1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
   4 *
   5 * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
   6 * Copyright (C) 2010-2021 Johan Hovold (johan@kernel.org)
 
 
 
   7 *
   8 * Support to set flow control line levels using TIOCMGET and TIOCMSET
   9 * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
  10 * control thanks to Munir Nassar nassarmu@real-time.com
  11 *
  12 */
  13
  14#include <linux/kernel.h>
  15#include <linux/errno.h>
  16#include <linux/slab.h>
  17#include <linux/tty.h>
  18#include <linux/tty_flip.h>
  19#include <linux/module.h>
 
  20#include <linux/usb.h>
 
  21#include <linux/usb/serial.h>
  22#include <linux/gpio/driver.h>
  23#include <linux/bitops.h>
  24#include <linux/mutex.h>
  25
  26#define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
  27
  28/*
  29 * Function Prototypes
  30 */
  31static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
  32static void cp210x_close(struct usb_serial_port *);
 
 
 
  33static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
  34				const struct ktermios *);
  35static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
  36			       const struct ktermios *);
  37static bool cp210x_tx_empty(struct usb_serial_port *port);
  38static int cp210x_tiocmget(struct tty_struct *);
  39static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
  40static int cp210x_tiocmset_port(struct usb_serial_port *port,
  41		unsigned int, unsigned int);
  42static void cp210x_break_ctl(struct tty_struct *, int);
  43static int cp210x_attach(struct usb_serial *);
  44static void cp210x_disconnect(struct usb_serial *);
  45static void cp210x_release(struct usb_serial *);
  46static int cp210x_port_probe(struct usb_serial_port *);
  47static void cp210x_port_remove(struct usb_serial_port *);
  48static void cp210x_dtr_rts(struct usb_serial_port *port, int on);
  49static void cp210x_process_read_urb(struct urb *urb);
  50static void cp210x_enable_event_mode(struct usb_serial_port *port);
  51static void cp210x_disable_event_mode(struct usb_serial_port *port);
  52
  53static const struct usb_device_id id_table[] = {
  54	{ USB_DEVICE(0x0404, 0x034C) },	/* NCR Retail IO Box */
  55	{ USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
  56	{ USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
  57	{ USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  58	{ USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  59	{ USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
  60	{ USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
  61	{ USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
  62	{ USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
  63	{ USB_DEVICE(0x0908, 0x0070) }, /* Siemens SCALANCE LPE-9000 USB Serial Console */
  64	{ USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
  65	{ USB_DEVICE(0x0988, 0x0578) }, /* Teraoka AD2000 */
  66	{ USB_DEVICE(0x0B00, 0x3070) }, /* Ingenico 3070 */
  67	{ USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
  68	{ USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
  69	{ USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  70	{ USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
  71	{ USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
  72	{ USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
  73	{ USB_DEVICE(0x106F, 0x0003) },	/* CPI / Money Controls Bulk Coin Recycler */
  74	{ USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  75	{ USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  76	{ USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  77	{ USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
  78	{ USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
  79	{ USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
  80	{ USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
  81	{ USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  82	{ USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
  83	{ USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
  84	{ USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
  85	{ USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
  86	{ USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */
  87	{ USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  88	{ USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
  89	{ USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  90	{ USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
  91	{ USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  92	{ USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
  93	{ USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  94	{ USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
  95	{ USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  96	{ USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
  97	{ USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
  98	{ USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
  99	{ USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
 100	{ USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
 101	{ USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
 102	{ USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
 103	{ USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */
 104	{ USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */
 105	{ USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */
 106	{ USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
 107	{ USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
 108	{ USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
 109	{ USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
 110	{ USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
 111	{ USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
 112	{ USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
 113	{ USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
 114	{ USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
 115	{ USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
 116	{ USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
 117	{ USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
 118	{ USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
 119	{ USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
 120	{ USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
 121	{ USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
 122	{ USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
 123	{ USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */
 124	{ USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */
 125	{ USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */
 126	{ USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
 127	{ USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
 128	{ USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
 129	{ USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
 130	{ USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
 131	{ USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */
 132	{ USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
 133	{ USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
 134	{ USB_DEVICE(0x10C4, 0x8414) }, /* Decagon USB Cable Adapter */
 135	{ USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
 136	{ USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
 137	{ USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
 138	{ USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
 139	{ USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
 140	{ USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */
 141	{ USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */
 142	{ USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */
 143	{ USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
 144	{ USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
 145	{ USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
 146	{ USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
 147	{ USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
 148	{ USB_DEVICE(0x10C4, 0x8856) },	/* CEL EM357 ZigBee USB Stick - LR */
 149	{ USB_DEVICE(0x10C4, 0x8857) },	/* CEL EM357 ZigBee USB Stick */
 150	{ USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
 151	{ USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
 152	{ USB_DEVICE(0x10C4, 0x88D8) }, /* Acuity Brands nLight Air Adapter */
 153	{ USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */
 154	{ USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */
 155	{ USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
 156	{ USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
 157	{ USB_DEVICE(0x10C4, 0x8977) },	/* CEL MeshWorks DevKit Device */
 158	{ USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
 159	{ USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */
 160	{ USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */
 161	{ USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
 162	{ USB_DEVICE(0x10C4, 0x8A5B) }, /* CEL EM3588 ZigBee USB Stick */
 163	{ USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
 164	{ USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
 165	{ USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 166	{ USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 167	{ USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */
 168	{ USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
 
