1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Silicon Laboratories CP210x USB to RS232 serial adaptor driver 4 * 5 * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk) 6 * 7 * Support to set flow control line levels using TIOCMGET and TIOCMSET 8 * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow 9 * control thanks to Munir Nassar nassarmu@real-time.com 10 * 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/errno.h> 15 #include <linux/slab.h> 16 #include <linux/tty.h> 17 #include <linux/tty_flip.h> 18 #include <linux/module.h> 19 #include <linux/moduleparam.h> 20 #include <linux/usb.h> 21 #include <linux/uaccess.h> 22 #include <linux/usb/serial.h> 23 #include <linux/gpio/driver.h> 24 #include <linux/bitops.h> 25 #include <linux/mutex.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 tcflag_t *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_attach(struct usb_serial *); 48 static void cp210x_disconnect(struct usb_serial *); 49 static void cp210x_release(struct usb_serial *); 50 static int cp210x_port_probe(struct usb_serial_port *); 51 static int cp210x_port_remove(struct usb_serial_port *); 52 static void cp210x_dtr_rts(struct usb_serial_port *p, int on); 53 54 static const struct usb_device_id id_table[] = { 55 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */ 56 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */ 57 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 58 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 59 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */ 60 { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */ 61 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */ 62 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */ 63 { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */ 64 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */ 65 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */ 66 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */ 67 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */ 68 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */ 69 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */ 70 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */ 71 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */ 72 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */ 73 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */ 74 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */ 75 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */ 76 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */ 77 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */ 78 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */ 79 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */ 80 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */ 81 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */ 82 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */ 83 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */ 84 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */ 85 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */ 86 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */ 87 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */ 88 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */ 89 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */ 90 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */ 91 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */ 92 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */ 93 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */ 94 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */ 95 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */ 96 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */ 97 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */ 98 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */ 99 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */ 100 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */ 101 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */ 102 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */ 103 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */ 104 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */ 105 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */ 106 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */ 107 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */ 108 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */ 109 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */ 110 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */ 111 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */ 112 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */ 113 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */ 114 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */ 115 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */ 116 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */ 117 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */ 118 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */ 119 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */ 120 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */ 121 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ 122 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ 123 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 124 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */ 125 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ 126 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */ 127 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */ 128 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ 129 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ 130 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */ 131 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 132 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 133 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */ 134 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */ 135 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */ 136 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */ 137 