiocmget(struct tty_struct *tty)
1076 {
1077         struct usb_serial_port *port = tty->driver_data;
1078         u8 control;
1079         int result;
1080
1081         result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1082         if (result)
1083                 return result;
1084
1085         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1086                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1087                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1088                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1089                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
1090                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
1091
1092         dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1093
1094         return result;
1095 }
1096
1097 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1098 {
1099         struct usb_serial_port *port = tty->driver_data;
1100         u16 state;
1101
1102         if (break_state == 0)
1103                 state = BREAK_OFF;
1104         else
1105                 state = BREAK_ON;
1106         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1107                 state == BREAK_OFF ? "off" : "on");
1108         cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1109 }
1110
1111 static int cp210x_port_probe(struct usb_serial_port *port)
1112 {
1113         struct usb_serial *serial = port->serial;
1114         struct usb_host_interface *cur_altsetting;
1115         struct cp210x_port_private *port_priv;
1116         int ret;
1117
1118         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1119         if (!port_priv)
1120                 return -ENOMEM;
1121
1122         cur_altsetting = serial->interface->cur_altsetting;
1123         port_priv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber;
1124
1125         usb_set_serial_port_data(port, port_priv);
1126
1127         ret = cp210x_detect_swapped_line_ctl(port);
1128         if (ret) {
1129                 kfree(port_priv);
1130                 return ret;
1131         }
1132
1133         return 0;
1134 }
1135
1136 static int cp210x_port_remove(struct usb_serial_port *port)
1137 {
1138         struct cp210x_port_private *port_priv;
1139
1140         port_priv = usb_get_serial_port_data(port);
1141         kfree(port_priv);
1142
1143         return 0;
1144 }
1145
1146 module_usb_serial_driver(serial_drivers, id_table);
1147
1148 MODULE_DESCRIPTION(DRIVER_DESC);
1149 MODULE_LICENSE("GPL");