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, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
 138         { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
 139         { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
 140         { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
 141         { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
 142         { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */
 143         { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */
 144         { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */
 145         { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
 146         { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
 147         { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
 148         { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
 149         { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
 150         { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
 151         { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
 152         { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
 153         { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
 154         { USB_DEVICE(0x10C4, 0x88D8) }, /* Acuity Brands nLight Air Adapter */
 155         { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */
 156         { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */
 157         { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
 158         { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
 159         { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
 160         { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
 161         { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */
 162         { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */
 163         { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
 164         { USB_DEVICE(0x10C4, 0x8A5B) }, /* CEL EM3588 ZigBee USB Stick */
 165         { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
 166         { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
 167         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 168         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 169         { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */
 170         { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
 171         { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
 172         { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */
 173         { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */
 174         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 175         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 176         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 177         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 178         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 179         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 180         { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
 181         { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
 182         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 183         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 184         { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */
 185         { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
 186         { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
 187         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 188         { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
 189         { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
 190         { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
 191         { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
 192         { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
 193         { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
 194         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 195         { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
 196         { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
 197         { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
 198         { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
 199         { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
 200         { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
 201         { USB_DEVICE(0x17A8, 0x0101) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Int Ant) */
 202         { USB_DEVICE(0x17A8, 0x0102) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Ext Ant) */
 203         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
 204         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
 205         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 206         { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
 207         { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
 208         { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
 209         { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
 210         { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
 211         { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
 212         { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
 213         { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
 214         { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 M.2 Key E serial interface */
 215         { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 Display serial interface */
 216         { USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */
 217         { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
 218         { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
 219         { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
 220         { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
 221         { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
 222         { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
 223         { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
 224         { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
 225         { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
 226         { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
 227         { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
 228         { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
 229         { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
 230         { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
 231         { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
 232         { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
 233         { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
 234         { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
 235         { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
 236         { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
 237         { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
 238         { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
 239         { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
 240         { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
 241         { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
 242         { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
 243         { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
 244         { USB_DEVICE(0x2184, 0x0030) }, /* GW Instek GDM-834x Digital Multimeter */
 245         { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
 246         { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
 247         { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
 248         { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
 249         { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
 250         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 251         { } /* Terminating Entry */
