1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Silicon Laboratories CP210x USB to RS232 serial adaptor driver 4 * 5 * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk) 6 * 7 * Support to set flow control line levels using TIOCMGET and TIOCMSET 8 * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow 9 * control thanks to Munir Nassar nassarmu@real-time.com 10 * 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/errno.h> 15 #include <linux/slab.h> 16 #include <linux/tty.h> 17 #include <linux/tty_flip.h> 18 #include <linux/module.h> 19 #include <linux/moduleparam.h> 20 #include <linux/usb.h> 21 #include <linux/uaccess.h> 22 #include <linux/usb/serial.h> 23 #include <linux/gpio/driver.h> 24 #include <linux/bitops.h> 25 #include <linux/mutex.h> 26 27 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver" 28 29 /* 30 * Function Prototypes 31 */ 32 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *); 33 static void cp210x_close(struct usb_serial_port *); 34 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *, 35 struct ktermios *); 36 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *, 37 struct ktermios*); 38 static bool cp210x_tx_empty(struct usb_serial_port *port); 39 static int cp210x_tiocmget(struct tty_struct *); 40 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int); 41 static int cp210x_tiocmset_port(struct usb_serial_port *port, 42 unsigned int, unsigned int); 43 static void cp210x_break_ctl(struct tty_struct *, int); 44 static int cp210x_attach(struct usb_serial *); 45 static void cp210x_disconnect(struct usb_serial *); 46 static void cp210x_release(struct usb_serial *); 47 static int cp210x_port_probe(struct usb_serial_port *); 48 static int cp210x_port_remove(struct usb_serial_port *); 49 static void cp210x_dtr_rts(struct usb_serial_port *port, int on); 50 static void cp210x_process_read_urb(struct urb *urb); 51 static void cp210x_enable_event_mode(struct usb_serial_port *port); 52 static void cp210x_disable_event_mode(struct usb_serial_port *port); 53 54 static const struct usb_device_id id_table[] = { 55 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */ 56 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */ 57 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 58 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 59 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */ 60 { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */ 61 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */ 62 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */ 63 { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */ 64 { USB_DEVICE(0x0988, 0x0578) }, /* Teraoka AD2000 */ 65 { USB_DEVICE(0x0B00, 0x3070) }, /* Ingenico 3070 */ 66 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */ 67 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */ 68 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */ 69 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */ 70 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */ 71 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */ 72 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */ 73 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */ 74 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */ 75 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */ 76 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */ 77 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */ 78 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */ 79 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */ 80 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */ 81 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */ 82 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */ 83 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */ 84 { USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */ 85 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */ 86 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */ 87 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */ 88 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */ 89 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */ 90 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */ 91 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */ 92 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */ 93 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */ 94 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */ 95 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */ 96 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */ 97 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */ 98 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */ 99 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */ 100 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */ 101 { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */ 102 { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */ 103 { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */ 104 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */ 105 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */ 106 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */ 107 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */ 108 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */ 109 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */ 110 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */ 111 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */ 112 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */ 113 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */ 114 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */ 115 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */ 116 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */ 117 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */ 118 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */ 119 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */ 120 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */ 121 { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */ 122 { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */ 123 { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */ 124 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */ 125 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */ 126 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */ 127 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */ 128 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */ 129 { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */ 130 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */ 131 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ 132 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ 133 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 