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Commit 476c2d83 authored by Mark Brown's avatar Mark Brown Committed by Liam Girdwood
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regulator: Allow drivers to report voltages as selectors 



Since drivers already have to provide an API for translating selectors
into voltages they may as well just report the selector values directly
to the core API rather than implement the lookup themselves. The old
interface is left in place for now, but may be removed in future.

Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: default avatarLiam Girdwood <lrg@slimlogic.co.uk>
parent 1bf5a1f8

drivers/regulator/core.c

+22 −3
Original line number Diff line number Diff line
@@ -577,7 +577,9 @@ static void drms_uA_update(struct regulator_dev *rdev) 


	err = regulator_check_drms(rdev);

	if (err < 0 || !rdev->desc->ops->get_optimum_mode ||

	    !rdev->desc->ops->get_voltage || !rdev->desc->ops->set_mode)

	    (!rdev->desc->ops->get_voltage &&

	     !rdev->desc->ops->get_voltage_sel) ||

	    !rdev->desc->ops->set_mode)

		return;



	/* get output voltage */
@@ -1682,7 +1684,14 @@ EXPORT_SYMBOL_GPL(regulator_set_voltage); 


static int _regulator_get_voltage(struct regulator_dev *rdev)

{

	/* sanity check */

	int sel;



	if (rdev->desc->ops->get_voltage_sel) {

		sel = rdev->desc->ops->get_voltage_sel(rdev);

		if (sel < 0)

			return sel;

		return rdev->desc->ops->list_voltage(rdev, sel);

	}

	if (rdev->desc->ops->get_voltage)

		return rdev->desc->ops->get_voltage(rdev);

	else
@@ -2191,7 +2200,7 @@ static int add_regulator_attributes(struct regulator_dev *rdev) 
	int			status = 0;



	/* some attributes need specific methods to be displayed */

	if (ops->get_voltage) {

	if (ops->get_voltage || ops->get_voltage_sel) {

		status = device_create_file(dev, &dev_attr_microvolts);

		if (status < 0)

			return status;
@@ -2327,6 +2336,16 @@ struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, 
	if (!init_data)

		return ERR_PTR(-EINVAL);



	/* Only one of each should be implemented */

	WARN_ON(regulator_desc->ops->get_voltage &&

		regulator_desc->ops->get_voltage_sel);



	/* If we're using selectors we must implement list_voltage. */

	if (regulator_desc->ops->get_voltage_sel &&

	    !regulator_desc->ops->list_voltage) {

		return ERR_PTR(-EINVAL);

	}



	rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);

	if (rdev == NULL)

		return ERR_PTR(-ENOMEM);

include/linux/regulator/driver.h

+3 −0
Original line number Diff line number Diff line
@@ -43,6 +43,8 @@ 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.

 * @get_voltage_sel: Return the currently configured voltage selector 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
@@ -82,6 +84,7 @@ struct regulator_ops { 
	int (*set_voltage) (struct regulator_dev *, int min_uV, int max_uV,

			    unsigned *selector);

	int (*get_voltage) (struct regulator_dev *);

	int (*get_voltage_sel) (struct regulator_dev *);



	/* get/set regulator current  */

	int (*set_current_limit) (struct regulator_dev *,