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 ([email protected])
   6  *
   7  * Support to set flow control line levels using TIOCMGET and TIOCMSET
   8  * thanks to Karl Hiramoto [email protected]. RTSCTS hardware flow
   9  * control thanks to Munir Nassar [email protected]
  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 static void cp210x_process_read_urb(struct urb *urb);
  54 static void cp210x_enable_event_mode(struct usb_serial_port *port);
  55 static void cp210x_disable_event_mode(struct usb_serial_port *port);
  56
  57 static const struct usb_device_id id_table[] = {
  58         { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
  59         { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
  60         { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  61         { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  62         { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
  63         { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
  64         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
  65         { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
  66         { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
  67         { USB_DEVICE(0x0B00, 0x3070) }, /* Ingenico 3070 */
  68         { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
  69         { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
  70         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  71         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
  72         { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
  73         { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
  74         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  75         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  76         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  77         { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
  78         { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
  79         { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
  80         { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
  81         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  82         { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
  83         { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
  84         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
  85         { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
  86         { USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */
  87         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  88         { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
  89         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  90         { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
  91         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  92         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
  93         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  94         { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
  95         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  96         { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
  97         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
  98         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
  99         { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
 100         { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
 101         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
 102         { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
 103         { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */
 104         { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */
 105         { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */
 106         { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
 107         { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
 108         { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
 109         { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
 110         { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
 111         { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
 112         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
 113         { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
 114         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
 115         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
 116         { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
 117         { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
 118         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
 119         { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
 120         { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
 121         { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
 122         { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
 123         { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */
 124         { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */
 125         { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */
 126         { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
 127         { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
 128         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
 129         { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
 130         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
 131         { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */
 132         { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
 133         { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
 134         { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
 135         { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
 136         { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
 137         { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
 138         { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
 139         { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */
 140         { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */
 141         { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */
 142         { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
 143         { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
 144         { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
 145         { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
 146         { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
 147         { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
 148         { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
 149         { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
 150         { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
 151         { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */
 152         { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */
 153         { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
 154         { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
 155         { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
 156         { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
 157         { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */
 158         { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */
 159         { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
 160         { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
 161         { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
 162         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 163         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 164         { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */
 165         { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
 166         { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
 167         { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */
 168         { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */
 169         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 170         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 171         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 172         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 173         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 174         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 175         { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
 176         { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
 177         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 178         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 179         { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */
 180         { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
 181         { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
 182         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 183         { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
 184         { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
 185         { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
 186         { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
 187         { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
 188         { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
 189         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 190         { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
 191         { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
 192         { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
 193         { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
 194         { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
 195         { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
 196         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
 197         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
 198         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 199         { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
 200         { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
 201         { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
 202         { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
 203         { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
 204         { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
 205         { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
 206         { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
 207         { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
 208         { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
 209         { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
 210         { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
 211         { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
 212         { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
 213         { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
 214         { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
 215         { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
 216         { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
 217         { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
 218         { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
 219         { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
 220         { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
 221         { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
 222         { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
 223         { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
 224         { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
 225         { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
 226         { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
