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 * Copyright (C) 2010-2021 Johan Hovold (johan@kernel.org) 7 * 8 * Support to set flow control line levels using TIOCMGET and TIOCMSET 9 * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow 10 * control thanks to Munir Nassar nassarmu@real-time.com 11 * 12 */ 13 14 #include <linux/kernel.h> 15 #include <linux/errno.h> 16 #include <linux/slab.h> 17 #include <linux/tty.h> 18 #include <linux/tty_flip.h> 19 #include <linux/module.h> 20 #include <linux/usb.h> 21 #include <linux/usb/serial.h> 22 #include <linux/gpio/driver.h> 23 #include <linux/bitops.h> 24 #include <linux/mutex.h> 25 26 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver" 27 28 /* 29 * Function Prototypes 30 */ 31 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *); 32 static void cp210x_close(struct usb_serial_port *); 33 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *, 34 struct ktermios *); 35 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *, 36 struct ktermios*); 37 static bool cp210x_tx_empty(struct usb_serial_port *port); 38 static int cp210x_tiocmget(struct tty_struct *); 39 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int); 40 static int cp210x_tiocmset_port(struct usb_serial_port *port, 41 unsigned int, unsigned int); 42 static void cp210x_break_ctl(struct tty_struct *, int); 43 static int cp210x_attach(struct usb_serial *); 44 static void cp210x_disconnect(struct usb_serial *); 45 static void cp210x_release(struct usb_serial *); 46 static int cp210x_port_probe(struct usb_serial_port *); 47 static void cp210x_port_remove(struct usb_serial_port *); 48 static void cp210x_dtr_rts(struct usb_serial_port *port, int on); 49 static void cp210x_process_read_urb(struct urb *urb); 50 static void cp210x_enable_event_mode(struct usb_serial_port *port); 51 static void cp210x_disable_event_mode(struct usb_serial_port *port); 52 53 static const struct usb_device_id id_table[] = { 54 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */ 55 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */ 56 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 57 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 58 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */ 59 { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */ 60 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */ 61 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */ 62 { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */ 63 { USB_DEVICE(0x0988, 0x0578) }, /* Teraoka AD2000 */ 64 { USB_DEVICE(0x0B00, 0x3070) }, /* Ingenico 3070 */ 65 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */ 66 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */ 67 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */ 68 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */ 69 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */ 70 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */ 71 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */ 72 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */ 73 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */ 74 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */ 75 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */ 76 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */ 77 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */ 78 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */ 79 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */ 80 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */ 81 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */ 82 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */ 83 { USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */ 84 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */ 85 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */ 86 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */ 87 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */ 88 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */ 89 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */ 90 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */ 91 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */ 92 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */ 93 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */ 94 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */ 95 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */ 96 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */ 97 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */ 98 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */ 99 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */ 100 { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */ 101 { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */ 102 { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */ 103 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */ 104 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */ 105 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */ 106 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */ 107 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */ 108 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */ 109 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */ 110 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */ 111 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */ 112 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */ 113 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */ 114 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */ 115 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */ 116 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */ 117 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */ 118 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */ 119 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */ 120 { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */ 121 { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */ 122 { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */ 123 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */ 124 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */ 125 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */ 126 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */ 127 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */ 128 { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */ 129 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */ 130 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ 131 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ 132 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 133 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */ 134 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ 135 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */ 136 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */ 137 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */ 138 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */ 139 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ 140 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ 141 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */ 142 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 143 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 144 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */ 145 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */ 146 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */ 147 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */ 148 { USB_DEVICE(0x10C4, 0x88D8) }, /* Acuity Brands nLight Air Adapter */ 149 { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */ 150 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */ 151 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */ 152 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */ 153 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */ 154 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */ 155 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */ 156 { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */ 157 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */ 158 { USB_DEVICE(0x10C4, 0x8A5B) }, /* CEL EM3588 ZigBee USB Stick */ 159 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */ 160 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */ 161 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 162 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 163 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */ 164 