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 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, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */ 129 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ 130 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ 131 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 132 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */ 133 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ 134 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */ 135 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */ 136 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */ 137 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */ 138 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ 139 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ 140 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */ 141 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 142 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 143 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */ 144 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */ 145 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */ 146 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */ 147 { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */ 148 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */ 149 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */ 150 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */ 151 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */ 152 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */ 153 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */ 154 { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */ 155 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */ 156 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */ 157 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */ 158 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 159 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 160 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */ 161 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 162 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 163 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */ 164 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */ 165 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 166 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 167 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 168 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 169 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 170 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 171 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */ 172 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */ 173 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 174 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 175 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */ 176 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */ 177 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */ 178 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 179 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */ 180 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */ 181 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */ 182 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */ 183 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */ 184 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */ 185 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 186 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ 187 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ 188 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ 189 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ 190 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ 191 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ 192 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 193 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 194 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 195 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */ 196 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */ 197 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */ 198 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */ 199 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */ 200 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */ 201 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */ 202 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */ 203 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */ 204 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */ 205 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */ 206 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */ 207 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 208 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */ 209 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 210 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 211 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 212 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 213 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 214 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 215 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 216 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 217 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 218 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 219 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 220 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 221 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 222 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 223 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 224 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 225 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 226 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 227 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 228 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 229 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 230 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */ 231 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 232 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 233 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 234 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */ 235 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 236 { } /* Terminating Entry */ 237 }; 238 239 MODULE_DEVICE_TABLE(usb, id_table); 240 241 struct cp210x_serial_private { 242 #ifdef CONFIG_GPIOLIB 243 struct gpio_chip gc; 244 bool gpio_registered; 245 u8 gpio_pushpull; 246 u8 gpio_altfunc; 247 u8 gpio_input; 