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authorLinus Walleij <linus.walleij@linaro.org>2011-03-17 13:24:52 +0100
committerLiam Girdwood <lrg@slimlogic.co.uk>2011-03-26 14:15:06 +0000
commit88cd222b259d62148ab8c82398498b1a01314476 (patch)
treed7a5f1561ef8617d42536ff84310eb191d0f0115 /drivers/regulator
parent77af1b2641faf45788a0d480db94082ebee931dc (diff)
downloadop-kernel-dev-88cd222b259d62148ab8c82398498b1a01314476.zip
op-kernel-dev-88cd222b259d62148ab8c82398498b1a01314476.tar.gz
regulator: provide consumer interface for fall/rise time
This exposes the functionality for rise/fall fime when setting voltage to the consumers. Cc: Bengt Jonsson <bengt.g.jonsson@stericsson.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
Diffstat (limited to 'drivers/regulator')
-rw-r--r--drivers/regulator/core.c45
1 files changed, 45 insertions, 0 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index e7e4460..3ffc697 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1765,6 +1765,51 @@ out:
EXPORT_SYMBOL_GPL(regulator_set_voltage);
/**
+ * regulator_set_voltage_time - get raise/fall time
+ * @regulator: regulator source
+ * @old_uV: starting voltage in microvolts
+ * @new_uV: target voltage in microvolts
+ *
+ * Provided with the starting and ending voltage, this function attempts to
+ * calculate the time in microseconds required to rise or fall to this new
+ * voltage.
+ */
+int regulator_set_voltage_time(struct regulator *regulator,
+ int old_uV, int new_uV)
+{
+ struct regulator_dev *rdev = regulator->rdev;
+ struct regulator_ops *ops = rdev->desc->ops;
+ int old_sel = -1;
+ int new_sel = -1;
+ int voltage;
+ int i;
+
+ /* Currently requires operations to do this */
+ if (!ops->list_voltage || !ops->set_voltage_time_sel
+ || !rdev->desc->n_voltages)
+ return -EINVAL;
+
+ for (i = 0; i < rdev->desc->n_voltages; i++) {
+ /* We only look for exact voltage matches here */
+ voltage = regulator_list_voltage(regulator, i);
+ if (voltage < 0)
+ return -EINVAL;
+ if (voltage == 0)
+ continue;
+ if (voltage == old_uV)
+ old_sel = i;
+ if (voltage == new_uV)
+ new_sel = i;
+ }
+
+ if (old_sel < 0 || new_sel < 0)
+ return -EINVAL;
+
+ return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
+}
+EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
+
+/**
* regulator_sync_voltage - re-apply last regulator output voltage
* @regulator: regulator source
*
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