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Diffstat (limited to '')
| -rw-r--r-- | drivers/usb/serial/cp210x.c | 2195 |
1 files changed, 2195 insertions, 0 deletions
diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c new file mode 100644 index 000000000..045e24174 --- /dev/null +++ b/drivers/usb/serial/cp210x.c @@ -0,0 +1,2195 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Silicon Laboratories CP210x USB to RS232 serial adaptor driver + * + * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk) + * + * Support to set flow control line levels using TIOCMGET and TIOCMSET + * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow + * control thanks to Munir Nassar nassarmu@real-time.com + * + */ + +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/slab.h> +#include <linux/tty.h> +#include <linux/tty_flip.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/usb.h> +#include <linux/uaccess.h> +#include <linux/usb/serial.h> +#include <linux/gpio/driver.h> +#include <linux/bitops.h> +#include <linux/mutex.h> + +#define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver" + +/* + * Function Prototypes + */ +static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *); +static void cp210x_close(struct usb_serial_port *); +static void cp210x_get_termios(struct tty_struct *, struct usb_serial_port *); +static void cp210x_get_termios_port(struct usb_serial_port *port, + tcflag_t *cflagp, unsigned int *baudp); +static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *, + struct ktermios *); +static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *, + struct ktermios*); +static bool cp210x_tx_empty(struct usb_serial_port *port); +static int cp210x_tiocmget(struct tty_struct *); +static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int); +static int cp210x_tiocmset_port(struct usb_serial_port *port, + unsigned int, unsigned int); +static void cp210x_break_ctl(struct tty_struct *, int); +static int cp210x_attach(struct usb_serial *); +static void cp210x_disconnect(struct usb_serial *); +static void cp210x_release(struct usb_serial *); +static int cp210x_port_probe(struct usb_serial_port *); +static int cp210x_port_remove(struct usb_serial_port *); +static void cp210x_dtr_rts(struct usb_serial_port *p, int on); +static void cp210x_process_read_urb(struct urb *urb); +static void cp210x_enable_event_mode(struct usb_serial_port *port); +static void cp210x_disable_event_mode(struct usb_serial_port *port); + +static const struct usb_device_id id_table[] = { + { USB_DEVICE(0x0404, 0x034C) }, /* NCR Retail IO Box */ + { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */ + { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */ + { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ + { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ + { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */ + { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */ + { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */ + { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */ + { USB_DEVICE(0x0908, 0x0070) }, /* Siemens SCALANCE LPE-9000 USB Serial Console */ + { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */ + { USB_DEVICE(0x0988, 0x0578) }, /* Teraoka AD2000 */ + { USB_DEVICE(0x0B00, 0x3070) }, /* Ingenico 3070 */ + { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */ + { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */ + { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */ + { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */ + { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */ + { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */ + { USB_DEVICE(0x106F, 0x0003) }, /* CPI / Money Controls Bulk Coin Recycler */ + { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */ + { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */ + { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */ + { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */ + { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */ + { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */ + { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */ + { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */ + { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */ + { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */ + { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */ + { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */ + { USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */ + { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */ + { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */ + { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */ + { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */ + { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */ + { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */ + { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */ + { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */ + { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */ + { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */ + { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */ + { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */ + { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */ + { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */ + { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */ + { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */ + { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */ + { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */ + { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */ + { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */ + { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */ + { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */ + { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */ + { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */ + { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */ + { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */ + { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */ + { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */ + { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */ + { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */ + { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */ + { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */ + { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */ + { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */ + { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */ + { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */ + { USB_DEVICE(0x10C4, 0x82AA) }, /* Silicon Labs IFS-USB-DATACABLE used with Quint UPS */ + { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */ + { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */ + { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */ + { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */ + { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */ + { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */ + { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */ + { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */ + { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */ + { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */ + { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ + { USB_DEVICE(0x10C4, 0x8414) }, /* Decagon USB Cable Adapter */ + { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ + { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ + { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */ + { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ + { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */ + { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */ + { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */ + { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */ + { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ + { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ + { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */ + { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ + { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ + { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */ + { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */ + { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */ + { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */ + { USB_DEVICE(0x10C4, 0x88D8) }, /* Acuity Brands nLight Air Adapter */ + { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */ + { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */ + { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */ + { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */ + { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */ + { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */ + { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */ + { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */ + { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */ + { USB_DEVICE(0x10C4, 0x8A5B) }, /* CEL EM3588 ZigBee USB Stick */ + { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */ + { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */ + { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ + { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ + { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */ + { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ + { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ + { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */ + { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */ + { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ + { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ + { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ + { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ + { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ + { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ + { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */ + { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */ + { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ + { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ + { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */ + { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */ + { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */ + { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ + { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */ + { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */ + { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */ + { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */ + { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */ + { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */ + { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ + { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ + { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ + { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ + { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ + { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ + { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ + { USB_DEVICE(0x17A8, 0x0011) }, /* Kamstrup 444 MHz RF sniffer */ + { USB_DEVICE(0x17A8, 0x0013) }, /* Kamstrup 870 MHz RF sniffer */ + { USB_DEVICE(0x17A8, 0x0101) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Int Ant) */ + { USB_DEVICE(0x17A8, 0x0102) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Ext Ant) */ + { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ + { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ + { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ + { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */ + { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */ + { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */ + { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */ + { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */ + { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */ + { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */ + { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */ + { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 M.2 Key E serial interface */ + { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 Display serial interface */ + { USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */ + { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */ + { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */ + { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */ + { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */ + { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ + { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */ + { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ + { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ + { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ + { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ + { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ + { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ + { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ + { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ + { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ + { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ + { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ + { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ + { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ + { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ + { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ + { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ + { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ + { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ + { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ + { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ + { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ + { USB_DEVICE(0x2184, 0x0030) }, /* GW Instek GDM-834x Digital Multimeter */ + { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */ + { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ + { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ + { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ + { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */ + { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ + { } /* Terminating Entry */ +}; + +MODULE_DEVICE_TABLE(usb, id_table); + +struct cp210x_serial_private { +#ifdef CONFIG_GPIOLIB + struct gpio_chip gc; + bool gpio_registered; + u8 gpio_pushpull; + u8 gpio_altfunc; + u8 gpio_input; +#endif + u8 partnum; + speed_t min_speed; + speed_t max_speed; + bool use_actual_rate; + bool no_event_mode; +}; + +enum cp210x_event_state { + ES_DATA, + ES_ESCAPE, + ES_LSR, + ES_LSR_DATA_0, + ES_LSR_DATA_1, + ES_MSR +}; + +struct cp210x_port_private { + u8 bInterfaceNumber; + bool has_swapped_line_ctl; + bool event_mode; + enum cp210x_event_state event_state; + u8 lsr; +}; + +static struct usb_serial_driver cp210x_device = { + .driver = { + .owner = THIS_MODULE, + .name = "cp210x", + }, + .id_table = id_table, + .num_ports = 1, + .bulk_in_size = 256, + .bulk_out_size = 256, + .open = cp210x_open, + .close = cp210x_close, + .break_ctl = cp210x_break_ctl, + .set_termios = cp210x_set_termios, + .tx_empty = cp210x_tx_empty, + .throttle = usb_serial_generic_throttle, + .unthrottle = usb_serial_generic_unthrottle, + .tiocmget = cp210x_tiocmget, + .tiocmset = cp210x_tiocmset, + .get_icount = usb_serial_generic_get_icount, + .attach = cp210x_attach, + .disconnect = cp210x_disconnect, + .release = cp210x_release, + .port_probe = cp210x_port_probe, + .port_remove = cp210x_port_remove, + .dtr_rts = cp210x_dtr_rts, + .process_read_urb = cp210x_process_read_urb, +}; + +static struct usb_serial_driver * const serial_drivers[] = { + &cp210x_device, NULL +}; + +/* Config request types */ +#define REQTYPE_HOST_TO_INTERFACE 0x41 +#define REQTYPE_INTERFACE_TO_HOST 0xc1 +#define REQTYPE_HOST_TO_DEVICE 0x40 +#define REQTYPE_DEVICE_TO_HOST 0xc0 + +/* Config request codes */ +#define CP210X_IFC_ENABLE 0x00 +#define CP210X_SET_BAUDDIV 0x01 +#define