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 bool cp210x_tx_empty(struct usb_serial_port *port); 42 static int cp210x_tiocmget(struct tty_struct *); 43 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int); 44 static int cp210x_tiocmset_port(struct usb_serial_port *port, 45 unsigned int, unsigned int); 46 static void cp210x_break_ctl(struct tty_struct *, int); 47 static int cp210x_port_probe(struct usb_serial_port *); 48 static int cp210x_port_remove(struct usb_serial_port *); 49 static void cp210x_dtr_rts(struct usb_serial_port *p, int on); 50 51 static const struct usb_device_id id_table[] = { 52 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */ 53 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */ 54 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 55 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 56 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */ 57 { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */ 58 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */ 59 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */ 60 { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */ 61 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */ 62 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */ 63 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */ 64 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */ 65 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */ 66 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */ 67 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */ 68 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */ 69 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */ 70 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */ 71 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */ 72 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */ 73 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */ 74 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */ 75 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */ 76 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */ 77 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */ 78 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */ 79 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */ 80 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */ 81 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */ 82 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */ 83 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */ 84 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */ 85 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */ 86 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */ 87 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */ 88 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */ 89 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */ 90 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */ 91 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */ 92 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */ 93 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */ 94 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */ 95 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */ 96 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */ 97 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */ 98 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */ 99 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */ 100 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */ 101 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */ 102 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */ 103 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */ 104 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */ 105 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */ 106 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */ 107 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */ 108 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */ 109 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */ 110 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */ 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, 0x85F8) }, /* Virtenio Preon32 */ 124 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 125 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 126 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */ 127 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */ 128 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */ 129 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */ 130 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */ 131 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */ 132 