1 /*
2  * Regulator driver for the Richtek RT5033
3  *
4  * Copyright (C) 2014 Samsung Electronics, Co., Ltd.
5  * Author: Beomho Seo <beomho.seo@samsung.com>
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License version 2 as
9  * published bythe Free Software Foundation.
10  */
11 
12 #include <linux/module.h>
13 #include <linux/platform_device.h>
14 #include <linux/regulator/driver.h>
15 #include <linux/mfd/rt5033.h>
16 #include <linux/mfd/rt5033-private.h>
17 #include <linux/regulator/of_regulator.h>
18 
19 static struct regulator_ops rt5033_safe_ldo_ops = {
20 	.is_enabled		= regulator_is_enabled_regmap,
21 	.enable			= regulator_enable_regmap,
22 	.disable		= regulator_disable_regmap,
23 	.list_voltage		= regulator_list_voltage_linear,
24 };
25 
26 static struct regulator_ops rt5033_buck_ops = {
27 	.is_enabled		= regulator_is_enabled_regmap,
28 	.enable			= regulator_enable_regmap,
29 	.disable		= regulator_disable_regmap,
30 	.list_voltage		= regulator_list_voltage_linear,
31 	.map_voltage		= regulator_map_voltage_linear,
32 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
33 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
34 };
35 
36 static const struct regulator_desc rt5033_supported_regulators[] = {
37 	[RT5033_BUCK] = {
38 		.name		= "BUCK",
39 		.id		= RT5033_BUCK,
40 		.ops		= &rt5033_buck_ops,
41 		.type		= REGULATOR_VOLTAGE,
42 		.owner		= THIS_MODULE,
43 		.n_voltages	= RT5033_REGULATOR_BUCK_VOLTAGE_STEP_NUM,
44 		.min_uV		= RT5033_REGULATOR_BUCK_VOLTAGE_MIN,
45 		.uV_step	= RT5033_REGULATOR_BUCK_VOLTAGE_STEP,
46 		.enable_reg	= RT5033_REG_CTRL,
47 		.enable_mask	= RT5033_CTRL_EN_BUCK_MASK,
48 		.vsel_reg	= RT5033_REG_BUCK_CTRL,
49 		.vsel_mask	= RT5033_BUCK_CTRL_MASK,
50 	},
51 	[RT5033_LDO] = {
52 		.name		= "LDO",
53 		.id		= RT5033_LDO,
54 		.ops		= &rt5033_buck_ops,
55 		.type		= REGULATOR_VOLTAGE,
56 		.owner		= THIS_MODULE,
57 		.n_voltages	= RT5033_REGULATOR_LDO_VOLTAGE_STEP_NUM,
58 		.min_uV		= RT5033_REGULATOR_LDO_VOLTAGE_MIN,
59 		.uV_step	= RT5033_REGULATOR_LDO_VOLTAGE_STEP,
60 		.enable_reg	= RT5033_REG_CTRL,
61 		.enable_mask	= RT5033_CTRL_EN_LDO_MASK,
62 		.vsel_reg	= RT5033_REG_LDO_CTRL,
63 		.vsel_mask	= RT5033_LDO_CTRL_MASK,
64 	},
65 	[RT5033_SAFE_LDO] = {
66 		.name		= "SAFE_LDO",
67 		.id		= RT5033_SAFE_LDO,
68 		.ops		= &rt5033_safe_ldo_ops,
69 		.type		= REGULATOR_VOLTAGE,
70 		.owner		= THIS_MODULE,
71 		.n_voltages	= 1,
72 		.min_uV		= RT5033_REGULATOR_SAFE_LDO_VOLTAGE,
73 		.enable_reg	= RT5033_REG_CTRL,
74 		.enable_mask	= RT5033_CTRL_EN_SAFE_LDO_MASK,
75 	},
76 };
77 
78 static int rt5033_regulator_probe(struct platform_device *pdev)
79 {
80 	struct rt5033_dev *rt5033 = dev_get_drvdata(pdev->dev.parent);
81 	int ret, i;
82 	struct regulator_config config = {};
83 
84 	config.dev = &pdev->dev;
85 	config.driver_data = rt5033;
86 
87 	for (i = 0; i < ARRAY_SIZE(rt5033_supported_regulators); i++) {
88 		struct regulator_dev *regulator;
89 
90 		config.regmap = rt5033->regmap;
91 
92 		regulator = devm_regulator_register(&pdev->dev,
93 				&rt5033_supported_regulators[i], &config);
94 		if (IS_ERR(regulator)) {
95 			ret = PTR_ERR(regulator);
96 			dev_err(&pdev->dev,
97 				"Regulator init failed %d: with error: %d\n",
98 				i, ret);
99 			return ret;
100 		}
101 	}
102 
103 	return 0;
104 }
105 
106 static const struct platform_device_id rt5033_regulator_id[] = {
107 	{ "rt5033-regulator", },
108 	{ }
109 };
110 MODULE_DEVICE_TABLE(platform, rt5033_regulator_id);
111 
112 static struct platform_driver rt5033_regulator_driver = {
113 	.driver = {
114 		.name = "rt5033-regulator",
115 	},
116 	.probe		= rt5033_regulator_probe,
117 	.id_table	= rt5033_regulator_id,
118 };
119 module_platform_driver(rt5033_regulator_driver);
120 
121 MODULE_DESCRIPTION("Richtek RT5033 Regulator driver");
122 MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
123 MODULE_LICENSE("GPL");
124