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 165 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 166 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */ 167 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */ 168 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 169 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 170 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 171 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 172 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 173 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 174 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */ 175 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */ 176 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 177 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 178 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */ 179 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */ 180 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */ 181 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 182 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */ 183 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */ 184 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */ 185 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */ 186 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */ 187 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */ 188 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 189 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ 190 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ 191 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ 192 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ 193 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ 194 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ 195 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 196 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 197 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 198 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */ 199 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */ 200 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */ 201 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */ 202 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */ 203 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */ 204 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */ 205 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */ 206 { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 M.2 Key E serial interface */ 207 { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 Display serial interface */ 208 { USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */ 209 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */ 210 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */ 211 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */ 212 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */ 213 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 214 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */ 215 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 216 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 217 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 218 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 219 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 220 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 221 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 222 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 223 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 224 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 225 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 226 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 227 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 228 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 229 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 230 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 231 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 232 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 233 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 234 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 235 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 236 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */ 237 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 238 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 239 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 240 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */ 241 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 242 { } /* Terminating Entry */ 243 }; 244 245 MODULE_DEVICE_TABLE(usb, id_table); 246 247 struct cp210x_serial_private { 248 #ifdef CONFIG_GPIOLIB 249 struct gpio_chip gc; 250 bool gpio_registered; 251 u16 gpio_pushpull; 252 u16 gpio_altfunc; 253 u16 gpio_input; 254 #endif 255 u8 partnum; 256 u32 fw_version; 257 speed_t min_speed; 258 speed_t max_speed; 259 bool use_actual_rate; 260 bool no_flow_control; 261 }; 262 263 enum cp210x_event_state { 264 ES_DATA, 265 ES_ESCAPE, 266 ES_LSR, 267 ES_LSR_DATA_0, 268 ES_LSR_DATA_1, 269 ES_MSR 270 }; 271 272 struct cp210x_port_private { 273 u8 bInterfaceNumber; 274 bool event_mode; 275 enum cp210x_event_state event_state; 276 u8 lsr; 277 278 struct mutex mutex; 279 bool crtscts; 280 bool dtr; 281 bool rts; 282 }; 283 284 static struct usb_serial_driver cp210x_device = { 285 .driver = { 286 .owner = THIS_MODULE, 287 .name = "cp210x", 288 }, 289 .id_table = id_table, 290 .num_ports = 1, 291 .bulk_in_size = 256, 292 .bulk_out_size = 256, 293 .open = cp210x_open, 294 .close = cp210x_close, 295 .break_ctl = cp210x_break_ctl, 296 .set_termios = cp210x_set_termios, 297 .tx_empty = cp210x_tx_empty, 298 .throttle = usb_serial_generic_throttle, 299 .unthrottle = usb_serial_generic_unthrottle, 300 .tiocmget = cp210x_tiocmget, 301 .tiocmset = cp210x_tiocmset, 302 .get_icount = usb_serial_generic_get_icount, 303 .attach = cp210x_attach, 304 .disconnect = cp210x_disconnect, 305 .release = cp210x_release, 306 .port_probe = cp210x_port_probe, 307 .port_remove = cp210x_port_remove, 308 .dtr_rts = cp210x_dtr_rts, 309 .process_read_urb = cp210x_process_read_urb, 310 }; 311 312 static struct usb_serial_driver * const serial_drivers[] = { 313 &cp210x_device, NULL 314 }; 315 316 /* Config request types */ 317 #define REQTYPE_HOST_TO_INTERFACE 0x41 318 #define REQTYPE_INTERFACE_TO_HOST 0xc1 319 #define REQTYPE_HOST_TO_DEVICE 0x40 320 #define REQTYPE_DEVICE_TO_HOST 0xc0 321 322 /* Config request codes */ 323 #define CP210X_IFC_ENABLE 0x00 324 #define CP210X_SET_BAUDDIV 0x01 325 #define CP210X_GET_BAUDDIV 0x02 326 #define CP210X_SET_LINE_CTL 0x03 327 #define CP210X_GET_LINE_CTL 0x04 328 #define CP210X_SET_BREAK 0x05 329 #define CP210X_IMM_CHAR 0x06 330 #define CP210X_SET_MHS 0x07 331 #define CP210X_GET_MDMSTS 0x08 332 #define CP210X_SET_XON 0x09 333 #define CP210X_SET_XOFF 0x0A 334 #define CP210X_SET_EVENTMASK 0x0B 335 #define CP210X_GET_EVENTMASK 0x0C 336 #define CP210X_SET_CHAR 0x0D 337 #define CP210X_GET_CHARS 0x0E 338 #define CP210X_GET_PROPS 0x0F 339 #define CP210X_GET_COMM_STATUS 0x10 340 #define CP210X_RESET 0x11 341 #define CP210X_PURGE 0x12 342 #define CP210X_SET_FLOW 0x13 343 #define CP210X_GET_FLOW 0x14 344 #define CP210X_EMBED_EVENTS 0x15 345 #define CP210X_GET_EVENTSTATE 0x16 346 #define CP210X_SET_CHARS 0x19 347 #define CP210X_GET_BAUDRATE 0x1D 348 #define CP210X_SET_BAUDRATE 0x1E 349 #define CP210X_VENDOR_SPECIFIC 0xFF 350 351 /* CP210X_IFC_ENABLE */ 352 #define UART_ENABLE 0x0001 353 #define UART_DISABLE 0x0000 354 355 /* CP210X_(SET|GET)_BAUDDIV */ 356 #define BAUD_RATE_GEN_FREQ 0x384000 357 358 /* CP210X_(SET|GET)_LINE_CTL */ 359 #define BITS_DATA_MASK 0X0f00 360 #define BITS_DATA_5 0X0500 361 #define BITS_DATA_6 0X0600 362 #define BITS_DATA_7 0X0700 363 #define BITS_DATA_8 0X0800 364 #define BITS_DATA_9 0X0900 365 366 #define BITS_PARITY_MASK 0x00f0 367 #define BITS_PARITY_NONE 0x0000 368 #define BITS_PARITY_ODD 0x0010 369 #define BITS_PARITY_EVEN 0x0020 370 #define BITS_PARITY_MARK 0x0030 371 #define BITS_PARITY_SPACE 0x0040 372 373 #define BITS_STOP_MASK 0x000f 374 #define BITS_STOP_1 0x0000 375 #define BITS_STOP_1_5 0x0001 376 #define BITS_STOP_2 0x0002 377 378 /* CP210X_SET_BREAK */ 379 #define BREAK_ON 0x0001 380 #define BREAK_OFF 0x0000 381 382 /* CP210X_(SET_MHS|GET_MDMSTS) */ 383 #define CONTROL_DTR 0x0001 384 #define CONTROL_RTS 0x0002 385 #define CONTROL_CTS 0x0010 386 #define CONTROL_DSR 