1 /* 2 * Silicon Laboratories CP210x USB to RS232 serial adaptor driver 3 * 4 * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License version 8 * 2 as published by the Free Software Foundation. 9 * 10 * Support to set flow control line levels using TIOCMGET and TIOCMSET 11 * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow 12 * control thanks to Munir Nassar nassarmu@real-time.com 13 * 14 */ 15 16 #include <linux/kernel.h> 17 #include <linux/errno.h> 18 #include <linux/slab.h> 19 #include <linux/tty.h> 20 #include <linux/tty_flip.h> 21 #include <linux/module.h> 22 #include <linux/moduleparam.h> 23 #include <linux/usb.h> 24 #include <linux/uaccess.h> 25 #include <linux/usb/serial.h> 26 27 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver" 28 29 /* 30 * Function Prototypes 31 */ 32 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *); 33 static void cp210x_close(struct usb_serial_port *); 34 static void cp210x_get_termios(struct tty_struct *, struct usb_serial_port *); 35 static void cp210x_get_termios_port(struct usb_serial_port *port, 36 unsigned int *cflagp, unsigned int *baudp); 37 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *, 38 struct ktermios *); 39 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *, 40 struct ktermios*); 41 static int cp210x_tiocmget(struct tty_struct *); 42 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int); 43 static int cp210x_tiocmset_port(struct usb_serial_port *port, 44 unsigned int, unsigned int); 45 static void cp210x_break_ctl(struct tty_struct *, int); 46 static int cp210x_startup(struct usb_serial *); 47 static void cp210x_release(struct usb_serial *); 48 static void cp210x_dtr_rts(struct usb_serial_port *p, int on); 49 50 static const struct usb_device_id id_table[] = { 51 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */ 52 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */ 53 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 54 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 55 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */ 56 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */ 57 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */ 58 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */ 59 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */ 60 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */ 61 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */ 62 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */ 63 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */ 64 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */ 65 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */ 66 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */ 67 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */ 68 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */ 69 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */ 70 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */ 71 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */ 72 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */ 73 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */ 74 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */ 75 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */ 76 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */ 77 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */ 78 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */ 79 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */ 80 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */ 81 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */ 82 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */ 83 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */ 84 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */ 85 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */ 86 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */ 87 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */ 88 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */ 89 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */ 90 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */ 91 