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 speed_t min_speed; 256 speed_t max_speed; 257 bool use_actual_rate; 258 }; 259 260 enum cp210x_event_state { 261 ES_DATA, 262 ES_ESCAPE, 263 ES_LSR, 264 ES_LSR_DATA_0, 265 ES_LSR_DATA_1, 266 ES_MSR 267 }; 268 269 struct cp210x_port_private { 270 u8 bInterfaceNumber; 271 bool event_mode; 272 enum cp210x_event_state event_state; 273 u8 lsr; 274 275 struct mutex mutex; 276 bool crtscts; 277 bool dtr; 278 bool rts; 279 }; 280 281 static struct usb_serial_driver cp210x_device = { 282 .driver = { 283 .owner = THIS_MODULE, 284 .name = "cp210x", 285 }, 286 .id_table = id_table, 287 .num_ports = 1, 288 .bulk_in_size = 256, 289 .bulk_out_size = 256, 290 .open = cp210x_open, 291 .close = cp210x_close, 292 .break_ctl = cp210x_break_ctl, 293 .set_termios = cp210x_set_termios, 294 .tx_empty = cp210x_tx_empty, 295 .throttle = usb_serial_generic_throttle, 296 .unthrottle = usb_serial_generic_unthrottle, 297 .tiocmget = cp210x_tiocmget, 298 .tiocmset = cp210x_tiocmset, 299 .get_icount = usb_serial_generic_get_icount, 300 .attach = cp210x_attach, 301 .disconnect = cp210x_disconnect, 302 .release = cp210x_release, 303 .port_probe = cp210x_port_probe, 304 .port_remove = cp210x_port_remove, 305 .dtr_rts = cp210x_dtr_rts, 306 .process_read_urb = cp210x_process_read_urb, 307 }; 308 309 static struct usb_serial_driver * const serial_drivers[] = { 310 &cp210x_device, NULL 311 }; 312 313 /* Config request types */ 314 #define REQTYPE_HOST_TO_INTERFACE 0x41 315 #define REQTYPE_INTERFACE_TO_HOST 0xc1 316 #define REQTYPE_HOST_TO_DEVICE 0x40 317 #define REQTYPE_DEVICE_TO_HOST 0xc0 318 319 /* Config request codes */ 320 #define CP210X_IFC_ENABLE 0x00 321 #define CP210X_SET_BAUDDIV 0x01 322 #define CP210X_GET_BAUDDIV 0x02 323 #define CP210X_SET_LINE_CTL 0x03 324 #define CP210X_GET_LINE_CTL 0x04 325 #define CP210X_SET_BREAK 0x05 326 #define CP210X_IMM_CHAR 0x06 327 #define CP210X_SET_MHS 0x07 328 #define CP210X_GET_MDMSTS 0x08 329 #define CP210X_SET_XON 0x09 330 #define CP210X_SET_XOFF 0x0A 331 #define CP210X_SET_EVENTMASK 0x0B 332 #define CP210X_GET_EVENTMASK 0x0C 333 #define CP210X_SET_CHAR 0x0D 334 #define CP210X_GET_CHARS 0x0E 335 #define CP210X_GET_PROPS 0x0F 336 #define CP210X_GET_COMM_STATUS 0x10 337 #define CP210X_RESET 0x11 338 #define CP210X_PURGE 0x12 339 #define CP210X_SET_FLOW 0x13 340 #define CP210X_GET_FLOW 0x14 341 #define CP210X_EMBED_EVENTS 0x15 342 #define CP210X_GET_EVENTSTATE 0x16 343 #define CP210X_SET_CHARS 0x19 344 #define CP210X_GET_BAUDRATE 0x1D 345 #define CP210X_SET_BAUDRATE 0x1E 346 #define CP210X_VENDOR_SPECIFIC 0xFF 347 348 /* CP210X_IFC_ENABLE */ 349 #define UART_ENABLE 0x0001 350 #define UART_DISABLE 0x0000 351 352 /* CP210X_(SET|GET)_BAUDDIV */ 353 #define BAUD_RATE_GEN_FREQ 0x384000 354 355 /* CP210X_(SET|GET)_LINE_CTL */ 356 #define BITS_DATA_MASK 0X0f00 357 #define BITS_DATA_5 0X0500 358 #define BITS_DATA_6 0X0600 359 #define BITS_DATA_7 0X0700 360 #define BITS_DATA_8 0X0800 361 #define BITS_DATA_9 0X0900 362 363 #define BITS_PARITY_MASK 0x00f0 364 #define BITS_PARITY_NONE 0x0000 365 #define BITS_PARITY_ODD 0x0010 366 #define BITS_PARITY_EVEN 0x0020 367 #define BITS_PARITY_MARK 0x0030 368 #define BITS_PARITY_SPACE 0x0040 369 370 #define BITS_STOP_MASK 0x000f 371 #define BITS_STOP_1 0x0000 372 #define BITS_STOP_1_5 0x0001 373 #define BITS_STOP_2 0x0002 374 375 /* CP210X_SET_BREAK */ 376 #define BREAK_ON 0x0001 377 #define BREAK_OFF 0x0000 378 379 /* CP210X_(SET_MHS|GET_MDMSTS) */ 380 #define CONTROL_DTR 0x0001 381 #define CONTROL_RTS 0x0002 382 #define CONTROL_CTS 0x0010 383 #define CONTROL_DSR 0x0020 384 #define CONTROL_RING 0x0040 385 #define CONTROL_DCD 0x0080 386 #define CONTROL_WRITE_DTR 0x0100 387 #define CONTROL_WRITE_RTS 0x0200 388 389 /* CP210X_(GET|SET)_CHARS */ 390 struct cp210x_special_chars { 391 u8 bEofChar; 392 u8 bErrorChar; 393 u8 bBreakChar; 394 u8 bEventChar; 395 u8 bXonChar; 396 u8 bXoffChar; 397 }; 398 399 /* CP210X_VENDOR_SPECIFIC values */ 400 #define CP210X_READ_2NCONFIG 0x000E 401 #define CP210X_READ_LATCH 0x00C2 402 #define CP210X_GET_PARTNUM 0x370B 403 #define CP210X_GET_PORTCONFIG 0x370C 404 #define CP210X_GET_DEVICEMODE 0x3711 405 #define CP210X_WRITE_LATCH 0x37E1 406 407 /* Part number definitions */ 408 #define CP210X_PARTNUM_CP2101 0x01 409 #define CP210X_PARTNUM_CP2102 0x02 410 #define CP210X_PARTNUM_CP2103 0x03 411 #define CP210X_PARTNUM_CP2104 0x04 412 #define CP210X_PARTNUM_CP2105 0x05 413 #define CP210X_PARTNUM_CP2108 0x08 414 #define CP210X_PARTNUM_CP2102N_QFN28 0x20 415 #define CP210X_PARTNUM_CP2102N_QFN24 0x21 416 #define CP210X_PARTNUM_CP2102N_QFN20 0x22 417 #define CP210X_PARTNUM_UNKNOWN 0xFF 418 419 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 420 struct cp210x_comm_status { 421 __le32 ulErrors; 422 __le32 ulHoldReasons; 423 __le32 ulAmountInInQueue; 424 __le32 ulAmountInOutQueue; 425 u8 bEofReceived; 426 u8 bWaitForImmediate; 427 u8 bReserved; 428 } __packed; 429 430 /* 431 * CP210X_PURGE - 16 bits passed in wValue of USB request. 432 * SiLabs app note AN571 gives a strange description of the 4 bits: 433 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 434 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 435 */ 436 #define PURGE_ALL 0x000f 437 438 /* CP210X_EMBED_EVENTS */ 439 #define CP210X_ESCCHAR 0xec 440 441 #define CP210X_LSR_OVERRUN BIT(1) 442 #define CP210X_LSR_PARITY BIT(2) 443 #define CP210X_LSR_FRAME BIT(3) 444 #define CP210X_LSR_BREAK BIT(4) 445 446 447 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */ 448 struct cp210x_flow_ctl { 449 __le32 ulControlHandshake; 450 __le32 ulFlowReplace; 451 __le32 ulXonLimit; 452 __le32 ulXoffLimit; 453 }; 454 455 /* cp210x_flow_ctl::ulControlHandshake */ 456 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0) 457 #define CP210X_SERIAL_DTR_INACTIVE (0 << 0) 458 #define CP210X_SERIAL_DTR_ACTIVE (1 << 0) 459 #define CP210X_SERIAL_DTR_FLOW_CTL (2 << 0) 460 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3) 461 