1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Silicon Laboratories CP210x USB to RS232 serial adaptor driver 4 * 5 * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk) 6 * Copyright (C) 2010-2021 Johan Hovold (johan@kernel.org) 7 * 8 * Support to set flow control line levels using TIOCMGET and TIOCMSET 9 * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow 10 * control thanks to Munir Nassar nassarmu@real-time.com 11 * 12 */ 13 14 #include <linux/kernel.h> 15 #include <linux/errno.h> 16 #include <linux/slab.h> 17 #include <linux/tty.h> 18 #include <linux/tty_flip.h> 19 #include <linux/module.h> 20 #include <linux/usb.h> 21 #include <linux/usb/serial.h> 22 #include <linux/gpio/driver.h> 23 #include <linux/bitops.h> 24 #include <linux/mutex.h> 25 26 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver" 27 28 /* 29 * Function Prototypes 30 */ 31 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *); 32 static void cp210x_close(struct usb_serial_port *); 33 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *, 34 struct ktermios *); 35 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *, 36 struct ktermios*); 37 static bool cp210x_tx_empty(struct usb_serial_port *port); 38 static int cp210x_tiocmget(struct tty_struct *); 39 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int); 40 static int cp210x_tiocmset_port(struct usb_serial_port *port, 41 unsigned int, unsigned int); 42 static void cp210x_break_ctl(struct tty_struct *, int); 43 static int cp210x_attach(struct usb_serial *); 44 static void cp210x_disconnect(struct usb_serial *); 45 static void cp210x_release(struct usb_serial *); 46 static int cp210x_port_probe(struct usb_serial_port *); 47 static void cp210x_port_remove(struct usb_serial_port *); 48 static void cp210x_dtr_rts(struct usb_serial_port *port, int on); 49 static void cp210x_process_read_urb(struct urb *urb); 50 static void cp210x_enable_event_mode(struct usb_serial_port *port); 51 static void cp210x_disable_event_mode(struct usb_serial_port *port); 52 53 static const struct usb_device_id id_table[] = { 54 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */ 55 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */ 56 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 57 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 58 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */ 59 { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */ 60 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */ 61 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */ 62 { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */ 63 { USB_DEVICE(0x0988, 0x0578) }, /* Teraoka AD2000 */ 64 { USB_DEVICE(0x0B00, 0x3070) }, /* Ingenico 3070 */ 65 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */ 66 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */ 67 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */ 68 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */ 69 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */ 70 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */ 71 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */ 72 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */ 73 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */ 74 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */ 75 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */ 76 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */ 77 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */ 78 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */ 79 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */ 80 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */ 81 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */ 82 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */ 83 { USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */ 84 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */ 85 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */ 86 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */ 87 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */ 88 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */ 89 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */ 90 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */ 91 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */ 92 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */ 93 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */ 94 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */ 95 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */ 96 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */ 97 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */ 98 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */ 99 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */ 100 { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */ 101 { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */ 102 { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */ 103 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */ 104 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */ 105 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */ 106 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */ 107 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */ 108 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */ 109 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */ 110 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */ 111 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */ 112 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */ 113 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */ 114 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */ 115 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */ 116 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */ 117 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */ 118 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */ 119 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */ 120 { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */ 121 { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */ 122 { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */ 123 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */ 124 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */ 125 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */ 126 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */ 127 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */ 128 { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */ 129 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */ 130 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ 131 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ 132 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 133 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */ 134 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ 135 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */ 136 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */ 137 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */ 138 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */ 139 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ 140 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ 141 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */ 142 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 143 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 144 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */ 145 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */ 146 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */ 147 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */ 148 { USB_DEVICE(0x10C4, 0x88D8) }, /* Acuity Brands nLight Air Adapter */ 149 { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */ 150 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */ 151 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */ 152 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */ 153 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */ 154 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */ 155 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */ 156 { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */ 157 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */ 158 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */ 159 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */ 160 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 161 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 162 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */ 163 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 164 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 165 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */ 166 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */ 167 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 168 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 169 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 170 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 171 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 172 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 173 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */ 174 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */ 175 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 176 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 177 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */ 178 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */ 179 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */ 180 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 181 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */ 182 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */ 183 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */ 184 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */ 185 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */ 186 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */ 187 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 188 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ 189 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ 190 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ 191 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ 192 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ 193 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ 194 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 195 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 196 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 197 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */ 198 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */ 199 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */ 200 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */ 201 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */ 202 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */ 203 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */ 204 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */ 205 { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 Display serial interface */ 206 { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 M.2 Key E serial interface */ 207 { USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */ 208 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */ 209 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */ 210 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */ 211 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */ 212 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 213 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */ 214 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 215 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 216 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 217 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 218 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 219 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 220 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 221 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 222 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 223 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 224 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 225 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 226 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 227 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 228 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 229 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 230 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 231 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 232 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 233 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 234 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 235 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */ 236 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 237 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 238 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 239 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */ 240 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 241 { } /* Terminating Entry */ 242 }; 243 244 MODULE_DEVICE_TABLE(usb, id_table); 245 246 struct cp210x_serial_private { 247 #ifdef CONFIG_GPIOLIB 248 struct gpio_chip gc; 249 bool gpio_registered; 250 u8 gpio_pushpull; 251 u8 gpio_altfunc; 252 u8 gpio_input; 253 #endif 254 u8 partnum; 255 u32 fw_version; 256 speed_t min_speed; 257 speed_t max_speed; 258 bool use_actual_rate; 259 bool no_flow_control; 260 }; 261 262 enum cp210x_event_state { 263 ES_DATA, 264 ES_ESCAPE, 265 ES_LSR, 266 ES_LSR_DATA_0, 267 ES_LSR_DATA_1, 268 ES_MSR 269 }; 270 271 struct cp210x_port_private { 272 u8 bInterfaceNumber; 273 bool event_mode; 274 enum cp210x_event_state event_state; 275 u8 lsr; 276 277 struct mutex mutex; 278 bool crtscts; 279 bool dtr; 280 bool rts; 281 }; 282 283 static struct usb_serial_driver cp210x_device = { 284 .driver = { 285 .owner = THIS_MODULE, 286 .name = "cp210x", 287 }, 288 .id_table = id_table, 289 .num_ports = 1, 290 .bulk_in_size = 256, 291 .bulk_out_size = 256, 292 .open = cp210x_open, 293 .close = cp210x_close, 294 .break_ctl = cp210x_break_ctl, 295 .set_termios = cp210x_set_termios, 296 .tx_empty = cp210x_tx_empty, 297 .throttle = usb_serial_generic_throttle, 298 .unthrottle = usb_serial_generic_unthrottle, 299 .tiocmget = cp210x_tiocmget, 300 .tiocmset = cp210x_tiocmset, 301 .get_icount = usb_serial_generic_get_icount, 302 .attach = cp210x_attach, 303 .disconnect = cp210x_disconnect, 304 .release = cp210x_release, 305 .port_probe = cp210x_port_probe, 306 .port_remove = cp210x_port_remove, 307 .dtr_rts = cp210x_dtr_rts, 308 .process_read_urb = cp210x_process_read_urb, 309 }; 310 311 static struct usb_serial_driver * const serial_drivers[] = { 312 &cp210x_device, NULL 313 }; 314 315 /* Config request types */ 316 #define REQTYPE_HOST_TO_INTERFACE 0x41 317 #define REQTYPE_INTERFACE_TO_HOST 0xc1 318 #define REQTYPE_HOST_TO_DEVICE 0x40 319 #define REQTYPE_DEVICE_TO_HOST 0xc0 320 321 /* Config request codes */ 322 #define CP210X_IFC_ENABLE 0x00 323 #define CP210X_SET_BAUDDIV 0x01 324 #define CP210X_GET_BAUDDIV 0x02 325 #define CP210X_SET_LINE_CTL 0x03 326 #define CP210X_GET_LINE_CTL 0x04 327 #define CP210X_SET_BREAK 0x05 328 #define CP210X_IMM_CHAR 0x06 329 #define CP210X_SET_MHS 0x07 330 #define CP210X_GET_MDMSTS 0x08 331 #define CP210X_SET_XON 0x09 332 #define CP210X_SET_XOFF 0x0A 333 #define CP210X_SET_EVENTMASK 