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spi-topcliff-pch: add recovery processing in case wait-event timeout
[zen-stable.git] / drivers / usb / serial / cp210x.c
blobb0e6465cdda381a65b584a779e06e093bd42b2e3
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
27 /*
28 * Version Information
29 */
30 #define DRIVER_VERSION "v0.09"
31 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
32
33 /*
34 * Function Prototypes
35 */
36 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
37 static void cp210x_close(struct usb_serial_port *);
38 static void cp210x_get_termios(struct tty_struct *,
39 struct usb_serial_port *port);
40 static void cp210x_get_termios_port(struct usb_serial_port *port,
41 unsigned int *cflagp, unsigned int *baudp);
42 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
43 struct ktermios *);
44 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
45 struct ktermios*);
46 static int cp210x_tiocmget(struct tty_struct *);
47 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
48 static int cp210x_tiocmset_port(struct usb_serial_port *port,
49 unsigned int, unsigned int);
50 static void cp210x_break_ctl(struct tty_struct *, int);
51 static int cp210x_startup(struct usb_serial *);
52 static void cp210x_release(struct usb_serial *);
53 static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
54
55 static bool debug;
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(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
64 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
65 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
66 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
67 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
68 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
69 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
70 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
71 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
72 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
73 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
74 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
75 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
76 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
77 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
78 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
79 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
80 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
81 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
82 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
83 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
84 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
85 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
86 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
87 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
88 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
89 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
90 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
91 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
92 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
93 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
94 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
95 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
96 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
97 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
98 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
99 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
100 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
101 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
102 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
103 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
104 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
105 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
106 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
107 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
108 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
109 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
110 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
111 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
112 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
113 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
114 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
115 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
116 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
117 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
118 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
119 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
120 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
121 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
122 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
123 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
124 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
125 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
126 { USB_DEVICE(0x10C4, 0xEA80) }, /* Silicon Labs factory default */
127 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
128 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
129 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
130 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
131 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
132 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
133 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
134 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
