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