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4) 462 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5) 463 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6) 464 465 /* cp210x_flow_ctl::ulFlowReplace */ 466 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0) 467 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1) 468 #define CP210X_SERIAL_ERROR_CHAR BIT(2) 469 #define CP210X_SERIAL_NULL_STRIPPING BIT(3) 470 #define CP210X_SERIAL_BREAK_CHAR BIT(4) 471 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6) 472 #define CP210X_SERIAL_RTS_INACTIVE (0 << 6) 473 #define CP210X_SERIAL_RTS_ACTIVE (1 << 6) 474 #define CP210X_SERIAL_RTS_FLOW_CTL (2 << 6) 475 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31) 476 477 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */ 478 struct cp210x_pin_mode { 479 u8 eci; 480 u8 sci; 481 }; 482 483 #define CP210X_PIN_MODE_MODEM 0 484 #define CP210X_PIN_MODE_GPIO BIT(0) 485 486 /* 487 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes 488 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes. 489 */ 490 struct cp210x_dual_port_config { 491 __le16 gpio_mode; 492 u8 __pad0[2]; 493 __le16 reset_state; 494 u8 __pad1[4]; 495 __le16 suspend_state; 496 u8 sci_cfg; 497 u8 eci_cfg; 498 u8 device_cfg; 499 } __packed; 500 501 /* 502 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes 503 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes. 504 */ 505 struct cp210x_single_port_config { 506 __le16 gpio_mode; 507 u8 __pad0[2]; 508 __le16 reset_state; 509 u8 __pad1[4]; 510 __le16 suspend_state; 511 u8 device_cfg; 512 } __packed; 513 514 /* GPIO modes */ 515 #define CP210X_SCI_GPIO_MODE_OFFSET 9 516 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9) 517 518 #define CP210X_ECI_GPIO_MODE_OFFSET 2 519 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2) 520 521 #define CP210X_GPIO_MODE_OFFSET 8 522 #define CP210X_GPIO_MODE_MASK GENMASK(11, 8) 523 524 /* CP2105 port configuration values */ 525 #define CP2105_GPIO0_TXLED_MODE BIT(0) 526 #define CP2105_GPIO1_RXLED_MODE BIT(1) 527 #define CP2105_GPIO1_RS485_MODE BIT(2) 528 529 /* CP2104 port configuration values */ 530 #define CP2104_GPIO0_TXLED_MODE BIT(0) 531 #define CP2104_GPIO1_RXLED_MODE BIT(1) 532 #define CP2104_GPIO2_RS485_MODE BIT(2) 533 534 /* CP2102N configuration array indices */ 535 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2 536 #define CP210X_2NCONFIG_GPIO_MODE_IDX 581 537 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587 538 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600 539 540 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */ 541 struct cp210x_gpio_write { 542 u8 mask; 543 u8 state; 544 }; 545 546 /* 547 * Helper to get interface number when we only have struct usb_serial. 548 */ 549 static u8 cp210x_interface_num(struct usb_serial *serial) 550 { 551 struct usb_host_interface *cur_altsetting; 552 553 cur_altsetting = serial->interface->cur_altsetting; 554 555 return cur_altsetting->desc.bInterfaceNumber; 556 } 557 558 /* 559 * Reads a variable-sized block of CP210X_ registers, identified by req. 560 * Returns data into buf in native USB byte order. 561 */ 562 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, 563 void *buf, int bufsize) 564 { 565 struct usb_serial *serial = port->serial; 566 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 567 void *dmabuf; 568 int result; 569 570 dmabuf = kmalloc(bufsize, GFP_KERNEL); 571 if (!dmabuf) 572 return -ENOMEM; 573 574 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 575 req, REQTYPE_INTERFACE_TO_HOST, 0, 576 port_priv->bInterfaceNumber, dmabuf, bufsize, 577 USB_CTRL_SET_TIMEOUT); 578 if (result == bufsize) { 579 memcpy(buf, dmabuf, bufsize); 580 result = 0; 581 } else { 582 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", 583 req, bufsize, result); 584 if (result >= 0) 585 result = -EIO; 586 } 587 588 kfree(dmabuf); 589 590 return result; 591 } 592 593 /* 594 * Reads any 8-bit CP210X_ register identified by req. 595 */ 596 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val) 597 { 598 return cp210x_read_reg_block(port, req, val, sizeof(*val)); 599 } 600 601 /* 602 * Reads a variable-sized vendor block of CP210X_ registers, identified by val. 603 * Returns data into buf in native USB byte order. 604 */ 605 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val, 606 void *buf, int bufsize) 607 { 608 void *dmabuf; 609 int result; 610 611 dmabuf = kmalloc(bufsize, GFP_KERNEL); 612 if (!dmabuf) 613 return -ENOMEM; 614 615 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 616 CP210X_VENDOR_SPECIFIC, type, val, 617 cp210x_interface_num(serial), dmabuf, bufsize, 618 USB_CTRL_GET_TIMEOUT); 619 if (result == bufsize) { 620 memcpy(buf, dmabuf, bufsize); 621 result = 0; 622 } else { 623 dev_err(&serial->interface->dev, 624 "failed to get vendor val 0x%04x size %d: %d\n", val, 625 bufsize, result); 626 if (result >= 0) 627 result = -EIO; 628 } 629 630 kfree(dmabuf); 631 632 return result; 633 } 634 635 /* 636 * Writes any 16-bit CP210X_ register (req) whose value is passed 637 * entirely in the wValue field of the USB request. 638 */ 639 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) 640 { 641 struct usb_serial *serial = port->serial; 642 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 643 int result; 644 645 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 646 req, REQTYPE_HOST_TO_INTERFACE, val, 647 port_priv->bInterfaceNumber, NULL, 0, 648 USB_CTRL_SET_TIMEOUT); 649 if (result < 0) { 650 dev_err(&port->dev, "failed set request 0x%x status: %d\n", 651 req, result); 652 } 653 654 return result; 655 } 656 657 /* 658 * Writes a variable-sized block of CP210X_ registers, identified by req. 659 * Data in buf must be in native USB byte order. 