pl2303.c 24.5 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1
2
3
/*
 * Prolific PL2303 USB to serial adaptor driver
 *
4
 * Copyright (C) 2001-2007 Greg Kroah-Hartman (greg@kroah.com)
Linus Torvalds's avatar
Linus Torvalds committed
5
6
7
8
 * Copyright (C) 2003 IBM Corp.
 *
 * Original driver for 2.2.x by anonymous
 *
9
10
11
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License version
 *	2 as published by the Free Software Foundation.
Linus Torvalds's avatar
Linus Torvalds committed
12
 *
Alan Cox's avatar
Alan Cox committed
13
14
 * See Documentation/usb/usb-serial.txt for more information on using this
 * driver
Linus Torvalds's avatar
Linus Torvalds committed
15
16
17
18
19
20
21
22
23
24
25
26
27
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/spinlock.h>
Alan Cox's avatar
Alan Cox committed
28
#include <linux/uaccess.h>
Linus Torvalds's avatar
Linus Torvalds committed
29
#include <linux/usb.h>
30
#include <linux/usb/serial.h>
31
#include <asm/unaligned.h>
Linus Torvalds's avatar
Linus Torvalds committed
32
33
#include "pl2303.h"

34
35

#define PL2303_QUIRK_UART_STATE_IDX0		BIT(0)
36
#define PL2303_QUIRK_LEGACY			BIT(1)
37

38
static const struct usb_device_id id_table[] = {
Linus Torvalds's avatar
Linus Torvalds committed
39
40
	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) },
	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
41
	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_DCU11) },
Linus Torvalds's avatar
Linus Torvalds committed
42
43
	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) },
Max Arnold's avatar
Max Arnold committed
44
	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ALDIGA) },
Steve Murphy's avatar
Steve Murphy committed
45
	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MMX) },
46
	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GPRS) },
47
	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_HCR331) },
48
	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MOTOROLA) },
Linus Torvalds's avatar
Linus Torvalds committed
49
	{ USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
50
	{ USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID_RSAQ5) },
Linus Torvalds's avatar
Linus Torvalds committed
51
52
53
54
55
	{ USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) },
	{ USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
	{ USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
	{ USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
	{ USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
56
	{ USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) },
Linus Torvalds's avatar
Linus Torvalds committed
57
58
59
60
61
62
63
64
	{ USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
	{ USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
	{ USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
	{ USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
	{ USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
	{ USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
	{ USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
	{ USB_DEVICE(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_ID) },
65
66
67
68
69
70
	{ USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1),
		.driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
	{ USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65),
		.driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
	{ USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75),
		.driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
71
	{ USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_EF81) },
72
	{ USB_DEVICE(BENQ_VENDOR_ID, BENQ_PRODUCT_ID_S81) }, /* Benq/Siemens S81 */
73
	{ USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
74
75
	{ USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },
	{ USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) },
76
	{ USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) },
77
	{ USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) },
78
	{ USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) },
79
	{ USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) },
80
	{ USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) },
81
	{ USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID) },
82
	{ USB_DEVICE(WS002IN_VENDOR_ID, WS002IN_PRODUCT_ID) },
83
	{ USB_DEVICE(COREGA_VENDOR_ID, COREGA_PRODUCT_ID) },
84
	{ USB_DEVICE(YCCABLE_VENDOR_ID, YCCABLE_PRODUCT_ID) },
Matthew Arnold's avatar
Matthew Arnold committed
85
	{ USB_DEVICE(SUPERIAL_VENDOR_ID, SUPERIAL_PRODUCT_ID) },
86
	{ USB_DEVICE(HP_VENDOR_ID, HP_LD220_PRODUCT_ID) },
87
	{ USB_DEVICE(CRESSI_VENDOR_ID, CRESSI_EDY_PRODUCT_ID) },
88
	{ USB_DEVICE(ZEAGLE_VENDOR_ID, ZEAGLE_N2ITION3_PRODUCT_ID) },
89
	{ USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) },
90
	{ USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) },
91
	{ USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530_PRODUCT_ID) },
92
	{ USB_DEVICE(SMART_VENDOR_ID, SMART_PRODUCT_ID) },
Linus Torvalds's avatar
Linus Torvalds committed
93
94
95
	{ }					/* Terminating entry */
};

96
MODULE_DEVICE_TABLE(usb, id_table);
Linus Torvalds's avatar
Linus Torvalds committed
97
98
99
100
101
102
103
104
105
106

#define SET_LINE_REQUEST_TYPE		0x21
#define SET_LINE_REQUEST		0x20

#define SET_CONTROL_REQUEST_TYPE	0x21
#define SET_CONTROL_REQUEST		0x22
#define CONTROL_DTR			0x01
#define CONTROL_RTS			0x02

#define BREAK_REQUEST_TYPE		0x21
Alan Cox's avatar
Alan Cox committed
107
#define BREAK_REQUEST			0x23
Linus Torvalds's avatar
Linus Torvalds committed
108
109
110
111
112
113
114
115
116
117
118
119
#define BREAK_ON			0xffff
#define BREAK_OFF			0x0000

#define GET_LINE_REQUEST_TYPE		0xa1
#define GET_LINE_REQUEST		0x21

#define VENDOR_WRITE_REQUEST_TYPE	0x40
#define VENDOR_WRITE_REQUEST		0x01

#define VENDOR_READ_REQUEST_TYPE	0xc0
#define VENDOR_READ_REQUEST		0x01

120
#define UART_STATE_INDEX		8
Linus Torvalds's avatar
Linus Torvalds committed
121
122
123
124
125
126
127
128
129
130
131
132
#define UART_STATE_TRANSIENT_MASK	0x74
#define UART_DCD			0x01
#define UART_DSR			0x02
#define UART_BREAK_ERROR		0x04
#define UART_RING			0x08
#define UART_FRAME_ERROR		0x10
#define UART_PARITY_ERROR		0x20
#define UART_OVERRUN_ERROR		0x40
#define UART_CTS			0x80


enum pl2303_type {
133
134
	TYPE_01,	/* Type 0 and 1 (difference unknown) */
	TYPE_HX,	/* HX version of the pl2303 chip */
135
136
137
138
139
140
	TYPE_COUNT
};

struct pl2303_type_data {
	speed_t max_baud_rate;
	unsigned long quirks;
Linus Torvalds's avatar
Linus Torvalds committed
141
142
};

143
struct pl2303_serial_private {
144
	struct pl2303_type_data *type;
145
	unsigned long quirks;
146
147
};

Linus Torvalds's avatar
Linus Torvalds committed
148
149
150
151
struct pl2303_private {
	spinlock_t lock;
	u8 line_control;
	u8 line_status;
152
153

	u8 line_settings[7];
Linus Torvalds's avatar
Linus Torvalds committed
154
155
};

156
157
158
159
160
161
162
static struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = {
	[TYPE_01] = {
		.max_baud_rate =	1228800,
		.quirks =		PL2303_QUIRK_LEGACY,
	},
};

163
164
static int pl2303_vendor_read(struct usb_serial *serial, u16 value,
							unsigned char buf[1])
165
{
166
	struct device *dev = &serial->interface->dev;
167
168
169
	int res;

	res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
170
			VENDOR_READ_REQUEST, VENDOR_READ_REQUEST_TYPE,
171
172
173
174
175
176
177
178
179
			value, 0, buf, 1, 100);
	if (res != 1) {
		dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__,
								value, res);
		if (res >= 0)
			res = -EIO;

		return res;
	}
180

181
	dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, buf[0]);
182

183
	return 0;
184
185
}

186
static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index)
187
{
188
	struct device *dev = &serial->interface->dev;
189
190
	int res;

191
192
	dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, index);

193
	res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
194
195
			VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE,
			value, index, NULL, 0, 100);
196
197
198
199
200
	if (res) {
		dev_err(dev, "%s - failed to write [%04x]: %d\n", __func__,
								value, res);
		return res;
	}
201

202
	return 0;
203
204
}

205
206
207
208
209
210
211
212
static int pl2303_probe(struct usb_serial *serial,
					const struct usb_device_id *id)
{
	usb_set_serial_data(serial, (void *)id->driver_info);

	return 0;
}

213
static int pl2303_startup(struct usb_serial *serial)
Linus Torvalds's avatar
Linus Torvalds committed
214
{
215
	struct pl2303_serial_private *spriv;
216
	enum pl2303_type type = TYPE_01;
217
	unsigned char *buf;
218
219
220
221

	spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
	if (!spriv)
		return -ENOMEM;
Linus Torvalds's avatar
Linus Torvalds committed
222

223
	buf = kmalloc(1, GFP_KERNEL);
224
225
	if (!buf) {
		kfree(spriv);
226
		return -ENOMEM;
227
	}
228

229
	if (serial->dev->descriptor.bDeviceClass == 0x02)
230
		type = TYPE_01;		/* type 0 */
231
	else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
232
		type = TYPE_HX;
233
	else if (serial->dev->descriptor.bDeviceClass == 0x00)
234
		type = TYPE_01;		/* type 1 */
235
	else if (serial->dev->descriptor.bDeviceClass == 0xFF)
236
		type = TYPE_01;		/* type 1 */
237
	dev_dbg(&serial->interface->dev, "device type: %d\n", type);
Linus Torvalds's avatar
Linus Torvalds committed
238

