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(0x04BF, 0x1301) }, /* TDK Corporation NC0110013M - Network Controller */
  60	{ USB_DEVICE(0x04BF, 0x1303) }, /* TDK Corporation MM0110113M - i3 Micro Module */
  61	{ USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
  62	{ USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
  63	{ USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
  64	{ USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
  65	{ USB_DEVICE(0x0908, 0x0070) }, /* Siemens SCALANCE LPE-9000 USB Serial Console */
  66	{ USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
  67	{ USB_DEVICE(0x0988, 0x0578) }, /* Teraoka AD2000 */
  68	{ USB_DEVICE(0x0B00, 0x3070) }, /* Ingenico 3070 */
  69	{ USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
  70	{ USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
  71	{ USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  72	{ USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
  73	{ USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
  74	{ USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
  75	{ USB_DEVICE(0x106F, 0x0003) },	/* CPI / Money Controls Bulk Coin Recycler */
  76	{ USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  77	{ USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  78	{ USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  79	{ USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
  80	{ USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
  81	{ USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
  82	{ USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
  83	{ USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  84	{ USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
  85	{ USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
  86	{ USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
  87	{ USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
  88	{ USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */
  89	{ USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  90	{ USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
  91	{ USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  92	{ USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
  93	{ USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  94	{ USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
  95	{ USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  96	{ USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
  97	{ USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  98	{ USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
  99	{ USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
 100	{ USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
 101	{ USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
 102	{ USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
 103	{ USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
 104	{ USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
 105	{ USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */
 106	{ USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */
 107	{ USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */
 108	{ USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
 109	{ USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
 110	{ USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
 111	{ USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
 112	{ USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
 113	{ USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
 114	{ USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
 115	{ USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
 116	{ USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
 117	{ USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
 118	{ USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
 119	{ USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
 120	{ USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
 121	{ USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
 122	{ USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
 123	{ USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
 124	{ USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
 125	{ USB_DEVICE(0x10C4, 0x82AA) }, /* Silicon Labs IFS-USB-DATACABLE used with Quint UPS */
 126	{ USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */
 127	{ USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */
 128	{ USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */
 129	{ USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
 130	{ USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
 131	{ USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
 132	{ USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
 133	{ USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
 134	{ USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */
 135	{ USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
 136	{ USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
 137	{ USB_DEVICE(0x10C4, 0x8414) }, /* Decagon USB Cable Adapter */
 138	{ USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
 139	{ USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
 140	{ USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
 141	{ USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
 142	{ USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
 143	{ USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */
 144	{ USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */
 145	{ USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */
 146	{ USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
 147	{ USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
 148	{ USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
 149	{ USB_DEVICE(0x10C4, 0x863C) }, /* MGP Instruments PDS100 */
 150	{ USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
 151	{ USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
 152	{ USB_DEVICE(0x10C4, 0x87ED) }, /* IMST USB-Stick for Smart Meter */
 153	{ USB_DEVICE(0x10C4, 0x8856) },	/* CEL EM357 ZigBee USB Stick - LR */
 154	{ USB_DEVICE(0x10C4, 0x8857) },	/* CEL EM357 ZigBee USB Stick */
 155	{ USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
 156	{ USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
 157	{ USB_DEVICE(0x10C4, 0x88D8) }, /* Acuity Brands nLight Air Adapter */
 158	{ USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */
 159	{ USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */
 160	{ USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
 161	{ USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
 162	{ USB_DEVICE(0x10C4, 0x8977) },	/* CEL MeshWorks DevKit Device */
 163	{ USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
 164	{ USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */
 165	{ USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */
 166	{ USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
 167	{ USB_DEVICE(0x10C4, 0x8A5B) }, /* CEL EM3588 ZigBee USB Stick */
 168	{ USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
 169	{ USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
 170	{ USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 171	{ USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 172	{ USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */
 173	{ USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
 174	{ USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
 175	{ USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */
 176	{ USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */
 177	{ USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 178	{ USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 179	{ USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 180	{ USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 181	{ USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 182	{ USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 183	{ USB_DEVICE(0x11CA, 0x0212) }, /* Verifone USB to Printer (UART, CP2102) */
 184	{ USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
 185	{ USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
 186	{ USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 187	{ USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 188	{ USB_DEVICE(0x155A, 0x1006) },	/* ELDAT Easywave RX09 */
 189	{ USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
 190	{ USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
 191	{ USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 192	{ USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
 193	{ USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
 194	{ USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
 195	{ USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
 196	{ USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
 197	{ USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
 198	{ USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 199	{ USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
 200	{ USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
 201	{ USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
 202	{ USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
 203	{ USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
 204	{ USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
 205	{ USB_DEVICE(0x17A8, 0x0011) }, /* Kamstrup 444 MHz RF sniffer */
 206	{ USB_DEVICE(0x17A8, 0x0013) }, /* Kamstrup 870 MHz RF sniffer */
 207	{ USB_DEVICE(0x17A8, 0x0101) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Int Ant) */
 208	{ USB_DEVICE(0x17A8, 0x0102) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Ext Ant) */
 209	{ USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
 210	{ USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
 211	{ USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 212	{ USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
 213	{ USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
 214	{ USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
 215	{ USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
 216	{ USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
 217	{ USB_DEVICE(0x1901, 0x0194) },	/* GE Healthcare Remote Alarm Box */
 218	{ USB_DEVICE(0x1901, 0x0195) },	/* GE B850/B650/B450 CP2104 DP UART interface */
 219	{ USB_DEVICE(0x1901, 0x0196) },	/* GE B850 CP2105 DP UART interface */
 220	{ USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 M.2 Key E serial interface */
 221	{ USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 Display serial interface */
 222	{ USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */
 223	{ USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
 224	{ USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
 225	{ USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
 226	{ USB_DEVICE(0x1B93, 0x1013) }, /* Phoenix Contact UPS Device */
 227	{ USB_DEVICE(0x1BA4, 0x0002) },	/* Silicon Labs 358x factory default */
 228	{ USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
 229	{ USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
 230	{ USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
 231	{ USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
 232	{ USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
 233	{ USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
 234	{ USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
 235	{ USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
 236	{ USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
 237	{ USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
 238	{ USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
 239	{ USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
 240	{ USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
 241	{ USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
 242	{ USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
 243	{ USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
 244	{ USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
 245	{ USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
 246	{ USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
 247	{ USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
 248	{ USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
 249	{ USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
 250	{ USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
 251	{ USB_DEVICE(0x2184, 0x0030) }, /* GW Instek GDM-834x Digital Multimeter */
 252	{ USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
 253	{ USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
 254	{ USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
 255	{ USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
 256	{ USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
 257	{ USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 258	{ } /* Terminating Entry */
 259};
 260
 261MODULE_DEVICE_TABLE(usb, id_table);
 262
 263struct cp210x_serial_private {
 264#ifdef CONFIG_GPIOLIB
 265	struct gpio_chip	gc;
 
 
 266	bool			gpio_registered;
 267	u16			gpio_pushpull;
 268	u16			gpio_altfunc;
 269	u16			gpio_input;
 270#endif
 271	u8			partnum;
 272	u32			fw_version;
 273	speed_t			min_speed;
 274	speed_t			max_speed;
 275	bool			use_actual_rate;
 276	bool			no_flow_control;
 277	bool			no_event_mode;
 278};
 279
 280enum cp210x_event_state {
 281	ES_DATA,
 282	ES_ESCAPE,
 283	ES_LSR,
 284	ES_LSR_DATA_0,
 285	ES_LSR_DATA_1,
 286	ES_MSR
 287};
 288
 289struct cp210x_port_private {
 290	u8			bInterfaceNumber;
 291	bool			event_mode;
 292	enum cp210x_event_state event_state;
 293	u8			lsr;
 294
 295	struct mutex		mutex;
 296	bool			crtscts;
 297	bool			dtr;
 298	bool			rts;
 299};
 300
 301static struct usb_serial_driver cp210x_device = {
 302	.driver = {
 
