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