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 #include <linux/gpio/driver.h> 27 #include <linux/bitops.h> 28 #include <linux/mutex.h> 29 30 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver" 31 32 /* 33 * Function Prototypes 34 */ 35 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *); 36 static void cp210x_close(struct usb_serial_port *); 37 static void cp210x_get_termios(struct tty_struct *, struct usb_serial_port *); 38 static void cp210x_get_termios_port(struct usb_serial_port *port, 39 tcflag_t *cflagp, unsigned int *baudp); 40 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *, 41 struct ktermios *); 42 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *, 43 struct ktermios*); 44 static bool cp210x_tx_empty(struct usb_serial_port *port); 45 static int cp210x_tiocmget(struct tty_struct *); 46 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int); 47 static int cp210x_tiocmset_port(struct usb_serial_port *port, 48 unsigned int, unsigned int); 49 static void cp210x_break_ctl(struct tty_struct *, int); 50 static int cp210x_attach(struct usb_serial *); 51 static void cp210x_disconnect(struct usb_serial *); 52 static void cp210x_release(struct usb_serial *); 53 static int cp210x_port_probe(struct usb_serial_port *); 54 static int cp210x_port_remove(struct usb_serial_port *); 55 static void cp210x_dtr_rts(struct usb_serial_port *p, int on); 56 57 static const struct usb_device_id id_table[] = { 58 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */ 59 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */ 60 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 61 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 62 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */ 63 { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */ 64 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */ 65 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */ 66 { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */ 67 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */ 68 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */ 69 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */ 70 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */ 71 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */ 72 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */ 73 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */ 74 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */ 75 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */ 76 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */ 77 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */ 78 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */ 79 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */ 80 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */ 81 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */ 82 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */ 83 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */ 84 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */ 85 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */ 86 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */ 87 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */ 88 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */ 89 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */ 90 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */ 91 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */ 92 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */ 93 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */ 94 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */ 95 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */ 96 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */ 97 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */ 98 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */ 99 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */ 100 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */ 101 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */ 102 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */ 103 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */ 104 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */ 105 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */ 106 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */ 107 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */ 108 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */ 109 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */ 110 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */ 111 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */ 112 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */ 113 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */ 114 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */ 115 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */ 116 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */ 117 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */ 118 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */ 119 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */ 120 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */ 121 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */ 122 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */ 123 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */ 124 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ 125 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ 126 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 127 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */ 128 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ 129 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */ 130 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ 131 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ 132 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */ 133 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 134 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 135 