blob: 3ec323bd528b161e156284f35f43e006196fff71 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-only
/*
* V4L2 asynchronous subdevice registration API
*
* Copyright (C) 2012-2013, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
*/
#include <linux/debugfs.h>
#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/seq_file.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>
#include "v4l2-subdev-priv.h"
static int v4l2_async_nf_call_bound(struct v4l2_async_notifier *n,
struct v4l2_subdev *subdev,
struct v4l2_async_connection *asc)
{
if (!n->ops || !n->ops->bound)
return 0;
return n->ops->bound(n, subdev, asc);
}
static void v4l2_async_nf_call_unbind(struct v4l2_async_notifier *n,
struct v4l2_subdev *subdev,
struct v4l2_async_connection *asc)
{
if (!n->ops || !n->ops->unbind)
return;
n->ops->unbind(n, subdev, asc);
}
static int v4l2_async_nf_call_complete(struct v4l2_async_notifier *n)
{
if (!n->ops || !n->ops->complete)
return 0;
return n->ops->complete(n);
}
static void v4l2_async_nf_call_destroy(struct v4l2_async_notifier *n,
struct v4l2_async_connection *asc)
{
if (!n->ops || !n->ops->destroy)
return;
n->ops->destroy(asc);
}
static bool match_i2c(struct v4l2_async_notifier *notifier,
struct v4l2_subdev *sd,
struct v4l2_async_match_desc *match)
{
#if IS_ENABLED(CONFIG_I2C)
struct i2c_client *client = i2c_verify_client(sd->dev);
return client &&
match->i2c.adapter_id == client->adapter->nr &&
match->i2c.address == client->addr;
#else
return false;
#endif
}
static struct device *notifier_dev(struct v4l2_async_notifier *notifier)
{
if (notifier->sd)
return notifier->sd->dev;
if (notifier->v4l2_dev)
return notifier->v4l2_dev->dev;
return NULL;
}
static bool
match_fwnode_one(struct v4l2_async_notifier *notifier,
struct v4l2_subdev *sd, struct fwnode_handle *sd_fwnode,
struct v4l2_async_match_desc *match)
{
struct fwnode_handle *asd_dev_fwnode;
bool ret;
dev_dbg(notifier_dev(notifier),
"v4l2-async: fwnode match: need %pfw, trying %pfw\n",
sd_fwnode, match->fwnode);
if (sd_fwnode == match->fwnode) {
dev_dbg(notifier_dev(notifier),
"v4l2-async: direct match found\n");
return true;
}
if (!fwnode_graph_is_endpoint(match->fwnode)) {
dev_dbg(notifier_dev(notifier),
"v4l2-async: direct match not found\n");
return false;
}
asd_dev_fwnode = fwnode_graph_get_port_parent(match->fwnode);
ret = sd_fwnode == asd_dev_fwnode;
fwnode_handle_put(asd_dev_fwnode);
dev_dbg(notifier_dev(notifier),
"v4l2-async: device--endpoint match %sfound\n",
ret ? "" : "not ");
return ret;
}
static bool match_fwnode(struct v4l2_async_notifier *notifier,
struct v4l2_subdev *sd,
struct v4l2_async_match_desc *match)
{
dev_dbg(notifier_dev(notifier),
"v4l2-async: matching for notifier %pfw, sd fwnode %pfw\n",
dev_fwnode(notifier_dev(notifier)), sd->fwnode);
if (!list_empty(&sd->async_subdev_endpoint_list)) {
struct v4l2_async_subdev_endpoint *ase;
dev_dbg(sd->dev,
"v4l2-async: endpoint fwnode list available, looking for %pfw\n",
match->fwnode);
list_for_each_entry(ase, &sd->async_subdev_endpoint_list,
async_subdev_endpoint_entry) {
