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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> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/delay.h> | |
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 { | |
33 | struct platform_device *pdev; | |
34 | struct regulator_desc desc; | |
35 | ||
36 | const int *voltages; /* uV */ | |
37 | ||
38 | int min_uV; | |
39 | int max_uV; | |
40 | ||
41 | u8 enable_addr; | |
42 | u8 enable_shift; | |
43 | u8 enable_mask; | |
44 | ||
45 | u8 voltage_addr; | |
46 | u8 voltage_shift; | |
47 | u8 voltage_mask; | |
48 | }; | |
49 | ||
50 | static int aat2870_ldo_list_voltage(struct regulator_dev *rdev, | |
51 | unsigned selector) | |
52 | { | |
53 | struct aat2870_regulator *ri = rdev_get_drvdata(rdev); | |
54 | ||
55 | return ri->voltages[selector]; | |
56 | } | |
57 | ||
58 | static int aat2870_ldo_set_voltage_sel(struct regulator_dev *rdev, | |
59 | unsigned selector) | |
60 | { | |
61 | struct aat2870_regulator *ri = rdev_get_drvdata(rdev); | |
62 | struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent); | |
63 | ||
64 | return aat2870->update(aat2870, ri->voltage_addr, ri->voltage_mask, | |
65 | (selector << ri->voltage_shift) & ri->voltage_mask); | |
66 | } | |
67 | ||
68 | static int aat2870_ldo_get_voltage_sel(struct regulator_dev *rdev) | |
69 | { | |
70 | struct aat2870_regulator *ri = rdev_get_drvdata(rdev); | |
71 | struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent); | |
72 | u8 val; | |
73 | int ret; | |
74 | ||
75 | ret = aat2870->read(aat2870, ri->voltage_addr, &val); | |
76 | if (ret) | |
77 | return ret; | |
78 | ||
79 | return (val & ri->voltage_mask) >> ri->voltage_shift; | |
80 | } | |
81 | ||
82 | static int aat2870_ldo_enable(struct regulator_dev *rdev) | |
83 | { | |
84 | struct aat2870_regulator *ri = rdev_get_drvdata(rdev); | |
85 | struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent); | |
86 | ||
87 | return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask, | |
88 | ri->enable_mask); | |
89 | } | |
90 | ||
91 | static int aat2870_ldo_disable(struct regulator_dev *rdev) | |
92 | { | |
93 | struct aat2870_regulator *ri = rdev_get_drvdata(rdev); | |
94 | struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent); | |
95 | ||
96 | return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask, 0); | |
97 | } | |
98 | ||
99 | static int aat2870_ldo_is_enabled(struct regulator_dev *rdev) | |
100 | { | |
101 | struct aat2870_regulator *ri = rdev_get_drvdata(rdev); | |
102 | struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent); | |
103 | u8 val; | |
104 | int ret; | |
105 | ||
106 | ret = aat2870->read(aat2870, ri->enable_addr, &val); | |
107 | if (ret) | |
108 | return ret; | |
109 | ||
110 | return val & ri->enable_mask ? 1 : 0; | |
111 | } | |
112 | ||
113 | static struct regulator_ops aat2870_ldo_ops = { | |
114 | .list_voltage = aat2870_ldo_list_voltage, | |
115 | .set_voltage_sel = aat2870_ldo_set_voltage_sel, | |
116 | .get_voltage_sel = aat2870_ldo_get_voltage_sel, | |
117 | .enable = aat2870_ldo_enable, | |
118 | .disable = aat2870_ldo_disable, | |
119 | .is_enabled = aat2870_ldo_is_enabled, | |
120 | }; | |
121 | ||
122 | static const int aat2870_ldo_voltages[] = { | |
123 | 1200000, 1300000, 1500000, 1600000, | |
124 | 1800000, 2000000, 2200000, 2500000, | |
125 | 2600000, 2700000, 2800000, 2900000, | |
