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, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
 146         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 147         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 148         { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
 149         { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
 150         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 151         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 152         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 153         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 154         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 155         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 156         { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
 157         { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
 158         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 159         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 160         { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
 161         { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
 162         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 163         { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
 164         { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
 165         { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
 166         { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
 167         { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
 168         { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
 169         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 170         { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
 171         { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
 172         { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
 173         { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
 174         { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
 175         { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
 176         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
 177         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
 178         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 179         { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
 180         { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
 181         { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
 182         { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
 183         { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
 184         { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
 185         { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
 186         { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
 187         { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
 188         { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
 189         { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
 190         { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
 191         { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
 192         { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
 193         { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
 194         { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
 195         { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
 196         { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
 197         { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
 198         { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
 199         { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
 200         { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
 201         { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
 202         { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
 203         { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
 204         { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
 205         { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
 206         { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
 207         { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
 208         { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
 209         { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
 210         { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
 211         { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
 212         { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
 213         { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
 214         { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
 215         { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
 216         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 217         { } /* Terminating Entry */
 218 };
 219
 220 MODULE_DEVICE_TABLE(usb, id_table);
 221
 222 struct cp210x_serial_private {
 223 #ifdef CONFIG_GPIOLIB
 224         struct gpio_chip        gc;
 225         u8                      config;
 226         u8                      gpio_mode;
 227         bool                    gpio_registered;
 228 #endif
 229         u8                      partnum;
 230 };
 231
 232 struct cp210x_port_private {
 233         __u8                    bInterfaceNumber;
 234         bool                    has_swapped_line_ctl;
 235 };
 236
 237 static struct usb_serial_driver cp210x_device = {
 238         .driver = {
 239                 .owner =        THIS_MODULE,
 240                 .name =         "cp210x",
 241         },
 242         .id_table               = id_table,
 243         .num_ports              = 1,
 244         .bulk_in_size           = 256,
 245         .bulk_out_size          = 256,
 246         .open                   = cp210x_open,
 247         .close                  = cp210x_close,
 248         .break_ctl              = cp210x_break_ctl,
 249         .set_termios            = cp210x_set_termios,
 250         .tx_empty               = cp210x_tx_empty,
 251         .tiocmget               = cp210x_tiocmget,
 252         .tiocmset               = cp210x_tiocmset,
 253         .attach                 = cp210x_attach,
 254         .disconnect             = cp210x_disconnect,
