int err;
struct rtc_device *rtc = container_of(inode->i_cdev,
struct rtc_device, char_dev);
- struct rtc_class_ops *ops = rtc->ops;
+ const struct rtc_class_ops *ops = rtc->ops;
/* We keep the lock as long as the device is in use
* and return immediately if busy
return err;
}
+#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
+/*
+ * Routine to poll RTC seconds field for change as often as possible,
+ * after first RTC_UIE use timer to reduce polling
+ */
+static void rtc_uie_task(struct work_struct *work)
+{
+ struct rtc_device *rtc =
+ container_of(work, struct rtc_device, uie_task);
+ struct rtc_time tm;
+ int num = 0;
+ int err;
+
+ err = rtc_read_time(&rtc->class_dev, &tm);
+
+ local_irq_disable();
+ spin_lock(&rtc->irq_lock);
+ if (rtc->stop_uie_polling || err) {
+ rtc->uie_task_active = 0;
+ } else if (rtc->oldsecs != tm.tm_sec) {
+ num = (tm.tm_sec + 60 - rtc->oldsecs) % 60;
+ rtc->oldsecs = tm.tm_sec;
+ rtc->uie_timer.expires = jiffies + HZ - (HZ/10);
+ rtc->uie_timer_active = 1;
+ rtc->uie_task_active = 0;
+ add_timer(&rtc->uie_timer);
+ } else if (schedule_work(&rtc->uie_task) == 0) {
+ rtc->uie_task_active = 0;
+ }
+ spin_unlock(&rtc->irq_lock);
+ if (num)
+ rtc_update_irq(&rtc->class_dev, num, RTC_UF | RTC_IRQF);
+ local_irq_enable();
+}
+static void rtc_uie_timer(unsigned long data)
+{
+ struct rtc_device *rtc = (struct rtc_device *)data;
+ unsigned long flags;
+
+ spin_lock_irqsave(&rtc->irq_lock, flags);
+ rtc->uie_timer_active = 0;
+ rtc->uie_task_active = 1;
+ if ((schedule_work(&rtc->uie_task) == 0))
+ rtc->uie_task_active = 0;
+ spin_unlock_irqrestore(&rtc->irq_lock, flags);
+}
+
+static void clear_uie(struct rtc_device *rtc)
+{
+ spin_lock_irq(&rtc->irq_lock);
+ if (rtc->irq_active) {
+ rtc->stop_uie_polling = 1;
+ if (rtc->uie_timer_active) {
+ spin_unlock_irq(&rtc->irq_lock);
+ del_timer_sync(&rtc->uie_timer);
+ spin_lock_irq(&rtc->irq_lock);
+ rtc->uie_timer_active = 0;
+ }
+ if (rtc->uie_task_active) {
+ spin_unlock_irq(&rtc->irq_lock);
+ flush_scheduled_work();
+ spin_lock_irq(&rtc->irq_lock);
+ }
+ rtc->irq_active = 0;
+ }
+ spin_unlock_irq(&rtc->irq_lock);
+}
+
+static int set_uie(struct rtc_device *rtc)
+{
+ struct rtc_time tm;
+ int err;
+
+ err = rtc_read_time(&rtc->class_dev, &tm);
+ if (err)
+ return err;
+ spin_lock_irq(&rtc->irq_lock);
+ if (!rtc->irq_active) {
+ rtc->irq_active = 1;
+ rtc->stop_uie_polling = 0;
+ rtc->oldsecs = tm.tm_sec;
+ rtc->uie_task_active = 1;
+ if (schedule_work(&rtc->uie_task) == 0)
+ rtc->uie_task_active = 0;
+ }
+ rtc->irq_data = 0;
+ spin_unlock_irq(&rtc->irq_lock);
+ return 0;
+}
+#endif /* CONFIG_RTC_INTF_DEV_UIE_EMUL */
static ssize_t
rtc_dev_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
int err = 0;
struct class_device *class_dev = file->private_data;
struct rtc_device *rtc = to_rtc_device(class_dev);
- struct rtc_class_ops *ops = rtc->ops;
+ const struct rtc_class_ops *ops = rtc->ops;
struct rtc_time tm;
struct rtc_wkalrm alarm;
void __user *uarg = (void __user *) arg;
+ /* check that the calling task has appropriate permissions
+ * for certain ioctls. doing this check here is useful
+ * to avoid duplicate code in each driver.