239
	spriv->type = &pl2303_type_data[type];
240
	spriv->quirks = (unsigned long)usb_get_serial_data(serial);
241
	spriv->quirks |= spriv->type->quirks;
242

243
	usb_set_serial_data(serial, spriv);
244

245
246
247
248
249
250
251
252
253
254
	pl2303_vendor_read(serial, 0x8484, buf);
	pl2303_vendor_write(serial, 0x0404, 0);
	pl2303_vendor_read(serial, 0x8484, buf);
	pl2303_vendor_read(serial, 0x8383, buf);
	pl2303_vendor_read(serial, 0x8484, buf);
	pl2303_vendor_write(serial, 0x0404, 1);
	pl2303_vendor_read(serial, 0x8484, buf);
	pl2303_vendor_read(serial, 0x8383, buf);
	pl2303_vendor_write(serial, 0, 1);
	pl2303_vendor_write(serial, 1, 0);
255
	if (spriv->quirks & PL2303_QUIRK_LEGACY)
256
		pl2303_vendor_write(serial, 2, 0x24);
257
258
	else
		pl2303_vendor_write(serial, 2, 0x44);
259
260

	kfree(buf);
261

Linus Torvalds's avatar
Linus Torvalds committed
262
	return 0;
263
}
Linus Torvalds's avatar
Linus Torvalds committed
264

265
266
static void pl2303_release(struct usb_serial *serial)
{
267
	struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283

	kfree(spriv);
}

static int pl2303_port_probe(struct usb_serial_port *port)
{
	struct pl2303_private *priv;

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

	spin_lock_init(&priv->lock);

	usb_set_serial_port_data(port, priv);

284
285
	port->port.drain_delay = 256;

286
287
288
289
290
	return 0;
}

static int pl2303_port_remove(struct usb_serial_port *port)
{
291
	struct pl2303_private *priv = usb_get_serial_port_data(port);
292
293
294
295

	kfree(priv);

	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
296
297
}

298
static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value)
Linus Torvalds's avatar
Linus Torvalds committed
299
{
300
	struct usb_device *dev = port->serial->dev;
Linus Torvalds's avatar
Linus Torvalds committed
301
	int retval;
Alan Cox's avatar
Alan Cox committed
302

303
304
	dev_dbg(&port->dev, "%s - %02x\n", __func__, value);

305
306
307
	retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
				 SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
				 value, 0, NULL, 0, 100);
308
309
	if (retval)
		dev_err(&port->dev, "%s - failed: %d\n", __func__, retval);
310

Linus Torvalds's avatar
Linus Torvalds committed
311
312
313
	return retval;
}

314
315
316
317
/*
 * Returns the nearest supported baud rate.
 */
static speed_t pl2303_get_supported_baud_rate(speed_t baud)
Linus Torvalds's avatar
Linus Torvalds committed
318
{
319
320
321
322
323
	static const speed_t baud_sup[] = {
		75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600,
		14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800,
		500000, 614400, 921600, 1228800, 2457600, 3000000, 6000000
	};
Linus Torvalds's avatar
Linus Torvalds committed
324

325
	unsigned i;
326

327
328
329
330
	for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) {
		if (baud_sup[i] > baud)
			break;
	}
331

332
333
334
335
336
337
	if (i == ARRAY_SIZE(baud_sup))
		baud = baud_sup[i - 1];
	else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1]))
		baud = baud_sup[i - 1];
	else
		baud = baud_sup[i];
338

339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
	return baud;
}

static void pl2303_encode_baud_rate(struct tty_struct *tty,
					struct usb_serial_port *port,
					u8 buf[4])
{
	struct usb_serial *serial = port->serial;
	struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
	speed_t baud;

	baud = tty_get_baud_rate(tty);
	dev_dbg(&port->dev, "baud requested = %u\n", baud);
	if (!baud)
		return;
354
355
356

	if (spriv->type->max_baud_rate)
		baud = min_t(speed_t, baud, spriv->type->max_baud_rate);
357
358
359
360
361
362
363
364
	/*
	 * Set baud rate to nearest supported value.
	 *
	 * NOTE: If unsupported values are set directly, the PL2303 seems to
	 *       use 9600 baud.
	 */
	baud = pl2303_get_supported_baud_rate(baud);

365
	if (baud <= 115200) {
366
367
368
		put_unaligned_le32(baud, buf);
	} else {
		/*
369
370
		 * Apparently the formula for higher speeds is:
		 * baudrate = 12M * 32 / (2^buf[1]) / buf[0]
371
		 */
372
373
		unsigned tmp = 12000000 * 32 / baud;
		buf[3] = 0x80;
374
		buf[2] = 0;
375
376
377
378
379
380
		buf[1] = (tmp >= 256);
		while (tmp >= 256) {
			tmp >>= 2;
			buf[1] <<= 1;
		}
		buf[0] = tmp;
381
382
	}

