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(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, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */ 149 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */ 150 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */ 151 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */ 152 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */ 153 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */ 154 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */ 155 { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */ 156 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */ 157 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */ 158 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */ 159 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 160 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 161 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */ 162 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 163 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 164 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */ 165 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */ 166 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 167 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 168 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 169 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 170 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 171 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 172 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */ 173 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */ 174 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 175 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 176 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */ 177 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */ 178 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */ 179 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 180 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */ 181 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */ 182 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */ 183 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */ 184 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */ 185 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */ 186 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 187 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ 188 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ 189 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ 190 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ 191 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ 192 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ 193 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 194 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 195 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 196 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */ 197 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */ 198 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */ 199 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */ 200 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */ 201 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */ 202 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */ 203 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */ 204 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */ 205 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */ 206 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */ 207 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */ 208 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 209 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */ 210 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 211 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 212 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 213 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 214 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 215 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 216 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 217 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 218 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 219 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 220 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 221 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 222 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 223 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 224 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 225 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 226 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 227 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 228 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 229 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 230 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 231 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */ 232 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 233 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 234 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 235 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */ 236 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 237 { } /* Terminating Entry */ 238 }; 239 240 MODULE_DEVICE_TABLE(usb, id_table); 241 242 struct cp210x_serial_private { 243 #ifdef CONFIG_GPIOLIB 244 struct gpio_chip gc; 245 bool gpio_registered; 246 u8 gpio_pushpull; 247 u8 gpio_altfunc; 248 u8 gpio_input; 249 #endif 250 u8 partnum; 251 speed_t min_speed; 252 speed_t max_speed; 253 bool use_actual_rate; 254 }; 255 256 enum cp210x_event_state { 257 ES_DATA, 258 ES_ESCAPE, 259 ES_LSR, 260 ES_LSR_DATA_0, 261 ES_LSR_DATA_1, 262 ES_MSR 263 }; 264 265 struct cp210x_port_private { 266 u8 bInterfaceNumber; 267 bool event_mode; 268 enum cp210x_event_state event_state; 269 u8 lsr; 270 }; 271 272 static struct usb_serial_driver cp210x_device = { 273 .driver = { 274 .owner = THIS_MODULE, 275 .name = "cp210x", 276 }, 277 .id_table = id_table, 278 .num_ports = 1, 279 .bulk_in_size = 256, 280 .bulk_out_size = 256, 