 303		.name =		"cp210x",
 304	},
 305	.id_table		= id_table,
 306	.num_ports		= 1,
 307	.bulk_in_size		= 256,
 308	.bulk_out_size		= 256,
 309	.open			= cp210x_open,
 310	.close			= cp210x_close,
 311	.break_ctl		= cp210x_break_ctl,
 312	.set_termios		= cp210x_set_termios,
 313	.tx_empty		= cp210x_tx_empty,
 314	.throttle		= usb_serial_generic_throttle,
 315	.unthrottle		= usb_serial_generic_unthrottle,
 316	.tiocmget		= cp210x_tiocmget,
 317	.tiocmset		= cp210x_tiocmset,
 318	.get_icount		= usb_serial_generic_get_icount,
 319	.attach			= cp210x_attach,
 320	.disconnect		= cp210x_disconnect,
 321	.release		= cp210x_release,
 322	.port_probe		= cp210x_port_probe,
 323	.port_remove		= cp210x_port_remove,
 324	.dtr_rts		= cp210x_dtr_rts,
 325	.process_read_urb	= cp210x_process_read_urb,
 326};
 327
 328static struct usb_serial_driver * const serial_drivers[] = {
 329	&cp210x_device, NULL
 330};
 331
 332/* Config request types */
 333#define REQTYPE_HOST_TO_INTERFACE	0x41
 334#define REQTYPE_INTERFACE_TO_HOST	0xc1
 335#define REQTYPE_HOST_TO_DEVICE	0x40
 336#define REQTYPE_DEVICE_TO_HOST	0xc0
 337
 338/* Config request codes */
 339#define CP210X_IFC_ENABLE	0x00
 340#define CP210X_SET_BAUDDIV	0x01
 341#define CP210X_GET_BAUDDIV	0x02
 342#define CP210X_SET_LINE_CTL	0x03
 343#define CP210X_GET_LINE_CTL	0x04
 344#define CP210X_SET_BREAK	0x05
 345#define CP210X_IMM_CHAR		0x06
 346#define CP210X_SET_MHS		0x07
 347#define CP210X_GET_MDMSTS	0x08
 348#define CP210X_SET_XON		0x09
 349#define CP210X_SET_XOFF		0x0A
 350#define CP210X_SET_EVENTMASK	0x0B
 351#define CP210X_GET_EVENTMASK	0x0C
 352#define CP210X_SET_CHAR		0x0D
 353#define CP210X_GET_CHARS	0x0E
 354#define CP210X_GET_PROPS	0x0F
 355#define CP210X_GET_COMM_STATUS	0x10
 356#define CP210X_RESET		0x11
 357#define CP210X_PURGE		0x12
 358#define CP210X_SET_FLOW		0x13
 359#define CP210X_GET_FLOW		0x14
 360#define CP210X_EMBED_EVENTS	0x15
 361#define CP210X_GET_EVENTSTATE	0x16
 362#define CP210X_SET_CHARS	0x19
 363#define CP210X_GET_BAUDRATE	0x1D
 364#define CP210X_SET_BAUDRATE	0x1E
 365#define CP210X_VENDOR_SPECIFIC	0xFF
 366
 367/* CP210X_IFC_ENABLE */
 368#define UART_ENABLE		0x0001
 369#define UART_DISABLE		0x0000
 370
 371/* CP210X_(SET|GET)_BAUDDIV */
 372#define BAUD_RATE_GEN_FREQ	0x384000
 373
 374/* CP210X_(SET|GET)_LINE_CTL */
 375#define BITS_DATA_MASK		0X0f00
 376#define BITS_DATA_5		0X0500
 377#define BITS_DATA_6		0X0600
 378#define BITS_DATA_7		0X0700
 379#define BITS_DATA_8		0X0800
 380#define BITS_DATA_9		0X0900
 381
 382#define BITS_PARITY_MASK	0x00f0
 383#define BITS_PARITY_NONE	0x0000
 384#define BITS_PARITY_ODD		0x0010
 385#define BITS_PARITY_EVEN	0x0020
 386#define BITS_PARITY_MARK	0x0030
 387#define BITS_PARITY_SPACE	0x0040
 388
 389#define BITS_STOP_MASK		0x000f
 390#define BITS_STOP_1		0x0000
 391#define BITS_STOP_1_5		0x0001
 392#define BITS_STOP_2		0x0002
 393
 394/* CP210X_SET_BREAK */
 395#define BREAK_ON		0x0001
 396#define BREAK_OFF		0x0000
 397
 398/* CP210X_(SET_MHS|GET_MDMSTS) */
 399#define CONTROL_DTR		0x0001
 400#define CONTROL_RTS		0x0002
 401#define CONTROL_CTS		0x0010
 402#define CONTROL_DSR		0x0020
 403#define CONTROL_RING		0x0040
 404#define CONTROL_DCD		0x0080
 405#define CONTROL_WRITE_DTR	0x0100
 406#define CONTROL_WRITE_RTS	0x0200
 407
 408/* CP210X_(GET|SET)_CHARS */
 409struct cp210x_special_chars {
 410	u8	bEofChar;
 411	u8	bErrorChar;
 412	u8	bBreakChar;
 413	u8	bEventChar;
 414	u8	bXonChar;
 415	u8	bXoffChar;
 416};
 417
 418/* CP210X_VENDOR_SPECIFIC values */
 419#define CP210X_GET_FW_VER	0x000E
 420#define CP210X_READ_2NCONFIG	0x000E
 421#define CP210X_GET_FW_VER_2N	0x0010
 422#define CP210X_READ_LATCH	0x00C2
 423#define CP210X_GET_PARTNUM	0x370B
 424#define CP210X_GET_PORTCONFIG	0x370C
 425#define CP210X_GET_DEVICEMODE	0x3711
 426#define CP210X_WRITE_LATCH	0x37E1
 427
 428/* Part number definitions */
 429#define CP210X_PARTNUM_CP2101	0x01
 430#define CP210X_PARTNUM_CP2102	0x02
 431#define CP210X_PARTNUM_CP2103	0x03
 432#define CP210X_PARTNUM_CP2104	0x04
 433#define CP210X_PARTNUM_CP2105	0x05
 434#define CP210X_PARTNUM_CP2108	0x08
 435#define CP210X_PARTNUM_CP2102N_QFN28	0x20
 436#define CP210X_PARTNUM_CP2102N_QFN24	0x21
 437#define CP210X_PARTNUM_CP2102N_QFN20	0x22
 438#define CP210X_PARTNUM_UNKNOWN	0xFF
 439
 440/* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
 441struct cp210x_comm_status {
 442	__le32   ulErrors;
 443	__le32   ulHoldReasons;
 444	__le32   ulAmountInInQueue;
 445	__le32   ulAmountInOutQueue;
 446	u8       bEofReceived;
 447	u8       bWaitForImmediate;
 448	u8       bReserved;
 449} __packed;
 450
 451/*
 452 * CP210X_PURGE - 16 bits passed in wValue of USB request.
 453 * SiLabs app note AN571 gives a strange description of the 4 bits:
 454 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
 455 * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
 456 */
 457#define PURGE_ALL		0x000f
 458
 459/* CP210X_EMBED_EVENTS */
 460#define CP210X_ESCCHAR		0xec
 461
 462#define CP210X_LSR_OVERRUN	BIT(1)
 463#define CP210X_LSR_PARITY	BIT(2)
 464#define CP210X_LSR_FRAME	BIT(3)
 465#define CP210X_LSR_BREAK	BIT(4)
 466
 467
 468/* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
 469struct cp210x_flow_ctl {
 470	__le32	ulControlHandshake;
 471	__le32	ulFlowReplace;
 472	__le32	ulXonLimit;
 473	__le32	ulXoffLimit;
 474};
 475
 476/* cp210x_flow_ctl::ulControlHandshake */
 477#define CP210X_SERIAL_DTR_MASK		GENMASK(1, 0)
 478#define CP210X_SERIAL_DTR_INACTIVE	(0 << 0)
 479#define CP210X_SERIAL_DTR_ACTIVE	(1 << 0)
 480#define CP210X_SERIAL_DTR_FLOW_CTL	(2 << 0)
 481#define CP210X_SERIAL_CTS_HANDSHAKE	BIT(3)
 482#define CP210X_SERIAL_DSR_HANDSHAKE	BIT(4)
 483#define CP210X_SERIAL_DCD_HANDSHAKE	BIT(5)
 484#define CP210X_SERIAL_DSR_SENSITIVITY	BIT(6)
 485
 
 
 
 
 
 486/* cp210x_flow_ctl::ulFlowReplace */
 487#define CP210X_SERIAL_AUTO_TRANSMIT	BIT(0)
 488#define CP210X_SERIAL_AUTO_RECEIVE	BIT(1)
 489#define CP210X_SERIAL_ERROR_CHAR	BIT(2)
 490#define CP210X_SERIAL_NULL_STRIPPING	BIT(3)
 491#define CP210X_SERIAL_BREAK_CHAR	BIT(4)
 492#define CP210X_SERIAL_RTS_MASK		GENMASK(7, 6)
 493#define CP210X_SERIAL_RTS_INACTIVE	(0 << 6)
 494#define CP210X_SERIAL_RTS_ACTIVE	(1 << 6)
 495#define CP210X_SERIAL_RTS_FLOW_CTL	(2 << 6)
 496#define CP210X_SERIAL_XOFF_CONTINUE	BIT(31)
 497
 
 
 
 
 