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */ 133 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */ 134 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 135 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 136 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 137 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 138 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 139 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 140 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 141 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 142 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 143 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 144 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 145 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 146 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */ 147 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */ 148 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 149 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */ 150 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */ 151 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */ 152 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */ 153 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */ 154 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */ 155 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 156 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ 157 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ 158 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ 159 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ 160 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ 161 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ 162 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 163 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 164 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 165 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */ 166 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */ 167 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */ 168 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */ 169 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 170 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */ 171 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 172 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 173 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 174 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 175 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 176 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 177 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 178 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 179 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 180 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 181 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 182 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 183 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 184 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 185 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 186 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 187 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 188 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 189 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 190 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 191 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 192 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */ 193 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 194 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 195 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 196 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 197 { } /* Terminating Entry */ 198 }; 199 200 MODULE_DEVICE_TABLE(usb, id_table); 201 202 struct cp210x_port_private { 203 __u8 bInterfaceNumber; 204 bool has_swapped_line_ctl; 205 }; 206 207 static struct usb_serial_driver cp210x_device = { 208 .driver = { 209 .owner = THIS_MODULE, 210 .name = "cp210x", 211 }, 212 .id_table = id_table, 213 .num_ports = 1, 214 .bulk_in_size = 256, 215 .bulk_out_size = 256, 216 .open = cp210x_open, 217 .close = cp210x_close, 218 .break_ctl = cp210x_break_ctl, 219 .set_termios = cp210x_set_termios, 220 .tx_empty = cp210x_tx_empty, 221 .tiocmget = cp210x_tiocmget, 222 .tiocmset = cp210x_tiocmset, 223 .port_probe = cp210x_port_probe, 224 .port_remove = cp210x_port_remove, 225 .dtr_rts = cp210x_dtr_rts 226 }; 227 228 static struct usb_serial_driver * const serial_drivers[] = { 229 &cp210x_device, NULL 230 }; 231 232 /* Config request types */ 233 #define REQTYPE_HOST_TO_INTERFACE 0x41 234 #define REQTYPE_INTERFACE_TO_HOST 0xc1 235 #define REQTYPE_HOST_TO_DEVICE 0x40 236 #define REQTYPE_DEVICE_TO_HOST 0xc0 237 238 /* Config request codes */ 239 #define CP210X_IFC_ENABLE 0x00 240 #define CP210X_SET_BAUDDIV 0x01 241 #define CP210X_GET_BAUDDIV 0x02 242 #define CP210X_SET_LINE_CTL 0x03 243 #define CP210X_GET_LINE_CTL 0x04 244 #define CP210X_SET_BREAK 0x05 245 #define CP210X_IMM_CHAR 0x06 246 #define CP210X_SET_MHS 0x07 247 #define CP210X_GET_MDMSTS 0x08 248 #define CP210X_SET_XON 0x09 249 #define CP210X_SET_XOFF 0x0A 250 #define CP210X_SET_EVENTMASK 0x0B 251 #define CP210X_GET_EVENTMASK 0x0C 252 #define CP210X_SET_CHAR 0x0D 253 #define CP210X_GET_CHARS 0x0E 254 #define CP210X_GET_PROPS 0x0F 255 #define CP210X_GET_COMM_STATUS 0x10 256 #define CP210X_RESET 0x11 257 #define CP210X_PURGE 0x12 258 #define CP210X_SET_FLOW 0x13 259 #define CP210X_GET_FLOW 0x14 260 #define CP210X_EMBED_EVENTS 0x15 261 #define CP210X_GET_EVENTSTATE 0x16 262 #define CP210X_SET_CHARS 0x19 263 #define CP210X_GET_BAUDRATE 0x1D 264 #define CP210X_SET_BAUDRATE 0x1E 265 266 /* CP210X_IFC_ENABLE */ 267 #define UART_ENABLE 0x0001 268 #define UART_DISABLE 0x0000 269 270 /* CP210X_(SET|GET)_BAUDDIV */ 271 #define BAUD_RATE_GEN_FREQ 0x384000 272 273 /* CP210X_(SET|GET)_LINE_CTL */ 274 #define BITS_DATA_MASK 0X0f00 275 #define BITS_DATA_5 0X0500 276 #define BITS_DATA_6 0X0600 277 #define BITS_DATA_7 0X0700 278 #define BITS_DATA_8 0X0800 279 #define BITS_DATA_9 0X0900 280 281 #define BITS_PARITY_MASK 0x00f0 282 #define BITS_PARITY_NONE 0x0000 283 #define BITS_PARITY_ODD 0x0010 284 #define BITS_PARITY_EVEN 0x0020 285 #define BITS_PARITY_MARK 0x0030 286 #define BITS_PARITY_SPACE 0x0040 287 288 #define BITS_STOP_MASK 0x000f 289 #define BITS_STOP_1 0x0000 290 #define BITS_STOP_1_5 0x0001 291 #define BITS_STOP_2 0x0002 292 293 /* CP210X_SET_BREAK */ 294 #define BREAK_ON 0x0001 295 #define BREAK_OFF 0x0000 296 297 /* CP210X_(SET_MHS|GET_MDMSTS) */ 298 #define CONTROL_DTR 0x0001 299 #define CONTROL_RTS 0x0002 300 #define CONTROL_CTS 0x0010 301 #define CONTROL_DSR 0x0020 302 #define CONTROL_RING 0x0040 303 #define CONTROL_DCD 0x0080 304 #define CONTROL_WRITE_DTR 0x0100 305 #define CONTROL_WRITE_RTS 0x0200 306 307 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 308 struct cp210x_comm_status { 309 __le32 ulErrors; 310 __le32 ulHoldReasons; 311 __le32 ulAmountInInQueue; 312 __le32 ulAmountInOutQueue; 313 u8 bEofReceived; 314 u8 bWaitForImmediate; 315 u8 bReserved; 316 } __packed; 317 318 /* 319 * CP210X_PURGE - 16 bits passed in wValue of USB request. 320 * SiLabs app note AN571 gives a strange description of the 4 bits: 321 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 322 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 323 */ 324 #define PURGE_ALL 0x000f 325 326 /* 327 * cp210x_get_config 328 * Reads from the CP210x configuration registers 329 * 'size' is specified in bytes. 330 * 'data' is a pointer to a pre-allocated array of integers large 331 * enough to hold 'size' bytes (with 4 bytes to each integer) 332 */ 333 static int cp210x_get_config(struct usb_serial_port *port, u8 request, 334 unsigned int *data, int size) 335 { 336 struct usb_serial *serial = port->serial; 337 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 338 __le32 *buf; 339 int result, i, length; 340 341 /* Number of integers required to contain the array */ 342 length = (((size - 1) | 3) + 1) / 4; 343 344 buf = kcalloc(length, sizeof(__le32), GFP_KERNEL); 345 if (!buf) 346 return -ENOMEM; 347 348 /* Issue the request, attempting to read 'size' bytes */ 349 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 350 request, REQTYPE_INTERFACE_TO_HOST, 0x0000, 351 port_priv->bInterfaceNumber, buf, size, 352 USB_CTRL_GET_TIMEOUT); 353 354 /* Convert data into an array of integers */ 355 for (i = 0; i < length; i++) 356 data[i] = le32_to_cpu(buf[i]); 357 358 kfree(buf); 359 360 if (result != size) { 361 dev_dbg(&port->dev, "%s - Unable to send config request, request=0x%x size=%d result=%d\n", 362 __func__, request, size, result); 363 if (result > 0) 364 result = -EPROTO; 365 366 return result; 367 } 368 369 return 0; 370 } 371 372 /* 373 * cp210x_set_config 374 * Writes to the CP210x configuration registers 375 * Values less than 16 bits wide are sent directly 376 * 'size' is specified in bytes. 