 227         { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
 228         { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
 229         { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
 230         { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
 231         { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
 232         { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
 233         { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
 234         { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
 235         { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
 236         { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
 237         { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
 238         { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
 239         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 240         { } /* Terminating Entry */
 241 };
 242
 243 MODULE_DEVICE_TABLE(usb, id_table);
 244
 245 struct cp210x_serial_private {
 246 #ifdef CONFIG_GPIOLIB
 247         struct gpio_chip        gc;
 248         bool                    gpio_registered;
 249         u8                      gpio_pushpull;
 250         u8                      gpio_altfunc;
 251         u8                      gpio_input;
 252 #endif
 253         u8                      partnum;
 254         speed_t                 min_speed;
 255         speed_t                 max_speed;
 256         bool                    use_actual_rate;
 257 };
 258
 259 enum cp210x_event_state {
 260         ES_DATA,
 261         ES_ESCAPE,
 262         ES_LSR,
 263         ES_LSR_DATA_0,
 264         ES_LSR_DATA_1,
 265         ES_MSR
 266 };
 267
 268 struct cp210x_port_private {
 269         u8                      bInterfaceNumber;
 270         bool                    has_swapped_line_ctl;
 271         bool                    event_mode;
 272         enum cp210x_event_state event_state;
 273         u8 lsr;
 274 };
 275
 276 static struct usb_serial_driver cp210x_device = {
 277         .driver = {
 278                 .owner =        THIS_MODULE,
 279                 .name =         "cp210x",
 280         },
 281         .id_table               = id_table,
 282         .num_ports              = 1,
 283         .bulk_in_size           = 256,
 284         .bulk_out_size          = 256,
 285         .open                   = cp210x_open,
 286         .close                  = cp210x_close,
 287         .break_ctl              = cp210x_break_ctl,
 288         .set_termios            = cp210x_set_termios,
 289         .tx_empty               = cp210x_tx_empty,
 290         .throttle               = usb_serial_generic_throttle,
 291         .unthrottle             = usb_serial_generic_unthrottle,
 292         .tiocmget               = cp210x_tiocmget,
 293         .tiocmset               = cp210x_tiocmset,
 294         .get_icount             = usb_serial_generic_get_icount,
 295         .attach                 = cp210x_attach,
 296         .disconnect             = cp210x_disconnect,
 297         .release                = cp210x_release,
 298         .port_probe             = cp210x_port_probe,
 299         .port_remove            = cp210x_port_remove,
 300         .dtr_rts                = cp210x_dtr_rts,
 301         .process_read_urb       = cp210x_process_read_urb,
 302 };
 303
 304 static struct usb_serial_driver * const serial_drivers[] = {
 305         &cp210x_device, NULL
 306 };
 307
 308 /* Config request types */
 309 #define REQTYPE_HOST_TO_INTERFACE       0x41
 310 #define REQTYPE_INTERFACE_TO_HOST       0xc1
 311 #define REQTYPE_HOST_TO_DEVICE  0x40
 312 #define REQTYPE_DEVICE_TO_HOST  0xc0
 313
 314 /* Config request codes */
 315 #define CP210X_IFC_ENABLE       0x00
 316 #define CP210X_SET_BAUDDIV      0x01
 317 #define CP210X_GET_BAUDDIV      0x02
 318 #define CP210X_SET_LINE_CTL     0x03
 319 #define CP210X_GET_LINE_CTL     0x04
 320 #define CP210X_SET_BREAK        0x05
 321 #define CP210X_IMM_CHAR         0x06
 322 #define CP210X_SET_MHS          0x07
 323 #define CP210X_GET_MDMSTS       0x08
 324 #define CP210X_SET_XON          0x09
 325 #define CP210X_SET_XOFF         0x0A
 326 #define CP210X_SET_EVENTMASK    0x0B
 327 #define CP210X_GET_EVENTMASK    0x0C
 328 #define CP210X_SET_CHAR         0x0D
 329 #define CP210X_GET_CHARS        0x0E
 330 #define CP210X_GET_PROPS        0x0F
 331 #define CP210X_GET_COMM_STATUS  0x10
 332 #define CP210X_RESET            0x11
 333 #define CP210X_PURGE            0x12
 334 #define CP210X_SET_FLOW         0x13
 335 #define CP210X_GET_FLOW         0x14
 336 #define CP210X_EMBED_EVENTS     0x15
 337 #define CP210X_GET_EVENTSTATE   0x16
 338 #define CP210X_SET_CHARS        0x19
 339 #define CP210X_GET_BAUDRATE     0x1D
 340 #define CP210X_SET_BAUDRATE     0x1E
 341 #define CP210X_VENDOR_SPECIFIC  0xFF
 342
 343 /* CP210X_IFC_ENABLE */
 344 #define UART_ENABLE             0x0001
 345 #define UART_DISABLE            0x0000
 346
 347 /* CP210X_(SET|GET)_BAUDDIV */
 348 #define BAUD_RATE_GEN_FREQ      0x384000
 349
 350 /* CP210X_(SET|GET)_LINE_CTL */
 351 #define BITS_DATA_MASK          0X0f00
 352 #define BITS_DATA_5             0X0500
 353 #define BITS_DATA_6             0X0600
 354 #define BITS_DATA_7             0X0700
 355 #define BITS_DATA_8             0X0800
 356 #define BITS_DATA_9             0X0900
 357
 358 #define BITS_PARITY_MASK        0x00f0
 359 #define BITS_PARITY_NONE        0x0000
 360 #define BITS_PARITY_ODD         0x0010
 361 #define BITS_PARITY_EVEN        0x0020
 362 #define BITS_PARITY_MARK        0x0030
 363 #define BITS_PARITY_SPACE       0x0040
 364
 365 #define BITS_STOP_MASK          0x000f
 366 #define BITS_STOP_1             0x0000
 367 #define BITS_STOP_1_5           0x0001
 368 #define BITS_STOP_2             0x0002
 369
 370 /* CP210X_SET_BREAK */
 371 #define BREAK_ON                0x0001
 372 #define BREAK_OFF               0x0000
 373
 374 /* CP210X_(SET_MHS|GET_MDMSTS) */
 375 #define CONTROL_DTR             0x0001
 376 #define CONTROL_RTS             0x0002
 377 #define CONTROL_CTS             0x0010
 378 #define CONTROL_DSR             0x0020
 379 #define CONTROL_RING            0x0040
 380 #define CONTROL_DCD             0x0080
 381 #define CONTROL_WRITE_DTR       0x0100
 382 #define CONTROL_WRITE_RTS       0x0200
 383
 384 /* CP210X_VENDOR_SPECIFIC values */
 385 #define CP210X_READ_2NCONFIG    0x000E
 386 #define CP210X_READ_LATCH       0x00C2
 387 #define CP210X_GET_PARTNUM      0x370B
 388 #define CP210X_GET_PORTCONFIG   0x370C
 389 #define CP210X_GET_DEVICEMODE   0x3711
 390 #define CP210X_WRITE_LATCH      0x37E1
 391
 392 /* Part number definitions */
 393 #define CP210X_PARTNUM_CP2101   0x01
 394 #define CP210X_PARTNUM_CP2102   0x02
 395 #define CP210X_PARTNUM_CP2103   0x03
 396 #define CP210X_PARTNUM_CP2104   0x04
 397 #define CP210X_PARTNUM_CP2105   0x05
 398 #define CP210X_PARTNUM_CP2108   0x08
 399 #define CP210X_PARTNUM_CP2102N_QFN28    0x20
 400 #define CP210X_PARTNUM_CP2102N_QFN24    0x21
 401 #define CP210X_PARTNUM_CP2102N_QFN20    0x22
 402 #define CP210X_PARTNUM_UNKNOWN  0xFF
 403
 404 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
 405 struct cp210x_comm_status {
 406         __le32   ulErrors;
 407         __le32   ulHoldReasons;
 408         __le32   ulAmountInInQueue;
 409         __le32   ulAmountInOutQueue;
 410         u8       bEofReceived;
 411         u8       bWaitForImmediate;
 412         u8       bReserved;
 413 } __packed;
 414
 415 /*
 416  * CP210X_PURGE - 16 bits passed in wValue of USB request.
 417  * SiLabs app note AN571 gives a strange description of the 4 bits:
 418  * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
 419  * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
 420  */
 421 #define PURGE_ALL               0x000f
 422
 423 /* CP210X_EMBED_EVENTS */
 424 #define CP210X_ESCCHAR          0xec
 425
 426 #define CP210X_LSR_OVERRUN      BIT(1)
 427 #define CP210X_LSR_PARITY       BIT(2)
 428 #define CP210X_LSR_FRAME        BIT(3)
 429 #define CP210X_LSR_BREAK        BIT(4)
 430
 431
 432 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
 433 struct cp210x_flow_ctl {
 434         __le32  ulControlHandshake;
 435         __le32  ulFlowReplace;
 436         __le32  ulXonLimit;
 437         __le32  ulXoffLimit;
 438 };
 439
 440 /* cp210x_flow_ctl::ulControlHandshake */
 441 #define CP210X_SERIAL_DTR_MASK          GENMASK(1, 0)
 442 #define CP210X_SERIAL_DTR_SHIFT(_mode)  (_mode)
 443 #define CP210X_SERIAL_CTS_HANDSHAKE     BIT(3)
 444 #define CP210X_SERIAL_DSR_HANDSHAKE     BIT(4)
 445 #define CP210X_SERIAL_DCD_HANDSHAKE     BIT(5)
 446 #define CP210X_SERIAL_DSR_SENSITIVITY   BIT(6)
 447
 448 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
 449 #define CP210X_SERIAL_DTR_INACTIVE      0
 450 #define CP210X_SERIAL_DTR_ACTIVE        1
 451 #define CP210X_SERIAL_DTR_FLOW_CTL      2
 452
 453 /* cp210x_flow_ctl::ulFlowReplace */
 454 #define CP210X_SERIAL_AUTO_TRANSMIT     BIT(0)
 455 #define CP210X_SERIAL_AUTO_RECEIVE      BIT(1)
 456 #define CP210X_SERIAL_ERROR_CHAR        BIT(2)
 457 #define CP210X_SERIAL_NULL_STRIPPING    BIT(3)
 458 #define CP210X_SERIAL_BREAK_CHAR        BIT(4)
 459 #define CP210X_SERIAL_RTS_MASK          GENMASK(7, 6)
 460 #define CP210X_SERIAL_RTS_SHIFT(_mode)  (_mode << 6)
 461 #define CP210X_SERIAL_XOFF_CONTINUE     BIT(31)
 462
 463 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
 464 #define CP210X_SERIAL_RTS_INACTIVE      0
 465 #define CP210X_SERIAL_RTS_ACTIVE        1
 466 #define CP210X_SERIAL_RTS_FLOW_CTL      2
 467
 468 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
 469 struct cp210x_pin_mode {
 470         u8      eci;
 471         u8      sci;
 472 };
 473
 474 #define CP210X_PIN_MODE_MODEM           0
 475 #define CP210X_PIN_MODE_GPIO            BIT(0)
 476
 477 /*
 478  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes
 479  * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes.
 480  */
 481 struct cp210x_dual_port_config {
 482         __le16  gpio_mode;
 483         u8      __pad0[2];
 484         __le16  reset_state;
 485         u8      __pad1[4];
 486         __le16  suspend_state;
 487         u8      sci_cfg;
 488         u8      eci_cfg;
 489         u8      device_cfg;
 490 } __packed;
 491
 492 /*
 493  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes
 494  * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes.
 495  */
 496 struct cp210x_single_port_config {
 497         __le16  gpio_mode;
 498         u8      __pad0[2];
 499         __le16  reset_state;
 500         u8      __pad1[4];
 501         __le16  suspend_state;
 502         u8      device_cfg;
 503 } __packed;
 504
 505 /* GPIO modes */
 506 #define CP210X_SCI_GPIO_MODE_OFFSET     9
 507 #define CP210X_SCI_GPIO_MODE_MASK       GENMASK(11, 9)
 508
 509 #define CP210X_ECI_GPIO_MODE_OFFSET     2
 510 #define CP210X_ECI_GPIO_MODE_MASK       GENMASK(3, 2)
 511
 512 #define CP210X_GPIO_MODE_OFFSET         8
 513 #define CP210X_GPIO_MODE_MASK           GENMASK(11, 8)
 514
 515 /* CP2105 port configuration values */
 516 #define CP2105_GPIO0_TXLED_MODE         BIT(0)
 517 #define CP2105_GPIO1_RXLED_MODE         BIT(1)
 518 #define CP2105_GPIO1_RS485_MODE         BIT(2)
 519
 520 /* CP2104 port configuration values */
 521 #define CP2104_GPIO0_TXLED_MODE         BIT(0)
 522 #define CP2104_GPIO1_RXLED_MODE         BIT(1)
 523 #define CP2104_GPIO2_RS485_MODE         BIT(2)
 524
 525 /* CP2102N configuration array indices */
 526 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX      2
 527 #define CP210X_2NCONFIG_GPIO_MODE_IDX           581
 528 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX       587
 529 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX        600
 530
 531 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
 532 struct cp210x_gpio_write {
 533         u8      mask;
 534         u8      state;
 535 };
 536
 537 /*
 538  * Helper to get interface number when we only have struct usb_serial.