 255         .release                = cp210x_release,
 256         .port_probe             = cp210x_port_probe,
 257         .port_remove            = cp210x_port_remove,
 258         .dtr_rts                = cp210x_dtr_rts
 259 };
 260
 261 static struct usb_serial_driver * const serial_drivers[] = {
 262         &cp210x_device, NULL
 263 };
 264
 265 /* Config request types */
 266 #define REQTYPE_HOST_TO_INTERFACE       0x41
 267 #define REQTYPE_INTERFACE_TO_HOST       0xc1
 268 #define REQTYPE_HOST_TO_DEVICE  0x40
 269 #define REQTYPE_DEVICE_TO_HOST  0xc0
 270
 271 /* Config request codes */
 272 #define CP210X_IFC_ENABLE       0x00
 273 #define CP210X_SET_BAUDDIV      0x01
 274 #define CP210X_GET_BAUDDIV      0x02
 275 #define CP210X_SET_LINE_CTL     0x03
 276 #define CP210X_GET_LINE_CTL     0x04
 277 #define CP210X_SET_BREAK        0x05
 278 #define CP210X_IMM_CHAR         0x06
 279 #define CP210X_SET_MHS          0x07
 280 #define CP210X_GET_MDMSTS       0x08
 281 #define CP210X_SET_XON          0x09
 282 #define CP210X_SET_XOFF         0x0A
 283 #define CP210X_SET_EVENTMASK    0x0B
 284 #define CP210X_GET_EVENTMASK    0x0C
 285 #define CP210X_SET_CHAR         0x0D
 286 #define CP210X_GET_CHARS        0x0E
 287 #define CP210X_GET_PROPS        0x0F
 288 #define CP210X_GET_COMM_STATUS  0x10
 289 #define CP210X_RESET            0x11
 290 #define CP210X_PURGE            0x12
 291 #define CP210X_SET_FLOW         0x13
 292 #define CP210X_GET_FLOW         0x14
 293 #define CP210X_EMBED_EVENTS     0x15
 294 #define CP210X_GET_EVENTSTATE   0x16
 295 #define CP210X_SET_CHARS        0x19
 296 #define CP210X_GET_BAUDRATE     0x1D
 297 #define CP210X_SET_BAUDRATE     0x1E
 298 #define CP210X_VENDOR_SPECIFIC  0xFF
 299
 300 /* CP210X_IFC_ENABLE */
 301 #define UART_ENABLE             0x0001
 302 #define UART_DISABLE            0x0000
 303
 304 /* CP210X_(SET|GET)_BAUDDIV */
 305 #define BAUD_RATE_GEN_FREQ      0x384000
 306
 307 /* CP210X_(SET|GET)_LINE_CTL */
 308 #define BITS_DATA_MASK          0X0f00
 309 #define BITS_DATA_5             0X0500
 310 #define BITS_DATA_6             0X0600
 311 #define BITS_DATA_7             0X0700
 312 #define BITS_DATA_8             0X0800
 313 #define BITS_DATA_9             0X0900
 314
 315 #define BITS_PARITY_MASK        0x00f0
 316 #define BITS_PARITY_NONE        0x0000
 317 #define BITS_PARITY_ODD         0x0010
 318 #define BITS_PARITY_EVEN        0x0020
 319 #define BITS_PARITY_MARK        0x0030
 320 #define BITS_PARITY_SPACE       0x0040
 321
 322 #define BITS_STOP_MASK          0x000f
 323 #define BITS_STOP_1             0x0000
 324 #define BITS_STOP_1_5           0x0001
 325 #define BITS_STOP_2             0x0002
 326
 327 /* CP210X_SET_BREAK */
 328 #define BREAK_ON                0x0001
 329 #define BREAK_OFF               0x0000
 330
 331 /* CP210X_(SET_MHS|GET_MDMSTS) */
 332 #define CONTROL_DTR             0x0001
 333 #define CONTROL_RTS             0x0002
 334 #define CONTROL_CTS             0x0010
 335 #define CONTROL_DSR             0x0020
 336 #define CONTROL_RING            0x0040
 337 #define CONTROL_DCD             0x0080
 338 #define CONTROL_WRITE_DTR       0x0100
 339 #define CONTROL_WRITE_RTS       0x0200
 340
 341 /* CP210X_VENDOR_SPECIFIC values */
 342 #define CP210X_READ_LATCH       0x00C2
 343 #define CP210X_GET_PARTNUM      0x370B
 344 #define CP210X_GET_PORTCONFIG   0x370C
 345 #define CP210X_GET_DEVICEMODE   0x3711
 346 #define CP210X_WRITE_LATCH      0x37E1
 347
 348 /* Part number definitions */
 349 #define CP210X_PARTNUM_CP2101   0x01
 350 #define CP210X_PARTNUM_CP2102   0x02
 351 #define CP210X_PARTNUM_CP2103   0x03
 352 #define CP210X_PARTNUM_CP2104   0x04
 353 #define CP210X_PARTNUM_CP2105   0x05
 354 #define CP210X_PARTNUM_CP2108   0x08
 355
 356 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
 357 struct cp210x_comm_status {
 358         __le32   ulErrors;
 359         __le32   ulHoldReasons;
 360         __le32   ulAmountInInQueue;
 361         __le32   ulAmountInOutQueue;
 362         u8       bEofReceived;
 363         u8       bWaitForImmediate;
 364         u8       bReserved;
 365 } __packed;
 366
 367 /*
 368  * CP210X_PURGE - 16 bits passed in wValue of USB request.
 369  * SiLabs app note AN571 gives a strange description of the 4 bits:
 370  * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
 371  * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
 372  */
 373 #define PURGE_ALL               0x000f
 374
 375 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
 376 struct cp210x_flow_ctl {
 377         __le32  ulControlHandshake;
 378         __le32  ulFlowReplace;
 379         __le32  ulXonLimit;
 380         __le32  ulXoffLimit;
 381 } __packed;
 382
 383 /* cp210x_flow_ctl::ulControlHandshake */
 384 #define CP210X_SERIAL_DTR_MASK          GENMASK(1, 0)
 385 #define CP210X_SERIAL_DTR_SHIFT(_mode)  (_mode)
 386 #define CP210X_SERIAL_CTS_HANDSHAKE     BIT(3)
 387 #define CP210X_SERIAL_DSR_HANDSHAKE     BIT(4)
 388 #define CP210X_SERIAL_DCD_HANDSHAKE     BIT(5)
 389 #define CP210X_SERIAL_DSR_SENSITIVITY   BIT(6)
 390
 391 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
 392 #define CP210X_SERIAL_DTR_INACTIVE      0
 393 #define CP210X_SERIAL_DTR_ACTIVE        1
 394 #define CP210X_SERIAL_DTR_FLOW_CTL      2
 395
 396 /* cp210x_flow_ctl::ulFlowReplace */
 397 #define CP210X_SERIAL_AUTO_TRANSMIT     BIT(0)
 398 #define CP210X_SERIAL_AUTO_RECEIVE      BIT(1)
 399 #define CP210X_SERIAL_ERROR_CHAR        BIT(2)
 400 #define CP210X_SERIAL_NULL_STRIPPING    BIT(3)
 401 #define CP210X_SERIAL_BREAK_CHAR        BIT(4)
 402 #define CP210X_SERIAL_RTS_MASK          GENMASK(7, 6)
 403 #define CP210X_SERIAL_RTS_SHIFT(_mode)  (_mode << 6)
 404 #define CP210X_SERIAL_XOFF_CONTINUE     BIT(31)
 405
 406 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
 407 #define CP210X_SERIAL_RTS_INACTIVE      0
 408 #define CP210X_SERIAL_RTS_ACTIVE        1
 409 #define CP210X_SERIAL_RTS_FLOW_CTL      2
 410
 411 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
 412 struct cp210x_pin_mode {
 413         u8      eci;
 414         u8      sci;
 415 } __packed;
 416
 417 #define CP210X_PIN_MODE_MODEM           0
 418 #define CP210X_PIN_MODE_GPIO            BIT(0)
 419
 420 /*
 421  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes.
 422  * Structure needs padding due to unused/unspecified bytes.
