drivers/usb/serial/cp210x.c

   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 ([email protected])
   6  * Copyright (C) 2010-2021 Johan Hovold ([email protected])
   7  *
   8  * Support to set flow control line levels using TIOCMGET and TIOCMSET
   9  * thanks to Karl Hiramoto [email protected]. RTSCTS hardware flow
  10  * control thanks to Munir Nassar [email protected]
  11  *
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/errno.h>
  16 #include <linux/slab.h>
  17 #include <linux/tty.h>
  18 #include <linux/tty_flip.h>
  19 #include <linux/module.h>
  20 #include <linux/usb.h>
  21 #include <linux/usb/serial.h>
  22 #include <linux/gpio/driver.h>
  23 #include <linux/bitops.h>
  24 #include <linux/mutex.h>
  25
  26 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
  27
  28 /*
  29  * Function Prototypes
  30  */
  31 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
  32 static void cp210x_close(struct usb_serial_port *);
  33 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
  34                                                         struct ktermios *);
  35 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
  36                                                         struct ktermios*);
  37 static bool cp210x_tx_empty(struct usb_serial_port *port);
  38 static int cp210x_tiocmget(struct tty_struct *);
  39 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
  40 static int cp210x_tiocmset_port(struct usb_serial_port *port,
  41                 unsigned int, unsigned int);
  42 static void cp210x_break_ctl(struct tty_struct *, int);
  43 static int cp210x_attach(struct usb_serial *);
  44 static void cp210x_disconnect(struct usb_serial *);
  45 static void cp210x_release(struct usb_serial *);
  46 static int cp210x_port_probe(struct usb_serial_port *);
  47 static void cp210x_port_remove(struct usb_serial_port *);
  48 static void cp210x_dtr_rts(struct usb_serial_port *port, int on);
  49 static void cp210x_process_read_urb(struct urb *urb);
  50 static void cp210x_enable_event_mode(struct usb_serial_port *port);
  51 static void cp210x_disable_event_mode(struct usb_serial_port *port);
  52
  53 static const struct usb_device_id id_table[] = {
  54         { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
  55         { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
  56         { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  57         { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  58         { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
  59         { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
  60         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
  61         { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
  62         { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
  63         { USB_DEVICE(0x0988, 0x0578) }, /* Teraoka AD2000 */
  64         { USB_DEVICE(0x0B00, 0x3070) }, /* Ingenico 3070 */
  65         { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
  66         { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
  67         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  68         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
  69         { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
  70         { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
  71         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  72         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  73         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  74         { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
  75         { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
  76         { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
  77         { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
  78         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  79         { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
  80         { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
  81         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
  82         { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
  83         { USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */
  84         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  85         { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
  86         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  87         { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
  88         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  89         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
  90         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  91         { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
  92         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  93         { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
  94         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
  95         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
  96         { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
  97         { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
  98         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
  99         { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
 100         { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */
 101         { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */
 102         { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */
 103         { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
 104         { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
 105         { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
 106         { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
 107         { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
 108         { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
 109         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
 110         { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
 111         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
 112         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
 113         { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
 114         { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
 115         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
 116         { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
 117         { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
 118         { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
 119         { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
 120         { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */
 121         { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */
 122         { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */
 123         { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
 124         { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
 125         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
 126         { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
 127         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
 128         { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */
 129         { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
 130         { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
 131         { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
 132         { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
 133         { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
 134         { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
 135         { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
 136         { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */
 137         { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */
 138         { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */
 139         { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
 140         { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
 141         { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
 142         { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
 143         { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
 144         { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
 145         { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
 146         { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
 147         { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
 148         { USB_DEVICE(0x10C4, 0x88D8) }, /* Acuity Brands nLight Air Adapter */
 149         { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */
 150         { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */
 151         { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
 152         { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
 153         { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
 154         { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
 155         { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */
 156         { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */
 157         { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
 158         { USB_DEVICE(0x10C4, 0x8A5B) }, /* CEL EM3588 ZigBee USB Stick */
 159         { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
 160         { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
 161         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 162         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 163         { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */
 164         { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
 165         { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
 166         { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */
 167         { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */
 168         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 169         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 170         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 171         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 172         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 173         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 174         { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
 175         { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
 176         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 177         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 178         { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */
 179         { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
 180         { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
 181         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 182         { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
 183         { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
 184         { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
 185         { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
 186         { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
 187         { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
 188         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 189         { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
 190         { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
 191         { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
 192         { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
 193         { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
 194         { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
 195         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
 196         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
 197         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 198         { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
 199         { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
 200         { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
 201         { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
 202         { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
 203         { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
 204         { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
