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(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */ 167 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */ 168 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */ 169 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */ 170 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */ 171 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 172 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */ 173 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 174 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 175 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 176 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 177 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 178 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 179 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 180 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 181 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 182 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 183 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 184 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 185 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 186 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 187 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 188 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 189 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 190 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 191 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 192 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 193 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 194 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */ 195 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 196 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 197 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 198 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 199 { } /* Terminating Entry */ 200 }; 201 202 MODULE_DEVICE_TABLE(usb, id_table); 203 204 struct cp210x_port_private { 205 __u8 bInterfaceNumber; 206 bool has_swapped_line_ctl; 207 }; 208 209 static struct usb_serial_driver cp210x_device = { 210 .driver = { 211 .owner = THIS_MODULE, 212 .name = "cp210x", 213 }, 214 .id_table = id_table, 215 .num_ports = 1, 216 .bulk_in_size = 256, 217 .bulk_out_size = 256, 218 .open = cp210x_open, 219 .close = cp210x_close, 220 .break_ctl = cp210x_break_ctl, 221 .set_termios = cp210x_set_termios, 222 .tx_empty = cp210x_tx_empty, 223 .tiocmget = cp210x_tiocmget, 224 .tiocmset = cp210x_tiocmset, 225 .port_probe = cp210x_port_probe, 226 .port_remove = cp210x_port_remove, 227 .dtr_rts = cp210x_dtr_rts 228 }; 229 230 static struct usb_serial_driver * const serial_drivers[] = { 231 &cp210x_device, NULL 232 }; 233 234 /* Config request types */ 235 #define REQTYPE_HOST_TO_INTERFACE 0x41 236 #define REQTYPE_INTERFACE_TO_HOST 0xc1 237 #define REQTYPE_HOST_TO_DEVICE 0x40 238 #define REQTYPE_DEVICE_TO_HOST 0xc0 239 240 /* Config request codes */ 241 #define CP210X_IFC_ENABLE 0x00 242 #define CP210X_SET_BAUDDIV 0x01 243 #define CP210X_GET_BAUDDIV 0x02 244 #define CP210X_SET_LINE_CTL 0x03 245 #define CP210X_GET_LINE_CTL 0x04 246 #define CP210X_SET_BREAK 0x05 247 #define CP210X_IMM_CHAR 0x06 248 #define CP210X_SET_MHS 0x07 249 #define CP210X_GET_MDMSTS 0x08 250 #define CP210X_SET_XON 0x09 251 #define CP210X_SET_XOFF 0x0A 252 #define CP210X_SET_EVENTMASK 0x0B 253 #define CP210X_GET_EVENTMASK 0x0C 254 #define CP210X_SET_CHAR 0x0D 255 #define CP210X_GET_CHARS 0x0E 256 #define CP210X_GET_PROPS 0x0F 257 #define CP210X_GET_COMM_STATUS 0x10 258 #define CP210X_RESET 0x11 259 #define CP210X_PURGE 0x12 260 #define CP210X_SET_FLOW 