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 const struct ktermios *); 35 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *, 36 const 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(0x0404, 0x034C) }, /* NCR Retail IO Box */ 55 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */ 56 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */ 57 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 58 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 59 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */ 60 { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */ 61 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */ 62 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */ 63 { USB_DEVICE(0x0908, 0x0070) }, /* Siemens SCALANCE LPE-9000 USB Serial Console */ 64 { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */ 65 { USB_DEVICE(0x0988, 0x0578) }, /* Teraoka AD2000 */ 66 { USB_DEVICE(0x0B00, 0x3070) }, /* Ingenico 3070 */ 67 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */ 68 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */ 69 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */ 70 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */ 71 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */ 72 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */ 73 { USB_DEVICE(0x106F, 0x0003) }, /* CPI / Money Controls Bulk Coin Recycler */ 74 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */ 75 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */ 76 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */ 77 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */ 78 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */ 79 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */ 80 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */ 81 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */ 82 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */ 83 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */ 84 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */ 85 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */ 86 { USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */ 87 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */ 88 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */ 89 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */ 90 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */ 91 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */ 92 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */ 93 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */ 94 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */ 95 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */ 96 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */ 97 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */ 98 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */ 99 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */ 100 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */ 101 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */ 102 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */ 103 { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */ 104 { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */ 105 { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */ 106 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */ 107 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */ 108 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */ 109 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */ 110 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */ 111 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */ 112 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */ 113 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */ 114 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */ 115 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */ 116 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */ 117 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */ 118 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */ 119 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */ 120 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */ 121 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */ 122 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */ 123 { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */ 124 { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */ 125 { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */ 126 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */ 127 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */ 128 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */ 129 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */ 130 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */ 131 { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */ 132 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */ 133 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ 134 { USB_DEVICE(0x10C4, 0x8414) }, /* Decagon USB Cable Adapter */ 135 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ 136 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 137 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */ 138 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ 139 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */ 140 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */ 141 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */ 142 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */ 143 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ 144 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ 145 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */ 146 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 147 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 148 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */ 149 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */ 150 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */ 151 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */ 152 { USB_DEVICE(0x10C4, 0x88D8) }, /* Acuity Brands nLight Air Adapter */ 153 { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */ 154 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */ 155 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */ 156 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */ 157 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */ 158 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */ 159 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */ 160 { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */ 161 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */ 162 { USB_DEVICE(0x10C4, 0x8A5B) }, /* CEL EM3588 ZigBee USB Stick */ 163 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */ 164 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */ 165 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 166 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 167 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */ 168 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 169 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 170 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */ 171 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */ 172 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 173 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 174 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 175 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 176 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 177 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 178 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */ 179 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */ 180 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 181 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 182 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */ 183 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */ 184 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */ 185 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 186 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */ 187 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */ 188 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */ 189 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */ 190 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */ 191 