377 */ 378 static int cp210x_set_config(struct usb_serial_port *port, u8 request, 379 unsigned int *data, int size) 380 { 381 struct usb_serial *serial = port->serial; 382 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 383 __le32 *buf; 384 int result, i, length; 385 386 /* Number of integers required to contain the array */ 387 length = (((size - 1) | 3) + 1) / 4; 388 389 buf = kmalloc(length * sizeof(__le32), GFP_KERNEL); 390 if (!buf) 391 return -ENOMEM; 392 393 /* Array of integers into bytes */ 394 for (i = 0; i < length; i++) 395 buf[i] = cpu_to_le32(data[i]); 396 397 if (size > 2) { 398 result = usb_control_msg(serial->dev, 399 usb_sndctrlpipe(serial->dev, 0), 400 request, REQTYPE_HOST_TO_INTERFACE, 0x0000, 401 port_priv->bInterfaceNumber, buf, size, 402 USB_CTRL_SET_TIMEOUT); 403 } else { 404 result = usb_control_msg(serial->dev, 405 usb_sndctrlpipe(serial->dev, 0), 406 request, REQTYPE_HOST_TO_INTERFACE, data[0], 407 port_priv->bInterfaceNumber, NULL, 0, 408 USB_CTRL_SET_TIMEOUT); 409 } 410 411 kfree(buf); 412 413 if ((size > 2 && result != size) || result < 0) { 414 dev_dbg(&port->dev, "%s - Unable to send request, request=0x%x size=%d result=%d\n", 415 __func__, request, size, result); 416 if (result > 0) 417 result = -EPROTO; 418 419 return result; 420 } 421 422 return 0; 423 } 424 425 /* 426 * cp210x_set_config_single 427 * Convenience function for calling cp210x_set_config on single data values 428 * without requiring an integer pointer 429 */ 430 static inline int cp210x_set_config_single(struct usb_serial_port *port, 431 u8 request, unsigned int data) 432 { 433 return cp210x_set_config(port, request, &data, 2); 434 } 435 436 /* 437 * Detect CP2108 GET_LINE_CTL bug and activate workaround. 438 * Write a known good value 0x800, read it back. 439 * If it comes back swapped the bug is detected. 440 * Preserve the original register value. 441 */ 442 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port) 443 { 444 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 445 unsigned int line_ctl_save; 446 unsigned int line_ctl_test; 447 int err; 448 449 err = cp210x_get_config(port, CP210X_GET_LINE_CTL, &line_ctl_save, 2); 450 if (err) 451 return err; 452 453 line_ctl_test = 0x800; 454 err = cp210x_set_config(port, CP210X_SET_LINE_CTL, &line_ctl_test, 2); 455 if (err) 456 return err; 457 458 err = cp210x_get_config(port, CP210X_GET_LINE_CTL, &line_ctl_test, 2); 459 if (err) 460 return err; 461 462 if (line_ctl_test == 8) { 463 port_priv->has_swapped_line_ctl = true; 464 line_ctl_save = swab16((u16)line_ctl_save); 465 } 466 467 return cp210x_set_config(port, CP210X_SET_LINE_CTL, &line_ctl_save, 2); 468 } 469 470 /* 471 * Must always be called instead of cp210x_get_config(CP210X_GET_LINE_CTL) 472 * to workaround cp2108 bug and get correct value. 473 */ 474 static int cp210x_get_line_ctl(struct usb_serial_port *port, unsigned int *ctl) 475 { 476 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 477 int err; 478 479 err = cp210x_get_config(port, CP210X_GET_LINE_CTL, ctl, 2); 480 if (err) 481 return err; 482 483 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */ 484 if (port_priv->has_swapped_line_ctl) 485 *ctl = swab16((u16)(*ctl)); 486 487 return 0; 488 } 489 490 /* 491 * cp210x_quantise_baudrate 492 * Quantises the baud rate as per AN205 Table 1 493 */ 494 static unsigned int cp210x_quantise_baudrate(unsigned int baud) 495 { 496 if (baud <= 300) 497 baud = 300; 498 else if (baud <= 600) baud = 600; 499 else if (baud <= 1200) baud = 1200; 500 else if (baud <= 1800) baud = 1800; 501 else if (baud <= 2400) baud = 2400; 502 else if (baud <= 4000) baud = 4000; 503 else if (baud <= 4803) baud = 4800; 504 else if (baud <= 7207) baud = 7200; 505 else if (baud <= 9612) baud = 9600; 506 else if (baud <= 14428) baud = 14400; 507 else if (baud <= 16062) baud = 16000; 508 else if (baud <= 19250) baud = 19200; 509 else if (baud <= 28912) baud = 28800; 510 else if (baud <= 38601) baud = 38400; 511 else if (baud <= 51558) baud = 51200; 512 else if (baud <= 56280) baud = 56000; 513 else if (baud <= 58053) baud = 57600; 514 else if (baud <= 64111) baud = 64000; 515 else if (baud <= 77608) baud = 76800; 516 else if (baud <= 117028) baud = 115200; 517 else if (baud <= 129347) baud = 128000; 518 else if (baud <= 156868) baud = 153600; 519 else if (baud <= 237832) baud = 230400; 520 else if (baud <= 254234) baud = 250000; 521 else if (baud <= 273066) baud = 256000; 522 else if (baud <= 491520) baud = 460800; 523 else if (baud <= 567138) baud = 500000; 524 else if (baud <= 670254) baud = 576000; 525 else if (baud < 1000000) 526 baud = 921600; 527 else if (baud > 2000000) 528 baud = 2000000; 529 return baud; 530 } 531 532 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 533 { 534 int result; 535 536 result = cp210x_set_config_single(port, CP210X_IFC_ENABLE, 537 UART_ENABLE); 538 if (result) { 539 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 540 return result; 541 } 542 543 /* Configure the termios structure */ 544 cp210x_get_termios(tty, port); 545 546 /* The baud rate must be initialised on cp2104 */ 547 if (tty) 548 cp210x_change_speed(tty, port, NULL); 549 550 return usb_serial_generic_open(tty, port); 551 } 552 553 static void cp210x_close(struct usb_serial_port *port) 554 { 555 unsigned int purge_ctl; 556 557 usb_serial_generic_close(port); 558 559 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 560 purge_ctl = PURGE_ALL; 561 cp210x_set_config(port, CP210X_PURGE, &purge_ctl, 2); 562 563 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE); 564 } 565 566 /* 567 * Read how many bytes are waiting in the TX queue. 