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 #include <linux/gpio/driver.h>
  27 #include <linux/bitops.h>
  28 #include <linux/mutex.h>
  29
  30 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
  31
  32 /*
  33  * Function Prototypes
  34  */
  35 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
  36 static void cp210x_close(struct usb_serial_port *);
  37 static void cp210x_get_termios(struct tty_struct *, struct usb_serial_port *);
  38 static void cp210x_get_termios_port(struct usb_serial_port *port,
  39         tcflag_t *cflagp, unsigned int *baudp);
  40 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
  41                                                         struct ktermios *);
  42 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
  43                                                         struct ktermios*);
  44 static bool cp210x_tx_empty(struct usb_serial_port *port);
  45 static int cp210x_tiocmget(struct tty_struct *);
  46 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
  47 static int cp210x_tiocmset_port(struct usb_serial_port *port,
  48                 unsigned int, unsigned int);
  49 static void cp210x_break_ctl(struct tty_struct *, int);
  50 static int cp210x_attach(struct usb_serial *);
  51 static void cp210x_disconnect(struct usb_serial *);
  52 static void cp210x_release(struct usb_serial *);
  53 static int cp210x_port_probe(struct usb_serial_port *);
  54 static int cp210x_port_remove(struct usb_serial_port *);
  55 static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
  56
  57 static const struct usb_device_id id_table[] = {
  58         { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
  59         { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
  60         { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  61         { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  62         { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
  63         { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
  64         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
  65         { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
  66         { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
  67         { USB_DEVICE(0x0988, 0x0578) }, /* Teraoka AD2000 */
  68         { USB_DEVICE(0x0B00, 0x3070) }, /* Ingenico 3070 */
  69         { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
  70         { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
  71         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  72         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
  73         { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
  74         { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
  75         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  76         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  77         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  78         { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
  79         { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
  80         { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
  81         { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
  82         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  83         { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
  84         { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
  85         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
  86         { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
  87         { USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */
  88         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  89         { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
  90         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  91         { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
  92         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  93         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
  94         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  95         { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
  96         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  97         { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
  98         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
  99         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
 100         { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
 101         { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
 102         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
 103         { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
 104         { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */
 105         { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */
 106         { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */
 107         { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
 108         { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
 109         { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
 110         { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
 111         { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
 112         { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
 113         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
 114         { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
 115         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
 116         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
 117         { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
 118         { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
 119         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
 120         { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
 121         { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
 122         { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
 123         { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
 124         { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */
 125         { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */
 126         { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */
 127         { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
 128         { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
 129         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
 130         { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
 131         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
 132         { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */
 133         { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
 134         { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
 135         { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
 136         { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
 137         { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
 138         { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
 139         { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
 140         { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */
 141         { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */
 142         { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */
 143         { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
 144         { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
 145         { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
 146         { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
 147         { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
 148         { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
 149         { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
 150         { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
 151         { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
 152         { USB_DEVICE(0x10C4, 0x88D8) }, /* Acuity Brands nLight Air Adapter */
 153         { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */
 154         { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */
 155         { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
 156         { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
 157         { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
 158         { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
 159         { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */
 160         { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */
 161         { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
 162         { USB_DEVICE(0x10C4, 0x8A5B) }, /* CEL EM3588 ZigBee USB Stick */
 163         { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
 164         { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
 165         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 166         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 167         { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */
 168         { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
 169         { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
 170         { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */
 171         { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */
 172         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 173         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 174         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 175         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 176         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 177         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 178         { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
 179         { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
 180         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 181         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 182         { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */
 183         { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
