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USB: ftdi_sio: re-implement read processing
[linux-2.6/mini2440.git] / drivers / usb / serial / cp210x.c
blob4a208fe85bc9b10c7af4a27a48af8257e5224195
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_cleanup(struct usb_serial_port *);
38 static void cp210x_close(struct usb_serial_port *);
39 static void cp210x_get_termios(struct tty_struct *,
40 struct usb_serial_port *port);
41 static void cp210x_get_termios_port(struct usb_serial_port *port,
42 unsigned int *cflagp, unsigned int *baudp);
43 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
44 struct ktermios*);
45 static int cp210x_tiocmget(struct tty_struct *, struct file *);
46 static int cp210x_tiocmset(struct tty_struct *, struct file *,
47 unsigned int, unsigned int);
48 static int cp210x_tiocmset_port(struct usb_serial_port *port, struct file *,
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_disconnect(struct usb_serial *);
53
54 static int debug;
55
56 static struct usb_device_id id_table [] = {
57 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
58 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
59 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
60 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
61 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
62 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
63 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
64 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
65 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
66 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
67 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
68 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
69 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
70 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
71 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
72 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
73 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
74 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
75 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
76 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
77 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
78 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
79 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
80 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
81 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
82 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
83 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
84 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
85 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
86 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
87 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
88 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
89 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
90 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
91 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
92 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
93 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
94 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
95 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demostration module */
96 { USB_DEVICE(0x10c4, 0x8293) }, /* Telegesys ETRX2USB */
97 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
98 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
99 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
100 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
101 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
102 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
103 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
104 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
105 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
106 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
107 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
108 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
109 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
110 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
111 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
112 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
113 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
114 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
