/*
 * 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 "MANAGER"

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/jiffies.h>

#include <video/omapdss.h>

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

static ssize_t manager_name_show(struct omap_overlay_manager *mgr, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%s\n", mgr->name);
}

static ssize_t manager_display_show(struct omap_overlay_manager *mgr, char *buf)
{
	struct omap_dss_device *dssdev = mgr->get_device(mgr);

	return snprintf(buf, PAGE_SIZE, "%s\n", dssdev ?
			dssdev->name : "<none>");
}

static ssize_t manager_display_store(struct omap_overlay_manager *mgr,
		const char *buf, size_t size)
{
	int r = 0;
	size_t len = size;
	struct omap_dss_device *dssdev = NULL;
	struct omap_dss_device *old_dssdev;

	int match(struct omap_dss_device *dssdev, void *data)
	{
		const char *str = data;
		return sysfs_streq(dssdev->name, str);
	}

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

	if (len > 0)
		dssdev = omap_dss_find_device((void *)buf, match);

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

	if (dssdev) {
		DSSDBG("display %s found\n", dssdev->name);

		if (omapdss_device_is_connected(dssdev)) {
			DSSERR("new display is already connected\n");
			r = -EINVAL;
			goto put_device;
		}

		if (omapdss_device_is_enabled(dssdev)) {
			DSSERR("new display is not disabled\n");
			r = -EINVAL;
			goto put_device;
		}
	}

	old_dssdev = mgr->get_device(mgr);
	if (old_dssdev) {
		if (omapdss_device_is_enabled(old_dssdev)) {
			DSSERR("old display is not disabled\n");
			r = -EINVAL;
			goto put_device;
		}

		old_dssdev->driver->disconnect(old_dssdev);
	}

	if (dssdev) {
		r = dssdev->driver->connect(dssdev);
		if (r) {
			DSSERR("failed to connect new device\n");
			goto put_device;
		}

		old_dssdev = mgr->get_device(mgr);
		if (old_dssdev != dssdev) {
			DSSERR("failed to connect device to this manager\n");
			dssdev->driver->disconnect(dssdev);
			goto put_device;
		}

		r = mgr->apply(mgr);
		if (r) {
			DSSERR("failed to apply dispc config\n");
			goto put_device;
		}
	}

put_device:
	if (dssdev)
		omap_dss_put_device(dssdev);

	return r ? r : size;
}

static ssize_t manager_default_color_show(struct omap_overlay_manager *mgr,
					  char *buf)
{
	struct omap_overlay_manager_info info;

	mgr->get_manager_info(mgr, &info);

	return snprintf(buf, PAGE_SIZE, "%#x\n", info.default_color);
}

static ssize_t manager_default_color_store(struct omap_overlay_manager *mgr,
					   const char *buf, size_t size)
{
	struct omap_overlay_manager_info info;
	u32 color;
	int r;

	r = kstrtouint(buf, 0, &color);
	if (r)
		return r;

	mgr->get_manager_info(mgr, &info);

	info.default_color = color;

	r = mgr->set_manager_info(mgr, &info);
	if (r)
		return r;

	r = mgr->apply(mgr);
	if (r)
		return r;

	return size;
}

static const char *trans_key_type_str[] = {
	"gfx-destination",
	"video-source",
};

static ssize_t manager_trans_key_type_show(struct omap_overlay_manager *mgr,
					   char *buf)
{
	enum omap_dss_trans_key_type key_type;
	struct omap_overlay_manager_info info;

	mgr->get_manager_info(mgr, &info);

	key_type = info.trans_key_type;
	BUG_ON(key_type >= ARRAY_SIZE(trans_key_type_str));

	return snprintf(buf, PAGE_SIZE, "%s\n", trans_key_type_str[key_type]);
}

static ssize_t manager_trans_key_type_store(struct omap_overlay_manager *mgr,
					    const char *buf, size_t size)
{
	enum omap_dss_trans_key_type key_type;
	struct omap_overlay_manager_info info;
	int r;

	for (key_type = OMAP_DSS_COLOR_KEY_GFX_DST;
			key_type < ARRAY_SIZE(trans_key_type_str); key_type++) {
		if (sysfs_streq(buf, trans_key_type_str[key_type]))
			break;
	}

	if (key_type == ARRAY_SIZE(trans_key_type_str))
		return -EINVAL;

	mgr->get_manager_info(mgr, &info);

	info.trans_key_type = key_type;