bool matched = ase->endpoint == match->fwnode;
dev_dbg(sd->dev,
"v4l2-async: endpoint-endpoint match %sfound with %pfw\n",
matched ? "" : "not ", ase->endpoint);
if (matched)
return true;
}
dev_dbg(sd->dev, "async: no endpoint matched\n");
return false;
}
if (match_fwnode_one(notifier, sd, sd->fwnode, match))
return true;
/* Also check the secondary fwnode. */
if (IS_ERR_OR_NULL(sd->fwnode->secondary))
return false;
dev_dbg(notifier_dev(notifier),
"v4l2-async: trying secondary fwnode match\n");
return match_fwnode_one(notifier, sd, sd->fwnode->secondary, match);
}
static LIST_HEAD(subdev_list);
static LIST_HEAD(notifier_list);
static DEFINE_MUTEX(list_lock);
static struct v4l2_async_connection *
v4l2_async_find_match(struct v4l2_async_notifier *notifier,
struct v4l2_subdev *sd)
{
bool (*match)(struct v4l2_async_notifier *notifier,
struct v4l2_subdev *sd,
struct v4l2_async_match_desc *match);
struct v4l2_async_connection *asc;
list_for_each_entry(asc, &notifier->waiting_list, asc_entry) {
/* bus_type has been verified valid before */
switch (asc->match.type) {
case V4L2_ASYNC_MATCH_TYPE_I2C:
match = match_i2c;
break;
case V4L2_ASYNC_MATCH_TYPE_FWNODE:
match = match_fwnode;
break;
default:
/* Cannot happen, unless someone breaks us */
WARN_ON(true);
return NULL;
}
/* match cannot be NULL here */
if (match(notifier, sd, &asc->match))
return asc;
}
return NULL;
}
/* Compare two async match descriptors for equivalence */
static bool v4l2_async_match_equal(struct v4l2_async_match_desc *match1,
struct v4l2_async_match_desc *match2)
{
if (match1->type != match2->type)
return false;
switch (match1->type) {
case V4L2_ASYNC_MATCH_TYPE_I2C:
return match1->i2c.adapter_id == match2->i2c.adapter_id &&
match1->i2c.address == match2->i2c.address;
case V4L2_ASYNC_MATCH_TYPE_FWNODE:
return match1->fwnode == match2->fwnode;
default:
break;
}
return false;
}
/* Find the sub-device notifier registered by a sub-device driver. */
static struct v4l2_async_notifier *
v4l2_async_find_subdev_notifier(struct v4l2_subdev *sd)
{
struct v4l2_async_notifier *n;
list_for_each_entry(n, &notifier_list, notifier_entry)
if (n->sd == sd)
return n;
return NULL;
}
/* Get v4l2_device related to the notifier if one can be found. */
static struct v4l2_device *
v4l2_async_nf_find_v4l2_dev(struct v4l2_async_notifier *notifier)
{
while (notifier->parent)
notifier = notifier->parent;
return notifier->v4l2_dev;
}
/*
* Return true if all child sub-device notifiers are complete, false otherwise.
*/
static bool
v4l2_async_nf_can_complete(struct v4l2_async_notifier *notifier)
{
struct v4l2_async_connection *asc;
if (!list_empty(&notifier->waiting_list))
return false;
list_for_each_entry(asc, &notifier->done_list, asc_entry) {
struct v4l2_async_notifier *subdev_notifier =
v4l2_async_find_subdev_notifier(asc->sd);
if (subdev_notifier &&
!v4l2_async_nf_can_complete(subdev_notifier))
return false;
}
return true;
}
/*
* Complete the master notifier if possible. This is done when all async
* sub-devices have been bound; v4l2_device is also available then.
