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 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */ 331 struct cp210x_flow_ctl { 332 __le32 ulControlHandshake; 333 __le32 ulFlowReplace; 334 __le32 ulXonLimit; 335 __le32 ulXoffLimit; 336 } __packed; 337 338 /* cp210x_flow_ctl::ulControlHandshake */ 339 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0) 340 #define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode) 341 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3) 342 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4) 343 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5) 344 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6) 345 346 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */ 347 #define CP210X_SERIAL_DTR_INACTIVE 0 348 #define CP210X_SERIAL_DTR_ACTIVE 1 349 #define CP210X_SERIAL_DTR_FLOW_CTL 2 350 351 /* cp210x_flow_ctl::ulFlowReplace */ 352 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0) 353 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1) 354 #define CP210X_SERIAL_ERROR_CHAR BIT(2) 355 #define CP210X_SERIAL_NULL_STRIPPING BIT(3) 356 #define CP210X_SERIAL_BREAK_CHAR BIT(4) 357 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6) 358 #define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6) 359 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31) 360 361 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */ 362 #define CP210X_SERIAL_RTS_INACTIVE 0 363 #define CP210X_SERIAL_RTS_ACTIVE 1 364 #define CP210X_SERIAL_RTS_FLOW_CTL 2 365 366 /* 367 * Reads a variable-sized block of CP210X_ registers, identified by req. 368 * Returns data into buf in native USB byte order. 369 */ 370 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, 371 void *buf, int bufsize) 372 { 373 struct usb_serial *serial = port->serial; 374 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 375 void *dmabuf; 376 int result; 377 378 dmabuf = kmalloc(bufsize, GFP_KERNEL); 379 if (!dmabuf) { 380 /* 381 * FIXME Some callers don't bother to check for error, 382 * at least give them consistent junk until they are fixed 383 */ 384 memset(buf, 0, bufsize); 385 return -ENOMEM; 386 } 387 388 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 389 req, REQTYPE_INTERFACE_TO_HOST, 0, 390 port_priv->bInterfaceNumber, dmabuf, bufsize, 391 USB_CTRL_SET_TIMEOUT); 392 if (result == bufsize) { 393 memcpy(buf, dmabuf, bufsize); 394 result = 0; 395 } else { 396 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", 397 req, bufsize, result); 398 if (result >= 0) 399 result = -EPROTO; 400 401 /* 402 * FIXME Some callers don't bother to check for error, 403 * at least give them consistent junk until they are fixed 404 */ 405 memset(buf, 0, bufsize); 406 } 407 408 kfree(dmabuf); 409 410 return result; 411 } 412 413 /* 414 * Reads any 32-bit CP210X_ register identified by req. 415 */ 416 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val) 417 { 418 __le32 le32_val; 419 int err; 420 421 err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val)); 422 if (err) { 423 /* 424 * FIXME Some callers don't bother to check for error, 425 * at least give them consistent junk until they are fixed 426 */ 427 *val = 0; 428 return err; 429 } 430 431 *val = le32_to_cpu(le32_val); 432 433 return 0; 434 } 435 436 /* 437 * Reads any 16-bit CP210X_ register identified by req. 438 */ 439 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val) 440 { 441 __le16 le16_val; 442 int err; 443 444 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val)); 445 if (err) 446 return err; 447 448 *val = le16_to_cpu(le16_val); 449 450 return 0; 451 } 452 453 /* 454 * Reads any 8-bit CP210X_ register identified by req. 455 */ 456 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val) 457 { 458 return cp210x_read_reg_block(port, req, val, sizeof(*val)); 459 } 460 461 /* 462 * Writes any 16-bit CP210X_ register (req) whose value is passed 463 * entirely in the wValue field of the USB request. 