[mirror_ubuntu-artful-kernel.git] / drivers / media / cec / cec-core.c

/*
 * cec-core.c - HDMI Consumer Electronics Control framework - Core
 *
 * Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
 *
 * This program is free software; you may redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/errno.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/kmod.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/types.h>

#include "cec-priv.h"

#define CEC_NUM_DEVICES	256
#define CEC_NAME	"cec"

int cec_debug;
module_param_named(debug, cec_debug, int, 0644);
MODULE_PARM_DESC(debug, "debug level (0-2)");

static dev_t cec_dev_t;

/* Active devices */
static DEFINE_MUTEX(cec_devnode_lock);
static DECLARE_BITMAP(cec_devnode_nums, CEC_NUM_DEVICES);

static struct dentry *top_cec_dir;

/* dev to cec_devnode */
#define to_cec_devnode(cd) container_of(cd, struct cec_devnode, dev)

int cec_get_device(struct cec_devnode *devnode)
{
	/*
	 * Check if the cec device is available. This needs to be done with
	 * the devnode->lock held to prevent an open/unregister race:
	 * without the lock, the device could be unregistered and freed between
	 * the devnode->registered check and get_device() calls, leading to
	 * a crash.
	 */
	mutex_lock(&devnode->lock);
	/*
	 * return ENXIO if the cec device has been removed
	 * already or if it is not registered anymore.
	 */
	if (!devnode->registered) {
		mutex_unlock(&devnode->lock);
		return -ENXIO;
	}
	/* and increase the device refcount */
	get_device(&devnode->dev);
	mutex_unlock(&devnode->lock);
	return 0;
}

void cec_put_device(struct cec_devnode *devnode)
{
	put_device(&devnode->dev);
}

/* Called when the last user of the cec device exits. */
static void cec_devnode_release(struct device *cd)
{
	struct cec_devnode *devnode = to_cec_devnode(cd);

	mutex_lock(&cec_devnode_lock);
	/* Mark device node number as free */
	clear_bit(devnode->minor, cec_devnode_nums);
	mutex_unlock(&cec_devnode_lock);

	cec_delete_adapter(to_cec_adapter(devnode));
}

static struct bus_type cec_bus_type = {
	.name = CEC_NAME,
};

/*
 * Register a cec device node
 *
 * The registration code assigns minor numbers and registers the new device node
 * with the kernel. An error is returned if no free minor number can be found,
 * or if the registration of the device node fails.
 *
 * Zero is returned on success.
 *
 * Note that if the cec_devnode_register call fails, the release() callback of
 * the cec_devnode structure is *not* called, so the caller is responsible for
 * freeing any data.
 */
static int __must_check cec_devnode_register(struct cec_devnode *devnode,
					     struct module *owner)
{
	int minor;
	int ret;

	/* Initialization */
	INIT_LIST_HEAD(&devnode->fhs);
	mutex_init(&devnode->lock);

	/* Part 1: Find a free minor number */
	mutex_lock(&cec_devnode_lock);
	minor = find_next_zero_bit(cec_devnode_nums, CEC_NUM_DEVICES, 0);
	if (minor == CEC_NUM_DEVICES) {
		mutex_unlock(&cec_devnode_lock);
		pr_err("could not get a free minor\n");
		return -ENFILE;
	}

	set_bit(minor, cec_devnode_nums);
	mutex_unlock(&cec_devnode_lock);

	devnode->minor = minor;
	devnode->dev.bus = &cec_bus_type;
	devnode->dev.devt = MKDEV(MAJOR(cec_dev_t), minor);
	devnode->dev.release = cec_devnode_release;
	dev_set_name(&devnode->dev, "cec%d", devnode->minor);
	device_initialize(&devnode->dev);