281 .open = cp210x_open, 282 .close = cp210x_close, 283 .break_ctl = cp210x_break_ctl, 284 .set_termios = cp210x_set_termios, 285 .tx_empty = cp210x_tx_empty, 286 .throttle = usb_serial_generic_throttle, 287 .unthrottle = usb_serial_generic_unthrottle, 288 .tiocmget = cp210x_tiocmget, 289 .tiocmset = cp210x_tiocmset, 290 .get_icount = usb_serial_generic_get_icount, 291 .attach = cp210x_attach, 292 .disconnect = cp210x_disconnect, 293 .release = cp210x_release, 294 .port_probe = cp210x_port_probe, 295 .port_remove = cp210x_port_remove, 296 .dtr_rts = cp210x_dtr_rts, 297 .process_read_urb = cp210x_process_read_urb, 298 }; 299 300 static struct usb_serial_driver * const serial_drivers[] = { 301 &cp210x_device, NULL 302 }; 303 304 /* Config request types */ 305 #define REQTYPE_HOST_TO_INTERFACE 0x41 306 #define REQTYPE_INTERFACE_TO_HOST 0xc1 307 #define REQTYPE_HOST_TO_DEVICE 0x40 308 #define REQTYPE_DEVICE_TO_HOST 0xc0 309 310 /* Config request codes */ 311 #define CP210X_IFC_ENABLE 0x00 312 #define CP210X_SET_BAUDDIV 0x01 313 #define CP210X_GET_BAUDDIV 0x02 314 #define CP210X_SET_LINE_CTL 0x03 315 #define CP210X_GET_LINE_CTL 0x04 316 #define CP210X_SET_BREAK 0x05 317 #define CP210X_IMM_CHAR 0x06 318 #define CP210X_SET_MHS 0x07 319 #define CP210X_GET_MDMSTS 0x08 320 #define CP210X_SET_XON 0x09 321 #define CP210X_SET_XOFF 0x0A 322 #define CP210X_SET_EVENTMASK 0x0B 323 #define CP210X_GET_EVENTMASK 0x0C 324 #define CP210X_SET_CHAR 0x0D 325 #define CP210X_GET_CHARS 0x0E 326 #define CP210X_GET_PROPS 0x0F 327 #define CP210X_GET_COMM_STATUS 0x10 328 #define CP210X_RESET 0x11 329 #define CP210X_PURGE 0x12 330 #define CP210X_SET_FLOW 0x13 331 #define CP210X_GET_FLOW 0x14 332 #define CP210X_EMBED_EVENTS 0x15 333 #define CP210X_GET_EVENTSTATE 0x16 334 #define CP210X_SET_CHARS 0x19 335 #define CP210X_GET_BAUDRATE 0x1D 336 #define CP210X_SET_BAUDRATE 0x1E 337 #define CP210X_VENDOR_SPECIFIC 0xFF 338 339 /* CP210X_IFC_ENABLE */ 340 #define UART_ENABLE 0x0001 341 #define UART_DISABLE 0x0000 342 343 /* CP210X_(SET|GET)_BAUDDIV */ 344 #define BAUD_RATE_GEN_FREQ 0x384000 345 346 /* CP210X_(SET|GET)_LINE_CTL */ 347 #define BITS_DATA_MASK 0X0f00 348 #define BITS_DATA_5 0X0500 349 #define BITS_DATA_6 0X0600 350 #define BITS_DATA_7 0X0700 351 #define BITS_DATA_8 0X0800 352 #define BITS_DATA_9 0X0900 353 354 #define BITS_PARITY_MASK 0x00f0 355 #define BITS_PARITY_NONE 0x0000 356 #define BITS_PARITY_ODD 0x0010 357 #define BITS_PARITY_EVEN 0x0020 358 #define BITS_PARITY_MARK 0x0030 359 #define BITS_PARITY_SPACE 0x0040 360 361 #define BITS_STOP_MASK 0x000f 362 #define BITS_STOP_1 0x0000 363 #define BITS_STOP_1_5 0x0001 364 #define BITS_STOP_2 0x0002 365 366 /* CP210X_SET_BREAK */ 367 #define BREAK_ON 0x0001 368 #define BREAK_OFF 0x0000 369 370 /* CP210X_(SET_MHS|GET_MDMSTS) */ 371 #define CONTROL_DTR 0x0001 372 #define CONTROL_RTS 0x0002 373 #define CONTROL_CTS 0x0010 374 #define CONTROL_DSR 0x0020 375 #define CONTROL_RING 0x0040 376 #define CONTROL_DCD 0x0080 377 #define CONTROL_WRITE_DTR 0x0100 378 #define CONTROL_WRITE_RTS 0x0200 379 380 /* CP210X_VENDOR_SPECIFIC values */ 381 #define CP210X_READ_2NCONFIG 0x000E 382 #define CP210X_READ_LATCH 0x00C2 383 #define CP210X_GET_PARTNUM 0x370B 384 #define CP210X_GET_PORTCONFIG 0x370C 385 #define CP210X_GET_DEVICEMODE 0x3711 386 #define CP210X_WRITE_LATCH 0x37E1 387 388 /* Part number definitions */ 389 #define CP210X_PARTNUM_CP2101 0x01 390 #define CP210X_PARTNUM_CP2102 0x02 391 #define CP210X_PARTNUM_CP2103 0x03 392 #define CP210X_PARTNUM_CP2104 0x04 393 #define CP210X_PARTNUM_CP2105 0x05 394 #define CP210X_PARTNUM_CP2108 0x08 395 #define CP210X_PARTNUM_CP2102N_QFN28 0x20 396 #define CP210X_PARTNUM_CP2102N_QFN24 0x21 397 #define CP210X_PARTNUM_CP2102N_QFN20 0x22 398 #define CP210X_PARTNUM_UNKNOWN 0xFF 399 400 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 401 struct cp210x_comm_status { 402 __le32 ulErrors; 403 __le32 ulHoldReasons; 404 __le32 ulAmountInInQueue; 405 __le32 ulAmountInOutQueue; 406 u8 bEofReceived; 407 u8 bWaitForImmediate; 408 u8 bReserved; 409 } __packed; 410 411 /* 412 * CP210X_PURGE - 16 bits passed in wValue of USB request. 413 * SiLabs app note AN571 gives a strange description of the 4 bits: 414 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 415 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 416 */ 417 #define PURGE_ALL 0x000f 418 419 /* CP210X_EMBED_EVENTS */ 420 #define CP210X_ESCCHAR 0xec 421 422 #define CP210X_LSR_OVERRUN BIT(1) 423 #define CP210X_LSR_PARITY BIT(2) 424 #define CP210X_LSR_FRAME BIT(3) 425 #define CP210X_LSR_BREAK BIT(4) 426 427 428 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */ 429 struct cp210x_flow_ctl { 430 __le32 ulControlHandshake; 431 __le32 ulFlowReplace; 432 __le32 ulXonLimit; 433 __le32 ulXoffLimit; 434 }; 435 436 /* cp210x_flow_ctl::ulControlHandshake */ 437 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0) 438 #define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode) 439 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3) 440 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4) 441 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5) 442 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6) 443 444 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */ 445 #define CP210X_SERIAL_DTR_INACTIVE 0 446 #define CP210X_SERIAL_DTR_ACTIVE 1 447 #define CP210X_SERIAL_DTR_FLOW_CTL 2 448 449 /* cp210x_flow_ctl::ulFlowReplace */ 450 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0) 451 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1) 452 #define CP210X_SERIAL_ERROR_CHAR BIT(2) 453 #define CP210X_SERIAL_NULL_STRIPPING BIT(3) 454 #define CP210X_SERIAL_BREAK_CHAR BIT(4) 455 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6) 456 #define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6) 457 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31) 458 459 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */ 460 #define CP210X_SERIAL_RTS_INACTIVE 0 461 #define CP210X_SERIAL_RTS_ACTIVE 1 462 #define CP210X_SERIAL_RTS_FLOW_CTL 2 463 464 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */ 465 struct cp210x_pin_mode { 466 u8 eci; 467 u8 sci; 468 }; 469 470 #define