Release 4.7 drivers/media/v4l2-core/v4l2-async.c

/*
 * V4L2 asynchronous subdevice registration API
 *
 * Copyright (C) 2012-2013, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/device.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/types.h>

#include <media/v4l2-async.h>
#include <media/v4l2-device.h>
#include <media/v4l2-subdev.h>



static bool match_i2c(struct v4l2_subdev *sd, struct v4l2_async_subdev *asd)
{
#if IS_ENABLED(CONFIG_I2C)
	struct i2c_client *client = i2c_verify_client(sd->dev);
	return client &&
		asd->match.i2c.adapter_id == client->adapter->nr &&
		asd->match.i2c.address == client->addr;
#else
	return false;
#endif
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
guennadi liakhovetski
guennadi liakhovetski
66
94.29%
2
66.67%
sakari ailus
sakari ailus
4
5.71%
1
33.33%
Total
70
100.00%
3
100.00%



static bool match_devname(struct v4l2_subdev *sd,
			  struct v4l2_async_subdev *asd)
{
	return !strcmp(asd->match.device_name.name, dev_name(sd->dev));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
guennadi liakhovetski
guennadi liakhovetski
30
83.33%
1
33.33%
sakari ailus
sakari ailus
4
11.11%
1
33.33%
sylwester nawrocki
sylwester nawrocki
2
5.56%
1
33.33%
Total
36
100.00%
3
100.00%



static bool match_of(struct v4l2_subdev *sd, struct v4l2_async_subdev *asd)
{
	return sd->of_node == asd->match.of.node;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
sylwester nawrocki
sylwester nawrocki
26
89.66%
1
50.00%
sakari ailus
sakari ailus
3
10.34%
1
50.00%
Total
29
100.00%
2
100.00%



static bool match_custom(struct v4l2_subdev *sd, struct v4l2_async_subdev *asd)
{
	if (!asd->match.custom.match)
		/* Match always */
		return true;

	return asd->match.custom.match(sd->dev, asd);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
sakari ailus
sakari ailus
47
100.00%
1
100.00%
Total
47
100.00%
1
100.00%

static LIST_HEAD(subdev_list);
static LIST_HEAD(notifier_list);
static DEFINE_MUTEX(list_lock);



static struct v4l2_async_subdev *v4l2_async_belongs(struct v4l2_async_notifier *notifier,
						    struct v4l2_subdev *sd)
{
	bool (*match)(struct v4l2_subdev *, struct v4l2_async_subdev *);
	struct v4l2_async_subdev *asd;

	list_for_each_entry(asd, &notifier->waiting, list) {
		/* bus_type has been verified valid before */
		switch (asd->match_type) {
		case V4L2_ASYNC_MATCH_CUSTOM:
			match = match_custom;
			break;
		case V4L2_ASYNC_MATCH_DEVNAME:
			match = match_devname;
			break;
		case V4L2_ASYNC_MATCH_I2C:
			match = match_i2c;
			break;
		case V4L2_ASYNC_MATCH_OF:
			match = match_of;
			break;
		default:
			/* Cannot happen, unless someone breaks us */
			WARN_ON(true);
			return NULL;
		}

		/* match cannot be NULL here */
		if (match(sd, asd))
			return asd;
	}

	return NULL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
guennadi liakhovetski
guennadi liakhovetski
93
80.87%
1
20.00%
sylwester nawrocki
sylwester nawrocki
15
13.04%
3
60.00%
sakari ailus
sakari ailus
7
6.09%
1
20.00%
Total
115
100.00%
5
100.00%



static int v4l2_async_test_notify(struct v4l2_async_notifier *notifier,
				  struct v4l2_subdev *sd,
				  struct v4l2_async_subdev *asd)
{
	int ret;

