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_release(struct usb_serial *);
  53 static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
  54
  55 static bool debug;
  56
  57 static const struct usb_device_id id_table[] = {
  58         { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
  59         { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
  60         { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  61         { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  62         { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
  63         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
  64         { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
  65         { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
  66         { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
  67         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  68         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
  69         { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
  70         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  71         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  72         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  73         { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
  74         { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
  75         { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
  76         { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
  77         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  78         { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
  79         { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
  80         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
  81         { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
  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(0x10C4, 0x8156) }, /* B&G H3000 link cable */
  95         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
  96         { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
  97         { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
  98         { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
  99         { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
 100         { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
 101         { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
 102         { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
 103         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
 104         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
 105         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
 106         { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
 107         { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
 108         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
 109         { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
 110         { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
 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, 0x8664) }, /* AC-Services CAN-IF */
 124         { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
 125         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 126         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 127         { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
 128         { USB_DEVICE(0x10C4, 0xEA80) }, /* Silicon Labs factory default */
 129         { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
 130         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 131         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 132         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 133         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 134         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 135         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 136         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 137         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 138         { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
 139         { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
 140         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 141         { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
 142         { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
 143         { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
 144         { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
 145         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 146         { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
 147         { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
 148         { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
 149         { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
 150         { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
 151         { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
 152         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
 153         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
 154         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 155         { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
 156         { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
 157         { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
 158         { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
 159         { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
 160         { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
 161         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 162         { } /* Terminating Entry */
 163 };
 164
 165 MODULE_DEVICE_TABLE(usb, id_table);
 166
 167 struct cp210x_port_private {
 168         __u8                    bInterfaceNumber;
 169 };
 170
