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 * 7 * Support to set flow control line levels using TIOCMGET and TIOCMSET 8 * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow 9 * control thanks to Munir Nassar nassarmu@real-time.com 10 * 11 */ 12 13#include <linux/kernel.h> 14#include <linux/errno.h> 15#include <linux/slab.h> 16#include <linux/tty.h> 17#include <linux/tty_flip.h> 18#include <linux/module.h> 19#include <linux/moduleparam.h> 20#include <linux/usb.h> 21#include <linux/uaccess.h> 22#include <linux/usb/serial.h> 23#include <linux/gpio/driver.h> 24#include <linux/bitops.h> 25#include <linux/mutex.h> 26 27#define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver" 28 29/* 30 * Function Prototypes 31 */ 32static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *); 33static void cp210x_close(struct usb_serial_port *); 34static void cp210x_get_termios(struct tty_struct *, struct usb_serial_port *); 35static void cp210x_get_termios_port(struct usb_serial_port *port, 36 tcflag_t *cflagp, unsigned int *baudp); 37static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *, 38 struct ktermios *); 39static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *, 40 struct ktermios*); 41static bool cp210x_tx_empty(struct usb_serial_port *port); 42static int cp210x_tiocmget(struct tty_struct *); 43static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int); 44static int cp210x_tiocmset_port(struct usb_serial_port *port, 45 unsigned int, unsigned int); 46static void cp210x_break_ctl(struct tty_struct *, int); 47static int cp210x_attach(struct usb_serial *); 48static void cp210x_disconnect(struct usb_serial *); 49static void cp210x_release(struct usb_serial *); 50static int cp210x_port_probe(struct usb_serial_port *); 51static int cp210x_port_remove(struct usb_serial_port *); 52static void cp210x_dtr_rts(struct usb_serial_port *p, int on); 53static void cp210x_process_read_urb(struct urb *urb); 54static void cp210x_enable_event_mode(struct usb_serial_port *port); 55static void cp210x_disable_event_mode(struct usb_serial_port *port); 56 57static const struct usb_device_id id_table[] = { 58 { USB_DEVICE(0x0404, 0x034C) }, /* NCR Retail IO Box */ 59 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */ 60 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */ 61 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 62 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 63 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */ 64 { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */ 65 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */ 66 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */ 67 { USB_DEVICE(0x0908, 0x0070) }, /* Siemens SCALANCE LPE-9000 USB Serial Console */ 68 { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */ 69 { USB_DEVICE(0x0988, 0x0578) }, /* Teraoka AD2000 */ 70 { USB_DEVICE(0x0B00, 0x3070) }, /* Ingenico 3070 */ 71 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */ 72 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */ 73 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */ 74 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */ 75 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */ 76 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */ 77 { USB_DEVICE(0x106F, 0x0003) }, /* CPI / Money Controls Bulk Coin Recycler */ 78 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */ 79 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */ 80 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */ 81 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */ 82 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */ 83 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */ 84 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */ 85 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */ 86 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */ 87 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */ 88 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */ 89 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */ 90 { USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */ 91 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */ 92 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */ 93 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */ 94 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */ 95 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */ 96 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */ 97 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */ 98 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */ 99 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */ 100 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */ 101 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */ 102 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */ 103 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */ 104 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */ 105 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */ 106 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */ 107 { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */ 108 { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */ 109 { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */ 110 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */ 111 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */ 112 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */ 113 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */ 114 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */ 115 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */ 116 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */ 117 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */ 118 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */ 119 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */ 120 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */ 121 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */ 122 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */ 123 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */ 124 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */ 125 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */ 126 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */ 127 { USB_DEVICE(0x10C4, 0x82AA) }, /* Silicon Labs IFS-USB-DATACABLE used with Quint UPS */ 128 { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */ 129 { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */ 130 { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */ 131 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */ 132 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */ 133 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */ 134 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */ 135 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */ 136 { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */ 137 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */ 138 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ 139 { USB_DEVICE(0x10C4, 0x8414) }, /* Decagon USB Cable Adapter */ 140 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ 141 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 142 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */ 143 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ 144 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */ 145 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */ 146 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */ 147 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */ 148 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ 149 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ 150 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */ 151 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 152 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 153 { USB_DEVICE(0x10C4, 0x87ED) }, /* IMST USB-Stick for Smart Meter */ 154 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */ 155 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */ 156 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */ 157 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */ 158 { USB_DEVICE(0x10C4, 0x88D8) }, /* Acuity Brands nLight Air Adapter */ 159 { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */ 160 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */ 161 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */ 162 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */ 163 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */ 164 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */ 165 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */ 166 { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */ 167 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */ 168 { USB_DEVICE(0x10C4, 0x8A5B) }, /* CEL EM3588 ZigBee USB Stick */ 169 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */ 170 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */ 171 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 172 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 173 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */ 174 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 175 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 176 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */ 177 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */ 178 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 179 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 180 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 181 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 182 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 183 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 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 u8 gpio_pushpull; 267 u8 gpio_altfunc; 268 u8 gpio_input; 269#endif 270 u8 partnum; 271 speed_t min_speed; 272 speed_t max_speed; 273 bool use_actual_rate; 274 bool no_event_mode; 275}; 276 277enum cp210x_event_state { 278 ES_DATA, 279 ES_ESCAPE, 280 ES_LSR, 281 ES_LSR_DATA_0, 282 ES_LSR_DATA_1, 283 ES_MSR 284}; 285 286struct cp210x_port_private { 287 u8 bInterfaceNumber; 288 bool has_swapped_line_ctl; 289 bool event_mode; 290 enum cp210x_event_state event_state; 291 u8 lsr; 292}; 293 294static struct usb_serial_driver cp210x_device = { 295 .driver = { 296 .owner = THIS_MODULE, 297 .name = "cp210x", 298 }, 299 .id_table = id_table, 300 .num_ports = 1, 301 .bulk_in_size = 256, 302 .bulk_out_size = 256, 303 .open = cp210x_open, 304 .close = cp210x_close, 305 .break_ctl = cp210x_break_ctl, 306 .set_termios = cp210x_set_termios, 307 .tx_empty = cp210x_tx_empty, 308 .throttle = usb_serial_generic_throttle, 309 .unthrottle = usb_serial_generic_unthrottle, 310 .tiocmget = cp210x_tiocmget, 311 .tiocmset = cp210x_tiocmset, 312 .get_icount = usb_serial_generic_get_icount, 313 .attach = cp210x_attach, 314 .disconnect = cp210x_disconnect, 315 .release = cp210x_release, 316 .port_probe = cp210x_port_probe, 317 .port_remove = cp210x_port_remove, 318 .dtr_rts = cp210x_dtr_rts, 319 .process_read_urb = cp210x_process_read_urb, 320}; 321 322static struct usb_serial_driver * const serial_drivers[] = { 323 &cp210x_device, NULL 324}; 325 326/* Config request types */ 327#define REQTYPE_HOST_TO_INTERFACE 0x41 328#define REQTYPE_INTERFACE_TO_HOST 0xc1 329#define REQTYPE_HOST_TO_DEVICE 0x40 330#define REQTYPE_DEVICE_TO_HOST 0xc0 331 332/* Config request codes */ 333#define CP210X_IFC_ENABLE 0x00 334#define CP210X_SET_BAUDDIV 0x01 335#define CP210X_GET_BAUDDIV 0x02 336#define CP210X_SET_LINE_CTL 0x03 337#define CP210X_GET_LINE_CTL 0x04 338#define CP210X_SET_BREAK 0x05 339#define CP210X_IMM_CHAR 0x06 340#define CP210X_SET_MHS 0x07 341#define CP210X_GET_MDMSTS 0x08 342#define CP210X_SET_XON 0x09 343#define CP210X_SET_XOFF 0x0A 344#define CP210X_SET_EVENTMASK 0x0B 345#define CP210X_GET_EVENTMASK 0x0C 346#define CP210X_SET_CHAR 0x0D 347#define CP210X_GET_CHARS 0x0E 348#define CP210X_GET_PROPS 0x0F 349#define CP210X_GET_COMM_STATUS 0x10 350#define CP210X_RESET 0x11 351#define CP210X_PURGE 0x12 352#define CP210X_SET_FLOW 0x13 353#define CP210X_GET_FLOW 0x14 354#define CP210X_EMBED_EVENTS 0x15 355#define CP210X_GET_EVENTSTATE 0x16 356#define CP210X_SET_CHARS 0x19 357#define CP210X_GET_BAUDRATE 0x1D 358#define CP210X_SET_BAUDRATE 0x1E 359#define CP210X_VENDOR_SPECIFIC 0xFF 360 361/* CP210X_IFC_ENABLE */ 362#define UART_ENABLE 0x0001 363#define UART_DISABLE 0x0000 364 365/* CP210X_(SET|GET)_BAUDDIV */ 366#define BAUD_RATE_GEN_FREQ 0x384000 367 368/* CP210X_(SET|GET)_LINE_CTL */ 369#define BITS_DATA_MASK 0X0f00 370#define BITS_DATA_5 0X0500 371#define BITS_DATA_6 0X0600 372#define BITS_DATA_7 0X0700 373#define BITS_DATA_8 0X0800 374#define BITS_DATA_9 0X0900 375 376#define BITS_PARITY_MASK 0x00f0 377#define BITS_PARITY_NONE 0x0000 378#define BITS_PARITY_ODD 0x0010 379#define BITS_PARITY_EVEN 0x0020 380#define BITS_PARITY_MARK 0x0030 381#define BITS_PARITY_SPACE 0x0040 382 383#define BITS_STOP_MASK 0x000f 384#define BITS_STOP_1 0x0000 385#define BITS_STOP_1_5 0x0001 386#define BITS_STOP_2 0x0002 387 388/* CP210X_SET_BREAK */ 389#define BREAK_ON 0x0001 390#define BREAK_OFF 0x0000 391 392/* CP210X_(SET_MHS|GET_MDMSTS) */ 393#define CONTROL_DTR 0x0001 394#define CONTROL_RTS 0x0002 395#define CONTROL_CTS 0x0010 396#define CONTROL_DSR 0x0020 397#define CONTROL_RING 0x0040 398#define CONTROL_DCD 0x0080 399#define CONTROL_WRITE_DTR 0x0100 400#define CONTROL_WRITE_RTS 0x0200 401 402/* CP210X_VENDOR_SPECIFIC values */ 403#define CP210X_READ_2NCONFIG 0x000E 404#define CP210X_READ_LATCH 0x00C2 405#define CP210X_GET_PARTNUM 0x370B 406#define CP210X_GET_PORTCONFIG 0x370C 407#define CP210X_GET_DEVICEMODE 0x3711 408#define CP210X_WRITE_LATCH 0x37E1 409 410/* Part number definitions */ 411#define CP210X_PARTNUM_CP2101 0x01 412#define CP210X_PARTNUM_CP2102 0x02 413#define CP210X_PARTNUM_CP2103 0x03 414#define CP210X_PARTNUM_CP2104 0x04 415#define CP210X_PARTNUM_CP2105 0x05 416#define CP210X_PARTNUM_CP2108 0x08 417#define CP210X_PARTNUM_CP2102N_QFN28 0x20 418#define CP210X_PARTNUM_CP2102N_QFN24 0x21 419#define CP210X_PARTNUM_CP2102N_QFN20 0x22 420#define CP210X_PARTNUM_UNKNOWN 0xFF 421 422/* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 423struct cp210x_comm_status { 424 __le32 ulErrors; 425 __le32 ulHoldReasons; 426 __le32 ulAmountInInQueue; 427 __le32 ulAmountInOutQueue; 428 u8 bEofReceived; 429 u8 bWaitForImmediate; 430 u8 bReserved; 431} __packed; 432 433/* 434 * CP210X_PURGE - 16 bits passed in wValue of USB request. 435 * SiLabs app note AN571 gives a strange description of the 4 bits: 436 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 437 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 438 */ 439#define PURGE_ALL 0x000f 440 441/* CP210X_EMBED_EVENTS */ 442#define CP210X_ESCCHAR 0xec 443 444#define CP210X_LSR_OVERRUN BIT(1) 445#define CP210X_LSR_PARITY BIT(2) 446#define CP210X_LSR_FRAME BIT(3) 447#define CP210X_LSR_BREAK BIT(4) 448 449 450/* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */ 451struct cp210x_flow_ctl { 452 __le32 ulControlHandshake; 453 __le32 ulFlowReplace; 454 __le32 ulXonLimit; 455 __le32 ulXoffLimit; 456}; 457 458/* cp210x_flow_ctl::ulControlHandshake */ 459#define CP210X_SERIAL_DTR_MASK GENMASK(1, 0) 460#define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode) 461#define CP210X_SERIAL_CTS_HANDSHAKE BIT(3) 462#define CP210X_SERIAL_DSR_HANDSHAKE BIT(4) 463#define CP210X_SERIAL_DCD_HANDSHAKE BIT(5) 464#define CP210X_SERIAL_DSR_SENSITIVITY BIT(6) 465 466/* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */ 467#define CP210X_SERIAL_DTR_INACTIVE 0 468#define CP210X_SERIAL_DTR_ACTIVE 1 469#define CP210X_SERIAL_DTR_FLOW_CTL 2 470 471/* cp210x_flow_ctl::ulFlowReplace */ 472#define CP210X_SERIAL_AUTO_TRANSMIT BIT(0) 473#define CP210X_SERIAL_AUTO_RECEIVE BIT(1) 474#define CP210X_SERIAL_ERROR_CHAR BIT(2) 475#define CP210X_SERIAL_NULL_STRIPPING BIT(3) 476#define CP210X_SERIAL_BREAK_CHAR BIT(4) 477#define CP210X_SERIAL_RTS_MASK GENMASK(7, 6) 478#define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6) 