	/* Part 2: Initialize and register the character device */
	cdev_init(&devnode->cdev, &cec_devnode_fops);
	devnode->cdev.owner = owner;

	ret = cdev_device_add(&devnode->cdev, &devnode->dev);
	if (ret) {
		pr_err("%s: cdev_device_add failed\n", __func__);
		goto clr_bit;
	}

	devnode->registered = true;
	return 0;

clr_bit:
	mutex_lock(&cec_devnode_lock);
	clear_bit(devnode->minor, cec_devnode_nums);
	mutex_unlock(&cec_devnode_lock);
	return ret;
}

/*
 * Unregister a cec device node
 *
 * This unregisters the passed device. Future open calls will be met with
 * errors.
 *
 * This function can safely be called if the device node has never been
 * registered or has already been unregistered.
 */
static void cec_devnode_unregister(struct cec_devnode *devnode)
{
	struct cec_fh *fh;

	mutex_lock(&devnode->lock);

	/* Check if devnode was never registered or already unregistered */
	if (!devnode->registered || devnode->unregistered) {
		mutex_unlock(&devnode->lock);
		return;
	}

	list_for_each_entry(fh, &devnode->fhs, list)
		wake_up_interruptible(&fh->wait);

	devnode->registered = false;
	devnode->unregistered = true;
	mutex_unlock(&devnode->lock);

	cdev_device_del(&devnode->cdev, &devnode->dev);
	put_device(&devnode->dev);
}

#ifdef CONFIG_CEC_NOTIFIER
static void cec_cec_notify(struct cec_adapter *adap, u16 pa)
{
	cec_s_phys_addr(adap, pa, false);
}

void cec_register_cec_notifier(struct cec_adapter *adap,
			       struct cec_notifier *notifier)
{
	if (WARN_ON(!adap->devnode.registered))
		return;

	adap->notifier = notifier;
	cec_notifier_register(adap->notifier, adap, cec_cec_notify);
}
EXPORT_SYMBOL_GPL(cec_register_cec_notifier);
#endif

struct cec_adapter *cec_allocate_adapter(const struct cec_adap_ops *ops,
					 void *priv, const char *name, u32 caps,
					 u8 available_las)
{
	struct cec_adapter *adap;
	int res;

#ifndef CONFIG_MEDIA_CEC_RC
	caps &= ~CEC_CAP_RC;
#endif

	if (WARN_ON(!caps))
		return ERR_PTR(-EINVAL);
	if (WARN_ON(!ops))
		return ERR_PTR(-EINVAL);
	if (WARN_ON(!available_las || available_las > CEC_MAX_LOG_ADDRS))
		return ERR_PTR(-EINVAL);
	adap = kzalloc(sizeof(*adap), GFP_KERNEL);
	if (!adap)
		return ERR_PTR(-ENOMEM);
	strlcpy(adap->name, name, sizeof(adap->name));
	adap->phys_addr = CEC_PHYS_ADDR_INVALID;
	adap->log_addrs.cec_version = CEC_OP_CEC_VERSION_2_0;
	adap->log_addrs.vendor_id = CEC_VENDOR_ID_NONE;
	adap->capabilities = caps;
	adap->available_log_addrs = available_las;
	adap->sequence = 0;
	adap->ops = ops;
	adap->priv = priv;
	memset(adap->phys_addrs, 0xff, sizeof(adap->phys_addrs));
	mutex_init(&adap->lock);
	INIT_LIST_HEAD(&adap->transmit_queue);
	INIT_LIST_HEAD(&adap->wait_queue);
	init_waitqueue_head(&adap->kthread_waitq);

	adap->kthread = kthread_run(cec_thread_func, adap, "cec-%s", name);
	if (IS_ERR(adap->kthread)) {
		pr_err("cec-%s: kernel_thread() failed\n", name);
		res = PTR_ERR(adap->kthread);
		kfree(adap);
		return ERR_PTR(res);
	}

#ifdef CONFIG_MEDIA_CEC_RC
	if (!(caps & CEC_CAP_RC))
		return adap;