248 #endif 249 u8 partnum; 250 speed_t min_speed; 251 speed_t max_speed; 252 bool use_actual_rate; 253 }; 254 255 struct cp210x_port_private { 256 __u8 bInterfaceNumber; 257 bool has_swapped_line_ctl; 258 }; 259 260 static struct usb_serial_driver cp210x_device = { 261 .driver = { 262 .owner = THIS_MODULE, 263 .name = "cp210x", 264 }, 265 .id_table = id_table, 266 .num_ports = 1, 267 .bulk_in_size = 256, 268 .bulk_out_size = 256, 269 .open = cp210x_open, 270 .close = cp210x_close, 271 .break_ctl = cp210x_break_ctl, 272 .set_termios = cp210x_set_termios, 273 .tx_empty = cp210x_tx_empty, 274 .tiocmget = cp210x_tiocmget, 275 .tiocmset = cp210x_tiocmset, 276 .attach = cp210x_attach, 277 .disconnect = cp210x_disconnect, 278 .release = cp210x_release, 279 .port_probe = cp210x_port_probe, 280 .port_remove = cp210x_port_remove, 281 .dtr_rts = cp210x_dtr_rts 282 }; 283 284 static struct usb_serial_driver * const serial_drivers[] = { 285 &cp210x_device, NULL 286 }; 287 288 /* Config request types */ 289 #define REQTYPE_HOST_TO_INTERFACE 0x41 290 #define REQTYPE_INTERFACE_TO_HOST 0xc1 291 #define REQTYPE_HOST_TO_DEVICE 0x40 292 #define REQTYPE_DEVICE_TO_HOST 0xc0 293 294 /* Config request codes */ 295 #define CP210X_IFC_ENABLE 0x00 296 #define CP210X_SET_BAUDDIV 0x01 297 #define CP210X_GET_BAUDDIV 0x02 298 #define CP210X_SET_LINE_CTL 0x03 299 #define CP210X_GET_LINE_CTL 0x04 300 #define CP210X_SET_BREAK 0x05 301 #define CP210X_IMM_CHAR 0x06 302 #define CP210X_SET_MHS 0x07 303 #define CP210X_GET_MDMSTS 0x08 304 #define CP210X_SET_XON 0x09 305 #define CP210X_SET_XOFF 0x0A 306 #define CP210X_SET_EVENTMASK 0x0B 307 #define CP210X_GET_EVENTMASK 0x0C 308 #define CP210X_SET_CHAR 0x0D 309 #define CP210X_GET_CHARS 0x0E 310 #define CP210X_GET_PROPS 0x0F 311 #define CP210X_GET_COMM_STATUS 0x10 312 #define CP210X_RESET 0x11 313 #define CP210X_PURGE 0x12 314 #define CP210X_SET_FLOW 0x13 315 #define CP210X_GET_FLOW 0x14 316 #define CP210X_EMBED_EVENTS 0x15 317 #define CP210X_GET_EVENTSTATE 0x16 318 #define CP210X_SET_CHARS 0x19 319 #define CP210X_GET_BAUDRATE 0x1D 320 #define CP210X_SET_BAUDRATE 0x1E 321 #define CP210X_VENDOR_SPECIFIC 0xFF 322 323 /* CP210X_IFC_ENABLE */ 324 #define UART_ENABLE 0x0001 325 #define UART_DISABLE 0x0000 326 327 /* CP210X_(SET|GET)_BAUDDIV */ 328 #define BAUD_RATE_GEN_FREQ 0x384000 329 330 /* CP210X_(SET|GET)_LINE_CTL */ 331 #define BITS_DATA_MASK 0X0f00 332 #define BITS_DATA_5 0X0500 333 #define BITS_DATA_6 0X0600 334 #define BITS_DATA_7 0X0700 335 #define BITS_DATA_8 0X0800 336 #define BITS_DATA_9 0X0900 337 338 #define BITS_PARITY_MASK 0x00f0 339 #define BITS_PARITY_NONE 0x0000 340 #define BITS_PARITY_ODD 0x0010 341 #define BITS_PARITY_EVEN 0x0020 342 #define BITS_PARITY_MARK 0x0030 343 #define BITS_PARITY_SPACE 0x0040 344 345 #define BITS_STOP_MASK 0x000f 346 #define BITS_STOP_1 0x0000 347 #define BITS_STOP_1_5 0x0001 348 #define BITS_STOP_2 0x0002 349 350 /* CP210X_SET_BREAK */ 351 #define BREAK_ON 0x0001 352 #define BREAK_OFF 0x0000 353 354 /* CP210X_(SET_MHS|GET_MDMSTS) */ 355 #define CONTROL_DTR 0x0001 356 #define CONTROL_RTS 0x0002 357 #define CONTROL_CTS 0x0010 358 #define CONTROL_DSR 0x0020 359 #define CONTROL_RING 0x0040 360 #define CONTROL_DCD 0x0080 361 #define CONTROL_WRITE_DTR 0x0100 362 #define CONTROL_WRITE_RTS 0x0200 363 364 /* CP210X_VENDOR_SPECIFIC values */ 365 #define CP210X_READ_2NCONFIG 0x000E 366 #define CP210X_READ_LATCH 0x00C2 367 #define CP210X_GET_PARTNUM 0x370B 368 #define CP210X_GET_PORTCONFIG 0x370C 369 #define CP210X_GET_DEVICEMODE 0x3711 370 #define CP210X_WRITE_LATCH 0x37E1 371 372 /* Part number definitions */ 373 #define CP210X_PARTNUM_CP2101 0x01 374 #define CP210X_PARTNUM_CP2102 0x02 375 #define CP210X_PARTNUM_CP2103 0x03 376 #define CP210X_PARTNUM_CP2104 0x04 377 #define CP210X_PARTNUM_CP2105 0x05 378 #define CP210X_PARTNUM_CP2108 0x08 379 #define CP210X_PARTNUM_CP2102N_QFN28 0x20 380 #define CP210X_PARTNUM_CP2102N_QFN24 0x21 381 #define CP210X_PARTNUM_CP2102N_QFN20 0x22 382 #define CP210X_PARTNUM_UNKNOWN 0xFF 383 384 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 385 struct cp210x_comm_status { 386 __le32 ulErrors; 387 __le32 ulHoldReasons; 388 __le32 ulAmountInInQueue; 389 __le32 ulAmountInOutQueue; 390 u8 bEofReceived; 391 u8 bWaitForImmediate; 392 u8 bReserved; 393 } __packed; 394 395 /* 396 * CP210X_PURGE - 16 bits passed in wValue of USB request. 397 * SiLabs app note AN571 gives a strange description of the 4 bits: 398 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 399 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 400 */ 401 #define PURGE_ALL 0x000f 402 403 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */ 404 struct cp210x_flow_ctl { 405 __le32 ulControlHandshake; 406 __le32 ulFlowReplace; 407 __le32 ulXonLimit; 408 __le32 ulXoffLimit; 409 } __packed; 410 411 /* cp210x_flow_ctl::ulControlHandshake */ 412 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0) 413 #define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode) 414 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3) 415 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4) 416 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5) 417 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6) 418 419 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */ 420 #define CP210X_SERIAL_DTR_INACTIVE 0 421 #define CP210X_SERIAL_DTR_ACTIVE 1 422 #define CP210X_SERIAL_DTR_FLOW_CTL 2 423 424 /* cp210x_flow_ctl::ulFlowReplace */ 425 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0) 426 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1) 427 #define CP210X_SERIAL_ERROR_CHAR BIT(2) 428 #define CP210X_SERIAL_NULL_STRIPPING BIT(3) 429 #define CP210X_SERIAL_BREAK_CHAR BIT(4) 430 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6) 431 #define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6) 432 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31) 433 434 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */ 435 #define CP210X_SERIAL_RTS_INACTIVE 0 436 #define CP210X_SERIAL_RTS_ACTIVE 1 437 #define CP210X_SERIAL_RTS_FLOW_CTL 2 438 439 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */ 440 struct cp210x_pin_mode { 441 u8 eci; 442 u8 sci; 443 } __packed; 444 445 #define CP210X_PIN_MODE_MODEM 0 446 #define CP210X_PIN_MODE_GPIO BIT(0) 447 448 /* 449 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes 450 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes. 451 */ 452 struct cp210x_dual_port_config { 453 __le16 gpio_mode; 454 u8 __pad0[2]; 455 __le16 reset_state; 456 u8 __pad1[4]; 457 __le16 suspend_state; 458 u8 sci_cfg; 459 u8 eci_cfg; 460 u8 device_cfg; 461 } __packed; 462 463 /* 464 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes 465 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes. 466 */ 467 struct cp210x_single_port_config { 468 __le16 gpio_mode; 469 u8 __pad0[2]; 470 __le16 reset_state; 471 u8 __pad1[4]; 472 __le16 suspend_state; 473 u8 device_cfg; 474 } __packed; 475 476 /* GPIO modes */ 477 #define CP210X_SCI_GPIO_MODE_OFFSET 9 478 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9) 479 480 #define CP210X_ECI_GPIO_MODE_OFFSET 2 481 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2) 482 483 #define CP210X_GPIO_MODE_OFFSET 8 484 #define CP210X_GPIO_MODE_MASK GENMASK(11, 8) 485 486 /* CP2105 port configuration values */ 487 #define CP2105_GPIO0_TXLED_MODE BIT(0) 488 #define CP2105_GPIO1_RXLED_MODE BIT(1) 489 #define CP2105_GPIO1_RS485_MODE BIT(2) 490 491 /* CP2104 port configuration values */ 492 #define CP2104_GPIO0_TXLED_MODE BIT(0) 493 #define CP2104_GPIO1_RXLED_MODE BIT(1) 494 #define CP2104_GPIO2_RS485_MODE BIT(2) 495 496 /* CP2102N configuration array indices */ 497 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2 498 #define CP210X_2NCONFIG_GPIO_MODE_IDX 581 499 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587 500 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600 501 502 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */ 503 struct cp210x_gpio_write { 504 u8 mask; 505 u8 state; 506 } __packed; 507 508 /* 509 * Helper to get interface number when we only have struct usb_serial. 510 */ 511 static u8 cp210x_interface_num(struct usb_serial *serial) 512 { 513 struct usb_host_interface *cur_altsetting; 514 515 cur_altsetting = serial->interface->cur_altsetting; 516 517 return cur_altsetting->desc.bInterfaceNumber; 518 } 519 520 /* 521 * Reads a variable-sized block of CP210X_ registers, identified by req. 522 * Returns data into buf in native USB byte order. 523 */ 524 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, 525 void *buf, int bufsize) 526 { 527 struct usb_serial *serial = port->serial; 528 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 529 void *dmabuf; 530 int result; 531 532 dmabuf = kmalloc(bufsize, GFP_KERNEL); 533 if (!dmabuf) { 534 /* 535 * FIXME Some callers don't bother to check for error, 536 * at least give them consistent junk until they are fixed 537 */ 538 memset(buf, 0, bufsize); 539 return -ENOMEM; 540 } 541 542 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 543 req, REQTYPE_INTERFACE_TO_HOST, 0, 544 port_priv->bInterfaceNumber, dmabuf, bufsize, 545 USB_CTRL_SET_TIMEOUT); 546 if (result == bufsize) { 547 memcpy(buf, dmabuf, bufsize); 548 result = 0; 549 } else { 550 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", 551 req, bufsize, result); 552 if (result >= 0) 553 result = -EIO; 554 555 /* 556 * FIXME Some callers don't bother to check for error, 557 * at least give them consistent junk until they are fixed 558 */ 559 memset(buf, 0, bufsize); 560 } 561 562 kfree(dmabuf); 563 564 return result; 565 } 566 567 /* 568 * Reads any 32-bit CP210X_ register identified by req. 569 */ 570 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val) 571 { 572 __le32 le32_val; 573 int err; 574 575 err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val)); 576 if (err) { 577 /* 578 * FIXME Some callers don't bother to check for error, 579 * at least give them consistent junk until they are fixed 580 */ 581 *val = 0; 582 return err; 583 } 584 585 *val = le32_to_cpu(le32_val); 586 587 return 0; 588 } 589 590 /* 591 * Reads any 16-bit CP210X_ register identified by req. 592 */ 593 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val) 594 { 595 __le16 le16_val; 596 int err; 597 598 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val)); 599 if (err) 600 return err; 601 602 *val = le16_to_cpu(le16_val); 603 604 return 0; 605 } 606 607 /* 608 * Reads any 8-bit CP210X_ register identified by req. 609 */ 610 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val) 611 { 612 return cp210x_read_reg_block(port, req, val, sizeof(*val)); 613 } 614 615 /* 616 * Reads a variable-sized vendor block of CP210X_ registers, identified by val. 617 * Returns data into buf in native USB byte order. 618 */ 619 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val, 620 void *buf, int bufsize) 621 { 622 void *dmabuf; 623 int result; 624 625 dmabuf = kmalloc(bufsize, GFP_KERNEL); 626 if (!dmabuf) 627 return -ENOMEM; 628 629 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 630 CP210X_VENDOR_SPECIFIC, type, val, 631 cp210x_interface_num(serial), dmabuf, bufsize, 632 USB_CTRL_GET_TIMEOUT); 633 if (result == bufsize) { 634 memcpy(buf, dmabuf, bufsize); 635 result = 0; 636 } else { 637 dev_err(&serial->interface->dev, 638 "failed to get vendor val 0x%04x size %d: %d\n", val, 639 bufsize, result); 640 if (result >= 0) 641 result = -EIO; 642 } 643 644 kfree(dmabuf); 645 646 return result; 647 } 648 649 /* 650 * Writes any 16-bit CP210X_ register (req) whose value is passed 651 * entirely in the wValue field of the USB request. 652 */ 653 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) 654 { 655 struct usb_serial *serial = port->serial; 656 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 657 int result; 658 659 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 660 req, REQTYPE_HOST_TO_INTERFACE, val, 661 port_priv->bInterfaceNumber, NULL, 0, 662 USB_CTRL_SET_TIMEOUT); 663 if (result < 0) { 664 dev_err(&port->dev, "failed set request 0x%x status: %d\n", 665 req, result); 666 } 667 668 return result; 669 } 670 671 /* 672 * Writes a variable-sized block of CP210X_ registers, identified by req. 673 * Data in buf must be in native USB byte order. 674 */ 675 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req, 676 void *buf, int bufsize) 677 { 678 struct usb_serial *serial = port->serial; 679 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 680 void *dmabuf; 681 int result; 682 683 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 684 if (!dmabuf) 685 return -ENOMEM; 686 687 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 688 req, REQTYPE_HOST_TO_INTERFACE, 0, 689 port_priv->bInterfaceNumber, dmabuf, bufsize, 690 USB_CTRL_SET_TIMEOUT); 691 692 kfree(dmabuf); 693 694 if (result == bufsize) { 695 result = 0; 696 } else { 697 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", 698 req, bufsize, result); 699 if (result >= 0) 700 result = -EIO; 701 } 702 703 return result; 704 } 705 706 /* 707 * Writes any 32-bit CP210X_ register identified by req. 708 */ 709 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) 710 { 711 __le32 le32_val; 712 713 le32_val = cpu_to_le32(val); 714 715 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); 716 } 717 718 #ifdef CONFIG_GPIOLIB 719 /* 720 * Writes a variable-sized vendor block of CP210X_ registers, identified by val. 721 * Data in buf must be in native USB byte order. 