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */ 192 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 193 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ 194 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ 195 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ 196 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ 197 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ 198 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ 199 { USB_DEVICE(0x17A8, 0x0011) }, /* Kamstrup 444 MHz RF sniffer */ 200 { USB_DEVICE(0x17A8, 0x0013) }, /* Kamstrup 870 MHz RF sniffer */ 201 { USB_DEVICE(0x17A8, 0x0101) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Int Ant) */ 202 { USB_DEVICE(0x17A8, 0x0102) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Ext Ant) */ 203 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 204 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 205 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 206 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */ 207 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */ 208 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */ 209 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */ 210 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */ 211 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */ 212 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */ 213 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */ 214 { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 M.2 Key E serial interface */ 215 { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 Display serial interface */ 216 { USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */ 217 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */ 218 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */ 219 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */ 220 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */ 221 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 222 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */ 223 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 224 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 225 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 226 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 227 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 228 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 229 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 230 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 231 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 232 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 233 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 234 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 235 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 236 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 237 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 238 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 239 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 240 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 241 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 242 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 243 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 244 { USB_DEVICE(0x2184, 0x0030) }, /* GW Instek GDM-834x Digital Multimeter */ 245 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */ 246 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 247 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 248 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 249 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */ 250 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 251 { } /* Terminating Entry */ 252 }; 253 254 MODULE_DEVICE_TABLE(usb, id_table); 255 256 struct cp210x_serial_private { 257 #ifdef CONFIG_GPIOLIB 258 struct gpio_chip gc; 259 bool gpio_registered; 260 u16 gpio_pushpull; 261 u16 gpio_altfunc; 262 u16 gpio_input; 263 #endif 264 u8 partnum; 265 u32 fw_version; 266 speed_t min_speed; 267 speed_t max_speed; 268 bool use_actual_rate; 269 bool no_flow_control; 270 bool no_event_mode; 271 }; 272 273 enum cp210x_event_state { 274 ES_DATA, 275 ES_ESCAPE, 276 ES_LSR, 277 ES_LSR_DATA_0, 278 ES_LSR_DATA_1, 279 ES_MSR 280 }; 281 282 struct cp210x_port_private { 283 u8 bInterfaceNumber; 284 bool event_mode; 285 enum cp210x_event_state event_state; 286 u8 lsr; 287 288 struct mutex mutex; 289 bool crtscts; 290 bool dtr; 291 bool rts; 292 }; 293 294 static struct usb_serial_driver cp210x_device = { 295 .driver = { 296 .owner = THIS_MODULE, 297 .name = "cp210x", 298 }, 299 .id_table = id_table, 300 .num_ports = 1, 301 .bulk_in_size = 256, 302 .bulk_out_size = 256, 303 .open = cp210x_open, 304 .close = cp210x_close, 305 .break_ctl = cp210x_break_ctl, 306 .set_termios = cp210x_set_termios, 307 .tx_empty = cp210x_tx_empty, 308 .throttle = usb_serial_generic_throttle, 309 .unthrottle = usb_serial_generic_unthrottle, 310 .tiocmget = cp210x_tiocmget, 311 .tiocmset = cp210x_tiocmset, 312 .get_icount = usb_serial_generic_get_icount, 313 .attach = cp210x_attach, 314 .disconnect = cp210x_disconnect, 315 .release = cp210x_release, 316 .port_probe = cp210x_port_probe, 317 .port_remove = cp210x_port_remove, 318 .dtr_rts = cp210x_dtr_rts, 319 .process_read_urb = cp210x_process_read_urb, 320 }; 321 322 static struct usb_serial_driver * const serial_drivers[] = { 323 &cp210x_device, NULL 324 }; 325 326 /* Config request types */ 327 #define REQTYPE_HOST_TO_INTERFACE 0x41 328 #define REQTYPE_INTERFACE_TO_HOST 0xc1 329 #define REQTYPE_HOST_TO_DEVICE 0x40 330 #define REQTYPE_DEVICE_TO_HOST 0xc0 331 332 /* Config request codes */ 333 #define CP210X_IFC_ENABLE 0x00 334 #define CP210X_SET_BAUDDIV 0x01 335 #define CP210X_GET_BAUDDIV 0x02 336 #define CP210X_SET_LINE_CTL 0x03 337 #define CP210X_GET_LINE_CTL 0x04 338 #define CP210X_SET_BREAK 0x05 339 #define CP210X_IMM_CHAR 0x06 340 #define CP210X_SET_MHS 0x07 341 #define CP210X_GET_MDMSTS 0x08 342 #define CP210X_SET_XON 0x09 343 #define CP210X_SET_XOFF 0x0A 344 #define CP210X_SET_EVENTMASK 0x0B 345 #define CP210X_GET_EVENTMASK 0x0C 346 #define CP210X_SET_CHAR 0x0D 347 #define CP210X_GET_CHARS 0x0E 348 #define CP210X_GET_PROPS 0x0F 349 #define CP210X_GET_COMM_STATUS 0x10 350 #define CP210X_RESET 0x11 351 #define CP210X_PURGE 0x12 352 #define CP210X_SET_FLOW 0x13 353 #define CP210X_GET_FLOW 0x14 354 #define CP210X_EMBED_EVENTS 0x15 355 #define CP210X_GET_EVENTSTATE 0x16 356 #define CP210X_SET_CHARS 0x19 357 #define CP210X_GET_BAUDRATE 0x1D 358 #define CP210X_SET_BAUDRATE 0x1E 359 #define CP210X_VENDOR_SPECIFIC 0xFF 360 361 /* CP210X_IFC_ENABLE */ 362 #define UART_ENABLE 0x0001 363 #define UART_DISABLE 0x0000 364 365 /* CP210X_(SET|GET)_BAUDDIV */ 366 #define BAUD_RATE_GEN_FREQ 0x384000 367 368 /* CP210X_(SET|GET)_LINE_CTL */ 369 #define BITS_DATA_MASK 0X0f00 370 #define BITS_DATA_5 0X0500 371 #define BITS_DATA_6 0X0600 372 #define BITS_DATA_7 0X0700 373 #define BITS_DATA_8 0X0800 374 #define BITS_DATA_9 0X0900 375 376 #define BITS_PARITY_MASK 0x00f0 377 #define BITS_PARITY_NONE 0x0000 378 #define BITS_PARITY_ODD 0x0010 379 #define BITS_PARITY_EVEN 0x0020 380 #define BITS_PARITY_MARK 0x0030 381 #define BITS_PARITY_SPACE 0x0040 382 383 #define BITS_STOP_MASK 0x000f 384 #define BITS_STOP_1 0x0000 385 #define BITS_STOP_1_5 0x0001 386 #define BITS_STOP_2 0x0002 387 388 /* CP210X_SET_BREAK */ 389 #define BREAK_ON 0x0001 390 #define BREAK_OFF 0x0000 391 392 /* CP210X_(SET_MHS|GET_MDMSTS) */ 393 #define CONTROL_DTR 0x0001 394 #define CONTROL_RTS 0x0002 395 #define CONTROL_CTS 0x0010 396 #define CONTROL_DSR 0x0020 397 #define CONTROL_RING 0x0040 398 #define CONTROL_DCD 0x0080 399 #define CONTROL_WRITE_DTR 0x0100 400 #define CONTROL_WRITE_RTS 0x0200 401 402 /* CP210X_(GET|SET)_CHARS */ 403 struct cp210x_special_chars { 404 u8 bEofChar; 405 u8 bErrorChar; 406 u8 bBreakChar; 407 u8 bEventChar; 408 u8 bXonChar; 409 u8 bXoffChar; 410 }; 411 412 /* CP210X_VENDOR_SPECIFIC values */ 413 #define CP210X_GET_FW_VER 0x000E 414 #define CP210X_READ_2NCONFIG 0x000E 415 #define CP210X_GET_FW_VER_2N 0x0010 416 #define CP210X_READ_LATCH 0x00C2 417 #define CP210X_GET_PARTNUM 0x370B 418 #define CP210X_GET_PORTCONFIG 0x370C 419 #define CP210X_GET_DEVICEMODE 0x3711 420 #define CP210X_WRITE_LATCH 0x37E1 421 422 /* Part number definitions */ 423 #define CP210X_PARTNUM_CP2101 0x01 424 #define CP210X_PARTNUM_CP2102 0x02 425 #define CP210X_PARTNUM_CP2103 0x03 426 #define CP210X_PARTNUM_CP2104 0x04 427 #define CP210X_PARTNUM_CP2105 0x05 428 #define CP210X_PARTNUM_CP2108 0x08 429 #define CP210X_PARTNUM_CP2102N_QFN28 0x20 430 #define CP210X_PARTNUM_CP2102N_QFN24 0x21 431 #define CP210X_PARTNUM_CP2102N_QFN20 0x22 432 #define CP210X_PARTNUM_UNKNOWN 0xFF 433 434 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 435 struct cp210x_comm_status { 436 __le32 ulErrors; 437 __le32 ulHoldReasons; 438 __le32 ulAmountInInQueue; 439 __le32 ulAmountInOutQueue; 440 u8 bEofReceived; 441 u8 bWaitForImmediate; 442 u8 bReserved; 443 } __packed; 444 445 /* 446 * CP210X_PURGE - 16 bits passed in wValue of USB request. 