0x0B 334 #define CP210X_GET_EVENTMASK 0x0C 335 #define CP210X_SET_CHAR 0x0D 336 #define CP210X_GET_CHARS 0x0E 337 #define CP210X_GET_PROPS 0x0F 338 #define CP210X_GET_COMM_STATUS 0x10 339 #define CP210X_RESET 0x11 340 #define CP210X_PURGE 0x12 341 #define CP210X_SET_FLOW 0x13 342 #define CP210X_GET_FLOW 0x14 343 #define CP210X_EMBED_EVENTS 0x15 344 #define CP210X_GET_EVENTSTATE 0x16 345 #define CP210X_SET_CHARS 0x19 346 #define CP210X_GET_BAUDRATE 0x1D 347 #define CP210X_SET_BAUDRATE 0x1E 348 #define CP210X_VENDOR_SPECIFIC 0xFF 349 350 /* CP210X_IFC_ENABLE */ 351 #define UART_ENABLE 0x0001 352 #define UART_DISABLE 0x0000 353 354 /* CP210X_(SET|GET)_BAUDDIV */ 355 #define BAUD_RATE_GEN_FREQ 0x384000 356 357 /* CP210X_(SET|GET)_LINE_CTL */ 358 #define BITS_DATA_MASK 0X0f00 359 #define BITS_DATA_5 0X0500 360 #define BITS_DATA_6 0X0600 361 #define BITS_DATA_7 0X0700 362 #define BITS_DATA_8 0X0800 363 #define BITS_DATA_9 0X0900 364 365 #define BITS_PARITY_MASK 0x00f0 366 #define BITS_PARITY_NONE 0x0000 367 #define BITS_PARITY_ODD 0x0010 368 #define BITS_PARITY_EVEN 0x0020 369 #define BITS_PARITY_MARK 0x0030 370 #define BITS_PARITY_SPACE 0x0040 371 372 #define BITS_STOP_MASK 0x000f 373 #define BITS_STOP_1 0x0000 374 #define BITS_STOP_1_5 0x0001 375 #define BITS_STOP_2 0x0002 376 377 /* CP210X_SET_BREAK */ 378 #define BREAK_ON 0x0001 379 #define BREAK_OFF 0x0000 380 381 /* CP210X_(SET_MHS|GET_MDMSTS) */ 382 #define CONTROL_DTR 0x0001 383 #define CONTROL_RTS 0x0002 384 #define CONTROL_CTS 0x0010 385 #define CONTROL_DSR 0x0020 386 #define CONTROL_RING 0x0040 387 #define CONTROL_DCD 0x0080 388 #define CONTROL_WRITE_DTR 0x0100 389 #define CONTROL_WRITE_RTS 0x0200 390 391 /* CP210X_(GET|SET)_CHARS */ 392 struct cp210x_special_chars { 393 u8 bEofChar; 394 u8 bErrorChar; 395 u8 bBreakChar; 396 u8 bEventChar; 397 u8 bXonChar; 398 u8 bXoffChar; 399 }; 400 401 /* CP210X_VENDOR_SPECIFIC values */ 402 #define CP210X_READ_2NCONFIG 0x000E 403 #define CP210X_GET_FW_VER_2N 0x0010 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 */ 423 struct 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 */ 451 struct 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_INACTIVE (0 << 0) 461 #define CP210X_SERIAL_DTR_ACTIVE (1 << 0) 462 #define CP210X_SERIAL_DTR_FLOW_CTL (2 << 0) 463 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3) 464 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4) 465 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5) 466 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6) 467 468 /* cp210x_flow_ctl::ulFlowReplace */ 469 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0) 470 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1) 471 #define CP210X_SERIAL_ERROR_CHAR BIT(2) 472 #define CP210X_SERIAL_NULL_STRIPPING BIT(3) 473 #define CP210X_SERIAL_BREAK_CHAR BIT(4) 474 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6) 475 #define CP210X_SERIAL_RTS_INACTIVE (0 << 6) 476 #define CP210X_SERIAL_RTS_ACTIVE (1 << 6) 477 #define CP210X_SERIAL_RTS_FLOW_CTL (2 << 6) 478 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31) 479 480 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */ 481 struct cp210x_pin_mode { 482 u8 eci; 483 u8 sci; 484 }; 485 486 #define CP210X_PIN_MODE_MODEM 0 487 #define CP210X_PIN_MODE_GPIO BIT(0) 488 489 /* 490 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes 491 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes. 492 */ 493 struct cp210x_dual_port_config { 494 __le16 gpio_mode; 495 u8 __pad0[2]; 496 __le16 reset_state; 497 u8 __pad1[4]; 498 __le16 suspend_state; 499 u8 sci_cfg; 500 u8 eci_cfg; 501 u8 device_cfg; 502 } __packed; 503 504 /* 505 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes 506 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes. 507 */ 508 struct cp210x_single_port_config { 509 __le16 gpio_mode; 510 u8 __pad0[2]; 511 __le16 reset_state; 512 u8 __pad1[4]; 513 __le16 suspend_state; 514 u8 device_cfg; 515 } __packed; 516 517 /* GPIO modes */ 518 #define CP210X_SCI_GPIO_MODE_OFFSET 9 519 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9) 520 521 #define CP210X_ECI_GPIO_MODE_OFFSET 2 522 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2) 523 524 #define CP210X_GPIO_MODE_OFFSET 8 525 #define CP210X_GPIO_MODE_MASK GENMASK(11, 8) 526 527 /* CP2105 port configuration values */ 528 #define CP2105_GPIO0_TXLED_MODE BIT(0) 529 #define CP2105_GPIO1_RXLED_MODE BIT(1) 530 #define CP2105_GPIO1_RS485_MODE BIT(2) 531 532 /* CP2104 port configuration values */ 533 #define CP2104_GPIO0_TXLED_MODE BIT(0) 534 #define CP2104_GPIO1_RXLED_MODE BIT(1) 535 #define CP2104_GPIO2_RS485_MODE BIT(2) 536 537 /* CP2102N configuration array indices */ 538 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2 539 #define CP210X_2NCONFIG_GPIO_MODE_IDX 581 540 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587 541 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600 542 543 /* CP2102N QFN20 port configuration values */ 544 #define CP2102N_QFN20_GPIO2_TXLED_MODE BIT(2) 545 #define CP2102N_QFN20_GPIO3_RXLED_MODE BIT(3) 546 #define CP2102N_QFN20_GPIO1_RS485_MODE BIT(4) 547 #define CP2102N_QFN20_GPIO0_CLK_MODE BIT(6) 548 549 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */ 550 struct cp210x_gpio_write { 551 u8 mask; 552 u8 state; 553 }; 554 555 /* 556 * Helper to get interface number when we only have struct usb_serial. 557 */ 558 static u8 cp210x_interface_num(struct usb_serial *serial) 559 { 560 struct usb_host_interface *cur_altsetting; 561 562 cur_altsetting = serial->interface->cur_altsetting; 563 564 return cur_altsetting->desc.bInterfaceNumber; 565 } 566 567 /* 568 * Reads a variable-sized block of CP210X_ registers, identified by req. 569 * Returns data into buf in native USB byte order. 570 */ 571 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, 572 void *buf, int bufsize) 573 { 574 struct usb_serial *serial = port->serial; 575 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 576 void *dmabuf; 577 int result; 578 579 dmabuf = kmalloc(bufsize, GFP_KERNEL); 580 if (!dmabuf) 581 return -ENOMEM; 582 583 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 584 req, REQTYPE_INTERFACE_TO_HOST, 0, 585 port_priv->bInterfaceNumber, dmabuf, bufsize, 586 USB_CTRL_SET_TIMEOUT); 587 if (result == bufsize) { 588 memcpy(buf, dmabuf, bufsize); 589 result = 0; 590 } else { 591 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", 592 req, bufsize, result); 593 if (result >= 0) 594 result = -EIO; 595 } 596 597 kfree(dmabuf); 598 599 return result; 600 } 601 602 /* 603 * Reads any 8-bit CP210X_ register identified by req. 604 */ 605 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val) 606 { 607 return cp210x_read_reg_block(port, req, val, sizeof(*val)); 608 } 609 610 /* 611 * Reads a variable-sized vendor block of CP210X_ registers, identified by val. 612 * Returns data into buf in native USB byte order. 613 */ 614 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val, 615 void *buf, int bufsize) 616 { 617 void *dmabuf; 618 int result; 619 620 dmabuf = kmalloc(bufsize, GFP_KERNEL); 621 if (!dmabuf) 622 return -ENOMEM; 623 624 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 625 CP210X_VENDOR_SPECIFIC, type, val, 626 cp210x_interface_num(serial), dmabuf, bufsize, 627 USB_CTRL_GET_TIMEOUT); 628 if (result == bufsize) { 629 memcpy(buf, dmabuf, bufsize); 630 result = 0; 631 } else { 632 dev_err(&serial->interface->dev, 633 "failed to get vendor val 0x%04x size %d: %d\n", val, 634 bufsize, result); 635 if (result >= 0) 636 result = -EIO; 637 } 638 639 kfree(dmabuf); 640 641 return result; 642 } 643 644 /* 645 * Writes any 16-bit CP210X_ register (req) whose value is passed 646 * entirely in the wValue field of the USB request. 