0x0020 387 #define CONTROL_RING 0x0040 388 #define CONTROL_DCD 0x0080 389 #define CONTROL_WRITE_DTR 0x0100 390 #define CONTROL_WRITE_RTS 0x0200 391 392 /* CP210X_(GET|SET)_CHARS */ 393 struct cp210x_special_chars { 394 u8 bEofChar; 395 u8 bErrorChar; 396 u8 bBreakChar; 397 u8 bEventChar; 398 u8 bXonChar; 399 u8 bXoffChar; 400 }; 401 402 /* CP210X_VENDOR_SPECIFIC values */ 403 #define CP210X_READ_2NCONFIG 0x000E 404 #define CP210X_GET_FW_VER_2N 0x0010 405 #define CP210X_READ_LATCH 0x00C2 406 #define CP210X_GET_PARTNUM 0x370B 407 #define CP210X_GET_PORTCONFIG 0x370C 408 #define CP210X_GET_DEVICEMODE 0x3711 409 #define CP210X_WRITE_LATCH 0x37E1 410 411 /* Part number definitions */ 412 #define CP210X_PARTNUM_CP2101 0x01 413 #define CP210X_PARTNUM_CP2102 0x02 414 #define CP210X_PARTNUM_CP2103 0x03 415 #define CP210X_PARTNUM_CP2104 0x04 416 #define CP210X_PARTNUM_CP2105 0x05 417 #define CP210X_PARTNUM_CP2108 0x08 418 #define CP210X_PARTNUM_CP2102N_QFN28 0x20 419 #define CP210X_PARTNUM_CP2102N_QFN24 0x21 420 #define CP210X_PARTNUM_CP2102N_QFN20 0x22 421 #define CP210X_PARTNUM_UNKNOWN 0xFF 422 423 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 424 struct cp210x_comm_status { 425 __le32 ulErrors; 426 __le32 ulHoldReasons; 427 __le32 ulAmountInInQueue; 428 __le32 ulAmountInOutQueue; 429 u8 bEofReceived; 430 u8 bWaitForImmediate; 431 u8 bReserved; 432 } __packed; 433 434 /* 435 * CP210X_PURGE - 16 bits passed in wValue of USB request. 436 * SiLabs app note AN571 gives a strange description of the 4 bits: 437 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 438 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 439 */ 440 #define PURGE_ALL 0x000f 441 442 /* CP210X_EMBED_EVENTS */ 443 #define CP210X_ESCCHAR 0xec 444 445 #define CP210X_LSR_OVERRUN BIT(1) 446 #define CP210X_LSR_PARITY BIT(2) 447 #define CP210X_LSR_FRAME BIT(3) 448 #define CP210X_LSR_BREAK BIT(4) 449 450 451 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */ 452 struct cp210x_flow_ctl { 453 __le32 ulControlHandshake; 454 __le32 ulFlowReplace; 455 __le32 ulXonLimit; 456 __le32 ulXoffLimit; 457 }; 458 459 /* cp210x_flow_ctl::ulControlHandshake */ 460 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0) 461 #define CP210X_SERIAL_DTR_INACTIVE (0 << 0) 462 #define CP210X_SERIAL_DTR_ACTIVE (1 << 0) 463 #define CP210X_SERIAL_DTR_FLOW_CTL (2 << 0) 464 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3) 465 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4) 466 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5) 467 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6) 468 469 /* cp210x_flow_ctl::ulFlowReplace */ 470 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0) 471 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1) 472 #define CP210X_SERIAL_ERROR_CHAR BIT(2) 473 #define CP210X_SERIAL_NULL_STRIPPING BIT(3) 474 #define CP210X_SERIAL_BREAK_CHAR BIT(4) 475 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6) 476 #define CP210X_SERIAL_RTS_INACTIVE (0 << 6) 477 #define CP210X_SERIAL_RTS_ACTIVE (1 << 6) 478 #define CP210X_SERIAL_RTS_FLOW_CTL (2 << 6) 479 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31) 480 481 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */ 482 struct cp210x_pin_mode { 483 u8 eci; 484 u8 sci; 485 }; 486 487 #define CP210X_PIN_MODE_MODEM 0 488 #define CP210X_PIN_MODE_GPIO BIT(0) 489 490 /* 491 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes 492 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes. 493 */ 494 struct cp210x_dual_port_config { 495 __le16 gpio_mode; 496 u8 __pad0[2]; 497 __le16 reset_state; 498 u8 __pad1[4]; 499 __le16 suspend_state; 500 u8 sci_cfg; 501 u8 eci_cfg; 502 u8 device_cfg; 503 } __packed; 504 505 /* 506 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes 507 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes. 508 */ 509 struct cp210x_single_port_config { 510 __le16 gpio_mode; 511 u8 __pad0[2]; 512 __le16 reset_state; 513 u8 __pad1[4]; 514 __le16 suspend_state; 515 u8 device_cfg; 516 } __packed; 517 518 /* GPIO modes */ 519 #define CP210X_SCI_GPIO_MODE_OFFSET 9 520 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9) 521 522 #define CP210X_ECI_GPIO_MODE_OFFSET 2 523 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2) 524 525 #define CP210X_GPIO_MODE_OFFSET 8 526 #define CP210X_GPIO_MODE_MASK GENMASK(11, 8) 527 528 /* CP2105 port configuration values */ 529 #define CP2105_GPIO0_TXLED_MODE BIT(0) 530 #define CP2105_GPIO1_RXLED_MODE BIT(1) 531 #define CP2105_GPIO1_RS485_MODE BIT(2) 532 533 /* CP2104 port configuration values */ 534 #define CP2104_GPIO0_TXLED_MODE BIT(0) 535 #define CP2104_GPIO1_RXLED_MODE BIT(1) 536 #define CP2104_GPIO2_RS485_MODE BIT(2) 537 538 struct cp210x_quad_port_state { 539 __le16 gpio_mode_pb0; 540 __le16 gpio_mode_pb1; 541 __le16 gpio_mode_pb2; 542 __le16 gpio_mode_pb3; 543 __le16 gpio_mode_pb4; 544 545 __le16 gpio_lowpower_pb0; 546 __le16 gpio_lowpower_pb1; 547 __le16 gpio_lowpower_pb2; 548 __le16 gpio_lowpower_pb3; 549 __le16 gpio_lowpower_pb4; 550 551 __le16 gpio_latch_pb0; 552 __le16 gpio_latch_pb1; 553 __le16 gpio_latch_pb2; 554 __le16 gpio_latch_pb3; 555 __le16 gpio_latch_pb4; 556 }; 557 558 /* 559 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0x49 bytes 560 * on a CP2108 chip. 561 * 562 * See https://www.silabs.com/documents/public/application-notes/an978-cp210x-usb-to-uart-api-specification.pdf 563 */ 564 struct cp210x_quad_port_config { 565 struct cp210x_quad_port_state reset_state; 566 struct cp210x_quad_port_state suspend_state; 567 u8 ipdelay_ifc[4]; 568 u8 enhancedfxn_ifc[4]; 569 u8 enhancedfxn_device; 570 u8 extclkfreq[4]; 571 } __packed; 572 573 #define CP2108_EF_IFC_GPIO_TXLED 0x01 574 #define CP2108_EF_IFC_GPIO_RXLED 0x02 575 #define CP2108_EF_IFC_GPIO_RS485 0x04 576 #define CP2108_EF_IFC_GPIO_RS485_LOGIC 0x08 577 #define CP2108_EF_IFC_GPIO_CLOCK 0x10 578 #define CP2108_EF_IFC_DYNAMIC_SUSPEND 0x40 579 580 /* CP2102N configuration array indices */ 581 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2 582 #define CP210X_2NCONFIG_GPIO_MODE_IDX 581 583 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587 584 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600 585 586 /* CP2102N QFN20 port configuration values */ 587 #define CP2102N_QFN20_GPIO2_TXLED_MODE BIT(2) 588 #define CP2102N_QFN20_GPIO3_RXLED_MODE BIT(3) 589 #define CP2102N_QFN20_GPIO1_RS485_MODE BIT(4) 590 #define CP2102N_QFN20_GPIO0_CLK_MODE BIT(6) 591 592 /* 593 * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x02 bytes 594 * for CP2102N, CP2103, CP2104 and CP2105. 595 */ 596 struct cp210x_gpio_write { 597 u8 mask; 598 u8 state; 599 }; 600 601 /* 602 * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x04 bytes 603 * for CP2108. 604 */ 605 struct cp210x_gpio_write16 { 606 __le16 mask; 607 __le16 state; 608 }; 609 610 /* 611 * Helper to get interface number when we only have struct usb_serial. 612 */ 613 static u8 cp210x_interface_num(struct usb_serial *serial) 614 { 615 struct usb_host_interface *cur_altsetting; 616 617 cur_altsetting = serial->interface->cur_altsetting; 618 619 return cur_altsetting->desc.bInterfaceNumber; 620 } 621 622 /* 623 * Reads a variable-sized block of CP210X_ registers, identified by req. 624 * Returns data into buf in native USB byte order. 625 */ 626 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, 627 void *buf, int bufsize) 628 { 629 struct usb_serial *serial = port->serial; 630 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 631 void *dmabuf; 632 int result; 633 634 dmabuf = kmalloc(bufsize, GFP_KERNEL); 635 if (!dmabuf) 636 return -ENOMEM; 637 638 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 639 req, REQTYPE_INTERFACE_TO_HOST, 0, 640 port_priv->bInterfaceNumber, dmabuf, bufsize, 641 USB_CTRL_SET_TIMEOUT); 642 if (result == bufsize) { 643 memcpy(buf, dmabuf, bufsize); 644 result = 0; 645 } else { 646 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", 647 req, bufsize, result); 648 if (result >= 0) 649 result = -EIO; 650 } 651 652 kfree(dmabuf); 653 654 return result; 655 } 656 657 /* 658 * Reads any 8-bit CP210X_ register identified by req. 659 */ 660 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val) 661 { 662 return cp210x_read_reg_block(port, req, val, sizeof(*val)); 663 } 664 665 /* 666 * Reads a variable-sized vendor block of CP210X_ registers, identified by val. 667 * Returns data into buf in native USB byte order. 