[linux-2.6-block.git] / drivers / media / i2c / video-i2c.c

// 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/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);
};

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;
}

#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,
	},
};

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;

	strlcpy(vcap->driver, data->v4l2_dev.name, sizeof(vcap->driver));
	strlcpy(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;

	strlcpy(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;
	strlcpy(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);

	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");
Commit	Line	Data
5cebaac6 MR	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* video-i2c.c - Support for I2C transport video devices
	4	*
	5	* Copyright (C) 2018 Matt Ranostay <matt.ranostay@konsulko.com>
	6	*
	7	* Supported:
	8	* - Panasonic AMG88xx Grid-Eye Sensors
	9	*/
	10
	11	#include <linux/delay.h>
	12	#include <linux/freezer.h>
	13	#include <linux/kthread.h>
	14	#include <linux/i2c.h>
	15	#include <linux/list.h>
	16	#include <linux/module.h>
	17	#include <linux/mutex.h>
	18	#include <linux/of_device.h>
	19	#include <linux/sched.h>
	20	#include <linux/slab.h>
	21	#include <linux/videodev2.h>
	22	#include <media/v4l2-common.h>
	23	#include <media/v4l2-device.h>
	24	#include <media/v4l2-event.h>
	25	#include <media/v4l2-fh.h>
	26	#include <media/v4l2-ioctl.h>
	27	#include <media/videobuf2-v4l2.h>
	28	#include <media/videobuf2-vmalloc.h>
	29
	30	#define VIDEO_I2C_DRIVER "video-i2c"
	31
	32	struct video_i2c_chip;
	33
	34	struct video_i2c_buffer {
	35	struct vb2_v4l2_buffer vb;
	36	struct list_head list;
	37	};
	38
	39	struct video_i2c_data {
	40	struct i2c_client *client;
	41	const struct video_i2c_chip *chip;
	42	struct mutex lock;
	43	spinlock_t slock;
	44	unsigned int sequence;
	45	struct mutex queue_lock;
	46
	47	struct v4l2_device v4l2_dev;
	48	struct video_device vdev;
	49	struct vb2_queue vb_vidq;
	50
	51	struct task_struct *kthread_vid_cap;
	52	struct list_head vid_cap_active;
	53	};
	54
1b3d5f2a	55	static const struct v4l2_fmtdesc amg88xx_format = {
5cebaac6 MR	56	.pixelformat = V4L2_PIX_FMT_Y12,
	57	};
	58
1b3d5f2a	59	static const struct v4l2_frmsize_discrete amg88xx_size = {
5cebaac6 MR	60	.width = 8,
	61	.height = 8,
	62	};
	63
	64	struct video_i2c_chip {
	65	/* video dimensions */
	66	const struct v4l2_fmtdesc *format;
	67	const struct v4l2_frmsize_discrete *size;
	68
	69	/* max frames per second */
	70	unsigned int max_fps;
	71
	72	/* pixel buffer size */
	73	unsigned int buffer_size;
	74
	75	/* pixel size in bits */
	76	unsigned int bpp;
	77
	78	/* xfer function */
	79	int (xfer)(struct video_i2c_data data, char *buf);
	80	};
	81
	82	static int amg88xx_xfer(struct video_i2c_data data, char buf)
	83	{
	84	struct i2c_client *client = data->client;
	85	struct i2c_msg msg[2];
	86	u8 reg = 0x80;
	87	int ret;
	88
	89	msg[0].addr = client->addr;
	90	msg[0].flags = 0;
	91	msg[0].len = 1;