134 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */ 135 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ 136 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */ 137 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */ 138 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */ 139 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */ 140 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ 141 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ 142 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */ 143 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 144 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 145 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */ 146 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */ 147 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */ 148 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */ 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(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */ 206 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */ 207 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */ 208 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */ 209 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */ 210 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 211 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */ 212 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 213 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 214 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 215 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 216 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 217 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 218 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 219 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 220 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 221 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 222 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 223 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 224 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 225 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 226 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 227 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 228 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 229 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 230 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 231 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 232 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 233 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */ 234 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 235 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 236 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 237 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */ 238 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 239 { } /* Terminating Entry */ 240 }; 241 242 MODULE_DEVICE_TABLE(usb, id_table); 243 244 struct cp210x_serial_private { 245 #ifdef CONFIG_GPIOLIB 246 struct gpio_chip gc; 247 bool gpio_registered; 248 u8 gpio_pushpull; 249 u8 gpio_altfunc; 250 u8 gpio_input; 251 #endif 252 u8 partnum; 253 speed_t min_speed; 254 speed_t max_speed; 255 bool use_actual_rate; 256 }; 257 258 enum cp210x_event_state { 259 ES_DATA, 260 ES_ESCAPE, 261 ES_LSR, 262 ES_LSR_DATA_0, 263 ES_LSR_DATA_1, 264 ES_MSR 265 }; 266 267 struct cp210x_port_private { 268 u8 bInterfaceNumber; 269 bool event_mode; 270 enum cp210x_event_state event_state; 271 u8 lsr; 272 }; 273 274 static struct usb_serial_driver cp210x_device = { 275 .driver = { 276 .owner = THIS_MODULE, 277 .name = "cp210x", 278 }, 279 .id_table = id_table, 280 .num_ports = 1, 281 .bulk_in_size = 256, 282 .bulk_out_size = 256, 283 .open = cp210x_open, 284 .close = cp210x_close, 285 .break_ctl = cp210x_break_ctl, 286 .set_termios = cp210x_set_termios, 287 .tx_empty = cp210x_tx_empty, 288 .throttle = usb_serial_generic_throttle, 289 .unthrottle = usb_serial_generic_unthrottle, 290 .tiocmget = cp210x_tiocmget, 291 .tiocmset = cp210x_tiocmset, 292 .get_icount = usb_serial_generic_get_icount, 293 .attach = cp210x_attach, 294 .disconnect = cp210x_disconnect, 295 .release = cp210x_release, 296 .port_probe = cp210x_port_probe, 297 .port_remove = cp210x_port_remove, 298 .dtr_rts = cp210x_dtr_rts, 299 .process_read_urb = cp210x_process_read_urb, 300 }; 301 302 static struct usb_serial_driver * const serial_drivers[] = { 303 &cp210x_device, NULL 304 }; 305 306 /* Config request types */ 307 #define REQTYPE_HOST_TO_INTERFACE 0x41 308 #define REQTYPE_INTERFACE_TO_HOST 0xc1 309 #define REQTYPE_HOST_TO_DEVICE 0x40 310 #define REQTYPE_DEVICE_TO_HOST 0xc0 311 312 /* Config request codes */ 313 #define CP210X_IFC_ENABLE 0x00 314 #define CP210X_SET_BAUDDIV 0x01 315 #define CP210X_GET_BAUDDIV 0x02 316 #define CP210X_SET_LINE_CTL 0x03 317 #define CP210X_GET_LINE_CTL 0x04 318 #define CP210X_SET_BREAK 0x05 319 #define CP210X_IMM_CHAR 0x06 320 #define CP210X_SET_MHS 0x07 321 #define CP210X_GET_MDMSTS 0x08 322 #define CP210X_SET_XON 0x09 323 #define CP210X_SET_XOFF 0x0A 324 #define CP210X_SET_EVENTMASK 0x0B 325 #define CP210X_GET_EVENTMASK 0x0C 326 #define CP210X_SET_CHAR 0x0D 327 #define CP210X_GET_CHARS 0x0E 328 #define CP210X_GET_PROPS 0x0F 329 #define CP210X_GET_COMM_STATUS 0x10 330 #define CP210X_RESET 0x11 331 #define CP210X_PURGE 0x12 332 #define CP210X_SET_FLOW 0x13 333 #define CP210X_GET_FLOW 0x14 334 #define CP210X_EMBED_EVENTS 0x15 335 #define CP210X_GET_EVENTSTATE 0x16 336 #define CP210X_SET_CHARS 0x19 337 #define CP210X_GET_BAUDRATE 0x1D 338 #define CP210X_SET_BAUDRATE 0x1E 339 #define CP210X_VENDOR_SPECIFIC 0xFF 340 341 /* CP210X_IFC_ENABLE */ 342 #define UART_ENABLE 0x0001 343 #define UART_DISABLE 0x0000 344 345 /* CP210X_(SET|GET)_BAUDDIV */ 346 #define BAUD_RATE_GEN_FREQ 0x384000 347 348 /* CP210X_(SET|GET)_LINE_CTL */ 349 #define BITS_DATA_MASK 0X0f00 350 #define BITS_DATA_5 0X0500 351 #define BITS_DATA_6 0X0600 352 #define BITS_DATA_7 0X0700 353 #define BITS_DATA_8 0X0800 354 #define BITS_DATA_9 0X0900 355 356 #define BITS_PARITY_MASK 0x00f0 357 #define BITS_PARITY_NONE 0x0000 358 #define BITS_PARITY_ODD 0x0010 359 #define BITS_PARITY_EVEN 0x0020 360 #define BITS_PARITY_MARK 0x0030 361 #define BITS_PARITY_SPACE 0x0040 362 363 #define BITS_STOP_MASK 0x000f 364 #define BITS_STOP_1 0x0000 365 #define BITS_STOP_1_5 0x0001 366 #define BITS_STOP_2 0x0002 367 368 /* CP210X_SET_BREAK */ 369 #define BREAK_ON 0x0001 370 #define BREAK_OFF 0x0000 371 372 /* CP210X_(SET_MHS|GET_MDMSTS) */ 373 #define CONTROL_DTR 0x0001 374 #define CONTROL_RTS 0x0002 375 #define CONTROL_CTS 0x0010 376 #define CONTROL_DSR 0x0020 377 #define CONTROL_RING 0x0040 