CP210X_GET_BAUDDIV 0x02 +#define CP210X_SET_LINE_CTL 0x03 +#define CP210X_GET_LINE_CTL 0x04 +#define CP210X_SET_BREAK 0x05 +#define CP210X_IMM_CHAR 0x06 +#define CP210X_SET_MHS 0x07 +#define CP210X_GET_MDMSTS 0x08 +#define CP210X_SET_XON 0x09 +#define CP210X_SET_XOFF 0x0A +#define CP210X_SET_EVENTMASK 0x0B +#define CP210X_GET_EVENTMASK 0x0C +#define CP210X_SET_CHAR 0x0D +#define CP210X_GET_CHARS 0x0E +#define CP210X_GET_PROPS 0x0F +#define CP210X_GET_COMM_STATUS 0x10 +#define CP210X_RESET 0x11 +#define CP210X_PURGE 0x12 +#define CP210X_SET_FLOW 0x13 +#define CP210X_GET_FLOW 0x14 +#define CP210X_EMBED_EVENTS 0x15 +#define CP210X_GET_EVENTSTATE 0x16 +#define CP210X_SET_CHARS 0x19 +#define CP210X_GET_BAUDRATE 0x1D +#define CP210X_SET_BAUDRATE 0x1E +#define CP210X_VENDOR_SPECIFIC 0xFF + +/* CP210X_IFC_ENABLE */ +#define UART_ENABLE 0x0001 +#define UART_DISABLE 0x0000 + +/* CP210X_(SET|GET)_BAUDDIV */ +#define BAUD_RATE_GEN_FREQ 0x384000 + +/* CP210X_(SET|GET)_LINE_CTL */ +#define BITS_DATA_MASK 0X0f00 +#define BITS_DATA_5 0X0500 +#define BITS_DATA_6 0X0600 +#define BITS_DATA_7 0X0700 +#define BITS_DATA_8 0X0800 +#define BITS_DATA_9 0X0900 + +#define BITS_PARITY_MASK 0x00f0 +#define BITS_PARITY_NONE 0x0000 +#define BITS_PARITY_ODD 0x0010 +#define BITS_PARITY_EVEN 0x0020 +#define BITS_PARITY_MARK 0x0030 +#define BITS_PARITY_SPACE 0x0040 + +#define BITS_STOP_MASK 0x000f +#define BITS_STOP_1 0x0000 +#define BITS_STOP_1_5 0x0001 +#define BITS_STOP_2 0x0002 + +/* CP210X_SET_BREAK */ +#define BREAK_ON 0x0001 +#define BREAK_OFF 0x0000 + +/* CP210X_(SET_MHS|GET_MDMSTS) */ +#define CONTROL_DTR 0x0001 +#define CONTROL_RTS 0x0002 +#define CONTROL_CTS 0x0010 +#define CONTROL_DSR 0x0020 +#define CONTROL_RING 0x0040 +#define CONTROL_DCD 0x0080 +#define CONTROL_WRITE_DTR 0x0100 +#define CONTROL_WRITE_RTS 0x0200 + +/* CP210X_VENDOR_SPECIFIC values */ +#define CP210X_READ_2NCONFIG 0x000E +#define CP210X_READ_LATCH 0x00C2 +#define CP210X_GET_PARTNUM 0x370B +#define CP210X_GET_PORTCONFIG 0x370C +#define CP210X_GET_DEVICEMODE 0x3711 +#define CP210X_WRITE_LATCH 0x37E1 + +/* Part number definitions */ +#define CP210X_PARTNUM_CP2101 0x01 +#define CP210X_PARTNUM_CP2102 0x02 +#define CP210X_PARTNUM_CP2103 0x03 +#define CP210X_PARTNUM_CP2104 0x04 +#define CP210X_PARTNUM_CP2105 0x05 +#define CP210X_PARTNUM_CP2108 0x08 +#define CP210X_PARTNUM_CP2102N_QFN28 0x20 +#define CP210X_PARTNUM_CP2102N_QFN24 0x21 +#define CP210X_PARTNUM_CP2102N_QFN20 0x22 +#define CP210X_PARTNUM_UNKNOWN 0xFF + +/* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ +struct cp210x_comm_status { + __le32 ulErrors; + __le32 ulHoldReasons; + __le32 ulAmountInInQueue; + __le32 ulAmountInOutQueue; + u8 bEofReceived; + u8 bWaitForImmediate; + u8 bReserved; +} __packed; + +/* + * CP210X_PURGE - 16 bits passed in wValue of USB request. + * SiLabs app note AN571 gives a strange description of the 4 bits: + * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. + * writing 1 to all, however, purges cp2108 well enough to avoid the hang. + */ +#define PURGE_ALL 0x000f + +/* CP210X_EMBED_EVENTS */ +#define CP210X_ESCCHAR 0xec + +#define CP210X_LSR_OVERRUN BIT(1) +#define CP210X_LSR_PARITY BIT(2) +#define CP210X_LSR_FRAME BIT(3) +#define CP210X_LSR_BREAK BIT(4) + + +/* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */ +struct cp210x_flow_ctl { + __le32 ulControlHandshake; + __le32 ulFlowReplace; + __le32 ulXonLimit; + __le32 ulXoffLimit; +}; + +/* cp210x_flow_ctl::ulControlHandshake */ +#define CP210X_SERIAL_DTR_MASK GENMASK(1, 0) +#define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode) +#define CP210X_SERIAL_CTS_HANDSHAKE BIT(3) +#define CP210X_SERIAL_DSR_HANDSHAKE BIT(4) +#define CP210X_SERIAL_DCD_HANDSHAKE BIT(5) +#define CP210X_SERIAL_DSR_SENSITIVITY BIT(6) + +/* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */ +#define CP210X_SERIAL_DTR_INACTIVE 0 +#define CP210X_SERIAL_DTR_ACTIVE 1 +#define CP210X_SERIAL_DTR_FLOW_CTL 2 + +/* cp210x_flow_ctl::ulFlowReplace */ +#define CP210X_SERIAL_AUTO_TRANSMIT BIT(0) +#define CP210X_SERIAL_AUTO_RECEIVE BIT(1) +#define CP210X_SERIAL_ERROR_CHAR BIT(2) +#define CP210X_SERIAL_NULL_STRIPPING BIT(3) +#define CP210X_SERIAL_BREAK_CHAR BIT(4) +#define CP210X_SERIAL_RTS_MASK GENMASK(7, 6) +#define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6) +#define CP210X_SERIAL_XOFF_CONTINUE BIT(31) + +/* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */ +#define CP210X_SERIAL_RTS_INACTIVE 0 +#define CP210X_SERIAL_RTS_ACTIVE 1 +#define CP210X_SERIAL_RTS_FLOW_CTL 2 + +/* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */ +struct cp210x_pin_mode { + u8 eci; + u8 sci; +}; + +#define CP210X_PIN_MODE_MODEM 0 +#define CP210X_PIN_MODE_GPIO BIT(0) + +/* + * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes + * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes. + */ +struct cp210x_dual_port_config { + __le16 gpio_mode; + u8 __pad0[2]; + __le16 reset_state; + u8 __pad1[4]; + __le16 suspend_state; + u8 sci_cfg; + u8 eci_cfg; + u8 device_cfg; +} __packed; + +/* + * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes + * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes. + */ +struct cp210x_single_port_config { + __le16 gpio_mode; + u8 __pad0[2]; + __le16 reset_state; + u8 __pad1[4]; + __le16 suspend_state; + u8 device_cfg; +} __packed; + +/* GPIO modes */ +#define CP210X_SCI_GPIO_MODE_OFFSET 9 +#define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9) + +#define CP210X_ECI_GPIO_MODE_OFFSET 2 +#define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2) + +#define CP210X_GPIO_MODE_OFFSET 8 +#define CP210X_GPIO_MODE_MASK GENMASK(11, 8) + +/* CP2105 port configuration values */ +#define CP2105_GPIO0_TXLED_MODE BIT(0) +#define CP2105_GPIO1_RXLED_MODE BIT(1) +#define CP2105_GPIO1_RS485_MODE BIT(2) + +/* CP2104 port configuration values */ +#define CP2104_GPIO0_TXLED_MODE BIT(0) +#define CP2104_GPIO1_RXLED_MODE BIT(1) +#define CP2104_GPIO2_RS485_MODE BIT(2) + +/* CP2102N configuration array indices */ +#define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2 +#define CP210X_2NCONFIG_GPIO_MODE_IDX 581 +#define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587 +#define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600 + +/* CP2102N QFN20 port configuration values */ +#define CP2102N_QFN20_GPIO2_TXLED_MODE BIT(2) +#define CP2102N_QFN20_GPIO3_RXLED_MODE BIT(3) +#define CP2102N_QFN20_GPIO1_RS485_MODE BIT(4) +#define CP2102N_QFN20_GPIO0_CLK_MODE BIT(6) + +/* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */ +struct cp210x_gpio_write { + u8 mask; + u8 state; +}; + +/* + * Helper to get interface number when we only have struct usb_serial. + */ +static u8 cp210x_interface_num(struct usb_serial *serial) +{ + struct usb_host_interface *cur_altsetting; + + cur_altsetting = serial->interface->cur_altsetting; + + return cur_altsetting->desc.bInterfaceNumber; +} + +/* + * Reads a variable-sized block of CP210X_ registers, identified by req. + * Returns data into buf in native USB byte order. + */ +static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, + void *buf, int bufsize) +{ + struct usb_serial *serial = port->serial; + struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); + void *dmabuf; + int result; + + dmabuf = kmalloc(bufsize, GFP_KERNEL); + if (!dmabuf) { + /* + * FIXME Some callers don't bother to check for error, + * at least give them consistent junk until they are fixed + */ + memset(buf, 0, bufsize); + return -ENOMEM; + } + + result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), + req, REQTYPE_INTERFACE_TO_HOST, 0, + port_priv->bInterfaceNumber, dmabuf, bufsize, + USB_CTRL_SET_TIMEOUT); + if (result == bufsize) { + memcpy(buf, dmabuf, bufsize); + result = 0; + } else { + dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", + req, bufsize, result); + if (result >= 0) + result = -EIO; + + /* + * FIXME Some callers don't bother to check for error, + * at least give them consistent junk until they are fixed + */ + memset(buf, 0, bufsize); + } + + kfree(dmabuf); + + return result; +} + +/* + * Reads