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 int 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, 0x82AA) }, /* Silicon Labs IFS-USB-DATACABLE used with Quint UPS */ 124 { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */ 125 { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */ 126 { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */ 127 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */ 128 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */ 129 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */ 130 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */ 131 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */ 132 { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */ 133 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */ 134 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ 135 { USB_DEVICE(0x10C4, 0x8414) }, /* Decagon USB Cable Adapter */ 136 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ 137 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 138 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */ 139 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ 140 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */ 141 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */ 142 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */ 143 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */ 144 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ 145 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ 146 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */ 147 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 148 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 149 { USB_DEVICE(0x10C4, 0x87ED) }, /* IMST USB-Stick for Smart Meter */ 150 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */ 151 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */ 152 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */ 153 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */ 154 { USB_DEVICE(0x10C4, 0x88D8) }, /* Acuity Brands nLight Air Adapter */ 155 { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */ 156 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */ 157 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */ 158 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */ 159 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */ 160 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */ 161 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */ 162 { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */ 163 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */ 164 { USB_DEVICE(0x10C4, 0x8A5B) }, /* CEL EM3588 ZigBee USB Stick */ 165 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */ 166 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */ 167 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 168 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 169 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */ 170 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 171 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 172 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */ 173 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */ 174 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 175 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 176 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 177 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 178 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 179 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 180 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */ 181 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */ 182 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 183 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 184 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */ 185 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */ 186 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */ 187 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 188 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */ 189 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */ 190 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */ 191 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */ 192 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */ 193 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */ 194 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 195 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ 196 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ 197 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ 198 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ 199 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ 200 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ 201 { USB_DEVICE(0x17A8, 0x0011) }, /* Kamstrup 444 MHz RF sniffer */ 202 { USB_DEVICE(0x17A8, 0x0013) }, /* Kamstrup 870 MHz RF sniffer */ 203 { USB_DEVICE(0x17A8, 0x0101) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Int Ant) */ 204 { USB_DEVICE(0x17A8, 0x0102) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Ext Ant) */ 205 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 206 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 207 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 208 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */ 209 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */ 210 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */ 211 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */ 212 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */ 213 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */ 214 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */ 215 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */ 216 { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 M.2 Key E serial interface */ 217 { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 Display serial interface */ 218 { USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */ 219 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */ 220 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */ 221 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */ 222 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */ 223 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 224 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */ 225 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 226 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 227 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 228 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 229 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 230 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 231 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 232 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 233 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 234 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 235 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 236 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 237 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 238 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 239 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 240 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 241 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 242 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 243 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 244 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 245 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 246 { USB_DEVICE(0x2184, 0x0030) }, /* GW Instek GDM-834x Digital Multimeter */ 247 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */ 248 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 249 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 250 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 251 