[deliverable/linux.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 <linux/module.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 const 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];
	umode_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>
cc4b859c	14	#include <linux/module.h>
1195a098 TR	15	#include "internal.h"
	16
	17	MODULE_AUTHOR("Thomas Renninger <trenn@suse.de>");
	18	MODULE_DESCRIPTION("ACPI EC sysfs access driver");
	19	MODULE_LICENSE("GPL");
	20
500de3dd TR	21	static bool write_support;
	22	module_param(write_support, bool, 0644);
	23	MODULE_PARM_DESC(write_support, "Dangerous, reboot and removal of battery may "
	24	"be needed.");
	25
9827886d TR	26	#define EC_SPACE_SIZE 256
9827886d TR	27
1195a098 TR	28	static struct dentry *acpi_ec_debugfs_dir;
1195a098 TR	29
9827886d TR	30	static int acpi_ec_open_io(struct inode i, struct file f)
	31	{
	32	f->private_data = i->i_private;
	33	return 0;
	34	}
	35
	36	static ssize_t acpi_ec_read_io(struct file f, char __user buf,
	37	size_t count, loff_t *off)
	38	{
	39	/* Use this if support reading/writing multiple ECs exists in ec.c:
	40	* struct acpi_ec ec = ((struct seq_file )f->private_data)->private;
	41	*/
	42	unsigned int size = EC_SPACE_SIZE;
	43	u8 data = (u8 ) buf;
	44	loff_t init_off = *off;
	45	int err = 0;
	46
	47	if (*off >= size)
	48	return 0;
	49	if (*off + count >= size) {
	50	size -= *off;
	51	count = size;
	52	} else
	53	size = count;
	54
	55	while (size) {
	56	err = ec_read(off, &data[off - init_off]);
	57	if (err)
	58	return err;
	59	*off += 1;
	60	size--;
	61	}
	62	return count;
	63	}
	64
	65	static ssize_t acpi_ec_write_io(struct file f, const char __user buf,
	66	size_t count, loff_t *off)
	67	{
	68	/* Use this if support reading/writing multiple ECs exists in ec.c:
	69	* struct acpi_ec ec = ((struct seq_file )f->private_data)->private;
	70	*/
	71
	72	unsigned int size = count;
	73	loff_t init_off = *off;
	74	u8 data = (u8 ) buf;
	75	int err = 0;
	76
	77	if (*off >= EC_SPACE_SIZE)
	78	return 0;
	79	if (*off + count >= EC_SPACE_SIZE) {
	80	size = EC_SPACE_SIZE - *off;
	81	count = size;
	82	}
	83
	84	while (size) {
	85	u8 byte_write = data[*off - init_off];
	86	err = ec_write(*off, byte_write);
	87	if (err)
	88	return err;
	89
	90	*off += 1;
	91	size--;
	92	}
	93	return count;
94	}
95
9c8b04be	96	static const struct file_operations acpi_ec_io_ops = {
9827886d TR	97	.owner = THIS_MODULE,
	98	.open = acpi_ec_open_io,
	99	.read = acpi_ec_read_io,
	100	.write = acpi_ec_write_io,
6038f373	101	.llseek = default_llseek,
9827886d TR	102	};
9827886d TR	103
1195a098 TR	104	int acpi_ec_add_debugfs(struct acpi_ec *ec, unsigned int ec_device_count)
	105	{
	106	struct dentry *dev_dir;
	107	char name[64];
f4ae40a6	108	umode_t mode = 0400;
500de3dd	109
1195a098 TR	110	if (ec_device_count == 0) {
	111	acpi_ec_debugfs_dir = debugfs_create_dir("ec", NULL);
	112	if (!acpi_ec_debugfs_dir)
	113	return -ENOMEM;
	114	}
	115
	116	sprintf(name, "ec%u", ec_device_count);
	117	dev_dir = debugfs_create_dir(name, acpi_ec_debugfs_dir);
	118	if (!dev_dir) {
500de3dd TR	119	if (ec_device_count != 0)
500de3dd TR	120	goto error;
1195a098 TR	121	return -ENOMEM;
	122	}
	123
500de3dd TR	124	if (!debugfs_create_x32("gpe", 0444, dev_dir, (u32 *)&first_ec->gpe))
	125	goto error;
	126	if (!debugfs_create_bool("use_global_lock", 0444, dev_dir,
	127	(u32 *)&first_ec->global_lock))
	128	goto error;
	129
	130	if (write_support)
	131	mode = 0600;
	132	if (!debugfs_create_file("io", mode, dev_dir, ec, &acpi_ec_io_ops))
	133	goto error;
	134
1195a098	135	return 0;
500de3dd TR	136
	137	error:
	138	debugfs_remove_recursive(acpi_ec_debugfs_dir);
	139	return -ENOMEM;
1195a098 TR	140	}
	141
	142	static int __init acpi_ec_sys_init(void)
	143	{
	144	int err = 0;
	145	if (first_ec)
	146	err = acpi_ec_add_debugfs(first_ec, 0);
	147	else
	148	err = -ENODEV;
	149	return err;
	150	}
	151
	152	static void __exit acpi_ec_sys_exit(void)
	153	{
	154	debugfs_remove_recursive(acpi_ec_debugfs_dir);
	155	}
	156
	157	module_init(acpi_ec_sys_init);
	158	module_exit(acpi_ec_sys_exit);