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
  27 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
  28
  29 /*
  30  * Function Prototypes
  31  */
  32 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
  33 static void cp210x_close(struct usb_serial_port *);
  34 static void cp210x_get_termios(struct tty_struct *, struct usb_serial_port *);
  35 static void cp210x_get_termios_port(struct usb_serial_port *port,
  36         tcflag_t *cflagp, unsigned int *baudp);
  37 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
  38                                                         struct ktermios *);
  39 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
  40                                                         struct ktermios*);
  41 static bool cp210x_tx_empty(struct usb_serial_port *port);
  42 static int cp210x_tiocmget(struct tty_struct *);
  43 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
  44 static int cp210x_tiocmset_port(struct usb_serial_port *port,
  45                 unsigned int, unsigned int);
  46 static void cp210x_break_ctl(struct tty_struct *, int);
  47 static int cp210x_port_probe(struct usb_serial_port *);
  48 static int cp210x_port_remove(struct usb_serial_port *);
  49 static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
  50
  51 static const struct usb_device_id id_table[] = {
  52         { USB_DEVICE(0x0404, 0x034C) }, /* NCR Retail IO Box */
  53         { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
  54         { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
  55         { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  56         { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  57         { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
  58         { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
  59         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
  60         { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
  61         { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
  62         { USB_DEVICE(0x0988, 0x0578) }, /* Teraoka AD2000 */
  63         { USB_DEVICE(0x0B00, 0x3070) }, /* Ingenico 3070 */
  64         { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
  65         { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
  66         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  67         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
  68         { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
  69         { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
  70         { USB_DEVICE(0x106F, 0x0003) }, /* CPI / Money Controls Bulk Coin Recycler */
  71         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  72         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  73         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  74         { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
  75         { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
  76         { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
  77         { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
  78         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  79         { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
  80         { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
  81         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
  82         { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
  83         { USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */
  84         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  85         { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
  86         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  87         { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
  88         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  89         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
  90         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  91         { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
  92         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  93         { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
  94         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
  95         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
  96         { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
  97         { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
  98         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
  99         { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
 100         { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */
 101         { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */
 102         { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */
 103         { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
 104         { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
 105         { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
 106         { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
 107         { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
 108         { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
 109         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
 110         { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
 111         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
 112         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
 113         { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
 114         { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
 115         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
 116         { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
 117         { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
 118         { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
 119         { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
 120         { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */
 121         { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */
 122         { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */
 123         { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
 124         { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
 125         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
 126         { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
 127         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
 128         { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */
 129         { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
 130         { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
 131         { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
 132         { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
 133         { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
 134         { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
 135         { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
 136         { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */
 137         { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */
 138         { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */
 139         { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
 140         { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
 141         { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
 142         { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
 143         { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
 144         { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
 145         { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
 146         { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
 147         { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
 148         { USB_DEVICE(0x10C4, 0x88D8) }, /* Acuity Brands nLight Air Adapter */
 149         { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */
 150         { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */
 151         { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
 152         { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
 153         { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
 154         { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
 155         { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */
 156         { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */
 157         { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
 158         { USB_DEVICE(0x10C4, 0x8A5B) }, /* CEL EM3588 ZigBee USB Stick */
 159         { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
 160         { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
 161         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 162         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 163         { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */
 164         { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
 165         { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
 166         { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */
 167         { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */
 168         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 169         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 170         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 171         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 172         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 173         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 174         { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
