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android-kvm / linux / cfd7092c31aed7288725cb922bc10d9d52eac302 / . / drivers / usb / serial / cp210x.c
blob: c374620a486f0a53f3772fb34effb11220fe3624 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
/*
* Silicon Laboratories CP210x USB to RS232 serial adaptor driver
*
* Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
* Copyright (C) 2010-2021 Johan Hovold (johan@kernel.org)
*
* 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/usb.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_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 void cp210x_port_remove(struct usb_serial_port *);
static void cp210x_dtr_rts(struct usb_serial_port *port, 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, 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, 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, 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, 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;
u16 gpio_pushpull;
u16 gpio_altfunc;
u16 gpio_input;
#endif
u8 partnum;
u32 fw_version;
speed_t min_speed;
speed_t max_speed;
bool use_actual_rate;
bool no_flow_control;
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 event_mode;
enum cp210x_event_state event_state;
u8 lsr;
struct mutex mutex;
bool crtscts;
bool dtr;
bool rts;
};
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_(GET|SET)_CHARS */
struct cp210x_special_chars {
u8 bEofChar;
u8 bErrorChar;
u8 bBreakChar;
u8 bEventChar;
u8 bXonChar;
u8 bXoffChar;
};
/* CP210X_VENDOR_SPECIFIC values */
#define CP210X_GET_FW_VER 0x000E
#define CP210X_READ_2NCONFIG 0x000E
#define CP210X_GET_FW_VER_2N 0x0010
#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_INACTIVE (0 << 0)
#define CP210X_SERIAL_DTR_ACTIVE (1 << 0)
#define CP210X_SERIAL_DTR_FLOW_CTL (2 << 0)
#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)
/* 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_INACTIVE (0 << 6)
#define CP210X_SERIAL_RTS_ACTIVE (1 << 6)
#define CP210X_SERIAL_RTS_FLOW_CTL (2 << 6)
#define CP210X_SERIAL_XOFF_CONTINUE BIT(31)
/* 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)
struct cp210x_quad_port_state {
__le16 gpio_mode_pb0;
__le16 gpio_mode_pb1;
__le16 gpio_mode_pb2;
__le16 gpio_mode_pb3;
__le16 gpio_mode_pb4;
__le16 gpio_lowpower_pb0;
__le16 gpio_lowpower_pb1;
__le16 gpio_lowpower_pb2;
__le16 gpio_lowpower_pb3;
__le16 gpio_lowpower_pb4;
__le16 gpio_latch_pb0;
__le16 gpio_latch_pb1;
__le16 gpio_latch_pb2;
__le16 gpio_latch_pb3;
__le16 gpio_latch_pb4;
};
/*
* CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0x49 bytes
* on a CP2108 chip.
*
* See https://www.silabs.com/documents/public/application-notes/an978-cp210x-usb-to-uart-api-specification.pdf
*/
struct cp210x_quad_port_config {
struct cp210x_quad_port_state reset_state;
struct cp210x_quad_port_state suspend_state;
u8 ipdelay_ifc[4];
u8 enhancedfxn_ifc[4];
u8 enhancedfxn_device;
u8 extclkfreq[4];
} __packed;
#define CP2108_EF_IFC_GPIO_TXLED 0x01
#define CP2108_EF_IFC_GPIO_RXLED 0x02
#define CP2108_EF_IFC_GPIO_RS485 0x04
#define CP2108_EF_IFC_GPIO_RS485_LOGIC 0x08
#define CP2108_EF_IFC_GPIO_CLOCK 0x10
#define CP2108_EF_IFC_DYNAMIC_SUSPEND 0x40
/* 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 0x02 bytes
* for CP2102N, CP2103, CP2104 and CP2105.
*/
struct cp210x_gpio_write {
u8 mask;
u8 state;
};
/*
* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x04 bytes
* for CP2108.
