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 */ 31static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *); 32static void cp210x_close(struct usb_serial_port *); 33static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *, 34 const struct ktermios *); 35static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *, 36 const struct ktermios *); 37static bool cp210x_tx_empty(struct usb_serial_port *port); 38static int cp210x_tiocmget(struct tty_struct *); 39static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int); 40static int cp210x_tiocmset_port(struct usb_serial_port *port, 41 unsigned int, unsigned int); 42static int cp210x_break_ctl(struct tty_struct *, int); 43static int cp210x_attach(struct usb_serial *); 44static void cp210x_disconnect(struct usb_serial *); 45static void cp210x_release(struct usb_serial *); 46static int cp210x_port_probe(struct usb_serial_port *); 47static void cp210x_port_remove(struct usb_serial_port *); 48static void cp210x_dtr_rts(struct usb_serial_port *port, int on); 49static void cp210x_process_read_urb(struct urb *urb); 50static void cp210x_enable_event_mode(struct usb_serial_port *port); 51static void cp210x_disable_event_mode(struct usb_serial_port *port); 52 53static 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 260MODULE_DEVICE_TABLE(usb, id_table); 261 262struct 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 279enum 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 288struct 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 300static struct usb_serial_driver cp210x_device = { 301 .driver = { 302 .owner = THIS_MODULE, 303 .name = "cp210x", 304 }, 305 .id_table = id_table, 306 .num_ports = 1, 307 .bulk_in_size = 256, 308 .bulk_out_size = 256, 309 .open = cp210x_open, 310 .close = cp210x_close, 311 .break_ctl = cp210x_break_ctl, 312 .set_termios = cp210x_set_termios, 313 .tx_empty = cp210x_tx_empty, 314 .throttle = usb_serial_generic_throttle, 315 .unthrottle = usb_serial_generic_unthrottle, 316 .tiocmget = cp210x_tiocmget, 317 .tiocmset = cp210x_tiocmset, 318 .get_icount = usb_serial_generic_get_icount, 319 .attach = cp210x_attach, 320 .disconnect = cp210x_disconnect, 321 .release = cp210x_release, 322 .port_probe = cp210x_port_probe, 323 .port_remove = cp210x_port_remove, 324 .dtr_rts = cp210x_dtr_rts, 325 .process_read_urb = cp210x_process_read_urb, 326}; 327 328static struct usb_serial_driver * const serial_drivers[] = { 329 &cp210x_device, NULL 330}; 331 332/* Config request types */ 333#define REQTYPE_HOST_TO_INTERFACE 0x41 334#define REQTYPE_INTERFACE_TO_HOST 0xc1 335#define REQTYPE_HOST_TO_DEVICE 0x40 336#define REQTYPE_DEVICE_TO_HOST 0xc0 337 338/* Config request codes */ 339#define CP210X_IFC_ENABLE 0x00 340#define CP210X_SET_BAUDDIV 0x01 341#define CP210X_GET_BAUDDIV 0x02 342#define CP210X_SET_LINE_CTL 0x03 343#define CP210X_GET_LINE_CTL 0x04 344#define CP210X_SET_BREAK 0x05 345#define CP210X_IMM_CHAR 0x06 346#define CP210X_SET_MHS 0x07 347#define CP210X_GET_MDMSTS 0x08 348#define CP210X_SET_XON 0x09 349#define CP210X_SET_XOFF 0x0A 350#define CP210X_SET_EVENTMASK 0x0B 351#define CP210X_GET_EVENTMASK 0x0C 352#define CP210X_SET_CHAR 0x0D 353#define CP210X_GET_CHARS 0x0E 354#define CP210X_GET_PROPS 0x0F 355#define CP210X_GET_COMM_STATUS 0x10 356#define CP210X_RESET 0x11 357#define CP210X_PURGE 0x12 358#define CP210X_SET_FLOW 0x13 359#define CP210X_GET_FLOW 0x14 360#define CP210X_EMBED_EVENTS 0x15 361#define CP210X_GET_EVENTSTATE 0x16 362#define CP210X_SET_CHARS 0x19 363#define CP210X_GET_BAUDRATE 0x1D 364#define CP210X_SET_BAUDRATE 0x1E 365#define CP210X_VENDOR_SPECIFIC 0xFF 366 367/* CP210X_IFC_ENABLE */ 368#define UART_ENABLE 0x0001 369#define UART_DISABLE 0x0000 370 371/* CP210X_(SET|GET)_BAUDDIV */ 372#define BAUD_RATE_GEN_FREQ 0x384000 373 374/* CP210X_(SET|GET)_LINE_CTL */ 375#define BITS_DATA_MASK 0X0f00 376#define BITS_DATA_5 0X0500 377#define BITS_DATA_6 0X0600 378#define BITS_DATA_7 0X0700 379#define BITS_DATA_8 0X0800 380#define BITS_DATA_9 0X0900 381 382#define BITS_PARITY_MASK 0x00f0 383#define BITS_PARITY_NONE 0x0000 384#define BITS_PARITY_ODD 0x0010 385#define BITS_PARITY_EVEN 0x0020 386#define BITS_PARITY_MARK 0x0030 387#define BITS_PARITY_SPACE 0x0040 388 389#define BITS_STOP_MASK 0x000f 390#define BITS_STOP_1 0x0000 391#define BITS_STOP_1_5 0x0001 392#define BITS_STOP_2 0x0002 393 394/* CP210X_SET_BREAK */ 395#define BREAK_ON 0x0001 396#define BREAK_OFF 0x0000 397 398/* CP210X_(SET_MHS|GET_MDMSTS) */ 399#define CONTROL_DTR 0x0001 400#define CONTROL_RTS 0x0002 401#define CONTROL_CTS 0x0010 402#define CONTROL_DSR 0x0020 403#define CONTROL_RING 0x0040 404#define CONTROL_DCD 0x0080 405#define CONTROL_WRITE_DTR 0x0100 406#define CONTROL_WRITE_RTS 0x0200 407 408/* CP210X_(GET|SET)_CHARS */ 409struct cp210x_special_chars { 410 u8 bEofChar; 411 u8 bErrorChar; 412 u8 bBreakChar; 413 u8 bEventChar; 414 u8 bXonChar; 415 u8 bXoffChar; 416}; 417 418/* CP210X_VENDOR_SPECIFIC values */ 419#define CP210X_GET_FW_VER 0x000E 420#define CP210X_READ_2NCONFIG 0x000E 421#define CP210X_GET_FW_VER_2N 0x0010 422#define CP210X_READ_LATCH 0x00C2 423#define CP210X_GET_PARTNUM 0x370B 424#define CP210X_GET_PORTCONFIG 0x370C 425#define CP210X_GET_DEVICEMODE 0x3711 426#define CP210X_WRITE_LATCH 0x37E1 427 428/* Part number definitions */ 429#define CP210X_PARTNUM_CP2101 0x01 430#define CP210X_PARTNUM_CP2102 0x02 431#define CP210X_PARTNUM_CP2103 0x03 432#define CP210X_PARTNUM_CP2104 0x04 433#define CP210X_PARTNUM_CP2105 0x05 434#define CP210X_PARTNUM_CP2108 0x08 435#define CP210X_PARTNUM_CP2102N_QFN28 0x20 436#define CP210X_PARTNUM_CP2102N_QFN24 0x21 437#define CP210X_PARTNUM_CP2102N_QFN20 0x22 438#define CP210X_PARTNUM_UNKNOWN 0xFF 439 440/* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 441struct cp210x_comm_status { 442 __le32 ulErrors; 443 __le32 ulHoldReasons; 444 __le32 ulAmountInInQueue; 445 __le32 ulAmountInOutQueue; 446 u8 bEofReceived; 447 u8 bWaitForImmediate; 448 u8 bReserved; 449} __packed; 450 451/* 452 * CP210X_PURGE - 16 bits passed in wValue of USB request. 