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regulator: core: Allow regulators to provide a voltage to selector mapping

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In order to allow more drivers to factor things out into data allow
drivers to provide a mapping function to convert voltages into selectors.
This allows any driver to use set_voltage_sel(). The existing mapping
based on iterating over list_voltage() is provided as an operation which
can be assigned to the new map_voltage() function though for ease of
transition it is treated as the default.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@ti.com>
This commit is contained in:
Mark Brown 2012-05-09 21:16:06 +01:00
parent 5949a7e9ab
commit e843fc4616
2 changed files with 60 additions and 28 deletions
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84
drivers/regulator/core.c
View File

@ -1967,14 +1967,54 @@ int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel)
}
EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap);
/**
* regulator_map_voltage_iterate - map_voltage() based on list_voltage()
*
* @rdev: Regulator to operate on
* @min_uV: Lower bound for voltage
* @max_uV: Upper bound for voltage
*
* Drivers implementing set_voltage_sel() and list_voltage() can use
* this as their map_voltage() operation. It will find a suitable
* voltage by calling list_voltage() until it gets something in bounds
* for the requested voltages.
*/
int regulator_map_voltage_iterate(struct regulator_dev *rdev,
int min_uV, int max_uV)
{
int best_val = INT_MAX;
int selector = 0;
int i, ret;
/* Find the smallest voltage that falls within the specified
* range.
*/
for (i = 0; i < rdev->desc->n_voltages; i++) {
ret = rdev->desc->ops->list_voltage(rdev, i);
if (ret < 0)
continue;
if (ret < best_val && ret >= min_uV && ret <= max_uV) {
best_val = ret;
selector = i;
}
}
if (best_val != INT_MAX)
return selector;
else
return -EINVAL;
}
EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate);
static int _regulator_do_set_voltage(struct regulator_dev *rdev,
int min_uV, int max_uV)
{
int ret;
int delay = 0;
int best_val;
unsigned int selector;
int old_selector = -1;
int best_val = INT_MAX;
trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
@ -1995,39 +2035,27 @@ static int _regulator_do_set_voltage(struct regulator_dev *rdev,
if (rdev->desc->ops->set_voltage) {
ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV,
&selector);
if (rdev->desc->ops->list_voltage)
best_val = rdev->desc->ops->list_voltage(rdev,
selector);
else
best_val = -1;
} else if (rdev->desc->ops->set_voltage_sel) {
int i;
selector = 0;
/* Find the smallest voltage that falls within the specified
* range.
*/
for (i = 0; i < rdev->desc->n_voltages; i++) {
ret = rdev->desc->ops->list_voltage(rdev, i);
if (ret < 0)
continue;
if (ret < best_val && ret >= min_uV && ret <= max_uV) {
best_val = ret;
selector = i;
}
}
if (best_val != INT_MAX)
ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
if (rdev->desc->ops->map_voltage)
ret = rdev->desc->ops->map_voltage(rdev, min_uV,
max_uV);
else
ret = -EINVAL;
ret = regulator_map_voltage_iterate(rdev, min_uV,
max_uV);
if (ret >= 0) {
selector = ret;
ret = rdev->desc->ops->set_voltage_sel(rdev, ret);
}
} else {
ret = -EINVAL;
}
if (rdev->desc->ops->list_voltage)
best_val = rdev->desc->ops->list_voltage(rdev, selector);
else
best_val = -1;
/* Call set_voltage_time_sel if successfully obtained old_selector */
if (ret == 0 && old_selector >= 0 &&
rdev->desc->ops->set_voltage_time_sel) {

4
include/linux/regulator/driver.h
View File

@ -46,6 +46,7 @@ enum regulator_status {
* The driver should select the voltage closest to min_uV.
* @set_voltage_sel: Set the voltage for the regulator using the specified
* selector.
* @map_voltage: Convert a voltage into a selector
* @get_voltage: Return the currently configured voltage for the regulator.
* @get_voltage_sel: Return the currently configured voltage selector for the
* regulator.
@ -91,6 +92,7 @@ struct regulator_ops {
/* get/set regulator voltage */
int (*set_voltage) (struct regulator_dev *, int min_uV, int max_uV,
unsigned *selector);
int (*map_voltage)(struct regulator_dev *, int min_uV, int max_uV);
int (*set_voltage_sel) (struct regulator_dev *, unsigned selector);
int (*get_voltage) (struct regulator_dev *);
int (*get_voltage_sel) (struct regulator_dev *);
@ -260,6 +262,8 @@ int rdev_get_id(struct regulator_dev *rdev);
int regulator_mode_to_status(unsigned int);
int regulator_map_voltage_iterate(struct regulator_dev *rdev,
int min_uV, int max_uV);
int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev);
int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel);
int regulator_is_enabled_regmap(struct regulator_dev *rdev);