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SubjectRe: [PATCH v8 5/8] Loongson: YeeLoong: add hardware monitoring driver
Hi!

> +static int get_battery_current(void)
> +{
> + s16 value;
> +
> + value = (ec_read(REG_BAT_CURRENT_HIGH) << 8) |
> + (ec_read(REG_BAT_CURRENT_LOW));
> +
> + if (value < 0)
> + value = ~value + 1;
> +
> + return value;
> +}

What is going on here? I thought the value is already in two's
complement... Is the above equivalent of

if (value < 0)
value = -value;

? If so, why? If not, can you add a comment?
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html


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