 252 };
 253
 254 MODULE_DEVICE_TABLE(usb, id_table);
 255
 256 struct cp210x_serial_private {
 257 #ifdef CONFIG_GPIOLIB
 258         struct gpio_chip        gc;
 259         u8                      config;
 260         u8                      gpio_mode;
 261         bool                    gpio_registered;
 262 #endif
 263         u8                      partnum;
 264 };
 265
 266 struct cp210x_port_private {
 267         __u8                    bInterfaceNumber;
 268         bool                    has_swapped_line_ctl;
 269 };
 270
 271 static struct usb_serial_driver cp210x_device = {
 272         .driver = {
 273                 .owner =        THIS_MODULE,
 274                 .name =         "cp210x",
 275         },
 276         .id_table               = id_table,
 277         .num_ports              = 1,
 278         .bulk_in_size           = 256,
 279         .bulk_out_size          = 256,
 280         .open                   = cp210x_open,
 281         .close                  = cp210x_close,
 282         .break_ctl              = cp210x_break_ctl,
 283         .set_termios            = cp210x_set_termios,
 284         .tx_empty               = cp210x_tx_empty,
 285         .throttle               = usb_serial_generic_throttle,
 286         .unthrottle             = usb_serial_generic_unthrottle,
 287         .tiocmget               = cp210x_tiocmget,
 288         .tiocmset               = cp210x_tiocmset,
 289         .attach                 = cp210x_attach,
 290         .disconnect             = cp210x_disconnect,
 291         .release                = cp210x_release,
 292         .port_probe             = cp210x_port_probe,
 293         .port_remove            = cp210x_port_remove,
 294         .dtr_rts                = cp210x_dtr_rts
 295 };
 296
 297 static struct usb_serial_driver * const serial_drivers[] = {
 298         &cp210x_device, NULL
 299 };
 300
 301 /* Config request types */
 302 #define REQTYPE_HOST_TO_INTERFACE       0x41
 303 #define REQTYPE_INTERFACE_TO_HOST       0xc1
 304 #define REQTYPE_HOST_TO_DEVICE  0x40
 305 #define REQTYPE_DEVICE_TO_HOST  0xc0
 306
 307 /* Config request codes */
 308 #define CP210X_IFC_ENABLE       0x00
 309 #define CP210X_SET_BAUDDIV      0x01
 310 #define CP210X_GET_BAUDDIV      0x02
 311 #define CP210X_SET_LINE_CTL     0x03
 312 #define CP210X_GET_LINE_CTL     0x04
 313 #define CP210X_SET_BREAK        0x05
 314 #define CP210X_IMM_CHAR         0x06
 315 #define CP210X_SET_MHS          0x07
 316 #define CP210X_GET_MDMSTS       0x08
 317 #define CP210X_SET_XON          0x09
 318 #define CP210X_SET_XOFF         0x0A
 319 #define CP210X_SET_EVENTMASK    0x0B
 320 #define CP210X_GET_EVENTMASK    0x0C
 321 #define CP210X_SET_CHAR         0x0D
 322 #define CP210X_GET_CHARS        0x0E
 323 #define CP210X_GET_PROPS        0x0F
 324 #define CP210X_GET_COMM_STATUS  0x10
 325 #define CP210X_RESET            0x11
 326 #define CP210X_PURGE            0x12
 327 #define CP210X_SET_FLOW         0x13
 328 #define CP210X_GET_FLOW         0x14
 329 #define CP210X_EMBED_EVENTS     0x15
 330 #define CP210X_GET_EVENTSTATE   0x16
 331 #define CP210X_SET_CHARS        0x19
 332 #define CP210X_GET_BAUDRATE     0x1D
 333 #define CP210X_SET_BAUDRATE     0x1E
 334 #define CP210X_VENDOR_SPECIFIC  0xFF
 335
 336 /* CP210X_IFC_ENABLE */
 337 #define UART_ENABLE             0x0001
 338 #define UART_DISABLE            0x0000
 339
 340 /* CP210X_(SET|GET)_BAUDDIV */
 341 #define BAUD_RATE_GEN_FREQ      0x384000
 342
 343 /* CP210X_(SET|GET)_LINE_CTL */
 344 #define BITS_DATA_MASK          0X0f00
 345 #define BITS_DATA_5             0X0500
 346 #define BITS_DATA_6             0X0600
 347 #define BITS_DATA_7             0X0700
 348 #define BITS_DATA_8             0X0800
 349 #define BITS_DATA_9             0X0900
 350
 351 #define BITS_PARITY_MASK        0x00f0
 352 #define BITS_PARITY_NONE        0x0000
 353 #define BITS_PARITY_ODD         0x0010
 354 #define BITS_PARITY_EVEN        0x0020
 355 #define BITS_PARITY_MARK        0x0030
 356 #define BITS_PARITY_SPACE       0x0040
 357
 358 #define BITS_STOP_MASK          0x000f
 359 #define BITS_STOP_1             0x0000
 360 #define BITS_STOP_1_5           0x0001
 361 #define BITS_STOP_2             0x0002
 362
 363 /* CP210X_SET_BREAK */
 364 #define BREAK_ON                0x0001
 365 #define BREAK_OFF               0x0000
 366
 367 /* CP210X_(SET_MHS|GET_MDMSTS) */
 368 #define CONTROL_DTR             0x0001
 369 #define CONTROL_RTS             0x0002
 370 #define CONTROL_CTS             0x0010
 371 #define CONTROL_DSR             0x0020
 372 #define CONTROL_RING            0x0040
 373 #define CONTROL_DCD             0x0080
 374 #define CONTROL_WRITE_DTR       0x0100
 375 #define CONTROL_WRITE_RTS       0x0200
 376
 377 /* CP210X_VENDOR_SPECIFIC values */
 378 #define CP210X_READ_LATCH       0x00C2
 379 #define CP210X_GET_PARTNUM      0x370B
 380 #define CP210X_GET_PORTCONFIG   0x370C
 381 #define CP210X_GET_DEVICEMODE   0x3711
 382 #define CP210X_WRITE_LATCH      0x37E1
 383
 384 /* Part number definitions */
 385 #define CP210X_PARTNUM_CP2101   0x01
 386 #define CP210X_PARTNUM_CP2102   0x02
 387 #define CP210X_PARTNUM_CP2103   0x03
 388 #define CP210X_PARTNUM_CP2104   0x04
 389 #define CP210X_PARTNUM_CP2105   0x05
 390 #define CP210X_PARTNUM_CP2108   0x08
 391 #define CP210X_PARTNUM_UNKNOWN  0xFF
 392
 393 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
 394 struct cp210x_comm_status {
 395         __le32   ulErrors;
 396         __le32   ulHoldReasons;
 397         __le32   ulAmountInInQueue;
 398         __le32   ulAmountInOutQueue;
 399         u8       bEofReceived;
 400         u8       bWaitForImmediate;
 401         u8       bReserved;
 402 } __packed;
 403
 404 /*
 405  * CP210X_PURGE - 16 bits passed in wValue of USB request.
 406  * SiLabs app note AN571 gives a strange description of the 4 bits:
 407  * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
 408  * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
 409  */
 410 #define PURGE_ALL               0x000f
 411
 412 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
 413 struct cp210x_flow_ctl {
 414         __le32  ulControlHandshake;
 415         __le32  ulFlowReplace;
 416         __le32  ulXonLimit;
 417         __le32  ulXoffLimit;
 418 } __packed;
 419
 420 /* cp210x_flow_ctl::ulControlHandshake */
 421 #define CP210X_SERIAL_DTR_MASK          GENMASK(1, 0)
 422 #define CP210X_SERIAL_DTR_SHIFT(_mode)  (_mode)
 423 #define CP210X_SERIAL_CTS_HANDSHAKE     BIT(3)
 424 #define CP210X_SERIAL_DSR_HANDSHAKE     BIT(4)
 425 #define CP210X_SERIAL_DCD_HANDSHAKE     BIT(5)
 426 #define CP210X_SERIAL_DSR_SENSITIVITY   BIT(6)
 427
 428 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
 429 #define CP210X_SERIAL_DTR_INACTIVE      0
 430 #define CP210X_SERIAL_DTR_ACTIVE        1
 431 #define CP210X_SERIAL_DTR_FLOW_CTL      2
 432
 433 /* cp210x_flow_ctl::ulFlowReplace */
 434 #define CP210X_SERIAL_AUTO_TRANSMIT     BIT(0)
 435 #define CP210X_SERIAL_AUTO_RECEIVE      BIT(1)
 436 #define CP210X_SERIAL_ERROR_CHAR        BIT(2)
 437 #define CP210X_SERIAL_NULL_STRIPPING    BIT(3)
 438 #define CP210X_SERIAL_BREAK_CHAR        BIT(4)
 439 #define CP210X_SERIAL_RTS_MASK          GENMASK(7, 6)
 440 #define CP210X_SERIAL_RTS_SHIFT(_mode)  (_mode << 6)
 441 #define CP210X_SERIAL_XOFF_CONTINUE     BIT(31)
 442
 443 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
 444 #define CP210X_SERIAL_RTS_INACTIVE      0
 445 #define CP210X_SERIAL_RTS_ACTIVE        1
 446 #define CP210X_SERIAL_RTS_FLOW_CTL      2
 447
 448 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
 449 struct cp210x_pin_mode {
 450         u8      eci;
 451         u8      sci;
 452 } __packed;
 453
 454 #define CP210X_PIN_MODE_MODEM           0
 455 #define CP210X_PIN_MODE_GPIO            BIT(0)
 456
 457 /*
 458  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes.