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */ 136 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */ 137 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */ 138 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */ 139 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */ 140 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */ 141 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */ 142 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */ 143 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */ 144 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */ 145 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 146 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 147 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 148 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 149 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 150 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 151 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 152 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 153 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 154 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 155 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */ 156 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */ 157 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 158 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 159 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */ 160 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */ 161 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 162 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */ 163 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */ 164 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */ 165 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */ 166 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */ 167 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */ 168 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 169 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ 170 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ 171 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ 172 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ 173 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ 174 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ 175 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 176 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 177 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 178 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */ 179 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */ 180 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */ 181 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */ 182 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */ 183 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */ 184 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */ 185 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */ 186 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */ 187 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */ 188 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 189 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */ 190 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 191 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 192 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 193 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 194 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 195 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 196 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 197 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 198 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 199 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 200 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 201 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 202 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 203 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 204 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 205 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 206 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 207 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 208 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 209 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 210 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 211 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */ 212 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 213 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 214 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 215 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 216 { } /* Terminating Entry */ 217 }; 218 219 MODULE_DEVICE_TABLE(usb, id_table); 220 221 struct cp210x_serial_private { 222 #ifdef CONFIG_GPIOLIB 223 struct gpio_chip gc; 224 u8 config; 225 u8 gpio_mode; 226 bool gpio_registered; 227 #endif 228 u8 partnum; 229 }; 230 231 struct cp210x_port_private { 232 __u8 bInterfaceNumber; 233 bool has_swapped_line_ctl; 234 }; 235 236 static struct usb_serial_driver cp210x_device = { 237 .driver = { 238 .owner = THIS_MODULE, 239 .name = "cp210x", 240 }, 241 .id_table = id_table, 242 .num_ports = 1, 243 .bulk_in_size = 256, 244 .bulk_out_size = 256, 245 .open = cp210x_open, 246 .close = cp210x_close, 247 .break_ctl = cp210x_break_ctl, 248 .set_termios = cp210x_set_termios, 249 .tx_empty = cp210x_tx_empty, 250 .tiocmget = cp210x_tiocmget, 251 .tiocmset = cp210x_tiocmset, 252 .attach = cp210x_attach, 253 .disconnect = cp210x_disconnect, 254 .release = cp210x_release, 255 .port_probe = cp210x_port_probe, 256 .port_remove = cp210x_port_remove, 257 .dtr_rts = cp210x_dtr_rts 258 }; 259 260 static struct usb_serial_driver * const serial_drivers[] = { 261 &cp210x_device, NULL 262 }; 263 264 /* Config request types */ 265 #define REQTYPE_HOST_TO_INTERFACE 0x41 266 #define REQTYPE_INTERFACE_TO_HOST 0xc1 267 #define REQTYPE_HOST_TO_DEVICE 0x40 268 #define REQTYPE_DEVICE_TO_HOST 0xc0 269 270 /* Config request codes */ 271 #define CP210X_IFC_ENABLE 0x00 272 #define CP210X_SET_BAUDDIV 0x01 273 #define CP210X_GET_BAUDDIV 0x02 274 #define CP210X_SET_LINE_CTL 0x03 275 #define CP210X_GET_LINE_CTL 0x04 276 #define CP210X_SET_BREAK 0x05 277 #define CP210X_IMM_CHAR 0x06 278 #define CP210X_SET_MHS 0x07 279 #define CP210X_GET_MDMSTS 0x08 280 #define CP210X_SET_XON 0x09 281 #define CP210X_SET_XOFF 0x0A 282 #define CP210X_SET_EVENTMASK 0x0B 283 #define CP210X_GET_EVENTMASK 0x0C 284 #define CP210X_SET_CHAR 0x0D 285 #define CP210X_GET_CHARS 0x0E 286 #define CP210X_GET_PROPS 0x0F 287 #define CP210X_GET_COMM_STATUS 0x10 288 #define CP210X_RESET 0x11 289 #define CP210X_PURGE 0x12 290 #define CP210X_SET_FLOW 0x13 291 #define CP210X_GET_FLOW 0x14 292 #define CP210X_EMBED_EVENTS 0x15 293 #define CP210X_GET_EVENTSTATE 0x16 294 #define CP210X_SET_CHARS 0x19 295 #define CP210X_GET_BAUDRATE 0x1D 296 #define CP210X_SET_BAUDRATE 0x1E 297 #define CP210X_VENDOR_SPECIFIC 0xFF 298 299 /* CP210X_IFC_ENABLE */ 300 #define UART_ENABLE 0x0001 301 #define UART_DISABLE 0x0000 302 303 /* CP210X_(SET|GET)_BAUDDIV */ 304 #define BAUD_RATE_GEN_FREQ 0x384000 305 306 /* CP210X_(SET|GET)_LINE_CTL */ 307 #define BITS_DATA_MASK 0X0f00 308 #define BITS_DATA_5 0X0500 309 #define BITS_DATA_6 0X0600 310 #define BITS_DATA_7 0X0700 311 #define BITS_DATA_8 0X0800 312 #define BITS_DATA_9 0X0900 313 314 #define BITS_PARITY_MASK 0x00f0 315 #define BITS_PARITY_NONE 0x0000 316 #define BITS_PARITY_ODD 0x0010 317 #define BITS_PARITY_EVEN 0x0020 318 #define BITS_PARITY_MARK 0x0030 319 #define BITS_PARITY_SPACE 0x0040 320 321 #define BITS_STOP_MASK 0x000f 322 #define BITS_STOP_1 0x0000 323 #define BITS_STOP_1_5 0x0001 324 #define BITS_STOP_2 0x0002 325 326 /* CP210X_SET_BREAK */ 327 #define BREAK_ON 0x0001 328 #define BREAK_OFF 0x0000 329 330 /* CP210X_(SET_MHS|GET_MDMSTS) */ 331 #define CONTROL_DTR 0x0001 332 #define CONTROL_RTS 0x0002 333 #define CONTROL_CTS 0x0010 334 #define CONTROL_DSR 0x0020 335 #define CONTROL_RING 0x0040 336 #define CONTROL_DCD 0x0080 337 #define CONTROL_WRITE_DTR 0x0100 338 #define CONTROL_WRITE_RTS 0x0200 339 340 /* CP210X_VENDOR_SPECIFIC values */ 341 #define CP210X_READ_LATCH 0x00C2 342 #define CP210X_GET_PARTNUM 0x370B 343 #define CP210X_GET_PORTCONFIG 0x370C 344 #define CP210X_GET_DEVICEMODE 0x3711 345 #define CP210X_WRITE_LATCH 0x37E1 346 347 /* Part number definitions */ 348 #define CP210X_PARTNUM_CP2101 0x01 349 #define CP210X_PARTNUM_CP2102 0x02 350 #define CP210X_PARTNUM_CP2103 0x03 351 #define CP210X_PARTNUM_CP2104 0x04 352 #define CP210X_PARTNUM_CP2105 0x05 353 #define CP210X_PARTNUM_CP2108 0x08 354 355 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 356 struct cp210x_comm_status { 357 __le32 ulErrors; 358 __le32 ulHoldReasons; 359 __le32 ulAmountInInQueue; 360 __le32 ulAmountInOutQueue; 361 u8 bEofReceived; 362 u8 bWaitForImmediate; 363 u8 bReserved; 364 } __packed; 365 366 /* 367 * CP210X_PURGE - 16 bits passed in wValue of USB request. 368 * SiLabs app note AN571 gives a strange description of the 4 bits: 369 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 370 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 371 */ 372 #define PURGE_ALL 0x000f 373 374 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */ 375 struct cp210x_flow_ctl { 376 __le32 ulControlHandshake; 377 __le32 ulFlowReplace; 378 __le32 ulXonLimit; 379 __le32 ulXoffLimit; 380 } __packed; 381 382 /* cp210x_flow_ctl::ulControlHandshake */ 383 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0) 384 #define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode) 385 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3) 386 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4) 387 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5) 388 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6) 389 390 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */ 391 #define CP210X_SERIAL_DTR_INACTIVE 0 392 #define CP210X_SERIAL_DTR_ACTIVE 1 393 #define CP210X_SERIAL_DTR_FLOW_CTL 2 394 395 /* cp210x_flow_ctl::ulFlowReplace */ 396 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0) 397 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1) 398 #define CP210X_SERIAL_ERROR_CHAR BIT(2) 399 #define CP210X_SERIAL_NULL_STRIPPING BIT(3) 400 #define CP210X_SERIAL_BREAK_CHAR BIT(4) 401 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6) 402 #define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6) 403 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31) 404 405 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */ 406 #define CP210X_SERIAL_RTS_INACTIVE 0 407 #define CP210X_SERIAL_RTS_ACTIVE 1 408 #define CP210X_SERIAL_RTS_FLOW_CTL 2 409 410 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */ 411 struct cp210x_pin_mode { 412 u8 eci; 413 u8 sci; 414 } __packed; 415 416 #define CP210X_PIN_MODE_MODEM 0 417 #define CP210X_PIN_MODE_GPIO BIT(0) 418 419 /* 420 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes. 421 * Structure needs padding due to unused/unspecified bytes. 422 */ 423 struct cp210x_config { 424 __le16 gpio_mode; 425 u8 __pad0[2]; 426 __le16 reset_state; 427 u8 __pad1[4]; 428 __le16 suspend_state; 429 u8 sci_cfg; 430 u8 eci_cfg; 431 u8 device_cfg; 432 } __packed; 433 434 /* GPIO modes */ 435 #define CP210X_SCI_GPIO_MODE_OFFSET 9 436 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9) 437 438 #define CP210X_ECI_GPIO_MODE_OFFSET 2 439 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2) 440 441 /* CP2105 port configuration values */ 442 #define CP2105_GPIO0_TXLED_MODE BIT(0) 443 #define CP2105_GPIO1_RXLED_MODE BIT(1) 444 #define CP2105_GPIO1_RS485_MODE BIT(2) 445 446 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */ 447 struct cp210x_gpio_write { 448 u8 mask; 449 u8 state; 450 } __packed; 451 452 /* 453 * Helper to get interface number when we only have struct usb_serial. 