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861 lines
20 KiB
861 lines
20 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* V4L2 asynchronous subdevice registration API |
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* |
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* Copyright (C) 2012-2013, Guennadi Liakhovetski <[email protected]> |
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*/ |
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|
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#include <linux/debugfs.h> |
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#include <linux/device.h> |
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#include <linux/err.h> |
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#include <linux/i2c.h> |
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#include <linux/list.h> |
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#include <linux/mm.h> |
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#include <linux/module.h> |
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#include <linux/mutex.h> |
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#include <linux/of.h> |
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#include <linux/platform_device.h> |
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#include <linux/seq_file.h> |
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#include <linux/slab.h> |
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#include <linux/types.h> |
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#include <media/v4l2-async.h> |
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#include <media/v4l2-device.h> |
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#include <media/v4l2-fwnode.h> |
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#include <media/v4l2-subdev.h> |
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|
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static int v4l2_async_notifier_call_bound(struct v4l2_async_notifier *n, |
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struct v4l2_subdev *subdev, |
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struct v4l2_async_subdev *asd) |
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{ |
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if (!n->ops || !n->ops->bound) |
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return 0; |
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return n->ops->bound(n, subdev, asd); |
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} |
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static void v4l2_async_notifier_call_unbind(struct v4l2_async_notifier *n, |
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struct v4l2_subdev *subdev, |
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struct v4l2_async_subdev *asd) |
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{ |
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if (!n->ops || !n->ops->unbind) |
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return; |
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n->ops->unbind(n, subdev, asd); |
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} |
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static int v4l2_async_notifier_call_complete(struct v4l2_async_notifier *n) |
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{ |
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if (!n->ops || !n->ops->complete) |
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return 0; |
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return n->ops->complete(n); |
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} |
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static bool match_i2c(struct v4l2_async_notifier *notifier, |
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struct v4l2_subdev *sd, struct v4l2_async_subdev *asd) |
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{ |
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#if IS_ENABLED(CONFIG_I2C) |
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struct i2c_client *client = i2c_verify_client(sd->dev); |
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return client && |
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asd->match.i2c.adapter_id == client->adapter->nr && |
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asd->match.i2c.address == client->addr; |
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#else |
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return false; |
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#endif |
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} |
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static bool match_fwnode(struct v4l2_async_notifier *notifier, |
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struct v4l2_subdev *sd, struct v4l2_async_subdev *asd) |
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{ |
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struct fwnode_handle *other_fwnode; |
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struct fwnode_handle *dev_fwnode; |
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bool asd_fwnode_is_ep; |
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bool sd_fwnode_is_ep; |
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struct device *dev; |
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/* |
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* Both the subdev and the async subdev can provide either an endpoint |
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* fwnode or a device fwnode. Start with the simple case of direct |
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* fwnode matching. |
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*/ |
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if (sd->fwnode == asd->match.fwnode) |
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return true; |
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/* |
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* Check the same situation for any possible secondary assigned to the |
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* subdev's fwnode |
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*/ |
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if (!IS_ERR_OR_NULL(sd->fwnode->secondary) && |