378 #define CONTROL_DCD 0x0080 379 #define CONTROL_WRITE_DTR 0x0100 380 #define CONTROL_WRITE_RTS 0x0200 381 382 /* CP210X_VENDOR_SPECIFIC values */ 383 #define CP210X_READ_2NCONFIG 0x000E 384 #define CP210X_READ_LATCH 0x00C2 385 #define CP210X_GET_PARTNUM 0x370B 386 #define CP210X_GET_PORTCONFIG 0x370C 387 #define CP210X_GET_DEVICEMODE 0x3711 388 #define CP210X_WRITE_LATCH 0x37E1 389 390 /* Part number definitions */ 391 #define CP210X_PARTNUM_CP2101 0x01 392 #define CP210X_PARTNUM_CP2102 0x02 393 #define CP210X_PARTNUM_CP2103 0x03 394 #define CP210X_PARTNUM_CP2104 0x04 395 #define CP210X_PARTNUM_CP2105 0x05 396 #define CP210X_PARTNUM_CP2108 0x08 397 #define CP210X_PARTNUM_CP2102N_QFN28 0x20 398 #define CP210X_PARTNUM_CP2102N_QFN24 0x21 399 #define CP210X_PARTNUM_CP2102N_QFN20 0x22 400 #define CP210X_PARTNUM_UNKNOWN 0xFF 401 402 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 403 struct cp210x_comm_status { 404 __le32 ulErrors; 405 __le32 ulHoldReasons; 406 __le32 ulAmountInInQueue; 407 __le32 ulAmountInOutQueue; 408 u8 bEofReceived; 409 u8 bWaitForImmediate; 410 u8 bReserved; 411 } __packed; 412 413 /* 414 * CP210X_PURGE - 16 bits passed in wValue of USB request. 415 * SiLabs app note AN571 gives a strange description of the 4 bits: 416 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 417 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 418 */ 419 #define PURGE_ALL 0x000f 420 421 /* CP210X_EMBED_EVENTS */ 422 #define CP210X_ESCCHAR 0xec 423 424 #define CP210X_LSR_OVERRUN BIT(1) 425 #define CP210X_LSR_PARITY BIT(2) 426 #define CP210X_LSR_FRAME BIT(3) 427 #define CP210X_LSR_BREAK BIT(4) 428 429 430 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */ 431 struct cp210x_flow_ctl { 432 __le32 ulControlHandshake; 433 __le32 ulFlowReplace; 434 __le32 ulXonLimit; 435 __le32 ulXoffLimit; 436 }; 437 438 /* cp210x_flow_ctl::ulControlHandshake */ 439 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0) 440 #define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode) 441 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3) 442 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4) 443 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5) 444 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6) 445 446 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */ 447 #define CP210X_SERIAL_DTR_INACTIVE 0 448 #define CP210X_SERIAL_DTR_ACTIVE 1 449 #define CP210X_SERIAL_DTR_FLOW_CTL 2 450 451 /* cp210x_flow_ctl::ulFlowReplace */ 452 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0) 453 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1) 454 #define CP210X_SERIAL_ERROR_CHAR BIT(2) 455 #define CP210X_SERIAL_NULL_STRIPPING BIT(3) 456 #define CP210X_SERIAL_BREAK_CHAR BIT(4) 457 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6) 458 #define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6) 459 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31) 460 461 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */ 462 #define CP210X_SERIAL_RTS_INACTIVE 0 463 #define CP210X_SERIAL_RTS_ACTIVE 1 464 #define CP210X_SERIAL_RTS_FLOW_CTL 2 465 466 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */ 467 struct cp210x_pin_mode { 468 u8 eci; 469 u8 sci; 470 }; 471 472 #define CP210X_PIN_MODE_MODEM 0 473 #define CP210X_PIN_MODE_GPIO BIT(0) 474 475 /* 476 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes 477 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes. 478 */ 479 struct cp210x_dual_port_config { 480 __le16 gpio_mode; 481 u8 __pad0[2]; 482 __le16 reset_state; 483 u8 __pad1[4]; 484 __le16 suspend_state; 485 u8 sci_cfg; 486 u8 eci_cfg; 487 u8 device_cfg; 488 } __packed; 489 490 /* 491 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes 492 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes. 493 */ 494 struct cp210x_single_port_config { 495 __le16 gpio_mode; 496 u8 __pad0[2]; 497 __le16 reset_state; 498 u8 __pad1[4]; 499 __le16 suspend_state; 500 u8 device_cfg; 501 } __packed; 502 503 /* GPIO modes */ 504 #define CP210X_SCI_GPIO_MODE_OFFSET 9 505 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9) 506 507 #define CP210X_ECI_GPIO_MODE_OFFSET 2 508 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2) 509 510 #define CP210X_GPIO_MODE_OFFSET 8 511 #define CP210X_GPIO_MODE_MASK GENMASK(11, 8) 512 513 /* CP2105 port configuration values */ 514 #define CP2105_GPIO0_TXLED_MODE BIT(0) 515 #define CP2105_GPIO1_RXLED_MODE BIT(1) 516 #define CP2105_GPIO1_RS485_MODE BIT(2) 517 518 /* CP2104 port configuration values */ 519 #define CP2104_GPIO0_TXLED_MODE BIT(0) 520 #define CP2104_GPIO1_RXLED_MODE BIT(1) 521 #define CP2104_GPIO2_RS485_MODE BIT(2) 522 523 /* CP2102N configuration array indices */ 524 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2 525 #define CP210X_2NCONFIG_GPIO_MODE_IDX 581 526 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587 527 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600 528 529 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */ 530 struct cp210x_gpio_write { 531 u8 mask; 532 u8 state; 533 }; 534 535 /* 536 * Helper to get interface number when we only have struct usb_serial. 537 */ 538 static u8 cp210x_interface_num(struct usb_serial *serial) 539 { 540 struct usb_host_interface *cur_altsetting; 541 542 cur_altsetting = serial->interface->cur_altsetting; 543 544 return cur_altsetting->desc.bInterfaceNumber; 545 } 546 547 /* 548 * Reads a variable-sized block of CP210X_ registers, identified by req. 549 * Returns data into buf in native USB byte order. 550 */ 551 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, 552 void *buf, int bufsize) 553 { 554 struct usb_serial *serial = port->serial; 555 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 556 void *dmabuf; 557 int result; 558 559 dmabuf = kmalloc(bufsize, GFP_KERNEL); 560 if (!dmabuf) 561 return -ENOMEM; 562 563 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 564 req, REQTYPE_INTERFACE_TO_HOST, 0, 565 port_priv->bInterfaceNumber, dmabuf, bufsize, 566 USB_CTRL_SET_TIMEOUT); 567 if (result == bufsize) { 568 memcpy(buf, dmabuf, bufsize); 569 result = 0; 570 } else { 571 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", 572 req, bufsize, result); 573 if (result >= 0) 574 result = -EIO; 575 } 576 577 kfree(dmabuf); 578 579 return result; 580 } 581 582 /* 583 * Reads any 8-bit CP210X_ register identified by req. 584 */ 585 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val) 586 { 587 return cp210x_read_reg_block(port, req, val, sizeof(*val)); 588 } 589 590 /* 591 * Reads a variable-sized vendor block of CP210X_ registers, identified by val. 592 * Returns data into buf in native USB byte order. 