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f7eb6c5e JP |
1 | /* |
2 | * linux/drivers/regulator/aat2870-regulator.c | |
3 | * | |
4 | * Copyright (c) 2011, NVIDIA Corporation. | |
5 | * Author: Jin Park <jinyoungp@nvidia.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * version 2 as published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
19 | * 02110-1301 USA | |
20 | */ | |
21 | ||
22 | #include <linux/kernel.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/err.h> | |
3a7d021b | 25 | #include <linux/module.h> |
f7eb6c5e | 26 | #include <linux/slab.h> |
f7eb6c5e JP |
27 | #include <linux/platform_device.h> |
28 | #include <linux/regulator/driver.h> | |
29 | #include <linux/regulator/machine.h> | |
30 | #include <linux/mfd/aat2870.h> | |
31 | ||
32 | struct aat2870_regulator { | |
b21bcd1a | 33 | struct aat2870_data *aat2870; |
f7eb6c5e JP |
34 | struct regulator_desc desc; |
35 | ||
f7eb6c5e JP |
36 | u8 enable_addr; |
37 | u8 enable_shift; | |
38 | u8 enable_mask; | |
39 | ||
40 | u8 voltage_addr; | |
41 | u8 voltage_shift; | |
42 | u8 voltage_mask; | |
43 | }; | |
44 | ||
f7eb6c5e JP |
45 | static int aat2870_ldo_set_voltage_sel(struct regulator_dev *rdev, |
46 | unsigned selector) | |
47 | { | |
48 | struct aat2870_regulator *ri = rdev_get_drvdata(rdev); | |
b21bcd1a | 49 | struct aat2870_data *aat2870 = ri->aat2870; |
f7eb6c5e JP |
50 | |
51 | return aat2870->update(aat2870, ri->voltage_addr, ri->voltage_mask, | |
a5228d2e | 52 | selector << ri->voltage_shift); |
f7eb6c5e JP |
53 | } |
54 | ||
55 | static int aat2870_ldo_get_voltage_sel(struct regulator_dev *rdev) | |
56 | { | |
57 | struct aat2870_regulator *ri = rdev_get_drvdata(rdev); | |
b21bcd1a | 58 | struct aat2870_data *aat2870 = ri->aat2870; |
f7eb6c5e JP |
59 | u8 val; |
60 | int ret; | |
61 | ||
62 | ret = aat2870->read(aat2870, ri->voltage_addr, &val); | |
63 | if (ret) | |
64 | return ret; | |
65 | ||
66 | return (val & ri->voltage_mask) >> ri->voltage_shift; | |
67 | } | |
68 | ||
69 | static int aat2870_ldo_enable(struct regulator_dev *rdev) | |
70 | { | |
71 | struct aat2870_regulator *ri = rdev_get_drvdata(rdev); | |
b21bcd1a | 72 | struct aat2870_data *aat2870 = ri->aat2870; |
f7eb6c5e JP |
73 | |
74 | return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask, | |
75 | ri->enable_mask); | |
76 | } | |
77 | ||
78 | static int aat2870_ldo_disable(struct regulator_dev *rdev) | |
79 | { | |
80 | struct aat2870_regulator *ri = rdev_get_drvdata(rdev); | |
b21bcd1a | 81 | struct aat2870_data *aat2870 = ri->aat2870; |
f7eb6c5e JP |
82 | |
83 | return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask, 0); | |
84 | } | |
85 | ||
86 | static int aat2870_ldo_is_enabled(struct regulator_dev *rdev) | |
87 | { | |
88 | struct aat2870_regulator *ri = rdev_get_drvdata(rdev); | |
b21bcd1a | 89 | struct aat2870_data *aat2870 = ri->aat2870; |
f7eb6c5e JP |
90 | u8 val; |
91 | int ret; | |
92 | ||
93 | ret = aat2870->read(aat2870, ri->enable_addr, &val); | |
94 | if (ret) | |
95 | return ret; | |
96 | ||
97 | return val & ri->enable_mask ? 1 : 0; | |
98 | } | |
99 | ||
100 | static struct regulator_ops aat2870_ldo_ops = { | |
4506c6d5 | 101 | .list_voltage = regulator_list_voltage_table, |
f7eb6c5e JP |
102 | .set_voltage_sel = aat2870_ldo_set_voltage_sel, |
103 | .get_voltage_sel = aat2870_ldo_get_voltage_sel, | |
104 | .enable = aat2870_ldo_enable, | |
105 | .disable = aat2870_ldo_disable, | |
106 | .is_enabled = aat2870_ldo_is_enabled, | |
107 | }; | |
108 | ||
4506c6d5 | 109 | static const unsigned int aat2870_ldo_voltages[] = { |
f7eb6c5e JP |
110 | 1200000, 1300000, 1500000, 1600000, |
111 | 1800000, 2000000, 2200000, 2500000, | |
112 | 2600000, 2700000, 2800000, 2900000, | |
