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, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */
  99         { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */
 100         { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */
 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, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */
 119         { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */
 120         { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */
 121         { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
 122         { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
 123         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
 124         { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
 125         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
 126         { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
 127         { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
 128         { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
 129         { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
 130         { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
 131         { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
 132         { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
 133         { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */
 134         { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */
 135         { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */
 136         { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
 137         { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
 138         { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
 139         { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
 140         { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
 141         { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
 142         { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
 143         { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
 144         { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
 145         { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */
 146         { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */
 147         { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
 148         { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
 149         { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
 150         { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
 151         { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */
 152         { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */
 153         { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
 154         { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
 155         { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
 156         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 157         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 158         { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */
 159         { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
 160         { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
 161         { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */
 162         { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */
 163         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 164         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 165         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 166         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 167         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 168         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 169         { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
 170         { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
 171         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 172         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 173         { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */
 174         { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
 175         { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
 176         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 177         { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
 178         { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
 179         { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
 180         { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
 181         { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
 182         { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
 183         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 184         { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
 185         { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
 186         { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
 187         { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
 188         { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
 189         { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
 190         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
 191         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
 192         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 193         { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
 194         { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
 195         { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
 196         { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
 197         { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
 198         { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
 199         { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
 200         { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
 201         { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
 202         { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
 203         { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
 204         { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
 205         { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
 206         { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
 207         { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
 208         { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
 209         { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
 210         { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
 211         { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
 212         { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
 213         { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
 214         { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
 215         { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
 216         { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
 217         { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
 218         { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
 219         { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
 220         { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
 221         { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
 222         { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
 223         { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
 224         { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
 225         { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
 226         { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
 227         { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
 228         { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
 229         { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
 230         { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