	92	msg[0].buf = (char *)®
	93
	94	msg[1].addr = client->addr;
	95	msg[1].flags = I2C_M_RD;
	96	msg[1].len = data->chip->buffer_size;
	97	msg[1].buf = (char *)buf;
	98
	99	ret = i2c_transfer(client->adapter, msg, 2);
	100
	101	return (ret == 2) ? 0 : -EIO;
	102	}
	103
	104	#define AMG88XX 0
	105
	106	static const struct video_i2c_chip video_i2c_chip[] = {
	107	[AMG88XX] = {
	108	.size = &amg88xx_size,
	109	.format = &amg88xx_format,
	110	.max_fps = 10,
	111	.buffer_size = 128,
	112	.bpp = 16,
	113	.xfer = &amg88xx_xfer,
	114	},
	115	};
	116
	117	static const struct v4l2_file_operations video_i2c_fops = {
	118	.owner = THIS_MODULE,
	119	.open = v4l2_fh_open,
	120	.release = vb2_fop_release,
	121	.poll = vb2_fop_poll,
	122	.read = vb2_fop_read,
	123	.mmap = vb2_fop_mmap,
124	.unlocked_ioctl = video_ioctl2,
125	};
126
127	static int queue_setup(struct vb2_queue *vq,
128	unsigned int nbuffers, unsigned int nplanes,
129	unsigned int sizes[], struct device *alloc_devs[])
130	{
131	struct video_i2c_data *data = vb2_get_drv_priv(vq);
132	unsigned int size = data->chip->buffer_size;
133
134	if (vq->num_buffers + *nbuffers < 2)
135	*nbuffers = 2;
136
137	if (*nplanes)
138	return sizes[0] < size ? -EINVAL : 0;
139
140	*nplanes = 1;
141	sizes[0] = size;
142
143	return 0;
144	}
145
146	static int buffer_prepare(struct vb2_buffer *vb)
147	{
148	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
149	struct video_i2c_data *data = vb2_get_drv_priv(vb->vb2_queue);
150	unsigned int size = data->chip->buffer_size;
151
152	if (vb2_plane_size(vb, 0) < size)
153	return -EINVAL;
154
155	vbuf->field = V4L2_FIELD_NONE;
156	vb2_set_plane_payload(vb, 0, size);
157
158	return 0;
159	}
160
161	static void buffer_queue(struct vb2_buffer *vb)
162	{
163	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
164	struct video_i2c_data *data = vb2_get_drv_priv(vb->vb2_queue);
165	struct video_i2c_buffer *buf =
166	container_of(vbuf, struct video_i2c_buffer, vb);
167
168	spin_lock(&data->slock);
169	list_add_tail(&buf->list, &data->vid_cap_active);
170	spin_unlock(&data->slock);
171	}
172
173	static int video_i2c_thread_vid_cap(void *priv)
174	{
175	struct video_i2c_data *data = priv;
176	unsigned int delay = msecs_to_jiffies(1000 / data->chip->max_fps);
177
178	set_freezable();
179
180	do {
181	unsigned long start_jiffies = jiffies;
182	struct video_i2c_buffer *vid_cap_buf = NULL;
183	int schedule_delay;
184
185	try_to_freeze();
186
187	spin_lock(&data->slock);
188
189	if (!list_empty(&data->vid_cap_active)) {
190	vid_cap_buf = list_last_entry(&data->vid_cap_active,
191	struct video_i2c_buffer, list);
192	list_del(&vid_cap_buf->list);
193	}
194
195	spin_unlock(&data->slock);
196
197	if (vid_cap_buf) {
198	struct vb2_buffer *vb2_buf = &vid_cap_buf->vb.vb2_buf;
199	void *vbuf = vb2_plane_vaddr(vb2_buf, 0);
200	int ret;
201
202	ret = data->chip->xfer(data, vbuf);
203	vb2_buf->timestamp = ktime_get_ns();
204	vid_cap_buf->vb.sequence = data->sequence++;
205	vb2_buffer_done(vb2_buf, ret ?
