cp210x.c 62.0 KB
Newer Older
1
// SPDX-License-Identifier: GPL-2.0
L
Linus Torvalds 已提交
2
/*
3
 * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
L
Linus Torvalds 已提交
4 5 6
 *
 * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
 *
7 8 9 10
 * Support to set flow control line levels using TIOCMGET and TIOCMSET
 * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
 * control thanks to Munir Nassar nassarmu@real-time.com
 *
L
Linus Torvalds 已提交
11 12 13 14 15 16 17 18 19 20
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/usb.h>
A
Alan Cox 已提交
21
#include <linux/uaccess.h>
22
#include <linux/usb/serial.h>
23 24 25
#include <linux/gpio/driver.h>
#include <linux/bitops.h>
#include <linux/mutex.h>
L
Linus Torvalds 已提交
26

27
#define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
L
Linus Torvalds 已提交
28 29 30 31

/*
 * Function Prototypes
 */
32
static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
33
static void cp210x_close(struct usb_serial_port *);
J
Johan Hovold 已提交
34
static void cp210x_get_termios(struct tty_struct *, struct usb_serial_port *);
35
static void cp210x_get_termios_port(struct usb_serial_port *port,
36
	tcflag_t *cflagp, unsigned int *baudp);
37 38
static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
							struct ktermios *);
39
static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
A
Alan Cox 已提交
40
							struct ktermios*);
K
Konstantin Shkolnyy 已提交
41
static bool cp210x_tx_empty(struct usb_serial_port *port);
42
static int cp210x_tiocmget(struct tty_struct *);
43 44
static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
static int cp210x_tiocmset_port(struct usb_serial_port *port,
45
		unsigned int, unsigned int);
46
static void cp210x_break_ctl(struct tty_struct *, int);
47 48 49
static int cp210x_attach(struct usb_serial *);
static void cp210x_disconnect(struct usb_serial *);
static void cp210x_release(struct usb_serial *);
50 51
static int cp210x_port_probe(struct usb_serial_port *);
static int cp210x_port_remove(struct usb_serial_port *);
A
Alan Cox 已提交
52
static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
53 54 55
static void cp210x_process_read_urb(struct urb *urb);
static void cp210x_enable_event_mode(struct usb_serial_port *port);
static void cp210x_disable_event_mode(struct usb_serial_port *port);
L
Linus Torvalds 已提交
56

57
static const struct usb_device_id id_table[] = {
58
	{ USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
M
M Kondrin 已提交
59
	{ USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
C
Craig Shelley 已提交
60
	{ USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
61
	{ USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
C
Craig Shelley 已提交
62
	{ USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
63
	{ USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
64
	{ USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
C
Craig Shelley 已提交
65
	{ USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
66
	{ USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
67
	{ USB_DEVICE(0x0B00, 0x3070) }, /* Ingenico 3070 */
68 69
	{ USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
	{ USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
70
	{ USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
71
	{ USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
C
Craig Shelley 已提交
72
	{ USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
73
	{ USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
74
	{ USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
75 76
	{ USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
	{ USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
C
Craig Shelley 已提交
77
	{ USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
78 79
	{ USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
	{ USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
C
Craig Shelley 已提交
80
	{ USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
81
	{ USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
82 83
	{ USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
	{ USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
C
Craig Shelley 已提交
84
	{ USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
85
	{ USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
86
	{ USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */
V
Vitja Makarov 已提交
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 */
C
Craig Shelley 已提交
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 */
C
Craig Shelley 已提交
96
	{ USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
97 98
	{ USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
	{ 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 */
C
Craig Shelley 已提交
102
	{ USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
103 104 105
	{ USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */
	{ USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */
	{ USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */
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 */
C
Craig Shelley 已提交
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 */
J
Jeff Long 已提交
115
	{ USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
116
	{ USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
C
Craig Shelley 已提交
117
	{ USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
118
	{ USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
T
Tomasz K 已提交
119
	{ USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
L
Lucas De Marchi 已提交
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 */
123 124 125
	{ USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */
	{ USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */
	{ USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */
126
	{ USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
C
Craig Shelley 已提交
127
	{ USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
128
	{ USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
C
Craig Shelley 已提交
129
	{ USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
130
	{ USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
131
	{ USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */
C
Craig Shelley 已提交
132
	{ USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
C
Craig Shelley 已提交
133
	{ USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
C
Craig Shelley 已提交
134
	{ USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
A
Alex Stephens 已提交
135
	{ USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
136
	{ USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
C
Craig Shelley 已提交
137
	{ USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
138
	{ USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
139
	{ USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */
140
	{ USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */
141
	{ USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */
142 143
	{ USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
	{ USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
144
	{ USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
145 146
	{ USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
	{ USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
147 148
	{ USB_DEVICE(0x10C4, 0x8856) },	/* CEL EM357 ZigBee USB Stick - LR */
	{ USB_DEVICE(0x10C4, 0x8857) },	/* CEL EM357 ZigBee USB Stick */
149 150
	{ USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
	{ USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
151 152
	{ USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */
	{ USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */
153
	{ USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
154
	{ USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
155
	{ USB_DEVICE(0x10C4, 0x8977) },	/* CEL MeshWorks DevKit Device */
156
	{ USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
157
	{ USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */
158
	{ USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */
159
	{ USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
160
	{ USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
161
	{ USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
162
	{ USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
163
	{ USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
164
	{ USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */
165
	{ USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
166
	{ USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
167 168
	{ USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */
	{ USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */
C
Craig Shelley 已提交
169 170 171 172
	{ USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
	{ USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
	{ USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
	{ USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
173
	{ USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
C
Craig Shelley 已提交
174
	{ USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
175 176
	{ USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
	{ USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
177
	{ USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
C
Craig Shelley 已提交
178
	{ USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
179
	{ USB_DEVICE(0x155A, 0x1006) },	/* ELDAT Easywave RX09 */
C
Craig Shelley 已提交
180 181
	{ USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
	{ USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
C
Craig Shelley 已提交
182
	{ USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
C
Craig Shelley 已提交
183 184 185 186
	{ USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
	{ USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
	{ USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
	{ USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
187 188
	{ USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
	{ USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
189
	{ USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
190 191 192 193
	{ USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
	{ USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
	{ USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
	{ USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
194 195
	{ USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
	{ USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
C
Craig Shelley 已提交
196 197 198
	{ USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
	{ USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
	{ USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
199
	{ USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
200
	{ USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
201
	{ USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
202 203
	{ USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
	{ USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
204
	{ USB_DEVICE(0x1901, 0x0194) },	/* GE Healthcare Remote Alarm Box */
205 206
	{ USB_DEVICE(0x1901, 0x0195) },	/* GE B850/B650/B450 CP2104 DP UART interface */
	{ USB_DEVICE(0x1901, 0x0196) },	/* GE B850 CP2105 DP UART interface */
207
	{ USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
208
	{ USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
209
	{ USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
210
	{ USB_DEVICE(0x1BA4, 0x0002) },	/* Silicon Labs 358x factory default */
211
	{ USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
212
	{ USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
C
Craig Shelley 已提交
213 214
	{ USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
	{ USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233
	{ USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
	{ USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
	{ USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
	{ USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
	{ USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
	{ USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
	{ USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
	{ USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
	{ USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
	{ USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
	{ USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
	{ USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
	{ USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
	{ USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
	{ USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
	{ USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
	{ USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
	{ USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
	{ USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
234
	{ USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
235
	{ USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
C
Craig Shelley 已提交
236 237
	{ USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
	{ USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
238
	{ USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
C
Craig Shelley 已提交
239
	{ USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
240
	{ } /* Terminating Entry */
L
Linus Torvalds 已提交
241 242
};

A
Alan Cox 已提交
243
MODULE_DEVICE_TABLE(usb, id_table);
L
Linus Torvalds 已提交
244

245 246 247
struct cp210x_serial_private {
#ifdef CONFIG_GPIOLIB
	struct gpio_chip	gc;
248
	bool			gpio_registered;
249 250 251
	u8			gpio_pushpull;
	u8			gpio_altfunc;
	u8			gpio_input;
252 253
#endif
	u8			partnum;
254
	speed_t			min_speed;
255
	speed_t			max_speed;
256
	bool			use_actual_rate;
257 258
};

259 260 261 262 263 264 265 266 267
enum cp210x_event_state {
	ES_DATA,
	ES_ESCAPE,
	ES_LSR,
	ES_LSR_DATA_0,
	ES_LSR_DATA_1,
	ES_MSR
};

268
struct cp210x_port_private {
269
	__u8			bInterfaceNumber;
270
	bool			has_swapped_line_ctl;
271 272 273
	bool			event_mode;
	enum cp210x_event_state event_state;
	u8 lsr;
274 275
};