660 */ 661 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req, 662 void *buf, int bufsize) 663 { 664 struct usb_serial *serial = port->serial; 665 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 666 void *dmabuf; 667 int result; 668 669 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 670 if (!dmabuf) 671 return -ENOMEM; 672 673 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 674 req, REQTYPE_HOST_TO_INTERFACE, 0, 675 port_priv->bInterfaceNumber, dmabuf, bufsize, 676 USB_CTRL_SET_TIMEOUT); 677 678 kfree(dmabuf); 679 680 if (result < 0) { 681 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", 682 req, bufsize, result); 683 return result; 684 } 685 686 return 0; 687 } 688 689 /* 690 * Writes any 32-bit CP210X_ register identified by req. 691 */ 692 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) 693 { 694 __le32 le32_val; 695 696 le32_val = cpu_to_le32(val); 697 698 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); 699 } 700 701 #ifdef CONFIG_GPIOLIB 702 /* 703 * Writes a variable-sized vendor block of CP210X_ registers, identified by val. 704 * Data in buf must be in native USB byte order. 705 */ 706 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type, 707 u16 val, void *buf, int bufsize) 708 { 709 void *dmabuf; 710 int result; 711 712 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 713 if (!dmabuf) 714 return -ENOMEM; 715 716 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 717 CP210X_VENDOR_SPECIFIC, type, val, 718 cp210x_interface_num(serial), dmabuf, bufsize, 719 USB_CTRL_SET_TIMEOUT); 720 721 kfree(dmabuf); 722 723 if (result < 0) { 724 dev_err(&serial->interface->dev, 725 "failed to set vendor val 0x%04x size %d: %d\n", val, 726 bufsize, result); 727 return result; 728 } 729 730 return 0; 731 } 732 #endif 733 734 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 735 { 736 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 737 int result; 738 739 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 740 if (result) { 741 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 742 return result; 743 } 744 745 if (tty) 746 cp210x_set_termios(tty, port, NULL); 747 748 result = usb_serial_generic_open(tty, port); 749 if (result) 750 goto err_disable; 751 752 return 0; 753 754 err_disable: 755 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 756 port_priv->event_mode = false; 757 758 return result; 759 } 760 761 static void cp210x_close(struct usb_serial_port *port) 762 { 763 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 764 765 usb_serial_generic_close(port); 766 767 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 768 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 769 770 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 771 772 /* Disabling the interface disables event-insertion mode. */ 773 port_priv->event_mode = false; 774 } 775 776 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag) 777 { 778 if (lsr & CP210X_LSR_BREAK) { 779 port->icount.brk++; 780 *flag = TTY_BREAK; 781 } else if (lsr & CP210X_LSR_PARITY) { 782 port->icount.parity++; 783 *flag = TTY_PARITY; 784 } else if (lsr & CP210X_LSR_FRAME) { 785 port->icount.frame++; 786 *flag = TTY_FRAME; 787 } 788 789 if (lsr & CP210X_LSR_OVERRUN) { 790 port->icount.overrun++; 791 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); 792 } 793 } 794 795 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag) 796 { 797 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 798 799 switch (port_priv->event_state) { 800 case ES_DATA: 801 if (*ch == CP210X_ESCCHAR) { 802 port_priv->event_state = ES_ESCAPE; 803 break; 804 } 805 return false; 806 case ES_ESCAPE: 807 switch (*ch) { 808 case 0: 809 dev_dbg(&port->dev, "%s - escape char\n", __func__); 810 *ch = CP210X_ESCCHAR; 811 port_priv->event_state = ES_DATA; 812 return false; 813 case 1: 814 port_priv->event_state = ES_LSR_DATA_0; 815 break; 816 case 2: 817 port_priv->event_state = ES_LSR; 818 break; 819 case 3: 820 port_priv->event_state = ES_MSR; 821 break; 822 default: 823 dev_err(&port->dev, "malformed event 0x%02x\n", *ch); 824 port_priv->event_state = ES_DATA; 825 break; 826 } 827 break; 828 case ES_LSR_DATA_0: 829 port_priv->lsr = *ch; 830 port_priv->event_state = ES_LSR_DATA_1; 831 break; 832 case ES_LSR_DATA_1: 833 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n", 834 __func__, port_priv->lsr, *ch); 835 cp210x_process_lsr(port, port_priv->lsr, flag); 836 port_priv->event_state = ES_DATA; 837 return false; 838 case ES_LSR: 839 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch); 840 port_priv->lsr = *ch; 841 cp210x_process_lsr(port, port_priv->lsr, flag); 842 port_priv->event_state = ES_DATA; 843 break; 844 case ES_MSR: 845 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch); 846 /* unimplemented */ 847 port_priv->event_state = ES_DATA; 848 break; 849 } 850 851 return true; 852 } 853 854 static void cp210x_process_read_urb(struct urb *urb) 855 { 856 struct usb_serial_port *port = urb->context; 857 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 858 unsigned char *ch = urb->transfer_buffer; 859 char flag; 860 int i; 861 862 if (!urb->actual_length) 863 return; 864 865 if (port_priv->event_mode) { 866 for (i = 0; i < urb->actual_length; i++, ch++) { 867 flag = TTY_NORMAL; 868 869 if (cp210x_process_char(port, ch, &flag)) 870 continue; 871 872 tty_insert_flip_char(&port->port, *ch, flag); 873 } 874 } else { 875 tty_insert_flip_string(&port->port, ch, urb->actual_length); 876 } 877 tty_flip_buffer_push(&port->port); 878 } 879 880 /* 881 * Read how many bytes are waiting in the TX queue. 