drivers/usb/serial/cp210x.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
   4  *
   5  * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
   6  * Copyright (C) 2010-2021 Johan Hovold (johan@kernel.org)
   7  *
   8  * Support to set flow control line levels using TIOCMGET and TIOCMSET
   9  * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
  10  * control thanks to Munir Nassar nassarmu@real-time.com
  11  *
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/errno.h>
  16 #include <linux/slab.h>
  17 #include <linux/tty.h>
  18 #include <linux/tty_flip.h>
  19 #include <linux/module.h>
  20 #include <linux/usb.h>
  21 #include <linux/usb/serial.h>
  22 #include <linux/gpio/driver.h>
  23 #include <linux/bitops.h>
  24 #include <linux/mutex.h>
  25
  26 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
  27
  28 /*
  29  * Function Prototypes
  30  */
  31 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
  32 static void cp210x_close(struct usb_serial_port *);
  33 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
  34                                 const struct ktermios *);
  35 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
  36                                const struct ktermios *);
  37 static bool cp210x_tx_empty(struct usb_serial_port *port);
  38 static int cp210x_tiocmget(struct tty_struct *);
  39 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
  40 static int cp210x_tiocmset_port(struct usb_serial_port *port,
  41                 unsigned int, unsigned int);
  42 static 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(0x04BF, 0x1301) }, /* TDK Corporation NC0110013M - Network Controller */
  60         { USB_DEVICE(0x04BF, 0x1303) }, /* TDK Corporation MM0110113M - i3 Micro Module */
  61         { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
  62         { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
  63         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
  64         { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
  65         { USB_DEVICE(0x0908, 0x0070) }, /* Siemens SCALANCE LPE-9000 USB Serial Console */
  66         { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
  67         { USB_DEVICE(0x0988, 0x0578) }, /* Teraoka AD2000 */
  68         { USB_DEVICE(0x0B00, 0x3070) }, /* Ingenico 3070 */
  69         { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
  70         { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
  71         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  72         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
  73         { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
  74         { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
  75         { USB_DEVICE(0x106F, 0x0003) }, /* CPI / Money Controls Bulk Coin Recycler */
  76         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  77         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  78         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  79         { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
  80         { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
  81         { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
  82         { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
  83         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  84         { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
  85         { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
  86         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
  87         { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
  88         { USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */
  89         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  90         { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
  91         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  92         { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
  93         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  94         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
  95         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  96         { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
  97         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  98         { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
  99         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
 100         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
 101         { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
 102         { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
 103         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
 104         { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
 105         { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */
 106         { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */
 107         { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */
 108         { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
 109         { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
 110         { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
 111         { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
 112         { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
 113         { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
 114         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
 115         { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
 116         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
 117         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
 118         { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
 119         { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
 120         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
 121         { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
 122         { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
 123         { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
 124         { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
 125         { USB_DEVICE(0x10C4, 0x82AA) }, /* Silicon Labs IFS-USB-DATACABLE used with Quint UPS */
 126         { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */
 127         { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */
 128         { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */
 129         { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
 130         { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
 131         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
 132         { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
 133         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
 134         { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */
 135         { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
 136         { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
 137         { USB_DEVICE(0x10C4, 0x8414) }, /* Decagon USB Cable Adapter */
 138         { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
 139         { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
 140         { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
 141         { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
 142         { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
 143         { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */
 144         { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */
 145         { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */
 146         { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
 147         { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
 148         { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
 149         { USB_DEVICE(0x10C4, 0x863C) }, /* MGP Instruments PDS100 */
 150         { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
 151         { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
 152         { USB_DEVICE(0x10C4, 0x87ED) }, /* IMST USB-Stick for Smart Meter */
 153         { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
 154         { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
 155         { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
 156         { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
 157         { USB_DEVICE(0x10C4, 0x88D8) }, /* Acuity Brands nLight Air Adapter */
 158         { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */
 159         { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */
 160         { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
 161         { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
 162         { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
 163         { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
 164         { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */
 165         { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */
 166         { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
 167         { USB_DEVICE(0x10C4, 0x8A5B) }, /* CEL EM3588 ZigBee USB Stick */
 168         { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
 169         { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
 170         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 171         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 172         { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */
 173         { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
 174         { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
 175         { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */
 176         { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */
 177         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 178         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 179         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 180         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 181         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 182         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 183         { USB_DEVICE(0x11CA, 0x0212) }, /* Verifone USB to Printer (UART, CP2102) */
 184         { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
 185         { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
 186         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 187         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 188         { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */
 189         { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
 190         { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
 191         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 192         { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
 193         { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
 194         { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
 195         { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
 196         { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
 197         { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
 198         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 199         { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
 200         { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
 201         { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
 202         { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
 203         { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
 204         { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
 205         { USB_DEVICE(0x17A8, 0x0011) }, /* Kamstrup 444 MHz RF sniffer */
 206         { USB_DEVICE(0x17A8, 0x0013) }, /* Kamstrup 870 MHz RF sniffer */
 207         { USB_DEVICE(0x17A8, 0x0101) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Int Ant) */
 208         { USB_DEVICE(0x17A8, 0x0102) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Ext Ant) */
 209         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
 210         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
 211         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 212         { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
 213         { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
 214         { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
 215         { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
 216         { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
 217         { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
 218         { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