464 */ 465 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) 466 { 467 struct usb_serial *serial = port->serial; 468 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 469 int result; 470 471 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 472 req, REQTYPE_HOST_TO_INTERFACE, val, 473 port_priv->bInterfaceNumber, NULL, 0, 474 USB_CTRL_SET_TIMEOUT); 475 if (result < 0) { 476 dev_err(&port->dev, "failed set request 0x%x status: %d\n", 477 req, result); 478 } 479 480 return result; 481 } 482 483 /* 484 * Writes a variable-sized block of CP210X_ registers, identified by req. 485 * Data in buf must be in native USB byte order. 486 */ 487 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req, 488 void *buf, int bufsize) 489 { 490 struct usb_serial *serial = port->serial; 491 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 492 void *dmabuf; 493 int result; 494 495 dmabuf = kmalloc(bufsize, GFP_KERNEL); 496 if (!dmabuf) 497 return -ENOMEM; 498 499 memcpy(dmabuf, buf, bufsize); 500 501 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 502 req, REQTYPE_HOST_TO_INTERFACE, 0, 503 port_priv->bInterfaceNumber, dmabuf, bufsize, 504 USB_CTRL_SET_TIMEOUT); 505 506 kfree(dmabuf); 507 508 if (result == bufsize) { 509 result = 0; 510 } else { 511 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", 512 req, bufsize, result); 513 if (result >= 0) 514 result = -EPROTO; 515 } 516 517 return result; 518 } 519 520 /* 521 * Writes any 32-bit CP210X_ register identified by req. 522 */ 523 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) 524 { 525 __le32 le32_val; 526 527 le32_val = cpu_to_le32(val); 528 529 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); 530 } 531 532 /* 533 * Detect CP2108 GET_LINE_CTL bug and activate workaround. 534 * Write a known good value 0x800, read it back. 535 * If it comes back swapped the bug is detected. 536 * Preserve the original register value. 537 */ 538 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port) 539 { 540 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 541 u16 line_ctl_save; 542 u16 line_ctl_test; 543 int err; 544 545 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save); 546 if (err) 547 return err; 548 549 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800); 550 if (err) 551 return err; 552 553 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test); 554 if (err) 555 return err; 556 557 if (line_ctl_test == 8) { 558 port_priv->has_swapped_line_ctl = true; 559 line_ctl_save = swab16(line_ctl_save); 560 } 561 562 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save); 563 } 564 565 /* 566 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL) 567 * to workaround cp2108 bug and get correct value. 568 */ 569 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl) 570 { 571 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 572 int err; 573 574 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl); 575 if (err) 576 return err; 577 578 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */ 579 if (port_priv->has_swapped_line_ctl) 580 *ctl = swab16(*ctl); 581 582 return 0; 583 } 584 585 /* 586 * cp210x_quantise_baudrate 587 * Quantises the baud rate as per AN205 Table 1 588 */ 589 static unsigned int cp210x_quantise_baudrate(unsigned int baud) 590 { 591 if (baud <= 300) 592 baud = 300; 593 else if (baud <= 600) baud = 600; 594 else if (baud <= 1200) baud = 1200; 595 else if (baud <= 1800) baud = 1800; 596 else if (baud <= 2400) baud = 2400; 597 else if (baud <= 4000) baud = 4000; 598 else if (baud <= 4803) baud = 4800; 599 else if (baud <= 7207) baud = 7200; 600 else if (baud <= 9612) baud = 9600; 601 else if (baud <= 14428) baud = 14400; 602 else if (baud <= 16062) baud = 16000; 603 else if (baud <= 19250) baud = 19200; 604 else if (baud <= 28912) baud = 28800; 605 else if (baud <= 38601) baud = 38400; 606 else if (baud <= 51558) baud = 51200; 607 else if (baud <= 56280) baud = 56000; 608 else if (baud <= 58053) baud = 57600; 609 else if (baud <= 64111) baud = 64000; 610 else if (baud <= 77608) baud = 76800; 611 else if (baud <= 117028) baud = 115200; 612 else if (baud <= 129347) baud = 128000; 613 else if (baud <= 156868) baud = 153600; 614 else if (baud <= 237832) baud = 230400; 615 else if (baud <= 254234) baud = 250000; 616 else if (baud <= 273066) baud = 256000; 617 else if (baud <= 491520) baud = 460800; 618 else if (baud <= 567138) baud = 500000; 619 else if (baud <= 670254) baud = 576000; 620 else if (baud < 1000000) 621 baud = 921600; 622 else if (baud > 2000000) 623 baud = 2000000; 624 return baud; 625 } 626 627 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 628 { 629 int result; 630 631 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 632 if (result) { 633 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 634 return result; 635 } 636 637 /* Configure the termios structure */ 638 cp210x_get_termios(tty, port); 639 640 /* The baud rate must be initialised on cp2104 */ 641 if (tty) 642 cp210x_change_speed(tty, port, NULL); 643 644 return usb_serial_generic_open(tty, port); 645 } 646 647 static void cp210x_close(struct usb_serial_port *port) 648 { 649 usb_serial_generic_close(port); 650 651 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 652 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 653 654 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 655 } 656 657 /* 658 * Read how many bytes are waiting in the TX queue. 659 */ 660 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 661 u32 *count) 662 { 663 struct usb_serial *serial = port->serial; 664 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 665 struct cp210x_comm_status *sts; 666 int result; 667 668 sts = kmalloc(sizeof(*sts), GFP_KERNEL); 669 if (!sts) 670 return -ENOMEM; 671 672 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 673 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST, 674 0, port_priv->bInterfaceNumber, sts, sizeof(*sts), 675 USB_CTRL_GET_TIMEOUT); 676 if (result == sizeof(*sts)) { 677 *count = le32_to_cpu(sts->ulAmountInOutQueue); 678 result = 0; 679 } else { 680 dev_err(&port->dev, "failed to get comm status: %d\n", result); 681 if (result >= 0) 682 result = -EPROTO; 683 } 684 685 kfree(sts); 686 687 return result; 688 } 689 690 static bool cp210x_tx_empty(struct usb_serial_port *port) 691 { 692 int err; 693 u32 count; 694 695 err = cp210x_get_tx_queue_byte_count(port, &count); 696 if (err) 697 return true; 698 699 return !count; 700 } 701 702 /* 703 * cp210x_get_termios 704 * Reads the baud rate, data bits, parity, stop bits and flow control mode 705 * from the device, corrects any unsupported values, and configures the 706 * termios structure to reflect the state of the device 707 */ 708 static void cp210x_get_termios(struct tty_struct *tty, 709 struct usb_serial_port *port) 710 { 711 unsigned int baud; 712 713 if (tty) { 714 cp210x_get_termios_port(tty->driver_data, 715 &tty->termios.c_cflag, &baud); 716 tty_encode_baud_rate(tty, baud, baud); 717 } else { 718 unsigned int cflag; 719 cflag = 0; 720 cp210x_get_termios_port(port, &cflag, &baud); 721 } 722 } 723 724 /* 725 * cp210x_get_termios_port 726 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port. 727 */ 728 static void cp210x_get_termios_port(struct usb_serial_port *port, 729 unsigned int *cflagp, unsigned int *baudp) 730 { 731 struct device *dev = &port->dev; 732 unsigned int cflag; 733 struct cp210x_flow_ctl flow_ctl; 734 u32 baud; 735 u16 bits; 736 u32 ctl_hs; 737 738 cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud); 739 740 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud); 741 *baudp = baud; 742 743 cflag = *cflagp; 744 745 cp210x_get_line_ctl(port, &bits); 746 cflag &= ~CSIZE; 747 switch (bits & BITS_DATA_MASK) { 748 case BITS_DATA_5: 749 dev_dbg(dev, "%s - data bits = 5\n", __func__); 750 cflag |= CS5; 751 break; 752 case BITS_DATA_6: 753 dev_dbg(dev, "%s - data bits = 6\n", __func__); 754 cflag |= CS6; 755 break; 756 case BITS_DATA_7: 