447 * SiLabs app note AN571 gives a strange description of the 4 bits: 448 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 449 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 450 */ 451 #define PURGE_ALL 0x000f 452 453 /* CP210X_EMBED_EVENTS */ 454 #define CP210X_ESCCHAR 0xec 455 456 #define CP210X_LSR_OVERRUN BIT(1) 457 #define CP210X_LSR_PARITY BIT(2) 458 #define CP210X_LSR_FRAME BIT(3) 459 #define CP210X_LSR_BREAK BIT(4) 460 461 462 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */ 463 struct cp210x_flow_ctl { 464 __le32 ulControlHandshake; 465 __le32 ulFlowReplace; 466 __le32 ulXonLimit; 467 __le32 ulXoffLimit; 468 }; 469 470 /* cp210x_flow_ctl::ulControlHandshake */ 471 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0) 472 #define CP210X_SERIAL_DTR_INACTIVE (0 << 0) 473 #define CP210X_SERIAL_DTR_ACTIVE (1 << 0) 474 #define CP210X_SERIAL_DTR_FLOW_CTL (2 << 0) 475 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3) 476 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4) 477 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5) 478 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6) 479 480 /* cp210x_flow_ctl::ulFlowReplace */ 481 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0) 482 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1) 483 #define CP210X_SERIAL_ERROR_CHAR BIT(2) 484 #define CP210X_SERIAL_NULL_STRIPPING BIT(3) 485 #define CP210X_SERIAL_BREAK_CHAR BIT(4) 486 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6) 487 #define CP210X_SERIAL_RTS_INACTIVE (0 << 6) 488 #define CP210X_SERIAL_RTS_ACTIVE (1 << 6) 489 #define CP210X_SERIAL_RTS_FLOW_CTL (2 << 6) 490 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31) 491 492 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */ 493 struct cp210x_pin_mode { 494 u8 eci; 495 u8 sci; 496 }; 497 498 #define CP210X_PIN_MODE_MODEM 0 499 #define CP210X_PIN_MODE_GPIO BIT(0) 500 501 /* 502 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes 503 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes. 504 */ 505 struct cp210x_dual_port_config { 506 __le16 gpio_mode; 507 u8 __pad0[2]; 508 __le16 reset_state; 509 u8 __pad1[4]; 510 __le16 suspend_state; 511 u8 sci_cfg; 512 u8 eci_cfg; 513 u8 device_cfg; 514 } __packed; 515 516 /* 517 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes 518 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes. 519 */ 520 struct cp210x_single_port_config { 521 __le16 gpio_mode; 522 u8 __pad0[2]; 523 __le16 reset_state; 524 u8 __pad1[4]; 525 __le16 suspend_state; 526 u8 device_cfg; 527 } __packed; 528 529 /* GPIO modes */ 530 #define CP210X_SCI_GPIO_MODE_OFFSET 9 531 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9) 532 533 #define CP210X_ECI_GPIO_MODE_OFFSET 2 534 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2) 535 536 #define CP210X_GPIO_MODE_OFFSET 8 537 #define CP210X_GPIO_MODE_MASK GENMASK(11, 8) 538 539 /* CP2105 port configuration values */ 540 #define CP2105_GPIO0_TXLED_MODE BIT(0) 541 #define CP2105_GPIO1_RXLED_MODE BIT(1) 542 #define CP2105_GPIO1_RS485_MODE BIT(2) 543 544 /* CP2104 port configuration values */ 545 #define CP2104_GPIO0_TXLED_MODE BIT(0) 546 #define CP2104_GPIO1_RXLED_MODE BIT(1) 547 #define CP2104_GPIO2_RS485_MODE BIT(2) 548 549 struct cp210x_quad_port_state { 550 __le16 gpio_mode_pb0; 551 __le16 gpio_mode_pb1; 552 __le16 gpio_mode_pb2; 553 __le16 gpio_mode_pb3; 554 __le16 gpio_mode_pb4; 555 556 __le16 gpio_lowpower_pb0; 557 __le16 gpio_lowpower_pb1; 558 __le16 gpio_lowpower_pb2; 559 __le16 gpio_lowpower_pb3; 560 __le16 gpio_lowpower_pb4; 561 562 __le16 gpio_latch_pb0; 563 __le16 gpio_latch_pb1; 564 __le16 gpio_latch_pb2; 565 __le16 gpio_latch_pb3; 566 __le16 gpio_latch_pb4; 567 }; 568 569 /* 570 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0x49 bytes 571 * on a CP2108 chip. 572 * 573 * See https://www.silabs.com/documents/public/application-notes/an978-cp210x-usb-to-uart-api-specification.pdf 574 */ 575 struct cp210x_quad_port_config { 576 struct cp210x_quad_port_state reset_state; 577 struct cp210x_quad_port_state suspend_state; 578 u8 ipdelay_ifc[4]; 579 u8 enhancedfxn_ifc[4]; 580 u8 enhancedfxn_device; 581 u8 extclkfreq[4]; 582 } __packed; 583 584 #define CP2108_EF_IFC_GPIO_TXLED 0x01 585 #define CP2108_EF_IFC_GPIO_RXLED 0x02 586 #define CP2108_EF_IFC_GPIO_RS485 0x04 587 #define CP2108_EF_IFC_GPIO_RS485_LOGIC 0x08 588 #define CP2108_EF_IFC_GPIO_CLOCK 0x10 589 #define CP2108_EF_IFC_DYNAMIC_SUSPEND 0x40 590 591 /* CP2102N configuration array indices */ 592 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2 593 #define CP210X_2NCONFIG_GPIO_MODE_IDX 581 594 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587 595 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600 596 597 /* CP2102N QFN20 port configuration values */ 598 #define CP2102N_QFN20_GPIO2_TXLED_MODE BIT(2) 599 #define CP2102N_QFN20_GPIO3_RXLED_MODE BIT(3) 600 #define CP2102N_QFN20_GPIO1_RS485_MODE BIT(4) 601 #define CP2102N_QFN20_GPIO0_CLK_MODE BIT(6) 602 603 /* 604 * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x02 bytes 605 * for CP2102N, CP2103, CP2104 and CP2105. 606 */ 607 struct cp210x_gpio_write { 608 u8 mask; 609 u8 state; 610 }; 611 612 /* 613 * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x04 bytes 614 * for CP2108. 615 */ 616 struct cp210x_gpio_write16 { 617 __le16 mask; 618 __le16 state; 619 }; 620 621 /* 622 * Helper to get interface number when we only have struct usb_serial. 623 */ 624 static u8 cp210x_interface_num(struct usb_serial *serial) 625 { 626 struct usb_host_interface *cur_altsetting; 627 628 cur_altsetting = serial->interface->cur_altsetting; 629 630 return cur_altsetting->desc.bInterfaceNumber; 631 } 632 633 /* 634 * Reads a variable-sized block of CP210X_ registers, identified by req. 635 * Returns data into buf in native USB byte order. 636 */ 637 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, 638 void *buf, int bufsize) 639 { 640 struct usb_serial *serial = port->serial; 641 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 642 int result; 643 644 645 result = usb_control_msg_recv(serial->dev, 0, req, 646 REQTYPE_INTERFACE_TO_HOST, 0, 647 port_priv->bInterfaceNumber, buf, bufsize, 648 USB_CTRL_SET_TIMEOUT, GFP_KERNEL); 649 if (result) { 650 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", 651 req, bufsize, result); 652 return result; 653 } 654 655 return 0; 656 } 657 658 /* 659 * Reads any 8-bit CP210X_ register identified by req. 660 */ 661 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val) 662 { 663 return cp210x_read_reg_block(port, req, val, sizeof(*val)); 664 } 665 666 /* 667 * Reads a variable-sized vendor block of CP210X_ registers, identified by val. 668 * Returns data into buf in native USB byte order. 669 */ 670 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val, 671 void *buf, int bufsize) 672 { 673 int result; 674 675 result = usb_control_msg_recv(serial->dev, 0, CP210X_VENDOR_SPECIFIC, 676 type, val, cp210x_interface_num(serial), buf, bufsize, 677 USB_CTRL_GET_TIMEOUT, GFP_KERNEL); 678 if (result) { 679 dev_err(&serial->interface->dev, 680 "failed to get vendor val 0x%04x size %d: %d\n", val, 681 bufsize, result); 682 return result; 683 } 684 685 return 0; 686 } 687 688 /* 689 * Writes any 16-bit CP210X_ register (req) whose value is passed 690 * entirely in the wValue field of the USB request. 691 */ 692 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) 693 { 694 struct usb_serial *serial = port->serial; 695 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 696 int result; 697 698 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 699 req, REQTYPE_HOST_TO_INTERFACE, val, 700 port_priv->bInterfaceNumber, NULL, 0, 701 USB_CTRL_SET_TIMEOUT); 702 if (result < 0) { 703 dev_err(&port->dev, "failed set request 0x%x status: %d\n", 704 req, result); 705 } 706 707 return result; 708 } 709 710 /* 711 * Writes a variable-sized block of CP210X_ registers, identified by req. 712 * Data in buf must be in native USB byte order. 