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regmap: add helper macro to set min/max range of register
[deliverable/linux.git] / drivers / usb / serial / pl2303.c
1 /*
2 * Prolific PL2303 USB to serial adaptor driver
3 *
4 * Copyright (C) 2001-2007 Greg Kroah-Hartman (greg@kroah.com)
5 * Copyright (C) 2003 IBM Corp.
6 *
7 * Copyright (C) 2009, 2013 Frank Schäfer <fschaefer.oss@googlemail.com>
8 * - fixes, improvements and documentation for the baud rate encoding methods
9 * Copyright (C) 2013 Reinhard Max <max@suse.de>
10 * - fixes and improvements for the divisor based baud rate encoding method
11 *
12 * Original driver for 2.2.x by anonymous
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License version
16 * 2 as published by the Free Software Foundation.
17 *
18 * See Documentation/usb/usb-serial.txt for more information on using this
19 * driver
20 *
21 */
22
23 #include <linux/kernel.h>
24 #include <linux/errno.h>
25 #include <linux/init.h>
26 #include <linux/slab.h>
27 #include <linux/tty.h>
28 #include <linux/tty_driver.h>
29 #include <linux/tty_flip.h>
30 #include <linux/serial.h>
31 #include <linux/module.h>
32 #include <linux/moduleparam.h>
33 #include <linux/spinlock.h>
34 #include <linux/uaccess.h>
35 #include <linux/usb.h>
36 #include <linux/usb/serial.h>
37 #include <asm/unaligned.h>
38 #include "pl2303.h"
39
40 /*
41 * Version Information
42 */
43 #define DRIVER_DESC "Prolific PL2303 USB to serial adaptor driver"
44
45 static const struct usb_device_id id_table[] = {
46 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) },
47 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
48 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_DCU11) },
49 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
50 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) },
51 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ALDIGA) },
52 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MMX) },
53 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GPRS) },
54 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_HCR331) },
55 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MOTOROLA) },
56 { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
57 { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID_RSAQ5) },
58 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) },
59 { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
60 { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
61 { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
62 { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
63 { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) },
64 { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
65 { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
66 { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
67 { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
68 { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
69 { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
70 { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
71 { USB_DEVICE(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_ID) },
72 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1) },
73 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65) },
74 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75) },
75 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_EF81) },
76 { USB_DEVICE(BENQ_VENDOR_ID, BENQ_PRODUCT_ID_S81) }, /* Benq/Siemens S81 */
77 { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
78 { USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },
79 { USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) },
80 { USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) },
81 { USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) },
82 { USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) },
83 { USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) },
84 { USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) },
85 { USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID) },
86 { USB_DEVICE(WS002IN_VENDOR_ID, WS002IN_PRODUCT_ID) },
87 { USB_DEVICE(COREGA_VENDOR_ID, COREGA_PRODUCT_ID) },
88 { USB_DEVICE(YCCABLE_VENDOR_ID, YCCABLE_PRODUCT_ID) },
89 { USB_DEVICE(SUPERIAL_VENDOR_ID, SUPERIAL_PRODUCT_ID) },
90 { USB_DEVICE(HP_VENDOR_ID, HP_LD220_PRODUCT_ID) },
91 { USB_DEVICE(CRESSI_VENDOR_ID, CRESSI_EDY_PRODUCT_ID) },
92 { USB_DEVICE(ZEAGLE_VENDOR_ID, ZEAGLE_N2ITION3_PRODUCT_ID) },
93 { USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) },
94 { USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) },
95 { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530_PRODUCT_ID) },
96 { USB_DEVICE(SMART_VENDOR_ID, SMART_PRODUCT_ID) },
97 { } /* Terminating entry */
98 };
99
100 MODULE_DEVICE_TABLE(usb, id_table);
101
102 #define SET_LINE_REQUEST_TYPE 0x21
103 #define SET_LINE_REQUEST 0x20
104
105 #define SET_CONTROL_REQUEST_TYPE 0x21
106 #define SET_CONTROL_REQUEST 0x22
107 #define CONTROL_DTR 0x01
108 #define CONTROL_RTS 0x02
109
110 #define BREAK_REQUEST_TYPE 0x21
111 #define BREAK_REQUEST 0x23
112 #define BREAK_ON 0xffff
113 #define BREAK_OFF 0x0000
114
115 #define GET_LINE_REQUEST_TYPE 0xa1
116 #define GET_LINE_REQUEST 0x21
117
118 #define VENDOR_WRITE_REQUEST_TYPE 0x40
119 #define VENDOR_WRITE_REQUEST 0x01
120
121 #define VENDOR_READ_REQUEST_TYPE 0xc0
122 #define VENDOR_READ_REQUEST 0x01
123
124 #define UART_STATE 0x08
125 #define UART_STATE_TRANSIENT_MASK 0x74
126 #define UART_DCD 0x01
127 #define UART_DSR 0x02
128 #define UART_BREAK_ERROR 0x04
129 #define UART_RING 0x08
130 #define UART_FRAME_ERROR 0x10
131 #define UART_PARITY_ERROR 0x20
132 #define UART_OVERRUN_ERROR 0x40
133 #define UART_CTS 0x80
134
135
136 enum pl2303_type {
137 type_0, /* H version ? */
138 type_1, /* H version ? */
139 HX_TA, /* HX(A) / X(A) / TA version */ /* TODO: improve */
140 HXD_EA_RA_SA, /* HXD / EA / RA / SA version */ /* TODO: improve */
141 TB, /* TB version */
142 };
143 /*
144 * NOTE: don't know the difference between type 0 and type 1,
145 * until someone from Prolific tells us...