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */ 138 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */ 139 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */ 140 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */ 141 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */ 142 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */ 143 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */ 144 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 145 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 146 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 147 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 148 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 149 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 150 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 151 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 152 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 153 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 154 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */ 155 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */ 156 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 157 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 158 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */ 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(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */ 180 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */ 181 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */ 182 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */ 183 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */ 184 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */ 185 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */ 186 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */ 187 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */ 188 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */ 189 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */ 190 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 191 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */ 192 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 193 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 194 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 195 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 196 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 197 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 198 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 199 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 200 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 201 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 202 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 203 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 204 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 205 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 206 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 207 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 208 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 209 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 210 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 211 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 212 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 213 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */ 214 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 215 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 216 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 217 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */ 218 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 219 { } /* Terminating Entry */ 220 }; 221 222 MODULE_DEVICE_TABLE(usb, id_table); 223 224 struct cp210x_serial_private { 225 #ifdef CONFIG_GPIOLIB 226 struct gpio_chip gc; 227 u8 config; 228 u8 gpio_mode; 229 bool gpio_registered; 230 #endif 231 u8 partnum; 232 speed_t max_speed; 233 bool use_actual_rate; 234 }; 235 236 struct cp210x_port_private { 237 __u8 bInterfaceNumber; 238 bool has_swapped_line_ctl; 239 }; 240 241 static struct usb_serial_driver cp210x_device = { 242 .driver = { 243 .owner = THIS_MODULE, 244 .name = "cp210x", 245 }, 246 .id_table = id_table, 247 .num_ports = 1, 248 .bulk_in_size = 256, 249 .bulk_out_size = 256, 250 .open = cp210x_open, 251 .close = cp210x_close, 252 .break_ctl = cp210x_break_ctl, 253 .set_termios = cp210x_set_termios, 254 .tx_empty = cp210x_tx_empty, 255 .tiocmget = cp210x_tiocmget, 256 .tiocmset = cp210x_tiocmset, 257 .attach = cp210x_attach, 258 .disconnect = cp210x_disconnect, 259 .release = cp210x_release, 260 .port_probe = cp210x_port_probe, 261 .port_remove = cp210x_port_remove, 262 .dtr_rts = cp210x_dtr_rts 263 }; 264 265 static struct usb_serial_driver * const serial_drivers[] = { 266 &cp210x_device, NULL 267 }; 268 269 /* Config request types */ 270 #define REQTYPE_HOST_TO_INTERFACE 0x41 271 #define REQTYPE_INTERFACE_TO_HOST 0xc1 272 #define REQTYPE_HOST_TO_DEVICE 0x40 273 #define REQTYPE_DEVICE_TO_HOST 0xc0 274 275 /* Config request codes */ 276 #define CP210X_IFC_ENABLE 0x00 277 #define CP210X_SET_BAUDDIV 0x01 278 #define CP210X_GET_BAUDDIV 0x02 279 #define CP210X_SET_LINE_CTL 0x03 280 #define CP210X_GET_LINE_CTL 0x04 281 #define CP210X_SET_BREAK 0x05 282 #define CP210X_IMM_CHAR 0x06 283 #define CP210X_SET_MHS 0x07 284 #define CP210X_GET_MDMSTS 0x08 285 #define CP210X_SET_XON 0x09 286 #define CP210X_SET_XOFF 0x0A 287 #define CP210X_SET_EVENTMASK 0x0B 288 #define CP210X_GET_EVENTMASK 0x0C 289 #define CP210X_SET_CHAR 0x0D 290 #define CP210X_GET_CHARS 0x0E 291 #define CP210X_GET_PROPS 0x0F 292 #define CP210X_GET_COMM_STATUS 0x10 293 #define CP210X_RESET 0x11 294 #define CP210X_PURGE 0x12 295 #define CP210X_SET_FLOW 0x13 296 #define CP210X_GET_FLOW 0x14 297 #define CP210X_EMBED_EVENTS 0x15 298 #define CP210X_GET_EVENTSTATE 0x16 299 #define CP210X_SET_CHARS 0x19 300 #define CP210X_GET_BAUDRATE 0x1D 301 #define CP210X_SET_BAUDRATE 0x1E 302 #define CP210X_VENDOR_SPECIFIC 0xFF 303 304 /* CP210X_IFC_ENABLE */ 305 #define UART_ENABLE 0x0001 306 #define UART_DISABLE 0x0000 307 