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regulator: core: Support table based mapping in regulator_set_voltage_time_sel 

For table based mapping, we can calculate voltage difference by below equation:
abs(rdev->desc->volt_table[new_selector] - rdev->desc->volt_table[old_selector])

Thus we can make regulator_set_voltage_time_sel work for table based mapping.

regulator_set_voltage_time_sel() only supports linear or table based mapping.
In case it is misused, also warn if neither linear nor table based mapping
is used with regulator_set_voltage_time_sel().

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Axel Lin 2012-06-18 10:11:28 +08:00 committed by Mark Brown
parent 086ccd4379
commit 398715ab94
1 changed files with 25 additions and 12 deletions
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37
drivers/regulator/core.c
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@ -2296,25 +2296,38 @@ EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
* Provided with the starting and target voltage selectors, this function
* returns time in microseconds required to rise or fall to this new voltage
*
* Drivers providing uV_step in their regulator_desc and ramp_delay in
* regulation_constraints can use this as their set_voltage_time_sel()
* operation.
* Drivers providing uV_step or volt_table in their regulator_desc and
* ramp_delay in regulation_constraints can use this as their
* set_voltage_time_sel() operation.
*/
int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
unsigned int old_selector,
unsigned int new_selector)
{
if (rdev->desc->uV_step) {
if (rdev->constraints->ramp_delay)
return DIV_ROUND_UP(rdev->desc->uV_step *
abs(new_selector - old_selector),
rdev->constraints->ramp_delay * 1000);
if (rdev->desc->ramp_delay)
return DIV_ROUND_UP(rdev->desc->uV_step *
abs(new_selector - old_selector),
rdev->desc->ramp_delay * 1000);
unsigned int ramp_delay = 0;
if (rdev->constraints->ramp_delay)
ramp_delay = rdev->constraints->ramp_delay;
else if (rdev->desc->ramp_delay)
ramp_delay = rdev->desc->ramp_delay;
if (ramp_delay == 0) {
rdev_warn(rdev, "ramp_delay not set\n");
return 0;
}
if (rdev->desc->uV_step) {
return DIV_ROUND_UP(rdev->desc->uV_step *
abs(new_selector - old_selector),
ramp_delay * 1000);
} else if (rdev->desc->volt_table) {
return DIV_ROUND_UP(abs(rdev->desc->volt_table[new_selector] -
rdev->desc->volt_table[old_selector]),
ramp_delay * 1000);
} else {
rdev_warn(rdev, "Unsupported voltage mapping settings\n");
}
return 0;
}