summaryrefslogtreecommitdiffstats
path: root/drivers/media/usb/em28xx/em28xx-camera.c
blob: 505e0505be040caf5b90c0273409cb089ee20e19 (plain)
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
/*
   em28xx-camera.c - driver for Empia EM25xx/27xx/28xx USB video capture devices

   Copyright (C) 2009 Mauro Carvalho Chehab <mchehab@infradead.org>
   Copyright (C) 2013 Frank Schäfer <fschaefer.oss@googlemail.com>

   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
   (at your option) 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.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include <linux/i2c.h>
#include <media/soc_camera.h>
#include <media/mt9v011.h>
#include <media/v4l2-clk.h>
#include <media/v4l2-common.h>

#include "em28xx.h"


/* Possible i2c addresses of Micron sensors */
static unsigned short micron_sensor_addrs[] = {
	0xb8 >> 1,   /* MT9V111, MT9V403 */
	0xba >> 1,   /* MT9M001/011/111/112, MT9V011/012/112, MT9D011 */
	0x90 >> 1,   /* MT9V012/112, MT9D011 (alternative address) */
	I2C_CLIENT_END
};

/* Possible i2c addresses of Omnivision sensors */
static unsigned short omnivision_sensor_addrs[] = {
	0x42 >> 1,   /* OV7725, OV7670/60/48 */
	0x60 >> 1,   /* OV2640, OV9650/53/55 */
	I2C_CLIENT_END
};


static struct soc_camera_link camlink = {
	.bus_id = 0,
	.flags = 0,
	.module_name = "em28xx",
	.unbalanced_power = true,
};


/* FIXME: Should be replaced by a proper mt9m111 driver */
static int em28xx_initialize_mt9m111(struct em28xx *dev)
{
	int i;
	unsigned char regs[][3] = {
		{ 0x0d, 0x00, 0x01, },  /* reset and use defaults */
		{ 0x0d, 0x00, 0x00, },
		{ 0x0a, 0x00, 0x21, },
		{ 0x21, 0x04, 0x00, },  /* full readout speed, no row/col skipping */
	};

	for (i = 0; i < ARRAY_SIZE(regs); i++)
		i2c_master_send(&dev->i2c_client[dev->def_i2c_bus],
				&regs[i][0], 3);

	return 0;
}


/* FIXME: Should be replaced by a proper mt9m001 driver */
static int em28xx_initialize_mt9m001(struct em28xx *dev)
{
	int i;
	unsigned char regs[][3] = {
		{ 0x0d, 0x00, 0x01, },
		{ 0x0d, 0x00, 0x00, },
		{ 0x04, 0x05, 0x00, },	/* hres = 1280 */
		{ 0x03, 0x04, 0x00, },  /* vres = 1024 */
		{ 0x20, 0x11, 0x00, },
		{ 0x06, 0x00, 0x10, },
		{ 0x2b, 0x00, 0x24, },
		{ 0x2e, 0x00, 0x24, },
		{ 0x35, 0x00, 0x24, },
		{ 0x2d, 0x00, 0x20, },
		{ 0x2c, 0x00, 0x20, },
		{ 0x09, 0x0a, 0xd4, },
		{ 0x35, 0x00, 0x57, },
	};

	for (i = 0; i < ARRAY_SIZE(regs); i++)
		i2c_master_send(&dev->i2c_client[dev->def_i2c_bus],
				&regs[i][0], 3);

	return 0;
}


/*
 * Probes Micron sensors with 8 bit address and 16 bit register width
 */
static int em28xx_probe_sensor_micron(struct em28xx *dev)
{
	int ret, i;
	char *name;
	u8 reg;
	__be16 id_be;
	u16 id;

	struct i2c_client client = dev->i2c_client[dev->def_i2c_bus];

