/*
- * Driver for NEC VR4100 series Real Time Clock unit.
+ * Driver for NEC VR4100 series Real Time Clock unit.
*
- * Copyright (C) 2003-2005 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
+ * Copyright (C) 2003-2006 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
-#include <linux/platform_device.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/irq.h>
-#include <linux/mc146818rtc.h>
-#include <linux/miscdevice.h>
#include <linux/module.h>
-#include <linux/poll.h>
+#include <linux/platform_device.h>
#include <linux/rtc.h>
#include <linux/spinlock.h>
#include <linux/types.h>
-#include <linux/wait.h>
#include <asm/div64.h>
#include <asm/io.h>
-#include <asm/time.h>
#include <asm/uaccess.h>
#include <asm/vr41xx/vr41xx.h>
static unsigned long epoch = 1970; /* Jan 1 1970 00:00:00 */
-static spinlock_t rtc_task_lock;
-static wait_queue_head_t rtc_wait;
-static unsigned long rtc_irq_data;
-static struct fasync_struct *rtc_async_queue;
-static rtc_task_t *rtc_callback;
+static spinlock_t rtc_lock = SPIN_LOCK_UNLOCKED;
static char rtc_name[] = "RTC";
static unsigned long periodic_frequency;
static unsigned long periodic_count;
-typedef enum {
- RTC_RELEASE,
- RTC_OPEN,
-} rtc_status_t;
-
-static rtc_status_t rtc_status;
-
-typedef enum {
- FUNCTION_RTC_IOCTL,
- FUNCTION_RTC_CONTROL,
-} rtc_callfrom_t;
-
struct resource rtc_resource[2] = {
{ .name = rtc_name,
.flags = IORESOURCE_MEM, },
static inline unsigned long read_elapsed_second(void)
{
+
unsigned long first_low, first_mid, first_high;
+
unsigned long second_low, second_mid, second_high;
do {
spin_unlock_irq(&rtc_lock);
}
-static void set_alarm(struct rtc_time *time)
+static void vr41xx_rtc_release(struct device *dev)
{
- unsigned long alarm_sec;
-
- alarm_sec = mktime(time->tm_year + 1900, time->tm_mon + 1, time->tm_mday,
- time->tm_hour, time->tm_min, time->tm_sec);
-
- spin_lock_irq(&rtc_lock);
-
- rtc1_write(ECMPLREG, (uint16_t)(alarm_sec << 15));
- rtc1_write(ECMPMREG, (uint16_t)(alarm_sec >> 1));
- rtc1_write(ECMPHREG, (uint16_t)(alarm_sec >> 17));
-
- spin_unlock_irq(&rtc_lock);
-}
-
-static void read_alarm(struct rtc_time *time)
-{
- unsigned long low, mid, high;
spin_lock_irq(&rtc_lock);
- low = rtc1_read(ECMPLREG);
- mid = rtc1_read(ECMPMREG);
- high = rtc1_read(ECMPHREG);
+ rtc1_write(ECMPLREG, 0);
+ rtc1_write(ECMPMREG, 0);
+ rtc1_write(ECMPHREG, 0);
+ rtc1_write(RTCL1LREG, 0);
+ rtc1_write(RTCL1HREG, 0);
spin_unlock_irq(&rtc_lock);
- to_tm((high << 17) | (mid << 1) | (low >> 15), time);
- time->tm_year -= 1900;
+ disable_irq(ELAPSEDTIME_IRQ);
+ disable_irq(RTCLONG1_IRQ);
}
-static void read_time(struct rtc_time *time)
+static int vr41xx_rtc_read_time(struct device *dev, struct rtc_time *time)
{
unsigned long epoch_sec, elapsed_sec;
epoch_sec = mktime(epoch, 1, 1, 0, 0, 0);
elapsed_sec = read_elapsed_second();
- to_tm(epoch_sec + elapsed_sec, time);
- time->tm_year -= 1900;
+ rtc_time_to_tm(epoch_sec + elapsed_sec, time);
+
+ return 0;
}
-static void set_time(struct rtc_time *time)
+static int vr41xx_rtc_set_time(struct device *dev, struct rtc_time *time)
{
unsigned long epoch_sec, current_sec;
time->tm_hour, time->tm_min, time->tm_sec);
write_elapsed_second(current_sec - epoch_sec);
+
+ return 0;
}
-static ssize_t rtc_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
+static int vr41xx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
{
- DECLARE_WAITQUEUE(wait, current);
