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         unsigned int *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(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
  62         { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
  63         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  64         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
  65         { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
  66         { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
  67         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  68         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  69         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  70         { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
  71         { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
  72         { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
  73         { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
  74         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  75         { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
  76         { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
  77         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
  78         { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
  79         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  80         { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
  81         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  82         { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
  83         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  84         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
  85         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  86         { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
  87         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  88         { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
  89         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
  90         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
  91         { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
  92         { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
  93         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
  94         { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
  95         { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
  96         { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
  97         { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
  98         { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
  99         { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
 100         { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
 101         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
 102         { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
 103         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
 104         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
 105         { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
 106         { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
 107         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
 108         { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
 109         { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
 110         { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
 111         { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
 112         { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
 113         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
 114         { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
 115         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
 116         { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
 117         { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
 118         { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
 119         { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
 120         { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
 121         { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
 122         { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
 123         { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
 124         { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
 125         { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
 126         { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
 127         { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
 128         { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
 129         { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
 130         { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
 131         { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
 132         { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
 133         { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
 134         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 135         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 136         { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
 137         { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
 138         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 139         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 140         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 141         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 142         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 143         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 144         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 145         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 146         { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
 147         { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
 148         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 149         { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
 150         { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
 151         { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
 152         { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
 153         { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
 154         { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
 155         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 156         { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
 157         { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
 158         { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
 159         { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
 160         { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
 161         { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
 162         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
 163         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
 164         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 165         { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
 166         { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
