linux_kernel/drivers/gpu/drm/omapdrm/dss/core.c

/*
 * linux/drivers/video/omap2/dss/core.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 "CORE"

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/seq_file.h>
#include <linux/debugfs.h>
#include <linux/io.h>
#include <linux/device.h>
#include <linux/regulator/consumer.h>
#include <linux/suspend.h>
#include <linux/slab.h>

#include "omapdss.h"
#include "dss.h"
#include "dss_features.h"

static struct {
	struct platform_device *pdev;
} core;

enum omapdss_version omapdss_get_version(void)
{
	struct omap_dss_board_info *pdata = core.pdev->dev.platform_data;
	return pdata->version;
}
EXPORT_SYMBOL(omapdss_get_version);

int dss_dsi_enable_pads(int dsi_id, unsigned lane_mask)
{
	struct omap_dss_board_info *board_data = core.pdev->dev.platform_data;

	if (!board_data->dsi_enable_pads)
		return -ENOENT;

	return board_data->dsi_enable_pads(dsi_id, lane_mask);
}

void dss_dsi_disable_pads(int dsi_id, unsigned lane_mask)
{
	struct omap_dss_board_info *board_data = core.pdev->dev.platform_data;

	if (!board_data->dsi_disable_pads)
		return;

	return board_data->dsi_disable_pads(dsi_id, lane_mask);
}

int dss_set_min_bus_tput(struct device *dev, unsigned long tput)
{
	struct omap_dss_board_info *pdata = core.pdev->dev.platform_data;

	if (pdata->set_min_bus_tput)
		return pdata->set_min_bus_tput(dev, tput);
	else
		return 0;
}

#if defined(CONFIG_OMAP2_DSS_DEBUGFS)
static int dss_debug_show(struct seq_file *s, void *unused)
{
	void (*func)(struct seq_file *) = s->private;
	func(s);
	return 0;
}

static int dss_debug_open(struct inode *inode, struct file *file)
{
	return single_open(file, dss_debug_show, inode->i_private);
}

static const struct file_operations dss_debug_fops = {
	.open           = dss_debug_open,
	.read           = seq_read,
	.llseek         = seq_lseek,
	.release        = single_release,
};

static struct dentry *dss_debugfs_dir;

static int dss_initialize_debugfs(void)
{
	dss_debugfs_dir = debugfs_create_dir("omapdss", NULL);
	if (IS_ERR(dss_debugfs_dir)) {
		int err = PTR_ERR(dss_debugfs_dir);
		dss_debugfs_dir = NULL;
		return err;
	}

	debugfs_create_file("clk", S_IRUGO, dss_debugfs_dir,
			&dss_debug_dump_clocks, &dss_debug_fops);

	return 0;
}

static void dss_uninitialize_debugfs(void)
{
	if (dss_debugfs_dir)
		debugfs_remove_recursive(dss_debugfs_dir);
}

int dss_debugfs_create_file(const char *name, void (*write)(struct seq_file *))
{
	struct dentry *d;

	d = debugfs_create_file(name, S_IRUGO, dss_debugfs_dir,
			write, &dss_debug_fops);

	return PTR_ERR_OR_ZERO(d);
}
#else /* CONFIG_OMAP2_DSS_DEBUGFS */
static inline int dss_initialize_debugfs(void)
{
	return 0;
}
static inline void dss_uninitialize_debugfs(void)
{
}
int dss_debugfs_create_file(const char *name, void (*write)(struct seq_file *))
{
	return 0;
}
#endif /* CONFIG_OMAP2_DSS_DEBUGFS */

/* PLATFORM DEVICE */

static void dss_disable_all_devices(void)
{
	struct omap_dss_device *dssdev = NULL;

	for_each_dss_dev(dssdev) {
		if (!dssdev->driver)
			continue;

		if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
			dssdev->driver->disable(dssdev);
	}
}

static int __init omap_dss_probe(struct platform_device *pdev)
{
	int r;

	core.pdev = pdev;

	dss_features_init(omapdss_get_version());

	r = dss_initialize_debugfs();
	if (r)
		goto err_debugfs;

	return 0;

err_debugfs:

	return r;
}

static int omap_dss_remove(struct platform_device *pdev)
{
	dss_uninitialize_debugfs();

	return 0;
}

static void omap_dss_shutdown(struct platform_device *pdev)
{
	DSSDBG("shutdown\n");
	dss_disable_all_devices();
}

static struct platform_driver omap_dss_driver = {
	.remove         = omap_dss_remove,
	.shutdown	= omap_dss_shutdown,
	.driver         = {
		.name   = "omapdss",
	},
};

/* INIT */
static int (*dss_output_drv_reg_funcs[])(void) __initdata = {
	dss_init_platform_driver,
	dispc_init_platform_driver,
#ifdef CONFIG_OMAP2_DSS_DSI
	dsi_init_platform_driver,
#endif
#ifdef CONFIG_OMAP2_DSS_VENC
	venc_init_platform_driver,
#endif
#ifdef CONFIG_OMAP4_DSS_HDMI
	hdmi4_init_platform_driver,
#endif
#ifdef CONFIG_OMAP5_DSS_HDMI
	hdmi5_init_platform_driver,
#endif
};

static void (*dss_output_drv_unreg_funcs[])(void) = {
#ifdef CONFIG_OMAP5_DSS_HDMI
	hdmi5_uninit_platform_driver,
#endif
#ifdef CONFIG_OMAP4_DSS_HDMI
	hdmi4_uninit_platform_driver,
#endif
#ifdef CONFIG_OMAP2_DSS_VENC
	venc_uninit_platform_driver,
#endif
#ifdef CONFIG_OMAP2_DSS_DSI
	dsi_uninit_platform_driver,
#endif
	dispc_uninit_platform_driver,
	dss_uninit_platform_driver,
};

static int __init omap_dss_init(void)
{
	int r;
	int i;

	r = platform_driver_probe(&omap_dss_driver, omap_dss_probe);
	if (r)
		return r;

	for (i = 0; i < ARRAY_SIZE(dss_output_drv_reg_funcs); ++i) {
		r = dss_output_drv_reg_funcs[i]();
		if (r)
			goto err_reg;
	}

	return 0;

err_reg:
	for (i = ARRAY_SIZE(dss_output_drv_reg_funcs) - i;
			i < ARRAY_SIZE(dss_output_drv_reg_funcs);
			++i)
		dss_output_drv_unreg_funcs[i]();

	platform_driver_unregister(&omap_dss_driver);

	return r;
}

static void __exit omap_dss_exit(void)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(dss_output_drv_unreg_funcs); ++i)
		dss_output_drv_unreg_funcs[i]();

	platform_driver_unregister(&omap_dss_driver);
}

module_init(omap_dss_init);
module_exit(omap_dss_exit);

MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@nokia.com>");
MODULE_DESCRIPTION("OMAP2/3 Display Subsystem");
MODULE_LICENSE("GPL v2");