 231         { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
 232         { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
 233         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 234         { } /* Terminating Entry */
 235 };
 236
 237 MODULE_DEVICE_TABLE(usb, id_table);
 238
 239 struct cp210x_serial_private {
 240 #ifdef CONFIG_GPIOLIB
 241         struct gpio_chip        gc;
 242         u8                      config;
 243         u8                      gpio_mode;
 244         bool                    gpio_registered;
 245 #endif
 246         u8                      partnum;
 247 };
 248
 249 struct cp210x_port_private {
 250         __u8                    bInterfaceNumber;
 251         bool                    has_swapped_line_ctl;
 252 };
 253
 254 static struct usb_serial_driver cp210x_device = {
 255         .driver = {
 256                 .owner =        THIS_MODULE,
 257                 .name =         "cp210x",
 258         },
 259         .id_table               = id_table,
 260         .num_ports              = 1,
 261         .bulk_in_size           = 256,
 262         .bulk_out_size          = 256,
 263         .open                   = cp210x_open,
 264         .close                  = cp210x_close,
 265         .break_ctl              = cp210x_break_ctl,
 266         .set_termios            = cp210x_set_termios,
 267         .tx_empty               = cp210x_tx_empty,
 268         .tiocmget               = cp210x_tiocmget,
 269         .tiocmset               = cp210x_tiocmset,
 270         .attach                 = cp210x_attach,
 271         .disconnect             = cp210x_disconnect,
 272         .release                = cp210x_release,
 273         .port_probe             = cp210x_port_probe,
 274         .port_remove            = cp210x_port_remove,
 275         .dtr_rts                = cp210x_dtr_rts
 276 };
 277
 278 static struct usb_serial_driver * const serial_drivers[] = {
 279         &cp210x_device, NULL
 280 };
 281
 282 /* Config request types */
 283 #define REQTYPE_HOST_TO_INTERFACE       0x41
 284 #define REQTYPE_INTERFACE_TO_HOST       0xc1
 285 #define REQTYPE_HOST_TO_DEVICE  0x40
 286 #define REQTYPE_DEVICE_TO_HOST  0xc0
 287
 288 /* Config request codes */
 289 #define CP210X_IFC_ENABLE       0x00
 290 #define CP210X_SET_BAUDDIV      0x01
 291 #define CP210X_GET_BAUDDIV      0x02
 292 #define CP210X_SET_LINE_CTL     0x03
 293 #define CP210X_GET_LINE_CTL     0x04
 294 #define CP210X_SET_BREAK        0x05
 295 #define CP210X_IMM_CHAR         0x06
 296 #define CP210X_SET_MHS          0x07
 297 #define CP210X_GET_MDMSTS       0x08
 298 #define CP210X_SET_XON          0x09
 299 #define CP210X_SET_XOFF         0x0A
 300 #define CP210X_SET_EVENTMASK    0x0B
 301 #define CP210X_GET_EVENTMASK    0x0C
 302 #define CP210X_SET_CHAR         0x0D
 303 #define CP210X_GET_CHARS        0x0E
 304 #define CP210X_GET_PROPS        0x0F
 305 #define CP210X_GET_COMM_STATUS  0x10
 306 #define CP210X_RESET            0x11
 307 #define CP210X_PURGE            0x12
 308 #define CP210X_SET_FLOW         0x13
 309 #define CP210X_GET_FLOW         0x14
 310 #define CP210X_EMBED_EVENTS     0x15
 311 #define CP210X_GET_EVENTSTATE   0x16
 312 #define CP210X_SET_CHARS        0x19
 313 #define CP210X_GET_BAUDRATE     0x1D
 314 #define CP210X_SET_BAUDRATE     0x1E
 315 #define CP210X_VENDOR_SPECIFIC  0xFF
 316
 317 /* CP210X_IFC_ENABLE */
 318 #define UART_ENABLE             0x0001
 319 #define UART_DISABLE            0x0000
 320
 321 /* CP210X_(SET|GET)_BAUDDIV */
 322 #define BAUD_RATE_GEN_FREQ      0x384000
 323
 324 /* CP210X_(SET|GET)_LINE_CTL */
 325 #define BITS_DATA_MASK          0X0f00
 326 #define BITS_DATA_5             0X0500
 327 #define BITS_DATA_6             0X0600
 328 #define BITS_DATA_7             0X0700
 329 #define BITS_DATA_8             0X0800
 330 #define BITS_DATA_9             0X0900
 331
 332 #define BITS_PARITY_MASK        0x00f0
 333 #define BITS_PARITY_NONE        0x0000
 334 #define BITS_PARITY_ODD         0x0010
 335 #define BITS_PARITY_EVEN        0x0020
 336 #define BITS_PARITY_MARK        0x0030
 337 #define BITS_PARITY_SPACE       0x0040
 338
 339 #define BITS_STOP_MASK          0x000f
 340 #define BITS_STOP_1             0x0000
 341 #define BITS_STOP_1_5           0x0001
 342 #define BITS_STOP_2             0x0002
 343
 344 /* CP210X_SET_BREAK */
 345 #define BREAK_ON                0x0001
 346 #define BREAK_OFF               0x0000
 347
 348 /* CP210X_(SET_MHS|GET_MDMSTS) */
 349 #define CONTROL_DTR             0x0001
 350 #define CONTROL_RTS             0x0002
 351 #define CONTROL_CTS             0x0010
 352 #define CONTROL_DSR             0x0020
 353 #define CONTROL_RING            0x0040
 354 #define CONTROL_DCD             0x0080
 355 #define CONTROL_WRITE_DTR       0x0100
 356 #define CONTROL_WRITE_RTS       0x0200
 357
 358 /* CP210X_VENDOR_SPECIFIC values */
 359 #define CP210X_READ_LATCH       0x00C2
 360 #define CP210X_GET_PARTNUM      0x370B
 361 #define CP210X_GET_PORTCONFIG   0x370C
 362 #define CP210X_GET_DEVICEMODE   0x3711
 363 #define CP210X_WRITE_LATCH      0x37E1
 364
 365 /* Part number definitions */
 366 #define CP210X_PARTNUM_CP2101   0x01
 367 #define CP210X_PARTNUM_CP2102   0x02
 368 #define CP210X_PARTNUM_CP2103   0x03
 369 #define CP210X_PARTNUM_CP2104   0x04
 370 #define CP210X_PARTNUM_CP2105   0x05
 371 #define CP210X_PARTNUM_CP2108   0x08
 372 #define CP210X_PARTNUM_UNKNOWN  0xFF
 373
 374 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
 375 struct cp210x_comm_status {
 376         __le32   ulErrors;
 377         __le32   ulHoldReasons;
 378         __le32   ulAmountInInQueue;
 379         __le32   ulAmountInOutQueue;
 380         u8       bEofReceived;
 381         u8       bWaitForImmediate;
 382         u8       bReserved;
 383 } __packed;
 384
 385 /*
 386  * CP210X_PURGE - 16 bits passed in wValue of USB request.
 387  * SiLabs app note AN571 gives a strange description of the 4 bits:
 388  * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
 389  * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
 390  */
 391 #define PURGE_ALL               0x000f
 392
 393 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
 394 struct cp210x_flow_ctl {
 395         __le32  ulControlHandshake;
 396         __le32  ulFlowReplace;
 397         __le32  ulXonLimit;
 398         __le32  ulXoffLimit;
 399 } __packed;
 400
 401 /* cp210x_flow_ctl::ulControlHandshake */
 402 #define CP210X_SERIAL_DTR_MASK          GENMASK(1, 0)
 403 #define CP210X_SERIAL_DTR_SHIFT(_mode)  (_mode)
 404 #define CP210X_SERIAL_CTS_HANDSHAKE     BIT(3)
 405 #define CP210X_SERIAL_DSR_HANDSHAKE     BIT(4)
 406 #define CP210X_SERIAL_DCD_HANDSHAKE     BIT(5)
 407 #define CP210X_SERIAL_DSR_SENSITIVITY   BIT(6)
 408
 409 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
 410 #define CP210X_SERIAL_DTR_INACTIVE      0
 411 #define CP210X_SERIAL_DTR_ACTIVE        1
 412 #define CP210X_SERIAL_DTR_FLOW_CTL      2
 413
 414 /* cp210x_flow_ctl::ulFlowReplace */
 415 #define CP210X_SERIAL_AUTO_TRANSMIT     BIT(0)
 416 #define CP210X_SERIAL_AUTO_RECEIVE      BIT(1)
 417 #define CP210X_SERIAL_ERROR_CHAR        BIT(2)
 418 #define CP210X_SERIAL_NULL_STRIPPING    BIT(3)
 419 #define CP210X_SERIAL_BREAK_CHAR        BIT(4)
 420 #define CP210X_SERIAL_RTS_MASK          GENMASK(7, 6)
 421 #define CP210X_SERIAL_RTS_SHIFT(_mode)  (_mode << 6)
 422 #define CP210X_SERIAL_XOFF_CONTINUE     BIT(31)
 423
 424 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
 425 #define CP210X_SERIAL_RTS_INACTIVE      0
 426 #define CP210X_SERIAL_RTS_ACTIVE        1
 427 #define CP210X_SERIAL_RTS_FLOW_CTL      2
 428
 429 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
 430 struct cp210x_pin_mode {
 431         u8      eci;
 432         u8      sci;
 433 } __packed;
 434
 435 #define CP210X_PIN_MODE_MODEM           0
 436 #define CP210X_PIN_MODE_GPIO            BIT(0)
 437
 438 /*
 439  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes.
