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(0x04BF, 0x1301) }, /* TDK Corporation NC0110013M - Network Controller */ 60 { USB_DEVICE(0x04BF, 0x1303) }, /* TDK Corporation MM0110113M - i3 Micro Module */ 61 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */ 62 { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */ 63 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */ 64 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */ 65 { USB_DEVICE(0x0908, 0x0070) }, /* Siemens SCALANCE LPE-9000 USB Serial Console */ 66 { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */ 67 { USB_DEVICE(0x0988, 0x0578) }, /* Teraoka AD2000 */ 68 { USB_DEVICE(0x0B00, 0x3070) }, /* Ingenico 3070 */ 69 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */ 70 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */ 71 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */ 72 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */ 73 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */ 74 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */ 75 { USB_DEVICE(0x106F, 0x0003) }, /* CPI / Money Controls Bulk Coin Recycler */ 76 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */ 77 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */ 78 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */ 79 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */ 80 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */ 81 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */ 82 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */ 83 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */ 84 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */ 85 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */ 86 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */ 87 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */ 88 { USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */ 89 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */ 90 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */ 91 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */ 92 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */ 93 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */ 94 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */ 95 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */ 96 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */ 97 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */ 98 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */ 99 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */ 100 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */ 101 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */ 102 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */ 103 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */ 104 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */ 105 { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */ 106 { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */ 107 { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */ 108 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */ 109 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */ 110 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */ 111 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */ 112 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */ 113 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */ 114 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */ 115 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */ 116 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */ 117 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */ 118 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */ 119 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */ 120 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */ 121 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */ 122 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */ 123 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */ 124 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */ 125 { USB_DEVICE(0x10C4, 0x82AA) }, /* Silicon Labs IFS-USB-DATACABLE used with Quint UPS */ 126 { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */ 127 { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */ 128 { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */ 129 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */ 130 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */ 131 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */ 132 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */ 133 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */ 134 { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */ 135 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */ 136 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ 137 { USB_DEVICE(0x10C4, 0x8414) }, /* Decagon USB Cable Adapter */ 138 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ 139 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 140 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */ 141 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ 142 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */ 143 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */ 144 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */ 145 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */ 146 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ 147 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ 148 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */ 149 { USB_DEVICE(0x10C4, 0x863C) }, /* MGP Instruments PDS100 */ 150 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 151 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 152 { USB_DEVICE(0x10C4, 0x87ED) }, /* IMST USB-Stick for Smart Meter */ 153 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */ 154 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */ 155 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */ 156 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */ 157 { USB_DEVICE(0x10C4, 0x88D8) }, /* Acuity Brands nLight Air Adapter */ 158 { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */ 159 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */ 160 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */ 161 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */ 162 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */ 163 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */ 164 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */ 165 { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */ 166 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */ 167 { USB_DEVICE(0x10C4, 0x8A5B) }, /* CEL EM3588 ZigBee USB Stick */ 168 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */ 169 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */ 170 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 171 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 172 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */ 173 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 174 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 175 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */ 176 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */ 177 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 178 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 179 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 180 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 181 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 182 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 183 { USB_DEVICE(0x11CA, 0x0212) }, /* Verifone USB to Printer (UART, CP2102) */ 184 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */ 185 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */ 186 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 187 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 188 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */ 189 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */ 190 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */ 191 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 192 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */ 193 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */ 194 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */ 195 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */ 196 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */ 197 