1/*
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 | STW_CONF1_MMC_LS_STATUS,
51 .enable_val = STW_CONF1_PDN_VMMC,
52 .vsel_reg = STW_CONF1,
53 .vsel_mask = STW_CONF1_VMMC_MASK,
54};
55
56static int stw481x_vmmc_regulator_probe(struct platform_device *pdev)
57{
58 struct stw481x *stw481x = dev_get_platdata(&pdev->dev);
59 struct regulator_config config = { };
60 struct regulator_dev *rdev;
61 int ret;
62
63 /* First disable the external VMMC if it's active */
64 ret = regmap_update_bits(stw481x->map, STW_CONF2,
65 STW_CONF2_VMMC_EXT, 0);
66 if (ret) {
67 dev_err(&pdev->dev, "could not disable external VMMC\n");
68 return ret;
69 }
70
71 /* Register VMMC regulator */
72 config.dev = &pdev->dev;
73 config.driver_data = stw481x;
74 config.regmap = stw481x->map;
75 config.of_node = pdev->dev.of_node;
76 config.init_data = of_get_regulator_init_data(&pdev->dev,
77 pdev->dev.of_node,
78 &vmmc_regulator);
79
80 rdev = devm_regulator_register(&pdev->dev, &vmmc_regulator, &config);
81 if (IS_ERR(rdev)) {
82 dev_err(&pdev->dev,
83 "error initializing STw481x VMMC regulator\n");
84 return PTR_ERR(rdev);
85 }
86
87 dev_info(&pdev->dev, "initialized STw481x VMMC regulator\n");
88 return 0;
89}
90
91static const struct of_device_id stw481x_vmmc_match[] = {
92 { .compatible = "st,stw481x-vmmc", },
93 {},
94};
95
96static struct platform_driver stw481x_vmmc_regulator_driver = {
97 .driver = {
98 .name = "stw481x-vmmc-regulator",
99 .of_match_table = stw481x_vmmc_match,
100 },
101 .probe = stw481x_vmmc_regulator_probe,
102};
103
104module_platform_driver(stw481x_vmmc_regulator_driver);
105