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 /*
  28  * Version Information
  29  */
  30 #define DRIVER_VERSION "v0.09"
  31 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
  32
  33 /*
  34  * Function Prototypes
  35  */
  36 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
  37 static void cp210x_close(struct usb_serial_port *);
  38 static void cp210x_get_termios(struct tty_struct *,
  39         struct usb_serial_port *port);
  40 static void cp210x_get_termios_port(struct usb_serial_port *port,
  41         unsigned int *cflagp, unsigned int *baudp);
  42 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
  43                                                         struct ktermios *);
  44 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
  45                                                         struct ktermios*);
  46 static int cp210x_tiocmget(struct tty_struct *);
  47 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
  48 static int cp210x_tiocmset_port(struct usb_serial_port *port,
  49                 unsigned int, unsigned int);
  50 static void cp210x_break_ctl(struct tty_struct *, int);
  51 static int cp210x_startup(struct usb_serial *);
  52 static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
  53
  54 static bool debug;
  55
  56 static const struct usb_device_id id_table[] = {
  57         { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
  58         { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
  59         { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  60         { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  61         { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
  62         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
  63         { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
  64         { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
  65         { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
  66         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  67         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
  68         { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
  69         { USB_DEVICE(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, 0x8066) }, /* Argussoft In-System Programmer */
  82         { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
  83         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  84         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  85         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
  86         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  87         { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
  88         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  89         { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
  90         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
  91         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
  92         { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
  93         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
  94         { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
  95         { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
  96         { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
  97         { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
  98         { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
  99         { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
 100         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
 101         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
 102         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
 103         { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
 104         { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
 105         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
 106         { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
 107         { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
 108         { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
 109         { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
 110         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
 111         { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
 112         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
 113         { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
 114         { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
 115         { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
 116         { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
 117         { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
 118         { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
 119         { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
 120         { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
 121         { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
 122         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 123         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 124         { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
 125         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 126         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 127         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 128         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 129         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 130         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 131         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 132         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 133         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 134         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 135         { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
 136         { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
 137         { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
 138         { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
 139         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
 140         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
