[mirror_ubuntu-bionic-kernel.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");

#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];
	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)
			debugfs_remove_recursive(acpi_ec_debugfs_dir);
		/* TBD: Proper cleanup for multiple ECs */
		return -ENOMEM;
	}

	debugfs_create_x32("gpe", 0444, dev_dir, (u32 *)&first_ec->gpe);
	debugfs_create_bool("use_global_lock", 0444, dev_dir,
			    (u32 *)&first_ec->global_lock);
	debugfs_create_file("io", 0666, dev_dir, ec, &acpi_ec_io_ops);
	return 0;
}

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
9827886d TR	20	#define EC_SPACE_SIZE 256
9827886d TR	21
1195a098 TR	22	struct sysdev_class acpi_ec_sysdev_class = {
	23	.name = "ec",
	24	};
	25
	26	static struct dentry *acpi_ec_debugfs_dir;
	27
9827886d TR	28	static int acpi_ec_open_io(struct inode i, struct file f)
	29	{
	30	f->private_data = i->i_private;
	31	return 0;
	32	}
	33
	34	static ssize_t acpi_ec_read_io(struct file f, char __user buf,
	35	size_t count, loff_t *off)
	36	{
	37	/* Use this if support reading/writing multiple ECs exists in ec.c:
	38	* struct acpi_ec ec = ((struct seq_file )f->private_data)->private;
	39	*/
	40	unsigned int size = EC_SPACE_SIZE;
	41	u8 data = (u8 ) buf;
	42	loff_t init_off = *off;
	43	int err = 0;
	44
	45	if (*off >= size)
	46	return 0;
	47	if (*off + count >= size) {
	48	size -= *off;
	49	count = size;
	50	} else
	51	size = count;
	52
	53	while (size) {
	54	err = ec_read(off, &data[off - init_off]);
	55	if (err)
	56	return err;
	57	*off += 1;
	58	size--;
	59	}
	60	return count;
	61	}
	62
	63	static ssize_t acpi_ec_write_io(struct file f, const char __user buf,
	64	size_t count, loff_t *off)
	65	{
	66	/* Use this if support reading/writing multiple ECs exists in ec.c:
	67	* struct acpi_ec ec = ((struct seq_file )f->private_data)->private;
	68	*/
	69
	70	unsigned int size = count;
	71	loff_t init_off = *off;
	72	u8 data = (u8 ) buf;
	73	int err = 0;
	74
	75	if (*off >= EC_SPACE_SIZE)
	76	return 0;
	77	if (*off + count >= EC_SPACE_SIZE) {
	78	size = EC_SPACE_SIZE - *off;
	79	count = size;
	80	}
	81
	82	while (size) {
	83	u8 byte_write = data[*off - init_off];
	84	err = ec_write(*off, byte_write);
	85	if (err)
	86	return err;
	87
	88	*off += 1;
	89	size--;
	90	}
	91	return count;
92	}
93
94	static struct file_operations acpi_ec_io_ops = {
95	.owner = THIS_MODULE,
96	.open = acpi_ec_open_io,
97	.read = acpi_ec_read_io,
98	.write = acpi_ec_write_io,
99	};
100
1195a098 TR	101	int acpi_ec_add_debugfs(struct acpi_ec *ec, unsigned int ec_device_count)
	102	{
	103	struct dentry *dev_dir;
	104	char name[64];
	105	if (ec_device_count == 0) {
	106	acpi_ec_debugfs_dir = debugfs_create_dir("ec", NULL);
	107	if (!acpi_ec_debugfs_dir)
	108	return -ENOMEM;
	109	}
	110
	111	sprintf(name, "ec%u", ec_device_count);
	112	dev_dir = debugfs_create_dir(name, acpi_ec_debugfs_dir);
	113	if (!dev_dir) {
	114	if (ec_device_count == 0)
	115	debugfs_remove_recursive(acpi_ec_debugfs_dir);
	116	/* TBD: Proper cleanup for multiple ECs */
	117	return -ENOMEM;
	118	}
	119
	120	debugfs_create_x32("gpe", 0444, dev_dir, (u32 *)&first_ec->gpe);
	121	debugfs_create_bool("use_global_lock", 0444, dev_dir,
	122	(u32 *)&first_ec->global_lock);
9827886d	123	debugfs_create_file("io", 0666, dev_dir, ec, &acpi_ec_io_ops);
1195a098 TR	124	return 0;
	125	}
	126
	127	static int __init acpi_ec_sys_init(void)
	128	{
	129	int err = 0;
	130	if (first_ec)
	131	err = acpi_ec_add_debugfs(first_ec, 0);
	132	else
	133	err = -ENODEV;
	134	return err;
	135	}
	136
	137	static void __exit acpi_ec_sys_exit(void)
	138	{
	139	debugfs_remove_recursive(acpi_ec_debugfs_dir);
	140	}
	141
	142	module_init(acpi_ec_sys_init);
	143	module_exit(acpi_ec_sys_exit);