453 * SiLabs app note AN571 gives a strange description of the 4 bits: 454 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 455 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 456 */ 457#define PURGE_ALL 0x000f 458 459/* CP210X_EMBED_EVENTS */ 460#define CP210X_ESCCHAR 0xec 461 462#define CP210X_LSR_OVERRUN BIT(1) 463#define CP210X_LSR_PARITY BIT(2) 464#define CP210X_LSR_FRAME BIT(3) 465#define CP210X_LSR_BREAK BIT(4) 466 467 468/* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */ 469struct cp210x_flow_ctl { 470 __le32 ulControlHandshake; 471 __le32 ulFlowReplace; 472 __le32 ulXonLimit; 473 __le32 ulXoffLimit; 474}; 475 476/* cp210x_flow_ctl::ulControlHandshake */ 477#define CP210X_SERIAL_DTR_MASK GENMASK(1, 0) 478#define CP210X_SERIAL_DTR_INACTIVE (0 << 0) 479#define CP210X_SERIAL_DTR_ACTIVE (1 << 0) 480#define CP210X_SERIAL_DTR_FLOW_CTL (2 << 0) 481#define CP210X_SERIAL_CTS_HANDSHAKE BIT(3) 482#define CP210X_SERIAL_DSR_HANDSHAKE BIT(4) 483#define CP210X_SERIAL_DCD_HANDSHAKE BIT(5) 484#define CP210X_SERIAL_DSR_SENSITIVITY BIT(6) 485 486/* cp210x_flow_ctl::ulFlowReplace */ 487#define CP210X_SERIAL_AUTO_TRANSMIT BIT(0) 488#define CP210X_SERIAL_AUTO_RECEIVE BIT(1) 489#define CP210X_SERIAL_ERROR_CHAR BIT(2) 490#define CP210X_SERIAL_NULL_STRIPPING BIT(3) 491#define CP210X_SERIAL_BREAK_CHAR BIT(4) 492#define CP210X_SERIAL_RTS_MASK GENMASK(7, 6) 493#define CP210X_SERIAL_RTS_INACTIVE (0 << 6) 494#define CP210X_SERIAL_RTS_ACTIVE (1 << 6) 495#define CP210X_SERIAL_RTS_FLOW_CTL (2 << 6) 496#define CP210X_SERIAL_XOFF_CONTINUE BIT(31) 497 498/* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */ 499struct cp210x_pin_mode { 500 u8 eci; 501 u8 sci; 502}; 503 504#define CP210X_PIN_MODE_MODEM 0 505#define CP210X_PIN_MODE_GPIO BIT(0) 506 507/* 508 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes 509 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes. 510 */ 511struct cp210x_dual_port_config { 512 __le16 gpio_mode; 513 u8 __pad0[2]; 514 __le16 reset_state; 515 u8 __pad1[4]; 516 __le16 suspend_state; 517 u8 sci_cfg; 518 u8 eci_cfg; 519 u8 device_cfg; 520} __packed; 521 522/* 523 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes 524 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes. 525 */ 526struct cp210x_single_port_config { 527 __le16 gpio_mode; 528 u8 __pad0[2]; 529 __le16 reset_state; 530 u8 __pad1[4]; 531 __le16 suspend_state; 532 u8 device_cfg; 533} __packed; 534 535/* GPIO modes */ 536#define CP210X_SCI_GPIO_MODE_OFFSET 9 537#define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9) 538 539#define CP210X_ECI_GPIO_MODE_OFFSET 2 540#define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2) 541 542#define CP210X_GPIO_MODE_OFFSET 8 543#define CP210X_GPIO_MODE_MASK GENMASK(11, 8) 544 545/* CP2105 port configuration values */ 546#define CP2105_GPIO0_TXLED_MODE BIT(0) 547#define CP2105_GPIO1_RXLED_MODE BIT(1) 548#define CP2105_GPIO1_RS485_MODE BIT(2) 549 550/* CP2104 port configuration values */ 551#define CP2104_GPIO0_TXLED_MODE BIT(0) 552#define CP2104_GPIO1_RXLED_MODE BIT(1) 553#define CP2104_GPIO2_RS485_MODE BIT(2) 554 555struct cp210x_quad_port_state { 556 __le16 gpio_mode_pb0; 557 __le16 gpio_mode_pb1; 558 __le16 gpio_mode_pb2; 559 __le16 gpio_mode_pb3; 560 __le16 gpio_mode_pb4; 561 562 __le16 gpio_lowpower_pb0; 563 __le16 gpio_lowpower_pb1; 564 __le16 gpio_lowpower_pb2; 565 __le16 gpio_lowpower_pb3; 566 __le16 gpio_lowpower_pb4; 567 568 __le16 gpio_latch_pb0; 569 __le16 gpio_latch_pb1; 570 __le16 gpio_latch_pb2; 571 __le16 gpio_latch_pb3; 572 __le16 gpio_latch_pb4; 573}; 574 575/* 576 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0x49 bytes 577 * on a CP2108 chip. 578 * 579 * See https://www.silabs.com/documents/public/application-notes/an978-cp210x-usb-to-uart-api-specification.pdf 580 */ 581struct cp210x_quad_port_config { 582 struct cp210x_quad_port_state reset_state; 583 struct cp210x_quad_port_state suspend_state; 584 u8 ipdelay_ifc[4]; 585 u8 enhancedfxn_ifc[4]; 586 u8 enhancedfxn_device; 587 u8 extclkfreq[4]; 588} __packed; 589 590#define CP2108_EF_IFC_GPIO_TXLED 0x01 591#define CP2108_EF_IFC_GPIO_RXLED 0x02 592#define CP2108_EF_IFC_GPIO_RS485 0x04 593#define CP2108_EF_IFC_GPIO_RS485_LOGIC 0x08 594#define CP2108_EF_IFC_GPIO_CLOCK 0x10 595#define CP2108_EF_IFC_DYNAMIC_SUSPEND 0x40 596 597/* CP2102N configuration array indices */ 598#define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2 599#define CP210X_2NCONFIG_GPIO_MODE_IDX 581 600#define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587 601#define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600 602 603/* CP2102N QFN20 port configuration values */ 604#define CP2102N_QFN20_GPIO2_TXLED_MODE BIT(2) 605#define CP2102N_QFN20_GPIO3_RXLED_MODE BIT(3) 606#define CP2102N_QFN20_GPIO1_RS485_MODE BIT(4) 607#define CP2102N_QFN20_GPIO0_CLK_MODE BIT(6) 608 609/* 610 * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x02 bytes 611 * for CP2102N, CP2103, CP2104 and CP2105. 612 */ 613struct cp210x_gpio_write { 614 u8 mask; 615 u8 state; 616}; 617 618/* 619 * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x04 bytes 620 * for CP2108. 621 */ 622struct cp210x_gpio_write16 { 623 __le16 mask; 624 __le16 state; 625}; 626 627/* 628 * Helper to get interface number when we only have struct usb_serial. 629 */ 630static u8 cp210x_interface_num(struct usb_serial *serial) 631{ 632 struct usb_host_interface *cur_altsetting; 633 634 cur_altsetting = serial->interface->cur_altsetting; 635 636 return cur_altsetting->desc.bInterfaceNumber; 637} 638 639/* 640 * Reads a variable-sized block of CP210X_ registers, identified by req. 641 * Returns data into buf in native USB byte order. 642 */ 643static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, 644 void *buf, int bufsize) 645{ 646 struct usb_serial *serial = port->serial; 647 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 648 int result; 649 650 651 result = usb_control_msg_recv(serial->dev, 0, req, 652 REQTYPE_INTERFACE_TO_HOST, 0, 653 port_priv->bInterfaceNumber, buf, bufsize, 654 USB_CTRL_SET_TIMEOUT, GFP_KERNEL); 655 if (result) { 656 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", 657 req, bufsize, result); 658 return result; 659 } 660 661 return 0; 662} 663 664/* 665 * Reads any 8-bit CP210X_ register identified by req. 666 */ 667static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val) 668{ 669 return cp210x_read_reg_block(port, req, val, sizeof(*val)); 670} 671 672/* 673 * Reads a variable-sized vendor block of CP210X_ registers, identified by val. 674 * Returns data into buf in native USB byte order. 675 */ 676static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val, 677 void *buf, int bufsize) 678{ 679 int result; 680 681 result = usb_control_msg_recv(serial->dev, 0, CP210X_VENDOR_SPECIFIC, 682 type, val, cp210x_interface_num(serial), buf, bufsize, 683 USB_CTRL_GET_TIMEOUT, GFP_KERNEL); 684 if (result) { 685 dev_err(&serial->interface->dev, 686 "failed to get vendor val 0x%04x size %d: %d\n", val, 687 bufsize, result); 688 return result; 689 } 690 691 return 0; 692} 693 694/* 695 * Writes any 16-bit CP210X_ register (req) whose value is passed 696 * entirely in the wValue field of the USB request. 697 */ 698static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) 699{ 700 struct usb_serial *serial = port->serial; 701 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 702 int result; 703 704 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 705 req, REQTYPE_HOST_TO_INTERFACE, val, 706 port_priv->bInterfaceNumber, NULL, 0, 707 USB_CTRL_SET_TIMEOUT); 708 if (result < 0) { 709 dev_err(&port->dev, "failed set request 0x%x status: %d\n", 710 req, result); 711 } 712 713 return result; 714} 715 716/* 717 * Writes a variable-sized block of CP210X_ registers, identified by req. 718 * Data in buf must be in native USB byte order. 