0x13 261 #define CP210X_GET_FLOW 0x14 262 #define CP210X_EMBED_EVENTS 0x15 263 #define CP210X_GET_EVENTSTATE 0x16 264 #define CP210X_SET_CHARS 0x19 265 #define CP210X_GET_BAUDRATE 0x1D 266 #define CP210X_SET_BAUDRATE 0x1E 267 268 /* CP210X_IFC_ENABLE */ 269 #define UART_ENABLE 0x0001 270 #define UART_DISABLE 0x0000 271 272 /* CP210X_(SET|GET)_BAUDDIV */ 273 #define BAUD_RATE_GEN_FREQ 0x384000 274 275 /* CP210X_(SET|GET)_LINE_CTL */ 276 #define BITS_DATA_MASK 0X0f00 277 #define BITS_DATA_5 0X0500 278 #define BITS_DATA_6 0X0600 279 #define BITS_DATA_7 0X0700 280 #define BITS_DATA_8 0X0800 281 #define BITS_DATA_9 0X0900 282 283 #define BITS_PARITY_MASK 0x00f0 284 #define BITS_PARITY_NONE 0x0000 285 #define BITS_PARITY_ODD 0x0010 286 #define BITS_PARITY_EVEN 0x0020 287 #define BITS_PARITY_MARK 0x0030 288 #define BITS_PARITY_SPACE 0x0040 289 290 #define BITS_STOP_MASK 0x000f 291 #define BITS_STOP_1 0x0000 292 #define BITS_STOP_1_5 0x0001 293 #define BITS_STOP_2 0x0002 294 295 /* CP210X_SET_BREAK */ 296 #define BREAK_ON 0x0001 297 #define BREAK_OFF 0x0000 298 299 /* CP210X_(SET_MHS|GET_MDMSTS) */ 300 #define CONTROL_DTR 0x0001 301 #define CONTROL_RTS 0x0002 302 #define CONTROL_CTS 0x0010 303 #define CONTROL_DSR 0x0020 304 #define CONTROL_RING 0x0040 305 #define CONTROL_DCD 0x0080 306 #define CONTROL_WRITE_DTR 0x0100 307 #define CONTROL_WRITE_RTS 0x0200 308 309 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 310 struct cp210x_comm_status { 311 __le32 ulErrors; 312 __le32 ulHoldReasons; 313 __le32 ulAmountInInQueue; 314 __le32 ulAmountInOutQueue; 315 u8 bEofReceived; 316 u8 bWaitForImmediate; 317 u8 bReserved; 318 } __packed; 319 320 /* 321 * CP210X_PURGE - 16 bits passed in wValue of USB request. 322 * SiLabs app note AN571 gives a strange description of the 4 bits: 323 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 324 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 325 */ 326 #define PURGE_ALL 0x000f 327 328 /* 329 * cp210x_get_config 330 * Reads from the CP210x configuration registers 331 * 'size' is specified in bytes. 332 * 'data' is a pointer to a pre-allocated array of integers large 333 * enough to hold 'size' bytes (with 4 bytes to each integer) 334 */ 335 static int cp210x_get_config(struct usb_serial_port *port, u8 request, 336 unsigned int *data, int size) 337 { 338 struct usb_serial *serial = port->serial; 339 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 340 __le32 *buf; 341 int result, i, length; 342 343 /* Number of integers required to contain the array */ 344 length = (((size - 1) | 3) + 1) / 4; 345 346 buf = kcalloc(length, sizeof(__le32), GFP_KERNEL); 347 if (!buf) 348 return -ENOMEM; 349 350 /* Issue the request, attempting to read 'size' bytes */ 351 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 352 request, REQTYPE_INTERFACE_TO_HOST, 0x0000, 353 port_priv->bInterfaceNumber, buf, size, 354 USB_CTRL_GET_TIMEOUT); 355 356 /* Convert data into an array of integers */ 357 for (i = 0; i < length; i++) 358 data[i] = le32_to_cpu(buf[i]); 359 360 kfree(buf); 361 362 if (result != size) { 363 dev_dbg(&port->dev, "%s - Unable to send config request, request=0x%x size=%d result=%d\n", 364 __func__, request, size, result); 365 if (result > 0) 366 result = -EPROTO; 367 368 return result; 369 } 370 371 return 0; 372 } 373 374 /* 375 * cp210x_set_config 376 * Writes to the CP210x configuration registers 377 * Values less than 16 bits wide are sent directly 378 * 'size' is specified in bytes. 