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(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 154 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 155 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 156 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 157 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 158 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 159 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 160 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 161 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 162 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 163 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 164 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 165 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 166 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 167 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 168 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 169 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 170 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 171 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 172 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 173 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 174 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 175 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 176 { } /* Terminating Entry */ 177 }; 178 179 MODULE_DEVICE_TABLE(usb, id_table); 180 181 struct cp210x_serial_private { 182 __u8 bInterfaceNumber; 183 }; 184 185 static struct usb_serial_driver cp210x_device = { 186 .driver = { 187 .owner = THIS_MODULE, 188 .name = "cp210x", 189 }, 190 .id_table = id_table, 191 .num_ports = 1, 192 .bulk_in_size = 256, 193 .bulk_out_size = 256, 194 .open = cp210x_open, 195 .close = cp210x_close, 196 .break_ctl = cp210x_break_ctl, 197 .set_termios = cp210x_set_termios, 198 .tiocmget = cp210x_tiocmget, 199 .tiocmset = cp210x_tiocmset, 200 .attach = cp210x_startup, 201 .release = cp210x_release, 202 .dtr_rts = cp210x_dtr_rts 203 }; 204 205 static struct usb_serial_driver * const serial_drivers[] = { 206 &cp210x_device, NULL 207 }; 208 209 /* Config request types */ 210 #define REQTYPE_HOST_TO_INTERFACE 0x41 211 #define REQTYPE_INTERFACE_TO_HOST 0xc1 212 #define REQTYPE_HOST_TO_DEVICE 0x40 213 #define REQTYPE_DEVICE_TO_HOST 0xc0 214 215 /* Config request codes */ 216 #define CP210X_IFC_ENABLE 0x00 217 #define CP210X_SET_BAUDDIV 0x01 218 #define CP210X_GET_BAUDDIV 0x02 219 #define CP210X_SET_LINE_CTL 0x03 220 #define CP210X_GET_LINE_CTL 0x04 221 #define CP210X_SET_BREAK 0x05 222 #define CP210X_IMM_CHAR 0x06 223 #define CP210X_SET_MHS 0x07 224 #define CP210X_GET_MDMSTS 0x08 225 #define CP210X_SET_XON 0x09 226 #define CP210X_SET_XOFF 0x0A 227 #define CP210X_SET_EVENTMASK 0x0B 228 #define CP210X_GET_EVENTMASK 0x0C 229 #define CP210X_SET_CHAR 0x0D 230 #define CP210X_GET_CHARS 0x0E 231 #define CP210X_GET_PROPS 0x0F 232 #define CP210X_GET_COMM_STATUS 0x10 233 #define CP210X_RESET 0x11 234 #define CP210X_PURGE 0x12 235 #define CP210X_SET_FLOW 0x13 236 #define CP210X_GET_FLOW 0x14 237 #define CP210X_EMBED_EVENTS 0x15 238 #define CP210X_GET_EVENTSTATE 0x16 239 #define CP210X_SET_CHARS 0x19 240 #define CP210X_GET_BAUDRATE 0x1D 241 #define CP210X_SET_BAUDRATE 0x1E 242 243 /* CP210X_IFC_ENABLE */ 244 #define UART_ENABLE 0x0001 245 #define UART_DISABLE 0x0000 246 247 /* CP210X_(SET|GET)_BAUDDIV */ 248 #define BAUD_RATE_GEN_FREQ 0x384000 249 250 /* CP210X_(SET|GET)_LINE_CTL */ 251 #define BITS_DATA_MASK 0X0f00 252 #define BITS_DATA_5 0X0500 253 #define BITS_DATA_6 0X0600 254 #define BITS_DATA_7 0X0700 255 #define BITS_DATA_8 0X0800 256 #define BITS_DATA_9 0X0900 257 258 #define BITS_PARITY_MASK 