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */ 198 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 199 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ 200 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ 201 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ 202 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ 203 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ 204 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ 205 { USB_DEVICE(0x17A8, 0x0011) }, /* Kamstrup 444 MHz RF sniffer */ 206 { USB_DEVICE(0x17A8, 0x0013) }, /* Kamstrup 870 MHz RF sniffer */ 207 { USB_DEVICE(0x17A8, 0x0101) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Int Ant) */ 208 { USB_DEVICE(0x17A8, 0x0102) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Ext Ant) */ 209 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 210 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 211 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 212 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */ 213 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */ 214 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */ 215 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */ 216 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */ 217 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */ 218 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */ 219 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */ 220 { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 M.2 Key E serial interface */ 221 { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 Display serial interface */ 222 { USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */ 223 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */ 224 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */ 225 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */ 226 { USB_DEVICE(0x1B93, 0x1013) }, /* Phoenix Contact UPS Device */ 227 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */ 228 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 229 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */ 230 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 231 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 232 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 233 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 234 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 235 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 236 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 237 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 238 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 239 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 240 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 241 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 242 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 243 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 244 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 245 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 246 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 247 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 248 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 249 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 250 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 251 { USB_DEVICE(0x2184, 0x0030) }, /* GW Instek GDM-834x Digital Multimeter */ 252 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */ 253 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 254 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 255 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 256 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */ 257 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 258 { } /* Terminating Entry */ 259 }; 260 261 MODULE_DEVICE_TABLE(usb, id_table); 262 263 struct cp210x_serial_private { 264 #ifdef CONFIG_GPIOLIB 265 struct gpio_chip gc; 266 bool gpio_registered; 267 u16 gpio_pushpull; 268 u16 gpio_altfunc; 269 u16 gpio_input; 270 #endif 271 u8 partnum; 272 u32 fw_version; 273 speed_t min_speed; 274 speed_t max_speed; 275 bool use_actual_rate; 276 bool no_flow_control; 277 bool no_event_mode; 278 }; 279 280 enum cp210x_event_state { 281 ES_DATA, 282 ES_ESCAPE, 283 ES_LSR, 284 ES_LSR_DATA_0, 285 ES_LSR_DATA_1, 286 ES_MSR 287 }; 288 289 struct cp210x_port_private { 290 u8 bInterfaceNumber; 291 bool event_mode; 292 enum cp210x_event_state event_state; 293 u8 lsr; 294 295 struct mutex mutex; 296 bool crtscts; 297 bool dtr; 298 bool rts; 299 }; 300 301 static struct usb_serial_driver cp210x_device = { 302 .driver = { 303 .owner = THIS_MODULE, 304 .name = "cp210x", 305 }, 306 .id_table = id_table, 307 .num_ports = 1, 308 .bulk_in_size = 256, 309 .bulk_out_size = 256, 310 .open = cp210x_open, 311 .close = cp210x_close, 312 .break_ctl = cp210x_break_ctl, 313 .set_termios = cp210x_set_termios, 314 .tx_empty = cp210x_tx_empty, 315 .throttle = usb_serial_generic_throttle, 316 .unthrottle = usb_serial_generic_unthrottle, 317 .tiocmget = cp210x_tiocmget, 318 .tiocmset = cp210x_tiocmset, 319 .get_icount = usb_serial_generic_get_icount, 320 .attach = cp210x_attach, 321 .disconnect = cp210x_disconnect, 322 .release = cp210x_release, 323 .port_probe = cp210x_port_probe, 324 .port_remove = cp210x_port_remove, 325 .dtr_rts = cp210x_dtr_rts, 326 .process_read_urb = cp210x_process_read_urb, 327 }; 328 329 static struct usb_serial_driver * const serial_drivers[] = { 330 &cp210x_device, NULL 331 }; 332 333 /* Config request types */ 334 #define REQTYPE_HOST_TO_INTERFACE 0x41 335 #define REQTYPE_INTERFACE_TO_HOST 0xc1 336 #define REQTYPE_HOST_TO_DEVICE 0x40 337 #define REQTYPE_DEVICE_TO_HOST 0xc0 338 339 /* Config request codes */ 340 #define CP210X_IFC_ENABLE 0x00 341 #define CP210X_SET_BAUDDIV 0x01 342 #define CP210X_GET_BAUDDIV 0x02 343 #define CP210X_SET_LINE_CTL 0x03 344 #define CP210X_GET_LINE_CTL 0x04 345 #define CP210X_SET_BREAK 0x05 346 #define CP210X_IMM_CHAR 0x06 347 #define CP210X_SET_MHS 0x07 348 #define CP210X_GET_MDMSTS 0x08 349 #define CP210X_SET_XON 0x09 350 #define CP210X_SET_XOFF 0x0A 351 #define CP210X_SET_EVENTMASK 0x0B 352 #define CP210X_GET_EVENTMASK 0x0C 353 #define CP210X_SET_CHAR 0x0D 354 #define CP210X_GET_CHARS 0x0E 355 #define CP210X_GET_PROPS 0x0F 356 #define CP210X_GET_COMM_STATUS 0x10 357 #define CP210X_RESET 0x11 358 #define CP210X_PURGE 0x12 359 #define CP210X_SET_FLOW 0x13 360 #define CP210X_GET_FLOW 0x14 361 #define CP210X_EMBED_EVENTS 0x15 362 #define CP210X_GET_EVENTSTATE 0x16 363 #define CP210X_SET_CHARS 0x19 364 #define CP210X_GET_BAUDRATE 0x1D 365 #define CP210X_SET_BAUDRATE 0x1E 366 #define CP210X_VENDOR_SPECIFIC 0xFF 367 368 /* CP210X_IFC_ENABLE */ 369 #define UART_ENABLE 0x0001 370 #define UART_DISABLE 0x0000 371 372 /* CP210X_(SET|GET)_BAUDDIV */ 373 #define BAUD_RATE_GEN_FREQ 0x384000 374 375 /* CP210X_(SET|GET)_LINE_CTL */ 376 #define BITS_DATA_MASK 0X0f00 377 #define BITS_DATA_5 0X0500 378 #define BITS_DATA_6 0X0600 379 #define BITS_DATA_7 0X0700 380 #define BITS_DATA_8 0X0800 381 #define BITS_DATA_9 0X0900 382 383 #define BITS_PARITY_MASK 0x00f0 384 #define BITS_PARITY_NONE 0x0000 385 #define BITS_PARITY_ODD 0x0010 386 #define BITS_PARITY_EVEN 0x0020 387 #define BITS_PARITY_MARK 0x0030 388 #define BITS_PARITY_SPACE 0x0040 389 390 #define BITS_STOP_MASK 0x000f 391 #define BITS_STOP_1 0x0000 392 #define BITS_STOP_1_5 0x0001 393 #define BITS_STOP_2 0x0002 394 395 /* CP210X_SET_BREAK */ 396 #define BREAK_ON 0x0001 397 #define BREAK_OFF 0x0000 398 399 /* CP210X_(SET_MHS|GET_MDMSTS) */ 400 #define CONTROL_DTR 0x0001 401 #define CONTROL_RTS 0x0002 402 #define CONTROL_CTS 0x0010 403 #define CONTROL_DSR 0x0020 404 #define CONTROL_RING 0x0040 405 #define CONTROL_DCD 0x0080 406 #define CONTROL_WRITE_DTR 0x0100 407 #define CONTROL_WRITE_RTS 0x0200 408 409 /* CP210X_(GET|SET)_CHARS */ 410 struct cp210x_special_chars { 411 u8 bEofChar; 412 u8 bErrorChar; 413 u8 bBreakChar; 414 u8 bEventChar; 415 u8 bXonChar; 416 u8 bXoffChar; 417 }; 418 419 /* CP210X_VENDOR_SPECIFIC values */ 420 #define CP210X_GET_FW_VER 0x000E 421 #define CP210X_READ_2NCONFIG 0x000E 422 #define CP210X_GET_FW_VER_2N 0x0010 423 #define CP210X_READ_LATCH 0x00C2 424 #define CP210X_GET_PARTNUM 0x370B 425 #define CP210X_GET_PORTCONFIG 0x370C 426 #define CP210X_GET_DEVICEMODE 0x3711 427 #define CP210X_WRITE_LATCH 0x37E1 428 429 /* Part number definitions */ 430 #define CP210X_PARTNUM_CP2101 0x01 431 #define CP210X_PARTNUM_CP2102 0x02 432 #define CP210X_PARTNUM_CP2103 0x03 433 #define CP210X_PARTNUM_CP2104 0x04 434 #define CP210X_PARTNUM_CP2105 0x05 435 #define CP210X_PARTNUM_CP2108 0x08 436 #define CP210X_PARTNUM_CP2102N_QFN28 0x20 437 #define CP210X_PARTNUM_CP2102N_QFN24 0x21 438 #define CP210X_PARTNUM_CP2102N_QFN20 0x22 439 #define CP210X_PARTNUM_UNKNOWN 0xFF 440 441 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 442 struct cp210x_comm_status { 443 __le32 ulErrors; 444 __le32 ulHoldReasons; 445 __le32 ulAmountInInQueue; 446 __le32 ulAmountInOutQueue; 447 u8 bEofReceived; 448 u8 bWaitForImmediate; 449 u8 bReserved; 450 } __packed; 451 452 /* 453 * CP210X_PURGE - 16 bits passed in wValue of USB request. 