276
static struct usb_serial_driver cp210x_device = {
277 278
	.driver = {
		.owner =	THIS_MODULE,
J
Johan Hovold 已提交
279
		.name =		"cp210x",
280
	},
L
Linus Torvalds 已提交
281 282
	.id_table		= id_table,
	.num_ports		= 1,
283
	.bulk_in_size		= 256,
284
	.bulk_out_size		= 256,
285 286 287 288
	.open			= cp210x_open,
	.close			= cp210x_close,
	.break_ctl		= cp210x_break_ctl,
	.set_termios		= cp210x_set_termios,
K
Konstantin Shkolnyy 已提交
289
	.tx_empty		= cp210x_tx_empty,
290 291
	.throttle		= usb_serial_generic_throttle,
	.unthrottle		= usb_serial_generic_unthrottle,
J
Johan Hovold 已提交
292
	.tiocmget		= cp210x_tiocmget,
293
	.tiocmset		= cp210x_tiocmset,
294 295 296
	.attach			= cp210x_attach,
	.disconnect		= cp210x_disconnect,
	.release		= cp210x_release,
297 298
	.port_probe		= cp210x_port_probe,
	.port_remove		= cp210x_port_remove,
299 300
	.dtr_rts		= cp210x_dtr_rts,
	.process_read_urb	= cp210x_process_read_urb,
L
Linus Torvalds 已提交
301 302
};

303 304 305 306
static struct usb_serial_driver * const serial_drivers[] = {
	&cp210x_device, NULL
};

307
/* Config request types */
308 309 310 311
#define REQTYPE_HOST_TO_INTERFACE	0x41
#define REQTYPE_INTERFACE_TO_HOST	0xc1
#define REQTYPE_HOST_TO_DEVICE	0x40
#define REQTYPE_DEVICE_TO_HOST	0xc0
L
Linus Torvalds 已提交
312

313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337
/* Config request codes */
#define CP210X_IFC_ENABLE	0x00
#define CP210X_SET_BAUDDIV	0x01
#define CP210X_GET_BAUDDIV	0x02
#define CP210X_SET_LINE_CTL	0x03
#define CP210X_GET_LINE_CTL	0x04
#define CP210X_SET_BREAK	0x05
#define CP210X_IMM_CHAR		0x06
#define CP210X_SET_MHS		0x07
#define CP210X_GET_MDMSTS	0x08
#define CP210X_SET_XON		0x09
#define CP210X_SET_XOFF		0x0A
#define CP210X_SET_EVENTMASK	0x0B
#define CP210X_GET_EVENTMASK	0x0C
#define CP210X_SET_CHAR		0x0D
#define CP210X_GET_CHARS	0x0E
#define CP210X_GET_PROPS	0x0F
#define CP210X_GET_COMM_STATUS	0x10
#define CP210X_RESET		0x11
#define CP210X_PURGE		0x12
#define CP210X_SET_FLOW		0x13
#define CP210X_GET_FLOW		0x14
#define CP210X_EMBED_EVENTS	0x15
#define CP210X_GET_EVENTSTATE	0x16
#define CP210X_SET_CHARS	0x19
338 339
#define CP210X_GET_BAUDRATE	0x1D
#define CP210X_SET_BAUDRATE	0x1E
340
#define CP210X_VENDOR_SPECIFIC	0xFF
341 342

/* CP210X_IFC_ENABLE */
L
Linus Torvalds 已提交
343 344 345
#define UART_ENABLE		0x0001
#define UART_DISABLE		0x0000

346
/* CP210X_(SET|GET)_BAUDDIV */
L
Linus Torvalds 已提交
347 348
#define BAUD_RATE_GEN_FREQ	0x384000

349
/* CP210X_(SET|GET)_LINE_CTL */
L
Linus Torvalds 已提交
350
#define BITS_DATA_MASK		0X0f00
351
#define BITS_DATA_5		0X0500
L
Linus Torvalds 已提交
352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367
#define BITS_DATA_6		0X0600
#define BITS_DATA_7		0X0700
#define BITS_DATA_8		0X0800
#define BITS_DATA_9		0X0900

#define BITS_PARITY_MASK	0x00f0
#define BITS_PARITY_NONE	0x0000
#define BITS_PARITY_ODD		0x0010
#define BITS_PARITY_EVEN	0x0020
#define BITS_PARITY_MARK	0x0030
#define BITS_PARITY_SPACE	0x0040

#define BITS_STOP_MASK		0x000f
#define BITS_STOP_1		0x0000
#define BITS_STOP_1_5		0x0001
#define BITS_STOP_2		0x0002
368

369
/* CP210X_SET_BREAK */
C
Craig Shelley 已提交
370 371
#define BREAK_ON		0x0001
#define BREAK_OFF		0x0000
L
Linus Torvalds 已提交
372

373
/* CP210X_(SET_MHS|GET_MDMSTS) */
374 375 376 377 378 379 380 381
#define CONTROL_DTR		0x0001
#define CONTROL_RTS		0x0002
#define CONTROL_CTS		0x0010
#define CONTROL_DSR		0x0020
#define CONTROL_RING		0x0040
#define CONTROL_DCD		0x0080
#define CONTROL_WRITE_DTR	0x0100
#define CONTROL_WRITE_RTS	0x0200
L
Linus Torvalds 已提交
382

383
/* CP210X_VENDOR_SPECIFIC values */
384
#define CP210X_READ_2NCONFIG	0x000E
385 386 387 388 389 390 391 392 393 394 395 396 397
#define CP210X_READ_LATCH	0x00C2
#define CP210X_GET_PARTNUM	0x370B
#define CP210X_GET_PORTCONFIG	0x370C
#define CP210X_GET_DEVICEMODE	0x3711
#define CP210X_WRITE_LATCH	0x37E1

/* Part number definitions */
#define CP210X_PARTNUM_CP2101	0x01
#define CP210X_PARTNUM_CP2102	0x02
#define CP210X_PARTNUM_CP2103	0x03
#define CP210X_PARTNUM_CP2104	0x04
#define CP210X_PARTNUM_CP2105	0x05
#define CP210X_PARTNUM_CP2108	0x08
398 399 400
#define CP210X_PARTNUM_CP2102N_QFN28	0x20
#define CP210X_PARTNUM_CP2102N_QFN24	0x21
#define CP210X_PARTNUM_CP2102N_QFN20	0x22
401
#define CP210X_PARTNUM_UNKNOWN	0xFF
402

K
Konstantin Shkolnyy 已提交
403 404 405 406 407 408 409 410 411 412 413
/* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
struct cp210x_comm_status {
	__le32   ulErrors;
	__le32   ulHoldReasons;
	__le32   ulAmountInInQueue;
	__le32   ulAmountInOutQueue;
	u8       bEofReceived;
	u8       bWaitForImmediate;
	u8       bReserved;
} __packed;

414 415 416 417 418 419 420 421
/*
 * CP210X_PURGE - 16 bits passed in wValue of USB request.
 * SiLabs app note AN571 gives a strange description of the 4 bits:
 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
 * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
 */
#define PURGE_ALL		0x000f

422 423 424 425 426 427 428 429 430
/* CP210X_EMBED_EVENTS */
#define CP210X_ESCCHAR		0xec

#define CP210X_LSR_OVERRUN	BIT(1)
#define CP210X_LSR_PARITY	BIT(2)
#define CP210X_LSR_FRAME	BIT(3)
#define CP210X_LSR_BREAK	BIT(4)


431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466
/* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
struct cp210x_flow_ctl {
	__le32	ulControlHandshake;
	__le32	ulFlowReplace;
	__le32	ulXonLimit;
	__le32	ulXoffLimit;
} __packed;

/* cp210x_flow_ctl::ulControlHandshake */
#define CP210X_SERIAL_DTR_MASK		GENMASK(1, 0)
#define CP210X_SERIAL_DTR_SHIFT(_mode)	(_mode)
#define CP210X_SERIAL_CTS_HANDSHAKE	BIT(3)
#define CP210X_SERIAL_DSR_HANDSHAKE	BIT(4)
#define CP210X_SERIAL_DCD_HANDSHAKE	BIT(5)
#define CP210X_SERIAL_DSR_SENSITIVITY	BIT(6)

/* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
#define CP210X_SERIAL_DTR_INACTIVE	0
#define CP210X_SERIAL_DTR_ACTIVE	1
#define CP210X_SERIAL_DTR_FLOW_CTL	2