 423  */
 424 struct cp210x_config {
 425         __le16  gpio_mode;
 426         u8      __pad0[2];
 427         __le16  reset_state;
 428         u8      __pad1[4];
 429         __le16  suspend_state;
 430         u8      sci_cfg;
 431         u8      eci_cfg;
 432         u8      device_cfg;
 433 } __packed;
 434
 435 /* GPIO modes */
 436 #define CP210X_SCI_GPIO_MODE_OFFSET     9
 437 #define CP210X_SCI_GPIO_MODE_MASK       GENMASK(11, 9)
 438
 439 #define CP210X_ECI_GPIO_MODE_OFFSET     2
 440 #define CP210X_ECI_GPIO_MODE_MASK       GENMASK(3, 2)
 441
 442 /* CP2105 port configuration values */
 443 #define CP2105_GPIO0_TXLED_MODE         BIT(0)
 444 #define CP2105_GPIO1_RXLED_MODE         BIT(1)
 445 #define CP2105_GPIO1_RS485_MODE         BIT(2)
 446
 447 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
 448 struct cp210x_gpio_write {
 449         u8      mask;
 450         u8      state;
 451 } __packed;
 452
 453 /*
 454  * Helper to get interface number when we only have struct usb_serial.
 455  */
 456 static u8 cp210x_interface_num(struct usb_serial *serial)
 457 {
 458         struct usb_host_interface *cur_altsetting;
 459
 460         cur_altsetting = serial->interface->cur_altsetting;
 461
 462         return cur_altsetting->desc.bInterfaceNumber;
 463 }
 464
 465 /*
 466  * Reads a variable-sized block of CP210X_ registers, identified by req.
 467  * Returns data into buf in native USB byte order.
 468  */
 469 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
 470                 void *buf, int bufsize)
 471 {
 472         struct usb_serial *serial = port->serial;
 473         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 474         void *dmabuf;
 475         int result;
 476
 477         dmabuf = kmalloc(bufsize, GFP_KERNEL);
 478         if (!dmabuf) {
 479                 /*
 480                  * FIXME Some callers don't bother to check for error,
 481                  * at least give them consistent junk until they are fixed
 482                  */
 483                 memset(buf, 0, bufsize);
 484                 return -ENOMEM;
 485         }
 486
 487         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 488                         req, REQTYPE_INTERFACE_TO_HOST, 0,
 489                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 490                         USB_CTRL_SET_TIMEOUT);
 491         if (result == bufsize) {
 492                 memcpy(buf, dmabuf, bufsize);
 493                 result = 0;
 494         } else {
 495                 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
 496                                 req, bufsize, result);
 497                 if (result >= 0)
 498                         result = -EIO;
 499
 500                 /*
 501                  * FIXME Some callers don't bother to check for error,
 502                  * at least give them consistent junk until they are fixed
 503                  */
 504                 memset(buf, 0, bufsize);
 505         }
 506
 507         kfree(dmabuf);
 508
 509         return result;
 510 }
 511
 512 /*
 513  * Reads any 32-bit CP210X_ register identified by req.
 514  */
 515 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
 516 {
 517         __le32 le32_val;
 518         int err;
 519
 520         err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
 521         if (err) {
 522                 /*
 523                  * FIXME Some callers don't bother to check for error,
 524                  * at least give them consistent junk until they are fixed
 525                  */
 526                 *val = 0;
 527                 return err;
 528         }
 529
 530         *val = le32_to_cpu(le32_val);
 531
 532         return 0;
 533 }
 534
 535 /*
 536  * Reads any 16-bit CP210X_ register identified by req.
 537  */
 538 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
 539 {
 540         __le16 le16_val;
 541         int err;
 542
 543         err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
 544         if (err)
 545                 return err;
 546
 547         *val = le16_to_cpu(le16_val);
 548
 549         return 0;
 550 }
 551
 552 /*
 553  * Reads any 8-bit CP210X_ register identified by req.
 554  */
 555 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
 556 {
 557         return cp210x_read_reg_block(port, req, val, sizeof(*val));
 558 }
 559
 560 /*
 561  * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
 562  * Returns data into buf in native USB byte order.
 563  */
 564 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
 565                                     void *buf, int bufsize)
 566 {
 567         void *dmabuf;
 568         int result;
 569
 570         dmabuf = kmalloc(bufsize, GFP_KERNEL);
 571         if (!dmabuf)
 572                 return -ENOMEM;
 573
 574         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 575                                  CP210X_VENDOR_SPECIFIC, type, val,
 576                                  cp210x_interface_num(serial), dmabuf, bufsize,
 577                                  USB_CTRL_GET_TIMEOUT);
 578         if (result == bufsize) {
 579                 memcpy(buf, dmabuf, bufsize);
 580                 result = 0;
 581         } else {
 582                 dev_err(&serial->interface->dev,
 583                         "failed to get vendor val 0x%04x size %d: %d\n", val,
 584                         bufsize, result);
 585                 if (result >= 0)
 586                         result = -EIO;
 587         }
 588
 589         kfree(dmabuf);
 590
 591         return result;
 592 }
 593
 594 /*
 595  * Writes any 16-bit CP210X_ register (req) whose value is passed
 596  * entirely in the wValue field of the USB request.
 597  */
 598 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
 599 {
 600         struct usb_serial *serial = port->serial;
 601         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 602         int result;
 603
 604         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 605                         req, REQTYPE_HOST_TO_INTERFACE, val,
 606                         port_priv->bInterfaceNumber, NULL, 0,
 607                         USB_CTRL_SET_TIMEOUT);
 608         if (result < 0) {
 609                 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
 610                                 req, result);
 611         }
 612
 613         return result;
 614 }
 615
 616 /*
 617  * Writes a variable-sized block of CP210X_ registers, identified by req.
 618  * Data in buf must be in native USB byte order.