882 */ 883 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 884 u32 *count) 885 { 886 struct usb_serial *serial = port->serial; 887 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 888 struct cp210x_comm_status *sts; 889 int result; 890 891 sts = kmalloc(sizeof(*sts), GFP_KERNEL); 892 if (!sts) 893 return -ENOMEM; 894 895 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 896 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST, 897 0, port_priv->bInterfaceNumber, sts, sizeof(*sts), 898 USB_CTRL_GET_TIMEOUT); 899 if (result == sizeof(*sts)) { 900 *count = le32_to_cpu(sts->ulAmountInOutQueue); 901 result = 0; 902 } else { 903 dev_err(&port->dev, "failed to get comm status: %d\n", result); 904 if (result >= 0) 905 result = -EIO; 906 } 907 908 kfree(sts); 909 910 return result; 911 } 912 913 static bool cp210x_tx_empty(struct usb_serial_port *port) 914 { 915 int err; 916 u32 count; 917 918 err = cp210x_get_tx_queue_byte_count(port, &count); 919 if (err) 920 return true; 921 922 return !count; 923 } 924 925 struct cp210x_rate { 926 speed_t rate; 927 speed_t high; 928 }; 929 930 static const struct cp210x_rate cp210x_an205_table1[] = { 931 { 300, 300 }, 932 { 600, 600 }, 933 { 1200, 1200 }, 934 { 1800, 1800 }, 935 { 2400, 2400 }, 936 { 4000, 4000 }, 937 { 4800, 4803 }, 938 { 7200, 7207 }, 939 { 9600, 9612 }, 940 { 14400, 14428 }, 941 { 16000, 16062 }, 942 { 19200, 19250 }, 943 { 28800, 28912 }, 944 { 38400, 38601 }, 945 { 51200, 51558 }, 946 { 56000, 56280 }, 947 { 57600, 58053 }, 948 { 64000, 64111 }, 949 { 76800, 77608 }, 950 { 115200, 117028 }, 951 { 128000, 129347 }, 952 { 153600, 156868 }, 953 { 230400, 237832 }, 954 { 250000, 254234 }, 955 { 256000, 273066 }, 956 { 460800, 491520 }, 957 { 500000, 567138 }, 958 { 576000, 670254 }, 959 { 921600, UINT_MAX } 960 }; 961 962 /* 963 * Quantises the baud rate as per AN205 Table 1 964 */ 965 static speed_t cp210x_get_an205_rate(speed_t baud) 966 { 967 int i; 968 969 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) { 970 if (baud <= cp210x_an205_table1[i].high) 971 break; 972 } 973 974 return cp210x_an205_table1[i].rate; 975 } 976 977 static speed_t cp210x_get_actual_rate(speed_t baud) 978 { 979 unsigned int prescale = 1; 980 unsigned int div; 981 982 if (baud <= 365) 983 prescale = 4; 984 985 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud); 986 baud = 48000000 / (2 * prescale * div); 987 988 return baud; 989 } 990 991 /* 992 * CP2101 supports the following baud rates: 993 * 994 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 995 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 996 * 997 * CP2102 and CP2103 support the following additional rates: 998 * 999 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 1000 * 576000 1001 * 1002 * The device will map a requested rate to a supported one, but the result 1003 * of requests for rates greater than 1053257 is undefined (see AN205). 1004 * 1005 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 1006 * respectively, with an error less than 1%. The actual rates are determined 1007 * by 1008 * 1009 * div = round(freq / (2 x prescale x request)) 1010 * actual = freq / (2 x prescale x div) 1011 * 1012 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 1013 * or 1 otherwise. 1014 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 1015 * otherwise. 1016 */ 1017 static void cp210x_change_speed(struct tty_struct *tty, 1018 struct usb_serial_port *port, struct ktermios *old_termios) 1019 { 1020 struct usb_serial *serial = port->serial; 1021 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1022 u32 baud; 1023 1024 /* 1025 * This maps the requested rate to the actual rate, a valid rate on 1026 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed]. 1027 * 1028 * NOTE: B0 is not implemented. 1029 */ 1030 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed); 1031 1032 if (priv->use_actual_rate) 1033 baud = cp210x_get_actual_rate(baud); 1034 else if (baud < 1000000) 1035 baud = cp210x_get_an205_rate(baud); 1036 1037 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 1038 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { 1039 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 1040 if (old_termios) 1041 baud = old_termios->c_ospeed; 1042 else 1043 baud = 9600; 1044 } 1045 1046 tty_encode_baud_rate(tty, baud, baud); 1047 } 1048 1049 static void cp210x_enable_event_mode(struct usb_serial_port *port) 1050 { 1051 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1052 int ret; 1053 1054 if (port_priv->event_mode) 1055 return; 1056 1057 port_priv->event_state = ES_DATA; 1058 port_priv->event_mode = true; 1059 1060 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR); 1061 if (ret) { 1062 dev_err(&port->dev, "failed to enable events: %d\n", ret); 1063 port_priv->event_mode = false; 1064 } 1065 } 1066 1067 static void cp210x_disable_event_mode(struct usb_serial_port *port) 1068 { 1069 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1070 int ret; 1071 1072 if (!port_priv->event_mode) 1073 return; 1074 1075 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0); 1076 if (ret) { 1077 dev_err(&port->dev, "failed to disable events: %d\n", ret); 1078 return; 1079 } 1080 1081 port_priv->event_mode = false; 1082 } 1083 1084 static int cp210x_set_chars(struct usb_serial_port *port, 1085 struct cp210x_special_chars *chars) 1086 { 1087 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1088 struct usb_serial *serial = port->serial; 1089 void *dmabuf; 1090 int result; 1091 1092 dmabuf = kmemdup(chars, sizeof(*chars), GFP_KERNEL); 1093 if (!dmabuf) 1094 return -ENOMEM; 1095 1096 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 1097 CP210X_SET_CHARS, REQTYPE_HOST_TO_INTERFACE, 0, 1098 port_priv->bInterfaceNumber, 1099 dmabuf, sizeof(*chars), USB_CTRL_SET_TIMEOUT); 1100 1101 kfree(dmabuf); 1102 1103 if (result < 0) { 1104 dev_err(&port->dev, "failed to set special chars: %d\n", result); 1105 return result; 1106 } 1107 1108 return 0; 1109 } 1110 1111 static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b) 1112 { 1113 bool iflag_change, cc_change; 1114 1115 iflag_change = ((a->c_iflag ^ b->c_iflag) & (INPCK | IXON | IXOFF)); 1116 cc_change = a->c_cc[VSTART] != b->c_cc[VSTART] || 1117 a->c_cc[VSTOP] != b->c_cc[VSTOP]; 1118 1119 return tty_termios_hw_change(a, b) || iflag_change || cc_change; 1120 } 1121 1122 static void cp210x_set_flow_control(struct tty_struct *tty, 1123 struct usb_serial_port *port, struct ktermios *old_termios) 1124 { 1125 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1126 struct cp210x_special_chars chars; 1127 struct cp210x_flow_ctl flow_ctl; 1128 u32 flow_repl; 1129 u32 ctl_hs; 1130 int ret; 1131 1132 