308 /* CP210X_(SET|GET)_BAUDDIV */ 309 #define BAUD_RATE_GEN_FREQ 0x384000 310 311 /* CP210X_(SET|GET)_LINE_CTL */ 312 #define BITS_DATA_MASK 0X0f00 313 #define BITS_DATA_5 0X0500 314 #define BITS_DATA_6 0X0600 315 #define BITS_DATA_7 0X0700 316 #define BITS_DATA_8 0X0800 317 #define BITS_DATA_9 0X0900 318 319 #define BITS_PARITY_MASK 0x00f0 320 #define BITS_PARITY_NONE 0x0000 321 #define BITS_PARITY_ODD 0x0010 322 #define BITS_PARITY_EVEN 0x0020 323 #define BITS_PARITY_MARK 0x0030 324 #define BITS_PARITY_SPACE 0x0040 325 326 #define BITS_STOP_MASK 0x000f 327 #define BITS_STOP_1 0x0000 328 #define BITS_STOP_1_5 0x0001 329 #define BITS_STOP_2 0x0002 330 331 /* CP210X_SET_BREAK */ 332 #define BREAK_ON 0x0001 333 #define BREAK_OFF 0x0000 334 335 /* CP210X_(SET_MHS|GET_MDMSTS) */ 336 #define CONTROL_DTR 0x0001 337 #define CONTROL_RTS 0x0002 338 #define CONTROL_CTS 0x0010 339 #define CONTROL_DSR 0x0020 340 #define CONTROL_RING 0x0040 341 #define CONTROL_DCD 0x0080 342 #define CONTROL_WRITE_DTR 0x0100 343 #define CONTROL_WRITE_RTS 0x0200 344 345 /* CP210X_VENDOR_SPECIFIC values */ 346 #define CP210X_READ_LATCH 0x00C2 347 #define CP210X_GET_PARTNUM 0x370B 348 #define CP210X_GET_PORTCONFIG 0x370C 349 #define CP210X_GET_DEVICEMODE 0x3711 350 #define CP210X_WRITE_LATCH 0x37E1 351 352 /* Part number definitions */ 353 #define CP210X_PARTNUM_CP2101 0x01 354 #define CP210X_PARTNUM_CP2102 0x02 355 #define CP210X_PARTNUM_CP2103 0x03 356 #define CP210X_PARTNUM_CP2104 0x04 357 #define CP210X_PARTNUM_CP2105 0x05 358 #define CP210X_PARTNUM_CP2108 0x08 359 #define CP210X_PARTNUM_CP2102N_QFN28 0x20 360 #define CP210X_PARTNUM_CP2102N_QFN24 0x21 361 #define CP210X_PARTNUM_CP2102N_QFN20 0x22 362 #define CP210X_PARTNUM_UNKNOWN 0xFF 363 364 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 365 struct cp210x_comm_status { 366 __le32 ulErrors; 367 __le32 ulHoldReasons; 368 __le32 ulAmountInInQueue; 369 __le32 ulAmountInOutQueue; 370 u8 bEofReceived; 371 u8 bWaitForImmediate; 372 u8 bReserved; 373 } __packed; 374 375 /* 376 * CP210X_PURGE - 16 bits passed in wValue of USB request. 377 * SiLabs app note AN571 gives a strange description of the 4 bits: 378 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 379 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 380 */ 381 #define PURGE_ALL 0x000f 382 383 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */ 384 struct cp210x_flow_ctl { 385 __le32 ulControlHandshake; 386 __le32 ulFlowReplace; 387 __le32 ulXonLimit; 388 __le32 ulXoffLimit; 389 } __packed; 390 391 /* cp210x_flow_ctl::ulControlHandshake */ 392 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0) 393 #define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode) 394 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3) 395 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4) 396 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5) 397 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6) 398 399 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */ 400 #define CP210X_SERIAL_DTR_INACTIVE 0 401 #define CP210X_SERIAL_DTR_ACTIVE 1 402 #define CP210X_SERIAL_DTR_FLOW_CTL 2 403 404 /* cp210x_flow_ctl::ulFlowReplace */ 405 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0) 406 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1) 407 #define CP210X_SERIAL_ERROR_CHAR BIT(2) 408 #define CP210X_SERIAL_NULL_STRIPPING BIT(3) 409 #define CP210X_SERIAL_BREAK_CHAR BIT(4) 410 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6) 411 #define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6) 412 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31) 413 414 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */ 415 #define CP210X_SERIAL_RTS_INACTIVE 0 416 #define CP210X_SERIAL_RTS_ACTIVE 1 417 #define CP210X_SERIAL_RTS_FLOW_CTL 2 418 419 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */ 420 struct cp210x_pin_mode { 421 u8 eci; 422 u8 sci; 423 } __packed; 424 425 #define CP210X_PIN_MODE_MODEM 0 426 #define CP210X_PIN_MODE_GPIO BIT(0) 427 428 /* 429 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes. 430 * Structure needs padding due to unused/unspecified bytes. 431 */ 432 struct cp210x_config { 433 __le16 gpio_mode; 434 u8 __pad0[2]; 435 __le16 reset_state; 436 u8 __pad1[4]; 437 __le16 suspend_state; 438 u8 sci_cfg; 439 u8 eci_cfg; 440 u8 device_cfg; 441 } __packed; 442 443 /* GPIO modes */ 444 #define CP210X_SCI_GPIO_MODE_OFFSET 9 445 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9) 446 447 #define CP210X_ECI_GPIO_MODE_OFFSET 2 448 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2) 449 450 /* CP2105 port configuration values */ 451 #define CP2105_GPIO0_TXLED_MODE BIT(0) 452 #define CP2105_GPIO1_RXLED_MODE BIT(1) 453 #define CP2105_GPIO1_RS485_MODE BIT(2) 454 455 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */ 456 struct cp210x_gpio_write { 457 u8 mask; 458 u8 state; 459 } __packed; 460 461 /* 462 * Helper to get interface number when we only have struct usb_serial. 463 */ 464 static u8 cp210x_interface_num(struct usb_serial *serial) 465 { 466 struct usb_host_interface *cur_altsetting; 467 468 cur_altsetting = serial->interface->cur_altsetting; 469 470 return cur_altsetting->desc.bInterfaceNumber; 471 } 472 473 /* 474 * Reads a variable-sized block of CP210X_ registers, identified by req. 475 * Returns data into buf in native USB byte order. 