383
	/* Save resulting baud rate */
384
	tty_encode_baud_rate(tty, baud, baud);
385
	dev_dbg(&port->dev, "baud set = %u\n", baud);
386
387
}

388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
static int pl2303_get_line_request(struct usb_serial_port *port,
							unsigned char buf[7])
{
	struct usb_device *udev = port->serial->dev;
	int ret;

	ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
				GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
				0, 0, buf, 7, 100);
	if (ret != 7) {
		dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);

		if (ret > 0)
			ret = -EIO;

		return ret;
	}

	dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);

	return 0;
}

static int pl2303_set_line_request(struct usb_serial_port *port,
							unsigned char buf[7])
{
	struct usb_device *udev = port->serial->dev;
	int ret;

	ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
				SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
				0, 0, buf, 7, 100);
	if (ret != 7) {
		dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);

		if (ret > 0)
			ret = -EIO;

		return ret;
	}

	dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);

	return 0;
}

434
435
436
437
438
439
440
441
static void pl2303_set_termios(struct tty_struct *tty,
		struct usb_serial_port *port, struct ktermios *old_termios)
{
	struct usb_serial *serial = port->serial;
	struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
	struct pl2303_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;
	unsigned char *buf;
442
	int ret;
443
444
445
446
447
448
449
450
451
452
453
454
455
	u8 control;

	if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
		return;

	buf = kzalloc(7, GFP_KERNEL);
	if (!buf) {
		/* Report back no change occurred */
		if (old_termios)
			tty->termios = *old_termios;
		return;
	}

456
	pl2303_get_line_request(port, buf);
457

458
459
460
461
462
463
464
465
466
467
468
469
470
	switch (C_CSIZE(tty)) {
	case CS5:
		buf[6] = 5;
		break;
	case CS6:
		buf[6] = 6;
		break;
	case CS7:
		buf[6] = 7;
		break;
	default:
	case CS8:
		buf[6] = 8;
471
	}
472
	dev_dbg(&port->dev, "data bits = %d\n", buf[6]);
473

474
	/* For reference buf[0]:buf[3] baud rate value */
475
	pl2303_encode_baud_rate(tty, port, &buf[0]);
476

Linus Torvalds's avatar
Linus Torvalds committed
477
478
479
	/* For reference buf[4]=0 is 1 stop bits */
	/* For reference buf[4]=1 is 1.5 stop bits */
	/* For reference buf[4]=2 is 2 stop bits */
480
481
482
	if (C_CSTOPB(tty)) {
		/*
		 * NOTE: Comply with "real" UARTs / RS232:
483
484
		 *       use 1.5 instead of 2 stop bits with 5 data bits
		 */
485
		if (C_CSIZE(tty) == CS5) {
486
			buf[4] = 1;
487
			dev_dbg(&port->dev, "stop bits = 1.5\n");
488
489
		} else {
			buf[4] = 2;
490
			dev_dbg(&port->dev, "stop bits = 2\n");
491
		}
Linus Torvalds's avatar
Linus Torvalds committed
492
493
	} else {
		buf[4] = 0;
494
		dev_dbg(&port->dev, "stop bits = 1\n");
Linus Torvalds's avatar
Linus Torvalds committed
495
496
	}

497
	if (C_PARENB(tty)) {
Linus Torvalds's avatar
Linus Torvalds committed
498
499
500
501
502
		/* For reference buf[5]=0 is none parity */
		/* For reference buf[5]=1 is odd parity */
		/* For reference buf[5]=2 is even parity */
		/* For reference buf[5]=3 is mark parity */
		/* For reference buf[5]=4 is space parity */
503
504
		if (C_PARODD(tty)) {
			if (tty->termios.c_cflag & CMSPAR) {
505
				buf[5] = 3;
506
				dev_dbg(&port->dev, "parity = mark\n");
507
508
			} else {
				buf[5] = 1;
509
				dev_dbg(&port->dev, "parity = odd\n");
510
			}
Linus Torvalds's avatar
Linus Torvalds committed
511
		} else {
512
			if (tty->termios.c_cflag & CMSPAR) {
513
				buf[5] = 4;
514
				dev_dbg(&port->dev, "parity = space\n");
515
516
			} else {
				buf[5] = 2;
517
				dev_dbg(&port->dev, "parity = even\n");
518
			}
Linus Torvalds's avatar
Linus Torvalds committed
519
520
521
		}
	} else {
		buf[5] = 0;
522
		dev_dbg(&port->dev, "parity = none\n");
Linus Torvalds's avatar
Linus Torvalds committed
523
524
	}

