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                                 const struct ktermios *);
  35 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
  36                                const 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(0x0404, 0x034C) }, /* NCR Retail IO Box */
  55         { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
  56         { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
  57         { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  58         { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  59         { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
  60         { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
  61         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
  62         { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
  63         { USB_DEVICE(0x0908, 0x0070) }, /* Siemens SCALANCE LPE-9000 USB Serial Console */
  64         { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
  65         { USB_DEVICE(0x0988, 0x0578) }, /* Teraoka AD2000 */
  66         { USB_DEVICE(0x0B00, 0x3070) }, /* Ingenico 3070 */
  67         { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
  68         { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
  69         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  70         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
  71         { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
  72         { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
  73         { USB_DEVICE(0x106F, 0x0003) }, /* CPI / Money Controls Bulk Coin Recycler */
  74         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  75         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  76         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  77         { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
  78         { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
  79         { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
  80         { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
  81         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  82         { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
  83         { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
  84         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
  85         { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
  86         { USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */
  87         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  88         { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
  89         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  90         { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
  91         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  92         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
  93         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  94         { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
  95         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  96         { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
  97         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
  98         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
  99         { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
 100         { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
 101         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
 102         { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
 103         { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */
 104         { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */
 105         { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */
 106         { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
 107         { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
 108         { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
 109         { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
 110         { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
 111         { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
 112         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
 113         { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
 114         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
 115         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
 116         { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
 117         { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
 118         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
 119         { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
 120         { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
 121         { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
 122         { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
 123         { USB_DEVICE(0x10C4, 0x82AA) }, /* Silicon Labs IFS-USB-DATACABLE used with Quint UPS */
 124         { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */
 125         { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */
 126         { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */
 127         { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
 128         { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
 129         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
 130         { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
 131         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
 132         { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */
 133         { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
 134         { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
 135         { USB_DEVICE(0x10C4, 0x8414) }, /* Decagon USB Cable Adapter */
 136         { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
 137         { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
 138         { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
 139         { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
 140         { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
 141         { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */
 142         { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */
 143         { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */
 144         { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
 145         { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
 146         { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
 147         { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
 148         { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
 149         { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
 150         { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
 151         { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
 152         { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
 153         { USB_DEVICE(0x10C4, 0x88D8) }, /* Acuity Brands nLight Air Adapter */
 154         { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */
 155         { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */
 156         { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
 157         { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
 158         { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
 159         { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
 160         { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */
 161         { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */
 162         { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
 163         { USB_DEVICE(0x10C4, 0x8A5B) }, /* CEL EM3588 ZigBee USB Stick */
 164         { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
 165         { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
 166         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 167         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 168         { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */
 169         { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
 170         { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
 171         { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */
 172         { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */
 173         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 174         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 175         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 176         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 177         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 178         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 179         { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
 180         { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
 181         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 182         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 183         { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */
 184         { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
 185         { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
 186         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 187         { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
 188         { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
 189         { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
 190         { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
 191         { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
 192         { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
 193         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 194         { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
 195         { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
 196         { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
 197         { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
 198         { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
 199         { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
 200         { USB_DEVICE(0x17A8, 0x0011) }, /* Kamstrup 444 MHz RF sniffer */
 201         { USB_DEVICE(0x17A8, 0x0013) }, /* Kamstrup 870 MHz RF sniffer */
 202         { USB_DEVICE(0x17A8, 0x0101) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Int Ant) */
 203         { USB_DEVICE(0x17A8, 0x0102) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Ext Ant) */
 204         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
 205         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
 206         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 207         { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
 208         { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
 209         { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
 210         { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
 211         { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
 212         { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
 213         { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
 214         { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
 215         { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 M.2 Key E serial interface */
 216         { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 Display serial interface */
 217         { USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */
 218         { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
 219         { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
 220         { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
 221         { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
 222         { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
 223         { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
 224         { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
 225         { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
 226         { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
 227         { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
 228         { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
 229         { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
 230         { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
 231         { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
 232         { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
 233         { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
 234         { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
 235         { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