 171 static struct usb_serial_driver cp210x_device = {
 172         .driver = {
 173                 .owner =        THIS_MODULE,
 174                 .name =         "cp210x",
 175         },
 176         .id_table               = id_table,
 177         .num_ports              = 1,
 178         .bulk_in_size           = 256,
 179         .bulk_out_size          = 256,
 180         .open                   = cp210x_open,
 181         .close                  = cp210x_close,
 182         .break_ctl              = cp210x_break_ctl,
 183         .set_termios            = cp210x_set_termios,
 184         .tiocmget               = cp210x_tiocmget,
 185         .tiocmset               = cp210x_tiocmset,
 186         .attach                 = cp210x_startup,
 187         .release                = cp210x_release,
 188         .dtr_rts                = cp210x_dtr_rts
 189 };
 190
 191 static struct usb_serial_driver * const serial_drivers[] = {
 192         &cp210x_device, NULL
 193 };
 194
 195 /* Config request types */
 196 #define REQTYPE_HOST_TO_INTERFACE       0x41
 197 #define REQTYPE_INTERFACE_TO_HOST       0xc1
 198 #define REQTYPE_HOST_TO_DEVICE  0x40
 199 #define REQTYPE_DEVICE_TO_HOST  0xc0
 200
 201 /* Config request codes */
 202 #define CP210X_IFC_ENABLE       0x00
 203 #define CP210X_SET_BAUDDIV      0x01
 204 #define CP210X_GET_BAUDDIV      0x02
 205 #define CP210X_SET_LINE_CTL     0x03
 206 #define CP210X_GET_LINE_CTL     0x04
 207 #define CP210X_SET_BREAK        0x05
 208 #define CP210X_IMM_CHAR         0x06
 209 #define CP210X_SET_MHS          0x07
 210 #define CP210X_GET_MDMSTS       0x08
 211 #define CP210X_SET_XON          0x09
 212 #define CP210X_SET_XOFF         0x0A
 213 #define CP210X_SET_EVENTMASK    0x0B
 214 #define CP210X_GET_EVENTMASK    0x0C
 215 #define CP210X_SET_CHAR         0x0D
 216 #define CP210X_GET_CHARS        0x0E
 217 #define CP210X_GET_PROPS        0x0F
 218 #define CP210X_GET_COMM_STATUS  0x10
 219 #define CP210X_RESET            0x11
 220 #define CP210X_PURGE            0x12
 221 #define CP210X_SET_FLOW         0x13
 222 #define CP210X_GET_FLOW         0x14
 223 #define CP210X_EMBED_EVENTS     0x15
 224 #define CP210X_GET_EVENTSTATE   0x16
 225 #define CP210X_SET_CHARS        0x19
 226 #define CP210X_GET_BAUDRATE     0x1D
 227 #define CP210X_SET_BAUDRATE     0x1E
 228
 229 /* CP210X_IFC_ENABLE */
 230 #define UART_ENABLE             0x0001
 231 #define UART_DISABLE            0x0000
 232
 233 /* CP210X_(SET|GET)_BAUDDIV */
 234 #define BAUD_RATE_GEN_FREQ      0x384000
 235
 236 /* CP210X_(SET|GET)_LINE_CTL */
 237 #define BITS_DATA_MASK          0X0f00
 238 #define BITS_DATA_5             0X0500
 239 #define BITS_DATA_6             0X0600
 240 #define BITS_DATA_7             0X0700
 241 #define BITS_DATA_8             0X0800
 242 #define BITS_DATA_9             0X0900
 243
 244 #define BITS_PARITY_MASK        0x00f0
 245 #define BITS_PARITY_NONE        0x0000
 246 #define BITS_PARITY_ODD         0x0010
 247 #define BITS_PARITY_EVEN        0x0020
 248 #define BITS_PARITY_MARK        0x0030
 249 #define BITS_PARITY_SPACE       0x0040
 250
 251 #define BITS_STOP_MASK          0x000f
 252 #define BITS_STOP_1             0x0000
 253 #define BITS_STOP_1_5           0x0001
 254 #define BITS_STOP_2             0x0002
 255
 256 /* CP210X_SET_BREAK */
 257 #define BREAK_ON                0x0001
 258 #define BREAK_OFF               0x0000
 259
 260 /* CP210X_(SET_MHS|GET_MDMSTS) */
 261 #define CONTROL_DTR             0x0001
 262 #define CONTROL_RTS             0x0002
 263 #define CONTROL_CTS             0x0010
 264 #define CONTROL_DSR             0x0020
 265 #define CONTROL_RING            0x0040
 266 #define CONTROL_DCD             0x0080
 267 #define CONTROL_WRITE_DTR       0x0100
 268 #define CONTROL_WRITE_RTS       0x0200
 269
 270 /*
 271  * cp210x_get_config
 272  * Reads from the CP210x configuration registers
 273  * 'size' is specified in bytes.
 274  * 'data' is a pointer to a pre-allocated array of integers large
 275  * enough to hold 'size' bytes (with 4 bytes to each integer)
 276  */
 277 static int cp210x_get_config(struct usb_serial_port *port, u8 request,
 278                 unsigned int *data, int size)
 279 {
 280         struct usb_serial *serial = port->serial;
 281         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 282         __le32 *buf;
 283         int result, i, length;
 284
 285         /* Number of integers required to contain the array */
 286         length = (((size - 1) | 3) + 1)/4;
 287
 288         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
 289         if (!buf) {
 290                 dev_err(&port->dev, "%s - out of memory.\n", __func__);
 291                 return -ENOMEM;
 292         }
 293
 294         /* Issue the request, attempting to read 'size' bytes */
 295         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 296                                 request, REQTYPE_INTERFACE_TO_HOST, 0x0000,
 297                                 port_priv->bInterfaceNumber, buf, size,
 298                                 USB_CTRL_GET_TIMEOUT);
 299
 300         /* Convert data into an array of integers */
 301         for (i = 0; i < length; i++)
 302                 data[i] = le32_to_cpu(buf[i]);
 303
 304         kfree(buf);
 305
 306         if (result != size) {
 307                 dbg("%s - Unable to send config request, "
 308                                 "request=0x%x size=%d result=%d",
 309                                 __func__, request, size, result);
 310                 if (result > 0)
 311                         result = -EPROTO;
 312
 313                 return result;
 314         }
 315
 316         return 0;
 317 }
 318
 319 /*
 320  * cp210x_set_config
 321  * Writes to the CP210x configuration registers
 322  * Values less than 16 bits wide are sent directly
 323  * 'size' is specified in bytes.
