Free Electrons

Embedded Linux Experts

  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
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
/*
 * mt9v011 -Micron 1/4-Inch VGA Digital Image Sensor
 *
 * Copyright (c) 2009 Mauro Carvalho Chehab
 * This code is placed under the terms of the GNU General Public License v2
 */

#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/videodev2.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <asm/div64.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ctrls.h>
#include <media/i2c/mt9v011.h>

MODULE_DESCRIPTION("Micron mt9v011 sensor driver");
MODULE_AUTHOR("Mauro Carvalho Chehab");
MODULE_LICENSE("GPL");

static int debug;
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "Debug level (0-2)");

#define R00_MT9V011_CHIP_VERSION	0x00
#define R01_MT9V011_ROWSTART		0x01
#define R02_MT9V011_COLSTART		0x02
#define R03_MT9V011_HEIGHT		0x03
#define R04_MT9V011_WIDTH		0x04
#define R05_MT9V011_HBLANK		0x05
#define R06_MT9V011_VBLANK		0x06
#define R07_MT9V011_OUT_CTRL		0x07
#define R09_MT9V011_SHUTTER_WIDTH	0x09
#define R0A_MT9V011_CLK_SPEED		0x0a
#define R0B_MT9V011_RESTART		0x0b
#define R0C_MT9V011_SHUTTER_DELAY	0x0c
#define R0D_MT9V011_RESET		0x0d
#define R1E_MT9V011_DIGITAL_ZOOM	0x1e
#define R20_MT9V011_READ_MODE		0x20
#define R2B_MT9V011_GREEN_1_GAIN	0x2b
#define R2C_MT9V011_BLUE_GAIN		0x2c
#define R2D_MT9V011_RED_GAIN		0x2d
#define R2E_MT9V011_GREEN_2_GAIN	0x2e
#define R35_MT9V011_GLOBAL_GAIN		0x35
#define RF1_MT9V011_CHIP_ENABLE		0xf1

#define MT9V011_VERSION			0x8232
#define MT9V011_REV_B_VERSION		0x8243

struct mt9v011 {
	struct v4l2_subdev sd;
#ifdef CONFIG_MEDIA_CONTROLLER
	struct media_pad pad;
#endif
	struct v4l2_ctrl_handler ctrls;
	unsigned width, height;
	unsigned xtal;
	unsigned hflip:1;
	unsigned vflip:1;

	u16 global_gain, exposure;
	s16 red_bal, blue_bal;
};

static inline struct mt9v011 *to_mt9v011(struct v4l2_subdev *sd)
{
	return container_of(sd, struct mt9v011, sd);
}

static int mt9v011_read(struct v4l2_subdev *sd, unsigned char addr)
{
	struct i2c_client *c = v4l2_get_subdevdata(sd);
	__be16 buffer;
	int rc, val;

	rc = i2c_master_send(c, &addr, 1);
	if (rc != 1)
		v4l2_dbg(0, debug, sd,
			 "i2c i/o error: rc == %d (should be 1)\n", rc);

	msleep(10);

	rc = i2c_master_recv(c, (char *)&buffer, 2);
	if (rc != 2)
		v4l2_dbg(0, debug, sd,
			 "i2c i/o error: rc == %d (should be 2)\n", rc);

	val = be16_to_cpu(buffer);

	v4l2_dbg(2, debug, sd, "mt9v011: read 0x%02x = 0x%04x\n", addr, val);

	return val;
}

static void mt9v011_write(struct v4l2_subdev *sd, unsigned char addr,
				 u16 value)
{
	struct i2c_client *c = v4l2_get_subdevdata(sd);
	unsigned char buffer[3];
	int rc;

	buffer[0] = addr;
	buffer[1] = value >> 8;
	buffer[2] = value & 0xff;

	v4l2_dbg(2, debug, sd,
		 "mt9v011: writing 0x%02x 0x%04x\n", buffer[0], value);
	rc = i2c_master_send(c, buffer, 3);
	if (rc != 3)
		v4l2_dbg(0, debug, sd,
			 "i2c i/o error: rc == %d (should be 3)\n", rc);
}


struct i2c_reg_value {
	unsigned char reg;
	u16           value;
};