	dev->em28xx_sensor = EM28XX_NOSENSOR;
	for (i = 0; micron_sensor_addrs[i] != I2C_CLIENT_END; i++) {
		client.addr = micron_sensor_addrs[i];
		/* NOTE: i2c_smbus_read_word_data() doesn't work with BE data */
		/* Read chip ID from register 0x00 */
		reg = 0x00;
		ret = i2c_master_send(&client, &reg, 1);
		if (ret < 0) {
			if (ret != -ENXIO)
				em28xx_errdev("couldn't read from i2c device 0x%02x: error %i\n",
					      client.addr << 1, ret);
			continue;
		}
		ret = i2c_master_recv(&client, (u8 *)&id_be, 2);
		if (ret < 0) {
			em28xx_errdev("couldn't read from i2c device 0x%02x: error %i\n",
				      client.addr << 1, ret);
			continue;
		}
		id = be16_to_cpu(id_be);
		/* Read chip ID from register 0xff */
		reg = 0xff;
		ret = i2c_master_send(&client, &reg, 1);
		if (ret < 0) {
			em28xx_errdev("couldn't read from i2c device 0x%02x: error %i\n",
				      client.addr << 1, ret);
			continue;
		}
		ret = i2c_master_recv(&client, (u8 *)&id_be, 2);
		if (ret < 0) {
			em28xx_errdev("couldn't read from i2c device 0x%02x: error %i\n",
				      client.addr << 1, ret);
			continue;
		}
		/* Validate chip ID to be sure we have a Micron device */
		if (id != be16_to_cpu(id_be))
			continue;
		/* Check chip ID */
		id = be16_to_cpu(id_be);
		switch (id) {
		case 0x1222:
			name = "MT9V012"; /* MI370 */ /* 640x480 */
			break;
		case 0x1229:
			name = "MT9V112"; /* 640x480 */
			break;
		case 0x1433:
			name = "MT9M011"; /* 1280x1024 */
			break;
		case 0x143a:    /* found in the ECS G200 */
			name = "MT9M111"; /* MI1310 */ /* 1280x1024 */
			dev->em28xx_sensor = EM28XX_MT9M111;
			break;
		case 0x148c:
			name = "MT9M112"; /* MI1320 */ /* 1280x1024 */
			break;
		case 0x1511:
			name = "MT9D011"; /* MI2010 */ /* 1600x1200 */
			break;
		case 0x8232:
		case 0x8243:	/* rev B */
			name = "MT9V011"; /* MI360 */ /* 640x480 */
			dev->em28xx_sensor = EM28XX_MT9V011;
			break;
		case 0x8431:
			name = "MT9M001"; /* 1280x1024 */
			dev->em28xx_sensor = EM28XX_MT9M001;
			break;
		default:
			em28xx_info("unknown Micron sensor detected: 0x%04x\n",
				    id);
			return 0;
		}

		if (dev->em28xx_sensor == EM28XX_NOSENSOR)
			em28xx_info("unsupported sensor detected: %s\n", name);
		else
			em28xx_info("sensor %s detected\n", name);

		dev->i2c_client[dev->def_i2c_bus].addr = client.addr;
		return 0;
	}

	return -ENODEV;
}

/*
 * Probes Omnivision sensors with 8 bit address and register width
 */
static int em28xx_probe_sensor_omnivision(struct em28xx *dev)
{
	int ret, i;
	char *name;
	u8 reg;
	u16 id;
	struct i2c_client client = dev->i2c_client[dev->def_i2c_bus];