476 */ 477 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, 478 void *buf, int bufsize) 479 { 480 struct usb_serial *serial = port->serial; 481 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 482 void *dmabuf; 483 int result; 484 485 dmabuf = kmalloc(bufsize, GFP_KERNEL); 486 if (!dmabuf) { 487 /* 488 * FIXME Some callers don't bother to check for error, 489 * at least give them consistent junk until they are fixed 490 */ 491 memset(buf, 0, bufsize); 492 return -ENOMEM; 493 } 494 495 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 496 req, REQTYPE_INTERFACE_TO_HOST, 0, 497 port_priv->bInterfaceNumber, dmabuf, bufsize, 498 USB_CTRL_SET_TIMEOUT); 499 if (result == bufsize) { 500 memcpy(buf, dmabuf, bufsize); 501 result = 0; 502 } else { 503 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", 504 req, bufsize, result); 505 if (result >= 0) 506 result = -EIO; 507 508 /* 509 * FIXME Some callers don't bother to check for error, 510 * at least give them consistent junk until they are fixed 511 */ 512 memset(buf, 0, bufsize); 513 } 514 515 kfree(dmabuf); 516 517 return result; 518 } 519 520 /* 521 * Reads any 32-bit CP210X_ register identified by req. 522 */ 523 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val) 524 { 525 __le32 le32_val; 526 int err; 527 528 err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val)); 529 if (err) { 530 /* 531 * FIXME Some callers don't bother to check for error, 532 * at least give them consistent junk until they are fixed 533 */ 534 *val = 0; 535 return err; 536 } 537 538 *val = le32_to_cpu(le32_val); 539 540 return 0; 541 } 542 543 /* 544 * Reads any 16-bit CP210X_ register identified by req. 545 */ 546 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val) 547 { 548 __le16 le16_val; 549 int err; 550 551 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val)); 552 if (err) 553 return err; 554 555 *val = le16_to_cpu(le16_val); 556 557 return 0; 558 } 559 560 /* 561 * Reads any 8-bit CP210X_ register identified by req. 562 */ 563 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val) 564 { 565 return cp210x_read_reg_block(port, req, val, sizeof(*val)); 566 } 567 568 /* 569 * Reads a variable-sized vendor block of CP210X_ registers, identified by val. 570 * Returns data into buf in native USB byte order. 571 */ 572 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val, 573 void *buf, int bufsize) 574 { 575 void *dmabuf; 576 int result; 577 578 dmabuf = kmalloc(bufsize, GFP_KERNEL); 579 if (!dmabuf) 580 return -ENOMEM; 581 582 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 583 CP210X_VENDOR_SPECIFIC, type, val, 584 cp210x_interface_num(serial), dmabuf, bufsize, 585 USB_CTRL_GET_TIMEOUT); 586 if (result == bufsize) { 587 memcpy(buf, dmabuf, bufsize); 588 result = 0; 589 } else { 590 dev_err(&serial->interface->dev, 591 "failed to get vendor val 0x%04x size %d: %d\n", val, 592 bufsize, result); 593 if (result >= 0) 594 result = -EIO; 595 } 596 597 kfree(dmabuf); 598 599 return result; 600 } 601 602 /* 603 * Writes any 16-bit CP210X_ register (req) whose value is passed 604 * entirely in the wValue field of the USB request. 605 */ 606 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) 607 { 608 struct usb_serial *serial = port->serial; 609 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 610 int result; 611 612 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 613 req, REQTYPE_HOST_TO_INTERFACE, val, 614 port_priv->bInterfaceNumber, NULL, 0, 615 USB_CTRL_SET_TIMEOUT); 616 if (result < 0) { 617 dev_err(&port->dev, "failed set request 0x%x status: %d\n", 618 req, result); 619 } 620 621 return result; 622 } 623 624 /* 625 * Writes a variable-sized block of CP210X_ registers, identified by req. 626 * Data in buf must be in native USB byte order. 627 */ 628 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req, 629 void *buf, int bufsize) 630 { 631 struct usb_serial *serial = port->serial; 632 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 633 void *dmabuf; 634 int result; 635 636 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 637 if (!dmabuf) 638 return -ENOMEM; 639 640 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 641 req, REQTYPE_HOST_TO_INTERFACE, 0, 642 port_priv->bInterfaceNumber, dmabuf, bufsize, 643 USB_CTRL_SET_TIMEOUT); 644 645 kfree(dmabuf); 646 647 if (result == bufsize) { 648 result = 0; 649 } else { 650 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", 651 req, bufsize, result); 652 if (result >= 0) 653 result = -EIO; 654 } 655 656 return result; 657 } 658 659 /* 660 * Writes any 32-bit CP210X_ register identified by req. 661 */ 662 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) 663 { 664 __le32 le32_val; 665 666 le32_val = cpu_to_le32(val); 667 668 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); 669 } 670 671 #ifdef CONFIG_GPIOLIB 672 /* 673 * Writes a variable-sized vendor block of CP210X_ registers, identified by val. 674 * Data in buf must be in native USB byte order. 675 */ 676 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type, 677 u16 val, void *buf, int bufsize) 678 { 679 void *dmabuf; 680 int result; 681 682 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 683 if (!dmabuf) 684 return -ENOMEM; 685 686 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 687 CP210X_VENDOR_SPECIFIC, type, val, 688 cp210x_interface_num(serial), dmabuf, bufsize, 689 USB_CTRL_SET_TIMEOUT); 690 691 kfree(dmabuf); 692 693 if (result == bufsize) { 694 result = 0; 695 } else { 696 dev_err(&serial->interface->dev, 697 "failed to set vendor val 0x%04x size %d: %d\n", val, 698 bufsize, result); 699 if (result >= 0) 700 result = -EIO; 701 } 702 703 return result; 704 } 705 #endif 706 707 /* 708 * Detect CP2108 GET_LINE_CTL bug and activate workaround. 709 * Write a known good value 0x800, read it back. 710 * If it comes back swapped the bug is detected. 711 * Preserve the original register value. 712 */ 713 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port) 714 { 715 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 716 u16 line_ctl_save; 717 u16 line_ctl_test; 718 int err; 719 720 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save); 721 if (err) 722 return err; 723 724 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800); 725 if (err) 726 return err; 727 728 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test); 729 if (err) 730 return err; 731 732 if (line_ctl_test == 8) { 733 port_priv->has_swapped_line_ctl = true; 734 line_ctl_save = swab16(line_ctl_save); 735 } 736 737 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save); 738 } 739 740 /* 741 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL) 742 * to workaround cp2108 bug and get correct value. 