[linux-2.6-block.git] / drivers / staging / most / aim-v4l2 / video.c

/*
 * V4L2 AIM - V4L2 Application Interface Module for MostCore
 *
 * Copyright (C) 2015, Microchip Technology Germany II GmbH & Co. KG
 *
 * 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.
 *
 * This file is licensed under GPLv2.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/suspend.h>
#include <linux/videodev2.h>
#include <linux/mutex.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-event.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-fh.h>

#include "mostcore.h"

#define V4L2_AIM_MAX_INPUT  1

static struct most_aim aim_info;

struct most_video_dev {
	struct most_interface *iface;
	int ch_idx;
	struct list_head list;
	bool mute;

	struct list_head pending_mbos;
	spinlock_t list_lock;

	struct v4l2_device v4l2_dev;
	atomic_t access_ref;
	struct video_device *vdev;
	unsigned int ctrl_input;

	struct mutex lock;

	wait_queue_head_t wait_data;
};

struct aim_fh {
	/* must be the first field of this struct! */
	struct v4l2_fh fh;
	struct most_video_dev *mdev;
	u32 offs;
};

static struct list_head video_devices = LIST_HEAD_INIT(video_devices);
static struct spinlock list_lock;

static inline bool data_ready(struct most_video_dev *mdev)
{
	return !list_empty(&mdev->pending_mbos);
}

static inline struct mbo *get_top_mbo(struct most_video_dev *mdev)
{
	return list_first_entry(&mdev->pending_mbos, struct mbo, list);
}

static int aim_vdev_open(struct file *filp)
{
	int ret;
	struct video_device *vdev = video_devdata(filp);
	struct most_video_dev *mdev = video_drvdata(filp);
	struct aim_fh *fh;

	pr_info("aim_vdev_open()\n");

	switch (vdev->vfl_type) {
	case VFL_TYPE_GRABBER:
		break;
	default:
		return -EINVAL;
	}

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

	if (!atomic_inc_and_test(&mdev->access_ref)) {
		pr_err("too many clients\n");
		ret = -EBUSY;
		goto err_dec;
	}

	fh->mdev = mdev;
	v4l2_fh_init(&fh->fh, vdev);
	filp->private_data = fh;

	v4l2_fh_add(&fh->fh);

	ret = most_start_channel(mdev->iface, mdev->ch_idx, &aim_info);
	if (ret) {
		pr_err("most_start_channel() failed\n");
		goto err_rm;
	}

	return 0;

err_rm:
	v4l2_fh_del(&fh->fh);
	v4l2_fh_exit(&fh->fh);

err_dec:
	atomic_dec(&mdev->access_ref);
	kfree(fh);
	return ret;
}

static int aim_vdev_close(struct file *filp)
{
	struct aim_fh *fh = filp->private_data;
	struct most_video_dev *mdev = fh->mdev;
	struct mbo *mbo, *tmp;

	pr_info("aim_vdev_close()\n");

	/*
	 * We need to put MBOs back before we call most_stop_channel()
	 * to deallocate MBOs.
	 * From the other hand mostcore still calling rx_completion()
	 * to deliver MBOs until most_stop_channel() is called.
	 * Use mute to work around this issue.
	 * This must be implemented in core.
	 */

	spin_lock_irq(&mdev->list_lock);
	mdev->mute = true;
	list_for_each_entry_safe(mbo, tmp, &mdev->pending_mbos, list) {
		list_del(&mbo->list);
		spin_unlock_irq(&mdev->list_lock);
		most_put_mbo(mbo);
		spin_lock_irq(&mdev->list_lock);
	}
	spin_unlock_irq(&mdev->list_lock);
	most_stop_channel(mdev->iface, mdev->ch_idx, &aim_info);
	mdev->mute = false;

	v4l2_fh_del(&fh->fh);
	v4l2_fh_exit(&fh->fh);

	atomic_dec(&mdev->access_ref);
	kfree(fh);
	return 0;
}

static ssize_t aim_vdev_read(struct file *filp, char __user *buf,
			     size_t count, loff_t *pos)
{
	struct aim_fh *fh = filp->private_data;
	struct most_video_dev *mdev = fh->mdev;
	int ret = 0;

	if (*pos)
		return -ESPIPE;

	if (!mdev)
		return -ENODEV;

	/* wait for the first buffer */
	if (!(filp->f_flags & O_NONBLOCK)) {
		if (wait_event_interruptible(mdev->wait_data, data_ready(mdev)))
			return -ERESTARTSYS;
	}

	if (!data_ready(mdev))
		return -EAGAIN;

	while (count > 0 && data_ready(mdev)) {
		struct mbo *const mbo = get_top_mbo(mdev);
		int const rem = mbo->processed_length - fh->offs;
		int const cnt = rem < count ? rem : count;

		if (copy_to_user(buf, mbo->virt_address + fh->offs, cnt)) {
			pr_err("read: copy_to_user failed\n");
			if (!ret)
				ret = -EFAULT;
			return ret;
		}

		fh->offs += cnt;
		count -= cnt;
		buf += cnt;
		ret += cnt;

		if (cnt >= rem) {
			fh->offs = 0;
			spin_lock_irq(&mdev->list_lock);
			list_del(&mbo->list);
			spin_unlock_irq(&mdev->list_lock);
			most_put_mbo(mbo);
		}
	}
	return ret;
}

static unsigned int aim_vdev_poll(struct file *filp, poll_table *wait)
{
	struct aim_fh *fh = filp->private_data;
	struct most_video_dev *mdev = fh->mdev;
	unsigned int mask = 0;