*/
static int
v4l2_async_nf_try_complete(struct v4l2_async_notifier *notifier)
{
struct v4l2_async_notifier *__notifier = notifier;
/* Quick check whether there are still more sub-devices here. */
if (!list_empty(&notifier->waiting_list))
return 0;
if (notifier->sd)
dev_dbg(notifier_dev(notifier),
"v4l2-async: trying to complete\n");
/* Check the entire notifier tree; find the root notifier first. */
while (notifier->parent)
notifier = notifier->parent;
/* This is root if it has v4l2_dev. */
if (!notifier->v4l2_dev) {
dev_dbg(notifier_dev(__notifier),
"v4l2-async: V4L2 device not available\n");
return 0;
}
/* Is everything ready? */
if (!v4l2_async_nf_can_complete(notifier))
return 0;
dev_dbg(notifier_dev(__notifier), "v4l2-async: complete\n");
return v4l2_async_nf_call_complete(notifier);
}
static int
v4l2_async_nf_try_all_subdevs(struct v4l2_async_notifier *notifier);
static int v4l2_async_create_ancillary_links(struct v4l2_async_notifier *n,
struct v4l2_subdev *sd)
{
struct media_link *link = NULL;
#if IS_ENABLED(CONFIG_MEDIA_CONTROLLER)
if (sd->entity.function != MEDIA_ENT_F_LENS &&
sd->entity.function != MEDIA_ENT_F_FLASH)
return 0;
link = media_create_ancillary_link(&n->sd->entity, &sd->entity);
#endif
return IS_ERR(link) ? PTR_ERR(link) : 0;
}
static int v4l2_async_match_notify(struct v4l2_async_notifier *notifier,
struct v4l2_device *v4l2_dev,
struct v4l2_subdev *sd,
struct v4l2_async_connection *asc)
{
struct v4l2_async_notifier *subdev_notifier;
bool registered = false;
int ret;
if (list_empty(&sd->asc_list)) {
ret = v4l2_device_register_subdev(v4l2_dev, sd);
if (ret < 0)
return ret;
registered = true;
}
ret = v4l2_async_nf_call_bound(notifier, sd, asc);
if (ret < 0) {
if (asc->match.type == V4L2_ASYNC_MATCH_TYPE_FWNODE)
dev_dbg(notifier_dev(notifier),
"failed binding %pfw (%d)\n",
asc->match.fwnode, ret);
goto err_unregister_subdev;
}
if (registered) {
/*
* Depending of the function of the entities involved, we may
* want to create links between them (for example between a
* sensor and its lens or between a sensor's source pad and the
* connected device's sink pad).
*/
ret = v4l2_async_create_ancillary_links(notifier, sd);
if (ret) {
if (asc->match.type == V4L2_ASYNC_MATCH_TYPE_FWNODE)
dev_dbg(notifier_dev(notifier),
"failed creating links for %pfw (%d)\n",
asc->match.fwnode, ret);
goto err_call_unbind;
}
}
list_add(&asc->asc_subdev_entry, &sd->asc_list);
asc->sd = sd;
/* Move from the waiting list to notifier's done */
list_move(&asc->asc_entry, &notifier->done_list);
dev_dbg(notifier_dev(notifier), "v4l2-async: %s bound (ret %d)\n",
dev_name(sd->dev), ret);
/*
* See if the sub-device has a notifier. If not, return here.
*/
subdev_notifier = v4l2_async_find_subdev_notifier(sd);
if (!subdev_notifier || subdev_notifier->parent)
return 0;
/*
* Proceed with checking for the sub-device notifier's async
* sub-devices, and return the result. The error will be handled by the
* caller.
*/
subdev_notifier->parent = notifier;
return v4l2_async_nf_try_all_subdevs(subdev_notifier);
err_call_unbind:
v4l2_async_nf_call_unbind(notifier, sd, asc);
list_del(&asc->asc_subdev_entry);
err_unregister_subdev:
if (registered)
v4l2_device_unregister_subdev(sd);
return ret;
}
/* Test all async sub-devices in a notifier for a match. */
static int
v4l2_async_nf_try_all_subdevs(struct v4l2_async_notifier *notifier)
{
struct v4l2_device *v4l2_dev =
v4l2_async_nf_find_v4l2_dev(notifier);
struct v4l2_subdev *sd;
if (!v4l2_dev)
return 0;
dev_dbg(notifier_dev(notifier), "v4l2-async: trying all sub-devices\n");
again:
list_for_each_entry(sd, &subdev_list, async_list) {
struct v4l2_async_connection *asc;
int ret;
asc = v4l2_async_find_match(notifier, sd);
if (!asc)
continue;
dev_dbg(notifier_dev(notifier),
"v4l2-async: match found, subdev %s\n", sd->name);
ret = v4l2_async_match_notify(notifier, v4l2_dev, sd, asc);
if (ret < 0)
return ret;
/*
* v4l2_async_match_notify() may lead to registering a
* new notifier and thus changing the async subdevs
* list. In order to proceed safely from here, restart
* parsing the list from the beginning.