593 */ 594 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val, 595 void *buf, int bufsize) 596 { 597 void *dmabuf; 598 int result; 599 600 dmabuf = kmalloc(bufsize, GFP_KERNEL); 601 if (!dmabuf) 602 return -ENOMEM; 603 604 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 605 CP210X_VENDOR_SPECIFIC, type, val, 606 cp210x_interface_num(serial), dmabuf, bufsize, 607 USB_CTRL_GET_TIMEOUT); 608 if (result == bufsize) { 609 memcpy(buf, dmabuf, bufsize); 610 result = 0; 611 } else { 612 dev_err(&serial->interface->dev, 613 "failed to get vendor val 0x%04x size %d: %d\n", val, 614 bufsize, result); 615 if (result >= 0) 616 result = -EIO; 617 } 618 619 kfree(dmabuf); 620 621 return result; 622 } 623 624 /* 625 * Writes any 16-bit CP210X_ register (req) whose value is passed 626 * entirely in the wValue field of the USB request. 627 */ 628 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) 629 { 630 struct usb_serial *serial = port->serial; 631 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 632 int result; 633 634 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 635 req, REQTYPE_HOST_TO_INTERFACE, val, 636 port_priv->bInterfaceNumber, NULL, 0, 637 USB_CTRL_SET_TIMEOUT); 638 if (result < 0) { 639 dev_err(&port->dev, "failed set request 0x%x status: %d\n", 640 req, result); 641 } 642 643 return result; 644 } 645 646 /* 647 * Writes a variable-sized block of CP210X_ registers, identified by req. 648 * Data in buf must be in native USB byte order. 649 */ 650 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req, 651 void *buf, int bufsize) 652 { 653 struct usb_serial *serial = port->serial; 654 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 655 void *dmabuf; 656 int result; 657 658 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 659 if (!dmabuf) 660 return -ENOMEM; 661 662 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 663 req, REQTYPE_HOST_TO_INTERFACE, 0, 664 port_priv->bInterfaceNumber, dmabuf, bufsize, 665 USB_CTRL_SET_TIMEOUT); 666 667 kfree(dmabuf); 668 669 if (result == bufsize) { 670 result = 0; 671 } else { 672 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", 673 req, bufsize, result); 674 if (result >= 0) 675 result = -EIO; 676 } 677 678 return result; 679 } 680 681 /* 682 * Writes any 32-bit CP210X_ register identified by req. 683 */ 684 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) 685 { 686 __le32 le32_val; 687 688 le32_val = cpu_to_le32(val); 689 690 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); 691 } 692 693 #ifdef CONFIG_GPIOLIB 694 /* 695 * Writes a variable-sized vendor block of CP210X_ registers, identified by val. 696 * Data in buf must be in native USB byte order. 697 */ 698 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type, 699 u16 val, void *buf, int bufsize) 700 { 701 void *dmabuf; 702 int result; 703 704 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 705 if (!dmabuf) 706 return -ENOMEM; 707 708 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 709 CP210X_VENDOR_SPECIFIC, type, val, 710 cp210x_interface_num(serial), dmabuf, bufsize, 711 USB_CTRL_SET_TIMEOUT); 712 713 kfree(dmabuf); 714 715 if (result == bufsize) { 716 result = 0; 717 } else { 718 dev_err(&serial->interface->dev, 719 "failed to set vendor val 0x%04x size %d: %d\n", val, 720 bufsize, result); 721 if (result >= 0) 722 result = -EIO; 723 } 724 725 return result; 726 } 727 #endif 728 729 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 730 { 731 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 732 int result; 733 734 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 735 if (result) { 736 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 737 return result; 738 } 739 740 if (tty) 741 cp210x_set_termios(tty, port, NULL); 742 743 result = usb_serial_generic_open(tty, port); 744 if (result) 745 goto err_disable; 746 747 return 0; 748 749 err_disable: 750 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 751 port_priv->event_mode = false; 752 753 return result; 754 } 755 756 static void cp210x_close(struct usb_serial_port *port) 757 { 758 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 759 760 usb_serial_generic_close(port); 761 762 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 763 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 764 765 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 766 767 /* Disabling the interface disables event-insertion mode. */ 768 port_priv->event_mode = false; 769 } 770 771 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag) 772 { 773 if (lsr & CP210X_LSR_BREAK) { 774 port->icount.brk++; 775 *flag = TTY_BREAK; 776 } else if (lsr & CP210X_LSR_PARITY) { 777 port->icount.parity++; 778 *flag = TTY_PARITY; 779 } else if (lsr & CP210X_LSR_FRAME) { 780 port->icount.frame++; 781 *flag = TTY_FRAME; 782 } 783 784 if (lsr & CP210X_LSR_OVERRUN) { 785 port->icount.overrun++; 786 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); 787 } 788 } 789 790 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag) 791 { 792 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 793 794 switch (port_priv->event_state) { 795 case ES_DATA: 796 if (*ch == CP210X_ESCCHAR) { 797 port_priv->event_state = ES_ESCAPE; 798 break; 799 } 800 return false; 801 case ES_ESCAPE: 802 switch (*ch) { 803 case 0: 804 dev_dbg(&port->dev, "%s - escape char\n", __func__); 805 *ch = CP210X_ESCCHAR; 806 port_priv->event_state = ES_DATA; 807 return false; 808 case 1: 809 port_priv->event_state = ES_LSR_DATA_0; 810 break; 811 case 2: 812 port_priv->event_state = ES_LSR; 813 break; 814 case 3: 815 port_priv->event_state = ES_MSR; 816 break; 817 default: 818 dev_err(&port->dev, "malformed event 0x%02x\n", *ch); 819 port_priv->event_state = ES_DATA; 820 break; 821 } 822 break; 823 case ES_LSR_DATA_0: 824 port_priv->lsr = *ch; 825 port_priv->event_state = ES_LSR_DATA_1; 826 break; 827 case ES_LSR_DATA_1: 828 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n", 829 __func__, port_priv->lsr, *ch); 830 cp210x_process_lsr(port, port_priv->lsr, flag); 831 port_priv->event_state = ES_DATA; 832 return false; 833 case ES_LSR: 834 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch); 835 port_priv->lsr = *ch; 836 cp210x_process_lsr(port, port_priv->lsr, flag); 837 port_priv->event_state = ES_DATA; 838 break; 839 case ES_MSR: 840 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch); 841 /* unimplemented */ 842 port_priv->event_state = ES_DATA; 843 break; 844 } 845 846 return true; 847 } 848 849 static void cp210x_process_read_urb(struct urb *urb) 850 { 851 struct usb_serial_port *port = urb->context; 852 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 853 unsigned char *ch = urb->transfer_buffer; 854 char flag; 855 int i; 856 857 if (!urb->actual_length) 858 return; 859 860 if (port_priv->event_mode) { 861 for (i = 0; i < urb->actual_length; i++, ch++) { 862 flag = TTY_NORMAL; 863 864 if (cp210x_process_char(port, ch, &flag)) 865 continue; 866 867 tty_insert_flip_char(&port->port, *ch, flag); 868 } 869 } else { 870 tty_insert_flip_string(&port->port, ch, urb->actual_length); 871 } 872 tty_flip_buffer_push(&port->port); 873 } 874 875 /* 876 * Read how many bytes are waiting in the TX queue. 