713 */ 714 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req, 715 void *buf, int bufsize) 716 { 717 struct usb_serial *serial = port->serial; 718 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 719 int result; 720 721 result = usb_control_msg_send(serial->dev, 0, req, 722 REQTYPE_HOST_TO_INTERFACE, 0, 723 port_priv->bInterfaceNumber, buf, bufsize, 724 USB_CTRL_SET_TIMEOUT, GFP_KERNEL); 725 if (result) { 726 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", 727 req, bufsize, result); 728 return result; 729 } 730 731 return 0; 732 } 733 734 /* 735 * Writes any 32-bit CP210X_ register identified by req. 736 */ 737 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) 738 { 739 __le32 le32_val; 740 741 le32_val = cpu_to_le32(val); 742 743 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); 744 } 745 746 #ifdef CONFIG_GPIOLIB 747 /* 748 * Writes a variable-sized vendor block of CP210X_ registers, identified by val. 749 * Data in buf must be in native USB byte order. 750 */ 751 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type, 752 u16 val, void *buf, int bufsize) 753 { 754 int result; 755 756 result = usb_control_msg_send(serial->dev, 0, CP210X_VENDOR_SPECIFIC, 757 type, val, cp210x_interface_num(serial), buf, bufsize, 758 USB_CTRL_SET_TIMEOUT, GFP_KERNEL); 759 if (result) { 760 dev_err(&serial->interface->dev, 761 "failed to set vendor val 0x%04x size %d: %d\n", val, 762 bufsize, result); 763 return result; 764 } 765 766 return 0; 767 } 768 #endif 769 770 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 771 { 772 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 773 int result; 774 775 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 776 if (result) { 777 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 778 return result; 779 } 780 781 if (tty) 782 cp210x_set_termios(tty, port, NULL); 783 784 result = usb_serial_generic_open(tty, port); 785 if (result) 786 goto err_disable; 787 788 return 0; 789 790 err_disable: 791 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 792 port_priv->event_mode = false; 793 794 return result; 795 } 796 797 static void cp210x_close(struct usb_serial_port *port) 798 { 799 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 800 801 usb_serial_generic_close(port); 802 803 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 804 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 805 806 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 807 808 /* Disabling the interface disables event-insertion mode. */ 809 port_priv->event_mode = false; 810 } 811 812 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag) 813 { 814 if (lsr & CP210X_LSR_BREAK) { 815 port->icount.brk++; 816 *flag = TTY_BREAK; 817 } else if (lsr & CP210X_LSR_PARITY) { 818 port->icount.parity++; 819 *flag = TTY_PARITY; 820 } else if (lsr & CP210X_LSR_FRAME) { 821 port->icount.frame++; 822 *flag = TTY_FRAME; 823 } 824 825 if (lsr & CP210X_LSR_OVERRUN) { 826 port->icount.overrun++; 827 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); 828 } 829 } 830 831 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag) 832 { 833 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 834 835 switch (port_priv->event_state) { 836 case ES_DATA: 837 if (*ch == CP210X_ESCCHAR) { 838 port_priv->event_state = ES_ESCAPE; 839 break; 840 } 841 return false; 842 case ES_ESCAPE: 843 switch (*ch) { 844 case 0: 845 dev_dbg(&port->dev, "%s - escape char\n", __func__); 846 *ch = CP210X_ESCCHAR; 847 port_priv->event_state = ES_DATA; 848 return false; 849 case 1: 850 port_priv->event_state = ES_LSR_DATA_0; 851 break; 852 case 2: 853 port_priv->event_state = ES_LSR; 854 break; 855 case 3: 856 port_priv->event_state = ES_MSR; 857 break; 858 default: 859 dev_err(&port->dev, "malformed event 0x%02x\n", *ch); 860 port_priv->event_state = ES_DATA; 861 break; 862 } 863 break; 864 case ES_LSR_DATA_0: 865 port_priv->lsr = *ch; 866 port_priv->event_state = ES_LSR_DATA_1; 867 break; 868 case ES_LSR_DATA_1: 869 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n", 870 __func__, port_priv->lsr, *ch); 871 cp210x_process_lsr(port, port_priv->lsr, flag); 872 port_priv->event_state = ES_DATA; 873 return false; 874 case ES_LSR: 875 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch); 876 port_priv->lsr = *ch; 877 cp210x_process_lsr(port, port_priv->lsr, flag); 878 port_priv->event_state = ES_DATA; 879 break; 880 case ES_MSR: 881 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch); 882 /* unimplemented */ 883 port_priv->event_state = ES_DATA; 884 break; 885 } 886 887 return true; 888 } 889 890 static void cp210x_process_read_urb(struct urb *urb) 891 { 892 struct usb_serial_port *port = urb->context; 893 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 894 unsigned char *ch = urb->transfer_buffer; 895 char flag; 896 int i; 897 898 if (!urb->actual_length) 899 return; 900 901 if (port_priv->event_mode) { 902 for (i = 0; i < urb->actual_length; i++, ch++) { 903 flag = TTY_NORMAL; 904 905 if (cp210x_process_char(port, ch, &flag)) 906 continue; 907 908 tty_insert_flip_char(&port->port, *ch, flag); 909 } 910 } else { 911 tty_insert_flip_string(&port->port, ch, urb->actual_length); 912 } 913 tty_flip_buffer_push(&port->port); 914 } 915 916 /* 917 * Read how many bytes are waiting in the TX queue. 918 */ 919 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 920 u32 *count) 921 { 922 struct usb_serial *serial = port->serial; 923 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 924 struct cp210x_comm_status sts; 925 int result; 926 927 result = usb_control_msg_recv(serial->dev, 0, CP210X_GET_COMM_STATUS, 928 REQTYPE_INTERFACE_TO_HOST, 0, 929 port_priv->bInterfaceNumber, &sts, sizeof(sts), 930 USB_CTRL_GET_TIMEOUT, GFP_KERNEL); 931 if (result) { 932 dev_err(&port->dev, "failed to get comm status: %d\n", result); 933 return result; 934 } 935 936 *count = le32_to_cpu(sts.ulAmountInOutQueue); 937 938 return 0; 939 } 940 941 static bool cp210x_tx_empty(struct usb_serial_port *port) 942 { 943 int err; 944 u32 count; 945 946 err = cp210x_get_tx_queue_byte_count(port, &count); 947 if (err) 948 return true; 949 950 return !count; 951 } 952 953 struct cp210x_rate { 954 speed_t rate; 955 speed_t high; 956 }; 957 958 static const struct cp210x_rate cp210x_an205_table1[] = { 959 { 300, 300 }, 960 { 600, 600 }, 961 { 1200, 1200 }, 962 { 1800, 1800 }, 963 { 2400, 2400 }, 964 { 4000, 4000 }, 965 { 4800, 4803 }, 966 { 7200, 7207 }, 967 { 9600, 9612 }, 968 { 14400, 14428 }, 969 { 16000, 16062 }, 970 { 19200, 19250 }, 971 { 28800, 28912 }, 972 { 38400, 38601 }, 973 { 51200, 51558 }, 974 { 56000, 56280 }, 975 { 57600, 58053 }, 976 { 64000, 64111 }, 977 { 76800, 77608 }, 978 { 115200, 117028 }, 979 { 128000, 129347 }, 980 { 153600, 156868 }, 981 { 230400, 237832 }, 982 { 250000, 254234 }, 983 { 256000, 273066 }, 984 { 460800, 491520 }, 985 { 500000, 567138 }, 986 { 576000, 670254 }, 987 { 921600, UINT_MAX } 988 }; 989 990 /* 991 * Quantises the baud rate as per AN205 Table 1 992 */ 993 static speed_t cp210x_get_an205_rate(speed_t baud) 994 { 995 int i; 996 997 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) { 998 if (baud <= cp210x_an205_table1[i].high) 999 break; 1000 } 1001 1002 return cp210x_an205_table1[i].rate; 1003 } 1004 1005 static speed_t cp210x_get_actual_rate(speed_t baud) 1006 { 1007 unsigned int prescale = 1; 1008 unsigned int div; 1009 1010 if (baud <= 365) 1011 prescale = 4; 1012 1013 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud); 1014 baud = 48000000 / (2 * prescale * div); 1015 1016 return baud; 1017 } 1018 1019 /* 1020 * CP2101 supports the following baud rates: 1021 * 1022 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 1023 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 1024 * 1025 * CP2102 and CP2103 support the following additional rates: 1026 * 1027 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 1028 * 576000 1029 * 1030 * The device will map a requested rate to a supported one, but the result 1031 * of requests for rates greater than 1053257 is undefined (see AN205). 