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */ 252 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 253 { } /* Terminating Entry */ 254 }; 255 256 MODULE_DEVICE_TABLE(usb, id_table); 257 258 struct cp210x_serial_private { 259 #ifdef CONFIG_GPIOLIB 260 struct gpio_chip gc; 261 bool gpio_registered; 262 u16 gpio_pushpull; 263 u16 gpio_altfunc; 264 u16 gpio_input; 265 #endif 266 u8 partnum; 267 u32 fw_version; 268 speed_t min_speed; 269 speed_t max_speed; 270 bool use_actual_rate; 271 bool no_flow_control; 272 bool no_event_mode; 273 }; 274 275 enum cp210x_event_state { 276 ES_DATA, 277 ES_ESCAPE, 278 ES_LSR, 279 ES_LSR_DATA_0, 280 ES_LSR_DATA_1, 281 ES_MSR 282 }; 283 284 struct cp210x_port_private { 285 u8 bInterfaceNumber; 286 bool event_mode; 287 enum cp210x_event_state event_state; 288 u8 lsr; 289 290 struct mutex mutex; 291 bool crtscts; 292 bool dtr; 293 bool rts; 294 }; 295 296 static struct usb_serial_driver cp210x_device = { 297 .driver = { 298 .owner = THIS_MODULE, 299 .name = "cp210x", 300 }, 301 .id_table = id_table, 302 .num_ports = 1, 303 .bulk_in_size = 256, 304 .bulk_out_size = 256, 305 .open = cp210x_open, 306 .close = cp210x_close, 307 .break_ctl = cp210x_break_ctl, 308 .set_termios = cp210x_set_termios, 309 .tx_empty = cp210x_tx_empty, 310 .throttle = usb_serial_generic_throttle, 311 .unthrottle = usb_serial_generic_unthrottle, 312 .tiocmget = cp210x_tiocmget, 313 .tiocmset = cp210x_tiocmset, 314 .get_icount = usb_serial_generic_get_icount, 315 .attach = cp210x_attach, 316 .disconnect = cp210x_disconnect, 317 .release = cp210x_release, 318 .port_probe = cp210x_port_probe, 319 .port_remove = cp210x_port_remove, 320 .dtr_rts = cp210x_dtr_rts, 321 .process_read_urb = cp210x_process_read_urb, 322 }; 323 324 static struct usb_serial_driver * const serial_drivers[] = { 325 &cp210x_device, NULL 326 }; 327 328 /* Config request types */ 329 #define REQTYPE_HOST_TO_INTERFACE 0x41 330 #define REQTYPE_INTERFACE_TO_HOST 0xc1 331 #define REQTYPE_HOST_TO_DEVICE 0x40 332 #define REQTYPE_DEVICE_TO_HOST 0xc0 333 334 /* Config request codes */ 335 #define CP210X_IFC_ENABLE 0x00 336 #define CP210X_SET_BAUDDIV 0x01 337 #define CP210X_GET_BAUDDIV 0x02 338 #define CP210X_SET_LINE_CTL 0x03 339 #define CP210X_GET_LINE_CTL 0x04 340 #define CP210X_SET_BREAK 0x05 341 #define CP210X_IMM_CHAR 0x06 342 #define CP210X_SET_MHS 0x07 343 #define CP210X_GET_MDMSTS 0x08 344 #define CP210X_SET_XON 0x09 345 #define CP210X_SET_XOFF 0x0A 346 #define CP210X_SET_EVENTMASK 0x0B 347 #define CP210X_GET_EVENTMASK 0x0C 348 #define CP210X_SET_CHAR 0x0D 349 #define CP210X_GET_CHARS 0x0E 350 #define CP210X_GET_PROPS 0x0F 351 #define CP210X_GET_COMM_STATUS 0x10 352 #define CP210X_RESET 0x11 353 #define CP210X_PURGE 0x12 354 #define CP210X_SET_FLOW 0x13 355 #define CP210X_GET_FLOW 0x14 356 #define CP210X_EMBED_EVENTS 0x15 357 #define CP210X_GET_EVENTSTATE 0x16 358 #define CP210X_SET_CHARS 0x19 359 #define CP210X_GET_BAUDRATE 0x1D 360 #define CP210X_SET_BAUDRATE 0x1E 361 #define CP210X_VENDOR_SPECIFIC 0xFF 362 363 /* CP210X_IFC_ENABLE */ 364 #define UART_ENABLE 0x0001 365 #define UART_DISABLE 0x0000 366 367 /* CP210X_(SET|GET)_BAUDDIV */ 368 #define BAUD_RATE_GEN_FREQ 0x384000 369 370 /* CP210X_(SET|GET)_LINE_CTL */ 371 #define BITS_DATA_MASK 0X0f00 372 #define BITS_DATA_5 0X0500 373 #define BITS_DATA_6 0X0600 374 #define BITS_DATA_7 0X0700 375 #define BITS_DATA_8 0X0800 376 #define BITS_DATA_9 0X0900 377 378 #define BITS_PARITY_MASK 0x00f0 379 #define BITS_PARITY_NONE 0x0000 380 #define BITS_PARITY_ODD 0x0010 381 #define BITS_PARITY_EVEN 0x0020 382 #define BITS_PARITY_MARK 0x0030 383 #define BITS_PARITY_SPACE 0x0040 384 385 #define BITS_STOP_MASK 0x000f 386 #define BITS_STOP_1 0x0000 387 #define BITS_STOP_1_5 0x0001 388 #define BITS_STOP_2 0x0002 389 390 /* CP210X_SET_BREAK */ 391 #define BREAK_ON 0x0001 392 #define BREAK_OFF 0x0000 393 394 /* CP210X_(SET_MHS|GET_MDMSTS) */ 395 #define CONTROL_DTR 0x0001 396 #define CONTROL_RTS 0x0002 397 #define CONTROL_CTS 0x0010 398 #define CONTROL_DSR 0x0020 399 #define CONTROL_RING 0x0040 400 #define CONTROL_DCD 0x0080 401 #define CONTROL_WRITE_DTR 0x0100 402 #define CONTROL_WRITE_RTS 0x0200 403 404 /* CP210X_(GET|SET)_CHARS */ 405 struct cp210x_special_chars { 406 u8 bEofChar; 407 u8 bErrorChar; 408 u8 bBreakChar; 409 u8 bEventChar; 410 u8 bXonChar; 411 u8 bXoffChar; 412 }; 413 414 /* CP210X_VENDOR_SPECIFIC values */ 415 #define CP210X_GET_FW_VER 0x000E 416 #define CP210X_READ_2NCONFIG 0x000E 417 #define CP210X_GET_FW_VER_2N 0x0010 418 #define CP210X_READ_LATCH 0x00C2 419 #define CP210X_GET_PARTNUM 0x370B 420 #define CP210X_GET_PORTCONFIG 0x370C 421 #define CP210X_GET_DEVICEMODE 0x3711 422 #define CP210X_WRITE_LATCH 0x37E1 423 424 /* Part number definitions */ 425 #define CP210X_PARTNUM_CP2101 0x01 426 #define CP210X_PARTNUM_CP2102 0x02 427 #define CP210X_PARTNUM_CP2103 0x03 428 #define CP210X_PARTNUM_CP2104 0x04 429 #define CP210X_PARTNUM_CP2105 0x05 430 #define CP210X_PARTNUM_CP2108 0x08 431 #define CP210X_PARTNUM_CP2102N_QFN28 0x20 432 #define CP210X_PARTNUM_CP2102N_QFN24 0x21 433 #define CP210X_PARTNUM_CP2102N_QFN20 0x22 434 #define CP210X_PARTNUM_UNKNOWN 0xFF 435 436 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 437 struct cp210x_comm_status { 438 __le32 ulErrors; 439 __le32 ulHoldReasons; 440 __le32 ulAmountInInQueue; 441 __le32 ulAmountInOutQueue; 442 u8 bEofReceived; 443 u8 bWaitForImmediate; 444 u8 bReserved; 445 } __packed; 446 447 /* 448 * CP210X_PURGE - 16 bits passed in wValue of USB request. 449 * SiLabs app note AN571 gives a strange description of the 4 bits: 450 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 451 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 452 */ 453 #define PURGE_ALL 0x000f 454 455 /* CP210X_EMBED_EVENTS */ 456 #define CP210X_ESCCHAR 0xec 457 458 #define CP210X_LSR_OVERRUN BIT(1) 459 #define CP210X_LSR_PARITY BIT(2) 460 #define CP210X_LSR_FRAME BIT(3) 461 #define CP210X_LSR_BREAK BIT(4) 462 463 464 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */ 465 struct cp210x_flow_ctl { 466 __le32 ulControlHandshake; 467 __le32 ulFlowReplace; 468 __le32 ulXonLimit; 469 __le32 ulXoffLimit; 470 }; 471 472 /* cp210x_flow_ctl::ulControlHandshake */ 473 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0) 474 #define CP210X_SERIAL_DTR_INACTIVE (0 << 0) 475 #define CP210X_SERIAL_DTR_ACTIVE (1 << 0) 476 #define CP210X_SERIAL_DTR_FLOW_CTL (2 << 0) 477 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3) 478 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4) 479 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5) 480 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6) 481 482 /* cp210x_flow_ctl::ulFlowReplace */ 483 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0) 484 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1) 485 #define CP210X_SERIAL_ERROR_CHAR BIT(2) 486 #define CP210X_SERIAL_NULL_STRIPPING BIT(3) 487 #define CP210X_SERIAL_BREAK_CHAR BIT(4) 488 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6) 489 #define CP210X_SERIAL_RTS_INACTIVE (0 << 6) 490 #define CP210X_SERIAL_RTS_ACTIVE (1 << 6) 491 #define CP210X_SERIAL_RTS_FLOW_CTL (2 << 6) 492 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31) 493 494 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */ 495 struct cp210x_pin_mode { 496 u8 eci; 497 u8 sci; 498 }; 499 500 #define CP210X_PIN_MODE_MODEM 0 501 #define CP210X_PIN_MODE_GPIO BIT(0) 502 503 /* 504 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes 505 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes. 506 */ 507 struct cp210x_dual_port_config { 508 __le16 gpio_mode; 509 u8 __pad0[2]; 510 __le16 reset_state; 511 u8 __pad1[4]; 512 __le16 suspend_state; 513 u8 sci_cfg; 514 u8 eci_cfg; 515 u8 device_cfg; 516 } __packed; 517 518 /* 519 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes 520 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes. 521 */ 522 struct cp210x_single_port_config { 523 __le16 gpio_mode; 524 u8 __pad0[2]; 525 __le16 reset_state; 526 u8 __pad1[4]; 527 __le16 suspend_state; 528 u8 device_cfg; 529 } __packed; 530 531 /* GPIO modes */ 532 #define CP210X_SCI_GPIO_MODE_OFFSET 9 533 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9) 534 535 #define CP210X_ECI_GPIO_MODE_OFFSET 2 536 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2) 537 538 #define CP210X_GPIO_MODE_OFFSET 8 539 #define CP210X_GPIO_MODE_MASK GENMASK(11, 8) 540 541 /* CP2105 port configuration values */ 542 #define CP2105_GPIO0_TXLED_MODE BIT(0) 543 #define CP2105_GPIO1_RXLED_MODE BIT(1) 544 #define CP2105_GPIO1_RS485_MODE BIT(2) 545 546 /* CP2104 port configuration values */ 547 #define CP2104_GPIO0_TXLED_MODE BIT(0) 548 #define CP2104_GPIO1_RXLED_MODE BIT(1) 549 #define CP2104_GPIO2_RS485_MODE BIT(2) 550 551 struct cp210x_quad_port_state { 552 __le16 gpio_mode_pb0; 553 __le16 gpio_mode_pb1; 554 __le16 gpio_mode_pb2; 555 __le16 gpio_mode_pb3; 556 __le16 gpio_mode_pb4; 557 558 __le16 gpio_lowpower_pb0; 559 __le16 gpio_lowpower_pb1; 560 __le16 gpio_lowpower_pb2; 561 __le16 gpio_lowpower_pb3; 562 __le16 gpio_lowpower_pb4; 563 564 __le16 gpio_latch_pb0; 565 __le16 gpio_latch_pb1; 566 __le16 gpio_latch_pb2; 567 __le16 gpio_latch_pb3; 568 __le16 gpio_latch_pb4; 569 }; 570 571 /* 572 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0x49 bytes 573 * on a CP2108 chip. 574 * 575 * See https://www.silabs.com/documents/public/application-notes/an978-cp210x-usb-to-uart-api-specification.pdf 576 */ 577 struct cp210x_quad_port_config { 578 struct cp210x_quad_port_state reset_state; 579 struct cp210x_quad_port_state suspend_state; 580 u8 ipdelay_ifc[4]; 581 u8 enhancedfxn_ifc[4]; 582 u8 enhancedfxn_device; 583 u8 extclkfreq[4]; 584 } __packed; 585 586 #define CP2108_EF_IFC_GPIO_TXLED 0x01 587 #define CP2108_EF_IFC_GPIO_RXLED 0x02 588 #define CP2108_EF_IFC_GPIO_RS485 0x04 589 #define CP2108_EF_IFC_GPIO_RS485_LOGIC 0x08 590 #define CP2108_EF_IFC_GPIO_CLOCK 0x10 591 #define CP2108_EF_IFC_DYNAMIC_SUSPEND 0x40 592 593 /* CP2102N configuration array indices */ 594 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2 595 #define CP210X_2NCONFIG_GPIO_MODE_IDX 581 596 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587 597 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600 598 599 /* CP2102N QFN20 port configuration values */ 600 #define CP2102N_QFN20_GPIO2_TXLED_MODE BIT(2) 601 #define CP2102N_QFN20_GPIO3_RXLED_MODE BIT(3) 602 #define CP2102N_QFN20_GPIO1_RS485_MODE BIT(4) 603 #define CP2102N_QFN20_GPIO0_CLK_MODE BIT(6) 604 605 /* 606 * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x02 bytes 607 * for CP2102N, CP2103, CP2104 and CP2105. 608 */ 609 struct cp210x_gpio_write { 610 u8 mask; 611 u8 state; 612 }; 613 614 /* 615 * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x04 bytes 616 * for CP2108. 617 */ 618 struct cp210x_gpio_write16 { 619 __le16 mask; 620 __le16 state; 621 }; 622 623 /* 624 * Helper to get interface number when we only have struct usb_serial. 625 */ 626 static u8 cp210x_interface_num(struct usb_serial *serial) 627 { 628 struct usb_host_interface *cur_altsetting; 629 630 cur_altsetting = serial->interface->cur_altsetting; 631 632 return cur_altsetting->desc.bInterfaceNumber; 633 } 634 635 /* 636 * Reads a variable-sized block of CP210X_ registers, identified by req. 637 * Returns data into buf in native USB byte order. 638 */ 639 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, 640 void *buf, int bufsize) 641 { 642 struct usb_serial *serial = port->serial; 643 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 644 int result; 645 646 647 result = usb_control_msg_recv(serial->dev, 0, req, 648 REQTYPE_INTERFACE_TO_HOST, 0, 649 port_priv->bInterfaceNumber, buf, bufsize, 650 USB_CTRL_SET_TIMEOUT, GFP_KERNEL); 651 if (result) { 652 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", 653 req, bufsize, result); 654 return result; 655 } 656 657 return 0; 658 } 659 660 /* 661 * Reads any 8-bit CP210X_ register identified by req. 662 */ 663 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val) 664 { 665 return cp210x_read_reg_block(port, req, val, sizeof(*val)); 666 } 667 668 /* 669 * Reads a variable-sized vendor block of CP210X_ registers, identified by val. 670 * Returns data into buf in native USB byte order. 671 */ 672 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val, 673 void *buf, int bufsize) 674 { 675 int result; 676 677 result = usb_control_msg_recv(serial->dev, 0, CP210X_VENDOR_SPECIFIC, 678 type, val, cp210x_interface_num(serial), buf, bufsize, 679 USB_CTRL_GET_TIMEOUT, GFP_KERNEL); 680 if (result) { 681 dev_err(&serial->interface->dev, 682 "failed to get vendor val 0x%04x size %d: %d\n", val, 683 bufsize, result); 684 return result; 685 } 686 687 return 0; 688 } 689 690 /* 691 * Writes any 16-bit CP210X_ register (req) whose value is passed 692 * entirely in the wValue field of the USB request. 693 */ 694 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) 695 { 696 struct usb_serial *serial = port->serial; 697 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 698 int result; 699 700 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 701 req, REQTYPE_HOST_TO_INTERFACE, val, 702 port_priv->bInterfaceNumber, NULL, 0, 703 USB_CTRL_SET_TIMEOUT); 704 if (result < 0) { 705 dev_err(&port->dev, "failed set request 0x%x status: %d\n", 706 req, result); 707 } 708 709 return result; 710 } 711 712 /* 713 * Writes a variable-sized block of CP210X_ registers, identified by req. 714 * Data in buf must be in native USB byte order. 715 */ 716 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req, 717 void *buf, int bufsize) 718 { 719 struct usb_serial *serial = port->serial; 720 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 721 int result; 722 723 result = usb_control_msg_send(serial->dev, 0, req, 724 REQTYPE_HOST_TO_INTERFACE, 0, 725 port_priv->bInterfaceNumber, buf, bufsize, 726 USB_CTRL_SET_TIMEOUT, GFP_KERNEL); 727 if (result) { 728 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", 729 req, bufsize, result); 730 return result; 731 } 732 733 return 0; 734 } 735 736 /* 737 * Writes any 32-bit CP210X_ register identified by req. 738 */ 739 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) 740 { 741 __le32 le32_val; 742 743 le32_val = cpu_to_le32(val); 744 745 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); 746 } 747 748 #ifdef CONFIG_GPIOLIB 749 /* 750 * Writes a variable-sized vendor block of CP210X_ registers, identified by val. 751 * Data in buf must be in native USB byte order. 752 */ 753 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type, 754 u16 val, void *buf, int bufsize) 755 { 756 int result; 757 758 result = usb_control_msg_send(serial->dev, 0, CP210X_VENDOR_SPECIFIC, 759 type, val, cp210x_interface_num(serial), buf, bufsize, 760 USB_CTRL_SET_TIMEOUT, GFP_KERNEL); 761 if (result) { 762 dev_err(&serial->interface->dev, 763 "failed to set vendor val 0x%04x size %d: %d\n", val, 764 bufsize, result); 765 return result; 766 } 767 768 return 0; 769 } 770 #endif 771 772 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 773 { 774 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 775 int result; 776 777 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 778 if (result) { 779 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 780 return result; 781 } 782 783 if (tty) 784 cp210x_set_termios(tty, port, NULL); 785 786 result = usb_serial_generic_open(tty, port); 787 if (result) 788 goto err_disable; 789 790 return 0; 791 792 err_disable: 793 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 794 port_priv->event_mode = false; 795 796 return result; 797 } 798 799 static void cp210x_close(struct usb_serial_port *port) 800 { 801 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 802 803 usb_serial_generic_close(port); 804 805 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 806 