 141         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 142         { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
 143         { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
 144         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 145         { } /* Terminating Entry */
 146 };
 147
 148 MODULE_DEVICE_TABLE(usb, id_table);
 149
 150 static struct usb_driver cp210x_driver = {
 151         .name           = "cp210x",
 152         .probe          = usb_serial_probe,
 153         .disconnect     = usb_serial_disconnect,
 154         .id_table       = id_table,
 155         .no_dynamic_id  =       1,
 156 };
 157
 158 static struct usb_serial_driver cp210x_device = {
 159         .driver = {
 160                 .owner =        THIS_MODULE,
 161                 .name =         "cp210x",
 162         },
 163         .usb_driver             = &cp210x_driver,
 164         .id_table               = id_table,
 165         .num_ports              = 1,
 166         .bulk_in_size           = 256,
 167         .bulk_out_size          = 256,
 168         .open                   = cp210x_open,
 169         .close                  = cp210x_close,
 170         .break_ctl              = cp210x_break_ctl,
 171         .set_termios            = cp210x_set_termios,
 172         .tiocmget               = cp210x_tiocmget,
 173         .tiocmset               = cp210x_tiocmset,
 174         .attach                 = cp210x_startup,
 175         .dtr_rts                = cp210x_dtr_rts
 176 };
 177
 178 /* Config request types */
 179 #define REQTYPE_HOST_TO_DEVICE  0x41
 180 #define REQTYPE_DEVICE_TO_HOST  0xc1
 181
 182 /* Config request codes */
 183 #define CP210X_IFC_ENABLE       0x00
 184 #define CP210X_SET_BAUDDIV      0x01
 185 #define CP210X_GET_BAUDDIV      0x02
 186 #define CP210X_SET_LINE_CTL     0x03
 187 #define CP210X_GET_LINE_CTL     0x04
 188 #define CP210X_SET_BREAK        0x05
 189 #define CP210X_IMM_CHAR         0x06
 190 #define CP210X_SET_MHS          0x07
 191 #define CP210X_GET_MDMSTS       0x08
 192 #define CP210X_SET_XON          0x09
 193 #define CP210X_SET_XOFF         0x0A
 194 #define CP210X_SET_EVENTMASK    0x0B
 195 #define CP210X_GET_EVENTMASK    0x0C
 196 #define CP210X_SET_CHAR         0x0D
 197 #define CP210X_GET_CHARS        0x0E
 198 #define CP210X_GET_PROPS        0x0F
 199 #define CP210X_GET_COMM_STATUS  0x10
 200 #define CP210X_RESET            0x11
 201 #define CP210X_PURGE            0x12
 202 #define CP210X_SET_FLOW         0x13
 203 #define CP210X_GET_FLOW         0x14
 204 #define CP210X_EMBED_EVENTS     0x15
 205 #define CP210X_GET_EVENTSTATE   0x16
 206 #define CP210X_SET_CHARS        0x19
 207 #define CP210X_GET_BAUDRATE     0x1D
 208 #define CP210X_SET_BAUDRATE     0x1E
 209
 210 /* CP210X_IFC_ENABLE */
 211 #define UART_ENABLE             0x0001
 212 #define UART_DISABLE            0x0000
 213
 214 /* CP210X_(SET|GET)_BAUDDIV */
 215 #define BAUD_RATE_GEN_FREQ      0x384000
 216
 217 /* CP210X_(SET|GET)_LINE_CTL */
 218 #define BITS_DATA_MASK          0X0f00
 219 #define BITS_DATA_5             0X0500
 220 #define BITS_DATA_6             0X0600
 221 #define BITS_DATA_7             0X0700
 222 #define BITS_DATA_8             0X0800
 223 #define BITS_DATA_9             0X0900
 224
 225 #define BITS_PARITY_MASK        0x00f0
 226 #define BITS_PARITY_NONE        0x0000
 227 #define BITS_PARITY_ODD         0x0010
 228 #define BITS_PARITY_EVEN        0x0020
 229 #define BITS_PARITY_MARK        0x0030
 230 #define BITS_PARITY_SPACE       0x0040
 231
 232 #define BITS_STOP_MASK          0x000f
 233 #define BITS_STOP_1             0x0000
 234 #define BITS_STOP_1_5           0x0001
 235 #define BITS_STOP_2             0x0002
 236
 237 /* CP210X_SET_BREAK */
 238 #define BREAK_ON                0x0001
 239 #define BREAK_OFF               0x0000
 240
 241 /* CP210X_(SET_MHS|GET_MDMSTS) */
 242 #define CONTROL_DTR             0x0001
 243 #define CONTROL_RTS             0x0002
 244 #define CONTROL_CTS             0x0010
 245 #define CONTROL_DSR             0x0020
 246 #define CONTROL_RING            0x0040
 247 #define CONTROL_DCD             0x0080
 248 #define CONTROL_WRITE_DTR       0x0100
 249 #define CONTROL_WRITE_RTS       0x0200
 250
 251 /*
 252  * cp210x_get_config
 253  * Reads from the CP210x configuration registers
 254  * 'size' is specified in bytes.
 255  * 'data' is a pointer to a pre-allocated array of integers large
 256  * enough to hold 'size' bytes (with 4 bytes to each integer)
 257  */
 258 static int cp210x_get_config(struct usb_serial_port *port, u8 request,
 259                 unsigned int *data, int size)
 260 {
 261         struct usb_serial *serial = port->serial;
 262         __le32 *buf;
 263         int result, i, length;
 264
 265         /* Number of integers required to contain the array */
 266         length = (((size - 1) | 3) + 1)/4;
 267
 268         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
 269         if (!buf) {
 270                 dev_err(&port->dev, "%s - out of memory.\n", __func__);
 271                 return -ENOMEM;
 272         }
 273
 274         /* Issue the request, attempting to read 'size' bytes */
 275         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 276                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
 277                                 0, buf, size, 300);
 278
 279         /* Convert data into an array of integers */
 280         for (i = 0; i < length; i++)
 281                 data[i] = le32_to_cpu(buf[i]);
 282
 283         kfree(buf);
 284
 285         if (result != size) {
 286                 dbg("%s - Unable to send config request, "
 287                                 "request=0x%x size=%d result=%d\n",
 288                                 __func__, request, size, result);
 289                 if (result > 0)
 290                         result = -EPROTO;
 291
 292                 return result;
 293         }
 294
 295         return 0;
 296 }
 297
 298 /*
 299  * cp210x_set_config
 300  * Writes to the CP210x configuration registers
 301  * Values less than 16 bits wide are sent directly
 302  * 'size' is specified in bytes.
