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_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 */ 32 struct 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 } 64