#include <linux/module.h>
#include <linux/rtc.h>
+#include "rtc-core.h"
-static struct class *rtc_dev_class;
static dev_t rtc_devt;
#define RTC_DEV_MAX 16 /* 16 RTCs should be enough for everyone... */
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
if (!(mutex_trylock(&rtc->char_lock)))
return -EBUSY;
- file->private_data = &rtc->class_dev;
+ file->private_data = rtc;
- err = ops->open ? ops->open(rtc->class_dev.dev) : 0;
+ err = ops->open ? ops->open(rtc->dev.parent) : 0;
if (err == 0) {
spin_lock_irq(&rtc->irq_lock);
rtc->irq_data = 0;
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, &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, 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, &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)
if (ret == 0) {
/* Check for any data updates */
if (rtc->ops->read_callback)
- data = rtc->ops->read_callback(rtc->class_dev.dev,
+ data = rtc->ops->read_callback(rtc->dev.parent,
data);
if (sizeof(int) != sizeof(long) &&
unsigned int cmd, unsigned long arg)
{
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;
+ struct rtc_device *rtc = file->private_data;
+ 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;
/* try the driver's ioctl interface */
if (ops->ioctl) {
- err = ops->ioctl(class_dev->dev, cmd, arg);
- if (err != -EINVAL)
+ err = ops->ioctl(rtc->dev.parent, cmd, arg);
+ if (err != -ENOIOCTLCMD)
return err;
}
/* if the driver does not provide the ioctl interface
* or if that particular ioctl was not implemented
- * (-EINVAL), we will try to emulate here.
+ * (-ENOIOCTLCMD), we will try to emulate here.
*/
switch (cmd) {
case RTC_ALM_READ:
- err = rtc_read_alarm(class_dev, &alarm);
+ err = rtc_read_alarm(rtc, &alarm);
if (err < 0)
return err;
alarm.enabled = 0;
alarm.pending = 0;
- alarm.time.tm_mday = -1;
- alarm.time.tm_mon = -1;
- alarm.time.tm_year = -1;
alarm.time.tm_wday = -1;
alarm.time.tm_yday = -1;
alarm.time.tm_isdst = -1;
- err = rtc_set_alarm(class_dev, &alarm);
+
+ /* RTC_ALM_SET alarms may be up to 24 hours in the future.
+ * Rather than expecting every RTC to implement "don't care"
+ * for day/month/year fields, just force the alarm to have
+ * the right values for those fields.
+ *
+ * RTC_WKALM_SET should be used instead. Not only does it
+ * eliminate the need for a separate RTC_AIE_ON call, it
+ * doesn't have the "alarm 23:59:59 in the future" race.
+ *
+ * NOTE: some legacy code may have used invalid fields as
+ * wildcards, exposing hardware "periodic alarm" capabilities.
+ * Not supported here.
+ */
+ {
+ unsigned long now, then;
+
+ err = rtc_read_time(rtc, &tm);
+ if (err < 0)
+ return err;
+ rtc_tm_to_time(&tm, &now);
+
+ alarm.time.tm_mday = tm.tm_mday;
+ alarm.time.tm_mon = tm.tm_mon;
+ alarm.time.tm_year = tm.tm_year;
+ err = rtc_valid_tm(&alarm.time);
+ if (err < 0)
+ return err;
+ rtc_tm_to_time(&alarm.time, &then);
+
+ /* alarm may need to wrap into tomorrow */
+ if (then < now) {
+ rtc_time_to_tm(now + 24 * 60 * 60, &tm);
+ alarm.time.tm_mday = tm.tm_mday;
+ alarm.time.tm_mon = tm.tm_mon;
+ alarm.time.tm_year = tm.tm_year;
+ }
+ }
+
+ err = rtc_set_alarm(rtc, &alarm);
break;
case RTC_RD_TIME:
- err = rtc_read_time(class_dev, &tm);
+ err = rtc_read_time(rtc, &tm);
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);
+ err = rtc_set_time(rtc, &tm);
break;
+
+ case RTC_IRQP_READ:
+ if (ops->irq_set_freq)
+ err = put_user(rtc->irq_freq, (unsigned long __user *)uarg);
+ break;
+
+ case RTC_IRQP_SET:
+ if (ops->irq_set_freq)
+ err = rtc_irq_set_freq(rtc, 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
if (copy_from_user(&alarm, uarg, sizeof(alarm)))
return -EFAULT;
- err = rtc_set_alarm(class_dev, &alarm);
+ err = rtc_set_alarm(rtc, &alarm);
