2601a46474
The RTC framework has an irq_set_freq() method that should be used to manage
the periodic IRQ frequency, but the current ioctl logic doesn't know how to do
that. This patch teaches it how.
This means that drivers implementing irq_set_freq() will automatically support
RTC_IRQP_{READ,SET} ioctls; that logic doesn't need duplication within the
driver.
[akpm@osdl.org: export rtc_irq_set_freq]
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Acked-by: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
269 lines
6.1 KiB
C
269 lines
6.1 KiB
C
/*
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* RTC subsystem, interface functions
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*
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* Copyright (C) 2005 Tower Technologies
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* Author: Alessandro Zummo <a.zummo@towertech.it>
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*
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* based on arch/arm/common/rtctime.c
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/rtc.h>
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int rtc_read_time(struct class_device *class_dev, struct rtc_time *tm)
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{
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int err;
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struct rtc_device *rtc = to_rtc_device(class_dev);
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err = mutex_lock_interruptible(&rtc->ops_lock);
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if (err)
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return -EBUSY;
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if (!rtc->ops)
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err = -ENODEV;
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else if (!rtc->ops->read_time)
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err = -EINVAL;
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else {
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memset(tm, 0, sizeof(struct rtc_time));
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err = rtc->ops->read_time(class_dev->dev, tm);
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}
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mutex_unlock(&rtc->ops_lock);
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return err;
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}
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EXPORT_SYMBOL_GPL(rtc_read_time);
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int rtc_set_time(struct class_device *class_dev, struct rtc_time *tm)
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{
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int err;
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struct rtc_device *rtc = to_rtc_device(class_dev);
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err = rtc_valid_tm(tm);
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if (err != 0)
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return err;
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err = mutex_lock_interruptible(&rtc->ops_lock);
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if (err)
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return -EBUSY;
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if (!rtc->ops)
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err = -ENODEV;
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else if (!rtc->ops->set_time)
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err = -EINVAL;
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else
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err = rtc->ops->set_time(class_dev->dev, tm);
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mutex_unlock(&rtc->ops_lock);
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return err;
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}
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EXPORT_SYMBOL_GPL(rtc_set_time);
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int rtc_set_mmss(struct class_device *class_dev, unsigned long secs)
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{
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int err;
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struct rtc_device *rtc = to_rtc_device(class_dev);
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err = mutex_lock_interruptible(&rtc->ops_lock);
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if (err)
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return -EBUSY;
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if (!rtc->ops)
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err = -ENODEV;
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else if (rtc->ops->set_mmss)
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err = rtc->ops->set_mmss(class_dev->dev, secs);
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else if (rtc->ops->read_time && rtc->ops->set_time) {
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struct rtc_time new, old;
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err = rtc->ops->read_time(class_dev->dev, &old);
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if (err == 0) {
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rtc_time_to_tm(secs, &new);
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/*
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* avoid writing when we're going to change the day of
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* the month. We will retry in the next minute. This
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* basically means that if the RTC must not drift
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* by more than 1 minute in 11 minutes.
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*/
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if (!((old.tm_hour == 23 && old.tm_min == 59) ||
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(new.tm_hour == 23 && new.tm_min == 59)))
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err = rtc->ops->set_time(class_dev->dev, &new);
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}
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}
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else
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err = -EINVAL;
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mutex_unlock(&rtc->ops_lock);
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return err;
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}
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EXPORT_SYMBOL_GPL(rtc_set_mmss);
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int rtc_read_alarm(struct class_device *class_dev, struct rtc_wkalrm *alarm)
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{
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int err;
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struct rtc_device *rtc = to_rtc_device(class_dev);
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err = mutex_lock_interruptible(&rtc->ops_lock);
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if (err)
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return -EBUSY;
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if (rtc->ops == NULL)
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err = -ENODEV;
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else if (!rtc->ops->read_alarm)
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err = -EINVAL;
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else {
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memset(alarm, 0, sizeof(struct rtc_wkalrm));
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err = rtc->ops->read_alarm(class_dev->dev, alarm);
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}
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mutex_unlock(&rtc->ops_lock);
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return err;
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}
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EXPORT_SYMBOL_GPL(rtc_read_alarm);
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int rtc_set_alarm(struct class_device *class_dev, struct rtc_wkalrm *alarm)
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{
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int err;
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struct rtc_device *rtc = to_rtc_device(class_dev);
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err = mutex_lock_interruptible(&rtc->ops_lock);
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if (err)
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return -EBUSY;