 184         { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
 185         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 186         { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
 187         { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
 188         { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
 189         { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
 190         { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
 191         { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
 192         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 193         { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
 194         { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
 195         { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
 196         { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
 197         { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
 198         { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
 199         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
 200         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
 201         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 202         { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
 203         { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
 204         { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
 205         { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
 206         { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
 207         { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
 208         { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
 209         { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
 210         { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 M.2 Key E serial interface */
 211         { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 Display serial interface */
 212         { USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */
 213         { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
 214         { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
 215         { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
 216         { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
 217         { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
 218         { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
 219         { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
 220         { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
 221         { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
 222         { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
 223         { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
 224         { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
 225         { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
 226         { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
 227         { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
 228         { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
 229         { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
 230         { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
 231         { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
 232         { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
 233         { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
 234         { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
 235         { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
 236         { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
 237         { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
 238         { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
 239         { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
 240         { USB_DEVICE(0x2184, 0x0030) }, /* GW Instek GDM-834x Digital Multimeter */
 241         { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
 242         { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
 243         { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
 244         { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
 245         { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
 246         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 247         { } /* Terminating Entry */
 248 };
 249
 250 MODULE_DEVICE_TABLE(usb, id_table);
 251
 252 struct cp210x_serial_private {
 253 #ifdef CONFIG_GPIOLIB
 254         struct gpio_chip        gc;
 255         u8                      config;
 256         u8                      gpio_mode;
 257         bool                    gpio_registered;
 258 #endif
 259         u8                      partnum;
 260 };
 261
 262 struct cp210x_port_private {
 263         __u8                    bInterfaceNumber;
 264         bool                    has_swapped_line_ctl;
 265 };
 266
 267 static struct usb_serial_driver cp210x_device = {
 268         .driver = {
 269                 .owner =        THIS_MODULE,
 270                 .name =         "cp210x",
 271         },
 272         .id_table               = id_table,
 273         .num_ports              = 1,
 274         .bulk_in_size           = 256,
 275         .bulk_out_size          = 256,
 276         .open                   = cp210x_open,
 277         .close                  = cp210x_close,
 278         .break_ctl              = cp210x_break_ctl,
 279         .set_termios            = cp210x_set_termios,
 280         .tx_empty               = cp210x_tx_empty,
 281         .throttle               = usb_serial_generic_throttle,
 282         .unthrottle             = usb_serial_generic_unthrottle,
 283         .tiocmget               = cp210x_tiocmget,
 284         .tiocmset               = cp210x_tiocmset,
 285         .attach                 = cp210x_attach,
 286         .disconnect             = cp210x_disconnect,
 287         .release                = cp210x_release,
 288         .port_probe             = cp210x_port_probe,
 289         .port_remove            = cp210x_port_remove,
 290         .dtr_rts                = cp210x_dtr_rts
 291 };
 292
 293 static struct usb_serial_driver * const serial_drivers[] = {
 294         &cp210x_device, NULL
 295 };
 296
 297 /* Config request types */
 298 #define REQTYPE_HOST_TO_INTERFACE       0x41
 299 #define REQTYPE_INTERFACE_TO_HOST       0xc1
 300 #define REQTYPE_HOST_TO_DEVICE  0x40
 301 #define REQTYPE_DEVICE_TO_HOST  0xc0
 302
 303 /* Config request codes */
 304 #define CP210X_IFC_ENABLE       0x00
 305 #define CP210X_SET_BAUDDIV      0x01
 306 #define CP210X_GET_BAUDDIV      0x02
 307 #define CP210X_SET_LINE_CTL     0x03
 308 #define CP210X_GET_LINE_CTL     0x04
 309 #define CP210X_SET_BREAK        0x05
 310 #define CP210X_IMM_CHAR         0x06
 311 #define CP210X_SET_MHS          0x07
 312 #define CP210X_GET_MDMSTS       0x08
 313 #define CP210X_SET_XON          0x09
 314 #define CP210X_SET_XOFF         0x0A
 315 #define CP210X_SET_EVENTMASK    0x0B
 316 #define CP210X_GET_EVENTMASK    0x0C
 317 #define CP210X_SET_CHAR         0x0D
 318 #define CP210X_GET_CHARS        0x0E
 319 #define CP210X_GET_PROPS        0x0F
 320 #define CP210X_GET_COMM_STATUS  0x10
 321 #define CP210X_RESET            0x11
 322 #define CP210X_PURGE            0x12
 323 #define CP210X_SET_FLOW         0x13
 324 #define CP210X_GET_FLOW         0x14
 325 #define CP210X_EMBED_EVENTS     0x15
 326 #define CP210X_GET_EVENTSTATE   0x16
 327 #define CP210X_SET_CHARS        0x19
 328 #define CP210X_GET_BAUDRATE     0x1D
 329 #define CP210X_SET_BAUDRATE     0x1E
 330 #define CP210X_VENDOR_SPECIFIC  0xFF
 331
 332 /* CP210X_IFC_ENABLE */
 333 #define UART_ENABLE             0x0001
 334 #define UART_DISABLE            0x0000
 335
 336 /* CP210X_(SET|GET)_BAUDDIV */
 337 #define BAUD_RATE_GEN_FREQ      0x384000
 338
 339 /* CP210X_(SET|GET)_LINE_CTL */
 340 #define BITS_DATA_MASK          0X0f00
 341 #define BITS_DATA_5             0X0500
 342 #define BITS_DATA_6             0X0600
 343 #define BITS_DATA_7             0X0700
 344 #define BITS_DATA_8             0X0800
 345 #define BITS_DATA_9             0X0900
 346
 347 #define BITS_PARITY_MASK        0x00f0
 348 #define BITS_PARITY_NONE        0x0000
 349 #define BITS_PARITY_ODD         0x0010
 350 #define BITS_PARITY_EVEN        0x0020
 351 #define BITS_PARITY_MARK        0x0030
 352 #define BITS_PARITY_SPACE       0x0040
 353
 354 #define BITS_STOP_MASK          0x000f
 355 #define BITS_STOP_1             0x0000
 356 #define BITS_STOP_1_5           0x0001
 357 #define BITS_STOP_2             0x0002
 358
 359 /* CP210X_SET_BREAK */
 360 #define BREAK_ON                0x0001
 361 #define BREAK_OFF               0x0000
 362
 363 /* CP210X_(SET_MHS|GET_MDMSTS) */
 364 #define CONTROL_DTR             0x0001
 365 #define CONTROL_RTS             0x0002
 366 #define CONTROL_CTS             0x0010
 367 #define CONTROL_DSR             0x0020
 368 #define CONTROL_RING            0x0040
 369 #define CONTROL_DCD             0x0080
 370 #define CONTROL_WRITE_DTR       0x0100
 371 #define CONTROL_WRITE_RTS       0x0200
 372
 373 /* CP210X_VENDOR_SPECIFIC values */
 374 #define CP210X_READ_LATCH       0x00C2
 375 #define CP210X_GET_PARTNUM      0x370B
 376 #define CP210X_GET_PORTCONFIG   0x370C
 377 #define CP210X_GET_DEVICEMODE   0x3711
 378 #define CP210X_WRITE_LATCH      0x37E1
 379
 380 /* Part number definitions */
 381 #define CP210X_PARTNUM_CP2101   0x01
 382 #define CP210X_PARTNUM_CP2102   0x02
 383 #define CP210X_PARTNUM_CP2103   0x03
 384 #define CP210X_PARTNUM_CP2104   0x04
 385 #define CP210X_PARTNUM_CP2105   0x05
 386 #define CP210X_PARTNUM_CP2108   0x08
 387 #define CP210X_PARTNUM_UNKNOWN  0xFF
 388
 389 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
 390 struct cp210x_comm_status {
 391         __le32   ulErrors;
 392         __le32   ulHoldReasons;
 393         __le32   ulAmountInInQueue;
 394         __le32   ulAmountInOutQueue;
 395         u8       bEofReceived;
 396         u8       bWaitForImmediate;
 397         u8       bReserved;
 398 } __packed;
 399
 400 /*
 401  * CP210X_PURGE - 16 bits passed in wValue of USB request.