525
526
527
528
529
530
531
532
533
534
535
536
537
	/*
	 * Some PL2303 are known to lose bytes if you change serial settings
	 * even to the same values as before. Thus we actually need to filter
	 * in this specific case.
	 *
	 * Note that the tty_termios_hw_change check above is not sufficient
	 * as a previously requested baud rate may differ from the one
	 * actually used (and stored in old_termios).
	 *
	 * NOTE: No additional locking needed for line_settings as it is
	 *       only used in set_termios, which is serialised against itself.
	 */
	if (!old_termios || memcmp(buf, priv->line_settings, 7)) {
538
539
		ret = pl2303_set_line_request(port, buf);
		if (!ret)
540
541
			memcpy(priv->line_settings, buf, 7);
	}
Linus Torvalds's avatar
Linus Torvalds committed
542
543
544
545

	/* change control lines if we are switching to or from B0 */
	spin_lock_irqsave(&priv->lock, flags);
	control = priv->line_control;
546
	if (C_BAUD(tty) == B0)
Linus Torvalds's avatar
Linus Torvalds committed
547
		priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
548
	else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
Linus Torvalds's avatar
Linus Torvalds committed
549
550
551
552
		priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
	if (control != priv->line_control) {
		control = priv->line_control;
		spin_unlock_irqrestore(&priv->lock, flags);
553
		pl2303_set_control_lines(port, control);
Linus Torvalds's avatar
Linus Torvalds committed
554
555
556
	} else {
		spin_unlock_irqrestore(&priv->lock, flags);
	}
557

558
	if (C_CRTSCTS(tty)) {
559
		if (spriv->quirks & PL2303_QUIRK_LEGACY)
560
			pl2303_vendor_write(serial, 0x0, 0x41);
561
562
		else
			pl2303_vendor_write(serial, 0x0, 0x61);
t.sefzick's avatar
t.sefzick committed
563
	} else {
564
		pl2303_vendor_write(serial, 0x0, 0x0);
Linus Torvalds's avatar
Linus Torvalds committed
565
	}
566
567
568
569

	kfree(buf);
}

570
571
572
573
574
575
576
577
578
579
580
581
582
static void pl2303_dtr_rts(struct usb_serial_port *port, int on)
{
	struct pl2303_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;
	u8 control;

	spin_lock_irqsave(&priv->lock, flags);
	if (on)
		priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
	else
		priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
	control = priv->line_control;
	spin_unlock_irqrestore(&priv->lock, flags);
583

584
	pl2303_set_control_lines(port, control);
585
586
587
}

static void pl2303_close(struct usb_serial_port *port)
588
{
Johan Hovold's avatar
Johan Hovold committed
589
	usb_serial_generic_close(port);
590
	usb_kill_urb(port->interrupt_in_urb);
Linus Torvalds's avatar
Linus Torvalds committed
591
592
}

593
static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port)
Linus Torvalds's avatar
Linus Torvalds committed
594
595
{
	struct usb_serial *serial = port->serial;
596
	struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
Linus Torvalds's avatar
Linus Torvalds committed
597
598
	int result;

599
	if (spriv->quirks & PL2303_QUIRK_LEGACY) {
600
601
		usb_clear_halt(serial->dev, port->write_urb->pipe);
		usb_clear_halt(serial->dev, port->read_urb->pipe);
602
	} else {
Linus Torvalds's avatar
Linus Torvalds committed
603
		/* reset upstream data pipes */
604
605
		pl2303_vendor_write(serial, 8, 0);
		pl2303_vendor_write(serial, 9, 0);
Linus Torvalds's avatar
Linus Torvalds committed
606
607
608
	}

	/* Setup termios */
Alan Cox's avatar
Alan Cox committed
609
	if (tty)
610
		pl2303_set_termios(tty, port, NULL);
Linus Torvalds's avatar
Linus Torvalds committed
611

612
	result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
Linus Torvalds's avatar
Linus Torvalds committed
613
	if (result) {
614
615
		dev_err(&port->dev, "failed to submit interrupt urb: %d\n",
			result);
616
		return result;
Linus Torvalds's avatar
Linus Torvalds committed
617
	}
618

619
	result = usb_serial_generic_open(tty, port);
620
621
622
623
624
	if (result) {
		usb_kill_urb(port->interrupt_in_urb);
		return result;
	}

Linus Torvalds's avatar
Linus Torvalds committed
625
626
627
	return 0;
}

628
static int pl2303_tiocmset(struct tty_struct *tty,
629
			   unsigned int set, unsigned int clear)
Linus Torvalds's avatar
Linus Torvalds committed
630
{
Alan Cox's avatar
Alan Cox committed
631
	struct usb_serial_port *port = tty->driver_data;
Linus Torvalds's avatar
Linus Torvalds committed
632
633
634
	struct pl2303_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;
	u8 control;
635
	int ret;
636

