regulator: enumerate voltages (v2)

[linux-2.6-omap-h63xx.git] / include / linux / regulator / driver.h

diff --git a/include/linux/regulator/driver.h b/include/linux/regulator/driver.h
index 0cf37bc85c41edf31ca4410e4e4cba4bf4c90b46..2255468d456f6150f1049bc6059a585c35140443 100644 (file)
--- a/include/linux/regulator/driver.h
+++ b/include/linux/regulator/driver.h
@@ -45,6 +45,10 @@ enum regulator_status {
  * @set_voltage: Set the voltage for the regulator within the range specified.
  *               The driver should select the voltage closest to min_uV.
  * @get_voltage: Return the currently configured voltage for the regulator.
+ * @list_voltage: Return one of the supported voltages, in microvolts; zero
+ *     if the selector indicates a voltage that is unusable on this system;
+ *     or negative errno.  Selectors range from zero to one less than
+ *     regulator_desc.n_voltages.  Voltages may be reported in any order.
  *
  * @set_current_limit: Configure a limit for a current-limited regulator.
  * @get_current_limit: Get the limit for a current-limited regulator.
@@ -66,6 +70,9 @@ enum regulator_status {
  */
 struct regulator_ops {
 
+       /* enumerate supported voltages */
+       int (*list_voltage) (struct regulator_dev *, unsigned selector);
+
        /* get/set regulator voltage */
        int (*set_voltage) (struct regulator_dev *, int min_uV, int max_uV);
        int (*get_voltage) (struct regulator_dev *);
@@ -124,6 +131,7 @@ enum regulator_type {
  *
  * @name: Identifying name for the regulator.
  * @id: Numerical identifier for the regulator.
+ * @n_voltages: Number of selectors available for ops.list_voltage().
  * @ops: Regulator operations table.
  * @irq: Interrupt number for the regulator.
  * @type: Indicates if the regulator is a voltage or current regulator.
@@ -132,6 +140,7 @@ enum regulator_type {
 struct regulator_desc {
        const char *name;
        int id;
+       unsigned n_voltages;
        struct regulator_ops *ops;
        int irq;
        enum regulator_type type;