 402  * SiLabs app note AN571 gives a strange description of the 4 bits:
 403  * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
 404  * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
 405  */
 406 #define PURGE_ALL               0x000f
 407
 408 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
 409 struct cp210x_flow_ctl {
 410         __le32  ulControlHandshake;
 411         __le32  ulFlowReplace;
 412         __le32  ulXonLimit;
 413         __le32  ulXoffLimit;
 414 } __packed;
 415
 416 /* cp210x_flow_ctl::ulControlHandshake */
 417 #define CP210X_SERIAL_DTR_MASK          GENMASK(1, 0)
 418 #define CP210X_SERIAL_DTR_SHIFT(_mode)  (_mode)
 419 #define CP210X_SERIAL_CTS_HANDSHAKE     BIT(3)
 420 #define CP210X_SERIAL_DSR_HANDSHAKE     BIT(4)
 421 #define CP210X_SERIAL_DCD_HANDSHAKE     BIT(5)
 422 #define CP210X_SERIAL_DSR_SENSITIVITY   BIT(6)
 423
 424 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
 425 #define CP210X_SERIAL_DTR_INACTIVE      0
 426 #define CP210X_SERIAL_DTR_ACTIVE        1
 427 #define CP210X_SERIAL_DTR_FLOW_CTL      2
 428
 429 /* cp210x_flow_ctl::ulFlowReplace */
 430 #define CP210X_SERIAL_AUTO_TRANSMIT     BIT(0)
 431 #define CP210X_SERIAL_AUTO_RECEIVE      BIT(1)
 432 #define CP210X_SERIAL_ERROR_CHAR        BIT(2)
 433 #define CP210X_SERIAL_NULL_STRIPPING    BIT(3)
 434 #define CP210X_SERIAL_BREAK_CHAR        BIT(4)
 435 #define CP210X_SERIAL_RTS_MASK          GENMASK(7, 6)
 436 #define CP210X_SERIAL_RTS_SHIFT(_mode)  (_mode << 6)
 437 #define CP210X_SERIAL_XOFF_CONTINUE     BIT(31)
 438
 439 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
 440 #define CP210X_SERIAL_RTS_INACTIVE      0
 441 #define CP210X_SERIAL_RTS_ACTIVE        1
 442 #define CP210X_SERIAL_RTS_FLOW_CTL      2
 443
 444 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
 445 struct cp210x_pin_mode {
 446         u8      eci;
 447         u8      sci;
 448 } __packed;
 449
 450 #define CP210X_PIN_MODE_MODEM           0
 451 #define CP210X_PIN_MODE_GPIO            BIT(0)
 452
 453 /*
 454  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes.
 455  * Structure needs padding due to unused/unspecified bytes.
 456  */
 457 struct cp210x_config {
 458         __le16  gpio_mode;
 459         u8      __pad0[2];
 460         __le16  reset_state;
 461         u8      __pad1[4];
 462         __le16  suspend_state;
 463         u8      sci_cfg;
 464         u8      eci_cfg;
 465         u8      device_cfg;
 466 } __packed;
 467
 468 /* GPIO modes */
 469 #define CP210X_SCI_GPIO_MODE_OFFSET     9
 470 #define CP210X_SCI_GPIO_MODE_MASK       GENMASK(11, 9)
 471
 472 #define CP210X_ECI_GPIO_MODE_OFFSET     2
 473 #define CP210X_ECI_GPIO_MODE_MASK       GENMASK(3, 2)
 474
 475 /* CP2105 port configuration values */
 476 #define CP2105_GPIO0_TXLED_MODE         BIT(0)
 477 #define CP2105_GPIO1_RXLED_MODE         BIT(1)
 478 #define CP2105_GPIO1_RS485_MODE         BIT(2)
 479
 480 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
 481 struct cp210x_gpio_write {
 482         u8      mask;
 483         u8      state;
 484 } __packed;
 485
 486 /*
 487  * Helper to get interface number when we only have struct usb_serial.
 488  */
 489 static u8 cp210x_interface_num(struct usb_serial *serial)
 490 {
 491         struct usb_host_interface *cur_altsetting;
 492
 493         cur_altsetting = serial->interface->cur_altsetting;
 494
 495         return cur_altsetting->desc.bInterfaceNumber;
 496 }
 497
 498 /*
 499  * Reads a variable-sized block of CP210X_ registers, identified by req.
 500  * Returns data into buf in native USB byte order.
 501  */
 502 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
 503                 void *buf, int bufsize)
 504 {
 505         struct usb_serial *serial = port->serial;
 506         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 507         void *dmabuf;
 508         int result;
 509
 510         dmabuf = kmalloc(bufsize, GFP_KERNEL);
 511         if (!dmabuf) {
 512                 /*
 513                  * FIXME Some callers don't bother to check for error,
 514                  * at least give them consistent junk until they are fixed
 515                  */
 516                 memset(buf, 0, bufsize);
 517                 return -ENOMEM;
 518         }
 519
 520         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 521                         req, REQTYPE_INTERFACE_TO_HOST, 0,
 522                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 523                         USB_CTRL_SET_TIMEOUT);
 524         if (result == bufsize) {
 525                 memcpy(buf, dmabuf, bufsize);
 526                 result = 0;
 527         } else {
 528                 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
 529                                 req, bufsize, result);
 530                 if (result >= 0)
 531                         result = -EIO;
 532
 533                 /*
 534                  * FIXME Some callers don't bother to check for error,
 535                  * at least give them consistent junk until they are fixed
 536                  */
 537                 memset(buf, 0, bufsize);
 538         }
 539
 540         kfree(dmabuf);
 541
 542         return result;
 543 }
 544
 545 /*
 546  * Reads any 32-bit CP210X_ register identified by req.
 547  */
 548 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
 549 {
 550         __le32 le32_val;
 551         int err;
 552
 553         err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
 554         if (err) {
 555                 /*
 556                  * FIXME Some callers don't bother to check for error,
 557                  * at least give them consistent junk until they are fixed
 558                  */
 559                 *val = 0;
 560                 return err;
 561         }
 562
 563         *val = le32_to_cpu(le32_val);
 564
 565         return 0;
 566 }
 567
 568 /*
 569  * Reads any 16-bit CP210X_ register identified by req.
 570  */
 571 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
 572 {
 573         __le16 le16_val;
 574         int err;
 575
 576         err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
 577         if (err)
 578                 return err;
 579
 580         *val = le16_to_cpu(le16_val);
 581
 582         return 0;
 583 }
 584
 585 /*
 586  * Reads any 8-bit CP210X_ register identified by req.
