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Jin Parkf7eb6c52011-07-04 17:43:42 +09001/*
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>
Randy Dunlap3a7d0212011-07-30 06:13:09 +020025#include <linux/module.h>
Jin Parkf7eb6c52011-07-04 17:43:42 +090026#include <linux/slab.h>
27#include <linux/delay.h>
28#include <linux/platform_device.h>
29#include <linux/regulator/driver.h>
30#include <linux/regulator/machine.h>
31#include <linux/mfd/aat2870.h>
32
33struct aat2870_regulator {
34 struct platform_device *pdev;
35 struct regulator_desc desc;
36
37 const int *voltages; /* uV */
38
39 int min_uV;
40 int max_uV;
41
42 u8 enable_addr;
43 u8 enable_shift;
44 u8 enable_mask;
45
46 u8 voltage_addr;
47 u8 voltage_shift;
48 u8 voltage_mask;
49};
50
51static int aat2870_ldo_list_voltage(struct regulator_dev *rdev,
52 unsigned selector)
53{
54 struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
55
56 return ri->voltages[selector];
57}
58
59static int aat2870_ldo_set_voltage_sel(struct regulator_dev *rdev,
60 unsigned selector)
61{
62 struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
63 struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent);
64
65 return aat2870->update(aat2870, ri->voltage_addr, ri->voltage_mask,
66 (selector << ri->voltage_shift) & ri->voltage_mask);
67}
68
69static int aat2870_ldo_get_voltage_sel(struct regulator_dev *rdev)
70{
71 struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
72 struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent);
73 u8 val;
74 int ret;
75
76 ret = aat2870->read(aat2870, ri->voltage_addr, &val);
77 if (ret)
78 return ret;
79
80 return (val & ri->voltage_mask) >> ri->voltage_shift;
81}
82
83static int aat2870_ldo_enable(struct regulator_dev *rdev)
84{
85 struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
86 struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent);
87
88 return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask,
89 ri->enable_mask);
90}
91
92static int aat2870_ldo_disable(struct regulator_dev *rdev)
93{
94 struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
95 struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent);
96
97 return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask, 0);
98}
99
100static int aat2870_ldo_is_enabled(struct regulator_dev *rdev)
101{
102 struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
103 struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent);
104 u8 val;
105 int ret;
106
107 ret = aat2870->read(aat2870, ri->enable_addr, &val);
108 if (ret)
109 return ret;
110
111 return val & ri->enable_mask ? 1 : 0;
112}
113
114static struct regulator_ops aat2870_ldo_ops = {
115 .list_voltage = aat2870_ldo_list_voltage,
116 .set_voltage_sel = aat2870_ldo_set_voltage_sel,
117 .get_voltage_sel = aat2870_ldo_get_voltage_sel,
118 .enable = aat2870_ldo_enable,
119 .disable = aat2870_ldo_disable,
120 .is_enabled = aat2870_ldo_is_enabled,
121};
122
123static const int aat2870_ldo_voltages[] = {
124 1200000, 1300000, 1500000, 1600000,
125 1800000, 2000000, 2200000, 2500000,
126 2600000, 2700000, 2800000, 2900000,
127 3000000, 3100000, 3200000, 3300000,
128};
129
130#define AAT2870_LDO(ids) \
131 { \
132 .desc = { \
133 .name = #ids, \
134 .id = AAT2870_ID_##ids, \
135 .n_voltages = ARRAY_SIZE(aat2870_ldo_voltages), \
136 .ops = &aat2870_ldo_ops, \
137 .type = REGULATOR_VOLTAGE, \
138 .owner = THIS_MODULE, \
139 }, \
140 .voltages = aat2870_ldo_voltages, \
141 .min_uV = 1200000, \
142 .max_uV = 3300000, \
143 }
144
145static struct aat2870_regulator aat2870_regulators[] = {
146 AAT2870_LDO(LDOA),
147 AAT2870_LDO(LDOB),
148 AAT2870_LDO(LDOC),
149 AAT2870_LDO(LDOD),
150};
151
152static struct aat2870_regulator *aat2870_get_regulator(int id)
153{
154 struct aat2870_regulator *ri = NULL;
155 int i;
156
157 for (i = 0; i < ARRAY_SIZE(aat2870_regulators); i++) {
158 ri = &aat2870_regulators[i];
159 if (ri->desc.id == id)
160 break;
161 }
162
Axel Lind4d63732011-11-28 14:06:31 +0800163 if (i == ARRAY_SIZE(aat2870_regulators))
Jin Parkf7eb6c52011-07-04 17:43:42 +0900164 return NULL;
165
166 ri->enable_addr = AAT2870_LDO_EN;
167 ri->enable_shift = id - AAT2870_ID_LDOA;
168 ri->enable_mask = 0x1 << ri->enable_shift;
169
170 ri->voltage_addr = (id - AAT2870_ID_LDOA) / 2 ?
171 AAT2870_LDO_CD : AAT2870_LDO_AB;
172 ri->voltage_shift = (id - AAT2870_ID_LDOA) % 2 ? 0 : 4;
173 ri->voltage_mask = 0xF << ri->voltage_shift;
174
175 return ri;
176}
177
178static int aat2870_regulator_probe(struct platform_device *pdev)
179{
180 struct aat2870_regulator *ri;
181 struct regulator_dev *rdev;
182
183 ri = aat2870_get_regulator(pdev->id);
184 if (!ri) {
185 dev_err(&pdev->dev, "Invalid device ID, %d\n", pdev->id);
186 return -EINVAL;
187 }
188 ri->pdev = pdev;
189
190 rdev = regulator_register(&ri->desc, &pdev->dev,
191 pdev->dev.platform_data, ri);
192 if (IS_ERR(rdev)) {
193 dev_err(&pdev->dev, "Failed to register regulator %s\n",
194 ri->desc.name);
195 return PTR_ERR(rdev);
196 }
197 platform_set_drvdata(pdev, rdev);
198
199 return 0;
200}
201
202static int __devexit aat2870_regulator_remove(struct platform_device *pdev)
203{
204 struct regulator_dev *rdev = platform_get_drvdata(pdev);
205
206 regulator_unregister(rdev);
207 return 0;
208}
209
210static struct platform_driver aat2870_regulator_driver = {
211 .driver = {
212 .name = "aat2870-regulator",
213 .owner = THIS_MODULE,
214 },
215 .probe = aat2870_regulator_probe,
216 .remove = __devexit_p(aat2870_regulator_remove),
217};
218
219static int __init aat2870_regulator_init(void)
220{
221 return platform_driver_register(&aat2870_regulator_driver);
222}
223subsys_initcall(aat2870_regulator_init);
224
225static void __exit aat2870_regulator_exit(void)
226{
227 platform_driver_unregister(&aat2870_regulator_driver);
228}
229module_exit(aat2870_regulator_exit);
230
231MODULE_DESCRIPTION("AnalogicTech AAT2870 Regulator");
232MODULE_LICENSE("GPL");
233MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>");