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, 0x82F4) }, /* Starizona MicroTouch */ 113 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */ 114 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */ 115 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */ 116 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */ 117 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */ 118 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ 119 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ 120 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 121 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */ 122 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ 123 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */ 124 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ 125 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ 126 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */ 127 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 128 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 129 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */ 130 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */ 131 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */ 132 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */ 133 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */ 134 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */ 135 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */ 136 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */ 137 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 138 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 139 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 140 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 141 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 142 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 143 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 144 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 145 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 146 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 147 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */ 148 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */ 149 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 150 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 151 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */ 152 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */ 153 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 154 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */ 155 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */ 156 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */ 157 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */ 158 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */ 159 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */ 160 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 161 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ 162 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ 163 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ 164 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ 165 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ 166 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ 167 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 168 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 169 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 170 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */ 171 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */ 172 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */ 173 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */ 174 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */ 175 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */ 176 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */ 177 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */ 178 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 179 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */ 180 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 181 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 182 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 183 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 184 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 185 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 186 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 187 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 188 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 189 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 190 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 191 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 192 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 193 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 194 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 195 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 196 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 197 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 198 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 199 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 200 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 201 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */ 202 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 203 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 204 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 205 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 206 { } /* Terminating Entry */ 207 }; 208 209 MODULE_DEVICE_TABLE(usb, id_table); 210 211 struct cp210x_port_private { 212 __u8 bInterfaceNumber; 213 bool has_swapped_line_ctl; 214 }; 215 216 static struct usb_serial_driver cp210x_device = { 217 .driver = { 218 .owner = THIS_MODULE, 219 .name = "cp210x", 220 }, 221 .id_table = id_table, 222 .num_ports = 1, 223 .bulk_in_size = 256, 224 .bulk_out_size = 256, 225 .open = cp210x_open, 226 .close = cp210x_close, 227 .break_ctl = cp210x_break_ctl, 228 .set_termios = cp210x_set_termios, 229 .tx_empty = cp210x_tx_empty, 230 .tiocmget = cp210x_tiocmget, 231 .tiocmset = cp210x_tiocmset, 232 .port_probe = cp210x_port_probe, 233 .port_remove = cp210x_port_remove, 234 .dtr_rts = cp210x_dtr_rts 235 }; 236 237 static struct usb_serial_driver * const serial_drivers[] = { 238 &cp210x_device, NULL 239 }; 240 241 /* Config request types */ 242 #define REQTYPE_HOST_TO_INTERFACE 0x41 243 #define REQTYPE_INTERFACE_TO_HOST 0xc1 244 #define REQTYPE_HOST_TO_DEVICE 0x40 245 #define REQTYPE_DEVICE_TO_HOST 0xc0 246 247 /* Config request codes */ 248 #define CP210X_IFC_ENABLE 0x00 249 #define CP210X_SET_BAUDDIV 0x01 250 #define CP210X_GET_BAUDDIV 0x02 251 #define CP210X_SET_LINE_CTL 0x03 252 #define CP210X_GET_LINE_CTL 0x04 253 #define CP210X_SET_BREAK 0x05 254 #define CP210X_IMM_CHAR 0x06 255 #define CP210X_SET_MHS 0x07 256 #define CP210X_GET_MDMSTS 0x08 257 #define CP210X_SET_XON 0x09 258 #define CP210X_SET_XOFF 0x0A 259 #define CP210X_SET_EVENTMASK 0x0B 260 #define CP210X_GET_EVENTMASK 0x0C 261 #define CP210X_SET_CHAR 0x0D 262 #define CP210X_GET_CHARS 0x0E 263 #define CP210X_GET_PROPS 0x0F 264 #define CP210X_GET_COMM_STATUS 0x10 265 #define CP210X_RESET 0x11 266 #define CP210X_PURGE 0x12 267 #define CP210X_SET_FLOW 0x13 268 #define CP210X_GET_FLOW 0x14 269 #define CP210X_EMBED_EVENTS 0x15 270 #define CP210X_GET_EVENTSTATE 0x16 271 #define CP210X_SET_CHARS 0x19 272 #define CP210X_GET_BAUDRATE 0x1D 273 #define CP210X_SET_BAUDRATE 0x1E 274 275 /* CP210X_IFC_ENABLE */ 276 #define UART_ENABLE 0x0001 277 #define UART_DISABLE 0x0000 278 279 /* CP210X_(SET|GET)_BAUDDIV */ 280 #define BAUD_RATE_GEN_FREQ 0x384000 281 282 /* CP210X_(SET|GET)_LINE_CTL */ 283 #define BITS_DATA_MASK 0X0f00 284 #define BITS_DATA_5 0X0500 285 #define BITS_DATA_6 0X0600 286 #define BITS_DATA_7 0X0700 287 #define BITS_DATA_8 0X0800 288 #define BITS_DATA_9 0X0900 289 290 #define BITS_PARITY_MASK 0x00f0 291 #define BITS_PARITY_NONE 0x0000 292 #define BITS_PARITY_ODD 0x0010 293 #define BITS_PARITY_EVEN 0x0020 294 #define BITS_PARITY_MARK 0x0030 295 #define BITS_PARITY_SPACE 0x0040 296 297 #define BITS_STOP_MASK 0x000f 298 #define BITS_STOP_1 0x0000 299 #define BITS_STOP_1_5 0x0001 300 #define BITS_STOP_2 0x0002 301 302 /* CP210X_SET_BREAK */ 303 #define BREAK_ON 0x0001 304 #define BREAK_OFF 0x0000 305 306 /* CP210X_(SET_MHS|GET_MDMSTS) */ 307 #define CONTROL_DTR 0x0001 308 #define CONTROL_RTS 0x0002 309 #define CONTROL_CTS 0x0010 310 #define CONTROL_DSR 0x0020 311 #define CONTROL_RING 0x0040 312 #define CONTROL_DCD 0x0080 313 #define CONTROL_WRITE_DTR 0x0100 314 #define CONTROL_WRITE_RTS 0x0200 315 316 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 317 struct cp210x_comm_status { 318 __le32 ulErrors; 319 __le32 ulHoldReasons; 320 __le32 ulAmountInInQueue; 321 __le32 ulAmountInOutQueue; 322 u8 bEofReceived; 323 u8 bWaitForImmediate; 324 u8 bReserved; 325 } __packed; 326 327 /* 328 * CP210X_PURGE - 16 bits passed in wValue of USB request. 