 539  */
 540 static u8 cp210x_interface_num(struct usb_serial *serial)
 541 {
 542         struct usb_host_interface *cur_altsetting;
 543
 544         cur_altsetting = serial->interface->cur_altsetting;
 545
 546         return cur_altsetting->desc.bInterfaceNumber;
 547 }
 548
 549 /*
 550  * Reads a variable-sized block of CP210X_ registers, identified by req.
 551  * Returns data into buf in native USB byte order.
 552  */
 553 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
 554                 void *buf, int bufsize)
 555 {
 556         struct usb_serial *serial = port->serial;
 557         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 558         void *dmabuf;
 559         int result;
 560
 561         dmabuf = kmalloc(bufsize, GFP_KERNEL);
 562         if (!dmabuf) {
 563                 /*
 564                  * FIXME Some callers don't bother to check for error,
 565                  * at least give them consistent junk until they are fixed
 566                  */
 567                 memset(buf, 0, bufsize);
 568                 return -ENOMEM;
 569         }
 570
 571         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 572                         req, REQTYPE_INTERFACE_TO_HOST, 0,
 573                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 574                         USB_CTRL_SET_TIMEOUT);
 575         if (result == bufsize) {
 576                 memcpy(buf, dmabuf, bufsize);
 577                 result = 0;
 578         } else {
 579                 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
 580                                 req, bufsize, result);
 581                 if (result >= 0)
 582                         result = -EIO;
 583
 584                 /*
 585                  * FIXME Some callers don't bother to check for error,
 586                  * at least give them consistent junk until they are fixed
 587                  */
 588                 memset(buf, 0, bufsize);
 589         }
 590
 591         kfree(dmabuf);
 592
 593         return result;
 594 }
 595
 596 /*
 597  * Reads any 32-bit CP210X_ register identified by req.
 598  */
 599 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
 600 {
 601         __le32 le32_val;
 602         int err;
 603
 604         err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
 605         if (err) {
 606                 /*
 607                  * FIXME Some callers don't bother to check for error,
 608                  * at least give them consistent junk until they are fixed
 609                  */
 610                 *val = 0;
 611                 return err;
 612         }
 613
 614         *val = le32_to_cpu(le32_val);
 615
 616         return 0;
 617 }
 618
 619 /*
 620  * Reads any 16-bit CP210X_ register identified by req.
 621  */
 622 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
 623 {
 624         __le16 le16_val;
 625         int err;
 626
 627         err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
 628         if (err)
 629                 return err;
 630
 631         *val = le16_to_cpu(le16_val);
 632
 633         return 0;
 634 }
 635
 636 /*
 637  * Reads any 8-bit CP210X_ register identified by req.
 638  */
 639 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
 640 {
 641         return cp210x_read_reg_block(port, req, val, sizeof(*val));
 642 }
 643
 644 /*
 645  * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
 646  * Returns data into buf in native USB byte order.
 647  */
 648 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
 649                                     void *buf, int bufsize)
 650 {
 651         void *dmabuf;
 652         int result;
 653
 654         dmabuf = kmalloc(bufsize, GFP_KERNEL);
 655         if (!dmabuf)
 656                 return -ENOMEM;
 657
 658         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 659                                  CP210X_VENDOR_SPECIFIC, type, val,
 660                                  cp210x_interface_num(serial), dmabuf, bufsize,
 661                                  USB_CTRL_GET_TIMEOUT);
 662         if (result == bufsize) {
 663                 memcpy(buf, dmabuf, bufsize);
 664                 result = 0;
 665         } else {
 666                 dev_err(&serial->interface->dev,
 667                         "failed to get vendor val 0x%04x size %d: %d\n", val,
 668                         bufsize, result);
 669                 if (result >= 0)
 670                         result = -EIO;
 671         }
 672
 673         kfree(dmabuf);
 674
 675         return result;
 676 }
 677
 678 /*
 679  * Writes any 16-bit CP210X_ register (req) whose value is passed
 680  * entirely in the wValue field of the USB request.
 681  */
 682 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
 683 {
 684         struct usb_serial *serial = port->serial;
 685         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 686         int result;
 687
 688         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 689                         req, REQTYPE_HOST_TO_INTERFACE, val,
 690                         port_priv->bInterfaceNumber, NULL, 0,
 691                         USB_CTRL_SET_TIMEOUT);
 692         if (result < 0) {
 693                 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
 694                                 req, result);
 695         }
 696
 697         return result;
 698 }
 699
 700 /*
 701  * Writes a variable-sized block of CP210X_ registers, identified by req.
 702  * Data in buf must be in native USB byte order.
 703  */
 704 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
 705                 void *buf, int bufsize)
 706 {
 707         struct usb_serial *serial = port->serial;
 708         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 709         void *dmabuf;
 710         int result;
 711
 712         dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
 713         if (!dmabuf)
 714                 return -ENOMEM;
 715
 716         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 717                         req, REQTYPE_HOST_TO_INTERFACE, 0,
 718                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 719                         USB_CTRL_SET_TIMEOUT);
 720
 721         kfree(dmabuf);
 722
 723         if (result == bufsize) {
 724                 result = 0;
 725         } else {
 726                 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
 727                                 req, bufsize, result);
 728                 if (result >= 0)
 729                         result = -EIO;
 730         }
 731
 732         return result;
 733 }
 734
 735 /*
 736  * Writes any 32-bit CP210X_ register identified by req.
 737  */
 738 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
 739 {
 740         __le32 le32_val;
 741
 742         le32_val = cpu_to_le32(val);
 743
 744         return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
 745 }
 746
 747 #ifdef CONFIG_GPIOLIB
 748 /*
 749  * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
 750  * Data in buf must be in native USB byte order.
 751  */
 752 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
 753                                      u16 val, void *buf, int bufsize)
 754 {
 755         void *dmabuf;
 756         int result;
 757
 758         dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
 759         if (!dmabuf)
 760                 return -ENOMEM;
 761
 762         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 763                                  CP210X_VENDOR_SPECIFIC, type, val,
 764                                  cp210x_interface_num(serial), dmabuf, bufsize,
 765                                  USB_CTRL_SET_TIMEOUT);
 766
 767         kfree(dmabuf);
 768
 769         if (result == bufsize) {
 770                 result = 0;
 771         } else {
 772                 dev_err(&serial->interface->dev,
 773                         "failed to set vendor val 0x%04x size %d: %d\n", val,
 774                         bufsize, result);
 775                 if (result >= 0)
 776                         result = -EIO;
 777         }
 778
 779         return result;
 780 }
 781 #endif
 782
 783 /*
 784  * Detect CP2108 GET_LINE_CTL bug and activate workaround.
 785  * Write a known good value 0x800, read it back.
 786  * If it comes back swapped the bug is detected.
 787  * Preserve the original register value.
 788  */
 789 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
 790 {
 791         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 792         u16 line_ctl_save;
 793         u16 line_ctl_test;
 794         int err;
 795
 796         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
 797         if (err)
 798                 return err;
 799
 800         err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
 801         if (err)
 802                 return err;
 803
 804         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
 805         if (err)
 806                 return err;
 807
 808         if (line_ctl_test == 8) {
 809                 port_priv->has_swapped_line_ctl = true;
 810                 line_ctl_save = swab16(line_ctl_save);
 811         }
 812
 813         return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
 814 }
 815
 816 /*
 817  * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
 818  * to workaround cp2108 bug and get correct value.
