summaryrefslogtreecommitdiffstats
path: root/drivers/media/i2c/video-i2c.c
blob: 4d49af86c15ee4a21b6f2e58d51dac4de6a6ddb9 (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
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
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
// SPDX-License-Identifier: GPL-2.0
/*
 * video-i2c.c - Support for I2C transport video devices
 *
 * Copyright (C) 2018 Matt Ranostay <matt.ranostay@konsulko.com>
 *
 * Supported:
 * - Panasonic AMG88xx Grid-Eye Sensors
 */

#include <linux/delay.h>
#include <linux/freezer.h>
#include <linux/hwmon.h>
#include <linux/kthread.h>
#include <linux/i2c.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of_device.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/videodev2.h>
#include <media/v4l2-common.h>
#include <media/v4l2-device.h>
#include <media/v4l2-event.h>
#include <media/v4l2-fh.h>
#include <media/v4l2-ioctl.h>
#include <media/videobuf2-v4l2.h>
#include <media/videobuf2-vmalloc.h>

#define VIDEO_I2C_DRIVER	"video-i2c"

struct video_i2c_chip;

struct video_i2c_buffer {
	struct vb2_v4l2_buffer vb;
	struct list_head list;
};

struct video_i2c_data {
	struct i2c_client *client;
	const struct video_i2c_chip *chip;
	struct mutex lock;
	spinlock_t slock;
	unsigned int sequence;
	struct mutex queue_lock;

	struct v4l2_device v4l2_dev;
	struct video_device vdev;
	struct vb2_queue vb_vidq;

	struct task_struct *kthread_vid_cap;
	struct list_head vid_cap_active;
};

static const struct v4l2_fmtdesc amg88xx_format = {
	.pixelformat = V4L2_PIX_FMT_Y12,
};

static const struct v4l2_frmsize_discrete amg88xx_size = {
	.width = 8,
	.height = 8,
};

struct video_i2c_chip {
	/* video dimensions */
	const struct v4l2_fmtdesc *format;
	const struct v4l2_frmsize_discrete *size;

	/* max frames per second */
	unsigned int max_fps;

	/* pixel buffer size */
	unsigned int buffer_size;

	/* pixel size in bits */
	unsigned int bpp;

	/* xfer function */
	int (*xfer)(struct video_i2c_data *data, char *buf);

	/* hwmon init function */
	int (*hwmon_init)(struct video_i2c_data *data);
};

static int amg88xx_xfer(struct video_i2c_data *data, char *buf)
{
	struct i2c_client *client = data->client;
	struct i2c_msg msg[2];
	u8 reg = 0x80;
	int ret;

	msg[0].addr = client->addr;
	msg[0].flags = 0;
	msg[0].len = 1;
	msg[0].buf  = (char *)&reg;

	msg[1].addr = client->addr;
	msg[1].flags = I2C_M_RD;
	msg[1].len = data->chip->buffer_size;
	msg[1].buf = (char *)buf;

	ret = i2c_transfer(client->adapter, msg, 2);

	return (ret == 2) ? 0 : -EIO;
}

#if IS_ENABLED(CONFIG_HWMON)

static const u32 amg88xx_temp_config[] = {
	HWMON_T_INPUT,
	0
};

static const struct hwmon_channel_info amg88xx_temp = {
	.type = hwmon_temp,
	.config = amg88xx_temp_config,
};

static const struct hwmon_channel_info *amg88xx_info[] = {
	&amg88xx_temp,
	NULL
};

static umode_t amg88xx_is_visible(const void *drvdata,
				  enum hwmon_sensor_types type,
				  u32 attr, int channel)
{
	return 0444;
}

static int amg88xx_read(struct device *dev, enum hwmon_sensor_types type,
			u32 attr, int channel, long *val)
{
	struct video_i2c_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	int tmp = i2c_smbus_read_word_data(client, 0x0e);

	if (tmp < 0)
		return tmp;

	/*
	 * Check for sign bit, this isn't a two's complement value but an
	 * absolute temperature that needs to be inverted in the case of being
	 * negative.
	 */
	if (tmp & BIT(11))
		tmp = -(tmp & 0x7ff);

