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, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
 145         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 146         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 147         { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
 148         { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
 149         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 150         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 151         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 152         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 153         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 154         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 155         { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
 156         { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
 157         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 158         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 159         { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
 160         { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
 161         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 162         { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
 163         { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
 164         { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
 165         { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
 166         { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
 167         { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
 168         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 169         { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
 170         { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
 171         { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
 172         { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
 173         { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
 174         { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
 175         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
 176         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
 177         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 178         { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
 179         { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
 180         { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
 181         { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
 182         { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
 183         { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
 184         { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
 185         { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
 186         { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
 187         { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
 188         { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
 189         { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
 190         { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
 191         { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
 192         { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
 193         { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
 194         { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
 195         { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
 196         { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
 197         { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
 198         { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
 199         { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
 200         { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
 201         { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
 202         { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
 203         { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
 204         { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
 205         { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
 206         { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
 207         { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
 208         { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
 209         { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
 210         { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
 211         { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
 212         { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
 213         { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
 214         { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
 215         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 216         { } /* Terminating Entry */
 217 };
 218
 219 MODULE_DEVICE_TABLE(usb, id_table);
 220
 221 struct cp210x_serial_private {
 222 #ifdef CONFIG_GPIOLIB
 223         struct gpio_chip        gc;
 224         u8                      config;
 225         u8                      gpio_mode;
 226         bool                    gpio_registered;
 227 #endif
 228         u8                      partnum;
 229 };
 230
 231 struct cp210x_port_private {
 232         __u8                    bInterfaceNumber;
 233         bool                    has_swapped_line_ctl;
 234 };
 235
 236 static struct usb_serial_driver cp210x_device = {
 237         .driver = {
 238                 .owner =        THIS_MODULE,
 239                 .name =         "cp210x",
 240         },
 241         .id_table               = id_table,
 242         .num_ports              = 1,
 243         .bulk_in_size           = 256,
 244         .bulk_out_size          = 256,
 245         .open                   = cp210x_open,
 246         .close                  = cp210x_close,
 247         .break_ctl              = cp210x_break_ctl,
 248         .set_termios            = cp210x_set_termios,
 249         .tx_empty               = cp210x_tx_empty,
 250         .tiocmget               = cp210x_tiocmget,
 251         .tiocmset               = cp210x_tiocmset,
 252         .attach                 = cp210x_attach,
 253         .disconnect             = cp210x_disconnect,
