/*
 * 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 "OVERLAY"

#include <linux/module.h>
#include <linux/err.h>
#include <linux/sysfs.h>
#include <linux/kobject.h>
#include <linux/platform_device.h>

#include <video/omapdss.h>

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

static ssize_t overlay_name_show(struct omap_overlay *ovl, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%s\n", ovl->name);
}

static ssize_t overlay_manager_show(struct omap_overlay *ovl, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%s\n",
			ovl->manager ? ovl->manager->name : "<none>");
}

static ssize_t overlay_manager_store(struct omap_overlay *ovl, const char *buf,
		size_t size)
{
	int i, r;
	struct omap_overlay_manager *mgr = NULL;
	struct omap_overlay_manager *old_mgr;
	int len = size;

	if (buf[size-1] == '\n')
		--len;

	if (len > 0) {
		for (i = 0; i < omap_dss_get_num_overlay_managers(); ++i) {
			mgr = omap_dss_get_overlay_manager(i);

			if (sysfs_streq(buf, mgr->name))
				break;

			mgr = NULL;
		}
	}

	if (len > 0 && mgr == NULL)
		return -EINVAL;

	if (mgr)
		DSSDBG("manager %s found\n", mgr->name);

	if (mgr == ovl->manager)
		return size;

	old_mgr = ovl->manager;

	r = dispc_runtime_get();
	if (r)
		return r;

	/* detach old manager */
	if (old_mgr) {
		r = ovl->unset_manager(ovl);
		if (r) {
			DSSERR("detach failed\n");
			goto err;
		}

		r = old_mgr->apply(old_mgr);
		if (r)
			goto err;
	}

	if (mgr) {
		r = ovl->set_manager(ovl, mgr);
		if (r) {
			DSSERR("Failed to attach overlay\n");
			goto err;
		}

		r = mgr->apply(mgr);
		if (r)
			goto err;
	}

	dispc_runtime_put();

	return size;

err:
	dispc_runtime_put();
	return r;
}

static ssize_t overlay_input_size_show(struct omap_overlay *ovl, char *buf)
{
	struct omap_overlay_info info;

	ovl->get_overlay_info(ovl, &info);

	return snprintf(buf, PAGE_SIZE, "%d,%d\n",
			info.width, info.height);
}

static ssize_t overlay_screen_width_show(struct omap_overlay *ovl, char *buf)
{
	struct omap_overlay_info info;

	ovl->get_overlay_info(ovl, &info);

	return snprintf(buf, PAGE_SIZE, "%d\n", info.screen_width);
}

static ssize_t overlay_position_show(struct omap_overlay *ovl, char *buf)
{
	struct omap_overlay_info info;

	ovl->get_overlay_info(ovl, &info);

	return snprintf(buf, PAGE_SIZE, "%d,%d\n",
			info.pos_x, info.pos_y);
}

static ssize_t overlay_position_store(struct omap_overlay *ovl,
		const char *buf, size_t size)
{
	int r;
	char *last;
	struct omap_overlay_info info;

	ovl->get_overlay_info(ovl, &info);

	info.pos_x = simple_strtoul(buf, &last, 10);
	++last;
	if (last - buf >= size)
		return -EINVAL;

	info.pos_y = simple_strtoul(last, &last, 10);

	r = ovl->set_overlay_info(ovl, &info);
	if (r)
		return r;

	if (ovl->manager) {
		r = ovl->manager->apply(ovl->manager);
		if (r)
			return r;
	}

	return size;
}

static ssize_t overlay_output_size_show(struct omap_overlay *ovl, char *buf)
{
	struct omap_overlay_info info;

	ovl->get_overlay_info(ovl, &info);

	return snprintf(buf, PAGE_SIZE, "%d,%d\n",
			info.out_width, info.out_height);
}

static ssize_t overlay_output_size_store(struct omap_overlay *ovl,
		const char *buf, size_t size)
{
	int r;
	char *last;
	struct omap_overlay_info info;