	*val = (tmp * 625) / 10;

	return 0;
}

static const struct hwmon_ops amg88xx_hwmon_ops = {
	.is_visible = amg88xx_is_visible,
	.read = amg88xx_read,
};

static const struct hwmon_chip_info amg88xx_chip_info = {
	.ops = &amg88xx_hwmon_ops,
	.info = amg88xx_info,
};

static int amg88xx_hwmon_init(struct video_i2c_data *data)
{
	void *hwmon = devm_hwmon_device_register_with_info(&data->client->dev,
				"amg88xx", data, &amg88xx_chip_info, NULL);

	return PTR_ERR_OR_ZERO(hwmon);
}
#else
#define	amg88xx_hwmon_init	NULL
#endif

#define AMG88XX		0

static const struct video_i2c_chip video_i2c_chip[] = {
	[AMG88XX] = {
		.size		= &amg88xx_size,
		.format		= &amg88xx_format,
		.max_fps	= 10,
		.buffer_size	= 128,
		.bpp		= 16,
		.xfer		= &amg88xx_xfer,
		.hwmon_init	= amg88xx_hwmon_init,
	},
};

static const struct v4l2_file_operations video_i2c_fops = {
	.owner		= THIS_MODULE,
	.open		= v4l2_fh_open,
	.release	= vb2_fop_release,
	.poll		= vb2_fop_poll,
	.read		= vb2_fop_read,
	.mmap		= vb2_fop_mmap,
	.unlocked_ioctl = video_ioctl2,
};

static int queue_setup(struct vb2_queue *vq,
		       unsigned int *nbuffers, unsigned int *nplanes,
		       unsigned int sizes[], struct device *alloc_devs[])
{
	struct video_i2c_data *data = vb2_get_drv_priv(vq);
	unsigned int size = data->chip->buffer_size;

	if (vq->num_buffers + *nbuffers < 2)
		*nbuffers = 2;

	if (*nplanes)
		return sizes[0] < size ? -EINVAL : 0;

	*nplanes = 1;
	sizes[0] = size;

	return 0;
}

static int buffer_prepare(struct vb2_buffer *vb)
{
	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
	struct video_i2c_data *data = vb2_get_drv_priv(vb->vb2_queue);
	unsigned int size = data->chip->buffer_size;

	if (vb2_plane_size(vb, 0) < size)
		return -EINVAL;

	vbuf->field = V4L2_FIELD_NONE;
	vb2_set_plane_payload(vb, 0, size);

	return 0;
}

static void buffer_queue(struct vb2_buffer *vb)
{
	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
	struct video_i2c_data *data = vb2_get_drv_priv(vb->vb2_queue);
	struct video_i2c_buffer *buf =
			container_of(vbuf, struct video_i2c_buffer, vb);

	spin_lock(&data->slock);
	list_add_tail(&buf->list, &data->vid_cap_active);
	spin_unlock(&data->slock);
}

static int video_i2c_thread_vid_cap(void *priv)
{
	struct video_i2c_data *data = priv;
	unsigned int delay = msecs_to_jiffies(1000 / data->chip->max_fps);

	set_freezable();

	do {
		unsigned long start_jiffies = jiffies;
		struct video_i2c_buffer *vid_cap_buf = NULL;
		int schedule_delay;

		try_to_freeze();

		spin_lock(&data->slock);

		if (!list_empty(&data->vid_cap_active)) {
			vid_cap_buf = list_last_entry(&data->vid_cap_active,
						 struct video_i2c_buffer, list);
			list_del(&vid_cap_buf->list);
		}

		spin_unlock(&data->slock);

		if (vid_cap_buf) {
			struct vb2_buffer *vb2_buf = &vid_cap_buf->vb.vb2_buf;
			void *vbuf = vb2_plane_vaddr(vb2_buf, 0);
			int ret;

			ret = data->chip->xfer(data, vbuf);
			vb2_buf->timestamp = ktime_get_ns();
			vid_cap_buf->vb.sequence = data->sequence++;
			vb2_buffer_done(vb2_buf, ret ?
				VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
		}