 819  */
 820 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
 821 {
 822         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 823         int err;
 824
 825         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
 826         if (err)
 827                 return err;
 828
 829         /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
 830         if (port_priv->has_swapped_line_ctl)
 831                 *ctl = swab16(*ctl);
 832
 833         return 0;
 834 }
 835
 836 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 837 {
 838         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 839         int result;
 840
 841         result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
 842         if (result) {
 843                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
 844                 return result;
 845         }
 846
 847         /* Configure the termios structure */
 848         cp210x_get_termios(tty, port);
 849
 850         if (tty) {
 851                 /* The baud rate must be initialised on cp2104 */
 852                 cp210x_change_speed(tty, port, NULL);
 853
 854                 if (I_INPCK(tty))
 855                         cp210x_enable_event_mode(port);
 856         }
 857
 858         result = usb_serial_generic_open(tty, port);
 859         if (result)
 860                 goto err_disable;
 861
 862         return 0;
 863
 864 err_disable:
 865         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 866         port_priv->event_mode = false;
 867
 868         return result;
 869 }
 870
 871 static void cp210x_close(struct usb_serial_port *port)
 872 {
 873         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 874
 875         usb_serial_generic_close(port);
 876
 877         /* Clear both queues; cp2108 needs this to avoid an occasional hang */
 878         cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
 879
 880         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 881
 882         /* Disabling the interface disables event-insertion mode. */
 883         port_priv->event_mode = false;
 884 }
 885
 886 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag)
 887 {
 888         if (lsr & CP210X_LSR_BREAK) {
 889                 port->icount.brk++;
 890                 *flag = TTY_BREAK;
 891         } else if (lsr & CP210X_LSR_PARITY) {
 892                 port->icount.parity++;
 893                 *flag = TTY_PARITY;
 894         } else if (lsr & CP210X_LSR_FRAME) {
 895                 port->icount.frame++;
 896                 *flag = TTY_FRAME;
 897         }
 898
 899         if (lsr & CP210X_LSR_OVERRUN) {
 900                 port->icount.overrun++;
 901                 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
 902         }
 903 }
 904
 905 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag)
 906 {
 907         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 908
 909         switch (port_priv->event_state) {
 910         case ES_DATA:
 911                 if (*ch == CP210X_ESCCHAR) {
 912                         port_priv->event_state = ES_ESCAPE;
 913                         break;
 914                 }
 915                 return false;
 916         case ES_ESCAPE:
 917                 switch (*ch) {
 918                 case 0:
 919                         dev_dbg(&port->dev, "%s - escape char\n", __func__);
 920                         *ch = CP210X_ESCCHAR;
 921                         port_priv->event_state = ES_DATA;
 922                         return false;
 923                 case 1:
 924                         port_priv->event_state = ES_LSR_DATA_0;
 925                         break;
 926                 case 2:
 927                         port_priv->event_state = ES_LSR;
 928                         break;
 929                 case 3:
 930                         port_priv->event_state = ES_MSR;
 931                         break;
 932                 default:
 933                         dev_err(&port->dev, "malformed event 0x%02x\n", *ch);
 934                         port_priv->event_state = ES_DATA;
 935                         break;
 936                 }
 937                 break;
 938         case ES_LSR_DATA_0:
 939                 port_priv->lsr = *ch;
 940                 port_priv->event_state = ES_LSR_DATA_1;
 941                 break;
 942         case ES_LSR_DATA_1:
 943                 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n",
 944                                 __func__, port_priv->lsr, *ch);
 945                 cp210x_process_lsr(port, port_priv->lsr, flag);
 946                 port_priv->event_state = ES_DATA;
 947                 return false;
 948         case ES_LSR:
 949                 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch);
 950                 port_priv->lsr = *ch;
 951                 cp210x_process_lsr(port, port_priv->lsr, flag);
 952                 port_priv->event_state = ES_DATA;
 953                 break;
 954         case ES_MSR:
 955                 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch);
 956                 /* unimplemented */
 957                 port_priv->event_state = ES_DATA;
 958                 break;
 959         }
 960
 961         return true;
 962 }
 963
 964 static void cp210x_process_read_urb(struct urb *urb)
 965 {
 966         struct usb_serial_port *port = urb->context;
 967         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 968         unsigned char *ch = urb->transfer_buffer;
 969         char flag;
 970         int i;
 971
 972         if (!urb->actual_length)
 973                 return;
 974
 975         if (port_priv->event_mode) {
 976                 for (i = 0; i < urb->actual_length; i++, ch++) {
 977                         flag = TTY_NORMAL;
 978
 979                         if (cp210x_process_char(port, ch, &flag))
 980                                 continue;
 981
 982                         tty_insert_flip_char(&port->port, *ch, flag);
 983                 }
 984         } else {
 985                 tty_insert_flip_string(&port->port, ch, urb->actual_length);
 986         }
 987         tty_flip_buffer_push(&port->port);
 988 }
 989
 990 /*
 991  * Read how many bytes are waiting in the TX queue.
 992  */
 993 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
 994                 u32 *count)
 995 {
 996         struct usb_serial *serial = port->serial;
 997         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 998         struct cp210x_comm_status *sts;
 999         int result;
1000
1001         sts = kmalloc(sizeof(*sts), GFP_KERNEL);
1002         if (!sts)
1003                 return -ENOMEM;
1004
1005         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
1006                         CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
1007                         0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
1008                         USB_CTRL_GET_TIMEOUT);
1009         if (result == sizeof(*sts)) {
1010                 *count = le32_to_cpu(sts->ulAmountInOutQueue);
1011                 result = 0;
1012         } else {
1013                 dev_err(&port->dev, "failed to get comm status: %d\n", result);
1014                 if (result >= 0)
1015                         result = -EIO;
1016         }
1017
1018         kfree(sts);
1019
1020         return result;
1021 }
1022
1023 static bool cp210x_tx_empty(struct usb_serial_port *port)
1024 {
1025         int err;
1026         u32 count;
1027
1028         err = cp210x_get_tx_queue_byte_count(port, &count);
1029         if (err)
1030                 return true;
1031
1032         return !count;
1033 }
1034
1035 /*
1036  * cp210x_get_termios
1037  * Reads the baud rate, data bits, parity, stop bits and flow control mode
1038  * from the device, corrects any unsupported values, and configures the
1039  * termios structure to reflect the state of the device
1040  */
1041 static void cp210x_get_termios(struct tty_struct *tty,
1042         struct usb_serial_port *port)
1043 {
1044         unsigned int baud;
1045
1046         if (tty) {
1047                 cp210x_get_termios_port(tty->driver_data,
1048                         &tty->termios.c_cflag, &baud);
1049                 tty_encode_baud_rate(tty, baud, baud);
1050         } else {
1051                 tcflag_t cflag;
1052                 cflag = 0;
1053                 cp210x_get_termios_port(port, &cflag, &baud);
1054         }
1055 }
1056
1057 /*
1058  * cp210x_get_termios_port
1059  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
1060  */
1061 static void cp210x_get_termios_port(struct usb_serial_port *port,
1062         tcflag_t *cflagp, unsigned int *baudp)
1063 {
1064         struct device *dev = &port->dev;
1065         tcflag_t cflag;
1066         struct cp210x_flow_ctl flow_ctl;