	/* Prepare the RC input device */
	adap->rc = rc_allocate_device(RC_DRIVER_SCANCODE);
	if (!adap->rc) {
		pr_err("cec-%s: failed to allocate memory for rc_dev\n",
		       name);
		kthread_stop(adap->kthread);
		kfree(adap);
		return ERR_PTR(-ENOMEM);
	}

	snprintf(adap->input_name, sizeof(adap->input_name),
		 "RC for %s", name);
	snprintf(adap->input_phys, sizeof(adap->input_phys),
		 "%s/input0", name);

	adap->rc->input_name = adap->input_name;
	adap->rc->input_phys = adap->input_phys;
	adap->rc->input_id.bustype = BUS_CEC;
	adap->rc->input_id.vendor = 0;
	adap->rc->input_id.product = 0;
	adap->rc->input_id.version = 1;
	adap->rc->driver_name = CEC_NAME;
	adap->rc->allowed_protocols = RC_BIT_CEC;
	adap->rc->priv = adap;
	adap->rc->map_name = RC_MAP_CEC;
	adap->rc->timeout = MS_TO_NS(100);
#endif
	return adap;
}
EXPORT_SYMBOL_GPL(cec_allocate_adapter);

int cec_register_adapter(struct cec_adapter *adap,
			 struct device *parent)
{
	int res;

	if (IS_ERR_OR_NULL(adap))
		return 0;

	if (WARN_ON(!parent))
		return -EINVAL;

	adap->owner = parent->driver->owner;
	adap->devnode.dev.parent = parent;

#ifdef CONFIG_MEDIA_CEC_RC
	if (adap->capabilities & CEC_CAP_RC) {
		adap->rc->dev.parent = parent;
		res = rc_register_device(adap->rc);

		if (res) {
			pr_err("cec-%s: failed to prepare input device\n",
			       adap->name);
			rc_free_device(adap->rc);
			adap->rc = NULL;
			return res;
		}
	}
#endif

	res = cec_devnode_register(&adap->devnode, adap->owner);
	if (res) {
#ifdef CONFIG_MEDIA_CEC_RC
		/* Note: rc_unregister also calls rc_free */
		rc_unregister_device(adap->rc);
		adap->rc = NULL;
#endif
		return res;
	}

	dev_set_drvdata(&adap->devnode.dev, adap);
#ifdef CONFIG_DEBUG_FS
	if (!top_cec_dir)
		return 0;

	adap->cec_dir = debugfs_create_dir(dev_name(&adap->devnode.dev), top_cec_dir);
	if (IS_ERR_OR_NULL(adap->cec_dir)) {
		pr_warn("cec-%s: Failed to create debugfs dir\n", adap->name);
		return 0;
	}
	adap->status_file = debugfs_create_devm_seqfile(&adap->devnode.dev,
		"status", adap->cec_dir, cec_adap_status);
	if (IS_ERR_OR_NULL(adap->status_file)) {
		pr_warn("cec-%s: Failed to create status file\n", adap->name);
		debugfs_remove_recursive(adap->cec_dir);
		adap->cec_dir = NULL;
	}
#endif
	return 0;
}
EXPORT_SYMBOL_GPL(cec_register_adapter);

void cec_unregister_adapter(struct cec_adapter *adap)
{
	if (IS_ERR_OR_NULL(adap))
		return;

#ifdef CONFIG_MEDIA_CEC_RC
	/* Note: rc_unregister also calls rc_free */
	rc_unregister_device(adap->rc);
	adap->rc = NULL;
#endif
	debugfs_remove_recursive(adap->cec_dir);
#ifdef CONFIG_CEC_NOTIFIER
	if (adap->notifier)
		cec_notifier_unregister(adap->notifier);
#endif
	cec_devnode_unregister(&adap->devnode);
}
EXPORT_SYMBOL_GPL(cec_unregister_adapter);

void cec_delete_adapter(struct cec_adapter *adap)
{
	if (IS_ERR_OR_NULL(adap))
		return;
	mutex_lock(&adap->lock);
	__cec_s_phys_addr(adap, CEC_PHYS_ADDR_INVALID, false);
	mutex_unlock(&adap->lock);
	kthread_stop(adap->kthread);
	if (adap->kthread_config)
		kthread_stop(adap->kthread_config);
#ifdef CONFIG_MEDIA_CEC_RC
	rc_free_device(adap->rc);
#endif
	kfree(adap);
}
EXPORT_SYMBOL_GPL(cec_delete_adapter);