146 * TODO: distinguish between X/HX, TA and HXD, EA, RA, SA variants
147 */
148
149 struct pl2303_serial_private {
150 enum pl2303_type type;
151 };
152
153 struct pl2303_private {
154 spinlock_t lock;
155 u8 line_control;
156 u8 line_status;
157 };
158
159 static int pl2303_vendor_read(__u16 value, __u16 index,
160 struct usb_serial *serial, unsigned char *buf)
161 {
162 int res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
163 VENDOR_READ_REQUEST, VENDOR_READ_REQUEST_TYPE,
164 value, index, buf, 1, 100);
165 dev_dbg(&serial->interface->dev, "0x%x:0x%x:0x%x:0x%x %d - %x\n",
166 VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, value, index,
167 res, buf[0]);
168 return res;
169 }
170
171 static int pl2303_vendor_write(__u16 value, __u16 index,
172 struct usb_serial *serial)
173 {
174 int res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
175 VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE,
176 value, index, NULL, 0, 100);
177 dev_dbg(&serial->interface->dev, "0x%x:0x%x:0x%x:0x%x %d\n",
178 VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, value, index,
179 res);
180 return res;
181 }
182
183 static int pl2303_startup(struct usb_serial *serial)
184 {
185 struct pl2303_serial_private *spriv;
186 enum pl2303_type type = type_0;
187 char *type_str = "unknown (treating as type_0)";
188 unsigned char *buf;
189
190 spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
191 if (!spriv)
192 return -ENOMEM;
193
194 buf = kmalloc(10, GFP_KERNEL);
195 if (!buf) {
196 kfree(spriv);
197 return -ENOMEM;
198 }
199
200 if (serial->dev->descriptor.bDeviceClass == 0x02) {
201 type = type_0;
202 type_str = "type_0";
203 } else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40) {
204 /*
205 * NOTE: The bcdDevice version is the only difference between
206 * the device descriptors of the X/HX, HXD, EA, RA, SA, TA, TB
207 */
208 if (le16_to_cpu(serial->dev->descriptor.bcdDevice) == 0x300) {
209 type = HX_TA;
210 type_str = "X/HX/TA";
211 } else if (le16_to_cpu(serial->dev->descriptor.bcdDevice)
212 == 0x400) {
213 type = HXD_EA_RA_SA;
214 type_str = "HXD/EA/RA/SA";
215 } else if (le16_to_cpu(serial->dev->descriptor.bcdDevice)
216 == 0x500) {
217 type = TB;
218 type_str = "TB";
219 } else {
220 dev_info(&serial->interface->dev,
221 "unknown/unsupported device type\n");
222 kfree(spriv);
223 kfree(buf);
224 return -ENODEV;
225 }
226 } else if (serial->dev->descriptor.bDeviceClass == 0x00
227 || serial->dev->descriptor.bDeviceClass == 0xFF) {
228 type = type_1;
229 type_str = "type_1";
230 }
231 dev_dbg(&serial->interface->dev, "device type: %s\n", type_str);
232
233 spriv->type = type;
234 usb_set_serial_data(serial, spriv);
235
236 pl2303_vendor_read(0x8484, 0, serial, buf);
237 pl2303_vendor_write(0x0404, 0, serial);
238 pl2303_vendor_read(0x8484, 0, serial, buf);
239 pl2303_vendor_read(0x8383, 0, serial, buf);
240 pl2303_vendor_read(0x8484, 0, serial, buf);
241 pl2303_vendor_write(0x0404, 1, serial);
242 pl2303_vendor_read(0x8484, 0, serial, buf);
243 pl2303_vendor_read(0x8383, 0, serial, buf);
244 pl2303_vendor_write(0, 1, serial);
245 pl2303_vendor_write(1, 0, serial);
246 if (type == type_0 || type == type_1)
247 pl2303_vendor_write(2, 0x24, serial);
248 else
249 pl2303_vendor_write(2, 0x44, serial);
250
251 kfree(buf);
252 return 0;
253 }
254
255 static void pl2303_release(struct usb_serial *serial)
256 {
257 struct pl2303_serial_private *spriv;
258
259 spriv = usb_get_serial_data(serial);
260 kfree(spriv);
261 }
262