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */ 92 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */ 93 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */ 94 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */ 95 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */ 96 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */ 97 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */ 98 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */ 99 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */ 100 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */ 101 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */ 102 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */ 103 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */ 104 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */ 105 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */ 106 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */ 107 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */ 108 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */ 109 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */ 110 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */ 111 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ 112 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ 113 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 114 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ 115 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ 116 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ 117 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */ 118 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 119 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 120 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 121 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 122 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 123 { USB_DEVICE(0x10C4, 0xEA80) }, /* Silicon Labs factory default */ 124 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 125 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 126 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 127 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 128 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 129 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 130 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 131 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 132 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 133 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */ 134 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */ 135 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 136 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */ 137 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */ 138 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */ 139 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */ 140 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 141 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ 142 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ 143 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ 144 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ 145 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ 146 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ 147 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 148 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 149 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 150 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 151 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 152 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 153 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 154 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 155 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 156 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 157 { } /* Terminating Entry */ 158 }; 159 160 MODULE_DEVICE_TABLE(usb, id_table); 161 162 struct cp210x_serial_private { 163 __u8 bInterfaceNumber; 164 }; 165 166 static struct usb_serial_driver cp210x_device = { 167 .driver = { 168 .owner = THIS_MODULE, 169 .name = "cp210x", 170 }, 171 .id_table = id_table, 172 .num_ports = 1, 173 .bulk_in_size = 256, 174 .bulk_out_size = 256, 175 .open = cp210x_open, 176 .close = cp210x_close, 177 .break_ctl = cp210x_break_ctl, 178 .set_termios = cp210x_set_termios, 179 .tiocmget = cp210x_tiocmget, 180 .tiocmset = cp210x_tiocmset, 181 .attach = cp210x_startup, 182 .release = cp210x_release, 183 .dtr_rts = cp210x_dtr_rts 184 }; 185 186 static struct usb_serial_driver * const serial_drivers[] = { 187 &cp210x_device, NULL 188 }; 189 190 /* Config request types */ 191 #define REQTYPE_HOST_TO_INTERFACE 0x41 192 #define REQTYPE_INTERFACE_TO_HOST 0xc1 193 #define REQTYPE_HOST_TO_DEVICE 0x40 194 #define REQTYPE_DEVICE_TO_HOST 0xc0 195 196 /* Config request codes */ 197 #define CP210X_IFC_ENABLE 0x00 198 #define CP210X_SET_BAUDDIV 0x01 199 #define CP210X_GET_BAUDDIV 0x02 200 #define CP210X_SET_LINE_CTL 0x03 201 #define CP210X_GET_LINE_CTL 0x04 202 #define CP210X_SET_BREAK 0x05 203 #define CP210X_IMM_CHAR 0x06 204 #define CP210X_SET_MHS 0x07 205 #define CP210X_GET_MDMSTS 0x08 206 #define CP210X_SET_XON 0x09 207 #define CP210X_SET_XOFF 0x0A 208 #define CP210X_SET_EVENTMASK 0x0B 209 #define CP210X_GET_EVENTMASK 0x0C 210 #define CP210X_SET_CHAR 0x0D 211 #define CP210X_GET_CHARS 0x0E 212 #define CP210X_GET_PROPS 0x0F 213 #define CP210X_GET_COMM_STATUS 0x10 214 #define CP210X_RESET 0x11 215 #define CP210X_PURGE 0x12 216 #define CP210X_SET_FLOW 0x13 217 #define CP210X_GET_FLOW 0x14 218 #define CP210X_EMBED_EVENTS 0x15 219 #define CP210X_GET_EVENTSTATE 0x16 220 #define CP210X_SET_CHARS 0x19 221 #define CP210X_GET_BAUDRATE 0x1D 222 #define CP210X_SET_BAUDRATE 0x1E 223 224 /* CP210X_IFC_ENABLE */ 225 #define UART_ENABLE 0x0001 226 #define UART_DISABLE 0x0000 227 228 /* CP210X_(SET|GET)_BAUDDIV */ 229 #define BAUD_RATE_GEN_FREQ 0x384000 230 231 /* CP210X_(SET|GET)_LINE_CTL */ 232 #define BITS_DATA_MASK 0X0f00 233 #define BITS_DATA_5 0X0500 234 #define BITS_DATA_6 0X0600 235 #define BITS_DATA_7 0X0700 236 #define BITS_DATA_8 0X0800 237 #define BITS_DATA_9 0X0900 238 239 #define BITS_PARITY_MASK 0x00f0 240 #define BITS_PARITY_NONE 0x0000 241 #define BITS_PARITY_ODD 0x0010 242 #define BITS_PARITY_EVEN 0x0020 243 #define BITS_PARITY_MARK 0x0030 244 #define BITS_PARITY_SPACE 0x0040 245 246 #define BITS_STOP_MASK 0x000f 247 #define BITS_STOP_1 0x0000 248 #define BITS_STOP_1_5 0x0001 249 #define BITS_STOP_2 0x0002 250 251 /* CP210X_SET_BREAK */ 252 #define BREAK_ON 0x0001 253 #define BREAK_OFF 0x0000 254 255 /* CP210X_(SET_MHS|GET_MDMSTS) */ 256 #define CONTROL_DTR 0x0001 257 #define CONTROL_RTS 0x0002 258 #define CONTROL_CTS 0x0010 259 #define CONTROL_DSR 0x0020 260 #define CONTROL_RING 0x0040 261 #define CONTROL_DCD 0x0080 262 #define CONTROL_WRITE_DTR 0x0100 263 #define CONTROL_WRITE_RTS 0x0200 264 265 /* 266 * cp210x_get_config 267 * Reads from the CP210x configuration registers 268 * 'size' is specified in bytes. 269 * 'data' is a pointer to a pre-allocated array of integers large 270 * enough to hold 'size' bytes (with 4 bytes to each integer) 271 */ 272 static int cp210x_get_config(struct usb_serial_port *port, u8 request, 273 unsigned int *data, int size) 274 { 275 struct usb_serial *serial = port->serial; 276 struct cp210x_serial_private *spriv = usb_get_serial_data(serial); 277 __le32 *buf; 278 int result, i, length; 279 280 /* Number of integers required to contain the array */ 281 length = (((size - 1) | 3) + 1) / 4; 282 283 buf = kcalloc(length, sizeof(__le32), GFP_KERNEL); 284 if (!buf) { 285 dev_err(&port->dev, "%s - out of memory.\n", __func__); 286 return -ENOMEM; 287 } 288 289 /* Issue the request, attempting to read 'size' bytes */ 290 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 291 request, REQTYPE_INTERFACE_TO_HOST, 0x0000, 292 spriv->bInterfaceNumber, buf, size, 293 USB_CTRL_GET_TIMEOUT); 294 295 /* Convert data into an array of integers */ 296 for (i = 0; i < length; i++) 297 data[i] = le32_to_cpu(buf[i]); 298 299 kfree(buf); 300 301 if (result != size) { 302 dev_dbg(&port->dev, "%s - Unable to send config request, request=0x%x size=%d result=%d\n", 303 __func__, request, size, result); 304 if (result > 0) 305 result = -EPROTO; 306 307 return result; 308 } 309 310 return 0; 311 } 312 313 /* 314 * cp210x_set_config 315 * Writes to the CP210x configuration registers 316 * Values less than 16 bits wide are sent directly 317 * 'size' is specified in bytes. 