668 */ 669 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val, 670 void *buf, int bufsize) 671 { 672 void *dmabuf; 673 int result; 674 675 dmabuf = kmalloc(bufsize, GFP_KERNEL); 676 if (!dmabuf) 677 return -ENOMEM; 678 679 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 680 CP210X_VENDOR_SPECIFIC, type, val, 681 cp210x_interface_num(serial), dmabuf, bufsize, 682 USB_CTRL_GET_TIMEOUT); 683 if (result == bufsize) { 684 memcpy(buf, dmabuf, bufsize); 685 result = 0; 686 } else { 687 dev_err(&serial->interface->dev, 688 "failed to get vendor val 0x%04x size %d: %d\n", val, 689 bufsize, result); 690 if (result >= 0) 691 result = -EIO; 692 } 693 694 kfree(dmabuf); 695 696 return result; 697 } 698 699 /* 700 * Writes any 16-bit CP210X_ register (req) whose value is passed 701 * entirely in the wValue field of the USB request. 702 */ 703 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) 704 { 705 struct usb_serial *serial = port->serial; 706 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 707 int result; 708 709 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 710 req, REQTYPE_HOST_TO_INTERFACE, val, 711 port_priv->bInterfaceNumber, NULL, 0, 712 USB_CTRL_SET_TIMEOUT); 713 if (result < 0) { 714 dev_err(&port->dev, "failed set request 0x%x status: %d\n", 715 req, result); 716 } 717 718 return result; 719 } 720 721 /* 722 * Writes a variable-sized block of CP210X_ registers, identified by req. 723 * Data in buf must be in native USB byte order. 724 */ 725 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req, 726 void *buf, int bufsize) 727 { 728 struct usb_serial *serial = port->serial; 729 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 730 void *dmabuf; 731 int result; 732 733 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 734 if (!dmabuf) 735 return -ENOMEM; 736 737 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 738 req, REQTYPE_HOST_TO_INTERFACE, 0, 739 port_priv->bInterfaceNumber, dmabuf, bufsize, 740 USB_CTRL_SET_TIMEOUT); 741 742 kfree(dmabuf); 743 744 if (result < 0) { 745 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", 746 req, bufsize, result); 747 return result; 748 } 749 750 return 0; 751 } 752 753 /* 754 * Writes any 32-bit CP210X_ register identified by req. 755 */ 756 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) 757 { 758 __le32 le32_val; 759 760 le32_val = cpu_to_le32(val); 761 762 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); 763 } 764 765 #ifdef CONFIG_GPIOLIB 766 /* 767 * Writes a variable-sized vendor block of CP210X_ registers, identified by val. 768 * Data in buf must be in native USB byte order. 769 */ 770 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type, 771 u16 val, void *buf, int bufsize) 772 { 773 void *dmabuf; 774 int result; 775 776 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 777 if (!dmabuf) 778 return -ENOMEM; 779 780 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 781 CP210X_VENDOR_SPECIFIC, type, val, 782 cp210x_interface_num(serial), dmabuf, bufsize, 783 USB_CTRL_SET_TIMEOUT); 784 785 kfree(dmabuf); 786 787 if (result < 0) { 788 dev_err(&serial->interface->dev, 789 "failed to set vendor val 0x%04x size %d: %d\n", val, 790 bufsize, result); 791 return result; 792 } 793 794 return 0; 795 } 796 #endif 797 798 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 799 { 800 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 801 int result; 802 803 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 804 if (result) { 805 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 806 return result; 807 } 808 809 if (tty) 810 cp210x_set_termios(tty, port, NULL); 811 812 result = usb_serial_generic_open(tty, port); 813 if (result) 814 goto err_disable; 815 816 return 0; 817 818 err_disable: 819 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 820 port_priv->event_mode = false; 821 822 return result; 823 } 824 825 static void cp210x_close(struct usb_serial_port *port) 826 { 827 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 828 829 usb_serial_generic_close(port); 830 831 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 832 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 833 834 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 835 836 /* Disabling the interface disables event-insertion mode. */ 837 port_priv->event_mode = false; 838 } 839 840 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag) 841 { 842 if (lsr & CP210X_LSR_BREAK) { 843 port->icount.brk++; 844 *flag = TTY_BREAK; 845 } else if (lsr & CP210X_LSR_PARITY) { 846 port->icount.parity++; 847 *flag = TTY_PARITY; 848 } else if (lsr & CP210X_LSR_FRAME) { 849 port->icount.frame++; 850 *flag = TTY_FRAME; 851 } 852 853 if (lsr & CP210X_LSR_OVERRUN) { 854 port->icount.overrun++; 855 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); 856 } 857 } 858 859 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag) 860 { 861 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 862 863 switch (port_priv->event_state) { 864 case ES_DATA: 865 if (*ch == CP210X_ESCCHAR) { 866 port_priv->event_state = ES_ESCAPE; 867 break; 868 } 869 return false; 870 case ES_ESCAPE: 871 switch (*ch) { 872 case 0: 873 dev_dbg(&port->dev, "%s - escape char\n", __func__); 874 *ch = CP210X_ESCCHAR; 875 port_priv->event_state = ES_DATA; 876 return false; 877 case 1: 878 port_priv->event_state = ES_LSR_DATA_0; 879 break; 880 case 2: 881 port_priv->event_state = ES_LSR; 882 break; 883 case 3: 884 port_priv->event_state = ES_MSR; 885 break; 886 default: 887 dev_err(&port->dev, "malformed event 0x%02x\n", *ch); 888 port_priv->event_state = ES_DATA; 889 break; 890 } 891 break; 892 case ES_LSR_DATA_0: 893 port_priv->lsr = *ch; 894 port_priv->event_state = ES_LSR_DATA_1; 895 break; 896 case ES_LSR_DATA_1: 897 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n", 898 __func__, port_priv->lsr, *ch); 899 cp210x_process_lsr(port, port_priv->lsr, flag); 900 port_priv->event_state = ES_DATA; 901 return false; 902 case ES_LSR: 903 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch); 904 port_priv->lsr = *ch; 905 cp210x_process_lsr(port, port_priv->lsr, flag); 906 port_priv->event_state = ES_DATA; 907 break; 908 case ES_MSR: 909 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch); 910 /* unimplemented */ 911 port_priv->event_state = ES_DATA; 912 break; 913 } 914 915 return true; 916 } 917 918 static void cp210x_process_read_urb(struct urb *urb) 919 { 920 struct usb_serial_port *port = urb->context; 921 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 922 unsigned char *ch = urb->transfer_buffer; 923 char flag; 924 int i; 925 926 if (!urb->actual_length) 927 return; 928 929 if (port_priv->event_mode) { 930 for (i = 0; i < urb->actual_length; i++, ch++) { 931 flag = TTY_NORMAL; 932 933 if (cp210x_process_char(port, ch, &flag)) 934 continue; 935 936 tty_insert_flip_char(&port->port, *ch, flag); 937 } 938 } else { 939 tty_insert_flip_string(&port->port, ch, urb->actual_length); 940 } 941 tty_flip_buffer_push(&port->port); 942 } 943 944 /* 945 * Read how many bytes are waiting in the TX queue. 946 */ 947 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 948 u32 *count) 949 { 950 struct usb_serial *serial = port->serial; 951 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 952 struct cp210x_comm_status *sts; 953 int result; 954 955 sts = kmalloc(sizeof(*sts), GFP_KERNEL); 956 if (!sts) 957 return -ENOMEM; 958 959 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 960 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST, 961 0, port_priv->bInterfaceNumber, sts, sizeof(*sts), 962 USB_CTRL_GET_TIMEOUT); 963 if (result == sizeof(*sts)) { 964 *count = le32_to_cpu(sts->ulAmountInOutQueue); 965 result = 0; 966 } else { 967 dev_err(&port->dev, "failed to get comm status: %d\n", result); 968 if (result >= 0) 969 result = -EIO; 970 } 971 972 kfree(sts); 973 974 return result; 975 } 976 977 static bool cp210x_tx_empty(struct usb_serial_port *port) 978 { 979 int err; 980 u32 count; 981 982 err = cp210x_get_tx_queue_byte_count(port, &count); 983 if (err) 984 return true; 985 986 return !count; 987 } 988 989 struct cp210x_rate { 990 speed_t rate; 991 speed_t high; 992 }; 993 994 static const struct cp210x_rate cp210x_an205_table1[] = { 995 { 300, 300 }, 996 { 600, 600 }, 997 { 1200, 1200 }, 998 { 1800, 1800 }, 999 { 2400, 2400 }, 1000 { 4000, 4000 }, 1001 { 4800, 4803 }, 1002 { 7200, 7207 }, 1003 { 9600, 9612 }, 1004 { 14400, 14428 }, 1005 { 16000, 16062 }, 1006 { 19200, 19250 }, 1007 { 28800, 28912 }, 1008 { 38400, 38601 }, 1009 { 51200, 51558 }, 1010 { 56000, 56280 }, 1011 { 57600, 