	dev->em28xx_sensor = EM28XX_NOSENSOR;
	/* NOTE: these devices have the register auto incrementation disabled
	 * by default, so we have to use single byte reads !              */
	for (i = 0; omnivision_sensor_addrs[i] != I2C_CLIENT_END; i++) {
		client.addr = omnivision_sensor_addrs[i];
		/* Read manufacturer ID from registers 0x1c-0x1d (BE) */
		reg = 0x1c;
		ret = i2c_smbus_read_byte_data(&client, reg);
		if (ret < 0) {
			if (ret != -ENXIO)
				em28xx_errdev("couldn't read from i2c device 0x%02x: error %i\n",
					      client.addr << 1, ret);
			continue;
		}
		id = ret << 8;
		reg = 0x1d;
		ret = i2c_smbus_read_byte_data(&client, reg);
		if (ret < 0) {
			em28xx_errdev("couldn't read from i2c device 0x%02x: error %i\n",
				      client.addr << 1, ret);
			continue;
		}
		id += ret;
		/* Check manufacturer ID */
		if (id != 0x7fa2)
			continue;
		/* Read product ID from registers 0x0a-0x0b (BE) */
		reg = 0x0a;
		ret = i2c_smbus_read_byte_data(&client, reg);
		if (ret < 0) {
			em28xx_errdev("couldn't read from i2c device 0x%02x: error %i\n",
				      client.addr << 1, ret);
			continue;
		}
		id = ret << 8;
		reg = 0x0b;
		ret = i2c_smbus_read_byte_data(&client, reg);
		if (ret < 0) {
			em28xx_errdev("couldn't read from i2c device 0x%02x: error %i\n",
				      client.addr << 1, ret);
			continue;
		}
		id += ret;
		/* Check product ID */
		switch (id) {
		case 0x2642:
			name = "OV2640";
			dev->em28xx_sensor = EM28XX_OV2640;
			break;
		case 0x7648:
			name = "OV7648";
			break;
		case 0x7660:
			name = "OV7660";
			break;
		case 0x7673:
			name = "OV7670";
			break;
		case 0x7720:
			name = "OV7720";
			break;
		case 0x7721:
			name = "OV7725";
			break;
		case 0x9648: /* Rev 2 */
		case 0x9649: /* Rev 3 */
			name = "OV9640";
			break;
		case 0x9650:
		case 0x9652: /* OV9653 */
			name = "OV9650";
			break;
		case 0x9656: /* Rev 4 */
		case 0x9657: /* Rev 5 */
			name = "OV9655";
			break;
		default:
			em28xx_info("unknown OmniVision sensor detected: 0x%04x\n",
				    id);
			return 0;
		}

		if (dev->em28xx_sensor == EM28XX_NOSENSOR)
			em28xx_info("unsupported sensor detected: %s\n", name);
		else
			em28xx_info("sensor %s detected\n", name);

		dev->i2c_client[dev->def_i2c_bus].addr = client.addr;
		return 0;
	}

	return -ENODEV;
}

int em28xx_detect_sensor(struct em28xx *dev)
{
	int ret;

	ret = em28xx_probe_sensor_micron(dev);

	if (dev->em28xx_sensor == EM28XX_NOSENSOR && ret < 0)
		ret = em28xx_probe_sensor_omnivision(dev);

	/*
	 * NOTE: the Windows driver also probes i2c addresses
	 *       0x22 (Samsung ?) and 0x66 (Kodak ?)
	 */

	if (dev->em28xx_sensor == EM28XX_NOSENSOR && ret < 0) {
		em28xx_info("No sensor detected\n");
		return -ENODEV;
	}

	return 0;
}

int em28xx_init_camera(struct em28xx *dev)
{
	char clk_name[V4L2_SUBDEV_NAME_SIZE];
	struct i2c_client *client = &dev->i2c_client[dev->def_i2c_bus];
	struct i2c_adapter *adap = &dev->i2c_adap[dev->def_i2c_bus];
	int ret = 0;

	v4l2_clk_name_i2c(clk_name, sizeof(clk_name),
			  i2c_adapter_id(adap), client->addr);
	dev->clk = v4l2_clk_register_fixed(clk_name, "mclk", -EINVAL);
	if (IS_ERR(dev->clk))
		return PTR_ERR(dev->clk);

	switch (dev->em28xx_sensor) {
	case EM28XX_MT9V011:
	{
		struct mt9v011_platform_data pdata;
		struct i2c_board_info mt9v011_info = {
			.type = "mt9v011",
			.addr = client->addr,
			.platform_data = &pdata,
		};

		dev->sensor_xres = 640;
		dev->sensor_yres = 480;