454 * SiLabs app note AN571 gives a strange description of the 4 bits: 455 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 456 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 457 */ 458 #define PURGE_ALL 0x000f 459 460 /* CP210X_EMBED_EVENTS */ 461 #define CP210X_ESCCHAR 0xec 462 463 #define CP210X_LSR_OVERRUN BIT(1) 464 #define CP210X_LSR_PARITY BIT(2) 465 #define CP210X_LSR_FRAME BIT(3) 466 #define CP210X_LSR_BREAK BIT(4) 467 468 469 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */ 470 struct cp210x_flow_ctl { 471 __le32 ulControlHandshake; 472 __le32 ulFlowReplace; 473 __le32 ulXonLimit; 474 __le32 ulXoffLimit; 475 }; 476 477 /* cp210x_flow_ctl::ulControlHandshake */ 478 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0) 479 #define CP210X_SERIAL_DTR_INACTIVE (0 << 0) 480 #define CP210X_SERIAL_DTR_ACTIVE (1 << 0) 481 #define CP210X_SERIAL_DTR_FLOW_CTL (2 << 0) 482 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3) 483 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4) 484 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5) 485 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6) 486 487 /* cp210x_flow_ctl::ulFlowReplace */ 488 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0) 489 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1) 490 #define CP210X_SERIAL_ERROR_CHAR BIT(2) 491 #define CP210X_SERIAL_NULL_STRIPPING BIT(3) 492 #define CP210X_SERIAL_BREAK_CHAR BIT(4) 493 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6) 494 #define CP210X_SERIAL_RTS_INACTIVE (0 << 6) 495 #define CP210X_SERIAL_RTS_ACTIVE (1 << 6) 496 #define CP210X_SERIAL_RTS_FLOW_CTL (2 << 6) 497 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31) 498 499 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */ 500 struct cp210x_pin_mode { 501 u8 eci; 502 u8 sci; 503 }; 504 505 #define CP210X_PIN_MODE_MODEM 0 506 #define CP210X_PIN_MODE_GPIO BIT(0) 507 508 /* 509 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes 510 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes. 511 */ 512 struct cp210x_dual_port_config { 513 __le16 gpio_mode; 514 u8 __pad0[2]; 515 __le16 reset_state; 516 u8 __pad1[4]; 517 __le16 suspend_state; 518 u8 sci_cfg; 519 u8 eci_cfg; 520 u8 device_cfg; 521 } __packed; 522 523 /* 524 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes 525 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes. 526 */ 527 struct cp210x_single_port_config { 528 __le16 gpio_mode; 529 u8 __pad0[2]; 530 __le16 reset_state; 531 u8 __pad1[4]; 532 __le16 suspend_state; 533 u8 device_cfg; 534 } __packed; 535 536 /* GPIO modes */ 537 #define CP210X_SCI_GPIO_MODE_OFFSET 9 538 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9) 539 540 #define CP210X_ECI_GPIO_MODE_OFFSET 2 541 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2) 542 543 #define CP210X_GPIO_MODE_OFFSET 8 544 #define CP210X_GPIO_MODE_MASK GENMASK(11, 8) 545 546 /* CP2105 port configuration values */ 547 #define CP2105_GPIO0_TXLED_MODE BIT(0) 548 #define CP2105_GPIO1_RXLED_MODE BIT(1) 549 #define CP2105_GPIO1_RS485_MODE BIT(2) 550 551 /* CP2104 port configuration values */ 552 #define CP2104_GPIO0_TXLED_MODE BIT(0) 553 #define CP2104_GPIO1_RXLED_MODE BIT(1) 554 #define CP2104_GPIO2_RS485_MODE BIT(2) 555 556 struct cp210x_quad_port_state { 557 __le16 gpio_mode_pb0; 558 __le16 gpio_mode_pb1; 559 __le16 gpio_mode_pb2; 560 __le16 gpio_mode_pb3; 561 __le16 gpio_mode_pb4; 562 563 __le16 gpio_lowpower_pb0; 564 __le16 gpio_lowpower_pb1; 565 __le16 gpio_lowpower_pb2; 566 __le16 gpio_lowpower_pb3; 567 __le16 gpio_lowpower_pb4; 568 569 __le16 gpio_latch_pb0; 570 __le16 gpio_latch_pb1; 571 __le16 gpio_latch_pb2; 572 __le16 gpio_latch_pb3; 573 __le16 gpio_latch_pb4; 574 }; 575 576 /* 577 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0x49 bytes 578 * on a CP2108 chip. 579 * 580 * See https://www.silabs.com/documents/public/application-notes/an978-cp210x-usb-to-uart-api-specification.pdf 581 */ 582 struct cp210x_quad_port_config { 583 struct cp210x_quad_port_state reset_state; 584 struct cp210x_quad_port_state suspend_state; 585 u8 ipdelay_ifc[4]; 586 u8 enhancedfxn_ifc[4]; 587 u8 enhancedfxn_device; 588 u8 extclkfreq[4]; 589 } __packed; 590 591 #define CP2108_EF_IFC_GPIO_TXLED 0x01 592 #define CP2108_EF_IFC_GPIO_RXLED 0x02 593 #define CP2108_EF_IFC_GPIO_RS485 0x04 594 #define CP2108_EF_IFC_GPIO_RS485_LOGIC 0x08 595 #define CP2108_EF_IFC_GPIO_CLOCK 0x10 596 #define CP2108_EF_IFC_DYNAMIC_SUSPEND 0x40 597 598 /* CP2102N configuration array indices */ 599 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2 600 #define CP210X_2NCONFIG_GPIO_MODE_IDX 581 601 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587 602 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600 603 604 /* CP2102N QFN20 port configuration values */ 605 #define CP2102N_QFN20_GPIO2_TXLED_MODE BIT(2) 606 #define CP2102N_QFN20_GPIO3_RXLED_MODE BIT(3) 607 #define CP2102N_QFN20_GPIO1_RS485_MODE BIT(4) 608 #define CP2102N_QFN20_GPIO0_CLK_MODE BIT(6) 609 610 /* 611 * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x02 bytes 612 * for CP2102N, CP2103, CP2104 and CP2105. 613 */ 614 struct cp210x_gpio_write { 615 u8 mask; 616 u8 state; 617 }; 618 619 /* 620 * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x04 bytes 621 * for CP2108. 622 */ 623 struct cp210x_gpio_write16 { 624 __le16 mask; 625 __le16 state; 626 }; 627 628 /* 629 * Helper to get interface number when we only have struct usb_serial. 630 */ 631 static u8 cp210x_interface_num(struct usb_serial *serial) 632 { 633 struct usb_host_interface *cur_altsetting; 634 635 cur_altsetting = serial->interface->cur_altsetting; 636 637 return cur_altsetting->desc.bInterfaceNumber; 638 } 639 640 /* 641 * Reads a variable-sized block of CP210X_ registers, identified by req. 642 * Returns data into buf in native USB byte order. 643 */ 644 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, 645 void *buf, int bufsize) 646 { 647 struct usb_serial *serial = port->serial; 648 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 649 int result; 650 651 652 result = usb_control_msg_recv(serial->dev, 0, req, 653 REQTYPE_INTERFACE_TO_HOST, 0, 654 port_priv->bInterfaceNumber, buf, bufsize, 655 USB_CTRL_SET_TIMEOUT, GFP_KERNEL); 656 if (result) { 657 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", 658 req, bufsize, result); 659 return result; 660 } 661 662 return 0; 663 } 664 665 /* 666 * Reads any 8-bit CP210X_ register identified by req. 667 */ 668 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val) 669 { 670 return cp210x_read_reg_block(port, req, val, sizeof(*val)); 671 } 672 673 /* 674 * Reads a variable-sized vendor block of CP210X_ registers, identified by val. 675 * Returns data into buf in native USB byte order. 676 */ 677 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val, 678 void *buf, int bufsize) 679 { 680 int result; 681 682 result = usb_control_msg_recv(serial->dev, 0, CP210X_VENDOR_SPECIFIC, 683 type, val, cp210x_interface_num(serial), buf, bufsize, 684 USB_CTRL_GET_TIMEOUT, GFP_KERNEL); 685 if (result) { 686 dev_err(&serial->interface->dev, 687 "failed to get vendor val 0x%04x size %d: %d\n", val, 688 bufsize, result); 689 return result; 690 } 691 692 return 0; 693 } 694 695 /* 696 * Writes any 16-bit CP210X_ register (req) whose value is passed 697 * entirely in the wValue field of the USB request. 698 */ 699 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) 700 { 701 struct usb_serial *serial = port->serial; 702 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 703 int result; 704 705 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 706 req, REQTYPE_HOST_TO_INTERFACE, val, 707 port_priv->bInterfaceNumber, NULL, 0, 708 USB_CTRL_SET_TIMEOUT); 709 if (result < 0) { 710 dev_err(&port->dev, "failed set request 0x%x status: %d\n", 711 req, result); 712 } 713 714 return result; 715 } 716 717 /* 718 * Writes a variable-sized block of CP210X_ registers, identified by req. 719 * Data in buf must be in native USB byte order. 