blob: f78857bd6a158ad8b86b5b103fd5ba4bcb7ad8c9 [file] [log] [blame]
Linus Walleij3615a342013-09-13 21:01:15 +02001/*
2 * Regulator driver for STw4810/STw4811 VMMC regulator.
3 *
4 * Copyright (C) 2013 ST-Ericsson SA
5 * Written on behalf of Linaro for ST-Ericsson
6 *
7 * Author: Linus Walleij <linus.walleij@linaro.org>
8 *
9 * License terms: GNU General Public License (GPL) version 2
10 */
11
12#include <linux/err.h>
13#include <linux/init.h>
14#include <linux/mfd/stw481x.h>
15#include <linux/module.h>
16#include <linux/platform_device.h>
17#include <linux/regulator/driver.h>
18#include <linux/regulator/of_regulator.h>
19
20static const unsigned int stw481x_vmmc_voltages[] = {
21 1800000,
22 1800000,
23 2850000,
24 3000000,
25 1850000,
26 2600000,
27 2700000,
28 3300000,
29};
30
31static struct regulator_ops stw481x_vmmc_ops = {
32 .list_voltage = regulator_list_voltage_table,
33 .enable = regulator_enable_regmap,
34 .disable = regulator_disable_regmap,
35 .is_enabled = regulator_is_enabled_regmap,
36 .get_voltage_sel = regulator_get_voltage_sel_regmap,
37 .set_voltage_sel = regulator_set_voltage_sel_regmap,
38};
39
40static struct regulator_desc vmmc_regulator = {
41 .name = "VMMC",
42 .id = 0,
43 .ops = &stw481x_vmmc_ops,
44 .type = REGULATOR_VOLTAGE,
45 .owner = THIS_MODULE,
46 .n_voltages = ARRAY_SIZE(stw481x_vmmc_voltages),
47 .volt_table = stw481x_vmmc_voltages,
48 .enable_time = 200, /* FIXME: look this up */
49 .enable_reg = STW_CONF1,
50 .enable_mask = STW_CONF1_PDN_VMMC,
51 .vsel_reg = STW_CONF1,
52 .vsel_mask = STW_CONF1_VMMC_MASK,
53};
54
55static int stw481x_vmmc_regulator_probe(struct platform_device *pdev)
56{
57 struct stw481x *stw481x = dev_get_platdata(&pdev->dev);
58 struct regulator_config config = { };
59 int ret;
60
61 /* First disable the external VMMC if it's active */
62 ret = regmap_update_bits(stw481x->map, STW_CONF2,
63 STW_CONF2_VMMC_EXT, 0);
64 if (ret) {
65 dev_err(&pdev->dev, "could not disable external VMMC\n");
66 return ret;
67 }
68
69 /* Register VMMC regulator */
70 config.dev = &pdev->dev;
71 config.driver_data = stw481x;
72 config.regmap = stw481x->map;
73 config.of_node = pdev->dev.of_node;
74 config.init_data = of_get_regulator_init_data(&pdev->dev,
75 pdev->dev.of_node);
76
77 stw481x->vmmc_regulator = regulator_register(&vmmc_regulator, &config);
78 if (IS_ERR(stw481x->vmmc_regulator)) {
79 dev_err(&pdev->dev,
80 "error initializing STw481x VMMC regulator\n");
81 return PTR_ERR(stw481x->vmmc_regulator);
82 }
83
84 dev_info(&pdev->dev, "initialized STw481x VMMC regulator\n");
85 return 0;
86}
87
88static int stw481x_vmmc_regulator_remove(struct platform_device *pdev)
89{
90 struct stw481x *stw481x = dev_get_platdata(&pdev->dev);
91
92 regulator_unregister(stw481x->vmmc_regulator);
93 return 0;
94}
95
96static const struct of_device_id stw481x_vmmc_match[] = {
97 { .compatible = "st,stw481x-vmmc", },
98 {},
99};
100
101static struct platform_driver stw481x_vmmc_regulator_driver = {
102 .driver = {
103 .name = "stw481x-vmmc-regulator",
104 .owner = THIS_MODULE,
Axel Lin18dca932013-10-02 20:54:20 +0800105 .of_match_table = stw481x_vmmc_match,
Linus Walleij3615a342013-09-13 21:01:15 +0200106 },
107 .probe = stw481x_vmmc_regulator_probe,
108 .remove = stw481x_vmmc_regulator_remove,
109};
110
111module_platform_driver(stw481x_vmmc_regulator_driver);