Re: [patch 11/19] Add display output class support

[Len Brown <lenb@kernel.org>]

Applied to acpi-test.

thanks
-Len

On Tuesday 19 December 2006 15:56, akpm@osdl.org wrote:
> From: Yu Luming <luming.yu@gmail.com>
> 
> Add generic abstract layer for display output switch control.  The output
> sysfs class driver provides an abstract video output layer that can be used to
> hook platform specific methods to enable/disable video output device through
> common sysfs interface.
> 
> Signed-off-by: Luming Yu <Luming.yu@intel.com>
> Cc: "Antonino A. Daplas" <adaplas@pol.net>
> Cc: "Brown, Len" <len.brown@intel.com>
> Cc: Greg KH <greg@kroah.com>
> Signed-off-by: Andrew Morton <akpm@osdl.org>
> ---
> 
>  drivers/video/output.c       |  129 +++++++++++++++++++++++++++++++++
>  include/linux/video_output.h |   42 ++++++++++
>  2 files changed, 171 insertions(+)
> 
> diff -puN /dev/null drivers/video/output.c
> --- /dev/null
> +++ a/drivers/video/output.c
> @@ -0,0 +1,129 @@
> +/*
> + *  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 class_device *dev,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 class_device *dev,
> +	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_class_release(struct class_device *dev)
> +{
> +	struct output_device *od = to_output_device(dev);
> +	kfree(od);
> +}
> +
> +static struct class_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",
> +	.release = video_output_class_release,
> +	.class_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->class_dev.class = &video_output_class;
> +	new_dev->class_dev.dev = dev;
> +	strlcpy(new_dev->class_dev.class_id,name,KOBJ_NAME_LEN);
> +	class_set_devdata(&new_dev->class_dev,devdata);
> +	ret_code = class_device_register(&new_dev->class_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;
> +	class_device_unregister(&dev->class_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);
> diff -puN /dev/null include/linux/video_output.h
> --- /dev/null
> +++ a/include/linux/video_output.h
> @@ -0,0 +1,42 @@
> +/*
> + *
> + *  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.
> + *
> + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> + */
> +#ifndef _LINUX_VIDEO_OUTPUT_H
> +#define _LINUX_VIDEO_OUTPUT_H
> +#include <linux/device.h>
> +struct output_device;
> +struct output_properties {
> +	int (*set_state)(struct output_device *);
> +	int (*get_status)(struct output_device *);
> +};
> +struct output_device {
> +	int request_state;
> +	struct output_properties *props;
> +	struct class_device class_dev;
> +};
> +#define to_output_device(obj) container_of(obj, struct output_device, class_dev)
> +struct output_device *video_output_register(const char *name,
> +	struct device *dev,
> +	void *devdata,
> +	struct output_properties *op);
> +void video_output_unregister(struct output_device *dev);
> +#endif
> _
> -
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