any 32-bit CP210X_ register identified by req. + */ +static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val) +{ + __le32 le32_val; + int err; + + err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val)); + if (err) { + /* + * FIXME Some callers don't bother to check for error, + * at least give them consistent junk until they are fixed + */ + *val = 0; + return err; + } + + *val = le32_to_cpu(le32_val); + + return 0; +} + +/* + * Reads any 16-bit CP210X_ register identified by req. + */ +static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val) +{ + __le16 le16_val; + int err; + + err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val)); + if (err) + return err; + + *val = le16_to_cpu(le16_val); + + return 0; +} + +/* + * Reads any 8-bit CP210X_ register identified by req. + */ +static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val) +{ + return cp210x_read_reg_block(port, req, val, sizeof(*val)); +} + +/* + * Reads a variable-sized vendor block of CP210X_ registers, identified by val. + * Returns data into buf in native USB byte order. + */ +static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val, + void *buf, int bufsize) +{ + void *dmabuf; + int result; + + dmabuf = kmalloc(bufsize, GFP_KERNEL); + if (!dmabuf) + return -ENOMEM; + + result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), + CP210X_VENDOR_SPECIFIC, type, val, + cp210x_interface_num(serial), dmabuf, bufsize, + USB_CTRL_GET_TIMEOUT); + if (result == bufsize) { + memcpy(buf, dmabuf, bufsize); + result = 0; + } else { + dev_err(&serial->interface->dev, + "failed to get vendor val 0x%04x size %d: %d\n", val, + bufsize, result); + if (result >= 0) + result = -EIO; + } + + kfree(dmabuf); + + return result; +} + +/* + * Writes any 16-bit CP210X_ register (req) whose value is passed + * entirely in the wValue field of the USB request. + */ +static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) +{ + struct usb_serial *serial = port->serial; + struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); + int result; + + result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), + req, REQTYPE_HOST_TO_INTERFACE, val, + port_priv->bInterfaceNumber, NULL, 0, + USB_CTRL_SET_TIMEOUT); + if (result < 0) { + dev_err(&port->dev, "failed set request 0x%x status: %d\n", + req, result); + } + + return result; +} + +/* + * Writes a variable-sized block of CP210X_ registers, identified by req. + * Data in buf must be in native USB byte order. + */ +static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req, + void *buf, int bufsize) +{ + struct usb_serial *serial = port->serial; + struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); + void *dmabuf; + int result; + + dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); + if (!dmabuf) + return -ENOMEM; + + result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), + req, REQTYPE_HOST_TO_INTERFACE, 0, + port_priv->bInterfaceNumber, dmabuf, bufsize, + USB_CTRL_SET_TIMEOUT); + + kfree(dmabuf); + + if (result == bufsize) { + result = 0; + } else { + dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", + req, bufsize, result); + if (result >= 0) + result = -EIO; + } + + return result; +} + +/* + * Writes any 32-bit CP210X_ register identified by req. + */ +static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) +{ + __le32 le32_val; + + le32_val = cpu_to_le32(val); + + return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); +} + +#ifdef CONFIG_GPIOLIB +/* + * Writes a variable-sized vendor block of CP210X_ registers, identified by val. + * Data in buf must be in native USB byte order. + */ +static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type, + u16 val, void *buf, int bufsize) +{ + void *dmabuf; + int result; + + dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); + if (!dmabuf) + return -ENOMEM; + + result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), + CP210X_VENDOR_SPECIFIC, type, val, + cp210x_interface_num(serial), dmabuf, bufsize, + USB_CTRL_SET_TIMEOUT); + + kfree(dmabuf); + + if (result == bufsize) { + result = 0; + } else { + dev_err(&serial->interface->dev, + "failed to set vendor val 0x%04x size %d: %d\n", val, + bufsize, result); + if (result >= 0) + result = -EIO; + } + + return result; +} +#endif + +/* + * Detect CP2108 GET_LINE_CTL bug and activate workaround. + * Write a known good value 0x800, read it back. + * If it comes back swapped the bug is detected. + * Preserve the original register value. + */ +static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port) +{ + struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); + u16 line_ctl_save; + u16 line_ctl_test; + int err; + + err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save); + if (err) + return err; + + err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800); + if (err) + return err; + + err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test); + if (err) + return err; + + if (line_ctl_test == 8) { + port_priv->has_swapped_line_ctl = true; + line_ctl_save = swab16(line_ctl_save); + } + + return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save); +} + +/* + * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL) + * to workaround cp2108 bug and get correct value. + */ +static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl) +{ + struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); + int err; + + err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl); + if (err) + return err; + + /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */ + if (port_priv->has_swapped_line_ctl) + *ctl = swab16(*ctl); + + return 0; +} + +static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) +{ + struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); + int result; + + result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); + if (result) { + dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); + return result; + } + + /* Configure the termios structure */ + cp210x_get_termios(tty, port); + + if (tty) { + /* The baud rate must be initialised on cp2104 */ + cp210x_change_speed(tty, port, NULL); + + if (I_INPCK(tty)) + cp210x_enable_event_mode(port); + } + + result = usb_serial_generic_open(tty, port); + if (result) + goto err_disable; + + return 0; + +err_disable: + cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); + port_priv->event_mode = false; + + return result; +} + +static void cp210x_close(struct usb_serial_port *port) +{ + struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); + + usb_serial_generic_close(port); + + /* Clear both queues; cp2108 needs this to avoid an occasional hang */ + cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); + + cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); + + /* Disabling the interface disables event-insertion mode. */ + port_priv->event_mode = false; +} + +static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag) +{ + if (lsr & CP210X_LSR_BREAK) { + port->icount.brk++; + *flag = TTY_BREAK; + } else if (lsr & CP210X_LSR_PARITY) { + port->icount.parity++; + *flag = TTY_PARITY; + } else if (lsr & CP210X_LSR_FRAME) { + port->icount.frame++; + *flag = TTY_FRAME; + } + + if (lsr & CP210X_LSR_OVERRUN) { + port->icount.overrun++; + tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); + } +} + +static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag) +{ + struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); + + switch (port_priv->event_state) { + case ES_DATA: + if (*ch == CP210X_ESCCHAR) { + port_priv->event_state = ES_ESCAPE; + break; + } + return false; + case ES_ESCAPE: + switch (*ch) { + case 0: + dev_dbg(&port->dev, "%s - escape char\n", __func__); + *ch = CP210X_ESCCHAR; + port_priv->event_state = ES_DATA; + return false; + case 1: + port_priv->event_state = ES_LSR_DATA_0; + break; + case 2: + port_priv->event_state = ES_LSR; + break; + case 3: + port_priv->event_state = ES_MSR; + break; + default: + dev_err(&port->dev, "malformed event 0x%02x\n", *ch); + port_priv->event_state = ES_DATA; + break; + } + break; + case