	ovl->get_overlay_info(ovl, &info);

	info.out_width = simple_strtoul(buf, &last, 10);
	++last;
	if (last - buf >= size)
		return -EINVAL;

	info.out_height = simple_strtoul(last, &last, 10);

	r = ovl->set_overlay_info(ovl, &info);
	if (r)
		return r;

	if (ovl->manager) {
		r = ovl->manager->apply(ovl->manager);
		if (r)
			return r;
	}

	return size;
}

static ssize_t overlay_enabled_show(struct omap_overlay *ovl, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%d\n", ovl->is_enabled(ovl));
}

static ssize_t overlay_enabled_store(struct omap_overlay *ovl, const char *buf,
		size_t size)
{
	int r;
	bool enable;

	r = strtobool(buf, &enable);
	if (r)
		return r;

	if (enable)
		r = ovl->enable(ovl);
	else
		r = ovl->disable(ovl);

	if (r)
		return r;

	return size;
}

static ssize_t overlay_global_alpha_show(struct omap_overlay *ovl, char *buf)
{
	struct omap_overlay_info info;

	ovl->get_overlay_info(ovl, &info);

	return snprintf(buf, PAGE_SIZE, "%d\n",
			info.global_alpha);
}

static ssize_t overlay_global_alpha_store(struct omap_overlay *ovl,
		const char *buf, size_t size)
{
	int r;
	u8 alpha;
	struct omap_overlay_info info;

	if ((ovl->caps & OMAP_DSS_OVL_CAP_GLOBAL_ALPHA) == 0)
		return -ENODEV;

	r = kstrtou8(buf, 0, &alpha);
	if (r)
		return r;

	ovl->get_overlay_info(ovl, &info);

	info.global_alpha = alpha;

	r = ovl->set_overlay_info(ovl, &info);
	if (r)
		return r;

	if (ovl->manager) {
		r = ovl->manager->apply(ovl->manager);
		if (r)
			return r;
	}

	return size;
}

static ssize_t overlay_pre_mult_alpha_show(struct omap_overlay *ovl,
		char *buf)
{
	struct omap_overlay_info info;

	ovl->get_overlay_info(ovl, &info);

	return snprintf(buf, PAGE_SIZE, "%d\n",
			info.pre_mult_alpha);
}

static ssize_t overlay_pre_mult_alpha_store(struct omap_overlay *ovl,
		const char *buf, size_t size)
{
	int r;
	u8 alpha;
	struct omap_overlay_info info;

	if ((ovl->caps & OMAP_DSS_OVL_CAP_PRE_MULT_ALPHA) == 0)
		return -ENODEV;

	r = kstrtou8(buf, 0, &alpha);
	if (r)
		return r;

	ovl->get_overlay_info(ovl, &info);

	info.pre_mult_alpha = alpha;

	r = ovl->set_overlay_info(ovl, &info);
	if (r)
		return r;

	if (ovl->manager) {
		r = ovl->manager->apply(ovl->manager);
		if (r)
			return r;
	}

	return size;
}

static ssize_t overlay_zorder_show(struct omap_overlay *ovl, char *buf)
{
	struct omap_overlay_info info;

	ovl->get_overlay_info(ovl, &info);

	return snprintf(buf, PAGE_SIZE, "%d\n", info.zorder);
}

static ssize_t overlay_zorder_store(struct omap_overlay *ovl,
		const char *buf, size_t size)
{
	int r;
	u8 zorder;
	struct omap_overlay_info info;

	if ((ovl->caps & OMAP_DSS_OVL_CAP_ZORDER) == 0)
		return -ENODEV;

	r = kstrtou8(buf, 0, &zorder);
	if (r)
		return r;

	ovl->get_overlay_info(ovl, &info);

	info.zorder = zorder;

	r = ovl->set_overlay_info(ovl, &info);
	if (r)
		return r;

	if (ovl->manager) {
		r = ovl->manager->apply(ovl->manager);
		if (r)
			return r;
	}

	return size;
}

struct overlay_attribute {
	struct attribute attr;
	ssize_t (*show)(struct omap_overlay *, char *);
	ssize_t	(*store)(struct omap_overlay *, const char *, size_t);
};

