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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 | ||
500de3dd TR |
20 | static bool write_support; |
21 | module_param(write_support, bool, 0644); | |
22 | MODULE_PARM_DESC(write_support, "Dangerous, reboot and removal of battery may " | |
23 | "be needed."); | |
24 | ||
9827886d TR |
25 | #define EC_SPACE_SIZE 256 |
26 | ||
1195a098 TR |
27 | struct sysdev_class acpi_ec_sysdev_class = { |
28 | .name = "ec", | |
29 | }; | |
30 | ||
31 | static struct dentry *acpi_ec_debugfs_dir; | |
32 | ||
9827886d TR |
33 | static int acpi_ec_open_io(struct inode *i, struct file *f) |
34 | { | |
35 | f->private_data = i->i_private; | |
36 | return 0; | |
37 | } | |
38 | ||
39 | static ssize_t acpi_ec_read_io(struct file *f, char __user *buf, | |
40 | size_t count, loff_t *off) | |
41 | { | |
42 | /* Use this if support reading/writing multiple ECs exists in ec.c: | |
43 | * struct acpi_ec *ec = ((struct seq_file *)f->private_data)->private; | |
44 | */ | |
45 | unsigned int size = EC_SPACE_SIZE; | |
46 | u8 *data = (u8 *) buf; | |
47 | loff_t init_off = *off; | |
48 | int err = 0; | |
49 | ||
50 | if (*off >= size) | |
51 | return 0; | |
52 | if (*off + count >= size) { | |
53 | size -= *off; | |
54 | count = size; | |
55 | } else | |
56 | size = count; | |
57 | ||
58 | while (size) { | |
59 | err = ec_read(*off, &data[*off - init_off]); | |
60 | if (err) | |
61 | return err; | |
62 | *off += 1; | |
63 | size--; | |
64 | } | |
65 | return count; | |
66 | } | |
67 | ||
68 | static ssize_t acpi_ec_write_io(struct file *f, const char __user *buf, | |
69 | size_t count, loff_t *off) | |
70 | { | |
71 | /* Use this if support reading/writing multiple ECs exists in ec.c: | |
72 | * struct acpi_ec *ec = ((struct seq_file *)f->private_data)->private; | |
73 | */ | |
74 | ||
75 | unsigned int size = count; | |
76 | loff_t init_off = *off; | |
77 | u8 *data = (u8 *) buf; | |
78 | int err = 0; | |
79 | ||
80 | if (*off >= EC_SPACE_SIZE) | |
81 | return 0; | |
82 | if (*off + count >= EC_SPACE_SIZE) { | |
83 | size = EC_SPACE_SIZE - *off; | |
84 | count = size; | |
85 | } | |
86 | ||
87 | while (size) { | |
88 | u8 byte_write = data[*off - init_off]; | |
89 | err = ec_write(*off, byte_write); | |
90 | if (err) | |
91 | return err; | |
92 | ||
93 | *off += 1; | |
94 | size--; | |
95 | } | |
96 | return count; | |
97 | } | |
98 | ||
99 | static struct file_operations acpi_ec_io_ops = { | |
100 | .owner = THIS_MODULE, | |
101 | .open = acpi_ec_open_io, | |
102 | .read = acpi_ec_read_io, | |
103 | .write = acpi_ec_write_io, | |
6038f373 | 104 | .llseek = default_llseek, |
9827886d TR |
105 | }; |
106 | ||
1195a098 TR |
107 | int acpi_ec_add_debugfs(struct acpi_ec *ec, unsigned int ec_device_count) |
108 | { | |
109 | struct dentry *dev_dir; | |
110 | char name[64]; | |
500de3dd TR |
111 | mode_t mode = 0400; |
112 | ||
1195a098 TR |
113 | if (ec_device_count == 0) { |
114 | acpi_ec_debugfs_dir = debugfs_create_dir("ec", NULL); | |
115 | if (!acpi_ec_debugfs_dir) | |
116 | return -ENOMEM; | |
117 | } | |
118 | ||
119 | sprintf(name, "ec%u", ec_device_count); | |
120 | dev_dir = debugfs_create_dir(name, acpi_ec_debugfs_dir); | |
121 | if (!dev_dir) { | |
500de3dd TR |
122 | if (ec_device_count != 0) |
123 | goto error; | |
1195a098 TR |
124 | return -ENOMEM; |
125 | } | |
126 | ||
500de3dd TR |
127 | if (!debugfs_create_x32("gpe", 0444, dev_dir, (u32 *)&first_ec->gpe)) |
128 | goto error; | |
129 | if (!debugfs_create_bool("use_global_lock", 0444, dev_dir, | |
130 | (u32 *)&first_ec->global_lock)) | |
131 | goto error; | |
132 | ||
133 | if (write_support) | |
134 | mode = 0600; | |
135 | if (!debugfs_create_file("io", mode, dev_dir, ec, &acpi_ec_io_ops)) | |
136 | goto error; | |
137 | ||
1195a098 | 138 | return 0; |
500de3dd TR |
139 | |
140 | error: | |
141 | debugfs_remove_recursive(acpi_ec_debugfs_dir); | |
142 | return -ENOMEM; | |
1195a098 TR |
143 | } |
144 | ||
145 | static int __init acpi_ec_sys_init(void) | |
146 | { | |
147 | int err = 0; | |
148 | if (first_ec) | |
149 | err = acpi_ec_add_debugfs(first_ec, 0); | |
150 | else | |
151 | err = -ENODEV; | |
152 | return err; | |
153 | } | |
154 | ||
155 | static void __exit acpi_ec_sys_exit(void) | |
156 | { | |
157 | debugfs_remove_recursive(acpi_ec_debugfs_dir); | |
158 | } | |
159 | ||
160 | module_init(acpi_ec_sys_init); | |
161 | module_exit(acpi_ec_sys_exit); |