/*
- * Real Time Clock interface for Linux
+ * Real Time Clock interface for Linux
*
* Copyright (C) 1996 Paul Gortmaker
*
* has been received. If a RTC interrupt has already happened,
* it will output an unsigned long and then block. The output value
* contains the interrupt status in the low byte and the number of
- * interrupts since the last read in the remaining high bytes. The
+ * interrupts since the last read in the remaining high bytes. The
* /dev/rtc interface can also be used with the select(2) call.
*
* This program is free software; you can redistribute it and/or
#ifndef CONFIG_HPET_EMULATE_RTC
#define is_hpet_enabled() 0
-#define hpet_set_alarm_time(hrs, min, sec) 0
-#define hpet_set_periodic_freq(arg) 0
-#define hpet_mask_rtc_irq_bit(arg) 0
-#define hpet_set_rtc_irq_bit(arg) 0
-#define hpet_rtc_timer_init() do { } while (0)
-#define hpet_rtc_dropped_irq() 0
+#define hpet_set_alarm_time(hrs, min, sec) 0
+#define hpet_set_periodic_freq(arg) 0
+#define hpet_mask_rtc_irq_bit(arg) 0
+#define hpet_set_rtc_irq_bit(arg) 0
+#define hpet_rtc_timer_init() do { } while (0)
+#define hpet_rtc_dropped_irq() 0
#ifdef RTC_IRQ
static irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id)
{
static unsigned int rtc_poll(struct file *file, poll_table *wait);
#endif
-static void get_rtc_alm_time (struct rtc_time *alm_tm);
+static void get_rtc_alm_time(struct rtc_time *alm_tm);
#ifdef RTC_IRQ
static void set_rtc_irq_bit_locked(unsigned char bit);
static void mask_rtc_irq_bit_locked(unsigned char bit);
* rtc_status but before mod_timer is called, which would then reenable the
* timer (but you would need to have an awful timing before you'd trip on it)
*/
-static unsigned long rtc_status = 0; /* bitmapped status byte. */
-static unsigned long rtc_freq = 0; /* Current periodic IRQ rate */
-static unsigned long rtc_irq_data = 0; /* our output to the world */
+static unsigned long rtc_status; /* bitmapped status byte. */
+static unsigned long rtc_freq; /* Current periodic IRQ rate */
+static unsigned long rtc_irq_data; /* our output to the world */
static unsigned long rtc_max_user_freq = 64; /* > this, need CAP_SYS_RESOURCE */
#ifdef RTC_IRQ
* rtc_task_lock nests inside rtc_lock.
*/
static DEFINE_SPINLOCK(rtc_task_lock);
-static rtc_task_t *rtc_callback = NULL;
+static rtc_task_t *rtc_callback;
#endif
/*
static unsigned long epoch = 1900; /* year corresponding to 0x00 */
-static const unsigned char days_in_mo[] =
+static const unsigned char days_in_mo[] =
{0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
/*
* the last read in the remainder of rtc_irq_data.