58053 }, 1012 { 64000, 64111 }, 1013 { 76800, 77608 }, 1014 { 115200, 117028 }, 1015 { 128000, 129347 }, 1016 { 153600, 156868 }, 1017 { 230400, 237832 }, 1018 { 250000, 254234 }, 1019 { 256000, 273066 }, 1020 { 460800, 491520 }, 1021 { 500000, 567138 }, 1022 { 576000, 670254 }, 1023 { 921600, UINT_MAX } 1024 }; 1025 1026 /* 1027 * Quantises the baud rate as per AN205 Table 1 1028 */ 1029 static speed_t cp210x_get_an205_rate(speed_t baud) 1030 { 1031 int i; 1032 1033 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) { 1034 if (baud <= cp210x_an205_table1[i].high) 1035 break; 1036 } 1037 1038 return cp210x_an205_table1[i].rate; 1039 } 1040 1041 static speed_t cp210x_get_actual_rate(speed_t baud) 1042 { 1043 unsigned int prescale = 1; 1044 unsigned int div; 1045 1046 if (baud <= 365) 1047 prescale = 4; 1048 1049 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud); 1050 baud = 48000000 / (2 * prescale * div); 1051 1052 return baud; 1053 } 1054 1055 /* 1056 * CP2101 supports the following baud rates: 1057 * 1058 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 1059 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 1060 * 1061 * CP2102 and CP2103 support the following additional rates: 1062 * 1063 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 1064 * 576000 1065 * 1066 * The device will map a requested rate to a supported one, but the result 1067 * of requests for rates greater than 1053257 is undefined (see AN205). 1068 * 1069 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 1070 * respectively, with an error less than 1%. The actual rates are determined 1071 * by 1072 * 1073 * div = round(freq / (2 x prescale x request)) 1074 * actual = freq / (2 x prescale x div) 1075 * 1076 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 1077 * or 1 otherwise. 1078 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 1079 * otherwise. 1080 */ 1081 static void cp210x_change_speed(struct tty_struct *tty, 1082 struct usb_serial_port *port, struct ktermios *old_termios) 1083 { 1084 struct usb_serial *serial = port->serial; 1085 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1086 u32 baud; 1087 1088 /* 1089 * This maps the requested rate to the actual rate, a valid rate on 1090 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed]. 1091 * 1092 * NOTE: B0 is not implemented. 1093 */ 1094 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed); 1095 1096 if (priv->use_actual_rate) 1097 baud = cp210x_get_actual_rate(baud); 1098 else if (baud < 1000000) 1099 baud = cp210x_get_an205_rate(baud); 1100 1101 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 1102 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { 1103 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 1104 if (old_termios) 1105 baud = old_termios->c_ospeed; 1106 else 1107 baud = 9600; 1108 } 1109 1110 tty_encode_baud_rate(tty, baud, baud); 1111 } 1112 1113 static void cp210x_enable_event_mode(struct usb_serial_port *port) 1114 { 1115 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1116 int ret; 1117 1118 if (port_priv->event_mode) 1119 return; 1120 1121 port_priv->event_state = ES_DATA; 1122 port_priv->event_mode = true; 1123 1124 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR); 1125 if (ret) { 1126 dev_err(&port->dev, "failed to enable events: %d\n", ret); 1127 port_priv->event_mode = false; 1128 } 1129 } 1130 1131 static void cp210x_disable_event_mode(struct usb_serial_port *port) 1132 { 1133 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1134 int ret; 1135 1136 if (!port_priv->event_mode) 1137 return; 1138 1139 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0); 1140 if (ret) { 1141 dev_err(&port->dev, "failed to disable events: %d\n", ret); 1142 return; 1143 } 1144 1145 port_priv->event_mode = false; 1146 } 1147 1148 static int cp210x_set_chars(struct usb_serial_port *port, 1149 struct cp210x_special_chars *chars) 1150 { 1151 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1152 struct usb_serial *serial = port->serial; 1153 void *dmabuf; 1154 int result; 1155 1156 dmabuf = kmemdup(chars, sizeof(*chars), GFP_KERNEL); 1157 if (!dmabuf) 1158 return -ENOMEM; 1159 1160 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 1161 CP210X_SET_CHARS, REQTYPE_HOST_TO_INTERFACE, 0, 1162 port_priv->bInterfaceNumber, 1163 dmabuf, sizeof(*chars), USB_CTRL_SET_TIMEOUT); 1164 1165 kfree(dmabuf); 1166 1167 if (result < 0) { 1168 dev_err(&port->dev, "failed to set special chars: %d\n", result); 1169 return result; 1170 } 1171 1172 return 0; 1173 } 1174 1175 static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b) 1176 { 1177 bool iflag_change, cc_change; 1178 1179 iflag_change = ((a->c_iflag ^ b->c_iflag) & (INPCK | IXON | IXOFF)); 1180 cc_change = a->c_cc[VSTART] != b->c_cc[VSTART] || 1181 a->c_cc[VSTOP] != b->c_cc[VSTOP]; 1182 1183 return tty_termios_hw_change(a, b) || iflag_change || cc_change; 1184 } 1185 1186 static void cp210x_set_flow_control(struct tty_struct *tty, 1187 struct usb_serial_port *port, struct ktermios *old_termios) 1188 { 1189 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1190 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1191 struct cp210x_special_chars chars; 1192 struct cp210x_flow_ctl flow_ctl; 1193 u32 flow_repl; 1194 u32 ctl_hs; 1195 int ret; 1196 1197 /* 1198 * Some CP2102N interpret ulXonLimit as ulFlowReplace (erratum 1199 * CP2102N_E104). Report back that flow control is not supported. 1200 */ 1201 if (priv->no_flow_control) { 1202 tty->termios.c_cflag &= ~CRTSCTS; 1203 tty->termios.c_iflag &= ~(IXON | IXOFF); 1204 } 1205 1206 if (old_termios && 1207 C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) && 1208 I_IXON(tty) == (old_termios->c_iflag & IXON) && 1209 I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) && 1210 START_CHAR(tty) == old_termios->c_cc[VSTART] && 1211 STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) { 1212 return; 1213 } 1214 1215 if (I_IXON(tty) || I_IXOFF(tty)) { 1216 memset(&chars, 0, sizeof(chars)); 1217 1218 chars.bXonChar = START_CHAR(tty); 1219 chars.bXoffChar = STOP_CHAR(tty); 1220 1221 ret = cp210x_set_chars(port, &chars); 1222 if (ret) 1223 return; 1224 } 1225 1226 mutex_lock(&port_priv->mutex); 1227 1228 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1229 sizeof(flow_ctl)); 1230 if (ret) 1231 goto out_unlock; 1232 1233 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1234 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1235 1236 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE; 1237 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE; 1238 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY; 1239 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1240 if (port_priv->dtr) 1241 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE; 1242 else 1243 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE; 1244 1245 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1246 if (C_CRTSCTS(tty)) { 1247 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE; 1248 if (port_priv->rts) 1249 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL; 1250 else 1251 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1252 port_priv->crtscts = true; 1253 } else { 1254 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE; 1255 if (port_priv->rts) 1256 flow_repl |= CP210X_SERIAL_RTS_ACTIVE; 1257 else 1258 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1259 port_priv->crtscts = false; 1260 } 1261 1262 if (I_IXOFF(tty)) { 1263 flow_repl |= CP210X_SERIAL_AUTO_RECEIVE; 1264 1265 flow_ctl.ulXonLimit = cpu_to_le32(128); 1266 flow_ctl.ulXoffLimit = cpu_to_le32(128); 1267 } else { 1268 flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE; 1269 } 1270 1271 if (I_IXON(tty)) 1272 flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT; 1273 else 1274 flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT; 1275 1276 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__, 1277 ctl_hs, flow_repl); 1278 1279 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1280 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1281 1282 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1283 sizeof(flow_ctl)); 1284 out_unlock: 1285 mutex_unlock(&port_priv->mutex); 1286 } 1287 1288 static void cp210x_set_termios(struct tty_struct *tty, 1289 struct usb_serial_port *port, struct ktermios *old_termios) 1290 { 1291 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1292 u16 bits; 1293 int ret; 1294 1295 if (old_termios && !cp210x_termios_change(&tty->termios, old_termios)) 