743 */ 744 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl) 745 { 746 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 747 int err; 748 749 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl); 750 if (err) 751 return err; 752 753 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */ 754 if (port_priv->has_swapped_line_ctl) 755 *ctl = swab16(*ctl); 756 757 return 0; 758 } 759 760 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 761 { 762 int result; 763 764 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 765 if (result) { 766 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 767 return result; 768 } 769 770 /* Configure the termios structure */ 771 cp210x_get_termios(tty, port); 772 773 /* The baud rate must be initialised on cp2104 */ 774 if (tty) 775 cp210x_change_speed(tty, port, NULL); 776 777 return usb_serial_generic_open(tty, port); 778 } 779 780 static void cp210x_close(struct usb_serial_port *port) 781 { 782 usb_serial_generic_close(port); 783 784 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 785 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 786 787 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 788 } 789 790 /* 791 * Read how many bytes are waiting in the TX queue. 792 */ 793 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 794 u32 *count) 795 { 796 struct usb_serial *serial = port->serial; 797 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 798 struct cp210x_comm_status *sts; 799 int result; 800 801 sts = kmalloc(sizeof(*sts), GFP_KERNEL); 802 if (!sts) 803 return -ENOMEM; 804 805 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 806 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST, 807 0, port_priv->bInterfaceNumber, sts, sizeof(*sts), 808 USB_CTRL_GET_TIMEOUT); 809 if (result == sizeof(*sts)) { 810 *count = le32_to_cpu(sts->ulAmountInOutQueue); 811 result = 0; 812 } else { 813 dev_err(&port->dev, "failed to get comm status: %d\n", result); 814 if (result >= 0) 815 result = -EIO; 816 } 817 818 kfree(sts); 819 820 return result; 821 } 822 823 static bool cp210x_tx_empty(struct usb_serial_port *port) 824 { 825 int err; 826 u32 count; 827 828 err = cp210x_get_tx_queue_byte_count(port, &count); 829 if (err) 830 return true; 831 832 return !count; 833 } 834 835 /* 836 * cp210x_get_termios 837 * Reads the baud rate, data bits, parity, stop bits and flow control mode 838 * from the device, corrects any unsupported values, and configures the 839 * termios structure to reflect the state of the device 840 */ 841 static void cp210x_get_termios(struct tty_struct *tty, 842 struct usb_serial_port *port) 843 { 844 unsigned int baud; 845 846 if (tty) { 847 cp210x_get_termios_port(tty->driver_data, 848 &tty->termios.c_cflag, &baud); 849 tty_encode_baud_rate(tty, baud, baud); 850 } else { 851 tcflag_t cflag; 852 cflag = 0; 853 cp210x_get_termios_port(port, &cflag, &baud); 854 } 855 } 856 857 /* 858 * cp210x_get_termios_port 859 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port. 860 */ 861 static void cp210x_get_termios_port(struct usb_serial_port *port, 862 tcflag_t *cflagp, unsigned int *baudp) 863 { 864 struct device *dev = &port->dev; 865 tcflag_t cflag; 866 struct cp210x_flow_ctl flow_ctl; 867 u32 baud; 868 u16 bits; 869 u32 ctl_hs; 870 871 cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud); 872 873 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud); 874 *baudp = baud; 875 876 cflag = *cflagp; 877 878 cp210x_get_line_ctl(port, &bits); 879 cflag &= ~CSIZE; 880 switch (bits & BITS_DATA_MASK) { 881 case BITS_DATA_5: 882 dev_dbg(dev, "%s - data bits = 5\n", __func__); 883 cflag |= CS5; 884 break; 885 case BITS_DATA_6: 886 dev_dbg(dev, "%s - data bits = 6\n", __func__); 887 cflag |= CS6; 888 break; 889 case BITS_DATA_7: 890 dev_dbg(dev, "%s - data bits = 7\n", __func__); 891 cflag |= CS7; 892 break; 893 case BITS_DATA_8: 894 dev_dbg(dev, "%s - data bits = 8\n", __func__); 895 cflag |= CS8; 896 break; 897 case BITS_DATA_9: 898 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__); 899 cflag |= CS8; 900 bits &= ~BITS_DATA_MASK; 901 bits |= BITS_DATA_8; 902 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 903 break; 904 default: 905 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__); 906 cflag |= CS8; 907 bits &= ~BITS_DATA_MASK; 908 bits |= BITS_DATA_8; 909 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 910 break; 911 } 912 913 switch (bits & BITS_PARITY_MASK) { 914 case BITS_PARITY_NONE: 915 dev_dbg(dev, "%s - parity = NONE\n", __func__); 916 cflag &= ~PARENB; 917 break; 918 case BITS_PARITY_ODD: 919 dev_dbg(dev, "%s - parity = ODD\n", __func__); 920 cflag |= (PARENB|PARODD); 921 break; 922 case BITS_PARITY_EVEN: 923 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 924 cflag &= ~PARODD; 925 cflag |= PARENB; 926 break; 927 case BITS_PARITY_MARK: 928 dev_dbg(dev, "%s - parity = MARK\n", __func__); 929 cflag |= (PARENB|PARODD|CMSPAR); 930 break; 931 case BITS_PARITY_SPACE: 932 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 933 cflag &= ~PARODD; 934 cflag |= (PARENB|CMSPAR); 935 break; 936 default: 937 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__); 938 cflag &= ~PARENB; 939 bits &= ~BITS_PARITY_MASK; 940 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 941 break; 942 } 943 944 cflag &= ~CSTOPB; 945 switch (bits & BITS_STOP_MASK) { 946 case BITS_STOP_1: 947 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 948 break; 949 case BITS_STOP_1_5: 950 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__); 951 bits &= ~BITS_STOP_MASK; 952 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 953 break; 954 case BITS_STOP_2: 955 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 956 cflag |= CSTOPB; 957 break; 958 default: 959 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__); 960 bits &= ~BITS_STOP_MASK; 961 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 962 break; 963 } 964 965 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 966 sizeof(flow_ctl)); 967 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 968 if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) { 969 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 970 cflag |= CRTSCTS; 971 } else { 972 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 