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 const struct usb_device_id id_table[] = { 56 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */ 57 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */ 58 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 59 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 60 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */ 61 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */ 62 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */ 63 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */ 64 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */ 65 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */ 66 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */ 67 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */ 68 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */ 69 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */ 70 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */ 71 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */ 72 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */ 73 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */ 74 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */ 75 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */ 76 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */ 77 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */ 78 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */ 79 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */ 80 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */ 81 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */ 82 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */ 83 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */ 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, 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, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */ 103 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */ 104 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */ 105 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */ 106 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */ 107 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */ 108 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */ 109 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */ 110 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */ 111 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */ 112 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */ 113 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */ 114 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */ 115 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ 116 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ 117 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 118 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ 119 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ 120 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ 121 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 122 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 123 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 124 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 125 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 126 { USB_DEVICE(0x10C4, 0xEA80) }, /* Silicon Labs factory default */ 127 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 128 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 129 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 130 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 131 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 132 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 133 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 134 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 135 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 136 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */ 137 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */ 138 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 139 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */ 140 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */ 141 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */ 142 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */ 143 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 144 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ 145 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ 146 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ 147 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ 148 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ 149 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ 150 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 151 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 152 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 153 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 154 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 155 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 156 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 157 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 158 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 159 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 160 { } /* Terminating Entry */ 161 }; 162 163 MODULE_DEVICE_TABLE(usb, id_table); 164 165 struct cp210x_serial_private { 166 __u8 bInterfaceNumber; 167 }; 168 169 static struct usb_serial_driver cp210x_device = { 170 .driver = { 171 .owner = THIS_MODULE, 172 .name = "cp210x", 173 }, 174 .id_table = id_table, 175 .num_ports = 1, 176 .bulk_in_size = 256, 177 .bulk_out_size = 256, 178 .open = cp210x_open, 179 .close = cp210x_close, 180 .break_ctl = cp210x_break_ctl, 181 .set_termios = cp210x_set_termios, 182 .tiocmget = cp210x_tiocmget, 183 .tiocmset = cp210x_tiocmset, 184 .attach = cp210x_startup, 185 .release = cp210x_release, 186 .dtr_rts = cp210x_dtr_rts 187 }; 188 189 static struct usb_serial_driver * const serial_drivers[] = { 190 &cp210x_device, NULL 191 }; 192 193 /* Config request types */ 194 #define REQTYPE_HOST_TO_INTERFACE 0x41 195 #define REQTYPE_INTERFACE_TO_HOST 0xc1 196 #define REQTYPE_HOST_TO_DEVICE 0x40 197 #define REQTYPE_DEVICE_TO_HOST 0xc0 198 199 /* Config request codes */ 200 #define CP210X_IFC_ENABLE 0x00 201 #define CP210X_SET_BAUDDIV 0x01 202 #define CP210X_GET_BAUDDIV 0x02 203 #define CP210X_SET_LINE_CTL 0x03 204 #define CP210X_GET_LINE_CTL 0x04 205 #define CP210X_SET_BREAK 0x05 206 #define CP210X_IMM_CHAR 0x06 207 #define CP210X_SET_MHS 0x07 208 #define CP210X_GET_MDMSTS 0x08 209 #define CP210X_SET_XON 0x09 210 #define CP210X_SET_XOFF 0x0A 211 #define CP210X_SET_EVENTMASK 0x0B 212 #define CP210X_GET_EVENTMASK 0x0C 213 #define CP210X_SET_CHAR 0x0D 214 #define CP210X_GET_CHARS 0x0E 215 #define CP210X_GET_PROPS 0x0F 216 #define CP210X_GET_COMM_STATUS 0x10 217 #define CP210X_RESET 0x11 218 #define CP210X_PURGE 0x12 219 #define CP210X_SET_FLOW 0x13 220 #define CP210X_GET_FLOW 0x14 221 #define CP210X_EMBED_EVENTS 0x15 222 #define CP210X_GET_EVENTSTATE 0x16 223 #define CP210X_SET_CHARS 0x19 224 #define CP210X_GET_BAUDRATE 0x1D 225 #define CP210X_SET_BAUDRATE 0x1E 226 227 /* CP210X_IFC_ENABLE */ 228 #define UART_ENABLE 0x0001 229 #define UART_DISABLE 0x0000 230 231 /* CP210X_(SET|GET)_BAUDDIV */ 232 #define BAUD_RATE_GEN_FREQ 0x384000 233 234 /* CP210X_(SET|GET)_LINE_CTL */ 235 #define BITS_DATA_MASK 0X0f00 236 #define BITS_DATA_5 0X0500 237 #define BITS_DATA_6 0X0600 238 #define BITS_DATA_7 0X0700 239 #define BITS_DATA_8 0X0800 240 #define BITS_DATA_9 0X0900 241 242 #define BITS_PARITY_MASK 0x00f0 243 #define BITS_PARITY_NONE 0x0000 244 #define BITS_PARITY_ODD 0x0010 245 #define BITS_PARITY_EVEN 0x0020 246 #define BITS_PARITY_MARK 0x0030 247 #define BITS_PARITY_SPACE 0x0040 248 249 #define BITS_STOP_MASK 0x000f 250 #define BITS_STOP_1 0x0000 251 #define BITS_STOP_1_5 0x0001 252 #define BITS_STOP_2 0x0002 253 254 /* CP210X_SET_BREAK */ 255 #define BREAK_ON 0x0001 256 #define BREAK_OFF 0x0000 257 258 /* CP210X_(SET_MHS|GET_MDMSTS) */ 259 #define CONTROL_DTR 0x0001 260 #define CONTROL_RTS 0x0002 261 #define CONTROL_CTS 0x0010 262 #define CONTROL_DSR 0x0020 263 #define CONTROL_RING 0x0040 264 #define CONTROL_DCD 0x0080 265 #define CONTROL_WRITE_DTR 0x0100 266 #define CONTROL_WRITE_RTS 0x0200 267 268 /* 269 * cp210x_get_config 270 * Reads from the CP210x configuration registers 271 * 'size' is specified in bytes. 272 * 'data' is a pointer to a pre-allocated array of integers large 273 * enough to hold 'size' bytes (with 4 bytes to each integer) 274 */ 275 static int cp210x_get_config(struct usb_serial_port *port, u8 request, 276 unsigned int *data, int size) 277 { 278 struct usb_serial *serial = port->serial; 279 struct cp210x_serial_private *spriv = usb_get_serial_data(serial); 280 __le32 *buf; 281 int result, i, length; 282 283 /* Number of integers required to contain the array */ 284 length = (((size - 1) | 3) + 1)/4; 285 286 buf = kcalloc(length, sizeof(__le32), GFP_KERNEL); 287 if (!buf) { 288 dev_err(&port->dev, "%s - out of memory.