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(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */ 169 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */ 170 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */ 171 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */ 172 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */ 173 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 174 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */ 175 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 176 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 177 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 178 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 179 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 180 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 181 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 182 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 183 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 184 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 185 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 186 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 187 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 188 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 189 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 190 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 191 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 192 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 193 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 194 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 195 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 196 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */ 197 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 198 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 199 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 200 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 201 { } /* Terminating Entry */ 202 }; 203 204 MODULE_DEVICE_TABLE(usb, id_table); 205 206 struct cp210x_port_private { 207 __u8 bInterfaceNumber; 208 bool has_swapped_line_ctl; 209 }; 210 211 static struct usb_serial_driver cp210x_device = { 212 .driver = { 213 .owner = THIS_MODULE, 214 .name = "cp210x", 215 }, 216 .id_table = id_table, 217 .num_ports = 1, 218 .bulk_in_size = 256, 219 .bulk_out_size = 256, 220 .open = cp210x_open, 221 .close = cp210x_close, 222 .break_ctl = cp210x_break_ctl, 223 .set_termios = cp210x_set_termios, 224 .tx_empty = cp210x_tx_empty, 225 .tiocmget = cp210x_tiocmget, 226 .tiocmset = cp210x_tiocmset, 227 .port_probe = cp210x_port_probe, 228 .port_remove = cp210x_port_remove, 229 .dtr_rts = cp210x_dtr_rts 230 }; 231 232 static struct usb_serial_driver * const serial_drivers[] = { 233 &cp210x_device, NULL 234 }; 235 236 /* Config request types */ 237 #define REQTYPE_HOST_TO_INTERFACE 0x41 238 #define REQTYPE_INTERFACE_TO_HOST 0xc1 239 #define REQTYPE_HOST_TO_DEVICE 0x40 240 #define REQTYPE_DEVICE_TO_HOST 0xc0 241 242 /* Config request codes */ 243 #define CP210X_IFC_ENABLE 0x00 244 #define CP210X_SET_BAUDDIV 0x01 245 #define CP210X_GET_BAUDDIV 0x02 246 #define CP210X_SET_LINE_CTL 0x03 247 #define CP210X_GET_LINE_CTL 0x04 248 #define CP210X_SET_BREAK 0x05 249 #define CP210X_IMM_CHAR 0x06 250 #define CP210X_SET_MHS 0x07 251 #define CP210X_GET_MDMSTS 0x08 252 #define CP210X_SET_XON 0x09 253 #define CP210X_SET_XOFF 0x0A 254 #define CP210X_SET_EVENTMASK 0x0B 255 #define CP210X_GET_EVENTMASK 0x0C 256 #define CP210X_SET_CHAR 0x0D 257 #define CP210X_GET_CHARS 0x0E 258 #define CP210X_GET_PROPS 0x0F 259 #define CP210X_GET_COMM_STATUS 0x10 260 #define CP210X_RESET 0x11 261 #define CP210X_PURGE 0x12 262 #define CP210X_SET_FLOW 0x13 263 #define CP210X_GET_FLOW 0x14 264 #define CP210X_EMBED_EVENTS 0x15 265 #define CP210X_GET_EVENTSTATE 0x16 266 #define CP210X_SET_CHARS 