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authorAxel Lin <axel.lin@gmail.com>2012-06-12 20:08:30 +0800
committerMark Brown <broonie@opensource.wolfsonmicro.com>2012-06-17 20:51:44 +0100
commita967fbfaca0a979fc34c1097b37d824039a709b1 (patch)
tree5c7dff65ec2d0ecab3679c9dfb88814da53dffb2 /drivers/regulator/wm8350-regulator.c
parentb4bc9ef6253578ecc71eec79a7dd423d0a282a4b (diff)
regulator: wm8350: Use wm8350_ldo_list_voltage instead of open code to verify selected voltage
Call wm8350_ldo_list_voltage() instead of open code to verify selected voltage falls within specified range. Use wm8350_ldo_list_voltage() here is less error prone. wm8350_ldo_val_to_mvolts() is only used in wm8350_ldo_list_voltage now, so remove it and move the implementation to wm8350_ldo_list_voltage(). This patch also include below small changes in wm8350_ldo_map_voltage: 1. wm8350_ldo_map_voltage() returns selector, thus rename variable mV to sel. 2. Use DIV_ROUND_UP macro to calculate selector. Signed-off-by: Axel Lin <axel.lin@gmail.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'drivers/regulator/wm8350-regulator.c')
-rw-r--r--drivers/regulator/wm8350-regulator.c52
1 files changed, 21 insertions, 31 deletions
diff --git a/drivers/regulator/wm8350-regulator.c b/drivers/regulator/wm8350-regulator.c
index 53bf3df02975..c4913be3e1b4 100644
--- a/drivers/regulator/wm8350-regulator.c
+++ b/drivers/regulator/wm8350-regulator.c
@@ -108,15 +108,6 @@ static int get_isink_val(int min_uA, int max_uA, u16 *setting)
return -EINVAL;
}
-static inline int wm8350_ldo_val_to_mvolts(unsigned int val)
-{
- if (val < 16)
- return (val * 50) + 900;
- else
- return ((val - 16) * 100) + 1800;
-
-}
-
static inline unsigned int wm8350_ldo_mvolts_to_val(int mV)
{
if (mV < 1800)
@@ -671,10 +662,22 @@ static int wm8350_ldo_set_suspend_disable(struct regulator_dev *rdev)
return 0;
}
+static int wm8350_ldo_list_voltage(struct regulator_dev *rdev,
+ unsigned selector)
+{
+ if (selector > WM8350_LDO1_VSEL_MASK)
+ return -EINVAL;
+
+ if (selector < 16)
+ return (selector * 50000) + 900000;
+ else
+ return ((selector - 16) * 100000) + 1800000;
+}
+
static int wm8350_ldo_map_voltage(struct regulator_dev *rdev, int min_uV,
int max_uV)
{
- int mV;
+ int volt, sel;
int min_mV = min_uV / 1000;
int max_mV = max_uV / 1000;
@@ -683,29 +686,16 @@ static int wm8350_ldo_map_voltage(struct regulator_dev *rdev, int min_uV,
if (max_mV < 900 || max_mV > 3300)
return -EINVAL;
- if (min_mV < 1800) {
- /* step size is 50mV < 1800mV */
- mV = (min_mV - 851) / 50;
- if (wm8350_ldo_val_to_mvolts(mV) > max_mV)
- return -EINVAL;
- BUG_ON(wm8350_ldo_val_to_mvolts(mV) < min_mV);
- } else {
- /* step size is 100mV > 1800mV */
- mV = ((min_mV - 1701) / 100) + 16;
- if (wm8350_ldo_val_to_mvolts(mV) > max_mV)
- return -EINVAL;
- BUG_ON(wm8350_ldo_val_to_mvolts(mV) < min_mV);
- }
-
- return mV;
-}
+ if (min_mV < 1800) /* step size is 50mV < 1800mV */
+ sel = DIV_ROUND_UP(min_uV - 900, 50);
+ else /* step size is 100mV > 1800mV */
+ sel = DIV_ROUND_UP(min_uV - 1800, 100) + 16;
-static int wm8350_ldo_list_voltage(struct regulator_dev *rdev,
- unsigned selector)
-{
- if (selector > WM8350_LDO1_VSEL_MASK)
+ volt = wm8350_ldo_list_voltage(rdev, sel);
+ if (volt < min_uV || volt > max_uV)
return -EINVAL;
- return wm8350_ldo_val_to_mvolts(selector) * 1000;
+
+ return sel;
}
int wm8350_dcdc_set_slot(struct wm8350 *wm8350, int dcdc, u16 start,