if (old_termios && 1133 C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) && 1134 I_IXON(tty) == (old_termios->c_iflag & IXON) && 1135 I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) && 1136 START_CHAR(tty) == old_termios->c_cc[VSTART] && 1137 STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) { 1138 return; 1139 } 1140 1141 if (I_IXON(tty) || I_IXOFF(tty)) { 1142 memset(&chars, 0, sizeof(chars)); 1143 1144 chars.bXonChar = START_CHAR(tty); 1145 chars.bXoffChar = STOP_CHAR(tty); 1146 1147 ret = cp210x_set_chars(port, &chars); 1148 if (ret) 1149 return; 1150 } 1151 1152 mutex_lock(&port_priv->mutex); 1153 1154 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1155 sizeof(flow_ctl)); 1156 if (ret) 1157 goto out_unlock; 1158 1159 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1160 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1161 1162 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE; 1163 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE; 1164 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY; 1165 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1166 if (port_priv->dtr) 1167 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE; 1168 else 1169 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE; 1170 1171 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1172 if (C_CRTSCTS(tty)) { 1173 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE; 1174 if (port_priv->rts) 1175 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL; 1176 else 1177 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1178 port_priv->crtscts = true; 1179 } else { 1180 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE; 1181 if (port_priv->rts) 1182 flow_repl |= CP210X_SERIAL_RTS_ACTIVE; 1183 else 1184 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1185 port_priv->crtscts = false; 1186 } 1187 1188 if (I_IXOFF(tty)) 1189 flow_repl |= CP210X_SERIAL_AUTO_RECEIVE; 1190 else 1191 flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE; 1192 1193 if (I_IXON(tty)) 1194 flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT; 1195 else 1196 flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT; 1197 1198 flow_ctl.ulXonLimit = cpu_to_le32(128); 1199 flow_ctl.ulXoffLimit = cpu_to_le32(128); 1200 1201 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__, 1202 ctl_hs, flow_repl); 1203 1204 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1205 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1206 1207 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1208 sizeof(flow_ctl)); 1209 out_unlock: 1210 mutex_unlock(&port_priv->mutex); 1211 } 1212 1213 static void cp210x_set_termios(struct tty_struct *tty, 1214 struct usb_serial_port *port, struct ktermios *old_termios) 1215 { 1216 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1217 u16 bits; 1218 int ret; 1219 1220 if (old_termios && !cp210x_termios_change(&tty->termios, old_termios)) 1221 return; 1222 1223 if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed) 1224 cp210x_change_speed(tty, port, old_termios); 1225 1226 /* CP2101 only supports CS8, 1 stop bit and non-stick parity. */ 1227 if (priv->partnum == CP210X_PARTNUM_CP2101) { 1228 tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR); 1229 tty->termios.c_cflag |= CS8; 1230 } 1231 1232 bits = 0; 1233 1234 switch (C_CSIZE(tty)) { 1235 case CS5: 1236 bits |= BITS_DATA_5; 1237 break; 1238 case CS6: 1239 bits |= BITS_DATA_6; 1240 break; 1241 case CS7: 1242 bits |= BITS_DATA_7; 1243 break; 1244 case CS8: 1245 default: 1246 bits |= BITS_DATA_8; 1247 break; 1248 } 1249 1250 if (C_PARENB(tty)) { 1251 if (C_CMSPAR(tty)) { 1252 if (C_PARODD(tty)) 1253 bits |= BITS_PARITY_MARK; 1254 else 1255 bits |= BITS_PARITY_SPACE; 1256 } else { 1257 if (C_PARODD(tty)) 1258 bits |= BITS_PARITY_ODD; 1259 else 1260 bits |= BITS_PARITY_EVEN; 1261 } 1262 } 1263 1264 if (C_CSTOPB(tty)) 1265 bits |= BITS_STOP_2; 1266 else 1267 bits |= BITS_STOP_1; 1268 1269 ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1270 if (ret) 1271 dev_err(&port->dev, "failed to set line control: %d\n", ret); 1272 1273 cp210x_set_flow_control(tty, port, old_termios); 1274 1275 /* 1276 * Enable event-insertion mode only if input parity checking is 1277 * enabled for now. 1278 */ 1279 if (I_INPCK(tty)) 1280 cp210x_enable_event_mode(port); 1281 else 1282 cp210x_disable_event_mode(port); 1283 } 1284 1285 static int cp210x_tiocmset(struct tty_struct *tty, 1286 unsigned int set, unsigned int clear) 1287 { 1288 struct usb_serial_port *port = tty->driver_data; 1289 return cp210x_tiocmset_port(port, set, clear); 1290 } 1291 1292 static int cp210x_tiocmset_port(struct usb_serial_port *port, 1293 unsigned int set, unsigned int clear) 1294 { 1295 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1296 struct cp210x_flow_ctl flow_ctl; 1297 u32 ctl_hs, flow_repl; 1298 u16 control = 0; 1299 int ret; 1300 1301 mutex_lock(&port_priv->mutex); 1302 1303 if (set & TIOCM_RTS) { 1304 port_priv->rts = true; 1305 control |= CONTROL_RTS; 1306 control |= CONTROL_WRITE_RTS; 1307 } 1308 if (set & TIOCM_DTR) { 1309 port_priv->dtr = true; 1310 control |= CONTROL_DTR; 1311 control |= CONTROL_WRITE_DTR; 1312 } 1313 if (clear & TIOCM_RTS) { 1314 port_priv->rts = false; 1315 control &= ~CONTROL_RTS; 1316 control |= CONTROL_WRITE_RTS; 1317 } 1318 if (clear & TIOCM_DTR) { 1319 port_priv->dtr = false; 1320 control &= ~CONTROL_DTR; 1321 control |= CONTROL_WRITE_DTR; 1322 } 1323 1324 /* 1325 * Use SET_FLOW to set DTR and enable/disable auto-RTS when hardware 1326 * flow control is enabled. 