 219         { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
 220         { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 M.2 Key E serial interface */
 221         { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 Display serial interface */
 222         { USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */
 223         { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
 224         { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
 225         { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
 226         { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
 227         { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
 228         { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
 229         { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
 230         { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
 231         { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
 232         { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
 233         { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
 234         { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
 235         { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
 236         { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
 237         { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
 238         { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
 239         { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
 240         { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
 241         { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
 242         { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
 243         { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
 244         { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
 245         { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
 246         { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
 247         { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
 248         { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
 249         { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
 250         { USB_DEVICE(0x2184, 0x0030) }, /* GW Instek GDM-834x Digital Multimeter */
 251         { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
 252         { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
 253         { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
 254         { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
 255         { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
 256         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 257         { } /* Terminating Entry */
 258 };
 259
 260 MODULE_DEVICE_TABLE(usb, id_table);
 261
 262 struct cp210x_serial_private {
 263 #ifdef CONFIG_GPIOLIB
 264         struct gpio_chip        gc;
 265         bool                    gpio_registered;
 266         u16                     gpio_pushpull;
 267         u16                     gpio_altfunc;
 268         u16                     gpio_input;
 269 #endif
 270         u8                      partnum;
 271         u32                     fw_version;
 272         speed_t                 min_speed;
 273         speed_t                 max_speed;
 274         bool                    use_actual_rate;
 275         bool                    no_flow_control;
 276         bool                    no_event_mode;
 277 };
 278
 279 enum cp210x_event_state {
 280         ES_DATA,
 281         ES_ESCAPE,
 282         ES_LSR,
 283         ES_LSR_DATA_0,
 284         ES_LSR_DATA_1,
 285         ES_MSR
 286 };
 287
 288 struct cp210x_port_private {
 289         u8                      bInterfaceNumber;
 290         bool                    event_mode;
 291         enum cp210x_event_state event_state;
 292         u8                      lsr;
 293
 294         struct mutex            mutex;
 295         bool                    crtscts;
 296         bool                    dtr;
 297         bool                    rts;
 298 };
 299
 300 static struct usb_serial_driver cp210x_device = {
 301         .driver = {
 302                 .owner =        THIS_MODULE,
 303                 .name =         "cp210x",
 304         },
 305         .id_table               = id_table,
 306         .num_ports              = 1,
 307         .bulk_in_size           = 256,
 308         .bulk_out_size          = 256,
 309         .open                   = cp210x_open,
 310         .close                  = cp210x_close,
 311         .break_ctl              = cp210x_break_ctl,
 312         .set_termios            = cp210x_set_termios,
 313         .tx_empty               = cp210x_tx_empty,
 314         .throttle               = usb_serial_generic_throttle,
 315         .unthrottle             = usb_serial_generic_unthrottle,
 316         .tiocmget               = cp210x_tiocmget,
 317         .tiocmset               = cp210x_tiocmset,
 318         .get_icount             = usb_serial_generic_get_icount,
 319         .attach                 = cp210x_attach,
 320         .disconnect             = cp210x_disconnect,
 321         .release                = cp210x_release,
 322         .port_probe             = cp210x_port_probe,
 323         .port_remove            = cp210x_port_remove,
 324         .dtr_rts                = cp210x_dtr_rts,
 325         .process_read_urb       = cp210x_process_read_urb,
 326 };
 327
 328 static struct usb_serial_driver * const serial_drivers[] = {
 329         &cp210x_device, NULL
 330 };
 331
 332 /* Config request types */
 333 #define REQTYPE_HOST_TO_INTERFACE       0x41
 334 #define REQTYPE_INTERFACE_TO_HOST       0xc1
 335 #define REQTYPE_HOST_TO_DEVICE  0x40
 336 #define REQTYPE_DEVICE_TO_HOST  0xc0
 337
 338 /* Config request codes */
 339 #define CP210X_IFC_ENABLE       0x00
 340 #define CP210X_SET_BAUDDIV      0x01
 341 #define CP210X_GET_BAUDDIV      0x02
 342 #define CP210X_SET_LINE_CTL     0x03
 343 #define CP210X_GET_LINE_CTL     0x04
 344 #define CP210X_SET_BREAK        0x05
 345 #define CP210X_IMM_CHAR         0x06
 346 #define CP210X_SET_MHS          0x07
 347 #define CP210X_GET_MDMSTS       0x08
 348 #define CP210X_SET_XON          0x09
 349 #define CP210X_SET_XOFF         0x0A
 350 #define CP210X_SET_EVENTMASK    0x0B
 351 #define CP210X_GET_EVENTMASK    0x0C
 352 #define CP210X_SET_CHAR         0x0D
 353 #define CP210X_GET_CHARS        0x0E
 354 #define CP210X_GET_PROPS        0x0F
 355 #define CP210X_GET_COMM_STATUS  0x10
 356 #define CP210X_RESET            0x11
 357 #define CP210X_PURGE            0x12
 358 #define CP210X_SET_FLOW         0x13
 359 #define CP210X_GET_FLOW         0x14
 360 #define CP210X_EMBED_EVENTS     0x15
 361 #define CP210X_GET_EVENTSTATE   0x16
 362 #define CP210X_SET_CHARS        0x19
 363 #define CP210X_GET_BAUDRATE     0x1D
 364 #define CP210X_SET_BAUDRATE     0x1E
 365 #define CP210X_VENDOR_SPECIFIC  0xFF
 366
 367 /* CP210X_IFC_ENABLE */
 368 #define UART_ENABLE             0x0001
 369 #define UART_DISABLE            0x0000
 370
 371 /* CP210X_(SET|GET)_BAUDDIV */
 372 #define BAUD_RATE_GEN_FREQ      0x384000
 373
 374 /* CP210X_(SET|GET)_LINE_CTL */
 375 #define BITS_DATA_MASK          0X0f00
 376 #define BITS_DATA_5             0X0500
 377 #define BITS_DATA_6             0X0600
 378 #define BITS_DATA_7             0X0700
 379 #define BITS_DATA_8             0X0800
 380 #define BITS_DATA_9             0X0900
 381
 382 #define BITS_PARITY_MASK        0x00f0
 383 #define BITS_PARITY_NONE        0x0000
 384 #define BITS_PARITY_ODD         0x0010
 385 #define BITS_PARITY_EVEN        0x0020
 386 #define BITS_PARITY_MARK        0x0030
 387 #define BITS_PARITY_SPACE       0x0040
 388
 389 #define BITS_STOP_MASK          0x000f
 390 #define BITS_STOP_1             0x0000
 391 #define BITS_STOP_1_5           0x0001
 392 #define BITS_STOP_2             0x0002
 393
 394 /* CP210X_SET_BREAK */
 395 #define BREAK_ON                0x0001
 396 #define BREAK_OFF               0x0000
 397
 398 /* CP210X_(SET_MHS|GET_MDMSTS) */
 399 #define CONTROL_DTR             0x0001
 400 #define CONTROL_RTS             0x0002
 401 #define CONTROL_CTS             0x0010
 402 #define CONTROL_DSR             0x0020
 403 #define CONTROL_RING            0x0040
 404 #define CONTROL_DCD             0x0080
 405 #define CONTROL_WRITE_DTR       0x0100
 406 #define CONTROL_WRITE_RTS       0x0200
 407
 408 /* CP210X_(GET|SET)_CHARS */
 409 struct cp210x_special_chars {
 410         u8      bEofChar;
 411         u8      bErrorChar;
 412         u8      bBreakChar;
 413         u8      bEventChar;
 414         u8      bXonChar;
 415         u8      bXoffChar;
 416 };
 417
 418 /* CP210X_VENDOR_SPECIFIC values */
 419 #define CP210X_GET_FW_VER       0x000E
 420 #define CP210X_READ_2NCONFIG    0x000E
 421 #define CP210X_GET_FW_VER_2N    0x0010
 422 #define CP210X_READ_LATCH       0x00C2
 423 #define CP210X_GET_PARTNUM      0x370B
 424 #define CP210X_GET_PORTCONFIG   0x370C
 425 #define CP210X_GET_DEVICEMODE   0x3711
 426 #define CP210X_WRITE_LATCH      0x37E1
 427
 428 /* Part number definitions */
 429 #define CP210X_PARTNUM_CP2101   0x01
 430 #define CP210X_PARTNUM_CP2102   0x02
 431 #define CP210X_PARTNUM_CP2103   0x03
 432 #define CP210X_PARTNUM_CP2104   0x04
 433 #define CP210X_PARTNUM_CP2105   0x05
 434 #define CP210X_PARTNUM_CP2108   0x08
 435 #define CP210X_PARTNUM_CP2102N_QFN28    0x20
 436 #define CP210X_PARTNUM_CP2102N_QFN24    0x21
 437 #define CP210X_PARTNUM_CP2102N_QFN20    0x22
 438 #define CP210X_PARTNUM_UNKNOWN  0xFF
 439
 440 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
 441 struct cp210x_comm_status {
 442         __le32   ulErrors;
 443         __le32   ulHoldReasons;
 444         __le32   ulAmountInInQueue;
 445         __le32   ulAmountInOutQueue;
 446         u8       bEofReceived;
 447         u8       bWaitForImmediate;
 448         u8       bReserved;
 449 } __packed;
 450
 451 /*
 452  * CP210X_PURGE - 16 bits passed in wValue of USB request.
 453  * SiLabs app note AN571 gives a strange description of the 4 bits:
 454  * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
 455  * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
 456  */
 457 #define PURGE_ALL               0x000f
 458
 459 /* CP210X_EMBED_EVENTS */
 460 #define CP210X_ESCCHAR          0xec
 461
 462 #define CP210X_LSR_OVERRUN      BIT(1)
 463 #define CP210X_LSR_PARITY       BIT(2)
 464 #define CP210X_LSR_FRAME        BIT(3)
 465 #define CP210X_LSR_BREAK        BIT(4)
 466
 467
 468 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
 469 struct cp210x_flow_ctl {
 470         __le32  ulControlHandshake;
 471         __le32  ulFlowReplace;
 472         __le32  ulXonLimit;
 473         __le32  ulXoffLimit;
 474 };
 475
 476 /* cp210x_flow_ctl::ulControlHandshake */
 477 #define CP210X_SERIAL_DTR_MASK          GENMASK(1, 0)
 478 #define CP210X_SERIAL_DTR_INACTIVE      (0 << 0)
 479 #define CP210X_SERIAL_DTR_ACTIVE        (1 << 0)
 480 #define CP210X_SERIAL_DTR_FLOW_CTL      (2 << 0)
 481 #define CP210X_SERIAL_CTS_HANDSHAKE     BIT(3)
 482 #define CP210X_SERIAL_DSR_HANDSHAKE     BIT(4)
 483 #define CP210X_SERIAL_DCD_HANDSHAKE     BIT(5)
 484 #define CP210X_SERIAL_DSR_SENSITIVITY   BIT(6)
 485
 486 /* cp210x_flow_ctl::ulFlowReplace */
 487 #define CP210X_SERIAL_AUTO_TRANSMIT     BIT(0)
 488 #define CP210X_SERIAL_AUTO_RECEIVE      BIT(1)
 489 #define CP210X_SERIAL_ERROR_CHAR        BIT(2)
 490 #define CP210X_SERIAL_NULL_STRIPPING    BIT(3)
 491 #define CP210X_SERIAL_BREAK_CHAR        BIT(4)
 492 #define CP210X_SERIAL_RTS_MASK          GENMASK(7, 6)
 493 #define CP210X_SERIAL_RTS_INACTIVE      (0 << 6)
 494 #define CP210X_SERIAL_RTS_ACTIVE        (1 << 6)
 495 #define CP210X_SERIAL_RTS_FLOW_CTL      (2 << 6)
 496 #define CP210X_SERIAL_XOFF_CONTINUE     BIT(31)
 497
 498 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
 499 struct cp210x_pin_mode {
 500         u8      eci;
 501         u8      sci;
 502 };
 503
 504 #define CP210X_PIN_MODE_MODEM           0
 505 #define CP210X_PIN_MODE_GPIO            BIT(0)
 506
 507 /*
 508  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes
 509  * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes.
 510  */
 511 struct cp210x_dual_port_config {
 512         __le16  gpio_mode;
 513         u8      __pad0[2];
 514         __le16  reset_state;
 515         u8      __pad1[4];
 516         __le16  suspend_state;
 517         u8      sci_cfg;
 518         u8      eci_cfg;
 519         u8      device_cfg;
 520 } __packed;
 521
 522 /*
 523  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes
 524  * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes.