 498/* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
 499struct cp210x_pin_mode {
 500	u8	eci;
 501	u8	sci;
 502};
 503
 504#define CP210X_PIN_MODE_MODEM		0
 505#define CP210X_PIN_MODE_GPIO		BIT(0)
 506
 507/*
 508 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes
 509 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes.
 510 */
 511struct cp210x_dual_port_config {
 512	__le16	gpio_mode;
 513	u8	__pad0[2];
 514	__le16	reset_state;
 515	u8	__pad1[4];
 516	__le16	suspend_state;
 517	u8	sci_cfg;
 518	u8	eci_cfg;
 519	u8	device_cfg;
 520} __packed;
 521
 522/*
 523 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes
 524 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes.
 525 */
 526struct cp210x_single_port_config {
 527	__le16	gpio_mode;
 528	u8	__pad0[2];
 529	__le16	reset_state;
 530	u8	__pad1[4];
 531	__le16	suspend_state;
 532	u8	device_cfg;
 533} __packed;
 534
 535/* GPIO modes */
 536#define CP210X_SCI_GPIO_MODE_OFFSET	9
 537#define CP210X_SCI_GPIO_MODE_MASK	GENMASK(11, 9)
 538
 539#define CP210X_ECI_GPIO_MODE_OFFSET	2
 540#define CP210X_ECI_GPIO_MODE_MASK	GENMASK(3, 2)
 541
 542#define CP210X_GPIO_MODE_OFFSET		8
 543#define CP210X_GPIO_MODE_MASK		GENMASK(11, 8)
 544
 545/* CP2105 port configuration values */
 546#define CP2105_GPIO0_TXLED_MODE		BIT(0)
 547#define CP2105_GPIO1_RXLED_MODE		BIT(1)
 548#define CP2105_GPIO1_RS485_MODE		BIT(2)
 549
 550/* CP2104 port configuration values */
 551#define CP2104_GPIO0_TXLED_MODE		BIT(0)
 552#define CP2104_GPIO1_RXLED_MODE		BIT(1)
 553#define CP2104_GPIO2_RS485_MODE		BIT(2)
 554
 555struct cp210x_quad_port_state {
 556	__le16 gpio_mode_pb0;
 557	__le16 gpio_mode_pb1;
 558	__le16 gpio_mode_pb2;
 559	__le16 gpio_mode_pb3;
 560	__le16 gpio_mode_pb4;
 561
 562	__le16 gpio_lowpower_pb0;
 563	__le16 gpio_lowpower_pb1;
 564	__le16 gpio_lowpower_pb2;
 565	__le16 gpio_lowpower_pb3;
 566	__le16 gpio_lowpower_pb4;
 567
 568	__le16 gpio_latch_pb0;
 569	__le16 gpio_latch_pb1;
 570	__le16 gpio_latch_pb2;
 571	__le16 gpio_latch_pb3;
 572	__le16 gpio_latch_pb4;
 573};
 574
 575/*
 576 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0x49 bytes
 577 * on a CP2108 chip.
 578 *
 579 * See https://www.silabs.com/documents/public/application-notes/an978-cp210x-usb-to-uart-api-specification.pdf
 580 */
 581struct cp210x_quad_port_config {
 582	struct cp210x_quad_port_state reset_state;
 583	struct cp210x_quad_port_state suspend_state;
 584	u8 ipdelay_ifc[4];
 585	u8 enhancedfxn_ifc[4];
 586	u8 enhancedfxn_device;
 587	u8 extclkfreq[4];
 588} __packed;
 589
 590#define CP2108_EF_IFC_GPIO_TXLED		0x01
 591#define CP2108_EF_IFC_GPIO_RXLED		0x02
 592#define CP2108_EF_IFC_GPIO_RS485		0x04
 593#define CP2108_EF_IFC_GPIO_RS485_LOGIC		0x08
 594#define CP2108_EF_IFC_GPIO_CLOCK		0x10
 595#define CP2108_EF_IFC_DYNAMIC_SUSPEND		0x40
 596
 597/* CP2102N configuration array indices */
 598#define CP210X_2NCONFIG_CONFIG_VERSION_IDX	2
 599#define CP210X_2NCONFIG_GPIO_MODE_IDX		581
 600#define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX	587
 601#define CP210X_2NCONFIG_GPIO_CONTROL_IDX	600
 602
 603/* CP2102N QFN20 port configuration values */
 604#define CP2102N_QFN20_GPIO2_TXLED_MODE		BIT(2)
 605#define CP2102N_QFN20_GPIO3_RXLED_MODE		BIT(3)
 606#define CP2102N_QFN20_GPIO1_RS485_MODE		BIT(4)
 607#define CP2102N_QFN20_GPIO0_CLK_MODE		BIT(6)
 608
 609/*
 610 * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x02 bytes
 611 * for CP2102N, CP2103, CP2104 and CP2105.
 612 */
 613struct cp210x_gpio_write {
 614	u8	mask;
 615	u8	state;
 616};
 617
 618/*
 619 * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x04 bytes
 620 * for CP2108.
 621 */
 622struct cp210x_gpio_write16 {
 623	__le16	mask;
 624	__le16	state;
 625};
 626
 627/*
 628 * Helper to get interface number when we only have struct usb_serial.
 629 */
 630static u8 cp210x_interface_num(struct usb_serial *serial)
 631{
 632	struct usb_host_interface *cur_altsetting;
 633
 634	cur_altsetting = serial->interface->cur_altsetting;
 635
 636	return cur_altsetting->desc.bInterfaceNumber;
 637}
 638
 639/*
 640 * Reads a variable-sized block of CP210X_ registers, identified by req.
 641 * Returns data into buf in native USB byte order.
 642 */
 643static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
 644		void *buf, int bufsize)
 645{
 646	struct usb_serial *serial = port->serial;
 647	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 
 648	int result;
 649
 
 
 
 
 
 
 
 
 
 650
 651	result = usb_control_msg_recv(serial->dev, 0, req,
 652			REQTYPE_INTERFACE_TO_HOST, 0,
 653			port_priv->bInterfaceNumber, buf, bufsize,
 654			USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
 655	if (result) {
 
 
 
 656		dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
 657				req, bufsize, result);
 658		return result;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 659	}
 660
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 661	return 0;
 662}
 663
 664/*
 665 * Reads any 8-bit CP210X_ register identified by req.
 666 */
 667static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
 668{
 669	return cp210x_read_reg_block(port, req, val, sizeof(*val));
 670}
 671
 672/*
 673 * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
 674 * Returns data into buf in native USB byte order.
 675 */
 676static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
 677				    void *buf, int bufsize)
 678{
 
 679	int result;
 680
 681	result = usb_control_msg_recv(serial->dev, 0, CP210X_VENDOR_SPECIFIC,
 682			type, val, cp210x_interface_num(serial), buf, bufsize,
 683			USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
 684	if (result) {
 
 
 
 
 
 
 
 
 685		dev_err(&serial->interface->dev,
 686			"failed to get vendor val 0x%04x size %d: %d\n", val,
 687			bufsize, result);
 688		return result;
 
 689	}
 690
 691	return 0;
 
 
 692}
 693
 694/*
 695 * Writes any 16-bit CP210X_ register (req) whose value is passed
 696 * entirely in the wValue field of the USB request.
 697 */
 698static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
 699{
 700	struct usb_serial *serial = port->serial;
 701	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 702	int result;
 703
 704	result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 705			req, REQTYPE_HOST_TO_INTERFACE, val,
 706			port_priv->bInterfaceNumber, NULL, 0,
 707			USB_CTRL_SET_TIMEOUT);
 708	if (result < 0) {
 709		dev_err(&port->dev, "failed set request 0x%x status: %d\n",
 710				req, result);
 711	}
 712
 713	return result;
 714}
 715
 716/*
 717 * Writes a variable-sized block of CP210X_ registers, identified by req.
 718 * Data in buf must be in native USB byte order.
 719 */
 720static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
 721		void *buf, int bufsize)
 722{
 723	struct usb_serial *serial = port->serial;
 724	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 
 725	int result;
 726
 727	result = usb_control_msg_send(serial->dev, 0, req,
 728			REQTYPE_HOST_TO_INTERFACE, 0,
 729			port_priv->bInterfaceNumber, buf, bufsize,
 730			USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
 731	if (result) {
 
 
 
 
 
 
 
 
 
 732		dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
 733				req, bufsize, result);
 734		return result;
 
 735	}
 736
 737	return 0;
 738}
 739
 740/*
 741 * Writes any 32-bit CP210X_ register identified by req.
 742 */
 743static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
 744{
 745	__le32 le32_val;
 746
 747	le32_val = cpu_to_le32(val);
 748
 749	return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
 750}
 751
 752#ifdef CONFIG_GPIOLIB
 753/*
 754 * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
 755 * Data in buf must be in native USB byte order.
 756 */
 757static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
 758				     u16 val, void *buf, int bufsize)
 759{
 
 760	int result;
 761
 762	result = usb_control_msg_send(serial->dev, 0, CP210X_VENDOR_SPECIFIC,
 763			type, val, cp210x_interface_num(serial), buf, bufsize,
 764			USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
 765	if (result) {
 
 
 
 
 
 
 
 
 
 
 766		dev_err(&serial->interface->dev,
 767			"failed to set vendor val 0x%04x size %d: %d\n", val,
 768			bufsize, result);
 769		return result;
 
 770	}
 771
 772	return 0;
 773}
 774#endif
 775
 776static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 
 
 
 
 
 
