diff options
Diffstat (limited to 'drivers/staging/android/alarm-dev.c')
| -rw-r--r-- | drivers/staging/android/alarm-dev.c | 446 |
1 files changed, 446 insertions, 0 deletions
diff --git a/drivers/staging/android/alarm-dev.c b/drivers/staging/android/alarm-dev.c new file mode 100644 index 00000000000..f200e8a8432 --- /dev/null +++ b/drivers/staging/android/alarm-dev.c @@ -0,0 +1,446 @@ +/* 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/time.h> +#include <linux/module.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/alarmtimer.h> +#include "android_alarm.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 alarm_dbg(debug_level_mask, fmt, ...) \ +do { \ + if (debug_mask & ANDROID_ALARM_PRINT_##debug_level_mask) \ + pr_info(fmt, ##__VA_ARGS__); \ +} while (0) + +#define ANDROID_ALARM_WAKEUP_MASK ( \ + ANDROID_ALARM_RTC_WAKEUP_MASK | \ + ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP_MASK) + +static int alarm_opened; +static DEFINE_SPINLOCK(alarm_slock); +static struct wakeup_source 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; + +struct devalarm { + union { + struct hrtimer hrt; + struct alarm alrm; + } u; + enum android_alarm_type type; +}; + +static struct devalarm alarms[ANDROID_ALARM_TYPE_COUNT]; + +/** + * is_wakeup() - Checks to see if this alarm can wake the device + * @type: The type of alarm being checked + * + * Return: 1 if this is a wakeup alarm, otherwise 0 + */ +static int is_wakeup(enum android_alarm_type type) +{ + return type == ANDROID_ALARM_RTC_WAKEUP || + type == ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP; +} + +static void devalarm_start(struct devalarm *alrm, ktime_t exp) +{ + if (is_wakeup(alrm->type)) + alarm_start(&alrm->u.alrm, exp); + else + hrtimer_start(&alrm->u.hrt, exp, HRTIMER_MODE_ABS); +} + +static int devalarm_try_to_cancel(struct devalarm *alrm) +{ + if (is_wakeup(alrm->type)) + return alarm_try_to_cancel(&alrm->u.alrm); + return hrtimer_try_to_cancel(&alrm->u.hrt); +} + +static void devalarm_cancel(struct devalarm *alrm) +{ + if (is_wakeup(alrm->type)) + alarm_cancel(&alrm->u.alrm); + else + hrtimer_cancel(&alrm->u.hrt); +} + +static void alarm_clear(enum android_alarm_type alarm_type) +{ + uint32_t alarm_type_mask = 1U << alarm_type; + unsigned long flags; + + spin_lock_irqsave(&alarm_slock, flags); + alarm_dbg(IO, "alarm %d clear\n", alarm_type); + devalarm_try_to_cancel(&alarms[alarm_type]); + if (alarm_pending) { + alarm_pending &= ~alarm_type_mask; + if (!alarm_pending && !wait_pending) + __pm_relax(&alarm_wake_lock); + } + alarm_enabled &= ~alarm_type_mask; + spin_unlock_irqrestore(&alarm_slock, flags); +} + +static void alarm_set(enum android_alarm_type alarm_type, + struct timespec *ts) +{ + uint32_t alarm_type_mask = 1U << alarm_type; + unsigned long flags; + + spin_lock_irqsave(&alarm_slock, flags); + alarm_dbg(IO, "alarm %d set %ld.