 303  */
 304 static int cp210x_set_config(struct usb_serial_port *port, u8 request,
 305                 unsigned int *data, int size)
 306 {
 307         struct usb_serial *serial = port->serial;
 308         __le32 *buf;
 309         int result, i, length;
 310
 311         /* Number of integers required to contain the array */
 312         length = (((size - 1) | 3) + 1)/4;
 313
 314         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
 315         if (!buf) {
 316                 dev_err(&port->dev, "%s - out of memory.\n",
 317                                 __func__);
 318                 return -ENOMEM;
 319         }
 320
 321         /* Array of integers into bytes */
 322         for (i = 0; i < length; i++)
 323                 buf[i] = cpu_to_le32(data[i]);
 324
 325         if (size > 2) {
 326                 result = usb_control_msg(serial->dev,
 327                                 usb_sndctrlpipe(serial->dev, 0),
 328                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
 329                                 0, buf, size, 300);
 330         } else {
 331                 result = usb_control_msg(serial->dev,
 332                                 usb_sndctrlpipe(serial->dev, 0),
 333                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
 334                                 0, NULL, 0, 300);
 335         }
 336
 337         kfree(buf);
 338
 339         if ((size > 2 && result != size) || result < 0) {
 340                 dbg("%s - Unable to send request, "
 341                                 "request=0x%x size=%d result=%d\n",
 342                                 __func__, request, size, result);
 343                 if (result > 0)
 344                         result = -EPROTO;
 345
 346                 return result;
 347         }
 348
 349         return 0;
 350 }
 351
 352 /*
 353  * cp210x_set_config_single
 354  * Convenience function for calling cp210x_set_config on single data values
 355  * without requiring an integer pointer
 356  */
 357 static inline int cp210x_set_config_single(struct usb_serial_port *port,
 358                 u8 request, unsigned int data)
 359 {
 360         return cp210x_set_config(port, request, &data, 2);
 361 }
 362
 363 /*
 364  * cp210x_quantise_baudrate
 365  * Quantises the baud rate as per AN205 Table 1
 366  */
 367 static unsigned int cp210x_quantise_baudrate(unsigned int baud) {
 368         if (baud <= 300)
 369                 baud = 300;
 370         else if (baud <= 600)      baud = 600;
 371         else if (baud <= 1200)     baud = 1200;
 372         else if (baud <= 1800)     baud = 1800;
 373         else if (baud <= 2400)     baud = 2400;
 374         else if (baud <= 4000)     baud = 4000;
 375         else if (baud <= 4803)     baud = 4800;
 376         else if (baud <= 7207)     baud = 7200;
 377         else if (baud <= 9612)     baud = 9600;
 378         else if (baud <= 14428)    baud = 14400;
 379         else if (baud <= 16062)    baud = 16000;
 380         else if (baud <= 19250)    baud = 19200;
 381         else if (baud <= 28912)    baud = 28800;
 382         else if (baud <= 38601)    baud = 38400;
 383         else if (baud <= 51558)    baud = 51200;
 384         else if (baud <= 56280)    baud = 56000;
 385         else if (baud <= 58053)    baud = 57600;
 386         else if (baud <= 64111)    baud = 64000;
 387         else if (baud <= 77608)    baud = 76800;
 388         else if (baud <= 117028)   baud = 115200;
 389         else if (baud <= 129347)   baud = 128000;
 390         else if (baud <= 156868)   baud = 153600;
 391         else if (baud <= 237832)   baud = 230400;
 392         else if (baud <= 254234)   baud = 250000;
 393         else if (baud <= 273066)   baud = 256000;
 394         else if (baud <= 491520)   baud = 460800;
 395         else if (baud <= 567138)   baud = 500000;
 396         else if (baud <= 670254)   baud = 576000;
 397         else if (baud < 1000000)
 398                 baud = 921600;
 399         else if (baud > 2000000)
 400                 baud = 2000000;
 401         return baud;
 402 }
 403