 440  * Structure needs padding due to unused/unspecified bytes.
 441  */
 442 struct cp210x_config {
 443         __le16  gpio_mode;
 444         u8      __pad0[2];
 445         __le16  reset_state;
 446         u8      __pad1[4];
 447         __le16  suspend_state;
 448         u8      sci_cfg;
 449         u8      eci_cfg;
 450         u8      device_cfg;
 451 } __packed;
 452
 453 /* GPIO modes */
 454 #define CP210X_SCI_GPIO_MODE_OFFSET     9
 455 #define CP210X_SCI_GPIO_MODE_MASK       GENMASK(11, 9)
 456
 457 #define CP210X_ECI_GPIO_MODE_OFFSET     2
 458 #define CP210X_ECI_GPIO_MODE_MASK       GENMASK(3, 2)
 459
 460 /* CP2105 port configuration values */
 461 #define CP2105_GPIO0_TXLED_MODE         BIT(0)
 462 #define CP2105_GPIO1_RXLED_MODE         BIT(1)
 463 #define CP2105_GPIO1_RS485_MODE         BIT(2)
 464
 465 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
 466 struct cp210x_gpio_write {
 467         u8      mask;
 468         u8      state;
 469 } __packed;
 470
 471 /*
 472  * Helper to get interface number when we only have struct usb_serial.
 473  */
 474 static u8 cp210x_interface_num(struct usb_serial *serial)
 475 {
 476         struct usb_host_interface *cur_altsetting;
 477
 478         cur_altsetting = serial->interface->cur_altsetting;
 479
 480         return cur_altsetting->desc.bInterfaceNumber;
 481 }
 482
 483 /*
 484  * Reads a variable-sized block of CP210X_ registers, identified by req.
 485  * Returns data into buf in native USB byte order.
 486  */
 487 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
 488                 void *buf, int bufsize)
 489 {
 490         struct usb_serial *serial = port->serial;
 491         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 492         void *dmabuf;
 493         int result;
 494
 495         dmabuf = kmalloc(bufsize, GFP_KERNEL);
 496         if (!dmabuf) {
 497                 /*
 498                  * FIXME Some callers don't bother to check for error,
 499                  * at least give them consistent junk until they are fixed
 500                  */
 501                 memset(buf, 0, bufsize);
 502                 return -ENOMEM;
 503         }
 504
 505         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 506                         req, REQTYPE_INTERFACE_TO_HOST, 0,
 507                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 508                         USB_CTRL_SET_TIMEOUT);
 509         if (result == bufsize) {
 510                 memcpy(buf, dmabuf, bufsize);
 511                 result = 0;
 512         } else {
 513                 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
 514                                 req, bufsize, result);
 515                 if (result >= 0)
 516                         result = -EIO;
 517
 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                 memset(buf, 0, bufsize);
 523         }
 524
 525         kfree(dmabuf);
 526
 527         return result;
 528 }
 529
 530 /*
 531  * Reads any 32-bit CP210X_ register identified by req.
 532  */
 533 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
 534 {
 535         __le32 le32_val;
 536         int err;
 537
 538         err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
 539         if (err) {
 540                 /*
 541                  * FIXME Some callers don't bother to check for error,
 542                  * at least give them consistent junk until they are fixed
 543                  */
 544                 *val = 0;
 545                 return err;
 546         }
 547
 548         *val = le32_to_cpu(le32_val);
 549
 550         return 0;
 551 }
 552
 553 /*
 554  * Reads any 16-bit CP210X_ register identified by req.
 555  */
 556 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
 557 {
 558         __le16 le16_val;
 559         int err;
 560
 561         err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
 562         if (err)
 563                 return err;
 564
 565         *val = le16_to_cpu(le16_val);
 566
 567         return 0;
 568 }
 569
 570 /*
 571  * Reads any 8-bit CP210X_ register identified by req.
 572  */
 573 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
 574 {
 575         return cp210x_read_reg_block(port, req, val, sizeof(*val));
 576 }
 577
 578 /*
 579  * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
 580  * Returns data into buf in native USB byte order.
 581  */
 582 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
 583                                     void *buf, int bufsize)
 584 {
 585         void *dmabuf;
 586         int result;
 587
 588         dmabuf = kmalloc(bufsize, GFP_KERNEL);
 589         if (!dmabuf)
 590                 return -ENOMEM;
 591
 592         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 593                                  CP210X_VENDOR_SPECIFIC, type, val,
 594                                  cp210x_interface_num(serial), dmabuf, bufsize,
 595                                  USB_CTRL_GET_TIMEOUT);
 596         if (result == bufsize) {
 597                 memcpy(buf, dmabuf, bufsize);
 598                 result = 0;
 599         } else {
 600                 dev_err(&serial->interface->dev,
 601                         "failed to get vendor val 0x%04x size %d: %d\n", val,
 602                         bufsize, result);
 603                 if (result >= 0)
 604                         result = -EIO;
 605         }
 606
 607         kfree(dmabuf);
 608
 609         return result;
 610 }
 611
 612 /*
 613  * Writes any 16-bit CP210X_ register (req) whose value is passed
 614  * entirely in the wValue field of the USB request.