 777{
 778	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 779	int result;
 780
 781	result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
 782	if (result) {
 783		dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
 784		return result;
 785	}
 786
 787	if (tty)
 788		cp210x_set_termios(tty, port, NULL);
 
 789
 790	result = usb_serial_generic_open(tty, port);
 791	if (result)
 792		goto err_disable;
 793
 794	return 0;
 
 
 795
 796err_disable:
 797	cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 798	port_priv->event_mode = false;
 
 799
 800	return result;
 801}
 802
 803static void cp210x_close(struct usb_serial_port *port)
 
 
 
 
 804{
 805	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 
 806
 807	usb_serial_generic_close(port);
 808
 809	/* Clear both queues; cp2108 needs this to avoid an occasional hang */
 810	cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
 811
 812	cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 
 
 813
 814	/* Disabling the interface disables event-insertion mode. */
 815	port_priv->event_mode = false;
 816}
 817
 818static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag)
 
 
 
 
 819{
 820	if (lsr & CP210X_LSR_BREAK) {
 821		port->icount.brk++;
 822		*flag = TTY_BREAK;
 823	} else if (lsr & CP210X_LSR_PARITY) {
 824		port->icount.parity++;
 825		*flag = TTY_PARITY;
 826	} else if (lsr & CP210X_LSR_FRAME) {
 827		port->icount.frame++;
 828		*flag = TTY_FRAME;
 829	}
 830
 831	if (lsr & CP210X_LSR_OVERRUN) {
 832		port->icount.overrun++;
 833		tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
 834	}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 835}
 836
 837static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag)
 838{
 839	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 840
 841	switch (port_priv->event_state) {
 842	case ES_DATA:
 843		if (*ch == CP210X_ESCCHAR) {
 844			port_priv->event_state = ES_ESCAPE;
 845			break;
 846		}
 847		return false;
 848	case ES_ESCAPE:
 849		switch (*ch) {
 850		case 0:
 851			dev_dbg(&port->dev, "%s - escape char\n", __func__);
 852			*ch = CP210X_ESCCHAR;
 853			port_priv->event_state = ES_DATA;
 854			return false;
 855		case 1:
 856			port_priv->event_state = ES_LSR_DATA_0;
 857			break;
 858		case 2:
 859			port_priv->event_state = ES_LSR;
 860			break;
 861		case 3:
 862			port_priv->event_state = ES_MSR;
 863			break;
 864		default:
 865			dev_err(&port->dev, "malformed event 0x%02x\n", *ch);
 866			port_priv->event_state = ES_DATA;
 867			break;
 868		}
 869		break;
 870	case ES_LSR_DATA_0:
 871		port_priv->lsr = *ch;
 872		port_priv->event_state = ES_LSR_DATA_1;
 873		break;
 874	case ES_LSR_DATA_1:
 875		dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n",
 876				__func__, port_priv->lsr, *ch);
 877		cp210x_process_lsr(port, port_priv->lsr, flag);
 878		port_priv->event_state = ES_DATA;
 879		return false;
 880	case ES_LSR:
 881		dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch);
 882		port_priv->lsr = *ch;
 883		cp210x_process_lsr(port, port_priv->lsr, flag);
 884		port_priv->event_state = ES_DATA;
 885		break;
 886	case ES_MSR:
 887		dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch);
 888		/* unimplemented */
 889		port_priv->event_state = ES_DATA;
 890		break;
 891	}
 892
 893	return true;
 894}
 895
 896static void cp210x_process_read_urb(struct urb *urb)
 897{
 898	struct usb_serial_port *port = urb->context;
 899	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 900	unsigned char *ch = urb->transfer_buffer;
 901	char flag;
 902	int i;
 903
 904	if (!urb->actual_length)
 905		return;
 906
 907	if (port_priv->event_mode) {
 908		for (i = 0; i < urb->actual_length; i++, ch++) {
 909			flag = TTY_NORMAL;
 910
 911			if (cp210x_process_char(port, ch, &flag))
 912				continue;
 913
 914			tty_insert_flip_char(&port->port, *ch, flag);
 915		}
 916	} else {
 917		tty_insert_flip_string(&port->port, ch, urb->actual_length);
 918	}
 919	tty_flip_buffer_push(&port->port);
 920}
 921
 922/*
 923 * Read how many bytes are waiting in the TX queue.
 924 */
 925static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
 926		u32 *count)
 927{
 928	struct usb_serial *serial = port->serial;
 929	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 930	struct cp210x_comm_status sts;
 931	int result;
 932
 933	result = usb_control_msg_recv(serial->dev, 0, CP210X_GET_COMM_STATUS,
 934			REQTYPE_INTERFACE_TO_HOST, 0,
 935			port_priv->bInterfaceNumber, &sts, sizeof(sts),
 936			USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
 937	if (result) {
 
 
 
 
 
 
 
 938		dev_err(&port->dev, "failed to get comm status: %d\n", result);
 939		return result;
 
 940	}
 941
 942	*count = le32_to_cpu(sts.ulAmountInOutQueue);
 943
 944	return 0;
 945}
 946
 947static bool cp210x_tx_empty(struct usb_serial_port *port)
 948{
 949	int err;
 950	u32 count;
 951
 952	err = cp210x_get_tx_queue_byte_count(port, &count);
 953	if (err)
 954		return true;
 955
 956	return !count;
 957}
 958
 959struct cp210x_rate {
 960	speed_t rate;
 961	speed_t high;
 962};
 963
 964static const struct cp210x_rate cp210x_an205_table1[] = {
 965	{ 300, 300 },
 966	{ 600, 600 },
 967	{ 1200, 1200 },
 968	{ 1800, 1800 },
 969	{ 2400, 2400 },
 970	{ 4000, 4000 },
 971	{ 4800, 4803 },
 972	{ 7200, 7207 },
 973	{ 9600, 9612 },
 974	{ 14400, 14428 },
 975	{ 16000, 16062 },
 976	{ 19200, 19250 },
 977	{ 28800, 28912 },
 978	{ 38400, 38601 },
 979	{ 51200, 51558 },
 980	{ 56000, 56280 },
 981	{ 57600, 58053 },
 982	{ 64000, 64111 },
 983	{ 76800, 77608 },
 984	{ 115200, 117028 },
 985	{ 128000, 129347 },
 986	{ 153600, 156868 },
 987	{ 230400, 237832 },
 988	{ 250000, 254234 },
 989	{ 256000, 273066 },
 990	{ 460800, 491520 },
 991	{ 500000, 567138 },
 992	{ 576000, 670254 },
 993	{ 921600, UINT_MAX }
 994};
 995
 996/*
 997 * Quantises the baud rate as per AN205 Table 1
 
 
 
 998 */
 999static speed_t cp210x_get_an205_rate(speed_t baud)
 
1000{
1001	int i;
1002
1003	for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) {
1004		if (baud <= cp210x_an205_table1[i].high)
1005			break;
 
 
 
 
 
1006	}
1007
1008	return cp210x_an205_table1[i].rate;
1009}
1010
1011static speed_t cp210x_get_actual_rate(speed_t baud)
 
 
 
 
 
1012{
1013	unsigned int prescale = 1;
1014	unsigned int div;
 
 
 
 
1015
1016	if (baud <= 365)
1017		prescale = 4;
1018
1019	div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud);
1020	baud = 48000000 / (2 * prescale * div);
1021
1022	return baud;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1023}
1024
1025/*
1026 * CP2101 supports the following baud rates:
1027 *
1028 *	300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1029 *	38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1030 *
1031 * CP2102 and CP2103 support the following additional rates:
1032 *
1033 *	4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1034 *	576000
1035 *
1036 * The device will map a requested rate to a supported one, but the result
1037 * of requests for rates greater than 1053257 is undefined (see AN205).
1038 *
1039 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1040 * respectively, with an error less than 1%. The actual rates are determined
1041 * by
1042 *
1043 *	div = round(freq / (2 x prescale x request))
1044 *	actual = freq / (2 x prescale x div)
1045 *
1046 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1047 * or 1 otherwise.
1048 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1049 * otherwise.
1050 */
1051static void cp210x_change_speed(struct tty_struct *tty,
1052				struct usb_serial_port *port,
1053				const struct ktermios *old_termios)
1054{
1055	struct usb_serial *serial = port->serial;
1056	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1057	u32 baud;
1058
1059	if (tty->termios.c_ospeed == 0)
1060		return;
1061
1062	/*
1063	 * This maps the requested rate to the actual rate, a valid rate on
1064	 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed].
 