 404 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 405 {
 406         int result;
 407
 408         dbg("%s - port %d", __func__, port->number);
 409
 410         result = cp210x_set_config_single(port, CP210X_IFC_ENABLE,
 411                                                                 UART_ENABLE);
 412         if (result) {
 413                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
 414                 return result;
 415         }
 416
 417         /* Configure the termios structure */
 418         cp210x_get_termios(tty, port);
 419
 420         /* The baud rate must be initialised on cp2104 */
 421         if (tty)
 422                 cp210x_change_speed(tty, port, NULL);
 423
 424         return usb_serial_generic_open(tty, port);
 425 }
 426
 427 static void cp210x_close(struct usb_serial_port *port)
 428 {
 429         dbg("%s - port %d", __func__, port->number);
 430
 431         usb_serial_generic_close(port);
 432
 433         mutex_lock(&port->serial->disc_mutex);
 434         if (!port->serial->disconnected)
 435                 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE);
 436         mutex_unlock(&port->serial->disc_mutex);
 437 }
 438
 439 /*
 440  * cp210x_get_termios
 441  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 442  * from the device, corrects any unsupported values, and configures the
 443  * termios structure to reflect the state of the device
 444  */
 445 static void cp210x_get_termios(struct tty_struct *tty,
 446         struct usb_serial_port *port)
 447 {
 448         unsigned int baud;
 449
 450         if (tty) {
 451                 cp210x_get_termios_port(tty->driver_data,
 452                         &tty->termios->c_cflag, &baud);
 453                 tty_encode_baud_rate(tty, baud, baud);
 454         }
 455
 456         else {
 457                 unsigned int cflag;
 458                 cflag = 0;
 459                 cp210x_get_termios_port(port, &cflag, &baud);
 460         }
 461 }
 462
 463 /*
 464  * cp210x_get_termios_port
 465  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
 466  */
 467 static void cp210x_get_termios_port(struct usb_serial_port *port,
 468         unsigned int *cflagp, unsigned int *baudp)
 469 {
 470         unsigned int cflag, modem_ctl[4];
 471         unsigned int baud;
 472         unsigned int bits;
 473
 474         dbg("%s - port %d", __func__, port->number);
 475
 476         cp210x_get_config(port, CP210X_GET_BAUDRATE, &baud, 4);
 477
 478         dbg("%s - baud rate = %d", __func__, baud);
 479         *baudp = baud;
 480
 481         cflag = *cflagp;
 482
 483         cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 484         cflag &= ~CSIZE;
 485         switch (bits & BITS_DATA_MASK) {
 486         case BITS_DATA_5:
 487                 dbg("%s - data bits = 5", __func__);
 488                 cflag |= CS5;
 489                 break;
 490         case BITS_DATA_6:
 491                 dbg("%s - data bits = 6", __func__);
 492                 cflag |= CS6;
 493                 break;
 494         case BITS_DATA_7:
 495                 dbg("%s - data bits = 7", __func__);
 496                 cflag |= CS7;
 497                 break;
 498         case BITS_DATA_8:
 499                 dbg("%s - data bits = 8", __func__);
 500                 cflag |= CS8;
 501                 break;
 502         case BITS_DATA_9:
 503                 dbg("%s - data bits = 9 (not supported, using 8 data bits)",
 504                                                                 __func__);
 505                 cflag |= CS8;
 506                 bits &= ~BITS_DATA_MASK;
 507                 bits |= BITS_DATA_8;
 508                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 509                 break;
 510         default:
 511                 dbg("%s - Unknown number of data bits, using 8", __func__);
 512                 cflag |= CS8;
 513                 bits &= ~BITS_DATA_MASK;
 514                 bits |= BITS_DATA_8;
 515                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 516                 break;
 517         }