 619  */
 620 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
 621                 void *buf, int bufsize)
 622 {
 623         struct usb_serial *serial = port->serial;
 624         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 625         void *dmabuf;
 626         int result;
 627
 628         dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
 629         if (!dmabuf)
 630                 return -ENOMEM;
 631
 632         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 633                         req, REQTYPE_HOST_TO_INTERFACE, 0,
 634                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 635                         USB_CTRL_SET_TIMEOUT);
 636
 637         kfree(dmabuf);
 638
 639         if (result == bufsize) {
 640                 result = 0;
 641         } else {
 642                 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
 643                                 req, bufsize, result);
 644                 if (result >= 0)
 645                         result = -EIO;
 646         }
 647
 648         return result;
 649 }
 650
 651 /*
 652  * Writes any 32-bit CP210X_ register identified by req.
 653  */
 654 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
 655 {
 656         __le32 le32_val;
 657
 658         le32_val = cpu_to_le32(val);
 659
 660         return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
 661 }
 662
 663 #ifdef CONFIG_GPIOLIB
 664 /*
 665  * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
 666  * Data in buf must be in native USB byte order.
 667  */
 668 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
 669                                      u16 val, void *buf, int bufsize)
 670 {
 671         void *dmabuf;
 672         int result;
 673
 674         dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
 675         if (!dmabuf)
 676                 return -ENOMEM;
 677
 678         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 679                                  CP210X_VENDOR_SPECIFIC, type, val,
 680                                  cp210x_interface_num(serial), dmabuf, bufsize,
 681                                  USB_CTRL_SET_TIMEOUT);
 682
 683         kfree(dmabuf);
 684
 685         if (result == bufsize) {
 686                 result = 0;
 687         } else {
 688                 dev_err(&serial->interface->dev,
 689                         "failed to set vendor val 0x%04x size %d: %d\n", val,
 690                         bufsize, result);
 691                 if (result >= 0)
 692                         result = -EIO;
 693         }
 694
 695         return result;
 696 }
 697 #endif
 698
 699 /*
 700  * Detect CP2108 GET_LINE_CTL bug and activate workaround.
 701  * Write a known good value 0x800, read it back.
 702  * If it comes back swapped the bug is detected.
 703  * Preserve the original register value.
 704  */
 705 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
 706 {
 707         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 708         u16 line_ctl_save;
 709         u16 line_ctl_test;
 710         int err;
 711
 712         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
 713         if (err)
 714                 return err;
 715
 716         err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
 717         if (err)
 718                 return err;
 719
 720         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
 721         if (err)
 722                 return err;
 723
 724         if (line_ctl_test == 8) {
 725                 port_priv->has_swapped_line_ctl = true;
 726                 line_ctl_save = swab16(line_ctl_save);
 727         }
 728
 729         return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
 730 }
 731
 732 /*
 733  * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
 734  * to workaround cp2108 bug and get correct value.
 735  */
 736 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
 737 {
 738         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 739         int err;
 740
 741         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
 742         if (err)
 743                 return err;
 744
 745         /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
 746         if (port_priv->has_swapped_line_ctl)
 747                 *ctl = swab16(*ctl);
 748
 749         return 0;
 750 }
 751
 752 /*
 753  * cp210x_quantise_baudrate
 754  * Quantises the baud rate as per AN205 Table 1
 755  */
 756 static unsigned int cp210x_quantise_baudrate(unsigned int baud)
 757 {
 758         if (baud <= 300)
 759                 baud = 300;
 760         else if (baud <= 600)      baud = 600;
 761         else if (baud <= 1200)     baud = 1200;
 762         else if (baud <= 1800)     baud = 1800;
 763         else if (baud <= 2400)     baud = 2400;
 764         else if (baud <= 4000)     baud = 4000;
 765         else if (baud <= 4803)     baud = 4800;
 766         else if (baud <= 7207)     baud = 7200;
 767         else if (baud <= 9612)     baud = 9600;
 768         else if (baud <= 14428)    baud = 14400;
 769         else if (baud <= 16062)    baud = 16000;
 770         else if (baud <= 19250)    baud = 19200;
 771         else if (baud <= 28912)    baud = 28800;
 772         else if (baud <= 38601)    baud = 38400;
 773         else if (baud <= 51558)    baud = 51200;
 774         else if (baud <= 56280)    baud = 56000;
 775         else if (baud <= 58053)    baud = 57600;
 776         else if (baud <= 64111)    baud = 64000;
 777         else if (baud <= 77608)    baud = 76800;
 778         else if (baud <= 117028)   baud = 115200;
 779         else if (baud <= 129347)   baud = 128000;
 780         else if (baud <= 156868)   baud = 153600;
 781         else if (baud <= 237832)   baud = 230400;
 782         else if (baud <= 254234)   baud = 250000;
 783         else if (baud <= 273066)   baud = 256000;
 784         else if (baud <= 491520)   baud = 460800;
 785         else if (baud <= 567138)   baud = 500000;
 786         else if (baud <= 670254)   baud = 576000;
 787         else if (baud < 1000000)
 788                 baud = 921600;
 789         else if (baud > 2000000)
 790                 baud = 2000000;
 791         return baud;
 792 }
 793
 794 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 795 {
 796         int result;
 797
 798         result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
 799         if (result) {
 800                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
 801                 return result;
 802         }
 803
 804         /* Configure the termios structure */
 805         cp210x_get_termios(tty, port);
 806
 807         /* The baud rate must be initialised on cp2104 */
 808         if (tty)
 809                 cp210x_change_speed(tty, port, NULL);
 810
 811         return usb_serial_generic_open(tty, port);
 812 }
 813
 814 static void cp210x_close(struct usb_serial_port *port)
 815 {
 816         usb_serial_generic_close(port);
 817
 818         /* Clear both queues; cp2108 needs this to avoid an occasional hang */
 819         cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
 820
 821         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 822 }
 823
 824 /*
 825  * Read how many bytes are waiting in the TX queue.