 167         { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
 168         { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
 169         { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
 170         { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
 171         { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
 172         { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
 173         { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
 174         { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
 175         { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
 176         { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
 177         { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
 178         { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
 179         { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
 180         { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
 181         { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
 182         { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
 183         { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
 184         { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
 185         { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
 186         { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
 187         { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
 188         { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
 189         { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
 190         { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
 191         { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
 192         { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
 193         { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
 194         { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
 195         { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
 196         { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
 197         { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
 198         { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
 199         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 200         { } /* Terminating Entry */
 201 };
 202
 203 MODULE_DEVICE_TABLE(usb, id_table);
 204
 205 struct cp210x_port_private {
 206         __u8                    bInterfaceNumber;
 207         bool                    has_swapped_line_ctl;
 208 };
 209
 210 static struct usb_serial_driver cp210x_device = {
 211         .driver = {
 212                 .owner =        THIS_MODULE,
 213                 .name =         "cp210x",
 214         },
 215         .id_table               = id_table,
 216         .num_ports              = 1,
 217         .bulk_in_size           = 256,
 218         .bulk_out_size          = 256,
 219         .open                   = cp210x_open,
 220         .close                  = cp210x_close,
 221         .break_ctl              = cp210x_break_ctl,
 222         .set_termios            = cp210x_set_termios,
 223         .tx_empty               = cp210x_tx_empty,
 224         .tiocmget               = cp210x_tiocmget,
 225         .tiocmset               = cp210x_tiocmset,
 226         .port_probe             = cp210x_port_probe,
 227         .port_remove            = cp210x_port_remove,
 228         .dtr_rts                = cp210x_dtr_rts
 229 };
 230
 231 static struct usb_serial_driver * const serial_drivers[] = {
 232         &cp210x_device, NULL
 233 };
 234
 235 /* Config request types */
 236 #define REQTYPE_HOST_TO_INTERFACE       0x41
 237 #define REQTYPE_INTERFACE_TO_HOST       0xc1
 238 #define REQTYPE_HOST_TO_DEVICE  0x40
 239 #define REQTYPE_DEVICE_TO_HOST  0xc0
 240
 241 /* Config request codes */
 242 #define CP210X_IFC_ENABLE       0x00
 243 #define CP210X_SET_BAUDDIV      0x01
 244 #define CP210X_GET_BAUDDIV      0x02
 245 #define CP210X_SET_LINE_CTL     0x03
 246 #define CP210X_GET_LINE_CTL     0x04
 247 #define CP210X_SET_BREAK        0x05
 248 #define CP210X_IMM_CHAR         0x06
 249 #define CP210X_SET_MHS          0x07
 250 #define CP210X_GET_MDMSTS       0x08
 251 #define CP210X_SET_XON          0x09
 252 #define CP210X_SET_XOFF         0x0A
 253 #define CP210X_SET_EVENTMASK    0x0B
 254 #define CP210X_GET_EVENTMASK    0x0C
 255 #define CP210X_SET_CHAR         0x0D
 256 #define CP210X_GET_CHARS        0x0E
 257 #define CP210X_GET_PROPS        0x0F
 258 #define CP210X_GET_COMM_STATUS  0x10
 259 #define CP210X_RESET            0x11
 260 #define CP210X_PURGE            0x12
 261 #define CP210X_SET_FLOW         0x13
 262 #define CP210X_GET_FLOW         0x14
 263 #define CP210X_EMBED_EVENTS     0x15
 264 #define CP210X_GET_EVENTSTATE   0x16
 265 #define CP210X_SET_CHARS        0x19
 266 #define CP210X_GET_BAUDRATE     0x1D
 267 #define CP210X_SET_BAUDRATE     0x1E
 268
 269 /* CP210X_IFC_ENABLE */
 270 #define UART_ENABLE             0x0001
 271 #define UART_DISABLE            0x0000
 272
 273 /* CP210X_(SET|GET)_BAUDDIV */
 274 #define BAUD_RATE_GEN_FREQ      0x384000
 275
 276 /* CP210X_(SET|GET)_LINE_CTL */
 277 #define BITS_DATA_MASK          0X0f00
 278 #define BITS_DATA_5             0X0500
 279 #define BITS_DATA_6             0X0600
 280 #define BITS_DATA_7             0X0700
 281 #define BITS_DATA_8             0X0800
 282 #define BITS_DATA_9             0X0900
 283
 284 #define BITS_PARITY_MASK        0x00f0
 285 #define BITS_PARITY_NONE        0x0000
 286 #define BITS_PARITY_ODD         0x0010
 287 #define BITS_PARITY_EVEN        0x0020
 288 #define BITS_PARITY_MARK        0x0030
 289 #define BITS_PARITY_SPACE       0x0040
 290
 291 #define BITS_STOP_MASK          0x000f
 292 #define BITS_STOP_1             0x0000
 293 #define BITS_STOP_1_5           0x0001
 294 #define BITS_STOP_2             0x0002
 295
 296 /* CP210X_SET_BREAK */
 297 #define BREAK_ON                0x0001
 298 #define BREAK_OFF               0x0000
 299
 300 /* CP210X_(SET_MHS|GET_MDMSTS) */
 301 #define CONTROL_DTR             0x0001
 302 #define CONTROL_RTS             0x0002
 303 #define CONTROL_CTS             0x0010
 304 #define CONTROL_DSR             0x0020
 305 #define CONTROL_RING            0x0040
 306 #define CONTROL_DCD             0x0080
 307 #define CONTROL_WRITE_DTR       0x0100
 308 #define CONTROL_WRITE_RTS       0x0200
 309
 310 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
 311 struct cp210x_comm_status {
 312         __le32   ulErrors;
 313         __le32   ulHoldReasons;
 314         __le32   ulAmountInInQueue;
 315         __le32   ulAmountInOutQueue;
 316         u8       bEofReceived;
 317         u8       bWaitForImmediate;
 318         u8       bReserved;
 319 } __packed;
 320
 321 /*
 322  * CP210X_PURGE - 16 bits passed in wValue of USB request.
 323  * SiLabs app note AN571 gives a strange description of the 4 bits:
 324  * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
 325  * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
 326  */
 327 #define PURGE_ALL               0x000f
 328
 329 /*
 330  * cp210x_get_config
 331  * Reads from the CP210x configuration registers
 332  * 'size' is specified in bytes.