		/*
		 * FIXME: mt9v011 uses I2S speed as xtal clk - at least with
		 * the Silvercrest cam I have here for testing - for higher
		 * resolutions, a high clock cause horizontal artifacts, so we
		 * need to use a lower xclk frequency.
		 * Yet, it would be possible to adjust xclk depending on the
		 * desired resolution, since this affects directly the
		 * frame rate.
		 */
		dev->board.xclk = EM28XX_XCLK_FREQUENCY_4_3MHZ;
		em28xx_write_reg(dev, EM28XX_R0F_XCLK, dev->board.xclk);
		dev->sensor_xtal = 4300000;
		pdata.xtal = dev->sensor_xtal;
		if (NULL ==
		    v4l2_i2c_new_subdev_board(&dev->v4l2_dev, adap,
					      &mt9v011_info, NULL)) {
			ret = -ENODEV;
			break;
		}
		/* probably means GRGB 16 bit bayer */
		dev->vinmode = 0x0d;
		dev->vinctl = 0x00;

		break;
	}
	case EM28XX_MT9M001:
		dev->sensor_xres = 1280;
		dev->sensor_yres = 1024;

		em28xx_initialize_mt9m001(dev);

		/* probably means BGGR 16 bit bayer */
		dev->vinmode = 0x0c;
		dev->vinctl = 0x00;

		break;
	case EM28XX_MT9M111:
		dev->sensor_xres = 640;
		dev->sensor_yres = 512;

		dev->board.xclk = EM28XX_XCLK_FREQUENCY_48MHZ;
		em28xx_write_reg(dev, EM28XX_R0F_XCLK, dev->board.xclk);
		em28xx_initialize_mt9m111(dev);

		dev->vinmode = 0x0a;
		dev->vinctl = 0x00;

		break;
	case EM28XX_OV2640:
	{
		struct v4l2_subdev *subdev;
		struct i2c_board_info ov2640_info = {
			.type = "ov2640",
			.flags = I2C_CLIENT_SCCB,
			.addr = client->addr,
			.platform_data = &camlink,
		};
		struct v4l2_mbus_framefmt fmt;

		/*
		 * FIXME: sensor supports resolutions up to 1600x1200, but
		 * resolution setting/switching needs to be modified to
		 * - switch sensor output resolution (including further
		 *   configuration changes)
		 * - adjust bridge xclk
		 * - disable 16 bit (12 bit) output formats on high resolutions
		 */
		dev->sensor_xres = 640;
		dev->sensor_yres = 480;

		subdev =
		     v4l2_i2c_new_subdev_board(&dev->v4l2_dev, adap,
					       &ov2640_info, NULL);
		if (NULL == subdev) {
			ret = -ENODEV;
			break;
		}

		fmt.code = V4L2_MBUS_FMT_YUYV8_2X8;
		fmt.width = 640;
		fmt.height = 480;
		v4l2_subdev_call(subdev, video, s_mbus_fmt, &fmt);

		/* NOTE: for UXGA=1600x1200 switch to 12MHz */
		dev->board.xclk = EM28XX_XCLK_FREQUENCY_24MHZ;
		em28xx_write_reg(dev, EM28XX_R0F_XCLK, dev->board.xclk);
		dev->vinmode = 0x08;
		dev->vinctl = 0x00;

		break;
	}
	case EM28XX_NOSENSOR:
	default:
		ret = -EINVAL;
	}

	if (ret < 0) {
		v4l2_clk_unregister_fixed(dev->clk);
		dev->clk = NULL;
	}

	return ret;
}
EXPORT_SYMBOL_GPL(em28xx_init_camera);