263 static int pl2303_port_probe(struct usb_serial_port *port)
264 {
265 struct pl2303_private *priv;
266
267 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
268 if (!priv)
269 return -ENOMEM;
270
271 spin_lock_init(&priv->lock);
272
273 usb_set_serial_port_data(port, priv);
274
275 port->port.drain_delay = 256;
276
277 return 0;
278 }
279
280 static int pl2303_port_remove(struct usb_serial_port *port)
281 {
282 struct pl2303_private *priv;
283
284 priv = usb_get_serial_port_data(port);
285 kfree(priv);
286
287 return 0;
288 }
289
290 static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value)
291 {
292 struct usb_device *dev = port->serial->dev;
293 int retval;
294
295 retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
296 SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
297 value, 0, NULL, 0, 100);
298 dev_dbg(&port->dev, "%s - value = %d, retval = %d\n", __func__,
299 value, retval);
300 return retval;
301 }
302
303 static int pl2303_baudrate_encode_direct(int baud, enum pl2303_type type,
304 u8 buf[4])
305 {
306 /*
307 * NOTE: Only the values defined in baud_sup are supported !
308 * => if unsupported values are set, the PL2303 seems to
309 * use 9600 baud (at least my PL2303X always does)
310 */
311 const int baud_sup[] = { 75, 150, 300, 600, 1200, 1800, 2400, 3600,
312 4800, 7200, 9600, 14400, 19200, 28800, 38400,
313 57600, 115200, 230400, 460800, 614400, 921600,
314 1228800, 2457600, 3000000, 6000000, 12000000 };
315 /*
316 * NOTE: With the exception of type_0/1 devices, the following
317 * additional baud rates are supported (tested with HX rev. 3A only):
318 * 110*, 56000*, 128000, 134400, 161280, 201600, 256000*, 268800,
319 * 403200, 806400. (*: not HX)
320 *
321 * Maximum values: HXD, TB: 12000000; HX, TA: 6000000;
322 * type_0+1: 1228800; RA: 921600; SA: 115200
323 *
324 * As long as we are not using this encoding method for anything else
325 * than the type_0+1 and HX chips, there is no point in complicating
326 * the code to support them.
327 */
328 int i;
329
330 /* Set baudrate to nearest supported value */
331 for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) {
332 if (baud_sup[i] > baud)
333 break;
334 }
335 if (i == ARRAY_SIZE(baud_sup))
336 baud = baud_sup[i - 1];
337 else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1]))
338 baud = baud_sup[i - 1];
339 else
340 baud = baud_sup[i];
341 /* Respect the chip type specific baud rate limits */
342 /*
343 * FIXME: as long as we don't know how to distinguish between the
344 * HXD, EA, RA, and SA chip variants, allow the max. value of 12M.
345 */
346 if (type == HX_TA)
347 baud = min_t(int, baud, 6000000);
348 else if (type == type_0 || type == type_1)
349 baud = min_t(int, baud, 1228800);
350 /* Direct (standard) baud rate encoding method */
351 put_unaligned_le32(baud, buf);
352
353 return baud;
354 }
355
356 static int pl2303_baudrate_encode_divisor(int baud, enum pl2303_type type,
357 u8 buf[4])
358 {
359 /*
360 * Divisor based baud rate encoding method
361 *
362 * NOTE: it's not clear if the type_0/1 chips support this method
363 *
364 * divisor = 12MHz * 32 / baudrate = 2^A * B
365 *
366 * with
367 *
368 * A = buf[1] & 0x0e
369 * B = buf[0] + (buf[1] & 0x01) << 8
370 *
371 * Special cases:
372 * => 8 < B < 16: device seems to work not properly
373 * => B <= 8: device uses the max. value B = 512 instead
374 */
375 unsigned int A, B;
376
377 /*
378 * NOTE: The Windows driver allows maximum baud rates of 110% of the
379 * specified maximium value.