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sd->fwnode->secondary == asd->match.fwnode) |
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return true; |
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|
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/* |
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* Otherwise, check if the sd fwnode and the asd fwnode refer to an |
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* endpoint or a device. If they're of the same type, there's no match. |
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* Technically speaking this checks if the nodes refer to a connected |
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* endpoint, which is the simplest check that works for both OF and |
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* ACPI. This won't make a difference, as drivers should not try to |
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* match unconnected endpoints. |
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*/ |
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sd_fwnode_is_ep = fwnode_graph_is_endpoint(sd->fwnode); |
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asd_fwnode_is_ep = fwnode_graph_is_endpoint(asd->match.fwnode); |
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if (sd_fwnode_is_ep == asd_fwnode_is_ep) |
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return false; |
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/* |
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* The sd and asd fwnodes are of different types. Get the device fwnode |
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* parent of the endpoint fwnode, and compare it with the other fwnode. |
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*/ |
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if (sd_fwnode_is_ep) { |
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dev_fwnode = fwnode_graph_get_port_parent(sd->fwnode); |
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other_fwnode = asd->match.fwnode; |
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} else { |
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dev_fwnode = fwnode_graph_get_port_parent(asd->match.fwnode); |
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other_fwnode = sd->fwnode; |
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} |
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fwnode_handle_put(dev_fwnode); |
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if (dev_fwnode != other_fwnode) |
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return false; |
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/* |
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* We have a heterogeneous match. Retrieve the struct device of the side |
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* that matched on a device fwnode to print its driver name. |
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*/ |
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if (sd_fwnode_is_ep) |
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dev = notifier->v4l2_dev ? notifier->v4l2_dev->dev |
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: notifier->sd->dev; |
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else |
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dev = sd->dev; |
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if (dev && dev->driver) { |
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if (sd_fwnode_is_ep) |
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dev_warn(dev, "Driver %s uses device fwnode, incorrect match may occur\n", |
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dev->driver->name); |
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dev_notice(dev, "Consider updating driver %s to match on endpoints\n", |
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dev->driver->name); |
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} |
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return true; |
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} |
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static LIST_HEAD(subdev_list); |
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static LIST_HEAD(notifier_list); |
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static DEFINE_MUTEX(list_lock); |
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static struct v4l2_async_subdev * |
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v4l2_async_find_match(struct v4l2_async_notifier *notifier, |
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struct v4l2_subdev *sd) |
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{ |
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bool (*match)(struct v4l2_async_notifier *notifier, |
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struct v4l2_subdev *sd, struct v4l2_async_subdev *asd); |
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struct v4l2_async_subdev *asd; |
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list_for_each_entry(asd, ¬ifier->waiting, list) { |
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/* bus_type has been verified valid before */ |
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switch (asd->match_type) { |
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case V4L2_ASYNC_MATCH_I2C: |
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match = match_i2c; |
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break; |
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case V4L2_ASYNC_MATCH_FWNODE: |
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match = match_fwnode; |
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break; |
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default: |
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/* Cannot happen, unless someone breaks us */ |
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WARN_ON(true); |
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return NULL; |
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} |
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/* match cannot be NULL here */ |
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if (match(notifier, sd, asd)) |
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return asd; |
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} |
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return NULL; |
