drivers/usb/serial/cp210x.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
   4  *
   5  * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
   6  *
   7  * Support to set flow control line levels using TIOCMGET and TIOCMSET
   8  * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
   9  * control thanks to Munir Nassar nassarmu@real-time.com
  10  *
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/errno.h>
  15 #include <linux/slab.h>
  16 #include <linux/tty.h>
  17 #include <linux/tty_flip.h>
  18 #include <linux/module.h>
  19 #include <linux/moduleparam.h>
  20 #include <linux/usb.h>
  21 #include <linux/uaccess.h>
  22 #include <linux/usb/serial.h>
  23 #include <linux/gpio/driver.h>
  24 #include <linux/bitops.h>
  25 #include <linux/mutex.h>
  26
  27 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
  28
  29 /*
  30  * Function Prototypes
  31  */
  32 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
  33 static void cp210x_close(struct usb_serial_port *);
  34 static void cp210x_get_termios(struct tty_struct *, struct usb_serial_port *);
  35 static void cp210x_get_termios_port(struct usb_serial_port *port,
  36         tcflag_t *cflagp, unsigned int *baudp);
  37 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
  38                                                         struct ktermios *);
  39 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
  40                                                         struct ktermios*);
  41 static bool cp210x_tx_empty(struct usb_serial_port *port);
  42 static int cp210x_tiocmget(struct tty_struct *);
  43 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
  44 static int cp210x_tiocmset_port(struct usb_serial_port *port,
  45                 unsigned int, unsigned int);
  46 static void cp210x_break_ctl(struct tty_struct *, int);
  47 static int cp210x_attach(struct usb_serial *);
  48 static void cp210x_disconnect(struct usb_serial *);
  49 static void cp210x_release(struct usb_serial *);
  50 static int cp210x_port_probe(struct usb_serial_port *);
  51 static int cp210x_port_remove(struct usb_serial_port *);
  52 static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
  53
  54 static const struct usb_device_id id_table[] = {
  55         { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
  56         { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
  57         { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  58         { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  59         { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
  60         { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
  61         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
  62         { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
  63         { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
  64         { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
  65         { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
  66         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  67         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
  68         { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
  69         { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
  70         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  71         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  72         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  73         { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
  74         { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
  75         { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
  76         { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
  77         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  78         { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
  79         { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
  80         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
  81         { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
  82         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  83         { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
  84         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  85         { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
  86         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  87         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
  88         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  89         { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
  90         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  91         { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
  92         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
  93         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
  94         { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
  95         { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
  96         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
  97         { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
  98         { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
  99         { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
 100         { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
 101         { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
 102         { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
 103         { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
 104         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
 105         { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
 106         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
 107         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
 108         { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
 109         { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
 110         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
 111         { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
 112         { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
 113         { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
 114         { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
 115         { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
 116         { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
 117         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
 118         { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
 119         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
 120         { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
 121         { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
 122         { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
 123         { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
 124         { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
 125         { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
 126         { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
 127         { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */
 128         { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
 129         { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
 130         { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
 131         { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
 132         { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
 133         { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
 134         { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
 135         { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
 136         { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
 137         { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
 138         { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
 139         { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
 140         { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
 141         { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
 142         { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
 143         { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
 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(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */
 159         { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
 160         { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
 161         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 162         { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
 163         { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
 164         { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
 165         { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
 166         { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
 167         { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
 168         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 169         { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
