| /* drivers/rtc/alarm-dev.c |
| * |
| * Copyright (C) 2007-2009 Google, Inc. |
| * |
| * This software is licensed under the terms of the GNU General Public |
| * License version 2, as published by the Free Software Foundation, and |
| * may be copied, distributed, and modified under those terms. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/android_alarm.h> |
| #include <linux/device.h> |
| #include <linux/miscdevice.h> |
| #include <linux/fs.h> |
| #include <linux/platform_device.h> |
| #include <linux/sched.h> |
| #include <linux/spinlock.h> |
| #include <linux/uaccess.h> |
| #include <linux/wakelock.h> |
| |
| #include <asm/mach/time.h> |
| |
| #define ANDROID_ALARM_PRINT_INFO (1U << 0) |
| #define ANDROID_ALARM_PRINT_IO (1U << 1) |
| #define ANDROID_ALARM_PRINT_INT (1U << 2) |
| |
| static int debug_mask = ANDROID_ALARM_PRINT_INFO; |
| module_param_named(debug_mask, debug_mask, int, S_IRUGO | S_IWUSR | S_IWGRP); |
| |
| #define pr_alarm(debug_level_mask, args...) \ |
| do { \ |
| if (debug_mask & ANDROID_ALARM_PRINT_##debug_level_mask) { \ |
| pr_info(args); \ |
| } \ |
| } while (0) |
| |
| #define ANDROID_ALARM_WAKEUP_MASK ( \ |
| ANDROID_ALARM_RTC_WAKEUP_MASK | \ |
| ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP_MASK) |
| |
| /* support old usespace code */ |
| #define ANDROID_ALARM_SET_OLD _IOW('a', 2, time_t) /* set alarm */ |
| #define ANDROID_ALARM_SET_AND_WAIT_OLD _IOW('a', 3, time_t) |
| |
| static int alarm_opened; |
| static DEFINE_SPINLOCK(alarm_slock); |
| static struct wake_lock alarm_wake_lock; |
| static DECLARE_WAIT_QUEUE_HEAD(alarm_wait_queue); |
| static uint32_t alarm_pending; |
| static uint32_t alarm_enabled; |
| static uint32_t wait_pending; |
| |
| static struct alarm alarms[ANDROID_ALARM_TYPE_COUNT]; |
| |
| static long alarm_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
| { |
| int rv = 0; |
| unsigned long flags; |
| struct timespec new_alarm_time; |
| struct timespec new_rtc_time; |
| struct timespec tmp_time; |
| enum android_alarm_type alarm_type = ANDROID_ALARM_IOCTL_TO_TYPE(cmd); |
| uint32_t alarm_type_mask = 1U << alarm_type; |
| |
| if (alarm_type >= ANDROID_ALARM_TYPE_COUNT) |
| return -EINVAL; |
| |
| if (ANDROID_ALARM_BASE_CMD(cmd) != ANDROID_ALARM_GET_TIME(0)) { |
| if ((file->f_flags & O_ACCMODE) == O_RDONLY) |
| return -EPERM; |
| if (file->private_data == NULL && |
| cmd != ANDROID_ALARM_SET_RTC) { |
| spin_lock_irqsave(&alarm_slock, flags); |
| if (alarm_opened) { |
| spin_unlock_irqrestore(&alarm_slock, flags); |
| return -EBUSY; |
| } |
| alarm_opened = 1; |
| file->private_data = (void *)1; |
| spin_unlock_irqrestore(&alarm_slock, flags); |
| } |
| } |
| |
| switch (ANDROID_ALARM_BASE_CMD(cmd)) { |
| case ANDROID_ALARM_CLEAR(0): |
| spin_lock_irqsave(&alarm_slock, flags); |
| pr_alarm(IO, "alarm %d clear\n", alarm_type); |