877 */ 878 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 879 u32 *count) 880 { 881 struct usb_serial *serial = port->serial; 882 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 883 struct cp210x_comm_status *sts; 884 int result; 885 886 sts = kmalloc(sizeof(*sts), GFP_KERNEL); 887 if (!sts) 888 return -ENOMEM; 889 890 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 891 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST, 892 0, port_priv->bInterfaceNumber, sts, sizeof(*sts), 893 USB_CTRL_GET_TIMEOUT); 894 if (result == sizeof(*sts)) { 895 *count = le32_to_cpu(sts->ulAmountInOutQueue); 896 result = 0; 897 } else { 898 dev_err(&port->dev, "failed to get comm status: %d\n", result); 899 if (result >= 0) 900 result = -EIO; 901 } 902 903 kfree(sts); 904 905 return result; 906 } 907 908 static bool cp210x_tx_empty(struct usb_serial_port *port) 909 { 910 int err; 911 u32 count; 912 913 err = cp210x_get_tx_queue_byte_count(port, &count); 914 if (err) 915 return true; 916 917 return !count; 918 } 919 920 struct cp210x_rate { 921 speed_t rate; 922 speed_t high; 923 }; 924 925 static const struct cp210x_rate cp210x_an205_table1[] = { 926 { 300, 300 }, 927 { 600, 600 }, 928 { 1200, 1200 }, 929 { 1800, 1800 }, 930 { 2400, 2400 }, 931 { 4000, 4000 }, 932 { 4800, 4803 }, 933 { 7200, 7207 }, 934 { 9600, 9612 }, 935 { 14400, 14428 }, 936 { 16000, 16062 }, 937 { 19200, 19250 }, 938 { 28800, 28912 }, 939 { 38400, 38601 }, 940 { 51200, 51558 }, 941 { 56000, 56280 }, 942 { 57600, 58053 }, 943 { 64000, 64111 }, 944 { 76800, 77608 }, 945 { 115200, 117028 }, 946 { 128000, 129347 }, 947 { 153600, 156868 }, 948 { 230400, 237832 }, 949 { 250000, 254234 }, 950 { 256000, 273066 }, 951 { 460800, 491520 }, 952 { 500000, 567138 }, 953 { 576000, 670254 }, 954 { 921600, UINT_MAX } 955 }; 956 957 /* 958 * Quantises the baud rate as per AN205 Table 1 959 */ 960 static speed_t cp210x_get_an205_rate(speed_t baud) 961 { 962 int i; 963 964 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) { 965 if (baud <= cp210x_an205_table1[i].high) 966 break; 967 } 968 969 return cp210x_an205_table1[i].rate; 970 } 971 972 static speed_t cp210x_get_actual_rate(speed_t baud) 973 { 974 unsigned int prescale = 1; 975 unsigned int div; 976 977 if (baud <= 365) 978 prescale = 4; 979 980 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud); 981 baud = 48000000 / (2 * prescale * div); 982 983 return baud; 984 } 985 986 /* 987 * CP2101 supports the following baud rates: 988 * 989 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 990 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 991 * 992 * CP2102 and CP2103 support the following additional rates: 993 * 994 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 995 * 576000 996 * 997 * The device will map a requested rate to a supported one, but the result 998 * of requests for rates greater than 1053257 is undefined (see AN205). 999 * 1000 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 1001 * respectively, with an error less than 1%. The actual rates are determined 1002 * by 1003 * 1004 * div = round(freq / (2 x prescale x request)) 1005 * actual = freq / (2 x prescale x div) 1006 * 1007 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 1008 * or 1 otherwise. 1009 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 1010 * otherwise. 1011 */ 1012 static void cp210x_change_speed(struct tty_struct *tty, 1013 struct usb_serial_port *port, struct ktermios *old_termios) 1014 { 1015 struct usb_serial *serial = port->serial; 1016 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1017 u32 baud; 1018 1019 /* 1020 * This maps the requested rate to the actual rate, a valid rate on 1021 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed]. 1022 * 1023 * NOTE: B0 is not implemented. 1024 */ 1025 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed); 1026 1027 if (priv->use_actual_rate) 1028 baud = cp210x_get_actual_rate(baud); 1029 else if (baud < 1000000) 1030 baud = cp210x_get_an205_rate(baud); 1031 1032 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 1033 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { 1034 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 1035 if (old_termios) 1036 baud = old_termios->c_ospeed; 1037 else 1038 baud = 9600; 1039 } 1040 1041 tty_encode_baud_rate(tty, baud, baud); 1042 } 1043 1044 static void cp210x_enable_event_mode(struct usb_serial_port *port) 1045 { 1046 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1047 int ret; 1048 1049 if (port_priv->event_mode) 1050 return; 1051 1052 port_priv->event_state = ES_DATA; 1053 port_priv->event_mode = true; 1054 1055 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR); 1056 if (ret) { 1057 dev_err(&port->dev, "failed to enable events: %d\n", ret); 1058 port_priv->event_mode = false; 1059 } 1060 } 1061 1062 static void cp210x_disable_event_mode(struct usb_serial_port *port) 1063 { 1064 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1065 int ret; 1066 1067 if (!port_priv->event_mode) 1068 return; 1069 1070 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0); 1071 if (ret) { 1072 dev_err(&port->dev, "failed to disable events: %d\n", ret); 1073 return; 1074 } 1075 1076 port_priv->event_mode = false; 1077 } 1078 1079 static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b) 1080 { 1081 bool iflag_change; 1082 1083 iflag_change = ((a->c_iflag ^ b->c_iflag) & INPCK); 1084 1085 return tty_termios_hw_change(a, b) || iflag_change; 1086 } 1087 1088 static void cp210x_set_flow_control(struct tty_struct *tty, 1089 struct usb_serial_port *port, struct ktermios *old_termios) 1090 { 1091 struct cp210x_flow_ctl flow_ctl; 1092 u32 flow_repl; 1093 u32 ctl_hs; 1094 int ret; 1095 1096 if (old_termios && C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS)) 1097 return; 1098 1099 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1100 sizeof(flow_ctl)); 1101 if (ret) 1102 return; 1103 1104 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1105 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1106 1107 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE; 1108 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE; 1109 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY; 1110 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1111 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE); 1112 1113 if (C_CRTSCTS(tty)) { 1114 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE; 1115 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1116 flow_repl |= CP210X_SERIAL_RTS_SHIFT(CP210X_SERIAL_RTS_FLOW_CTL); 1117 } else { 1118 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE; 1119 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1120 flow_repl |= CP210X_SERIAL_RTS_SHIFT(CP210X_SERIAL_RTS_ACTIVE); 1121 } 1122 1123 dev_dbg(&port->dev, "%s - ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n", 1124 __func__, ctl_hs, flow_repl); 1125 1126 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1127 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1128 1129 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1130 sizeof(flow_ctl)); 1131 } 1132 1133 static void cp210x_set_termios(struct tty_struct *tty, 1134 struct usb_serial_port *port, struct ktermios *old_termios) 1135 { 1136 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1137 u16 bits; 1138 int ret; 1139 1140 if (old_termios && !cp210x_termios_change(&tty->termios, old_termios)) 1141 return; 1142 1143 if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed) 1144 cp210x_change_speed(tty, port, old_termios); 1145 1146 /* CP2101 only supports CS8, 1 stop bit and non-stick parity. */ 1147 if (priv->partnum == CP210X_PARTNUM_CP2101) { 1148 tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR); 1149 tty->termios.c_cflag |= CS8; 1150 } 1151 1152 bits = 0; 1153 1154 switch (C_CSIZE(tty)) { 1155 case CS5: 1156 bits |= BITS_DATA_5; 1157 break; 1158 case CS6: 1159 bits |= BITS_DATA_6; 1160 break; 1161 case CS7: 1162 bits |= BITS_DATA_7; 1163 break; 1164 case CS8: 1165 default: 1166 bits |= BITS_DATA_8; 1167 break; 1168 } 1169 1170 if (C_PARENB(tty)) { 1171 if (C_CMSPAR(tty)) { 1172 if (C_PARODD(tty)) 1173 bits |= BITS_PARITY_MARK; 1174 else 1175 bits |= BITS_PARITY_SPACE; 1176 } else { 1177 if (C_PARODD(tty)) 1178 bits |= BITS_PARITY_ODD; 1179 else 1180 bits |= BITS_PARITY_EVEN; 1181 } 1182 } 1183 1184 if (C_CSTOPB(tty)) 1185 bits |= BITS_STOP_2; 1186 else 1187 bits |= BITS_STOP_1; 1188 1189 ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1190 if (ret) 1191 dev_err(&port->dev, "failed to set line control: %d\n", ret); 1192 1193 cp210x_set_flow_control(tty, port, old_termios); 1194 1195 /* 1196 * Enable event-insertion mode only if input parity checking is 1197 * enabled for now. 1198 */ 1199 if (I_INPCK(tty)) 1200 cp210x_enable_event_mode(port); 1201 else 1202 cp210x_disable_event_mode(port); 1203 } 1204 1205 static int cp210x_tiocmset(struct tty_struct *tty, 1206 unsigned int set, unsigned int clear) 1207 { 1208 struct usb_serial_port *port = tty->driver_data; 1209 return cp210x_tiocmset_port(port, set, clear); 1210 } 1211 1212 static int cp210x_tiocmset_port(struct usb_serial_port *port, 1213 unsigned int set, unsigned int clear) 1214 { 1215 u16 control = 0; 1216 1217 if (set & TIOCM_RTS) { 1218 control |= CONTROL_RTS; 1219 control |= CONTROL_WRITE_RTS; 1220 } 1221 if (set & TIOCM_DTR) { 1222 control |= CONTROL_DTR; 1223 control |= CONTROL_WRITE_DTR; 1224 } 1225 if (clear & TIOCM_RTS) { 1226 control &= ~CONTROL_RTS; 1227 control |= CONTROL_WRITE_RTS; 1228 } 1229 if (clear & TIOCM_DTR) { 1230 control &= ~CONTROL_DTR; 1231 control |= CONTROL_WRITE_DTR; 1232 } 1233 1234 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control); 1235 1236 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1237 } 1238 1239 static void cp210x_dtr_rts(struct usb_serial_port *port, int on) 1240 { 1241 if (on) 1242 cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0); 1243 else 1244 cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS); 1245 } 1246 1247 static int cp210x_tiocmget(struct tty_struct *tty) 1248 { 1249 struct usb_serial_port *port = tty->driver_data; 1250 u8 control; 1251 int result; 1252 1253 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1254 if (result) 1255 return result; 1256 1257 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1258 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1259 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1260 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1261 |((control & CONTROL_RING)? TIOCM_RI : 0) 1262 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1263 1264 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control); 1265 1266 return result; 1267 } 1268 1269 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 1270 { 1271 struct usb_serial_port *port = tty->driver_data; 1272 u16 state; 1273 1274 if (break_state == 0) 1275 state = BREAK_OFF; 1276 else 1277 state = BREAK_ON; 1278 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1279 state == BREAK_OFF ? "off" : "on"); 1280 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1281 } 1282 1283 #ifdef CONFIG_GPIOLIB 1284 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset) 1285 { 1286 struct usb_serial *serial = gpiochip_get_data(gc); 1287 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1288 1289 if (priv->gpio_altfunc & BIT(offset)) 1290 return -ENODEV; 1291 1292 return 0; 1293 } 1294 1295 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio) 1296 { 1297 struct usb_serial *serial = gpiochip_get_data(gc); 1298 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1299 u8 req_type = REQTYPE_DEVICE_TO_HOST; 1300 int result; 1301 u8 buf; 1302 1303 if (priv->partnum == CP210X_PARTNUM_CP2105) 1304 req_type = REQTYPE_INTERFACE_TO_HOST; 1305 1306 result = usb_autopm_get_interface(serial->interface); 1307 if (result) 1308 return result; 1309 1310 result = cp210x_read_vendor_block(serial, req_type, 1311 CP210X_READ_LATCH, &buf, sizeof(buf)); 1312 usb_autopm_put_interface(serial->interface); 1313 if (result < 0) 1314 return result; 1315 1316 return !!