media: tegra: add supporting for RAW8/RAW10 input and output
[linux-2.6.git] / drivers / rtc / alarm-dev.c
1 /* drivers/rtc/alarm-dev.c
2  *
3  * Copyright (C) 2007-2009 Google, Inc.
4  *
5  * This software is licensed under the terms of the GNU General Public
6  * License version 2, as published by the Free Software Foundation, and
7  * may be copied, distributed, and modified under those terms.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  */
15
16 #include <asm/mach/time.h>
17 #include <linux/android_alarm.h>
18 #include <linux/device.h>
19 #include <linux/miscdevice.h>
20 #include <linux/fs.h>
21 #include <linux/platform_device.h>
22 #include <linux/sched.h>
23 #include <linux/spinlock.h>
24 #include <linux/sysdev.h>
25 #include <linux/uaccess.h>
26 #include <linux/wakelock.h>
27
28 #define ANDROID_ALARM_PRINT_INFO (1U << 0)
29 #define ANDROID_ALARM_PRINT_IO (1U << 1)
30 #define ANDROID_ALARM_PRINT_INT (1U << 2)
31
32 static int debug_mask = ANDROID_ALARM_PRINT_INFO;
33 module_param_named(debug_mask, debug_mask, int, S_IRUGO | S_IWUSR | S_IWGRP);
34
35 #define pr_alarm(debug_level_mask, args...) \
36         do { \
37                 if (debug_mask & ANDROID_ALARM_PRINT_##debug_level_mask) { \
38                         pr_info(args); \
39                 } \
40         } while (0)
41
42 #define ANDROID_ALARM_WAKEUP_MASK ( \
43         ANDROID_ALARM_RTC_WAKEUP_MASK | \
44         ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP_MASK)
45
46 /* support old usespace code */
47 #define ANDROID_ALARM_SET_OLD               _IOW('a', 2, time_t) /* set alarm */
48 #define ANDROID_ALARM_SET_AND_WAIT_OLD      _IOW('a', 3, time_t)
49
50 static int alarm_opened;
51 static DEFINE_SPINLOCK(alarm_slock);
52 static struct wake_lock alarm_wake_lock;
53 static DECLARE_WAIT_QUEUE_HEAD(alarm_wait_queue);
54 static uint32_t alarm_pending;
55 static uint32_t alarm_enabled;
56 static uint32_t wait_pending;
57
58 static struct alarm alarms[ANDROID_ALARM_TYPE_COUNT];
59
60 static long alarm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
61 {
62         int rv = 0;
63         unsigned long flags;
64         struct timespec new_alarm_time;
65         struct timespec new_rtc_time;
66         struct timespec tmp_time;
67         enum android_alarm_type alarm_type = ANDROID_ALARM_IOCTL_TO_TYPE(cmd);
68         uint32_t alarm_type_mask = 1U << alarm_type;
69
70         if (alarm_type >= ANDROID_ALARM_TYPE_COUNT)
71                 return -EINVAL;
72
73         if (ANDROID_ALARM_BASE_CMD(cmd) != ANDROID_ALARM_GET_TIME(0)) {
74                 if ((file->f_flags & O_ACCMODE) == O_RDONLY)
75                         return -EPERM;
76                 if (file->private_data == NULL &&
77                     cmd != ANDROID_ALARM_SET_RTC) {
78                         spin_lock_irqsave(&alarm_slock, flags);
79                         if (alarm_opened) {
80                                 spin_unlock_irqrestore(&alarm_slock, flags);
81                                 return -EBUSY;
82                         }
83                         alarm_opened = 1;
84                         file->private_data = (void *)1;
85                         spin_unlock_irqrestore(&alarm_slock, flags);
86                 }
87         }
88
89         switch (ANDROID_ALARM_BASE_CMD(cmd)) {
90         case ANDROID_ALARM_CLEAR(0):
91                 spin_lock_irqsave(&alarm_slock, flags);
92                 pr_alarm(IO, "alarm %d clear\n", alarm_type);
93                 alarm_try_to_cancel(&alarms[alarm_type]);
94                 if (alarm_pending) {
95                         alarm_pending &= ~alarm_type_mask;
96                         if (!alarm_pending && !wait_pending)
97                                 wake_unlock(&alarm_wake_lock);
98                 }