1065	 */
1066	baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed);
1067
1068	if (priv->use_actual_rate)
1069		baud = cp210x_get_actual_rate(baud);
1070	else if (baud < 1000000)
1071		baud = cp210x_get_an205_rate(baud);
1072
1073	dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1074	if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1075		dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1076		if (old_termios)
1077			baud = old_termios->c_ospeed;
1078		else
1079			baud = 9600;
1080	}
1081
1082	tty_encode_baud_rate(tty, baud, baud);
1083}
1084
1085static void cp210x_enable_event_mode(struct usb_serial_port *port)
1086{
1087	struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1088	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1089	int ret;
1090
1091	if (port_priv->event_mode)
1092		return;
1093
1094	if (priv->no_event_mode)
1095		return;
1096
1097	port_priv->event_state = ES_DATA;
1098	port_priv->event_mode = true;
1099
1100	ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR);
1101	if (ret) {
1102		dev_err(&port->dev, "failed to enable events: %d\n", ret);
1103		port_priv->event_mode = false;
1104	}
1105}
1106
1107static void cp210x_disable_event_mode(struct usb_serial_port *port)
1108{
1109	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1110	int ret;
1111
1112	if (!port_priv->event_mode)
1113		return;
1114
1115	ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0);
1116	if (ret) {
1117		dev_err(&port->dev, "failed to disable events: %d\n", ret);
1118		return;
1119	}
1120
1121	port_priv->event_mode = false;
1122}
1123
1124static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b)
1125{
1126	bool iflag_change, cc_change;
1127
1128	iflag_change = ((a->c_iflag ^ b->c_iflag) & (INPCK | IXON | IXOFF));
1129	cc_change = a->c_cc[VSTART] != b->c_cc[VSTART] ||
1130			a->c_cc[VSTOP] != b->c_cc[VSTOP];
1131
1132	return tty_termios_hw_change(a, b) || iflag_change || cc_change;
1133}
1134
1135static void cp210x_set_flow_control(struct tty_struct *tty,
1136				    struct usb_serial_port *port,
1137				    const struct ktermios *old_termios)
1138{
1139	struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1140	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1141	struct cp210x_special_chars chars;
1142	struct cp210x_flow_ctl flow_ctl;
1143	u32 flow_repl;
1144	u32 ctl_hs;
1145	bool crtscts;
1146	int ret;
1147
1148	/*
1149	 * Some CP2102N interpret ulXonLimit as ulFlowReplace (erratum
1150	 * CP2102N_E104). Report back that flow control is not supported.
1151	 */
1152	if (priv->no_flow_control) {
1153		tty->termios.c_cflag &= ~CRTSCTS;
1154		tty->termios.c_iflag &= ~(IXON | IXOFF);
1155	}
1156
1157	if (tty->termios.c_ospeed != 0 &&
1158			old_termios && old_termios->c_ospeed != 0 &&
1159			C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) &&
1160			I_IXON(tty) == (old_termios->c_iflag & IXON) &&
1161			I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) &&
1162			START_CHAR(tty) == old_termios->c_cc[VSTART] &&
1163			STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) {
1164		return;
1165	}
1166
1167	if (I_IXON(tty) || I_IXOFF(tty)) {
1168		memset(&chars, 0, sizeof(chars));
1169
1170		chars.bXonChar = START_CHAR(tty);
1171		chars.bXoffChar = STOP_CHAR(tty);
1172
1173		ret = cp210x_write_reg_block(port, CP210X_SET_CHARS, &chars,
1174				sizeof(chars));
1175		if (ret) {
1176			dev_err(&port->dev, "failed to set special chars: %d\n",
1177					ret);
1178		}
1179	}
1180
1181	mutex_lock(&port_priv->mutex);
1182
1183	if (tty->termios.c_ospeed == 0) {
1184		port_priv->dtr = false;
1185		port_priv->rts = false;
1186	} else if (old_termios && old_termios->c_ospeed == 0) {
1187		port_priv->dtr = true;
1188		port_priv->rts = true;
1189	}
1190
1191	ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1192			sizeof(flow_ctl));
1193	if (ret)
1194		goto out_unlock;
1195
1196	ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1197	flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1198
1199	ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1200	ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1201	ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1202	ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1203	if (port_priv->dtr)
1204		ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
1205	else
1206		ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
1207
1208	flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1209	if (C_CRTSCTS(tty)) {
1210		ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1211		if (port_priv->rts)
1212			flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
1213		else
1214			flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1215		crtscts = true;
1216	} else {
1217		ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1218		if (port_priv->rts)
1219			flow_repl |= CP210X_SERIAL_RTS_ACTIVE;
1220		else
1221			flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1222		crtscts = false;
1223	}
1224
1225	if (I_IXOFF(tty)) {
1226		flow_repl |= CP210X_SERIAL_AUTO_RECEIVE;
1227
1228		flow_ctl.ulXonLimit = cpu_to_le32(128);
1229		flow_ctl.ulXoffLimit = cpu_to_le32(128);
1230	} else {
1231		flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE;
1232	}
1233
1234	if (I_IXON(tty))
1235		flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT;
1236	else
1237		flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT;
1238
1239	dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__,
1240			ctl_hs, flow_repl);
1241
1242	flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1243	flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1244
1245	ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1246			sizeof(flow_ctl));
1247	if (ret)
1248		goto out_unlock;
1249
1250	port_priv->crtscts = crtscts;
1251out_unlock:
1252	mutex_unlock(&port_priv->mutex);
1253}
1254
1255static void cp210x_set_termios(struct tty_struct *tty,
1256		               struct usb_serial_port *port,
1257		               const struct ktermios *old_termios)
1258{
1259	struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
 
1260	u16 bits;
1261	int ret;
1262
1263	if (old_termios && !cp210x_termios_change(&tty->termios, old_termios) &&
1264			tty->termios.c_ospeed != 0)
1265		return;
1266
1267	if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed)
1268		cp210x_change_speed(tty, port, old_termios);
1269
1270	/* CP2101 only supports CS8, 1 stop bit and non-stick parity. */
1271	if (priv->partnum == CP210X_PARTNUM_CP2101) {
1272		tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR);
1273		tty->termios.c_cflag |= CS8;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1274	}
1275
1276	bits = 0;
1277
1278	switch (C_CSIZE(tty)) {
1279	case CS5:
1280		bits |= BITS_DATA_5;
1281		break;
1282	case CS6:
1283		bits |= BITS_DATA_6;
1284		break;
1285	case CS7:
1286		bits |= BITS_DATA_7;
1287		break;
1288	case CS8:
1289	default:
1290		bits |= BITS_DATA_8;
1291		break;
 
 
 
 
 
 
 
 
 
1292	}
1293
1294	if (C_PARENB(tty)) {
1295		if (C_CMSPAR(tty)) {
1296			if (C_PARODD(tty))
1297				bits |= BITS_PARITY_MARK;
1298			else
1299				bits |= BITS_PARITY_SPACE;
1300		} else {
1301			if (C_PARODD(tty))
1302				bits |= BITS_PARITY_ODD;
1303			else
1304				bits |= BITS_PARITY_EVEN;
1305		}
 
 
1306	}
1307
1308	if (C_CSTOPB(tty))
1309		bits |= BITS_STOP_2;
1310	else
1311		bits |= BITS_STOP_1;
1312
1313	ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1314	if (ret)
1315		dev_err(&port->dev, "failed to set line control: %d\n", ret);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1316
1317	cp210x_set_flow_control(tty, port, old_termios);
 
 
 
 
 
 
 
 
 
 
 
