Commit e12ef7bf authored by Gene Chen's avatar Gene Chen Committed by Sebastian Reichel
Browse files

lib: add linear range get selector within 



Add linear range get selector within for choose closest selector
between minimum and maximum selector.

Signed-off-by: default avatarGene Chen <gene_chen@richtek.com>
Reviewed-by: default avatarMatti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Signed-off-by: default avatarSebastian Reichel <sebastian.reichel@collabora.com>
parent e73f0f0e

include/linux/linear_range.h

+2 −0
Original line number Diff line number Diff line
@@ -41,6 +41,8 @@ int linear_range_get_selector_low(const struct linear_range *r, 
int linear_range_get_selector_high(const struct linear_range *r,

				   unsigned int val, unsigned int *selector,

				   bool *found);

void linear_range_get_selector_within(const struct linear_range *r,

				      unsigned int val, unsigned int *selector);

int linear_range_get_selector_low_array(const struct linear_range *r,

					int ranges, unsigned int val,

					unsigned int *selector, bool *found);

lib/linear_ranges.c

+31 −0
Original line number Diff line number Diff line
@@ -241,5 +241,36 @@ int linear_range_get_selector_high(const struct linear_range *r, 
}

EXPORT_SYMBOL_GPL(linear_range_get_selector_high);



/**

 * linear_range_get_selector_within - return linear range selector for value

 * @r:		pointer to linear range where selector is looked from

 * @val:	value for which the selector is searched

 * @selector:	address where found selector value is updated

 *

 * Return selector for which range value is closest match for given

 * input value. Value is matching if it is equal or lower than given

 * value. But return maximum selector if given value is higher than

 * maximum value.

 */

void linear_range_get_selector_within(const struct linear_range *r,

				      unsigned int val, unsigned int *selector)

{

	if (r->min > val) {

		*selector = r->min_sel;

		return;

	}



	if (linear_range_get_max_value(r) < val) {

		*selector = r->max_sel;

		return;

	}



	if (r->step == 0)

		*selector = r->min_sel;

	else

		*selector = (val - r->min) / r->step + r->min_sel;

}

EXPORT_SYMBOL_GPL(linear_range_get_selector_within);



MODULE_DESCRIPTION("linear-ranges helper");

MODULE_LICENSE("GPL");