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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);
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 <linux/module.h>
15#include <linux/uaccess.h>
16#include "internal.h"
17
18MODULE_AUTHOR("Thomas Renninger <trenn@suse.de>");
19MODULE_DESCRIPTION("ACPI EC sysfs access driver");
20MODULE_LICENSE("GPL");
21
22static bool write_support;
23module_param(write_support, bool, 0644);
24MODULE_PARM_DESC(write_support, "Dangerous, reboot and removal of battery may "
25 "be needed.");
26
27#define EC_SPACE_SIZE 256
28
29static struct dentry *acpi_ec_debugfs_dir;
30
31static ssize_t acpi_ec_read_io(struct file *f, char __user *buf,
32 size_t count, loff_t *off)
33{
34 /* Use this if support reading/writing multiple ECs exists in ec.c:
35 * struct acpi_ec *ec = ((struct seq_file *)f->private_data)->private;
36 */
37 unsigned int size = EC_SPACE_SIZE;
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 u8 byte_read;
51 err = ec_read(*off, &byte_read);
52 if (err)
53 return err;
54 if (put_user(byte_read, buf + *off - init_off)) {
55 if (*off - init_off)
56 return *off - init_off; /* partial read */
57 return -EFAULT;
58 }
59 *off += 1;
60 size--;
61 }
62 return count;
63}
64
65static 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 int err = 0;
75
76 if (!write_support)
77 return -EINVAL;
78
79 if (*off >= EC_SPACE_SIZE)
80 return 0;
81 if (*off + count >= EC_SPACE_SIZE) {
82 size = EC_SPACE_SIZE - *off;
83 count = size;
84 }
85
86 while (size) {
87 u8 byte_write;
88 if (get_user(byte_write, buf + *off - init_off)) {
89 if (*off - init_off)
90 return *off - init_off; /* partial write */
91 return -EFAULT;
92 }
93 err = ec_write(*off, byte_write);
94 if (err)
95 return err;
96
97 *off += 1;
98 size--;
99 }
100 return count;
101}
102
103static const struct file_operations acpi_ec_io_ops = {
104 .owner = THIS_MODULE,
105 .open = simple_open,
106 .read = acpi_ec_read_io,
107 .write = acpi_ec_write_io,
108 .llseek = default_llseek,
109};
110
111static int acpi_ec_add_debugfs(struct acpi_ec *ec, unsigned int ec_device_count)
112{
113 struct dentry *dev_dir;
114 char name[64];
115 umode_t mode = 0400;
116
117 if (ec_device_count == 0) {
118 acpi_ec_debugfs_dir = debugfs_create_dir("ec", NULL);
119 if (!acpi_ec_debugfs_dir)
120 return -ENOMEM;
121 }
122
123 sprintf(name, "ec%u", ec_device_count);
124 dev_dir = debugfs_create_dir(name, acpi_ec_debugfs_dir);
125 if (!dev_dir) {
126 if (ec_device_count != 0)
127 goto error;
128 return -ENOMEM;
129 }
130
131 if (!debugfs_create_x32("gpe", 0444, dev_dir, (u32 *)&first_ec->gpe))
132 goto error;
133 if (!debugfs_create_bool("use_global_lock", 0444, dev_dir,
134 &first_ec->global_lock))
135 goto error;
136
137 if (write_support)
138 mode = 0600;
139 if (!debugfs_create_file("io", mode, dev_dir, ec, &acpi_ec_io_ops))
140 goto error;
141
142 return 0;
143
144error:
145 debugfs_remove_recursive(acpi_ec_debugfs_dir);
146 return -ENOMEM;
147}
148
149static int __init acpi_ec_sys_init(void)
150{
151 int err = 0;
152 if (first_ec)
153 err = acpi_ec_add_debugfs(first_ec, 0);
154 else
155 err = -ENODEV;
156 return err;
157}
158
159static void __exit acpi_ec_sys_exit(void)
160{
161 debugfs_remove_recursive(acpi_ec_debugfs_dir);
162}
163
164module_init(acpi_ec_sys_init);
165module_exit(acpi_ec_sys_exit);