 169	{ USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
 170	{ USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */
 171	{ USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */
 172	{ USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 173	{ USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 174	{ USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 175	{ USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 176	{ USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 177	{ USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 178	{ USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
 179	{ USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
 180	{ USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 181	{ USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 182	{ USB_DEVICE(0x155A, 0x1006) },	/* ELDAT Easywave RX09 */
 183	{ USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
 184	{ USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
 185	{ USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 186	{ USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
 187	{ USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
 188	{ USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
 189	{ USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
 190	{ USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
 191	{ USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
 192	{ USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 193	{ USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
 194	{ USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
 195	{ USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
 196	{ USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
 197	{ USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
 198	{ USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
 199	{ USB_DEVICE(0x17A8, 0x0011) }, /* Kamstrup 444 MHz RF sniffer */
 200	{ USB_DEVICE(0x17A8, 0x0013) }, /* Kamstrup 870 MHz RF sniffer */
 201	{ USB_DEVICE(0x17A8, 0x0101) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Int Ant) */
 202	{ USB_DEVICE(0x17A8, 0x0102) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Ext Ant) */
 203	{ USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
 204	{ USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
 205	{ USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 206	{ USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
 207	{ USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
 208	{ USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
 209	{ USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
 210	{ USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
 211	{ USB_DEVICE(0x1901, 0x0194) },	/* GE Healthcare Remote Alarm Box */
 212	{ USB_DEVICE(0x1901, 0x0195) },	/* GE B850/B650/B450 CP2104 DP UART interface */
 213	{ USB_DEVICE(0x1901, 0x0196) },	/* GE B850 CP2105 DP UART interface */
 214	{ USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 M.2 Key E serial interface */
 215	{ USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 Display serial interface */
 216	{ USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */
 217	{ USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
 218	{ USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
 219	{ USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
 220	{ USB_DEVICE(0x1BA4, 0x0002) },	/* Silicon Labs 358x factory default */
 221	{ USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
 222	{ USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
 223	{ USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
 224	{ USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
 225	{ USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
 226	{ USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
 227	{ USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
 228	{ USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
 229	{ USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
 230	{ USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
 231	{ USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
 232	{ USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
 233	{ USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
 234	{ USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
 235	{ USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
 236	{ USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
 237	{ USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
 238	{ USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
 239	{ USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
 240	{ USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
 241	{ USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
 242	{ USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
 243	{ USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
 244	{ USB_DEVICE(0x2184, 0x0030) }, /* GW Instek GDM-834x Digital Multimeter */
 245	{ USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
 246	{ USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
 247	{ USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
 248	{ USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
 249	{ USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
 250	{ USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 251	{ } /* Terminating Entry */
 252};
 253
 254MODULE_DEVICE_TABLE(usb, id_table);
 255
 256struct cp210x_serial_private {
 257#ifdef CONFIG_GPIOLIB
 258	struct gpio_chip	gc;
 259	bool			gpio_registered;
 260	u16			gpio_pushpull;
 261	u16			gpio_altfunc;
 262	u16			gpio_input;
 263#endif
 264	u8			partnum;
 265	u32			fw_version;
 266	speed_t			min_speed;
 267	speed_t			max_speed;
 268	bool			use_actual_rate;
 269	bool			no_flow_control;
 270	bool			no_event_mode;
 271};
 272
 273enum cp210x_event_state {
 274	ES_DATA,
 275	ES_ESCAPE,
 276	ES_LSR,
 277	ES_LSR_DATA_0,
 278	ES_LSR_DATA_1,
 279	ES_MSR
 280};
 281
 282struct cp210x_port_private {
 283	u8			bInterfaceNumber;
 284	bool			event_mode;
 285	enum cp210x_event_state event_state;
 286	u8			lsr;
 287
 288	struct mutex		mutex;
 289	bool			crtscts;
 290	bool			dtr;
 291	bool			rts;
 292};
 293
 294static struct usb_serial_driver cp210x_device = {
 295	.driver = {
 296		.owner =	THIS_MODULE,
 297		.name =		"cp210x",
 298	},
 299	.id_table		= id_table,
 300	.num_ports		= 1,
 301	.bulk_in_size		= 256,
 302	.bulk_out_size		= 256,
 303	.open			= cp210x_open,
 304	.close			= cp210x_close,
 305	.break_ctl		= cp210x_break_ctl,
 306	.set_termios		= cp210x_set_termios,
 307	.tx_empty		= cp210x_tx_empty,
 308	.throttle		= usb_serial_generic_throttle,
 309	.unthrottle		= usb_serial_generic_unthrottle,
 310	.tiocmget		= cp210x_tiocmget,
 311	.tiocmset		= cp210x_tiocmset,
 312	.get_icount		= usb_serial_generic_get_icount,
 313	.attach			= cp210x_attach,
 314	.disconnect		= cp210x_disconnect,
 315	.release		= cp210x_release,
 316	.port_probe		= cp210x_port_probe,
 317	.port_remove		= cp210x_port_remove,
 318	.dtr_rts		= cp210x_dtr_rts,
 319	.process_read_urb	= cp210x_process_read_urb,
 320};
 321
 322static struct usb_serial_driver * const serial_drivers[] = {
 323	&cp210x_device, NULL
 324};
 325
 326/* Config request types */
 327#define REQTYPE_HOST_TO_INTERFACE	0x41
 328#define REQTYPE_INTERFACE_TO_HOST	0xc1
 329#define REQTYPE_HOST_TO_DEVICE	0x40
 330#define REQTYPE_DEVICE_TO_HOST	0xc0
 331
 332/* Config request codes */
 333#define CP210X_IFC_ENABLE	0x00
 334#define CP210X_SET_BAUDDIV	0x01
 335#define CP210X_GET_BAUDDIV	0x02
 336#define CP210X_SET_LINE_CTL	0x03
 337#define CP210X_GET_LINE_CTL	0x04
 338#define CP210X_SET_BREAK	0x05
 339#define CP210X_IMM_CHAR		0x06
 340#define CP210X_SET_MHS		0x07
 341#define CP210X_GET_MDMSTS	0x08
 342#define CP210X_SET_XON		0x09
 343#define CP210X_SET_XOFF		0x0A
 344#define CP210X_SET_EVENTMASK	0x0B
 345#define CP210X_GET_EVENTMASK	0x0C
 346#define CP210X_SET_CHAR		0x0D
 347#define CP210X_GET_CHARS	0x0E
 348#define CP210X_GET_PROPS	0x0F
 349#define CP210X_GET_COMM_STATUS	0x10
 350#define CP210X_RESET		0x11
 351#define CP210X_PURGE		0x12
 352#define CP210X_SET_FLOW		0x13
 353#define CP210X_GET_FLOW		0x14
 354#define CP210X_EMBED_EVENTS	0x15
 355#define CP210X_GET_EVENTSTATE	0x16
 356#define CP210X_SET_CHARS	0x19
 357#define CP210X_GET_BAUDRATE	0x1D
 358#define CP210X_SET_BAUDRATE	0x1E
 359#define CP210X_VENDOR_SPECIFIC	0xFF
 360
 361/* CP210X_IFC_ENABLE */
 362#define UART_ENABLE		0x0001
 363#define UART_DISABLE		0x0000
 364
 365/* CP210X_(SET|GET)_BAUDDIV */
 366#define BAUD_RATE_GEN_FREQ	0x384000
 367
 368/* CP210X_(SET|GET)_LINE_CTL */
 369#define BITS_DATA_MASK		0X0f00
 370#define BITS_DATA_5		0X0500
 371#define BITS_DATA_6		0X0600
 372#define BITS_DATA_7		0X0700
 373#define BITS_DATA_8		0X0800
 374#define BITS_DATA_9		0X0900
 375
 376#define BITS_PARITY_MASK	0x00f0
 377#define BITS_PARITY_NONE	0x0000
 378#define BITS_PARITY_ODD		0x0010
 379#define BITS_PARITY_EVEN	0x0020
 380#define BITS_PARITY_MARK	0x0030
 381#define BITS_PARITY_SPACE	0x0040
 382
 383#define BITS_STOP_MASK		0x000f
 384#define BITS_STOP_1		0x0000
 385#define BITS_STOP_1_5		0x0001
 386#define BITS_STOP_2		0x0002
 387
 388/* CP210X_SET_BREAK */
 389#define BREAK_ON		0x0001
 390#define BREAK_OFF		0x0000
 391
 392/* CP210X_(SET_MHS|GET_MDMSTS) */
 393#define CONTROL_DTR		0x0001
 394#define CONTROL_RTS		0x0002
 395#define CONTROL_CTS		0x0010
 396#define CONTROL_DSR		0x0020
 397#define CONTROL_RING		0x0040
 398#define CONTROL_DCD		0x0080
 399#define CONTROL_WRITE_DTR	0x0100
 400#define CONTROL_WRITE_RTS	0x0200
 401
 402/* CP210X_(GET|SET)_CHARS */
 403struct cp210x_special_chars {
 404	u8	bEofChar;
 405	u8	bErrorChar;
 406	u8	bBreakChar;
 407	u8	bEventChar;
 408	u8	bXonChar;
 409	u8	bXoffChar;
 410};
 411
 412/* CP210X_VENDOR_SPECIFIC values */
 413#define CP210X_GET_FW_VER	0x000E
 414#define CP210X_READ_2NCONFIG	0x000E
 415#define CP210X_GET_FW_VER_2N	0x0010
 416#define CP210X_READ_LATCH	0x00C2
 417#define CP210X_GET_PARTNUM	0x370B
 418#define CP210X_GET_PORTCONFIG	0x370C
 419#define CP210X_GET_DEVICEMODE	0x3711
 420#define CP210X_WRITE_LATCH	0x37E1
 421
 422/* Part number definitions */
 423#define CP210X_PARTNUM_CP2101	0x01
 424#define CP210X_PARTNUM_CP2102	0x02
 425#define CP210X_PARTNUM_CP2103	0x03
 426#define CP210X_PARTNUM_CP2104	0x04
 427#define CP210X_PARTNUM_CP2105	0x05
 428#define CP210X_PARTNUM_CP2108	0x08
 429#define CP210X_PARTNUM_CP2102N_QFN28	0x20
 430#define CP210X_PARTNUM_CP2102N_QFN24	0x21
 431#define CP210X_PARTNUM_CP2102N_QFN20	0x22
 432#define CP210X_PARTNUM_UNKNOWN	0xFF
 433
 434/* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
 435struct cp210x_comm_status {
 436	__le32   ulErrors;
 437	__le32   ulHoldReasons;
 438	__le32   ulAmountInInQueue;
 439	__le32   ulAmountInOutQueue;
 440	u8       bEofReceived;
 441	u8       bWaitForImmediate;
 442	u8       bReserved;
 443} __packed;
 444
 445/*
 446 * CP210X_PURGE - 16 bits passed in wValue of USB request.
 447 * SiLabs app note AN571 gives a strange description of the 4 bits:
 448 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
 449 * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
 450 */
 451#define PURGE_ALL		0x000f
 452
 453/* CP210X_EMBED_EVENTS */
 454#define CP210X_ESCCHAR		0xec
 455
 456#define CP210X_LSR_OVERRUN	BIT(1)
 457#define CP210X_LSR_PARITY	BIT(2)
 458#define CP210X_LSR_FRAME	BIT(3)
 459#define CP210X_LSR_BREAK	BIT(4)
 460
 461
 462/* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
 463struct cp210x_flow_ctl {
 464	__le32	ulControlHandshake;
 465	__le32	ulFlowReplace;
 466	__le32	ulXonLimit;
 467	__le32	ulXoffLimit;
 468};
 469
 470/* cp210x_flow_ctl::ulControlHandshake */
 471#define CP210X_SERIAL_DTR_MASK		GENMASK(1, 0)
 472#define CP210X_SERIAL_DTR_INACTIVE	(0 << 0)
 473#define CP210X_SERIAL_DTR_ACTIVE	(1 << 0)
 474#define CP210X_SERIAL_DTR_FLOW_CTL	(2 << 0)
 475#define CP210X_SERIAL_CTS_HANDSHAKE	BIT(3)
 476#define CP210X_SERIAL_DSR_HANDSHAKE	BIT(4)
 477#define CP210X_SERIAL_DCD_HANDSHAKE	BIT(5)
 478#define CP210X_SERIAL_DSR_SENSITIVITY	BIT(6)
 479
 480/* cp210x_flow_ctl::ulFlowReplace */
 481#define CP210X_SERIAL_AUTO_TRANSMIT	BIT(0)
 482#define CP210X_SERIAL_AUTO_RECEIVE	BIT(1)
 483#define CP210X_SERIAL_ERROR_CHAR	BIT(2)
 484#define CP210X_SERIAL_NULL_STRIPPING	BIT(3)
 485#define CP210X_SERIAL_BREAK_CHAR	BIT(4)
 486#define CP210X_SERIAL_RTS_MASK		GENMASK(7, 6)
 487#define CP210X_SERIAL_RTS_INACTIVE	(0 << 6)
 488#define CP210X_SERIAL_RTS_ACTIVE	(1 << 6)
 489#define CP210X_SERIAL_RTS_FLOW_CTL	(2 << 6)
 490#define CP210X_SERIAL_XOFF_CONTINUE	BIT(31)
 491
 492/* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
 493struct cp210x_pin_mode {
 494	u8	eci;
 495	u8	sci;
 496};
 497
 498#define CP210X_PIN_MODE_MODEM		0
 499#define CP210X_PIN_MODE_GPIO		BIT(0)
 500
 501/*
 502 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes
 503 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes.
 504 */
 505struct cp210x_dual_port_config {
 506	__le16	gpio_mode;
 507	u8	__pad0[2];
 508	__le16	reset_state;
 509	u8	__pad1[4];
 510	__le16	suspend_state;
 511	u8	sci_cfg;
 512	u8	eci_cfg;
 513	u8	device_cfg;
 514} __packed;
 515
 516/*
 517 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes
 518 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes.
 519 */
 520struct cp210x_single_port_config {
 521	__le16	gpio_mode;
 522	u8	__pad0[2];
 523	__le16	reset_state;
 524	u8	__pad1[4];
 525	__le16	suspend_state;
 526	u8	device_cfg;
 527} __packed;
 528
 529/* GPIO modes */
 530#define CP210X_SCI_GPIO_MODE_OFFSET	9
 531#define CP210X_SCI_GPIO_MODE_MASK	GENMASK(11, 9)
 532
 533#define CP210X_ECI_GPIO_MODE_OFFSET	2
 534#define CP210X_ECI_GPIO_MODE_MASK	GENMASK(3, 2)
 535
 536#define CP210X_GPIO_MODE_OFFSET		8
 537#define CP210X_GPIO_MODE_MASK		GENMASK(11, 8)
 538
 539/* CP2105 port configuration values */
 540#define CP2105_GPIO0_TXLED_MODE		BIT(0)
 541#define CP2105_GPIO1_RXLED_MODE		BIT(1)
 542#define CP2105_GPIO1_RS485_MODE		BIT(2)
 543
 544/* CP2104 port configuration values */
 545#define CP2104_GPIO0_TXLED_MODE		BIT(0)
 546#define CP2104_GPIO1_RXLED_MODE		BIT(1)
 547#define CP2104_GPIO2_RS485_MODE		BIT(2)
 548
 549struct cp210x_quad_port_state {
 550	__le16 gpio_mode_pb0;
 551	__le16 gpio_mode_pb1;
 552	__le16 gpio_mode_pb2;
 553	__le16 gpio_mode_pb3;
 554	__le16 gpio_mode_pb4;
 555
 556	__le16 gpio_lowpower_pb0;
 557	__le16 gpio_lowpower_pb1;
 558	__le16 gpio_lowpower_pb2;
 559	__le16 gpio_lowpower_pb3;
 560	__le16 gpio_lowpower_pb4;
 561
 562	__le16 gpio_latch_pb0;
 563	__le16 gpio_latch_pb1;
 564	__le16 gpio_latch_pb2;
 565	__le16 gpio_latch_pb3;
 566	__le16 gpio_latch_pb4;
 567};
 568
 569/*
 570 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0x49 bytes
 571 * on a CP2108 chip.
 572 *
 573 * See https://www.silabs.com/documents/public/application-notes/an978-cp210x-usb-to-uart-api-specification.pdf
 574 */
 575struct cp210x_quad_port_config {
 576	struct cp210x_quad_port_state reset_state;
 577	struct cp210x_quad_port_state suspend_state;
 578	u8 ipdelay_ifc[4];
 579	u8 enhancedfxn_ifc[4];
 580	u8 enhancedfxn_device;
 581	u8 extclkfreq[4];
 582} __packed;
 583
 584#define CP2108_EF_IFC_GPIO_TXLED		0x01
 585#define CP2108_EF_IFC_GPIO_RXLED		0x02
 586#define CP2108_EF_IFC_GPIO_RS485		0x04
 587#define CP2108_EF_IFC_GPIO_RS485_LOGIC		0x08
 588#define CP2108_EF_IFC_GPIO_CLOCK		0x10
 589#define CP2108_EF_IFC_DYNAMIC_SUSPEND		0x40
 590
 591/* CP2102N configuration array indices */
 592#define CP210X_2NCONFIG_CONFIG_VERSION_IDX	2
 593#define CP210X_2NCONFIG_GPIO_MODE_IDX		581
 594#define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX	587
 595#define CP210X_2NCONFIG_GPIO_CONTROL_IDX	600
 596
 597/* CP2102N QFN20 port configuration values */
 598#define CP2102N_QFN20_GPIO2_TXLED_MODE		BIT(2)
 599#define CP2102N_QFN20_GPIO3_RXLED_MODE		BIT(3)
 600#define CP2102N_QFN20_GPIO1_RS485_MODE		BIT(4)
 601#define CP2102N_QFN20_GPIO0_CLK_MODE		BIT(6)
 602
 603/*
 604 * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x02 bytes
 605 * for CP2102N, CP2103, CP2104 and CP2105.
 606 */
 607struct cp210x_gpio_write {
 608	u8	mask;
 609	u8	state;
 610};
 611
 612/*
 613 * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x04 bytes
 614 * for CP2108.
 