CP210X_PIN_MODE_MODEM 0 471 #define CP210X_PIN_MODE_GPIO BIT(0) 472 473 /* 474 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes 475 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes. 476 */ 477 struct cp210x_dual_port_config { 478 __le16 gpio_mode; 479 u8 __pad0[2]; 480 __le16 reset_state; 481 u8 __pad1[4]; 482 __le16 suspend_state; 483 u8 sci_cfg; 484 u8 eci_cfg; 485 u8 device_cfg; 486 } __packed; 487 488 /* 489 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes 490 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes. 491 */ 492 struct cp210x_single_port_config { 493 __le16 gpio_mode; 494 u8 __pad0[2]; 495 __le16 reset_state; 496 u8 __pad1[4]; 497 __le16 suspend_state; 498 u8 device_cfg; 499 } __packed; 500 501 /* GPIO modes */ 502 #define CP210X_SCI_GPIO_MODE_OFFSET 9 503 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9) 504 505 #define CP210X_ECI_GPIO_MODE_OFFSET 2 506 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2) 507 508 #define CP210X_GPIO_MODE_OFFSET 8 509 #define CP210X_GPIO_MODE_MASK GENMASK(11, 8) 510 511 /* CP2105 port configuration values */ 512 #define CP2105_GPIO0_TXLED_MODE BIT(0) 513 #define CP2105_GPIO1_RXLED_MODE BIT(1) 514 #define CP2105_GPIO1_RS485_MODE BIT(2) 515 516 /* CP2104 port configuration values */ 517 #define CP2104_GPIO0_TXLED_MODE BIT(0) 518 #define CP2104_GPIO1_RXLED_MODE BIT(1) 519 #define CP2104_GPIO2_RS485_MODE BIT(2) 520 521 /* CP2102N configuration array indices */ 522 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2 523 #define CP210X_2NCONFIG_GPIO_MODE_IDX 581 524 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587 525 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600 526 527 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */ 528 struct cp210x_gpio_write { 529 u8 mask; 530 u8 state; 531 }; 532 533 /* 534 * Helper to get interface number when we only have struct usb_serial. 535 */ 536 static u8 cp210x_interface_num(struct usb_serial *serial) 537 { 538 struct usb_host_interface *cur_altsetting; 539 540 cur_altsetting = serial->interface->cur_altsetting; 541 542 return cur_altsetting->desc.bInterfaceNumber; 543 } 544 545 /* 546 * Reads a variable-sized block of CP210X_ registers, identified by req. 547 * Returns data into buf in native USB byte order. 548 */ 549 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, 550 void *buf, int bufsize) 551 { 552 struct usb_serial *serial = port->serial; 553 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 554 void *dmabuf; 555 int result; 556 557 dmabuf = kmalloc(bufsize, GFP_KERNEL); 558 if (!dmabuf) 559 return -ENOMEM; 560 561 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 562 req, REQTYPE_INTERFACE_TO_HOST, 0, 563 port_priv->bInterfaceNumber, dmabuf, bufsize, 564 USB_CTRL_SET_TIMEOUT); 565 if (result == bufsize) { 566 memcpy(buf, dmabuf, bufsize); 567 result = 0; 568 } else { 569 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", 570 req, bufsize, result); 571 if (result >= 0) 572 result = -EIO; 573 } 574 575 kfree(dmabuf); 576 577 return result; 578 } 579 580 /* 581 * Reads any 8-bit CP210X_ register identified by req. 582 */ 583 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val) 584 { 585 return cp210x_read_reg_block(port, req, val, sizeof(*val)); 586 } 587 588 /* 589 * Reads a variable-sized vendor block of CP210X_ registers, identified by val. 590 * Returns data into buf in native USB byte order. 591 */ 592 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val, 593 void *buf, int bufsize) 594 { 595 void *dmabuf; 596 int result; 597 598 dmabuf = kmalloc(bufsize, GFP_KERNEL); 599 if (!dmabuf) 600 return -ENOMEM; 601 602 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 603 CP210X_VENDOR_SPECIFIC, type, val, 604 cp210x_interface_num(serial), dmabuf, bufsize, 605 USB_CTRL_GET_TIMEOUT); 606 if (result == bufsize) { 607 memcpy(buf, dmabuf, bufsize); 608 result = 0; 609 } else { 610 dev_err(&serial->interface->dev, 611 "failed to get vendor val 0x%04x size %d: %d\n", val, 612 bufsize, result); 613 if (result >= 0) 614 result = -EIO; 615 } 616 617 kfree(dmabuf); 618 619 return result; 620 } 621 622 /* 623 * Writes any 16-bit CP210X_ register (req) whose value is passed 624 * entirely in the wValue field of the USB request. 625 */ 626 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) 627 { 628 struct usb_serial *serial = port->serial; 629 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 630 int result; 631 632 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 633 req, REQTYPE_HOST_TO_INTERFACE, val, 634 port_priv->bInterfaceNumber, NULL, 0, 635 USB_CTRL_SET_TIMEOUT); 636 if (result < 0) { 637 dev_err(&port->dev, "failed set request 0x%x status: %d\n", 638 req, result); 639 } 640 641 return result; 642 } 643 644 /* 645 * Writes a variable-sized block of CP210X_ registers, identified by req. 646 * Data in buf must be in native USB byte order. 647 */ 648 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req, 649 void *buf, int bufsize) 650 { 651 struct usb_serial *serial = port->serial; 652 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 653 void *dmabuf; 654 int result; 655 656 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 657 if (!dmabuf) 658 return -ENOMEM; 659 660 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 661 req, REQTYPE_HOST_TO_INTERFACE, 0, 662 port_priv->bInterfaceNumber, dmabuf, bufsize, 663 USB_CTRL_SET_TIMEOUT); 664 665 kfree(dmabuf); 666 667 if (result == bufsize) { 668 result = 0; 669 } else { 670 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", 671 req, bufsize, result); 672 if (result >= 0) 673 result = -EIO; 674 } 675 676 return result; 677 } 678 679 /* 680 * Writes any 32-bit CP210X_ register identified by req. 681 */ 682 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) 683 { 684 __le32 le32_val; 685 686 le32_val = cpu_to_le32(val); 687 688 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); 689 } 690 691 #ifdef CONFIG_GPIOLIB 692 /* 693 * Writes a variable-sized vendor block of CP210X_ registers, identified by val. 694 * Data in buf must be in native USB byte order. 