diff options
Diffstat (limited to 'lib/linear_ranges.c')
| -rw-r--r-- | lib/linear_ranges.c | 39 |
1 files changed, 35 insertions, 4 deletions
diff --git a/lib/linear_ranges.c b/lib/linear_ranges.c index 9495ef3572b7..a1a7dfa881de 100644 --- a/lib/linear_ranges.c +++ b/lib/linear_ranges.c @@ -128,7 +128,7 @@ EXPORT_SYMBOL_GPL(linear_range_get_value_array); * @selector: address where found selector value is updated * @found: flag to indicate that given value was in the range * - * Return selector which which range value is closest match for given + * Return selector for which range value is closest match for given * input value. Value is matching if it is equal or smaller than given * value. If given value is in the range, then @found is set true. * @@ -168,11 +168,11 @@ EXPORT_SYMBOL_GPL(linear_range_get_selector_low); * @selector: address where found selector value is updated * @found: flag to indicate that given value was in the range * - * Scan array of ranges for selector which which range value matches given + * Scan array of ranges for selector for which range value matches given * input value. Value is matching if it is equal or smaller than given * value. If given value is found to be in a range scanning is stopped and * @found is set true. If a range with values smaller than given value is found - * but the range max is being smaller than given value, then the ranges + * but the range max is being smaller than given value, then the range's * biggest selector is updated to @selector but scanning ranges is continued * and @found is set to false. * @@ -209,7 +209,7 @@ EXPORT_SYMBOL_GPL(linear_range_get_selector_low_array); * @selector: address where found selector value is updated * @found: flag to indicate that given value was in the range * - * Return selector which which range value is closest match for given + * Return selector for which range value is closest match for given * input value. Value is matching if it is equal or higher than given * value. If given value is in the range, then @found is set true. * @@ -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"); |