1296 return; 1297 1298 if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed) 1299 cp210x_change_speed(tty, port, old_termios); 1300 1301 /* CP2101 only supports CS8, 1 stop bit and non-stick parity. */ 1302 if (priv->partnum == CP210X_PARTNUM_CP2101) { 1303 tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR); 1304 tty->termios.c_cflag |= CS8; 1305 } 1306 1307 bits = 0; 1308 1309 switch (C_CSIZE(tty)) { 1310 case CS5: 1311 bits |= BITS_DATA_5; 1312 break; 1313 case CS6: 1314 bits |= BITS_DATA_6; 1315 break; 1316 case CS7: 1317 bits |= BITS_DATA_7; 1318 break; 1319 case CS8: 1320 default: 1321 bits |= BITS_DATA_8; 1322 break; 1323 } 1324 1325 if (C_PARENB(tty)) { 1326 if (C_CMSPAR(tty)) { 1327 if (C_PARODD(tty)) 1328 bits |= BITS_PARITY_MARK; 1329 else 1330 bits |= BITS_PARITY_SPACE; 1331 } else { 1332 if (C_PARODD(tty)) 1333 bits |= BITS_PARITY_ODD; 1334 else 1335 bits |= BITS_PARITY_EVEN; 1336 } 1337 } 1338 1339 if (C_CSTOPB(tty)) 1340 bits |= BITS_STOP_2; 1341 else 1342 bits |= BITS_STOP_1; 1343 1344 ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1345 if (ret) 1346 dev_err(&port->dev, "failed to set line control: %d\n", ret); 1347 1348 cp210x_set_flow_control(tty, port, old_termios); 1349 1350 /* 1351 * Enable event-insertion mode only if input parity checking is 1352 * enabled for now. 1353 */ 1354 if (I_INPCK(tty)) 1355 cp210x_enable_event_mode(port); 1356 else 1357 cp210x_disable_event_mode(port); 1358 } 1359 1360 static int cp210x_tiocmset(struct tty_struct *tty, 1361 unsigned int set, unsigned int clear) 1362 { 1363 struct usb_serial_port *port = tty->driver_data; 1364 return cp210x_tiocmset_port(port, set, clear); 1365 } 1366 1367 static int cp210x_tiocmset_port(struct usb_serial_port *port, 1368 unsigned int set, unsigned int clear) 1369 { 1370 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1371 struct cp210x_flow_ctl flow_ctl; 1372 u32 ctl_hs, flow_repl; 1373 u16 control = 0; 1374 int ret; 1375 1376 mutex_lock(&port_priv->mutex); 1377 1378 if (set & TIOCM_RTS) { 1379 port_priv->rts = true; 1380 control |= CONTROL_RTS; 1381 control |= CONTROL_WRITE_RTS; 1382 } 1383 if (set & TIOCM_DTR) { 1384 port_priv->dtr = true; 1385 control |= CONTROL_DTR; 1386 control |= CONTROL_WRITE_DTR; 1387 } 1388 if (clear & TIOCM_RTS) { 1389 port_priv->rts = false; 1390 control &= ~CONTROL_RTS; 1391 control |= CONTROL_WRITE_RTS; 1392 } 1393 if (clear & TIOCM_DTR) { 1394 port_priv->dtr = false; 1395 control &= ~CONTROL_DTR; 1396 control |= CONTROL_WRITE_DTR; 1397 } 1398 1399 /* 1400 * Use SET_FLOW to set DTR and enable/disable auto-RTS when hardware 1401 * flow control is enabled. 1402 */ 1403 if (port_priv->crtscts && control & CONTROL_WRITE_RTS) { 1404 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1405 sizeof(flow_ctl)); 1406 if (ret) 1407 goto out_unlock; 1408 1409 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1410 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1411 1412 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1413 if (port_priv->dtr) 1414 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE; 1415 else 1416 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE; 1417 1418 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1419 if (port_priv->rts) 1420 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL; 1421 else 1422 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1423 1424 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1425 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1426 1427 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", 1428 __func__, ctl_hs, flow_repl); 1429 1430 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1431 sizeof(flow_ctl)); 1432 } else { 1433 dev_dbg(&port->dev, "%s - control = 0x%04x\n", __func__, control); 1434 1435 ret = cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1436 } 1437 out_unlock: 1438 mutex_unlock(&port_priv->mutex); 1439 1440 return ret; 1441 } 1442 1443 static void cp210x_dtr_rts(struct usb_serial_port *port, int on) 1444 { 1445 if (on) 1446 cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0); 1447 else 1448 cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS); 1449 } 1450 1451 static int cp210x_tiocmget(struct tty_struct *tty) 1452 { 1453 struct usb_serial_port *port = tty->driver_data; 1454 u8 control; 1455 int result; 1456 1457 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1458 if (result) 1459 return result; 1460 1461 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1462 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1463 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1464 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1465 |((control & CONTROL_RING)? TIOCM_RI : 0) 1466 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1467 1468 dev_dbg(&port->dev, "%s - control = 0x%02x\n", __func__, control); 1469 1470 return result; 1471 } 1472 1473 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 1474 { 1475 struct usb_serial_port *port = tty->driver_data; 1476 u16 state; 1477 1478 if (break_state == 0) 1479 state = BREAK_OFF; 1480 else 1481 state = BREAK_ON; 1482 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1483 state == BREAK_OFF ? "off" : "on"); 1484 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1485 } 1486 1487 #ifdef CONFIG_GPIOLIB 1488 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio) 1489 { 1490 struct usb_serial *serial = gpiochip_get_data(gc); 1491 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1492 u8 req_type; 1493 u16 mask; 1494 int result; 1495 int len; 1496 1497 result = usb_autopm_get_interface(serial->interface); 1498 if (result) 1499 return result; 1500 1501 switch (priv->partnum) { 1502 case CP210X_PARTNUM_CP2105: 1503 req_type = REQTYPE_INTERFACE_TO_HOST; 1504 len = 1; 1505 break; 1506 case CP210X_PARTNUM_CP2108: 1507 req_type = REQTYPE_INTERFACE_TO_HOST; 1508 len = 2; 1509 break; 1510 default: 1511 req_type = REQTYPE_DEVICE_TO_HOST; 1512 len = 1; 1513 break; 1514 } 1515 1516 mask = 0; 1517 result = cp210x_read_vendor_block(serial, req_type, CP210X_READ_LATCH, 1518 &mask, len); 1519 1520 usb_autopm_put_interface(serial->interface); 1521 1522 if (result < 0) 1523 return result; 1524 1525 le16_to_cpus(&mask); 1526 1527 return !!(mask & BIT(gpio)); 1528 } 1529 1530 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value) 1531 { 1532 struct usb_serial *serial = gpiochip_get_data(gc); 1533 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1534 struct cp210x_gpio_write16 buf16; 1535 struct cp210x_gpio_write buf; 1536 u16 mask, state; 1537 u16 wIndex; 1538 int result; 1539 1540 if (value == 1) 1541 state = BIT(gpio); 1542 else 1543 state = 0; 1544 1545 mask = BIT(gpio); 1546 1547 result = usb_autopm_get_interface(serial->interface); 1548 if (result) 1549 goto out; 1550 1551 switch (priv->partnum) { 1552 case CP210X_PARTNUM_CP2105: 1553 buf.mask = (u8)mask; 1554 buf.state = (u8)state; 1555 result = cp210x_write_vendor_block(serial, 1556 REQTYPE_HOST_TO_INTERFACE, 1557 CP210X_WRITE_LATCH, &buf, 1558 sizeof(buf)); 1559 break; 1560 case CP210X_PARTNUM_CP2108: 1561 buf16.mask = cpu_to_le16(mask); 1562 buf16.state = cpu_to_le16(state); 1563 result = cp210x_write_vendor_block(serial, 1564 REQTYPE_HOST_TO_INTERFACE, 1565 CP210X_WRITE_LATCH, &buf16, 1566 sizeof(buf16)); 1567 break; 1568 default: 1569 wIndex = state << 8 | mask; 1570 result = usb_control_msg(serial->dev, 1571 usb_sndctrlpipe(serial->dev, 0), 1572 CP210X_VENDOR_SPECIFIC, 1573 REQTYPE_HOST_TO_DEVICE, 1574 CP210X_WRITE_LATCH, 1575 wIndex, 1576 NULL, 0, USB_CTRL_SET_TIMEOUT); 1577 break; 1578 } 1579 1580 usb_autopm_put_interface(serial->interface); 1581 out: 1582 if (result < 0) { 1583 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n", 1584 result); 1585 } 1586 } 1587 1588 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio) 1589 { 1590 struct usb_serial *serial = gpiochip_get_data(gc); 1591 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1592 1593 return priv->gpio_input & BIT(gpio); 1594 } 1595 1596 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio) 1597 { 1598 struct usb_serial *serial = gpiochip_get_data(gc); 1599 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1600 1601 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1602 /* hardware does not support an input mode */ 1603 return -ENOTSUPP; 1604 } 1605 1606 /* push-pull pins cannot be changed to be inputs */ 1607 if (priv->gpio_pushpull & BIT(gpio)) 1608 return -EINVAL; 1609 1610 /* make sure to release pin if it is being driven low */ 1611 cp210x_gpio_set(gc, gpio, 1); 1612 1613 priv->gpio_input |= BIT(gpio); 1614 1615 return 0; 1616 } 1617 1618 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio, 1619 int value) 1620 { 1621 struct usb_serial *serial = gpiochip_get_data(gc); 1622 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1623 1624 priv->gpio_input &= ~BIT(gpio); 1625 cp210x_gpio_set(gc, gpio, value); 1626 1627 return 0; 1628 } 1629 1630 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio, 1631 unsigned long config) 1632 { 1633 struct usb_serial *serial = gpiochip_get_data(gc); 1634 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1635 enum pin_config_param param = pinconf_to_config_param(config); 1636 1637 /* Succeed only if in correct mode (this can't be set at runtime) */ 1638 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) && 1639 (priv->gpio_pushpull & BIT(gpio))) 1640 return 0; 1641 1642 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) && 1643 !