linux/drivers/regulator/fixed-helper.c
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   1#include <linux/slab.h>
   2#include <linux/string.h>
   3#include <linux/platform_device.h>
   4#include <linux/regulator/machine.h>
   5#include <linux/regulator/fixed.h>
   6
   7struct fixed_regulator_data {
   8        struct fixed_voltage_config cfg;
   9        struct regulator_init_data init_data;
  10        struct platform_device pdev;
  11};
  12
  13static void regulator_fixed_release(struct device *dev)
  14{
  15        struct fixed_regulator_data *data = container_of(dev,
  16                        struct fixed_regulator_data, pdev.dev);
  17        kfree(data->cfg.supply_name);
  18        kfree(data);
  19}
  20
  21/**
  22 * regulator_register_fixed_name - register a no-op fixed regulator
  23 * @id: platform device id
  24 * @name: name to be used for the regulator
  25 * @supplies: consumers for this regulator
  26 * @num_supplies: number of consumers
  27 * @uv: voltage in microvolts
  28 */
  29struct platform_device *regulator_register_always_on(int id, const char *name,
  30        struct regulator_consumer_supply *supplies, int num_supplies, int uv)
  31{
  32        struct fixed_regulator_data *data;
  33
  34        data = kzalloc(sizeof(*data), GFP_KERNEL);
  35        if (!data)
  36                return NULL;
  37
  38        data->cfg.supply_name = kstrdup(name, GFP_KERNEL);
  39        if (!data->cfg.supply_name) {
  40                kfree(data);
  41                return NULL;
  42        }
  43
  44        data->cfg.microvolts = uv;
  45        data->cfg.gpio = -EINVAL;
  46        data->cfg.enabled_at_boot = 1;
  47        data->cfg.init_data = &data->init_data;
  48
  49        data->init_data.constraints.always_on = 1;
  50        data->init_data.consumer_supplies = supplies;
  51        data->init_data.num_consumer_supplies = num_supplies;
  52
  53        data->pdev.name = "reg-fixed-voltage";
  54        data->pdev.id = id;
  55        data->pdev.dev.platform_data = &data->cfg;
  56        data->pdev.dev.release = regulator_fixed_release;
  57
  58        platform_device_register(&data->pdev);
  59
  60        return &data->pdev;
  61}
  62
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