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_get_termios(struct tty_struct *, struct usb_serial_port *); 35 static void cp210x_get_termios_port(struct usb_serial_port *port, 36 tcflag_t *cflagp, unsigned int *baudp); 37 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *, 38 struct ktermios *); 39 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *, 40 struct ktermios*); 41 static bool cp210x_tx_empty(struct usb_serial_port *port); 42 static int cp210x_tiocmget(struct tty_struct *); 43 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int); 44 static int cp210x_tiocmset_port(struct usb_serial_port *port, 45 unsigned int, unsigned int); 46 static void cp210x_break_ctl(struct tty_struct *, int); 47 static int cp210x_attach(struct usb_serial *); 48 static void cp210x_disconnect(struct usb_serial *); 49 static void cp210x_release(struct usb_serial *); 50 static int cp210x_port_probe(struct usb_serial_port *); 51 static int cp210x_port_remove(struct usb_serial_port *); 52 static void cp210x_dtr_rts(struct usb_serial_port *p, int on); 53 static void cp210x_process_read_urb(struct urb *urb); 54 static void cp210x_enable_event_mode(struct usb_serial_port *port); 55 static void cp210x_disable_event_mode(struct usb_serial_port *port); 56 57 static const struct usb_device_id id_table[] = { 58 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */ 59 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */ 60 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 61 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 62 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */ 63 { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */ 64 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */ 65 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */ 66 { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */ 67 { USB_DEVICE(0x0B00, 0x3070) }, /* Ingenico 3070 */ 68 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */ 69 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */ 70 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */ 71 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */ 72 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */ 73 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */ 74 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */ 75 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */ 76 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */ 77 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */ 78 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */ 79 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */ 80 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */ 81 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */ 82 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */ 83 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */ 84 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */ 85 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */ 86 { USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */ 87 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */ 88 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */ 89 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */ 90 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */ 91 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */ 92 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */ 93 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */ 94 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */ 95 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */ 96 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */ 97 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */ 98 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */ 99 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */ 100 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */ 101 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */ 102 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */ 103 { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */ 104 { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */ 105 { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */ 106 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */ 107 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */ 108 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */ 109 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */ 110 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */ 111 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */ 112 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */ 113 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */ 114 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */ 115 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */ 116 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */ 117 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */ 118 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */ 119 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */ 120 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */ 121 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */ 122 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */ 123 { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */ 124 { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */ 125 { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */ 126 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */ 127 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */ 128 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */ 129 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */ 130 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */ 131 { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */ 132 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */ 133 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ 134 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ 135 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 136 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */ 137 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ 138 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */ 139 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */ 140 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */ 141 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */ 142 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ 143 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ 144 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */ 145 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 146 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 147 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */ 148 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */ 149 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */ 150 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */ 151 { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */ 152 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */ 153 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */ 154 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */ 155 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */ 156 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */ 157 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */ 158 { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */ 159 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */ 160 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */ 161 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */ 162 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 163 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 164 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */ 165 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 166 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 167 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */ 168 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */ 169 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 170 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 171 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 172 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 