 333  * 'data' is a pointer to a pre-allocated array of integers large
 334  * enough to hold 'size' bytes (with 4 bytes to each integer)
 335  */
 336 static int cp210x_get_config(struct usb_serial_port *port, u8 request,
 337                 unsigned int *data, int size)
 338 {
 339         struct usb_serial *serial = port->serial;
 340         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 341         __le32 *buf;
 342         int result, i, length;
 343
 344         /* Number of integers required to contain the array */
 345         length = (((size - 1) | 3) + 1) / 4;
 346
 347         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
 348         if (!buf)
 349                 return -ENOMEM;
 350
 351         /* Issue the request, attempting to read 'size' bytes */
 352         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 353                                 request, REQTYPE_INTERFACE_TO_HOST, 0x0000,
 354                                 port_priv->bInterfaceNumber, buf, size,
 355                                 USB_CTRL_GET_TIMEOUT);
 356
 357         /* Convert data into an array of integers */
 358         for (i = 0; i < length; i++)
 359                 data[i] = le32_to_cpu(buf[i]);
 360
 361         kfree(buf);
 362
 363         if (result != size) {
 364                 dev_dbg(&port->dev, "%s - Unable to send config request, request=0x%x size=%d result=%d\n",
 365                         __func__, request, size, result);
 366                 if (result > 0)
 367                         result = -EPROTO;
 368
 369                 return result;
 370         }
 371
 372         return 0;
 373 }
 374
 375 /*
 376  * cp210x_set_config
 377  * Writes to the CP210x configuration registers
 378  * Values less than 16 bits wide are sent directly
 379  * 'size' is specified in bytes.
 380  */
 381 static int cp210x_set_config(struct usb_serial_port *port, u8 request,
 382                 unsigned int *data, int size)
 383 {
 384         struct usb_serial *serial = port->serial;
 385         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 386         __le32 *buf;
 387         int result, i, length;
 388
 389         /* Number of integers required to contain the array */
 390         length = (((size - 1) | 3) + 1) / 4;
 391
 392         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
 393         if (!buf)
 394                 return -ENOMEM;
 395
 396         /* Array of integers into bytes */
 397         for (i = 0; i < length; i++)
 398                 buf[i] = cpu_to_le32(data[i]);
 399
 400         if (size > 2) {
 401                 result = usb_control_msg(serial->dev,
 402                                 usb_sndctrlpipe(serial->dev, 0),
 403                                 request, REQTYPE_HOST_TO_INTERFACE, 0x0000,
 404                                 port_priv->bInterfaceNumber, buf, size,
 405                                 USB_CTRL_SET_TIMEOUT);
 406         } else {
 407                 result = usb_control_msg(serial->dev,
 408                                 usb_sndctrlpipe(serial->dev, 0),
 409                                 request, REQTYPE_HOST_TO_INTERFACE, data[0],
 410                                 port_priv->bInterfaceNumber, NULL, 0,
 411                                 USB_CTRL_SET_TIMEOUT);
 412         }
 413
 414         kfree(buf);
 415
 416         if ((size > 2 && result != size) || result < 0) {
 417                 dev_dbg(&port->dev, "%s - Unable to send request, request=0x%x size=%d result=%d\n",
 418                         __func__, request, size, result);
 419                 if (result > 0)
 420                         result = -EPROTO;
 421
 422                 return result;
 423         }
 424
 425         return 0;
 426 }
 427
 428 /*
 429  * cp210x_set_config_single
 430  * Convenience function for calling cp210x_set_config on single data values
 431  * without requiring an integer pointer
 432  */
 433 static inline int cp210x_set_config_single(struct usb_serial_port *port,
 434                 u8 request, unsigned int data)
 435 {
 436         return cp210x_set_config(port, request, &data, 2);
 437 }
 438
 439 /*
 440  * Detect CP2108 GET_LINE_CTL bug and activate workaround.
 441  * Write a known good value 0x800, read it back.
 442  * If it comes back swapped the bug is detected.
 443  * Preserve the original register value.