ES_LSR_DATA_0: + port_priv->lsr = *ch; + port_priv->event_state = ES_LSR_DATA_1; + break; + case ES_LSR_DATA_1: + dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n", + __func__, port_priv->lsr, *ch); + cp210x_process_lsr(port, port_priv->lsr, flag); + port_priv->event_state = ES_DATA; + return false; + case ES_LSR: + dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch); + port_priv->lsr = *ch; + cp210x_process_lsr(port, port_priv->lsr, flag); + port_priv->event_state = ES_DATA; + break; + case ES_MSR: + dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch); + /* unimplemented */ + port_priv->event_state = ES_DATA; + break; + } + + return true; +} + +static void cp210x_process_read_urb(struct urb *urb) +{ + struct usb_serial_port *port = urb->context; + struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); + unsigned char *ch = urb->transfer_buffer; + char flag; + int i; + + if (!urb->actual_length) + return; + + if (port_priv->event_mode) { + for (i = 0; i < urb->actual_length; i++, ch++) { + flag = TTY_NORMAL; + + if (cp210x_process_char(port, ch, &flag)) + continue; + + tty_insert_flip_char(&port->port, *ch, flag); + } + } else { + tty_insert_flip_string(&port->port, ch, urb->actual_length); + } + tty_flip_buffer_push(&port->port); +} + +/* + * Read how many bytes are waiting in the TX queue. + */ +static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, + u32 *count) +{ + struct usb_serial *serial = port->serial; + struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); + struct cp210x_comm_status *sts; + int result; + + sts = kmalloc(sizeof(*sts), GFP_KERNEL); + if (!sts) + return -ENOMEM; + + result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), + CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST, + 0, port_priv->bInterfaceNumber, sts, sizeof(*sts), + USB_CTRL_GET_TIMEOUT); + if (result == sizeof(*sts)) { + *count = le32_to_cpu(sts->ulAmountInOutQueue); + result = 0; + } else { + dev_err(&port->dev, "failed to get comm status: %d\n", result); + if (result >= 0) + result = -EIO; + } + + kfree(sts); + + return result; +} + +static bool cp210x_tx_empty(struct usb_serial_port *port) +{ + int err; + u32 count; + + err = cp210x_get_tx_queue_byte_count(port, &count); + if (err) + return true; + + return !count; +} + +/* + * cp210x_get_termios + * Reads the baud rate, data bits, parity, stop bits and flow control mode + * from the device, corrects any unsupported values, and configures the + * termios structure to reflect the state of the device + */ +static void cp210x_get_termios(struct tty_struct *tty, + struct usb_serial_port *port) +{ + unsigned int baud; + + if (tty) { + cp210x_get_termios_port(tty->driver_data, + &tty->termios.c_cflag, &baud); + tty_encode_baud_rate(tty, baud, baud); + } else { + tcflag_t cflag; + cflag = 0; + cp210x_get_termios_port(port, &cflag, &baud); + } +} + +/* + * cp210x_get_termios_port + * This is the heart of cp210x_get_termios which always uses a &usb_serial_port. + */ +static void cp210x_get_termios_port(struct usb_serial_port *port, + tcflag_t *cflagp, unsigned int *baudp) +{ + struct device *dev = &port->dev; + tcflag_t cflag; + struct cp210x_flow_ctl flow_ctl; + u32 baud; + u16 bits; + u32 ctl_hs; + u32 flow_repl; + + cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud); + + dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud); + *baudp = baud; + + cflag = *cflagp; + + cp210x_get_line_ctl(port, &bits); + cflag &= ~CSIZE; + switch (bits & BITS_DATA_MASK) { + case BITS_DATA_5: + dev_dbg(dev, "%s - data bits = 5\n", __func__); + cflag |= CS5; + break; + case BITS_DATA_6: + dev_dbg(dev, "%s - data bits = 6\n", __func__); + cflag |= CS6; + break; + case BITS_DATA_7: + dev_dbg(dev, "%s - data bits = 7\n", __func__); + cflag |= CS7; + break; + case BITS_DATA_8: + dev_dbg(dev, "%s - data bits = 8\n", __func__); + cflag |= CS8; + break; + case BITS_DATA_9: + dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__); + cflag |= CS8; + bits &= ~BITS_DATA_MASK; + bits |= BITS_DATA_8; + cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); + break; + default: + dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__); + cflag |= CS8; + bits &= ~BITS_DATA_MASK; + bits |= BITS_DATA_8; + cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); + break; + } + + switch (bits & BITS_PARITY_MASK) { + case BITS_PARITY_NONE: + dev_dbg(dev, "%s - parity = NONE\n", __func__); + cflag &= ~PARENB; + break; + case BITS_PARITY_ODD: + dev_dbg(dev, "%s - parity = ODD\n", __func__); + cflag |= (PARENB|PARODD); + break; + case BITS_PARITY_EVEN: + dev_dbg(dev, "%s - parity = EVEN\n", __func__); + cflag &= ~PARODD; + cflag |= PARENB; + break; + case BITS_PARITY_MARK: + dev_dbg(dev, "%s - parity = MARK\n", __func__); + cflag |= (PARENB|PARODD|CMSPAR); + break; + case BITS_PARITY_SPACE: + dev_dbg(dev, "%s - parity = SPACE\n", __func__); + cflag &= ~PARODD; + cflag |= (PARENB|CMSPAR); + break; + default: + dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__); + cflag &= ~PARENB; + bits &= ~BITS_PARITY_MASK; + cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); + break; + } + + cflag &= ~CSTOPB; + switch (bits & BITS_STOP_MASK) { + case BITS_STOP_1: + dev_dbg(dev, "%s - stop bits = 1\n", __func__); + break; + case BITS_STOP_1_5: + dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__); + bits &= ~BITS_STOP_MASK; + cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); + break; + case BITS_STOP_2: + dev_dbg(dev, "%s - stop bits = 2\n", __func__); + cflag |= CSTOPB; + break; + default: + dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__); + bits &= ~BITS_STOP_MASK; + cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); + break; + } + + cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, + sizeof(flow_ctl)); + ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); + if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) { + dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); + /* + * When the port is closed, the CP210x hardware disables + * auto-RTS and RTS is deasserted but it leaves auto-CTS when + * in hardware flow control mode. When re-opening the port, if + * auto-CTS is enabled on the cp210x, then auto-RTS must be + * re-enabled in the driver. + */ + flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); + flow_repl &= ~CP210X_SERIAL_RTS_MASK; + flow_repl |= CP210X_SERIAL_RTS_SHIFT(CP210X_SERIAL_RTS_FLOW_CTL); + flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); + cp210x_write_reg_block(port, + CP210X_SET_FLOW, + &flow_ctl, + sizeof(flow_ctl)); + + cflag |= CRTSCTS; + } else { + dev_dbg(dev, "%s - flow control = NONE\n", __func__); + cflag &= ~CRTSCTS; + } + + *cflagp = cflag; +} + +struct cp210x_rate { + speed_t rate; + speed_t high; +}; + +static const struct cp210x_rate cp210x_an205_table1[] = { + { 300, 300 }, + { 600, 600 }, + { 1200, 1200 }, + { 1800, 1800 }, + { 2400, 2400 }, + { 4000, 4000 }, + { 4800, 4803 }, + { 7200, 7207 }, + { 9600, 9612 }, + { 14400, 14428 }, + { 16000, 16062 }, + { 19200, 19250 }, + { 28800, 28912 }, + { 38400, 38601 }, + { 51200, 51558 }, + { 56000, 56280 }, + { 57600, 58053 }, + { 64000, 64111 }, + { 76800, 77608 }, + { 115200, 117028 }, + { 128000, 129347 }, + { 153600, 156868 }, + { 230400, 237832 }, + { 250000, 254234 }, + { 256000, 273066 }, + { 460800, 491520 }, + { 500000, 567138 }, + { 576000, 670254 }, + { 921600, UINT_MAX } +}; + +/* + * Quantises the baud rate as per AN205 Table 1 + */ +static speed_t cp210x_get_an205_rate(speed_t baud) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) { + if (baud <= cp210x_an205_table1[i].high) + break; + } + + return cp210x_an205_table1[i].rate; +} + +static speed_t cp210x_get_actual_rate(speed_t baud) +{ + unsigned int prescale = 1; + unsigned int div; + + if (baud <= 365) + prescale = 4; + + div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud); + baud = 48000000 / (2 * prescale * div); + + return baud; +} + +/* + * CP2101 supports the following baud rates: + * + * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, + * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 + * + * CP2102 and CP2103 support the following additional rates: + * + * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, + * 576000 + * + * The device will map a requested rate to a supported one, but the result + * of requests for rates greater than 1053257 is undefined (see AN205). + * + * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, + * respectively, with an error less than 1%. The actual rates are determined + * by + * + * div = round(freq / (2 x prescale x request)) + * actual = freq / (2 x prescale x div) + * + * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps + * or 1 otherwise. + * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 + * otherwise. + */ +static void cp210x_change_speed(struct tty_struct *tty, + struct usb_serial_port *port, struct ktermios *old_termios) +{ + struct usb_serial *serial = port->serial; + struct cp210x_serial_private *priv = usb_get_serial_data(serial); + u32 baud; + + /* + * This maps the requested rate to the actual rate, a valid rate on + * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed]. + * + * NOTE: B0 is not implemented. + */ + baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed); + + if (priv->use_actual_rate) + baud = cp210x_get_actual_rate(baud); + else if (baud < 1000000) + baud = cp210x_get_an205_rate(baud); + + dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); + if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { + dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); + if (old_termios) + baud = old_termios->c_ospeed; + else + baud = 9600; + } + + tty_encode_baud_rate(tty, baud, baud); +} + +static void cp210x_enable_event_mode(struct usb_serial_port *port) +{ + struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); + struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); + int ret; + + if (port_priv->event_mode) + return; + + if (priv->no_event_mode) + return; + + port_priv->event_state = ES_DATA; + port_priv->event_mode = true; + + ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR); + if (ret) { + dev_err(&port->dev, "failed to enable events: %d\n", ret); + port_priv->event_mode = false; + } +} + +static void cp210x_disable_event_mode(struct usb_serial_port *port) +{ + struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); + int ret; + + if (!port_priv->event_mode) + return; + + ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0); + if (ret) { + dev_err(&port->dev, "failed to disable events: %d\n", ret); + return; + } + + port_priv->event_mode = false; +} + +static void cp210x_set_termios(struct tty_struct *tty, + struct usb_serial_port *port, struct ktermios *old_termios) +{ + struct device *dev = &port->dev; + unsigned int cflag, old_cflag; + u16 bits; + + cflag = tty->termios.c_cflag; + old_cflag = old_termios->c_cflag; + + if (tty->termios.c_ospeed != old_termios->c_ospeed) + cp210x_change_speed(tty, port, old_termios); + + /* If the number of data bits is to be updated */ + if ((cflag & CSIZE) != (old_cflag & CSIZE)) { + cp210x_get_line_ctl(port, &bits); + bits &= ~BITS_DATA_MASK; + switch (cflag & CSIZE) { + case CS5: + bits |= BITS_DATA_5; + dev_dbg(dev, "%s - data bits = 5\n", __func__); + break; + case CS6: + bits |= BITS_DATA_6; + dev_dbg(dev, "%s - data bits = 6\n", __func__); + break; + case CS7: + bits |= BITS_DATA_7; + dev_dbg(dev, "%s - data bits = 7\n", __func__); + break; + case CS8: + default: + bits |= BITS_DATA_8; + dev_dbg(dev, "%s - data bits = 8\n", __func__); + break; + } + if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) + dev_dbg(dev, "Number of data bits requested not supported by device\n"); + } + + if ((cflag & (PARENB|PARODD|CMSPAR)) != + (old_cflag & (PARENB|PARODD|CMSPAR))) { + cp210x_get_line_ctl(port, &bits); + bits &= ~BITS_PARITY_MASK; + if (cflag & PARENB) { + if (cflag & CMSPAR) { + if (cflag & PARODD) { + bits |= BITS_PARITY_MARK; + dev_dbg(dev, "%s - parity = MARK\n", __func__); + } else { + bits |= BITS_PARITY_SPACE; + dev_dbg(dev, "%s - parity = SPACE\n", __func__); + } + } else { + if (cflag & PARODD) { + bits |= BITS_PARITY_ODD; + dev_dbg(dev, "%s - parity = ODD\n", __func__); + } else { + bits |= BITS_PARITY_EVEN; + dev_dbg(dev, "%s - parity = EVEN\n", __func__); + } + } + } + if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) + dev_dbg(dev, "Parity mode not supported by device\n"); + } + + if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { + cp210x_get_line_ctl(port, &bits); + bits &= ~BITS_STOP_MASK; + if (cflag & CSTOPB) { + bits |= BITS_STOP_2; + dev_dbg(dev, "%s - stop bits = 2\n", __func__); + } else { + bits |= BITS_STOP_1; + dev_dbg(dev, "%s - stop bits = 1\n", __func__); + } + if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) + dev_dbg(dev, "Number of stop bits requested not supported by device\n"); + } + + if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { + struct cp210x_flow_ctl flow_ctl; + u32 ctl_hs; + u32 flow_repl; + + cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, + sizeof(flow_ctl)); + ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); + flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); + dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n", + __func__, ctl_hs, flow_repl); + + ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE; + ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE; + ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY; + ctl_hs &= ~CP210X_SERIAL_DTR_MASK; + ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE); + if (cflag & CRTSCTS) { + ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE; + + flow_repl &= ~CP210X_SERIAL_RTS_MASK; + flow_repl |= CP210X_SERIAL_RTS_SHIFT( + CP210X_SERIAL_RTS_FLOW_CTL); + dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); + } else { + ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE; + + flow_repl &= ~CP210X_SERIAL_RTS_MASK; + flow_repl |= CP210X_SERIAL_RTS_SHIFT( + CP210X_SERIAL_RTS_ACTIVE); + dev_dbg(dev, "%s - flow control = NONE\n", __func__); + } + + dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n", + __func__, ctl_hs, flow_repl); + flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); + flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); + cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, + sizeof(flow_ctl)); + } + + /* + * Enable event-insertion mode only if input parity checking is + * enabled for now. + */ + if (I_INPCK(tty)) + cp210x_enable_event_mode(port); + else + cp210x_disable_event_mode(port); +} + +static int cp210x_tiocmset(struct tty_struct *tty, + unsigned int set, unsigned int clear) +{ + struct usb_serial_port *port = tty->driver_data; + return cp210x_tiocmset_port(port, set, clear); +} + +static int cp210x_tiocmset_port(struct usb_serial_port *port, + unsigned int set, unsigned int clear) +{ + u16 control = 0; + + if (set & TIOCM_RTS) { + control |= CONTROL_RTS; + control |= CONTROL_WRITE_RTS; + } + if (set & TIOCM_DTR) { + control |= CONTROL_DTR; + control |= CONTROL_WRITE_DTR; + } + if (clear & TIOCM_RTS) { + control &= ~CONTROL_RTS; + control |= CONTROL_WRITE_RTS; + } + if (clear & TIOCM_DTR) { + control &= ~CONTROL_DTR; + control |= CONTROL_WRITE_DTR; + } + + dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control); + + return cp210x_write_u16_reg(port, CP210X_SET_MHS, control); +} + +static void cp210x_dtr_rts(struct usb_serial_port *p, int on) +{ + if (on) + cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0); + else + cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS); +} + +static int cp210x_tiocmget(struct tty_struct *tty) +{ + struct usb_serial_port *port = tty->driver_data; + u8 control; + int result; + + result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); + if (result) + return result; + + result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) + |((control & CONTROL_RTS) ? TIOCM_RTS : 0) + |((control & CONTROL_CTS) ? TIOCM_CTS : 0) + |((control & CONTROL_DSR) ? TIOCM_DSR : 0) + |((control & CONTROL_RING)? TIOCM_RI : 0) + |((control & CONTROL_DCD) ? TIOCM_CD : 0); + + dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control); + + return result; +} + +static void cp210x_break_ctl(struct tty_struct *tty, int break_state) +{ + struct usb_serial_port *port = tty->driver_data; + u16 state; + + if (break_state == 0) + state = BREAK_OFF; + else + state = BREAK_ON; + dev_dbg(&port->dev, "%s - turning break %s\n", __func__, + state == BREAK_OFF ? "off" : "on"); + cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); +} + +#ifdef CONFIG_GPIOLIB +static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset) +{ + struct usb_serial *serial = gpiochip_get_data(gc); + struct cp210x_serial_private *priv = usb_get_serial_data(serial); + + if (priv->gpio_altfunc & BIT(offset)) + return -ENODEV; + + return 0; +} + +static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio) +{ + struct usb_serial *serial = gpiochip_get_data(gc); + struct cp210x_serial_private *priv = usb_get_serial_data(serial); + u8 req_type = REQTYPE_DEVICE_TO_HOST; + int result; + u8 buf; + + if (priv->partnum == CP210X_PARTNUM_CP2105) + req_type = REQTYPE_INTERFACE_TO_HOST; + + result = usb_autopm_get_interface(serial->interface); + if (result) + return result; + + result = cp210x_read_vendor_block(serial, req_type, + CP210X_READ_LATCH, &buf, sizeof(buf)); + usb_autopm_put_interface(serial->interface); + if (result < 0) + return result; + + return !!(buf & BIT(gpio)); +} + +static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value) +{ + struct usb_serial *serial = gpiochip_get_data(gc); + struct cp210x_serial_private *priv = usb_get_serial_data(serial); + struct cp210x_gpio_write buf; + int result; + + if (value == 1) + buf.state = BIT(gpio); + else + buf.state = 0; + + buf.mask = BIT(gpio); + + result = usb_autopm_get_interface(serial->interface); + if (result) + goto out; + + if (priv->partnum == CP210X_PARTNUM_CP2105) { + result = cp210x_write_vendor_block(serial, + REQTYPE_HOST_TO_INTERFACE, + CP210X_WRITE_LATCH, &buf, + sizeof(buf)); + } else { + u16 wIndex = buf.state << 8 | buf.mask; + + result = usb_control_msg(serial->dev, + usb_sndctrlpipe(serial->dev, 0), + CP210X_VENDOR_SPECIFIC, + REQTYPE_HOST_TO_DEVICE, + CP210X_WRITE_LATCH, + wIndex, + NULL, 0, USB_CTRL_SET_TIMEOUT); + } + + usb_autopm_put_interface(serial->interface); +out: + if (result < 0) { + dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n", + result); + } +} + +static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio) +{ + struct usb_serial *serial = gpiochip_get_data(gc); + struct cp210x_serial_private *priv = usb_get_serial_data(serial); + + return priv->gpio_input & BIT(gpio); +} + +static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio) +{ + struct usb_serial *serial = gpiochip_get_data(gc); + struct cp210x_serial_private *priv = usb_get_serial_data(serial); + + if (priv->partnum == CP210X_PARTNUM_CP2105) { + /* hardware does not support an input mode */ + return -ENOTSUPP; + } + + /* push-pull pins cannot be changed to be inputs */ + if (priv->gpio_pushpull & BIT(gpio)) + return -EINVAL; + + /* make sure to release pin if it is being driven low */ + cp210x_gpio_set(gc, gpio, 1); + + priv->gpio_input |= BIT(gpio); + + return 0; +} + +static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio, + int value) +{ + struct usb_serial *serial = gpiochip_get_data(gc); + struct cp210x_serial_private *priv = usb_get_serial_data(serial); + + priv->gpio_input &= ~BIT(gpio); + cp210x_gpio_set(gc, gpio, value); + + return 0; +} + +static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio, + unsigned long config) +{ + struct usb_serial *serial = gpiochip_get_data(gc); + struct cp210x_serial_private *priv = usb_get_serial_data(serial); + enum pin_config_param param = pinconf_to_config_param(config); + + /* Succeed only if in correct mode (this can't be set at runtime) */ + if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) && + (priv->gpio_pushpull & BIT(gpio))) + return 0; + + if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) && + !(priv->gpio_pushpull & BIT(gpio))) + return 0; + + return -ENOTSUPP; +} + +/* + * This function is for configuring GPIO using shared pins, where other signals + * are made unavailable by configuring the use of GPIO. This is believed to be + * only applicable to the cp2105 at this point, the other devices supported by + * this driver that provide GPIO do so in a way that does not impact other + * signals and are thus expected to have very different initialisation. + */ +static int cp2105_gpioconf_init(struct usb_serial *serial) +{ + struct cp210x_serial_private *priv = usb_get_serial_data(serial); + struct cp210x_pin_mode mode; + struct cp210x_dual_port_config config; + u8 intf_num = cp210x_interface_num(serial); + u8 iface_config; + int result; + + result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, + CP210X_GET_DEVICEMODE, &mode, + sizeof(mode)); + if (result < 0) + return result; + + result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, + CP210X_GET_PORTCONFIG, &config, + sizeof(config)); + if (result < 0) + return result; + + /* 2 banks of GPIO - One for the pins taken from each serial port */ + if (intf_num == 0) { + priv->gc.ngpio = 2; + + if (mode.eci == CP210X_PIN_MODE_MODEM) { + /* mark all GPIOs of this interface as reserved */ + priv->gpio_altfunc = 0xff; + return 0; + } + + iface_config = config.eci_cfg; + priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & + CP210X_ECI_GPIO_MODE_MASK) >> + CP210X_ECI_GPIO_MODE_OFFSET); + } else if (intf_num == 1) { + priv->gc.ngpio = 3; + + if (mode.sci == CP210X_PIN_MODE_MODEM) { + /* mark all GPIOs of this interface as reserved */ + priv->gpio_altfunc = 0xff; + return 0; + } + + iface_config = config.sci_cfg; + priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & + CP210X_SCI_GPIO_MODE_MASK) >> + CP210X_SCI_GPIO_MODE_OFFSET); + } else { + return -ENODEV; + } + + /* mark all pins which are not in GPIO mode */ + if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */ + priv->gpio_altfunc |= BIT(0); + if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */ + CP2105_GPIO1_RS485_MODE)) + priv->gpio_altfunc |= BIT(1); + + /* driver implementation for CP2105 only supports outputs */ + priv->gpio_input = 0; + + return 0; +} + +static int cp2104_gpioconf_init(struct usb_serial *serial) +{ + struct cp210x_serial_private *priv = usb_get_serial_data(serial); + struct cp210x_single_port_config config; + u8 iface_config; + u8 gpio_latch; + int result; + u8 i; + + result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, + CP210X_GET_PORTCONFIG, &config, + sizeof(config)); + if (result < 0) + return result; + + priv->gc.ngpio = 4; + + iface_config = config.device_cfg; + priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & + CP210X_GPIO_MODE_MASK) >> + CP210X_GPIO_MODE_OFFSET); + gpio_latch = (u8)((le16_to_cpu(config.reset_state) & + CP210X_GPIO_MODE_MASK) >> + CP210X_GPIO_MODE_OFFSET); + + /* mark all pins which are not in GPIO mode */ + if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */ + priv->gpio_altfunc |= BIT(0); + if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */ + priv->gpio_altfunc |= BIT(1); + if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */ + priv->gpio_altfunc |= BIT(2); + + /* + * Like CP2102N, CP2104 has also no strict input and output pin + * modes. + * Do the same input mode emulation as CP2102N. + */ + for (i = 0; i < priv->gc.ngpio; ++i) { + /* + * Set direction to "input" iff pin is open-drain and reset + * value is 1. + */ + if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) + priv->gpio_input |= BIT(i); + } + + return 0; +} + +static int cp2102n_gpioconf_init(struct usb_serial *serial) +{ + struct cp210x_serial_private *priv = usb_get_serial_data(serial); + const u16 config_size = 0x02a6; + u8 gpio_rst_latch; + u8 config_version; + u8 gpio_pushpull; + u8 *config_buf; + u8 gpio_latch; + u8 gpio_ctrl; + int result; + u8 i; + + /* + * Retrieve device configuration from the device. + * The array received contains all customization settings done at the + * factory/manufacturer. Format