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"); 898