 444  */
 445 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
 446 {
 447         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 448         unsigned int line_ctl_save;
 449         unsigned int line_ctl_test;
 450         int err;
 451
 452         err = cp210x_get_config(port, CP210X_GET_LINE_CTL, &line_ctl_save, 2);
 453         if (err)
 454                 return err;
 455
 456         line_ctl_test = 0x800;
 457         err = cp210x_set_config(port, CP210X_SET_LINE_CTL, &line_ctl_test, 2);
 458         if (err)
 459                 return err;
 460
 461         err = cp210x_get_config(port, CP210X_GET_LINE_CTL, &line_ctl_test, 2);
 462         if (err)
 463                 return err;
 464
 465         if (line_ctl_test == 8) {
 466                 port_priv->has_swapped_line_ctl = true;
 467                 line_ctl_save = swab16((u16)line_ctl_save);
 468         }
 469
 470         return cp210x_set_config(port, CP210X_SET_LINE_CTL, &line_ctl_save, 2);
 471 }
 472
 473 /*
 474  * Must always be called instead of cp210x_get_config(CP210X_GET_LINE_CTL)
 475  * to workaround cp2108 bug and get correct value.
 476  */
 477 static int cp210x_get_line_ctl(struct usb_serial_port *port, unsigned int *ctl)
 478 {
 479         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 480         int err;
 481
 482         err = cp210x_get_config(port, CP210X_GET_LINE_CTL, ctl, 2);
 483         if (err)
 484                 return err;
 485
 486         /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
 487         if (port_priv->has_swapped_line_ctl)
 488                 *ctl = swab16((u16)(*ctl));
 489
 490         return 0;
 491 }
 492
 493 /*
 494  * cp210x_quantise_baudrate
 495  * Quantises the baud rate as per AN205 Table 1
 496  */
 497 static unsigned int cp210x_quantise_baudrate(unsigned int baud)
 498 {
 499         if (baud <= 300)
 500                 baud = 300;
 501         else if (baud <= 600)      baud = 600;
 502         else if (baud <= 1200)     baud = 1200;
 503         else if (baud <= 1800)     baud = 1800;
 504         else if (baud <= 2400)     baud = 2400;
 505         else if (baud <= 4000)     baud = 4000;
 506         else if (baud <= 4803)     baud = 4800;
 507         else if (baud <= 7207)     baud = 7200;
 508         else if (baud <= 9612)     baud = 9600;
 509         else if (baud <= 14428)    baud = 14400;
 510         else if (baud <= 16062)    baud = 16000;
 511         else if (baud <= 19250)    baud = 19200;
 512         else if (baud <= 28912)    baud = 28800;
 513         else if (baud <= 38601)    baud = 38400;
 514         else if (baud <= 51558)    baud = 51200;
 515         else if (baud <= 56280)    baud = 56000;
 516         else if (baud <= 58053)    baud = 57600;
 517         else if (baud <= 64111)    baud = 64000;
 518         else if (baud <= 77608)    baud = 76800;
 519         else if (baud <= 117028)   baud = 115200;
 520         else if (baud <= 129347)   baud = 128000;
 521         else if (baud <= 156868)   baud = 153600;
 522         else if (baud <= 237832)   baud = 230400;
 523         else if (baud <= 254234)   baud = 250000;
 524         else if (baud <= 273066)   baud = 256000;
 525         else if (baud <= 491520)   baud = 460800;
 526         else if (baud <= 567138)   baud = 500000;
 527         else if (baud <= 670254)   baud = 576000;
 528         else if (baud < 1000000)
 529                 baud = 921600;
 530         else if (baud > 2000000)
 531                 baud = 2000000;
 532         return baud;
 533 }
 534
 535 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 536 {
 537         int result;
 538
 539         result = cp210x_set_config_single(port, CP210X_IFC_ENABLE,
 540                                                                 UART_ENABLE);
 541         if (result) {
 542                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
 543                 return result;
 544         }
 545
 546         /* Configure the termios structure */
 547         cp210x_get_termios(tty, port);
 548
 549         /* The baud rate must be initialised on cp2104 */
 550         if (tty)
 551                 cp210x_change_speed(tty, port, NULL);
 552
 553         return usb_serial_generic_open(tty, port);
 554 }
 555
 556 static void cp210x_close(struct usb_serial_port *port)
 557 {
 558         unsigned int purge_ctl;
 559
 560         usb_serial_generic_close(port);
 561
 562         /* Clear both queues; cp2108 needs this to avoid an occasional hang */
 563         purge_ctl = PURGE_ALL;
 564         cp210x_set_config(port, CP210X_PURGE, &purge_ctl, 2);
 565
 566         cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE);
 567 }
 568
 569 /*
 570  * Read how many bytes are waiting in the TX queue.