 
 
 615 */
 616struct cp210x_gpio_write16 {
 617	__le16	mask;
 618	__le16	state;
 619};
 620
 621/*
 622 * Helper to get interface number when we only have struct usb_serial.
 623 */
 624static u8 cp210x_interface_num(struct usb_serial *serial)
 625{
 626	struct usb_host_interface *cur_altsetting;
 627
 628	cur_altsetting = serial->interface->cur_altsetting;
 629
 630	return cur_altsetting->desc.bInterfaceNumber;
 631}
 632
 633/*
 634 * Reads a variable-sized block of CP210X_ registers, identified by req.
 635 * Returns data into buf in native USB byte order.
 636 */
 637static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
 638		void *buf, int bufsize)
 639{
 640	struct usb_serial *serial = port->serial;
 641	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 642	int result;
 
 643
 
 
 644
 645	result = usb_control_msg_recv(serial->dev, 0, req,
 646			REQTYPE_INTERFACE_TO_HOST, 0,
 647			port_priv->bInterfaceNumber, buf, bufsize,
 648			USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
 649	if (result) {
 650		dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
 651				req, bufsize, result);
 652		return result;
 653	}
 654
 655	return 0;
 656}
 
 
 
 
 
 
 
 657
 658/*
 659 * Reads any 8-bit CP210X_ register identified by req.
 660 */
 661static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
 662{
 663	return cp210x_read_reg_block(port, req, val, sizeof(*val));
 664}
 665
 666/*
 667 * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
 668 * Returns data into buf in native USB byte order.
 669 */
 670static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
 671				    void *buf, int bufsize)
 672{
 673	int result;
 674
 675	result = usb_control_msg_recv(serial->dev, 0, CP210X_VENDOR_SPECIFIC,
 676			type, val, cp210x_interface_num(serial), buf, bufsize,
 677			USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
 678	if (result) {
 679		dev_err(&serial->interface->dev,
 680			"failed to get vendor val 0x%04x size %d: %d\n", val,
 681			bufsize, result);
 682		return result;
 683	}
 684
 685	return 0;
 686}
 687
 688/*
 689 * Writes any 16-bit CP210X_ register (req) whose value is passed
 690 * entirely in the wValue field of the USB request.
 
 
 691 */
 692static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
 
 693{
 694	struct usb_serial *serial = port->serial;
 695	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 696	int result;
 
 
 
 
 
 
 
 
 
 
 
 
 697
 698	result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 699			req, REQTYPE_HOST_TO_INTERFACE, val,
 700			port_priv->bInterfaceNumber, NULL, 0,
 701			USB_CTRL_SET_TIMEOUT);
 702	if (result < 0) {
 703		dev_err(&port->dev, "failed set request 0x%x status: %d\n",
 704				req, result);
 
 
 
 
 
 705	}
 706
 707	return result;
 708}
 709
 710/*
 711 * Writes a variable-sized block of CP210X_ registers, identified by req.
 712 * Data in buf must be in native USB byte order.
 713 */
 714static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
 715		void *buf, int bufsize)
 716{
 717	struct usb_serial *serial = port->serial;
 718	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 719	int result;
 720
 721	result = usb_control_msg_send(serial->dev, 0, req,
 722			REQTYPE_HOST_TO_INTERFACE, 0,
 723			port_priv->bInterfaceNumber, buf, bufsize,
 724			USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
 725	if (result) {
 726		dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
 727				req, bufsize, result);
 728		return result;
 729	}
 730
 731	return 0;
 732}
 733
 734/*
 735 * Writes any 32-bit CP210X_ register identified by req.
 
