regulator: da9055: Properly handle voltage range that doesn't start with 0 offset

This patch implements map_voltage and list_voltage callbacks to properly handle
the case voltage range that doesn't start with 0 offset.

Now we adjust the selector in map_voltage() before calling set_voltage_sel().
And return 0 in list_voltage() for invalid selectors.

With above change, we can remove da9055_regulator_set_voltage_bits function.

One tricky part is that we need adding voffset to n_voltages.
Although for the cases "selector < voffset" are invalid, we need add voffset to
n_voltage so regulator_list_voltage() won't fail while checking the boundary for
selector before calling list_voltage callback.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Tested-by: Ashish Jangam <ashish.jangam@kpitcummins.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --git a/drivers/regulator/da9055-regulator.c b/drivers/regulator/da9055-regulator.c
index 79c56655b9b3138c5cf913e4ef67e63ea5ad4a75..121564bb54159d5247c44e06930e7e80a7729eb3 100644 (file)
--- a/drivers/regulator/da9055-regulator.c
+++ b/drivers/regulator/da9055-regulator.c
@@ -204,6 +204,41 @@ static int da9055_buck_set_current_limit(struct regulator_dev *rdev, int min_uA,
                                info->mode.mask, val << info->mode.shift);
 }
 
+static int da9055_list_voltage(struct regulator_dev *rdev, unsigned selector)
+{
+       struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
+       struct da9055_regulator_info *info = regulator->info;
+
+       if (selector >= rdev->desc->n_voltages)
+               return -EINVAL;
+
+       if (selector < info->volt.v_offset)
+               return 0;
+
+       selector -= info->volt.v_offset;
+       return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
+}
+
+static int da9055_map_voltage(struct regulator_dev *rdev, int min_uV,
+                             int max_uV)
+{
+       struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
+       struct da9055_regulator_info *info = regulator->info;
+       int sel, voltage;
+
+       if (min_uV < rdev->desc->min_uV)
+               min_uV = rdev->desc->min_uV;
+
+       sel = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
+       sel += info->volt.v_offset;
+
+       voltage = da9055_list_voltage(rdev, sel);
+       if (voltage < min_uV || voltage > max_uV)
+               return -EINVAL;
+
+       return sel;
+}
+
 static int da9055_regulator_get_voltage_sel(struct regulator_dev *rdev)
 {
        struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
@@ -238,22 +273,6 @@ static int da9055_regulator_get_voltage_sel(struct regulator_dev *rdev)
                return sel;
 }
 
-static int da9055_regulator_set_voltage_bits(struct regulator_dev *rdev,
-                                            unsigned int reg,
-                                            unsigned int selector)
-{
-       struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
-       struct da9055_regulator_info *info = regulator->info;
-
-       /* Takes care of voltage range that does not start with 0 offset. */
-       selector += info->volt.v_offset;
-
-       /* Set the voltage */
-       return da9055_reg_update(regulator->da9055, reg, info->volt.v_mask,
-                                selector);
-
-}
-
 static int da9055_regulator_set_voltage_sel(struct regulator_dev *rdev,
                                            unsigned int selector)
 {
@@ -273,8 +292,8 @@ static int da9055_regulator_set_voltage_sel(struct regulator_dev *rdev,
                        return ret;
 
                /* Set the voltage */
-               return da9055_regulator_set_voltage_bits(rdev, info->volt.reg_a,
-                                                        selector);
+               return da9055_reg_update(regulator->da9055, info->volt.reg_a,
+                                        info->volt.v_mask, selector);
        }
 
        /*
@@ -290,11 +309,11 @@ static int da9055_regulator_set_voltage_sel(struct regulator_dev *rdev,
 
        /* Set the voltage */
        if (ret == DA9055_REGUALTOR_SET_A)
-               return da9055_regulator_set_voltage_bits(rdev, info->volt.reg_a,
-                                                        selector);
+               return da9055_reg_update(regulator->da9055, info->volt.reg_a,
+                                        info->volt.v_mask, selector);
        else
-               return da9055_regulator_set_voltage_bits(rdev, info->volt.reg_b,
-                                                selector);
+               return da9055_reg_update(regulator->da9055, info->volt.reg_b,
+                                        info->volt.v_mask, selector);
 }
 
 static int da9055_regulator_set_suspend_voltage(struct regulator_dev *rdev,
@@ -312,11 +331,12 @@ static int da9055_regulator_set_suspend_voltage(struct regulator_dev *rdev,
                        return ret;
        }
 
-       ret = regulator_map_voltage_linear(rdev, uV, uV);
+       ret = da9055_map_voltage(rdev, uV, uV);
        if (ret < 0)
                return ret;
 
-       return da9055_regulator_set_voltage_bits(rdev, info->volt.reg_b, ret);
+       return da9055_reg_update(regulator->da9055, info->volt.reg_b,
+                                info->volt.v_mask, ret);
 }
 
 static int da9055_suspend_enable(struct regulator_dev *rdev)
@@ -354,8 +374,8 @@ static struct regulator_ops da9055_buck_ops = {
 
        .get_voltage_sel = da9055_regulator_get_voltage_sel,
        .set_voltage_sel = da9055_regulator_set_voltage_sel,
-       .list_voltage = regulator_list_voltage_linear,
-       .map_voltage = regulator_map_voltage_linear,
+       .list_voltage = da9055_list_voltage,
+       .map_voltage = da9055_map_voltage,
        .is_enabled = regulator_is_enabled_regmap,
        .enable = regulator_enable_regmap,
        .disable = regulator_disable_regmap,
@@ -372,8 +392,8 @@ static struct regulator_ops da9055_ldo_ops = {
 
        .get_voltage_sel = da9055_regulator_get_voltage_sel,
        .set_voltage_sel = da9055_regulator_set_voltage_sel,
-       .list_voltage = regulator_list_voltage_linear,
-       .map_voltage = regulator_map_voltage_linear,
+       .list_voltage = da9055_list_voltage,
+       .map_voltage = da9055_map_voltage,
        .is_enabled = regulator_is_enabled_regmap,
        .enable = regulator_enable_regmap,
        .disable = regulator_disable_regmap,
@@ -392,7 +412,7 @@ static struct regulator_ops da9055_ldo_ops = {
                .ops = &da9055_ldo_ops,\
                .type = REGULATOR_VOLTAGE,\
                .id = DA9055_ID_##_id,\
-               .n_voltages = (max - min) / step + 1, \
+               .n_voltages = (max - min) / step + 1 + (voffset), \
                .enable_reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
                .enable_mask = 1, \
                .min_uV = (min) * 1000,\
@@ -421,7 +441,7 @@ static struct regulator_ops da9055_ldo_ops = {
                .ops = &da9055_buck_ops,\
                .type = REGULATOR_VOLTAGE,\
                .id = DA9055_ID_##_id,\
-               .n_voltages = (max - min) / step + 1, \
+               .n_voltages = (max - min) / step + 1 + (voffset), \
                .enable_reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
                .enable_mask = 1,\
                .min_uV = (min) * 1000,\