568 */ 569 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 570 u32 *count) 571 { 572 struct usb_serial *serial = port->serial; 573 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 574 struct cp210x_comm_status *sts; 575 int result; 576 577 sts = kmalloc(sizeof(*sts), GFP_KERNEL); 578 if (!sts) 579 return -ENOMEM; 580 581 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 582 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST, 583 0, port_priv->bInterfaceNumber, sts, sizeof(*sts), 584 USB_CTRL_GET_TIMEOUT); 585 if (result == sizeof(*sts)) { 586 *count = le32_to_cpu(sts->ulAmountInOutQueue); 587 result = 0; 588 } else { 589 dev_err(&port->dev, "failed to get comm status: %d\n", result); 590 if (result >= 0) 591 result = -EPROTO; 592 } 593 594 kfree(sts); 595 596 return result; 597 } 598 599 static bool cp210x_tx_empty(struct usb_serial_port *port) 600 { 601 int err; 602 u32 count; 603 604 err = cp210x_get_tx_queue_byte_count(port, &count); 605 if (err) 606 return true; 607 608 return !count; 609 } 610 611 /* 612 * cp210x_get_termios 613 * Reads the baud rate, data bits, parity, stop bits and flow control mode 614 * from the device, corrects any unsupported values, and configures the 615 * termios structure to reflect the state of the device 616 */ 617 static void cp210x_get_termios(struct tty_struct *tty, 618 struct usb_serial_port *port) 619 { 620 unsigned int baud; 621 622 if (tty) { 623 cp210x_get_termios_port(tty->driver_data, 624 &tty->termios.c_cflag, &baud); 625 tty_encode_baud_rate(tty, baud, baud); 626 } else { 627 unsigned int cflag; 628 cflag = 0; 629 cp210x_get_termios_port(port, &cflag, &baud); 630 } 631 } 632 633 /* 634 * cp210x_get_termios_port 635 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port. 636 */ 637 static void cp210x_get_termios_port(struct usb_serial_port *port, 638 unsigned int *cflagp, unsigned int *baudp) 639 { 640 struct device *dev = &port->dev; 641 unsigned int cflag, modem_ctl[4]; 642 unsigned int baud; 643 unsigned int bits; 644 645 cp210x_get_config(port, CP210X_GET_BAUDRATE, &baud, 4); 646 647 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud); 648 *baudp = baud; 649 650 cflag = *cflagp; 651 652 cp210x_get_line_ctl(port, &bits); 653 cflag &= ~CSIZE; 654 switch (bits & BITS_DATA_MASK) { 655 case BITS_DATA_5: 656 dev_dbg(dev, "%s - data bits = 5\n", __func__); 657 cflag |= CS5; 658 break; 659 case BITS_DATA_6: 660 dev_dbg(dev, "%s - data bits = 6\n", __func__); 661 cflag |= CS6; 662 break; 663 case BITS_DATA_7: 664 dev_dbg(dev, "%s - data bits = 7\n", __func__); 665 cflag |= CS7; 666 break; 667 case BITS_DATA_8: 668 dev_dbg(dev, "%s - data bits = 8\n", __func__); 669 cflag |= CS8; 670 break; 671 case BITS_DATA_9: 672 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__); 673 cflag |= CS8; 674 bits &= ~BITS_DATA_MASK; 675 bits |= BITS_DATA_8; 676 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 677 break; 678 default: 679 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__); 680 cflag |= CS8; 681 bits &= ~BITS_DATA_MASK; 682 bits |= BITS_DATA_8; 683 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 684 break; 685 } 686 687 switch (bits & BITS_PARITY_MASK) { 688 case BITS_PARITY_NONE: 689 dev_dbg(dev, "%s - parity = NONE\n", __func__); 690 cflag &= ~PARENB; 691 break; 692 case BITS_PARITY_ODD: 693 dev_dbg(dev, "%s - parity = ODD\n", __func__); 694 cflag |= (PARENB|PARODD); 695 break; 696 case BITS_PARITY_EVEN: 697 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 698 cflag &= ~PARODD; 699 cflag |= PARENB; 700 break; 701 case BITS_PARITY_MARK: 702 dev_dbg(dev, "%s - parity = MARK\n", __func__); 703 cflag |= (PARENB|PARODD|CMSPAR); 704 break; 705 case BITS_PARITY_SPACE: 706 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 707 cflag &= ~PARODD; 708 cflag |= (PARENB|CMSPAR); 709 break; 710 default: 711 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__); 712 cflag &= ~PARENB; 713 bits &= ~BITS_PARITY_MASK; 714 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 