135 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
136 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
137 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
138 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
139 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
140 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
141 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
142 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
143 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
144 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
145 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
146 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
147 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
148 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
149 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
150 { } /* Terminating Entry */
151 };
152
153 MODULE_DEVICE_TABLE(usb, id_table);
154
155 struct cp210x_port_private {
156 __u8 bInterfaceNumber;
157 };
158
159 static struct usb_driver cp210x_driver = {
160 .name = "cp210x",
161 .probe = usb_serial_probe,
162 .disconnect = usb_serial_disconnect,
163 .id_table = id_table,
164 .no_dynamic_id = 1,
165 };
166
167 static struct usb_serial_driver cp210x_device = {
168 .driver = {
169 .owner = THIS_MODULE,
170 .name = "cp210x",
171 },
172 .usb_driver = &cp210x_driver,
173 .id_table = id_table,
174 .num_ports = 1,
175 .bulk_in_size = 256,
176 .bulk_out_size = 256,
177 .open = cp210x_open,
178 .close = cp210x_close,
179 .break_ctl = cp210x_break_ctl,
180 .set_termios = cp210x_set_termios,
181 .tiocmget = cp210x_tiocmget,
182 .tiocmset = cp210x_tiocmset,
183 .attach = cp210x_startup,
184 .release = cp210x_release,
185 .dtr_rts = cp210x_dtr_rts
186 };
187
188 /* Config request types */
189 #define REQTYPE_HOST_TO_DEVICE 0x41
190 #define REQTYPE_DEVICE_TO_HOST 0xc1
191
192 /* Config request codes */
193 #define CP210X_IFC_ENABLE 0x00
194 #define CP210X_SET_BAUDDIV 0x01
195 #define CP210X_GET_BAUDDIV 0x02
196 #define CP210X_SET_LINE_CTL 0x03
197 #define CP210X_GET_LINE_CTL 0x04
198 #define CP210X_SET_BREAK 0x05
199 #define CP210X_IMM_CHAR 0x06
200 #define CP210X_SET_MHS 0x07
201 #define CP210X_GET_MDMSTS 0x08
202 #define CP210X_SET_XON 0x09
203 #define CP210X_SET_XOFF 0x0A
204 #define CP210X_SET_EVENTMASK 0x0B
205 #define CP210X_GET_EVENTMASK 0x0C
206 #define CP210X_SET_CHAR 0x0D
207 #define CP210X_GET_CHARS 0x0E
208 #define CP210X_GET_PROPS 0x0F
209 #define CP210X_GET_COMM_STATUS 0x10
210 #define CP210X_RESET 0x11
211 #define CP210X_PURGE 0x12
212 #define CP210X_SET_FLOW 0x13
213 #define CP210X_GET_FLOW 0x14
214 #define CP210X_EMBED_EVENTS 0x15
215 #define CP210X_GET_EVENTSTATE 0x16
216 #define CP210X_SET_CHARS 0x19
217 #define CP210X_GET_BAUDRATE 0x1D
218 #define CP210X_SET_BAUDRATE 0x1E
219
220 /* CP210X_IFC_ENABLE */
221 #define UART_ENABLE 0x0001
222 #define UART_DISABLE 0x0000
223
224 /* CP210X_(SET|GET)_BAUDDIV */
225 #define BAUD_RATE_GEN_FREQ 0x384000
226
227 /* CP210X_(SET|GET)_LINE_CTL */
228 #define BITS_DATA_MASK 0X0f00
229 #define BITS_DATA_5 0X0500
230 #define BITS_DATA_6 0X0600
231 #define BITS_DATA_7 0X0700
232 #define BITS_DATA_8 0X0800
233 #define BITS_DATA_9 0X0900
234
235 #define BITS_PARITY_MASK 0x00f0
236 #define BITS_PARITY_NONE 0x0000
237 #define BITS_PARITY_ODD 0x0010
238 #define BITS_PARITY_EVEN 0x0020
239 #define BITS_PARITY_MARK 0x0030
240 #define BITS_PARITY_SPACE 0x0040
241
242 #define BITS_STOP_MASK 0x000f
243 #define BITS_STOP_1 0x0000
244 #define BITS_STOP_1_5 0x0001
245 #define BITS_STOP_2 0x0002
246
247 /* CP210X_SET_BREAK */
248 #define BREAK_ON 0x0001
249 #define BREAK_OFF 0x0000
250
251 /* CP210X_(SET_MHS|GET_MDMSTS) */
252 #define CONTROL_DTR 0x0001
253 #define CONTROL_RTS 0x0002
254 #define CONTROL_CTS 0x0010
255 #define CONTROL_DSR 0x0020
256 #define CONTROL_RING 0x0040
257 #define CONTROL_DCD 0x0080
258 #define CONTROL_WRITE_DTR 0x0100
259 #define CONTROL_WRITE_RTS 0x0200
260
261 /*
262 * cp210x_get_config
263 * Reads from the CP210x configuration registers
264 * 'size' is specified in bytes.
265 * 'data' is a pointer to a pre-allocated array of integers large
266 * enough to hold 'size' bytes (with 4 bytes to each integer)
267 */
268 static int cp210x_get_config(struct usb_serial_port *port, u8 request,
269 unsigned int *data, int size)
270 {
271 struct usb_serial *serial = port->serial;
272 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
273 __le32 *buf;
274 int result, i, length;
275
276 /* Number of integers required to contain the array */
277 length = (((size - 1) | 3) + 1)/4;
278
279 buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
280 if (!buf) {
281 dev_err(&port->dev, "%s - out of memory.\n", __func__);
282 return -ENOMEM;
283 }
284
285 /* Issue the request, attempting to read 'size' bytes */
286 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
287 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
288 port_priv->bInterfaceNumber, buf, size,
289 USB_CTRL_GET_TIMEOUT);
290
291 /* Convert data into an array of integers */
292 for (i = 0; i < length; i++)
293 data[i] = le32_to_cpu(buf[i]);
294
295 kfree(buf);
296
297 if (result != size) {
298 dbg("%s - Unable to send config request, "
299 "request=0x%x size=%d result=%d\n",
300 __func__, request, size, result);
301 if (result > 0)
302 result = -EPROTO;
303
304 return result;
305 }
306
307 return 0;
308 }
309
310 /*
311 * cp210x_set_config
312 * Writes to the CP210x configuration registers
313 * Values less than 16 bits wide are sent directly
314 * 'size' is specified in bytes.
