1// SPDX-License-Identifier: GPL-2.0
 2#include <linux/slab.h>
 3#include <linux/string.h>
 4#include <linux/platform_device.h>
 5#include <linux/regulator/machine.h>
 6#include <linux/regulator/fixed.h>
 7
 8struct fixed_regulator_data {
 9	struct fixed_voltage_config cfg;
10	struct regulator_init_data init_data;
11	struct platform_device pdev;
12};
13
14static void regulator_fixed_release(struct device *dev)
15{
16	struct fixed_regulator_data *data = container_of(dev,
17			struct fixed_regulator_data, pdev.dev);
18	kfree_const(data->cfg.supply_name);
19	kfree(data);
20}
21
22/**
23 * regulator_register_always_on - register an always-on regulator with a fixed name
24 * @id: platform device id
25 * @name: name to be used for the regulator
26 * @supplies: consumers for this regulator
27 * @num_supplies: number of consumers
28 * @uv: voltage in microvolts
29 *
30 * Return: Pointer to registered platform device, or %NULL if memory allocation fails.
31 */
32struct platform_device *regulator_register_always_on(int id, const char *name,
33	struct regulator_consumer_supply *supplies, int num_supplies, int uv)
34{
35	struct fixed_regulator_data *data;
36
37	data = kzalloc(sizeof(*data), GFP_KERNEL);
38	if (!data)
39		return NULL;
40
41	data->cfg.supply_name = kstrdup_const(name, GFP_KERNEL);
42	if (!data->cfg.supply_name) {
43		kfree(data);
44		return NULL;
45	}
46
47	data->cfg.microvolts = uv;
48	data->cfg.enabled_at_boot = 1;
49	data->cfg.init_data = &data->init_data;
50
51	data->init_data.constraints.always_on = 1;
52	data->init_data.consumer_supplies = supplies;
53	data->init_data.num_consumer_supplies = num_supplies;
54
55	data->pdev.name = "reg-fixed-voltage";
56	data->pdev.id = id;
57	data->pdev.dev.platform_data = &data->cfg;
58	data->pdev.dev.release = regulator_fixed_release;
59
60	platform_device_register(&data->pdev);
61
62	return &data->pdev;
63}