mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 11:19:37 +00:00
![Jingoo Han](/assets/img/avatar_default.png)
Fix the checkpatch warning as below: WARNING: Prefer netdev_err(netdev, ... then dev_err(dev, ... then pr_err(... to printk(KERN_ERR ... Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
511 lines
12 KiB
C
511 lines
12 KiB
C
/*
|
|
* RTC subsystem, dev interface
|
|
*
|
|
* Copyright (C) 2005 Tower Technologies
|
|
* Author: Alessandro Zummo <a.zummo@towertech.it>
|
|
*
|
|
* based on arch/arm/common/rtctime.c
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/rtc.h>
|
|
#include <linux/sched.h>
|
|
#include "rtc-core.h"
|
|
|
|
static dev_t rtc_devt;
|
|
|
|
#define RTC_DEV_MAX 16 /* 16 RTCs should be enough for everyone... */
|
|
|
|
static int rtc_dev_open(struct inode *inode, struct file *file)
|
|
{
|
|
int err;
|
|
struct rtc_device *rtc = container_of(inode->i_cdev,
|
|
struct rtc_device, char_dev);
|
|
const struct rtc_class_ops *ops = rtc->ops;
|
|
|
|
if (test_and_set_bit_lock(RTC_DEV_BUSY, &rtc->flags))
|
|
return -EBUSY;
|
|
|
|
file->private_data = rtc;
|
|
|
|
err = ops->open ? ops->open(rtc->dev.parent) : 0;
|
|
if (err == 0) {
|
|
spin_lock_irq(&rtc->irq_lock);
|
|
rtc->irq_data = 0;
|
|
spin_unlock_irq(&rtc->irq_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* something has gone wrong */
|
|
clear_bit_unlock(RTC_DEV_BUSY, &rtc->flags);
|
|
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);
|
|
|
|
spin_lock_irq(&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_irq(&rtc->irq_lock);
|
|
if (num)
|
|
rtc_handle_legacy_irq(rtc, num, RTC_UF);
|
|
}
|
|
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 int clear_uie(struct rtc_device *rtc)
|
|
{
|
|
spin_lock_irq(&rtc->irq_lock);
|
|
if (rtc->uie_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->uie_irq_active = 0;
|
|
}
|
|
spin_unlock_irq(&rtc->irq_lock);
|
|
return 0;
|
|
}
|
|
|
|
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->uie_irq_active) {
|
|
rtc->uie_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;
|
|
}
|
|
|
|
int rtc_dev_update_irq_enable_emul(struct rtc_device *rtc, unsigned int enabled)
|
|
{
|
|
if (enabled)
|
|
return set_uie(rtc);
|
|
else
|
|
return clear_uie(rtc);
|
|
}
|
|
EXPORT_SYMBOL(rtc_dev_update_irq_enable_emul);
|
|
|
|
#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)
|
|
{
|
|
struct rtc_device *rtc = file->private_data;
|
|
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
unsigned long data;
|
|
ssize_t ret;
|
|
|
|
if (count != sizeof(unsigned int) && count < sizeof(unsigned long))
|
|
return -EINVAL;
|
|
|
|
add_wait_queue(&rtc->irq_queue, &wait);
|
|
do {
|
|
__set_current_state(TASK_INTERRUPTIBLE);
|
|
|
|
spin_lock_irq(&rtc->irq_lock);
|
|
data = rtc->irq_data;
|
|
rtc->irq_data = 0;
|
|
spin_unlock_irq(&rtc->irq_lock);
|
|
|
|
if (data != 0) {
|
|
ret = 0;
|
|
break;
|
|
}
|
|
if (file->f_flags & O_NONBLOCK) {
|
|
ret = -EAGAIN;
|
|
break;
|
|
}
|
|
if (signal_pending(current)) {
|
|
ret = -ERESTARTSYS;
|
|
break;
|
|
}
|
|
schedule();
|
|
} while (1);
|
|
set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(&rtc->irq_queue, &wait);
|
|
|
|
if (ret == 0) {
|
|
/* Check for any data updates */
|
|
if (rtc->ops->read_callback)
|
|
data = rtc->ops->read_callback(rtc->dev.parent,
