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