		schedule_delay = delay - (jiffies - start_jiffies);

		if (time_after(jiffies, start_jiffies + delay))
			schedule_delay = delay;

		schedule_timeout_interruptible(schedule_delay);
	} while (!kthread_should_stop());

	return 0;
}

static void video_i2c_del_list(struct vb2_queue *vq, enum vb2_buffer_state state)
{
	struct video_i2c_data *data = vb2_get_drv_priv(vq);
	struct video_i2c_buffer *buf, *tmp;

	spin_lock(&data->slock);

	list_for_each_entry_safe(buf, tmp, &data->vid_cap_active, list) {
		list_del(&buf->list);
		vb2_buffer_done(&buf->vb.vb2_buf, state);
	}

	spin_unlock(&data->slock);
}

static int start_streaming(struct vb2_queue *vq, unsigned int count)
{
	struct video_i2c_data *data = vb2_get_drv_priv(vq);

	if (data->kthread_vid_cap)
		return 0;

	data->sequence = 0;
	data->kthread_vid_cap = kthread_run(video_i2c_thread_vid_cap, data,
					    "%s-vid-cap", data->v4l2_dev.name);
	if (!IS_ERR(data->kthread_vid_cap))
		return 0;

	video_i2c_del_list(vq, VB2_BUF_STATE_QUEUED);

	return PTR_ERR(data->kthread_vid_cap);
}

static void stop_streaming(struct vb2_queue *vq)
{
	struct video_i2c_data *data = vb2_get_drv_priv(vq);

	if (data->kthread_vid_cap == NULL)
		return;

	kthread_stop(data->kthread_vid_cap);
	data->kthread_vid_cap = NULL;

	video_i2c_del_list(vq, VB2_BUF_STATE_ERROR);
}

static struct vb2_ops video_i2c_video_qops = {
	.queue_setup		= queue_setup,
	.buf_prepare		= buffer_prepare,
	.buf_queue		= buffer_queue,
	.start_streaming	= start_streaming,
	.stop_streaming		= stop_streaming,
	.wait_prepare		= vb2_ops_wait_prepare,
	.wait_finish		= vb2_ops_wait_finish,
};

static int video_i2c_querycap(struct file *file, void  *priv,
				struct v4l2_capability *vcap)
{
	struct video_i2c_data *data = video_drvdata(file);
	struct i2c_client *client = data->client;

	strscpy(vcap->driver, data->v4l2_dev.name, sizeof(vcap->driver));
	strscpy(vcap->card, data->vdev.name, sizeof(vcap->card));

	sprintf(vcap->bus_info, "I2C:%d-%d", client->adapter->nr, client->addr);

	return 0;
}

static int video_i2c_g_input(struct file *file, void *fh, unsigned int *inp)
{
	*inp = 0;

	return 0;
}

static int video_i2c_s_input(struct file *file, void *fh, unsigned int inp)
{
	return (inp > 0) ? -EINVAL : 0;
}

static int video_i2c_enum_input(struct file *file, void *fh,
				  struct v4l2_input *vin)
{
	if (vin->index > 0)
		return -EINVAL;

	strscpy(vin->name, "Camera", sizeof(vin->name));

	vin->type = V4L2_INPUT_TYPE_CAMERA;

	return 0;
}

static int video_i2c_enum_fmt_vid_cap(struct file *file, void *fh,
					struct v4l2_fmtdesc *fmt)
{
	struct video_i2c_data *data = video_drvdata(file);
	enum v4l2_buf_type type = fmt->type;

	if (fmt->index > 0)
		return -EINVAL;

	*fmt = *data->chip->format;
	fmt->type = type;

	return 0;
}

static int video_i2c_enum_framesizes(struct file *file, void *fh,
				       struct v4l2_frmsizeenum *fsize)
{
	const struct video_i2c_data *data = video_drvdata(file);
	const struct v4l2_frmsize_discrete *size = data->chip->size;