/*
 * Values used at the original driver
 * Some values are marked as Reserved at the datasheet
 */
static const struct i2c_reg_value mt9v011_init_default[] = {
		{ R0D_MT9V011_RESET, 0x0001 },
		{ R0D_MT9V011_RESET, 0x0000 },

		{ R0C_MT9V011_SHUTTER_DELAY, 0x0000 },
		{ R09_MT9V011_SHUTTER_WIDTH, 0x1fc },

		{ R0A_MT9V011_CLK_SPEED, 0x0000 },
		{ R1E_MT9V011_DIGITAL_ZOOM,  0x0000 },

		{ R07_MT9V011_OUT_CTRL, 0x0002 },	/* chip enable */
};


static u16 calc_mt9v011_gain(s16 lineargain)
{

	u16 digitalgain = 0;
	u16 analogmult = 0;
	u16 analoginit = 0;

	if (lineargain < 0)
		lineargain = 0;

	/* recommended minimum */
	lineargain += 0x0020;

	if (lineargain > 2047)
		lineargain = 2047;

	if (lineargain > 1023) {
		digitalgain = 3;
		analogmult = 3;
		analoginit = lineargain / 16;
	} else if (lineargain > 511) {
		digitalgain = 1;
		analogmult = 3;
		analoginit = lineargain / 8;
	} else if (lineargain > 255) {
		analogmult = 3;
		analoginit = lineargain / 4;
	} else if (lineargain > 127) {
		analogmult = 1;
		analoginit = lineargain / 2;
	} else
		analoginit = lineargain;

	return analoginit + (analogmult << 7) + (digitalgain << 9);

}

static void set_balance(struct v4l2_subdev *sd)
{
	struct mt9v011 *core = to_mt9v011(sd);
	u16 green_gain, blue_gain, red_gain;
	u16 exposure;
	s16 bal;

	exposure = core->exposure;

	green_gain = calc_mt9v011_gain(core->global_gain);

	bal = core->global_gain;
	bal += (core->blue_bal * core->global_gain / (1 << 7));
	blue_gain = calc_mt9v011_gain(bal);

	bal = core->global_gain;
	bal += (core->red_bal * core->global_gain / (1 << 7));
	red_gain = calc_mt9v011_gain(bal);

	mt9v011_write(sd, R2B_MT9V011_GREEN_1_GAIN, green_gain);
	mt9v011_write(sd, R2E_MT9V011_GREEN_2_GAIN, green_gain);
	mt9v011_write(sd, R2C_MT9V011_BLUE_GAIN, blue_gain);
	mt9v011_write(sd, R2D_MT9V011_RED_GAIN, red_gain);
	mt9v011_write(sd, R09_MT9V011_SHUTTER_WIDTH, exposure);
}

static void calc_fps(struct v4l2_subdev *sd, u32 *numerator, u32 *denominator)
{
	struct mt9v011 *core = to_mt9v011(sd);
	unsigned height, width, hblank, vblank, speed;
	unsigned row_time, t_time;
	u64 frames_per_ms;
	unsigned tmp;

	height = mt9v011_read(sd, R03_MT9V011_HEIGHT);
	width = mt9v011_read(sd, R04_MT9V011_WIDTH);
	hblank = mt9v011_read(sd, R05_MT9V011_HBLANK);
	vblank = mt9v011_read(sd, R06_MT9V011_VBLANK);
	speed = mt9v011_read(sd, R0A_MT9V011_CLK_SPEED);

	row_time = (width + 113 + hblank) * (speed + 2);
	t_time = row_time * (height + vblank + 1);

	frames_per_ms = core->xtal * 1000l;
	do_div(frames_per_ms, t_time);
	tmp = frames_per_ms;

	v4l2_dbg(1, debug, sd, "Programmed to %u.%03u fps (%d pixel clcks)\n",
		tmp / 1000, tmp % 1000, t_time);

	if (numerator && denominator) {
		*numerator = 1000;
		*denominator = (u32)frames_per_ms;
	}
}

static u16 calc_speed(struct v4l2_subdev *sd, u32 numerator, u32 denominator)
{
	struct mt9v011 *core = to_mt9v011(sd);
	unsigned height, width, hblank, vblank;
	unsigned row_time, line_time;
	u64 t_time, speed;