 
 736 */
 737static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
 
 738{
 739	__le32 le32_val;
 740
 741	le32_val = cpu_to_le32(val);
 742
 743	return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
 744}
 745
 746#ifdef CONFIG_GPIOLIB
 747/*
 748 * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
 749 * Data in buf must be in native USB byte order.
 750 */
 751static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
 752				     u16 val, void *buf, int bufsize)
 753{
 754	int result;
 755
 756	result = usb_control_msg_send(serial->dev, 0, CP210X_VENDOR_SPECIFIC,
 757			type, val, cp210x_interface_num(serial), buf, bufsize,
 758			USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
 759	if (result) {
 760		dev_err(&serial->interface->dev,
 761			"failed to set vendor val 0x%04x size %d: %d\n", val,
 762			bufsize, result);
 763		return result;
 764	}
 765
 766	return 0;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 767}
 768#endif
 769
 770static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 771{
 772	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 773	int result;
 774
 775	result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
 
 776	if (result) {
 777		dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
 778		return result;
 779	}
 780
 781	if (tty)
 782		cp210x_set_termios(tty, port, NULL);
 783
 784	result = usb_serial_generic_open(tty, port);
 785	if (result)
 786		goto err_disable;
 787
 788	return 0;
 789
 790err_disable:
 791	cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 792	port_priv->event_mode = false;
 793
 794	return result;
 795}
 796
 797static void cp210x_close(struct usb_serial_port *port)
 798{
 799	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 800
 801	usb_serial_generic_close(port);
 802
 803	/* Clear both queues; cp2108 needs this to avoid an occasional hang */
 804	cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
 805
 806	cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 807
 808	/* Disabling the interface disables event-insertion mode. */
 809	port_priv->event_mode = false;
 810}
 811
 812static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag)
 
 
 
 
 
 
 
 813{
 814	if (lsr & CP210X_LSR_BREAK) {
 815		port->icount.brk++;
 816		*flag = TTY_BREAK;
 817	} else if (lsr & CP210X_LSR_PARITY) {
 818		port->icount.parity++;
 819		*flag = TTY_PARITY;
 820	} else if (lsr & CP210X_LSR_FRAME) {
 821		port->icount.frame++;
 822		*flag = TTY_FRAME;
 823	}
 824
 825	if (lsr & CP210X_LSR_OVERRUN) {
 826		port->icount.overrun++;
 827		tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
 
 
 
 
 
 828	}
 829}
 830
 831static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag)
 
 
 
 
 
 832{
 833	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 
 
 
 834
 835	switch (port_priv->event_state) {
 836	case ES_DATA:
 837		if (*ch == CP210X_ESCCHAR) {
 838			port_priv->event_state = ES_ESCAPE;
 839			break;
 840		}
 841		return false;
 842	case ES_ESCAPE:
 843		switch (*ch) {
 844		case 0:
 845			dev_dbg(&port->dev, "%s - escape char\n", __func__);
 846			*ch = CP210X_ESCCHAR;
 847			port_priv->event_state = ES_DATA;
 848			return false;
 849		case 1:
 850			port_priv->event_state = ES_LSR_DATA_0;
 851			break;
 852		case 2:
 853			port_priv->event_state = ES_LSR;
 854			break;
 855		case 3:
 856			port_priv->event_state = ES_MSR;
 857			break;
 858		default:
 859			dev_err(&port->dev, "malformed event 0x%02x\n", *ch);
 860			port_priv->event_state = ES_DATA;
 861			break;
 862		}
 863		break;
 864	case ES_LSR_DATA_0:
 865		port_priv->lsr = *ch;
 866		port_priv->event_state = ES_LSR_DATA_1;
 867		break;
 868	case ES_LSR_DATA_1:
 869		dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n",
 870				__func__, port_priv->lsr, *ch);
 871		cp210x_process_lsr(port, port_priv->lsr, flag);
 872		port_priv->event_state = ES_DATA;
 873		return false;
 874	case ES_LSR:
 875		dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch);
 876		port_priv->lsr = *ch;
 877		cp210x_process_lsr(port, port_priv->lsr, flag);
 878		port_priv->event_state = ES_DATA;
 879		break;
 880	case ES_MSR:
 881		dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch);
 882		/* unimplemented */
 883		port_priv->event_state = ES_DATA;
 
 
 
 
 
 
 
 
 
 
 
 
 
 884		break;
 885	}
 886
 887	return true;
 888}
 889
 890static void cp210x_process_read_urb(struct urb *urb)
 891{
 892	struct usb_serial_port *port = urb->context;
 893	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 894	unsigned char *ch = urb->transfer_buffer;
 895	char flag;
 896	int i;
 897
 898	if (!urb->actual_length)
 899		return;
 900
 901	if (port_priv->event_mode) {
 902		for (i = 0; i < urb->actual_length; i++, ch++) {
 903			flag = TTY_NORMAL;
 904
 905			if (cp210x_process_char(port, ch, &flag))
 906				continue;
 907
 908			tty_insert_flip_char(&port->port, *ch, flag);
 909		}
 910	} else {
 911		tty_insert_flip_string(&port->port, ch, urb->actual_length);
 
 
 
 
 912	}
 913	tty_flip_buffer_push(&port->port);
 914}
 915
 916/*
 917 * Read how many bytes are waiting in the TX queue.
 918 */
 919static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
 920		u32 *count)
 921{
 922	struct usb_serial *serial = port->serial;
 923	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 924	struct cp210x_comm_status sts;
 925	int result;
 926
 927	result = usb_control_msg_recv(serial->dev, 0, CP210X_GET_COMM_STATUS,
 928			REQTYPE_INTERFACE_TO_HOST, 0,
 929			port_priv->bInterfaceNumber, &sts, sizeof(sts),
 930			USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
 931	if (result) {
 932		dev_err(&port->dev, "failed to get comm status: %d\n", result);
 933		return result;
 
 
 
 
 
 
 
 
 
 
 
 
 934	}
 935
 936	*count = le32_to_cpu(sts.ulAmountInOutQueue);
 937
 938	return 0;
 939}
 940
 941static bool cp210x_tx_empty(struct usb_serial_port *port)
 942{
 943	int err;
 944	u32 count;
 945
 946	err = cp210x_get_tx_queue_byte_count(port, &count);
 947	if (err)
 948		return true;
 949
 950	return !count;
 951}
 952
 953struct cp210x_rate {
 954	speed_t rate;
 955	speed_t high;
 956};
 957
 958static const struct cp210x_rate cp210x_an205_table1[] = {
 959	{ 300, 300 },
 960	{ 600, 600 },
 961	{ 1200, 1200 },
 962	{ 1800, 1800 },
 963	{ 2400, 2400 },
 964	{ 4000, 4000 },
 965	{ 4800, 4803 },
 966	{ 7200, 7207 },
 967	{ 9600, 9612 },
 968	{ 14400, 14428 },
 969	{ 16000, 16062 },
 970	{ 19200, 19250 },
 971	{ 28800, 28912 },
 972	{ 38400, 38601 },
 973	{ 51200, 51558 },
 974	{ 56000, 56280 },
 975	{ 57600, 58053 },
 976	{ 64000, 64111 },
 977	{ 76800, 77608 },
 978	{ 115200, 117028 },
 979	{ 128000, 129347 },
 980	{ 153600, 156868 },
 981	{ 230400, 237832 },
 982	{ 250000, 254234 },
 983	{ 256000, 273066 },
 984	{ 460800, 491520 },
 985	{ 500000, 567138 },
 986	{ 576000, 670254 },
 987	{ 921600, UINT_MAX }
 988};
 989
 990/*
 991 * Quantises the baud rate as per AN205 Table 1
 992 */
 993static speed_t cp210x_get_an205_rate(speed_t baud)
 994{
 995	int i;
 996
 997	for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) {
 998		if (baud <= cp210x_an205_table1[i].high)
 999			break;
1000	}
1001
1002	return cp210x_an205_table1[i].rate;
1003}
1004
1005static speed_t cp210x_get_actual_rate(speed_t baud)
1006{
1007	unsigned int prescale = 1;
1008	unsigned int div;
1009
1010	if (baud <= 365)
1011		prescale = 4;
1012
1013	div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud);
1014	baud = 48000000 / (2 * prescale * div);
1015
1016	return baud;
1017}
1018
1019/*
1020 * CP2101 supports the following baud rates:
1021 *
1022 *	300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1023 *	38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1024 *
1025 * CP2102 and CP2103 support the following additional rates:
1026 *
1027 *	4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1028 *	576000
1029 *
1030 * The device will map a requested rate to a supported one, but the result
1031 * of requests for rates greater than 1053257 is undefined (see AN205).
1032 *
1033 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1034 * respectively, with an error less than 1%. The actual rates are determined
1035 * by
1036 *
1037 *	div = round(freq / (2 x prescale x request))
1038 *	actual = freq / (2 x prescale x div)
1039 *
1040 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1041 * or 1 otherwise.
1042 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1043 * otherwise.
1044 */
1045static void cp210x_change_speed(struct tty_struct *tty,
1046				struct usb_serial_port *port,
1047				const struct ktermios *old_termios)
1048{
1049	struct usb_serial *serial = port->serial;
1050	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1051	u32 baud;
1052
1053	if (tty->termios.c_ospeed == 0)
1054		return;
1055
1056	/*
1057	 * This maps the requested rate to the actual rate, a valid rate on
1058	 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed].
 
