[linux-2.6-block.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

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,
	.llseek = default_llseek,
};

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	static struct dentry *acpi_ec_debugfs_dir;
1195a098 TR	28
9827886d TR	29	static int acpi_ec_open_io(struct inode i, struct file f)
	30	{
	31	f->private_data = i->i_private;
	32	return 0;
	33	}
	34
	35	static ssize_t acpi_ec_read_io(struct file f, char __user buf,
	36	size_t count, loff_t *off)
	37	{
	38	/* Use this if support reading/writing multiple ECs exists in ec.c:
	39	* struct acpi_ec ec = ((struct seq_file )f->private_data)->private;
	40	*/
	41	unsigned int size = EC_SPACE_SIZE;
	42	u8 data = (u8 ) buf;
	43	loff_t init_off = *off;
	44	int err = 0;
	45
	46	if (*off >= size)
	47	return 0;
	48	if (*off + count >= size) {
	49	size -= *off;
	50	count = size;
	51	} else
	52	size = count;
	53
	54	while (size) {
	55	err = ec_read(off, &data[off - init_off]);
	56	if (err)
	57	return err;
	58	*off += 1;
	59	size--;
	60	}
	61	return count;
	62	}
	63
	64	static ssize_t acpi_ec_write_io(struct file f, const char __user buf,
	65	size_t count, loff_t *off)
	66	{
	67	/* Use this if support reading/writing multiple ECs exists in ec.c:
	68	* struct acpi_ec ec = ((struct seq_file )f->private_data)->private;
	69	*/
	70
	71	unsigned int size = count;
	72	loff_t init_off = *off;
	73	u8 data = (u8 ) buf;
	74	int err = 0;
	75
	76	if (*off >= EC_SPACE_SIZE)
	77	return 0;
	78	if (*off + count >= EC_SPACE_SIZE) {
	79	size = EC_SPACE_SIZE - *off;
	80	count = size;
	81	}
	82
	83	while (size) {
	84	u8 byte_write = data[*off - init_off];
	85	err = ec_write(*off, byte_write);
	86	if (err)
	87	return err;
	88
	89	*off += 1;
	90	size--;
	91	}
	92	return count;
93	}
94
95	static struct file_operations acpi_ec_io_ops = {
96	.owner = THIS_MODULE,
97	.open = acpi_ec_open_io,
98	.read = acpi_ec_read_io,
99	.write = acpi_ec_write_io,
6038f373	100	.llseek = default_llseek,
9827886d TR	101	};
9827886d TR	102
1195a098 TR	103	int acpi_ec_add_debugfs(struct acpi_ec *ec, unsigned int ec_device_count)
	104	{
	105	struct dentry *dev_dir;
	106	char name[64];
500de3dd TR	107	mode_t mode = 0400;
500de3dd TR	108
1195a098 TR	109	if (ec_device_count == 0) {
	110	acpi_ec_debugfs_dir = debugfs_create_dir("ec", NULL);
	111	if (!acpi_ec_debugfs_dir)
	112	return -ENOMEM;
	113	}
	114
	115	sprintf(name, "ec%u", ec_device_count);
	116	dev_dir = debugfs_create_dir(name, acpi_ec_debugfs_dir);
	117	if (!dev_dir) {
500de3dd TR	118	if (ec_device_count != 0)
500de3dd TR	119	goto error;
1195a098 TR	120	return -ENOMEM;
	121	}
	122
500de3dd TR	123	if (!debugfs_create_x32("gpe", 0444, dev_dir, (u32 *)&first_ec->gpe))
	124	goto error;
	125	if (!debugfs_create_bool("use_global_lock", 0444, dev_dir,
	126	(u32 *)&first_ec->global_lock))
	127	goto error;
	128
	129	if (write_support)
	130	mode = 0600;
	131	if (!debugfs_create_file("io", mode, dev_dir, ec, &acpi_ec_io_ops))
	132	goto error;
	133
1195a098	134	return 0;
500de3dd TR	135
	136	error:
	137	debugfs_remove_recursive(acpi_ec_debugfs_dir);
	138	return -ENOMEM;
1195a098 TR	139	}
	140
	141	static int __init acpi_ec_sys_init(void)
	142	{
	143	int err = 0;
	144	if (first_ec)
	145	err = acpi_ec_add_debugfs(first_ec, 0);
	146	else
	147	err = -ENODEV;
	148	return err;
	149	}
	150
	151	static void __exit acpi_ec_sys_exit(void)
	152	{
	153	debugfs_remove_recursive(acpi_ec_debugfs_dir);
	154	}
	155
	156	module_init(acpi_ec_sys_init);
	157	module_exit(acpi_ec_sys_exit);