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 807 808 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 809 810 /* Disabling the interface disables event-insertion mode. */ 811 port_priv->event_mode = false; 812 } 813 814 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag) 815 { 816 if (lsr & CP210X_LSR_BREAK) { 817 port->icount.brk++; 818 *flag = TTY_BREAK; 819 } else if (lsr & CP210X_LSR_PARITY) { 820 port->icount.parity++; 821 *flag = TTY_PARITY; 822 } else if (lsr & CP210X_LSR_FRAME) { 823 port->icount.frame++; 824 *flag = TTY_FRAME; 825 } 826 827 if (lsr & CP210X_LSR_OVERRUN) { 828 port->icount.overrun++; 829 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); 830 } 831 } 832 833 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag) 834 { 835 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 836 837 switch (port_priv->event_state) { 838 case ES_DATA: 839 if (*ch == CP210X_ESCCHAR) { 840 port_priv->event_state = ES_ESCAPE; 841 break; 842 } 843 return false; 844 case ES_ESCAPE: 845 switch (*ch) { 846 case 0: 847 dev_dbg(&port->dev, "%s - escape char\n", __func__); 848 *ch = CP210X_ESCCHAR; 849 port_priv->event_state = ES_DATA; 850 return false; 851 case 1: 852 port_priv->event_state = ES_LSR_DATA_0; 853 break; 854 case 2: 855 port_priv->event_state = ES_LSR; 856 break; 857 case 3: 858 port_priv->event_state = ES_MSR; 859 break; 860 default: 861 dev_err(&port->dev, "malformed event 0x%02x\n", *ch); 862 port_priv->event_state = ES_DATA; 863 break; 864 } 865 break; 866 case ES_LSR_DATA_0: 867 port_priv->lsr = *ch; 868 port_priv->event_state = ES_LSR_DATA_1; 869 break; 870 case ES_LSR_DATA_1: 871 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n", 872 __func__, port_priv->lsr, *ch); 873 cp210x_process_lsr(port, port_priv->lsr, flag); 874 port_priv->event_state = ES_DATA; 875 return false; 876 case ES_LSR: 877 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch); 878 port_priv->lsr = *ch; 879 cp210x_process_lsr(port, port_priv->lsr, flag); 880 port_priv->event_state = ES_DATA; 881 break; 882 case ES_MSR: 883 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch); 884 /* unimplemented */ 885 port_priv->event_state = ES_DATA; 886 break; 887 } 888 889 return true; 890 } 891 892 static void cp210x_process_read_urb(struct urb *urb) 893 { 894 struct usb_serial_port *port = urb->context; 895 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 896 unsigned char *ch = urb->transfer_buffer; 897 char flag; 898 int i; 899 900 if (!urb->actual_length) 901 return; 902 903 if (port_priv->event_mode) { 904 for (i = 0; i < urb->actual_length; i++, ch++) { 905 flag = TTY_NORMAL; 906 907 if (cp210x_process_char(port, ch, &flag)) 908 continue; 909 910 tty_insert_flip_char(&port->port, *ch, flag); 911 } 912 } else { 913 tty_insert_flip_string(&port->port, ch, urb->actual_length); 914 } 915 tty_flip_buffer_push(&port->port); 916 } 917 918 /* 919 * Read how many bytes are waiting in the TX queue. 920 */ 921 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 922 u32 *count) 923 { 924 struct usb_serial *serial = port->serial; 925 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 926 struct cp210x_comm_status sts; 927 int result; 928 929 result = usb_control_msg_recv(serial->dev, 0, CP210X_GET_COMM_STATUS, 930 REQTYPE_INTERFACE_TO_HOST, 0, 931 port_priv->bInterfaceNumber, &sts, sizeof(sts), 932 USB_CTRL_GET_TIMEOUT, GFP_KERNEL); 933 if (result) { 934 dev_err(&port->dev, "failed to get comm status: %d\n", result); 935 return result; 936 } 937 938 *count = le32_to_cpu(sts.ulAmountInOutQueue); 939 940 return 0; 941 } 942 943 static bool cp210x_tx_empty(struct usb_serial_port *port) 944 { 945 int err; 946 u32 count; 947 948 err = cp210x_get_tx_queue_byte_count(port, &count); 949 if (err) 950 return true; 951 952 return !count; 953 } 954 955 struct cp210x_rate { 956 speed_t rate; 957 speed_t high; 958 }; 959 960 static const struct cp210x_rate cp210x_an205_table1[] = { 961 { 300, 300 }, 962 { 600, 600 }, 963 { 1200, 1200 }, 964 { 1800, 1800 }, 965 { 2400, 2400 }, 966 { 4000, 4000 }, 967 { 4800, 4803 }, 968 { 7200, 7207 }, 969 { 9600, 9612 }, 970 { 14400, 14428 }, 971 { 16000, 16062 }, 972 { 19200, 19250 }, 973 { 28800, 28912 }, 974 { 38400, 38601 }, 975 { 51200, 51558 }, 976 { 56000, 56280 }, 977 { 57600, 58053 }, 978 { 64000, 64111 }, 979 { 76800, 77608 }, 980 { 115200, 117028 }, 981 { 128000, 129347 }, 982 { 153600, 156868 }, 983 { 230400, 237832 }, 984 { 250000, 254234 }, 985 { 256000, 273066 }, 986 { 460800, 491520 }, 987 { 500000, 567138 }, 988 { 576000, 670254 }, 989 { 921600, UINT_MAX } 990 }; 991 992 /* 993 * Quantises the baud rate as per AN205 Table 1 994 */ 995 static speed_t cp210x_get_an205_rate(speed_t baud) 996 { 997 int i; 998 999 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) { 1000 if (baud <= cp210x_an205_table1[i].high) 1001 break; 1002 } 1003 1004 return cp210x_an205_table1[i].rate; 1005 } 1006 1007 static speed_t cp210x_get_actual_rate(speed_t baud) 1008 { 1009 unsigned int prescale = 1; 1010 unsigned int div; 1011 1012 if (baud <= 365) 1013 prescale = 4; 1014 1015 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud); 1016 baud = 48000000 / (2 * prescale * div); 1017 1018 return baud; 1019 } 1020 1021 /* 1022 * CP2101 supports the following baud rates: 1023 * 1024 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 1025 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 1026 * 1027 * CP2102 and CP2103 support the following additional rates: 1028 * 1029 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 1030 * 576000 1031 * 1032 * The device will map a requested rate to a supported one, but the result 1033 * of requests for rates greater than 1053257 is undefined (see AN205). 1034 * 1035 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 1036 * respectively, with an error less than 1%. The actual rates are determined 1037 * by 1038 * 1039 * div = round(freq / (2 x prescale x request)) 1040 * actual = freq / (2 x prescale x div) 1041 * 1042 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 1043 * or 1 otherwise. 1044 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 1045 * otherwise. 1046 */ 1047 static void cp210x_change_speed(struct tty_struct *tty, 1048 struct usb_serial_port *port, 1049 const struct ktermios *old_termios) 1050 { 1051 struct usb_serial *serial = port->serial; 1052 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1053 u32 baud; 1054 1055 if (tty->termios.c_ospeed == 0) 1056 return; 1057 1058 /* 1059 * This maps the requested rate to the actual rate, a valid rate on 1060 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed]. 1061 */ 1062 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed); 1063 1064 if (priv->use_actual_rate) 1065 baud = cp210x_get_actual_rate(baud); 1066 else if (baud < 1000000) 1067 baud = cp210x_get_an205_rate(baud); 1068 1069 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 1070 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { 1071 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 1072 if (old_termios) 1073 baud = old_termios->c_ospeed; 1074 else 1075 baud = 9600; 1076 } 1077 1078 tty_encode_baud_rate(tty, baud, baud); 1079 } 1080 1081 static void cp210x_enable_event_mode(struct usb_serial_port *port) 1082 { 1083 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1084 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1085 int ret; 1086 1087 if (port_priv->event_mode) 1088 return; 1089 1090 if (priv->no_event_mode) 1091 return; 1092 1093 port_priv->event_state = ES_DATA; 1094 port_priv->event_mode = true; 1095 1096 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR); 1097 if (ret) { 1098 dev_err(&port->dev, "failed to enable events: %d\n", ret); 1099 port_priv->event_mode = false; 1100 } 1101 } 1102 1103 static void cp210x_disable_event_mode(struct usb_serial_port *port) 1104 { 1105 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1106 int ret; 1107 1108 if (!port_priv->event_mode) 1109 return; 1110 1111 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0); 1112 if (ret) { 1113 dev_err(&port->dev, "failed to disable events: %d\n", ret); 1114 return; 1115 } 1116 1117 port_priv->event_mode = false; 1118 } 1119 1120 static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b) 1121 { 1122 bool iflag_change, cc_change; 1123 1124 iflag_change = ((a->c_iflag ^ b->c_iflag) & (INPCK | IXON | IXOFF)); 1125 cc_change = a->c_cc[VSTART] != b->c_cc[VSTART] || 1126 a->c_cc[VSTOP] != b->c_cc[VSTOP]; 1127 1128 return tty_termios_hw_change(a, b) || iflag_change || cc_change; 1129 } 1130 1131 static void cp210x_set_flow_control(struct tty_struct *tty, 1132 struct usb_serial_port *port, 1133 const struct ktermios *old_termios) 1134 { 1135 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1136 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1137 struct cp210x_special_chars chars; 1138 struct cp210x_flow_ctl flow_ctl; 1139 u32 flow_repl; 1140 u32 ctl_hs; 1141 bool crtscts; 1142 int ret; 1143 1144 /* 1145 * Some CP2102N interpret ulXonLimit as ulFlowReplace (erratum 1146 * CP2102N_E104). Report back that flow control is not supported. 