722 */ 723 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type, 724 u16 val, void *buf, int bufsize) 725 { 726 void *dmabuf; 727 int result; 728 729 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 730 if (!dmabuf) 731 return -ENOMEM; 732 733 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 734 CP210X_VENDOR_SPECIFIC, type, val, 735 cp210x_interface_num(serial), dmabuf, bufsize, 736 USB_CTRL_SET_TIMEOUT); 737 738 kfree(dmabuf); 739 740 if (result == bufsize) { 741 result = 0; 742 } else { 743 dev_err(&serial->interface->dev, 744 "failed to set vendor val 0x%04x size %d: %d\n", val, 745 bufsize, result); 746 if (result >= 0) 747 result = -EIO; 748 } 749 750 return result; 751 } 752 #endif 753 754 /* 755 * Detect CP2108 GET_LINE_CTL bug and activate workaround. 756 * Write a known good value 0x800, read it back. 757 * If it comes back swapped the bug is detected. 758 * Preserve the original register value. 759 */ 760 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port) 761 { 762 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 763 u16 line_ctl_save; 764 u16 line_ctl_test; 765 int err; 766 767 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save); 768 if (err) 769 return err; 770 771 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800); 772 if (err) 773 return err; 774 775 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test); 776 if (err) 777 return err; 778 779 if (line_ctl_test == 8) { 780 port_priv->has_swapped_line_ctl = true; 781 line_ctl_save = swab16(line_ctl_save); 782 } 783 784 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save); 785 } 786 787 /* 788 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL) 789 * to workaround cp2108 bug and get correct value. 790 */ 791 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl) 792 { 793 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 794 int err; 795 796 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl); 797 if (err) 798 return err; 799 800 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */ 801 if (port_priv->has_swapped_line_ctl) 802 *ctl = swab16(*ctl); 803 804 return 0; 805 } 806 807 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 808 { 809 int result; 810 811 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 812 if (result) { 813 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 814 return result; 815 } 816 817 /* Configure the termios structure */ 818 cp210x_get_termios(tty, port); 819 820 /* The baud rate must be initialised on cp2104 */ 821 if (tty) 822 cp210x_change_speed(tty, port, NULL); 823 824 return usb_serial_generic_open(tty, port); 825 } 826 827 static void cp210x_close(struct usb_serial_port *port) 828 { 829 usb_serial_generic_close(port); 830 831 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 832 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 833 834 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 835 } 836 837 /* 838 * Read how many bytes are waiting in the TX queue. 839 */ 840 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 841 u32 *count) 842 { 843 struct usb_serial *serial = port->serial; 844 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 845 struct cp210x_comm_status *sts; 846 int result; 847 848 sts = kmalloc(sizeof(*sts), GFP_KERNEL); 849 if (!sts) 850 return -ENOMEM; 851 852 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 853 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST, 854 0, port_priv->bInterfaceNumber, sts, sizeof(*sts), 855 USB_CTRL_GET_TIMEOUT); 856 if (result == sizeof(*sts)) { 857 *count = le32_to_cpu(sts->ulAmountInOutQueue); 858 result = 0; 859 } else { 860 dev_err(&port->dev, "failed to get comm status: %d\n", result); 861 if (result >= 0) 862 result = -EIO; 863 } 864 865 kfree(sts); 866 867 return result; 868 } 869 870 static bool cp210x_tx_empty(struct usb_serial_port *port) 871 { 872 int err; 873 u32 count; 874 875 err = cp210x_get_tx_queue_byte_count(port, &count); 876 if (err) 877 return true; 878 879 return !count; 880 } 881 882 /* 883 * cp210x_get_termios 884 * Reads the baud rate, data bits, parity, stop bits and flow control mode 885 * from the device, corrects any unsupported values, and configures the 886 * termios structure to reflect the state of the device 887 */ 888 static void cp210x_get_termios(struct tty_struct *tty, 889 struct usb_serial_port *port) 890 { 891 unsigned int baud; 892 893 if (tty) { 894 cp210x_get_termios_port(tty->driver_data, 895 &tty->termios.c_cflag, &baud); 896 tty_encode_baud_rate(tty, baud, baud); 897 } else { 898 tcflag_t cflag; 899 cflag = 0; 900 cp210x_get_termios_port(port, &cflag, &baud); 901 } 902 } 903 904 /* 905 * cp210x_get_termios_port 906 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port. 907 */ 908 static void cp210x_get_termios_port(struct usb_serial_port *port, 909 tcflag_t *cflagp, unsigned int *baudp) 910 { 911 struct device *dev = &port->dev; 912 tcflag_t cflag; 913 struct cp210x_flow_ctl flow_ctl; 914 u32 baud; 915 u16 bits; 916 u32 ctl_hs; 917 918 cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud); 919 920 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud); 921 *baudp = baud; 922 923 cflag = *cflagp; 924 925 cp210x_get_line_ctl(port, &bits); 926 cflag &= ~CSIZE; 927 switch (bits & BITS_DATA_MASK) { 928 case BITS_DATA_5: 929 dev_dbg(dev, "%s - data bits = 5\n", __func__); 930 cflag |= CS5; 931 break; 932 case BITS_DATA_6: 933 dev_dbg(dev, "%s - data bits = 6\n", __func__); 934 cflag |= CS6; 935 break; 936 case BITS_DATA_7: 937 dev_dbg(dev, "%s - data bits = 7\n", __func__); 938 cflag |= CS7; 939 break; 940 case BITS_DATA_8: 941 dev_dbg(dev, "%s - data bits = 8\n", __func__); 942 cflag |= CS8; 943 break; 944 case BITS_DATA_9: 945 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__); 946 cflag |= CS8; 947 bits &= ~BITS_DATA_MASK; 948 bits |= BITS_DATA_8; 949 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 950 break; 951 default: 952 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__); 953 cflag |= CS8; 954 bits &= ~BITS_DATA_MASK; 955 bits |= BITS_DATA_8; 956 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 957 break; 958 } 959 960 switch (bits & BITS_PARITY_MASK) { 961 case BITS_PARITY_NONE: 962 dev_dbg(dev, "%s - parity = NONE\n", __func__); 963 cflag &= ~PARENB; 964 break; 965 case BITS_PARITY_ODD: 966 dev_dbg(dev, "%s - parity = ODD\n", __func__); 967 cflag |= (PARENB|PARODD); 968 break; 969 case BITS_PARITY_EVEN: 970 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 971 cflag &= ~PARODD; 972 cflag |= PARENB; 973 break; 974 case BITS_PARITY_MARK: 975 dev_dbg(dev, "%s - parity = MARK\n", __func__); 