 236         { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
 237         { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
 238         { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
 239         { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
 240         { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
 241         { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
 242         { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
 243         { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
 244         { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
 245         { USB_DEVICE(0x2184, 0x0030) }, /* GW Instek GDM-834x Digital Multimeter */
 246         { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
 247         { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
 248         { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
 249         { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
 250         { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
 251         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 252         { } /* Terminating Entry */
 253 };
 254
 255 MODULE_DEVICE_TABLE(usb, id_table);
 256
 257 struct cp210x_serial_private {
 258 #ifdef CONFIG_GPIOLIB
 259         struct gpio_chip        gc;
 260         bool                    gpio_registered;
 261         u16                     gpio_pushpull;
 262         u16                     gpio_altfunc;
 263         u16                     gpio_input;
 264 #endif
 265         u8                      partnum;
 266         u32                     fw_version;
 267         speed_t                 min_speed;
 268         speed_t                 max_speed;
 269         bool                    use_actual_rate;
 270         bool                    no_flow_control;
 271         bool                    no_event_mode;
 272 };
 273
 274 enum cp210x_event_state {
 275         ES_DATA,
 276         ES_ESCAPE,
 277         ES_LSR,
 278         ES_LSR_DATA_0,
 279         ES_LSR_DATA_1,
 280         ES_MSR
 281 };
 282
 283 struct cp210x_port_private {
 284         u8                      bInterfaceNumber;
 285         bool                    event_mode;
 286         enum cp210x_event_state event_state;
 287         u8                      lsr;
 288
 289         struct mutex            mutex;
 290         bool                    crtscts;
 291         bool                    dtr;
 292         bool                    rts;
 293 };
 294
 295 static struct usb_serial_driver cp210x_device = {
 296         .driver = {
 297                 .owner =        THIS_MODULE,
 298                 .name =         "cp210x",
 299         },
 300         .id_table               = id_table,
 301         .num_ports              = 1,
 302         .bulk_in_size           = 256,
 303         .bulk_out_size          = 256,
 304         .open                   = cp210x_open,
 305         .close                  = cp210x_close,
 306         .break_ctl              = cp210x_break_ctl,
 307         .set_termios            = cp210x_set_termios,
 308         .tx_empty               = cp210x_tx_empty,
 309         .throttle               = usb_serial_generic_throttle,
 310         .unthrottle             = usb_serial_generic_unthrottle,
 311         .tiocmget               = cp210x_tiocmget,
 312         .tiocmset               = cp210x_tiocmset,
 313         .get_icount             = usb_serial_generic_get_icount,
 314         .attach                 = cp210x_attach,
 315         .disconnect             = cp210x_disconnect,
 316         .release                = cp210x_release,
 317         .port_probe             = cp210x_port_probe,
 318         .port_remove            = cp210x_port_remove,
 319         .dtr_rts                = cp210x_dtr_rts,
 320         .process_read_urb       = cp210x_process_read_urb,
 321 };
 322
 323 static struct usb_serial_driver * const serial_drivers[] = {
 324         &cp210x_device, NULL
 325 };
 326
 327 /* Config request types */
 328 #define REQTYPE_HOST_TO_INTERFACE       0x41
 329 #define REQTYPE_INTERFACE_TO_HOST       0xc1
 330 #define REQTYPE_HOST_TO_DEVICE  0x40
 331 #define REQTYPE_DEVICE_TO_HOST  0xc0
 332
 333 /* Config request codes */
 334 #define CP210X_IFC_ENABLE       0x00
 335 #define CP210X_SET_BAUDDIV      0x01
 336 #define CP210X_GET_BAUDDIV      0x02
 337 #define CP210X_SET_LINE_CTL     0x03
 338 #define CP210X_GET_LINE_CTL     0x04
 339 #define CP210X_SET_BREAK        0x05
 340 #define CP210X_IMM_CHAR         0x06
 341 #define CP210X_SET_MHS          0x07
 342 #define CP210X_GET_MDMSTS       0x08
 343 #define CP210X_SET_XON          0x09
 344 #define CP210X_SET_XOFF         0x0A
 345 #define CP210X_SET_EVENTMASK    0x0B
 346 #define CP210X_GET_EVENTMASK    0x0C
 347 #define CP210X_SET_CHAR         0x0D
 348 #define CP210X_GET_CHARS        0x0E
 349 #define CP210X_GET_PROPS        0x0F
 350 #define CP210X_GET_COMM_STATUS  0x10
 351 #define CP210X_RESET            0x11
 352 #define CP210X_PURGE            0x12
 353 #define CP210X_SET_FLOW         0x13
 354 #define CP210X_GET_FLOW         0x14
 355 #define CP210X_EMBED_EVENTS     0x15
 356 #define CP210X_GET_EVENTSTATE   0x16
 357 #define CP210X_SET_CHARS        0x19
 358 #define CP210X_GET_BAUDRATE     0x1D
 359 #define CP210X_SET_BAUDRATE     0x1E
 360 #define CP210X_VENDOR_SPECIFIC  0xFF
 361
 362 /* CP210X_IFC_ENABLE */
 363 #define UART_ENABLE             0x0001
 364 #define UART_DISABLE            0x0000
 365
 366 /* CP210X_(SET|GET)_BAUDDIV */
 367 #define BAUD_RATE_GEN_FREQ      0x384000
 368
 369 /* CP210X_(SET|GET)_LINE_CTL */
 370 #define BITS_DATA_MASK          0X0f00
 371 #define BITS_DATA_5             0X0500
 372 #define BITS_DATA_6             0X0600
 373 #define BITS_DATA_7             0X0700
 374 #define BITS_DATA_8             0X0800
 375 #define BITS_DATA_9             0X0900
 376
 377 #define BITS_PARITY_MASK        0x00f0
 378 #define BITS_PARITY_NONE        0x0000
 379 #define BITS_PARITY_ODD         0x0010
 380 #define BITS_PARITY_EVEN        0x0020
 381 #define BITS_PARITY_MARK        0x0030
 382 #define BITS_PARITY_SPACE       0x0040
 383
 384 #define BITS_STOP_MASK          0x000f
 385 #define BITS_STOP_1             0x0000
 386 #define BITS_STOP_1_5           0x0001
 387 #define BITS_STOP_2             0x0002
 388
 389 /* CP210X_SET_BREAK */
 390 #define BREAK_ON                0x0001
 391 #define BREAK_OFF               0x0000
 392
 393 /* CP210X_(SET_MHS|GET_MDMSTS) */
 394 #define CONTROL_DTR             0x0001
 395 #define CONTROL_RTS             0x0002
 396 #define CONTROL_CTS             0x0010
 397 #define CONTROL_DSR             0x0020
 398 #define CONTROL_RING            0x0040
 399 #define CONTROL_DCD             0x0080
 400 #define CONTROL_WRITE_DTR       0x0100
 401 #define CONTROL_WRITE_RTS       0x0200
 402
 403 /* CP210X_(GET|SET)_CHARS */
 404 struct cp210x_special_chars {
 405         u8      bEofChar;
 406         u8      bErrorChar;
 407         u8      bBreakChar;
 408         u8      bEventChar;
 409         u8      bXonChar;
 410         u8      bXoffChar;
 411 };
 412
 413 /* CP210X_VENDOR_SPECIFIC values */
 414 #define CP210X_GET_FW_VER       0x000E
 415 #define CP210X_READ_2NCONFIG    0x000E
 416 #define CP210X_GET_FW_VER_2N    0x0010
 417 #define CP210X_READ_LATCH       0x00C2
 418 #define CP210X_GET_PARTNUM      0x370B
 419 #define CP210X_GET_PORTCONFIG   0x370C
 420 #define CP210X_GET_DEVICEMODE   0x3711
 421 #define CP210X_WRITE_LATCH      0x37E1
 422
 423 /* Part number definitions */
 424 #define CP210X_PARTNUM_CP2101   0x01
 425 #define CP210X_PARTNUM_CP2102   0x02
 426 #define CP210X_PARTNUM_CP2103   0x03
 427 #define CP210X_PARTNUM_CP2104   0x04
 428 #define CP210X_PARTNUM_CP2105   0x05
 429 #define CP210X_PARTNUM_CP2108   0x08
 430 #define CP210X_PARTNUM_CP2102N_QFN28    0x20
 431 #define CP210X_PARTNUM_CP2102N_QFN24    0x21
 432 #define CP210X_PARTNUM_CP2102N_QFN20    0x22
 433 #define CP210X_PARTNUM_UNKNOWN  0xFF
 434
 435 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
 436 struct cp210x_comm_status {
 437         __le32   ulErrors;
 438         __le32   ulHoldReasons;
 439         __le32   ulAmountInInQueue;
 440         __le32   ulAmountInOutQueue;
 441         u8       bEofReceived;
 442         u8       bWaitForImmediate;
 443         u8       bReserved;
 444 } __packed;
 445
 446 /*
 447  * CP210X_PURGE - 16 bits passed in wValue of USB request.
 448  * SiLabs app note AN571 gives a strange description of the 4 bits:
 449  * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
 450  * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
 451  */
 452 #define PURGE_ALL               0x000f
 453
 454 /* CP210X_EMBED_EVENTS */
 455 #define CP210X_ESCCHAR          0xec
 456
 457 #define CP210X_LSR_OVERRUN      BIT(1)
 458 #define CP210X_LSR_PARITY       BIT(2)
 459 #define CP210X_LSR_FRAME        BIT(3)
 460 #define CP210X_LSR_BREAK        BIT(4)
 461
 462
 463 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
 464 struct cp210x_flow_ctl {
 465         __le32  ulControlHandshake;
 466         __le32  ulFlowReplace;
 467         __le32  ulXonLimit;
 468         __le32  ulXoffLimit;
 469 };
 470
 471 /* cp210x_flow_ctl::ulControlHandshake */
 472 #define CP210X_SERIAL_DTR_MASK          GENMASK(1, 0)
 473 #define CP210X_SERIAL_DTR_INACTIVE      (0 << 0)
 474 #define CP210X_SERIAL_DTR_ACTIVE        (1 << 0)
 475 #define CP210X_SERIAL_DTR_FLOW_CTL      (2 << 0)
 476 #define CP210X_SERIAL_CTS_HANDSHAKE     BIT(3)
 477 #define CP210X_SERIAL_DSR_HANDSHAKE     BIT(4)
 478 #define CP210X_SERIAL_DCD_HANDSHAKE     BIT(5)
 479 #define CP210X_SERIAL_DSR_SENSITIVITY   BIT(6)
 480
 481 /* cp210x_flow_ctl::ulFlowReplace */
 482 #define CP210X_SERIAL_AUTO_TRANSMIT     BIT(0)
 483 #define CP210X_SERIAL_AUTO_RECEIVE      BIT(1)
 484 #define CP210X_SERIAL_ERROR_CHAR        BIT(2)
 485 #define CP210X_SERIAL_NULL_STRIPPING    BIT(3)
 486 #define CP210X_SERIAL_BREAK_CHAR        BIT(4)
 487 #define CP210X_SERIAL_RTS_MASK          GENMASK(7, 6)
 488 #define CP210X_SERIAL_RTS_INACTIVE      (0 << 6)
 489 #define CP210X_SERIAL_RTS_ACTIVE        (1 << 6)
 490 #define CP210X_SERIAL_RTS_FLOW_CTL      (2 << 6)
 491 #define CP210X_SERIAL_XOFF_CONTINUE     BIT(31)
 492
 493 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
 494 struct cp210x_pin_mode {
 495         u8      eci;
 496         u8      sci;
 497 };
 498
 499 #define CP210X_PIN_MODE_MODEM           0
 500 #define CP210X_PIN_MODE_GPIO            BIT(0)
 501
 502 /*
 503  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes
 504  * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes.
 505  */
 506 struct cp210x_dual_port_config {
 507         __le16  gpio_mode;
 508         u8      __pad0[2];
 509         __le16  reset_state;
 510         u8      __pad1[4];
 511         __le16  suspend_state;
 512         u8      sci_cfg;
 513         u8      eci_cfg;
 514         u8      device_cfg;
 515 } __packed;
 516
 517 /*
 518  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes
 519  * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes.
 520  */
 521 struct cp210x_single_port_config {
 522         __le16  gpio_mode;
 523         u8      __pad0[2];
 524         __le16  reset_state;
 525         u8      __pad1[4];
 526         __le16  suspend_state;
 527         u8      device_cfg;
 528 } __packed;
 529
 530 /* GPIO modes */
 531 #define CP210X_SCI_GPIO_MODE_OFFSET     9
 532 #define CP210X_SCI_GPIO_MODE_MASK       GENMASK(11, 9)
 533
 534 #define CP210X_ECI_GPIO_MODE_OFFSET     2
 535 #define CP210X_ECI_GPIO_MODE_MASK       GENMASK(3, 2)
 536
 537 #define CP210X_GPIO_MODE_OFFSET         8
 538 #define CP210X_GPIO_MODE_MASK           GENMASK(11, 8)
 539
 540 /* CP2105 port configuration values */
 541 #define CP2105_GPIO0_TXLED_MODE         BIT(0)
 542 #define CP2105_GPIO1_RXLED_MODE         BIT(1)
 543 #define CP2105_GPIO1_RS485_MODE         BIT(2)
 544
 545 /* CP2104 port configuration values */
 546 #define CP2104_GPIO0_TXLED_MODE         BIT(0)
 547 #define CP2104_GPIO1_RXLED_MODE         BIT(1)
 548 #define CP2104_GPIO2_RS485_MODE         BIT(2)
 549
 550 struct cp210x_quad_port_state {
 551         __le16 gpio_mode_pb0;
 552         __le16 gpio_mode_pb1;
 553         __le16 gpio_mode_pb2;
 554         __le16 gpio_mode_pb3;
 555         __le16 gpio_mode_pb4;
 556
 557         __le16 gpio_lowpower_pb0;
 558         __le16 gpio_lowpower_pb1;
 559         __le16 gpio_lowpower_pb2;
 560         __le16 gpio_lowpower_pb3;
 561         __le16 gpio_lowpower_pb4;
 562
 563         __le16 gpio_latch_pb0;
 564         __le16 gpio_latch_pb1;
 565         __le16 gpio_latch_pb2;
 566         __le16 gpio_latch_pb3;
 567         __le16 gpio_latch_pb4;
 568 };
 569
 570 /*
 571  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0x49 bytes
 572  * on a CP2108 chip.