0x19 267 #define CP210X_GET_BAUDRATE 0x1D 268 #define CP210X_SET_BAUDRATE 0x1E 269 270 /* CP210X_IFC_ENABLE */ 271 #define UART_ENABLE 0x0001 272 #define UART_DISABLE 0x0000 273 274 /* CP210X_(SET|GET)_BAUDDIV */ 275 #define BAUD_RATE_GEN_FREQ 0x384000 276 277 /* CP210X_(SET|GET)_LINE_CTL */ 278 #define BITS_DATA_MASK 0X0f00 279 #define BITS_DATA_5 0X0500 280 #define BITS_DATA_6 0X0600 281 #define BITS_DATA_7 0X0700 282 #define BITS_DATA_8 0X0800 283 #define BITS_DATA_9 0X0900 284 285 #define BITS_PARITY_MASK 0x00f0 286 #define BITS_PARITY_NONE 0x0000 287 #define BITS_PARITY_ODD 0x0010 288 #define BITS_PARITY_EVEN 0x0020 289 #define BITS_PARITY_MARK 0x0030 290 #define BITS_PARITY_SPACE 0x0040 291 292 #define BITS_STOP_MASK 0x000f 293 #define BITS_STOP_1 0x0000 294 #define BITS_STOP_1_5 0x0001 295 #define BITS_STOP_2 0x0002 296 297 /* CP210X_SET_BREAK */ 298 #define BREAK_ON 0x0001 299 #define BREAK_OFF 0x0000 300 301 /* CP210X_(SET_MHS|GET_MDMSTS) */ 302 #define CONTROL_DTR 0x0001 303 #define CONTROL_RTS 0x0002 304 #define CONTROL_CTS 0x0010 305 #define CONTROL_DSR 0x0020 306 #define CONTROL_RING 0x0040 307 #define CONTROL_DCD 0x0080 308 #define CONTROL_WRITE_DTR 0x0100 309 #define CONTROL_WRITE_RTS 0x0200 310 311 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 312 struct cp210x_comm_status { 313 __le32 ulErrors; 314 __le32 ulHoldReasons; 315 __le32 ulAmountInInQueue; 316 __le32 ulAmountInOutQueue; 317 u8 bEofReceived; 318 u8 bWaitForImmediate; 319 u8 bReserved; 320 } __packed; 321 322 /* 323 * CP210X_PURGE - 16 bits passed in wValue of USB request. 324 * SiLabs app note AN571 gives a strange description of the 4 bits: 325 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 326 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 327 */ 328 #define PURGE_ALL 0x000f 329 330 /* 331 * Reads a variable-sized block of CP210X_ registers, identified by req. 332 * Returns data into buf in native USB byte order. 333 */ 334 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, 335 void *buf, int bufsize) 336 { 337 struct usb_serial *serial = port->serial; 338 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 339 void *dmabuf; 340 int result; 341 342 dmabuf = kmalloc(bufsize, GFP_KERNEL); 343 if (!dmabuf) { 344 /* 345 * FIXME Some callers don't bother to check for error, 346 * at least give them consistent junk until they are fixed 347 */ 348 memset(buf, 0, bufsize); 349 return -ENOMEM; 350 } 351 352 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 353 req, REQTYPE_INTERFACE_TO_HOST, 0, 354 port_priv->bInterfaceNumber, dmabuf, bufsize, 355 USB_CTRL_SET_TIMEOUT); 356 if (result == bufsize) { 357 memcpy(buf, dmabuf, bufsize); 358 result = 0; 359 } else { 360 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", 361 req, bufsize, result); 362 if (result >= 0) 363 result = -EPROTO; 364 365 /* 366 * FIXME Some callers don't bother to check for error, 367 * at least give them consistent junk until they are fixed 368 */ 369 memset(buf, 0, bufsize); 370 } 371 372 kfree(dmabuf); 373 374 return result; 375 } 376 377 /* 378 * Reads any 32-bit CP210X_ register identified by req. 379 */ 380 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val) 381 { 382 __le32 le32_val; 383 int err; 384 385 err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val)); 386 if (err) { 387 /* 388 * FIXME Some callers don't bother to check for error, 389 * at least give them consistent junk until they are fixed 390 */ 391 *val = 0; 392 return err; 393 } 394 395 *val = le32_to_cpu(le32_val); 396 397 return 0; 398 } 399 400 /* 401 * Reads any 16-bit CP210X_ register identified by req. 402 */ 403 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val) 404 { 405 __le16 le16_val; 406 int err; 407 408 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val)); 409 if (err) 410 return err; 411 412 *val = le16_to_cpu(le16_val); 413 414 return 0; 415 } 416 417 /* 418 * Reads any 8-bit CP210X_ register identified by req. 419 */ 420 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val) 421 { 422 return cp210x_read_reg_block(port, req, val, sizeof(*val)); 423 } 424 425 /* 426 * Writes any 16-bit CP210X_ register (req) whose value is passed 427 * entirely in the wValue field of the USB request. 