0x00f0 259 #define BITS_PARITY_NONE 0x0000 260 #define BITS_PARITY_ODD 0x0010 261 #define BITS_PARITY_EVEN 0x0020 262 #define BITS_PARITY_MARK 0x0030 263 #define BITS_PARITY_SPACE 0x0040 264 265 #define BITS_STOP_MASK 0x000f 266 #define BITS_STOP_1 0x0000 267 #define BITS_STOP_1_5 0x0001 268 #define BITS_STOP_2 0x0002 269 270 /* CP210X_SET_BREAK */ 271 #define BREAK_ON 0x0001 272 #define BREAK_OFF 0x0000 273 274 /* CP210X_(SET_MHS|GET_MDMSTS) */ 275 #define CONTROL_DTR 0x0001 276 #define CONTROL_RTS 0x0002 277 #define CONTROL_CTS 0x0010 278 #define CONTROL_DSR 0x0020 279 #define CONTROL_RING 0x0040 280 #define CONTROL_DCD 0x0080 281 #define CONTROL_WRITE_DTR 0x0100 282 #define CONTROL_WRITE_RTS 0x0200 283 284 /* 285 * cp210x_get_config 286 * Reads from the CP210x configuration registers 287 * 'size' is specified in bytes. 288 * 'data' is a pointer to a pre-allocated array of integers large 289 * enough to hold 'size' bytes (with 4 bytes to each integer) 290 */ 291 static int cp210x_get_config(struct usb_serial_port *port, u8 request, 292 unsigned int *data, int size) 293 { 294 struct usb_serial *serial = port->serial; 295 struct cp210x_serial_private *spriv = usb_get_serial_data(serial); 296 __le32 *buf; 297 int result, i, length; 298 299 /* Number of integers required to contain the array */ 300 length = (((size - 1) | 3) + 1) / 4; 301 302 buf = kcalloc(length, sizeof(__le32), GFP_KERNEL); 303 if (!buf) { 304 dev_err(&port->dev, "%s - out of memory.\n", __func__); 305 return -ENOMEM; 306 } 307 308 /* Issue the request, attempting to read 'size' bytes */ 309 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 310 request, REQTYPE_INTERFACE_TO_HOST, 0x0000, 311 spriv->bInterfaceNumber, buf, size, 312 USB_CTRL_GET_TIMEOUT); 313 314 /* Convert data into an array of integers */ 315 for (i = 0; i < length; i++) 316 data[i] = le32_to_cpu(buf[i]); 317 318 kfree(buf); 319 320 if (result != size) { 321 dev_dbg(&port->dev, "%s - Unable to send config request, request=0x%x size=%d result=%d\n", 322 __func__, request, size, result); 323 if (result > 0) 324 result = -EPROTO; 325 326 return result; 327 } 328 329 return 0; 330 } 331 332 /* 333 * cp210x_set_config 334 * Writes to the CP210x configuration registers 335 * Values less than 16 bits wide are sent directly 336 * 'size' is specified in bytes. 337 */ 338 static int cp210x_set_config(struct usb_serial_port *port, u8 request, 339 unsigned int *data, int size) 340 { 341 struct usb_serial *serial = port->serial; 342 struct cp210x_serial_private *spriv = usb_get_serial_data(serial); 343 __le32 *buf; 344 int result, i, length; 345 346 /* Number of integers required to contain the array */ 347 length = (((size - 1) | 3) + 1) / 4; 348 349 buf = kmalloc(length * sizeof(__le32), GFP_KERNEL); 350 if (!buf) { 351 dev_err(&port->dev, "%s - out of memory.\n", __func__); 352 return -ENOMEM; 353 } 354 355 /* Array of integers into bytes */ 356 for (i = 0; i < length; i++) 357 buf[i] = cpu_to_le32(data[i]); 358 359 if (size > 2) { 360 result = usb_control_msg(serial->dev, 361 usb_sndctrlpipe(serial->dev, 0), 362 request, REQTYPE_HOST_TO_INTERFACE, 0x0000, 363 spriv->bInterfaceNumber, buf, size, 364 USB_CTRL_SET_TIMEOUT); 365 } else { 366 result = usb_control_msg(serial->dev, 367 usb_sndctrlpipe(serial->dev, 0), 368 request, REQTYPE_HOST_TO_INTERFACE, data[0], 369 spriv->bInterfaceNumber, NULL, 0, 370 USB_CTRL_SET_TIMEOUT); 371 } 372 373 kfree(buf); 374 375 if ((size > 2 && result != size) || result < 0) { 376 dev_dbg(&port->dev, "%s - Unable to send request, request=0x%x size=%d result=%d\n", 377 __func__, request, size, result); 378 if (result > 0) 379 result = -EPROTO; 380 381 return result; 382 } 383 384 return 0; 385 } 386 387 /* 388 * cp210x_set_config_single 389 * Convenience function for calling cp210x_set_config on single data values 390 * without requiring an integer pointer 391 */ 392 static inline int cp210x_set_config_single(struct usb_serial_port *port, 393 u8 request, unsigned int data) 394 { 395 return cp210x_set_config(port, request, &data, 2); 396 } 397 398 /* 399 * cp210x_quantise_baudrate 400 * Quantises the baud rate as per AN205 Table 1 401 */ 402 static unsigned int cp210x_quantise_baudrate(unsigned int baud) 403 { 404 if (baud <= 300) 405 baud = 300; 406 else if (baud <= 600) baud = 600; 407 else if (baud <= 1200) baud = 1200; 408 else if (baud <= 1800) baud = 1800; 409 else if (baud <= 2400) baud = 2400; 410 else if (baud <= 4000) baud = 4000; 411 else if (baud <= 4803) baud = 4800; 412 else if (baud <= 7207) baud = 7200; 413 else if (baud <= 9612) baud = 9600; 414 else if (baud <= 14428) baud = 14400; 415 else if (baud <= 16062) baud = 16000; 416 else if (baud <= 19250) baud = 19200; 417 else if (baud <= 28912) baud = 28800; 418 else if (baud <= 38601) baud = 38400; 419 else if (baud <= 51558) baud = 51200; 420 else if (baud <= 56280) baud = 56000; 421 else if (baud <= 58053) baud = 57600; 422 else if (baud <= 64111) baud = 64000; 423 else if (baud <= 77608) baud = 76800; 424 else if (baud <= 117028) baud = 115200; 425 else if (baud <= 129347) baud = 128000; 426 else if (baud <= 156868) baud = 153600; 427 else if (baud <= 237832) baud = 230400; 428 else if (baud <= 254234) baud = 250000; 429 else if (baud <= 273066) baud = 256000; 430 else if (baud <= 491520) baud = 460800; 431 else if (baud <= 567138) baud = 500000; 432 else if (baud <= 670254) baud = 576000; 433 else if (baud < 1000000) 434 baud = 921600; 435 else if (baud > 2000000) 436 baud = 2000000; 437 return baud; 438 } 439 440 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 441 { 442 int result; 443 444 result = cp210x_set_config_single(port, CP210X_IFC_ENABLE, 445 UART_ENABLE); 446 if (result) { 447 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 448 return result; 449 } 450 451 /* Configure the termios structure */ 452 cp210x_get_termios(tty, port); 453 454 /* The baud rate must be initialised on cp2104 */ 455 if (tty) 456 cp210x_change_speed(tty, port, NULL); 457 458 return usb_serial_generic_open(tty, port); 459 } 460 461 static void cp210x_close(struct usb_serial_port *port) 462 { 463 usb_serial_generic_close(port); 464 465 mutex_lock(&port->serial->disc_mutex); 466 if (!port->serial->disconnected) 467 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE); 468 mutex_unlock(&port->serial->disc_mutex); 469 } 470 471 /* 472 * cp210x_get_termios 473 * Reads the baud rate, data bits, parity, stop bits and flow control mode 474 * from the device, corrects any unsupported values, and configures the 475 * termios structure to reflect the state of the device 476 */ 477 static void cp210x_get_termios(struct tty_struct *tty, 478 struct usb_serial_port *port) 479 { 480 unsigned int baud; 481 482 if (tty) { 483 cp210x_get_termios_port(tty->driver_data, 484 &tty->termios.c_cflag, &baud); 485 tty_encode_baud_rate(tty, baud, baud); 486 } else { 487 unsigned int cflag; 488 cflag = 0; 489 cp210x_get_termios_port(port, &cflag, &baud); 490 } 491 } 492 493 /* 494 * cp210x_get_termios_port 495 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port. 496 */ 497 static void cp210x_get_termios_port(struct usb_serial_port *port, 498 unsigned int *cflagp, unsigned int *baudp) 499 { 500 struct device *dev = &port->dev; 501 unsigned int cflag, modem_ctl[4]; 502 unsigned int baud; 503 unsigned int bits; 504 505 cp210x_get_config(port, CP210X_GET_BAUDRATE, &baud, 4); 506 507 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud); 