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rtc: max77686: Use ffs() to calculate tm_wday

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max77686_rtc_calculate_wday() is used to calculate the day of the week
to be filled in struct rtc_time but that function only calculates the
number of bits shifted.  So the ffs() function can be used to find the
first bit set instead of a special function.

[akpm@linux-foundation.org: add comment clarifying ffs() use]
Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Javier Martinez Canillas 2014-10-13 15:53:03 -07:00 committed by Linus Torvalds
parent ea33c31b62
commit a20cd88e20
1 changed files with 2 additions and 11 deletions
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13
drivers/rtc/rtc-max77686.c
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@ -70,16 +70,6 @@ enum MAX77686_RTC_OP {
MAX77686_RTC_READ,
};
static inline int max77686_rtc_calculate_wday(u8 shifted)
{
int counter = -1;
while (shifted) {
shifted >>= 1;
counter++;
}
return counter;
}
static void max77686_rtc_data_to_tm(u8 *data, struct rtc_time *tm,
int rtc_24hr_mode)
{
@ -93,7 +83,8 @@ static void max77686_rtc_data_to_tm(u8 *data, struct rtc_time *tm,
tm->tm_hour += 12;
}
tm->tm_wday = max77686_rtc_calculate_wday(data[RTC_WEEKDAY] & 0x7f);
/* Only a single bit is set in data[], so fls() would be equivalent */
tm->tm_wday = ffs(data[RTC_WEEKDAY] & 0x7f) - 1;
tm->tm_mday = data[RTC_DATE] & 0x1f;
tm->tm_mon = (data[RTC_MONTH] & 0x0f) - 1;
tm->tm_year = (data[RTC_YEAR] & 0x7f) + 100;