[net-next-2.6.git] / drivers / acpi / ec_sys.c

/*
 * ec_sys.c
 *
 * Copyright (C) 2010 SUSE Products GmbH/Novell
 * Author:
 *      Thomas Renninger <trenn@suse.de>
 *
 * This work is licensed under the terms of the GNU GPL, version 2.
 */

#include <linux/kernel.h>
#include <linux/acpi.h>
#include <linux/debugfs.h>
#include "internal.h"

MODULE_AUTHOR("Thomas Renninger <trenn@suse.de>");
MODULE_DESCRIPTION("ACPI EC sysfs access driver");
MODULE_LICENSE("GPL");

static bool write_support;
module_param(write_support, bool, 0644);
MODULE_PARM_DESC(write_support, "Dangerous, reboot and removal of battery may "
		 "be needed.");

#define EC_SPACE_SIZE 256

struct sysdev_class acpi_ec_sysdev_class = {
	.name = "ec",
};

static struct dentry *acpi_ec_debugfs_dir;

static int acpi_ec_open_io(struct inode *i, struct file *f)
{
	f->private_data = i->i_private;
	return 0;
}

static ssize_t acpi_ec_read_io(struct file *f, char __user *buf,
			       size_t count, loff_t *off)
{
	/* Use this if support reading/writing multiple ECs exists in ec.c:
	 * struct acpi_ec *ec = ((struct seq_file *)f->private_data)->private;
	 */
	unsigned int size = EC_SPACE_SIZE;
	u8 *data = (u8 *) buf;
	loff_t init_off = *off;
	int err = 0;

	if (*off >= size)
		return 0;
	if (*off + count >= size) {
		size -= *off;
		count = size;
	} else
		size = count;

	while (size) {
		err = ec_read(*off, &data[*off - init_off]);
		if (err)
			return err;
		*off += 1;
		size--;
	}
	return count;
}

static ssize_t acpi_ec_write_io(struct file *f, const char __user *buf,
				size_t count, loff_t *off)
{
	/* Use this if support reading/writing multiple ECs exists in ec.c:
	 * struct acpi_ec *ec = ((struct seq_file *)f->private_data)->private;
	 */

	unsigned int size = count;
	loff_t init_off = *off;
	u8 *data = (u8 *) buf;
	int err = 0;

	if (*off >= EC_SPACE_SIZE)
		return 0;
	if (*off + count >= EC_SPACE_SIZE) {
		size = EC_SPACE_SIZE - *off;
		count = size;
	}

	while (size) {
		u8 byte_write = data[*off - init_off];
		err = ec_write(*off, byte_write);
		if (err)
			return err;

		*off += 1;
		size--;
	}
	return count;
}

static struct file_operations acpi_ec_io_ops = {
	.owner = THIS_MODULE,
	.open  = acpi_ec_open_io,
	.read  = acpi_ec_read_io,
	.write = acpi_ec_write_io,
};

int acpi_ec_add_debugfs(struct acpi_ec *ec, unsigned int ec_device_count)
{
	struct dentry *dev_dir;
	char name[64];
	mode_t mode = 0400;

	if (ec_device_count == 0) {
		acpi_ec_debugfs_dir = debugfs_create_dir("ec", NULL);
		if (!acpi_ec_debugfs_dir)
			return -ENOMEM;
	}

	sprintf(name, "ec%u", ec_device_count);
	dev_dir = debugfs_create_dir(name, acpi_ec_debugfs_dir);
	if (!dev_dir) {
		if (ec_device_count != 0)
			goto error;
		return -ENOMEM;
	}

	if (!debugfs_create_x32("gpe", 0444, dev_dir, (u32 *)&first_ec->gpe))
		goto error;
	if (!debugfs_create_bool("use_global_lock", 0444, dev_dir,
				 (u32 *)&first_ec->global_lock))
		goto error;

	if (write_support)
		mode = 0600;
	if (!debugfs_create_file("io", mode, dev_dir, ec, &acpi_ec_io_ops))
		goto error;

	return 0;

error:
	debugfs_remove_recursive(acpi_ec_debugfs_dir);
	return -ENOMEM;
}

static int __init acpi_ec_sys_init(void)
{
	int err = 0;
	if (first_ec)
		err = acpi_ec_add_debugfs(first_ec, 0);
	else
		err = -ENODEV;
	return err;
}

static void __exit acpi_ec_sys_exit(void)
{
	debugfs_remove_recursive(acpi_ec_debugfs_dir);
}