715 break; 716 } 717 718 cflag &= ~CSTOPB; 719 switch (bits & BITS_STOP_MASK) { 720 case BITS_STOP_1: 721 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 722 break; 723 case BITS_STOP_1_5: 724 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__); 725 bits &= ~BITS_STOP_MASK; 726 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 727 break; 728 case BITS_STOP_2: 729 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 730 cflag |= CSTOPB; 731 break; 732 default: 733 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__); 734 bits &= ~BITS_STOP_MASK; 735 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 736 break; 737 } 738 739 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16); 740 if (modem_ctl[0] & 0x0008) { 741 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 742 cflag |= CRTSCTS; 743 } else { 744 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 745 cflag &= ~CRTSCTS; 746 } 747 748 *cflagp = cflag; 749 } 750 751 /* 752 * CP2101 supports the following baud rates: 753 * 754 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 755 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 756 * 757 * CP2102 and CP2103 support the following additional rates: 758 * 759 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 760 * 576000 761 * 762 * The device will map a requested rate to a supported one, but the result 763 * of requests for rates greater than 1053257 is undefined (see AN205). 764 * 765 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 766 * respectively, with an error less than 1%. The actual rates are determined 767 * by 768 * 769 * div = round(freq / (2 x prescale x request)) 770 * actual = freq / (2 x prescale x div) 771 * 772 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 773 * or 1 otherwise. 774 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 775 * otherwise. 776 */ 777 static void cp210x_change_speed(struct tty_struct *tty, 778 struct usb_serial_port *port, struct ktermios *old_termios) 779 { 780 u32 baud; 781 782 baud = tty->termios.c_ospeed; 783 784 /* This maps the requested rate to a rate valid on cp2102 or cp2103, 785 * or to an arbitrary rate in [1M,2M]. 786 * 787 * NOTE: B0 is not implemented. 788 */ 789 baud = cp210x_quantise_baudrate(baud); 790 791 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 792 if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud, 793 sizeof(baud))) { 794 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 795 if (old_termios) 796 baud = old_termios->c_ospeed; 797 else 798 baud = 9600; 799 } 800 801 tty_encode_baud_rate(tty, baud, baud); 802 } 803 804 static void cp210x_set_termios(struct tty_struct *tty, 805 struct usb_serial_port *port, struct ktermios *old_termios) 806 { 807 struct device *dev = &port->dev; 808 unsigned int cflag, old_cflag; 809 unsigned int bits; 810 unsigned int modem_ctl[4]; 811 812 cflag = tty->termios.c_cflag; 813 old_cflag = old_termios->c_cflag; 814 815 if (tty->termios.c_ospeed != old_termios->c_ospeed) 816 cp210x_change_speed(tty, port, old_termios); 817 818 /* If the number of data bits is to be updated */ 819 if ((cflag & CSIZE) != (old_cflag & CSIZE)) { 820 cp210x_get_line_ctl(port, &bits); 821 bits &= ~BITS_DATA_MASK; 822 switch (cflag & CSIZE) { 823 case CS5: 824 bits |= BITS_DATA_5; 825 dev_dbg(dev, "%s - data bits = 5\n", __func__); 826 break; 827 case CS6: 828 bits |= BITS_DATA_6; 829 dev_dbg(dev, "%s - data bits = 6\n", __func__); 830 break; 831 case CS7: 832 bits |= BITS_DATA_7; 833 dev_dbg(dev, "%s - data bits = 7\n", __func__); 834 break; 835 case CS8: 836 bits |= BITS_DATA_8; 837 dev_dbg(dev, "%s - data bits = 8\n", __func__); 838 break; 839 /*case CS9: 840 bits |= BITS_DATA_9; 841 dev_dbg(dev, "%s - data bits = 9\n", __func__); 842 break;*/ 843 default: 844 dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n"); 845 bits |= BITS_DATA_8; 846 break; 847 } 848 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 849 dev_dbg(dev, "Number of data bits requested not supported by device\n"); 850 } 851 852 if ((cflag & (PARENB|PARODD|CMSPAR)) != 853 (old_cflag & (PARENB|PARODD|CMSPAR))) { 854 cp210x_get_line_ctl(port, &bits); 855 bits &= ~BITS_PARITY_MASK; 856 if (cflag & PARENB) { 857 if (cflag & CMSPAR) { 858 if (cflag & PARODD) { 859 bits |= BITS_PARITY_MARK; 860 dev_dbg(dev, "%s - parity = MARK\n", __func__); 861 } else { 862 bits |= BITS_PARITY_SPACE; 863 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 864 } 865 } else { 866 if (cflag & PARODD) { 867 bits |= BITS_PARITY_ODD; 868 dev_dbg(dev, "%s - parity = ODD\n", __func__); 869 } else { 870 bits |= BITS_PARITY_EVEN; 871 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 