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 (craig@microtron.org.uk)
   6  * Copyright (C) 2010-2021 Johan Hovold (johan@kernel.org)
   7  *
   8  * Support to set flow control line levels using TIOCMGET and TIOCMSET
   9  * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
  10  * control thanks to Munir Nassar nassarmu@real-time.com
  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(0x2184, 0x0030) }, /* GW Instek GDM-834x Digital Multimeter */
 237         { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
 238         { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
 239         { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
 240         { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
 241         { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
 242         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 243         { } /* Terminating Entry */
 244 };
 245
 246 MODULE_DEVICE_TABLE(usb, id_table);
 247
 248 struct cp210x_serial_private {
 249 #ifdef CONFIG_GPIOLIB
 250         struct gpio_chip        gc;
 251         bool                    gpio_registered;
 252         u16                     gpio_pushpull;
 253         u16                     gpio_altfunc;
 254         u16                     gpio_input;
 255 #endif
 256         u8                      partnum;
 257         u32                     fw_version;
 258         speed_t                 min_speed;
 259         speed_t                 max_speed;
 260         bool                    use_actual_rate;
 261         bool                    no_flow_control;
 262         bool                    no_event_mode;
 263 };
 264
 265 enum cp210x_event_state {
 266         ES_DATA,
 267         ES_ESCAPE,
 268         ES_LSR,
 269         ES_LSR_DATA_0,
 270         ES_LSR_DATA_1,
 271         ES_MSR
 272 };
 273
 274 struct cp210x_port_private {
 275         u8                      bInterfaceNumber;
 276         bool                    event_mode;
 277         enum cp210x_event_state event_state;
 278         u8                      lsr;
 279
 280         struct mutex            mutex;
 281         bool                    crtscts;
 282         bool                    dtr;
 283         bool                    rts;
 284 };
 285
 286 static struct usb_serial_driver cp210x_device = {
 287         .driver = {
 288                 .owner =        THIS_MODULE,
 289                 .name =         "cp210x",
 290         },
 291         .id_table               = id_table,
 292         .num_ports              = 1,
 293         .bulk_in_size           = 256,
 294         .bulk_out_size          = 256,
 295         .open                   = cp210x_open,
 296         .close                  = cp210x_close,
 297         .break_ctl              = cp210x_break_ctl,
 298         .set_termios            = cp210x_set_termios,
 299         .tx_empty               = cp210x_tx_empty,
 300         .throttle               = usb_serial_generic_throttle,
 301         .unthrottle             = usb_serial_generic_unthrottle,
 302         .tiocmget               = cp210x_tiocmget,
 303         .tiocmset               = cp210x_tiocmset,
 304         .get_icount             = usb_serial_generic_get_icount,
 305         .attach                 = cp210x_attach,
 306         .disconnect             = cp210x_disconnect,
 307         .release                = cp210x_release,
 308         .port_probe             = cp210x_port_probe,
 309         .port_remove            = cp210x_port_remove,
 310         .dtr_rts                = cp210x_dtr_rts,
 311         .process_read_urb       = cp210x_process_read_urb,
 312 };
 313
 314 static struct usb_serial_driver * const serial_drivers[] = {
 315         &cp210x_device, NULL
 316 };
 317
 318 /* Config request types */
 319 #define REQTYPE_HOST_TO_INTERFACE       0x41
 320 #define REQTYPE_INTERFACE_TO_HOST       0xc1
 321 #define REQTYPE_HOST_TO_DEVICE  0x40
 322 #define REQTYPE_DEVICE_TO_HOST  0xc0
 323
 324 /* Config request codes */
 325 #define CP210X_IFC_ENABLE       0x00
 326 #define CP210X_SET_BAUDDIV      0x01
 327 #define CP210X_GET_BAUDDIV      0x02
 328 #define CP210X_SET_LINE_CTL     0x03
 329 #define CP210X_GET_LINE_CTL     0x04
 330 #define CP210X_SET_BREAK        0x05
 331 #define CP210X_IMM_CHAR         0x06
 332 #define CP210X_SET_MHS          0x07
 333 #define CP210X_GET_MDMSTS       0x08
 334 #define CP210X_SET_XON          0x09
 335 #define CP210X_SET_XOFF         0x0A
 336 #define CP210X_SET_EVENTMASK    0x0B
 337 #define CP210X_GET_EVENTMASK    0x0C
 338 #define CP210X_SET_CHAR         0x0D
 339 #define CP210X_GET_CHARS        0x0E
 340 #define CP210X_GET_PROPS        0x0F
 341 #define CP210X_GET_COMM_STATUS  0x10
 342 #define CP210X_RESET            0x11
 343 #define CP210X_PURGE            0x12
 344 #define CP210X_SET_FLOW         0x13
 345 #define CP210X_GET_FLOW         0x14
 346 #define CP210X_EMBED_EVENTS     0x15
 347 #define CP210X_GET_EVENTSTATE   0x16
 348 #define CP210X_SET_CHARS        0x19
 349 #define CP210X_GET_BAUDRATE     0x1D
 350 #define CP210X_SET_BAUDRATE     0x1E
 351 #define CP210X_VENDOR_SPECIFIC  0xFF
 352
 353 /* CP210X_IFC_ENABLE */
 354 #define UART_ENABLE             0x0001
 355 #define UART_DISABLE            0x0000
 356
 357 /* CP210X_(SET|GET)_BAUDDIV */
 358 #define BAUD_RATE_GEN_FREQ      0x384000
 359
 360 /* CP210X_(SET|GET)_LINE_CTL */
 361 #define BITS_DATA_MASK          0X0f00
 362 #define BITS_DATA_5             0X0500
 363 #define BITS_DATA_6             0X0600
 364 #define BITS_DATA_7             0X0700
 365 #define BITS_DATA_8             0X0800
 366 #define BITS_DATA_9             0X0900
 367
 368 #define BITS_PARITY_MASK        0x00f0
 369 #define BITS_PARITY_NONE        0x0000
 370 #define BITS_PARITY_ODD         0x0010
 371 #define BITS_PARITY_EVEN        0x0020
 372 #define BITS_PARITY_MARK        0x0030
 373 #define BITS_PARITY_SPACE       0x0040
 374
 375 #define BITS_STOP_MASK          0x000f
 376 #define BITS_STOP_1             0x0000
 377 #define BITS_STOP_1_5           0x0001
 378 #define BITS_STOP_2             0x0002
 379
 380 /* CP210X_SET_BREAK */
 381 #define BREAK_ON                0x0001
 382 #define BREAK_OFF               0x0000
 383
 384 /* CP210X_(SET_MHS|GET_MDMSTS) */
 385 #define CONTROL_DTR             0x0001
 386 #define CONTROL_RTS             0x0002
 387 #define CONTROL_CTS             0x0010
 388 #define CONTROL_DSR             0x0020
 389 #define CONTROL_RING            0x0040
 390 #define CONTROL_DCD             0x0080
 391 #define CONTROL_WRITE_DTR       0x0100
 392 #define CONTROL_WRITE_RTS       0x0200
 393
 394 /* CP210X_(GET|SET)_CHARS */
 395 struct cp210x_special_chars {
 396         u8      bEofChar;
 397         u8      bErrorChar;
 398         u8      bBreakChar;
 399         u8      bEventChar;
 400         u8      bXonChar;
 401         u8      bXoffChar;
 402 };
 403
 404 /* CP210X_VENDOR_SPECIFIC values */
 405 #define CP210X_GET_FW_VER       0x000E
 406 #define CP210X_READ_2NCONFIG    0x000E
 407 #define CP210X_GET_FW_VER_2N    0x0010
 408 #define CP210X_READ_LATCH       0x00C2
 409 #define CP210X_GET_PARTNUM      0x370B
 410 #define CP210X_GET_PORTCONFIG   0x370C
 411 #define CP210X_GET_DEVICEMODE   0x3711
 412 #define CP210X_WRITE_LATCH      0x37E1
 413
 414 /* Part number definitions */
 415 #define CP210X_PARTNUM_CP2101   0x01
 416 #define CP210X_PARTNUM_CP2102   0x02
 417 #define CP210X_PARTNUM_CP2103   0x03
 418 #define CP210X_PARTNUM_CP2104   0x04
 419 #define CP210X_PARTNUM_CP2105   0x05
 420 #define CP210X_PARTNUM_CP2108   0x08
 421 #define CP210X_PARTNUM_CP2102N_QFN28    0x20
 422 #define CP210X_PARTNUM_CP2102N_QFN24    0x21
 423 #define CP210X_PARTNUM_CP2102N_QFN20    0x22
 424 #define CP210X_PARTNUM_UNKNOWN  0xFF
 425
 426 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
 427 struct cp210x_comm_status {
 428         __le32   ulErrors;
 429         __le32   ulHoldReasons;
 430         __le32   ulAmountInInQueue;
 431         __le32   ulAmountInOutQueue;
 432         u8       bEofReceived;
 433         u8       bWaitForImmediate;
 434         u8       bReserved;
 435 } __packed;
 436
 437 /*
 438  * CP210X_PURGE - 16 bits passed in wValue of USB request.