479#define CP210X_SERIAL_XOFF_CONTINUE BIT(31) 480 481/* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */ 482#define CP210X_SERIAL_RTS_INACTIVE 0 483#define CP210X_SERIAL_RTS_ACTIVE 1 484#define CP210X_SERIAL_RTS_FLOW_CTL 2 485 486/* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */ 487struct cp210x_pin_mode { 488 u8 eci; 489 u8 sci; 490}; 491 492#define CP210X_PIN_MODE_MODEM 0 493#define CP210X_PIN_MODE_GPIO BIT(0) 494 495/* 496 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes 497 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes. 498 */ 499struct cp210x_dual_port_config { 500 __le16 gpio_mode; 501 u8 __pad0[2]; 502 __le16 reset_state; 503 u8 __pad1[4]; 504 __le16 suspend_state; 505 u8 sci_cfg; 506 u8 eci_cfg; 507 u8 device_cfg; 508} __packed; 509 510/* 511 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes 512 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes. 513 */ 514struct cp210x_single_port_config { 515 __le16 gpio_mode; 516 u8 __pad0[2]; 517 __le16 reset_state; 518 u8 __pad1[4]; 519 __le16 suspend_state; 520 u8 device_cfg; 521} __packed; 522 523/* GPIO modes */ 524#define CP210X_SCI_GPIO_MODE_OFFSET 9 525#define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9) 526 527#define CP210X_ECI_GPIO_MODE_OFFSET 2 528#define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2) 529 530#define CP210X_GPIO_MODE_OFFSET 8 531#define CP210X_GPIO_MODE_MASK GENMASK(11, 8) 532 533/* CP2105 port configuration values */ 534#define CP2105_GPIO0_TXLED_MODE BIT(0) 535#define CP2105_GPIO1_RXLED_MODE BIT(1) 536#define CP2105_GPIO1_RS485_MODE BIT(2) 537 538/* CP2104 port configuration values */ 539#define CP2104_GPIO0_TXLED_MODE BIT(0) 540#define CP2104_GPIO1_RXLED_MODE BIT(1) 541#define CP2104_GPIO2_RS485_MODE BIT(2) 542 543/* CP2102N configuration array indices */ 544#define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2 545#define CP210X_2NCONFIG_GPIO_MODE_IDX 581 546#define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587 547#define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600 548 549/* CP2102N QFN20 port configuration values */ 550#define CP2102N_QFN20_GPIO2_TXLED_MODE BIT(2) 551#define CP2102N_QFN20_GPIO3_RXLED_MODE BIT(3) 552#define CP2102N_QFN20_GPIO1_RS485_MODE BIT(4) 553#define CP2102N_QFN20_GPIO0_CLK_MODE BIT(6) 554 555/* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */ 556struct cp210x_gpio_write { 557 u8 mask; 558 u8 state; 559}; 560 561/* 562 * Helper to get interface number when we only have struct usb_serial. 563 */ 564static u8 cp210x_interface_num(struct usb_serial *serial) 565{ 566 struct usb_host_interface *cur_altsetting; 567 568 cur_altsetting = serial->interface->cur_altsetting; 569 570 return cur_altsetting->desc.bInterfaceNumber; 571} 572 573/* 574 * Reads a variable-sized block of CP210X_ registers, identified by req. 575 * Returns data into buf in native USB byte order. 576 */ 577static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, 578 void *buf, int bufsize) 579{ 580 struct usb_serial *serial = port->serial; 581 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 582 void *dmabuf; 583 int result; 584 585 dmabuf = kmalloc(bufsize, GFP_KERNEL); 586 if (!dmabuf) { 587 /* 588 * FIXME Some callers don't bother to check for error, 589 * at least give them consistent junk until they are fixed 590 */ 591 memset(buf, 0, bufsize); 592 return -ENOMEM; 593 } 594 595 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 596 req, REQTYPE_INTERFACE_TO_HOST, 0, 597 port_priv->bInterfaceNumber, dmabuf, bufsize, 598 USB_CTRL_SET_TIMEOUT); 599 if (result == bufsize) { 600 memcpy(buf, dmabuf, bufsize); 601 result = 0; 602 } else { 603 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", 604 req, bufsize, result); 605 if (result >= 0) 606 result = -EIO; 607 608 /* 609 * FIXME Some callers don't bother to check for error, 610 * at least give them consistent junk until they are fixed 611 */ 612 memset(buf, 0, bufsize); 613 } 614 615 kfree(dmabuf); 616 617 return result; 618} 619 620/* 621 * Reads any 32-bit CP210X_ register identified by req. 622 */ 623static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val) 624{ 625 __le32 le32_val; 626 int err; 627 628 err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val)); 629 if (err) { 630 /* 631 * FIXME Some callers don't bother to check for error, 632 * at least give them consistent junk until they are fixed 633 */ 634 *val = 0; 635 return err; 636 } 637 638 *val = le32_to_cpu(le32_val); 639 640 return 0; 641} 642 643/* 644 * Reads any 16-bit CP210X_ register identified by req. 645 */ 646static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val) 647{ 648 __le16 le16_val; 649 int err; 650 651 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val)); 652 if (err) 653 return err; 654 655 *val = le16_to_cpu(le16_val); 656 657 return 0; 658} 659 660/* 661 * Reads any 8-bit CP210X_ register identified by req. 662 */ 663static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val) 664{ 665 return cp210x_read_reg_block(port, req, val, sizeof(*val)); 666} 667 668/* 669 * Reads a variable-sized vendor block of CP210X_ registers, identified by val. 670 * Returns data into buf in native USB byte order. 671 */ 672static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val, 673 void *buf, int bufsize) 674{ 675 void *dmabuf; 676 int result; 677 678 dmabuf = kmalloc(bufsize, GFP_KERNEL); 679 if (!dmabuf) 680 return -ENOMEM; 681 682 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 683 CP210X_VENDOR_SPECIFIC, type, val, 684 cp210x_interface_num(serial), dmabuf, bufsize, 685 USB_CTRL_GET_TIMEOUT); 686 if (result == bufsize) { 687 memcpy(buf, dmabuf, bufsize); 688 result = 0; 689 } else { 690 dev_err(&serial->interface->dev, 691 "failed to get vendor val 0x%04x size %d: %d\n", val, 692 bufsize, result); 693 if (result >= 0) 694 result = -EIO; 695 } 696 697 kfree(dmabuf); 698 699 return result; 700} 701 702/* 703 * Writes any 16-bit CP210X_ register (req) whose value is passed 704 * entirely in the wValue field of the USB request. 705 */ 706static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) 707{ 708 struct usb_serial *serial = port->serial; 709 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 710 int result; 711 712 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 713 req, REQTYPE_HOST_TO_INTERFACE, val, 714 port_priv->bInterfaceNumber, NULL, 0, 715 USB_CTRL_SET_TIMEOUT); 716 if (result < 0) { 717 dev_err(&port->dev, "failed set request 0x%x status: %d\n", 718 req, result); 719 } 720 721 return result; 722} 723 724/* 725 * Writes a variable-sized block of CP210X_ registers, identified by req. 726 * Data in buf must be in native USB byte order. 727 */ 728static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req, 729 void *buf, int bufsize) 730{ 731 struct usb_serial *serial = port->serial; 732 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 733 void *dmabuf; 734 int result; 735 736 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 737 if (!dmabuf) 738 return -ENOMEM; 739 740 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 741 req, REQTYPE_HOST_TO_INTERFACE, 0, 742 port_priv->bInterfaceNumber, dmabuf, bufsize, 743 USB_CTRL_SET_TIMEOUT); 744 745 kfree(dmabuf); 746 747 if (result == bufsize) { 748 result = 0; 749 } else { 750 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", 751 req, bufsize, result); 752 if (result >= 0) 753 result = -EIO; 754 } 755 756 return result; 757} 758 759/* 760 * Writes any 32-bit CP210X_ register identified by req. 761 */ 762static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) 763{ 764 __le32 le32_val; 765 766 le32_val = cpu_to_le32(val); 767 768 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); 769} 770 771#ifdef CONFIG_GPIOLIB 772/* 773 * Writes a variable-sized vendor block of CP210X_ registers, identified by val. 774 * Data in buf must be in native USB byte order. 