/*
 *	Initialise cec for linux
 */
static int __init cec_devnode_init(void)
{
	int ret;

	pr_info("Linux cec interface: v0.10\n");
	ret = alloc_chrdev_region(&cec_dev_t, 0, CEC_NUM_DEVICES,
				  CEC_NAME);
	if (ret < 0) {
		pr_warn("cec: unable to allocate major\n");
		return ret;
	}

#ifdef CONFIG_DEBUG_FS
	top_cec_dir = debugfs_create_dir("cec", NULL);
	if (IS_ERR_OR_NULL(top_cec_dir)) {
		pr_warn("cec: Failed to create debugfs cec dir\n");
		top_cec_dir = NULL;
	}
#endif

	ret = bus_register(&cec_bus_type);
	if (ret < 0) {
		unregister_chrdev_region(cec_dev_t, CEC_NUM_DEVICES);
		pr_warn("cec: bus_register failed\n");
		return -EIO;
	}

	return 0;
}

static void __exit cec_devnode_exit(void)
{
	debugfs_remove_recursive(top_cec_dir);
	bus_unregister(&cec_bus_type);
	unregister_chrdev_region(cec_dev_t, CEC_NUM_DEVICES);
}

subsys_initcall(cec_devnode_init);
module_exit(cec_devnode_exit)