720 */ 721 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req, 722 void *buf, int bufsize) 723 { 724 struct usb_serial *serial = port->serial; 725 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 726 int result; 727 728 result = usb_control_msg_send(serial->dev, 0, req, 729 REQTYPE_HOST_TO_INTERFACE, 0, 730 port_priv->bInterfaceNumber, buf, bufsize, 731 USB_CTRL_SET_TIMEOUT, GFP_KERNEL); 732 if (result) { 733 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", 734 req, bufsize, result); 735 return result; 736 } 737 738 return 0; 739 } 740 741 /* 742 * Writes any 32-bit CP210X_ register identified by req. 743 */ 744 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) 745 { 746 __le32 le32_val; 747 748 le32_val = cpu_to_le32(val); 749 750 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); 751 } 752 753 #ifdef CONFIG_GPIOLIB 754 /* 755 * Writes a variable-sized vendor block of CP210X_ registers, identified by val. 756 * Data in buf must be in native USB byte order. 757 */ 758 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type, 759 u16 val, void *buf, int bufsize) 760 { 761 int result; 762 763 result = usb_control_msg_send(serial->dev, 0, CP210X_VENDOR_SPECIFIC, 764 type, val, cp210x_interface_num(serial), buf, bufsize, 765 USB_CTRL_SET_TIMEOUT, GFP_KERNEL); 766 if (result) { 767 dev_err(&serial->interface->dev, 768 "failed to set vendor val 0x%04x size %d: %d\n", val, 769 bufsize, result); 770 return result; 771 } 772 773 return 0; 774 } 775 #endif 776 777 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 778 { 779 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 780 int result; 781 782 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 783 if (result) { 784 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 785 return result; 786 } 787 788 if (tty) 789 cp210x_set_termios(tty, port, NULL); 790 791 result = usb_serial_generic_open(tty, port); 792 if (result) 793 goto err_disable; 794 795 return 0; 796 797 err_disable: 798 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 799 port_priv->event_mode = false; 800 801 return result; 802 } 803 804 static void cp210x_close(struct usb_serial_port *port) 805 { 806 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 807 808 usb_serial_generic_close(port); 809 810 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 811 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 812 813 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 814 815 /* Disabling the interface disables event-insertion mode. */ 816 port_priv->event_mode = false; 817 } 818 819 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag) 820 { 821 if (lsr & CP210X_LSR_BREAK) { 822 port->icount.brk++; 823 *flag = TTY_BREAK; 824 } else if (lsr & CP210X_LSR_PARITY) { 825 port->icount.parity++; 826 *flag = TTY_PARITY; 827 } else if (lsr & CP210X_LSR_FRAME) { 828 port->icount.frame++; 829 *flag = TTY_FRAME; 830 } 831 832 if (lsr & CP210X_LSR_OVERRUN) { 833 port->icount.overrun++; 834 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); 835 } 836 } 837 838 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag) 839 { 840 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 841 842 switch (port_priv->event_state) { 843 case ES_DATA: 844 if (*ch == CP210X_ESCCHAR) { 845 port_priv->event_state = ES_ESCAPE; 846 break; 847 } 848 return false; 849 case ES_ESCAPE: 850 switch (*ch) { 851 case 0: 852 dev_dbg(&port->dev, "%s - escape char\n", __func__); 853 *ch = CP210X_ESCCHAR; 854 port_priv->event_state = ES_DATA; 855 return false; 856 case 1: 857 port_priv->event_state = ES_LSR_DATA_0; 858 break; 859 case 2: 860 port_priv->event_state = ES_LSR; 861 break; 862 case 3: 863 port_priv->event_state = ES_MSR; 864 break; 865 default: 866 dev_err(&port->dev, "malformed event 0x%02x\n", *ch); 867 port_priv->event_state = ES_DATA; 868 break; 869 } 870 break; 871 case ES_LSR_DATA_0: 872 port_priv->lsr = *ch; 873 port_priv->event_state = ES_LSR_DATA_1; 874 break; 875 case ES_LSR_DATA_1: 876 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n", 877 __func__, port_priv->lsr, *ch); 878 cp210x_process_lsr(port, port_priv->lsr, flag); 879 port_priv->event_state = ES_DATA; 880 return false; 881 case ES_LSR: 882 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch); 883 port_priv->lsr = *ch; 884 cp210x_process_lsr(port, port_priv->lsr, flag); 885 port_priv->event_state = ES_DATA; 886 break; 887 case ES_MSR: 888 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch); 889 /* unimplemented */ 890 port_priv->event_state = ES_DATA; 891 break; 892 } 893 894 return true; 895 } 896 897 static void cp210x_process_read_urb(struct urb *urb) 898 { 899 struct usb_serial_port *port = urb->context; 900 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 901 unsigned char *ch = urb->transfer_buffer; 902 char flag; 903 int i; 904 905 if (!urb->actual_length) 906 return; 907 908 if (port_priv->event_mode) { 909 for (i = 0; i < urb->actual_length; i++, ch++) { 910 flag = TTY_NORMAL; 911 912 if (cp210x_process_char(port, ch, &flag)) 913 continue; 914 915 tty_insert_flip_char(&port->port, *ch, flag); 916 } 917 } else { 918 tty_insert_flip_string(&port->port, ch, urb->actual_length); 919 } 920 tty_flip_buffer_push(&port->port); 921 } 922 923 /* 924 * Read how many bytes are waiting in the TX queue. 925 */ 926 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 927 u32 *count) 928 { 929 struct usb_serial *serial = port->serial; 930 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 931 struct cp210x_comm_status sts; 932 int result; 933 934 result = usb_control_msg_recv(serial->dev, 0, CP210X_GET_COMM_STATUS, 935 REQTYPE_INTERFACE_TO_HOST, 0, 936 port_priv->bInterfaceNumber, &sts, sizeof(sts), 937 USB_CTRL_GET_TIMEOUT, GFP_KERNEL); 938 if (result) { 939 dev_err(&port->dev, "failed to get comm status: %d\n", result); 940 return result; 941 } 942 943 *count = le32_to_cpu(sts.ulAmountInOutQueue); 944 945 return 0; 946 } 947 948 static bool cp210x_tx_empty(struct usb_serial_port *port) 949 { 950 int err; 951 u32 count; 952 953 err = cp210x_get_tx_queue_byte_count(port, &count); 954 if (err) 955 return true; 956 957 return !count; 958 } 959 960 struct cp210x_rate { 961 speed_t rate; 962 speed_t high; 963 }; 964 965 static const struct cp210x_rate cp210x_an205_table1[] = { 966 { 300, 300 }, 967 { 600, 600 }, 968 { 1200, 1200 }, 969 { 1800, 1800 }, 970 { 2400, 2400 }, 971 { 4000, 4000 }, 972 { 4800, 4803 }, 973 { 7200, 7207 }, 974 { 9600, 9612 }, 975 { 14400, 14428 }, 976 { 16000, 16062 }, 977 { 19200, 19250 }, 978 { 28800, 28912 }, 979 { 38400, 38601 }, 980 { 51200, 51558 }, 981 { 56000, 56280 }, 982 { 57600, 58053 }, 983 { 64000, 64111 }, 984 { 76800, 77608 }, 985 { 115200, 117028 }, 986 { 128000, 129347 }, 987 { 153600, 156868 }, 988 { 230400, 237832 }, 989 { 250000, 254234 }, 990 { 256000, 273066 }, 991 { 460800, 491520 }, 992 { 500000, 567138 }, 993 { 576000, 670254 }, 994 { 921600, UINT_MAX } 995 }; 996 997 /* 998 * Quantises the baud rate as per AN205 Table 1 999 */ 1000 static speed_t cp210x_get_an205_rate(speed_t baud) 1001 { 1002 int i; 1003 1004 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) { 1005 if (baud <= cp210x_an205_table1[i].high) 1006 break; 1007 } 1008 1009 return cp210x_an205_table1[i].rate; 1010 } 1011 1012 static speed_t cp210x_get_actual_rate(speed_t baud) 1013 { 1014 unsigned int prescale = 1; 1015 unsigned int div; 1016 1017 if (baud <= 365) 1018 prescale = 4; 1019 1020 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud); 1021 baud = 48000000 / (2 * prescale * div); 1022 1023 return baud; 1024 } 1025 1026 /* 1027 * CP2101 supports the following baud rates: 1028 * 1029 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 1030 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 1031 * 1032 * CP2102 and CP2103 support the following additional rates: 1033 * 1034 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 1035 * 576000 1036 * 1037 * The device will map a requested rate to a supported one, but the result 1038 * of requests for rates greater than 1053257 is undefined (see AN205). 