647 */ 648 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) 649 { 650 struct usb_serial *serial = port->serial; 651 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 652 int result; 653 654 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 655 req, REQTYPE_HOST_TO_INTERFACE, val, 656 port_priv->bInterfaceNumber, NULL, 0, 657 USB_CTRL_SET_TIMEOUT); 658 if (result < 0) { 659 dev_err(&port->dev, "failed set request 0x%x status: %d\n", 660 req, result); 661 } 662 663 return result; 664 } 665 666 /* 667 * Writes a variable-sized block of CP210X_ registers, identified by req. 668 * Data in buf must be in native USB byte order. 669 */ 670 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req, 671 void *buf, int bufsize) 672 { 673 struct usb_serial *serial = port->serial; 674 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 675 void *dmabuf; 676 int result; 677 678 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 679 if (!dmabuf) 680 return -ENOMEM; 681 682 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 683 req, REQTYPE_HOST_TO_INTERFACE, 0, 684 port_priv->bInterfaceNumber, dmabuf, bufsize, 685 USB_CTRL_SET_TIMEOUT); 686 687 kfree(dmabuf); 688 689 if (result < 0) { 690 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", 691 req, bufsize, result); 692 return result; 693 } 694 695 return 0; 696 } 697 698 /* 699 * Writes any 32-bit CP210X_ register identified by req. 700 */ 701 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) 702 { 703 __le32 le32_val; 704 705 le32_val = cpu_to_le32(val); 706 707 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); 708 } 709 710 #ifdef CONFIG_GPIOLIB 711 /* 712 * Writes a variable-sized vendor block of CP210X_ registers, identified by val. 713 * Data in buf must be in native USB byte order. 714 */ 715 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type, 716 u16 val, void *buf, int bufsize) 717 { 718 void *dmabuf; 719 int result; 720 721 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 722 if (!dmabuf) 723 return -ENOMEM; 724 725 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 726 CP210X_VENDOR_SPECIFIC, type, val, 727 cp210x_interface_num(serial), dmabuf, bufsize, 728 USB_CTRL_SET_TIMEOUT); 729 730 kfree(dmabuf); 731 732 if (result < 0) { 733 dev_err(&serial->interface->dev, 734 "failed to set vendor val 0x%04x size %d: %d\n", val, 735 bufsize, result); 736 return result; 737 } 738 739 return 0; 740 } 741 #endif 742 743 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 744 { 745 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 746 int result; 747 748 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 749 if (result) { 750 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 751 return result; 752 } 753 754 if (tty) 755 cp210x_set_termios(tty, port, NULL); 756 757 result = usb_serial_generic_open(tty, port); 758 if (result) 759 goto err_disable; 760 761 return 0; 762 763 err_disable: 764 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 765 port_priv->event_mode = false; 766 767 return result; 768 } 769 770 static void cp210x_close(struct usb_serial_port *port) 771 { 772 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 773 774 usb_serial_generic_close(port); 775 776 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 777 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 778 779 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 780 781 /* Disabling the interface disables event-insertion mode. */ 782 port_priv->event_mode = false; 783 } 784 785 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag) 786 { 787 if (lsr & CP210X_LSR_BREAK) { 788 port->icount.brk++; 789 *flag = TTY_BREAK; 790 } else if (lsr & CP210X_LSR_PARITY) { 791 port->icount.parity++; 792 *flag = TTY_PARITY; 793 } else if (lsr & CP210X_LSR_FRAME) { 794 port->icount.frame++; 795 *flag = TTY_FRAME; 796 } 797 798 if (lsr & CP210X_LSR_OVERRUN) { 799 port->icount.overrun++; 800 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); 801 } 802 } 803 804 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag) 805 { 806 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 807 808 switch (port_priv->event_state) { 809 case ES_DATA: 810 if (*ch == CP210X_ESCCHAR) { 811 port_priv->event_state = ES_ESCAPE; 812 break; 813 } 814 return false; 815 case ES_ESCAPE: 816 switch (*ch) { 817 case 0: 818 dev_dbg(&port->dev, "%s - escape char\n", __func__); 819 *ch = CP210X_ESCCHAR; 820 port_priv->event_state = ES_DATA; 821 return false; 822 case 1: 823 port_priv->event_state = ES_LSR_DATA_0; 824 break; 825 case 2: 826 port_priv->event_state = ES_LSR; 827 break; 828 case 3: 829 port_priv->event_state = ES_MSR; 830 break; 831 default: 832 dev_err(&port->dev, "malformed event 0x%02x\n", *ch); 833 port_priv->event_state = ES_DATA; 834 break; 835 } 836 break; 837 case ES_LSR_DATA_0: 838 port_priv->lsr = *ch; 839 port_priv->event_state = ES_LSR_DATA_1; 840 break; 841 case ES_LSR_DATA_1: 842 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n", 843 __func__, port_priv->lsr, *ch); 844 cp210x_process_lsr(port, port_priv->lsr, flag); 845 port_priv->event_state = ES_DATA; 846 return false; 847 case ES_LSR: 848 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch); 849 port_priv->lsr = *ch; 850 cp210x_process_lsr(port, port_priv->lsr, flag); 851 port_priv->event_state = ES_DATA; 852 break; 853 case ES_MSR: 854 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch); 855 /* unimplemented */ 856 port_priv->event_state = ES_DATA; 857 break; 858 } 859 860 return true; 861 } 862 863 static void cp210x_process_read_urb(struct urb *urb) 864 { 865 struct usb_serial_port *port = urb->context; 866 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 867 unsigned char *ch = urb->transfer_buffer; 868 char flag; 869 int i; 870 871 if (!urb->actual_length) 872 return; 873 874 if (port_priv->event_mode) { 875 for (i = 0; i < urb->actual_length; i++, ch++) { 876 flag = TTY_NORMAL; 877 878 if (cp210x_process_char(port, ch, &flag)) 879 continue; 880 881 tty_insert_flip_char(&port->port, *ch, flag); 882 } 883 } else { 884 tty_insert_flip_string(&port->port, ch, urb->actual_length); 885 } 886 tty_flip_buffer_push(&port->port); 887 } 888 889 /* 890 * Read how many bytes are waiting in the TX queue. 891 */ 892 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 893 u32 *count) 894 { 895 struct usb_serial *serial = port->serial; 896 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 897 struct cp210x_comm_status *sts; 898 int result; 899 900 sts = kmalloc(sizeof(*sts), GFP_KERNEL); 901 if (!sts) 902 return -ENOMEM; 903 904 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 905 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST, 906 0, port_priv->bInterfaceNumber, sts, sizeof(*sts), 907 USB_CTRL_GET_TIMEOUT); 908 if (result == sizeof(*sts)) { 909 *count = le32_to_cpu(sts->ulAmountInOutQueue); 910 result = 0; 911 } else { 912 dev_err(&port->dev, "failed to get comm status: %d\n", result); 913 if (result >= 0) 914 result = -EIO; 915 } 916 917 kfree(sts); 918 919 return result; 920 } 921 922 static bool cp210x_tx_empty(struct usb_serial_port *port) 923 { 924 int err; 925 u32 count; 926 927 err = cp210x_get_tx_queue_byte_count(port, &count); 928 if (err) 929 return true; 930 931 return !count; 932 } 933 934 struct cp210x_rate { 935 speed_t rate; 936 speed_t high; 937 }; 938 939 static const struct cp210x_rate cp210x_an205_table1[] = { 940 { 300, 300 }, 941 { 600, 600 }, 942 { 1200, 1200 }, 943 { 1800, 1800 }, 944 { 2400, 2400 }, 945 { 4000, 4000 }, 946 { 4800, 4803 }, 947 { 7200, 7207 }, 948 { 9600, 9612 }, 949 { 14400, 14428 }, 950 { 16000, 16062 }, 951 { 19200, 19250 }, 952 { 28800, 28912 }, 953 { 38400, 38601 }, 954 { 51200, 51558 }, 955 { 56000, 56280 }, 956 { 57600, 58053 }, 957 { 64000, 64111 }, 958 { 76800, 77608 }, 959 { 115200, 