summaryrefslogtreecommitdiffstats
path: root/drivers/media/usb/gspca/jl2005bcd.c
blob: 17c7a953564ce1dd0e29087730d49320b3883a28 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
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
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
/*
 * Jeilin JL2005B/C/D library
 *
 * Copyright (C) 2011 Theodore Kilgore <kilgota@auburn.edu>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 */

#define MODULE_NAME "jl2005bcd"

#include <linux/workqueue.h>
#include <linux/slab.h>
#include "gspca.h"


MODULE_AUTHOR("Theodore Kilgore <kilgota@auburn.edu>");
MODULE_DESCRIPTION("JL2005B/C/D USB Camera Driver");
MODULE_LICENSE("GPL");

/* Default timeouts, in ms */
#define JL2005C_CMD_TIMEOUT 500
#define JL2005C_DATA_TIMEOUT 1000

/* Maximum transfer size to use. */
#define JL2005C_MAX_TRANSFER 0x200
#define FRAME_HEADER_LEN 16


/* specific webcam descriptor */
struct sd {
	struct gspca_dev gspca_dev;  /* !! must be the first item */
	unsigned char firmware_id[6];
	const struct v4l2_pix_format *cap_mode;
	/* Driver stuff */
	struct work_struct work_struct;
	u8 frame_brightness;
	int block_size;	/* block size of camera */
	int vga;	/* 1 if vga cam, 0 if cif cam */
};


/* Camera has two resolution settings. What they are depends on model. */
static const struct v4l2_pix_format cif_mode[] = {
	{176, 144, V4L2_PIX_FMT_JL2005BCD, V4L2_FIELD_NONE,
		.bytesperline = 176,
		.sizeimage = 176 * 144,
		.colorspace = V4L2_COLORSPACE_SRGB,
		.priv = 0},
	{352, 288, V4L2_PIX_FMT_JL2005BCD, V4L2_FIELD_NONE,
		.bytesperline = 352,
		.sizeimage = 352 * 288,
		.colorspace = V4L2_COLORSPACE_SRGB,
		.priv = 0},
};

static const struct v4l2_pix_format vga_mode[] = {
	{320, 240, V4L2_PIX_FMT_JL2005BCD, V4L2_FIELD_NONE,
		.bytesperline = 320,
		.sizeimage = 320 * 240,
		.colorspace = V4L2_COLORSPACE_SRGB,
		.priv = 0},
	{640, 480, V4L2_PIX_FMT_JL2005BCD, V4L2_FIELD_NONE,
		.bytesperline = 640,
		.sizeimage = 640 * 480,
		.colorspace = V4L2_COLORSPACE_SRGB,
		.priv = 0},
};

/*
 * cam uses endpoint 0x03 to send commands, 0x84 for read commands,
 * and 0x82 for bulk data transfer.
 */

/* All commands are two bytes only */
static int jl2005c_write2(struct gspca_dev *gspca_dev, unsigned char *command)
{
	int retval;

	memcpy(gspca_dev->usb_buf, command, 2);
	retval = usb_bulk_msg(gspca_dev->dev,
			usb_sndbulkpipe(gspca_dev->dev, 3),
			gspca_dev->usb_buf, 2, NULL, 500);
	if (retval < 0)
		pr_err("command write [%02x] error %d\n",
		       gspca_dev->usb_buf[0], retval);
	return retval;
}

/* Response to a command is one byte in usb_buf[0], only if requested. */
static int jl2005c_read1(struct gspca_dev *gspca_dev)
{
	int retval;

	retval = usb_bulk_msg(gspca_dev->dev,
				usb_rcvbulkpipe(gspca_dev->dev, 0x84),
				gspca_dev->usb_buf, 1, NULL, 500);
	if (retval < 0)
		pr_err("read command [0x%02x] error %d\n",
		       gspca_dev->usb_buf[0], retval);
	return retval;
}

