drivers/usb/serial/cp210x.c

   1 /*
   2  * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
   3  *
   4  * Copyright (C) 2005 Craig Shelley ([email protected])
   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 [email protected]. RTSCTS hardware flow
  12  * control thanks to Munir Nassar [email protected]
  13  *
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/errno.h>
  18 #include <linux/slab.h>
  19 #include <linux/tty.h>
  20 #include <linux/tty_flip.h>
  21 #include <linux/module.h>
  22 #include <linux/moduleparam.h>
  23 #include <linux/usb.h>
  24 #include <linux/uaccess.h>
  25 #include <linux/usb/serial.h>
  26 #include <linux/gpio/driver.h>
  27 #include <linux/bitops.h>
  28 #include <linux/mutex.h>
  29
  30 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
  31
  32 /*
  33  * Function Prototypes
  34  */
  35 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
  36 static void cp210x_close(struct usb_serial_port *);
  37 static void cp210x_get_termios(struct tty_struct *, struct usb_serial_port *);
  38 static void cp210x_get_termios_port(struct usb_serial_port *port,
  39         tcflag_t *cflagp, unsigned int *baudp);
  40 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
  41                                                         struct ktermios *);
  42 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
  43                                                         struct ktermios*);
  44 static bool cp210x_tx_empty(struct usb_serial_port *port);
  45 static int cp210x_tiocmget(struct tty_struct *);
  46 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
  47 static int cp210x_tiocmset_port(struct usb_serial_port *port,
  48                 unsigned int, unsigned int);
  49 static void cp210x_break_ctl(struct tty_struct *, int);
  50 static int cp210x_attach(struct usb_serial *);
  51 static void cp210x_disconnect(struct usb_serial *);
  52 static void cp210x_release(struct usb_serial *);
  53 static int cp210x_port_probe(struct usb_serial_port *);
  54 static int cp210x_port_remove(struct usb_serial_port *);
  55 static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
  56
  57 static const struct usb_device_id id_table[] = {
  58         { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
  59         { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
  60         { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  61         { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  62         { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
  63         { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
  64         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
  65         { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
  66         { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
  67         { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
  68         { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
  69         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  70         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
  71         { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
  72         { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
  73         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  74         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  75         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  76         { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
  77         { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
  78         { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
  79         { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
  80         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  81         { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
  82         { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
  83         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
  84         { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
  85         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  86         { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
  87         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  88         { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
  89         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  90         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
  91         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  92         { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
  93         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  94         { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
  95         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
  96         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
  97         { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
  98         { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
  99         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
 100         { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
 101         { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
 102         { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
 103         { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
 104         { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
 105         { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
 106         { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
 107         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
 108         { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
 109         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
 110         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
 111         { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
 112         { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
 113         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
 114         { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
 115         { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
 116         { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
 117         { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
 118         { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
 119         { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
 120         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
 121         { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
 122         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
 123         { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
 124         { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
 125         { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
 126         { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
 127         { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
 128         { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
 129         { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
 130         { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
 131         { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
 132         { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
 133         { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
 134         { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
 135         { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
 136         { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
 137         { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
 138         { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
 139         { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
 140         { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
 141         { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
 142         { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
 143         { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
 144         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 145         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 146         { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
 147         { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
 148         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 149         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 150         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 151         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 152         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 153         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 154         { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
 155         { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
 156         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 157         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 158         { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
 159         { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
 160         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 161         { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