MODULE_AUTHOR("Hans Verkuil <hans.verkuil@cisco.com>");
MODULE_DESCRIPTION("Device node registration for cec drivers");
MODULE_LICENSE("GPL");
Commit	Line	Data
a56960e8 HV	1	/*
	2	* cec-core.c - HDMI Consumer Electronics Control framework - Core
	3	*
	4	* Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
	5	*
	6	* This program is free software; you may redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; version 2 of the License.
	9	*
	10	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	11	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	12	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	13	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	14	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	15	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	16	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	17	* SOFTWARE.
	18	*/
	19
	20	#include <linux/errno.h>
	21	#include <linux/init.h>
	22	#include <linux/module.h>
	23	#include <linux/kernel.h>
	24	#include <linux/kmod.h>
	25	#include <linux/slab.h>
	26	#include <linux/mm.h>
	27	#include <linux/string.h>
	28	#include <linux/types.h>
	29
	30	#include "cec-priv.h"
	31
	32	#define CEC_NUM_DEVICES 256
	33	#define CEC_NAME "cec"
	34
	35	int cec_debug;
	36	module_param_named(debug, cec_debug, int, 0644);
	37	MODULE_PARM_DESC(debug, "debug level (0-2)");
	38
	39	static dev_t cec_dev_t;
	40
	41	/* Active devices */
	42	static DEFINE_MUTEX(cec_devnode_lock);
	43	static DECLARE_BITMAP(cec_devnode_nums, CEC_NUM_DEVICES);
	44
	45	static struct dentry *top_cec_dir;
	46
	47	/* dev to cec_devnode */
	48	#define to_cec_devnode(cd) container_of(cd, struct cec_devnode, dev)
	49
	50	int cec_get_device(struct cec_devnode *devnode)
	51	{
	52	/*
	53	* Check if the cec device is available. This needs to be done with
2ab25d35	54	* the devnode->lock held to prevent an open/unregister race:
a56960e8 HV	55	* without the lock, the device could be unregistered and freed between
	56	* the devnode->registered check and get_device() calls, leading to
	57	* a crash.
	58	*/
2ab25d35	59	mutex_lock(&devnode->lock);
a56960e8 HV	60	/*
	61	* return ENXIO if the cec device has been removed
	62	* already or if it is not registered anymore.
	63	*/
	64	if (!devnode->registered) {
2ab25d35	65	mutex_unlock(&devnode->lock);
a56960e8 HV	66	return -ENXIO;
	67	}
	68	/* and increase the device refcount */
	69	get_device(&devnode->dev);
2ab25d35	70	mutex_unlock(&devnode->lock);
a56960e8 HV	71	return 0;
	72	}
	73
	74	void cec_put_device(struct cec_devnode *devnode)
	75	{
a56960e8	76	put_device(&devnode->dev);
a56960e8 HV	77	}
	78
	79	/* Called when the last user of the cec device exits. */
	80	static void cec_devnode_release(struct device *cd)
	81	{
	82	struct cec_devnode *devnode = to_cec_devnode(cd);
	83
	84	mutex_lock(&cec_devnode_lock);
a56960e8 HV	85	/* Mark device node number as free */
a56960e8 HV	86	clear_bit(devnode->minor, cec_devnode_nums);
a56960e8	87	mutex_unlock(&cec_devnode_lock);
2ab25d35	88
a56960e8 HV	89	cec_delete_adapter(to_cec_adapter(devnode));
	90	}
	91
	92	static struct bus_type cec_bus_type = {
	93	.name = CEC_NAME,
	94	};
	95
	96	/*
	97	* Register a cec device node
	98	*
	99	* The registration code assigns minor numbers and registers the new device node
	100	* with the kernel. An error is returned if no free minor number can be found,
	101	* or if the registration of the device node fails.