	/* only wait if no data is available */
	if (!data_ready(mdev))
		poll_wait(filp, &mdev->wait_data, wait);
	if (data_ready(mdev))
		mask |= POLLIN | POLLRDNORM;

	return mask;
}

static void aim_set_format_struct(struct v4l2_format *f)
{
	f->fmt.pix.width = 8;
	f->fmt.pix.height = 8;
	f->fmt.pix.pixelformat = V4L2_PIX_FMT_MPEG;
	f->fmt.pix.bytesperline = 0;
	f->fmt.pix.sizeimage = 188 * 2;
	f->fmt.pix.colorspace = V4L2_COLORSPACE_REC709;
	f->fmt.pix.field = V4L2_FIELD_NONE;
	f->fmt.pix.priv = 0;
}

static int aim_set_format(struct most_video_dev *mdev, unsigned int cmd,
			  struct v4l2_format *format)
{
	if (format->fmt.pix.pixelformat != V4L2_PIX_FMT_MPEG)
		return -EINVAL;

	if (cmd == VIDIOC_TRY_FMT)
		return 0;

	aim_set_format_struct(format);

	return 0;
}

static int vidioc_querycap(struct file *file, void  *priv,
			   struct v4l2_capability *cap)
{
	struct aim_fh *fh = priv;
	struct most_video_dev *mdev = fh->mdev;

	pr_info("vidioc_querycap()\n");

	strlcpy(cap->driver, "v4l2_most_aim", sizeof(cap->driver));
	strlcpy(cap->card, "my_card", sizeof(cap->card));
	snprintf(cap->bus_info, sizeof(cap->bus_info),
		 "%s", mdev->iface->description);

	cap->capabilities =
		V4L2_CAP_READWRITE |
		V4L2_CAP_TUNER |
		V4L2_CAP_VIDEO_CAPTURE;
	return 0;
}

static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
				   struct v4l2_fmtdesc *f)
{
	pr_info("vidioc_enum_fmt_vid_cap() %d\n", f->index);

	if (f->index)
		return -EINVAL;

	strcpy(f->description, "MPEG");
	f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	f->flags = V4L2_FMT_FLAG_COMPRESSED;
	f->pixelformat = V4L2_PIX_FMT_MPEG;

	return 0;
}

static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
				struct v4l2_format *f)
{
	pr_info("vidioc_g_fmt_vid_cap()\n");

	aim_set_format_struct(f);
	return 0;
}

static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
				  struct v4l2_format *f)
{
	struct aim_fh *fh  = priv;
	struct most_video_dev *mdev = fh->mdev;

	return aim_set_format(mdev, VIDIOC_TRY_FMT, f);
}

static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
				struct v4l2_format *f)
{
	struct aim_fh *fh  = priv;
	struct most_video_dev *mdev = fh->mdev;

	return aim_set_format(mdev, VIDIOC_S_FMT, f);
}

static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *norm)
{
	pr_info("vidioc_g_std()\n");

	*norm = V4L2_STD_UNKNOWN;
	return 0;
}

static int vidioc_enum_input(struct file *file, void *priv,
			     struct v4l2_input *input)
{
	struct aim_fh *fh = priv;
	struct most_video_dev *mdev = fh->mdev;

	if (input->index >= V4L2_AIM_MAX_INPUT)
		return -EINVAL;

	strcpy(input->name, "MOST Video");
	input->type |= V4L2_INPUT_TYPE_CAMERA;
	input->audioset = 0;

	input->std = mdev->vdev->tvnorms;

	return 0;
}

static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
{
	struct aim_fh *fh = priv;
	struct most_video_dev *mdev = fh->mdev;
	*i = mdev->ctrl_input;
	return 0;
}

static int vidioc_s_input(struct file *file, void *priv, unsigned int index)
{
	struct aim_fh *fh = priv;
	struct most_video_dev *mdev = fh->mdev;

	pr_info("vidioc_s_input(%d)\n", index);

	if (index >= V4L2_AIM_MAX_INPUT)
		return -EINVAL;
	mdev->ctrl_input = index;
	return 0;
}

static struct v4l2_file_operations aim_fops = {
	.owner      = THIS_MODULE,
	.open       = aim_vdev_open,
	.release    = aim_vdev_close,
	.read       = aim_vdev_read,
	.poll       = aim_vdev_poll,
	.unlocked_ioctl = video_ioctl2,
};