 205         { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
 206         { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 M.2 Key E serial interface */
 207         { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 Display serial interface */
 208         { USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */
 209         { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
 210         { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
 211         { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
 212         { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
 213         { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
 214         { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
 215         { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
 216         { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
 217         { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
 218         { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
 219         { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
 220         { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
 221         { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
 222         { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
 223         { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
 224         { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
 225         { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
 226         { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
 227         { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
 228         { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
 229         { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
 230         { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
 231         { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
 232         { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
 233         { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
 234         { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
 235         { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
 236         { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
 237         { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
 238         { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
 239         { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
 240         { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
 241         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 242         { } /* Terminating Entry */
 243 };
 244
 245 MODULE_DEVICE_TABLE(usb, id_table);
 246
 247 struct cp210x_serial_private {
 248 #ifdef CONFIG_GPIOLIB
 249         struct gpio_chip        gc;
 250         bool                    gpio_registered;
 251         u16                     gpio_pushpull;
 252         u16                     gpio_altfunc;
 253         u16                     gpio_input;
 254 #endif
 255         u8                      partnum;
 256         u32                     fw_version;
 257         speed_t                 min_speed;
 258         speed_t                 max_speed;
 259         bool                    use_actual_rate;
 260         bool                    no_flow_control;
 261 };
 262
 263 enum cp210x_event_state {
 264         ES_DATA,
 265         ES_ESCAPE,
 266         ES_LSR,
 267         ES_LSR_DATA_0,
 268         ES_LSR_DATA_1,
 269         ES_MSR
 270 };
 271
 272 struct cp210x_port_private {
 273         u8                      bInterfaceNumber;
 274         bool                    event_mode;
 275         enum cp210x_event_state event_state;
 276         u8                      lsr;
 277
 278         struct mutex            mutex;
 279         bool                    crtscts;
 280         bool                    dtr;
 281         bool                    rts;
 282 };
 283
 284 static struct usb_serial_driver cp210x_device = {
 285         .driver = {
 286                 .owner =        THIS_MODULE,
 287                 .name =         "cp210x",
 288         },
 289         .id_table               = id_table,
 290         .num_ports              = 1,
 291         .bulk_in_size           = 256,
 292         .bulk_out_size          = 256,
 293         .open                   = cp210x_open,
 294         .close                  = cp210x_close,
 295         .break_ctl              = cp210x_break_ctl,
 296         .set_termios            = cp210x_set_termios,
 297         .tx_empty               = cp210x_tx_empty,
 298         .throttle               = usb_serial_generic_throttle,
 299         .unthrottle             = usb_serial_generic_unthrottle,
 300         .tiocmget               = cp210x_tiocmget,
 301         .tiocmset               = cp210x_tiocmset,
 302         .get_icount             = usb_serial_generic_get_icount,
 303         .attach                 = cp210x_attach,
 304         .disconnect             = cp210x_disconnect,
 305         .release                = cp210x_release,
 306         .port_probe             = cp210x_port_probe,
 307         .port_remove            = cp210x_port_remove,
 308         .dtr_rts                = cp210x_dtr_rts,
 309         .process_read_urb       = cp210x_process_read_urb,
 310 };
 311
 312 static struct usb_serial_driver * const serial_drivers[] = {
 313         &cp210x_device, NULL
 314 };
 315
 316 /* Config request types */
 317 #define REQTYPE_HOST_TO_INTERFACE       0x41
 318 #define REQTYPE_INTERFACE_TO_HOST       0xc1
 319 #define REQTYPE_HOST_TO_DEVICE  0x40
 320 #define REQTYPE_DEVICE_TO_HOST  0xc0
 321
 322 /* Config request codes */
 323 #define CP210X_IFC_ENABLE       0x00
 324 #define CP210X_SET_BAUDDIV      0x01
 325 #define CP210X_GET_BAUDDIV      0x02
 326 #define CP210X_SET_LINE_CTL     0x03
 327 #define CP210X_GET_LINE_CTL     0x04
 328 #define CP210X_SET_BREAK        0x05
 329 #define CP210X_IMM_CHAR         0x06
 330 #define CP210X_SET_MHS          0x07
 331 #define CP210X_GET_MDMSTS       0x08
 332 #define CP210X_SET_XON          0x09
 333 #define CP210X_SET_XOFF         0x0A
 334 #define CP210X_SET_EVENTMASK    0x0B
 335 #define CP210X_GET_EVENTMASK    0x0C
 336 #define CP210X_SET_CHAR         0x0D
 337 #define CP210X_GET_CHARS        0x0E
 338 #define CP210X_GET_PROPS        0x0F
 339 #define CP210X_GET_COMM_STATUS  0x10
 340 #define CP210X_RESET            0x11
 341 #define CP210X_PURGE            0x12
 342 #define CP210X_SET_FLOW         0x13
 343 #define CP210X_GET_FLOW         0x14
 344 #define CP210X_EMBED_EVENTS     0x15
 345 #define CP210X_GET_EVENTSTATE   0x16
 346 #define CP210X_SET_CHARS        0x19
 347 #define CP210X_GET_BAUDRATE     0x1D
 348 #define CP210X_SET_BAUDRATE     0x1E
 349 #define CP210X_VENDOR_SPECIFIC  0xFF
 350
 351 /* CP210X_IFC_ENABLE */
 352 #define UART_ENABLE             0x0001
 353 #define UART_DISABLE            0x0000
 354
 355 /* CP210X_(SET|GET)_BAUDDIV */
 356 #define BAUD_RATE_GEN_FREQ      0x384000
 357
 358 /* CP210X_(SET|GET)_LINE_CTL */
 359 #define BITS_DATA_MASK          0X0f00
 360 #define BITS_DATA_5             0X0500
 361 #define BITS_DATA_6             0X0600
 362 #define BITS_DATA_7             0X0700
 363 #define BITS_DATA_8             0X0800
 364 #define BITS_DATA_9             0X0900
 365
 366 #define BITS_PARITY_MASK        0x00f0
 367 #define BITS_PARITY_NONE        0x0000
 368 #define BITS_PARITY_ODD         0x0010
 369 #define BITS_PARITY_EVEN        0x0020
 370 #define BITS_PARITY_MARK        0x0030
 371 #define BITS_PARITY_SPACE       0x0040
 372
 373 #define BITS_STOP_MASK          0x000f
 374 #define BITS_STOP_1             0x0000
 375 #define BITS_STOP_1_5           0x0001
 376 #define BITS_STOP_2             0x0002
 377
 378 /* CP210X_SET_BREAK */
 379 #define BREAK_ON                0x0001
 380 #define BREAK_OFF               0x0000
 381
 382 /* CP210X_(SET_MHS|GET_MDMSTS) */
 383 #define CONTROL_DTR             0x0001
 384 #define CONTROL_RTS             0x0002
 385 #define CONTROL_CTS             0x0010
 386 #define CONTROL_DSR             0x0020
 387 #define CONTROL_RING            0x0040
 388 #define CONTROL_DCD             0x0080
 389 #define CONTROL_WRITE_DTR       0x0100
 390 #define CONTROL_WRITE_RTS       0x0200
 391
 392 /* CP210X_(GET|SET)_CHARS */
 393 struct cp210x_special_chars {
 394         u8      bEofChar;
 395         u8      bErrorChar;
 396         u8      bBreakChar;
 397         u8      bEventChar;
 398         u8      bXonChar;
 399         u8      bXoffChar;
 400 };
 401
 402 /* CP210X_VENDOR_SPECIFIC values */
 403 #define CP210X_READ_2NCONFIG    0x000E
 404 #define CP210X_GET_FW_VER_2N    0x0010
 405 #define CP210X_READ_LATCH       0x00C2
 406 #define CP210X_GET_PARTNUM      0x370B
 407 #define CP210X_GET_PORTCONFIG   0x370C
 408 #define CP210X_GET_DEVICEMODE   0x3711
 409 #define CP210X_WRITE_LATCH      0x37E1
 410
 411 /* Part number definitions */
 412 #define CP210X_PARTNUM_CP2101   0x01
 413 #define CP210X_PARTNUM_CP2102   0x02
 414 #define CP210X_PARTNUM_CP2103   0x03
 415 #define CP210X_PARTNUM_CP2104   0x04
 416 #define CP210X_PARTNUM_CP2105   0x05
 417 #define CP210X_PARTNUM_CP2108   0x08
 418 #define CP210X_PARTNUM_CP2102N_QFN28    0x20
 419 #define CP210X_PARTNUM_CP2102N_QFN24    0x21
 420 #define CP210X_PARTNUM_CP2102N_QFN20    0x22
 421 #define CP210X_PARTNUM_UNKNOWN  0xFF
 422
 423 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
 424 struct cp210x_comm_status {
 425         __le32   ulErrors;
 426         __le32   ulHoldReasons;
 427         __le32   ulAmountInInQueue;
 428         __le32   ulAmountInOutQueue;
 429         u8       bEofReceived;
 430         u8       bWaitForImmediate;
 431         u8       bReserved;
 432 } __packed;
 433
 434 /*
 435  * CP210X_PURGE - 16 bits passed in wValue of USB request.
 436  * SiLabs app note AN571 gives a strange description of the 4 bits:
 437  * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
 438  * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
 439  */
 440 #define PURGE_ALL               0x000f
 441
 442 /* CP210X_EMBED_EVENTS */
 443 #define CP210X_ESCCHAR          0xec
 444
 445 #define CP210X_LSR_OVERRUN      BIT(1)
 446 #define CP210X_LSR_PARITY       BIT(2)
 447 #define CP210X_LSR_FRAME        BIT(3)
 448 #define CP210X_LSR_BREAK        BIT(4)
 449
 450
 451 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
 452 struct cp210x_flow_ctl {
 453         __le32  ulControlHandshake;
 454         __le32  ulFlowReplace;
 455         __le32  ulXonLimit;
 456         __le32  ulXoffLimit;
 457 };
 458
 459 /* cp210x_flow_ctl::ulControlHandshake */
 460 #define CP210X_SERIAL_DTR_MASK          GENMASK(1, 0)
 461 #define CP210X_SERIAL_DTR_INACTIVE      (0 << 0)
 462 #define CP210X_SERIAL_DTR_ACTIVE        (1 << 0)
 463 #define CP210X_SERIAL_DTR_FLOW_CTL      (2 << 0)
 464 #define CP210X_SERIAL_CTS_HANDSHAKE     BIT(3)
 465 #define CP210X_SERIAL_DSR_HANDSHAKE     BIT(4)
 466 #define CP210X_SERIAL_DCD_HANDSHAKE     BIT(5)
 467 #define CP210X_SERIAL_DSR_SENSITIVITY   BIT(6)
 468
 469 /* cp210x_flow_ctl::ulFlowReplace */
 470 #define CP210X_SERIAL_AUTO_TRANSMIT     BIT(0)
 471 #define CP210X_SERIAL_AUTO_RECEIVE      BIT(1)
 472 #define CP210X_SERIAL_ERROR_CHAR        BIT(2)
 473 #define CP210X_SERIAL_NULL_STRIPPING    BIT(3)
 474 #define CP210X_SERIAL_BREAK_CHAR        BIT(4)
 475 #define CP210X_SERIAL_RTS_MASK          GENMASK(7, 6)
 476 #define CP210X_SERIAL_RTS_INACTIVE      (0 << 6)
 477 #define CP210X_SERIAL_RTS_ACTIVE        (1 << 6)
 478 #define CP210X_SERIAL_RTS_FLOW_CTL      (2 << 6)
 479 #define CP210X_SERIAL_XOFF_CONTINUE     BIT(31)
 480
 481 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
 482 struct cp210x_pin_mode {
 483         u8      eci;
 484         u8      sci;
 485 };
 486
 487 #define CP210X_PIN_MODE_MODEM           0
 488 #define CP210X_PIN_MODE_GPIO            BIT(0)
 489
 490 /*
 491  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes
 492  * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes.
 493  */
 494 struct cp210x_dual_port_config {
 495         __le16  gpio_mode;
 496         u8      __pad0[2];
 497         __le16  reset_state;
 498         u8      __pad1[4];
 499         __le16  suspend_state;
 500         u8      sci_cfg;
 501         u8      eci_cfg;
 502         u8      device_cfg;
 503 } __packed;
 504
 505 /*
 506  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes
 507  * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes.