637
	spin_lock_irqsave(&priv->lock, flags);
Linus Torvalds's avatar
Linus Torvalds committed
638
639
640
641
642
643
644
645
646
	if (set & TIOCM_RTS)
		priv->line_control |= CONTROL_RTS;
	if (set & TIOCM_DTR)
		priv->line_control |= CONTROL_DTR;
	if (clear & TIOCM_RTS)
		priv->line_control &= ~CONTROL_RTS;
	if (clear & TIOCM_DTR)
		priv->line_control &= ~CONTROL_DTR;
	control = priv->line_control;
647
	spin_unlock_irqrestore(&priv->lock, flags);
Linus Torvalds's avatar
Linus Torvalds committed
648

649
650
651
	ret = pl2303_set_control_lines(port, control);
	if (ret)
		return usb_translate_errors(ret);
652

653
	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
654
655
}

656
static int pl2303_tiocmget(struct tty_struct *tty)
Linus Torvalds's avatar
Linus Torvalds committed
657
{
Alan Cox's avatar
Alan Cox committed
658
	struct usb_serial_port *port = tty->driver_data;
Linus Torvalds's avatar
Linus Torvalds committed
659
660
661
662
663
664
	struct pl2303_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;
	unsigned int mcr;
	unsigned int status;
	unsigned int result;

665
	spin_lock_irqsave(&priv->lock, flags);
Linus Torvalds's avatar
Linus Torvalds committed
666
667
	mcr = priv->line_control;
	status = priv->line_status;
668
	spin_unlock_irqrestore(&priv->lock, flags);
Linus Torvalds's avatar
Linus Torvalds committed
669
670
671
672
673
674
675
676

	result = ((mcr & CONTROL_DTR)		? TIOCM_DTR : 0)
		  | ((mcr & CONTROL_RTS)	? TIOCM_RTS : 0)
		  | ((status & UART_CTS)	? TIOCM_CTS : 0)
		  | ((status & UART_DSR)	? TIOCM_DSR : 0)
		  | ((status & UART_RING)	? TIOCM_RI  : 0)
		  | ((status & UART_DCD)	? TIOCM_CD  : 0);

677
	dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
Linus Torvalds's avatar
Linus Torvalds committed
678
679
680
681

	return result;
}

682
683
684
static int pl2303_carrier_raised(struct usb_serial_port *port)
{
	struct pl2303_private *priv = usb_get_serial_port_data(port);
685

686
687
	if (priv->line_status & UART_DCD)
		return 1;
688

689
690
691
	return 0;
}

692
static int pl2303_tiocmiwait(struct tty_struct *tty, unsigned long arg)
Linus Torvalds's avatar
Linus Torvalds committed
693
{
694
	struct usb_serial_port *port = tty->driver_data;
Linus Torvalds's avatar
Linus Torvalds committed
695
696
697
698
699
700
	struct pl2303_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;
	unsigned int prevstatus;
	unsigned int status;
	unsigned int changed;

701
	spin_lock_irqsave(&priv->lock, flags);
Linus Torvalds's avatar
Linus Torvalds committed
702
	prevstatus = priv->line_status;
703
	spin_unlock_irqrestore(&priv->lock, flags);
Linus Torvalds's avatar
Linus Torvalds committed
704
705

	while (1) {
706
		interruptible_sleep_on(&port->port.delta_msr_wait);
Linus Torvalds's avatar
Linus Torvalds committed
707
708
709
		/* see if a signal did it */
		if (signal_pending(current))
			return -ERESTARTSYS;
710

711
712
713
		if (port->serial->disconnected)
			return -EIO;

714
		spin_lock_irqsave(&priv->lock, flags);
Linus Torvalds's avatar
Linus Torvalds committed
715
		status = priv->line_status;
716
717
		spin_unlock_irqrestore(&priv->lock, flags);

Alan Cox's avatar
Alan Cox committed
718
		changed = prevstatus ^ status;
719

Linus Torvalds's avatar
Linus Torvalds committed
720
721
722
		if (((arg & TIOCM_RNG) && (changed & UART_RING)) ||
		    ((arg & TIOCM_DSR) && (changed & UART_DSR)) ||
		    ((arg & TIOCM_CD)  && (changed & UART_DCD)) ||
Alan Cox's avatar
Alan Cox committed
723
		    ((arg & TIOCM_CTS) && (changed & UART_CTS))) {
Linus Torvalds's avatar
Linus Torvalds committed
724
725
726
727
728
729
730
731
			return 0;
		}
		prevstatus = status;
	}
	/* NOTREACHED */
	return 0;
}