*/
goto again;
}
return 0;
}
static void v4l2_async_unbind_subdev_one(struct v4l2_async_notifier *notifier,
struct v4l2_async_connection *asc)
{
list_move_tail(&asc->asc_entry, &notifier->waiting_list);
if (list_is_singular(&asc->asc_subdev_entry)) {
v4l2_async_nf_call_unbind(notifier, asc->sd, asc);
v4l2_device_unregister_subdev(asc->sd);
asc->sd = NULL;
}
list_del(&asc->asc_subdev_entry);
}
/* Unbind all sub-devices in the notifier tree. */
static void
v4l2_async_nf_unbind_all_subdevs(struct v4l2_async_notifier *notifier)
{
struct v4l2_async_connection *asc, *asc_tmp;
list_for_each_entry_safe(asc, asc_tmp, &notifier->done_list,
asc_entry) {
struct v4l2_async_notifier *subdev_notifier =
v4l2_async_find_subdev_notifier(asc->sd);
if (subdev_notifier)
v4l2_async_nf_unbind_all_subdevs(subdev_notifier);
v4l2_async_unbind_subdev_one(notifier, asc);
}
notifier->parent = NULL;
}
/* See if an async sub-device can be found in a notifier's lists. */
static bool
v4l2_async_nf_has_async_match_entry(struct v4l2_async_notifier *notifier,
struct v4l2_async_match_desc *match)
{
struct v4l2_async_connection *asc;
list_for_each_entry(asc, &notifier->waiting_list, asc_entry)
if (v4l2_async_match_equal(&asc->match, match))
return true;
list_for_each_entry(asc, &notifier->done_list, asc_entry)
if (v4l2_async_match_equal(&asc->match, match))
return true;
return false;
}
/*
* Find out whether an async sub-device was set up already or whether it exists
* in a given notifier.
*/
static bool
v4l2_async_nf_has_async_match(struct v4l2_async_notifier *notifier,
struct v4l2_async_match_desc *match)
{
struct list_head *heads[] = {
&notifier->waiting_list,
&notifier->done_list,
};
unsigned int i;
lockdep_assert_held(&list_lock);
/* Check that an asd is not being added more than once. */
for (i = 0; i < ARRAY_SIZE(heads); i++) {
struct v4l2_async_connection *asc;
list_for_each_entry(asc, heads[i], asc_entry) {
if (&asc->match == match)
continue;
if (v4l2_async_match_equal(&asc->match, match))
return true;
}
}
/* Check that an asc does not exist in other notifiers. */
list_for_each_entry(notifier, &notifier_list, notifier_entry)
if (v4l2_async_nf_has_async_match_entry(notifier, match))
return true;
return false;
}
static int v4l2_async_nf_match_valid(struct v4l2_async_notifier *notifier,
struct v4l2_async_match_desc *match)
{
struct device *dev = notifier_dev(notifier);
switch (match->type) {
case V4L2_ASYNC_MATCH_TYPE_I2C:
case V4L2_ASYNC_MATCH_TYPE_FWNODE:
if (v4l2_async_nf_has_async_match(notifier, match)) {
dev_dbg(dev, "v4l2-async: match descriptor already listed in a notifier\n");
return -EEXIST;
}
break;
default:
dev_err(dev, "v4l2-async: Invalid match type %u on %p\n",
match->type, match);
return -EINVAL;
}
return 0;
}
void v4l2_async_nf_init(struct v4l2_async_notifier *notifier,
struct v4l2_device *v4l2_dev)
{
INIT_LIST_HEAD(&notifier->waiting_list);
INIT_LIST_HEAD(&notifier->done_list);
notifier->v4l2_dev = v4l2_dev;
}
EXPORT_SYMBOL(v4l2_async_nf_init);
void v4l2_async_subdev_nf_init(struct v4l2_async_notifier *notifier,
struct v4l2_subdev *sd)
{
INIT_LIST_HEAD(&notifier->waiting_list);
INIT_LIST_HEAD(&notifier->done_list);
notifier->sd = sd;
}
EXPORT_SYMBOL_GPL(v4l2_async_subdev_nf_init);
static int __v4l2_async_nf_register(struct v4l2_async_notifier *notifier)
{
struct v4l2_async_connection *asc;