 573  *
 574  * See https://www.silabs.com/documents/public/application-notes/an978-cp210x-usb-to-uart-api-specification.pdf
 575  */
 576 struct cp210x_quad_port_config {
 577         struct cp210x_quad_port_state reset_state;
 578         struct cp210x_quad_port_state suspend_state;
 579         u8 ipdelay_ifc[4];
 580         u8 enhancedfxn_ifc[4];
 581         u8 enhancedfxn_device;
 582         u8 extclkfreq[4];
 583 } __packed;
 584
 585 #define CP2108_EF_IFC_GPIO_TXLED                0x01
 586 #define CP2108_EF_IFC_GPIO_RXLED                0x02
 587 #define CP2108_EF_IFC_GPIO_RS485                0x04
 588 #define CP2108_EF_IFC_GPIO_RS485_LOGIC          0x08
 589 #define CP2108_EF_IFC_GPIO_CLOCK                0x10
 590 #define CP2108_EF_IFC_DYNAMIC_SUSPEND           0x40
 591
 592 /* CP2102N configuration array indices */
 593 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX      2
 594 #define CP210X_2NCONFIG_GPIO_MODE_IDX           581
 595 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX       587
 596 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX        600
 597
 598 /* CP2102N QFN20 port configuration values */
 599 #define CP2102N_QFN20_GPIO2_TXLED_MODE          BIT(2)
 600 #define CP2102N_QFN20_GPIO3_RXLED_MODE          BIT(3)
 601 #define CP2102N_QFN20_GPIO1_RS485_MODE          BIT(4)
 602 #define CP2102N_QFN20_GPIO0_CLK_MODE            BIT(6)
 603
 604 /*
 605  * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x02 bytes
 606  * for CP2102N, CP2103, CP2104 and CP2105.
 607  */
 608 struct cp210x_gpio_write {
 609         u8      mask;
 610         u8      state;
 611 };
 612
 613 /*
 614  * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x04 bytes
 615  * for CP2108.
 616  */
 617 struct cp210x_gpio_write16 {
 618         __le16  mask;
 619         __le16  state;
 620 };
 621
 622 /*
 623  * Helper to get interface number when we only have struct usb_serial.
 624  */
 625 static u8 cp210x_interface_num(struct usb_serial *serial)
 626 {
 627         struct usb_host_interface *cur_altsetting;
 628
 629         cur_altsetting = serial->interface->cur_altsetting;
 630
 631         return cur_altsetting->desc.bInterfaceNumber;
 632 }
 633
 634 /*
 635  * Reads a variable-sized block of CP210X_ registers, identified by req.
 636  * Returns data into buf in native USB byte order.
 637  */
 638 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
 639                 void *buf, int bufsize)
 640 {
 641         struct usb_serial *serial = port->serial;
 642         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 643         int result;
 644
 645
 646         result = usb_control_msg_recv(serial->dev, 0, req,
 647                         REQTYPE_INTERFACE_TO_HOST, 0,
 648                         port_priv->bInterfaceNumber, buf, bufsize,
 649                         USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
 650         if (result) {
 651                 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
 652                                 req, bufsize, result);
 653                 return result;
 654         }
 655
 656         return 0;
 657 }
 658
 659 /*
 660  * Reads any 8-bit CP210X_ register identified by req.
 661  */
 662 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
 663 {
 664         return cp210x_read_reg_block(port, req, val, sizeof(*val));
 665 }
 666
 667 /*
 668  * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
 669  * Returns data into buf in native USB byte order.
 670  */
 671 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
 672                                     void *buf, int bufsize)
 673 {
 674         int result;
 675
 676         result = usb_control_msg_recv(serial->dev, 0, CP210X_VENDOR_SPECIFIC,
 677                         type, val, cp210x_interface_num(serial), buf, bufsize,
 678                         USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
 679         if (result) {
 680                 dev_err(&serial->interface->dev,
 681                         "failed to get vendor val 0x%04x size %d: %d\n", val,
 682                         bufsize, result);
 683                 return result;
 684         }
 685
 686         return 0;
 687 }
 688
 689 /*
 690  * Writes any 16-bit CP210X_ register (req) whose value is passed
 691  * entirely in the wValue field of the USB request.
 692  */
 693 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
 694 {
 695         struct usb_serial *serial = port->serial;
 696         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 697         int result;
 698
 699         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 700                         req, REQTYPE_HOST_TO_INTERFACE, val,
 701                         port_priv->bInterfaceNumber, NULL, 0,
 702                         USB_CTRL_SET_TIMEOUT);
 703         if (result < 0) {
 704                 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
 705                                 req, result);
 706         }
 707
 708         return result;
 709 }
 710
 711 /*
 712  * Writes a variable-sized block of CP210X_ registers, identified by req.
 713  * Data in buf must be in native USB byte order.
 714  */
 715 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
 716                 void *buf, int bufsize)
 717 {
 718         struct usb_serial *serial = port->serial;
 719         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 720         int result;
 721
 722         result = usb_control_msg_send(serial->dev, 0, req,
 723                         REQTYPE_HOST_TO_INTERFACE, 0,
 724                         port_priv->bInterfaceNumber, buf, bufsize,
 725                         USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
 726         if (result) {
 727                 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
 728                                 req, bufsize, result);
 729                 return result;
 730         }
 731
 732         return 0;
 733 }
 734
 735 /*
 736  * Writes any 32-bit CP210X_ register identified by req.
 737  */
 738 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
 739 {
 740         __le32 le32_val;
 741
 742         le32_val = cpu_to_le32(val);
 743
 744         return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
 745 }
 746
 747 #ifdef CONFIG_GPIOLIB
 748 /*
 749  * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
 750  * Data in buf must be in native USB byte order.
