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 int 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, 0x87ED) }, /* IMST USB-Stick for Smart Meter */
 150         { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
 151         { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
 152         { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
 153         { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
 154         { USB_DEVICE(0x10C4, 0x88D8) }, /* Acuity Brands nLight Air Adapter */
 155         { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */
 156         { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */
 157         { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
 158         { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
 159         { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
 160         { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
 161         { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */
 162         { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */
 163         { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
 164         { USB_DEVICE(0x10C4, 0x8A5B) }, /* CEL EM3588 ZigBee USB Stick */
 165         { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
 166         { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
 167         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 168         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 169         { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */
 170         { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
 171         { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
 172         { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */
 173         { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */
 174         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 175         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 176         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 177         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 178         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 179         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 180         { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
 181         { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
 182         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 183         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 184         { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */
 185         { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
 186         { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
 187         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 188         { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
 189         { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
 190         { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
 191         { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
 192         { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
 193         { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
 194         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 195         { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
 196         { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
 197         { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
 198         { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
 199         { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
 200         { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
 201         { USB_DEVICE(0x17A8, 0x0011) }, /* Kamstrup 444 MHz RF sniffer */
 202         { USB_DEVICE(0x17A8, 0x0013) }, /* Kamstrup 870 MHz RF sniffer */
 203         { USB_DEVICE(0x17A8, 0x0101) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Int Ant) */
 204         { USB_DEVICE(0x17A8, 0x0102) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Ext Ant) */
 205         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
 206         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
 207         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 208         { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
 209         { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
 210         { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
 211         { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
 212         { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
 213         { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
 214         { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
 215         { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
 216         { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 M.2 Key E serial interface */
 217         { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 Display serial interface */
 218         { USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */
 219         { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
 220         { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
 221         { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
 222         { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
 223         { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
 224         { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
 225         { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
 226         { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
 227         { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
 228         { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
 229         { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
 230         { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
 231         { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
 232         { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
 233         { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
 234         { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
 235         { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
 236         { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
 237         { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
 238         { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
 239         { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
 240         { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
 241         { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
 242         { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
 243         { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
 244         { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
 245         { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
 246         { USB_DEVICE(0x2184, 0x0030) }, /* GW Instek GDM-834x Digital Multimeter */
 247         { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
 248         { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
 249         { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
 250         { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
 251         { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
 252         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 253         { } /* Terminating Entry */
 254 };
 255
 256 MODULE_DEVICE_TABLE(usb, id_table);
 257
 258 struct cp210x_serial_private {
 259 #ifdef CONFIG_GPIOLIB
 260         struct gpio_chip        gc;
 261         bool                    gpio_registered;
 262         u16                     gpio_pushpull;
 263         u16                     gpio_altfunc;
 264         u16                     gpio_input;
 265 #endif
 266         u8                      partnum;
 267         u32                     fw_version;
 268         speed_t                 min_speed;
 269         speed_t                 max_speed;
 270         bool                    use_actual_rate;
 271         bool                    no_flow_control;
 272         bool                    no_event_mode;
 273 };
 274
 275 enum cp210x_event_state {
 276         ES_DATA,
 277         ES_ESCAPE,
 278         ES_LSR,
 279         ES_LSR_DATA_0,
 280         ES_LSR_DATA_1,
 281         ES_MSR
 282 };
 283
 284 struct cp210x_port_private {
 285         u8                      bInterfaceNumber;
 286         bool                    event_mode;
 287         enum cp210x_event_state event_state;
 288         u8                      lsr;
 289
 290         struct mutex            mutex;
 291         bool                    crtscts;
 292         bool                    dtr;
 293         bool                    rts;
 294 };
 295
 296 static struct usb_serial_driver cp210x_device = {
 297         .driver = {
 298                 .owner =        THIS_MODULE,
 299                 .name =         "cp210x",
 300         },
 301         .id_table               = id_table,
 302         .num_ports              = 1,
 303         .bulk_in_size           = 256,
 304         .bulk_out_size          = 256,
 305         .open                   = cp210x_open,
 306         .close                  = cp210x_close,
 307         .break_ctl              = cp210x_break_ctl,
 308         .set_termios            = cp210x_set_termios,
 309         .tx_empty               = cp210x_tx_empty,
 310         .throttle               = usb_serial_generic_throttle,
 311         .unthrottle             = usb_serial_generic_unthrottle,
 312         .tiocmget               = cp210x_tiocmget,
 313         .tiocmset               = cp210x_tiocmset,
 314         .get_icount             = usb_serial_generic_get_icount,
 315         .attach                 = cp210x_attach,
 316         .disconnect             = cp210x_disconnect,
 317         .release                = cp210x_release,
 318         .port_probe             = cp210x_port_probe,
 319         .port_remove            = cp210x_port_remove,
 320         .dtr_rts                = cp210x_dtr_rts,
 321         .process_read_urb       = cp210x_process_read_urb,
 322 };
 323
 324 static struct usb_serial_driver * const serial_drivers[] = {
 325         &cp210x_device, NULL
 326 };
 327
 328 /* Config request types */
 329 #define REQTYPE_HOST_TO_INTERFACE       0x41
 330 #define REQTYPE_INTERFACE_TO_HOST       0xc1
 331 #define REQTYPE_HOST_TO_DEVICE  0x40
 332 #define REQTYPE_DEVICE_TO_HOST  0xc0
 333
 334 /* Config request codes */
 335 #define CP210X_IFC_ENABLE       0x00
 336 #define CP210X_SET_BAUDDIV      0x01
 337 #define CP210X_GET_BAUDDIV      0x02
 338 #define CP210X_SET_LINE_CTL     0x03
 339 #define CP210X_GET_LINE_CTL     0x04
 340 #define CP210X_SET_BREAK        0x05
 341 #define CP210X_IMM_CHAR         0x06
 342 #define CP210X_SET_MHS          0x07
 343 #define CP210X_GET_MDMSTS       0x08
 344 #define CP210X_SET_XON          0x09
 345 #define CP210X_SET_XOFF         0x0A
 346 #define CP210X_SET_EVENTMASK    0x0B
 347 #define CP210X_GET_EVENTMASK    0x0C
 348 #define CP210X_SET_CHAR         0x0D
 349 #define CP210X_GET_CHARS        0x0E
 350 #define CP210X_GET_PROPS        0x0F
 351 #define CP210X_GET_COMM_STATUS  0x10
 352 #define CP210X_RESET            0x11
 353 #define CP210X_PURGE            0x12
 354 #define CP210X_SET_FLOW         0x13
 355 #define CP210X_GET_FLOW         0x14
 356 #define CP210X_EMBED_EVENTS     0x15
 357 #define CP210X_GET_EVENTSTATE   0x16
 358 #define CP210X_SET_CHARS        0x19
 359 #define CP210X_GET_BAUDRATE     0x1D
 360 #define CP210X_SET_BAUDRATE     0x1E
 361 #define CP210X_VENDOR_SPECIFIC  0xFF
 362
 363 /* CP210X_IFC_ENABLE */
 364 #define UART_ENABLE             0x0001
 365 #define UART_DISABLE            0x0000
 366
 367 /* CP210X_(SET|GET)_BAUDDIV */
 368 #define BAUD_RATE_GEN_FREQ      0x384000
 369
 370 /* CP210X_(SET|GET)_LINE_CTL */
 371 #define BITS_DATA_MASK          0X0f00
 372 #define BITS_DATA_5             0X0500
 373 #define BITS_DATA_6             0X0600
 374 #define BITS_DATA_7             0X0700
 375 #define BITS_DATA_8             0X0800
 376 #define BITS_DATA_9             0X0900
 377
 378 #define BITS_PARITY_MASK        0x00f0
 379 #define BITS_PARITY_NONE        0x0000
 380 #define BITS_PARITY_ODD         0x0010
 381 #define BITS_PARITY_EVEN        0x0020
 382 #define BITS_PARITY_MARK        0x0030
 383 #define BITS_PARITY_SPACE       0x0040
 384
 385 #define BITS_STOP_MASK          0x000f
 386 #define BITS_STOP_1             0x0000
 387 #define BITS_STOP_1_5           0x0001
 388 #define BITS_STOP_2             0x0002
 389
 390 /* CP210X_SET_BREAK */
 391 #define BREAK_ON                0x0001
 392 #define BREAK_OFF               0x0000
 393
 394 /* CP210X_(SET_MHS|GET_MDMSTS) */
 395 #define CONTROL_DTR             0x0001
 396 #define CONTROL_RTS             0x0002
 397 #define CONTROL_CTS             0x0010
 398 #define CONTROL_DSR             0x0020
 399 #define CONTROL_RING            0x0040
 400 #define CONTROL_DCD             0x0080
 401 #define CONTROL_WRITE_DTR       0x0100
 402 #define CONTROL_WRITE_RTS       0x0200
 403
 404 /* CP210X_(GET|SET)_CHARS */
 405 struct cp210x_special_chars {
 406         u8      bEofChar;
 407         u8      bErrorChar;
 408         u8      bBreakChar;
 409         u8      bEventChar;
 410         u8      bXonChar;
 411         u8      bXoffChar;
 412 };
 413
 414 /* CP210X_VENDOR_SPECIFIC values */
 415 #define CP210X_GET_FW_VER       0x000E
 416 #define CP210X_READ_2NCONFIG    0x000E
 417 #define CP210X_GET_FW_VER_2N    0x0010
 418 #define CP210X_READ_LATCH       0x00C2
 419 #define CP210X_GET_PARTNUM      0x370B
 420 #define CP210X_GET_PORTCONFIG   0x370C
 421 #define CP210X_GET_DEVICEMODE   0x3711
 422 #define CP210X_WRITE_LATCH      0x37E1
 423
 424 /* Part number definitions */
 425 #define CP210X_PARTNUM_CP2101   0x01
 426 #define CP210X_PARTNUM_CP2102   0x02
 427 #define CP210X_PARTNUM_CP2103   0x03
 428 #define CP210X_PARTNUM_CP2104   0x04
 429 #define CP210X_PARTNUM_CP2105   0x05
 430 #define CP210X_PARTNUM_CP2108   0x08
 431 #define CP210X_PARTNUM_CP2102N_QFN28    0x20
 432 #define CP210X_PARTNUM_CP2102N_QFN24    0x21
 433 #define CP210X_PARTNUM_CP2102N_QFN20    0x22
 434 #define CP210X_PARTNUM_UNKNOWN  0xFF
 435
 436 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
 437 struct cp210x_comm_status {
 438         __le32   ulErrors;
 439         __le32   ulHoldReasons;
 440         __le32   ulAmountInInQueue;
 441         __le32   ulAmountInOutQueue;
 442         u8       bEofReceived;
 443         u8       bWaitForImmediate;
 444         u8       bReserved;
 445 } __packed;
 446
 447 /*
 448  * CP210X_PURGE - 16 bits passed in wValue of USB request.