 615  */
 616 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
 617 {
 618         struct usb_serial *serial = port->serial;
 619         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 620         int result;
 621
 622         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 623                         req, REQTYPE_HOST_TO_INTERFACE, val,
 624                         port_priv->bInterfaceNumber, NULL, 0,
 625                         USB_CTRL_SET_TIMEOUT);
 626         if (result < 0) {
 627                 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
 628                                 req, result);
 629         }
 630
 631         return result;
 632 }
 633
 634 /*
 635  * Writes a variable-sized block of CP210X_ registers, identified by req.
 636  * Data in buf must be in native USB byte order.
 637  */
 638 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
 639                 void *buf, int bufsize)
 640 {
 641         struct usb_serial *serial = port->serial;
 642         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 643         void *dmabuf;
 644         int result;
 645
 646         dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
 647         if (!dmabuf)
 648                 return -ENOMEM;
 649
 650         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 651                         req, REQTYPE_HOST_TO_INTERFACE, 0,
 652                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 653                         USB_CTRL_SET_TIMEOUT);
 654
 655         kfree(dmabuf);
 656
 657         if (result == bufsize) {
 658                 result = 0;
 659         } else {
 660                 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
 661                                 req, bufsize, result);
 662                 if (result >= 0)
 663                         result = -EIO;
 664         }
 665
 666         return result;
 667 }
 668
 669 /*
 670  * Writes any 32-bit CP210X_ register identified by req.
 671  */
 672 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
 673 {
 674         __le32 le32_val;
 675
 676         le32_val = cpu_to_le32(val);
 677
 678         return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
 679 }
 680
 681 #ifdef CONFIG_GPIOLIB
 682 /*
 683  * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
 684  * Data in buf must be in native USB byte order.
 685  */
 686 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
 687                                      u16 val, void *buf, int bufsize)
 688 {
 689         void *dmabuf;
 690         int result;
 691
 692         dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
 693         if (!dmabuf)
 694                 return -ENOMEM;
 695
 696         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 697                                  CP210X_VENDOR_SPECIFIC, type, val,
 698                                  cp210x_interface_num(serial), dmabuf, bufsize,
 699                                  USB_CTRL_SET_TIMEOUT);
 700
 701         kfree(dmabuf);
 702
 703         if (result == bufsize) {
 704                 result = 0;
 705         } else {
 706                 dev_err(&serial->interface->dev,
 707                         "failed to set vendor val 0x%04x size %d: %d\n", val,
 708                         bufsize, result);
 709                 if (result >= 0)
 710                         result = -EIO;
 711         }
 712
 713         return result;
 714 }
 715 #endif
 716
 717 /*
 718  * Detect CP2108 GET_LINE_CTL bug and activate workaround.
 719  * Write a known good value 0x800, read it back.
 720  * If it comes back swapped the bug is detected.
 721  * Preserve the original register value.
 722  */
 723 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
 724 {
 725         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 726         u16 line_ctl_save;
 727         u16 line_ctl_test;
 728         int err;
 729
 730         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
 731         if (err)
 732                 return err;
 733
 734         err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
 735         if (err)
 736                 return err;
 737
 738         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
 739         if (err)
 740                 return err;
 741
 742         if (line_ctl_test == 8) {
 743                 port_priv->has_swapped_line_ctl = true;
 744                 line_ctl_save = swab16(line_ctl_save);
 745         }
 746
 747         return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
 748 }
 749
 750 /*
 751  * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
 752  * to workaround cp2108 bug and get correct value.
 753  */
 754 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
 755 {
 756         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 757         int err;
 758
 759         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
 760         if (err)
 761                 return err;
 762
 763         /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
 764         if (port_priv->has_swapped_line_ctl)
 765                 *ctl = swab16(*ctl);
 766
 767         return 0;
 768 }
 769
 770 /*
 771  * cp210x_quantise_baudrate
 772  * Quantises the baud rate as per AN205 Table 1
 773  */
 774 static unsigned int cp210x_quantise_baudrate(unsigned int baud)
 775 {
 776         if (baud <= 300)
 777                 baud = 300;
 778         else if (baud <= 600)      baud = 600;
 779         else if (baud <= 1200)     baud = 1200;
 780         else if (baud <= 1800)     baud = 1800;
 781         else if (baud <= 2400)     baud = 2400;
 782         else if (baud <= 4000)     baud = 4000;
 783         else if (baud <= 4803)     baud = 4800;
 784         else if (baud <= 7207)     baud = 7200;
 785         else if (baud <= 9612)     baud = 9600;
 786         else if (baud <= 14428)    baud = 14400;
 787         else if (baud <= 16062)    baud = 16000;
 788         else if (baud <= 19250)    baud = 19200;
 789         else if (baud <= 28912)    baud = 28800;
 790         else if (baud <= 38601)    baud = 38400;
 791         else if (baud <= 51558)    baud = 51200;
 792         else if (baud <= 56280)    baud = 56000;
 793         else if (baud <= 58053)    baud = 57600;
 794         else if (baud <= 64111)    baud = 64000;
 795         else if (baud <= 77608)    baud = 76800;
 796         else if (baud <= 117028)   baud = 115200;
 797         else if (baud <= 129347)   baud = 128000;
 798         else if (baud <= 156868)   baud = 153600;
 799         else if (baud <= 237832)   baud = 230400;
 800         else if (baud <= 254234)   baud = 250000;
 801         else if (baud <= 273066)   baud = 256000;
 802         else if (baud <= 491520)   baud = 460800;
 803         else if (baud <= 567138)   baud = 500000;
 804         else if (baud <= 670254)   baud = 576000;
 805         else if (baud < 1000000)
 806                 baud = 921600;
 807         else if (baud > 2000000)
 808                 baud = 2000000;
 809         return baud;
 810 }
 811
 812 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 813 {
 814         int result;
 815
 816         result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
 817         if (result) {
 818                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
 819                 return result;
 820         }
 821
 822         /* Configure the termios structure */
 823         cp210x_get_termios(tty, port);
 824
 825         /* The baud rate must be initialised on cp2104 */
 826         if (tty)
 827                 cp210x_change_speed(tty, port, NULL);
 828
 829         return usb_serial_generic_open(tty, port);
 830 }
 831
 832 static void cp210x_close(struct usb_serial_port *port)
 833 {
 834         usb_serial_generic_close(port);
 835
 836         /* Clear both queues; cp2108 needs this to avoid an occasional hang */
 837         cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
 838
 839         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 840 }
 841
 842 /*
 843  * Read how many bytes are waiting in the TX queue.