99                 alarm_enabled &= ~alarm_type_mask;
100                 spin_unlock_irqrestore(&alarm_slock, flags);
101                 break;
102
103         case ANDROID_ALARM_SET_OLD:
104         case ANDROID_ALARM_SET_AND_WAIT_OLD:
105                 if (get_user(new_alarm_time.tv_sec, (int __user *)arg)) {
106                         rv = -EFAULT;
107                         goto err1;
108                 }
109                 new_alarm_time.tv_nsec = 0;
110                 goto from_old_alarm_set;
111
112         case ANDROID_ALARM_SET_AND_WAIT(0):
113         case ANDROID_ALARM_SET(0):
114                 if (copy_from_user(&new_alarm_time, (void __user *)arg,
115                     sizeof(new_alarm_time))) {
116                         rv = -EFAULT;
117                         goto err1;
118                 }
119 from_old_alarm_set:
120                 spin_lock_irqsave(&alarm_slock, flags);
121                 pr_alarm(IO, "alarm %d set %ld.%09ld\n", alarm_type,
122                         new_alarm_time.tv_sec, new_alarm_time.tv_nsec);
123                 alarm_enabled |= alarm_type_mask;
124                 alarm_start_range(&alarms[alarm_type],
125                         timespec_to_ktime(new_alarm_time),
126                         timespec_to_ktime(new_alarm_time));
127                 spin_unlock_irqrestore(&alarm_slock, flags);
128                 if (ANDROID_ALARM_BASE_CMD(cmd) != ANDROID_ALARM_SET_AND_WAIT(0)
129                     && cmd != ANDROID_ALARM_SET_AND_WAIT_OLD)
130                         break;
131                 /* fall though */
132         case ANDROID_ALARM_WAIT:
133                 spin_lock_irqsave(&alarm_slock, flags);
134                 pr_alarm(IO, "alarm wait\n");
135                 if (!alarm_pending && wait_pending) {
136                         wake_unlock(&alarm_wake_lock);
137                         wait_pending = 0;
138                 }
139                 spin_unlock_irqrestore(&alarm_slock, flags);
140                 rv = wait_event_interruptible(alarm_wait_queue, alarm_pending);
141                 if (rv)
142                         goto err1;
143                 spin_lock_irqsave(&alarm_slock, flags);
144                 rv = alarm_pending;
145                 wait_pending = 1;
146                 alarm_pending = 0;
147                 spin_unlock_irqrestore(&alarm_slock, flags);
148                 break;
149         case ANDROID_ALARM_SET_RTC:
150                 if (copy_from_user(&new_rtc_time, (void __user *)arg,
151                     sizeof(new_rtc_time))) {
152                         rv = -EFAULT;
153                         goto err1;
154                 }
155                 rv = alarm_set_rtc(new_rtc_time);
156                 spin_lock_irqsave(&alarm_slock, flags);
157                 alarm_pending |= ANDROID_ALARM_TIME_CHANGE_MASK;
158                 wake_up(&alarm_wait_queue);
159                 spin_unlock_irqrestore(&alarm_slock, flags);
160                 if (rv < 0)
161                         goto err1;
162                 break;
163         case ANDROID_ALARM_GET_TIME(0):
164                 switch (alarm_type) {
165                 case ANDROID_ALARM_RTC_WAKEUP:
166                 case ANDROID_ALARM_RTC:
167                         getnstimeofday(&tmp_time);
168                         break;
169                 case ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP:
170                 case ANDROID_ALARM_ELAPSED_REALTIME:
171                         tmp_time =
172                                 ktime_to_timespec(alarm_get_elapsed_realtime());
173                         break;
174                 case ANDROID_ALARM_TYPE_COUNT:
175                 case ANDROID_ALARM_SYSTEMTIME:
176                         ktime_get_ts(&tmp_time);