695 */ 696 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type, 697 u16 val, void *buf, int bufsize) 698 { 699 void *dmabuf; 700 int result; 701 702 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 703 if (!dmabuf) 704 return -ENOMEM; 705 706 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 707 CP210X_VENDOR_SPECIFIC, type, val, 708 cp210x_interface_num(serial), dmabuf, bufsize, 709 USB_CTRL_SET_TIMEOUT); 710 711 kfree(dmabuf); 712 713 if (result == bufsize) { 714 result = 0; 715 } else { 716 dev_err(&serial->interface->dev, 717 "failed to set vendor val 0x%04x size %d: %d\n", val, 718 bufsize, result); 719 if (result >= 0) 720 result = -EIO; 721 } 722 723 return result; 724 } 725 #endif 726 727 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 728 { 729 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 730 int result; 731 732 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 733 if (result) { 734 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 735 return result; 736 } 737 738 if (tty) 739 cp210x_set_termios(tty, port, NULL); 740 741 result = usb_serial_generic_open(tty, port); 742 if (result) 743 goto err_disable; 744 745 return 0; 746 747 err_disable: 748 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 749 port_priv->event_mode = false; 750 751 return result; 752 } 753 754 static void cp210x_close(struct usb_serial_port *port) 755 { 756 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 757 758 usb_serial_generic_close(port); 759 760 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 761 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 762 763 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 764 765 /* Disabling the interface disables event-insertion mode. */ 766 port_priv->event_mode = false; 767 } 768 769 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag) 770 { 771 if (lsr & CP210X_LSR_BREAK) { 772 port->icount.brk++; 773 *flag = TTY_BREAK; 774 } else if (lsr & CP210X_LSR_PARITY) { 775 port->icount.parity++; 776 *flag = TTY_PARITY; 777 } else if (lsr & CP210X_LSR_FRAME) { 778 port->icount.frame++; 779 *flag = TTY_FRAME; 780 } 781 782 if (lsr & CP210X_LSR_OVERRUN) { 783 port->icount.overrun++; 784 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); 785 } 786 } 787 788 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag) 789 { 790 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 791 792 switch (port_priv->event_state) { 793 case ES_DATA: 794 if (*ch == CP210X_ESCCHAR) { 795 port_priv->event_state = ES_ESCAPE; 796 break; 797 } 798 return false; 799 case ES_ESCAPE: 800 switch (*ch) { 801 case 0: 802 dev_dbg(&port->dev, "%s - escape char\n", __func__); 803 *ch = CP210X_ESCCHAR; 804 port_priv->event_state = ES_DATA; 805 return false; 806 case 1: 807 port_priv->event_state = ES_LSR_DATA_0; 808 break; 809 case 2: 810 port_priv->event_state = ES_LSR; 811 break; 812 case 3: 813 port_priv->event_state = ES_MSR; 814 break; 815 default: 816 dev_err(&port->dev, "malformed event 0x%02x\n", *ch); 817 port_priv->event_state = ES_DATA; 818 break; 819 } 820 break; 821 case ES_LSR_DATA_0: 822 port_priv->lsr = *ch; 823 port_priv->event_state = ES_LSR_DATA_1; 824 break; 825 case ES_LSR_DATA_1: 826 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n", 827 __func__, port_priv->lsr, *ch); 828 cp210x_process_lsr(port, port_priv->lsr, flag); 829 port_priv->event_state = ES_DATA; 830 return false; 831 case ES_LSR: 832 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch); 833 port_priv->lsr = *ch; 834 cp210x_process_lsr(port, port_priv->lsr, flag); 835 port_priv->event_state = ES_DATA; 836 break; 837 case ES_MSR: 838 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch); 839 /* unimplemented */ 840 port_priv->event_state = ES_DATA; 841 break; 842 } 843 844 return true; 845 } 846 847 static void cp210x_process_read_urb(struct urb *urb) 848 { 849 struct usb_serial_port *port = urb->context; 850 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 851 unsigned char *ch = urb->transfer_buffer; 852 char flag; 853 int i; 854 855 if (!urb->actual_length) 856 return; 857 858 if (port_priv->event_mode) { 859 for (i = 0; i < urb->actual_length; i++, ch++) { 860 flag = TTY_NORMAL; 861 862 if (cp210x_process_char(port, ch, &flag)) 863 continue; 864 865 tty_insert_flip_char(&port->port, *ch, flag); 866 } 867 } else { 868 tty_insert_flip_string(&port->port, ch, urb->actual_length); 869 } 870 tty_flip_buffer_push(&port->port); 871 } 872 873 /* 874 * Read how many bytes are waiting in the TX queue. 875 */ 876 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 877 u32 *count) 878 { 879 struct usb_serial *serial = port->serial; 880 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 881 struct cp210x_comm_status *sts; 882 int result; 883 884 sts = kmalloc(sizeof(*sts), GFP_KERNEL); 885 if (!sts) 886 return -ENOMEM; 887 888 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 889 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST, 890 0, port_priv->bInterfaceNumber, sts, sizeof(*sts), 891 USB_CTRL_GET_TIMEOUT); 892 if (result == sizeof(*sts)) { 893 *count = le32_to_cpu(sts->ulAmountInOutQueue); 894 result = 0; 895 } else { 896 dev_err(&port->dev, "failed to get comm status: %d\n", result); 897 if (result >= 0) 898 result = -EIO; 899 } 900 901 kfree(sts); 902 903 return result; 904 } 905 906 static bool cp210x_tx_empty(struct usb_serial_port *port) 907 { 908 int err; 909 u32 count; 910 911 err = cp210x_get_tx_queue_byte_count(port, &count); 912 if (err) 913 return true; 914 915 return !count; 916 } 917 918 struct cp210x_rate { 919 speed_t rate; 920 speed_t high; 921 }; 922 923 static const struct cp210x_rate cp210x_an205_table1[] = { 924 { 300, 300 }, 925 { 600, 600 }, 926 { 1200, 1200 }, 927 { 1800, 1800 }, 928 { 2400, 2400 }, 929 { 4000, 4000 }, 930 { 4800, 4803 }, 931 { 7200, 7207 }, 932 { 9600, 9612 }, 933 { 14400, 14428 }, 934 { 16000, 16062 }, 935 { 19200, 19250 }, 936 { 28800, 28912 }, 937 { 38400, 38601 }, 938 { 51200, 51558 }, 939 { 56000, 56280 }, 940 { 57600, 58053 }, 941 { 64000, 64111 }, 942 { 76800, 77608 }, 943 { 115200, 117028 }, 944 { 128000, 129347 }, 945 { 153600, 156868 }, 946 { 230400, 237832 }, 947 { 250000, 254234 }, 948 { 256000, 273066 }, 949 { 460800, 491520 }, 950 { 500000, 567138 }, 951 { 576000, 670254 }, 952 { 