 324  */
 325 static int cp210x_set_config(struct usb_serial_port *port, u8 request,
 326                 unsigned int *data, int size)
 327 {
 328         struct usb_serial *serial = port->serial;
 329         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 330         __le32 *buf;
 331         int result, i, length;
 332
 333         /* Number of integers required to contain the array */
 334         length = (((size - 1) | 3) + 1)/4;
 335
 336         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
 337         if (!buf) {
 338                 dev_err(&port->dev, "%s - out of memory.\n",
 339                                 __func__);
 340                 return -ENOMEM;
 341         }
 342
 343         /* Array of integers into bytes */
 344         for (i = 0; i < length; i++)
 345                 buf[i] = cpu_to_le32(data[i]);
 346
 347         if (size > 2) {
 348                 result = usb_control_msg(serial->dev,
 349                                 usb_sndctrlpipe(serial->dev, 0),
 350                                 request, REQTYPE_HOST_TO_INTERFACE, 0x0000,
 351                                 port_priv->bInterfaceNumber, buf, size,
 352                                 USB_CTRL_SET_TIMEOUT);
 353         } else {
 354                 result = usb_control_msg(serial->dev,
 355                                 usb_sndctrlpipe(serial->dev, 0),
 356                                 request, REQTYPE_HOST_TO_INTERFACE, data[0],
 357                                 port_priv->bInterfaceNumber, NULL, 0,
 358                                 USB_CTRL_SET_TIMEOUT);
 359         }
 360
 361         kfree(buf);
 362
 363         if ((size > 2 && result != size) || result < 0) {
 364                 dbg("%s - Unable to send request, "
 365                                 "request=0x%x size=%d result=%d",
 366                                 __func__, request, size, result);
 367                 if (result > 0)
 368                         result = -EPROTO;
 369
 370                 return result;
 371         }
 372
 373         return 0;
 374 }
 375
 376 /*
 377  * cp210x_set_config_single
 378  * Convenience function for calling cp210x_set_config on single data values
 379  * without requiring an integer pointer
 380  */
 381 static inline int cp210x_set_config_single(struct usb_serial_port *port,
 382                 u8 request, unsigned int data)
 383 {
 384         return cp210x_set_config(port, request, &data, 2);
 385 }
 386
 387 /*
 388  * cp210x_quantise_baudrate
 389  * Quantises the baud rate as per AN205 Table 1
 390  */
 391 static unsigned int cp210x_quantise_baudrate(unsigned int baud) {
 392         if (baud <= 300)
 393                 baud = 300;
 394         else if (baud <= 600)      baud = 600;
 395         else if (baud <= 1200)     baud = 1200;
 396         else if (baud <= 1800)     baud = 1800;
 397         else if (baud <= 2400)     baud = 2400;
 398         else if (baud <= 4000)     baud = 4000;
 399         else if (baud <= 4803)     baud = 4800;
 400         else if (baud <= 7207)     baud = 7200;
 401         else if (baud <= 9612)     baud = 9600;
 402         else if (baud <= 14428)    baud = 14400;
 403         else if (baud <= 16062)    baud = 16000;
 404         else if (baud <= 19250)    baud = 19200;
 405         else if (baud <= 28912)    baud = 28800;
 406         else if (baud <= 38601)    baud = 38400;
 407         else if (baud <= 51558)    baud = 51200;
 408         else if (baud <= 56280)    baud = 56000;
 409         else if (baud <= 58053)    baud = 57600;
 410         else if (baud <= 64111)    baud = 64000;
 411         else if (baud <= 77608)    baud = 76800;
 412         else if (baud <= 117028)   baud = 115200;
 413         else if (baud <= 129347)   baud = 128000;
 414         else if (baud <= 156868)   baud = 153600;
 415         else if (baud <= 237832)   baud = 230400;
 416         else if (baud <= 254234)   baud = 250000;
 417         else if (baud <= 273066)   baud = 256000;
 418         else if (baud <= 491520)   baud = 460800;
 419         else if (baud <= 567138)   baud = 500000;