1059	 */
1060	baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed);
1061
1062	if (priv->use_actual_rate)
1063		baud = cp210x_get_actual_rate(baud);
1064	else if (baud < 1000000)
1065		baud = cp210x_get_an205_rate(baud);
1066
1067	dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1068	if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
 
1069		dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1070		if (old_termios)
1071			baud = old_termios->c_ospeed;
1072		else
1073			baud = 9600;
1074	}
1075
1076	tty_encode_baud_rate(tty, baud, baud);
1077}
1078
1079static void cp210x_enable_event_mode(struct usb_serial_port *port)
1080{
1081	struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1082	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1083	int ret;
1084
1085	if (port_priv->event_mode)
1086		return;
1087
1088	if (priv->no_event_mode)
1089		return;
1090
1091	port_priv->event_state = ES_DATA;
1092	port_priv->event_mode = true;
1093
1094	ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR);
1095	if (ret) {
1096		dev_err(&port->dev, "failed to enable events: %d\n", ret);
1097		port_priv->event_mode = false;
1098	}
1099}
1100
1101static void cp210x_disable_event_mode(struct usb_serial_port *port)
1102{
1103	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1104	int ret;
1105
1106	if (!port_priv->event_mode)
1107		return;
1108
1109	ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0);
1110	if (ret) {
1111		dev_err(&port->dev, "failed to disable events: %d\n", ret);
1112		return;
1113	}
1114
1115	port_priv->event_mode = false;
1116}
1117
1118static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b)
1119{
1120	bool iflag_change, cc_change;
1121
1122	iflag_change = ((a->c_iflag ^ b->c_iflag) & (INPCK | IXON | IXOFF));
1123	cc_change = a->c_cc[VSTART] != b->c_cc[VSTART] ||
1124			a->c_cc[VSTOP] != b->c_cc[VSTOP];
1125
1126	return tty_termios_hw_change(a, b) || iflag_change || cc_change;
1127}
1128
1129static void cp210x_set_flow_control(struct tty_struct *tty,
1130				    struct usb_serial_port *port,
1131				    const struct ktermios *old_termios)
1132{
1133	struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1134	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1135	struct cp210x_special_chars chars;
1136	struct cp210x_flow_ctl flow_ctl;
1137	u32 flow_repl;
1138	u32 ctl_hs;
1139	bool crtscts;
1140	int ret;
1141
1142	/*
1143	 * Some CP2102N interpret ulXonLimit as ulFlowReplace (erratum
1144	 * CP2102N_E104). Report back that flow control is not supported.
1145	 */
1146	if (priv->no_flow_control) {
1147		tty->termios.c_cflag &= ~CRTSCTS;
1148		tty->termios.c_iflag &= ~(IXON | IXOFF);
1149	}
1150
1151	if (tty->termios.c_ospeed != 0 &&
1152			old_termios && old_termios->c_ospeed != 0 &&
1153			C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) &&
1154			I_IXON(tty) == (old_termios->c_iflag & IXON) &&
1155			I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) &&
1156			START_CHAR(tty) == old_termios->c_cc[VSTART] &&
1157			STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) {
1158		return;
1159	}
1160
1161	if (I_IXON(tty) || I_IXOFF(tty)) {
1162		memset(&chars, 0, sizeof(chars));
1163
1164		chars.bXonChar = START_CHAR(tty);
1165		chars.bXoffChar = STOP_CHAR(tty);
1166
1167		ret = cp210x_write_reg_block(port, CP210X_SET_CHARS, &chars,
1168				sizeof(chars));
1169		if (ret) {
1170			dev_err(&port->dev, "failed to set special chars: %d\n",
1171					ret);
1172		}
1173	}
1174
1175	mutex_lock(&port_priv->mutex);
1176
1177	if (tty->termios.c_ospeed == 0) {
1178		port_priv->dtr = false;
1179		port_priv->rts = false;
1180	} else if (old_termios && old_termios->c_ospeed == 0) {
1181		port_priv->dtr = true;
1182		port_priv->rts = true;
1183	}
1184
1185	ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1186			sizeof(flow_ctl));
1187	if (ret)
1188		goto out_unlock;
1189
1190	ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1191	flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1192
1193	ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1194	ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1195	ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1196	ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1197	if (port_priv->dtr)
1198		ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
1199	else
1200		ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
1201
1202	flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1203	if (C_CRTSCTS(tty)) {
1204		ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1205		if (port_priv->rts)
1206			flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
1207		else
1208			flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1209		crtscts = true;
1210	} else {
1211		ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1212		if (port_priv->rts)
1213			flow_repl |= CP210X_SERIAL_RTS_ACTIVE;
1214		else
1215			flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1216		crtscts = false;
1217	}
1218
1219	if (I_IXOFF(tty)) {
1220		flow_repl |= CP210X_SERIAL_AUTO_RECEIVE;
1221
1222		flow_ctl.ulXonLimit = cpu_to_le32(128);
1223		flow_ctl.ulXoffLimit = cpu_to_le32(128);
1224	} else {
1225		flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE;
1226	}
1227
1228	if (I_IXON(tty))
1229		flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT;
1230	else
1231		flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT;
1232
1233	dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__,
1234			ctl_hs, flow_repl);
1235
1236	flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1237	flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1238
1239	ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1240			sizeof(flow_ctl));
1241	if (ret)
1242		goto out_unlock;
1243
1244	port_priv->crtscts = crtscts;
1245out_unlock:
1246	mutex_unlock(&port_priv->mutex);
1247}
1248
1249static void cp210x_set_termios(struct tty_struct *tty,
1250		               struct usb_serial_port *port,
1251		               const struct ktermios *old_termios)
1252{
1253	struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1254	u16 bits;
1255	int ret;
1256
1257	if (old_termios && !cp210x_termios_change(&tty->termios, old_termios) &&
1258			tty->termios.c_ospeed != 0)
1259		return;
1260
1261	if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed)
 
 
 
1262		cp210x_change_speed(tty, port, old_termios);
1263
1264	/* CP2101 only supports CS8, 1 stop bit and non-stick parity. */
1265	if (priv->partnum == CP210X_PARTNUM_CP2101) {
1266		tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR);
1267		tty->termios.c_cflag |= CS8;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1268	}
1269
1270	bits = 0;
1271
1272	switch (C_CSIZE(tty)) {
1273	case CS5:
1274		bits |= BITS_DATA_5;
1275		break;
1276	case CS6:
1277		bits |= BITS_DATA_6;
1278		break;
1279	case CS7:
1280		bits |= BITS_DATA_7;
1281		break;
1282	case CS8:
1283	default:
1284		bits |= BITS_DATA_8;
1285		break;
 
 
 
 
 
 
 
 
 
1286	}
1287
1288	if (C_PARENB(tty)) {
1289		if (C_CMSPAR(tty)) {
1290			if (C_PARODD(tty))
1291				bits |= BITS_PARITY_MARK;
1292			else
1293				bits |= BITS_PARITY_SPACE;
1294		} else {
1295			if (C_PARODD(tty))
1296				bits |= BITS_PARITY_ODD;
1297			else
1298				bits |= BITS_PARITY_EVEN;
1299		}
 
 
1300	}
1301
1302	if (C_CSTOPB(tty))
1303		bits |= BITS_STOP_2;
1304	else
1305		bits |= BITS_STOP_1;
1306
1307	ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1308	if (ret)
1309		dev_err(&port->dev, "failed to set line control: %d\n", ret);
 
 
 
 
 
 
 
 
 
1310
1311	cp210x_set_flow_control(tty, port, old_termios);
 
 
 