	102	*
	103	* Zero is returned on success.
	104	*
	105	* Note that if the cec_devnode_register call fails, the release() callback of
	106	* the cec_devnode structure is not called, so the caller is responsible for
	107	* freeing any data.
	108	*/
	109	static int __must_check cec_devnode_register(struct cec_devnode *devnode,
	110	struct module *owner)
	111	{
	112	int minor;
	113	int ret;
	114
	115	/* Initialization */
	116	INIT_LIST_HEAD(&devnode->fhs);
62148f09	117	mutex_init(&devnode->lock);
a56960e8 HV	118
	119	/* Part 1: Find a free minor number */
	120	mutex_lock(&cec_devnode_lock);
	121	minor = find_next_zero_bit(cec_devnode_nums, CEC_NUM_DEVICES, 0);
	122	if (minor == CEC_NUM_DEVICES) {
	123	mutex_unlock(&cec_devnode_lock);
	124	pr_err("could not get a free minor\n");
	125	return -ENFILE;
	126	}
	127
	128	set_bit(minor, cec_devnode_nums);
	129	mutex_unlock(&cec_devnode_lock);
	130
	131	devnode->minor = minor;
	132	devnode->dev.bus = &cec_bus_type;
	133	devnode->dev.devt = MKDEV(MAJOR(cec_dev_t), minor);
	134	devnode->dev.release = cec_devnode_release;
a56960e8 HV	135	dev_set_name(&devnode->dev, "cec%d", devnode->minor);
	136	device_initialize(&devnode->dev);
	137
	138	/* Part 2: Initialize and register the character device */
	139	cdev_init(&devnode->cdev, &cec_devnode_fops);
a56960e8 HV	140	devnode->cdev.owner = owner;
a56960e8 HV	141
857313e5 LG	142	ret = cdev_device_add(&devnode->cdev, &devnode->dev);
	143	if (ret) {
	144	pr_err("%s: cdev_device_add failed\n", __func__);
a56960e8 HV	145	goto clr_bit;
	146	}
	147
a56960e8 HV	148	devnode->registered = true;
	149	return 0;
	150
a56960e8	151	clr_bit:
2ab25d35	152	mutex_lock(&cec_devnode_lock);
a56960e8	153	clear_bit(devnode->minor, cec_devnode_nums);
2ab25d35	154	mutex_unlock(&cec_devnode_lock);
a56960e8 HV	155	return ret;
	156	}
	157
	158	/*
	159	* Unregister a cec device node
	160	*
	161	* This unregisters the passed device. Future open calls will be met with
	162	* errors.
	163	*
	164	* This function can safely be called if the device node has never been
	165	* registered or has already been unregistered.
	166	*/
	167	static void cec_devnode_unregister(struct cec_devnode *devnode)
	168	{
	169	struct cec_fh *fh;
	170
2ab25d35 HV	171	mutex_lock(&devnode->lock);
2ab25d35 HV	172
a56960e8	173	/* Check if devnode was never registered or already unregistered */
2ab25d35 HV	174	if (!devnode->registered \|\| devnode->unregistered) {
2ab25d35 HV	175	mutex_unlock(&devnode->lock);
a56960e8	176	return;
2ab25d35	177	}
a56960e8	178
a56960e8 HV	179	list_for_each_entry(fh, &devnode->fhs, list)
a56960e8 HV	180	wake_up_interruptible(&fh->wait);
a56960e8 HV	181
	182	devnode->registered = false;
	183	devnode->unregistered = true;
2ab25d35 HV	184	mutex_unlock(&devnode->lock);
2ab25d35 HV	185
857313e5	186	cdev_device_del(&devnode->cdev, &devnode->dev);
a56960e8 HV	187	put_device(&devnode->dev);
	188	}
	189
e94c3281	190	#ifdef CONFIG_CEC_NOTIFIER
e3a93adc HV	191	static void cec_cec_notify(struct cec_adapter *adap, u16 pa)
	192	{
	193	cec_s_phys_addr(adap, pa, false);
	194	}
	195
	196	void cec_register_cec_notifier(struct cec_adapter *adap,
	197	struct cec_notifier *notifier)
	198	{
	199	if (WARN_ON(!adap->devnode.registered))
	200	return;
	201
	202	adap->notifier = notifier;
	203	cec_notifier_register(adap->notifier, adap, cec_cec_notify);
	204	}
	205	EXPORT_SYMBOL_GPL(cec_register_cec_notifier);