 459  * Structure needs padding due to unused/unspecified bytes.
 460  */
 461 struct cp210x_config {
 462         __le16  gpio_mode;
 463         u8      __pad0[2];
 464         __le16  reset_state;
 465         u8      __pad1[4];
 466         __le16  suspend_state;
 467         u8      sci_cfg;
 468         u8      eci_cfg;
 469         u8      device_cfg;
 470 } __packed;
 471
 472 /* GPIO modes */
 473 #define CP210X_SCI_GPIO_MODE_OFFSET     9
 474 #define CP210X_SCI_GPIO_MODE_MASK       GENMASK(11, 9)
 475
 476 #define CP210X_ECI_GPIO_MODE_OFFSET     2
 477 #define CP210X_ECI_GPIO_MODE_MASK       GENMASK(3, 2)
 478
 479 /* CP2105 port configuration values */
 480 #define CP2105_GPIO0_TXLED_MODE         BIT(0)
 481 #define CP2105_GPIO1_RXLED_MODE         BIT(1)
 482 #define CP2105_GPIO1_RS485_MODE         BIT(2)
 483
 484 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
 485 struct cp210x_gpio_write {
 486         u8      mask;
 487         u8      state;
 488 } __packed;
 489
 490 /*
 491  * Helper to get interface number when we only have struct usb_serial.
 492  */
 493 static u8 cp210x_interface_num(struct usb_serial *serial)
 494 {
 495         struct usb_host_interface *cur_altsetting;
 496
 497         cur_altsetting = serial->interface->cur_altsetting;
 498
 499         return cur_altsetting->desc.bInterfaceNumber;
 500 }
 501
 502 /*
 503  * Reads a variable-sized block of CP210X_ registers, identified by req.
 504  * Returns data into buf in native USB byte order.
 505  */
 506 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
 507                 void *buf, int bufsize)
 508 {
 509         struct usb_serial *serial = port->serial;
 510         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 511         void *dmabuf;
 512         int result;
 513
 514         dmabuf = kmalloc(bufsize, GFP_KERNEL);
 515         if (!dmabuf) {
 516                 /*
 517                  * FIXME Some callers don't bother to check for error,
 518                  * at least give them consistent junk until they are fixed
 519                  */
 520                 memset(buf, 0, bufsize);
 521                 return -ENOMEM;
 522         }
 523
 524         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 525                         req, REQTYPE_INTERFACE_TO_HOST, 0,
 526                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 527                         USB_CTRL_SET_TIMEOUT);
 528         if (result == bufsize) {
 529                 memcpy(buf, dmabuf, bufsize);
 530                 result = 0;
 531         } else {
 532                 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
 533                                 req, bufsize, result);
 534                 if (result >= 0)
 535                         result = -EIO;
 536
 537                 /*
 538                  * FIXME Some callers don't bother to check for error,
 539                  * at least give them consistent junk until they are fixed
 540                  */
 541                 memset(buf, 0, bufsize);
 542         }
 543
 544         kfree(dmabuf);
 545
 546         return result;
 547 }
 548
 549 /*
 550  * Reads any 32-bit CP210X_ register identified by req.
 551  */
 552 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
 553 {
 554         __le32 le32_val;
 555         int err;
 556
 557         err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
 558         if (err) {
 559                 /*
 560                  * FIXME Some callers don't bother to check for error,
 561                  * at least give them consistent junk until they are fixed
 562                  */
 563                 *val = 0;
 564                 return err;
 565         }
 566
 567         *val = le32_to_cpu(le32_val);
 568
 569         return 0;
 570 }
 571
 572 /*
 573  * Reads any 16-bit CP210X_ register identified by req.
 574  */
 575 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
 576 {
 577         __le16 le16_val;
 578         int err;
 579
 580         err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
 581         if (err)
 582                 return err;
 583
 584         *val = le16_to_cpu(le16_val);
 585
 586         return 0;
 587 }
 588
 589 /*
 590  * Reads any 8-bit CP210X_ register identified by req.
 591  */
 592 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
 593 {
 594         return cp210x_read_reg_block(port, req, val, sizeof(*val));
 595 }
 596
 597 /*
 598  * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
 599  * Returns data into buf in native USB byte order.
 600  */
 601 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
 602                                     void *buf, int bufsize)
 603 {
 604         void *dmabuf;
 605         int result;
 606
 607         dmabuf = kmalloc(bufsize, GFP_KERNEL);
 608         if (!dmabuf)
 609                 return -ENOMEM;
 610
 611         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 612                                  CP210X_VENDOR_SPECIFIC, type, val,
 613                                  cp210x_interface_num(serial), dmabuf, bufsize,
 614                                  USB_CTRL_GET_TIMEOUT);
 615         if (result == bufsize) {
 616                 memcpy(buf, dmabuf, bufsize);
 617                 result = 0;
 618         } else {
 619                 dev_err(&serial->interface->dev,
 620                         "failed to get vendor val 0x%04x size %d: %d\n", val,
 621                         bufsize, result);
 622                 if (result >= 0)
 623                         result = -EIO;
 624         }
 625
 626         kfree(dmabuf);
 627
 628         return result;
 629 }
 630
 631 /*
 632  * Writes any 16-bit CP210X_ register (req) whose value is passed
 633  * entirely in the wValue field of the USB request.