(buf & BIT(gpio)); 1317 } 1318 1319 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value) 1320 { 1321 struct usb_serial *serial = gpiochip_get_data(gc); 1322 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1323 struct cp210x_gpio_write buf; 1324 int result; 1325 1326 if (value == 1) 1327 buf.state = BIT(gpio); 1328 else 1329 buf.state = 0; 1330 1331 buf.mask = BIT(gpio); 1332 1333 result = usb_autopm_get_interface(serial->interface); 1334 if (result) 1335 goto out; 1336 1337 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1338 result = cp210x_write_vendor_block(serial, 1339 REQTYPE_HOST_TO_INTERFACE, 1340 CP210X_WRITE_LATCH, &buf, 1341 sizeof(buf)); 1342 } else { 1343 u16 wIndex = buf.state << 8 | buf.mask; 1344 1345 result = usb_control_msg(serial->dev, 1346 usb_sndctrlpipe(serial->dev, 0), 1347 CP210X_VENDOR_SPECIFIC, 1348 REQTYPE_HOST_TO_DEVICE, 1349 CP210X_WRITE_LATCH, 1350 wIndex, 1351 NULL, 0, USB_CTRL_SET_TIMEOUT); 1352 } 1353 1354 usb_autopm_put_interface(serial->interface); 1355 out: 1356 if (result < 0) { 1357 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n", 1358 result); 1359 } 1360 } 1361 1362 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio) 1363 { 1364 struct usb_serial *serial = gpiochip_get_data(gc); 1365 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1366 1367 return priv->gpio_input & BIT(gpio); 1368 } 1369 1370 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio) 1371 { 1372 struct usb_serial *serial = gpiochip_get_data(gc); 1373 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1374 1375 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1376 /* hardware does not support an input mode */ 1377 return -ENOTSUPP; 1378 } 1379 1380 /* push-pull pins cannot be changed to be inputs */ 1381 if (priv->gpio_pushpull & BIT(gpio)) 1382 return -EINVAL; 1383 1384 /* make sure to release pin if it is being driven low */ 1385 cp210x_gpio_set(gc, gpio, 1); 1386 1387 priv->gpio_input |= BIT(gpio); 1388 1389 return 0; 1390 } 1391 1392 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio, 1393 int value) 1394 { 1395 struct usb_serial *serial = gpiochip_get_data(gc); 1396 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1397 1398 priv->gpio_input &= ~BIT(gpio); 1399 cp210x_gpio_set(gc, gpio, value); 1400 1401 return 0; 1402 } 1403 1404 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio, 1405 unsigned long config) 1406 { 1407 struct usb_serial *serial = gpiochip_get_data(gc); 1408 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1409 enum pin_config_param param = pinconf_to_config_param(config); 1410 1411 /* Succeed only if in correct mode (this can't be set at runtime) */ 1412 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) && 1413 (priv->gpio_pushpull & BIT(gpio))) 1414 return 0; 1415 1416 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) && 1417 !(priv->gpio_pushpull & BIT(gpio))) 1418 return 0; 1419 1420 return -ENOTSUPP; 1421 } 1422 1423 /* 1424 * This function is for configuring GPIO using shared pins, where other signals 1425 * are made unavailable by configuring the use of GPIO. This is believed to be 1426 * only applicable to the cp2105 at this point, the other devices supported by 1427 * this driver that provide GPIO do so in a way that does not impact other 1428 * signals and are thus expected to have very different initialisation. 1429 */ 1430 static int cp2105_gpioconf_init(struct usb_serial *serial) 1431 { 1432 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1433 struct cp210x_pin_mode mode; 1434 struct cp210x_dual_port_config config; 1435 u8 intf_num = cp210x_interface_num(serial); 1436 u8 iface_config; 1437 int result; 1438 1439 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1440 CP210X_GET_DEVICEMODE, &mode, 1441 sizeof(mode)); 1442 if (result < 0) 1443 return result; 1444 1445 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1446 CP210X_GET_PORTCONFIG, &config, 1447 sizeof(config)); 1448 if (result < 0) 1449 return result; 1450 1451 /* 2 banks of GPIO - One for the pins taken from each serial port */ 1452 if (intf_num == 0) { 1453 if (mode.eci == CP210X_PIN_MODE_MODEM) { 1454 /* mark all GPIOs of this interface as reserved */ 1455 priv->gpio_altfunc = 0xff; 1456 return 0; 1457 } 1458 1459 iface_config = config.eci_cfg; 1460 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1461 CP210X_ECI_GPIO_MODE_MASK) >> 1462 CP210X_ECI_GPIO_MODE_OFFSET); 1463 priv->gc.ngpio = 2; 1464 } else if (intf_num == 1) { 1465 if (mode.sci == CP210X_PIN_MODE_MODEM) { 1466 /* mark all GPIOs of this interface as reserved */ 1467 priv->gpio_altfunc = 0xff; 1468 return 0; 1469 } 1470 1471 iface_config = config.sci_cfg; 1472 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1473 CP210X_SCI_GPIO_MODE_MASK) >> 1474 CP210X_SCI_GPIO_MODE_OFFSET); 1475 priv->gc.ngpio = 3; 1476 } else { 1477 return -ENODEV; 1478 } 1479 1480 /* mark all pins which are not in GPIO mode */ 1481 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */ 1482 priv->gpio_altfunc |= BIT(0); 1483 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */ 1484 CP2105_GPIO1_RS485_MODE)) 1485 priv->gpio_altfunc |= BIT(1); 1486 1487 /* driver implementation for CP2105 only supports outputs */ 1488 priv->gpio_input = 0; 1489 1490 return 0; 1491 } 1492 1493 static int cp2104_gpioconf_init(struct usb_serial *serial) 1494 { 1495 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1496 struct cp210x_single_port_config config; 1497 u8 iface_config; 1498 u8 gpio_latch; 1499 int result; 1500 u8 i; 1501 1502 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1503 CP210X_GET_PORTCONFIG, &config, 1504 sizeof(config)); 1505 if (result < 0) 1506 return result; 1507 1508 priv->gc.ngpio = 4; 1509 1510 iface_config = config.device_cfg; 1511 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1512 CP210X_GPIO_MODE_MASK) >> 1513 CP210X_GPIO_MODE_OFFSET); 1514 gpio_latch = (u8)((le16_to_cpu(config.reset_state) & 1515 CP210X_GPIO_MODE_MASK) >> 1516 CP210X_GPIO_MODE_OFFSET); 1517 1518 /* mark all pins which are not in GPIO mode */ 1519 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */ 1520 priv->gpio_altfunc |= BIT(0); 1521 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */ 1522 priv->gpio_altfunc |= BIT(1); 1523 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */ 1524 priv->gpio_altfunc |= BIT(2); 1525 1526 /* 1527 * Like CP2102N, CP2104 has also no strict input and output pin 1528 * modes. 1529 * Do the same input mode emulation as CP2102N. 1530 */ 1531 for (i = 0; i < priv->gc.ngpio; ++i) { 1532 /* 1533 * Set direction to "input" iff pin is open-drain and reset 1534 * value is 1. 1535 */ 1536 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1537 priv->gpio_input |= BIT(i); 1538 } 1539 1540 return 0; 1541 } 1542 1543 static int cp2102n_gpioconf_init(struct usb_serial *serial) 1544 { 1545 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1546 const u16 config_size = 0x02a6; 1547 u8 gpio_rst_latch; 1548 u8 config_version; 1549 u8 gpio_pushpull; 1550 u8 *config_buf; 1551 u8 gpio_latch; 1552 u8 gpio_ctrl; 1553 int result; 1554 u8 i; 1555 1556 /* 1557 * Retrieve device configuration from the device. 