 449  * SiLabs app note AN571 gives a strange description of the 4 bits:
 450  * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
 451  * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
 452  */
 453 #define PURGE_ALL               0x000f
 454
 455 /* CP210X_EMBED_EVENTS */
 456 #define CP210X_ESCCHAR          0xec
 457
 458 #define CP210X_LSR_OVERRUN      BIT(1)
 459 #define CP210X_LSR_PARITY       BIT(2)
 460 #define CP210X_LSR_FRAME        BIT(3)
 461 #define CP210X_LSR_BREAK        BIT(4)
 462
 463
 464 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
 465 struct cp210x_flow_ctl {
 466         __le32  ulControlHandshake;
 467         __le32  ulFlowReplace;
 468         __le32  ulXonLimit;
 469         __le32  ulXoffLimit;
 470 };
 471
 472 /* cp210x_flow_ctl::ulControlHandshake */
 473 #define CP210X_SERIAL_DTR_MASK          GENMASK(1, 0)
 474 #define CP210X_SERIAL_DTR_INACTIVE      (0 << 0)
 475 #define CP210X_SERIAL_DTR_ACTIVE        (1 << 0)
 476 #define CP210X_SERIAL_DTR_FLOW_CTL      (2 << 0)
 477 #define CP210X_SERIAL_CTS_HANDSHAKE     BIT(3)
 478 #define CP210X_SERIAL_DSR_HANDSHAKE     BIT(4)
 479 #define CP210X_SERIAL_DCD_HANDSHAKE     BIT(5)
 480 #define CP210X_SERIAL_DSR_SENSITIVITY   BIT(6)
 481
 482 /* cp210x_flow_ctl::ulFlowReplace */
 483 #define CP210X_SERIAL_AUTO_TRANSMIT     BIT(0)
 484 #define CP210X_SERIAL_AUTO_RECEIVE      BIT(1)
 485 #define CP210X_SERIAL_ERROR_CHAR        BIT(2)
 486 #define CP210X_SERIAL_NULL_STRIPPING    BIT(3)
 487 #define CP210X_SERIAL_BREAK_CHAR        BIT(4)
 488 #define CP210X_SERIAL_RTS_MASK          GENMASK(7, 6)
 489 #define CP210X_SERIAL_RTS_INACTIVE      (0 << 6)
 490 #define CP210X_SERIAL_RTS_ACTIVE        (1 << 6)
 491 #define CP210X_SERIAL_RTS_FLOW_CTL      (2 << 6)
 492 #define CP210X_SERIAL_XOFF_CONTINUE     BIT(31)
 493
 494 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
 495 struct cp210x_pin_mode {
 496         u8      eci;
 497         u8      sci;
 498 };
 499
 500 #define CP210X_PIN_MODE_MODEM           0
 501 #define CP210X_PIN_MODE_GPIO            BIT(0)
 502
 503 /*
 504  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes
 505  * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes.
 506  */
 507 struct cp210x_dual_port_config {
 508         __le16  gpio_mode;
 509         u8      __pad0[2];
 510         __le16  reset_state;
 511         u8      __pad1[4];
 512         __le16  suspend_state;
 513         u8      sci_cfg;
 514         u8      eci_cfg;
 515         u8      device_cfg;
 516 } __packed;
 517
 518 /*
 519  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes
 520  * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes.
 521  */
 522 struct cp210x_single_port_config {
 523         __le16  gpio_mode;
 524         u8      __pad0[2];
 525         __le16  reset_state;
 526         u8      __pad1[4];
 527         __le16  suspend_state;
 528         u8      device_cfg;
 529 } __packed;
 530
 531 /* GPIO modes */
 532 #define CP210X_SCI_GPIO_MODE_OFFSET     9
 533 #define CP210X_SCI_GPIO_MODE_MASK       GENMASK(11, 9)
 534
 535 #define CP210X_ECI_GPIO_MODE_OFFSET     2
 536 #define CP210X_ECI_GPIO_MODE_MASK       GENMASK(3, 2)
 537
 538 #define CP210X_GPIO_MODE_OFFSET         8
 539 #define CP210X_GPIO_MODE_MASK           GENMASK(11, 8)
 540
 541 /* CP2105 port configuration values */
 542 #define CP2105_GPIO0_TXLED_MODE         BIT(0)
 543 #define CP2105_GPIO1_RXLED_MODE         BIT(1)
 544 #define CP2105_GPIO1_RS485_MODE         BIT(2)
 545
 546 /* CP2104 port configuration values */
 547 #define CP2104_GPIO0_TXLED_MODE         BIT(0)
 548 #define CP2104_GPIO1_RXLED_MODE         BIT(1)
 549 #define CP2104_GPIO2_RS485_MODE         BIT(2)
 550
 551 struct cp210x_quad_port_state {
 552         __le16 gpio_mode_pb0;
 553         __le16 gpio_mode_pb1;
 554         __le16 gpio_mode_pb2;
 555         __le16 gpio_mode_pb3;
 556         __le16 gpio_mode_pb4;
 557
 558         __le16 gpio_lowpower_pb0;
 559         __le16 gpio_lowpower_pb1;
 560         __le16 gpio_lowpower_pb2;
 561         __le16 gpio_lowpower_pb3;
 562         __le16 gpio_lowpower_pb4;
 563
 564         __le16 gpio_latch_pb0;
 565         __le16 gpio_latch_pb1;
 566         __le16 gpio_latch_pb2;
 567         __le16 gpio_latch_pb3;
 568         __le16 gpio_latch_pb4;
 569 };
 570
 571 /*
 572  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0x49 bytes
 573  * on a CP2108 chip.