126 | 3000000, 3100000, 3200000, 3300000, | |
127 | }; | |
128 | ||
129 | #define AAT2870_LDO(ids) \ | |
130 | { \ | |
131 | .desc = { \ | |
132 | .name = #ids, \ | |
133 | .id = AAT2870_ID_##ids, \ | |
134 | .n_voltages = ARRAY_SIZE(aat2870_ldo_voltages), \ | |
135 | .ops = &aat2870_ldo_ops, \ | |
136 | .type = REGULATOR_VOLTAGE, \ | |
137 | .owner = THIS_MODULE, \ | |
138 | }, \ | |
139 | .voltages = aat2870_ldo_voltages, \ | |
140 | .min_uV = 1200000, \ | |
141 | .max_uV = 3300000, \ | |
142 | } | |
143 | ||
144 | static struct aat2870_regulator aat2870_regulators[] = { | |
145 | AAT2870_LDO(LDOA), | |
146 | AAT2870_LDO(LDOB), | |
147 | AAT2870_LDO(LDOC), | |
148 | AAT2870_LDO(LDOD), | |
149 | }; | |
150 | ||
151 | static struct aat2870_regulator *aat2870_get_regulator(int id) | |
152 | { | |
153 | struct aat2870_regulator *ri = NULL; | |
154 | int i; | |
155 | ||
156 | for (i = 0; i < ARRAY_SIZE(aat2870_regulators); i++) { | |
157 | ri = &aat2870_regulators[i]; | |
158 | if (ri->desc.id == id) | |
159 | break; | |
160 | } | |
161 | ||
162 | if (!ri) | |
163 | return NULL; | |
164 | ||
165 | ri->enable_addr = AAT2870_LDO_EN; | |
166 | ri->enable_shift = id - AAT2870_ID_LDOA; | |
167 | ri->enable_mask = 0x1 << ri->enable_shift; | |
168 | ||
169 | ri->voltage_addr = (id - AAT2870_ID_LDOA) / 2 ? | |
170 | AAT2870_LDO_CD : AAT2870_LDO_AB; | |
171 | ri->voltage_shift = (id - AAT2870_ID_LDOA) % 2 ? 0 : 4; | |
172 | ri->voltage_mask = 0xF << ri->voltage_shift; | |
173 | ||
174 | return ri; | |
175 | } | |
176 | ||
177 | static int aat2870_regulator_probe(struct platform_device *pdev) | |
178 | { | |
179 | struct aat2870_regulator *ri; | |
180 | struct regulator_dev *rdev; | |
181 | ||
182 | ri = aat2870_get_regulator(pdev->id); | |
183 | if (!ri) { | |
184 | dev_err(&pdev->dev, "Invalid device ID, %d\n", pdev->id); | |
185 | return -EINVAL; | |
186 | } | |
187 | ri->pdev = pdev; | |
188 | ||
189 | rdev = regulator_register(&ri->desc, &pdev->dev, | |
190 | pdev->dev.platform_data, ri); | |
191 | if (IS_ERR(rdev)) { | |
192 | dev_err(&pdev->dev, "Failed to register regulator %s\n", | |
193 | ri->desc.name); | |
194 | return PTR_ERR(rdev); | |
195 | } | |
196 | platform_set_drvdata(pdev, rdev); | |
197 | ||
198 | return 0; | |
199 | } | |
200 | ||
201 | static int __devexit aat2870_regulator_remove(struct platform_device *pdev) | |
202 | { | |
203 | struct regulator_dev *rdev = platform_get_drvdata(pdev); | |
204 | ||
205 | regulator_unregister(rdev); | |
206 | return 0; | |
207 | } | |
208 | ||
209 | static struct platform_driver aat2870_regulator_driver = { | |
210 | .driver = { | |
211 | .name = "aat2870-regulator", | |
212 | .owner = THIS_MODULE, | |
213 | }, | |
214 | .probe = aat2870_regulator_probe, | |
215 | .remove = __devexit_p(aat2870_regulator_remove), | |
216 | }; | |
217 | ||
218 | static int __init aat2870_regulator_init(void) | |
219 | { | |
220 | return platform_driver_register(&aat2870_regulator_driver); | |
221 | } | |
222 | subsys_initcall(aat2870_regulator_init); | |
223 | ||
224 | static void __exit aat2870_regulator_exit(void) | |
225 | { | |
226 | platform_driver_unregister(&aat2870_regulator_driver); | |
227 | } | |
228 | module_exit(aat2870_regulator_exit); | |
229 | ||
230 | MODULE_DESCRIPTION("AnalogicTech AAT2870 Regulator"); | |
231 | MODULE_LICENSE("GPL"); | |
232 | MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>"); |