177                         break;
178                 }
179                 if (copy_to_user((void __user *)arg, &tmp_time,
180                     sizeof(tmp_time))) {
181                         rv = -EFAULT;
182                         goto err1;
183                 }
184                 break;
185
186         default:
187                 rv = -EINVAL;
188                 goto err1;
189         }
190 err1:
191         return rv;
192 }
193
194 static int alarm_open(struct inode *inode, struct file *file)
195 {
196         file->private_data = NULL;
197         return 0;
198 }
199
200 static int alarm_release(struct inode *inode, struct file *file)
201 {
202         int i;
203         unsigned long flags;
204
205         spin_lock_irqsave(&alarm_slock, flags);
206         if (file->private_data != 0) {
207                 for (i = 0; i < ANDROID_ALARM_TYPE_COUNT; i++) {
208                         uint32_t alarm_type_mask = 1U << i;
209                         if (alarm_enabled & alarm_type_mask) {
210                                 pr_alarm(INFO, "alarm_release: clear alarm, "
211                                         "pending %d\n",
212                                         !!(alarm_pending & alarm_type_mask));
213                                 alarm_enabled &= ~alarm_type_mask;
214                         }
215                         spin_unlock_irqrestore(&alarm_slock, flags);
216                         alarm_cancel(&alarms[i]);
217                         spin_lock_irqsave(&alarm_slock, flags);
218                 }
219                 if (alarm_pending | wait_pending) {
220                         if (alarm_pending)
221                                 pr_alarm(INFO, "alarm_release: clear "
222                                         "pending alarms %x\n", alarm_pending);
223                         wake_unlock(&alarm_wake_lock);
224                         wait_pending = 0;
225                         alarm_pending = 0;
226                 }
227                 alarm_opened = 0;
228         }
229         spin_unlock_irqrestore(&alarm_slock, flags);
230         return 0;
231 }
232
233 static void alarm_triggered(struct alarm *alarm)
234 {
235         unsigned long flags;
236         uint32_t alarm_type_mask = 1U << alarm->type;
237
238         pr_alarm(INT, "alarm_triggered type %d\n", alarm->type);
239         spin_lock_irqsave(&alarm_slock, flags);
240         if (alarm_enabled & alarm_type_mask) {
241                 wake_lock_timeout(&alarm_wake_lock, 5 * HZ);
242                 alarm_enabled &= ~alarm_type_mask;
243                 alarm_pending |= alarm_type_mask;
244                 wake_up(&alarm_wait_queue);
245         }
246         spin_unlock_irqrestore(&alarm_slock, flags);
247 }
248
249 static const struct file_operations alarm_fops = {
250         .owner = THIS_MODULE,
251         .unlocked_ioctl = alarm_ioctl,
252         .open = alarm_open,
253         .release = alarm_release,
254 };
255
256 static struct miscdevice alarm_device = {
257         .minor = MISC_DYNAMIC_MINOR,
258         .name = "alarm",
259         .fops = &alarm_fops,
260 };
261
262 static int __init alarm_dev_init(void)
263 {
264         int err;
265         int i;
266
267         err = misc_register(&alarm_device);
268         if (err)
269                 return err;
270
271         for (i = 0; i < ANDROID_ALARM_TYPE_COUNT; i++)
272                 alarm_init(&alarms[i], i, alarm_triggered);
273         wake_lock_init(&alarm_wake_lock, WAKE_LOCK_SUSPEND, "alarm");
274
275         return 0;
276 }
277
278 static void  __exit alarm_dev_exit(void)
279 {
280         misc_deregister(&alarm_device);
281         wake_lock_destroy(&alarm_wake_lock);
282 }
283
284 module_init(alarm_dev_init);
285 module_exit(alarm_dev_exit);
286