1032 * 1033 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 1034 * respectively, with an error less than 1%. The actual rates are determined 1035 * by 1036 * 1037 * div = round(freq / (2 x prescale x request)) 1038 * actual = freq / (2 x prescale x div) 1039 * 1040 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 1041 * or 1 otherwise. 1042 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 1043 * otherwise. 1044 */ 1045 static void cp210x_change_speed(struct tty_struct *tty, 1046 struct usb_serial_port *port, 1047 const struct ktermios *old_termios) 1048 { 1049 struct usb_serial *serial = port->serial; 1050 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1051 u32 baud; 1052 1053 if (tty->termios.c_ospeed == 0) 1054 return; 1055 1056 /* 1057 * This maps the requested rate to the actual rate, a valid rate on 1058 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed]. 1059 */ 1060 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed); 1061 1062 if (priv->use_actual_rate) 1063 baud = cp210x_get_actual_rate(baud); 1064 else if (baud < 1000000) 1065 baud = cp210x_get_an205_rate(baud); 1066 1067 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 1068 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { 1069 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 1070 if (old_termios) 1071 baud = old_termios->c_ospeed; 1072 else 1073 baud = 9600; 1074 } 1075 1076 tty_encode_baud_rate(tty, baud, baud); 1077 } 1078 1079 static void cp210x_enable_event_mode(struct usb_serial_port *port) 1080 { 1081 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1082 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1083 int ret; 1084 1085 if (port_priv->event_mode) 1086 return; 1087 1088 if (priv->no_event_mode) 1089 return; 1090 1091 port_priv->event_state = ES_DATA; 1092 port_priv->event_mode = true; 1093 1094 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR); 1095 if (ret) { 1096 dev_err(&port->dev, "failed to enable events: %d\n", ret); 1097 port_priv->event_mode = false; 1098 } 1099 } 1100 1101 static void cp210x_disable_event_mode(struct usb_serial_port *port) 1102 { 1103 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1104 int ret; 1105 1106 if (!port_priv->event_mode) 1107 return; 1108 1109 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0); 1110 if (ret) { 1111 dev_err(&port->dev, "failed to disable events: %d\n", ret); 1112 return; 1113 } 1114 1115 port_priv->event_mode = false; 1116 } 1117 1118 static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b) 1119 { 1120 bool iflag_change, cc_change; 1121 1122 iflag_change = ((a->c_iflag ^ b->c_iflag) & (INPCK | IXON | IXOFF)); 1123 cc_change = a->c_cc[VSTART] != b->c_cc[VSTART] || 1124 a->c_cc[VSTOP] != b->c_cc[VSTOP]; 1125 1126 return tty_termios_hw_change(a, b) || iflag_change || cc_change; 1127 } 1128 1129 static void cp210x_set_flow_control(struct tty_struct *tty, 1130 struct usb_serial_port *port, 1131 const struct ktermios *old_termios) 1132 { 1133 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1134 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1135 struct cp210x_special_chars chars; 1136 struct cp210x_flow_ctl flow_ctl; 1137 u32 flow_repl; 1138 u32 ctl_hs; 1139 bool crtscts; 1140 int ret; 1141 1142 /* 1143 * Some CP2102N interpret ulXonLimit as ulFlowReplace (erratum 1144 * CP2102N_E104). Report back that flow control is not supported. 1145 */ 1146 if (priv->no_flow_control) { 1147 tty->termios.c_cflag &= ~CRTSCTS; 1148 tty->termios.c_iflag &= ~(IXON | IXOFF); 1149 } 1150 1151 if (tty->termios.c_ospeed != 0 && 1152 old_termios && old_termios->c_ospeed != 0 && 1153 C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) && 1154 I_IXON(tty) == (old_termios->c_iflag & IXON) && 1155 I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) && 1156 START_CHAR(tty) == old_termios->c_cc[VSTART] && 1157 STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) { 1158 return; 1159 } 1160 1161 if (I_IXON(tty) || I_IXOFF(tty)) { 1162 memset(&chars, 0, sizeof(chars)); 1163 1164 chars.bXonChar = START_CHAR(tty); 1165 chars.bXoffChar = STOP_CHAR(tty); 1166 1167 ret = cp210x_write_reg_block(port, CP210X_SET_CHARS, &chars, 1168 sizeof(chars)); 1169 if (ret) { 1170 dev_err(&port->dev, "failed to set special chars: %d\n", 1171 ret); 1172 } 1173 } 1174 1175 mutex_lock(&port_priv->mutex); 1176 1177 if (tty->termios.c_ospeed == 0) { 1178 port_priv->dtr = false; 1179 port_priv->rts = false; 1180 } else if (old_termios && old_termios->c_ospeed == 0) { 1181 port_priv->dtr = true; 1182 port_priv->rts = true; 1183 } 1184 1185 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1186 sizeof(flow_ctl)); 1187 if (ret) 1188 goto out_unlock; 1189 1190 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1191 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1192 1193 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE; 1194 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE; 1195 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY; 1196 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1197 if (port_priv->dtr) 1198 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE; 1199 else 1200 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE; 1201 1202 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1203 if (C_CRTSCTS(tty)) { 1204 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE; 1205 if (port_priv->rts) 1206 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL; 1207 else 1208 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1209 crtscts = true; 1210 } else { 1211 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE; 1212 if (port_priv->rts) 1213 flow_repl |= CP210X_SERIAL_RTS_ACTIVE; 1214 else 1215 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1216 crtscts = false; 1217 } 1218 1219 if (I_IXOFF(tty)) { 1220 flow_repl |= CP210X_SERIAL_AUTO_RECEIVE; 1221 1222 flow_ctl.ulXonLimit = cpu_to_le32(128); 1223 flow_ctl.ulXoffLimit = cpu_to_le32(128); 1224 } else { 1225 flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE; 1226 } 1227 1228 if (I_IXON(tty)) 1229 flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT; 1230 else 1231 flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT; 1232 1233 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__, 1234 ctl_hs, flow_repl); 1235 1236 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1237 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1238 1239 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1240 sizeof(flow_ctl)); 1241 if (ret) 1242 goto out_unlock; 1243 1244 port_priv->crtscts = crtscts; 1245 out_unlock: 1246 mutex_unlock(&port_priv->mutex); 1247 } 1248 1249 static void cp210x_set_termios(struct tty_struct *tty, 1250 struct usb_serial_port *port, 1251 const struct ktermios *old_termios) 1252 { 1253 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1254 u16 bits; 1255 int ret; 1256 1257 if (old_termios && !cp210x_termios_change(&tty->termios, old_termios) && 1258 tty->termios.c_ospeed != 0) 1259 return; 1260 1261 if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed) 1262 cp210x_change_speed(tty, port, old_termios); 1263 1264 /* CP2101 only supports CS8, 1 stop bit and non-stick parity. */ 1265 if (priv->partnum == CP210X_PARTNUM_CP2101) { 1266 tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR); 1267 tty->termios.c_cflag |= CS8; 1268 } 1269 1270 bits = 0; 1271 1272 switch (C_CSIZE(tty)) { 1273 case CS5: 1274 bits |= BITS_DATA_5; 1275 break; 1276 case CS6: 1277 bits |= BITS_DATA_6; 1278 break; 1279 case CS7: 1280 bits |= BITS_DATA_7; 1281 break; 1282 case CS8: 1283 default: 1284 bits |= BITS_DATA_8; 1285 break; 1286 } 1287 1288 if (C_PARENB(tty)) { 1289 if (C_CMSPAR(tty)) { 1290 if (C_PARODD(tty)) 1291 bits |= BITS_PARITY_MARK; 1292 else 1293 bits |= BITS_PARITY_SPACE; 1294 } else { 1295 if (C_PARODD(tty)) 1296 bits |= BITS_PARITY_ODD; 1297 else 1298 bits |= BITS_PARITY_EVEN; 1299 } 1300 } 1301 1302 if (C_CSTOPB(tty)) 1303 bits |= BITS_STOP_2; 1304 else 1305 bits |= BITS_STOP_1; 1306 1307 ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1308 if (ret) 1309 dev_err(&port->dev, "failed to set line control: %d\n", ret); 1310 1311 cp210x_set_flow_control(tty, port, old_termios); 1312 1313 /* 1314 * Enable event-insertion mode only if input parity checking is 1315 * enabled for now. 1316 */ 1317 if (I_INPCK(tty)) 1318 cp210x_enable_event_mode(port); 1319 else 1320 cp210x_disable_event_mode(port); 1321 } 1322 1323 static int cp210x_tiocmset(struct tty_struct *tty, 1324 unsigned int set, unsigned int clear) 1325 { 1326 struct usb_serial_port *port = tty->driver_data; 1327 return cp210x_tiocmset_port(port, set, clear); 1328 } 1329 1330 static int cp210x_tiocmset_port(struct usb_serial_port *port, 1331 unsigned int set, unsigned int clear) 1332 { 1333 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1334 struct cp210x_flow_ctl flow_ctl; 1335 u32 ctl_hs, flow_repl; 1336 u16 control = 0; 1337 int ret; 1338 1339 mutex_lock(&port_priv->mutex); 1340 1341 if (set & TIOCM_RTS) { 1342 port_priv->rts = true; 1343 control |= CONTROL_RTS; 1344 control |= CONTROL_WRITE_RTS; 1345 } 1346 if (set & TIOCM_DTR) { 1347 port_priv->dtr = true; 1348 control |= CONTROL_DTR; 1349 control |= CONTROL_WRITE_DTR; 1350 } 1351 if (clear & TIOCM_RTS) { 1352 port_priv->rts = false; 1353 control &= ~CONTROL_RTS; 1354 control |= CONTROL_WRITE_RTS; 1355 } 1356 if (clear & TIOCM_DTR) { 1357 port_priv->dtr = false; 1358 control &= ~CONTROL_DTR; 1359 control |= CONTROL_WRITE_DTR; 1360 } 1361 1362 /* 1363 * Use SET_FLOW to set DTR and enable/disable auto-RTS when hardware 1364 * flow control is enabled. 