 162         { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
 163         { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
 164         { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
 165         { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
 166         { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
 167         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 168         { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
 169         { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
 170         { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
 171         { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
 172         { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
 173         { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
 174         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
 175         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
 176         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 177         { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
 178         { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
 179         { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
 180         { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
 181         { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
 182         { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
 183         { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
 184         { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
 185         { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
 186         { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
 187         { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
 188         { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
 189         { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
 190         { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
 191         { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
 192         { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
 193         { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
 194         { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
 195         { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
 196         { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
 197         { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
 198         { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
 199         { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
 200         { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
 201         { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
 202         { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
 203         { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
 204         { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
 205         { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
 206         { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
 207         { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
 208         { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
 209         { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
 210         { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
 211         { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
 212         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 213         { } /* Terminating Entry */
 214 };
 215
 216 MODULE_DEVICE_TABLE(usb, id_table);
 217
 218 struct cp210x_serial_private {
 219 #ifdef CONFIG_GPIOLIB
 220         struct gpio_chip        gc;
 221         u8                      config;
 222         u8                      gpio_mode;
 223         bool                    gpio_registered;
 224 #endif
 225         u8                      partnum;
 226 };
 227
 228 struct cp210x_port_private {
 229         __u8                    bInterfaceNumber;
 230         bool                    has_swapped_line_ctl;
 231 };
 232
 233 static struct usb_serial_driver cp210x_device = {
 234         .driver = {
 235                 .owner =        THIS_MODULE,
 236                 .name =         "cp210x",
 237         },
 238         .id_table               = id_table,
 239         .num_ports              = 1,
 240         .bulk_in_size           = 256,
 241         .bulk_out_size          = 256,
 242         .open                   = cp210x_open,
 243         .close                  = cp210x_close,
 244         .break_ctl              = cp210x_break_ctl,
 245         .set_termios            = cp210x_set_termios,
 246         .tx_empty               = cp210x_tx_empty,
 247         .tiocmget               = cp210x_tiocmget,
 248         .tiocmset               = cp210x_tiocmset,
 249         .attach                 = cp210x_attach,
 250         .disconnect             = cp210x_disconnect,
 251         .release                = cp210x_release,
 252         .port_probe             = cp210x_port_probe,
 253         .port_remove            = cp210x_port_remove,
 254         .dtr_rts                = cp210x_dtr_rts
 255 };
 256
 257 static struct usb_serial_driver * const serial_drivers[] = {
 258         &cp210x_device, NULL
 259 };
 260
 261 /* Config request types */
 262 #define REQTYPE_HOST_TO_INTERFACE       0x41
 263 #define REQTYPE_INTERFACE_TO_HOST       0xc1
 264 #define REQTYPE_HOST_TO_DEVICE  0x40
 265 #define REQTYPE_DEVICE_TO_HOST  0xc0
 266
 267 /* Config request codes */
 268 #define CP210X_IFC_ENABLE       0x00
 269 #define CP210X_SET_BAUDDIV      0x01
 270 #define CP210X_GET_BAUDDIV      0x02
 271 #define CP210X_SET_LINE_CTL     0x03
 272 #define CP210X_GET_LINE_CTL     0x04
 273 #define CP210X_SET_BREAK        0x05
 274 #define CP210X_IMM_CHAR         0x06
 275 #define CP210X_SET_MHS          0x07
 276 #define CP210X_GET_MDMSTS       0x08
 277 #define CP210X_SET_XON          0x09
 278 #define CP210X_SET_XOFF         0x0A
 279 #define CP210X_SET_EVENTMASK    0x0B
 280 #define CP210X_GET_EVENTMASK    0x0C
 281 #define CP210X_SET_CHAR         0x0D
 282 #define CP210X_GET_CHARS        0x0E
 283 #define CP210X_GET_PROPS        0x0F
 284 #define CP210X_GET_COMM_STATUS  0x10
 285 #define CP210X_RESET            0x11
 286 #define CP210X_PURGE            0x12
 287 #define CP210X_SET_FLOW         0x13
 288 #define CP210X_GET_FLOW         0x14
 289 #define CP210X_EMBED_EVENTS     0x15
 290 #define CP210X_GET_EVENTSTATE   0x16
 291 #define CP210X_SET_CHARS        0x19
 292 #define CP210X_GET_BAUDRATE     0x1D
 293 #define CP210X_SET_BAUDRATE     0x1E
 294 #define CP210X_VENDOR_SPECIFIC  0xFF
 295
 296 /* CP210X_IFC_ENABLE */
 297 #define UART_ENABLE             0x0001
 298 #define UART_DISABLE            0x0000
 299
 300 /* CP210X_(SET|GET)_BAUDDIV */
 301 #define BAUD_RATE_GEN_FREQ      0x384000
 302
 303 /* CP210X_(SET|GET)_LINE_CTL */
 304 #define BITS_DATA_MASK          0X0f00
 305 #define BITS_DATA_5             0X0500
 306 #define BITS_DATA_6             0X0600
 307 #define BITS_DATA_7             0X0700
 308 #define BITS_DATA_8             0X0800
 309 #define BITS_DATA_9             0X0900
 310
 311 #define BITS_PARITY_MASK        0x00f0
 312 #define BITS_PARITY_NONE        0x0000
 313 #define BITS_PARITY_ODD         0x0010
 314 #define BITS_PARITY_EVEN        0x0020
 315 #define BITS_PARITY_MARK        0x0030
 316 #define BITS_PARITY_SPACE       0x0040
 317
 318 #define BITS_STOP_MASK          0x000f
 319 #define BITS_STOP_1             0x0000
 320 #define BITS_STOP_1_5           0x0001
 321 #define BITS_STOP_2             0x0002
 322
 323 /* CP210X_SET_BREAK */
 324 #define BREAK_ON                0x0001
 325 #define BREAK_OFF               0x0000
 326
 327 /* CP210X_(SET_MHS|GET_MDMSTS) */
 328 #define CONTROL_DTR             0x0001
 329 #define CONTROL_RTS             0x0002
 330 #define CONTROL_CTS             0x0010
 331 #define CONTROL_DSR             0x0020
 332 #define CONTROL_RING            0x0040
 333 #define CONTROL_DCD             0x0080
 334 #define CONTROL_WRITE_DTR       0x0100
 335 #define CONTROL_WRITE_RTS       0x0200
 336
 337 /* CP210X_VENDOR_SPECIFIC values */
 338 #define CP210X_READ_LATCH       0x00C2
 339 #define CP210X_GET_PARTNUM      0x370B
 340 #define CP210X_GET_PORTCONFIG   0x370C
 341 #define CP210X_GET_DEVICEMODE   0x3711
 342 #define CP210X_WRITE_LATCH      0x37E1
 343
 344 /* Part number definitions */
 345 #define CP210X_PARTNUM_CP2101   0x01
 346 #define CP210X_PARTNUM_CP2102   0x02
 347 #define CP210X_PARTNUM_CP2103   0x03
 348 #define CP210X_PARTNUM_CP2104   0x04
 349 #define CP210X_PARTNUM_CP2105   0x05
 350 #define CP210X_PARTNUM_CP2108   0x08
 351
 352 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
 353 struct cp210x_comm_status {
 354         __le32   ulErrors;
 355         __le32   ulHoldReasons;
 356         __le32   ulAmountInInQueue;
 357         __le32   ulAmountInOutQueue;
 358         u8       bEofReceived;
 359         u8       bWaitForImmediate;
 360         u8       bReserved;
 361 } __packed;
 362
 363 /*
 364  * CP210X_PURGE - 16 bits passed in wValue of USB request.