	206	#endif
	207
a56960e8 HV	208	struct cec_adapter cec_allocate_adapter(const struct cec_adap_ops ops,
a56960e8 HV	209	void priv, const char name, u32 caps,
f51e8080	210	u8 available_las)
a56960e8 HV	211	{
	212	struct cec_adapter *adap;
	213	int res;
	214
5f2c467c	215	#ifndef CONFIG_MEDIA_CEC_RC
ee044f5b HV	216	caps &= ~CEC_CAP_RC;
	217	#endif
	218
a56960e8 HV	219	if (WARN_ON(!caps))
	220	return ERR_PTR(-EINVAL);
	221	if (WARN_ON(!ops))
	222	return ERR_PTR(-EINVAL);
	223	if (WARN_ON(!available_las \|\| available_las > CEC_MAX_LOG_ADDRS))
	224	return ERR_PTR(-EINVAL);
	225	adap = kzalloc(sizeof(*adap), GFP_KERNEL);
	226	if (!adap)
	227	return ERR_PTR(-ENOMEM);
a56960e8 HV	228	strlcpy(adap->name, name, sizeof(adap->name));
	229	adap->phys_addr = CEC_PHYS_ADDR_INVALID;
	230	adap->log_addrs.cec_version = CEC_OP_CEC_VERSION_2_0;
	231	adap->log_addrs.vendor_id = CEC_VENDOR_ID_NONE;
	232	adap->capabilities = caps;
	233	adap->available_log_addrs = available_las;
	234	adap->sequence = 0;
	235	adap->ops = ops;
	236	adap->priv = priv;
	237	memset(adap->phys_addrs, 0xff, sizeof(adap->phys_addrs));
	238	mutex_init(&adap->lock);
	239	INIT_LIST_HEAD(&adap->transmit_queue);
	240	INIT_LIST_HEAD(&adap->wait_queue);
	241	init_waitqueue_head(&adap->kthread_waitq);
	242
	243	adap->kthread = kthread_run(cec_thread_func, adap, "cec-%s", name);
	244	if (IS_ERR(adap->kthread)) {
	245	pr_err("cec-%s: kernel_thread() failed\n", name);
	246	res = PTR_ERR(adap->kthread);
	247	kfree(adap);
	248	return ERR_PTR(res);
	249	}
	250
5f2c467c	251	#ifdef CONFIG_MEDIA_CEC_RC
a56960e8 HV	252	if (!(caps & CEC_CAP_RC))
	253	return adap;
	254
a56960e8	255	/* Prepare the RC input device */
0f7499fd	256	adap->rc = rc_allocate_device(RC_DRIVER_SCANCODE);
a56960e8 HV	257	if (!adap->rc) {
	258	pr_err("cec-%s: failed to allocate memory for rc_dev\n",
	259	name);
	260	kthread_stop(adap->kthread);
	261	kfree(adap);
	262	return ERR_PTR(-ENOMEM);
	263	}
	264
	265	snprintf(adap->input_name, sizeof(adap->input_name),
	266	"RC for %s", name);
	267	snprintf(adap->input_phys, sizeof(adap->input_phys),
	268	"%s/input0", name);
	269
	270	adap->rc->input_name = adap->input_name;
	271	adap->rc->input_phys = adap->input_phys;
	272	adap->rc->input_id.bustype = BUS_CEC;
	273	adap->rc->input_id.vendor = 0;
	274	adap->rc->input_id.product = 0;
	275	adap->rc->input_id.version = 1;
a56960e8 HV	276	adap->rc->driver_name = CEC_NAME;
	277	adap->rc->allowed_protocols = RC_BIT_CEC;
	278	adap->rc->priv = adap;
	279	adap->rc->map_name = RC_MAP_CEC;
	280	adap->rc->timeout = MS_TO_NS(100);
a56960e8 HV	281	#endif
	282	return adap;
	283	}
	284	EXPORT_SYMBOL_GPL(cec_allocate_adapter);
	285
f51e8080 HV	286	int cec_register_adapter(struct cec_adapter *adap,
f51e8080 HV	287	struct device *parent)
a56960e8 HV	288	{
	289	int res;
	290
	291	if (IS_ERR_OR_NULL(adap))
	292	return 0;
	293
f51e8080 HV	294	if (WARN_ON(!parent))
	295	return -EINVAL;
	296
	297	adap->owner = parent->driver->owner;
	298	adap->devnode.dev.parent = parent;
	299
5f2c467c	300	#ifdef CONFIG_MEDIA_CEC_RC
a56960e8	301	if (adap->capabilities & CEC_CAP_RC) {
43c0c039	302	adap->rc->dev.parent = parent;
a56960e8 HV	303	res = rc_register_device(adap->rc);
	304
	305	if (res) {
	306	pr_err("cec-%s: failed to prepare input device\n",
	307	adap->name);
	308	rc_free_device(adap->rc);
	309	adap->rc = NULL;
	310	return res;
	311	}
	312	}
