2013-01-08 18:06:31 +08:00
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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 <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 device *dev, struct v4l2_async_subdev *asd)
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{
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2013-06-24 16:13:51 +08:00
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#if IS_ENABLED(CONFIG_I2C)
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2013-01-08 18:06:31 +08:00
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struct i2c_client *client = i2c_verify_client(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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2013-06-24 16:13:51 +08:00
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#else
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return false;
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#endif
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2013-01-08 18:06:31 +08:00
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}
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static bool match_platform(struct device *dev, struct v4l2_async_subdev *asd)
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{
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2013-07-19 23:08:08 +08:00
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return !strcmp(asd->match.platform.name, dev_name(dev));
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2013-01-08 18:06:31 +08:00
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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_async_subdev_list *asdl)
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{
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struct v4l2_subdev *sd = v4l2_async_to_subdev(asdl);
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struct v4l2_async_subdev *asd;
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bool (*match)(struct device *,
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struct v4l2_async_subdev *);
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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->bus_type) {
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case V4L2_ASYNC_BUS_CUSTOM:
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match = asd->match.custom.match;
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if (!match)
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/* Match always */
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return asd;
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break;
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case V4L2_ASYNC_BUS_PLATFORM:
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match = match_platform;
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break;
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case V4L2_ASYNC_BUS_I2C:
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match = match_i2c;
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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->dev, 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_async_subdev_list *asdl,
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struct v4l2_async_subdev *asd)
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{
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struct v4l2_subdev *sd = v4l2_async_to_subdev(asdl);
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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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asdl->asd = asd;
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asdl->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(&asdl->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_async_subdev_list *asdl)
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{
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struct v4l2_subdev *sd = v4l2_async_to_subdev(asdl);
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v4l2_device_unregister_subdev(sd);
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/* Subdevice driver will reprobe and put asdl back onto the list */
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list_del_init(&asdl->list);
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asdl->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_async_subdev_list *asdl, *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->subdev[i];
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switch (asd->bus_type) {
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case V4L2_ASYNC_BUS_CUSTOM:
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case V4L2_ASYNC_BUS_PLATFORM:
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case V4L2_ASYNC_BUS_I2C:
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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 bus-type %u on %p\n",
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asd->bus_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(asdl, tmp, &subdev_list, list) {
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int ret;
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asd = v4l2_async_belongs(notifier, asdl);
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if (!asd)
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continue;
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ret = v4l2_async_test_notify(notifier, asdl, 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_async_subdev_list *asdl, *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[n_subdev];
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int i = 0;
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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(asdl, tmp, ¬ifier->done, list) {
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struct v4l2_subdev *sd = v4l2_async_to_subdev(asdl);
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dev[i] = get_device(sd->dev);
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v4l2_async_cleanup(asdl);
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/* If we handled USB devices, we'd have to lock the parent too */
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device_release_driver(dev[i++]);
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if (notifier->unbind)
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notifier->unbind(notifier, sd, sd->asdl.asd);
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}
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mutex_unlock(&list_lock);
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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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/*
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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_subdev_list *asdl = &sd->asdl;
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struct v4l2_async_notifier *notifier;
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mutex_lock(&list_lock);
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INIT_LIST_HEAD(&asdl->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, asdl);
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if (asd) {
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int ret = v4l2_async_test_notify(notifier, asdl, 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(&asdl->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_subdev_list *asdl = &sd->asdl;
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struct v4l2_async_notifier *notifier = asdl->notifier;
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if (!asdl->asd) {
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if (!list_empty(&asdl->list))
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v4l2_async_cleanup(asdl);
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return;
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}
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mutex_lock(&list_lock);
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list_add(&asdl->asd->list, ¬ifier->waiting);
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v4l2_async_cleanup(asdl);
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if (notifier->unbind)
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notifier->unbind(notifier, sd, sd->asdl.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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