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| author | Javier Martinez Canillas <javier.martinez@collabora.co.uk> | 2014-10-13 15:53:03 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-10-14 02:18:19 +0200 |
| commit | a20cd88e20e59ce11ebca84fac769654193c51e0 (patch) | |
| tree | 608d6eece0c3e67550438a7b8a57b74ee41c519e /drivers/rtc | |
| parent | ea33c31b621e296356ab74ea0237ba7761f2287e (diff) | |
| download | linux-a20cd88e20e59ce11ebca84fac769654193c51e0.tar.gz linux-a20cd88e20e59ce11ebca84fac769654193c51e0.tar.bz2 linux-a20cd88e20e59ce11ebca84fac769654193c51e0.zip | |
rtc: max77686: Use ffs() to calculate tm_wday
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>
Diffstat (limited to 'drivers/rtc')
| -rw-r--r-- | drivers/rtc/rtc-max77686.c | 13 |
1 files changed, 2 insertions, 11 deletions
diff --git a/drivers/rtc/rtc-max77686.c b/drivers/rtc/rtc-max77686.c index b177ba199a3d..cf73e969c8cc 100644 --- a/drivers/rtc/rtc-max77686.c +++ b/drivers/rtc/rtc-max77686.c @@ -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; |