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} |
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/* Compare two async sub-device descriptors for equivalence */ |
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static bool asd_equal(struct v4l2_async_subdev *asd_x, |
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struct v4l2_async_subdev *asd_y) |
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{ |
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if (asd_x->match_type != asd_y->match_type) |
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return false; |
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switch (asd_x->match_type) { |
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case V4L2_ASYNC_MATCH_I2C: |
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return asd_x->match.i2c.adapter_id == |
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asd_y->match.i2c.adapter_id && |
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asd_x->match.i2c.address == |
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asd_y->match.i2c.address; |
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case V4L2_ASYNC_MATCH_FWNODE: |
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return asd_x->match.fwnode == asd_y->match.fwnode; |
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default: |
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break; |
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} |
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return false; |
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} |
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/* Find the sub-device notifier registered by a sub-device driver. */ |
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static struct v4l2_async_notifier * |
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v4l2_async_find_subdev_notifier(struct v4l2_subdev *sd) |
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{ |
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struct v4l2_async_notifier *n; |
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list_for_each_entry(n, ¬ifier_list, list) |
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if (n->sd == sd) |
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return n; |
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return NULL; |
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} |
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/* Get v4l2_device related to the notifier if one can be found. */ |
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static struct v4l2_device * |
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v4l2_async_notifier_find_v4l2_dev(struct v4l2_async_notifier *notifier) |
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{ |
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while (notifier->parent) |
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notifier = notifier->parent; |
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return notifier->v4l2_dev; |
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} |
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/* |
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* Return true if all child sub-device notifiers are complete, false otherwise. |
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*/ |
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static bool |
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v4l2_async_notifier_can_complete(struct v4l2_async_notifier *notifier) |
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{ |
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struct v4l2_subdev *sd; |
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if (!list_empty(¬ifier->waiting)) |
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return false; |
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list_for_each_entry(sd, ¬ifier->done, async_list) { |
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struct v4l2_async_notifier *subdev_notifier = |
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v4l2_async_find_subdev_notifier(sd); |
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if (subdev_notifier && |
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!v4l2_async_notifier_can_complete(subdev_notifier)) |
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return false; |
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} |
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return true; |
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} |
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/* |
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* Complete the master notifier if possible. This is done when all async |
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* sub-devices have been bound; v4l2_device is also available then. |
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*/ |
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static int |
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v4l2_async_notifier_try_complete(struct v4l2_async_notifier *notifier) |
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{ |
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/* Quick check whether there are still more sub-devices here. */ |
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if (!list_empty(¬ifier->waiting)) |
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return 0; |
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/* Check the entire notifier tree; find the root notifier first. */ |
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while (notifier->parent) |
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notifier = notifier->parent; |
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/* This is root if it has v4l2_dev. */ |
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if (!notifier->v4l2_dev) |
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return 0; |
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/* Is everything ready? */ |
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if (!v4l2_async_notifier_can_complete(notifier)) |
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return 0; |
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return v4l2_async_notifier_call_complete(notifier); |
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} |