 518
 519         switch (bits & BITS_PARITY_MASK) {
 520         case BITS_PARITY_NONE:
 521                 dbg("%s - parity = NONE", __func__);
 522                 cflag &= ~PARENB;
 523                 break;
 524         case BITS_PARITY_ODD:
 525                 dbg("%s - parity = ODD", __func__);
 526                 cflag |= (PARENB|PARODD);
 527                 break;
 528         case BITS_PARITY_EVEN:
 529                 dbg("%s - parity = EVEN", __func__);
 530                 cflag &= ~PARODD;
 531                 cflag |= PARENB;
 532                 break;
 533         case BITS_PARITY_MARK:
 534                 dbg("%s - parity = MARK", __func__);
 535                 cflag |= (PARENB|PARODD|CMSPAR);
 536                 break;
 537         case BITS_PARITY_SPACE:
 538                 dbg("%s - parity = SPACE", __func__);
 539                 cflag &= ~PARODD;
 540                 cflag |= (PARENB|CMSPAR);
 541                 break;
 542         default:
 543                 dbg("%s - Unknown parity mode, disabling parity", __func__);
 544                 cflag &= ~PARENB;
 545                 bits &= ~BITS_PARITY_MASK;
 546                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 547                 break;
 548         }
 549
 550         cflag &= ~CSTOPB;
 551         switch (bits & BITS_STOP_MASK) {
 552         case BITS_STOP_1:
 553                 dbg("%s - stop bits = 1", __func__);
 554                 break;
 555         case BITS_STOP_1_5:
 556                 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)",
 557                                                                 __func__);
 558                 bits &= ~BITS_STOP_MASK;
 559                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 560                 break;
 561         case BITS_STOP_2:
 562                 dbg("%s - stop bits = 2", __func__);
 563                 cflag |= CSTOPB;
 564                 break;
 565         default:
 566                 dbg("%s - Unknown number of stop bits, using 1 stop bit",
 567                                                                 __func__);
 568                 bits &= ~BITS_STOP_MASK;
 569                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 570                 break;
 571         }
 572
 573         cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
 574         if (modem_ctl[0] & 0x0008) {
 575                 dbg("%s - flow control = CRTSCTS", __func__);
 576                 cflag |= CRTSCTS;
 577         } else {
 578                 dbg("%s - flow control = NONE", __func__);
 579                 cflag &= ~CRTSCTS;
 580         }
 581
 582         *cflagp = cflag;
 583 }
 584
 585 /*
 586  * CP2101 supports the following baud rates:
 587  *
 588  *      300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
 589  *      38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
 590  *
 591  * CP2102 and CP2103 support the following additional rates:
 592  *
 593  *      4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
 594  *      576000
 595  *
 596  * The device will map a requested rate to a supported one, but the result
 597  * of requests for rates greater than 1053257 is undefined (see AN205).
 598  *
 599  * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
 600  * respectively, with an error less than 1%. The actual rates are determined
 601  * by
 602  *
 603  *      div = round(freq / (2 x prescale x request))
 604  *      actual = freq / (2 x prescale x div)
 605  *
 606  * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
 607  * or 1 otherwise.
 608  * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
 609  * otherwise.
 610  */
 611 static void cp210x_change_speed(struct tty_struct *tty,
 612                 struct usb_serial_port *port, struct ktermios *old_termios)
 613 {
 614         u32 baud;
 615
 616         baud = tty->termios->c_ospeed;
 617
 618         /* This maps the requested rate to a rate valid on cp2102 or cp2103,
 619          * or to an arbitrary rate in [1M,2M].
 620          *
 621          * NOTE: B0 is not implemented.