 525  */
 526 struct cp210x_single_port_config {
 527         __le16  gpio_mode;
 528         u8      __pad0[2];
 529         __le16  reset_state;
 530         u8      __pad1[4];
 531         __le16  suspend_state;
 532         u8      device_cfg;
 533 } __packed;
 534
 535 /* GPIO modes */
 536 #define CP210X_SCI_GPIO_MODE_OFFSET     9
 537 #define CP210X_SCI_GPIO_MODE_MASK       GENMASK(11, 9)
 538
 539 #define CP210X_ECI_GPIO_MODE_OFFSET     2
 540 #define CP210X_ECI_GPIO_MODE_MASK       GENMASK(3, 2)
 541
 542 #define CP210X_GPIO_MODE_OFFSET         8
 543 #define CP210X_GPIO_MODE_MASK           GENMASK(11, 8)
 544
 545 /* CP2105 port configuration values */
 546 #define CP2105_GPIO0_TXLED_MODE         BIT(0)
 547 #define CP2105_GPIO1_RXLED_MODE         BIT(1)
 548 #define CP2105_GPIO1_RS485_MODE         BIT(2)
 549
 550 /* CP2104 port configuration values */
 551 #define CP2104_GPIO0_TXLED_MODE         BIT(0)
 552 #define CP2104_GPIO1_RXLED_MODE         BIT(1)
 553 #define CP2104_GPIO2_RS485_MODE         BIT(2)
 554
 555 struct cp210x_quad_port_state {
 556         __le16 gpio_mode_pb0;
 557         __le16 gpio_mode_pb1;
 558         __le16 gpio_mode_pb2;
 559         __le16 gpio_mode_pb3;
 560         __le16 gpio_mode_pb4;
 561
 562         __le16 gpio_lowpower_pb0;
 563         __le16 gpio_lowpower_pb1;
 564         __le16 gpio_lowpower_pb2;
 565         __le16 gpio_lowpower_pb3;
 566         __le16 gpio_lowpower_pb4;
 567
 568         __le16 gpio_latch_pb0;
 569         __le16 gpio_latch_pb1;
 570         __le16 gpio_latch_pb2;
 571         __le16 gpio_latch_pb3;
 572         __le16 gpio_latch_pb4;
 573 };
 574
 575 /*
 576  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0x49 bytes
 577  * on a CP2108 chip.
 578  *
 579  * See https://www.silabs.com/documents/public/application-notes/an978-cp210x-usb-to-uart-api-specification.pdf
 580  */
 581 struct cp210x_quad_port_config {
 582         struct cp210x_quad_port_state reset_state;
 583         struct cp210x_quad_port_state suspend_state;
 584         u8 ipdelay_ifc[4];
 585         u8 enhancedfxn_ifc[4];
 586         u8 enhancedfxn_device;
 587         u8 extclkfreq[4];
 588 } __packed;
 589
 590 #define CP2108_EF_IFC_GPIO_TXLED                0x01
 591 #define CP2108_EF_IFC_GPIO_RXLED                0x02
 592 #define CP2108_EF_IFC_GPIO_RS485                0x04
 593 #define CP2108_EF_IFC_GPIO_RS485_LOGIC          0x08
 594 #define CP2108_EF_IFC_GPIO_CLOCK                0x10
 595 #define CP2108_EF_IFC_DYNAMIC_SUSPEND           0x40
 596
 597 /* CP2102N configuration array indices */
 598 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX      2
 599 #define CP210X_2NCONFIG_GPIO_MODE_IDX           581
 600 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX       587
 601 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX        600
 602
 603 /* CP2102N QFN20 port configuration values */
 604 #define CP2102N_QFN20_GPIO2_TXLED_MODE          BIT(2)
 605 #define CP2102N_QFN20_GPIO3_RXLED_MODE          BIT(3)
 606 #define CP2102N_QFN20_GPIO1_RS485_MODE          BIT(4)
 607 #define CP2102N_QFN20_GPIO0_CLK_MODE            BIT(6)
 608
 609 /*
 610  * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x02 bytes
 611  * for CP2102N, CP2103, CP2104 and CP2105.
 612  */
 613 struct cp210x_gpio_write {
 614         u8      mask;
 615         u8      state;
 616 };
 617
 618 /*
 619  * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x04 bytes
 620  * for CP2108.
 621  */
 622 struct cp210x_gpio_write16 {
 623         __le16  mask;
 624         __le16  state;
 625 };
 626
 627 /*
 628  * Helper to get interface number when we only have struct usb_serial.
 629  */
 630 static u8 cp210x_interface_num(struct usb_serial *serial)
 631 {
 632         struct usb_host_interface *cur_altsetting;
 633
 634         cur_altsetting = serial->interface->cur_altsetting;
 635
 636         return cur_altsetting->desc.bInterfaceNumber;
 637 }
 638
 639 /*
 640  * Reads a variable-sized block of CP210X_ registers, identified by req.
 641  * Returns data into buf in native USB byte order.
 642  */
 643 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
 644                 void *buf, int bufsize)
 645 {
 646         struct usb_serial *serial = port->serial;
 647         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 648         int result;
 649
 650
 651         result = usb_control_msg_recv(serial->dev, 0, req,
 652                         REQTYPE_INTERFACE_TO_HOST, 0,
 653                         port_priv->bInterfaceNumber, buf, bufsize,
 654                         USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
 655         if (result) {
 656                 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
 657                                 req, bufsize, result);
 658                 return result;
 659         }
 660
 661         return 0;
 662 }
 663
 664 /*
 665  * Reads any 8-bit CP210X_ register identified by req.
 666  */
 667 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
 668 {
 669         return cp210x_read_reg_block(port, req, val, sizeof(*val));
 670 }
 671
 672 /*
 673  * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
 674  * Returns data into buf in native USB byte order.
 675  */
 676 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
 677                                     void *buf, int bufsize)
 678 {
 679         int result;
 680
 681         result = usb_control_msg_recv(serial->dev, 0, CP210X_VENDOR_SPECIFIC,
 682                         type, val, cp210x_interface_num(serial), buf, bufsize,
 683                         USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
 684         if (result) {
 685                 dev_err(&serial->interface->dev,
 686                         "failed to get vendor val 0x%04x size %d: %d\n", val,
 687                         bufsize, result);
 688                 return result;
 689         }
 690
 691         return 0;
 692 }
 693
 694 /*
 695  * Writes any 16-bit CP210X_ register (req) whose value is passed
 696  * entirely in the wValue field of the USB request.
 697  */
 698 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
 699 {
 700         struct usb_serial *serial = port->serial;
 701         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 702         int result;
 703
 704         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 705                         req, REQTYPE_HOST_TO_INTERFACE, val,
 706                         port_priv->bInterfaceNumber, NULL, 0,
 707                         USB_CTRL_SET_TIMEOUT);
 708         if (result < 0) {
 709                 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
 710                                 req, result);
 711         }
 712
 713         return result;
 714 }
 715
 716 /*
 717  * Writes a variable-sized block of CP210X_ registers, identified by req.
 718  * Data in buf must be in native USB byte order.
 719  */
 720 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
 721                 void *buf, int bufsize)
 722 {
 723         struct usb_serial *serial = port->serial;
 724         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 725         int result;
 726
 727         result = usb_control_msg_send(serial->dev, 0, req,
 728                         REQTYPE_HOST_TO_INTERFACE, 0,
 729                         port_priv->bInterfaceNumber, buf, bufsize,
 730                         USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
 731         if (result) {
 732                 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
 733                                 req, bufsize, result);
 734                 return result;
 735         }
 736
 737         return 0;
 738 }
 739
 740 /*
 741  * Writes any 32-bit CP210X_ register identified by req.
 742  */
 743 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
 744 {
 745         __le32 le32_val;
 746
 747         le32_val = cpu_to_le32(val);
 748
 749         return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
 750 }
 751
 752 #ifdef CONFIG_GPIOLIB
 753 /*
 754  * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
 755  * Data in buf must be in native USB byte order.