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if (!rtc->ops)
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err = -ENODEV;
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else if (!rtc->ops->set_alarm)
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err = -EINVAL;
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else
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err = rtc->ops->set_alarm(class_dev->dev, alarm);
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mutex_unlock(&rtc->ops_lock);
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return err;
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}
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EXPORT_SYMBOL_GPL(rtc_set_alarm);
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void rtc_update_irq(struct class_device *class_dev,
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unsigned long num, unsigned long events)
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{
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struct rtc_device *rtc = to_rtc_device(class_dev);
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spin_lock(&rtc->irq_lock);
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rtc->irq_data = (rtc->irq_data + (num << 8)) | events;
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spin_unlock(&rtc->irq_lock);
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spin_lock(&rtc->irq_task_lock);
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if (rtc->irq_task)
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rtc->irq_task->func(rtc->irq_task->private_data);
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spin_unlock(&rtc->irq_task_lock);
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wake_up_interruptible(&rtc->irq_queue);
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kill_fasync(&rtc->async_queue, SIGIO, POLL_IN);
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}
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EXPORT_SYMBOL_GPL(rtc_update_irq);
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struct class_device *rtc_class_open(char *name)
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{
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struct class_device *class_dev = NULL,
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*class_dev_tmp;
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down(&rtc_class->sem);
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list_for_each_entry(class_dev_tmp, &rtc_class->children, node) {
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if (strncmp(class_dev_tmp->class_id, name, BUS_ID_SIZE) == 0) {
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class_dev = class_dev_tmp;
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break;
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}
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}
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if (class_dev) {
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if (!try_module_get(to_rtc_device(class_dev)->owner))
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class_dev = NULL;
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}
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up(&rtc_class->sem);
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return class_dev;
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}
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EXPORT_SYMBOL_GPL(rtc_class_open);
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void rtc_class_close(struct class_device *class_dev)
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{
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module_put(to_rtc_device(class_dev)->owner);
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}
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EXPORT_SYMBOL_GPL(rtc_class_close);
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int rtc_irq_register(struct class_device *class_dev, struct rtc_task *task)
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{
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int retval = -EBUSY;
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struct rtc_device *rtc = to_rtc_device(class_dev);
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if (task == NULL || task->func == NULL)
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return -EINVAL;
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spin_lock(&rtc->irq_task_lock);
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if (rtc->irq_task == NULL) {
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rtc->irq_task = task;
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retval = 0;
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}
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spin_unlock(&rtc->irq_task_lock);
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return retval;
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}
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EXPORT_SYMBOL_GPL(rtc_irq_register);
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void rtc_irq_unregister(struct class_device *class_dev, struct rtc_task *task)
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{
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struct rtc_device *rtc = to_rtc_device(class_dev);
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spin_lock(&rtc->irq_task_lock);
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if (rtc->irq_task == task)
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rtc->irq_task = NULL;
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spin_unlock(&rtc->irq_task_lock);
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}
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EXPORT_SYMBOL_GPL(rtc_irq_unregister);
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int rtc_irq_set_state(struct class_device *class_dev, struct rtc_task *task, int enabled)
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{
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int err = 0;
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unsigned long flags;
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struct rtc_device *rtc = to_rtc_device(class_dev);
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if (rtc->ops->irq_set_state == NULL)
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return -ENXIO;
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spin_lock_irqsave(&rtc->irq_task_lock, flags);
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if (rtc->irq_task != task)
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err = -ENXIO;
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spin_unlock_irqrestore(&rtc->irq_task_lock, flags);
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if (err == 0)
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err = rtc->ops->irq_set_state(class_dev->dev, enabled);
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return err;
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}
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EXPORT_SYMBOL_GPL(rtc_irq_set_state);
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int rtc_irq_set_freq(struct class_device *class_dev, struct rtc_task *task, int freq)
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{
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int err = 0;
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unsigned long flags;
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struct rtc_device *rtc = to_rtc_device(class_dev);
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if (rtc->ops->irq_set_freq == NULL)
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return -ENXIO;
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spin_lock_irqsave(&rtc->irq_task_lock, flags);
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if (rtc->irq_task != task)
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err = -ENXIO;
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spin_unlock_irqrestore(&rtc->irq_task_lock, flags);
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if (err == 0) {
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err = rtc->ops->irq_set_freq(class_dev->dev, freq);
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if (err == 0)
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rtc->irq_freq = freq;
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}
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return err;
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}
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EXPORT_SYMBOL_GPL(rtc_irq_set_freq);
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