break;
case RTC_WKALM_RD:
- err = rtc_read_alarm(class_dev, &alarm);
+ err = rtc_read_alarm(rtc, &alarm);
if (err < 0)
return err;
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 = -EINVAL;
+ 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);
+ rtc->ops->release(rtc->dev.parent);
mutex_unlock(&rtc->char_lock);
return 0;
return fasync_helper(fd, file, on, &rtc->async_queue);
}
-static struct file_operations rtc_dev_fops = {
+static const struct file_operations rtc_dev_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.read = rtc_dev_read,
/* insertion/removal hooks */
-static int rtc_dev_add_device(struct class_device *class_dev,
- struct class_interface *class_intf)
+void rtc_dev_prepare(struct rtc_device *rtc)
{
- int err = 0;
- struct rtc_device *rtc = to_rtc_device(class_dev);
+ if (!rtc_devt)
+ return;
if (rtc->id >= RTC_DEV_MAX) {
- dev_err(class_dev->dev, "too many RTCs\n");
- return -EINVAL;
+ pr_debug("%s: too many RTC devices\n", rtc->name);
+ return;
}
+ rtc->dev.devt = MKDEV(MAJOR(rtc_devt), rtc->id);
+
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",
+void rtc_dev_add_device(struct rtc_device *rtc)
+{
+ if (cdev_add(&rtc->char_dev, rtc->dev.devt, 1))
+ printk(KERN_WARNING "%s: failed to add char device %d:%d\n",
+ rtc->name, MAJOR(rtc_devt), rtc->id);
+ else
+ pr_debug("%s: dev (%d:%d)\n", rtc->name,
MAJOR(rtc_devt), rtc->id);
- return -ENODEV;
- }
-
- rtc->rtc_dev = class_device_create(rtc_dev_class, NULL,
- MKDEV(MAJOR(rtc_devt), rtc->id),
- class_dev->dev, "rtc%d", rtc->id);
- if (IS_ERR(rtc->rtc_dev)) {
- dev_err(class_dev->dev, "cannot create rtc_dev device\n");
- err = PTR_ERR(rtc->rtc_dev);
- goto err_cdev_del;
- }
-
- dev_info(class_dev->dev, "rtc intf: dev (%d:%d)\n",
- MAJOR(rtc->rtc_dev->devt),
- MINOR(rtc->rtc_dev->devt));
-
- return 0;
-
-err_cdev_del:
-
- cdev_del(&rtc->char_dev);
- return err;
}
-static void rtc_dev_remove_device(struct class_device *class_dev,
- struct class_interface *class_intf)
+void rtc_dev_del_device(struct rtc_device *rtc)
{
- struct rtc_device *rtc = to_rtc_device(class_dev);
-
- if (rtc->rtc_dev) {
- dev_dbg(class_dev->dev, "removing char %d:%d\n",
- MAJOR(rtc->rtc_dev->devt),
- MINOR(rtc->rtc_dev->devt));
-
- class_device_unregister(rtc->rtc_dev);
+ if (rtc->dev.devt)
cdev_del(&rtc->char_dev);
- }
}
-/* interface registration */
-
-static struct class_interface rtc_dev_interface = {
- .add = &rtc_dev_add_device,
- .remove = &rtc_dev_remove_device,
-};
-
-static int __init rtc_dev_init(void)
+void __init rtc_dev_init(void)
{
int err;
- rtc_dev_class = class_create(THIS_MODULE, "rtc-dev");
- if (IS_ERR(rtc_dev_class))
- return PTR_ERR(rtc_dev_class);
-
err = alloc_chrdev_region(&rtc_devt, 0, RTC_DEV_MAX, "rtc");
- if (err < 0) {
+ if (err < 0)
printk(KERN_ERR "%s: failed to allocate char dev region\n",
__FILE__);
- goto err_destroy_class;
- }
-
- err = rtc_interface_register(&rtc_dev_interface);
- if (err < 0) {
- printk(KERN_ERR "%s: failed to register the interface\n",
- __FILE__);
- goto err_unregister_chrdev;
- }
-
- return 0;
-
-err_unregister_chrdev:
- unregister_chrdev_region(rtc_devt, RTC_DEV_MAX);
-
-err_destroy_class:
- class_destroy(rtc_dev_class);
-
- return err;
}
-static void __exit rtc_dev_exit(void)
+void __exit rtc_dev_exit(void)
{
- class_interface_unregister(&rtc_dev_interface);
- class_destroy(rtc_dev_class);
- unregister_chrdev_region(rtc_devt, RTC_DEV_MAX);
+ if (rtc_devt)
+ unregister_chrdev_region(rtc_devt, RTC_DEV_MAX);
}
-
-module_init(rtc_dev_init);
-module_exit(rtc_dev_exit);
-
-MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
-MODULE_DESCRIPTION("RTC class dev interface");
-MODULE_LICENSE("GPL");
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff