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[mirror_ubuntu-artful-kernel.git] / drivers / usb / serial / cp210x.c
1 /*
2 * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
3 *
4 * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version
8 * 2 as published by the Free Software Foundation.
9 *
10 * Support to set flow control line levels using TIOCMGET and TIOCMSET
11 * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
12 * control thanks to Munir Nassar nassarmu@real-time.com
13 *
14 */
15
16 #include <linux/kernel.h>
17 #include <linux/errno.h>
18 #include <linux/slab.h>
19 #include <linux/tty.h>
20 #include <linux/tty_flip.h>
21 #include <linux/module.h>
22 #include <linux/moduleparam.h>
23 #include <linux/usb.h>
24 #include <linux/uaccess.h>
25 #include <linux/usb/serial.h>
26 #include <linux/gpio/driver.h>
27 #include <linux/bitops.h>
28 #include <linux/mutex.h>
29
30 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
31
32 /*
33 * Function Prototypes
34 */
35 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
36 static void cp210x_close(struct usb_serial_port *);
37 static void cp210x_get_termios(struct tty_struct *, struct usb_serial_port *);
38 static void cp210x_get_termios_port(struct usb_serial_port *port,
39 tcflag_t *cflagp, unsigned int *baudp);
40 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
41 struct ktermios *);
42 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
43 struct ktermios*);
44 static bool cp210x_tx_empty(struct usb_serial_port *port);
45 static int cp210x_tiocmget(struct tty_struct *);
46 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
47 static int cp210x_tiocmset_port(struct usb_serial_port *port,
48 unsigned int, unsigned int);
49 static void cp210x_break_ctl(struct tty_struct *, int);
50 static int cp210x_attach(struct usb_serial *);
51 static void cp210x_disconnect(struct usb_serial *);
52 static void cp210x_release(struct usb_serial *);
53 static int cp210x_port_probe(struct usb_serial_port *);
54 static int cp210x_port_remove(struct usb_serial_port *);
55 static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
56
57 static const struct usb_device_id id_table[] = {
58 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
59 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
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 */
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 */
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(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
68 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
69 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
70 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
71 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
72 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
73 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
74 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
75 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
76 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
77 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
78 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
79 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
80 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
81 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
82 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
83 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
84 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
85 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
86 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
87 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
88 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
89 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
90 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
91 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
92 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
93 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
94 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
95 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
96 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
97 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
98 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
99 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
100 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
101 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
102 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
103 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
104 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
105 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
106 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
107 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
108 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
109 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
110 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
111 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
112 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
113 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
114 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
115 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
116 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
117 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
118 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
119 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
120 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
121 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
122 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
123 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
124 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
125 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
126 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
127 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
128 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
129 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
130 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
131 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
132 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
133 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
134 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
135 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
136 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
137 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
138 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
139 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
140 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
141 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
142 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
143 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
144 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
145 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
146 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
147 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
148 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
149 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
150 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
151 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
152 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
153 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
154 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
155 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