1039 * 1040 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 1041 * respectively, with an error less than 1%. The actual rates are determined 1042 * by 1043 * 1044 * div = round(freq / (2 x prescale x request)) 1045 * actual = freq / (2 x prescale x div) 1046 * 1047 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 1048 * or 1 otherwise. 1049 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 1050 * otherwise. 1051 */ 1052 static void cp210x_change_speed(struct tty_struct *tty, 1053 struct usb_serial_port *port, 1054 const struct ktermios *old_termios) 1055 { 1056 struct usb_serial *serial = port->serial; 1057 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1058 u32 baud; 1059 1060 if (tty->termios.c_ospeed == 0) 1061 return; 1062 1063 /* 1064 * This maps the requested rate to the actual rate, a valid rate on 1065 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed]. 1066 */ 1067 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed); 1068 1069 if (priv->use_actual_rate) 1070 baud = cp210x_get_actual_rate(baud); 1071 else if (baud < 1000000) 1072 baud = cp210x_get_an205_rate(baud); 1073 1074 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 1075 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { 1076 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 1077 if (old_termios) 1078 baud = old_termios->c_ospeed; 1079 else 1080 baud = 9600; 1081 } 1082 1083 tty_encode_baud_rate(tty, baud, baud); 1084 } 1085 1086 static void cp210x_enable_event_mode(struct usb_serial_port *port) 1087 { 1088 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1089 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1090 int ret; 1091 1092 if (port_priv->event_mode) 1093 return; 1094 1095 if (priv->no_event_mode) 1096 return; 1097 1098 port_priv->event_state = ES_DATA; 1099 port_priv->event_mode = true; 1100 1101 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR); 1102 if (ret) { 1103 dev_err(&port->dev, "failed to enable events: %d\n", ret); 1104 port_priv->event_mode = false; 1105 } 1106 } 1107 1108 static void cp210x_disable_event_mode(struct usb_serial_port *port) 1109 { 1110 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1111 int ret; 1112 1113 if (!port_priv->event_mode) 1114 return; 1115 1116 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0); 1117 if (ret) { 1118 dev_err(&port->dev, "failed to disable events: %d\n", ret); 1119 return; 1120 } 1121 1122 port_priv->event_mode = false; 1123 } 1124 1125 static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b) 1126 { 1127 bool iflag_change, cc_change; 1128 1129 iflag_change = ((a->c_iflag ^ b->c_iflag) & (INPCK | IXON | IXOFF)); 1130 cc_change = a->c_cc[VSTART] != b->c_cc[VSTART] || 1131 a->c_cc[VSTOP] != b->c_cc[VSTOP]; 1132 1133 return tty_termios_hw_change(a, b) || iflag_change || cc_change; 1134 } 1135 1136 static void cp210x_set_flow_control(struct tty_struct *tty, 1137 struct usb_serial_port *port, 1138 const struct ktermios *old_termios) 1139 { 1140 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1141 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1142 struct cp210x_special_chars chars; 1143 struct cp210x_flow_ctl flow_ctl; 1144 u32 flow_repl; 1145 u32 ctl_hs; 1146 bool crtscts; 1147 int ret; 1148 1149 /* 1150 * Some CP2102N interpret ulXonLimit as ulFlowReplace (erratum 1151 * CP2102N_E104). Report back that flow control is not supported. 1152 */ 1153 if (priv->no_flow_control) { 1154 tty->termios.c_cflag &= ~CRTSCTS; 1155 tty->termios.c_iflag &= ~(IXON | IXOFF); 1156 } 1157 1158 if (tty->termios.c_ospeed != 0 && 1159 old_termios && old_termios->c_ospeed != 0 && 1160 C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) && 1161 I_IXON(tty) == (old_termios->c_iflag & IXON) && 1162 I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) && 1163 START_CHAR(tty) == old_termios->c_cc[VSTART] && 1164 STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) { 1165 return; 1166 } 1167 1168 if (I_IXON(tty) || I_IXOFF(tty)) { 1169 memset(&chars, 0, sizeof(chars)); 1170 1171 chars.bXonChar = START_CHAR(tty); 1172 chars.bXoffChar = STOP_CHAR(tty); 1173 1174 ret = cp210x_write_reg_block(port, CP210X_SET_CHARS, &chars, 1175 sizeof(chars)); 1176 if (ret) { 1177 dev_err(&port->dev, "failed to set special chars: %d\n", 1178 ret); 1179 } 1180 } 1181 1182 mutex_lock(&port_priv->mutex); 1183 1184 if (tty->termios.c_ospeed == 0) { 1185 port_priv->dtr = false; 1186 port_priv->rts = false; 1187 } else if (old_termios && old_termios->c_ospeed == 0) { 1188 port_priv->dtr = true; 1189 port_priv->rts = true; 1190 } 1191 1192 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1193 sizeof(flow_ctl)); 1194 if (ret) 1195 goto out_unlock; 1196 1197 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1198 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1199 1200 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE; 1201 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE; 1202 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY; 1203 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1204 if (port_priv->dtr) 1205 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE; 1206 else 1207 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE; 1208 1209 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1210 if (C_CRTSCTS(tty)) { 1211 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE; 1212 if (port_priv->rts) 1213 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL; 1214 else 1215 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1216 crtscts = true; 1217 } else { 1218 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE; 1219 if (port_priv->rts) 1220 flow_repl |= CP210X_SERIAL_RTS_ACTIVE; 1221 else 1222 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1223 crtscts = false; 1224 } 1225 1226 if (I_IXOFF(tty)) { 1227 flow_repl |= CP210X_SERIAL_AUTO_RECEIVE; 1228 1229 flow_ctl.ulXonLimit = cpu_to_le32(128); 1230 flow_ctl.ulXoffLimit = cpu_to_le32(128); 1231 } else { 1232 flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE; 1233 } 1234 1235 if (I_IXON(tty)) 1236 flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT; 1237 else 1238 flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT; 1239 1240 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__, 1241 ctl_hs, flow_repl); 1242 1243 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1244 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1245 1246 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1247 sizeof(flow_ctl)); 1248 if (ret) 1249 goto out_unlock; 1250 1251 port_priv->crtscts = crtscts; 1252 out_unlock: 1253 mutex_unlock(&port_priv->mutex); 1254 } 1255 1256 static void cp210x_set_termios(struct tty_struct *tty, 1257 struct usb_serial_port *port, 1258 const struct ktermios *old_termios) 1259 { 1260 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1261 u16 bits; 1262 int ret; 1263 1264 if (old_termios && !cp210x_termios_change(&tty->termios, old_termios) && 1265 tty->termios.c_ospeed != 0) 1266 return; 1267 1268 if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed) 1269 cp210x_change_speed(tty, port, old_termios); 1270 1271 /* CP2101 only supports CS8, 1 stop bit and non-stick parity. */ 1272 if (priv->partnum == CP210X_PARTNUM_CP2101) { 1273 tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR); 1274 tty->termios.c_cflag |= CS8; 1275 } 1276 1277 bits = 0; 1278 1279 switch (C_CSIZE(tty)) { 1280 case CS5: 1281 bits |= BITS_DATA_5; 1282 break; 1283 case CS6: 1284 bits |= BITS_DATA_6; 1285 break; 1286 case CS7: 1287 bits |= BITS_DATA_7; 1288 break; 1289 case CS8: 1290 default: 1291 bits |= BITS_DATA_8; 1292 break; 1293 } 1294 1295 if (C_PARENB(tty)) { 1296 if (C_CMSPAR(tty)) { 1297 if (C_PARODD(tty)) 1298 bits |= BITS_PARITY_MARK; 1299 else 1300 bits |= BITS_PARITY_SPACE; 1301 } else { 1302 if (C_PARODD(tty)) 1303 bits |= BITS_PARITY_ODD; 1304 else 1305 bits |= BITS_PARITY_EVEN; 1306 } 1307 } 1308 1309 if (C_CSTOPB(tty)) 1310 bits |= BITS_STOP_2; 1311 else 1312 bits |= BITS_STOP_1; 1313 1314 ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1315 if (ret) 1316 dev_err(&port->dev, "failed to set line control: %d\n", ret); 1317 1318 cp210x_set_flow_control(tty, port, old_termios); 1319 1320 /* 1321 * Enable event-insertion mode only if input parity checking is 1322 * enabled for now. 1323 */ 1324 if (I_INPCK(tty)) 1325 cp210x_enable_event_mode(port); 1326 else 1327 cp210x_disable_event_mode(port); 1328 } 1329 1330 static int cp210x_tiocmset(struct tty_struct *tty, 1331 unsigned int set, unsigned int clear) 1332 { 1333 struct usb_serial_port *port = tty->driver_data; 1334 return cp210x_tiocmset_port(port, set, clear); 1335 } 1336 1337 static int cp210x_tiocmset_port(struct usb_serial_port *port, 1338 unsigned int set, unsigned int clear) 1339 { 1340 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1341 struct cp210x_flow_ctl flow_ctl; 1342 u32 ctl_hs, flow_repl; 1343 u16 control = 0; 1344 int ret; 1345 1346 mutex_lock(&port_priv->mutex); 1347 1348 if (set & TIOCM_RTS) { 1349 port_priv->rts = true; 1350 control |= CONTROL_RTS; 1351 control |= CONTROL_WRITE_RTS; 1352 } 1353 if (set & TIOCM_DTR) { 1354 port_priv->dtr = true; 1355 control |= CONTROL_DTR; 1356 control |= CONTROL_WRITE_DTR; 1357 } 1358 if (clear & TIOCM_RTS) { 1359 port_priv->rts = false; 1360 control &= ~CONTROL_RTS; 1361 control |= CONTROL_WRITE_RTS; 1362 } 1363 if (clear & TIOCM_DTR) { 1364 port_priv->dtr = false; 1365 control &= ~CONTROL_DTR; 1366 control |= CONTROL_WRITE_DTR; 1367 } 1368 1369 /* 1370 * Use SET_FLOW to set DTR and enable/disable auto-RTS when hardware 1371 * flow control is enabled. 