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