 571  */
 572 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
 573                 u32 *count)
 574 {
 575         struct usb_serial *serial = port->serial;
 576         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 577         struct cp210x_comm_status *sts;
 578         int result;
 579
 580         sts = kmalloc(sizeof(*sts), GFP_KERNEL);
 581         if (!sts)
 582                 return -ENOMEM;
 583
 584         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 585                         CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
 586                         0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
 587                         USB_CTRL_GET_TIMEOUT);
 588         if (result == sizeof(*sts)) {
 589                 *count = le32_to_cpu(sts->ulAmountInOutQueue);
 590                 result = 0;
 591         } else {
 592                 dev_err(&port->dev, "failed to get comm status: %d\n", result);
 593                 if (result >= 0)
 594                         result = -EPROTO;
 595         }
 596
 597         kfree(sts);
 598
 599         return result;
 600 }
 601
 602 static bool cp210x_tx_empty(struct usb_serial_port *port)
 603 {
 604         int err;
 605         u32 count;
 606
 607         err = cp210x_get_tx_queue_byte_count(port, &count);
 608         if (err)
 609                 return true;
 610
 611         return !count;
 612 }
 613
 614 /*
 615  * cp210x_get_termios
 616  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 617  * from the device, corrects any unsupported values, and configures the
 618  * termios structure to reflect the state of the device
 619  */
 620 static void cp210x_get_termios(struct tty_struct *tty,
 621         struct usb_serial_port *port)
 622 {
 623         unsigned int baud;
 624
 625         if (tty) {
 626                 cp210x_get_termios_port(tty->driver_data,
 627                         &tty->termios.c_cflag, &baud);
 628                 tty_encode_baud_rate(tty, baud, baud);
 629         } else {
 630                 unsigned int cflag;
 631                 cflag = 0;
 632                 cp210x_get_termios_port(port, &cflag, &baud);
 633         }
 634 }
 635
 636 /*
 637  * cp210x_get_termios_port
 638  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
 639  */
 640 static void cp210x_get_termios_port(struct usb_serial_port *port,
 641         unsigned int *cflagp, unsigned int *baudp)
 642 {
 643         struct device *dev = &port->dev;
 644         unsigned int cflag, modem_ctl[4];
 645         unsigned int baud;
 646         unsigned int bits;
 647
 648         cp210x_get_config(port, CP210X_GET_BAUDRATE, &baud, 4);
 649
 650         dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
 651         *baudp = baud;
 652
 653         cflag = *cflagp;
 654
 655         cp210x_get_line_ctl(port, &bits);
 656         cflag &= ~CSIZE;
 657         switch (bits & BITS_DATA_MASK) {
 658         case BITS_DATA_5:
 659                 dev_dbg(dev, "%s - data bits = 5\n", __func__);
 660                 cflag |= CS5;
 661                 break;
 662         case BITS_DATA_6:
 663                 dev_dbg(dev, "%s - data bits = 6\n", __func__);
 664                 cflag |= CS6;
 665                 break;
 666         case BITS_DATA_7:
 667                 dev_dbg(dev, "%s - data bits = 7\n", __func__);
 668                 cflag |= CS7;
 669                 break;
 670         case BITS_DATA_8:
 671                 dev_dbg(dev, "%s - data bits = 8\n", __func__);
 672                 cflag |= CS8;
 673                 break;
 674         case BITS_DATA_9:
 675                 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
 676                 cflag |= CS8;
 677                 bits &= ~BITS_DATA_MASK;
 678                 bits |= BITS_DATA_8;
 679                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 680                 break;
 681         default:
 682                 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
 683                 cflag |= CS8;
 684                 bits &= ~BITS_DATA_MASK;
 685                 bits |= BITS_DATA_8;