 170         { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
 171         { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
 172         { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
 173         { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
 174         { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
 175         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
 176         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
 177         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 178         { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
 179         { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
 180         { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
 181         { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
 182         { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
 183         { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
 184         { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
 185         { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
 186         { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
 187         { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
 188         { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
 189         { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
 190         { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
 191         { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
 192         { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
 193         { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
 194         { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
 195         { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
 196         { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
 197         { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
 198         { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
 199         { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
 200         { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
 201         { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
 202         { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
 203         { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
 204         { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
 205         { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
 206         { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
 207         { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
 208         { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
 209         { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
 210         { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
 211         { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
 212         { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
 213         { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
 214         { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
 215         { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
 216         { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
 217         { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
 218         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 219         { } /* Terminating Entry */
 220 };
 221
 222 MODULE_DEVICE_TABLE(usb, id_table);
 223
 224 struct cp210x_serial_private {
 225 #ifdef CONFIG_GPIOLIB
 226         struct gpio_chip        gc;
 227         u8                      config;
 228         u8                      gpio_mode;
 229         bool                    gpio_registered;
 230 #endif
 231         u8                      partnum;
 232 };
 233
 234 struct cp210x_port_private {
 235         __u8                    bInterfaceNumber;
 236         bool                    has_swapped_line_ctl;
 237 };
 238
 239 static struct usb_serial_driver cp210x_device = {
 240         .driver = {
 241                 .owner =        THIS_MODULE,
 242                 .name =         "cp210x",
 243         },
 244         .id_table               = id_table,
 245         .num_ports              = 1,
 246         .bulk_in_size           = 256,
 247         .bulk_out_size          = 256,
 248         .open                   = cp210x_open,
 249         .close                  = cp210x_close,
 250         .break_ctl              = cp210x_break_ctl,
 251         .set_termios            = cp210x_set_termios,
 252         .tx_empty               = cp210x_tx_empty,
 253         .tiocmget               = cp210x_tiocmget,
 254         .tiocmset               = cp210x_tiocmset,
 255         .attach                 = cp210x_attach,
 256         .disconnect             = cp210x_disconnect,
 257         .release                = cp210x_release,
 258         .port_probe             = cp210x_port_probe,
 259         .port_remove            = cp210x_port_remove,
 260         .dtr_rts                = cp210x_dtr_rts
 261 };
 262
 263 static struct usb_serial_driver * const serial_drivers[] = {
 264         &cp210x_device, NULL
 265 };
 266
 267 /* Config request types */
 268 #define REQTYPE_HOST_TO_INTERFACE       0x41
 269 #define REQTYPE_INTERFACE_TO_HOST       0xc1
 270 #define REQTYPE_HOST_TO_DEVICE  0x40
 271 #define REQTYPE_DEVICE_TO_HOST  0xc0
 272
 273 /* Config request codes */
 274 #define CP210X_IFC_ENABLE       0x00
 275 #define CP210X_SET_BAUDDIV      0x01
 276 #define CP210X_GET_BAUDDIV      0x02
 277 #define CP210X_SET_LINE_CTL     0x03
 278 #define CP210X_GET_LINE_CTL     0x04
 279 #define CP210X_SET_BREAK        0x05
 280 #define CP210X_IMM_CHAR         0x06
 281 #define CP210X_SET_MHS          0x07
 282 #define CP210X_GET_MDMSTS       0x08
 283 #define CP210X_SET_XON          0x09
 284 #define CP210X_SET_XOFF         0x0A
 285 #define CP210X_SET_EVENTMASK    0x0B
 286 #define CP210X_GET_EVENTMASK    0x0C
 287 #define CP210X_SET_CHAR         0x0D
 288 #define CP210X_GET_CHARS        0x0E
 289 #define CP210X_GET_PROPS        0x0F
 290 #define CP210X_GET_COMM_STATUS  0x10
 291 #define CP210X_RESET            0x11
 292 #define CP210X_PURGE            0x12
 293 #define CP210X_SET_FLOW         0x13
 294 #define CP210X_GET_FLOW         0x14
 295 #define CP210X_EMBED_EVENTS     0x15
 296 #define CP210X_GET_EVENTSTATE   0x16
 297 #define CP210X_SET_CHARS        0x19
 298 #define CP210X_GET_BAUDRATE     0x1D
 299 #define CP210X_SET_BAUDRATE     0x1E
 300 #define CP210X_VENDOR_SPECIFIC  0xFF
 301
 302 /* CP210X_IFC_ENABLE */
 303 #define UART_ENABLE             0x0001
 304 #define UART_DISABLE            0x0000
 305
 306 /* CP210X_(SET|GET)_BAUDDIV */
 307 #define BAUD_RATE_GEN_FREQ      0x384000
 308
 309 /* CP210X_(SET|GET)_LINE_CTL */
 310 #define BITS_DATA_MASK          0X0f00
 311 #define BITS_DATA_5             0X0500
 312 #define BITS_DATA_6             0X0600
 313 #define BITS_DATA_7             0X0700
 314 #define BITS_DATA_8             0X0800
 315 #define BITS_DATA_9             0X0900
 316
 317 #define BITS_PARITY_MASK        0x00f0
 318 #define BITS_PARITY_NONE        0x0000
 319 #define BITS_PARITY_ODD         0x0010
 320 #define BITS_PARITY_EVEN        0x0020
 321 #define BITS_PARITY_MARK        0x0030
 322 #define BITS_PARITY_SPACE       0x0040
 323
 324 #define BITS_STOP_MASK          0x000f
 325 #define BITS_STOP_1             0x0000
 326 #define BITS_STOP_1_5           0x0001
 327 #define BITS_STOP_2             0x0002
 328
 329 /* CP210X_SET_BREAK */
 330 #define BREAK_ON                0x0001
 331 #define BREAK_OFF               0x0000
 332
 333 /* CP210X_(SET_MHS|GET_MDMSTS) */
 334 #define CONTROL_DTR             0x0001
 335 #define CONTROL_RTS             0x0002
 336 #define CONTROL_CTS             0x0010
 337 #define CONTROL_DSR             0x0020
 338 #define CONTROL_RING            0x0040
 339 #define CONTROL_DCD             0x0080
 340 #define CONTROL_WRITE_DTR       0x0100
 341 #define CONTROL_WRITE_RTS       0x0200
 342
 343 /* CP210X_VENDOR_SPECIFIC values */
 344 #define CP210X_READ_LATCH       0x00C2
 345 #define CP210X_GET_PARTNUM      0x370B
 346 #define CP210X_GET_PORTCONFIG   0x370C
 347 #define CP210X_GET_DEVICEMODE   0x3711
 348 #define CP210X_WRITE_LATCH      0x37E1
 349
 350 /* Part number definitions */
 351 #define CP210X_PARTNUM_CP2101   0x01
 352 #define CP210X_PARTNUM_CP2102   0x02
 353 #define CP210X_PARTNUM_CP2103   0x03
 354 #define CP210X_PARTNUM_CP2104   0x04
 355 #define CP210X_PARTNUM_CP2105   0x05
 356 #define CP210X_PARTNUM_CP2108   0x08
 357 #define CP210X_PARTNUM_UNKNOWN  0xFF
 358
 359 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
 360 struct cp210x_comm_status {
 361         __le32   ulErrors;
 362         __le32   ulHoldReasons;
 363         __le32   ulAmountInInQueue;
 364         __le32   ulAmountInOutQueue;
 365         u8       bEofReceived;
 366         u8       bWaitForImmediate;
 367         u8       bReserved;
 368 } __packed;
 369
 370 /*
 371  * CP210X_PURGE - 16 bits passed in wValue of USB request.