*/
- spin_lock (&rtc_lock);
+ spin_lock(&rtc_lock);
rtc_irq_data += 0x100;
rtc_irq_data &= ~0xff;
if (is_hpet_enabled()) {
if (rtc_status & RTC_TIMER_ON)
mod_timer(&rtc_irq_timer, jiffies + HZ/rtc_freq + 2*HZ/100);
- spin_unlock (&rtc_lock);
+ spin_unlock(&rtc_lock);
/* Now do the rest of the actions */
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);
+ wake_up_interruptible(&rtc_wait);
- kill_fasync (&rtc_async_queue, SIGIO, POLL_IN);
+ kill_fasync(&rtc_async_queue, SIGIO, POLL_IN);
return IRQ_HANDLED;
}
DECLARE_WAITQUEUE(wait, current);
unsigned long data;
ssize_t retval;
-
+
if (rtc_has_irq == 0)
return -EIO;
* confusing. And no, xchg() is not the answer. */
__set_current_state(TASK_INTERRUPTIBLE);
-
- spin_lock_irq (&rtc_lock);
+
+ spin_lock_irq(&rtc_lock);
data = rtc_irq_data;
rtc_irq_data = 0;
- spin_unlock_irq (&rtc_lock);
+ spin_unlock_irq(&rtc_lock);
if (data != 0)
break;
schedule();
} while (1);
- if (count == sizeof(unsigned int))
- retval = put_user(data, (unsigned int __user *)buf) ?: sizeof(int);
- else
- retval = put_user(data, (unsigned long __user *)buf) ?: sizeof(long);
+ if (count == sizeof(unsigned int)) {
+ retval = put_user(data,
+ (unsigned int __user *)buf) ?: sizeof(int);
+ } else {
+ retval = put_user(data,
+ (unsigned long __user *)buf) ?: sizeof(long);
+ }
if (!retval)
retval = count;
out:
static int rtc_do_ioctl(unsigned int cmd, unsigned long arg, int kernel)
{
- struct rtc_time wtime;
+ struct rtc_time wtime;
#ifdef RTC_IRQ
if (rtc_has_irq == 0) {
}
case RTC_PIE_OFF: /* Mask periodic int. enab. bit */
{
- unsigned long flags; /* can be called from isr via rtc_control() */
- spin_lock_irqsave (&rtc_lock, flags);
+ /* can be called from isr via rtc_control() */
+ unsigned long flags;
+
+ spin_lock_irqsave(&rtc_lock, flags);
mask_rtc_irq_bit_locked(RTC_PIE);
if (rtc_status & RTC_TIMER_ON) {
rtc_status &= ~RTC_TIMER_ON;
del_timer(&rtc_irq_timer);
}
- spin_unlock_irqrestore (&rtc_lock, flags);
+ spin_unlock_irqrestore(&rtc_lock, flags);
+
return 0;
}
case RTC_PIE_ON: /* Allow periodic ints */
{
- unsigned long flags; /* can be called from isr via rtc_control() */
+ /* can be called from isr via rtc_control() */
+ unsigned long flags;
+
/*
* We don't really want Joe User enabling more
* than 64Hz of interrupts on a multi-user machine.
*/
if (!kernel && (rtc_freq > rtc_max_user_freq) &&
- (!capable(CAP_SYS_RESOURCE)))
+ (!capable(CAP_SYS_RESOURCE)))
return -EACCES;
- spin_lock_irqsave (&rtc_lock, flags);
+ spin_lock_irqsave(&rtc_lock, flags);
if (!(rtc_status & RTC_TIMER_ON)) {
mod_timer(&rtc_irq_timer, jiffies + HZ/rtc_freq +
2*HZ/100);
rtc_status |= RTC_TIMER_ON;
}
set_rtc_irq_bit_locked(RTC_PIE);
- spin_unlock_irqrestore (&rtc_lock, flags);
+ spin_unlock_irqrestore(&rtc_lock, flags);
+
return 0;
}
case RTC_UIE_OFF: /* Mask ints from RTC updates. */
*/
memset(&wtime, 0, sizeof(struct rtc_time));
get_rtc_alm_time(&wtime);
- break;
+ break;
}
case RTC_ALM_SET: /* Store a time into the alarm */
{
*/
}
if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) ||
- RTC_ALWAYS_BCD)
- {
- if (sec < 60) BIN_TO_BCD(sec);
- else sec = 0xff;
-
- if (min < 60) BIN_TO_BCD(min);
- else min = 0xff;
-
- if (hrs < 24) BIN_TO_BCD(hrs);
- else hrs = 0xff;
+ RTC_ALWAYS_BCD) {
+ if (sec < 60)
+ BIN_TO_BCD(sec);
+ else
+ sec = 0xff;
+
+ if (min < 60)
+ BIN_TO_BCD(min);
+ else
+ min = 0xff;
+
+ if (hrs < 24)
+ BIN_TO_BCD(hrs);
+ else
+ hrs = 0xff;
}
CMOS_WRITE(hrs, RTC_HOURS_ALARM);
CMOS_WRITE(min, RTC_MINUTES_ALARM);
if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr)))
return -EINVAL;
-
+
if ((hrs >= 24) || (min >= 60) || (sec >= 60))
return -EINVAL;
- if ((yrs -= epoch) > 255) /* They are unsigned */
+ yrs -= epoch;
+ if (yrs > 255) /* They are unsigned */
return -EINVAL;
spin_lock_irq(&rtc_lock);
{
int tmp = 0;
unsigned char val;
- unsigned long flags; /* can be called from isr via rtc_control() */
+ /* can be called from isr via rtc_control() */
+ unsigned long flags;
- /*
+ /*
* The max we can do is 8192Hz.