/* cp210x_flow_ctl::ulFlowReplace */
#define CP210X_SERIAL_AUTO_TRANSMIT	BIT(0)
#define CP210X_SERIAL_AUTO_RECEIVE	BIT(1)
#define CP210X_SERIAL_ERROR_CHAR	BIT(2)
#define CP210X_SERIAL_NULL_STRIPPING	BIT(3)
#define CP210X_SERIAL_BREAK_CHAR	BIT(4)
#define CP210X_SERIAL_RTS_MASK		GENMASK(7, 6)
#define CP210X_SERIAL_RTS_SHIFT(_mode)	(_mode << 6)
#define CP210X_SERIAL_XOFF_CONTINUE	BIT(31)

/* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
#define CP210X_SERIAL_RTS_INACTIVE	0
#define CP210X_SERIAL_RTS_ACTIVE	1
#define CP210X_SERIAL_RTS_FLOW_CTL	2

467 468 469 470 471 472 473 474 475 476
/* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
struct cp210x_pin_mode {
	u8	eci;
	u8	sci;
} __packed;

#define CP210X_PIN_MODE_MODEM		0
#define CP210X_PIN_MODE_GPIO		BIT(0)

/*
477 478
 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes
 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes.
479
 */
480
struct cp210x_dual_port_config {
481 482 483 484 485 486 487 488 489 490
	__le16	gpio_mode;
	u8	__pad0[2];
	__le16	reset_state;
	u8	__pad1[4];
	__le16	suspend_state;
	u8	sci_cfg;
	u8	eci_cfg;
	u8	device_cfg;
} __packed;

491 492 493 494 495 496 497 498 499 500 501 502 503
/*
 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes
 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes.
 */
struct cp210x_single_port_config {
	__le16	gpio_mode;
	u8	__pad0[2];
	__le16	reset_state;
	u8	__pad1[4];
	__le16	suspend_state;
	u8	device_cfg;
} __packed;

504 505 506 507 508 509 510
/* GPIO modes */
#define CP210X_SCI_GPIO_MODE_OFFSET	9
#define CP210X_SCI_GPIO_MODE_MASK	GENMASK(11, 9)

#define CP210X_ECI_GPIO_MODE_OFFSET	2
#define CP210X_ECI_GPIO_MODE_MASK	GENMASK(3, 2)

511 512 513
#define CP210X_GPIO_MODE_OFFSET		8
#define CP210X_GPIO_MODE_MASK		GENMASK(11, 8)

514 515 516 517 518
/* CP2105 port configuration values */
#define CP2105_GPIO0_TXLED_MODE		BIT(0)
#define CP2105_GPIO1_RXLED_MODE		BIT(1)
#define CP2105_GPIO1_RS485_MODE		BIT(2)

519 520 521 522 523
/* CP2104 port configuration values */
#define CP2104_GPIO0_TXLED_MODE		BIT(0)
#define CP2104_GPIO1_RXLED_MODE		BIT(1)
#define CP2104_GPIO2_RS485_MODE		BIT(2)

524 525 526 527 528 529
/* CP2102N configuration array indices */
#define CP210X_2NCONFIG_CONFIG_VERSION_IDX	2
#define CP210X_2NCONFIG_GPIO_MODE_IDX		581
#define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX	587
#define CP210X_2NCONFIG_GPIO_CONTROL_IDX	600

530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547
/* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
struct cp210x_gpio_write {
	u8	mask;
	u8	state;
} __packed;

/*
 * Helper to get interface number when we only have struct usb_serial.
 */
static u8 cp210x_interface_num(struct usb_serial *serial)
{
	struct usb_host_interface *cur_altsetting;

	cur_altsetting = serial->interface->cur_altsetting;

	return cur_altsetting->desc.bInterfaceNumber;
}

548
/*
549 550
 * Reads a variable-sized block of CP210X_ registers, identified by req.
 * Returns data into buf in native USB byte order.
551
 */
552 553
static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
		void *buf, int bufsize)
L
Linus Torvalds 已提交
554 555
{
	struct usb_serial *serial = port->serial;
556
	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
557 558
	void *dmabuf;
	int result;
559

560 561 562 563 564 565 566
	dmabuf = kmalloc(bufsize, GFP_KERNEL);
	if (!dmabuf) {
		/*
		 * FIXME Some callers don't bother to check for error,
		 * at least give them consistent junk until they are fixed
		 */
		memset(buf, 0, bufsize);
567
		return -ENOMEM;
568
	}
L
Linus Torvalds 已提交
569

A
Alan Cox 已提交
570
	result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
571 572 573 574 575 576 577 578 579 580
			req, REQTYPE_INTERFACE_TO_HOST, 0,
			port_priv->bInterfaceNumber, dmabuf, bufsize,
			USB_CTRL_SET_TIMEOUT);
	if (result == bufsize) {
		memcpy(buf, dmabuf, bufsize);
		result = 0;
	} else {
		dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
				req, bufsize, result);
		if (result >= 0)
581
			result = -EIO;
L
Linus Torvalds 已提交
582

583 584 585 586 587 588
		/*
		 * FIXME Some callers don't bother to check for error,
		 * at least give them consistent junk until they are fixed
		 */
		memset(buf, 0, bufsize);
	}
L
Linus Torvalds 已提交
589

590
	kfree(dmabuf);
L
Linus Torvalds 已提交
591

592 593
	return result;
}
594

595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610
/*
 * Reads any 32-bit CP210X_ register identified by req.
 */
static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
{
	__le32 le32_val;
	int err;

	err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
	if (err) {
		/*
		 * FIXME Some callers don't bother to check for error,
		 * at least give them consistent junk until they are fixed
		 */
		*val = 0;
		return err;
611
	}
L
Linus Torvalds 已提交
612

613 614 615 616 617
	*val = le32_to_cpu(le32_val);

	return 0;
}

618 619 620 621 622 623 624 625 626 627 628 629 630
/*
 * Reads any 16-bit CP210X_ register identified by req.
 */
static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
{
	__le16 le16_val;
	int err;

	err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
	if (err)
		return err;

	*val = le16_to_cpu(le16_val);
631

632
	return 0;
L
Linus Torvalds 已提交
633 634
}

635
/*
636 637 638 639 640 641 642
 * Reads any 8-bit CP210X_ register identified by req.
 */
static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
{
	return cp210x_read_reg_block(port, req, val, sizeof(*val));
}

643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676
/*
 * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
 * Returns data into buf in native USB byte order.
 */
static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
				    void *buf, int bufsize)
{
	void *dmabuf;
	int result;

	dmabuf = kmalloc(bufsize, GFP_KERNEL);
	if (!dmabuf)
		return -ENOMEM;

	result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
				 CP210X_VENDOR_SPECIFIC, type, val,
				 cp210x_interface_num(serial), dmabuf, bufsize,
				 USB_CTRL_GET_TIMEOUT);
	if (result == bufsize) {
		memcpy(buf, dmabuf, bufsize);
		result = 0;
	} else {
		dev_err(&serial->interface->dev,
			"failed to get vendor val 0x%04x size %d: %d\n", val,
			bufsize, result);
		if (result >= 0)
			result = -EIO;
	}

	kfree(dmabuf);

	return result;
}

677 678 679
/*
 * Writes any 16-bit CP210X_ register (req) whose value is passed
 * entirely in the wValue field of the USB request.
680
 */
681
static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
L
Linus Torvalds 已提交
682 683
{
	struct usb_serial *serial = port->serial;
684
	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
685 686 687 688 689 690 691 692 693 694 695 696
	int result;

	result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
			req, REQTYPE_HOST_TO_INTERFACE, val,
			port_priv->bInterfaceNumber, NULL, 0,
			USB_CTRL_SET_TIMEOUT);
	if (result < 0) {
		dev_err(&port->dev, "failed set request 0x%x status: %d\n",
				req, result);
	}

	return result;
697
}
L
Linus Torvalds 已提交
698

699 700 701 702 703 704 705 706 707 708 709
/*
 * Writes a variable-sized block of CP210X_ registers, identified by req.
 * Data in buf must be in native USB byte order.
 */
static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
		void *buf, int bufsize)
{
	struct usb_serial *serial = port->serial;
	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
	void *dmabuf;
	int result;
710

711
	dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
712
	if (!dmabuf)
713 714
		return -ENOMEM;

715 716 717 718
	result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
			req, REQTYPE_HOST_TO_INTERFACE, 0,
			port_priv->bInterfaceNumber, dmabuf, bufsize,
			USB_CTRL_SET_TIMEOUT);
L
Linus Torvalds 已提交
719

720
	kfree(dmabuf);
721

722 723 724 725 726 727
	if (result == bufsize) {
		result = 0;
	} else {
		dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
				req, bufsize, result);
		if (result >= 0)
728
			result = -EIO;
729
	}
L
Linus Torvalds 已提交
730