973 cflag &= ~CRTSCTS; 974 } 975 976 *cflagp = cflag; 977 } 978 979 struct cp210x_rate { 980 speed_t rate; 981 speed_t high; 982 }; 983 984 static const struct cp210x_rate cp210x_an205_table1[] = { 985 { 300, 300 }, 986 { 600, 600 }, 987 { 1200, 1200 }, 988 { 1800, 1800 }, 989 { 2400, 2400 }, 990 { 4000, 4000 }, 991 { 4800, 4803 }, 992 { 7200, 7207 }, 993 { 9600, 9612 }, 994 { 14400, 14428 }, 995 { 16000, 16062 }, 996 { 19200, 19250 }, 997 { 28800, 28912 }, 998 { 38400, 38601 }, 999 { 51200, 51558 }, 1000 { 56000, 56280 }, 1001 { 57600, 58053 }, 1002 { 64000, 64111 }, 1003 { 76800, 77608 }, 1004 { 115200, 117028 }, 1005 { 128000, 129347 }, 1006 { 153600, 156868 }, 1007 { 230400, 237832 }, 1008 { 250000, 254234 }, 1009 { 256000, 273066 }, 1010 { 460800, 491520 }, 1011 { 500000, 567138 }, 1012 { 576000, 670254 }, 1013 { 921600, UINT_MAX } 1014 }; 1015 1016 /* 1017 * Quantises the baud rate as per AN205 Table 1 1018 */ 1019 static speed_t cp210x_get_an205_rate(speed_t baud) 1020 { 1021 int i; 1022 1023 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) { 1024 if (baud <= cp210x_an205_table1[i].high) 1025 break; 1026 } 1027 1028 return cp210x_an205_table1[i].rate; 1029 } 1030 1031 static speed_t cp210x_get_actual_rate(struct usb_serial *serial, speed_t baud) 1032 { 1033 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1034 unsigned int prescale = 1; 1035 unsigned int div; 1036 1037 baud = clamp(baud, 300u, priv->max_speed); 1038 1039 if (baud <= 365) 1040 prescale = 4; 1041 1042 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud); 1043 baud = 48000000 / (2 * prescale * div); 1044 1045 return baud; 1046 } 1047 1048 /* 1049 * CP2101 supports the following baud rates: 1050 * 1051 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 1052 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 1053 * 1054 * CP2102 and CP2103 support the following additional rates: 1055 * 1056 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 1057 * 576000 1058 * 1059 * The device will map a requested rate to a supported one, but the result 1060 * of requests for rates greater than 1053257 is undefined (see AN205). 1061 * 1062 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 1063 * respectively, with an error less than 1%. The actual rates are determined 1064 * by 1065 * 1066 * div = round(freq / (2 x prescale x request)) 1067 * actual = freq / (2 x prescale x div) 1068 * 1069 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 1070 * or 1 otherwise. 1071 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 1072 * otherwise. 1073 */ 1074 static void cp210x_change_speed(struct tty_struct *tty, 1075 struct usb_serial_port *port, struct ktermios *old_termios) 1076 { 1077 struct usb_serial *serial = port->serial; 1078 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1079 u32 baud; 1080 1081 baud = tty->termios.c_ospeed; 1082 1083 /* 1084 * This maps the requested rate to the actual rate, a valid rate on 1085 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed]. 1086 * 1087 * NOTE: B0 is not implemented. 1088 */ 1089 if (priv->use_actual_rate) 1090 baud = cp210x_get_actual_rate(serial, baud); 1091 else if (baud < 1000000) 1092 baud = cp210x_get_an205_rate(baud); 1093 else if (baud > priv->max_speed) 1094 baud = priv->max_speed; 1095 1096 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 1097 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { 1098 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 1099 if (old_termios) 1100 baud = old_termios->c_ospeed; 1101 else 1102 baud = 9600; 1103 } 1104 1105 tty_encode_baud_rate(tty, baud, baud); 1106 } 1107 1108 static void cp210x_set_termios(struct tty_struct *tty, 1109 struct usb_serial_port *port, struct ktermios *old_termios) 1110 { 1111 struct device *dev = &port->dev; 1112 unsigned int cflag, old_cflag; 1113 u16 bits; 1114 1115 cflag = tty->termios.c_cflag; 1116 old_cflag = old_termios->c_cflag; 1117 1118 if (tty->termios.c_ospeed != old_termios->c_ospeed) 1119 cp210x_change_speed(tty, port, old_termios); 1120 1121 /* If the number of data bits is to be updated */ 1122 if ((cflag & CSIZE) != (old_cflag & CSIZE)) { 1123 cp210x_get_line_ctl(port, &bits); 1124 bits &= ~BITS_DATA_MASK; 1125 switch (cflag & CSIZE) { 1126 case CS5: 1127 bits |= BITS_DATA_5; 1128 dev_dbg(dev, "%s - data bits = 5\n", __func__); 1129 break; 1130 case CS6: 1131 bits |= BITS_DATA_6; 1132 dev_dbg(dev, "%s - data bits = 6\n", __func__); 1133 break; 1134 case CS7: 1135 bits |= BITS_DATA_7; 1136 dev_dbg(dev, "%s - data bits = 7\n", __func__); 1137 break; 1138 case CS8: 1139 default: 1140 bits |= BITS_DATA_8; 1141 dev_dbg(dev, "%s - data bits = 8\n", __func__); 1142 break; 1143 } 1144 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 1145 dev_dbg(dev, "Number of data bits requested not supported by device\n"); 1146 } 1147 1148 if ((cflag & (PARENB|PARODD|CMSPAR)) != 1149 (old_cflag & (PARENB|PARODD|CMSPAR))) { 1150 cp210x_get_line_ctl(port, &bits); 1151 bits &= ~BITS_PARITY_MASK; 1152 if (cflag & PARENB) { 1153 if (cflag & CMSPAR) { 1154 if (cflag & PARODD) { 1155 bits |= BITS_PARITY_MARK; 1156 dev_dbg(dev, "%s - parity = MARK\n", __func__); 1157 } else { 1158 bits |= BITS_PARITY_SPACE; 1159 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 1160 } 1161 } else { 1162 if (cflag & PARODD) { 1163 bits |= BITS_PARITY_ODD; 1164 dev_dbg(dev, "%s - parity = ODD\n", __func__); 1165 } else { 1166 bits |= BITS_PARITY_EVEN; 1167 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 1168 } 1169 } 1170 } 1171 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 1172 dev_dbg(dev, "Parity mode not supported by device\n"); 1173 } 1174 1175 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { 1176 cp210x_get_line_ctl(port, &bits); 1177 bits &= ~BITS_STOP_MASK; 1178 if (cflag & CSTOPB) { 1179 bits |= BITS_STOP_2; 1180 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 1181 } else { 1182 bits |= BITS_STOP_1; 1183 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 1184 } 1185 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 1186 dev_dbg(dev, "Number of stop bits requested not supported by