 508  */
 509 struct cp210x_single_port_config {
 510         __le16  gpio_mode;
 511         u8      __pad0[2];
 512         __le16  reset_state;
 513         u8      __pad1[4];
 514         __le16  suspend_state;
 515         u8      device_cfg;
 516 } __packed;
 517
 518 /* GPIO modes */
 519 #define CP210X_SCI_GPIO_MODE_OFFSET     9
 520 #define CP210X_SCI_GPIO_MODE_MASK       GENMASK(11, 9)
 521
 522 #define CP210X_ECI_GPIO_MODE_OFFSET     2
 523 #define CP210X_ECI_GPIO_MODE_MASK       GENMASK(3, 2)
 524
 525 #define CP210X_GPIO_MODE_OFFSET         8
 526 #define CP210X_GPIO_MODE_MASK           GENMASK(11, 8)
 527
 528 /* CP2105 port configuration values */
 529 #define CP2105_GPIO0_TXLED_MODE         BIT(0)
 530 #define CP2105_GPIO1_RXLED_MODE         BIT(1)
 531 #define CP2105_GPIO1_RS485_MODE         BIT(2)
 532
 533 /* CP2104 port configuration values */
 534 #define CP2104_GPIO0_TXLED_MODE         BIT(0)
 535 #define CP2104_GPIO1_RXLED_MODE         BIT(1)
 536 #define CP2104_GPIO2_RS485_MODE         BIT(2)
 537
 538 struct cp210x_quad_port_state {
 539         __le16 gpio_mode_pb0;
 540         __le16 gpio_mode_pb1;
 541         __le16 gpio_mode_pb2;
 542         __le16 gpio_mode_pb3;
 543         __le16 gpio_mode_pb4;
 544
 545         __le16 gpio_lowpower_pb0;
 546         __le16 gpio_lowpower_pb1;
 547         __le16 gpio_lowpower_pb2;
 548         __le16 gpio_lowpower_pb3;
 549         __le16 gpio_lowpower_pb4;
 550
 551         __le16 gpio_latch_pb0;
 552         __le16 gpio_latch_pb1;
 553         __le16 gpio_latch_pb2;
 554         __le16 gpio_latch_pb3;
 555         __le16 gpio_latch_pb4;
 556 };
 557
 558 /*
 559  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0x49 bytes
 560  * on a CP2108 chip.
 561  *
 562  * See https://www.silabs.com/documents/public/application-notes/an978-cp210x-usb-to-uart-api-specification.pdf
 563  */
 564 struct cp210x_quad_port_config {
 565         struct cp210x_quad_port_state reset_state;
 566         struct cp210x_quad_port_state suspend_state;
 567         u8 ipdelay_ifc[4];
 568         u8 enhancedfxn_ifc[4];
 569         u8 enhancedfxn_device;
 570         u8 extclkfreq[4];
 571 } __packed;
 572
 573 #define CP2108_EF_IFC_GPIO_TXLED                0x01
 574 #define CP2108_EF_IFC_GPIO_RXLED                0x02
 575 #define CP2108_EF_IFC_GPIO_RS485                0x04
 576 #define CP2108_EF_IFC_GPIO_RS485_LOGIC          0x08
 577 #define CP2108_EF_IFC_GPIO_CLOCK                0x10
 578 #define CP2108_EF_IFC_DYNAMIC_SUSPEND           0x40
 579
 580 /* CP2102N configuration array indices */
 581 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX      2
 582 #define CP210X_2NCONFIG_GPIO_MODE_IDX           581
 583 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX       587
 584 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX        600
 585
 586 /* CP2102N QFN20 port configuration values */
 587 #define CP2102N_QFN20_GPIO2_TXLED_MODE          BIT(2)
 588 #define CP2102N_QFN20_GPIO3_RXLED_MODE          BIT(3)
 589 #define CP2102N_QFN20_GPIO1_RS485_MODE          BIT(4)
 590 #define CP2102N_QFN20_GPIO0_CLK_MODE            BIT(6)
 591
 592 /*
 593  * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x02 bytes
 594  * for CP2102N, CP2103, CP2104 and CP2105.
 595  */
 596 struct cp210x_gpio_write {
 597         u8      mask;
 598         u8      state;
 599 };
 600
 601 /*
 602  * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x04 bytes
 603  * for CP2108.
 604  */
 605 struct cp210x_gpio_write16 {
 606         __le16  mask;
 607         __le16  state;
 608 };
 609
 610 /*
 611  * Helper to get interface number when we only have struct usb_serial.
 612  */
 613 static u8 cp210x_interface_num(struct usb_serial *serial)
 614 {
 615         struct usb_host_interface *cur_altsetting;
 616
 617         cur_altsetting = serial->interface->cur_altsetting;
 618
 619         return cur_altsetting->desc.bInterfaceNumber;
 620 }
 621
 622 /*
 623  * Reads a variable-sized block of CP210X_ registers, identified by req.
 624  * Returns data into buf in native USB byte order.
 625  */
 626 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
 627                 void *buf, int bufsize)
 628 {
 629         struct usb_serial *serial = port->serial;
 630         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 631         void *dmabuf;
 632         int result;
 633
 634         dmabuf = kmalloc(bufsize, GFP_KERNEL);
 635         if (!dmabuf)
 636                 return -ENOMEM;
 637
 638         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 639                         req, REQTYPE_INTERFACE_TO_HOST, 0,
 640                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 641                         USB_CTRL_SET_TIMEOUT);
 642         if (result == bufsize) {
 643                 memcpy(buf, dmabuf, bufsize);
 644                 result = 0;
 645         } else {
 646                 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
 647                                 req, bufsize, result);
 648                 if (result >= 0)
 649                         result = -EIO;
 650         }
 651
 652         kfree(dmabuf);
 653
 654         return result;
 655 }
 656
 657 /*
 658  * Reads any 8-bit CP210X_ register identified by req.
 659  */
 660 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
 661 {
 662         return cp210x_read_reg_block(port, req, val, sizeof(*val));
 663 }
 664
 665 /*
 666  * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
 667  * Returns data into buf in native USB byte order.
 668  */
 669 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
 670                                     void *buf, int bufsize)
 671 {
 672         void *dmabuf;
 673         int result;
 674
 675         dmabuf = kmalloc(bufsize, GFP_KERNEL);
 676         if (!dmabuf)
 677                 return -ENOMEM;
 678
 679         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 680                                  CP210X_VENDOR_SPECIFIC, type, val,
 681                                  cp210x_interface_num(serial), dmabuf, bufsize,
 682                                  USB_CTRL_GET_TIMEOUT);
 683         if (result == bufsize) {
 684                 memcpy(buf, dmabuf, bufsize);
 685                 result = 0;
 686         } else {
 687                 dev_err(&serial->interface->dev,
 688                         "failed to get vendor val 0x%04x size %d: %d\n", val,
 689                         bufsize, result);
 690                 if (result >= 0)
 691                         result = -EIO;
 692         }
 693
 694         kfree(dmabuf);
 695
 696         return result;
 697 }
 698
 699 /*
 700  * Writes any 16-bit CP210X_ register (req) whose value is passed
 701  * entirely in the wValue field of the USB request.
 702  */
 703 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
 704 {
 705         struct usb_serial *serial = port->serial;
 706         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 707         int result;
 708
 709         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 710                         req, REQTYPE_HOST_TO_INTERFACE, val,
 711                         port_priv->bInterfaceNumber, NULL, 0,
 712                         USB_CTRL_SET_TIMEOUT);
 713         if (result < 0) {
 714                 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
 715                                 req, result);
 716         }
 717
 718         return result;
 719 }
 720
 721 /*
 722  * Writes a variable-sized block of CP210X_ registers, identified by req.
 723  * Data in buf must be in native USB byte order.
 724  */
 725 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
 726                 void *buf, int bufsize)
 727 {
 728         struct usb_serial *serial = port->serial;
 729         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 730         void *dmabuf;
 731         int result;
 732
 733         dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
 734         if (!dmabuf)
 735                 return -ENOMEM;
 736
 737         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 738                         req, REQTYPE_HOST_TO_INTERFACE, 0,
 739                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 740                         USB_CTRL_SET_TIMEOUT);
 741
 742         kfree(dmabuf);
 743
 744         if (result < 0) {
 745                 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
 746                                 req, bufsize, result);
 747                 return result;
 748         }
 749
 750         return 0;
 751 }
 752
 753 /*
 754  * Writes any 32-bit CP210X_ register identified by req.
 755  */
 756 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
 757 {
 758         __le32 le32_val;
 759
 760         le32_val = cpu_to_le32(val);
 761
 762         return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
 763 }
 764
 765 #ifdef CONFIG_GPIOLIB
 766 /*
 767  * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
 768  * Data in buf must be in native USB byte order.