719 */ 720static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req, 721 void *buf, int bufsize) 722{ 723 struct usb_serial *serial = port->serial; 724 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 725 int result; 726 727 result = usb_control_msg_send(serial->dev, 0, req, 728 REQTYPE_HOST_TO_INTERFACE, 0, 729 port_priv->bInterfaceNumber, buf, bufsize, 730 USB_CTRL_SET_TIMEOUT, GFP_KERNEL); 731 if (result) { 732 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", 733 req, bufsize, result); 734 return result; 735 } 736 737 return 0; 738} 739 740/* 741 * Writes any 32-bit CP210X_ register identified by req. 742 */ 743static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) 744{ 745 __le32 le32_val; 746 747 le32_val = cpu_to_le32(val); 748 749 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); 750} 751 752#ifdef CONFIG_GPIOLIB 753/* 754 * Writes a variable-sized vendor block of CP210X_ registers, identified by val. 755 * Data in buf must be in native USB byte order. 756 */ 757static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type, 758 u16 val, void *buf, int bufsize) 759{ 760 int result; 761 762 result = usb_control_msg_send(serial->dev, 0, CP210X_VENDOR_SPECIFIC, 763 type, val, cp210x_interface_num(serial), buf, bufsize, 764 USB_CTRL_SET_TIMEOUT, GFP_KERNEL); 765 if (result) { 766 dev_err(&serial->interface->dev, 767 "failed to set vendor val 0x%04x size %d: %d\n", val, 768 bufsize, result); 769 return result; 770 } 771 772 return 0; 773} 774#endif 775 776static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 777{ 778 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 779 int result; 780 781 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 782 if (result) { 783 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 784 return result; 785 } 786 787 if (tty) 788 cp210x_set_termios(tty, port, NULL); 789 790 result = usb_serial_generic_open(tty, port); 791 if (result) 792 goto err_disable; 793 794 return 0; 795 796err_disable: 797 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 798 port_priv->event_mode = false; 799 800 return result; 801} 802 803static void cp210x_close(struct usb_serial_port *port) 804{ 805 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 806 807 usb_serial_generic_close(port); 808 809 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 810 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 811 812 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 813 814 /* Disabling the interface disables event-insertion mode. */ 815 port_priv->event_mode = false; 816} 817 818static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag) 819{ 820 if (lsr & CP210X_LSR_BREAK) { 821 port->icount.brk++; 822 *flag = TTY_BREAK; 823 } else if (lsr & CP210X_LSR_PARITY) { 824 port->icount.parity++; 825 *flag = TTY_PARITY; 826 } else if (lsr & CP210X_LSR_FRAME) { 827 port->icount.frame++; 828 *flag = TTY_FRAME; 829 } 830 831 if (lsr & CP210X_LSR_OVERRUN) { 832 port->icount.overrun++; 833 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); 834 } 835} 836 837static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag) 838{ 839 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 840 841 switch (port_priv->event_state) { 842 case ES_DATA: 843 if (*ch == CP210X_ESCCHAR) { 844 port_priv->event_state = ES_ESCAPE; 845 break; 846 } 847 return false; 848 case ES_ESCAPE: 849 switch (*ch) { 850 case 0: 851 dev_dbg(&port->dev, "%s - escape char\n", __func__); 852 *ch = CP210X_ESCCHAR; 853 port_priv->event_state = ES_DATA; 854 return false; 855 case 1: 856 port_priv->event_state = ES_LSR_DATA_0; 857 break; 858 case 2: 859 port_priv->event_state = ES_LSR; 860 break; 861 case 3: 862 port_priv->event_state = ES_MSR; 863 break; 864 default: 865 dev_err(&port->dev, "malformed event 0x%02x\n", *ch); 866 port_priv->event_state = ES_DATA; 867 break; 868 } 869 break; 870 case ES_LSR_DATA_0: 871 port_priv->lsr = *ch; 872 port_priv->event_state = ES_LSR_DATA_1; 873 break; 874 case ES_LSR_DATA_1: 875 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n", 876 __func__, port_priv->lsr, *ch); 877 cp210x_process_lsr(port, port_priv->lsr, flag); 878 port_priv->event_state = ES_DATA; 879 return false; 880 case ES_LSR: 881 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch); 882 port_priv->lsr = *ch; 883 cp210x_process_lsr(port, port_priv->lsr, flag); 884 port_priv->event_state = ES_DATA; 885 break; 886 case ES_MSR: 887 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch); 888 /* unimplemented */ 889 port_priv->event_state = ES_DATA; 890 break; 891 } 892 893 return true; 894} 895 896static void cp210x_process_read_urb(struct urb *urb) 897{ 898 struct usb_serial_port *port = urb->context; 899 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 900 unsigned char *ch = urb->transfer_buffer; 901 char flag; 902 int i; 903 904 if (!urb->actual_length) 905 return; 906 907 if (port_priv->event_mode) { 908 for (i = 0; i < urb->actual_length; i++, ch++) { 909 flag = TTY_NORMAL; 910 911 if (cp210x_process_char(port, ch, &flag)) 912 continue; 913 914 tty_insert_flip_char(&port->port, *ch, flag); 915 } 916 } else { 917 tty_insert_flip_string(&port->port, ch, urb->actual_length); 918 } 919 tty_flip_buffer_push(&port->port); 920} 921 922/* 923 * Read how many bytes are waiting in the TX queue. 924 */ 925static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 926 u32 *count) 927{ 928 struct usb_serial *serial = port->serial; 929 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 930 struct cp210x_comm_status sts; 931 int result; 932 933 result = usb_control_msg_recv(serial->dev, 0, CP210X_GET_COMM_STATUS, 934 REQTYPE_INTERFACE_TO_HOST, 0, 935 port_priv->bInterfaceNumber, &sts, sizeof(sts), 936 USB_CTRL_GET_TIMEOUT, GFP_KERNEL); 937 if (result) { 938 dev_err(&port->dev, "failed to get comm status: %d\n", result); 939 return result; 940 } 941 942 *count = le32_to_cpu(sts.ulAmountInOutQueue); 943 944 return 0; 945} 946 947static bool cp210x_tx_empty(struct usb_serial_port *port) 948{ 949 int err; 950 u32 count; 951 952 err = cp210x_get_tx_queue_byte_count(port, &count); 953 if (err) 954 return true; 955 956 return !count; 957} 958 959struct cp210x_rate { 960 speed_t rate; 961 speed_t high; 962}; 963 964static const struct cp210x_rate cp210x_an205_table1[] = { 965 { 300, 300 }, 966 { 600, 600 }, 967 { 1200, 1200 }, 968 { 1800, 1800 }, 969 { 2400, 2400 }, 970 { 4000, 4000 }, 971 { 4800, 4803 }, 972 { 7200, 7207 }, 973 { 9600, 9612 }, 974 { 14400, 14428 }, 975 { 16000, 16062 }, 976 { 19200, 19250 }, 977 { 28800, 28912 }, 978 { 38400, 38601 }, 979 { 51200, 51558 }, 980 { 56000, 56280 }, 981 { 57600, 58053 }, 982 { 64000, 64111 }, 983 { 76800, 77608 }, 984 { 115200, 117028 }, 985 { 128000, 129347 }, 986 { 153600, 156868 }, 987 { 230400, 237832 }, 988 { 250000, 254234 }, 989 { 256000, 273066 }, 990 { 460800, 491520 }, 991 { 500000, 567138 }, 992 { 576000, 670254 }, 993 { 921600, UINT_MAX } 994}; 995 996/* 997 * Quantises the baud rate as per AN205 Table 1 998 */ 999static speed_t cp210x_get_an205_rate(speed_t baud) 1000{ 1001 int i; 1002 1003 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) { 1004 if (baud <= cp210x_an205_table1[i].high) 1005 break; 1006 } 1007 1008 return cp210x_an205_table1[i].rate; 1009} 1010 1011static speed_t cp210x_get_actual_rate(speed_t baud) 1012{ 1013 unsigned int prescale = 1; 1014 unsigned int div; 1015 1016 if (baud <= 365) 1017 prescale = 4; 1018 1019 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud); 1020 baud = 48000000 / (2 * prescale * div); 1021 1022 return baud; 1023} 1024 1025/* 1026 * CP2101 supports the following baud rates: 1027 * 1028 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 1029 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 1030 * 1031 * CP2102 and CP2103 support the following additional rates: 1032 * 1033 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 1034 * 576000 1035 * 1036 * The device will map a requested rate to a supported one, but the result 1037 * of requests for rates greater than 1053257 is undefined (see AN205). 