428 */ 429 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) 430 { 431 struct usb_serial *serial = port->serial; 432 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 433 int result; 434 435 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 436 req, REQTYPE_HOST_TO_INTERFACE, val, 437 port_priv->bInterfaceNumber, NULL, 0, 438 USB_CTRL_SET_TIMEOUT); 439 if (result < 0) { 440 dev_err(&port->dev, "failed set request 0x%x status: %d\n", 441 req, result); 442 } 443 444 return result; 445 } 446 447 /* 448 * Writes a variable-sized block of CP210X_ registers, identified by req. 449 * Data in buf must be in native USB byte order. 450 */ 451 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req, 452 void *buf, int bufsize) 453 { 454 struct usb_serial *serial = port->serial; 455 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 456 void *dmabuf; 457 int result; 458 459 dmabuf = kmalloc(bufsize, GFP_KERNEL); 460 if (!dmabuf) 461 return -ENOMEM; 462 463 memcpy(dmabuf, buf, bufsize); 464 465 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 466 req, REQTYPE_HOST_TO_INTERFACE, 0, 467 port_priv->bInterfaceNumber, dmabuf, bufsize, 468 USB_CTRL_SET_TIMEOUT); 469 470 kfree(dmabuf); 471 472 if (result == bufsize) { 473 result = 0; 474 } else { 475 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", 476 req, bufsize, result); 477 if (result >= 0) 478 result = -EPROTO; 479 } 480 481 return result; 482 } 483 484 /* 485 * Writes any 32-bit CP210X_ register identified by req. 486 */ 487 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) 488 { 489 __le32 le32_val; 490 491 le32_val = cpu_to_le32(val); 492 493 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); 494 } 495 496 /* 497 * Detect CP2108 GET_LINE_CTL bug and activate workaround. 498 * Write a known good value 0x800, read it back. 499 * If it comes back swapped the bug is detected. 500 * Preserve the original register value. 501 */ 502 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port) 503 { 504 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 505 u16 line_ctl_save; 506 u16 line_ctl_test; 507 int err; 508 509 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save); 510 if (err) 511 return err; 512 513 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800); 514 if (err) 515 return err; 516 517 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test); 518 if (err) 519 return err; 520 521 if (line_ctl_test == 8) { 522 port_priv->has_swapped_line_ctl = true; 523 line_ctl_save = swab16(line_ctl_save); 524 } 525 526 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save); 527 } 528 529 /* 530 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL) 531 * to workaround cp2108 bug and get correct value. 532 */ 533 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl) 534 { 535 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 536 int err; 537 538 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl); 539 if (err) 540 return err; 541 542 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */ 543 if (port_priv->has_swapped_line_ctl) 544 *ctl = swab16(*ctl); 545 546 return 0; 547 } 548 549 /* 550 * cp210x_quantise_baudrate 551 * Quantises the baud rate as per AN205 Table 1 552 */ 553 static unsigned int cp210x_quantise_baudrate(unsigned int baud) 554 { 555 if (baud <= 300) 556 baud = 300; 557 else if (baud <= 600) baud = 600; 558 else if (baud <= 1200) baud = 1200; 559 else if (baud <= 1800) baud = 1800; 560 else if (baud <= 2400) baud = 2400; 561 else if (baud <= 