int ret;
mutex_lock(&list_lock);
list_for_each_entry(asc, &notifier->waiting_list, asc_entry) {
ret = v4l2_async_nf_match_valid(notifier, &asc->match);
if (ret)
goto err_unlock;
}
ret = v4l2_async_nf_try_all_subdevs(notifier);
if (ret < 0)
goto err_unbind;
ret = v4l2_async_nf_try_complete(notifier);
if (ret < 0)
goto err_unbind;
/* Keep also completed notifiers on the list */
list_add(&notifier->notifier_entry, &notifier_list);
mutex_unlock(&list_lock);
return 0;
err_unbind:
/*
* On failure, unbind all sub-devices registered through this notifier.
*/
v4l2_async_nf_unbind_all_subdevs(notifier);
err_unlock:
mutex_unlock(&list_lock);
return ret;
}
int v4l2_async_nf_register(struct v4l2_async_notifier *notifier)
{
int ret;
if (WARN_ON(!notifier->v4l2_dev == !notifier->sd))
return -EINVAL;
ret = __v4l2_async_nf_register(notifier);
if (ret)
notifier->v4l2_dev = NULL;
return ret;
}
EXPORT_SYMBOL(v4l2_async_nf_register);
static void
__v4l2_async_nf_unregister(struct v4l2_async_notifier *notifier)
{
if (!notifier || (!notifier->v4l2_dev && !notifier->sd))
return;
v4l2_async_nf_unbind_all_subdevs(notifier);
list_del(&notifier->notifier_entry);
}
void v4l2_async_nf_unregister(struct v4l2_async_notifier *notifier)
{
mutex_lock(&list_lock);
__v4l2_async_nf_unregister(notifier);
mutex_unlock(&list_lock);
}
EXPORT_SYMBOL(v4l2_async_nf_unregister);
static void __v4l2_async_nf_cleanup(struct v4l2_async_notifier *notifier)
{
struct v4l2_async_connection *asc, *tmp;
if (!notifier || !notifier->waiting_list.next)
return;
WARN_ON(!list_empty(&notifier->done_list));
list_for_each_entry_safe(asc, tmp, &notifier->waiting_list, asc_entry) {
list_del(&asc->asc_entry);
v4l2_async_nf_call_destroy(notifier, asc);
if (asc->match.type == V4L2_ASYNC_MATCH_TYPE_FWNODE)
fwnode_handle_put(asc->match.fwnode);
kfree(asc);
}
notifier->sd = NULL;
notifier->v4l2_dev = NULL;
}
void v4l2_async_nf_cleanup(struct v4l2_async_notifier *notifier)
{
mutex_lock(&list_lock);
__v4l2_async_nf_cleanup(notifier);
mutex_unlock(&list_lock);
}
EXPORT_SYMBOL_GPL(v4l2_async_nf_cleanup);
static void __v4l2_async_nf_add_connection(struct v4l2_async_notifier *notifier,
struct v4l2_async_connection *asc)
{
mutex_lock(&list_lock);
list_add_tail(&asc->asc_entry, &notifier->waiting_list);
mutex_unlock(&list_lock);
}
struct v4l2_async_connection *
__v4l2_async_nf_add_fwnode(struct v4l2_async_notifier *notifier,
struct fwnode_handle *fwnode,
unsigned int asc_struct_size)
{
struct v4l2_async_connection *asc;
asc = kzalloc(asc_struct_size, GFP_KERNEL);
if (!asc)
return ERR_PTR(-ENOMEM);
asc->notifier = notifier;
asc->match.type = V4L2_ASYNC_MATCH_TYPE_FWNODE;
asc->match.fwnode = fwnode_handle_get(fwnode);
__v4l2_async_nf_add_connection(notifier, asc);
return asc;
}
EXPORT_SYMBOL_GPL(__v4l2_async_nf_add_fwnode);
struct v4l2_async_connection *
__v4l2_async_nf_add_fwnode_remote(struct v4l2_async_notifier *notif,
struct fwnode_handle *endpoint,
unsigned int asc_struct_size)
{
struct v4l2_async_connection *asc;
struct fwnode_handle *remote;
remote = fwnode_graph_get_remote_endpoint(endpoint);
if (!remote)
return ERR_PTR(-ENOTCONN);
asc = __v4l2_async_nf_add_fwnode(notif, remote, asc_struct_size);
/*
* Calling __v4l2_async_nf_add_fwnode grabs a refcount,
* so drop the one we got in fwnode_graph_get_remote_port_parent.