 420         else if (baud <= 670254)   baud = 576000;
 421         else if (baud < 1000000)
 422                 baud = 921600;
 423         else if (baud > 2000000)
 424                 baud = 2000000;
 425         return baud;
 426 }
 427
 428 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 429 {
 430         int result;
 431
 432         result = cp210x_set_config_single(port, CP210X_IFC_ENABLE,
 433                                                                 UART_ENABLE);
 434         if (result) {
 435                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
 436                 return result;
 437         }
 438
 439         /* Configure the termios structure */
 440         cp210x_get_termios(tty, port);
 441
 442         /* The baud rate must be initialised on cp2104 */
 443         if (tty)
 444                 cp210x_change_speed(tty, port, NULL);
 445
 446         return usb_serial_generic_open(tty, port);
 447 }
 448
 449 static void cp210x_close(struct usb_serial_port *port)
 450 {
 451         usb_serial_generic_close(port);
 452
 453         mutex_lock(&port->serial->disc_mutex);
 454         if (!port->serial->disconnected)
 455                 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE);
 456         mutex_unlock(&port->serial->disc_mutex);
 457 }
 458
 459 /*
 460  * cp210x_get_termios
 461  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 462  * from the device, corrects any unsupported values, and configures the
 463  * termios structure to reflect the state of the device
 464  */
 465 static void cp210x_get_termios(struct tty_struct *tty,
 466         struct usb_serial_port *port)
 467 {
 468         unsigned int baud;
 469
 470         if (tty) {
 471                 cp210x_get_termios_port(tty->driver_data,
 472                         &tty->termios->c_cflag, &baud);
 473                 tty_encode_baud_rate(tty, baud, baud);
 474         }
 475
 476         else {
 477                 unsigned int cflag;
 478                 cflag = 0;
 479                 cp210x_get_termios_port(port, &cflag, &baud);
 480         }
 481 }
 482
 483 /*
 484  * cp210x_get_termios_port
 485  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
 486  */
 487 static void cp210x_get_termios_port(struct usb_serial_port *port,
 488         unsigned int *cflagp, unsigned int *baudp)
 489 {
 490         unsigned int cflag, modem_ctl[4];
 491         unsigned int baud;
 492         unsigned int bits;
 493
 494         cp210x_get_config(port, CP210X_GET_BAUDRATE, &baud, 4);
 495
 496         dbg("%s - baud rate = %d", __func__, baud);
 497         *baudp = baud;
 498
 499         cflag = *cflagp;
 500
 501         cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 502         cflag &= ~CSIZE;
 503         switch (bits & BITS_DATA_MASK) {
 504         case BITS_DATA_5:
 505                 dbg("%s - data bits = 5", __func__);
 506                 cflag |= CS5;
 507                 break;
 508         case BITS_DATA_6:
 509                 dbg("%s - data bits = 6", __func__);
 510                 cflag |= CS6;
 511                 break;
 512         case BITS_DATA_7:
 513                 dbg("%s - data bits = 7", __func__);
 514                 cflag |= CS7;
 515                 break;
 516         case BITS_DATA_8:
 517                 dbg("%s - data bits = 8", __func__);
 518                 cflag |= CS8;
 519                 break;
 520         case BITS_DATA_9:
 521                 dbg("%s - data bits = 9 (not supported, using 8 data bits)",
 522                                                                 __func__);
 523                 cflag |= CS8;
 524                 bits &= ~BITS_DATA_MASK;
 525                 bits |= BITS_DATA_8;
 526                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 527                 break;
 528         default:
 529                 dbg("%s - Unknown number of data bits, using 8", __func__);
 530                 cflag |= CS8;
 531                 bits &= ~BITS_DATA_MASK;
 532                 bits |= BITS_DATA_8;
 533                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 534                 break;