 175         { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
 176         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 177         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 178         { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */
 179         { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
 180         { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
 181         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 182         { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
 183         { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
 184         { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
 185         { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
 186         { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
 187         { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
 188         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 189         { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
 190         { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
 191         { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
 192         { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
 193         { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
 194         { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
 195         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
 196         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
 197         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 198         { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
 199         { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
 200         { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
 201         { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
 202         { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
 203         { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
 204         { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
 205         { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
 206         { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 M.2 Key E serial interface */
 207         { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 Display serial interface */
 208         { USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */
 209         { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
 210         { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
 211         { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
 212         { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
 213         { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
 214         { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
 215         { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
 216         { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
 217         { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
 218         { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
 219         { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
 220         { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
 221         { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
 222         { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
 223         { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
 224         { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
 225         { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
 226         { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
 227         { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
 228         { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
 229         { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
 230         { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
 231         { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
 232         { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
 233         { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
 234         { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
 235         { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
 236         { USB_DEVICE(0x2184, 0x0030) }, /* GW Instek GDM-834x Digital Multimeter */
 237         { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
 238         { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
 239         { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
 240         { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
 241         { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
 242         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 243         { } /* Terminating Entry */
 244 };
 245
 246 MODULE_DEVICE_TABLE(usb, id_table);
 247
 248 struct cp210x_port_private {
 249         __u8                    bInterfaceNumber;
 250         bool                    has_swapped_line_ctl;
 251 };
 252
 253 static struct usb_serial_driver cp210x_device = {
 254         .driver = {
 255                 .owner =        THIS_MODULE,
 256                 .name =         "cp210x",
 257         },
 258         .id_table               = id_table,
 259         .num_ports              = 1,
 260         .bulk_in_size           = 256,
 261         .bulk_out_size          = 256,
 262         .open                   = cp210x_open,
 263         .close                  = cp210x_close,
 264         .break_ctl              = cp210x_break_ctl,
 265         .set_termios            = cp210x_set_termios,
 266         .tx_empty               = cp210x_tx_empty,
 267         .throttle               = usb_serial_generic_throttle,
 268         .unthrottle             = usb_serial_generic_unthrottle,
 269         .tiocmget               = cp210x_tiocmget,
 270         .tiocmset               = cp210x_tiocmset,
 271         .port_probe             = cp210x_port_probe,
 272         .port_remove            = cp210x_port_remove,
 273         .dtr_rts                = cp210x_dtr_rts
 274 };
 275
 276 static struct usb_serial_driver * const serial_drivers[] = {
 277         &cp210x_device, NULL
 278 };
 279
 280 /* Config request types */
 281 #define REQTYPE_HOST_TO_INTERFACE       0x41
 282 #define REQTYPE_INTERFACE_TO_HOST       0xc1
 283 #define REQTYPE_HOST_TO_DEVICE  0x40
 284 #define REQTYPE_DEVICE_TO_HOST  0xc0
 285
 286 /* Config request codes */
 287 #define CP210X_IFC_ENABLE       0x00
 288 #define CP210X_SET_BAUDDIV      0x01
 289 #define CP210X_GET_BAUDDIV      0x02
 290 #define CP210X_SET_LINE_CTL     0x03
 291 #define CP210X_GET_LINE_CTL     0x04
 292 #define CP210X_SET_BREAK        0x05
 293 #define CP210X_IMM_CHAR         0x06
 294 #define CP210X_SET_MHS          0x07
 295 #define CP210X_GET_MDMSTS       0x08
 296 #define CP210X_SET_XON          0x09
 297 #define CP210X_SET_XOFF         0x0A
 298 #define CP210X_SET_EVENTMASK    0x0B
 299 #define CP210X_GET_EVENTMASK    0x0C
 300 #define CP210X_SET_CHAR         0x0D
 301 #define CP210X_GET_CHARS        0x0E
 302 #define CP210X_GET_PROPS        0x0F
 303 #define CP210X_GET_COMM_STATUS  0x10
 304 #define CP210X_RESET            0x11
 305 #define CP210X_PURGE            0x12
 306 #define CP210X_SET_FLOW         0x13
 307 #define CP210X_GET_FLOW         0x14
 308 #define CP210X_EMBED_EVENTS     0x15
 309 #define CP210X_GET_EVENTSTATE   0x16
 310 #define CP210X_SET_CHARS        0x19
 311 #define CP210X_GET_BAUDRATE     0x1D
 312 #define CP210X_SET_BAUDRATE     0x1E
 313
 314 /* CP210X_IFC_ENABLE */
 315 #define UART_ENABLE             0x0001
 316 #define UART_DISABLE            0x0000
 317
 318 /* CP210X_(SET|GET)_BAUDDIV */
 319 #define BAUD_RATE_GEN_FREQ      0x384000
 320
 321 /* CP210X_(SET|GET)_LINE_CTL */
 322 #define BITS_DATA_MASK          0X0f00
 323 #define BITS_DATA_5             0X0500
 324 #define BITS_DATA_6             0X0600
 325 #define BITS_DATA_7             0X0700
 326 #define BITS_DATA_8             0X0800
 327 #define BITS_DATA_9             0X0900
 328
 329 #define BITS_PARITY_MASK        0x00f0
 330 #define BITS_PARITY_NONE        0x0000
 331 #define BITS_PARITY_ODD         0x0010
 332 #define BITS_PARITY_EVEN        0x0020
 333 #define BITS_PARITY_MARK        0x0030
 334 #define BITS_PARITY_SPACE       0x0040
 335
 336 #define BITS_STOP_MASK          0x000f
 337 #define BITS_STOP_1             0x0000
 338 #define BITS_STOP_1_5           0x0001
 339 #define BITS_STOP_2             0x0002
 340
 341 /* CP210X_SET_BREAK */
 342 #define BREAK_ON                0x0001
 343 #define BREAK_OFF               0x0000
 344
 345 /* CP210X_(SET_MHS|GET_MDMSTS) */
 346 #define CONTROL_DTR             0x0001
 347 #define CONTROL_RTS             0x0002
 348 #define CONTROL_CTS             0x0010
 349 #define CONTROL_DSR             0x0020
 350 #define CONTROL_RING            0x0040
 351 #define CONTROL_DCD             0x0080
 352 #define CONTROL_WRITE_DTR       0x0100
 353 #define CONTROL_WRITE_RTS       0x0200
 354
 355 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
 356 struct cp210x_comm_status {
 357         __le32   ulErrors;
 358         __le32   ulHoldReasons;
 359         __le32   ulAmountInInQueue;
 360         __le32   ulAmountInOutQueue;
 361         u8       bEofReceived;
 362         u8       bWaitForImmediate;
 363         u8       bReserved;
 364 } __packed;
 365
 366 /*
 367  * CP210X_PURGE - 16 bits passed in wValue of USB request.