872 } 873 } 874 } 875 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 876 dev_dbg(dev, "Parity mode not supported by device\n"); 877 } 878 879 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { 880 cp210x_get_line_ctl(port, &bits); 881 bits &= ~BITS_STOP_MASK; 882 if (cflag & CSTOPB) { 883 bits |= BITS_STOP_2; 884 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 885 } else { 886 bits |= BITS_STOP_1; 887 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 888 } 889 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 890 dev_dbg(dev, "Number of stop bits requested not supported by device\n"); 891 } 892 893 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 894 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16); 895 dev_dbg(dev, "%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n", 896 __func__, modem_ctl[0], modem_ctl[1], 897 modem_ctl[2], modem_ctl[3]); 898 899 if (cflag & CRTSCTS) { 900 modem_ctl[0] &= ~0x7B; 901 modem_ctl[0] |= 0x09; 902 modem_ctl[1] = 0x80; 903 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 904 } else { 905 modem_ctl[0] &= ~0x7B; 906 modem_ctl[0] |= 0x01; 907 modem_ctl[1] |= 0x40; 908 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 909 } 910 911 dev_dbg(dev, "%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n", 912 __func__, modem_ctl[0], modem_ctl[1], 913 modem_ctl[2], modem_ctl[3]); 914 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16); 915 } 916 917 } 918 919 static int cp210x_tiocmset(struct tty_struct *tty, 920 unsigned int set, unsigned int clear) 921 { 922 struct usb_serial_port *port = tty->driver_data; 923 return cp210x_tiocmset_port(port, set, clear); 924 } 925 926 static int cp210x_tiocmset_port(struct usb_serial_port *port, 927 unsigned int set, unsigned int clear) 928 { 929 unsigned int control = 0; 930 931 if (set & TIOCM_RTS) { 932 control |= CONTROL_RTS; 933 control |= CONTROL_WRITE_RTS; 934 } 935 if (set & TIOCM_DTR) { 936 control |= CONTROL_DTR; 937 control |= CONTROL_WRITE_DTR; 938 } 939 if (clear & TIOCM_RTS) { 940 control &= ~CONTROL_RTS; 941 control |= CONTROL_WRITE_RTS; 942 } 943 if (clear & TIOCM_DTR) { 944 control &= ~CONTROL_DTR; 945 control |= CONTROL_WRITE_DTR; 946 } 947 948 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control); 949 950 return cp210x_set_config(port, CP210X_SET_MHS, &control, 2); 951 } 952 953 static void cp210x_dtr_rts(struct usb_serial_port *p, int on) 954 { 955 if (on) 956 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0); 957 else 958 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS); 959 } 960 961 static int cp210x_tiocmget(struct tty_struct *tty) 962 { 963 struct usb_serial_port *port = tty->driver_data; 964 unsigned int control; 965 int result; 966 967 cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1); 968 969 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 970 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 971 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 972 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 973 |((control & CONTROL_RING)? TIOCM_RI : 0) 974 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 975 976 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control); 977 978 return result; 979 } 980 981 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 982 { 983 struct usb_serial_port *port = tty->driver_data; 984 unsigned int state; 985 986 if (break_state == 0) 987 state = BREAK_OFF; 988 else 989 state = BREAK_ON; 990 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 991 state == BREAK_OFF ? "off" : "on"); 992 cp210x_set_config(port, CP210X_SET_BREAK, &state, 2); 993 } 994 995 static int cp210x_port_probe(struct usb_serial_port *port) 996 { 997 struct usb_serial *serial = port->serial; 998 struct usb_host_interface *cur_altsetting; 999 struct cp210x_port_private *port_priv; 1000 int ret; 1001 1002 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 1003 if (!port_priv) 1004 return -ENOMEM; 1005 1006 cur_altsetting = serial->interface->cur_altsetting; 1007 port_priv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber; 1008 1009 usb_set_serial_port_data(port, port_priv); 1010 1011 ret = cp210x_detect_swapped_line_ctl(port); 1012 if (ret) { 1013 kfree(port_priv); 1014 return ret; 1015 } 1016 1017 return 0; 1018 } 1019 1020 static int cp210x_port_remove(struct usb_serial_port *port) 1021 { 1022 struct cp210x_port_private *port_priv; 1023 1024 port_priv = usb_get_serial_port_data(port); 1025 kfree(port_priv); 1026 1027 return 0; 1028 } 1029 1030 module_usb_serial_driver(serial_drivers, id_table); 1031 1032 MODULE_DESCRIPTION(DRIVER_DESC); 1033 MODULE_LICENSE("GPL"); 1034