1365 */ 1366 if (port_priv->crtscts && control & CONTROL_WRITE_RTS) { 1367 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1368 sizeof(flow_ctl)); 1369 if (ret) 1370 goto out_unlock; 1371 1372 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1373 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1374 1375 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1376 if (port_priv->dtr) 1377 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE; 1378 else 1379 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE; 1380 1381 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1382 if (port_priv->rts) 1383 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL; 1384 else 1385 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1386 1387 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1388 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1389 1390 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", 1391 __func__, ctl_hs, flow_repl); 1392 1393 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1394 sizeof(flow_ctl)); 1395 } else { 1396 dev_dbg(&port->dev, "%s - control = 0x%04x\n", __func__, control); 1397 1398 ret = cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1399 } 1400 out_unlock: 1401 mutex_unlock(&port_priv->mutex); 1402 1403 return ret; 1404 } 1405 1406 static void cp210x_dtr_rts(struct usb_serial_port *port, int on) 1407 { 1408 if (on) 1409 cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0); 1410 else 1411 cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS); 1412 } 1413 1414 static int cp210x_tiocmget(struct tty_struct *tty) 1415 { 1416 struct usb_serial_port *port = tty->driver_data; 1417 u8 control; 1418 int result; 1419 1420 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1421 if (result) 1422 return result; 1423 1424 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1425 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1426 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1427 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1428 |((control & CONTROL_RING)? TIOCM_RI : 0) 1429 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1430 1431 dev_dbg(&port->dev, "%s - control = 0x%02x\n", __func__, control); 1432 1433 return result; 1434 } 1435 1436 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 1437 { 1438 struct usb_serial_port *port = tty->driver_data; 1439 u16 state; 1440 1441 if (break_state == 0) 1442 state = BREAK_OFF; 1443 else 1444 state = BREAK_ON; 1445 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1446 state == BREAK_OFF ? "off" : "on"); 1447 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1448 } 1449 1450 #ifdef CONFIG_GPIOLIB 1451 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio) 1452 { 1453 struct usb_serial *serial = gpiochip_get_data(gc); 1454 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1455 u8 req_type; 1456 u16 mask; 1457 int result; 1458 int len; 1459 1460 result = usb_autopm_get_interface(serial->interface); 1461 if (result) 1462 return result; 1463 1464 switch (priv->partnum) { 1465 case CP210X_PARTNUM_CP2105: 1466 req_type = REQTYPE_INTERFACE_TO_HOST; 1467 len = 1; 1468 break; 1469 case CP210X_PARTNUM_CP2108: 1470 req_type = REQTYPE_INTERFACE_TO_HOST; 1471 len = 2; 1472 break; 1473 default: 1474 req_type = REQTYPE_DEVICE_TO_HOST; 1475 len = 1; 1476 break; 1477 } 1478 1479 mask = 0; 1480 result = cp210x_read_vendor_block(serial, req_type, CP210X_READ_LATCH, 1481 &mask, len); 1482 1483 usb_autopm_put_interface(serial->interface); 1484 1485 if (result < 0) 1486 return result; 1487 1488 le16_to_cpus(&mask); 1489 1490 return !!(mask & BIT(gpio)); 1491 } 1492 1493 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value) 1494 { 1495 struct usb_serial *serial = gpiochip_get_data(gc); 1496 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1497 struct cp210x_gpio_write16 buf16; 1498 struct cp210x_gpio_write buf; 1499 u16 mask, state; 1500 u16 wIndex; 1501 int result; 1502 1503 if (value == 1) 1504 state = BIT(gpio); 1505 else 1506 state = 0; 1507 1508 mask = BIT(gpio); 1509 1510 result = usb_autopm_get_interface(serial->interface); 1511 if (result) 1512 goto out; 1513 1514 switch (priv->partnum) { 1515 case CP210X_PARTNUM_CP2105: 1516 buf.mask = (u8)mask; 1517 buf.state = (u8)state; 1518 result = cp210x_write_vendor_block(serial, 1519 REQTYPE_HOST_TO_INTERFACE, 1520 CP210X_WRITE_LATCH, &buf, 1521 sizeof(buf)); 1522 break; 1523 case CP210X_PARTNUM_CP2108: 1524 buf16.mask = cpu_to_le16(mask); 1525 buf16.state = cpu_to_le16(state); 1526 result = cp210x_write_vendor_block(serial, 1527 REQTYPE_HOST_TO_INTERFACE, 1528 CP210X_WRITE_LATCH, &buf16, 1529 sizeof(buf16)); 1530 break; 1531 default: 1532 wIndex = state << 8 | mask; 1533 result = usb_control_msg(serial->dev, 1534 usb_sndctrlpipe(serial->dev, 0), 1535 CP210X_VENDOR_SPECIFIC, 1536 REQTYPE_HOST_TO_DEVICE, 1537 CP210X_WRITE_LATCH, 1538 wIndex, 1539 NULL, 0, USB_CTRL_SET_TIMEOUT); 1540 break; 1541 } 1542 1543 usb_autopm_put_interface(serial->interface); 1544 out: 1545 if (result < 0) { 1546 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n", 1547 result); 1548 } 1549 } 1550 1551 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio) 1552 { 1553 struct usb_serial *serial = gpiochip_get_data(gc); 1554 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1555 1556 return priv->gpio_input & BIT(gpio); 1557 } 1558 1559 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio) 1560 { 1561 struct usb_serial *serial = gpiochip_get_data(gc); 1562 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1563 1564 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1565 /* hardware does not support an input mode */ 1566 return -ENOTSUPP; 1567 } 1568 1569 /* push-pull pins cannot be changed to be inputs */ 1570 if (priv->gpio_pushpull & BIT(gpio)) 1571 return -EINVAL; 1572 1573 /* make sure to release pin if it is being driven low */ 1574 cp210x_gpio_set(gc, gpio, 1); 1575 1576 priv->gpio_input |= BIT(gpio); 1577 1578 return 0; 1579 } 1580 1581 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio, 1582 int value) 1583 { 1584 struct usb_serial *serial = gpiochip_get_data(gc); 1585 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1586 1587 priv->gpio_input &= ~BIT(gpio); 1588 cp210x_gpio_set(gc, gpio, value); 1589 1590 return 0; 1591 } 1592 1593 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio, 1594 unsigned long config) 1595 { 1596 struct usb_serial *serial = gpiochip_get_data(gc); 1597 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1598 enum pin_config_param param = pinconf_to_config_param(config); 1599 1600 /* Succeed only if in correct mode (this can't be set at runtime) */ 1601 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) && 1602 (priv->gpio_pushpull & BIT(gpio))) 1603 return 0; 1604 1605 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) && 1606 !(priv->gpio_pushpull & BIT(gpio))) 1607 return 0; 1608 1609 return -ENOTSUPP; 1610 } 1611 1612 static int cp210x_gpio_init_valid_mask(struct gpio_chip *gc, 1613 unsigned long *valid_mask, unsigned int ngpios) 1614 { 1615 struct usb_serial *serial = gpiochip_get_data(gc); 1616 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1617 struct device *dev = &serial->interface->dev; 1618 unsigned long altfunc_mask = priv->gpio_altfunc; 1619 1620 bitmap_complement(valid_mask, &altfunc_mask, ngpios); 1621 1622 if (bitmap_empty(valid_mask, ngpios)) 1623 dev_dbg(dev, "no pin configured for GPIO\n"); 1624 else 1625 dev_dbg(dev, "GPIO.