1147 */ 1148 if (priv->no_flow_control) { 1149 tty->termios.c_cflag &= ~CRTSCTS; 1150 tty->termios.c_iflag &= ~(IXON | IXOFF); 1151 } 1152 1153 if (tty->termios.c_ospeed != 0 && 1154 old_termios && old_termios->c_ospeed != 0 && 1155 C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) && 1156 I_IXON(tty) == (old_termios->c_iflag & IXON) && 1157 I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) && 1158 START_CHAR(tty) == old_termios->c_cc[VSTART] && 1159 STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) { 1160 return; 1161 } 1162 1163 if (I_IXON(tty) || I_IXOFF(tty)) { 1164 memset(&chars, 0, sizeof(chars)); 1165 1166 chars.bXonChar = START_CHAR(tty); 1167 chars.bXoffChar = STOP_CHAR(tty); 1168 1169 ret = cp210x_write_reg_block(port, CP210X_SET_CHARS, &chars, 1170 sizeof(chars)); 1171 if (ret) { 1172 dev_err(&port->dev, "failed to set special chars: %d\n", 1173 ret); 1174 } 1175 } 1176 1177 mutex_lock(&port_priv->mutex); 1178 1179 if (tty->termios.c_ospeed == 0) { 1180 port_priv->dtr = false; 1181 port_priv->rts = false; 1182 } else if (old_termios && old_termios->c_ospeed == 0) { 1183 port_priv->dtr = true; 1184 port_priv->rts = true; 1185 } 1186 1187 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1188 sizeof(flow_ctl)); 1189 if (ret) 1190 goto out_unlock; 1191 1192 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1193 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1194 1195 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE; 1196 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE; 1197 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY; 1198 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1199 if (port_priv->dtr) 1200 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE; 1201 else 1202 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE; 1203 1204 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1205 if (C_CRTSCTS(tty)) { 1206 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE; 1207 if (port_priv->rts) 1208 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL; 1209 else 1210 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1211 crtscts = true; 1212 } else { 1213 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE; 1214 if (port_priv->rts) 1215 flow_repl |= CP210X_SERIAL_RTS_ACTIVE; 1216 else 1217 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1218 crtscts = false; 1219 } 1220 1221 if (I_IXOFF(tty)) { 1222 flow_repl |= CP210X_SERIAL_AUTO_RECEIVE; 1223 1224 flow_ctl.ulXonLimit = cpu_to_le32(128); 1225 flow_ctl.ulXoffLimit = cpu_to_le32(128); 1226 } else { 1227 flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE; 1228 } 1229 1230 if (I_IXON(tty)) 1231 flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT; 1232 else 1233 flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT; 1234 1235 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__, 1236 ctl_hs, flow_repl); 1237 1238 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1239 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1240 1241 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1242 sizeof(flow_ctl)); 1243 if (ret) 1244 goto out_unlock; 1245 1246 port_priv->crtscts = crtscts; 1247 out_unlock: 1248 mutex_unlock(&port_priv->mutex); 1249 } 1250 1251 static void cp210x_set_termios(struct tty_struct *tty, 1252 struct usb_serial_port *port, 1253 const struct ktermios *old_termios) 1254 { 1255 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1256 u16 bits; 1257 int ret; 1258 1259 if (old_termios && !cp210x_termios_change(&tty->termios, old_termios) && 1260 tty->termios.c_ospeed != 0) 1261 return; 1262 1263 if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed) 1264 cp210x_change_speed(tty, port, old_termios); 1265 1266 /* CP2101 only supports CS8, 1 stop bit and non-stick parity. */ 1267 if (priv->partnum == CP210X_PARTNUM_CP2101) { 1268 tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR); 1269 tty->termios.c_cflag |= CS8; 1270 } 1271 1272 bits = 0; 1273 1274 switch (C_CSIZE(tty)) { 1275 case CS5: 1276 bits |= BITS_DATA_5; 1277 break; 1278 case CS6: 1279 bits |= BITS_DATA_6; 1280 break; 1281 case CS7: 1282 bits |= BITS_DATA_7; 1283 break; 1284 case CS8: 1285 default: 1286 bits |= BITS_DATA_8; 1287 break; 1288 } 1289 1290 if (C_PARENB(tty)) { 1291 if (C_CMSPAR(tty)) { 1292 if (C_PARODD(tty)) 1293 bits |= BITS_PARITY_MARK; 1294 else 1295 bits |= BITS_PARITY_SPACE; 1296 } else { 1297 if (C_PARODD(tty)) 1298 bits |= BITS_PARITY_ODD; 1299 else 1300 bits |= BITS_PARITY_EVEN; 1301 } 1302 } 1303 1304 if (C_CSTOPB(tty)) 1305 bits |= BITS_STOP_2; 1306 else 1307 bits |= BITS_STOP_1; 1308 1309 ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1310 if (ret) 1311 dev_err(&port->dev, "failed to set line control: %d\n", ret); 1312 1313 cp210x_set_flow_control(tty, port, old_termios); 1314 1315 /* 1316 * Enable event-insertion mode only if input parity checking is 1317 * enabled for now. 1318 */ 1319 if (I_INPCK(tty)) 1320 cp210x_enable_event_mode(port); 1321 else 1322 cp210x_disable_event_mode(port); 1323 } 1324 1325 static int cp210x_tiocmset(struct tty_struct *tty, 1326 unsigned int set, unsigned int clear) 1327 { 1328 struct usb_serial_port *port = tty->driver_data; 1329 return cp210x_tiocmset_port(port, set, clear); 1330 } 1331 1332 static int cp210x_tiocmset_port(struct usb_serial_port *port, 1333 unsigned int set, unsigned int clear) 1334 { 1335 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1336 struct cp210x_flow_ctl flow_ctl; 1337 u32 ctl_hs, flow_repl; 1338 u16 control = 0; 1339 int ret; 1340 1341 mutex_lock(&port_priv->mutex); 1342 1343 if (set & TIOCM_RTS) { 1344 port_priv->rts = true; 1345 control |= CONTROL_RTS; 1346 control |= CONTROL_WRITE_RTS; 1347 } 1348 if (set & TIOCM_DTR) { 1349 port_priv->dtr = true; 1350 control |= CONTROL_DTR; 1351 control |= CONTROL_WRITE_DTR; 1352 } 1353 if (clear & TIOCM_RTS) { 1354 port_priv->rts = false; 1355 control &= ~CONTROL_RTS; 1356 control |= CONTROL_WRITE_RTS; 1357 } 1358 if (clear & TIOCM_DTR) { 1359 port_priv->dtr = false; 1360 control &= ~CONTROL_DTR; 1361 control |= CONTROL_WRITE_DTR; 1362 } 1363 1364 /* 1365 * Use SET_FLOW to set DTR and enable/disable auto-RTS when hardware 1366 * flow control is enabled. 