|
|
data);
|
|
|
|
if (sizeof(int) != sizeof(long) &&
|
|
count == sizeof(unsigned int))
|
|
ret = put_user(data, (unsigned int __user *)buf) ?:
|
|
sizeof(unsigned int);
|
|
else
|
|
ret = put_user(data, (unsigned long __user *)buf) ?:
|
|
sizeof(unsigned long);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static unsigned int rtc_dev_poll(struct file *file, poll_table *wait)
|
|
{
|
|
struct rtc_device *rtc = file->private_data;
|
|
unsigned long data;
|
|
|
|
poll_wait(file, &rtc->irq_queue, wait);
|
|
|
|
data = rtc->irq_data;
|
|
|
|
return (data != 0) ? (POLLIN | POLLRDNORM) : 0;
|
|
}
|
|
|
|
static long rtc_dev_ioctl(struct file *file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
int err = 0;
|
|
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;
|
|
|
|
err = mutex_lock_interruptible(&rtc->ops_lock);
|
|
if (err)
|
|
return err;
|
|
|
|
/* 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))
|
|
err = -EACCES;
|
|
break;
|
|
|
|
case RTC_IRQP_SET:
|
|
if (arg > rtc->max_user_freq && !capable(CAP_SYS_RESOURCE))
|
|
err = -EACCES;
|
|
break;
|
|
|
|
case RTC_PIE_ON:
|
|
if (rtc->irq_freq > rtc->max_user_freq &&
|
|
!capable(CAP_SYS_RESOURCE))
|
|
err = -EACCES;
|
|
break;
|
|
}
|
|
|
|
if (err)
|
|
goto done;
|
|
|
|
/*
|
|
* Drivers *SHOULD NOT* provide ioctl implementations
|
|
* for these requests. Instead, provide methods to
|
|
* support the following code, so that the RTC's main
|
|
* features are accessible without using ioctls.
|
|
*
|
|
* RTC and alarm times will be in UTC, by preference,
|
|
* but dual-booting with MS-Windows implies RTCs must
|
|
* use the local wall clock time.
|
|
*/
|
|
|
|
switch (cmd) {
|
|
case RTC_ALM_READ:
|
|
mutex_unlock(&rtc->ops_lock);
|
|
|
|
err = rtc_read_alarm(rtc, &alarm);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (copy_to_user(uarg, &alarm.time, sizeof(tm)))
|
|
err = -EFAULT;
|
|
return err;
|
|
|
|
case RTC_ALM_SET:
|
|
mutex_unlock(&rtc->ops_lock);
|
|
|
|
if (copy_from_user(&alarm.time, uarg, sizeof(tm)))
|
|
return -EFAULT;
|
|
|
|
alarm.enabled = 0;
|
|
alarm.pending = 0;
|
|
alarm.time.tm_wday = -1;
|
|
alarm.time.tm_yday = -1;
|
|
alarm.time.tm_isdst = -1;
|
|
|
|
/* 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;
|
|
}
|
|
}
|
|
|
|
return rtc_set_alarm(rtc, &alarm);
|
|
|
|
case RTC_RD_TIME:
|
|
mutex_unlock(&rtc->ops_lock);
|
|
|
|
err = rtc_read_time(rtc, &tm);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (copy_to_user(uarg, &tm, sizeof(tm)))
|
|
err = -EFAULT;
|
|
return err;
|
|
|
|
case RTC_SET_TIME:
|
|
mutex_unlock(&rtc->ops_lock);
|
|
|
|
if (copy_from_user(&tm, uarg, sizeof(tm)))
|
|
return -EFAULT;
|
|
|
|
return rtc_set_time(rtc, &tm);
|
|
|
|
case RTC_PIE_ON:
|
|
err = rtc_irq_set_state(rtc, NULL, 1);
|
|
break;
|
|
|
|
case RTC_PIE_OFF:
|
|
err = rtc_irq_set_state(rtc, NULL, 0);
|
|
break;
|
|
|
|
case RTC_AIE_ON:
|
|
mutex_unlock(&rtc->ops_lock);
|
|
return rtc_alarm_irq_enable(rtc, 1);
|
|
|
|
case RTC_AIE_OFF:
|
|
mutex_unlock(&rtc->ops_lock);
|
|
return rtc_alarm_irq_enable(rtc, 0);
|
|
|
|
case RTC_UIE_ON:
|
|
mutex_unlock(&rtc->ops_lock);
|
|
return rtc_update_irq_enable(rtc, 1);
|
|
|
|
case RTC_UIE_OFF:
|
|
mutex_unlock(&rtc->ops_lock);
|
|
return rtc_update_irq_enable(rtc, 0);
|
|
|
|
case RTC_IRQP_SET:
|
|