 254         .release                = cp210x_release,
 255         .port_probe             = cp210x_port_probe,
 256         .port_remove            = cp210x_port_remove,
 257         .dtr_rts                = cp210x_dtr_rts
 258 };
 259
 260 static struct usb_serial_driver * const serial_drivers[] = {
 261         &cp210x_device, NULL
 262 };
 263
 264 /* Config request types */
 265 #define REQTYPE_HOST_TO_INTERFACE       0x41
 266 #define REQTYPE_INTERFACE_TO_HOST       0xc1
 267 #define REQTYPE_HOST_TO_DEVICE  0x40
 268 #define REQTYPE_DEVICE_TO_HOST  0xc0
 269
 270 /* Config request codes */
 271 #define CP210X_IFC_ENABLE       0x00
 272 #define CP210X_SET_BAUDDIV      0x01
 273 #define CP210X_GET_BAUDDIV      0x02
 274 #define CP210X_SET_LINE_CTL     0x03
 275 #define CP210X_GET_LINE_CTL     0x04
 276 #define CP210X_SET_BREAK        0x05
 277 #define CP210X_IMM_CHAR         0x06
 278 #define CP210X_SET_MHS          0x07
 279 #define CP210X_GET_MDMSTS       0x08
 280 #define CP210X_SET_XON          0x09
 281 #define CP210X_SET_XOFF         0x0A
 282 #define CP210X_SET_EVENTMASK    0x0B
 283 #define CP210X_GET_EVENTMASK    0x0C
 284 #define CP210X_SET_CHAR         0x0D
 285 #define CP210X_GET_CHARS        0x0E
 286 #define CP210X_GET_PROPS        0x0F
 287 #define CP210X_GET_COMM_STATUS  0x10
 288 #define CP210X_RESET            0x11
 289 #define CP210X_PURGE            0x12
 290 #define CP210X_SET_FLOW         0x13
 291 #define CP210X_GET_FLOW         0x14
 292 #define CP210X_EMBED_EVENTS     0x15
 293 #define CP210X_GET_EVENTSTATE   0x16
 294 #define CP210X_SET_CHARS        0x19
 295 #define CP210X_GET_BAUDRATE     0x1D
 296 #define CP210X_SET_BAUDRATE     0x1E
 297 #define CP210X_VENDOR_SPECIFIC  0xFF
 298
 299 /* CP210X_IFC_ENABLE */
 300 #define UART_ENABLE             0x0001
 301 #define UART_DISABLE            0x0000
 302
 303 /* CP210X_(SET|GET)_BAUDDIV */
 304 #define BAUD_RATE_GEN_FREQ      0x384000
 305
 306 /* CP210X_(SET|GET)_LINE_CTL */
 307 #define BITS_DATA_MASK          0X0f00
 308 #define BITS_DATA_5             0X0500
 309 #define BITS_DATA_6             0X0600
 310 #define BITS_DATA_7             0X0700
 311 #define BITS_DATA_8             0X0800
 312 #define BITS_DATA_9             0X0900
 313
 314 #define BITS_PARITY_MASK        0x00f0
 315 #define BITS_PARITY_NONE        0x0000
 316 #define BITS_PARITY_ODD         0x0010
 317 #define BITS_PARITY_EVEN        0x0020
 318 #define BITS_PARITY_MARK        0x0030
 319 #define BITS_PARITY_SPACE       0x0040
 320
 321 #define BITS_STOP_MASK          0x000f
 322 #define BITS_STOP_1             0x0000
 323 #define BITS_STOP_1_5           0x0001
 324 #define BITS_STOP_2             0x0002
 325
 326 /* CP210X_SET_BREAK */
 327 #define BREAK_ON                0x0001
 328 #define BREAK_OFF               0x0000
 329
 330 /* CP210X_(SET_MHS|GET_MDMSTS) */
 331 #define CONTROL_DTR             0x0001
 332 #define CONTROL_RTS             0x0002
 333 #define CONTROL_CTS             0x0010
 334 #define CONTROL_DSR             0x0020
 335 #define CONTROL_RING            0x0040
 336 #define CONTROL_DCD             0x0080
 337 #define CONTROL_WRITE_DTR       0x0100
 338 #define CONTROL_WRITE_RTS       0x0200
 339
 340 /* CP210X_VENDOR_SPECIFIC values */
 341 #define CP210X_READ_LATCH       0x00C2
 342 #define CP210X_GET_PARTNUM      0x370B
 343 #define CP210X_GET_PORTCONFIG   0x370C
 344 #define CP210X_GET_DEVICEMODE   0x3711
 345 #define CP210X_WRITE_LATCH      0x37E1
 346
 347 /* Part number definitions */
 348 #define CP210X_PARTNUM_CP2101   0x01
 349 #define CP210X_PARTNUM_CP2102   0x02
 350 #define CP210X_PARTNUM_CP2103   0x03
 351 #define CP210X_PARTNUM_CP2104   0x04
 352 #define CP210X_PARTNUM_CP2105   0x05
 353 #define CP210X_PARTNUM_CP2108   0x08
 354
 355 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
 356 struct cp210x_comm_status {
 357         __le32   ulErrors;
 358         __le32   ulHoldReasons;
 359         __le32   ulAmountInInQueue;
 360         __le32   ulAmountInOutQueue;
 361         u8       bEofReceived;
 362         u8       bWaitForImmediate;
 363         u8       bReserved;
 364 } __packed;
 365
 366 /*
 367  * CP210X_PURGE - 16 bits passed in wValue of USB request.
 368  * SiLabs app note AN571 gives a strange description of the 4 bits:
 369  * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
 370  * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
 371  */
 372 #define PURGE_ALL               0x000f
 373
 374 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
 375 struct cp210x_flow_ctl {
 376         __le32  ulControlHandshake;
 377         __le32  ulFlowReplace;
 378         __le32  ulXonLimit;
 379         __le32  ulXoffLimit;
 380 } __packed;
 381
 382 /* cp210x_flow_ctl::ulControlHandshake */
 383 #define CP210X_SERIAL_DTR_MASK          GENMASK(1, 0)
 384 #define CP210X_SERIAL_DTR_SHIFT(_mode)  (_mode)
 385 #define CP210X_SERIAL_CTS_HANDSHAKE     BIT(3)
 386 #define CP210X_SERIAL_DSR_HANDSHAKE     BIT(4)
 387 #define CP210X_SERIAL_DCD_HANDSHAKE     BIT(5)
 388 #define CP210X_SERIAL_DSR_SENSITIVITY   BIT(6)
 389
 390 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
 391 #define CP210X_SERIAL_DTR_INACTIVE      0
 392 #define CP210X_SERIAL_DTR_ACTIVE        1
 393 #define CP210X_SERIAL_DTR_FLOW_CTL      2
 394
 395 /* cp210x_flow_ctl::ulFlowReplace */
 396 #define CP210X_SERIAL_AUTO_TRANSMIT     BIT(0)
 397 #define CP210X_SERIAL_AUTO_RECEIVE      BIT(1)
 398 #define CP210X_SERIAL_ERROR_CHAR        BIT(2)
 399 #define CP210X_SERIAL_NULL_STRIPPING    BIT(3)
 400 #define CP210X_SERIAL_BREAK_CHAR        BIT(4)
 401 #define CP210X_SERIAL_RTS_MASK          GENMASK(7, 6)
 402 #define CP210X_SERIAL_RTS_SHIFT(_mode)  (_mode << 6)
 403 #define CP210X_SERIAL_XOFF_CONTINUE     BIT(31)
 404
 405 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
 406 #define CP210X_SERIAL_RTS_INACTIVE      0
 407 #define CP210X_SERIAL_RTS_ACTIVE        1
 408 #define CP210X_SERIAL_RTS_FLOW_CTL      2
 409
 410 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
 411 struct cp210x_pin_mode {
 412         u8      eci;
 413         u8      sci;
 414 } __packed;
 415
 416 #define CP210X_PIN_MODE_MODEM           0
 417 #define CP210X_PIN_MODE_GPIO            BIT(0)
 418
 419 /*
 420  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes.
 421  * Structure needs padding due to unused/unspecified bytes.
