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 
8 struct fixed_regulator_data {
9 	struct fixed_voltage_config cfg;
10 	struct regulator_init_data init_data;
11 	struct platform_device pdev;
12 };
13 
14 static 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(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 struct platform_device *regulator_register_always_on(int id, const char *name,
31 	struct regulator_consumer_supply *supplies, int num_supplies, int uv)
32 {
33 	struct fixed_regulator_data *data;
34 
35 	data = kzalloc(sizeof(*data), GFP_KERNEL);
36 	if (!data)
37 		return NULL;
38 
39 	data->cfg.supply_name = kstrdup(name, GFP_KERNEL);
40 	if (!data->cfg.supply_name) {
41 		kfree(data);
42 		return NULL;
43 	}
44 
45 	data->cfg.microvolts = uv;
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