*/
fwnode_handle_put(remote);
return asc;
}
EXPORT_SYMBOL_GPL(__v4l2_async_nf_add_fwnode_remote);
struct v4l2_async_connection *
__v4l2_async_nf_add_i2c(struct v4l2_async_notifier *notifier, int adapter_id,
unsigned short address, unsigned int asc_struct_size)
{
struct v4l2_async_connection *asc;
asc = kzalloc(asc_struct_size, GFP_KERNEL);
if (!asc)
return ERR_PTR(-ENOMEM);
asc->notifier = notifier;
asc->match.type = V4L2_ASYNC_MATCH_TYPE_I2C;
asc->match.i2c.adapter_id = adapter_id;
asc->match.i2c.address = address;
__v4l2_async_nf_add_connection(notifier, asc);
return asc;
}
EXPORT_SYMBOL_GPL(__v4l2_async_nf_add_i2c);
int v4l2_async_subdev_endpoint_add(struct v4l2_subdev *sd,
struct fwnode_handle *fwnode)
{
struct v4l2_async_subdev_endpoint *ase;
ase = kmalloc(sizeof(*ase), GFP_KERNEL);
if (!ase)
return -ENOMEM;
ase->endpoint = fwnode;
list_add(&ase->async_subdev_endpoint_entry,
&sd->async_subdev_endpoint_list);
return 0;
}
EXPORT_SYMBOL_GPL(v4l2_async_subdev_endpoint_add);
struct v4l2_async_connection *
v4l2_async_connection_unique(struct v4l2_subdev *sd)
{
if (!list_is_singular(&sd->asc_list))
return NULL;
return list_first_entry(&sd->asc_list,
struct v4l2_async_connection, asc_subdev_entry);
}
EXPORT_SYMBOL_GPL(v4l2_async_connection_unique);
int v4l2_async_register_subdev(struct v4l2_subdev *sd)
{
struct v4l2_async_notifier *subdev_notifier;
struct v4l2_async_notifier *notifier;
struct v4l2_async_connection *asc;
int ret;
INIT_LIST_HEAD(&sd->asc_list);
/*
* 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.
*
* The async sub-device shall always be registered for its device node,
* not the endpoint node.
*/
if (!sd->fwnode && sd->dev) {
sd->fwnode = dev_fwnode(sd->dev);
} else if (fwnode_graph_is_endpoint(sd->fwnode)) {
dev_warn(sd->dev, "sub-device fwnode is an endpoint!\n");
return -EINVAL;
}
mutex_lock(&list_lock);
list_for_each_entry(notifier, &notifier_list, notifier_entry) {
struct v4l2_device *v4l2_dev =
v4l2_async_nf_find_v4l2_dev(notifier);
if (!v4l2_dev)
continue;
while ((asc = v4l2_async_find_match(notifier, sd))) {
ret = v4l2_async_match_notify(notifier, v4l2_dev, sd,
asc);
if (ret)
goto err_unbind;
ret = v4l2_async_nf_try_complete(notifier);
if (ret)
goto err_unbind;
}
}
/* None matched, wait for hot-plugging */
list_add(&sd->async_list, &subdev_list);
mutex_unlock(&list_lock);
return 0;
err_unbind:
/*
* Complete failed. Unbind the sub-devices bound through registering
* this async sub-device.