206	VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
207	}
208
209	schedule_delay = delay - (jiffies - start_jiffies);
210
211	if (time_after(jiffies, start_jiffies + delay))
212	schedule_delay = delay;
213
214	schedule_timeout_interruptible(schedule_delay);
215	} while (!kthread_should_stop());
216
217	return 0;
218	}
219
220	static void video_i2c_del_list(struct vb2_queue *vq, enum vb2_buffer_state state)
221	{
222	struct video_i2c_data *data = vb2_get_drv_priv(vq);
223	struct video_i2c_buffer buf, tmp;
224
225	spin_lock(&data->slock);
226
227	list_for_each_entry_safe(buf, tmp, &data->vid_cap_active, list) {
228	list_del(&buf->list);
229	vb2_buffer_done(&buf->vb.vb2_buf, state);
230	}
231
232	spin_unlock(&data->slock);
233	}
234
235	static int start_streaming(struct vb2_queue *vq, unsigned int count)
236	{
237	struct video_i2c_data *data = vb2_get_drv_priv(vq);
238
239	if (data->kthread_vid_cap)
240	return 0;
241
242	data->sequence = 0;
243	data->kthread_vid_cap = kthread_run(video_i2c_thread_vid_cap, data,
244	"%s-vid-cap", data->v4l2_dev.name);
245	if (!IS_ERR(data->kthread_vid_cap))
246	return 0;
247
248	video_i2c_del_list(vq, VB2_BUF_STATE_QUEUED);
249
250	return PTR_ERR(data->kthread_vid_cap);
251	}
252
253	static void stop_streaming(struct vb2_queue *vq)
254	{
255	struct video_i2c_data *data = vb2_get_drv_priv(vq);
256
257	if (data->kthread_vid_cap == NULL)
258	return;
259
260	kthread_stop(data->kthread_vid_cap);
261	data->kthread_vid_cap = NULL;
262
263	video_i2c_del_list(vq, VB2_BUF_STATE_ERROR);
264	}
265
266	static struct vb2_ops video_i2c_video_qops = {
267	.queue_setup = queue_setup,
268	.buf_prepare = buffer_prepare,
269	.buf_queue = buffer_queue,
270	.start_streaming = start_streaming,
271	.stop_streaming = stop_streaming,
272	.wait_prepare = vb2_ops_wait_prepare,
273	.wait_finish = vb2_ops_wait_finish,
274	};
275
276	static int video_i2c_querycap(struct file file, void priv,
277	struct v4l2_capability *vcap)
278	{
279	struct video_i2c_data *data = video_drvdata(file);
280	struct i2c_client *client = data->client;
281
282	strlcpy(vcap->driver, data->v4l2_dev.name, sizeof(vcap->driver));
283	strlcpy(vcap->card, data->vdev.name, sizeof(vcap->card));
284
285	sprintf(vcap->bus_info, "I2C:%d-%d", client->adapter->nr, client->addr);
286
287	return 0;
288	}
289
290	static int video_i2c_g_input(struct file file, void fh, unsigned int *inp)
291	{
292	*inp = 0;
293
294	return 0;
295	}
296
297	static int video_i2c_s_input(struct file file, void fh, unsigned int inp)
298	{
299	return (inp > 0) ? -EINVAL : 0;
300	}
301
302	static int video_i2c_enum_input(struct file file, void fh,
303	struct v4l2_input *vin)
304	{
305	if (vin->index > 0)
306	return -EINVAL;
307
308	strlcpy(vin->name, "Camera", sizeof(vin->name));
309
310	vin->type = V4L2_INPUT_TYPE_CAMERA;
311
312	return 0;
313	}
314
315	static int video_i2c_enum_fmt_vid_cap(struct file file, void fh,
316	struct v4l2_fmtdesc *fmt)
317	{
318	struct video_i2c_data *data = video_drvdata(file);
319	enum v4l2_buf_type type = fmt->type;
320
321	if (fmt->index > 0)
322	return -EINVAL;
323
324	fmt = data->chip->format;
325	fmt->type = type;
326
327	return 0;
328	}
329
330	static int video_i2c_enum_framesizes(struct file file, void fh,
331	struct v4l2_frmsizeenum *fsize)
332	{
333	const struct video_i2c_data *data = video_drvdata(file);
334	const struct v4l2_frmsize_discrete *size = data->chip->size;
335
336	/* currently only one frame size is allowed */
