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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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862176512b
V4L2 async sub-devices are currently matched (OF case) based on the struct device_node pointer in struct device. LED devices may have more than one LED, and in that case the OF node to match is not directly the device's node, but a LED's node. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi> Signed-off-by: Bryan Wu <cooloney@gmail.com>
328 lines
7.4 KiB
C
328 lines
7.4 KiB
C
/*
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* V4L2 asynchronous subdevice registration API
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*
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* Copyright (C) 2012-2013, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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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/module.h>
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#include <linux/mutex.h>
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#include <linux/platform_device.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-subdev.h>
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static bool match_i2c(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_devname(struct v4l2_subdev *sd,
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struct v4l2_async_subdev *asd)
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{
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return !strcmp(asd->match.device_name.name, dev_name(sd->dev));
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}
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static bool match_of(struct v4l2_subdev *sd, struct v4l2_async_subdev *asd)
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{
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return sd->of_node == asd->match.of.node;
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}
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static bool match_custom(struct v4l2_subdev *sd, struct v4l2_async_subdev *asd)
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{
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if (!asd->match.custom.match)
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/* Match always */
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return true;
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return asd->match.custom.match(sd->dev, asd);
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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 *v4l2_async_belongs(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_subdev *, struct v4l2_async_subdev *);
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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_CUSTOM:
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match = match_custom;
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break;
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case V4L2_ASYNC_MATCH_DEVNAME:
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match = match_devname;
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break;
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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_OF:
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match = match_of;
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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(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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static int v4l2_async_test_notify(struct v4l2_async_notifier *notifier,
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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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int ret;
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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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if (notifier->bound) {
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ret = notifier->bound(notifier, sd, asd);
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if (ret < 0)
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return ret;
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}
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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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ret = v4l2_device_register_subdev(notifier->v4l2_dev, sd);
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if (ret < 0) {
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if (notifier->unbind)
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notifier->unbind(notifier, sd, asd);
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return ret;
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}
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if (list_empty(¬ifier->waiting) && notifier->complete)
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return notifier->complete(notifier);
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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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/* Subdevice driver will reprobe and put the subdev back onto the list */
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list_del_init(&sd->async_list);
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sd->asd = NULL;
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sd->dev = NULL;
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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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struct v4l2_subdev *sd, *tmp;
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struct v4l2_async_subdev *asd;
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int i;
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if (!notifier->num_subdevs || notifier->num_subdevs > V4L2_MAX_SUBDEVS)
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return -EINVAL;
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notifier->v4l2_dev = v4l2_dev;
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INIT_LIST_HEAD(¬ifier->waiting);
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INIT_LIST_HEAD(¬ifier->done);
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for (i = 0; i < notifier->num_subdevs; i++) {
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asd = notifier->subdevs[i];
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switch (asd->match_type) {
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case V4L2_ASYNC_MATCH_CUSTOM:
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case V4L2_ASYNC_MATCH_DEVNAME:
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case V4L2_ASYNC_MATCH_I2C:
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case V4L2_ASYNC_MATCH_OF:
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break;
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default:
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dev_err(notifier->v4l2_dev ? notifier->v4l2_dev->dev : NULL,
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"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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list_add_tail(&asd->list, ¬ifier->waiting);
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}
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mutex_lock(&list_lock);
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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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list_for_each_entry_safe(sd, tmp, &subdev_list, async_list) {
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int ret;
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asd = v4l2_async_belongs(notifier, sd);
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if (!asd)
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continue;
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ret = v4l2_async_test_notify(notifier, sd, asd);
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if (ret < 0) {
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mutex_unlock(&list_lock);
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return ret;
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}
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}
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mutex_unlock(&list_lock);
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return 0;
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}
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EXPORT_SYMBOL(v4l2_async_notifier_register);
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void v4l2_async_notifier_unregister(struct v4l2_async_notifier *notifier)
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{
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struct v4l2_subdev *sd, *tmp;
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unsigned int notif_n_subdev = notifier->num_subdevs;
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unsigned int n_subdev = min(notif_n_subdev, V4L2_MAX_SUBDEVS);
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struct device **dev;
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int i = 0;
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if (!notifier->v4l2_dev)
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return;
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dev = kmalloc(n_subdev * sizeof(*dev), GFP_KERNEL);
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if (!dev) {
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dev_err(notifier->v4l2_dev->dev,
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"Failed to allocate device cache!\n");
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}
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mutex_lock(&list_lock);
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list_del(¬ifier->list);
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list_for_each_entry_safe(sd, tmp, ¬ifier->done, async_list) {
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struct device *d;
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d = get_device(sd->dev);
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v4l2_async_cleanup(sd);
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/* If we handled USB devices, we'd have to lock the parent too */
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device_release_driver(d);
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if (notifier->unbind)
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notifier->unbind(notifier, sd, sd->asd);
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/*
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* Store device at the device cache, in order to call
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* put_device() on the final step
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*/
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if (dev)
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dev[i++] = d;
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else
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put_device(d);
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}
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mutex_unlock(&list_lock);
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/*
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* Call device_attach() to reprobe devices
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*
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* NOTE: If dev allocation fails, i is 0, and the whole loop won't be
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* executed.
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*/
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while (i--) {
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struct device *d = dev[i];
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if (d && device_attach(d) < 0) {
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const char *name = "(none)";
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int lock = device_trylock(d);
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if (lock && d->driver)
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name = d->driver->name;
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dev_err(d, "Failed to re-probe to %s\n", name);
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if (lock)
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device_unlock(d);
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}
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put_device(d);
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}
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kfree(dev);
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notifier->v4l2_dev = NULL;
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/*
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* Don't care about the waiting list, it is initialised and populated
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* upon notifier registration.
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*/
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}
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EXPORT_SYMBOL(v4l2_async_notifier_unregister);
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int v4l2_async_register_subdev(struct v4l2_subdev *sd)
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{
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struct v4l2_async_notifier *notifier;
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/*
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* No reference taken. The reference is held by the device
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* (struct v4l2_subdev.dev), and async sub-device does not
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* exist independently of the device at any point of time.
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*/
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if (!sd->of_node && sd->dev)
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sd->of_node = sd->dev->of_node;
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mutex_lock(&list_lock);
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INIT_LIST_HEAD(&sd->async_list);
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list_for_each_entry(notifier, ¬ifier_list, list) {
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struct v4l2_async_subdev *asd = v4l2_async_belongs(notifier, sd);
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if (asd) {
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int ret = v4l2_async_test_notify(notifier, sd, asd);
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mutex_unlock(&list_lock);
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return ret;
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}
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}
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/* None matched, wait for hot-plugging */
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list_add(&sd->async_list, &subdev_list);
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mutex_unlock(&list_lock);
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return 0;
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}
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EXPORT_SYMBOL(v4l2_async_register_subdev);
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void v4l2_async_unregister_subdev(struct v4l2_subdev *sd)
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{
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struct v4l2_async_notifier *notifier = sd->notifier;
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if (!sd->asd) {
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if (!list_empty(&sd->async_list))
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v4l2_async_cleanup(sd);
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return;
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}
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mutex_lock(&list_lock);
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list_add(&sd->asd->list, ¬ifier->waiting);
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v4l2_async_cleanup(sd);
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if (notifier->unbind)
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notifier->unbind(notifier, sd, sd->asd);
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mutex_unlock(&list_lock);
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}
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EXPORT_SYMBOL(v4l2_async_unregister_subdev);
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