115 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
116 { } /* Terminating Entry */
117 };
118
119 MODULE_DEVICE_TABLE(usb, id_table);
120
121 static struct usb_driver cp210x_driver = {
122 .name = "cp210x",
123 .probe = usb_serial_probe,
124 .disconnect = usb_serial_disconnect,
125 .id_table = id_table,
126 .no_dynamic_id = 1,
127 };
128
129 static struct usb_serial_driver cp210x_device = {
130 .driver = {
131 .owner = THIS_MODULE,
132 .name = "cp210x",
133 },
134 .usb_driver = &cp210x_driver,
135 .id_table = id_table,
136 .num_ports = 1,
137 .open = cp210x_open,
138 .close = cp210x_close,
139 .break_ctl = cp210x_break_ctl,
140 .set_termios = cp210x_set_termios,
141 .tiocmget = cp210x_tiocmget,
142 .tiocmset = cp210x_tiocmset,
143 .attach = cp210x_startup,
144 .disconnect = cp210x_disconnect,
145 };
146
147 /* Config request types */
148 #define REQTYPE_HOST_TO_DEVICE 0x41
149 #define REQTYPE_DEVICE_TO_HOST 0xc1
150
151 /* Config request codes */
152 #define CP210X_IFC_ENABLE 0x00
153 #define CP210X_SET_BAUDDIV 0x01
154 #define CP210X_GET_BAUDDIV 0x02
155 #define CP210X_SET_LINE_CTL 0x03
156 #define CP210X_GET_LINE_CTL 0x04
157 #define CP210X_SET_BREAK 0x05
158 #define CP210X_IMM_CHAR 0x06
159 #define CP210X_SET_MHS 0x07
160 #define CP210X_GET_MDMSTS 0x08
161 #define CP210X_SET_XON 0x09
162 #define CP210X_SET_XOFF 0x0A
163 #define CP210X_SET_EVENTMASK 0x0B
164 #define CP210X_GET_EVENTMASK 0x0C
165 #define CP210X_SET_CHAR 0x0D
166 #define CP210X_GET_CHARS 0x0E
167 #define CP210X_GET_PROPS 0x0F
168 #define CP210X_GET_COMM_STATUS 0x10
169 #define CP210X_RESET 0x11
170 #define CP210X_PURGE 0x12
171 #define CP210X_SET_FLOW 0x13
172 #define CP210X_GET_FLOW 0x14
173 #define CP210X_EMBED_EVENTS 0x15
174 #define CP210X_GET_EVENTSTATE 0x16
175 #define CP210X_SET_CHARS 0x19
176
177 /* CP210X_IFC_ENABLE */
178 #define UART_ENABLE 0x0001
179 #define UART_DISABLE 0x0000
180
181 /* CP210X_(SET|GET)_BAUDDIV */
182 #define BAUD_RATE_GEN_FREQ 0x384000
183
184 /* CP210X_(SET|GET)_LINE_CTL */
185 #define BITS_DATA_MASK 0X0f00
186 #define BITS_DATA_5 0X0500
187 #define BITS_DATA_6 0X0600
188 #define BITS_DATA_7 0X0700
189 #define BITS_DATA_8 0X0800
190 #define BITS_DATA_9 0X0900
191
192 #define BITS_PARITY_MASK 0x00f0
193 #define BITS_PARITY_NONE 0x0000
194 #define BITS_PARITY_ODD 0x0010
195 #define BITS_PARITY_EVEN 0x0020
196 #define BITS_PARITY_MARK 0x0030
197 #define BITS_PARITY_SPACE 0x0040
198
199 #define BITS_STOP_MASK 0x000f
200 #define BITS_STOP_1 0x0000
201 #define BITS_STOP_1_5 0x0001
202 #define BITS_STOP_2 0x0002
203
204 /* CP210X_SET_BREAK */
205 #define BREAK_ON 0x0000
206 #define BREAK_OFF 0x0001
207
208 /* CP210X_(SET_MHS|GET_MDMSTS) */
209 #define CONTROL_DTR 0x0001
210 #define CONTROL_RTS 0x0002
211 #define CONTROL_CTS 0x0010
212 #define CONTROL_DSR 0x0020
213 #define CONTROL_RING 0x0040
214 #define CONTROL_DCD 0x0080
215 #define CONTROL_WRITE_DTR 0x0100
216 #define CONTROL_WRITE_RTS 0x0200
217
218 /*
219 * cp210x_get_config
220 * Reads from the CP210x configuration registers
221 * 'size' is specified in bytes.
222 * 'data' is a pointer to a pre-allocated array of integers large
223 * enough to hold 'size' bytes (with 4 bytes to each integer)
224 */
225 static int cp210x_get_config(struct usb_serial_port *port, u8 request,
226 unsigned int *data, int size)
227 {
228 struct usb_serial *serial = port->serial;
229 __le32 *buf;
230 int result, i, length;
231
232 /* Number of integers required to contain the array */
233 length = (((size - 1) | 3) + 1)/4;
234
235 buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
236 if (!buf) {
237 dev_err(&port->dev, "%s - out of memory.\n", __func__);
238 return -ENOMEM;
239 }
240
241 /* Issue the request, attempting to read 'size' bytes */
242 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
243 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
244 0, buf, size, 300);
245
246 /* Convert data into an array of integers */
247 for (i = 0; i < length; i++)
248 data[i] = le32_to_cpu(buf[i]);
249
250 kfree(buf);
251
252 if (result != size) {
253 dbg("%s - Unable to send config request, "
254 "request=0x%x size=%d result=%d\n",
255 __func__, request, size, result);
256 return -EPROTO;
257 }
258
259 return 0;
260 }
261
262 /*
263 * cp210x_set_config
264 * Writes to the CP210x configuration registers
265 * Values less than 16 bits wide are sent directly
266 * 'size' is specified in bytes.