156 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
157 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
158 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
159 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
160 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
161 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
162 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
163 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
164 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
165 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
166 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
167 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
168 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
169 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
170 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
171 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
172 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
173 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
174 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
175 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
176 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
177 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
178 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
179 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
180 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
181 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
182 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
183 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
184 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
185 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
186 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
187 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
188 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
189 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
190 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
191 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
192 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
193 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
194 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
195 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
196 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
197 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
198 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
199 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
200 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
201 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
202 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
203 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
204 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
205 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
206 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
207 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
208 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
209 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
210 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
211 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
212 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
213 { } /* Terminating Entry */
214 };
215
216 MODULE_DEVICE_TABLE(usb, id_table);
217
218 struct cp210x_serial_private {
219 #ifdef CONFIG_GPIOLIB
220 struct gpio_chip gc;
221 u8 config;
222 u8 gpio_mode;
223 bool gpio_registered;
224 #endif
225 u8 partnum;
226 };
227
228 struct cp210x_port_private {
229 __u8 bInterfaceNumber;
230 bool has_swapped_line_ctl;
231 };
232
233 static struct usb_serial_driver cp210x_device = {
234 .driver = {
235 .owner = THIS_MODULE,
236 .name = "cp210x",
237 },
238 .id_table = id_table,
239 .num_ports = 1,
240 .bulk_in_size = 256,
241 .bulk_out_size = 256,
242 .open = cp210x_open,
243 .close = cp210x_close,
244 .break_ctl = cp210x_break_ctl,
245 .set_termios = cp210x_set_termios,
246 .tx_empty = cp210x_tx_empty,
247 .tiocmget = cp210x_tiocmget,
248 .tiocmset = cp210x_tiocmset,
249 .attach = cp210x_attach,
250 .disconnect = cp210x_disconnect,
251 .release = cp210x_release,
252 .port_probe = cp210x_port_probe,
253 .port_remove = cp210x_port_remove,
254 .dtr_rts = cp210x_dtr_rts
255 };
256
257 static struct usb_serial_driver * const serial_drivers[] = {
258 &cp210x_device, NULL
259 };
260
261 /* Config request types */
262 #define REQTYPE_HOST_TO_INTERFACE 0x41
263 #define REQTYPE_INTERFACE_TO_HOST 0xc1
264 #define REQTYPE_HOST_TO_DEVICE 0x40
265 #define REQTYPE_DEVICE_TO_HOST 0xc0
266
267 /* Config request codes */
268 #define CP210X_IFC_ENABLE 0x00
269 #define CP210X_SET_BAUDDIV 0x01
270 #define CP210X_GET_BAUDDIV 0x02
271 #define CP210X_SET_LINE_CTL 0x03
272 #define CP210X_GET_LINE_CTL 0x04
273 #define CP210X_SET_BREAK 0x05
274 #define CP210X_IMM_CHAR 0x06
275 #define CP210X_SET_MHS 0x07
276 #define CP210X_GET_MDMSTS 0x08
277 #define CP210X_SET_XON 0x09
278 #define CP210X_SET_XOFF 0x0A
279 #define CP210X_SET_EVENTMASK 0x0B
280 #define CP210X_GET_EVENTMASK 0x0C
281 #define CP210X_SET_CHAR 0x0D
282 #define CP210X_GET_CHARS 0x0E
283 #define CP210X_GET_PROPS 0x0F
284 #define CP210X_GET_COMM_STATUS 0x10
285 #define CP210X_RESET 0x11
286 #define CP210X_PURGE 0x12
287 #define CP210X_SET_FLOW 0x13
288 #define CP210X_GET_FLOW 0x14
289 #define CP210X_EMBED_EVENTS 0x15
290 #define CP210X_GET_EVENTSTATE 0x16
291 #define CP210X_SET_CHARS 0x19
292 #define CP210X_GET_BAUDRATE 0x1D
293 #define CP210X_SET_BAUDRATE 0x1E
294 #define CP210X_VENDOR_SPECIFIC 0xFF
295
296 /* CP210X_IFC_ENABLE */
297 #define UART_ENABLE 0x0001
298 #define UART_DISABLE 0x0000
299
300 /* CP210X_(SET|GET)_BAUDDIV */
301 #define BAUD_RATE_GEN_FREQ 0x384000
302
303 /* CP210X_(SET|GET)_LINE_CTL */
304 #define BITS_DATA_MASK 0X0f00
305 #define BITS_DATA_5 0X0500
306 #define BITS_DATA_6 0X0600
307 #define BITS_DATA_7 0X0700
308 #define BITS_DATA_8 0X0800
309 #define BITS_DATA_9 0X0900
310
311 #define BITS_PARITY_MASK 0x00f0
312 #define BITS_PARITY_NONE 0x0000
313 #define BITS_PARITY_ODD 0x0010
314 #define BITS_PARITY_EVEN 0x0020
315 #define BITS_PARITY_MARK 0x0030
316 #define BITS_PARITY_SPACE 0x0040
317
318 #define BITS_STOP_MASK 0x000f
319 #define BITS_STOP_1 0x0000
320 #define BITS_STOP_1_5 0x0001
321 #define BITS_STOP_2 0x0002
322
323 /* CP210X_SET_BREAK */
324 #define BREAK_ON 0x0001
325 #define BREAK_OFF 0x0000
326
327 /* CP210X_(SET_MHS|GET_MDMSTS) */
328 #define CONTROL_DTR 0x0001
329 #define CONTROL_RTS 0x0002
330 #define CONTROL_CTS 0x0010
331 #define CONTROL_DSR 0x0020
332 #define CONTROL_RING 0x0040
333 #define CONTROL_DCD 0x0080
334 #define CONTROL_WRITE_DTR 0x0100
335 #define CONTROL_WRITE_RTS 0x0200
336
337 /* CP210X_VENDOR_SPECIFIC values */
338 #define CP210X_READ_LATCH 0x00C2
339 #define CP210X_GET_PARTNUM 0x370B
340 #define CP210X_GET_PORTCONFIG 0x370C
341 #define CP210X_GET_DEVICEMODE 0x3711
342 #define CP210X_WRITE_LATCH 0x37E1
343
344 /* Part number definitions */
345 #define CP210X_PARTNUM_CP2101 0x01
346 #define CP210X_PARTNUM_CP2102 0x02
347 #define CP210X_PARTNUM_CP2103 0x03
348 #define CP210X_PARTNUM_CP2104 0x04
349 #define CP210X_PARTNUM_CP2105 0x05
350 #define CP210X_PARTNUM_CP2108 0x08
351
352 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
353 struct cp210x_comm_status {
354 __le32 ulErrors;
355 __le32 ulHoldReasons;
356 __le32 ulAmountInInQueue;
357 __le32 ulAmountInOutQueue;
358 u8 bEofReceived;
359 u8 bWaitForImmediate;
360 u8 bReserved;
361 } __packed;
362
363 /*
364 * CP210X_PURGE - 16 bits passed in wValue of USB request.