329 * SiLabs app note AN571 gives a strange description of the 4 bits: 330 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 331 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 332 */ 333 #define PURGE_ALL 0x000f 334 335 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */ 336 struct cp210x_flow_ctl { 337 __le32 ulControlHandshake; 338 __le32 ulFlowReplace; 339 __le32 ulXonLimit; 340 __le32 ulXoffLimit; 341 } __packed; 342 343 /* cp210x_flow_ctl::ulControlHandshake */ 344 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0) 345 #define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode) 346 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3) 347 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4) 348 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5) 349 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6) 350 351 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */ 352 #define CP210X_SERIAL_DTR_INACTIVE 0 353 #define CP210X_SERIAL_DTR_ACTIVE 1 354 #define CP210X_SERIAL_DTR_FLOW_CTL 2 355 356 /* cp210x_flow_ctl::ulFlowReplace */ 357 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0) 358 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1) 359 #define CP210X_SERIAL_ERROR_CHAR BIT(2) 360 #define CP210X_SERIAL_NULL_STRIPPING BIT(3) 361 #define CP210X_SERIAL_BREAK_CHAR BIT(4) 362 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6) 363 #define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6) 364 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31) 365 366 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */ 367 #define CP210X_SERIAL_RTS_INACTIVE 0 368 #define CP210X_SERIAL_RTS_ACTIVE 1 369 #define CP210X_SERIAL_RTS_FLOW_CTL 2 370 371 /* 372 * Reads a variable-sized block of CP210X_ registers, identified by req. 373 * Returns data into buf in native USB byte order. 374 */ 375 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, 376 void *buf, int bufsize) 377 { 378 struct usb_serial *serial = port->serial; 379 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 380 void *dmabuf; 381 int result; 382 383 dmabuf = kmalloc(bufsize, GFP_KERNEL); 384 if (!dmabuf) { 385 /* 386 * FIXME Some callers don't bother to check for error, 387 * at least give them consistent junk until they are fixed 388 */ 389 memset(buf, 0, bufsize); 390 return -ENOMEM; 391 } 392 393 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 394 req, REQTYPE_INTERFACE_TO_HOST, 0, 395 port_priv->bInterfaceNumber, dmabuf, bufsize, 396 USB_CTRL_SET_TIMEOUT); 397 if (result == bufsize) { 398 memcpy(buf, dmabuf, bufsize); 399 result = 0; 400 } else { 401 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", 402 req, bufsize, result); 403 if (result >= 0) 404 result = -EPROTO; 405 406 /* 407 * FIXME Some callers don't bother to check for error, 408 * at least give them consistent junk until they are fixed 409 */ 410 memset(buf, 0, bufsize); 411 } 412 413 kfree(dmabuf); 414 415 return result; 416 } 417 418 /* 419 * Reads any 32-bit CP210X_ register identified by req. 420 */ 421 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val) 422 { 423 __le32 le32_val; 424 int err; 425 426 err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val)); 427 if (err) { 428 /* 429 * FIXME Some callers don't bother to check for error, 430 * at least give them consistent junk until they are fixed 431 */ 432 *val = 0; 433 return err; 434 } 435 436 *val = le32_to_cpu(le32_val); 437 438 return 0; 439 } 440 441 /* 442 * Reads any 16-bit CP210X_ register identified by req. 443 */ 444 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val) 445 { 446 __le16 le16_val; 447 int err; 448 449 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val)); 450 if (err) 451 return err; 452 453 *val = le16_to_cpu(le16_val); 454 455 return 0; 456 } 457 458 /* 459 * Reads any 8-bit CP210X_ register identified by req. 460 */ 461 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val) 462 { 463 return cp210x_read_reg_block(port, req, val, sizeof(*val)); 464 } 465 466 /* 467 * Writes any 16-bit CP210X_ register (req) whose value is passed 468 * entirely in the wValue field of the USB request. 469 */ 470 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) 471 { 472 struct usb_serial *serial = port->serial; 473 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 474 int result; 475 476 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 477 req, REQTYPE_HOST_TO_INTERFACE, val, 478 port_priv->bInterfaceNumber, NULL, 0, 479 USB_CTRL_SET_TIMEOUT); 480 if (result < 0) { 481 dev_err(&port->dev, "failed set request 0x%x status: %d\n", 482 req, result); 483 } 484 485 return result; 486 } 487 488 /* 489 * Writes a variable-sized block of CP210X_ registers, identified by req. 490 * Data in buf must be in native USB byte order. 