Root/drivers/regulator/aat2870-regulator.c

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/module.h>
26#include <linux/slab.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
32struct aat2870_regulator {
33    struct aat2870_data *aat2870;
34    struct regulator_desc desc;
35
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
45static int aat2870_ldo_set_voltage_sel(struct regulator_dev *rdev,
46                       unsigned selector)
47{
48    struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
49    struct aat2870_data *aat2870 = ri->aat2870;
50
51    return aat2870->update(aat2870, ri->voltage_addr, ri->voltage_mask,
52                   selector << ri->voltage_shift);
53}
54
55static int aat2870_ldo_get_voltage_sel(struct regulator_dev *rdev)
56{
57    struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
58    struct aat2870_data *aat2870 = ri->aat2870;
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
69static int aat2870_ldo_enable(struct regulator_dev *rdev)
70{
71    struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
72    struct aat2870_data *aat2870 = ri->aat2870;
73
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);
81    struct aat2870_data *aat2870 = ri->aat2870;
82
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);
89    struct aat2870_data *aat2870 = ri->aat2870;
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
100static struct regulator_ops aat2870_ldo_ops = {
101    .list_voltage = regulator_list_voltage_table,
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
109static const unsigned int aat2870_ldo_voltages[] = {
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), \
122            .volt_table = aat2870_ldo_voltages, \
123            .ops = &aat2870_ldo_ops, \
124            .type = REGULATOR_VOLTAGE, \
125            .owner = THIS_MODULE, \
126        }, \
127    }
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
147    if (i == ARRAY_SIZE(aat2870_regulators))
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
162static int aat2870_regulator_probe(struct platform_device *pdev)
163{
164    struct aat2870_regulator *ri;
165    struct regulator_config config = { 0 };
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    }
173    ri->aat2870 = dev_get_drvdata(pdev->dev.parent);
174
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);
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
190static int __devexit aat2870_regulator_remove(struct platform_device *pdev)
191{
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,
204    .remove = __devexit_p(aat2870_regulator_remove),
205};
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>");
222MODULE_ALIAS("platform:aat2870-regulator");
223

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