blob: 97aff0ccd65ff3062ec435c8d626941d1cde03c9 [file] [log] [blame]
Gyungoh Yoo9839d622014-08-08 18:10:22 +09001/*
2 * sky81452-regulator.c SKY81452 regulator driver
3 *
4 * Copyright 2014 Skyworks Solutions Inc.
5 * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2, or (at your option) any
10 * later version.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, see <http://www.gnu.org/licenses/>.
19 */
20
21#include <linux/module.h>
22#include <linux/kernel.h>
23#include <linux/platform_device.h>
24#include <linux/init.h>
25#include <linux/err.h>
26#include <linux/of.h>
27#include <linux/regulator/driver.h>
28#include <linux/regulator/of_regulator.h>
29
30/* registers */
31#define SKY81452_REG1 0x01
32#define SKY81452_REG3 0x03
33
34/* bit mask */
35#define SKY81452_LEN 0x40
36#define SKY81452_LOUT 0x1F
37
38static struct regulator_ops sky81452_reg_ops = {
39 .list_voltage = regulator_list_voltage_linear_range,
40 .map_voltage = regulator_map_voltage_linear_range,
41 .get_voltage_sel = regulator_get_voltage_sel_regmap,
42 .set_voltage_sel = regulator_set_voltage_sel_regmap,
43 .enable = regulator_enable_regmap,
44 .disable = regulator_disable_regmap,
45 .is_enabled = regulator_is_enabled_regmap,
46};
47
48static const struct regulator_linear_range sky81452_reg_ranges[] = {
49 REGULATOR_LINEAR_RANGE(4500000, 0, 14, 250000),
50 REGULATOR_LINEAR_RANGE(9000000, 15, 31, 1000000),
51};
52
53static const struct regulator_desc sky81452_reg = {
54 .name = "LOUT",
55 .ops = &sky81452_reg_ops,
56 .type = REGULATOR_VOLTAGE,
57 .owner = THIS_MODULE,
58 .n_voltages = SKY81452_LOUT + 1,
59 .linear_ranges = sky81452_reg_ranges,
60 .n_linear_ranges = ARRAY_SIZE(sky81452_reg_ranges),
61 .vsel_reg = SKY81452_REG3,
62 .vsel_mask = SKY81452_LOUT,
63 .enable_reg = SKY81452_REG1,
64 .enable_mask = SKY81452_LEN,
65};
66
67#ifdef CONFIG_OF
68static struct regulator_init_data *sky81452_reg_parse_dt(struct device *dev)
69{
70 struct regulator_init_data *init_data;
71 struct device_node *np;
72
73 np = of_get_child_by_name(dev->parent->of_node, "regulator");
74 if (unlikely(!np)) {
75 dev_err(dev, "regulator node not found");
76 return NULL;
77 }
78
79 init_data = of_get_regulator_init_data(dev, np);
80
81 of_node_put(np);
82 return init_data;
83}
84#else
85static struct regulator_init_data *sky81452_reg_parse_dt(struct device *dev)
86{
87 return ERR_PTR(-EINVAL);
88}
89#endif
90
91static int sky81452_reg_probe(struct platform_device *pdev)
92{
93 struct device *dev = &pdev->dev;
94 const struct regulator_init_data *init_data = dev_get_platdata(dev);
95 struct regulator_config config = { };
96 struct regulator_dev *rdev;
97
98 if (!init_data) {
99 init_data = sky81452_reg_parse_dt(dev);
100 if (IS_ERR(init_data))
101 return PTR_ERR(init_data);
102 }
103
104 config.dev = dev;
105 config.init_data = init_data;
106 config.of_node = dev->of_node;
107 config.regmap = dev_get_drvdata(dev->parent);
108
109 rdev = devm_regulator_register(dev, &sky81452_reg, &config);
110 if (IS_ERR(rdev))
111 return PTR_ERR(rdev);
112
113 platform_set_drvdata(pdev, rdev);
114
115 return 0;
116}
117
118static struct platform_driver sky81452_reg_driver = {
119 .driver = {
120 .name = "sky81452-regulator",
121 },
122 .probe = sky81452_reg_probe,
123};
124
125module_platform_driver(sky81452_reg_driver);
126
127MODULE_DESCRIPTION("Skyworks SKY81452 Regulator driver");
128MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
129MODULE_LICENSE("GPL");
130MODULE_VERSION("1.0");