 574  *
 575  * See https://www.silabs.com/documents/public/application-notes/an978-cp210x-usb-to-uart-api-specification.pdf
 576  */
 577 struct cp210x_quad_port_config {
 578         struct cp210x_quad_port_state reset_state;
 579         struct cp210x_quad_port_state suspend_state;
 580         u8 ipdelay_ifc[4];
 581         u8 enhancedfxn_ifc[4];
 582         u8 enhancedfxn_device;
 583         u8 extclkfreq[4];
 584 } __packed;
 585
 586 #define CP2108_EF_IFC_GPIO_TXLED                0x01
 587 #define CP2108_EF_IFC_GPIO_RXLED                0x02
 588 #define CP2108_EF_IFC_GPIO_RS485                0x04
 589 #define CP2108_EF_IFC_GPIO_RS485_LOGIC          0x08
 590 #define CP2108_EF_IFC_GPIO_CLOCK                0x10
 591 #define CP2108_EF_IFC_DYNAMIC_SUSPEND           0x40
 592
 593 /* CP2102N configuration array indices */
 594 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX      2
 595 #define CP210X_2NCONFIG_GPIO_MODE_IDX           581
 596 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX       587
 597 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX        600
 598
 599 /* CP2102N QFN20 port configuration values */
 600 #define CP2102N_QFN20_GPIO2_TXLED_MODE          BIT(2)
 601 #define CP2102N_QFN20_GPIO3_RXLED_MODE          BIT(3)
 602 #define CP2102N_QFN20_GPIO1_RS485_MODE          BIT(4)
 603 #define CP2102N_QFN20_GPIO0_CLK_MODE            BIT(6)
 604
 605 /*
 606  * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x02 bytes
 607  * for CP2102N, CP2103, CP2104 and CP2105.
 608  */
 609 struct cp210x_gpio_write {
 610         u8      mask;
 611         u8      state;
 612 };
 613
 614 /*
 615  * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x04 bytes
 616  * for CP2108.
 617  */
 618 struct cp210x_gpio_write16 {
 619         __le16  mask;
 620         __le16  state;
 621 };
 622
 623 /*
 624  * Helper to get interface number when we only have struct usb_serial.
 625  */
 626 static u8 cp210x_interface_num(struct usb_serial *serial)
 627 {
 628         struct usb_host_interface *cur_altsetting;
 629
 630         cur_altsetting = serial->interface->cur_altsetting;
 631
 632         return cur_altsetting->desc.bInterfaceNumber;
 633 }
 634
 635 /*
 636  * Reads a variable-sized block of CP210X_ registers, identified by req.
 637  * Returns data into buf in native USB byte order.
 638  */
 639 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
 640                 void *buf, int bufsize)
 641 {
 642         struct usb_serial *serial = port->serial;
 643         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 644         int result;
 645
 646
 647         result = usb_control_msg_recv(serial->dev, 0, req,
 648                         REQTYPE_INTERFACE_TO_HOST, 0,
 649                         port_priv->bInterfaceNumber, buf, bufsize,
 650                         USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
 651         if (result) {
 652                 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
 653                                 req, bufsize, result);
 654                 return result;
 655         }
 656
 657         return 0;
 658 }
 659
 660 /*
 661  * Reads any 8-bit CP210X_ register identified by req.
 662  */
 663 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
 664 {
 665         return cp210x_read_reg_block(port, req, val, sizeof(*val));
 666 }
 667
 668 /*
 669  * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
 670  * Returns data into buf in native USB byte order.
 671  */
 672 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
 673                                     void *buf, int bufsize)
 674 {
 675         int result;
 676
 677         result = usb_control_msg_recv(serial->dev, 0, CP210X_VENDOR_SPECIFIC,
 678                         type, val, cp210x_interface_num(serial), buf, bufsize,
 679                         USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
 680         if (result) {
 681                 dev_err(&serial->interface->dev,
 682                         "failed to get vendor val 0x%04x size %d: %d\n", val,
 683                         bufsize, result);
 684                 return result;
 685         }
 686
 687         return 0;
 688 }
 689
 690 /*
 691  * Writes any 16-bit CP210X_ register (req) whose value is passed
 692  * entirely in the wValue field of the USB request.
 693  */
 694 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
 695 {
 696         struct usb_serial *serial = port->serial;
 697         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 698         int result;
 699
 700         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 701                         req, REQTYPE_HOST_TO_INTERFACE, val,
 702                         port_priv->bInterfaceNumber, NULL, 0,
 703                         USB_CTRL_SET_TIMEOUT);
 704         if (result < 0) {
 705                 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
 706                                 req, result);
 707         }
 708
 709         return result;
 710 }
 711
 712 /*
 713  * Writes a variable-sized block of CP210X_ registers, identified by req.
 714  * Data in buf must be in native USB byte order.
 715  */
 716 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
 717                 void *buf, int bufsize)
 718 {
 719         struct usb_serial *serial = port->serial;
 720         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 721         int result;
 722
 723         result = usb_control_msg_send(serial->dev, 0, req,
 724                         REQTYPE_HOST_TO_INTERFACE, 0,
 725                         port_priv->bInterfaceNumber, buf, bufsize,
 726                         USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
 727         if (result) {
 728                 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
 729                                 req, bufsize, result);
 730                 return result;
 731         }
 732
 733         return 0;
 734 }
 735
 736 /*
 737  * Writes any 32-bit CP210X_ register identified by req.
 738  */
 739 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
 740 {
 741         __le32 le32_val;
 742
 743         le32_val = cpu_to_le32(val);
 744
 745         return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
 746 }
 747
 748 #ifdef CONFIG_GPIOLIB
 749 /*
 750  * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
 751  * Data in buf must be in native USB byte order.
 752  */
 753 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
 754                                      u16 val, void *buf, int bufsize)
 755 {
 756         int result;
 757
 758         result = usb_control_msg_send(serial->dev, 0, CP210X_VENDOR_SPECIFIC,
 759                         type, val, cp210x_interface_num(serial), buf, bufsize,
 760                         USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
 761         if (result) {
 762                 dev_err(&serial->interface->dev,
 763                         "failed to set vendor val 0x%04x size %d: %d\n", val,
 764                         bufsize, result);
 765                 return result;
 766         }
 767
 768         return 0;
 769 }
 770 #endif
 771
 772 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 773 {
 774         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 775         int result;
 776
 777         result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
 778         if (result) {
 779                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
 780                 return result;
 781         }
 782
 783         if (tty)
 784                 cp210x_set_termios(tty, port, NULL);
 785
 786         result = usb_serial_generic_open(tty, port);
 787         if (result)
 788                 goto err_disable;
 789
 790         return 0;
 791
 792 err_disable:
 793         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 794         port_priv->event_mode = false;
 795
 796         return result;
 797 }
 798
 799 static void cp210x_close(struct usb_serial_port *port)
 800 {
 801         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 802
 803         usb_serial_generic_close(port);
 804
 805         /* Clear both queues; cp2108 needs this to avoid an occasional hang */
 806         cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
 807
 808         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 809
 810         /* Disabling the interface disables event-insertion mode. */
 811         port_priv->event_mode = false;
 812 }
 813
 814 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag)
 815 {
 816         if (lsr & CP210X_LSR_BREAK) {
 817                 port->icount.brk++;
 818                 *flag = TTY_BREAK;
 819         } else if (lsr & CP210X_LSR_PARITY) {
 820                 port->icount.parity++;
 821                 *flag = TTY_PARITY;
 822         } else if (lsr & CP210X_LSR_FRAME) {
 823                 port->icount.frame++;
 824                 *flag = TTY_FRAME;
 825         }
 826
 827         if (lsr & CP210X_LSR_OVERRUN) {
 828                 port->icount.overrun++;
 829                 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
 830         }
 831 }
 832
 833 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag)
 834 {
 835         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 836
 837         switch (port_priv->event_state) {
 838         case ES_DATA:
 839                 if (*ch == CP210X_ESCCHAR) {
 840                         port_priv->event_state = ES_ESCAPE;
 841                         break;
 842                 }
 843                 return false;
 844         case ES_ESCAPE:
 845                 switch (*ch) {
 846                 case 0:
 847                         dev_dbg(&port->dev, "%s - escape char\n", __func__);
 848                         *ch = CP210X_ESCCHAR;
 849                         port_priv->event_state = ES_DATA;
 850                         return false;
 851                 case 1:
 852                         port_priv->event_state = ES_LSR_DATA_0;
 853                         break;
 854                 case 2:
 855                         port_priv->event_state = ES_LSR;
 856                         break;
 857                 case 3:
 858                         port_priv->event_state = ES_MSR;
 859                         break;
 860                 default:
 861                         dev_err(&port->dev, "malformed event 0x%02x\n", *ch);
 862                         port_priv->event_state = ES_DATA;
 863                         break;
 864                 }
 865                 break;
 866         case ES_LSR_DATA_0:
 867                 port_priv->lsr = *ch;
 868                 port_priv->event_state = ES_LSR_DATA_1;
 869                 break;
 870         case ES_LSR_DATA_1:
 871                 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n",
 872                                 __func__, port_priv->lsr, *ch);
 873                 cp210x_process_lsr(port, port_priv->lsr, flag);
 874                 port_priv->event_state = ES_DATA;
 875                 return false;
 876         case ES_LSR:
 877                 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch);
 878                 port_priv->lsr = *ch;
 879                 cp210x_process_lsr(port, port_priv->lsr, flag);
 880                 port_priv->event_state = ES_DATA;
 881                 break;
 882         case ES_MSR:
 883                 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch);
 884                 /* unimplemented */
 885                 port_priv->event_state = ES_DATA;
 886                 break;
 887         }
 888
 889         return true;
 890 }
 891
 892 static void cp210x_process_read_urb(struct urb *urb)
 893 {
 894         struct usb_serial_port *port = urb->context;
 895         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 896         unsigned char *ch = urb->transfer_buffer;
 897         char flag;
 898         int i;
 899
 900         if (!urb->actual_length)
 901                 return;
 902
 903         if (port_priv->event_mode) {
 904                 for (i = 0; i < urb->actual_length; i++, ch++) {
 905                         flag = TTY_NORMAL;
 906
 907                         if (cp210x_process_char(port, ch, &flag))
 908                                 continue;
 909
 910                         tty_insert_flip_char(&port->port, *ch, flag);
 911                 }
 912         } else {
 913                 tty_insert_flip_string(&port->port, ch, urb->actual_length);
 914         }
 915         tty_flip_buffer_push(&port->port);
 916 }
 917
 918 /*
 919  * Read how many bytes are waiting in the TX queue.