 751  */
 752 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
 753                                      u16 val, void *buf, int bufsize)
 754 {
 755         int result;
 756
 757         result = usb_control_msg_send(serial->dev, 0, CP210X_VENDOR_SPECIFIC,
 758                         type, val, cp210x_interface_num(serial), buf, bufsize,
 759                         USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
 760         if (result) {
 761                 dev_err(&serial->interface->dev,
 762                         "failed to set vendor val 0x%04x size %d: %d\n", val,
 763                         bufsize, result);
 764                 return result;
 765         }
 766
 767         return 0;
 768 }
 769 #endif
 770
 771 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 772 {
 773         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 774         int result;
 775
 776         result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
 777         if (result) {
 778                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
 779                 return result;
 780         }
 781
 782         if (tty)
 783                 cp210x_set_termios(tty, port, NULL);
 784
 785         result = usb_serial_generic_open(tty, port);
 786         if (result)
 787                 goto err_disable;
 788
 789         return 0;
 790
 791 err_disable:
 792         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 793         port_priv->event_mode = false;
 794
 795         return result;
 796 }
 797
 798 static void cp210x_close(struct usb_serial_port *port)
 799 {
 800         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 801
 802         usb_serial_generic_close(port);
 803
 804         /* Clear both queues; cp2108 needs this to avoid an occasional hang */
 805         cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
 806
 807         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 808
 809         /* Disabling the interface disables event-insertion mode. */
 810         port_priv->event_mode = false;
 811 }
 812
 813 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag)
 814 {
 815         if (lsr & CP210X_LSR_BREAK) {
 816                 port->icount.brk++;
 817                 *flag = TTY_BREAK;
 818         } else if (lsr & CP210X_LSR_PARITY) {
 819                 port->icount.parity++;
 820                 *flag = TTY_PARITY;
 821         } else if (lsr & CP210X_LSR_FRAME) {
 822                 port->icount.frame++;
 823                 *flag = TTY_FRAME;
 824         }
 825
 826         if (lsr & CP210X_LSR_OVERRUN) {
 827                 port->icount.overrun++;
 828                 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
 829         }
 830 }
 831
 832 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag)
 833 {
 834         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 835
 836         switch (port_priv->event_state) {
 837         case ES_DATA:
 838                 if (*ch == CP210X_ESCCHAR) {
 839                         port_priv->event_state = ES_ESCAPE;
 840                         break;
 841                 }
 842                 return false;
 843         case ES_ESCAPE:
 844                 switch (*ch) {
 845                 case 0:
 846                         dev_dbg(&port->dev, "%s - escape char\n", __func__);
 847                         *ch = CP210X_ESCCHAR;
 848                         port_priv->event_state = ES_DATA;
 849                         return false;
 850                 case 1:
 851                         port_priv->event_state = ES_LSR_DATA_0;
 852                         break;
 853                 case 2:
 854                         port_priv->event_state = ES_LSR;
 855                         break;
 856                 case 3:
 857                         port_priv->event_state = ES_MSR;
 858                         break;
 859                 default:
 860                         dev_err(&port->dev, "malformed event 0x%02x\n", *ch);
 861                         port_priv->event_state = ES_DATA;
 862                         break;
 863                 }
 864                 break;
 865         case ES_LSR_DATA_0:
 866                 port_priv->lsr = *ch;
 867                 port_priv->event_state = ES_LSR_DATA_1;
 868                 break;
 869         case ES_LSR_DATA_1:
 870                 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n",
 871                                 __func__, port_priv->lsr, *ch);
 872                 cp210x_process_lsr(port, port_priv->lsr, flag);
 873                 port_priv->event_state = ES_DATA;
 874                 return false;
 875         case ES_LSR:
 876                 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch);
 877                 port_priv->lsr = *ch;
 878                 cp210x_process_lsr(port, port_priv->lsr, flag);
 879                 port_priv->event_state = ES_DATA;
 880                 break;
 881         case ES_MSR:
 882                 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch);
 883                 /* unimplemented */
 884                 port_priv->event_state = ES_DATA;
 885                 break;
 886         }
 887
 888         return true;
 889 }
 890
 891 static void cp210x_process_read_urb(struct urb *urb)
 892 {
 893         struct usb_serial_port *port = urb->context;
 894         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 895         unsigned char *ch = urb->transfer_buffer;
 896         char flag;
 897         int i;
 898
 899         if (!urb->actual_length)
 900                 return;
 901
 902         if (port_priv->event_mode) {
 903                 for (i = 0; i < urb->actual_length; i++, ch++) {
 904                         flag = TTY_NORMAL;
 905
 906                         if (cp210x_process_char(port, ch, &flag))
 907                                 continue;
 908
 909                         tty_insert_flip_char(&port->port, *ch, flag);
 910                 }
 911         } else {
 912                 tty_insert_flip_string(&port->port, ch, urb->actual_length);
 913         }
 914         tty_flip_buffer_push(&port->port);
 915 }
 916
 917 /*
 918  * Read how many bytes are waiting in the TX queue.
 919  */
 920 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
 921                 u32 *count)
 922 {
 923         struct usb_serial *serial = port->serial;
 924         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 925         struct cp210x_comm_status sts;
 926         int result;
 927
 928         result = usb_control_msg_recv(serial->dev, 0, CP210X_GET_COMM_STATUS,
 929                         REQTYPE_INTERFACE_TO_HOST, 0,
 930                         port_priv->bInterfaceNumber, &sts, sizeof(sts),
 931                         USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
 932         if (result) {
 933                 dev_err(&port->dev, "failed to get comm status: %d\n", result);
 934                 return result;
 935         }
 936
 937         *count = le32_to_cpu(sts.ulAmountInOutQueue);
 938
 939         return 0;
 940 }
 941
 942 static bool cp210x_tx_empty(struct usb_serial_port *port)
 943 {
 944         int err;
 945         u32 count;
 946
 947         err = cp210x_get_tx_queue_byte_count(port, &count);
 948         if (err)
 949                 return true;
 950
 951         return !count;
 952 }
 953
 954 struct cp210x_rate {
 955         speed_t rate;
 956         speed_t high;
 957 };
 958
 959 static const struct cp210x_rate cp210x_an205_table1[] = {
 960         { 300, 300 },
 961         { 600, 600 },
 962         { 1200, 1200 },
 963         { 1800, 1800 },
 964         { 2400, 2400 },
 965         { 4000, 4000 },
 966         { 4800, 4803 },
 967         { 7200, 7207 },
 968         { 9600, 9612 },
 969         { 14400, 14428 },
 970         { 16000, 16062 },
 971         { 19200, 19250 },
 972         { 28800, 28912 },
 973         { 38400, 38601 },
 974         { 51200, 51558 },
 975         { 56000, 56280 },
 976         { 57600, 58053 },
 977         { 64000, 64111 },
 978         { 76800, 77608 },
 979         { 115200, 117028 },
 980         { 128000, 129347 },
 981         { 153600, 156868 },
 982         { 230400, 237832 },
 983         { 250000, 254234 },
 984         { 256000, 273066 },
 985         { 460800, 491520 },
 986         { 500000, 567138 },
 987         { 576000, 670254 },
 988         { 921600, UINT_MAX }
 989 };
 990
 991 /*
 992  * Quantises the baud rate as per AN205 Table 1
 993  */
 994 static speed_t cp210x_get_an205_rate(speed_t baud)
 995 {
 996         int i;
 997
 998         for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) {
 999                 if (baud <= cp210x_an205_table1[i].high)
1000                         break;
1001         }
1002
1003         return cp210x_an205_table1[i].rate;
1004 }
1005
1006 static speed_t cp210x_get_actual_rate(speed_t baud)
1007 {
1008         unsigned int prescale = 1;
1009         unsigned int div;
1010
1011         if (baud <= 365)
1012                 prescale = 4;
1013
1014         div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud);
1015         baud = 48000000 / (2 * prescale * div);
1016
1017         return baud;
1018 }
1019
1020 /*
1021  * CP2101 supports the following baud rates:
1022  *
1023  *      300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1024  *      38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1025  *
1026  * CP2102 and CP2103 support the following additional rates:
1027  *
1028  *      4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1029  *      576000
1030  *
1031  * The device will map a requested rate to a supported one, but the result
1032  * of requests for rates greater than 1053257 is undefined (see AN205).
1033  *
1034  * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1035  * respectively, with an error less than 1%. The actual rates are determined
1036  * by
1037  *
1038  *      div = round(freq / (2 x prescale x request))
1039  *      actual = freq / (2 x prescale x div)
1040  *
1041  * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1042  * or 1 otherwise.
1043  * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1044  * otherwise.
1045  */
1046 static void cp210x_change_speed(struct tty_struct *tty,
1047                                 struct usb_serial_port *port,
1048                                 const struct ktermios *old_termios)
1049 {
1050         struct usb_serial *serial = port->serial;
1051         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1052         u32 baud;
1053
1054         if (tty->termios.c_ospeed == 0)
1055                 return;
1056
1057         /*
1058          * This maps the requested rate to the actual rate, a valid rate on
1059          * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed].
1060          */
1061         baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed);
1062
1063         if (priv->use_actual_rate)
1064                 baud = cp210x_get_actual_rate(baud);
1065         else if (baud < 1000000)
1066                 baud = cp210x_get_an205_rate(baud);
1067
1068         dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1069         if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1070                 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1071                 if (old_termios)
1072                         baud = old_termios->c_ospeed;
1073                 else
1074                         baud = 9600;
1075         }
1076
1077         tty_encode_baud_rate(tty, baud, baud);
1078 }
1079
1080 static void cp210x_enable_event_mode(struct usb_serial_port *port)
1081 {
1082         struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1083         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1084         int ret;
1085
1086         if (port_priv->event_mode)
1087                 return;
1088
1089         if (priv->no_event_mode)
1090                 return;
1091
1092         port_priv->event_state = ES_DATA;
1093         port_priv->event_mode = true;
1094
1095         ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR);
1096         if (ret) {
1097                 dev_err(&port->dev, "failed to enable events: %d\n", ret);
1098                 port_priv->event_mode = false;
1099         }
1100 }
1101
1102 static void cp210x_disable_event_mode(struct usb_serial_port *port)
1103 {
1104         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1105         int ret;
1106
1107         if (!port_priv->event_mode)
1108                 return;
1109
1110         ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0);
1111         if (ret) {
1112                 dev_err(&port->dev, "failed to disable events: %d\n", ret);
1113                 return;
1114         }
1115
1116         port_priv->event_mode = false;
1117 }
1118
1119 static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b)
1120 {
1121         bool iflag_change, cc_change;
1122
1123         iflag_change = ((a->c_iflag ^ b->c_iflag) & (INPCK | IXON | IXOFF));
1124         cc_change = a->c_cc[VSTART] != b->c_cc[VSTART] ||
1125                         a->c_cc[VSTOP] != b->c_cc[VSTOP];
1126
1127         return tty_termios_hw_change(a, b) || iflag_change || cc_change;
1128 }
1129
1130 static void cp210x_set_flow_control(struct tty_struct *tty,
1131                                     struct usb_serial_port *port,
1132                                     const struct ktermios *old_termios)
1133 {
1134         struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1135         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1136         struct cp210x_special_chars chars;
1137         struct cp210x_flow_ctl flow_ctl;
1138         u32 flow_repl;
1139         u32 ctl_hs;
1140         bool crtscts;
1141         int ret;
1142
1143         /*
1144          * Some CP2102N interpret ulXonLimit as ulFlowReplace (erratum
1145          * CP2102N_E104). Report back that flow control is not supported.