*/
struct cp210x_gpio_write16 {
__le16 mask;
__le16 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);
int result;
result = usb_control_msg_recv(serial->dev, 0, req,
REQTYPE_INTERFACE_TO_HOST, 0,
port_priv->bInterfaceNumber, buf, bufsize,
USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
if (result) {
dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
req, bufsize, result);
return result;
}
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)
{
int result;
result = usb_control_msg_recv(serial->dev, 0, CP210X_VENDOR_SPECIFIC,
type, val, cp210x_interface_num(serial), buf, bufsize,
USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
if (result) {
dev_err(&serial->interface->dev,
"failed to get vendor val 0x%04x size %d: %d\n", val,
bufsize, result);
return result;
}
return 0;
}
/*
* 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);
int result;
result = usb_control_msg_send(serial->dev, 0, req,
REQTYPE_HOST_TO_INTERFACE, 0,
port_priv->bInterfaceNumber, buf, bufsize,
USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
if (result) {
dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
req, bufsize, result);
return result;
}
return 0;
}
/*
* 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)
{
int result;
result = usb_control_msg_send(serial->dev, 0, CP210X_VENDOR_SPECIFIC,
type, val, cp210x_interface_num(serial), buf, bufsize,
USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
if (result) {
dev_err(&serial->interface->dev,
"failed to set vendor val 0x%04x size %d: %d\n", val,
bufsize, result);
return result;
}
return 0;
}
#endif
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;
}
if (tty)
cp210x_set_termios(tty, port, NULL);
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;
result = usb_control_msg_recv(serial->dev, 0, CP210X_GET_COMM_STATUS,
REQTYPE_INTERFACE_TO_HOST, 0,
port_priv->bInterfaceNumber, &sts, sizeof(sts),
USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
if (result) {
dev_err(&port->dev, "failed to get comm status: %d\n", result);
return result;
}
*count = le32_to_cpu(sts.ulAmountInOutQueue);
return 0;
}
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;
}
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 bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b)
{
bool iflag_change, cc_change;
iflag_change = ((a->c_iflag ^ b->c_iflag) & (INPCK | IXON | IXOFF));
cc_change = a->c_cc[VSTART] != b->c_cc[VSTART] ||
a->c_cc[VSTOP] != b->c_cc[VSTOP];
return tty_termios_hw_change(a, b) || iflag_change || cc_change;
}
static void cp210x_set_flow_control(struct tty_struct *tty,
struct usb_serial_port *port, struct ktermios *old_termios)
{
struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
struct cp210x_special_chars chars;
struct cp210x_flow_ctl flow_ctl;
u32 flow_repl;
u32 ctl_hs;
bool crtscts;
int ret;
/*
* Some CP2102N interpret ulXonLimit as ulFlowReplace (erratum
* CP2102N_E104). Report back that flow control is not supported.
*/
if (priv->no_flow_control) {
tty->termios.c_cflag &= ~CRTSCTS;
tty->termios.c_iflag &= ~(IXON | IXOFF);
}
if (old_termios &&
C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) &&
I_IXON(tty) == (old_termios->c_iflag & IXON) &&
I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) &&
START_CHAR(tty) == old_termios->c_cc[VSTART] &&
STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) {
return;
}
if (I_IXON(tty) || I_IXOFF(tty)) {
memset(&chars, 0, sizeof(chars));
chars.bXonChar = START_CHAR(tty);
chars.bXoffChar = STOP_CHAR(tty);
ret = cp210x_write_reg_block(port, CP210X_SET_CHARS, &chars,
sizeof(chars));
if (ret) {
dev_err(&port->dev, "failed to set special chars: %d\n",
ret);
}
}
mutex_lock(&port_priv->mutex);
ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
sizeof(flow_ctl));
if (ret)
goto out_unlock;
ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
if (port_priv->dtr)
ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
else
ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
flow_repl &= ~CP210X_SERIAL_RTS_MASK;
if (C_CRTSCTS(tty)) {
ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
if (port_priv->rts)
flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
else
flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
crtscts = true;
} else {
ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
if (port_priv->rts)
flow_repl |= CP210X_SERIAL_RTS_ACTIVE;
else
flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
crtscts = false;
}
if (I_IXOFF(tty)) {
flow_repl |= CP210X_SERIAL_AUTO_RECEIVE;
flow_ctl.ulXonLimit = cpu_to_le32(128);
flow_ctl.ulXoffLimit = cpu_to_le32(128);
} else {
flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE;
}
if (I_IXON(tty))
flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT;
else
flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT;
dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__,
ctl_hs, flow_repl);
flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
sizeof(flow_ctl));
if (ret)
goto out_unlock;
port_priv->crtscts = crtscts;
out_unlock:
mutex_unlock(&port_priv->mutex);
}
static void cp210x_set_termios(struct tty_struct *tty,
struct usb_serial_port *port, struct ktermios *old_termios)
{
struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
u16 bits;
int ret;
if (old_termios && !cp210x_termios_change(&tty->termios, old_termios))