 920  */
 921 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
 922                 u32 *count)
 923 {
 924         struct usb_serial *serial = port->serial;
 925         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 926         struct cp210x_comm_status sts;
 927         int result;
 928
 929         result = usb_control_msg_recv(serial->dev, 0, CP210X_GET_COMM_STATUS,
 930                         REQTYPE_INTERFACE_TO_HOST, 0,
 931                         port_priv->bInterfaceNumber, &sts, sizeof(sts),
 932                         USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
 933         if (result) {
 934                 dev_err(&port->dev, "failed to get comm status: %d\n", result);
 935                 return result;
 936         }
 937
 938         *count = le32_to_cpu(sts.ulAmountInOutQueue);
 939
 940         return 0;
 941 }
 942
 943 static bool cp210x_tx_empty(struct usb_serial_port *port)
 944 {
 945         int err;
 946         u32 count;
 947
 948         err = cp210x_get_tx_queue_byte_count(port, &count);
 949         if (err)
 950                 return true;
 951
 952         return !count;
 953 }
 954
 955 struct cp210x_rate {
 956         speed_t rate;
 957         speed_t high;
 958 };
 959
 960 static const struct cp210x_rate cp210x_an205_table1[] = {
 961         { 300, 300 },
 962         { 600, 600 },
 963         { 1200, 1200 },
 964         { 1800, 1800 },
 965         { 2400, 2400 },
 966         { 4000, 4000 },
 967         { 4800, 4803 },
 968         { 7200, 7207 },
 969         { 9600, 9612 },
 970         { 14400, 14428 },
 971         { 16000, 16062 },
 972         { 19200, 19250 },
 973         { 28800, 28912 },
 974         { 38400, 38601 },
 975         { 51200, 51558 },
 976         { 56000, 56280 },
 977         { 57600, 58053 },
 978         { 64000, 64111 },
 979         { 76800, 77608 },
 980         { 115200, 117028 },
 981         { 128000, 129347 },
 982         { 153600, 156868 },
 983         { 230400, 237832 },
 984         { 250000, 254234 },
 985         { 256000, 273066 },
 986         { 460800, 491520 },
 987         { 500000, 567138 },
 988         { 576000, 670254 },
 989         { 921600, UINT_MAX }
 990 };
 991
 992 /*
 993  * Quantises the baud rate as per AN205 Table 1
 994  */
 995 static speed_t cp210x_get_an205_rate(speed_t baud)
 996 {
 997         int i;
 998
 999         for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) {
1000                 if (baud <= cp210x_an205_table1[i].high)
1001                         break;
1002         }
1003
1004         return cp210x_an205_table1[i].rate;
1005 }
1006
1007 static speed_t cp210x_get_actual_rate(speed_t baud)
1008 {
1009         unsigned int prescale = 1;
1010         unsigned int div;
1011
1012         if (baud <= 365)
1013                 prescale = 4;
1014
1015         div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud);
1016         baud = 48000000 / (2 * prescale * div);
1017
1018         return baud;
1019 }
1020
1021 /*
1022  * CP2101 supports the following baud rates:
1023  *
1024  *      300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1025  *      38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1026  *
1027  * CP2102 and CP2103 support the following additional rates:
1028  *
1029  *      4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1030  *      576000
1031  *
1032  * The device will map a requested rate to a supported one, but the result
1033  * of requests for rates greater than 1053257 is undefined (see AN205).
1034  *
1035  * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1036  * respectively, with an error less than 1%. The actual rates are determined
1037  * by
1038  *
1039  *      div = round(freq / (2 x prescale x request))
1040  *      actual = freq / (2 x prescale x div)
1041  *
1042  * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1043  * or 1 otherwise.
1044  * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1045  * otherwise.
1046  */
1047 static void cp210x_change_speed(struct tty_struct *tty,
1048                                 struct usb_serial_port *port,
1049                                 const struct ktermios *old_termios)
1050 {
1051         struct usb_serial *serial = port->serial;
1052         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1053         u32 baud;
1054
1055         if (tty->termios.c_ospeed == 0)
1056                 return;
1057
1058         /*
1059          * This maps the requested rate to the actual rate, a valid rate on
1060          * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed].
1061          */
1062         baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed);
1063
1064         if (priv->use_actual_rate)
1065                 baud = cp210x_get_actual_rate(baud);
1066         else if (baud < 1000000)
1067                 baud = cp210x_get_an205_rate(baud);
1068
1069         dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1070         if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1071                 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1072                 if (old_termios)
1073                         baud = old_termios->c_ospeed;
1074                 else
1075                         baud = 9600;
1076         }
1077
1078         tty_encode_baud_rate(tty, baud, baud);
1079 }
1080
1081 static void cp210x_enable_event_mode(struct usb_serial_port *port)
1082 {
1083         struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1084         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1085         int ret;
1086
1087         if (port_priv->event_mode)
1088                 return;
1089
1090         if (priv->no_event_mode)
1091                 return;
1092
1093         port_priv->event_state = ES_DATA;
1094         port_priv->event_mode = true;
1095
1096         ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR);
1097         if (ret) {
1098                 dev_err(&port->dev, "failed to enable events: %d\n", ret);
1099                 port_priv->event_mode = false;
1100         }
1101 }
1102
1103 static void cp210x_disable_event_mode(struct usb_serial_port *port)
1104 {
1105         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1106         int ret;
1107
1108         if (!port_priv->event_mode)
1109                 return;
1110
1111         ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0);
1112         if (ret) {
1113                 dev_err(&port->dev, "failed to disable events: %d\n", ret);
1114                 return;
1115         }
1116
1117         port_priv->event_mode = false;
1118 }
1119
1120 static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b)
1121 {
1122         bool iflag_change, cc_change;
1123
1124         iflag_change = ((a->c_iflag ^ b->c_iflag) & (INPCK | IXON | IXOFF));
1125         cc_change = a->c_cc[VSTART] != b->c_cc[VSTART] ||
1126                         a->c_cc[VSTOP] != b->c_cc[VSTOP];
1127
1128         return tty_termios_hw_change(a, b) || iflag_change || cc_change;
1129 }
1130
1131 static void cp210x_set_flow_control(struct tty_struct *tty,
1132                                     struct usb_serial_port *port,
1133                                     const struct ktermios *old_termios)
1134 {
1135         struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1136         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1137         struct cp210x_special_chars chars;
1138         struct cp210x_flow_ctl flow_ctl;
1139         u32 flow_repl;
1140         u32 ctl_hs;
1141         bool crtscts;
1142         int ret;
1143
1144         /*
1145          * Some CP2102N interpret ulXonLimit as ulFlowReplace (erratum
1146          * CP2102N_E104). Report back that flow control is not supported.