	/* Avoid bogus calculus */
	if (!numerator || !denominator)
		return 0;

	height = mt9v011_read(sd, R03_MT9V011_HEIGHT);
	width = mt9v011_read(sd, R04_MT9V011_WIDTH);
	hblank = mt9v011_read(sd, R05_MT9V011_HBLANK);
	vblank = mt9v011_read(sd, R06_MT9V011_VBLANK);

	row_time = width + 113 + hblank;
	line_time = height + vblank + 1;

	t_time = core->xtal * ((u64)numerator);
	/* round to the closest value */
	t_time += denominator / 2;
	do_div(t_time, denominator);

	speed = t_time;
	do_div(speed, row_time * line_time);

	/* Avoid having a negative value for speed */
	if (speed < 2)
		speed = 0;
	else
		speed -= 2;

	/* Avoid speed overflow */
	if (speed > 15)
		return 15;

	return (u16)speed;
}

static void set_res(struct v4l2_subdev *sd)
{
	struct mt9v011 *core = to_mt9v011(sd);
	unsigned vstart, hstart;

	/*
	 * The mt9v011 doesn't have scaling. So, in order to select the desired
	 * resolution, we're cropping at the middle of the sensor.
	 * hblank and vblank should be adjusted, in order to warrant that
	 * we'll preserve the line timings for 30 fps, no matter what resolution
	 * is selected.
	 * NOTE: datasheet says that width (and height) should be filled with
	 * width-1. However, this doesn't work, since one pixel per line will
	 * be missing.
	 */

	hstart = 20 + (640 - core->width) / 2;
	mt9v011_write(sd, R02_MT9V011_COLSTART, hstart);
	mt9v011_write(sd, R04_MT9V011_WIDTH, core->width);
	mt9v011_write(sd, R05_MT9V011_HBLANK, 771 - core->width);

	vstart = 8 + (480 - core->height) / 2;
	mt9v011_write(sd, R01_MT9V011_ROWSTART, vstart);
	mt9v011_write(sd, R03_MT9V011_HEIGHT, core->height);
	mt9v011_write(sd, R06_MT9V011_VBLANK, 508 - core->height);

	calc_fps(sd, NULL, NULL);
};

static void set_read_mode(struct v4l2_subdev *sd)
{
	struct mt9v011 *core = to_mt9v011(sd);
	unsigned mode = 0x1000;

	if (core->hflip)
		mode |= 0x4000;

	if (core->vflip)
		mode |= 0x8000;

	mt9v011_write(sd, R20_MT9V011_READ_MODE, mode);
}

static int mt9v011_reset(struct v4l2_subdev *sd, u32 val)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(mt9v011_init_default); i++)
		mt9v011_write(sd, mt9v011_init_default[i].reg,
			       mt9v011_init_default[i].value);

	set_balance(sd);
	set_res(sd);
	set_read_mode(sd);

	return 0;
}

static int mt9v011_enum_mbus_code(struct v4l2_subdev *sd,
		struct v4l2_subdev_pad_config *cfg,
		struct v4l2_subdev_mbus_code_enum *code)
{
	if (code->pad || code->index > 0)
		return -EINVAL;

	code->code = MEDIA_BUS_FMT_SGRBG8_1X8;
	return 0;
}

static int mt9v011_set_fmt(struct v4l2_subdev *sd,
		struct v4l2_subdev_pad_config *cfg,
		struct v4l2_subdev_format *format)
{
	struct v4l2_mbus_framefmt *fmt = &format->format;
	struct mt9v011 *core = to_mt9v011(sd);

	if (format->pad || fmt->code != MEDIA_BUS_FMT_SGRBG8_1X8)
		return -EINVAL;

	v4l_bound_align_image(&fmt->width, 48, 639, 1,
			      &fmt->height, 32, 480, 1, 0);
	fmt->field = V4L2_FIELD_NONE;
	fmt->colorspace = V4L2_COLORSPACE_SRGB;

	if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
		core->width = fmt->width;
		core->height = fmt->height;