113 | 3000000, 3100000, 3200000, 3300000, | |
114 | }; | |
115 | ||
116 | #define AAT2870_LDO(ids) \ | |
117 | { \ | |
118 | .desc = { \ | |
119 | .name = #ids, \ | |
120 | .id = AAT2870_ID_##ids, \ | |
121 | .n_voltages = ARRAY_SIZE(aat2870_ldo_voltages), \ | |
4506c6d5 | 122 | .volt_table = aat2870_ldo_voltages, \ |
f7eb6c5e JP |
123 | .ops = &aat2870_ldo_ops, \ |
124 | .type = REGULATOR_VOLTAGE, \ | |
125 | .owner = THIS_MODULE, \ | |
126 | }, \ | |
f7eb6c5e JP |
127 | } |
128 | ||
129 | static struct aat2870_regulator aat2870_regulators[] = { | |
130 | AAT2870_LDO(LDOA), | |
131 | AAT2870_LDO(LDOB), | |
132 | AAT2870_LDO(LDOC), | |
133 | AAT2870_LDO(LDOD), | |
134 | }; | |
135 | ||
136 | static struct aat2870_regulator *aat2870_get_regulator(int id) | |
137 | { | |
138 | struct aat2870_regulator *ri = NULL; | |
139 | int i; | |
140 | ||
141 | for (i = 0; i < ARRAY_SIZE(aat2870_regulators); i++) { | |
142 | ri = &aat2870_regulators[i]; | |
143 | if (ri->desc.id == id) | |
144 | break; | |
145 | } | |
146 | ||
d4d6373c | 147 | if (i == ARRAY_SIZE(aat2870_regulators)) |
f7eb6c5e JP |
148 | return NULL; |
149 | ||
150 | ri->enable_addr = AAT2870_LDO_EN; | |
151 | ri->enable_shift = id - AAT2870_ID_LDOA; | |
152 | ri->enable_mask = 0x1 << ri->enable_shift; | |
153 | ||
154 | ri->voltage_addr = (id - AAT2870_ID_LDOA) / 2 ? | |
155 | AAT2870_LDO_CD : AAT2870_LDO_AB; | |
156 | ri->voltage_shift = (id - AAT2870_ID_LDOA) % 2 ? 0 : 4; | |
157 | ri->voltage_mask = 0xF << ri->voltage_shift; | |
158 | ||
159 | return ri; | |
160 | } | |
161 | ||
162 | static int aat2870_regulator_probe(struct platform_device *pdev) | |
163 | { | |
164 | struct aat2870_regulator *ri; | |
e4c5288e | 165 | struct regulator_config config = { }; |
f7eb6c5e JP |
166 | struct regulator_dev *rdev; |
167 | ||
168 | ri = aat2870_get_regulator(pdev->id); | |
169 | if (!ri) { | |
170 | dev_err(&pdev->dev, "Invalid device ID, %d\n", pdev->id); | |
171 | return -EINVAL; | |
172 | } | |
b21bcd1a | 173 | ri->aat2870 = dev_get_drvdata(pdev->dev.parent); |
f7eb6c5e | 174 | |
c172708d MB |
175 | config.dev = &pdev->dev; |
176 | config.driver_data = ri; | |
177 | config.init_data = pdev->dev.platform_data; | |
178 | ||
179 | rdev = regulator_register(&ri->desc, &config); | |
f7eb6c5e JP |
180 | if (IS_ERR(rdev)) { |
181 | dev_err(&pdev->dev, "Failed to register regulator %s\n", | |
182 | ri->desc.name); | |
183 | return PTR_ERR(rdev); | |
184 | } | |
185 | platform_set_drvdata(pdev, rdev); | |
186 | ||
187 | return 0; | |
188 | } | |
189 | ||
8dc995f5 | 190 | static int aat2870_regulator_remove(struct platform_device *pdev) |
f7eb6c5e JP |
191 | { |
192 | struct regulator_dev *rdev = platform_get_drvdata(pdev); | |
193 | ||
194 | regulator_unregister(rdev); | |
195 | return 0; | |
196 | } | |
197 | ||
198 | static struct platform_driver aat2870_regulator_driver = { | |
199 | .driver = { | |
200 | .name = "aat2870-regulator", | |
201 | .owner = THIS_MODULE, | |
202 | }, | |
203 | .probe = aat2870_regulator_probe, | |
5eb9f2b9 | 204 | .remove = aat2870_regulator_remove, |
f7eb6c5e JP |
205 | }; |
206 | ||
207 | static int __init aat2870_regulator_init(void) | |
208 | { | |
209 | return platform_driver_register(&aat2870_regulator_driver); | |
210 | } | |
211 | subsys_initcall(aat2870_regulator_init); | |
212 | ||
213 | static void __exit aat2870_regulator_exit(void) | |
214 | { | |
215 | platform_driver_unregister(&aat2870_regulator_driver); | |
216 | } | |
217 | module_exit(aat2870_regulator_exit); | |
218 | ||
219 | MODULE_DESCRIPTION("AnalogicTech AAT2870 Regulator"); | |
220 | MODULE_LICENSE("GPL"); | |
221 | MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>"); | |
ad9c5ffe | 222 | MODULE_ALIAS("platform:aat2870-regulator"); |