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regulator: core: Allow drivers to set voltage mapping table in regulator_desc 

Some regulator hardware use table based mapping can set volt_table in
regulator_desc and use regulator_list_voltage_table() for their list_voltage
callback.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Axel Lin 2012-05-20 10:30:21 +08:00 committed by Mark Brown
parent f8f5701bda
commit cffc9592fd
2 changed files with 30 additions and 0 deletions
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25
drivers/regulator/core.c
View File

@ -1882,6 +1882,31 @@ int regulator_list_voltage_linear(struct regulator_dev *rdev,
}
EXPORT_SYMBOL_GPL(regulator_list_voltage_linear);
/**
* regulator_list_voltage_table - List voltages with table based mapping
*
* @rdev: Regulator device
* @selector: Selector to convert into a voltage
*
* Regulators with table based mapping between voltages and
* selectors can set volt_table in the regulator descriptor
* and then use this function as their list_voltage() operation.
*/
int regulator_list_voltage_table(struct regulator_dev *rdev,
unsigned int selector)
{
if (!rdev->desc->volt_table) {
BUG_ON(!rdev->desc->volt_table);
return -EINVAL;
}
if (selector >= rdev->desc->n_voltages)
return -EINVAL;
return rdev->desc->volt_table[selector];
}
EXPORT_SYMBOL_GPL(regulator_list_voltage_table);
/**
* regulator_list_voltage - enumerate supported voltages
* @regulator: regulator source

5
include/linux/regulator/driver.h
View File

@ -170,6 +170,7 @@ enum regulator_type {
*
* @min_uV: Voltage given by the lowest selector (if linear mapping)
* @uV_step: Voltage increase with each selector (if linear mapping)
* @volt_table: Voltage mapping table (if table based mapping)
*
* @vsel_reg: Register for selector when using regulator_regmap_X_voltage_
* @vsel_mask: Mask for register bitfield used for selector
@ -189,6 +190,8 @@ struct regulator_desc {
unsigned int min_uV;
unsigned int uV_step;
const unsigned int *volt_table;
unsigned int vsel_reg;
unsigned int vsel_mask;
unsigned int enable_reg;
@ -271,6 +274,8 @@ int regulator_mode_to_status(unsigned int);
int regulator_list_voltage_linear(struct regulator_dev *rdev,
unsigned int selector);
int regulator_list_voltage_table(struct regulator_dev *rdev,
unsigned int selector);
int regulator_map_voltage_linear(struct regulator_dev *rdev,
int min_uV, int max_uV);
int regulator_map_voltage_iterate(struct regulator_dev *rdev,