device\n"); 1187 } 1188 1189 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 1190 struct cp210x_flow_ctl flow_ctl; 1191 u32 ctl_hs; 1192 u32 flow_repl; 1193 1194 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1195 sizeof(flow_ctl)); 1196 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1197 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1198 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n", 1199 __func__, ctl_hs, flow_repl); 1200 1201 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE; 1202 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE; 1203 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY; 1204 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1205 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE); 1206 if (cflag & CRTSCTS) { 1207 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE; 1208 1209 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1210 flow_repl |= CP210X_SERIAL_RTS_SHIFT( 1211 CP210X_SERIAL_RTS_FLOW_CTL); 1212 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 1213 } else { 1214 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE; 1215 1216 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1217 flow_repl |= CP210X_SERIAL_RTS_SHIFT( 1218 CP210X_SERIAL_RTS_ACTIVE); 1219 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 1220 } 1221 1222 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n", 1223 __func__, ctl_hs, flow_repl); 1224 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1225 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1226 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1227 sizeof(flow_ctl)); 1228 } 1229 1230 } 1231 1232 static int cp210x_tiocmset(struct tty_struct *tty, 1233 unsigned int set, unsigned int clear) 1234 { 1235 struct usb_serial_port *port = tty->driver_data; 1236 return cp210x_tiocmset_port(port, set, clear); 1237 } 1238 1239 static int cp210x_tiocmset_port(struct usb_serial_port *port, 1240 unsigned int set, unsigned int clear) 1241 { 1242 u16 control = 0; 1243 1244 if (set & TIOCM_RTS) { 1245 control |= CONTROL_RTS; 1246 control |= CONTROL_WRITE_RTS; 1247 } 1248 if (set & TIOCM_DTR) { 1249 control |= CONTROL_DTR; 1250 control |= CONTROL_WRITE_DTR; 1251 } 1252 if (clear & TIOCM_RTS) { 1253 control &= ~CONTROL_RTS; 1254 control |= CONTROL_WRITE_RTS; 1255 } 1256 if (clear & TIOCM_DTR) { 1257 control &= ~CONTROL_DTR; 1258 control |= CONTROL_WRITE_DTR; 1259 } 1260 1261 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control); 1262 1263 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1264 } 1265 1266 static void cp210x_dtr_rts(struct usb_serial_port *p, int on) 1267 { 1268 if (on) 1269 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0); 1270 else 1271 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS); 1272 } 1273 1274 static int cp210x_tiocmget(struct tty_struct *tty) 1275 { 1276 struct usb_serial_port *port = tty->driver_data; 1277 u8 control; 1278 int result; 1279 1280 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1281 if (result) 1282 return result; 1283 1284 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1285 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1286 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1287 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1288 |((control & CONTROL_RING)? TIOCM_RI : 0) 1289 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1290 1291 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control); 1292 1293 return result; 1294 } 1295 1296 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 1297 { 1298 struct usb_serial_port *port = tty->driver_data; 1299 u16 state; 1300 1301 if (break_state == 0) 1302 state = BREAK_OFF; 1303 else 1304 state = BREAK_ON; 1305 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1306 state == BREAK_OFF ? "off" : "on"); 1307 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1308 } 1309 1310 #ifdef CONFIG_GPIOLIB 1311 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset) 1312 { 1313 struct usb_serial *serial = gpiochip_get_data(gc); 1314 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1315 1316 switch (offset) { 1317 case 0: 1318 if (priv->config & CP2105_GPIO0_TXLED_MODE) 1319 return -ENODEV; 1320 break; 1321 case 1: 1322 if (priv->config & (CP2105_GPIO1_RXLED_MODE | 1323 CP2105_GPIO1_RS485_MODE)) 1324 return -ENODEV; 1325 break; 1326 } 1327 1328 return 0; 1329 } 1330 1331 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio) 1332 { 1333 struct usb_serial *serial = gpiochip_get_data(gc); 1334 int result; 1335 u8 buf; 1336 1337 result = cp210x_read_vendor_block(serial, REQTYPE_INTERFACE_TO_HOST, 1338 CP210X_READ_LATCH, &buf, sizeof(buf)); 1339 if (result < 0) 1340 return result; 1341 1342 return !!(buf & BIT(gpio)); 1343 } 1344 1345 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value) 1346 { 1347 struct usb_serial *serial = gpiochip_get_data(gc); 1348 struct cp210x_gpio_write buf; 1349 1350 if (value == 1) 1351 buf.state = BIT(gpio); 1352 else 1353 buf.state = 0; 1354 1355 buf.mask = BIT(gpio); 1356 1357 cp210x_write_vendor_block(serial, REQTYPE_HOST_TO_INTERFACE, 1358 CP210X_WRITE_LATCH, &buf, sizeof(buf)); 1359 } 1360 1361 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio) 1362 { 1363 /* Hardware does not support an input mode */ 1364 return 0; 1365 } 1366 1367 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio) 1368 { 1369 /* Hardware does not support an input mode */ 1370 return -ENOTSUPP; 1371 } 1372 1373 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio, 1374 int value) 1375 { 1376 return 0; 1377 } 1378 1379 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio, 1380 unsigned long config) 1381 { 1382 struct usb_serial *serial = gpiochip_get_data(gc); 1383 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1384 enum pin_config_param param = pinconf_to_config_param(config); 1385 1386 /* Succeed only if in correct mode (this can't be set at runtime) */ 1387 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) && 1388 (priv->gpio_mode & BIT(gpio))) 1389 return 0; 1390 1391 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) && 1392 !