 372  * SiLabs app note AN571 gives a strange description of the 4 bits:
 373  * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
 374  * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
 375  */
 376 #define PURGE_ALL               0x000f
 377
 378 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
 379 struct cp210x_flow_ctl {
 380         __le32  ulControlHandshake;
 381         __le32  ulFlowReplace;
 382         __le32  ulXonLimit;
 383         __le32  ulXoffLimit;
 384 } __packed;
 385
 386 /* cp210x_flow_ctl::ulControlHandshake */
 387 #define CP210X_SERIAL_DTR_MASK          GENMASK(1, 0)
 388 #define CP210X_SERIAL_DTR_SHIFT(_mode)  (_mode)
 389 #define CP210X_SERIAL_CTS_HANDSHAKE     BIT(3)
 390 #define CP210X_SERIAL_DSR_HANDSHAKE     BIT(4)
 391 #define CP210X_SERIAL_DCD_HANDSHAKE     BIT(5)
 392 #define CP210X_SERIAL_DSR_SENSITIVITY   BIT(6)
 393
 394 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
 395 #define CP210X_SERIAL_DTR_INACTIVE      0
 396 #define CP210X_SERIAL_DTR_ACTIVE        1
 397 #define CP210X_SERIAL_DTR_FLOW_CTL      2
 398
 399 /* cp210x_flow_ctl::ulFlowReplace */
 400 #define CP210X_SERIAL_AUTO_TRANSMIT     BIT(0)
 401 #define CP210X_SERIAL_AUTO_RECEIVE      BIT(1)
 402 #define CP210X_SERIAL_ERROR_CHAR        BIT(2)
 403 #define CP210X_SERIAL_NULL_STRIPPING    BIT(3)
 404 #define CP210X_SERIAL_BREAK_CHAR        BIT(4)
 405 #define CP210X_SERIAL_RTS_MASK          GENMASK(7, 6)
 406 #define CP210X_SERIAL_RTS_SHIFT(_mode)  (_mode << 6)
 407 #define CP210X_SERIAL_XOFF_CONTINUE     BIT(31)
 408
 409 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
 410 #define CP210X_SERIAL_RTS_INACTIVE      0
 411 #define CP210X_SERIAL_RTS_ACTIVE        1
 412 #define CP210X_SERIAL_RTS_FLOW_CTL      2
 413
 414 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
 415 struct cp210x_pin_mode {
 416         u8      eci;
 417         u8      sci;
 418 } __packed;
 419
 420 #define CP210X_PIN_MODE_MODEM           0
 421 #define CP210X_PIN_MODE_GPIO            BIT(0)
 422
 423 /*
 424  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes.
 425  * Structure needs padding due to unused/unspecified bytes.
 426  */
 427 struct cp210x_config {
 428         __le16  gpio_mode;
 429         u8      __pad0[2];
 430         __le16  reset_state;
 431         u8      __pad1[4];
 432         __le16  suspend_state;
 433         u8      sci_cfg;
 434         u8      eci_cfg;
 435         u8      device_cfg;
 436 } __packed;
 437
 438 /* GPIO modes */
 439 #define CP210X_SCI_GPIO_MODE_OFFSET     9
 440 #define CP210X_SCI_GPIO_MODE_MASK       GENMASK(11, 9)
 441
 442 #define CP210X_ECI_GPIO_MODE_OFFSET     2
 443 #define CP210X_ECI_GPIO_MODE_MASK       GENMASK(3, 2)
 444
 445 /* CP2105 port configuration values */
 446 #define CP2105_GPIO0_TXLED_MODE         BIT(0)
 447 #define CP2105_GPIO1_RXLED_MODE         BIT(1)
 448 #define CP2105_GPIO1_RS485_MODE         BIT(2)
 449
 450 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
 451 struct cp210x_gpio_write {
 452         u8      mask;
 453         u8      state;
 454 } __packed;
 455
 456 /*
 457  * Helper to get interface number when we only have struct usb_serial.
 458  */
 459 static u8 cp210x_interface_num(struct usb_serial *serial)
 460 {
 461         struct usb_host_interface *cur_altsetting;
 462
 463         cur_altsetting = serial->interface->cur_altsetting;
 464
 465         return cur_altsetting->desc.bInterfaceNumber;
 466 }
 467
 468 /*
 469  * Reads a variable-sized block of CP210X_ registers, identified by req.
 470  * Returns data into buf in native USB byte order.
 471  */
 472 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
 473                 void *buf, int bufsize)
 474 {
 475         struct usb_serial *serial = port->serial;
 476         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 477         void *dmabuf;
 478         int result;
 479
 480         dmabuf = kmalloc(bufsize, GFP_KERNEL);
 481         if (!dmabuf) {
 482                 /*
 483                  * FIXME Some callers don't bother to check for error,
 484                  * at least give them consistent junk until they are fixed
 485                  */
 486                 memset(buf, 0, bufsize);
 487                 return -ENOMEM;
 488         }
 489
 490         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 491                         req, REQTYPE_INTERFACE_TO_HOST, 0,
 492                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 493                         USB_CTRL_SET_TIMEOUT);
 494         if (result == bufsize) {
 495                 memcpy(buf, dmabuf, bufsize);
 496                 result = 0;
 497         } else {
 498                 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
 499                                 req, bufsize, result);
 500                 if (result >= 0)
 501                         result = -EIO;
 502
 503                 /*
 504                  * FIXME Some callers don't bother to check for error,
 505                  * at least give them consistent junk until they are fixed
 506                  */
 507                 memset(buf, 0, bufsize);
 508         }
 509
 510         kfree(dmabuf);
 511
 512         return result;
 513 }
 514
 515 /*
 516  * Reads any 32-bit CP210X_ register identified by req.
 517  */
 518 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
 519 {
 520         __le32 le32_val;
 521         int err;
 522
 523         err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
 524         if (err) {
 525                 /*
 526                  * FIXME Some callers don't bother to check for error,
 527                  * at least give them consistent junk until they are fixed
 528                  */
 529                 *val = 0;
 530                 return err;
 531         }
 532
 533         *val = le32_to_cpu(le32_val);
 534
 535         return 0;
 536 }
 537
 538 /*
 539  * Reads any 16-bit CP210X_ register identified by req.
 540  */
 541 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
 542 {
 543         __le16 le16_val;
 544         int err;
 545
 546         err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
 547         if (err)
 548                 return err;
 549
 550         *val = le16_to_cpu(le16_val);
 551
 552         return 0;
 553 }
 554
 555 /*
 556  * Reads any 8-bit CP210X_ register identified by req.
