diff options
| author | Jonathan Cameron | 2009-01-06 14:42:12 -0800 |
|---|---|---|
| committer | Linus Torvalds | 2009-01-06 15:59:24 -0800 |
| commit | 5d2a50371ddf127afa782ad3147469be8e9bd69f (patch) | |
| tree | bc7b7032512c17f493e5f656044c79c17952f517 /drivers/rtc/rtc-cmos.c | |
| parent | 2fac6674ddf3164da42a76d62f8912073d629a30 (diff) | |
rtc: move power of 2 periodic frequency check down into drivers
Move the power of 2 check on frequencies down into individual rtc drivers
This is to allow for non power of 2 real time clock periodic interrupts
such as those on the pxa27x to be found in the new pxa27x-rtc driver
Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Alessandro Zummo <a.zummo@towertech.it>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/rtc/rtc-cmos.c')
| -rw-r--r-- | drivers/rtc/rtc-cmos.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c index cf98a5d8358e..b6d35f50e404 100644 --- a/drivers/rtc/rtc-cmos.c +++ b/drivers/rtc/rtc-cmos.c @@ -35,6 +35,7 @@ #include <linux/spinlock.h> #include <linux/platform_device.h> #include <linux/mod_devicetable.h> +#include <linux/log2.h> /* this is for "generic access to PC-style RTC" using CMOS_READ/CMOS_WRITE */ #include <asm-generic/rtc.h> @@ -384,6 +385,8 @@ static int cmos_irq_set_freq(struct device *dev, int freq) if (!is_valid_irq(cmos->irq)) return -ENXIO; + if (!is_power_of_2(freq)) + return -EINVAL; /* 0 = no irqs; 1 = 2^15 Hz ... 15 = 2^0 Hz */ f = ffs(freq); if (f-- > 16) |