%*pbl configured for GPIO\n", ngpios, 1626 valid_mask); 1627 return 0; 1628 } 1629 1630 /* 1631 * This function is for configuring GPIO using shared pins, where other signals 1632 * are made unavailable by configuring the use of GPIO. This is believed to be 1633 * only applicable to the cp2105 at this point, the other devices supported by 1634 * this driver that provide GPIO do so in a way that does not impact other 1635 * signals and are thus expected to have very different initialisation. 1636 */ 1637 static int cp2105_gpioconf_init(struct usb_serial *serial) 1638 { 1639 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1640 struct cp210x_pin_mode mode; 1641 struct cp210x_dual_port_config config; 1642 u8 intf_num = cp210x_interface_num(serial); 1643 u8 iface_config; 1644 int result; 1645 1646 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1647 CP210X_GET_DEVICEMODE, &mode, 1648 sizeof(mode)); 1649 if (result < 0) 1650 return result; 1651 1652 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1653 CP210X_GET_PORTCONFIG, &config, 1654 sizeof(config)); 1655 if (result < 0) 1656 return result; 1657 1658 /* 2 banks of GPIO - One for the pins taken from each serial port */ 1659 if (intf_num == 0) { 1660 priv->gc.ngpio = 2; 1661 1662 if (mode.eci == CP210X_PIN_MODE_MODEM) { 1663 /* mark all GPIOs of this interface as reserved */ 1664 priv->gpio_altfunc = 0xff; 1665 return 0; 1666 } 1667 1668 iface_config = config.eci_cfg; 1669 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1670 CP210X_ECI_GPIO_MODE_MASK) >> 1671 CP210X_ECI_GPIO_MODE_OFFSET); 1672 } else if (intf_num == 1) { 1673 priv->gc.ngpio = 3; 1674 1675 if (mode.sci == CP210X_PIN_MODE_MODEM) { 1676 /* mark all GPIOs of this interface as reserved */ 1677 priv->gpio_altfunc = 0xff; 1678 return 0; 1679 } 1680 1681 iface_config = config.sci_cfg; 1682 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1683 CP210X_SCI_GPIO_MODE_MASK) >> 1684 CP210X_SCI_GPIO_MODE_OFFSET); 1685 } else { 1686 return -ENODEV; 1687 } 1688 1689 /* mark all pins which are not in GPIO mode */ 1690 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */ 1691 priv->gpio_altfunc |= BIT(0); 1692 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */ 1693 CP2105_GPIO1_RS485_MODE)) 1694 priv->gpio_altfunc |= BIT(1); 1695 1696 /* driver implementation for CP2105 only supports outputs */ 1697 priv->gpio_input = 0; 1698 1699 return 0; 1700 } 1701 1702 static int cp2104_gpioconf_init(struct usb_serial *serial) 1703 { 1704 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1705 struct cp210x_single_port_config config; 1706 u8 iface_config; 1707 u8 gpio_latch; 1708 int result; 1709 u8 i; 1710 1711 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1712 CP210X_GET_PORTCONFIG, &config, 1713 sizeof(config)); 1714 if (result < 0) 1715 return result; 1716 1717 priv->gc.ngpio = 4; 1718 1719 iface_config = config.device_cfg; 1720 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1721 CP210X_GPIO_MODE_MASK) >> 1722 CP210X_GPIO_MODE_OFFSET); 1723 gpio_latch = (u8)((le16_to_cpu(config.reset_state) & 1724 CP210X_GPIO_MODE_MASK) >> 1725 CP210X_GPIO_MODE_OFFSET); 1726 1727 /* mark all pins which are not in GPIO mode */ 1728 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */ 1729 priv->gpio_altfunc |= BIT(0); 1730 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */ 1731 priv->gpio_altfunc |= BIT(1); 1732 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */ 1733 priv->gpio_altfunc |= BIT(2); 1734 1735 /* 1736 * Like CP2102N, CP2104 has also no strict input and output pin 1737 * modes. 1738 * Do the same input mode emulation as CP2102N. 1739 */ 1740 for (i = 0; i < priv->gc.ngpio; ++i) { 1741 /* 1742 * Set direction to "input" iff pin is open-drain and reset 1743 * value is 1. 1744 */ 1745 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1746 priv->gpio_input |= BIT(i); 1747 } 1748 1749 return 0; 1750 } 1751 1752 static int cp2108_gpio_init(struct usb_serial *serial) 1753 { 1754 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1755 struct cp210x_quad_port_config config; 1756 u16 gpio_latch; 1757 int result; 1758 u8 i; 1759 1760 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1761 CP210X_GET_PORTCONFIG, &config, 1762 sizeof(config)); 1763 if (result < 0) 1764 return result; 1765 1766 priv->gc.ngpio = 16; 1767 priv->gpio_pushpull = le16_to_cpu(config.reset_state.gpio_mode_pb1); 1768 gpio_latch = le16_to_cpu(config.reset_state.gpio_latch_pb1); 1769 1770 /* 1771 * Mark all pins which are not in GPIO mode. 1772 * 1773 * Refer to table 9.1 "GPIO Mode alternate Functions" in the datasheet: 1774 * https://www.silabs.com/documents/public/data-sheets/cp2108-datasheet.pdf 1775 * 1776 * Alternate functions of GPIO0 to GPIO3 are determine by enhancedfxn_ifc[0] 1777 * and the similarly for the other pins; enhancedfxn_ifc[1]: GPIO4 to GPIO7, 1778 * enhancedfxn_ifc[2]: GPIO8 to GPIO11, enhancedfxn_ifc[3]: GPIO12 to GPIO15. 1779 */ 1780 for (i = 0; i < 4; i++) { 1781 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_TXLED) 1782 priv->gpio_altfunc |= BIT(i * 4); 1783 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RXLED) 1784 priv->gpio_altfunc |= BIT((i * 4) + 1); 1785 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RS485) 1786 priv->gpio_altfunc |= BIT((i * 4) + 2); 1787 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_CLOCK) 1788 priv->gpio_altfunc |= BIT((i * 4) + 3); 1789 } 1790 1791 /* 1792 * Like CP2102N, CP2108 has also no strict input and output pin 1793 * modes. Do the same input mode emulation as CP2102N. 1794 */ 1795 for (i = 0; i < priv->gc.ngpio; ++i) { 1796 /* 1797 * Set direction to "input" iff pin is open-drain and reset 1798 * value is 1. 1799 */ 1800 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1801 priv->gpio_input |= BIT(i); 1802 } 1803 1804 return 0; 1805 } 1806 1807 static int cp2102n_gpioconf_init(struct usb_serial *serial) 1808 { 1809 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1810 const u16 config_size = 0x02a6; 1811 u8 gpio_rst_latch; 1812 u8 config_version; 1813 u8 gpio_pushpull; 1814 u8 *config_buf; 1815 u8 gpio_latch; 1816 u8 gpio_ctrl; 1817 int result; 1818 u8 i; 1819 1820 /* 1821 * Retrieve device configuration from the device. 1822 * The array received contains all customization settings done at the 1823 * factory/manufacturer. Format of the array is documented at the 1824 * time of writing at: 1825 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa 1826 */ 1827 config_buf = kmalloc(config_size, GFP_KERNEL); 1828 if (!config_buf) 1829 return -ENOMEM; 1830 1831 result = cp210x_read_vendor_block(serial, 1832 REQTYPE_DEVICE_TO_HOST, 1833 CP210X_READ_2NCONFIG, 1834 config_buf, 1835 config_size); 1836 if (result < 0) { 1837 kfree(config_buf); 1838 return result; 1839 } 1840 1841 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX]; 1842 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX]; 1843 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX]; 1844 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX]; 1845 1846 kfree(config_buf); 1847 1848 /* Make sure this is a config format we understand. */ 1849 if (config_version != 0x01) 1850 return -ENOTSUPP; 1851 1852 priv->gc.ngpio = 4; 1853 1854 /* 1855 * Get default pin states after reset. Needed so we can determine 1856 * the direction of an open-drain pin. 1857 */ 1858 gpio_latch = (gpio_rst_latch >> 3) & 0x0f; 1859 1860 /* 0 indicates open-drain mode, 1 is push-pull */ 1861 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f; 1862 1863 /* 0 indicates GPIO mode, 1 is alternate function */ 1864 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) { 1865 /* QFN20 is special... */ 1866 if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE) /* GPIO 0 */ 1867 priv->gpio_altfunc |= BIT(0); 1868 if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */ 1869 priv->gpio_altfunc |= BIT(1); 1870 if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */ 1871 priv->gpio_altfunc |= BIT(2); 1872 if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */ 1873 priv->gpio_altfunc |= BIT(3); 1874 } else { 1875 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f; 1876 } 1877 1878 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) { 1879 /* 1880 * For the QFN28 package, GPIO4-6 are controlled by 1881 * the low three bits of the mode/latch fields. 