 634  */
 635 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
 636 {
 637         struct usb_serial *serial = port->serial;
 638         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 639         int result;
 640
 641         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 642                         req, REQTYPE_HOST_TO_INTERFACE, val,
 643                         port_priv->bInterfaceNumber, NULL, 0,
 644                         USB_CTRL_SET_TIMEOUT);
 645         if (result < 0) {
 646                 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
 647                                 req, result);
 648         }
 649
 650         return result;
 651 }
 652
 653 /*
 654  * Writes a variable-sized block of CP210X_ registers, identified by req.
 655  * Data in buf must be in native USB byte order.
 656  */
 657 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
 658                 void *buf, int bufsize)
 659 {
 660         struct usb_serial *serial = port->serial;
 661         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 662         void *dmabuf;
 663         int result;
 664
 665         dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
 666         if (!dmabuf)
 667                 return -ENOMEM;
 668
 669         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 670                         req, REQTYPE_HOST_TO_INTERFACE, 0,
 671                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 672                         USB_CTRL_SET_TIMEOUT);
 673
 674         kfree(dmabuf);
 675
 676         if (result == bufsize) {
 677                 result = 0;
 678         } else {
 679                 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
 680                                 req, bufsize, result);
 681                 if (result >= 0)
 682                         result = -EIO;
 683         }
 684
 685         return result;
 686 }
 687
 688 /*
 689  * Writes any 32-bit CP210X_ register identified by req.
 690  */
 691 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
 692 {
 693         __le32 le32_val;
 694
 695         le32_val = cpu_to_le32(val);
 696
 697         return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
 698 }
 699
 700 #ifdef CONFIG_GPIOLIB
 701 /*
 702  * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
 703  * Data in buf must be in native USB byte order.
 704  */
 705 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
 706                                      u16 val, void *buf, int bufsize)
 707 {
 708         void *dmabuf;
 709         int result;
 710
 711         dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
 712         if (!dmabuf)
 713                 return -ENOMEM;
 714
 715         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 716                                  CP210X_VENDOR_SPECIFIC, type, val,
 717                                  cp210x_interface_num(serial), dmabuf, bufsize,
 718                                  USB_CTRL_SET_TIMEOUT);
 719
 720         kfree(dmabuf);
 721
 722         if (result == bufsize) {
 723                 result = 0;
 724         } else {
 725                 dev_err(&serial->interface->dev,
 726                         "failed to set vendor val 0x%04x size %d: %d\n", val,
 727                         bufsize, result);
 728                 if (result >= 0)
 729                         result = -EIO;
 730         }
 731
 732         return result;
 733 }
 734 #endif
 735
 736 /*
 737  * Detect CP2108 GET_LINE_CTL bug and activate workaround.
 738  * Write a known good value 0x800, read it back.
 739  * If it comes back swapped the bug is detected.
 740  * Preserve the original register value.
 741  */
 742 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
 743 {
 744         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 745         u16 line_ctl_save;
 746         u16 line_ctl_test;
 747         int err;
 748
 749         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
 750         if (err)
 751                 return err;
 752
 753         err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
 754         if (err)
 755                 return err;
 756
 757         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
 758         if (err)
 759                 return err;
 760
 761         if (line_ctl_test == 8) {
 762                 port_priv->has_swapped_line_ctl = true;
 763                 line_ctl_save = swab16(line_ctl_save);
 764         }
 765
 766         return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
 767 }
 768
 769 /*
 770  * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
 771  * to workaround cp2108 bug and get correct value.
 772  */
 773 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
 774 {
 775         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 776         int err;
 777
 778         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
 779         if (err)
 780                 return err;
 781
 782         /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
 783         if (port_priv->has_swapped_line_ctl)
 784                 *ctl = swab16(*ctl);
 785
 786         return 0;
 787 }
 788
 789 /*
 790  * cp210x_quantise_baudrate
 791  * Quantises the baud rate as per AN205 Table 1
 792  */
 793 static unsigned int cp210x_quantise_baudrate(unsigned int baud)
 794 {
 795         if (baud <= 300)
 796                 baud = 300;
 797         else if (baud <= 600)      baud = 600;
 798         else if (baud <= 1200)     baud = 1200;
 799         else if (baud <= 1800)     baud = 1800;
 800         else if (baud <= 2400)     baud = 2400;
 801         else if (baud <= 4000)     baud = 4000;
 802         else if (baud <= 4803)     baud = 4800;
 803         else if (baud <= 7207)     baud = 7200;
 804         else if (baud <= 9612)     baud = 9600;
 805         else if (baud <= 14428)    baud = 14400;
 806         else if (baud <= 16062)    baud = 16000;
 807         else if (baud <= 19250)    baud = 19200;
 808         else if (baud <= 28912)    baud = 28800;
 809         else if (baud <= 38601)    baud = 38400;
 810         else if (baud <= 51558)    baud = 51200;
 811         else if (baud <= 56280)    baud = 56000;
 812         else if (baud <= 58053)    baud = 57600;
 813         else if (baud <= 64111)    baud = 64000;
 814         else if (baud <= 77608)    baud = 76800;
 815         else if (baud <= 117028)   baud = 115200;
 816         else if (baud <= 129347)   baud = 128000;
 817         else if (baud <= 156868)   baud = 153600;
 818         else if (baud <= 237832)   baud = 230400;
 819         else if (baud <= 254234)   baud = 250000;
 820         else if (baud <= 273066)   baud = 256000;
 821         else if (baud <= 491520)   baud = 460800;
 822         else if (baud <= 567138)   baud = 500000;
 823         else if (baud <= 670254)   baud = 576000;
 824         else if (baud < 1000000)
 825                 baud = 921600;
 826         else if (baud > 2000000)
 827                 baud = 2000000;
 828         return baud;
 829 }
 830
 831 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 832 {
 833         int result;
 834
 835         result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
 836         if (result) {
 837                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
 838                 return result;
 839         }
 840
 841         /* Configure the termios structure */
 842         cp210x_get_termios(tty, port);
 843
 844         /* The baud rate must be initialised on cp2104 */
 845         if (tty)
 846                 cp210x_change_speed(tty, port, NULL);
 847
 848         return usb_serial_generic_open(tty, port);
 849 }
 850
 851 static void cp210x_close(struct usb_serial_port *port)
 852 {
 853         usb_serial_generic_close(port);
 854
 855         /* Clear both queues; cp2108 needs this to avoid an occasional hang */
 856         cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
 857
 858         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 859 }
 860
 861 /*
 862  * Read how many bytes are waiting in the TX queue.