117028 }, 960 { 128000, 129347 }, 961 { 153600, 156868 }, 962 { 230400, 237832 }, 963 { 250000, 254234 }, 964 { 256000, 273066 }, 965 { 460800, 491520 }, 966 { 500000, 567138 }, 967 { 576000, 670254 }, 968 { 921600, UINT_MAX } 969 }; 970 971 /* 972 * Quantises the baud rate as per AN205 Table 1 973 */ 974 static speed_t cp210x_get_an205_rate(speed_t baud) 975 { 976 int i; 977 978 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) { 979 if (baud <= cp210x_an205_table1[i].high) 980 break; 981 } 982 983 return cp210x_an205_table1[i].rate; 984 } 985 986 static speed_t cp210x_get_actual_rate(speed_t baud) 987 { 988 unsigned int prescale = 1; 989 unsigned int div; 990 991 if (baud <= 365) 992 prescale = 4; 993 994 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud); 995 baud = 48000000 / (2 * prescale * div); 996 997 return baud; 998 } 999 1000 /* 1001 * CP2101 supports the following baud rates: 1002 * 1003 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 1004 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 1005 * 1006 * CP2102 and CP2103 support the following additional rates: 1007 * 1008 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 1009 * 576000 1010 * 1011 * The device will map a requested rate to a supported one, but the result 1012 * of requests for rates greater than 1053257 is undefined (see AN205). 1013 * 1014 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 1015 * respectively, with an error less than 1%. The actual rates are determined 1016 * by 1017 * 1018 * div = round(freq / (2 x prescale x request)) 1019 * actual = freq / (2 x prescale x div) 1020 * 1021 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 1022 * or 1 otherwise. 1023 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 1024 * otherwise. 1025 */ 1026 static void cp210x_change_speed(struct tty_struct *tty, 1027 struct usb_serial_port *port, struct ktermios *old_termios) 1028 { 1029 struct usb_serial *serial = port->serial; 1030 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1031 u32 baud; 1032 1033 /* 1034 * This maps the requested rate to the actual rate, a valid rate on 1035 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed]. 1036 * 1037 * NOTE: B0 is not implemented. 1038 */ 1039 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed); 1040 1041 if (priv->use_actual_rate) 1042 baud = cp210x_get_actual_rate(baud); 1043 else if (baud < 1000000) 1044 baud = cp210x_get_an205_rate(baud); 1045 1046 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 1047 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { 1048 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 1049 if (old_termios) 1050 baud = old_termios->c_ospeed; 1051 else 1052 baud = 9600; 1053 } 1054 1055 tty_encode_baud_rate(tty, baud, baud); 1056 } 1057 1058 static void cp210x_enable_event_mode(struct usb_serial_port *port) 1059 { 1060 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1061 int ret; 1062 1063 if (port_priv->event_mode) 1064 return; 1065 1066 port_priv->event_state = ES_DATA; 1067 port_priv->event_mode = true; 1068 1069 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR); 1070 if (ret) { 1071 dev_err(&port->dev, "failed to enable events: %d\n", ret); 1072 port_priv->event_mode = false; 1073 } 1074 } 1075 1076 static void cp210x_disable_event_mode(struct usb_serial_port *port) 1077 { 1078 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1079 int ret; 1080 1081 if (!port_priv->event_mode) 1082 return; 1083 1084 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0); 1085 if (ret) { 1086 dev_err(&port->dev, "failed to disable events: %d\n", ret); 1087 return; 1088 } 1089 1090 port_priv->event_mode = false; 1091 } 1092 1093 static int cp210x_set_chars(struct usb_serial_port *port, 1094 struct cp210x_special_chars *chars) 1095 { 1096 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1097 struct usb_serial *serial = port->serial; 1098 void *dmabuf; 1099 int result; 1100 1101 dmabuf = kmemdup(chars, sizeof(*chars), GFP_KERNEL); 1102 if (!dmabuf) 1103 return -ENOMEM; 1104 1105 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 1106 CP210X_SET_CHARS, REQTYPE_HOST_TO_INTERFACE, 0, 1107 port_priv->bInterfaceNumber, 1108 dmabuf, sizeof(*chars), USB_CTRL_SET_TIMEOUT); 1109 1110 kfree(dmabuf); 1111 1112 if (result < 0) { 1113 dev_err(&port->dev, "failed to set special chars: %d\n", result); 1114 return result; 1115 } 1116 1117 return 0; 1118 } 1119 1120 static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b) 1121 { 1122 bool iflag_change, cc_change; 1123 1124 iflag_change = ((a->c_iflag ^ b->c_iflag) & (INPCK | IXON | IXOFF)); 1125 cc_change = a->c_cc[VSTART] != b->c_cc[VSTART] || 1126 a->c_cc[VSTOP] != b->c_cc[VSTOP]; 1127 1128 return tty_termios_hw_change(a, b) || iflag_change || cc_change; 1129 } 1130 1131 static void cp210x_set_flow_control(struct tty_struct *tty, 1132 struct usb_serial_port *port, struct ktermios *old_termios) 1133 { 1134 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1135 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1136 struct cp210x_special_chars chars; 1137 struct cp210x_flow_ctl flow_ctl; 1138 u32 flow_repl; 1139 u32 ctl_hs; 1140 int ret; 1141 1142 /* 1143 * Some CP2102N interpret ulXonLimit as ulFlowReplace (erratum 1144 * CP2102N_E104). Report back that flow control is not supported. 1145 */ 1146 if (priv->no_flow_control) { 1147 tty->termios.c_cflag &= ~CRTSCTS; 1148 tty->termios.c_iflag &= ~(IXON | IXOFF); 1149 } 1150 1151 if (old_termios && 1152 C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) && 1153 I_IXON(tty) == (old_termios->c_iflag & IXON) && 1154 I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) && 1155 START_CHAR(tty) == old_termios->c_cc[VSTART] && 1156 STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) { 1157 return; 1158 } 1159 1160 if (I_IXON(tty) || I_IXOFF(tty)) { 1161 memset(&chars, 0, sizeof(chars)); 1162 1163 chars.bXonChar = START_CHAR(tty); 1164 chars.bXoffChar = STOP_CHAR(tty); 1165 1166 ret = cp210x_set_chars(port, &chars); 1167 if (ret) 1168 return; 1169 } 1170 1171 mutex_lock(&port_priv->mutex); 1172 1173 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1174 sizeof(flow_ctl)); 1175 if (ret) 1176 goto out_unlock; 1177 1178 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1179 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1180 1181 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE; 1182 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE; 1183 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY; 1184 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1185 if (port_priv->dtr) 1186 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE; 1187 else 1188 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE; 1189 1190 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1191 if (C_CRTSCTS(tty)) { 1192 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE; 1193 if (port_priv->rts) 1194 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL; 1195 else 1196 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1197 port_priv->crtscts = true; 1198 } else { 1199 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE; 1200 if (port_priv->rts) 1201 flow_repl |= CP210X_SERIAL_RTS_ACTIVE; 1202 else 1203 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1204 port_priv->crtscts = false; 1205 } 1206 1207 if (I_IXOFF(tty)) { 1208 flow_repl |= CP210X_SERIAL_AUTO_RECEIVE; 1209 1210 flow_ctl.ulXonLimit = cpu_to_le32(128); 1211 flow_ctl.ulXoffLimit = cpu_to_le32(128); 1212 } else { 1213 flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE; 1214 } 1215 1216 if (I_IXON(tty)) 1217 flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT; 1218 else 1219 flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT; 1220 1221 