379 */ 380 static int cp210x_set_config(struct usb_serial_port *port, u8 request, 381 unsigned int *data, int size) 382 { 383 struct usb_serial *serial = port->serial; 384 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 385 __le32 *buf; 386 int result, i, length; 387 388 /* Number of integers required to contain the array */ 389 length = (((size - 1) | 3) + 1) / 4; 390 391 buf = kmalloc(length * sizeof(__le32), GFP_KERNEL); 392 if (!buf) 393 return -ENOMEM; 394 395 /* Array of integers into bytes */ 396 for (i = 0; i < length; i++) 397 buf[i] = cpu_to_le32(data[i]); 398 399 if (size > 2) { 400 result = usb_control_msg(serial->dev, 401 usb_sndctrlpipe(serial->dev, 0), 402 request, REQTYPE_HOST_TO_INTERFACE, 0x0000, 403 port_priv->bInterfaceNumber, buf, size, 404 USB_CTRL_SET_TIMEOUT); 405 } else { 406 result = usb_control_msg(serial->dev, 407 usb_sndctrlpipe(serial->dev, 0), 408 request, REQTYPE_HOST_TO_INTERFACE, data[0], 409 port_priv->bInterfaceNumber, NULL, 0, 410 USB_CTRL_SET_TIMEOUT); 411 } 412 413 kfree(buf); 414 415 if ((size > 2 && result != size) || result < 0) { 416 dev_dbg(&port->dev, "%s - Unable to send request, request=0x%x size=%d result=%d\n", 417 __func__, request, size, result); 418 if (result > 0) 419 result = -EPROTO; 420 421 return result; 422 } 423 424 return 0; 425 } 426 427 /* 428 * cp210x_set_config_single 429 * Convenience function for calling cp210x_set_config on single data values 430 * without requiring an integer pointer 431 */ 432 static inline int cp210x_set_config_single(struct usb_serial_port *port, 433 u8 request, unsigned int data) 434 { 435 return cp210x_set_config(port, request, &data, 2); 436 } 437 438 /* 439 * Detect CP2108 GET_LINE_CTL bug and activate workaround. 440 * Write a known good value 0x800, read it back. 441 * If it comes back swapped the bug is detected. 442 * Preserve the original register value. 443 */ 444 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port) 445 { 446 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 447 unsigned int line_ctl_save; 448 unsigned int line_ctl_test; 449 int err; 450 451 err = cp210x_get_config(port, CP210X_GET_LINE_CTL, &line_ctl_save, 2); 452 if (err) 453 return err; 454 455 line_ctl_test = 0x800; 456 err = cp210x_set_config(port, CP210X_SET_LINE_CTL, &line_ctl_test, 2); 457 if (err) 458 return err; 459 460 err = cp210x_get_config(port, CP210X_GET_LINE_CTL, &line_ctl_test, 2); 461 if (err) 462 return err; 463 464 if (line_ctl_test == 8) { 465 port_priv->has_swapped_line_ctl = true; 466 line_ctl_save = swab16((u16)line_ctl_save); 467 } 468 469 return cp210x_set_config(port, CP210X_SET_LINE_CTL, &line_ctl_save, 2); 470 } 471 472 /* 473 * Must always be called instead of cp210x_get_config(CP210X_GET_LINE_CTL) 474 * to workaround cp2108 bug and get correct value. 475 */ 476 static int cp210x_get_line_ctl(struct usb_serial_port *port, unsigned int *ctl) 477 { 478 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 479 int err; 480 481 err = cp210x_get_config(port, CP210X_GET_LINE_CTL, ctl, 2); 482 if (err) 483 return err; 484 485 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */ 486 if (port_priv->has_swapped_line_ctl) 487 *ctl = swab16((u16)(*ctl)); 488 489 return 0; 490 } 491 492 /* 493 * cp210x_quantise_baudrate 494 * Quantises the baud rate as per AN205 Table 1 495 */ 496 static unsigned int cp210x_quantise_baudrate(unsigned int baud) 497 { 498 if (baud <= 300) 499 baud = 300; 500 else if (baud <= 600) baud = 600; 501 else if (baud <= 1200) baud = 1200; 502 else if (baud <= 1800) baud = 1800; 503 else if (baud <= 2400) baud = 2400; 504 else if (baud <= 4000) baud = 4000; 505 else if (baud <= 4803) baud = 4800; 506 else if (baud <= 7207) baud = 7200; 507 else if (baud <= 9612) baud = 9600; 508 else if (baud <= 14428) baud = 14400; 509 else if (baud <= 16062) baud = 16000; 510 else if (baud <= 19250) baud = 19200; 511 else if (baud <= 28912) baud = 28800; 512 else if (baud <= 38601) baud = 38400; 513 else if (baud <= 51558) baud = 51200; 514 else if (baud <= 56280) baud = 56000; 515 else if (baud <= 58053) baud = 57600; 516 else if (baud <= 64111) baud = 64000; 517 else if (baud <= 77608) baud = 76800; 518 else if (baud <= 117028) baud = 115200; 519 else if (baud <= 129347) baud = 128000; 520 else if (baud <= 156868) baud = 153600; 521 else if (baud <= 237832) baud = 230400; 522 else if (baud <= 254234) baud = 250000; 523 else if (baud <= 273066) baud = 256000; 524 else if (baud <= 491520) baud = 460800; 525 else if (baud <= 567138) baud = 500000; 526 else if (baud <= 670254) baud = 576000; 527 else if (baud < 1000000) 528 baud = 921600; 529 else if (baud > 2000000) 530 baud = 2000000; 531 return baud; 532 } 533 534 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 535 { 536 int result; 537 538 result = cp210x_set_config_single(port, CP210X_IFC_ENABLE, 539 UART_ENABLE); 540 if (result) { 541 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 542 return result; 543 } 544 545 /* Configure the termios structure */ 546 cp210x_get_termios(tty, port); 547 548 /* The baud rate must be initialised on cp2104 */ 549 if (tty) 550 cp210x_change_speed(tty, port, NULL); 551 552 return usb_serial_generic_open(tty, port); 553 } 554 555 static void cp210x_close(struct usb_serial_port *port) 556 { 557 unsigned int purge_ctl; 558 559 usb_serial_generic_close(port); 560 561 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 562 purge_ctl = PURGE_ALL; 563 cp210x_set_config(port, CP210X_PURGE, &purge_ctl, 2); 564 565 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE); 566 } 567 568 /* 569 * Read how many bytes are waiting in the TX queue. 570 */ 571 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 572 u32 *count) 573 { 574 struct usb_serial *serial = port->serial; 575 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 576 struct cp210x_comm_status *sts; 577 int result; 578 579 sts = kmalloc(sizeof(*sts), GFP_KERNEL); 580 if (!sts) 581 return -ENOMEM; 582 583 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 584 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST, 585 0, port_priv->bInterfaceNumber, sts, sizeof(*sts), 586 USB_CTRL_GET_TIMEOUT); 587 if (result == sizeof(*sts)) { 588 *count = le32_to_cpu(sts->ulAmountInOutQueue); 589 result = 0; 590 } else { 591 dev_err(&port->dev, "failed to get comm status: %d\n", result); 592 if (result >= 0) 593 result = -EPROTO; 594 } 595 596 kfree(sts); 597 598 return result; 599 } 600 601 static bool cp210x_tx_empty(struct usb_serial_port *port) 602 { 603 int err; 604 u32 count; 605 606 err = cp210x_get_tx_queue_byte_count(port, &count); 607 if (err) 608 return true; 609 610 return !count; 611 } 612 613 /* 614 * cp210x_get_termios 615 * Reads the baud rate, data bits, parity, stop bits and flow control mode 616 * from the device, corrects any unsupported values, and configures the 617 * termios structure to reflect the state of the device 618 */ 619 static void cp210x_get_termios(struct tty_struct *tty, 620 struct usb_serial_port *port) 621 { 622 unsigned int baud; 623 624 if (tty) { 625 cp210x_get_termios_port(tty->driver_data, 626 &tty->termios.c_cflag, &baud); 627 tty_encode_baud_rate(tty, baud, baud); 628 } else { 629 unsigned int cflag; 630 cflag = 0; 631 cp210x_get_termios_port(port, &cflag, &baud); 632 } 633 } 634 635 /* 636 * cp210x_get_termios_port 637 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port. 638 */ 639 static void cp210x_get_termios_port(struct usb_serial_port *port, 640 unsigned int *cflagp, unsigned int *baudp) 641 { 642 struct device *dev = &port->dev; 643 unsigned int cflag, modem_ctl[4]; 644 unsigned int baud; 645 unsigned int bits; 646 647 cp210x_get_config(port, CP210X_GET_BAUDRATE, &baud, 4); 648 649 