757 dev_dbg(dev, "%s - data bits = 7\n", __func__); 758 cflag |= CS7; 759 break; 760 case BITS_DATA_8: 761 dev_dbg(dev, "%s - data bits = 8\n", __func__); 762 cflag |= CS8; 763 break; 764 case BITS_DATA_9: 765 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__); 766 cflag |= CS8; 767 bits &= ~BITS_DATA_MASK; 768 bits |= BITS_DATA_8; 769 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 770 break; 771 default: 772 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__); 773 cflag |= CS8; 774 bits &= ~BITS_DATA_MASK; 775 bits |= BITS_DATA_8; 776 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 777 break; 778 } 779 780 switch (bits & BITS_PARITY_MASK) { 781 case BITS_PARITY_NONE: 782 dev_dbg(dev, "%s - parity = NONE\n", __func__); 783 cflag &= ~PARENB; 784 break; 785 case BITS_PARITY_ODD: 786 dev_dbg(dev, "%s - parity = ODD\n", __func__); 787 cflag |= (PARENB|PARODD); 788 break; 789 case BITS_PARITY_EVEN: 790 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 791 cflag &= ~PARODD; 792 cflag |= PARENB; 793 break; 794 case BITS_PARITY_MARK: 795 dev_dbg(dev, "%s - parity = MARK\n", __func__); 796 cflag |= (PARENB|PARODD|CMSPAR); 797 break; 798 case BITS_PARITY_SPACE: 799 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 800 cflag &= ~PARODD; 801 cflag |= (PARENB|CMSPAR); 802 break; 803 default: 804 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__); 805 cflag &= ~PARENB; 806 bits &= ~BITS_PARITY_MASK; 807 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 808 break; 809 } 810 811 cflag &= ~CSTOPB; 812 switch (bits & BITS_STOP_MASK) { 813 case BITS_STOP_1: 814 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 815 break; 816 case BITS_STOP_1_5: 817 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__); 818 bits &= ~BITS_STOP_MASK; 819 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 820 break; 821 case BITS_STOP_2: 822 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 823 cflag |= CSTOPB; 824 break; 825 default: 826 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__); 827 bits &= ~BITS_STOP_MASK; 828 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 829 break; 830 } 831 832 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 833 sizeof(flow_ctl)); 834 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 835 if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) { 836 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 837 cflag |= CRTSCTS; 838 } else { 839 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 840 cflag &= ~CRTSCTS; 841 } 842 843 *cflagp = cflag; 844 } 845 846 /* 847 * CP2101 supports the following baud rates: 848 * 849 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 850 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 851 * 852 * CP2102 and CP2103 support the following additional rates: 853 * 854 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 855 * 576000 856 * 857 * The device will map a requested rate to a supported one, but the result 858 * of requests for rates greater than 1053257 is undefined (see AN205). 859 * 860 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 861 * respectively, with an error less than 1%. The actual rates are determined 862 * by 863 * 864 * div = round(freq / (2 x prescale x request)) 865 * actual = freq / (2 x prescale x div) 866 * 867 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 868 * or 1 otherwise. 869 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 870 * otherwise. 871 */ 872 static void cp210x_change_speed(struct tty_struct *tty, 873 struct usb_serial_port *port, struct ktermios *old_termios) 874 { 875 u32 baud; 876 877 baud = tty->termios.c_ospeed; 878 879 /* This maps the requested rate to a rate valid on cp2102 or cp2103, 880 * or to an arbitrary rate in [1M,2M]. 881 * 882 * NOTE: B0 is not implemented. 