267 */
268 static int cp210x_set_config(struct usb_serial_port *port, u8 request,
269 unsigned int *data, int size)
270 {
271 struct usb_serial *serial = port->serial;
272 __le32 *buf;
273 int result, i, length;
274
275 /* Number of integers required to contain the array */
276 length = (((size - 1) | 3) + 1)/4;
277
278 buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
279 if (!buf) {
280 dev_err(&port->dev, "%s - out of memory.\n",
281 __func__);
282 return -ENOMEM;
283 }
284
285 /* Array of integers into bytes */
286 for (i = 0; i < length; i++)
287 buf[i] = cpu_to_le32(data[i]);
288
289 if (size > 2) {
290 result = usb_control_msg(serial->dev,
291 usb_sndctrlpipe(serial->dev, 0),
292 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
293 0, buf, size, 300);
294 } else {
295 result = usb_control_msg(serial->dev,
296 usb_sndctrlpipe(serial->dev, 0),
297 request, REQTYPE_HOST_TO_DEVICE, data[0],
298 0, NULL, 0, 300);
299 }
300
301 kfree(buf);
302
303 if ((size > 2 && result != size) || result < 0) {
304 dbg("%s - Unable to send request, "
305 "request=0x%x size=%d result=%d\n",
306 __func__, request, size, result);
307 return -EPROTO;
308 }
309
310 /* Single data value */
311 result = usb_control_msg(serial->dev,
312 usb_sndctrlpipe(serial->dev, 0),
313 request, REQTYPE_HOST_TO_DEVICE, data[0],
314 0, NULL, 0, 300);
315 return 0;
316 }
317
318 /*
319 * cp210x_set_config_single
320 * Convenience function for calling cp210x_set_config on single data values
321 * without requiring an integer pointer
322 */
323 static inline int cp210x_set_config_single(struct usb_serial_port *port,
324 u8 request, unsigned int data)
325 {
326 return cp210x_set_config(port, request, &data, 2);
327 }
328
329 /*
330 * cp210x_quantise_baudrate
331 * Quantises the baud rate as per AN205 Table 1
332 */
333 static unsigned int cp210x_quantise_baudrate(unsigned int baud) {
334 if (baud <= 56) baud = 0;
335 else if (baud <= 300) baud = 300;
336 else if (baud <= 600) baud = 600;
337 else if (baud <= 1200) baud = 1200;
338 else if (baud <= 1800) baud = 1800;
339 else if (baud <= 2400) baud = 2400;
340 else if (baud <= 4000) baud = 4000;
341 else if (baud <= 4803) baud = 4800;
342 else if (baud <= 7207) baud = 7200;
343 else if (baud <= 9612) baud = 9600;
344 else if (baud <= 14428) baud = 14400;
345 else if (baud <= 16062) baud = 16000;
346 else if (baud <= 19250) baud = 19200;
347 else if (baud <= 28912) baud = 28800;
348 else if (baud <= 38601) baud = 38400;
349 else if (baud <= 51558) baud = 51200;
350 else if (baud <= 56280) baud = 56000;
351 else if (baud <= 58053) baud = 57600;
352 else if (baud <= 64111) baud = 64000;
353 else if (baud <= 77608) baud = 76800;
354 else if (baud <= 117028) baud = 115200;
355 else if (baud <= 129347) baud = 128000;
356 else if (baud <= 156868) baud = 153600;
357 else if (baud <= 237832) baud = 230400;
358 else if (baud <= 254234) baud = 250000;
359 else if (baud <= 273066) baud = 256000;
360 else if (baud <= 491520) baud = 460800;
361 else if (baud <= 567138) baud = 500000;
362 else if (baud <= 670254) baud = 576000;
363 else if (baud <= 1053257) baud = 921600;
364 else if (baud <= 1474560) baud = 1228800;
365 else if (baud <= 2457600) baud = 1843200;
366 else baud = 3686400;
367 return baud;
368 }
369
370 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
371 {
372 struct usb_serial *serial = port->serial;
373 int result;
374
375 dbg("%s - port %d", __func__, port->number);
376
377 if (cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_ENABLE)) {
378 dev_err(&port->dev, "%s - Unable to enable UART\n",
379 __func__);
380 return -EPROTO;
381 }
382
383 /* Start reading from the device */
384 usb_fill_bulk_urb(port->read_urb, serial->dev,
385 usb_rcvbulkpipe(serial->dev,
386 port->bulk_in_endpointAddress),
387 port->read_urb->transfer_buffer,
388 port->read_urb->transfer_buffer_length,
389 serial->type->read_bulk_callback,
390 port);
391 result = usb_submit_urb(port->read_urb, GFP_KERNEL);
392 if (result) {
393 dev_err(&port->dev, "%s - failed resubmitting read urb, "
394 "error %d\n", __func__, result);
395 return result;
396 }
