3.16.83-rc1 review patch. If anyone has any objections, please let me know.
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From: Luuk Paulussen luuk.paulussen@alliedtelesis.co.nz
commit cf3ca1877574a306c0207cbf7fdf25419d9229df upstream.
reg2volt returns the voltage that matches a given register value. Converting this back the other way with volt2reg didn't return the same register value because it used truncation instead of rounding.
This meant that values read from sysfs could not be written back to sysfs to set back the same register value.
With this change, volt2reg will return the same value for every voltage previously returned by reg2volt (for the set of possible input values)
Signed-off-by: Luuk Paulussen luuk.paulussen@alliedtelesis.co.nz Link: https://lore.kernel.org/r/20191205231659.1301-1-luuk.paulussen@alliedtelesis... Signed-off-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Ben Hutchings ben@decadent.org.uk --- drivers/hwmon/adt7475.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
--- a/drivers/hwmon/adt7475.c +++ b/drivers/hwmon/adt7475.c @@ -268,9 +268,10 @@ static inline u16 volt2reg(int channel, long reg;
if (bypass_attn & (1 << channel)) - reg = (volt * 1024) / 2250; + reg = DIV_ROUND_CLOSEST(volt * 1024, 2250); else - reg = (volt * r[1] * 1024) / ((r[0] + r[1]) * 2250); + reg = DIV_ROUND_CLOSEST(volt * r[1] * 1024, + (r[0] + r[1]) * 2250); return clamp_val(reg, 0, 1023) & (0xff << 2); }