976 cflag |= (PARENB|PARODD|CMSPAR); 977 break; 978 case BITS_PARITY_SPACE: 979 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 980 cflag &= ~PARODD; 981 cflag |= (PARENB|CMSPAR); 982 break; 983 default: 984 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__); 985 cflag &= ~PARENB; 986 bits &= ~BITS_PARITY_MASK; 987 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 988 break; 989 } 990 991 cflag &= ~CSTOPB; 992 switch (bits & BITS_STOP_MASK) { 993 case BITS_STOP_1: 994 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 995 break; 996 case BITS_STOP_1_5: 997 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__); 998 bits &= ~BITS_STOP_MASK; 999 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1000 break; 1001 case BITS_STOP_2: 1002 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 1003 cflag |= CSTOPB; 1004 break; 1005 default: 1006 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__); 1007 bits &= ~BITS_STOP_MASK; 1008 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1009 break; 1010 } 1011 1012 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1013 sizeof(flow_ctl)); 1014 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1015 if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) { 1016 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 1017 cflag |= CRTSCTS; 1018 } else { 1019 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 1020 cflag &= ~CRTSCTS; 1021 } 1022 1023 *cflagp = cflag; 1024 } 1025 1026 struct cp210x_rate { 1027 speed_t rate; 1028 speed_t high; 1029 }; 1030 1031 static const struct cp210x_rate cp210x_an205_table1[] = { 1032 { 300, 300 }, 1033 { 600, 600 }, 1034 { 1200, 1200 }, 1035 { 1800, 1800 }, 1036 { 2400, 2400 }, 1037 { 4000, 4000 }, 1038 { 4800, 4803 }, 1039 { 7200, 7207 }, 1040 { 9600, 9612 }, 1041 { 14400, 14428 }, 1042 { 16000, 16062 }, 1043 { 19200, 19250 }, 1044 { 28800, 28912 }, 1045 { 38400, 38601 }, 1046 { 51200, 51558 }, 1047 { 56000, 56280 }, 1048 { 57600, 58053 }, 1049 { 64000, 64111 }, 1050 { 76800, 77608 }, 1051 { 115200, 117028 }, 1052 { 128000, 129347 }, 1053 { 153600, 156868 }, 1054 { 230400, 237832 }, 1055 { 250000, 254234 }, 1056 { 256000, 273066 }, 1057 { 460800, 491520 }, 1058 { 500000, 567138 }, 1059 { 576000, 670254 }, 1060 { 921600, UINT_MAX } 1061 }; 1062 1063 /* 1064 * Quantises the baud rate as per AN205 Table 1 1065 */ 1066 static speed_t cp210x_get_an205_rate(speed_t baud) 1067 { 1068 int i; 1069 1070 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) { 1071 if (baud <= cp210x_an205_table1[i].high) 1072 break; 1073 } 1074 1075 return cp210x_an205_table1[i].rate; 1076 } 1077 1078 static speed_t cp210x_get_actual_rate(speed_t baud) 1079 { 1080 unsigned int prescale = 1; 1081 unsigned int div; 1082 1083 if (baud <= 365) 1084 prescale = 4; 1085 1086 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud); 1087 baud = 48000000 / (2 * prescale * div); 1088 1089 return baud; 1090 } 1091 1092 /* 1093 * CP2101 supports the following baud rates: 1094 * 1095 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 1096 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 1097 * 1098 * CP2102 and CP2103 support the following additional rates: 1099 * 1100 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 1101 * 576000 1102 * 1103 * The device will map a requested rate to a supported one, but the result 1104 * of requests for rates greater than 1053257 is undefined (see AN205). 1105 * 1106 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 1107 * respectively, with an error less than 1%. The actual rates are determined 1108 * by 1109 * 1110 * div = round(freq / (2 x prescale x request)) 1111 * actual = freq / (2 x prescale x div) 1112 * 1113 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 1114 * or 1 otherwise. 1115 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 1116 * otherwise. 1117 */ 1118 static void cp210x_change_speed(struct tty_struct *tty, 1119 struct usb_serial_port *port, struct ktermios *old_termios) 1120 { 1121 struct usb_serial *serial = port->serial; 1122 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1123 u32 baud; 1124 1125 /* 1126 * This maps the requested rate to the actual rate, a valid rate on 1127 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed]. 1128 * 1129 * NOTE: B0 is not implemented. 1130 */ 1131 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed); 1132 1133 if (priv->use_actual_rate) 1134 baud = cp210x_get_actual_rate(baud); 1135 else if (baud < 1000000) 1136 baud = cp210x_get_an205_rate(baud); 1137 1138 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 1139 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { 1140 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 1141 if (old_termios) 1142 baud = old_termios->c_ospeed; 1143 else 1144 baud = 9600; 1145 } 1146 1147 tty_encode_baud_rate(tty, baud, baud); 1148 } 1149 1150 static void cp210x_set_termios(struct tty_struct *tty, 1151 struct usb_serial_port *port, struct ktermios *old_termios) 1152 { 1153 struct device *dev = &port->dev; 1154 unsigned int cflag, old_cflag; 1155 u16 bits; 1156 1157 cflag = tty->termios.c_cflag; 1158 old_cflag = old_termios->c_cflag; 1159 1160 if (tty->termios.c_ospeed != old_termios->c_ospeed) 1161 cp210x_change_speed(tty, port, old_termios); 1162 1163 /* If the number of data bits is to be updated */ 1164 if ((cflag & CSIZE) != (old_cflag & CSIZE)) { 1165 cp210x_get_line_ctl(port, &bits); 1166 bits &= ~BITS_DATA_MASK; 1167 switch (cflag & CSIZE) { 1168 case CS5: 1169 bits |= BITS_DATA_5; 1170 dev_dbg(dev, "%s - data bits = 5\n", __func__); 1171 break; 1172 case CS6: 1173 bits |= BITS_DATA_6; 1174 dev_dbg(dev, "%s - data bits = 6\n", __func__); 1175 break; 1176 case CS7: 1177 bits |= BITS_DATA_7; 1178 dev_dbg(dev, "%s - data bits = 7\n", __func__); 1179 break; 1180 case CS8: 1181 default: 1182 bits |= BITS_DATA_8; 1183 dev_dbg(dev, "%s - data bits = 8\n", __func__); 1184 break; 1185 } 1186 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 1187 dev_dbg(dev, "Number of data bits requested not supported by device\n"); 1188 } 1189 1190 if ((cflag & (PARENB|PARODD|CMSPAR)) != 1191 (old_cflag & (PARENB|PARODD|CMSPAR))) { 1192 cp210x_get_line_ctl(port, &bits); 1193 bits &= ~BITS_PARITY_MASK; 1194 if (cflag & PARENB) { 1195 if (cflag & CMSPAR) { 1196 if (cflag & PARODD) { 1197 bits |= BITS_PARITY_MARK; 1198 dev_dbg(dev, "%s - parity = MARK\n", __func__); 1199 } else { 1200 bits |= BITS_PARITY_SPACE; 1201 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 1202 } 1203 } else { 1204 if (cflag & PARODD) { 1205 bits |= BITS_PARITY_ODD; 1206 dev_dbg(dev, "%s - parity = ODD\n", __func__); 1207 } else { 1208 bits |= BITS_PARITY_EVEN; 1209 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 