 844  */
 845 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
 846                 u32 *count)
 847 {
 848         struct usb_serial *serial = port->serial;
 849         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 850         struct cp210x_comm_status *sts;
 851         int result;
 852
 853         sts = kmalloc(sizeof(*sts), GFP_KERNEL);
 854         if (!sts)
 855                 return -ENOMEM;
 856
 857         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 858                         CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
 859                         0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
 860                         USB_CTRL_GET_TIMEOUT);
 861         if (result == sizeof(*sts)) {
 862                 *count = le32_to_cpu(sts->ulAmountInOutQueue);
 863                 result = 0;
 864         } else {
 865                 dev_err(&port->dev, "failed to get comm status: %d\n", result);
 866                 if (result >= 0)
 867                         result = -EIO;
 868         }
 869
 870         kfree(sts);
 871
 872         return result;
 873 }
 874
 875 static bool cp210x_tx_empty(struct usb_serial_port *port)
 876 {
 877         int err;
 878         u32 count;
 879
 880         err = cp210x_get_tx_queue_byte_count(port, &count);
 881         if (err)
 882                 return true;
 883
 884         return !count;
 885 }
 886
 887 /*
 888  * cp210x_get_termios
 889  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 890  * from the device, corrects any unsupported values, and configures the
 891  * termios structure to reflect the state of the device
 892  */
 893 static void cp210x_get_termios(struct tty_struct *tty,
 894         struct usb_serial_port *port)
 895 {
 896         unsigned int baud;
 897
 898         if (tty) {
 899                 cp210x_get_termios_port(tty->driver_data,
 900                         &tty->termios.c_cflag, &baud);
 901                 tty_encode_baud_rate(tty, baud, baud);
 902         } else {
 903                 tcflag_t cflag;
 904                 cflag = 0;
 905                 cp210x_get_termios_port(port, &cflag, &baud);
 906         }
 907 }
 908
 909 /*
 910  * cp210x_get_termios_port
 911  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
 912  */
 913 static void cp210x_get_termios_port(struct usb_serial_port *port,
 914         tcflag_t *cflagp, unsigned int *baudp)
 915 {
 916         struct device *dev = &port->dev;
 917         tcflag_t cflag;
 918         struct cp210x_flow_ctl flow_ctl;
 919         u32 baud;
 920         u16 bits;
 921         u32 ctl_hs;
 922
 923         cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
 924
 925         dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
 926         *baudp = baud;
 927
 928         cflag = *cflagp;
 929
 930         cp210x_get_line_ctl(port, &bits);
 931         cflag &= ~CSIZE;
 932         switch (bits & BITS_DATA_MASK) {
 933         case BITS_DATA_5:
 934                 dev_dbg(dev, "%s - data bits = 5\n", __func__);
 935                 cflag |= CS5;
 936                 break;
 937         case BITS_DATA_6:
 938                 dev_dbg(dev, "%s - data bits = 6\n", __func__);
 939                 cflag |= CS6;
 940                 break;
 941         case BITS_DATA_7:
 942                 dev_dbg(dev, "%s - data bits = 7\n", __func__);
 943                 cflag |= CS7;
 944                 break;
 945         case BITS_DATA_8:
 946                 dev_dbg(dev, "%s - data bits = 8\n", __func__);
 947                 cflag |= CS8;
 948                 break;
 949         case BITS_DATA_9:
 950                 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
 951                 cflag |= CS8;
 952                 bits &= ~BITS_DATA_MASK;
 953                 bits |= BITS_DATA_8;
 954                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 955                 break;
 956         default:
 957                 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
 958                 cflag |= CS8;
 959                 bits &= ~BITS_DATA_MASK;
 960                 bits |= BITS_DATA_8;
 961                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 962                 break;
 963         }
 964
 965         switch (bits & BITS_PARITY_MASK) {
 966         case BITS_PARITY_NONE:
 967                 dev_dbg(dev, "%s - parity = NONE\n", __func__);
 968                 cflag &= ~PARENB;
 969                 break;
 970         case BITS_PARITY_ODD:
 971                 dev_dbg(dev, "%s - parity = ODD\n", __func__);
 972                 cflag |= (PARENB|PARODD);
 973                 break;
 974         case BITS_PARITY_EVEN:
 975                 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
 976                 cflag &= ~PARODD;
 977                 cflag |= PARENB;
 978                 break;
 979         case BITS_PARITY_MARK:
 980                 dev_dbg(dev, "%s - parity = MARK\n", __func__);
 981                 cflag |= (PARENB|PARODD|CMSPAR);
 982                 break;
 983         case BITS_PARITY_SPACE:
 984                 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
 985                 cflag &= ~PARODD;
 986                 cflag |= (PARENB|CMSPAR);
 987                 break;
 988         default:
 989                 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
 990                 cflag &= ~PARENB;
 991                 bits &= ~BITS_PARITY_MASK;
 992                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 993                 break;
 994         }
 995
 996         cflag &= ~CSTOPB;
 997         switch (bits & BITS_STOP_MASK) {
 998         case BITS_STOP_1:
 999                 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1000                 break;
1001         case BITS_STOP_1_5:
1002                 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
1003                 bits &= ~BITS_STOP_MASK;
1004                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1005                 break;
1006         case BITS_STOP_2:
1007                 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1008                 cflag |= CSTOPB;
1009                 break;
1010         default:
1011                 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
1012                 bits &= ~BITS_STOP_MASK;
1013                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1014                 break;
1015         }
1016
1017         cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1018                         sizeof(flow_ctl));
1019         ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1020         if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
1021                 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1022                 cflag |= CRTSCTS;
1023         } else {
1024                 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1025                 cflag &= ~CRTSCTS;
1026         }
1027
1028         *cflagp = cflag;
1029 }
1030
1031 /*
1032  * CP2101 supports the following baud rates:
1033  *
1034  *      300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1035  *      38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1036  *
1037  * CP2102 and CP2103 support the following additional rates:
1038  *
1039  *      4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1040  *      576000
1041  *
1042  * The device will map a requested rate to a supported one, but the result
1043  * of requests for rates greater than 1053257 is undefined (see AN205).