1067         u32 baud;
1068         u16 bits;
1069         u32 ctl_hs;
1070         u32 flow_repl;
1071
1072         cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
1073
1074         dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
1075         *baudp = baud;
1076
1077         cflag = *cflagp;
1078
1079         cp210x_get_line_ctl(port, &bits);
1080         cflag &= ~CSIZE;
1081         switch (bits & BITS_DATA_MASK) {
1082         case BITS_DATA_5:
1083                 dev_dbg(dev, "%s - data bits = 5\n", __func__);
1084                 cflag |= CS5;
1085                 break;
1086         case BITS_DATA_6:
1087                 dev_dbg(dev, "%s - data bits = 6\n", __func__);
1088                 cflag |= CS6;
1089                 break;
1090         case BITS_DATA_7:
1091                 dev_dbg(dev, "%s - data bits = 7\n", __func__);
1092                 cflag |= CS7;
1093                 break;
1094         case BITS_DATA_8:
1095                 dev_dbg(dev, "%s - data bits = 8\n", __func__);
1096                 cflag |= CS8;
1097                 break;
1098         case BITS_DATA_9:
1099                 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
1100                 cflag |= CS8;
1101                 bits &= ~BITS_DATA_MASK;
1102                 bits |= BITS_DATA_8;
1103                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1104                 break;
1105         default:
1106                 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
1107                 cflag |= CS8;
1108                 bits &= ~BITS_DATA_MASK;
1109                 bits |= BITS_DATA_8;
1110                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1111                 break;
1112         }
1113
1114         switch (bits & BITS_PARITY_MASK) {
1115         case BITS_PARITY_NONE:
1116                 dev_dbg(dev, "%s - parity = NONE\n", __func__);
1117                 cflag &= ~PARENB;
1118                 break;
1119         case BITS_PARITY_ODD:
1120                 dev_dbg(dev, "%s - parity = ODD\n", __func__);
1121                 cflag |= (PARENB|PARODD);
1122                 break;
1123         case BITS_PARITY_EVEN:
1124                 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
1125                 cflag &= ~PARODD;
1126                 cflag |= PARENB;
1127                 break;
1128         case BITS_PARITY_MARK:
1129                 dev_dbg(dev, "%s - parity = MARK\n", __func__);
1130                 cflag |= (PARENB|PARODD|CMSPAR);
1131                 break;
1132         case BITS_PARITY_SPACE:
1133                 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1134                 cflag &= ~PARODD;
1135                 cflag |= (PARENB|CMSPAR);
1136                 break;
1137         default:
1138                 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
1139                 cflag &= ~PARENB;
1140                 bits &= ~BITS_PARITY_MASK;
1141                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1142                 break;
1143         }
1144
1145         cflag &= ~CSTOPB;
1146         switch (bits & BITS_STOP_MASK) {
1147         case BITS_STOP_1:
1148                 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1149                 break;
1150         case BITS_STOP_1_5:
1151                 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
1152                 bits &= ~BITS_STOP_MASK;
1153                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1154                 break;
1155         case BITS_STOP_2:
1156                 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1157                 cflag |= CSTOPB;
1158                 break;
1159         default:
1160                 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
1161                 bits &= ~BITS_STOP_MASK;
1162                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1163                 break;
1164         }
1165
1166         cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1167                         sizeof(flow_ctl));
1168         ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1169         if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
1170                 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1171                 /*
1172                  * When the port is closed, the CP210x hardware disables
1173                  * auto-RTS and RTS is deasserted but it leaves auto-CTS when
1174                  * in hardware flow control mode. When re-opening the port, if
1175                  * auto-CTS is enabled on the cp210x, then auto-RTS must be
1176                  * re-enabled in the driver.
1177                  */
1178                 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1179                 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1180                 flow_repl |= CP210X_SERIAL_RTS_SHIFT(CP210X_SERIAL_RTS_FLOW_CTL);
1181                 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1182                 cp210x_write_reg_block(port,
1183                                 CP210X_SET_FLOW,
1184                                 &flow_ctl,
1185                                 sizeof(flow_ctl));
1186
1187                 cflag |= CRTSCTS;
1188         } else {
1189                 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1190                 cflag &= ~CRTSCTS;
1191         }
1192
1193         *cflagp = cflag;
1194 }
1195
1196 struct cp210x_rate {
1197         speed_t rate;
1198         speed_t high;
1199 };
1200
1201 static const struct cp210x_rate cp210x_an205_table1[] = {
1202         { 300, 300 },
1203         { 600, 600 },
1204         { 1200, 1200 },
1205         { 1800, 1800 },
1206         { 2400, 2400 },
1207         { 4000, 4000 },
1208         { 4800, 4803 },
1209         { 7200, 7207 },
1210         { 9600, 9612 },
1211         { 14400, 14428 },
1212         { 16000, 16062 },
1213         { 19200, 19250 },
1214         { 28800, 28912 },
1215         { 38400, 38601 },
1216         { 51200, 51558 },
1217         { 56000, 56280 },
1218         { 57600, 58053 },
1219         { 64000, 64111 },
1220         { 76800, 77608 },
1221         { 115200, 117028 },
1222         { 128000, 129347 },
1223         { 153600, 156868 },
1224         { 230400, 237832 },
1225         { 250000, 254234 },
1226         { 256000, 273066 },
1227         { 460800, 491520 },
1228         { 500000, 567138 },
1229         { 576000, 670254 },
1230         { 921600, UINT_MAX }
1231 };
1232
1233 /*
1234  * Quantises the baud rate as per AN205 Table 1
1235  */
1236 static speed_t cp210x_get_an205_rate(speed_t baud)
1237 {
1238         int i;
1239
1240         for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) {
1241                 if (baud <= cp210x_an205_table1[i].high)
1242                         break;
1243         }
1244
1245         return cp210x_an205_table1[i].rate;
1246 }
1247
1248 static speed_t cp210x_get_actual_rate(speed_t baud)
1249 {
1250         unsigned int prescale = 1;
1251         unsigned int div;
1252
1253         if (baud <= 365)
1254                 prescale = 4;
1255
1256         div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud);
1257         baud = 48000000 / (2 * prescale * div);
1258
1259         return baud;
1260 }
1261
1262 /*
1263  * CP2101 supports the following baud rates:
1264  *
1265  *      300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1266  *      38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1267  *
1268  * CP2102 and CP2103 support the following additional rates:
1269  *
1270  *      4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1271  *      576000
1272  *
1273  * The device will map a requested rate to a supported one, but the result
1274  * of requests for rates greater than 1053257 is undefined (see AN205).
1275  *
1276  * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1277  * respectively, with an error less than 1%. The actual rates are determined
1278  * by
1279  *
1280  *      div = round(freq / (2 x prescale x request))
1281  *      actual = freq / (2 x prescale x div)
1282  *
1283  * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1284  * or 1 otherwise.
1285  * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1286  * otherwise.
1287  */
1288 static void cp210x_change_speed(struct tty_struct *tty,
1289                 struct usb_serial_port *port, struct ktermios *old_termios)
1290 {
1291         struct usb_serial *serial = port->serial;
1292         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1293         u32 baud;
1294
1295         /*
1296          * This maps the requested rate to the actual rate, a valid rate on
1297          * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed].
1298          *
1299          * NOTE: B0 is not implemented.