 686                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 687                 break;
 688         }
 689
 690         switch (bits & BITS_PARITY_MASK) {
 691         case BITS_PARITY_NONE:
 692                 dev_dbg(dev, "%s - parity = NONE\n", __func__);
 693                 cflag &= ~PARENB;
 694                 break;
 695         case BITS_PARITY_ODD:
 696                 dev_dbg(dev, "%s - parity = ODD\n", __func__);
 697                 cflag |= (PARENB|PARODD);
 698                 break;
 699         case BITS_PARITY_EVEN:
 700                 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
 701                 cflag &= ~PARODD;
 702                 cflag |= PARENB;
 703                 break;
 704         case BITS_PARITY_MARK:
 705                 dev_dbg(dev, "%s - parity = MARK\n", __func__);
 706                 cflag |= (PARENB|PARODD|CMSPAR);
 707                 break;
 708         case BITS_PARITY_SPACE:
 709                 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
 710                 cflag &= ~PARODD;
 711                 cflag |= (PARENB|CMSPAR);
 712                 break;
 713         default:
 714                 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
 715                 cflag &= ~PARENB;
 716                 bits &= ~BITS_PARITY_MASK;
 717                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 718                 break;
 719         }
 720
 721         cflag &= ~CSTOPB;
 722         switch (bits & BITS_STOP_MASK) {
 723         case BITS_STOP_1:
 724                 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
 725                 break;
 726         case BITS_STOP_1_5:
 727                 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
 728                 bits &= ~BITS_STOP_MASK;
 729                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 730                 break;
 731         case BITS_STOP_2:
 732                 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
 733                 cflag |= CSTOPB;
 734                 break;
 735         default:
 736                 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
 737                 bits &= ~BITS_STOP_MASK;
 738                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 739                 break;
 740         }
 741
 742         cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
 743         if (modem_ctl[0] & 0x0008) {
 744                 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
 745                 cflag |= CRTSCTS;
 746         } else {
 747                 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
 748                 cflag &= ~CRTSCTS;
 749         }
 750
 751         *cflagp = cflag;
 752 }
 753
 754 /*
 755  * CP2101 supports the following baud rates:
 756  *
 757  *      300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
 758  *      38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
 759  *
 760  * CP2102 and CP2103 support the following additional rates:
 761  *
 762  *      4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
 763  *      576000
 764  *
 765  * The device will map a requested rate to a supported one, but the result
 766  * of requests for rates greater than 1053257 is undefined (see AN205).
 767  *
 768  * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
 769  * respectively, with an error less than 1%. The actual rates are determined
 770  * by
 771  *
 772  *      div = round(freq / (2 x prescale x request))
 773  *      actual = freq / (2 x prescale x div)
 774  *
 775  * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
 776  * or 1 otherwise.
 777  * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
 778  * otherwise.
 779  */
 780 static void cp210x_change_speed(struct tty_struct *tty,
 781                 struct usb_serial_port *port, struct ktermios *old_termios)
 782 {
 783         u32 baud;
 784
 785         baud = tty->termios.c_ospeed;
 786
 787         /* This maps the requested rate to a rate valid on cp2102 or cp2103,
 788          * or to an arbitrary rate in [1M,2M].
 789          *
 790          * NOTE: B0 is not implemented.