1147          */
1148         if (priv->no_flow_control) {
1149                 tty->termios.c_cflag &= ~CRTSCTS;
1150                 tty->termios.c_iflag &= ~(IXON | IXOFF);
1151         }
1152
1153         if (tty->termios.c_ospeed != 0 &&
1154                         old_termios && old_termios->c_ospeed != 0 &&
1155                         C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) &&
1156                         I_IXON(tty) == (old_termios->c_iflag & IXON) &&
1157                         I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) &&
1158                         START_CHAR(tty) == old_termios->c_cc[VSTART] &&
1159                         STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) {
1160                 return;
1161         }
1162
1163         if (I_IXON(tty) || I_IXOFF(tty)) {
1164                 memset(&chars, 0, sizeof(chars));
1165
1166                 chars.bXonChar = START_CHAR(tty);
1167                 chars.bXoffChar = STOP_CHAR(tty);
1168
1169                 ret = cp210x_write_reg_block(port, CP210X_SET_CHARS, &chars,
1170                                 sizeof(chars));
1171                 if (ret) {
1172                         dev_err(&port->dev, "failed to set special chars: %d\n",
1173                                         ret);
1174                 }
1175         }
1176
1177         mutex_lock(&port_priv->mutex);
1178
1179         if (tty->termios.c_ospeed == 0) {
1180                 port_priv->dtr = false;
1181                 port_priv->rts = false;
1182         } else if (old_termios && old_termios->c_ospeed == 0) {
1183                 port_priv->dtr = true;
1184                 port_priv->rts = true;
1185         }
1186
1187         ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1188                         sizeof(flow_ctl));
1189         if (ret)
1190                 goto out_unlock;
1191
1192         ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1193         flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1194
1195         ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1196         ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1197         ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1198         ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1199         if (port_priv->dtr)
1200                 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
1201         else
1202                 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
1203
1204         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1205         if (C_CRTSCTS(tty)) {
1206                 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1207                 if (port_priv->rts)
1208                         flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
1209                 else
1210                         flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1211                 crtscts = true;
1212         } else {
1213                 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1214                 if (port_priv->rts)
1215                         flow_repl |= CP210X_SERIAL_RTS_ACTIVE;
1216                 else
1217                         flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1218                 crtscts = false;
1219         }
1220
1221         if (I_IXOFF(tty)) {
1222                 flow_repl |= CP210X_SERIAL_AUTO_RECEIVE;
1223
1224                 flow_ctl.ulXonLimit = cpu_to_le32(128);
1225                 flow_ctl.ulXoffLimit = cpu_to_le32(128);
1226         } else {
1227                 flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE;
1228         }
1229
1230         if (I_IXON(tty))
1231                 flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT;
1232         else
1233                 flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT;
1234
1235         dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__,
1236                         ctl_hs, flow_repl);
1237
1238         flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1239         flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1240
1241         ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1242                         sizeof(flow_ctl));
1243         if (ret)
1244                 goto out_unlock;
1245
1246         port_priv->crtscts = crtscts;
1247 out_unlock:
1248         mutex_unlock(&port_priv->mutex);
1249 }
1250
1251 static void cp210x_set_termios(struct tty_struct *tty,
1252                                struct usb_serial_port *port,
1253                                const struct ktermios *old_termios)
1254 {
1255         struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1256         u16 bits;
1257         int ret;
1258
1259         if (old_termios && !cp210x_termios_change(&tty->termios, old_termios) &&
1260                         tty->termios.c_ospeed != 0)
1261                 return;
1262
1263         if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed)
1264                 cp210x_change_speed(tty, port, old_termios);
1265
1266         /* CP2101 only supports CS8, 1 stop bit and non-stick parity. */
1267         if (priv->partnum == CP210X_PARTNUM_CP2101) {
1268                 tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR);
1269                 tty->termios.c_cflag |= CS8;
1270         }
1271
1272         bits = 0;
1273
1274         switch (C_CSIZE(tty)) {
1275         case CS5:
1276                 bits |= BITS_DATA_5;
1277                 break;
1278         case CS6:
1279                 bits |= BITS_DATA_6;
1280                 break;
1281         case CS7:
1282                 bits |= BITS_DATA_7;
1283                 break;
1284         case CS8:
1285         default:
1286                 bits |= BITS_DATA_8;
1287                 break;
1288         }
1289
1290         if (C_PARENB(tty)) {
1291                 if (C_CMSPAR(tty)) {
1292                         if (C_PARODD(tty))
1293                                 bits |= BITS_PARITY_MARK;
1294                         else
1295                                 bits |= BITS_PARITY_SPACE;
1296                 } else {
1297                         if (C_PARODD(tty))
1298                                 bits |= BITS_PARITY_ODD;
1299                         else
1300                                 bits |= BITS_PARITY_EVEN;
1301                 }
1302         }
1303
1304         if (C_CSTOPB(tty))
1305                 bits |= BITS_STOP_2;
1306         else
1307                 bits |= BITS_STOP_1;
1308
1309         ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1310         if (ret)
1311                 dev_err(&port->dev, "failed to set line control: %d\n", ret);
1312
1313         cp210x_set_flow_control(tty, port, old_termios);
1314
1315         /*
1316          * Enable event-insertion mode only if input parity checking is
1317          * enabled for now.
1318          */
1319         if (I_INPCK(tty))
1320                 cp210x_enable_event_mode(port);
1321         else
1322                 cp210x_disable_event_mode(port);
1323 }
1324
1325 static int cp210x_tiocmset(struct tty_struct *tty,
1326                 unsigned int set, unsigned int clear)
1327 {
1328         struct usb_serial_port *port = tty->driver_data;
1329         return cp210x_tiocmset_port(port, set, clear);
1330 }
1331
1332 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1333                 unsigned int set, unsigned int clear)
1334 {
1335         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1336         struct cp210x_flow_ctl flow_ctl;
1337         u32 ctl_hs, flow_repl;
1338         u16 control = 0;
1339         int ret;
1340
1341         mutex_lock(&port_priv->mutex);
1342
1343         if (set & TIOCM_RTS) {
1344                 port_priv->rts = true;
1345                 control |= CONTROL_RTS;
1346                 control |= CONTROL_WRITE_RTS;
1347         }
1348         if (set & TIOCM_DTR) {
1349                 port_priv->dtr = true;
1350                 control |= CONTROL_DTR;
1351                 control |= CONTROL_WRITE_DTR;
1352         }
1353         if (clear & TIOCM_RTS) {
1354                 port_priv->rts = false;
1355                 control &= ~CONTROL_RTS;
1356                 control |= CONTROL_WRITE_RTS;
1357         }
1358         if (clear & TIOCM_DTR) {
1359                 port_priv->dtr = false;
1360                 control &= ~CONTROL_DTR;
1361                 control |= CONTROL_WRITE_DTR;
1362         }
1363
1364         /*
1365          * Use SET_FLOW to set DTR and enable/disable auto-RTS when hardware
1366          * flow control is enabled.