315 */
316 static int cp210x_set_config(struct usb_serial_port *port, u8 request,
317 unsigned int *data, int size)
318 {
319 struct usb_serial *serial = port->serial;
320 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
321 __le32 *buf;
322 int result, i, length;
323
324 /* Number of integers required to contain the array */
325 length = (((size - 1) | 3) + 1)/4;
326
327 buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
328 if (!buf) {
329 dev_err(&port->dev, "%s - out of memory.\n",
330 __func__);
331 return -ENOMEM;
332 }
333
334 /* Array of integers into bytes */
335 for (i = 0; i < length; i++)
336 buf[i] = cpu_to_le32(data[i]);
337
338 if (size > 2) {
339 result = usb_control_msg(serial->dev,
340 usb_sndctrlpipe(serial->dev, 0),
341 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
342 port_priv->bInterfaceNumber, buf, size,
343 USB_CTRL_SET_TIMEOUT);
344 } else {
345 result = usb_control_msg(serial->dev,
346 usb_sndctrlpipe(serial->dev, 0),
347 request, REQTYPE_HOST_TO_DEVICE, data[0],
348 port_priv->bInterfaceNumber, NULL, 0,
349 USB_CTRL_SET_TIMEOUT);
350 }
351
352 kfree(buf);
353
354 if ((size > 2 && result != size) || result < 0) {
355 dbg("%s - Unable to send request, "
356 "request=0x%x size=%d result=%d\n",
357 __func__, request, size, result);
358 if (result > 0)
359 result = -EPROTO;
360
361 return result;
362 }
363
364 return 0;
365 }
366
367 /*
368 * cp210x_set_config_single
369 * Convenience function for calling cp210x_set_config on single data values
370 * without requiring an integer pointer
371 */
372 static inline int cp210x_set_config_single(struct usb_serial_port *port,
373 u8 request, unsigned int data)
374 {
375 return cp210x_set_config(port, request, &data, 2);
376 }
377
378 /*
379 * cp210x_quantise_baudrate
380 * Quantises the baud rate as per AN205 Table 1
381 */
382 static unsigned int cp210x_quantise_baudrate(unsigned int baud) {
383 if (baud <= 300)
384 baud = 300;
385 else if (baud <= 600) baud = 600;
386 else if (baud <= 1200) baud = 1200;
387 else if (baud <= 1800) baud = 1800;
388 else if (baud <= 2400) baud = 2400;
389 else if (baud <= 4000) baud = 4000;
390 else if (baud <= 4803) baud = 4800;
391 else if (baud <= 7207) baud = 7200;
392 else if (baud <= 9612) baud = 9600;
393 else if (baud <= 14428) baud = 14400;
394 else if (baud <= 16062) baud = 16000;
395 else if (baud <= 19250) baud = 19200;
396 else if (baud <= 28912) baud = 28800;
397 else if (baud <= 38601) baud = 38400;
398 else if (baud <= 51558) baud = 51200;
399 else if (baud <= 56280) baud = 56000;
400 else if (baud <= 58053) baud = 57600;
401 else if (baud <= 64111) baud = 64000;
402 else if (baud <= 77608) baud = 76800;
403 else if (baud <= 117028) baud = 115200;
404 else if (baud <= 129347) baud = 128000;
405 else if (baud <= 156868) baud = 153600;
406 else if (baud <= 237832) baud = 230400;
407 else if (baud <= 254234) baud = 250000;
408 else if (baud <= 273066) baud = 256000;
409 else if (baud <= 491520) baud = 460800;
410 else if (baud <= 567138) baud = 500000;
411 else if (baud <= 670254) baud = 576000;
