regulator: lp8788-buck: Kill _gpio_request function
[linux-3.10.git] / drivers / regulator / wm8994-regulator.c
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/gpio.h>
22 #include <linux/slab.h>
23
24 #include <linux/mfd/wm8994/core.h>
25 #include <linux/mfd/wm8994/registers.h>
26 #include <linux/mfd/wm8994/pdata.h>
27
28 struct wm8994_ldo {
29         struct regulator_dev *regulator;
30         struct wm8994 *wm8994;
31 };
32
33 #define WM8994_LDO1_MAX_SELECTOR 0x7
34 #define WM8994_LDO2_MAX_SELECTOR 0x3
35
36 static struct regulator_ops wm8994_ldo1_ops = {
37         .list_voltage = regulator_list_voltage_linear,
38         .map_voltage = regulator_map_voltage_linear,
39         .get_voltage_sel = regulator_get_voltage_sel_regmap,
40         .set_voltage_sel = regulator_set_voltage_sel_regmap,
41 };
42
43 static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev,
44                                     unsigned int selector)
45 {
46         struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
47
48         if (selector > WM8994_LDO2_MAX_SELECTOR)
49                 return -EINVAL;
50
51         switch (ldo->wm8994->type) {
52         case WM8994:
53                 return (selector * 100000) + 900000;
54         case WM8958:
55                 return (selector * 100000) + 1000000;
56         case WM1811:
57                 switch (selector) {
58                 case 0:
59                         return -EINVAL;
60                 default:
61                         return (selector * 100000) + 950000;
62                 }
63                 break;
64         default:
65                 return -EINVAL;
66         }
67 }
68
69 static struct regulator_ops wm8994_ldo2_ops = {
70         .list_voltage = wm8994_ldo2_list_voltage,
71         .get_voltage_sel = regulator_get_voltage_sel_regmap,
72         .set_voltage_sel = regulator_set_voltage_sel_regmap,
73 };
74
75 static const struct regulator_desc wm8994_ldo_desc[] = {
76         {
77                 .name = "LDO1",
78                 .id = 1,
79                 .type = REGULATOR_VOLTAGE,
80                 .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
81                 .vsel_reg = WM8994_LDO_1,
82                 .vsel_mask = WM8994_LDO1_VSEL_MASK,
83                 .ops = &wm8994_ldo1_ops,
84                 .min_uV = 2400000,
85                 .uV_step = 100000,
86                 .enable_time = 3000,
87                 .owner = THIS_MODULE,
88         },
89         {
90                 .name = "LDO2",
91                 .id = 2,
92                 .type = REGULATOR_VOLTAGE,
93                 .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
94                 .vsel_reg = WM8994_LDO_2,
95                 .vsel_mask = WM8994_LDO2_VSEL_MASK,
96                 .ops = &wm8994_ldo2_ops,
97                 .enable_time = 3000,
98                 .owner = THIS_MODULE,
99         },
100 };
101
102 static __devinit int wm8994_ldo_probe(struct platform_device *pdev)
103 {
104         struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
105         struct wm8994_pdata *pdata = wm8994->dev->platform_data;
106         int id = pdev->id % ARRAY_SIZE(pdata->ldo);
107         struct regulator_config config = { };
108         struct wm8994_ldo *ldo;
109         int ret;
110
111         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
112
113         ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL);
114         if (ldo == NULL) {
115                 dev_err(&pdev->dev, "Unable to allocate private data\n");
116                 return -ENOMEM;
117         }
118
119         ldo->wm8994 = wm8994;
120
121         config.dev = wm8994->dev;
122         config.driver_data = ldo;
123         config.regmap = wm8994->regmap;
124         if (pdata) {
125                 config.init_data = pdata->ldo[id].init_data;
126                 config.ena_gpio = pdata->ldo[id].enable;
127         }
128
129         ldo->regulator = regulator_register(&wm8994_ldo_desc[id], &config);
130         if (IS_ERR(ldo->regulator)) {
131                 ret = PTR_ERR(ldo->regulator);
132                 dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
133                         id + 1, ret);
134                 goto err;
135         }
136
137         platform_set_drvdata(pdev, ldo);
138
139         return 0;
140
141 err:
142         return ret;
143 }
144
145 static __devexit int wm8994_ldo_remove(struct platform_device *pdev)
146 {
147         struct wm8994_ldo *ldo = platform_get_drvdata(pdev);
148
149         platform_set_drvdata(pdev, NULL);
150
151         regulator_unregister(ldo->regulator);
152
153         return 0;
154 }
155
156 static struct platform_driver wm8994_ldo_driver = {
157         .probe = wm8994_ldo_probe,
158         .remove = __devexit_p(wm8994_ldo_remove),
159         .driver         = {
160                 .name   = "wm8994-ldo",
161                 .owner  = THIS_MODULE,
162         },
163 };
164
165 static int __init wm8994_ldo_init(void)
166 {
167         int ret;
168
169         ret = platform_driver_register(&wm8994_ldo_driver);
170         if (ret != 0)
171                 pr_err("Failed to register Wm8994 GP LDO driver: %d\n", ret);
172
173         return ret;
174 }
175 subsys_initcall(wm8994_ldo_init);
176
177 static void __exit wm8994_ldo_exit(void)
178 {
179         platform_driver_unregister(&wm8994_ldo_driver);
180 }
181 module_exit(wm8994_ldo_exit);
182
183 /* Module information */
184 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
185 MODULE_DESCRIPTION("WM8994 LDO driver");
186 MODULE_LICENSE("GPL");
187 MODULE_ALIAS("platform:wm8994-ldo");