1372 */ 1373 if (port_priv->crtscts && control & CONTROL_WRITE_RTS) { 1374 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1375 sizeof(flow_ctl)); 1376 if (ret) 1377 goto out_unlock; 1378 1379 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1380 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1381 1382 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1383 if (port_priv->dtr) 1384 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE; 1385 else 1386 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE; 1387 1388 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1389 if (port_priv->rts) 1390 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL; 1391 else 1392 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1393 1394 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1395 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1396 1397 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", 1398 __func__, ctl_hs, flow_repl); 1399 1400 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1401 sizeof(flow_ctl)); 1402 } else { 1403 dev_dbg(&port->dev, "%s - control = 0x%04x\n", __func__, control); 1404 1405 ret = cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1406 } 1407 out_unlock: 1408 mutex_unlock(&port_priv->mutex); 1409 1410 return ret; 1411 } 1412 1413 static void cp210x_dtr_rts(struct usb_serial_port *port, int on) 1414 { 1415 if (on) 1416 cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0); 1417 else 1418 cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS); 1419 } 1420 1421 static int cp210x_tiocmget(struct tty_struct *tty) 1422 { 1423 struct usb_serial_port *port = tty->driver_data; 1424 u8 control; 1425 int result; 1426 1427 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1428 if (result) 1429 return result; 1430 1431 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1432 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1433 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1434 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1435 |((control & CONTROL_RING)? TIOCM_RI : 0) 1436 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1437 1438 dev_dbg(&port->dev, "%s - control = 0x%02x\n", __func__, control); 1439 1440 return result; 1441 } 1442 1443 static int cp210x_break_ctl(struct tty_struct *tty, int break_state) 1444 { 1445 struct usb_serial_port *port = tty->driver_data; 1446 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1447 u16 state; 1448 1449 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1450 if (cp210x_interface_num(port->serial) == 1) 1451 return -ENOTTY; 1452 } 1453 1454 if (break_state == 0) 1455 state = BREAK_OFF; 1456 else 1457 state = BREAK_ON; 1458 1459 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1460 state == BREAK_OFF ? "off" : "on"); 1461 1462 return cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1463 } 1464 1465 #ifdef CONFIG_GPIOLIB 1466 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio) 1467 { 1468 struct usb_serial *serial = gpiochip_get_data(gc); 1469 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1470 u8 req_type; 1471 u16 mask; 1472 int result; 1473 int len; 1474 1475 result = usb_autopm_get_interface(serial->interface); 1476 if (result) 1477 return result; 1478 1479 switch (priv->partnum) { 1480 case CP210X_PARTNUM_CP2105: 1481 req_type = REQTYPE_INTERFACE_TO_HOST; 1482 len = 1; 1483 break; 1484 case CP210X_PARTNUM_CP2108: 1485 req_type = REQTYPE_INTERFACE_TO_HOST; 1486 len = 2; 1487 break; 1488 default: 1489 req_type = REQTYPE_DEVICE_TO_HOST; 1490 len = 1; 1491 break; 1492 } 1493 1494 mask = 0; 1495 result = cp210x_read_vendor_block(serial, req_type, CP210X_READ_LATCH, 1496 &mask, len); 1497 1498 usb_autopm_put_interface(serial->interface); 1499 1500 if (result < 0) 1501 return result; 1502 1503 le16_to_cpus(&mask); 1504 1505 return !!(mask & BIT(gpio)); 1506 } 1507 1508 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value) 1509 { 1510 struct usb_serial *serial = gpiochip_get_data(gc); 1511 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1512 struct cp210x_gpio_write16 buf16; 1513 struct cp210x_gpio_write buf; 1514 u16 mask, state; 1515 u16 wIndex; 1516 int result; 1517 1518 if (value == 1) 1519 state = BIT(gpio); 1520 else 1521 state = 0; 1522 1523 mask = BIT(gpio); 1524 1525 result = usb_autopm_get_interface(serial->interface); 1526 if (result) 1527 goto out; 1528 1529 switch (priv->partnum) { 1530 case CP210X_PARTNUM_CP2105: 1531 buf.mask = (u8)mask; 1532 buf.state = (u8)state; 1533 result = cp210x_write_vendor_block(serial, 1534 REQTYPE_HOST_TO_INTERFACE, 1535 CP210X_WRITE_LATCH, &buf, 1536 sizeof(buf)); 1537 break; 1538 case CP210X_PARTNUM_CP2108: 1539 buf16.mask = cpu_to_le16(mask); 1540 buf16.state = cpu_to_le16(state); 1541 result = cp210x_write_vendor_block(serial, 1542 REQTYPE_HOST_TO_INTERFACE, 1543 CP210X_WRITE_LATCH, &buf16, 1544 sizeof(buf16)); 1545 break; 1546 default: 1547 wIndex = state << 8 | mask; 1548 result = usb_control_msg(serial->dev, 1549 usb_sndctrlpipe(serial->dev, 0), 1550 CP210X_VENDOR_SPECIFIC, 1551 REQTYPE_HOST_TO_DEVICE, 1552 CP210X_WRITE_LATCH, 1553 wIndex, 1554 NULL, 0, USB_CTRL_SET_TIMEOUT); 1555 break; 1556 } 1557 1558 usb_autopm_put_interface(serial->interface); 1559 out: 1560 if (result < 0) { 1561 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n", 1562 result); 1563 } 1564 } 1565 1566 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio) 1567 { 1568 struct usb_serial *serial = gpiochip_get_data(gc); 1569 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1570 1571 return priv->gpio_input & BIT(gpio); 1572 } 1573 1574 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio) 1575 { 1576 struct usb_serial *serial = gpiochip_get_data(gc); 1577 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1578 1579 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1580 /* hardware does not support an input mode */ 1581 return -ENOTSUPP; 1582 } 1583 1584 /* push-pull pins cannot be changed to be inputs */ 1585 if (priv->gpio_pushpull & BIT(gpio)) 1586 return -EINVAL; 1587 1588 /* make sure to release pin if it is being driven low */ 1589 cp210x_gpio_set(gc, gpio, 1); 1590 1591 priv->gpio_input |= BIT(gpio); 1592 1593 return 0; 1594 } 1595 1596 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio, 1597 int value) 1598 { 1599 struct usb_serial *serial = gpiochip_get_data(gc); 1600 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1601 1602 priv->gpio_input &= ~BIT(gpio); 1603 cp210x_gpio_set(gc, gpio, value); 1604 1605 return 0; 1606 } 1607 1608 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio, 1609 unsigned long config) 1610 { 1611 struct usb_serial *serial = gpiochip_get_data(gc); 1612 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1613 enum pin_config_param param = pinconf_to_config_param(config); 1614 1615 /* Succeed only if in correct mode (this can't be set at runtime) */ 1616 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) && 1617 (priv->gpio_pushpull & BIT(gpio))) 1618 return 0; 1619 1620 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) && 1621 !