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