 368  * SiLabs app note AN571 gives a strange description of the 4 bits:
 369  * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
 370  * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
 371  */
 372 #define PURGE_ALL               0x000f
 373
 374 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
 375 struct cp210x_flow_ctl {
 376         __le32  ulControlHandshake;
 377         __le32  ulFlowReplace;
 378         __le32  ulXonLimit;
 379         __le32  ulXoffLimit;
 380 } __packed;
 381
 382 /* cp210x_flow_ctl::ulControlHandshake */
 383 #define CP210X_SERIAL_DTR_MASK          GENMASK(1, 0)
 384 #define CP210X_SERIAL_DTR_SHIFT(_mode)  (_mode)
 385 #define CP210X_SERIAL_CTS_HANDSHAKE     BIT(3)
 386 #define CP210X_SERIAL_DSR_HANDSHAKE     BIT(4)
 387 #define CP210X_SERIAL_DCD_HANDSHAKE     BIT(5)
 388 #define CP210X_SERIAL_DSR_SENSITIVITY   BIT(6)
 389
 390 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
 391 #define CP210X_SERIAL_DTR_INACTIVE      0
 392 #define CP210X_SERIAL_DTR_ACTIVE        1
 393 #define CP210X_SERIAL_DTR_FLOW_CTL      2
 394
 395 /* cp210x_flow_ctl::ulFlowReplace */
 396 #define CP210X_SERIAL_AUTO_TRANSMIT     BIT(0)
 397 #define CP210X_SERIAL_AUTO_RECEIVE      BIT(1)
 398 #define CP210X_SERIAL_ERROR_CHAR        BIT(2)
 399 #define CP210X_SERIAL_NULL_STRIPPING    BIT(3)
 400 #define CP210X_SERIAL_BREAK_CHAR        BIT(4)
 401 #define CP210X_SERIAL_RTS_MASK          GENMASK(7, 6)
 402 #define CP210X_SERIAL_RTS_SHIFT(_mode)  (_mode << 6)
 403 #define CP210X_SERIAL_XOFF_CONTINUE     BIT(31)
 404
 405 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
 406 #define CP210X_SERIAL_RTS_INACTIVE      0
 407 #define CP210X_SERIAL_RTS_ACTIVE        1
 408 #define CP210X_SERIAL_RTS_FLOW_CTL      2
 409
 410 /*
 411  * Reads a variable-sized block of CP210X_ registers, identified by req.
 412  * Returns data into buf in native USB byte order.
 413  */
 414 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
 415                 void *buf, int bufsize)
 416 {
 417         struct usb_serial *serial = port->serial;
 418         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 419         void *dmabuf;
 420         int result;
 421
 422         dmabuf = kmalloc(bufsize, GFP_KERNEL);
 423         if (!dmabuf) {
 424                 /*
 425                  * FIXME Some callers don't bother to check for error,
 426                  * at least give them consistent junk until they are fixed
 427                  */
 428                 memset(buf, 0, bufsize);
 429                 return -ENOMEM;
 430         }
 431
 432         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 433                         req, REQTYPE_INTERFACE_TO_HOST, 0,
 434                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 435                         USB_CTRL_SET_TIMEOUT);
 436         if (result == bufsize) {
 437                 memcpy(buf, dmabuf, bufsize);
 438                 result = 0;
 439         } else {
 440                 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
 441                                 req, bufsize, result);
 442                 if (result >= 0)
 443                         result = -EPROTO;
 444
 445                 /*
 446                  * FIXME Some callers don't bother to check for error,
 447                  * at least give them consistent junk until they are fixed
 448                  */
 449                 memset(buf, 0, bufsize);
 450         }
 451
 452         kfree(dmabuf);
 453
 454         return result;
 455 }
 456
 457 /*
 458  * Reads any 32-bit CP210X_ register identified by req.