 769  */
 770 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
 771                                      u16 val, void *buf, int bufsize)
 772 {
 773         void *dmabuf;
 774         int result;
 775
 776         dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
 777         if (!dmabuf)
 778                 return -ENOMEM;
 779
 780         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 781                                  CP210X_VENDOR_SPECIFIC, type, val,
 782                                  cp210x_interface_num(serial), dmabuf, bufsize,
 783                                  USB_CTRL_SET_TIMEOUT);
 784
 785         kfree(dmabuf);
 786
 787         if (result < 0) {
 788                 dev_err(&serial->interface->dev,
 789                         "failed to set vendor val 0x%04x size %d: %d\n", val,
 790                         bufsize, result);
 791                 return result;
 792         }
 793
 794         return 0;
 795 }
 796 #endif
 797
 798 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 799 {
 800         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 801         int result;
 802
 803         result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
 804         if (result) {
 805                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
 806                 return result;
 807         }
 808
 809         if (tty)
 810                 cp210x_set_termios(tty, port, NULL);
 811
 812         result = usb_serial_generic_open(tty, port);
 813         if (result)
 814                 goto err_disable;
 815
 816         return 0;
 817
 818 err_disable:
 819         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 820         port_priv->event_mode = false;
 821
 822         return result;
 823 }
 824
 825 static void cp210x_close(struct usb_serial_port *port)
 826 {
 827         struct cp210x_port_private *port_priv = usb_get_serial_port_data(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         /* Disabling the interface disables event-insertion mode. */
 837         port_priv->event_mode = false;
 838 }
 839
 840 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag)
 841 {
 842         if (lsr & CP210X_LSR_BREAK) {
 843                 port->icount.brk++;
 844                 *flag = TTY_BREAK;
 845         } else if (lsr & CP210X_LSR_PARITY) {
 846                 port->icount.parity++;
 847                 *flag = TTY_PARITY;
 848         } else if (lsr & CP210X_LSR_FRAME) {
 849                 port->icount.frame++;
 850                 *flag = TTY_FRAME;
 851         }
 852
 853         if (lsr & CP210X_LSR_OVERRUN) {
 854                 port->icount.overrun++;
 855                 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
 856         }
 857 }
 858
 859 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag)
 860 {
 861         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 862
 863         switch (port_priv->event_state) {
 864         case ES_DATA:
 865                 if (*ch == CP210X_ESCCHAR) {
 866                         port_priv->event_state = ES_ESCAPE;
 867                         break;
 868                 }
 869                 return false;
 870         case ES_ESCAPE:
 871                 switch (*ch) {
 872                 case 0:
 873                         dev_dbg(&port->dev, "%s - escape char\n", __func__);
 874                         *ch = CP210X_ESCCHAR;
 875                         port_priv->event_state = ES_DATA;
 876                         return false;
 877                 case 1:
 878                         port_priv->event_state = ES_LSR_DATA_0;
 879                         break;
 880                 case 2:
 881                         port_priv->event_state = ES_LSR;
 882                         break;
 883                 case 3:
 884                         port_priv->event_state = ES_MSR;
 885                         break;
 886                 default:
 887                         dev_err(&port->dev, "malformed event 0x%02x\n", *ch);
 888                         port_priv->event_state = ES_DATA;
 889                         break;
 890                 }
 891                 break;
 892         case ES_LSR_DATA_0:
 893                 port_priv->lsr = *ch;
 894                 port_priv->event_state = ES_LSR_DATA_1;
 895                 break;
 896         case ES_LSR_DATA_1:
 897                 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n",
 898                                 __func__, port_priv->lsr, *ch);
 899                 cp210x_process_lsr(port, port_priv->lsr, flag);
 900                 port_priv->event_state = ES_DATA;
 901                 return false;
 902         case ES_LSR:
 903                 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch);
 904                 port_priv->lsr = *ch;
 905                 cp210x_process_lsr(port, port_priv->lsr, flag);
 906                 port_priv->event_state = ES_DATA;
 907                 break;
 908         case ES_MSR:
 909                 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch);
 910                 /* unimplemented */
 911                 port_priv->event_state = ES_DATA;
 912                 break;
 913         }
 914
 915         return true;
 916 }
 917
 918 static void cp210x_process_read_urb(struct urb *urb)
 919 {
 920         struct usb_serial_port *port = urb->context;
 921         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 922         unsigned char *ch = urb->transfer_buffer;
 923         char flag;
 924         int i;
 925
 926         if (!urb->actual_length)
 927                 return;
 928
 929         if (port_priv->event_mode) {
 930                 for (i = 0; i < urb->actual_length; i++, ch++) {
 931                         flag = TTY_NORMAL;
 932
 933                         if (cp210x_process_char(port, ch, &flag))
 934                                 continue;
 935
 936                         tty_insert_flip_char(&port->port, *ch, flag);
 937                 }
 938         } else {
 939                 tty_insert_flip_string(&port->port, ch, urb->actual_length);
 940         }
 941         tty_flip_buffer_push(&port->port);
 942 }
 943
 944 /*
 945  * Read how many bytes are waiting in the TX queue.
 946  */
 947 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
 948                 u32 *count)
 949 {
 950         struct usb_serial *serial = port->serial;
 951         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 952         struct cp210x_comm_status *sts;
 953         int result;
 954
 955         sts = kmalloc(sizeof(*sts), GFP_KERNEL);
 956         if (!sts)
 957                 return -ENOMEM;
 958
 959         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 960                         CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
 961                         0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
 962                         USB_CTRL_GET_TIMEOUT);
 963         if (result == sizeof(*sts)) {
 964                 *count = le32_to_cpu(sts->ulAmountInOutQueue);
 965                 result = 0;
 966         } else {
 967                 dev_err(&port->dev, "failed to get comm status: %d\n", result);
 968                 if (result >= 0)
 969                         result = -EIO;
 970         }
 971
 972         kfree(sts);
 973
 974         return result;
 975 }
 976
 977 static bool cp210x_tx_empty(struct usb_serial_port *port)
 978 {
 979         int err;
 980         u32 count;
 981
 982         err = cp210x_get_tx_queue_byte_count(port, &count);
 983         if (err)
 984                 return true;
 985
 986         return !count;
 987 }
 988
 989 struct cp210x_rate {
 990         speed_t rate;
 991         speed_t high;
 992 };
 993
 994 static const struct cp210x_rate cp210x_an205_table1[] = {
 995         { 300, 300 },
 996         { 600, 600 },
 997         { 1200, 1200 },
 998         { 1800, 1800 },
 999         { 2400, 2400 },
1000         { 4000, 4000 },
1001         { 4800, 4803 },
1002         { 7200, 7207 },
1003         { 9600, 9612 },
1004         { 14400, 14428 },
1005         { 16000, 16062 },
1006         { 19200, 19250 },
1007         { 28800, 28912 },
1008         { 38400, 38601 },
1009         { 51200, 51558 },
1010         { 56000, 56280 },
1011         { 57600, 58053 },
1012         { 64000, 64111 },
1013         { 76800, 77608 },
1014         { 115200, 117028 },
1015         { 128000, 129347 },
1016         { 153600, 156868 },
1017         { 230400, 237832 },
1018         { 250000, 254234 },
1019         { 256000, 273066 },
1020         { 460800, 491520 },
1021         { 500000, 567138 },
1022         { 576000, 670254 },
1023         { 921600, UINT_MAX }
1024 };
1025
1026 /*
1027  * Quantises the baud rate as per AN205 Table 1
1028  */
1029 static speed_t cp210x_get_an205_rate(speed_t baud)
1030 {
1031         int i;
1032
1033         for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) {
1034                 if (baud <= cp210x_an205_table1[i].high)
1035                         break;
1036         }
1037
1038         return cp210x_an205_table1[i].rate;
1039 }
1040
1041 static speed_t cp210x_get_actual_rate(speed_t baud)
1042 {
1043         unsigned int prescale = 1;
1044         unsigned int div;
1045
1046         if (baud <= 365)
1047                 prescale = 4;
1048
1049         div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud);
1050         baud = 48000000 / (2 * prescale * div);
1051
1052         return baud;
1053 }
1054
1055 /*
1056  * CP2101 supports the following baud rates:
1057  *
1058  *      300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1059  *      38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1060  *
1061  * CP2102 and CP2103 support the following additional rates:
1062  *
1063  *      4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1064  *      576000
1065  *
1066  * The device will map a requested rate to a supported one, but the result
1067  * of requests for rates greater than 1053257 is undefined (see AN205).
1068  *
1069  * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1070  * respectively, with an error less than 1%. The actual rates are determined
1071  * by
1072  *
1073  *      div = round(freq / (2 x prescale x request))
1074  *      actual = freq / (2 x prescale x div)
1075  *
1076  * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1077  * or 1 otherwise.
1078  * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1079  * otherwise.
1080  */
1081 static void cp210x_change_speed(struct tty_struct *tty,
1082                 struct usb_serial_port *port, struct ktermios *old_termios)
1083 {
1084         struct usb_serial *serial = port->serial;
1085         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1086         u32 baud;
1087
1088         /*
1089          * This maps the requested rate to the actual rate, a valid rate on
1090          * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed].
1091          *
1092          * NOTE: B0 is not implemented.
