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
 11#include <linux/kernel.h>
 12#include <linux/acpi.h>
 13#include <linux/debugfs.h>
 
 
 14#include "internal.h"
 15
 16MODULE_AUTHOR("Thomas Renninger <trenn@suse.de>");
 17MODULE_DESCRIPTION("ACPI EC sysfs access driver");
 18MODULE_LICENSE("GPL");
 19
 20static bool write_support;
 21module_param(write_support, bool, 0644);
 22MODULE_PARM_DESC(write_support, "Dangerous, reboot and removal of battery may "
 23		 "be needed.");
 24
 25#define EC_SPACE_SIZE 256
 26
 27static struct dentry *acpi_ec_debugfs_dir;
 28
 29static int acpi_ec_open_io(struct inode *i, struct file *f)
 30{
 31	f->private_data = i->i_private;
 32	return 0;
 33}
 34
 35static 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
 64static 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
 95static const 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,
100	.llseek = default_llseek,
101};
102
103int acpi_ec_add_debugfs(struct acpi_ec *ec, unsigned int ec_device_count)
104{
105	struct dentry *dev_dir;
106	char name[64];
107	mode_t mode = 0400;
108
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) {
118		if (ec_device_count != 0)
119			goto error;
120		return -ENOMEM;
121	}
122
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
134	return 0;
135
136error:
137	debugfs_remove_recursive(acpi_ec_debugfs_dir);
138	return -ENOMEM;
139}
140
141static 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
151static void __exit acpi_ec_sys_exit(void)
152{
153	debugfs_remove_recursive(acpi_ec_debugfs_dir);
154}
155
156module_init(acpi_ec_sys_init);
157module_exit(acpi_ec_sys_exit);

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * ec_sys.c
  4 *
  5 * Copyright (C) 2010 SUSE Products GmbH/Novell
  6 * Author:
  7 *      Thomas Renninger <trenn@suse.de>
 
 
  8 */
  9
 10#include <linux/kernel.h>
 11#include <linux/acpi.h>
 12#include <linux/debugfs.h>
 13#include <linux/module.h>
 14#include <linux/uaccess.h>
 15#include "internal.h"
 16
 17MODULE_AUTHOR("Thomas Renninger <trenn@suse.de>");
 18MODULE_DESCRIPTION("ACPI EC sysfs access driver");
 19MODULE_LICENSE("GPL");
 20
 21static bool write_support;
 22module_param_hw(write_support, bool, other, 0644);
 23MODULE_PARM_DESC(write_support, "Dangerous, reboot and removal of battery may "
 24		 "be needed.");
 25
 26#define EC_SPACE_SIZE 256
 27
 28static struct dentry *acpi_ec_debugfs_dir;
 29
 
 
 
 
 
 
 30static 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	loff_t init_off = *off;
 38	int err = 0;
 39
 40	if (*off >= size)
 41		return 0;
 42	if (*off + count >= size) {
 43		size -= *off;
 44		count = size;
 45	} else
 46		size = count;
 47
 48	while (size) {
 49		u8 byte_read;
 50		err = ec_read(*off, &byte_read);
 51		if (err)
 52			return err;
 53		if (put_user(byte_read, buf + *off - init_off)) {
 54			if (*off - init_off)
 55				return *off - init_off; /* partial read */
 56			return -EFAULT;
 57		}
 58		*off += 1;
 59		size--;
 60	}
 61	return count;
 62}
 63
 64static 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	int err = 0;
 74
 75	if (!write_support)
 76		return -EINVAL;
 77
 78	if (*off >= EC_SPACE_SIZE)
 79		return 0;
 80	if (*off + count >= EC_SPACE_SIZE) {
 81		size = EC_SPACE_SIZE - *off;
 82		count = size;
 83	}
 84
 85	while (size) {
 86		u8 byte_write;
 87		if (get_user(byte_write, buf + *off - init_off)) {
 88			if (*off - init_off)
 89				return *off - init_off; /* partial write */
 90			return -EFAULT;
 91		}
 92		err = ec_write(*off, byte_write);
 93		if (err)
 94			return err;
 95
 96		*off += 1;
 97		size--;
 98	}
 99	return count;
100}
101
102static const struct file_operations acpi_ec_io_ops = {
103	.owner = THIS_MODULE,
104	.open  = simple_open,
105	.read  = acpi_ec_read_io,
106	.write = acpi_ec_write_io,
107	.llseek = default_llseek,
108};
109
110static void acpi_ec_add_debugfs(struct acpi_ec *ec, unsigned int ec_device_count)
111{
112	struct dentry *dev_dir;
113	char name[64];
114	umode_t mode = 0400;
115
116	if (ec_device_count == 0)
117		acpi_ec_debugfs_dir = debugfs_create_dir("ec", NULL);
 
 
 
118
119	sprintf(name, "ec%u", ec_device_count);
120	dev_dir = debugfs_create_dir(name, acpi_ec_debugfs_dir);
 
 
 
 
 
121
122	debugfs_create_x32("gpe", 0444, dev_dir, &first_ec->gpe);
123	debugfs_create_bool("use_global_lock", 0444, dev_dir,
124			    &first_ec->global_lock);
 
 
125
126	if (write_support)
127		mode = 0600;
128	debugfs_create_file("io", mode, dev_dir, ec, &acpi_ec_io_ops);
 
 
 
 
 
 
 
129}
130
131static int __init acpi_ec_sys_init(void)
132{
 
133	if (first_ec)
134		acpi_ec_add_debugfs(first_ec, 0);
135	return 0;
 
 
136}
137
138static void __exit acpi_ec_sys_exit(void)
139{
140	debugfs_remove_recursive(acpi_ec_debugfs_dir);
141}
142
143module_init(acpi_ec_sys_init);
144module_exit(acpi_ec_sys_exit);