 
1312
1313	/*
1314	 * Enable event-insertion mode only if input parity checking is
1315	 * enabled for now.
1316	 */
1317	if (I_INPCK(tty))
1318		cp210x_enable_event_mode(port);
1319	else
1320		cp210x_disable_event_mode(port);
1321}
1322
1323static int cp210x_tiocmset(struct tty_struct *tty,
1324		unsigned int set, unsigned int clear)
1325{
1326	struct usb_serial_port *port = tty->driver_data;
1327	return cp210x_tiocmset_port(port, set, clear);
1328}
1329
1330static int cp210x_tiocmset_port(struct usb_serial_port *port,
1331		unsigned int set, unsigned int clear)
1332{
1333	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1334	struct cp210x_flow_ctl flow_ctl;
1335	u32 ctl_hs, flow_repl;
1336	u16 control = 0;
1337	int ret;
1338
1339	mutex_lock(&port_priv->mutex);
1340
1341	if (set & TIOCM_RTS) {
1342		port_priv->rts = true;
1343		control |= CONTROL_RTS;
1344		control |= CONTROL_WRITE_RTS;
1345	}
1346	if (set & TIOCM_DTR) {
1347		port_priv->dtr = true;
1348		control |= CONTROL_DTR;
1349		control |= CONTROL_WRITE_DTR;
1350	}
1351	if (clear & TIOCM_RTS) {
1352		port_priv->rts = false;
1353		control &= ~CONTROL_RTS;
1354		control |= CONTROL_WRITE_RTS;
1355	}
1356	if (clear & TIOCM_DTR) {
1357		port_priv->dtr = false;
1358		control &= ~CONTROL_DTR;
1359		control |= CONTROL_WRITE_DTR;
1360	}
1361
1362	/*
1363	 * Use SET_FLOW to set DTR and enable/disable auto-RTS when hardware
1364	 * flow control is enabled.
1365	 */
1366	if (port_priv->crtscts && control & CONTROL_WRITE_RTS) {
1367		ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1368				sizeof(flow_ctl));
1369		if (ret)
1370			goto out_unlock;
1371
1372		ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1373		flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1374
1375		ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1376		if (port_priv->dtr)
1377			ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
1378		else
1379			ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
1380
1381		flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1382		if (port_priv->rts)
1383			flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
1384		else
1385			flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1386
1387		flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1388		flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1389
1390		dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n",
1391				__func__, ctl_hs, flow_repl);
1392
1393		ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1394				sizeof(flow_ctl));
1395	} else {
1396		dev_dbg(&port->dev, "%s - control = 0x%04x\n", __func__, control);
1397
1398		ret = cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1399	}
1400out_unlock:
1401	mutex_unlock(&port_priv->mutex);
1402
1403	return ret;
1404}
1405
1406static void cp210x_dtr_rts(struct usb_serial_port *port, int on)
1407{
1408	if (on)
1409		cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0);
1410	else
1411		cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS);
1412}
1413
1414static int cp210x_tiocmget(struct tty_struct *tty)
1415{
1416	struct usb_serial_port *port = tty->driver_data;
1417	u8 control;
1418	int result;
1419
1420	result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1421	if (result)
1422		return result;
1423
1424	result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1425		|((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1426		|((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1427		|((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1428		|((control & CONTROL_RING)? TIOCM_RI  : 0)
1429		|((control & CONTROL_DCD) ? TIOCM_CD  : 0);
1430
1431	dev_dbg(&port->dev, "%s - control = 0x%02x\n", __func__, control);
1432
1433	return result;
1434}
1435
1436static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1437{
1438	struct usb_serial_port *port = tty->driver_data;
1439	u16 state;
1440
1441	if (break_state == 0)
1442		state = BREAK_OFF;
1443	else
1444		state = BREAK_ON;
1445	dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1446		state == BREAK_OFF ? "off" : "on");
1447	cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1448}
1449
1450#ifdef CONFIG_GPIOLIB
1451static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1452{
1453	struct usb_serial *serial = gpiochip_get_data(gc);
1454	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1455	u8 req_type;
1456	u16 mask;
1457	int result;
1458	int len;
1459
1460	result = usb_autopm_get_interface(serial->interface);
1461	if (result)
1462		return result;
1463
1464	switch (priv->partnum) {
1465	case CP210X_PARTNUM_CP2105:
1466		req_type = REQTYPE_INTERFACE_TO_HOST;
1467		len = 1;
1468		break;
1469	case CP210X_PARTNUM_CP2108:
1470		req_type = REQTYPE_INTERFACE_TO_HOST;
1471		len = 2;
1472		break;
1473	default:
1474		req_type = REQTYPE_DEVICE_TO_HOST;
1475		len = 1;
1476		break;
1477	}
1478
1479	mask = 0;
1480	result = cp210x_read_vendor_block(serial, req_type, CP210X_READ_LATCH,
1481					  &mask, len);
1482
1483	usb_autopm_put_interface(serial->interface);
1484
1485	if (result < 0)
1486		return result;
1487
1488	le16_to_cpus(&mask);
1489
1490	return !!(mask & BIT(gpio));
1491}
1492
1493static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1494{
1495	struct usb_serial *serial = gpiochip_get_data(gc);
1496	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1497	struct cp210x_gpio_write16 buf16;
1498	struct cp210x_gpio_write buf;
1499	u16 mask, state;
1500	u16 wIndex;
1501	int result;
1502
1503	if (value == 1)
1504		state = BIT(gpio);
1505	else
1506		state = 0;
1507
1508	mask = BIT(gpio);
1509
1510	result = usb_autopm_get_interface(serial->interface);
1511	if (result)
1512		goto out;
1513
1514	switch (priv->partnum) {
1515	case CP210X_PARTNUM_CP2105:
1516		buf.mask = (u8)mask;
1517		buf.state = (u8)state;
1518		result = cp210x_write_vendor_block(serial,
1519						   REQTYPE_HOST_TO_INTERFACE,
1520						   CP210X_WRITE_LATCH, &buf,
1521						   sizeof(buf));
1522		break;
1523	case CP210X_PARTNUM_CP2108:
1524		buf16.mask = cpu_to_le16(mask);
1525		buf16.state = cpu_to_le16(state);
1526		result = cp210x_write_vendor_block(serial,
1527						   REQTYPE_HOST_TO_INTERFACE,
1528						   CP210X_WRITE_LATCH, &buf16,
1529						   sizeof(buf16));
1530		break;
1531	default:
1532		wIndex = state << 8 | mask;
1533		result = usb_control_msg(serial->dev,
1534					 usb_sndctrlpipe(serial->dev, 0),
1535					 CP210X_VENDOR_SPECIFIC,
1536					 REQTYPE_HOST_TO_DEVICE,
1537					 CP210X_WRITE_LATCH,
1538					 wIndex,
1539					 NULL, 0, USB_CTRL_SET_TIMEOUT);
1540		break;
1541	}
1542
1543	usb_autopm_put_interface(serial->interface);
1544out:
1545	if (result < 0) {
1546		dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n",
1547				result);
1548	}
1549}
1550
1551static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1552{
1553	struct usb_serial *serial = gpiochip_get_data(gc);
1554	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1555
1556	return priv->gpio_input & BIT(gpio);
1557}
1558
1559static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1560{
1561	struct usb_serial *serial = gpiochip_get_data(gc);
1562	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1563
1564	if (priv->partnum == CP210X_PARTNUM_CP2105) {
1565		/* hardware does not support an input mode */
1566		return -ENOTSUPP;
1567	}
1568
1569	/* push-pull pins cannot be changed to be inputs */
1570	if (priv->gpio_pushpull & BIT(gpio))
1571		return -EINVAL;
1572
1573	/* make sure to release pin if it is being driven low */
1574	cp210x_gpio_set(gc, gpio, 1);
1575
1576	priv->gpio_input |= BIT(gpio);
1577
1578	return 0;
1579}
1580
1581static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1582					int value)
1583{
1584	struct usb_serial *serial = gpiochip_get_data(gc);
1585	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1586
1587	priv->gpio_input &= ~BIT(gpio);
1588	cp210x_gpio_set(gc, gpio, value);
1589
1590	return 0;
1591}
1592
1593static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1594				  unsigned long config)
1595{
1596	struct usb_serial *serial = gpiochip_get_data(gc);
1597	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1598	enum pin_config_param param = pinconf_to_config_param(config);
1599
1600	/* Succeed only if in correct mode (this can't be set at runtime) */
1601	if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1602	    (priv->gpio_pushpull & BIT(gpio)))
1603		return 0;
1604
1605	if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1606	    !(priv->gpio_pushpull & BIT(gpio)))
1607		return 0;
1608
1609	return -ENOTSUPP;
1610}
1611
1612static int cp210x_gpio_init_valid_mask(struct gpio_chip *gc,
1613		unsigned long *valid_mask, unsigned int ngpios)
1614{