#define OVERLAY_ATTR(_name, _mode, _show, _store) \
	struct overlay_attribute overlay_attr_##_name = \
	__ATTR(_name, _mode, _show, _store)

static OVERLAY_ATTR(name, S_IRUGO, overlay_name_show, NULL);
static OVERLAY_ATTR(manager, S_IRUGO|S_IWUSR,
		overlay_manager_show, overlay_manager_store);
static OVERLAY_ATTR(input_size, S_IRUGO, overlay_input_size_show, NULL);
static OVERLAY_ATTR(screen_width, S_IRUGO, overlay_screen_width_show, NULL);
static OVERLAY_ATTR(position, S_IRUGO|S_IWUSR,
		overlay_position_show, overlay_position_store);
static OVERLAY_ATTR(output_size, S_IRUGO|S_IWUSR,
		overlay_output_size_show, overlay_output_size_store);
static OVERLAY_ATTR(enabled, S_IRUGO|S_IWUSR,
		overlay_enabled_show, overlay_enabled_store);
static OVERLAY_ATTR(global_alpha, S_IRUGO|S_IWUSR,
		overlay_global_alpha_show, overlay_global_alpha_store);
static OVERLAY_ATTR(pre_mult_alpha, S_IRUGO|S_IWUSR,
		overlay_pre_mult_alpha_show,
		overlay_pre_mult_alpha_store);
static OVERLAY_ATTR(zorder, S_IRUGO|S_IWUSR,
		overlay_zorder_show, overlay_zorder_store);

static struct attribute *overlay_sysfs_attrs[] = {
	&overlay_attr_name.attr,
	&overlay_attr_manager.attr,
	&overlay_attr_input_size.attr,
	&overlay_attr_screen_width.attr,
	&overlay_attr_position.attr,
	&overlay_attr_output_size.attr,
	&overlay_attr_enabled.attr,
	&overlay_attr_global_alpha.attr,
	&overlay_attr_pre_mult_alpha.attr,
	&overlay_attr_zorder.attr,
	NULL
};

static ssize_t overlay_attr_show(struct kobject *kobj, struct attribute *attr,
		char *buf)
{
	struct omap_overlay *overlay;
	struct overlay_attribute *overlay_attr;

	overlay = container_of(kobj, struct omap_overlay, kobj);
	overlay_attr = container_of(attr, struct overlay_attribute, attr);

	if (!overlay_attr->show)
		return -ENOENT;

	return overlay_attr->show(overlay, buf);
}

static ssize_t overlay_attr_store(struct kobject *kobj, struct attribute *attr,
		const char *buf, size_t size)
{
	struct omap_overlay *overlay;
	struct overlay_attribute *overlay_attr;

	overlay = container_of(kobj, struct omap_overlay, kobj);
	overlay_attr = container_of(attr, struct overlay_attribute, attr);

	if (!overlay_attr->store)
		return -ENOENT;

	return overlay_attr->store(overlay, buf, size);
}

static const struct sysfs_ops overlay_sysfs_ops = {
	.show = overlay_attr_show,
	.store = overlay_attr_store,
};

static struct kobj_type overlay_ktype = {
	.sysfs_ops = &overlay_sysfs_ops,
	.default_attrs = overlay_sysfs_attrs,
};

int dss_overlay_kobj_init(struct omap_overlay *ovl,
		struct platform_device *pdev)
{
	return kobject_init_and_add(&ovl->kobj, &overlay_ktype,
			&pdev->dev.kobj, "overlay%d", ovl->id);
}

void dss_overlay_kobj_uninit(struct omap_overlay *ovl)
{
	kobject_del(&ovl->kobj);
	kobject_put(&ovl->kobj);
}