508 *baudp = baud; 509 510 cflag = *cflagp; 511 512 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 513 cflag &= ~CSIZE; 514 switch (bits & BITS_DATA_MASK) { 515 case BITS_DATA_5: 516 dev_dbg(dev, "%s - data bits = 5\n", __func__); 517 cflag |= CS5; 518 break; 519 case BITS_DATA_6: 520 dev_dbg(dev, "%s - data bits = 6\n", __func__); 521 cflag |= CS6; 522 break; 523 case BITS_DATA_7: 524 dev_dbg(dev, "%s - data bits = 7\n", __func__); 525 cflag |= CS7; 526 break; 527 case BITS_DATA_8: 528 dev_dbg(dev, "%s - data bits = 8\n", __func__); 529 cflag |= CS8; 530 break; 531 case BITS_DATA_9: 532 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__); 533 cflag |= CS8; 534 bits &= ~BITS_DATA_MASK; 535 bits |= BITS_DATA_8; 536 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 537 break; 538 default: 539 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__); 540 cflag |= CS8; 541 bits &= ~BITS_DATA_MASK; 542 bits |= BITS_DATA_8; 543 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 544 break; 545 } 546 547 switch (bits & BITS_PARITY_MASK) { 548 case BITS_PARITY_NONE: 549 dev_dbg(dev, "%s - parity = NONE\n", __func__); 550 cflag &= ~PARENB; 551 break; 552 case BITS_PARITY_ODD: 553 dev_dbg(dev, "%s - parity = ODD\n", __func__); 554 cflag |= (PARENB|PARODD); 555 break; 556 case BITS_PARITY_EVEN: 557 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 558 cflag &= ~PARODD; 559 cflag |= PARENB; 560 break; 561 case BITS_PARITY_MARK: 562 dev_dbg(dev, "%s - parity = MARK\n", __func__); 563 cflag |= (PARENB|PARODD|CMSPAR); 564 break; 565 case BITS_PARITY_SPACE: 566 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 567 cflag &= ~PARODD; 568 cflag |= (PARENB|CMSPAR); 569 break; 570 default: 571 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__); 572 cflag &= ~PARENB; 573 bits &= ~BITS_PARITY_MASK; 574 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 575 break; 576 } 577 578 cflag &= ~CSTOPB; 579 switch (bits & BITS_STOP_MASK) { 580 case BITS_STOP_1: 581 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 582 break; 583 case BITS_STOP_1_5: 584 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__); 585 bits &= ~BITS_STOP_MASK; 586 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 587 break; 588 case BITS_STOP_2: 589 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 590 cflag |= CSTOPB; 591 break; 592 default: 593 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__); 594 bits &= ~BITS_STOP_MASK; 595 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 596 break; 597 } 598 599 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16); 600 if (modem_ctl[0] & 0x0008) { 601 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 602 cflag |= CRTSCTS; 603 } else { 604 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 605 cflag &= ~CRTSCTS; 606 } 607 608 *cflagp = cflag; 609 } 610 611 /* 612 * CP2101 supports the following baud rates: 613 * 614 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 615 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 616 * 617 * CP2102 and CP2103 support the following additional rates: 618 * 619 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 620 * 576000 621 * 622 * The device will map a requested rate to a supported one, but the result 623 * of requests for rates greater than 1053257 is undefined (see AN205). 624 * 625 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 626 * respectively, with an error less than 1%. The actual rates are determined 627 * by 628 * 629 * div = round(freq / (2 x prescale x request)) 630 * actual = freq / (2 x prescale x div) 631 * 632 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 633 * or 1 otherwise. 634 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 635 * otherwise. 