732
static int pl2303_ioctl(struct tty_struct *tty,
733
			unsigned int cmd, unsigned long arg)
Linus Torvalds's avatar
Linus Torvalds committed
734
{
735
	struct serial_struct ser;
Alan Cox's avatar
Alan Cox committed
736
	struct usb_serial_port *port = tty->driver_data;
737

Linus Torvalds's avatar
Linus Torvalds committed
738
	switch (cmd) {
739
740
741
	case TIOCGSERIAL:
		memset(&ser, 0, sizeof ser);
		ser.type = PORT_16654;
742
		ser.line = port->minor;
743
		ser.port = port->port_number;
744
745
746
747
748
749
		ser.baud_base = 460800;

		if (copy_to_user((void __user *)arg, &ser, sizeof ser))
			return -EFAULT;

		return 0;
Alan Cox's avatar
Alan Cox committed
750
751
	default:
		break;
Linus Torvalds's avatar
Linus Torvalds committed
752
	}
753

Linus Torvalds's avatar
Linus Torvalds committed
754
755
756
	return -ENOIOCTLCMD;
}

Alan Cox's avatar
Alan Cox committed
757
static void pl2303_break_ctl(struct tty_struct *tty, int break_state)
Linus Torvalds's avatar
Linus Torvalds committed
758
{
Alan Cox's avatar
Alan Cox committed
759
	struct usb_serial_port *port = tty->driver_data;
Linus Torvalds's avatar
Linus Torvalds committed
760
761
762
763
764
765
766
767
	struct usb_serial *serial = port->serial;
	u16 state;
	int result;

	if (break_state == 0)
		state = BREAK_OFF;
	else
		state = BREAK_ON;
768

769
	dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
Alan Cox's avatar
Alan Cox committed
770
			state == BREAK_OFF ? "off" : "on");
Linus Torvalds's avatar
Linus Torvalds committed
771

772
773
774
	result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
				 BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
				 0, NULL, 0, 100);
Linus Torvalds's avatar
Linus Torvalds committed
775
	if (result)
776
		dev_err(&port->dev, "error sending break = %d\n", result);
Linus Torvalds's avatar
Linus Torvalds committed
777
778
}

Flavio Leitner's avatar
Flavio Leitner committed
779
780
781
782
static void pl2303_update_line_status(struct usb_serial_port *port,
				      unsigned char *data,
				      unsigned int actual_length)
{
783
784
	struct usb_serial *serial = port->serial;
	struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
Flavio Leitner's avatar
Flavio Leitner committed
785
	struct pl2303_private *priv = usb_get_serial_port_data(port);
786
	struct tty_struct *tty;
Flavio Leitner's avatar
Flavio Leitner committed
787
	unsigned long flags;
788
	unsigned int status_idx = UART_STATE_INDEX;
789
	u8 prev_line_status;
Flavio Leitner's avatar
Flavio Leitner committed
790

791
792
	if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0)
		status_idx = 0;
Flavio Leitner's avatar
Flavio Leitner committed
793

794
	if (actual_length < status_idx + 1)
795
		return;
Flavio Leitner's avatar
Flavio Leitner committed
796

Alan Cox's avatar
Alan Cox committed
797
	/* Save off the uart status for others to look at */
Flavio Leitner's avatar
Flavio Leitner committed
798
	spin_lock_irqsave(&priv->lock, flags);
799
	prev_line_status = priv->line_status;
Flavio Leitner's avatar
Flavio Leitner committed
800
801
	priv->line_status = data[status_idx];
	spin_unlock_irqrestore(&priv->lock, flags);
802

803
804
	if (priv->line_status & UART_BREAK_ERROR)
		usb_serial_handle_break(port);
805

806
	wake_up_interruptible(&port->port.delta_msr_wait);
807
808
809
810
811
812
813
814

	tty = tty_port_tty_get(&port->port);
	if (!tty)
		return;
	if ((priv->line_status ^ prev_line_status) & UART_DCD)
		usb_serial_handle_dcd_change(port, tty,
				priv->line_status & UART_DCD);
	tty_kref_put(tty);
Flavio Leitner's avatar
Flavio Leitner committed
815
}
Linus Torvalds's avatar
Linus Torvalds committed
816

817
static void pl2303_read_int_callback(struct urb *urb)
Linus Torvalds's avatar
Linus Torvalds committed
818
{
819
	struct usb_serial_port *port =  urb->context;
Linus Torvalds's avatar
Linus Torvalds committed
820
	unsigned char *data = urb->transfer_buffer;
Flavio Leitner's avatar
Flavio Leitner committed
821
	unsigned int actual_length = urb->actual_length;
822
823
	int status = urb->status;
	int retval;
Linus Torvalds's avatar
Linus Torvalds committed
824