412 else if (baud < 1000000)
413 baud = 921600;
414 else if (baud > 2000000)
415 baud = 2000000;
416 return baud;
417 }
418
419 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
420 {
421 int result;
422
423 dbg("%s - port %d", __func__, port->number);
424
425 result = cp210x_set_config_single(port, CP210X_IFC_ENABLE,
426 UART_ENABLE);
427 if (result) {
428 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
429 return result;
430 }
431
432 /* Configure the termios structure */
433 cp210x_get_termios(tty, port);
434
435 /* The baud rate must be initialised on cp2104 */
436 if (tty)
437 cp210x_change_speed(tty, port, NULL);
438
439 return usb_serial_generic_open(tty, port);
440 }
441
442 static void cp210x_close(struct usb_serial_port *port)
443 {
444 dbg("%s - port %d", __func__, port->number);
445
446 usb_serial_generic_close(port);
447
448 mutex_lock(&port->serial->disc_mutex);
449 if (!port->serial->disconnected)
450 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE);
451 mutex_unlock(&port->serial->disc_mutex);
452 }
453
454 /*
455 * cp210x_get_termios
456 * Reads the baud rate, data bits, parity, stop bits and flow control mode
457 * from the device, corrects any unsupported values, and configures the
458 * termios structure to reflect the state of the device
459 */
460 static void cp210x_get_termios(struct tty_struct *tty,
461 struct usb_serial_port *port)
462 {
463 unsigned int baud;
464
465 if (tty) {
466 cp210x_get_termios_port(tty->driver_data,
467 &tty->termios->c_cflag, &baud);
468 tty_encode_baud_rate(tty, baud, baud);
469 }
470
471 else {
472 unsigned int cflag;
473 cflag = 0;
474 cp210x_get_termios_port(port, &cflag, &baud);
475 }
476 }
477
478 /*
479 * cp210x_get_termios_port
480 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
481 */
482 static void cp210x_get_termios_port(struct usb_serial_port *port,
483 unsigned int *cflagp, unsigned int *baudp)
484 {
485 unsigned int cflag, modem_ctl[4];
486 unsigned int baud;
487 unsigned int bits;
488
489 dbg("%s - port %d", __func__, port->number);
490
491 cp210x_get_config(port, CP210X_GET_BAUDRATE, &baud, 4);
492
493 dbg("%s - baud rate = %d", __func__, baud);
494 *baudp = baud;
495
496 cflag = *cflagp;
497
498 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
499 cflag &= ~CSIZE;
500 switch (bits & BITS_DATA_MASK) {
501 case BITS_DATA_5:
502 dbg("%s - data bits = 5", __func__);
503 cflag |= CS5;
504 break;
505 case BITS_DATA_6:
506 dbg("%s - data bits = 6", __func__);
507 cflag |= CS6;
508 break;
509 case BITS_DATA_7:
510 dbg("%s - data bits = 7", __func__);
511 cflag |= CS7;
512 break;
513 case BITS_DATA_8:
514 dbg("%s - data bits = 8", __func__);
515 cflag |= CS8;
516 break;
517 case BITS_DATA_9:
518 dbg("%s - data bits = 9 (not supported, using 8 data bits)",
519 __func__);
520 cflag |= CS8;
521 bits &= ~BITS_DATA_MASK;
522 bits |= BITS_DATA_8;
523 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
524 break;
525 default:
526 dbg("%s - Unknown number of data bits, using 8", __func__);
527 cflag |= CS8;
528 bits &= ~BITS_DATA_MASK;