173 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 174 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 175 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */ 176 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */ 177 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 178 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 179 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */ 180 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */ 181 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */ 182 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 183 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */ 184 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */ 185 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */ 186 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */ 187 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */ 188 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */ 189 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 190 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ 191 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ 192 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ 193 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ 194 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ 195 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ 196 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 197 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 198 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 199 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */ 200 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */ 201 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */ 202 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */ 203 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */ 204 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */ 205 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */ 206 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */ 207 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */ 208 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */ 209 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */ 210 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */ 211 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 212 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */ 213 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 214 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 215 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 216 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 217 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 218 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 219 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 220 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 221 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 222 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 223 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 224 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 225 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 226 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 227 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 228 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 229 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 230 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 231 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 232 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 233 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 234 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */ 235 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 236 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 237 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 238 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */ 239 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 240 { } /* Terminating Entry */ 241 }; 242 243 MODULE_DEVICE_TABLE(usb, id_table); 244 245 struct cp210x_serial_private { 246 #ifdef CONFIG_GPIOLIB 247 struct gpio_chip gc; 248 bool gpio_registered; 249 u8 gpio_pushpull; 250 u8 gpio_altfunc; 251 u8 gpio_input; 252 #endif 253 u8 partnum; 254 speed_t min_speed; 255 speed_t max_speed; 256 bool use_actual_rate; 257 }; 258 259 enum cp210x_event_state { 260 ES_DATA, 261 ES_ESCAPE, 262 ES_LSR, 263 ES_LSR_DATA_0, 264 ES_LSR_DATA_1, 265 ES_MSR 266 }; 267 268 struct cp210x_port_private { 269 u8 bInterfaceNumber; 270 bool has_swapped_line_ctl; 271 bool event_mode; 272 enum cp210x_event_state event_state; 273 u8 lsr; 274 }; 275 276 static struct usb_serial_driver cp210x_device = { 277 .driver = { 278 .owner = THIS_MODULE, 279 .name = "cp210x", 280 }, 281 .id_table = id_table, 282 .num_ports = 1, 283 .bulk_in_size = 256, 284 .bulk_out_size = 256, 285 .open = cp210x_open, 286 .close = cp210x_close, 287 .break_ctl = cp210x_break_ctl, 288 .set_termios = cp210x_set_termios, 289 .tx_empty = cp210x_tx_empty, 290 .throttle = usb_serial_generic_throttle, 291 .unthrottle = usb_serial_generic_unthrottle, 292 .tiocmget = cp210x_tiocmget, 293 .tiocmset = cp210x_tiocmset, 294 .get_icount = usb_serial_generic_get_icount, 295 .attach = cp210x_attach, 296 .disconnect = cp210x_disconnect, 297 .release = cp210x_release, 298 .port_probe = cp210x_port_probe, 299 .port_remove = cp210x_port_remove, 300 .dtr_rts = cp210x_dtr_rts, 301 .process_read_urb = cp210x_process_read_urb, 302 }; 303 304 static struct usb_serial_driver * const serial_drivers[] = { 305 &cp210x_device, NULL 306 }; 307 308 /* Config request types */ 309 #define REQTYPE_HOST_TO_INTERFACE 0x41 310 #define REQTYPE_INTERFACE_TO_HOST 0xc1 311 #define REQTYPE_HOST_TO_DEVICE 0x40 312 #define REQTYPE_DEVICE_TO_HOST 0xc0 313 314 /* Config request codes */ 315 #define CP210X_IFC_ENABLE 0x00 316 #define CP210X_SET_BAUDDIV 0x01 317 #define CP210X_GET_BAUDDIV 0x02 318 #define CP210X_SET_LINE_CTL 0x03 319 #define CP210X_GET_LINE_CTL 0x04 320 #define CP210X_SET_BREAK 0x05 321 #define CP210X_IMM_CHAR 0x06 322 #define CP210X_SET_MHS 0x07 323 #define CP210X_GET_MDMSTS 0x08 324 #define CP210X_SET_XON 0x09 325 #define CP210X_SET_XOFF 0x0A 326 #define CP210X_SET_EVENTMASK 0x0B 327 #define CP210X_GET_EVENTMASK 0x0C 328 #define CP210X_SET_CHAR 0x0D 329 #define CP210X_GET_CHARS 0x0E 330 #define CP210X_GET_PROPS 0x0F 331 #define CP210X_GET_COMM_STATUS 0x10 332 #define CP210X_RESET 0x11 333 #define CP210X_PURGE 0x12 334 #define CP210X_SET_FLOW 0x13 335 #define CP210X_GET_FLOW 0x14 336 #define CP210X_EMBED_EVENTS 0x15 337 #define CP210X_GET_EVENTSTATE 0x16 338 #define CP210X_SET_CHARS 0x19 339 #define CP210X_GET_BAUDRATE 0x1D 340 #define CP210X_SET_BAUDRATE 0x1E 341 #define CP210X_VENDOR_SPECIFIC 0xFF 342 343 /* CP210X_IFC_ENABLE */ 344 #define UART_ENABLE 0x0001 345 #define UART_DISABLE 0x0000 346 347 /* CP210X_(SET|GET)_BAUDDIV */ 348 #define BAUD_RATE_GEN_FREQ 0x384000 349 350 /* CP210X_(SET|GET)_LINE_CTL */ 351 #define BITS_DATA_MASK 0X0f00 352 #define BITS_DATA_5 0X0500 353 #define BITS_DATA_6 0X0600 354 #define BITS_DATA_7 0X0700 355 #define BITS_DATA_8 0X0800 356 #define BITS_DATA_9 0X0900 357 358 #define BITS_PARITY_MASK 0x00f0 359 #define BITS_PARITY_NONE 0x0000 360 #define BITS_PARITY_ODD 0x0010 361 #define BITS_PARITY_EVEN 0x0020 362 #define BITS_PARITY_MARK 0x0030 363 #define BITS_PARITY_SPACE 0x0040 364 365 #define BITS_STOP_MASK 0x000f 366 #define BITS_STOP_1 0x0000 367 #define BITS_STOP_1_5 0x0001 368 #define BITS_STOP_2 0x0002 369 370 /* CP210X_SET_BREAK */ 371 #define BREAK_ON 0x0001 372 #define BREAK_OFF 0x0000 373 374 /* CP210X_(SET_MHS|GET_MDMSTS) */ 375 #define CONTROL_DTR 0x0001 376 #define CONTROL_RTS 0x0002 377 #define CONTROL_CTS 0x0010 378 #define CONTROL_DSR 0x0020 379 #define CONTROL_RING 0x0040 380 #define CONTROL_DCD 0x0080 381 #define CONTROL_WRITE_DTR 0x0100 382 #define CONTROL_WRITE_RTS 0x0200 383 384 /* CP210X_VENDOR_SPECIFIC values */ 385 #define CP210X_READ_2NCONFIG 0x000E 386 #define CP210X_READ_LATCH 0x00C2 387 #define CP210X_GET_PARTNUM 0x370B 388 #define CP210X_GET_PORTCONFIG 0x370C 389 #define CP210X_GET_DEVICEMODE 0x3711 390 #define CP210X_WRITE_LATCH 0x37E1 391 392 /* Part number definitions */ 393 #define CP210X_PARTNUM_CP2101 0x01 394 #define CP210X_PARTNUM_CP2102 0x02 395 #define CP210X_PARTNUM_CP2103 0x03 396 #define CP210X_PARTNUM_CP2104 0x04 397 #define CP210X_PARTNUM_CP2105 0x05 398 #define CP210X_PARTNUM_CP2108 0x08 399 #define CP210X_PARTNUM_CP2102N_QFN28 0x20 400 #define CP210X_PARTNUM_CP2102N_QFN24 0x21 401 #define CP210X_PARTNUM_CP2102N_QFN20 0x22 402 #define CP210X_PARTNUM_UNKNOWN 0xFF 403 404 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 405 struct cp210x_comm_status { 406 __le32 ulErrors; 407 __le32 ulHoldReasons; 408 __le32 ulAmountInInQueue; 409 __le32 ulAmountInOutQueue; 410 u8 bEofReceived; 411 u8 bWaitForImmediate; 412 u8 bReserved; 413 } __packed; 414 415 /* 416 * CP210X_PURGE - 16 bits passed in wValue of USB request. 