1367 */ 1368 if (port_priv->crtscts && control & CONTROL_WRITE_RTS) { 1369 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1370 sizeof(flow_ctl)); 1371 if (ret) 1372 goto out_unlock; 1373 1374 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1375 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1376 1377 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1378 if (port_priv->dtr) 1379 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE; 1380 else 1381 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE; 1382 1383 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1384 if (port_priv->rts) 1385 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL; 1386 else 1387 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1388 1389 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1390 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1391 1392 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", 1393 __func__, ctl_hs, flow_repl); 1394 1395 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1396 sizeof(flow_ctl)); 1397 } else { 1398 dev_dbg(&port->dev, "%s - control = 0x%04x\n", __func__, control); 1399 1400 ret = cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1401 } 1402 out_unlock: 1403 mutex_unlock(&port_priv->mutex); 1404 1405 return ret; 1406 } 1407 1408 static void cp210x_dtr_rts(struct usb_serial_port *port, int on) 1409 { 1410 if (on) 1411 cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0); 1412 else 1413 cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS); 1414 } 1415 1416 static int cp210x_tiocmget(struct tty_struct *tty) 1417 { 1418 struct usb_serial_port *port = tty->driver_data; 1419 u8 control; 1420 int result; 1421 1422 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1423 if (result) 1424 return result; 1425 1426 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1427 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1428 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1429 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1430 |((control & CONTROL_RING)? TIOCM_RI : 0) 1431 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1432 1433 dev_dbg(&port->dev, "%s - control = 0x%02x\n", __func__, control); 1434 1435 return result; 1436 } 1437 1438 static int cp210x_break_ctl(struct tty_struct *tty, int break_state) 1439 { 1440 struct usb_serial_port *port = tty->driver_data; 1441 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1442 u16 state; 1443 1444 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1445 if (cp210x_interface_num(port->serial) == 1) 1446 return -ENOTTY; 1447 } 1448 1449 if (break_state == 0) 1450 state = BREAK_OFF; 1451 else 1452 state = BREAK_ON; 1453 1454 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1455 state == BREAK_OFF ? "off" : "on"); 1456 1457 return cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1458 } 1459 1460 #ifdef CONFIG_GPIOLIB 1461 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio) 1462 { 1463 struct usb_serial *serial = gpiochip_get_data(gc); 1464 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1465 u8 req_type; 1466 u16 mask; 1467 int result; 1468 int len; 1469 1470 result = usb_autopm_get_interface(serial->interface); 1471 if (result) 1472 return result; 1473 1474 switch (priv->partnum) { 1475 case CP210X_PARTNUM_CP2105: 1476 req_type = REQTYPE_INTERFACE_TO_HOST; 1477 len = 1; 1478 break; 1479 case CP210X_PARTNUM_CP2108: 1480 req_type = REQTYPE_INTERFACE_TO_HOST; 1481 len = 2; 1482 break; 1483 default: 1484 req_type = REQTYPE_DEVICE_TO_HOST; 1485 len = 1; 1486 break; 1487 } 1488 1489 mask = 0; 1490 result = cp210x_read_vendor_block(serial, req_type, CP210X_READ_LATCH, 1491 &mask, len); 1492 1493 usb_autopm_put_interface(serial->interface); 1494 1495 if (result < 0) 1496 return result; 1497 1498 le16_to_cpus(&mask); 1499 1500 return !!(mask & BIT(gpio)); 1501 } 1502 1503 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value) 1504 { 1505 struct usb_serial *serial = gpiochip_get_data(gc); 1506 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1507 struct cp210x_gpio_write16 buf16; 1508 struct cp210x_gpio_write buf; 1509 u16 mask, state; 1510 u16 wIndex; 1511 int result; 1512 1513 if (value == 1) 1514 state = BIT(gpio); 1515 else 1516 state = 0; 1517 1518 mask = BIT(gpio); 1519 1520 result = usb_autopm_get_interface(serial->interface); 1521 if (result) 1522 goto out; 1523 1524 switch (priv->partnum) { 1525 case CP210X_PARTNUM_CP2105: 1526 buf.mask = (u8)mask; 1527 buf.state = (u8)state; 1528 result = cp210x_write_vendor_block(serial, 1529 REQTYPE_HOST_TO_INTERFACE, 1530 CP210X_WRITE_LATCH, &buf, 1531 sizeof(buf)); 1532 break; 1533 case CP210X_PARTNUM_CP2108: 1534 buf16.mask = cpu_to_le16(mask); 1535 buf16.state = cpu_to_le16(state); 1536 result = cp210x_write_vendor_block(serial, 1537 REQTYPE_HOST_TO_INTERFACE, 1538 CP210X_WRITE_LATCH, &buf16, 1539 sizeof(buf16)); 1540 break; 1541 default: 1542 wIndex = state << 8 | mask; 1543 result = usb_control_msg(serial->dev, 1544 usb_sndctrlpipe(serial->dev, 0), 1545 CP210X_VENDOR_SPECIFIC, 1546 REQTYPE_HOST_TO_DEVICE, 1547 CP210X_WRITE_LATCH, 1548 wIndex, 1549 NULL, 0, USB_CTRL_SET_TIMEOUT); 1550 break; 1551 } 1552 1553 usb_autopm_put_interface(serial->interface); 1554 out: 1555 if (result < 0) { 1556 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n", 1557 result); 1558 } 1559 } 1560 1561 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio) 1562 { 1563 struct usb_serial *serial = gpiochip_get_data(gc); 1564 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1565 1566 return priv->gpio_input & BIT(gpio); 1567 } 1568 1569 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio) 1570 { 1571 struct usb_serial *serial = gpiochip_get_data(gc); 1572 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1573 1574 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1575 /* hardware does not support an input mode */ 1576 return -ENOTSUPP; 1577 } 1578 1579 /* push-pull pins cannot be changed to be inputs */ 1580 if (priv->gpio_pushpull & BIT(gpio)) 1581 return -EINVAL; 1582 1583 /* make sure to release pin if it is being driven low */ 1584 cp210x_gpio_set(gc, gpio, 1); 1585 1586 priv->gpio_input |= BIT(gpio); 1587 1588 return 0; 1589 } 1590 1591 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio, 1592 int value) 1593 { 1594 struct usb_serial *serial = gpiochip_get_data(gc); 1595 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1596 1597 priv->gpio_input &= ~BIT(gpio); 1598 cp210x_gpio_set(gc, gpio, value); 1599 1600 return 0; 1601 } 1602 1603 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio, 1604 unsigned long config) 1605 { 1606 struct usb_serial *serial = gpiochip_get_data(gc); 1607 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1608 enum pin_config_param param = pinconf_to_config_param(config); 1609 1610 /* Succeed only if in correct mode (this can't be set at runtime) */ 1611 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) && 1612 (priv->gpio_pushpull & BIT(gpio))) 1613 return 0; 1614 1615 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) && 1616 !(priv->gpio_pushpull & BIT(gpio))) 1617 return 0; 1618 1619 return -ENOTSUPP; 1620 } 1621 1622 static int cp210x_gpio_init_valid_mask(struct gpio_chip *gc, 1623 unsigned long *valid_mask, unsigned int ngpios) 1624 { 1625 struct usb_serial *serial = gpiochip_get_data(gc); 1626 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1627 struct device *dev = &serial->interface->dev; 1628 unsigned long altfunc_mask = priv->gpio_altfunc; 1629 1630 bitmap_complement(valid_mask, &altfunc_mask, ngpios); 1631 1632 if (bitmap_empty(valid_mask, ngpios)) 1633 dev_dbg(dev, "no pin configured for GPIO\n"); 1634 else 1635 dev_dbg(dev, "GPIO.%*pbl configured for GPIO\n", ngpios, 1636 valid_mask); 1637 return 0; 1638 } 1639 1640 /* 1641 * This function is for configuring GPIO using shared pins, where other signals 1642 * are made unavailable by configuring the use of GPIO. This is believed to be 1643 * only applicable to the cp2105 at this point, the other devices supported by 1644 * this driver that provide GPIO do so in a way that does not impact other 1645 * signals and are thus expected to have very different initialisation. 