380 * Quick tests with early (2004) HX (rev. A) chips suggest, that even
381 * higher baud rates (up to the maximum of 24M baud !) are working fine,
382 * but that should really be tested carefully in "real life" scenarios
383 * before removing the upper limit completely.
384 * Baud rates smaller than the specified 75 baud are definitely working
385 * fine.
386 */
387 if (type == type_0 || type == type_1)
388 baud = min_t(int, baud, 1228800 * 1.1);
389 else if (type == HX_TA)
390 baud = min_t(int, baud, 6000000 * 1.1);
391 else if (type == HXD_EA_RA_SA)
392 /* HXD, EA: 12Mbps; RA: 1Mbps; SA: 115200 bps */
393 /*
394 * FIXME: as long as we don't know how to distinguish between
395 * these chip variants, allow the max. of these values
396 */
397 baud = min_t(int, baud, 12000000 * 1.1);
398 else if (type == TB)
399 baud = min_t(int, baud, 12000000 * 1.1);
400 /* Determine factors A and B */
401 A = 0;
402 B = 12000000 * 32 / baud; /* 12MHz */
403 B <<= 1; /* Add one bit for rounding */
404 while (B > (512 << 1) && A <= 14) {
405 A += 2;
406 B >>= 2;
407 }
408 if (A > 14) { /* max. divisor = min. baudrate reached */
409 A = 14;
410 B = 512;
411 /* => ~45.78 baud */
412 } else {
413 B = (B + 1) >> 1; /* Round the last bit */
414 }
415 /* Handle special cases */
416 if (B == 512)
417 B = 0; /* also: 1 to 8 */
418 else if (B < 16)
419 /*
420 * NOTE: With the current algorithm this happens
421 * only for A=0 and means that the min. divisor
422 * (respectively: the max. baudrate) is reached.
423 */
424 B = 16; /* => 24 MBaud */
425 /* Encode the baud rate */
426 buf[3] = 0x80; /* Select divisor encoding method */
427 buf[2] = 0;
428 buf[1] = (A & 0x0e); /* A */
429 buf[1] |= ((B & 0x100) >> 8); /* MSB of B */
430 buf[0] = B & 0xff; /* 8 LSBs of B */
431 /* Calculate the actual/resulting baud rate */
432 if (B <= 8)
433 B = 512;
434 baud = 12000000 * 32 / ((1 << A) * B);
435
436 return baud;
437 }
438
439 static void pl2303_encode_baudrate(struct tty_struct *tty,
440 struct usb_serial_port *port,
441 enum pl2303_type type,
442 u8 buf[4])
443 {
444 int baud;
445
446 baud = tty_get_baud_rate(tty);
447 dev_dbg(&port->dev, "baud requested = %d\n", baud);
448 if (!baud)
449 return;
450 /*
451 * There are two methods for setting/encoding the baud rate
452 * 1) Direct method: encodes the baud rate value directly
453 * => supported by all chip types
454 * 2) Divisor based method: encodes a divisor to a base value (12MHz*32)
455 * => supported by HX chips (and likely not by type_0/1 chips)
456 *
457 * NOTE: Although the divisor based baud rate encoding method is much
458 * more flexible, some of the standard baud rate values can not be
459 * realized exactly. But the difference is very small (max. 0.2%) and
460 * the device likely uses the same baud rate generator for both methods
461 * so that there is likley no difference.
462 */
463 if (type == type_0 || type == type_1)
464 baud = pl2303_baudrate_encode_direct(baud, type, buf);
465 else
466 baud = pl2303_baudrate_encode_divisor(baud, type, buf);
467 /* Save resulting baud rate */
468 tty_encode_baud_rate(tty, baud, baud);
469 dev_dbg(&port->dev, "baud set = %d\n", baud);
470 }
471
472 static void pl2303_set_termios(struct tty_struct *tty,
473 struct usb_serial_port *port, struct ktermios *old_termios)
474 {
475 struct usb_serial *serial = port->serial;
476 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
477 struct pl2303_private *priv = usb_get_serial_port_data(port);
478 unsigned long flags;
479 unsigned char *buf;
480 int i;
481 u8 control;
482
483 /*
484 * The PL2303 is reported to lose bytes if you change serial settings
485 * even to the same values as before. Thus we actually need to filter
486 * in this specific case.