4000) baud = 4000; 562 else if (baud <= 4803) baud = 4800; 563 else if (baud <= 7207) baud = 7200; 564 else if (baud <= 9612) baud = 9600; 565 else if (baud <= 14428) baud = 14400; 566 else if (baud <= 16062) baud = 16000; 567 else if (baud <= 19250) baud = 19200; 568 else if (baud <= 28912) baud = 28800; 569 else if (baud <= 38601) baud = 38400; 570 else if (baud <= 51558) baud = 51200; 571 else if (baud <= 56280) baud = 56000; 572 else if (baud <= 58053) baud = 57600; 573 else if (baud <= 64111) baud = 64000; 574 else if (baud <= 77608) baud = 76800; 575 else if (baud <= 117028) baud = 115200; 576 else if (baud <= 129347) baud = 128000; 577 else if (baud <= 156868) baud = 153600; 578 else if (baud <= 237832) baud = 230400; 579 else if (baud <= 254234) baud = 250000; 580 else if (baud <= 273066) baud = 256000; 581 else if (baud <= 491520) baud = 460800; 582 else if (baud <= 567138) baud = 500000; 583 else if (baud <= 670254) baud = 576000; 584 else if (baud < 1000000) 585 baud = 921600; 586 else if (baud > 2000000) 587 baud = 2000000; 588 return baud; 589 } 590 591 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 592 { 593 int result; 594 595 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 596 if (result) { 597 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 598 return result; 599 } 600 601 /* Configure the termios structure */ 602 cp210x_get_termios(tty, port); 603 604 /* The baud rate must be initialised on cp2104 */ 605 if (tty) 606 cp210x_change_speed(tty, port, NULL); 607 608 return usb_serial_generic_open(tty, port); 609 } 610 611 static void cp210x_close(struct usb_serial_port *port) 612 { 613 usb_serial_generic_close(port); 614 615 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 616 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 617 618 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 619 } 620 621 /* 622 * Read how many bytes are waiting in the TX queue. 623 */ 624 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 625 u32 *count) 626 { 627 struct usb_serial *serial = port->serial; 628 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 629 struct cp210x_comm_status *sts; 630 int result; 631 632 sts = kmalloc(sizeof(*sts), GFP_KERNEL); 633 if (!sts) 634 return -ENOMEM; 635 636 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 637 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST, 638 0, port_priv->bInterfaceNumber, sts, sizeof(*sts), 639 USB_CTRL_GET_TIMEOUT); 640 if (result == sizeof(*sts)) { 641 *count = le32_to_cpu(sts->ulAmountInOutQueue); 642 result = 0; 643 } else { 644 dev_err(&port->dev, "failed to get comm status: %d\n", result); 645 if (result >= 0) 646 result = -EPROTO; 647 } 648 649 kfree(sts); 650 651 return result; 652 } 653 654 static bool cp210x_tx_empty(struct usb_serial_port *port) 655 { 656 int err; 657 u32 count; 658 659 err = cp210x_get_tx_queue_byte_count(port, &count); 660 if (err) 661 return true; 662 663 return !count; 664 } 665 666 /* 667 * cp210x_get_termios 668 * Reads the baud rate, data bits, parity, stop bits and flow control mode 669 * from the device, corrects any unsupported values, and configures the 670 * termios structure to reflect the state of the device 671 */ 672 static void cp210x_get_termios(struct tty_struct *tty, 673 struct usb_serial_port *port) 674 { 675 unsigned int baud; 676 677 if (tty) { 678 cp210x_get_termios_port(tty->driver_data, 679 &tty->termios.c_cflag, &baud); 680 tty_encode_baud_rate(tty, baud, baud); 681 } else { 682 unsigned int cflag; 683 cflag = 0; 684 cp210x_get_termios_port(port, &cflag, &baud); 685 } 686 } 687 688 /* 689 * cp210x_get_termios_port 690 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port. 691 */ 692 static void cp210x_get_termios_port(struct usb_serial_port *port, 693 unsigned int *cflagp, unsigned int *baudp) 694 { 695 struct device *dev = &port->dev; 696 unsigned int