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/*
* Copyright (C) 2009 Nokia Corporation
* Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
*
* Some code and ideas taken from drivers/video/omap/ driver
* by Imre Deak.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#define DSS_SUBSYS_NAME "DISPLAY"
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/jiffies.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include "omapdss.h"
static LIST_HEAD(panel_list);
static DEFINE_MUTEX(panel_list_mutex);
static int disp_num_counter;
int omapdss_register_display(struct omap_dss_device *dssdev)
{
int id;
/*
* Note: this presumes that all displays either have an DT alias, or
* none has.
*/
id = of_alias_get_id(dssdev->dev->of_node, "display");
if (id < 0)
id = disp_num_counter++;
dssdev->alias_id = id;
/* Use 'label' property for name, if it exists */
of_property_read_string(dssdev->dev->of_node, "label", &dssdev->name);
if (dssdev->name == NULL)
dssdev->name = devm_kasprintf(dssdev->dev, GFP_KERNEL,
"display%u", id);
mutex_lock(&panel_list_mutex);
list_add_tail(&dssdev->panel_list, &panel_list);
mutex_unlock(&panel_list_mutex);
omapdss_device_register(dssdev);
return 0;
}
EXPORT_SYMBOL(omapdss_register_display);
void omapdss_unregister_display(struct omap_dss_device *dssdev)
{
mutex_lock(&panel_list_mutex);
list_del(&dssdev->panel_list);
mutex_unlock(&panel_list_mutex);
omapdss_device_register(dssdev);
}
EXPORT_SYMBOL(omapdss_unregister_display);
struct omap_dss_device *omap_dss_get_device(struct omap_dss_device *dssdev)
{
if (!try_module_get(dssdev->owner))
return NULL;
if (get_device(dssdev->dev) == NULL) {
module_put(dssdev->owner);
return NULL;
}
return dssdev;
}
EXPORT_SYMBOL(omap_dss_get_device);
void omap_dss_put_device(struct omap_dss_device *dssdev)
{
put_device(dssdev->dev);
module_put(dssdev->owner);
}
EXPORT_SYMBOL(omap_dss_put_device);
/*
* ref count of the found device is incremented.
* ref count of from-device is decremented.
*/
struct omap_dss_device *omap_dss_get_next_device(struct omap_dss_device *from)
{
struct list_head *l;
struct omap_dss_device *dssdev;
mutex_lock(&panel_list_mutex);
if (list_empty(&panel_list)) {
dssdev = NULL;
goto out;
}
if (from == NULL) {
dssdev = list_first_entry(&panel_list, struct omap_dss_device,
panel_list);
omap_dss_get_device(dssdev);
goto out;
}
omap_dss_put_device(from);
list_for_each(l, &panel_list) {
dssdev = list_entry(l, struct omap_dss_device, panel_list);
if (dssdev == from) {
if (list_is_last(l, &panel_list)) {
dssdev = NULL;
goto out;
}
dssdev = list_entry(l->next, struct omap_dss_device,
panel_list);
omap_dss_get_device(dssdev);
goto out;
}
}
WARN(1, "'from' dssdev not found\n");
dssdev = NULL;
out:
mutex_unlock(&panel_list_mutex);
return dssdev;
}
EXPORT_SYMBOL(omap_dss_get_next_device);
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