 791          */
 792         baud = cp210x_quantise_baudrate(baud);
 793
 794         dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
 795         if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud,
 796                                                         sizeof(baud))) {
 797                 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
 798                 if (old_termios)
 799                         baud = old_termios->c_ospeed;
 800                 else
 801                         baud = 9600;
 802         }
 803
 804         tty_encode_baud_rate(tty, baud, baud);
 805 }
 806
 807 static void cp210x_set_termios(struct tty_struct *tty,
 808                 struct usb_serial_port *port, struct ktermios *old_termios)
 809 {
 810         struct device *dev = &port->dev;
 811         unsigned int cflag, old_cflag;
 812         unsigned int bits;
 813         unsigned int modem_ctl[4];
 814
 815         cflag = tty->termios.c_cflag;
 816         old_cflag = old_termios->c_cflag;
 817
 818         if (tty->termios.c_ospeed != old_termios->c_ospeed)
 819                 cp210x_change_speed(tty, port, old_termios);
 820
 821         /* If the number of data bits is to be updated */
 822         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 823                 cp210x_get_line_ctl(port, &bits);
 824                 bits &= ~BITS_DATA_MASK;
 825                 switch (cflag & CSIZE) {
 826                 case CS5:
 827                         bits |= BITS_DATA_5;
 828                         dev_dbg(dev, "%s - data bits = 5\n", __func__);
 829                         break;
 830                 case CS6:
 831                         bits |= BITS_DATA_6;
 832                         dev_dbg(dev, "%s - data bits = 6\n", __func__);
 833                         break;
 834                 case CS7:
 835                         bits |= BITS_DATA_7;
 836                         dev_dbg(dev, "%s - data bits = 7\n", __func__);
 837                         break;
 838                 case CS8:
 839                         bits |= BITS_DATA_8;
 840                         dev_dbg(dev, "%s - data bits = 8\n", __func__);
 841                         break;
 842                 /*case CS9:
 843                         bits |= BITS_DATA_9;
 844                         dev_dbg(dev, "%s - data bits = 9\n", __func__);
 845                         break;*/
 846                 default:
 847                         dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n");
 848                         bits |= BITS_DATA_8;
 849                         break;
 850                 }
 851                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 852                         dev_dbg(dev, "Number of data bits requested not supported by device\n");
 853         }
 854
 855         if ((cflag     & (PARENB|PARODD|CMSPAR)) !=
 856             (old_cflag & (PARENB|PARODD|CMSPAR))) {
 857                 cp210x_get_line_ctl(port, &bits);
 858                 bits &= ~BITS_PARITY_MASK;
 859                 if (cflag & PARENB) {
 860                         if (cflag & CMSPAR) {
 861                                 if (cflag & PARODD) {
 862                                         bits |= BITS_PARITY_MARK;
 863                                         dev_dbg(dev, "%s - parity = MARK\n", __func__);
 864                                 } else {
 865                                         bits |= BITS_PARITY_SPACE;
 866                                         dev_dbg(dev, "%s - parity = SPACE\n", __func__);
 867                                 }
 868                         } else {
 869                                 if (cflag & PARODD) {
 870                                         bits |= BITS_PARITY_ODD;
 871                                         dev_dbg(dev, "%s - parity = ODD\n", __func__);
 872                                 } else {
 873                                         bits |= BITS_PARITY_EVEN;
 874                                         dev_dbg(dev, "%s - parity = EVEN\n", __func__);
 875                                 }
 876                         }
 877                 }
 878                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 879                         dev_dbg(dev, "Parity mode not supported by device\n");
 880         }
 881
 882         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 883                 cp210x_get_line_ctl(port, &bits);
 884                 bits &= ~BITS_STOP_MASK;
 885                 if (cflag & CSTOPB) {
 886                         bits |= BITS_STOP_2;
 887                         dev_dbg(dev, "%s - stop bits = 2\n", __func__);
 888                 } else {
 889                         bits |= BITS_STOP_1;
 890                         dev_dbg(dev, "%s - stop bits = 1\n", __func__);
 891                 }
 892                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 893                         dev_dbg(dev, "Number of stop bits requested not supported by device\n");
 894         }
 895
 896         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 897                 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
