mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-26 01:15:38 +07:00
a3620cb48d
Refactor the V4L2 async framework a little in preparation for async sub-device notifiers. This avoids making some structural changes in the patch actually implementing sub-device notifiers, making that patch easier to review. Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Acked-by: Hans Verkuil <hans.verkuil@cisco.com> Acked-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
408 lines
8.8 KiB
C
408 lines
8.8 KiB
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/mm.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/of.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-fwnode.h>
|
|
#include <media/v4l2-subdev.h>
|
|
|
|
static int v4l2_async_notifier_call_bound(struct v4l2_async_notifier *n,
|
|
struct v4l2_subdev *subdev,
|
|
struct v4l2_async_subdev *asd)
|
|
{
|
|
if (!n->ops || !n->ops->bound)
|
|
return 0;
|
|
|
|
return n->ops->bound(n, subdev, asd);
|
|
}
|
|
|
|
static void v4l2_async_notifier_call_unbind(struct v4l2_async_notifier *n,
|
|
struct v4l2_subdev *subdev,
|
|
struct v4l2_async_subdev *asd)
|
|
{
|
|
if (!n->ops || !n->ops->unbind)
|
|
return;
|
|
|
|
n->ops->unbind(n, subdev, asd);
|
|
}
|
|
|
|
static int v4l2_async_notifier_call_complete(struct v4l2_async_notifier *n)
|
|
{
|
|
if (!n->ops || !n->ops->complete)
|
|
return 0;
|
|
|
|
return n->ops->complete(n);
|
|
}
|
|
|
|
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
|
|
}
|
|
|
|
static bool match_devname(struct v4l2_subdev *sd,
|
|
struct v4l2_async_subdev *asd)
|
|
{
|
|
return !strcmp(asd->match.device_name.name, dev_name(sd->dev));
|
|
}
|
|
|
|
static bool match_fwnode(struct v4l2_subdev *sd, struct v4l2_async_subdev *asd)
|
|
{
|
|
return sd->fwnode == asd->match.fwnode.fwnode;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
static LIST_HEAD(subdev_list);
|
|
static LIST_HEAD(notifier_list);
|
|
static DEFINE_MUTEX(list_lock);
|
|
|
|
static struct v4l2_async_subdev *v4l2_async_find_match(
|
|
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, ¬ifier->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_FWNODE:
|
|
match = match_fwnode;
|
|
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;
|
|
}
|
|
|
|
static int v4l2_async_match_notify(struct v4l2_async_notifier *notifier,
|
|
struct v4l2_device *v4l2_dev,
|
|
struct v4l2_subdev *sd,
|
|
struct v4l2_async_subdev *asd)
|
|
{
|
|
int ret;
|
|
|
|
ret = v4l2_device_register_subdev(v4l2_dev, sd);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = v4l2_async_notifier_call_bound(notifier, sd, asd);
|
|
if (ret < 0) {
|
|
v4l2_device_unregister_subdev(sd);
|
|
return ret;
|
|
}
|
|
|
|
/* Remove from the waiting list */
|
|
list_del(&asd->list);
|
|
sd->asd = asd;
|
|
sd->notifier = notifier;
|
|
|
|
/* Move from the global subdevice list to notifier's done */
|
|
list_move(&sd->async_list, ¬ifier->done);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Test all async sub-devices in a notifier for a match. */
|
|
static int v4l2_async_notifier_try_all_subdevs(
|
|
struct v4l2_async_notifier *notifier)
|
|
{
|
|
struct v4l2_device *v4l2_dev = notifier->v4l2_dev;
|
|
struct v4l2_subdev *sd, *tmp;
|
|
|
|
list_for_each_entry_safe(sd, tmp, &subdev_list, async_list) {
|
|
struct v4l2_async_subdev *asd;
|
|
int ret;
|
|
|
|
asd = v4l2_async_find_match(notifier, sd);
|
|
if (!asd)
|
|
continue;
|
|
|
|
ret = v4l2_async_match_notify(notifier, v4l2_dev, sd, asd);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
static void v4l2_async_notifier_unbind_all_subdevs(
|
|
struct v4l2_async_notifier *notifier)
|
|
{
|
|
struct v4l2_subdev *sd, *tmp;
|
|
|
|
list_for_each_entry_safe(sd, tmp, ¬ifier->done, async_list) {
|
|
v4l2_async_notifier_call_unbind(notifier, sd, sd->asd);
|
|
v4l2_async_cleanup(sd);
|
|
|
|
list_move(&sd->async_list, &subdev_list);
|
|
}
|
|
}
|
|
|
|
static int __v4l2_async_notifier_register(struct v4l2_async_notifier *notifier)
|
|
{
|
|
struct v4l2_async_subdev *asd;
|
|
int ret;
|
|
int i;
|
|
|
|
if (notifier->num_subdevs > V4L2_MAX_SUBDEVS)
|
|
return -EINVAL;