	/* Remove from the waiting list */
	list_del(&asd->list);
	sd->asd = asd;
	sd->notifier = notifier;

	if (notifier->bound) {
		ret = notifier->bound(notifier, sd, asd);
		if (ret < 0)
			return ret;
	}
	/* Move from the global subdevice list to notifier's done */
	list_move(&sd->async_list, &notifier->done);

	ret = v4l2_device_register_subdev(notifier->v4l2_dev, sd);
	if (ret < 0) {
		if (notifier->unbind)
			notifier->unbind(notifier, sd, asd);
		return ret;
	}

	ret = v4l2_subdev_call(sd, core, registered_async);
	if (ret < 0 && ret != -ENOIOCTLCMD) {
		if (notifier->unbind)
			notifier->unbind(notifier, sd, asd);
		return ret;
	}

	if (list_empty(&notifier->waiting) && notifier->complete)
		return notifier->complete(notifier);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
guennadi liakhovetski
guennadi liakhovetski
147
74.62%
1
25.00%
javier martinez canillas
javier martinez canillas
44
22.34%
2
50.00%
sylwester nawrocki
sylwester nawrocki
6
3.05%
1
25.00%
Total
197
100.00%
4
100.00%



static void v4l2_async_cleanup(struct v4l2_subdev *sd)
{
	v4l2_device_unregister_subdev(sd);
	/* Subdevice driver will reprobe and put the subdev back onto the list */
	list_del_init(&sd->async_list);
	sd->asd = NULL;
	sd->dev = NULL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
guennadi liakhovetski
guennadi liakhovetski
31
83.78%
1
50.00%
sylwester nawrocki
sylwester nawrocki
6
16.22%
1
50.00%
Total
37
100.00%
2
100.00%



int v4l2_async_notifier_register(struct v4l2_device *v4l2_dev,
				 struct v4l2_async_notifier *notifier)
{
	struct v4l2_subdev *sd, *tmp;
	struct v4l2_async_subdev *asd;
	int i;

	if (!notifier->num_subdevs || notifier->num_subdevs > V4L2_MAX_SUBDEVS)
		return -EINVAL;

	notifier->v4l2_dev = v4l2_dev;
	INIT_LIST_HEAD(&notifier->waiting);
	INIT_LIST_HEAD(&notifier->done);

	for (i = 0; i < notifier->num_subdevs; i++) {
		asd = notifier->subdevs[i];

		switch (asd->match_type) {
		case V4L2_ASYNC_MATCH_CUSTOM:
		case V4L2_ASYNC_MATCH_DEVNAME:
		case V4L2_ASYNC_MATCH_I2C:
		case V4L2_ASYNC_MATCH_OF:
			break;
		default:
			dev_err(notifier->v4l2_dev ? notifier->v4l2_dev->dev : NULL,
				"Invalid match type %u on %p\n",
				asd->match_type, asd);
			return -EINVAL;
		}
		list_add_tail(&asd->list, &notifier->waiting);
	}

	mutex_lock(&list_lock);

	/* Keep also completed notifiers on the list */
	list_add(&notifier->list, &notifier_list);

	list_for_each_entry_safe(sd, tmp, &subdev_list, async_list) {
		int ret;

		asd = v4l2_async_belongs(notifier, sd);
		if (!asd)
			continue;

		ret = v4l2_async_test_notify(notifier, sd, asd);
		if (ret < 0) {
			mutex_unlock(&list_lock);
			return ret;
		}
	}

	mutex_unlock(&list_lock);

	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
guennadi liakhovetski
guennadi liakhovetski
227
93.42%
1
20.00%
sylwester nawrocki
sylwester nawrocki
16
6.58%
4
80.00%
Total
243
100.00%
5
100.00%


EXPORT_SYMBOL(v4l2_async_notifier_register);



void v4l2_async_notifier_unregister(struct v4l2_async_notifier *notifier)
{
	struct v4l2_subdev *sd, *tmp;
	unsigned int notif_n_subdev = notifier->num_subdevs;
	unsigned int n_subdev = min(notif_n_subdev, V4L2_MAX_SUBDEVS);
	struct device **dev;
	int i = 0;

	if (!notifier->v4l2_dev)
		return;

	dev = kmalloc(n_subdev * sizeof(*dev), GFP_KERNEL);
	if (!dev) {
		dev_err(notifier->v4l2_dev->dev,
			"Failed to allocate device cache!\n");
	}

	mutex_lock(&list_lock);

	list_del(&notifier->list);

	list_for_each_entry_safe(sd, tmp, &notifier->done, async_list) {
		struct device *d;

		d = get_device(sd->dev);

		v4l2_async_cleanup(sd);