cflag; 697 u8 modem_ctl[16]; 698 u32 baud; 699 u16 bits; 700 701 cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud); 702 703 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud); 704 *baudp = baud; 705 706 cflag = *cflagp; 707 708 cp210x_get_line_ctl(port, &bits); 709 cflag &= ~CSIZE; 710 switch (bits & BITS_DATA_MASK) { 711 case BITS_DATA_5: 712 dev_dbg(dev, "%s - data bits = 5\n", __func__); 713 cflag |= CS5; 714 break; 715 case BITS_DATA_6: 716 dev_dbg(dev, "%s - data bits = 6\n", __func__); 717 cflag |= CS6; 718 break; 719 case BITS_DATA_7: 720 dev_dbg(dev, "%s - data bits = 7\n", __func__); 721 cflag |= CS7; 722 break; 723 case BITS_DATA_8: 724 dev_dbg(dev, "%s - data bits = 8\n", __func__); 725 cflag |= CS8; 726 break; 727 case BITS_DATA_9: 728 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__); 729 cflag |= CS8; 730 bits &= ~BITS_DATA_MASK; 731 bits |= BITS_DATA_8; 732 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 733 break; 734 default: 735 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__); 736 cflag |= CS8; 737 bits &= ~BITS_DATA_MASK; 738 bits |= BITS_DATA_8; 739 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 740 break; 741 } 742 743 switch (bits & BITS_PARITY_MASK) { 744 case BITS_PARITY_NONE: 745 dev_dbg(dev, "%s - parity = NONE\n", __func__); 746 cflag &= ~PARENB; 747 break; 748 case BITS_PARITY_ODD: 749 dev_dbg(dev, "%s - parity = ODD\n", __func__); 750 cflag |= (PARENB|PARODD); 751 break; 752 case BITS_PARITY_EVEN: 753 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 754 cflag &= ~PARODD; 755 cflag |= PARENB; 756 break; 757 case BITS_PARITY_MARK: 758 dev_dbg(dev, "%s - parity = MARK\n", __func__); 759 cflag |= (PARENB|PARODD|CMSPAR); 760 break; 761 case BITS_PARITY_SPACE: 762 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 763 cflag &= ~PARODD; 764 cflag |= (PARENB|CMSPAR); 765 break; 766 default: 767 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__); 768 cflag &= ~PARENB; 769 bits &= ~BITS_PARITY_MASK; 770 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 771 break; 772 } 773 774 cflag &= ~CSTOPB; 775 switch (bits & BITS_STOP_MASK) { 776 case BITS_STOP_1: 777 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 778 break; 779 case BITS_STOP_1_5: 780 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__); 781 bits &= ~BITS_STOP_MASK; 782 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 783 break; 784 case BITS_STOP_2: 785 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 786 cflag |= CSTOPB; 787 break; 788 default: 789 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__); 790 bits &= ~BITS_STOP_MASK; 791 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 792 break; 793 } 794 795 cp210x_read_reg_block(port, CP210X_GET_FLOW, modem_ctl, 796 sizeof(modem_ctl)); 797 if (modem_ctl[0] & 0x08) { 798 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 799 cflag |= CRTSCTS; 800 } else { 801 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 802 cflag &= ~CRTSCTS; 803 } 804 805 *cflagp = cflag; 806 } 807 808 /* 809 * CP2101 supports the following baud rates: 810 * 811 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 812 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 813 * 814 * CP2102 and CP2103 support the following additional rates: 815 * 816 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 817 * 576000 818 * 819 * The device will map a requested rate to a supported one, but the result 820 * of requests for rates greater than 1053257 is undefined (see AN205). 821 * 822 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 823 * respectively, with an error less than 1%. The actual rates are determined 824 * by 825 * 826 * div = round(freq / (2 x prescale x request)) 827 * actual = freq / (2 x prescale x div) 828 * 829 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 830 * or 1 otherwise. 