drivers/regulator/fixed-helper.c

   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
   7 struct fixed_regulator_data {
   8         struct fixed_voltage_config cfg;
   9         struct regulator_init_data init_data;
  10         struct platform_device pdev;
  11 };
  12
  13 static 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  */
  29 struct 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 }