1146          */
1147         if (priv->no_flow_control) {
1148                 tty->termios.c_cflag &= ~CRTSCTS;
1149                 tty->termios.c_iflag &= ~(IXON | IXOFF);
1150         }
1151
1152         if (tty->termios.c_ospeed != 0 &&
1153                         old_termios && old_termios->c_ospeed != 0 &&
1154                         C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) &&
1155                         I_IXON(tty) == (old_termios->c_iflag & IXON) &&
1156                         I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) &&
1157                         START_CHAR(tty) == old_termios->c_cc[VSTART] &&
1158                         STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) {
1159                 return;
1160         }
1161
1162         if (I_IXON(tty) || I_IXOFF(tty)) {
1163                 memset(&chars, 0, sizeof(chars));
1164
1165                 chars.bXonChar = START_CHAR(tty);
1166                 chars.bXoffChar = STOP_CHAR(tty);
1167
1168                 ret = cp210x_write_reg_block(port, CP210X_SET_CHARS, &chars,
1169                                 sizeof(chars));
1170                 if (ret) {
1171                         dev_err(&port->dev, "failed to set special chars: %d\n",
1172                                         ret);
1173                 }
1174         }
1175
1176         mutex_lock(&port_priv->mutex);
1177
1178         if (tty->termios.c_ospeed == 0) {
1179                 port_priv->dtr = false;
1180                 port_priv->rts = false;
1181         } else if (old_termios && old_termios->c_ospeed == 0) {
1182                 port_priv->dtr = true;
1183                 port_priv->rts = true;
1184         }
1185
1186         ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1187                         sizeof(flow_ctl));
1188         if (ret)
1189                 goto out_unlock;
1190
1191         ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1192         flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1193
1194         ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1195         ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1196         ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1197         ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1198         if (port_priv->dtr)
1199                 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
1200         else
1201                 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
1202
1203         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1204         if (C_CRTSCTS(tty)) {
1205                 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1206                 if (port_priv->rts)
1207                         flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
1208                 else
1209                         flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1210                 crtscts = true;
1211         } else {
1212                 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1213                 if (port_priv->rts)
1214                         flow_repl |= CP210X_SERIAL_RTS_ACTIVE;
1215                 else
1216                         flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1217                 crtscts = false;
1218         }
1219
1220         if (I_IXOFF(tty)) {
1221                 flow_repl |= CP210X_SERIAL_AUTO_RECEIVE;
1222
1223                 flow_ctl.ulXonLimit = cpu_to_le32(128);
1224                 flow_ctl.ulXoffLimit = cpu_to_le32(128);
1225         } else {
1226                 flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE;
1227         }
1228
1229         if (I_IXON(tty))
1230                 flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT;
1231         else
1232                 flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT;
1233
1234         dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__,
1235                         ctl_hs, flow_repl);
1236
1237         flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1238         flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1239
1240         ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1241                         sizeof(flow_ctl));
1242         if (ret)
1243                 goto out_unlock;
1244
1245         port_priv->crtscts = crtscts;
1246 out_unlock:
1247         mutex_unlock(&port_priv->mutex);
1248 }
1249
1250 static void cp210x_set_termios(struct tty_struct *tty,
1251                                struct usb_serial_port *port,
1252                                const struct ktermios *old_termios)
1253 {
1254         struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1255         u16 bits;
1256         int ret;
1257
1258         if (old_termios && !cp210x_termios_change(&tty->termios, old_termios) &&
1259                         tty->termios.c_ospeed != 0)
1260                 return;
1261
1262         if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed)
1263                 cp210x_change_speed(tty, port, old_termios);
1264
1265         /* CP2101 only supports CS8, 1 stop bit and non-stick parity. */
1266         if (priv->partnum == CP210X_PARTNUM_CP2101) {
1267                 tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR);
1268                 tty->termios.c_cflag |= CS8;
1269         }
1270
1271         bits = 0;
1272
1273         switch (C_CSIZE(tty)) {
1274         case CS5:
1275                 bits |= BITS_DATA_5;
1276                 break;
1277         case CS6:
1278                 bits |= BITS_DATA_6;
1279                 break;
1280         case CS7:
1281                 bits |= BITS_DATA_7;
1282                 break;
1283         case CS8:
1284         default:
1285                 bits |= BITS_DATA_8;
1286                 break;
1287         }
1288
1289         if (C_PARENB(tty)) {
1290                 if (C_CMSPAR(tty)) {
1291                         if (C_PARODD(tty))
1292                                 bits |= BITS_PARITY_MARK;
1293                         else
1294                                 bits |= BITS_PARITY_SPACE;
1295                 } else {
1296                         if (C_PARODD(tty))
1297                                 bits |= BITS_PARITY_ODD;
1298                         else
1299                                 bits |= BITS_PARITY_EVEN;
1300                 }
1301         }
1302
1303         if (C_CSTOPB(tty))
1304                 bits |= BITS_STOP_2;
1305         else
1306                 bits |= BITS_STOP_1;
1307
1308         ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1309         if (ret)
1310                 dev_err(&port->dev, "failed to set line control: %d\n", ret);
1311
1312         cp210x_set_flow_control(tty, port, old_termios);
1313
1314         /*
1315          * Enable event-insertion mode only if input parity checking is
1316          * enabled for now.
1317          */
1318         if (I_INPCK(tty))
1319                 cp210x_enable_event_mode(port);
1320         else
1321                 cp210x_disable_event_mode(port);
1322 }
1323
1324 static int cp210x_tiocmset(struct tty_struct *tty,
1325                 unsigned int set, unsigned int clear)
1326 {
1327         struct usb_serial_port *port = tty->driver_data;
1328         return cp210x_tiocmset_port(port, set, clear);
1329 }
1330
1331 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1332                 unsigned int set, unsigned int clear)
1333 {
1334         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1335         struct cp210x_flow_ctl flow_ctl;
1336         u32 ctl_hs, flow_repl;
1337         u16 control = 0;
1338         int ret;
1339
1340         mutex_lock(&port_priv->mutex);
1341
1342         if (set & TIOCM_RTS) {
1343                 port_priv->rts = true;
1344                 control |= CONTROL_RTS;
1345                 control |= CONTROL_WRITE_RTS;
1346         }
1347         if (set & TIOCM_DTR) {
1348                 port_priv->dtr = true;
1349                 control |= CONTROL_DTR;
1350                 control |= CONTROL_WRITE_DTR;
1351         }
1352         if (clear & TIOCM_RTS) {
1353                 port_priv->rts = false;
1354                 control &= ~CONTROL_RTS;
1355                 control |= CONTROL_WRITE_RTS;
1356         }
1357         if (clear & TIOCM_DTR) {
1358                 port_priv->dtr = false;
1359                 control &= ~CONTROL_DTR;
1360                 control |= CONTROL_WRITE_DTR;
1361         }
1362
1363         /*
1364          * Use SET_FLOW to set DTR and enable/disable auto-RTS when hardware
1365          * flow control is enabled.