318 */ 319 static int cp210x_set_config(struct usb_serial_port *port, u8 request, 320 unsigned int *data, int size) 321 { 322 struct usb_serial *serial = port->serial; 323 struct cp210x_serial_private *spriv = usb_get_serial_data(serial); 324 __le32 *buf; 325 int result, i, length; 326 327 /* Number of integers required to contain the array */ 328 length = (((size - 1) | 3) + 1) / 4; 329 330 buf = kmalloc(length * sizeof(__le32), GFP_KERNEL); 331 if (!buf) { 332 dev_err(&port->dev, "%s - out of memory.\n", __func__); 333 return -ENOMEM; 334 } 335 336 /* Array of integers into bytes */ 337 for (i = 0; i < length; i++) 338 buf[i] = cpu_to_le32(data[i]); 339 340 if (size > 2) { 341 result = usb_control_msg(serial->dev, 342 usb_sndctrlpipe(serial->dev, 0), 343 request, REQTYPE_HOST_TO_INTERFACE, 0x0000, 344 spriv->bInterfaceNumber, buf, size, 345 USB_CTRL_SET_TIMEOUT); 346 } else { 347 result = usb_control_msg(serial->dev, 348 usb_sndctrlpipe(serial->dev, 0), 349 request, REQTYPE_HOST_TO_INTERFACE, data[0], 350 spriv->bInterfaceNumber, NULL, 0, 351 USB_CTRL_SET_TIMEOUT); 352 } 353 354 kfree(buf); 355 356 if ((size > 2 && result != size) || result < 0) { 357 dev_dbg(&port->dev, "%s - Unable to send request, request=0x%x size=%d result=%d\n", 358 __func__, request, size, result); 359 if (result > 0) 360 result = -EPROTO; 361 362 return result; 363 } 364 365 return 0; 366 } 367 368 /* 369 * cp210x_set_config_single 370 * Convenience function for calling cp210x_set_config on single data values 371 * without requiring an integer pointer 372 */ 373 static inline int cp210x_set_config_single(struct usb_serial_port *port, 374 u8 request, unsigned int data) 375 { 376 return cp210x_set_config(port, request, &data, 2); 377 } 378 379 /* 380 * cp210x_quantise_baudrate 381 * Quantises the baud rate as per AN205 Table 1 382 */ 383 static unsigned int cp210x_quantise_baudrate(unsigned int baud) 384 { 385 if (baud <= 300) 386 baud = 300; 387 else if (baud <= 600) baud = 600; 388 else if (baud <= 1200) baud = 1200; 389 else if (baud <= 1800) baud = 1800; 390 else if (baud <= 2400) baud = 2400; 391 else if (baud <= 4000) baud = 4000; 392 else if (baud <= 4803) baud = 4800; 393 else if (baud <= 7207) baud = 7200; 394 else if (baud <= 9612) baud = 9600; 395 else if (baud <= 14428) baud = 14400; 396 else if (baud <= 16062) baud = 16000; 397 else if (baud <= 19250) baud = 19200; 398 else if (baud <= 28912) baud = 28800; 399 else if (baud <= 38601) baud = 38400; 400 else if (baud <= 51558) baud = 51200; 401 else if (baud <= 56280) baud = 56000; 402 else if (baud <= 58053) baud = 57600; 403 else if (baud <= 64111) baud = 64000; 404 else if (baud <= 77608) baud = 76800; 405 else if (baud <= 117028) baud = 115200; 406 else if (baud <= 129347) baud = 128000; 407 else if (baud <= 156868) baud = 153600; 408 else if (baud <= 237832) baud = 230400; 409 else if (baud <= 254234) baud = 250000; 410 else if (baud <= 273066) baud = 256000; 411 else if (baud <= 491520) baud = 460800; 412 else if (baud <= 567138) baud = 500000; 413 else if (baud <= 670254) baud = 576000; 414 else if (baud < 1000000) 415 baud = 921600; 416 else if (baud > 2000000) 417 baud = 2000000; 418 return baud; 419 } 420 421 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 422 { 423 int result; 424 425 result = cp210x_set_config_single(port, CP210X_IFC_ENABLE, 426 UART_ENABLE); 427 if (result) { 428 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 429 return result; 430 } 431 432 /* Configure the termios structure */ 433 cp210x_get_termios(tty, port); 434 435 /* The baud rate must be initialised on cp2104 */ 436 if (tty) 437 cp210x_change_speed(tty, port, NULL); 438 439 return usb_serial_generic_open(tty, port); 440 } 441 442 static void cp210x_close(struct usb_serial_port *port) 443 { 444 usb_serial_generic_close(port); 445 446 mutex_lock(&port->serial->disc_mutex); 447 if (!port->serial->disconnected) 