417 * SiLabs app note AN571 gives a strange description of the 4 bits: 418 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 419 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 420 */ 421 #define PURGE_ALL 0x000f 422 423 /* CP210X_EMBED_EVENTS */ 424 #define CP210X_ESCCHAR 0xec 425 426 #define CP210X_LSR_OVERRUN BIT(1) 427 #define CP210X_LSR_PARITY BIT(2) 428 #define CP210X_LSR_FRAME BIT(3) 429 #define CP210X_LSR_BREAK BIT(4) 430 431 432 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */ 433 struct cp210x_flow_ctl { 434 __le32 ulControlHandshake; 435 __le32 ulFlowReplace; 436 __le32 ulXonLimit; 437 __le32 ulXoffLimit; 438 }; 439 440 /* cp210x_flow_ctl::ulControlHandshake */ 441 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0) 442 #define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode) 443 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3) 444 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4) 445 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5) 446 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6) 447 448 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */ 449 #define CP210X_SERIAL_DTR_INACTIVE 0 450 #define CP210X_SERIAL_DTR_ACTIVE 1 451 #define CP210X_SERIAL_DTR_FLOW_CTL 2 452 453 /* cp210x_flow_ctl::ulFlowReplace */ 454 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0) 455 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1) 456 #define CP210X_SERIAL_ERROR_CHAR BIT(2) 457 #define CP210X_SERIAL_NULL_STRIPPING BIT(3) 458 #define CP210X_SERIAL_BREAK_CHAR BIT(4) 459 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6) 460 #define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6) 461 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31) 462 463 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */ 464 #define CP210X_SERIAL_RTS_INACTIVE 0 465 #define CP210X_SERIAL_RTS_ACTIVE 1 466 #define CP210X_SERIAL_RTS_FLOW_CTL 2 467 468 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */ 469 struct cp210x_pin_mode { 470 u8 eci; 471 u8 sci; 472 }; 473 474 #define CP210X_PIN_MODE_MODEM 0 475 #define CP210X_PIN_MODE_GPIO BIT(0) 476 477 /* 478 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes 479 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes. 480 */ 481 struct cp210x_dual_port_config { 482 __le16 gpio_mode; 483 u8 __pad0[2]; 484 __le16 reset_state; 485 u8 __pad1[4]; 486 __le16 suspend_state; 487 u8 sci_cfg; 488 u8 eci_cfg; 489 u8 device_cfg; 490 } __packed; 491 492 /* 493 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes 494 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes. 495 */ 496 struct cp210x_single_port_config { 497 __le16 gpio_mode; 498 u8 __pad0[2]; 499 __le16 reset_state; 500 u8 __pad1[4]; 501 __le16 suspend_state; 502 u8 device_cfg; 503 } __packed; 504 505 /* GPIO modes */ 506 #define CP210X_SCI_GPIO_MODE_OFFSET 9 507 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9) 508 509 #define CP210X_ECI_GPIO_MODE_OFFSET 2 510 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2) 511 512 #define CP210X_GPIO_MODE_OFFSET 8 513 #define CP210X_GPIO_MODE_MASK GENMASK(11, 8) 514 515 /* CP2105 port configuration values */ 516 #define CP2105_GPIO0_TXLED_MODE BIT(0) 517 #define CP2105_GPIO1_RXLED_MODE BIT(1) 518 #define CP2105_GPIO1_RS485_MODE BIT(2) 519 520 /* CP2104 port configuration values */ 521 #define CP2104_GPIO0_TXLED_MODE BIT(0) 522 #define CP2104_GPIO1_RXLED_MODE BIT(1) 523 #define CP2104_GPIO2_RS485_MODE BIT(2) 524 525 /* CP2102N configuration array indices */ 526 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2 527 #define CP210X_2NCONFIG_GPIO_MODE_IDX 581 528 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587 529 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600 530 531 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */ 532 struct cp210x_gpio_write { 533 u8 mask; 534 u8 state; 535 }; 536 537 /* 538 * Helper to get interface number when we only have struct usb_serial. 539 */ 540 static u8 cp210x_interface_num(struct usb_serial *serial) 541 { 542 struct usb_host_interface *cur_altsetting; 543 544 cur_altsetting = serial->interface->cur_altsetting; 545 546 return cur_altsetting->desc.bInterfaceNumber; 547 } 548 549 /* 550 * Reads a variable-sized block of CP210X_ registers, identified by req. 551 * Returns data into buf in native USB byte order. 552 */ 553 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, 554 void *buf, int bufsize) 555 { 556 struct usb_serial *serial = port->serial; 557 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 558 void *dmabuf; 559 int result; 560 561 dmabuf = kmalloc(bufsize, GFP_KERNEL); 562 if (!dmabuf) { 563 /* 564 * FIXME Some callers don't bother to check for error, 565 * at least give them consistent junk until they are fixed 566 */ 567 memset(buf, 0, bufsize); 568 return -ENOMEM; 569 } 570 571 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 572 req, REQTYPE_INTERFACE_TO_HOST, 0, 573 port_priv->bInterfaceNumber, dmabuf, bufsize, 574 USB_CTRL_SET_TIMEOUT); 575 if (result == bufsize) { 576 memcpy(buf, dmabuf, bufsize); 577 result = 0; 578 } else { 579 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", 580 req, bufsize, result); 581 if (result >= 0) 582 result = -EIO; 583 584 /* 585 * FIXME Some callers don't bother to check for error, 586 * at least give them consistent junk until they are fixed 587 */ 588 memset(buf, 0, bufsize); 589 } 590 591 kfree(dmabuf); 592 593 return result; 594 } 595 596 /* 597 * Reads any 32-bit CP210X_ register identified by req. 598 */ 599 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val) 600 { 601 __le32 le32_val; 602 int err; 603 604 err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val)); 605 if (err) { 606 /* 607 * FIXME Some callers don't bother to check for error, 608 * at least give them consistent junk until they are fixed 609 */ 610 *val = 0; 611 return err; 612 } 613 614 *val = le32_to_cpu(le32_val); 615 616 return 0; 617 } 618 619 /* 620 * Reads any 16-bit CP210X_ register identified by req. 621 */ 622 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val) 623 { 624 __le16 le16_val; 625 int err; 626 627 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val)); 628 if (err) 629 return err; 630 631 *val = le16_to_cpu(le16_val); 632 633 return 0; 634 } 635 636 /* 637 * Reads any 8-bit CP210X_ register identified by req. 638 */ 639 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val) 640 { 641 return cp210x_read_reg_block(port, req, val, sizeof(*val)); 642 } 643 644 /* 645 * Reads a variable-sized vendor block of CP210X_ registers, identified by val. 646 * Returns data into buf in native USB byte order. 647 */ 648 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val, 649 void *buf, int bufsize) 650 { 651 void *dmabuf; 652 int result; 653 654 dmabuf = kmalloc(bufsize, GFP_KERNEL); 655 if (!dmabuf) 656 return -ENOMEM; 657 658 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 659 CP210X_VENDOR_SPECIFIC, type, val, 660 cp210x_interface_num(serial), dmabuf, bufsize, 661 USB_CTRL_GET_TIMEOUT); 662 if (result == bufsize) { 663 memcpy(buf, dmabuf, bufsize); 664 result = 0; 665 } else { 666 dev_err(&serial->interface->dev, 667 "failed to get vendor val 0x%04x size %d: %d\n", val, 668 bufsize, result); 669 if (result >= 0) 670 result = -EIO; 671 } 672 673 kfree(dmabuf); 674 675 return result; 676 } 677 678 /* 679 * Writes any 16-bit CP210X_ register (req) whose value is passed 680 * entirely in the wValue field of the USB request. 