*/
subdev_notifier = v4l2_async_find_subdev_notifier(sd);
if (subdev_notifier)
v4l2_async_nf_unbind_all_subdevs(subdev_notifier);
if (asc)
v4l2_async_unbind_subdev_one(notifier, asc);
mutex_unlock(&list_lock);
return ret;
}
EXPORT_SYMBOL(v4l2_async_register_subdev);
void v4l2_async_unregister_subdev(struct v4l2_subdev *sd)
{
struct v4l2_async_connection *asc, *asc_tmp;
if (!sd->async_list.next)
return;
v4l2_subdev_put_privacy_led(sd);
mutex_lock(&list_lock);
__v4l2_async_nf_unregister(sd->subdev_notifier);
__v4l2_async_nf_cleanup(sd->subdev_notifier);
kfree(sd->subdev_notifier);
sd->subdev_notifier = NULL;
if (sd->asc_list.next) {
list_for_each_entry_safe(asc, asc_tmp, &sd->asc_list,
asc_subdev_entry) {
v4l2_async_unbind_subdev_one(asc->notifier, asc);
}
}
list_del(&sd->async_list);
sd->async_list.next = NULL;
mutex_unlock(&list_lock);
}
EXPORT_SYMBOL(v4l2_async_unregister_subdev);
static void print_waiting_match(struct seq_file *s,
struct v4l2_async_match_desc *match)
{
switch (match->type) {
case V4L2_ASYNC_MATCH_TYPE_I2C:
seq_printf(s, " [i2c] dev=%d-%04x\n", match->i2c.adapter_id,
match->i2c.address);
break;
case V4L2_ASYNC_MATCH_TYPE_FWNODE: {
struct fwnode_handle *devnode, *fwnode = match->fwnode;
devnode = fwnode_graph_is_endpoint(fwnode) ?
fwnode_graph_get_port_parent(fwnode) :
fwnode_handle_get(fwnode);
seq_printf(s, " [fwnode] dev=%s, node=%pfw\n",
devnode->dev ? dev_name(devnode->dev) : "nil",
fwnode);
fwnode_handle_put(devnode);
break;
}
}
}
static const char *
v4l2_async_nf_name(struct v4l2_async_notifier *notifier)
{
if (notifier->v4l2_dev)
return notifier->v4l2_dev->name;
else if (notifier->sd)
return notifier->sd->name;
else
return "nil";
}
static int pending_subdevs_show(struct seq_file *s, void *data)
{
struct v4l2_async_notifier *notif;
struct v4l2_async_connection *asc;
mutex_lock(&list_lock);
list_for_each_entry(notif, &notifier_list, notifier_entry) {
seq_printf(s, "%s:\n", v4l2_async_nf_name(notif));
list_for_each_entry(asc, &notif->waiting_list, asc_entry)
print_waiting_match(s, &asc->match);
}
mutex_unlock(&list_lock);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(pending_subdevs);
static struct dentry *v4l2_async_debugfs_dir;
static int __init v4l2_async_init(void)
{
v4l2_async_debugfs_dir = debugfs_create_dir("v4l2-async", NULL);
debugfs_create_file("pending_async_subdevices", 0444,
v4l2_async_debugfs_dir, NULL,
&pending_subdevs_fops);
return 0;
}
static void __exit v4l2_async_exit(void)
{
debugfs_remove_recursive(v4l2_async_debugfs_dir);
}
subsys_initcall(v4l2_async_init);
module_exit(v4l2_async_exit);
MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
MODULE_AUTHOR("Sakari Ailus <sakari.ailus@linux.intel.com>");
MODULE_AUTHOR("Ezequiel Garcia <ezequiel@collabora.com>");
MODULE_LICENSE("GPL");