1327 */ 1328 if (port_priv->crtscts && control & CONTROL_WRITE_RTS) { 1329 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1330 sizeof(flow_ctl)); 1331 if (ret) 1332 goto out_unlock; 1333 1334 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1335 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1336 1337 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1338 if (port_priv->dtr) 1339 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE; 1340 else 1341 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE; 1342 1343 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1344 if (port_priv->rts) 1345 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL; 1346 else 1347 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1348 1349 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1350 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1351 1352 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", 1353 __func__, ctl_hs, flow_repl); 1354 1355 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1356 sizeof(flow_ctl)); 1357 } else { 1358 dev_dbg(&port->dev, "%s - control = 0x%04x\n", __func__, control); 1359 1360 ret = cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1361 } 1362 out_unlock: 1363 mutex_unlock(&port_priv->mutex); 1364 1365 return ret; 1366 } 1367 1368 static void cp210x_dtr_rts(struct usb_serial_port *port, int on) 1369 { 1370 if (on) 1371 cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0); 1372 else 1373 cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS); 1374 } 1375 1376 static int cp210x_tiocmget(struct tty_struct *tty) 1377 { 1378 struct usb_serial_port *port = tty->driver_data; 1379 u8 control; 1380 int result; 1381 1382 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1383 if (result) 1384 return result; 1385 1386 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1387 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1388 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1389 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1390 |((control & CONTROL_RING)? TIOCM_RI : 0) 1391 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1392 1393 dev_dbg(&port->dev, "%s - control = 0x%02x\n", __func__, control); 1394 1395 return result; 1396 } 1397 1398 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 1399 { 1400 struct usb_serial_port *port = tty->driver_data; 1401 u16 state; 1402 1403 if (break_state == 0) 1404 state = BREAK_OFF; 1405 else 1406 state = BREAK_ON; 1407 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1408 state == BREAK_OFF ? "off" : "on"); 1409 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1410 } 1411 1412 #ifdef CONFIG_GPIOLIB 1413 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio) 1414 { 1415 struct usb_serial *serial = gpiochip_get_data(gc); 1416 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1417 u8 req_type = REQTYPE_DEVICE_TO_HOST; 1418 int result; 1419 u8 buf; 1420 1421 if (priv->partnum == CP210X_PARTNUM_CP2105) 1422 req_type = REQTYPE_INTERFACE_TO_HOST; 1423 1424 result = usb_autopm_get_interface(serial->interface); 1425 if (result) 1426 return result; 1427 1428 result = cp210x_read_vendor_block(serial, req_type, 1429 CP210X_READ_LATCH, &buf, sizeof(buf)); 1430 usb_autopm_put_interface(serial->interface); 1431 if (result < 0) 1432 return result; 1433 1434 return !!(buf & BIT(gpio)); 1435 } 1436 1437 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value) 1438 { 1439 struct usb_serial *serial = gpiochip_get_data(gc); 1440 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1441 struct cp210x_gpio_write buf; 1442 int result; 1443 1444 if (value == 1) 1445 buf.state = BIT(gpio); 1446 else 1447 buf.state = 0; 1448 1449 buf.mask = BIT(gpio); 1450 1451 result = usb_autopm_get_interface(serial->interface); 1452 if (result) 1453 goto out; 1454 1455 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1456 result = cp210x_write_vendor_block(serial, 1457 REQTYPE_HOST_TO_INTERFACE, 1458 CP210X_WRITE_LATCH, &buf, 1459 sizeof(buf)); 1460 } else { 1461 u16 wIndex = buf.state << 8 | buf.mask; 1462 1463 result = usb_control_msg(serial->dev, 1464 usb_sndctrlpipe(serial->dev, 0), 1465 CP210X_VENDOR_SPECIFIC, 1466 REQTYPE_HOST_TO_DEVICE, 1467 CP210X_WRITE_LATCH, 1468 wIndex, 1469 NULL, 0, USB_CTRL_SET_TIMEOUT); 1470 } 1471 1472 usb_autopm_put_interface(serial->interface); 1473 out: 1474 if (result < 0) { 1475 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n", 1476 result); 1477 } 1478 } 1479 1480 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio) 1481 { 1482 struct usb_serial *serial = gpiochip_get_data(gc); 1483 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1484 1485 return priv->gpio_input & BIT(gpio); 1486 } 1487 1488 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio) 1489 { 1490 struct usb_serial *serial = gpiochip_get_data(gc); 1491 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1492 1493 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1494 /* hardware does not support an input mode */ 1495 return -ENOTSUPP; 1496 } 1497 1498 /* push-pull pins cannot be changed to be inputs */ 1499 if (priv->gpio_pushpull & BIT(gpio)) 1500 return -EINVAL; 1501 1502 /* make sure to release pin if it is being driven low */ 1503 cp210x_gpio_set(gc, gpio, 1); 1504 1505 priv->gpio_input |= BIT(gpio); 1506 1507 return 0; 1508 } 1509 1510 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio, 1511 int value) 1512 { 1513 struct usb_serial *serial = gpiochip_get_data(gc); 1514 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1515 1516 priv->gpio_input &= ~BIT(gpio); 1517 cp210x_gpio_set(gc, gpio, value); 1518 1519 return 0; 1520 } 1521 1522 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio, 1523 unsigned long config) 1524 { 1525 struct usb_serial *serial = gpiochip_get_data(gc); 1526 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1527 enum pin_config_param param = pinconf_to_config_param(config); 1528 1529 /* Succeed only if in correct mode (this can't be set at runtime) */ 1530 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) && 1531 (priv->gpio_pushpull & BIT(gpio))) 1532 return 0; 1533 1534 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) && 1535 !