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__, 1222 ctl_hs, flow_repl); 1223 1224 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1225 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1226 1227 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1228 sizeof(flow_ctl)); 1229 out_unlock: 1230 mutex_unlock(&port_priv->mutex); 1231 } 1232 1233 static void cp210x_set_termios(struct tty_struct *tty, 1234 struct usb_serial_port *port, struct ktermios *old_termios) 1235 { 1236 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1237 u16 bits; 1238 int ret; 1239 1240 if (old_termios && !cp210x_termios_change(&tty->termios, old_termios)) 1241 return; 1242 1243 if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed) 1244 cp210x_change_speed(tty, port, old_termios); 1245 1246 /* CP2101 only supports CS8, 1 stop bit and non-stick parity. */ 1247 if (priv->partnum == CP210X_PARTNUM_CP2101) { 1248 tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR); 1249 tty->termios.c_cflag |= CS8; 1250 } 1251 1252 bits = 0; 1253 1254 switch (C_CSIZE(tty)) { 1255 case CS5: 1256 bits |= BITS_DATA_5; 1257 break; 1258 case CS6: 1259 bits |= BITS_DATA_6; 1260 break; 1261 case CS7: 1262 bits |= BITS_DATA_7; 1263 break; 1264 case CS8: 1265 default: 1266 bits |= BITS_DATA_8; 1267 break; 1268 } 1269 1270 if (C_PARENB(tty)) { 1271 if (C_CMSPAR(tty)) { 1272 if (C_PARODD(tty)) 1273 bits |= BITS_PARITY_MARK; 1274 else 1275 bits |= BITS_PARITY_SPACE; 1276 } else { 1277 if (C_PARODD(tty)) 1278 bits |= BITS_PARITY_ODD; 1279 else 1280 bits |= BITS_PARITY_EVEN; 1281 } 1282 } 1283 1284 if (C_CSTOPB(tty)) 1285 bits |= BITS_STOP_2; 1286 else 1287 bits |= BITS_STOP_1; 1288 1289 ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1290 if (ret) 1291 dev_err(&port->dev, "failed to set line control: %d\n", ret); 1292 1293 cp210x_set_flow_control(tty, port, old_termios); 1294 1295 /* 1296 * Enable event-insertion mode only if input parity checking is 1297 * enabled for now. 1298 */ 1299 if (I_INPCK(tty)) 1300 cp210x_enable_event_mode(port); 1301 else 1302 cp210x_disable_event_mode(port); 1303 } 1304 1305 static int cp210x_tiocmset(struct tty_struct *tty, 1306 unsigned int set, unsigned int clear) 1307 { 1308 struct usb_serial_port *port = tty->driver_data; 1309 return cp210x_tiocmset_port(port, set, clear); 1310 } 1311 1312 static int cp210x_tiocmset_port(struct usb_serial_port *port, 1313 unsigned int set, unsigned int clear) 1314 { 1315 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1316 struct cp210x_flow_ctl flow_ctl; 1317 u32 ctl_hs, flow_repl; 1318 u16 control = 0; 1319 int ret; 1320 1321 mutex_lock(&port_priv->mutex); 1322 1323 if (set & TIOCM_RTS) { 1324 port_priv->rts = true; 1325 control |= CONTROL_RTS; 1326 control |= CONTROL_WRITE_RTS; 1327 } 1328 if (set & TIOCM_DTR) { 1329 port_priv->dtr = true; 1330 control |= CONTROL_DTR; 1331 control |= CONTROL_WRITE_DTR; 1332 } 1333 if (clear & TIOCM_RTS) { 1334 port_priv->rts = false; 1335 control &= ~CONTROL_RTS; 1336 control |= CONTROL_WRITE_RTS; 1337 } 1338 if (clear & TIOCM_DTR) { 1339 port_priv->dtr = false; 1340 control &= ~CONTROL_DTR; 1341 control |= CONTROL_WRITE_DTR; 1342 } 1343 1344 /* 1345 * Use SET_FLOW to set DTR and enable/disable auto-RTS when hardware 1346 * flow control is enabled. 1347 */ 1348 if (port_priv->crtscts && control & CONTROL_WRITE_RTS) { 1349 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1350 sizeof(flow_ctl)); 1351 if (ret) 1352 goto out_unlock; 1353 1354 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1355 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1356 1357 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1358 if (port_priv->dtr) 1359 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE; 1360 else 1361 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE; 1362 1363 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1364 if (port_priv->rts) 1365 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL; 1366 else 1367 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1368 1369 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1370 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1371 1372 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", 1373 __func__, ctl_hs, flow_repl); 1374 1375 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1376 sizeof(flow_ctl)); 1377 } else { 1378 dev_dbg(&port->dev, "%s - control = 0x%04x\n", __func__, control); 1379 1380 ret = cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1381 } 1382 out_unlock: 1383 mutex_unlock(&port_priv->mutex); 1384 1385 return ret; 1386 } 1387 1388 static void cp210x_dtr_rts(struct usb_serial_port *port, int on) 1389 { 1390 if (on) 1391 cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0); 1392 else 1393 cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS); 1394 } 1395 1396 static int cp210x_tiocmget(struct tty_struct *tty) 1397 { 1398 struct usb_serial_port *port = tty->driver_data; 1399 u8 control; 1400 int result; 1401 1402 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1403 if (result) 1404 return result; 1405 1406 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1407 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1408 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1409 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1410 |((control & CONTROL_RING)? TIOCM_RI : 0) 1411 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1412 1413 dev_dbg(&port->dev, "%s - control = 0x%02x\n", __func__, control); 1414 1415 return result; 1416 } 1417 1418 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 1419 { 1420 struct usb_serial_port *port = tty->driver_data; 1421 u16 state; 1422 1423 if (break_state == 0) 1424 state = BREAK_OFF; 1425 else 1426 state = BREAK_ON; 1427 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1428 state == BREAK_OFF ? "off" : "on"); 1429 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1430 } 1431 1432 #ifdef CONFIG_GPIOLIB 1433 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio) 1434 { 1435 struct usb_serial *serial = gpiochip_get_data(gc); 1436 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1437 u8 req_type = REQTYPE_DEVICE_TO_HOST; 1438 int result; 1439 u8 buf; 1440 1441 if (priv->partnum == CP210X_PARTNUM_CP2105) 1442 req_type = REQTYPE_INTERFACE_TO_HOST; 1443 1444 result = usb_autopm_get_interface(serial->interface); 1445 if (result) 1446 return result; 1447 1448 result = cp210x_read_vendor_block(serial, req_type, 1449 CP210X_READ_LATCH, &buf, sizeof(buf)); 1450 usb_autopm_put_interface(serial->interface); 1451 if (result < 0) 1452 return result; 1453 1454 return !!(buf & BIT(gpio)); 1455 } 1456 1457 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value) 1458 { 1459 struct usb_serial *serial = gpiochip_get_data(gc); 1460 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1461 struct cp210x_gpio_write buf; 1462 int result; 1463 1464 if (value == 1) 1465 buf.state = BIT(gpio); 1466 else 1467 buf.state = 0; 1468 1469 buf.mask = BIT(gpio); 1470 1471 result = usb_autopm_get_interface(serial->interface); 1472 if (result) 1473 goto out; 1474 1475 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1476 result = cp210x_write_vendor_block(serial, 1477 REQTYPE_HOST_TO_INTERFACE, 1478 CP210X_WRITE_LATCH, &buf, 1479 sizeof(buf)); 1480 } else { 1481 u16 wIndex = buf.state << 8 | buf.mask; 1482 1483 result = usb_control_msg(serial->dev, 1484 usb_sndctrlpipe(serial->dev, 0), 1485 CP210X_VENDOR_SPECIFIC, 1486 REQTYPE_HOST_TO_DEVICE, 1487 CP210X_WRITE_LATCH, 1488 wIndex, 1489 NULL, 0, USB_CTRL_SET_TIMEOUT); 1490 } 1491 1492 usb_autopm_put_interface(serial->interface); 1493 out: 1494 if (result < 0) { 1495 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n", 1496 result); 1497 } 1498 } 1499 1500 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio) 