	313	#endif
	314
	315	res = cec_devnode_register(&adap->devnode, adap->owner);
	316	if (res) {
5f2c467c	317	#ifdef CONFIG_MEDIA_CEC_RC
a56960e8 HV	318	/* Note: rc_unregister also calls rc_free */
	319	rc_unregister_device(adap->rc);
	320	adap->rc = NULL;
	321	#endif
	322	return res;
	323	}
	324
	325	dev_set_drvdata(&adap->devnode.dev, adap);
20249f84	326	#ifdef CONFIG_DEBUG_FS
a56960e8 HV	327	if (!top_cec_dir)
	328	return 0;
	329
	330	adap->cec_dir = debugfs_create_dir(dev_name(&adap->devnode.dev), top_cec_dir);
	331	if (IS_ERR_OR_NULL(adap->cec_dir)) {
	332	pr_warn("cec-%s: Failed to create debugfs dir\n", adap->name);
	333	return 0;
	334	}
	335	adap->status_file = debugfs_create_devm_seqfile(&adap->devnode.dev,
	336	"status", adap->cec_dir, cec_adap_status);
	337	if (IS_ERR_OR_NULL(adap->status_file)) {
	338	pr_warn("cec-%s: Failed to create status file\n", adap->name);
	339	debugfs_remove_recursive(adap->cec_dir);
	340	adap->cec_dir = NULL;
	341	}
	342	#endif
	343	return 0;
	344	}
	345	EXPORT_SYMBOL_GPL(cec_register_adapter);
	346
	347	void cec_unregister_adapter(struct cec_adapter *adap)
	348	{
	349	if (IS_ERR_OR_NULL(adap))
	350	return;
	351
5f2c467c	352	#ifdef CONFIG_MEDIA_CEC_RC
a56960e8 HV	353	/* Note: rc_unregister also calls rc_free */
	354	rc_unregister_device(adap->rc);
	355	adap->rc = NULL;
	356	#endif
	357	debugfs_remove_recursive(adap->cec_dir);
e94c3281	358	#ifdef CONFIG_CEC_NOTIFIER
e3a93adc HV	359	if (adap->notifier)
	360	cec_notifier_unregister(adap->notifier);
	361	#endif
a56960e8 HV	362	cec_devnode_unregister(&adap->devnode);
	363	}
	364	EXPORT_SYMBOL_GPL(cec_unregister_adapter);
	365
	366	void cec_delete_adapter(struct cec_adapter *adap)
	367	{
	368	if (IS_ERR_OR_NULL(adap))
	369	return;
	370	mutex_lock(&adap->lock);
	371	__cec_s_phys_addr(adap, CEC_PHYS_ADDR_INVALID, false);
	372	mutex_unlock(&adap->lock);
	373	kthread_stop(adap->kthread);
	374	if (adap->kthread_config)
	375	kthread_stop(adap->kthread_config);
5f2c467c	376	#ifdef CONFIG_MEDIA_CEC_RC
d8eddb15	377	rc_free_device(adap->rc);
a56960e8 HV	378	#endif
	379	kfree(adap);
	380	}
	381	EXPORT_SYMBOL_GPL(cec_delete_adapter);
	382
	383	/*
	384	* Initialise cec for linux
	385	*/
	386	static int __init cec_devnode_init(void)
	387	{
	388	int ret;
	389
	390	pr_info("Linux cec interface: v0.10\n");
	391	ret = alloc_chrdev_region(&cec_dev_t, 0, CEC_NUM_DEVICES,
	392	CEC_NAME);
	393	if (ret < 0) {
	394	pr_warn("cec: unable to allocate major\n");
	395	return ret;
	396	}
	397
20249f84	398	#ifdef CONFIG_DEBUG_FS
a56960e8 HV	399	top_cec_dir = debugfs_create_dir("cec", NULL);
	400	if (IS_ERR_OR_NULL(top_cec_dir)) {
	401	pr_warn("cec: Failed to create debugfs cec dir\n");
	402	top_cec_dir = NULL;
	403	}
	404	#endif
	405
	406	ret = bus_register(&cec_bus_type);
	407	if (ret < 0) {
	408	unregister_chrdev_region(cec_dev_t, CEC_NUM_DEVICES);
	409	pr_warn("cec: bus_register failed\n");
	410	return -EIO;
	411	}
	412
	413	return 0;
	414	}
	415
	416	static void __exit cec_devnode_exit(void)
	417	{
	418	debugfs_remove_recursive(top_cec_dir);
	419	bus_unregister(&cec_bus_type);
	420	unregister_chrdev_region(cec_dev_t, CEC_NUM_DEVICES);
	421	}
	422
	423	subsys_initcall(cec_devnode_init);
	424	module_exit(cec_devnode_exit)
	425
	426	MODULE_AUTHOR("Hans Verkuil <hans.verkuil@cisco.com>");
	427	MODULE_DESCRIPTION("Device node registration for cec drivers");
	428	MODULE_LICENSE("GPL");