| alarm_try_to_cancel(&alarms[alarm_type]); |
| if (alarm_pending) { |
| alarm_pending &= ~alarm_type_mask; |
| if (!alarm_pending && !wait_pending) |
| wake_unlock(&alarm_wake_lock); |
| } |
| alarm_enabled &= ~alarm_type_mask; |
| if (alarm_type == ANDROID_ALARM_RTC_POWEROFF_WAKEUP) |
| set_power_on_alarm(0); |
| spin_unlock_irqrestore(&alarm_slock, flags); |
| break; |
| |
| case ANDROID_ALARM_SET_OLD: |
| case ANDROID_ALARM_SET_AND_WAIT_OLD: |
| if (get_user(new_alarm_time.tv_sec, (int __user *)arg)) { |
| rv = -EFAULT; |
| goto err1; |
| } |
| new_alarm_time.tv_nsec = 0; |
| goto from_old_alarm_set; |
| |
| case ANDROID_ALARM_SET_AND_WAIT(0): |
| case ANDROID_ALARM_SET(0): |
| if (copy_from_user(&new_alarm_time, (void __user *)arg, |
| sizeof(new_alarm_time))) { |
| rv = -EFAULT; |
| goto err1; |
| } |
| from_old_alarm_set: |
| spin_lock_irqsave(&alarm_slock, flags); |
| pr_alarm(IO, "alarm %d set %ld.%09ld\n", alarm_type, |
| new_alarm_time.tv_sec, new_alarm_time.tv_nsec); |
| alarm_enabled |= alarm_type_mask; |
| alarm_start_range(&alarms[alarm_type], |
| timespec_to_ktime(new_alarm_time), |
| timespec_to_ktime(new_alarm_time)); |
| if ((alarm_type == ANDROID_ALARM_RTC_POWEROFF_WAKEUP) && |
| (ANDROID_ALARM_BASE_CMD(cmd) == |
| ANDROID_ALARM_SET(0))) |
| set_power_on_alarm(new_alarm_time.tv_sec); |
| spin_unlock_irqrestore(&alarm_slock, flags); |
| if (ANDROID_ALARM_BASE_CMD(cmd) != ANDROID_ALARM_SET_AND_WAIT(0) |
| && cmd != ANDROID_ALARM_SET_AND_WAIT_OLD) |
| break; |
| /* fall though */ |
| case ANDROID_ALARM_WAIT: |
| spin_lock_irqsave(&alarm_slock, flags); |
| pr_alarm(IO, "alarm wait\n"); |
| if (!alarm_pending && wait_pending) { |
| wake_unlock(&alarm_wake_lock); |
| wait_pending = 0; |
| } |
| spin_unlock_irqrestore(&alarm_slock, flags); |
| rv = wait_event_interruptible(alarm_wait_queue, alarm_pending); |
| if (rv) |
| goto err1; |
| spin_lock_irqsave(&alarm_slock, flags); |
| rv = alarm_pending; |
| wait_pending = 1; |
| alarm_pending = 0; |
| spin_unlock_irqrestore(&alarm_slock, flags); |
| break; |
| case ANDROID_ALARM_SET_RTC: |
| if (copy_from_user(&new_rtc_time, (void __user *)arg, |
| sizeof(new_rtc_time))) { |
| rv = -EFAULT; |
| goto err1; |
| } |
| rv = alarm_set_rtc(new_rtc_time); |
| spin_lock_irqsave(&alarm_slock, flags); |
| alarm_pending |= ANDROID_ALARM_TIME_CHANGE_MASK; |
| wake_up(&alarm_wait_queue); |
| spin_unlock_irqrestore(&alarm_slock, flags); |
| if (rv < 0) |
| goto err1; |
| break; |
| case ANDROID_ALARM_GET_TIME(0): |
| switch (alarm_type) { |
| case ANDROID_ALARM_RTC_WAKEUP: |
| case ANDROID_ALARM_RTC: |
| case ANDROID_ALARM_RTC_POWEROFF_WAKEUP: |
| getnstimeofday(&tmp_time); |
| break; |
| case ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP: |
| case ANDROID_ALARM_ELAPSED_REALTIME: |
| tmp_time = |