883 */ 884 baud = cp210x_quantise_baudrate(baud); 885 886 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 887 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { 888 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 889 if (old_termios) 890 baud = old_termios->c_ospeed; 891 else 892 baud = 9600; 893 } 894 895 tty_encode_baud_rate(tty, baud, baud); 896 } 897 898 static void cp210x_set_termios(struct tty_struct *tty, 899 struct usb_serial_port *port, struct ktermios *old_termios) 900 { 901 struct device *dev = &port->dev; 902 unsigned int cflag, old_cflag; 903 u16 bits; 904 905 cflag = tty->termios.c_cflag; 906 old_cflag = old_termios->c_cflag; 907 908 if (tty->termios.c_ospeed != old_termios->c_ospeed) 909 cp210x_change_speed(tty, port, old_termios); 910 911 /* If the number of data bits is to be updated */ 912 if ((cflag & CSIZE) != (old_cflag & CSIZE)) { 913 cp210x_get_line_ctl(port, &bits); 914 bits &= ~BITS_DATA_MASK; 915 switch (cflag & CSIZE) { 916 case CS5: 917 bits |= BITS_DATA_5; 918 dev_dbg(dev, "%s - data bits = 5\n", __func__); 919 break; 920 case CS6: 921 bits |= BITS_DATA_6; 922 dev_dbg(dev, "%s - data bits = 6\n", __func__); 923 break; 924 case CS7: 925 bits |= BITS_DATA_7; 926 dev_dbg(dev, "%s - data bits = 7\n", __func__); 927 break; 928 case CS8: 929 bits |= BITS_DATA_8; 930 dev_dbg(dev, "%s - data bits = 8\n", __func__); 931 break; 932 /*case CS9: 933 bits |= BITS_DATA_9; 934 dev_dbg(dev, "%s - data bits = 9\n", __func__); 935 break;*/ 936 default: 937 dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n"); 938 bits |= BITS_DATA_8; 939 break; 940 } 941 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 942 dev_dbg(dev, "Number of data bits requested not supported by device\n"); 943 } 944 945 if ((cflag & (PARENB|PARODD|CMSPAR)) != 946 (old_cflag & (PARENB|PARODD|CMSPAR))) { 947 cp210x_get_line_ctl(port, &bits); 948 bits &= ~BITS_PARITY_MASK; 949 if (cflag & PARENB) { 950 if (cflag & CMSPAR) { 951 if (cflag & PARODD) { 952 bits |= BITS_PARITY_MARK; 953 dev_dbg(dev, "%s - parity = MARK\n", __func__); 954 } else { 955 bits |= BITS_PARITY_SPACE; 956 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 957 } 958 } else { 959 if (cflag & PARODD) { 960 bits |= BITS_PARITY_ODD; 961 dev_dbg(dev, "%s - parity = ODD\n", __func__); 962 } else { 963 bits |= BITS_PARITY_EVEN; 964 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 965 } 966 } 967 } 968 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 969 dev_dbg(dev, "Parity mode not supported by device\n"); 970 } 971 972 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { 973 cp210x_get_line_ctl(port, &bits); 974 bits &= ~BITS_STOP_MASK; 975 if (cflag & CSTOPB) { 976 bits |= BITS_STOP_2; 977 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 978 } else { 979 bits |= BITS_STOP_1; 980 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 981 } 982 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 983 dev_dbg(dev, "Number of stop bits requested not supported by device\n"); 984 } 985 986 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 987 struct cp210x_flow_ctl flow_ctl; 988 u32 ctl_hs; 989 u32 flow_repl; 990 991 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 992 sizeof(flow_ctl)); 993 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 994 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 995 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n", 996 __func__, ctl_hs, flow_repl); 997 998 if (cflag & CRTSCTS) { 999 ctl_hs &= ~(CP210X_SERIAL_DTR_MASK | 1000 CP210X_SERIAL_CTS_HANDSHAKE | 1001 CP210X_SERIAL_DSR_HANDSHAKE | 1002 CP210X_SERIAL_DCD_HANDSHAKE | 1003 CP210X_SERIAL_DSR_SENSITIVITY); 1004 ctl_hs |= CP210X_SERIAL_DTR_SHIFT( 1005 CP210X_SERIAL_DTR_ACTIVE); 1006 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE; 1007 /* 1008 * FIXME: Why clear bits unrelated to flow control. 