448 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE); 449 mutex_unlock(&port->serial->disc_mutex); 450 } 451 452 /* 453 * cp210x_get_termios 454 * Reads the baud rate, data bits, parity, stop bits and flow control mode 455 * from the device, corrects any unsupported values, and configures the 456 * termios structure to reflect the state of the device 457 */ 458 static void cp210x_get_termios(struct tty_struct *tty, 459 struct usb_serial_port *port) 460 { 461 unsigned int baud; 462 463 if (tty) { 464 cp210x_get_termios_port(tty->driver_data, 465 &tty->termios.c_cflag, &baud); 466 tty_encode_baud_rate(tty, baud, baud); 467 } else { 468 unsigned int cflag; 469 cflag = 0; 470 cp210x_get_termios_port(port, &cflag, &baud); 471 } 472 } 473 474 /* 475 * cp210x_get_termios_port 476 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port. 477 */ 478 static void cp210x_get_termios_port(struct usb_serial_port *port, 479 unsigned int *cflagp, unsigned int *baudp) 480 { 481 struct device *dev = &port->dev; 482 unsigned int cflag, modem_ctl[4]; 483 unsigned int baud; 484 unsigned int bits; 485 486 cp210x_get_config(port, CP210X_GET_BAUDRATE, &baud, 4); 487 488 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud); 489 *baudp = baud; 490 491 cflag = *cflagp; 492 493 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 494 cflag &= ~CSIZE; 495 switch (bits & BITS_DATA_MASK) { 496 case BITS_DATA_5: 497 dev_dbg(dev, "%s - data bits = 5\n", __func__); 498 cflag |= CS5; 499 break; 500 case BITS_DATA_6: 501 dev_dbg(dev, "%s - data bits = 6\n", __func__); 502 cflag |= CS6; 503 break; 504 case BITS_DATA_7: 505 dev_dbg(dev, "%s - data bits = 7\n", __func__); 506 cflag |= CS7; 507 break; 508 case BITS_DATA_8: 509 dev_dbg(dev, "%s - data bits = 8\n", __func__); 510 cflag |= CS8; 511 break; 512 case BITS_DATA_9: 513 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__); 514 cflag |= CS8; 515 bits &= ~BITS_DATA_MASK; 516 bits |= BITS_DATA_8; 517 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 518 break; 519 default: 520 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__); 521 cflag |= CS8; 522 bits &= ~BITS_DATA_MASK; 523 bits |= BITS_DATA_8; 524 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 525 break; 526 } 527 528 switch (bits & BITS_PARITY_MASK) { 529 case BITS_PARITY_NONE: 530 dev_dbg(dev, "%s - parity = NONE\n", __func__); 531 cflag &= ~PARENB; 532 break; 533 case BITS_PARITY_ODD: 534 dev_dbg(dev, "%s - parity = ODD\n", __func__); 535 cflag |= (PARENB|PARODD); 536 break; 537 case BITS_PARITY_EVEN: 538 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 539 cflag &= ~PARODD; 540 cflag |= PARENB; 541 break; 542 case BITS_PARITY_MARK: 543 dev_dbg(dev, "%s - parity = MARK\n", __func__); 544 cflag |= (PARENB|PARODD|CMSPAR); 545 break; 546 case BITS_PARITY_SPACE: 547 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 548 cflag &= ~PARODD; 549 cflag |= (PARENB|CMSPAR); 550 break; 551 default: 552 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__); 553 cflag &= ~PARENB; 554 bits &= ~BITS_PARITY_MASK; 555 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 556 break; 557 } 558 559 cflag &= ~CSTOPB; 560 switch (bits & BITS_STOP_MASK) { 561 case BITS_STOP_1: 562 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 563 break; 564 case BITS_STOP_1_5: 565 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__); 566 bits &= ~BITS_STOP_MASK; 567 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 568 break; 569 case BITS_STOP_2: 570 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 571 cflag |= CSTOPB; 572 break; 573 default: 574 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__); 575 bits &= ~BITS_STOP_MASK; 576 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 577 break; 578 } 579 580 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16); 581 if (modem_ctl[0] & 0x0008) { 582 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 583 cflag |= CRTSCTS; 584 } else { 585 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 586 cflag &= ~CRTSCTS; 587 } 588 589 *cflagp = cflag; 590 } 591 592 /* 593 * CP2101 supports the following baud rates: 594 * 595 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 596 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 597 * 598 * CP2102 and CP2103 support the following additional rates: 599 * 600 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 601 * 576000 602 * 603 * The device will map a requested rate to a supported one, but the result 604 * of requests for rates greater than 1053257 is undefined (see AN205). 