337	if (fsize->index > 0)
338	return -EINVAL;
339
340	if (fsize->pixel_format != data->chip->format->pixelformat)
341	return -EINVAL;
342
343	fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
344	fsize->discrete.width = size->width;
345	fsize->discrete.height = size->height;
346
347	return 0;
348	}
349
350	static int video_i2c_enum_frameintervals(struct file file, void priv,
351	struct v4l2_frmivalenum *fe)
352	{
353	const struct video_i2c_data *data = video_drvdata(file);
354	const struct v4l2_frmsize_discrete *size = data->chip->size;
355
356	if (fe->index > 0)
357	return -EINVAL;
358
359	if (fe->width != size->width \|\| fe->height != size->height)
360	return -EINVAL;
361
362	fe->type = V4L2_FRMIVAL_TYPE_DISCRETE;
363	fe->discrete.numerator = 1;
364	fe->discrete.denominator = data->chip->max_fps;
365
366	return 0;
367	}
368
369	static int video_i2c_try_fmt_vid_cap(struct file file, void fh,
370	struct v4l2_format *fmt)
371	{
372	const struct video_i2c_data *data = video_drvdata(file);
373	const struct v4l2_frmsize_discrete *size = data->chip->size;
374	struct v4l2_pix_format *pix = &fmt->fmt.pix;
375	unsigned int bpp = data->chip->bpp / 8;
376
377	pix->width = size->width;
378	pix->height = size->height;
379	pix->pixelformat = data->chip->format->pixelformat;
380	pix->field = V4L2_FIELD_NONE;
381	pix->bytesperline = pix->width * bpp;
382	pix->sizeimage = pix->bytesperline * pix->height;
383	pix->colorspace = V4L2_COLORSPACE_RAW;
384
385	return 0;
386	}
387
388	static int video_i2c_s_fmt_vid_cap(struct file file, void fh,
389	struct v4l2_format *fmt)
390	{
391	struct video_i2c_data *data = video_drvdata(file);
392
393	if (vb2_is_busy(&data->vb_vidq))
394	return -EBUSY;
395
396	return video_i2c_try_fmt_vid_cap(file, fh, fmt);
397	}
398
399	static int video_i2c_g_parm(struct file filp, void priv,
400	struct v4l2_streamparm *parm)
401	{
402	struct video_i2c_data *data = video_drvdata(filp);
403
404	if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
405	return -EINVAL;
406
407	parm->parm.capture.readbuffers = 1;
408	parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
409	parm->parm.capture.timeperframe.numerator = 1;
410	parm->parm.capture.timeperframe.denominator = data->chip->max_fps;
411
412	return 0;
413	}
414
415	static const struct v4l2_ioctl_ops video_i2c_ioctl_ops = {
416	.vidioc_querycap = video_i2c_querycap,
417	.vidioc_g_input = video_i2c_g_input,
418	.vidioc_s_input = video_i2c_s_input,
419	.vidioc_enum_input = video_i2c_enum_input,
420	.vidioc_enum_fmt_vid_cap = video_i2c_enum_fmt_vid_cap,
421	.vidioc_enum_framesizes = video_i2c_enum_framesizes,
422	.vidioc_enum_frameintervals = video_i2c_enum_frameintervals,
423	.vidioc_g_fmt_vid_cap = video_i2c_try_fmt_vid_cap,
424	.vidioc_s_fmt_vid_cap = video_i2c_s_fmt_vid_cap,
425	.vidioc_g_parm = video_i2c_g_parm,
426	.vidioc_s_parm = video_i2c_g_parm,
427	.vidioc_try_fmt_vid_cap = video_i2c_try_fmt_vid_cap,
428	.vidioc_reqbufs = vb2_ioctl_reqbufs,
429	.vidioc_create_bufs = vb2_ioctl_create_bufs,
430	.vidioc_prepare_buf = vb2_ioctl_prepare_buf,
431	.vidioc_querybuf = vb2_ioctl_querybuf,
432	.vidioc_qbuf = vb2_ioctl_qbuf,
433	.vidioc_dqbuf = vb2_ioctl_dqbuf,
434	.vidioc_streamon = vb2_ioctl_streamon,
435	.vidioc_streamoff = vb2_ioctl_streamoff,
436	};
437
438	static void video_i2c_release(struct video_device *vdev)
439	{
440	kfree(video_get_drvdata(vdev));
441	}
442
443	static int video_i2c_probe(struct i2c_client *client,