 439  * SiLabs app note AN571 gives a strange description of the 4 bits:
 440  * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
 441  * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
 442  */
 443 #define PURGE_ALL               0x000f
 444
 445 /* CP210X_EMBED_EVENTS */
 446 #define CP210X_ESCCHAR          0xec
 447
 448 #define CP210X_LSR_OVERRUN      BIT(1)
 449 #define CP210X_LSR_PARITY       BIT(2)
 450 #define CP210X_LSR_FRAME        BIT(3)
 451 #define CP210X_LSR_BREAK        BIT(4)
 452
 453
 454 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
 455 struct cp210x_flow_ctl {
 456         __le32  ulControlHandshake;
 457         __le32  ulFlowReplace;
 458         __le32  ulXonLimit;
 459         __le32  ulXoffLimit;
 460 };
 461
 462 /* cp210x_flow_ctl::ulControlHandshake */
 463 #define CP210X_SERIAL_DTR_MASK          GENMASK(1, 0)
 464 #define CP210X_SERIAL_DTR_INACTIVE      (0 << 0)
 465 #define CP210X_SERIAL_DTR_ACTIVE        (1 << 0)
 466 #define CP210X_SERIAL_DTR_FLOW_CTL      (2 << 0)
 467 #define CP210X_SERIAL_CTS_HANDSHAKE     BIT(3)
 468 #define CP210X_SERIAL_DSR_HANDSHAKE     BIT(4)
 469 #define CP210X_SERIAL_DCD_HANDSHAKE     BIT(5)
 470 #define CP210X_SERIAL_DSR_SENSITIVITY   BIT(6)
 471
 472 /* cp210x_flow_ctl::ulFlowReplace */
 473 #define CP210X_SERIAL_AUTO_TRANSMIT     BIT(0)
 474 #define CP210X_SERIAL_AUTO_RECEIVE      BIT(1)
 475 #define CP210X_SERIAL_ERROR_CHAR        BIT(2)
 476 #define CP210X_SERIAL_NULL_STRIPPING    BIT(3)
 477 #define CP210X_SERIAL_BREAK_CHAR        BIT(4)
 478 #define CP210X_SERIAL_RTS_MASK          GENMASK(7, 6)
 479 #define CP210X_SERIAL_RTS_INACTIVE      (0 << 6)
 480 #define CP210X_SERIAL_RTS_ACTIVE        (1 << 6)
 481 #define CP210X_SERIAL_RTS_FLOW_CTL      (2 << 6)
 482 #define CP210X_SERIAL_XOFF_CONTINUE     BIT(31)
 483
 484 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
 485 struct cp210x_pin_mode {
 486         u8      eci;
 487         u8      sci;
 488 };
 489
 490 #define CP210X_PIN_MODE_MODEM           0
 491 #define CP210X_PIN_MODE_GPIO            BIT(0)
 492
 493 /*
 494  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes
 495  * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes.
 496  */
 497 struct cp210x_dual_port_config {
 498         __le16  gpio_mode;
 499         u8      __pad0[2];
 500         __le16  reset_state;
 501         u8      __pad1[4];
 502         __le16  suspend_state;
 503         u8      sci_cfg;
 504         u8      eci_cfg;
 505         u8      device_cfg;
 506 } __packed;
 507
 508 /*
 509  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes
 510  * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes.
 511  */
 512 struct cp210x_single_port_config {
 513         __le16  gpio_mode;
 514         u8      __pad0[2];
 515         __le16  reset_state;
 516         u8      __pad1[4];
 517         __le16  suspend_state;
 518         u8      device_cfg;
 519 } __packed;
 520
 521 /* GPIO modes */
 522 #define CP210X_SCI_GPIO_MODE_OFFSET     9
 523 #define CP210X_SCI_GPIO_MODE_MASK       GENMASK(11, 9)
 524
 525 #define CP210X_ECI_GPIO_MODE_OFFSET     2
 526 #define CP210X_ECI_GPIO_MODE_MASK       GENMASK(3, 2)
 527
 528 #define CP210X_GPIO_MODE_OFFSET         8
 529 #define CP210X_GPIO_MODE_MASK           GENMASK(11, 8)
 530
 531 /* CP2105 port configuration values */
 532 #define CP2105_GPIO0_TXLED_MODE         BIT(0)
 533 #define CP2105_GPIO1_RXLED_MODE         BIT(1)
 534 #define CP2105_GPIO1_RS485_MODE         BIT(2)
 535
 536 /* CP2104 port configuration values */
 537 #define CP2104_GPIO0_TXLED_MODE         BIT(0)
 538 #define CP2104_GPIO1_RXLED_MODE         BIT(1)
 539 #define CP2104_GPIO2_RS485_MODE         BIT(2)
 540
 541 struct cp210x_quad_port_state {
 542         __le16 gpio_mode_pb0;
 543         __le16 gpio_mode_pb1;
 544         __le16 gpio_mode_pb2;
 545         __le16 gpio_mode_pb3;
 546         __le16 gpio_mode_pb4;
 547
 548         __le16 gpio_lowpower_pb0;
 549         __le16 gpio_lowpower_pb1;
 550         __le16 gpio_lowpower_pb2;
 551         __le16 gpio_lowpower_pb3;
 552         __le16 gpio_lowpower_pb4;
 553
 554         __le16 gpio_latch_pb0;
 555         __le16 gpio_latch_pb1;
 556         __le16 gpio_latch_pb2;
 557         __le16 gpio_latch_pb3;
 558         __le16 gpio_latch_pb4;
 559 };
 560
 561 /*
 562  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0x49 bytes
 563  * on a CP2108 chip.
 564  *
 565  * See https://www.silabs.com/documents/public/application-notes/an978-cp210x-usb-to-uart-api-specification.pdf
 566  */
 567 struct cp210x_quad_port_config {
 568         struct cp210x_quad_port_state reset_state;
 569         struct cp210x_quad_port_state suspend_state;
 570         u8 ipdelay_ifc[4];
 571         u8 enhancedfxn_ifc[4];
 572         u8 enhancedfxn_device;
 573         u8 extclkfreq[4];
 574 } __packed;
 575
 576 #define CP2108_EF_IFC_GPIO_TXLED                0x01
 577 #define CP2108_EF_IFC_GPIO_RXLED                0x02
 578 #define CP2108_EF_IFC_GPIO_RS485                0x04
 579 #define CP2108_EF_IFC_GPIO_RS485_LOGIC          0x08
 580 #define CP2108_EF_IFC_GPIO_CLOCK                0x10
 581 #define CP2108_EF_IFC_DYNAMIC_SUSPEND           0x40
 582
 583 /* CP2102N configuration array indices */
 584 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX      2
 585 #define CP210X_2NCONFIG_GPIO_MODE_IDX           581
 586 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX       587
 587 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX        600
 588
 589 /* CP2102N QFN20 port configuration values */
 590 #define CP2102N_QFN20_GPIO2_TXLED_MODE          BIT(2)
 591 #define CP2102N_QFN20_GPIO3_RXLED_MODE          BIT(3)
 592 #define CP2102N_QFN20_GPIO1_RS485_MODE          BIT(4)
 593 #define CP2102N_QFN20_GPIO0_CLK_MODE            BIT(6)
 594
 595 /*
 596  * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x02 bytes
 597  * for CP2102N, CP2103, CP2104 and CP2105.
 598  */
 599 struct cp210x_gpio_write {
 600         u8      mask;
 601         u8      state;
 602 };
 603
 604 /*
 605  * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x04 bytes
 606  * for CP2108.
