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regulator: core: Allow specific minimal selector for starting linear mapping 

Some drivers (at least 3 drivers) have such variant of linear mapping that
the first few selectors are invalid and the reset are linear mapping.
Let's support this case in core.

This patch adds linear_min_sel in struct regulator_desc,
so we can allow specific minimal selector for starting linear mapping.
Then extends regulator_[map|list]_voltage_linear() to support this feature.

Note that for selectors less than min_linear_index, we need count them to
n_voltages 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>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Axel Lin 2012-11-27 10:24:33 +08:00 committed by Mark Brown
parent 9489e9dcae
commit 33234e791d
2 changed files with 8 additions and 0 deletions
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6
drivers/regulator/core.c
View File

@ -1897,6 +1897,10 @@ int regulator_list_voltage_linear(struct regulator_dev *rdev,
{
if (selector >= rdev->desc->n_voltages)
return -EINVAL;
if (selector < rdev->desc->linear_min_sel)
return 0;
selector -= rdev->desc->linear_min_sel;
return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
}
@ -2120,6 +2124,8 @@ int regulator_map_voltage_linear(struct regulator_dev *rdev,
if (ret < 0)
return ret;
ret += rdev->desc->linear_min_sel;
/* Map back into a voltage to verify we're still in bounds */
voltage = rdev->desc->ops->list_voltage(rdev, ret);
if (voltage < min_uV || voltage > max_uV)

2
include/linux/regulator/driver.h
View File

@ -185,6 +185,7 @@ enum regulator_type {
*
* @min_uV: Voltage given by the lowest selector (if linear mapping)
* @uV_step: Voltage increase with each selector (if linear mapping)
* @linear_min_sel: Minimal selector for starting linear mapping
* @ramp_delay: Time to settle down after voltage change (unit: uV/us)
* @volt_table: Voltage mapping table (if table based mapping)
*
@ -207,6 +208,7 @@ struct regulator_desc {
unsigned int min_uV;
unsigned int uV_step;
unsigned int linear_min_sel;
unsigned int ramp_delay;
const unsigned int *volt_table;