454 */ 455 static u8 cp210x_interface_num(struct usb_serial *serial) 456 { 457 struct usb_host_interface *cur_altsetting; 458 459 cur_altsetting = serial->interface->cur_altsetting; 460 461 return cur_altsetting->desc.bInterfaceNumber; 462 } 463 464 /* 465 * Reads a variable-sized block of CP210X_ registers, identified by req. 466 * Returns data into buf in native USB byte order. 467 */ 468 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, 469 void *buf, int bufsize) 470 { 471 struct usb_serial *serial = port->serial; 472 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 473 void *dmabuf; 474 int result; 475 476 dmabuf = kmalloc(bufsize, GFP_KERNEL); 477 if (!dmabuf) { 478 /* 479 * FIXME Some callers don't bother to check for error, 480 * at least give them consistent junk until they are fixed 481 */ 482 memset(buf, 0, bufsize); 483 return -ENOMEM; 484 } 485 486 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 487 req, REQTYPE_INTERFACE_TO_HOST, 0, 488 port_priv->bInterfaceNumber, dmabuf, bufsize, 489 USB_CTRL_SET_TIMEOUT); 490 if (result == bufsize) { 491 memcpy(buf, dmabuf, bufsize); 492 result = 0; 493 } else { 494 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", 495 req, bufsize, result); 496 if (result >= 0) 497 result = -EIO; 498 499 /* 500 * FIXME Some callers don't bother to check for error, 501 * at least give them consistent junk until they are fixed 502 */ 503 memset(buf, 0, bufsize); 504 } 505 506 kfree(dmabuf); 507 508 return result; 509 } 510 511 /* 512 * Reads any 32-bit CP210X_ register identified by req. 513 */ 514 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val) 515 { 516 __le32 le32_val; 517 int err; 518 519 err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val)); 520 if (err) { 521 /* 522 * FIXME Some callers don't bother to check for error, 523 * at least give them consistent junk until they are fixed 524 */ 525 *val = 0; 526 return err; 527 } 528 529 *val = le32_to_cpu(le32_val); 530 531 return 0; 532 } 533 534 /* 535 * Reads any 16-bit CP210X_ register identified by req. 536 */ 537 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val) 538 { 539 __le16 le16_val; 540 int err; 541 542 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val)); 543 if (err) 544 return err; 545 546 *val = le16_to_cpu(le16_val); 547 548 return 0; 549 } 550 551 /* 552 * Reads any 8-bit CP210X_ register identified by req. 553 */ 554 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val) 555 { 556 return cp210x_read_reg_block(port, req, val, sizeof(*val)); 557 } 558 559 /* 560 * Reads a variable-sized vendor block of CP210X_ registers, identified by val. 561 * Returns data into buf in native USB byte order. 562 */ 563 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val, 564 void *buf, int bufsize) 565 { 566 void *dmabuf; 567 int result; 568 569 dmabuf = kmalloc(bufsize, GFP_KERNEL); 570 if (!dmabuf) 571 return -ENOMEM; 572 573 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 574 CP210X_VENDOR_SPECIFIC, type, val, 575 cp210x_interface_num(serial), dmabuf, bufsize, 576 USB_CTRL_GET_TIMEOUT); 577 if (result == bufsize) { 578 memcpy(buf, dmabuf, bufsize); 579 result = 0; 580 } else { 581 dev_err(&serial->interface->dev, 582 "failed to get vendor val 0x%04x size %d: %d\n", val, 583 bufsize, result); 584 if (result >= 0) 585 result = -EIO; 586 } 587 588 kfree(dmabuf); 589 590 return result; 591 } 592 593 /* 594 * Writes any 16-bit CP210X_ register (req) whose value is passed 595 * entirely in the wValue field of the USB request. 596 */ 597 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) 598 { 599 struct usb_serial *serial = port->serial; 600 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 601 int result; 602 603 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 604 req, REQTYPE_HOST_TO_INTERFACE, val, 605 port_priv->bInterfaceNumber, NULL, 0, 606 USB_CTRL_SET_TIMEOUT); 607 if (result < 0) { 608 dev_err(&port->dev, "failed set request 0x%x status: %d\n", 609 req, result); 610 } 611 612 return result; 613 } 614 615 /* 616 * Writes a variable-sized block of CP210X_ registers, identified by req. 617 * Data in buf must be in native USB byte order. 618 */ 619 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req, 620 void *buf, int bufsize) 621 { 622 struct usb_serial *serial = port->serial; 623 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 624 void *dmabuf; 625 int result; 626 627 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 628 if (!dmabuf) 629 return -ENOMEM; 630 631 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 632 req, REQTYPE_HOST_TO_INTERFACE, 0, 633 port_priv->bInterfaceNumber, dmabuf, bufsize, 634 USB_CTRL_SET_TIMEOUT); 635 636 kfree(dmabuf); 637 638 if (result == bufsize) { 639 result = 0; 640 } else { 641 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", 642 req, bufsize, result); 643 if (result >= 0) 644 result = -EIO; 645 } 646 647 return result; 648 } 649 650 /* 651 * Writes any 32-bit CP210X_ register identified by req. 652 */ 653 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) 654 { 655 __le32 le32_val; 656 657 le32_val = cpu_to_le32(val); 658 659 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); 660 } 661 662 #ifdef CONFIG_GPIOLIB 663 /* 664 * Writes a variable-sized vendor block of CP210X_ registers, identified by val. 665 * Data in buf must be in native USB byte order. 666 */ 667 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type, 668 u16 val, void *buf, int bufsize) 669 { 670 void *dmabuf; 671 int result; 672 673 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 674 if (!dmabuf) 675 return -ENOMEM; 676 677 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 678 CP210X_VENDOR_SPECIFIC, type, val, 679 cp210x_interface_num(serial), dmabuf, bufsize, 680 USB_CTRL_SET_TIMEOUT); 681 682 kfree(dmabuf); 683 684 if (result == bufsize) { 685 result = 0; 686 } else { 687 dev_err(&serial->interface->dev, 688 "failed to set vendor val 0x%04x size %d: %d\n", val, 689 bufsize, result); 690 if (result >= 0) 691 result = -EIO; 692 } 693 694 return result; 695 } 696 #endif 697 698 /* 699 * Detect CP2108 GET_LINE_CTL bug and activate workaround. 