1044  *
1045  * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1046  * respectively, with an error less than 1%. The actual rates are determined
1047  * by
1048  *
1049  *      div = round(freq / (2 x prescale x request))
1050  *      actual = freq / (2 x prescale x div)
1051  *
1052  * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1053  * or 1 otherwise.
1054  * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1055  * otherwise.
1056  */
1057 static void cp210x_change_speed(struct tty_struct *tty,
1058                 struct usb_serial_port *port, struct ktermios *old_termios)
1059 {
1060         u32 baud;
1061
1062         baud = tty->termios.c_ospeed;
1063
1064         /* This maps the requested rate to a rate valid on cp2102 or cp2103,
1065          * or to an arbitrary rate in [1M,2M].
1066          *
1067          * NOTE: B0 is not implemented.
1068          */
1069         baud = cp210x_quantise_baudrate(baud);
1070
1071         dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1072         if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1073                 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1074                 if (old_termios)
1075                         baud = old_termios->c_ospeed;
1076                 else
1077                         baud = 9600;
1078         }
1079
1080         tty_encode_baud_rate(tty, baud, baud);
1081 }
1082
1083 static void cp210x_set_termios(struct tty_struct *tty,
1084                 struct usb_serial_port *port, struct ktermios *old_termios)
1085 {
1086         struct device *dev = &port->dev;
1087         unsigned int cflag, old_cflag;
1088         u16 bits;
1089
1090         cflag = tty->termios.c_cflag;
1091         old_cflag = old_termios->c_cflag;
1092
1093         if (tty->termios.c_ospeed != old_termios->c_ospeed)
1094                 cp210x_change_speed(tty, port, old_termios);
1095
1096         /* If the number of data bits is to be updated */
1097         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
1098                 cp210x_get_line_ctl(port, &bits);
1099                 bits &= ~BITS_DATA_MASK;
1100                 switch (cflag & CSIZE) {
1101                 case CS5:
1102                         bits |= BITS_DATA_5;
1103                         dev_dbg(dev, "%s - data bits = 5\n", __func__);
1104                         break;
1105                 case CS6:
1106                         bits |= BITS_DATA_6;
1107                         dev_dbg(dev, "%s - data bits = 6\n", __func__);
1108                         break;
1109                 case CS7:
1110                         bits |= BITS_DATA_7;
1111                         dev_dbg(dev, "%s - data bits = 7\n", __func__);
1112                         break;
1113                 case CS8:
1114                 default:
1115                         bits |= BITS_DATA_8;
1116                         dev_dbg(dev, "%s - data bits = 8\n", __func__);
1117                         break;
1118                 }
1119                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1120                         dev_dbg(dev, "Number of data bits requested not supported by device\n");
1121         }
1122
1123         if ((cflag     & (PARENB|PARODD|CMSPAR)) !=
1124             (old_cflag & (PARENB|PARODD|CMSPAR))) {
1125                 cp210x_get_line_ctl(port, &bits);
1126                 bits &= ~BITS_PARITY_MASK;
1127                 if (cflag & PARENB) {
1128                         if (cflag & CMSPAR) {
1129                                 if (cflag & PARODD) {
1130                                         bits |= BITS_PARITY_MARK;
1131                                         dev_dbg(dev, "%s - parity = MARK\n", __func__);
1132                                 } else {
1133                                         bits |= BITS_PARITY_SPACE;
1134                                         dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1135                                 }
1136                         } else {
1137                                 if (cflag & PARODD) {
1138                                         bits |= BITS_PARITY_ODD;
1139                                         dev_dbg(dev, "%s - parity = ODD\n", __func__);
1140                                 } else {
1141                                         bits |= BITS_PARITY_EVEN;
1142                                         dev_dbg(dev, "%s - parity = EVEN\n", __func__);
1143                                 }
1144                         }
1145                 }
1146                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1147                         dev_dbg(dev, "Parity mode not supported by device\n");
1148         }
1149
1150         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
1151                 cp210x_get_line_ctl(port, &bits);
1152                 bits &= ~BITS_STOP_MASK;
1153                 if (cflag & CSTOPB) {
1154                         bits |= BITS_STOP_2;
1155                         dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1156                 } else {
1157                         bits |= BITS_STOP_1;
1158                         dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1159                 }
1160                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1161                         dev_dbg(dev, "Number of stop bits requested not supported by device\n");
1162         }
1163
1164         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
1165                 struct cp210x_flow_ctl flow_ctl;
1166                 u32 ctl_hs;
1167                 u32 flow_repl;
1168
1169                 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1170                                 sizeof(flow_ctl));
1171                 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1172                 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1173                 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1174                                 __func__, ctl_hs, flow_repl);
1175
1176                 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1177                 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1178                 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1179                 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1180                 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1181                 if (cflag & CRTSCTS) {
1182                         ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1183
1184                         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1185                         flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1186                                         CP210X_SERIAL_RTS_FLOW_CTL);
1187                         dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1188                 } else {
1189                         ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1190