1300          */
1301         baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed);
1302
1303         if (priv->use_actual_rate)
1304                 baud = cp210x_get_actual_rate(baud);
1305         else if (baud < 1000000)
1306                 baud = cp210x_get_an205_rate(baud);
1307
1308         dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1309         if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1310                 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1311                 if (old_termios)
1312                         baud = old_termios->c_ospeed;
1313                 else
1314                         baud = 9600;
1315         }
1316
1317         tty_encode_baud_rate(tty, baud, baud);
1318 }
1319
1320 static void cp210x_enable_event_mode(struct usb_serial_port *port)
1321 {
1322         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1323         int ret;
1324
1325         if (port_priv->event_mode)
1326                 return;
1327
1328         port_priv->event_state = ES_DATA;
1329         port_priv->event_mode = true;
1330
1331         ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR);
1332         if (ret) {
1333                 dev_err(&port->dev, "failed to enable events: %d\n", ret);
1334                 port_priv->event_mode = false;
1335         }
1336 }
1337
1338 static void cp210x_disable_event_mode(struct usb_serial_port *port)
1339 {
1340         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1341         int ret;
1342
1343         if (!port_priv->event_mode)
1344                 return;
1345
1346         ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0);
1347         if (ret) {
1348                 dev_err(&port->dev, "failed to disable events: %d\n", ret);
1349                 return;
1350         }
1351
1352         port_priv->event_mode = false;
1353 }
1354
1355 static void cp210x_set_termios(struct tty_struct *tty,
1356                 struct usb_serial_port *port, struct ktermios *old_termios)
1357 {
1358         struct device *dev = &port->dev;
1359         unsigned int cflag, old_cflag;
1360         u16 bits;
1361
1362         cflag = tty->termios.c_cflag;
1363         old_cflag = old_termios->c_cflag;
1364
1365         if (tty->termios.c_ospeed != old_termios->c_ospeed)
1366                 cp210x_change_speed(tty, port, old_termios);
1367
1368         /* If the number of data bits is to be updated */
1369         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
1370                 cp210x_get_line_ctl(port, &bits);
1371                 bits &= ~BITS_DATA_MASK;
1372                 switch (cflag & CSIZE) {
1373                 case CS5:
1374                         bits |= BITS_DATA_5;
1375                         dev_dbg(dev, "%s - data bits = 5\n", __func__);
1376                         break;
1377                 case CS6:
1378                         bits |= BITS_DATA_6;
1379                         dev_dbg(dev, "%s - data bits = 6\n", __func__);
1380                         break;
1381                 case CS7:
1382                         bits |= BITS_DATA_7;
1383                         dev_dbg(dev, "%s - data bits = 7\n", __func__);
1384                         break;
1385                 case CS8:
1386                 default:
1387                         bits |= BITS_DATA_8;
1388                         dev_dbg(dev, "%s - data bits = 8\n", __func__);
1389                         break;
1390                 }
1391                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1392                         dev_dbg(dev, "Number of data bits requested not supported by device\n");
1393         }
1394
1395         if ((cflag     & (PARENB|PARODD|CMSPAR)) !=
1396             (old_cflag & (PARENB|PARODD|CMSPAR))) {
1397                 cp210x_get_line_ctl(port, &bits);
1398                 bits &= ~BITS_PARITY_MASK;
1399                 if (cflag & PARENB) {
1400                         if (cflag & CMSPAR) {
1401                                 if (cflag & PARODD) {
1402                                         bits |= BITS_PARITY_MARK;
1403                                         dev_dbg(dev, "%s - parity = MARK\n", __func__);
1404                                 } else {
1405                                         bits |= BITS_PARITY_SPACE;
1406                                         dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1407                                 }
1408                         } else {
1409                                 if (cflag & PARODD) {
1410                                         bits |= BITS_PARITY_ODD;
1411                                         dev_dbg(dev, "%s - parity = ODD\n", __func__);
1412                                 } else {
1413                                         bits |= BITS_PARITY_EVEN;
1414                                         dev_dbg(dev, "%s - parity = EVEN\n", __func__);
1415                                 }
1416                         }
1417                 }
1418                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1419                         dev_dbg(dev, "Parity mode not supported by device\n");
1420         }
1421
1422         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
1423                 cp210x_get_line_ctl(port, &bits);
1424                 bits &= ~BITS_STOP_MASK;
1425                 if (cflag & CSTOPB) {
1426                         bits |= BITS_STOP_2;
1427                         dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1428                 } else {
1429                         bits |= BITS_STOP_1;
1430                         dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1431                 }
1432                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1433                         dev_dbg(dev, "Number of stop bits requested not supported by device\n");
1434         }
1435
1436         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
1437                 struct cp210x_flow_ctl flow_ctl;
1438                 u32 ctl_hs;
1439                 u32 flow_repl;
1440
1441                 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1442                                 sizeof(flow_ctl));
1443                 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1444                 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1445                 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1446                                 __func__, ctl_hs, flow_repl);
1447
1448                 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1449                 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1450                 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1451                 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1452                 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1453                 if (cflag & CRTSCTS) {
1454                         ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1455
1456                         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1457                         flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1458                                         CP210X_SERIAL_RTS_FLOW_CTL);
1459                         dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1460                 } else {
1461                         ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1462
1463                         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1464                         flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1465                                         CP210X_SERIAL_RTS_ACTIVE);
1466                         dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1467                 }
1468
1469                 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1470                                 __func__, ctl_hs, flow_repl);
1471                 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1472                 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1473                 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1474                                 sizeof(flow_ctl));
1475         }
1476
1477         /*
1478          * Enable event-insertion mode only if input parity checking is
1479          * enabled for now.
1480          */
1481         if (I_INPCK(tty))
1482                 cp210x_enable_event_mode(port);
1483         else
1484                 cp210x_disable_event_mode(port);
1485 }
1486
1487 static int cp210x_tiocmset(struct tty_struct *tty,
1488                 unsigned int set, unsigned int clear)
1489 {
1490         struct usb_serial_port *port = tty->driver_data;
1491         return cp210x_tiocmset_port(port, set, clear);
1492 }
1493
1494 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1495                 unsigned int set, unsigned int clear)
1496 {
1497         u16 control = 0;
1498
1499         if (set & TIOCM_RTS) {
1500                 control |= CONTROL_RTS;
1501                 control |= CONTROL_WRITE_RTS;
1502         }
1503         if (set & TIOCM_DTR) {
1504                 control |= CONTROL_DTR;
1505                 control |= CONTROL_WRITE_DTR;
1506         }
1507         if (clear & TIOCM_RTS) {
1508                 control &= ~CONTROL_RTS;
1509                 control |= CONTROL_WRITE_RTS;
1510         }
1511         if (clear & TIOCM_DTR) {
1512                 control &= ~CONTROL_DTR;
1513                 control |= CONTROL_WRITE_DTR;
1514         }
1515
1516         dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1517
1518         return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1519 }
1520
1521 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1522 {
1523         if (on)
1524                 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1525         else
1526                 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1527 }
1528
1529 static int cp210x_tiocmget(struct tty_struct *tty)
1530 {
1531         struct usb_serial_port *port = tty->driver_data;
1532         u8 control;
1533         int result;
1534
1535         result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1536         if (result)
1537                 return result;
1538
1539         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1540                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1541                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1542                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1543                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
1544                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
1545
1546         dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1547
1548         return result;
1549 }
1550
1551 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1552 {
1553         struct usb_serial_port *port = tty->driver_data;
1554         u16 state;
1555
1556         if (break_state == 0)
1557                 state = BREAK_OFF;
1558         else
1559                 state = BREAK_ON;
1560         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1561                 state == BREAK_OFF ? "off" : "on");
1562         cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1563 }
1564
1565 #ifdef CONFIG_GPIOLIB
1566 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset)
1567 {
1568         struct usb_serial *serial = gpiochip_get_data(gc);
1569         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1570
1571         if (priv->gpio_altfunc & BIT(offset))
1572                 return -ENODEV;
1573
1574         return 0;
1575 }
1576
1577 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1578 {
1579         struct usb_serial *serial = gpiochip_get_data(gc);
1580         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1581         u8 req_type = REQTYPE_DEVICE_TO_HOST;