module_init(acpi_ec_sys_init);
module_exit(acpi_ec_sys_exit);
Commit	Line	Data
9827886d TR	1	/*
	2	* ec_sys.c
	3	*
	4	* Copyright (C) 2010 SUSE Products GmbH/Novell
	5	* Author:
	6	* Thomas Renninger <trenn@suse.de>
	7	*
	8	* This work is licensed under the terms of the GNU GPL, version 2.
	9	*/
	10
1195a098 TR	11	#include <linux/kernel.h>
	12	#include <linux/acpi.h>
	13	#include <linux/debugfs.h>
	14	#include "internal.h"
	15
	16	MODULE_AUTHOR("Thomas Renninger <trenn@suse.de>");
	17	MODULE_DESCRIPTION("ACPI EC sysfs access driver");
	18	MODULE_LICENSE("GPL");
	19
500de3dd TR	20	static bool write_support;
	21	module_param(write_support, bool, 0644);
	22	MODULE_PARM_DESC(write_support, "Dangerous, reboot and removal of battery may "
	23	"be needed.");
	24
9827886d TR	25	#define EC_SPACE_SIZE 256
9827886d TR	26
1195a098 TR	27	struct sysdev_class acpi_ec_sysdev_class = {
	28	.name = "ec",
	29	};
	30
	31	static struct dentry *acpi_ec_debugfs_dir;
	32
9827886d TR	33	static int acpi_ec_open_io(struct inode i, struct file f)
	34	{
	35	f->private_data = i->i_private;
	36	return 0;
	37	}
	38
	39	static ssize_t acpi_ec_read_io(struct file f, char __user buf,
	40	size_t count, loff_t *off)
	41	{
	42	/* Use this if support reading/writing multiple ECs exists in ec.c:
	43	* struct acpi_ec ec = ((struct seq_file )f->private_data)->private;
	44	*/
	45	unsigned int size = EC_SPACE_SIZE;
	46	u8 data = (u8 ) buf;
	47	loff_t init_off = *off;
	48	int err = 0;
	49
	50	if (*off >= size)
	51	return 0;
	52	if (*off + count >= size) {
	53	size -= *off;
	54	count = size;
	55	} else
	56	size = count;
	57
	58	while (size) {
	59	err = ec_read(off, &data[off - init_off]);
	60	if (err)
	61	return err;
	62	*off += 1;
	63	size--;
	64	}
	65	return count;
	66	}
	67
	68	static ssize_t acpi_ec_write_io(struct file f, const char __user buf,
	69	size_t count, loff_t *off)
	70	{
	71	/* Use this if support reading/writing multiple ECs exists in ec.c:
	72	* struct acpi_ec ec = ((struct seq_file )f->private_data)->private;
	73	*/
	74
	75	unsigned int size = count;
	76	loff_t init_off = *off;
	77	u8 data = (u8 ) buf;
	78	int err = 0;
	79
	80	if (*off >= EC_SPACE_SIZE)
	81	return 0;
	82	if (*off + count >= EC_SPACE_SIZE) {
	83	size = EC_SPACE_SIZE - *off;
	84	count = size;
	85	}
	86
	87	while (size) {
	88	u8 byte_write = data[*off - init_off];
	89	err = ec_write(*off, byte_write);
	90	if (err)
	91	return err;
	92
	93	*off += 1;
	94	size--;
	95	}
	96	return count;
97	}
98
99	static struct file_operations acpi_ec_io_ops = {
100	.owner = THIS_MODULE,
101	.open = acpi_ec_open_io,
102	.read = acpi_ec_read_io,
103	.write = acpi_ec_write_io,
104	};
105
1195a098 TR	106	int acpi_ec_add_debugfs(struct acpi_ec *ec, unsigned int ec_device_count)
	107	{
	108	struct dentry *dev_dir;
	109	char name[64];
500de3dd TR	110	mode_t mode = 0400;
500de3dd TR	111
1195a098 TR	112	if (ec_device_count == 0) {
	113	acpi_ec_debugfs_dir = debugfs_create_dir("ec", NULL);
	114	if (!acpi_ec_debugfs_dir)
	115	return -ENOMEM;
	116	}
	117
	118	sprintf(name, "ec%u", ec_device_count);
	119	dev_dir = debugfs_create_dir(name, acpi_ec_debugfs_dir);
	120	if (!dev_dir) {
500de3dd TR	121	if (ec_device_count != 0)
500de3dd TR	122	goto error;
1195a098 TR	123	return -ENOMEM;
	124	}
	125
500de3dd TR	126	if (!debugfs_create_x32("gpe", 0444, dev_dir, (u32 *)&first_ec->gpe))
	127	goto error;
	128	if (!debugfs_create_bool("use_global_lock", 0444, dev_dir,
	129	(u32 *)&first_ec->global_lock))
	130	goto error;
	131
	132	if (write_support)
	133	mode = 0600;
	134	if (!debugfs_create_file("io", mode, dev_dir, ec, &acpi_ec_io_ops))
	135	goto error;
	136
1195a098	137	return 0;
500de3dd TR	138
	139	error:
	140	debugfs_remove_recursive(acpi_ec_debugfs_dir);
	141	return -ENOMEM;
1195a098 TR	142	}
	143
	144	static int __init acpi_ec_sys_init(void)
	145	{
	146	int err = 0;
	147	if (first_ec)
	148	err = acpi_ec_add_debugfs(first_ec, 0);
	149	else
	150	err = -ENODEV;
	151	return err;
	152	}
	153
	154	static void __exit acpi_ec_sys_exit(void)
	155	{
	156	debugfs_remove_recursive(acpi_ec_debugfs_dir);
	157	}
	158
	159	module_init(acpi_ec_sys_init);
	160	module_exit(acpi_ec_sys_exit);