 535         }
 536
 537         switch (bits & BITS_PARITY_MASK) {
 538         case BITS_PARITY_NONE:
 539                 dbg("%s - parity = NONE", __func__);
 540                 cflag &= ~PARENB;
 541                 break;
 542         case BITS_PARITY_ODD:
 543                 dbg("%s - parity = ODD", __func__);
 544                 cflag |= (PARENB|PARODD);
 545                 break;
 546         case BITS_PARITY_EVEN:
 547                 dbg("%s - parity = EVEN", __func__);
 548                 cflag &= ~PARODD;
 549                 cflag |= PARENB;
 550                 break;
 551         case BITS_PARITY_MARK:
 552                 dbg("%s - parity = MARK", __func__);
 553                 cflag |= (PARENB|PARODD|CMSPAR);
 554                 break;
 555         case BITS_PARITY_SPACE:
 556                 dbg("%s - parity = SPACE", __func__);
 557                 cflag &= ~PARODD;
 558                 cflag |= (PARENB|CMSPAR);
 559                 break;
 560         default:
 561                 dbg("%s - Unknown parity mode, disabling parity", __func__);
 562                 cflag &= ~PARENB;
 563                 bits &= ~BITS_PARITY_MASK;
 564                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 565                 break;
 566         }
 567
 568         cflag &= ~CSTOPB;
 569         switch (bits & BITS_STOP_MASK) {
 570         case BITS_STOP_1:
 571                 dbg("%s - stop bits = 1", __func__);
 572                 break;
 573         case BITS_STOP_1_5:
 574                 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)",
 575                                                                 __func__);
 576                 bits &= ~BITS_STOP_MASK;
 577                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 578                 break;
 579         case BITS_STOP_2:
 580                 dbg("%s - stop bits = 2", __func__);
 581                 cflag |= CSTOPB;
 582                 break;
 583         default:
 584                 dbg("%s - Unknown number of stop bits, using 1 stop bit",
 585                                                                 __func__);
 586                 bits &= ~BITS_STOP_MASK;
 587                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 588                 break;
 589         }
 590
 591         cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
 592         if (modem_ctl[0] & 0x0008) {
 593                 dbg("%s - flow control = CRTSCTS", __func__);
 594                 cflag |= CRTSCTS;
 595         } else {
 596                 dbg("%s - flow control = NONE", __func__);
 597                 cflag &= ~CRTSCTS;
 598         }
 599
 600         *cflagp = cflag;
 601 }
 602
 603 /*
 604  * CP2101 supports the following baud rates:
 605  *
 606  *      300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
 607  *      38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
 608  *
 609  * CP2102 and CP2103 support the following additional rates:
 610  *
 611  *      4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
 612  *      576000
 613  *
 614  * The device will map a requested rate to a supported one, but the result
 615  * of requests for rates greater than 1053257 is undefined (see AN205).
 616  *
 617  * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
 618  * respectively, with an error less than 1%. The actual rates are determined
 619  * by
 620  *
 621  *      div = round(freq / (2 x prescale x request))
 622  *      actual = freq / (2 x prescale x div)
 623  *
 624  * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
 625  * or 1 otherwise.
 626  * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
 627  * otherwise.
 628  */
 629 static void cp210x_change_speed(struct tty_struct *tty,
 630                 struct usb_serial_port *port, struct ktermios *old_termios)
 631 {
 632         u32 baud;
 633
 634         baud = tty->termios->c_ospeed;
 635
 636         /* This maps the requested rate to a rate valid on cp2102 or cp2103,
 637          * or to an arbitrary rate in [1M,2M].
 638          *
 639          * NOTE: B0 is not implemented.