 557  */
 558 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
 559 {
 560         return cp210x_read_reg_block(port, req, val, sizeof(*val));
 561 }
 562
 563 /*
 564  * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
 565  * Returns data into buf in native USB byte order.
 566  */
 567 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
 568                                     void *buf, int bufsize)
 569 {
 570         void *dmabuf;
 571         int result;
 572
 573         dmabuf = kmalloc(bufsize, GFP_KERNEL);
 574         if (!dmabuf)
 575                 return -ENOMEM;
 576
 577         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 578                                  CP210X_VENDOR_SPECIFIC, type, val,
 579                                  cp210x_interface_num(serial), dmabuf, bufsize,
 580                                  USB_CTRL_GET_TIMEOUT);
 581         if (result == bufsize) {
 582                 memcpy(buf, dmabuf, bufsize);
 583                 result = 0;
 584         } else {
 585                 dev_err(&serial->interface->dev,
 586                         "failed to get vendor val 0x%04x size %d: %d\n", val,
 587                         bufsize, result);
 588                 if (result >= 0)
 589                         result = -EIO;
 590         }
 591
 592         kfree(dmabuf);
 593
 594         return result;
 595 }
 596
 597 /*
 598  * Writes any 16-bit CP210X_ register (req) whose value is passed
 599  * entirely in the wValue field of the USB request.
 600  */
 601 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
 602 {
 603         struct usb_serial *serial = port->serial;
 604         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 605         int result;
 606
 607         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 608                         req, REQTYPE_HOST_TO_INTERFACE, val,
 609                         port_priv->bInterfaceNumber, NULL, 0,
 610                         USB_CTRL_SET_TIMEOUT);
 611         if (result < 0) {
 612                 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
 613                                 req, result);
 614         }
 615
 616         return result;
 617 }
 618
 619 /*
 620  * Writes a variable-sized block of CP210X_ registers, identified by req.
 621  * Data in buf must be in native USB byte order.
 622  */
 623 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
 624                 void *buf, int bufsize)
 625 {
 626         struct usb_serial *serial = port->serial;
 627         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 628         void *dmabuf;
 629         int result;
 630
 631         dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
 632         if (!dmabuf)
 633                 return -ENOMEM;
 634
 635         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 636                         req, REQTYPE_HOST_TO_INTERFACE, 0,
 637                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 638                         USB_CTRL_SET_TIMEOUT);
 639
 640         kfree(dmabuf);
 641
 642         if (result == bufsize) {
 643                 result = 0;
 644         } else {
 645                 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
 646                                 req, bufsize, result);
 647                 if (result >= 0)
 648                         result = -EIO;
 649         }
 650
 651         return result;
 652 }
 653
 654 /*
 655  * Writes any 32-bit CP210X_ register identified by req.
 656  */
 657 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
 658 {
 659         __le32 le32_val;
 660
 661         le32_val = cpu_to_le32(val);
 662
 663         return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
 664 }
 665
 666 #ifdef CONFIG_GPIOLIB
 667 /*
 668  * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
 669  * Data in buf must be in native USB byte order.
 670  */
 671 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
 672                                      u16 val, void *buf, int bufsize)
 673 {
 674         void *dmabuf;
 675         int result;
 676
 677         dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
 678         if (!dmabuf)
 679                 return -ENOMEM;
 680
 681         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 682                                  CP210X_VENDOR_SPECIFIC, type, val,
 683                                  cp210x_interface_num(serial), dmabuf, bufsize,
 684                                  USB_CTRL_SET_TIMEOUT);
 685
 686         kfree(dmabuf);
 687
 688         if (result == bufsize) {
 689                 result = 0;
 690         } else {
 691                 dev_err(&serial->interface->dev,
 692                         "failed to set vendor val 0x%04x size %d: %d\n", val,
 693                         bufsize, result);
 694                 if (result >= 0)
 695                         result = -EIO;
 696         }
 697
 698         return result;
 699 }
 700 #endif
 701
 702 /*
 703  * Detect CP2108 GET_LINE_CTL bug and activate workaround.
 704  * Write a known good value 0x800, read it back.
 705  * If it comes back swapped the bug is detected.
 706  * Preserve the original register value.
 707  */
 708 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
 709 {
 710         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 711         u16 line_ctl_save;
 712         u16 line_ctl_test;
 713         int err;
 714
 715         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
 716         if (err)
 717                 return err;
 718
 719         err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
 720         if (err)
 721                 return err;
 722
 723         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
 724         if (err)
 725                 return err;
 726
 727         if (line_ctl_test == 8) {
 728                 port_priv->has_swapped_line_ctl = true;
 729                 line_ctl_save = swab16(line_ctl_save);
 730         }
 731
 732         return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
 733 }
 734
 735 /*
 736  * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
 737  * to workaround cp2108 bug and get correct value.