	/* currently only one frame size is allowed */
	if (fsize->index > 0)
		return -EINVAL;

	if (fsize->pixel_format != data->chip->format->pixelformat)
		return -EINVAL;

	fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
	fsize->discrete.width = size->width;
	fsize->discrete.height = size->height;

	return 0;
}

static int video_i2c_enum_frameintervals(struct file *file, void *priv,
					   struct v4l2_frmivalenum *fe)
{
	const struct video_i2c_data *data = video_drvdata(file);
	const struct v4l2_frmsize_discrete *size = data->chip->size;

	if (fe->index > 0)
		return -EINVAL;

	if (fe->width != size->width || fe->height != size->height)
		return -EINVAL;

	fe->type = V4L2_FRMIVAL_TYPE_DISCRETE;
	fe->discrete.numerator = 1;
	fe->discrete.denominator = data->chip->max_fps;

	return 0;
}

static int video_i2c_try_fmt_vid_cap(struct file *file, void *fh,
				       struct v4l2_format *fmt)
{
	const struct video_i2c_data *data = video_drvdata(file);
	const struct v4l2_frmsize_discrete *size = data->chip->size;
	struct v4l2_pix_format *pix = &fmt->fmt.pix;
	unsigned int bpp = data->chip->bpp / 8;

	pix->width = size->width;
	pix->height = size->height;
	pix->pixelformat = data->chip->format->pixelformat;
	pix->field = V4L2_FIELD_NONE;
	pix->bytesperline = pix->width * bpp;
	pix->sizeimage = pix->bytesperline * pix->height;
	pix->colorspace = V4L2_COLORSPACE_RAW;

	return 0;
}

static int video_i2c_s_fmt_vid_cap(struct file *file, void *fh,
				     struct v4l2_format *fmt)
{
	struct video_i2c_data *data = video_drvdata(file);

	if (vb2_is_busy(&data->vb_vidq))
		return -EBUSY;

	return video_i2c_try_fmt_vid_cap(file, fh, fmt);
}

static int video_i2c_g_parm(struct file *filp, void *priv,
			      struct v4l2_streamparm *parm)
{
	struct video_i2c_data *data = video_drvdata(filp);

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

	parm->parm.capture.readbuffers = 1;
	parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
	parm->parm.capture.timeperframe.numerator = 1;
	parm->parm.capture.timeperframe.denominator = data->chip->max_fps;

	return 0;
}

static const struct v4l2_ioctl_ops video_i2c_ioctl_ops = {
	.vidioc_querycap		= video_i2c_querycap,
	.vidioc_g_input			= video_i2c_g_input,
	.vidioc_s_input			= video_i2c_s_input,
	.vidioc_enum_input		= video_i2c_enum_input,
	.vidioc_enum_fmt_vid_cap	= video_i2c_enum_fmt_vid_cap,
	.vidioc_enum_framesizes		= video_i2c_enum_framesizes,
	.vidioc_enum_frameintervals	= video_i2c_enum_frameintervals,
	.vidioc_g_fmt_vid_cap		= video_i2c_try_fmt_vid_cap,
	.vidioc_s_fmt_vid_cap		= video_i2c_s_fmt_vid_cap,
	.vidioc_g_parm			= video_i2c_g_parm,
	.vidioc_s_parm			= video_i2c_g_parm,
	.vidioc_try_fmt_vid_cap		= video_i2c_try_fmt_vid_cap,
	.vidioc_reqbufs			= vb2_ioctl_reqbufs,
	.vidioc_create_bufs		= vb2_ioctl_create_bufs,
	.vidioc_prepare_buf		= vb2_ioctl_prepare_buf,
	.vidioc_querybuf		= vb2_ioctl_querybuf,
	.vidioc_qbuf			= vb2_ioctl_qbuf,
	.vidioc_dqbuf			= vb2_ioctl_dqbuf,
	.vidioc_streamon		= vb2_ioctl_streamon,
	.vidioc_streamoff		= vb2_ioctl_streamoff,
};

static void video_i2c_release(struct video_device *vdev)
{
	kfree(video_get_drvdata(vdev));
}

static int video_i2c_probe(struct i2c_client *client,
			     const struct i2c_device_id *id)
{
	struct video_i2c_data *data;
	struct v4l2_device *v4l2_dev;
	struct vb2_queue *queue;
	int ret = -ENODEV;