- unsigned long irq_data;
- int retval = 0;
-
- if (count != sizeof(unsigned int) && count != sizeof(unsigned long))
- return -EINVAL;
-
- add_wait_queue(&rtc_wait, &wait);
-
- do {
- __set_current_state(TASK_INTERRUPTIBLE);
+ unsigned long low, mid, high;
+ struct rtc_time *time = &wkalrm->time;
- spin_lock_irq(&rtc_lock);
- irq_data = rtc_irq_data;
- rtc_irq_data = 0;
- spin_unlock_irq(&rtc_lock);
+ spin_lock_irq(&rtc_lock);
- if (irq_data != 0)
- break;
+ low = rtc1_read(ECMPLREG);
+ mid = rtc1_read(ECMPMREG);
+ high = rtc1_read(ECMPHREG);
- if (file->f_flags & O_NONBLOCK) {
- retval = -EAGAIN;
- break;
- }
+ spin_unlock_irq(&rtc_lock);
- if (signal_pending(current)) {
- retval = -ERESTARTSYS;
- break;
- }
- } while (1);
+ rtc_time_to_tm((high << 17) | (mid << 1) | (low >> 15), time);
- if (retval == 0) {
- if (count == sizeof(unsigned int)) {
- retval = put_user(irq_data, (unsigned int __user *)buf);
- if (retval == 0)
- retval = sizeof(unsigned int);
- } else {
- retval = put_user(irq_data, (unsigned long __user *)buf);
- if (retval == 0)
- retval = sizeof(unsigned long);
- }
+ return 0;
+}
- }
+static int vr41xx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
+{
+ unsigned long alarm_sec;
+ struct rtc_time *time = &wkalrm->time;
- __set_current_state(TASK_RUNNING);
- remove_wait_queue(&rtc_wait, &wait);
+ alarm_sec = mktime(time->tm_year + 1900, time->tm_mon + 1, time->tm_mday,
+ time->tm_hour, time->tm_min, time->tm_sec);
- return retval;
-}
+ spin_lock_irq(&rtc_lock);
-static unsigned int rtc_poll(struct file *file, struct poll_table_struct *table)
-{
- poll_wait(file, &rtc_wait, table);
+ rtc1_write(ECMPLREG, (uint16_t)(alarm_sec << 15));
+ rtc1_write(ECMPMREG, (uint16_t)(alarm_sec >> 1));
+ rtc1_write(ECMPHREG, (uint16_t)(alarm_sec >> 17));
- if (rtc_irq_data != 0)
- return POLLIN | POLLRDNORM;
+ spin_unlock_irq(&rtc_lock);
return 0;
}
-static int rtc_do_ioctl(unsigned int cmd, unsigned long arg, rtc_callfrom_t from)
+static int vr41xx_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
{
- struct rtc_time time;
unsigned long count;
switch (cmd) {
case RTC_PIE_OFF:
disable_irq(RTCLONG1_IRQ);
break;
- case RTC_ALM_SET:
- if (copy_from_user(&time, (struct rtc_time __user *)arg,
- sizeof(struct rtc_time)))
- return -EFAULT;
-
- set_alarm(&time);
- break;
- case RTC_ALM_READ:
- memset(&time, 0, sizeof(struct rtc_time));
- read_alarm(&time);
- break;
- case RTC_RD_TIME:
- memset(&time, 0, sizeof(struct rtc_time));
- read_time(&time);
- if (copy_to_user((void __user *)arg, &time, sizeof(struct rtc_time)))
- return -EFAULT;
- break;
- case RTC_SET_TIME:
- if (capable(CAP_SYS_TIME) == 0)
- return -EACCES;
-
- if (copy_from_user(&time, (struct rtc_time __user *)arg,
- sizeof(struct rtc_time)))
- return -EFAULT;
-
- set_time(&time);
- break;
case RTC_IRQP_READ:
return put_user(periodic_frequency, (unsigned long __user *)arg);
break;
if (arg > MAX_PERIODIC_RATE)
return -EINVAL;
- if (from == FUNCTION_RTC_IOCTL && arg > MAX_USER_PERIODIC_RATE &&
- capable(CAP_SYS_RESOURCE) == 0)
+ if (arg > MAX_USER_PERIODIC_RATE && capable(CAP_SYS_RESOURCE) == 0)
return -EACCES;
periodic_frequency = arg;
return 0;
}
-static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
- unsigned long arg)
-{
- return rtc_do_ioctl(cmd, arg, FUNCTION_RTC_IOCTL);
-}
-
-static int rtc_open(struct inode *inode, struct file *file)
-{
- spin_lock_irq(&rtc_lock);
-