 422  */
 423 struct cp210x_config {
 424         __le16  gpio_mode;
 425         u8      __pad0[2];
 426         __le16  reset_state;
 427         u8      __pad1[4];
 428         __le16  suspend_state;
 429         u8      sci_cfg;
 430         u8      eci_cfg;
 431         u8      device_cfg;
 432 } __packed;
 433
 434 /* GPIO modes */
 435 #define CP210X_SCI_GPIO_MODE_OFFSET     9
 436 #define CP210X_SCI_GPIO_MODE_MASK       GENMASK(11, 9)
 437
 438 #define CP210X_ECI_GPIO_MODE_OFFSET     2
 439 #define CP210X_ECI_GPIO_MODE_MASK       GENMASK(3, 2)
 440
 441 /* CP2105 port configuration values */
 442 #define CP2105_GPIO0_TXLED_MODE         BIT(0)
 443 #define CP2105_GPIO1_RXLED_MODE         BIT(1)
 444 #define CP2105_GPIO1_RS485_MODE         BIT(2)
 445
 446 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
 447 struct cp210x_gpio_write {
 448         u8      mask;
 449         u8      state;
 450 } __packed;
 451
 452 /*
 453  * Helper to get interface number when we only have struct usb_serial.
 454  */
 455 static u8 cp210x_interface_num(struct usb_serial *serial)
 456 {
 457         struct usb_host_interface *cur_altsetting;
 458
 459         cur_altsetting = serial->interface->cur_altsetting;
 460
 461         return cur_altsetting->desc.bInterfaceNumber;
 462 }
 463
 464 /*
 465  * Reads a variable-sized block of CP210X_ registers, identified by req.
 466  * Returns data into buf in native USB byte order.
 467  */
 468 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
 469                 void *buf, int bufsize)
 470 {
 471         struct usb_serial *serial = port->serial;
 472         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 473         void *dmabuf;
 474         int result;
 475
 476         dmabuf = kmalloc(bufsize, GFP_KERNEL);
 477         if (!dmabuf) {
 478                 /*
 479                  * FIXME Some callers don't bother to check for error,
 480                  * at least give them consistent junk until they are fixed
 481                  */
 482                 memset(buf, 0, bufsize);
 483                 return -ENOMEM;
 484         }
 485
 486         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 487                         req, REQTYPE_INTERFACE_TO_HOST, 0,
 488                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 489                         USB_CTRL_SET_TIMEOUT);
 490         if (result == bufsize) {
 491                 memcpy(buf, dmabuf, bufsize);
 492                 result = 0;
 493         } else {
 494                 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
 495                                 req, bufsize, result);
 496                 if (result >= 0)
 497                         result = -EIO;
 498
 499                 /*
 500                  * FIXME Some callers don't bother to check for error,
 501                  * at least give them consistent junk until they are fixed
 502                  */
 503                 memset(buf, 0, bufsize);
 504         }
 505
 506         kfree(dmabuf);
 507
 508         return result;
 509 }
 510
 511 /*
 512  * Reads any 32-bit CP210X_ register identified by req.
 513  */
 514 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
 515 {
 516         __le32 le32_val;
 517         int err;
 518
 519         err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
 520         if (err) {
 521                 /*
 522                  * FIXME Some callers don't bother to check for error,
 523                  * at least give them consistent junk until they are fixed
 524                  */
 525                 *val = 0;
 526                 return err;
 527         }
 528
 529         *val = le32_to_cpu(le32_val);
 530
 531         return 0;
 532 }
 533
 534 /*
 535  * Reads any 16-bit CP210X_ register identified by req.
 536  */
 537 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
 538 {
 539         __le16 le16_val;
 540         int err;
 541
 542         err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
 543         if (err)
 544                 return err;
 545
 546         *val = le16_to_cpu(le16_val);
 547
 548         return 0;
 549 }
 550
 551 /*
 552  * Reads any 8-bit CP210X_ register identified by req.
 553  */
 554 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
 555 {
 556         return cp210x_read_reg_block(port, req, val, sizeof(*val));
 557 }
 558
 559 /*
 560  * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
 561  * Returns data into buf in native USB byte order.
 562  */
 563 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
 564                                     void *buf, int bufsize)
 565 {
 566         void *dmabuf;
 567         int result;
 568
 569         dmabuf = kmalloc(bufsize, GFP_KERNEL);
 570         if (!dmabuf)
 571                 return -ENOMEM;
 572
 573         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 574                                  CP210X_VENDOR_SPECIFIC, type, val,
 575                                  cp210x_interface_num(serial), dmabuf, bufsize,
 576                                  USB_CTRL_GET_TIMEOUT);
 577         if (result == bufsize) {
 578                 memcpy(buf, dmabuf, bufsize);
 579                 result = 0;
 580         } else {
 581                 dev_err(&serial->interface->dev,
 582                         "failed to get vendor val 0x%04x size %d: %d\n", val,
 583                         bufsize, result);
 584                 if (result >= 0)
 585                         result = -EIO;
 586         }
 587
 588         kfree(dmabuf);
 589
 590         return result;
 591 }
 592
 593 /*
 594  * Writes any 16-bit CP210X_ register (req) whose value is passed
 595  * entirely in the wValue field of the USB request.
 596  */
 597 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
 598 {
 599         struct usb_serial *serial = port->serial;
 600         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 601         int result;
 602
 603         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 604                         req, REQTYPE_HOST_TO_INTERFACE, val,
 605                         port_priv->bInterfaceNumber, NULL, 0,
 606                         USB_CTRL_SET_TIMEOUT);
 607         if (result < 0) {
 608                 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
 609                                 req, result);
 610         }
 611
 612         return result;
 613 }
 614
 615 /*
 616  * Writes a variable-sized block of CP210X_ registers, identified by req.
 617  * Data in buf must be in native USB byte order.