1501 { 1502 struct usb_serial *serial = gpiochip_get_data(gc); 1503 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1504 1505 return priv->gpio_input & BIT(gpio); 1506 } 1507 1508 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio) 1509 { 1510 struct usb_serial *serial = gpiochip_get_data(gc); 1511 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1512 1513 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1514 /* hardware does not support an input mode */ 1515 return -ENOTSUPP; 1516 } 1517 1518 /* push-pull pins cannot be changed to be inputs */ 1519 if (priv->gpio_pushpull & BIT(gpio)) 1520 return -EINVAL; 1521 1522 /* make sure to release pin if it is being driven low */ 1523 cp210x_gpio_set(gc, gpio, 1); 1524 1525 priv->gpio_input |= BIT(gpio); 1526 1527 return 0; 1528 } 1529 1530 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio, 1531 int value) 1532 { 1533 struct usb_serial *serial = gpiochip_get_data(gc); 1534 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1535 1536 priv->gpio_input &= ~BIT(gpio); 1537 cp210x_gpio_set(gc, gpio, value); 1538 1539 return 0; 1540 } 1541 1542 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio, 1543 unsigned long config) 1544 { 1545 struct usb_serial *serial = gpiochip_get_data(gc); 1546 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1547 enum pin_config_param param = pinconf_to_config_param(config); 1548 1549 /* Succeed only if in correct mode (this can't be set at runtime) */ 1550 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) && 1551 (priv->gpio_pushpull & BIT(gpio))) 1552 return 0; 1553 1554 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) && 1555 !(priv->gpio_pushpull & BIT(gpio))) 1556 return 0; 1557 1558 return -ENOTSUPP; 1559 } 1560 1561 static int cp210x_gpio_init_valid_mask(struct gpio_chip *gc, 1562 unsigned long *valid_mask, unsigned int ngpios) 1563 { 1564 struct usb_serial *serial = gpiochip_get_data(gc); 1565 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1566 struct device *dev = &serial->interface->dev; 1567 unsigned long altfunc_mask = priv->gpio_altfunc; 1568 1569 bitmap_complement(valid_mask, &altfunc_mask, ngpios); 1570 1571 if (bitmap_empty(valid_mask, ngpios)) 1572 dev_dbg(dev, "no pin configured for GPIO\n"); 1573 else 1574 dev_dbg(dev, "GPIO.%*pbl configured for GPIO\n", ngpios, 1575 valid_mask); 1576 return 0; 1577 } 1578 1579 /* 1580 * This function is for configuring GPIO using shared pins, where other signals 1581 * are made unavailable by configuring the use of GPIO. This is believed to be 1582 * only applicable to the cp2105 at this point, the other devices supported by 1583 * this driver that provide GPIO do so in a way that does not impact other 1584 * signals and are thus expected to have very different initialisation. 1585 */ 1586 static int cp2105_gpioconf_init(struct usb_serial *serial) 1587 { 1588 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1589 struct cp210x_pin_mode mode; 1590 struct cp210x_dual_port_config config; 1591 u8 intf_num = cp210x_interface_num(serial); 1592 u8 iface_config; 1593 int result; 1594 1595 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1596 CP210X_GET_DEVICEMODE, &mode, 1597 sizeof(mode)); 1598 if (result < 0) 1599 return result; 1600 1601 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1602 CP210X_GET_PORTCONFIG, &config, 1603 sizeof(config)); 1604 if (result < 0) 1605 return result; 1606 1607 /* 2 banks of GPIO - One for the pins taken from each serial port */ 1608 if (intf_num == 0) { 1609 if (mode.eci == CP210X_PIN_MODE_MODEM) { 1610 /* mark all GPIOs of this interface as reserved */ 1611 priv->gpio_altfunc = 0xff; 1612 return 0; 1613 } 1614 1615 iface_config = config.eci_cfg; 1616 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1617 CP210X_ECI_GPIO_MODE_MASK) >> 1618 CP210X_ECI_GPIO_MODE_OFFSET); 1619 priv->gc.ngpio = 2; 1620 } else if (intf_num == 1) { 1621 if (mode.sci == CP210X_PIN_MODE_MODEM) { 1622 /* mark all GPIOs of this interface as reserved */ 1623 priv->gpio_altfunc = 0xff; 1624 return 0; 1625 } 1626 1627 iface_config = config.sci_cfg; 1628 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1629 CP210X_SCI_GPIO_MODE_MASK) >> 1630 CP210X_SCI_GPIO_MODE_OFFSET); 1631 priv->gc.ngpio = 3; 1632 } else { 1633 return -ENODEV; 1634 } 1635 1636 /* mark all pins which are not in GPIO mode */ 1637 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */ 1638 priv->gpio_altfunc |= BIT(0); 1639 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */ 1640 CP2105_GPIO1_RS485_MODE)) 1641 priv->gpio_altfunc |= BIT(1); 1642 1643 /* driver implementation for CP2105 only supports outputs */ 1644 priv->gpio_input = 0; 1645 1646 return 0; 1647 } 1648 1649 static int cp2104_gpioconf_init(struct usb_serial *serial) 1650 { 1651 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1652 struct cp210x_single_port_config config; 1653 u8 iface_config; 1654 u8 gpio_latch; 1655 int result; 1656 u8 i; 1657 1658 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1659 CP210X_GET_PORTCONFIG, &config, 1660 sizeof(config)); 1661 if (result < 0) 1662 return result; 1663 1664 priv->gc.ngpio = 4; 1665 1666 iface_config = config.device_cfg; 1667 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1668 CP210X_GPIO_MODE_MASK) >> 1669 CP210X_GPIO_MODE_OFFSET); 1670 gpio_latch = (u8)((le16_to_cpu(config.reset_state) & 1671 CP210X_GPIO_MODE_MASK) >> 1672 CP210X_GPIO_MODE_OFFSET); 1673 1674 /* mark all pins which are not in GPIO mode */ 1675 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */ 1676 priv->gpio_altfunc |= BIT(0); 1677 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */ 1678 priv->gpio_altfunc |= BIT(1); 1679 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */ 1680 priv->gpio_altfunc |= BIT(2); 1681 1682 /* 1683 * Like CP2102N, CP2104 has also no strict input and output pin 1684 * modes. 1685 * Do the same input mode emulation as CP2102N. 1686 */ 1687 for (i = 0; i < priv->gc.ngpio; ++i) { 1688 /* 1689 * Set direction to "input" iff pin is open-drain and reset 1690 * value is 1. 1691 */ 1692 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1693 priv->gpio_input |= BIT(i); 1694 } 1695 1696 return 0; 1697 } 1698 1699 static int cp2102n_gpioconf_init(struct usb_serial *serial) 1700 { 1701 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1702 const u16 config_size = 0x02a6; 1703 u8 gpio_rst_latch; 1704 u8 config_version; 1705 u8 gpio_pushpull; 1706 u8 *config_buf; 1707 u8 gpio_latch; 1708 u8 gpio_ctrl; 1709 int result; 1710 u8 i; 1711 1712 /* 1713 * Retrieve device configuration from the device. 1714 * The array received contains all customization settings done at the 1715 * factory/manufacturer. Format of the array is documented at the 1716 * time of writing at: 1717 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa 1718 */ 1719 config_buf = kmalloc(config_size, GFP_KERNEL); 1720 if (!config_buf) 1721 return -ENOMEM; 1722 1723 result = cp210x_read_vendor_block(serial, 1724 REQTYPE_DEVICE_TO_HOST, 1725 CP210X_READ_2NCONFIG, 1726 config_buf, 1727 config_size); 1728 if (result < 0) { 1729 kfree(config_buf); 1730 return result; 1731 } 1732 1733 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX]; 1734 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX]; 1735 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX]; 1736 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX]; 1737 1738 kfree(config_buf); 1739 1740 /* Make sure this is a config format we understand. */ 1741 if (config_version != 0x01) 1742 return -ENOTSUPP; 1743 1744 priv->gc.ngpio = 4; 1745 1746 /* 1747 * Get default pin states after reset. Needed so we can determine 1748 * the direction of an open-drain pin. 1749 */ 1750 gpio_latch = (gpio_rst_latch >> 3) & 0x0f; 1751 1752 /* 0 indicates open-drain mode, 1 is push-pull */ 1753 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f; 1754 1755 /* 0 indicates GPIO mode, 1 is alternate function */ 1756 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) { 1757 /* QFN20 is special... */ 1758 if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE) /* GPIO 0 */ 1759 priv->gpio_altfunc |= BIT(0); 1760 if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */ 1761 priv->gpio_altfunc |= BIT(1); 1762 if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */ 1763 priv->gpio_altfunc |= BIT(2); 1764 if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */ 1765 priv->gpio_altfunc |= BIT(3); 1766 } else { 1767 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f; 1768 } 1769 1770 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) { 1771 /* 1772 * For the QFN28 package, GPIO4-6 are controlled by 1773 * the low three bits of the mode/latch fields. 