1093          */
1094         baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed);
1095
1096         if (priv->use_actual_rate)
1097                 baud = cp210x_get_actual_rate(baud);
1098         else if (baud < 1000000)
1099                 baud = cp210x_get_an205_rate(baud);
1100
1101         dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1102         if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1103                 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1104                 if (old_termios)
1105                         baud = old_termios->c_ospeed;
1106                 else
1107                         baud = 9600;
1108         }
1109
1110         tty_encode_baud_rate(tty, baud, baud);
1111 }
1112
1113 static void cp210x_enable_event_mode(struct usb_serial_port *port)
1114 {
1115         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1116         int ret;
1117
1118         if (port_priv->event_mode)
1119                 return;
1120
1121         port_priv->event_state = ES_DATA;
1122         port_priv->event_mode = true;
1123
1124         ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR);
1125         if (ret) {
1126                 dev_err(&port->dev, "failed to enable events: %d\n", ret);
1127                 port_priv->event_mode = false;
1128         }
1129 }
1130
1131 static void cp210x_disable_event_mode(struct usb_serial_port *port)
1132 {
1133         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1134         int ret;
1135
1136         if (!port_priv->event_mode)
1137                 return;
1138
1139         ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0);
1140         if (ret) {
1141                 dev_err(&port->dev, "failed to disable events: %d\n", ret);
1142                 return;
1143         }
1144
1145         port_priv->event_mode = false;
1146 }
1147
1148 static int cp210x_set_chars(struct usb_serial_port *port,
1149                 struct cp210x_special_chars *chars)
1150 {
1151         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1152         struct usb_serial *serial = port->serial;
1153         void *dmabuf;
1154         int result;
1155
1156         dmabuf = kmemdup(chars, sizeof(*chars), GFP_KERNEL);
1157         if (!dmabuf)
1158                 return -ENOMEM;
1159
1160         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1161                                 CP210X_SET_CHARS, REQTYPE_HOST_TO_INTERFACE, 0,
1162                                 port_priv->bInterfaceNumber,
1163                                 dmabuf, sizeof(*chars), USB_CTRL_SET_TIMEOUT);
1164
1165         kfree(dmabuf);
1166
1167         if (result < 0) {
1168                 dev_err(&port->dev, "failed to set special chars: %d\n", result);
1169                 return result;
1170         }
1171
1172         return 0;
1173 }
1174
1175 static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b)
1176 {
1177         bool iflag_change, cc_change;
1178
1179         iflag_change = ((a->c_iflag ^ b->c_iflag) & (INPCK | IXON | IXOFF));
1180         cc_change = a->c_cc[VSTART] != b->c_cc[VSTART] ||
1181                         a->c_cc[VSTOP] != b->c_cc[VSTOP];
1182
1183         return tty_termios_hw_change(a, b) || iflag_change || cc_change;
1184 }
1185
1186 static void cp210x_set_flow_control(struct tty_struct *tty,
1187                 struct usb_serial_port *port, struct ktermios *old_termios)
1188 {
1189         struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1190         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1191         struct cp210x_special_chars chars;
1192         struct cp210x_flow_ctl flow_ctl;
1193         u32 flow_repl;
1194         u32 ctl_hs;
1195         int ret;
1196
1197         /*
1198          * Some CP2102N interpret ulXonLimit as ulFlowReplace (erratum
1199          * CP2102N_E104). Report back that flow control is not supported.
1200          */
1201         if (priv->no_flow_control) {
1202                 tty->termios.c_cflag &= ~CRTSCTS;
1203                 tty->termios.c_iflag &= ~(IXON | IXOFF);
1204         }
1205
1206         if (old_termios &&
1207                         C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) &&
1208                         I_IXON(tty) == (old_termios->c_iflag & IXON) &&
1209                         I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) &&
1210                         START_CHAR(tty) == old_termios->c_cc[VSTART] &&
1211                         STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) {
1212                 return;
1213         }
1214
1215         if (I_IXON(tty) || I_IXOFF(tty)) {
1216                 memset(&chars, 0, sizeof(chars));
1217
1218                 chars.bXonChar = START_CHAR(tty);
1219                 chars.bXoffChar = STOP_CHAR(tty);
1220
1221                 ret = cp210x_set_chars(port, &chars);
1222                 if (ret)
1223                         return;
1224         }
1225
1226         mutex_lock(&port_priv->mutex);
1227
1228         ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1229                         sizeof(flow_ctl));
1230         if (ret)
1231                 goto out_unlock;
1232
1233         ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1234         flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1235
1236         ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1237         ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1238         ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1239         ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1240         if (port_priv->dtr)
1241                 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
1242         else
1243                 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
1244
1245         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1246         if (C_CRTSCTS(tty)) {
1247                 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1248                 if (port_priv->rts)
1249                         flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
1250                 else
1251                         flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1252                 port_priv->crtscts = true;
1253         } else {
1254                 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1255                 if (port_priv->rts)
1256                         flow_repl |= CP210X_SERIAL_RTS_ACTIVE;
1257                 else
1258                         flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1259                 port_priv->crtscts = false;
1260         }
1261
1262         if (I_IXOFF(tty)) {
1263                 flow_repl |= CP210X_SERIAL_AUTO_RECEIVE;
1264
1265                 flow_ctl.ulXonLimit = cpu_to_le32(128);
1266                 flow_ctl.ulXoffLimit = cpu_to_le32(128);
1267         } else {
1268                 flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE;
1269         }
1270
1271         if (I_IXON(tty))
1272                 flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT;
1273         else
1274                 flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT;
1275
1276         dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__,
1277                         ctl_hs, flow_repl);
1278
1279         flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1280         flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1281
1282         cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1283                         sizeof(flow_ctl));
1284 out_unlock:
1285         mutex_unlock(&port_priv->mutex);
1286 }
1287
1288 static void cp210x_set_termios(struct tty_struct *tty,
1289                 struct usb_serial_port *port, struct ktermios *old_termios)
1290 {
1291         struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1292         u16 bits;
1293         int ret;
1294
1295         if (old_termios && !cp210x_termios_change(&tty->termios, old_termios))
1296                 return;
1297
1298         if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed)
1299                 cp210x_change_speed(tty, port, old_termios);
1300
1301         /* CP2101 only supports CS8, 1 stop bit and non-stick parity. */
1302         if (priv->partnum == CP210X_PARTNUM_CP2101) {
1303                 tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR);
1304                 tty->termios.c_cflag |= CS8;
1305         }
1306
1307         bits = 0;
1308
1309         switch (C_CSIZE(tty)) {
1310         case CS5:
1311                 bits |= BITS_DATA_5;
1312                 break;
1313         case CS6:
1314                 bits |= BITS_DATA_6;
1315                 break;
1316         case CS7:
1317                 bits |= BITS_DATA_7;
1318                 break;
1319         case CS8:
1320         default:
1321                 bits |= BITS_DATA_8;
1322                 break;
1323         }
1324
1325         if (C_PARENB(tty)) {
1326                 if (C_CMSPAR(tty)) {
1327                         if (C_PARODD(tty))
1328                                 bits |= BITS_PARITY_MARK;
1329                         else
1330                                 bits |= BITS_PARITY_SPACE;
1331                 } else {
1332                         if (C_PARODD(tty))
1333                                 bits |= BITS_PARITY_ODD;
1334                         else
1335                                 bits |= BITS_PARITY_EVEN;
1336                 }
1337         }
1338
1339         if (C_CSTOPB(tty))
1340                 bits |= BITS_STOP_2;
1341         else
1342                 bits |= BITS_STOP_1;
1343
1344         ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1345         if (ret)
1346                 dev_err(&port->dev, "failed to set line control: %d\n", ret);
1347
1348         cp210x_set_flow_control(tty, port, old_termios);
1349
1350         /*
1351          * Enable event-insertion mode only if input parity checking is
1352          * enabled for now.
1353          */
1354         if (I_INPCK(tty))
1355                 cp210x_enable_event_mode(port);
1356         else
1357                 cp210x_disable_event_mode(port);
1358 }
1359
1360 static int cp210x_tiocmset(struct tty_struct *tty,
1361                 unsigned int set, unsigned int clear)
1362 {
1363         struct usb_serial_port *port = tty->driver_data;
1364         return cp210x_tiocmset_port(port, set, clear);
1365 }
1366
1367 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1368                 unsigned int set, unsigned int clear)
1369 {
1370         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1371         struct cp210x_flow_ctl flow_ctl;
1372         u32 ctl_hs, flow_repl;
1373         u16 control = 0;
1374         int ret;
1375
1376         mutex_lock(&port_priv->mutex);
1377
1378         if (set & TIOCM_RTS) {
1379                 port_priv->rts = true;
1380                 control |= CONTROL_RTS;
1381                 control |= CONTROL_WRITE_RTS;
1382         }
1383         if (set & TIOCM_DTR) {
1384                 port_priv->dtr = true;
1385                 control |= CONTROL_DTR;
1386                 control |= CONTROL_WRITE_DTR;
1387         }
1388         if (clear & TIOCM_RTS) {
1389                 port_priv->rts = false;
1390                 control &= ~CONTROL_RTS;
1391                 control |= CONTROL_WRITE_RTS;
1392         }
1393         if (clear & TIOCM_DTR) {
1394                 port_priv->dtr = false;
1395                 control &= ~CONTROL_DTR;
1396                 control |= CONTROL_WRITE_DTR;
1397         }
1398
1399         /*
1400          * Use SET_FLOW to set DTR and enable/disable auto-RTS when hardware
1401          * flow control is enabled.