err = rtc_irq_set_freq(rtc, NULL, arg);
|
|
break;
|
|
|
|
case RTC_IRQP_READ:
|
|
err = put_user(rtc->irq_freq, (unsigned long __user *)uarg);
|
|
break;
|
|
|
|
case RTC_WKALM_SET:
|
|
mutex_unlock(&rtc->ops_lock);
|
|
if (copy_from_user(&alarm, uarg, sizeof(alarm)))
|
|
return -EFAULT;
|
|
|
|
return rtc_set_alarm(rtc, &alarm);
|
|
|
|
case RTC_WKALM_RD:
|
|
mutex_unlock(&rtc->ops_lock);
|
|
err = rtc_read_alarm(rtc, &alarm);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (copy_to_user(uarg, &alarm, sizeof(alarm)))
|
|
err = -EFAULT;
|
|
return err;
|
|
|
|
default:
|
|
/* Finally try the driver's ioctl interface */
|
|
if (ops->ioctl) {
|
|
err = ops->ioctl(rtc->dev.parent, cmd, arg);
|
|
if (err == -ENOIOCTLCMD)
|
|
err = -ENOTTY;
|
|
} else
|
|
err = -ENOTTY;
|
|
break;
|
|
}
|
|
|
|
done:
|
|
mutex_unlock(&rtc->ops_lock);
|
|
return err;
|
|
}
|
|
|
|
static int rtc_dev_fasync(int fd, struct file *file, int on)
|
|
{
|
|
struct rtc_device *rtc = file->private_data;
|
|
return fasync_helper(fd, file, on, &rtc->async_queue);
|
|
}
|
|
|
|
static int rtc_dev_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct rtc_device *rtc = file->private_data;
|
|
|
|
/* We shut down the repeating IRQs that userspace enabled,
|
|
* since nothing is listening to them.
|
|
* - Update (UIE) ... currently only managed through ioctls
|
|
* - Periodic (PIE) ... also used through rtc_*() interface calls
|
|
*
|
|
* Leave the alarm alone; it may be set to trigger a system wakeup
|
|
* later, or be used by kernel code, and is a one-shot event anyway.
|
|
*/
|
|
|
|
/* Keep ioctl until all drivers are converted */
|
|
rtc_dev_ioctl(file, RTC_UIE_OFF, 0);
|
|
rtc_update_irq_enable(rtc, 0);
|
|
rtc_irq_set_state(rtc, NULL, 0);
|
|
|
|
if (rtc->ops->release)
|
|
rtc->ops->release(rtc->dev.parent);
|
|
|
|
clear_bit_unlock(RTC_DEV_BUSY, &rtc->flags);
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations rtc_dev_fops = {
|
|
.owner = THIS_MODULE,
|
|
.llseek = no_llseek,
|
|
.read = rtc_dev_read,
|
|
.poll = rtc_dev_poll,
|
|
.unlocked_ioctl = rtc_dev_ioctl,
|
|
.open = rtc_dev_open,
|
|
.release = rtc_dev_release,
|
|
.fasync = rtc_dev_fasync,
|
|
};
|
|
|
|
/* insertion/removal hooks */
|
|
|
|
void rtc_dev_prepare(struct rtc_device *rtc)
|
|
{
|
|
if (!rtc_devt)
|
|
return;
|
|
|
|
if (rtc->id >= RTC_DEV_MAX) {
|
|
dev_dbg(&rtc->dev, "%s: too many RTC devices\n", rtc->name);
|
|
return;
|
|
}
|
|
|
|
rtc->dev.devt = MKDEV(MAJOR(rtc_devt), rtc->id);
|
|
|
|
#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;
|
|
}
|
|
|
|
void rtc_dev_add_device(struct rtc_device *rtc)
|
|
{
|
|
if (cdev_add(&rtc->char_dev, rtc->dev.devt, 1))
|
|
dev_warn(&rtc->dev, "%s: failed to add char device %d:%d\n",
|
|
rtc->name, MAJOR(rtc_devt), rtc->id);
|
|
else
|
|
dev_dbg(&rtc->dev, "%s: dev (%d:%d)\n", rtc->name,
|
|
MAJOR(rtc_devt), rtc->id);
|
|
}
|
|
|
|
void rtc_dev_del_device(struct rtc_device *rtc)
|
|
{
|
|
if (rtc->dev.devt)
|
|
cdev_del(&rtc->char_dev);
|
|
}
|
|
|
|
void __init rtc_dev_init(void)
|
|
{
|
|
int err;
|
|
|
|
err = alloc_chrdev_region(&rtc_devt, 0, RTC_DEV_MAX, "rtc");
|
|
if (err < 0)
|
|
pr_err("failed to allocate char dev region\n");
|
|
}
|
|
|
|
void __exit rtc_dev_exit(void)
|
|
{
|
|
if (rtc_devt)
|
|
unregister_chrdev_region(rtc_devt, RTC_DEV_MAX);
|
|
}
|