1038 * 1039 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 1040 * respectively, with an error less than 1%. The actual rates are determined 1041 * by 1042 * 1043 * div = round(freq / (2 x prescale x request)) 1044 * actual = freq / (2 x prescale x div) 1045 * 1046 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 1047 * or 1 otherwise. 1048 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 1049 * otherwise. 1050 */ 1051static void cp210x_change_speed(struct tty_struct *tty, 1052 struct usb_serial_port *port, 1053 const struct ktermios *old_termios) 1054{ 1055 struct usb_serial *serial = port->serial; 1056 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1057 u32 baud; 1058 1059 if (tty->termios.c_ospeed == 0) 1060 return; 1061 1062 /* 1063 * This maps the requested rate to the actual rate, a valid rate on 1064 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed]. 1065 */ 1066 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed); 1067 1068 if (priv->use_actual_rate) 1069 baud = cp210x_get_actual_rate(baud); 1070 else if (baud < 1000000) 1071 baud = cp210x_get_an205_rate(baud); 1072 1073 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 1074 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { 1075 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 1076 if (old_termios) 1077 baud = old_termios->c_ospeed; 1078 else 1079 baud = 9600; 1080 } 1081 1082 tty_encode_baud_rate(tty, baud, baud); 1083} 1084 1085static void cp210x_enable_event_mode(struct usb_serial_port *port) 1086{ 1087 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1088 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1089 int ret; 1090 1091 if (port_priv->event_mode) 1092 return; 1093 1094 if (priv->no_event_mode) 1095 return; 1096 1097 port_priv->event_state = ES_DATA; 1098 port_priv->event_mode = true; 1099 1100 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR); 1101 if (ret) { 1102 dev_err(&port->dev, "failed to enable events: %d\n", ret); 1103 port_priv->event_mode = false; 1104 } 1105} 1106 1107static void cp210x_disable_event_mode(struct usb_serial_port *port) 1108{ 1109 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1110 int ret; 1111 1112 if (!port_priv->event_mode) 1113 return; 1114 1115 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0); 1116 if (ret) { 1117 dev_err(&port->dev, "failed to disable events: %d\n", ret); 1118 return; 1119 } 1120 1121 port_priv->event_mode = false; 1122} 1123 1124static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b) 1125{ 1126 bool iflag_change, cc_change; 1127 1128 iflag_change = ((a->c_iflag ^ b->c_iflag) & (INPCK | IXON | IXOFF)); 1129 cc_change = a->c_cc[VSTART] != b->c_cc[VSTART] || 1130 a->c_cc[VSTOP] != b->c_cc[VSTOP]; 1131 1132 return tty_termios_hw_change(a, b) || iflag_change || cc_change; 1133} 1134 1135static void cp210x_set_flow_control(struct tty_struct *tty, 1136 struct usb_serial_port *port, 1137 const struct ktermios *old_termios) 1138{ 1139 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1140 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1141 struct cp210x_special_chars chars; 1142 struct cp210x_flow_ctl flow_ctl; 1143 u32 flow_repl; 1144 u32 ctl_hs; 1145 bool crtscts; 1146 int ret; 1147 1148 /* 1149 * Some CP2102N interpret ulXonLimit as ulFlowReplace (erratum 1150 * CP2102N_E104). Report back that flow control is not supported. 1151 */ 1152 if (priv->no_flow_control) { 1153 tty->termios.c_cflag &= ~CRTSCTS; 1154 tty->termios.c_iflag &= ~(IXON | IXOFF); 1155 } 1156 1157 if (tty->termios.c_ospeed != 0 && 1158 old_termios && old_termios->c_ospeed != 0 && 1159 C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) && 1160 I_IXON(tty) == (old_termios->c_iflag & IXON) && 1161 I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) && 1162 START_CHAR(tty) == old_termios->c_cc[VSTART] && 1163 STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) { 1164 return; 1165 } 1166 1167 if (I_IXON(tty) || I_IXOFF(tty)) { 1168 memset(&chars, 0, sizeof(chars)); 1169 1170 chars.bXonChar = START_CHAR(tty); 1171 chars.bXoffChar = STOP_CHAR(tty); 1172 1173 ret = cp210x_write_reg_block(port, CP210X_SET_CHARS, &chars, 1174 sizeof(chars)); 1175 if (ret) { 1176 dev_err(&port->dev, "failed to set special chars: %d\n", 1177 ret); 1178 } 1179 } 1180 1181 mutex_lock(&port_priv->mutex); 1182 1183 if (tty->termios.c_ospeed == 0) { 1184 port_priv->dtr = false; 1185 port_priv->rts = false; 1186 } else if (old_termios && old_termios->c_ospeed == 0) { 1187 port_priv->dtr = true; 1188 port_priv->rts = true; 1189 } 1190 1191 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1192 sizeof(flow_ctl)); 1193 if (ret) 1194 goto out_unlock; 1195 1196 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1197 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1198 1199 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE; 1200 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE; 1201 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY; 1202 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1203 if (port_priv->dtr) 1204 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE; 1205 else 1206 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE; 1207 1208 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1209 if (C_CRTSCTS(tty)) { 1210 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE; 1211 if (port_priv->rts) 1212 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL; 1213 else 1214 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1215 crtscts = true; 1216 } else { 1217 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE; 1218 if (port_priv->rts) 1219 flow_repl |= CP210X_SERIAL_RTS_ACTIVE; 1220 else 1221 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1222 crtscts = false; 1223 } 1224 1225 if (I_IXOFF(tty)) { 1226 flow_repl |= CP210X_SERIAL_AUTO_RECEIVE; 1227 1228 flow_ctl.ulXonLimit = cpu_to_le32(128); 1229 flow_ctl.ulXoffLimit = cpu_to_le32(128); 