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static int |
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v4l2_async_notifier_try_all_subdevs(struct v4l2_async_notifier *notifier); |
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static int v4l2_async_match_notify(struct v4l2_async_notifier *notifier, |
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struct v4l2_device *v4l2_dev, |
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struct v4l2_subdev *sd, |
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struct v4l2_async_subdev *asd) |
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{ |
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struct v4l2_async_notifier *subdev_notifier; |
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int ret; |
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ret = v4l2_device_register_subdev(v4l2_dev, sd); |
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if (ret < 0) |
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return ret; |
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ret = v4l2_async_notifier_call_bound(notifier, sd, asd); |
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if (ret < 0) { |
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v4l2_device_unregister_subdev(sd); |
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return ret; |
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} |
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/* Remove from the waiting list */ |
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list_del(&asd->list); |
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sd->asd = asd; |
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sd->notifier = notifier; |
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/* Move from the global subdevice list to notifier's done */ |
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list_move(&sd->async_list, ¬ifier->done); |
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/* |
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* See if the sub-device has a notifier. If not, return here. |
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*/ |
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subdev_notifier = v4l2_async_find_subdev_notifier(sd); |
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if (!subdev_notifier || subdev_notifier->parent) |
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return 0; |
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/* |
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* Proceed with checking for the sub-device notifier's async |
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* sub-devices, and return the result. The error will be handled by the |
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* caller. |
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*/ |
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subdev_notifier->parent = notifier; |
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return v4l2_async_notifier_try_all_subdevs(subdev_notifier); |
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} |
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/* Test all async sub-devices in a notifier for a match. */ |
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static int |
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v4l2_async_notifier_try_all_subdevs(struct v4l2_async_notifier *notifier) |
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{ |
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struct v4l2_device *v4l2_dev = |
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v4l2_async_notifier_find_v4l2_dev(notifier); |
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struct v4l2_subdev *sd; |
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if (!v4l2_dev) |
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return 0; |
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again: |
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list_for_each_entry(sd, &subdev_list, async_list) { |
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struct v4l2_async_subdev *asd; |
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int ret; |
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asd = v4l2_async_find_match(notifier, sd); |
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if (!asd) |
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continue; |
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ret = v4l2_async_match_notify(notifier, v4l2_dev, sd, asd); |
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if (ret < 0) |
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return ret; |
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/* |
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* v4l2_async_match_notify() may lead to registering a |
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* new notifier and thus changing the async subdevs |
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* list. In order to proceed safely from here, restart |
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* parsing the list from the beginning. |
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*/ |
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goto again; |
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} |
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return 0; |
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} |
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static void v4l2_async_cleanup(struct v4l2_subdev *sd) |
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{ |
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v4l2_device_unregister_subdev(sd); |
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/* |
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* Subdevice driver will reprobe and put the subdev back |
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* onto the list |
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*/ |
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list_del_init(&sd->async_list); |
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sd->asd = NULL; |
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} |
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/* Unbind all sub-devices in the notifier tree. */ |
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static void |