 587  */
 588 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
 589 {
 590         return cp210x_read_reg_block(port, req, val, sizeof(*val));
 591 }
 592
 593 /*
 594  * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
 595  * Returns data into buf in native USB byte order.
 596  */
 597 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
 598                                     void *buf, int bufsize)
 599 {
 600         void *dmabuf;
 601         int result;
 602
 603         dmabuf = kmalloc(bufsize, GFP_KERNEL);
 604         if (!dmabuf)
 605                 return -ENOMEM;
 606
 607         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 608                                  CP210X_VENDOR_SPECIFIC, type, val,
 609                                  cp210x_interface_num(serial), dmabuf, bufsize,
 610                                  USB_CTRL_GET_TIMEOUT);
 611         if (result == bufsize) {
 612                 memcpy(buf, dmabuf, bufsize);
 613                 result = 0;
 614         } else {
 615                 dev_err(&serial->interface->dev,
 616                         "failed to get vendor val 0x%04x size %d: %d\n", val,
 617                         bufsize, result);
 618                 if (result >= 0)
 619                         result = -EIO;
 620         }
 621
 622         kfree(dmabuf);
 623
 624         return result;
 625 }
 626
 627 /*
 628  * Writes any 16-bit CP210X_ register (req) whose value is passed
 629  * entirely in the wValue field of the USB request.
 630  */
 631 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
 632 {
 633         struct usb_serial *serial = port->serial;
 634         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 635         int result;
 636
 637         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 638                         req, REQTYPE_HOST_TO_INTERFACE, val,
 639                         port_priv->bInterfaceNumber, NULL, 0,
 640                         USB_CTRL_SET_TIMEOUT);
 641         if (result < 0) {
 642                 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
 643                                 req, result);
 644         }
 645
 646         return result;
 647 }
 648
 649 /*
 650  * Writes a variable-sized block of CP210X_ registers, identified by req.
 651  * Data in buf must be in native USB byte order.
 652  */
 653 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
 654                 void *buf, int bufsize)
 655 {
 656         struct usb_serial *serial = port->serial;
 657         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 658         void *dmabuf;
 659         int result;
 660
 661         dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
 662         if (!dmabuf)
 663                 return -ENOMEM;
 664
 665         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 666                         req, REQTYPE_HOST_TO_INTERFACE, 0,
 667                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 668                         USB_CTRL_SET_TIMEOUT);
 669
 670         kfree(dmabuf);
 671
 672         if (result == bufsize) {
 673                 result = 0;
 674         } else {
 675                 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
 676                                 req, bufsize, result);
 677                 if (result >= 0)
 678                         result = -EIO;
 679         }
 680
 681         return result;
 682 }
 683
 684 /*
 685  * Writes any 32-bit CP210X_ register identified by req.
 686  */
 687 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
 688 {
 689         __le32 le32_val;
 690
 691         le32_val = cpu_to_le32(val);
 692
 693         return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
 694 }
 695
 696 #ifdef CONFIG_GPIOLIB
 697 /*
 698  * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
 699  * Data in buf must be in native USB byte order.
 700  */
 701 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
 702                                      u16 val, void *buf, int bufsize)
 703 {
 704         void *dmabuf;
 705         int result;
 706
 707         dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
 708         if (!dmabuf)
 709                 return -ENOMEM;
 710
 711         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 712                                  CP210X_VENDOR_SPECIFIC, type, val,
 713                                  cp210x_interface_num(serial), dmabuf, bufsize,
 714                                  USB_CTRL_SET_TIMEOUT);
 715
 716         kfree(dmabuf);
 717
 718         if (result == bufsize) {
 719                 result = 0;
 720         } else {
 721                 dev_err(&serial->interface->dev,
 722                         "failed to set vendor val 0x%04x size %d: %d\n", val,
 723                         bufsize, result);
 724                 if (result >= 0)
 725                         result = -EIO;
 726         }
 727
 728         return result;
 729 }
 730 #endif
 731
 732 /*
 733  * Detect CP2108 GET_LINE_CTL bug and activate workaround.
 734  * Write a known good value 0x800, read it back.
 735  * If it comes back swapped the bug is detected.
 736  * Preserve the original register value.
 737  */
 738 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
 739 {
 740         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 741         u16 line_ctl_save;
 742         u16 line_ctl_test;
 743         int err;
 744
 745         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
 746         if (err)
 747                 return err;
 748
 749         err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
 750         if (err)
 751                 return err;
 752
 753         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
 754         if (err)
 755                 return err;
 756
 757         if (line_ctl_test == 8) {
 758                 port_priv->has_swapped_line_ctl = true;
 759                 line_ctl_save = swab16(line_ctl_save);
 760         }
 761
 762         return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
 763 }
 764
 765 /*
 766  * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
 767  * to workaround cp2108 bug and get correct value.