487 */
488 if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
489 return;
490
491 buf = kzalloc(7, GFP_KERNEL);
492 if (!buf) {
493 dev_err(&port->dev, "%s - out of memory.\n", __func__);
494 /* Report back no change occurred */
495 if (old_termios)
496 tty->termios = *old_termios;
497 return;
498 }
499
500 i = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
501 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
502 0, 0, buf, 7, 100);
503 dev_dbg(&port->dev, "0xa1:0x21:0:0 %d - %7ph\n", i, buf);
504
505 if (C_CSIZE(tty)) {
506 switch (C_CSIZE(tty)) {
507 case CS5:
508 buf[6] = 5;
509 break;
510 case CS6:
511 buf[6] = 6;
512 break;
513 case CS7:
514 buf[6] = 7;
515 break;
516 default:
517 case CS8:
518 buf[6] = 8;
519 }
520 dev_dbg(&port->dev, "data bits = %d\n", buf[6]);
521 }
522
523 /* For reference: buf[0]:buf[3] baud rate value */
524 pl2303_encode_baudrate(tty, port, spriv->type, buf);
525
526 /* For reference buf[4]=0 is 1 stop bits */
527 /* For reference buf[4]=1 is 1.5 stop bits */
528 /* For reference buf[4]=2 is 2 stop bits */
529 if (C_CSTOPB(tty)) {
530 /*
531 * NOTE: Comply with "real" UARTs / RS232:
532 * use 1.5 instead of 2 stop bits with 5 data bits
533 */
534 if (C_CSIZE(tty) == CS5) {
535 buf[4] = 1;
536 dev_dbg(&port->dev, "stop bits = 1.5\n");
537 } else {
538 buf[4] = 2;
539 dev_dbg(&port->dev, "stop bits = 2\n");
540 }
541 } else {
542 buf[4] = 0;
543 dev_dbg(&port->dev, "stop bits = 1\n");
544 }
545
546 if (C_PARENB(tty)) {
547 /* For reference buf[5]=0 is none parity */
548 /* For reference buf[5]=1 is odd parity */
549 /* For reference buf[5]=2 is even parity */
550 /* For reference buf[5]=3 is mark parity */
551 /* For reference buf[5]=4 is space parity */
552 if (C_PARODD(tty)) {
553 if (tty->termios.c_cflag & CMSPAR) {
554 buf[5] = 3;
555 dev_dbg(&port->dev, "parity = mark\n");
556 } else {
557 buf[5] = 1;
558 dev_dbg(&port->dev, "parity = odd\n");
559 }
560 } else {
561 if (tty->termios.c_cflag & CMSPAR) {
562 buf[5] = 4;
563 dev_dbg(&port->dev, "parity = space\n");
564 } else {
565 buf[5] = 2;
566 dev_dbg(&port->dev, "parity = even\n");
567 }
568 }
569 } else {
570 buf[5] = 0;
571 dev_dbg(&port->dev, "parity = none\n");
572 }
573
574 i = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
575 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
576 0, 0, buf, 7, 100);
577 dev_dbg(&port->dev, "0x21:0x20:0:0 %d\n", i);
578
579 /* change control lines if we are switching to or from B0 */
580 spin_lock_irqsave(&priv->lock, flags);
581 control = priv->line_control;
582 if (C_BAUD(tty) == B0)
583 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
584 else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
585 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
586 if (control != priv->line_control) {
587 control = priv->line_control;
588 spin_unlock_irqrestore(&priv->lock, flags);
589 pl2303_set_control_lines(port, control);
590 } else {
591 spin_unlock_irqrestore(&priv->lock, flags);
592 }
593
594 memset(buf, 0, 7);
595 i = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
596 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
597 0, 0, buf, 7, 100);
598 dev_dbg(&port->dev, "0xa1:0x21:0:0 %d - %7ph\n", i, buf);
599
600 if (C_CRTSCTS(tty)) {
601 if (spriv->type == type_0 || spriv->type == type_1)
602 pl2303_vendor_write(0x0, 0x41, serial);
603 else
604 pl2303_vendor_write(0x0, 0x61, serial);
605 } else {
606 pl2303_vendor_write(0x0, 0x0, serial);
607 }
608
609 kfree(buf);
610 }
611
612 static void pl2303_dtr_rts(struct usb_serial_port *port, int on)
613 {
614 struct pl2303_private *priv = usb_get_serial_port_data(port);