- if (rtc_status == RTC_OPEN) {
- spin_unlock_irq(&rtc_lock);
- return -EBUSY;
- }
-
- rtc_status = RTC_OPEN;
- rtc_irq_data = 0;
-
- spin_unlock_irq(&rtc_lock);
-
- return 0;
-}
-
-static int rtc_release(struct inode *inode, struct file *file)
-{
- if (file->f_flags & FASYNC)
- (void)fasync_helper(-1, file, 0, &rtc_async_queue);
-
- spin_lock_irq(&rtc_lock);
-
- rtc1_write(ECMPLREG, 0);
- rtc1_write(ECMPMREG, 0);
- rtc1_write(ECMPHREG, 0);
- rtc1_write(RTCL1LREG, 0);
- rtc1_write(RTCL1HREG, 0);
-
- rtc_status = RTC_RELEASE;
-
- spin_unlock_irq(&rtc_lock);
-
- disable_irq(ELAPSEDTIME_IRQ);
- disable_irq(RTCLONG1_IRQ);
-
- return 0;
-}
-
-static int rtc_fasync(int fd, struct file *file, int on)
-{
- return fasync_helper(fd, file, on, &rtc_async_queue);
-}
-
-static struct file_operations rtc_fops = {
- .owner = THIS_MODULE,
- .llseek = no_llseek,
- .read = rtc_read,
- .poll = rtc_poll,
- .ioctl = rtc_ioctl,
- .open = rtc_open,
- .release = rtc_release,
- .fasync = rtc_fasync,
-};
-
static irqreturn_t elapsedtime_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
- spin_lock(&rtc_lock);
- rtc2_write(RTCINTREG, ELAPSEDTIME_INT);
-
- rtc_irq_data += 0x100;
- rtc_irq_data &= ~0xff;
- rtc_irq_data |= RTC_AF;
- spin_unlock(&rtc_lock);
+ struct platform_device *pdev = (struct platform_device *)dev_id;
+ struct rtc_device *rtc = platform_get_drvdata(pdev);
- spin_lock(&rtc_lock);
- if (rtc_callback)
- rtc_callback->func(rtc_callback->private_data);
- spin_unlock(&rtc_lock);
-
- wake_up_interruptible(&rtc_wait);
+ rtc2_write(RTCINTREG, ELAPSEDTIME_INT);
- kill_fasync(&rtc_async_queue, SIGIO, POLL_IN);
+ rtc_update_irq(&rtc->class_dev, 1, RTC_AF);
return IRQ_HANDLED;
}
static irqreturn_t rtclong1_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
+ struct platform_device *pdev = (struct platform_device *)dev_id;
+ struct rtc_device *rtc = platform_get_drvdata(pdev);
unsigned long count = periodic_count;
- spin_lock(&rtc_lock);
rtc2_write(RTCINTREG, RTCLONG1_INT);
rtc1_write(RTCL1LREG, count);
rtc1_write(RTCL1HREG, count >> 16);
- rtc_irq_data += 0x100;
- rtc_irq_data &= ~0xff;
- rtc_irq_data |= RTC_PF;
- spin_unlock(&rtc_lock);
-
- spin_lock(&rtc_task_lock);
- if (rtc_callback)
- rtc_callback->func(rtc_callback->private_data);
- spin_unlock(&rtc_task_lock);
-
- wake_up_interruptible(&rtc_wait);
-
- kill_fasync(&rtc_async_queue, SIGIO, POLL_IN);
+ rtc_update_irq(&rtc->class_dev, 1, RTC_PF);
return IRQ_HANDLED;
}
-int rtc_register(rtc_task_t *task)
-{
- if (task == NULL || task->func == NULL)
- return -EINVAL;
-
- spin_lock_irq(&rtc_lock);
- if (rtc_status == RTC_OPEN) {
- spin_unlock_irq(&rtc_lock);
- return -EBUSY;
- }
-
- spin_lock(&rtc_task_lock);
- if (rtc_callback != NULL) {
- spin_unlock(&rtc_task_lock);
- spin_unlock_irq(&rtc_task_lock);
- return -EBUSY;
- }
-
- rtc_callback = task;
- spin_unlock(&rtc_task_lock);
-
- rtc_status = RTC_OPEN;
-
- spin_unlock_irq(&rtc_lock);
-
- return 0;
-}
-
-EXPORT_SYMBOL_GPL(rtc_register);
-
-int rtc_unregister(rtc_task_t *task)
-{
- spin_lock_irq(&rtc_task_lock);
- if (task == NULL || rtc_callback != task) {
- spin_unlock_irq(&rtc_task_lock);
- return -ENXIO;
- }
-
- spin_lock(&rtc_lock);
-
- rtc1_write(ECMPLREG, 0);
- rtc1_write(ECMPMREG, 0);
- rtc1_write(ECMPHREG, 0);
- rtc1_write(RTCL1LREG, 0);
- rtc1_write(RTCL1HREG, 0);
-
- rtc_status = RTC_RELEASE;
-
- spin_unlock(&rtc_lock);
-
- rtc_callback = NULL;
-