 756  */
 757 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
 758                                      u16 val, void *buf, int bufsize)
 759 {
 760         int result;
 761
 762         result = usb_control_msg_send(serial->dev, 0, CP210X_VENDOR_SPECIFIC,
 763                         type, val, cp210x_interface_num(serial), buf, bufsize,
 764                         USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
 765         if (result) {
 766                 dev_err(&serial->interface->dev,
 767                         "failed to set vendor val 0x%04x size %d: %d\n", val,
 768                         bufsize, result);
 769                 return result;
 770         }
 771
 772         return 0;
 773 }
 774 #endif
 775
 776 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 777 {
 778         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 779         int result;
 780
 781         result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
 782         if (result) {
 783                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
 784                 return result;
 785         }
 786
 787         if (tty)
 788                 cp210x_set_termios(tty, port, NULL);
 789
 790         result = usb_serial_generic_open(tty, port);
 791         if (result)
 792                 goto err_disable;
 793
 794         return 0;
 795
 796 err_disable:
 797         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 798         port_priv->event_mode = false;
 799
 800         return result;
 801 }
 802
 803 static void cp210x_close(struct usb_serial_port *port)
 804 {
 805         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 806
 807         usb_serial_generic_close(port);
 808
 809         /* Clear both queues; cp2108 needs this to avoid an occasional hang */
 810         cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
 811
 812         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 813
 814         /* Disabling the interface disables event-insertion mode. */
 815         port_priv->event_mode = false;
 816 }
 817
 818 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag)
 819 {
 820         if (lsr & CP210X_LSR_BREAK) {
 821                 port->icount.brk++;
 822                 *flag = TTY_BREAK;
 823         } else if (lsr & CP210X_LSR_PARITY) {
 824                 port->icount.parity++;
 825                 *flag = TTY_PARITY;
 826         } else if (lsr & CP210X_LSR_FRAME) {
 827                 port->icount.frame++;
 828                 *flag = TTY_FRAME;
 829         }
 830
 831         if (lsr & CP210X_LSR_OVERRUN) {
 832                 port->icount.overrun++;
 833                 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
 834         }
 835 }
 836
 837 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag)
 838 {
 839         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 840
 841         switch (port_priv->event_state) {
 842         case ES_DATA:
 843                 if (*ch == CP210X_ESCCHAR) {
 844                         port_priv->event_state = ES_ESCAPE;
 845                         break;
 846                 }
 847                 return false;
 848         case ES_ESCAPE:
 849                 switch (*ch) {
 850                 case 0:
 851                         dev_dbg(&port->dev, "%s - escape char\n", __func__);
 852                         *ch = CP210X_ESCCHAR;
 853                         port_priv->event_state = ES_DATA;
 854                         return false;
 855                 case 1:
 856                         port_priv->event_state = ES_LSR_DATA_0;
 857                         break;
 858                 case 2:
 859                         port_priv->event_state = ES_LSR;
 860                         break;
 861                 case 3:
 862                         port_priv->event_state = ES_MSR;
 863                         break;
 864                 default:
 865                         dev_err(&port->dev, "malformed event 0x%02x\n", *ch);
 866                         port_priv->event_state = ES_DATA;
 867                         break;
 868                 }
 869                 break;
 870         case ES_LSR_DATA_0:
 871                 port_priv->lsr = *ch;
 872                 port_priv->event_state = ES_LSR_DATA_1;
 873                 break;
 874         case ES_LSR_DATA_1:
 875                 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n",
 876                                 __func__, port_priv->lsr, *ch);
 877                 cp210x_process_lsr(port, port_priv->lsr, flag);
 878                 port_priv->event_state = ES_DATA;
 879                 return false;
 880         case ES_LSR:
 881                 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch);
 882                 port_priv->lsr = *ch;
 883                 cp210x_process_lsr(port, port_priv->lsr, flag);
 884                 port_priv->event_state = ES_DATA;
 885                 break;
 886         case ES_MSR:
 887                 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch);
 888                 /* unimplemented */
 889                 port_priv->event_state = ES_DATA;
 890                 break;
 891         }
 892
 893         return true;
 894 }
 895
 896 static void cp210x_process_read_urb(struct urb *urb)
 897 {
 898         struct usb_serial_port *port = urb->context;
 899         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 900         unsigned char *ch = urb->transfer_buffer;
 901         char flag;
 902         int i;
 903
 904         if (!urb->actual_length)
 905                 return;
 906
 907         if (port_priv->event_mode) {
 908                 for (i = 0; i < urb->actual_length; i++, ch++) {
 909                         flag = TTY_NORMAL;
 910
 911                         if (cp210x_process_char(port, ch, &flag))
 912                                 continue;
 913
 914                         tty_insert_flip_char(&port->port, *ch, flag);
 915                 }
 916         } else {
 917                 tty_insert_flip_string(&port->port, ch, urb->actual_length);
 918         }
 919         tty_flip_buffer_push(&port->port);
 920 }
 921
 922 /*
 923  * Read how many bytes are waiting in the TX queue.
 924  */
 925 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
 926                 u32 *count)
 927 {
 928         struct usb_serial *serial = port->serial;
 929         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 930         struct cp210x_comm_status sts;
 931         int result;
 932
 933         result = usb_control_msg_recv(serial->dev, 0, CP210X_GET_COMM_STATUS,
 934                         REQTYPE_INTERFACE_TO_HOST, 0,
 935                         port_priv->bInterfaceNumber, &sts, sizeof(sts),
 936                         USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
 937         if (result) {
 938                 dev_err(&port->dev, "failed to get comm status: %d\n", result);
 939                 return result;
 940         }
 941
 942         *count = le32_to_cpu(sts.ulAmountInOutQueue);
 943
 944         return 0;
 945 }
 946
 947 static bool cp210x_tx_empty(struct usb_serial_port *port)
 948 {
 949         int err;
 950         u32 count;
 951
 952         err = cp210x_get_tx_queue_byte_count(port, &count);
 953         if (err)
 954                 return true;
 955
 956         return !count;
 957 }
 958
 959 struct cp210x_rate {
 960         speed_t rate;
 961         speed_t high;
 962 };
 963
 964 static const struct cp210x_rate cp210x_an205_table1[] = {
 965         { 300, 300 },
 966         { 600, 600 },
 967         { 1200, 1200 },
 968         { 1800, 1800 },
 969         { 2400, 2400 },
 970         { 4000, 4000 },
 971         { 4800, 4803 },
 972         { 7200, 7207 },
 973         { 9600, 9612 },
 974         { 14400, 14428 },
 975         { 16000, 16062 },
 976         { 19200, 19250 },
 977         { 28800, 28912 },
 978         { 38400, 38601 },
 979         { 51200, 51558 },
 980         { 56000, 56280 },
 981         { 57600, 58053 },
 982         { 64000, 64111 },
 983         { 76800, 77608 },
 984         { 115200, 117028 },
 985         { 128000, 129347 },
 986         { 153600, 156868 },
 987         { 230400, 237832 },
 988         { 250000, 254234 },
 989         { 256000, 273066 },
 990         { 460800, 491520 },
 991         { 500000, 567138 },
 992         { 576000, 670254 },
 993         { 921600, UINT_MAX }
 994 };
 995
 996 /*
 997  * Quantises the baud rate as per AN205 Table 1
 998  */
 999 static speed_t cp210x_get_an205_rate(speed_t baud)
1000 {
1001         int i;
1002
1003         for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) {
1004                 if (baud <= cp210x_an205_table1[i].high)
1005                         break;
1006         }
1007
1008         return cp210x_an205_table1[i].rate;
1009 }
1010
1011 static speed_t cp210x_get_actual_rate(speed_t baud)
1012 {
1013         unsigned int prescale = 1;
1014         unsigned int div;
1015
1016         if (baud <= 365)
1017                 prescale = 4;
1018
1019         div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud);
1020         baud = 48000000 / (2 * prescale * div);
1021
1022         return baud;
1023 }
1024
1025 /*
1026  * CP2101 supports the following baud rates:
1027  *
1028  *      300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1029  *      38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1030  *
1031  * CP2102 and CP2103 support the following additional rates:
1032  *
1033  *      4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1034  *      576000
1035  *
1036  * The device will map a requested rate to a supported one, but the result
1037  * of requests for rates greater than 1053257 is undefined (see AN205).
1038  *
1039  * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1040  * respectively, with an error less than 1%. The actual rates are determined
1041  * by
1042  *
1043  *      div = round(freq / (2 x prescale x request))
1044  *      actual = freq / (2 x prescale x div)
1045  *
1046  * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1047  * or 1 otherwise.
1048  * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1049  * otherwise.
1050  */
1051 static void cp210x_change_speed(struct tty_struct *tty,
1052                                 struct usb_serial_port *port,
1053                                 const struct ktermios *old_termios)
1054 {
1055         struct usb_serial *serial = port->serial;
1056         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1057         u32 baud;
1058
1059         if (tty->termios.c_ospeed == 0)
1060                 return;
1061
1062         /*
1063          * This maps the requested rate to the actual rate, a valid rate on
1064          * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed].