 459  */
 460 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
 461 {
 462         __le32 le32_val;
 463         int err;
 464
 465         err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
 466         if (err) {
 467                 /*
 468                  * FIXME Some callers don't bother to check for error,
 469                  * at least give them consistent junk until they are fixed
 470                  */
 471                 *val = 0;
 472                 return err;
 473         }
 474
 475         *val = le32_to_cpu(le32_val);
 476
 477         return 0;
 478 }
 479
 480 /*
 481  * Reads any 16-bit CP210X_ register identified by req.
 482  */
 483 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
 484 {
 485         __le16 le16_val;
 486         int err;
 487
 488         err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
 489         if (err)
 490                 return err;
 491
 492         *val = le16_to_cpu(le16_val);
 493
 494         return 0;
 495 }
 496
 497 /*
 498  * Reads any 8-bit CP210X_ register identified by req.
 499  */
 500 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
 501 {
 502         return cp210x_read_reg_block(port, req, val, sizeof(*val));
 503 }
 504
 505 /*
 506  * Writes any 16-bit CP210X_ register (req) whose value is passed
 507  * entirely in the wValue field of the USB request.
 508  */
 509 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
 510 {
 511         struct usb_serial *serial = port->serial;
 512         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 513         int result;
 514
 515         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 516                         req, REQTYPE_HOST_TO_INTERFACE, val,
 517                         port_priv->bInterfaceNumber, NULL, 0,
 518                         USB_CTRL_SET_TIMEOUT);
 519         if (result < 0) {
 520                 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
 521                                 req, result);
 522         }
 523
 524         return result;
 525 }
 526
 527 /*
 528  * Writes a variable-sized block of CP210X_ registers, identified by req.
 529  * Data in buf must be in native USB byte order.
 530  */
 531 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
 532                 void *buf, int bufsize)
 533 {
 534         struct usb_serial *serial = port->serial;
 535         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 536         void *dmabuf;
 537         int result;
 538
 539         dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
 540         if (!dmabuf)
 541                 return -ENOMEM;
 542
 543         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 544                         req, REQTYPE_HOST_TO_INTERFACE, 0,
 545                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 546                         USB_CTRL_SET_TIMEOUT);
 547
 548         kfree(dmabuf);
 549
 550         if (result == bufsize) {
 551                 result = 0;
 552         } else {
 553                 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
 554                                 req, bufsize, result);
 555                 if (result >= 0)
 556                         result = -EPROTO;
 557         }
 558
 559         return result;
 560 }
 561
 562 /*
 563  * Writes any 32-bit CP210X_ register identified by req.
 564  */
 565 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
 566 {
 567         __le32 le32_val;
 568
 569         le32_val = cpu_to_le32(val);
 570
 571         return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
 572 }
 573
 574 /*
 575  * Detect CP2108 GET_LINE_CTL bug and activate workaround.
 576  * Write a known good value 0x800, read it back.
 577  * If it comes back swapped the bug is detected.
 578  * Preserve the original register value.
 579  */
 580 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
 581 {
 582         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 583         u16 line_ctl_save;
 584         u16 line_ctl_test;
 585         int err;
 586
 587         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
 588         if (err)
 589                 return err;
 590
 591         err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
 592         if (err)
 593                 return err;
 594
 595         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
 596         if (err)
 597                 return err;
 598
 599         if (line_ctl_test == 8) {
 600                 port_priv->has_swapped_line_ctl = true;
 601                 line_ctl_save = swab16(line_ctl_save);
 602         }
 603
 604         return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
 605 }
 606
 607 /*
 608  * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
 609  * to workaround cp2108 bug and get correct value.
