ACPI: replace kmalloc+memset with kzalloc
[linux-2.6.git] / drivers / acpi / fan.c
1 /*
2  *  acpi_fan.c - ACPI Fan Driver ($Revision: 29 $)
3  *
4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6  *
7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8  *
9  *  This program is free software; you can redistribute it and/or modify
10  *  it under the terms of the GNU General Public License as published by
11  *  the Free Software Foundation; either version 2 of the License, or (at
12  *  your option) any later version.
13  *
14  *  This program is distributed in the hope that it will be useful, but
15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17  *  General Public License for more details.
18  *
19  *  You should have received a copy of the GNU General Public License along
20  *  with this program; if not, write to the Free Software Foundation, Inc.,
21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22  *
23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24  */
25
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/init.h>
29 #include <linux/types.h>
30 #include <linux/proc_fs.h>
31 #include <linux/seq_file.h>
32 #include <asm/uaccess.h>
33
34 #include <acpi/acpi_bus.h>
35 #include <acpi/acpi_drivers.h>
36
37 #define ACPI_FAN_COMPONENT              0x00200000
38 #define ACPI_FAN_CLASS                  "fan"
39 #define ACPI_FAN_DRIVER_NAME            "ACPI Fan Driver"
40 #define ACPI_FAN_FILE_STATE             "state"
41
42 #define _COMPONENT              ACPI_FAN_COMPONENT
43 ACPI_MODULE_NAME("acpi_fan")
44
45     MODULE_AUTHOR("Paul Diefenbaugh");
46 MODULE_DESCRIPTION(ACPI_FAN_DRIVER_NAME);
47 MODULE_LICENSE("GPL");
48
49 static int acpi_fan_add(struct acpi_device *device);
50 static int acpi_fan_remove(struct acpi_device *device, int type);
51 static int acpi_fan_suspend(struct acpi_device *device, int state);
52 static int acpi_fan_resume(struct acpi_device *device, int state);
53
54 static struct acpi_driver acpi_fan_driver = {
55         .name = ACPI_FAN_DRIVER_NAME,
56         .class = ACPI_FAN_CLASS,
57         .ids = "PNP0C0B",
58         .ops = {
59                 .add = acpi_fan_add,
60                 .remove = acpi_fan_remove,
61                 .suspend = acpi_fan_suspend,
62                 .resume = acpi_fan_resume,
63                 },
64 };
65
66 struct acpi_fan {
67         struct acpi_device * device;
68 };
69
70 /* --------------------------------------------------------------------------
71                               FS Interface (/proc)
72    -------------------------------------------------------------------------- */
73
74 static struct proc_dir_entry *acpi_fan_dir;
75
76 static int acpi_fan_read_state(struct seq_file *seq, void *offset)
77 {
78         struct acpi_fan *fan = seq->private;
79         int state = 0;
80
81
82         if (fan) {
83                 if (acpi_bus_get_power(fan->device->handle, &state))
84                         seq_printf(seq, "status:                  ERROR\n");
85                 else
86                         seq_printf(seq, "status:                  %s\n",
87                                    !state ? "on" : "off");
88         }
89         return 0;
90 }
91
92 static int acpi_fan_state_open_fs(struct inode *inode, struct file *file)
93 {
94         return single_open(file, acpi_fan_read_state, PDE(inode)->data);
95 }
96
97 static ssize_t
98 acpi_fan_write_state(struct file *file, const char __user * buffer,
99                      size_t count, loff_t * ppos)
100 {
101         int result = 0;
102         struct seq_file *m = file->private_data;
103         struct acpi_fan *fan = m->private;
104         char state_string[12] = { '\0' };
105
106
107         if (!fan || (count > sizeof(state_string) - 1))
108                 return -EINVAL;
109
110         if (copy_from_user(state_string, buffer, count))
111                 return -EFAULT;
112
113         state_string[count] = '\0';
114
115         result = acpi_bus_set_power(fan->device->handle,
116                                     simple_strtoul(state_string, NULL, 0));
117         if (result)
118                 return result;
119
120         return count;
121 }
122
123 static const struct file_operations acpi_fan_state_ops = {
124         .open = acpi_fan_state_open_fs,
125         .read = seq_read,
126         .write = acpi_fan_write_state,
127         .llseek = seq_lseek,
128         .release = single_release,
129         .owner = THIS_MODULE,
130 };
131
132 static int acpi_fan_add_fs(struct acpi_device *device)
133 {
134         struct proc_dir_entry *entry = NULL;
135
136
137         if (!device)
138                 return -EINVAL;
139
140         if (!acpi_device_dir(device)) {
141                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