1230 } else { 1231 flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE; 1232 } 1233 1234 if (I_IXON(tty)) 1235 flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT; 1236 else 1237 flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT; 1238 1239 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__, 1240 ctl_hs, flow_repl); 1241 1242 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1243 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1244 1245 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1246 sizeof(flow_ctl)); 1247 if (ret) 1248 goto out_unlock; 1249 1250 port_priv->crtscts = crtscts; 1251out_unlock: 1252 mutex_unlock(&port_priv->mutex); 1253} 1254 1255static void cp210x_set_termios(struct tty_struct *tty, 1256 struct usb_serial_port *port, 1257 const struct ktermios *old_termios) 1258{ 1259 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1260 u16 bits; 1261 int ret; 1262 1263 if (old_termios && !cp210x_termios_change(&tty->termios, old_termios) && 1264 tty->termios.c_ospeed != 0) 1265 return; 1266 1267 if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed) 1268 cp210x_change_speed(tty, port, old_termios); 1269 1270 /* CP2101 only supports CS8, 1 stop bit and non-stick parity. */ 1271 if (priv->partnum == CP210X_PARTNUM_CP2101) { 1272 tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR); 1273 tty->termios.c_cflag |= CS8; 1274 } 1275 1276 bits = 0; 1277 1278 switch (C_CSIZE(tty)) { 1279 case CS5: 1280 bits |= BITS_DATA_5; 1281 break; 1282 case CS6: 1283 bits |= BITS_DATA_6; 1284 break; 1285 case CS7: 1286 bits |= BITS_DATA_7; 1287 break; 1288 case CS8: 1289 default: 1290 bits |= BITS_DATA_8; 1291 break; 1292 } 1293 1294 if (C_PARENB(tty)) { 1295 if (C_CMSPAR(tty)) { 1296 if (C_PARODD(tty)) 1297 bits |= BITS_PARITY_MARK; 1298 else 1299 bits |= BITS_PARITY_SPACE; 1300 } else { 1301 if (C_PARODD(tty)) 1302 bits |= BITS_PARITY_ODD; 1303 else 1304 bits |= BITS_PARITY_EVEN; 1305 } 1306 } 1307 1308 if (C_CSTOPB(tty)) 1309 bits |= BITS_STOP_2; 1310 else 1311 bits |= BITS_STOP_1; 1312 1313 ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1314 if (ret) 1315 dev_err(&port->dev, "failed to set line control: %d\n", ret); 1316 1317 cp210x_set_flow_control(tty, port, old_termios); 1318 1319 /* 1320 * Enable event-insertion mode only if input parity checking is 1321 * enabled for now. 1322 */ 1323 if (I_INPCK(tty)) 1324 cp210x_enable_event_mode(port); 1325 else 1326 cp210x_disable_event_mode(port); 1327} 1328 1329static int cp210x_tiocmset(struct tty_struct *tty, 1330 unsigned int set, unsigned int clear) 1331{ 1332 struct usb_serial_port *port = tty->driver_data; 1333 return cp210x_tiocmset_port(port, set, clear); 1334} 1335 1336static int cp210x_tiocmset_port(struct usb_serial_port *port, 1337 unsigned int set, unsigned int clear) 1338{ 1339 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1340 struct cp210x_flow_ctl flow_ctl; 1341 u32 ctl_hs, flow_repl; 1342 u16 control = 0; 1343 int ret; 1344 1345 mutex_lock(&port_priv->mutex); 1346 1347 if (set & TIOCM_RTS) { 1348 port_priv->rts = true; 1349 control |= CONTROL_RTS; 1350 control |= CONTROL_WRITE_RTS; 1351 } 1352 if (set & TIOCM_DTR) { 1353 port_priv->dtr = true; 1354 control |= CONTROL_DTR; 1355 control |= CONTROL_WRITE_DTR; 1356 } 1357 if (clear & TIOCM_RTS) { 1358 port_priv->rts = false; 1359 control &= ~CONTROL_RTS; 1360 control |= CONTROL_WRITE_RTS; 1361 } 1362 if (clear & TIOCM_DTR) { 1363 port_priv->dtr = false; 1364 control &= ~CONTROL_DTR; 1365 control |= CONTROL_WRITE_DTR; 1366 } 1367 1368 /* 1369 * Use SET_FLOW to set DTR and enable/disable auto-RTS when hardware 1370 * flow control is enabled. 1371 */ 1372 if (port_priv->crtscts && control & CONTROL_WRITE_RTS) { 1373 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1374 sizeof(flow_ctl)); 1375 if (ret) 1376 goto out_unlock; 1377 1378 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1379 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1380 1381 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1382 if (port_priv->dtr) 1383 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE; 1384 else 1385 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE; 1386 1387 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1388 if (port_priv->rts) 1389 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL; 1390 else 1391 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1392 1393 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1394 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1395 1396 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", 1397 __func__, ctl_hs, flow_repl); 1398 1399 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1400 sizeof(flow_ctl)); 1401 } else { 1402 dev_dbg(&port->dev, "%s - control = 0x%04x\n", __func__, control); 1403 1404 ret = cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1405 } 1406out_unlock: 1407 mutex_unlock(&port_priv->mutex); 1408 1409 return ret; 1410} 1411 1412static void cp210x_dtr_rts(struct usb_serial_port *port, int on) 1413{ 1414 if (on) 1415 cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0); 1416 else 1417 cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS); 1418} 1419 1420static int cp210x_tiocmget(struct tty_struct *tty) 1421{ 1422 struct usb_serial_port *port = tty->driver_data; 1423 u8 control; 1424 int result; 1425 1426 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1427 if (result) 1428 return result; 1429 1430 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1431 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1432 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1433 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1434 |((control & CONTROL_RING)? TIOCM_RI : 0) 1435 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1436 1437 dev_dbg(&port->dev, "%s - control = 0x%02x\n", __func__, control); 1438 1439 return result; 1440} 1441 1442static int cp210x_break_ctl(struct tty_struct *tty, int break_state) 1443{ 1444 struct usb_serial_port *port = tty->driver_data; 1445 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1446 u16 state; 1447 1448 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1449 if (cp210x_interface_num(port->serial) == 1) 1450 return -ENOTTY; 1451 } 1452 1453 if (break_state == 0) 1454 state = BREAK_OFF; 1455 else 1456 state = BREAK_ON; 1457 1458 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1459 state == BREAK_OFF ? "off" : "on"); 1460 1461 return cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1462} 1463 1464#ifdef CONFIG_GPIOLIB 1465static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio) 1466{ 1467 struct usb_serial *serial = gpiochip_get_data(gc); 1468 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1469 u8 req_type; 1470 u16 mask; 1471 int result; 1472 int len; 1473 1474 result = usb_autopm_get_interface(serial->interface); 1475 if (result) 1476 return result; 1477 1478 switch (priv->partnum) { 1479 case CP210X_PARTNUM_CP2105: 1480 req_type = REQTYPE_INTERFACE_TO_HOST; 1481 len = 1; 1482 break; 1483 case CP210X_PARTNUM_CP2108: 1484 req_type = REQTYPE_INTERFACE_TO_HOST; 1485 len = 2; 1486 break; 1487 default: 1488 req_type = REQTYPE_DEVICE_TO_HOST; 1489 len = 1; 1490 break; 1491 } 1492 1493 mask = 0; 1494 result = cp210x_read_vendor_block(serial, req_type, CP210X_READ_LATCH, 1495 &mask, len); 1496 1497 usb_autopm_put_interface(serial->interface); 1498 1499 if (result < 0) 1500 return result; 1501 1502 le16_to_cpus(&mask); 1503 1504 return !!