 610  */
 611 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
 612 {
 613         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 614         int err;
 615
 616         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
 617         if (err)
 618                 return err;
 619
 620         /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
 621         if (port_priv->has_swapped_line_ctl)
 622                 *ctl = swab16(*ctl);
 623
 624         return 0;
 625 }
 626
 627 /*
 628  * cp210x_quantise_baudrate
 629  * Quantises the baud rate as per AN205 Table 1
 630  */
 631 static unsigned int cp210x_quantise_baudrate(unsigned int baud)
 632 {
 633         if (baud <= 300)
 634                 baud = 300;
 635         else if (baud <= 600)      baud = 600;
 636         else if (baud <= 1200)     baud = 1200;
 637         else if (baud <= 1800)     baud = 1800;
 638         else if (baud <= 2400)     baud = 2400;
 639         else if (baud <= 4000)     baud = 4000;
 640         else if (baud <= 4803)     baud = 4800;
 641         else if (baud <= 7207)     baud = 7200;
 642         else if (baud <= 9612)     baud = 9600;
 643         else if (baud <= 14428)    baud = 14400;
 644         else if (baud <= 16062)    baud = 16000;
 645         else if (baud <= 19250)    baud = 19200;
 646         else if (baud <= 28912)    baud = 28800;
 647         else if (baud <= 38601)    baud = 38400;
 648         else if (baud <= 51558)    baud = 51200;
 649         else if (baud <= 56280)    baud = 56000;
 650         else if (baud <= 58053)    baud = 57600;
 651         else if (baud <= 64111)    baud = 64000;
 652         else if (baud <= 77608)    baud = 76800;
 653         else if (baud <= 117028)   baud = 115200;
 654         else if (baud <= 129347)   baud = 128000;
 655         else if (baud <= 156868)   baud = 153600;
 656         else if (baud <= 237832)   baud = 230400;
 657         else if (baud <= 254234)   baud = 250000;
 658         else if (baud <= 273066)   baud = 256000;
 659         else if (baud <= 491520)   baud = 460800;
 660         else if (baud <= 567138)   baud = 500000;
 661         else if (baud <= 670254)   baud = 576000;
 662         else if (baud < 1000000)
 663                 baud = 921600;
 664         else if (baud > 2000000)
 665                 baud = 2000000;
 666         return baud;
 667 }
 668
 669 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 670 {
 671         int result;
 672
 673         result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
 674         if (result) {
 675                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
 676                 return result;
 677         }
 678
 679         /* Configure the termios structure */
 680         cp210x_get_termios(tty, port);
 681
 682         /* The baud rate must be initialised on cp2104 */
 683         if (tty)
 684                 cp210x_change_speed(tty, port, NULL);
 685
 686         return usb_serial_generic_open(tty, port);
 687 }
 688
 689 static void cp210x_close(struct usb_serial_port *port)
 690 {
 691         usb_serial_generic_close(port);
 692
 693         /* Clear both queues; cp2108 needs this to avoid an occasional hang */
 694         cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
 695
 696         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 697 }
 698
 699 /*
 700  * Read how many bytes are waiting in the TX queue.
 701  */
 702 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
 703                 u32 *count)
 704 {
 705         struct usb_serial *serial = port->serial;
 706         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 707         struct cp210x_comm_status *sts;
 708         int result;
 709
 710         sts = kmalloc(sizeof(*sts), GFP_KERNEL);
 711         if (!sts)
 712                 return -ENOMEM;
 713
 714         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 715                         CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
 716                         0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
 717                         USB_CTRL_GET_TIMEOUT);
 718         if (result == sizeof(*sts)) {
 719                 *count = le32_to_cpu(sts->ulAmountInOutQueue);
 720                 result = 0;
 721         } else {
 722                 dev_err(&port->dev, "failed to get comm status: %d\n", result);
 723                 if (result >= 0)
 724                         result = -EPROTO;
 725         }
 726
 727         kfree(sts);
 728
 729         return result;
 730 }
 731
 732 static bool cp210x_tx_empty(struct usb_serial_port *port)
 733 {
 734         int err;
 735         u32 count;
 736
 737         err = cp210x_get_tx_queue_byte_count(port, &count);
 738         if (err)
 739                 return true;
 740
 741         return !count;
 742 }
 743
 744 /*
 745  * cp210x_get_termios
 746  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 747  * from the device, corrects any unsupported values, and configures the
 748  * termios structure to reflect the state of the device
 749  */
 750 static void cp210x_get_termios(struct tty_struct *tty,
 751         struct usb_serial_port *port)
 752 {
 753         unsigned int baud;
 754
 755         if (tty) {
 756                 cp210x_get_termios_port(tty->driver_data,
 757                         &tty->termios.c_cflag, &baud);
 758                 tty_encode_baud_rate(tty, baud, baud);
 759         } else {
 760                 tcflag_t cflag;
 761                 cflag = 0;
 762                 cp210x_get_termios_port(port, &cflag, &baud);
 763         }
 764 }
 765
 766 /*
 767  * cp210x_get_termios_port
 768  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
 769  */
 770 static void cp210x_get_termios_port(struct usb_serial_port *port,
 771         tcflag_t *cflagp, unsigned int *baudp)
 772 {
 773         struct device *dev = &port->dev;
 774         tcflag_t cflag;
 775         struct cp210x_flow_ctl flow_ctl;
 776         u32 baud;