 365  * SiLabs app note AN571 gives a strange description of the 4 bits:
 366  * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
 367  * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
 368  */
 369 #define PURGE_ALL               0x000f
 370
 371 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
 372 struct cp210x_flow_ctl {
 373         __le32  ulControlHandshake;
 374         __le32  ulFlowReplace;
 375         __le32  ulXonLimit;
 376         __le32  ulXoffLimit;
 377 } __packed;
 378
 379 /* cp210x_flow_ctl::ulControlHandshake */
 380 #define CP210X_SERIAL_DTR_MASK          GENMASK(1, 0)
 381 #define CP210X_SERIAL_DTR_SHIFT(_mode)  (_mode)
 382 #define CP210X_SERIAL_CTS_HANDSHAKE     BIT(3)
 383 #define CP210X_SERIAL_DSR_HANDSHAKE     BIT(4)
 384 #define CP210X_SERIAL_DCD_HANDSHAKE     BIT(5)
 385 #define CP210X_SERIAL_DSR_SENSITIVITY   BIT(6)
 386
 387 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
 388 #define CP210X_SERIAL_DTR_INACTIVE      0
 389 #define CP210X_SERIAL_DTR_ACTIVE        1
 390 #define CP210X_SERIAL_DTR_FLOW_CTL      2
 391
 392 /* cp210x_flow_ctl::ulFlowReplace */
 393 #define CP210X_SERIAL_AUTO_TRANSMIT     BIT(0)
 394 #define CP210X_SERIAL_AUTO_RECEIVE      BIT(1)
 395 #define CP210X_SERIAL_ERROR_CHAR        BIT(2)
 396 #define CP210X_SERIAL_NULL_STRIPPING    BIT(3)
 397 #define CP210X_SERIAL_BREAK_CHAR        BIT(4)
 398 #define CP210X_SERIAL_RTS_MASK          GENMASK(7, 6)
 399 #define CP210X_SERIAL_RTS_SHIFT(_mode)  (_mode << 6)
 400 #define CP210X_SERIAL_XOFF_CONTINUE     BIT(31)
 401
 402 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
 403 #define CP210X_SERIAL_RTS_INACTIVE      0
 404 #define CP210X_SERIAL_RTS_ACTIVE        1
 405 #define CP210X_SERIAL_RTS_FLOW_CTL      2
 406
 407 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
 408 struct cp210x_pin_mode {
 409         u8      eci;
 410         u8      sci;
 411 } __packed;
 412
 413 #define CP210X_PIN_MODE_MODEM           0
 414 #define CP210X_PIN_MODE_GPIO            BIT(0)
 415
 416 /*
 417  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes.
 418  * Structure needs padding due to unused/unspecified bytes.
 419  */
 420 struct cp210x_config {
 421         __le16  gpio_mode;
 422         u8      __pad0[2];
 423         __le16  reset_state;
 424         u8      __pad1[4];
 425         __le16  suspend_state;
 426         u8      sci_cfg;
 427         u8      eci_cfg;
 428         u8      device_cfg;
 429 } __packed;
 430
 431 /* GPIO modes */
 432 #define CP210X_SCI_GPIO_MODE_OFFSET     9
 433 #define CP210X_SCI_GPIO_MODE_MASK       GENMASK(11, 9)
 434
 435 #define CP210X_ECI_GPIO_MODE_OFFSET     2
 436 #define CP210X_ECI_GPIO_MODE_MASK       GENMASK(3, 2)
 437
 438 /* CP2105 port configuration values */
 439 #define CP2105_GPIO0_TXLED_MODE         BIT(0)
 440 #define CP2105_GPIO1_RXLED_MODE         BIT(1)
 441 #define CP2105_GPIO1_RS485_MODE         BIT(2)
 442
 443 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
 444 struct cp210x_gpio_write {
 445         u8      mask;
 446         u8      state;
 447 } __packed;
 448
 449 /*
 450  * Helper to get interface number when we only have struct usb_serial.
 451  */
 452 static u8 cp210x_interface_num(struct usb_serial *serial)
 453 {
 454         struct usb_host_interface *cur_altsetting;
 455
 456         cur_altsetting = serial->interface->cur_altsetting;
 457
 458         return cur_altsetting->desc.bInterfaceNumber;
 459 }
 460
 461 /*
 462  * Reads a variable-sized block of CP210X_ registers, identified by req.
 463  * Returns data into buf in native USB byte order.
 464  */
 465 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
 466                 void *buf, int bufsize)
 467 {
 468         struct usb_serial *serial = port->serial;
 469         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 470         void *dmabuf;
 471         int result;
 472
 473         dmabuf = kmalloc(bufsize, GFP_KERNEL);
 474         if (!dmabuf) {
 475                 /*
 476                  * FIXME Some callers don't bother to check for error,
 477                  * at least give them consistent junk until they are fixed
 478                  */
 479                 memset(buf, 0, bufsize);
 480                 return -ENOMEM;
 481         }
 482
 483         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 484                         req, REQTYPE_INTERFACE_TO_HOST, 0,
 485                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 486                         USB_CTRL_SET_TIMEOUT);
 487         if (result == bufsize) {
 488                 memcpy(buf, dmabuf, bufsize);
 489                 result = 0;
 490         } else {
 491                 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
 492                                 req, bufsize, result);
 493                 if (result >= 0)
 494                         result = -EIO;
 495
 496                 /*
 497                  * FIXME Some callers don't bother to check for error,
 498                  * at least give them consistent junk until they are fixed
 499                  */
 500                 memset(buf, 0, bufsize);
 501         }
 502
 503         kfree(dmabuf);
 504
 505         return result;
 506 }
 507
 508 /*
 509  * Reads any 32-bit CP210X_ register identified by req.
 510  */
 511 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
 512 {
 513         __le32 le32_val;
 514         int err;
 515
 516         err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
 517         if (err) {
 518                 /*
 519                  * FIXME Some callers don't bother to check for error,
 520                  * at least give them consistent junk until they are fixed
 521                  */
 522                 *val = 0;
 523                 return err;
 524         }
 525
 526         *val = le32_to_cpu(le32_val);
 527
 528         return 0;
 529 }
 530
 531 /*
 532  * Reads any 16-bit CP210X_ register identified by req.
 533  */
 534 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
 535 {
 536         __le16 le16_val;
 537         int err;
 538
 539         err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
 540         if (err)
 541                 return err;
 542
 543         *val = le16_to_cpu(le16_val);
 544
 545         return 0;
 546 }
 547
 548 /*
 549  * Reads any 8-bit CP210X_ register identified by req.
 550  */
 551 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
 552 {
 553         return cp210x_read_reg_block(port, req, val, sizeof(*val));
 554 }
 555
 556 /*
 557  * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
 558  * Returns data into buf in native USB byte order.