397
398 /* Configure the termios structure */
399 cp210x_get_termios(tty, port);
400 return 0;
401 }
402
403 static void cp210x_cleanup(struct usb_serial_port *port)
404 {
405 struct usb_serial *serial = port->serial;
406
407 dbg("%s - port %d", __func__, port->number);
408
409 if (serial->dev) {
410 /* shutdown any bulk reads that might be going on */
411 if (serial->num_bulk_out)
412 usb_kill_urb(port->write_urb);
413 if (serial->num_bulk_in)
414 usb_kill_urb(port->read_urb);
415 }
416 }
417
418 static void cp210x_close(struct usb_serial_port *port)
419 {
420 dbg("%s - port %d", __func__, port->number);
421
422 /* shutdown our urbs */
423 dbg("%s - shutting down urbs", __func__);
424 usb_kill_urb(port->write_urb);
425 usb_kill_urb(port->read_urb);
426
427 mutex_lock(&port->serial->disc_mutex);
428 if (!port->serial->disconnected)
429 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE);
430 mutex_unlock(&port->serial->disc_mutex);
431 }
432
433 /*
434 * cp210x_get_termios
435 * Reads the baud rate, data bits, parity, stop bits and flow control mode
436 * from the device, corrects any unsupported values, and configures the
437 * termios structure to reflect the state of the device
438 */
439 static void cp210x_get_termios(struct tty_struct *tty,
440 struct usb_serial_port *port)
441 {
442 unsigned int baud;
443
444 if (tty) {
445 cp210x_get_termios_port(tty->driver_data,
446 &tty->termios->c_cflag, &baud);
447 tty_encode_baud_rate(tty, baud, baud);
448 }
449
450 else {
451 unsigned int cflag;
452 cflag = 0;
453 cp210x_get_termios_port(port, &cflag, &baud);
454 }
455 }
456
457 /*
458 * cp210x_get_termios_port
459 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
460 */
461 static void cp210x_get_termios_port(struct usb_serial_port *port,
462 unsigned int *cflagp, unsigned int *baudp)
463 {
464 unsigned int cflag, modem_ctl[4];
465 unsigned int baud;
466 unsigned int bits;
467
468 dbg("%s - port %d", __func__, port->number);
469
470 cp210x_get_config(port, CP210X_GET_BAUDDIV, &baud, 2);
471 /* Convert to baudrate */
472 if (baud)
473 baud = cp210x_quantise_baudrate((BAUD_RATE_GEN_FREQ + baud/2)/ baud);
474
475 dbg("%s - baud rate = %d", __func__, baud);
476 *baudp = baud;
477
478 cflag = *cflagp;
479
480 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
481 cflag &= ~CSIZE;
482 switch (bits & BITS_DATA_MASK) {
483 case BITS_DATA_5:
484 dbg("%s - data bits = 5", __func__);
485 cflag |= CS5;
486 break;
487 case BITS_DATA_6:
488 dbg("%s - data bits = 6", __func__);
489 cflag |= CS6;
490 break;
491 case BITS_DATA_7:
492 dbg("%s - data bits = 7", __func__);
493 cflag |= CS7;
494 break;
495 case BITS_DATA_8:
496 dbg("%s - data bits = 8", __func__);
497 cflag |= CS8;
498 break;
499 case BITS_DATA_9:
500 dbg("%s - data bits = 9 (not supported, using 8 data bits)",
501 __func__);
502 cflag |= CS8;
503 bits &= ~BITS_DATA_MASK;
504 bits |= BITS_DATA_8;
505 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
506 break;
507 default:
508 dbg("%s - Unknown number of data bits, using 8", __func__);
509 cflag |= CS8;
510 bits &= ~BITS_DATA_MASK;
511 bits |= BITS_DATA_8;
512 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
513 break;
514 }
515
516 switch (bits & BITS_PARITY_MASK) {
517 case BITS_PARITY_NONE:
518 dbg("%s - parity = NONE", __func__);
519 cflag &= ~PARENB;
520 break;
521 case BITS_PARITY_ODD:
522 dbg("%s - parity = ODD", __func__);
523 cflag |= (PARENB|PARODD);
524 break;
525 case BITS_PARITY_EVEN:
526 dbg("%s - parity = EVEN", __func__);
527 cflag &= ~PARODD;
528 cflag |= PARENB;
529 break;
530 case BITS_PARITY_MARK:
531 dbg("%s - parity = MARK (not supported, disabling parity)",
532 __func__);
533 cflag &= ~PARENB;
534 bits &= ~BITS_PARITY_MASK;
535 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
536 break;
537 case BITS_PARITY_SPACE:
538 dbg("%s - parity = SPACE (not supported, disabling parity)",
539 __func__);
540 cflag &= ~PARENB;
541 bits &= ~BITS_PARITY_MASK;
542 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
543 break;
544 default:
545 dbg("%s - Unknown parity mode, disabling parity", __func__);
546 cflag &= ~PARENB;