731
	return result;
L
Linus Torvalds 已提交
732 733
}

734
/*
735
 * Writes any 32-bit CP210X_ register identified by req.
736
 */
737
static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
738
{
739 740 741 742 743
	__le32 le32_val;

	le32_val = cpu_to_le32(val);

	return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
744 745
}

746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781
#ifdef CONFIG_GPIOLIB
/*
 * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
 * Data in buf must be in native USB byte order.
 */
static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
				     u16 val, void *buf, int bufsize)
{
	void *dmabuf;
	int result;

	dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
	if (!dmabuf)
		return -ENOMEM;

	result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
				 CP210X_VENDOR_SPECIFIC, type, val,
				 cp210x_interface_num(serial), dmabuf, bufsize,
				 USB_CTRL_SET_TIMEOUT);

	kfree(dmabuf);

	if (result == bufsize) {
		result = 0;
	} else {
		dev_err(&serial->interface->dev,
			"failed to set vendor val 0x%04x size %d: %d\n", val,
			bufsize, result);
		if (result >= 0)
			result = -EIO;
	}

	return result;
}
#endif

782 783 784 785 786 787 788 789 790
/*
 * Detect CP2108 GET_LINE_CTL bug and activate workaround.
 * Write a known good value 0x800, read it back.
 * If it comes back swapped the bug is detected.
 * Preserve the original register value.
 */
static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
{
	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
791 792
	u16 line_ctl_save;
	u16 line_ctl_test;
793 794
	int err;

795
	err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
796 797 798
	if (err)
		return err;

799
	err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
800 801 802
	if (err)
		return err;

803
	err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
804 805 806 807 808
	if (err)
		return err;

	if (line_ctl_test == 8) {
		port_priv->has_swapped_line_ctl = true;
809
		line_ctl_save = swab16(line_ctl_save);
810 811
	}

812
	return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
813 814 815
}

/*
816
 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
817 818
 * to workaround cp2108 bug and get correct value.
 */
819
static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
820 821 822 823
{
	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
	int err;

824
	err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
825 826 827 828 829
	if (err)
		return err;

	/* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
	if (port_priv->has_swapped_line_ctl)
830
		*ctl = swab16(*ctl);
831 832 833 834

	return 0;
}

835
static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
L
Linus Torvalds 已提交
836
{
837
	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
L
Linus Torvalds 已提交
838 839
	int result;

840
	result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
841 842 843
	if (result) {
		dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
		return result;
L
Linus Torvalds 已提交
844 845
	}

846
	/* Configure the termios structure */
847
	cp210x_get_termios(tty, port);
848

849 850
	if (tty) {
		/* The baud rate must be initialised on cp2104 */
851 852
		cp210x_change_speed(tty, port, NULL);

853 854 855 856
		if (I_INPCK(tty))
			cp210x_enable_event_mode(port);
	}

857 858 859 860 861 862 863 864
	result = usb_serial_generic_open(tty, port);
	if (result)
		goto err_disable;

	return 0;

err_disable:
	cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
865
	port_priv->event_mode = false;
866 867

	return result;
L
Linus Torvalds 已提交
868 869
}

870
static void cp210x_close(struct usb_serial_port *port)
L
Linus Torvalds 已提交
871
{
872 873
	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);

874
	usb_serial_generic_close(port);
875 876

	/* Clear both queues; cp2108 needs this to avoid an occasional hang */
877
	cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
878

879
	cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986

	/* Disabling the interface disables event-insertion mode. */
	port_priv->event_mode = false;
}

static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag)
{
	if (lsr & CP210X_LSR_BREAK) {
		port->icount.brk++;
		*flag = TTY_BREAK;
	} else if (lsr & CP210X_LSR_PARITY) {
		port->icount.parity++;
		*flag = TTY_PARITY;
	} else if (lsr & CP210X_LSR_FRAME) {
		port->icount.frame++;
		*flag = TTY_FRAME;
	}

	if (lsr & CP210X_LSR_OVERRUN) {
		port->icount.overrun++;
		tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
	}
}

static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag)
{
	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);

	switch (port_priv->event_state) {
	case ES_DATA:
		if (*ch == CP210X_ESCCHAR) {
			port_priv->event_state = ES_ESCAPE;
			break;
		}
		return false;
	case ES_ESCAPE:
		switch (*ch) {
		case 0:
			dev_dbg(&port->dev, "%s - escape char\n", __func__);
			*ch = CP210X_ESCCHAR;
			port_priv->event_state = ES_DATA;
			return false;
		case 1:
			port_priv->event_state = ES_LSR_DATA_0;
			break;
		case 2:
			port_priv->event_state = ES_LSR;
			break;
		case 3:
			port_priv->event_state = ES_MSR;
			break;
		default:
			dev_err(&port->dev, "malformed event 0x%02x\n", *ch);
			port_priv->event_state = ES_DATA;
			break;
		}
		break;
	case ES_LSR_DATA_0:
		port_priv->lsr = *ch;
		port_priv->event_state = ES_LSR_DATA_1;
		break;
	case ES_LSR_DATA_1:
		dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n",
				__func__, port_priv->lsr, *ch);
		cp210x_process_lsr(port, port_priv->lsr, flag);
		port_priv->event_state = ES_DATA;
		return false;
	case ES_LSR:
		dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch);
		port_priv->lsr = *ch;
		cp210x_process_lsr(port, port_priv->lsr, flag);
		port_priv->event_state = ES_DATA;
		break;
	case ES_MSR:
		dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch);
		/* unimplemented */
		port_priv->event_state = ES_DATA;
		break;
	}

	return true;
}

static void cp210x_process_read_urb(struct urb *urb)
{
	struct usb_serial_port *port = urb->context;
	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
	unsigned char *ch = urb->transfer_buffer;
	char flag;
	int i;

	if (!urb->actual_length)
		return;

	if (port_priv->event_mode) {
		for (i = 0; i < urb->actual_length; i++, ch++) {
			flag = TTY_NORMAL;

			if (cp210x_process_char(port, ch, &flag))
				continue;

			tty_insert_flip_char(&port->port, *ch, flag);
		}
	} else {
		tty_insert_flip_string(&port->port, ch, urb->actual_length);
	}
	tty_flip_buffer_push(&port->port);
L
Linus Torvalds 已提交
987 988
}

K
Konstantin Shkolnyy 已提交
989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013
/*
 * Read how many bytes are waiting in the TX queue.
 */
static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
		u32 *count)
{
	struct usb_serial *serial = port->serial;
	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
	struct cp210x_comm_status *sts;
	int result;

	sts = kmalloc(sizeof(*sts), GFP_KERNEL);
	if (!sts)
		return -ENOMEM;

	result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
			CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
			0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
			USB_CTRL_GET_TIMEOUT);
	if (result == sizeof(*sts)) {
		*count = le32_to_cpu(sts->ulAmountInOutQueue);
		result = 0;
	} else {
		dev_err(&port->dev, "failed to get comm status: %d\n", result);
		if (result >= 0)
1014
			result = -EIO;
K
Konstantin Shkolnyy 已提交
1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033
	}

	kfree(sts);

	return result;
}

static bool cp210x_tx_empty(struct usb_serial_port *port)
{
	int err;
	u32 count;

	err = cp210x_get_tx_queue_byte_count(port, &count);
	if (err)
		return true;

	return !count;
}

1034
/*
1035
 * cp210x_get_termios
1036 1037 1038 1039
 * Reads the baud rate, data bits, parity, stop bits and flow control mode
 * from the device, corrects any unsupported values, and configures the
 * termios structure to reflect the state of the device
 */
1040
static void cp210x_get_termios(struct tty_struct *tty,
1041 1042 1043 1044 1045
	struct usb_serial_port *port)
{
	unsigned int baud;

	if (tty) {
1046
		cp210x_get_termios_port(tty->driver_data,
1047
			&tty->termios.c_cflag, &baud);
1048
		tty_encode_baud_rate(tty, baud, baud);
J
Johan Hovold 已提交
1049
	} else {
1050
		tcflag_t cflag;
1051
		cflag = 0;
1052
		cp210x_get_termios_port(port, &cflag, &baud);
1053 1054 1055 1056
	}
}

/*
1057 1058
 * cp210x_get_termios_port
 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
1059
 */
1060
static void cp210x_get_termios_port(struct usb_serial_port *port,
1061
	tcflag_t *cflagp, unsigned int *baudp)
L
Linus Torvalds 已提交
1062
{
1063
	struct device *dev = &port->dev;
1064
	tcflag_t cflag;
1065
	struct cp210x_flow_ctl flow_ctl;
1066
	u32 baud;
1067
	u16 bits;
1068
	u32 ctl_hs;
1069
	u32 flow_repl;
L
Linus Torvalds 已提交
1070

1071
	cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
L
Linus Torvalds 已提交
1072

1073
	dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
1074
	*baudp = baud;
A
Alan Cox 已提交
1075