365 * SiLabs app note AN571 gives a strange description of the 4 bits:
366 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
367 * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
368 */
369 #define PURGE_ALL 0x000f
370
371 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
372 struct cp210x_flow_ctl {
373 __le32 ulControlHandshake;
374 __le32 ulFlowReplace;
375 __le32 ulXonLimit;
376 __le32 ulXoffLimit;
377 } __packed;
378
379 /* cp210x_flow_ctl::ulControlHandshake */
380 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0)
381 #define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode)
382 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3)
383 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4)
384 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5)
385 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6)
386
387 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
388 #define CP210X_SERIAL_DTR_INACTIVE 0
389 #define CP210X_SERIAL_DTR_ACTIVE 1
390 #define CP210X_SERIAL_DTR_FLOW_CTL 2
391
392 /* cp210x_flow_ctl::ulFlowReplace */
393 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0)
394 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1)
395 #define CP210X_SERIAL_ERROR_CHAR BIT(2)
396 #define CP210X_SERIAL_NULL_STRIPPING BIT(3)
397 #define CP210X_SERIAL_BREAK_CHAR BIT(4)
398 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6)
399 #define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6)
400 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31)
401
402 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
403 #define CP210X_SERIAL_RTS_INACTIVE 0
404 #define CP210X_SERIAL_RTS_ACTIVE 1
405 #define CP210X_SERIAL_RTS_FLOW_CTL 2
406
407 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
408 struct cp210x_pin_mode {
409 u8 eci;
410 u8 sci;
411 } __packed;
412
413 #define CP210X_PIN_MODE_MODEM 0
414 #define CP210X_PIN_MODE_GPIO BIT(0)
415
416 /*
417 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes.
418 * Structure needs padding due to unused/unspecified bytes.
419 */
420 struct cp210x_config {
421 __le16 gpio_mode;
422 u8 __pad0[2];
423 __le16 reset_state;
424 u8 __pad1[4];
425 __le16 suspend_state;
426 u8 sci_cfg;
427 u8 eci_cfg;
428 u8 device_cfg;
429 } __packed;
430
431 /* GPIO modes */
432 #define CP210X_SCI_GPIO_MODE_OFFSET 9
433 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9)
434
435 #define CP210X_ECI_GPIO_MODE_OFFSET 2
436 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2)
437
438 /* CP2105 port configuration values */
439 #define CP2105_GPIO0_TXLED_MODE BIT(0)
440 #define CP2105_GPIO1_RXLED_MODE BIT(1)
441 #define CP2105_GPIO1_RS485_MODE BIT(2)
442
443 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
444 struct cp210x_gpio_write {
445 u8 mask;
446 u8 state;
447 } __packed;
448
449 /*
450 * Helper to get interface number when we only have struct usb_serial.
451 */
452 static u8 cp210x_interface_num(struct usb_serial *serial)
453 {
454 struct usb_host_interface *cur_altsetting;
455
456 cur_altsetting = serial->interface->cur_altsetting;
457
458 return cur_altsetting->desc.bInterfaceNumber;
459 }
460
461 /*
462 * Reads a variable-sized block of CP210X_ registers, identified by req.
463 * Returns data into buf in native USB byte order.
464 */
465 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
466 void *buf, int bufsize)
467 {
468 struct usb_serial *serial = port->serial;
469 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
470 void *dmabuf;
471 int result;
472
473 dmabuf = kmalloc(bufsize, GFP_KERNEL);
474 if (!dmabuf) {
475 /*
476 * FIXME Some callers don't bother to check for error,
477 * at least give them consistent junk until they are fixed
478 */
479 memset(buf, 0, bufsize);
480 return -ENOMEM;
481 }
482
483 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
484 req, REQTYPE_INTERFACE_TO_HOST, 0,
485 port_priv->bInterfaceNumber, dmabuf, bufsize,
486 USB_CTRL_SET_TIMEOUT);
487 if (result == bufsize) {
488 memcpy(buf, dmabuf, bufsize);
489 result = 0;
490 } else {
491 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
492 req, bufsize, result);
493 if (result >= 0)
494 result = -EIO;
495
496 /*
497 * FIXME Some callers don't bother to check for error,
498 * at least give them consistent junk until they are fixed
499 */
500 memset(buf, 0, bufsize);
501 }
502
503 kfree(dmabuf);
504
505 return result;
506 }
507
508 /*
509 * Reads any 32-bit CP210X_ register identified by req.
510 */
511 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
512 {
513 __le32 le32_val;
514 int err;
515
516 err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
517 if (err) {
518 /*
519 * FIXME Some callers don't bother to check for error,
520 * at least give them consistent junk until they are fixed
521 */
522 *val = 0;
523 return err;
524 }
525
526 *val = le32_to_cpu(le32_val);
527
528 return 0;
529 }
530
531 /*
532 * Reads any 16-bit CP210X_ register identified by req.
533 */
534 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
535 {
536 __le16 le16_val;
537 int err;
538
539 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
540 if (err)
541 return err;
542
543 *val = le16_to_cpu(le16_val);
544
545 return 0;
546 }
547
548 /*
549 * Reads any 8-bit CP210X_ register identified by req.
550 */
551 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
552 {
553 return cp210x_read_reg_block(port, req, val, sizeof(*val));
554 }
555
556 /*
557 * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
558 * Returns data into buf in native USB byte order.
559 */
560 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
561 void *buf, int bufsize)
562 {
563 void *dmabuf;
564 int result;
565
566 dmabuf = kmalloc(bufsize, GFP_KERNEL);
567 if (!dmabuf)
568 return -ENOMEM;
569
570 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
571 CP210X_VENDOR_SPECIFIC, type, val,
572 cp210x_interface_num(serial), dmabuf, bufsize,
573 USB_CTRL_GET_TIMEOUT);
574 if (result == bufsize) {
575 memcpy(buf, dmabuf, bufsize);
576 result = 0;
577 } else {
578 dev_err(&serial->interface->dev,
579 "failed to get vendor val 0x%04x size %d: %d\n", val,
580 bufsize, result);
581 if (result >= 0)
582 result = -EIO;
583 }
584
585 kfree(dmabuf);
586
587 return result;
588 }
589
590 /*
591 * Writes any 16-bit CP210X_ register (req) whose value is passed
592 * entirely in the wValue field of the USB request.
