1. 根目录:
2. drivers
3. video
4. omap2
5. dss
6. display.c

/*
 * linux/drivers/video/omap2/dss/display.c
 *
 * Copyright (C) 2009 Nokia Corporation
 * Author: Tomi Valkeinen <tomi.valkeinen@nokia.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 <video/omapdss.h>
#include "dss.h"
#include "dss_features.h"

void omapdss_default_get_resolution(struct omap_dss_device *dssdev,
			u16 *xres, u16 *yres)
{
	*xres = dssdev->panel.timings.x_res;
	*yres = dssdev->panel.timings.y_res;
}
EXPORT_SYMBOL(omapdss_default_get_resolution);

int omapdss_default_get_recommended_bpp(struct omap_dss_device *dssdev)
{
	switch (dssdev->type) {
	case OMAP_DISPLAY_TYPE_DPI:
		if (dssdev->phy.dpi.data_lines == 24)
			return 24;
		else
			return 16;

	case OMAP_DISPLAY_TYPE_DBI:
		if (dssdev->ctrl.pixel_size == 24)
			return 24;
		else
			return 16;
	case OMAP_DISPLAY_TYPE_DSI:
		if (dsi_get_pixel_size(dssdev->panel.dsi_pix_fmt) > 16)
			return 24;
		else
			return 16;
	case OMAP_DISPLAY_TYPE_VENC:
	case OMAP_DISPLAY_TYPE_SDI:
	case OMAP_DISPLAY_TYPE_HDMI:
		return 24;
	default:
		BUG();
		return 0;
	}
}
EXPORT_SYMBOL(omapdss_default_get_recommended_bpp);

void omapdss_default_get_timings(struct omap_dss_device *dssdev,
		struct omap_video_timings *timings)
{
	*timings = dssdev->panel.timings;
}
EXPORT_SYMBOL(omapdss_default_get_timings);

static int dss_suspend_device(struct device *dev, void *data)
{
	struct omap_dss_device *dssdev = to_dss_device(dev);

	if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE) {
		dssdev->activate_after_resume = false;
		return 0;
	}

	dssdev->driver->disable(dssdev);

	dssdev->activate_after_resume = true;

	return 0;
}

int dss_suspend_all_devices(void)
{
	int r;
	struct bus_type *bus = dss_get_bus();

	r = bus_for_each_dev(bus, NULL, NULL, dss_suspend_device);
	if (r) {
		/* resume all displays that were suspended */
		dss_resume_all_devices();
		return r;
	}

	return 0;
}

static int dss_resume_device(struct device *dev, void *data)
{
	int r;
	struct omap_dss_device *dssdev = to_dss_device(dev);

	if (dssdev->activate_after_resume) {
		r = dssdev->driver->enable(dssdev);
		if (r)
			return r;
	}

	dssdev->activate_after_resume = false;

	return 0;
}

int dss_resume_all_devices(void)
{
	struct bus_type *bus = dss_get_bus();

	return bus_for_each_dev(bus, NULL, NULL, dss_resume_device);
}

static int dss_disable_device(struct device *dev, void *data)
{
	struct omap_dss_device *dssdev = to_dss_device(dev);

	if (dssdev->state != OMAP_DSS_DISPLAY_DISABLED)
		dssdev->driver->disable(dssdev);

	return 0;
}

void dss_disable_all_devices(void)
{
	struct bus_type *bus = dss_get_bus();
	bus_for_each_dev(bus, NULL, NULL, dss_disable_device);
}


void omap_dss_get_device(struct omap_dss_device *dssdev)
{
	get_device(&dssdev->dev);
}
EXPORT_SYMBOL(omap_dss_get_device);

void omap_dss_put_device(struct omap_dss_device *dssdev)
{
	put_device(&dssdev->dev);
}
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 device *dev;
	struct device *dev_start = NULL;
	struct omap_dss_device *dssdev = NULL;

	int match(struct device *dev, void *data)
	{
		return 1;
	}

	if (from)
		dev_start = &from->dev;
	dev = bus_find_device(dss_get_bus(), dev_start, NULL, match);
	if (dev)
		dssdev = to_dss_device(dev);
	if (from)
		put_device(&from->dev);

	return dssdev;
}
EXPORT_SYMBOL(omap_dss_get_next_device);

struct omap_dss_device *omap_dss_find_device(void *data,
		int (*match)(struct omap_dss_device *dssdev, void *data))
{
	struct omap_dss_device *dssdev = NULL;

	while ((dssdev = omap_dss_get_next_device(dssdev)) != NULL) {
		if (match(dssdev, data))
			return dssdev;
	}

	return NULL;
}
EXPORT_SYMBOL(omap_dss_find_device);

int omap_dss_start_device(struct omap_dss_device *dssdev)
{
	if (!dssdev->driver) {
		DSSDBG("no driver\n");
		return -ENODEV;
	}

	if (!try_module_get(dssdev->dev.driver->owner)) {
		return -ENODEV;
	}

	return 0;
}
EXPORT_SYMBOL(omap_dss_start_device);

void omap_dss_stop_device(struct omap_dss_device *dssdev)
{
	module_put(dssdev->dev.driver->owner);
}
EXPORT_SYMBOL(omap_dss_stop_device);