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/*

 *  output.c - Display Output Switch driver

 *

 *  Copyright (C) 2006 Luming Yu <luming.yu@intel.com>

 *

 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License as published by

 *  the Free Software Foundation; either version 2 of the License, or (at

 *  your option) any later version.

 *

 *  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, write to the Free Software Foundation, Inc.,

 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

 *

 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 */

#include <linux/module.h>

#include <linux/video_output.h>

#include <linux/err.h>

#include <linux/ctype.h>

MODULE_DESCRIPTION("Display Output Switcher Lowlevel Control Abstraction");

MODULE_LICENSE("GPL");

MODULE_AUTHOR("Luming Yu <luming.yu@intel.com>");

static ssize_t video_output_show_state(struct device *dev,

                                       struct device_attribute *attr, char *buf)

{

        ssize_t ret_size = 0;

        struct output_device *od = to_output_device(dev);

        if (od->props)

                ret_size = sprintf(buf,"%.8x\n",od->props->get_status(od));

        return ret_size;

}

static ssize_t video_output_store_state(struct device *dev,

                                        struct device_attribute *attr,

                                        const char *buf,size_t count)

{

        char *endp;

        struct output_device *od = to_output_device(dev);

        int request_state = simple_strtoul(buf,&endp,0);

        size_t size = endp - buf;

        if (*endp && isspace(*endp))

                size++;

        if (size != count)

                return -EINVAL;

        if (od->props) {

                od->request_state = request_state;

                od->props->set_state(od);

        }

        return count;

}

static void video_output_release(struct device *dev)

{

        struct output_device *od = to_output_device(dev);

        kfree(od);

}

static struct device_attribute video_output_attributes[] = {

        __ATTR(state, 0644, video_output_show_state, video_output_store_state),

        __ATTR_NULL,

};

static struct class video_output_class = {

        .name = "video_output",

        .dev_release = video_output_release,

        .dev_attrs = video_output_attributes,

};

struct output_device *video_output_register(const char *name,

        struct device *dev,

        void *devdata,

        struct output_properties *op)

{

        struct output_device *new_dev;

        int ret_code = 0;

        new_dev = kzalloc(sizeof(struct output_device),GFP_KERNEL);

        if (!new_dev) {

                ret_code = -ENOMEM;

                goto error_return;

        }

        new_dev->props = op;

        new_dev->dev.class = &video_output_class;

        new_dev->dev.parent = dev;

        strlcpy(new_dev->dev.bus_id,name, BUS_ID_SIZE);

        dev_set_drvdata(&new_dev->dev, devdata);

        ret_code = device_register(&new_dev->dev);

        if (ret_code) {

                kfree(new_dev);

                goto error_return;

        }

        return new_dev;

error_return:

        return ERR_PTR(ret_code);

}

EXPORT_SYMBOL(video_output_register);

void video_output_unregister(struct output_device *dev)

{

        if (!dev)

                return;

        device_unregister(&dev->dev);

}

EXPORT_SYMBOL(video_output_unregister);

static void __exit video_output_class_exit(void)

{

        class_unregister(&video_output_class);

}

static int __init video_output_class_init(void)

{

        return class_register(&video_output_class);

}

postcore_initcall(video_output_class_init);

module_exit(video_output_class_exit);