\n", __func__); 289 return -ENOMEM; 290 } 291 292 /* Issue the request, attempting to read 'size' bytes */ 293 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 294 request, REQTYPE_INTERFACE_TO_HOST, 0x0000, 295 spriv->bInterfaceNumber, buf, size, 296 USB_CTRL_GET_TIMEOUT); 297 298 /* Convert data into an array of integers */ 299 for (i = 0; i < length; i++) 300 data[i] = le32_to_cpu(buf[i]); 301 302 kfree(buf); 303 304 if (result != size) { 305 dev_dbg(&port->dev, "%s - Unable to send config request, request=0x%x size=%d result=%d\n", 306 __func__, request, size, result); 307 if (result > 0) 308 result = -EPROTO; 309 310 return result; 311 } 312 313 return 0; 314 } 315 316 /* 317 * cp210x_set_config 318 * Writes to the CP210x configuration registers 319 * Values less than 16 bits wide are sent directly 320 * 'size' is specified in bytes. 321 */ 322 static int cp210x_set_config(struct usb_serial_port *port, u8 request, 323 unsigned int *data, int size) 324 { 325 struct usb_serial *serial = port->serial; 326 struct cp210x_serial_private *spriv = usb_get_serial_data(serial); 327 __le32 *buf; 328 int result, i, length; 329 330 /* Number of integers required to contain the array */ 331 length = (((size - 1) | 3) + 1)/4; 332 333 buf = kmalloc(length * sizeof(__le32), GFP_KERNEL); 334 if (!buf) { 335 dev_err(&port->dev, "%s - out of memory.\n", 336 __func__); 337 return -ENOMEM; 338 } 339 340 /* Array of integers into bytes */ 341 for (i = 0; i < length; i++) 342 buf[i] = cpu_to_le32(data[i]); 343 344 if (size > 2) { 345 result = usb_control_msg(serial->dev, 346 usb_sndctrlpipe(serial->dev, 0), 347 request, REQTYPE_HOST_TO_INTERFACE, 0x0000, 348 spriv->bInterfaceNumber, buf, size, 349 USB_CTRL_SET_TIMEOUT); 350 } else { 351 result = usb_control_msg(serial->dev, 352 usb_sndctrlpipe(serial->dev, 0), 353 request, REQTYPE_HOST_TO_INTERFACE, data[0], 354 spriv->bInterfaceNumber, NULL, 0, 355 USB_CTRL_SET_TIMEOUT); 356 } 357 358 kfree(buf); 359 360 if ((size > 2 && result != size) || result < 0) { 361 dev_dbg(&port->dev, "%s - Unable to send request, request=0x%x size=%d result=%d\n", 362 __func__, request, size, result); 363 if (result > 0) 364 result = -EPROTO; 365 366 return result; 367 } 368 369 return 0; 370 } 371 372 /* 373 * cp210x_set_config_single 374 * Convenience function for calling cp210x_set_config on single data values 375 * without requiring an integer pointer 376 */ 377 static inline int cp210x_set_config_single(struct usb_serial_port *port, 378 u8 request, unsigned int data) 379 { 380 return cp210x_set_config(port, request, &data, 2); 381 } 382 383 /* 384 * cp210x_quantise_baudrate 385 * Quantises the baud rate as per AN205 Table 1 386 */ 387 static unsigned int cp210x_quantise_baudrate(unsigned int baud) { 388 if (baud <= 300) 389 baud = 300; 390 else if (baud <= 600) baud = 600; 391 else if (baud <= 1200) baud = 1200; 392 else if (baud <= 1800) baud = 1800; 393 else if (baud <= 2400) baud = 2400; 394 else if (baud <= 4000) baud = 4000; 395 else if (baud <= 4803) baud = 4800; 396 else if (baud <= 7207) baud = 7200; 397 else if (baud <= 9612) baud = 9600; 398 else if (baud <= 14428) baud = 14400; 399 else if (baud <= 16062) baud = 16000; 400 else if (baud <= 19250) baud = 19200; 401 else if (baud <= 28912) baud = 28800; 402 else if (baud <= 38601) baud = 38400; 403 else if (baud <= 51558) baud = 51200; 404 else if (baud <= 56280) baud = 56000; 405 else if (baud <= 58053) baud = 57600; 406 else if (baud <= 64111) baud = 64000; 407 else if (baud <= 77608) baud = 76800; 408 else if (baud <= 117028) baud = 115200; 409 else if (baud <= 129347) baud = 128000; 410 else if (baud <= 156868) baud = 153600; 411 else if (baud <= 237832) baud = 230400; 412 else if (baud <= 254234) baud = 250000; 413 else if (baud <= 273066) baud = 256000; 414 else if (baud <= 491520) baud = 460800; 415 else if (baud <= 567138) baud = 500000; 416 else if (baud <= 670254) baud = 576000; 417 else if (baud < 1000000) 418 baud = 921600; 419 else if (baud > 2000000) 420 baud = 2000000; 421 return baud; 422 } 423 424 