1558 * The array received contains all customization settings done at the 1559 * factory/manufacturer. Format of the array is documented at the 1560 * time of writing at: 1561 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa 1562 */ 1563 config_buf = kmalloc(config_size, GFP_KERNEL); 1564 if (!config_buf) 1565 return -ENOMEM; 1566 1567 result = cp210x_read_vendor_block(serial, 1568 REQTYPE_DEVICE_TO_HOST, 1569 CP210X_READ_2NCONFIG, 1570 config_buf, 1571 config_size); 1572 if (result < 0) { 1573 kfree(config_buf); 1574 return result; 1575 } 1576 1577 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX]; 1578 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX]; 1579 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX]; 1580 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX]; 1581 1582 kfree(config_buf); 1583 1584 /* Make sure this is a config format we understand. */ 1585 if (config_version != 0x01) 1586 return -ENOTSUPP; 1587 1588 priv->gc.ngpio = 4; 1589 1590 /* 1591 * Get default pin states after reset. Needed so we can determine 1592 * the direction of an open-drain pin. 1593 */ 1594 gpio_latch = (gpio_rst_latch >> 3) & 0x0f; 1595 1596 /* 0 indicates open-drain mode, 1 is push-pull */ 1597 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f; 1598 1599 /* 0 indicates GPIO mode, 1 is alternate function */ 1600 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f; 1601 1602 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) { 1603 /* 1604 * For the QFN28 package, GPIO4-6 are controlled by 1605 * the low three bits of the mode/latch fields. 1606 * Contrary to the document linked above, the bits for 1607 * the SUSPEND pins are elsewhere. No alternate 1608 * function is available for these pins. 1609 */ 1610 priv->gc.ngpio = 7; 1611 gpio_latch |= (gpio_rst_latch & 7) << 4; 1612 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4; 1613 } 1614 1615 /* 1616 * The CP2102N does not strictly has input and output pin modes, 1617 * it only knows open-drain and push-pull modes which is set at 1618 * factory. An open-drain pin can function both as an 1619 * input or an output. We emulate input mode for open-drain pins 1620 * by making sure they are not driven low, and we do not allow 1621 * push-pull pins to be set as an input. 1622 */ 1623 for (i = 0; i < priv->gc.ngpio; ++i) { 1624 /* 1625 * Set direction to "input" iff pin is open-drain and reset 1626 * value is 1. 1627 */ 1628 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1629 priv->gpio_input |= BIT(i); 1630 } 1631 1632 return 0; 1633 } 1634 1635 static int cp210x_gpio_init(struct usb_serial *serial) 1636 { 1637 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1638 int result; 1639 1640 switch (priv->partnum) { 1641 case CP210X_PARTNUM_CP2104: 1642 result = cp2104_gpioconf_init(serial); 1643 break; 1644 case CP210X_PARTNUM_CP2105: 1645 result = cp2105_gpioconf_init(serial); 1646 break; 1647 case CP210X_PARTNUM_CP2102N_QFN28: 1648 case CP210X_PARTNUM_CP2102N_QFN24: 1649 case CP210X_PARTNUM_CP2102N_QFN20: 1650 result = cp2102n_gpioconf_init(serial); 1651 break; 1652 default: 1653 return 0; 1654 } 1655 1656 if (result < 0) 1657 return result; 1658 1659 priv->gc.label = "cp210x"; 1660 priv->gc.request = cp210x_gpio_request; 1661 priv->gc.get_direction = cp210x_gpio_direction_get; 1662 priv->gc.direction_input = cp210x_gpio_direction_input; 1663 priv->gc.direction_output = cp210x_gpio_direction_output; 1664 priv->gc.get = cp210x_gpio_get; 1665 priv->gc.set = cp210x_gpio_set; 1666 priv->gc.set_config = cp210x_gpio_set_config; 1667 priv->gc.owner = THIS_MODULE; 1668 priv->gc.parent = &serial->interface->dev; 1669 priv->gc.base = -1; 1670 priv->gc.can_sleep = true; 1671 1672 result = gpiochip_add_data(&priv->gc, serial); 1673 if (!result) 1674 priv->gpio_registered = true; 1675 1676 return result; 1677 } 1678 1679 static void cp210x_gpio_remove(struct usb_serial *serial) 1680 { 1681 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1682 1683 if (priv->gpio_registered) { 1684 gpiochip_remove(&priv->gc); 1685 priv->gpio_registered = false; 1686 } 1687 } 1688 1689 #else 1690 1691 static int cp210x_gpio_init(struct usb_serial *serial) 1692 { 1693 return 0; 1694 } 1695 1696 static void cp210x_gpio_remove(struct usb_serial *serial) 1697 { 1698 /* Nothing to do */ 1699 } 1700 1701 #endif 1702 1703 static int cp210x_port_probe(struct usb_serial_port *port) 1704 { 1705 struct usb_serial *serial = port->serial; 1706 struct cp210x_port_private *port_priv; 1707 1708 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 1709 if (!port_priv) 1710 return -ENOMEM; 1711 1712 port_priv->bInterfaceNumber = cp210x_interface_num(serial); 1713 1714 usb_set_serial_port_data(port, port_priv); 1715 1716 return 0; 1717 } 1718 1719 static int cp210x_port_remove(struct usb_serial_port *port) 1720 { 1721 struct cp210x_port_private *port_priv; 1722 1723 port_priv = usb_get_serial_port_data(port); 1724 kfree(port_priv); 1725 1726 return 0; 1727 } 1728 1729 static void cp210x_init_max_speed(struct usb_serial *serial) 1730 { 1731 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1732 bool use_actual_rate = false; 1733 speed_t min = 300; 1734 speed_t max; 1735 1736 switch (priv->partnum) { 1737 case CP210X_PARTNUM_CP2101: 1738 max = 921600; 1739 break; 1740 case CP210X_PARTNUM_CP2102: 1741 case CP210X_PARTNUM_CP2103: 1742 max = 1000000; 1743 break; 1744 case CP210X_PARTNUM_CP2104: 1745 use_actual_rate = true; 1746 max = 2000000; 1747 break; 1748 case CP210X_PARTNUM_CP2108: 1749 max = 2000000; 1750 break; 1751 case CP210X_PARTNUM_CP2105: 1752 if (cp210x_interface_num(serial) == 0) { 1753 use_actual_rate = true; 1754 max = 2000000; /* ECI */ 1755 } else { 1756 min = 2400; 1757 max = 921600; /* SCI */ 1758 } 1759 break; 1760 case CP210X_PARTNUM_CP2102N_QFN28: 1761 case CP210X_PARTNUM_CP2102N_QFN24: 1762 case CP210X_PARTNUM_CP2102N_QFN20: 1763 use_actual_rate = true; 1764 max = 3000000; 1765 break; 1766 default: 1767 max = 2000000; 1768 break; 1769 } 1770 1771 priv->min_speed = min; 1772 priv->max_speed = max; 1773 priv->use_actual_rate = use_actual_rate; 1774 } 1775 1776 static int cp210x_attach(struct usb_serial *serial) 1777 { 1778 int result; 1779 struct cp210x_serial_private *priv; 1780 1781 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1782 if (!priv) 1783 return -ENOMEM; 1784 1785 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1786 CP210X_GET_PARTNUM, &priv->partnum, 1787 sizeof(priv->partnum)); 1788 if (result < 0) { 1789 dev_warn(&serial->interface->dev, 1790 "querying part number failed\n"); 1791 priv->partnum = CP210X_PARTNUM_UNKNOWN; 1792 } 1793 1794 usb_set_serial_data(serial, priv); 1795 1796 cp210x_init_max_speed(serial); 1797 1798 result = cp210x_gpio_init(serial); 1799 if (result < 0) { 1800 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n", 1801 result); 1802 } 1803 1804 return 0; 1805 } 1806 1807 static void cp210x_disconnect(struct usb_serial *serial) 1808 { 1809 cp210x_gpio_remove(serial); 1810 } 1811 1812 static void cp210x_release(struct usb_serial *serial) 1813 { 1814 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1815 1816 cp210x_gpio_remove(serial); 1817 1818 kfree(priv); 1819 } 1820 1821 module_usb_serial_driver(serial_drivers, id_table); 1822 1823 MODULE_DESCRIPTION(DRIVER_DESC); 1824 MODULE_LICENSE("GPL v2"); 1825