547 bits &= ~BITS_PARITY_MASK;
548 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
549 break;
550 }
551
552 cflag &= ~CSTOPB;
553 switch (bits & BITS_STOP_MASK) {
554 case BITS_STOP_1:
555 dbg("%s - stop bits = 1", __func__);
556 break;
557 case BITS_STOP_1_5:
558 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)",
559 __func__);
560 bits &= ~BITS_STOP_MASK;
561 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
562 break;
563 case BITS_STOP_2:
564 dbg("%s - stop bits = 2", __func__);
565 cflag |= CSTOPB;
566 break;
567 default:
568 dbg("%s - Unknown number of stop bits, using 1 stop bit",
569 __func__);
570 bits &= ~BITS_STOP_MASK;
571 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
572 break;
573 }
574
575 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
576 if (modem_ctl[0] & 0x0008) {
577 dbg("%s - flow control = CRTSCTS", __func__);
578 cflag |= CRTSCTS;
579 } else {
580 dbg("%s - flow control = NONE", __func__);
581 cflag &= ~CRTSCTS;
582 }
583
584 *cflagp = cflag;
585 }
586
587 static void cp210x_set_termios(struct tty_struct *tty,
588 struct usb_serial_port *port, struct ktermios *old_termios)
589 {
590 unsigned int cflag, old_cflag;
591 unsigned int baud = 0, bits;
592 unsigned int modem_ctl[4];
593
594 dbg("%s - port %d", __func__, port->number);
595
596 if (!tty)
597 return;
598
599 tty->termios->c_cflag &= ~CMSPAR;
600 cflag = tty->termios->c_cflag;
601 old_cflag = old_termios->c_cflag;
602 baud = cp210x_quantise_baudrate(tty_get_baud_rate(tty));
603
604 /* If the baud rate is to be updated*/
605 if (baud != tty_termios_baud_rate(old_termios) && baud != 0) {
606 dbg("%s - Setting baud rate to %d baud", __func__,
607 baud);
608 if (cp210x_set_config_single(port, CP210X_SET_BAUDDIV,
609 ((BAUD_RATE_GEN_FREQ + baud/2) / baud))) {
610 dbg("Baud rate requested not supported by device\n");
611 baud = tty_termios_baud_rate(old_termios);
612 }
613 }
614 /* Report back the resulting baud rate */
615 tty_encode_baud_rate(tty, baud, baud);
616
617 /* If the number of data bits is to be updated */
618 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
619 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
620 bits &= ~BITS_DATA_MASK;
621 switch (cflag & CSIZE) {
622 case CS5:
623 bits |= BITS_DATA_5;
624 dbg("%s - data bits = 5", __func__);
625 break;
626 case CS6:
627 bits |= BITS_DATA_6;
628 dbg("%s - data bits = 6", __func__);
629 break;
630 case CS7:
631 bits |= BITS_DATA_7;
632 dbg("%s - data bits = 7", __func__);
633 break;
634 case CS8:
635 bits |= BITS_DATA_8;
636 dbg("%s - data bits = 8", __func__);
637 break;
638 /*case CS9:
639 bits |= BITS_DATA_9;
640 dbg("%s - data bits = 9", __func__);
641 break;*/
642 default:
643 dbg("cp210x driver does not "
644 "support the number of bits requested,"
645 " using 8 bit mode\n");
646 bits |= BITS_DATA_8;
647 break;
648 }
649 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
650 dbg("Number of data bits requested "
651 "not supported by device\n");
652 }
653
654 if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
655 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
656 bits &= ~BITS_PARITY_MASK;
657 if (cflag & PARENB) {
658 if (cflag & PARODD) {
659 bits |= BITS_PARITY_ODD;
660 dbg("%s - parity = ODD", __func__);
661 } else {
662 bits |= BITS_PARITY_EVEN;
663 dbg("%s - parity = EVEN", __func__);
664 }
665 }
666 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
667 dbg("Parity mode not supported "
668 "by device\n");
669 }
670
671 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
672 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
673 bits &= ~BITS_STOP_MASK;
674 if (cflag & CSTOPB) {
675 bits |= BITS_STOP_2;
676 dbg("%s - stop bits = 2", __func__);
677 } else {
678 bits |= BITS_STOP_1;
679 dbg("%s - stop bits = 1", __func__);
680 }
681 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
682 dbg("Number of stop bits requested "
683 "not supported by device\n");
684 }
685
686 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
687 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
688 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