 826  */
 827 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
 828                 u32 *count)
 829 {
 830         struct usb_serial *serial = port->serial;
 831         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 832         struct cp210x_comm_status *sts;
 833         int result;
 834
 835         sts = kmalloc(sizeof(*sts), GFP_KERNEL);
 836         if (!sts)
 837                 return -ENOMEM;
 838
 839         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 840                         CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
 841                         0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
 842                         USB_CTRL_GET_TIMEOUT);
 843         if (result == sizeof(*sts)) {
 844                 *count = le32_to_cpu(sts->ulAmountInOutQueue);
 845                 result = 0;
 846         } else {
 847                 dev_err(&port->dev, "failed to get comm status: %d\n", result);
 848                 if (result >= 0)
 849                         result = -EIO;
 850         }
 851
 852         kfree(sts);
 853
 854         return result;
 855 }
 856
 857 static bool cp210x_tx_empty(struct usb_serial_port *port)
 858 {
 859         int err;
 860         u32 count;
 861
 862         err = cp210x_get_tx_queue_byte_count(port, &count);
 863         if (err)
 864                 return true;
 865
 866         return !count;
 867 }
 868
 869 /*
 870  * cp210x_get_termios
 871  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 872  * from the device, corrects any unsupported values, and configures the
 873  * termios structure to reflect the state of the device
 874  */
 875 static void cp210x_get_termios(struct tty_struct *tty,
 876         struct usb_serial_port *port)
 877 {
 878         unsigned int baud;
 879
 880         if (tty) {
 881                 cp210x_get_termios_port(tty->driver_data,
 882                         &tty->termios.c_cflag, &baud);
 883                 tty_encode_baud_rate(tty, baud, baud);
 884         } else {
 885                 tcflag_t cflag;
 886                 cflag = 0;
 887                 cp210x_get_termios_port(port, &cflag, &baud);
 888         }
 889 }
 890
 891 /*
 892  * cp210x_get_termios_port
 893  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
 894  */
 895 static void cp210x_get_termios_port(struct usb_serial_port *port,
 896         tcflag_t *cflagp, unsigned int *baudp)
 897 {
 898         struct device *dev = &port->dev;
 899         tcflag_t cflag;
 900         struct cp210x_flow_ctl flow_ctl;
 901         u32 baud;
 902         u16 bits;
 903         u32 ctl_hs;
 904
 905         cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
 906
 907         dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
 908         *baudp = baud;
 909
 910         cflag = *cflagp;
 911
 912         cp210x_get_line_ctl(port, &bits);
 913         cflag &= ~CSIZE;
 914         switch (bits & BITS_DATA_MASK) {
 915         case BITS_DATA_5:
 916                 dev_dbg(dev, "%s - data bits = 5\n", __func__);
 917                 cflag |= CS5;
 918                 break;
 919         case BITS_DATA_6:
 920                 dev_dbg(dev, "%s - data bits = 6\n", __func__);
 921                 cflag |= CS6;
 922                 break;
 923         case BITS_DATA_7:
 924                 dev_dbg(dev, "%s - data bits = 7\n", __func__);
 925                 cflag |= CS7;
 926                 break;
 927         case BITS_DATA_8:
 928                 dev_dbg(dev, "%s - data bits = 8\n", __func__);
 929                 cflag |= CS8;
 930                 break;
 931         case BITS_DATA_9:
 932                 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
 933                 cflag |= CS8;
 934                 bits &= ~BITS_DATA_MASK;
 935                 bits |= BITS_DATA_8;
 936                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 937                 break;
 938         default:
 939                 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
 940                 cflag |= CS8;
 941                 bits &= ~BITS_DATA_MASK;
 942                 bits |= BITS_DATA_8;
 943                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 944                 break;
 945         }
 946
 947         switch (bits & BITS_PARITY_MASK) {
 948         case BITS_PARITY_NONE:
 949                 dev_dbg(dev, "%s - parity = NONE\n", __func__);
 950                 cflag &= ~PARENB;
 951                 break;
 952         case BITS_PARITY_ODD:
 953                 dev_dbg(dev, "%s - parity = ODD\n", __func__);
 954                 cflag |= (PARENB|PARODD);
 955                 break;
 956         case BITS_PARITY_EVEN:
 957                 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
 958                 cflag &= ~PARODD;
 959                 cflag |= PARENB;
 960                 break;
 961         case BITS_PARITY_MARK:
 962                 dev_dbg(dev, "%s - parity = MARK\n", __func__);
 963                 cflag |= (PARENB|PARODD|CMSPAR);
 964                 break;
 965         case BITS_PARITY_SPACE:
 966                 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
 967                 cflag &= ~PARODD;
 968                 cflag |= (PARENB|CMSPAR);
 969                 break;
 970         default:
 971                 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
 972                 cflag &= ~PARENB;
 973                 bits &= ~BITS_PARITY_MASK;
 974                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 975                 break;
 976         }
 977
 978         cflag &= ~CSTOPB;
 979         switch (bits & BITS_STOP_MASK) {
 980         case BITS_STOP_1:
 981                 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
 982                 break;
 983         case BITS_STOP_1_5:
 984                 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
 985                 bits &= ~BITS_STOP_MASK;
 986                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 987                 break;
 988         case BITS_STOP_2:
 989                 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
 990                 cflag |= CSTOPB;
 991                 break;
 992         default:
 993                 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
 994                 bits &= ~BITS_STOP_MASK;
 995                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 996                 break;
 997         }
 998
 999         cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1000                         sizeof(flow_ctl));
1001         ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1002         if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
1003                 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1004                 cflag |= CRTSCTS;
1005         } else {
1006                 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1007                 cflag &= ~CRTSCTS;
1008         }
1009
1010         *cflagp = cflag;
1011 }
1012
1013 /*
1014  * CP2101 supports the following baud rates:
1015  *
1016  *      300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1017  *      38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1018  *
1019  * CP2102 and CP2103 support the following additional rates:
1020  *
1021  *      4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1022  *      576000
1023  *
1024  * The device will map a requested rate to a supported one, but the result
1025  * of requests for rates greater than 1053257 is undefined (see AN205).