491 */ 492 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req, 493 void *buf, int bufsize) 494 { 495 struct usb_serial *serial = port->serial; 496 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 497 void *dmabuf; 498 int result; 499 500 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 501 if (!dmabuf) 502 return -ENOMEM; 503 504 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 505 req, REQTYPE_HOST_TO_INTERFACE, 0, 506 port_priv->bInterfaceNumber, dmabuf, bufsize, 507 USB_CTRL_SET_TIMEOUT); 508 509 kfree(dmabuf); 510 511 if (result == bufsize) { 512 result = 0; 513 } else { 514 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", 515 req, bufsize, result); 516 if (result >= 0) 517 result = -EPROTO; 518 } 519 520 return result; 521 } 522 523 /* 524 * Writes any 32-bit CP210X_ register identified by req. 525 */ 526 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) 527 { 528 __le32 le32_val; 529 530 le32_val = cpu_to_le32(val); 531 532 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); 533 } 534 535 /* 536 * Detect CP2108 GET_LINE_CTL bug and activate workaround. 537 * Write a known good value 0x800, read it back. 538 * If it comes back swapped the bug is detected. 539 * Preserve the original register value. 540 */ 541 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port) 542 { 543 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 544 u16 line_ctl_save; 545 u16 line_ctl_test; 546 int err; 547 548 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save); 549 if (err) 550 return err; 551 552 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800); 553 if (err) 554 return err; 555 556 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test); 557 if (err) 558 return err; 559 560 if (line_ctl_test == 8) { 561 port_priv->has_swapped_line_ctl = true; 562 line_ctl_save = swab16(line_ctl_save); 563 } 564 565 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save); 566 } 567 568 /* 569 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL) 570 * to workaround cp2108 bug and get correct value. 571 */ 572 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl) 573 { 574 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 575 int err; 576 577 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl); 578 if (err) 579 return err; 580 581 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */ 582 if (port_priv->has_swapped_line_ctl) 583 *ctl = swab16(*ctl); 584 585 return 0; 586 } 587 588 /* 589 * cp210x_quantise_baudrate 590 * Quantises the baud rate as per AN205 Table 1 591 */ 592 static unsigned int cp210x_quantise_baudrate(unsigned int baud) 593 { 594 if (baud <= 300) 595 baud = 300; 596 else if (baud <= 600) baud = 600; 597 else if (baud <= 1200) baud = 1200; 598 else if (baud <= 1800) baud = 1800; 599 else if (baud <= 2400) baud = 2400; 600 else if (baud <= 4000) baud = 4000; 601 else if (baud <= 4803) baud = 4800; 602 else if (baud <= 7207) baud = 7200; 603 else if (baud <= 9612) baud = 9600; 604 else if (baud <= 14428) baud = 14400; 605 else if (baud <= 16062) baud = 16000; 606 else if (baud <= 19250) baud = 19200; 607 else if (baud <= 28912) baud = 28800; 608 else if (baud <= 38601) baud = 38400; 609 else if (baud <= 51558) baud = 51200; 610 else if (baud <= 56280) baud = 56000; 611 else if (baud <= 58053) baud = 57600; 612 else if (baud <= 64111) baud = 64000; 613 else if (baud <= 77608) baud = 76800; 614 else if (baud <= 117028) baud = 115200; 615 else if (baud <= 129347) baud = 128000; 616 else if (baud <= 156868) baud = 153600; 617 else if (baud <= 237832) baud = 230400; 618 else if (baud <= 254234) baud = 250000; 619 else if (baud <= 273066) baud = 256000; 620 else if (baud <= 491520) baud = 460800; 621 else if (baud <= 567138) baud = 500000; 622 else if (baud <= 670254) baud = 576000; 623 else if (baud < 1000000) 624 baud = 921600; 625 else if (baud > 2000000) 626 baud = 2000000; 627 return baud; 628 } 629 630 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 631 { 632 int result; 633 634 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 635 if (result) { 636 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 637 return result; 638 } 639 640 /* Configure the termios structure */ 641 cp210x_get_termios(tty, port); 642 643 /* The baud rate must be initialised on cp2104 */ 644 if (tty) 645 cp210x_change_speed(tty, port, NULL); 646 647 return usb_serial_generic_open(tty, port); 648 } 649 650 static void cp210x_close(struct usb_serial_port *port) 651 { 652 usb_serial_generic_close(port); 653 654 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 655 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 656 657 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 658 } 659 660 /* 661 * Read how many bytes are waiting in the TX queue. 