444	const struct i2c_device_id *id)
445	{
446	struct video_i2c_data *data;
447	struct v4l2_device *v4l2_dev;
448	struct vb2_queue *queue;
449	int ret = -ENODEV;
450
451	data = kzalloc(sizeof(*data), GFP_KERNEL);
452	if (!data)
453	return -ENOMEM;
454
455	if (dev_fwnode(&client->dev))
456	data->chip = device_get_match_data(&client->dev);
457	else if (id)
458	data->chip = &video_i2c_chip[id->driver_data];
459	else
460	goto error_free_device;
461
462	data->client = client;
463	v4l2_dev = &data->v4l2_dev;
464	strlcpy(v4l2_dev->name, VIDEO_I2C_DRIVER, sizeof(v4l2_dev->name));
465
466	ret = v4l2_device_register(&client->dev, v4l2_dev);
467	if (ret < 0)
468	goto error_free_device;
469
470	mutex_init(&data->lock);
471	mutex_init(&data->queue_lock);
472
473	queue = &data->vb_vidq;
474	queue->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
475	queue->io_modes = VB2_DMABUF \| VB2_MMAP \| VB2_USERPTR \| VB2_READ;
476	queue->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
477	queue->drv_priv = data;
478	queue->buf_struct_size = sizeof(struct video_i2c_buffer);
479	queue->min_buffers_needed = 1;
480	queue->ops = &video_i2c_video_qops;
481	queue->mem_ops = &vb2_vmalloc_memops;
482
483	ret = vb2_queue_init(queue);
484	if (ret < 0)
485	goto error_unregister_device;
486
487	data->vdev.queue = queue;
488	data->vdev.queue->lock = &data->queue_lock;
489
490	snprintf(data->vdev.name, sizeof(data->vdev.name),
491	"I2C %d-%d Transport Video",
492	client->adapter->nr, client->addr);
493
494	data->vdev.v4l2_dev = v4l2_dev;
495	data->vdev.fops = &video_i2c_fops;
496	data->vdev.lock = &data->lock;
497	data->vdev.ioctl_ops = &video_i2c_ioctl_ops;
498	data->vdev.release = video_i2c_release;
499	data->vdev.device_caps = V4L2_CAP_VIDEO_CAPTURE \|
500	V4L2_CAP_READWRITE \| V4L2_CAP_STREAMING;
501
502	spin_lock_init(&data->slock);
503	INIT_LIST_HEAD(&data->vid_cap_active);
504
505	video_set_drvdata(&data->vdev, data);
506	i2c_set_clientdata(client, data);
507
508	ret = video_register_device(&data->vdev, VFL_TYPE_GRABBER, -1);
509	if (ret < 0)
510	goto error_unregister_device;
511
512	return 0;
513
514	error_unregister_device:
515	v4l2_device_unregister(v4l2_dev);
516	mutex_destroy(&data->lock);
517	mutex_destroy(&data->queue_lock);
518
519	error_free_device:
520	kfree(data);
521
522	return ret;
523	}
524
525	static int video_i2c_remove(struct i2c_client *client)
526	{
527	struct video_i2c_data *data = i2c_get_clientdata(client);
528
529	video_unregister_device(&data->vdev);
530	v4l2_device_unregister(&data->v4l2_dev);
531
532	mutex_destroy(&data->lock);
533	mutex_destroy(&data->queue_lock);
534
535	return 0;
536	}
537
538	static const struct i2c_device_id video_i2c_id_table[] = {
539	{ "amg88xx", AMG88XX },
540	{}
541	};
542	MODULE_DEVICE_TABLE(i2c, video_i2c_id_table);
543
544	static const struct of_device_id video_i2c_of_match[] = {
545	{ .compatible = "panasonic,amg88xx", .data = &video_i2c_chip[AMG88XX] },
546	{}
547	};
548	MODULE_DEVICE_TABLE(of, video_i2c_of_match);
549
550	static struct i2c_driver video_i2c_driver = {
551	.driver = {
552	.name = VIDEO_I2C_DRIVER,
553	.of_match_table = video_i2c_of_match,
554	},
555	.probe = video_i2c_probe,
556	.remove = video_i2c_remove,
557	.id_table = video_i2c_id_table,
558	};
559
560	module_i2c_driver(video_i2c_driver);
561
562	MODULE_AUTHOR("Matt Ranostay <matt.ranostay@konsulko.com>");
563	MODULE_DESCRIPTION("I2C transport video support");
564	MODULE_LICENSE("GPL v2");