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Date: Tue, 20 Nov 2012 15:36:46 +0800
From: Axel Lin <axel.lin@...ics.com>
To: Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc: David Dajun Chen <dchen@...semi.com>,
Ashish Jangam <ashish.jangam@...tcummins.com>,
Liam Girdwood <lrg@...com>, linux-kernel@...r.kernel.org
Subject: [PATCH RFT] 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@...ics.com>
---
Hi Ashish,
I don't have this hardware to test this patch.
Can you help to review and test this patch?
Thank you,
Axel
drivers/regulator/da9055-regulator.c | 80 +++++++++++++++++++++-------------
1 file changed, 50 insertions(+), 30 deletions(-)
diff --git a/drivers/regulator/da9055-regulator.c b/drivers/regulator/da9055-regulator.c
index 79c5665..a486b19 100644
--- 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,\
--
1.7.9.5
--
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