 
1318
1319	/*
1320	 * Enable event-insertion mode only if input parity checking is
1321	 * enabled for now.
1322	 */
1323	if (I_INPCK(tty))
1324		cp210x_enable_event_mode(port);
1325	else
1326		cp210x_disable_event_mode(port);
1327}
1328
1329static int cp210x_tiocmset(struct tty_struct *tty,
1330		unsigned int set, unsigned int clear)
1331{
1332	struct usb_serial_port *port = tty->driver_data;
1333	return cp210x_tiocmset_port(port, set, clear);
1334}
1335
1336static int cp210x_tiocmset_port(struct usb_serial_port *port,
1337		unsigned int set, unsigned int clear)
1338{
1339	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1340	struct cp210x_flow_ctl flow_ctl;
1341	u32 ctl_hs, flow_repl;
1342	u16 control = 0;
1343	int ret;
1344
1345	mutex_lock(&port_priv->mutex);
1346
1347	if (set & TIOCM_RTS) {
1348		port_priv->rts = true;
1349		control |= CONTROL_RTS;
1350		control |= CONTROL_WRITE_RTS;
1351	}
1352	if (set & TIOCM_DTR) {
1353		port_priv->dtr = true;
1354		control |= CONTROL_DTR;
1355		control |= CONTROL_WRITE_DTR;
1356	}
1357	if (clear & TIOCM_RTS) {
1358		port_priv->rts = false;
1359		control &= ~CONTROL_RTS;
1360		control |= CONTROL_WRITE_RTS;
1361	}
1362	if (clear & TIOCM_DTR) {
1363		port_priv->dtr = false;
1364		control &= ~CONTROL_DTR;
1365		control |= CONTROL_WRITE_DTR;
1366	}
1367
1368	/*
1369	 * Use SET_FLOW to set DTR and enable/disable auto-RTS when hardware
1370	 * flow control is enabled.
1371	 */
1372	if (port_priv->crtscts && control & CONTROL_WRITE_RTS) {
1373		ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1374				sizeof(flow_ctl));
1375		if (ret)
1376			goto out_unlock;
1377
1378		ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1379		flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1380
1381		ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1382		if (port_priv->dtr)
1383			ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
1384		else
1385			ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
1386
1387		flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1388		if (port_priv->rts)
1389			flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
1390		else
1391			flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1392
1393		flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1394		flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1395
1396		dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n",
1397				__func__, ctl_hs, flow_repl);
1398
1399		ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1400				sizeof(flow_ctl));
1401	} else {
1402		dev_dbg(&port->dev, "%s - control = 0x%04x\n", __func__, control);
1403
1404		ret = cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1405	}
1406out_unlock:
1407	mutex_unlock(&port_priv->mutex);
1408
1409	return ret;
1410}
1411
1412static void cp210x_dtr_rts(struct usb_serial_port *port, int on)
1413{
1414	if (on)
1415		cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0);
1416	else
1417		cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS);
1418}
1419
1420static int cp210x_tiocmget(struct tty_struct *tty)
1421{
1422	struct usb_serial_port *port = tty->driver_data;
1423	u8 control;
1424	int result;
1425
1426	result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1427	if (result)
1428		return result;
1429
1430	result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1431		|((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1432		|((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1433		|((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1434		|((control & CONTROL_RING)? TIOCM_RI  : 0)
1435		|((control & CONTROL_DCD) ? TIOCM_CD  : 0);
1436
1437	dev_dbg(&port->dev, "%s - control = 0x%02x\n", __func__, control);
1438
1439	return result;
1440}
1441
1442static int cp210x_break_ctl(struct tty_struct *tty, int break_state)
1443{
1444	struct usb_serial_port *port = tty->driver_data;
1445	struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1446	u16 state;
1447
1448	if (priv->partnum == CP210X_PARTNUM_CP2105) {
1449		if (cp210x_interface_num(port->serial) == 1)
1450			return -ENOTTY;
1451	}
1452
1453	if (break_state == 0)
1454		state = BREAK_OFF;
1455	else
1456		state = BREAK_ON;
1457
1458	dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1459		state == BREAK_OFF ? "off" : "on");
1460
1461	return cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1462}
1463
1464#ifdef CONFIG_GPIOLIB
1465static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1466{
1467	struct usb_serial *serial = gpiochip_get_data(gc);
1468	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1469	u8 req_type;
1470	u16 mask;
1471	int result;
1472	int len;
1473
1474	result = usb_autopm_get_interface(serial->interface);
1475	if (result)
1476		return result;
1477
1478	switch (priv->partnum) {
1479	case CP210X_PARTNUM_CP2105:
1480		req_type = REQTYPE_INTERFACE_TO_HOST;
1481		len = 1;
1482		break;
1483	case CP210X_PARTNUM_CP2108:
1484		req_type = REQTYPE_INTERFACE_TO_HOST;
1485		len = 2;
1486		break;
1487	default:
1488		req_type = REQTYPE_DEVICE_TO_HOST;
1489		len = 1;
1490		break;
1491	}
1492
1493	mask = 0;
1494	result = cp210x_read_vendor_block(serial, req_type, CP210X_READ_LATCH,
1495					  &mask, len);
1496
1497	usb_autopm_put_interface(serial->interface);
 
 
 
 
1498
 
 
1499	if (result < 0)
1500		return result;
1501
1502	le16_to_cpus(&mask);
1503
1504	return !!(mask & BIT(gpio));
1505}
1506
1507static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1508{
1509	struct usb_serial *serial = gpiochip_get_data(gc);
1510	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1511	struct cp210x_gpio_write16 buf16;
1512	struct cp210x_gpio_write buf;
1513	u16 mask, state;
1514	u16 wIndex;
1515	int result;
1516
1517	if (value == 1)
1518		state = BIT(gpio);
1519	else
1520		state = 0;
1521
1522	mask = BIT(gpio);
1523
1524	result = usb_autopm_get_interface(serial->interface);
1525	if (result)
1526		goto out;
1527
1528	switch (priv->partnum) {
1529	case CP210X_PARTNUM_CP2105:
1530		buf.mask = (u8)mask;
1531		buf.state = (u8)state;
1532		result = cp210x_write_vendor_block(serial,
1533						   REQTYPE_HOST_TO_INTERFACE,
1534						   CP210X_WRITE_LATCH, &buf,
1535						   sizeof(buf));
1536		break;
1537	case CP210X_PARTNUM_CP2108:
1538		buf16.mask = cpu_to_le16(mask);
1539		buf16.state = cpu_to_le16(state);
1540		result = cp210x_write_vendor_block(serial,
1541						   REQTYPE_HOST_TO_INTERFACE,
1542						   CP210X_WRITE_LATCH, &buf16,
1543						   sizeof(buf16));
1544		break;
1545	default:
1546		wIndex = state << 8 | mask;
1547		result = usb_control_msg(serial->dev,
1548					 usb_sndctrlpipe(serial->dev, 0),
1549					 CP210X_VENDOR_SPECIFIC,
1550					 REQTYPE_HOST_TO_DEVICE,
1551					 CP210X_WRITE_LATCH,
1552					 wIndex,
1553					 NULL, 0, USB_CTRL_SET_TIMEOUT);
1554		break;
1555	}
1556
1557	usb_autopm_put_interface(serial->interface);
1558out:
1559	if (result < 0) {
1560		dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n",
1561				result);
1562	}
1563}
1564
1565static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1566{
1567	struct usb_serial *serial = gpiochip_get_data(gc);
1568	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1569
1570	return priv->gpio_input & BIT(gpio);
1571}
1572
1573static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1574{
1575	struct usb_serial *serial = gpiochip_get_data(gc);
1576	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1577
1578	if (priv->partnum == CP210X_PARTNUM_CP2105) {
1579		/* hardware does not support an input mode */
1580		return -ENOTSUPP;
1581	}
1582
1583	/* push-pull pins cannot be changed to be inputs */
1584	if (priv->gpio_pushpull & BIT(gpio))
1585		return -EINVAL;
1586
1587	/* make sure to release pin if it is being driven low */
1588	cp210x_gpio_set(gc, gpio, 1);
1589
1590	priv->gpio_input |= BIT(gpio);
1591
1592	return 0;
1593}
1594
1595static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1596					int value)
1597{
1598	struct usb_serial *serial = gpiochip_get_data(gc);
1599	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1600
1601	priv->gpio_input &= ~BIT(gpio);
1602	cp210x_gpio_set(gc, gpio, value);
1603
1604	return 0;
1605}
1606
1607static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1608				  unsigned long config)
1609{
1610	struct usb_serial *serial = gpiochip_get_data(gc);
1611	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1612	enum pin_config_param param = pinconf_to_config_param(config);
1613
1614	/* Succeed only if in correct mode (this can't be set at runtime) */
1615	if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1616	    (priv->gpio_pushpull & BIT(gpio)))
1617		return 0;
1618
1619	if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1620	    !(priv->gpio_pushpull & BIT(gpio)))
1621		return 0;
1622
1623	return -ENOTSUPP;
1624}
1625
1626static int cp210x_gpio_init_valid_mask(struct gpio_chip *gc,
1627		unsigned long *valid_mask, unsigned int ngpios)
1628{
1629	struct usb_serial *serial = gpiochip_get_data(gc);
1630	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1631	struct device *dev = &serial->interface->dev;
1632	unsigned long altfunc_mask = priv->gpio_altfunc;
1633
1634	bitmap_complement(valid_mask, &altfunc_mask, ngpios);
1635
1636	if (bitmap_empty(valid_mask, ngpios))
1637		dev_dbg(dev, "no pin configured for GPIO\n");
1638	else
1639		dev_dbg(dev, "GPIO.%*pbl configured for GPIO\n", ngpios,
1640				valid_mask);
1641	return 0;
1642}
1643
1644/*
1645 * This function is for configuring GPIO using shared pins, where other signals
1646 * are made unavailable by configuring the use of GPIO. This is believed to be
1647 * only applicable to the cp2105 at this point, the other devices supported by
1648 * this driver that provide GPIO do so in a way that does not impact other
1649 * signals and are thus expected to have very different initialisation.
1650 */
1651static int cp2105_gpioconf_init(struct usb_serial *serial)
1652{
1653	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1654	struct cp210x_pin_mode mode;
1655	struct cp210x_dual_port_config config;
1656	u8 intf_num = cp210x_interface_num(serial);
1657	u8 iface_config;
1658	int result;
1659
1660	result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1661					  CP210X_GET_DEVICEMODE, &mode,
1662					  sizeof(mode));
1663	if (result < 0)
1664		return result;
1665
1666	result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1667					  CP210X_GET_PORTCONFIG, &config,
1668					  sizeof(config));
1669	if (result < 0)
1670		return result;
1671
1672	/*  2 banks of GPIO - One for the pins taken from each serial port */
1673	if (intf_num == 0) {
1674		priv->gc.ngpio = 2;
1675
1676		if (mode.eci == CP210X_PIN_MODE_MODEM) {
1677			/* mark all GPIOs of this interface as reserved */
1678			priv->gpio_altfunc = 0xff;
1679			return 0;
1680		}
1681
1682		iface_config = config.eci_cfg;
1683		priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1684						CP210X_ECI_GPIO_MODE_MASK) >>
1685						CP210X_ECI_GPIO_MODE_OFFSET);
 