1366          */
1367         if (port_priv->crtscts && control & CONTROL_WRITE_RTS) {
1368                 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1369                                 sizeof(flow_ctl));
1370                 if (ret)
1371                         goto out_unlock;
1372
1373                 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1374                 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1375
1376                 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1377                 if (port_priv->dtr)
1378                         ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
1379                 else
1380                         ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
1381
1382                 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1383                 if (port_priv->rts)
1384                         flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
1385                 else
1386                         flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1387
1388                 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1389                 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1390
1391                 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n",
1392                                 __func__, ctl_hs, flow_repl);
1393
1394                 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1395                                 sizeof(flow_ctl));
1396         } else {
1397                 dev_dbg(&port->dev, "%s - control = 0x%04x\n", __func__, control);
1398
1399                 ret = cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1400         }
1401 out_unlock:
1402         mutex_unlock(&port_priv->mutex);
1403
1404         return ret;
1405 }
1406
1407 static void cp210x_dtr_rts(struct usb_serial_port *port, int on)
1408 {
1409         if (on)
1410                 cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0);
1411         else
1412                 cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS);
1413 }
1414
1415 static int cp210x_tiocmget(struct tty_struct *tty)
1416 {
1417         struct usb_serial_port *port = tty->driver_data;
1418         u8 control;
1419         int result;
1420
1421         result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1422         if (result)
1423                 return result;
1424
1425         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1426                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1427                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1428                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1429                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
1430                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
1431
1432         dev_dbg(&port->dev, "%s - control = 0x%02x\n", __func__, control);
1433
1434         return result;
1435 }
1436
1437 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1438 {
1439         struct usb_serial_port *port = tty->driver_data;
1440         u16 state;
1441
1442         if (break_state == 0)
1443                 state = BREAK_OFF;
1444         else
1445                 state = BREAK_ON;
1446         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1447                 state == BREAK_OFF ? "off" : "on");
1448         cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1449 }
1450
1451 #ifdef CONFIG_GPIOLIB
1452 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1453 {
1454         struct usb_serial *serial = gpiochip_get_data(gc);
1455         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1456         u8 req_type;
1457         u16 mask;
1458         int result;
1459         int len;
1460
1461         result = usb_autopm_get_interface(serial->interface);
1462         if (result)
1463                 return result;
1464
1465         switch (priv->partnum) {
1466         case CP210X_PARTNUM_CP2105:
1467                 req_type = REQTYPE_INTERFACE_TO_HOST;
1468                 len = 1;
1469                 break;
1470         case CP210X_PARTNUM_CP2108:
1471                 req_type = REQTYPE_INTERFACE_TO_HOST;
1472                 len = 2;
1473                 break;
1474         default:
1475                 req_type = REQTYPE_DEVICE_TO_HOST;
1476                 len = 1;
1477                 break;
1478         }
1479
1480         mask = 0;
1481         result = cp210x_read_vendor_block(serial, req_type, CP210X_READ_LATCH,
1482                                           &mask, len);
1483
1484         usb_autopm_put_interface(serial->interface);
1485
1486         if (result < 0)
1487                 return result;
1488
1489         le16_to_cpus(&mask);
1490
1491         return !!(mask & BIT(gpio));
1492 }
1493
1494 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1495 {
1496         struct usb_serial *serial = gpiochip_get_data(gc);
1497         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1498         struct cp210x_gpio_write16 buf16;
1499         struct cp210x_gpio_write buf;
1500         u16 mask, state;
1501         u16 wIndex;
1502         int result;
1503
1504         if (value == 1)
1505                 state = BIT(gpio);
1506         else
1507                 state = 0;
1508
1509         mask = BIT(gpio);
1510
1511         result = usb_autopm_get_interface(serial->interface);
1512         if (result)
1513                 goto out;
1514
1515         switch (priv->partnum) {
1516         case CP210X_PARTNUM_CP2105:
1517                 buf.mask = (u8)mask;
1518                 buf.state = (u8)state;
1519                 result = cp210x_write_vendor_block(serial,
1520                                                    REQTYPE_HOST_TO_INTERFACE,
1521                                                    CP210X_WRITE_LATCH, &buf,
1522                                                    sizeof(buf));
1523                 break;
1524         case CP210X_PARTNUM_CP2108:
1525                 buf16.mask = cpu_to_le16(mask);
1526                 buf16.state = cpu_to_le16(state);
1527                 result = cp210x_write_vendor_block(serial,
1528                                                    REQTYPE_HOST_TO_INTERFACE,
1529                                                    CP210X_WRITE_LATCH, &buf16,
1530                                                    sizeof(buf16));
1531                 break;
1532         default:
1533                 wIndex = state << 8 | mask;
1534                 result = usb_control_msg(serial->dev,
1535                                          usb_sndctrlpipe(serial->dev, 0),
1536                                          CP210X_VENDOR_SPECIFIC,
1537                                          REQTYPE_HOST_TO_DEVICE,
1538                                          CP210X_WRITE_LATCH,
1539                                          wIndex,
1540                                          NULL, 0, USB_CTRL_SET_TIMEOUT);
1541                 break;
1542         }
1543
1544         usb_autopm_put_interface(serial->interface);
1545 out:
1546         if (result < 0) {
1547                 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n",
1548                                 result);
1549         }
1550 }
1551
1552 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1553 {
1554         struct usb_serial *serial = gpiochip_get_data(gc);
1555         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1556
1557         return priv->gpio_input & BIT(gpio);
1558 }
1559
1560 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1561 {
1562         struct usb_serial *serial = gpiochip_get_data(gc);
1563         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1564
1565         if (priv->partnum == CP210X_PARTNUM_CP2105) {
1566                 /* hardware does not support an input mode */
1567                 return -ENOTSUPP;
1568         }
1569
1570         /* push-pull pins cannot be changed to be inputs */
1571         if (priv->gpio_pushpull & BIT(gpio))
1572                 return -EINVAL;
1573
1574         /* make sure to release pin if it is being driven low */
1575         cp210x_gpio_set(gc, gpio, 1);
1576
1577         priv->gpio_input |= BIT(gpio);
1578
1579         return 0;
1580 }
1581
1582 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1583                                         int value)
1584 {
1585         struct usb_serial *serial = gpiochip_get_data(gc);
1586         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1587
1588         priv->gpio_input &= ~BIT(gpio);
1589         cp210x_gpio_set(gc, gpio, value);
1590
1591         return 0;
1592 }
1593
1594 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1595                                   unsigned long config)
1596 {
1597         struct usb_serial *serial = gpiochip_get_data(gc);
1598         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1599         enum pin_config_param param = pinconf_to_config_param(config);
1600
1601         /* Succeed only if in correct mode (this can't be set at runtime) */
1602         if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1603             (priv->gpio_pushpull & BIT(gpio)))
1604                 return 0;
1605
1606         if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1607             !(priv->gpio_pushpull & BIT(gpio)))
1608                 return 0;
1609
1610         return -ENOTSUPP;
1611 }
1612
1613 static int cp210x_gpio_init_valid_mask(struct gpio_chip *gc,
1614                 unsigned long *valid_mask, unsigned int ngpios)
1615 {
1616         struct usb_serial *serial = gpiochip_get_data(gc);
1617         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1618         struct device *dev = &serial->interface->dev;
1619         unsigned long altfunc_mask = priv->gpio_altfunc;
1620
1621         bitmap_complement(valid_mask, &altfunc_mask, ngpios);
1622
1623         if (bitmap_empty(valid_mask, ngpios))
1624                 dev_dbg(dev, "no pin configured for GPIO\n");
1625         else
1626                 dev_dbg(dev, "GPIO.%*pbl configured for GPIO\n", ngpios,
1627                                 valid_mask);
1628         return 0;
1629 }
1630
1631 /*
1632  * This function is for configuring GPIO using shared pins, where other signals
1633  * are made unavailable by configuring the use of GPIO. This is believed to be
1634  * only applicable to the cp2105 at this point, the other devices supported by
1635  * this driver that provide GPIO do so in a way that does not impact other
1636  * signals and are thus expected to have very different initialisation.