 738  */
 739 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
 740 {
 741         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 742         int err;
 743
 744         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
 745         if (err)
 746                 return err;
 747
 748         /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
 749         if (port_priv->has_swapped_line_ctl)
 750                 *ctl = swab16(*ctl);
 751
 752         return 0;
 753 }
 754
 755 /*
 756  * cp210x_quantise_baudrate
 757  * Quantises the baud rate as per AN205 Table 1
 758  */
 759 static unsigned int cp210x_quantise_baudrate(unsigned int baud)
 760 {
 761         if (baud <= 300)
 762                 baud = 300;
 763         else if (baud <= 600)      baud = 600;
 764         else if (baud <= 1200)     baud = 1200;
 765         else if (baud <= 1800)     baud = 1800;
 766         else if (baud <= 2400)     baud = 2400;
 767         else if (baud <= 4000)     baud = 4000;
 768         else if (baud <= 4803)     baud = 4800;
 769         else if (baud <= 7207)     baud = 7200;
 770         else if (baud <= 9612)     baud = 9600;
 771         else if (baud <= 14428)    baud = 14400;
 772         else if (baud <= 16062)    baud = 16000;
 773         else if (baud <= 19250)    baud = 19200;
 774         else if (baud <= 28912)    baud = 28800;
 775         else if (baud <= 38601)    baud = 38400;
 776         else if (baud <= 51558)    baud = 51200;
 777         else if (baud <= 56280)    baud = 56000;
 778         else if (baud <= 58053)    baud = 57600;
 779         else if (baud <= 64111)    baud = 64000;
 780         else if (baud <= 77608)    baud = 76800;
 781         else if (baud <= 117028)   baud = 115200;
 782         else if (baud <= 129347)   baud = 128000;
 783         else if (baud <= 156868)   baud = 153600;
 784         else if (baud <= 237832)   baud = 230400;
 785         else if (baud <= 254234)   baud = 250000;
 786         else if (baud <= 273066)   baud = 256000;
 787         else if (baud <= 491520)   baud = 460800;
 788         else if (baud <= 567138)   baud = 500000;
 789         else if (baud <= 670254)   baud = 576000;
 790         else if (baud < 1000000)
 791                 baud = 921600;
 792         else if (baud > 2000000)
 793                 baud = 2000000;
 794         return baud;
 795 }
 796
 797 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 798 {
 799         int result;
 800
 801         result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
 802         if (result) {
 803                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
 804                 return result;
 805         }
 806
 807         /* Configure the termios structure */
 808         cp210x_get_termios(tty, port);
 809
 810         /* The baud rate must be initialised on cp2104 */
 811         if (tty)
 812                 cp210x_change_speed(tty, port, NULL);
 813
 814         return usb_serial_generic_open(tty, port);
 815 }
 816
 817 static void cp210x_close(struct usb_serial_port *port)
 818 {
 819         usb_serial_generic_close(port);
 820
 821         /* Clear both queues; cp2108 needs this to avoid an occasional hang */
 822         cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
 823
 824         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 825 }
 826
 827 /*
 828  * Read how many bytes are waiting in the TX queue.
 829  */
 830 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
 831                 u32 *count)
 832 {
 833         struct usb_serial *serial = port->serial;
 834         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 835         struct cp210x_comm_status *sts;
 836         int result;
 837
 838         sts = kmalloc(sizeof(*sts), GFP_KERNEL);
 839         if (!sts)
 840                 return -ENOMEM;
 841
 842         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 843                         CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
 844                         0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
 845                         USB_CTRL_GET_TIMEOUT);
 846         if (result == sizeof(*sts)) {
 847                 *count = le32_to_cpu(sts->ulAmountInOutQueue);
 848                 result = 0;
 849         } else {
 850                 dev_err(&port->dev, "failed to get comm status: %d\n", result);
 851                 if (result >= 0)
 852                         result = -EIO;
 853         }
 854
 855         kfree(sts);
 856
 857         return result;
 858 }
 859
 860 static bool cp210x_tx_empty(struct usb_serial_port *port)
 861 {
 862         int err;
 863         u32 count;
 864
 865         err = cp210x_get_tx_queue_byte_count(port, &count);
 866         if (err)
 867                 return true;
 868
 869         return !count;
 870 }
 871
 872 /*
 873  * cp210x_get_termios
 874  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 875  * from the device, corrects any unsupported values, and configures the
 876  * termios structure to reflect the state of the device
 877  */
 878 static void cp210x_get_termios(struct tty_struct *tty,
 879         struct usb_serial_port *port)
 880 {
 881         unsigned int baud;
 882
 883         if (tty) {
 884                 cp210x_get_termios_port(tty->driver_data,
 885                         &tty->termios.c_cflag, &baud);
 886                 tty_encode_baud_rate(tty, baud, baud);
 887         } else {
 888                 tcflag_t cflag;
 889                 cflag = 0;
 890                 cp210x_get_termios_port(port, &cflag, &baud);
 891         }
 892 }
 893
 894 /*
 895  * cp210x_get_termios_port
 896  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
 897  */
 898 static void cp210x_get_termios_port(struct usb_serial_port *port,
 899         tcflag_t *cflagp, unsigned int *baudp)
 900 {
 901         struct device *dev = &port->dev;
 902         tcflag_t cflag;
 903         struct cp210x_flow_ctl flow_ctl;
 904         u32 baud;
 905         u16 bits;
 906         u32 ctl_hs;
 907
 908         cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
 909
 910         dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
 911         *baudp = baud;
 912
 913         cflag = *cflagp;
 914
 915         cp210x_get_line_ctl(port, &bits);
 916         cflag &= ~CSIZE;
 917         switch (bits & BITS_DATA_MASK) {
 918         case BITS_DATA_5:
 919                 dev_dbg(dev, "%s - data bits = 5\n", __func__);
 920                 cflag |= CS5;
 921                 break;
 922         case BITS_DATA_6:
 923                 dev_dbg(dev, "%s - data bits = 6\n", __func__);
 924                 cflag |= CS6;
 925                 break;
 926         case BITS_DATA_7:
 927                 dev_dbg(dev, "%s - data bits = 7\n", __func__);
 928                 cflag |= CS7;
 929                 break;
 930         case BITS_DATA_8:
 931                 dev_dbg(dev, "%s - data bits = 8\n", __func__);
 932                 cflag |= CS8;
 933                 break;
 934         case BITS_DATA_9:
 935                 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\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         default:
 942                 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
 943                 cflag |= CS8;
 944                 bits &= ~BITS_DATA_MASK;
 945                 bits |= BITS_DATA_8;
 946                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 947                 break;
 948         }
 949
 950         switch (bits & BITS_PARITY_MASK) {
 951         case BITS_PARITY_NONE:
 952                 dev_dbg(dev, "%s - parity = NONE\n", __func__);
 953                 cflag &= ~PARENB;
 954                 break;
 955         case BITS_PARITY_ODD:
 956                 dev_dbg(dev, "%s - parity = ODD\n", __func__);
 957                 cflag |= (PARENB|PARODD);
 958                 break;
 959         case BITS_PARITY_EVEN:
 960                 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
 961                 cflag &= ~PARODD;
 962                 cflag |= PARENB;
 963                 break;
 964         case BITS_PARITY_MARK:
 965                 dev_dbg(dev, "%s - parity = MARK\n", __func__);
 966                 cflag |= (PARENB|PARODD|CMSPAR);
 967                 break;
 968         case BITS_PARITY_SPACE:
 969                 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
 970                 cflag &= ~PARODD;
 971                 cflag |= (PARENB|CMSPAR);
 972                 break;
 973         default:
 974                 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
 975                 cflag &= ~PARENB;
 976                 bits &= ~BITS_PARITY_MASK;
 977                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 978                 break;
 979         }
 980
 981         cflag &= ~CSTOPB;
 982         switch (bits & BITS_STOP_MASK) {
 983         case BITS_STOP_1:
 984                 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
 985                 break;
 986         case BITS_STOP_1_5:
 987                 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
 988                 bits &= ~BITS_STOP_MASK;
 989                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 990                 break;
 991         case BITS_STOP_2:
 992                 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
 993                 cflag |= CSTOPB;
 994                 break;
 995         default:
 996                 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
 997                 bits &= ~BITS_STOP_MASK;
 998                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 999                 break;
1000         }
1001
1002         cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1003                         sizeof(flow_ctl));
1004         ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1005         if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
1006                 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1007                 cflag |= CRTSCTS;
1008         } else {
1009                 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1010                 cflag &= ~CRTSCTS;
1011         }
1012
1013         *cflagp = cflag;
1014 }
1015
1016 /*
1017  * CP2101 supports the following baud rates:
1018  *
1019  *      300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1020  *      38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1021  *
1022  * CP2102 and CP2103 support the following additional rates:
1023  *
1024  *      4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1025  *      576000
1026  *
1027  * The device will map a requested rate to a supported one, but the result
1028  * of requests for rates greater than 1053257 is undefined (see AN205).
1029  *
1030  * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1031  * respectively, with an error less than 1%. The actual rates are determined
1032  * by
1033  *
1034  *      div = round(freq / (2 x prescale x request))
1035  *      actual = freq / (2 x prescale x div)
1036  *
1037  * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1038  * or 1 otherwise.
1039  * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1040  * otherwise.
1041  */
1042 static void cp210x_change_speed(struct tty_struct *tty,
1043                 struct usb_serial_port *port, struct ktermios *old_termios)
1044 {
1045         u32 baud;
1046
1047         baud = tty->termios.c_ospeed;
1048
1049         /* This maps the requested rate to a rate valid on cp2102 or cp2103,
1050          * or to an arbitrary rate in [1M,2M].
1051          *
1052          * NOTE: B0 is not implemented.
1053          */
1054         baud = cp210x_quantise_baudrate(baud);
1055
1056         dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1057         if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1058                 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1059                 if (old_termios)
1060                         baud = old_termios->c_ospeed;
1061                 else
1062                         baud = 9600;
1063         }
1064
1065         tty_encode_baud_rate(tty, baud, baud);
1066 }
1067
1068 static void cp210x_set_termios(struct tty_struct *tty,
1069                 struct usb_serial_port *port, struct ktermios *old_termios)
1070 {
1071         struct device *dev = &port->dev;
1072         unsigned int cflag, old_cflag;
1073         u16 bits;
1074
1075         cflag = tty->termios.c_cflag;
1076         old_cflag = old_termios->c_cflag;
1077
1078         if (tty->termios.c_ospeed != old_termios->c_ospeed)
1079                 cp210x_change_speed(tty, port, old_termios);
1080
1081         /* If the number of data bits is to be updated */
1082         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
1083                 cp210x_get_line_ctl(port, &bits);
1084                 bits &= ~BITS_DATA_MASK;
1085                 switch (cflag & CSIZE) {
1086                 case CS5:
1087                         bits |= BITS_DATA_5;
1088                         dev_dbg(dev, "%s - data bits = 5\n", __func__);
1089                         break;
1090                 case CS6:
1091                         bits |= BITS_DATA_6;
1092                         dev_dbg(dev, "%s - data bits = 6\n", __func__);
1093                         break;
1094                 case CS7:
1095                         bits |= BITS_DATA_7;
1096                         dev_dbg(dev, "%s - data bits = 7\n", __func__);
1097                         break;
1098                 case CS8:
1099                 default:
1100                         bits |= BITS_DATA_8;
1101                         dev_dbg(dev, "%s - data bits = 8\n", __func__);
1102                         break;
1103                 }
1104                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1105                         dev_dbg(dev, "Number of data bits requested not supported by device\n");
1106         }
1107
1108         if ((cflag     & (PARENB|PARODD|CMSPAR)) !=
1109             (old_cflag & (PARENB|PARODD|CMSPAR))) {
1110                 cp210x_get_line_ctl(port, &bits);
1111                 bits &= ~BITS_PARITY_MASK;
1112                 if (cflag & PARENB) {
1113                         if (cflag & CMSPAR) {
1114                                 if (cflag & PARODD) {
1115                                         bits |= BITS_PARITY_MARK;
1116                                         dev_dbg(dev, "%s - parity = MARK\n", __func__);
1117                                 } else {
1118                                         bits |= BITS_PARITY_SPACE;
1119                                         dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1120                                 }
1121                         } else {
1122                                 if (cflag & PARODD) {
1123                                         bits |= BITS_PARITY_ODD;
1124                                         dev_dbg(dev, "%s - parity = ODD\n", __func__);
1125                                 } else {
1126                                         bits |= BITS_PARITY_EVEN;
1127                                         dev_dbg(dev, "%s - parity = EVEN\n", __func__);
1128                                 }
1129                         }
1130                 }
1131                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1132                         dev_dbg(dev, "Parity mode not supported by device\n");
1133         }
1134
1135         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
1136                 cp210x_get_line_ctl(port, &bits);
1137                 bits &= ~BITS_STOP_MASK;
1138                 if (cflag & CSTOPB) {
1139                         bits |= BITS_STOP_2;
1140                         dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1141                 } else {
1142                         bits |= BITS_STOP_1;
1143                         dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1144                 }
1145                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1146                         dev_dbg(dev, "Number of stop bits requested not supported by device\n");
1147         }
1148
1149         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
