driver cm32183 fix int rounding error

kiram9 · kiram9 · commit 1b3cd80c35b5 · 2022-05-20T00:20:53.000Z
Previously the als output values at low lux levels
would be rounded by the intermediate calculations
eg output values at low lux were
0, 3, 7....
now, we will get lux values correctly reported
to the nearest lux.

Signed-off-by: Kieran Levin &lt;ktl@frame.work&gt;
diff --git a/driver/als_cm32183.c b/driver/als_cm32183.c
@@ -27,8 +27,9 @@ int cm32183_read_lux(int *lux, int af)
 
 	/*
 	 * lux = data * 0.016
+	 * lux = (data * 16 / 1000) * af / 10;
 	 */
-	*lux = (data * 16 / 1000) * af / 10;
+	*lux = data * af * 16 / 10000;
 
 	return EC_SUCCESS;
 }

Original file line number	Diff line number	Diff line change
`@@ -27,8 +27,9 @@ int cm32183_read_lux(int *lux, int af)`
`27`	`27`
`28`	`28`	`/*`
`29`	`29`	`* lux = data * 0.016`
	`30`	`+ * lux = (data * 16 / 1000) * af / 10;`
`30`	`31`	`*/`
`31`		`- lux = (data 16 / 1000) * af / 10;`
	`32`	`+ lux = data af * 16 / 10000;`
`32`	`33`
`33`	`34`	`return EC_SUCCESS;`
`34`	`35`	`}`