1367          */
1368         if (port_priv->crtscts && control & CONTROL_WRITE_RTS) {
1369                 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1370                                 sizeof(flow_ctl));
1371                 if (ret)
1372                         goto out_unlock;
1373
1374                 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1375                 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1376
1377                 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1378                 if (port_priv->dtr)
1379                         ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
1380                 else
1381                         ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
1382
1383                 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1384                 if (port_priv->rts)
1385                         flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
1386                 else
1387                         flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1388
1389                 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1390                 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1391
1392                 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n",
1393                                 __func__, ctl_hs, flow_repl);
1394
1395                 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1396                                 sizeof(flow_ctl));
1397         } else {
1398                 dev_dbg(&port->dev, "%s - control = 0x%04x\n", __func__, control);
1399
1400                 ret = cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1401         }
1402 out_unlock:
1403         mutex_unlock(&port_priv->mutex);
1404
1405         return ret;
1406 }
1407
1408 static void cp210x_dtr_rts(struct usb_serial_port *port, int on)
1409 {
1410         if (on)
1411                 cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0);
1412         else
1413                 cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS);
1414 }
1415
1416 static int cp210x_tiocmget(struct tty_struct *tty)
1417 {
1418         struct usb_serial_port *port = tty->driver_data;
1419         u8 control;
1420         int result;
1421
1422         result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1423         if (result)
1424                 return result;
1425
1426         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1427                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1428                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1429                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1430                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
1431                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
1432
1433         dev_dbg(&port->dev, "%s - control = 0x%02x\n", __func__, control);
1434
1435         return result;
1436 }
1437
1438 static int cp210x_break_ctl(struct tty_struct *tty, int break_state)
1439 {
1440         struct usb_serial_port *port = tty->driver_data;
1441         struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1442         u16 state;
1443
1444         if (priv->partnum == CP210X_PARTNUM_CP2105) {
1445                 if (cp210x_interface_num(port->serial) == 1)
1446                         return -ENOTTY;
1447         }
1448
1449         if (break_state == 0)
1450                 state = BREAK_OFF;
1451         else
1452                 state = BREAK_ON;
1453
1454         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1455                 state == BREAK_OFF ? "off" : "on");
1456
1457         return cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1458 }
1459
1460 #ifdef CONFIG_GPIOLIB
1461 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1462 {
1463         struct usb_serial *serial = gpiochip_get_data(gc);
1464         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1465         u8 req_type;
1466         u16 mask;
1467         int result;
1468         int len;
1469
1470         result = usb_autopm_get_interface(serial->interface);
1471         if (result)
1472                 return result;
1473
1474         switch (priv->partnum) {
1475         case CP210X_PARTNUM_CP2105:
1476                 req_type = REQTYPE_INTERFACE_TO_HOST;
1477                 len = 1;
1478                 break;
1479         case CP210X_PARTNUM_CP2108:
1480                 req_type = REQTYPE_INTERFACE_TO_HOST;
1481                 len = 2;
1482                 break;
1483         default:
1484                 req_type = REQTYPE_DEVICE_TO_HOST;
1485                 len = 1;
1486                 break;
1487         }
1488
1489         mask = 0;
1490         result = cp210x_read_vendor_block(serial, req_type, CP210X_READ_LATCH,
1491                                           &mask, len);
1492
1493         usb_autopm_put_interface(serial->interface);
1494
1495         if (result < 0)
1496                 return result;
1497
1498         le16_to_cpus(&mask);
1499
1500         return !!(mask & BIT(gpio));
1501 }
1502
1503 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1504 {
1505         struct usb_serial *serial = gpiochip_get_data(gc);
1506         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1507         struct cp210x_gpio_write16 buf16;
1508         struct cp210x_gpio_write buf;
1509         u16 mask, state;
1510         u16 wIndex;
1511         int result;
1512
1513         if (value == 1)
1514                 state = BIT(gpio);
1515         else
1516                 state = 0;
1517
1518         mask = BIT(gpio);
1519
1520         result = usb_autopm_get_interface(serial->interface);
1521         if (result)
1522                 goto out;
1523
1524         switch (priv->partnum) {
1525         case CP210X_PARTNUM_CP2105:
1526                 buf.mask = (u8)mask;
1527                 buf.state = (u8)state;
1528                 result = cp210x_write_vendor_block(serial,
1529                                                    REQTYPE_HOST_TO_INTERFACE,
1530                                                    CP210X_WRITE_LATCH, &buf,
1531                                                    sizeof(buf));
1532                 break;
1533         case CP210X_PARTNUM_CP2108:
1534                 buf16.mask = cpu_to_le16(mask);
1535                 buf16.state = cpu_to_le16(state);
1536                 result = cp210x_write_vendor_block(serial,
1537                                                    REQTYPE_HOST_TO_INTERFACE,
1538                                                    CP210X_WRITE_LATCH, &buf16,
1539                                                    sizeof(buf16));
1540                 break;
1541         default:
1542                 wIndex = state << 8 | mask;
1543                 result = usb_control_msg(serial->dev,
1544                                          usb_sndctrlpipe(serial->dev, 0),
1545                                          CP210X_VENDOR_SPECIFIC,
1546                                          REQTYPE_HOST_TO_DEVICE,
1547                                          CP210X_WRITE_LATCH,
1548                                          wIndex,
1549                                          NULL, 0, USB_CTRL_SET_TIMEOUT);
1550                 break;
1551         }
1552
1553         usb_autopm_put_interface(serial->interface);
1554 out:
1555         if (result < 0) {
1556                 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n",
1557                                 result);
1558         }
1559 }
1560
1561 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1562 {
1563         struct usb_serial *serial = gpiochip_get_data(gc);
1564         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1565
1566         return priv->gpio_input & BIT(gpio);
1567 }
1568
1569 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1570 {
1571         struct usb_serial *serial = gpiochip_get_data(gc);
1572         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1573
1574         if (priv->partnum == CP210X_PARTNUM_CP2105) {
1575                 /* hardware does not support an input mode */
1576                 return -ENOTSUPP;
1577         }
1578
1579         /* push-pull pins cannot be changed to be inputs */
1580         if (priv->gpio_pushpull & BIT(gpio))
1581                 return -EINVAL;
1582
1583         /* make sure to release pin if it is being driven low */
1584         cp210x_gpio_set(gc, gpio, 1);
1585
1586         priv->gpio_input |= BIT(gpio);
1587
1588         return 0;
1589 }
1590
1591 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1592                                         int value)
1593 {
1594         struct usb_serial *serial = gpiochip_get_data(gc);
1595         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1596
1597         priv->gpio_input &= ~BIT(gpio);
1598         cp210x_gpio_set(gc, gpio, value);
1599
1600         return 0;
1601 }
1602
1603 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1604                                   unsigned long config)
1605 {
1606         struct usb_serial *serial = gpiochip_get_data(gc);
1607         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1608         enum pin_config_param param = pinconf_to_config_param(config);
1609
1610         /* Succeed only if in correct mode (this can't be set at runtime) */
1611         if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1612             (priv->gpio_pushpull & BIT(gpio)))
1613                 return 0;
1614
1615         if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1616             !(priv->gpio_pushpull & BIT(gpio)))
1617                 return 0;
1618
1619         return -ENOTSUPP;
1620 }
1621
1622 static int cp210x_gpio_init_valid_mask(struct gpio_chip *gc,
1623                 unsigned long *valid_mask, unsigned int ngpios)
1624 {
1625         struct usb_serial *serial = gpiochip_get_data(gc);
1626         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1627         struct device *dev = &serial->interface->dev;
1628         unsigned long altfunc_mask = priv->gpio_altfunc;
1629
1630         bitmap_complement(valid_mask, &altfunc_mask, ngpios);
1631
1632         if (bitmap_empty(valid_mask, ngpios))
1633                 dev_dbg(dev, "no pin configured for GPIO\n");
1634         else
1635                 dev_dbg(dev, "GPIO.%*pbl configured for GPIO\n", ngpios,
1636                                 valid_mask);
1637         return 0;
1638 }
1639
1640 /*
1641  * This function is for configuring GPIO using shared pins, where other signals
1642  * are made unavailable by configuring the use of GPIO. This is believed to be
1643  * only applicable to the cp2105 at this point, the other devices supported by
1644  * this driver that provide GPIO do so in a way that does not impact other
1645  * signals and are thus expected to have very different initialisation.
1646  */
1647 static int cp2105_gpioconf_init(struct usb_serial *serial)
1648 {
1649         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1650         struct cp210x_pin_mode mode;
1651         struct cp210x_dual_port_config config;
1652         u8 intf_num = cp210x_interface_num(serial);
1653         u8 iface_config;
1654         int result;
1655
1656         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1657                                           CP210X_GET_DEVICEMODE, &mode,
1658                                           sizeof(mode));
1659         if (result < 0)
1660                 return result;
1661
1662         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1663                                           CP210X_GET_PORTCONFIG, &config,
1664                                           sizeof(config));
1665         if (result < 0)
1666                 return result;
1667
1668         /*  2 banks of GPIO - One for the pins taken from each serial port */
1669         if (intf_num == 0) {
1670                 priv->gc.ngpio = 2;
1671
1672                 if (mode.eci == CP210X_PIN_MODE_MODEM) {
1673                         /* mark all GPIOs of this interface as reserved */
1674                         priv->gpio_altfunc = 0xff;
1675                         return 0;
1676                 }
1677
1678                 iface_config = config.eci_cfg;
1679                 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1680                                                 CP210X_ECI_GPIO_MODE_MASK) >>
1681                                                 CP210X_ECI_GPIO_MODE_OFFSET);
1682         } else if (intf_num == 1) {
1683                 priv->gc.ngpio = 3;
1684
1685                 if (mode.sci == CP210X_PIN_MODE_MODEM) {
1686                         /* mark all GPIOs of this interface as reserved */
1687                         priv->gpio_altfunc = 0xff;
1688                         return 0;
1689                 }
1690
1691                 iface_config = config.sci_cfg;
1692                 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1693                                                 CP210X_SCI_GPIO_MODE_MASK) >>
1694                                                 CP210X_SCI_GPIO_MODE_OFFSET);
1695         } else {
1696                 return -ENODEV;
1697         }
1698
1699         /* mark all pins which are not in GPIO mode */
1700         if (iface_config & CP2105_GPIO0_TXLED_MODE)     /* GPIO 0 */
1701                 priv->gpio_altfunc |= BIT(0);
1702         if (iface_config & (CP2105_GPIO1_RXLED_MODE |   /* GPIO 1 */
1703                         CP2105_GPIO1_RS485_MODE))
1704                 priv->gpio_altfunc |= BIT(1);
1705
1706         /* driver implementation for CP2105 only supports outputs */
1707         priv->gpio_input = 0;
1708
1709         return 0;
1710 }
1711
1712 static int cp2104_gpioconf_init(struct usb_serial *serial)
1713 {
1714         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1715         struct cp210x_single_port_config config;
1716         u8 iface_config;
1717         u8 gpio_latch;
1718         int result;
1719         u8 i;
1720
1721         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1722                                           CP210X_GET_PORTCONFIG, &config,
1723                                           sizeof(config));
1724         if (result < 0)
1725                 return result;
1726
1727         priv->gc.ngpio = 4;
1728
1729         iface_config = config.device_cfg;
1730         priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1731                                         CP210X_GPIO_MODE_MASK) >>
1732                                         CP210X_GPIO_MODE_OFFSET);
1733         gpio_latch = (u8)((le16_to_cpu(config.reset_state) &
1734                                         CP210X_GPIO_MODE_MASK) >>
1735                                         CP210X_GPIO_MODE_OFFSET);
1736
1737         /* mark all pins which are not in GPIO mode */
1738         if (iface_config & CP2104_GPIO0_TXLED_MODE)     /* GPIO 0 */
1739                 priv->gpio_altfunc |= BIT(0);
1740         if (iface_config & CP2104_GPIO1_RXLED_MODE)     /* GPIO 1 */
1741                 priv->gpio_altfunc |= BIT(1);
1742         if (iface_config & CP2104_GPIO2_RS485_MODE)     /* GPIO 2 */
1743                 priv->gpio_altfunc |= BIT(2);
1744
1745         /*
1746          * Like CP2102N, CP2104 has also no strict input and output pin
1747          * modes.
