drivers/usb/serial/cp210x.c

   1 /*
   2  * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
   3  *
   4  * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License version
   8  *      2 as published by the Free Software Foundation.
   9  *
  10  * Support to set flow control line levels using TIOCMGET and TIOCMSET
  11  * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
  12  * control thanks to Munir Nassar nassarmu@real-time.com
  13  *
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/errno.h>
  18 #include <linux/slab.h>
  19 #include <linux/tty.h>
  20 #include <linux/tty_flip.h>
  21 #include <linux/module.h>
  22 #include <linux/moduleparam.h>
  23 #include <linux/usb.h>
  24 #include <linux/uaccess.h>
  25 #include <linux/usb/serial.h>
  26 #include <linux/gpio/driver.h>
  27 #include <linux/bitops.h>
  28 #include <linux/mutex.h>
  29
  30 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
  31
  32 /*
  33  * Function Prototypes
  34  */
  35 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
  36 static void cp210x_close(struct usb_serial_port *);
  37 static void cp210x_get_termios(struct tty_struct *, struct usb_serial_port *);
  38 static void cp210x_get_termios_port(struct usb_serial_port *port,
  39         tcflag_t *cflagp, unsigned int *baudp);
  40 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
  41                                                         struct ktermios *);
  42 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
  43                                                         struct ktermios*);
  44 static bool cp210x_tx_empty(struct usb_serial_port *port);
  45 static int cp210x_tiocmget(struct tty_struct *);
  46 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
  47 static int cp210x_tiocmset_port(struct usb_serial_port *port,
  48                 unsigned int, unsigned int);
  49 static void cp210x_break_ctl(struct tty_struct *, int);
  50 static int cp210x_attach(struct usb_serial *);
  51 static void cp210x_disconnect(struct usb_serial *);
  52 static void cp210x_release(struct usb_serial *);
  53 static int cp210x_port_probe(struct usb_serial_port *);
  54 static int cp210x_port_remove(struct usb_serial_port *);
  55 static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
  56
  57 static const struct usb_device_id id_table[] = {
  58         { USB_DEVICE(0x0404, 0x034C) }, /* NCR Retail IO Box */
  59         { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
  60         { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
  61         { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  62         { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  63         { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
  64         { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
  65         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
  66         { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
  67         { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
  68         { USB_DEVICE(0x0988, 0x0578) }, /* Teraoka AD2000 */
  69         { USB_DEVICE(0x0B00, 0x3070) }, /* Ingenico 3070 */
  70         { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
  71         { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
  72         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  73         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
  74         { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
  75         { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
  76         { USB_DEVICE(0x106F, 0x0003) }, /* CPI / Money Controls Bulk Coin Recycler */
  77         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  78         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  79         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  80         { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
  81         { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
  82         { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
  83         { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
  84         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  85         { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
  86         { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
  87         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
  88         { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
  89         { USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */
  90         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  91         { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
  92         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  93         { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
  94         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  95         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
  96         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  97         { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
  98         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  99         { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
 100         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
 101         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
 102         { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
 103         { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
 104         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
 105         { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
 106         { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */
 107         { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */
 108         { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */
 109         { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
 110         { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
 111         { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
 112         { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
 113         { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
 114         { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
 115         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
 116         { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
 117         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
 118         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
 119         { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
 120         { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
 121         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
 122         { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
 123         { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
 124         { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
 125         { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
 126         { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */
 127         { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */
 128         { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */
 129         { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
 130         { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
 131         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
 132         { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
 133         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
 134         { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */
 135         { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
 136         { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
 137         { USB_DEVICE(0x10C4, 0x8414) }, /* Decagon USB Cable Adapter */
 138         { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
 139         { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
 140         { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
 141         { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
 142         { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
 143         { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */
 144         { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */
 145         { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */
 146         { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
 147         { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
 148         { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
 149         { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
 150         { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
 151         { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
 152         { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
 153         { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
 154         { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
 155         { USB_DEVICE(0x10C4, 0x88D8) }, /* Acuity Brands nLight Air Adapter */
 156         { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */
 157         { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */
 158         { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
 159         { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
 160         { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
 161         { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
 162         { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */
 163         { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */
 164         { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
 165         { USB_DEVICE(0x10C4, 0x8A5B) }, /* CEL EM3588 ZigBee USB Stick */
 166         { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
 167         { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
 168         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 169         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 170         { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */
 171         { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
 172         { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
 173         { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */
 174         { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */
 175         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 176         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 177         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 178         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 179         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 180         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 181         { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
 182         { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