700 * Write a known good value 0x800, read it back. 701 * If it comes back swapped the bug is detected. 702 * Preserve the original register value. 703 */ 704 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port) 705 { 706 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 707 u16 line_ctl_save; 708 u16 line_ctl_test; 709 int err; 710 711 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save); 712 if (err) 713 return err; 714 715 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800); 716 if (err) 717 return err; 718 719 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test); 720 if (err) 721 return err; 722 723 if (line_ctl_test == 8) { 724 port_priv->has_swapped_line_ctl = true; 725 line_ctl_save = swab16(line_ctl_save); 726 } 727 728 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save); 729 } 730 731 /* 732 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL) 733 * to workaround cp2108 bug and get correct value. 734 */ 735 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl) 736 { 737 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 738 int err; 739 740 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl); 741 if (err) 742 return err; 743 744 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */ 745 if (port_priv->has_swapped_line_ctl) 746 *ctl = swab16(*ctl); 747 748 return 0; 749 } 750 751 /* 752 * cp210x_quantise_baudrate 753 * Quantises the baud rate as per AN205 Table 1 754 */ 755 static unsigned int cp210x_quantise_baudrate(unsigned int baud) 756 { 757 if (baud <= 300) 758 baud = 300; 759 else if (baud <= 600) baud = 600; 760 else if (baud <= 1200) baud = 1200; 761 else if (baud <= 1800) baud = 1800; 762 else if (baud <= 2400) baud = 2400; 763 else if (baud <= 4000) baud = 4000; 764 else if (baud <= 4803) baud = 4800; 765 else if (baud <= 7207) baud = 7200; 766 else if (baud <= 9612) baud = 9600; 767 else if (baud <= 14428) baud = 14400; 768 else if (baud <= 16062) baud = 16000; 769 else if (baud <= 19250) baud = 19200; 770 else if (baud <= 28912) baud = 28800; 771 else if (baud <= 38601) baud = 38400; 772 else if (baud <= 51558) baud = 51200; 773 else if (baud <= 56280) baud = 56000; 774 else if (baud <= 58053) baud = 57600; 775 else if (baud <= 64111) baud = 64000; 776 else if (baud <= 77608) baud = 76800; 777 else if (baud <= 117028) baud = 115200; 778 else if (baud <= 129347) baud = 128000; 779 else if (baud <= 156868) baud = 153600; 780 else if (baud <= 237832) baud = 230400; 781 else if (baud <= 254234) baud = 250000; 782 else if (baud <= 273066) baud = 256000; 783 else if (baud <= 491520) baud = 460800; 784 else if (baud <= 567138) baud = 500000; 785 else if (baud <= 670254) baud = 576000; 786 else if (baud < 1000000) 787 baud = 921600; 788 else if (baud > 2000000) 789 baud = 2000000; 790 return baud; 791 } 792 793 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 794 { 795 int result; 796 797 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 798 if (result) { 799 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 800 return result; 801 } 802 803 /* Configure the termios structure */ 804 cp210x_get_termios(tty, port); 805 806 /* The baud rate must be initialised on cp2104 */ 807 if (tty) 808 cp210x_change_speed(tty, port, NULL); 809 810 return usb_serial_generic_open(tty, port); 811 } 812 813 static void cp210x_close(struct usb_serial_port *port) 814 { 815 usb_serial_generic_close(port); 816 817 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 818 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 819 820 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 821 } 822 823 /* 824 * Read how many bytes are waiting in the TX queue. 825 */ 826 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 827 u32 *count) 828 { 829 struct usb_serial *serial = port->serial; 830 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 831 struct cp210x_comm_status *sts; 832 int result; 833 834 sts = kmalloc(sizeof(*sts), GFP_KERNEL); 835 if (!sts) 836 return -ENOMEM; 837 838 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 839 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST, 840 0, port_priv->bInterfaceNumber, sts, sizeof(*sts), 841 USB_CTRL_GET_TIMEOUT); 842 if (result == sizeof(*sts)) { 843 *count = le32_to_cpu(sts->ulAmountInOutQueue); 844 result = 0; 845 } else { 846 dev_err(&port->dev, "failed to get comm status: %d\n", result); 847 if (result >= 0) 848 result = -EIO; 849 } 850 851 kfree(sts); 852 853 return result; 854 } 855 856 static bool cp210x_tx_empty(struct usb_serial_port *port) 857 { 858 int err; 859 u32 count; 860 861 err = cp210x_get_tx_queue_byte_count(port, &count); 862 if (err) 863 return true; 864 865 return !count; 866 } 867 868 /* 869 * cp210x_get_termios 870 * Reads the baud rate, data bits, parity, stop bits and flow control mode 871 * from the device, corrects any unsupported values, and configures the 872 * termios structure to reflect the state of the device 873 */ 874 static void cp210x_get_termios(struct tty_struct *tty, 875 struct usb_serial_port *port) 876 { 877 unsigned int baud; 878 879 if (tty) { 880 cp210x_get_termios_port(tty->driver_data, 881 &tty->termios.c_cflag, &baud); 882 tty_encode_baud_rate(tty, baud, baud); 883 } else { 884 tcflag_t cflag; 885 cflag = 0; 886 cp210x_get_termios_port(port, &cflag, &baud); 887 } 888 } 889 890 /* 891 * cp210x_get_termios_port 892 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port. 893 */ 894 static void cp210x_get_termios_port(struct usb_serial_port *port, 895 tcflag_t *cflagp, unsigned int *baudp) 896 { 897 struct device *dev = &port->dev; 898 tcflag_t cflag; 899 struct cp210x_flow_ctl flow_ctl; 900 u32 baud; 901 u16 bits; 902 u32 ctl_hs; 903 904 cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud); 905 906 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud); 907 *baudp = baud; 908 909 cflag = *cflagp; 910 911 cp210x_get_line_ctl(port, &bits); 912 cflag &= ~CSIZE; 913 switch (bits & BITS_DATA_MASK) { 914 case