1615	struct usb_serial *serial = gpiochip_get_data(gc);
1616	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1617	struct device *dev = &serial->interface->dev;
1618	unsigned long altfunc_mask = priv->gpio_altfunc;
1619
1620	bitmap_complement(valid_mask, &altfunc_mask, ngpios);
1621
1622	if (bitmap_empty(valid_mask, ngpios))
1623		dev_dbg(dev, "no pin configured for GPIO\n");
1624	else
1625		dev_dbg(dev, "GPIO.%*pbl configured for GPIO\n", ngpios,
1626				valid_mask);
1627	return 0;
1628}
1629
1630/*
1631 * This function is for configuring GPIO using shared pins, where other signals
1632 * are made unavailable by configuring the use of GPIO. This is believed to be
1633 * only applicable to the cp2105 at this point, the other devices supported by
1634 * this driver that provide GPIO do so in a way that does not impact other
1635 * signals and are thus expected to have very different initialisation.
1636 */
1637static int cp2105_gpioconf_init(struct usb_serial *serial)
1638{
1639	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1640	struct cp210x_pin_mode mode;
1641	struct cp210x_dual_port_config config;
1642	u8 intf_num = cp210x_interface_num(serial);
1643	u8 iface_config;
1644	int result;
1645
1646	result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1647					  CP210X_GET_DEVICEMODE, &mode,
1648					  sizeof(mode));
1649	if (result < 0)
1650		return result;
1651
1652	result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1653					  CP210X_GET_PORTCONFIG, &config,
1654					  sizeof(config));
1655	if (result < 0)
1656		return result;
1657
1658	/*  2 banks of GPIO - One for the pins taken from each serial port */
1659	if (intf_num == 0) {
1660		priv->gc.ngpio = 2;
1661
1662		if (mode.eci == CP210X_PIN_MODE_MODEM) {
1663			/* mark all GPIOs of this interface as reserved */
1664			priv->gpio_altfunc = 0xff;
1665			return 0;
1666		}
1667
1668		iface_config = config.eci_cfg;
1669		priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1670						CP210X_ECI_GPIO_MODE_MASK) >>
1671						CP210X_ECI_GPIO_MODE_OFFSET);
1672	} else if (intf_num == 1) {
1673		priv->gc.ngpio = 3;
1674
1675		if (mode.sci == CP210X_PIN_MODE_MODEM) {
1676			/* mark all GPIOs of this interface as reserved */
1677			priv->gpio_altfunc = 0xff;
1678			return 0;
1679		}
1680
1681		iface_config = config.sci_cfg;
1682		priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1683						CP210X_SCI_GPIO_MODE_MASK) >>
1684						CP210X_SCI_GPIO_MODE_OFFSET);
1685	} else {
1686		return -ENODEV;
1687	}
1688
1689	/* mark all pins which are not in GPIO mode */
1690	if (iface_config & CP2105_GPIO0_TXLED_MODE)	/* GPIO 0 */
1691		priv->gpio_altfunc |= BIT(0);
1692	if (iface_config & (CP2105_GPIO1_RXLED_MODE |	/* GPIO 1 */
1693			CP2105_GPIO1_RS485_MODE))
1694		priv->gpio_altfunc |= BIT(1);
1695
1696	/* driver implementation for CP2105 only supports outputs */
1697	priv->gpio_input = 0;
1698
1699	return 0;
1700}
1701
1702static int cp2104_gpioconf_init(struct usb_serial *serial)
1703{
1704	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1705	struct cp210x_single_port_config config;
1706	u8 iface_config;
1707	u8 gpio_latch;
1708	int result;
1709	u8 i;
1710
1711	result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1712					  CP210X_GET_PORTCONFIG, &config,
1713					  sizeof(config));
1714	if (result < 0)
1715		return result;
1716
1717	priv->gc.ngpio = 4;
1718
1719	iface_config = config.device_cfg;
1720	priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1721					CP210X_GPIO_MODE_MASK) >>
1722					CP210X_GPIO_MODE_OFFSET);
1723	gpio_latch = (u8)((le16_to_cpu(config.reset_state) &
1724					CP210X_GPIO_MODE_MASK) >>
1725					CP210X_GPIO_MODE_OFFSET);
1726
1727	/* mark all pins which are not in GPIO mode */
1728	if (iface_config & CP2104_GPIO0_TXLED_MODE)	/* GPIO 0 */
1729		priv->gpio_altfunc |= BIT(0);
1730	if (iface_config & CP2104_GPIO1_RXLED_MODE)	/* GPIO 1 */
1731		priv->gpio_altfunc |= BIT(1);
1732	if (iface_config & CP2104_GPIO2_RS485_MODE)	/* GPIO 2 */
1733		priv->gpio_altfunc |= BIT(2);
1734
1735	/*
1736	 * Like CP2102N, CP2104 has also no strict input and output pin
1737	 * modes.
1738	 * Do the same input mode emulation as CP2102N.
1739	 */
1740	for (i = 0; i < priv->gc.ngpio; ++i) {
1741		/*
1742		 * Set direction to "input" iff pin is open-drain and reset
1743		 * value is 1.
1744		 */
1745		if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1746			priv->gpio_input |= BIT(i);
1747	}
1748
1749	return 0;
1750}
1751
1752static int cp2108_gpio_init(struct usb_serial *serial)
1753{
1754	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1755	struct cp210x_quad_port_config config;
1756	u16 gpio_latch;
1757	int result;
1758	u8 i;
1759
1760	result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1761					  CP210X_GET_PORTCONFIG, &config,
1762					  sizeof(config));
1763	if (result < 0)
1764		return result;
1765
1766	priv->gc.ngpio = 16;
1767	priv->gpio_pushpull = le16_to_cpu(config.reset_state.gpio_mode_pb1);
1768	gpio_latch = le16_to_cpu(config.reset_state.gpio_latch_pb1);
1769
1770	/*
1771	 * Mark all pins which are not in GPIO mode.
1772	 *
1773	 * Refer to table 9.1 "GPIO Mode alternate Functions" in the datasheet:
1774	 * https://www.silabs.com/documents/public/data-sheets/cp2108-datasheet.pdf
1775	 *
1776	 * Alternate functions of GPIO0 to GPIO3 are determine by enhancedfxn_ifc[0]
1777	 * and the similarly for the other pins; enhancedfxn_ifc[1]: GPIO4 to GPIO7,
1778	 * enhancedfxn_ifc[2]: GPIO8 to GPIO11, enhancedfxn_ifc[3]: GPIO12 to GPIO15.
1779	 */
1780	for (i = 0; i < 4; i++) {
1781		if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_TXLED)
1782			priv->gpio_altfunc |= BIT(i * 4);
1783		if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RXLED)
1784			priv->gpio_altfunc |= BIT((i * 4) + 1);
1785		if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RS485)
1786			priv->gpio_altfunc |= BIT((i * 4) + 2);
1787		if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_CLOCK)
1788			priv->gpio_altfunc |= BIT((i * 4) + 3);
1789	}
1790
1791	/*
1792	 * Like CP2102N, CP2108 has also no strict input and output pin
1793	 * modes. Do the same input mode emulation as CP2102N.
1794	 */
1795	for (i = 0; i < priv->gc.ngpio; ++i) {
1796		/*
1797		 * Set direction to "input" iff pin is open-drain and reset
1798		 * value is 1.
1799		 */
1800		if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1801			priv->gpio_input |= BIT(i);
1802	}
1803
1804	return 0;
1805}
1806
1807static int cp2102n_gpioconf_init(struct usb_serial *serial)
1808{
1809	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1810	const u16 config_size = 0x02a6;
1811	u8 gpio_rst_latch;
1812	u8 config_version;
1813	u8 gpio_pushpull;
1814	u8 *config_buf;
1815	u8 gpio_latch;
1816	u8 gpio_ctrl;
1817	int result;
1818	u8 i;
1819
1820	/*
1821	 * Retrieve device configuration from the device.
1822	 * The array received contains all customization settings done at the
1823	 * factory/manufacturer. Format of the array is documented at the
1824	 * time of writing at:
1825	 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa
1826	 */
1827	config_buf = kmalloc(config_size, GFP_KERNEL);
1828	if (!config_buf)
1829		return -ENOMEM;
1830
1831	result = cp210x_read_vendor_block(serial,
1832					  REQTYPE_DEVICE_TO_HOST,
1833					  CP210X_READ_2NCONFIG,
1834					  config_buf,
1835					  config_size);
1836	if (result < 0) {
1837		kfree(config_buf);
1838		return result;
1839	}
1840
1841	config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX];
1842	gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX];
1843	gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX];
1844	gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX];
1845
1846	kfree(config_buf);
1847
1848	/* Make sure this is a config format we understand. */
1849	if (config_version != 0x01)
1850		return -ENOTSUPP;
1851
1852	priv->gc.ngpio = 4;
1853
1854	/*
1855	 * Get default pin states after reset. Needed so we can determine
1856	 * the direction of an open-drain pin.
1857	 */
1858	gpio_latch = (gpio_rst_latch >> 3) & 0x0f;
1859
1860	/* 0 indicates open-drain mode, 1 is push-pull */
1861	priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f;
1862
1863	/* 0 indicates GPIO mode, 1 is alternate function */
1864	if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) {
1865		/* QFN20 is special... */
1866		if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE)   /* GPIO 0 */
1867			priv->gpio_altfunc |= BIT(0);
1868		if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */
1869			priv->gpio_altfunc |= BIT(1);
1870		if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */
1871			priv->gpio_altfunc |= BIT(2);