 183         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 184         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 185         { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */
 186         { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
 187         { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
 188         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 189         { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
 190         { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
 191         { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
 192         { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
 193         { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
 194         { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
 195         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 196         { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
 197         { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
 198         { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
 199         { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
 200         { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
 201         { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
 202         { USB_DEVICE(0x17A8, 0x0011) }, /* Kamstrup 444 MHz RF sniffer */
 203         { USB_DEVICE(0x17A8, 0x0013) }, /* Kamstrup 870 MHz RF sniffer */
 204         { USB_DEVICE(0x17A8, 0x0101) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Int Ant) */
 205         { USB_DEVICE(0x17A8, 0x0102) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Ext Ant) */
 206         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
 207         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
 208         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 209         { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
 210         { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
 211         { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
 212         { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
 213         { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
 214         { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
 215         { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
 216         { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
 217         { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 M.2 Key E serial interface */
 218         { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 Display serial interface */
 219         { USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */
 220         { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
 221         { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
 222         { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
 223         { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
 224         { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
 225         { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
 226         { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
 227         { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
 228         { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
 229         { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
 230         { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
 231         { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
 232         { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
 233         { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
 234         { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
 235         { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
 236         { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
 237         { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
 238         { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
 239         { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
 240         { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
 241         { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
 242         { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
 243         { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
 244         { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
 245         { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
 246         { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
 247         { USB_DEVICE(0x2184, 0x0030) }, /* GW Instek GDM-834x Digital Multimeter */
 248         { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
 249         { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
 250         { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
 251         { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
 252         { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
 253         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 254         { } /* Terminating Entry */
 255 };
 256
 257 MODULE_DEVICE_TABLE(usb, id_table);
 258
 259 struct cp210x_serial_private {
 260 #ifdef CONFIG_GPIOLIB
 261         struct gpio_chip        gc;
 262         u8                      config;
 263         u8                      gpio_mode;
 264         bool                    gpio_registered;
 265 #endif
 266         u8                      partnum;
 267 };
 268
 269 struct cp210x_port_private {
 270         __u8                    bInterfaceNumber;
 271         bool                    has_swapped_line_ctl;
 272 };
 273
 274 static struct usb_serial_driver cp210x_device = {
 275         .driver = {
 276                 .owner =        THIS_MODULE,
 277                 .name =         "cp210x",
 278         },
 279         .id_table               = id_table,
 280         .num_ports              = 1,
 281         .bulk_in_size           = 256,
 282         .bulk_out_size          = 256,
 283         .open                   = cp210x_open,
 284         .close                  = cp210x_close,
 285         .break_ctl              = cp210x_break_ctl,
 286         .set_termios            = cp210x_set_termios,
 287         .tx_empty               = cp210x_tx_empty,
 288         .throttle               = usb_serial_generic_throttle,
 289         .unthrottle             = usb_serial_generic_unthrottle,
 290         .tiocmget               = cp210x_tiocmget,
 291         .tiocmset               = cp210x_tiocmset,
 292         .attach                 = cp210x_attach,
 293         .disconnect             = cp210x_disconnect,
 294         .release                = cp210x_release,
 295         .port_probe             = cp210x_port_probe,
 296         .port_remove            = cp210x_port_remove,
 297         .dtr_rts                = cp210x_dtr_rts
 298 };
 299
 300 static struct usb_serial_driver * const serial_drivers[] = {
 301         &cp210x_device, NULL
 302 };
 303
 304 /* Config request types */
 305 #define REQTYPE_HOST_TO_INTERFACE       0x41
 306 #define REQTYPE_INTERFACE_TO_HOST       0xc1
 307 #define REQTYPE_HOST_TO_DEVICE  0x40
 308 #define REQTYPE_DEVICE_TO_HOST  0xc0
 309
 310 /* Config request codes */
 311 #define CP210X_IFC_ENABLE       0x00
 312 #define CP210X_SET_BAUDDIV      0x01
 313 #define CP210X_GET_BAUDDIV      0x02
 314 #define CP210X_SET_LINE_CTL     0x03
 315 #define CP210X_GET_LINE_CTL     0x04
 316 #define CP210X_SET_BREAK        0x05
 317 #define CP210X_IMM_CHAR         0x06
 318 #define CP210X_SET_MHS          0x07
 319 #define CP210X_GET_MDMSTS       0x08
 320 #define CP210X_SET_XON          0x09
 321 #define CP210X_SET_XOFF         0x0A
 322 #define CP210X_SET_EVENTMASK    0x0B
 323 #define CP210X_GET_EVENTMASK    0x0C
 324 #define CP210X_SET_CHAR         0x0D
 325 #define CP210X_GET_CHARS        0x0E
 326 #define CP210X_GET_PROPS        0x0F
 327 #define CP210X_GET_COMM_STATUS  0x10
 328 #define CP210X_RESET            0x11
 329 #define CP210X_PURGE            0x12
 330 #define CP210X_SET_FLOW         0x13
 331 #define CP210X_GET_FLOW         0x14
 332 #define CP210X_EMBED_EVENTS     0x15
 333 #define CP210X_GET_EVENTSTATE   0x16
 334 #define CP210X_SET_CHARS        0x19
 335 #define CP210X_GET_BAUDRATE     0x1D
 336 #define CP210X_SET_BAUDRATE     0x1E
 337 #define CP210X_VENDOR_SPECIFIC  0xFF
 338
 339 /* CP210X_IFC_ENABLE */
 340 #define UART_ENABLE             0x0001
 341 #define UART_DISABLE            0x0000
 342
 343 /* CP210X_(SET|GET)_BAUDDIV */
 344 #define BAUD_RATE_GEN_FREQ      0x384000
 345
 346 /* CP210X_(SET|GET)_LINE_CTL */
 347 #define BITS_DATA_MASK          0X0f00
 348 #define BITS_DATA_5             0X0500
 349 #define BITS_DATA_6             0X0600
 350 #define BITS_DATA_7             0X0700
 351 #define BITS_DATA_8             0X0800
 352 #define BITS_DATA_9             0X0900
 353
 354 #define BITS_PARITY_MASK        0x00f0
 355 #define BITS_PARITY_NONE        0x0000
 356 #define BITS_PARITY_ODD         0x0010
 357 #define BITS_PARITY_EVEN        0x0020
 358 #define BITS_PARITY_MARK        0x0030
 359 #define BITS_PARITY_SPACE       0x0040
 360
 361 #define BITS_STOP_MASK          0x000f
 362 #define BITS_STOP_1             0x0000
 363 #define BITS_STOP_1_5           0x0001
 364 #define BITS_STOP_2             0x0002
 365
 366 /* CP210X_SET_BREAK */
 367 #define BREAK_ON                0x0001
 368 #define BREAK_OFF               0x0000
 369
 370 /* CP210X_(SET_MHS|GET_MDMSTS) */
 371 #define CONTROL_DTR             0x0001
 372 #define CONTROL_RTS             0x0002
 373 #define CONTROL_CTS             0x0010
 374 #define CONTROL_DSR             0x0020
 375 #define CONTROL_RING            0x0040
 376 #define CONTROL_DCD             0x0080
 377 #define CONTROL_WRITE_DTR       0x0100
 378 #define CONTROL_WRITE_RTS       0x0200
 379
 380 /* CP210X_VENDOR_SPECIFIC values */
 381 #define CP210X_READ_LATCH       0x00C2
 382 #define CP210X_GET_PARTNUM      0x370B
 383 #define CP210X_GET_PORTCONFIG   0x370C
 384 #define CP210X_GET_DEVICEMODE   0x3711
 385 #define CP210X_WRITE_LATCH      0x37E1
 386
 387 /* Part number definitions */
 388 #define CP210X_PARTNUM_CP2101   0x01
 389 #define CP210X_PARTNUM_CP2102   0x02
 390 #define CP210X_PARTNUM_CP2103   0x03
 391 #define CP210X_PARTNUM_CP2104   0x04
 392 #define CP210X_PARTNUM_CP2105   0x05
 393 #define CP210X_PARTNUM_CP2108   0x08
 394 #define CP210X_PARTNUM_UNKNOWN  0xFF
 395
 396 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
 397 struct cp210x_comm_status {
 398         __le32   ulErrors;
 399         __le32   ulHoldReasons;
 400         __le32   ulAmountInInQueue;
 401         __le32   ulAmountInOutQueue;
 402         u8       bEofReceived;
 403         u8       bWaitForImmediate;
 404         u8       bReserved;
 405 } __packed;
 406
 407 /*
 408  * CP210X_PURGE - 16 bits passed in wValue of USB request.