921600, UINT_MAX } 953 }; 954 955 /* 956 * Quantises the baud rate as per AN205 Table 1 957 */ 958 static speed_t cp210x_get_an205_rate(speed_t baud) 959 { 960 int i; 961 962 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) { 963 if (baud <= cp210x_an205_table1[i].high) 964 break; 965 } 966 967 return cp210x_an205_table1[i].rate; 968 } 969 970 static speed_t cp210x_get_actual_rate(speed_t baud) 971 { 972 unsigned int prescale = 1; 973 unsigned int div; 974 975 if (baud <= 365) 976 prescale = 4; 977 978 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud); 979 baud = 48000000 / (2 * prescale * div); 980 981 return baud; 982 } 983 984 /* 985 * CP2101 supports the following baud rates: 986 * 987 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 988 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 989 * 990 * CP2102 and CP2103 support the following additional rates: 991 * 992 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 993 * 576000 994 * 995 * The device will map a requested rate to a supported one, but the result 996 * of requests for rates greater than 1053257 is undefined (see AN205). 997 * 998 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 999 * respectively, with an error less than 1%. The actual rates are determined 1000 * by 1001 * 1002 * div = round(freq / (2 x prescale x request)) 1003 * actual = freq / (2 x prescale x div) 1004 * 1005 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 1006 * or 1 otherwise. 1007 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 1008 * otherwise. 1009 */ 1010 static void cp210x_change_speed(struct tty_struct *tty, 1011 struct usb_serial_port *port, struct ktermios *old_termios) 1012 { 1013 struct usb_serial *serial = port->serial; 1014 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1015 u32 baud; 1016 1017 /* 1018 * This maps the requested rate to the actual rate, a valid rate on 1019 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed]. 1020 * 1021 * NOTE: B0 is not implemented. 1022 */ 1023 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed); 1024 1025 if (priv->use_actual_rate) 1026 baud = cp210x_get_actual_rate(baud); 1027 else if (baud < 1000000) 1028 baud = cp210x_get_an205_rate(baud); 1029 1030 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 1031 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { 1032 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 1033 if (old_termios) 1034 baud = old_termios->c_ospeed; 1035 else 1036 baud = 9600; 1037 } 1038 1039 tty_encode_baud_rate(tty, baud, baud); 1040 } 1041 1042 static void cp210x_enable_event_mode(struct usb_serial_port *port) 1043 { 1044 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1045 int ret; 1046 1047 if (port_priv->event_mode) 1048 return; 1049 1050 port_priv->event_state = ES_DATA; 1051 port_priv->event_mode = true; 1052 1053 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR); 1054 if (ret) { 1055 dev_err(&port->dev, "failed to enable events: %d\n", ret); 1056 port_priv->event_mode = false; 1057 } 1058 } 1059 1060 static void cp210x_disable_event_mode(struct usb_serial_port *port) 1061 { 1062 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1063 int ret; 1064 1065 if (!port_priv->event_mode) 1066 return; 1067 1068 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0); 1069 if (ret) { 1070 dev_err(&port->dev, "failed to disable events: %d\n", ret); 1071 return; 1072 } 1073 1074 port_priv->event_mode = false; 1075 } 1076 1077 static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b) 1078 { 1079 bool iflag_change; 1080 1081 iflag_change = ((a->c_iflag ^ b->c_iflag) & INPCK); 1082 1083 return tty_termios_hw_change(a, b) || iflag_change; 1084 } 1085 1086 static void cp210x_set_flow_control(struct tty_struct *tty, 1087 struct usb_serial_port *port, struct ktermios *old_termios) 1088 { 1089 struct cp210x_flow_ctl flow_ctl; 1090 u32 flow_repl; 1091 u32 ctl_hs; 1092 int ret; 1093 1094 if (old_termios && C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS)) 1095 return; 1096 1097 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1098 sizeof(flow_ctl)); 1099 if (ret) 1100 return; 1101 1102 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1103 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1104 1105 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE; 1106 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE; 1107 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY; 1108 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1109 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE); 1110 1111 if (C_CRTSCTS(tty)) { 1112 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE; 1113 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1114 flow_repl |= CP210X_SERIAL_RTS_SHIFT(CP210X_SERIAL_RTS_FLOW_CTL); 1115 } else { 1116 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE; 1117 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1118 flow_repl |= CP210X_SERIAL_RTS_SHIFT(CP210X_SERIAL_RTS_ACTIVE); 1119 } 1120 1121 dev_dbg(&port->dev, "%s - ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n", 1122 __func__, ctl_hs, flow_repl); 1123 1124 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1125 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1126 1127 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1128 sizeof(flow_ctl)); 1129 } 1130 1131 static void cp210x_set_termios(struct tty_struct *tty, 1132 struct usb_serial_port *port, struct ktermios *old_termios) 1133 { 1134 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1135 u16 bits; 1136 int ret; 1137 1138 if (old_termios && !cp210x_termios_change(&tty->termios, old_termios)) 1139 return; 1140 1141 if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed) 1142 cp210x_change_speed(tty, port, old_termios); 1143 1144 /* CP2101 only supports CS8, 1 stop bit and non-stick parity. */ 1145 if (priv->partnum == CP210X_PARTNUM_CP2101) { 1146 tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR); 1147 tty->termios.c_cflag |= CS8; 1148 } 1149 1150 bits = 0; 1151 1152 switch (C_CSIZE(tty)) { 1153 case CS5: 1154 bits |= BITS_DATA_5; 1155 break; 1156 case CS6: 1157 bits |= BITS_DATA_6; 1158 break; 1159 case CS7: 1160 bits |= BITS_DATA_7; 1161 break; 