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7a338472 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
9827886d TR |
2 | /* |
3 | * ec_sys.c | |
4 | * | |
5 | * Copyright (C) 2010 SUSE Products GmbH/Novell | |
6 | * Author: | |
7 | * Thomas Renninger <trenn@suse.de> | |
9827886d TR |
8 | */ |
9 | ||
1195a098 TR |
10 | #include <linux/kernel.h> |
11 | #include <linux/acpi.h> | |
12 | #include <linux/debugfs.h> | |
cc4b859c | 13 | #include <linux/module.h> |
ecde3003 | 14 | #include <linux/uaccess.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 | 21 | static bool write_support; |
b66f8684 | 22 | module_param_hw(write_support, bool, other, 0644); |
500de3dd TR |
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 |
27 | ||
1195a098 TR |
28 | static struct dentry *acpi_ec_debugfs_dir; |
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; | |
9827886d TR |
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) { | |
ecde3003 VK |
49 | u8 byte_read; |
50 | err = ec_read(*off, &byte_read); | |
9827886d TR |
51 | if (err) |
52 | return err; | |
ecde3003 VK |
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 | } | |
9827886d TR |
58 | *off += 1; |
59 | size--; | |
60 | } | |
61 | return count; | |
62 | } | |
63 | ||
64 | static 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; | |
9827886d TR |
73 | int err = 0; |
74 | ||
1b6e75ee OD |
75 | if (!write_support) |
76 | return -EINVAL; | |
77 | ||
9827886d TR |
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) { | |
ecde3003 VK |
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 | } | |
9827886d TR |
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 | ||
9c8b04be | 102 | static const struct file_operations acpi_ec_io_ops = { |
9827886d | 103 | .owner = THIS_MODULE, |
234e3405 | 104 | .open = simple_open, |
9827886d TR |
105 | .read = acpi_ec_read_io, |
106 | .write = acpi_ec_write_io, | |
6038f373 | 107 | .llseek = default_llseek, |
9827886d TR |
108 | }; |
109 | ||
9ec6dbfb | 110 | static void acpi_ec_add_debugfs(struct acpi_ec *ec, unsigned int ec_device_count) |
1195a098 TR |
111 | { |
112 | struct dentry *dev_dir; | |
113 | char name[64]; | |
f4ae40a6 | 114 | umode_t mode = 0400; |
500de3dd | 115 | |
9ec6dbfb | 116 | if (ec_device_count == 0) |
1195a098 | 117 | acpi_ec_debugfs_dir = debugfs_create_dir("ec", NULL); |
1195a098 TR |
118 | |
119 | sprintf(name, "ec%u", ec_device_count); | |
120 | dev_dir = debugfs_create_dir(name, acpi_ec_debugfs_dir); | |
1195a098 | 121 | |
9ec6dbfb GKH |
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); | |
500de3dd TR |
125 | |
126 | if (write_support) | |
127 | mode = 0600; | |
9ec6dbfb | 128 | debugfs_create_file("io", mode, dev_dir, ec, &acpi_ec_io_ops); |
1195a098 TR |
129 | } |
130 | ||
131 | static int __init acpi_ec_sys_init(void) | |
132 | { | |
1195a098 | 133 | if (first_ec) |
9ec6dbfb GKH |
134 | acpi_ec_add_debugfs(first_ec, 0); |
135 | return 0; | |
1195a098 TR |
136 | } |
137 | ||
138 | static void __exit acpi_ec_sys_exit(void) | |
139 | { | |
140 | debugfs_remove_recursive(acpi_ec_debugfs_dir); | |
141 | } | |
142 | ||
143 | module_init(acpi_ec_sys_init); | |
144 | module_exit(acpi_ec_sys_exit); |