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

	if (dev_fwnode(&client->dev))
		data->chip = device_get_match_data(&client->dev);
	else if (id)
		data->chip = &video_i2c_chip[id->driver_data];
	else
		goto error_free_device;

	data->client = client;
	v4l2_dev = &data->v4l2_dev;
	strscpy(v4l2_dev->name, VIDEO_I2C_DRIVER, sizeof(v4l2_dev->name));

	ret = v4l2_device_register(&client->dev, v4l2_dev);
	if (ret < 0)
		goto error_free_device;

	mutex_init(&data->lock);
	mutex_init(&data->queue_lock);

	queue = &data->vb_vidq;
	queue->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	queue->io_modes = VB2_DMABUF | VB2_MMAP | VB2_USERPTR | VB2_READ;
	queue->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
	queue->drv_priv = data;
	queue->buf_struct_size = sizeof(struct video_i2c_buffer);
	queue->min_buffers_needed = 1;
	queue->ops = &video_i2c_video_qops;
	queue->mem_ops = &vb2_vmalloc_memops;

	ret = vb2_queue_init(queue);
	if (ret < 0)
		goto error_unregister_device;

	data->vdev.queue = queue;
	data->vdev.queue->lock = &data->queue_lock;

	snprintf(data->vdev.name, sizeof(data->vdev.name),
				 "I2C %d-%d Transport Video",
				 client->adapter->nr, client->addr);

	data->vdev.v4l2_dev = v4l2_dev;
	data->vdev.fops = &video_i2c_fops;
	data->vdev.lock = &data->lock;
	data->vdev.ioctl_ops = &video_i2c_ioctl_ops;
	data->vdev.release = video_i2c_release;
	data->vdev.device_caps = V4L2_CAP_VIDEO_CAPTURE |
				 V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;

	spin_lock_init(&data->slock);
	INIT_LIST_HEAD(&data->vid_cap_active);

	video_set_drvdata(&data->vdev, data);
	i2c_set_clientdata(client, data);

	if (data->chip->hwmon_init) {
		ret = data->chip->hwmon_init(data);
		if (ret < 0) {
			dev_warn(&client->dev,
				 "failed to register hwmon device\n");
		}
	}

	ret = video_register_device(&data->vdev, VFL_TYPE_GRABBER, -1);
	if (ret < 0)
		goto error_unregister_device;

	return 0;

error_unregister_device:
	v4l2_device_unregister(v4l2_dev);
	mutex_destroy(&data->lock);
	mutex_destroy(&data->queue_lock);

error_free_device:
	kfree(data);

	return ret;
}

static int video_i2c_remove(struct i2c_client *client)
{
	struct video_i2c_data *data = i2c_get_clientdata(client);

	video_unregister_device(&data->vdev);
	v4l2_device_unregister(&data->v4l2_dev);

	mutex_destroy(&data->lock);
	mutex_destroy(&data->queue_lock);

	return 0;
}

static const struct i2c_device_id video_i2c_id_table[] = {
	{ "amg88xx", AMG88XX },
	{}
};
MODULE_DEVICE_TABLE(i2c, video_i2c_id_table);

static const struct of_device_id video_i2c_of_match[] = {
	{ .compatible = "panasonic,amg88xx", .data = &video_i2c_chip[AMG88XX] },
	{}
};
MODULE_DEVICE_TABLE(of, video_i2c_of_match);

static struct i2c_driver video_i2c_driver = {
	.driver = {
		.name	= VIDEO_I2C_DRIVER,
		.of_match_table = video_i2c_of_match,
	},
	.probe		= video_i2c_probe,
	.remove		= video_i2c_remove,
	.id_table	= video_i2c_id_table,
};

module_i2c_driver(video_i2c_driver);

MODULE_AUTHOR("Matt Ranostay <matt.ranostay@konsulko.com>");
MODULE_DESCRIPTION("I2C transport video support");
MODULE_LICENSE("GPL v2");