 409  * SiLabs app note AN571 gives a strange description of the 4 bits:
 410  * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
 411  * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
 412  */
 413 #define PURGE_ALL               0x000f
 414
 415 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
 416 struct cp210x_flow_ctl {
 417         __le32  ulControlHandshake;
 418         __le32  ulFlowReplace;
 419         __le32  ulXonLimit;
 420         __le32  ulXoffLimit;
 421 } __packed;
 422
 423 /* cp210x_flow_ctl::ulControlHandshake */
 424 #define CP210X_SERIAL_DTR_MASK          GENMASK(1, 0)
 425 #define CP210X_SERIAL_DTR_SHIFT(_mode)  (_mode)
 426 #define CP210X_SERIAL_CTS_HANDSHAKE     BIT(3)
 427 #define CP210X_SERIAL_DSR_HANDSHAKE     BIT(4)
 428 #define CP210X_SERIAL_DCD_HANDSHAKE     BIT(5)
 429 #define CP210X_SERIAL_DSR_SENSITIVITY   BIT(6)
 430
 431 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
 432 #define CP210X_SERIAL_DTR_INACTIVE      0
 433 #define CP210X_SERIAL_DTR_ACTIVE        1
 434 #define CP210X_SERIAL_DTR_FLOW_CTL      2
 435
 436 /* cp210x_flow_ctl::ulFlowReplace */
 437 #define CP210X_SERIAL_AUTO_TRANSMIT     BIT(0)
 438 #define CP210X_SERIAL_AUTO_RECEIVE      BIT(1)
 439 #define CP210X_SERIAL_ERROR_CHAR        BIT(2)
 440 #define CP210X_SERIAL_NULL_STRIPPING    BIT(3)
 441 #define CP210X_SERIAL_BREAK_CHAR        BIT(4)
 442 #define CP210X_SERIAL_RTS_MASK          GENMASK(7, 6)
 443 #define CP210X_SERIAL_RTS_SHIFT(_mode)  (_mode << 6)
 444 #define CP210X_SERIAL_XOFF_CONTINUE     BIT(31)
 445
 446 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
 447 #define CP210X_SERIAL_RTS_INACTIVE      0
 448 #define CP210X_SERIAL_RTS_ACTIVE        1
 449 #define CP210X_SERIAL_RTS_FLOW_CTL      2
 450
 451 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
 452 struct cp210x_pin_mode {
 453         u8      eci;
 454         u8      sci;
 455 } __packed;
 456
 457 #define CP210X_PIN_MODE_MODEM           0
 458 #define CP210X_PIN_MODE_GPIO            BIT(0)
 459
 460 /*
 461  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes.
 462  * Structure needs padding due to unused/unspecified bytes.
 463  */
 464 struct cp210x_config {
 465         __le16  gpio_mode;
 466         u8      __pad0[2];
 467         __le16  reset_state;
 468         u8      __pad1[4];
 469         __le16  suspend_state;
 470         u8      sci_cfg;
 471         u8      eci_cfg;
 472         u8      device_cfg;
 473 } __packed;
 474
 475 /* GPIO modes */
 476 #define CP210X_SCI_GPIO_MODE_OFFSET     9
 477 #define CP210X_SCI_GPIO_MODE_MASK       GENMASK(11, 9)
 478
 479 #define CP210X_ECI_GPIO_MODE_OFFSET     2
 480 #define CP210X_ECI_GPIO_MODE_MASK       GENMASK(3, 2)
 481
 482 /* CP2105 port configuration values */
 483 #define CP2105_GPIO0_TXLED_MODE         BIT(0)
 484 #define CP2105_GPIO1_RXLED_MODE         BIT(1)
 485 #define CP2105_GPIO1_RS485_MODE         BIT(2)
 486
 487 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
 488 struct cp210x_gpio_write {
 489         u8      mask;
 490         u8      state;
 491 } __packed;
 492
 493 /*
 494  * Helper to get interface number when we only have struct usb_serial.
 495  */
 496 static u8 cp210x_interface_num(struct usb_serial *serial)
 497 {
 498         struct usb_host_interface *cur_altsetting;
 499
 500         cur_altsetting = serial->interface->cur_altsetting;
 501
 502         return cur_altsetting->desc.bInterfaceNumber;
 503 }
 504
 505 /*
 506  * Reads a variable-sized block of CP210X_ registers, identified by req.
 507  * Returns data into buf in native USB byte order.
 508  */
 509 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
 510                 void *buf, int bufsize)
 511 {
 512         struct usb_serial *serial = port->serial;
 513         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 514         void *dmabuf;
 515         int result;
 516
 517         dmabuf = kmalloc(bufsize, GFP_KERNEL);
 518         if (!dmabuf) {
 519                 /*
 520                  * FIXME Some callers don't bother to check for error,
 521                  * at least give them consistent junk until they are fixed
 522                  */
 523                 memset(buf, 0, bufsize);
 524                 return -ENOMEM;
 525         }
 526
 527         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 528                         req, REQTYPE_INTERFACE_TO_HOST, 0,
 529                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 530                         USB_CTRL_SET_TIMEOUT);
 531         if (result == bufsize) {
 532                 memcpy(buf, dmabuf, bufsize);
 533                 result = 0;
 534         } else {
 535                 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
 536                                 req, bufsize, result);
 537                 if (result >= 0)
 538                         result = -EIO;
 539
 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                 memset(buf, 0, bufsize);
 545         }
 546
 547         kfree(dmabuf);
 548
 549         return result;
 550 }
 551
 552 /*
 553  * Reads any 32-bit CP210X_ register identified by req.
