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