775 */ 776static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type, 777 u16 val, void *buf, int bufsize) 778{ 779 void *dmabuf; 780 int result; 781 782 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 783 if (!dmabuf) 784 return -ENOMEM; 785 786 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 787 CP210X_VENDOR_SPECIFIC, type, val, 788 cp210x_interface_num(serial), dmabuf, bufsize, 789 USB_CTRL_SET_TIMEOUT); 790 791 kfree(dmabuf); 792 793 if (result == bufsize) { 794 result = 0; 795 } else { 796 dev_err(&serial->interface->dev, 797 "failed to set vendor val 0x%04x size %d: %d\n", val, 798 bufsize, result); 799 if (result >= 0) 800 result = -EIO; 801 } 802 803 return result; 804} 805#endif 806 807/* 808 * Detect CP2108 GET_LINE_CTL bug and activate workaround. 809 * Write a known good value 0x800, read it back. 810 * If it comes back swapped the bug is detected. 811 * Preserve the original register value. 812 */ 813static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port) 814{ 815 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 816 u16 line_ctl_save; 817 u16 line_ctl_test; 818 int err; 819 820 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save); 821 if (err) 822 return err; 823 824 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800); 825 if (err) 826 return err; 827 828 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test); 829 if (err) 830 return err; 831 832 if (line_ctl_test == 8) { 833 port_priv->has_swapped_line_ctl = true; 834 line_ctl_save = swab16(line_ctl_save); 835 } 836 837 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save); 838} 839 840/* 841 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL) 842 * to workaround cp2108 bug and get correct value. 843 */ 844static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl) 845{ 846 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 847 int err; 848 849 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl); 850 if (err) 851 return err; 852 853 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */ 854 if (port_priv->has_swapped_line_ctl) 855 *ctl = swab16(*ctl); 856 857 return 0; 858} 859 860static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 861{ 862 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 863 int result; 864 865 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 866 if (result) { 867 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 868 return result; 869 } 870 871 /* Configure the termios structure */ 872 cp210x_get_termios(tty, port); 873 874 if (tty) { 875 /* The baud rate must be initialised on cp2104 */ 876 cp210x_change_speed(tty, port, NULL); 877 878 if (I_INPCK(tty)) 879 cp210x_enable_event_mode(port); 880 } 881 882 result = usb_serial_generic_open(tty, port); 883 if (result) 884 goto err_disable; 885 886 return 0; 887 888err_disable: 889 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 890 port_priv->event_mode = false; 891 892 return result; 893} 894 895static void cp210x_close(struct usb_serial_port *port) 896{ 897 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 898 899 usb_serial_generic_close(port); 900 901 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 902 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 903 904 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 905 906 /* Disabling the interface disables event-insertion mode. */ 907 port_priv->event_mode = false; 908} 909 910static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag) 911{ 912 if (lsr & CP210X_LSR_BREAK) { 913 port->icount.brk++; 914 *flag = TTY_BREAK; 915 } else if (lsr & CP210X_LSR_PARITY) { 916 port->icount.parity++; 917 *flag = TTY_PARITY; 918 } else if (lsr & CP210X_LSR_FRAME) { 919 port->icount.frame++; 920 *flag = TTY_FRAME; 921 } 922 923 if (lsr & CP210X_LSR_OVERRUN) { 924 port->icount.overrun++; 925 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); 926 } 927} 928 929static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag) 930{ 931 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 932 933 switch (port_priv->event_state) { 934 case ES_DATA: 935 if (*ch == CP210X_ESCCHAR) { 936 port_priv->event_state = ES_ESCAPE; 937 break; 938 } 939 return false; 940 case ES_ESCAPE: 941 switch (*ch) { 942 case 0: 943 dev_dbg(&port->dev, "%s - escape char\n", __func__); 944 *ch = CP210X_ESCCHAR; 945 port_priv->event_state = ES_DATA; 946 return false; 947 case 1: 948 port_priv->event_state = ES_LSR_DATA_0; 949 break; 950 case 2: 951 port_priv->event_state = ES_LSR; 952 break; 953 case 3: 954 port_priv->event_state = ES_MSR; 955 break; 956 default: 957 dev_err(&port->dev, "malformed event 0x%02x\n", *ch); 958 port_priv->event_state = ES_DATA; 959 break; 960 } 961 break; 962 case ES_LSR_DATA_0: 963 port_priv->lsr = *ch; 964 port_priv->event_state = ES_LSR_DATA_1; 965 break; 966 case ES_LSR_DATA_1: 967 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n", 968 __func__, port_priv->lsr, *ch); 969 cp210x_process_lsr(port, port_priv->lsr, flag); 970 port_priv->event_state = ES_DATA; 971 return false; 972 case ES_LSR: 973 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch); 974 port_priv->lsr = *ch; 975 cp210x_process_lsr(port, port_priv->lsr, flag); 976 port_priv->event_state = ES_DATA; 977 break; 978 case ES_MSR: 979 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch); 980 /* unimplemented */ 981 port_priv->event_state = ES_DATA; 982 break; 983 } 984 985 return true; 986} 987 988static void cp210x_process_read_urb(struct urb *urb) 989{ 990 struct usb_serial_port *port = urb->context; 991 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 992 unsigned char *ch = urb->transfer_buffer; 993 char flag; 994 int i; 995 996 if (!urb->actual_length) 997 return; 998 999 if (port_priv->event_mode) { 1000 for (i = 0; i < urb->actual_length; i++, ch++) { 1001 flag = TTY_NORMAL; 1002 1003 if (cp210x_process_char(port, ch, &flag)) 1004 continue; 1005 1006 tty_insert_flip_char(&port->port, *ch, flag); 1007 } 1008 } else { 1009 tty_insert_flip_string(&port->port, ch, urb->actual_length); 1010 } 1011 tty_flip_buffer_push(&port->port); 1012} 1013 1014/* 1015 * Read how many bytes are waiting in the TX queue. 1016 */ 1017static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 1018 u32 *count) 1019{ 1020 struct usb_serial *serial = port->serial; 1021 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1022 struct cp210x_comm_status *sts; 1023 int result; 1024 1025 sts = kmalloc(sizeof(*sts), GFP_KERNEL); 1026 if (!sts) 1027 return -ENOMEM; 1028 1029 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 1030 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST, 1031 0, port_priv->bInterfaceNumber, sts, sizeof(*sts), 1032 USB_CTRL_GET_TIMEOUT); 1033 if (result == sizeof(*sts)) { 1034 *count = le32_to_cpu(sts->ulAmountInOutQueue); 1035 result = 0; 1036 } else { 1037 dev_err(&port->dev, "failed to get comm status: %d\n", result); 1038 if (result >= 0) 1039 result = -EIO; 1040 } 1041 1042 kfree(sts); 1043 1044 return result; 1045} 1046 1047static bool cp210x_tx_empty(struct usb_serial_port *port) 1048{ 1049 int err; 1050 u32 count; 1051 1052 err = cp210x_get_tx_queue_byte_count(port, &count); 1053 if (err) 1054 return true; 1055 1056 return !count; 1057} 1058 1059/* 1060 * cp210x_get_termios 1061 * Reads the baud rate, data bits, parity, stop bits and flow control mode 1062 * from the device, corrects any unsupported values, and configures the 1063 * termios structure to reflect the state of the device 1064 */ 1065static void cp210x_get_termios(struct tty_struct *tty, 1066 struct usb_serial_port *port) 1067{ 1068 unsigned int baud; 1069 1070 if (tty) { 1071 cp210x_get_termios_port(tty->driver_data, 1072 &tty->termios.c_cflag, &baud); 1073 tty_encode_baud_rate(tty, baud, baud); 1074 } else { 1075 tcflag_t cflag; 1076 cflag = 0; 1077 cp210x_get_termios_port(port, &cflag, &baud); 1078 } 1079} 1080 1081/* 1082 * cp210x_get_termios_port 1083 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port. 1084 */ 1085static void cp210x_get_termios_port(struct usb_serial_port *port, 1086 tcflag_t *cflagp, unsigned int *baudp) 1087{ 1088 struct device *dev = &port->dev; 1089 tcflag_t cflag; 1090 struct