	r = mgr->set_manager_info(mgr, &info);
	if (r)
		return r;

	r = mgr->apply(mgr);
	if (r)
		return r;

	return size;
}

static ssize_t manager_trans_key_value_show(struct omap_overlay_manager *mgr,
					    char *buf)
{
	struct omap_overlay_manager_info info;

	mgr->get_manager_info(mgr, &info);

	return snprintf(buf, PAGE_SIZE, "%#x\n", info.trans_key);
}

static ssize_t manager_trans_key_value_store(struct omap_overlay_manager *mgr,
					     const char *buf, size_t size)
{
	struct omap_overlay_manager_info info;
	u32 key_value;
	int r;

	r = kstrtouint(buf, 0, &key_value);
	if (r)
		return r;

	mgr->get_manager_info(mgr, &info);

	info.trans_key = key_value;

	r = mgr->set_manager_info(mgr, &info);
	if (r)
		return r;

	r = mgr->apply(mgr);
	if (r)
		return r;

	return size;
}

static ssize_t manager_trans_key_enabled_show(struct omap_overlay_manager *mgr,
					      char *buf)
{
	struct omap_overlay_manager_info info;

	mgr->get_manager_info(mgr, &info);

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

static ssize_t manager_trans_key_enabled_store(struct omap_overlay_manager *mgr,
					       const char *buf, size_t size)
{
	struct omap_overlay_manager_info info;
	bool enable;
	int r;

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

	mgr->get_manager_info(mgr, &info);

	info.trans_enabled = enable;

	r = mgr->set_manager_info(mgr, &info);
	if (r)
		return r;

	r = mgr->apply(mgr);
	if (r)
		return r;

	return size;
}

static ssize_t manager_alpha_blending_enabled_show(
		struct omap_overlay_manager *mgr, char *buf)
{
	struct omap_overlay_manager_info info;

	if(!dss_has_feature(FEAT_ALPHA_FIXED_ZORDER))
		return -ENODEV;

	mgr->get_manager_info(mgr, &info);

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

static ssize_t manager_alpha_blending_enabled_store(
		struct omap_overlay_manager *mgr,
		const char *buf, size_t size)
{
	struct omap_overlay_manager_info info;
	bool enable;
	int r;

	if(!dss_has_feature(FEAT_ALPHA_FIXED_ZORDER))
		return -ENODEV;

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

	mgr->get_manager_info(mgr, &info);

	info.partial_alpha_enabled = enable;

	r = mgr->set_manager_info(mgr, &info);
	if (r)
		return r;

	r = mgr->apply(mgr);
	if (r)
		return r;

	return size;
}

static ssize_t manager_cpr_enable_show(struct omap_overlay_manager *mgr,
		char *buf)
{
	struct omap_overlay_manager_info info;

	mgr->get_manager_info(mgr, &info);

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

static ssize_t manager_cpr_enable_store(struct omap_overlay_manager *mgr,
		const char *buf, size_t size)
{
	struct omap_overlay_manager_info info;
	int r;
	bool enable;

	if (!dss_has_feature(FEAT_CPR))
		return -ENODEV;

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

	mgr->get_manager_info(mgr, &info);

	if (info.cpr_enable == enable)
		return size;

	info.cpr_enable = enable;

	r = mgr->set_manager_info(mgr, &info);
	if (r)
		return r;

	r = mgr->apply(mgr);
	if (r)
		return r;

	return size;
}

static ssize_t manager_cpr_coef_show(struct omap_overlay_manager *mgr,
		char *buf)
{
	struct omap_overlay_manager_info info;

	mgr->get_manager_info(mgr, &info);

	return snprintf(buf, PAGE_SIZE,
			"%d %d %d %d %d %d %d %d %d\n",
			info.cpr_coefs.rr,
			info.cpr_coefs.rg,
			info.cpr_coefs.rb,
			info.cpr_coefs.gr,
			info.cpr_coefs.gg,
			info.cpr_coefs.gb,
			info.cpr_coefs.br,
			info.cpr_coefs.bg,
			info.cpr_coefs.bb);
}

static ssize_t manager_cpr_coef_store(struct omap_overlay_manager *mgr,
		const char *buf, size_t size)
{
	struct omap_overlay_manager_info info;
	struct omap_dss_cpr_coefs coefs;
	int r, i;
	s16 *arr;

	if (!dss_has_feature(FEAT_CPR))
		return -ENODEV;