529 bits |= BITS_DATA_8;
530 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
531 break;
532 }
533
534 switch (bits & BITS_PARITY_MASK) {
535 case BITS_PARITY_NONE:
536 dbg("%s - parity = NONE", __func__);
537 cflag &= ~PARENB;
538 break;
539 case BITS_PARITY_ODD:
540 dbg("%s - parity = ODD", __func__);
541 cflag |= (PARENB|PARODD);
542 break;
543 case BITS_PARITY_EVEN:
544 dbg("%s - parity = EVEN", __func__);
545 cflag &= ~PARODD;
546 cflag |= PARENB;
547 break;
548 case BITS_PARITY_MARK:
549 dbg("%s - parity = MARK", __func__);
550 cflag |= (PARENB|PARODD|CMSPAR);
551 break;
552 case BITS_PARITY_SPACE:
553 dbg("%s - parity = SPACE", __func__);
554 cflag &= ~PARODD;
555 cflag |= (PARENB|CMSPAR);
556 break;
557 default:
558 dbg("%s - Unknown parity mode, disabling parity", __func__);
559 cflag &= ~PARENB;
560 bits &= ~BITS_PARITY_MASK;
561 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
562 break;
563 }
564
565 cflag &= ~CSTOPB;
566 switch (bits & BITS_STOP_MASK) {
567 case BITS_STOP_1:
568 dbg("%s - stop bits = 1", __func__);
569 break;
570 case BITS_STOP_1_5:
571 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)",
572 __func__);
573 bits &= ~BITS_STOP_MASK;
574 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
575 break;
576 case BITS_STOP_2:
577 dbg("%s - stop bits = 2", __func__);
578 cflag |= CSTOPB;
579 break;
580 default:
581 dbg("%s - Unknown number of stop bits, using 1 stop bit",
582 __func__);
583 bits &= ~BITS_STOP_MASK;
584 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
585 break;
586 }
587
588 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
589 if (modem_ctl[0] & 0x0008) {
590 dbg("%s - flow control = CRTSCTS", __func__);
591 cflag |= CRTSCTS;
592 } else {
593 dbg("%s - flow control = NONE", __func__);
594 cflag &= ~CRTSCTS;
595 }
596
597 *cflagp = cflag;
598 }
599
600 /*
601 * CP2101 supports the following baud rates:
602 *
603 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
604 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
605 *
606 * CP2102 and CP2103 support the following additional rates:
607 *
608 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
609 * 576000
610 *
611 * The device will map a requested rate to a supported one, but the result
612 * of requests for rates greater than 1053257 is undefined (see AN205).
613 *
614 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
615 * respectively, with an error less than 1%. The actual rates are determined
616 * by
617 *
618 * div = round(freq / (2 x prescale x request))
619 * actual = freq / (2 x prescale x div)
620 *
621 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
622 * or 1 otherwise.
623 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
624 * otherwise.
625 */
626 static void cp210x_change_speed(struct tty_struct *tty,
627 struct usb_serial_port *port, struct ktermios *old_termios)
628 {
629 u32 baud;
630
631 baud = tty->termios->c_ospeed;
632
633 /* This maps the requested rate to a rate valid on cp2102 or cp2103,
634 * or to an arbitrary rate in [1M,2M].
635 *
636 * NOTE: B0 is not implemented.
