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Commit 13bed58c authored by Lu Baolu's avatar Lu Baolu Committed by Mark Brown
Browse files

regulator: fixed: add support for ACPI interface 



Add support to retrieve fixed voltage configure information through
ACPI interface. This is needed for Intel Bay Trail devices, where a
GPIO is used to control the USB vbus.

Signed-off-by: default avatarLu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent f5a6d351

drivers/regulator/fixed.c

+46 −0
Original line number Diff line number Diff line
@@ -30,6 +30,9 @@ 
#include <linux/of_gpio.h>

#include <linux/regulator/of_regulator.h>

#include <linux/regulator/machine.h>

#include <linux/acpi.h>

#include <linux/property.h>

#include <linux/gpio/consumer.h>



struct fixed_voltage_data {

	struct regulator_desc desc;
@@ -94,6 +97,44 @@ of_get_fixed_voltage_config(struct device *dev, 
	return config;

}



/**

 * acpi_get_fixed_voltage_config - extract fixed_voltage_config structure info

 * @dev: device requesting for fixed_voltage_config

 * @desc: regulator description

 *

 * Populates fixed_voltage_config structure by extracting data through ACPI

 * interface, returns a pointer to the populated structure of NULL if memory

 * alloc fails.

 */

static struct fixed_voltage_config *

acpi_get_fixed_voltage_config(struct device *dev,

			      const struct regulator_desc *desc)

{

	struct fixed_voltage_config *config;

	const char *supply_name;

	struct gpio_desc *gpiod;

	int ret;



	config = devm_kzalloc(dev, sizeof(*config), GFP_KERNEL);

	if (!config)

		return ERR_PTR(-ENOMEM);



	ret = device_property_read_string(dev, "supply-name", &supply_name);

	if (!ret)

		config->supply_name = supply_name;



	gpiod = gpiod_get(dev, "gpio", GPIOD_ASIS);

	if (IS_ERR(gpiod))

		return ERR_PTR(-ENODEV);



	config->gpio = desc_to_gpio(gpiod);

	config->enable_high = device_property_read_bool(dev,

							"enable-active-high");

	gpiod_put(gpiod);



	return config;

}



static struct regulator_ops fixed_voltage_ops = {

};
@@ -114,6 +155,11 @@ static int reg_fixed_voltage_probe(struct platform_device *pdev) 
						     &drvdata->desc);

		if (IS_ERR(config))

			return PTR_ERR(config);

	} else if (ACPI_HANDLE(&pdev->dev)) {

		config = acpi_get_fixed_voltage_config(&pdev->dev,

						       &drvdata->desc);

		if (IS_ERR(config))

			return PTR_ERR(config);

	} else {

		config = dev_get_platdata(&pdev->dev);

	}