 618  */
 619 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
 620                 void *buf, int bufsize)
 621 {
 622         struct usb_serial *serial = port->serial;
 623         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 624         void *dmabuf;
 625         int result;
 626
 627         dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
 628         if (!dmabuf)
 629                 return -ENOMEM;
 630
 631         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 632                         req, REQTYPE_HOST_TO_INTERFACE, 0,
 633                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 634                         USB_CTRL_SET_TIMEOUT);
 635
 636         kfree(dmabuf);
 637
 638         if (result == bufsize) {
 639                 result = 0;
 640         } else {
 641                 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
 642                                 req, bufsize, result);
 643                 if (result >= 0)
 644                         result = -EIO;
 645         }
 646
 647         return result;
 648 }
 649
 650 /*
 651  * Writes any 32-bit CP210X_ register identified by req.
 652  */
 653 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
 654 {
 655         __le32 le32_val;
 656
 657         le32_val = cpu_to_le32(val);
 658
 659         return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
 660 }
 661
 662 #ifdef CONFIG_GPIOLIB
 663 /*
 664  * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
 665  * Data in buf must be in native USB byte order.
 666  */
 667 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
 668                                      u16 val, void *buf, int bufsize)
 669 {
 670         void *dmabuf;
 671         int result;
 672
 673         dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
 674         if (!dmabuf)
 675                 return -ENOMEM;
 676
 677         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 678                                  CP210X_VENDOR_SPECIFIC, type, val,
 679                                  cp210x_interface_num(serial), dmabuf, bufsize,
 680                                  USB_CTRL_SET_TIMEOUT);
 681
 682         kfree(dmabuf);
 683
 684         if (result == bufsize) {
 685                 result = 0;
 686         } else {
 687                 dev_err(&serial->interface->dev,
 688                         "failed to set vendor val 0x%04x size %d: %d\n", val,
 689                         bufsize, result);
 690                 if (result >= 0)
 691                         result = -EIO;
 692         }
 693
 694         return result;
 695 }
 696 #endif
 697
 698 /*
 699  * Detect CP2108 GET_LINE_CTL bug and activate workaround.
 700  * Write a known good value 0x800, read it back.
 701  * If it comes back swapped the bug is detected.
 702  * Preserve the original register value.
 703  */
 704 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
 705 {
 706         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 707         u16 line_ctl_save;
 708         u16 line_ctl_test;
 709         int err;
 710
 711         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
 712         if (err)
 713                 return err;
 714
 715         err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
 716         if (err)
 717                 return err;
 718
 719         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
 720         if (err)
 721                 return err;
 722
 723         if (line_ctl_test == 8) {
 724                 port_priv->has_swapped_line_ctl = true;
 725                 line_ctl_save = swab16(line_ctl_save);
 726         }
 727
 728         return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
 729 }
 730
 731 /*
 732  * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
 733  * to workaround cp2108 bug and get correct value.
 734  */
 735 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
 736 {
 737         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 738         int err;
 739
 740         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
 741         if (err)
 742                 return err;
 743
 744         /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
 745         if (port_priv->has_swapped_line_ctl)
 746                 *ctl = swab16(*ctl);
 747
 748         return 0;
 749 }
 750
 751 /*
 752  * cp210x_quantise_baudrate
 753  * Quantises the baud rate as per AN205 Table 1
 754  */
 755 static unsigned int cp210x_quantise_baudrate(unsigned int baud)
 756 {
 757         if (baud <= 300)
 758                 baud = 300;
 759         else if (baud <= 600)      baud = 600;
 760         else if (baud <= 1200)     baud = 1200;
 761         else if (baud <= 1800)     baud = 1800;
 762         else if (baud <= 2400)     baud = 2400;
 763         else if (baud <= 4000)     baud = 4000;
 764         else if (baud <= 4803)     baud = 4800;
 765         else if (baud <= 7207)     baud = 7200;
 766         else if (baud <= 9612)     baud = 9600;
 767         else if (baud <= 14428)    baud = 14400;
 768         else if (baud <= 16062)    baud = 16000;
 769         else if (baud <= 19250)    baud = 19200;
 770         else if (baud <= 28912)    baud = 28800;
 771         else if (baud <= 38601)    baud = 38400;
 772         else if (baud <= 51558)    baud = 51200;
 773         else if (baud <= 56280)    baud = 56000;
 774         else if (baud <= 58053)    baud = 57600;
 775         else if (baud <= 64111)    baud = 64000;
 776         else if (baud <= 77608)    baud = 76800;
 777         else if (baud <= 117028)   baud = 115200;
 778         else if (baud <= 129347)   baud = 128000;
 779         else if (baud <= 156868)   baud = 153600;
 780         else if (baud <= 237832)   baud = 230400;
 781         else if (baud <= 254234)   baud = 250000;
 782         else if (baud <= 273066)   baud = 256000;
 783         else if (baud <= 491520)   baud = 460800;
 784         else if (baud <= 567138)   baud = 500000;
 785         else if (baud <= 670254)   baud = 576000;
 786         else if (baud < 1000000)
 787                 baud = 921600;
 788         else if (baud > 2000000)
 789                 baud = 2000000;
 790         return baud;
 791 }
 792
 793 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 794 {
 795         int result;
 796
 797         result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
 798         if (result) {
 799                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
 800                 return result;
 801         }
 802
 803         /* Configure the termios structure */
 804         cp210x_get_termios(tty, port);
 805
 806         /* The baud rate must be initialised on cp2104 */
 807         if (tty)
 808                 cp210x_change_speed(tty, port, NULL);
 809
 810         return usb_serial_generic_open(tty, port);
 811 }
 812
 813 static void cp210x_close(struct usb_serial_port *port)
 814 {
 815         usb_serial_generic_close(port);
 816
 817         /* Clear both queues; cp2108 needs this to avoid an occasional hang */
 818         cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
 819
 820         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 821 }
 822
 823 /*
 824  * Read how many bytes are waiting in the TX queue.