 863  */
 864 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
 865                 u32 *count)
 866 {
 867         struct usb_serial *serial = port->serial;
 868         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 869         struct cp210x_comm_status *sts;
 870         int result;
 871
 872         sts = kmalloc(sizeof(*sts), GFP_KERNEL);
 873         if (!sts)
 874                 return -ENOMEM;
 875
 876         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 877                         CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
 878                         0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
 879                         USB_CTRL_GET_TIMEOUT);
 880         if (result == sizeof(*sts)) {
 881                 *count = le32_to_cpu(sts->ulAmountInOutQueue);
 882                 result = 0;
 883         } else {
 884                 dev_err(&port->dev, "failed to get comm status: %d\n", result);
 885                 if (result >= 0)
 886                         result = -EIO;
 887         }
 888
 889         kfree(sts);
 890
 891         return result;
 892 }
 893
 894 static bool cp210x_tx_empty(struct usb_serial_port *port)
 895 {
 896         int err;
 897         u32 count;
 898
 899         err = cp210x_get_tx_queue_byte_count(port, &count);
 900         if (err)
 901                 return true;
 902
 903         return !count;
 904 }
 905
 906 /*
 907  * cp210x_get_termios
 908  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 909  * from the device, corrects any unsupported values, and configures the
 910  * termios structure to reflect the state of the device
 911  */
 912 static void cp210x_get_termios(struct tty_struct *tty,
 913         struct usb_serial_port *port)
 914 {
 915         unsigned int baud;
 916
 917         if (tty) {
 918                 cp210x_get_termios_port(tty->driver_data,
 919                         &tty->termios.c_cflag, &baud);
 920                 tty_encode_baud_rate(tty, baud, baud);
 921         } else {
 922                 tcflag_t cflag;
 923                 cflag = 0;
 924                 cp210x_get_termios_port(port, &cflag, &baud);
 925         }
 926 }
 927
 928 /*
 929  * cp210x_get_termios_port
 930  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
 931  */
 932 static void cp210x_get_termios_port(struct usb_serial_port *port,
 933         tcflag_t *cflagp, unsigned int *baudp)
 934 {
 935         struct device *dev = &port->dev;
 936         tcflag_t cflag;
 937         struct cp210x_flow_ctl flow_ctl;
 938         u32 baud;
 939         u16 bits;
 940         u32 ctl_hs;
 941         u32 flow_repl;
 942
 943         cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
 944
 945         dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
 946         *baudp = baud;
 947
 948         cflag = *cflagp;
 949
 950         cp210x_get_line_ctl(port, &bits);
 951         cflag &= ~CSIZE;
 952         switch (bits & BITS_DATA_MASK) {
 953         case BITS_DATA_5:
 954                 dev_dbg(dev, "%s - data bits = 5\n", __func__);
 955                 cflag |= CS5;
 956                 break;
 957         case BITS_DATA_6:
 958                 dev_dbg(dev, "%s - data bits = 6\n", __func__);
 959                 cflag |= CS6;
 960                 break;
 961         case BITS_DATA_7:
 962                 dev_dbg(dev, "%s - data bits = 7\n", __func__);
 963                 cflag |= CS7;
 964                 break;
 965         case BITS_DATA_8:
 966                 dev_dbg(dev, "%s - data bits = 8\n", __func__);
 967                 cflag |= CS8;
 968                 break;
 969         case BITS_DATA_9:
 970                 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
 971                 cflag |= CS8;
 972                 bits &= ~BITS_DATA_MASK;
 973                 bits |= BITS_DATA_8;
 974                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 975                 break;
 976         default:
 977                 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
 978                 cflag |= CS8;
 979                 bits &= ~BITS_DATA_MASK;
 980                 bits |= BITS_DATA_8;
 981                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 982                 break;
 983         }
 984
 985         switch (bits & BITS_PARITY_MASK) {
 986         case BITS_PARITY_NONE:
 987                 dev_dbg(dev, "%s - parity = NONE\n", __func__);
 988                 cflag &= ~PARENB;
 989                 break;
 990         case BITS_PARITY_ODD:
 991                 dev_dbg(dev, "%s - parity = ODD\n", __func__);
 992                 cflag |= (PARENB|PARODD);
 993                 break;
 994         case BITS_PARITY_EVEN:
 995                 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
 996                 cflag &= ~PARODD;
 997                 cflag |= PARENB;
 998                 break;
 999         case BITS_PARITY_MARK:
1000                 dev_dbg(dev, "%s - parity = MARK\n", __func__);
1001                 cflag |= (PARENB|PARODD|CMSPAR);
1002                 break;
1003         case BITS_PARITY_SPACE:
1004                 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1005                 cflag &= ~PARODD;
1006                 cflag |= (PARENB|CMSPAR);
1007                 break;
1008         default:
1009                 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
1010                 cflag &= ~PARENB;
1011                 bits &= ~BITS_PARITY_MASK;
1012                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1013                 break;
1014         }
1015
1016         cflag &= ~CSTOPB;
1017         switch (bits & BITS_STOP_MASK) {
1018         case BITS_STOP_1:
1019                 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1020                 break;
1021         case BITS_STOP_1_5:
1022                 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
1023                 bits &= ~BITS_STOP_MASK;
1024                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1025                 break;
1026         case BITS_STOP_2:
1027                 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1028                 cflag |= CSTOPB;
1029                 break;
1030         default:
1031                 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
1032                 bits &= ~BITS_STOP_MASK;
1033                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1034                 break;
1035         }
1036
1037         cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1038                         sizeof(flow_ctl));
1039         ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1040         if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
1041                 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1042                 /*
1043                  * When the port is closed, the CP210x hardware disables
1044                  * auto-RTS and RTS is deasserted but it leaves auto-CTS when
1045                  * in hardware flow control mode. When re-opening the port, if
1046                  * auto-CTS is enabled on the cp210x, then auto-RTS must be
1047                  * re-enabled in the driver.