1162 case CS8: 1163 default: 1164 bits |= BITS_DATA_8; 1165 break; 1166 } 1167 1168 if (C_PARENB(tty)) { 1169 if (C_CMSPAR(tty)) { 1170 if (C_PARODD(tty)) 1171 bits |= BITS_PARITY_MARK; 1172 else 1173 bits |= BITS_PARITY_SPACE; 1174 } else { 1175 if (C_PARODD(tty)) 1176 bits |= BITS_PARITY_ODD; 1177 else 1178 bits |= BITS_PARITY_EVEN; 1179 } 1180 } 1181 1182 if (C_CSTOPB(tty)) 1183 bits |= BITS_STOP_2; 1184 else 1185 bits |= BITS_STOP_1; 1186 1187 ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1188 if (ret) 1189 dev_err(&port->dev, "failed to set line control: %d\n", ret); 1190 1191 cp210x_set_flow_control(tty, port, old_termios); 1192 1193 /* 1194 * Enable event-insertion mode only if input parity checking is 1195 * enabled for now. 1196 */ 1197 if (I_INPCK(tty)) 1198 cp210x_enable_event_mode(port); 1199 else 1200 cp210x_disable_event_mode(port); 1201 } 1202 1203 static int cp210x_tiocmset(struct tty_struct *tty, 1204 unsigned int set, unsigned int clear) 1205 { 1206 struct usb_serial_port *port = tty->driver_data; 1207 return cp210x_tiocmset_port(port, set, clear); 1208 } 1209 1210 static int cp210x_tiocmset_port(struct usb_serial_port *port, 1211 unsigned int set, unsigned int clear) 1212 { 1213 u16 control = 0; 1214 1215 if (set & TIOCM_RTS) { 1216 control |= CONTROL_RTS; 1217 control |= CONTROL_WRITE_RTS; 1218 } 1219 if (set & TIOCM_DTR) { 1220 control |= CONTROL_DTR; 1221 control |= CONTROL_WRITE_DTR; 1222 } 1223 if (clear & TIOCM_RTS) { 1224 control &= ~CONTROL_RTS; 1225 control |= CONTROL_WRITE_RTS; 1226 } 1227 if (clear & TIOCM_DTR) { 1228 control &= ~CONTROL_DTR; 1229 control |= CONTROL_WRITE_DTR; 1230 } 1231 1232 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control); 1233 1234 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1235 } 1236 1237 static void cp210x_dtr_rts(struct usb_serial_port *port, int on) 1238 { 1239 if (on) 1240 cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0); 1241 else 1242 cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS); 1243 } 1244 1245 static int cp210x_tiocmget(struct tty_struct *tty) 1246 { 1247 struct usb_serial_port *port = tty->driver_data; 1248 u8 control; 1249 int result; 1250 1251 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1252 if (result) 1253 return result; 1254 1255 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1256 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1257 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1258 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1259 |((control & CONTROL_RING)? TIOCM_RI : 0) 1260 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1261 1262 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control); 1263 1264 return result; 1265 } 1266 1267 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 1268 { 1269 struct usb_serial_port *port = tty->driver_data; 1270 u16 state; 1271 1272 if (break_state == 0) 1273 state = BREAK_OFF; 1274 else 1275 state = BREAK_ON; 1276 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1277 state == BREAK_OFF ? "off" : "on"); 1278 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1279 } 1280 1281 #ifdef CONFIG_GPIOLIB 1282 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset) 1283 { 1284 struct usb_serial *serial = gpiochip_get_data(gc); 1285 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1286 1287 if (priv->gpio_altfunc & BIT(offset)) 1288 return -ENODEV; 1289 1290 return 0; 1291 } 1292 1293 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio) 1294 { 1295 struct usb_serial *serial = gpiochip_get_data(gc); 1296 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1297 u8 req_type = REQTYPE_DEVICE_TO_HOST; 1298 int result; 1299 u8 buf; 1300 1301 if (priv->partnum == CP210X_PARTNUM_CP2105) 1302 req_type = REQTYPE_INTERFACE_TO_HOST; 1303 1304 result = usb_autopm_get_interface(serial->interface); 1305 if (result) 1306 return result; 1307 1308 result = cp210x_read_vendor_block(serial, req_type, 1309 CP210X_READ_LATCH, &buf, sizeof(buf)); 1310 usb_autopm_put_interface(serial->interface); 1311 if (result < 0) 1312 return result; 1313 1314 return !!(buf & BIT(gpio)); 1315 } 1316 1317 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value) 1318 { 1319 struct usb_serial *serial = gpiochip_get_data(gc); 1320 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1321 struct cp210x_gpio_write buf; 1322 int result; 1323 1324 if (value == 1) 1325 buf.state = BIT(gpio); 1326 else 1327 buf.state = 0; 1328 1329 buf.mask = BIT(gpio); 1330 1331 result = usb_autopm_get_interface(serial->interface); 1332 if (result) 1333 goto out; 1334 1335 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1336 result = cp210x_write_vendor_block(serial, 1337 REQTYPE_HOST_TO_INTERFACE, 1338 CP210X_WRITE_LATCH, &buf, 1339 sizeof(buf)); 1340 } else { 1341 u16 wIndex = buf.state << 8 | buf.mask; 1342 1343 result = usb_control_msg(serial->dev, 1344 usb_sndctrlpipe(serial->dev, 0), 1345 CP210X_VENDOR_SPECIFIC, 1346 REQTYPE_HOST_TO_DEVICE, 1347 CP210X_WRITE_LATCH, 1348 wIndex, 1349 NULL, 0, USB_CTRL_SET_TIMEOUT); 1350 } 1351 1352 usb_autopm_put_interface(serial->interface); 1353 out: 1354 if (result < 0) { 1355 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n", 1356 result); 1357 } 1358 } 1359 1360 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio) 1361 { 1362 struct usb_serial *serial = gpiochip_get_data(gc); 1363 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1364 1365 return priv->gpio_input & BIT(gpio); 1366 } 1367 1368 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio) 1369 { 1370 struct usb_serial *serial = gpiochip_get_data(gc); 1371 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1372 1373 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1374 /* hardware does not support an input mode */ 1375 return -ENOTSUPP; 1376 } 1377 1378 /* push-pull pins cannot be changed to be inputs */ 1379 if (priv->gpio_pushpull & BIT(gpio)) 1380 return -EINVAL; 1381 1382 /* make sure to release pin if it is being driven low */ 1383 cp210x_gpio_set(gc, gpio, 1); 1384 1385 priv->gpio_input |= BIT(gpio); 1386 1387 return 0; 1388 } 1389 1390 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio, 1391 int value) 1392 { 1393 struct usb_serial *serial = gpiochip_get_data(gc); 1394 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1395 1396 priv->gpio_input &= ~BIT(gpio); 1397 cp210x_gpio_set(gc, gpio, value); 1398 1399 return 0; 1400 } 1401 1402 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio, 1403 unsigned long config) 1404 { 1405 struct usb_serial *serial = gpiochip_get_data(gc); 1406 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1407 enum pin_config_param param = pinconf_to_config_param(config); 1408 1409 /* Succeed only if in correct mode (this can't be set at runtime) */ 1410 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) && 1411 (priv->gpio_pushpull & BIT(gpio))) 1412 return 0; 1413 1414 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) && 1415 !