/* Response appears in gspca_dev->usb_buf[0] */
static int jl2005c_read_reg(struct gspca_dev *gspca_dev, unsigned char reg)
{
	int retval;

	static u8 instruction[2] = {0x95, 0x00};
	/* put register to read in byte 1 */
	instruction[1] = reg;
	/* Send the read request */
	retval = jl2005c_write2(gspca_dev, instruction);
	if (retval < 0)
		return retval;
	retval = jl2005c_read1(gspca_dev);

	return retval;
}

static int jl2005c_start_new_frame(struct gspca_dev *gspca_dev)
{
	int i;
	int retval;
	int frame_brightness = 0;

	static u8 instruction[2] = {0x7f, 0x01};

	retval = jl2005c_write2(gspca_dev, instruction);
	if (retval < 0)
		return retval;

	i = 0;
	while (i < 20 && !frame_brightness) {
		/* If we tried 20 times, give up. */
		retval = jl2005c_read_reg(gspca_dev, 0x7e);
		if (retval < 0)
			return retval;
		frame_brightness = gspca_dev->usb_buf[0];
		retval = jl2005c_read_reg(gspca_dev, 0x7d);
		if (retval < 0)
			return retval;
		i++;
	}
	PDEBUG(D_FRAM, "frame_brightness is 0x%02x", gspca_dev->usb_buf[0]);
	return retval;
}

static int jl2005c_write_reg(struct gspca_dev *gspca_dev, unsigned char reg,
						    unsigned char value)
{
	int retval;
	u8 instruction[2];

	instruction[0] = reg;
	instruction[1] = value;

	retval = jl2005c_write2(gspca_dev, instruction);
	if (retval < 0)
			return retval;

	return retval;
}

static int jl2005c_get_firmware_id(struct gspca_dev *gspca_dev)
{
	struct sd *sd = (struct sd *)gspca_dev;
	int i = 0;
	int retval = -1;
	unsigned char regs_to_read[] = {0x57, 0x02, 0x03, 0x5d, 0x5e, 0x5f};

	PDEBUG(D_PROBE, "Running jl2005c_get_firmware_id");
	/* Read the first ID byte once for warmup */
	retval = jl2005c_read_reg(gspca_dev, regs_to_read[0]);
	PDEBUG(D_PROBE, "response is %02x", gspca_dev->usb_buf[0]);
	if (retval < 0)
		return retval;
	/* Now actually get the ID string */
	for (i = 0; i < 6; i++) {
		retval = jl2005c_read_reg(gspca_dev, regs_to_read[i]);
		if (retval < 0)
			return retval;
		sd->firmware_id[i] = gspca_dev->usb_buf[0];
	}
	PDEBUG(D_PROBE, "firmware ID is %02x%02x%02x%02x%02x%02x",
						sd->firmware_id[0],
						sd->firmware_id[1],
						sd->firmware_id[2],
						sd->firmware_id[3],
						sd->firmware_id[4],
						sd->firmware_id[5]);
	return 0;
}

static int jl2005c_stream_start_vga_lg
		    (struct gspca_dev *gspca_dev)
{
	int i;
	int retval = -1;
	static u8 instruction[][2] = {
		{0x05, 0x00},
		{0x7c, 0x00},
		{0x7d, 0x18},
		{0x02, 0x00},
		{0x01, 0x00},
		{0x04, 0x52},
	};

	for (i = 0; i < ARRAY_SIZE(instruction); i++) {
		msleep(60);
		retval = jl2005c_write2(gspca_dev, instruction[i]);
		if (retval < 0)
			return retval;
	}
	msleep(60);
	return retval;
}

static int jl2005c_stream_start_vga_small(struct gspca_dev *gspca_dev)
{
	int i;
	int retval = -1;
	static u8 instruction[][2] = {
		{0x06, 0x00},
		{0x7c, 0x00},
		{0x7d, 0x1a},
		{0x02, 0x00},
		{0x01, 0x00},
		{0x04, 0x52},
	};

	for (i = 0; i < ARRAY_SIZE(instruction); i++) {
		msleep(60);
		retval = jl2005c_write2(gspca_dev, instruction[i]);
		if (retval < 0)
			return retval;
	}
	msleep(60);
	return retval;
}

static int jl2005c_stream_start_cif_lg(struct gspca_dev *gspca_dev)
{
	int i;
	int retval = -1;
	static u8 instruction[][2] = {
		{0x05, 0x00},
		{0x7c, 0x00},
		{0x7d, 0x30},
		{0x02, 0x00},
		{0x01, 0x00},
		{0x04, 0x42},
	};

	for (i = 0; i < ARRAY_SIZE(instruction); i++) {
		msleep(60);
		retval = jl2005c_write2(gspca_dev, instruction[i]);
		if (retval < 0)
			return retval;
	}
	msleep(60);
	return retval;
}

static int jl2005c_stream_start_cif_small(struct gspca_dev *gspca_dev)
{
	int i;
	int retval = -1;
	static u8 instruction[][2] = {
		{0x06, 0x00},
		{0x7c, 0x00},
		{0x7d, 0x32},
		{0x02, 0x00},
		{0x01, 0x00},
		{0x04, 0x42},
	};

	for (i = 0; i < ARRAY_SIZE(instruction); i++) {
		msleep(60);
		retval = jl2005c_write2(gspca_dev, instruction[i]);
		if (retval < 0)
			return retval;
	}
	msleep(60);
	return retval;
}


static int jl2005c_stop(struct gspca_dev *gspca_dev)
{
	return jl2005c_write_reg(gspca_dev, 0x07, 0x00);
}