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud); 650 *baudp = baud; 651 652 cflag = *cflagp; 653 654 cp210x_get_line_ctl(port, &bits); 655 cflag &= ~CSIZE; 656 switch (bits & BITS_DATA_MASK) { 657 case BITS_DATA_5: 658 dev_dbg(dev, "%s - data bits = 5\n", __func__); 659 cflag |= CS5; 660 break; 661 case BITS_DATA_6: 662 dev_dbg(dev, "%s - data bits = 6\n", __func__); 663 cflag |= CS6; 664 break; 665 case BITS_DATA_7: 666 dev_dbg(dev, "%s - data bits = 7\n", __func__); 667 cflag |= CS7; 668 break; 669 case BITS_DATA_8: 670 dev_dbg(dev, "%s - data bits = 8\n", __func__); 671 cflag |= CS8; 672 break; 673 case BITS_DATA_9: 674 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__); 675 cflag |= CS8; 676 bits &= ~BITS_DATA_MASK; 677 bits |= BITS_DATA_8; 678 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 679 break; 680 default: 681 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__); 682 cflag |= CS8; 683 bits &= ~BITS_DATA_MASK; 684 bits |= BITS_DATA_8; 685 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 686 break; 687 } 688 689 switch (bits & BITS_PARITY_MASK) { 690 case BITS_PARITY_NONE: 691 dev_dbg(dev, "%s - parity = NONE\n", __func__); 692 cflag &= ~PARENB; 693 break; 694 case BITS_PARITY_ODD: 695 dev_dbg(dev, "%s - parity = ODD\n", __func__); 696 cflag |= (PARENB|PARODD); 697 break; 698 case BITS_PARITY_EVEN: 699 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 700 cflag &= ~PARODD; 701 cflag |= PARENB; 702 break; 703 case BITS_PARITY_MARK: 704 dev_dbg(dev, "%s - parity = MARK\n", __func__); 705 cflag |= (PARENB|PARODD|CMSPAR); 706 break; 707 case BITS_PARITY_SPACE: 708 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 709 cflag &= ~PARODD; 710 cflag |= (PARENB|CMSPAR); 711 break; 712 default: 713 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__); 714 cflag &= ~PARENB; 715 bits &= ~BITS_PARITY_MASK; 716 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 717 break; 718 } 719 720 cflag &= ~CSTOPB; 721 switch (bits & BITS_STOP_MASK) { 722 case BITS_STOP_1: 723 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 724 break; 725 case BITS_STOP_1_5: 726 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__); 727 bits &= ~BITS_STOP_MASK; 728 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 729 break; 730 case BITS_STOP_2: 731 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 732 cflag |= CSTOPB; 733 break; 734 default: 735 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__); 736 bits &= ~BITS_STOP_MASK; 737 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 738 break; 739 } 740 741 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16); 742 if (modem_ctl[0] & 0x0008) { 743 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 744 cflag |= CRTSCTS; 745 } else { 746 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 747 cflag &= ~CRTSCTS; 748 } 749 750 *cflagp = cflag; 751 } 752 753 /* 754 * CP2101 supports the following baud rates: 755 * 756 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 757 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 758 * 759 * CP2102 and CP2103 support the following additional rates: 760 * 761 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 762 * 576000 763 * 764 * The device will map a requested rate to a supported one, but the result 765 * of requests for rates greater than 1053257 is undefined (see AN205). 766 * 767 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 768 * respectively, with an error less than 1%. The actual rates are determined 769 * by 770 * 771 * div = round(freq / (2 x prescale x request)) 772 * actual = freq / (2 x prescale x div) 773 * 774 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 775 * or 1 otherwise. 776 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 777 * otherwise. 