 825  */
 826 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
 827                 u32 *count)
 828 {
 829         struct usb_serial *serial = port->serial;
 830         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 831         struct cp210x_comm_status *sts;
 832         int result;
 833
 834         sts = kmalloc(sizeof(*sts), GFP_KERNEL);
 835         if (!sts)
 836                 return -ENOMEM;
 837
 838         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 839                         CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
 840                         0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
 841                         USB_CTRL_GET_TIMEOUT);
 842         if (result == sizeof(*sts)) {
 843                 *count = le32_to_cpu(sts->ulAmountInOutQueue);
 844                 result = 0;
 845         } else {
 846                 dev_err(&port->dev, "failed to get comm status: %d\n", result);
 847                 if (result >= 0)
 848                         result = -EIO;
 849         }
 850
 851         kfree(sts);
 852
 853         return result;
 854 }
 855
 856 static bool cp210x_tx_empty(struct usb_serial_port *port)
 857 {
 858         int err;
 859         u32 count;
 860
 861         err = cp210x_get_tx_queue_byte_count(port, &count);
 862         if (err)
 863                 return true;
 864
 865         return !count;
 866 }
 867
 868 /*
 869  * cp210x_get_termios
 870  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 871  * from the device, corrects any unsupported values, and configures the
 872  * termios structure to reflect the state of the device
 873  */
 874 static void cp210x_get_termios(struct tty_struct *tty,
 875         struct usb_serial_port *port)
 876 {
 877         unsigned int baud;
 878
 879         if (tty) {
 880                 cp210x_get_termios_port(tty->driver_data,
 881                         &tty->termios.c_cflag, &baud);
 882                 tty_encode_baud_rate(tty, baud, baud);
 883         } else {
 884                 tcflag_t cflag;
 885                 cflag = 0;
 886                 cp210x_get_termios_port(port, &cflag, &baud);
 887         }
 888 }
 889
 890 /*
 891  * cp210x_get_termios_port
 892  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
 893  */
 894 static void cp210x_get_termios_port(struct usb_serial_port *port,
 895         tcflag_t *cflagp, unsigned int *baudp)
 896 {
 897         struct device *dev = &port->dev;
 898         tcflag_t cflag;
 899         struct cp210x_flow_ctl flow_ctl;
 900         u32 baud;
 901         u16 bits;
 902         u32 ctl_hs;
 903
 904         cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
 905
 906         dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
 907         *baudp = baud;
 908
 909         cflag = *cflagp;
 910
 911         cp210x_get_line_ctl(port, &bits);
 912         cflag &= ~CSIZE;
 913         switch (bits & BITS_DATA_MASK) {
 914         case BITS_DATA_5:
 915                 dev_dbg(dev, "%s - data bits = 5\n", __func__);
 916                 cflag |= CS5;
 917                 break;
 918         case BITS_DATA_6:
 919                 dev_dbg(dev, "%s - data bits = 6\n", __func__);
 920                 cflag |= CS6;
 921                 break;
 922         case BITS_DATA_7:
 923                 dev_dbg(dev, "%s - data bits = 7\n", __func__);
 924                 cflag |= CS7;
 925                 break;
 926         case BITS_DATA_8:
 927                 dev_dbg(dev, "%s - data bits = 8\n", __func__);
 928                 cflag |= CS8;
 929                 break;
 930         case BITS_DATA_9:
 931                 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
 932                 cflag |= CS8;
 933                 bits &= ~BITS_DATA_MASK;
 934                 bits |= BITS_DATA_8;
 935                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 936                 break;
 937         default:
 938                 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
 939                 cflag |= CS8;
 940                 bits &= ~BITS_DATA_MASK;
 941                 bits |= BITS_DATA_8;
 942                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 943                 break;
 944         }
 945
 946         switch (bits & BITS_PARITY_MASK) {
 947         case BITS_PARITY_NONE:
 948                 dev_dbg(dev, "%s - parity = NONE\n", __func__);
 949                 cflag &= ~PARENB;
 950                 break;
 951         case BITS_PARITY_ODD:
 952                 dev_dbg(dev, "%s - parity = ODD\n", __func__);
 953                 cflag |= (PARENB|PARODD);
 954                 break;
 955         case BITS_PARITY_EVEN:
 956                 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
 957                 cflag &= ~PARODD;
 958                 cflag |= PARENB;
 959                 break;
 960         case BITS_PARITY_MARK:
 961                 dev_dbg(dev, "%s - parity = MARK\n", __func__);
 962                 cflag |= (PARENB|PARODD|CMSPAR);
 963                 break;
 964         case BITS_PARITY_SPACE:
 965                 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
 966                 cflag &= ~PARODD;
 967                 cflag |= (PARENB|CMSPAR);
 968                 break;
 969         default:
 970                 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
 971                 cflag &= ~PARENB;
 972                 bits &= ~BITS_PARITY_MASK;
 973                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 974                 break;
 975         }
 976
 977         cflag &= ~CSTOPB;
 978         switch (bits & BITS_STOP_MASK) {
 979         case BITS_STOP_1:
 980                 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
 981                 break;
 982         case BITS_STOP_1_5:
 983                 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
 984                 bits &= ~BITS_STOP_MASK;
 985                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 986                 break;
 987         case BITS_STOP_2:
 988                 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
 989                 cflag |= CSTOPB;
 990                 break;
 991         default:
 992                 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
 993                 bits &= ~BITS_STOP_MASK;
 994                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 995                 break;
 996         }
 997
 998         cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
 999                         sizeof(flow_ctl));
1000         ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1001         if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
1002                 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1003                 cflag |= CRTSCTS;
1004         } else {
1005                 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1006                 cflag &= ~CRTSCTS;
1007         }
1008
1009         *cflagp = cflag;
1010 }
1011
1012 /*
1013  * CP2101 supports the following baud rates:
1014  *
1015  *      300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1016  *      38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1017  *
1018  * CP2102 and CP2103 support the following additional rates:
1019  *
1020  *      4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1021  *      576000
1022  *
1023  * The device will map a requested rate to a supported one, but the result
1024  * of requests for rates greater than 1053257 is undefined (see AN205).
1025  *
1026  * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1027  * respectively, with an error less than 1%. The actual rates are determined
1028  * by
1029  *
1030  *      div = round(freq / (2 x prescale x request))
1031  *      actual = freq / (2 x prescale x div)
1032  *
1033  * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1034  * or 1 otherwise.
1035  * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1036  * otherwise.
1037  */
1038 static void cp210x_change_speed(struct tty_struct *tty,
1039                 struct usb_serial_port *port, struct ktermios *old_termios)
1040 {
1041         u32 baud;
1042
1043         baud = tty->termios.c_ospeed;
1044
1045         /* This maps the requested rate to a rate valid on cp2102 or cp2103,
1046          * or to an arbitrary rate in [1M,2M].
1047          *
1048          * NOTE: B0 is not implemented.
1049          */
1050         baud = cp210x_quantise_baudrate(baud);
1051
1052         dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1053         if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1054                 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1055                 if (old_termios)
1056                         baud = old_termios->c_ospeed;
1057                 else
1058                         baud = 9600;
1059         }
1060
1061         tty_encode_baud_rate(tty, baud, baud);
1062 }
1063
1064 static void cp210x_set_termios(struct tty_struct *tty,
1065                 struct usb_serial_port *port, struct ktermios *old_termios)
1066 {
1067         struct device *dev = &port->dev;
1068         unsigned int cflag, old_cflag;
1069         u16 bits;
1070
1071         cflag = tty->termios.c_cflag;
1072         old_cflag = old_termios->c_cflag;
1073
1074         if (tty->termios.c_ospeed != old_termios->c_ospeed)
1075                 cp210x_change_speed(tty, port, old_termios);
1076
1077         /* If the number of data bits is to be updated */
1078         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
1079                 cp210x_get_line_ctl(port, &bits);
1080                 bits &= ~BITS_DATA_MASK;
1081                 switch (cflag & CSIZE) {
1082                 case CS5:
1083                         bits |= BITS_DATA_5;
1084                         dev_dbg(dev, "%s - data bits = 5\n", __func__);
1085                         break;
1086                 case CS6:
1087                         bits |= BITS_DATA_6;
1088                         dev_dbg(dev, "%s - data bits = 6\n", __func__);
1089                         break;
1090                 case CS7:
1091                         bits |= BITS_DATA_7;
1092                         dev_dbg(dev, "%s - data bits = 7\n", __func__);
1093                         break;
1094                 case CS8:
1095                 default:
1096                         bits |= BITS_DATA_8;
1097                         dev_dbg(dev, "%s - data bits = 8\n", __func__);
1098                         break;
1099                 }
1100                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1101                         dev_dbg(dev, "Number of data bits requested not supported by device\n");
1102         }
1103
1104         if ((cflag     & (PARENB|PARODD|CMSPAR)) !=
1105             (old_cflag & (PARENB|PARODD|CMSPAR))) {
1106                 cp210x_get_line_ctl(port, &bits);
1107                 bits &= ~BITS_PARITY_MASK;
1108                 if (cflag & PARENB) {
1109                         if (cflag & CMSPAR) {
1110                                 if (cflag & PARODD) {
1111                                         bits |= BITS_PARITY_MARK;
1112                                         dev_dbg(dev, "%s - parity = MARK\n", __func__);
1113                                 } else {
1114                                         bits |= BITS_PARITY_SPACE;
1115                                         dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1116                                 }
1117                         } else {
1118                                 if (cflag & PARODD) {
1119                                         bits |= BITS_PARITY_ODD;
1120                                         dev_dbg(dev, "%s - parity = ODD\n", __func__);
1121                                 } else {
1122                                         bits |= BITS_PARITY_EVEN;
1123                                         dev_dbg(dev, "%s - parity = EVEN\n", __func__);
1124                                 }
1125                         }
1126                 }
1127                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1128                         dev_dbg(dev, "Parity mode not supported by device\n");
1129         }
1130
1131         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
1132                 cp210x_get_line_ctl(port, &bits);
1133                 bits &= ~BITS_STOP_MASK;
1134                 if (cflag & CSTOPB) {
1135                         bits |= BITS_STOP_2;
1136                         dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1137                 } else {
1138                         bits |= BITS_STOP_1;
1139                         dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1140                 }
1141                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1142                         dev_dbg(dev, "Number of stop bits requested not supported by device\n");
1143         }
1144
1145         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
1146                 struct cp210x_flow_ctl flow_ctl;
1147                 u32 ctl_hs;
1148                 u32 flow_repl;
1149
1150                 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1151                                 sizeof(flow_ctl));
1152                 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1153                 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1154                 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1155                                 __func__, ctl_hs, flow_repl);
1156
1157                 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1158                 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1159                 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1160                 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1161                 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1162                 if (cflag & CRTSCTS) {
1163                         ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1164
1165                         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1166                         flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1167                                         CP210X_SERIAL_RTS_FLOW_CTL);
1168                         dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1169                 } else {
1170                         ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1171
1172                         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1173                         flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1174                                         CP210X_SERIAL_RTS_ACTIVE);
1175                         dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1176                 }
1177
1178                 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1179                                 __func__, ctl_hs, flow_repl);
1180                 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1181                 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1182                 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1183                                 sizeof(flow_ctl));
1184         }
1185
1186 }
1187
1188 static int cp210x_tiocmset(struct tty_struct *tty,
1189                 unsigned int set, unsigned int clear)
1190 {
1191         struct usb_serial_port *port = tty->driver_data;
1192         return cp210x_tiocmset_port(port, set, clear);
1193 }
1194
1195 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1196                 unsigned int set, unsigned int clear)
1197 {
1198         u16 control = 0;
1199
1200         if (set & TIOCM_RTS) {
1201                 control |= CONTROL_RTS;
1202                 control |= CONTROL_WRITE_RTS;
1203         }
1204         if (set & TIOCM_DTR) {
1205                 control |= CONTROL_DTR;
1206                 control |= CONTROL_WRITE_DTR;
1207         }
1208         if (clear & TIOCM_RTS) {
1209                 control &= ~CONTROL_RTS;
1210                 control |= CONTROL_WRITE_RTS;
1211         }
1212         if (clear & TIOCM_DTR) {
1213                 control &= ~CONTROL_DTR;
1214                 control |= CONTROL_WRITE_DTR;
1215         }
1216
1217         dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1218
1219         return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1220 }
1221
1222 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1223 {
1224         if (on)
1225                 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1226         else
1227                 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1228 }
1229
1230 static int cp210x_tiocmget(struct tty_struct *tty)
1231 {
1232         struct usb_serial_port *port = tty->driver_data;
1233         u8 control;
1234         int result;
1235
1236         result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1237         if (result)
1238                 return result;
1239
1240         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1241                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1242                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1243                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1244                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
1245                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
1246
1247         dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1248
1249         return result;
1250 }
1251
1252 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1253 {
1254         struct usb_serial_port *port = tty->driver_data;
1255         u16 state;
1256
1257         if (break_state == 0)
1258                 state = BREAK_OFF;
1259         else
1260                 state = BREAK_ON;
1261         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1262                 state == BREAK_OFF ? "off" : "on");
1263         cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1264 }
1265
1266 #ifdef CONFIG_GPIOLIB
1267 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset)
1268 {
1269         struct usb_serial *serial = gpiochip_get_data(gc);
1270         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1271
1272         switch (offset) {
1273         case 0:
1274                 if (priv->config & CP2105_GPIO0_TXLED_MODE)
1275                         return -ENODEV;
1276                 break;
1277         case 1:
1278                 if (priv->config & (CP2105_GPIO1_RXLED_MODE |
1279                                     CP2105_GPIO1_RS485_MODE))
1280                         return -ENODEV;
1281                 break;
1282         }
1283
1284         return 0;
1285 }
1286
1287 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1288 {
1289         struct usb_serial *serial = gpiochip_get_data(gc);
1290         int result;
1291         u8 buf;
1292
1293         result = cp210x_read_vendor_block(serial, REQTYPE_INTERFACE_TO_HOST,
1294                                           CP210X_READ_LATCH, &buf, sizeof(buf));
1295         if (result < 0)
1296                 return result;
1297
1298         return !!(buf & BIT(gpio));
1299 }
1300
1301 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1302 {
1303         struct usb_serial *serial = gpiochip_get_data(gc);
1304         struct cp210x_gpio_write buf;
1305
1306         if (value == 1)
1307                 buf.state = BIT(gpio);
1308         else
1309                 buf.state = 0;
1310
1311         buf.mask = BIT(gpio);
1312
1313         cp210x_write_vendor_block(serial, REQTYPE_HOST_TO_INTERFACE,
1314                                   CP210X_WRITE_LATCH, &buf, sizeof(buf));
1315 }
1316
1317 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1318 {
1319         /* Hardware does not support an input mode */
1320         return 0;
1321 }
1322
1323 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1324 {
1325         /* Hardware does not support an input mode */
1326         return -ENOTSUPP;
1327 }
1328
1329 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1330                                         int value)
1331 {
1332         return 0;
1333 }
1334
1335 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1336                                   unsigned long config)
1337 {
1338         struct usb_serial *serial = gpiochip_get_data(gc);
1339         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1340         enum pin_config_param param = pinconf_to_config_param(config);
1341
1342         /* Succeed only if in correct mode (this can't be set at runtime) */
1343         if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1344             (priv->gpio_mode & BIT(gpio)))
1345                 return 0;
1346
1347         if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1348             !(priv->gpio_mode & BIT(gpio)))
1349                 return 0;
1350
1351         return -ENOTSUPP;
1352 }
1353
1354 /*
1355  * This function is for configuring GPIO using shared pins, where other signals
1356  * are made unavailable by configuring the use of GPIO. This is believed to be
1357  * only applicable to the cp2105 at this point, the other devices supported by
1358  * this driver that provide GPIO do so in a way that does not impact other
1359  * signals and are thus expected to have very different initialisation.