605 * 606 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 607 * respectively, with an error less than 1%. The actual rates are determined 608 * by 609 * 610 * div = round(freq / (2 x prescale x request)) 611 * actual = freq / (2 x prescale x div) 612 * 613 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 614 * or 1 otherwise. 615 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 616 * otherwise. 617 */ 618 static void cp210x_change_speed(struct tty_struct *tty, 619 struct usb_serial_port *port, struct ktermios *old_termios) 620 { 621 u32 baud; 622 623 baud = tty->termios.c_ospeed; 624 625 /* This maps the requested rate to a rate valid on cp2102 or cp2103, 626 * or to an arbitrary rate in [1M,2M]. 627 * 628 * NOTE: B0 is not implemented. 629 */ 630 baud = cp210x_quantise_baudrate(baud); 631 632 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 633 if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud, 634 sizeof(baud))) { 635 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 636 if (old_termios) 637 baud = old_termios->c_ospeed; 638 else 639 baud = 9600; 640 } 641 642 tty_encode_baud_rate(tty, baud, baud); 643 } 644 645 static void cp210x_set_termios(struct tty_struct *tty, 646 struct usb_serial_port *port, struct ktermios *old_termios) 647 { 648 struct device *dev = &port->dev; 649 unsigned int cflag, old_cflag; 650 unsigned int bits; 651 unsigned int modem_ctl[4]; 652 653 dev_dbg(dev, "%s - port %d\n", __func__, port->number); 654 655 if (!tty) 656 return; 657 658 cflag = tty->termios.c_cflag; 659 old_cflag = old_termios->c_cflag; 660 661 if (tty->termios.c_ospeed != old_termios->c_ospeed) 662 cp210x_change_speed(tty, port, old_termios); 663 664 /* If the number of data bits is to be updated */ 665 if ((cflag & CSIZE) != (old_cflag & CSIZE)) { 666 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 667 bits &= ~BITS_DATA_MASK; 668 switch (cflag & CSIZE) { 669 case CS5: 670 bits |= BITS_DATA_5; 671 dev_dbg(dev, "%s - data bits = 5\n", __func__); 672 break; 673 case CS6: 674 bits |= BITS_DATA_6; 675 dev_dbg(dev, "%s - data bits = 6\n", __func__); 676 break; 677 case CS7: 678 bits |= BITS_DATA_7; 679 dev_dbg(dev, "%s - data bits = 7\n", __func__); 680 break; 681 case CS8: 682 bits |= BITS_DATA_8; 683 dev_dbg(dev, "%s - data bits = 8\n", __func__); 684 break; 685 /*case CS9: 686 bits |= BITS_DATA_9; 687 dev_dbg(dev, "%s - data bits = 9\n", __func__); 688 break;*/ 689 default: 690 dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n"); 691 bits |= BITS_DATA_8; 692 break; 693 } 694 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 695 dev_dbg(dev, "Number of data bits requested not supported by device\n"); 696 } 697 698 if ((cflag & (PARENB|PARODD|CMSPAR)) != 699 (old_cflag & (PARENB|PARODD|CMSPAR))) { 700 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 701 bits &= ~BITS_PARITY_MASK; 702 if (cflag & PARENB) { 703 if (cflag & CMSPAR) { 704 if (cflag & PARODD) { 705 bits |= BITS_PARITY_MARK; 706 dev_dbg(dev, "%s - parity = MARK\n", __func__); 707 } else { 708 bits |= BITS_PARITY_SPACE; 709 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 710 } 711 } else { 712 if (cflag & PARODD) { 713 bits |= BITS_PARITY_ODD; 714 dev_dbg(dev, "%s - parity = ODD\n", __func__); 715 } else { 716 bits |= BITS_PARITY_EVEN; 717 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 718 } 719 } 720 } 721 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 722 dev_dbg(dev, "Parity mode not supported by device\n"); 723 } 724 725 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { 726 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 727 bits &= ~BITS_STOP_MASK; 728 if (cflag & CSTOPB) { 729 bits |= BITS_STOP_2; 730 