1210 } 1211 } 1212 } 1213 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 1214 dev_dbg(dev, "Parity mode not supported by device\n"); 1215 } 1216 1217 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { 1218 cp210x_get_line_ctl(port, &bits); 1219 bits &= ~BITS_STOP_MASK; 1220 if (cflag & CSTOPB) { 1221 bits |= BITS_STOP_2; 1222 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 1223 } else { 1224 bits |= BITS_STOP_1; 1225 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 1226 } 1227 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 1228 dev_dbg(dev, "Number of stop bits requested not supported by device\n"); 1229 } 1230 1231 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 1232 struct cp210x_flow_ctl flow_ctl; 1233 u32 ctl_hs; 1234 u32 flow_repl; 1235 1236 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1237 sizeof(flow_ctl)); 1238 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1239 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1240 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n", 1241 __func__, ctl_hs, flow_repl); 1242 1243 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE; 1244 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE; 1245 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY; 1246 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1247 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE); 1248 if (cflag & CRTSCTS) { 1249 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE; 1250 1251 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1252 flow_repl |= CP210X_SERIAL_RTS_SHIFT( 1253 CP210X_SERIAL_RTS_FLOW_CTL); 1254 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 1255 } else { 1256 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE; 1257 1258 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1259 flow_repl |= CP210X_SERIAL_RTS_SHIFT( 1260 CP210X_SERIAL_RTS_ACTIVE); 1261 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 1262 } 1263 1264 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n", 1265 __func__, ctl_hs, flow_repl); 1266 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1267 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1268 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1269 sizeof(flow_ctl)); 1270 } 1271 1272 } 1273 1274 static int cp210x_tiocmset(struct tty_struct *tty, 1275 unsigned int set, unsigned int clear) 1276 { 1277 struct usb_serial_port *port = tty->driver_data; 1278 return cp210x_tiocmset_port(port, set, clear); 1279 } 1280 1281 static int cp210x_tiocmset_port(struct usb_serial_port *port, 1282 unsigned int set, unsigned int clear) 1283 { 1284 u16 control = 0; 1285 1286 if (set & TIOCM_RTS) { 1287 control |= CONTROL_RTS; 1288 control |= CONTROL_WRITE_RTS; 1289 } 1290 if (set & TIOCM_DTR) { 1291 control |= CONTROL_DTR; 1292 control |= CONTROL_WRITE_DTR; 1293 } 1294 if (clear & TIOCM_RTS) { 1295 control &= ~CONTROL_RTS; 1296 control |= CONTROL_WRITE_RTS; 1297 } 1298 if (clear & TIOCM_DTR) { 1299 control &= ~CONTROL_DTR; 1300 control |= CONTROL_WRITE_DTR; 1301 } 1302 1303 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control); 1304 1305 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1306 } 1307 1308 static void cp210x_dtr_rts(struct usb_serial_port *p, int on) 1309 { 1310 if (on) 1311 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0); 1312 else 1313 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS); 1314 } 1315 1316 static int cp210x_tiocmget(struct tty_struct *tty) 1317 { 1318 struct usb_serial_port *port = tty->driver_data; 1319 u8 control; 1320 int result; 1321 1322 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1323 if (result) 1324 return result; 1325 1326 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1327 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1328 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1329 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1330 |((control & CONTROL_RING)? TIOCM_RI : 0) 1331 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1332 1333 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control); 1334 1335 return result; 1336 } 1337 1338 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 1339 { 1340 struct usb_serial_port *port = tty->driver_data; 1341 u16 state; 1342 1343 if (break_state == 0) 1344 state = BREAK_OFF; 1345 else 1346 state = BREAK_ON; 1347 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1348 state == BREAK_OFF ? "off" : "on"); 1349 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1350 } 1351 1352 #ifdef CONFIG_GPIOLIB 1353 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset) 1354 { 1355 struct usb_serial *serial = gpiochip_get_data(gc); 1356 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1357 1358 if (priv->gpio_altfunc & BIT(offset)) 1359 return -ENODEV; 1360 1361 return 0; 1362 } 1363 1364 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio) 1365 { 1366 struct usb_serial *serial = gpiochip_get_data(gc); 1367 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1368 u8 req_type = REQTYPE_DEVICE_TO_HOST; 1369 int result; 1370 u8 buf; 1371 1372 if (priv->partnum == CP210X_PARTNUM_CP2105) 1373 req_type = REQTYPE_INTERFACE_TO_HOST; 1374 1375 result = usb_autopm_get_interface(serial->interface); 1376 if (result) 1377 return result; 1378 1379 result = cp210x_read_vendor_block(serial, req_type, 1380 CP210X_READ_LATCH, &buf, sizeof(buf)); 1381 usb_autopm_put_interface(serial->interface); 1382 if (result < 0) 1383 return result; 1384 1385 return !!(buf & BIT(gpio)); 1386 } 1387 1388 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value) 1389 { 1390 struct usb_serial *serial = gpiochip_get_data(gc); 1391 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1392 struct cp210x_gpio_write buf; 1393 int result; 1394 1395 if (value == 1) 1396 buf.state = BIT(gpio); 1397 else 1398 buf.state = 0; 1399 1400 buf.mask = BIT(gpio); 1401 1402 result = usb_autopm_get_interface(serial->interface); 1403 if (result) 1404 goto out; 1405 1406 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1407 result = cp210x_write_vendor_block(serial, 1408 REQTYPE_HOST_TO_INTERFACE, 1409 CP210X_WRITE_LATCH, &buf, 1410 sizeof(buf)); 1411 } else { 1412 u16 wIndex = buf.state << 8 | buf.mask; 1413 1414 result = usb_control_msg(serial->dev, 1415 usb_sndctrlpipe(serial->dev, 0), 1416 CP210X_VENDOR_SPECIFIC, 1417 REQTYPE_HOST_TO_DEVICE, 1418 CP210X_WRITE_LATCH, 1419 wIndex, 1420 NULL, 0, USB_CTRL_SET_TIMEOUT); 1421 } 1422 1423 usb_autopm_put_interface(serial->interface); 1424 out: 1425 if (result < 0) { 1426 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n", 1427 result); 1428 } 1429 } 1430 1431 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio) 