637 */
638 baud = cp210x_quantise_baudrate(baud);
639
640 dbg("%s - setting baud rate to %u", __func__, baud);
641 if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud,
642 sizeof(baud))) {
643 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
644 if (old_termios)
645 baud = old_termios->c_ospeed;
646 else
647 baud = 9600;
648 }
649
650 tty_encode_baud_rate(tty, baud, baud);
651 }
652
653 static void cp210x_set_termios(struct tty_struct *tty,
654 struct usb_serial_port *port, struct ktermios *old_termios)
655 {
656 unsigned int cflag, old_cflag;
657 unsigned int bits;
658 unsigned int modem_ctl[4];
659
660 dbg("%s - port %d", __func__, port->number);
661
662 if (!tty)
663 return;
664
665 cflag = tty->termios->c_cflag;
666 old_cflag = old_termios->c_cflag;
667
668 if (tty->termios->c_ospeed != old_termios->c_ospeed)
669 cp210x_change_speed(tty, port, old_termios);
670
671 /* If the number of data bits is to be updated */
672 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
673 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
674 bits &= ~BITS_DATA_MASK;
675 switch (cflag & CSIZE) {
676 case CS5:
677 bits |= BITS_DATA_5;
678 dbg("%s - data bits = 5", __func__);
679 break;
680 case CS6:
681 bits |= BITS_DATA_6;
682 dbg("%s - data bits = 6", __func__);
683 break;
684 case CS7:
685 bits |= BITS_DATA_7;
686 dbg("%s - data bits = 7", __func__);
687 break;
688 case CS8:
689 bits |= BITS_DATA_8;
690 dbg("%s - data bits = 8", __func__);
691 break;
692 /*case CS9:
693 bits |= BITS_DATA_9;
694 dbg("%s - data bits = 9", __func__);
695 break;*/
696 default:
697 dbg("cp210x driver does not "
698 "support the number of bits requested,"
699 " using 8 bit mode\n");
700 bits |= BITS_DATA_8;
701 break;
702 }
703 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
704 dbg("Number of data bits requested "
705 "not supported by device\n");
706 }
707
708 if ((cflag & (PARENB|PARODD|CMSPAR)) !=
709 (old_cflag & (PARENB|PARODD|CMSPAR))) {
710 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
711 bits &= ~BITS_PARITY_MASK;
712 if (cflag & PARENB) {
713 if (cflag & CMSPAR) {
714 if (cflag & PARODD) {
715 bits |= BITS_PARITY_MARK;
716 dbg("%s - parity = MARK", __func__);
717 } else {
718 bits |= BITS_PARITY_SPACE;
719 dbg("%s - parity = SPACE", __func__);
720 }
721 } else {
722 if (cflag & PARODD) {
723 bits |= BITS_PARITY_ODD;
724 dbg("%s - parity = ODD", __func__);
725 } else {
726 bits |= BITS_PARITY_EVEN;
727 dbg("%s - parity = EVEN", __func__);
728 }
729 }
730 }
731 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
732 dbg("Parity mode not supported "
733 "by device\n");
734 }
735
736 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
737 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
738 bits &= ~BITS_STOP_MASK;
739 if (cflag & CSTOPB) {
740 bits |= BITS_STOP_2;
741 dbg("%s - stop bits = 2", __func__);
742 } else {
743 bits |= BITS_STOP_1;
744 dbg("%s - stop bits = 1", __func__);
745 }
746 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
747 dbg("Number of stop bits requested "
748 "not supported by device\n");
749 }
750
751 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
752 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
753 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
754 __func__, modem_ctl[0], modem_ctl[1],
755 modem_ctl[2], modem_ctl[3]);
756
757 if (cflag & CRTSCTS) {
758 modem_ctl[0] &= ~0x7B;
759 modem_ctl[0] |= 0x09;
760 modem_ctl[1] = 0x80;
761 dbg("%s - flow control = CRTSCTS", __func__);
762 } else {
763 modem_ctl[0] &= ~0x7B;
764 modem_ctl[0] |= 0x01;
765 modem_ctl[1] |= 0x40;
766 dbg("%s - flow control = NONE", __func__);
767 }
768
769 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
770 __func__, modem_ctl[0], modem_ctl[1],
771 modem_ctl[2], modem_ctl[3]);
772 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16);
773 }
774
775 }
776
777 static int cp210x_tiocmset (struct tty_struct *tty,
778 unsigned int set, unsigned int clear)
779 {