1026  *
1027  * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1028  * respectively, with an error less than 1%. The actual rates are determined
1029  * by
1030  *
1031  *      div = round(freq / (2 x prescale x request))
1032  *      actual = freq / (2 x prescale x div)
1033  *
1034  * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1035  * or 1 otherwise.
1036  * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1037  * otherwise.
1038  */
1039 static void cp210x_change_speed(struct tty_struct *tty,
1040                 struct usb_serial_port *port, struct ktermios *old_termios)
1041 {
1042         u32 baud;
1043
1044         baud = tty->termios.c_ospeed;
1045
1046         /* This maps the requested rate to a rate valid on cp2102 or cp2103,
1047          * or to an arbitrary rate in [1M,2M].
1048          *
1049          * NOTE: B0 is not implemented.
1050          */
1051         baud = cp210x_quantise_baudrate(baud);
1052
1053         dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1054         if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1055                 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1056                 if (old_termios)
1057                         baud = old_termios->c_ospeed;
1058                 else
1059                         baud = 9600;
1060         }
1061
1062         tty_encode_baud_rate(tty, baud, baud);
1063 }
1064
1065 static void cp210x_set_termios(struct tty_struct *tty,
1066                 struct usb_serial_port *port, struct ktermios *old_termios)
1067 {
1068         struct device *dev = &port->dev;
1069         unsigned int cflag, old_cflag;
1070         u16 bits;
1071
1072         cflag = tty->termios.c_cflag;
1073         old_cflag = old_termios->c_cflag;
1074
1075         if (tty->termios.c_ospeed != old_termios->c_ospeed)
1076                 cp210x_change_speed(tty, port, old_termios);
1077
1078         /* If the number of data bits is to be updated */
1079         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
1080                 cp210x_get_line_ctl(port, &bits);
1081                 bits &= ~BITS_DATA_MASK;
1082                 switch (cflag & CSIZE) {
1083                 case CS5:
1084                         bits |= BITS_DATA_5;
1085                         dev_dbg(dev, "%s - data bits = 5\n", __func__);
1086                         break;
1087                 case CS6:
1088                         bits |= BITS_DATA_6;
1089                         dev_dbg(dev, "%s - data bits = 6\n", __func__);
1090                         break;
1091                 case CS7:
1092                         bits |= BITS_DATA_7;
1093                         dev_dbg(dev, "%s - data bits = 7\n", __func__);
1094                         break;
1095                 case CS8:
1096                 default:
1097                         bits |= BITS_DATA_8;
1098                         dev_dbg(dev, "%s - data bits = 8\n", __func__);
1099                         break;
1100                 }
1101                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1102                         dev_dbg(dev, "Number of data bits requested not supported by device\n");
1103         }
1104
1105         if ((cflag     & (PARENB|PARODD|CMSPAR)) !=
1106             (old_cflag & (PARENB|PARODD|CMSPAR))) {
1107                 cp210x_get_line_ctl(port, &bits);
1108                 bits &= ~BITS_PARITY_MASK;
1109                 if (cflag & PARENB) {
1110                         if (cflag & CMSPAR) {
1111                                 if (cflag & PARODD) {
1112                                         bits |= BITS_PARITY_MARK;
1113                                         dev_dbg(dev, "%s - parity = MARK\n", __func__);
1114                                 } else {
1115                                         bits |= BITS_PARITY_SPACE;
1116                                         dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1117                                 }
1118                         } else {
1119                                 if (cflag & PARODD) {
1120                                         bits |= BITS_PARITY_ODD;
1121                                         dev_dbg(dev, "%s - parity = ODD\n", __func__);
1122                                 } else {
1123                                         bits |= BITS_PARITY_EVEN;
1124                                         dev_dbg(dev, "%s - parity = EVEN\n", __func__);
1125                                 }
1126                         }
1127                 }
1128                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1129                         dev_dbg(dev, "Parity mode not supported by device\n");
1130         }
1131
1132         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
1133                 cp210x_get_line_ctl(port, &bits);
1134                 bits &= ~BITS_STOP_MASK;
1135                 if (cflag & CSTOPB) {
1136                         bits |= BITS_STOP_2;
1137                         dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1138                 } else {
1139                         bits |= BITS_STOP_1;
1140                         dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1141                 }
1142                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1143                         dev_dbg(dev, "Number of stop bits requested not supported by device\n");
1144         }
1145
1146         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
1147                 struct cp210x_flow_ctl flow_ctl;
1148                 u32 ctl_hs;
1149                 u32 flow_repl;
1150
1151                 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1152                                 sizeof(flow_ctl));
1153                 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1154                 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1155                 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1156                                 __func__, ctl_hs, flow_repl);
1157
1158                 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1159                 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1160                 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1161                 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1162                 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1163                 if (cflag & CRTSCTS) {
1164                         ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1165
1166                         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1167                         flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1168                                         CP210X_SERIAL_RTS_FLOW_CTL);
1169                         dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1170                 } else {
1171                         ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1172