1432 { 1433 struct usb_serial *serial = gpiochip_get_data(gc); 1434 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1435 1436 return priv->gpio_input & BIT(gpio); 1437 } 1438 1439 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio) 1440 { 1441 struct usb_serial *serial = gpiochip_get_data(gc); 1442 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1443 1444 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1445 /* hardware does not support an input mode */ 1446 return -ENOTSUPP; 1447 } 1448 1449 /* push-pull pins cannot be changed to be inputs */ 1450 if (priv->gpio_pushpull & BIT(gpio)) 1451 return -EINVAL; 1452 1453 /* make sure to release pin if it is being driven low */ 1454 cp210x_gpio_set(gc, gpio, 1); 1455 1456 priv->gpio_input |= BIT(gpio); 1457 1458 return 0; 1459 } 1460 1461 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio, 1462 int value) 1463 { 1464 struct usb_serial *serial = gpiochip_get_data(gc); 1465 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1466 1467 priv->gpio_input &= ~BIT(gpio); 1468 cp210x_gpio_set(gc, gpio, value); 1469 1470 return 0; 1471 } 1472 1473 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio, 1474 unsigned long config) 1475 { 1476 struct usb_serial *serial = gpiochip_get_data(gc); 1477 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1478 enum pin_config_param param = pinconf_to_config_param(config); 1479 1480 /* Succeed only if in correct mode (this can't be set at runtime) */ 1481 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) && 1482 (priv->gpio_pushpull & BIT(gpio))) 1483 return 0; 1484 1485 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) && 1486 !(priv->gpio_pushpull & BIT(gpio))) 1487 return 0; 1488 1489 return -ENOTSUPP; 1490 } 1491 1492 /* 1493 * This function is for configuring GPIO using shared pins, where other signals 1494 * are made unavailable by configuring the use of GPIO. This is believed to be 1495 * only applicable to the cp2105 at this point, the other devices supported by 1496 * this driver that provide GPIO do so in a way that does not impact other 1497 * signals and are thus expected to have very different initialisation. 1498 */ 1499 static int cp2105_gpioconf_init(struct usb_serial *serial) 1500 { 1501 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1502 struct cp210x_pin_mode mode; 1503 struct cp210x_dual_port_config config; 1504 u8 intf_num = cp210x_interface_num(serial); 1505 u8 iface_config; 1506 int result; 1507 1508 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1509 CP210X_GET_DEVICEMODE, &mode, 1510 sizeof(mode)); 1511 if (result < 0) 1512 return result; 1513 1514 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1515 CP210X_GET_PORTCONFIG, &config, 1516 sizeof(config)); 1517 if (result < 0) 1518 return result; 1519 1520 /* 2 banks of GPIO - One for the pins taken from each serial port */ 1521 if (intf_num == 0) { 1522 if (mode.eci == CP210X_PIN_MODE_MODEM) { 1523 /* mark all GPIOs of this interface as reserved */ 1524 priv->gpio_altfunc = 0xff; 1525 return 0; 1526 } 1527 1528 iface_config = config.eci_cfg; 1529 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1530 CP210X_ECI_GPIO_MODE_MASK) >> 1531 CP210X_ECI_GPIO_MODE_OFFSET); 1532 priv->gc.ngpio = 2; 1533 } else if (intf_num == 1) { 1534 if (mode.sci == CP210X_PIN_MODE_MODEM) { 1535 /* mark all GPIOs of this interface as reserved */ 1536 priv->gpio_altfunc = 0xff; 1537 return 0; 1538 } 1539 1540 iface_config = config.sci_cfg; 1541 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1542 CP210X_SCI_GPIO_MODE_MASK) >> 1543 CP210X_SCI_GPIO_MODE_OFFSET); 1544 priv->gc.ngpio = 3; 1545 } else { 1546 return -ENODEV; 1547 } 1548 1549 /* mark all pins which are not in GPIO mode */ 1550 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */ 1551 priv->gpio_altfunc |= BIT(0); 1552 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */ 1553 CP2105_GPIO1_RS485_MODE)) 1554 priv->gpio_altfunc |= BIT(1); 1555 1556 /* driver implementation for CP2105 only supports outputs */ 1557 priv->gpio_input = 0; 1558 1559 return 0; 1560 } 1561 1562 static int cp2104_gpioconf_init(struct usb_serial *serial) 1563 { 1564 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1565 struct cp210x_single_port_config config; 1566 u8 iface_config; 1567 u8 gpio_latch; 1568 int result; 1569 u8 i; 1570 1571 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1572 CP210X_GET_PORTCONFIG, &config, 1573 sizeof(config)); 1574 if (result < 0) 1575 return result; 1576 1577 priv->gc.ngpio = 4; 1578 1579 iface_config = config.device_cfg; 1580 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1581 CP210X_GPIO_MODE_MASK) >> 1582 CP210X_GPIO_MODE_OFFSET); 1583 gpio_latch = (u8)((le16_to_cpu(config.reset_state) & 1584 CP210X_GPIO_MODE_MASK) >> 1585 CP210X_GPIO_MODE_OFFSET); 1586 1587 /* mark all pins which are not in GPIO mode */ 1588 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */ 1589 priv->gpio_altfunc |= BIT(0); 1590 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */ 1591 priv->gpio_altfunc |= BIT(1); 1592 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */ 1593 priv->gpio_altfunc |= BIT(2); 1594 1595 /* 1596 * Like CP2102N, CP2104 has also no strict input and output pin 1597 * modes. 1598 * Do the same input mode emulation as CP2102N. 1599 */ 1600 for (i = 0; i < priv->gc.ngpio; ++i) { 1601 /* 1602 * Set direction to "input" iff pin is open-drain and reset 1603 * value is 1. 1604 */ 1605 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1606 priv->gpio_input |= BIT(i); 1607 } 1608 1609 return 0; 1610 } 1611 1612 static int cp2102n_gpioconf_init(struct usb_serial *serial) 1613 { 1614 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1615 const u16 config_size = 0x02a6; 1616 u8 gpio_rst_latch; 1617 u8 config_version; 1618 u8 gpio_pushpull; 1619 u8 *config_buf; 1620 u8 gpio_latch; 1621 u8 gpio_ctrl; 1622 int result; 1623 u8 i; 1624 1625 /* 1626 * Retrieve device configuration from the device. 