diff mbox series

[v6,1/3] lib: add linear range get selector within

Message ID 20210716094353.140536-2-gene.chen.richtek@gmail.com (mailing list archive)
State New, archived
Headers show
Series power: supply: mt6360_charger: add MT6360 charger support | expand

Commit Message

Gene Chen July 16, 2021, 9:43 a.m. UTC 
From: Gene Chen <gene_chen@richtek.com>

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

Signed-off-by: Gene Chen <gene_chen@richtek.com>
---
 include/linux/linear_range.h |  2 ++
 lib/linear_ranges.c          | 31 +++++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+)

Comments

Vaittinen, Matti July 18, 2021, 9:55 a.m. UTC | #1 
On Fri, 2021-07-16 at 17:43 +0800, Gene Chen wrote:
> From: Gene Chen <gene_chen@richtek.com>
> 
> Add linear range get selector within for choose closest selector
> between minimum and maximum selector.
> 
> Signed-off-by: Gene Chen <gene_chen@richtek.com>

I think I had this already reviewed.

Please maintain the reviewed by, acked by etc. tags when sending new
patch versions. (assuming there is no major changes). Eg, add all
relevant tags after your signed-off-by line. This helps reviewers to
see which changes are still pending for a review/ack.

Best Regards
	Matti Vaittinen
diff mbox series

Patch

diff --git a/include/linux/linear_range.h b/include/linux/linear_range.h
index 17b5943727d5..fd3d0b358f22 100644
--- a/include/linux/linear_range.h
+++ b/include/linux/linear_range.h
@@ -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);
diff --git a/lib/linear_ranges.c b/lib/linear_ranges.c
index ced5c15d3f04..a1a7dfa881de 100644
--- a/lib/linear_ranges.c
+++ b/lib/linear_ranges.c
@@ -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");