662 */ 663 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 664 u32 *count) 665 { 666 struct usb_serial *serial = port->serial; 667 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 668 struct cp210x_comm_status *sts; 669 int result; 670 671 sts = kmalloc(sizeof(*sts), GFP_KERNEL); 672 if (!sts) 673 return -ENOMEM; 674 675 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 676 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST, 677 0, port_priv->bInterfaceNumber, sts, sizeof(*sts), 678 USB_CTRL_GET_TIMEOUT); 679 if (result == sizeof(*sts)) { 680 *count = le32_to_cpu(sts->ulAmountInOutQueue); 681 result = 0; 682 } else { 683 dev_err(&port->dev, "failed to get comm status: %d\n", result); 684 if (result >= 0) 685 result = -EPROTO; 686 } 687 688 kfree(sts); 689 690 return result; 691 } 692 693 static bool cp210x_tx_empty(struct usb_serial_port *port) 694 { 695 int err; 696 u32 count; 697 698 err = cp210x_get_tx_queue_byte_count(port, &count); 699 if (err) 700 return true; 701 702 return !count; 703 } 704 705 /* 706 * cp210x_get_termios 707 * Reads the baud rate, data bits, parity, stop bits and flow control mode 708 * from the device, corrects any unsupported values, and configures the 709 * termios structure to reflect the state of the device 710 */ 711 static void cp210x_get_termios(struct tty_struct *tty, 712 struct usb_serial_port *port) 713 { 714 unsigned int baud; 715 716 if (tty) { 717 cp210x_get_termios_port(tty->driver_data, 718 &tty->termios.c_cflag, &baud); 719 tty_encode_baud_rate(tty, baud, baud); 720 } else { 721 unsigned int cflag; 722 cflag = 0; 723 cp210x_get_termios_port(port, &cflag, &baud); 724 } 725 } 726 727 /* 728 * cp210x_get_termios_port 729 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port. 730 */ 731 static void cp210x_get_termios_port(struct usb_serial_port *port, 732 unsigned int *cflagp, unsigned int *baudp) 733 { 734 struct device *dev = &port->dev; 735 unsigned int cflag; 736 struct cp210x_flow_ctl flow_ctl; 737 u32 baud; 738 u16 bits; 739 u32 ctl_hs; 740 741 cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud); 742 743 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud); 744 *baudp = baud; 745 746 cflag = *cflagp; 747 748 cp210x_get_line_ctl(port, &bits); 749 cflag &= ~CSIZE; 750 switch (bits & BITS_DATA_MASK) { 751 case BITS_DATA_5: 752 dev_dbg(dev, "%s - data bits = 5\n", __func__); 753 cflag |= CS5; 754 break; 755 case BITS_DATA_6: 756 dev_dbg(dev, "%s - data bits = 6\n", __func__); 757 cflag |= CS6; 758 break; 759 case BITS_DATA_7: 760 dev_dbg(dev, "%s - data bits = 7\n", __func__); 761 cflag |= CS7; 762 break; 763 case BITS_DATA_8: 764 dev_dbg(dev, "%s - data bits = 8\n", __func__); 765 cflag |= CS8; 766 break; 767 case BITS_DATA_9: 768 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__); 769 cflag |= CS8; 770 bits &= ~BITS_DATA_MASK; 771 bits |= BITS_DATA_8; 772 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 773 break; 774 default: 775 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__); 776 cflag |= CS8; 777 bits &= ~BITS_DATA_MASK; 778 bits |= BITS_DATA_8; 779 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 780 break; 781 } 782 783 switch (bits & BITS_PARITY_MASK) { 784 case BITS_PARITY_NONE: 785 dev_dbg(dev, "%s - parity = NONE\n", __func__); 786 cflag &= ~PARENB; 787 break; 788 case BITS_PARITY_ODD: 789 dev_dbg(dev, "%s - parity = ODD\n", __func__); 790 cflag |= (PARENB|PARODD); 791 break; 792 case BITS_PARITY_EVEN: 793 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 794 cflag &= ~PARODD; 795 cflag |= PARENB; 796 break; 797 case BITS_PARITY_MARK: 798 dev_dbg(dev, "%s - parity = MARK\n", __func__); 799 cflag |= (PARENB|PARODD|CMSPAR); 800 break; 801 case BITS_PARITY_SPACE: 802 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 803 cflag &= ~PARODD; 804 cflag |= (PARENB|CMSPAR); 805 break; 806 default: 807 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__); 808 cflag &= ~PARENB; 809 bits &= ~BITS_PARITY_MASK; 810 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 811 break; 812 } 813 814 cflag &= ~CSTOPB; 815 switch (bits & BITS_STOP_MASK) { 816 case BITS_STOP_1: 817 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 818 break; 819 case BITS_STOP_1_5: 820 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__); 821 bits &= ~BITS_STOP_MASK; 822 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 823 break; 824 case BITS_STOP_2: 825 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 826 cflag |= CSTOPB; 827 break; 828 default: 829 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__); 830 bits &= ~BITS_STOP_MASK; 831 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 832 break; 833 } 834 835 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 836 sizeof(flow_ctl)); 837 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 838 