 768  */
 769 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
 770 {
 771         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 772         int err;
 773
 774         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
 775         if (err)
 776                 return err;
 777
 778         /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
 779         if (port_priv->has_swapped_line_ctl)
 780                 *ctl = swab16(*ctl);
 781
 782         return 0;
 783 }
 784
 785 /*
 786  * cp210x_quantise_baudrate
 787  * Quantises the baud rate as per AN205 Table 1
 788  */
 789 static unsigned int cp210x_quantise_baudrate(unsigned int baud)
 790 {
 791         if (baud <= 300)
 792                 baud = 300;
 793         else if (baud <= 600)      baud = 600;
 794         else if (baud <= 1200)     baud = 1200;
 795         else if (baud <= 1800)     baud = 1800;
 796         else if (baud <= 2400)     baud = 2400;
 797         else if (baud <= 4000)     baud = 4000;
 798         else if (baud <= 4803)     baud = 4800;
 799         else if (baud <= 7207)     baud = 7200;
 800         else if (baud <= 9612)     baud = 9600;
 801         else if (baud <= 14428)    baud = 14400;
 802         else if (baud <= 16062)    baud = 16000;
 803         else if (baud <= 19250)    baud = 19200;
 804         else if (baud <= 28912)    baud = 28800;
 805         else if (baud <= 38601)    baud = 38400;
 806         else if (baud <= 51558)    baud = 51200;
 807         else if (baud <= 56280)    baud = 56000;
 808         else if (baud <= 58053)    baud = 57600;
 809         else if (baud <= 64111)    baud = 64000;
 810         else if (baud <= 77608)    baud = 76800;
 811         else if (baud <= 117028)   baud = 115200;
 812         else if (baud <= 129347)   baud = 128000;
 813         else if (baud <= 156868)   baud = 153600;
 814         else if (baud <= 237832)   baud = 230400;
 815         else if (baud <= 254234)   baud = 250000;
 816         else if (baud <= 273066)   baud = 256000;
 817         else if (baud <= 491520)   baud = 460800;
 818         else if (baud <= 567138)   baud = 500000;
 819         else if (baud <= 670254)   baud = 576000;
 820         else if (baud < 1000000)
 821                 baud = 921600;
 822         else if (baud > 2000000)
 823                 baud = 2000000;
 824         return baud;
 825 }
 826
 827 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 828 {
 829         int result;
 830
 831         result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
 832         if (result) {
 833                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
 834                 return result;
 835         }
 836
 837         /* Configure the termios structure */
 838         cp210x_get_termios(tty, port);
 839
 840         /* The baud rate must be initialised on cp2104 */
 841         if (tty)
 842                 cp210x_change_speed(tty, port, NULL);
 843
 844         return usb_serial_generic_open(tty, port);
 845 }
 846
 847 static void cp210x_close(struct usb_serial_port *port)
 848 {
 849         usb_serial_generic_close(port);
 850
 851         /* Clear both queues; cp2108 needs this to avoid an occasional hang */
 852         cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
 853
 854         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 855 }
 856
 857 /*
 858  * Read how many bytes are waiting in the TX queue.
 859  */
 860 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
 861                 u32 *count)
 862 {
 863         struct usb_serial *serial = port->serial;
 864         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 865         struct cp210x_comm_status *sts;
 866         int result;
 867
 868         sts = kmalloc(sizeof(*sts), GFP_KERNEL);
 869         if (!sts)
 870                 return -ENOMEM;
 871
 872         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 873                         CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
 874                         0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
 875                         USB_CTRL_GET_TIMEOUT);
 876         if (result == sizeof(*sts)) {
 877                 *count = le32_to_cpu(sts->ulAmountInOutQueue);
 878                 result = 0;
 879         } else {
 880                 dev_err(&port->dev, "failed to get comm status: %d\n", result);
 881                 if (result >= 0)
 882                         result = -EIO;
 883         }
 884
 885         kfree(sts);
 886
 887         return result;
 888 }
 889
 890 static bool cp210x_tx_empty(struct usb_serial_port *port)
 891 {
 892         int err;
 893         u32 count;
 894
 895         err = cp210x_get_tx_queue_byte_count(port, &count);
 896         if (err)
 897                 return true;
 898
 899         return !count;
 900 }
 901
 902 /*
 903  * cp210x_get_termios
 904  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 905  * from the device, corrects any unsupported values, and configures the
 906  * termios structure to reflect the state of the device
 907  */
 908 static void cp210x_get_termios(struct tty_struct *tty,
 909         struct usb_serial_port *port)
 910 {
 911         unsigned int baud;
 912
 913         if (tty) {
 914                 cp210x_get_termios_port(tty->driver_data,
 915                         &tty->termios.c_cflag, &baud);
 916                 tty_encode_baud_rate(tty, baud, baud);
 917         } else {
 918                 tcflag_t cflag;
 919                 cflag = 0;
 920                 cp210x_get_termios_port(port, &cflag, &baud);
 921         }
 922 }
 923
 924 /*
 925  * cp210x_get_termios_port
 926  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
 927  */
 928 static void cp210x_get_termios_port(struct usb_serial_port *port,
 929         tcflag_t *cflagp, unsigned int *baudp)
 930 {
 931         struct device *dev = &port->dev;
 932         tcflag_t cflag;
 933         struct cp210x_flow_ctl flow_ctl;
 934         u32 baud;
 935         u16 bits;
 936         u32 ctl_hs;
 937         u32 flow_repl;
 938
 939         cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
 940
 941         dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
 942         *baudp = baud;
 943
 944         cflag = *cflagp;
 945
 946         cp210x_get_line_ctl(port, &bits);
 947         cflag &= ~CSIZE;
 948         switch (bits & BITS_DATA_MASK) {
 949         case BITS_DATA_5:
 950                 dev_dbg(dev, "%s - data bits = 5\n", __func__);
 951                 cflag |= CS5;
 952                 break;
 953         case BITS_DATA_6:
 954                 dev_dbg(dev, "%s - data bits = 6\n", __func__);
 955                 cflag |= CS6;
 956                 break;
 957         case BITS_DATA_7:
 958                 dev_dbg(dev, "%s - data bits = 7\n", __func__);
 959                 cflag |= CS7;
 960                 break;
 961         case BITS_DATA_8:
 962                 dev_dbg(dev, "%s - data bits = 8\n", __func__);
 963                 cflag |= CS8;
 964                 break;
 965         case BITS_DATA_9:
 966                 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
 967                 cflag |= CS8;
 968                 bits &= ~BITS_DATA_MASK;
 969                 bits |= BITS_DATA_8;
 970                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 971                 break;
 972         default:
 973                 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
 974                 cflag |= CS8;
 975                 bits &= ~BITS_DATA_MASK;
 976                 bits |= BITS_DATA_8;
 977                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 978                 break;
 979         }
 980
 981         switch (bits & BITS_PARITY_MASK) {
 982         case BITS_PARITY_NONE:
 983                 dev_dbg(dev, "%s - parity = NONE\n", __func__);
 984                 cflag &= ~PARENB;
 985                 break;
 986         case BITS_PARITY_ODD:
 987                 dev_dbg(dev, "%s - parity = ODD\n", __func__);
 988                 cflag |= (PARENB|PARODD);
 989                 break;
 990         case BITS_PARITY_EVEN:
 991                 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
 992                 cflag &= ~PARODD;
 993                 cflag |= PARENB;
 994                 break;
 995         case BITS_PARITY_MARK:
 996                 dev_dbg(dev, "%s - parity = MARK\n", __func__);
 997                 cflag |= (PARENB|PARODD|CMSPAR);
 998                 break;
 999         case BITS_PARITY_SPACE:
1000                 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1001                 cflag &= ~PARODD;
1002                 cflag |= (PARENB|CMSPAR);
1003                 break;
1004         default:
1005                 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
1006                 cflag &= ~PARENB;
1007                 bits &= ~BITS_PARITY_MASK;
1008                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1009                 break;
1010         }
1011
1012         cflag &= ~CSTOPB;
1013         switch (bits & BITS_STOP_MASK) {
1014         case BITS_STOP_1:
1015                 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1016                 break;
1017         case BITS_STOP_1_5:
1018                 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
1019                 bits &= ~BITS_STOP_MASK;
1020                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1021                 break;
1022         case BITS_STOP_2:
1023                 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1024                 cflag |= CSTOPB;
1025                 break;
1026         default:
1027                 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
1028                 bits &= ~BITS_STOP_MASK;
1029                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1030                 break;
1031         }
1032
1033         cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1034                         sizeof(flow_ctl));
1035         ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1036         if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
1037                 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1038                 /*
1039                  * When the port is closed, the CP210x hardware disables
1040                  * auto-RTS and RTS is deasserted but it leaves auto-CTS when
1041                  * in hardware flow control mode. When re-opening the port, if
1042                  * auto-CTS is enabled on the cp210x, then auto-RTS must be
1043                  * re-enabled in the driver.
