[linux.git] / drivers / acpi / bgrt.c

/*
 * Copyright 2012 Red Hat, Inc <[email protected]>
 * Copyright 2012 Intel Corporation
 *
 * 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.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/sysfs.h>
#include <linux/efi-bgrt.h>

static struct kobject *bgrt_kobj;

static ssize_t show_version(struct device *dev,
			    struct device_attribute *attr, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->version);
}
static DEVICE_ATTR(version, S_IRUGO, show_version, NULL);

static ssize_t show_status(struct device *dev,
			   struct device_attribute *attr, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->status);
}
static DEVICE_ATTR(status, S_IRUGO, show_status, NULL);

static ssize_t show_type(struct device *dev,
			 struct device_attribute *attr, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_type);
}
static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);

static ssize_t show_xoffset(struct device *dev,
			    struct device_attribute *attr, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_offset_x);
}
static DEVICE_ATTR(xoffset, S_IRUGO, show_xoffset, NULL);

static ssize_t show_yoffset(struct device *dev,
			    struct device_attribute *attr, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_offset_y);
}
static DEVICE_ATTR(yoffset, S_IRUGO, show_yoffset, NULL);

static ssize_t show_image(struct file *file, struct kobject *kobj,
	       struct bin_attribute *attr, char *buf, loff_t off, size_t count)
{
	memcpy(buf, attr->private + off, count);
	return count;
}

static struct bin_attribute image_attr = {
	.attr = {
		.name = "image",
		.mode = S_IRUGO,
	},
	.read = show_image,
};

static struct attribute *bgrt_attributes[] = {
	&dev_attr_version.attr,
	&dev_attr_status.attr,
	&dev_attr_type.attr,
	&dev_attr_xoffset.attr,
	&dev_attr_yoffset.attr,
	NULL,
};

static struct attribute_group bgrt_attribute_group = {
	.attrs = bgrt_attributes,
};

static int __init bgrt_init(void)
{
	int ret;

	if (!bgrt_image)
		return -ENODEV;

	sysfs_bin_attr_init(&image_attr);
	image_attr.private = bgrt_image;
	image_attr.size = bgrt_image_size;

	bgrt_kobj = kobject_create_and_add("bgrt", acpi_kobj);
	if (!bgrt_kobj)
		return -EINVAL;

	ret = sysfs_create_group(bgrt_kobj, &bgrt_attribute_group);
	if (ret)
		goto out_kobject;

	ret = sysfs_create_bin_file(bgrt_kobj, &image_attr);
	if (ret)
		goto out_group;

	return 0;

out_group:
	sysfs_remove_group(bgrt_kobj, &bgrt_attribute_group);
out_kobject:
	kobject_put(bgrt_kobj);
	return ret;
}

module_init(bgrt_init);

MODULE_AUTHOR("Matthew Garrett, Josh Triplett <[email protected]>");
MODULE_DESCRIPTION("BGRT boot graphic support");
MODULE_LICENSE("GPL");
Commit	Line	Data
d1ff4b1c MG	1	/*
d1ff4b1c MG	2	* Copyright 2012 Red Hat, Inc <[email protected]>
2223af38	3	* Copyright 2012 Intel Corporation
d1ff4b1c MG	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License version 2 as
	7	* published by the Free Software Foundation.
	8	*/
	9
	10	#include <linux/kernel.h>
	11	#include <linux/module.h>
	12	#include <linux/init.h>
	13	#include <linux/device.h>
	14	#include <linux/sysfs.h>
2223af38	15	#include <linux/efi-bgrt.h>
d1ff4b1c	16
d1ff4b1c MG	17	static struct kobject *bgrt_kobj;
d1ff4b1c MG	18
d1ff4b1c MG	19	static ssize_t show_version(struct device *dev,
	20	struct device_attribute attr, char buf)
	21	{
	22	return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->version);
	23	}
	24	static DEVICE_ATTR(version, S_IRUGO, show_version, NULL);
	25
	26	static ssize_t show_status(struct device *dev,
	27	struct device_attribute attr, char buf)
	28	{
	29	return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->status);
	30	}
	31	static DEVICE_ATTR(status, S_IRUGO, show_status, NULL);
	32
	33	static ssize_t show_type(struct device *dev,
	34	struct device_attribute attr, char buf)
	35	{
	36	return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_type);
	37	}
	38	static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
	39
	40	static ssize_t show_xoffset(struct device *dev,
	41	struct device_attribute attr, char buf)
	42	{
	43	return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_offset_x);
	44	}
	45	static DEVICE_ATTR(xoffset, S_IRUGO, show_xoffset, NULL);
	46
	47	static ssize_t show_yoffset(struct device *dev,
	48	struct device_attribute attr, char buf)
	49	{
	50	return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_offset_y);
	51	}
	52	static DEVICE_ATTR(yoffset, S_IRUGO, show_yoffset, NULL);
	53
	54	static ssize_t show_image(struct file file, struct kobject kobj,
	55	struct bin_attribute attr, char buf, loff_t off, size_t count)
	56	{
2223af38	57	memcpy(buf, attr->private + off, count);
d1ff4b1c MG	58	return count;
	59	}
	60
	61	static struct bin_attribute image_attr = {
	62	.attr = {
	63	.name = "image",
	64	.mode = S_IRUGO,
	65	},
	66	.read = show_image,
	67	};
	68
	69	static struct attribute *bgrt_attributes[] = {
	70	&dev_attr_version.attr,
	71	&dev_attr_status.attr,
	72	&dev_attr_type.attr,
	73	&dev_attr_xoffset.attr,
	74	&dev_attr_yoffset.attr,
	75	NULL,
	76	};
	77
	78	static struct attribute_group bgrt_attribute_group = {
	79	.attrs = bgrt_attributes,
	80	};
	81
	82	static int __init bgrt_init(void)
	83	{
d1ff4b1c	84	int ret;
d1ff4b1c	85
2223af38	86	if (!bgrt_image)
d1ff4b1c MG	87	return -ENODEV;
	88
	89	sysfs_bin_attr_init(&image_attr);
2223af38 JT	90	image_attr.private = bgrt_image;
2223af38 JT	91	image_attr.size = bgrt_image_size;
d1ff4b1c MG	92
d1ff4b1c MG	93	bgrt_kobj = kobject_create_and_add("bgrt", acpi_kobj);
2223af38 JT	94	if (!bgrt_kobj)
2223af38 JT	95	return -EINVAL;
d1ff4b1c MG	96
	97	ret = sysfs_create_group(bgrt_kobj, &bgrt_attribute_group);
	98	if (ret)
	99	goto out_kobject;
	100
	101	ret = sysfs_create_bin_file(bgrt_kobj, &image_attr);
	102	if (ret)
	103	goto out_group;
	104
	105	return 0;
	106
	107	out_group:
	108	sysfs_remove_group(bgrt_kobj, &bgrt_attribute_group);
	109	out_kobject:
	110	kobject_put(bgrt_kobj);
d1ff4b1c MG	111	return ret;
	112	}
	113
d1ff4b1c	114	module_init(bgrt_init);
d1ff4b1c	115
2223af38	116	MODULE_AUTHOR("Matthew Garrett, Josh Triplett <[email protected]>");
d1ff4b1c MG	117	MODULE_DESCRIPTION("BGRT boot graphic support");
d1ff4b1c MG	118	MODULE_LICENSE("GPL");