1872		if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */
1873			priv->gpio_altfunc |= BIT(3);
1874	} else {
1875		priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f;
1876	}
1877
1878	if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) {
1879		/*
1880		 * For the QFN28 package, GPIO4-6 are controlled by
1881		 * the low three bits of the mode/latch fields.
1882		 * Contrary to the document linked above, the bits for
1883		 * the SUSPEND pins are elsewhere.  No alternate
1884		 * function is available for these pins.
1885		 */
1886		priv->gc.ngpio = 7;
1887		gpio_latch |= (gpio_rst_latch & 7) << 4;
1888		priv->gpio_pushpull |= (gpio_pushpull & 7) << 4;
1889	}
1890
1891	/*
1892	 * The CP2102N does not strictly has input and output pin modes,
1893	 * it only knows open-drain and push-pull modes which is set at
1894	 * factory. An open-drain pin can function both as an
1895	 * input or an output. We emulate input mode for open-drain pins
1896	 * by making sure they are not driven low, and we do not allow
1897	 * push-pull pins to be set as an input.
1898	 */
1899	for (i = 0; i < priv->gc.ngpio; ++i) {
1900		/*
1901		 * Set direction to "input" iff pin is open-drain and reset
1902		 * value is 1.
1903		 */
1904		if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1905			priv->gpio_input |= BIT(i);
1906	}
1907
1908	return 0;
1909}
1910
1911static int cp210x_gpio_init(struct usb_serial *serial)
1912{
1913	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1914	int result;
1915
1916	switch (priv->partnum) {
1917	case CP210X_PARTNUM_CP2104:
1918		result = cp2104_gpioconf_init(serial);
1919		break;
1920	case CP210X_PARTNUM_CP2105:
1921		result = cp2105_gpioconf_init(serial);
1922		break;
1923	case CP210X_PARTNUM_CP2108:
1924		/*
1925		 * The GPIOs are not tied to any specific port so only register
1926		 * once for interface 0.
1927		 */
1928		if (cp210x_interface_num(serial) != 0)
1929			return 0;
1930		result = cp2108_gpio_init(serial);
1931		break;
1932	case CP210X_PARTNUM_CP2102N_QFN28:
1933	case CP210X_PARTNUM_CP2102N_QFN24:
1934	case CP210X_PARTNUM_CP2102N_QFN20:
1935		result = cp2102n_gpioconf_init(serial);
1936		break;
1937	default:
1938		return 0;
1939	}
1940
1941	if (result < 0)
1942		return result;
1943
1944	priv->gc.label = "cp210x";
1945	priv->gc.get_direction = cp210x_gpio_direction_get;
1946	priv->gc.direction_input = cp210x_gpio_direction_input;
1947	priv->gc.direction_output = cp210x_gpio_direction_output;
1948	priv->gc.get = cp210x_gpio_get;
1949	priv->gc.set = cp210x_gpio_set;
1950	priv->gc.set_config = cp210x_gpio_set_config;
1951	priv->gc.init_valid_mask = cp210x_gpio_init_valid_mask;
1952	priv->gc.owner = THIS_MODULE;
1953	priv->gc.parent = &serial->interface->dev;
1954	priv->gc.base = -1;
1955	priv->gc.can_sleep = true;
1956
1957	result = gpiochip_add_data(&priv->gc, serial);
1958	if (!result)
1959		priv->gpio_registered = true;
1960
1961	return result;
1962}
1963
1964static void cp210x_gpio_remove(struct usb_serial *serial)
1965{
1966	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1967
1968	if (priv->gpio_registered) {
1969		gpiochip_remove(&priv->gc);
1970		priv->gpio_registered = false;
1971	}
1972}
1973
1974#else
1975
1976static int cp210x_gpio_init(struct usb_serial *serial)
1977{
1978	return 0;
1979}
1980
1981static void cp210x_gpio_remove(struct usb_serial *serial)
1982{
1983	/* Nothing to do */
1984}
1985
1986#endif
1987
1988static int cp210x_port_probe(struct usb_serial_port *port)
1989{
1990	struct usb_serial *serial = port->serial;
1991	struct cp210x_port_private *port_priv;
1992
1993	port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1994	if (!port_priv)
1995		return -ENOMEM;
1996
1997	port_priv->bInterfaceNumber = cp210x_interface_num(serial);
1998	mutex_init(&port_priv->mutex);
1999
2000	usb_set_serial_port_data(port, port_priv);
2001
2002	return 0;
2003}
2004
2005static void cp210x_port_remove(struct usb_serial_port *port)
2006{
2007	struct cp210x_port_private *port_priv;
2008
2009	port_priv = usb_get_serial_port_data(port);
2010	kfree(port_priv);
2011}
2012
2013static void cp210x_init_max_speed(struct usb_serial *serial)
2014{
2015	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2016	bool use_actual_rate = false;
2017	speed_t min = 300;
2018	speed_t max;
2019
2020	switch (priv->partnum) {
2021	case CP210X_PARTNUM_CP2101:
2022		max = 921600;
2023		break;
2024	case CP210X_PARTNUM_CP2102:
2025	case CP210X_PARTNUM_CP2103:
2026		max = 1000000;
2027		break;
2028	case CP210X_PARTNUM_CP2104:
2029		use_actual_rate = true;
2030		max = 2000000;
2031		break;
2032	case CP210X_PARTNUM_CP2108:
2033		max = 2000000;
2034		break;
2035	case CP210X_PARTNUM_CP2105:
2036		if (cp210x_interface_num(serial) == 0) {
2037			use_actual_rate = true;
2038			max = 2000000;	/* ECI */
2039		} else {
2040			min = 2400;
2041			max = 921600;	/* SCI */
2042		}
2043		break;
2044	case CP210X_PARTNUM_CP2102N_QFN28:
2045	case CP210X_PARTNUM_CP2102N_QFN24:
2046	case CP210X_PARTNUM_CP2102N_QFN20:
2047		use_actual_rate = true;
2048		max = 3000000;
2049		break;
2050	default:
2051		max = 2000000;
2052		break;
2053	}
2054
2055	priv->min_speed = min;
2056	priv->max_speed = max;
2057	priv->use_actual_rate = use_actual_rate;
2058}
2059
2060static void cp2102_determine_quirks(struct usb_serial *serial)
2061{
2062	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2063	u8 *buf;
2064	int ret;
2065
2066	buf = kmalloc(2, GFP_KERNEL);
2067	if (!buf)
2068		return;
2069	/*
2070	 * Some (possibly counterfeit) CP2102 do not support event-insertion
2071	 * mode and respond differently to malformed vendor requests.
2072	 * Specifically, they return one instead of two bytes when sent a
2073	 * two-byte part-number request.
2074	 */
2075	ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2076			CP210X_VENDOR_SPECIFIC, REQTYPE_DEVICE_TO_HOST,
2077			CP210X_GET_PARTNUM, 0, buf, 2, USB_CTRL_GET_TIMEOUT);
2078	if (ret == 1) {
2079		dev_dbg(&serial->interface->dev,
2080				"device does not support event-insertion mode\n");
2081		priv->no_event_mode = true;
2082	}
2083
2084	kfree(buf);
2085}
2086
2087static int cp210x_get_fw_version(struct usb_serial *serial, u16 value)
2088{
2089	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2090	u8 ver[3];
2091	int ret;
2092
2093	ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, value,
2094			ver, sizeof(ver));
2095	if (ret)
2096		return ret;
2097
2098	dev_dbg(&serial->interface->dev, "%s - %d.%d.%d\n", __func__,
2099			ver[0], ver[1], ver[2]);
2100
2101	priv->fw_version = ver[0] << 16 | ver[1] << 8 | ver[2];
2102
2103	return 0;
2104}
2105
2106static void cp210x_determine_type(struct usb_serial *serial)
2107{
2108	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2109	int ret;
2110
2111	ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
2112			CP210X_GET_PARTNUM, &priv->partnum,
2113			sizeof(priv->partnum));
2114	if (ret < 0) {
2115		dev_warn(&serial->interface->dev,
2116				"querying part number failed\n");
2117		priv->partnum = CP210X_PARTNUM_UNKNOWN;
2118		return;
2119	}
2120
2121	dev_dbg(&serial->interface->dev, "partnum = 0x%02x\n", priv->partnum);
2122
2123	switch (priv->partnum) {
2124	case CP210X_PARTNUM_CP2102:
2125		cp2102_determine_quirks(serial);
2126		break;
2127	case CP210X_PARTNUM_CP2105:
2128	case CP210X_PARTNUM_CP2108:
2129		cp210x_get_fw_version(serial, CP210X_GET_FW_VER);
2130		break;
2131	case CP210X_PARTNUM_CP2102N_QFN28:
2132	case CP210X_PARTNUM_CP2102N_QFN24:
2133	case CP210X_PARTNUM_CP2102N_QFN20:
2134		ret = cp210x_get_fw_version(serial, CP210X_GET_FW_VER_2N);
2135		if (ret)
2136			break;
2137		if (priv->fw_version <= 0x10004)
2138			priv->no_flow_control = true;
2139		break;
2140	default:
2141		break;
2142	}
2143}
2144
2145static int cp210x_attach(struct usb_serial *serial)
2146{
2147	int result;
2148	struct cp210x_serial_private *priv;
2149
2150	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2151	if (!priv)
2152		return -ENOMEM;
2153
2154	usb_set_serial_data(serial, priv);
2155
2156	cp210x_determine_type(serial);
2157	cp210x_init_max_speed(serial);
2158
2159	result = cp210x_gpio_init(serial);
2160	if (result < 0) {
2161		dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n",
2162				result);
2163	}
2164
2165	return 0;
2166}
2167
2168static void cp210x_disconnect(struct usb_serial *serial)
2169{
2170	cp210x_gpio_remove(serial);
2171}
2172
2173static void cp210x_release(struct usb_serial *serial)
2174{
2175	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2176
2177	cp210x_gpio_remove(serial);
2178
2179	kfree(priv);
 
2180}
2181
2182module_usb_serial_driver(serial_drivers, id_table);
2183
2184MODULE_DESCRIPTION(DRIVER_DESC);
2185MODULE_LICENSE("GPL v2");