1646 */ 1647 static int cp2105_gpioconf_init(struct usb_serial *serial) 1648 { 1649 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1650 struct cp210x_pin_mode mode; 1651 struct cp210x_dual_port_config config; 1652 u8 intf_num = cp210x_interface_num(serial); 1653 u8 iface_config; 1654 int result; 1655 1656 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1657 CP210X_GET_DEVICEMODE, &mode, 1658 sizeof(mode)); 1659 if (result < 0) 1660 return result; 1661 1662 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1663 CP210X_GET_PORTCONFIG, &config, 1664 sizeof(config)); 1665 if (result < 0) 1666 return result; 1667 1668 /* 2 banks of GPIO - One for the pins taken from each serial port */ 1669 if (intf_num == 0) { 1670 priv->gc.ngpio = 2; 1671 1672 if (mode.eci == CP210X_PIN_MODE_MODEM) { 1673 /* mark all GPIOs of this interface as reserved */ 1674 priv->gpio_altfunc = 0xff; 1675 return 0; 1676 } 1677 1678 iface_config = config.eci_cfg; 1679 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1680 CP210X_ECI_GPIO_MODE_MASK) >> 1681 CP210X_ECI_GPIO_MODE_OFFSET); 1682 } else if (intf_num == 1) { 1683 priv->gc.ngpio = 3; 1684 1685 if (mode.sci == CP210X_PIN_MODE_MODEM) { 1686 /* mark all GPIOs of this interface as reserved */ 1687 priv->gpio_altfunc = 0xff; 1688 return 0; 1689 } 1690 1691 iface_config = config.sci_cfg; 1692 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1693 CP210X_SCI_GPIO_MODE_MASK) >> 1694 CP210X_SCI_GPIO_MODE_OFFSET); 1695 } else { 1696 return -ENODEV; 1697 } 1698 1699 /* mark all pins which are not in GPIO mode */ 1700 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */ 1701 priv->gpio_altfunc |= BIT(0); 1702 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */ 1703 CP2105_GPIO1_RS485_MODE)) 1704 priv->gpio_altfunc |= BIT(1); 1705 1706 /* driver implementation for CP2105 only supports outputs */ 1707 priv->gpio_input = 0; 1708 1709 return 0; 1710 } 1711 1712 static int cp2104_gpioconf_init(struct usb_serial *serial) 1713 { 1714 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1715 struct cp210x_single_port_config config; 1716 u8 iface_config; 1717 u8 gpio_latch; 1718 int result; 1719 u8 i; 1720 1721 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1722 CP210X_GET_PORTCONFIG, &config, 1723 sizeof(config)); 1724 if (result < 0) 1725 return result; 1726 1727 priv->gc.ngpio = 4; 1728 1729 iface_config = config.device_cfg; 1730 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1731 CP210X_GPIO_MODE_MASK) >> 1732 CP210X_GPIO_MODE_OFFSET); 1733 gpio_latch = (u8)((le16_to_cpu(config.reset_state) & 1734 CP210X_GPIO_MODE_MASK) >> 1735 CP210X_GPIO_MODE_OFFSET); 1736 1737 /* mark all pins which are not in GPIO mode */ 1738 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */ 1739 priv->gpio_altfunc |= BIT(0); 1740 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */ 1741 priv->gpio_altfunc |= BIT(1); 1742 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */ 1743 priv->gpio_altfunc |= BIT(2); 1744 1745 /* 1746 * Like CP2102N, CP2104 has also no strict input and output pin 1747 * modes. 1748 * Do the same input mode emulation as CP2102N. 1749 */ 1750 for (i = 0; i < priv->gc.ngpio; ++i) { 1751 /* 1752 * Set direction to "input" iff pin is open-drain and reset 1753 * value is 1. 1754 */ 1755 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1756 priv->gpio_input |= BIT(i); 1757 } 1758 1759 return 0; 1760 } 1761 1762 static int cp2108_gpio_init(struct usb_serial *serial) 1763 { 1764 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1765 struct cp210x_quad_port_config config; 1766 u16 gpio_latch; 1767 int result; 1768 u8 i; 1769 1770 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1771 CP210X_GET_PORTCONFIG, &config, 1772 sizeof(config)); 1773 if (result < 0) 1774 return result; 1775 1776 priv->gc.ngpio = 16; 1777 priv->gpio_pushpull = le16_to_cpu(config.reset_state.gpio_mode_pb1); 1778 gpio_latch = le16_to_cpu(config.reset_state.gpio_latch_pb1); 1779 1780 /* 1781 * Mark all pins which are not in GPIO mode. 1782 * 1783 * Refer to table 9.1 "GPIO Mode alternate Functions" in the datasheet: 1784 * https://www.silabs.com/documents/public/data-sheets/cp2108-datasheet.pdf 1785 * 1786 * Alternate functions of GPIO0 to GPIO3 are determine by enhancedfxn_ifc[0] 1787 * and the similarly for the other pins; enhancedfxn_ifc[1]: GPIO4 to GPIO7, 1788 * enhancedfxn_ifc[2]: GPIO8 to GPIO11, enhancedfxn_ifc[3]: GPIO12 to GPIO15. 1789 */ 1790 for (i = 0; i < 4; i++) { 1791 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_TXLED) 1792 priv->gpio_altfunc |= BIT(i * 4); 1793 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RXLED) 1794 priv->gpio_altfunc |= BIT((i * 4) + 1); 1795 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RS485) 1796 priv->gpio_altfunc |= BIT((i * 4) + 2); 1797 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_CLOCK) 1798 priv->gpio_altfunc |= BIT((i * 4) + 3); 1799 } 1800 1801 /* 1802 * Like CP2102N, CP2108 has also no strict input and output pin 1803 * modes. Do the same input mode emulation as CP2102N. 1804 */ 1805 for (i = 0; i < priv->gc.ngpio; ++i) { 1806 /* 1807 * Set direction to "input" iff pin is open-drain and reset 1808 * value is 1. 1809 */ 1810 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1811 priv->gpio_input |= BIT(i); 1812 } 1813 1814 return 0; 1815 } 1816 1817 static int cp2102n_gpioconf_init(struct usb_serial *serial) 1818 { 1819 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1820 const u16 config_size = 0x02a6; 1821 u8 gpio_rst_latch; 1822 u8 config_version; 1823 u8 gpio_pushpull; 1824 u8 *config_buf; 1825 u8 gpio_latch; 1826 u8 gpio_ctrl; 1827 int result; 1828 u8 i; 1829 1830 /* 1831 * Retrieve device configuration from the device. 1832 * The array received contains all customization settings done at the 1833 * factory/manufacturer. Format of the array is documented at the 1834 * time of writing at: 1835 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa 1836 */ 1837 config_buf = kmalloc(config_size, GFP_KERNEL); 1838 if (!config_buf) 1839 return -ENOMEM; 1840 1841 result = cp210x_read_vendor_block(serial, 1842 REQTYPE_DEVICE_TO_HOST, 1843 CP210X_READ_2NCONFIG, 1844 config_buf, 1845 config_size); 1846 if (result < 0) { 1847 kfree(config_buf); 1848 return result; 1849 } 1850 1851 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX]; 1852 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX]; 1853 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX]; 1854 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX]; 1855 1856 kfree(config_buf); 1857 1858 /* Make sure this is a config format we understand. */ 1859 if (config_version != 0x01) 1860 return -ENOTSUPP; 1861 1862 priv->gc.ngpio = 4; 1863 1864 /* 1865 * Get default pin states after reset. Needed so we can determine 1866 * the direction of an open-drain pin. 1867 */ 1868 gpio_latch = (gpio_rst_latch >> 3) & 0x0f; 1869 1870 /* 0 indicates open-drain mode, 1 is push-pull */ 1871 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f; 1872 1873 /* 0 indicates GPIO mode, 1 is alternate function */ 1874 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) { 1875 /* QFN20 is special... */ 1876 if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE) /* GPIO 0 */ 1877 priv->gpio_altfunc |= BIT(0); 1878 if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */ 1879 priv->gpio_altfunc |= BIT(1); 1880 if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */ 1881 priv->gpio_altfunc |= BIT(2); 1882 if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */ 1883 priv->gpio_altfunc |= BIT(3); 1884 } else { 1885 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f; 1886 } 1887 1888 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) { 1889 /* 1890 * For the QFN28 package, GPIO4-6 are controlled by 1891 * the low three bits of the mode/latch fields. 