1402          */
1403         if (port_priv->crtscts && control & CONTROL_WRITE_RTS) {
1404                 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1405                                 sizeof(flow_ctl));
1406                 if (ret)
1407                         goto out_unlock;
1408
1409                 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1410                 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1411
1412                 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1413                 if (port_priv->dtr)
1414                         ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
1415                 else
1416                         ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
1417
1418                 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1419                 if (port_priv->rts)
1420                         flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
1421                 else
1422                         flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1423
1424                 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1425                 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1426
1427                 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n",
1428                                 __func__, ctl_hs, flow_repl);
1429
1430                 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1431                                 sizeof(flow_ctl));
1432         } else {
1433                 dev_dbg(&port->dev, "%s - control = 0x%04x\n", __func__, control);
1434
1435                 ret = cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1436         }
1437 out_unlock:
1438         mutex_unlock(&port_priv->mutex);
1439
1440         return ret;
1441 }
1442
1443 static void cp210x_dtr_rts(struct usb_serial_port *port, int on)
1444 {
1445         if (on)
1446                 cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0);
1447         else
1448                 cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS);
1449 }
1450
1451 static int cp210x_tiocmget(struct tty_struct *tty)
1452 {
1453         struct usb_serial_port *port = tty->driver_data;
1454         u8 control;
1455         int result;
1456
1457         result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1458         if (result)
1459                 return result;
1460
1461         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1462                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1463                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1464                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1465                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
1466                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
1467
1468         dev_dbg(&port->dev, "%s - control = 0x%02x\n", __func__, control);
1469
1470         return result;
1471 }
1472
1473 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1474 {
1475         struct usb_serial_port *port = tty->driver_data;
1476         u16 state;
1477
1478         if (break_state == 0)
1479                 state = BREAK_OFF;
1480         else
1481                 state = BREAK_ON;
1482         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1483                 state == BREAK_OFF ? "off" : "on");
1484         cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1485 }
1486
1487 #ifdef CONFIG_GPIOLIB
1488 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1489 {
1490         struct usb_serial *serial = gpiochip_get_data(gc);
1491         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1492         u8 req_type;
1493         u16 mask;
1494         int result;
1495         int len;
1496
1497         result = usb_autopm_get_interface(serial->interface);
1498         if (result)
1499                 return result;
1500
1501         switch (priv->partnum) {
1502         case CP210X_PARTNUM_CP2105:
1503                 req_type = REQTYPE_INTERFACE_TO_HOST;
1504                 len = 1;
1505                 break;
1506         case CP210X_PARTNUM_CP2108:
1507                 req_type = REQTYPE_INTERFACE_TO_HOST;
1508                 len = 2;
1509                 break;
1510         default:
1511                 req_type = REQTYPE_DEVICE_TO_HOST;
1512                 len = 1;
1513                 break;
1514         }
1515
1516         mask = 0;
1517         result = cp210x_read_vendor_block(serial, req_type, CP210X_READ_LATCH,
1518                                           &mask, len);
1519
1520         usb_autopm_put_interface(serial->interface);
1521
1522         if (result < 0)
1523                 return result;
1524
1525         le16_to_cpus(&mask);
1526
1527         return !!(mask & BIT(gpio));
1528 }
1529
1530 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1531 {
1532         struct usb_serial *serial = gpiochip_get_data(gc);
1533         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1534         struct cp210x_gpio_write16 buf16;
1535         struct cp210x_gpio_write buf;
1536         u16 mask, state;
1537         u16 wIndex;
1538         int result;
1539
1540         if (value == 1)
1541                 state = BIT(gpio);
1542         else
1543                 state = 0;
1544
1545         mask = BIT(gpio);
1546
1547         result = usb_autopm_get_interface(serial->interface);
1548         if (result)
1549                 goto out;
1550
1551         switch (priv->partnum) {
1552         case CP210X_PARTNUM_CP2105:
1553                 buf.mask = (u8)mask;
1554                 buf.state = (u8)state;
1555                 result = cp210x_write_vendor_block(serial,
1556                                                    REQTYPE_HOST_TO_INTERFACE,
1557                                                    CP210X_WRITE_LATCH, &buf,
1558                                                    sizeof(buf));
1559                 break;
1560         case CP210X_PARTNUM_CP2108:
1561                 buf16.mask = cpu_to_le16(mask);
1562                 buf16.state = cpu_to_le16(state);
1563                 result = cp210x_write_vendor_block(serial,
1564                                                    REQTYPE_HOST_TO_INTERFACE,
1565                                                    CP210X_WRITE_LATCH, &buf16,
1566                                                    sizeof(buf16));
1567                 break;
1568         default:
1569                 wIndex = state << 8 | mask;
1570                 result = usb_control_msg(serial->dev,
1571                                          usb_sndctrlpipe(serial->dev, 0),
1572                                          CP210X_VENDOR_SPECIFIC,
1573                                          REQTYPE_HOST_TO_DEVICE,
1574                                          CP210X_WRITE_LATCH,
1575                                          wIndex,
1576                                          NULL, 0, USB_CTRL_SET_TIMEOUT);
1577                 break;
1578         }
1579
1580         usb_autopm_put_interface(serial->interface);
1581 out:
1582         if (result < 0) {
1583                 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n",
1584                                 result);
1585         }
1586 }
1587
1588 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1589 {
1590         struct usb_serial *serial = gpiochip_get_data(gc);
1591         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1592
1593         return priv->gpio_input & BIT(gpio);
1594 }
1595
1596 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1597 {
1598         struct usb_serial *serial = gpiochip_get_data(gc);
1599         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1600
1601         if (priv->partnum == CP210X_PARTNUM_CP2105) {
1602                 /* hardware does not support an input mode */
1603                 return -ENOTSUPP;
1604         }
1605
1606         /* push-pull pins cannot be changed to be inputs */
1607         if (priv->gpio_pushpull & BIT(gpio))
1608                 return -EINVAL;
1609
1610         /* make sure to release pin if it is being driven low */
1611         cp210x_gpio_set(gc, gpio, 1);
1612
1613         priv->gpio_input |= BIT(gpio);
1614
1615         return 0;
1616 }
1617
1618 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1619                                         int value)
1620 {
1621         struct usb_serial *serial = gpiochip_get_data(gc);
1622         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1623
1624         priv->gpio_input &= ~BIT(gpio);
1625         cp210x_gpio_set(gc, gpio, value);
1626
1627         return 0;
1628 }
1629
1630 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1631                                   unsigned long config)
1632 {
1633         struct usb_serial *serial = gpiochip_get_data(gc);
1634         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1635         enum pin_config_param param = pinconf_to_config_param(config);
1636
1637         /* Succeed only if in correct mode (this can't be set at runtime) */
1638         if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1639             (priv->gpio_pushpull & BIT(gpio)))
1640                 return 0;
1641
1642         if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1643             !(priv->gpio_pushpull & BIT(gpio)))
1644                 return 0;
1645
1646         return -ENOTSUPP;
1647 }
1648
1649 static int cp210x_gpio_init_valid_mask(struct gpio_chip *gc,
1650                 unsigned long *valid_mask, unsigned int ngpios)
1651 {
1652         struct usb_serial *serial = gpiochip_get_data(gc);
1653         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1654         struct device *dev = &serial->interface->dev;
1655         unsigned long altfunc_mask = priv->gpio_altfunc;
1656
1657         bitmap_complement(valid_mask, &altfunc_mask, ngpios);
1658
1659         if (bitmap_empty(valid_mask, ngpios))
1660                 dev_dbg(dev, "no pin configured for GPIO\n");
1661         else
1662                 dev_dbg(dev, "GPIO.%*pbl configured for GPIO\n", ngpios,
1663                                 valid_mask);
1664         return 0;
1665 }
1666
1667 /*
1668  * This function is for configuring GPIO using shared pins, where other signals
1669  * are made unavailable by configuring the use of GPIO. This is believed to be
1670  * only applicable to the cp2105 at this point, the other devices supported by
1671  * this driver that provide GPIO do so in a way that does not impact other
1672  * signals and are thus expected to have very different initialisation.