static const struct v4l2_ioctl_ops video_ioctl_ops = {
	.vidioc_querycap            = vidioc_querycap,
	.vidioc_enum_fmt_vid_cap    = vidioc_enum_fmt_vid_cap,
	.vidioc_g_fmt_vid_cap       = vidioc_g_fmt_vid_cap,
	.vidioc_try_fmt_vid_cap     = vidioc_try_fmt_vid_cap,
	.vidioc_s_fmt_vid_cap       = vidioc_s_fmt_vid_cap,
	.vidioc_g_std               = vidioc_g_std,
	.vidioc_enum_input          = vidioc_enum_input,
	.vidioc_g_input             = vidioc_g_input,
	.vidioc_s_input             = vidioc_s_input,
};

static const struct video_device aim_videodev_template = {
	.fops = &aim_fops,
	.release = video_device_release,
	.ioctl_ops = &video_ioctl_ops,
	.tvnorms = V4L2_STD_UNKNOWN,
};

/**************************************************************************/

static struct most_video_dev *get_aim_dev(
	struct most_interface *iface, int channel_idx)
{
	struct most_video_dev *mdev;
	unsigned long flags;

	spin_lock_irqsave(&list_lock, flags);
	list_for_each_entry(mdev, &video_devices, list) {
		if (mdev->iface == iface && mdev->ch_idx == channel_idx) {
			spin_unlock_irqrestore(&list_lock, flags);
			return mdev;
		}
	}
	spin_unlock_irqrestore(&list_lock, flags);
	return NULL;
}

static int aim_rx_data(struct mbo *mbo)
{
	unsigned long flags;
	struct most_video_dev *mdev =
		get_aim_dev(mbo->ifp, mbo->hdm_channel_id);

	if (!mdev)
		return -EIO;

	spin_lock_irqsave(&mdev->list_lock, flags);
	if (unlikely(mdev->mute)) {
		spin_unlock_irqrestore(&mdev->list_lock, flags);
		return -EIO;
	}

	list_add_tail(&mbo->list, &mdev->pending_mbos);
	spin_unlock_irqrestore(&mdev->list_lock, flags);
	wake_up_interruptible(&mdev->wait_data);
	return 0;
}

static int aim_register_videodev(struct most_video_dev *mdev)
{
	int retval = -ENOMEM;
	int ret;

	pr_info("aim_register_videodev()\n");

	init_waitqueue_head(&mdev->wait_data);

	/* allocate and fill v4l2 video struct */
	mdev->vdev = video_device_alloc();
	if (!mdev->vdev)
		return -ENOMEM;

	/* Fill the video capture device struct */
	*mdev->vdev = aim_videodev_template;
	mdev->vdev->v4l2_dev = &mdev->v4l2_dev;
	mdev->vdev->lock = &mdev->lock;
	strcpy(mdev->vdev->name, "most v4l2 aim video");

	/* Register the v4l2 device */
	video_set_drvdata(mdev->vdev, mdev);
	retval = video_register_device(mdev->vdev, VFL_TYPE_GRABBER, -1);
	if (retval != 0) {
		pr_err("video_register_device failed (%d)\n", retval);
		ret = -ENODEV;
		goto err_vbi_dev;
	}

	return 0;

err_vbi_dev:
	video_device_release(mdev->vdev);
	return ret;
}

static void aim_unregister_videodev(struct most_video_dev *mdev)
{
	pr_info("aim_unregister_videodev()\n");

	video_unregister_device(mdev->vdev);
}

static void aim_v4l2_dev_release(struct v4l2_device *v4l2_dev)
{
	struct most_video_dev *mdev =
		container_of(v4l2_dev, struct most_video_dev, v4l2_dev);

	v4l2_device_unregister(v4l2_dev);
	kfree(mdev);
}

static int aim_probe_channel(struct most_interface *iface, int channel_idx,
			     struct most_channel_config *ccfg,
			     struct kobject *parent, char *name)
{
	int ret;
	struct most_video_dev *mdev = get_aim_dev(iface, channel_idx);

	pr_info("aim_probe_channel()\n");

	if (mdev) {
		pr_err("channel already linked\n");
		return -EEXIST;
	}

	if (ccfg->direction != MOST_CH_RX) {
		pr_err("wrong direction, expect rx\n");
		return -EINVAL;
	}

	if (ccfg->data_type != MOST_CH_SYNC &&
	    ccfg->data_type != MOST_CH_ISOC_AVP) {
		pr_err("wrong channel type, expect sync or isoc_avp\n");
		return -EINVAL;
	}

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

	mutex_init(&mdev->lock);
	atomic_set(&mdev->access_ref, -1);
	spin_lock_init(&mdev->list_lock);
	INIT_LIST_HEAD(&mdev->pending_mbos);
	mdev->iface = iface;
	mdev->ch_idx = channel_idx;
	mdev->v4l2_dev.release = aim_v4l2_dev_release;