1748          * Do the same input mode emulation as CP2102N.
1749          */
1750         for (i = 0; i < priv->gc.ngpio; ++i) {
1751                 /*
1752                  * Set direction to "input" iff pin is open-drain and reset
1753                  * value is 1.
1754                  */
1755                 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1756                         priv->gpio_input |= BIT(i);
1757         }
1758
1759         return 0;
1760 }
1761
1762 static int cp2108_gpio_init(struct usb_serial *serial)
1763 {
1764         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1765         struct cp210x_quad_port_config config;
1766         u16 gpio_latch;
1767         int result;
1768         u8 i;
1769
1770         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1771                                           CP210X_GET_PORTCONFIG, &config,
1772                                           sizeof(config));
1773         if (result < 0)
1774                 return result;
1775
1776         priv->gc.ngpio = 16;
1777         priv->gpio_pushpull = le16_to_cpu(config.reset_state.gpio_mode_pb1);
1778         gpio_latch = le16_to_cpu(config.reset_state.gpio_latch_pb1);
1779
1780         /*
1781          * Mark all pins which are not in GPIO mode.
1782          *
1783          * Refer to table 9.1 "GPIO Mode alternate Functions" in the datasheet:
1784          * https://www.silabs.com/documents/public/data-sheets/cp2108-datasheet.pdf
1785          *
1786          * Alternate functions of GPIO0 to GPIO3 are determine by enhancedfxn_ifc[0]
1787          * and the similarly for the other pins; enhancedfxn_ifc[1]: GPIO4 to GPIO7,
1788          * enhancedfxn_ifc[2]: GPIO8 to GPIO11, enhancedfxn_ifc[3]: GPIO12 to GPIO15.
1789          */
1790         for (i = 0; i < 4; i++) {
1791                 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_TXLED)
1792                         priv->gpio_altfunc |= BIT(i * 4);
1793                 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RXLED)
1794                         priv->gpio_altfunc |= BIT((i * 4) + 1);
1795                 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RS485)
1796                         priv->gpio_altfunc |= BIT((i * 4) + 2);
1797                 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_CLOCK)
1798                         priv->gpio_altfunc |= BIT((i * 4) + 3);
1799         }
1800
1801         /*
1802          * Like CP2102N, CP2108 has also no strict input and output pin
1803          * modes. Do the same input mode emulation as CP2102N.
1804          */
1805         for (i = 0; i < priv->gc.ngpio; ++i) {
1806                 /*
1807                  * Set direction to "input" iff pin is open-drain and reset
1808                  * value is 1.
1809                  */
1810                 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1811                         priv->gpio_input |= BIT(i);
1812         }
1813
1814         return 0;
1815 }
1816
1817 static int cp2102n_gpioconf_init(struct usb_serial *serial)
1818 {
1819         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1820         const u16 config_size = 0x02a6;
1821         u8 gpio_rst_latch;
1822         u8 config_version;
1823         u8 gpio_pushpull;
1824         u8 *config_buf;
1825         u8 gpio_latch;
1826         u8 gpio_ctrl;
1827         int result;
1828         u8 i;
1829
1830         /*
1831          * Retrieve device configuration from the device.
1832          * The array received contains all customization settings done at the
1833          * factory/manufacturer. Format of the array is documented at the
1834          * time of writing at:
1835          * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa
1836          */
1837         config_buf = kmalloc(config_size, GFP_KERNEL);
1838         if (!config_buf)
1839                 return -ENOMEM;
1840
1841         result = cp210x_read_vendor_block(serial,
1842                                           REQTYPE_DEVICE_TO_HOST,
1843                                           CP210X_READ_2NCONFIG,
1844                                           config_buf,
1845                                           config_size);
1846         if (result < 0) {
1847                 kfree(config_buf);
1848                 return result;
1849         }
1850
1851         config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX];
1852         gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX];
1853         gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX];
1854         gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX];
1855
1856         kfree(config_buf);
1857
1858         /* Make sure this is a config format we understand. */
1859         if (config_version != 0x01)
1860                 return -ENOTSUPP;
1861
1862         priv->gc.ngpio = 4;
1863
1864         /*
1865          * Get default pin states after reset. Needed so we can determine
1866          * the direction of an open-drain pin.
1867          */
1868         gpio_latch = (gpio_rst_latch >> 3) & 0x0f;
1869
1870         /* 0 indicates open-drain mode, 1 is push-pull */
1871         priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f;
1872
1873         /* 0 indicates GPIO mode, 1 is alternate function */
1874         if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) {
1875                 /* QFN20 is special... */
1876                 if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE)   /* GPIO 0 */
1877                         priv->gpio_altfunc |= BIT(0);
1878                 if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */
1879                         priv->gpio_altfunc |= BIT(1);
1880                 if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */
1881                         priv->gpio_altfunc |= BIT(2);
1882                 if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */
1883                         priv->gpio_altfunc |= BIT(3);
1884         } else {
1885                 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f;
1886         }
1887
1888         if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) {
1889                 /*
1890                  * For the QFN28 package, GPIO4-6 are controlled by
1891                  * the low three bits of the mode/latch fields.
1892                  * Contrary to the document linked above, the bits for
1893                  * the SUSPEND pins are elsewhere.  No alternate
1894                  * function is available for these pins.
1895                  */
1896                 priv->gc.ngpio = 7;
1897                 gpio_latch |= (gpio_rst_latch & 7) << 4;
1898                 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4;
1899         }
1900
1901         /*
1902          * The CP2102N does not strictly has input and output pin modes,
1903          * it only knows open-drain and push-pull modes which is set at
1904          * factory. An open-drain pin can function both as an
1905          * input or an output. We emulate input mode for open-drain pins
1906          * by making sure they are not driven low, and we do not allow
1907          * push-pull pins to be set as an input.
1908          */
1909         for (i = 0; i < priv->gc.ngpio; ++i) {
1910                 /*
1911                  * Set direction to "input" iff pin is open-drain and reset
1912                  * value is 1.
1913                  */
1914                 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1915                         priv->gpio_input |= BIT(i);
1916         }
1917
1918         return 0;
1919 }
1920
1921 static int cp210x_gpio_init(struct usb_serial *serial)
1922 {
1923         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1924         int result;
1925
1926         switch (priv->partnum) {
1927         case CP210X_PARTNUM_CP2104:
1928                 result = cp2104_gpioconf_init(serial);
1929                 break;
1930         case CP210X_PARTNUM_CP2105:
1931                 result = cp2105_gpioconf_init(serial);
1932                 break;
1933         case CP210X_PARTNUM_CP2108:
1934                 /*
1935                  * The GPIOs are not tied to any specific port so only register
1936                  * once for interface 0.