1048                  */
1049                 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1050                 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1051                 flow_repl |= CP210X_SERIAL_RTS_SHIFT(CP210X_SERIAL_RTS_FLOW_CTL);
1052                 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1053                 cp210x_write_reg_block(port,
1054                                 CP210X_SET_FLOW,
1055                                 &flow_ctl,
1056                                 sizeof(flow_ctl));
1057
1058                 cflag |= CRTSCTS;
1059         } else {
1060                 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1061                 cflag &= ~CRTSCTS;
1062         }
1063
1064         *cflagp = cflag;
1065 }
1066
1067 /*
1068  * CP2101 supports the following baud rates:
1069  *
1070  *      300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1071  *      38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1072  *
1073  * CP2102 and CP2103 support the following additional rates:
1074  *
1075  *      4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1076  *      576000
1077  *
1078  * The device will map a requested rate to a supported one, but the result
1079  * of requests for rates greater than 1053257 is undefined (see AN205).
1080  *
1081  * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1082  * respectively, with an error less than 1%. The actual rates are determined
1083  * by
1084  *
1085  *      div = round(freq / (2 x prescale x request))
1086  *      actual = freq / (2 x prescale x div)
1087  *
1088  * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1089  * or 1 otherwise.
1090  * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1091  * otherwise.
1092  */
1093 static void cp210x_change_speed(struct tty_struct *tty,
1094                 struct usb_serial_port *port, struct ktermios *old_termios)
1095 {
1096         u32 baud;
1097
1098         baud = tty->termios.c_ospeed;
1099
1100         /* This maps the requested rate to a rate valid on cp2102 or cp2103,
1101          * or to an arbitrary rate in [1M,2M].
1102          *
1103          * NOTE: B0 is not implemented.
1104          */
1105         baud = cp210x_quantise_baudrate(baud);
1106
1107         dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1108         if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1109                 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1110                 if (old_termios)
1111                         baud = old_termios->c_ospeed;
1112                 else
1113                         baud = 9600;
1114         }
1115
1116         tty_encode_baud_rate(tty, baud, baud);
1117 }
1118
1119 static void cp210x_set_termios(struct tty_struct *tty,
1120                 struct usb_serial_port *port, struct ktermios *old_termios)
1121 {
1122         struct device *dev = &port->dev;
1123         unsigned int cflag, old_cflag;
1124         u16 bits;
1125
1126         cflag = tty->termios.c_cflag;
1127         old_cflag = old_termios->c_cflag;
1128
1129         if (tty->termios.c_ospeed != old_termios->c_ospeed)
1130                 cp210x_change_speed(tty, port, old_termios);
1131
1132         /* If the number of data bits is to be updated */
1133         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
1134                 cp210x_get_line_ctl(port, &bits);
1135                 bits &= ~BITS_DATA_MASK;
1136                 switch (cflag & CSIZE) {
1137                 case CS5:
1138                         bits |= BITS_DATA_5;
1139                         dev_dbg(dev, "%s - data bits = 5\n", __func__);
1140                         break;
1141                 case CS6:
1142                         bits |= BITS_DATA_6;
1143                         dev_dbg(dev, "%s - data bits = 6\n", __func__);
1144                         break;
1145                 case CS7:
1146                         bits |= BITS_DATA_7;
1147                         dev_dbg(dev, "%s - data bits = 7\n", __func__);
1148                         break;
1149                 case CS8:
1150                 default:
1151                         bits |= BITS_DATA_8;
1152                         dev_dbg(dev, "%s - data bits = 8\n", __func__);
1153                         break;
1154                 }
1155                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1156                         dev_dbg(dev, "Number of data bits requested not supported by device\n");
1157         }
1158
1159         if ((cflag     & (PARENB|PARODD|CMSPAR)) !=
1160             (old_cflag & (PARENB|PARODD|CMSPAR))) {
1161                 cp210x_get_line_ctl(port, &bits);
1162                 bits &= ~BITS_PARITY_MASK;
1163                 if (cflag & PARENB) {
1164                         if (cflag & CMSPAR) {
1165                                 if (cflag & PARODD) {
1166                                         bits |= BITS_PARITY_MARK;
1167                                         dev_dbg(dev, "%s - parity = MARK\n", __func__);
1168                                 } else {
1169                                         bits |= BITS_PARITY_SPACE;
1170                                         dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1171                                 }
1172                         } else {
1173                                 if (cflag & PARODD) {
1174                                         bits |= BITS_PARITY_ODD;
1175                                         dev_dbg(dev, "%s - parity = ODD\n", __func__);
1176                                 } else {
1177                                         bits |= BITS_PARITY_EVEN;
1178                                         dev_dbg(dev, "%s - parity = EVEN\n", __func__);
1179                                 }
1180                         }
1181                 }
1182                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1183                         dev_dbg(dev, "Parity mode not supported by device\n");
1184         }
1185
1186         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
1187                 cp210x_get_line_ctl(port, &bits);
1188                 bits &= ~BITS_STOP_MASK;
1189                 if (cflag & CSTOPB) {
1190                         bits |= BITS_STOP_2;
1191                         dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1192                 } else {
1193                         bits |= BITS_STOP_1;
1194                         dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1195                 }
1196                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1197                         dev_dbg(dev, "Number of stop bits requested not supported by device\n");
1198         }
1199
1200         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
1201                 struct cp210x_flow_ctl flow_ctl;
1202                 u32 ctl_hs;
1203                 u32 flow_repl;
1204
1205                 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1206                                 sizeof(flow_ctl));
1207                 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1208                 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1209                 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1210                                 __func__, ctl_hs, flow_repl);
1211
1212                 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1213                 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1214                 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1215                 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1216                 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1217                 if (cflag & CRTSCTS) {