cp210x_flow_ctl flow_ctl; 1091 u32 baud; 1092 u16 bits; 1093 u32 ctl_hs; 1094 u32 flow_repl; 1095 1096 cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud); 1097 1098 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud); 1099 *baudp = baud; 1100 1101 cflag = *cflagp; 1102 1103 cp210x_get_line_ctl(port, &bits); 1104 cflag &= ~CSIZE; 1105 switch (bits & BITS_DATA_MASK) { 1106 case BITS_DATA_5: 1107 dev_dbg(dev, "%s - data bits = 5\n", __func__); 1108 cflag |= CS5; 1109 break; 1110 case BITS_DATA_6: 1111 dev_dbg(dev, "%s - data bits = 6\n", __func__); 1112 cflag |= CS6; 1113 break; 1114 case BITS_DATA_7: 1115 dev_dbg(dev, "%s - data bits = 7\n", __func__); 1116 cflag |= CS7; 1117 break; 1118 case BITS_DATA_8: 1119 dev_dbg(dev, "%s - data bits = 8\n", __func__); 1120 cflag |= CS8; 1121 break; 1122 case BITS_DATA_9: 1123 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__); 1124 cflag |= CS8; 1125 bits &= ~BITS_DATA_MASK; 1126 bits |= BITS_DATA_8; 1127 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1128 break; 1129 default: 1130 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__); 1131 cflag |= CS8; 1132 bits &= ~BITS_DATA_MASK; 1133 bits |= BITS_DATA_8; 1134 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1135 break; 1136 } 1137 1138 switch (bits & BITS_PARITY_MASK) { 1139 case BITS_PARITY_NONE: 1140 dev_dbg(dev, "%s - parity = NONE\n", __func__); 1141 cflag &= ~PARENB; 1142 break; 1143 case BITS_PARITY_ODD: 1144 dev_dbg(dev, "%s - parity = ODD\n", __func__); 1145 cflag |= (PARENB|PARODD); 1146 break; 1147 case BITS_PARITY_EVEN: 1148 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 1149 cflag &= ~PARODD; 1150 cflag |= PARENB; 1151 break; 1152 case BITS_PARITY_MARK: 1153 dev_dbg(dev, "%s - parity = MARK\n", __func__); 1154 cflag |= (PARENB|PARODD|CMSPAR); 1155 break; 1156 case BITS_PARITY_SPACE: 1157 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 1158 cflag &= ~PARODD; 1159 cflag |= (PARENB|CMSPAR); 1160 break; 1161 default: 1162 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__); 1163 cflag &= ~PARENB; 1164 bits &= ~BITS_PARITY_MASK; 1165 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1166 break; 1167 } 1168 1169 cflag &= ~CSTOPB; 1170 switch (bits & BITS_STOP_MASK) { 1171 case BITS_STOP_1: 1172 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 1173 break; 1174 case BITS_STOP_1_5: 1175 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__); 1176 bits &= ~BITS_STOP_MASK; 1177 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1178 break; 1179 case BITS_STOP_2: 1180 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 1181 cflag |= CSTOPB; 1182 break; 1183 default: 1184 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__); 1185 bits &= ~BITS_STOP_MASK; 1186 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1187 break; 1188 } 1189 1190 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1191 sizeof(flow_ctl)); 1192 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1193 if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) { 1194 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 1195 /* 1196 * When the port is closed, the CP210x hardware disables 1197 * auto-RTS and RTS is deasserted but it leaves auto-CTS when 1198 * in hardware flow control mode. When re-opening the port, if 1199 * auto-CTS is enabled on the cp210x, then auto-RTS must be 1200 * re-enabled in the driver. 1201 */ 1202 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1203 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1204 flow_repl |= CP210X_SERIAL_RTS_SHIFT(CP210X_SERIAL_RTS_FLOW_CTL); 1205 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1206 cp210x_write_reg_block(port, 1207 CP210X_SET_FLOW, 1208 &flow_ctl, 1209 sizeof(flow_ctl)); 1210 1211 cflag |= CRTSCTS; 1212 } else { 1213 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 1214 cflag &= ~CRTSCTS; 1215 } 1216 1217 *cflagp = cflag; 1218} 1219 1220struct cp210x_rate { 1221 speed_t rate; 1222 speed_t high; 1223}; 1224 1225static const struct cp210x_rate cp210x_an205_table1[] = { 1226 { 300, 300 }, 1227 { 600, 600 }, 1228 { 1200, 1200 }, 1229 { 1800, 1800 }, 1230 { 2400, 2400 }, 1231 { 4000, 4000 }, 1232 { 4800, 4803 }, 1233 { 7200, 7207 }, 1234 { 9600, 9612 }, 1235 { 14400, 14428 }, 1236 { 16000, 16062 }, 1237 { 19200, 19250 }, 1238 { 28800, 28912 }, 1239 { 38400, 38601 }, 1240 { 51200, 51558 }, 1241 { 56000, 56280 }, 1242 { 57600, 58053 }, 1243 { 64000, 64111 }, 1244 { 76800, 77608 }, 1245 { 115200, 117028 }, 1246 { 128000, 129347 }, 1247 { 153600, 156868 }, 1248 { 230400, 237832 }, 1249 { 250000, 254234 }, 1250 { 256000, 273066 }, 1251 { 460800, 491520 }, 1252 { 500000, 567138 }, 1253 { 576000, 670254 }, 1254 { 921600, UINT_MAX } 1255}; 1256 1257/* 1258 * Quantises the baud rate as per AN205 Table 1 1259 */ 1260static speed_t cp210x_get_an205_rate(speed_t baud) 1261{ 1262 int i; 1263 1264 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) { 1265 if (baud <= cp210x_an205_table1[i].high) 1266 break; 1267 } 1268 1269 return cp210x_an205_table1[i].rate; 1270} 1271 1272static speed_t cp210x_get_actual_rate(speed_t baud) 1273{ 1274 unsigned int prescale = 1; 1275 unsigned int div; 1276 1277 if (baud <= 365) 1278 prescale = 4; 1279 1280 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud); 1281 baud = 48000000 / (2 * prescale * div); 1282 1283 return baud; 1284} 1285 1286/* 1287 * CP2101 supports the following baud rates: 1288 * 1289 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 1290 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 1291 * 1292 * CP2102 and CP2103 support the following additional rates: 1293 * 1294 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 1295 * 576000 1296 * 1297 * The device will map a requested rate to a supported one, but the result 1298 * of requests for rates greater than 1053257 is undefined (see AN205). 1299 * 1300 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 1301 * respectively, with an error less than 1%. The actual rates are determined 1302 * by 1303 * 1304 * div = round(freq / (2 x prescale x request)) 1305 * actual = freq / (2 x prescale x div) 1306 * 1307 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 1308 * or 1 otherwise. 1309 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 1310 * otherwise. 1311 */ 1312static void cp210x_change_speed(struct tty_struct *tty, 1313 struct usb_serial_port *port, struct ktermios *old_termios) 1314{ 1315 struct usb_serial *serial = port->serial; 1316 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1317 u32 baud; 1318 1319 /* 1320 * This maps the requested rate to the actual rate, a valid rate on 1321 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed]. 1322 * 1323 * NOTE: B0 is not implemented. 1324 */ 1325 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed); 1326 1327 if (priv->use_actual_rate) 1328 baud = cp210x_get_actual_rate(baud); 1329 else if (baud < 1000000) 1330 baud = cp210x_get_an205_rate(baud); 1331 1332 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 1333 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { 1334 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 1335 if (old_termios) 1336 baud = old_termios->c_ospeed; 1337 else 1338 baud = 9600; 1339 } 1340 1341 tty_encode_baud_rate(tty, baud, baud); 1342} 1343 1344static void cp210x_enable_event_mode(struct usb_serial_port *port) 1345{ 1346 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1347 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1348 int ret; 1349 1350 if (port_priv->event_mode) 1351 return; 1352 1353 if (priv->no_event_mode) 1354 return; 1355 1356 port_priv->event_state = ES_DATA; 1357 port_priv->event_mode = true; 1358 1359 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR); 1360 if (ret) { 1361 dev_err(&port->dev, "failed to enable events: %d\n", ret); 1362 port_priv->event_mode = false; 1363 } 1364} 1365 1366static void cp210x_disable_event_mode(struct usb_serial_port *port) 1367{ 1368 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1369 int ret; 1370 1371 if (!port_priv->event_mode) 1372 return; 1373 1374 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0); 1375 if (ret) { 1376 dev_err(&port->dev, "failed to disable events: %d\n", ret); 1377 return; 1378 } 1379 1380 port_priv->event_mode = false; 1381} 1382 1383static void cp210x_set_termios(struct tty_struct *tty, 1384 struct usb_serial_port *port, struct ktermios *old_termios) 1385{ 1386 struct device *dev = &port->dev; 1387 unsigned int cflag, old_cflag; 1388 u16 bits; 1389 1390 cflag = tty->termios.c_cflag; 1391 old_cflag = old_termios->c_cflag; 1392 1393 if (tty->termios.c_ospeed != old_termios->c_ospeed) 1394 cp210x_change_speed(tty, port, old_termios); 1395 1396 /* If the number of data bits is to be updated */ 1397 if ((cflag & CSIZE) != (old_cflag & CSIZE)) { 1398 cp210x_get_line_ctl(port, &bits); 1399 bits &= ~BITS_DATA_MASK; 1400 switch (cflag & CSIZE) { 1401 case CS5: 1402 bits |= BITS_DATA_5; 1403 dev_dbg(dev, "%s - data bits = 5\n", __func__); 1404 break; 1405 case CS6: 1406 bits |= BITS_DATA_6; 1407 dev_dbg(dev, "%s - data bits = 6\n", __func__); 1408 break; 1409 case CS7: 1410 bits |= BITS_DATA_7; 1411 dev_dbg(dev, "%s - data bits = 7\n", __func__); 1412 break; 1413 case CS8: 1414 default: 1415 bits |= BITS_DATA_8; 1416 dev_dbg(dev, "%s - data bits = 8\n", __func__); 1417 break; 1418 } 1419 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 1420 dev_dbg(dev, "Number of data bits requested not supported by device\n"); 1421 } 1422 1423 if ((cflag & (PARENB|PARODD|CMSPAR)) != 1424 (old_cflag & (PARENB|PARODD|CMSPAR))) { 1425 cp210x_get_line_ctl(port, &bits); 1426 bits &= ~BITS_PARITY_MASK; 1427 if (cflag & PARENB) { 1428 if (cflag & CMSPAR) { 1429 if (cflag & PARODD) { 1430 bits |= BITS_PARITY_MARK; 1431 dev_dbg(dev, "%s - parity = MARK\n", __func__); 1432 } else { 1433 bits |= BITS_PARITY_SPACE; 1434 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 1435 } 1436 } else { 1437 if (cflag & PARODD) { 1438 bits |= BITS_PARITY_ODD; 1439 dev_dbg(dev, "%s - parity = ODD\n", __func__); 1440 } else { 1441 bits |= BITS_PARITY_EVEN; 1442 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 1443 } 1444 } 1445 } 1446 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 1447 dev_dbg(dev, "Parity mode not supported by device\n"); 1448 } 1449 1450 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { 1451 cp210x_get_line_ctl(port, &bits); 1452 bits &= ~BITS_STOP_MASK; 1453 if (cflag & CSTOPB) { 1454 bits |= BITS_STOP_2; 1455 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 1456 } else { 1457 bits |= BITS_STOP_1; 1458 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 1459 } 1460 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 1461 dev_dbg(dev, "Number of stop bits requested not supported by device\n"); 1462 } 1463 1464 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 1465 struct cp210x_flow_ctl flow_ctl; 1466 u32 ctl_hs; 1467 u32 flow_repl; 1468 1469 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1470 sizeof(flow_ctl)); 1471 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1472 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1473 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n", 1474 __func__, ctl_hs, flow_repl); 1475 1476 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE; 1477 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE; 1478 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY; 1479 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1480 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE); 1481 if (cflag & CRTSCTS) { 1482 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE; 1483 1484 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1485 flow_repl |= CP210X_SERIAL_RTS_SHIFT( 1486 CP210X_SERIAL_RTS_FLOW_CTL); 1487 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 1488 } else { 1489 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE; 1490 1491 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1492 flow_repl |= CP210X_SERIAL_RTS_SHIFT( 1493 CP210X_SERIAL_RTS_ACTIVE); 1494 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 1495 } 1496 1497 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n", 1498 __func__, ctl_hs, flow_repl); 1499 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1500 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1501 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1502 sizeof(flow_ctl)); 1503 } 1504 1505 /* 1506 * Enable event-insertion mode only if input parity checking is 1507 * enabled for now. 1508 */ 1509 if (I_INPCK(tty)) 1510 cp210x_enable_event_mode(port); 1511 else 1512 cp210x_disable_event_mode(port); 1513} 1514 1515static int cp210x_tiocmset(struct tty_struct *tty, 1516 unsigned int set, unsigned int clear) 1517{ 1518 struct usb_serial_port *port = tty->driver_data; 1519 return cp210x_tiocmset_port(port, set, clear); 1520} 1521 1522static int cp210x_tiocmset_port(struct usb_serial_port *port, 1523 unsigned int set, unsigned int clear) 1524{ 1525 u16 control = 0; 1526 1527 if (set & TIOCM_RTS) { 1528 control |= CONTROL_RTS; 1529 control |= CONTROL_WRITE_RTS; 1530 } 1531 if (set & TIOCM_DTR) { 1532 control |= CONTROL_DTR; 1533 control |= CONTROL_WRITE_DTR; 1534 } 1535 if (clear & TIOCM_RTS) { 1536 control &= ~CONTROL_RTS; 1537 control |= CONTROL_WRITE_RTS; 1538 } 1539 if (clear & TIOCM_DTR) { 1540 control &= ~CONTROL_DTR; 1541 control |= CONTROL_WRITE_DTR; 1542 } 1543 1544 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control); 1545 1546 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1547} 1548 1549static void cp210x_dtr_rts(struct usb_serial_port *p, int on) 1550{ 1551 if (on) 1552 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0); 1553 else 1554 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS); 1555} 1556 1557static int cp210x_tiocmget(struct tty_struct *tty) 1558{ 1559 struct usb_serial_port *port = tty->driver_data; 1560 u8 control; 1561 int result; 1562 1563 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1564 if (result) 1565 return result; 1566 1567 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1568 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1569 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1570 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1571 |((control & CONTROL_RING)? TIOCM_RI : 0) 1572 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1573 1574 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control); 1575 1576 return result; 1577} 1578 1579static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 1580{ 1581 struct usb_serial_port *port = tty->driver_data; 1582 u16 state; 1583 1584 if (break_state == 0) 1585 state = BREAK_OFF; 1586 else 1587 state = BREAK_ON; 1588 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1589 state == BREAK_OFF ? "off" : "on"); 1590 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1591} 1592 1593#ifdef CONFIG_GPIOLIB 1594static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset) 1595{ 1596 struct usb_serial *serial = gpiochip_get_data(gc); 1597 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1598 1599 if (priv->gpio_altfunc & BIT(offset)) 1600 return -ENODEV; 1601 1602 return 0; 1603} 1604 1605static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio) 1606{ 1607 struct usb_serial *serial = gpiochip_get_data(gc); 1608 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1609 u8 req_type = REQTYPE_DEVICE_TO_HOST; 1610 int result; 1611 u8 buf; 1612 1613 if (priv->partnum == CP210X_PARTNUM_CP2105) 1614 req_type = REQTYPE_INTERFACE_TO_HOST; 1615 1616 result = usb_autopm_get_interface(serial->interface); 1617 if (result) 1618 return result; 1619 1620 result = cp210x_read_vendor_block(serial, req_type, 1621 CP210X_READ_LATCH, &buf, sizeof(buf)); 1622 usb_autopm_put_interface(serial->interface); 1623 if (result < 0) 1624 return result; 1625 1626 return !!