1892 * Contrary to the document linked above, the bits for 1893 * the SUSPEND pins are elsewhere. No alternate 1894 * function is available for these pins. 1895 */ 1896 priv->gc.ngpio = 7; 1897 gpio_latch |= (gpio_rst_latch & 7) << 4; 1898 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4; 1899 } 1900 1901 /* 1902 * The CP2102N does not strictly has input and output pin modes, 1903 * it only knows open-drain and push-pull modes which is set at 1904 * factory. An open-drain pin can function both as an 1905 * input or an output. We emulate input mode for open-drain pins 1906 * by making sure they are not driven low, and we do not allow 1907 * push-pull pins to be set as an input. 1908 */ 1909 for (i = 0; i < priv->gc.ngpio; ++i) { 1910 /* 1911 * Set direction to "input" iff pin is open-drain and reset 1912 * value is 1. 1913 */ 1914 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1915 priv->gpio_input |= BIT(i); 1916 } 1917 1918 return 0; 1919 } 1920 1921 static int cp210x_gpio_init(struct usb_serial *serial) 1922 { 1923 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1924 int result; 1925 1926 switch (priv->partnum) { 1927 case CP210X_PARTNUM_CP2104: 1928 result = cp2104_gpioconf_init(serial); 1929 break; 1930 case CP210X_PARTNUM_CP2105: 1931 result = cp2105_gpioconf_init(serial); 1932 break; 1933 case CP210X_PARTNUM_CP2108: 1934 /* 1935 * The GPIOs are not tied to any specific port so only register 1936 * once for interface 0. 1937 */ 1938 if (cp210x_interface_num(serial) != 0) 1939 return 0; 1940 result = cp2108_gpio_init(serial); 1941 break; 1942 case CP210X_PARTNUM_CP2102N_QFN28: 1943 case CP210X_PARTNUM_CP2102N_QFN24: 1944 case CP210X_PARTNUM_CP2102N_QFN20: 1945 result = cp2102n_gpioconf_init(serial); 1946 break; 1947 default: 1948 return 0; 1949 } 1950 1951 if (result < 0) 1952 return result; 1953 1954 priv->gc.label = "cp210x"; 1955 priv->gc.get_direction = cp210x_gpio_direction_get; 1956 priv->gc.direction_input = cp210x_gpio_direction_input; 1957 priv->gc.direction_output = cp210x_gpio_direction_output; 1958 priv->gc.get = cp210x_gpio_get; 1959 priv->gc.set = cp210x_gpio_set; 1960 priv->gc.set_config = cp210x_gpio_set_config; 1961 priv->gc.init_valid_mask = cp210x_gpio_init_valid_mask; 1962 priv->gc.owner = THIS_MODULE; 1963 priv->gc.parent = &serial->interface->dev; 1964 priv->gc.base = -1; 1965 priv->gc.can_sleep = true; 1966 1967 result = gpiochip_add_data(&priv->gc, serial); 1968 if (!result) 1969 priv->gpio_registered = true; 1970 1971 return result; 1972 } 1973 1974 static void cp210x_gpio_remove(struct usb_serial *serial) 1975 { 1976 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1977 1978 if (priv->gpio_registered) { 1979 gpiochip_remove(&priv->gc); 1980 priv->gpio_registered = false; 1981 } 1982 } 1983 1984 #else 1985 1986 static int cp210x_gpio_init(struct usb_serial *serial) 1987 { 1988 return 0; 1989 } 1990 1991 static void cp210x_gpio_remove(struct usb_serial *serial) 1992 { 1993 /* Nothing to do */ 1994 } 1995 1996 #endif 1997 1998 static int cp210x_port_probe(struct usb_serial_port *port) 1999 { 2000 struct usb_serial *serial = port->serial; 2001 struct cp210x_port_private *port_priv; 2002 2003 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 2004 if (!port_priv) 2005 return -ENOMEM; 2006 2007 port_priv->bInterfaceNumber = cp210x_interface_num(serial); 2008 mutex_init(&port_priv->mutex); 2009 2010 usb_set_serial_port_data(port, port_priv); 2011 2012 return 0; 2013 } 2014 2015 static void cp210x_port_remove(struct usb_serial_port *port) 2016 { 2017 struct cp210x_port_private *port_priv; 2018 2019 port_priv = usb_get_serial_port_data(port); 2020 kfree(port_priv); 2021 } 2022 2023 static void cp210x_init_max_speed(struct usb_serial *serial) 2024 { 2025 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2026 bool use_actual_rate = false; 2027 speed_t min = 300; 2028 speed_t max; 2029 2030 switch (priv->partnum) { 2031 case CP210X_PARTNUM_CP2101: 2032 max = 921600; 2033 break; 2034 case CP210X_PARTNUM_CP2102: 2035 case CP210X_PARTNUM_CP2103: 2036 max = 1000000; 2037 break; 2038 case CP210X_PARTNUM_CP2104: 2039 use_actual_rate = true; 2040 max = 2000000; 2041 break; 2042 case CP210X_PARTNUM_CP2108: 2043 max = 2000000; 2044 break; 2045 case CP210X_PARTNUM_CP2105: 2046 if (cp210x_interface_num(serial) == 0) { 2047 use_actual_rate = true; 2048 max = 2000000; /* ECI */ 2049 } else { 2050 min = 2400; 2051 max = 921600; /* SCI */ 2052 } 2053 break; 2054 case CP210X_PARTNUM_CP2102N_QFN28: 2055 case CP210X_PARTNUM_CP2102N_QFN24: 2056 case CP210X_PARTNUM_CP2102N_QFN20: 2057 use_actual_rate = true; 2058 max = 3000000; 2059 break; 2060 default: 2061 max = 2000000; 2062 break; 2063 } 2064 2065 priv->min_speed = min; 2066 priv->max_speed = max; 2067 priv->use_actual_rate = use_actual_rate; 2068 } 2069 2070 static void cp2102_determine_quirks(struct usb_serial *serial) 2071 { 2072 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2073 u8 *buf; 2074 int ret; 2075 2076 buf = kmalloc(2, GFP_KERNEL); 2077 if (!buf) 2078 return; 2079 /* 2080 * Some (possibly counterfeit) CP2102 do not support event-insertion 2081 * mode and respond differently to malformed vendor requests. 2082 * Specifically, they return one instead of two bytes when sent a 2083 * two-byte part-number request. 2084 */ 2085 ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 2086 CP210X_VENDOR_SPECIFIC, REQTYPE_DEVICE_TO_HOST, 2087 CP210X_GET_PARTNUM, 0, buf, 2, USB_CTRL_GET_TIMEOUT); 2088 if (ret == 1) { 2089 dev_dbg(&serial->interface->dev, 2090 "device does not support event-insertion mode\n"); 2091 priv->no_event_mode = true; 2092 } 2093 2094 kfree(buf); 2095 } 2096 2097 static int cp210x_get_fw_version(struct usb_serial *serial, u16 value) 2098 { 2099 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2100 u8 ver[3]; 2101 int ret; 2102 2103 ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, value, 2104 ver, sizeof(ver)); 2105 if (ret) 2106 return ret; 2107 2108 dev_dbg(&serial->interface->dev, "%s - %d.%d.%d\n", __func__, 2109 ver[0], ver[1], ver[2]); 2110 2111 priv->fw_version = ver[0] << 16 | ver[1] << 8 | ver[2]; 2112 2113 return 0; 2114 } 2115 2116 static void cp210x_determine_type(struct usb_serial *serial) 2117 { 2118 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2119 int ret; 2120 2121 ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 2122 CP210X_GET_PARTNUM, &priv->partnum, 2123 sizeof(priv->partnum)); 2124 if (ret < 0) { 2125 dev_warn(&serial->interface->dev, 2126 "querying part number failed\n"); 2127 priv->partnum = CP210X_PARTNUM_UNKNOWN; 2128 return; 2129 } 2130 2131 dev_dbg(&serial->interface->dev, "partnum = 0x%02x\n", priv->partnum); 2132 2133 switch (priv->partnum) { 2134 case CP210X_PARTNUM_CP2102: 2135 cp2102_determine_quirks(serial); 2136 break; 2137 case CP210X_PARTNUM_CP2105: 2138 case CP210X_PARTNUM_CP2108: 2139 cp210x_get_fw_version(serial, CP210X_GET_FW_VER); 2140 break; 2141 case CP210X_PARTNUM_CP2102N_QFN28: 2142 case CP210X_PARTNUM_CP2102N_QFN24: 2143 case CP210X_PARTNUM_CP2102N_QFN20: 2144 ret = cp210x_get_fw_version(serial, CP210X_GET_FW_VER_2N); 2145 if (ret) 2146 break; 2147 if (priv->fw_version <= 0x10004) 2148 priv->no_flow_control = true; 2149 break; 2150 default: 2151 break; 2152 } 2153 } 2154 2155 static int cp210x_attach(struct usb_serial *serial) 2156 { 2157 int result; 2158 struct cp210x_serial_private *priv; 2159 2160 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 2161 if (!priv) 2162 return -ENOMEM; 2163 2164 usb_set_serial_data(serial, priv); 2165 2166 cp210x_determine_type(serial); 2167 cp210x_init_max_speed(serial); 2168 2169 result = cp210x_gpio_init(serial); 2170 if (result < 0) { 2171 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n", 2172 result); 2173 } 2174 2175 return 0; 2176 } 2177 2178 static void cp210x_disconnect(struct usb_serial *serial) 2179 { 2180 cp210x_gpio_remove(serial); 2181 } 2182 2183 static void cp210x_release(struct usb_serial *serial) 2184 { 2185 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2186 2187 cp210x_gpio_remove(serial); 2188 2189 kfree(priv); 2190 } 2191 2192 module_usb_serial_driver(serial_drivers, id_table); 2193 2194 MODULE_DESCRIPTION(DRIVER_DESC); 2195 MODULE_LICENSE("GPL v2"); 2196