1218                         ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1219
1220                         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1221                         flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1222                                         CP210X_SERIAL_RTS_FLOW_CTL);
1223                         dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1224                 } else {
1225                         ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1226
1227                         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1228                         flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1229                                         CP210X_SERIAL_RTS_ACTIVE);
1230                         dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1231                 }
1232
1233                 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1234                                 __func__, ctl_hs, flow_repl);
1235                 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1236                 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1237                 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1238                                 sizeof(flow_ctl));
1239         }
1240
1241 }
1242
1243 static int cp210x_tiocmset(struct tty_struct *tty,
1244                 unsigned int set, unsigned int clear)
1245 {
1246         struct usb_serial_port *port = tty->driver_data;
1247         return cp210x_tiocmset_port(port, set, clear);
1248 }
1249
1250 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1251                 unsigned int set, unsigned int clear)
1252 {
1253         u16 control = 0;
1254
1255         if (set & TIOCM_RTS) {
1256                 control |= CONTROL_RTS;
1257                 control |= CONTROL_WRITE_RTS;
1258         }
1259         if (set & TIOCM_DTR) {
1260                 control |= CONTROL_DTR;
1261                 control |= CONTROL_WRITE_DTR;
1262         }
1263         if (clear & TIOCM_RTS) {
1264                 control &= ~CONTROL_RTS;
1265                 control |= CONTROL_WRITE_RTS;
1266         }
1267         if (clear & TIOCM_DTR) {
1268                 control &= ~CONTROL_DTR;
1269                 control |= CONTROL_WRITE_DTR;
1270         }
1271
1272         dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1273
1274         return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1275 }
1276
1277 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1278 {
1279         if (on)
1280                 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1281         else
1282                 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1283 }
1284
1285 static int cp210x_tiocmget(struct tty_struct *tty)
1286 {
1287         struct usb_serial_port *port = tty->driver_data;
1288         u8 control;
1289         int result;
1290
1291         result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1292         if (result)
1293                 return result;
1294
1295         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1296                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1297                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1298                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1299                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
1300                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
1301
1302         dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1303
1304         return result;
1305 }
1306
1307 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1308 {
1309         struct usb_serial_port *port = tty->driver_data;
1310         u16 state;
1311
1312         if (break_state == 0)
1313                 state = BREAK_OFF;
1314         else
1315                 state = BREAK_ON;
1316         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1317                 state == BREAK_OFF ? "off" : "on");
1318         cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1319 }
1320
1321 #ifdef CONFIG_GPIOLIB
1322 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset)
1323 {
1324         struct usb_serial *serial = gpiochip_get_data(gc);
1325         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1326
1327         switch (offset) {
1328         case 0:
1329                 if (priv->config & CP2105_GPIO0_TXLED_MODE)
1330                         return -ENODEV;
1331                 break;
1332         case 1:
1333                 if (priv->config & (CP2105_GPIO1_RXLED_MODE |
1334                                     CP2105_GPIO1_RS485_MODE))
1335                         return -ENODEV;
1336                 break;
1337         }
1338
1339         return 0;
1340 }
1341
1342 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1343 {
1344         struct usb_serial *serial = gpiochip_get_data(gc);
1345         int result;
1346         u8 buf;
1347
1348         result = cp210x_read_vendor_block(serial, REQTYPE_INTERFACE_TO_HOST,
1349                                           CP210X_READ_LATCH, &buf, sizeof(buf));
1350         if (result < 0)
1351                 return result;
1352
1353         return !!(buf & BIT(gpio));
1354 }
1355
1356 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1357 {
1358         struct usb_serial *serial = gpiochip_get_data(gc);
1359         struct cp210x_gpio_write buf;
1360
1361         if (value == 1)
1362                 buf.state = BIT(gpio);
1363         else
1364                 buf.state = 0;
1365
1366         buf.mask = BIT(gpio);
1367
1368         cp210x_write_vendor_block(serial, REQTYPE_HOST_TO_INTERFACE,
1369                                   CP210X_WRITE_LATCH, &buf, sizeof(buf));
1370 }
1371
1372 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1373 {
1374         /* Hardware does not support an input mode */
1375         return 0;
1376 }
1377
1378 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1379 {
1380         /* Hardware does not support an input mode */
1381         return -ENOTSUPP;
1382 }
1383
1384 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1385                                         int value)
1386 {
1387         return 0;
1388 }
1389
1390 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1391                                   unsigned long config)
1392 {
1393         struct usb_serial *serial = gpiochip_get_data(gc);
1394         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1395         enum pin_config_param param = pinconf_to_config_param(config);
1396
1397         /* Succeed only if in correct mode (this can't be set at runtime) */
1398         if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1399             (priv->gpio_mode & BIT(gpio)))
1400                 return 0;
1401
1402         if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1403             !(priv->gpio_mode & BIT(gpio)))
1404                 return 0;
1405
1406         return -ENOTSUPP;
1407 }
1408
1409 /*
1410  * This function is for configuring GPIO using shared pins, where other signals
1411  * are made unavailable by configuring the use of GPIO. This is believed to be
1412  * only applicable to the cp2105 at this point, the other devices supported by
1413  * this driver that provide GPIO do so in a way that does not impact other
1414  * signals and are thus expected to have very different initialisation.
