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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: Lu Baolu <baolu.lu@linux.intel.com> Signed-off-by: Mark Brown <broonie@kernel.org>
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1 changed files with 46 additions and 0 deletions
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@ -30,6 +30,9 @@
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#include <linux/of_gpio.h>
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#include <linux/regulator/of_regulator.h>
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#include <linux/regulator/machine.h>
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#include <linux/acpi.h>
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#include <linux/property.h>
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#include <linux/gpio/consumer.h>
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struct fixed_voltage_data {
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struct regulator_desc desc;
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@ -94,6 +97,44 @@ of_get_fixed_voltage_config(struct device *dev,
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return config;
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}
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/**
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* acpi_get_fixed_voltage_config - extract fixed_voltage_config structure info
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* @dev: device requesting for fixed_voltage_config
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* @desc: regulator description
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*
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* Populates fixed_voltage_config structure by extracting data through ACPI
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* interface, returns a pointer to the populated structure of NULL if memory
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* alloc fails.
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*/
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static struct fixed_voltage_config *
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acpi_get_fixed_voltage_config(struct device *dev,
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const struct regulator_desc *desc)
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{
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struct fixed_voltage_config *config;
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const char *supply_name;
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struct gpio_desc *gpiod;
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int ret;
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config = devm_kzalloc(dev, sizeof(*config), GFP_KERNEL);
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if (!config)
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return ERR_PTR(-ENOMEM);
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ret = device_property_read_string(dev, "supply-name", &supply_name);
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if (!ret)
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config->supply_name = supply_name;
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gpiod = gpiod_get(dev, "gpio", GPIOD_ASIS);
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if (IS_ERR(gpiod))
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return ERR_PTR(-ENODEV);
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config->gpio = desc_to_gpio(gpiod);
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config->enable_high = device_property_read_bool(dev,
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"enable-active-high");
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gpiod_put(gpiod);
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return config;
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}
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static struct regulator_ops fixed_voltage_ops = {
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};
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@ -114,6 +155,11 @@ static int reg_fixed_voltage_probe(struct platform_device *pdev)
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&drvdata->desc);
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if (IS_ERR(config))
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return PTR_ERR(config);
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} else if (ACPI_HANDLE(&pdev->dev)) {
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config = acpi_get_fixed_voltage_config(&pdev->dev,
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&drvdata->desc);
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if (IS_ERR(config))
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return PTR_ERR(config);
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} else {
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config = dev_get_platdata(&pdev->dev);
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}
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