|
|
|
|
INIT_LIST_HEAD(¬ifier->waiting);
|
|
INIT_LIST_HEAD(¬ifier->done);
|
|
|
|
if (!notifier->num_subdevs) {
|
|
int ret;
|
|
|
|
ret = v4l2_async_notifier_call_complete(notifier);
|
|
notifier->v4l2_dev = NULL;
|
|
|
|
return ret;
|
|
}
|
|
|
|
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_FWNODE:
|
|
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, ¬ifier->waiting);
|
|
}
|
|
|
|
mutex_lock(&list_lock);
|
|
|
|
ret = v4l2_async_notifier_try_all_subdevs(notifier);
|
|
if (ret) {
|
|
mutex_unlock(&list_lock);
|
|
return ret;
|
|
}
|
|
|
|
if (list_empty(¬ifier->waiting)) {
|
|
ret = v4l2_async_notifier_call_complete(notifier);
|
|
if (ret)
|
|
goto err_complete;
|
|
}
|
|
|
|
/* Keep also completed notifiers on the list */
|
|
list_add(¬ifier->list, ¬ifier_list);
|
|
|
|
mutex_unlock(&list_lock);
|
|
|
|
return 0;
|
|
|
|
err_complete:
|
|
v4l2_async_notifier_unbind_all_subdevs(notifier);
|
|
|
|
mutex_unlock(&list_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int v4l2_async_notifier_register(struct v4l2_device *v4l2_dev,
|
|
struct v4l2_async_notifier *notifier)
|
|
{
|
|
int ret;
|
|
|
|
if (WARN_ON(!v4l2_dev))
|
|
return -EINVAL;
|
|
|
|
notifier->v4l2_dev = v4l2_dev;
|
|
|
|
ret = __v4l2_async_notifier_register(notifier);
|
|
if (ret)
|
|
notifier->v4l2_dev = NULL;
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(v4l2_async_notifier_register);
|
|
|
|
void v4l2_async_notifier_unregister(struct v4l2_async_notifier *notifier)
|
|
{
|
|
if (!notifier->v4l2_dev)
|
|
return;
|
|
|
|
mutex_lock(&list_lock);
|
|
|
|
list_del(¬ifier->list);
|
|
|
|
v4l2_async_notifier_unbind_all_subdevs(notifier);
|
|
|
|
mutex_unlock(&list_lock);
|
|
|
|
notifier->v4l2_dev = NULL;
|
|
}
|
|
EXPORT_SYMBOL(v4l2_async_notifier_unregister);
|
|
|
|
void v4l2_async_notifier_cleanup(struct v4l2_async_notifier *notifier)
|
|
{
|
|
unsigned int i;
|
|
|
|
if (!notifier->max_subdevs)
|
|
return;
|
|
|
|
for (i = 0; i < notifier->num_subdevs; i++) {
|
|
struct v4l2_async_subdev *asd = notifier->subdevs[i];
|
|
|
|
switch (asd->match_type) {
|
|
case V4L2_ASYNC_MATCH_FWNODE:
|
|
fwnode_handle_put(asd->match.fwnode.fwnode);
|
|
break;
|
|
default:
|
|
WARN_ON_ONCE(true);
|
|
break;
|
|
}
|
|
|
|
kfree(asd);
|
|
}
|
|
|
|
notifier->max_subdevs = 0;
|
|
notifier->num_subdevs = 0;
|
|
|
|
kvfree(notifier->subdevs);
|
|
notifier->subdevs = NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(v4l2_async_notifier_cleanup);
|
|
|
|
int v4l2_async_register_subdev(struct v4l2_subdev *sd)
|
|
{
|
|
struct v4l2_async_notifier *notifier;
|
|
int ret;
|
|
|
|
/*
|
|
* 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->fwnode && sd->dev)
|
|
sd->fwnode = dev_fwnode(sd->dev);
|
|
|
|
mutex_lock(&list_lock);
|
|
|
|
INIT_LIST_HEAD(&sd->async_list);
|
|
|
|
list_for_each_entry(notifier, ¬ifier_list, list) {
|
|
struct v4l2_async_subdev *asd = v4l2_async_find_match(notifier,
|
|
sd);
|
|
int ret;
|
|
|
|
if (!asd)
|
|
continue;
|
|
|
|
ret = v4l2_async_match_notify(notifier, notifier->v4l2_dev, sd,
|
|
asd);
|
|
if (ret)
|
|
goto err_unlock;
|
|
|
|
if (!list_empty(¬ifier->waiting))
|
|
goto out_unlock;
|
|
|
|
ret = v4l2_async_notifier_call_complete(notifier);
|
|
if (ret)
|
|
goto err_cleanup;
|
|
|
|
goto out_unlock;
|
|
}
|
|
|
|
/* None matched, wait for hot-plugging */
|
|
list_add(&sd->async_list, &subdev_list);
|
|
|
|
out_unlock:
|
|
mutex_unlock(&list_lock);
|
|
|
|
return 0;
|
|
|
|
err_cleanup:
|
|
v4l2_async_notifier_call_unbind(notifier, sd, sd->asd);
|
|
v4l2_async_cleanup(sd);
|
|
|
|
err_unlock:
|
|
mutex_unlock(&list_lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(v4l2_async_register_subdev);
|
|
|
|
void v4l2_async_unregister_subdev(struct v4l2_subdev *sd)
|
|
{
|
|
mutex_lock(&list_lock);
|
|
|
|
if (sd->asd) {
|
|
struct v4l2_async_notifier *notifier = sd->notifier;
|
|
|
|
list_add(&sd->asd->list, ¬ifier->waiting);
|
|
|
|
v4l2_async_notifier_call_unbind(notifier, sd, sd->asd);
|
|
}
|
|
|
|
v4l2_async_cleanup(sd);
|
|
|
|
mutex_unlock(&list_lock);
|
|
}
|
|
EXPORT_SYMBOL(v4l2_async_unregister_subdev);
|