142                                                      acpi_fan_dir);
143                 if (!acpi_device_dir(device))
144                         return -ENODEV;
145                 acpi_device_dir(device)->owner = THIS_MODULE;
146         }
147
148         /* 'status' [R/W] */
149         entry = create_proc_entry(ACPI_FAN_FILE_STATE,
150                                   S_IFREG | S_IRUGO | S_IWUSR,
151                                   acpi_device_dir(device));
152         if (!entry)
153                 return -ENODEV;
154         else {
155                 entry->proc_fops = &acpi_fan_state_ops;
156                 entry->data = acpi_driver_data(device);
157                 entry->owner = THIS_MODULE;
158         }
159
160         return 0;
161 }
162
163 static int acpi_fan_remove_fs(struct acpi_device *device)
164 {
165
166         if (acpi_device_dir(device)) {
167                 remove_proc_entry(ACPI_FAN_FILE_STATE, acpi_device_dir(device));
168                 remove_proc_entry(acpi_device_bid(device), acpi_fan_dir);
169                 acpi_device_dir(device) = NULL;
170         }
171
172         return 0;
173 }
174
175 /* --------------------------------------------------------------------------
176                                  Driver Interface
177    -------------------------------------------------------------------------- */
178
179 static int acpi_fan_add(struct acpi_device *device)
180 {
181         int result = 0;
182         struct acpi_fan *fan = NULL;
183         int state = 0;
184
185
186         if (!device)
187                 return -EINVAL;
188
189         fan = kzalloc(sizeof(struct acpi_fan), GFP_KERNEL);
190         if (!fan)
191                 return -ENOMEM;
192
193         fan->device = device;
194         strcpy(acpi_device_name(device), "Fan");
195         strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
196         acpi_driver_data(device) = fan;
197
198         result = acpi_bus_get_power(device->handle, &state);
199         if (result) {
200                 printk(KERN_ERR PREFIX "Reading power state\n");
201                 goto end;
202         }
203
204         device->flags.force_power_state = 1;
205         acpi_bus_set_power(device->handle, state);
206         device->flags.force_power_state = 0;
207
208         result = acpi_fan_add_fs(device);
209         if (result)
210                 goto end;
211
212         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
213                acpi_device_name(device), acpi_device_bid(device),
214                !device->power.state ? "on" : "off");
215
216       end:
217         if (result)
218                 kfree(fan);
219
220         return result;
221 }
222
223 static int acpi_fan_remove(struct acpi_device *device, int type)
224 {
225         struct acpi_fan *fan = NULL;
226
227
228         if (!device || !acpi_driver_data(device))
229                 return -EINVAL;
230
231         fan = acpi_driver_data(device);
232
233         acpi_fan_remove_fs(device);
234
235         kfree(fan);
236
237         return 0;
238 }
239
240 static int acpi_fan_suspend(struct acpi_device *device, int state)
241 {
242         if (!device)
243                 return -EINVAL;
244
245         acpi_bus_set_power(device->handle, ACPI_STATE_D0);
246
247         return AE_OK;
248 }
249
250 static int acpi_fan_resume(struct acpi_device *device, int state)
251 {
252         int result = 0;
253         int power_state = 0;
254
255         if (!device)
256                 return -EINVAL;
257
258         result = acpi_bus_get_power(device->handle, &power_state);
259         if (result) {
260                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
261                                   "Error reading fan power state\n"));
262                 return result;
263         }
264
265         device->flags.force_power_state = 1;
266         acpi_bus_set_power(device->handle, power_state);
267         device->flags.force_power_state = 0;
268
269         return result;
270 }
271
272 static int __init acpi_fan_init(void)
273 {
274         int result = 0;
275
276
277         acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
278         if (!acpi_fan_dir)
279                 return -ENODEV;
280         acpi_fan_dir->owner = THIS_MODULE;
281
282         result = acpi_bus_register_driver(&acpi_fan_driver);
283         if (result < 0) {
284                 remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
285                 return -ENODEV;
286         }
287
288         return 0;
289 }
290
291 static void __exit acpi_fan_exit(void)
292 {
293
294         acpi_bus_unregister_driver(&acpi_fan_driver);
295
296         remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
297
298         return;
299 }
300
301 module_init(acpi_fan_init);
302 module_exit(acpi_fan_exit);