(mask & BIT(gpio)); 1505} 1506 1507static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value) 1508{ 1509 struct usb_serial *serial = gpiochip_get_data(gc); 1510 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1511 struct cp210x_gpio_write16 buf16; 1512 struct cp210x_gpio_write buf; 1513 u16 mask, state; 1514 u16 wIndex; 1515 int result; 1516 1517 if (value == 1) 1518 state = BIT(gpio); 1519 else 1520 state = 0; 1521 1522 mask = BIT(gpio); 1523 1524 result = usb_autopm_get_interface(serial->interface); 1525 if (result) 1526 goto out; 1527 1528 switch (priv->partnum) { 1529 case CP210X_PARTNUM_CP2105: 1530 buf.mask = (u8)mask; 1531 buf.state = (u8)state; 1532 result = cp210x_write_vendor_block(serial, 1533 REQTYPE_HOST_TO_INTERFACE, 1534 CP210X_WRITE_LATCH, &buf, 1535 sizeof(buf)); 1536 break; 1537 case CP210X_PARTNUM_CP2108: 1538 buf16.mask = cpu_to_le16(mask); 1539 buf16.state = cpu_to_le16(state); 1540 result = cp210x_write_vendor_block(serial, 1541 REQTYPE_HOST_TO_INTERFACE, 1542 CP210X_WRITE_LATCH, &buf16, 1543 sizeof(buf16)); 1544 break; 1545 default: 1546 wIndex = state << 8 | mask; 1547 result = usb_control_msg(serial->dev, 1548 usb_sndctrlpipe(serial->dev, 0), 1549 CP210X_VENDOR_SPECIFIC, 1550 REQTYPE_HOST_TO_DEVICE, 1551 CP210X_WRITE_LATCH, 1552 wIndex, 1553 NULL, 0, USB_CTRL_SET_TIMEOUT); 1554 break; 1555 } 1556 1557 usb_autopm_put_interface(serial->interface); 1558out: 1559 if (result < 0) { 1560 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n", 1561 result); 1562 } 1563} 1564 1565static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio) 1566{ 1567 struct usb_serial *serial = gpiochip_get_data(gc); 1568 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1569 1570 return priv->gpio_input & BIT(gpio); 1571} 1572 1573static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio) 1574{ 1575 struct usb_serial *serial = gpiochip_get_data(gc); 1576 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1577 1578 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1579 /* hardware does not support an input mode */ 1580 return -ENOTSUPP; 1581 } 1582 1583 /* push-pull pins cannot be changed to be inputs */ 1584 if (priv->gpio_pushpull & BIT(gpio)) 1585 return -EINVAL; 1586 1587 /* make sure to release pin if it is being driven low */ 1588 cp210x_gpio_set(gc, gpio, 1); 1589 1590 priv->gpio_input |= BIT(gpio); 1591 1592 return 0; 1593} 1594 1595static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio, 1596 int value) 1597{ 1598 struct usb_serial *serial = gpiochip_get_data(gc); 1599 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1600 1601 priv->gpio_input &= ~BIT(gpio); 1602 cp210x_gpio_set(gc, gpio, value); 1603 1604 return 0; 1605} 1606 1607static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio, 1608 unsigned long config) 1609{ 1610 struct usb_serial *serial = gpiochip_get_data(gc); 1611 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1612 enum pin_config_param param = pinconf_to_config_param(config); 1613 1614 /* Succeed only if in correct mode (this can't be set at runtime) */ 1615 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) && 1616 (priv->gpio_pushpull & BIT(gpio))) 1617 return 0; 1618 1619 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) && 1620 !(priv->gpio_pushpull & BIT(gpio))) 1621 return 0; 1622 1623 return -ENOTSUPP; 1624} 1625 1626static int cp210x_gpio_init_valid_mask(struct gpio_chip *gc, 1627 unsigned long *valid_mask, unsigned int ngpios) 1628{ 1629 struct usb_serial *serial = gpiochip_get_data(gc); 1630 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1631 struct device *dev = &serial->interface->dev; 1632 unsigned long altfunc_mask = priv->gpio_altfunc; 1633 1634 bitmap_complement(valid_mask, &altfunc_mask, ngpios); 1635 1636 if (bitmap_empty(valid_mask, ngpios)) 1637 dev_dbg(dev, "no pin configured for GPIO\n"); 1638 else 1639 dev_dbg(dev, "GPIO.%*pbl configured for GPIO\n", ngpios, 1640 valid_mask); 1641 return 0; 1642} 1643 1644/* 1645 * This function is for configuring GPIO using shared pins, where other signals 1646 * are made unavailable by configuring the use of GPIO. This is believed to be 1647 * only applicable to the cp2105 at this point, the other devices supported by 1648 * this driver that provide GPIO do so in a way that does not impact other 1649 * signals and are thus expected to have very different initialisation. 1650 */ 1651static int cp2105_gpioconf_init(struct usb_serial *serial) 1652{ 1653 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1654 struct cp210x_pin_mode mode; 1655 struct cp210x_dual_port_config config; 1656 u8 intf_num = cp210x_interface_num(serial); 1657 u8 iface_config; 1658 int result; 1659 1660 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1661 CP210X_GET_DEVICEMODE, &mode, 1662 sizeof(mode)); 1663 if (result < 0) 1664 return result; 1665 1666 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1667 CP210X_GET_PORTCONFIG, &config, 1668 sizeof(config)); 1669 if (result < 0) 1670 return result; 1671 1672 /* 2 banks of GPIO - One for the pins taken from each serial port */ 1673 if (intf_num == 0) { 1674 priv->gc.ngpio = 2; 1675 1676 if (mode.eci == CP210X_PIN_MODE_MODEM) { 1677 /* mark all GPIOs of this interface as reserved */ 1678 priv->gpio_altfunc = 0xff; 1679 return 0; 1680 } 1681 1682 iface_config = config.eci_cfg; 1683 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1684 CP210X_ECI_GPIO_MODE_MASK) >> 1685 CP210X_ECI_GPIO_MODE_OFFSET); 1686 } else if (intf_num == 1) { 1687 priv->gc.ngpio = 3; 1688 1689 if (mode.sci == CP210X_PIN_MODE_MODEM) { 1690 /* mark all GPIOs of this interface as reserved */ 1691 priv->gpio_altfunc = 0xff; 1692 return 0; 1693 } 1694 1695 iface_config = config.sci_cfg; 1696 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1697 CP210X_SCI_GPIO_MODE_MASK) >> 1698 CP210X_SCI_GPIO_MODE_OFFSET); 1699 } else { 1700 return -ENODEV; 1701 } 1702 1703 /* mark all pins which are not in GPIO mode */ 1704 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */ 1705 priv->gpio_altfunc |= BIT(0); 1706 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */ 1707 CP2105_GPIO1_RS485_MODE)) 1708 priv->gpio_altfunc |= BIT(1); 1709 1710 /* driver implementation for CP2105 only supports outputs */ 1711 priv->gpio_input = 0; 1712 1713 return 0; 1714} 1715 1716static int cp2104_gpioconf_init(struct usb_serial *serial) 1717{ 1718 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1719 struct cp210x_single_port_config config; 1720 u8 iface_config; 1721 u8 gpio_latch; 1722 int result; 1723 u8 i; 1724 1725 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1726 CP210X_GET_PORTCONFIG, &config, 1727 sizeof(config)); 1728 if (result < 0) 1729 return result; 1730 1731 priv->gc.ngpio = 4; 1732 1733 iface_config = config.device_cfg; 1734 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1735 CP210X_GPIO_MODE_MASK) >> 1736 CP210X_GPIO_MODE_OFFSET); 1737 gpio_latch = (u8)((le16_to_cpu(config.reset_state) & 1738 CP210X_GPIO_MODE_MASK) >> 1739 CP210X_GPIO_MODE_OFFSET); 1740 1741 /* mark all pins which are not in GPIO mode */ 1742 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */ 1743 priv->gpio_altfunc |= BIT(0); 1744 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */ 1745 priv->gpio_altfunc |= BIT(1); 1746 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */ 1747 priv->gpio_altfunc |= BIT(2); 1748 1749 /* 1750 * Like CP2102N, CP2104 has also no strict input and output pin 1751 * modes. 