BITS_DATA_5: 915 dev_dbg(dev, "%s - data bits = 5\n", __func__); 916 cflag |= CS5; 917 break; 918 case BITS_DATA_6: 919 dev_dbg(dev, "%s - data bits = 6\n", __func__); 920 cflag |= CS6; 921 break; 922 case BITS_DATA_7: 923 dev_dbg(dev, "%s - data bits = 7\n", __func__); 924 cflag |= CS7; 925 break; 926 case BITS_DATA_8: 927 dev_dbg(dev, "%s - data bits = 8\n", __func__); 928 cflag |= CS8; 929 break; 930 case BITS_DATA_9: 931 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__); 932 cflag |= CS8; 933 bits &= ~BITS_DATA_MASK; 934 bits |= BITS_DATA_8; 935 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 936 break; 937 default: 938 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__); 939 cflag |= CS8; 940 bits &= ~BITS_DATA_MASK; 941 bits |= BITS_DATA_8; 942 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 943 break; 944 } 945 946 switch (bits & BITS_PARITY_MASK) { 947 case BITS_PARITY_NONE: 948 dev_dbg(dev, "%s - parity = NONE\n", __func__); 949 cflag &= ~PARENB; 950 break; 951 case BITS_PARITY_ODD: 952 dev_dbg(dev, "%s - parity = ODD\n", __func__); 953 cflag |= (PARENB|PARODD); 954 break; 955 case BITS_PARITY_EVEN: 956 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 957 cflag &= ~PARODD; 958 cflag |= PARENB; 959 break; 960 case BITS_PARITY_MARK: 961 dev_dbg(dev, "%s - parity = MARK\n", __func__); 962 cflag |= (PARENB|PARODD|CMSPAR); 963 break; 964 case BITS_PARITY_SPACE: 965 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 966 cflag &= ~PARODD; 967 cflag |= (PARENB|CMSPAR); 968 break; 969 default: 970 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__); 971 cflag &= ~PARENB; 972 bits &= ~BITS_PARITY_MASK; 973 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 974 break; 975 } 976 977 cflag &= ~CSTOPB; 978 switch (bits & BITS_STOP_MASK) { 979 case BITS_STOP_1: 980 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 981 break; 982 case BITS_STOP_1_5: 983 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__); 984 bits &= ~BITS_STOP_MASK; 985 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 986 break; 987 case BITS_STOP_2: 988 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 989 cflag |= CSTOPB; 990 break; 991 default: 992 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__); 993 bits &= ~BITS_STOP_MASK; 994 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 995 break; 996 } 997 998 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 999 sizeof(flow_ctl)); 1000 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1001 if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) { 1002 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 1003 cflag |= CRTSCTS; 1004 } else { 1005 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 1006 cflag &= ~CRTSCTS; 1007 } 1008 1009 *cflagp = cflag; 1010 } 1011 1012 /* 1013 * CP2101 supports the following baud rates: 1014 * 1015 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 1016 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 1017 * 1018 * CP2102 and CP2103 support the following additional rates: 1019 * 1020 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 1021 * 576000 1022 * 1023 * The device will map a requested rate to a supported one, but the result 1024 * of requests for rates greater than 1053257 is undefined (see AN205). 1025 * 1026 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 1027 * respectively, with an error less than 1%. The actual rates are determined 1028 * by 1029 * 1030 * div = round(freq / (2 x prescale x request)) 1031 * actual = freq / (2 x prescale x div) 1032 * 1033 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 1034 * or 1 otherwise. 1035 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 1036 * otherwise. 1037 */ 1038 static void cp210x_change_speed(struct tty_struct *tty, 1039 struct usb_serial_port *port, struct ktermios *old_termios) 1040 { 1041 u32 baud; 1042 1043 baud = tty->termios.c_ospeed; 1044 1045 /* This maps the requested rate to a rate valid on cp2102 or cp2103, 1046 * or to an arbitrary rate in [1M,2M]. 1047 * 1048 * NOTE: B0 is not implemented. 1049 */ 1050 baud = cp210x_quantise_baudrate(baud); 1051 1052 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 1053 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { 1054 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 1055 if (old_termios) 1056 baud = old_termios->c_ospeed; 1057 else 1058 baud = 9600; 1059 } 1060 1061 tty_encode_baud_rate(tty, baud, baud); 1062 } 1063 1064 static void cp210x_set_termios(struct tty_struct *tty, 1065 struct usb_serial_port *port, struct ktermios *old_termios) 1066 { 1067 struct device *dev = &port->dev; 1068 unsigned int cflag, old_cflag; 1069 u16 bits; 1070 1071 cflag = tty->termios.c_cflag; 1072 old_cflag = old_termios->c_cflag; 1073 1074 if (tty->termios.c_ospeed != old_termios->c_ospeed) 1075 cp210x_change_speed(tty, port, old_termios); 1076 1077 /* If the number of data bits is to be updated */ 1078 if ((cflag & CSIZE) != (old_cflag & CSIZE)) { 1079 cp210x_get_line_ctl(port, &bits); 1080 bits &= ~BITS_DATA_MASK; 1081 switch (cflag & CSIZE) { 1082 case CS5: 1083 bits |= BITS_DATA_5; 1084 dev_dbg(dev, "%s - data bits = 5\n", __func__); 1085 break; 1086 case CS6: 1087 bits |= BITS_DATA_6; 1088 dev_dbg(dev, "%s - data bits = 6\n", __func__); 1089 break; 1090 case CS7: 1091 bits |= BITS_DATA_7; 1092 dev_dbg(dev, "%s - data bits = 7\n", __func__); 1093 break; 1094 case CS8: 1095 default: 1096 bits |= BITS_DATA_8; 1097 dev_dbg(dev, "%s - data bits = 8\n", __func__); 1098 break; 1099 } 1100 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 1101 dev_dbg(dev, "Number of data bits requested not supported by device\n"); 1102 } 1103 1104 if ((cflag & (PARENB|PARODD|CMSPAR)) != 1105 (old_cflag & (PARENB|PARODD|CMSPAR))) { 1106 cp210x_get_line_ctl(port, &bits); 1107 bits &= ~BITS_PARITY_MASK; 1108 if (cflag & PARENB) { 1109 if (cflag & CMSPAR) { 1110 if (cflag & PARODD) { 1111 bits |= BITS_PARITY_MARK; 1112 dev_dbg(dev, "%s - parity = MARK\n", __func__); 1113 } else { 1114 