1686	} else if (intf_num == 1) {
1687		priv->gc.ngpio = 3;
1688
1689		if (mode.sci == CP210X_PIN_MODE_MODEM) {
1690			/* mark all GPIOs of this interface as reserved */
1691			priv->gpio_altfunc = 0xff;
1692			return 0;
1693		}
1694
1695		iface_config = config.sci_cfg;
1696		priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1697						CP210X_SCI_GPIO_MODE_MASK) >>
1698						CP210X_SCI_GPIO_MODE_OFFSET);
 
1699	} else {
1700		return -ENODEV;
1701	}
1702
1703	/* mark all pins which are not in GPIO mode */
1704	if (iface_config & CP2105_GPIO0_TXLED_MODE)	/* GPIO 0 */
1705		priv->gpio_altfunc |= BIT(0);
1706	if (iface_config & (CP2105_GPIO1_RXLED_MODE |	/* GPIO 1 */
1707			CP2105_GPIO1_RS485_MODE))
1708		priv->gpio_altfunc |= BIT(1);
1709
1710	/* driver implementation for CP2105 only supports outputs */
1711	priv->gpio_input = 0;
1712
1713	return 0;
1714}
1715
1716static int cp2104_gpioconf_init(struct usb_serial *serial)
1717{
1718	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1719	struct cp210x_single_port_config config;
1720	u8 iface_config;
1721	u8 gpio_latch;
1722	int result;
1723	u8 i;
1724
1725	result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1726					  CP210X_GET_PORTCONFIG, &config,
1727					  sizeof(config));
1728	if (result < 0)
1729		return result;
1730
1731	priv->gc.ngpio = 4;
1732
1733	iface_config = config.device_cfg;
1734	priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1735					CP210X_GPIO_MODE_MASK) >>
1736					CP210X_GPIO_MODE_OFFSET);
1737	gpio_latch = (u8)((le16_to_cpu(config.reset_state) &
1738					CP210X_GPIO_MODE_MASK) >>
1739					CP210X_GPIO_MODE_OFFSET);
1740
1741	/* mark all pins which are not in GPIO mode */
1742	if (iface_config & CP2104_GPIO0_TXLED_MODE)	/* GPIO 0 */
1743		priv->gpio_altfunc |= BIT(0);
1744	if (iface_config & CP2104_GPIO1_RXLED_MODE)	/* GPIO 1 */
1745		priv->gpio_altfunc |= BIT(1);
1746	if (iface_config & CP2104_GPIO2_RS485_MODE)	/* GPIO 2 */
1747		priv->gpio_altfunc |= BIT(2);
1748
1749	/*
1750	 * Like CP2102N, CP2104 has also no strict input and output pin
1751	 * modes.
1752	 * Do the same input mode emulation as CP2102N.
1753	 */
1754	for (i = 0; i < priv->gc.ngpio; ++i) {
1755		/*
1756		 * Set direction to "input" iff pin is open-drain and reset
1757		 * value is 1.
1758		 */
1759		if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1760			priv->gpio_input |= BIT(i);
1761	}
1762
1763	return 0;
1764}
1765
1766static int cp2108_gpio_init(struct usb_serial *serial)
1767{
1768	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1769	struct cp210x_quad_port_config config;
1770	u16 gpio_latch;
1771	int result;
1772	u8 i;
1773
1774	result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1775					  CP210X_GET_PORTCONFIG, &config,
1776					  sizeof(config));
1777	if (result < 0)
1778		return result;
1779
1780	priv->gc.ngpio = 16;
1781	priv->gpio_pushpull = le16_to_cpu(config.reset_state.gpio_mode_pb1);
1782	gpio_latch = le16_to_cpu(config.reset_state.gpio_latch_pb1);
1783
1784	/*
1785	 * Mark all pins which are not in GPIO mode.
1786	 *
1787	 * Refer to table 9.1 "GPIO Mode alternate Functions" in the datasheet:
1788	 * https://www.silabs.com/documents/public/data-sheets/cp2108-datasheet.pdf
1789	 *
1790	 * Alternate functions of GPIO0 to GPIO3 are determine by enhancedfxn_ifc[0]
1791	 * and the similarly for the other pins; enhancedfxn_ifc[1]: GPIO4 to GPIO7,
1792	 * enhancedfxn_ifc[2]: GPIO8 to GPIO11, enhancedfxn_ifc[3]: GPIO12 to GPIO15.
1793	 */
1794	for (i = 0; i < 4; i++) {
1795		if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_TXLED)
1796			priv->gpio_altfunc |= BIT(i * 4);
1797		if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RXLED)
1798			priv->gpio_altfunc |= BIT((i * 4) + 1);
1799		if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RS485)
1800			priv->gpio_altfunc |= BIT((i * 4) + 2);
1801		if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_CLOCK)
1802			priv->gpio_altfunc |= BIT((i * 4) + 3);
1803	}
1804
1805	/*
1806	 * Like CP2102N, CP2108 has also no strict input and output pin
1807	 * modes. Do the same input mode emulation as CP2102N.
1808	 */
1809	for (i = 0; i < priv->gc.ngpio; ++i) {
1810		/*
1811		 * Set direction to "input" iff pin is open-drain and reset
1812		 * value is 1.
1813		 */
1814		if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1815			priv->gpio_input |= BIT(i);
1816	}
1817
1818	return 0;
1819}
1820
1821static int cp2102n_gpioconf_init(struct usb_serial *serial)
1822{
1823	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1824	const u16 config_size = 0x02a6;
1825	u8 gpio_rst_latch;
1826	u8 config_version;
1827	u8 gpio_pushpull;
1828	u8 *config_buf;
1829	u8 gpio_latch;
1830	u8 gpio_ctrl;
1831	int result;
1832	u8 i;
1833
1834	/*
1835	 * Retrieve device configuration from the device.
1836	 * The array received contains all customization settings done at the
1837	 * factory/manufacturer. Format of the array is documented at the
1838	 * time of writing at:
1839	 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa
1840	 */
1841	config_buf = kmalloc(config_size, GFP_KERNEL);
1842	if (!config_buf)
1843		return -ENOMEM;
1844
1845	result = cp210x_read_vendor_block(serial,
1846					  REQTYPE_DEVICE_TO_HOST,
1847					  CP210X_READ_2NCONFIG,
1848					  config_buf,
1849					  config_size);
1850	if (result < 0) {
1851		kfree(config_buf);
1852		return result;
1853	}
1854
1855	config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX];
1856	gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX];
1857	gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX];
1858	gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX];
1859
1860	kfree(config_buf);
1861
1862	/* Make sure this is a config format we understand. */
1863	if (config_version != 0x01)
1864		return -ENOTSUPP;
1865
1866	priv->gc.ngpio = 4;
1867
1868	/*
1869	 * Get default pin states after reset. Needed so we can determine
1870	 * the direction of an open-drain pin.
1871	 */
1872	gpio_latch = (gpio_rst_latch >> 3) & 0x0f;
1873
1874	/* 0 indicates open-drain mode, 1 is push-pull */
1875	priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f;
1876
1877	/* 0 indicates GPIO mode, 1 is alternate function */
1878	if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) {
1879		/* QFN20 is special... */
1880		if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE)   /* GPIO 0 */
1881			priv->gpio_altfunc |= BIT(0);
1882		if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */
1883			priv->gpio_altfunc |= BIT(1);
1884		if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */
1885			priv->gpio_altfunc |= BIT(2);
1886		if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */
1887			priv->gpio_altfunc |= BIT(3);
1888	} else {
1889		priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f;
1890	}
1891
1892	if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) {
1893		/*
1894		 * For the QFN28 package, GPIO4-6 are controlled by
1895		 * the low three bits of the mode/latch fields.
1896		 * Contrary to the document linked above, the bits for
1897		 * the SUSPEND pins are elsewhere.  No alternate
1898		 * function is available for these pins.
1899		 */
1900		priv->gc.ngpio = 7;
1901		gpio_latch |= (gpio_rst_latch & 7) << 4;
1902		priv->gpio_pushpull |= (gpio_pushpull & 7) << 4;
1903	}
1904
1905	/*
1906	 * The CP2102N does not strictly has input and output pin modes,
1907	 * it only knows open-drain and push-pull modes which is set at
1908	 * factory. An open-drain pin can function both as an
1909	 * input or an output. We emulate input mode for open-drain pins
1910	 * by making sure they are not driven low, and we do not allow
1911	 * push-pull pins to be set as an input.
1912	 */
1913	for (i = 0; i < priv->gc.ngpio; ++i) {
1914		/*
1915		 * Set direction to "input" iff pin is open-drain and reset
1916		 * value is 1.
1917		 */
1918		if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1919			priv->gpio_input |= BIT(i);
1920	}
1921
1922	return 0;
1923}
1924
1925static int cp210x_gpio_init(struct usb_serial *serial)
1926{
1927	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1928	int result;
1929
1930	switch (priv->partnum) {
1931	case CP210X_PARTNUM_CP2104:
1932		result = cp2104_gpioconf_init(serial);
1933		break;
1934	case CP210X_PARTNUM_CP2105:
1935		result = cp2105_gpioconf_init(serial);
1936		break;
1937	case CP210X_PARTNUM_CP2108:
1938		/*
1939		 * The GPIOs are not tied to any specific port so only register
1940		 * once for interface 0.
1941		 */
1942		if (cp210x_interface_num(serial) != 0)
1943			return 0;
1944		result = cp2108_gpio_init(serial);
1945		break;
1946	case CP210X_PARTNUM_CP2102N_QFN28:
1947	case CP210X_PARTNUM_CP2102N_QFN24:
1948	case CP210X_PARTNUM_CP2102N_QFN20:
1949		result = cp2102n_gpioconf_init(serial);
1950		break;
1951	default:
1952		return 0;
1953	}
1954
1955	if (result < 0)
1956		return result;
1957
1958	priv->gc.label = "cp210x";
 