1065          */
1066         baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed);
1067
1068         if (priv->use_actual_rate)
1069                 baud = cp210x_get_actual_rate(baud);
1070         else if (baud < 1000000)
1071                 baud = cp210x_get_an205_rate(baud);
1072
1073         dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1074         if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1075                 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1076                 if (old_termios)
1077                         baud = old_termios->c_ospeed;
1078                 else
1079                         baud = 9600;
1080         }
1081
1082         tty_encode_baud_rate(tty, baud, baud);
1083 }
1084
1085 static void cp210x_enable_event_mode(struct usb_serial_port *port)
1086 {
1087         struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1088         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1089         int ret;
1090
1091         if (port_priv->event_mode)
1092                 return;
1093
1094         if (priv->no_event_mode)
1095                 return;
1096
1097         port_priv->event_state = ES_DATA;
1098         port_priv->event_mode = true;
1099
1100         ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR);
1101         if (ret) {
1102                 dev_err(&port->dev, "failed to enable events: %d\n", ret);
1103                 port_priv->event_mode = false;
1104         }
1105 }
1106
1107 static void cp210x_disable_event_mode(struct usb_serial_port *port)
1108 {
1109         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1110         int ret;
1111
1112         if (!port_priv->event_mode)
1113                 return;
1114
1115         ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0);
1116         if (ret) {
1117                 dev_err(&port->dev, "failed to disable events: %d\n", ret);
1118                 return;
1119         }
1120
1121         port_priv->event_mode = false;
1122 }
1123
1124 static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b)
1125 {
1126         bool iflag_change, cc_change;
1127
1128         iflag_change = ((a->c_iflag ^ b->c_iflag) & (INPCK | IXON | IXOFF));
1129         cc_change = a->c_cc[VSTART] != b->c_cc[VSTART] ||
1130                         a->c_cc[VSTOP] != b->c_cc[VSTOP];
1131
1132         return tty_termios_hw_change(a, b) || iflag_change || cc_change;
1133 }
1134
1135 static void cp210x_set_flow_control(struct tty_struct *tty,
1136                                     struct usb_serial_port *port,
1137                                     const struct ktermios *old_termios)
1138 {
1139         struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1140         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1141         struct cp210x_special_chars chars;
1142         struct cp210x_flow_ctl flow_ctl;
1143         u32 flow_repl;
1144         u32 ctl_hs;
1145         bool crtscts;
1146         int ret;
1147
1148         /*
1149          * Some CP2102N interpret ulXonLimit as ulFlowReplace (erratum
1150          * CP2102N_E104). Report back that flow control is not supported.
1151          */
1152         if (priv->no_flow_control) {
1153                 tty->termios.c_cflag &= ~CRTSCTS;
1154                 tty->termios.c_iflag &= ~(IXON | IXOFF);
1155         }
1156
1157         if (tty->termios.c_ospeed != 0 &&
1158                         old_termios && old_termios->c_ospeed != 0 &&
1159                         C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) &&
1160                         I_IXON(tty) == (old_termios->c_iflag & IXON) &&
1161                         I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) &&
1162                         START_CHAR(tty) == old_termios->c_cc[VSTART] &&
1163                         STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) {
1164                 return;
1165         }
1166
1167         if (I_IXON(tty) || I_IXOFF(tty)) {
1168                 memset(&chars, 0, sizeof(chars));
1169
1170                 chars.bXonChar = START_CHAR(tty);
1171                 chars.bXoffChar = STOP_CHAR(tty);
1172
1173                 ret = cp210x_write_reg_block(port, CP210X_SET_CHARS, &chars,
1174                                 sizeof(chars));
1175                 if (ret) {
1176                         dev_err(&port->dev, "failed to set special chars: %d\n",
1177                                         ret);
1178                 }
1179         }
1180
1181         mutex_lock(&port_priv->mutex);
1182
1183         if (tty->termios.c_ospeed == 0) {
1184                 port_priv->dtr = false;
1185                 port_priv->rts = false;
1186         } else if (old_termios && old_termios->c_ospeed == 0) {
1187                 port_priv->dtr = true;
1188                 port_priv->rts = true;
1189         }
1190
1191         ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1192                         sizeof(flow_ctl));
1193         if (ret)
1194                 goto out_unlock;
1195
1196         ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1197         flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1198
1199         ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1200         ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1201         ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1202         ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1203         if (port_priv->dtr)
1204                 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
1205         else
1206                 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
1207
1208         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1209         if (C_CRTSCTS(tty)) {
1210                 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1211                 if (port_priv->rts)
1212                         flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
1213                 else
1214                         flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1215                 crtscts = true;
1216         } else {
1217                 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1218                 if (port_priv->rts)
1219                         flow_repl |= CP210X_SERIAL_RTS_ACTIVE;
1220                 else
1221                         flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1222                 crtscts = false;
1223         }
1224
1225         if (I_IXOFF(tty)) {
1226                 flow_repl |= CP210X_SERIAL_AUTO_RECEIVE;
1227
1228                 flow_ctl.ulXonLimit = cpu_to_le32(128);
1229                 flow_ctl.ulXoffLimit = cpu_to_le32(128);
1230         } else {
1231                 flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE;
1232         }
1233
1234         if (I_IXON(tty))
1235                 flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT;
1236         else
1237                 flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT;
1238
1239         dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__,
1240                         ctl_hs, flow_repl);
1241
1242         flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1243         flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1244
1245         ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1246                         sizeof(flow_ctl));
1247         if (ret)
1248                 goto out_unlock;
1249
1250         port_priv->crtscts = crtscts;
1251 out_unlock:
1252         mutex_unlock(&port_priv->mutex);
1253 }
1254
1255 static void cp210x_set_termios(struct tty_struct *tty,
1256                                struct usb_serial_port *port,
1257                                const struct ktermios *old_termios)
1258 {
1259         struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1260         u16 bits;
1261         int ret;
1262
1263         if (old_termios && !cp210x_termios_change(&tty->termios, old_termios) &&
1264                         tty->termios.c_ospeed != 0)
1265                 return;
1266
1267         if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed)
1268                 cp210x_change_speed(tty, port, old_termios);
1269
1270         /* CP2101 only supports CS8, 1 stop bit and non-stick parity. */
1271         if (priv->partnum == CP210X_PARTNUM_CP2101) {
1272                 tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR);
1273                 tty->termios.c_cflag |= CS8;
1274         }
1275
1276         bits = 0;
1277
1278         switch (C_CSIZE(tty)) {
1279         case CS5:
1280                 bits |= BITS_DATA_5;
1281                 break;
1282         case CS6:
1283                 bits |= BITS_DATA_6;
1284                 break;
1285         case CS7:
1286                 bits |= BITS_DATA_7;
1287                 break;
1288         case CS8:
1289         default:
1290                 bits |= BITS_DATA_8;
1291                 break;
1292         }
1293
1294         if (C_PARENB(tty)) {
1295                 if (C_CMSPAR(tty)) {
1296                         if (C_PARODD(tty))
1297                                 bits |= BITS_PARITY_MARK;
1298                         else
1299                                 bits |= BITS_PARITY_SPACE;
1300                 } else {
1301                         if (C_PARODD(tty))
1302                                 bits |= BITS_PARITY_ODD;
1303                         else
1304                                 bits |= BITS_PARITY_EVEN;
1305                 }
1306         }
1307
1308         if (C_CSTOPB(tty))
1309                 bits |= BITS_STOP_2;
1310         else
1311                 bits |= BITS_STOP_1;
1312
1313         ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1314         if (ret)
1315                 dev_err(&port->dev, "failed to set line control: %d\n", ret);
1316
1317         cp210x_set_flow_control(tty, port, old_termios);
1318
1319         /*
1320          * Enable event-insertion mode only if input parity checking is
1321          * enabled for now.
1322          */
1323         if (I_INPCK(tty))
1324                 cp210x_enable_event_mode(port);
1325         else
1326                 cp210x_disable_event_mode(port);
1327 }
1328
1329 static int cp210x_tiocmset(struct tty_struct *tty,
1330                 unsigned int set, unsigned int clear)
1331 {
1332         struct usb_serial_port *port = tty->driver_data;
1333         return cp210x_tiocmset_port(port, set, clear);
1334 }
1335
1336 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1337                 unsigned int set, unsigned int clear)
1338 {
1339         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1340         struct cp210x_flow_ctl flow_ctl;
1341         u32 ctl_hs, flow_repl;
1342         u16 control = 0;
1343         int ret;
1344
1345         mutex_lock(&port_priv->mutex);
1346
1347         if (set & TIOCM_RTS) {
1348                 port_priv->rts = true;
1349                 control |= CONTROL_RTS;
1350                 control |= CONTROL_WRITE_RTS;
1351         }
1352         if (set & TIOCM_DTR) {
1353                 port_priv->dtr = true;
1354                 control |= CONTROL_DTR;
1355                 control |= CONTROL_WRITE_DTR;
1356         }
1357         if (clear & TIOCM_RTS) {
1358                 port_priv->rts = false;
1359                 control &= ~CONTROL_RTS;
1360                 control |= CONTROL_WRITE_RTS;
1361         }
1362         if (clear & TIOCM_DTR) {
1363                 port_priv->dtr = false;
1364                 control &= ~CONTROL_DTR;
1365                 control |= CONTROL_WRITE_DTR;
1366         }
1367
1368         /*
1369          * Use SET_FLOW to set DTR and enable/disable auto-RTS when hardware
1370          * flow control is enabled.