 607  */
 608 struct cp210x_gpio_write16 {
 609         __le16  mask;
 610         __le16  state;
 611 };
 612
 613 /*
 614  * Helper to get interface number when we only have struct usb_serial.
 615  */
 616 static u8 cp210x_interface_num(struct usb_serial *serial)
 617 {
 618         struct usb_host_interface *cur_altsetting;
 619
 620         cur_altsetting = serial->interface->cur_altsetting;
 621
 622         return cur_altsetting->desc.bInterfaceNumber;
 623 }
 624
 625 /*
 626  * Reads a variable-sized block of CP210X_ registers, identified by req.
 627  * Returns data into buf in native USB byte order.
 628  */
 629 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
 630                 void *buf, int bufsize)
 631 {
 632         struct usb_serial *serial = port->serial;
 633         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 634         void *dmabuf;
 635         int result;
 636
 637         dmabuf = kmalloc(bufsize, GFP_KERNEL);
 638         if (!dmabuf)
 639                 return -ENOMEM;
 640
 641         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 642                         req, REQTYPE_INTERFACE_TO_HOST, 0,
 643                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 644                         USB_CTRL_GET_TIMEOUT);
 645         if (result == bufsize) {
 646                 memcpy(buf, dmabuf, bufsize);
 647                 result = 0;
 648         } else {
 649                 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
 650                                 req, bufsize, result);
 651                 if (result >= 0)
 652                         result = -EIO;
 653         }
 654
 655         kfree(dmabuf);
 656
 657         return result;
 658 }
 659
 660 /*
 661  * Reads any 8-bit CP210X_ register identified by req.
 662  */
 663 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
 664 {
 665         return cp210x_read_reg_block(port, req, val, sizeof(*val));
 666 }
 667
 668 /*
 669  * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
 670  * Returns data into buf in native USB byte order.
 671  */
 672 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
 673                                     void *buf, int bufsize)
 674 {
 675         void *dmabuf;
 676         int result;
 677
 678         dmabuf = kmalloc(bufsize, GFP_KERNEL);
 679         if (!dmabuf)
 680                 return -ENOMEM;
 681
 682         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 683                                  CP210X_VENDOR_SPECIFIC, type, val,
 684                                  cp210x_interface_num(serial), dmabuf, bufsize,
 685                                  USB_CTRL_GET_TIMEOUT);
 686         if (result == bufsize) {
 687                 memcpy(buf, dmabuf, bufsize);
 688                 result = 0;
 689         } else {
 690                 dev_err(&serial->interface->dev,
 691                         "failed to get vendor val 0x%04x size %d: %d\n", val,
 692                         bufsize, result);
 693                 if (result >= 0)
 694                         result = -EIO;
 695         }
 696
 697         kfree(dmabuf);
 698
 699         return result;
 700 }
 701
 702 /*
 703  * Writes any 16-bit CP210X_ register (req) whose value is passed
 704  * entirely in the wValue field of the USB request.
 705  */
 706 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
 707 {
 708         struct usb_serial *serial = port->serial;
 709         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 710         int result;
 711
 712         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 713                         req, REQTYPE_HOST_TO_INTERFACE, val,
 714                         port_priv->bInterfaceNumber, NULL, 0,
 715                         USB_CTRL_SET_TIMEOUT);
 716         if (result < 0) {
 717                 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
 718                                 req, result);
 719         }
 720
 721         return result;
 722 }
 723
 724 /*
 725  * Writes a variable-sized block of CP210X_ registers, identified by req.
 726  * Data in buf must be in native USB byte order.
 727  */
 728 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
 729                 void *buf, int bufsize)
 730 {
 731         struct usb_serial *serial = port->serial;
 732         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 733         void *dmabuf;
 734         int result;
 735
 736         dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
 737         if (!dmabuf)
 738                 return -ENOMEM;
 739
 740         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 741                         req, REQTYPE_HOST_TO_INTERFACE, 0,
 742                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 743                         USB_CTRL_SET_TIMEOUT);
 744
 745         kfree(dmabuf);
 746
 747         if (result < 0) {
 748                 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
 749                                 req, bufsize, result);
 750                 return result;
 751         }
 752
 753         return 0;
 754 }
 755
 756 /*
 757  * Writes any 32-bit CP210X_ register identified by req.
 758  */
 759 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
 760 {
 761         __le32 le32_val;
 762
 763         le32_val = cpu_to_le32(val);
 764
 765         return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
 766 }
 767
 768 #ifdef CONFIG_GPIOLIB
 769 /*
 770  * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
 771  * Data in buf must be in native USB byte order.
 772  */
 773 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
 774                                      u16 val, void *buf, int bufsize)
 775 {
 776         void *dmabuf;
 777         int result;
 778
 779         dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
 780         if (!dmabuf)
 781                 return -ENOMEM;
 782
 783         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 784                                  CP210X_VENDOR_SPECIFIC, type, val,
 785                                  cp210x_interface_num(serial), dmabuf, bufsize,
 786                                  USB_CTRL_SET_TIMEOUT);
 787
 788         kfree(dmabuf);
 789
 790         if (result < 0) {
 791                 dev_err(&serial->interface->dev,
 792                         "failed to set vendor val 0x%04x size %d: %d\n", val,
 793                         bufsize, result);
 794                 return result;
 795         }
 796
 797         return 0;
 798 }
 799 #endif
 800
 801 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 802 {
 803         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 804         int result;
 805
 806         result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
 807         if (result) {
 808                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
 809                 return result;
 810         }
 811
 812         if (tty)
 813                 cp210x_set_termios(tty, port, NULL);
 814
 815         result = usb_serial_generic_open(tty, port);
 816         if (result)
 817                 goto err_disable;
 818
 819         return 0;
 820
 821 err_disable:
 822         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 823         port_priv->event_mode = false;
 824
 825         return result;
 826 }
 827
 828 static void cp210x_close(struct usb_serial_port *port)
 829 {
 830         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 831
 832         usb_serial_generic_close(port);
 833
 834         /* Clear both queues; cp2108 needs this to avoid an occasional hang */
 835         cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
 836
 837         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 838
 839         /* Disabling the interface disables event-insertion mode. */
 840         port_priv->event_mode = false;
 841 }
 842
 843 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag)
 844 {
 845         if (lsr & CP210X_LSR_BREAK) {
 846                 port->icount.brk++;
 847                 *flag = TTY_BREAK;
 848         } else if (lsr & CP210X_LSR_PARITY) {
 849                 port->icount.parity++;
 850                 *flag = TTY_PARITY;
 851         } else if (lsr & CP210X_LSR_FRAME) {
 852                 port->icount.frame++;
 853                 *flag = TTY_FRAME;
 854         }
 855
 856         if (lsr & CP210X_LSR_OVERRUN) {
 857                 port->icount.overrun++;
 858                 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
 859         }
 860 }
 861
 862 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag)
 863 {
 864         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 865
 866         switch (port_priv->event_state) {
 867         case ES_DATA:
 868                 if (*ch == CP210X_ESCCHAR) {
 869                         port_priv->event_state = ES_ESCAPE;
 870                         break;
 871                 }
 872                 return false;
 873         case ES_ESCAPE:
 874                 switch (*ch) {
 875                 case 0:
 876                         dev_dbg(&port->dev, "%s - escape char\n", __func__);
 877                         *ch = CP210X_ESCCHAR;
 878                         port_priv->event_state = ES_DATA;
 879                         return false;
 880                 case 1:
 881                         port_priv->event_state = ES_LSR_DATA_0;
 882                         break;
 883                 case 2:
 884                         port_priv->event_state = ES_LSR;
 885                         break;
 886                 case 3:
 887                         port_priv->event_state = ES_MSR;
 888                         break;
 889                 default:
 890                         dev_err(&port->dev, "malformed event 0x%02x\n", *ch);
 891                         port_priv->event_state = ES_DATA;
 892                         break;
 893                 }
 894                 break;
 895         case ES_LSR_DATA_0:
 896                 port_priv->lsr = *ch;
 897                 port_priv->event_state = ES_LSR_DATA_1;
 898                 break;
 899         case ES_LSR_DATA_1:
 900                 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n",
 901                                 __func__, port_priv->lsr, *ch);
 902                 cp210x_process_lsr(port, port_priv->lsr, flag);
 903                 port_priv->event_state = ES_DATA;
 904                 return false;
 905         case ES_LSR:
 906                 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch);
 907                 port_priv->lsr = *ch;
 908                 cp210x_process_lsr(port, port_priv->lsr, flag);
 909                 port_priv->event_state = ES_DATA;
 910                 break;
 911         case ES_MSR:
 912                 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch);
 913                 /* unimplemented */
 914                 port_priv->event_state = ES_DATA;
 915                 break;
 916         }
 917
 918         return true;
 919 }
 920
 921 static void cp210x_process_read_urb(struct urb *urb)
 922 {
 923         struct usb_serial_port *port = urb->context;
 924         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 925         unsigned char *ch = urb->transfer_buffer;
 926         char flag;
 927         int i;
 928
 929         if (!urb->actual_length)
 930                 return;
 931
 932         if (port_priv->event_mode) {
 933                 for (i = 0; i < urb->actual_length; i++, ch++) {
 934                         flag = TTY_NORMAL;
 935
 936                         if (cp210x_process_char(port, ch, &flag))
 937                                 continue;
 938
 939                         tty_insert_flip_char(&port->port, *ch, flag);
 940                 }
 941         } else {
 942                 tty_insert_flip_string(&port->port, ch, urb->actual_length);
 943         }
 944         tty_flip_buffer_push(&port->port);
 945 }
 946
 947 /*
 948  * Read how many bytes are waiting in the TX queue.