681 */ 682 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) 683 { 684 struct usb_serial *serial = port->serial; 685 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 686 int result; 687 688 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 689 req, REQTYPE_HOST_TO_INTERFACE, val, 690 port_priv->bInterfaceNumber, NULL, 0, 691 USB_CTRL_SET_TIMEOUT); 692 if (result < 0) { 693 dev_err(&port->dev, "failed set request 0x%x status: %d\n", 694 req, result); 695 } 696 697 return result; 698 } 699 700 /* 701 * Writes a variable-sized block of CP210X_ registers, identified by req. 702 * Data in buf must be in native USB byte order. 703 */ 704 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req, 705 void *buf, int bufsize) 706 { 707 struct usb_serial *serial = port->serial; 708 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 709 void *dmabuf; 710 int result; 711 712 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 713 if (!dmabuf) 714 return -ENOMEM; 715 716 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 717 req, REQTYPE_HOST_TO_INTERFACE, 0, 718 port_priv->bInterfaceNumber, dmabuf, bufsize, 719 USB_CTRL_SET_TIMEOUT); 720 721 kfree(dmabuf); 722 723 if (result == bufsize) { 724 result = 0; 725 } else { 726 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", 727 req, bufsize, result); 728 if (result >= 0) 729 result = -EIO; 730 } 731 732 return result; 733 } 734 735 /* 736 * Writes any 32-bit CP210X_ register identified by req. 737 */ 738 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) 739 { 740 __le32 le32_val; 741 742 le32_val = cpu_to_le32(val); 743 744 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); 745 } 746 747 #ifdef CONFIG_GPIOLIB 748 /* 749 * Writes a variable-sized vendor block of CP210X_ registers, identified by val. 750 * Data in buf must be in native USB byte order. 751 */ 752 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type, 753 u16 val, void *buf, int bufsize) 754 { 755 void *dmabuf; 756 int result; 757 758 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 759 if (!dmabuf) 760 return -ENOMEM; 761 762 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 763 CP210X_VENDOR_SPECIFIC, type, val, 764 cp210x_interface_num(serial), dmabuf, bufsize, 765 USB_CTRL_SET_TIMEOUT); 766 767 kfree(dmabuf); 768 769 if (result == bufsize) { 770 result = 0; 771 } else { 772 dev_err(&serial->interface->dev, 773 "failed to set vendor val 0x%04x size %d: %d\n", val, 774 bufsize, result); 775 if (result >= 0) 776 result = -EIO; 777 } 778 779 return result; 780 } 781 #endif 782 783 /* 784 * Detect CP2108 GET_LINE_CTL bug and activate workaround. 785 * Write a known good value 0x800, read it back. 786 * If it comes back swapped the bug is detected. 787 * Preserve the original register value. 788 */ 789 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port) 790 { 791 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 792 u16 line_ctl_save; 793 u16 line_ctl_test; 794 int err; 795 796 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save); 797 if (err) 798 return err; 799 800 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800); 801 if (err) 802 return err; 803 804 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test); 805 if (err) 806 return err; 807 808 if (line_ctl_test == 8) { 809 port_priv->has_swapped_line_ctl = true; 810 line_ctl_save = swab16(line_ctl_save); 811 } 812 813 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save); 814 } 815 816 /* 817 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL) 818 * to workaround cp2108 bug and get correct value. 819 */ 820 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl) 821 { 822 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 823 int err; 824 825 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl); 826 if (err) 827 return err; 828 829 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */ 830 if (port_priv->has_swapped_line_ctl) 831 *ctl = swab16(*ctl); 832 833 return 0; 834 } 835 836 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 837 { 838 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 839 int result; 840 841 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 842 if (result) { 843 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 844 return result; 845 } 846 847 /* Configure the termios structure */ 848 cp210x_get_termios(tty, port); 849 850 if (tty) { 851 /* The baud rate must be initialised on cp2104 */ 852 cp210x_change_speed(tty, port, NULL); 853 854 if (I_INPCK(tty)) 855 cp210x_enable_event_mode(port); 856 } 857 858 result = usb_serial_generic_open(tty, port); 859 if (result) 860 goto err_disable; 861 862 return 0; 863 864 err_disable: 865 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 866 port_priv->event_mode = false; 867 868 return result; 869 } 870 871 static void cp210x_close(struct usb_serial_port *port) 872 { 873 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 874 875 usb_serial_generic_close(port); 876 877 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 878 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 879 880 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 881 882 /* Disabling the interface disables event-insertion mode. */ 883 port_priv->event_mode = false; 884 } 885 886 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag) 887 { 888 if (lsr & CP210X_LSR_BREAK) { 889 port->icount.brk++; 890 *flag = TTY_BREAK; 891 } else if (lsr & CP210X_LSR_PARITY) { 892 port->icount.parity++; 893 *flag = TTY_PARITY; 894 } else if (lsr & CP210X_LSR_FRAME) { 895 port->icount.frame++; 896 *flag = TTY_FRAME; 897 } 898 899 if (lsr & CP210X_LSR_OVERRUN) { 900 port->icount.overrun++; 901 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); 902 } 903 } 904 905 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag) 906 { 907 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 908 909 switch (port_priv->event_state) { 910 case ES_DATA: 911 if (*ch == CP210X_ESCCHAR) { 912 port_priv->event_state = ES_ESCAPE; 913 break; 914 } 915 return false; 916 case ES_ESCAPE: 917 switch (*ch) { 918 case 0: 919 dev_dbg(&port->dev, "%s - escape char\n", __func__); 920 *ch = CP210X_ESCCHAR; 921 port_priv->event_state = ES_DATA; 922 return false; 923 case 1: 924 port_priv->event_state = ES_LSR_DATA_0; 925 break; 926 case 2: 927 port_priv->event_state = ES_LSR; 928 break; 929 case 3: 930 port_priv->event_state = ES_MSR; 931 break; 932 default: 933 dev_err(&port->dev, "malformed event 0x%02x\n", *ch); 934 port_priv->event_state = ES_DATA; 935 break; 936 } 937 break; 938 case ES_LSR_DATA_0: 939 port_priv->lsr = *ch; 940 port_priv->event_state = ES_LSR_DATA_1; 941 break; 942 case ES_LSR_DATA_1: 943 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n", 944 __func__, port_priv->lsr, *ch); 945 cp210x_process_lsr(port, port_priv->lsr, flag); 946 port_priv->event_state = ES_DATA; 947 return false; 948 case ES_LSR: 949 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch); 950 port_priv->lsr = *ch; 951 cp210x_process_lsr(port, port_priv->lsr, flag); 952 port_priv->event_state = ES_DATA; 953 break; 954 case ES_MSR: 955 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch); 956 /* unimplemented */ 957 port_priv->event_state = ES_DATA; 958 break; 959 } 960 961 return true; 962 } 963 964 static void cp210x_process_read_urb(struct urb *urb) 965 { 966 struct usb_serial_port *port = urb->context; 967 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 968 unsigned char *ch = urb->transfer_buffer; 969 char flag; 970 int i; 971 972 if (!urb->actual_length) 973 return; 974 975 if (port_priv->event_mode) { 976 for (i = 0; i < urb->actual_length; i++, ch++) { 977 flag = TTY_NORMAL; 978 979 if (cp210x_process_char(port, ch, &flag)) 980 continue; 981 982 tty_insert_flip_char(&port->port, *ch, flag); 983 } 984 } else { 985 tty_insert_flip_string(&port->port, ch, urb->actual_length); 986 } 987 tty_flip_buffer_push(&port->port); 988 } 989 990 /* 991 * Read how many bytes are waiting in the TX queue. 