1150                 struct cp210x_flow_ctl flow_ctl;
1151                 u32 ctl_hs;
1152                 u32 flow_repl;
1153
1154                 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1155                                 sizeof(flow_ctl));
1156                 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1157                 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1158                 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1159                                 __func__, ctl_hs, flow_repl);
1160
1161                 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1162                 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1163                 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1164                 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1165                 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1166                 if (cflag & CRTSCTS) {
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_FLOW_CTL);
1172                         dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1173                 } else {
1174                         ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1175
1176                         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1177                         flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1178                                         CP210X_SERIAL_RTS_ACTIVE);
1179                         dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1180                 }
1181
1182                 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1183                                 __func__, ctl_hs, flow_repl);
1184                 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1185                 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1186                 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1187                                 sizeof(flow_ctl));
1188         }
1189
1190 }
1191
1192 static int cp210x_tiocmset(struct tty_struct *tty,
1193                 unsigned int set, unsigned int clear)
1194 {
1195         struct usb_serial_port *port = tty->driver_data;
1196         return cp210x_tiocmset_port(port, set, clear);
1197 }
1198
1199 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1200                 unsigned int set, unsigned int clear)
1201 {
1202         u16 control = 0;
1203
1204         if (set & TIOCM_RTS) {
1205                 control |= CONTROL_RTS;
1206                 control |= CONTROL_WRITE_RTS;
1207         }
1208         if (set & TIOCM_DTR) {
1209                 control |= CONTROL_DTR;
1210                 control |= CONTROL_WRITE_DTR;
1211         }
1212         if (clear & TIOCM_RTS) {
1213                 control &= ~CONTROL_RTS;
1214                 control |= CONTROL_WRITE_RTS;
1215         }
1216         if (clear & TIOCM_DTR) {
1217                 control &= ~CONTROL_DTR;
1218                 control |= CONTROL_WRITE_DTR;
1219         }
1220
1221         dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1222
1223         return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1224 }
1225
1226 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1227 {
1228         if (on)
1229                 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1230         else
1231                 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1232 }
1233
1234 static int cp210x_tiocmget(struct tty_struct *tty)
1235 {
1236         struct usb_serial_port *port = tty->driver_data;
1237         u8 control;
1238         int result;
1239
1240         result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1241         if (result)
1242                 return result;
1243
1244         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1245                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1246                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1247                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1248                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
1249                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
1250
1251         dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1252
1253         return result;
1254 }
1255
1256 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1257 {
1258         struct usb_serial_port *port = tty->driver_data;
1259         u16 state;
1260
1261         if (break_state == 0)
1262                 state = BREAK_OFF;
1263         else
1264                 state = BREAK_ON;
1265         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1266                 state == BREAK_OFF ? "off" : "on");
1267         cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1268 }
1269
1270 #ifdef CONFIG_GPIOLIB
1271 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset)
1272 {
1273         struct usb_serial *serial = gpiochip_get_data(gc);
1274         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1275
1276         switch (offset) {
1277         case 0:
1278                 if (priv->config & CP2105_GPIO0_TXLED_MODE)
1279                         return -ENODEV;
1280                 break;
1281         case 1:
1282                 if (priv->config & (CP2105_GPIO1_RXLED_MODE |
1283                                     CP2105_GPIO1_RS485_MODE))
1284                         return -ENODEV;
1285                 break;
1286         }
1287
1288         return 0;
1289 }
1290
1291 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1292 {
1293         struct usb_serial *serial = gpiochip_get_data(gc);
1294         int result;
1295         u8 buf;
1296
1297         result = cp210x_read_vendor_block(serial, REQTYPE_INTERFACE_TO_HOST,
1298                                           CP210X_READ_LATCH, &buf, sizeof(buf));
1299         if (result < 0)
1300                 return result;
1301
1302         return !!(buf & BIT(gpio));
1303 }
1304
1305 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1306 {
1307         struct usb_serial *serial = gpiochip_get_data(gc);
1308         struct cp210x_gpio_write buf;
1309
1310         if (value == 1)
1311                 buf.state = BIT(gpio);
1312         else
1313                 buf.state = 0;
1314
1315         buf.mask = BIT(gpio);
1316
1317         cp210x_write_vendor_block(serial, REQTYPE_HOST_TO_INTERFACE,
1318                                   CP210X_WRITE_LATCH, &buf, sizeof(buf));
1319 }
1320
1321 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1322 {
1323         /* Hardware does not support an input mode */
1324         return 0;
1325 }
1326
1327 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1328 {
1329         /* Hardware does not support an input mode */
1330         return -ENOTSUPP;
1331 }
1332
1333 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1334                                         int value)
1335 {
1336         return 0;
1337 }
1338
1339 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1340                                   unsigned long config)
1341 {
1342         struct usb_serial *serial = gpiochip_get_data(gc);
1343         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1344         enum pin_config_param param = pinconf_to_config_param(config);
1345
1346         /* Succeed only if in correct mode (this can't be set at runtime) */
1347         if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1348             (priv->gpio_mode & BIT(gpio)))
1349                 return 0;
1350
1351         if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1352             !(priv->gpio_mode & BIT(gpio)))
1353                 return 0;
1354
1355         return -ENOTSUPP;
1356 }
1357
1358 /*
1359  * This function is for configuring GPIO using shared pins, where other signals
1360  * are made unavailable by configuring the use of GPIO. This is believed to be
1361  * only applicable to the cp2105 at this point, the other devices supported by
1362  * this driver that provide GPIO do so in a way that does not impact other
1363  * signals and are thus expected to have very different initialisation.