 949  */
 950 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
 951                 u32 *count)
 952 {
 953         struct usb_serial *serial = port->serial;
 954         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 955         struct cp210x_comm_status *sts;
 956         int result;
 957
 958         sts = kmalloc(sizeof(*sts), GFP_KERNEL);
 959         if (!sts)
 960                 return -ENOMEM;
 961
 962         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 963                         CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
 964                         0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
 965                         USB_CTRL_GET_TIMEOUT);
 966         if (result == sizeof(*sts)) {
 967                 *count = le32_to_cpu(sts->ulAmountInOutQueue);
 968                 result = 0;
 969         } else {
 970                 dev_err(&port->dev, "failed to get comm status: %d\n", result);
 971                 if (result >= 0)
 972                         result = -EIO;
 973         }
 974
 975         kfree(sts);
 976
 977         return result;
 978 }
 979
 980 static bool cp210x_tx_empty(struct usb_serial_port *port)
 981 {
 982         int err;
 983         u32 count;
 984
 985         err = cp210x_get_tx_queue_byte_count(port, &count);
 986         if (err)
 987                 return true;
 988
 989         return !count;
 990 }
 991
 992 struct cp210x_rate {
 993         speed_t rate;
 994         speed_t high;
 995 };
 996
 997 static const struct cp210x_rate cp210x_an205_table1[] = {
 998         { 300, 300 },
 999         { 600, 600 },
1000         { 1200, 1200 },
1001         { 1800, 1800 },
1002         { 2400, 2400 },
1003         { 4000, 4000 },
1004         { 4800, 4803 },
1005         { 7200, 7207 },
1006         { 9600, 9612 },
1007         { 14400, 14428 },
1008         { 16000, 16062 },
1009         { 19200, 19250 },
1010         { 28800, 28912 },
1011         { 38400, 38601 },
1012         { 51200, 51558 },
1013         { 56000, 56280 },
1014         { 57600, 58053 },
1015         { 64000, 64111 },
1016         { 76800, 77608 },
1017         { 115200, 117028 },
1018         { 128000, 129347 },
1019         { 153600, 156868 },
1020         { 230400, 237832 },
1021         { 250000, 254234 },
1022         { 256000, 273066 },
1023         { 460800, 491520 },
1024         { 500000, 567138 },
1025         { 576000, 670254 },
1026         { 921600, UINT_MAX }
1027 };
1028
1029 /*
1030  * Quantises the baud rate as per AN205 Table 1
1031  */
1032 static speed_t cp210x_get_an205_rate(speed_t baud)
1033 {
1034         int i;
1035
1036         for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) {
1037                 if (baud <= cp210x_an205_table1[i].high)
1038                         break;
1039         }
1040
1041         return cp210x_an205_table1[i].rate;
1042 }
1043
1044 static speed_t cp210x_get_actual_rate(speed_t baud)
1045 {
1046         unsigned int prescale = 1;
1047         unsigned int div;
1048
1049         if (baud <= 365)
1050                 prescale = 4;
1051
1052         div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud);
1053         baud = 48000000 / (2 * prescale * div);
1054
1055         return baud;
1056 }
1057
1058 /*
1059  * CP2101 supports the following baud rates:
1060  *
1061  *      300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1062  *      38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1063  *
1064  * CP2102 and CP2103 support the following additional rates:
1065  *
1066  *      4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1067  *      576000
1068  *
1069  * The device will map a requested rate to a supported one, but the result
1070  * of requests for rates greater than 1053257 is undefined (see AN205).
1071  *
1072  * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1073  * respectively, with an error less than 1%. The actual rates are determined
1074  * by
1075  *
1076  *      div = round(freq / (2 x prescale x request))
1077  *      actual = freq / (2 x prescale x div)
1078  *
1079  * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1080  * or 1 otherwise.
1081  * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1082  * otherwise.
1083  */
1084 static void cp210x_change_speed(struct tty_struct *tty,
1085                 struct usb_serial_port *port, struct ktermios *old_termios)
1086 {
1087         struct usb_serial *serial = port->serial;
1088         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1089         u32 baud;
1090
1091         /*
1092          * This maps the requested rate to the actual rate, a valid rate on
1093          * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed].
1094          *
1095          * NOTE: B0 is not implemented.
1096          */
1097         baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed);
1098
1099         if (priv->use_actual_rate)
1100                 baud = cp210x_get_actual_rate(baud);
1101         else if (baud < 1000000)
1102                 baud = cp210x_get_an205_rate(baud);
1103
1104         dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1105         if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1106                 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1107                 if (old_termios)
1108                         baud = old_termios->c_ospeed;
1109                 else
1110                         baud = 9600;
1111         }
1112
1113         tty_encode_baud_rate(tty, baud, baud);
1114 }
1115
1116 static void cp210x_enable_event_mode(struct usb_serial_port *port)
1117 {
1118         struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1119         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1120         int ret;
1121
1122         if (port_priv->event_mode)
1123                 return;
1124
1125         if (priv->no_event_mode)
1126                 return;
1127
1128         port_priv->event_state = ES_DATA;
1129         port_priv->event_mode = true;
1130
1131         ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR);
1132         if (ret) {
1133                 dev_err(&port->dev, "failed to enable events: %d\n", ret);
1134                 port_priv->event_mode = false;
1135         }
1136 }
1137
1138 static void cp210x_disable_event_mode(struct usb_serial_port *port)
1139 {
1140         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1141         int ret;
1142
1143         if (!port_priv->event_mode)
1144                 return;
1145
1146         ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0);
1147         if (ret) {
1148                 dev_err(&port->dev, "failed to disable events: %d\n", ret);
1149                 return;
1150         }
1151
1152         port_priv->event_mode = false;
1153 }
1154
1155 static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b)
1156 {
1157         bool iflag_change, cc_change;
1158
1159         iflag_change = ((a->c_iflag ^ b->c_iflag) & (INPCK | IXON | IXOFF));
1160         cc_change = a->c_cc[VSTART] != b->c_cc[VSTART] ||
1161                         a->c_cc[VSTOP] != b->c_cc[VSTOP];
1162
1163         return tty_termios_hw_change(a, b) || iflag_change || cc_change;
1164 }
1165
1166 static void cp210x_set_flow_control(struct tty_struct *tty,
1167                 struct usb_serial_port *port, struct ktermios *old_termios)
1168 {
1169         struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1170         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1171         struct cp210x_special_chars chars;
1172         struct cp210x_flow_ctl flow_ctl;
1173         u32 flow_repl;
1174         u32 ctl_hs;
1175         bool crtscts;
1176         int ret;
1177
1178         /*
1179          * Some CP2102N interpret ulXonLimit as ulFlowReplace (erratum
1180          * CP2102N_E104). Report back that flow control is not supported.