593 */
594 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
595 {
596 struct usb_serial *serial = port->serial;
597 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
598 int result;
599
600 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
601 req, REQTYPE_HOST_TO_INTERFACE, val,
602 port_priv->bInterfaceNumber, NULL, 0,
603 USB_CTRL_SET_TIMEOUT);
604 if (result < 0) {
605 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
606 req, result);
607 }
608
609 return result;
610 }
611
612 /*
613 * Writes a variable-sized block of CP210X_ registers, identified by req.
614 * Data in buf must be in native USB byte order.
615 */
616 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
617 void *buf, int bufsize)
618 {
619 struct usb_serial *serial = port->serial;
620 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
621 void *dmabuf;
622 int result;
623
624 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
625 if (!dmabuf)
626 return -ENOMEM;
627
628 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
629 req, REQTYPE_HOST_TO_INTERFACE, 0,
630 port_priv->bInterfaceNumber, dmabuf, bufsize,
631 USB_CTRL_SET_TIMEOUT);
632
633 kfree(dmabuf);
634
635 if (result == bufsize) {
636 result = 0;
637 } else {
638 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
639 req, bufsize, result);
640 if (result >= 0)
641 result = -EIO;
642 }
643
644 return result;
645 }
646
647 /*
648 * Writes any 32-bit CP210X_ register identified by req.
649 */
650 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
651 {
652 __le32 le32_val;
653
654 le32_val = cpu_to_le32(val);
655
656 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
657 }
658
659 #ifdef CONFIG_GPIOLIB
660 /*
661 * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
662 * Data in buf must be in native USB byte order.
663 */
664 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
665 u16 val, void *buf, int bufsize)
666 {
667 void *dmabuf;
668 int result;
669
670 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
671 if (!dmabuf)
672 return -ENOMEM;
673
674 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
675 CP210X_VENDOR_SPECIFIC, type, val,
676 cp210x_interface_num(serial), dmabuf, bufsize,
677 USB_CTRL_SET_TIMEOUT);
678
679 kfree(dmabuf);
680
681 if (result == bufsize) {
682 result = 0;
683 } else {
684 dev_err(&serial->interface->dev,
685 "failed to set vendor val 0x%04x size %d: %d\n", val,
686 bufsize, result);
687 if (result >= 0)
688 result = -EIO;
689 }
690
691 return result;
692 }
693 #endif
694
695 /*
696 * Detect CP2108 GET_LINE_CTL bug and activate workaround.
697 * Write a known good value 0x800, read it back.
698 * If it comes back swapped the bug is detected.
699 * Preserve the original register value.
700 */
701 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
702 {
703 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
704 u16 line_ctl_save;
705 u16 line_ctl_test;
706 int err;
707
708 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
709 if (err)
710 return err;
711
712 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
713 if (err)
714 return err;
715
716 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
717 if (err)
718 return err;
719
720 if (line_ctl_test == 8) {
721 port_priv->has_swapped_line_ctl = true;
722 line_ctl_save = swab16(line_ctl_save);
723 }
724
725 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
726 }
727
728 /*
729 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
730 * to workaround cp2108 bug and get correct value.
731 */
732 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
733 {
734 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
735 int err;
736
737 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
738 if (err)
739 return err;
740
741 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
742 if (port_priv->has_swapped_line_ctl)
743 *ctl = swab16(*ctl);
744
745 return 0;
746 }
747
748 /*
749 * cp210x_quantise_baudrate
750 * Quantises the baud rate as per AN205 Table 1
751 */
752 static unsigned int cp210x_quantise_baudrate(unsigned int baud)
753 {
754 if (baud <= 300)
755 baud = 300;
756 else if (baud <= 600) baud = 600;
757 else if (baud <= 1200) baud = 1200;
758 else if (baud <= 1800) baud = 1800;
759 else if (baud <= 2400) baud = 2400;
760 else if (baud <= 4000) baud = 4000;
761 else if (baud <= 4803) baud = 4800;
762 else if (baud <= 7207) baud = 7200;
763 else if (baud <= 9612) baud = 9600;
764 else if (baud <= 14428) baud = 14400;
765 else if (baud <= 16062) baud = 16000;
766 else if (baud <= 19250) baud = 19200;
767 else if (baud <= 28912) baud = 28800;
768 else if (baud <= 38601) baud = 38400;
769 else if (baud <= 51558) baud = 51200;
770 else if (baud <= 56280) baud = 56000;
771 else if (baud <= 58053) baud = 57600;
772 else if (baud <= 64111) baud = 64000;
773 else if (baud <= 77608) baud = 76800;
774 else if (baud <= 117028) baud = 115200;
775 else if (baud <= 129347) baud = 128000;
776 else if (baud <= 156868) baud = 153600;
777 else if (baud <= 237832) baud = 230400;
778 else if (baud <= 254234) baud = 250000;
779 else if (baud <= 273066) baud = 256000;
780 else if (baud <= 491520) baud = 460800;
781 else if (baud <= 567138) baud = 500000;
782 else if (baud <= 670254) baud = 576000;
783 else if (baud < 1000000)
784 baud = 921600;
785 else if (baud > 2000000)
786 baud = 2000000;
787 return baud;
788 }
789
790 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
791 {
792 int result;
793
794 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
795 if (result) {
796 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
797 return result;
798 }
799
800 /* Configure the termios structure */
801 cp210x_get_termios(tty, port);
802
803 /* The baud rate must be initialised on cp2104 */
804 if (tty)
805 cp210x_change_speed(tty, port, NULL);
806
807 return usb_serial_generic_open(tty, port);
808 }
809
810 static void cp210x_close(struct usb_serial_port *port)
811 {
812 usb_serial_generic_close(port);
813
814 /* Clear both queues; cp2108 needs this to avoid an occasional hang */
815 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
816
817 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
818 }
819
820 /*
821 * Read how many bytes are waiting in the TX queue.