*/
if ((arg < 2) || (arg > 8192))
* We don't really want Joe User generating more
* than 64Hz of interrupts on a multi-user machine.
*/
- if (!kernel && (arg > rtc_max_user_freq) && (!capable(CAP_SYS_RESOURCE)))
+ if (!kernel && (arg > rtc_max_user_freq) &&
+ !capable(CAP_SYS_RESOURCE))
return -EACCES;
while (arg > (1<<tmp))
#endif
case RTC_EPOCH_READ: /* Read the epoch. */
{
- return put_user (epoch, (unsigned long __user *)arg);
+ return put_user(epoch, (unsigned long __user *)arg);
}
case RTC_EPOCH_SET: /* Set the epoch. */
{
- /*
+ /*
* There were no RTC clocks before 1900.
*/
if (arg < 1900)
default:
return -ENOTTY;
}
- return copy_to_user((void __user *)arg, &wtime, sizeof wtime) ? -EFAULT : 0;
+ return copy_to_user((void __user *)arg,
+ &wtime, sizeof wtime) ? -EFAULT : 0;
}
static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
* needed here. Or anywhere else in this driver. */
static int rtc_open(struct inode *inode, struct file *file)
{
- spin_lock_irq (&rtc_lock);
+ spin_lock_irq(&rtc_lock);
- if(rtc_status & RTC_IS_OPEN)
+ if (rtc_status & RTC_IS_OPEN)
goto out_busy;
rtc_status |= RTC_IS_OPEN;
rtc_irq_data = 0;
- spin_unlock_irq (&rtc_lock);
+ spin_unlock_irq(&rtc_lock);
return 0;
out_busy:
- spin_unlock_irq (&rtc_lock);
+ spin_unlock_irq(&rtc_lock);
return -EBUSY;
}
-static int rtc_fasync (int fd, struct file *filp, int on)
-
+static int rtc_fasync(int fd, struct file *filp, int on)
{
- return fasync_helper (fd, filp, on, &rtc_async_queue);
+ return fasync_helper(fd, filp, on, &rtc_async_queue);
}
static int rtc_release(struct inode *inode, struct file *file)
}
spin_unlock_irq(&rtc_lock);
- if (file->f_flags & FASYNC) {
- rtc_fasync (-1, file, 0);
- }
+ if (file->f_flags & FASYNC)
+ rtc_fasync(-1, file, 0);
no_irq:
#endif
- spin_lock_irq (&rtc_lock);
+ spin_lock_irq(&rtc_lock);
rtc_irq_data = 0;
rtc_status &= ~RTC_IS_OPEN;
- spin_unlock_irq (&rtc_lock);
+ spin_unlock_irq(&rtc_lock);
+
return 0;
}
poll_wait(file, &rtc_wait, wait);
- spin_lock_irq (&rtc_lock);
+ spin_lock_irq(&rtc_lock);
l = rtc_irq_data;
- spin_unlock_irq (&rtc_lock);
+ spin_unlock_irq(&rtc_lock);
if (l != 0)
return POLLIN | POLLRDNORM;
}
#endif
-/*
- * exported stuffs
- */
-
-EXPORT_SYMBOL(rtc_register);
-EXPORT_SYMBOL(rtc_unregister);
-EXPORT_SYMBOL(rtc_control);
-
int rtc_register(rtc_task_t *task)
{
#ifndef RTC_IRQ
return 0;
#endif
}
+EXPORT_SYMBOL(rtc_register);
int rtc_unregister(rtc_task_t *task)
{
return -ENXIO;
}
rtc_callback = NULL;
-
+
/* disable controls */
if (!hpet_mask_rtc_irq_bit(RTC_PIE | RTC_AIE | RTC_UIE)) {
tmp = CMOS_READ(RTC_CONTROL);
return 0;
#endif
}
+EXPORT_SYMBOL(rtc_unregister);
int rtc_control(rtc_task_t *task, unsigned int cmd, unsigned long arg)
{
return rtc_do_ioctl(cmd, arg, 1);
#endif
}
-
+EXPORT_SYMBOL(rtc_control);
/*
* The various file operations we support.