 777         u16 bits;
 778         u32 ctl_hs;
 779         u32 flow_repl;
 780
 781         cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
 782
 783         dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
 784         *baudp = baud;
 785
 786         cflag = *cflagp;
 787
 788         cp210x_get_line_ctl(port, &bits);
 789         cflag &= ~CSIZE;
 790         switch (bits & BITS_DATA_MASK) {
 791         case BITS_DATA_5:
 792                 dev_dbg(dev, "%s - data bits = 5\n", __func__);
 793                 cflag |= CS5;
 794                 break;
 795         case BITS_DATA_6:
 796                 dev_dbg(dev, "%s - data bits = 6\n", __func__);
 797                 cflag |= CS6;
 798                 break;
 799         case BITS_DATA_7:
 800                 dev_dbg(dev, "%s - data bits = 7\n", __func__);
 801                 cflag |= CS7;
 802                 break;
 803         case BITS_DATA_8:
 804                 dev_dbg(dev, "%s - data bits = 8\n", __func__);
 805                 cflag |= CS8;
 806                 break;
 807         case BITS_DATA_9:
 808                 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
 809                 cflag |= CS8;
 810                 bits &= ~BITS_DATA_MASK;
 811                 bits |= BITS_DATA_8;
 812                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 813                 break;
 814         default:
 815                 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
 816                 cflag |= CS8;
 817                 bits &= ~BITS_DATA_MASK;
 818                 bits |= BITS_DATA_8;
 819                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 820                 break;
 821         }
 822
 823         switch (bits & BITS_PARITY_MASK) {
 824         case BITS_PARITY_NONE:
 825                 dev_dbg(dev, "%s - parity = NONE\n", __func__);
 826                 cflag &= ~PARENB;
 827                 break;
 828         case BITS_PARITY_ODD:
 829                 dev_dbg(dev, "%s - parity = ODD\n", __func__);
 830                 cflag |= (PARENB|PARODD);
 831                 break;
 832         case BITS_PARITY_EVEN:
 833                 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
 834                 cflag &= ~PARODD;
 835                 cflag |= PARENB;
 836                 break;
 837         case BITS_PARITY_MARK:
 838                 dev_dbg(dev, "%s - parity = MARK\n", __func__);
 839                 cflag |= (PARENB|PARODD|CMSPAR);
 840                 break;
 841         case BITS_PARITY_SPACE:
 842                 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
 843                 cflag &= ~PARODD;
 844                 cflag |= (PARENB|CMSPAR);
 845                 break;
 846         default:
 847                 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
 848                 cflag &= ~PARENB;
 849                 bits &= ~BITS_PARITY_MASK;
 850                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 851                 break;
 852         }
 853
 854         cflag &= ~CSTOPB;
 855         switch (bits & BITS_STOP_MASK) {
 856         case BITS_STOP_1:
 857                 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
 858                 break;
 859         case BITS_STOP_1_5:
 860                 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
 861                 bits &= ~BITS_STOP_MASK;
 862                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 863                 break;
 864         case BITS_STOP_2:
 865                 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
 866                 cflag |= CSTOPB;
 867                 break;
 868         default:
 869                 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
 870                 bits &= ~BITS_STOP_MASK;
 871                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 872                 break;
 873         }
 874
 875         cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
 876                         sizeof(flow_ctl));
 877         ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
 878         if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
 879                 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
 880                 /*
 881                  * When the port is closed, the CP210x hardware disables
 882                  * auto-RTS and RTS is deasserted but it leaves auto-CTS when
 883                  * in hardware flow control mode. When re-opening the port, if
 884                  * auto-CTS is enabled on the cp210x, then auto-RTS must be
 885                  * re-enabled in the driver.
 886                  */
 887                 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
 888                 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
 889                 flow_repl |= CP210X_SERIAL_RTS_SHIFT(CP210X_SERIAL_RTS_FLOW_CTL);
 890                 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
 891                 cp210x_write_reg_block(port,
 892                                 CP210X_SET_FLOW,
 893                                 &flow_ctl,
 894                                 sizeof(flow_ctl));
 895
 896                 cflag |= CRTSCTS;
 897         } else {
 898                 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
 899                 cflag &= ~CRTSCTS;
 900         }
 901
 902         *cflagp = cflag;
 903 }
 904
 905 /*
 906  * CP2101 supports the following baud rates:
 907  *
 908  *      300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
 909  *      38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
 910  *
 911  * CP2102 and CP2103 support the following additional rates:
 912  *
 913  *      4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
 914  *      576000
 915  *
 916  * The device will map a requested rate to a supported one, but the result
 917  * of requests for rates greater than 1053257 is undefined (see AN205).