(priv->gpio_pushpull & BIT(gpio))) 1622 return 0; 1623 1624 return -ENOTSUPP; 1625 } 1626 1627 static int cp210x_gpio_init_valid_mask(struct gpio_chip *gc, 1628 unsigned long *valid_mask, unsigned int ngpios) 1629 { 1630 struct usb_serial *serial = gpiochip_get_data(gc); 1631 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1632 struct device *dev = &serial->interface->dev; 1633 unsigned long altfunc_mask = priv->gpio_altfunc; 1634 1635 bitmap_complement(valid_mask, &altfunc_mask, ngpios); 1636 1637 if (bitmap_empty(valid_mask, ngpios)) 1638 dev_dbg(dev, "no pin configured for GPIO\n"); 1639 else 1640 dev_dbg(dev, "GPIO.%*pbl configured for GPIO\n", ngpios, 1641 valid_mask); 1642 return 0; 1643 } 1644 1645 /* 1646 * This function is for configuring GPIO using shared pins, where other signals 1647 * are made unavailable by configuring the use of GPIO. This is believed to be 1648 * only applicable to the cp2105 at this point, the other devices supported by 1649 * this driver that provide GPIO do so in a way that does not impact other 1650 * signals and are thus expected to have very different initialisation. 1651 */ 1652 static int cp2105_gpioconf_init(struct usb_serial *serial) 1653 { 1654 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1655 struct cp210x_pin_mode mode; 1656 struct cp210x_dual_port_config config; 1657 u8 intf_num = cp210x_interface_num(serial); 1658 u8 iface_config; 1659 int result; 1660 1661 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1662 CP210X_GET_DEVICEMODE, &mode, 1663 sizeof(mode)); 1664 if (result < 0) 1665 return result; 1666 1667 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1668 CP210X_GET_PORTCONFIG, &config, 1669 sizeof(config)); 1670 if (result < 0) 1671 return result; 1672 1673 /* 2 banks of GPIO - One for the pins taken from each serial port */ 1674 if (intf_num == 0) { 1675 priv->gc.ngpio = 2; 1676 1677 if (mode.eci == CP210X_PIN_MODE_MODEM) { 1678 /* mark all GPIOs of this interface as reserved */ 1679 priv->gpio_altfunc = 0xff; 1680 return 0; 1681 } 1682 1683 iface_config = config.eci_cfg; 1684 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1685 CP210X_ECI_GPIO_MODE_MASK) >> 1686 CP210X_ECI_GPIO_MODE_OFFSET); 1687 } else if (intf_num == 1) { 1688 priv->gc.ngpio = 3; 1689 1690 if (mode.sci == CP210X_PIN_MODE_MODEM) { 1691 /* mark all GPIOs of this interface as reserved */ 1692 priv->gpio_altfunc = 0xff; 1693 return 0; 1694 } 1695 1696 iface_config = config.sci_cfg; 1697 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1698 CP210X_SCI_GPIO_MODE_MASK) >> 1699 CP210X_SCI_GPIO_MODE_OFFSET); 1700 } else { 1701 return -ENODEV; 1702 } 1703 1704 /* mark all pins which are not in GPIO mode */ 1705 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */ 1706 priv->gpio_altfunc |= BIT(0); 1707 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */ 1708 CP2105_GPIO1_RS485_MODE)) 1709 priv->gpio_altfunc |= BIT(1); 1710 1711 /* driver implementation for CP2105 only supports outputs */ 1712 priv->gpio_input = 0; 1713 1714 return 0; 1715 } 1716 1717 static int cp2104_gpioconf_init(struct usb_serial *serial) 1718 { 1719 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1720 struct cp210x_single_port_config config; 1721 u8 iface_config; 1722 u8 gpio_latch; 1723 int result; 1724 u8 i; 1725 1726 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1727 CP210X_GET_PORTCONFIG, &config, 1728 sizeof(config)); 1729 if (result < 0) 1730 return result; 1731 1732 priv->gc.ngpio = 4; 1733 1734 iface_config = config.device_cfg; 1735 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1736 CP210X_GPIO_MODE_MASK) >> 1737 CP210X_GPIO_MODE_OFFSET); 1738 gpio_latch = (u8)((le16_to_cpu(config.reset_state) & 1739 CP210X_GPIO_MODE_MASK) >> 1740 CP210X_GPIO_MODE_OFFSET); 1741 1742 /* mark all pins which are not in GPIO mode */ 1743 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */ 1744 priv->gpio_altfunc |= BIT(0); 1745 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */ 1746 priv->gpio_altfunc |= BIT(1); 1747 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */ 1748 priv->gpio_altfunc |= BIT(2); 1749 1750 /* 1751 * Like CP2102N, CP2104 has also no strict input and output pin 1752 * modes. 1753 * Do the same input mode emulation as CP2102N. 1754 */ 1755 for (i = 0; i < priv->gc.ngpio; ++i) { 1756 /* 1757 * Set direction to "input" iff pin is open-drain and reset 1758 * value is 1. 1759 */ 1760 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1761 priv->gpio_input |= BIT(i); 1762 } 1763 1764 return 0; 1765 } 1766 1767 static int cp2108_gpio_init(struct usb_serial *serial) 1768 { 1769 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1770 struct cp210x_quad_port_config config; 1771 u16 gpio_latch; 1772 int result; 1773 u8 i; 1774 1775 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1776 CP210X_GET_PORTCONFIG, &config, 1777 sizeof(config)); 1778 if (result < 0) 1779 return result; 1780 1781 priv->gc.ngpio = 16; 1782 priv->gpio_pushpull = le16_to_cpu(config.reset_state.gpio_mode_pb1); 1783 gpio_latch = le16_to_cpu(config.reset_state.gpio_latch_pb1); 1784 1785 /* 1786 * Mark all pins which are not in GPIO mode. 1787 * 1788 * Refer to table 9.1 "GPIO Mode alternate Functions" in the datasheet: 1789 * https://www.silabs.com/documents/public/data-sheets/cp2108-datasheet.pdf 1790 * 1791 * Alternate functions of GPIO0 to GPIO3 are determine by enhancedfxn_ifc[0] 1792 * and the similarly for the other pins; enhancedfxn_ifc[1]: GPIO4 to GPIO7, 1793 * enhancedfxn_ifc[2]: GPIO8 to GPIO11, enhancedfxn_ifc[3]: GPIO12 to GPIO15. 1794 */ 1795 for (i = 0; i < 4; i++) { 1796 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_TXLED) 1797 priv->gpio_altfunc |= BIT(i * 4); 1798 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RXLED) 1799 priv->gpio_altfunc |= BIT((i * 4) + 1); 1800 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RS485) 1801 priv->gpio_altfunc |= BIT((i * 4) + 2); 1802 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_CLOCK) 1803 priv->gpio_altfunc |= BIT((i * 4) + 3); 1804 } 1805 1806 /* 1807 * Like CP2102N, CP2108 has also no strict input and output pin 1808 * modes. Do the same input mode emulation as CP2102N. 1809 */ 1810 for (i = 0; i < priv->gc.ngpio; ++i) { 1811 /* 1812 * Set direction to "input" iff pin is open-drain and reset 1813 * value is 1. 1814 */ 1815 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1816 priv->gpio_input |= BIT(i); 1817 } 1818 1819 return 0; 1820 } 1821 1822 static int cp2102n_gpioconf_init(struct usb_serial *serial) 1823 { 1824 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1825 const u16 config_size = 0x02a6; 1826 u8 gpio_rst_latch; 1827 u8 config_version; 1828 u8 gpio_pushpull; 1829 u8 *config_buf; 1830 u8 gpio_latch; 1831 u8 gpio_ctrl; 1832 int result; 1833 u8 i; 1834 1835 /* 1836 * Retrieve device configuration from the device. 1837 * The array received contains all customization settings done at the 1838 * factory/manufacturer. Format of the array is documented at the 1839 * time of writing at: 1840 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa 1841 */ 1842 config_buf = kmalloc(config_size, GFP_KERNEL); 1843 if (!config_buf) 1844 return -ENOMEM; 1845 1846 result = cp210x_read_vendor_block(serial, 1847 REQTYPE_DEVICE_TO_HOST, 1848 CP210X_READ_2NCONFIG, 1849 config_buf, 1850 config_size); 1851 if (result < 0) { 1852 kfree(config_buf); 1853 return result; 1854 } 1855 1856 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX]; 1857 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX]; 1858 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX]; 1859 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX]; 1860 1861 kfree(config_buf); 1862 1863 /* Make sure this is a config format we understand. */ 1864 if (config_version != 0x01) 1865 return -ENOTSUPP; 1866 1867 priv->gc.ngpio = 4; 1868 1869 /* 1870 * Get default pin states after reset. Needed so we can determine 1871 * the direction of an open-drain pin. 1872 */ 1873 gpio_latch = (gpio_rst_latch >> 3) & 0x0f; 1874 1875 /* 0 indicates open-drain mode, 1 is push-pull */ 1876 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f; 1877 1878 /* 0 indicates GPIO mode, 1 is alternate function */ 1879 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) { 1880 /* QFN20 is special... */ 1881 if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE) /* GPIO 0 */ 1882 priv->gpio_altfunc |= BIT(0); 1883 if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */ 1884 priv->gpio_altfunc |= BIT(1); 1885 if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */ 1886 priv->gpio_altfunc |= BIT(2); 1887 if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */ 1888 priv->gpio_altfunc |= BIT(3); 1889 } else { 1890 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f; 1891 } 1892 1893 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) { 1894 /* 1895 * For the QFN28 package, GPIO4-6 are controlled by 1896 * the low three bits of the mode/latch fields. 