1582         int result;
1583         u8 buf;
1584
1585         if (priv->partnum == CP210X_PARTNUM_CP2105)
1586                 req_type = REQTYPE_INTERFACE_TO_HOST;
1587
1588         result = usb_autopm_get_interface(serial->interface);
1589         if (result)
1590                 return result;
1591
1592         result = cp210x_read_vendor_block(serial, req_type,
1593                                           CP210X_READ_LATCH, &buf, sizeof(buf));
1594         usb_autopm_put_interface(serial->interface);
1595         if (result < 0)
1596                 return result;
1597
1598         return !!(buf & BIT(gpio));
1599 }
1600
1601 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1602 {
1603         struct usb_serial *serial = gpiochip_get_data(gc);
1604         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1605         struct cp210x_gpio_write buf;
1606         int result;
1607
1608         if (value == 1)
1609                 buf.state = BIT(gpio);
1610         else
1611                 buf.state = 0;
1612
1613         buf.mask = BIT(gpio);
1614
1615         result = usb_autopm_get_interface(serial->interface);
1616         if (result)
1617                 goto out;
1618
1619         if (priv->partnum == CP210X_PARTNUM_CP2105) {
1620                 result = cp210x_write_vendor_block(serial,
1621                                                    REQTYPE_HOST_TO_INTERFACE,
1622                                                    CP210X_WRITE_LATCH, &buf,
1623                                                    sizeof(buf));
1624         } else {
1625                 u16 wIndex = buf.state << 8 | buf.mask;
1626
1627                 result = usb_control_msg(serial->dev,
1628                                          usb_sndctrlpipe(serial->dev, 0),
1629                                          CP210X_VENDOR_SPECIFIC,
1630                                          REQTYPE_HOST_TO_DEVICE,
1631                                          CP210X_WRITE_LATCH,
1632                                          wIndex,
1633                                          NULL, 0, USB_CTRL_SET_TIMEOUT);
1634         }
1635
1636         usb_autopm_put_interface(serial->interface);
1637 out:
1638         if (result < 0) {
1639                 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n",
1640                                 result);
1641         }
1642 }
1643
1644 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1645 {
1646         struct usb_serial *serial = gpiochip_get_data(gc);
1647         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1648
1649         return priv->gpio_input & BIT(gpio);
1650 }
1651
1652 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1653 {
1654         struct usb_serial *serial = gpiochip_get_data(gc);
1655         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1656
1657         if (priv->partnum == CP210X_PARTNUM_CP2105) {
1658                 /* hardware does not support an input mode */
1659                 return -ENOTSUPP;
1660         }
1661
1662         /* push-pull pins cannot be changed to be inputs */
1663         if (priv->gpio_pushpull & BIT(gpio))
1664                 return -EINVAL;
1665
1666         /* make sure to release pin if it is being driven low */
1667         cp210x_gpio_set(gc, gpio, 1);
1668
1669         priv->gpio_input |= BIT(gpio);
1670
1671         return 0;
1672 }
1673
1674 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1675                                         int value)
1676 {
1677         struct usb_serial *serial = gpiochip_get_data(gc);
1678         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1679
1680         priv->gpio_input &= ~BIT(gpio);
1681         cp210x_gpio_set(gc, gpio, value);
1682
1683         return 0;
1684 }
1685
1686 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1687                                   unsigned long config)
1688 {
1689         struct usb_serial *serial = gpiochip_get_data(gc);
1690         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1691         enum pin_config_param param = pinconf_to_config_param(config);
1692
1693         /* Succeed only if in correct mode (this can't be set at runtime) */
1694         if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1695             (priv->gpio_pushpull & BIT(gpio)))
1696                 return 0;
1697
1698         if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1699             !(priv->gpio_pushpull & BIT(gpio)))
1700                 return 0;
1701
1702         return -ENOTSUPP;
1703 }
1704
1705 /*
1706  * This function is for configuring GPIO using shared pins, where other signals
1707  * are made unavailable by configuring the use of GPIO. This is believed to be
1708  * only applicable to the cp2105 at this point, the other devices supported by
1709  * this driver that provide GPIO do so in a way that does not impact other
1710  * signals and are thus expected to have very different initialisation.
1711  */
1712 static int cp2105_gpioconf_init(struct usb_serial *serial)
1713 {
1714         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1715         struct cp210x_pin_mode mode;
1716         struct cp210x_dual_port_config config;
1717         u8 intf_num = cp210x_interface_num(serial);
1718         u8 iface_config;
1719         int result;
1720
1721         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1722                                           CP210X_GET_DEVICEMODE, &mode,
1723                                           sizeof(mode));
1724         if (result < 0)
1725                 return result;
1726
1727         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1728                                           CP210X_GET_PORTCONFIG, &config,
1729                                           sizeof(config));
1730         if (result < 0)
1731                 return result;
1732
1733         /*  2 banks of GPIO - One for the pins taken from each serial port */
1734         if (intf_num == 0) {
1735                 if (mode.eci == CP210X_PIN_MODE_MODEM) {
1736                         /* mark all GPIOs of this interface as reserved */
1737                         priv->gpio_altfunc = 0xff;
1738                         return 0;
1739                 }
1740
1741                 iface_config = config.eci_cfg;
1742                 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1743                                                 CP210X_ECI_GPIO_MODE_MASK) >>
1744                                                 CP210X_ECI_GPIO_MODE_OFFSET);
1745                 priv->gc.ngpio = 2;
1746         } else if (intf_num == 1) {
1747                 if (mode.sci == CP210X_PIN_MODE_MODEM) {
1748                         /* mark all GPIOs of this interface as reserved */
1749                         priv->gpio_altfunc = 0xff;
1750                         return 0;
1751                 }
1752
1753                 iface_config = config.sci_cfg;
1754                 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1755                                                 CP210X_SCI_GPIO_MODE_MASK) >>
1756                                                 CP210X_SCI_GPIO_MODE_OFFSET);
1757                 priv->gc.ngpio = 3;
1758         } else {
1759                 return -ENODEV;
1760         }
1761
1762         /* mark all pins which are not in GPIO mode */
1763         if (iface_config & CP2105_GPIO0_TXLED_MODE)     /* GPIO 0 */
1764                 priv->gpio_altfunc |= BIT(0);
1765         if (iface_config & (CP2105_GPIO1_RXLED_MODE |   /* GPIO 1 */
1766                         CP2105_GPIO1_RS485_MODE))
1767                 priv->gpio_altfunc |= BIT(1);
1768
1769         /* driver implementation for CP2105 only supports outputs */
1770         priv->gpio_input = 0;
1771
1772         return 0;
1773 }
1774
1775 static int cp2104_gpioconf_init(struct usb_serial *serial)
1776 {
1777         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1778         struct cp210x_single_port_config config;
1779         u8 iface_config;
1780         u8 gpio_latch;
1781         int result;
1782         u8 i;
1783
1784         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1785                                           CP210X_GET_PORTCONFIG, &config,
1786                                           sizeof(config));
1787         if (result < 0)
1788                 return result;
1789
1790         priv->gc.ngpio = 4;
1791
1792         iface_config = config.device_cfg;
1793         priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1794                                         CP210X_GPIO_MODE_MASK) >>
1795                                         CP210X_GPIO_MODE_OFFSET);
1796         gpio_latch = (u8)((le16_to_cpu(config.reset_state) &
1797                                         CP210X_GPIO_MODE_MASK) >>
1798                                         CP210X_GPIO_MODE_OFFSET);
1799
1800         /* mark all pins which are not in GPIO mode */
1801         if (iface_config & CP2104_GPIO0_TXLED_MODE)     /* GPIO 0 */
1802                 priv->gpio_altfunc |= BIT(0);
1803         if (iface_config & CP2104_GPIO1_RXLED_MODE)     /* GPIO 1 */
1804                 priv->gpio_altfunc |= BIT(1);
1805         if (iface_config & CP2104_GPIO2_RS485_MODE)     /* GPIO 2 */
1806                 priv->gpio_altfunc |= BIT(2);
1807
1808         /*
1809          * Like CP2102N, CP2104 has also no strict input and output pin
1810          * modes.
1811          * Do the same input mode emulation as CP2102N.
1812          */
1813         for (i = 0; i < priv->gc.ngpio; ++i) {
1814                 /*
1815                  * Set direction to "input" iff pin is open-drain and reset
1816                  * value is 1.
1817                  */
1818                 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1819                         priv->gpio_input |= BIT(i);
1820         }
1821
1822         return 0;
1823 }
1824
1825 static int cp2102n_gpioconf_init(struct usb_serial *serial)
1826 {
1827         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1828         const u16 config_size = 0x02a6;
1829         u8 gpio_rst_latch;
1830         u8 config_version;
1831         u8 gpio_pushpull;
1832         u8 *config_buf;
1833         u8 gpio_latch;
1834         u8 gpio_ctrl;
1835         int result;
1836         u8 i;
1837
1838         /*
1839          * Retrieve device configuration from the device.
1840          * The array received contains all customization settings done at the
1841          * factory/manufacturer. Format of the array is documented at the
1842          * time of writing at:
1843          * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa
1844          */
1845         config_buf = kmalloc(config_size, GFP_KERNEL);
1846         if (!config_buf)
1847                 return -ENOMEM;
1848
1849         result = cp210x_read_vendor_block(serial,
1850                                           REQTYPE_DEVICE_TO_HOST,
1851                                           CP210X_READ_2NCONFIG,
1852                                           config_buf,
1853                                           config_size);
1854         if (result < 0) {
1855                 kfree(config_buf);
1856                 return result;
1857         }
1858
1859         config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX];
1860         gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX];
1861         gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX];
1862         gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX];
1863
1864         kfree(config_buf);
1865
1866         /* Make sure this is a config format we understand. */
1867         if (config_version != 0x01)
1868                 return -ENOTSUPP;
1869
1870         priv->gc.ngpio = 4;
1871
1872         /*
1873          * Get default pin states after reset. Needed so we can determine
1874          * the direction of an open-drain pin.