831 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 832 * otherwise. 833 */ 834 static void cp210x_change_speed(struct tty_struct *tty, 835 struct usb_serial_port *port, struct ktermios *old_termios) 836 { 837 u32 baud; 838 839 baud = tty->termios.c_ospeed; 840 841 /* This maps the requested rate to a rate valid on cp2102 or cp2103, 842 * or to an arbitrary rate in [1M,2M]. 843 * 844 * NOTE: B0 is not implemented. 845 */ 846 baud = cp210x_quantise_baudrate(baud); 847 848 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 849 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { 850 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 851 if (old_termios) 852 baud = old_termios->c_ospeed; 853 else 854 baud = 9600; 855 } 856 857 tty_encode_baud_rate(tty, baud, baud); 858 } 859 860 static void cp210x_set_termios(struct tty_struct *tty, 861 struct usb_serial_port *port, struct ktermios *old_termios) 862 { 863 struct device *dev = &port->dev; 864 unsigned int cflag, old_cflag; 865 u16 bits; 866 u8 modem_ctl[16]; 867 868 cflag = tty->termios.c_cflag; 869 old_cflag = old_termios->c_cflag; 870 871 if (tty->termios.c_ospeed != old_termios->c_ospeed) 872 cp210x_change_speed(tty, port, old_termios); 873 874 /* If the number of data bits is to be updated */ 875 if ((cflag & CSIZE) != (old_cflag & CSIZE)) { 876 cp210x_get_line_ctl(port, &bits); 877 bits &= ~BITS_DATA_MASK; 878 switch (cflag & CSIZE) { 879 case CS5: 880 bits |= BITS_DATA_5; 881 dev_dbg(dev, "%s - data bits = 5\n", __func__); 882 break; 883 case CS6: 884 bits |= BITS_DATA_6; 885 dev_dbg(dev, "%s - data bits = 6\n", __func__); 886 break; 887 case CS7: 888 bits |= BITS_DATA_7; 889 dev_dbg(dev, "%s - data bits = 7\n", __func__); 890 break; 891 case CS8: 892 bits |= BITS_DATA_8; 893 dev_dbg(dev, "%s - data bits = 8\n", __func__); 894 break; 895 /*case CS9: 896 bits |= BITS_DATA_9; 897 dev_dbg(dev, "%s - data bits = 9\n", __func__); 898 break;*/ 899 default: 900 dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n"); 901 bits |= BITS_DATA_8; 902 break; 903 } 904 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 905 dev_dbg(dev, "Number of data bits requested not supported by device\n"); 906 } 907 908 if ((cflag & (PARENB|PARODD|CMSPAR)) != 909 (old_cflag & (PARENB|PARODD|CMSPAR))) { 910 cp210x_get_line_ctl(port, &bits); 911 bits &= ~BITS_PARITY_MASK; 912 if (cflag & PARENB) { 913 if (cflag & CMSPAR) { 914 if (cflag & PARODD) { 915 bits |= BITS_PARITY_MARK; 916 dev_dbg(dev, "%s - parity = MARK\n", __func__); 917 } else { 918 bits |= BITS_PARITY_SPACE; 919 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 920 } 921 } else { 922 if (cflag & PARODD) { 923 bits |= BITS_PARITY_ODD; 924 dev_dbg(dev, "%s - parity = ODD\n", __func__); 925 } else { 926 bits |= BITS_PARITY_EVEN; 927 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 928 } 929 } 930 } 931 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 932 dev_dbg(dev, "Parity mode not supported by device\n"); 933 } 934 935 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { 936 cp210x_get_line_ctl(port, &bits); 937 bits &= ~BITS_STOP_MASK; 938 if (cflag & CSTOPB) { 939 bits |= BITS_STOP_2; 940 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 941 } else { 942 bits |= BITS_STOP_1; 943 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 944 } 945 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 946 dev_dbg(dev, "Number of stop bits requested not supported by device\n"); 947 } 948 949 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 950 951 /* Only bytes 0, 4 and 7 out of first 8 have functional bits */ 952 953 cp210x_read_reg_block(port, CP210X_GET_FLOW, modem_ctl, 954 sizeof(modem_ctl)); 955 dev_dbg(dev, "%s - read modem controls = %02x .. .. .. %02x .. .. %02x\n", 956 __func__, modem_ctl[0], modem_ctl[4], modem_ctl[7]); 957 958 if (cflag & CRTSCTS) { 959 modem_ctl[0] &= ~0x7B; 960 modem_ctl[0] |= 