 559  */
 560 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
 561                                     void *buf, int bufsize)
 562 {
 563         void *dmabuf;
 564         int result;
 565
 566         dmabuf = kmalloc(bufsize, GFP_KERNEL);
 567         if (!dmabuf)
 568                 return -ENOMEM;
 569
 570         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 571                                  CP210X_VENDOR_SPECIFIC, type, val,
 572                                  cp210x_interface_num(serial), dmabuf, bufsize,
 573                                  USB_CTRL_GET_TIMEOUT);
 574         if (result == bufsize) {
 575                 memcpy(buf, dmabuf, bufsize);
 576                 result = 0;
 577         } else {
 578                 dev_err(&serial->interface->dev,
 579                         "failed to get vendor val 0x%04x size %d: %d\n", val,
 580                         bufsize, result);
 581                 if (result >= 0)
 582                         result = -EIO;
 583         }
 584
 585         kfree(dmabuf);
 586
 587         return result;
 588 }
 589
 590 /*
 591  * Writes any 16-bit CP210X_ register (req) whose value is passed
 592  * entirely in the wValue field of the USB request.
 593  */
 594 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
 595 {
 596         struct usb_serial *serial = port->serial;
 597         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 598         int result;
 599
 600         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 601                         req, REQTYPE_HOST_TO_INTERFACE, val,
 602                         port_priv->bInterfaceNumber, NULL, 0,
 603                         USB_CTRL_SET_TIMEOUT);
 604         if (result < 0) {
 605                 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
 606                                 req, result);
 607         }
 608
 609         return result;
 610 }
 611
 612 /*
 613  * Writes a variable-sized block of CP210X_ registers, identified by req.
 614  * Data in buf must be in native USB byte order.
 615  */
 616 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
 617                 void *buf, int bufsize)
 618 {
 619         struct usb_serial *serial = port->serial;
 620         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 621         void *dmabuf;
 622         int result;
 623
 624         dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
 625         if (!dmabuf)
 626                 return -ENOMEM;
 627
 628         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 629                         req, REQTYPE_HOST_TO_INTERFACE, 0,
 630                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 631                         USB_CTRL_SET_TIMEOUT);
 632
 633         kfree(dmabuf);
 634
 635         if (result == bufsize) {
 636                 result = 0;
 637         } else {
 638                 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
 639                                 req, bufsize, result);
 640                 if (result >= 0)
 641                         result = -EIO;
 642         }
 643
 644         return result;
 645 }
 646
 647 /*
 648  * Writes any 32-bit CP210X_ register identified by req.
 649  */
 650 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
 651 {
 652         __le32 le32_val;
 653
 654         le32_val = cpu_to_le32(val);
 655
 656         return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
 657 }
 658
 659 #ifdef CONFIG_GPIOLIB
 660 /*
 661  * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
 662  * Data in buf must be in native USB byte order.
 663  */
 664 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
 665                                      u16 val, void *buf, int bufsize)
 666 {
 667         void *dmabuf;
 668         int result;
 669
 670         dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
 671         if (!dmabuf)
 672                 return -ENOMEM;
 673
 674         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 675                                  CP210X_VENDOR_SPECIFIC, type, val,
 676                                  cp210x_interface_num(serial), dmabuf, bufsize,
 677                                  USB_CTRL_SET_TIMEOUT);
 678
 679         kfree(dmabuf);
 680
 681         if (result == bufsize) {
 682                 result = 0;
 683         } else {
 684                 dev_err(&serial->interface->dev,
 685                         "failed to set vendor val 0x%04x size %d: %d\n", val,
 686                         bufsize, result);
 687                 if (result >= 0)
 688                         result = -EIO;
 689         }
 690
 691         return result;
 692 }
 693 #endif
 694
 695 /*
 696  * Detect CP2108 GET_LINE_CTL bug and activate workaround.
 697  * Write a known good value 0x800, read it back.
 698  * If it comes back swapped the bug is detected.
 699  * Preserve the original register value.
 700  */
 701 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
 702 {
 703         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 704         u16 line_ctl_save;
 705         u16 line_ctl_test;
 706         int err;
 707
 708         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
 709         if (err)
 710                 return err;
 711
 712         err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
 713         if (err)
 714                 return err;
 715
 716         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
 717         if (err)
 718                 return err;
 719
 720         if (line_ctl_test == 8) {
 721                 port_priv->has_swapped_line_ctl = true;
 722                 line_ctl_save = swab16(line_ctl_save);
 723         }
 724
 725         return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
 726 }
 727
 728 /*
 729  * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
 730  * to workaround cp2108 bug and get correct value.