/*
 * This function is called as a workqueue function and runs whenever the camera
 * is streaming data. Because it is a workqueue function it is allowed to sleep
 * so we can use synchronous USB calls. To avoid possible collisions with other
 * threads attempting to use gspca_dev->usb_buf we take the usb_lock when
 * performing USB operations using it. In practice we don't really need this
 * as the camera doesn't provide any controls.
 */
static void jl2005c_dostream(struct work_struct *work)
{
	struct sd *dev = container_of(work, struct sd, work_struct);
	struct gspca_dev *gspca_dev = &dev->gspca_dev;
	int bytes_left = 0; /* bytes remaining in current frame. */
	int data_len;   /* size to use for the next read. */
	int header_read = 0;
	unsigned char header_sig[2] = {0x4a, 0x4c};
	int act_len;
	int packet_type;
	int ret;
	u8 *buffer;

	buffer = kmalloc(JL2005C_MAX_TRANSFER, GFP_KERNEL | GFP_DMA);
	if (!buffer) {
		pr_err("Couldn't allocate USB buffer\n");
		goto quit_stream;
	}

	while (gspca_dev->present && gspca_dev->streaming) {
#ifdef CONFIG_PM
		if (gspca_dev->frozen)
			break;
#endif
		/* Check if this is a new frame. If so, start the frame first */
		if (!header_read) {
			mutex_lock(&gspca_dev->usb_lock);
			ret = jl2005c_start_new_frame(gspca_dev);
			mutex_unlock(&gspca_dev->usb_lock);
			if (ret < 0)
				goto quit_stream;
			ret = usb_bulk_msg(gspca_dev->dev,
				usb_rcvbulkpipe(gspca_dev->dev, 0x82),
				buffer, JL2005C_MAX_TRANSFER, &act_len,
				JL2005C_DATA_TIMEOUT);
			PDEBUG(D_PACK,
				"Got %d bytes out of %d for header",
					act_len, JL2005C_MAX_TRANSFER);
			if (ret < 0 || act_len < JL2005C_MAX_TRANSFER)
				goto quit_stream;
			/* Check whether we actually got the first blodk */
			if (memcmp(header_sig, buffer, 2) != 0) {
				pr_err("First block is not the first block\n");
				goto quit_stream;
			}
			/* total size to fetch is byte 7, times blocksize
			 * of which we already got act_len */
			bytes_left = buffer[0x07] * dev->block_size - act_len;
			PDEBUG(D_PACK, "bytes_left = 0x%x", bytes_left);
			/* We keep the header. It has other information, too.*/
			packet_type = FIRST_PACKET;
			gspca_frame_add(gspca_dev, packet_type,
					buffer, act_len);
			header_read = 1;
		}
		while (bytes_left > 0 && gspca_dev->present) {
			data_len = bytes_left > JL2005C_MAX_TRANSFER ?
				JL2005C_MAX_TRANSFER : bytes_left;
			ret = usb_bulk_msg(gspca_dev->dev,
				usb_rcvbulkpipe(gspca_dev->dev, 0x82),
				buffer, data_len, &act_len,
				JL2005C_DATA_TIMEOUT);
			if (ret < 0 || act_len < data_len)
				goto quit_stream;
			PDEBUG(D_PACK,
				"Got %d bytes out of %d for frame",
						data_len, bytes_left);
			bytes_left -= data_len;
			if (bytes_left == 0) {
				packet_type = LAST_PACKET;
				header_read = 0;
			} else
				packet_type = INTER_PACKET;
			gspca_frame_add(gspca_dev, packet_type,
					buffer, data_len);
		}
	}
quit_stream:
	if (gspca_dev->present) {
		mutex_lock(&gspca_dev->usb_lock);
		jl2005c_stop(gspca_dev);
		mutex_unlock(&gspca_dev->usb_lock);
	}
	kfree(buffer);
}