 554  */
 555 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
 556 {
 557         __le32 le32_val;
 558         int err;
 559
 560         err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
 561         if (err) {
 562                 /*
 563                  * FIXME Some callers don't bother to check for error,
 564                  * at least give them consistent junk until they are fixed
 565                  */
 566                 *val = 0;
 567                 return err;
 568         }
 569
 570         *val = le32_to_cpu(le32_val);
 571
 572         return 0;
 573 }
 574
 575 /*
 576  * Reads any 16-bit CP210X_ register identified by req.
 577  */
 578 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
 579 {
 580         __le16 le16_val;
 581         int err;
 582
 583         err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
 584         if (err)
 585                 return err;
 586
 587         *val = le16_to_cpu(le16_val);
 588
 589         return 0;
 590 }
 591
 592 /*
 593  * Reads any 8-bit CP210X_ register identified by req.
 594  */
 595 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
 596 {
 597         return cp210x_read_reg_block(port, req, val, sizeof(*val));
 598 }
 599
 600 /*
 601  * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
 602  * Returns data into buf in native USB byte order.
 603  */
 604 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
 605                                     void *buf, int bufsize)
 606 {
 607         void *dmabuf;
 608         int result;
 609
 610         dmabuf = kmalloc(bufsize, GFP_KERNEL);
 611         if (!dmabuf)
 612                 return -ENOMEM;
 613
 614         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 615                                  CP210X_VENDOR_SPECIFIC, type, val,
 616                                  cp210x_interface_num(serial), dmabuf, bufsize,
 617                                  USB_CTRL_GET_TIMEOUT);
 618         if (result == bufsize) {
 619                 memcpy(buf, dmabuf, bufsize);
 620                 result = 0;
 621         } else {
 622                 dev_err(&serial->interface->dev,
 623                         "failed to get vendor val 0x%04x size %d: %d\n", val,
 624                         bufsize, result);
 625                 if (result >= 0)
 626                         result = -EIO;
 627         }
 628
 629         kfree(dmabuf);
 630
 631         return result;
 632 }
 633
 634 /*
 635  * Writes any 16-bit CP210X_ register (req) whose value is passed
 636  * entirely in the wValue field of the USB request.
 637  */
 638 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
 639 {
 640         struct usb_serial *serial = port->serial;
 641         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 642         int result;
 643
 644         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 645                         req, REQTYPE_HOST_TO_INTERFACE, val,
 646                         port_priv->bInterfaceNumber, NULL, 0,
 647                         USB_CTRL_SET_TIMEOUT);
 648         if (result < 0) {
 649                 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
 650                                 req, result);
 651         }
 652
 653         return result;
 654 }
 655
 656 /*
 657  * Writes a variable-sized block of CP210X_ registers, identified by req.
 658  * Data in buf must be in native USB byte order.
 659  */
 660 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
 661                 void *buf, int bufsize)
 662 {
 663         struct usb_serial *serial = port->serial;
 664         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 665         void *dmabuf;
 666         int result;
 667
 668         dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
 669         if (!dmabuf)
 670                 return -ENOMEM;
 671
 672         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 673                         req, REQTYPE_HOST_TO_INTERFACE, 0,
 674                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 675                         USB_CTRL_SET_TIMEOUT);
 676
 677         kfree(dmabuf);
 678
 679         if (result == bufsize) {
 680                 result = 0;
 681         } else {
 682                 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
 683                                 req, bufsize, result);
 684                 if (result >= 0)
 685                         result = -EIO;
 686         }
 687
 688         return result;
 689 }
 690
 691 /*
 692  * Writes any 32-bit CP210X_ register identified by req.
 693  */
 694 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
 695 {
 696         __le32 le32_val;
 697
 698         le32_val = cpu_to_le32(val);
 699
 700         return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
 701 }
 702
 703 #ifdef CONFIG_GPIOLIB
 704 /*
 705  * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
 706  * Data in buf must be in native USB byte order.
 707  */
 708 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
 709                                      u16 val, void *buf, int bufsize)
 710 {
 711         void *dmabuf;
 712         int result;
 713
 714         dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
 715         if (!dmabuf)
 716                 return -ENOMEM;
 717
 718         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 719                                  CP210X_VENDOR_SPECIFIC, type, val,
 720                                  cp210x_interface_num(serial), dmabuf, bufsize,
 721                                  USB_CTRL_SET_TIMEOUT);
 722
 723         kfree(dmabuf);
 724
 725         if (result == bufsize) {
 726                 result = 0;
 727         } else {
 728                 dev_err(&serial->interface->dev,
 729                         "failed to set vendor val 0x%04x size %d: %d\n", val,
 730                         bufsize, result);
 731                 if (result >= 0)
 732                         result = -EIO;
 733         }
 734
 735         return result;
 736 }
 737 #endif
 738
 739 /*
 740  * Detect CP2108 GET_LINE_CTL bug and activate workaround.
 741  * Write a known good value 0x800, read it back.
 742  * If it comes back swapped the bug is detected.
 743  * Preserve the original register value.
 744  */
 745 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
 746 {
 747         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 748         u16 line_ctl_save;
 749         u16 line_ctl_test;
 750         int err;
 751
 752         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
 753         if (err)
 754                 return err;
 755
 756         err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
 757         if (err)
 758                 return err;
 759
 760         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
 761         if (err)
 762                 return err;
 763
 764         if (line_ctl_test == 8) {
 765                 port_priv->has_swapped_line_ctl = true;
 766                 line_ctl_save = swab16(line_ctl_save);
 767         }
 768
 769         return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
 770 }
 771
 772 /*
 773  * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
 774  * to workaround cp2108 bug and get correct value.