689 __func__, modem_ctl[0], modem_ctl[1],
690 modem_ctl[2], modem_ctl[3]);
691
692 if (cflag & CRTSCTS) {
693 modem_ctl[0] &= ~0x7B;
694 modem_ctl[0] |= 0x09;
695 modem_ctl[1] = 0x80;
696 dbg("%s - flow control = CRTSCTS", __func__);
697 } else {
698 modem_ctl[0] &= ~0x7B;
699 modem_ctl[0] |= 0x01;
700 modem_ctl[1] |= 0x40;
701 dbg("%s - flow control = NONE", __func__);
702 }
703
704 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
705 __func__, modem_ctl[0], modem_ctl[1],
706 modem_ctl[2], modem_ctl[3]);
707 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16);
708 }
709
710 }
711
712 static int cp210x_tiocmset (struct tty_struct *tty, struct file *file,
713 unsigned int set, unsigned int clear)
714 {
715 struct usb_serial_port *port = tty->driver_data;
716 return cp210x_tiocmset_port(port, file, set, clear);
717 }
718
719 static int cp210x_tiocmset_port(struct usb_serial_port *port, struct file *file,
720 unsigned int set, unsigned int clear)
721 {
722 unsigned int control = 0;
723
724 dbg("%s - port %d", __func__, port->number);
725
726 if (set & TIOCM_RTS) {
727 control |= CONTROL_RTS;
728 control |= CONTROL_WRITE_RTS;
729 }
730 if (set & TIOCM_DTR) {
731 control |= CONTROL_DTR;
732 control |= CONTROL_WRITE_DTR;
733 }
734 if (clear & TIOCM_RTS) {
735 control &= ~CONTROL_RTS;
736 control |= CONTROL_WRITE_RTS;
737 }
738 if (clear & TIOCM_DTR) {
739 control &= ~CONTROL_DTR;
740 control |= CONTROL_WRITE_DTR;
741 }
742
743 dbg("%s - control = 0x%.4x", __func__, control);
744
745 return cp210x_set_config(port, CP210X_SET_MHS, &control, 2);
746 }
747
748 static int cp210x_tiocmget (struct tty_struct *tty, struct file *file)
749 {
750 struct usb_serial_port *port = tty->driver_data;
751 unsigned int control;
752 int result;
753
754 dbg("%s - port %d", __func__, port->number);
755
756 cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1);
757
758 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
759 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
760 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
761 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
762 |((control & CONTROL_RING)? TIOCM_RI : 0)
763 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
764
765 dbg("%s - control = 0x%.2x", __func__, control);
766
767 return result;
768 }
769
770 static void cp210x_break_ctl (struct tty_struct *tty, int break_state)
771 {
772 struct usb_serial_port *port = tty->driver_data;
773 unsigned int state;
774
775 dbg("%s - port %d", __func__, port->number);
776 if (break_state == 0)
777 state = BREAK_OFF;
778 else
779 state = BREAK_ON;
780 dbg("%s - turning break %s", __func__,
781 state == BREAK_OFF ? "off" : "on");
782 cp210x_set_config(port, CP210X_SET_BREAK, &state, 2);
783 }
784
785 static int cp210x_startup(struct usb_serial *serial)
786 {
787 /* cp210x buffers behave strangely unless device is reset */
788 usb_reset_device(serial->dev);
789 return 0;
790 }
791
792 static void cp210x_disconnect(struct usb_serial *serial)
793 {
794 int i;
795
796 dbg("%s", __func__);
797
798 /* Stop reads and writes on all ports */
799 for (i = 0; i < serial->num_ports; ++i)
800 cp210x_cleanup(serial->port[i]);
801 }
802
803 static int __init cp210x_init(void)
804 {
805 int retval;
806
807 retval = usb_serial_register(&cp210x_device);
808 if (retval)
809 return retval; /* Failed to register */
810
811 retval = usb_register(&cp210x_driver);
812 if (retval) {
813 /* Failed to register */
814 usb_serial_deregister(&cp210x_device);
815 return retval;
816 }
817
818 /* Success */
819 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
820 DRIVER_DESC "\n");
821 return 0;
822 }
823
824 static void __exit cp210x_exit(void)
825 {
826 usb_deregister(&cp210x_driver);
827 usb_serial_deregister(&cp210x_device);
828 }
829
830 module_init(cp210x_init);
831 module_exit(cp210x_exit);
832
833 MODULE_DESCRIPTION(DRIVER_DESC);
834 MODULE_VERSION(DRIVER_VERSION);
835 MODULE_LICENSE("GPL");
836
837 module_param(debug, bool, S_IRUGO | S_IWUSR);
838 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");
Support for the Chinese Samsung S3C2440 based development boards