1076
	cflag = *cflagp;
L
Linus Torvalds 已提交
1077

1078
	cp210x_get_line_ctl(port, &bits);
L
Linus Torvalds 已提交
1079
	cflag &= ~CSIZE;
A
Alan Cox 已提交
1080 1081
	switch (bits & BITS_DATA_MASK) {
	case BITS_DATA_5:
1082
		dev_dbg(dev, "%s - data bits = 5\n", __func__);
A
Alan Cox 已提交
1083 1084 1085
		cflag |= CS5;
		break;
	case BITS_DATA_6:
1086
		dev_dbg(dev, "%s - data bits = 6\n", __func__);
A
Alan Cox 已提交
1087 1088 1089
		cflag |= CS6;
		break;
	case BITS_DATA_7:
1090
		dev_dbg(dev, "%s - data bits = 7\n", __func__);
A
Alan Cox 已提交
1091 1092 1093
		cflag |= CS7;
		break;
	case BITS_DATA_8:
1094
		dev_dbg(dev, "%s - data bits = 8\n", __func__);
A
Alan Cox 已提交
1095 1096 1097
		cflag |= CS8;
		break;
	case BITS_DATA_9:
1098
		dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
A
Alan Cox 已提交
1099 1100 1101
		cflag |= CS8;
		bits &= ~BITS_DATA_MASK;
		bits |= BITS_DATA_8;
1102
		cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
A
Alan Cox 已提交
1103 1104
		break;
	default:
1105
		dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
A
Alan Cox 已提交
1106 1107 1108
		cflag |= CS8;
		bits &= ~BITS_DATA_MASK;
		bits |= BITS_DATA_8;
1109
		cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
A
Alan Cox 已提交
1110
		break;
L
Linus Torvalds 已提交
1111 1112
	}

A
Alan Cox 已提交
1113 1114
	switch (bits & BITS_PARITY_MASK) {
	case BITS_PARITY_NONE:
1115
		dev_dbg(dev, "%s - parity = NONE\n", __func__);
A
Alan Cox 已提交
1116 1117 1118
		cflag &= ~PARENB;
		break;
	case BITS_PARITY_ODD:
1119
		dev_dbg(dev, "%s - parity = ODD\n", __func__);
A
Alan Cox 已提交
1120 1121 1122
		cflag |= (PARENB|PARODD);
		break;
	case BITS_PARITY_EVEN:
1123
		dev_dbg(dev, "%s - parity = EVEN\n", __func__);
A
Alan Cox 已提交
1124 1125 1126 1127
		cflag &= ~PARODD;
		cflag |= PARENB;
		break;
	case BITS_PARITY_MARK:
1128
		dev_dbg(dev, "%s - parity = MARK\n", __func__);
1129
		cflag |= (PARENB|PARODD|CMSPAR);
A
Alan Cox 已提交
1130 1131
		break;
	case BITS_PARITY_SPACE:
1132
		dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1133 1134
		cflag &= ~PARODD;
		cflag |= (PARENB|CMSPAR);
A
Alan Cox 已提交
1135 1136
		break;
	default:
1137
		dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
A
Alan Cox 已提交
1138 1139
		cflag &= ~PARENB;
		bits &= ~BITS_PARITY_MASK;
1140
		cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
A
Alan Cox 已提交
1141
		break;
L
Linus Torvalds 已提交
1142 1143 1144
	}

	cflag &= ~CSTOPB;
A
Alan Cox 已提交
1145 1146
	switch (bits & BITS_STOP_MASK) {
	case BITS_STOP_1:
1147
		dev_dbg(dev, "%s - stop bits = 1\n", __func__);
A
Alan Cox 已提交
1148 1149
		break;
	case BITS_STOP_1_5:
1150
		dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
A
Alan Cox 已提交
1151
		bits &= ~BITS_STOP_MASK;
1152
		cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
A
Alan Cox 已提交
1153 1154
		break;
	case BITS_STOP_2:
1155
		dev_dbg(dev, "%s - stop bits = 2\n", __func__);
A
Alan Cox 已提交
1156 1157 1158
		cflag |= CSTOPB;
		break;
	default:
1159
		dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
A
Alan Cox 已提交
1160
		bits &= ~BITS_STOP_MASK;
1161
		cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
A
Alan Cox 已提交
1162
		break;
L
Linus Torvalds 已提交
1163 1164
	}

1165 1166 1167 1168
	cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
			sizeof(flow_ctl));
	ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
	if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
1169
		dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185
		/*
		 * When the port is closed, the CP210x hardware disables
		 * auto-RTS and RTS is deasserted but it leaves auto-CTS when
		 * in hardware flow control mode. When re-opening the port, if
		 * auto-CTS is enabled on the cp210x, then auto-RTS must be
		 * re-enabled in the driver.
		 */
		flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
		flow_repl &= ~CP210X_SERIAL_RTS_MASK;
		flow_repl |= CP210X_SERIAL_RTS_SHIFT(CP210X_SERIAL_RTS_FLOW_CTL);
		flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
		cp210x_write_reg_block(port,
				CP210X_SET_FLOW,
				&flow_ctl,
				sizeof(flow_ctl));

1186 1187
		cflag |= CRTSCTS;
	} else {
1188
		dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1189 1190 1191
		cflag &= ~CRTSCTS;
	}

1192
	*cflagp = cflag;
L
Linus Torvalds 已提交
1193 1194
}

1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246
struct cp210x_rate {
	speed_t rate;
	speed_t high;
};

static const struct cp210x_rate cp210x_an205_table1[] = {
	{ 300, 300 },
	{ 600, 600 },
	{ 1200, 1200 },
	{ 1800, 1800 },
	{ 2400, 2400 },
	{ 4000, 4000 },
	{ 4800, 4803 },
	{ 7200, 7207 },
	{ 9600, 9612 },
	{ 14400, 14428 },
	{ 16000, 16062 },
	{ 19200, 19250 },
	{ 28800, 28912 },
	{ 38400, 38601 },
	{ 51200, 51558 },
	{ 56000, 56280 },
	{ 57600, 58053 },
	{ 64000, 64111 },
	{ 76800, 77608 },
	{ 115200, 117028 },
	{ 128000, 129347 },
	{ 153600, 156868 },
	{ 230400, 237832 },
	{ 250000, 254234 },
	{ 256000, 273066 },
	{ 460800, 491520 },
	{ 500000, 567138 },
	{ 576000, 670254 },
	{ 921600, UINT_MAX }
};

/*
 * Quantises the baud rate as per AN205 Table 1
 */
static speed_t cp210x_get_an205_rate(speed_t baud)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) {
		if (baud <= cp210x_an205_table1[i].high)
			break;
	}

	return cp210x_an205_table1[i].rate;
}

1247
static speed_t cp210x_get_actual_rate(speed_t baud)
1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260
{
	unsigned int prescale = 1;
	unsigned int div;

	if (baud <= 365)
		prescale = 4;

	div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud);
	baud = 48000000 / (2 * prescale * div);

	return baud;
}

1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289
/*
 * CP2101 supports the following baud rates:
 *
 *	300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
 *	38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
 *
 * CP2102 and CP2103 support the following additional rates:
 *
 *	4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
 *	576000
 *
 * The device will map a requested rate to a supported one, but the result
 * of requests for rates greater than 1053257 is undefined (see AN205).
 *
 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
 * respectively, with an error less than 1%. The actual rates are determined
 * by
 *
 *	div = round(freq / (2 x prescale x request))
 *	actual = freq / (2 x prescale x div)
 *
 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
 * or 1 otherwise.
 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
 * otherwise.
 */
static void cp210x_change_speed(struct tty_struct *tty,
		struct usb_serial_port *port, struct ktermios *old_termios)
{
1290 1291
	struct usb_serial *serial = port->serial;
	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1292 1293
	u32 baud;

1294
	/*
1295 1296
	 * This maps the requested rate to the actual rate, a valid rate on
	 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed].
1297 1298 1299
	 *
	 * NOTE: B0 is not implemented.
	 */
1300 1301
	baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed);

1302
	if (priv->use_actual_rate)
1303
		baud = cp210x_get_actual_rate(baud);
1304
	else if (baud < 1000000)
1305
		baud = cp210x_get_an205_rate(baud);
1306

1307
	dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1308
	if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1309 1310 1311 1312 1313 1314 1315 1316 1317 1318
		dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
		if (old_termios)
			baud = old_termios->c_ospeed;
		else
			baud = 9600;
	}

	tty_encode_baud_rate(tty, baud, baud);
}

1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353
static void cp210x_enable_event_mode(struct usb_serial_port *port)
{
	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
	int ret;

	if (port_priv->event_mode)
		return;

	port_priv->event_state = ES_DATA;
	port_priv->event_mode = true;

	ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR);
	if (ret) {
		dev_err(&port->dev, "failed to enable events: %d\n", ret);
		port_priv->event_mode = false;
	}
}

static void cp210x_disable_event_mode(struct usb_serial_port *port)
{
	struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
	int ret;

	if (!port_priv->event_mode)
		return;

	ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0);
	if (ret) {
		dev_err(&port->dev, "failed to disable events: %d\n", ret);
		return;
	}

	port_priv->event_mode = false;
}

1354
static void cp210x_set_termios(struct tty_struct *tty,
A
Alan Cox 已提交
1355
		struct usb_serial_port *port, struct ktermios *old_termios)
L
Linus Torvalds 已提交
1356
{
1357
	struct device *dev = &port->dev;
A
Alan Cox 已提交
1358
	unsigned int cflag, old_cflag;
1359
	u16 bits;
L
Linus Torvalds 已提交
1360

1361
	cflag = tty->termios.c_cflag;
1362
	old_cflag = old_termios->c_cflag;
1363

1364
	if (tty->termios.c_ospeed != old_termios->c_ospeed)
1365
		cp210x_change_speed(tty, port, old_termios);
L
Linus Torvalds 已提交
1366

1367
	/* If the number of data bits is to be updated */
L
Linus Torvalds 已提交
1368
	if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
1369
		cp210x_get_line_ctl(port, &bits);
L
Linus Torvalds 已提交
1370 1371
		bits &= ~BITS_DATA_MASK;
		switch (cflag & CSIZE) {
A
Alan Cox 已提交
1372 1373
		case CS5:
			bits |= BITS_DATA_5;
1374
			dev_dbg(dev, "%s - data bits = 5\n", __func__);
A
Alan Cox 已提交
1375 1376 1377
			break;
		case CS6:
			bits |= BITS_DATA_6;
1378
			dev_dbg(dev, "%s - data bits = 6\n", __func__);
A
Alan Cox 已提交
1379 1380 1381
			break;
		case CS7:
			bits |= BITS_DATA_7;
1382
			dev_dbg(dev, "%s - data bits = 7\n", __func__);
A
Alan Cox 已提交
1383 1384 1385
			break;
		case CS8:
		default:
J
Johan Hovold 已提交
1386
			bits |= BITS_DATA_8;
1387
			dev_dbg(dev, "%s - data bits = 8\n", __func__);
J
Johan Hovold 已提交
1388
			break;
L
Linus Torvalds 已提交
1389
		}
1390
		if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1391
			dev_dbg(dev, "Number of data bits requested not supported by device\n");
L
Linus Torvalds 已提交
1392 1393
	}

1394 1395
	if ((cflag     & (PARENB|PARODD|CMSPAR)) !=
	    (old_cflag & (PARENB|PARODD|CMSPAR))) {
1396
		cp210x_get_line_ctl(port, &bits);
L
Linus Torvalds 已提交
1397 1398
		bits &= ~BITS_PARITY_MASK;
		if (cflag & PARENB) {
1399
			if (cflag & CMSPAR) {
1400 1401 1402 1403 1404 1405 1406
				if (cflag & PARODD) {
					bits |= BITS_PARITY_MARK;
					dev_dbg(dev, "%s - parity = MARK\n", __func__);
				} else {
					bits |= BITS_PARITY_SPACE;
					dev_dbg(dev, "%s - parity = SPACE\n", __func__);
				}
L
Linus Torvalds 已提交
1407
			} else {
1408 1409 1410 1411 1412 1413 1414
				if (cflag & PARODD) {
					bits |= BITS_PARITY_ODD;
					dev_dbg(dev, "%s - parity = ODD\n", __func__);
				} else {
					bits |= BITS_PARITY_EVEN;
					dev_dbg(dev, "%s - parity = EVEN\n", __func__);
				}
L
Linus Torvalds 已提交
1415 1416
			}
		}
1417
		if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1418
			dev_dbg(dev, "Parity mode not supported by device\n");
L
Linus Torvalds 已提交
1419 1420 1421
	}

	if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
1422
		cp210x_get_line_ctl(port, &bits);
L
Linus Torvalds 已提交
1423 1424 1425
		bits &= ~BITS_STOP_MASK;
		if (cflag & CSTOPB) {
			bits |= BITS_STOP_2;
1426
			dev_dbg(dev, "%s - stop bits = 2\n", __func__);
L
Linus Torvalds 已提交
1427 1428
		} else {
			bits |= BITS_STOP_1;
1429
			dev_dbg(dev, "%s - stop bits = 1\n", __func__);
L
Linus Torvalds 已提交
1430
		}
1431
		if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1432
			dev_dbg(dev, "Number of stop bits requested not supported by device\n");
L
Linus Torvalds 已提交
1433
	}
1434 1435

	if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
1436 1437 1438
		struct cp210x_flow_ctl flow_ctl;
		u32 ctl_hs;
		u32 flow_repl;
1439

1440 1441 1442 1443 1444 1445
		cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
				sizeof(flow_ctl));
		ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
		flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
		dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
				__func__, ctl_hs, flow_repl);
1446

1447 1448 1449 1450 1451
		ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
		ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
		ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
		ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
		ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1452
		if (cflag & CRTSCTS) {
1453
			ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1454 1455

			flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1456 1457
			flow_repl |= CP210X_SERIAL_RTS_SHIFT(
					CP210X_SERIAL_RTS_FLOW_CTL);
1458
			dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1459
		} else {
1460 1461 1462
			ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;

			flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1463 1464
			flow_repl |= CP210X_SERIAL_RTS_SHIFT(
					CP210X_SERIAL_RTS_ACTIVE);
1465
			dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1466 1467
		}

1468 1469 1470 1471 1472 1473
		dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
				__func__, ctl_hs, flow_repl);
		flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
		flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
		cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
				sizeof(flow_ctl));
1474 1475
	}

1476 1477 1478 1479 1480 1481 1482 1483
	/*
	 * Enable event-insertion mode only if input parity checking is
	 * enabled for now.
	 */
	if (I_INPCK(tty))
		cp210x_enable_event_mode(port);
	else
		cp210x_disable_event_mode(port);
1484 1485
}

J
Johan Hovold 已提交
1486
static int cp210x_tiocmset(struct tty_struct *tty,
1487 1488
		unsigned int set, unsigned int clear)
{
A
Alan Cox 已提交
1489
	struct usb_serial_port *port = tty->driver_data;
1490
	return cp210x_tiocmset_port(port, set, clear);
1491 1492
}

1493
static int cp210x_tiocmset_port(struct usb_serial_port *port,
1494 1495
		unsigned int set, unsigned int clear)
{
1496
	u16 control = 0;
1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514

	if (set & TIOCM_RTS) {
		control |= CONTROL_RTS;
		control |= CONTROL_WRITE_RTS;
	}
	if (set & TIOCM_DTR) {
		control |= CONTROL_DTR;
		control |= CONTROL_WRITE_DTR;
	}
	if (clear & TIOCM_RTS) {
		control &= ~CONTROL_RTS;
		control |= CONTROL_WRITE_RTS;
	}
	if (clear & TIOCM_DTR) {
		control &= ~CONTROL_DTR;
		control |= CONTROL_WRITE_DTR;
	}

1515
	dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1516

1517
	return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1518 1519
}

A
Alan Cox 已提交
1520 1521 1522
static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
{
	if (on)
1523
		cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
A
Alan Cox 已提交
1524
	else
1525
		cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
A
Alan Cox 已提交
1526 1527
}

J
Johan Hovold 已提交
1528
static int cp210x_tiocmget(struct tty_struct *tty)
1529
{
A
Alan Cox 已提交
1530
	struct usb_serial_port *port = tty->driver_data;
1531
	u8 control;
1532
	int result;
1533

1534 1535 1536
	result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
	if (result)
		return result;
1537 1538 1539 1540 1541 1542 1543 1544

	result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
		|((control & CONTROL_RTS) ? TIOCM_RTS : 0)
		|((control & CONTROL_CTS) ? TIOCM_CTS : 0)
		|((control & CONTROL_DSR) ? TIOCM_DSR : 0)
		|((control & CONTROL_RING)? TIOCM_RI  : 0)
		|((control & CONTROL_DCD) ? TIOCM_CD  : 0);

1545
	dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1546 1547

	return result;
L
Linus Torvalds 已提交
1548 1549
}

J
Johan Hovold 已提交
1550
static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
L
Linus Torvalds 已提交
1551
{
A
Alan Cox 已提交
1552
	struct usb_serial_port *port = tty->driver_data;
1553
	u16 state;
L
Linus Torvalds 已提交
1554 1555 1556 1557 1558

	if (break_state == 0)
		state = BREAK_OFF;
	else
		state = BREAK_ON;
1559 1560
	dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
		state == BREAK_OFF ? "off" : "on");
1561
	cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
L
Linus Torvalds 已提交
1562 1563
}