1752 * Do the same input mode emulation as CP2102N. 1753 */ 1754 for (i = 0; i < priv->gc.ngpio; ++i) { 1755 /* 1756 * Set direction to "input" iff pin is open-drain and reset 1757 * value is 1. 1758 */ 1759 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1760 priv->gpio_input |= BIT(i); 1761 } 1762 1763 return 0; 1764} 1765 1766static int cp2108_gpio_init(struct usb_serial *serial) 1767{ 1768 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1769 struct cp210x_quad_port_config config; 1770 u16 gpio_latch; 1771 int result; 1772 u8 i; 1773 1774 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1775 CP210X_GET_PORTCONFIG, &config, 1776 sizeof(config)); 1777 if (result < 0) 1778 return result; 1779 1780 priv->gc.ngpio = 16; 1781 priv->gpio_pushpull = le16_to_cpu(config.reset_state.gpio_mode_pb1); 1782 gpio_latch = le16_to_cpu(config.reset_state.gpio_latch_pb1); 1783 1784 /* 1785 * Mark all pins which are not in GPIO mode. 1786 * 1787 * Refer to table 9.1 "GPIO Mode alternate Functions" in the datasheet: 1788 * https://www.silabs.com/documents/public/data-sheets/cp2108-datasheet.pdf 1789 * 1790 * Alternate functions of GPIO0 to GPIO3 are determine by enhancedfxn_ifc[0] 1791 * and the similarly for the other pins; enhancedfxn_ifc[1]: GPIO4 to GPIO7, 1792 * enhancedfxn_ifc[2]: GPIO8 to GPIO11, enhancedfxn_ifc[3]: GPIO12 to GPIO15. 1793 */ 1794 for (i = 0; i < 4; i++) { 1795 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_TXLED) 1796 priv->gpio_altfunc |= BIT(i * 4); 1797 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RXLED) 1798 priv->gpio_altfunc |= BIT((i * 4) + 1); 1799 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RS485) 1800 priv->gpio_altfunc |= BIT((i * 4) + 2); 1801 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_CLOCK) 1802 priv->gpio_altfunc |= BIT((i * 4) + 3); 1803 } 1804 1805 /* 1806 * Like CP2102N, CP2108 has also no strict input and output pin 1807 * modes. Do the same input mode emulation as CP2102N. 1808 */ 1809 for (i = 0; i < priv->gc.ngpio; ++i) { 1810 /* 1811 * Set direction to "input" iff pin is open-drain and reset 1812 * value is 1. 1813 */ 1814 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1815 priv->gpio_input |= BIT(i); 1816 } 1817 1818 return 0; 1819} 1820 1821static int cp2102n_gpioconf_init(struct usb_serial *serial) 1822{ 1823 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1824 const u16 config_size = 0x02a6; 1825 u8 gpio_rst_latch; 1826 u8 config_version; 1827 u8 gpio_pushpull; 1828 u8 *config_buf; 1829 u8 gpio_latch; 1830 u8 gpio_ctrl; 1831 int result; 1832 u8 i; 1833 1834 /* 1835 * Retrieve device configuration from the device. 1836 * The array received contains all customization settings done at the 1837 * factory/manufacturer. Format of the array is documented at the 1838 * time of writing at: 1839 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa 1840 */ 1841 config_buf = kmalloc(config_size, GFP_KERNEL); 1842 if (!config_buf) 1843 return -ENOMEM; 1844 1845 result = cp210x_read_vendor_block(serial, 1846 REQTYPE_DEVICE_TO_HOST, 1847 CP210X_READ_2NCONFIG, 1848 config_buf, 1849 config_size); 1850 if (result < 0) { 1851 kfree(config_buf); 1852 return result; 1853 } 1854 1855 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX]; 1856 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX]; 1857 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX]; 1858 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX]; 1859 1860 kfree(config_buf); 1861 1862 /* Make sure this is a config format we understand. */ 1863 if (config_version != 0x01) 1864 return -ENOTSUPP; 1865 1866 priv->gc.ngpio = 4; 1867 1868 /* 1869 * Get default pin states after reset. Needed so we can determine 1870 * the direction of an open-drain pin. 1871 */ 1872 gpio_latch = (gpio_rst_latch >> 3) & 0x0f; 1873 1874 /* 0 indicates open-drain mode, 1 is push-pull */ 1875 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f; 1876 1877 /* 0 indicates GPIO mode, 1 is alternate function */ 1878 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) { 1879 /* QFN20 is special... */ 1880 if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE) /* GPIO 0 */ 1881 priv->gpio_altfunc |= BIT(0); 1882 if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */ 1883 priv->gpio_altfunc |= BIT(1); 1884 if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */ 1885 priv->gpio_altfunc |= BIT(2); 1886 if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */ 1887 priv->gpio_altfunc |= BIT(3); 1888 } else { 1889 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f; 1890 } 1891 1892 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) { 1893 /* 1894 * For the QFN28 package, GPIO4-6 are controlled by 1895 * the low three bits of the mode/latch fields. 1896 * Contrary to the document linked above, the bits for 1897 * the SUSPEND pins are elsewhere. No alternate 1898 * function is available for these pins. 1899 */ 1900 priv->gc.ngpio = 7; 1901 gpio_latch |= (gpio_rst_latch & 7) << 4; 1902 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4; 1903 } 1904 1905 /* 1906 * The CP2102N does not strictly has input and output pin modes, 1907 * it only knows open-drain and push-pull modes which is set at 1908 * factory. An open-drain pin can function both as an 1909 * input or an output. We emulate input mode for open-drain pins 1910 * by making sure they are not driven low, and we do not allow 1911 * push-pull pins to be set as an input. 1912 */ 1913 for (i = 0; i < priv->gc.ngpio; ++i) { 1914 /* 1915 * Set direction to "input" iff pin is open-drain and reset 1916 * value is 1. 1917 */ 1918 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1919 priv->gpio_input |= BIT(i); 1920 } 1921 1922 return 0; 1923} 1924 1925static int cp210x_gpio_init(struct usb_serial *serial) 1926{ 1927 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1928 int result; 1929 1930 switch (priv->partnum) { 1931 case CP210X_PARTNUM_CP2104: 1932 result = cp2104_gpioconf_init(serial); 1933 break; 1934 case CP210X_PARTNUM_CP2105: 1935 result = cp2105_gpioconf_init(serial); 1936 break; 1937 case CP210X_PARTNUM_CP2108: 1938 /* 1939 * The GPIOs are not tied to any specific port so only register 1940 * once for interface 0. 