 622          */
 623         baud = cp210x_quantise_baudrate(baud);
 624
 625         dbg("%s - setting baud rate to %u", __func__, baud);
 626         if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud,
 627                                                         sizeof(baud))) {
 628                 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
 629                 if (old_termios)
 630                         baud = old_termios->c_ospeed;
 631                 else
 632                         baud = 9600;
 633         }
 634
 635         tty_encode_baud_rate(tty, baud, baud);
 636 }
 637
 638 static void cp210x_set_termios(struct tty_struct *tty,
 639                 struct usb_serial_port *port, struct ktermios *old_termios)
 640 {
 641         unsigned int cflag, old_cflag;
 642         unsigned int bits;
 643         unsigned int modem_ctl[4];
 644
 645         dbg("%s - port %d", __func__, port->number);
 646
 647         if (!tty)
 648                 return;
 649
 650         cflag = tty->termios->c_cflag;
 651         old_cflag = old_termios->c_cflag;
 652
 653         if (tty->termios->c_ospeed != old_termios->c_ospeed)
 654                 cp210x_change_speed(tty, port, old_termios);
 655
 656         /* If the number of data bits is to be updated */
 657         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 658                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 659                 bits &= ~BITS_DATA_MASK;
 660                 switch (cflag & CSIZE) {
 661                 case CS5:
 662                         bits |= BITS_DATA_5;
 663                         dbg("%s - data bits = 5", __func__);
 664                         break;
 665                 case CS6:
 666                         bits |= BITS_DATA_6;
 667                         dbg("%s - data bits = 6", __func__);
 668                         break;
 669                 case CS7:
 670                         bits |= BITS_DATA_7;
 671                         dbg("%s - data bits = 7", __func__);
 672                         break;
 673                 case CS8:
 674                         bits |= BITS_DATA_8;
 675                         dbg("%s - data bits = 8", __func__);
 676                         break;
 677                 /*case CS9:
 678                         bits |= BITS_DATA_9;
 679                         dbg("%s - data bits = 9", __func__);
 680                         break;*/
 681                 default:
 682                         dbg("cp210x driver does not "
 683                                         "support the number of bits requested,"
 684                                         " using 8 bit mode\n");
 685                                 bits |= BITS_DATA_8;
 686                                 break;
 687                 }
 688                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 689                         dbg("Number of data bits requested "
 690                                         "not supported by device\n");
 691         }
 692
 693         if ((cflag     & (PARENB|PARODD|CMSPAR)) !=
 694             (old_cflag & (PARENB|PARODD|CMSPAR))) {
 695                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 696                 bits &= ~BITS_PARITY_MASK;
 697                 if (cflag & PARENB) {
 698                         if (cflag & CMSPAR) {
 699                             if (cflag & PARODD) {
 700                                     bits |= BITS_PARITY_MARK;
 701                                     dbg("%s - parity = MARK", __func__);
 702                             } else {
 703                                     bits |= BITS_PARITY_SPACE;
 704                                     dbg("%s - parity = SPACE", __func__);
 705                             }
 706                         } else {
 707                             if (cflag & PARODD) {
 708                                     bits |= BITS_PARITY_ODD;
 709                                     dbg("%s - parity = ODD", __func__);
 710                             } else {
 711                                     bits |= BITS_PARITY_EVEN;
 712                                     dbg("%s - parity = EVEN", __func__);
 713                             }
 714                         }
 715                 }
 716                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 717                         dbg("Parity mode not supported "
 718                                         "by device\n");
 719         }
 720
 721         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 722                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 723                 bits &= ~BITS_STOP_MASK;
 724                 if (cflag & CSTOPB) {
 725                         bits |= BITS_STOP_2;
 726                         dbg("%s - stop bits = 2", __func__);
 727                 } else {
 728                         bits |= BITS_STOP_1;
 729                         dbg("%s - stop bits = 1", __func__);
 730                 }
 731                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 732                         dbg("Number of stop bits requested "
 733                                         "not supported by device\n");
 734         }
 735
 736         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 737                 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
