1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * linux/drivers/regulator/aat2870-regulator.c
4  *
5  * Copyright (c) 2011, NVIDIA Corporation.
6  * Author: Jin Park <jinyoungp@nvidia.com>
7  */
8 
9 #include <linux/kernel.h>
10 #include <linux/init.h>
11 #include <linux/err.h>
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <linux/platform_device.h>
15 #include <linux/regulator/driver.h>
16 #include <linux/regulator/machine.h>
17 #include <linux/mfd/aat2870.h>
18 
19 struct aat2870_regulator {
20 	struct aat2870_data *aat2870;
21 	struct regulator_desc desc;
22 
23 	u8 enable_addr;
24 	u8 enable_shift;
25 	u8 enable_mask;
26 
27 	u8 voltage_addr;
28 	u8 voltage_shift;
29 	u8 voltage_mask;
30 };
31 
aat2870_ldo_set_voltage_sel(struct regulator_dev * rdev,unsigned selector)32 static int aat2870_ldo_set_voltage_sel(struct regulator_dev *rdev,
33 				       unsigned selector)
34 {
35 	struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
36 	struct aat2870_data *aat2870 = ri->aat2870;
37 
38 	return aat2870->update(aat2870, ri->voltage_addr, ri->voltage_mask,
39 			       selector << ri->voltage_shift);
40 }
41 
aat2870_ldo_get_voltage_sel(struct regulator_dev * rdev)42 static int aat2870_ldo_get_voltage_sel(struct regulator_dev *rdev)
43 {
44 	struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
45 	struct aat2870_data *aat2870 = ri->aat2870;
46 	u8 val;
47 	int ret;
48 
49 	ret = aat2870->read(aat2870, ri->voltage_addr, &val);
50 	if (ret)
51 		return ret;
52 
53 	return (val & ri->voltage_mask) >> ri->voltage_shift;
54 }
55 
aat2870_ldo_enable(struct regulator_dev * rdev)56 static int aat2870_ldo_enable(struct regulator_dev *rdev)
57 {
58 	struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
59 	struct aat2870_data *aat2870 = ri->aat2870;
60 
61 	return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask,
62 			       ri->enable_mask);
63 }
64 
aat2870_ldo_disable(struct regulator_dev * rdev)65 static int aat2870_ldo_disable(struct regulator_dev *rdev)
66 {
67 	struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
68 	struct aat2870_data *aat2870 = ri->aat2870;
69 
70 	return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask, 0);
71 }
72 
aat2870_ldo_is_enabled(struct regulator_dev * rdev)73 static int aat2870_ldo_is_enabled(struct regulator_dev *rdev)
74 {
75 	struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
76 	struct aat2870_data *aat2870 = ri->aat2870;
77 	u8 val;
78 	int ret;
79 
80 	ret = aat2870->read(aat2870, ri->enable_addr, &val);
81 	if (ret)
82 		return ret;
83 
84 	return val & ri->enable_mask ? 1 : 0;
85 }
86 
87 static const struct regulator_ops aat2870_ldo_ops = {
88 	.list_voltage = regulator_list_voltage_table,
89 	.map_voltage = regulator_map_voltage_ascend,
90 	.set_voltage_sel = aat2870_ldo_set_voltage_sel,
91 	.get_voltage_sel = aat2870_ldo_get_voltage_sel,
92 	.enable = aat2870_ldo_enable,
93 	.disable = aat2870_ldo_disable,
94 	.is_enabled = aat2870_ldo_is_enabled,
95 };
96 
97 static const unsigned int aat2870_ldo_voltages[] = {
98 	1200000, 1300000, 1500000, 1600000,
99 	1800000, 2000000, 2200000, 2500000,
100 	2600000, 2700000, 2800000, 2900000,
101 	3000000, 3100000, 3200000, 3300000,
102 };
103 
104 #define AAT2870_LDO(ids)				\
105 	{						\
106 		.desc = {				\
107 			.name = #ids,			\
108 			.id = AAT2870_ID_##ids,		\
109 			.n_voltages = ARRAY_SIZE(aat2870_ldo_voltages),	\
110 			.volt_table = aat2870_ldo_voltages, \
111 			.ops = &aat2870_ldo_ops,	\
112 			.type = REGULATOR_VOLTAGE,	\
113 			.owner = THIS_MODULE,		\
114 		},					\
115 	}
116 
117 static struct aat2870_regulator aat2870_regulators[] = {
118 	AAT2870_LDO(LDOA),
119 	AAT2870_LDO(LDOB),
120 	AAT2870_LDO(LDOC),
121 	AAT2870_LDO(LDOD),
122 };
123 
aat2870_get_regulator(int id)124 static struct aat2870_regulator *aat2870_get_regulator(int id)
125 {
126 	struct aat2870_regulator *ri = NULL;
127 	int i;
128 
129 	for (i = 0; i < ARRAY_SIZE(aat2870_regulators); i++) {
130 		ri = &aat2870_regulators[i];
131 		if (ri->desc.id == id)
132 			break;
133 	}
134 
135 	if (i == ARRAY_SIZE(aat2870_regulators))
136 		return NULL;
137 
138 	ri->enable_addr = AAT2870_LDO_EN;
139 	ri->enable_shift = id - AAT2870_ID_LDOA;
140 	ri->enable_mask = 0x1 << ri->enable_shift;
141 
142 	ri->voltage_addr = (id - AAT2870_ID_LDOA) / 2 ?
143 			   AAT2870_LDO_CD : AAT2870_LDO_AB;
144 	ri->voltage_shift = (id - AAT2870_ID_LDOA) % 2 ? 0 : 4;
145 	ri->voltage_mask = 0xF << ri->voltage_shift;
146 
147 	return ri;
148 }
149 
aat2870_regulator_probe(struct platform_device * pdev)150 static int aat2870_regulator_probe(struct platform_device *pdev)
151 {
152 	struct aat2870_regulator *ri;
153 	struct regulator_config config = { };
154 	struct regulator_dev *rdev;
155 
156 	ri = aat2870_get_regulator(pdev->id);
157 	if (!ri) {
158 		dev_err(&pdev->dev, "Invalid device ID, %d\n", pdev->id);
159 		return -EINVAL;
160 	}
161 	ri->aat2870 = dev_get_drvdata(pdev->dev.parent);
162 
163 	config.dev = &pdev->dev;
164 	config.driver_data = ri;
165 	config.init_data = dev_get_platdata(&pdev->dev);
166 
167 	rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
168 	if (IS_ERR(rdev)) {
169 		dev_err(&pdev->dev, "Failed to register regulator %s\n",
170 			ri->desc.name);
171 		return PTR_ERR(rdev);
172 	}
173 	platform_set_drvdata(pdev, rdev);
174 
175 	return 0;
176 }
177 
178 static struct platform_driver aat2870_regulator_driver = {
179 	.driver = {
180 		.name	= "aat2870-regulator",
181 	},
182 	.probe	= aat2870_regulator_probe,
183 };
184 
aat2870_regulator_init(void)185 static int __init aat2870_regulator_init(void)
186 {
187 	return platform_driver_register(&aat2870_regulator_driver);
188 }
189 subsys_initcall(aat2870_regulator_init);
190 
aat2870_regulator_exit(void)191 static void __exit aat2870_regulator_exit(void)
192 {
193 	platform_driver_unregister(&aat2870_regulator_driver);
194 }
195 module_exit(aat2870_regulator_exit);
196 
197 MODULE_DESCRIPTION("AnalogicTech AAT2870 Regulator");
198 MODULE_LICENSE("GPL");
199 MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>");
200 MODULE_ALIAS("platform:aat2870-regulator");
201