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