bits |= BITS_PARITY_SPACE; 1115 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 1116 } 1117 } else { 1118 if (cflag & PARODD) { 1119 bits |= BITS_PARITY_ODD; 1120 dev_dbg(dev, "%s - parity = ODD\n", __func__); 1121 } else { 1122 bits |= BITS_PARITY_EVEN; 1123 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 1124 } 1125 } 1126 } 1127 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 1128 dev_dbg(dev, "Parity mode not supported by device\n"); 1129 } 1130 1131 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { 1132 cp210x_get_line_ctl(port, &bits); 1133 bits &= ~BITS_STOP_MASK; 1134 if (cflag & CSTOPB) { 1135 bits |= BITS_STOP_2; 1136 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 1137 } else { 1138 bits |= BITS_STOP_1; 1139 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 1140 } 1141 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 1142 dev_dbg(dev, "Number of stop bits requested not supported by device\n"); 1143 } 1144 1145 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 1146 struct cp210x_flow_ctl flow_ctl; 1147 u32 ctl_hs; 1148 u32 flow_repl; 1149 1150 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1151 sizeof(flow_ctl)); 1152 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1153 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1154 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n", 1155 __func__, ctl_hs, flow_repl); 1156 1157 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE; 1158 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE; 1159 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY; 1160 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1161 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE); 1162 if (cflag & CRTSCTS) { 1163 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE; 1164 1165 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1166 flow_repl |= CP210X_SERIAL_RTS_SHIFT( 1167 CP210X_SERIAL_RTS_FLOW_CTL); 1168 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 1169 } else { 1170 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE; 1171 1172 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1173 flow_repl |= CP210X_SERIAL_RTS_SHIFT( 1174 CP210X_SERIAL_RTS_ACTIVE); 1175 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 1176 } 1177 1178 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n", 1179 __func__, ctl_hs, flow_repl); 1180 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1181 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1182 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1183 sizeof(flow_ctl)); 1184 } 1185 1186 } 1187 1188 static int cp210x_tiocmset(struct tty_struct *tty, 1189 unsigned int set, unsigned int clear) 1190 { 1191 struct usb_serial_port *port = tty->driver_data; 1192 return cp210x_tiocmset_port(port, set, clear); 1193 } 1194 1195 static int cp210x_tiocmset_port(struct usb_serial_port *port, 1196 unsigned int set, unsigned int clear) 1197 { 1198 u16 control = 0; 1199 1200 if (set & TIOCM_RTS) { 1201 control |= CONTROL_RTS; 1202 control |= CONTROL_WRITE_RTS; 1203 } 1204 if (set & TIOCM_DTR) { 1205 control |= CONTROL_DTR; 1206 control |= CONTROL_WRITE_DTR; 1207 } 1208 if (clear & TIOCM_RTS) { 1209 control &= ~CONTROL_RTS; 1210 control |= CONTROL_WRITE_RTS; 1211 } 1212 if (clear & TIOCM_DTR) { 1213 control &= ~CONTROL_DTR; 1214 control |= CONTROL_WRITE_DTR; 1215 } 1216 1217 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control); 1218 1219 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1220 } 1221 1222 static void cp210x_dtr_rts(struct usb_serial_port *p, int on) 1223 { 1224 if (on) 1225 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0); 1226 else 1227 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS); 1228 } 1229 1230 static int cp210x_tiocmget(struct tty_struct *tty) 1231 { 1232 struct usb_serial_port *port = tty->driver_data; 1233 u8 control; 1234 int result; 1235 1236 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1237 if (result) 1238 return result; 1239 1240 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1241 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1242 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1243 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1244 |((control & CONTROL_RING)? TIOCM_RI : 0) 1245 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1246 1247 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control); 1248 1249 return result; 1250 } 1251 1252 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 1253 { 1254 struct usb_serial_port *port = tty->driver_data; 1255 u16 state; 1256 1257 if (break_state == 0) 1258 state = BREAK_OFF; 1259 else 1260 state = BREAK_ON; 1261 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1262 state == BREAK_OFF ? "off" : "on"); 1263 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1264 } 1265 1266 #ifdef CONFIG_GPIOLIB 1267 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset) 1268 { 1269 struct usb_serial *serial = gpiochip_get_data(gc); 1270 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1271 1272 switch (offset) { 1273 case 0: 1274 if (priv->config & CP2105_GPIO0_TXLED_MODE) 1275 return -ENODEV; 1276 break; 1277 case 1: 1278 if (priv->config & (CP2105_GPIO1_RXLED_MODE | 1279 CP2105_GPIO1_RS485_MODE)) 1280 return -ENODEV; 1281 break; 1282 } 1283 1284 return 0; 1285 } 1286 1287 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio) 1288 { 1289 struct usb_serial *serial = gpiochip_get_data(gc); 1290 int result; 1291 u8 buf; 1292 1293 result = cp210x_read_vendor_block(serial, REQTYPE_INTERFACE_TO_HOST, 1294 CP210X_READ_LATCH, &buf, sizeof(buf)); 1295 if (result < 0) 1296 return result; 1297 1298 return !!