	/* Create the v4l2_device */
	strlcpy(mdev->v4l2_dev.name, "most_video_device",
		sizeof(mdev->v4l2_dev.name));
	ret = v4l2_device_register(NULL, &mdev->v4l2_dev);
	if (ret) {
		pr_err("v4l2_device_register() failed\n");
		kfree(mdev);
		return ret;
	}

	ret = aim_register_videodev(mdev);
	if (ret)
		goto err_unreg;

	spin_lock_irq(&list_lock);
	list_add(&mdev->list, &video_devices);
	spin_unlock_irq(&list_lock);
	return 0;

err_unreg:
	v4l2_device_disconnect(&mdev->v4l2_dev);
	v4l2_device_put(&mdev->v4l2_dev);
	return ret;
}

static int aim_disconnect_channel(struct most_interface *iface,
				  int channel_idx)
{
	struct most_video_dev *mdev = get_aim_dev(iface, channel_idx);

	pr_info("aim_disconnect_channel()\n");

	if (!mdev) {
		pr_err("no such channel is linked\n");
		return -ENOENT;
	}

	spin_lock_irq(&list_lock);
	list_del(&mdev->list);
	spin_unlock_irq(&list_lock);

	aim_unregister_videodev(mdev);
	v4l2_device_disconnect(&mdev->v4l2_dev);
	v4l2_device_put(&mdev->v4l2_dev);
	return 0;
}

static struct most_aim aim_info = {
	.name = "v4l",
	.probe_channel = aim_probe_channel,
	.disconnect_channel = aim_disconnect_channel,
	.rx_completion = aim_rx_data,
};

static int __init aim_init(void)
{
	spin_lock_init(&list_lock);
	return most_register_aim(&aim_info);
}

static void __exit aim_exit(void)
{
	struct most_video_dev *mdev, *tmp;

	/*
	 * As the mostcore currently doesn't call disconnect_channel()
	 * for linked channels while we call most_deregister_aim()
	 * we simulate this call here.
	 * This must be fixed in core.
	 */
	spin_lock_irq(&list_lock);
	list_for_each_entry_safe(mdev, tmp, &video_devices, list) {
		list_del(&mdev->list);
		spin_unlock_irq(&list_lock);

		aim_unregister_videodev(mdev);
		v4l2_device_disconnect(&mdev->v4l2_dev);
		v4l2_device_put(&mdev->v4l2_dev);
		spin_lock_irq(&list_lock);
	}
	spin_unlock_irq(&list_lock);

	most_deregister_aim(&aim_info);
	BUG_ON(!list_empty(&video_devices));
}

module_init(aim_init);
module_exit(aim_exit);

