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 
29 struct 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 
39 static 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 
46 static 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 
72 static 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 
78 static 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 
105 static const struct regulator_consumer_supply wm8994_ldo_consumer[] = {
106 	{ .supply = "AVDD1" },
107 	{ .supply = "DCVDD" },
108 };
109 
110 static 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 
125 static 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 		config.ena_gpio_initialized = true;
153 	}
154 
155 	/* Use default constraints if none set up */
156 	if (!pdata || !pdata->ldo[id].init_data || wm8994->dev->of_node) {
157 		dev_dbg(wm8994->dev, "Using default init data, supply %s %s\n",
158 			ldo->supply.dev_name, ldo->supply.supply);
159 
160 		ldo->init_data = wm8994_ldo_default[id];
161 		ldo->init_data.consumer_supplies = &ldo->supply;
162 		if (!config.ena_gpio)
163 			ldo->init_data.constraints.valid_ops_mask = 0;
164 	} else {
165 		ldo->init_data = *pdata->ldo[id].init_data;
166 	}
167 
168 	ldo->regulator = devm_regulator_register(&pdev->dev,
169 						 &wm8994_ldo_desc[id],
170 						 &config);
171 	if (IS_ERR(ldo->regulator)) {
172 		ret = PTR_ERR(ldo->regulator);
173 		dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
174 			id + 1, ret);
175 		goto err;
176 	}
177 
178 	platform_set_drvdata(pdev, ldo);
179 
180 	return 0;
181 
182 err:
183 	return ret;
184 }
185 
186 static struct platform_driver wm8994_ldo_driver = {
187 	.probe = wm8994_ldo_probe,
188 	.driver		= {
189 		.name	= "wm8994-ldo",
190 	},
191 };
192 
193 module_platform_driver(wm8994_ldo_driver);
194 
195 /* Module information */
196 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
197 MODULE_DESCRIPTION("WM8994 LDO driver");
198 MODULE_LICENSE("GPL");
199 MODULE_ALIAS("platform:wm8994-ldo");
200