(priv->gpio_pushpull & BIT(gpio))) 1416 return 0; 1417 1418 return -ENOTSUPP; 1419 } 1420 1421 /* 1422 * This function is for configuring GPIO using shared pins, where other signals 1423 * are made unavailable by configuring the use of GPIO. This is believed to be 1424 * only applicable to the cp2105 at this point, the other devices supported by 1425 * this driver that provide GPIO do so in a way that does not impact other 1426 * signals and are thus expected to have very different initialisation. 1427 */ 1428 static int cp2105_gpioconf_init(struct usb_serial *serial) 1429 { 1430 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1431 struct cp210x_pin_mode mode; 1432 struct cp210x_dual_port_config config; 1433 u8 intf_num = cp210x_interface_num(serial); 1434 u8 iface_config; 1435 int result; 1436 1437 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1438 CP210X_GET_DEVICEMODE, &mode, 1439 sizeof(mode)); 1440 if (result < 0) 1441 return result; 1442 1443 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1444 CP210X_GET_PORTCONFIG, &config, 1445 sizeof(config)); 1446 if (result < 0) 1447 return result; 1448 1449 /* 2 banks of GPIO - One for the pins taken from each serial port */ 1450 if (intf_num == 0) { 1451 if (mode.eci == CP210X_PIN_MODE_MODEM) { 1452 /* mark all GPIOs of this interface as reserved */ 1453 priv->gpio_altfunc = 0xff; 1454 return 0; 1455 } 1456 1457 iface_config = config.eci_cfg; 1458 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1459 CP210X_ECI_GPIO_MODE_MASK) >> 1460 CP210X_ECI_GPIO_MODE_OFFSET); 1461 priv->gc.ngpio = 2; 1462 } else if (intf_num == 1) { 1463 if (mode.sci == CP210X_PIN_MODE_MODEM) { 1464 /* mark all GPIOs of this interface as reserved */ 1465 priv->gpio_altfunc = 0xff; 1466 return 0; 1467 } 1468 1469 iface_config = config.sci_cfg; 1470 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1471 CP210X_SCI_GPIO_MODE_MASK) >> 1472 CP210X_SCI_GPIO_MODE_OFFSET); 1473 priv->gc.ngpio = 3; 1474 } else { 1475 return -ENODEV; 1476 } 1477 1478 /* mark all pins which are not in GPIO mode */ 1479 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */ 1480 priv->gpio_altfunc |= BIT(0); 1481 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */ 1482 CP2105_GPIO1_RS485_MODE)) 1483 priv->gpio_altfunc |= BIT(1); 1484 1485 /* driver implementation for CP2105 only supports outputs */ 1486 priv->gpio_input = 0; 1487 1488 return 0; 1489 } 1490 1491 static int cp2104_gpioconf_init(struct usb_serial *serial) 1492 { 1493 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1494 struct cp210x_single_port_config config; 1495 u8 iface_config; 1496 u8 gpio_latch; 1497 int result; 1498 u8 i; 1499 1500 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1501 CP210X_GET_PORTCONFIG, &config, 1502 sizeof(config)); 1503 if (result < 0) 1504 return result; 1505 1506 priv->gc.ngpio = 4; 1507 1508 iface_config = config.device_cfg; 1509 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1510 CP210X_GPIO_MODE_MASK) >> 1511 CP210X_GPIO_MODE_OFFSET); 1512 gpio_latch = (u8)((le16_to_cpu(config.reset_state) & 1513 CP210X_GPIO_MODE_MASK) >> 1514 CP210X_GPIO_MODE_OFFSET); 1515 1516 /* mark all pins which are not in GPIO mode */ 1517 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */ 1518 priv->gpio_altfunc |= BIT(0); 1519 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */ 1520 priv->gpio_altfunc |= BIT(1); 1521 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */ 1522 priv->gpio_altfunc |= BIT(2); 1523 1524 /* 1525 * Like CP2102N, CP2104 has also no strict input and output pin 1526 * modes. 1527 * Do the same input mode emulation as CP2102N. 1528 */ 1529 for (i = 0; i < priv->gc.ngpio; ++i) { 1530 /* 1531 * Set direction to "input" iff pin is open-drain and reset 1532 * value is 1. 1533 */ 1534 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1535 priv->gpio_input |= BIT(i); 1536 } 1537 1538 return 0; 1539 } 1540 1541 static int cp2102n_gpioconf_init(struct usb_serial *serial) 1542 { 1543 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1544 const u16 config_size = 0x02a6; 1545 u8 gpio_rst_latch; 1546 u8 config_version; 1547 u8 gpio_pushpull; 1548 u8 *config_buf; 1549 u8 gpio_latch; 1550 u8 gpio_ctrl; 1551 int result; 1552 u8 i; 1553 1554 /* 1555 * Retrieve device configuration from the device. 1556 * The array received contains all customization settings done at the 1557 * factory/manufacturer. Format of the array is documented at the 1558 * time of writing at: 1559 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa 1560 */ 1561 config_buf = kmalloc(config_size, GFP_KERNEL); 1562 if (!config_buf) 1563 return -ENOMEM; 1564 1565 result = cp210x_read_vendor_block(serial, 1566 REQTYPE_DEVICE_TO_HOST, 1567 CP210X_READ_2NCONFIG, 1568 config_buf, 1569 config_size); 1570 if (result < 0) { 1571 kfree(config_buf); 1572 return result; 1573 } 1574 1575 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX]; 1576 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX]; 1577 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX]; 1578 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX]; 1579 1580 kfree(config_buf); 1581 1582 /* Make sure this is a config format we understand. */ 1583 if (config_version != 0x01) 1584 return -ENOTSUPP; 1585 1586 priv->gc.ngpio = 4; 1587 1588 /* 1589 * Get default pin states after reset. Needed so we can determine 1590 * the direction of an open-drain pin. 1591 */ 1592 gpio_latch = (gpio_rst_latch >> 3) & 0x0f; 1593 1594 /* 0 indicates open-drain mode, 1 is push-pull */ 1595 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f; 1596 1597 /* 0 indicates GPIO mode, 1 is alternate function */ 1598 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f; 1599 1600 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) { 1601 /* 1602 * For the QFN28 package, GPIO4-6 are controlled by 1603 * the low three bits of the mode/latch fields. 