1181          */
1182         if (priv->no_flow_control) {
1183                 tty->termios.c_cflag &= ~CRTSCTS;
1184                 tty->termios.c_iflag &= ~(IXON | IXOFF);
1185         }
1186
1187         if (old_termios &&
1188                         C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) &&
1189                         I_IXON(tty) == (old_termios->c_iflag & IXON) &&
1190                         I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) &&
1191                         START_CHAR(tty) == old_termios->c_cc[VSTART] &&
1192                         STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) {
1193                 return;
1194         }
1195
1196         if (I_IXON(tty) || I_IXOFF(tty)) {
1197                 memset(&chars, 0, sizeof(chars));
1198
1199                 chars.bXonChar = START_CHAR(tty);
1200                 chars.bXoffChar = STOP_CHAR(tty);
1201
1202                 ret = cp210x_write_reg_block(port, CP210X_SET_CHARS, &chars,
1203                                 sizeof(chars));
1204                 if (ret) {
1205                         dev_err(&port->dev, "failed to set special chars: %d\n",
1206                                         ret);
1207                 }
1208         }
1209
1210         mutex_lock(&port_priv->mutex);
1211
1212         ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1213                         sizeof(flow_ctl));
1214         if (ret)
1215                 goto out_unlock;
1216
1217         ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1218         flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1219
1220         ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1221         ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1222         ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1223         ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1224         if (port_priv->dtr)
1225                 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
1226         else
1227                 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
1228
1229         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1230         if (C_CRTSCTS(tty)) {
1231                 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1232                 if (port_priv->rts)
1233                         flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
1234                 else
1235                         flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1236                 crtscts = true;
1237         } else {
1238                 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1239                 if (port_priv->rts)
1240                         flow_repl |= CP210X_SERIAL_RTS_ACTIVE;
1241                 else
1242                         flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1243                 crtscts = false;
1244         }
1245
1246         if (I_IXOFF(tty)) {
1247                 flow_repl |= CP210X_SERIAL_AUTO_RECEIVE;
1248
1249                 flow_ctl.ulXonLimit = cpu_to_le32(128);
1250                 flow_ctl.ulXoffLimit = cpu_to_le32(128);
1251         } else {
1252                 flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE;
1253         }
1254
1255         if (I_IXON(tty))
1256                 flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT;
1257         else
1258                 flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT;
1259
1260         dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__,
1261                         ctl_hs, flow_repl);
1262
1263         flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1264         flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1265
1266         ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1267                         sizeof(flow_ctl));
1268         if (ret)
1269                 goto out_unlock;
1270
1271         port_priv->crtscts = crtscts;
1272 out_unlock:
1273         mutex_unlock(&port_priv->mutex);
1274 }
1275
1276 static void cp210x_set_termios(struct tty_struct *tty,
1277                 struct usb_serial_port *port, struct ktermios *old_termios)
1278 {
1279         struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1280         u16 bits;
1281         int ret;
1282
1283         if (old_termios && !cp210x_termios_change(&tty->termios, old_termios))
1284                 return;
1285
1286         if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed)
1287                 cp210x_change_speed(tty, port, old_termios);
1288
1289         /* CP2101 only supports CS8, 1 stop bit and non-stick parity. */
1290         if (priv->partnum == CP210X_PARTNUM_CP2101) {
1291                 tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR);
1292                 tty->termios.c_cflag |= CS8;
1293         }
1294
1295         bits = 0;
1296
1297         switch (C_CSIZE(tty)) {
1298         case CS5:
1299                 bits |= BITS_DATA_5;
1300                 break;
1301         case CS6:
1302                 bits |= BITS_DATA_6;
1303                 break;
1304         case CS7:
1305                 bits |= BITS_DATA_7;
1306                 break;
1307         case CS8:
1308         default:
1309                 bits |= BITS_DATA_8;
1310                 break;
1311         }
1312
1313         if (C_PARENB(tty)) {
1314                 if (C_CMSPAR(tty)) {
1315                         if (C_PARODD(tty))
1316                                 bits |= BITS_PARITY_MARK;
1317                         else
1318                                 bits |= BITS_PARITY_SPACE;
1319                 } else {
1320                         if (C_PARODD(tty))
1321                                 bits |= BITS_PARITY_ODD;
1322                         else
1323                                 bits |= BITS_PARITY_EVEN;
1324                 }
1325         }
1326
1327         if (C_CSTOPB(tty))
1328                 bits |= BITS_STOP_2;
1329         else
1330                 bits |= BITS_STOP_1;
1331
1332         ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1333         if (ret)
1334                 dev_err(&port->dev, "failed to set line control: %d\n", ret);
1335
1336         cp210x_set_flow_control(tty, port, old_termios);
1337
1338         /*
1339          * Enable event-insertion mode only if input parity checking is
1340          * enabled for now.
1341          */
1342         if (I_INPCK(tty))
1343                 cp210x_enable_event_mode(port);
1344         else
1345                 cp210x_disable_event_mode(port);
1346 }
1347
1348 static int cp210x_tiocmset(struct tty_struct *tty,
1349                 unsigned int set, unsigned int clear)
1350 {
1351         struct usb_serial_port *port = tty->driver_data;
1352         return cp210x_tiocmset_port(port, set, clear);
1353 }
1354
1355 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1356                 unsigned int set, unsigned int clear)
1357 {
1358         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1359         struct cp210x_flow_ctl flow_ctl;
1360         u32 ctl_hs, flow_repl;
1361         u16 control = 0;
1362         int ret;
1363
1364         mutex_lock(&port_priv->mutex);
1365
1366         if (set & TIOCM_RTS) {
1367                 port_priv->rts = true;
1368                 control |= CONTROL_RTS;
1369                 control |= CONTROL_WRITE_RTS;
1370         }
1371         if (set & TIOCM_DTR) {
1372                 port_priv->dtr = true;
1373                 control |= CONTROL_DTR;
1374                 control |= CONTROL_WRITE_DTR;
1375         }
1376         if (clear & TIOCM_RTS) {
1377                 port_priv->rts = false;
1378                 control &= ~CONTROL_RTS;
1379                 control |= CONTROL_WRITE_RTS;
1380         }
1381         if (clear & TIOCM_DTR) {
1382                 port_priv->dtr = false;
1383                 control &= ~CONTROL_DTR;
1384                 control |= CONTROL_WRITE_DTR;
1385         }
1386
1387         /*
1388          * Use SET_FLOW to set DTR and enable/disable auto-RTS when hardware
1389          * flow control is enabled.