0x09; 961 modem_ctl[4] = 0x80; 962 /* FIXME - why clear reserved bits just read? */ 963 modem_ctl[5] = 0; 964 modem_ctl[6] = 0; 965 modem_ctl[7] = 0; 966 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 967 } else { 968 modem_ctl[0] &= ~0x7B; 969 modem_ctl[0] |= 0x01; 970 /* FIXME - OR here instead of assignment looks wrong */ 971 modem_ctl[4] |= 0x40; 972 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 973 } 974 975 dev_dbg(dev, "%s - write modem controls = %02x .. .. .. %02x .. .. %02x\n", 976 __func__, modem_ctl[0], modem_ctl[4], modem_ctl[7]); 977 cp210x_write_reg_block(port, CP210X_SET_FLOW, modem_ctl, 978 sizeof(modem_ctl)); 979 } 980 981 } 982 983 static int cp210x_tiocmset(struct tty_struct *tty, 984 unsigned int set, unsigned int clear) 985 { 986 struct usb_serial_port *port = tty->driver_data; 987 return cp210x_tiocmset_port(port, set, clear); 988 } 989 990 static int cp210x_tiocmset_port(struct usb_serial_port *port, 991 unsigned int set, unsigned int clear) 992 { 993 u16 control = 0; 994 995 if (set & TIOCM_RTS) { 996 control |= CONTROL_RTS; 997 control |= CONTROL_WRITE_RTS; 998 } 999 if (set & TIOCM_DTR) { 1000 control |= CONTROL_DTR; 1001 control |= CONTROL_WRITE_DTR; 1002 } 1003 if (clear & TIOCM_RTS) { 1004 control &= ~CONTROL_RTS; 1005 control |= CONTROL_WRITE_RTS; 1006 } 1007 if (clear & TIOCM_DTR) { 1008 control &= ~CONTROL_DTR; 1009 control |= CONTROL_WRITE_DTR; 1010 } 1011 1012 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control); 1013 1014 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1015 } 1016 1017 static void cp210x_dtr_rts(struct usb_serial_port *p, int on) 1018 { 1019 if (on) 1020 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0); 1021 else 1022 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS); 1023 } 1024 1025 static int cp210x_tiocmget(struct tty_struct *tty) 1026 { 1027 struct usb_serial_port *port = tty->driver_data; 1028 u8 control; 1029 int result; 1030 1031 cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1032 1033 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1034 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1035 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1036 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1037 |((control & CONTROL_RING)? TIOCM_RI : 0) 1038 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1039 1040 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control); 1041 1042 return result; 1043 } 1044 1045 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 1046 { 1047 struct usb_serial_port *port = tty->driver_data; 1048 u16 state; 1049 1050 if (break_state == 0) 1051 state = BREAK_OFF; 1052 else 1053 state = BREAK_ON; 1054 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1055 state == BREAK_OFF ? "off" : "on"); 1056 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1057 } 1058 1059 static int cp210x_port_probe(struct usb_serial_port *port) 1060 { 1061 struct usb_serial *serial = port->serial; 1062 struct usb_host_interface *cur_altsetting; 1063 struct cp210x_port_private *port_priv; 1064 int ret; 1065 1066 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 1067 if (!port_priv) 1068 return -ENOMEM; 1069 1070 cur_altsetting = serial->interface->cur_altsetting; 1071 port_priv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber; 1072 1073 usb_set_serial_port_data(port, port_priv); 1074 1075 ret = cp210x_detect_swapped_line_ctl(port); 1076 if (ret) { 1077 kfree(port_priv); 1078 return ret; 1079 } 1080 1081 return 0; 1082 } 1083 1084 static int cp210x_port_remove(struct usb_serial_port *port) 1085 { 1086 struct cp210x_port_private *port_priv; 1087 1088 port_priv = usb_get_serial_port_data(port); 1089 kfree(port_priv); 1090 1091 return 0; 1092 } 1093 1094 module_usb_serial_driver(serial_drivers, id_table); 1095 1096 MODULE_DESCRIPTION(DRIVER_DESC); 1097 MODULE_LICENSE("GPL"); 1098