825
	switch (status) {
Linus Torvalds's avatar
Linus Torvalds committed
826
827
828
829
830
831
832
	case 0:
		/* success */
		break;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
		/* this urb is terminated, clean up */
833
834
		dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
			__func__, status);
Linus Torvalds's avatar
Linus Torvalds committed
835
836
		return;
	default:
837
838
		dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
			__func__, status);
Linus Torvalds's avatar
Linus Torvalds committed
839
840
841
		goto exit;
	}

842
	usb_serial_debug_data(&port->dev, __func__,
843
844
			      urb->actual_length, urb->transfer_buffer);

Flavio Leitner's avatar
Flavio Leitner committed
845
	pl2303_update_line_status(port, data, actual_length);
Linus Torvalds's avatar
Linus Torvalds committed
846
847

exit:
848
	retval = usb_submit_urb(urb, GFP_ATOMIC);
849
	if (retval) {
850
		dev_err(&port->dev,
851
			"%s - usb_submit_urb failed with result %d\n",
852
			__func__, retval);
853
	}
Linus Torvalds's avatar
Linus Torvalds committed
854
855
}

856
static void pl2303_process_read_urb(struct urb *urb)
857
{
858
859
	struct usb_serial_port *port = urb->context;
	struct pl2303_private *priv = usb_get_serial_port_data(port);
860
861
	unsigned char *data = urb->transfer_buffer;
	char tty_flag = TTY_NORMAL;
862
863
864
865
866
867
868
869
870
871
872
873
874
	unsigned long flags;
	u8 line_status;
	int i;

	/* update line status */
	spin_lock_irqsave(&priv->lock, flags);
	line_status = priv->line_status;
	priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
	spin_unlock_irqrestore(&priv->lock, flags);

	if (!urb->actual_length)
		return;

875
876
877
878
	/*
	 * Break takes precedence over parity, which takes precedence over
	 * framing errors.
	 */
879
880
881
882
883
884
885
	if (line_status & UART_BREAK_ERROR)
		tty_flag = TTY_BREAK;
	else if (line_status & UART_PARITY_ERROR)
		tty_flag = TTY_PARITY;
	else if (line_status & UART_FRAME_ERROR)
		tty_flag = TTY_FRAME;

886
887
888
	if (tty_flag != TTY_NORMAL)
		dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__,
								tty_flag);
889
890
	/* overrun is special, not associated with a char */
	if (line_status & UART_OVERRUN_ERROR)
Jiri Slaby's avatar
Jiri Slaby committed
891
		tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
892

893
	if (port->port.console && port->sysrq) {
894
		for (i = 0; i < urb->actual_length; ++i)
895
			if (!usb_serial_handle_sysrq_char(port, data[i]))
Jiri Slaby's avatar
Jiri Slaby committed
896
897
				tty_insert_flip_char(&port->port, data[i],
						tty_flag);
898
	} else {
899
		tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
900
							urb->actual_length);
901
	}
Linus Torvalds's avatar
Linus Torvalds committed
902

Jiri Slaby's avatar
Jiri Slaby committed
903
	tty_flip_buffer_push(&port->port);
Linus Torvalds's avatar
Linus Torvalds committed
904
905
}

906
907
908
909
910
911
912
static struct usb_serial_driver pl2303_device = {
	.driver = {
		.owner =	THIS_MODULE,
		.name =		"pl2303",
	},
	.id_table =		id_table,
	.num_ports =		1,
913
	.bulk_in_size =		256,
914
	.bulk_out_size =	256,
915
916
	.open =			pl2303_open,
	.close =		pl2303_close,
917
	.dtr_rts =		pl2303_dtr_rts,
918
	.carrier_raised =	pl2303_carrier_raised,
919
920
921
922
923
	.ioctl =		pl2303_ioctl,
	.break_ctl =		pl2303_break_ctl,
	.set_termios =		pl2303_set_termios,
	.tiocmget =		pl2303_tiocmget,
	.tiocmset =		pl2303_tiocmset,
924
	.tiocmiwait =		pl2303_tiocmiwait,
925
	.process_read_urb =	pl2303_process_read_urb,
926
	.read_int_callback =	pl2303_read_int_callback,
927
	.probe =		pl2303_probe,
928
	.attach =		pl2303_startup,
929
	.release =		pl2303_release,
930
931
	.port_probe =		pl2303_port_probe,
	.port_remove =		pl2303_port_remove,
932
};
Linus Torvalds's avatar
Linus Torvalds committed
933

934
935
936
937
static struct usb_serial_driver * const serial_drivers[] = {
	&pl2303_device, NULL
};

938
module_usb_serial_driver(serial_drivers, id_table);
Linus Torvalds's avatar
Linus Torvalds committed
939

940
MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver");
Linus Torvalds's avatar
Linus Torvalds committed
941
MODULE_LICENSE("GPL");