1882 * Contrary to the document linked above, the bits for 1883 * the SUSPEND pins are elsewhere. No alternate 1884 * function is available for these pins. 1885 */ 1886 priv->gc.ngpio = 7; 1887 gpio_latch |= (gpio_rst_latch & 7) << 4; 1888 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4; 1889 } 1890 1891 /* 1892 * The CP2102N does not strictly has input and output pin modes, 1893 * it only knows open-drain and push-pull modes which is set at 1894 * factory. An open-drain pin can function both as an 1895 * input or an output. We emulate input mode for open-drain pins 1896 * by making sure they are not driven low, and we do not allow 1897 * push-pull pins to be set as an input. 1898 */ 1899 for (i = 0; i < priv->gc.ngpio; ++i) { 1900 /* 1901 * Set direction to "input" iff pin is open-drain and reset 1902 * value is 1. 1903 */ 1904 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1905 priv->gpio_input |= BIT(i); 1906 } 1907 1908 return 0; 1909 } 1910 1911 static int cp210x_gpio_init(struct usb_serial *serial) 1912 { 1913 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1914 int result; 1915 1916 switch (priv->partnum) { 1917 case CP210X_PARTNUM_CP2104: 1918 result = cp2104_gpioconf_init(serial); 1919 break; 1920 case CP210X_PARTNUM_CP2105: 1921 result = cp2105_gpioconf_init(serial); 1922 break; 1923 case CP210X_PARTNUM_CP2108: 1924 /* 1925 * The GPIOs are not tied to any specific port so only register 1926 * once for interface 0. 1927 */ 1928 if (cp210x_interface_num(serial) != 0) 1929 return 0; 1930 result = cp2108_gpio_init(serial); 1931 break; 1932 case CP210X_PARTNUM_CP2102N_QFN28: 1933 case CP210X_PARTNUM_CP2102N_QFN24: 1934 case CP210X_PARTNUM_CP2102N_QFN20: 1935 result = cp2102n_gpioconf_init(serial); 1936 break; 1937 default: 1938 return 0; 1939 } 1940 1941 if (result < 0) 1942 return result; 1943 1944 priv->gc.label = "cp210x"; 1945 priv->gc.get_direction = cp210x_gpio_direction_get; 1946 priv->gc.direction_input = cp210x_gpio_direction_input; 1947 priv->gc.direction_output = cp210x_gpio_direction_output; 1948 priv->gc.get = cp210x_gpio_get; 1949 priv->gc.set = cp210x_gpio_set; 1950 priv->gc.set_config = cp210x_gpio_set_config; 1951 priv->gc.init_valid_mask = cp210x_gpio_init_valid_mask; 1952 priv->gc.owner = THIS_MODULE; 1953 priv->gc.parent = &serial->interface->dev; 1954 priv->gc.base = -1; 1955 priv->gc.can_sleep = true; 1956 1957 result = gpiochip_add_data(&priv->gc, serial); 1958 if (!result) 1959 priv->gpio_registered = true; 1960 1961 return result; 1962 } 1963 1964 static void cp210x_gpio_remove(struct usb_serial *serial) 1965 { 1966 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1967 1968 if (priv->gpio_registered) { 1969 gpiochip_remove(&priv->gc); 1970 priv->gpio_registered = false; 1971 } 1972 } 1973 1974 #else 1975 1976 static int cp210x_gpio_init(struct usb_serial *serial) 1977 { 1978 return 0; 1979 } 1980 1981 static void cp210x_gpio_remove(struct usb_serial *serial) 1982 { 1983 /* Nothing to do */ 1984 } 1985 1986 #endif 1987 1988 static int cp210x_port_probe(struct usb_serial_port *port) 1989 { 1990 struct usb_serial *serial = port->serial; 1991 struct cp210x_port_private *port_priv; 1992 1993 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 1994 if (!port_priv) 1995 return -ENOMEM; 1996 1997 port_priv->bInterfaceNumber = cp210x_interface_num(serial); 1998 mutex_init(&port_priv->mutex); 1999 2000 usb_set_serial_port_data(port, port_priv); 2001 2002 return 0; 2003 } 2004 2005 static void cp210x_port_remove(struct usb_serial_port *port) 2006 { 2007 struct cp210x_port_private *port_priv; 2008 2009 port_priv = usb_get_serial_port_data(port); 2010 kfree(port_priv); 2011 } 2012 2013 static void cp210x_init_max_speed(struct usb_serial *serial) 2014 { 2015 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2016 bool use_actual_rate = false; 2017 speed_t min = 300; 2018 speed_t max; 2019 2020 switch (priv->partnum) { 2021 case CP210X_PARTNUM_CP2101: 2022 max = 921600; 2023 break; 2024 case CP210X_PARTNUM_CP2102: 2025 case CP210X_PARTNUM_CP2103: 2026 max = 1000000; 2027 break; 2028 case CP210X_PARTNUM_CP2104: 2029 use_actual_rate = true; 2030 max = 2000000; 2031 break; 2032 case CP210X_PARTNUM_CP2108: 2033 max = 2000000; 2034 break; 2035 case CP210X_PARTNUM_CP2105: 2036 if (cp210x_interface_num(serial) == 0) { 2037 use_actual_rate = true; 2038 max = 2000000; /* ECI */ 2039 } else { 2040 min = 2400; 2041 max = 921600; /* SCI */ 2042 } 2043 break; 2044 case CP210X_PARTNUM_CP2102N_QFN28: 2045 case CP210X_PARTNUM_CP2102N_QFN24: 2046 case CP210X_PARTNUM_CP2102N_QFN20: 2047 use_actual_rate = true; 2048 max = 3000000; 2049 break; 2050 default: 2051 max = 2000000; 2052 break; 2053 } 2054 2055 priv->min_speed = min; 2056 priv->max_speed = max; 2057 priv->use_actual_rate = use_actual_rate; 2058 } 2059 2060 static void cp2102_determine_quirks(struct usb_serial *serial) 2061 { 2062 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2063 u8 *buf; 2064 int ret; 2065 2066 buf = kmalloc(2, GFP_KERNEL); 2067 if (!buf) 2068 return; 2069 /* 2070 * Some (possibly counterfeit) CP2102 do not support event-insertion 2071 * mode and respond differently to malformed vendor requests. 2072 * Specifically, they return one instead of two bytes when sent a 2073 * two-byte part-number request. 2074 */ 2075 ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 2076 CP210X_VENDOR_SPECIFIC, REQTYPE_DEVICE_TO_HOST, 2077 CP210X_GET_PARTNUM, 0, buf, 2, USB_CTRL_GET_TIMEOUT); 2078 if (ret == 1) { 2079 dev_dbg(&serial->interface->dev, 2080 "device does not support event-insertion mode\n"); 2081 priv->no_event_mode = true; 2082 } 2083 2084 kfree(buf); 2085 } 2086 2087 static int cp210x_get_fw_version(struct usb_serial *serial, u16 value) 2088 { 2089 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2090 u8 ver[3]; 2091 int ret; 2092 2093 ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, value, 2094 ver, sizeof(ver)); 2095 if (ret) 2096 return ret; 2097 2098 dev_dbg(&serial->interface->dev, "%s - %d.%d.%d\n", __func__, 2099 ver[0], ver[1], ver[2]); 2100 2101 priv->fw_version = ver[0] << 16 | ver[1] << 8 | ver[2]; 2102 2103 return 0; 2104 } 2105 2106 static void cp210x_determine_type(struct usb_serial *serial) 2107 { 2108 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2109 int ret; 2110 2111 ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 2112 CP210X_GET_PARTNUM, &priv->partnum, 2113 sizeof(priv->partnum)); 2114 if (ret < 0) { 2115 dev_warn(&serial->interface->dev, 2116 "querying part number failed\n"); 2117 priv->partnum = CP210X_PARTNUM_UNKNOWN; 2118 return; 2119 } 2120 2121 dev_dbg(&serial->interface->dev, "partnum = 0x%02x\n", priv->partnum); 2122 2123 switch (priv->partnum) { 2124 case CP210X_PARTNUM_CP2102: 2125 cp2102_determine_quirks(serial); 2126 break; 2127 case CP210X_PARTNUM_CP2105: 2128 case CP210X_PARTNUM_CP2108: 2129 cp210x_get_fw_version(serial, CP210X_GET_FW_VER); 2130 break; 2131 case CP210X_PARTNUM_CP2102N_QFN28: 2132 case CP210X_PARTNUM_CP2102N_QFN24: 2133 case CP210X_PARTNUM_CP2102N_QFN20: 2134 ret = cp210x_get_fw_version(serial, CP210X_GET_FW_VER_2N); 2135 if (ret) 2136 break; 2137 if (priv->fw_version <= 0x10004) 2138 priv->no_flow_control = true; 2139 break; 2140 default: 2141 break; 2142 } 2143 } 2144 2145 static int cp210x_attach(struct usb_serial *serial) 2146 { 2147 int result; 2148 struct cp210x_serial_private *priv; 2149 2150 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 2151 if (!priv) 2152 return -ENOMEM; 2153 2154 usb_set_serial_data(serial, priv); 2155 2156 cp210x_determine_type(serial); 2157 cp210x_init_max_speed(serial); 2158 2159 result = cp210x_gpio_init(serial); 2160 if (result < 0) { 2161 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n", 2162 result); 2163 } 2164 2165 return 0; 2166 } 2167 2168 static void cp210x_disconnect(struct usb_serial *serial) 2169 { 2170 cp210x_gpio_remove(serial); 2171 } 2172 2173 static void cp210x_release(struct usb_serial *serial) 2174 { 2175 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2176 2177 cp210x_gpio_remove(serial); 2178 2179 kfree(priv); 2180 } 2181 2182 module_usb_serial_driver(serial_drivers, id_table); 2183 2184 MODULE_DESCRIPTION(DRIVER_DESC); 2185 MODULE_LICENSE("GPL v2"); 2186