 640          */
 641         baud = cp210x_quantise_baudrate(baud);
 642
 643         dbg("%s - setting baud rate to %u", __func__, baud);
 644         if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud,
 645                                                         sizeof(baud))) {
 646                 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
 647                 if (old_termios)
 648                         baud = old_termios->c_ospeed;
 649                 else
 650                         baud = 9600;
 651         }
 652
 653         tty_encode_baud_rate(tty, baud, baud);
 654 }
 655
 656 static void cp210x_set_termios(struct tty_struct *tty,
 657                 struct usb_serial_port *port, struct ktermios *old_termios)
 658 {
 659         unsigned int cflag, old_cflag;
 660         unsigned int bits;
 661         unsigned int modem_ctl[4];
 662
 663         dbg("%s - port %d", __func__, port->number);
 664
 665         if (!tty)
 666                 return;
 667
 668         cflag = tty->termios->c_cflag;
 669         old_cflag = old_termios->c_cflag;
 670
 671         if (tty->termios->c_ospeed != old_termios->c_ospeed)
 672                 cp210x_change_speed(tty, port, old_termios);
 673
 674         /* If the number of data bits is to be updated */
 675         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 676                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 677                 bits &= ~BITS_DATA_MASK;
 678                 switch (cflag & CSIZE) {
 679                 case CS5:
 680                         bits |= BITS_DATA_5;
 681                         dbg("%s - data bits = 5", __func__);
 682                         break;
 683                 case CS6:
 684                         bits |= BITS_DATA_6;
 685                         dbg("%s - data bits = 6", __func__);
 686                         break;
 687                 case CS7:
 688                         bits |= BITS_DATA_7;
 689                         dbg("%s - data bits = 7", __func__);
 690                         break;
 691                 case CS8:
 692                         bits |= BITS_DATA_8;
 693                         dbg("%s - data bits = 8", __func__);
 694                         break;
 695                 /*case CS9:
 696                         bits |= BITS_DATA_9;
 697                         dbg("%s - data bits = 9", __func__);
 698                         break;*/
 699                 default:
 700                         dbg("cp210x driver does not "
 701                                         "support the number of bits requested,"
 702                                         " using 8 bit mode");
 703                                 bits |= BITS_DATA_8;
 704                                 break;
 705                 }
 706                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 707                         dbg("Number of data bits requested "
 708                                         "not supported by device");
 709         }
 710
 711         if ((cflag     & (PARENB|PARODD|CMSPAR)) !=
 712             (old_cflag & (PARENB|PARODD|CMSPAR))) {
 713                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 714                 bits &= ~BITS_PARITY_MASK;
 715                 if (cflag & PARENB) {
 716                         if (cflag & CMSPAR) {
 717                             if (cflag & PARODD) {
 718                                     bits |= BITS_PARITY_MARK;
 719                                     dbg("%s - parity = MARK", __func__);
 720                             } else {
 721                                     bits |= BITS_PARITY_SPACE;
 722                                     dbg("%s - parity = SPACE", __func__);
 723                             }
 724                         } else {
 725                             if (cflag & PARODD) {
 726                                     bits |= BITS_PARITY_ODD;
 727                                     dbg("%s - parity = ODD", __func__);
 728                             } else {
 729                                     bits |= BITS_PARITY_EVEN;
 730                                     dbg("%s - parity = EVEN", __func__);
 731                             }
 732                         }
 733                 }
 734                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 735                         dbg("Parity mode not supported by device");
 736         }
 737
 738         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 739                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 740                 bits &= ~BITS_STOP_MASK;
 741                 if (cflag & CSTOPB) {
 742                         bits |= BITS_STOP_2;
 743                         dbg("%s - stop bits = 2", __func__);
 744                 } else {
 745                         bits |= BITS_STOP_1;
 746                         dbg("%s - stop bits = 1", __func__);
 747                 }
 748                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 749                         dbg("Number of stop bits requested "
 750                                         "not supported by device");
 751         }
 752
 753         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 754                 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