1673  */
1674 static int cp2105_gpioconf_init(struct usb_serial *serial)
1675 {
1676         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1677         struct cp210x_pin_mode mode;
1678         struct cp210x_dual_port_config config;
1679         u8 intf_num = cp210x_interface_num(serial);
1680         u8 iface_config;
1681         int result;
1682
1683         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1684                                           CP210X_GET_DEVICEMODE, &mode,
1685                                           sizeof(mode));
1686         if (result < 0)
1687                 return result;
1688
1689         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1690                                           CP210X_GET_PORTCONFIG, &config,
1691                                           sizeof(config));
1692         if (result < 0)
1693                 return result;
1694
1695         /*  2 banks of GPIO - One for the pins taken from each serial port */
1696         if (intf_num == 0) {
1697                 if (mode.eci == CP210X_PIN_MODE_MODEM) {
1698                         /* mark all GPIOs of this interface as reserved */
1699                         priv->gpio_altfunc = 0xff;
1700                         return 0;
1701                 }
1702
1703                 iface_config = config.eci_cfg;
1704                 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1705                                                 CP210X_ECI_GPIO_MODE_MASK) >>
1706                                                 CP210X_ECI_GPIO_MODE_OFFSET);
1707                 priv->gc.ngpio = 2;
1708         } else if (intf_num == 1) {
1709                 if (mode.sci == CP210X_PIN_MODE_MODEM) {
1710                         /* mark all GPIOs of this interface as reserved */
1711                         priv->gpio_altfunc = 0xff;
1712                         return 0;
1713                 }
1714
1715                 iface_config = config.sci_cfg;
1716                 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1717                                                 CP210X_SCI_GPIO_MODE_MASK) >>
1718                                                 CP210X_SCI_GPIO_MODE_OFFSET);
1719                 priv->gc.ngpio = 3;
1720         } else {
1721                 return -ENODEV;
1722         }
1723
1724         /* mark all pins which are not in GPIO mode */
1725         if (iface_config & CP2105_GPIO0_TXLED_MODE)     /* GPIO 0 */
1726                 priv->gpio_altfunc |= BIT(0);
1727         if (iface_config & (CP2105_GPIO1_RXLED_MODE |   /* GPIO 1 */
1728                         CP2105_GPIO1_RS485_MODE))
1729                 priv->gpio_altfunc |= BIT(1);
1730
1731         /* driver implementation for CP2105 only supports outputs */
1732         priv->gpio_input = 0;
1733
1734         return 0;
1735 }
1736
1737 static int cp2104_gpioconf_init(struct usb_serial *serial)
1738 {
1739         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1740         struct cp210x_single_port_config config;
1741         u8 iface_config;
1742         u8 gpio_latch;
1743         int result;
1744         u8 i;
1745
1746         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1747                                           CP210X_GET_PORTCONFIG, &config,
1748                                           sizeof(config));
1749         if (result < 0)
1750                 return result;
1751
1752         priv->gc.ngpio = 4;
1753
1754         iface_config = config.device_cfg;
1755         priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1756                                         CP210X_GPIO_MODE_MASK) >>
1757                                         CP210X_GPIO_MODE_OFFSET);
1758         gpio_latch = (u8)((le16_to_cpu(config.reset_state) &
1759                                         CP210X_GPIO_MODE_MASK) >>
1760                                         CP210X_GPIO_MODE_OFFSET);
1761
1762         /* mark all pins which are not in GPIO mode */
1763         if (iface_config & CP2104_GPIO0_TXLED_MODE)     /* GPIO 0 */
1764                 priv->gpio_altfunc |= BIT(0);
1765         if (iface_config & CP2104_GPIO1_RXLED_MODE)     /* GPIO 1 */
1766                 priv->gpio_altfunc |= BIT(1);
1767         if (iface_config & CP2104_GPIO2_RS485_MODE)     /* GPIO 2 */
1768                 priv->gpio_altfunc |= BIT(2);
1769
1770         /*
1771          * Like CP2102N, CP2104 has also no strict input and output pin
1772          * modes.
1773          * Do the same input mode emulation as CP2102N.
1774          */
1775         for (i = 0; i < priv->gc.ngpio; ++i) {
1776                 /*
1777                  * Set direction to "input" iff pin is open-drain and reset
1778                  * value is 1.
1779                  */
1780                 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1781                         priv->gpio_input |= BIT(i);
1782         }
1783
1784         return 0;
1785 }
1786
1787 static int cp2108_gpio_init(struct usb_serial *serial)
1788 {
1789         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1790         struct cp210x_quad_port_config config;
1791         u16 gpio_latch;
1792         int result;
1793         u8 i;
1794
1795         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1796                                           CP210X_GET_PORTCONFIG, &config,
1797                                           sizeof(config));
1798         if (result < 0)
1799                 return result;
1800
1801         priv->gc.ngpio = 16;
1802         priv->gpio_pushpull = le16_to_cpu(config.reset_state.gpio_mode_pb1);
1803         gpio_latch = le16_to_cpu(config.reset_state.gpio_latch_pb1);
1804
1805         /*
1806          * Mark all pins which are not in GPIO mode.
1807          *
1808          * Refer to table 9.1 "GPIO Mode alternate Functions" in the datasheet:
1809          * https://www.silabs.com/documents/public/data-sheets/cp2108-datasheet.pdf
1810          *
1811          * Alternate functions of GPIO0 to GPIO3 are determine by enhancedfxn_ifc[0]
1812          * and the similarly for the other pins; enhancedfxn_ifc[1]: GPIO4 to GPIO7,
1813          * enhancedfxn_ifc[2]: GPIO8 to GPIO11, enhancedfxn_ifc[3]: GPIO12 to GPIO15.
1814          */
1815         for (i = 0; i < 4; i++) {
1816                 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_TXLED)
1817                         priv->gpio_altfunc |= BIT(i * 4);
1818                 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RXLED)
1819                         priv->gpio_altfunc |= BIT((i * 4) + 1);
1820                 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RS485)
1821                         priv->gpio_altfunc |= BIT((i * 4) + 2);
1822                 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_CLOCK)
1823                         priv->gpio_altfunc |= BIT((i * 4) + 3);
1824         }
1825
1826         /*
1827          * Like CP2102N, CP2108 has also no strict input and output pin
1828          * modes. Do the same input mode emulation as CP2102N.
1829          */
1830         for (i = 0; i < priv->gc.ngpio; ++i) {
1831                 /*
1832                  * Set direction to "input" iff pin is open-drain and reset
1833                  * value is 1.
1834                  */
1835                 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1836                         priv->gpio_input |= BIT(i);
1837         }
1838
1839         return 0;
1840 }
1841
1842 static int cp2102n_gpioconf_init(struct usb_serial *serial)
1843 {
1844         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1845         const u16 config_size = 0x02a6;
1846         u8 gpio_rst_latch;
1847         u8 config_version;
1848         u8 gpio_pushpull;
1849         u8 *config_buf;
1850         u8 gpio_latch;
1851         u8 gpio_ctrl;
1852         int result;
1853         u8 i;
1854
1855         /*
1856          * Retrieve device configuration from the device.
1857          * The array received contains all customization settings done at the
1858          * factory/manufacturer. Format of the array is documented at the
1859          * time of writing at:
1860          * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa
1861          */
1862         config_buf = kmalloc(config_size, GFP_KERNEL);
1863         if (!config_buf)
1864                 return -ENOMEM;
1865
1866         result = cp210x_read_vendor_block(serial,
1867                                           REQTYPE_DEVICE_TO_HOST,
1868                                           CP210X_READ_2NCONFIG,
1869                                           config_buf,
1870                                           config_size);
1871         if (result < 0) {
1872                 kfree(config_buf);
1873                 return result;
1874         }
1875
1876         config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX];
1877         gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX];
1878         gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX];
1879         gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX];
1880
1881         kfree(config_buf);
1882
1883         /* Make sure this is a config format we understand. */
1884         if (config_version != 0x01)
1885                 return -ENOTSUPP;
1886
1887         priv->gc.ngpio = 4;
1888
1889         /*
1890          * Get default pin states after reset. Needed so we can determine
1891          * the direction of an open-drain pin.
1892          */
1893         gpio_latch = (gpio_rst_latch >> 3) & 0x0f;
1894
1895         /* 0 indicates open-drain mode, 1 is push-pull */
1896         priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f;
1897
1898         /* 0 indicates GPIO mode, 1 is alternate function */
1899         if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) {
1900                 /* QFN20 is special... */
1901                 if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE)   /* GPIO 0 */
1902                         priv->gpio_altfunc |= BIT(0);
1903                 if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */
1904                         priv->gpio_altfunc |= BIT(1);
1905                 if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */
1906                         priv->gpio_altfunc |= BIT(2);
1907                 if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */
1908                         priv->gpio_altfunc |= BIT(3);
1909         } else {
1910                 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f;
1911         }
1912
1913         if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) {
1914                 /*
1915                  * For the QFN28 package, GPIO4-6 are controlled by
1916                  * the low three bits of the mode/latch fields.