 918  *
 919  * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
 920  * respectively, with an error less than 1%. The actual rates are determined
 921  * by
 922  *
 923  *      div = round(freq / (2 x prescale x request))
 924  *      actual = freq / (2 x prescale x div)
 925  *
 926  * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
 927  * or 1 otherwise.
 928  * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
 929  * otherwise.
 930  */
 931 static void cp210x_change_speed(struct tty_struct *tty,
 932                 struct usb_serial_port *port, struct ktermios *old_termios)
 933 {
 934         u32 baud;
 935
 936         baud = tty->termios.c_ospeed;
 937
 938         /* This maps the requested rate to a rate valid on cp2102 or cp2103,
 939          * or to an arbitrary rate in [1M,2M].
 940          *
 941          * NOTE: B0 is not implemented.
 942          */
 943         baud = cp210x_quantise_baudrate(baud);
 944
 945         dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
 946         if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
 947                 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
 948                 if (old_termios)
 949                         baud = old_termios->c_ospeed;
 950                 else
 951                         baud = 9600;
 952         }
 953
 954         tty_encode_baud_rate(tty, baud, baud);
 955 }
 956
 957 static void cp210x_set_termios(struct tty_struct *tty,
 958                 struct usb_serial_port *port, struct ktermios *old_termios)
 959 {
 960         struct device *dev = &port->dev;
 961         unsigned int cflag, old_cflag;
 962         u16 bits;
 963
 964         cflag = tty->termios.c_cflag;
 965         old_cflag = old_termios->c_cflag;
 966
 967         if (tty->termios.c_ospeed != old_termios->c_ospeed)
 968                 cp210x_change_speed(tty, port, old_termios);
 969
 970         /* If the number of data bits is to be updated */
 971         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 972                 cp210x_get_line_ctl(port, &bits);
 973                 bits &= ~BITS_DATA_MASK;
 974                 switch (cflag & CSIZE) {
 975                 case CS5:
 976                         bits |= BITS_DATA_5;
 977                         dev_dbg(dev, "%s - data bits = 5\n", __func__);
 978                         break;
 979                 case CS6:
 980                         bits |= BITS_DATA_6;
 981                         dev_dbg(dev, "%s - data bits = 6\n", __func__);
 982                         break;
 983                 case CS7:
 984                         bits |= BITS_DATA_7;
 985                         dev_dbg(dev, "%s - data bits = 7\n", __func__);
 986                         break;
 987                 case CS8:
 988                         bits |= BITS_DATA_8;
 989                         dev_dbg(dev, "%s - data bits = 8\n", __func__);
 990                         break;
 991                 /*case CS9:
 992                         bits |= BITS_DATA_9;
 993                         dev_dbg(dev, "%s - data bits = 9\n", __func__);
 994                         break;*/
 995                 default:
 996                         dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n");
 997                         bits |= BITS_DATA_8;
 998                         break;
 999                 }
1000                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1001                         dev_dbg(dev, "Number of data bits requested not supported by device\n");
1002         }
1003
1004         if ((cflag     & (PARENB|PARODD|CMSPAR)) !=
1005             (old_cflag & (PARENB|PARODD|CMSPAR))) {
1006                 cp210x_get_line_ctl(port, &bits);
1007                 bits &= ~BITS_PARITY_MASK;
1008                 if (cflag & PARENB) {
1009                         if (cflag & CMSPAR) {
1010                                 if (cflag & PARODD) {
1011                                         bits |= BITS_PARITY_MARK;
1012                                         dev_dbg(dev, "%s - parity = MARK\n", __func__);
1013                                 } else {
1014                                         bits |= BITS_PARITY_SPACE;
1015                                         dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1016                                 }
1017                         } else {
1018                                 if (cflag & PARODD) {
1019                                         bits |= BITS_PARITY_ODD;
1020                                         dev_dbg(dev, "%s - parity = ODD\n", __func__);
1021                                 } else {
1022                                         bits |= BITS_PARITY_EVEN;
1023                                         dev_dbg(dev, "%s - parity = EVEN\n", __func__);
1024                                 }
1025                         }
1026                 }
1027                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1028                         dev_dbg(dev, "Parity mode not supported by device\n");
1029         }
1030
1031         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
1032                 cp210x_get_line_ctl(port, &bits);
1033                 bits &= ~BITS_STOP_MASK;
1034                 if (cflag & CSTOPB) {
1035                         bits |= BITS_STOP_2;
1036                         dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1037                 } else {
1038                         bits |= BITS_STOP_1;
1039                         dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1040                 }
1041                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1042                         dev_dbg(dev, "Number of stop bits requested not supported by device\n");
1043         }
1044
1045         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
1046                 struct cp210x_flow_ctl flow_ctl;
1047                 u32 ctl_hs;
1048                 u32 flow_repl;
1049