(priv->gpio_pushpull & BIT(gpio))) 1536 return 0; 1537 1538 return -ENOTSUPP; 1539 } 1540 1541 static int cp210x_gpio_init_valid_mask(struct gpio_chip *gc, 1542 unsigned long *valid_mask, unsigned int ngpios) 1543 { 1544 struct usb_serial *serial = gpiochip_get_data(gc); 1545 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1546 struct device *dev = &serial->interface->dev; 1547 unsigned long altfunc_mask = priv->gpio_altfunc; 1548 1549 bitmap_complement(valid_mask, &altfunc_mask, ngpios); 1550 1551 if (bitmap_empty(valid_mask, ngpios)) 1552 dev_dbg(dev, "no pin configured for GPIO\n"); 1553 else 1554 dev_dbg(dev, "GPIO.%*pbl configured for GPIO\n", ngpios, 1555 valid_mask); 1556 return 0; 1557 } 1558 1559 /* 1560 * This function is for configuring GPIO using shared pins, where other signals 1561 * are made unavailable by configuring the use of GPIO. This is believed to be 1562 * only applicable to the cp2105 at this point, the other devices supported by 1563 * this driver that provide GPIO do so in a way that does not impact other 1564 * signals and are thus expected to have very different initialisation. 1565 */ 1566 static int cp2105_gpioconf_init(struct usb_serial *serial) 1567 { 1568 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1569 struct cp210x_pin_mode mode; 1570 struct cp210x_dual_port_config config; 1571 u8 intf_num = cp210x_interface_num(serial); 1572 u8 iface_config; 1573 int result; 1574 1575 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1576 CP210X_GET_DEVICEMODE, &mode, 1577 sizeof(mode)); 1578 if (result < 0) 1579 return result; 1580 1581 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1582 CP210X_GET_PORTCONFIG, &config, 1583 sizeof(config)); 1584 if (result < 0) 1585 return result; 1586 1587 /* 2 banks of GPIO - One for the pins taken from each serial port */ 1588 if (intf_num == 0) { 1589 if (mode.eci == CP210X_PIN_MODE_MODEM) { 1590 /* mark all GPIOs of this interface as reserved */ 1591 priv->gpio_altfunc = 0xff; 1592 return 0; 1593 } 1594 1595 iface_config = config.eci_cfg; 1596 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1597 CP210X_ECI_GPIO_MODE_MASK) >> 1598 CP210X_ECI_GPIO_MODE_OFFSET); 1599 priv->gc.ngpio = 2; 1600 } else if (intf_num == 1) { 1601 if (mode.sci == CP210X_PIN_MODE_MODEM) { 1602 /* mark all GPIOs of this interface as reserved */ 1603 priv->gpio_altfunc = 0xff; 1604 return 0; 1605 } 1606 1607 iface_config = config.sci_cfg; 1608 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1609 CP210X_SCI_GPIO_MODE_MASK) >> 1610 CP210X_SCI_GPIO_MODE_OFFSET); 1611 priv->gc.ngpio = 3; 1612 } else { 1613 return -ENODEV; 1614 } 1615 1616 /* mark all pins which are not in GPIO mode */ 1617 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */ 1618 priv->gpio_altfunc |= BIT(0); 1619 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */ 1620 CP2105_GPIO1_RS485_MODE)) 1621 priv->gpio_altfunc |= BIT(1); 1622 1623 /* driver implementation for CP2105 only supports outputs */ 1624 priv->gpio_input = 0; 1625 1626 return 0; 1627 } 1628 1629 static int cp2104_gpioconf_init(struct usb_serial *serial) 1630 { 1631 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1632 struct cp210x_single_port_config config; 1633 u8 iface_config; 1634 u8 gpio_latch; 1635 int result; 1636 u8 i; 1637 1638 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1639 CP210X_GET_PORTCONFIG, &config, 1640 sizeof(config)); 1641 if (result < 0) 1642 return result; 1643 1644 priv->gc.ngpio = 4; 1645 1646 iface_config = config.device_cfg; 1647 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1648 CP210X_GPIO_MODE_MASK) >> 1649 CP210X_GPIO_MODE_OFFSET); 1650 gpio_latch = (u8)((le16_to_cpu(config.reset_state) & 1651 CP210X_GPIO_MODE_MASK) >> 1652 CP210X_GPIO_MODE_OFFSET); 1653 1654 /* mark all pins which are not in GPIO mode */ 1655 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */ 1656 priv->gpio_altfunc |= BIT(0); 1657 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */ 1658 priv->gpio_altfunc |= BIT(1); 1659 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */ 1660 priv->gpio_altfunc |= BIT(2); 1661 1662 /* 1663 * Like CP2102N, CP2104 has also no strict input and output pin 1664 * modes. 1665 * Do the same input mode emulation as CP2102N. 1666 */ 1667 for (i = 0; i < priv->gc.ngpio; ++i) { 1668 /* 1669 * Set direction to "input" iff pin is open-drain and reset 1670 * value is 1. 1671 */ 1672 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1673 priv->gpio_input |= BIT(i); 1674 } 1675 1676 return 0; 1677 } 1678 1679 static int cp2102n_gpioconf_init(struct usb_serial *serial) 1680 { 1681 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1682 const u16 config_size = 0x02a6; 1683 u8 gpio_rst_latch; 1684 u8 config_version; 1685 u8 gpio_pushpull; 1686 u8 *config_buf; 1687 u8 gpio_latch; 1688 u8 gpio_ctrl; 1689 int result; 1690 u8 i; 1691 1692 /* 1693 * Retrieve device configuration from the device. 1694 * The array received contains all customization settings done at the 1695 * factory/manufacturer. Format of the array is documented at the 1696 * time of writing at: 1697 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa 1698 */ 1699 config_buf = kmalloc(config_size, GFP_KERNEL); 1700 if (!config_buf) 1701 return -ENOMEM; 1702 1703 result = cp210x_read_vendor_block(serial, 1704 REQTYPE_DEVICE_TO_HOST, 1705 CP210X_READ_2NCONFIG, 1706 config_buf, 1707 config_size); 1708 if (result < 0) { 1709 kfree(config_buf); 1710 return result; 1711 } 1712 1713 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX]; 1714 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX]; 1715 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX]; 1716 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX]; 1717 1718 kfree(config_buf); 1719 1720 /* Make sure this is a config format we understand. */ 1721 if (config_version != 0x01) 1722 return -ENOTSUPP; 1723 1724 priv->gc.ngpio = 4; 1725 1726 /* 1727 * Get default pin states after reset. Needed so we can determine 1728 * the direction of an open-drain pin. 1729 */ 1730 gpio_latch = (gpio_rst_latch >> 3) & 0x0f; 1731 1732 /* 0 indicates open-drain mode, 1 is push-pull */ 1733 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f; 1734 1735 /* 0 indicates GPIO mode, 1 is alternate function */ 1736 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f; 1737 1738 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) { 1739 /* 1740 * For the QFN28 package, GPIO4-6 are controlled by 1741 * the low three bits of the mode/latch fields. 