 775  */
 776 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
 777 {
 778         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 779         int err;
 780
 781         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
 782         if (err)
 783                 return err;
 784
 785         /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
 786         if (port_priv->has_swapped_line_ctl)
 787                 *ctl = swab16(*ctl);
 788
 789         return 0;
 790 }
 791
 792 /*
 793  * cp210x_quantise_baudrate
 794  * Quantises the baud rate as per AN205 Table 1
 795  */
 796 static unsigned int cp210x_quantise_baudrate(unsigned int baud)
 797 {
 798         if (baud <= 300)
 799                 baud = 300;
 800         else if (baud <= 600)      baud = 600;
 801         else if (baud <= 1200)     baud = 1200;
 802         else if (baud <= 1800)     baud = 1800;
 803         else if (baud <= 2400)     baud = 2400;
 804         else if (baud <= 4000)     baud = 4000;
 805         else if (baud <= 4803)     baud = 4800;
 806         else if (baud <= 7207)     baud = 7200;
 807         else if (baud <= 9612)     baud = 9600;
 808         else if (baud <= 14428)    baud = 14400;
 809         else if (baud <= 16062)    baud = 16000;
 810         else if (baud <= 19250)    baud = 19200;
 811         else if (baud <= 28912)    baud = 28800;
 812         else if (baud <= 38601)    baud = 38400;
 813         else if (baud <= 51558)    baud = 51200;
 814         else if (baud <= 56280)    baud = 56000;
 815         else if (baud <= 58053)    baud = 57600;
 816         else if (baud <= 64111)    baud = 64000;
 817         else if (baud <= 77608)    baud = 76800;
 818         else if (baud <= 117028)   baud = 115200;
 819         else if (baud <= 129347)   baud = 128000;
 820         else if (baud <= 156868)   baud = 153600;
 821         else if (baud <= 237832)   baud = 230400;
 822         else if (baud <= 254234)   baud = 250000;
 823         else if (baud <= 273066)   baud = 256000;
 824         else if (baud <= 491520)   baud = 460800;
 825         else if (baud <= 567138)   baud = 500000;
 826         else if (baud <= 670254)   baud = 576000;
 827         else if (baud < 1000000)
 828                 baud = 921600;
 829         else if (baud > 2000000)
 830                 baud = 2000000;
 831         return baud;
 832 }
 833
 834 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 835 {
 836         int result;
 837
 838         result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
 839         if (result) {
 840                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
 841                 return result;
 842         }
 843
 844         /* Configure the termios structure */
 845         cp210x_get_termios(tty, port);
 846
 847         /* The baud rate must be initialised on cp2104 */
 848         if (tty)
 849                 cp210x_change_speed(tty, port, NULL);
 850
 851         return usb_serial_generic_open(tty, port);
 852 }
 853
 854 static void cp210x_close(struct usb_serial_port *port)
 855 {
 856         usb_serial_generic_close(port);
 857
 858         /* Clear both queues; cp2108 needs this to avoid an occasional hang */
 859         cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
 860
 861         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 862 }
 863
 864 /*
 865  * Read how many bytes are waiting in the TX queue.
 866  */
 867 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
 868                 u32 *count)
 869 {
 870         struct usb_serial *serial = port->serial;
 871         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 872         struct cp210x_comm_status *sts;
 873         int result;
 874
 875         sts = kmalloc(sizeof(*sts), GFP_KERNEL);
 876         if (!sts)
 877                 return -ENOMEM;
 878
 879         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 880                         CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
 881                         0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
 882                         USB_CTRL_GET_TIMEOUT);
 883         if (result == sizeof(*sts)) {
 884                 *count = le32_to_cpu(sts->ulAmountInOutQueue);
 885                 result = 0;
 886         } else {
 887                 dev_err(&port->dev, "failed to get comm status: %d\n", result);
 888                 if (result >= 0)
 889                         result = -EIO;
 890         }
 891
 892         kfree(sts);
 893
 894         return result;
 895 }
 896
 897 static bool cp210x_tx_empty(struct usb_serial_port *port)
 898 {
 899         int err;
 900         u32 count;
 901
 902         err = cp210x_get_tx_queue_byte_count(port, &count);
 903         if (err)
 904                 return true;
 905
 906         return !count;
 907 }
 908
 909 /*
 910  * cp210x_get_termios
 911  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 912  * from the device, corrects any unsupported values, and configures the
 913  * termios structure to reflect the state of the device
 914  */
 915 static void cp210x_get_termios(struct tty_struct *tty,
 916         struct usb_serial_port *port)
 917 {
 918         unsigned int baud;
 919
 920         if (tty) {
 921                 cp210x_get_termios_port(tty->driver_data,
 922                         &tty->termios.c_cflag, &baud);
 923                 tty_encode_baud_rate(tty, baud, baud);
 924         } else {
 925                 tcflag_t cflag;
 926                 cflag = 0;
 927                 cp210x_get_termios_port(port, &cflag, &baud);
 928         }
 929 }
 930
 931 /*
 932  * cp210x_get_termios_port
 933  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
 934  */
 935 static void cp210x_get_termios_port(struct usb_serial_port *port,
 936         tcflag_t *cflagp, unsigned int *baudp)
 937 {
 938         struct device *dev = &port->dev;
 939         tcflag_t cflag;
 940         struct cp210x_flow_ctl flow_ctl;
 941         u32 baud;
 942         u16 bits;
 943         u32 ctl_hs;
 944         u32 flow_repl;
 945
 946         cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
 947
 948         dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
 949         *baudp = baud;
 950
 951         cflag = *cflagp;
 952
 953         cp210x_get_line_ctl(port, &bits);
 954         cflag &= ~CSIZE;
 955         switch (bits & BITS_DATA_MASK) {
 956         case BITS_DATA_5:
 957                 dev_dbg(dev, "%s - data bits = 5\n", __func__);
 958                 cflag |= CS5;
 959                 break;
 960         case BITS_DATA_6:
 961                 dev_dbg(dev, "%s - data bits = 6\n", __func__);
 962                 cflag |= CS6;
 963                 break;
 964         case BITS_DATA_7:
 965                 dev_dbg(dev, "%s - data bits = 7\n", __func__);
 966                 cflag |= CS7;
 967                 break;
 968         case BITS_DATA_8:
 969                 dev_dbg(dev, "%s - data bits = 8\n", __func__);
 970                 cflag |= CS8;
 971                 break;
 972         case BITS_DATA_9:
 973                 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
 974                 cflag |= CS8;
 975                 bits &= ~BITS_DATA_MASK;
 976                 bits |= BITS_DATA_8;
 977                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 978                 break;
 979         default:
 980                 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
 981                 cflag |= CS8;
 982                 bits &= ~BITS_DATA_MASK;
 983                 bits |= BITS_DATA_8;
 984                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 985                 break;
 986         }
 987
 988         switch (bits & BITS_PARITY_MASK) {
 989         case BITS_PARITY_NONE:
 990                 dev_dbg(dev, "%s - parity = NONE\n", __func__);
 991                 cflag &= ~PARENB;
 992                 break;
 993         case BITS_PARITY_ODD:
 994                 dev_dbg(dev, "%s - parity = ODD\n", __func__);
 995                 cflag |= (PARENB|PARODD);
 996                 break;
 997         case BITS_PARITY_EVEN:
 998                 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
 999                 cflag &= ~PARODD;
1000                 cflag |= PARENB;
1001                 break;
1002         case BITS_PARITY_MARK:
1003                 dev_dbg(dev, "%s - parity = MARK\n", __func__);
1004                 cflag |= (PARENB|PARODD|CMSPAR);
1005                 break;
1006         case BITS_PARITY_SPACE:
1007                 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1008                 cflag &= ~PARODD;