1371          */
1372         if (port_priv->crtscts && control & CONTROL_WRITE_RTS) {
1373                 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1374                                 sizeof(flow_ctl));
1375                 if (ret)
1376                         goto out_unlock;
1377
1378                 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1379                 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1380
1381                 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1382                 if (port_priv->dtr)
1383                         ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
1384                 else
1385                         ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
1386
1387                 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1388                 if (port_priv->rts)
1389                         flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
1390                 else
1391                         flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1392
1393                 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1394                 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1395
1396                 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n",
1397                                 __func__, ctl_hs, flow_repl);
1398
1399                 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1400                                 sizeof(flow_ctl));
1401         } else {
1402                 dev_dbg(&port->dev, "%s - control = 0x%04x\n", __func__, control);
1403
1404                 ret = cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1405         }
1406 out_unlock:
1407         mutex_unlock(&port_priv->mutex);
1408
1409         return ret;
1410 }
1411
1412 static void cp210x_dtr_rts(struct usb_serial_port *port, int on)
1413 {
1414         if (on)
1415                 cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0);
1416         else
1417                 cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS);
1418 }
1419
1420 static int cp210x_tiocmget(struct tty_struct *tty)
1421 {
1422         struct usb_serial_port *port = tty->driver_data;
1423         u8 control;
1424         int result;
1425
1426         result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1427         if (result)
1428                 return result;
1429
1430         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1431                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1432                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1433                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1434                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
1435                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
1436
1437         dev_dbg(&port->dev, "%s - control = 0x%02x\n", __func__, control);
1438
1439         return result;
1440 }
1441
1442 static int cp210x_break_ctl(struct tty_struct *tty, int break_state)
1443 {
1444         struct usb_serial_port *port = tty->driver_data;
1445         struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1446         u16 state;
1447
1448         if (priv->partnum == CP210X_PARTNUM_CP2105) {
1449                 if (cp210x_interface_num(port->serial) == 1)
1450                         return -ENOTTY;
1451         }
1452
1453         if (break_state == 0)
1454                 state = BREAK_OFF;
1455         else
1456                 state = BREAK_ON;
1457
1458         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1459                 state == BREAK_OFF ? "off" : "on");
1460
1461         return cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1462 }
1463
1464 #ifdef CONFIG_GPIOLIB
1465 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1466 {
1467         struct usb_serial *serial = gpiochip_get_data(gc);
1468         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1469         u8 req_type;
1470         u16 mask;
1471         int result;
1472         int len;
1473
1474         result = usb_autopm_get_interface(serial->interface);
1475         if (result)
1476                 return result;
1477
1478         switch (priv->partnum) {
1479         case CP210X_PARTNUM_CP2105:
1480                 req_type = REQTYPE_INTERFACE_TO_HOST;
1481                 len = 1;
1482                 break;
1483         case CP210X_PARTNUM_CP2108:
1484                 req_type = REQTYPE_INTERFACE_TO_HOST;
1485                 len = 2;
1486                 break;
1487         default:
1488                 req_type = REQTYPE_DEVICE_TO_HOST;
1489                 len = 1;
1490                 break;
1491         }
1492
1493         mask = 0;
1494         result = cp210x_read_vendor_block(serial, req_type, CP210X_READ_LATCH,
1495                                           &mask, len);
1496
1497         usb_autopm_put_interface(serial->interface);
1498
1499         if (result < 0)
1500                 return result;
1501
1502         le16_to_cpus(&mask);
1503
1504         return !!(mask & BIT(gpio));
1505 }
1506
1507 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1508 {
1509         struct usb_serial *serial = gpiochip_get_data(gc);
1510         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1511         struct cp210x_gpio_write16 buf16;
1512         struct cp210x_gpio_write buf;
1513         u16 mask, state;
1514         u16 wIndex;
1515         int result;
1516
1517         if (value == 1)
1518                 state = BIT(gpio);
1519         else
1520                 state = 0;
1521
1522         mask = BIT(gpio);
1523
1524         result = usb_autopm_get_interface(serial->interface);
1525         if (result)
1526                 goto out;
1527
1528         switch (priv->partnum) {
1529         case CP210X_PARTNUM_CP2105:
1530                 buf.mask = (u8)mask;
1531                 buf.state = (u8)state;
1532                 result = cp210x_write_vendor_block(serial,
1533                                                    REQTYPE_HOST_TO_INTERFACE,
1534                                                    CP210X_WRITE_LATCH, &buf,
1535                                                    sizeof(buf));
1536                 break;
1537         case CP210X_PARTNUM_CP2108:
1538                 buf16.mask = cpu_to_le16(mask);
1539                 buf16.state = cpu_to_le16(state);
1540                 result = cp210x_write_vendor_block(serial,
1541                                                    REQTYPE_HOST_TO_INTERFACE,
1542                                                    CP210X_WRITE_LATCH, &buf16,
1543                                                    sizeof(buf16));
1544                 break;
1545         default:
1546                 wIndex = state << 8 | mask;
1547                 result = usb_control_msg(serial->dev,
1548                                          usb_sndctrlpipe(serial->dev, 0),
1549                                          CP210X_VENDOR_SPECIFIC,
1550                                          REQTYPE_HOST_TO_DEVICE,
1551                                          CP210X_WRITE_LATCH,
1552                                          wIndex,
1553                                          NULL, 0, USB_CTRL_SET_TIMEOUT);
1554                 break;
1555         }
1556
1557         usb_autopm_put_interface(serial->interface);
1558 out:
1559         if (result < 0) {
1560                 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n",
1561                                 result);
1562         }
1563 }
1564
1565 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1566 {
1567         struct usb_serial *serial = gpiochip_get_data(gc);
1568         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1569
1570         return priv->gpio_input & BIT(gpio);
1571 }
1572
1573 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1574 {
1575         struct usb_serial *serial = gpiochip_get_data(gc);
1576         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1577
1578         if (priv->partnum == CP210X_PARTNUM_CP2105) {
1579                 /* hardware does not support an input mode */
1580                 return -ENOTSUPP;
1581         }
1582
1583         /* push-pull pins cannot be changed to be inputs */
1584         if (priv->gpio_pushpull & BIT(gpio))
1585                 return -EINVAL;
1586
1587         /* make sure to release pin if it is being driven low */
1588         cp210x_gpio_set(gc, gpio, 1);
1589
1590         priv->gpio_input |= BIT(gpio);
1591
1592         return 0;
1593 }
1594
1595 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1596                                         int value)
1597 {
1598         struct usb_serial *serial = gpiochip_get_data(gc);
1599         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1600
1601         priv->gpio_input &= ~BIT(gpio);
1602         cp210x_gpio_set(gc, gpio, value);
1603
1604         return 0;
1605 }
1606
1607 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1608                                   unsigned long config)
1609 {
1610         struct usb_serial *serial = gpiochip_get_data(gc);
1611         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1612         enum pin_config_param param = pinconf_to_config_param(config);
1613
1614         /* Succeed only if in correct mode (this can't be set at runtime) */
1615         if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1616             (priv->gpio_pushpull & BIT(gpio)))
1617                 return 0;
1618
1619         if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1620             !(priv->gpio_pushpull & BIT(gpio)))
1621                 return 0;
1622
1623         return -ENOTSUPP;
1624 }
1625
1626 static int cp210x_gpio_init_valid_mask(struct gpio_chip *gc,
1627                 unsigned long *valid_mask, unsigned int ngpios)
1628 {
1629         struct usb_serial *serial = gpiochip_get_data(gc);
1630         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1631         struct device *dev = &serial->interface->dev;
1632         unsigned long altfunc_mask = priv->gpio_altfunc;
1633
1634         bitmap_complement(valid_mask, &altfunc_mask, ngpios);
1635
1636         if (bitmap_empty(valid_mask, ngpios))
1637                 dev_dbg(dev, "no pin configured for GPIO\n");
1638         else
1639                 dev_dbg(dev, "GPIO.%*pbl configured for GPIO\n", ngpios,
1640                                 valid_mask);
1641         return 0;
1642 }
1643
1644 /*
1645  * This function is for configuring GPIO using shared pins, where other signals
1646  * are made unavailable by configuring the use of GPIO. This is believed to be
1647  * only applicable to the cp2105 at this point, the other devices supported by
1648  * this driver that provide GPIO do so in a way that does not impact other
1649  * signals and are thus expected to have very different initialisation.