1742 * Contrary to the document linked above, the bits for 1743 * the SUSPEND pins are elsewhere. No alternate 1744 * function is available for these pins. 1745 */ 1746 priv->gc.ngpio = 7; 1747 gpio_latch |= (gpio_rst_latch & 7) << 4; 1748 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4; 1749 } 1750 1751 /* 1752 * The CP2102N does not strictly has input and output pin modes, 1753 * it only knows open-drain and push-pull modes which is set at 1754 * factory. An open-drain pin can function both as an 1755 * input or an output. We emulate input mode for open-drain pins 1756 * by making sure they are not driven low, and we do not allow 1757 * push-pull pins to be set as an input. 1758 */ 1759 for (i = 0; i < priv->gc.ngpio; ++i) { 1760 /* 1761 * Set direction to "input" iff pin is open-drain and reset 1762 * value is 1. 1763 */ 1764 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1765 priv->gpio_input |= BIT(i); 1766 } 1767 1768 return 0; 1769 } 1770 1771 static int cp210x_gpio_init(struct usb_serial *serial) 1772 { 1773 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1774 int result; 1775 1776 switch (priv->partnum) { 1777 case CP210X_PARTNUM_CP2104: 1778 result = cp2104_gpioconf_init(serial); 1779 break; 1780 case CP210X_PARTNUM_CP2105: 1781 result = cp2105_gpioconf_init(serial); 1782 break; 1783 case CP210X_PARTNUM_CP2102N_QFN28: 1784 case CP210X_PARTNUM_CP2102N_QFN24: 1785 case CP210X_PARTNUM_CP2102N_QFN20: 1786 result = cp2102n_gpioconf_init(serial); 1787 break; 1788 default: 1789 return 0; 1790 } 1791 1792 if (result < 0) 1793 return result; 1794 1795 priv->gc.label = "cp210x"; 1796 priv->gc.get_direction = cp210x_gpio_direction_get; 1797 priv->gc.direction_input = cp210x_gpio_direction_input; 1798 priv->gc.direction_output = cp210x_gpio_direction_output; 1799 priv->gc.get = cp210x_gpio_get; 1800 priv->gc.set = cp210x_gpio_set; 1801 priv->gc.set_config = cp210x_gpio_set_config; 1802 priv->gc.init_valid_mask = cp210x_gpio_init_valid_mask; 1803 priv->gc.owner = THIS_MODULE; 1804 priv->gc.parent = &serial->interface->dev; 1805 priv->gc.base = -1; 1806 priv->gc.can_sleep = true; 1807 1808 result = gpiochip_add_data(&priv->gc, serial); 1809 if (!result) 1810 priv->gpio_registered = true; 1811 1812 return result; 1813 } 1814 1815 static void cp210x_gpio_remove(struct usb_serial *serial) 1816 { 1817 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1818 1819 if (priv->gpio_registered) { 1820 gpiochip_remove(&priv->gc); 1821 priv->gpio_registered = false; 1822 } 1823 } 1824 1825 #else 1826 1827 static int cp210x_gpio_init(struct usb_serial *serial) 1828 { 1829 return 0; 1830 } 1831 1832 static void cp210x_gpio_remove(struct usb_serial *serial) 1833 { 1834 /* Nothing to do */ 1835 } 1836 1837 #endif 1838 1839 static int cp210x_port_probe(struct usb_serial_port *port) 1840 { 1841 struct usb_serial *serial = port->serial; 1842 struct cp210x_port_private *port_priv; 1843 1844 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 1845 if (!port_priv) 1846 return -ENOMEM; 1847 1848 port_priv->bInterfaceNumber = cp210x_interface_num(serial); 1849 mutex_init(&port_priv->mutex); 1850 1851 usb_set_serial_port_data(port, port_priv); 1852 1853 return 0; 1854 } 1855 1856 static void cp210x_port_remove(struct usb_serial_port *port) 1857 { 1858 struct cp210x_port_private *port_priv; 1859 1860 port_priv = usb_get_serial_port_data(port); 1861 kfree(port_priv); 1862 } 1863 1864 static void cp210x_init_max_speed(struct usb_serial *serial) 1865 { 1866 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1867 bool use_actual_rate = false; 1868 speed_t min = 300; 1869 speed_t max; 1870 1871 switch (priv->partnum) { 1872 case CP210X_PARTNUM_CP2101: 1873 max = 921600; 1874 break; 1875 case CP210X_PARTNUM_CP2102: 1876 case CP210X_PARTNUM_CP2103: 1877 max = 1000000; 1878 break; 1879 case CP210X_PARTNUM_CP2104: 1880 use_actual_rate = true; 1881 max = 2000000; 1882 break; 1883 case CP210X_PARTNUM_CP2108: 1884 max = 2000000; 1885 break; 1886 case CP210X_PARTNUM_CP2105: 1887 if (cp210x_interface_num(serial) == 0) { 1888 use_actual_rate = true; 1889 max = 2000000; /* ECI */ 1890 } else { 1891 min = 2400; 1892 max = 921600; /* SCI */ 1893 } 1894 break; 1895 case CP210X_PARTNUM_CP2102N_QFN28: 1896 case CP210X_PARTNUM_CP2102N_QFN24: 1897 case CP210X_PARTNUM_CP2102N_QFN20: 1898 use_actual_rate = true; 1899 max = 3000000; 1900 break; 1901 default: 1902 max = 2000000; 1903 break; 1904 } 1905 1906 priv->min_speed = min; 1907 priv->max_speed = max; 1908 priv->use_actual_rate = use_actual_rate; 1909 } 1910 1911 static int cp210x_attach(struct usb_serial *serial) 1912 { 1913 int result; 1914 struct cp210x_serial_private *priv; 1915 1916 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1917 if (!priv) 1918 return -ENOMEM; 1919 1920 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1921 CP210X_GET_PARTNUM, &priv->partnum, 1922 sizeof(priv->partnum)); 1923 if (result < 0) { 1924 dev_warn(&serial->interface->dev, 1925 "querying part number failed\n"); 1926 priv->partnum = CP210X_PARTNUM_UNKNOWN; 1927 } 1928 1929 usb_set_serial_data(serial, priv); 1930 1931 cp210x_init_max_speed(serial); 1932 1933 result = cp210x_gpio_init(serial); 1934 if (result < 0) { 1935 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n", 1936 result); 1937 } 1938 1939 return 0; 1940 } 1941 1942 static void cp210x_disconnect(struct usb_serial *serial) 1943 { 1944 cp210x_gpio_remove(serial); 1945 } 1946 1947 static void cp210x_release(struct usb_serial *serial) 1948 { 1949 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1950 1951 cp210x_gpio_remove(serial); 1952 1953 kfree(priv); 1954 } 1955 1956 module_usb_serial_driver(serial_drivers, id_table); 1957 1958 MODULE_DESCRIPTION(DRIVER_DESC); 1959 MODULE_LICENSE("GPL v2"); 1960