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 425 { 426 int result; 427 428 result = cp210x_set_config_single(port, CP210X_IFC_ENABLE, 429 UART_ENABLE); 430 if (result) { 431 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 432 return result; 433 } 434 435 /* Configure the termios structure */ 436 cp210x_get_termios(tty, port); 437 438 /* The baud rate must be initialised on cp2104 */ 439 if (tty) 440 cp210x_change_speed(tty, port, NULL); 441 442 return usb_serial_generic_open(tty, port); 443 } 444 445 static void cp210x_close(struct usb_serial_port *port) 446 { 447 usb_serial_generic_close(port); 448 449 mutex_lock(&port->serial->disc_mutex); 450 if (!port->serial->disconnected) 451 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE); 452 mutex_unlock(&port->serial->disc_mutex); 453 } 454 455 /* 456 * cp210x_get_termios 457 * Reads the baud rate, data bits, parity, stop bits and flow control mode 458 * from the device, corrects any unsupported values, and configures the 459 * termios structure to reflect the state of the device 460 */ 461 static void cp210x_get_termios(struct tty_struct *tty, 462 struct usb_serial_port *port) 463 { 464 unsigned int baud; 465 466 if (tty) { 467 cp210x_get_termios_port(tty->driver_data, 468 &tty->termios.c_cflag, &baud); 469 tty_encode_baud_rate(tty, baud, baud); 470 } 471 472 else { 473 unsigned int cflag; 474 cflag = 0; 475 cp210x_get_termios_port(port, &cflag, &baud); 476 } 477 } 478 479 /* 480 * cp210x_get_termios_port 481 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port. 482 */ 483 static void cp210x_get_termios_port(struct usb_serial_port *port, 484 unsigned int *cflagp, unsigned int *baudp) 485 { 486 struct device *dev = &port->dev; 487 unsigned int cflag, modem_ctl[4]; 488 unsigned int baud; 489 unsigned int bits; 490 491 cp210x_get_config(port, CP210X_GET_BAUDRATE, &baud, 4); 492 493 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud); 494 *baudp = baud; 495 496 cflag = *cflagp; 497 498 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 499 cflag &= ~CSIZE; 500 switch (bits & BITS_DATA_MASK) { 501 case BITS_DATA_5: 502 dev_dbg(dev, "%s - data bits = 5\n", __func__); 503 cflag |= CS5; 504 break; 505 case BITS_DATA_6: 506 dev_dbg(dev, "%s - data bits = 6\n", __func__); 507 cflag |= CS6; 508 break; 509 case BITS_DATA_7: 510 dev_dbg(dev, "%s - data bits = 7\n", __func__); 511 cflag |= CS7; 512 break; 513 case BITS_DATA_8: 514 dev_dbg(dev, "%s - data bits = 8\n", __func__); 515 cflag |= CS8; 516 break; 517 case BITS_DATA_9: 518 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__); 519 cflag |= CS8; 520 bits &= ~BITS_DATA_MASK; 521 bits |= BITS_DATA_8; 522 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 523 break; 524 default: 525 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__); 526 cflag |= CS8; 527 bits &= ~BITS_DATA_MASK; 528 bits |= BITS_DATA_8; 529 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 530 break; 531 } 532 533 switch (bits & BITS_PARITY_MASK) { 534 case BITS_PARITY_NONE: 535 dev_dbg(dev, "%s - parity = NONE\n", __func__); 536 cflag &= ~PARENB; 537 break; 538 case BITS_PARITY_ODD: 539 dev_dbg(dev, "%s - parity = ODD\n", __func__); 540 cflag |= (PARENB|PARODD); 541 break; 542 case BITS_PARITY_EVEN: 543 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 544 cflag &= ~PARODD; 545 cflag |= PARENB; 546 break; 547 case BITS_PARITY_MARK: 548 dev_dbg(dev, "%s - parity = MARK\n", __func__); 549 cflag |= (PARENB|PARODD|CMSPAR); 550 break; 551 case BITS_PARITY_SPACE: 552 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 553 cflag &= ~PARODD; 554 cflag |= (PARENB|CMSPAR); 555 break; 556 default: 557 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__); 558 cflag &= ~PARENB; 559 bits &= ~BITS_PARITY_MASK; 560 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 561 break; 562 } 563 564 cflag &= ~CSTOPB; 565 switch (bits & BITS_STOP_MASK) { 566 case BITS_STOP_1: 567 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 568 break; 569 case BITS_STOP_1_5: 570 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__); 571 bits &= ~BITS_STOP_MASK; 572 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 573 break; 574 case BITS_STOP_2: 575 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 576 cflag |= CSTOPB; 577 break; 578 default: 579 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__); 580 bits &= ~BITS_STOP_MASK; 581 