 731  */
 732 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
 733 {
 734         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 735         int err;
 736
 737         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
 738         if (err)
 739                 return err;
 740
 741         /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
 742         if (port_priv->has_swapped_line_ctl)
 743                 *ctl = swab16(*ctl);
 744
 745         return 0;
 746 }
 747
 748 /*
 749  * cp210x_quantise_baudrate
 750  * Quantises the baud rate as per AN205 Table 1
 751  */
 752 static unsigned int cp210x_quantise_baudrate(unsigned int baud)
 753 {
 754         if (baud <= 300)
 755                 baud = 300;
 756         else if (baud <= 600)      baud = 600;
 757         else if (baud <= 1200)     baud = 1200;
 758         else if (baud <= 1800)     baud = 1800;
 759         else if (baud <= 2400)     baud = 2400;
 760         else if (baud <= 4000)     baud = 4000;
 761         else if (baud <= 4803)     baud = 4800;
 762         else if (baud <= 7207)     baud = 7200;
 763         else if (baud <= 9612)     baud = 9600;
 764         else if (baud <= 14428)    baud = 14400;
 765         else if (baud <= 16062)    baud = 16000;
 766         else if (baud <= 19250)    baud = 19200;
 767         else if (baud <= 28912)    baud = 28800;
 768         else if (baud <= 38601)    baud = 38400;
 769         else if (baud <= 51558)    baud = 51200;
 770         else if (baud <= 56280)    baud = 56000;
 771         else if (baud <= 58053)    baud = 57600;
 772         else if (baud <= 64111)    baud = 64000;
 773         else if (baud <= 77608)    baud = 76800;
 774         else if (baud <= 117028)   baud = 115200;
 775         else if (baud <= 129347)   baud = 128000;
 776         else if (baud <= 156868)   baud = 153600;
 777         else if (baud <= 237832)   baud = 230400;
 778         else if (baud <= 254234)   baud = 250000;
 779         else if (baud <= 273066)   baud = 256000;
 780         else if (baud <= 491520)   baud = 460800;
 781         else if (baud <= 567138)   baud = 500000;
 782         else if (baud <= 670254)   baud = 576000;
 783         else if (baud < 1000000)
 784                 baud = 921600;
 785         else if (baud > 2000000)
 786                 baud = 2000000;
 787         return baud;
 788 }
 789
 790 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 791 {
 792         int result;
 793
 794         result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
 795         if (result) {
 796                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
 797                 return result;
 798         }
 799
 800         /* Configure the termios structure */
 801         cp210x_get_termios(tty, port);
 802
 803         /* The baud rate must be initialised on cp2104 */
 804         if (tty)
 805                 cp210x_change_speed(tty, port, NULL);
 806
 807         return usb_serial_generic_open(tty, port);
 808 }
 809
 810 static void cp210x_close(struct usb_serial_port *port)
 811 {
 812         usb_serial_generic_close(port);
 813
 814         /* Clear both queues; cp2108 needs this to avoid an occasional hang */
 815         cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
 816
 817         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 818 }
 819
 820 /*
 821  * Read how many bytes are waiting in the TX queue.
 822  */
 823 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
 824                 u32 *count)
 825 {
 826         struct usb_serial *serial = port->serial;
 827         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 828         struct cp210x_comm_status *sts;
 829         int result;
 830
 831         sts = kmalloc(sizeof(*sts), GFP_KERNEL);
 832         if (!sts)
 833                 return -ENOMEM;
 834
 835         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 836                         CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
 837                         0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
 838                         USB_CTRL_GET_TIMEOUT);
 839         if (result == sizeof(*sts)) {
 840                 *count = le32_to_cpu(sts->ulAmountInOutQueue);
 841                 result = 0;
 842         } else {
 843                 dev_err(&port->dev, "failed to get comm status: %d\n", result);
 844                 if (result >= 0)
 845                         result = -EIO;
 846         }
 847
 848         kfree(sts);
 849
 850         return result;
 851 }
 852
 853 static bool cp210x_tx_empty(struct usb_serial_port *port)
 854 {
 855         int err;
 856         u32 count;
 857
 858         err = cp210x_get_tx_queue_byte_count(port, &count);
 859         if (err)
 860                 return true;
 861
 862         return !count;
 863 }
 864
 865 /*
 866  * cp210x_get_termios
 867  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 868  * from the device, corrects any unsupported values, and configures the
 869  * termios structure to reflect the state of the device
 870  */
 871 static void cp210x_get_termios(struct tty_struct *tty,
 872         struct usb_serial_port *port)
 873 {
 874         unsigned int baud;
 875
 876         if (tty) {
 877                 cp210x_get_termios_port(tty->driver_data,
 878                         &tty->termios.c_cflag, &baud);
 879                 tty_encode_baud_rate(tty, baud, baud);
 880         } else {
 881                 tcflag_t cflag;
 882                 cflag = 0;
 883                 cp210x_get_termios_port(port, &cflag, &baud);
 884         }
 885 }
 886
 887 /*
 888  * cp210x_get_termios_port
 889  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
 890  */
 891 static void cp210x_get_termios_port(struct usb_serial_port *port,
 892         tcflag_t *cflagp, unsigned int *baudp)
 893 {
 894         struct device *dev = &port->dev;
 895         tcflag_t cflag;
 896         struct cp210x_flow_ctl flow_ctl;
 897         u32 baud;
 898         u16 bits;
 899         u32 ctl_hs;
 900
 901         cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
 902
 903         dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
 904         *baudp = baud;
 905
 906         cflag = *cflagp;
 907
 908         cp210x_get_line_ctl(port, &bits);
 909         cflag &= ~CSIZE;
 910         switch (bits & BITS_DATA_MASK) {
 911         case BITS_DATA_5:
 912                 dev_dbg(dev, "%s - data bits = 5\n", __func__);
 913                 cflag |= CS5;
 914                 break;
 915         case BITS_DATA_6:
 916                 dev_dbg(dev, "%s - data bits = 6\n", __func__);
 917                 cflag |= CS6;
 918                 break;
 919         case BITS_DATA_7:
 920                 dev_dbg(dev, "%s - data bits = 7\n", __func__);
 921                 cflag |= CS7;
 922                 break;
 923         case BITS_DATA_8:
 924                 dev_dbg(dev, "%s - data bits = 8\n", __func__);
 925                 cflag |= CS8;
 926                 break;
 927         case BITS_DATA_9:
 928                 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
 929                 cflag |= CS8;
 930                 bits &= ~BITS_DATA_MASK;
 931                 bits |= BITS_DATA_8;
 932                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 933                 break;
 934         default:
 935                 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
 936                 cflag |= CS8;
 937                 bits &= ~BITS_DATA_MASK;
 938                 bits |= BITS_DATA_8;
 939                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 940                 break;
 941         }
 942
 943         switch (bits & BITS_PARITY_MASK) {
 944         case BITS_PARITY_NONE:
 945                 dev_dbg(dev, "%s - parity = NONE\n", __func__);
 946                 cflag &= ~PARENB;
 947                 break;
 948         case BITS_PARITY_ODD:
 949                 dev_dbg(dev, "%s - parity = ODD\n", __func__);
 950                 cflag |= (PARENB|PARODD);
 951                 break;
 952         case BITS_PARITY_EVEN:
 953                 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
 954                 cflag &= ~PARODD;
 955                 cflag |= PARENB;
