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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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(id: 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(dev: pdev->dev.parent); |
162 | |
163 | config.dev = &pdev->dev; |
164 | config.driver_data = ri; |
165 | config.init_data = dev_get_platdata(dev: &pdev->dev); |
166 | |
167 | rdev = devm_regulator_register(dev: &pdev->dev, regulator_desc: &ri->desc, config: &config); |
168 | if (IS_ERR(ptr: rdev)) { |
169 | dev_err(&pdev->dev, "Failed to register regulator %s\n" , |
170 | ri->desc.name); |
171 | return PTR_ERR(ptr: rdev); |
172 | } |
173 | platform_set_drvdata(pdev, data: rdev); |
174 | |
175 | return 0; |
176 | } |
177 | |
178 | static struct platform_driver aat2870_regulator_driver = { |
179 | .driver = { |
180 | .name = "aat2870-regulator" , |
181 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
182 | }, |
183 | .probe = aat2870_regulator_probe, |
184 | }; |
185 | |
186 | static int __init aat2870_regulator_init(void) |
187 | { |
188 | return platform_driver_register(&aat2870_regulator_driver); |
189 | } |
190 | subsys_initcall(aat2870_regulator_init); |
191 | |
192 | static void __exit aat2870_regulator_exit(void) |
193 | { |
194 | platform_driver_unregister(&aat2870_regulator_driver); |
195 | } |
196 | module_exit(aat2870_regulator_exit); |
197 | |
198 | MODULE_DESCRIPTION("AnalogicTech AAT2870 Regulator" ); |
199 | MODULE_LICENSE("GPL" ); |
200 | MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>" ); |
201 | MODULE_ALIAS("platform:aat2870-regulator" ); |
202 | |