if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) { 839 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 840 cflag |= CRTSCTS; 841 } else { 842 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 843 cflag &= ~CRTSCTS; 844 } 845 846 *cflagp = cflag; 847 } 848 849 /* 850 * CP2101 supports the following baud rates: 851 * 852 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 853 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 854 * 855 * CP2102 and CP2103 support the following additional rates: 856 * 857 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 858 * 576000 859 * 860 * The device will map a requested rate to a supported one, but the result 861 * of requests for rates greater than 1053257 is undefined (see AN205). 862 * 863 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 864 * respectively, with an error less than 1%. The actual rates are determined 865 * by 866 * 867 * div = round(freq / (2 x prescale x request)) 868 * actual = freq / (2 x prescale x div) 869 * 870 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 871 * or 1 otherwise. 872 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 873 * otherwise. 874 */ 875 static void cp210x_change_speed(struct tty_struct *tty, 876 struct usb_serial_port *port, struct ktermios *old_termios) 877 { 878 u32 baud; 879 880 baud = tty->termios.c_ospeed; 881 882 /* This maps the requested rate to a rate valid on cp2102 or cp2103, 883 * or to an arbitrary rate in [1M,2M]. 884 * 885 * NOTE: B0 is not implemented. 886 */ 887 baud = cp210x_quantise_baudrate(baud); 888 889 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 890 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { 891 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 892 if (old_termios) 893 baud = old_termios->c_ospeed; 894 else 895 baud = 9600; 896 } 897 898 tty_encode_baud_rate(tty, baud, baud); 899 } 900 901 static void cp210x_set_termios(struct tty_struct *tty, 902 struct usb_serial_port *port, struct ktermios *old_termios) 903 { 904 struct device *dev = &port->dev; 905 unsigned int cflag, old_cflag; 906 u16 bits; 907 908 cflag = tty->termios.c_cflag; 909 old_cflag = old_termios->c_cflag; 910 911 if (tty->termios.c_ospeed != old_termios->c_ospeed) 912 cp210x_change_speed(tty, port, old_termios); 913 914 /* If the number of data bits is to be updated */ 915 if ((cflag & CSIZE) != (old_cflag & CSIZE)) { 916 cp210x_get_line_ctl(port, &bits); 917 bits &= ~BITS_DATA_MASK; 918 switch (cflag & CSIZE) { 919 case CS5: 920 bits |= BITS_DATA_5; 921 dev_dbg(dev, "%s - data bits = 5\n", __func__); 922 break; 923 case CS6: 924 bits |= BITS_DATA_6; 925 dev_dbg(dev, "%s - data bits = 6\n", __func__); 926 break; 927 case CS7: 928 bits |= BITS_DATA_7; 929 dev_dbg(dev, "%s - data bits = 7\n", __func__); 930 break; 931 case CS8: 932 bits |= BITS_DATA_8; 933 dev_dbg(dev, "%s - data bits = 8\n", __func__); 934 break; 935 /*case CS9: 936 bits |= BITS_DATA_9; 937 dev_dbg(dev, "%s - data bits = 9\n", __func__); 938 break;*/ 939 default: 940 dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n"); 941 bits |= BITS_DATA_8; 942 break; 943 } 944 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 945 dev_dbg(dev, "Number of data bits requested not supported by device\n"); 946 } 947 948 if ((cflag & (PARENB|PARODD|CMSPAR)) != 949 (old_cflag & (PARENB|PARODD|CMSPAR))) { 950 cp210x_get_line_ctl(port, &bits); 951 bits &= ~BITS_PARITY_MASK; 952 if (cflag & PARENB) { 953 if (cflag & CMSPAR) { 954 if (cflag & PARODD) { 955 bits |= BITS_PARITY_MARK; 956 dev_dbg(dev, "%s - parity = MARK\n", __func__); 957 } else { 958 bits |= BITS_PARITY_SPACE; 959 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 960 } 961 } else { 962 if (cflag & PARODD) { 963 bits |= BITS_PARITY_ODD; 964 dev_dbg(dev, "%s - parity = ODD\n", __func__); 965 } else { 966 bits |= BITS_PARITY_EVEN; 967 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 968 } 969 } 970 } 971 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 972 dev_dbg(dev, "Parity mode not supported by device\n"); 973 } 974 975 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { 976 cp210x_get_line_ctl(port, &bits); 977 bits &= ~BITS_STOP_MASK; 978 if (cflag & CSTOPB) { 979 bits |= BITS_STOP_2; 980 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 981 } else { 982 bits |= BITS_STOP_1; 983 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 984 } 985 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 986 dev_dbg(dev, "Number of stop bits requested not supported by device\n"); 987 } 988 989 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 990 struct cp210x_flow_ctl flow_ctl; 991 u32 ctl_hs; 992 u32 flow_repl; 993 994 