1050                 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1051                                 sizeof(flow_ctl));
1052                 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1053                 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1054                 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1055                                 __func__, ctl_hs, flow_repl);
1056
1057                 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1058                 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1059                 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1060                 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1061                 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1062                 if (cflag & CRTSCTS) {
1063                         ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1064
1065                         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1066                         flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1067                                         CP210X_SERIAL_RTS_FLOW_CTL);
1068                         dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1069                 } else {
1070                         ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1071
1072                         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1073                         flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1074                                         CP210X_SERIAL_RTS_ACTIVE);
1075                         dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1076                 }
1077
1078                 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1079                                 __func__, ctl_hs, flow_repl);
1080                 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1081                 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1082                 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1083                                 sizeof(flow_ctl));
1084         }
1085
1086 }
1087
1088 static int cp210x_tiocmset(struct tty_struct *tty,
1089                 unsigned int set, unsigned int clear)
1090 {
1091         struct usb_serial_port *port = tty->driver_data;
1092         return cp210x_tiocmset_port(port, set, clear);
1093 }
1094
1095 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1096                 unsigned int set, unsigned int clear)
1097 {
1098         u16 control = 0;
1099
1100         if (set & TIOCM_RTS) {
1101                 control |= CONTROL_RTS;
1102                 control |= CONTROL_WRITE_RTS;
1103         }
1104         if (set & TIOCM_DTR) {
1105                 control |= CONTROL_DTR;
1106                 control |= CONTROL_WRITE_DTR;
1107         }
1108         if (clear & TIOCM_RTS) {
1109                 control &= ~CONTROL_RTS;
1110                 control |= CONTROL_WRITE_RTS;
1111         }
1112         if (clear & TIOCM_DTR) {
1113                 control &= ~CONTROL_DTR;
1114                 control |= CONTROL_WRITE_DTR;
1115         }
1116
1117         dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1118
1119         return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1120 }
1121
1122 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1123 {
1124         if (on)
1125                 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1126         else
1127                 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1128 }
1129
1130 static int cp210x_tiocmget(struct tty_struct *tty)
1131 {
1132         struct usb_serial_port *port = tty->driver_data;
1133         u8 control;
1134         int result;
1135
1136         result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1137         if (result)
1138                 return result;
1139
1140         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1141                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1142                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1143                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1144                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
1145                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
1146
1147         dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1148
1149         return result;
1150 }
1151
1152 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1153 {
1154         struct usb_serial_port *port = tty->driver_data;
1155         u16 state;
1156
1157         if (break_state == 0)
1158                 state = BREAK_OFF;
1159         else
1160                 state = BREAK_ON;
1161         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1162                 state == BREAK_OFF ? "off" : "on");
1163         cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1164 }
1165
1166 static int cp210x_port_probe(struct usb_serial_port *port)
1167 {
1168         struct usb_serial *serial = port->serial;
1169         struct usb_host_interface *cur_altsetting;
1170         struct cp210x_port_private *port_priv;
1171         int ret;
1172
1173         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1174         if (!port_priv)
1175                 return -ENOMEM;
1176
1177         cur_altsetting = serial->interface->cur_altsetting;
1178         port_priv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber;
1179
1180         usb_set_serial_port_data(port, port_priv);
1181
1182         ret = cp210x_detect_swapped_line_ctl(port);
1183         if (ret) {
1184                 kfree(port_priv);
1185                 return ret;
1186         }
1187
1188         return 0;
1189 }
1190
1191 static int cp210x_port_remove(struct usb_serial_port *port)
1192 {
1193         struct cp210x_port_private *port_priv;
1194
1195         port_priv = usb_get_serial_port_data(port);
1196         kfree(port_priv);
1197
1198         return 0;
1199 }
1200
1201 module_usb_serial_driver(serial_drivers, id_table);
1202
1203 MODULE_DESCRIPTION(DRIVER_DESC);
1204 MODULE_LICENSE("GPL");