return;
if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed)
cp210x_change_speed(tty, port, old_termios);
/* CP2101 only supports CS8, 1 stop bit and non-stick parity. */
if (priv->partnum == CP210X_PARTNUM_CP2101) {
tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR);
tty->termios.c_cflag |= CS8;
}
bits = 0;
switch (C_CSIZE(tty)) {
case CS5:
bits |= BITS_DATA_5;
break;
case CS6:
bits |= BITS_DATA_6;
break;
case CS7:
bits |= BITS_DATA_7;
break;
case CS8:
default:
bits |= BITS_DATA_8;
break;
}
if (C_PARENB(tty)) {
if (C_CMSPAR(tty)) {
if (C_PARODD(tty))
bits |= BITS_PARITY_MARK;
else
bits |= BITS_PARITY_SPACE;
} else {
if (C_PARODD(tty))
bits |= BITS_PARITY_ODD;
else
bits |= BITS_PARITY_EVEN;
}
}
if (C_CSTOPB(tty))
bits |= BITS_STOP_2;
else
bits |= BITS_STOP_1;
ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
if (ret)
dev_err(&port->dev, "failed to set line control: %d\n", ret);
cp210x_set_flow_control(tty, port, old_termios);
/*
* 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)
{
struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
struct cp210x_flow_ctl flow_ctl;
u32 ctl_hs, flow_repl;
u16 control = 0;
int ret;
mutex_lock(&port_priv->mutex);
if (set & TIOCM_RTS) {
port_priv->rts = true;
control |= CONTROL_RTS;
control |= CONTROL_WRITE_RTS;
}
if (set & TIOCM_DTR) {
port_priv->dtr = true;
control |= CONTROL_DTR;
control |= CONTROL_WRITE_DTR;
}
if (clear & TIOCM_RTS) {
port_priv->rts = false;
control &= ~CONTROL_RTS;
control |= CONTROL_WRITE_RTS;
}
if (clear & TIOCM_DTR) {
port_priv->dtr = false;
control &= ~CONTROL_DTR;
control |= CONTROL_WRITE_DTR;
}
/*
* Use SET_FLOW to set DTR and enable/disable auto-RTS when hardware
* flow control is enabled.
*/
if (port_priv->crtscts && control & CONTROL_WRITE_RTS) {
ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
sizeof(flow_ctl));
if (ret)
goto out_unlock;
ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
if (port_priv->dtr)
ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
else
ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
flow_repl &= ~CP210X_SERIAL_RTS_MASK;
if (port_priv->rts)
flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
else
flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n",
__func__, ctl_hs, flow_repl);
ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
sizeof(flow_ctl));
} else {
dev_dbg(&port->dev, "%s - control = 0x%04x\n", __func__, control);
ret = cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
}
out_unlock:
mutex_unlock(&port_priv->mutex);
return ret;
}
static void cp210x_dtr_rts(struct usb_serial_port *port, int on)
{
if (on)
cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0);
else
cp210x_tiocmset_port(port, 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%02x\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_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;
u16 mask;
int result;
int len;
result = usb_autopm_get_interface(serial->interface);
if (result)
return result;
switch (priv->partnum) {
case CP210X_PARTNUM_CP2105:
req_type = REQTYPE_INTERFACE_TO_HOST;
len = 1;
break;
case CP210X_PARTNUM_CP2108:
req_type = REQTYPE_INTERFACE_TO_HOST;
len = 2;
break;
default:
req_type = REQTYPE_DEVICE_TO_HOST;
len = 1;
break;
}
mask = 0;
result = cp210x_read_vendor_block(serial, req_type, CP210X_READ_LATCH,
&mask, len);
usb_autopm_put_interface(serial->interface);
if (result < 0)
return result;
le16_to_cpus(&mask);
return !!(mask & 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_write16 buf16;
struct cp210x_gpio_write buf;
u16 mask, state;
u16 wIndex;
int result;
if (value == 1)
state = BIT(gpio);
else
state = 0;
mask = BIT(gpio);
result = usb_autopm_get_interface(serial->interface);
if (result)
goto out;
switch (priv->partnum) {
case CP210X_PARTNUM_CP2105:
buf.mask = (u8)mask;
buf.state = (u8)state;
result = cp210x_write_vendor_block(serial,
REQTYPE_HOST_TO_INTERFACE,
CP210X_WRITE_LATCH, &buf,
sizeof(buf));
break;
case CP210X_PARTNUM_CP2108:
buf16.mask = cpu_to_le16(mask);
buf16.state = cpu_to_le16(state);
result = cp210x_write_vendor_block(serial,
REQTYPE_HOST_TO_INTERFACE,
CP210X_WRITE_LATCH, &buf16,
sizeof(buf16));
break;
default:
wIndex = state << 8 | 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);
break;
}
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;
}
static int cp210x_gpio_init_valid_mask(struct gpio_chip *gc,
unsigned long *valid_mask, unsigned int ngpios)
{
struct usb_serial *serial = gpiochip_get_data(gc);
struct cp210x_serial_private *priv = usb_get_serial_data(serial);
struct device *dev = &serial->interface->dev;
unsigned long altfunc_mask = priv->gpio_altfunc;
bitmap_complement(valid_mask, &altfunc_mask, ngpios);
if (bitmap_empty(valid_mask, ngpios))
dev_dbg(dev, "no pin configured for GPIO\n");
else
dev_dbg(dev, "GPIO.%*pbl configured for GPIO\n", ngpios,
valid_mask);
return 0;
}
/*
* 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 cp2108_gpio_init(struct usb_serial *serial)
{
struct cp210x_serial_private *priv = usb_get_serial_data(serial);
struct cp210x_quad_port_config config;
u16 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 = 16;
priv->gpio_pushpull = le16_to_cpu(config.reset_state.gpio_mode_pb1);
gpio_latch = le16_to_cpu(config.reset_state.gpio_latch_pb1);
/*
* Mark all pins which are not in GPIO mode.