1627 * The array received contains all customization settings done at the 1628 * factory/manufacturer. Format of the array is documented at the 1629 * time of writing at: 1630 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa 1631 */ 1632 config_buf = kmalloc(config_size, GFP_KERNEL); 1633 if (!config_buf) 1634 return -ENOMEM; 1635 1636 result = cp210x_read_vendor_block(serial, 1637 REQTYPE_DEVICE_TO_HOST, 1638 CP210X_READ_2NCONFIG, 1639 config_buf, 1640 config_size); 1641 if (result < 0) { 1642 kfree(config_buf); 1643 return result; 1644 } 1645 1646 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX]; 1647 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX]; 1648 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX]; 1649 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX]; 1650 1651 kfree(config_buf); 1652 1653 /* Make sure this is a config format we understand. */ 1654 if (config_version != 0x01) 1655 return -ENOTSUPP; 1656 1657 priv->gc.ngpio = 4; 1658 1659 /* 1660 * Get default pin states after reset. Needed so we can determine 1661 * the direction of an open-drain pin. 1662 */ 1663 gpio_latch = (gpio_rst_latch >> 3) & 0x0f; 1664 1665 /* 0 indicates open-drain mode, 1 is push-pull */ 1666 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f; 1667 1668 /* 0 indicates GPIO mode, 1 is alternate function */ 1669 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f; 1670 1671 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) { 1672 /* 1673 * For the QFN28 package, GPIO4-6 are controlled by 1674 * the low three bits of the mode/latch fields. 1675 * Contrary to the document linked above, the bits for 1676 * the SUSPEND pins are elsewhere. No alternate 1677 * function is available for these pins. 1678 */ 1679 priv->gc.ngpio = 7; 1680 gpio_latch |= (gpio_rst_latch & 7) << 4; 1681 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4; 1682 } 1683 1684 /* 1685 * The CP2102N does not strictly has input and output pin modes, 1686 * it only knows open-drain and push-pull modes which is set at 1687 * factory. An open-drain pin can function both as an 1688 * input or an output. We emulate input mode for open-drain pins 1689 * by making sure they are not driven low, and we do not allow 1690 * push-pull pins to be set as an input. 1691 */ 1692 for (i = 0; i < priv->gc.ngpio; ++i) { 1693 /* 1694 * Set direction to "input" iff pin is open-drain and reset 1695 * value is 1. 1696 */ 1697 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1698 priv->gpio_input |= BIT(i); 1699 } 1700 1701 return 0; 1702 } 1703 1704 static int cp210x_gpio_init(struct usb_serial *serial) 1705 { 1706 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1707 int result; 1708 1709 switch (priv->partnum) { 1710 case CP210X_PARTNUM_CP2104: 1711 result = cp2104_gpioconf_init(serial); 1712 break; 1713 case CP210X_PARTNUM_CP2105: 1714 result = cp2105_gpioconf_init(serial); 1715 break; 1716 case CP210X_PARTNUM_CP2102N_QFN28: 1717 case CP210X_PARTNUM_CP2102N_QFN24: 1718 case CP210X_PARTNUM_CP2102N_QFN20: 1719 result = cp2102n_gpioconf_init(serial); 1720 break; 1721 default: 1722 return 0; 1723 } 1724 1725 if (result < 0) 1726 return result; 1727 1728 priv->gc.label = "cp210x"; 1729 priv->gc.request = cp210x_gpio_request; 1730 priv->gc.get_direction = cp210x_gpio_direction_get; 1731 priv->gc.direction_input = cp210x_gpio_direction_input; 1732 priv->gc.direction_output = cp210x_gpio_direction_output; 1733 priv->gc.get = cp210x_gpio_get; 1734 priv->gc.set = cp210x_gpio_set; 1735 priv->gc.set_config = cp210x_gpio_set_config; 1736 priv->gc.owner = THIS_MODULE; 1737 priv->gc.parent = &serial->interface->dev; 1738 priv->gc.base = -1; 1739 priv->gc.can_sleep = true; 1740 1741 result = gpiochip_add_data(&priv->gc, serial); 1742 if (!result) 1743 priv->gpio_registered = true; 1744 1745 return result; 1746 } 1747 1748 static void cp210x_gpio_remove(struct usb_serial *serial) 1749 { 1750 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1751 1752 if (priv->gpio_registered) { 1753 gpiochip_remove(&priv->gc); 1754 priv->gpio_registered = false; 1755 } 1756 } 1757 1758 #else 1759 1760 static int cp210x_gpio_init(struct usb_serial *serial) 1761 { 1762 return 0; 1763 } 1764 1765 static void cp210x_gpio_remove(struct usb_serial *serial) 1766 { 1767 /* Nothing to do */ 1768 } 1769 1770 #endif 1771 1772 static int cp210x_port_probe(struct usb_serial_port *port) 1773 { 1774 struct usb_serial *serial = port->serial; 1775 struct cp210x_port_private *port_priv; 1776 int ret; 1777 1778 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 1779 if (!port_priv) 1780 return -ENOMEM; 1781 1782 port_priv->bInterfaceNumber = cp210x_interface_num(serial); 1783 1784 usb_set_serial_port_data(port, port_priv); 1785 1786 ret = cp210x_detect_swapped_line_ctl(port); 1787 if (ret) { 1788 kfree(port_priv); 1789 return ret; 1790 } 1791 1792 return 0; 1793 } 1794 1795 static int cp210x_port_remove(struct usb_serial_port *port) 1796 { 1797 struct cp210x_port_private *port_priv; 1798 1799 port_priv = usb_get_serial_port_data(port); 1800 kfree(port_priv); 1801 1802 return 0; 1803 } 1804 1805 static void cp210x_init_max_speed(struct usb_serial *serial) 1806 { 1807 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1808 bool use_actual_rate = false; 1809 speed_t min = 300; 1810 speed_t max; 1811 1812 switch (priv->partnum) { 1813 case CP210X_PARTNUM_CP2101: 1814 max = 921600; 1815 break; 1816 case CP210X_PARTNUM_CP2102: 1817 case CP210X_PARTNUM_CP2103: 1818 max = 1000000; 1819 break; 1820 case CP210X_PARTNUM_CP2104: 1821 use_actual_rate = true; 1822 max = 2000000; 1823 break; 1824 case CP210X_PARTNUM_CP2108: 1825 max = 2000000; 1826 break; 1827 case CP210X_PARTNUM_CP2105: 1828 if (cp210x_interface_num(serial) == 0) { 1829 use_actual_rate = true; 1830 max = 2000000; /* ECI */ 1831 } else { 1832 min = 2400; 1833 max = 921600; /* SCI */ 1834 } 1835 break; 1836 case CP210X_PARTNUM_CP2102N_QFN28: 1837 case CP210X_PARTNUM_CP2102N_QFN24: 1838 case CP210X_PARTNUM_CP2102N_QFN20: 1839 use_actual_rate = true; 1840 max = 3000000; 1841 break; 1842 default: 1843 max = 2000000; 1844 break; 1845 } 1846 1847 priv->min_speed = min; 1848 priv->max_speed = max; 1849 priv->use_actual_rate = use_actual_rate; 1850 } 1851 1852 static int cp210x_attach(struct usb_serial *serial) 1853 { 1854 int result; 1855 struct cp210x_serial_private *priv; 1856 1857 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1858 if (!priv) 1859 return -ENOMEM; 1860 1861 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1862 CP210X_GET_PARTNUM, &priv->partnum, 1863 sizeof(priv->partnum)); 1864 if (result < 0) { 1865 dev_warn(&serial->interface->dev, 1866 "querying part number failed\n"); 1867 priv->partnum = CP210X_PARTNUM_UNKNOWN; 1868 } 1869 1870 usb_set_serial_data(serial, priv); 1871 1872 cp210x_init_max_speed(serial); 1873 1874 result = cp210x_gpio_init(serial); 1875 if (result < 0) { 1876 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n", 1877 result); 1878 } 1879 1880 return 0; 1881 } 1882 1883 static void cp210x_disconnect(struct usb_serial *serial) 1884 { 1885 cp210x_gpio_remove(serial); 1886 } 1887 1888 static void cp210x_release(struct usb_serial *serial) 1889 { 1890 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1891 1892 cp210x_gpio_remove(serial); 1893 1894 kfree(priv); 1895 } 1896 1897 module_usb_serial_driver(serial_drivers, id_table); 1898 1899 MODULE_DESCRIPTION(DRIVER_DESC); 1900 MODULE_LICENSE("GPL v2"); 1901