1009                 cflag |= (PARENB|CMSPAR);
1010                 break;
1011         default:
1012                 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
1013                 cflag &= ~PARENB;
1014                 bits &= ~BITS_PARITY_MASK;
1015                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1016                 break;
1017         }
1018
1019         cflag &= ~CSTOPB;
1020         switch (bits & BITS_STOP_MASK) {
1021         case BITS_STOP_1:
1022                 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1023                 break;
1024         case BITS_STOP_1_5:
1025                 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
1026                 bits &= ~BITS_STOP_MASK;
1027                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1028                 break;
1029         case BITS_STOP_2:
1030                 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1031                 cflag |= CSTOPB;
1032                 break;
1033         default:
1034                 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
1035                 bits &= ~BITS_STOP_MASK;
1036                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1037                 break;
1038         }
1039
1040         cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1041                         sizeof(flow_ctl));
1042         ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1043         if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
1044                 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1045                 /*
1046                  * When the port is closed, the CP210x hardware disables
1047                  * auto-RTS and RTS is deasserted but it leaves auto-CTS when
1048                  * in hardware flow control mode. When re-opening the port, if
1049                  * auto-CTS is enabled on the cp210x, then auto-RTS must be
1050                  * re-enabled in the driver.
1051                  */
1052                 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1053                 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1054                 flow_repl |= CP210X_SERIAL_RTS_SHIFT(CP210X_SERIAL_RTS_FLOW_CTL);
1055                 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1056                 cp210x_write_reg_block(port,
1057                                 CP210X_SET_FLOW,
1058                                 &flow_ctl,
1059                                 sizeof(flow_ctl));
1060
1061                 cflag |= CRTSCTS;
1062         } else {
1063                 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1064                 cflag &= ~CRTSCTS;
1065         }
1066
1067         *cflagp = cflag;
1068 }
1069
1070 /*
1071  * CP2101 supports the following baud rates:
1072  *
1073  *      300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1074  *      38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1075  *
1076  * CP2102 and CP2103 support the following additional rates:
1077  *
1078  *      4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1079  *      576000
1080  *
1081  * The device will map a requested rate to a supported one, but the result
1082  * of requests for rates greater than 1053257 is undefined (see AN205).
1083  *
1084  * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1085  * respectively, with an error less than 1%. The actual rates are determined
1086  * by
1087  *
1088  *      div = round(freq / (2 x prescale x request))
1089  *      actual = freq / (2 x prescale x div)
1090  *
1091  * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1092  * or 1 otherwise.
1093  * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1094  * otherwise.
1095  */
1096 static void cp210x_change_speed(struct tty_struct *tty,
1097                 struct usb_serial_port *port, struct ktermios *old_termios)
1098 {
1099         u32 baud;
1100
1101         baud = tty->termios.c_ospeed;
1102
1103         /* This maps the requested rate to a rate valid on cp2102 or cp2103,
1104          * or to an arbitrary rate in [1M,2M].
1105          *
1106          * NOTE: B0 is not implemented.
1107          */
1108         baud = cp210x_quantise_baudrate(baud);
1109
1110         dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1111         if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1112                 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1113                 if (old_termios)
1114                         baud = old_termios->c_ospeed;
1115                 else
1116                         baud = 9600;
1117         }
1118
1119         tty_encode_baud_rate(tty, baud, baud);
1120 }
1121
1122 static void cp210x_set_termios(struct tty_struct *tty,
1123                 struct usb_serial_port *port, struct ktermios *old_termios)
1124 {
1125         struct device *dev = &port->dev;
1126         unsigned int cflag, old_cflag;
1127         u16 bits;
1128
1129         cflag = tty->termios.c_cflag;
1130         old_cflag = old_termios->c_cflag;
1131
1132         if (tty->termios.c_ospeed != old_termios->c_ospeed)
1133                 cp210x_change_speed(tty, port, old_termios);
1134
1135         /* If the number of data bits is to be updated */
1136         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
1137                 cp210x_get_line_ctl(port, &bits);
1138                 bits &= ~BITS_DATA_MASK;
1139                 switch (cflag & CSIZE) {
1140                 case CS5:
1141                         bits |= BITS_DATA_5;
1142                         dev_dbg(dev, "%s - data bits = 5\n", __func__);
1143                         break;
1144                 case CS6:
1145                         bits |= BITS_DATA_6;
1146                         dev_dbg(dev, "%s - data bits = 6\n", __func__);
1147                         break;
1148                 case CS7:
1149                         bits |= BITS_DATA_7;
1150                         dev_dbg(dev, "%s - data bits = 7\n", __func__);
1151                         break;
1152                 case CS8:
1153                 default:
1154                         bits |= BITS_DATA_8;
1155                         dev_dbg(dev, "%s - data bits = 8\n", __func__);
1156                         break;
1157                 }
1158                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1159                         dev_dbg(dev, "Number of data bits requested not supported by device\n");
1160         }
1161
1162         if ((cflag     & (PARENB|PARODD|CMSPAR)) !=
1163             (old_cflag & (PARENB|PARODD|CMSPAR))) {
1164                 cp210x_get_line_ctl(port, &bits);
1165                 bits &= ~BITS_PARITY_MASK;
1166                 if (cflag & PARENB) {
1167                         if (cflag & CMSPAR) {
1168                                 if (cflag & PARODD) {
1169                                         bits |= BITS_PARITY_MARK;
1170                                         dev_dbg(dev, "%s - parity = MARK\n", __func__);
1171                                 } else {
1172                                         bits |= BITS_PARITY_SPACE;
1173                                         dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1174                                 }
1175                         } else {
1176                                 if (cflag & PARODD) {
1177                                         bits |= BITS_PARITY_ODD;
1178                                         dev_dbg(dev, "%s - parity = ODD\n", __func__);
1179                                 } else {
1180                                         bits |= BITS_PARITY_EVEN;
1181                                         dev_dbg(dev, "%s - parity = EVEN\n", __func__);
1182                                 }
1183                         }
1184                 }
1185                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1186                         dev_dbg(dev, "Parity mode not supported by device\n");
1187         }
1188
1189         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
1190                 cp210x_get_line_ctl(port, &bits);
1191                 bits &= ~BITS_STOP_MASK;
1192                 if (cflag & CSTOPB) {
1193                         bits |= BITS_STOP_2;
1194                         dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1195                 } else {
1196                         bits |= BITS_STOP_1;
1197                         dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1198                 }