780 struct usb_serial_port *port = tty->driver_data;
781 return cp210x_tiocmset_port(port, set, clear);
782 }
783
784 static int cp210x_tiocmset_port(struct usb_serial_port *port,
785 unsigned int set, unsigned int clear)
786 {
787 unsigned int control = 0;
788
789 dbg("%s - port %d", __func__, port->number);
790
791 if (set & TIOCM_RTS) {
792 control |= CONTROL_RTS;
793 control |= CONTROL_WRITE_RTS;
794 }
795 if (set & TIOCM_DTR) {
796 control |= CONTROL_DTR;
797 control |= CONTROL_WRITE_DTR;
798 }
799 if (clear & TIOCM_RTS) {
800 control &= ~CONTROL_RTS;
801 control |= CONTROL_WRITE_RTS;
802 }
803 if (clear & TIOCM_DTR) {
804 control &= ~CONTROL_DTR;
805 control |= CONTROL_WRITE_DTR;
806 }
807
808 dbg("%s - control = 0x%.4x", __func__, control);
809
810 return cp210x_set_config(port, CP210X_SET_MHS, &control, 2);
811 }
812
813 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
814 {
815 if (on)
816 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
817 else
818 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
819 }
820
821 static int cp210x_tiocmget (struct tty_struct *tty)
822 {
823 struct usb_serial_port *port = tty->driver_data;
824 unsigned int control;
825 int result;
826
827 dbg("%s - port %d", __func__, port->number);
828
829 cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1);
830
831 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
832 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
833 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
834 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
835 |((control & CONTROL_RING)? TIOCM_RI : 0)
836 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
837
838 dbg("%s - control = 0x%.2x", __func__, control);
839
840 return result;
841 }
842
843 static void cp210x_break_ctl (struct tty_struct *tty, int break_state)
844 {
845 struct usb_serial_port *port = tty->driver_data;
846 unsigned int state;
847
848 dbg("%s - port %d", __func__, port->number);
849 if (break_state == 0)
850 state = BREAK_OFF;
851 else
852 state = BREAK_ON;
853 dbg("%s - turning break %s", __func__,
854 state == BREAK_OFF ? "off" : "on");
855 cp210x_set_config(port, CP210X_SET_BREAK, &state, 2);
856 }
857
858 static int cp210x_startup(struct usb_serial *serial)
859 {
860 struct cp210x_port_private *port_priv;
861 int i;
862
863 /* cp210x buffers behave strangely unless device is reset */
864 usb_reset_device(serial->dev);
865
866 for (i = 0; i < serial->num_ports; i++) {
867 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
868 if (!port_priv)
869 return -ENOMEM;
870
871 memset(port_priv, 0x00, sizeof(*port_priv));
872 port_priv->bInterfaceNumber =
873 serial->interface->cur_altsetting->desc.bInterfaceNumber;
874
875 usb_set_serial_port_data(serial->port[i], port_priv);
876 }
877
878 return 0;
879 }
880
881 static void cp210x_release(struct usb_serial *serial)
882 {
883 struct cp210x_port_private *port_priv;
884 int i;
885
886 for (i = 0; i < serial->num_ports; i++) {
887 port_priv = usb_get_serial_port_data(serial->port[i]);
888 kfree(port_priv);
889 usb_set_serial_port_data(serial->port[i], NULL);
890 }
891 }
892
893 static int __init cp210x_init(void)
894 {
895 int retval;
896
897 retval = usb_serial_register(&cp210x_device);
898 if (retval)
899 return retval; /* Failed to register */
900
901 retval = usb_register(&cp210x_driver);
902 if (retval) {
903 /* Failed to register */
904 usb_serial_deregister(&cp210x_device);
905 return retval;
906 }
907
908 /* Success */
909 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
910 DRIVER_DESC "\n");
911 return 0;
912 }
913
914 static void __exit cp210x_exit(void)
915 {
916 usb_deregister(&cp210x_driver);
917 usb_serial_deregister(&cp210x_device);
918 }
919
920 module_init(cp210x_init);
921 module_exit(cp210x_exit);
922
923 MODULE_DESCRIPTION(DRIVER_DESC);
924 MODULE_VERSION(DRIVER_VERSION);
925 MODULE_LICENSE("GPL");
926
927 module_param(debug, bool, S_IRUGO | S_IWUSR);
928 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");