1 /*
2  * arizona-ldo1.c  --  LDO1 supply for Arizona devices
3  *
4  * Copyright 2012 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/arizona/core.h>
26 #include <linux/mfd/arizona/pdata.h>
27 #include <linux/mfd/arizona/registers.h>
28 
29 struct arizona_ldo1 {
30 	struct regulator_dev *regulator;
31 	struct arizona *arizona;
32 
33 	struct regulator_consumer_supply supply;
34 	struct regulator_init_data init_data;
35 };
36 
37 static struct regulator_ops arizona_ldo1_ops = {
38 	.list_voltage = regulator_list_voltage_linear,
39 	.map_voltage = regulator_map_voltage_linear,
40 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
41 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
42 	.get_bypass = regulator_get_bypass_regmap,
43 	.set_bypass = regulator_set_bypass_regmap,
44 };
45 
46 static const struct regulator_desc arizona_ldo1 = {
47 	.name = "LDO1",
48 	.supply_name = "LDOVDD",
49 	.type = REGULATOR_VOLTAGE,
50 	.ops = &arizona_ldo1_ops,
51 
52 	.vsel_reg = ARIZONA_LDO1_CONTROL_1,
53 	.vsel_mask = ARIZONA_LDO1_VSEL_MASK,
54 	.bypass_reg = ARIZONA_LDO1_CONTROL_1,
55 	.bypass_mask = ARIZONA_LDO1_BYPASS,
56 	.min_uV = 900000,
57 	.uV_step = 50000,
58 	.n_voltages = 6,
59 
60 	.owner = THIS_MODULE,
61 };
62 
63 static const struct regulator_init_data arizona_ldo1_default = {
64 	.constraints = {
65 		.valid_ops_mask = REGULATOR_CHANGE_STATUS,
66 	},
67 	.num_consumer_supplies = 1,
68 };
69 
70 static __devinit int arizona_ldo1_probe(struct platform_device *pdev)
71 {
72 	struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
73 	struct regulator_config config = { };
74 	struct arizona_ldo1 *ldo1;
75 	int ret;
76 
77 	ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL);
78 	if (ldo1 == NULL) {
79 		dev_err(&pdev->dev, "Unable to allocate private data\n");
80 		return -ENOMEM;
81 	}
82 
83 	ldo1->arizona = arizona;
84 
85 	/*
86 	 * Since the chip usually supplies itself we provide some
87 	 * default init_data for it.  This will be overridden with
88 	 * platform data if provided.
89 	 */
90 	ldo1->init_data = arizona_ldo1_default;
91 	ldo1->init_data.consumer_supplies = &ldo1->supply;
92 	ldo1->supply.supply = "DCVDD";
93 	ldo1->supply.dev_name = dev_name(arizona->dev);
94 
95 	config.dev = arizona->dev;
96 	config.driver_data = ldo1;
97 	config.regmap = arizona->regmap;
98 	config.ena_gpio = arizona->pdata.ldoena;
99 
100 	if (arizona->pdata.ldo1)
101 		config.init_data = arizona->pdata.ldo1;
102 	else
103 		config.init_data = &ldo1->init_data;
104 
105 	ldo1->regulator = regulator_register(&arizona_ldo1, &config);
106 	if (IS_ERR(ldo1->regulator)) {
107 		ret = PTR_ERR(ldo1->regulator);
108 		dev_err(arizona->dev, "Failed to register LDO1 supply: %d\n",
109 			ret);
110 		return ret;
111 	}
112 
113 	platform_set_drvdata(pdev, ldo1);
114 
115 	return 0;
116 }
117 
118 static __devexit int arizona_ldo1_remove(struct platform_device *pdev)
119 {
120 	struct arizona_ldo1 *ldo1 = platform_get_drvdata(pdev);
121 
122 	regulator_unregister(ldo1->regulator);
123 
124 	return 0;
125 }
126 
127 static struct platform_driver arizona_ldo1_driver = {
128 	.probe = arizona_ldo1_probe,
129 	.remove = __devexit_p(arizona_ldo1_remove),
130 	.driver		= {
131 		.name	= "arizona-ldo1",
132 		.owner	= THIS_MODULE,
133 	},
134 };
135 
136 module_platform_driver(arizona_ldo1_driver);
137 
138 /* Module information */
139 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
140 MODULE_DESCRIPTION("Arizona LDO1 driver");
141 MODULE_LICENSE("GPL");
142 MODULE_ALIAS("platform:arizona-ldo1");
143