1650  */
1651 static int cp2105_gpioconf_init(struct usb_serial *serial)
1652 {
1653         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1654         struct cp210x_pin_mode mode;
1655         struct cp210x_dual_port_config config;
1656         u8 intf_num = cp210x_interface_num(serial);
1657         u8 iface_config;
1658         int result;
1659
1660         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1661                                           CP210X_GET_DEVICEMODE, &mode,
1662                                           sizeof(mode));
1663         if (result < 0)
1664                 return result;
1665
1666         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1667                                           CP210X_GET_PORTCONFIG, &config,
1668                                           sizeof(config));
1669         if (result < 0)
1670                 return result;
1671
1672         /*  2 banks of GPIO - One for the pins taken from each serial port */
1673         if (intf_num == 0) {
1674                 priv->gc.ngpio = 2;
1675
1676                 if (mode.eci == CP210X_PIN_MODE_MODEM) {
1677                         /* mark all GPIOs of this interface as reserved */
1678                         priv->gpio_altfunc = 0xff;
1679                         return 0;
1680                 }
1681
1682                 iface_config = config.eci_cfg;
1683                 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1684                                                 CP210X_ECI_GPIO_MODE_MASK) >>
1685                                                 CP210X_ECI_GPIO_MODE_OFFSET);
1686         } else if (intf_num == 1) {
1687                 priv->gc.ngpio = 3;
1688
1689                 if (mode.sci == CP210X_PIN_MODE_MODEM) {
1690                         /* mark all GPIOs of this interface as reserved */
1691                         priv->gpio_altfunc = 0xff;
1692                         return 0;
1693                 }
1694
1695                 iface_config = config.sci_cfg;
1696                 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1697                                                 CP210X_SCI_GPIO_MODE_MASK) >>
1698                                                 CP210X_SCI_GPIO_MODE_OFFSET);
1699         } else {
1700                 return -ENODEV;
1701         }
1702
1703         /* mark all pins which are not in GPIO mode */
1704         if (iface_config & CP2105_GPIO0_TXLED_MODE)     /* GPIO 0 */
1705                 priv->gpio_altfunc |= BIT(0);
1706         if (iface_config & (CP2105_GPIO1_RXLED_MODE |   /* GPIO 1 */
1707                         CP2105_GPIO1_RS485_MODE))
1708                 priv->gpio_altfunc |= BIT(1);
1709
1710         /* driver implementation for CP2105 only supports outputs */
1711         priv->gpio_input = 0;
1712
1713         return 0;
1714 }
1715
1716 static int cp2104_gpioconf_init(struct usb_serial *serial)
1717 {
1718         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1719         struct cp210x_single_port_config config;
1720         u8 iface_config;
1721         u8 gpio_latch;
1722         int result;
1723         u8 i;
1724
1725         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1726                                           CP210X_GET_PORTCONFIG, &config,
1727                                           sizeof(config));
1728         if (result < 0)
1729                 return result;
1730
1731         priv->gc.ngpio = 4;
1732
1733         iface_config = config.device_cfg;
1734         priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1735                                         CP210X_GPIO_MODE_MASK) >>
1736                                         CP210X_GPIO_MODE_OFFSET);
1737         gpio_latch = (u8)((le16_to_cpu(config.reset_state) &
1738                                         CP210X_GPIO_MODE_MASK) >>
1739                                         CP210X_GPIO_MODE_OFFSET);
1740
1741         /* mark all pins which are not in GPIO mode */
1742         if (iface_config & CP2104_GPIO0_TXLED_MODE)     /* GPIO 0 */
1743                 priv->gpio_altfunc |= BIT(0);
1744         if (iface_config & CP2104_GPIO1_RXLED_MODE)     /* GPIO 1 */
1745                 priv->gpio_altfunc |= BIT(1);
1746         if (iface_config & CP2104_GPIO2_RS485_MODE)     /* GPIO 2 */
1747                 priv->gpio_altfunc |= BIT(2);
1748
1749         /*
1750          * Like CP2102N, CP2104 has also no strict input and output pin
1751          * modes.
1752          * Do the same input mode emulation as CP2102N.
1753          */
1754         for (i = 0; i < priv->gc.ngpio; ++i) {
1755                 /*
1756                  * Set direction to "input" iff pin is open-drain and reset
1757                  * value is 1.
1758                  */
1759                 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1760                         priv->gpio_input |= BIT(i);
1761         }
1762
1763         return 0;
1764 }
1765
1766 static int cp2108_gpio_init(struct usb_serial *serial)
1767 {
1768         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1769         struct cp210x_quad_port_config config;
1770         u16 gpio_latch;
1771         int result;
1772         u8 i;
1773
1774         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1775                                           CP210X_GET_PORTCONFIG, &config,
1776                                           sizeof(config));
1777         if (result < 0)
1778                 return result;
1779
1780         priv->gc.ngpio = 16;
1781         priv->gpio_pushpull = le16_to_cpu(config.reset_state.gpio_mode_pb1);
1782         gpio_latch = le16_to_cpu(config.reset_state.gpio_latch_pb1);
1783
1784         /*
1785          * Mark all pins which are not in GPIO mode.
1786          *
1787          * Refer to table 9.1 "GPIO Mode alternate Functions" in the datasheet:
1788          * https://www.silabs.com/documents/public/data-sheets/cp2108-datasheet.pdf
1789          *
1790          * Alternate functions of GPIO0 to GPIO3 are determine by enhancedfxn_ifc[0]
1791          * and the similarly for the other pins; enhancedfxn_ifc[1]: GPIO4 to GPIO7,
1792          * enhancedfxn_ifc[2]: GPIO8 to GPIO11, enhancedfxn_ifc[3]: GPIO12 to GPIO15.
1793          */
1794         for (i = 0; i < 4; i++) {
1795                 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_TXLED)
1796                         priv->gpio_altfunc |= BIT(i * 4);
1797                 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RXLED)
1798                         priv->gpio_altfunc |= BIT((i * 4) + 1);
1799                 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RS485)
1800                         priv->gpio_altfunc |= BIT((i * 4) + 2);
1801                 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_CLOCK)
1802                         priv->gpio_altfunc |= BIT((i * 4) + 3);
1803         }
1804
1805         /*
1806          * Like CP2102N, CP2108 has also no strict input and output pin
1807          * modes. Do the same input mode emulation as CP2102N.
1808          */
1809         for (i = 0; i < priv->gc.ngpio; ++i) {
1810                 /*
1811                  * Set direction to "input" iff pin is open-drain and reset
1812                  * value is 1.
1813                  */
1814                 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1815                         priv->gpio_input |= BIT(i);
1816         }
1817
1818         return 0;
1819 }
1820
1821 static int cp2102n_gpioconf_init(struct usb_serial *serial)
1822 {
1823         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1824         const u16 config_size = 0x02a6;
1825         u8 gpio_rst_latch;
1826         u8 config_version;
1827         u8 gpio_pushpull;
1828         u8 *config_buf;
1829         u8 gpio_latch;
1830         u8 gpio_ctrl;
1831         int result;
1832         u8 i;
1833
1834         /*
1835          * Retrieve device configuration from the device.
1836          * The array received contains all customization settings done at the
1837          * factory/manufacturer. Format of the array is documented at the
1838          * time of writing at:
1839          * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa
1840          */
1841         config_buf = kmalloc(config_size, GFP_KERNEL);
1842         if (!config_buf)
1843                 return -ENOMEM;
1844
1845         result = cp210x_read_vendor_block(serial,
1846                                           REQTYPE_DEVICE_TO_HOST,
1847                                           CP210X_READ_2NCONFIG,
1848                                           config_buf,
1849                                           config_size);
1850         if (result < 0) {
1851                 kfree(config_buf);
1852                 return result;
1853         }
1854
1855         config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX];
1856         gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX];
1857         gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX];
1858         gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX];
1859
1860         kfree(config_buf);
1861
1862         /* Make sure this is a config format we understand. */
1863         if (config_version != 0x01)
1864                 return -ENOTSUPP;
1865
1866         priv->gc.ngpio = 4;
1867
1868         /*
1869          * Get default pin states after reset. Needed so we can determine
1870          * the direction of an open-drain pin.
1871          */
1872         gpio_latch = (gpio_rst_latch >> 3) & 0x0f;
1873
1874         /* 0 indicates open-drain mode, 1 is push-pull */
1875         priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f;
1876
1877         /* 0 indicates GPIO mode, 1 is alternate function */
1878         if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) {
1879                 /* QFN20 is special... */
1880                 if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE)   /* GPIO 0 */
1881                         priv->gpio_altfunc |= BIT(0);
1882                 if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */
1883                         priv->gpio_altfunc |= BIT(1);
1884                 if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */
1885                         priv->gpio_altfunc |= BIT(2);
1886                 if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */
1887                         priv->gpio_altfunc |= BIT(3);
1888         } else {
1889                 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f;
1890         }
1891
1892         if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) {
1893                 /*
1894                  * For the QFN28 package, GPIO4-6 are controlled by
1895                  * the low three bits of the mode/latch fields.
1896                  * Contrary to the document linked above, the bits for
1897                  * the SUSPEND pins are elsewhere.  No alternate
1898                  * function is available for these pins.
1899                  */
1900                 priv->gc.ngpio = 7;
1901                 gpio_latch |= (gpio_rst_latch & 7) << 4;
1902                 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4;
1903         }
1904
1905         /*
1906          * The CP2102N does not strictly has input and output pin modes,
1907          * it only knows open-drain and push-pull modes which is set at
1908          * factory. An open-drain pin can function both as an
1909          * input or an output. We emulate input mode for open-drain pins
1910          * by making sure they are not driven low, and we do not allow
1911          * push-pull pins to be set as an input.
1912          */
1913         for (i = 0; i < priv->gc.ngpio; ++i) {
1914                 /*
1915                  * Set direction to "input" iff pin is open-drain and reset
1916                  * value is 1.
