You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
138 lines
3.5 KiB
138 lines
3.5 KiB
/*
|
|
* cec-notifier.c - notify CEC drivers of physical address changes
|
|
*
|
|
* Copyright 2016 Russell King <rmk+kernel@arm.linux.org.uk>
|
|
* Copyright 2016-2017 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/export.h>
|
|
#include <linux/string.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/list.h>
|
|
#include <linux/kref.h>
|
|
|
|
#include <media/cec.h>
|
|
#include <media/cec-notifier.h>
|
|
#include <drm/drm_edid.h>
|
|
|
|
struct cec_notifier {
|
|
struct mutex lock;
|
|
struct list_head head;
|
|
struct kref kref;
|
|
struct device *dev;
|
|
struct cec_adapter *cec_adap;
|
|
void (*callback)(struct cec_adapter *adap, u16 pa);
|
|
|
|
u16 phys_addr;
|
|
};
|
|
|
|
static LIST_HEAD(cec_notifiers);
|
|
static DEFINE_MUTEX(cec_notifiers_lock);
|
|
|
|
struct cec_notifier *cec_notifier_get(struct device *dev)
|
|
{
|
|
struct cec_notifier *n;
|
|
|
|
mutex_lock(&cec_notifiers_lock);
|
|
list_for_each_entry(n, &cec_notifiers, head) {
|
|
if (n->dev == dev) {
|
|
kref_get(&n->kref);
|
|
mutex_unlock(&cec_notifiers_lock);
|
|
return n;
|
|
}
|
|
}
|
|
n = kzalloc(sizeof(*n), GFP_KERNEL);
|
|
if (!n)
|
|
goto unlock;
|
|
n->dev = dev;
|
|
n->phys_addr = CEC_PHYS_ADDR_INVALID;
|
|
mutex_init(&n->lock);
|
|
kref_init(&n->kref);
|
|
list_add_tail(&n->head, &cec_notifiers);
|
|
unlock:
|
|
mutex_unlock(&cec_notifiers_lock);
|
|
return n;
|
|
}
|
|
EXPORT_SYMBOL_GPL(cec_notifier_get);
|
|
|
|
static void cec_notifier_release(struct kref *kref)
|
|
{
|
|
struct cec_notifier *n =
|
|
container_of(kref, struct cec_notifier, kref);
|
|
|
|
list_del(&n->head);
|
|
kfree(n);
|
|
}
|
|
|
|
void cec_notifier_put(struct cec_notifier *n)
|
|
{
|
|
mutex_lock(&cec_notifiers_lock);
|
|
kref_put(&n->kref, cec_notifier_release);
|
|
mutex_unlock(&cec_notifiers_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(cec_notifier_put);
|
|
|
|
void cec_notifier_set_phys_addr(struct cec_notifier *n, u16 pa)
|
|
{
|
|
if (n == NULL)
|
|
return;
|
|
|
|
mutex_lock(&n->lock);
|
|
n->phys_addr = pa;
|
|
if (n->callback)
|
|
n->callback(n->cec_adap, n->phys_addr);
|
|
mutex_unlock(&n->lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(cec_notifier_set_phys_addr);
|
|
|
|
void cec_notifier_set_phys_addr_from_edid(struct cec_notifier *n,
|
|
const struct edid *edid)
|
|
{
|
|
u16 pa = CEC_PHYS_ADDR_INVALID;
|
|
|
|
if (n == NULL)
|
|
return;
|
|
|
|
if (edid && edid->extensions)
|
|
pa = cec_get_edid_phys_addr((const u8 *)edid,
|
|
EDID_LENGTH * (edid->extensions + 1), NULL);
|
|
cec_notifier_set_phys_addr(n, pa);
|
|
}
|
|
EXPORT_SYMBOL_GPL(cec_notifier_set_phys_addr_from_edid);
|
|
|
|
void cec_notifier_register(struct cec_notifier *n,
|
|
struct cec_adapter *adap,
|
|
void (*callback)(struct cec_adapter *adap, u16 pa))
|
|
{
|
|
kref_get(&n->kref);
|
|
mutex_lock(&n->lock);
|
|
n->cec_adap = adap;
|
|
n->callback = callback;
|
|
n->callback(adap, n->phys_addr);
|
|
mutex_unlock(&n->lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(cec_notifier_register);
|
|
|
|
void cec_notifier_unregister(struct cec_notifier *n)
|
|
{
|
|
mutex_lock(&n->lock);
|
|
n->callback = NULL;
|
|
n->cec_adap->notifier = NULL;
|
|
n->cec_adap = NULL;
|
|
mutex_unlock(&n->lock);
|
|
cec_notifier_put(n);
|
|
}
|
|
EXPORT_SYMBOL_GPL(cec_notifier_unregister);
|
|
|