#ifdef CONFIG_PROC_FS
static const struct file_operations rtc_proc_fops = {
- .owner = THIS_MODULE,
- .open = rtc_proc_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
+ .owner = THIS_MODULE,
+ .open = rtc_proc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
};
#endif
#ifdef CONFIG_SPARC32
for_each_ebus(ebus) {
for_each_ebusdev(edev, ebus) {
- if(strcmp(edev->prom_node->name, "rtc") == 0) {
+ if (strcmp(edev->prom_node->name, "rtc") == 0) {
rtc_port = edev->resource[0].start;
rtc_irq = edev->irqs[0];
goto found;
* XXX Interrupt pin #7 in Espresso is shared between RTC and
* PCI Slot 2 INTA# (and some INTx# in Slot 1).
*/
- if (request_irq(rtc_irq, rtc_interrupt, IRQF_SHARED, "rtc", (void *)&rtc_port)) {
+ if (request_irq(rtc_irq, rtc_interrupt, IRQF_SHARED, "rtc",
+ (void *)&rtc_port)) {
rtc_has_irq = 0;
printk(KERN_ERR "rtc: cannot register IRQ %d\n", rtc_irq);
return -EIO;
rtc_int_handler_ptr = rtc_interrupt;
}
- if(request_irq(RTC_IRQ, rtc_int_handler_ptr, IRQF_DISABLED, "rtc", NULL)) {
+ if (request_irq(RTC_IRQ, rtc_int_handler_ptr, IRQF_DISABLED,
+ "rtc", NULL)) {
/* Yeah right, seeing as irq 8 doesn't even hit the bus. */
rtc_has_irq = 0;
printk(KERN_ERR "rtc: IRQ %d is not free.\n", RTC_IRQ);
rtc_release_region();
+
return -EIO;
}
hpet_rtc_timer_init();
#if defined(__alpha__) || defined(__mips__)
rtc_freq = HZ;
-
+
/* Each operating system on an Alpha uses its own epoch.
Let's try to guess which one we are using now. */
-
+
if (rtc_is_updating() != 0)
msleep(20);
-
+
spin_lock_irq(&rtc_lock);
year = CMOS_READ(RTC_YEAR);
ctrl = CMOS_READ(RTC_CONTROL);
spin_unlock_irq(&rtc_lock);
-
+
if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
BCD_TO_BIN(year); /* This should never happen... */
-
+
if (year < 20) {
epoch = 2000;
guess = "SRM (post-2000)";
#endif
}
if (guess)
- printk(KERN_INFO "rtc: %s epoch (%lu) detected\n", guess, epoch);
+ printk(KERN_INFO "rtc: %s epoch (%lu) detected\n",
+ guess, epoch);
#endif
#ifdef RTC_IRQ
if (rtc_has_irq == 0)
spin_lock_irq(&rtc_lock);
rtc_freq = 1024;
if (!hpet_set_periodic_freq(rtc_freq)) {
- /* Initialize periodic freq. to CMOS reset default, which is 1024Hz */
- CMOS_WRITE(((CMOS_READ(RTC_FREQ_SELECT) & 0xF0) | 0x06), RTC_FREQ_SELECT);
+ /*
+ * Initialize periodic frequency to CMOS reset default,
+ * which is 1024Hz
+ */
+ CMOS_WRITE(((CMOS_READ(RTC_FREQ_SELECT) & 0xF0) | 0x06),
+ RTC_FREQ_SELECT);
}
spin_unlock_irq(&rtc_lock);
no_irq2:
return 0;
}
-static void __exit rtc_exit (void)
+static void __exit rtc_exit(void)
{
cleanup_sysctl();
- remove_proc_entry ("driver/rtc", NULL);
+ remove_proc_entry("driver/rtc", NULL);
misc_deregister(&rtc_dev);
#ifdef CONFIG_SPARC32
if (rtc_has_irq)
- free_irq (rtc_irq, &rtc_port);
+ free_irq(rtc_irq, &rtc_port);
#else
rtc_release_region();
#ifdef RTC_IRQ
if (rtc_has_irq)
- free_irq (RTC_IRQ, NULL);
+ free_irq(RTC_IRQ, NULL);
#endif
#endif /* CONFIG_SPARC32 */
}
#ifdef RTC_IRQ
/*
- * At IRQ rates >= 4096Hz, an interrupt may get lost altogether.