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 995 sizeof(flow_ctl)); 996 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 997 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 998 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n", 999 __func__, ctl_hs, flow_repl); 1000 1001 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE; 1002 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE; 1003 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY; 1004 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1005 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE); 1006 if (cflag & CRTSCTS) { 1007 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE; 1008 1009 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1010 flow_repl |= CP210X_SERIAL_RTS_SHIFT( 1011 CP210X_SERIAL_RTS_FLOW_CTL); 1012 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 1013 } else { 1014 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE; 1015 1016 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1017 flow_repl |= CP210X_SERIAL_RTS_SHIFT( 1018 CP210X_SERIAL_RTS_ACTIVE); 1019 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 1020 } 1021 1022 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n", 1023 __func__, ctl_hs, flow_repl); 1024 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1025 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1026 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1027 sizeof(flow_ctl)); 1028 } 1029 1030 } 1031 1032 static int cp210x_tiocmset(struct tty_struct *tty, 1033 unsigned int set, unsigned int clear) 1034 { 1035 struct usb_serial_port *port = tty->driver_data; 1036 return cp210x_tiocmset_port(port, set, clear); 1037 } 1038 1039 static int cp210x_tiocmset_port(struct usb_serial_port *port, 1040 unsigned int set, unsigned int clear) 1041 { 1042 u16 control = 0; 1043 1044 if (set & TIOCM_RTS) { 1045 control |= CONTROL_RTS; 1046 control |= CONTROL_WRITE_RTS; 1047 } 1048 if (set & TIOCM_DTR) { 1049 control |= CONTROL_DTR; 1050 control |= CONTROL_WRITE_DTR; 1051 } 1052 if (clear & TIOCM_RTS) { 1053 control &= ~CONTROL_RTS; 1054 control |= CONTROL_WRITE_RTS; 1055 } 1056 if (clear & TIOCM_DTR) { 1057 control &= ~CONTROL_DTR; 1058 control |= CONTROL_WRITE_DTR; 1059 } 1060 1061 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control); 1062 1063 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1064 } 1065 1066 static void cp210x_dtr_rts(struct usb_serial_port *p, int on) 1067 { 1068 if (on) 1069 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0); 1070 else 1071 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS); 1072 } 1073 1074 static int cp210x_tiocmget(struct tty_struct *tty) 1075 { 1076 struct usb_serial_port *port = tty->driver_data; 1077 u8 control; 1078 int result; 1079 1080 cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1081 1082 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1083 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1084 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1085 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1086 |((control & CONTROL_RING)? TIOCM_RI : 0) 1087 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1088 1089 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control); 1090 1091 return result; 1092 } 1093 1094 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 1095 { 1096 struct usb_serial_port *port = tty->driver_data; 1097 u16 state; 1098 1099 if (break_state == 0) 1100 state = BREAK_OFF; 1101 else 1102 state = BREAK_ON; 1103 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1104 state == BREAK_OFF ? "off" : "on"); 1105 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1106 } 1107 1108 static int cp210x_port_probe(struct usb_serial_port *port) 1109 { 1110 struct usb_serial *serial = port->serial; 1111 struct usb_host_interface *cur_altsetting; 1112 struct cp210x_port_private *port_priv; 1113 int ret; 1114 1115 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 1116 if (!port_priv) 1117 return -ENOMEM; 1118 1119 cur_altsetting = serial->interface->cur_altsetting; 1120 port_priv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber; 1121 1122 usb_set_serial_port_data(port, port_priv); 1123 1124 ret = cp210x_detect_swapped_line_ctl(port); 1125 if (ret) { 1126 kfree(port_priv); 1127 return ret; 1128 } 1129 1130 return 0; 1131 } 1132 1133 static int cp210x_port_remove(struct usb_serial_port *port) 1134 { 1135 struct cp210x_port_private *port_priv; 1136 1137 port_priv = usb_get_serial_port_data(port); 1138 kfree(port_priv); 1139 1140 return 0; 1141 } 1142 1143 module_usb_serial_driver(serial_drivers, id_table); 1144 1145 MODULE_DESCRIPTION(DRIVER_DESC); 1146 MODULE_LICENSE("GPL"); 1147