636 */ 637 static void cp210x_change_speed(struct tty_struct *tty, 638 struct usb_serial_port *port, struct ktermios *old_termios) 639 { 640 u32 baud; 641 642 baud = tty->termios.c_ospeed; 643 644 /* This maps the requested rate to a rate valid on cp2102 or cp2103, 645 * or to an arbitrary rate in [1M,2M]. 646 * 647 * NOTE: B0 is not implemented. 648 */ 649 baud = cp210x_quantise_baudrate(baud); 650 651 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 652 if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud, 653 sizeof(baud))) { 654 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 655 if (old_termios) 656 baud = old_termios->c_ospeed; 657 else 658 baud = 9600; 659 } 660 661 tty_encode_baud_rate(tty, baud, baud); 662 } 663 664 static void cp210x_set_termios(struct tty_struct *tty, 665 struct usb_serial_port *port, struct ktermios *old_termios) 666 { 667 struct device *dev = &port->dev; 668 unsigned int cflag, old_cflag; 669 unsigned int bits; 670 unsigned int modem_ctl[4]; 671 672 dev_dbg(dev, "%s - port %d\n", __func__, port->number); 673 674 if (!tty) 675 return; 676 677 cflag = tty->termios.c_cflag; 678 old_cflag = old_termios->c_cflag; 679 680 if (tty->termios.c_ospeed != old_termios->c_ospeed) 681 cp210x_change_speed(tty, port, old_termios); 682 683 /* If the number of data bits is to be updated */ 684 if ((cflag & CSIZE) != (old_cflag & CSIZE)) { 685 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 686 bits &= ~BITS_DATA_MASK; 687 switch (cflag & CSIZE) { 688 case CS5: 689 bits |= BITS_DATA_5; 690 dev_dbg(dev, "%s - data bits = 5\n", __func__); 691 break; 692 case CS6: 693 bits |= BITS_DATA_6; 694 dev_dbg(dev, "%s - data bits = 6\n", __func__); 695 break; 696 case CS7: 697 bits |= BITS_DATA_7; 698 dev_dbg(dev, "%s - data bits = 7\n", __func__); 699 break; 700 case CS8: 701 bits |= BITS_DATA_8; 702 dev_dbg(dev, "%s - data bits = 8\n", __func__); 703 break; 704 /*case CS9: 705 bits |= BITS_DATA_9; 706 dev_dbg(dev, "%s - data bits = 9\n", __func__); 707 break;*/ 708 default: 709 dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n"); 710 bits |= BITS_DATA_8; 711 break; 712 } 713 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 714 dev_dbg(dev, "Number of data bits requested not supported by device\n"); 715 } 716 717 if ((cflag & (PARENB|PARODD|CMSPAR)) != 718 (old_cflag & (PARENB|PARODD|CMSPAR))) { 719 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 720 bits &= ~BITS_PARITY_MASK; 721 if (cflag & PARENB) { 722 if (cflag & CMSPAR) { 723 if (cflag & PARODD) { 724 bits |= BITS_PARITY_MARK; 725 dev_dbg(dev, "%s - parity = MARK\n", __func__); 726 } else { 727 bits |= BITS_PARITY_SPACE; 728 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 729 } 730 } else { 731 if (cflag & PARODD) { 732 bits |= BITS_PARITY_ODD; 733 dev_dbg(dev, "%s - parity = ODD\n", __func__); 734 } else { 735 bits |= BITS_PARITY_EVEN; 736 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 737 } 738 } 739 } 740 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 741 dev_dbg(dev, "Parity mode not supported by device\n"); 742 } 743 744 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { 745 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 746 bits &= ~BITS_STOP_MASK; 747 if (cflag & CSTOPB) { 748 bits |= BITS_STOP_2; 749 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 750 } else { 751 bits |= BITS_STOP_1; 752 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 753 } 754 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 755 dev_dbg(dev, "Number of stop bits requested not supported by device\n"); 756 } 757 758 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 759 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16); 760 