1044                  */
1045                 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1046                 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1047                 flow_repl |= CP210X_SERIAL_RTS_SHIFT(CP210X_SERIAL_RTS_FLOW_CTL);
1048                 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1049                 cp210x_write_reg_block(port,
1050                                 CP210X_SET_FLOW,
1051                                 &flow_ctl,
1052                                 sizeof(flow_ctl));
1053
1054                 cflag |= CRTSCTS;
1055         } else {
1056                 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1057                 cflag &= ~CRTSCTS;
1058         }
1059
1060         *cflagp = cflag;
1061 }
1062
1063 /*
1064  * CP2101 supports the following baud rates:
1065  *
1066  *      300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1067  *      38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1068  *
1069  * CP2102 and CP2103 support the following additional rates:
1070  *
1071  *      4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1072  *      576000
1073  *
1074  * The device will map a requested rate to a supported one, but the result
1075  * of requests for rates greater than 1053257 is undefined (see AN205).
1076  *
1077  * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1078  * respectively, with an error less than 1%. The actual rates are determined
1079  * by
1080  *
1081  *      div = round(freq / (2 x prescale x request))
1082  *      actual = freq / (2 x prescale x div)
1083  *
1084  * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1085  * or 1 otherwise.
1086  * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1087  * otherwise.
1088  */
1089 static void cp210x_change_speed(struct tty_struct *tty,
1090                 struct usb_serial_port *port, struct ktermios *old_termios)
1091 {
1092         u32 baud;
1093
1094         baud = tty->termios.c_ospeed;
1095
1096         /* This maps the requested rate to a rate valid on cp2102 or cp2103,
1097          * or to an arbitrary rate in [1M,2M].
1098          *
1099          * NOTE: B0 is not implemented.
1100          */
1101         baud = cp210x_quantise_baudrate(baud);
1102
1103         dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1104         if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1105                 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1106                 if (old_termios)
1107                         baud = old_termios->c_ospeed;
1108                 else
1109                         baud = 9600;
1110         }
1111
1112         tty_encode_baud_rate(tty, baud, baud);
1113 }
1114
1115 static void cp210x_set_termios(struct tty_struct *tty,
1116                 struct usb_serial_port *port, struct ktermios *old_termios)
1117 {
1118         struct device *dev = &port->dev;
1119         unsigned int cflag, old_cflag;
1120         u16 bits;
1121
1122         cflag = tty->termios.c_cflag;
1123         old_cflag = old_termios->c_cflag;
1124
1125         if (tty->termios.c_ospeed != old_termios->c_ospeed)
1126                 cp210x_change_speed(tty, port, old_termios);
1127
1128         /* If the number of data bits is to be updated */
1129         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
1130                 cp210x_get_line_ctl(port, &bits);
1131                 bits &= ~BITS_DATA_MASK;
1132                 switch (cflag & CSIZE) {
1133                 case CS5:
1134                         bits |= BITS_DATA_5;
1135                         dev_dbg(dev, "%s - data bits = 5\n", __func__);
1136                         break;
1137                 case CS6:
1138                         bits |= BITS_DATA_6;
1139                         dev_dbg(dev, "%s - data bits = 6\n", __func__);
1140                         break;
1141                 case CS7:
1142                         bits |= BITS_DATA_7;
1143                         dev_dbg(dev, "%s - data bits = 7\n", __func__);
1144                         break;
1145                 case CS8:
1146                 default:
1147                         bits |= BITS_DATA_8;
1148                         dev_dbg(dev, "%s - data bits = 8\n", __func__);
1149                         break;
1150                 }
1151                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1152                         dev_dbg(dev, "Number of data bits requested not supported by device\n");
1153         }
1154
1155         if ((cflag     & (PARENB|PARODD|CMSPAR)) !=
1156             (old_cflag & (PARENB|PARODD|CMSPAR))) {
1157                 cp210x_get_line_ctl(port, &bits);
1158                 bits &= ~BITS_PARITY_MASK;
1159                 if (cflag & PARENB) {
1160                         if (cflag & CMSPAR) {
1161                                 if (cflag & PARODD) {
1162                                         bits |= BITS_PARITY_MARK;
1163                                         dev_dbg(dev, "%s - parity = MARK\n", __func__);
1164                                 } else {
1165                                         bits |= BITS_PARITY_SPACE;
1166                                         dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1167                                 }
1168                         } else {
1169                                 if (cflag & PARODD) {
1170                                         bits |= BITS_PARITY_ODD;
1171                                         dev_dbg(dev, "%s - parity = ODD\n", __func__);
1172                                 } else {
1173                                         bits |= BITS_PARITY_EVEN;
1174                                         dev_dbg(dev, "%s - parity = EVEN\n", __func__);
1175                                 }
1176                         }
1177                 }
1178                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1179                         dev_dbg(dev, "Parity mode not supported by device\n");
1180         }
1181
1182         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
1183                 cp210x_get_line_ctl(port, &bits);
1184                 bits &= ~BITS_STOP_MASK;
1185                 if (cflag & CSTOPB) {
1186                         bits |= BITS_STOP_2;
1187                         dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1188                 } else {
1189                         bits |= BITS_STOP_1;
1190                         dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1191                 }
1192                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1193                         dev_dbg(dev, "Number of stop bits requested not supported by device\n");
1194         }
1195
1196         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
1197                 struct cp210x_flow_ctl flow_ctl;
1198                 u32 ctl_hs;
1199                 u32 flow_repl;
1200
1201                 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1202                                 sizeof(flow_ctl));
1203                 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1204                 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1205                 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1206                                 __func__, ctl_hs, flow_repl);
1207
1208                 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1209                 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1210                 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1211                 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1212                 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1213                 if (cflag & CRTSCTS) {
