Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=97144c67566241db46633727f2860e6428373fe4
Commit: 97144c67566241db46633727f2860e6428373fe4
Parent: d691eb901e044065de10756ea78a5758d457c7fd
Author: David Brownell <[EMAIL PROTECTED]>
AuthorDate: Tue Oct 16 01:28:16 2007 -0700
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Tue Oct 16 09:43:13 2007 -0700
rtc_irq_set_freq() requires power-of-two and associated kerneldoc
RTC periodic IRQs are only defined to work for 2^N Hz values. This patch
moves that validity check into the infrastructure, so drivers don't need to
check it; and adds kerneldoc for the two interface functions related to
periodic IRQs. (One of which was quite mysterious until its first use was
recently checked in!)
Signed-off-by: David Brownell <[EMAIL PROTECTED]>
Cc: Alessandro Zummo <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
drivers/rtc/interface.c | 24 ++++++++++++++++++++++++
drivers/rtc/rtc-cmos.c | 8 +++-----
2 files changed, 27 insertions(+), 5 deletions(-)
diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index a43afa5..8adcab3 100644
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -12,6 +12,7 @@
*/
#include <linux/rtc.h>
+#include <linux/log2.h>
int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm)
{
@@ -236,6 +237,16 @@ void rtc_irq_unregister(struct rtc_device *rtc, struct
rtc_task *task)
}
EXPORT_SYMBOL_GPL(rtc_irq_unregister);
+/**
+ * rtc_irq_set_state - enable/disable 2^N Hz periodic IRQs
+ * @rtc: the rtc device
+ * @task: currently registered with rtc_irq_register()
+ * @enabled: true to enable periodic IRQs
+ * Context: any
+ *
+ * Note that rtc_irq_set_freq() should previously have been used to
+ * specify the desired frequency of periodic IRQ task->func() callbacks.
+ */
int rtc_irq_set_state(struct rtc_device *rtc, struct rtc_task *task, int
enabled)
{
int err = 0;
@@ -258,6 +269,16 @@ int rtc_irq_set_state(struct rtc_device *rtc, struct
rtc_task *task, int enabled
}
EXPORT_SYMBOL_GPL(rtc_irq_set_state);
+/**
+ * rtc_irq_set_freq - set 2^N Hz periodic IRQ frequency for IRQ
+ * @rtc: the rtc device
+ * @task: currently registered with rtc_irq_register()
+ * @freq: positive frequency with which task->func() will be called
+ * Context: any
+ *
+ * Note that rtc_irq_set_state() is used to enable or disable the
+ * periodic IRQs.
+ */
int rtc_irq_set_freq(struct rtc_device *rtc, struct rtc_task *task, int freq)
{
int err = 0;
@@ -266,6 +287,9 @@ int rtc_irq_set_freq(struct rtc_device *rtc, struct
rtc_task *task, int freq)
if (rtc->ops->irq_set_freq == NULL)
return -ENXIO;
+ if (!is_power_of_2(freq))
+ return -EINVAL;
+
spin_lock_irqsave(&rtc->irq_task_lock, flags);
if (rtc->irq_task != NULL && task == NULL)
err = -EBUSY;
diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
index 5d760bb..6d0c353 100644
--- a/drivers/rtc/rtc-cmos.c
+++ b/drivers/rtc/rtc-cmos.c
@@ -246,11 +246,9 @@ static int cmos_irq_set_freq(struct device *dev, int freq)
/* 0 = no irqs; 1 = 2^15 Hz ... 15 = 2^0 Hz */
f = ffs(freq);
- if (f != 0) {
- if (f-- > 16 || freq != (1 << f))
- return -EINVAL;
- f = 16 - f;
- }
+ if (f-- > 16)
+ return -EINVAL;
+ f = 16 - f;
spin_lock_irqsave(&rtc_lock, flags);
CMOS_WRITE(RTC_REF_CLCK_32KHZ | f, RTC_FREQ_SELECT);
-
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