*
* Refer to table 9.1 "GPIO Mode alternate Functions" in the datasheet:
* https://www.silabs.com/documents/public/data-sheets/cp2108-datasheet.pdf
*
* Alternate functions of GPIO0 to GPIO3 are determine by enhancedfxn_ifc[0]
* and the similarly for the other pins; enhancedfxn_ifc[1]: GPIO4 to GPIO7,
* enhancedfxn_ifc[2]: GPIO8 to GPIO11, enhancedfxn_ifc[3]: GPIO12 to GPIO15.
*/
for (i = 0; i < 4; i++) {
if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_TXLED)
priv->gpio_altfunc |= BIT(i * 4);
if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RXLED)
priv->gpio_altfunc |= BIT((i * 4) + 1);
if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RS485)
priv->gpio_altfunc |= BIT((i * 4) + 2);
if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_CLOCK)
priv->gpio_altfunc |= BIT((i * 4) + 3);
}
/*
* Like CP2102N, CP2108 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_CP2108:
/*
* The GPIOs are not tied to any specific port so only register
* once for interface 0.
*/
if (cp210x_interface_num(serial) != 0)
return 0;
result = cp2108_gpio_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.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.init_valid_mask = cp210x_gpio_init_valid_mask;
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;
port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
if (!port_priv)
return -ENOMEM;
port_priv->bInterfaceNumber = cp210x_interface_num(serial);
mutex_init(&port_priv->mutex);
usb_set_serial_port_data(port, port_priv);
return 0;
}
static void 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);
}
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 int cp210x_get_fw_version(struct usb_serial *serial, u16 value)
{
struct cp210x_serial_private *priv = usb_get_serial_data(serial);
u8 ver[3];
int ret;
ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, value,
ver, sizeof(ver));
if (ret)
return ret;
dev_dbg(&serial->interface->dev, "%s - %d.%d.%d\n", __func__,
ver[0], ver[1], ver[2]);
priv->fw_version = ver[0] << 16 | ver[1] << 8 | ver[2];
return 0;
}
static void cp210x_determine_type(struct usb_serial *serial)
{
struct cp210x_serial_private *priv = usb_get_serial_data(serial);
int ret;
ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
CP210X_GET_PARTNUM, &priv->partnum,
sizeof(priv->partnum));
if (ret < 0) {
dev_warn(&serial->interface->dev,
"querying part number failed\n");
priv->partnum = CP210X_PARTNUM_UNKNOWN;
return;
}
dev_dbg(&serial->interface->dev, "partnum = 0x%02x\n", priv->partnum);
switch (priv->partnum) {
case CP210X_PARTNUM_CP2102:
cp2102_determine_quirks(serial);
break;
case CP210X_PARTNUM_CP2105:
case CP210X_PARTNUM_CP2108:
cp210x_get_fw_version(serial, CP210X_GET_FW_VER);
break;
case CP210X_PARTNUM_CP2102N_QFN28:
case CP210X_PARTNUM_CP2102N_QFN24:
case CP210X_PARTNUM_CP2102N_QFN20:
ret = cp210x_get_fw_version(serial, CP210X_GET_FW_VER_2N);
if (ret)
break;
if (priv->fw_version <= 0x10004)
priv->no_flow_control = true;
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;
usb_set_serial_data(serial, priv);
cp210x_determine_type(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");