+ */
+ switch (cmd) {
+ case RTC_EPOCH_SET:
+ case RTC_SET_TIME:
+ if (!capable(CAP_SYS_TIME))
+ return -EACCES;
+ break;
+
+ case RTC_IRQP_SET:
+ if (arg > rtc->max_user_freq && !capable(CAP_SYS_RESOURCE))
+ return -EACCES;
+ break;
+
+ case RTC_PIE_ON:
+ if (!capable(CAP_SYS_RESOURCE))
+ return -EACCES;
+ break;
+ }
+
/* avoid conflicting IRQ users */
if (cmd == RTC_PIE_ON || cmd == RTC_PIE_OFF || cmd == RTC_IRQP_SET) {
- spin_lock(&rtc->irq_task_lock);
+ spin_lock_irq(&rtc->irq_task_lock);
if (rtc->irq_task)
err = -EBUSY;
- spin_unlock(&rtc->irq_task_lock);
+ spin_unlock_irq(&rtc->irq_task_lock);
if (err < 0)
return err;
break;
case RTC_SET_TIME:
- if (!capable(CAP_SYS_TIME))
- return -EACCES;
-
if (copy_from_user(&tm, uarg, sizeof(tm)))
return -EFAULT;
err = rtc_set_time(class_dev, &tm);
break;
+
+ case RTC_IRQP_READ:
+ if (ops->irq_set_freq)
+ err = put_user(rtc->irq_freq, (unsigned long *) arg);
+ break;
+
+ case RTC_IRQP_SET:
+ if (ops->irq_set_freq)
+ err = rtc_irq_set_freq(class_dev, rtc->irq_task, arg);
+ break;
+
#if 0
case RTC_EPOCH_SET:
#ifndef rtc_epoch
err = -EINVAL;
break;
}
- if (!capable(CAP_SYS_TIME)) {
- err = -EACCES;
- break;
- }
rtc_epoch = arg;
err = 0;
#endif
return -EFAULT;
break;
+#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
+ case RTC_UIE_OFF:
+ clear_uie(rtc);
+ return 0;
+
+ case RTC_UIE_ON:
+ return set_uie(rtc);
+#endif
default:
err = -ENOTTY;
break;
{
struct rtc_device *rtc = to_rtc_device(file->private_data);
+#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
+ clear_uie(rtc);
+#endif
if (rtc->ops->release)
rtc->ops->release(rtc->class_dev.dev);
mutex_init(&rtc->char_lock);
spin_lock_init(&rtc->irq_lock);
init_waitqueue_head(&rtc->irq_queue);
+#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
+ INIT_WORK(&rtc->uie_task, rtc_uie_task);
+ setup_timer(&rtc->uie_timer, rtc_uie_timer, (unsigned long)rtc);
+#endif
cdev_init(&rtc->char_dev, &rtc_dev_fops);
rtc->char_dev.owner = rtc->owner;
if (cdev_add(&rtc->char_dev, MKDEV(MAJOR(rtc_devt), rtc->id), 1)) {
- cdev_del(&rtc->char_dev);
dev_err(class_dev->dev,
"failed to add char device %d:%d\n",
MAJOR(rtc_devt), rtc->id);
goto err_cdev_del;
}
- dev_info(class_dev->dev, "rtc intf: dev (%d:%d)\n",
+ dev_dbg(class_dev->dev, "rtc intf: dev (%d:%d)\n",
MAJOR(rtc->rtc_dev->devt),
MINOR(rtc->rtc_dev->devt));
unregister_chrdev_region(rtc_devt, RTC_DEV_MAX);
}
-module_init(rtc_dev_init);
+subsys_initcall(rtc_dev_init);
module_exit(rtc_dev_exit);
MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
git://git.onelab.eu / linux-2.6.git / blobdiff