1360  */
1361 static int cp2105_shared_gpio_init(struct usb_serial *serial)
1362 {
1363         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1364         struct cp210x_pin_mode mode;
1365         struct cp210x_config config;
1366         u8 intf_num = cp210x_interface_num(serial);
1367         int result;
1368
1369         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1370                                           CP210X_GET_DEVICEMODE, &mode,
1371                                           sizeof(mode));
1372         if (result < 0)
1373                 return result;
1374
1375         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1376                                           CP210X_GET_PORTCONFIG, &config,
1377                                           sizeof(config));
1378         if (result < 0)
1379                 return result;
1380
1381         /*  2 banks of GPIO - One for the pins taken from each serial port */
1382         if (intf_num == 0) {
1383                 if (mode.eci == CP210X_PIN_MODE_MODEM)
1384                         return 0;
1385
1386                 priv->config = config.eci_cfg;
1387                 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
1388                                                 CP210X_ECI_GPIO_MODE_MASK) >>
1389                                                 CP210X_ECI_GPIO_MODE_OFFSET);
1390                 priv->gc.ngpio = 2;
1391         } else if (intf_num == 1) {
1392                 if (mode.sci == CP210X_PIN_MODE_MODEM)
1393                         return 0;
1394
1395                 priv->config = config.sci_cfg;
1396                 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
1397                                                 CP210X_SCI_GPIO_MODE_MASK) >>
1398                                                 CP210X_SCI_GPIO_MODE_OFFSET);
1399                 priv->gc.ngpio = 3;
1400         } else {
1401                 return -ENODEV;
1402         }
1403
1404         priv->gc.label = "cp210x";
1405         priv->gc.request = cp210x_gpio_request;
1406         priv->gc.get_direction = cp210x_gpio_direction_get;
1407         priv->gc.direction_input = cp210x_gpio_direction_input;
1408         priv->gc.direction_output = cp210x_gpio_direction_output;
1409         priv->gc.get = cp210x_gpio_get;
1410         priv->gc.set = cp210x_gpio_set;
1411         priv->gc.set_config = cp210x_gpio_set_config;
1412         priv->gc.owner = THIS_MODULE;
1413         priv->gc.parent = &serial->interface->dev;
1414         priv->gc.base = -1;
1415         priv->gc.can_sleep = true;
1416
1417         result = gpiochip_add_data(&priv->gc, serial);
1418         if (!result)
1419                 priv->gpio_registered = true;
1420
1421         return result;
1422 }
1423
1424 static void cp210x_gpio_remove(struct usb_serial *serial)
1425 {
1426         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1427
1428         if (priv->gpio_registered) {
1429                 gpiochip_remove(&priv->gc);
1430                 priv->gpio_registered = false;
1431         }
1432 }
1433
1434 #else
1435
1436 static int cp2105_shared_gpio_init(struct usb_serial *serial)
1437 {
1438         return 0;
1439 }
1440
1441 static void cp210x_gpio_remove(struct usb_serial *serial)
1442 {
1443         /* Nothing to do */
1444 }
1445
1446 #endif
1447
1448 static int cp210x_port_probe(struct usb_serial_port *port)
1449 {
1450         struct usb_serial *serial = port->serial;
1451         struct cp210x_port_private *port_priv;
1452         int ret;
1453
1454         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1455         if (!port_priv)
1456                 return -ENOMEM;
1457
1458         port_priv->bInterfaceNumber = cp210x_interface_num(serial);
1459
1460         usb_set_serial_port_data(port, port_priv);
1461
1462         ret = cp210x_detect_swapped_line_ctl(port);
1463         if (ret) {
1464                 kfree(port_priv);
1465                 return ret;
1466         }
1467
1468         return 0;
1469 }
1470
1471 static int cp210x_port_remove(struct usb_serial_port *port)
1472 {
1473         struct cp210x_port_private *port_priv;
1474
1475         port_priv = usb_get_serial_port_data(port);
1476         kfree(port_priv);
1477
1478         return 0;
1479 }
1480
1481 static int cp210x_attach(struct usb_serial *serial)
1482 {
1483         int result;
1484         struct cp210x_serial_private *priv;
1485
1486         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1487         if (!priv)
1488                 return -ENOMEM;
1489
1490         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1491                                           CP210X_GET_PARTNUM, &priv->partnum,
1492                                           sizeof(priv->partnum));
1493         if (result < 0)
1494                 goto err_free_priv;
1495
1496         usb_set_serial_data(serial, priv);
1497
1498         if (priv->partnum == CP210X_PARTNUM_CP2105) {
1499                 result = cp2105_shared_gpio_init(serial);
1500                 if (result < 0) {
1501                         dev_err(&serial->interface->dev,
1502                                 "GPIO initialisation failed, continuing without GPIO support\n");
1503                 }
1504         }
1505
1506         return 0;
1507 err_free_priv:
1508         kfree(priv);
1509
1510         return result;
1511 }
1512
1513 static void cp210x_disconnect(struct usb_serial *serial)
1514 {
1515         cp210x_gpio_remove(serial);
1516 }
1517
1518 static void cp210x_release(struct usb_serial *serial)
1519 {
1520         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1521
1522         cp210x_gpio_remove(serial);
1523
1524         kfree(priv);
1525 }
1526
1527 module_usb_serial_driver(serial_drivers, id_table);
1528
1529 MODULE_DESCRIPTION(DRIVER_DESC);
1530 MODULE_LICENSE("GPL");