1774 * Contrary to the document linked above, the bits for 1775 * the SUSPEND pins are elsewhere. No alternate 1776 * function is available for these pins. 1777 */ 1778 priv->gc.ngpio = 7; 1779 gpio_latch |= (gpio_rst_latch & 7) << 4; 1780 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4; 1781 } 1782 1783 /* 1784 * The CP2102N does not strictly has input and output pin modes, 1785 * it only knows open-drain and push-pull modes which is set at 1786 * factory. An open-drain pin can function both as an 1787 * input or an output. We emulate input mode for open-drain pins 1788 * by making sure they are not driven low, and we do not allow 1789 * push-pull pins to be set as an input. 1790 */ 1791 for (i = 0; i < priv->gc.ngpio; ++i) { 1792 /* 1793 * Set direction to "input" iff pin is open-drain and reset 1794 * value is 1. 1795 */ 1796 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1797 priv->gpio_input |= BIT(i); 1798 } 1799 1800 return 0; 1801 } 1802 1803 static int cp210x_gpio_init(struct usb_serial *serial) 1804 { 1805 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1806 int result; 1807 1808 switch (priv->partnum) { 1809 case CP210X_PARTNUM_CP2104: 1810 result = cp2104_gpioconf_init(serial); 1811 break; 1812 case CP210X_PARTNUM_CP2105: 1813 result = cp2105_gpioconf_init(serial); 1814 break; 1815 case CP210X_PARTNUM_CP2102N_QFN28: 1816 case CP210X_PARTNUM_CP2102N_QFN24: 1817 case CP210X_PARTNUM_CP2102N_QFN20: 1818 result = cp2102n_gpioconf_init(serial); 1819 break; 1820 default: 1821 return 0; 1822 } 1823 1824 if (result < 0) 1825 return result; 1826 1827 priv->gc.label = "cp210x"; 1828 priv->gc.get_direction = cp210x_gpio_direction_get; 1829 priv->gc.direction_input = cp210x_gpio_direction_input; 1830 priv->gc.direction_output = cp210x_gpio_direction_output; 1831 priv->gc.get = cp210x_gpio_get; 1832 priv->gc.set = cp210x_gpio_set; 1833 priv->gc.set_config = cp210x_gpio_set_config; 1834 priv->gc.init_valid_mask = cp210x_gpio_init_valid_mask; 1835 priv->gc.owner = THIS_MODULE; 1836 priv->gc.parent = &serial->interface->dev; 1837 priv->gc.base = -1; 1838 priv->gc.can_sleep = true; 1839 1840 result = gpiochip_add_data(&priv->gc, serial); 1841 if (!result) 1842 priv->gpio_registered = true; 1843 1844 return result; 1845 } 1846 1847 static void cp210x_gpio_remove(struct usb_serial *serial) 1848 { 1849 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1850 1851 if (priv->gpio_registered) { 1852 gpiochip_remove(&priv->gc); 1853 priv->gpio_registered = false; 1854 } 1855 } 1856 1857 #else 1858 1859 static int cp210x_gpio_init(struct usb_serial *serial) 1860 { 1861 return 0; 1862 } 1863 1864 static void cp210x_gpio_remove(struct usb_serial *serial) 1865 { 1866 /* Nothing to do */ 1867 } 1868 1869 #endif 1870 1871 static int cp210x_port_probe(struct usb_serial_port *port) 1872 { 1873 struct usb_serial *serial = port->serial; 1874 struct cp210x_port_private *port_priv; 1875 1876 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 1877 if (!port_priv) 1878 return -ENOMEM; 1879 1880 port_priv->bInterfaceNumber = cp210x_interface_num(serial); 1881 mutex_init(&port_priv->mutex); 1882 1883 usb_set_serial_port_data(port, port_priv); 1884 1885 return 0; 1886 } 1887 1888 static void cp210x_port_remove(struct usb_serial_port *port) 1889 { 1890 struct cp210x_port_private *port_priv; 1891 1892 port_priv = usb_get_serial_port_data(port); 1893 kfree(port_priv); 1894 } 1895 1896 static void cp210x_init_max_speed(struct usb_serial *serial) 1897 { 1898 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1899 bool use_actual_rate = false; 1900 speed_t min = 300; 1901 speed_t max; 1902 1903 switch (priv->partnum) { 1904 case CP210X_PARTNUM_CP2101: 1905 max = 921600; 1906 break; 1907 case CP210X_PARTNUM_CP2102: 1908 case CP210X_PARTNUM_CP2103: 1909 max = 1000000; 1910 break; 1911 case CP210X_PARTNUM_CP2104: 1912 use_actual_rate = true; 1913 max = 2000000; 1914 break; 1915 case CP210X_PARTNUM_CP2108: 1916 max = 2000000; 1917 break; 1918 case CP210X_PARTNUM_CP2105: 1919 if (cp210x_interface_num(serial) == 0) { 1920 use_actual_rate = true; 1921 max = 2000000; /* ECI */ 1922 } else { 1923 min = 2400; 1924 max = 921600; /* SCI */ 1925 } 1926 break; 1927 case CP210X_PARTNUM_CP2102N_QFN28: 1928 case CP210X_PARTNUM_CP2102N_QFN24: 1929 case CP210X_PARTNUM_CP2102N_QFN20: 1930 use_actual_rate = true; 1931 max = 3000000; 1932 break; 1933 default: 1934 max = 2000000; 1935 break; 1936 } 1937 1938 priv->min_speed = min; 1939 priv->max_speed = max; 1940 priv->use_actual_rate = use_actual_rate; 1941 } 1942 1943 static int cp210x_get_fw_version(struct usb_serial *serial, u16 value) 1944 { 1945 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1946 u8 ver[3]; 1947 int ret; 1948 1949 ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, value, 1950 ver, sizeof(ver)); 1951 if (ret) 1952 return ret; 1953 1954 dev_dbg(&serial->interface->dev, "%s - %d.%d.%d\n", __func__, 1955 ver[0], ver[1], ver[2]); 1956 1957 priv->fw_version = ver[0] << 16 | ver[1] << 8 | ver[2]; 1958 1959 return 0; 1960 } 1961 1962 static void cp210x_determine_quirks(struct usb_serial *serial) 1963 { 1964 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1965 int ret; 1966 1967 switch (priv->partnum) { 1968 case CP210X_PARTNUM_CP2102N_QFN28: 1969 case CP210X_PARTNUM_CP2102N_QFN24: 1970 case CP210X_PARTNUM_CP2102N_QFN20: 1971 ret = cp210x_get_fw_version(serial, CP210X_GET_FW_VER_2N); 1972 if (ret) 1973 break; 1974 if (priv->fw_version <= 0x10004) 1975 priv->no_flow_control = true; 1976 break; 1977 default: 1978 break; 1979 } 1980 } 1981 1982 static int cp210x_attach(struct usb_serial *serial) 1983 { 1984 int result; 1985 struct cp210x_serial_private *priv; 1986 1987 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1988 if (!priv) 1989 return -ENOMEM; 1990 1991 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1992 CP210X_GET_PARTNUM, &priv->partnum, 1993 sizeof(priv->partnum)); 1994 if (result < 0) { 1995 dev_warn(&serial->interface->dev, 1996 "querying part number failed\n"); 1997 priv->partnum = CP210X_PARTNUM_UNKNOWN; 1998 } 1999 2000 usb_set_serial_data(serial, priv); 2001 2002 cp210x_determine_quirks(serial); 2003 cp210x_init_max_speed(serial); 2004 2005 result = cp210x_gpio_init(serial); 2006 if (result < 0) { 2007 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n", 2008 result); 2009 } 2010 2011 return 0; 2012 } 2013 2014 static void cp210x_disconnect(struct usb_serial *serial) 2015 { 2016 cp210x_gpio_remove(serial); 2017 } 2018 2019 static void cp210x_release(struct usb_serial *serial) 2020 { 2021 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2022 2023 cp210x_gpio_remove(serial); 2024 2025 kfree(priv); 2026 } 2027 2028 module_usb_serial_driver(serial_drivers, id_table); 2029 2030 MODULE_DESCRIPTION(DRIVER_DESC); 2031 MODULE_LICENSE("GPL v2"); 2032