(priv->gpio_pushpull & BIT(gpio))) 1644 return 0; 1645 1646 return -ENOTSUPP; 1647 } 1648 1649 static int cp210x_gpio_init_valid_mask(struct gpio_chip *gc, 1650 unsigned long *valid_mask, unsigned int ngpios) 1651 { 1652 struct usb_serial *serial = gpiochip_get_data(gc); 1653 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1654 struct device *dev = &serial->interface->dev; 1655 unsigned long altfunc_mask = priv->gpio_altfunc; 1656 1657 bitmap_complement(valid_mask, &altfunc_mask, ngpios); 1658 1659 if (bitmap_empty(valid_mask, ngpios)) 1660 dev_dbg(dev, "no pin configured for GPIO\n"); 1661 else 1662 dev_dbg(dev, "GPIO.%*pbl configured for GPIO\n", ngpios, 1663 valid_mask); 1664 return 0; 1665 } 1666 1667 /* 1668 * This function is for configuring GPIO using shared pins, where other signals 1669 * are made unavailable by configuring the use of GPIO. This is believed to be 1670 * only applicable to the cp2105 at this point, the other devices supported by 1671 * this driver that provide GPIO do so in a way that does not impact other 1672 * signals and are thus expected to have very different initialisation. 1673 */ 1674 static int cp2105_gpioconf_init(struct usb_serial *serial) 1675 { 1676 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1677 struct cp210x_pin_mode mode; 1678 struct cp210x_dual_port_config config; 1679 u8 intf_num = cp210x_interface_num(serial); 1680 u8 iface_config; 1681 int result; 1682 1683 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1684 CP210X_GET_DEVICEMODE, &mode, 1685 sizeof(mode)); 1686 if (result < 0) 1687 return result; 1688 1689 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1690 CP210X_GET_PORTCONFIG, &config, 1691 sizeof(config)); 1692 if (result < 0) 1693 return result; 1694 1695 /* 2 banks of GPIO - One for the pins taken from each serial port */ 1696 if (intf_num == 0) { 1697 if (mode.eci == CP210X_PIN_MODE_MODEM) { 1698 /* mark all GPIOs of this interface as reserved */ 1699 priv->gpio_altfunc = 0xff; 1700 return 0; 1701 } 1702 1703 iface_config = config.eci_cfg; 1704 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1705 CP210X_ECI_GPIO_MODE_MASK) >> 1706 CP210X_ECI_GPIO_MODE_OFFSET); 1707 priv->gc.ngpio = 2; 1708 } else if (intf_num == 1) { 1709 if (mode.sci == CP210X_PIN_MODE_MODEM) { 1710 /* mark all GPIOs of this interface as reserved */ 1711 priv->gpio_altfunc = 0xff; 1712 return 0; 1713 } 1714 1715 iface_config = config.sci_cfg; 1716 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1717 CP210X_SCI_GPIO_MODE_MASK) >> 1718 CP210X_SCI_GPIO_MODE_OFFSET); 1719 priv->gc.ngpio = 3; 1720 } else { 1721 return -ENODEV; 1722 } 1723 1724 /* mark all pins which are not in GPIO mode */ 1725 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */ 1726 priv->gpio_altfunc |= BIT(0); 1727 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */ 1728 CP2105_GPIO1_RS485_MODE)) 1729 priv->gpio_altfunc |= BIT(1); 1730 1731 /* driver implementation for CP2105 only supports outputs */ 1732 priv->gpio_input = 0; 1733 1734 return 0; 1735 } 1736 1737 static int cp2104_gpioconf_init(struct usb_serial *serial) 1738 { 1739 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1740 struct cp210x_single_port_config config; 1741 u8 iface_config; 1742 u8 gpio_latch; 1743 int result; 1744 u8 i; 1745 1746 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1747 CP210X_GET_PORTCONFIG, &config, 1748 sizeof(config)); 1749 if (result < 0) 1750 return result; 1751 1752 priv->gc.ngpio = 4; 1753 1754 iface_config = config.device_cfg; 1755 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1756 CP210X_GPIO_MODE_MASK) >> 1757 CP210X_GPIO_MODE_OFFSET); 1758 gpio_latch = (u8)((le16_to_cpu(config.reset_state) & 1759 CP210X_GPIO_MODE_MASK) >> 1760 CP210X_GPIO_MODE_OFFSET); 1761 1762 /* mark all pins which are not in GPIO mode */ 1763 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */ 1764 priv->gpio_altfunc |= BIT(0); 1765 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */ 1766 priv->gpio_altfunc |= BIT(1); 1767 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */ 1768 priv->gpio_altfunc |= BIT(2); 1769 1770 /* 1771 * Like CP2102N, CP2104 has also no strict input and output pin 1772 * modes. 1773 * Do the same input mode emulation as CP2102N. 1774 */ 1775 for (i = 0; i < priv->gc.ngpio; ++i) { 1776 /* 1777 * Set direction to "input" iff pin is open-drain and reset 1778 * value is 1. 1779 */ 1780 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1781 priv->gpio_input |= BIT(i); 1782 } 1783 1784 return 0; 1785 } 1786 1787 static int cp2108_gpio_init(struct usb_serial *serial) 1788 { 1789 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1790 struct cp210x_quad_port_config config; 1791 u16 gpio_latch; 1792 int result; 1793 u8 i; 1794 1795 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1796 CP210X_GET_PORTCONFIG, &config, 1797 sizeof(config)); 1798 if (result < 0) 1799 return result; 1800 1801 priv->gc.ngpio = 16; 1802 priv->gpio_pushpull = le16_to_cpu(config.reset_state.gpio_mode_pb1); 1803 gpio_latch = le16_to_cpu(config.reset_state.gpio_latch_pb1); 1804 1805 /* 1806 * Mark all pins which are not in GPIO mode. 1807 * 1808 * Refer to table 9.1 "GPIO Mode alternate Functions" in the datasheet: 1809 * https://www.silabs.com/documents/public/data-sheets/cp2108-datasheet.pdf 1810 * 1811 * Alternate functions of GPIO0 to GPIO3 are determine by enhancedfxn_ifc[0] 1812 * and the similarly for the other pins; enhancedfxn_ifc[1]: GPIO4 to GPIO7, 1813 * enhancedfxn_ifc[2]: GPIO8 to GPIO11, enhancedfxn_ifc[3]: GPIO12 to GPIO15. 1814 */ 1815 for (i = 0; i < 4; i++) { 1816 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_TXLED) 1817 priv->gpio_altfunc |= BIT(i * 4); 1818 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RXLED) 1819 priv->gpio_altfunc |= BIT((i * 4) + 1); 1820 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RS485) 1821 priv->gpio_altfunc |= BIT((i * 4) + 2); 1822 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_CLOCK) 1823 priv->gpio_altfunc |= BIT((i * 4) + 3); 1824 } 1825 1826 /* 1827 * Like CP2102N, CP2108 has also no strict input and output pin 1828 * modes. Do the same input mode emulation as CP2102N. 1829 */ 1830 for (i = 0; i < priv->gc.ngpio; ++i) { 1831 /* 1832 * Set direction to "input" iff pin is open-drain and reset 1833 * value is 1. 1834 */ 1835 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1836 priv->gpio_input |= BIT(i); 1837 } 1838 1839 return 0; 1840 } 1841 1842 static int cp2102n_gpioconf_init(struct usb_serial *serial) 1843 { 1844 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1845 const u16 config_size = 0x02a6; 1846 u8 gpio_rst_latch; 1847 u8 config_version; 1848 u8 gpio_pushpull; 1849 u8 *config_buf; 1850 u8 gpio_latch; 1851 u8 gpio_ctrl; 1852 int result; 1853 u8 i; 1854 1855 /* 1856 * Retrieve device configuration from the device. 