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>

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 68549008582cea31a0a705f98d64b36030d77d37..e11c2222d9af6f08e1d217e2478bd5eb89cfd00c 100644 (file)
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1441,6 +1441,35 @@ 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

diff --git a/include/linux/regulator/consumer.h b/include/linux/regulator/consumer.h
index 976b57b6912cf5c33e7a7ac6d8c1e49d79705d15..490c5b37b6d7f02f2f25003b4e7f4d4356a4bed9 100644 (file)
--- 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,