of the array is documented at the + * time of writing at: + * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa + */ + config_buf = kmalloc(config_size, GFP_KERNEL); + if (!config_buf) + return -ENOMEM; + + result = cp210x_read_vendor_block(serial, + REQTYPE_DEVICE_TO_HOST, + CP210X_READ_2NCONFIG, + config_buf, + config_size); + if (result < 0) { + kfree(config_buf); + return result; + } + + config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX]; + gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX]; + gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX]; + gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX]; + + kfree(config_buf); + + /* Make sure this is a config format we understand. */ + if (config_version != 0x01) + return -ENOTSUPP; + + priv->gc.ngpio = 4; + + /* + * Get default pin states after reset. Needed so we can determine + * the direction of an open-drain pin. + */ + gpio_latch = (gpio_rst_latch >> 3) & 0x0f; + + /* 0 indicates open-drain mode, 1 is push-pull */ + priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f; + + /* 0 indicates GPIO mode, 1 is alternate function */ + if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) { + /* QFN20 is special... */ + if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE) /* GPIO 0 */ + priv->gpio_altfunc |= BIT(0); + if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */ + priv->gpio_altfunc |= BIT(1); + if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */ + priv->gpio_altfunc |= BIT(2); + if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */ + priv->gpio_altfunc |= BIT(3); + } else { + priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f; + } + + if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) { + /* + * For the QFN28 package, GPIO4-6 are controlled by + * the low three bits of the mode/latch fields. + * Contrary to the document linked above, the bits for + * the SUSPEND pins are elsewhere. No alternate + * function is available for these pins. + */ + priv->gc.ngpio = 7; + gpio_latch |= (gpio_rst_latch & 7) << 4; + priv->gpio_pushpull |= (gpio_pushpull & 7) << 4; + } + + /* + * The CP2102N does not strictly has input and output pin modes, + * it only knows open-drain and push-pull modes which is set at + * factory. An open-drain pin can function both as an + * input or an output. We emulate input mode for open-drain pins + * by making sure they are not driven low, and we do not allow + * push-pull pins to be set as an input. + */ + for (i = 0; i < priv->gc.ngpio; ++i) { + /* + * Set direction to "input" iff pin is open-drain and reset + * value is 1. + */ + if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) + priv->gpio_input |= BIT(i); + } + + return 0; +} + +static int cp210x_gpio_init(struct usb_serial *serial) +{ + struct cp210x_serial_private *priv = usb_get_serial_data(serial); + int result; + + switch (priv->partnum) { + case CP210X_PARTNUM_CP2104: + result = cp2104_gpioconf_init(serial); + break; + case CP210X_PARTNUM_CP2105: + result = cp2105_gpioconf_init(serial); + break; + case CP210X_PARTNUM_CP2102N_QFN28: + case CP210X_PARTNUM_CP2102N_QFN24: + case CP210X_PARTNUM_CP2102N_QFN20: + result = cp2102n_gpioconf_init(serial); + break; + default: + return 0; + } + + if (result < 0) + return result; + + priv->gc.label = "cp210x"; + priv->gc.request = cp210x_gpio_request; + priv->gc.get_direction = cp210x_gpio_direction_get; + priv->gc.direction_input = cp210x_gpio_direction_input; + priv->gc.direction_output = cp210x_gpio_direction_output; + priv->gc.get = cp210x_gpio_get; + priv->gc.set = cp210x_gpio_set; + priv->gc.set_config = cp210x_gpio_set_config; + priv->gc.owner = THIS_MODULE; + priv->gc.parent = &serial->interface->dev; + priv->gc.base = -1; + priv->gc.can_sleep = true; + + result = gpiochip_add_data(&priv->gc, serial); + if (!result) + priv->gpio_registered = true; + + return result; +} + +static void cp210x_gpio_remove(struct usb_serial *serial) +{ + struct cp210x_serial_private *priv = usb_get_serial_data(serial); + + if (priv->gpio_registered) { + gpiochip_remove(&priv->gc); + priv->gpio_registered = false; + } +} + +#else + +static int cp210x_gpio_init(struct usb_serial *serial) +{ + return 0; +} + +static void cp210x_gpio_remove(struct usb_serial *serial) +{ + /* Nothing to do */ +} + +#endif + +static int cp210x_port_probe(struct usb_serial_port *port) +{ + struct usb_serial *serial = port->serial; + struct cp210x_port_private *port_priv; + int ret; + + port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); + if (!port_priv) + return -ENOMEM; + + port_priv->bInterfaceNumber = cp210x_interface_num(serial); + + usb_set_serial_port_data(port, port_priv); + + ret = cp210x_detect_swapped_line_ctl(port); + if (ret) { + kfree(port_priv); + return ret; + } + + return 0; +} + +static int cp210x_port_remove(struct usb_serial_port *port) +{ + struct cp210x_port_private *port_priv; + + port_priv = usb_get_serial_port_data(port); + kfree(port_priv); + + return 0; +} + +static void cp210x_init_max_speed(struct usb_serial *serial) +{ + struct cp210x_serial_private *priv = usb_get_serial_data(serial); + bool use_actual_rate = false; + speed_t min = 300; + speed_t max; + + switch (priv->partnum) { + case CP210X_PARTNUM_CP2101: + max = 921600; + break; + case CP210X_PARTNUM_CP2102: + case CP210X_PARTNUM_CP2103: + max = 1000000; + break; + case CP210X_PARTNUM_CP2104: + use_actual_rate = true; + max = 2000000; + break; + case CP210X_PARTNUM_CP2108: + max = 2000000; + break; + case CP210X_PARTNUM_CP2105: + if (cp210x_interface_num(serial) == 0) { + use_actual_rate = true; + max = 2000000; /* ECI */ + } else { + min = 2400; + max = 921600; /* SCI */ + } + break; + case CP210X_PARTNUM_CP2102N_QFN28: + case CP210X_PARTNUM_CP2102N_QFN24: + case CP210X_PARTNUM_CP2102N_QFN20: + use_actual_rate = true; + max = 3000000; + break; + default: + max = 2000000; + break; + } + + priv->min_speed = min; + priv->max_speed = max; + priv->use_actual_rate = use_actual_rate; +} + +static void cp2102_determine_quirks(struct usb_serial *serial) +{ + struct cp210x_serial_private *priv = usb_get_serial_data(serial); + u8 *buf; + int ret; + + buf = kmalloc(2, GFP_KERNEL); + if (!buf) + return; + /* + * Some (possibly counterfeit) CP2102 do not support event-insertion + * mode and respond differently to malformed vendor requests. + * Specifically, they return one instead of two bytes when sent a + * two-byte part-number request. + */ + ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), + CP210X_VENDOR_SPECIFIC, REQTYPE_DEVICE_TO_HOST, + CP210X_GET_PARTNUM, 0, buf, 2, USB_CTRL_GET_TIMEOUT); + if (ret == 1) { + dev_dbg(&serial->interface->dev, + "device does not support event-insertion mode\n"); + priv->no_event_mode = true; + } + + kfree(buf); +} + +static void cp210x_determine_quirks(struct usb_serial *serial) +{ + struct cp210x_serial_private *priv = usb_get_serial_data(serial); + + switch (priv->partnum) { + case CP210X_PARTNUM_CP2102: + cp2102_determine_quirks(serial); + break; + default: + break; + } +} + +static int cp210x_attach(struct usb_serial *serial) +{ + int result; + struct cp210x_serial_private *priv; + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, + CP210X_GET_PARTNUM, &priv->partnum, + sizeof(priv->partnum)); + if (result < 0) { + dev_warn(&serial->interface->dev, + "querying part number failed\n"); + priv->partnum = CP210X_PARTNUM_UNKNOWN; + } + + usb_set_serial_data(serial, priv); + + cp210x_determine_quirks(serial); + cp210x_init_max_speed(serial); + + result = cp210x_gpio_init(serial); + if (result < 0) { + dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n", + result); + } + + return 0; +} + +static void cp210x_disconnect(struct usb_serial *serial) +{ + cp210x_gpio_remove(serial); +} + +static void cp210x_release(struct usb_serial *serial) +{ + struct cp210x_serial_private *priv = usb_get_serial_data(serial); + + cp210x_gpio_remove(serial); + + kfree(priv); +} + +module_usb_serial_driver(serial_drivers, id_table); + +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL v2"); |