(buf & BIT(gpio)); 1627} 1628 1629static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value) 1630{ 1631 struct usb_serial *serial = gpiochip_get_data(gc); 1632 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1633 struct cp210x_gpio_write buf; 1634 int result; 1635 1636 if (value == 1) 1637 buf.state = BIT(gpio); 1638 else 1639 buf.state = 0; 1640 1641 buf.mask = BIT(gpio); 1642 1643 result = usb_autopm_get_interface(serial->interface); 1644 if (result) 1645 goto out; 1646 1647 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1648 result = cp210x_write_vendor_block(serial, 1649 REQTYPE_HOST_TO_INTERFACE, 1650 CP210X_WRITE_LATCH, &buf, 1651 sizeof(buf)); 1652 } else { 1653 u16 wIndex = buf.state << 8 | buf.mask; 1654 1655 result = usb_control_msg(serial->dev, 1656 usb_sndctrlpipe(serial->dev, 0), 1657 CP210X_VENDOR_SPECIFIC, 1658 REQTYPE_HOST_TO_DEVICE, 1659 CP210X_WRITE_LATCH, 1660 wIndex, 1661 NULL, 0, USB_CTRL_SET_TIMEOUT); 1662 } 1663 1664 usb_autopm_put_interface(serial->interface); 1665out: 1666 if (result < 0) { 1667 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n", 1668 result); 1669 } 1670} 1671 1672static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio) 1673{ 1674 struct usb_serial *serial = gpiochip_get_data(gc); 1675 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1676 1677 return priv->gpio_input & BIT(gpio); 1678} 1679 1680static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio) 1681{ 1682 struct usb_serial *serial = gpiochip_get_data(gc); 1683 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1684 1685 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1686 /* hardware does not support an input mode */ 1687 return -ENOTSUPP; 1688 } 1689 1690 /* push-pull pins cannot be changed to be inputs */ 1691 if (priv->gpio_pushpull & BIT(gpio)) 1692 return -EINVAL; 1693 1694 /* make sure to release pin if it is being driven low */ 1695 cp210x_gpio_set(gc, gpio, 1); 1696 1697 priv->gpio_input |= BIT(gpio); 1698 1699 return 0; 1700} 1701 1702static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio, 1703 int value) 1704{ 1705 struct usb_serial *serial = gpiochip_get_data(gc); 1706 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1707 1708 priv->gpio_input &= ~BIT(gpio); 1709 cp210x_gpio_set(gc, gpio, value); 1710 1711 return 0; 1712} 1713 1714static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio, 1715 unsigned long config) 1716{ 1717 struct usb_serial *serial = gpiochip_get_data(gc); 1718 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1719 enum pin_config_param param = pinconf_to_config_param(config); 1720 1721 /* Succeed only if in correct mode (this can't be set at runtime) */ 1722 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) && 1723 (priv->gpio_pushpull & BIT(gpio))) 1724 return 0; 1725 1726 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) && 1727 !(priv->gpio_pushpull & BIT(gpio))) 1728 return 0; 1729 1730 return -ENOTSUPP; 1731} 1732 1733/* 1734 * This function is for configuring GPIO using shared pins, where other signals 1735 * are made unavailable by configuring the use of GPIO. This is believed to be 1736 * only applicable to the cp2105 at this point, the other devices supported by 1737 * this driver that provide GPIO do so in a way that does not impact other 1738 * signals and are thus expected to have very different initialisation. 1739 */ 1740static int cp2105_gpioconf_init(struct usb_serial *serial) 1741{ 1742 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1743 struct cp210x_pin_mode mode; 1744 struct cp210x_dual_port_config config; 1745 u8 intf_num = cp210x_interface_num(serial); 1746 u8 iface_config; 1747 int result; 1748 1749 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1750 CP210X_GET_DEVICEMODE, &mode, 1751 sizeof(mode)); 1752 if (result < 0) 1753 return result; 1754 1755 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1756 CP210X_GET_PORTCONFIG, &config, 1757 sizeof(config)); 1758 if (result < 0) 1759 return result; 1760 1761 /* 2 banks of GPIO - One for the pins taken from each serial port */ 1762 if (intf_num == 0) { 1763 priv->gc.ngpio = 2; 1764 1765 if (mode.eci == CP210X_PIN_MODE_MODEM) { 1766 /* mark all GPIOs of this interface as reserved */ 1767 priv->gpio_altfunc = 0xff; 1768 return 0; 1769 } 1770 1771 iface_config = config.eci_cfg; 1772 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1773 CP210X_ECI_GPIO_MODE_MASK) >> 1774 CP210X_ECI_GPIO_MODE_OFFSET); 1775 } else if (intf_num == 1) { 1776 priv->gc.ngpio = 3; 1777 1778 if (mode.sci == CP210X_PIN_MODE_MODEM) { 1779 /* mark all GPIOs of this interface as reserved */ 1780 priv->gpio_altfunc = 0xff; 1781 return 0; 1782 } 1783 1784 iface_config = config.sci_cfg; 1785 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1786 CP210X_SCI_GPIO_MODE_MASK) >> 1787 CP210X_SCI_GPIO_MODE_OFFSET); 1788 } else { 1789 return -ENODEV; 1790 } 1791 1792 /* mark all pins which are not in GPIO mode */ 1793 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */ 1794 priv->gpio_altfunc |= BIT(0); 1795 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */ 1796 CP2105_GPIO1_RS485_MODE)) 1797 priv->gpio_altfunc |= BIT(1); 1798 1799 /* driver implementation for CP2105 only supports outputs */ 1800 priv->gpio_input = 0; 1801 1802 return 0; 1803} 1804 1805static int cp2104_gpioconf_init(struct usb_serial *serial) 1806{ 1807 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1808 struct cp210x_single_port_config config; 1809 u8 iface_config; 1810 u8 gpio_latch; 1811 int result; 1812 u8 i; 1813 1814 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1815 CP210X_GET_PORTCONFIG, &config, 1816 sizeof(config)); 1817 if (result < 0) 1818 return result; 1819 1820 priv->gc.ngpio = 4; 1821 1822 iface_config = config.device_cfg; 1823 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1824 CP210X_GPIO_MODE_MASK) >> 1825 CP210X_GPIO_MODE_OFFSET); 1826 gpio_latch = (u8)((le16_to_cpu(config.reset_state) & 1827 CP210X_GPIO_MODE_MASK) >> 1828 CP210X_GPIO_MODE_OFFSET); 1829 1830 /* mark all pins which are not in GPIO mode */ 1831 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */ 1832 priv->gpio_altfunc |= BIT(0); 1833 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */ 1834 priv->gpio_altfunc |= BIT(1); 1835 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */ 1836 priv->gpio_altfunc |= BIT(2); 1837 1838 /* 1839 * Like CP2102N, CP2104 has also no strict input and output pin 1840 * modes. 1841 * Do the same input mode emulation as CP2102N. 1842 */ 1843 for (i = 0; i < priv->gc.ngpio; ++i) { 1844 /* 1845 * Set direction to "input" iff pin is open-drain and reset 1846 * value is 1. 1847 */ 1848 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1849 priv->gpio_input |= BIT(i); 1850 } 1851 1852 return 0; 1853} 1854 1855static int cp2102n_gpioconf_init(struct usb_serial *serial) 1856{ 1857 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1858 const u16 config_size = 0x02a6; 1859 u8 gpio_rst_latch; 1860 u8 config_version; 1861 u8 gpio_pushpull; 1862 u8 *config_buf; 1863 u8 gpio_latch; 1864 u8 gpio_ctrl; 1865 int result; 1866 u8 i; 1867 1868 /* 1869 * Retrieve device configuration from the device. 1870 * The array received contains all customization settings done at the 1871 * factory/manufacturer. Format of the array is documented at the 1872 * time of writing at: 1873 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa 1874 */ 1875 config_buf = kmalloc(config_size, GFP_KERNEL); 1876 if (!config_buf) 1877 return -ENOMEM; 1878 1879 result = cp210x_read_vendor_block(serial, 1880 REQTYPE_DEVICE_TO_HOST, 1881 CP210X_READ_2NCONFIG, 1882 config_buf, 1883 config_size); 1884 if (result < 0) { 1885 kfree(config_buf); 1886 return result; 1887 } 1888 1889 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX]; 1890 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX]; 1891 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX]; 1892 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX]; 1893 1894 kfree(config_buf); 1895 1896 /* Make sure this is a config format we understand. */ 1897 if (config_version != 0x01) 1898 return -ENOTSUPP; 1899 1900 priv->gc.ngpio = 4; 1901 1902 /* 1903 * Get default pin states after reset. Needed so we can determine 1904 * the direction of an open-drain pin. 1905 */ 1906 gpio_latch = (gpio_rst_latch >> 3) & 0x0f; 1907 1908 /* 0 indicates open-drain mode, 1 is push-pull */ 1909 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f; 1910 1911 /* 0 indicates GPIO mode, 1 is alternate function */ 1912 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) { 1913 /* QFN20 is special... */ 1914 if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE) /* GPIO 0 */ 1915 priv->gpio_altfunc |= BIT(0); 1916 if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */ 1917 priv->gpio_altfunc |= BIT(1); 1918 if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */ 1919 priv->gpio_altfunc |= BIT(2); 1920 if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */ 1921 priv->gpio_altfunc |= BIT(3); 1922 } else { 1923 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f; 1924 } 1925 1926 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) { 1927 /* 1928 * For the QFN28 package, GPIO4-6 are controlled by 1929 * the low three bits of the mode/latch fields. 