615 unsigned long flags;
616 u8 control;
617
618 spin_lock_irqsave(&priv->lock, flags);
619 /* Change DTR and RTS */
620 if (on)
621 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
622 else
623 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
624 control = priv->line_control;
625 spin_unlock_irqrestore(&priv->lock, flags);
626 pl2303_set_control_lines(port, control);
627 }
628
629 static void pl2303_close(struct usb_serial_port *port)
630 {
631 usb_serial_generic_close(port);
632 usb_kill_urb(port->interrupt_in_urb);
633 }
634
635 static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port)
636 {
637 struct usb_serial *serial = port->serial;
638 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
639 int result;
640
641 if (spriv->type == type_0 || spriv->type == type_1) {
642 usb_clear_halt(serial->dev, port->write_urb->pipe);
643 usb_clear_halt(serial->dev, port->read_urb->pipe);
644 } else {
645 /* reset upstream data pipes */
646 pl2303_vendor_write(8, 0, serial);
647 pl2303_vendor_write(9, 0, serial);
648 }
649
650 /* Setup termios */
651 if (tty)
652 pl2303_set_termios(tty, port, NULL);
653
654 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
655 if (result) {
656 dev_err(&port->dev, "%s - failed submitting interrupt urb,"
657 " error %d\n", __func__, result);
658 return result;
659 }
660
661 result = usb_serial_generic_open(tty, port);
662 if (result) {
663 usb_kill_urb(port->interrupt_in_urb);
664 return result;
665 }
666
667 return 0;
668 }
669
670 static int pl2303_tiocmset(struct tty_struct *tty,
671 unsigned int set, unsigned int clear)
672 {
673 struct usb_serial_port *port = tty->driver_data;
674 struct pl2303_private *priv = usb_get_serial_port_data(port);
675 unsigned long flags;
676 u8 control;
677 int ret;
678
679 spin_lock_irqsave(&priv->lock, flags);
680 if (set & TIOCM_RTS)
681 priv->line_control |= CONTROL_RTS;
682 if (set & TIOCM_DTR)
683 priv->line_control |= CONTROL_DTR;
684 if (clear & TIOCM_RTS)
685 priv->line_control &= ~CONTROL_RTS;
686 if (clear & TIOCM_DTR)
687 priv->line_control &= ~CONTROL_DTR;
688 control = priv->line_control;
689 spin_unlock_irqrestore(&priv->lock, flags);
690
691 ret = pl2303_set_control_lines(port, control);
692 if (ret)
693 return usb_translate_errors(ret);
694
695 return 0;
696 }
697
698 static int pl2303_tiocmget(struct tty_struct *tty)
699 {
700 struct usb_serial_port *port = tty->driver_data;
701 struct pl2303_private *priv = usb_get_serial_port_data(port);
702 unsigned long flags;
703 unsigned int mcr;
704 unsigned int status;
705 unsigned int result;
706
707 spin_lock_irqsave(&priv->lock, flags);
708 mcr = priv->line_control;
709 status = priv->line_status;
710 spin_unlock_irqrestore(&priv->lock, flags);
711
712 result = ((mcr & CONTROL_DTR) ? TIOCM_DTR : 0)
713 | ((mcr & CONTROL_RTS) ? TIOCM_RTS : 0)
714 | ((status & UART_CTS) ? TIOCM_CTS : 0)
715 | ((status & UART_DSR) ? TIOCM_DSR : 0)
716 | ((status & UART_RING) ? TIOCM_RI : 0)
717 | ((status & UART_DCD) ? TIOCM_CD : 0);
718
719 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
720
721 return result;
722 }
723
724 static int pl2303_carrier_raised(struct usb_serial_port *port)
725 {
726 struct pl2303_private *priv = usb_get_serial_port_data(port);
727 if (priv->line_status & UART_DCD)
728 return 1;
729 return 0;
730 }
731
732 static int pl2303_tiocmiwait(struct tty_struct *tty, unsigned long arg)
733 {
734 struct usb_serial_port *port = tty->driver_data;
735 struct pl2303_private *priv = usb_get_serial_port_data(port);
736 unsigned long flags;
737 unsigned int prevstatus;
738 unsigned int status;
739 unsigned int changed;