MODULE_DESCRIPTION("V4L2 Application Interface Module for MostCore");
MODULE_AUTHOR("Andrey Shvetsov <andrey.shvetsov@k2l.de>");
MODULE_LICENSE("GPL");
Commit	Line	Data
3d31c0cb CG	1	/*
	2	* V4L2 AIM - V4L2 Application Interface Module for MostCore
	3	*
	4	* Copyright (C) 2015, Microchip Technology Germany II GmbH & Co. KG
	5	*
	6	* This program is distributed in the hope that it will be useful,
	7	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	8	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	9	* GNU General Public License for more details.
	10	*
	11	* This file is licensed under GPLv2.
	12	*/
	13
	14	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	15
	16	#include <linux/module.h>
	17	#include <linux/slab.h>
	18	#include <linux/init.h>
	19	#include <linux/device.h>
	20	#include <linux/suspend.h>
	21	#include <linux/videodev2.h>
	22	#include <linux/mutex.h>
	23	#include <media/v4l2-common.h>
	24	#include <media/v4l2-ioctl.h>
	25	#include <media/v4l2-event.h>
	26	#include <media/v4l2-device.h>
	27	#include <media/v4l2-ctrls.h>
	28	#include <media/v4l2-fh.h>
	29
	30	#include "mostcore.h"
	31
3d31c0cb CG	32	#define V4L2_AIM_MAX_INPUT 1
3d31c0cb CG	33
f13f6981	34	static struct most_aim aim_info;
3d31c0cb CG	35
	36	struct most_video_dev {
	37	struct most_interface *iface;
	38	int ch_idx;
	39	struct list_head list;
	40	bool mute;
	41
	42	struct list_head pending_mbos;
	43	spinlock_t list_lock;
	44
	45	struct v4l2_device v4l2_dev;
	46	atomic_t access_ref;
	47	struct video_device *vdev;
	48	unsigned int ctrl_input;
	49
	50	struct mutex lock;
	51
	52	wait_queue_head_t wait_data;
	53	};
	54
	55	struct aim_fh {
	56	/* must be the first field of this struct! */
	57	struct v4l2_fh fh;
	58	struct most_video_dev *mdev;
	59	u32 offs;
	60	};
	61
3d31c0cb CG	62	static struct list_head video_devices = LIST_HEAD_INIT(video_devices);
3d31c0cb CG	63	static struct spinlock list_lock;
3d31c0cb	64
3d31c0cb CG	65	static inline bool data_ready(struct most_video_dev *mdev)
	66	{
	67	return !list_empty(&mdev->pending_mbos);
	68	}
	69
	70	static inline struct mbo get_top_mbo(struct most_video_dev mdev)
	71	{
	72	return list_first_entry(&mdev->pending_mbos, struct mbo, list);
	73	}
	74
3d31c0cb CG	75	static int aim_vdev_open(struct file *filp)
	76	{
	77	int ret;
	78	struct video_device *vdev = video_devdata(filp);
	79	struct most_video_dev *mdev = video_drvdata(filp);
	80	struct aim_fh *fh;
	81
	82	pr_info("aim_vdev_open()\n");
	83
	84	switch (vdev->vfl_type) {
	85	case VFL_TYPE_GRABBER:
	86	break;
	87	default:
	88	return -EINVAL;
	89	}
	90
181a2aa1	91	fh = kzalloc(sizeof(*fh), GFP_KERNEL);
3d31c0cb CG	92	if (!fh)
	93	return -ENOMEM;
	94
	95	if (!atomic_inc_and_test(&mdev->access_ref)) {
	96	pr_err("too many clients\n");
	97	ret = -EBUSY;
	98	goto err_dec;
	99	}
	100
	101	fh->mdev = mdev;
	102	v4l2_fh_init(&fh->fh, vdev);
	103	filp->private_data = fh;
	104
	105	v4l2_fh_add(&fh->fh);
	106
f13f6981	107	ret = most_start_channel(mdev->iface, mdev->ch_idx, &aim_info);
3d31c0cb CG	108	if (ret) {
	109	pr_err("most_start_channel() failed\n");
	110	goto err_rm;
	111	}
	112
	113	return 0;
	114
	115	err_rm:
	116	v4l2_fh_del(&fh->fh);
	117	v4l2_fh_exit(&fh->fh);
	118
	119	err_dec:
	120	atomic_dec(&mdev->access_ref);
	121	kfree(fh);
	122	return ret;
	123	}
	124
	125	static int aim_vdev_close(struct file *filp)
	126	{
	127	struct aim_fh *fh = filp->private_data;
	128	struct most_video_dev *mdev = fh->mdev;
	129	struct mbo mbo, tmp;
	130
	131	pr_info("aim_vdev_close()\n");
	132
	133	/*
	134	* We need to put MBOs back before we call most_stop_channel()
	135	* to deallocate MBOs.
	136	* From the other hand mostcore still calling rx_completion()
	137	* to deliver MBOs until most_stop_channel() is called.
	138	* Use mute to work around this issue.
	139	* This must be implemented in core.
	140	*/
	141
e494df03	142	spin_lock_irq(&mdev->list_lock);
3d31c0cb CG	143	mdev->mute = true;
	144	list_for_each_entry_safe(mbo, tmp, &mdev->pending_mbos, list) {
	145	list_del(&mbo->list);
e494df03	146	spin_unlock_irq(&mdev->list_lock);
3d31c0cb	147	most_put_mbo(mbo);
e494df03	148	spin_lock_irq(&mdev->list_lock);
3d31c0cb	149	}
e494df03	150	spin_unlock_irq(&mdev->list_lock);
f13f6981	151	most_stop_channel(mdev->iface, mdev->ch_idx, &aim_info);