1875          */
1876         gpio_latch = (gpio_rst_latch >> 3) & 0x0f;
1877
1878         /* 0 indicates open-drain mode, 1 is push-pull */
1879         priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f;
1880
1881         /* 0 indicates GPIO mode, 1 is alternate function */
1882         priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f;
1883
1884         if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) {
1885                 /*
1886                  * For the QFN28 package, GPIO4-6 are controlled by
1887                  * the low three bits of the mode/latch fields.
1888                  * Contrary to the document linked above, the bits for
1889                  * the SUSPEND pins are elsewhere.  No alternate
1890                  * function is available for these pins.
1891                  */
1892                 priv->gc.ngpio = 7;
1893                 gpio_latch |= (gpio_rst_latch & 7) << 4;
1894                 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4;
1895         }
1896
1897         /*
1898          * The CP2102N does not strictly has input and output pin modes,
1899          * it only knows open-drain and push-pull modes which is set at
1900          * factory. An open-drain pin can function both as an
1901          * input or an output. We emulate input mode for open-drain pins
1902          * by making sure they are not driven low, and we do not allow
1903          * push-pull pins to be set as an input.
1904          */
1905         for (i = 0; i < priv->gc.ngpio; ++i) {
1906                 /*
1907                  * Set direction to "input" iff pin is open-drain and reset
1908                  * value is 1.
1909                  */
1910                 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1911                         priv->gpio_input |= BIT(i);
1912         }
1913
1914         return 0;
1915 }
1916
1917 static int cp210x_gpio_init(struct usb_serial *serial)
1918 {
1919         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1920         int result;
1921
1922         switch (priv->partnum) {
1923         case CP210X_PARTNUM_CP2104:
1924                 result = cp2104_gpioconf_init(serial);
1925                 break;
1926         case CP210X_PARTNUM_CP2105:
1927                 result = cp2105_gpioconf_init(serial);
1928                 break;
1929         case CP210X_PARTNUM_CP2102N_QFN28:
1930         case CP210X_PARTNUM_CP2102N_QFN24:
1931         case CP210X_PARTNUM_CP2102N_QFN20:
1932                 result = cp2102n_gpioconf_init(serial);
1933                 break;
1934         default:
1935                 return 0;
1936         }
1937
1938         if (result < 0)
1939                 return result;
1940
1941         priv->gc.label = "cp210x";
1942         priv->gc.request = cp210x_gpio_request;
1943         priv->gc.get_direction = cp210x_gpio_direction_get;
1944         priv->gc.direction_input = cp210x_gpio_direction_input;
1945         priv->gc.direction_output = cp210x_gpio_direction_output;
1946         priv->gc.get = cp210x_gpio_get;
1947         priv->gc.set = cp210x_gpio_set;
1948         priv->gc.set_config = cp210x_gpio_set_config;
1949         priv->gc.owner = THIS_MODULE;
1950         priv->gc.parent = &serial->interface->dev;
1951         priv->gc.base = -1;
1952         priv->gc.can_sleep = true;
1953
1954         result = gpiochip_add_data(&priv->gc, serial);
1955         if (!result)
1956                 priv->gpio_registered = true;
1957
1958         return result;
1959 }
1960
1961 static void cp210x_gpio_remove(struct usb_serial *serial)
1962 {
1963         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1964
1965         if (priv->gpio_registered) {
1966                 gpiochip_remove(&priv->gc);
1967                 priv->gpio_registered = false;
1968         }
1969 }
1970
1971 #else
1972
1973 static int cp210x_gpio_init(struct usb_serial *serial)
1974 {
1975         return 0;
1976 }
1977
1978 static void cp210x_gpio_remove(struct usb_serial *serial)
1979 {
1980         /* Nothing to do */
1981 }
1982
1983 #endif
1984
1985 static int cp210x_port_probe(struct usb_serial_port *port)
1986 {
1987         struct usb_serial *serial = port->serial;
1988         struct cp210x_port_private *port_priv;
1989         int ret;
1990
1991         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1992         if (!port_priv)
1993                 return -ENOMEM;
1994
1995         port_priv->bInterfaceNumber = cp210x_interface_num(serial);
1996
1997         usb_set_serial_port_data(port, port_priv);
1998
1999         ret = cp210x_detect_swapped_line_ctl(port);
2000         if (ret) {
2001                 kfree(port_priv);
2002                 return ret;
2003         }
2004
2005         return 0;
2006 }
2007
2008 static int cp210x_port_remove(struct usb_serial_port *port)
2009 {
2010         struct cp210x_port_private *port_priv;
2011
2012         port_priv = usb_get_serial_port_data(port);
2013         kfree(port_priv);
2014
2015         return 0;
2016 }
2017
2018 static void cp210x_init_max_speed(struct usb_serial *serial)
2019 {
2020         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2021         bool use_actual_rate = false;
2022         speed_t min = 300;
2023         speed_t max;
2024
2025         switch (priv->partnum) {
2026         case CP210X_PARTNUM_CP2101:
2027                 max = 921600;
2028                 break;
2029         case CP210X_PARTNUM_CP2102:
2030         case CP210X_PARTNUM_CP2103:
2031                 max = 1000000;
2032                 break;
2033         case CP210X_PARTNUM_CP2104:
2034                 use_actual_rate = true;
2035                 max = 2000000;
2036                 break;
2037         case CP210X_PARTNUM_CP2108:
2038                 max = 2000000;
2039                 break;
2040         case CP210X_PARTNUM_CP2105:
2041                 if (cp210x_interface_num(serial) == 0) {
2042                         use_actual_rate = true;
2043                         max = 2000000;  /* ECI */
2044                 } else {
2045                         min = 2400;
2046                         max = 921600;   /* SCI */
2047                 }
2048                 break;
2049         case CP210X_PARTNUM_CP2102N_QFN28:
2050         case CP210X_PARTNUM_CP2102N_QFN24:
2051         case CP210X_PARTNUM_CP2102N_QFN20:
2052                 use_actual_rate = true;
2053                 max = 3000000;
2054                 break;
2055         default:
2056                 max = 2000000;
2057                 break;
2058         }
2059
2060         priv->min_speed = min;
2061         priv->max_speed = max;
2062         priv->use_actual_rate = use_actual_rate;
2063 }
2064
2065 static int cp210x_attach(struct usb_serial *serial)
2066 {
2067         int result;
2068         struct cp210x_serial_private *priv;
2069
2070         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2071         if (!priv)
2072                 return -ENOMEM;
2073
2074         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
2075                                           CP210X_GET_PARTNUM, &priv->partnum,
2076                                           sizeof(priv->partnum));
2077         if (result < 0) {
2078                 dev_warn(&serial->interface->dev,
2079                          "querying part number failed\n");
2080                 priv->partnum = CP210X_PARTNUM_UNKNOWN;
2081         }
2082
2083         usb_set_serial_data(serial, priv);
2084
2085         cp210x_init_max_speed(serial);
2086
2087         result = cp210x_gpio_init(serial);
2088         if (result < 0) {
2089                 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n",
2090                                 result);
2091         }
2092
2093         return 0;
2094 }
2095
2096 static void cp210x_disconnect(struct usb_serial *serial)
2097 {
2098         cp210x_gpio_remove(serial);
2099 }
2100
2101 static void cp210x_release(struct usb_serial *serial)
2102 {
2103         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2104
2105         cp210x_gpio_remove(serial);
2106
2107         kfree(priv);
2108 }
2109
2110 module_usb_serial_driver(serial_drivers, id_table);
2111
2112 MODULE_DESCRIPTION(DRIVER_DESC);
2113 MODULE_LICENSE("GPL v2");