992 */ 993 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 994 u32 *count) 995 { 996 struct usb_serial *serial = port->serial; 997 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 998 struct cp210x_comm_status *sts; 999 int result; 1000 1001 sts = kmalloc(sizeof(*sts), GFP_KERNEL); 1002 if (!sts) 1003 return -ENOMEM; 1004 1005 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 1006 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST, 1007 0, port_priv->bInterfaceNumber, sts, sizeof(*sts), 1008 USB_CTRL_GET_TIMEOUT); 1009 if (result == sizeof(*sts)) { 1010 *count = le32_to_cpu(sts->ulAmountInOutQueue); 1011 result = 0; 1012 } else { 1013 dev_err(&port->dev, "failed to get comm status: %d\n", result); 1014 if (result >= 0) 1015 result = -EIO; 1016 } 1017 1018 kfree(sts); 1019 1020 return result; 1021 } 1022 1023 static bool cp210x_tx_empty(struct usb_serial_port *port) 1024 { 1025 int err; 1026 u32 count; 1027 1028 err = cp210x_get_tx_queue_byte_count(port, &count); 1029 if (err) 1030 return true; 1031 1032 return !count; 1033 } 1034 1035 /* 1036 * cp210x_get_termios 1037 * Reads the baud rate, data bits, parity, stop bits and flow control mode 1038 * from the device, corrects any unsupported values, and configures the 1039 * termios structure to reflect the state of the device 1040 */ 1041 static void cp210x_get_termios(struct tty_struct *tty, 1042 struct usb_serial_port *port) 1043 { 1044 unsigned int baud; 1045 1046 if (tty) { 1047 cp210x_get_termios_port(tty->driver_data, 1048 &tty->termios.c_cflag, &baud); 1049 tty_encode_baud_rate(tty, baud, baud); 1050 } else { 1051 tcflag_t cflag; 1052 cflag = 0; 1053 cp210x_get_termios_port(port, &cflag, &baud); 1054 } 1055 } 1056 1057 /* 1058 * cp210x_get_termios_port 1059 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port. 1060 */ 1061 static void cp210x_get_termios_port(struct usb_serial_port *port, 1062 tcflag_t *cflagp, unsigned int *baudp) 1063 { 1064 struct device *dev = &port->dev; 1065 tcflag_t cflag; 1066 struct cp210x_flow_ctl flow_ctl; 1067 u32 baud; 1068 u16 bits; 1069 u32 ctl_hs; 1070 u32 flow_repl; 1071 1072 cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud); 1073 1074 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud); 1075 *baudp = baud; 1076 1077 cflag = *cflagp; 1078 1079 cp210x_get_line_ctl(port, &bits); 1080 cflag &= ~CSIZE; 1081 switch (bits & BITS_DATA_MASK) { 1082 case BITS_DATA_5: 1083 dev_dbg(dev, "%s - data bits = 5\n", __func__); 1084 cflag |= CS5; 1085 break; 1086 case BITS_DATA_6: 1087 dev_dbg(dev, "%s - data bits = 6\n", __func__); 1088 cflag |= CS6; 1089 break; 1090 case BITS_DATA_7: 1091 dev_dbg(dev, "%s - data bits = 7\n", __func__); 1092 cflag |= CS7; 1093 break; 1094 case BITS_DATA_8: 1095 dev_dbg(dev, "%s - data bits = 8\n", __func__); 1096 cflag |= CS8; 1097 break; 1098 case BITS_DATA_9: 1099 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__); 1100 cflag |= CS8; 1101 bits &= ~BITS_DATA_MASK; 1102 bits |= BITS_DATA_8; 1103 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1104 break; 1105 default: 1106 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__); 1107 cflag |= CS8; 1108 bits &= ~BITS_DATA_MASK; 1109 bits |= BITS_DATA_8; 1110 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1111 break; 1112 } 1113 1114 switch (bits & BITS_PARITY_MASK) { 1115 case BITS_PARITY_NONE: 1116 dev_dbg(dev, "%s - parity = NONE\n", __func__); 1117 cflag &= ~PARENB; 1118 break; 1119 case BITS_PARITY_ODD: 1120 dev_dbg(dev, "%s - parity = ODD\n", __func__); 1121 cflag |= (PARENB|PARODD); 1122 break; 1123 case BITS_PARITY_EVEN: 1124 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 1125 cflag &= ~PARODD; 1126 cflag |= PARENB; 1127 break; 1128 case BITS_PARITY_MARK: 1129 dev_dbg(dev, "%s - parity = MARK\n", __func__); 1130 cflag |= (PARENB|PARODD|CMSPAR); 1131 break; 1132 case BITS_PARITY_SPACE: 1133 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 1134 cflag &= ~PARODD; 1135 cflag |= (PARENB|CMSPAR); 1136 break; 1137 default: 1138 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__); 1139 cflag &= ~PARENB; 1140 bits &= ~BITS_PARITY_MASK; 1141 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1142 break; 1143 } 1144 1145 cflag &= ~CSTOPB; 1146 switch (bits & BITS_STOP_MASK) { 1147 case BITS_STOP_1: 1148 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 1149 break; 1150 case BITS_STOP_1_5: 1151 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__); 1152 bits &= ~BITS_STOP_MASK; 1153 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1154 break; 1155 case BITS_STOP_2: 1156 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 1157 cflag |= CSTOPB; 1158 break; 1159 default: 1160 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__); 1161 bits &= ~BITS_STOP_MASK; 1162 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1163 break; 1164 } 1165 1166 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1167 sizeof(flow_ctl)); 1168 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1169 if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) { 1170 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 1171 /* 1172 * When the port is closed, the CP210x hardware disables 1173 * auto-RTS and RTS is deasserted but it leaves auto-CTS when 1174 * in hardware flow control mode. When re-opening the port, if 1175 * auto-CTS is enabled on the cp210x, then auto-RTS must be 1176 * re-enabled in the driver. 1177 */ 1178 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1179 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1180 flow_repl |= CP210X_SERIAL_RTS_SHIFT(CP210X_SERIAL_RTS_FLOW_CTL); 1181 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1182 cp210x_write_reg_block(port, 1183 CP210X_SET_FLOW, 1184 &flow_ctl, 1185 sizeof(flow_ctl)); 1186 1187 cflag |= CRTSCTS; 1188 } else { 1189 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 1190 cflag &= ~CRTSCTS; 1191 } 1192 1193 *cflagp = cflag; 1194 } 1195 1196 struct cp210x_rate { 1197 speed_t rate; 1198 speed_t high; 1199 }; 1200 1201 static const struct cp210x_rate cp210x_an205_table1[] = { 1202 { 300, 300 }, 1203 { 600, 600 }, 1204 { 1200, 1200 }, 1205 { 1800, 1800 }, 1206 { 2400, 2400 }, 1207 { 4000, 4000 }, 1208 { 4800, 4803 }, 1209 { 7200, 7207 }, 1210 { 9600, 9612 }, 1211 { 14400, 14428 }, 1212 { 16000, 16062 }, 1213 { 19200, 19250 }, 1214 { 28800, 28912 }, 1215 { 38400, 38601 }, 1216 { 51200, 51558 }, 1217 { 56000, 56280 }, 1218 { 57600, 58053 }, 1219 { 64000, 64111 }, 1220 { 76800, 77608 }, 1221 { 115200, 117028 }, 1222 { 128000, 129347 }, 1223 { 153600, 156868 }, 1224 { 230400, 237832 }, 1225 { 250000, 254234 }, 1226 { 256000, 273066 }, 1227 { 460800, 491520 }, 1228 { 500000, 567138 }, 1229 { 576000, 670254 }, 1230 { 921600, UINT_MAX } 1231 }; 1232 1233 /* 1234 * Quantises the baud rate as per AN205 Table 1 1235 */ 1236 static speed_t cp210x_get_an205_rate(speed_t baud) 1237 { 1238 int i; 1239 1240 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) { 1241 if (baud <= cp210x_an205_table1[i].high) 1242 break; 1243 } 1244 1245 return cp210x_an205_table1[i].rate; 1246 } 1247 1248 static speed_t cp210x_get_actual_rate(speed_t baud) 1249 { 1250 unsigned int prescale = 1; 1251 unsigned int div; 1252 1253 if (baud <= 365) 1254 prescale = 4; 1255 1256 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud); 1257 baud = 48000000 / (2 * prescale * div); 1258 1259 return baud; 1260 } 1261 1262 /* 1263 * CP2101 supports the following baud rates: 1264 * 1265 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 1266 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 1267 * 1268 * CP2102 and CP2103 support the following additional rates: 1269 * 1270 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 1271 * 576000 1272 * 1273 * The device will map a requested rate to a supported one, but the result 1274 * of requests for rates greater than 1053257 is undefined (see AN205). 1275 * 1276 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 1277 * respectively, with an error less than 1%. The actual rates are determined 1278 * by 1279 * 1280 * div = round(freq / (2 x prescale x request)) 1281 * actual = freq / (2 x prescale x div) 1282 * 1283 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 1284 * or 1 otherwise. 