1390          */
1391         if (port_priv->crtscts && control & CONTROL_WRITE_RTS) {
1392                 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1393                                 sizeof(flow_ctl));
1394                 if (ret)
1395                         goto out_unlock;
1396
1397                 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1398                 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1399
1400                 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1401                 if (port_priv->dtr)
1402                         ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
1403                 else
1404                         ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
1405
1406                 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1407                 if (port_priv->rts)
1408                         flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
1409                 else
1410                         flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1411
1412                 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1413                 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1414
1415                 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n",
1416                                 __func__, ctl_hs, flow_repl);
1417
1418                 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1419                                 sizeof(flow_ctl));
1420         } else {
1421                 dev_dbg(&port->dev, "%s - control = 0x%04x\n", __func__, control);
1422
1423                 ret = cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1424         }
1425 out_unlock:
1426         mutex_unlock(&port_priv->mutex);
1427
1428         return ret;
1429 }
1430
1431 static void cp210x_dtr_rts(struct usb_serial_port *port, int on)
1432 {
1433         if (on)
1434                 cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0);
1435         else
1436                 cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS);
1437 }
1438
1439 static int cp210x_tiocmget(struct tty_struct *tty)
1440 {
1441         struct usb_serial_port *port = tty->driver_data;
1442         u8 control;
1443         int result;
1444
1445         result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1446         if (result)
1447                 return result;
1448
1449         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1450                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1451                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1452                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1453                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
1454                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
1455
1456         dev_dbg(&port->dev, "%s - control = 0x%02x\n", __func__, control);
1457
1458         return result;
1459 }
1460
1461 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1462 {
1463         struct usb_serial_port *port = tty->driver_data;
1464         u16 state;
1465
1466         if (break_state == 0)
1467                 state = BREAK_OFF;
1468         else
1469                 state = BREAK_ON;
1470         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1471                 state == BREAK_OFF ? "off" : "on");
1472         cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1473 }
1474
1475 #ifdef CONFIG_GPIOLIB
1476 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1477 {
1478         struct usb_serial *serial = gpiochip_get_data(gc);
1479         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1480         u8 req_type;
1481         u16 mask;
1482         int result;
1483         int len;
1484
1485         result = usb_autopm_get_interface(serial->interface);
1486         if (result)
1487                 return result;
1488
1489         switch (priv->partnum) {
1490         case CP210X_PARTNUM_CP2105:
1491                 req_type = REQTYPE_INTERFACE_TO_HOST;
1492                 len = 1;
1493                 break;
1494         case CP210X_PARTNUM_CP2108:
1495                 req_type = REQTYPE_INTERFACE_TO_HOST;
1496                 len = 2;
1497                 break;
1498         default:
1499                 req_type = REQTYPE_DEVICE_TO_HOST;
1500                 len = 1;
1501                 break;
1502         }
1503
1504         mask = 0;
1505         result = cp210x_read_vendor_block(serial, req_type, CP210X_READ_LATCH,
1506                                           &mask, len);
1507
1508         usb_autopm_put_interface(serial->interface);
1509
1510         if (result < 0)
1511                 return result;
1512
1513         le16_to_cpus(&mask);
1514
1515         return !!(mask & BIT(gpio));
1516 }
1517
1518 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1519 {
1520         struct usb_serial *serial = gpiochip_get_data(gc);
1521         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1522         struct cp210x_gpio_write16 buf16;
1523         struct cp210x_gpio_write buf;
1524         u16 mask, state;
1525         u16 wIndex;
1526         int result;
1527
1528         if (value == 1)
1529                 state = BIT(gpio);
1530         else
1531                 state = 0;
1532
1533         mask = BIT(gpio);
1534
1535         result = usb_autopm_get_interface(serial->interface);
1536         if (result)
1537                 goto out;
1538
1539         switch (priv->partnum) {
1540         case CP210X_PARTNUM_CP2105:
1541                 buf.mask = (u8)mask;
1542                 buf.state = (u8)state;
1543                 result = cp210x_write_vendor_block(serial,
1544                                                    REQTYPE_HOST_TO_INTERFACE,
1545                                                    CP210X_WRITE_LATCH, &buf,
1546                                                    sizeof(buf));
1547                 break;
1548         case CP210X_PARTNUM_CP2108:
1549                 buf16.mask = cpu_to_le16(mask);
1550                 buf16.state = cpu_to_le16(state);
1551                 result = cp210x_write_vendor_block(serial,
1552                                                    REQTYPE_HOST_TO_INTERFACE,
1553                                                    CP210X_WRITE_LATCH, &buf16,
1554                                                    sizeof(buf16));
1555                 break;
1556         default:
1557                 wIndex = state << 8 | mask;
1558                 result = usb_control_msg(serial->dev,
1559                                          usb_sndctrlpipe(serial->dev, 0),
1560                                          CP210X_VENDOR_SPECIFIC,
1561                                          REQTYPE_HOST_TO_DEVICE,
1562                                          CP210X_WRITE_LATCH,
1563                                          wIndex,
1564                                          NULL, 0, USB_CTRL_SET_TIMEOUT);
1565                 break;
1566         }
1567
1568         usb_autopm_put_interface(serial->interface);
1569 out:
1570         if (result < 0) {
1571                 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n",
1572                                 result);
1573         }
1574 }
1575
1576 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1577 {
1578         struct usb_serial *serial = gpiochip_get_data(gc);
1579         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1580
1581         return priv->gpio_input & BIT(gpio);
1582 }
1583
1584 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1585 {
1586         struct usb_serial *serial = gpiochip_get_data(gc);
1587         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1588
1589         if (priv->partnum == CP210X_PARTNUM_CP2105) {
1590                 /* hardware does not support an input mode */
1591                 return -ENOTSUPP;
1592         }
1593
1594         /* push-pull pins cannot be changed to be inputs */
1595         if (priv->gpio_pushpull & BIT(gpio))
1596                 return -EINVAL;
1597
1598         /* make sure to release pin if it is being driven low */
1599         cp210x_gpio_set(gc, gpio, 1);
1600
1601         priv->gpio_input |= BIT(gpio);
1602
1603         return 0;
1604 }
1605
1606 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1607                                         int value)
1608 {
1609         struct usb_serial *serial = gpiochip_get_data(gc);
1610         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1611
1612         priv->gpio_input &= ~BIT(gpio);
1613         cp210x_gpio_set(gc, gpio, value);
1614
1615         return 0;
1616 }
1617
1618 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1619                                   unsigned long config)
1620 {
1621         struct usb_serial *serial = gpiochip_get_data(gc);
1622         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1623         enum pin_config_param param = pinconf_to_config_param(config);
1624
1625         /* Succeed only if in correct mode (this can't be set at runtime) */
1626         if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1627             (priv->gpio_pushpull & BIT(gpio)))
1628                 return 0;
1629
1630         if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1631             !(priv->gpio_pushpull & BIT(gpio)))
1632                 return 0;
1633
1634         return -ENOTSUPP;
1635 }
1636
1637 static int cp210x_gpio_init_valid_mask(struct gpio_chip *gc,
1638                 unsigned long *valid_mask, unsigned int ngpios)
1639 {
1640         struct usb_serial *serial = gpiochip_get_data(gc);
1641         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1642         struct device *dev = &serial->interface->dev;
1643         unsigned long altfunc_mask = priv->gpio_altfunc;
1644
1645         bitmap_complement(valid_mask, &altfunc_mask, ngpios);
1646
1647         if (bitmap_empty(valid_mask, ngpios))
1648                 dev_dbg(dev, "no pin configured for GPIO\n");
1649         else
1650                 dev_dbg(dev, "GPIO.%*pbl configured for GPIO\n", ngpios,
1651                                 valid_mask);
1652         return 0;
1653 }
1654
1655 /*
1656  * This function is for configuring GPIO using shared pins, where other signals
1657  * are made unavailable by configuring the use of GPIO. This is believed to be
1658  * only applicable to the cp2105 at this point, the other devices supported by
1659  * this driver that provide GPIO do so in a way that does not impact other
1660  * signals and are thus expected to have very different initialisation.
1661  */
1662 static int cp2105_gpioconf_init(struct usb_serial *serial)
1663 {
1664         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1665         struct cp210x_pin_mode mode;
1666         struct cp210x_dual_port_config config;
1667         u8 intf_num = cp210x_interface_num(serial);
1668         u8 iface_config;
1669         int result;
1670
1671         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1672                                           CP210X_GET_DEVICEMODE, &mode,
1673                                           sizeof(mode));
1674         if (result < 0)
1675                 return result;
1676
1677         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1678                                           CP210X_GET_PORTCONFIG, &config,
1679                                           sizeof(config));
1680         if (result < 0)
1681                 return result;
1682
1683         /*  2 banks of GPIO - One for the pins taken from each serial port */
1684         if (intf_num == 0) {
1685                 if (mode.eci == CP210X_PIN_MODE_MODEM) {
1686                         /* mark all GPIOs of this interface as reserved */
1687                         priv->gpio_altfunc = 0xff;
1688                         return 0;
1689                 }
1690
1691                 iface_config = config.eci_cfg;
1692                 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1693                                                 CP210X_ECI_GPIO_MODE_MASK) >>
1694                                                 CP210X_ECI_GPIO_MODE_OFFSET);
1695                 priv->gc.ngpio = 2;
1696         } else if (intf_num == 1) {
1697                 if (mode.sci == 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.sci_cfg;
1704                 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1705                                                 CP210X_SCI_GPIO_MODE_MASK) >>
1706                                                 CP210X_SCI_GPIO_MODE_OFFSET);
1707                 priv->gc.ngpio = 3;
1708         } else {
1709                 return -ENODEV;
1710         }
1711
1712         /* mark all pins which are not in GPIO mode */
1713         if (iface_config & CP2105_GPIO0_TXLED_MODE)     /* GPIO 0 */
1714                 priv->gpio_altfunc |= BIT(0);
1715         if (iface_config & (CP2105_GPIO1_RXLED_MODE |   /* GPIO 1 */
1716                         CP2105_GPIO1_RS485_MODE))
1717                 priv->gpio_altfunc |= BIT(1);
1718
1719         /* driver implementation for CP2105 only supports outputs */
1720         priv->gpio_input = 0;
1721
1722         return 0;
1723 }
1724
1725 static int cp2104_gpioconf_init(struct usb_serial *serial)
1726 {
1727         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1728         struct cp210x_single_port_config config;
1729         u8 iface_config;
1730         u8 gpio_latch;
1731         int result;
1732         u8 i;
1733
1734         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1735                                           CP210X_GET_PORTCONFIG, &config,
1736                                           sizeof(config));
1737         if (result < 0)
1738                 return result;
1739
1740         priv->gc.ngpio = 4;
1741
1742         iface_config = config.device_cfg;
1743         priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1744                                         CP210X_GPIO_MODE_MASK) >>
1745                                         CP210X_GPIO_MODE_OFFSET);
1746         gpio_latch = (u8)((le16_to_cpu(config.reset_state) &
1747                                         CP210X_GPIO_MODE_MASK) >>
1748                                         CP210X_GPIO_MODE_OFFSET);
1749
1750         /* mark all pins which are not in GPIO mode */
1751         if (iface_config & CP2104_GPIO0_TXLED_MODE)     /* GPIO 0 */
1752                 priv->gpio_altfunc |= BIT(0);
1753         if (iface_config & CP2104_GPIO1_RXLED_MODE)     /* GPIO 1 */
1754                 priv->gpio_altfunc |= BIT(1);
1755         if (iface_config & CP2104_GPIO2_RS485_MODE)     /* GPIO 2 */
1756                 priv->gpio_altfunc |= BIT(2);
1757
1758         /*
1759          * Like CP2102N, CP2104 has also no strict input and output pin
1760          * modes.