1941 */ 1942 if (cp210x_interface_num(serial) != 0) 1943 return 0; 1944 result = cp2108_gpio_init(serial); 1945 break; 1946 case CP210X_PARTNUM_CP2102N_QFN28: 1947 case CP210X_PARTNUM_CP2102N_QFN24: 1948 case CP210X_PARTNUM_CP2102N_QFN20: 1949 result = cp2102n_gpioconf_init(serial); 1950 break; 1951 default: 1952 return 0; 1953 } 1954 1955 if (result < 0) 1956 return result; 1957 1958 priv->gc.label = "cp210x"; 1959 priv->gc.get_direction = cp210x_gpio_direction_get; 1960 priv->gc.direction_input = cp210x_gpio_direction_input; 1961 priv->gc.direction_output = cp210x_gpio_direction_output; 1962 priv->gc.get = cp210x_gpio_get; 1963 priv->gc.set = cp210x_gpio_set; 1964 priv->gc.set_config = cp210x_gpio_set_config; 1965 priv->gc.init_valid_mask = cp210x_gpio_init_valid_mask; 1966 priv->gc.owner = THIS_MODULE; 1967 priv->gc.parent = &serial->interface->dev; 1968 priv->gc.base = -1; 1969 priv->gc.can_sleep = true; 1970 1971 result = gpiochip_add_data(&priv->gc, serial); 1972 if (!result) 1973 priv->gpio_registered = true; 1974 1975 return result; 1976} 1977 1978static void cp210x_gpio_remove(struct usb_serial *serial) 1979{ 1980 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1981 1982 if (priv->gpio_registered) { 1983 gpiochip_remove(&priv->gc); 1984 priv->gpio_registered = false; 1985 } 1986} 1987 1988#else 1989 1990static int cp210x_gpio_init(struct usb_serial *serial) 1991{ 1992 return 0; 1993} 1994 1995static void cp210x_gpio_remove(struct usb_serial *serial) 1996{ 1997 /* Nothing to do */ 1998} 1999 2000#endif 2001 2002static int cp210x_port_probe(struct usb_serial_port *port) 2003{ 2004 struct usb_serial *serial = port->serial; 2005 struct cp210x_port_private *port_priv; 2006 2007 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 2008 if (!port_priv) 2009 return -ENOMEM; 2010 2011 port_priv->bInterfaceNumber = cp210x_interface_num(serial); 2012 mutex_init(&port_priv->mutex); 2013 2014 usb_set_serial_port_data(port, port_priv); 2015 2016 return 0; 2017} 2018 2019static void cp210x_port_remove(struct usb_serial_port *port) 2020{ 2021 struct cp210x_port_private *port_priv; 2022 2023 port_priv = usb_get_serial_port_data(port); 2024 kfree(port_priv); 2025} 2026 2027static void cp210x_init_max_speed(struct usb_serial *serial) 2028{ 2029 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2030 bool use_actual_rate = false; 2031 speed_t min = 300; 2032 speed_t max; 2033 2034 switch (priv->partnum) { 2035 case CP210X_PARTNUM_CP2101: 2036 max = 921600; 2037 break; 2038 case CP210X_PARTNUM_CP2102: 2039 case CP210X_PARTNUM_CP2103: 2040 max = 1000000; 2041 break; 2042 case CP210X_PARTNUM_CP2104: 2043 use_actual_rate = true; 2044 max = 2000000; 2045 break; 2046 case CP210X_PARTNUM_CP2108: 2047 max = 2000000; 2048 break; 2049 case CP210X_PARTNUM_CP2105: 2050 if (cp210x_interface_num(serial) == 0) { 2051 use_actual_rate = true; 2052 max = 2000000; /* ECI */ 2053 } else { 2054 min = 2400; 2055 max = 921600; /* SCI */ 2056 } 2057 break; 2058 case CP210X_PARTNUM_CP2102N_QFN28: 2059 case CP210X_PARTNUM_CP2102N_QFN24: 2060 case CP210X_PARTNUM_CP2102N_QFN20: 2061 use_actual_rate = true; 2062 max = 3000000; 2063 break; 2064 default: 2065 max = 2000000; 2066 break; 2067 } 2068 2069 priv->min_speed = min; 2070 priv->max_speed = max; 2071 priv->use_actual_rate = use_actual_rate; 2072} 2073 2074static void cp2102_determine_quirks(struct usb_serial *serial) 2075{ 2076 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2077 u8 *buf; 2078 int ret; 2079 2080 buf = kmalloc(2, GFP_KERNEL); 2081 if (!buf) 2082 return; 2083 /* 2084 * Some (possibly counterfeit) CP2102 do not support event-insertion 2085 * mode and respond differently to malformed vendor requests. 2086 * Specifically, they return one instead of two bytes when sent a 2087 * two-byte part-number request. 2088 */ 2089 ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 2090 CP210X_VENDOR_SPECIFIC, REQTYPE_DEVICE_TO_HOST, 2091 CP210X_GET_PARTNUM, 0, buf, 2, USB_CTRL_GET_TIMEOUT); 2092 if (ret == 1) { 2093 dev_dbg(&serial->interface->dev, 2094 "device does not support event-insertion mode\n"); 2095 priv->no_event_mode = true; 2096 } 2097 2098 kfree(buf); 2099} 2100 2101static int cp210x_get_fw_version(struct usb_serial *serial, u16 value) 2102{ 2103 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2104 u8 ver[3]; 2105 int ret; 2106 2107 ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, value, 2108 ver, sizeof(ver)); 2109 if (ret) 2110 return ret; 2111 2112 dev_dbg(&serial->interface->dev, "%s - %d.%d.%d\n", __func__, 2113 ver[0], ver[1], ver[2]); 2114 2115 priv->fw_version = ver[0] << 16 | ver[1] << 8 | ver[2]; 2116 2117 return 0; 2118} 2119 2120static void cp210x_determine_type(struct usb_serial *serial) 2121{ 2122 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2123 int ret; 2124 2125 ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 2126 CP210X_GET_PARTNUM, &priv->partnum, 2127 sizeof(priv->partnum)); 2128 if (ret < 0) { 2129 dev_warn(&serial->interface->dev, 2130 "querying part number failed\n"); 2131 priv->partnum = CP210X_PARTNUM_UNKNOWN; 2132 return; 2133 } 2134 2135 dev_dbg(&serial->interface->dev, "partnum = 0x%02x\n", priv->partnum); 2136 2137 switch (priv->partnum) { 2138 case CP210X_PARTNUM_CP2102: 2139 cp2102_determine_quirks(serial); 2140 break; 2141 case CP210X_PARTNUM_CP2105: 2142 case CP210X_PARTNUM_CP2108: 2143 cp210x_get_fw_version(serial, CP210X_GET_FW_VER); 2144 break; 2145 case CP210X_PARTNUM_CP2102N_QFN28: 2146 case CP210X_PARTNUM_CP2102N_QFN24: 2147 case CP210X_PARTNUM_CP2102N_QFN20: 2148 ret = cp210x_get_fw_version(serial, CP210X_GET_FW_VER_2N); 2149 if (ret) 2150 break; 2151 if (priv->fw_version <= 0x10004) 2152 priv->no_flow_control = true; 2153 break; 2154 default: 2155 break; 2156 } 2157} 2158 2159static int cp210x_attach(struct usb_serial *serial) 2160{ 2161 int result; 2162 struct cp210x_serial_private *priv; 2163 2164 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 2165 if (!priv) 2166 return -ENOMEM; 2167 2168 usb_set_serial_data(serial, priv); 2169 2170 cp210x_determine_type(serial); 2171 cp210x_init_max_speed(serial); 2172 2173 result = cp210x_gpio_init(serial); 2174 if (result < 0) { 2175 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n", 2176 result); 2177 } 2178 2179 return 0; 2180} 2181 2182static void cp210x_disconnect(struct usb_serial *serial) 2183{ 2184 cp210x_gpio_remove(serial); 2185} 2186 2187static void cp210x_release(struct usb_serial *serial) 2188{ 2189 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2190 2191 cp210x_gpio_remove(serial); 2192 2193 kfree(priv); 2194} 2195 2196module_usb_serial_driver(serial_drivers, id_table); 2197 2198MODULE_DESCRIPTION(DRIVER_DESC); 2199MODULE_LICENSE("GPL v2"); 2200