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v4l2_async_notifier_unbind_all_subdevs(struct v4l2_async_notifier *notifier) |
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{ |
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struct v4l2_subdev *sd, *tmp; |
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list_for_each_entry_safe(sd, tmp, ¬ifier->done, async_list) { |
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struct v4l2_async_notifier *subdev_notifier = |
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v4l2_async_find_subdev_notifier(sd); |
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if (subdev_notifier) |
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v4l2_async_notifier_unbind_all_subdevs(subdev_notifier); |
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v4l2_async_notifier_call_unbind(notifier, sd, sd->asd); |
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v4l2_async_cleanup(sd); |
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list_move(&sd->async_list, &subdev_list); |
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} |
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notifier->parent = NULL; |
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} |
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/* See if an async sub-device can be found in a notifier's lists. */ |
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static bool |
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__v4l2_async_notifier_has_async_subdev(struct v4l2_async_notifier *notifier, |
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struct v4l2_async_subdev *asd) |
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{ |
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struct v4l2_async_subdev *asd_y; |
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struct v4l2_subdev *sd; |
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list_for_each_entry(asd_y, ¬ifier->waiting, list) |
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if (asd_equal(asd, asd_y)) |
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return true; |
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list_for_each_entry(sd, ¬ifier->done, async_list) { |
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if (WARN_ON(!sd->asd)) |
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continue; |
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if (asd_equal(asd, sd->asd)) |
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return true; |
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} |
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return false; |
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} |
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/* |
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* Find out whether an async sub-device was set up already or |
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* whether it exists in a given notifier before @this_index. |
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* If @this_index < 0, search the notifier's entire @asd_list. |
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*/ |
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static bool |
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v4l2_async_notifier_has_async_subdev(struct v4l2_async_notifier *notifier, |
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struct v4l2_async_subdev *asd, |
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int this_index) |
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{ |
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struct v4l2_async_subdev *asd_y; |
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int j = 0; |
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lockdep_assert_held(&list_lock); |
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/* Check that an asd is not being added more than once. */ |
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list_for_each_entry(asd_y, ¬ifier->asd_list, asd_list) { |
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if (this_index >= 0 && j++ >= this_index) |
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break; |
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if (asd_equal(asd, asd_y)) |
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return true; |
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} |
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/* Check that an asd does not exist in other notifiers. */ |
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list_for_each_entry(notifier, ¬ifier_list, list) |
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if (__v4l2_async_notifier_has_async_subdev(notifier, asd)) |
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return true; |
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return false; |
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} |
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static int v4l2_async_notifier_asd_valid(struct v4l2_async_notifier *notifier, |
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struct v4l2_async_subdev *asd, |
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int this_index) |
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{ |
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struct device *dev = |
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notifier->v4l2_dev ? notifier->v4l2_dev->dev : NULL; |
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|
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if (!asd) |
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return -EINVAL; |
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switch (asd->match_type) { |
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case V4L2_ASYNC_MATCH_I2C: |
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case V4L2_ASYNC_MATCH_FWNODE: |
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if (v4l2_async_notifier_has_async_subdev(notifier, asd, |
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this_index)) { |
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dev_dbg(dev, "subdev descriptor already listed in this or other notifiers\n"); |
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return -EEXIST; |
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} |
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break; |