/* This function is called at probe time */
static int sd_config(struct gspca_dev *gspca_dev,
			const struct usb_device_id *id)
{
	struct cam *cam;
	struct sd *sd = (struct sd *) gspca_dev;

	cam = &gspca_dev->cam;
	/* We don't use the buffer gspca allocates so make it small. */
	cam->bulk_size = 64;
	cam->bulk = 1;
	/* For the rest, the camera needs to be detected */
	jl2005c_get_firmware_id(gspca_dev);
	/* Here are some known firmware IDs
	 * First some JL2005B cameras
	 * {0x41, 0x07, 0x04, 0x2c, 0xe8, 0xf2}	Sakar KidzCam
	 * {0x45, 0x02, 0x08, 0xb9, 0x00, 0xd2}	No-name JL2005B
	 * JL2005C cameras
	 * {0x01, 0x0c, 0x16, 0x10, 0xf8, 0xc8}	Argus DC-1512
	 * {0x12, 0x04, 0x03, 0xc0, 0x00, 0xd8}	ICarly
	 * {0x86, 0x08, 0x05, 0x02, 0x00, 0xd4}	Jazz
	 *
	 * Based upon this scanty evidence, we can detect a CIF camera by
	 * testing byte 0 for 0x4x.
	 */
	if ((sd->firmware_id[0] & 0xf0) == 0x40) {
		cam->cam_mode	= cif_mode;
		cam->nmodes	= ARRAY_SIZE(cif_mode);
		sd->block_size	= 0x80;
	} else {
		cam->cam_mode	= vga_mode;
		cam->nmodes	= ARRAY_SIZE(vga_mode);
		sd->block_size	= 0x200;
	}

	INIT_WORK(&sd->work_struct, jl2005c_dostream);

	return 0;
}

/* this function is called at probe and resume time */
static int sd_init(struct gspca_dev *gspca_dev)
{
	return 0;
}

static int sd_start(struct gspca_dev *gspca_dev)
{

	struct sd *sd = (struct sd *) gspca_dev;
	sd->cap_mode = gspca_dev->cam.cam_mode;

	switch (gspca_dev->pixfmt.width) {
	case 640:
		PDEBUG(D_STREAM, "Start streaming at vga resolution");
		jl2005c_stream_start_vga_lg(gspca_dev);
		break;
	case 320:
		PDEBUG(D_STREAM, "Start streaming at qvga resolution");
		jl2005c_stream_start_vga_small(gspca_dev);
		break;
	case 352:
		PDEBUG(D_STREAM, "Start streaming at cif resolution");
		jl2005c_stream_start_cif_lg(gspca_dev);
		break;
	case 176:
		PDEBUG(D_STREAM, "Start streaming at qcif resolution");
		jl2005c_stream_start_cif_small(gspca_dev);
		break;
	default:
		pr_err("Unknown resolution specified\n");
		return -1;
	}

	schedule_work(&sd->work_struct);

	return 0;
}

/* called on streamoff with alt==0 and on disconnect */
/* the usb_lock is held at entry - restore on exit */
static void sd_stop0(struct gspca_dev *gspca_dev)
{
	struct sd *dev = (struct sd *) gspca_dev;

	/* wait for the work queue to terminate */
	mutex_unlock(&gspca_dev->usb_lock);
	/* This waits for sq905c_dostream to finish */
	flush_work(&dev->work_struct);
	mutex_lock(&gspca_dev->usb_lock);
}



/* sub-driver description */
static const struct sd_desc sd_desc = {
	.name = MODULE_NAME,
	.config = sd_config,
	.init = sd_init,
	.start = sd_start,
	.stop0 = sd_stop0,
};

/* -- module initialisation -- */
static const struct usb_device_id device_table[] = {
	{USB_DEVICE(0x0979, 0x0227)},
	{}
};
MODULE_DEVICE_TABLE(usb, device_table);

/* -- device connect -- */
static int sd_probe(struct usb_interface *intf,
				const struct usb_device_id *id)
{
	return gspca_dev_probe(intf, id, &sd_desc, sizeof(struct sd),
				THIS_MODULE);
}

static struct usb_driver sd_driver = {
	.name = MODULE_NAME,
	.id_table = device_table,
	.probe = sd_probe,
	.disconnect = gspca_disconnect,
#ifdef CONFIG_PM
	.suspend = gspca_suspend,
	.resume = gspca_resume,
	.reset_resume = gspca_resume,
#endif
};

module_usb_driver(sd_driver);