1937                  */
1938                 if (cp210x_interface_num(serial) != 0)
1939                         return 0;
1940                 result = cp2108_gpio_init(serial);
1941                 break;
1942         case CP210X_PARTNUM_CP2102N_QFN28:
1943         case CP210X_PARTNUM_CP2102N_QFN24:
1944         case CP210X_PARTNUM_CP2102N_QFN20:
1945                 result = cp2102n_gpioconf_init(serial);
1946                 break;
1947         default:
1948                 return 0;
1949         }
1950
1951         if (result < 0)
1952                 return result;
1953
1954         priv->gc.label = "cp210x";
1955         priv->gc.get_direction = cp210x_gpio_direction_get;
1956         priv->gc.direction_input = cp210x_gpio_direction_input;
1957         priv->gc.direction_output = cp210x_gpio_direction_output;
1958         priv->gc.get = cp210x_gpio_get;
1959         priv->gc.set = cp210x_gpio_set;
1960         priv->gc.set_config = cp210x_gpio_set_config;
1961         priv->gc.init_valid_mask = cp210x_gpio_init_valid_mask;
1962         priv->gc.owner = THIS_MODULE;
1963         priv->gc.parent = &serial->interface->dev;
1964         priv->gc.base = -1;
1965         priv->gc.can_sleep = true;
1966
1967         result = gpiochip_add_data(&priv->gc, serial);
1968         if (!result)
1969                 priv->gpio_registered = true;
1970
1971         return result;
1972 }
1973
1974 static void cp210x_gpio_remove(struct usb_serial *serial)
1975 {
1976         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1977
1978         if (priv->gpio_registered) {
1979                 gpiochip_remove(&priv->gc);
1980                 priv->gpio_registered = false;
1981         }
1982 }
1983
1984 #else
1985
1986 static int cp210x_gpio_init(struct usb_serial *serial)
1987 {
1988         return 0;
1989 }
1990
1991 static void cp210x_gpio_remove(struct usb_serial *serial)
1992 {
1993         /* Nothing to do */
1994 }
1995
1996 #endif
1997
1998 static int cp210x_port_probe(struct usb_serial_port *port)
1999 {
2000         struct usb_serial *serial = port->serial;
2001         struct cp210x_port_private *port_priv;
2002
2003         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
2004         if (!port_priv)
2005                 return -ENOMEM;
2006
2007         port_priv->bInterfaceNumber = cp210x_interface_num(serial);
2008         mutex_init(&port_priv->mutex);
2009
2010         usb_set_serial_port_data(port, port_priv);
2011
2012         return 0;
2013 }
2014
2015 static void cp210x_port_remove(struct usb_serial_port *port)
2016 {
2017         struct cp210x_port_private *port_priv;
2018
2019         port_priv = usb_get_serial_port_data(port);
2020         kfree(port_priv);
2021 }
2022
2023 static void cp210x_init_max_speed(struct usb_serial *serial)
2024 {
2025         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2026         bool use_actual_rate = false;
2027         speed_t min = 300;
2028         speed_t max;
2029
2030         switch (priv->partnum) {
2031         case CP210X_PARTNUM_CP2101:
2032                 max = 921600;
2033                 break;
2034         case CP210X_PARTNUM_CP2102:
2035         case CP210X_PARTNUM_CP2103:
2036                 max = 1000000;
2037                 break;
2038         case CP210X_PARTNUM_CP2104:
2039                 use_actual_rate = true;
2040                 max = 2000000;
2041                 break;
2042         case CP210X_PARTNUM_CP2108:
2043                 max = 2000000;
2044                 break;
2045         case CP210X_PARTNUM_CP2105:
2046                 if (cp210x_interface_num(serial) == 0) {
2047                         use_actual_rate = true;
2048                         max = 2000000;  /* ECI */
2049                 } else {
2050                         min = 2400;
2051                         max = 921600;   /* SCI */
2052                 }
2053                 break;
2054         case CP210X_PARTNUM_CP2102N_QFN28:
2055         case CP210X_PARTNUM_CP2102N_QFN24:
2056         case CP210X_PARTNUM_CP2102N_QFN20:
2057                 use_actual_rate = true;
2058                 max = 3000000;
2059                 break;
2060         default:
2061                 max = 2000000;
2062                 break;
2063         }
2064
2065         priv->min_speed = min;
2066         priv->max_speed = max;
2067         priv->use_actual_rate = use_actual_rate;
2068 }
2069
2070 static void cp2102_determine_quirks(struct usb_serial *serial)
2071 {
2072         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2073         u8 *buf;
2074         int ret;
2075
2076         buf = kmalloc(2, GFP_KERNEL);
2077         if (!buf)
2078                 return;
2079         /*
2080          * Some (possibly counterfeit) CP2102 do not support event-insertion
2081          * mode and respond differently to malformed vendor requests.
2082          * Specifically, they return one instead of two bytes when sent a
2083          * two-byte part-number request.
2084          */
2085         ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2086                         CP210X_VENDOR_SPECIFIC, REQTYPE_DEVICE_TO_HOST,
2087                         CP210X_GET_PARTNUM, 0, buf, 2, USB_CTRL_GET_TIMEOUT);
2088         if (ret == 1) {
2089                 dev_dbg(&serial->interface->dev,
2090                                 "device does not support event-insertion mode\n");
2091                 priv->no_event_mode = true;
2092         }
2093
2094         kfree(buf);
2095 }
2096
2097 static int cp210x_get_fw_version(struct usb_serial *serial, u16 value)
2098 {
2099         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2100         u8 ver[3];
2101         int ret;
2102
2103         ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, value,
2104                         ver, sizeof(ver));
2105         if (ret)
2106                 return ret;
2107
2108         dev_dbg(&serial->interface->dev, "%s - %d.%d.%d\n", __func__,
2109                         ver[0], ver[1], ver[2]);
2110
2111         priv->fw_version = ver[0] << 16 | ver[1] << 8 | ver[2];
2112
2113         return 0;
2114 }
2115
2116 static void cp210x_determine_type(struct usb_serial *serial)
2117 {
2118         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2119         int ret;
2120
2121         ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
2122                         CP210X_GET_PARTNUM, &priv->partnum,
2123                         sizeof(priv->partnum));
2124         if (ret < 0) {
2125                 dev_warn(&serial->interface->dev,
2126                                 "querying part number failed\n");
2127                 priv->partnum = CP210X_PARTNUM_UNKNOWN;
2128                 return;
2129         }
2130
2131         dev_dbg(&serial->interface->dev, "partnum = 0x%02x\n", priv->partnum);
2132
2133         switch (priv->partnum) {
2134         case CP210X_PARTNUM_CP2102:
2135                 cp2102_determine_quirks(serial);
2136                 break;
2137         case CP210X_PARTNUM_CP2105:
2138         case CP210X_PARTNUM_CP2108:
2139                 cp210x_get_fw_version(serial, CP210X_GET_FW_VER);
2140                 break;
2141         case CP210X_PARTNUM_CP2102N_QFN28:
2142         case CP210X_PARTNUM_CP2102N_QFN24:
2143         case CP210X_PARTNUM_CP2102N_QFN20:
2144                 ret = cp210x_get_fw_version(serial, CP210X_GET_FW_VER_2N);
2145                 if (ret)
2146                         break;
2147                 if (priv->fw_version <= 0x10004)
2148                         priv->no_flow_control = true;
2149                 break;
2150         default:
2151                 break;
2152         }
2153 }
2154
2155 static int cp210x_attach(struct usb_serial *serial)
2156 {
2157         int result;
2158         struct cp210x_serial_private *priv;
2159
2160         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2161         if (!priv)
2162                 return -ENOMEM;
2163
2164         usb_set_serial_data(serial, priv);
2165
2166         cp210x_determine_type(serial);
2167         cp210x_init_max_speed(serial);
2168
2169         result = cp210x_gpio_init(serial);
2170         if (result < 0) {
2171                 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n",
2172                                 result);
2173         }
2174
2175         return 0;
2176 }
2177
2178 static void cp210x_disconnect(struct usb_serial *serial)
2179 {
2180         cp210x_gpio_remove(serial);
2181 }
2182
2183 static void cp210x_release(struct usb_serial *serial)
2184 {
2185         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2186
2187         cp210x_gpio_remove(serial);
2188
2189         kfree(priv);
2190 }
2191
2192 module_usb_serial_driver(serial_drivers, id_table);
2193
2194 MODULE_DESCRIPTION(DRIVER_DESC);
2195 MODULE_LICENSE("GPL v2");