1959	priv->gc.get_direction = cp210x_gpio_direction_get;
1960	priv->gc.direction_input = cp210x_gpio_direction_input;
1961	priv->gc.direction_output = cp210x_gpio_direction_output;
1962	priv->gc.get = cp210x_gpio_get;
1963	priv->gc.set = cp210x_gpio_set;
1964	priv->gc.set_config = cp210x_gpio_set_config;
1965	priv->gc.init_valid_mask = cp210x_gpio_init_valid_mask;
1966	priv->gc.owner = THIS_MODULE;
1967	priv->gc.parent = &serial->interface->dev;
1968	priv->gc.base = -1;
1969	priv->gc.can_sleep = true;
1970
1971	result = gpiochip_add_data(&priv->gc, serial);
1972	if (!result)
1973		priv->gpio_registered = true;
1974
1975	return result;
1976}
1977
1978static void cp210x_gpio_remove(struct usb_serial *serial)
1979{
1980	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1981
1982	if (priv->gpio_registered) {
1983		gpiochip_remove(&priv->gc);
1984		priv->gpio_registered = false;
1985	}
1986}
1987
1988#else
1989
1990static int cp210x_gpio_init(struct usb_serial *serial)
1991{
1992	return 0;
1993}
1994
1995static void cp210x_gpio_remove(struct usb_serial *serial)
1996{
1997	/* Nothing to do */
1998}
1999
2000#endif
2001
2002static int cp210x_port_probe(struct usb_serial_port *port)
2003{
2004	struct usb_serial *serial = port->serial;
2005	struct cp210x_port_private *port_priv;
 
2006
2007	port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
2008	if (!port_priv)
2009		return -ENOMEM;
2010
2011	port_priv->bInterfaceNumber = cp210x_interface_num(serial);
2012	mutex_init(&port_priv->mutex);
2013
2014	usb_set_serial_port_data(port, port_priv);
2015
 
 
 
 
 
 
2016	return 0;
2017}
2018
2019static void cp210x_port_remove(struct usb_serial_port *port)
2020{
2021	struct cp210x_port_private *port_priv;
2022
2023	port_priv = usb_get_serial_port_data(port);
2024	kfree(port_priv);
2025}
2026
2027static void cp210x_init_max_speed(struct usb_serial *serial)
2028{
2029	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2030	bool use_actual_rate = false;
2031	speed_t min = 300;
2032	speed_t max;
2033
2034	switch (priv->partnum) {
2035	case CP210X_PARTNUM_CP2101:
2036		max = 921600;
2037		break;
2038	case CP210X_PARTNUM_CP2102:
2039	case CP210X_PARTNUM_CP2103:
2040		max = 1000000;
2041		break;
2042	case CP210X_PARTNUM_CP2104:
2043		use_actual_rate = true;
2044		max = 2000000;
2045		break;
2046	case CP210X_PARTNUM_CP2108:
2047		max = 2000000;
2048		break;
2049	case CP210X_PARTNUM_CP2105:
2050		if (cp210x_interface_num(serial) == 0) {
2051			use_actual_rate = true;
2052			max = 2000000;	/* ECI */
2053		} else {
2054			min = 2400;
2055			max = 921600;	/* SCI */
2056		}
2057		break;
2058	case CP210X_PARTNUM_CP2102N_QFN28:
2059	case CP210X_PARTNUM_CP2102N_QFN24:
2060	case CP210X_PARTNUM_CP2102N_QFN20:
2061		use_actual_rate = true;
2062		max = 3000000;
2063		break;
2064	default:
2065		max = 2000000;
2066		break;
2067	}
2068
2069	priv->min_speed = min;
2070	priv->max_speed = max;
2071	priv->use_actual_rate = use_actual_rate;
2072}
2073
2074static void cp2102_determine_quirks(struct usb_serial *serial)
2075{
2076	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2077	u8 *buf;
2078	int ret;
2079
2080	buf = kmalloc(2, GFP_KERNEL);
2081	if (!buf)
2082		return;
2083	/*
2084	 * Some (possibly counterfeit) CP2102 do not support event-insertion
2085	 * mode and respond differently to malformed vendor requests.
2086	 * Specifically, they return one instead of two bytes when sent a
2087	 * two-byte part-number request.
2088	 */
2089	ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2090			CP210X_VENDOR_SPECIFIC, REQTYPE_DEVICE_TO_HOST,
2091			CP210X_GET_PARTNUM, 0, buf, 2, USB_CTRL_GET_TIMEOUT);
2092	if (ret == 1) {
2093		dev_dbg(&serial->interface->dev,
2094				"device does not support event-insertion mode\n");
2095		priv->no_event_mode = true;
2096	}
2097
2098	kfree(buf);
2099}
2100
2101static int cp210x_get_fw_version(struct usb_serial *serial, u16 value)
2102{
2103	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2104	u8 ver[3];
2105	int ret;
2106
2107	ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, value,
2108			ver, sizeof(ver));
2109	if (ret)
2110		return ret;
2111
2112	dev_dbg(&serial->interface->dev, "%s - %d.%d.%d\n", __func__,
2113			ver[0], ver[1], ver[2]);
2114
2115	priv->fw_version = ver[0] << 16 | ver[1] << 8 | ver[2];
2116
2117	return 0;
2118}
2119
2120static void cp210x_determine_type(struct usb_serial *serial)
2121{
2122	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2123	int ret;
2124
2125	ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
2126			CP210X_GET_PARTNUM, &priv->partnum,
2127			sizeof(priv->partnum));
2128	if (ret < 0) {
2129		dev_warn(&serial->interface->dev,
2130				"querying part number failed\n");
2131		priv->partnum = CP210X_PARTNUM_UNKNOWN;
2132		return;
2133	}
2134
2135	dev_dbg(&serial->interface->dev, "partnum = 0x%02x\n", priv->partnum);
2136
2137	switch (priv->partnum) {
2138	case CP210X_PARTNUM_CP2102:
2139		cp2102_determine_quirks(serial);
2140		break;
2141	case CP210X_PARTNUM_CP2105:
2142	case CP210X_PARTNUM_CP2108:
2143		cp210x_get_fw_version(serial, CP210X_GET_FW_VER);
2144		break;
2145	case CP210X_PARTNUM_CP2102N_QFN28:
2146	case CP210X_PARTNUM_CP2102N_QFN24:
2147	case CP210X_PARTNUM_CP2102N_QFN20:
2148		ret = cp210x_get_fw_version(serial, CP210X_GET_FW_VER_2N);
2149		if (ret)
2150			break;
2151		if (priv->fw_version <= 0x10004)
2152			priv->no_flow_control = true;
2153		break;
2154	default:
2155		break;
2156	}
2157}
2158
2159static int cp210x_attach(struct usb_serial *serial)
2160{
2161	int result;
2162	struct cp210x_serial_private *priv;
2163
2164	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2165	if (!priv)
2166		return -ENOMEM;
2167
2168	usb_set_serial_data(serial, priv);
 
 
 
 
2169
2170	cp210x_determine_type(serial);
2171	cp210x_init_max_speed(serial);
2172
2173	result = cp210x_gpio_init(serial);
2174	if (result < 0) {
2175		dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n",
2176				result);
 
 
2177	}
2178
2179	return 0;
 
 
 
 
2180}
2181
2182static void cp210x_disconnect(struct usb_serial *serial)
2183{
2184	cp210x_gpio_remove(serial);
2185}
2186
2187static void cp210x_release(struct usb_serial *serial)
2188{
2189	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2190
2191	cp210x_gpio_remove(serial);
2192
2193	kfree(priv);
2194}
2195
2196module_usb_serial_driver(serial_drivers, id_table);
2197
2198MODULE_DESCRIPTION(DRIVER_DESC);
2199MODULE_LICENSE("GPL v2");