1637  */
1638 static int cp2105_gpioconf_init(struct usb_serial *serial)
1639 {
1640         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1641         struct cp210x_pin_mode mode;
1642         struct cp210x_dual_port_config config;
1643         u8 intf_num = cp210x_interface_num(serial);
1644         u8 iface_config;
1645         int result;
1646
1647         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1648                                           CP210X_GET_DEVICEMODE, &mode,
1649                                           sizeof(mode));
1650         if (result < 0)
1651                 return result;
1652
1653         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1654                                           CP210X_GET_PORTCONFIG, &config,
1655                                           sizeof(config));
1656         if (result < 0)
1657                 return result;
1658
1659         /*  2 banks of GPIO - One for the pins taken from each serial port */
1660         if (intf_num == 0) {
1661                 priv->gc.ngpio = 2;
1662
1663                 if (mode.eci == CP210X_PIN_MODE_MODEM) {
1664                         /* mark all GPIOs of this interface as reserved */
1665                         priv->gpio_altfunc = 0xff;
1666                         return 0;
1667                 }
1668
1669                 iface_config = config.eci_cfg;
1670                 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1671                                                 CP210X_ECI_GPIO_MODE_MASK) >>
1672                                                 CP210X_ECI_GPIO_MODE_OFFSET);
1673         } else if (intf_num == 1) {
1674                 priv->gc.ngpio = 3;
1675
1676                 if (mode.sci == CP210X_PIN_MODE_MODEM) {
1677                         /* mark all GPIOs of this interface as reserved */
1678                         priv->gpio_altfunc = 0xff;
1679                         return 0;
1680                 }
1681
1682                 iface_config = config.sci_cfg;
1683                 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1684                                                 CP210X_SCI_GPIO_MODE_MASK) >>
1685                                                 CP210X_SCI_GPIO_MODE_OFFSET);
1686         } else {
1687                 return -ENODEV;
1688         }
1689
1690         /* mark all pins which are not in GPIO mode */
1691         if (iface_config & CP2105_GPIO0_TXLED_MODE)     /* GPIO 0 */
1692                 priv->gpio_altfunc |= BIT(0);
1693         if (iface_config & (CP2105_GPIO1_RXLED_MODE |   /* GPIO 1 */
1694                         CP2105_GPIO1_RS485_MODE))
1695                 priv->gpio_altfunc |= BIT(1);
1696
1697         /* driver implementation for CP2105 only supports outputs */
1698         priv->gpio_input = 0;
1699
1700         return 0;
1701 }
1702
1703 static int cp2104_gpioconf_init(struct usb_serial *serial)
1704 {
1705         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1706         struct cp210x_single_port_config config;
1707         u8 iface_config;
1708         u8 gpio_latch;
1709         int result;
1710         u8 i;
1711
1712         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1713                                           CP210X_GET_PORTCONFIG, &config,
1714                                           sizeof(config));
1715         if (result < 0)
1716                 return result;
1717
1718         priv->gc.ngpio = 4;
1719
1720         iface_config = config.device_cfg;
1721         priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1722                                         CP210X_GPIO_MODE_MASK) >>
1723                                         CP210X_GPIO_MODE_OFFSET);
1724         gpio_latch = (u8)((le16_to_cpu(config.reset_state) &
1725                                         CP210X_GPIO_MODE_MASK) >>
1726                                         CP210X_GPIO_MODE_OFFSET);
1727
1728         /* mark all pins which are not in GPIO mode */
1729         if (iface_config & CP2104_GPIO0_TXLED_MODE)     /* GPIO 0 */
1730                 priv->gpio_altfunc |= BIT(0);
1731         if (iface_config & CP2104_GPIO1_RXLED_MODE)     /* GPIO 1 */
1732                 priv->gpio_altfunc |= BIT(1);
1733         if (iface_config & CP2104_GPIO2_RS485_MODE)     /* GPIO 2 */
1734                 priv->gpio_altfunc |= BIT(2);
1735
1736         /*
1737          * Like CP2102N, CP2104 has also no strict input and output pin
1738          * modes.
1739          * Do the same input mode emulation as CP2102N.
1740          */
1741         for (i = 0; i < priv->gc.ngpio; ++i) {
1742                 /*
1743                  * Set direction to "input" iff pin is open-drain and reset
1744                  * value is 1.
1745                  */
1746                 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1747                         priv->gpio_input |= BIT(i);
1748         }
1749
1750         return 0;
1751 }
1752
1753 static int cp2108_gpio_init(struct usb_serial *serial)
1754 {
1755         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1756         struct cp210x_quad_port_config config;
1757         u16 gpio_latch;
1758         int result;
1759         u8 i;
1760
1761         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1762                                           CP210X_GET_PORTCONFIG, &config,
1763                                           sizeof(config));
1764         if (result < 0)
1765                 return result;
1766
1767         priv->gc.ngpio = 16;
1768         priv->gpio_pushpull = le16_to_cpu(config.reset_state.gpio_mode_pb1);
1769         gpio_latch = le16_to_cpu(config.reset_state.gpio_latch_pb1);
1770
1771         /*
1772          * Mark all pins which are not in GPIO mode.
1773          *
1774          * Refer to table 9.1 "GPIO Mode alternate Functions" in the datasheet:
1775          * https://www.silabs.com/documents/public/data-sheets/cp2108-datasheet.pdf
1776          *
1777          * Alternate functions of GPIO0 to GPIO3 are determine by enhancedfxn_ifc[0]
1778          * and the similarly for the other pins; enhancedfxn_ifc[1]: GPIO4 to GPIO7,
1779          * enhancedfxn_ifc[2]: GPIO8 to GPIO11, enhancedfxn_ifc[3]: GPIO12 to GPIO15.
1780          */
1781         for (i = 0; i < 4; i++) {
1782                 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_TXLED)
1783                         priv->gpio_altfunc |= BIT(i * 4);
1784                 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RXLED)
1785                         priv->gpio_altfunc |= BIT((i * 4) + 1);
1786                 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RS485)
1787                         priv->gpio_altfunc |= BIT((i * 4) + 2);
1788                 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_CLOCK)
1789                         priv->gpio_altfunc |= BIT((i * 4) + 3);
1790         }
1791
1792         /*
1793          * Like CP2102N, CP2108 has also no strict input and output pin
1794          * modes. Do the same input mode emulation as CP2102N.
1795          */
1796         for (i = 0; i < priv->gc.ngpio; ++i) {
1797                 /*
1798                  * Set direction to "input" iff pin is open-drain and reset
1799                  * value is 1.
1800                  */
1801                 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1802                         priv->gpio_input |= BIT(i);
1803         }
1804
1805         return 0;
1806 }
1807
1808 static int cp2102n_gpioconf_init(struct usb_serial *serial)
1809 {
1810         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1811         const u16 config_size = 0x02a6;
1812         u8 gpio_rst_latch;
1813         u8 config_version;
1814         u8 gpio_pushpull;
1815         u8 *config_buf;
1816         u8 gpio_latch;
1817         u8 gpio_ctrl;
1818         int result;
1819         u8 i;
1820
1821         /*
1822          * Retrieve device configuration from the device.
1823          * The array received contains all customization settings done at the
1824          * factory/manufacturer. Format of the array is documented at the
1825          * time of writing at:
1826          * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa
1827          */
1828         config_buf = kmalloc(config_size, GFP_KERNEL);
1829         if (!config_buf)
1830                 return -ENOMEM;
1831
1832         result = cp210x_read_vendor_block(serial,
1833                                           REQTYPE_DEVICE_TO_HOST,
1834                                           CP210X_READ_2NCONFIG,
1835                                           config_buf,
1836                                           config_size);
1837         if (result < 0) {
1838                 kfree(config_buf);
1839                 return result;
1840         }
1841
1842         config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX];
1843         gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX];
1844         gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX];
1845         gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX];
1846
1847         kfree(config_buf);
1848
1849         /* Make sure this is a config format we understand. */
1850         if (config_version != 0x01)
1851                 return -ENOTSUPP;
1852
1853         priv->gc.ngpio = 4;
1854
1855         /*
1856          * Get default pin states after reset. Needed so we can determine
1857          * the direction of an open-drain pin.
1858          */
1859         gpio_latch = (gpio_rst_latch >> 3) & 0x0f;
1860
1861         /* 0 indicates open-drain mode, 1 is push-pull */
1862         priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f;
1863
1864         /* 0 indicates GPIO mode, 1 is alternate function */
1865         if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) {
1866                 /* QFN20 is special... */
1867                 if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE)   /* GPIO 0 */
1868                         priv->gpio_altfunc |= BIT(0);
1869                 if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */
1870                         priv->gpio_altfunc |= BIT(1);
1871                 if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */
1872                         priv->gpio_altfunc |= BIT(2);
1873                 if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */
1874                         priv->gpio_altfunc |= BIT(3);
1875         } else {
1876                 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f;
1877         }
1878
1879         if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) {
1880                 /*
1881                  * For the QFN28 package, GPIO4-6 are controlled by
1882                  * the low three bits of the mode/latch fields.
1883                  * Contrary to the document linked above, the bits for
1884                  * the SUSPEND pins are elsewhere.  No alternate
1885                  * function is available for these pins.
1886                  */
1887                 priv->gc.ngpio = 7;
1888                 gpio_latch |= (gpio_rst_latch & 7) << 4;
1889                 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4;
1890         }
1891
1892         /*
1893          * The CP2102N does not strictly has input and output pin modes,
1894          * it only knows open-drain and push-pull modes which is set at
1895          * factory. An open-drain pin can function both as an
1896          * input or an output. We emulate input mode for open-drain pins
1897          * by making sure they are not driven low, and we do not allow
1898          * push-pull pins to be set as an input.
1899          */
1900         for (i = 0; i < priv->gc.ngpio; ++i) {
1901                 /*
1902                  * Set direction to "input" iff pin is open-drain and reset
1903                  * value is 1.
1904                  */
1905                 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1906                         priv->gpio_input |= BIT(i);
1907         }
1908
1909         return 0;
1910 }
1911
1912 static int cp210x_gpio_init(struct usb_serial *serial)
1913 {
1914         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1915         int result;
1916
1917         switch (priv->partnum) {
1918         case CP210X_PARTNUM_CP2104:
1919                 result = cp2104_gpioconf_init(serial);
1920                 break;
1921         case CP210X_PARTNUM_CP2105:
1922                 result = cp2105_gpioconf_init(serial);
1923                 break;
1924         case CP210X_PARTNUM_CP2108:
1925                 /*
1926                  * The GPIOs are not tied to any specific port so only register
1927                  * once for interface 0.