		/* If we handled USB devices, we'd have to lock the parent too */
		device_release_driver(d);

		if (notifier->unbind)
			notifier->unbind(notifier, sd, sd->asd);

		/*
                 * Store device at the device cache, in order to call
                 * put_device() on the final step
                 */
		if (dev)
			dev[i++] = d;
		else
			put_device(d);
	}

	mutex_unlock(&list_lock);

	/*
         * Call device_attach() to reprobe devices
         *
         * NOTE: If dev allocation fails, i is 0, and the whole loop won't be
         * executed.
         */
	while (i--) {
		struct device *d = dev[i];

		if (d && device_attach(d) < 0) {
			const char *name = "(none)";
			int lock = device_trylock(d);

			if (lock && d->driver)
				name = d->driver->name;
			dev_err(d, "Failed to re-probe to %s\n", name);
			if (lock)
				device_unlock(d);
		}
		put_device(d);
	}
	kfree(dev);

	notifier->v4l2_dev = NULL;

	/*
         * Don't care about the waiting list, it is initialised and populated
         * upon notifier registration.
         */
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
guennadi liakhovetski
guennadi liakhovetski
196
69.75%
1
20.00%
mauro carvalho chehab
mauro carvalho chehab
66
23.49%
1
20.00%
laurent pinchart
laurent pinchart
14
4.98%
1
20.00%
sylwester nawrocki
sylwester nawrocki
5
1.78%
2
40.00%
Total
281
100.00%
5
100.00%


EXPORT_SYMBOL(v4l2_async_notifier_unregister);



int v4l2_async_register_subdev(struct v4l2_subdev *sd)
{
	struct v4l2_async_notifier *notifier;

	/*
         * No reference taken. The reference is held by the device
         * (struct v4l2_subdev.dev), and async sub-device does not
         * exist independently of the device at any point of time.
         */
	if (!sd->of_node && sd->dev)
		sd->of_node = sd->dev->of_node;

	mutex_lock(&list_lock);

	INIT_LIST_HEAD(&sd->async_list);

	list_for_each_entry(notifier, &notifier_list, list) {
		struct v4l2_async_subdev *asd = v4l2_async_belongs(notifier, sd);
		if (asd) {
			int ret = v4l2_async_test_notify(notifier, sd, asd);
			mutex_unlock(&list_lock);
			return ret;
		}
	}

	/* None matched, wait for hot-plugging */
	list_add(&sd->async_list, &subdev_list);

	mutex_unlock(&list_lock);

	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
guennadi liakhovetski
guennadi liakhovetski
93
76.86%
1
33.33%
sakari ailus
sakari ailus
22
18.18%
1
33.33%
sylwester nawrocki
sylwester nawrocki
6
4.96%
1
33.33%
Total
121
100.00%
3
100.00%


EXPORT_SYMBOL(v4l2_async_register_subdev);



void v4l2_async_unregister_subdev(struct v4l2_subdev *sd)
{
	struct v4l2_async_notifier *notifier = sd->notifier;

	if (!sd->asd) {
		if (!list_empty(&sd->async_list))
			v4l2_async_cleanup(sd);
		return;
	}

	mutex_lock(&list_lock);

	list_add(&sd->asd->list, &notifier->waiting);

	v4l2_async_cleanup(sd);

	if (notifier->unbind)
		notifier->unbind(notifier, sd, sd->asd);

	mutex_unlock(&list_lock);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
guennadi liakhovetski
guennadi liakhovetski
89
92.71%
1
50.00%
sylwester nawrocki
sylwester nawrocki
7
7.29%
1
50.00%
Total
96
100.00%
2
100.00%


EXPORT_SYMBOL(v4l2_async_unregister_subdev);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
guennadi liakhovetski
guennadi liakhovetski
1047
77.73%
2
16.67%
sylwester nawrocki
sylwester nawrocki
89
6.61%
5
41.67%
sakari ailus
sakari ailus
87
6.46%
1
8.33%
mauro carvalho chehab
mauro carvalho chehab
66
4.90%
1
8.33%
javier martinez canillas
javier martinez canillas
44
3.27%
2
16.67%
laurent pinchart
laurent pinchart
14
1.04%
1
8.33%
Total
1347
100.00%
12
100.00%
  
Directory: drivers/media/v4l2-core

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.