822 */
823 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
824 u32 *count)
825 {
826 struct usb_serial *serial = port->serial;
827 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
828 struct cp210x_comm_status *sts;
829 int result;
830
831 sts = kmalloc(sizeof(*sts), GFP_KERNEL);
832 if (!sts)
833 return -ENOMEM;
834
835 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
836 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
837 0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
838 USB_CTRL_GET_TIMEOUT);
839 if (result == sizeof(*sts)) {
840 *count = le32_to_cpu(sts->ulAmountInOutQueue);
841 result = 0;
842 } else {
843 dev_err(&port->dev, "failed to get comm status: %d\n", result);
844 if (result >= 0)
845 result = -EIO;
846 }
847
848 kfree(sts);
849
850 return result;
851 }
852
853 static bool cp210x_tx_empty(struct usb_serial_port *port)
854 {
855 int err;
856 u32 count;
857
858 err = cp210x_get_tx_queue_byte_count(port, &count);
859 if (err)
860 return true;
861
862 return !count;
863 }
864
865 /*
866 * cp210x_get_termios
867 * Reads the baud rate, data bits, parity, stop bits and flow control mode
868 * from the device, corrects any unsupported values, and configures the
869 * termios structure to reflect the state of the device
870 */
871 static void cp210x_get_termios(struct tty_struct *tty,
872 struct usb_serial_port *port)
873 {
874 unsigned int baud;
875
876 if (tty) {
877 cp210x_get_termios_port(tty->driver_data,
878 &tty->termios.c_cflag, &baud);
879 tty_encode_baud_rate(tty, baud, baud);
880 } else {
881 tcflag_t cflag;
882 cflag = 0;
883 cp210x_get_termios_port(port, &cflag, &baud);
884 }
885 }
886
887 /*
888 * cp210x_get_termios_port
889 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
890 */
891 static void cp210x_get_termios_port(struct usb_serial_port *port,
892 tcflag_t *cflagp, unsigned int *baudp)
893 {
894 struct device *dev = &port->dev;
895 tcflag_t cflag;
896 struct cp210x_flow_ctl flow_ctl;
897 u32 baud;
898 u16 bits;
899 u32 ctl_hs;
900
901 cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
902
903 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
904 *baudp = baud;
905
906 cflag = *cflagp;
907
908 cp210x_get_line_ctl(port, &bits);
909 cflag &= ~CSIZE;
910 switch (bits & BITS_DATA_MASK) {
911 case BITS_DATA_5:
912 dev_dbg(dev, "%s - data bits = 5\n", __func__);
913 cflag |= CS5;
914 break;
915 case BITS_DATA_6:
916 dev_dbg(dev, "%s - data bits = 6\n", __func__);
917 cflag |= CS6;
918 break;
919 case BITS_DATA_7:
920 dev_dbg(dev, "%s - data bits = 7\n", __func__);
921 cflag |= CS7;
922 break;
923 case BITS_DATA_8:
924 dev_dbg(dev, "%s - data bits = 8\n", __func__);
925 cflag |= CS8;
926 break;
927 case BITS_DATA_9:
928 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
929 cflag |= CS8;
930 bits &= ~BITS_DATA_MASK;
931 bits |= BITS_DATA_8;
932 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
933 break;
934 default:
935 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
936 cflag |= CS8;
937 bits &= ~BITS_DATA_MASK;
938 bits |= BITS_DATA_8;
939 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
940 break;
941 }
942
943 switch (bits & BITS_PARITY_MASK) {
944 case BITS_PARITY_NONE:
945 dev_dbg(dev, "%s - parity = NONE\n", __func__);
946 cflag &= ~PARENB;
947 break;
948 case BITS_PARITY_ODD:
949 dev_dbg(dev, "%s - parity = ODD\n", __func__);
950 cflag |= (PARENB|PARODD);
951 break;
952 case BITS_PARITY_EVEN:
953 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
954 cflag &= ~PARODD;
955 cflag |= PARENB;
956 break;
957 case BITS_PARITY_MARK:
958 dev_dbg(dev, "%s - parity = MARK\n", __func__);
959 cflag |= (PARENB|PARODD|CMSPAR);
960 break;
961 case BITS_PARITY_SPACE:
962 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
963 cflag &= ~PARODD;
964 cflag |= (PARENB|CMSPAR);
965 break;
966 default:
967 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
968 cflag &= ~PARENB;
969 bits &= ~BITS_PARITY_MASK;
970 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
971 break;
972 }
973
974 cflag &= ~CSTOPB;
975 switch (bits & BITS_STOP_MASK) {
976 case BITS_STOP_1:
977 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
978 break;
979 case BITS_STOP_1_5:
980 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
981 bits &= ~BITS_STOP_MASK;
982 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
983 break;
984 case BITS_STOP_2:
985 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
986 cflag |= CSTOPB;
987 break;
988 default:
989 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
990 bits &= ~BITS_STOP_MASK;
991 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
992 break;
993 }
994
995 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
996 sizeof(flow_ctl));
997 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
998 if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
999 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1000 cflag |= CRTSCTS;
1001 } else {
1002 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1003 cflag &= ~CRTSCTS;
1004 }
1005
1006 *cflagp = cflag;
1007 }
1008
1009 /*
1010 * CP2101 supports the following baud rates:
1011 *
1012 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1013 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1014 *
1015 * CP2102 and CP2103 support the following additional rates:
1016 *
1017 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1018 * 576000
1019 *
1020 * The device will map a requested rate to a supported one, but the result
1021 * of requests for rates greater than 1053257 is undefined (see AN205).