 956                 break;
 957         case BITS_PARITY_MARK:
 958                 dev_dbg(dev, "%s - parity = MARK\n", __func__);
 959                 cflag |= (PARENB|PARODD|CMSPAR);
 960                 break;
 961         case BITS_PARITY_SPACE:
 962                 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
 963                 cflag &= ~PARODD;
 964                 cflag |= (PARENB|CMSPAR);
 965                 break;
 966         default:
 967                 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
 968                 cflag &= ~PARENB;
 969                 bits &= ~BITS_PARITY_MASK;
 970                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 971                 break;
 972         }
 973
 974         cflag &= ~CSTOPB;
 975         switch (bits & BITS_STOP_MASK) {
 976         case BITS_STOP_1:
 977                 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
 978                 break;
 979         case BITS_STOP_1_5:
 980                 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
 981                 bits &= ~BITS_STOP_MASK;
 982                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 983                 break;
 984         case BITS_STOP_2:
 985                 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
 986                 cflag |= CSTOPB;
 987                 break;
 988         default:
 989                 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
 990                 bits &= ~BITS_STOP_MASK;
 991                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 992                 break;
 993         }
 994
 995         cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
 996                         sizeof(flow_ctl));
 997         ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
 998         if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
 999                 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1000                 cflag |= CRTSCTS;
1001         } else {
1002                 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1003                 cflag &= ~CRTSCTS;
1004         }
1005
1006         *cflagp = cflag;
1007 }
1008
1009 /*
1010  * CP2101 supports the following baud rates:
1011  *
1012  *      300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1013  *      38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1014  *
1015  * CP2102 and CP2103 support the following additional rates:
1016  *
1017  *      4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1018  *      576000
1019  *
1020  * The device will map a requested rate to a supported one, but the result
1021  * of requests for rates greater than 1053257 is undefined (see AN205).
1022  *
1023  * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1024  * respectively, with an error less than 1%. The actual rates are determined
1025  * by
1026  *
1027  *      div = round(freq / (2 x prescale x request))
1028  *      actual = freq / (2 x prescale x div)
1029  *
1030  * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1031  * or 1 otherwise.
1032  * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1033  * otherwise.
1034  */
1035 static void cp210x_change_speed(struct tty_struct *tty,
1036                 struct usb_serial_port *port, struct ktermios *old_termios)
1037 {
1038         u32 baud;
1039
1040         baud = tty->termios.c_ospeed;
1041
1042         /* This maps the requested rate to a rate valid on cp2102 or cp2103,
1043          * or to an arbitrary rate in [1M,2M].
1044          *
1045          * NOTE: B0 is not implemented.
1046          */
1047         baud = cp210x_quantise_baudrate(baud);
1048
1049         dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1050         if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1051                 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1052                 if (old_termios)
1053                         baud = old_termios->c_ospeed;
1054                 else
1055                         baud = 9600;
1056         }
1057
1058         tty_encode_baud_rate(tty, baud, baud);
1059 }
1060
1061 static void cp210x_set_termios(struct tty_struct *tty,
1062                 struct usb_serial_port *port, struct ktermios *old_termios)
1063 {
1064         struct device *dev = &port->dev;
1065         unsigned int cflag, old_cflag;
1066         u16 bits;
1067
1068         cflag = tty->termios.c_cflag;
1069         old_cflag = old_termios->c_cflag;
1070
1071         if (tty->termios.c_ospeed != old_termios->c_ospeed)
1072                 cp210x_change_speed(tty, port, old_termios);
1073
1074         /* If the number of data bits is to be updated */
1075         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
1076                 cp210x_get_line_ctl(port, &bits);
1077                 bits &= ~BITS_DATA_MASK;
1078                 switch (cflag & CSIZE) {
1079                 case CS5:
1080                         bits |= BITS_DATA_5;
1081                         dev_dbg(dev, "%s - data bits = 5\n", __func__);
1082                         break;
1083                 case CS6:
1084                         bits |= BITS_DATA_6;
1085                         dev_dbg(dev, "%s - data bits = 6\n", __func__);
1086                         break;
1087                 case CS7:
1088                         bits |= BITS_DATA_7;
1089                         dev_dbg(dev, "%s - data bits = 7\n", __func__);
1090                         break;
1091                 case CS8:
1092                 default:
1093                         bits |= BITS_DATA_8;
1094                         dev_dbg(dev, "%s - data bits = 8\n", __func__);
1095                         break;
1096                 }
1097                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1098                         dev_dbg(dev, "Number of data bits requested not supported by device\n");
1099         }
1100
1101         if ((cflag     & (PARENB|PARODD|CMSPAR)) !=
1102             (old_cflag & (PARENB|PARODD|CMSPAR))) {
1103                 cp210x_get_line_ctl(port, &bits);
1104                 bits &= ~BITS_PARITY_MASK;
1105                 if (cflag & PARENB) {
1106                         if (cflag & CMSPAR) {
1107                                 if (cflag & PARODD) {
1108                                         bits |= BITS_PARITY_MARK;
1109                                         dev_dbg(dev, "%s - parity = MARK\n", __func__);
1110                                 } else {
1111                                         bits |= BITS_PARITY_SPACE;
1112                                         dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1113                                 }
1114                         } else {
1115                                 if (cflag & PARODD) {
1116                                         bits |= BITS_PARITY_ODD;
1117                                         dev_dbg(dev, "%s - parity = ODD\n", __func__);
1118                                 } else {
1119                                         bits |= BITS_PARITY_EVEN;
1120                                         dev_dbg(dev, "%s - parity = EVEN\n", __func__);
1121                                 }
1122                         }
1123                 }
1124                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1125                         dev_dbg(dev, "Parity mode not supported by device\n");
1126         }
1127
1128         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
1129                 cp210x_get_line_ctl(port, &bits);
1130                 bits &= ~BITS_STOP_MASK;
1131                 if (cflag & CSTOPB) {
1132                         bits |= BITS_STOP_2;
1133                         dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1134                 } else {
1135                         bits |= BITS_STOP_1;
1136                         dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1137                 }
1138                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1139                         dev_dbg(dev, "Number of stop bits requested not supported by device\n");
1140         }
1141
1142         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
1143                 struct cp210x_flow_ctl flow_ctl;