(buf & BIT(gpio)); 1299 } 1300 1301 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value) 1302 { 1303 struct usb_serial *serial = gpiochip_get_data(gc); 1304 struct cp210x_gpio_write buf; 1305 1306 if (value == 1) 1307 buf.state = BIT(gpio); 1308 else 1309 buf.state = 0; 1310 1311 buf.mask = BIT(gpio); 1312 1313 cp210x_write_vendor_block(serial, REQTYPE_HOST_TO_INTERFACE, 1314 CP210X_WRITE_LATCH, &buf, sizeof(buf)); 1315 } 1316 1317 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio) 1318 { 1319 /* Hardware does not support an input mode */ 1320 return 0; 1321 } 1322 1323 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio) 1324 { 1325 /* Hardware does not support an input mode */ 1326 return -ENOTSUPP; 1327 } 1328 1329 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio, 1330 int value) 1331 { 1332 return 0; 1333 } 1334 1335 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio, 1336 unsigned long config) 1337 { 1338 struct usb_serial *serial = gpiochip_get_data(gc); 1339 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1340 enum pin_config_param param = pinconf_to_config_param(config); 1341 1342 /* Succeed only if in correct mode (this can't be set at runtime) */ 1343 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) && 1344 (priv->gpio_mode & BIT(gpio))) 1345 return 0; 1346 1347 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) && 1348 !(priv->gpio_mode & BIT(gpio))) 1349 return 0; 1350 1351 return -ENOTSUPP; 1352 } 1353 1354 /* 1355 * This function is for configuring GPIO using shared pins, where other signals 1356 * are made unavailable by configuring the use of GPIO. This is believed to be 1357 * only applicable to the cp2105 at this point, the other devices supported by 1358 * this driver that provide GPIO do so in a way that does not impact other 1359 * signals and are thus expected to have very different initialisation. 1360 */ 1361 static int cp2105_shared_gpio_init(struct usb_serial *serial) 1362 { 1363 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1364 struct cp210x_pin_mode mode; 1365 struct cp210x_config config; 1366 u8 intf_num = cp210x_interface_num(serial); 1367 int result; 1368 1369 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1370 CP210X_GET_DEVICEMODE, &mode, 1371 sizeof(mode)); 1372 if (result < 0) 1373 return result; 1374 1375 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1376 CP210X_GET_PORTCONFIG, &config, 1377 sizeof(config)); 1378 if (result < 0) 1379 return result; 1380 1381 /* 2 banks of GPIO - One for the pins taken from each serial port */ 1382 if (intf_num == 0) { 1383 if (mode.eci == CP210X_PIN_MODE_MODEM) 1384 return 0; 1385 1386 priv->config = config.eci_cfg; 1387 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) & 1388 CP210X_ECI_GPIO_MODE_MASK) >> 1389 CP210X_ECI_GPIO_MODE_OFFSET); 1390 priv->gc.ngpio = 2; 1391 } else if (intf_num == 1) { 1392 if (mode.sci == CP210X_PIN_MODE_MODEM) 1393 return 0; 1394 1395 priv->config = config.sci_cfg; 1396 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) & 1397 CP210X_SCI_GPIO_MODE_MASK) >> 1398 CP210X_SCI_GPIO_MODE_OFFSET); 1399 priv->gc.ngpio = 3; 1400 } else { 1401 return -ENODEV; 1402 } 1403 1404 priv->gc.label = "cp210x"; 1405 priv->gc.request = cp210x_gpio_request; 1406 priv->gc.get_direction = cp210x_gpio_direction_get; 1407 priv->gc.direction_input = cp210x_gpio_direction_input; 1408 priv->gc.direction_output = cp210x_gpio_direction_output; 1409 priv->gc.get = cp210x_gpio_get; 1410 priv->gc.set = cp210x_gpio_set; 1411 priv->gc.set_config = cp210x_gpio_set_config; 1412 priv->gc.owner = THIS_MODULE; 1413 priv->gc.parent = &serial->interface->dev; 1414 priv->gc.base = -1; 1415 priv->gc.can_sleep = true; 1416 1417 result = gpiochip_add_data(&priv->gc, serial); 1418 if (!result) 1419 priv->gpio_registered = true; 1420 1421 return result; 1422 } 1423 1424 static void cp210x_gpio_remove(struct usb_serial *serial) 1425 { 1426 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1427 1428 if (priv->gpio_registered) { 1429 gpiochip_remove(&priv->gc); 1430 priv->gpio_registered = false; 1431 } 1432 } 1433 1434 #else 1435 1436 static int cp2105_shared_gpio_init(struct usb_serial *serial) 1437 { 1438 return 0; 1439 } 1440 1441 static void cp210x_gpio_remove(struct usb_serial *serial) 1442 { 1443 /* Nothing to do */ 1444 } 1445 1446 #endif 1447 1448 static int cp210x_port_probe(struct usb_serial_port *port) 1449 { 1450 struct usb_serial *serial = port->serial; 1451 struct cp210x_port_private *port_priv; 1452 int ret; 1453 1454 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 1455 if (!port_priv) 1456 return -ENOMEM; 1457 1458 port_priv->bInterfaceNumber = cp210x_interface_num(serial); 1459 1460 usb_set_serial_port_data(port, port_priv); 1461 1462 ret = cp210x_detect_swapped_line_ctl(port); 1463 if (ret) { 1464 kfree(port_priv); 1465 return ret; 1466 } 1467 1468 return 0; 1469 } 1470 1471 static int cp210x_port_remove(struct usb_serial_port *port) 1472 { 1473 struct cp210x_port_private *port_priv; 1474 1475 port_priv = usb_get_serial_port_data(port); 1476 kfree(port_priv); 1477 1478 return 0; 1479 } 1480 1481 static int cp210x_attach(struct usb_serial *serial) 1482 { 1483 int result; 1484 struct cp210x_serial_private *priv; 1485 1486 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1487 if (!priv) 1488 return -ENOMEM; 1489 1490 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1491 CP210X_GET_PARTNUM, &priv->partnum, 1492 sizeof(priv->partnum)); 1493 if (result < 0) 1494 goto err_free_priv; 1495 1496 usb_set_serial_data(serial, priv); 1497 1498 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1499 result = cp2105_shared_gpio_init(serial); 1500 if (result < 0) { 1501 dev_err(&serial->interface->dev, 1502 "GPIO initialisation failed, continuing without GPIO support\n"); 1503 } 1504 } 1505 1506 return 0; 1507 err_free_priv: 1508 kfree(priv); 1509 1510 return result; 1511 } 1512 1513 static void cp210x_disconnect(struct usb_serial *serial) 1514 { 1515 cp210x_gpio_remove(serial); 1516 } 1517 1518 static void cp210x_release(struct usb_serial *serial) 1519 { 1520 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1521 1522 cp210x_gpio_remove(serial); 1523 1524 kfree(priv); 1525 } 1526 1527 module_usb_serial_driver(serial_drivers, id_table); 1528 1529 MODULE_DESCRIPTION(DRIVER_DESC); 1530 MODULE_LICENSE("GPL"); 1531