740
741 spin_lock_irqsave(&priv->lock, flags);
742 prevstatus = priv->line_status;
743 spin_unlock_irqrestore(&priv->lock, flags);
744
745 while (1) {
746 interruptible_sleep_on(&port->port.delta_msr_wait);
747 /* see if a signal did it */
748 if (signal_pending(current))
749 return -ERESTARTSYS;
750
751 if (port->serial->disconnected)
752 return -EIO;
753
754 spin_lock_irqsave(&priv->lock, flags);
755 status = priv->line_status;
756 spin_unlock_irqrestore(&priv->lock, flags);
757
758 changed = prevstatus ^ status;
759
760 if (((arg & TIOCM_RNG) && (changed & UART_RING)) ||
761 ((arg & TIOCM_DSR) && (changed & UART_DSR)) ||
762 ((arg & TIOCM_CD) && (changed & UART_DCD)) ||
763 ((arg & TIOCM_CTS) && (changed & UART_CTS))) {
764 return 0;
765 }
766 prevstatus = status;
767 }
768 /* NOTREACHED */
769 return 0;
770 }
771
772 static int pl2303_ioctl(struct tty_struct *tty,
773 unsigned int cmd, unsigned long arg)
774 {
775 struct serial_struct ser;
776 struct usb_serial_port *port = tty->driver_data;
777
778 dev_dbg(&port->dev, "%s cmd = 0x%04x\n", __func__, cmd);
779
780 switch (cmd) {
781 case TIOCGSERIAL:
782 memset(&ser, 0, sizeof ser);
783 ser.type = PORT_16654;
784 ser.line = port->minor;
785 ser.port = port->port_number;
786 ser.baud_base = 460800;
787
788 if (copy_to_user((void __user *)arg, &ser, sizeof ser))
789 return -EFAULT;
790
791 return 0;
792 default:
793 dev_dbg(&port->dev, "%s not supported = 0x%04x\n", __func__, cmd);
794 break;
795 }
796 return -ENOIOCTLCMD;
797 }
798
799 static void pl2303_break_ctl(struct tty_struct *tty, int break_state)
800 {
801 struct usb_serial_port *port = tty->driver_data;
802 struct usb_serial *serial = port->serial;
803 u16 state;
804 int result;
805
806 if (break_state == 0)
807 state = BREAK_OFF;
808 else
809 state = BREAK_ON;
810 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
811 state == BREAK_OFF ? "off" : "on");
812
813 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
814 BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
815 0, NULL, 0, 100);
816 if (result)
817 dev_err(&port->dev, "error sending break = %d\n", result);
818 }
819
820 static void pl2303_update_line_status(struct usb_serial_port *port,
821 unsigned char *data,
822 unsigned int actual_length)
823 {
824
825 struct pl2303_private *priv = usb_get_serial_port_data(port);
826 struct tty_struct *tty;
827 unsigned long flags;
828 u8 status_idx = UART_STATE;
829 u8 length = UART_STATE + 1;
830 u8 prev_line_status;
831 u16 idv, idp;
832
833 idv = le16_to_cpu(port->serial->dev->descriptor.idVendor);
834 idp = le16_to_cpu(port->serial->dev->descriptor.idProduct);
835
836
837 if (idv == SIEMENS_VENDOR_ID) {
838 if (idp == SIEMENS_PRODUCT_ID_X65 ||
839 idp == SIEMENS_PRODUCT_ID_SX1 ||
840 idp == SIEMENS_PRODUCT_ID_X75) {
841
842 length = 1;
843 status_idx = 0;
844 }
845 }
846
847 if (actual_length < length)
848 return;
849
850 /* Save off the uart status for others to look at */
851 spin_lock_irqsave(&priv->lock, flags);
852 prev_line_status = priv->line_status;
853 priv->line_status = data[status_idx];
854 spin_unlock_irqrestore(&priv->lock, flags);
855 if (priv->line_status & UART_BREAK_ERROR)
856 usb_serial_handle_break(port);
857 wake_up_interruptible(&port->port.delta_msr_wait);
858
859 tty = tty_port_tty_get(&port->port);
860 if (!tty)
861 return;
862 if ((priv->line_status ^ prev_line_status) & UART_DCD)
863 usb_serial_handle_dcd_change(port, tty,
864 priv->line_status & UART_DCD);
865 tty_kref_put(tty);
866 }
867
868 static void pl2303_read_int_callback(struct urb *urb)
869 {
870 struct usb_serial_port *port = urb->context;