1604 * Contrary to the document linked above, the bits for 1605 * the SUSPEND pins are elsewhere. No alternate 1606 * function is available for these pins. 1607 */ 1608 priv->gc.ngpio = 7; 1609 gpio_latch |= (gpio_rst_latch & 7) << 4; 1610 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4; 1611 } 1612 1613 /* 1614 * The CP2102N does not strictly has input and output pin modes, 1615 * it only knows open-drain and push-pull modes which is set at 1616 * factory. An open-drain pin can function both as an 1617 * input or an output. We emulate input mode for open-drain pins 1618 * by making sure they are not driven low, and we do not allow 1619 * push-pull pins to be set as an input. 1620 */ 1621 for (i = 0; i < priv->gc.ngpio; ++i) { 1622 /* 1623 * Set direction to "input" iff pin is open-drain and reset 1624 * value is 1. 1625 */ 1626 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1627 priv->gpio_input |= BIT(i); 1628 } 1629 1630 return 0; 1631 } 1632 1633 static int cp210x_gpio_init(struct usb_serial *serial) 1634 { 1635 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1636 int result; 1637 1638 switch (priv->partnum) { 1639 case CP210X_PARTNUM_CP2104: 1640 result = cp2104_gpioconf_init(serial); 1641 break; 1642 case CP210X_PARTNUM_CP2105: 1643 result = cp2105_gpioconf_init(serial); 1644 break; 1645 case CP210X_PARTNUM_CP2102N_QFN28: 1646 case CP210X_PARTNUM_CP2102N_QFN24: 1647 case CP210X_PARTNUM_CP2102N_QFN20: 1648 result = cp2102n_gpioconf_init(serial); 1649 break; 1650 default: 1651 return 0; 1652 } 1653 1654 if (result < 0) 1655 return result; 1656 1657 priv->gc.label = "cp210x"; 1658 priv->gc.request = cp210x_gpio_request; 1659 priv->gc.get_direction = cp210x_gpio_direction_get; 1660 priv->gc.direction_input = cp210x_gpio_direction_input; 1661 priv->gc.direction_output = cp210x_gpio_direction_output; 1662 priv->gc.get = cp210x_gpio_get; 1663 priv->gc.set = cp210x_gpio_set; 1664 priv->gc.set_config = cp210x_gpio_set_config; 1665 priv->gc.owner = THIS_MODULE; 1666 priv->gc.parent = &serial->interface->dev; 1667 priv->gc.base = -1; 1668 priv->gc.can_sleep = true; 1669 1670 result = gpiochip_add_data(&priv->gc, serial); 1671 if (!result) 1672 priv->gpio_registered = true; 1673 1674 return result; 1675 } 1676 1677 static void cp210x_gpio_remove(struct usb_serial *serial) 1678 { 1679 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1680 1681 if (priv->gpio_registered) { 1682 gpiochip_remove(&priv->gc); 1683 priv->gpio_registered = false; 1684 } 1685 } 1686 1687 #else 1688 1689 static int cp210x_gpio_init(struct usb_serial *serial) 1690 { 1691 return 0; 1692 } 1693 1694 static void cp210x_gpio_remove(struct usb_serial *serial) 1695 { 1696 /* Nothing to do */ 1697 } 1698 1699 #endif 1700 1701 static int cp210x_port_probe(struct usb_serial_port *port) 1702 { 1703 struct usb_serial *serial = port->serial; 1704 struct cp210x_port_private *port_priv; 1705 1706 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 1707 if (!port_priv) 1708 return -ENOMEM; 1709 1710 port_priv->bInterfaceNumber = cp210x_interface_num(serial); 1711 1712 usb_set_serial_port_data(port, port_priv); 1713 1714 return 0; 1715 } 1716 1717 static int cp210x_port_remove(struct usb_serial_port *port) 1718 { 1719 struct cp210x_port_private *port_priv; 1720 1721 port_priv = usb_get_serial_port_data(port); 1722 kfree(port_priv); 1723 1724 return 0; 1725 } 1726 1727 static void cp210x_init_max_speed(struct usb_serial *serial) 1728 { 1729 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1730 bool use_actual_rate = false; 1731 speed_t min = 300; 1732 speed_t max; 1733 1734 switch (priv->partnum) { 1735 case CP210X_PARTNUM_CP2101: 1736 max = 921600; 1737 break; 1738 case CP210X_PARTNUM_CP2102: 1739 case CP210X_PARTNUM_CP2103: 1740 max = 1000000; 1741 break; 1742 case CP210X_PARTNUM_CP2104: 1743 use_actual_rate = true; 1744 max = 2000000; 1745 break; 1746 case CP210X_PARTNUM_CP2108: 1747 max = 2000000; 1748 break; 1749 case CP210X_PARTNUM_CP2105: 1750 if (cp210x_interface_num(serial) == 0) { 1751 use_actual_rate = true; 1752 max = 2000000; /* ECI */ 1753 } else { 1754 min = 2400; 1755 max = 921600; /* SCI */ 1756 } 1757 break; 1758 case CP210X_PARTNUM_CP2102N_QFN28: 1759 case CP210X_PARTNUM_CP2102N_QFN24: 1760 case CP210X_PARTNUM_CP2102N_QFN20: 1761 use_actual_rate = true; 1762 max = 3000000; 1763 break; 1764 default: 1765 max = 2000000; 1766 break; 1767 } 1768 1769 priv->min_speed = min; 1770 priv->max_speed = max; 1771 priv->use_actual_rate = use_actual_rate; 1772 } 1773 1774 static int cp210x_attach(struct usb_serial *serial) 1775 { 1776 int result; 1777 struct cp210x_serial_private *priv; 1778 1779 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1780 if (!priv) 1781 return -ENOMEM; 1782 1783 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1784 CP210X_GET_PARTNUM, &priv->partnum, 1785 sizeof(priv->partnum)); 1786 if (result < 0) { 1787 dev_warn(&serial->interface->dev, 1788 "querying part number failed\n"); 1789 priv->partnum = CP210X_PARTNUM_UNKNOWN; 1790 } 1791 1792 usb_set_serial_data(serial, priv); 1793 1794 cp210x_init_max_speed(serial); 1795 1796 result = cp210x_gpio_init(serial); 1797 if (result < 0) { 1798 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n", 1799 result); 1800 } 1801 1802 return 0; 1803 } 1804 1805 static void cp210x_disconnect(struct usb_serial *serial) 1806 { 1807 cp210x_gpio_remove(serial); 1808 } 1809 1810 static void cp210x_release(struct usb_serial *serial) 1811 { 1812 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1813 1814 cp210x_gpio_remove(serial); 1815 1816 kfree(priv); 1817 } 1818 1819 module_usb_serial_driver(serial_drivers, id_table); 1820 1821 MODULE_DESCRIPTION(DRIVER_DESC); 1822 MODULE_LICENSE("GPL v2"); 1823