1285 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 1286 * otherwise. 1287 */ 1288 static void cp210x_change_speed(struct tty_struct *tty, 1289 struct usb_serial_port *port, struct ktermios *old_termios) 1290 { 1291 struct usb_serial *serial = port->serial; 1292 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1293 u32 baud; 1294 1295 /* 1296 * This maps the requested rate to the actual rate, a valid rate on 1297 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed]. 1298 * 1299 * NOTE: B0 is not implemented. 1300 */ 1301 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed); 1302 1303 if (priv->use_actual_rate) 1304 baud = cp210x_get_actual_rate(baud); 1305 else if (baud < 1000000) 1306 baud = cp210x_get_an205_rate(baud); 1307 1308 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 1309 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { 1310 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 1311 if (old_termios) 1312 baud = old_termios->c_ospeed; 1313 else 1314 baud = 9600; 1315 } 1316 1317 tty_encode_baud_rate(tty, baud, baud); 1318 } 1319 1320 static void cp210x_enable_event_mode(struct usb_serial_port *port) 1321 { 1322 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1323 int ret; 1324 1325 if (port_priv->event_mode) 1326 return; 1327 1328 port_priv->event_state = ES_DATA; 1329 port_priv->event_mode = true; 1330 1331 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR); 1332 if (ret) { 1333 dev_err(&port->dev, "failed to enable events: %d\n", ret); 1334 port_priv->event_mode = false; 1335 } 1336 } 1337 1338 static void cp210x_disable_event_mode(struct usb_serial_port *port) 1339 { 1340 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1341 int ret; 1342 1343 if (!port_priv->event_mode) 1344 return; 1345 1346 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0); 1347 if (ret) { 1348 dev_err(&port->dev, "failed to disable events: %d\n", ret); 1349 return; 1350 } 1351 1352 port_priv->event_mode = false; 1353 } 1354 1355 static void cp210x_set_termios(struct tty_struct *tty, 1356 struct usb_serial_port *port, struct ktermios *old_termios) 1357 { 1358 struct device *dev = &port->dev; 1359 unsigned int cflag, old_cflag; 1360 u16 bits; 1361 1362 cflag = tty->termios.c_cflag; 1363 old_cflag = old_termios->c_cflag; 1364 1365 if (tty->termios.c_ospeed != old_termios->c_ospeed) 1366 cp210x_change_speed(tty, port, old_termios); 1367 1368 /* If the number of data bits is to be updated */ 1369 if ((cflag & CSIZE) != (old_cflag & CSIZE)) { 1370 cp210x_get_line_ctl(port, &bits); 1371 bits &= ~BITS_DATA_MASK; 1372 switch (cflag & CSIZE) { 1373 case CS5: 1374 bits |= BITS_DATA_5; 1375 dev_dbg(dev, "%s - data bits = 5\n", __func__); 1376 break; 1377 case CS6: 1378 bits |= BITS_DATA_6; 1379 dev_dbg(dev, "%s - data bits = 6\n", __func__); 1380 break; 1381 case CS7: 1382 bits |= BITS_DATA_7; 1383 dev_dbg(dev, "%s - data bits = 7\n", __func__); 1384 break; 1385 case CS8: 1386 default: 1387 bits |= BITS_DATA_8; 1388 dev_dbg(dev, "%s - data bits = 8\n", __func__); 1389 break; 1390 } 1391 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 1392 dev_dbg(dev, "Number of data bits requested not supported by device\n"); 1393 } 1394 1395 if ((cflag & (PARENB|PARODD|CMSPAR)) != 1396 (old_cflag & (PARENB|PARODD|CMSPAR))) { 1397 cp210x_get_line_ctl(port, &bits); 1398 bits &= ~BITS_PARITY_MASK; 1399 if (cflag & PARENB) { 1400 if (cflag & CMSPAR) { 1401 if (cflag & PARODD) { 1402 bits |= BITS_PARITY_MARK; 1403 dev_dbg(dev, "%s - parity = MARK\n", __func__); 1404 } else { 1405 bits |= BITS_PARITY_SPACE; 1406 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 1407 } 1408 } else { 1409 if (cflag & PARODD) { 1410 bits |= BITS_PARITY_ODD; 1411 dev_dbg(dev, "%s - parity = ODD\n", __func__); 1412 } else { 1413 bits |= BITS_PARITY_EVEN; 1414 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 1415 } 1416 } 1417 } 1418 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 1419 dev_dbg(dev, "Parity mode not supported by device\n"); 1420 } 1421 1422 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { 1423 cp210x_get_line_ctl(port, &bits); 1424 bits &= ~BITS_STOP_MASK; 1425 if (cflag & CSTOPB) { 1426 bits |= BITS_STOP_2; 1427 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 1428 } else { 1429 bits |= BITS_STOP_1; 1430 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 1431 } 1432 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 1433 dev_dbg(dev, "Number of stop bits requested not supported by device\n"); 1434 } 1435 1436 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 1437 struct cp210x_flow_ctl flow_ctl; 1438 u32 ctl_hs; 1439 u32 flow_repl; 1440 1441 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1442 sizeof(flow_ctl)); 1443 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1444 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1445 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n", 1446 __func__, ctl_hs, flow_repl); 1447 1448 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE; 1449 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE; 1450 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY; 1451 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1452 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE); 1453 if (cflag & CRTSCTS) { 1454 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE; 1455 1456 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1457 flow_repl |= CP210X_SERIAL_RTS_SHIFT( 1458 CP210X_SERIAL_RTS_FLOW_CTL); 1459 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 1460 } else { 1461 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE; 1462 1463 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1464 flow_repl |= CP210X_SERIAL_RTS_SHIFT( 1465 CP210X_SERIAL_RTS_ACTIVE); 1466 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 1467 } 1468 1469 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n", 1470 __func__, ctl_hs, flow_repl); 1471 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1472 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1473 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1474 sizeof(flow_ctl)); 1475 } 1476 1477 /* 1478 * Enable event-insertion mode only if input parity checking is 1479 * enabled for now. 1480 */ 1481 if (I_INPCK(tty)) 1482 cp210x_enable_event_mode(port); 1483 else 1484 cp210x_disable_event_mode(port); 1485 } 1486 1487 static int cp210x_tiocmset(struct tty_struct *tty, 1488 unsigned int set, unsigned int clear) 1489 { 1490 struct usb_serial_port *port = tty->driver_data; 1491 return cp210x_tiocmset_port(port, set, clear); 1492 } 1493 1494 static int cp210x_tiocmset_port(struct usb_serial_port *port, 1495 unsigned int set, unsigned int clear) 1496 { 1497 u16 control = 0; 1498 1499 if (set & TIOCM_RTS) { 1500 control |= CONTROL_RTS; 1501 control |= CONTROL_WRITE_RTS; 1502 } 1503 if (set & TIOCM_DTR) { 1504 control |= CONTROL_DTR; 1505 control |= CONTROL_WRITE_DTR; 1506 } 1507 if (clear & TIOCM_RTS) { 1508 control &= ~CONTROL_RTS; 1509 control |= CONTROL_WRITE_RTS; 1510 } 1511 if (clear & TIOCM_DTR) { 1512 control &= ~CONTROL_DTR; 1513 control |= CONTROL_WRITE_DTR; 1514 } 1515 1516 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control); 1517 1518 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1519 } 1520 1521 static void cp210x_dtr_rts(struct usb_serial_port *p, int on) 1522 { 1523 if (on) 1524 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0); 1525 else 1526 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS); 1527 } 1528 1529 static int cp210x_tiocmget(struct tty_struct *tty) 1530 { 1531 struct usb_serial_port *port = tty->driver_data; 1532 u8 control; 1533 int result; 1534 1535 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1536 if (result) 1537 return result; 1538 1539 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1540 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1541 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1542 