3d31c0cb CG	152	mdev->mute = false;
	153
	154	v4l2_fh_del(&fh->fh);
	155	v4l2_fh_exit(&fh->fh);
	156
	157	atomic_dec(&mdev->access_ref);
	158	kfree(fh);
	159	return 0;
	160	}
	161
	162	static ssize_t aim_vdev_read(struct file filp, char __user buf,
	163	size_t count, loff_t *pos)
	164	{
	165	struct aim_fh *fh = filp->private_data;
	166	struct most_video_dev *mdev = fh->mdev;
	167	int ret = 0;
	168
	169	if (*pos)
	170	return -ESPIPE;
	171
	172	if (!mdev)
	173	return -ENODEV;
	174
	175	/* wait for the first buffer */
	176	if (!(filp->f_flags & O_NONBLOCK)) {
	177	if (wait_event_interruptible(mdev->wait_data, data_ready(mdev)))
	178	return -ERESTARTSYS;
	179	}
	180
	181	if (!data_ready(mdev))
	182	return -EAGAIN;
	183
	184	while (count > 0 && data_ready(mdev)) {
	185	struct mbo *const mbo = get_top_mbo(mdev);
	186	int const rem = mbo->processed_length - fh->offs;
	187	int const cnt = rem < count ? rem : count;
	188
	189	if (copy_to_user(buf, mbo->virt_address + fh->offs, cnt)) {
	190	pr_err("read: copy_to_user failed\n");
	191	if (!ret)
	192	ret = -EFAULT;
	193	return ret;
	194	}
	195
	196	fh->offs += cnt;
	197	count -= cnt;
	198	buf += cnt;
	199	ret += cnt;
	200
	201	if (cnt >= rem) {
	202	fh->offs = 0;
e494df03	203	spin_lock_irq(&mdev->list_lock);
3d31c0cb	204	list_del(&mbo->list);
e494df03	205	spin_unlock_irq(&mdev->list_lock);
3d31c0cb CG	206	most_put_mbo(mbo);
	207	}
	208	}
	209	return ret;
	210	}
	211
	212	static unsigned int aim_vdev_poll(struct file filp, poll_table wait)
	213	{
	214	struct aim_fh *fh = filp->private_data;
	215	struct most_video_dev *mdev = fh->mdev;
	216	unsigned int mask = 0;
	217
	218	/* only wait if no data is available */
	219	if (!data_ready(mdev))
	220	poll_wait(filp, &mdev->wait_data, wait);
	221	if (data_ready(mdev))
	222	mask \|= POLLIN \| POLLRDNORM;
	223
	224	return mask;
	225	}
	226
	227	static void aim_set_format_struct(struct v4l2_format *f)
	228	{
	229	f->fmt.pix.width = 8;
	230	f->fmt.pix.height = 8;
	231	f->fmt.pix.pixelformat = V4L2_PIX_FMT_MPEG;
	232	f->fmt.pix.bytesperline = 0;
	233	f->fmt.pix.sizeimage = 188 * 2;
	234	f->fmt.pix.colorspace = V4L2_COLORSPACE_REC709;
	235	f->fmt.pix.field = V4L2_FIELD_NONE;
	236	f->fmt.pix.priv = 0;
	237	}
	238
	239	static int aim_set_format(struct most_video_dev *mdev, unsigned int cmd,
	240	struct v4l2_format *format)
	241	{
3d31c0cb CG	242	if (format->fmt.pix.pixelformat != V4L2_PIX_FMT_MPEG)
	243	return -EINVAL;
	244
	245	if (cmd == VIDIOC_TRY_FMT)
	246	return 0;
	247
	248	aim_set_format_struct(format);
	249
	250	return 0;
	251	}
	252
3d31c0cb CG	253	static int vidioc_querycap(struct file file, void priv,
	254	struct v4l2_capability *cap)
	255	{
	256	struct aim_fh *fh = priv;
	257	struct most_video_dev *mdev = fh->mdev;
	258
	259	pr_info("vidioc_querycap()\n");
	260
	261	strlcpy(cap->driver, "v4l2_most_aim", sizeof(cap->driver));
	262	strlcpy(cap->card, "my_card", sizeof(cap->card));
	263	snprintf(cap->bus_info, sizeof(cap->bus_info),
	264	"%s", mdev->iface->description);
	265
	266	cap->capabilities =
	267	V4L2_CAP_READWRITE \|
	268	V4L2_CAP_TUNER \|
	269	V4L2_CAP_VIDEO_CAPTURE;
	270	return 0;
	271	}
	272
	273	static int vidioc_enum_fmt_vid_cap(struct file file, void priv,
	274	struct v4l2_fmtdesc *f)
	275	{
	276	pr_info("vidioc_enum_fmt_vid_cap() %d\n", f->index);
	277
	278	if (f->index)
	279	return -EINVAL;
	280
	281	strcpy(f->description, "MPEG");
	282	f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	283	f->flags = V4L2_FMT_FLAG_COMPRESSED;
	284	f->pixelformat = V4L2_PIX_FMT_MPEG;
	285
	286	return 0;
	287	}
	288
	289	static int vidioc_g_fmt_vid_cap(struct file file, void priv,
	290	struct v4l2_format *f)
	291	{
	292	pr_info("vidioc_g_fmt_vid_cap()\n");
	293
	294	aim_set_format_struct(f);
	295	return 0;
	296	}
	297
	298	static int vidioc_try_fmt_vid_cap(struct file file, void priv,
	299	struct v4l2_format *f)
	300	{
	301	struct aim_fh *fh = priv;
	302	struct most_video_dev *mdev = fh->mdev;
	303
	304	return aim_set_format(mdev, VIDIOC_TRY_FMT, f);
	305	}
	306
	307	static int vidioc_s_fmt_vid_cap(struct file file, void priv,
	308	struct v4l2_format *f)
	309	{
	310	struct aim_fh *fh = priv;
	311	struct most_video_dev *mdev = fh->mdev;
	312
	313	return aim_set_format(mdev, VIDIOC_S_FMT, f);
	314	}