1022 *
1023 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1024 * respectively, with an error less than 1%. The actual rates are determined
1025 * by
1026 *
1027 * div = round(freq / (2 x prescale x request))
1028 * actual = freq / (2 x prescale x div)
1029 *
1030 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1031 * or 1 otherwise.
1032 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1033 * otherwise.
1034 */
1035 static void cp210x_change_speed(struct tty_struct *tty,
1036 struct usb_serial_port *port, struct ktermios *old_termios)
1037 {
1038 u32 baud;
1039
1040 baud = tty->termios.c_ospeed;
1041
1042 /* This maps the requested rate to a rate valid on cp2102 or cp2103,
1043 * or to an arbitrary rate in [1M,2M].
1044 *
1045 * NOTE: B0 is not implemented.
1046 */
1047 baud = cp210x_quantise_baudrate(baud);
1048
1049 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1050 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1051 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1052 if (old_termios)
1053 baud = old_termios->c_ospeed;
1054 else
1055 baud = 9600;
1056 }
1057
1058 tty_encode_baud_rate(tty, baud, baud);
1059 }
1060
1061 static void cp210x_set_termios(struct tty_struct *tty,
1062 struct usb_serial_port *port, struct ktermios *old_termios)
1063 {
1064 struct device *dev = &port->dev;
1065 unsigned int cflag, old_cflag;
1066 u16 bits;
1067
1068 cflag = tty->termios.c_cflag;
1069 old_cflag = old_termios->c_cflag;
1070
1071 if (tty->termios.c_ospeed != old_termios->c_ospeed)
1072 cp210x_change_speed(tty, port, old_termios);
1073
1074 /* If the number of data bits is to be updated */
1075 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
1076 cp210x_get_line_ctl(port, &bits);
1077 bits &= ~BITS_DATA_MASK;
1078 switch (cflag & CSIZE) {
1079 case CS5:
1080 bits |= BITS_DATA_5;
1081 dev_dbg(dev, "%s - data bits = 5\n", __func__);
1082 break;
1083 case CS6:
1084 bits |= BITS_DATA_6;
1085 dev_dbg(dev, "%s - data bits = 6\n", __func__);
1086 break;
1087 case CS7:
1088 bits |= BITS_DATA_7;
1089 dev_dbg(dev, "%s - data bits = 7\n", __func__);
1090 break;
1091 case CS8:
1092 default:
1093 bits |= BITS_DATA_8;
1094 dev_dbg(dev, "%s - data bits = 8\n", __func__);
1095 break;
1096 }
1097 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1098 dev_dbg(dev, "Number of data bits requested not supported by device\n");
1099 }
1100
1101 if ((cflag & (PARENB|PARODD|CMSPAR)) !=
1102 (old_cflag & (PARENB|PARODD|CMSPAR))) {
1103 cp210x_get_line_ctl(port, &bits);
1104 bits &= ~BITS_PARITY_MASK;
1105 if (cflag & PARENB) {
1106 if (cflag & CMSPAR) {
1107 if (cflag & PARODD) {
1108 bits |= BITS_PARITY_MARK;
1109 dev_dbg(dev, "%s - parity = MARK\n", __func__);
1110 } else {
1111 bits |= BITS_PARITY_SPACE;
1112 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1113 }
1114 } else {
1115 if (cflag & PARODD) {
1116 bits |= BITS_PARITY_ODD;
1117 dev_dbg(dev, "%s - parity = ODD\n", __func__);
1118 } else {
1119 bits |= BITS_PARITY_EVEN;
1120 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
1121 }
1122 }
1123 }
1124 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1125 dev_dbg(dev, "Parity mode not supported by device\n");
1126 }
1127
1128 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
1129 cp210x_get_line_ctl(port, &bits);
1130 bits &= ~BITS_STOP_MASK;
1131 if (cflag & CSTOPB) {
1132 bits |= BITS_STOP_2;
1133 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1134 } else {
1135 bits |= BITS_STOP_1;
1136 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1137 }
1138 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1139 dev_dbg(dev, "Number of stop bits requested not supported by device\n");
1140 }
1141
1142 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
1143 struct cp210x_flow_ctl flow_ctl;
1144 u32 ctl_hs;
1145 u32 flow_repl;
1146
1147 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1148 sizeof(flow_ctl));
1149 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1150 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1151 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1152 __func__, ctl_hs, flow_repl);
1153
1154 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1155 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1156 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1157 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1158 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1159 if (cflag & CRTSCTS) {
1160 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1161
1162 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1163 flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1164 CP210X_SERIAL_RTS_FLOW_CTL);
1165 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1166 } else {
1167 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1168
1169 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1170 flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1171 CP210X_SERIAL_RTS_ACTIVE);
1172 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1173 }
1174
1175 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1176 __func__, ctl_hs, flow_repl);