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default: |
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dev_err(dev, "Invalid match type %u on %p\n", |
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asd->match_type, asd); |
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return -EINVAL; |
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} |
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return 0; |
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} |
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void v4l2_async_notifier_init(struct v4l2_async_notifier *notifier) |
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{ |
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INIT_LIST_HEAD(¬ifier->asd_list); |
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} |
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EXPORT_SYMBOL(v4l2_async_notifier_init); |
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|
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static int __v4l2_async_notifier_register(struct v4l2_async_notifier *notifier) |
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{ |
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struct v4l2_async_subdev *asd; |
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int ret, i = 0; |
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|
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INIT_LIST_HEAD(¬ifier->waiting); |
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INIT_LIST_HEAD(¬ifier->done); |
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|
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mutex_lock(&list_lock); |
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|
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list_for_each_entry(asd, ¬ifier->asd_list, asd_list) { |
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ret = v4l2_async_notifier_asd_valid(notifier, asd, i++); |
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if (ret) |
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goto err_unlock; |
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list_add_tail(&asd->list, ¬ifier->waiting); |
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} |
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ret = v4l2_async_notifier_try_all_subdevs(notifier); |
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if (ret < 0) |
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goto err_unbind; |
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|
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ret = v4l2_async_notifier_try_complete(notifier); |
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if (ret < 0) |
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goto err_unbind; |
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|
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/* Keep also completed notifiers on the list */ |
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list_add(¬ifier->list, ¬ifier_list); |
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|
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mutex_unlock(&list_lock); |
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return 0; |
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err_unbind: |
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/* |
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* On failure, unbind all sub-devices registered through this notifier. |
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*/ |
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v4l2_async_notifier_unbind_all_subdevs(notifier); |
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err_unlock: |
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mutex_unlock(&list_lock); |
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return ret; |
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} |
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int v4l2_async_notifier_register(struct v4l2_device *v4l2_dev, |
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struct v4l2_async_notifier *notifier) |
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{ |
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int ret; |
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if (WARN_ON(!v4l2_dev || notifier->sd)) |
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return -EINVAL; |
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notifier->v4l2_dev = v4l2_dev; |
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|
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ret = __v4l2_async_notifier_register(notifier); |
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if (ret) |
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notifier->v4l2_dev = NULL; |
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return ret; |
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} |
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EXPORT_SYMBOL(v4l2_async_notifier_register); |
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|
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int v4l2_async_subdev_notifier_register(struct v4l2_subdev *sd, |
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struct v4l2_async_notifier *notifier) |
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{ |
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int ret; |
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|
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if (WARN_ON(!sd || notifier->v4l2_dev)) |
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return -EINVAL; |
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notifier->sd = sd; |
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|
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ret = __v4l2_async_notifier_register(notifier); |
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if (ret) |
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notifier->sd = NULL; |
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|
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return ret; |
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} |
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EXPORT_SYMBOL(v4l2_async_subdev_notifier_register); |
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|
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static void |
