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authorMark Brown <broonie@opensource.wolfsonmicro.com>2009-07-21 16:00:24 +0100
committerLiam Girdwood <lrg@slimlogic.co.uk>2009-09-22 13:32:38 +0100
commita7a1ad9066e0266c8a4357ba3dbaeebfb80f531d (patch)
tree382d5c8a17a4dd44f3193274710caae7721881f8
parent5ffbd136e6c51c8d1eec7a4a0c5d2180c81aea30 (diff)
downloadop-kernel-dev-a7a1ad9066e0266c8a4357ba3dbaeebfb80f531d.zip
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regulator: Add regulator voltage range check API
Simplify checking of support for voltage ranges by providing an API which wraps the existing count and list operations. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
-rw-r--r--drivers/regulator/core.c29
-rw-r--r--include/linux/regulator/consumer.h2
2 files changed, 31 insertions, 0 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 6854900..e11c222 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1442,6 +1442,35 @@ int regulator_list_voltage(struct regulator *regulator, unsigned selector)
EXPORT_SYMBOL_GPL(regulator_list_voltage);
/**
+ * regulator_is_supported_voltage - check if a voltage range can be supported
+ *
+ * @regulator: Regulator to check.
+ * @min_uV: Minimum required voltage in uV.
+ * @max_uV: Maximum required voltage in uV.
+ *
+ * Returns a boolean or a negative error code.
+ */
+int regulator_is_supported_voltage(struct regulator *regulator,
+ int min_uV, int max_uV)
+{
+ int i, voltages, ret;
+
+ ret = regulator_count_voltages(regulator);
+ if (ret < 0)
+ return ret;
+ voltages = ret;
+
+ for (i = 0; i < voltages; i++) {
+ ret = regulator_list_voltage(regulator, i);
+
+ if (ret >= min_uV && ret <= max_uV)
+ return 1;
+ }
+
+ return 0;
+}
+
+/**
* regulator_set_voltage - set regulator output voltage
* @regulator: regulator source
* @min_uV: Minimum required voltage in uV
diff --git a/include/linux/regulator/consumer.h b/include/linux/regulator/consumer.h
index 976b57b..490c5b3 100644
--- a/include/linux/regulator/consumer.h
+++ b/include/linux/regulator/consumer.h
@@ -146,6 +146,8 @@ void regulator_bulk_free(int num_consumers,
int regulator_count_voltages(struct regulator *regulator);
int regulator_list_voltage(struct regulator *regulator, unsigned selector);
+int regulator_is_supported_voltage(struct regulator *regulator,
+ int min_uV, int max_uV);
int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV);
int regulator_get_voltage(struct regulator *regulator);
int regulator_set_current_limit(struct regulator *regulator,
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