1009 * Why clear CP210X_SERIAL_XOFF_CONTINUE which is 1010 * never set 1011 */ 1012 flow_repl = 0; 1013 flow_repl |= CP210X_SERIAL_RTS_SHIFT( 1014 CP210X_SERIAL_RTS_FLOW_CTL); 1015 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 1016 } else { 1017 ctl_hs &= ~(CP210X_SERIAL_DTR_MASK | 1018 CP210X_SERIAL_CTS_HANDSHAKE | 1019 CP210X_SERIAL_DSR_HANDSHAKE | 1020 CP210X_SERIAL_DCD_HANDSHAKE | 1021 CP210X_SERIAL_DSR_SENSITIVITY); 1022 ctl_hs |= CP210X_SERIAL_DTR_SHIFT( 1023 CP210X_SERIAL_DTR_ACTIVE); 1024 /* FIXME: Why clear bits unrelated to flow control */ 1025 flow_repl &= 0xffffff00; 1026 flow_repl |= CP210X_SERIAL_RTS_SHIFT( 1027 CP210X_SERIAL_RTS_ACTIVE); 1028 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 1029 } 1030 1031 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n", 1032 __func__, ctl_hs, flow_repl); 1033 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1034 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1035 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1036 sizeof(flow_ctl)); 1037 } 1038 1039 } 1040 1041 static int cp210x_tiocmset(struct tty_struct *tty, 1042 unsigned int set, unsigned int clear) 1043 { 1044 struct usb_serial_port *port = tty->driver_data; 1045 return cp210x_tiocmset_port(port, set, clear); 1046 } 1047 1048 static int cp210x_tiocmset_port(struct usb_serial_port *port, 1049 unsigned int set, unsigned int clear) 1050 { 1051 u16 control = 0; 1052 1053 if (set & TIOCM_RTS) { 1054 control |= CONTROL_RTS; 1055 control |= CONTROL_WRITE_RTS; 1056 } 1057 if (set & TIOCM_DTR) { 1058 control |= CONTROL_DTR; 1059 control |= CONTROL_WRITE_DTR; 1060 } 1061 if (clear & TIOCM_RTS) { 1062 control &= ~CONTROL_RTS; 1063 control |= CONTROL_WRITE_RTS; 1064 } 1065 if (clear & TIOCM_DTR) { 1066 control &= ~CONTROL_DTR; 1067 control |= CONTROL_WRITE_DTR; 1068 } 1069 1070 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control); 1071 1072 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1073 } 1074 1075 static void cp210x_dtr_rts(struct usb_serial_port *p, int on) 1076 { 1077 if (on) 1078 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0); 1079 else 1080 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS); 1081 } 1082 1083 static int cp210x_tiocmget(struct tty_struct *tty) 1084 { 1085 struct usb_serial_port *port = tty->driver_data; 1086 u8 control; 1087 int result; 1088 1089 cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1090 1091 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1092 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1093 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1094 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1095 |((control & CONTROL_RING)? TIOCM_RI : 0) 1096 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1097 1098 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control); 1099 1100 return result; 1101 } 1102 1103 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 1104 { 1105 struct usb_serial_port *port = tty->driver_data; 1106 u16 state; 1107 1108 if (break_state == 0) 1109 state = BREAK_OFF; 1110 else 1111 state = BREAK_ON; 1112 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1113 state == BREAK_OFF ? "off" : "on"); 1114 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1115 } 1116 1117 static int cp210x_port_probe(struct usb_serial_port *port) 1118 { 1119 struct usb_serial *serial = port->serial; 1120 struct usb_host_interface *cur_altsetting; 1121 struct cp210x_port_private *port_priv; 1122 int ret; 1123 1124 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 1125 if (!port_priv) 1126 return -ENOMEM; 1127 1128 cur_altsetting = serial->interface->cur_altsetting; 1129 port_priv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber; 1130 1131 usb_set_serial_port_data(port, port_priv); 1132 1133 ret = cp210x_detect_swapped_line_ctl(port); 1134 if (ret) { 1135 kfree(port_priv); 1136 return ret; 1137 } 1138 1139 return 0; 1140 } 1141 1142 static int cp210x_port_remove(struct usb_serial_port *port) 1143 { 1144 struct cp210x_port_private *port_priv; 1145 1146 port_priv = usb_get_serial_port_data(port); 1147 kfree(port_priv); 1148 1149 return 0; 1150 } 1151 1152 module_usb_serial_driver(serial_drivers, id_table); 1153 1154 MODULE_DESCRIPTION(DRIVER_DESC); 1155 MODULE_LICENSE("GPL"); 1156