1191                         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1192                         flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1193                                         CP210X_SERIAL_RTS_ACTIVE);
1194                         dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1195                 }
1196
1197                 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1198                                 __func__, ctl_hs, flow_repl);
1199                 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1200                 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1201                 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1202                                 sizeof(flow_ctl));
1203         }
1204
1205 }
1206
1207 static int cp210x_tiocmset(struct tty_struct *tty,
1208                 unsigned int set, unsigned int clear)
1209 {
1210         struct usb_serial_port *port = tty->driver_data;
1211         return cp210x_tiocmset_port(port, set, clear);
1212 }
1213
1214 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1215                 unsigned int set, unsigned int clear)
1216 {
1217         u16 control = 0;
1218
1219         if (set & TIOCM_RTS) {
1220                 control |= CONTROL_RTS;
1221                 control |= CONTROL_WRITE_RTS;
1222         }
1223         if (set & TIOCM_DTR) {
1224                 control |= CONTROL_DTR;
1225                 control |= CONTROL_WRITE_DTR;
1226         }
1227         if (clear & TIOCM_RTS) {
1228                 control &= ~CONTROL_RTS;
1229                 control |= CONTROL_WRITE_RTS;
1230         }
1231         if (clear & TIOCM_DTR) {
1232                 control &= ~CONTROL_DTR;
1233                 control |= CONTROL_WRITE_DTR;
1234         }
1235
1236         dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1237
1238         return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1239 }
1240
1241 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1242 {
1243         if (on)
1244                 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1245         else
1246                 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1247 }
1248
1249 static int cp210x_tiocmget(struct tty_struct *tty)
1250 {
1251         struct usb_serial_port *port = tty->driver_data;
1252         u8 control;
1253         int result;
1254
1255         result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1256         if (result)
1257                 return result;
1258
1259         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1260                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1261                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1262                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1263                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
1264                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
1265
1266         dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1267
1268         return result;
1269 }
1270
1271 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1272 {
1273         struct usb_serial_port *port = tty->driver_data;
1274         u16 state;
1275
1276         if (break_state == 0)
1277                 state = BREAK_OFF;
1278         else
1279                 state = BREAK_ON;
1280         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1281                 state == BREAK_OFF ? "off" : "on");
1282         cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1283 }
1284
1285 #ifdef CONFIG_GPIOLIB
1286 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset)
1287 {
1288         struct usb_serial *serial = gpiochip_get_data(gc);
1289         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1290
1291         switch (offset) {
1292         case 0:
1293                 if (priv->config & CP2105_GPIO0_TXLED_MODE)
1294                         return -ENODEV;
1295                 break;
1296         case 1:
1297                 if (priv->config & (CP2105_GPIO1_RXLED_MODE |
1298                                     CP2105_GPIO1_RS485_MODE))
1299                         return -ENODEV;
1300                 break;
1301         }
1302
1303         return 0;
1304 }
1305
1306 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1307 {
1308         struct usb_serial *serial = gpiochip_get_data(gc);
1309         int result;
1310         u8 buf;
1311
1312         result = cp210x_read_vendor_block(serial, REQTYPE_INTERFACE_TO_HOST,
1313                                           CP210X_READ_LATCH, &buf, sizeof(buf));
1314         if (result < 0)
1315                 return result;
1316
1317         return !!(buf & BIT(gpio));
1318 }
1319
1320 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1321 {
1322         struct usb_serial *serial = gpiochip_get_data(gc);
1323         struct cp210x_gpio_write buf;
1324
1325         if (value == 1)
1326                 buf.state = BIT(gpio);
1327         else
1328                 buf.state = 0;
1329
1330         buf.mask = BIT(gpio);
1331
1332         cp210x_write_vendor_block(serial, REQTYPE_HOST_TO_INTERFACE,
1333                                   CP210X_WRITE_LATCH, &buf, sizeof(buf));
1334 }
1335
1336 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1337 {
1338         /* Hardware does not support an input mode */
1339         return 0;
1340 }
1341
1342 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1343 {
1344         /* Hardware does not support an input mode */
1345         return -ENOTSUPP;
1346 }
1347
1348 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1349                                         int value)
1350 {
1351         return 0;
1352 }
1353
1354 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1355                                   unsigned long config)
1356 {
1357         struct usb_serial *serial = gpiochip_get_data(gc);
1358         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1359         enum pin_config_param param = pinconf_to_config_param(config);
1360
1361         /* Succeed only if in correct mode (this can't be set at runtime) */
1362         if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1363             (priv->gpio_mode & BIT(gpio)))
1364                 return 0;
1365
1366         if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1367             !(priv->gpio_mode & BIT(gpio)))
1368                 return 0;
1369
1370         return -ENOTSUPP;
1371 }
1372
1373 /*
1374  * This function is for configuring GPIO using shared pins, where other signals
1375  * are made unavailable by configuring the use of GPIO. This is believed to be
1376  * only applicable to the cp2105 at this point, the other devices supported by
1377  * this driver that provide GPIO do so in a way that does not impact other
1378  * signals and are thus expected to have very different initialisation.