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1543 |((control & CONTROL_RING)? TIOCM_RI : 0) 1544 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1545 1546 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control); 1547 1548 return result; 1549 } 1550 1551 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 1552 { 1553 struct usb_serial_port *port = tty->driver_data; 1554 u16 state; 1555 1556 if (break_state == 0) 1557 state = BREAK_OFF; 1558 else 1559 state = BREAK_ON; 1560 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1561 state == BREAK_OFF ? "off" : "on"); 1562 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1563 } 1564 1565 #ifdef CONFIG_GPIOLIB 1566 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset) 1567 { 1568 struct usb_serial *serial = gpiochip_get_data(gc); 1569 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1570 1571 if (priv->gpio_altfunc & BIT(offset)) 1572 return -ENODEV; 1573 1574 return 0; 1575 } 1576 1577 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio) 1578 { 1579 struct usb_serial *serial = gpiochip_get_data(gc); 1580 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1581 u8 req_type = REQTYPE_DEVICE_TO_HOST; 1582 int result; 1583 u8 buf; 1584 1585 if (priv->partnum == CP210X_PARTNUM_CP2105) 1586 req_type = REQTYPE_INTERFACE_TO_HOST; 1587 1588 result = usb_autopm_get_interface(serial->interface); 1589 if (result) 1590 return result; 1591 1592 result = cp210x_read_vendor_block(serial, req_type, 1593 CP210X_READ_LATCH, &buf, sizeof(buf)); 1594 usb_autopm_put_interface(serial->interface); 1595 if (result < 0) 1596 return result; 1597 1598 return !!(buf & BIT(gpio)); 1599 } 1600 1601 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value) 1602 { 1603 struct usb_serial *serial = gpiochip_get_data(gc); 1604 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1605 struct cp210x_gpio_write buf; 1606 int result; 1607 1608 if (value == 1) 1609 buf.state = BIT(gpio); 1610 else 1611 buf.state = 0; 1612 1613 buf.mask = BIT(gpio); 1614 1615 result = usb_autopm_get_interface(serial->interface); 1616 if (result) 1617 goto out; 1618 1619 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1620 result = cp210x_write_vendor_block(serial, 1621 REQTYPE_HOST_TO_INTERFACE, 1622 CP210X_WRITE_LATCH, &buf, 1623 sizeof(buf)); 1624 } else { 1625 u16 wIndex = buf.state << 8 | buf.mask; 1626 1627 result = usb_control_msg(serial->dev, 1628 usb_sndctrlpipe(serial->dev, 0), 1629 CP210X_VENDOR_SPECIFIC, 1630 REQTYPE_HOST_TO_DEVICE, 1631 CP210X_WRITE_LATCH, 1632 wIndex, 1633 NULL, 0, USB_CTRL_SET_TIMEOUT); 1634 } 1635 1636 usb_autopm_put_interface(serial->interface); 1637 out: 1638 if (result < 0) { 1639 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n", 1640 result); 1641 } 1642 } 1643 1644 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio) 1645 { 1646 struct usb_serial *serial = gpiochip_get_data(gc); 1647 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1648 1649 return priv->gpio_input & BIT(gpio); 1650 } 1651 1652 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio) 1653 { 1654 struct usb_serial *serial = gpiochip_get_data(gc); 1655 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1656 1657 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1658 /* hardware does not support an input mode */ 1659 return -ENOTSUPP; 1660 } 1661 1662 /* push-pull pins cannot be changed to be inputs */ 1663 if (priv->gpio_pushpull & BIT(gpio)) 1664 return -EINVAL; 1665 1666 /* make sure to release pin if it is being driven low */ 1667 cp210x_gpio_set(gc, gpio, 1); 1668 1669 priv->gpio_input |= BIT(gpio); 1670 1671 return 0; 1672 } 1673 1674 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio, 1675 int value) 1676 { 1677 struct usb_serial *serial = gpiochip_get_data(gc); 1678 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1679 1680 priv->gpio_input &= ~BIT(gpio); 1681 cp210x_gpio_set(gc, gpio, value); 1682 1683 return 0; 1684 } 1685 1686 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio, 1687 unsigned long config) 1688 { 1689 struct usb_serial *serial = gpiochip_get_data(gc); 1690 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1691 enum pin_config_param param = pinconf_to_config_param(config); 1692 1693 /* Succeed only if in correct mode (this can't be set at runtime) */ 1694 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) && 1695 (priv->gpio_pushpull & BIT(gpio))) 1696 return 0; 1697 1698 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) && 1699 !(priv->gpio_pushpull & BIT(gpio))) 1700 return 0; 1701 1702 return -ENOTSUPP; 1703 } 1704 1705 /* 1706 * This function is for configuring GPIO using shared pins, where other signals 1707 * are made unavailable by configuring the use of GPIO. This is believed to be 1708 * only applicable to the cp2105 at this point, the other devices supported by 1709 * this driver that provide GPIO do so in a way that does not impact other 1710 * signals and are thus expected to have very different initialisation. 1711 */ 1712 static int cp2105_gpioconf_init(struct usb_serial *serial) 1713 { 1714 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1715 struct cp210x_pin_mode mode; 1716 struct cp210x_dual_port_config config; 1717 u8 intf_num = cp210x_interface_num(serial); 1718 u8 iface_config; 1719 int result; 1720 1721 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1722 CP210X_GET_DEVICEMODE, &mode, 1723 sizeof(mode)); 1724 if (result < 0) 1725 return result; 1726 1727 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1728 CP210X_GET_PORTCONFIG, &config, 1729 sizeof(config)); 1730 if (result < 0) 1731 return result; 1732 1733 /* 2 banks of GPIO - One for the pins taken from each serial port */ 1734 if (intf_num == 0) { 1735 if (mode.eci == CP210X_PIN_MODE_MODEM) { 1736 /* mark all GPIOs of this interface as reserved */ 1737 priv->gpio_altfunc = 0xff; 1738 return 0; 1739 } 1740 1741 iface_config = config.eci_cfg; 1742 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1743 CP210X_ECI_GPIO_MODE_MASK) >> 1744 CP210X_ECI_GPIO_MODE_OFFSET); 1745 priv->gc.ngpio = 2; 1746 } else if (intf_num == 1) { 1747 if (mode.sci == CP210X_PIN_MODE_MODEM) { 1748 /* mark all GPIOs of this interface as reserved */ 1749 priv->gpio_altfunc = 0xff; 1750 return 0; 1751 } 1752 1753 iface_config = config.sci_cfg; 1754 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1755 CP210X_SCI_GPIO_MODE_MASK) >> 1756 CP210X_SCI_GPIO_MODE_OFFSET); 1757 priv->gc.ngpio = 3; 1758 } else { 1759 return -ENODEV; 1760 } 1761 1762 /* mark all pins which are not in GPIO mode */ 1763 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */ 1764 priv->gpio_altfunc |= BIT(0); 1765 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */ 1766 CP2105_GPIO1_RS485_MODE)) 1767 priv->gpio_altfunc |= BIT(1); 1768 1769 /* driver implementation for CP2105 only supports outputs */ 1770 priv->gpio_input = 0; 1771 1772 return 0; 1773 } 1774 1775 static int cp2104_gpioconf_init(struct usb_serial *serial) 1776 { 1777 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1778 struct cp210x_single_port_config config; 1779 u8 iface_config; 1780 u8 gpio_latch; 1781 int result; 1782 u8 i; 1783 1784 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1785 CP210X_GET_PORTCONFIG, &config, 1786 sizeof(config)); 1787 if (result < 0) 1788 return result; 1789 1790 priv->gc.ngpio = 4; 1791 1792 iface_config = config.device_cfg; 1793 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1794 CP210X_GPIO_MODE_MASK) >> 1795 CP210X_GPIO_MODE_OFFSET); 1796 gpio_latch = (u8)((le16_to_cpu(config.reset_state) & 1797 CP210X_GPIO_MODE_MASK) >> 1798 CP210X_GPIO_MODE_OFFSET); 1799 1800 /* mark all pins which are not in GPIO mode */ 1801 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */ 1802 priv->gpio_altfunc |= BIT(0); 1803 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */ 1804 priv->gpio_altfunc |= BIT(1); 1805 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */ 1806 priv->gpio_altfunc |= BIT(2); 1807 1808 /* 1809 * Like CP2102N, CP2104 has also no strict input and output pin 1810 * modes. 