1173                         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1174                         flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1175                                         CP210X_SERIAL_RTS_ACTIVE);
1176                         dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1177                 }
1178
1179                 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1180                                 __func__, ctl_hs, flow_repl);
1181                 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1182                 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1183                 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1184                                 sizeof(flow_ctl));
1185         }
1186
1187 }
1188
1189 static int cp210x_tiocmset(struct tty_struct *tty,
1190                 unsigned int set, unsigned int clear)
1191 {
1192         struct usb_serial_port *port = tty->driver_data;
1193         return cp210x_tiocmset_port(port, set, clear);
1194 }
1195
1196 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1197                 unsigned int set, unsigned int clear)
1198 {
1199         u16 control = 0;
1200
1201         if (set & TIOCM_RTS) {
1202                 control |= CONTROL_RTS;
1203                 control |= CONTROL_WRITE_RTS;
1204         }
1205         if (set & TIOCM_DTR) {
1206                 control |= CONTROL_DTR;
1207                 control |= CONTROL_WRITE_DTR;
1208         }
1209         if (clear & TIOCM_RTS) {
1210                 control &= ~CONTROL_RTS;
1211                 control |= CONTROL_WRITE_RTS;
1212         }
1213         if (clear & TIOCM_DTR) {
1214                 control &= ~CONTROL_DTR;
1215                 control |= CONTROL_WRITE_DTR;
1216         }
1217
1218         dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1219
1220         return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1221 }
1222
1223 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1224 {
1225         if (on)
1226                 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1227         else
1228                 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1229 }
1230
1231 static int cp210x_tiocmget(struct tty_struct *tty)
1232 {
1233         struct usb_serial_port *port = tty->driver_data;
1234         u8 control;
1235         int result;
1236
1237         result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1238         if (result)
1239                 return result;
1240
1241         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1242                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1243                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1244                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1245                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
1246                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
1247
1248         dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1249
1250         return result;
1251 }
1252
1253 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1254 {
1255         struct usb_serial_port *port = tty->driver_data;
1256         u16 state;
1257
1258         if (break_state == 0)
1259                 state = BREAK_OFF;
1260         else
1261                 state = BREAK_ON;
1262         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1263                 state == BREAK_OFF ? "off" : "on");
1264         cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1265 }
1266
1267 #ifdef CONFIG_GPIOLIB
1268 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset)
1269 {
1270         struct usb_serial *serial = gpiochip_get_data(gc);
1271         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1272
1273         switch (offset) {
1274         case 0:
1275                 if (priv->config & CP2105_GPIO0_TXLED_MODE)
1276                         return -ENODEV;
1277                 break;
1278         case 1:
1279                 if (priv->config & (CP2105_GPIO1_RXLED_MODE |
1280                                     CP2105_GPIO1_RS485_MODE))
1281                         return -ENODEV;
1282                 break;
1283         }
1284
1285         return 0;
1286 }
1287
1288 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1289 {
1290         struct usb_serial *serial = gpiochip_get_data(gc);
1291         int result;
1292         u8 buf;
1293
1294         result = cp210x_read_vendor_block(serial, REQTYPE_INTERFACE_TO_HOST,
1295                                           CP210X_READ_LATCH, &buf, sizeof(buf));
1296         if (result < 0)
1297                 return result;
1298
1299         return !!(buf & BIT(gpio));
1300 }
1301
1302 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1303 {
1304         struct usb_serial *serial = gpiochip_get_data(gc);
1305         struct cp210x_gpio_write buf;
1306
1307         if (value == 1)
1308                 buf.state = BIT(gpio);
1309         else
1310                 buf.state = 0;
1311
1312         buf.mask = BIT(gpio);
1313
1314         cp210x_write_vendor_block(serial, REQTYPE_HOST_TO_INTERFACE,
1315                                   CP210X_WRITE_LATCH, &buf, sizeof(buf));
1316 }
1317
1318 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1319 {
1320         /* Hardware does not support an input mode */
1321         return 0;
1322 }
1323
1324 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1325 {
1326         /* Hardware does not support an input mode */
1327         return -ENOTSUPP;
1328 }
1329
1330 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1331                                         int value)
1332 {
1333         return 0;
1334 }
1335
1336 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1337                                   unsigned long config)
1338 {
1339         struct usb_serial *serial = gpiochip_get_data(gc);
1340         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1341         enum pin_config_param param = pinconf_to_config_param(config);
1342
1343         /* Succeed only if in correct mode (this can't be set at runtime) */
1344         if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1345             (priv->gpio_mode & BIT(gpio)))
1346                 return 0;
1347
1348         if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1349             !(priv->gpio_mode & BIT(gpio)))
1350                 return 0;
1351
1352         return -ENOTSUPP;
1353 }
1354
1355 /*
1356  * This function is for configuring GPIO using shared pins, where other signals
1357  * are made unavailable by configuring the use of GPIO. This is believed to be
1358  * only applicable to the cp2105 at this point, the other devices supported by
1359  * this driver that provide GPIO do so in a way that does not impact other
1360  * signals and are thus expected to have very different initialisation.