1214                         ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1215
1216                         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1217                         flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1218                                         CP210X_SERIAL_RTS_FLOW_CTL);
1219                         dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1220                 } else {
1221                         ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1222
1223                         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1224                         flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1225                                         CP210X_SERIAL_RTS_ACTIVE);
1226                         dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1227                 }
1228
1229                 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1230                                 __func__, ctl_hs, flow_repl);
1231                 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1232                 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1233                 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1234                                 sizeof(flow_ctl));
1235         }
1236
1237 }
1238
1239 static int cp210x_tiocmset(struct tty_struct *tty,
1240                 unsigned int set, unsigned int clear)
1241 {
1242         struct usb_serial_port *port = tty->driver_data;
1243         return cp210x_tiocmset_port(port, set, clear);
1244 }
1245
1246 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1247                 unsigned int set, unsigned int clear)
1248 {
1249         u16 control = 0;
1250
1251         if (set & TIOCM_RTS) {
1252                 control |= CONTROL_RTS;
1253                 control |= CONTROL_WRITE_RTS;
1254         }
1255         if (set & TIOCM_DTR) {
1256                 control |= CONTROL_DTR;
1257                 control |= CONTROL_WRITE_DTR;
1258         }
1259         if (clear & TIOCM_RTS) {
1260                 control &= ~CONTROL_RTS;
1261                 control |= CONTROL_WRITE_RTS;
1262         }
1263         if (clear & TIOCM_DTR) {
1264                 control &= ~CONTROL_DTR;
1265                 control |= CONTROL_WRITE_DTR;
1266         }
1267
1268         dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1269
1270         return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1271 }
1272
1273 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1274 {
1275         if (on)
1276                 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1277         else
1278                 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1279 }
1280
1281 static int cp210x_tiocmget(struct tty_struct *tty)
1282 {
1283         struct usb_serial_port *port = tty->driver_data;
1284         u8 control;
1285         int result;
1286
1287         result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1288         if (result)
1289                 return result;
1290
1291         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1292                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1293                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1294                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1295                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
1296                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
1297
1298         dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1299
1300         return result;
1301 }
1302
1303 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1304 {
1305         struct usb_serial_port *port = tty->driver_data;
1306         u16 state;
1307
1308         if (break_state == 0)
1309                 state = BREAK_OFF;
1310         else
1311                 state = BREAK_ON;
1312         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1313                 state == BREAK_OFF ? "off" : "on");
1314         cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1315 }
1316
1317 #ifdef CONFIG_GPIOLIB
1318 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset)
1319 {
1320         struct usb_serial *serial = gpiochip_get_data(gc);
1321         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1322
1323         switch (offset) {
1324         case 0:
1325                 if (priv->config & CP2105_GPIO0_TXLED_MODE)
1326                         return -ENODEV;
1327                 break;
1328         case 1:
1329                 if (priv->config & (CP2105_GPIO1_RXLED_MODE |
1330                                     CP2105_GPIO1_RS485_MODE))
1331                         return -ENODEV;
1332                 break;
1333         }
1334
1335         return 0;
1336 }
1337
1338 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1339 {
1340         struct usb_serial *serial = gpiochip_get_data(gc);
1341         int result;
1342         u8 buf;
1343
1344         result = cp210x_read_vendor_block(serial, REQTYPE_INTERFACE_TO_HOST,
1345                                           CP210X_READ_LATCH, &buf, sizeof(buf));
1346         if (result < 0)
1347                 return result;
1348
1349         return !!(buf & BIT(gpio));
1350 }
1351
1352 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1353 {
1354         struct usb_serial *serial = gpiochip_get_data(gc);
1355         struct cp210x_gpio_write buf;
1356
1357         if (value == 1)
1358                 buf.state = BIT(gpio);
1359         else
1360                 buf.state = 0;
1361
1362         buf.mask = BIT(gpio);
1363
1364         cp210x_write_vendor_block(serial, REQTYPE_HOST_TO_INTERFACE,
1365                                   CP210X_WRITE_LATCH, &buf, sizeof(buf));
1366 }
1367
1368 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1369 {
1370         /* Hardware does not support an input mode */
1371         return 0;
1372 }
1373
1374 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1375 {
1376         /* Hardware does not support an input mode */
1377         return -ENOTSUPP;
1378 }
1379
1380 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1381                                         int value)
1382 {
1383         return 0;
1384 }
1385
1386 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1387                                   unsigned long config)
1388 {
1389         struct usb_serial *serial = gpiochip_get_data(gc);
1390         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1391         enum pin_config_param param = pinconf_to_config_param(config);
1392
1393         /* Succeed only if in correct mode (this can't be set at runtime) */
1394         if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1395             (priv->gpio_mode & BIT(gpio)))
1396                 return 0;
1397
1398         if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1399             !(priv->gpio_mode & BIT(gpio)))
1400                 return 0;
1401
1402         return -ENOTSUPP;
1403 }
1404
1405 /*
1406  * This function is for configuring GPIO using shared pins, where other signals
1407  * are made unavailable by configuring the use of GPIO. This is believed to be
1408  * only applicable to the cp2105 at this point, the other devices supported by
1409  * this driver that provide GPIO do so in a way that does not impact other
1410  * signals and are thus expected to have very different initialisation.