1415  */
1416 static int cp2105_shared_gpio_init(struct usb_serial *serial)
1417 {
1418         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1419         struct cp210x_pin_mode mode;
1420         struct cp210x_config config;
1421         u8 intf_num = cp210x_interface_num(serial);
1422         int result;
1423
1424         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1425                                           CP210X_GET_DEVICEMODE, &mode,
1426                                           sizeof(mode));
1427         if (result < 0)
1428                 return result;
1429
1430         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1431                                           CP210X_GET_PORTCONFIG, &config,
1432                                           sizeof(config));
1433         if (result < 0)
1434                 return result;
1435
1436         /*  2 banks of GPIO - One for the pins taken from each serial port */
1437         if (intf_num == 0) {
1438                 if (mode.eci == CP210X_PIN_MODE_MODEM)
1439                         return 0;
1440
1441                 priv->config = config.eci_cfg;
1442                 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
1443                                                 CP210X_ECI_GPIO_MODE_MASK) >>
1444                                                 CP210X_ECI_GPIO_MODE_OFFSET);
1445                 priv->gc.ngpio = 2;
1446         } else if (intf_num == 1) {
1447                 if (mode.sci == CP210X_PIN_MODE_MODEM)
1448                         return 0;
1449
1450                 priv->config = config.sci_cfg;
1451                 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
1452                                                 CP210X_SCI_GPIO_MODE_MASK) >>
1453                                                 CP210X_SCI_GPIO_MODE_OFFSET);
1454                 priv->gc.ngpio = 3;
1455         } else {
1456                 return -ENODEV;
1457         }
1458
1459         priv->gc.label = "cp210x";
1460         priv->gc.request = cp210x_gpio_request;
1461         priv->gc.get_direction = cp210x_gpio_direction_get;
1462         priv->gc.direction_input = cp210x_gpio_direction_input;
1463         priv->gc.direction_output = cp210x_gpio_direction_output;
1464         priv->gc.get = cp210x_gpio_get;
1465         priv->gc.set = cp210x_gpio_set;
1466         priv->gc.set_config = cp210x_gpio_set_config;
1467         priv->gc.owner = THIS_MODULE;
1468         priv->gc.parent = &serial->interface->dev;
1469         priv->gc.base = -1;
1470         priv->gc.can_sleep = true;
1471
1472         result = gpiochip_add_data(&priv->gc, serial);
1473         if (!result)
1474                 priv->gpio_registered = true;
1475
1476         return result;
1477 }
1478
1479 static void cp210x_gpio_remove(struct usb_serial *serial)
1480 {
1481         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1482
1483         if (priv->gpio_registered) {
1484                 gpiochip_remove(&priv->gc);
1485                 priv->gpio_registered = false;
1486         }
1487 }
1488
1489 #else
1490
1491 static int cp2105_shared_gpio_init(struct usb_serial *serial)
1492 {
1493         return 0;
1494 }
1495
1496 static void cp210x_gpio_remove(struct usb_serial *serial)
1497 {
1498         /* Nothing to do */
1499 }
1500
1501 #endif
1502
1503 static int cp210x_port_probe(struct usb_serial_port *port)
1504 {
1505         struct usb_serial *serial = port->serial;
1506         struct cp210x_port_private *port_priv;
1507         int ret;
1508
1509         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1510         if (!port_priv)
1511                 return -ENOMEM;
1512
1513         port_priv->bInterfaceNumber = cp210x_interface_num(serial);
1514
1515         usb_set_serial_port_data(port, port_priv);
1516
1517         ret = cp210x_detect_swapped_line_ctl(port);
1518         if (ret) {
1519                 kfree(port_priv);
1520                 return ret;
1521         }
1522
1523         return 0;
1524 }
1525
1526 static int cp210x_port_remove(struct usb_serial_port *port)
1527 {
1528         struct cp210x_port_private *port_priv;
1529
1530         port_priv = usb_get_serial_port_data(port);
1531         kfree(port_priv);
1532
1533         return 0;
1534 }
1535
1536 static int cp210x_attach(struct usb_serial *serial)
1537 {
1538         int result;
1539         struct cp210x_serial_private *priv;
1540
1541         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1542         if (!priv)
1543                 return -ENOMEM;
1544
1545         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1546                                           CP210X_GET_PARTNUM, &priv->partnum,
1547                                           sizeof(priv->partnum));
1548         if (result < 0) {
1549                 dev_warn(&serial->interface->dev,
1550                          "querying part number failed\n");
1551                 priv->partnum = CP210X_PARTNUM_UNKNOWN;
1552         }
1553
1554         usb_set_serial_data(serial, priv);
1555
1556         if (priv->partnum == CP210X_PARTNUM_CP2105) {
1557                 result = cp2105_shared_gpio_init(serial);
1558                 if (result < 0) {
1559                         dev_err(&serial->interface->dev,
1560                                 "GPIO initialisation failed, continuing without GPIO support\n");
1561                 }
1562         }
1563
1564         return 0;
1565 }
1566
1567 static void cp210x_disconnect(struct usb_serial *serial)
1568 {
1569         cp210x_gpio_remove(serial);
1570 }
1571
1572 static void cp210x_release(struct usb_serial *serial)
1573 {
1574         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1575
1576         cp210x_gpio_remove(serial);
1577
1578         kfree(priv);
1579 }
1580
1581 module_usb_serial_driver(serial_drivers, id_table);
1582
1583 MODULE_DESCRIPTION(DRIVER_DESC);
1584 MODULE_LICENSE("GPL");