1199                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1200                         dev_dbg(dev, "Number of stop bits requested not supported by device\n");
1201         }
1202
1203         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
1204                 struct cp210x_flow_ctl flow_ctl;
1205                 u32 ctl_hs;
1206                 u32 flow_repl;
1207
1208                 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1209                                 sizeof(flow_ctl));
1210                 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1211                 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1212                 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1213                                 __func__, ctl_hs, flow_repl);
1214
1215                 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1216                 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1217                 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1218                 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1219                 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1220                 if (cflag & CRTSCTS) {
1221                         ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1222
1223                         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1224                         flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1225                                         CP210X_SERIAL_RTS_FLOW_CTL);
1226                         dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1227                 } else {
1228                         ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1229
1230                         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1231                         flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1232                                         CP210X_SERIAL_RTS_ACTIVE);
1233                         dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1234                 }
1235
1236                 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1237                                 __func__, ctl_hs, flow_repl);
1238                 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1239                 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1240                 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1241                                 sizeof(flow_ctl));
1242         }
1243
1244 }
1245
1246 static int cp210x_tiocmset(struct tty_struct *tty,
1247                 unsigned int set, unsigned int clear)
1248 {
1249         struct usb_serial_port *port = tty->driver_data;
1250         return cp210x_tiocmset_port(port, set, clear);
1251 }
1252
1253 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1254                 unsigned int set, unsigned int clear)
1255 {
1256         u16 control = 0;
1257
1258         if (set & TIOCM_RTS) {
1259                 control |= CONTROL_RTS;
1260                 control |= CONTROL_WRITE_RTS;
1261         }
1262         if (set & TIOCM_DTR) {
1263                 control |= CONTROL_DTR;
1264                 control |= CONTROL_WRITE_DTR;
1265         }
1266         if (clear & TIOCM_RTS) {
1267                 control &= ~CONTROL_RTS;
1268                 control |= CONTROL_WRITE_RTS;
1269         }
1270         if (clear & TIOCM_DTR) {
1271                 control &= ~CONTROL_DTR;
1272                 control |= CONTROL_WRITE_DTR;
1273         }
1274
1275         dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1276
1277         return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1278 }
1279
1280 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1281 {
1282         if (on)
1283                 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1284         else
1285                 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1286 }
1287
1288 static int cp210x_tiocmget(struct tty_struct *tty)
1289 {
1290         struct usb_serial_port *port = tty->driver_data;
1291         u8 control;
1292         int result;
1293
1294         result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1295         if (result)
1296                 return result;
1297
1298         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1299                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1300                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1301                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1302                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
1303                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
1304
1305         dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1306
1307         return result;
1308 }
1309
1310 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1311 {
1312         struct usb_serial_port *port = tty->driver_data;
1313         u16 state;
1314
1315         if (break_state == 0)
1316                 state = BREAK_OFF;
1317         else
1318                 state = BREAK_ON;
1319         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1320                 state == BREAK_OFF ? "off" : "on");
1321         cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1322 }
1323
1324 #ifdef CONFIG_GPIOLIB
1325 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset)
1326 {
1327         struct usb_serial *serial = gpiochip_get_data(gc);
1328         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1329
1330         switch (offset) {
1331         case 0:
1332                 if (priv->config & CP2105_GPIO0_TXLED_MODE)
1333                         return -ENODEV;
1334                 break;
1335         case 1:
1336                 if (priv->config & (CP2105_GPIO1_RXLED_MODE |
1337                                     CP2105_GPIO1_RS485_MODE))
1338                         return -ENODEV;
1339                 break;
1340         }
1341
1342         return 0;
1343 }
1344
1345 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1346 {
1347         struct usb_serial *serial = gpiochip_get_data(gc);
1348         int result;
1349         u8 buf;
1350
1351         result = cp210x_read_vendor_block(serial, REQTYPE_INTERFACE_TO_HOST,
1352                                           CP210X_READ_LATCH, &buf, sizeof(buf));
1353         if (result < 0)
1354                 return result;
1355
1356         return !!(buf & BIT(gpio));
1357 }
1358
1359 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1360 {
1361         struct usb_serial *serial = gpiochip_get_data(gc);
1362         struct cp210x_gpio_write buf;
1363
1364         if (value == 1)
1365                 buf.state = BIT(gpio);
1366         else
1367                 buf.state = 0;
1368
1369         buf.mask = BIT(gpio);
1370
1371         cp210x_write_vendor_block(serial, REQTYPE_HOST_TO_INTERFACE,
1372                                   CP210X_WRITE_LATCH, &buf, sizeof(buf));
1373 }
1374
1375 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1376 {
1377         /* Hardware does not support an input mode */
1378         return 0;
1379 }
1380
1381 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1382 {
1383         /* Hardware does not support an input mode */
1384         return -ENOTSUPP;
1385 }
1386
1387 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1388                                         int value)
1389 {
1390         return 0;
1391 }
1392
1393 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1394                                   unsigned long config)
1395 {
1396         struct usb_serial *serial = gpiochip_get_data(gc);
1397         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1398         enum pin_config_param param = pinconf_to_config_param(config);
1399
1400         /* Succeed only if in correct mode (this can't be set at runtime) */
1401         if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1402             (priv->gpio_mode & BIT(gpio)))
1403                 return 0;
1404
1405         if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1406             !(priv->gpio_mode & BIT(gpio)))
1407                 return 0;
1408
1409         return -ENOTSUPP;
1410 }
1411
1412 /*
1413  * This function is for configuring GPIO using shared pins, where other signals
1414  * are made unavailable by configuring the use of GPIO. This is believed to be
1415  * only applicable to the cp2105 at this point, the other devices supported by
1416  * this driver that provide GPIO do so in a way that does not impact other
1417  * signals and are thus expected to have very different initialisation.