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 582 break; 583 } 584 585 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16); 586 if (modem_ctl[0] & 0x0008) { 587 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 588 cflag |= CRTSCTS; 589 } else { 590 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 591 cflag &= ~CRTSCTS; 592 } 593 594 *cflagp = cflag; 595 } 596 597 /* 598 * CP2101 supports the following baud rates: 599 * 600 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 601 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 602 * 603 * CP2102 and CP2103 support the following additional rates: 604 * 605 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 606 * 576000 607 * 608 * The device will map a requested rate to a supported one, but the result 609 * of requests for rates greater than 1053257 is undefined (see AN205). 610 * 611 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 612 * respectively, with an error less than 1%. The actual rates are determined 613 * by 614 * 615 * div = round(freq / (2 x prescale x request)) 616 * actual = freq / (2 x prescale x div) 617 * 618 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 619 * or 1 otherwise. 620 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 621 * otherwise. 622 */ 623 static void cp210x_change_speed(struct tty_struct *tty, 624 struct usb_serial_port *port, struct ktermios *old_termios) 625 { 626 u32 baud; 627 628 baud = tty->termios.c_ospeed; 629 630 /* This maps the requested rate to a rate valid on cp2102 or cp2103, 631 * or to an arbitrary rate in [1M,2M]. 632 * 633 * NOTE: B0 is not implemented. 634 */ 635 baud = cp210x_quantise_baudrate(baud); 636 637 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 638 if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud, 639 sizeof(baud))) { 640 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 641 if (old_termios) 642 baud = old_termios->c_ospeed; 643 else 644 baud = 9600; 645 } 646 647 tty_encode_baud_rate(tty, baud, baud); 648 } 649 650 static void cp210x_set_termios(struct tty_struct *tty, 651 struct usb_serial_port *port, struct ktermios *old_termios) 652 { 653 struct device *dev = &port->dev; 654 unsigned int cflag, old_cflag; 655 unsigned int bits; 656 unsigned int modem_ctl[4]; 657 658 dev_dbg(dev, "%s - port %d\n", __func__, port->number); 659 660 if (!tty) 661 return; 662 663 cflag = tty->termios.c_cflag; 664 old_cflag = old_termios->c_cflag; 665 666 if (tty->termios.c_ospeed != old_termios->c_ospeed) 667 cp210x_change_speed(tty, port, old_termios); 668 669 /* If the number of data bits is to be updated */ 670 if ((cflag & CSIZE) != (old_cflag & CSIZE)) { 671 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 672 bits &= ~BITS_DATA_MASK; 673 switch (cflag & CSIZE) { 674 case CS5: 675 bits |= BITS_DATA_5; 676 dev_dbg(dev, "%s - data bits = 5\n", __func__); 677 break; 678 case CS6: 679 bits |= BITS_DATA_6; 680 dev_dbg(dev, "%s - data bits = 6\n", __func__); 681 break; 682 case CS7: 683 bits |= BITS_DATA_7; 684 dev_dbg(dev, "%s - data bits = 7\n", __func__); 685 break; 686 case CS8: 687 bits |= BITS_DATA_8; 688 dev_dbg(dev, "%s - data bits = 8\n", __func__); 689 break; 690 /*case CS9: 691 bits |= BITS_DATA_9; 692 dev_dbg(dev, "%s - data bits = 9\n", __func__); 693 break;*/ 694 default: 695 dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n"); 696 bits |= BITS_DATA_8; 697 break; 698 } 699 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 700 dev_dbg(dev, "Number of data bits requested not supported by device\n"); 701 } 702 703 if ((cflag & (PARENB|PARODD|CMSPAR)) != 704 (old_cflag & (PARENB|PARODD|CMSPAR))) { 705 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 706 bits &= ~BITS_PARITY_MASK; 707 if (cflag & PARENB) { 708 if (cflag & CMSPAR) { 709 if (cflag & PARODD) { 710 bits |= BITS_PARITY_MARK; 711 dev_dbg(dev, "%s - parity = MARK\n", __func__); 712 } else { 713 bits |= BITS_PARITY_SPACE; 714 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 715 } 716 } else { 717 if (cflag & PARODD) { 718 bits |= BITS_PARITY_ODD; 719 dev_dbg(dev, "%s - parity = ODD\n", __func__); 720 } else { 721 bits |= BITS_PARITY_EVEN; 722 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 723 } 724 } 725 } 726 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 727 dev_dbg(dev, "Parity mode not supported by device\n"); 728 } 729 730 