1811 * Do the same input mode emulation as CP2102N. 1812 */ 1813 for (i = 0; i < priv->gc.ngpio; ++i) { 1814 /* 1815 * Set direction to "input" iff pin is open-drain and reset 1816 * value is 1. 1817 */ 1818 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1819 priv->gpio_input |= BIT(i); 1820 } 1821 1822 return 0; 1823 } 1824 1825 static int cp2102n_gpioconf_init(struct usb_serial *serial) 1826 { 1827 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1828 const u16 config_size = 0x02a6; 1829 u8 gpio_rst_latch; 1830 u8 config_version; 1831 u8 gpio_pushpull; 1832 u8 *config_buf; 1833 u8 gpio_latch; 1834 u8 gpio_ctrl; 1835 int result; 1836 u8 i; 1837 1838 /* 1839 * Retrieve device configuration from the device. 1840 * The array received contains all customization settings done at the 1841 * factory/manufacturer. Format of the array is documented at the 1842 * time of writing at: 1843 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa 1844 */ 1845 config_buf = kmalloc(config_size, GFP_KERNEL); 1846 if (!config_buf) 1847 return -ENOMEM; 1848 1849 result = cp210x_read_vendor_block(serial, 1850 REQTYPE_DEVICE_TO_HOST, 1851 CP210X_READ_2NCONFIG, 1852 config_buf, 1853 config_size); 1854 if (result < 0) { 1855 kfree(config_buf); 1856 return result; 1857 } 1858 1859 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX]; 1860 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX]; 1861 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX]; 1862 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX]; 1863 1864 kfree(config_buf); 1865 1866 /* Make sure this is a config format we understand. */ 1867 if (config_version != 0x01) 1868 return -ENOTSUPP; 1869 1870 priv->gc.ngpio = 4; 1871 1872 /* 1873 * Get default pin states after reset. Needed so we can determine 1874 * the direction of an open-drain pin. 1875 */ 1876 gpio_latch = (gpio_rst_latch >> 3) & 0x0f; 1877 1878 /* 0 indicates open-drain mode, 1 is push-pull */ 1879 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f; 1880 1881 /* 0 indicates GPIO mode, 1 is alternate function */ 1882 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f; 1883 1884 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) { 1885 /* 1886 * For the QFN28 package, GPIO4-6 are controlled by 1887 * the low three bits of the mode/latch fields. 1888 * Contrary to the document linked above, the bits for 1889 * the SUSPEND pins are elsewhere. No alternate 1890 * function is available for these pins. 1891 */ 1892 priv->gc.ngpio = 7; 1893 gpio_latch |= (gpio_rst_latch & 7) << 4; 1894 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4; 1895 } 1896 1897 /* 1898 * The CP2102N does not strictly has input and output pin modes, 1899 * it only knows open-drain and push-pull modes which is set at 1900 * factory. An open-drain pin can function both as an 1901 * input or an output. We emulate input mode for open-drain pins 1902 * by making sure they are not driven low, and we do not allow 1903 * push-pull pins to be set as an input. 1904 */ 1905 for (i = 0; i < priv->gc.ngpio; ++i) { 1906 /* 1907 * Set direction to "input" iff pin is open-drain and reset 1908 * value is 1. 1909 */ 1910 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1911 priv->gpio_input |= BIT(i); 1912 } 1913 1914 return 0; 1915 } 1916 1917 static int cp210x_gpio_init(struct usb_serial *serial) 1918 { 1919 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1920 int result; 1921 1922 switch (priv->partnum) { 1923 case CP210X_PARTNUM_CP2104: 1924 result = cp2104_gpioconf_init(serial); 1925 break; 1926 case CP210X_PARTNUM_CP2105: 1927 result = cp2105_gpioconf_init(serial); 1928 break; 1929 case CP210X_PARTNUM_CP2102N_QFN28: 1930 case CP210X_PARTNUM_CP2102N_QFN24: 1931 case CP210X_PARTNUM_CP2102N_QFN20: 1932 result = cp2102n_gpioconf_init(serial); 1933 break; 1934 default: 1935 return 0; 1936 } 1937 1938 if (result < 0) 1939 return result; 1940 1941 priv->gc.label = "cp210x"; 1942 priv->gc.request = cp210x_gpio_request; 1943 priv->gc.get_direction = cp210x_gpio_direction_get; 1944 priv->gc.direction_input = cp210x_gpio_direction_input; 1945 priv->gc.direction_output = cp210x_gpio_direction_output; 1946 priv->gc.get = cp210x_gpio_get; 1947 priv->gc.set = cp210x_gpio_set; 1948 priv->gc.set_config = cp210x_gpio_set_config; 1949 priv->gc.owner = THIS_MODULE; 1950 priv->gc.parent = &serial->interface->dev; 1951 priv->gc.base = -1; 1952 priv->gc.can_sleep = true; 1953 1954 result = gpiochip_add_data(&priv->gc, serial); 1955 if (!result) 1956 priv->gpio_registered = true; 1957 1958 return result; 1959 } 1960 1961 static void cp210x_gpio_remove(struct usb_serial *serial) 1962 { 1963 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1964 1965 if (priv->gpio_registered) { 1966 gpiochip_remove(&priv->gc); 1967 priv->gpio_registered = false; 1968 } 1969 } 1970 1971 #else 1972 1973 static int cp210x_gpio_init(struct usb_serial *serial) 1974 { 1975 return 0; 1976 } 1977 1978 static void cp210x_gpio_remove(struct usb_serial *serial) 1979 { 1980 /* Nothing to do */ 1981 } 1982 1983 #endif 1984 1985 static int cp210x_port_probe(struct usb_serial_port *port) 1986 { 1987 struct usb_serial *serial = port->serial; 1988 struct cp210x_port_private *port_priv; 1989 int ret; 1990 1991 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 1992 if (!port_priv) 1993 return -ENOMEM; 1994 1995 port_priv->bInterfaceNumber = cp210x_interface_num(serial); 1996 1997 usb_set_serial_port_data(port, port_priv); 1998 1999 ret = cp210x_detect_swapped_line_ctl(port); 2000 if (ret) { 2001 kfree(port_priv); 2002 return ret; 2003 } 2004 2005 return 0; 2006 } 2007 2008 static int cp210x_port_remove(struct usb_serial_port *port) 2009 { 2010 struct cp210x_port_private *port_priv; 2011 2012 port_priv = usb_get_serial_port_data(port); 2013 kfree(port_priv); 2014 2015 return 0; 2016 } 2017 2018 static void cp210x_init_max_speed(struct usb_serial *serial) 2019 { 2020 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2021 bool use_actual_rate = false; 2022 speed_t min = 300; 2023 speed_t max; 2024 2025 switch (priv->partnum) { 2026 case CP210X_PARTNUM_CP2101: 2027 max = 921600; 2028 break; 2029 case CP210X_PARTNUM_CP2102: 2030 case CP210X_PARTNUM_CP2103: 2031 max = 1000000; 2032 break; 2033 case CP210X_PARTNUM_CP2104: 2034 use_actual_rate = true; 2035 max = 2000000; 2036 break; 2037 case CP210X_PARTNUM_CP2108: 2038 max = 2000000; 2039 break; 2040 case CP210X_PARTNUM_CP2105: 2041 if (cp210x_interface_num(serial) == 0) { 2042 use_actual_rate = true; 2043 max = 2000000; /* ECI */ 2044 } else { 2045 min = 2400; 2046 max = 921600; /* SCI */ 2047 } 2048 break; 2049 case CP210X_PARTNUM_CP2102N_QFN28: 2050 case CP210X_PARTNUM_CP2102N_QFN24: 2051 case CP210X_PARTNUM_CP2102N_QFN20: 2052 use_actual_rate = true; 2053 max = 3000000; 2054 break; 2055 default: 2056 max = 2000000; 2057 break; 2058 } 2059 2060 priv->min_speed = min; 2061 priv->max_speed = max; 2062 priv->use_actual_rate = use_actual_rate; 2063 } 2064 2065 static int cp210x_attach(struct usb_serial *serial) 2066 { 2067 int result; 2068 struct cp210x_serial_private *priv; 2069 2070 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 2071 if (!priv) 2072 return -ENOMEM; 2073 2074 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 2075 CP210X_GET_PARTNUM, &priv->partnum, 2076 sizeof(priv->partnum)); 2077 if (result < 0) { 2078 dev_warn(&serial->interface->dev, 2079 "querying part number failed\n"); 2080 priv->partnum = CP210X_PARTNUM_UNKNOWN; 2081 } 2082 2083 usb_set_serial_data(serial, priv); 2084 2085 cp210x_init_max_speed(serial); 2086 2087 result = cp210x_gpio_init(serial); 2088 if (result < 0) { 2089 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n", 2090 result); 2091 } 2092 2093 return 0; 2094 } 2095 2096 static void cp210x_disconnect(struct usb_serial *serial) 2097 { 2098 cp210x_gpio_remove(serial); 2099 } 2100 2101 static void cp210x_release(struct usb_serial *serial) 2102 { 2103 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2104 2105 cp210x_gpio_remove(serial); 2106 2107 kfree(priv); 2108 } 2109 2110 module_usb_serial_driver(serial_drivers, id_table); 2111 2112 MODULE_DESCRIPTION(DRIVER_DESC); 2113 MODULE_LICENSE("GPL v2"); 2114