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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 /drivers
parent5ffbd136e6c51c8d1eec7a4a0c5d2180c81aea30 (diff)
downloadlinaro-lsk-a7a1ad9066e0266c8a4357ba3dbaeebfb80f531d.tar.gz
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/regulator/core.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 68549008582..e11c2222d9a 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