1364  */
1365 static int cp2105_shared_gpio_init(struct usb_serial *serial)
1366 {
1367         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1368         struct cp210x_pin_mode mode;
1369         struct cp210x_config config;
1370         u8 intf_num = cp210x_interface_num(serial);
1371         int result;
1372
1373         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1374                                           CP210X_GET_DEVICEMODE, &mode,
1375                                           sizeof(mode));
1376         if (result < 0)
1377                 return result;
1378
1379         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1380                                           CP210X_GET_PORTCONFIG, &config,
1381                                           sizeof(config));
1382         if (result < 0)
1383                 return result;
1384
1385         /*  2 banks of GPIO - One for the pins taken from each serial port */
1386         if (intf_num == 0) {
1387                 if (mode.eci == CP210X_PIN_MODE_MODEM)
1388                         return 0;
1389
1390                 priv->config = config.eci_cfg;
1391                 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
1392                                                 CP210X_ECI_GPIO_MODE_MASK) >>
1393                                                 CP210X_ECI_GPIO_MODE_OFFSET);
1394                 priv->gc.ngpio = 2;
1395         } else if (intf_num == 1) {
1396                 if (mode.sci == CP210X_PIN_MODE_MODEM)
1397                         return 0;
1398
1399                 priv->config = config.sci_cfg;
1400                 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
1401                                                 CP210X_SCI_GPIO_MODE_MASK) >>
1402                                                 CP210X_SCI_GPIO_MODE_OFFSET);
1403                 priv->gc.ngpio = 3;
1404         } else {
1405                 return -ENODEV;
1406         }
1407
1408         priv->gc.label = "cp210x";
1409         priv->gc.request = cp210x_gpio_request;
1410         priv->gc.get_direction = cp210x_gpio_direction_get;
1411         priv->gc.direction_input = cp210x_gpio_direction_input;
1412         priv->gc.direction_output = cp210x_gpio_direction_output;
1413         priv->gc.get = cp210x_gpio_get;
1414         priv->gc.set = cp210x_gpio_set;
1415         priv->gc.set_config = cp210x_gpio_set_config;
1416         priv->gc.owner = THIS_MODULE;
1417         priv->gc.parent = &serial->interface->dev;
1418         priv->gc.base = -1;
1419         priv->gc.can_sleep = true;
1420
1421         result = gpiochip_add_data(&priv->gc, serial);
1422         if (!result)
1423                 priv->gpio_registered = true;
1424
1425         return result;
1426 }
1427
1428 static void cp210x_gpio_remove(struct usb_serial *serial)
1429 {
1430         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1431
1432         if (priv->gpio_registered) {
1433                 gpiochip_remove(&priv->gc);
1434                 priv->gpio_registered = false;
1435         }
1436 }
1437
1438 #else
1439
1440 static int cp2105_shared_gpio_init(struct usb_serial *serial)
1441 {
1442         return 0;
1443 }
1444
1445 static void cp210x_gpio_remove(struct usb_serial *serial)
1446 {
1447         /* Nothing to do */
1448 }
1449
1450 #endif
1451
1452 static int cp210x_port_probe(struct usb_serial_port *port)
1453 {
1454         struct usb_serial *serial = port->serial;
1455         struct cp210x_port_private *port_priv;
1456         int ret;
1457
1458         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1459         if (!port_priv)
1460                 return -ENOMEM;
1461
1462         port_priv->bInterfaceNumber = cp210x_interface_num(serial);
1463
1464         usb_set_serial_port_data(port, port_priv);
1465
1466         ret = cp210x_detect_swapped_line_ctl(port);
1467         if (ret) {
1468                 kfree(port_priv);
1469                 return ret;
1470         }
1471
1472         return 0;
1473 }
1474
1475 static int cp210x_port_remove(struct usb_serial_port *port)
1476 {
1477         struct cp210x_port_private *port_priv;
1478
1479         port_priv = usb_get_serial_port_data(port);
1480         kfree(port_priv);
1481
1482         return 0;
1483 }
1484
1485 static int cp210x_attach(struct usb_serial *serial)
1486 {
1487         int result;
1488         struct cp210x_serial_private *priv;
1489
1490         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1491         if (!priv)
1492                 return -ENOMEM;
1493
1494         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1495                                           CP210X_GET_PARTNUM, &priv->partnum,
1496                                           sizeof(priv->partnum));
1497         if (result < 0) {
1498                 dev_warn(&serial->interface->dev,
1499                          "querying part number failed\n");
1500                 priv->partnum = CP210X_PARTNUM_UNKNOWN;
1501         }
1502
1503         usb_set_serial_data(serial, priv);
1504
1505         if (priv->partnum == CP210X_PARTNUM_CP2105) {
1506                 result = cp2105_shared_gpio_init(serial);
1507                 if (result < 0) {
1508                         dev_err(&serial->interface->dev,
1509                                 "GPIO initialisation failed, continuing without GPIO support\n");
1510                 }
1511         }
1512
1513         return 0;
1514 }
1515
1516 static void cp210x_disconnect(struct usb_serial *serial)
1517 {
1518         cp210x_gpio_remove(serial);
1519 }
1520
1521 static void cp210x_release(struct usb_serial *serial)
1522 {
1523         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1524
1525         cp210x_gpio_remove(serial);
1526
1527         kfree(priv);
1528 }
1529
1530 module_usb_serial_driver(serial_drivers, id_table);
1531
1532 MODULE_DESCRIPTION(DRIVER_DESC);
1533 MODULE_LICENSE("GPL v2");