dev_dbg(dev, "%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n", 761 __func__, modem_ctl[0], modem_ctl[1], 762 modem_ctl[2], modem_ctl[3]); 763 764 if (cflag & CRTSCTS) { 765 modem_ctl[0] &= ~0x7B; 766 modem_ctl[0] |= 0x09; 767 modem_ctl[1] = 0x80; 768 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 769 } else { 770 modem_ctl[0] &= ~0x7B; 771 modem_ctl[0] |= 0x01; 772 modem_ctl[1] |= 0x40; 773 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 774 } 775 776 dev_dbg(dev, "%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n", 777 __func__, modem_ctl[0], modem_ctl[1], 778 modem_ctl[2], modem_ctl[3]); 779 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16); 780 } 781 782 } 783 784 static int cp210x_tiocmset(struct tty_struct *tty, 785 unsigned int set, unsigned int clear) 786 { 787 struct usb_serial_port *port = tty->driver_data; 788 return cp210x_tiocmset_port(port, set, clear); 789 } 790 791 static int cp210x_tiocmset_port(struct usb_serial_port *port, 792 unsigned int set, unsigned int clear) 793 { 794 unsigned int control = 0; 795 796 if (set & TIOCM_RTS) { 797 control |= CONTROL_RTS; 798 control |= CONTROL_WRITE_RTS; 799 } 800 if (set & TIOCM_DTR) { 801 control |= CONTROL_DTR; 802 control |= CONTROL_WRITE_DTR; 803 } 804 if (clear & TIOCM_RTS) { 805 control &= ~CONTROL_RTS; 806 control |= CONTROL_WRITE_RTS; 807 } 808 if (clear & TIOCM_DTR) { 809 control &= ~CONTROL_DTR; 810 control |= CONTROL_WRITE_DTR; 811 } 812 813 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control); 814 815 return cp210x_set_config(port, CP210X_SET_MHS, &control, 2); 816 } 817 818 static void cp210x_dtr_rts(struct usb_serial_port *p, int on) 819 { 820 if (on) 821 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0); 822 else 823 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS); 824 } 825 826 static int cp210x_tiocmget(struct tty_struct *tty) 827 { 828 struct usb_serial_port *port = tty->driver_data; 829 unsigned int control; 830 int result; 831 832 cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1); 833 834 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 835 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 836 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 837 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 838 |((control & CONTROL_RING)? TIOCM_RI : 0) 839 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 840 841 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control); 842 843 return result; 844 } 845 846 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 847 { 848 struct usb_serial_port *port = tty->driver_data; 849 unsigned int state; 850 851 if (break_state == 0) 852 state = BREAK_OFF; 853 else 854 state = BREAK_ON; 855 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 856 state == BREAK_OFF ? "off" : "on"); 857 cp210x_set_config(port, CP210X_SET_BREAK, &state, 2); 858 } 859 860 static int cp210x_startup(struct usb_serial *serial) 861 { 862 struct usb_host_interface *cur_altsetting; 863 struct cp210x_serial_private *spriv; 864 865 /* cp210x buffers behave strangely unless device is reset */ 866 usb_reset_device(serial->dev); 867 868 spriv = kzalloc(sizeof(*spriv), GFP_KERNEL); 869 if (!spriv) 870 return -ENOMEM; 871 872 cur_altsetting = serial->interface->cur_altsetting; 873 spriv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber; 874 875 usb_set_serial_data(serial, spriv); 876 877 return 0; 878 } 879 880 static void cp210x_release(struct usb_serial *serial) 881 { 882 struct cp210x_serial_private *spriv; 883 884 spriv = usb_get_serial_data(serial); 885 kfree(spriv); 886 } 887 888 module_usb_serial_driver(serial_drivers, id_table); 889 890 MODULE_DESCRIPTION(DRIVER_DESC); 891 MODULE_LICENSE("GPL"); 892