1897 * Contrary to the document linked above, the bits for 1898 * the SUSPEND pins are elsewhere. No alternate 1899 * function is available for these pins. 1900 */ 1901 priv->gc.ngpio = 7; 1902 gpio_latch |= (gpio_rst_latch & 7) << 4; 1903 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4; 1904 } 1905 1906 /* 1907 * The CP2102N does not strictly has input and output pin modes, 1908 * it only knows open-drain and push-pull modes which is set at 1909 * factory. An open-drain pin can function both as an 1910 * input or an output. We emulate input mode for open-drain pins 1911 * by making sure they are not driven low, and we do not allow 1912 * push-pull pins to be set as an input. 1913 */ 1914 for (i = 0; i < priv->gc.ngpio; ++i) { 1915 /* 1916 * Set direction to "input" iff pin is open-drain and reset 1917 * value is 1. 1918 */ 1919 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1920 priv->gpio_input |= BIT(i); 1921 } 1922 1923 return 0; 1924 } 1925 1926 static int cp210x_gpio_init(struct usb_serial *serial) 1927 { 1928 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1929 int result; 1930 1931 switch (priv->partnum) { 1932 case CP210X_PARTNUM_CP2104: 1933 result = cp2104_gpioconf_init(serial); 1934 break; 1935 case CP210X_PARTNUM_CP2105: 1936 result = cp2105_gpioconf_init(serial); 1937 break; 1938 case CP210X_PARTNUM_CP2108: 1939 /* 1940 * The GPIOs are not tied to any specific port so only register 1941 * once for interface 0. 1942 */ 1943 if (cp210x_interface_num(serial) != 0) 1944 return 0; 1945 result = cp2108_gpio_init(serial); 1946 break; 1947 case CP210X_PARTNUM_CP2102N_QFN28: 1948 case CP210X_PARTNUM_CP2102N_QFN24: 1949 case CP210X_PARTNUM_CP2102N_QFN20: 1950 result = cp2102n_gpioconf_init(serial); 1951 break; 1952 default: 1953 return 0; 1954 } 1955 1956 if (result < 0) 1957 return result; 1958 1959 priv->gc.label = "cp210x"; 1960 priv->gc.get_direction = cp210x_gpio_direction_get; 1961 priv->gc.direction_input = cp210x_gpio_direction_input; 1962 priv->gc.direction_output = cp210x_gpio_direction_output; 1963 priv->gc.get = cp210x_gpio_get; 1964 priv->gc.set = cp210x_gpio_set; 1965 priv->gc.set_config = cp210x_gpio_set_config; 1966 priv->gc.init_valid_mask = cp210x_gpio_init_valid_mask; 1967 priv->gc.owner = THIS_MODULE; 1968 priv->gc.parent = &serial->interface->dev; 1969 priv->gc.base = -1; 1970 priv->gc.can_sleep = true; 1971 1972 result = gpiochip_add_data(&priv->gc, serial); 1973 if (!result) 1974 priv->gpio_registered = true; 1975 1976 return result; 1977 } 1978 1979 static void cp210x_gpio_remove(struct usb_serial *serial) 1980 { 1981 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1982 1983 if (priv->gpio_registered) { 1984 gpiochip_remove(&priv->gc); 1985 priv->gpio_registered = false; 1986 } 1987 } 1988 1989 #else 1990 1991 static int cp210x_gpio_init(struct usb_serial *serial) 1992 { 1993 return 0; 1994 } 1995 1996 static void cp210x_gpio_remove(struct usb_serial *serial) 1997 { 1998 /* Nothing to do */ 1999 } 2000 2001 #endif 2002 2003 static int cp210x_port_probe(struct usb_serial_port *port) 2004 { 2005 struct usb_serial *serial = port->serial; 2006 struct cp210x_port_private *port_priv; 2007 2008 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 2009 if (!port_priv) 2010 return -ENOMEM; 2011 2012 port_priv->bInterfaceNumber = cp210x_interface_num(serial); 2013 mutex_init(&port_priv->mutex); 2014 2015 usb_set_serial_port_data(port, port_priv); 2016 2017 return 0; 2018 } 2019 2020 static void cp210x_port_remove(struct usb_serial_port *port) 2021 { 2022 struct cp210x_port_private *port_priv; 2023 2024 port_priv = usb_get_serial_port_data(port); 2025 kfree(port_priv); 2026 } 2027 2028 static void cp210x_init_max_speed(struct usb_serial *serial) 2029 { 2030 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2031 bool use_actual_rate = false; 2032 speed_t min = 300; 2033 speed_t max; 2034 2035 switch (priv->partnum) { 2036 case CP210X_PARTNUM_CP2101: 2037 max = 921600; 2038 break; 2039 case CP210X_PARTNUM_CP2102: 2040 case CP210X_PARTNUM_CP2103: 2041 max = 1000000; 2042 break; 2043 case CP210X_PARTNUM_CP2104: 2044 use_actual_rate = true; 2045 max = 2000000; 2046 break; 2047 case CP210X_PARTNUM_CP2108: 2048 max = 2000000; 2049 break; 2050 case CP210X_PARTNUM_CP2105: 2051 if (cp210x_interface_num(serial) == 0) { 2052 use_actual_rate = true; 2053 max = 2000000; /* ECI */ 2054 } else { 2055 min = 2400; 2056 max = 921600; /* SCI */ 2057 } 2058 break; 2059 case CP210X_PARTNUM_CP2102N_QFN28: 2060 case CP210X_PARTNUM_CP2102N_QFN24: 2061 case CP210X_PARTNUM_CP2102N_QFN20: 2062 use_actual_rate = true; 2063 max = 3000000; 2064 break; 2065 default: 2066 max = 2000000; 2067 break; 2068 } 2069 2070 priv->min_speed = min; 2071 priv->max_speed = max; 2072 priv->use_actual_rate = use_actual_rate; 2073 } 2074 2075 static void cp2102_determine_quirks(struct usb_serial *serial) 2076 { 2077 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2078 u8 *buf; 2079 int ret; 2080 2081 buf = kmalloc(2, GFP_KERNEL); 2082 if (!buf) 2083 return; 2084 /* 2085 * Some (possibly counterfeit) CP2102 do not support event-insertion 2086 * mode and respond differently to malformed vendor requests. 2087 * Specifically, they return one instead of two bytes when sent a 2088 * two-byte part-number request. 2089 */ 2090 ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 2091 CP210X_VENDOR_SPECIFIC, REQTYPE_DEVICE_TO_HOST, 2092 CP210X_GET_PARTNUM, 0, buf, 2, USB_CTRL_GET_TIMEOUT); 2093 if (ret == 1) { 2094 dev_dbg(&serial->interface->dev, 2095 "device does not support event-insertion mode\n"); 2096 priv->no_event_mode = true; 2097 } 2098 2099 kfree(buf); 2100 } 2101 2102 static int cp210x_get_fw_version(struct usb_serial *serial, u16 value) 2103 { 2104 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2105 u8 ver[3]; 2106 int ret; 2107 2108 ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, value, 2109 ver, sizeof(ver)); 2110 if (ret) 2111 return ret; 2112 2113 dev_dbg(&serial->interface->dev, "%s - %d.%d.%d\n", __func__, 2114 ver[0], ver[1], ver[2]); 2115 2116 priv->fw_version = ver[0] << 16 | ver[1] << 8 | ver[2]; 2117 2118 return 0; 2119 } 2120 2121 static void cp210x_determine_type(struct usb_serial *serial) 2122 { 2123 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2124 int ret; 2125 2126 ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 2127 CP210X_GET_PARTNUM, &priv->partnum, 2128 sizeof(priv->partnum)); 2129 if (ret < 0) { 2130 dev_warn(&serial->interface->dev, 2131 "querying part number failed\n"); 2132 priv->partnum = CP210X_PARTNUM_UNKNOWN; 2133 return; 2134 } 2135 2136 dev_dbg(&serial->interface->dev, "partnum = 0x%02x\n", priv->partnum); 2137 2138 switch (priv->partnum) { 2139 case CP210X_PARTNUM_CP2102: 2140 cp2102_determine_quirks(serial); 2141 break; 2142 case CP210X_PARTNUM_CP2105: 2143 case CP210X_PARTNUM_CP2108: 2144 cp210x_get_fw_version(serial, CP210X_GET_FW_VER); 2145 break; 2146 case CP210X_PARTNUM_CP2102N_QFN28: 2147 case CP210X_PARTNUM_CP2102N_QFN24: 2148 case CP210X_PARTNUM_CP2102N_QFN20: 2149 ret = cp210x_get_fw_version(serial, CP210X_GET_FW_VER_2N); 2150 if (ret) 2151 break; 2152 if (priv->fw_version <= 0x10004) 2153 priv->no_flow_control = true; 2154 break; 2155 default: 2156 break; 2157 } 2158 } 2159 2160 static int cp210x_attach(struct usb_serial *serial) 2161 { 2162 int result; 2163 struct cp210x_serial_private *priv; 2164 2165 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 2166 if (!priv) 2167 return -ENOMEM; 2168 2169 usb_set_serial_data(serial, priv); 2170 2171 cp210x_determine_type(serial); 2172 cp210x_init_max_speed(serial); 2173 2174 result = cp210x_gpio_init(serial); 2175 if (result < 0) { 2176 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n", 2177 result); 2178 } 2179 2180 return 0; 2181 } 2182 2183 static void cp210x_disconnect(struct usb_serial *serial) 2184 { 2185 cp210x_gpio_remove(serial); 2186 } 2187 2188 static void cp210x_release(struct usb_serial *serial) 2189 { 2190 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2191 2192 cp210x_gpio_remove(serial); 2193 2194 kfree(priv); 2195 } 2196 2197 module_usb_serial_driver(serial_drivers, id_table); 2198 2199 MODULE_DESCRIPTION(DRIVER_DESC); 2200 MODULE_LICENSE("GPL v2"); 2201