1/*
2 * wm8994-regulator.c  --  Regulator driver for the WM8994
3 *
4 * Copyright 2009 Wolfson Microelectronics PLC.
5 *
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
7 *
8 *  This program is free software; you can redistribute  it and/or modify it
9 *  under  the terms of  the GNU General  Public License as published by the
10 *  Free Software Foundation;  either version 2 of the  License, or (at your
11 *  option) any later version.
12 */
13
14#include <linux/module.h>
15#include <linux/moduleparam.h>
16#include <linux/init.h>
17#include <linux/bitops.h>
18#include <linux/err.h>
19#include <linux/platform_device.h>
20#include <linux/regulator/driver.h>
21#include <linux/regulator/machine.h>
22#include <linux/gpio.h>
23#include <linux/slab.h>
24
25#include <linux/mfd/wm8994/core.h>
26#include <linux/mfd/wm8994/registers.h>
27#include <linux/mfd/wm8994/pdata.h>
28
29struct wm8994_ldo {
30	struct regulator_dev *regulator;
31	struct wm8994 *wm8994;
32	struct regulator_consumer_supply supply;
33	struct regulator_init_data init_data;
34};
35
36#define WM8994_LDO1_MAX_SELECTOR 0x7
37#define WM8994_LDO2_MAX_SELECTOR 0x3
38
39static struct regulator_ops wm8994_ldo1_ops = {
40	.list_voltage = regulator_list_voltage_linear,
41	.map_voltage = regulator_map_voltage_linear,
42	.get_voltage_sel = regulator_get_voltage_sel_regmap,
43	.set_voltage_sel = regulator_set_voltage_sel_regmap,
44};
45
46static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev,
47				    unsigned int selector)
48{
49	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
50
51	if (selector > WM8994_LDO2_MAX_SELECTOR)
52		return -EINVAL;
53
54	switch (ldo->wm8994->type) {
55	case WM8994:
56		return (selector * 100000) + 900000;
57	case WM8958:
58		return (selector * 100000) + 1000000;
59	case WM1811:
60		switch (selector) {
61		case 0:
62			return -EINVAL;
63		default:
64			return (selector * 100000) + 950000;
65		}
66		break;
67	default:
68		return -EINVAL;
69	}
70}
71
72static struct regulator_ops wm8994_ldo2_ops = {
73	.list_voltage = wm8994_ldo2_list_voltage,
74	.get_voltage_sel = regulator_get_voltage_sel_regmap,
75	.set_voltage_sel = regulator_set_voltage_sel_regmap,
76};
77
78static const struct regulator_desc wm8994_ldo_desc[] = {
79	{
80		.name = "LDO1",
81		.id = 1,
82		.type = REGULATOR_VOLTAGE,
83		.n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
84		.vsel_reg = WM8994_LDO_1,
85		.vsel_mask = WM8994_LDO1_VSEL_MASK,
86		.ops = &wm8994_ldo1_ops,
87		.min_uV = 2400000,
88		.uV_step = 100000,
89		.enable_time = 3000,
90		.owner = THIS_MODULE,
91	},
92	{
93		.name = "LDO2",
94		.id = 2,
95		.type = REGULATOR_VOLTAGE,
96		.n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
97		.vsel_reg = WM8994_LDO_2,
98		.vsel_mask = WM8994_LDO2_VSEL_MASK,
99		.ops = &wm8994_ldo2_ops,
100		.enable_time = 3000,
101		.owner = THIS_MODULE,
102	},
103};
104
105static const struct regulator_consumer_supply wm8994_ldo_consumer[] = {
106	{ .supply = "AVDD1" },
107	{ .supply = "DCVDD" },
108};
109
110static const struct regulator_init_data wm8994_ldo_default[] = {
111	{
112		.constraints = {
113			.valid_ops_mask = REGULATOR_CHANGE_STATUS,
114		},
115		.num_consumer_supplies = 1,
116	},
117	{
118		.constraints = {
119			.valid_ops_mask = REGULATOR_CHANGE_STATUS,
120		},
121		.num_consumer_supplies = 1,
122	},
123};
124
125static int wm8994_ldo_probe(struct platform_device *pdev)
126{
127	struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
128	struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);
129	int id = pdev->id % ARRAY_SIZE(pdata->ldo);
130	struct regulator_config config = { };
131	struct wm8994_ldo *ldo;
132	int ret;
133
134	dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
135
136	ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL);
137	if (!ldo)
138		return -ENOMEM;
139
140	ldo->wm8994 = wm8994;
141	ldo->supply = wm8994_ldo_consumer[id];
142	ldo->supply.dev_name = dev_name(wm8994->dev);
143
144	config.dev = wm8994->dev;
145	config.driver_data = ldo;
146	config.regmap = wm8994->regmap;
147	config.init_data = &ldo->init_data;
148	if (pdata)
149		config.ena_gpio = pdata->ldo[id].enable;
150	else if (wm8994->dev->of_node)
151		config.ena_gpio = wm8994->pdata.ldo[id].enable;
152
153	/* Use default constraints if none set up */
154	if (!pdata || !pdata->ldo[id].init_data || wm8994->dev->of_node) {
155		dev_dbg(wm8994->dev, "Using default init data, supply %s %s\n",
156			ldo->supply.dev_name, ldo->supply.supply);
157
158		ldo->init_data = wm8994_ldo_default[id];
159		ldo->init_data.consumer_supplies = &ldo->supply;
160		if (!config.ena_gpio)
161			ldo->init_data.constraints.valid_ops_mask = 0;
162	} else {
163		ldo->init_data = *pdata->ldo[id].init_data;
164	}
165
166	ldo->regulator = devm_regulator_register(&pdev->dev,
167						 &wm8994_ldo_desc[id],
168						 &config);
169	if (IS_ERR(ldo->regulator)) {
170		ret = PTR_ERR(ldo->regulator);
171		dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
172			id + 1, ret);
173		goto err;
174	}
175
176	platform_set_drvdata(pdev, ldo);
177
178	return 0;
179
180err:
181	return ret;
182}
183
184static struct platform_driver wm8994_ldo_driver = {
185	.probe = wm8994_ldo_probe,
186	.driver		= {
187		.name	= "wm8994-ldo",
188		.owner	= THIS_MODULE,
189	},
190};
191
192module_platform_driver(wm8994_ldo_driver);
193
194/* Module information */
195MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
196MODULE_DESCRIPTION("WM8994 LDO driver");
197MODULE_LICENSE("GPL");
198MODULE_ALIAS("platform:wm8994-ldo");
199