1379  */
1380 static int cp2105_shared_gpio_init(struct usb_serial *serial)
1381 {
1382         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1383         struct cp210x_pin_mode mode;
1384         struct cp210x_config config;
1385         u8 intf_num = cp210x_interface_num(serial);
1386         int result;
1387
1388         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1389                                           CP210X_GET_DEVICEMODE, &mode,
1390                                           sizeof(mode));
1391         if (result < 0)
1392                 return result;
1393
1394         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1395                                           CP210X_GET_PORTCONFIG, &config,
1396                                           sizeof(config));
1397         if (result < 0)
1398                 return result;
1399
1400         /*  2 banks of GPIO - One for the pins taken from each serial port */
1401         if (intf_num == 0) {
1402                 if (mode.eci == CP210X_PIN_MODE_MODEM)
1403                         return 0;
1404
1405                 priv->config = config.eci_cfg;
1406                 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
1407                                                 CP210X_ECI_GPIO_MODE_MASK) >>
1408                                                 CP210X_ECI_GPIO_MODE_OFFSET);
1409                 priv->gc.ngpio = 2;
1410         } else if (intf_num == 1) {
1411                 if (mode.sci == CP210X_PIN_MODE_MODEM)
1412                         return 0;
1413
1414                 priv->config = config.sci_cfg;
1415                 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
1416                                                 CP210X_SCI_GPIO_MODE_MASK) >>
1417                                                 CP210X_SCI_GPIO_MODE_OFFSET);
1418                 priv->gc.ngpio = 3;
1419         } else {
1420                 return -ENODEV;
1421         }
1422
1423         priv->gc.label = "cp210x";
1424         priv->gc.request = cp210x_gpio_request;
1425         priv->gc.get_direction = cp210x_gpio_direction_get;
1426         priv->gc.direction_input = cp210x_gpio_direction_input;
1427         priv->gc.direction_output = cp210x_gpio_direction_output;
1428         priv->gc.get = cp210x_gpio_get;
1429         priv->gc.set = cp210x_gpio_set;
1430         priv->gc.set_config = cp210x_gpio_set_config;
1431         priv->gc.owner = THIS_MODULE;
1432         priv->gc.parent = &serial->interface->dev;
1433         priv->gc.base = -1;
1434         priv->gc.can_sleep = true;
1435
1436         result = gpiochip_add_data(&priv->gc, serial);
1437         if (!result)
1438                 priv->gpio_registered = true;
1439
1440         return result;
1441 }
1442
1443 static void cp210x_gpio_remove(struct usb_serial *serial)
1444 {
1445         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1446
1447         if (priv->gpio_registered) {
1448                 gpiochip_remove(&priv->gc);
1449                 priv->gpio_registered = false;
1450         }
1451 }
1452
1453 #else
1454
1455 static int cp2105_shared_gpio_init(struct usb_serial *serial)
1456 {
1457         return 0;
1458 }
1459
1460 static void cp210x_gpio_remove(struct usb_serial *serial)
1461 {
1462         /* Nothing to do */
1463 }
1464
1465 #endif
1466
1467 static int cp210x_port_probe(struct usb_serial_port *port)
1468 {
1469         struct usb_serial *serial = port->serial;
1470         struct cp210x_port_private *port_priv;
1471         int ret;
1472
1473         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1474         if (!port_priv)
1475                 return -ENOMEM;
1476
1477         port_priv->bInterfaceNumber = cp210x_interface_num(serial);
1478
1479         usb_set_serial_port_data(port, port_priv);
1480
1481         ret = cp210x_detect_swapped_line_ctl(port);
1482         if (ret) {
1483                 kfree(port_priv);
1484                 return ret;
1485         }
1486
1487         return 0;
1488 }
1489
1490 static int cp210x_port_remove(struct usb_serial_port *port)
1491 {
1492         struct cp210x_port_private *port_priv;
1493
1494         port_priv = usb_get_serial_port_data(port);
1495         kfree(port_priv);
1496
1497         return 0;
1498 }
1499
1500 static int cp210x_attach(struct usb_serial *serial)
1501 {
1502         int result;
1503         struct cp210x_serial_private *priv;
1504
1505         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1506         if (!priv)
1507                 return -ENOMEM;
1508
1509         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1510                                           CP210X_GET_PARTNUM, &priv->partnum,
1511                                           sizeof(priv->partnum));
1512         if (result < 0) {
1513                 dev_warn(&serial->interface->dev,
1514                          "querying part number failed\n");
1515                 priv->partnum = CP210X_PARTNUM_UNKNOWN;
1516         }
1517
1518         usb_set_serial_data(serial, priv);
1519
1520         if (priv->partnum == CP210X_PARTNUM_CP2105) {
1521                 result = cp2105_shared_gpio_init(serial);
1522                 if (result < 0) {
1523                         dev_err(&serial->interface->dev,
1524                                 "GPIO initialisation failed, continuing without GPIO support\n");
1525                 }
1526         }
1527
1528         return 0;
1529 }
1530
1531 static void cp210x_disconnect(struct usb_serial *serial)
1532 {
1533         cp210x_gpio_remove(serial);
1534 }
1535
1536 static void cp210x_release(struct usb_serial *serial)
1537 {
1538         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1539
1540         cp210x_gpio_remove(serial);
1541
1542         kfree(priv);
1543 }
1544
1545 module_usb_serial_driver(serial_drivers, id_table);
1546
1547 MODULE_DESCRIPTION(DRIVER_DESC);
1548 MODULE_LICENSE("GPL v2");