1917                  */
1918                 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1919                         priv->gpio_input |= BIT(i);
1920         }
1921
1922         return 0;
1923 }
1924
1925 static int cp210x_gpio_init(struct usb_serial *serial)
1926 {
1927         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1928         int result;
1929
1930         switch (priv->partnum) {
1931         case CP210X_PARTNUM_CP2104:
1932                 result = cp2104_gpioconf_init(serial);
1933                 break;
1934         case CP210X_PARTNUM_CP2105:
1935                 result = cp2105_gpioconf_init(serial);
1936                 break;
1937         case CP210X_PARTNUM_CP2108:
1938                 /*
1939                  * The GPIOs are not tied to any specific port so only register
1940                  * once for interface 0.
1941                  */
1942                 if (cp210x_interface_num(serial) != 0)
1943                         return 0;
1944                 result = cp2108_gpio_init(serial);
1945                 break;
1946         case CP210X_PARTNUM_CP2102N_QFN28:
1947         case CP210X_PARTNUM_CP2102N_QFN24:
1948         case CP210X_PARTNUM_CP2102N_QFN20:
1949                 result = cp2102n_gpioconf_init(serial);
1950                 break;
1951         default:
1952                 return 0;
1953         }
1954
1955         if (result < 0)
1956                 return result;
1957
1958         priv->gc.label = "cp210x";
1959         priv->gc.get_direction = cp210x_gpio_direction_get;
1960         priv->gc.direction_input = cp210x_gpio_direction_input;
1961         priv->gc.direction_output = cp210x_gpio_direction_output;
1962         priv->gc.get = cp210x_gpio_get;
1963         priv->gc.set = cp210x_gpio_set;
1964         priv->gc.set_config = cp210x_gpio_set_config;
1965         priv->gc.init_valid_mask = cp210x_gpio_init_valid_mask;
1966         priv->gc.owner = THIS_MODULE;
1967         priv->gc.parent = &serial->interface->dev;
1968         priv->gc.base = -1;
1969         priv->gc.can_sleep = true;
1970
1971         result = gpiochip_add_data(&priv->gc, serial);
1972         if (!result)
1973                 priv->gpio_registered = true;
1974
1975         return result;
1976 }
1977
1978 static void cp210x_gpio_remove(struct usb_serial *serial)
1979 {
1980         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1981
1982         if (priv->gpio_registered) {
1983                 gpiochip_remove(&priv->gc);
1984                 priv->gpio_registered = false;
1985         }
1986 }
1987
1988 #else
1989
1990 static int cp210x_gpio_init(struct usb_serial *serial)
1991 {
1992         return 0;
1993 }
1994
1995 static void cp210x_gpio_remove(struct usb_serial *serial)
1996 {
1997         /* Nothing to do */
1998 }
1999
2000 #endif
2001
2002 static int cp210x_port_probe(struct usb_serial_port *port)
2003 {
2004         struct usb_serial *serial = port->serial;
2005         struct cp210x_port_private *port_priv;
2006
2007         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
2008         if (!port_priv)
2009                 return -ENOMEM;
2010
2011         port_priv->bInterfaceNumber = cp210x_interface_num(serial);
2012         mutex_init(&port_priv->mutex);
2013
2014         usb_set_serial_port_data(port, port_priv);
2015
2016         return 0;
2017 }
2018
2019 static void cp210x_port_remove(struct usb_serial_port *port)
2020 {
2021         struct cp210x_port_private *port_priv;
2022
2023         port_priv = usb_get_serial_port_data(port);
2024         kfree(port_priv);
2025 }
2026
2027 static void cp210x_init_max_speed(struct usb_serial *serial)
2028 {
2029         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2030         bool use_actual_rate = false;
2031         speed_t min = 300;
2032         speed_t max;
2033
2034         switch (priv->partnum) {
2035         case CP210X_PARTNUM_CP2101:
2036                 max = 921600;
2037                 break;
2038         case CP210X_PARTNUM_CP2102:
2039         case CP210X_PARTNUM_CP2103:
2040                 max = 1000000;
2041                 break;
2042         case CP210X_PARTNUM_CP2104:
2043                 use_actual_rate = true;
2044                 max = 2000000;
2045                 break;
2046         case CP210X_PARTNUM_CP2108:
2047                 max = 2000000;
2048                 break;
2049         case CP210X_PARTNUM_CP2105:
2050                 if (cp210x_interface_num(serial) == 0) {
2051                         use_actual_rate = true;
2052                         max = 2000000;  /* ECI */
2053                 } else {
2054                         min = 2400;
2055                         max = 921600;   /* SCI */
2056                 }
2057                 break;
2058         case CP210X_PARTNUM_CP2102N_QFN28:
2059         case CP210X_PARTNUM_CP2102N_QFN24:
2060         case CP210X_PARTNUM_CP2102N_QFN20:
2061                 use_actual_rate = true;
2062                 max = 3000000;
2063                 break;
2064         default:
2065                 max = 2000000;
2066                 break;
2067         }
2068
2069         priv->min_speed = min;
2070         priv->max_speed = max;
2071         priv->use_actual_rate = use_actual_rate;
2072 }
2073
2074 static void cp2102_determine_quirks(struct usb_serial *serial)
2075 {
2076         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2077         u8 *buf;
2078         int ret;
2079
2080         buf = kmalloc(2, GFP_KERNEL);
2081         if (!buf)
2082                 return;
2083         /*
2084          * Some (possibly counterfeit) CP2102 do not support event-insertion
2085          * mode and respond differently to malformed vendor requests.
2086          * Specifically, they return one instead of two bytes when sent a
2087          * two-byte part-number request.
2088          */
2089         ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2090                         CP210X_VENDOR_SPECIFIC, REQTYPE_DEVICE_TO_HOST,
2091                         CP210X_GET_PARTNUM, 0, buf, 2, USB_CTRL_GET_TIMEOUT);
2092         if (ret == 1) {
2093                 dev_dbg(&serial->interface->dev,
2094                                 "device does not support event-insertion mode\n");
2095                 priv->no_event_mode = true;
2096         }
2097
2098         kfree(buf);
2099 }
2100
2101 static int cp210x_get_fw_version(struct usb_serial *serial, u16 value)
2102 {
2103         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2104         u8 ver[3];
2105         int ret;
2106
2107         ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, value,
2108                         ver, sizeof(ver));
2109         if (ret)
2110                 return ret;
2111
2112         dev_dbg(&serial->interface->dev, "%s - %d.%d.%d\n", __func__,
2113                         ver[0], ver[1], ver[2]);
2114
2115         priv->fw_version = ver[0] << 16 | ver[1] << 8 | ver[2];
2116
2117         return 0;
2118 }
2119
2120 static void cp210x_determine_type(struct usb_serial *serial)
2121 {
2122         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2123         int ret;
2124
2125         ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
2126                         CP210X_GET_PARTNUM, &priv->partnum,
2127                         sizeof(priv->partnum));
2128         if (ret < 0) {
2129                 dev_warn(&serial->interface->dev,
2130                                 "querying part number failed\n");
2131                 priv->partnum = CP210X_PARTNUM_UNKNOWN;
2132                 return;
2133         }
2134
2135         dev_dbg(&serial->interface->dev, "partnum = 0x%02x\n", priv->partnum);
2136
2137         switch (priv->partnum) {
2138         case CP210X_PARTNUM_CP2102:
2139                 cp2102_determine_quirks(serial);
2140                 break;
2141         case CP210X_PARTNUM_CP2105:
2142         case CP210X_PARTNUM_CP2108:
2143                 cp210x_get_fw_version(serial, CP210X_GET_FW_VER);
2144                 break;
2145         case CP210X_PARTNUM_CP2102N_QFN28:
2146         case CP210X_PARTNUM_CP2102N_QFN24:
2147         case CP210X_PARTNUM_CP2102N_QFN20:
2148                 ret = cp210x_get_fw_version(serial, CP210X_GET_FW_VER_2N);
2149                 if (ret)
2150                         break;
2151                 if (priv->fw_version <= 0x10004)
2152                         priv->no_flow_control = true;
2153                 break;
2154         default:
2155                 break;
2156         }
2157 }
2158
2159 static int cp210x_attach(struct usb_serial *serial)
2160 {
2161         int result;
2162         struct cp210x_serial_private *priv;
2163
2164         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2165         if (!priv)
2166                 return -ENOMEM;
2167
2168         usb_set_serial_data(serial, priv);
2169
2170         cp210x_determine_type(serial);
2171         cp210x_init_max_speed(serial);
2172
2173         result = cp210x_gpio_init(serial);
2174         if (result < 0) {
2175                 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n",
2176                                 result);
2177         }
2178
2179         return 0;
2180 }
2181
2182 static void cp210x_disconnect(struct usb_serial *serial)
2183 {
2184         cp210x_gpio_remove(serial);
2185 }
2186
2187 static void cp210x_release(struct usb_serial *serial)
2188 {
2189         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2190
2191         cp210x_gpio_remove(serial);
2192
2193         kfree(priv);
2194 }
2195
2196 module_usb_serial_driver(serial_drivers, id_table);
2197
2198 MODULE_DESCRIPTION(DRIVER_DESC);
2199 MODULE_LICENSE("GPL v2");