1857 * The array received contains all customization settings done at the 1858 * factory/manufacturer. Format of the array is documented at the 1859 * time of writing at: 1860 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa 1861 */ 1862 config_buf = kmalloc(config_size, GFP_KERNEL); 1863 if (!config_buf) 1864 return -ENOMEM; 1865 1866 result = cp210x_read_vendor_block(serial, 1867 REQTYPE_DEVICE_TO_HOST, 1868 CP210X_READ_2NCONFIG, 1869 config_buf, 1870 config_size); 1871 if (result < 0) { 1872 kfree(config_buf); 1873 return result; 1874 } 1875 1876 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX]; 1877 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX]; 1878 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX]; 1879 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX]; 1880 1881 kfree(config_buf); 1882 1883 /* Make sure this is a config format we understand. */ 1884 if (config_version != 0x01) 1885 return -ENOTSUPP; 1886 1887 priv->gc.ngpio = 4; 1888 1889 /* 1890 * Get default pin states after reset. Needed so we can determine 1891 * the direction of an open-drain pin. 1892 */ 1893 gpio_latch = (gpio_rst_latch >> 3) & 0x0f; 1894 1895 /* 0 indicates open-drain mode, 1 is push-pull */ 1896 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f; 1897 1898 /* 0 indicates GPIO mode, 1 is alternate function */ 1899 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) { 1900 /* QFN20 is special... */ 1901 if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE) /* GPIO 0 */ 1902 priv->gpio_altfunc |= BIT(0); 1903 if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */ 1904 priv->gpio_altfunc |= BIT(1); 1905 if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */ 1906 priv->gpio_altfunc |= BIT(2); 1907 if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */ 1908 priv->gpio_altfunc |= BIT(3); 1909 } else { 1910 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f; 1911 } 1912 1913 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) { 1914 /* 1915 * For the QFN28 package, GPIO4-6 are controlled by 1916 * the low three bits of the mode/latch fields. 1917 * Contrary to the document linked above, the bits for 1918 * the SUSPEND pins are elsewhere. No alternate 1919 * function is available for these pins. 1920 */ 1921 priv->gc.ngpio = 7; 1922 gpio_latch |= (gpio_rst_latch & 7) << 4; 1923 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4; 1924 } 1925 1926 /* 1927 * The CP2102N does not strictly has input and output pin modes, 1928 * it only knows open-drain and push-pull modes which is set at 1929 * factory. An open-drain pin can function both as an 1930 * input or an output. We emulate input mode for open-drain pins 1931 * by making sure they are not driven low, and we do not allow 1932 * push-pull pins to be set as an input. 1933 */ 1934 for (i = 0; i < priv->gc.ngpio; ++i) { 1935 /* 1936 * Set direction to "input" iff pin is open-drain and reset 1937 * value is 1. 1938 */ 1939 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1940 priv->gpio_input |= BIT(i); 1941 } 1942 1943 return 0; 1944 } 1945 1946 static int cp210x_gpio_init(struct usb_serial *serial) 1947 { 1948 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1949 int result; 1950 1951 switch (priv->partnum) { 1952 case CP210X_PARTNUM_CP2104: 1953 result = cp2104_gpioconf_init(serial); 1954 break; 1955 case CP210X_PARTNUM_CP2105: 1956 result = cp2105_gpioconf_init(serial); 1957 break; 1958 case CP210X_PARTNUM_CP2108: 1959 /* 1960 * The GPIOs are not tied to any specific port so only register 1961 * once for interface 0. 1962 */ 1963 if (cp210x_interface_num(serial) != 0) 1964 return 0; 1965 result = cp2108_gpio_init(serial); 1966 break; 1967 case CP210X_PARTNUM_CP2102N_QFN28: 1968 case CP210X_PARTNUM_CP2102N_QFN24: 1969 case CP210X_PARTNUM_CP2102N_QFN20: 1970 result = cp2102n_gpioconf_init(serial); 1971 break; 1972 default: 1973 return 0; 1974 } 1975 1976 if (result < 0) 1977 return result; 1978 1979 priv->gc.label = "cp210x"; 1980 priv->gc.get_direction = cp210x_gpio_direction_get; 1981 priv->gc.direction_input = cp210x_gpio_direction_input; 1982 priv->gc.direction_output = cp210x_gpio_direction_output; 1983 priv->gc.get = cp210x_gpio_get; 1984 priv->gc.set = cp210x_gpio_set; 1985 priv->gc.set_config = cp210x_gpio_set_config; 1986 priv->gc.init_valid_mask = cp210x_gpio_init_valid_mask; 1987 priv->gc.owner = THIS_MODULE; 1988 priv->gc.parent = &serial->interface->dev; 1989 priv->gc.base = -1; 1990 priv->gc.can_sleep = true; 1991 1992 result = gpiochip_add_data(&priv->gc, serial); 1993 if (!result) 1994 priv->gpio_registered = true; 1995 1996 return result; 1997 } 1998 1999 static void cp210x_gpio_remove(struct usb_serial *serial) 2000 { 2001 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2002 2003 if (priv->gpio_registered) { 2004 gpiochip_remove(&priv->gc); 2005 priv->gpio_registered = false; 2006 } 2007 } 2008 2009 #else 2010 2011 static int cp210x_gpio_init(struct usb_serial *serial) 2012 { 2013 return 0; 2014 } 2015 2016 static void cp210x_gpio_remove(struct usb_serial *serial) 2017 { 2018 /* Nothing to do */ 2019 } 2020 2021 #endif 2022 2023 static int cp210x_port_probe(struct usb_serial_port *port) 2024 { 2025 struct usb_serial *serial = port->serial; 2026 struct cp210x_port_private *port_priv; 2027 2028 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 2029 if (!port_priv) 2030 return -ENOMEM; 2031 2032 port_priv->bInterfaceNumber = cp210x_interface_num(serial); 2033 mutex_init(&port_priv->mutex); 2034 2035 usb_set_serial_port_data(port, port_priv); 2036 2037 return 0; 2038 } 2039 2040 static void cp210x_port_remove(struct usb_serial_port *port) 2041 { 2042 struct cp210x_port_private *port_priv; 2043 2044 port_priv = usb_get_serial_port_data(port); 2045 kfree(port_priv); 2046 } 2047 2048 static void cp210x_init_max_speed(struct usb_serial *serial) 2049 { 2050 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2051 bool use_actual_rate = false; 2052 speed_t min = 300; 2053 speed_t max; 2054 2055 switch (priv->partnum) { 2056 case CP210X_PARTNUM_CP2101: 2057 max = 921600; 2058 break; 2059 case CP210X_PARTNUM_CP2102: 2060 case CP210X_PARTNUM_CP2103: 2061 max = 1000000; 2062 break; 2063 case CP210X_PARTNUM_CP2104: 2064 use_actual_rate = true; 2065 max = 2000000; 2066 break; 2067 case CP210X_PARTNUM_CP2108: 2068 max = 2000000; 2069 break; 2070 case CP210X_PARTNUM_CP2105: 2071 if (cp210x_interface_num(serial) == 0) { 2072 use_actual_rate = true; 2073 max = 2000000; /* ECI */ 2074 } else { 2075 min = 2400; 2076 max = 921600; /* SCI */ 2077 } 2078 break; 2079 case CP210X_PARTNUM_CP2102N_QFN28: 2080 case CP210X_PARTNUM_CP2102N_QFN24: 2081 case CP210X_PARTNUM_CP2102N_QFN20: 2082 use_actual_rate = true; 2083 max = 3000000; 2084 break; 2085 default: 2086 max = 2000000; 2087 break; 2088 } 2089 2090 priv->min_speed = min; 2091 priv->max_speed = max; 2092 priv->use_actual_rate = use_actual_rate; 2093 } 2094 2095 static int cp210x_get_fw_version(struct usb_serial *serial, u16 value) 2096 { 2097 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2098 u8 ver[3]; 2099 int ret; 2100 2101 ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, value, 2102 ver, sizeof(ver)); 2103 if (ret) 2104 return ret; 2105 2106 dev_dbg(&serial->interface->dev, "%s - %d.%d.%d\n", __func__, 2107 ver[0], ver[1], ver[2]); 2108 2109 priv->fw_version = ver[0] << 16 | ver[1] << 8 | ver[2]; 2110 2111 return 0; 2112 } 2113 2114 static void cp210x_determine_quirks(struct usb_serial *serial) 2115 { 2116 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2117 int ret; 2118 2119 switch (priv->partnum) { 2120 case CP210X_PARTNUM_CP2102N_QFN28: 2121 case CP210X_PARTNUM_CP2102N_QFN24: 2122 case CP210X_PARTNUM_CP2102N_QFN20: 2123 ret = cp210x_get_fw_version(serial, CP210X_GET_FW_VER_2N); 2124 if (ret) 2125 break; 2126 if (priv->fw_version <= 0x10004) 2127 priv->no_flow_control = true; 2128 break; 2129 default: 2130 break; 2131 } 2132 } 2133 2134 static int cp210x_attach(struct usb_serial *serial) 2135 { 2136 int result; 2137 struct cp210x_serial_private *priv; 2138 2139 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 2140 if (!priv) 2141 return -ENOMEM; 2142 2143 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 2144 CP210X_GET_PARTNUM, &priv->partnum, 2145 sizeof(priv->partnum)); 2146 if (result < 0) { 2147 dev_warn(&serial->interface->dev, 2148 "querying part number failed\n"); 2149 priv->partnum = CP210X_PARTNUM_UNKNOWN; 2150 } 2151 2152 usb_set_serial_data(serial, priv); 2153 2154 cp210x_determine_quirks(serial); 2155 cp210x_init_max_speed(serial); 2156 2157 result = cp210x_gpio_init(serial); 2158 if (result < 0) { 2159 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n", 2160 result); 2161 } 2162 2163 return 0; 2164 } 2165 2166 static void cp210x_disconnect(struct usb_serial *serial) 2167 { 2168 cp210x_gpio_remove(serial); 2169 } 2170 2171 static void cp210x_release(struct usb_serial *serial) 2172 { 2173 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2174 2175 cp210x_gpio_remove(serial); 2176 2177 kfree(priv); 2178 } 2179 2180 module_usb_serial_driver(serial_drivers, id_table); 2181 2182 MODULE_DESCRIPTION(DRIVER_DESC); 2183 MODULE_LICENSE("GPL v2"); 2184