- spin_unlock_irq(&rtc_task_lock);
-
- disable_irq(ELAPSEDTIME_IRQ);
- disable_irq(RTCLONG1_IRQ);
-
- return 0;
-}
-
-EXPORT_SYMBOL_GPL(rtc_unregister);
-
-int rtc_control(rtc_task_t *task, unsigned int cmd, unsigned long arg)
-{
- int retval = 0;
-
- spin_lock_irq(&rtc_task_lock);
-
- if (rtc_callback != task)
- retval = -ENXIO;
- else
- rtc_do_ioctl(cmd, arg, FUNCTION_RTC_CONTROL);
-
- spin_unlock_irq(&rtc_task_lock);
-
- return retval;
-}
-
-EXPORT_SYMBOL_GPL(rtc_control);
-
-static struct miscdevice rtc_miscdevice = {
- .minor = RTC_MINOR,
- .name = rtc_name,
- .fops = &rtc_fops,
+static struct rtc_class_ops vr41xx_rtc_ops = {
+ .release = vr41xx_rtc_release,
+ .ioctl = vr41xx_rtc_ioctl,
+ .read_time = vr41xx_rtc_read_time,
+ .set_time = vr41xx_rtc_set_time,
+ .read_alarm = vr41xx_rtc_read_alarm,
+ .set_alarm = vr41xx_rtc_set_alarm,
};
static int __devinit rtc_probe(struct platform_device *pdev)
{
+ struct rtc_device *rtc;
unsigned int irq;
int retval;
return -EBUSY;
}
- retval = misc_register(&rtc_miscdevice);
- if (retval < 0) {
+ rtc = rtc_device_register(rtc_name, &pdev->dev, &vr41xx_rtc_ops, THIS_MODULE);
+ if (IS_ERR(rtc)) {
iounmap(rtc1_base);
iounmap(rtc2_base);
rtc1_base = NULL;
rtc2_base = NULL;
- return retval;
+ return PTR_ERR(rtc);
}
spin_lock_irq(&rtc_lock);
rtc1_write(RTCL1LREG, 0);
rtc1_write(RTCL1HREG, 0);
- rtc_status = RTC_RELEASE;
- rtc_irq_data = 0;
-
spin_unlock_irq(&rtc_lock);
- init_waitqueue_head(&rtc_wait);
-
irq = ELAPSEDTIME_IRQ;
retval = request_irq(irq, elapsedtime_interrupt, SA_INTERRUPT,
- "elapsed_time", NULL);
+ "elapsed_time", pdev);
if (retval == 0) {
irq = RTCLONG1_IRQ;
retval = request_irq(irq, rtclong1_interrupt, SA_INTERRUPT,
- "rtclong1", NULL);
+ "rtclong1", pdev);
}
if (retval < 0) {
printk(KERN_ERR "rtc: IRQ%d is busy\n", irq);
+ rtc_device_unregister(rtc);
if (irq == RTCLONG1_IRQ)
free_irq(ELAPSEDTIME_IRQ, NULL);
iounmap(rtc1_base);
return retval;
}
+ platform_set_drvdata(pdev, rtc);
+
disable_irq(ELAPSEDTIME_IRQ);
disable_irq(RTCLONG1_IRQ);
- spin_lock_init(&rtc_task_lock);
-
printk(KERN_INFO "rtc: Real Time Clock of NEC VR4100 series\n");
return 0;
}
-static int __devexit rtc_remove(struct platform_device *dev)
+static int __devexit rtc_remove(struct platform_device *pdev)
{
- int retval;
+ struct rtc_device *rtc;
- retval = misc_deregister(&rtc_miscdevice);
- if (retval < 0)
- return retval;
+ rtc = platform_get_drvdata(pdev);
+ if (rtc != NULL)
+ rtc_device_unregister(rtc);
+
+ platform_set_drvdata(pdev, NULL);
free_irq(ELAPSEDTIME_IRQ, NULL);
free_irq(RTCLONG1_IRQ, NULL);
static struct platform_device *rtc_platform_device;
-static struct platform_driver rtc_device_driver = {
+static struct platform_driver rtc_platform_driver = {
.probe = rtc_probe,
.remove = __devexit_p(rtc_remove),
.driver = {
}
rtc_platform_device = platform_device_alloc("RTC", -1);
- if (!rtc_platform_device)
+ if (rtc_platform_device == NULL)
return -ENOMEM;
retval = platform_device_add_resources(rtc_platform_device,
return retval;
}
- retval = platform_driver_register(&rtc_device_driver);
+ retval = platform_driver_register(&rtc_platform_driver);
if (retval < 0)
platform_device_unregister(rtc_platform_device);
static void __exit vr41xx_rtc_exit(void)
{
- platform_driver_unregister(&rtc_device_driver);
+ platform_driver_unregister(&rtc_platform_driver);
platform_device_unregister(rtc_platform_device);
}
projects / linux-2.6 / commitdiff