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 731 } else { 732 bits |= BITS_STOP_1; 733 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 734 } 735 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 736 dev_dbg(dev, "Number of stop bits requested not supported by device\n"); 737 } 738 739 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 740 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16); 741 dev_dbg(dev, "%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n", 742 __func__, modem_ctl[0], modem_ctl[1], 743 modem_ctl[2], modem_ctl[3]); 744 745 if (cflag & CRTSCTS) { 746 modem_ctl[0] &= ~0x7B; 747 modem_ctl[0] |= 0x09; 748 modem_ctl[1] = 0x80; 749 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 750 } else { 751 modem_ctl[0] &= ~0x7B; 752 modem_ctl[0] |= 0x01; 753 modem_ctl[1] |= 0x40; 754 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 755 } 756 757 dev_dbg(dev, "%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n", 758 __func__, modem_ctl[0], modem_ctl[1], 759 modem_ctl[2], modem_ctl[3]); 760 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16); 761 } 762 763 } 764 765 static int cp210x_tiocmset(struct tty_struct *tty, 766 unsigned int set, unsigned int clear) 767 { 768 struct usb_serial_port *port = tty->driver_data; 769 return cp210x_tiocmset_port(port, set, clear); 770 } 771 772 static int cp210x_tiocmset_port(struct usb_serial_port *port, 773 unsigned int set, unsigned int clear) 774 { 775 unsigned int control = 0; 776 777 if (set & TIOCM_RTS) { 778 control |= CONTROL_RTS; 779 control |= CONTROL_WRITE_RTS; 780 } 781 if (set & TIOCM_DTR) { 782 control |= CONTROL_DTR; 783 control |= CONTROL_WRITE_DTR; 784 } 785 if (clear & TIOCM_RTS) { 786 control &= ~CONTROL_RTS; 787 control |= CONTROL_WRITE_RTS; 788 } 789 if (clear & TIOCM_DTR) { 790 control &= ~CONTROL_DTR; 791 control |= CONTROL_WRITE_DTR; 792 } 793 794 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control); 795 796 return cp210x_set_config(port, CP210X_SET_MHS, &control, 2); 797 } 798 799 static void cp210x_dtr_rts(struct usb_serial_port *p, int on) 800 { 801 if (on) 802 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0); 803 else 804 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS); 805 } 806 807 static int cp210x_tiocmget(struct tty_struct *tty) 808 { 809 struct usb_serial_port *port = tty->driver_data; 810 unsigned int control; 811 int result; 812 813 cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1); 814 815 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 816 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 817 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 818 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 819 |((control & CONTROL_RING)? TIOCM_RI : 0) 820 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 821 822 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control); 823 824 return result; 825 } 826 827 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 828 { 829 struct usb_serial_port *port = tty->driver_data; 830 unsigned int state; 831 832 if (break_state == 0) 833 state = BREAK_OFF; 834 else 835 state = BREAK_ON; 836 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 837 state == BREAK_OFF ? "off" : "on"); 838 cp210x_set_config(port, CP210X_SET_BREAK, &state, 2); 839 } 840 841 static int cp210x_startup(struct usb_serial *serial) 842 { 843 struct usb_host_interface *cur_altsetting; 844 struct cp210x_serial_private *spriv; 845 846 /* cp210x buffers behave strangely unless device is reset */ 847 usb_reset_device(serial->dev); 848 849 spriv = kzalloc(sizeof(*spriv), GFP_KERNEL); 850 if (!spriv) 851 return -ENOMEM; 852 853 cur_altsetting = serial->interface->cur_altsetting; 854 spriv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber; 855 856 usb_set_serial_data(serial, spriv); 857 858 return 0; 859 } 860 861 static void cp210x_release(struct usb_serial *serial) 862 { 863 struct cp210x_serial_private *spriv; 864 865 spriv = usb_get_serial_data(serial); 866 kfree(spriv); 867 } 868 869 module_usb_serial_driver(serial_drivers, id_table); 870 871 MODULE_DESCRIPTION(DRIVER_DESC); 872 MODULE_LICENSE("GPL"); 873