871 unsigned char *data = urb->transfer_buffer;
872 unsigned int actual_length = urb->actual_length;
873 int status = urb->status;
874 int retval;
875
876 switch (status) {
877 case 0:
878 /* success */
879 break;
880 case -ECONNRESET:
881 case -ENOENT:
882 case -ESHUTDOWN:
883 /* this urb is terminated, clean up */
884 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
885 __func__, status);
886 return;
887 default:
888 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
889 __func__, status);
890 goto exit;
891 }
892
893 usb_serial_debug_data(&port->dev, __func__,
894 urb->actual_length, urb->transfer_buffer);
895
896 pl2303_update_line_status(port, data, actual_length);
897
898 exit:
899 retval = usb_submit_urb(urb, GFP_ATOMIC);
900 if (retval)
901 dev_err(&port->dev,
902 "%s - usb_submit_urb failed with result %d\n",
903 __func__, retval);
904 }
905
906 static void pl2303_process_read_urb(struct urb *urb)
907 {
908 struct usb_serial_port *port = urb->context;
909 struct pl2303_private *priv = usb_get_serial_port_data(port);
910 unsigned char *data = urb->transfer_buffer;
911 char tty_flag = TTY_NORMAL;
912 unsigned long flags;
913 u8 line_status;
914 int i;
915
916 /* update line status */
917 spin_lock_irqsave(&priv->lock, flags);
918 line_status = priv->line_status;
919 priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
920 spin_unlock_irqrestore(&priv->lock, flags);
921 wake_up_interruptible(&port->port.delta_msr_wait);
922
923 if (!urb->actual_length)
924 return;
925
926 /* break takes precedence over parity, */
927 /* which takes precedence over framing errors */
928 if (line_status & UART_BREAK_ERROR)
929 tty_flag = TTY_BREAK;
930 else if (line_status & UART_PARITY_ERROR)
931 tty_flag = TTY_PARITY;
932 else if (line_status & UART_FRAME_ERROR)
933 tty_flag = TTY_FRAME;
934
935 if (tty_flag != TTY_NORMAL)
936 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__,
937 tty_flag);
938 /* overrun is special, not associated with a char */
939 if (line_status & UART_OVERRUN_ERROR)
940 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
941
942 if (port->port.console && port->sysrq) {
943 for (i = 0; i < urb->actual_length; ++i)
944 if (!usb_serial_handle_sysrq_char(port, data[i]))
945 tty_insert_flip_char(&port->port, data[i],
946 tty_flag);
947 } else {
948 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
949 urb->actual_length);
950 }
951
952 tty_flip_buffer_push(&port->port);
953 }
954
955 /* All of the device info needed for the PL2303 SIO serial converter */
956 static struct usb_serial_driver pl2303_device = {
957 .driver = {
958 .owner = THIS_MODULE,
959 .name = "pl2303",
960 },
961 .id_table = id_table,
962 .num_ports = 1,
963 .bulk_in_size = 256,
964 .bulk_out_size = 256,
965 .open = pl2303_open,
966 .close = pl2303_close,
967 .dtr_rts = pl2303_dtr_rts,
968 .carrier_raised = pl2303_carrier_raised,
969 .ioctl = pl2303_ioctl,
970 .break_ctl = pl2303_break_ctl,
971 .set_termios = pl2303_set_termios,
972 .tiocmget = pl2303_tiocmget,
973 .tiocmset = pl2303_tiocmset,
974 .tiocmiwait = pl2303_tiocmiwait,
975 .process_read_urb = pl2303_process_read_urb,
976 .read_int_callback = pl2303_read_int_callback,
977 .attach = pl2303_startup,
978 .release = pl2303_release,
979 .port_probe = pl2303_port_probe,
980 .port_remove = pl2303_port_remove,
981 };
982
983 static struct usb_serial_driver * const serial_drivers[] = {
984 &pl2303_device, NULL
985 };
986
987 module_usb_serial_driver(serial_drivers, id_table);
988
989 MODULE_DESCRIPTION(DRIVER_DESC);
990 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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