1917                  * Contrary to the document linked above, the bits for
1918                  * the SUSPEND pins are elsewhere.  No alternate
1919                  * function is available for these pins.
1920                  */
1921                 priv->gc.ngpio = 7;
1922                 gpio_latch |= (gpio_rst_latch & 7) << 4;
1923                 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4;
1924         }
1925
1926         /*
1927          * The CP2102N does not strictly has input and output pin modes,
1928          * it only knows open-drain and push-pull modes which is set at
1929          * factory. An open-drain pin can function both as an
1930          * input or an output. We emulate input mode for open-drain pins
1931          * by making sure they are not driven low, and we do not allow
1932          * push-pull pins to be set as an input.
1933          */
1934         for (i = 0; i < priv->gc.ngpio; ++i) {
1935                 /*
1936                  * Set direction to "input" iff pin is open-drain and reset
1937                  * value is 1.
1938                  */
1939                 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1940                         priv->gpio_input |= BIT(i);
1941         }
1942
1943         return 0;
1944 }
1945
1946 static int cp210x_gpio_init(struct usb_serial *serial)
1947 {
1948         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1949         int result;
1950
1951         switch (priv->partnum) {
1952         case CP210X_PARTNUM_CP2104:
1953                 result = cp2104_gpioconf_init(serial);
1954                 break;
1955         case CP210X_PARTNUM_CP2105:
1956                 result = cp2105_gpioconf_init(serial);
1957                 break;
1958         case CP210X_PARTNUM_CP2108:
1959                 /*
1960                  * The GPIOs are not tied to any specific port so only register
1961                  * once for interface 0.
1962                  */
1963                 if (cp210x_interface_num(serial) != 0)
1964                         return 0;
1965                 result = cp2108_gpio_init(serial);
1966                 break;
1967         case CP210X_PARTNUM_CP2102N_QFN28:
1968         case CP210X_PARTNUM_CP2102N_QFN24:
1969         case CP210X_PARTNUM_CP2102N_QFN20:
1970                 result = cp2102n_gpioconf_init(serial);
1971                 break;
1972         default:
1973                 return 0;
1974         }
1975
1976         if (result < 0)
1977                 return result;
1978
1979         priv->gc.label = "cp210x";
1980         priv->gc.get_direction = cp210x_gpio_direction_get;
1981         priv->gc.direction_input = cp210x_gpio_direction_input;
1982         priv->gc.direction_output = cp210x_gpio_direction_output;
1983         priv->gc.get = cp210x_gpio_get;
1984         priv->gc.set = cp210x_gpio_set;
1985         priv->gc.set_config = cp210x_gpio_set_config;
1986         priv->gc.init_valid_mask = cp210x_gpio_init_valid_mask;
1987         priv->gc.owner = THIS_MODULE;
1988         priv->gc.parent = &serial->interface->dev;
1989         priv->gc.base = -1;
1990         priv->gc.can_sleep = true;
1991
1992         result = gpiochip_add_data(&priv->gc, serial);
1993         if (!result)
1994                 priv->gpio_registered = true;
1995
1996         return result;
1997 }
1998
1999 static void cp210x_gpio_remove(struct usb_serial *serial)
2000 {
2001         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2002
2003         if (priv->gpio_registered) {
2004                 gpiochip_remove(&priv->gc);
2005                 priv->gpio_registered = false;
2006         }
2007 }
2008
2009 #else
2010
2011 static int cp210x_gpio_init(struct usb_serial *serial)
2012 {
2013         return 0;
2014 }
2015
2016 static void cp210x_gpio_remove(struct usb_serial *serial)
2017 {
2018         /* Nothing to do */
2019 }
2020
2021 #endif
2022
2023 static int cp210x_port_probe(struct usb_serial_port *port)
2024 {
2025         struct usb_serial *serial = port->serial;
2026         struct cp210x_port_private *port_priv;
2027
2028         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
2029         if (!port_priv)
2030                 return -ENOMEM;
2031
2032         port_priv->bInterfaceNumber = cp210x_interface_num(serial);
2033         mutex_init(&port_priv->mutex);
2034
2035         usb_set_serial_port_data(port, port_priv);
2036
2037         return 0;
2038 }
2039
2040 static void cp210x_port_remove(struct usb_serial_port *port)
2041 {
2042         struct cp210x_port_private *port_priv;
2043
2044         port_priv = usb_get_serial_port_data(port);
2045         kfree(port_priv);
2046 }
2047
2048 static void cp210x_init_max_speed(struct usb_serial *serial)
2049 {
2050         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2051         bool use_actual_rate = false;
2052         speed_t min = 300;
2053         speed_t max;
2054
2055         switch (priv->partnum) {
2056         case CP210X_PARTNUM_CP2101:
2057                 max = 921600;
2058                 break;
2059         case CP210X_PARTNUM_CP2102:
2060         case CP210X_PARTNUM_CP2103:
2061                 max = 1000000;
2062                 break;
2063         case CP210X_PARTNUM_CP2104:
2064                 use_actual_rate = true;
2065                 max = 2000000;
2066                 break;
2067         case CP210X_PARTNUM_CP2108:
2068                 max = 2000000;
2069                 break;
2070         case CP210X_PARTNUM_CP2105:
2071                 if (cp210x_interface_num(serial) == 0) {
2072                         use_actual_rate = true;
2073                         max = 2000000;  /* ECI */
2074                 } else {
2075                         min = 2400;
2076                         max = 921600;   /* SCI */
2077                 }
2078                 break;
2079         case CP210X_PARTNUM_CP2102N_QFN28:
2080         case CP210X_PARTNUM_CP2102N_QFN24:
2081         case CP210X_PARTNUM_CP2102N_QFN20:
2082                 use_actual_rate = true;
2083                 max = 3000000;
2084                 break;
2085         default:
2086                 max = 2000000;
2087                 break;
2088         }
2089
2090         priv->min_speed = min;
2091         priv->max_speed = max;
2092         priv->use_actual_rate = use_actual_rate;
2093 }
2094
2095 static int cp210x_get_fw_version(struct usb_serial *serial, u16 value)
2096 {
2097         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2098         u8 ver[3];
2099         int ret;
2100
2101         ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, value,
2102                         ver, sizeof(ver));
2103         if (ret)
2104                 return ret;
2105
2106         dev_dbg(&serial->interface->dev, "%s - %d.%d.%d\n", __func__,
2107                         ver[0], ver[1], ver[2]);
2108
2109         priv->fw_version = ver[0] << 16 | ver[1] << 8 | ver[2];
2110
2111         return 0;
2112 }
2113
2114 static void cp210x_determine_quirks(struct usb_serial *serial)
2115 {
2116         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2117         int ret;
2118
2119         switch (priv->partnum) {
2120         case CP210X_PARTNUM_CP2102N_QFN28:
2121         case CP210X_PARTNUM_CP2102N_QFN24:
2122         case CP210X_PARTNUM_CP2102N_QFN20:
2123                 ret = cp210x_get_fw_version(serial, CP210X_GET_FW_VER_2N);
2124                 if (ret)
2125                         break;
2126                 if (priv->fw_version <= 0x10004)
2127                         priv->no_flow_control = true;
2128                 break;
2129         default:
2130                 break;
2131         }
2132 }
2133
2134 static int cp210x_attach(struct usb_serial *serial)
2135 {
2136         int result;
2137         struct cp210x_serial_private *priv;
2138
2139         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2140         if (!priv)
2141                 return -ENOMEM;
2142
2143         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
2144                                           CP210X_GET_PARTNUM, &priv->partnum,
2145                                           sizeof(priv->partnum));
2146         if (result < 0) {
2147                 dev_warn(&serial->interface->dev,
2148                          "querying part number failed\n");
2149                 priv->partnum = CP210X_PARTNUM_UNKNOWN;
2150         }
2151
2152         usb_set_serial_data(serial, priv);
2153
2154         cp210x_determine_quirks(serial);
2155         cp210x_init_max_speed(serial);
2156
2157         result = cp210x_gpio_init(serial);
2158         if (result < 0) {
2159                 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n",
2160                                 result);
2161         }
2162
2163         return 0;
2164 }
2165
2166 static void cp210x_disconnect(struct usb_serial *serial)
2167 {
2168         cp210x_gpio_remove(serial);
2169 }
2170
2171 static void cp210x_release(struct usb_serial *serial)
2172 {
2173         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2174
2175         cp210x_gpio_remove(serial);
2176
2177         kfree(priv);
2178 }
2179
2180 module_usb_serial_driver(serial_drivers, id_table);
2181
2182 MODULE_DESCRIPTION(DRIVER_DESC);
2183 MODULE_LICENSE("GPL v2");