1144                 u32 ctl_hs;
1145                 u32 flow_repl;
1146
1147                 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1148                                 sizeof(flow_ctl));
1149                 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1150                 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1151                 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1152                                 __func__, ctl_hs, flow_repl);
1153
1154                 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1155                 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1156                 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1157                 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1158                 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1159                 if (cflag & CRTSCTS) {
1160                         ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1161
1162                         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1163                         flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1164                                         CP210X_SERIAL_RTS_FLOW_CTL);
1165                         dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1166                 } else {
1167                         ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1168
1169                         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1170                         flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1171                                         CP210X_SERIAL_RTS_ACTIVE);
1172                         dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1173                 }
1174
1175                 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1176                                 __func__, ctl_hs, flow_repl);
1177                 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1178                 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1179                 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1180                                 sizeof(flow_ctl));
1181         }
1182
1183 }
1184
1185 static int cp210x_tiocmset(struct tty_struct *tty,
1186                 unsigned int set, unsigned int clear)
1187 {
1188         struct usb_serial_port *port = tty->driver_data;
1189         return cp210x_tiocmset_port(port, set, clear);
1190 }
1191
1192 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1193                 unsigned int set, unsigned int clear)
1194 {
1195         u16 control = 0;
1196
1197         if (set & TIOCM_RTS) {
1198                 control |= CONTROL_RTS;
1199                 control |= CONTROL_WRITE_RTS;
1200         }
1201         if (set & TIOCM_DTR) {
1202                 control |= CONTROL_DTR;
1203                 control |= CONTROL_WRITE_DTR;
1204         }
1205         if (clear & TIOCM_RTS) {
1206                 control &= ~CONTROL_RTS;
1207                 control |= CONTROL_WRITE_RTS;
1208         }
1209         if (clear & TIOCM_DTR) {
1210                 control &= ~CONTROL_DTR;
1211                 control |= CONTROL_WRITE_DTR;
1212         }
1213
1214         dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1215
1216         return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1217 }
1218
1219 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1220 {
1221         if (on)
1222                 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1223         else
1224                 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1225 }
1226
1227 static int cp210x_tiocmget(struct tty_struct *tty)
1228 {
1229         struct usb_serial_port *port = tty->driver_data;
1230         u8 control;
1231         int result;
1232
1233         result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1234         if (result)
1235                 return result;
1236
1237         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1238                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1239                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1240                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1241                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
1242                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
1243
1244         dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1245
1246         return result;
1247 }
1248
1249 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1250 {
1251         struct usb_serial_port *port = tty->driver_data;
1252         u16 state;
1253
1254         if (break_state == 0)
1255                 state = BREAK_OFF;
1256         else
1257                 state = BREAK_ON;
1258         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1259                 state == BREAK_OFF ? "off" : "on");
1260         cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1261 }
1262
1263 #ifdef CONFIG_GPIOLIB
1264 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset)
1265 {
1266         struct usb_serial *serial = gpiochip_get_data(gc);
1267         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1268
1269         switch (offset) {
1270         case 0:
1271                 if (priv->config & CP2105_GPIO0_TXLED_MODE)
1272                         return -ENODEV;
1273                 break;
1274         case 1:
1275                 if (priv->config & (CP2105_GPIO1_RXLED_MODE |
1276                                     CP2105_GPIO1_RS485_MODE))
1277                         return -ENODEV;
1278                 break;
1279         }
1280
1281         return 0;
1282 }
1283
1284 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1285 {
1286         struct usb_serial *serial = gpiochip_get_data(gc);
1287         int result;
1288         u8 buf;
1289
1290         result = cp210x_read_vendor_block(serial, REQTYPE_INTERFACE_TO_HOST,
1291                                           CP210X_READ_LATCH, &buf, sizeof(buf));
1292         if (result < 0)
1293                 return result;
1294
1295         return !!(buf & BIT(gpio));
1296 }
1297
1298 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1299 {
1300         struct usb_serial *serial = gpiochip_get_data(gc);
1301         struct cp210x_gpio_write buf;
1302
1303         if (value == 1)
1304                 buf.state = BIT(gpio);
1305         else
1306                 buf.state = 0;
1307
1308         buf.mask = BIT(gpio);
1309
1310         cp210x_write_vendor_block(serial, REQTYPE_HOST_TO_INTERFACE,
1311                                   CP210X_WRITE_LATCH, &buf, sizeof(buf));
1312 }
1313
1314 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1315 {
1316         /* Hardware does not support an input mode */
1317         return 0;
1318 }
1319
1320 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1321 {
1322         /* Hardware does not support an input mode */
1323         return -ENOTSUPP;
1324 }
1325
1326 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1327                                         int value)
1328 {
1329         return 0;
1330 }
1331
1332 static int cp210x_gpio_set_single_ended(struct gpio_chip *gc, unsigned int gpio,
1333                                         enum single_ended_mode mode)
1334 {
1335         struct usb_serial *serial = gpiochip_get_data(gc);
1336         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1337
1338         /* Succeed only if in correct mode (this can't be set at runtime) */
1339         if ((mode == LINE_MODE_PUSH_PULL) && (priv->gpio_mode & BIT(gpio)))
1340                 return 0;
1341
1342         if ((mode == LINE_MODE_OPEN_DRAIN) && !(priv->gpio_mode & BIT(gpio)))
1343                 return 0;
1344
1345         return -ENOTSUPP;
1346 }
1347
1348 /*
1349  * This function is for configuring GPIO using shared pins, where other signals
1350  * are made unavailable by configuring the use of GPIO. This is believed to be
1351  * only applicable to the cp2105 at this point, the other devices supported by
1352  * this driver that provide GPIO do so in a way that does not impact other
1353  * signals and are thus expected to have very different initialisation.