(priv->gpio_mode & BIT(gpio))) 1393 return 0; 1394 1395 return -ENOTSUPP; 1396 } 1397 1398 /* 1399 * This function is for configuring GPIO using shared pins, where other signals 1400 * are made unavailable by configuring the use of GPIO. This is believed to be 1401 * only applicable to the cp2105 at this point, the other devices supported by 1402 * this driver that provide GPIO do so in a way that does not impact other 1403 * signals and are thus expected to have very different initialisation. 1404 */ 1405 static int cp2105_shared_gpio_init(struct usb_serial *serial) 1406 { 1407 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1408 struct cp210x_pin_mode mode; 1409 struct cp210x_config config; 1410 u8 intf_num = cp210x_interface_num(serial); 1411 int result; 1412 1413 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1414 CP210X_GET_DEVICEMODE, &mode, 1415 sizeof(mode)); 1416 if (result < 0) 1417 return result; 1418 1419 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1420 CP210X_GET_PORTCONFIG, &config, 1421 sizeof(config)); 1422 if (result < 0) 1423 return result; 1424 1425 /* 2 banks of GPIO - One for the pins taken from each serial port */ 1426 if (intf_num == 0) { 1427 if (mode.eci == CP210X_PIN_MODE_MODEM) 1428 return 0; 1429 1430 priv->config = config.eci_cfg; 1431 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) & 1432 CP210X_ECI_GPIO_MODE_MASK) >> 1433 CP210X_ECI_GPIO_MODE_OFFSET); 1434 priv->gc.ngpio = 2; 1435 } else if (intf_num == 1) { 1436 if (mode.sci == CP210X_PIN_MODE_MODEM) 1437 return 0; 1438 1439 priv->config = config.sci_cfg; 1440 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) & 1441 CP210X_SCI_GPIO_MODE_MASK) >> 1442 CP210X_SCI_GPIO_MODE_OFFSET); 1443 priv->gc.ngpio = 3; 1444 } else { 1445 return -ENODEV; 1446 } 1447 1448 priv->gc.label = "cp210x"; 1449 priv->gc.request = cp210x_gpio_request; 1450 priv->gc.get_direction = cp210x_gpio_direction_get; 1451 priv->gc.direction_input = cp210x_gpio_direction_input; 1452 priv->gc.direction_output = cp210x_gpio_direction_output; 1453 priv->gc.get = cp210x_gpio_get; 1454 priv->gc.set = cp210x_gpio_set; 1455 priv->gc.set_config = cp210x_gpio_set_config; 1456 priv->gc.owner = THIS_MODULE; 1457 priv->gc.parent = &serial->interface->dev; 1458 priv->gc.base = -1; 1459 priv->gc.can_sleep = true; 1460 1461 result = gpiochip_add_data(&priv->gc, serial); 1462 if (!result) 1463 priv->gpio_registered = true; 1464 1465 return result; 1466 } 1467 1468 static void cp210x_gpio_remove(struct usb_serial *serial) 1469 { 1470 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1471 1472 if (priv->gpio_registered) { 1473 gpiochip_remove(&priv->gc); 1474 priv->gpio_registered = false; 1475 } 1476 } 1477 1478 #else 1479 1480 static int cp2105_shared_gpio_init(struct usb_serial *serial) 1481 { 1482 return 0; 1483 } 1484 1485 static void cp210x_gpio_remove(struct usb_serial *serial) 1486 { 1487 /* Nothing to do */ 1488 } 1489 1490 #endif 1491 1492 static int cp210x_port_probe(struct usb_serial_port *port) 1493 { 1494 struct usb_serial *serial = port->serial; 1495 struct cp210x_port_private *port_priv; 1496 int ret; 1497 1498 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 1499 if (!port_priv) 1500 return -ENOMEM; 1501 1502 port_priv->bInterfaceNumber = cp210x_interface_num(serial); 1503 1504 usb_set_serial_port_data(port, port_priv); 1505 1506 ret = cp210x_detect_swapped_line_ctl(port); 1507 if (ret) { 1508 kfree(port_priv); 1509 return ret; 1510 } 1511 1512 return 0; 1513 } 1514 1515 static int cp210x_port_remove(struct usb_serial_port *port) 1516 { 1517 struct cp210x_port_private *port_priv; 1518 1519 port_priv = usb_get_serial_port_data(port); 1520 kfree(port_priv); 1521 1522 return 0; 1523 } 1524 1525 static void cp210x_init_max_speed(struct usb_serial *serial) 1526 { 1527 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1528 bool use_actual_rate = false; 1529 speed_t max; 1530 1531 switch (priv->partnum) { 1532 case CP210X_PARTNUM_CP2101: 1533 max = 921600; 1534 break; 1535 case CP210X_PARTNUM_CP2102: 1536 case CP210X_PARTNUM_CP2103: 1537 max = 1000000; 1538 break; 1539 case CP210X_PARTNUM_CP2104: 1540 use_actual_rate = true; 1541 max = 2000000; 1542 break; 1543 case CP210X_PARTNUM_CP2108: 1544 max = 2000000; 1545 break; 1546 case CP210X_PARTNUM_CP2105: 1547 if (cp210x_interface_num(serial) == 0) { 1548 use_actual_rate = true; 1549 max = 2000000; /* ECI */ 1550 } else { 1551 max = 921600; /* SCI */ 1552 } 1553 break; 1554 case CP210X_PARTNUM_CP2102N_QFN28: 1555 case CP210X_PARTNUM_CP2102N_QFN24: 1556 case CP210X_PARTNUM_CP2102N_QFN20: 1557 use_actual_rate = true; 1558 max = 3000000; 1559 break; 1560 default: 1561 max = 2000000; 1562 break; 1563 } 1564 1565 priv->max_speed = max; 1566 priv->use_actual_rate = use_actual_rate; 1567 } 1568 1569 static int cp210x_attach(struct usb_serial *serial) 1570 { 1571 int result; 1572 struct cp210x_serial_private *priv; 1573 1574 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1575 if (!priv) 1576 return -ENOMEM; 1577 1578 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1579 CP210X_GET_PARTNUM, &priv->partnum, 1580 sizeof(priv->partnum)); 1581 if (result < 0) { 1582 dev_warn(&serial->interface->dev, 1583 "querying part number failed\n"); 1584 priv->partnum = CP210X_PARTNUM_UNKNOWN; 1585 } 1586 1587 usb_set_serial_data(serial, priv); 1588 1589 cp210x_init_max_speed(serial); 1590 1591 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1592 result = cp2105_shared_gpio_init(serial); 1593 if (result < 0) { 1594 dev_err(&serial->interface->dev, 1595 "GPIO initialisation failed, continuing without GPIO support\n"); 1596 } 1597 } 1598 1599 return 0; 1600 } 1601 1602 static void cp210x_disconnect(struct usb_serial *serial) 1603 { 1604 cp210x_gpio_remove(serial); 1605 } 1606 1607 static void cp210x_release(struct usb_serial *serial) 1608 { 1609 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1610 1611 cp210x_gpio_remove(serial); 1612 1613 kfree(priv); 1614 } 1615 1616 module_usb_serial_driver(serial_drivers, id_table); 1617 1618 MODULE_DESCRIPTION(DRIVER_DESC); 1619 MODULE_LICENSE("GPL v2"); 1620