[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 <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 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  = simple_open,
	.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 ssize_t acpi_ec_read_io(struct file f, char __user buf,
	31	size_t count, loff_t *off)
	32	{
	33	/* Use this if support reading/writing multiple ECs exists in ec.c:
	34	* struct acpi_ec ec = ((struct seq_file )f->private_data)->private;
	35	*/
	36	unsigned int size = EC_SPACE_SIZE;
	37	u8 data = (u8 ) buf;
	38	loff_t init_off = *off;
	39	int err = 0;
	40
	41	if (*off >= size)
	42	return 0;
	43	if (*off + count >= size) {
	44	size -= *off;
	45	count = size;
	46	} else
	47	size = count;
	48
	49	while (size) {
	50	err = ec_read(off, &data[off - init_off]);
	51	if (err)
	52	return err;
	53	*off += 1;
	54	size--;
	55	}
	56	return count;
	57	}
	58
	59	static ssize_t acpi_ec_write_io(struct file f, const char __user buf,
	60	size_t count, loff_t *off)
	61	{
	62	/* Use this if support reading/writing multiple ECs exists in ec.c:
	63	* struct acpi_ec ec = ((struct seq_file )f->private_data)->private;
	64	*/
	65
	66	unsigned int size = count;
	67	loff_t init_off = *off;
	68	u8 data = (u8 ) buf;
	69	int err = 0;
	70
	71	if (*off >= EC_SPACE_SIZE)
	72	return 0;
	73	if (*off + count >= EC_SPACE_SIZE) {
	74	size = EC_SPACE_SIZE - *off;
	75	count = size;
	76	}
	77
	78	while (size) {
	79	u8 byte_write = data[*off - init_off];
	80	err = ec_write(*off, byte_write);
	81	if (err)
	82	return err;
	83
	84	*off += 1;
	85	size--;
	86	}
	87	return count;
	88	}
	89
9c8b04be	90	static const struct file_operations acpi_ec_io_ops = {
9827886d	91	.owner = THIS_MODULE,
234e3405	92	.open = simple_open,
9827886d TR	93	.read = acpi_ec_read_io,
9827886d TR	94	.write = acpi_ec_write_io,
6038f373	95	.llseek = default_llseek,
9827886d TR	96	};
9827886d TR	97
1195a098 TR	98	int acpi_ec_add_debugfs(struct acpi_ec *ec, unsigned int ec_device_count)
	99	{
	100	struct dentry *dev_dir;
	101	char name[64];
f4ae40a6	102	umode_t mode = 0400;
500de3dd	103
1195a098 TR	104	if (ec_device_count == 0) {
	105	acpi_ec_debugfs_dir = debugfs_create_dir("ec", NULL);
	106	if (!acpi_ec_debugfs_dir)
	107	return -ENOMEM;
	108	}
	109
	110	sprintf(name, "ec%u", ec_device_count);
	111	dev_dir = debugfs_create_dir(name, acpi_ec_debugfs_dir);
	112	if (!dev_dir) {
500de3dd TR	113	if (ec_device_count != 0)
500de3dd TR	114	goto error;
1195a098 TR	115	return -ENOMEM;
	116	}
	117
500de3dd TR	118	if (!debugfs_create_x32("gpe", 0444, dev_dir, (u32 *)&first_ec->gpe))
	119	goto error;
	120	if (!debugfs_create_bool("use_global_lock", 0444, dev_dir,
	121	(u32 *)&first_ec->global_lock))
	122	goto error;
	123
	124	if (write_support)
	125	mode = 0600;
	126	if (!debugfs_create_file("io", mode, dev_dir, ec, &acpi_ec_io_ops))
	127	goto error;
	128
1195a098	129	return 0;
500de3dd TR	130
	131	error:
	132	debugfs_remove_recursive(acpi_ec_debugfs_dir);
	133	return -ENOMEM;
1195a098 TR	134	}
	135
	136	static int __init acpi_ec_sys_init(void)
	137	{
	138	int err = 0;
	139	if (first_ec)
	140	err = acpi_ec_add_debugfs(first_ec, 0);
	141	else
	142	err = -ENODEV;
	143	return err;
	144	}
	145
	146	static void __exit acpi_ec_sys_exit(void)
	147	{
	148	debugfs_remove_recursive(acpi_ec_debugfs_dir);
	149	}
	150
	151	module_init(acpi_ec_sys_init);
	152	module_exit(acpi_ec_sys_exit);