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author | Axel Lin <axel.lin@gmail.com> | 2012-06-18 10:11:28 +0800 |
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committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-06-18 10:56:51 +0100 |
commit | 398715ab9414b3b7741c8239c254111f5016821c (patch) | |
tree | b617985059b139e4b799eb973ea75f0e829e0253 /drivers/regulator/core.c | |
parent | 086ccd4379ad6c9c7c7713ef5f61b9d12e995147 (diff) | |
download | linux-3.10-398715ab9414b3b7741c8239c254111f5016821c.tar.gz linux-3.10-398715ab9414b3b7741c8239c254111f5016821c.tar.bz2 linux-3.10-398715ab9414b3b7741c8239c254111f5016821c.zip |
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>
Diffstat (limited to 'drivers/regulator/core.c')
-rw-r--r-- | drivers/regulator/core.c | 37 |
1 files changed, 25 insertions, 12 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index b615ae6606d..73a3d874ca6 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -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; } |