1761          * Do the same input mode emulation as CP2102N.
1762          */
1763         for (i = 0; i < priv->gc.ngpio; ++i) {
1764                 /*
1765                  * Set direction to "input" iff pin is open-drain and reset
1766                  * value is 1.
1767                  */
1768                 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1769                         priv->gpio_input |= BIT(i);
1770         }
1771
1772         return 0;
1773 }
1774
1775 static int cp2108_gpio_init(struct usb_serial *serial)
1776 {
1777         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1778         struct cp210x_quad_port_config config;
1779         u16 gpio_latch;
1780         int result;
1781         u8 i;
1782
1783         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1784                                           CP210X_GET_PORTCONFIG, &config,
1785                                           sizeof(config));
1786         if (result < 0)
1787                 return result;
1788
1789         priv->gc.ngpio = 16;
1790         priv->gpio_pushpull = le16_to_cpu(config.reset_state.gpio_mode_pb1);
1791         gpio_latch = le16_to_cpu(config.reset_state.gpio_latch_pb1);
1792
1793         /*
1794          * Mark all pins which are not in GPIO mode.
1795          *
1796          * Refer to table 9.1 "GPIO Mode alternate Functions" in the datasheet:
1797          * https://www.silabs.com/documents/public/data-sheets/cp2108-datasheet.pdf
1798          *
1799          * Alternate functions of GPIO0 to GPIO3 are determine by enhancedfxn_ifc[0]
1800          * and the similarly for the other pins; enhancedfxn_ifc[1]: GPIO4 to GPIO7,
1801          * enhancedfxn_ifc[2]: GPIO8 to GPIO11, enhancedfxn_ifc[3]: GPIO12 to GPIO15.
1802          */
1803         for (i = 0; i < 4; i++) {
1804                 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_TXLED)
1805                         priv->gpio_altfunc |= BIT(i * 4);
1806                 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RXLED)
1807                         priv->gpio_altfunc |= BIT((i * 4) + 1);
1808                 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RS485)
1809                         priv->gpio_altfunc |= BIT((i * 4) + 2);
1810                 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_CLOCK)
1811                         priv->gpio_altfunc |= BIT((i * 4) + 3);
1812         }
1813
1814         /*
1815          * Like CP2102N, CP2108 has also no strict input and output pin
1816          * modes. Do the same input mode emulation as CP2102N.
1817          */
1818         for (i = 0; i < priv->gc.ngpio; ++i) {
1819                 /*
1820                  * Set direction to "input" iff pin is open-drain and reset
1821                  * value is 1.
1822                  */
1823                 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1824                         priv->gpio_input |= BIT(i);
1825         }
1826
1827         return 0;
1828 }
1829
1830 static int cp2102n_gpioconf_init(struct usb_serial *serial)
1831 {
1832         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1833         const u16 config_size = 0x02a6;
1834         u8 gpio_rst_latch;
1835         u8 config_version;
1836         u8 gpio_pushpull;
1837         u8 *config_buf;
1838         u8 gpio_latch;
1839         u8 gpio_ctrl;
1840         int result;
1841         u8 i;
1842
1843         /*
1844          * Retrieve device configuration from the device.
1845          * The array received contains all customization settings done at the
1846          * factory/manufacturer. Format of the array is documented at the
1847          * time of writing at:
1848          * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa
1849          */
1850         config_buf = kmalloc(config_size, GFP_KERNEL);
1851         if (!config_buf)
1852                 return -ENOMEM;
1853
1854         result = cp210x_read_vendor_block(serial,
1855                                           REQTYPE_DEVICE_TO_HOST,
1856                                           CP210X_READ_2NCONFIG,
1857                                           config_buf,
1858                                           config_size);
1859         if (result < 0) {
1860                 kfree(config_buf);
1861                 return result;
1862         }
1863
1864         config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX];
1865         gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX];
1866         gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX];
1867         gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX];
1868
1869         kfree(config_buf);
1870
1871         /* Make sure this is a config format we understand. */
1872         if (config_version != 0x01)
1873                 return -ENOTSUPP;
1874
1875         priv->gc.ngpio = 4;
1876
1877         /*
1878          * Get default pin states after reset. Needed so we can determine
1879          * the direction of an open-drain pin.
1880          */
1881         gpio_latch = (gpio_rst_latch >> 3) & 0x0f;
1882
1883         /* 0 indicates open-drain mode, 1 is push-pull */
1884         priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f;
1885
1886         /* 0 indicates GPIO mode, 1 is alternate function */
1887         if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) {
1888                 /* QFN20 is special... */
1889                 if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE)   /* GPIO 0 */
1890                         priv->gpio_altfunc |= BIT(0);
1891                 if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */
1892                         priv->gpio_altfunc |= BIT(1);
1893                 if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */
1894                         priv->gpio_altfunc |= BIT(2);
1895                 if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */
1896                         priv->gpio_altfunc |= BIT(3);
1897         } else {
1898                 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f;
1899         }
1900
1901         if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) {
1902                 /*
1903                  * For the QFN28 package, GPIO4-6 are controlled by
1904                  * the low three bits of the mode/latch fields.
1905                  * Contrary to the document linked above, the bits for
1906                  * the SUSPEND pins are elsewhere.  No alternate
1907                  * function is available for these pins.
1908                  */
1909                 priv->gc.ngpio = 7;
1910                 gpio_latch |= (gpio_rst_latch & 7) << 4;
1911                 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4;
1912         }
1913
1914         /*
1915          * The CP2102N does not strictly has input and output pin modes,
1916          * it only knows open-drain and push-pull modes which is set at
1917          * factory. An open-drain pin can function both as an
1918          * input or an output. We emulate input mode for open-drain pins
1919          * by making sure they are not driven low, and we do not allow
1920          * push-pull pins to be set as an input.
1921          */
1922         for (i = 0; i < priv->gc.ngpio; ++i) {
1923                 /*
1924                  * Set direction to "input" iff pin is open-drain and reset
1925                  * value is 1.
1926                  */
1927                 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1928                         priv->gpio_input |= BIT(i);
1929         }
1930
1931         return 0;
1932 }
1933
1934 static int cp210x_gpio_init(struct usb_serial *serial)
1935 {
1936         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1937         int result;
1938
1939         switch (priv->partnum) {
1940         case CP210X_PARTNUM_CP2104:
1941                 result = cp2104_gpioconf_init(serial);
1942                 break;
1943         case CP210X_PARTNUM_CP2105:
1944                 result = cp2105_gpioconf_init(serial);
1945                 break;
1946         case CP210X_PARTNUM_CP2108:
1947                 /*
1948                  * The GPIOs are not tied to any specific port so only register
1949                  * once for interface 0.