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { 731 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 732 bits &= ~BITS_STOP_MASK; 733 if (cflag & CSTOPB) { 734 bits |= BITS_STOP_2; 735 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 736 } else { 737 bits |= BITS_STOP_1; 738 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 739 } 740 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 741 dev_dbg(dev, "Number of stop bits requested not supported by device\n"); 742 } 743 744 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 745 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16); 746 dev_dbg(dev, "%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n", 747 __func__, modem_ctl[0], modem_ctl[1], 748 modem_ctl[2], modem_ctl[3]); 749 750 if (cflag & CRTSCTS) { 751 modem_ctl[0] &= ~0x7B; 752 modem_ctl[0] |= 0x09; 753 modem_ctl[1] = 0x80; 754 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 755 } else { 756 modem_ctl[0] &= ~0x7B; 757 modem_ctl[0] |= 0x01; 758 modem_ctl[1] |= 0x40; 759 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 760 } 761 762 dev_dbg(dev, "%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n", 763 __func__, modem_ctl[0], modem_ctl[1], 764 modem_ctl[2], modem_ctl[3]); 765 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16); 766 } 767 768 } 769 770 static int cp210x_tiocmset (struct tty_struct *tty, 771 unsigned int set, unsigned int clear) 772 { 773 struct usb_serial_port *port = tty->driver_data; 774 return cp210x_tiocmset_port(port, set, clear); 775 } 776 777 static int cp210x_tiocmset_port(struct usb_serial_port *port, 778 unsigned int set, unsigned int clear) 779 { 780 unsigned int control = 0; 781 782 if (set & TIOCM_RTS) { 783 control |= CONTROL_RTS; 784 control |= CONTROL_WRITE_RTS; 785 } 786 if (set & TIOCM_DTR) { 787 control |= CONTROL_DTR; 788 control |= CONTROL_WRITE_DTR; 789 } 790 if (clear & TIOCM_RTS) { 791 control &= ~CONTROL_RTS; 792 control |= CONTROL_WRITE_RTS; 793 } 794 if (clear & TIOCM_DTR) { 795 control &= ~CONTROL_DTR; 796 control |= CONTROL_WRITE_DTR; 797 } 798 799 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control); 800 801 return cp210x_set_config(port, CP210X_SET_MHS, &control, 2); 802 } 803 804 static void cp210x_dtr_rts(struct usb_serial_port *p, int on) 805 { 806 if (on) 807 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0); 808 else 809 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS); 810 } 811 812 static int cp210x_tiocmget (struct tty_struct *tty) 813 { 814 struct usb_serial_port *port = tty->driver_data; 815 unsigned int control; 816 int result; 817 818 cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1); 819 820 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 821 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 822 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 823 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 824 |((control & CONTROL_RING)? TIOCM_RI : 0) 825 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 826 827 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control); 828 829 return result; 830 } 831 832 static void cp210x_break_ctl (struct tty_struct *tty, int break_state) 833 { 834 struct usb_serial_port *port = tty->driver_data; 835 unsigned int state; 836 837 if (break_state == 0) 838 state = BREAK_OFF; 839 else 840 state = BREAK_ON; 841 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 842 state == BREAK_OFF ? "off" : "on"); 843 cp210x_set_config(port, CP210X_SET_BREAK, &state, 2); 844 } 845 846 static int cp210x_startup(struct usb_serial *serial) 847 { 848 struct usb_host_interface *cur_altsetting; 849 struct cp210x_serial_private *spriv; 850 851 /* cp210x buffers behave strangely unless device is reset */ 852 usb_reset_device(serial->dev); 853 854 spriv = kzalloc(sizeof(*spriv), GFP_KERNEL); 855 if (!spriv) 856 return -ENOMEM; 857 858 cur_altsetting = serial->interface->cur_altsetting; 859 spriv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber; 860 861 usb_set_serial_data(serial, spriv); 862 863 return 0; 864 } 865 866 static void cp210x_release(struct usb_serial *serial) 867 { 868 struct cp210x_serial_private *spriv; 869 870 spriv = usb_get_serial_data(serial); 871 kfree(spriv); 872 } 873 874 module_usb_serial_driver(serial_drivers, id_table); 875 876 MODULE_DESCRIPTION(DRIVER_DESC); 877 MODULE_VERSION(DRIVER_VERSION); 878 MODULE_LICENSE("GPL"); 879