1361  */
1362 static int cp2105_shared_gpio_init(struct usb_serial *serial)
1363 {
1364         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1365         struct cp210x_pin_mode mode;
1366         struct cp210x_config config;
1367         u8 intf_num = cp210x_interface_num(serial);
1368         int result;
1369
1370         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1371                                           CP210X_GET_DEVICEMODE, &mode,
1372                                           sizeof(mode));
1373         if (result < 0)
1374                 return result;
1375
1376         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1377                                           CP210X_GET_PORTCONFIG, &config,
1378                                           sizeof(config));
1379         if (result < 0)
1380                 return result;
1381
1382         /*  2 banks of GPIO - One for the pins taken from each serial port */
1383         if (intf_num == 0) {
1384                 if (mode.eci == CP210X_PIN_MODE_MODEM)
1385                         return 0;
1386
1387                 priv->config = config.eci_cfg;
1388                 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
1389                                                 CP210X_ECI_GPIO_MODE_MASK) >>
1390                                                 CP210X_ECI_GPIO_MODE_OFFSET);
1391                 priv->gc.ngpio = 2;
1392         } else if (intf_num == 1) {
1393                 if (mode.sci == CP210X_PIN_MODE_MODEM)
1394                         return 0;
1395
1396                 priv->config = config.sci_cfg;
1397                 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
1398                                                 CP210X_SCI_GPIO_MODE_MASK) >>
1399                                                 CP210X_SCI_GPIO_MODE_OFFSET);
1400                 priv->gc.ngpio = 3;
1401         } else {
1402                 return -ENODEV;
1403         }
1404
1405         priv->gc.label = "cp210x";
1406         priv->gc.request = cp210x_gpio_request;
1407         priv->gc.get_direction = cp210x_gpio_direction_get;
1408         priv->gc.direction_input = cp210x_gpio_direction_input;
1409         priv->gc.direction_output = cp210x_gpio_direction_output;
1410         priv->gc.get = cp210x_gpio_get;
1411         priv->gc.set = cp210x_gpio_set;
1412         priv->gc.set_config = cp210x_gpio_set_config;
1413         priv->gc.owner = THIS_MODULE;
1414         priv->gc.parent = &serial->interface->dev;
1415         priv->gc.base = -1;
1416         priv->gc.can_sleep = true;
1417
1418         result = gpiochip_add_data(&priv->gc, serial);
1419         if (!result)
1420                 priv->gpio_registered = true;
1421
1422         return result;
1423 }
1424
1425 static void cp210x_gpio_remove(struct usb_serial *serial)
1426 {
1427         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1428
1429         if (priv->gpio_registered) {
1430                 gpiochip_remove(&priv->gc);
1431                 priv->gpio_registered = false;
1432         }
1433 }
1434
1435 #else
1436
1437 static int cp2105_shared_gpio_init(struct usb_serial *serial)
1438 {
1439         return 0;
1440 }
1441
1442 static void cp210x_gpio_remove(struct usb_serial *serial)
1443 {
1444         /* Nothing to do */
1445 }
1446
1447 #endif
1448
1449 static int cp210x_port_probe(struct usb_serial_port *port)
1450 {
1451         struct usb_serial *serial = port->serial;
1452         struct cp210x_port_private *port_priv;
1453         int ret;
1454
1455         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1456         if (!port_priv)
1457                 return -ENOMEM;
1458
1459         port_priv->bInterfaceNumber = cp210x_interface_num(serial);
1460
1461         usb_set_serial_port_data(port, port_priv);
1462
1463         ret = cp210x_detect_swapped_line_ctl(port);
1464         if (ret) {
1465                 kfree(port_priv);
1466                 return ret;
1467         }
1468
1469         return 0;
1470 }
1471
1472 static int cp210x_port_remove(struct usb_serial_port *port)
1473 {
1474         struct cp210x_port_private *port_priv;
1475
1476         port_priv = usb_get_serial_port_data(port);
1477         kfree(port_priv);
1478
1479         return 0;
1480 }
1481
1482 static int cp210x_attach(struct usb_serial *serial)
1483 {
1484         int result;
1485         struct cp210x_serial_private *priv;
1486
1487         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1488         if (!priv)
1489                 return -ENOMEM;
1490
1491         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1492                                           CP210X_GET_PARTNUM, &priv->partnum,
1493                                           sizeof(priv->partnum));
1494         if (result < 0)
1495                 goto err_free_priv;
1496
1497         usb_set_serial_data(serial, priv);
1498
1499         if (priv->partnum == CP210X_PARTNUM_CP2105) {
1500                 result = cp2105_shared_gpio_init(serial);
1501                 if (result < 0) {
1502                         dev_err(&serial->interface->dev,
1503                                 "GPIO initialisation failed, continuing without GPIO support\n");
1504                 }
1505         }
1506
1507         return 0;
1508 err_free_priv:
1509         kfree(priv);
1510
1511         return result;
1512 }
1513
1514 static void cp210x_disconnect(struct usb_serial *serial)
1515 {
1516         cp210x_gpio_remove(serial);
1517 }
1518
1519 static void cp210x_release(struct usb_serial *serial)
1520 {
1521         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1522
1523         cp210x_gpio_remove(serial);
1524
1525         kfree(priv);
1526 }
1527
1528 module_usb_serial_driver(serial_drivers, id_table);
1529
1530 MODULE_DESCRIPTION(DRIVER_DESC);
1531 MODULE_LICENSE("GPL");