		set_res(sd);
	} else {
		cfg->try_fmt = *fmt;
	}

	return 0;
}

static int mt9v011_g_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
{
	struct v4l2_captureparm *cp = &parms->parm.capture;

	if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
		return -EINVAL;

	memset(cp, 0, sizeof(struct v4l2_captureparm));
	cp->capability = V4L2_CAP_TIMEPERFRAME;
	calc_fps(sd,
		 &cp->timeperframe.numerator,
		 &cp->timeperframe.denominator);

	return 0;
}

static int mt9v011_s_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
{
	struct v4l2_captureparm *cp = &parms->parm.capture;
	struct v4l2_fract *tpf = &cp->timeperframe;
	u16 speed;

	if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
		return -EINVAL;
	if (cp->extendedmode != 0)
		return -EINVAL;

	speed = calc_speed(sd, tpf->numerator, tpf->denominator);

	mt9v011_write(sd, R0A_MT9V011_CLK_SPEED, speed);
	v4l2_dbg(1, debug, sd, "Setting speed to %d\n", speed);

	/* Recalculate and update fps info */
	calc_fps(sd, &tpf->numerator, &tpf->denominator);

	return 0;
}

#ifdef CONFIG_VIDEO_ADV_DEBUG
static int mt9v011_g_register(struct v4l2_subdev *sd,
			      struct v4l2_dbg_register *reg)
{
	reg->val = mt9v011_read(sd, reg->reg & 0xff);
	reg->size = 2;

	return 0;
}

static int mt9v011_s_register(struct v4l2_subdev *sd,
			      const struct v4l2_dbg_register *reg)
{
	mt9v011_write(sd, reg->reg & 0xff, reg->val & 0xffff);

	return 0;
}
#endif

static int mt9v011_s_ctrl(struct v4l2_ctrl *ctrl)
{
	struct mt9v011 *core =
		container_of(ctrl->handler, struct mt9v011, ctrls);
	struct v4l2_subdev *sd = &core->sd;

	switch (ctrl->id) {
	case V4L2_CID_GAIN:
		core->global_gain = ctrl->val;
		break;
	case V4L2_CID_EXPOSURE:
		core->exposure = ctrl->val;
		break;
	case V4L2_CID_RED_BALANCE:
		core->red_bal = ctrl->val;
		break;
	case V4L2_CID_BLUE_BALANCE:
		core->blue_bal = ctrl->val;
		break;
	case V4L2_CID_HFLIP:
		core->hflip = ctrl->val;
		set_read_mode(sd);
		return 0;
	case V4L2_CID_VFLIP:
		core->vflip = ctrl->val;
		set_read_mode(sd);
		return 0;
	default:
		return -EINVAL;
	}

	set_balance(sd);
	return 0;
}

static const struct v4l2_ctrl_ops mt9v011_ctrl_ops = {
	.s_ctrl = mt9v011_s_ctrl,
};

static const struct v4l2_subdev_core_ops mt9v011_core_ops = {
	.reset = mt9v011_reset,
#ifdef CONFIG_VIDEO_ADV_DEBUG
	.g_register = mt9v011_g_register,
	.s_register = mt9v011_s_register,
#endif
};

static const struct v4l2_subdev_video_ops mt9v011_video_ops = {
	.g_parm = mt9v011_g_parm,
	.s_parm = mt9v011_s_parm,
};

static const struct v4l2_subdev_pad_ops mt9v011_pad_ops = {
	.enum_mbus_code = mt9v011_enum_mbus_code,
	.set_fmt = mt9v011_set_fmt,
};

static const struct v4l2_subdev_ops mt9v011_ops = {
	.core  = &mt9v011_core_ops,
	.video = &mt9v011_video_ops,
	.pad   = &mt9v011_pad_ops,
};


/****************************************************************************
			I2C Client & Driver
 ****************************************************************************/

static int mt9v011_probe(struct i2c_client *c,
			 const struct i2c_device_id *id)
{
	u16 version;
	struct mt9v011 *core;
	struct v4l2_subdev *sd;
#ifdef CONFIG_MEDIA_CONTROLLER
	int ret;
#endif