 755                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 756                                 __func__, modem_ctl[0], modem_ctl[1],
 757                                 modem_ctl[2], modem_ctl[3]);
 758
 759                 if (cflag & CRTSCTS) {
 760                         modem_ctl[0] &= ~0x7B;
 761                         modem_ctl[0] |= 0x09;
 762                         modem_ctl[1] = 0x80;
 763                         dbg("%s - flow control = CRTSCTS", __func__);
 764                 } else {
 765                         modem_ctl[0] &= ~0x7B;
 766                         modem_ctl[0] |= 0x01;
 767                         modem_ctl[1] |= 0x40;
 768                         dbg("%s - flow control = NONE", __func__);
 769                 }
 770
 771                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 772                                 __func__, modem_ctl[0], modem_ctl[1],
 773                                 modem_ctl[2], modem_ctl[3]);
 774                 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16);
 775         }
 776
 777 }
 778
 779 static int cp210x_tiocmset (struct tty_struct *tty,
 780                 unsigned int set, unsigned int clear)
 781 {
 782         struct usb_serial_port *port = tty->driver_data;
 783         return cp210x_tiocmset_port(port, set, clear);
 784 }
 785
 786 static int cp210x_tiocmset_port(struct usb_serial_port *port,
 787                 unsigned int set, unsigned int clear)
 788 {
 789         unsigned int control = 0;
 790
 791         if (set & TIOCM_RTS) {
 792                 control |= CONTROL_RTS;
 793                 control |= CONTROL_WRITE_RTS;
 794         }
 795         if (set & TIOCM_DTR) {
 796                 control |= CONTROL_DTR;
 797                 control |= CONTROL_WRITE_DTR;
 798         }
 799         if (clear & TIOCM_RTS) {
 800                 control &= ~CONTROL_RTS;
 801                 control |= CONTROL_WRITE_RTS;
 802         }
 803         if (clear & TIOCM_DTR) {
 804                 control &= ~CONTROL_DTR;
 805                 control |= CONTROL_WRITE_DTR;
 806         }
 807
 808         dbg("%s - control = 0x%.4x", __func__, control);
 809
 810         return cp210x_set_config(port, CP210X_SET_MHS, &control, 2);
 811 }
 812
 813 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
 814 {
 815         if (on)
 816                 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
 817         else
 818                 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
 819 }
 820
 821 static int cp210x_tiocmget (struct tty_struct *tty)
 822 {
 823         struct usb_serial_port *port = tty->driver_data;
 824         unsigned int control;
 825         int result;
 826
 827         cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1);
 828
 829         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
 830                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
 831                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
 832                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
 833                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
 834                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
 835
 836         dbg("%s - control = 0x%.2x", __func__, control);
 837
 838         return result;
 839 }
 840
 841 static void cp210x_break_ctl (struct tty_struct *tty, int break_state)
 842 {
 843         struct usb_serial_port *port = tty->driver_data;
 844         unsigned int state;
 845
 846         if (break_state == 0)
 847                 state = BREAK_OFF;
 848         else
 849                 state = BREAK_ON;
 850         dbg("%s - turning break %s", __func__,
 851                         state == BREAK_OFF ? "off" : "on");
 852         cp210x_set_config(port, CP210X_SET_BREAK, &state, 2);
 853 }
 854
 855 static int cp210x_startup(struct usb_serial *serial)
 856 {
 857         struct cp210x_port_private *port_priv;
 858         int i;
 859
 860         /* cp210x buffers behave strangely unless device is reset */
 861         usb_reset_device(serial->dev);
 862
 863         for (i = 0; i < serial->num_ports; i++) {
 864                 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
 865                 if (!port_priv)
 866                         return -ENOMEM;
 867
 868                 memset(port_priv, 0x00, sizeof(*port_priv));
 869                 port_priv->bInterfaceNumber =
 870                     serial->interface->cur_altsetting->desc.bInterfaceNumber;
 871
 872                 usb_set_serial_port_data(serial->port[i], port_priv);
 873         }
 874
 875         return 0;
 876 }
 877
 878 static void cp210x_release(struct usb_serial *serial)
 879 {
 880         struct cp210x_port_private *port_priv;
 881         int i;
 882
 883         for (i = 0; i < serial->num_ports; i++) {
 884                 port_priv = usb_get_serial_port_data(serial->port[i]);
 885                 kfree(port_priv);
 886                 usb_set_serial_port_data(serial->port[i], NULL);
 887         }
 888 }
 889
 890 module_usb_serial_driver(serial_drivers, id_table);
 891
 892 MODULE_DESCRIPTION(DRIVER_DESC);
 893 MODULE_VERSION(DRIVER_VERSION);
 894 MODULE_LICENSE("GPL");
 895
 896 module_param(debug, bool, S_IRUGO | S_IWUSR);
 897 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");