1177 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1178 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1179 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1180 sizeof(flow_ctl));
1181 }
1182
1183 }
1184
1185 static int cp210x_tiocmset(struct tty_struct *tty,
1186 unsigned int set, unsigned int clear)
1187 {
1188 struct usb_serial_port *port = tty->driver_data;
1189 return cp210x_tiocmset_port(port, set, clear);
1190 }
1191
1192 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1193 unsigned int set, unsigned int clear)
1194 {
1195 u16 control = 0;
1196
1197 if (set & TIOCM_RTS) {
1198 control |= CONTROL_RTS;
1199 control |= CONTROL_WRITE_RTS;
1200 }
1201 if (set & TIOCM_DTR) {
1202 control |= CONTROL_DTR;
1203 control |= CONTROL_WRITE_DTR;
1204 }
1205 if (clear & TIOCM_RTS) {
1206 control &= ~CONTROL_RTS;
1207 control |= CONTROL_WRITE_RTS;
1208 }
1209 if (clear & TIOCM_DTR) {
1210 control &= ~CONTROL_DTR;
1211 control |= CONTROL_WRITE_DTR;
1212 }
1213
1214 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1215
1216 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1217 }
1218
1219 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1220 {
1221 if (on)
1222 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1223 else
1224 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1225 }
1226
1227 static int cp210x_tiocmget(struct tty_struct *tty)
1228 {
1229 struct usb_serial_port *port = tty->driver_data;
1230 u8 control;
1231 int result;
1232
1233 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1234 if (result)
1235 return result;
1236
1237 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1238 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1239 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1240 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1241 |((control & CONTROL_RING)? TIOCM_RI : 0)
1242 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
1243
1244 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1245
1246 return result;
1247 }
1248
1249 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1250 {
1251 struct usb_serial_port *port = tty->driver_data;
1252 u16 state;
1253
1254 if (break_state == 0)
1255 state = BREAK_OFF;
1256 else
1257 state = BREAK_ON;
1258 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1259 state == BREAK_OFF ? "off" : "on");
1260 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1261 }
1262
1263 #ifdef CONFIG_GPIOLIB
1264 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset)
1265 {
1266 struct usb_serial *serial = gpiochip_get_data(gc);
1267 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1268
1269 switch (offset) {
1270 case 0:
1271 if (priv->config & CP2105_GPIO0_TXLED_MODE)
1272 return -ENODEV;
1273 break;
1274 case 1:
1275 if (priv->config & (CP2105_GPIO1_RXLED_MODE |
1276 CP2105_GPIO1_RS485_MODE))
1277 return -ENODEV;
1278 break;
1279 }
1280
1281 return 0;
1282 }
1283
1284 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1285 {
1286 struct usb_serial *serial = gpiochip_get_data(gc);
1287 int result;
1288 u8 buf;
1289
1290 result = cp210x_read_vendor_block(serial, REQTYPE_INTERFACE_TO_HOST,
1291 CP210X_READ_LATCH, &buf, sizeof(buf));
1292 if (result < 0)
1293 return result;
1294
1295 return !!(buf & BIT(gpio));
1296 }
1297
1298 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1299 {
1300 struct usb_serial *serial = gpiochip_get_data(gc);
1301 struct cp210x_gpio_write buf;
1302
1303 if (value == 1)
1304 buf.state = BIT(gpio);
1305 else
1306 buf.state = 0;
1307
1308 buf.mask = BIT(gpio);
1309
1310 cp210x_write_vendor_block(serial, REQTYPE_HOST_TO_INTERFACE,
1311 CP210X_WRITE_LATCH, &buf, sizeof(buf));
1312 }
1313
1314 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1315 {
1316 /* Hardware does not support an input mode */
1317 return 0;
1318 }
1319
1320 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1321 {
1322 /* Hardware does not support an input mode */
1323 return -ENOTSUPP;
1324 }
1325
1326 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1327 int value)
1328 {
1329 return 0;
1330 }
1331
1332 static int cp210x_gpio_set_single_ended(struct gpio_chip *gc, unsigned int gpio,
1333 enum single_ended_mode mode)
1334 {
1335 struct usb_serial *serial = gpiochip_get_data(gc);
1336 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1337
1338 /* Succeed only if in correct mode (this can't be set at runtime) */
1339 if ((mode == LINE_MODE_PUSH_PULL) && (priv->gpio_mode & BIT(gpio)))
1340 return 0;
1341
1342 if ((mode == LINE_MODE_OPEN_DRAIN) && !(priv->gpio_mode & BIT(gpio)))
1343 return 0;
1344
1345 return -ENOTSUPP;
1346 }
1347
1348 /*
1349 * This function is for configuring GPIO using shared pins, where other signals
1350 * are made unavailable by configuring the use of GPIO. This is believed to be
1351 * only applicable to the cp2105 at this point, the other devices supported by
1352 * this driver that provide GPIO do so in a way that does not impact other
1353 * signals and are thus expected to have very different initialisation.