1418  */
1419 static int cp2105_shared_gpio_init(struct usb_serial *serial)
1420 {
1421         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1422         struct cp210x_pin_mode mode;
1423         struct cp210x_config config;
1424         u8 intf_num = cp210x_interface_num(serial);
1425         int result;
1426
1427         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1428                                           CP210X_GET_DEVICEMODE, &mode,
1429                                           sizeof(mode));
1430         if (result < 0)
1431                 return result;
1432
1433         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1434                                           CP210X_GET_PORTCONFIG, &config,
1435                                           sizeof(config));
1436         if (result < 0)
1437                 return result;
1438
1439         /*  2 banks of GPIO - One for the pins taken from each serial port */
1440         if (intf_num == 0) {
1441                 if (mode.eci == CP210X_PIN_MODE_MODEM)
1442                         return 0;
1443
1444                 priv->config = config.eci_cfg;
1445                 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
1446                                                 CP210X_ECI_GPIO_MODE_MASK) >>
1447                                                 CP210X_ECI_GPIO_MODE_OFFSET);
1448                 priv->gc.ngpio = 2;
1449         } else if (intf_num == 1) {
1450                 if (mode.sci == CP210X_PIN_MODE_MODEM)
1451                         return 0;
1452
1453                 priv->config = config.sci_cfg;
1454                 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
1455                                                 CP210X_SCI_GPIO_MODE_MASK) >>
1456                                                 CP210X_SCI_GPIO_MODE_OFFSET);
1457                 priv->gc.ngpio = 3;
1458         } else {
1459                 return -ENODEV;
1460         }
1461
1462         priv->gc.label = "cp210x";
1463         priv->gc.request = cp210x_gpio_request;
1464         priv->gc.get_direction = cp210x_gpio_direction_get;
1465         priv->gc.direction_input = cp210x_gpio_direction_input;
1466         priv->gc.direction_output = cp210x_gpio_direction_output;
1467         priv->gc.get = cp210x_gpio_get;
1468         priv->gc.set = cp210x_gpio_set;
1469         priv->gc.set_config = cp210x_gpio_set_config;
1470         priv->gc.owner = THIS_MODULE;
1471         priv->gc.parent = &serial->interface->dev;
1472         priv->gc.base = -1;
1473         priv->gc.can_sleep = true;
1474
1475         result = gpiochip_add_data(&priv->gc, serial);
1476         if (!result)
1477                 priv->gpio_registered = true;
1478
1479         return result;
1480 }
1481
1482 static void cp210x_gpio_remove(struct usb_serial *serial)
1483 {
1484         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1485
1486         if (priv->gpio_registered) {
1487                 gpiochip_remove(&priv->gc);
1488                 priv->gpio_registered = false;
1489         }
1490 }
1491
1492 #else
1493
1494 static int cp2105_shared_gpio_init(struct usb_serial *serial)
1495 {
1496         return 0;
1497 }
1498
1499 static void cp210x_gpio_remove(struct usb_serial *serial)
1500 {
1501         /* Nothing to do */
1502 }
1503
1504 #endif
1505
1506 static int cp210x_port_probe(struct usb_serial_port *port)
1507 {
1508         struct usb_serial *serial = port->serial;
1509         struct cp210x_port_private *port_priv;
1510         int ret;
1511
1512         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1513         if (!port_priv)
1514                 return -ENOMEM;
1515
1516         port_priv->bInterfaceNumber = cp210x_interface_num(serial);
1517
1518         usb_set_serial_port_data(port, port_priv);
1519
1520         ret = cp210x_detect_swapped_line_ctl(port);
1521         if (ret) {
1522                 kfree(port_priv);
1523                 return ret;
1524         }
1525
1526         return 0;
1527 }
1528
1529 static int cp210x_port_remove(struct usb_serial_port *port)
1530 {
1531         struct cp210x_port_private *port_priv;
1532
1533         port_priv = usb_get_serial_port_data(port);
1534         kfree(port_priv);
1535
1536         return 0;
1537 }
1538
1539 static int cp210x_attach(struct usb_serial *serial)
1540 {
1541         int result;
1542         struct cp210x_serial_private *priv;
1543
1544         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1545         if (!priv)
1546                 return -ENOMEM;
1547
1548         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1549                                           CP210X_GET_PARTNUM, &priv->partnum,
1550                                           sizeof(priv->partnum));
1551         if (result < 0) {
1552                 dev_warn(&serial->interface->dev,
1553                          "querying part number failed\n");
1554                 priv->partnum = CP210X_PARTNUM_UNKNOWN;
1555         }
1556
1557         usb_set_serial_data(serial, priv);
1558
1559         if (priv->partnum == CP210X_PARTNUM_CP2105) {
1560                 result = cp2105_shared_gpio_init(serial);
1561                 if (result < 0) {
1562                         dev_err(&serial->interface->dev,
1563                                 "GPIO initialisation failed, continuing without GPIO support\n");
1564                 }
1565         }
1566
1567         return 0;
1568 }
1569
1570 static void cp210x_disconnect(struct usb_serial *serial)
1571 {
1572         cp210x_gpio_remove(serial);
1573 }
1574
1575 static void cp210x_release(struct usb_serial *serial)
1576 {
1577         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1578
1579         cp210x_gpio_remove(serial);
1580
1581         kfree(priv);
1582 }
1583
1584 module_usb_serial_driver(serial_drivers, id_table);
1585
1586 MODULE_DESCRIPTION(DRIVER_DESC);
1587 MODULE_LICENSE("GPL");