778 */ 779 static void cp210x_change_speed(struct tty_struct *tty, 780 struct usb_serial_port *port, struct ktermios *old_termios) 781 { 782 u32 baud; 783 784 baud = tty->termios.c_ospeed; 785 786 /* This maps the requested rate to a rate valid on cp2102 or cp2103, 787 * or to an arbitrary rate in [1M,2M]. 788 * 789 * NOTE: B0 is not implemented. 790 */ 791 baud = cp210x_quantise_baudrate(baud); 792 793 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 794 if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud, 795 sizeof(baud))) { 796 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 797 if (old_termios) 798 baud = old_termios->c_ospeed; 799 else 800 baud = 9600; 801 } 802 803 tty_encode_baud_rate(tty, baud, baud); 804 } 805 806 static void cp210x_set_termios(struct tty_struct *tty, 807 struct usb_serial_port *port, struct ktermios *old_termios) 808 { 809 struct device *dev = &port->dev; 810 unsigned int cflag, old_cflag; 811 unsigned int bits; 812 unsigned int modem_ctl[4]; 813 814 cflag = tty->termios.c_cflag; 815 old_cflag = old_termios->c_cflag; 816 817 if (tty->termios.c_ospeed != old_termios->c_ospeed) 818 cp210x_change_speed(tty, port, old_termios); 819 820 /* If the number of data bits is to be updated */ 821 if ((cflag & CSIZE) != (old_cflag & CSIZE)) { 822 cp210x_get_line_ctl(port, &bits); 823 bits &= ~BITS_DATA_MASK; 824 switch (cflag & CSIZE) { 825 case CS5: 826 bits |= BITS_DATA_5; 827 dev_dbg(dev, "%s - data bits = 5\n", __func__); 828 break; 829 case CS6: 830 bits |= BITS_DATA_6; 831 dev_dbg(dev, "%s - data bits = 6\n", __func__); 832 break; 833 case CS7: 834 bits |= BITS_DATA_7; 835 dev_dbg(dev, "%s - data bits = 7\n", __func__); 836 break; 837 case CS8: 838 bits |= BITS_DATA_8; 839 dev_dbg(dev, "%s - data bits = 8\n", __func__); 840 break; 841 /*case CS9: 842 bits |= BITS_DATA_9; 843 dev_dbg(dev, "%s - data bits = 9\n", __func__); 844 break;*/ 845 default: 846 dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n"); 847 bits |= BITS_DATA_8; 848 break; 849 } 850 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 851 dev_dbg(dev, "Number of data bits requested not supported by device\n"); 852 } 853 854 if ((cflag & (PARENB|PARODD|CMSPAR)) != 855 (old_cflag & (PARENB|PARODD|CMSPAR))) { 856 cp210x_get_line_ctl(port, &bits); 857 bits &= ~BITS_PARITY_MASK; 858 if (cflag & PARENB) { 859 if (cflag & CMSPAR) { 860 if (cflag & PARODD) { 861 bits |= BITS_PARITY_MARK; 862 dev_dbg(dev, "%s - parity = MARK\n", __func__); 863 } else { 864 bits |= BITS_PARITY_SPACE; 865 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 866 } 867 } else { 868 if (cflag & PARODD) { 869 bits |= BITS_PARITY_ODD; 870 dev_dbg(dev, "%s - parity = ODD\n", __func__); 871 } else { 872 bits |= BITS_PARITY_EVEN; 873 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 874 } 875 } 876 } 877 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 878 dev_dbg(dev, "Parity mode not supported by device\n"); 879 } 880 881 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { 882 cp210x_get_line_ctl(port, &bits); 883 bits &= ~BITS_STOP_MASK; 884 if (cflag & CSTOPB) { 885 bits |= BITS_STOP_2; 886 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 887 } else { 888 bits |= BITS_STOP_1; 889 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 890 } 891 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 892 dev_dbg(dev, "Number of stop bits requested not supported by device\n"); 893 } 894 895 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 896 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16); 897 dev_dbg(dev, "%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n", 898 __func__, modem_ctl[0], modem_ctl[1], 899 modem_ctl[2], modem_ctl[3]); 900 901 if (cflag & CRTSCTS) { 902 modem_ctl[0] &= ~0x7B; 903 modem_ctl[0] |= 0x09; 904 modem_ctl[1] = 0x80; 905 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 906 } else { 907 modem_ctl[0] &= ~0x7B; 908 modem_ctl[0] |= 0x01; 909 modem_ctl[1] |= 0x40; 910 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 911 } 912 913 dev_dbg(dev, "%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n", 914 __func__, modem_ctl[0], modem_ctl[1], 915 modem_ctl[2], modem_ctl[3]); 916 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16); 917 } 918 919 } 920 921 static int cp210x_tiocmset(struct tty_struct *tty, 922 unsigned int set, unsigned int clear) 923 { 924 struct usb_serial_port *port = tty->driver_data; 925 return cp210x_tiocmset_port(port, set, clear); 926 } 927 928 static int cp210x_tiocmset_port(struct usb_serial_port *port, 929 unsigned int set, unsigned int clear) 930 { 931 unsigned int control = 0; 932 933 if (set & TIOCM_RTS) { 934 control |= CONTROL_RTS; 935 control |= CONTROL_WRITE_RTS; 936 } 937 if (set & TIOCM_DTR) { 938 control |= CONTROL_DTR; 939 control |= CONTROL_WRITE_DTR; 940 } 941 if (clear & TIOCM_RTS) { 942 control &= ~CONTROL_RTS; 943 control |= CONTROL_WRITE_RTS; 944 } 945 if (clear & TIOCM_DTR) { 946 control &= ~CONTROL_DTR; 947 control |= CONTROL_WRITE_DTR; 948 } 949 950 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control); 951 952 return cp210x_set_config(port, CP210X_SET_MHS, &control, 2); 953 } 954 955 static void cp210x_dtr_rts(struct usb_serial_port *p, int on) 956 { 957 if (on) 958 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0); 959 else 960 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS); 961 } 962 963 static int cp210x_tiocmget(struct tty_struct *tty) 964 { 965 struct usb_serial_port *port = tty->driver_data; 966 unsigned int control; 967 int result; 968 969 cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1); 970 971 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 972 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 973 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 974 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 975 |((control & CONTROL_RING)? TIOCM_RI : 0) 976 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 977 978 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control); 979 980 return result; 981 } 982 983 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 984 { 985 struct usb_serial_port *port = tty->driver_data; 986 unsigned int state; 987 988 if (break_state == 0) 989 state = BREAK_OFF; 990 else 991 state = BREAK_ON; 992 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 993 state == BREAK_OFF ? "off" : "on"); 994 cp210x_set_config(port, CP210X_SET_BREAK, &state, 2); 995 } 996 997 static int cp210x_port_probe(struct usb_serial_port *port) 998 { 999 struct usb_serial *serial = port->serial; 1000 struct usb_host_interface *cur_altsetting; 1001 struct cp210x_port_private *port_priv; 1002 int ret; 1003 1004 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 1005 if (!port_priv) 1006 return -ENOMEM; 1007 1008 cur_altsetting = serial->interface->cur_altsetting; 1009 port_priv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber; 1010 1011 usb_set_serial_port_data(port, port_priv); 1012 1013 ret = cp210x_detect_swapped_line_ctl(port); 1014 if (ret) { 1015 kfree(port_priv); 1016 return ret; 1017 } 1018 1019 return 0; 1020 } 1021 1022 static int cp210x_port_remove(struct usb_serial_port *port) 1023 { 1024 struct cp210x_port_private *port_priv; 1025 1026 port_priv = usb_get_serial_port_data(port); 1027 kfree(port_priv); 1028 1029 return 0; 1030 } 1031 1032 module_usb_serial_driver(serial_drivers, id_table); 1033 1034 MODULE_DESCRIPTION(DRIVER_DESC); 1035 MODULE_LICENSE("GPL"); 1036