1411  */
1412 static int cp2105_shared_gpio_init(struct usb_serial *serial)
1413 {
1414         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1415         struct cp210x_pin_mode mode;
1416         struct cp210x_config config;
1417         u8 intf_num = cp210x_interface_num(serial);
1418         int result;
1419
1420         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1421                                           CP210X_GET_DEVICEMODE, &mode,
1422                                           sizeof(mode));
1423         if (result < 0)
1424                 return result;
1425
1426         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1427                                           CP210X_GET_PORTCONFIG, &config,
1428                                           sizeof(config));
1429         if (result < 0)
1430                 return result;
1431
1432         /*  2 banks of GPIO - One for the pins taken from each serial port */
1433         if (intf_num == 0) {
1434                 if (mode.eci == CP210X_PIN_MODE_MODEM)
1435                         return 0;
1436
1437                 priv->config = config.eci_cfg;
1438                 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
1439                                                 CP210X_ECI_GPIO_MODE_MASK) >>
1440                                                 CP210X_ECI_GPIO_MODE_OFFSET);
1441                 priv->gc.ngpio = 2;
1442         } else if (intf_num == 1) {
1443                 if (mode.sci == CP210X_PIN_MODE_MODEM)
1444                         return 0;
1445
1446                 priv->config = config.sci_cfg;
1447                 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
1448                                                 CP210X_SCI_GPIO_MODE_MASK) >>
1449                                                 CP210X_SCI_GPIO_MODE_OFFSET);
1450                 priv->gc.ngpio = 3;
1451         } else {
1452                 return -ENODEV;
1453         }
1454
1455         priv->gc.label = "cp210x";
1456         priv->gc.request = cp210x_gpio_request;
1457         priv->gc.get_direction = cp210x_gpio_direction_get;
1458         priv->gc.direction_input = cp210x_gpio_direction_input;
1459         priv->gc.direction_output = cp210x_gpio_direction_output;
1460         priv->gc.get = cp210x_gpio_get;
1461         priv->gc.set = cp210x_gpio_set;
1462         priv->gc.set_config = cp210x_gpio_set_config;
1463         priv->gc.owner = THIS_MODULE;
1464         priv->gc.parent = &serial->interface->dev;
1465         priv->gc.base = -1;
1466         priv->gc.can_sleep = true;
1467
1468         result = gpiochip_add_data(&priv->gc, serial);
1469         if (!result)
1470                 priv->gpio_registered = true;
1471
1472         return result;
1473 }
1474
1475 static void cp210x_gpio_remove(struct usb_serial *serial)
1476 {
1477         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1478
1479         if (priv->gpio_registered) {
1480                 gpiochip_remove(&priv->gc);
1481                 priv->gpio_registered = false;
1482         }
1483 }
1484
1485 #else
1486
1487 static int cp2105_shared_gpio_init(struct usb_serial *serial)
1488 {
1489         return 0;
1490 }
1491
1492 static void cp210x_gpio_remove(struct usb_serial *serial)
1493 {
1494         /* Nothing to do */
1495 }
1496
1497 #endif
1498
1499 static int cp210x_port_probe(struct usb_serial_port *port)
1500 {
1501         struct usb_serial *serial = port->serial;
1502         struct cp210x_port_private *port_priv;
1503         int ret;
1504
1505         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1506         if (!port_priv)
1507                 return -ENOMEM;
1508
1509         port_priv->bInterfaceNumber = cp210x_interface_num(serial);
1510
1511         usb_set_serial_port_data(port, port_priv);
1512
1513         ret = cp210x_detect_swapped_line_ctl(port);
1514         if (ret) {
1515                 kfree(port_priv);
1516                 return ret;
1517         }
1518
1519         return 0;
1520 }
1521
1522 static int cp210x_port_remove(struct usb_serial_port *port)
1523 {
1524         struct cp210x_port_private *port_priv;
1525
1526         port_priv = usb_get_serial_port_data(port);
1527         kfree(port_priv);
1528
1529         return 0;
1530 }
1531
1532 static int cp210x_attach(struct usb_serial *serial)
1533 {
1534         int result;
1535         struct cp210x_serial_private *priv;
1536
1537         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1538         if (!priv)
1539                 return -ENOMEM;
1540
1541         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1542                                           CP210X_GET_PARTNUM, &priv->partnum,
1543                                           sizeof(priv->partnum));
1544         if (result < 0) {
1545                 dev_warn(&serial->interface->dev,
1546                          "querying part number failed\n");
1547                 priv->partnum = CP210X_PARTNUM_UNKNOWN;
1548         }
1549
1550         usb_set_serial_data(serial, priv);
1551
1552         if (priv->partnum == CP210X_PARTNUM_CP2105) {
1553                 result = cp2105_shared_gpio_init(serial);
1554                 if (result < 0) {
1555                         dev_err(&serial->interface->dev,
1556                                 "GPIO initialisation failed, continuing without GPIO support\n");
1557                 }
1558         }
1559
1560         return 0;
1561 }
1562
1563 static void cp210x_disconnect(struct usb_serial *serial)
1564 {
1565         cp210x_gpio_remove(serial);
1566 }
1567
1568 static void cp210x_release(struct usb_serial *serial)
1569 {
1570         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1571
1572         cp210x_gpio_remove(serial);
1573
1574         kfree(priv);
1575 }
1576
1577 module_usb_serial_driver(serial_drivers, id_table);
1578
1579 MODULE_DESCRIPTION(DRIVER_DESC);
1580 MODULE_LICENSE("GPL");