1950                  */
1951                 if (cp210x_interface_num(serial) != 0)
1952                         return 0;
1953                 result = cp2108_gpio_init(serial);
1954                 break;
1955         case CP210X_PARTNUM_CP2102N_QFN28:
1956         case CP210X_PARTNUM_CP2102N_QFN24:
1957         case CP210X_PARTNUM_CP2102N_QFN20:
1958                 result = cp2102n_gpioconf_init(serial);
1959                 break;
1960         default:
1961                 return 0;
1962         }
1963
1964         if (result < 0)
1965                 return result;
1966
1967         priv->gc.label = "cp210x";
1968         priv->gc.get_direction = cp210x_gpio_direction_get;
1969         priv->gc.direction_input = cp210x_gpio_direction_input;
1970         priv->gc.direction_output = cp210x_gpio_direction_output;
1971         priv->gc.get = cp210x_gpio_get;
1972         priv->gc.set = cp210x_gpio_set;
1973         priv->gc.set_config = cp210x_gpio_set_config;
1974         priv->gc.init_valid_mask = cp210x_gpio_init_valid_mask;
1975         priv->gc.owner = THIS_MODULE;
1976         priv->gc.parent = &serial->interface->dev;
1977         priv->gc.base = -1;
1978         priv->gc.can_sleep = true;
1979
1980         result = gpiochip_add_data(&priv->gc, serial);
1981         if (!result)
1982                 priv->gpio_registered = true;
1983
1984         return result;
1985 }
1986
1987 static void cp210x_gpio_remove(struct usb_serial *serial)
1988 {
1989         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1990
1991         if (priv->gpio_registered) {
1992                 gpiochip_remove(&priv->gc);
1993                 priv->gpio_registered = false;
1994         }
1995 }
1996
1997 #else
1998
1999 static int cp210x_gpio_init(struct usb_serial *serial)
2000 {
2001         return 0;
2002 }
2003
2004 static void cp210x_gpio_remove(struct usb_serial *serial)
2005 {
2006         /* Nothing to do */
2007 }
2008
2009 #endif
2010
2011 static int cp210x_port_probe(struct usb_serial_port *port)
2012 {
2013         struct usb_serial *serial = port->serial;
2014         struct cp210x_port_private *port_priv;
2015
2016         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
2017         if (!port_priv)
2018                 return -ENOMEM;
2019
2020         port_priv->bInterfaceNumber = cp210x_interface_num(serial);
2021         mutex_init(&port_priv->mutex);
2022
2023         usb_set_serial_port_data(port, port_priv);
2024
2025         return 0;
2026 }
2027
2028 static void cp210x_port_remove(struct usb_serial_port *port)
2029 {
2030         struct cp210x_port_private *port_priv;
2031
2032         port_priv = usb_get_serial_port_data(port);
2033         kfree(port_priv);
2034 }
2035
2036 static void cp210x_init_max_speed(struct usb_serial *serial)
2037 {
2038         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2039         bool use_actual_rate = false;
2040         speed_t min = 300;
2041         speed_t max;
2042
2043         switch (priv->partnum) {
2044         case CP210X_PARTNUM_CP2101:
2045                 max = 921600;
2046                 break;
2047         case CP210X_PARTNUM_CP2102:
2048         case CP210X_PARTNUM_CP2103:
2049                 max = 1000000;
2050                 break;
2051         case CP210X_PARTNUM_CP2104:
2052                 use_actual_rate = true;
2053                 max = 2000000;
2054                 break;
2055         case CP210X_PARTNUM_CP2108:
2056                 max = 2000000;
2057                 break;
2058         case CP210X_PARTNUM_CP2105:
2059                 if (cp210x_interface_num(serial) == 0) {
2060                         use_actual_rate = true;
2061                         max = 2000000;  /* ECI */
2062                 } else {
2063                         min = 2400;
2064                         max = 921600;   /* SCI */
2065                 }
2066                 break;
2067         case CP210X_PARTNUM_CP2102N_QFN28:
2068         case CP210X_PARTNUM_CP2102N_QFN24:
2069         case CP210X_PARTNUM_CP2102N_QFN20:
2070                 use_actual_rate = true;
2071                 max = 3000000;
2072                 break;
2073         default:
2074                 max = 2000000;
2075                 break;
2076         }
2077
2078         priv->min_speed = min;
2079         priv->max_speed = max;
2080         priv->use_actual_rate = use_actual_rate;
2081 }
2082
2083 static void cp2102_determine_quirks(struct usb_serial *serial)
2084 {
2085         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2086         u8 *buf;
2087         int ret;
2088
2089         buf = kmalloc(2, GFP_KERNEL);
2090         if (!buf)
2091                 return;
2092         /*
2093          * Some (possibly counterfeit) CP2102 do not support event-insertion
2094          * mode and respond differently to malformed vendor requests.
2095          * Specifically, they return one instead of two bytes when sent a
2096          * two-byte part-number request.
2097          */
2098         ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2099                         CP210X_VENDOR_SPECIFIC, REQTYPE_DEVICE_TO_HOST,
2100                         CP210X_GET_PARTNUM, 0, buf, 2, USB_CTRL_GET_TIMEOUT);
2101         if (ret == 1) {
2102                 dev_dbg(&serial->interface->dev,
2103                                 "device does not support event-insertion mode\n");
2104                 priv->no_event_mode = true;
2105         }
2106
2107         kfree(buf);
2108 }
2109
2110 static int cp210x_get_fw_version(struct usb_serial *serial, u16 value)
2111 {
2112         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2113         u8 ver[3];
2114         int ret;
2115
2116         ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, value,
2117                         ver, sizeof(ver));
2118         if (ret)
2119                 return ret;
2120
2121         dev_dbg(&serial->interface->dev, "%s - %d.%d.%d\n", __func__,
2122                         ver[0], ver[1], ver[2]);
2123
2124         priv->fw_version = ver[0] << 16 | ver[1] << 8 | ver[2];
2125
2126         return 0;
2127 }
2128
2129 static void cp210x_determine_type(struct usb_serial *serial)
2130 {
2131         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2132         int ret;
2133
2134         ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
2135                         CP210X_GET_PARTNUM, &priv->partnum,
2136                         sizeof(priv->partnum));
2137         if (ret < 0) {
2138                 dev_warn(&serial->interface->dev,
2139                                 "querying part number failed\n");
2140                 priv->partnum = CP210X_PARTNUM_UNKNOWN;
2141                 return;
2142         }
2143
2144         dev_dbg(&serial->interface->dev, "partnum = 0x%02x\n", priv->partnum);
2145
2146         switch (priv->partnum) {
2147         case CP210X_PARTNUM_CP2102:
2148                 cp2102_determine_quirks(serial);
2149                 break;
2150         case CP210X_PARTNUM_CP2105:
2151         case CP210X_PARTNUM_CP2108:
2152                 cp210x_get_fw_version(serial, CP210X_GET_FW_VER);
2153                 break;
2154         case CP210X_PARTNUM_CP2102N_QFN28:
2155         case CP210X_PARTNUM_CP2102N_QFN24:
2156         case CP210X_PARTNUM_CP2102N_QFN20:
2157                 ret = cp210x_get_fw_version(serial, CP210X_GET_FW_VER_2N);
2158                 if (ret)
2159                         break;
2160                 if (priv->fw_version <= 0x10004)
2161                         priv->no_flow_control = true;
2162                 break;
2163         default:
2164                 break;
2165         }
2166 }
2167
2168 static int cp210x_attach(struct usb_serial *serial)
2169 {
2170         int result;
2171         struct cp210x_serial_private *priv;
2172
2173         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2174         if (!priv)
2175                 return -ENOMEM;
2176
2177         usb_set_serial_data(serial, priv);
2178
2179         cp210x_determine_type(serial);
2180         cp210x_init_max_speed(serial);
2181
2182         result = cp210x_gpio_init(serial);
2183         if (result < 0) {
2184                 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n",
2185                                 result);
2186         }
2187
2188         return 0;
2189 }
2190
2191 static void cp210x_disconnect(struct usb_serial *serial)
2192 {
2193         cp210x_gpio_remove(serial);
2194 }
2195
2196 static void cp210x_release(struct usb_serial *serial)
2197 {
2198         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2199
2200         cp210x_gpio_remove(serial);
2201
2202         kfree(priv);
2203 }
2204
2205 module_usb_serial_driver(serial_drivers, id_table);
2206
2207 MODULE_DESCRIPTION(DRIVER_DESC);
2208 MODULE_LICENSE("GPL v2");