| ktime_to_timespec(alarm_get_elapsed_realtime()); |
| break; |
| case ANDROID_ALARM_TYPE_COUNT: |
| case ANDROID_ALARM_SYSTEMTIME: |
| ktime_get_ts(&tmp_time); |
| break; |
| } |
| if (copy_to_user((void __user *)arg, &tmp_time, |
| sizeof(tmp_time))) { |
| rv = -EFAULT; |
| goto err1; |
| } |
| break; |
| |
| default: |
| rv = -EINVAL; |
| goto err1; |
| } |
| err1: |
| return rv; |
| } |
| |
| static int alarm_open(struct inode *inode, struct file *file) |
| { |
| file->private_data = NULL; |
| return 0; |
| } |
| |
| static int alarm_release(struct inode *inode, struct file *file) |
| { |
| int i; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&alarm_slock, flags); |
| if (file->private_data != 0) { |
| for (i = 0; i < ANDROID_ALARM_TYPE_COUNT; i++) { |
| uint32_t alarm_type_mask = 1U << i; |
| if (alarm_enabled & alarm_type_mask) { |
| pr_alarm(INFO, "alarm_release: clear alarm, " |
| "pending %d\n", |
| !!(alarm_pending & alarm_type_mask)); |
| alarm_enabled &= ~alarm_type_mask; |
| } |
| spin_unlock_irqrestore(&alarm_slock, flags); |
| alarm_cancel(&alarms[i]); |
| spin_lock_irqsave(&alarm_slock, flags); |
| } |
| if (alarm_pending | wait_pending) { |
| if (alarm_pending) |
| pr_alarm(INFO, "alarm_release: clear " |
| "pending alarms %x\n", alarm_pending); |
| wake_unlock(&alarm_wake_lock); |
| wait_pending = 0; |
| alarm_pending = 0; |
| } |
| alarm_opened = 0; |
| } |
| spin_unlock_irqrestore(&alarm_slock, flags); |
| return 0; |
| } |
| |
| static void alarm_triggered(struct alarm *alarm) |
| { |
| unsigned long flags; |
| uint32_t alarm_type_mask = 1U << alarm->type; |
| |
| pr_alarm(INT, "alarm_triggered type %d\n", alarm->type); |
| spin_lock_irqsave(&alarm_slock, flags); |
| if (alarm_enabled & alarm_type_mask) { |
| wake_lock_timeout(&alarm_wake_lock, 5 * HZ); |
| alarm_enabled &= ~alarm_type_mask; |
| alarm_pending |= alarm_type_mask; |
| wake_up(&alarm_wait_queue); |
| } |
| spin_unlock_irqrestore(&alarm_slock, flags); |
| } |
| |
| static const struct file_operations alarm_fops = { |
| .owner = THIS_MODULE, |
| .unlocked_ioctl = alarm_ioctl, |
| .open = alarm_open, |
| .release = alarm_release, |
| }; |
| |
| static struct miscdevice alarm_device = { |
| .minor = MISC_DYNAMIC_MINOR, |
| .name = "alarm", |
| .fops = &alarm_fops, |
| }; |
| |
| static int __init alarm_dev_init(void) |
| { |
| int err; |
| int i; |
| |
| err = misc_register(&alarm_device); |
| if (err) |
| return err; |
| |
| for (i = 0; i < ANDROID_ALARM_TYPE_COUNT; i++) |
| alarm_init(&alarms[i], i, alarm_triggered); |
| wake_lock_init(&alarm_wake_lock, WAKE_LOCK_SUSPEND, "alarm"); |
| |
| return 0; |
| } |
| |
| static void __exit alarm_dev_exit(void) |
| { |
| misc_deregister(&alarm_device); |
| wake_lock_destroy(&alarm_wake_lock); |
| } |
| |
| module_init(alarm_dev_init); |
| module_exit(alarm_dev_exit); |
| |