blob: 8b5876356db97da46cd5ac0dd59dccb4b2521361 [file] [log] [blame]
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>
Jin Parkf7eb6c52011-07-04 17:43:42 +090027#include <linux/platform_device.h>
28#include <linux/regulator/driver.h>
29#include <linux/regulator/machine.h>
30#include <linux/mfd/aat2870.h>
31
32struct aat2870_regulator {
Axel Linb21bcd12012-03-02 09:28:44 +080033 struct aat2870_data *aat2870;
Jin Parkf7eb6c52011-07-04 17:43:42 +090034 struct regulator_desc desc;
35
Jin Parkf7eb6c52011-07-04 17:43:42 +090036 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
Jin Parkf7eb6c52011-07-04 17:43:42 +090045static int aat2870_ldo_set_voltage_sel(struct regulator_dev *rdev,
46 unsigned selector)
47{
48 struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
Axel Linb21bcd12012-03-02 09:28:44 +080049 struct aat2870_data *aat2870 = ri->aat2870;
Jin Parkf7eb6c52011-07-04 17:43:42 +090050
51 return aat2870->update(aat2870, ri->voltage_addr, ri->voltage_mask,
Axel Lina5228d22011-11-28 14:07:48 +080052 selector << ri->voltage_shift);
Jin Parkf7eb6c52011-07-04 17:43:42 +090053}
54
55static int aat2870_ldo_get_voltage_sel(struct regulator_dev *rdev)
56{
57 struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
Axel Linb21bcd12012-03-02 09:28:44 +080058 struct aat2870_data *aat2870 = ri->aat2870;
Jin Parkf7eb6c52011-07-04 17:43:42 +090059 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
69static int aat2870_ldo_enable(struct regulator_dev *rdev)
70{
71 struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
Axel Linb21bcd12012-03-02 09:28:44 +080072 struct aat2870_data *aat2870 = ri->aat2870;
Jin Parkf7eb6c52011-07-04 17:43:42 +090073
74 return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask,
75 ri->enable_mask);
76}
77
78static int aat2870_ldo_disable(struct regulator_dev *rdev)
79{
80 struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
Axel Linb21bcd12012-03-02 09:28:44 +080081 struct aat2870_data *aat2870 = ri->aat2870;
Jin Parkf7eb6c52011-07-04 17:43:42 +090082
83 return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask, 0);
84}
85
86static int aat2870_ldo_is_enabled(struct regulator_dev *rdev)
87{
88 struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
Axel Linb21bcd12012-03-02 09:28:44 +080089 struct aat2870_data *aat2870 = ri->aat2870;
Jin Parkf7eb6c52011-07-04 17:43:42 +090090 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
100static struct regulator_ops aat2870_ldo_ops = {
Axel Lin4506c6d2012-07-06 19:14:32 +0800101 .list_voltage = regulator_list_voltage_table,
Jin Parkf7eb6c52011-07-04 17:43:42 +0900102 .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
Axel Lin4506c6d2012-07-06 19:14:32 +0800109static const unsigned int aat2870_ldo_voltages[] = {
Jin Parkf7eb6c52011-07-04 17:43:42 +0900110 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), \
Axel Lin4506c6d2012-07-06 19:14:32 +0800122 .volt_table = aat2870_ldo_voltages, \
Jin Parkf7eb6c52011-07-04 17:43:42 +0900123 .ops = &aat2870_ldo_ops, \
124 .type = REGULATOR_VOLTAGE, \
125 .owner = THIS_MODULE, \
126 }, \
Jin Parkf7eb6c52011-07-04 17:43:42 +0900127 }
128
129static struct aat2870_regulator aat2870_regulators[] = {
130 AAT2870_LDO(LDOA),
131 AAT2870_LDO(LDOB),
132 AAT2870_LDO(LDOC),
133 AAT2870_LDO(LDOD),
134};
135
136static 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
Axel Lind4d63732011-11-28 14:06:31 +0800147 if (i == ARRAY_SIZE(aat2870_regulators))
Jin Parkf7eb6c52011-07-04 17:43:42 +0900148 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
162static int aat2870_regulator_probe(struct platform_device *pdev)
163{
164 struct aat2870_regulator *ri;
Mark Browne4c52882012-09-10 12:07:23 +0800165 struct regulator_config config = { };
Jin Parkf7eb6c52011-07-04 17:43:42 +0900166 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 }
Axel Linb21bcd12012-03-02 09:28:44 +0800173 ri->aat2870 = dev_get_drvdata(pdev->dev.parent);
Jin Parkf7eb6c52011-07-04 17:43:42 +0900174
Mark Brownc1727082012-04-04 00:50:22 +0100175 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);
Jin Parkf7eb6c52011-07-04 17:43:42 +0900180 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
Bill Pemberton8dc995f2012-11-19 13:26:10 -0500190static int aat2870_regulator_remove(struct platform_device *pdev)
Jin Parkf7eb6c52011-07-04 17:43:42 +0900191{
192 struct regulator_dev *rdev = platform_get_drvdata(pdev);
193
194 regulator_unregister(rdev);
195 return 0;
196}
197
198static struct platform_driver aat2870_regulator_driver = {
199 .driver = {
200 .name = "aat2870-regulator",
201 .owner = THIS_MODULE,
202 },
203 .probe = aat2870_regulator_probe,
Bill Pemberton5eb9f2b2012-11-19 13:20:42 -0500204 .remove = aat2870_regulator_remove,
Jin Parkf7eb6c52011-07-04 17:43:42 +0900205};
206
207static int __init aat2870_regulator_init(void)
208{
209 return platform_driver_register(&aat2870_regulator_driver);
210}
211subsys_initcall(aat2870_regulator_init);
212
213static void __exit aat2870_regulator_exit(void)
214{
215 platform_driver_unregister(&aat2870_regulator_driver);
216}
217module_exit(aat2870_regulator_exit);
218
219MODULE_DESCRIPTION("AnalogicTech AAT2870 Regulator");
220MODULE_LICENSE("GPL");
221MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>");
Mark Brownad9c5ff2012-03-14 17:44:56 +0000222MODULE_ALIAS("platform:aat2870-regulator");