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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 | ||
18 | MODULE_AUTHOR("Thomas Renninger <trenn@suse.de>"); | |
19 | MODULE_DESCRIPTION("ACPI EC sysfs access driver"); | |
20 | MODULE_LICENSE("GPL"); | |
21 | ||
22 | static bool write_support; | |
23 | module_param(write_support, bool, 0644); | |
24 | MODULE_PARM_DESC(write_support, "Dangerous, reboot and removal of battery may " | |
25 | "be needed."); | |
26 | ||
27 | #define EC_SPACE_SIZE 256 | |
28 | ||
29 | static struct dentry *acpi_ec_debugfs_dir; | |
30 | ||
31 | static 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 | ||
65 | static 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 (*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; | |
85 | if (get_user(byte_write, buf + *off - init_off)) { | |
86 | if (*off - init_off) | |
87 | return *off - init_off; /* partial write */ | |
88 | return -EFAULT; | |
89 | } | |
90 | err = ec_write(*off, byte_write); | |
91 | if (err) | |
92 | return err; | |
93 | ||
94 | *off += 1; | |
95 | size--; | |
96 | } | |
97 | return count; | |
98 | } | |
99 | ||
100 | static const struct file_operations acpi_ec_io_ops = { | |
101 | .owner = THIS_MODULE, | |
102 | .open = simple_open, | |
103 | .read = acpi_ec_read_io, | |
104 | .write = acpi_ec_write_io, | |
105 | .llseek = default_llseek, | |
106 | }; | |
107 | ||
108 | static int acpi_ec_add_debugfs(struct acpi_ec *ec, unsigned int ec_device_count) | |
109 | { | |
110 | struct dentry *dev_dir; | |
111 | char name[64]; | |
112 | umode_t mode = 0400; | |
113 | ||
114 | if (ec_device_count == 0) { | |
115 | acpi_ec_debugfs_dir = debugfs_create_dir("ec", NULL); | |
116 | if (!acpi_ec_debugfs_dir) | |
117 | return -ENOMEM; | |
118 | } | |
119 | ||
120 | sprintf(name, "ec%u", ec_device_count); | |
121 | dev_dir = debugfs_create_dir(name, acpi_ec_debugfs_dir); | |
122 | if (!dev_dir) { | |
123 | if (ec_device_count != 0) | |
124 | goto error; | |
125 | return -ENOMEM; | |
126 | } | |
127 | ||
128 | if (!debugfs_create_x32("gpe", 0444, dev_dir, (u32 *)&first_ec->gpe)) | |
129 | goto error; | |
130 | if (!debugfs_create_bool("use_global_lock", 0444, dev_dir, | |
131 | (u32 *)&first_ec->global_lock)) | |
132 | goto error; | |
133 | ||
134 | if (write_support) | |
135 | mode = 0600; | |
136 | if (!debugfs_create_file("io", mode, dev_dir, ec, &acpi_ec_io_ops)) | |
137 | goto error; | |
138 | ||
139 | return 0; | |
140 | ||
141 | error: | |
142 | debugfs_remove_recursive(acpi_ec_debugfs_dir); | |
143 | return -ENOMEM; | |
144 | } | |
145 | ||
146 | static int __init acpi_ec_sys_init(void) | |
147 | { | |
148 | int err = 0; | |
149 | if (first_ec) | |
150 | err = acpi_ec_add_debugfs(first_ec, 0); | |
151 | else | |
152 | err = -ENODEV; | |
153 | return err; | |
154 | } | |
155 | ||
156 | static void __exit acpi_ec_sys_exit(void) | |
157 | { | |
158 | debugfs_remove_recursive(acpi_ec_debugfs_dir); | |
159 | } | |
160 | ||
161 | module_init(acpi_ec_sys_init); | |
162 | module_exit(acpi_ec_sys_exit); |