+ * At IRQ rates >= 4096Hz, an interrupt may get lost altogether.
* (usually during an IDE disk interrupt, with IRQ unmasking off)
* Since the interrupt handler doesn't get called, the IRQ status
* byte doesn't get read, and the RTC stops generating interrupts.
* A timer is set, and will call this function if/when that happens.
* To get it out of this stalled state, we just read the status.
* At least a jiffy of interrupts (rtc_freq/HZ) will have been lost.
- * (You *really* shouldn't be trying to use a non-realtime system
+ * (You *really* shouldn't be trying to use a non-realtime system
* for something that requires a steady > 1KHz signal anyways.)
*/
{
unsigned long freq;
- spin_lock_irq (&rtc_lock);
+ spin_lock_irq(&rtc_lock);
if (hpet_rtc_dropped_irq()) {
spin_unlock_irq(&rtc_lock);
spin_unlock_irq(&rtc_lock);
- if (printk_ratelimit())
- printk(KERN_WARNING "rtc: lost some interrupts at %ldHz.\n", freq);
+ if (printk_ratelimit()) {
+ printk(KERN_WARNING "rtc: lost some interrupts at %ldHz.\n",
+ freq);
+ }
/* Now we have new data */
wake_up_interruptible(&rtc_wait);
- kill_fasync (&rtc_async_queue, SIGIO, POLL_IN);
+ kill_fasync(&rtc_async_queue, SIGIO, POLL_IN);
}
#endif
* can take just over 2ms. We wait 20ms. There is no need to
* to poll-wait (up to 1s - eeccch) for the falling edge of RTC_UIP.
* If you need to know *exactly* when a second has started, enable
- * periodic update complete interrupts, (via ioctl) and then
+ * periodic update complete interrupts, (via ioctl) and then
* immediately read /dev/rtc which will block until you get the IRQ.
* Once the read clears, read the RTC time (again via ioctl). Easy.
*/
ctrl = CMOS_READ(RTC_CONTROL);
spin_unlock_irqrestore(&rtc_lock, flags);
- if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
- {
+ if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
BCD_TO_BIN(rtc_tm->tm_sec);
BCD_TO_BIN(rtc_tm->tm_min);
BCD_TO_BIN(rtc_tm->tm_hour);
* Account for differences between how the RTC uses the values
* and how they are defined in a struct rtc_time;
*/
- if ((rtc_tm->tm_year += (epoch - 1900)) <= 69)
+ rtc_tm->tm_year += epoch - 1900;
+ if (rtc_tm->tm_year <= 69)
rtc_tm->tm_year += 100;
rtc_tm->tm_mon--;
ctrl = CMOS_READ(RTC_CONTROL);
spin_unlock_irq(&rtc_lock);
- if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
- {
+ if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
BCD_TO_BIN(alm_tm->tm_sec);
BCD_TO_BIN(alm_tm->tm_min);
BCD_TO_BIN(alm_tm->tm_hour);
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