1564 1565 1566 1567 1568 1569
#ifdef CONFIG_GPIOLIB
static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset)
{
	struct usb_serial *serial = gpiochip_get_data(gc);
	struct cp210x_serial_private *priv = usb_get_serial_data(serial);

1570 1571
	if (priv->gpio_altfunc & BIT(offset))
		return -ENODEV;
1572 1573 1574 1575 1576 1577 1578

	return 0;
}

static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
{
	struct usb_serial *serial = gpiochip_get_data(gc);
1579 1580
	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
	u8 req_type = REQTYPE_DEVICE_TO_HOST;
1581 1582 1583
	int result;
	u8 buf;

1584 1585 1586
	if (priv->partnum == CP210X_PARTNUM_CP2105)
		req_type = REQTYPE_INTERFACE_TO_HOST;

1587 1588 1589 1590
	result = usb_autopm_get_interface(serial->interface);
	if (result)
		return result;

1591
	result = cp210x_read_vendor_block(serial, req_type,
1592
					  CP210X_READ_LATCH, &buf, sizeof(buf));
1593
	usb_autopm_put_interface(serial->interface);
1594 1595 1596 1597 1598 1599 1600 1601 1602
	if (result < 0)
		return result;

	return !!(buf & BIT(gpio));
}

static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
{
	struct usb_serial *serial = gpiochip_get_data(gc);
1603
	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1604
	struct cp210x_gpio_write buf;
1605
	int result;
1606 1607 1608 1609 1610 1611 1612 1613

	if (value == 1)
		buf.state = BIT(gpio);
	else
		buf.state = 0;

	buf.mask = BIT(gpio);

1614 1615 1616 1617
	result = usb_autopm_get_interface(serial->interface);
	if (result)
		goto out;

1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634
	if (priv->partnum == CP210X_PARTNUM_CP2105) {
		result = cp210x_write_vendor_block(serial,
						   REQTYPE_HOST_TO_INTERFACE,
						   CP210X_WRITE_LATCH, &buf,
						   sizeof(buf));
	} else {
		u16 wIndex = buf.state << 8 | buf.mask;

		result = usb_control_msg(serial->dev,
					 usb_sndctrlpipe(serial->dev, 0),
					 CP210X_VENDOR_SPECIFIC,
					 REQTYPE_HOST_TO_DEVICE,
					 CP210X_WRITE_LATCH,
					 wIndex,
					 NULL, 0, USB_CTRL_SET_TIMEOUT);
	}

1635 1636
	usb_autopm_put_interface(serial->interface);
out:
1637 1638 1639 1640
	if (result < 0) {
		dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n",
				result);
	}
1641 1642 1643 1644
}

static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
{
1645 1646 1647 1648
	struct usb_serial *serial = gpiochip_get_data(gc);
	struct cp210x_serial_private *priv = usb_get_serial_data(serial);

	return priv->gpio_input & BIT(gpio);
1649 1650 1651 1652
}

static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
{
1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670
	struct usb_serial *serial = gpiochip_get_data(gc);
	struct cp210x_serial_private *priv = usb_get_serial_data(serial);

	if (priv->partnum == CP210X_PARTNUM_CP2105) {
		/* hardware does not support an input mode */
		return -ENOTSUPP;
	}

	/* push-pull pins cannot be changed to be inputs */
	if (priv->gpio_pushpull & BIT(gpio))
		return -EINVAL;

	/* make sure to release pin if it is being driven low */
	cp210x_gpio_set(gc, gpio, 1);

	priv->gpio_input |= BIT(gpio);

	return 0;
1671 1672 1673 1674 1675
}

static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
					int value)
{
1676 1677 1678 1679 1680 1681
	struct usb_serial *serial = gpiochip_get_data(gc);
	struct cp210x_serial_private *priv = usb_get_serial_data(serial);

	priv->gpio_input &= ~BIT(gpio);
	cp210x_gpio_set(gc, gpio, value);

1682 1683 1684
	return 0;
}

1685 1686
static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
				  unsigned long config)
1687 1688 1689
{
	struct usb_serial *serial = gpiochip_get_data(gc);
	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1690
	enum pin_config_param param = pinconf_to_config_param(config);
1691 1692

	/* Succeed only if in correct mode (this can't be set at runtime) */
1693
	if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1694
	    (priv->gpio_pushpull & BIT(gpio)))
1695 1696
		return 0;

1697
	if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1698
	    !(priv->gpio_pushpull & BIT(gpio)))
1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710
		return 0;

	return -ENOTSUPP;
}

/*
 * This function is for configuring GPIO using shared pins, where other signals
 * are made unavailable by configuring the use of GPIO. This is believed to be
 * only applicable to the cp2105 at this point, the other devices supported by
 * this driver that provide GPIO do so in a way that does not impact other
 * signals and are thus expected to have very different initialisation.
 */
1711
static int cp2105_gpioconf_init(struct usb_serial *serial)
1712 1713 1714
{
	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
	struct cp210x_pin_mode mode;
1715
	struct cp210x_dual_port_config config;
1716
	u8 intf_num = cp210x_interface_num(serial);
1717
	u8 iface_config;
1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733
	int result;

	result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
					  CP210X_GET_DEVICEMODE, &mode,
					  sizeof(mode));
	if (result < 0)
		return result;

	result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
					  CP210X_GET_PORTCONFIG, &config,
					  sizeof(config));
	if (result < 0)
		return result;

	/*  2 banks of GPIO - One for the pins taken from each serial port */
	if (intf_num == 0) {
1734 1735 1736
		if (mode.eci == CP210X_PIN_MODE_MODEM) {
			/* mark all GPIOs of this interface as reserved */
			priv->gpio_altfunc = 0xff;
1737
			return 0;
1738
		}
1739

1740 1741
		iface_config = config.eci_cfg;
		priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1742 1743 1744 1745
						CP210X_ECI_GPIO_MODE_MASK) >>
						CP210X_ECI_GPIO_MODE_OFFSET);
		priv->gc.ngpio = 2;
	} else if (intf_num == 1) {
1746 1747 1748
		if (mode.sci == CP210X_PIN_MODE_MODEM) {
			/* mark all GPIOs of this interface as reserved */
			priv->gpio_altfunc = 0xff;
1749
			return 0;
1750
		}
1751

1752 1753
		iface_config = config.sci_cfg;
		priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1754 1755 1756 1757 1758 1759 1760
						CP210X_SCI_GPIO_MODE_MASK) >>
						CP210X_SCI_GPIO_MODE_OFFSET);
		priv->gc.ngpio = 3;
	} else {
		return -ENODEV;
	}

1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773
	/* mark all pins which are not in GPIO mode */
	if (iface_config & CP2105_GPIO0_TXLED_MODE)	/* GPIO 0 */
		priv->gpio_altfunc |= BIT(0);
	if (iface_config & (CP2105_GPIO1_RXLED_MODE |	/* GPIO 1 */
			CP2105_GPIO1_RS485_MODE))
		priv->gpio_altfunc |= BIT(1);

	/* driver implementation for CP2105 only supports outputs */
	priv->gpio_input = 0;

	return 0;
}

1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823
static int cp2104_gpioconf_init(struct usb_serial *serial)
{
	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
	struct cp210x_single_port_config config;
	u8 iface_config;
	u8 gpio_latch;
	int result;
	u8 i;

	result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
					  CP210X_GET_PORTCONFIG, &config,
					  sizeof(config));
	if (result < 0)
		return result;

	priv->gc.ngpio = 4;

	iface_config = config.device_cfg;
	priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
					CP210X_GPIO_MODE_MASK) >>
					CP210X_GPIO_MODE_OFFSET);
	gpio_latch = (u8)((le16_to_cpu(config.reset_state) &
					CP210X_GPIO_MODE_MASK) >>
					CP210X_GPIO_MODE_OFFSET);

	/* mark all pins which are not in GPIO mode */
	if (iface_config & CP2104_GPIO0_TXLED_MODE)	/* GPIO 0 */
		priv->gpio_altfunc |= BIT(0);
	if (iface_config & CP2104_GPIO1_RXLED_MODE)	/* GPIO 1 */
		priv->gpio_altfunc |= BIT(1);
	if (iface_config & CP2104_GPIO2_RS485_MODE)	/* GPIO 2 */
		priv->gpio_altfunc |= BIT(2);