	/* Check if the adapter supports the needed features */
	if (!i2c_check_functionality(c->adapter,
	     I2C_FUNC_SMBUS_READ_BYTE | I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
		return -EIO;

	core = devm_kzalloc(&c->dev, sizeof(struct mt9v011), GFP_KERNEL);
	if (!core)
		return -ENOMEM;

	sd = &core->sd;
	v4l2_i2c_subdev_init(sd, c, &mt9v011_ops);

#ifdef CONFIG_MEDIA_CONTROLLER
	core->pad.flags = MEDIA_PAD_FL_SOURCE;
	sd->entity.function = MEDIA_ENT_F_CAM_SENSOR;

	ret = media_entity_pads_init(&sd->entity, 1, &core->pad);
	if (ret < 0)
		return ret;
#endif

	/* Check if the sensor is really a MT9V011 */
	version = mt9v011_read(sd, R00_MT9V011_CHIP_VERSION);
	if ((version != MT9V011_VERSION) &&
	    (version != MT9V011_REV_B_VERSION)) {
		v4l2_info(sd, "*** unknown micron chip detected (0x%04x).\n",
			  version);
		return -EINVAL;
	}

	v4l2_ctrl_handler_init(&core->ctrls, 5);
	v4l2_ctrl_new_std(&core->ctrls, &mt9v011_ctrl_ops,
			  V4L2_CID_GAIN, 0, (1 << 12) - 1 - 0x20, 1, 0x20);
	v4l2_ctrl_new_std(&core->ctrls, &mt9v011_ctrl_ops,
			  V4L2_CID_EXPOSURE, 0, 2047, 1, 0x01fc);
	v4l2_ctrl_new_std(&core->ctrls, &mt9v011_ctrl_ops,
			  V4L2_CID_RED_BALANCE, -(1 << 9), (1 << 9) - 1, 1, 0);
	v4l2_ctrl_new_std(&core->ctrls, &mt9v011_ctrl_ops,
			  V4L2_CID_BLUE_BALANCE, -(1 << 9), (1 << 9) - 1, 1, 0);
	v4l2_ctrl_new_std(&core->ctrls, &mt9v011_ctrl_ops,
			  V4L2_CID_HFLIP, 0, 1, 1, 0);
	v4l2_ctrl_new_std(&core->ctrls, &mt9v011_ctrl_ops,
			  V4L2_CID_VFLIP, 0, 1, 1, 0);

	if (core->ctrls.error) {
		int ret = core->ctrls.error;

		v4l2_err(sd, "control initialization error %d\n", ret);
		v4l2_ctrl_handler_free(&core->ctrls);
		return ret;
	}
	core->sd.ctrl_handler = &core->ctrls;

	core->global_gain = 0x0024;
	core->exposure = 0x01fc;
	core->width  = 640;
	core->height = 480;
	core->xtal = 27000000;	/* Hz */

	if (c->dev.platform_data) {
		struct mt9v011_platform_data *pdata = c->dev.platform_data;

		core->xtal = pdata->xtal;
		v4l2_dbg(1, debug, sd, "xtal set to %d.%03d MHz\n",
			core->xtal / 1000000, (core->xtal / 1000) % 1000);
	}

	v4l_info(c, "chip found @ 0x%02x (%s - chip version 0x%04x)\n",
		 c->addr << 1, c->adapter->name, version);

	return 0;
}

static int mt9v011_remove(struct i2c_client *c)
{
	struct v4l2_subdev *sd = i2c_get_clientdata(c);
	struct mt9v011 *core = to_mt9v011(sd);

	v4l2_dbg(1, debug, sd,
		"mt9v011.c: removing mt9v011 adapter on address 0x%x\n",
		c->addr << 1);

	v4l2_device_unregister_subdev(sd);
	v4l2_ctrl_handler_free(&core->ctrls);

	return 0;
}

/* ----------------------------------------------------------------------- */

static const struct i2c_device_id mt9v011_id[] = {
	{ "mt9v011", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, mt9v011_id);

static struct i2c_driver mt9v011_driver = {
	.driver = {
		.name	= "mt9v011",
	},
	.probe		= mt9v011_probe,
	.remove		= mt9v011_remove,
	.id_table	= mt9v011_id,
};

module_i2c_driver(mt9v011_driver);