1354 */
1355 static int cp2105_shared_gpio_init(struct usb_serial *serial)
1356 {
1357 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1358 struct cp210x_pin_mode mode;
1359 struct cp210x_config config;
1360 u8 intf_num = cp210x_interface_num(serial);
1361 int result;
1362
1363 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1364 CP210X_GET_DEVICEMODE, &mode,
1365 sizeof(mode));
1366 if (result < 0)
1367 return result;
1368
1369 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1370 CP210X_GET_PORTCONFIG, &config,
1371 sizeof(config));
1372 if (result < 0)
1373 return result;
1374
1375 /* 2 banks of GPIO - One for the pins taken from each serial port */
1376 if (intf_num == 0) {
1377 if (mode.eci == CP210X_PIN_MODE_MODEM)
1378 return 0;
1379
1380 priv->config = config.eci_cfg;
1381 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
1382 CP210X_ECI_GPIO_MODE_MASK) >>
1383 CP210X_ECI_GPIO_MODE_OFFSET);
1384 priv->gc.ngpio = 2;
1385 } else if (intf_num == 1) {
1386 if (mode.sci == CP210X_PIN_MODE_MODEM)
1387 return 0;
1388
1389 priv->config = config.sci_cfg;
1390 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
1391 CP210X_SCI_GPIO_MODE_MASK) >>
1392 CP210X_SCI_GPIO_MODE_OFFSET);
1393 priv->gc.ngpio = 3;
1394 } else {
1395 return -ENODEV;
1396 }
1397
1398 priv->gc.label = "cp210x";
1399 priv->gc.request = cp210x_gpio_request;
1400 priv->gc.get_direction = cp210x_gpio_direction_get;
1401 priv->gc.direction_input = cp210x_gpio_direction_input;
1402 priv->gc.direction_output = cp210x_gpio_direction_output;
1403 priv->gc.get = cp210x_gpio_get;
1404 priv->gc.set = cp210x_gpio_set;
1405 priv->gc.set_single_ended = cp210x_gpio_set_single_ended;
1406 priv->gc.owner = THIS_MODULE;
1407 priv->gc.parent = &serial->interface->dev;
1408 priv->gc.base = -1;
1409 priv->gc.can_sleep = true;
1410
1411 result = gpiochip_add_data(&priv->gc, serial);
1412 if (!result)
1413 priv->gpio_registered = true;
1414
1415 return result;
1416 }
1417
1418 static void cp210x_gpio_remove(struct usb_serial *serial)
1419 {
1420 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1421
1422 if (priv->gpio_registered) {
1423 gpiochip_remove(&priv->gc);
1424 priv->gpio_registered = false;
1425 }
1426 }
1427
1428 #else
1429
1430 static int cp2105_shared_gpio_init(struct usb_serial *serial)
1431 {
1432 return 0;
1433 }
1434
1435 static void cp210x_gpio_remove(struct usb_serial *serial)
1436 {
1437 /* Nothing to do */
1438 }
1439
1440 #endif
1441
1442 static int cp210x_port_probe(struct usb_serial_port *port)
1443 {
1444 struct usb_serial *serial = port->serial;
1445 struct cp210x_port_private *port_priv;
1446 int ret;
1447
1448 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1449 if (!port_priv)
1450 return -ENOMEM;
1451
1452 port_priv->bInterfaceNumber = cp210x_interface_num(serial);
1453
1454 usb_set_serial_port_data(port, port_priv);
1455
1456 ret = cp210x_detect_swapped_line_ctl(port);
1457 if (ret) {
1458 kfree(port_priv);
1459 return ret;
1460 }
1461
1462 return 0;
1463 }
1464
1465 static int cp210x_port_remove(struct usb_serial_port *port)
1466 {
1467 struct cp210x_port_private *port_priv;
1468
1469 port_priv = usb_get_serial_port_data(port);
1470 kfree(port_priv);
1471
1472 return 0;
1473 }
1474
1475 static int cp210x_attach(struct usb_serial *serial)
1476 {
1477 int result;
1478 struct cp210x_serial_private *priv;
1479
1480 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1481 if (!priv)
1482 return -ENOMEM;
1483
1484 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1485 CP210X_GET_PARTNUM, &priv->partnum,
1486 sizeof(priv->partnum));
1487 if (result < 0)
1488 goto err_free_priv;
1489
1490 usb_set_serial_data(serial, priv);
1491
1492 if (priv->partnum == CP210X_PARTNUM_CP2105) {
1493 result = cp2105_shared_gpio_init(serial);
1494 if (result < 0) {
1495 dev_err(&serial->interface->dev,
1496 "GPIO initialisation failed, continuing without GPIO support\n");
1497 }
1498 }
1499
1500 return 0;
1501 err_free_priv:
1502 kfree(priv);
1503
1504 return result;
1505 }
1506
1507 static void cp210x_disconnect(struct usb_serial *serial)
1508 {
1509 cp210x_gpio_remove(serial);
1510 }
1511
1512 static void cp210x_release(struct usb_serial *serial)
1513 {
1514 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1515
1516 cp210x_gpio_remove(serial);
1517
1518 kfree(priv);
1519 }
1520
1521 module_usb_serial_driver(serial_drivers, id_table);
1522
1523 MODULE_DESCRIPTION(DRIVER_DESC);
1524 MODULE_LICENSE("GPL");
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