	/*
	 * Like CP2102N, CP2104 has also no strict input and output pin
	 * modes.
	 * Do the same input mode emulation as CP2102N.
	 */
	for (i = 0; i < priv->gc.ngpio; ++i) {
		/*
		 * Set direction to "input" iff pin is open-drain and reset
		 * value is 1.
		 */
		if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
			priv->gpio_input |= BIT(i);
	}

	return 0;
}

1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882
static int cp2102n_gpioconf_init(struct usb_serial *serial)
{
	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
	const u16 config_size = 0x02a6;
	u8 gpio_rst_latch;
	u8 config_version;
	u8 gpio_pushpull;
	u8 *config_buf;
	u8 gpio_latch;
	u8 gpio_ctrl;
	int result;
	u8 i;

	/*
	 * Retrieve device configuration from the device.
	 * The array received contains all customization settings done at the
	 * factory/manufacturer. Format of the array is documented at the
	 * time of writing at:
	 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa
	 */
	config_buf = kmalloc(config_size, GFP_KERNEL);
	if (!config_buf)
		return -ENOMEM;

	result = cp210x_read_vendor_block(serial,
					  REQTYPE_DEVICE_TO_HOST,
					  CP210X_READ_2NCONFIG,
					  config_buf,
					  config_size);
	if (result < 0) {
		kfree(config_buf);
		return result;
	}

	config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX];
	gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX];
	gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX];
	gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX];

	kfree(config_buf);

	/* Make sure this is a config format we understand. */
	if (config_version != 0x01)
		return -ENOTSUPP;

	priv->gc.ngpio = 4;

	/*
	 * Get default pin states after reset. Needed so we can determine
	 * the direction of an open-drain pin.
	 */
	gpio_latch = (gpio_rst_latch >> 3) & 0x0f;

	/* 0 indicates open-drain mode, 1 is push-pull */
	priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f;

	/* 0 indicates GPIO mode, 1 is alternate function */
	priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f;

1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895
	if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) {
		/*
		 * For the QFN28 package, GPIO4-6 are controlled by
		 * the low three bits of the mode/latch fields.
		 * Contrary to the document linked above, the bits for
		 * the SUSPEND pins are elsewhere.  No alternate
		 * function is available for these pins.
		 */
		priv->gc.ngpio = 7;
		gpio_latch |= (gpio_rst_latch & 7) << 4;
		priv->gpio_pushpull |= (gpio_pushpull & 7) << 4;
	}

1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921
	/*
	 * The CP2102N does not strictly has input and output pin modes,
	 * it only knows open-drain and push-pull modes which is set at
	 * factory. An open-drain pin can function both as an
	 * input or an output. We emulate input mode for open-drain pins
	 * by making sure they are not driven low, and we do not allow
	 * push-pull pins to be set as an input.
	 */
	for (i = 0; i < priv->gc.ngpio; ++i) {
		/*
		 * Set direction to "input" iff pin is open-drain and reset
		 * value is 1.
		 */
		if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
			priv->gpio_input |= BIT(i);
	}

	return 0;
}

static int cp210x_gpio_init(struct usb_serial *serial)
{
	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
	int result;

	switch (priv->partnum) {
1922 1923 1924
	case CP210X_PARTNUM_CP2104:
		result = cp2104_gpioconf_init(serial);
		break;
1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939
	case CP210X_PARTNUM_CP2105:
		result = cp2105_gpioconf_init(serial);
		break;
	case CP210X_PARTNUM_CP2102N_QFN28:
	case CP210X_PARTNUM_CP2102N_QFN24:
	case CP210X_PARTNUM_CP2102N_QFN20:
		result = cp2102n_gpioconf_init(serial);
		break;
	default:
		return 0;
	}

	if (result < 0)
		return result;

1940 1941 1942 1943 1944 1945 1946
	priv->gc.label = "cp210x";
	priv->gc.request = cp210x_gpio_request;
	priv->gc.get_direction = cp210x_gpio_direction_get;
	priv->gc.direction_input = cp210x_gpio_direction_input;
	priv->gc.direction_output = cp210x_gpio_direction_output;
	priv->gc.get = cp210x_gpio_get;
	priv->gc.set = cp210x_gpio_set;
1947
	priv->gc.set_config = cp210x_gpio_set_config;
1948 1949 1950 1951 1952 1953 1954
	priv->gc.owner = THIS_MODULE;
	priv->gc.parent = &serial->interface->dev;
	priv->gc.base = -1;
	priv->gc.can_sleep = true;

	result = gpiochip_add_data(&priv->gc, serial);
	if (!result)
1955
		priv->gpio_registered = true;
1956 1957 1958 1959 1960 1961 1962 1963 1964 1965

	return result;
}

static void cp210x_gpio_remove(struct usb_serial *serial)
{
	struct cp210x_serial_private *priv = usb_get_serial_data(serial);

	if (priv->gpio_registered) {
		gpiochip_remove(&priv->gc);
1966
		priv->gpio_registered = false;
1967 1968 1969 1970 1971
	}
}

#else

1972
static int cp210x_gpio_init(struct usb_serial *serial)
1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983
{
	return 0;
}

static void cp210x_gpio_remove(struct usb_serial *serial)
{
	/* Nothing to do */
}

#endif

1984
static int cp210x_port_probe(struct usb_serial_port *port)
L
Linus Torvalds 已提交
1985
{
1986 1987
	struct usb_serial *serial = port->serial;
	struct cp210x_port_private *port_priv;
1988
	int ret;
1989

1990 1991
	port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
	if (!port_priv)
1992
		return -ENOMEM;
1993

1994
	port_priv->bInterfaceNumber = cp210x_interface_num(serial);
1995

1996
	usb_set_serial_port_data(port, port_priv);
1997

1998 1999 2000 2001 2002
	ret = cp210x_detect_swapped_line_ctl(port);
	if (ret) {
		kfree(port_priv);
		return ret;
	}
2003

L
Linus Torvalds 已提交
2004 2005 2006
	return 0;
}

2007
static int cp210x_port_remove(struct usb_serial_port *port)
2008
{
2009 2010 2011 2012
	struct cp210x_port_private *port_priv;

	port_priv = usb_get_serial_port_data(port);
	kfree(port_priv);
2013

2014
	return 0;
2015 2016
}

2017 2018 2019
static void cp210x_init_max_speed(struct usb_serial *serial)
{
	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2020
	bool use_actual_rate = false;
2021
	speed_t min = 300;
2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032
	speed_t max;

	switch (priv->partnum) {
	case CP210X_PARTNUM_CP2101:
		max = 921600;
		break;
	case CP210X_PARTNUM_CP2102:
	case CP210X_PARTNUM_CP2103:
		max = 1000000;
		break;
	case CP210X_PARTNUM_CP2104:
2033 2034 2035
		use_actual_rate = true;
		max = 2000000;
		break;
2036 2037 2038 2039
	case CP210X_PARTNUM_CP2108:
		max = 2000000;
		break;
	case CP210X_PARTNUM_CP2105:
2040 2041
		if (cp210x_interface_num(serial) == 0) {
			use_actual_rate = true;
2042
			max = 2000000;	/* ECI */
2043
		} else {
2044
			min = 2400;
2045
			max = 921600;	/* SCI */
2046
		}
2047
		break;
2048 2049 2050
	case CP210X_PARTNUM_CP2102N_QFN28:
	case CP210X_PARTNUM_CP2102N_QFN24:
	case CP210X_PARTNUM_CP2102N_QFN20:
2051
		use_actual_rate = true;
2052 2053
		max = 3000000;
		break;
2054 2055 2056 2057 2058
	default:
		max = 2000000;
		break;
	}

2059
	priv->min_speed = min;
2060
	priv->max_speed = max;
2061
	priv->use_actual_rate = use_actual_rate;
2062 2063
}

2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075
static int cp210x_attach(struct usb_serial *serial)
{
	int result;
	struct cp210x_serial_private *priv;

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
					  CP210X_GET_PARTNUM, &priv->partnum,
					  sizeof(priv->partnum));
2076 2077 2078 2079 2080
	if (result < 0) {
		dev_warn(&serial->interface->dev,
			 "querying part number failed\n");
		priv->partnum = CP210X_PARTNUM_UNKNOWN;
	}
2081 2082 2083

	usb_set_serial_data(serial, priv);

2084 2085
	cp210x_init_max_speed(serial);

2086 2087 2088 2089
	result = cp210x_gpio_init(serial);
	if (result < 0) {
		dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n",
				result);
2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108
	}

	return 0;
}

static void cp210x_disconnect(struct usb_serial *serial)
{
	cp210x_gpio_remove(serial);
}

static void cp210x_release(struct usb_serial *serial)
{
	struct cp210x_serial_private *priv = usb_get_serial_data(serial);

	cp210x_gpio_remove(serial);

	kfree(priv);
}

2109
module_usb_serial_driver(serial_drivers, id_table);
L
Linus Torvalds 已提交
2110 2111

MODULE_DESCRIPTION(DRIVER_DESC);
2112
MODULE_LICENSE("GPL v2");