fixed-helper.c

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#include <linux/slab.h>
#include <linux/string.h>
#include <linux/platform_device.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/fixed.h>

struct fixed_regulator_data {
    struct fixed_voltage_config cfg;
    struct regulator_init_data init_data;
    struct platform_device pdev;
};

static void regulator_fixed_release(struct device *dev)
{
    struct fixed_regulator_data *data = container_of(dev,
            struct fixed_regulator_data, pdev.dev);
    kfree(data->cfg.supply_name);
    kfree(data);
}

struct platform_device *regulator_register_always_on(int id, const char *name,
    struct regulator_consumer_supply *supplies, int num_supplies, int uv)
{
    struct fixed_regulator_data *data;

    data = kzalloc(sizeof(*data), GFP_KERNEL);
    if (!data)
        return NULL;

    data->cfg.supply_name = kstrdup(name, GFP_KERNEL);
    if (!data->cfg.supply_name) {
        kfree(data);
        return NULL;
    }

    data->cfg.microvolts = uv;
    data->cfg.gpio = -EINVAL;
    data->cfg.enabled_at_boot = 1;
    data->cfg.init_data = &data->init_data;

    data->init_data.constraints.always_on = 1;
    data->init_data.consumer_supplies = supplies;
    data->init_data.num_consumer_supplies = num_supplies;

    data->pdev.name = "reg-fixed-voltage";
    data->pdev.id = id;
    data->pdev.dev.platform_data = &data->cfg;
    data->pdev.dev.release = regulator_fixed_release;

    platform_device_register(&data->pdev);

    return &data->pdev;
}