1930 * Contrary to the document linked above, the bits for 1931 * the SUSPEND pins are elsewhere. No alternate 1932 * function is available for these pins. 1933 */ 1934 priv->gc.ngpio = 7; 1935 gpio_latch |= (gpio_rst_latch & 7) << 4; 1936 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4; 1937 } 1938 1939 /* 1940 * The CP2102N does not strictly has input and output pin modes, 1941 * it only knows open-drain and push-pull modes which is set at 1942 * factory. An open-drain pin can function both as an 1943 * input or an output. We emulate input mode for open-drain pins 1944 * by making sure they are not driven low, and we do not allow 1945 * push-pull pins to be set as an input. 1946 */ 1947 for (i = 0; i < priv->gc.ngpio; ++i) { 1948 /* 1949 * Set direction to "input" iff pin is open-drain and reset 1950 * value is 1. 1951 */ 1952 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1953 priv->gpio_input |= BIT(i); 1954 } 1955 1956 return 0; 1957} 1958 1959static int cp210x_gpio_init(struct usb_serial *serial) 1960{ 1961 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1962 int result; 1963 1964 switch (priv->partnum) { 1965 case CP210X_PARTNUM_CP2104: 1966 result = cp2104_gpioconf_init(serial); 1967 break; 1968 case CP210X_PARTNUM_CP2105: 1969 result = cp2105_gpioconf_init(serial); 1970 break; 1971 case CP210X_PARTNUM_CP2102N_QFN28: 1972 case CP210X_PARTNUM_CP2102N_QFN24: 1973 case CP210X_PARTNUM_CP2102N_QFN20: 1974 result = cp2102n_gpioconf_init(serial); 1975 break; 1976 default: 1977 return 0; 1978 } 1979 1980 if (result < 0) 1981 return result; 1982 1983 priv->gc.label = "cp210x"; 1984 priv->gc.request = cp210x_gpio_request; 1985 priv->gc.get_direction = cp210x_gpio_direction_get; 1986 priv->gc.direction_input = cp210x_gpio_direction_input; 1987 priv->gc.direction_output = cp210x_gpio_direction_output; 1988 priv->gc.get = cp210x_gpio_get; 1989 priv->gc.set = cp210x_gpio_set; 1990 priv->gc.set_config = cp210x_gpio_set_config; 1991 priv->gc.owner = THIS_MODULE; 1992 priv->gc.parent = &serial->interface->dev; 1993 priv->gc.base = -1; 1994 priv->gc.can_sleep = true; 1995 1996 result = gpiochip_add_data(&priv->gc, serial); 1997 if (!result) 1998 priv->gpio_registered = true; 1999 2000 return result; 2001} 2002 2003static void cp210x_gpio_remove(struct usb_serial *serial) 2004{ 2005 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2006 2007 if (priv->gpio_registered) { 2008 gpiochip_remove(&priv->gc); 2009 priv->gpio_registered = false; 2010 } 2011} 2012 2013#else 2014 2015static int cp210x_gpio_init(struct usb_serial *serial) 2016{ 2017 return 0; 2018} 2019 2020static void cp210x_gpio_remove(struct usb_serial *serial) 2021{ 2022 /* Nothing to do */ 2023} 2024 2025#endif 2026 2027static int cp210x_port_probe(struct usb_serial_port *port) 2028{ 2029 struct usb_serial *serial = port->serial; 2030 struct cp210x_port_private *port_priv; 2031 int ret; 2032 2033 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 2034 if (!port_priv) 2035 return -ENOMEM; 2036 2037 port_priv->bInterfaceNumber = cp210x_interface_num(serial); 2038 2039 usb_set_serial_port_data(port, port_priv); 2040 2041 ret = cp210x_detect_swapped_line_ctl(port); 2042 if (ret) { 2043 kfree(port_priv); 2044 return ret; 2045 } 2046 2047 return 0; 2048} 2049 2050static int cp210x_port_remove(struct usb_serial_port *port) 2051{ 2052 struct cp210x_port_private *port_priv; 2053 2054 port_priv = usb_get_serial_port_data(port); 2055 kfree(port_priv); 2056 2057 return 0; 2058} 2059 2060static void cp210x_init_max_speed(struct usb_serial *serial) 2061{ 2062 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2063 bool use_actual_rate = false; 2064 speed_t min = 300; 2065 speed_t max; 2066 2067 switch (priv->partnum) { 2068 case CP210X_PARTNUM_CP2101: 2069 max = 921600; 2070 break; 2071 case CP210X_PARTNUM_CP2102: 2072 case CP210X_PARTNUM_CP2103: 2073 max = 1000000; 2074 break; 2075 case CP210X_PARTNUM_CP2104: 2076 use_actual_rate = true; 2077 max = 2000000; 2078 break; 2079 case CP210X_PARTNUM_CP2108: 2080 max = 2000000; 2081 break; 2082 case CP210X_PARTNUM_CP2105: 2083 if (cp210x_interface_num(serial) == 0) { 2084 use_actual_rate = true; 2085 max = 2000000; /* ECI */ 2086 } else { 2087 min = 2400; 2088 max = 921600; /* SCI */ 2089 } 2090 break; 2091 case CP210X_PARTNUM_CP2102N_QFN28: 2092 case CP210X_PARTNUM_CP2102N_QFN24: 2093 case CP210X_PARTNUM_CP2102N_QFN20: 2094 use_actual_rate = true; 2095 max = 3000000; 2096 break; 2097 default: 2098 max = 2000000; 2099 break; 2100 } 2101 2102 priv->min_speed = min; 2103 priv->max_speed = max; 2104 priv->use_actual_rate = use_actual_rate; 2105} 2106 2107static void cp2102_determine_quirks(struct usb_serial *serial) 2108{ 2109 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2110 u8 *buf; 2111 int ret; 2112 2113 buf = kmalloc(2, GFP_KERNEL); 2114 if (!buf) 2115 return; 2116 /* 2117 * Some (possibly counterfeit) CP2102 do not support event-insertion 2118 * mode and respond differently to malformed vendor requests. 2119 * Specifically, they return one instead of two bytes when sent a 2120 * two-byte part-number request. 2121 */ 2122 ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 2123 CP210X_VENDOR_SPECIFIC, REQTYPE_DEVICE_TO_HOST, 2124 CP210X_GET_PARTNUM, 0, buf, 2, USB_CTRL_GET_TIMEOUT); 2125 if (ret == 1) { 2126 dev_dbg(&serial->interface->dev, 2127 "device does not support event-insertion mode\n"); 2128 priv->no_event_mode = true; 2129 } 2130 2131 kfree(buf); 2132} 2133 2134static void cp210x_determine_quirks(struct usb_serial *serial) 2135{ 2136 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2137 2138 switch (priv->partnum) { 2139 case CP210X_PARTNUM_CP2102: 2140 cp2102_determine_quirks(serial); 2141 break; 2142 default: 2143 break; 2144 } 2145} 2146 2147static int cp210x_attach(struct usb_serial *serial) 2148{ 2149 int result; 2150 struct cp210x_serial_private *priv; 2151 2152 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 2153 if (!priv) 2154 return -ENOMEM; 2155 2156 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 2157 CP210X_GET_PARTNUM, &priv->partnum, 2158 sizeof(priv->partnum)); 2159 if (result < 0) { 2160 dev_warn(&serial->interface->dev, 2161 "querying part number failed\n"); 2162 priv->partnum = CP210X_PARTNUM_UNKNOWN; 2163 } 2164 2165 usb_set_serial_data(serial, priv); 2166 2167 cp210x_determine_quirks(serial); 2168 cp210x_init_max_speed(serial); 2169 2170 result = cp210x_gpio_init(serial); 2171 if (result < 0) { 2172 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n", 2173 result); 2174 } 2175 2176 return 0; 2177} 2178 2179static void cp210x_disconnect(struct usb_serial *serial) 2180{ 2181 cp210x_gpio_remove(serial); 2182} 2183 2184static void cp210x_release(struct usb_serial *serial) 2185{ 2186 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2187 2188 cp210x_gpio_remove(serial); 2189 2190 kfree(priv); 2191} 2192 2193module_usb_serial_driver(serial_drivers, id_table); 2194 2195MODULE_DESCRIPTION(DRIVER_DESC); 2196MODULE_LICENSE("GPL v2"); 2197