 898                 dev_dbg(dev, "%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n",
 899                         __func__, modem_ctl[0], modem_ctl[1],
 900                         modem_ctl[2], modem_ctl[3]);
 901
 902                 if (cflag & CRTSCTS) {
 903                         modem_ctl[0] &= ~0x7B;
 904                         modem_ctl[0] |= 0x09;
 905                         modem_ctl[1] = 0x80;
 906                         dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
 907                 } else {
 908                         modem_ctl[0] &= ~0x7B;
 909                         modem_ctl[0] |= 0x01;
 910                         modem_ctl[1] |= 0x40;
 911                         dev_dbg(dev, "%s - flow control = NONE\n", __func__);
 912                 }
 913
 914                 dev_dbg(dev, "%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n",
 915                         __func__, modem_ctl[0], modem_ctl[1],
 916                         modem_ctl[2], modem_ctl[3]);
 917                 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16);
 918         }
 919
 920 }
 921
 922 static int cp210x_tiocmset(struct tty_struct *tty,
 923                 unsigned int set, unsigned int clear)
 924 {
 925         struct usb_serial_port *port = tty->driver_data;
 926         return cp210x_tiocmset_port(port, set, clear);
 927 }
 928
 929 static int cp210x_tiocmset_port(struct usb_serial_port *port,
 930                 unsigned int set, unsigned int clear)
 931 {
 932         unsigned int control = 0;
 933
 934         if (set & TIOCM_RTS) {
 935                 control |= CONTROL_RTS;
 936                 control |= CONTROL_WRITE_RTS;
 937         }
 938         if (set & TIOCM_DTR) {
 939                 control |= CONTROL_DTR;
 940                 control |= CONTROL_WRITE_DTR;
 941         }
 942         if (clear & TIOCM_RTS) {
 943                 control &= ~CONTROL_RTS;
 944                 control |= CONTROL_WRITE_RTS;
 945         }
 946         if (clear & TIOCM_DTR) {
 947                 control &= ~CONTROL_DTR;
 948                 control |= CONTROL_WRITE_DTR;
 949         }
 950
 951         dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
 952
 953         return cp210x_set_config(port, CP210X_SET_MHS, &control, 2);
 954 }
 955
 956 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
 957 {
 958         if (on)
 959                 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
 960         else
 961                 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
 962 }
 963
 964 static int cp210x_tiocmget(struct tty_struct *tty)
 965 {
 966         struct usb_serial_port *port = tty->driver_data;
 967         unsigned int control;
 968         int result;
 969
 970         cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1);
 971
 972         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
 973                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
 974                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
 975                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
 976                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
 977                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
 978
 979         dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
 980
 981         return result;
 982 }
 983
 984 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
 985 {
 986         struct usb_serial_port *port = tty->driver_data;
 987         unsigned int state;
 988
 989         if (break_state == 0)
 990                 state = BREAK_OFF;
 991         else
 992                 state = BREAK_ON;
 993         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
 994                 state == BREAK_OFF ? "off" : "on");
 995         cp210x_set_config(port, CP210X_SET_BREAK, &state, 2);
 996 }
 997
 998 static int cp210x_port_probe(struct usb_serial_port *port)
 999 {
1000         struct usb_serial *serial = port->serial;
1001         struct usb_host_interface *cur_altsetting;
1002         struct cp210x_port_private *port_priv;
1003         int ret;
1004
1005         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1006         if (!port_priv)
1007                 return -ENOMEM;
1008
1009         cur_altsetting = serial->interface->cur_altsetting;
1010         port_priv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber;
1011
1012         usb_set_serial_port_data(port, port_priv);
1013
1014         ret = cp210x_detect_swapped_line_ctl(port);
1015         if (ret) {
1016                 kfree(port_priv);
1017                 return ret;
1018         }
1019
1020         return 0;
1021 }
1022
1023 static int cp210x_port_remove(struct usb_serial_port *port)
1024 {
1025         struct cp210x_port_private *port_priv;
1026
1027         port_priv = usb_get_serial_port_data(port);
1028         kfree(port_priv);
1029
1030         return 0;
1031 }
1032
1033 module_usb_serial_driver(serial_drivers, id_table);
1034
1035 MODULE_DESCRIPTION(DRIVER_DESC);
1036 MODULE_LICENSE("GPL");