%09ld\n", + alarm_type, ts->tv_sec, ts->tv_nsec); + alarm_enabled |= alarm_type_mask; + devalarm_start(&alarms[alarm_type], timespec_to_ktime(*ts)); + spin_unlock_irqrestore(&alarm_slock, flags); +} + +static int alarm_wait(void) +{ + unsigned long flags; + int rv = 0; + + spin_lock_irqsave(&alarm_slock, flags); + alarm_dbg(IO, "alarm wait\n"); + if (!alarm_pending && wait_pending) { + __pm_relax(&alarm_wake_lock); + wait_pending = 0; + } + spin_unlock_irqrestore(&alarm_slock, flags); + + rv = wait_event_interruptible(alarm_wait_queue, alarm_pending); + if (rv) + return rv; + + spin_lock_irqsave(&alarm_slock, flags); + rv = alarm_pending; + wait_pending = 1; + alarm_pending = 0; + spin_unlock_irqrestore(&alarm_slock, flags); + + return rv; +} + +static int alarm_set_rtc(struct timespec *ts) +{ + struct rtc_time new_rtc_tm; + struct rtc_device *rtc_dev; + unsigned long flags; + int rv = 0; + + rtc_time_to_tm(ts->tv_sec, &new_rtc_tm); + rtc_dev = alarmtimer_get_rtcdev(); + rv = do_settimeofday(ts); + if (rv < 0) + return rv; + if (rtc_dev) + rv = rtc_set_time(rtc_dev, &new_rtc_tm); + + spin_lock_irqsave(&alarm_slock, flags); + alarm_pending |= ANDROID_ALARM_TIME_CHANGE_MASK; + wake_up(&alarm_wait_queue); + spin_unlock_irqrestore(&alarm_slock, flags); + + return rv; +} + +static int alarm_get_time(enum android_alarm_type alarm_type, + struct timespec *ts) +{ + int rv = 0; + + switch (alarm_type) { + case ANDROID_ALARM_RTC_WAKEUP: + case ANDROID_ALARM_RTC: + getnstimeofday(ts); + break; + case ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP: + case ANDROID_ALARM_ELAPSED_REALTIME: + get_monotonic_boottime(ts); + break; + case ANDROID_ALARM_SYSTEMTIME: + ktime_get_ts(ts); + break; + default: + rv = -EINVAL; + } + return rv; +} + +static long alarm_do_ioctl(struct file *file, unsigned int cmd, + struct timespec *ts) +{ + int rv = 0; + unsigned long flags; + enum android_alarm_type alarm_type = ANDROID_ALARM_IOCTL_TO_TYPE(cmd); + + 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): + alarm_clear(alarm_type); + break; + case ANDROID_ALARM_SET(0): + alarm_set(alarm_type, ts); + break; + case ANDROID_ALARM_SET_AND_WAIT(0): + alarm_set(alarm_type, ts); + /* fall though */ + case ANDROID_ALARM_WAIT: + rv = alarm_wait(); + break; + case ANDROID_ALARM_SET_RTC: + rv = alarm_set_rtc(ts); + break; + case ANDROID_ALARM_GET_TIME(0): + rv = alarm_get_time(alarm_type, ts); + break; + + default: + rv = -EINVAL; + } + return rv; +} + +static long alarm_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + + struct timespec ts; + int rv; + + switch (ANDROID_ALARM_BASE_CMD(cmd)) { + case ANDROID_ALARM_SET_AND_WAIT(0): + case ANDROID_ALARM_SET(0): + case ANDROID_ALARM_SET_RTC: + if (copy_from_user(&ts, (void __user *)arg, sizeof(ts))) + return -EFAULT; + break; + } + + rv = alarm_do_ioctl(file, cmd, &ts); + if (rv) + return rv; + + switch (ANDROID_ALARM_BASE_CMD(cmd)) { + case ANDROID_ALARM_GET_TIME(0): + if (copy_to_user((void __user *)arg, &ts, sizeof(ts))) + return -EFAULT; + break; + } + + return 0; +} + +#ifdef CONFIG_COMPAT +static long alarm_compat_ioctl(struct file *file, unsigned int cmd, + unsigned long arg) +{ + + struct timespec ts; + int rv; + + switch (ANDROID_ALARM_BASE_CMD(cmd)) { + case ANDROID_ALARM_SET_AND_WAIT_COMPAT(0): + case ANDROID_ALARM_SET_COMPAT(0): + case ANDROID_ALARM_SET_RTC_COMPAT: + if (compat_get_timespec(&ts, (void __user *)arg)) + return -EFAULT; + /* fall through */ + case ANDROID_ALARM_GET_TIME_COMPAT(0): + cmd = ANDROID_ALARM_COMPAT_TO_NORM(cmd); + break; + } + + rv = alarm_do_ioctl(file, cmd, &ts); + if (rv) + return rv; + + switch (ANDROID_ALARM_BASE_CMD(cmd)) { + case ANDROID_ALARM_GET_TIME(0): /* NOTE: we modified cmd above */ + if (compat_put_timespec(&ts, (void __user *)arg)) + return -EFAULT; + break; + } + + return 0; +} +#endif + +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) { + for (i = 0; i < ANDROID_ALARM_TYPE_COUNT; i++) { + uint32_t alarm_type_mask = 1U << i; + + if (alarm_enabled & alarm_type_mask) { + alarm_dbg(INFO, + "%s: clear alarm, pending %d\n", + __func__, + !!(alarm_pending & alarm_type_mask)); + alarm_enabled &= ~alarm_type_mask; + } + spin_unlock_irqrestore(&alarm_slock, flags); + devalarm_cancel(&alarms[i]); + spin_lock_irqsave(&alarm_slock, flags); + } + if (alarm_pending | wait_pending) { + if (alarm_pending) + alarm_dbg(INFO, "%s: clear pending alarms %x\n", + __func__, alarm_pending); + __pm_relax(&alarm_wake_lock); + wait_pending = 0; + alarm_pending = 0; + } + alarm_opened = 0; + } + spin_unlock_irqrestore(&alarm_slock, flags); + return 0; +} + +static void devalarm_triggered(struct devalarm *alarm) +{ + unsigned long flags; + uint32_t alarm_type_mask = 1U << alarm->type; + + alarm_dbg(INT, "%s: type %d\n", __func__, alarm->type); + spin_lock_irqsave(&alarm_slock, flags); + if (alarm_enabled & alarm_type_mask) { + __pm_wakeup_event(&alarm_wake_lock, 5000); /* 5secs */ + alarm_enabled &= ~alarm_type_mask; + alarm_pending |= alarm_type_mask; + wake_up(&alarm_wait_queue); + } + spin_unlock_irqrestore(&alarm_slock, flags); +} + +static enum hrtimer_restart devalarm_hrthandler(struct hrtimer *hrt) +{ + struct devalarm *devalrm = container_of(hrt, struct devalarm, u.hrt); + + devalarm_triggered(devalrm); + return HRTIMER_NORESTART; +} + +static enum alarmtimer_restart devalarm_alarmhandler(struct alarm *alrm, + ktime_t now) +{ + struct devalarm *devalrm = container_of(alrm, struct devalarm, u.alrm); + + devalarm_triggered(devalrm); + return ALARMTIMER_NORESTART; +} + + +static const struct file_operations alarm_fops = { + .owner = THIS_MODULE, + .unlocked_ioctl = alarm_ioctl, + .open = alarm_open, + .release = alarm_release, +#ifdef CONFIG_COMPAT + .compat_ioctl = alarm_compat_ioctl, +#endif +}; + +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; + + alarm_init(&alarms[ANDROID_ALARM_RTC_WAKEUP].u.alrm, + ALARM_REALTIME, devalarm_alarmhandler); + hrtimer_init(&alarms[ANDROID_ALARM_RTC].u.hrt, + CLOCK_REALTIME, HRTIMER_MODE_ABS); + alarm_init(&alarms[ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP].u.alrm, + ALARM_BOOTTIME, devalarm_alarmhandler); + hrtimer_init(&alarms[ANDROID_ALARM_ELAPSED_REALTIME].u.hrt, + CLOCK_BOOTTIME, HRTIMER_MODE_ABS); + hrtimer_init(&alarms[ANDROID_ALARM_SYSTEMTIME].u.hrt, + CLOCK_MONOTONIC, HRTIMER_MODE_ABS); + + for (i = 0; i < ANDROID_ALARM_TYPE_COUNT; i++) { + alarms[i].type = i; + if (!is_wakeup(i)) + alarms[i].u.hrt.function = devalarm_hrthandler; + } + + wakeup_source_init(&alarm_wake_lock, "alarm"); + return 0; +} + +static void __exit alarm_dev_exit(void) +{ + misc_deregister(&alarm_device); + wakeup_source_trash(&alarm_wake_lock); +} + +module_init(alarm_dev_init); +module_exit(alarm_dev_exit); + |