	315
	316	static int vidioc_g_std(struct file file, void priv, v4l2_std_id *norm)
317	{
318	pr_info("vidioc_g_std()\n");
319
320	*norm = V4L2_STD_UNKNOWN;
321	return 0;
322	}
323
324	static int vidioc_enum_input(struct file file, void priv,
325	struct v4l2_input *input)
326	{
327	struct aim_fh *fh = priv;
328	struct most_video_dev *mdev = fh->mdev;
329
330	if (input->index >= V4L2_AIM_MAX_INPUT)
331	return -EINVAL;
332
333	strcpy(input->name, "MOST Video");
334	input->type \|= V4L2_INPUT_TYPE_CAMERA;
335	input->audioset = 0;
336
337	input->std = mdev->vdev->tvnorms;
338
339	return 0;
340	}
341
342	static int vidioc_g_input(struct file file, void priv, unsigned int *i)
343	{
344	struct aim_fh *fh = priv;
345	struct most_video_dev *mdev = fh->mdev;
346	*i = mdev->ctrl_input;
347	return 0;
348	}
349
350	static int vidioc_s_input(struct file file, void priv, unsigned int index)
351	{
352	struct aim_fh *fh = priv;
353	struct most_video_dev *mdev = fh->mdev;
354
355	pr_info("vidioc_s_input(%d)\n", index);
356
357	if (index >= V4L2_AIM_MAX_INPUT)
358	return -EINVAL;
359	mdev->ctrl_input = index;
360	return 0;
361	}
362
363	static struct v4l2_file_operations aim_fops = {
364	.owner = THIS_MODULE,
365	.open = aim_vdev_open,
366	.release = aim_vdev_close,
367	.read = aim_vdev_read,
368	.poll = aim_vdev_poll,
369	.unlocked_ioctl = video_ioctl2,
370	};
371
372	static const struct v4l2_ioctl_ops video_ioctl_ops = {
373	.vidioc_querycap = vidioc_querycap,
374	.vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
375	.vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
376	.vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
377	.vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
378	.vidioc_g_std = vidioc_g_std,
379	.vidioc_enum_input = vidioc_enum_input,
380	.vidioc_g_input = vidioc_g_input,
381	.vidioc_s_input = vidioc_s_input,
382	};
383
384	static const struct video_device aim_videodev_template = {
385	.fops = &aim_fops,
386	.release = video_device_release,
387	.ioctl_ops = &video_ioctl_ops,
388	.tvnorms = V4L2_STD_UNKNOWN,
389	};
390
391	/**************************************************************************/
392
393	static struct most_video_dev *get_aim_dev(
394	struct most_interface *iface, int channel_idx)
395	{
db5a48d5	396	struct most_video_dev *mdev;
e494df03	397	unsigned long flags;
3d31c0cb	398
e494df03	399	spin_lock_irqsave(&list_lock, flags);
db5a48d5	400	list_for_each_entry(mdev, &video_devices, list) {
3d31c0cb	401	if (mdev->iface == iface && mdev->ch_idx == channel_idx) {
e494df03	402	spin_unlock_irqrestore(&list_lock, flags);
3d31c0cb CG	403	return mdev;
	404	}
	405	}
e494df03	406	spin_unlock_irqrestore(&list_lock, flags);
9b532df0	407	return NULL;
3d31c0cb CG	408	}
	409
	410	static int aim_rx_data(struct mbo *mbo)
	411	{
e494df03	412	unsigned long flags;
3d31c0cb CG	413	struct most_video_dev *mdev =
	414	get_aim_dev(mbo->ifp, mbo->hdm_channel_id);
	415
	416	if (!mdev)
	417	return -EIO;
	418
e494df03	419	spin_lock_irqsave(&mdev->list_lock, flags);
3d31c0cb	420	if (unlikely(mdev->mute)) {
e494df03	421	spin_unlock_irqrestore(&mdev->list_lock, flags);
3d31c0cb CG	422	return -EIO;
	423	}
	424
	425	list_add_tail(&mbo->list, &mdev->pending_mbos);
e494df03	426	spin_unlock_irqrestore(&mdev->list_lock, flags);
3d31c0cb CG	427	wake_up_interruptible(&mdev->wait_data);
	428	return 0;
	429	}
	430
	431	static int aim_register_videodev(struct most_video_dev *mdev)
	432	{
	433	int retval = -ENOMEM;
	434	int ret;
	435
	436	pr_info("aim_register_videodev()\n");
	437
	438	init_waitqueue_head(&mdev->wait_data);
	439
	440	/* allocate and fill v4l2 video struct */
	441	mdev->vdev = video_device_alloc();
	442	if (!mdev->vdev)
	443	return -ENOMEM;
	444
	445	/* Fill the video capture device struct */
	446	*mdev->vdev = aim_videodev_template;
	447	mdev->vdev->v4l2_dev = &mdev->v4l2_dev;
	448	mdev->vdev->lock = &mdev->lock;
	449	strcpy(mdev->vdev->name, "most v4l2 aim video");
	450
	451	/* Register the v4l2 device */
	452	video_set_drvdata(mdev->vdev, mdev);
	453	retval = video_register_device(mdev->vdev, VFL_TYPE_GRABBER, -1);
	454	if (retval != 0) {
	455	pr_err("video_register_device failed (%d)\n", retval);
	456	ret = -ENODEV;
	457	goto err_vbi_dev;
	458	}
	459
	460	return 0;
	461
	462	err_vbi_dev:
	463	video_device_release(mdev->vdev);
	464	return ret;
	465	}
	466
	467	static void aim_unregister_videodev(struct most_video_dev *mdev)
	468	{
	469	pr_info("aim_unregister_videodev()\n");
	470
	471	video_unregister_device(mdev->vdev);
	472	}
	473
3d31c0cb CG	474	static void aim_v4l2_dev_release(struct v4l2_device *v4l2_dev)
	475	{
	476	struct most_video_dev *mdev =
	477	container_of(v4l2_dev, struct most_video_dev, v4l2_dev);
	478
	479	v4l2_device_unregister(v4l2_dev);
	480	kfree(mdev);
	481	}
	482
	483	static int aim_probe_channel(struct most_interface *iface, int channel_idx,
	484	struct most_channel_config *ccfg,
	485	struct kobject parent, char name)
	486	{
	487	int ret;
	488	struct most_video_dev *mdev = get_aim_dev(iface, channel_idx);
	489
	490	pr_info("aim_probe_channel()\n");
	491
	492	if (mdev) {
	493	pr_err("channel already linked\n");
	494	return -EEXIST;
	495	}
	496
	497	if (ccfg->direction != MOST_CH_RX) {
	498	pr_err("wrong direction, expect rx\n");
	499	return -EINVAL;
	500	}
	501
	502	if (ccfg->data_type != MOST_CH_SYNC &&
	503	ccfg->data_type != MOST_CH_ISOC_AVP) {
	504	pr_err("wrong channel type, expect sync or isoc_avp\n");
	505	return -EINVAL;
	506	}
	507
	508	mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
	509	if (!mdev)
	510	return -ENOMEM;
	511
	512	mutex_init(&mdev->lock);
	513	atomic_set(&mdev->access_ref, -1);
	514	spin_lock_init(&mdev->list_lock);
	515	INIT_LIST_HEAD(&mdev->pending_mbos);
	516	mdev->iface = iface;
	517	mdev->ch_idx = channel_idx;
	518	mdev->v4l2_dev.release = aim_v4l2_dev_release;
	519
	520	/* Create the v4l2_device */
	521	strlcpy(mdev->v4l2_dev.name, "most_video_device",
	522	sizeof(mdev->v4l2_dev.name));
	523	ret = v4l2_device_register(NULL, &mdev->v4l2_dev);
	524	if (ret) {
	525	pr_err("v4l2_device_register() failed\n");
	526	kfree(mdev);
	527	return ret;
	528	}
	529
	530	ret = aim_register_videodev(mdev);
	531	if (ret)
	532	goto err_unreg;
	533
e494df03	534	spin_lock_irq(&list_lock);
3d31c0cb	535	list_add(&mdev->list, &video_devices);
e494df03	536	spin_unlock_irq(&list_lock);
3d31c0cb CG	537	return 0;
	538
	539	err_unreg:
	540	v4l2_device_disconnect(&mdev->v4l2_dev);
	541	v4l2_device_put(&mdev->v4l2_dev);
	542	return ret;
	543	}
	544
	545	static int aim_disconnect_channel(struct most_interface *iface,
	546	int channel_idx)
	547	{
	548	struct most_video_dev *mdev = get_aim_dev(iface, channel_idx);
	549
	550	pr_info("aim_disconnect_channel()\n");
	551
	552	if (!mdev) {
	553	pr_err("no such channel is linked\n");
	554	return -ENOENT;
	555	}
	556
e494df03	557	spin_lock_irq(&list_lock);
3d31c0cb	558	list_del(&mdev->list);
e494df03	559	spin_unlock_irq(&list_lock);
3d31c0cb CG	560
	561	aim_unregister_videodev(mdev);
	562	v4l2_device_disconnect(&mdev->v4l2_dev);
	563	v4l2_device_put(&mdev->v4l2_dev);
	564	return 0;
	565	}
	566
ec5c00af CG	567	static struct most_aim aim_info = {
	568	.name = "v4l",
	569	.probe_channel = aim_probe_channel,
	570	.disconnect_channel = aim_disconnect_channel,
	571	.rx_completion = aim_rx_data,
	572	};
	573
3d31c0cb CG	574	static int __init aim_init(void)
	575	{
	576	spin_lock_init(&list_lock);
3d31c0cb CG	577	return most_register_aim(&aim_info);
	578	}
	579
	580	static void __exit aim_exit(void)
	581	{
	582	struct most_video_dev mdev, tmp;
	583
	584	/*
	585	* As the mostcore currently doesn't call disconnect_channel()
	586	* for linked channels while we call most_deregister_aim()
	587	* we simulate this call here.
	588	* This must be fixed in core.
	589	*/
e494df03	590	spin_lock_irq(&list_lock);
3d31c0cb CG	591	list_for_each_entry_safe(mdev, tmp, &video_devices, list) {
3d31c0cb CG	592	list_del(&mdev->list);
e494df03	593	spin_unlock_irq(&list_lock);
3d31c0cb CG	594
	595	aim_unregister_videodev(mdev);
	596	v4l2_device_disconnect(&mdev->v4l2_dev);
	597	v4l2_device_put(&mdev->v4l2_dev);
e494df03	598	spin_lock_irq(&list_lock);
3d31c0cb	599	}
e494df03	600	spin_unlock_irq(&list_lock);
3d31c0cb CG	601
	602	most_deregister_aim(&aim_info);
	603	BUG_ON(!list_empty(&video_devices));
	604	}
	605
	606	module_init(aim_init);
	607	module_exit(aim_exit);
	608
	609	MODULE_DESCRIPTION("V4L2 Application Interface Module for MostCore");
	610	MODULE_AUTHOR("Andrey Shvetsov <andrey.shvetsov@k2l.de>");
	611	MODULE_LICENSE("GPL");