1354  */
1355 static int cp2105_shared_gpio_init(struct usb_serial *serial)
1356 {
1357         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1358         struct cp210x_pin_mode mode;
1359         struct cp210x_config config;
1360         u8 intf_num = cp210x_interface_num(serial);
1361         int result;
1362
1363         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1364                                           CP210X_GET_DEVICEMODE, &mode,
1365                                           sizeof(mode));
1366         if (result < 0)
1367                 return result;
1368
1369         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1370                                           CP210X_GET_PORTCONFIG, &config,
1371                                           sizeof(config));
1372         if (result < 0)
1373                 return result;
1374
1375         /*  2 banks of GPIO - One for the pins taken from each serial port */
1376         if (intf_num == 0) {
1377                 if (mode.eci == CP210X_PIN_MODE_MODEM)
1378                         return 0;
1379
1380                 priv->config = config.eci_cfg;
1381                 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
1382                                                 CP210X_ECI_GPIO_MODE_MASK) >>
1383                                                 CP210X_ECI_GPIO_MODE_OFFSET);
1384                 priv->gc.ngpio = 2;
1385         } else if (intf_num == 1) {
1386                 if (mode.sci == CP210X_PIN_MODE_MODEM)
1387                         return 0;
1388
1389                 priv->config = config.sci_cfg;
1390                 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
1391                                                 CP210X_SCI_GPIO_MODE_MASK) >>
1392                                                 CP210X_SCI_GPIO_MODE_OFFSET);
1393                 priv->gc.ngpio = 3;
1394         } else {
1395                 return -ENODEV;
1396         }
1397
1398         priv->gc.label = "cp210x";
1399         priv->gc.request = cp210x_gpio_request;
1400         priv->gc.get_direction = cp210x_gpio_direction_get;
1401         priv->gc.direction_input = cp210x_gpio_direction_input;
1402         priv->gc.direction_output = cp210x_gpio_direction_output;
1403         priv->gc.get = cp210x_gpio_get;
1404         priv->gc.set = cp210x_gpio_set;
1405         priv->gc.set_single_ended = cp210x_gpio_set_single_ended;
1406         priv->gc.owner = THIS_MODULE;
1407         priv->gc.parent = &serial->interface->dev;
1408         priv->gc.base = -1;
1409         priv->gc.can_sleep = true;
1410
1411         result = gpiochip_add_data(&priv->gc, serial);
1412         if (!result)
1413                 priv->gpio_registered = true;
1414
1415         return result;
1416 }
1417
1418 static void cp210x_gpio_remove(struct usb_serial *serial)
1419 {
1420         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1421
1422         if (priv->gpio_registered) {
1423                 gpiochip_remove(&priv->gc);
1424                 priv->gpio_registered = false;
1425         }
1426 }
1427
1428 #else
1429
1430 static int cp2105_shared_gpio_init(struct usb_serial *serial)
1431 {
1432         return 0;
1433 }
1434
1435 static void cp210x_gpio_remove(struct usb_serial *serial)
1436 {
1437         /* Nothing to do */
1438 }
1439
1440 #endif
1441
1442 static int cp210x_port_probe(struct usb_serial_port *port)
1443 {
1444         struct usb_serial *serial = port->serial;
1445         struct cp210x_port_private *port_priv;
1446         int ret;
1447
1448         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1449         if (!port_priv)
1450                 return -ENOMEM;
1451
1452         port_priv->bInterfaceNumber = cp210x_interface_num(serial);
1453
1454         usb_set_serial_port_data(port, port_priv);
1455
1456         ret = cp210x_detect_swapped_line_ctl(port);
1457         if (ret) {
1458                 kfree(port_priv);
1459                 return ret;
1460         }
1461
1462         return 0;
1463 }
1464
1465 static int cp210x_port_remove(struct usb_serial_port *port)
1466 {
1467         struct cp210x_port_private *port_priv;
1468
1469         port_priv = usb_get_serial_port_data(port);
1470         kfree(port_priv);
1471
1472         return 0;
1473 }
1474
1475 static int cp210x_attach(struct usb_serial *serial)
1476 {
1477         int result;
1478         struct cp210x_serial_private *priv;
1479
1480         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1481         if (!priv)
1482                 return -ENOMEM;
1483
1484         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1485                                           CP210X_GET_PARTNUM, &priv->partnum,
1486                                           sizeof(priv->partnum));
1487         if (result < 0)
1488                 goto err_free_priv;
1489
1490         usb_set_serial_data(serial, priv);
1491
1492         if (priv->partnum == CP210X_PARTNUM_CP2105) {
1493                 result = cp2105_shared_gpio_init(serial);
1494                 if (result < 0) {
1495                         dev_err(&serial->interface->dev,
1496                                 "GPIO initialisation failed, continuing without GPIO support\n");
1497                 }
1498         }
1499
1500         return 0;
1501 err_free_priv:
1502         kfree(priv);
1503
1504         return result;
1505 }
1506
1507 static void cp210x_disconnect(struct usb_serial *serial)
1508 {
1509         cp210x_gpio_remove(serial);
1510 }
1511
1512 static void cp210x_release(struct usb_serial *serial)
1513 {
1514         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1515
1516         cp210x_gpio_remove(serial);
1517
1518         kfree(priv);
1519 }
1520
1521 module_usb_serial_driver(serial_drivers, id_table);
1522
1523 MODULE_DESCRIPTION(DRIVER_DESC);
1524 MODULE_LICENSE("GPL");