	if (sscanf(buf, "%hd %hd %hd %hd %hd %hd %hd %hd %hd",
				&coefs.rr, &coefs.rg, &coefs.rb,
				&coefs.gr, &coefs.gg, &coefs.gb,
				&coefs.br, &coefs.bg, &coefs.bb) != 9)
		return -EINVAL;

	arr = (s16[]){ coefs.rr, coefs.rg, coefs.rb,
		coefs.gr, coefs.gg, coefs.gb,
		coefs.br, coefs.bg, coefs.bb };

	for (i = 0; i < 9; ++i) {
		if (arr[i] < -512 || arr[i] > 511)
			return -EINVAL;
	}

	mgr->get_manager_info(mgr, &info);

	info.cpr_coefs = coefs;

	r = mgr->set_manager_info(mgr, &info);
	if (r)
		return r;

	r = mgr->apply(mgr);
	if (r)
		return r;

	return size;
}

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

#define MANAGER_ATTR(_name, _mode, _show, _store) \
	struct manager_attribute manager_attr_##_name = \
	__ATTR(_name, _mode, _show, _store)

static MANAGER_ATTR(name, S_IRUGO, manager_name_show, NULL);
static MANAGER_ATTR(display, S_IRUGO|S_IWUSR,
		manager_display_show, manager_display_store);
static MANAGER_ATTR(default_color, S_IRUGO|S_IWUSR,
		manager_default_color_show, manager_default_color_store);
static MANAGER_ATTR(trans_key_type, S_IRUGO|S_IWUSR,
		manager_trans_key_type_show, manager_trans_key_type_store);
static MANAGER_ATTR(trans_key_value, S_IRUGO|S_IWUSR,
		manager_trans_key_value_show, manager_trans_key_value_store);
static MANAGER_ATTR(trans_key_enabled, S_IRUGO|S_IWUSR,
		manager_trans_key_enabled_show,
		manager_trans_key_enabled_store);
static MANAGER_ATTR(alpha_blending_enabled, S_IRUGO|S_IWUSR,
		manager_alpha_blending_enabled_show,
		manager_alpha_blending_enabled_store);
static MANAGER_ATTR(cpr_enable, S_IRUGO|S_IWUSR,
		manager_cpr_enable_show,
		manager_cpr_enable_store);
static MANAGER_ATTR(cpr_coef, S_IRUGO|S_IWUSR,
		manager_cpr_coef_show,
		manager_cpr_coef_store);


static struct attribute *manager_sysfs_attrs[] = {
	&manager_attr_name.attr,
	&manager_attr_display.attr,
	&manager_attr_default_color.attr,
	&manager_attr_trans_key_type.attr,
	&manager_attr_trans_key_value.attr,
	&manager_attr_trans_key_enabled.attr,
	&manager_attr_alpha_blending_enabled.attr,
	&manager_attr_cpr_enable.attr,
	&manager_attr_cpr_coef.attr,
	NULL
};

static ssize_t manager_attr_show(struct kobject *kobj, struct attribute *attr,
		char *buf)
{
	struct omap_overlay_manager *manager;
	struct manager_attribute *manager_attr;

	manager = container_of(kobj, struct omap_overlay_manager, kobj);
	manager_attr = container_of(attr, struct manager_attribute, attr);

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

	return manager_attr->show(manager, buf);
}

static ssize_t manager_attr_store(struct kobject *kobj, struct attribute *attr,
		const char *buf, size_t size)
{
	struct omap_overlay_manager *manager;
	struct manager_attribute *manager_attr;

	manager = container_of(kobj, struct omap_overlay_manager, kobj);
	manager_attr = container_of(attr, struct manager_attribute, attr);

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

	return manager_attr->store(manager, buf, size);
}

static const struct sysfs_ops manager_sysfs_ops = {
	.show = manager_attr_show,
	.store = manager_attr_store,
};

static struct kobj_type manager_ktype = {
	.sysfs_ops = &manager_sysfs_ops,
	.default_attrs = manager_sysfs_attrs,
};

int dss_manager_kobj_init(struct omap_overlay_manager *mgr,
		struct platform_device *pdev)
{
	return kobject_init_and_add(&mgr->kobj, &manager_ktype,
			&pdev->dev.kobj, "manager%d", mgr->id);
}

void dss_manager_kobj_uninit(struct omap_overlay_manager *mgr)
{
	kobject_del(&mgr->kobj);
	kobject_put(&mgr->kobj);

	memset(&mgr->kobj, 0, sizeof(mgr->kobj));
}