1928                  */
1929                 if (cp210x_interface_num(serial) != 0)
1930                         return 0;
1931                 result = cp2108_gpio_init(serial);
1932                 break;
1933         case CP210X_PARTNUM_CP2102N_QFN28:
1934         case CP210X_PARTNUM_CP2102N_QFN24:
1935         case CP210X_PARTNUM_CP2102N_QFN20:
1936                 result = cp2102n_gpioconf_init(serial);
1937                 break;
1938         default:
1939                 return 0;
1940         }
1941
1942         if (result < 0)
1943                 return result;
1944
1945         priv->gc.label = "cp210x";
1946         priv->gc.get_direction = cp210x_gpio_direction_get;
1947         priv->gc.direction_input = cp210x_gpio_direction_input;
1948         priv->gc.direction_output = cp210x_gpio_direction_output;
1949         priv->gc.get = cp210x_gpio_get;
1950         priv->gc.set = cp210x_gpio_set;
1951         priv->gc.set_config = cp210x_gpio_set_config;
1952         priv->gc.init_valid_mask = cp210x_gpio_init_valid_mask;
1953         priv->gc.owner = THIS_MODULE;
1954         priv->gc.parent = &serial->interface->dev;
1955         priv->gc.base = -1;
1956         priv->gc.can_sleep = true;
1957
1958         result = gpiochip_add_data(&priv->gc, serial);
1959         if (!result)
1960                 priv->gpio_registered = true;
1961
1962         return result;
1963 }
1964
1965 static void cp210x_gpio_remove(struct usb_serial *serial)
1966 {
1967         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1968
1969         if (priv->gpio_registered) {
1970                 gpiochip_remove(&priv->gc);
1971                 priv->gpio_registered = false;
1972         }
1973 }
1974
1975 #else
1976
1977 static int cp210x_gpio_init(struct usb_serial *serial)
1978 {
1979         return 0;
1980 }
1981
1982 static void cp210x_gpio_remove(struct usb_serial *serial)
1983 {
1984         /* Nothing to do */
1985 }
1986
1987 #endif
1988
1989 static int cp210x_port_probe(struct usb_serial_port *port)
1990 {
1991         struct usb_serial *serial = port->serial;
1992         struct cp210x_port_private *port_priv;
1993
1994         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1995         if (!port_priv)
1996                 return -ENOMEM;
1997
1998         port_priv->bInterfaceNumber = cp210x_interface_num(serial);
1999         mutex_init(&port_priv->mutex);
2000
2001         usb_set_serial_port_data(port, port_priv);
2002
2003         return 0;
2004 }
2005
2006 static void cp210x_port_remove(struct usb_serial_port *port)
2007 {
2008         struct cp210x_port_private *port_priv;
2009
2010         port_priv = usb_get_serial_port_data(port);
2011         kfree(port_priv);
2012 }
2013
2014 static void cp210x_init_max_speed(struct usb_serial *serial)
2015 {
2016         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2017         bool use_actual_rate = false;
2018         speed_t min = 300;
2019         speed_t max;
2020
2021         switch (priv->partnum) {
2022         case CP210X_PARTNUM_CP2101:
2023                 max = 921600;
2024                 break;
2025         case CP210X_PARTNUM_CP2102:
2026         case CP210X_PARTNUM_CP2103:
2027                 max = 1000000;
2028                 break;
2029         case CP210X_PARTNUM_CP2104:
2030                 use_actual_rate = true;
2031                 max = 2000000;
2032                 break;
2033         case CP210X_PARTNUM_CP2108:
2034                 max = 2000000;
2035                 break;
2036         case CP210X_PARTNUM_CP2105:
2037                 if (cp210x_interface_num(serial) == 0) {
2038                         use_actual_rate = true;
2039                         max = 2000000;  /* ECI */
2040                 } else {
2041                         min = 2400;
2042                         max = 921600;   /* SCI */
2043                 }
2044                 break;
2045         case CP210X_PARTNUM_CP2102N_QFN28:
2046         case CP210X_PARTNUM_CP2102N_QFN24:
2047         case CP210X_PARTNUM_CP2102N_QFN20:
2048                 use_actual_rate = true;
2049                 max = 3000000;
2050                 break;
2051         default:
2052                 max = 2000000;
2053                 break;
2054         }
2055
2056         priv->min_speed = min;
2057         priv->max_speed = max;
2058         priv->use_actual_rate = use_actual_rate;
2059 }
2060
2061 static void cp2102_determine_quirks(struct usb_serial *serial)
2062 {
2063         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2064         u8 *buf;
2065         int ret;
2066
2067         buf = kmalloc(2, GFP_KERNEL);
2068         if (!buf)
2069                 return;
2070         /*
2071          * Some (possibly counterfeit) CP2102 do not support event-insertion
2072          * mode and respond differently to malformed vendor requests.
2073          * Specifically, they return one instead of two bytes when sent a
2074          * two-byte part-number request.
2075          */
2076         ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2077                         CP210X_VENDOR_SPECIFIC, REQTYPE_DEVICE_TO_HOST,
2078                         CP210X_GET_PARTNUM, 0, buf, 2, USB_CTRL_GET_TIMEOUT);
2079         if (ret == 1) {
2080                 dev_dbg(&serial->interface->dev,
2081                                 "device does not support event-insertion mode\n");
2082                 priv->no_event_mode = true;
2083         }
2084
2085         kfree(buf);
2086 }
2087
2088 static int cp210x_get_fw_version(struct usb_serial *serial, u16 value)
2089 {
2090         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2091         u8 ver[3];
2092         int ret;
2093
2094         ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, value,
2095                         ver, sizeof(ver));
2096         if (ret)
2097                 return ret;
2098
2099         dev_dbg(&serial->interface->dev, "%s - %d.%d.%d\n", __func__,
2100                         ver[0], ver[1], ver[2]);
2101
2102         priv->fw_version = ver[0] << 16 | ver[1] << 8 | ver[2];
2103
2104         return 0;
2105 }
2106
2107 static void cp210x_determine_type(struct usb_serial *serial)
2108 {
2109         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2110         int ret;
2111
2112         ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
2113                         CP210X_GET_PARTNUM, &priv->partnum,
2114                         sizeof(priv->partnum));
2115         if (ret < 0) {
2116                 dev_warn(&serial->interface->dev,
2117                                 "querying part number failed\n");
2118                 priv->partnum = CP210X_PARTNUM_UNKNOWN;
2119                 return;
2120         }
2121
2122         dev_dbg(&serial->interface->dev, "partnum = 0x%02x\n", priv->partnum);
2123
2124         switch (priv->partnum) {
2125         case CP210X_PARTNUM_CP2102:
2126                 cp2102_determine_quirks(serial);
2127                 break;
2128         case CP210X_PARTNUM_CP2105:
2129         case CP210X_PARTNUM_CP2108:
2130                 cp210x_get_fw_version(serial, CP210X_GET_FW_VER);
2131                 break;
2132         case CP210X_PARTNUM_CP2102N_QFN28:
2133         case CP210X_PARTNUM_CP2102N_QFN24:
2134         case CP210X_PARTNUM_CP2102N_QFN20:
2135                 ret = cp210x_get_fw_version(serial, CP210X_GET_FW_VER_2N);
2136                 if (ret)
2137                         break;
2138                 if (priv->fw_version <= 0x10004)
2139                         priv->no_flow_control = true;
2140                 break;
2141         default:
2142                 break;
2143         }
2144 }
2145
2146 static int cp210x_attach(struct usb_serial *serial)
2147 {
2148         int result;
2149         struct cp210x_serial_private *priv;
2150
2151         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2152         if (!priv)
2153                 return -ENOMEM;
2154
2155         usb_set_serial_data(serial, priv);
2156
2157         cp210x_determine_type(serial);
2158         cp210x_init_max_speed(serial);
2159
2160         result = cp210x_gpio_init(serial);
2161         if (result < 0) {
2162                 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n",
2163                                 result);
2164         }
2165
2166         return 0;
2167 }
2168
2169 static void cp210x_disconnect(struct usb_serial *serial)
2170 {
2171         cp210x_gpio_remove(serial);
2172 }
2173
2174 static void cp210x_release(struct usb_serial *serial)
2175 {
2176         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2177
2178         cp210x_gpio_remove(serial);
2179
2180         kfree(priv);
2181 }
2182
2183 module_usb_serial_driver(serial_drivers, id_table);
2184
2185 MODULE_DESCRIPTION(DRIVER_DESC);
2186 MODULE_LICENSE("GPL v2");