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__v4l2_async_notifier_unregister(struct v4l2_async_notifier *notifier) |
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{ |
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if (!notifier || (!notifier->v4l2_dev && !notifier->sd)) |
|
return; |
|
|
|
v4l2_async_notifier_unbind_all_subdevs(notifier); |
|
|
|
notifier->sd = NULL; |
|
notifier->v4l2_dev = NULL; |
|
|
|
list_del(¬ifier->list); |
|
} |
|
|
|
void v4l2_async_notifier_unregister(struct v4l2_async_notifier *notifier) |
|
{ |
|
mutex_lock(&list_lock); |
|
|
|
__v4l2_async_notifier_unregister(notifier); |
|
|
|
mutex_unlock(&list_lock); |
|
} |
|
EXPORT_SYMBOL(v4l2_async_notifier_unregister); |
|
|
|
static void __v4l2_async_notifier_cleanup(struct v4l2_async_notifier *notifier) |
|
{ |
|
struct v4l2_async_subdev *asd, *tmp; |
|
|
|
if (!notifier || !notifier->asd_list.next) |
|
return; |
|
|
|
list_for_each_entry_safe(asd, tmp, ¬ifier->asd_list, asd_list) { |
|
switch (asd->match_type) { |
|
case V4L2_ASYNC_MATCH_FWNODE: |
|
fwnode_handle_put(asd->match.fwnode); |
|
break; |
|
default: |
|
break; |
|
} |
|
|
|
list_del(&asd->asd_list); |
|
kfree(asd); |
|
} |
|
} |
|
|
|
void v4l2_async_notifier_cleanup(struct v4l2_async_notifier *notifier) |
|
{ |
|
mutex_lock(&list_lock); |
|
|
|
__v4l2_async_notifier_cleanup(notifier); |
|
|
|
mutex_unlock(&list_lock); |
|
} |
|
EXPORT_SYMBOL_GPL(v4l2_async_notifier_cleanup); |
|
|
|
int __v4l2_async_notifier_add_subdev(struct v4l2_async_notifier *notifier, |
|
struct v4l2_async_subdev *asd) |
|
{ |
|
int ret; |
|
|
|
mutex_lock(&list_lock); |
|
|
|
ret = v4l2_async_notifier_asd_valid(notifier, asd, -1); |
|
if (ret) |
|
goto unlock; |
|
|
|
list_add_tail(&asd->asd_list, ¬ifier->asd_list); |
|
|
|
unlock: |
|
mutex_unlock(&list_lock); |
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(__v4l2_async_notifier_add_subdev); |
|
|
|
struct v4l2_async_subdev * |
|
__v4l2_async_notifier_add_fwnode_subdev(struct v4l2_async_notifier *notifier, |
|
struct fwnode_handle *fwnode, |
|
unsigned int asd_struct_size) |
|
{ |
|
struct v4l2_async_subdev *asd; |
|
int ret; |
|
|
|
asd = kzalloc(asd_struct_size, GFP_KERNEL); |
|
if (!asd) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
asd->match_type = V4L2_ASYNC_MATCH_FWNODE; |
|
asd->match.fwnode = fwnode_handle_get(fwnode); |
|
|
|
ret = __v4l2_async_notifier_add_subdev(notifier, asd); |
|
if (ret) { |
|
fwnode_handle_put(fwnode); |
|
kfree(asd); |
|
return ERR_PTR(ret); |
|
} |
|
|
|
return asd; |
|
} |
|
EXPORT_SYMBOL_GPL(__v4l2_async_notifier_add_fwnode_subdev); |
|
|
|
struct v4l2_async_subdev * |
|
__v4l2_async_notifier_add_fwnode_remote_subdev(struct v4l2_async_notifier *notif, |
|
struct fwnode_handle *endpoint, |
|
unsigned int asd_struct_size) |
|
{ |
|
struct v4l2_async_subdev *asd; |
|
struct fwnode_handle *remote; |
|
|
|
remote = fwnode_graph_get_remote_port_parent(endpoint); |
|
if (!remote) |
|
return ERR_PTR(-ENOTCONN); |
|
|
|
asd = __v4l2_async_notifier_add_fwnode_subdev(notif, remote, |
|
asd_struct_size); |
|
/* |
|
* Calling __v4l2_async_notifier_add_fwnode_subdev grabs a refcount, |
|
* so drop the one we got in fwnode_graph_get_remote_port_parent. |
|
*/ |
|
fwnode_handle_put(remote); |
|
return asd; |
|
} |
|
EXPORT_SYMBOL_GPL(__v4l2_async_notifier_add_fwnode_remote_subdev); |
|
|
|
struct v4l2_async_subdev * |
|
__v4l2_async_notifier_add_i2c_subdev(struct v4l2_async_notifier *notifier, |
|
int adapter_id, unsigned short address, |
|
unsigned int asd_struct_size) |
|
{ |
|
struct v4l2_async_subdev *asd; |
|
int ret; |
|
|
|
asd = kzalloc(asd_struct_size, GFP_KERNEL); |
|
if (!asd) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
asd->match_type = V4L2_ASYNC_MATCH_I2C; |
|
asd->match.i2c.adapter_id = adapter_id; |
|
asd->match.i2c.address = address; |
|
|
|
ret = __v4l2_async_notifier_add_subdev(notifier, asd); |
|
if (ret) { |
|
kfree(asd); |
|
return ERR_PTR(ret); |
|
} |
|
|
|
return asd; |
|
} |
|
EXPORT_SYMBOL_GPL(__v4l2_async_notifier_add_i2c_subdev); |
|
|
|
int v4l2_async_register_subdev(struct v4l2_subdev *sd) |
|
{ |
|
struct v4l2_async_notifier *subdev_notifier; |
|
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_device *v4l2_dev = |
|
v4l2_async_notifier_find_v4l2_dev(notifier); |
|
struct v4l2_async_subdev *asd; |
|
|
|
if (!v4l2_dev) |
|
continue; |
|
|
|
asd = v4l2_async_find_match(notifier, sd); |
|
if (!asd) |
|
continue; |
|
|
|
ret = v4l2_async_match_notify(notifier, v4l2_dev, sd, asd); |
|
if (ret) |
|
goto err_unbind; |
|
|
|
ret = v4l2_async_notifier_try_complete(notifier); |
|
if (ret) |
|
goto err_unbind; |
|
|
|
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_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_notifier_unbind_all_subdevs(subdev_notifier); |
|
|
|
if (sd->asd) |
|
v4l2_async_notifier_call_unbind(notifier, sd, sd->asd); |
|
v4l2_async_cleanup(sd); |
|
|
|
mutex_unlock(&list_lock); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL(v4l2_async_register_subdev); |
|
|
|
void v4l2_async_unregister_subdev(struct v4l2_subdev *sd) |
|
{ |
|
if (!sd->async_list.next) |
|
return; |
|
|
|
mutex_lock(&list_lock); |
|
|
|
__v4l2_async_notifier_unregister(sd->subdev_notifier); |
|
__v4l2_async_notifier_cleanup(sd->subdev_notifier); |
|
kfree(sd->subdev_notifier); |
|
sd->subdev_notifier = NULL; |
|
|
|
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); |
|
|
|
static void print_waiting_subdev(struct seq_file *s, |
|
struct v4l2_async_subdev *asd) |
|
{ |
|
switch (asd->match_type) { |
|
case V4L2_ASYNC_MATCH_I2C: |
|
seq_printf(s, " [i2c] dev=%d-%04x\n", asd->match.i2c.adapter_id, |
|
asd->match.i2c.address); |
|
break; |
|
case V4L2_ASYNC_MATCH_FWNODE: { |
|
struct fwnode_handle *devnode, *fwnode = asd->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_notifier_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_subdev *asd; |
|
|
|
mutex_lock(&list_lock); |
|
|
|
list_for_each_entry(notif, ¬ifier_list, list) { |
|
seq_printf(s, "%s:\n", v4l2_async_notifier_name(notif)); |
|
list_for_each_entry(asd, ¬if->waiting, list) |
|
print_waiting_subdev(s, asd); |
|
} |
|
|
|
mutex_unlock(&list_lock); |
|
|
|
return 0; |
|
} |
|
DEFINE_SHOW_ATTRIBUTE(pending_subdevs); |
|
|
|
void v4l2_async_debug_init(struct dentry *debugfs_dir) |
|
{ |
|
debugfs_create_file("pending_async_subdevices", 0444, debugfs_dir, NULL, |
|
&pending_subdevs_fops); |
|
}
|
|
|