 738                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 739                                 __func__, modem_ctl[0], modem_ctl[1],
 740                                 modem_ctl[2], modem_ctl[3]);
 741
 742                 if (cflag & CRTSCTS) {
 743                         modem_ctl[0] &= ~0x7B;
 744                         modem_ctl[0] |= 0x09;
 745                         modem_ctl[1] = 0x80;
 746                         dbg("%s - flow control = CRTSCTS", __func__);
 747                 } else {
 748                         modem_ctl[0] &= ~0x7B;
 749                         modem_ctl[0] |= 0x01;
 750                         modem_ctl[1] |= 0x40;
 751                         dbg("%s - flow control = NONE", __func__);
 752                 }
 753
 754                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 755                                 __func__, modem_ctl[0], modem_ctl[1],
 756                                 modem_ctl[2], modem_ctl[3]);
 757                 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16);
 758         }
 759
 760 }
 761
 762 static int cp210x_tiocmset (struct tty_struct *tty,
 763                 unsigned int set, unsigned int clear)
 764 {
 765         struct usb_serial_port *port = tty->driver_data;
 766         return cp210x_tiocmset_port(port, set, clear);
 767 }
 768
 769 static int cp210x_tiocmset_port(struct usb_serial_port *port,
 770                 unsigned int set, unsigned int clear)
 771 {
 772         unsigned int control = 0;
 773
 774         dbg("%s - port %d", __func__, port->number);
 775
 776         if (set & TIOCM_RTS) {
 777                 control |= CONTROL_RTS;
 778                 control |= CONTROL_WRITE_RTS;
 779         }
 780         if (set & TIOCM_DTR) {
 781                 control |= CONTROL_DTR;
 782                 control |= CONTROL_WRITE_DTR;
 783         }
 784         if (clear & TIOCM_RTS) {
 785                 control &= ~CONTROL_RTS;
 786                 control |= CONTROL_WRITE_RTS;
 787         }
 788         if (clear & TIOCM_DTR) {
 789                 control &= ~CONTROL_DTR;
 790                 control |= CONTROL_WRITE_DTR;
 791         }
 792
 793         dbg("%s - control = 0x%.4x", __func__, control);
 794
 795         return cp210x_set_config(port, CP210X_SET_MHS, &control, 2);
 796 }
 797
 798 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
 799 {
 800         if (on)
 801                 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
 802         else
 803                 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
 804 }
 805
 806 static int cp210x_tiocmget (struct tty_struct *tty)
 807 {
 808         struct usb_serial_port *port = tty->driver_data;
 809         unsigned int control;
 810         int result;
 811
 812         dbg("%s - port %d", __func__, port->number);
 813
 814         cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1);
 815
 816         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
 817                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
 818                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
 819                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
 820                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
 821                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
 822
 823         dbg("%s - control = 0x%.2x", __func__, control);
 824
 825         return result;
 826 }
 827
 828 static void cp210x_break_ctl (struct tty_struct *tty, int break_state)
 829 {
 830         struct usb_serial_port *port = tty->driver_data;
 831         unsigned int state;
 832
 833         dbg("%s - port %d", __func__, port->number);
 834         if (break_state == 0)
 835                 state = BREAK_OFF;
 836         else
 837                 state = BREAK_ON;
 838         dbg("%s - turning break %s", __func__,
 839                         state == BREAK_OFF ? "off" : "on");
 840         cp210x_set_config(port, CP210X_SET_BREAK, &state, 2);
 841 }
 842
 843 static int cp210x_startup(struct usb_serial *serial)
 844 {
 845         /* cp210x buffers behave strangely unless device is reset */
 846         usb_reset_device(serial->dev);
 847         return 0;
 848 }
 849
 850 static int __init cp210x_init(void)
 851 {
 852         int retval;
 853
 854         retval = usb_serial_register(&cp210x_device);
 855         if (retval)
 856                 return retval; /* Failed to register */
 857
 858         retval = usb_register(&cp210x_driver);
 859         if (retval) {
 860                 /* Failed to register */
 861                 usb_serial_deregister(&cp210x_device);
 862                 return retval;
 863         }
 864
 865         /* Success */
 866         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 867                DRIVER_DESC "\n");
 868         return 0;
 869 }
 870
 871 static void __exit cp210x_exit(void)
 872 {
 873         usb_deregister(&cp210x_driver);
 874         usb_serial_deregister(&cp210x_device);
 875 }
 876
 877 module_init(cp210x_init);
 878 module_exit(cp210x_exit);
 879
 880 MODULE_DESCRIPTION(DRIVER_DESC);
 881 MODULE_VERSION(DRIVER_VERSION);
 882 MODULE_LICENSE("GPL");
 883
 884 module_param(debug, bool, S_IRUGO | S_IWUSR);
 885 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");