Merge remote-tracking branch 'regulator/topic/drivers' into regulator-next
[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         int enable;
30         bool is_enabled;
31         struct regulator_dev *regulator;
32         struct wm8994 *wm8994;
33 };
34
35 #define WM8994_LDO1_MAX_SELECTOR 0x7
36 #define WM8994_LDO2_MAX_SELECTOR 0x3
37
38 static int wm8994_ldo_enable(struct regulator_dev *rdev)
39 {
40         struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
41
42         /* If we have no soft control assume that the LDO is always enabled. */
43         if (!ldo->enable)
44                 return 0;
45
46         gpio_set_value_cansleep(ldo->enable, 1);
47         ldo->is_enabled = true;
48
49         return 0;
50 }
51
52 static int wm8994_ldo_disable(struct regulator_dev *rdev)
53 {
54         struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
55
56         /* If we have no soft control assume that the LDO is always enabled. */
57         if (!ldo->enable)
58                 return -EINVAL;
59
60         gpio_set_value_cansleep(ldo->enable, 0);
61         ldo->is_enabled = false;
62
63         return 0;
64 }
65
66 static int wm8994_ldo_is_enabled(struct regulator_dev *rdev)
67 {
68         struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
69
70         return ldo->is_enabled;
71 }
72
73 static int wm8994_ldo_enable_time(struct regulator_dev *rdev)
74 {
75         /* 3ms is fairly conservative but this shouldn't be too performance
76          * critical; can be tweaked per-system if required. */
77         return 3000;
78 }
79
80 static int wm8994_ldo1_list_voltage(struct regulator_dev *rdev,
81                                     unsigned int selector)
82 {
83         if (selector > WM8994_LDO1_MAX_SELECTOR)
84                 return -EINVAL;
85
86         return (selector * 100000) + 2400000;
87 }
88
89 static struct regulator_ops wm8994_ldo1_ops = {
90         .enable = wm8994_ldo_enable,
91         .disable = wm8994_ldo_disable,
92         .is_enabled = wm8994_ldo_is_enabled,
93         .enable_time = wm8994_ldo_enable_time,
94
95         .list_voltage = wm8994_ldo1_list_voltage,
96         .get_voltage_sel = regulator_get_voltage_sel_regmap,
97         .set_voltage_sel = regulator_set_voltage_sel_regmap,
98 };
99
100 static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev,
101                                     unsigned int selector)
102 {
103         struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
104
105         if (selector > WM8994_LDO2_MAX_SELECTOR)
106                 return -EINVAL;
107
108         switch (ldo->wm8994->type) {
109         case WM8994:
110                 return (selector * 100000) + 900000;
111         case WM8958:
112                 return (selector * 100000) + 1000000;
113         case WM1811:
114                 switch (selector) {
115                 case 0:
116                         return -EINVAL;
117                 default:
118                         return (selector * 100000) + 950000;
119                 }
120                 break;
121         default:
122                 return -EINVAL;
123         }
124 }
125
126 static struct regulator_ops wm8994_ldo2_ops = {
127         .enable = wm8994_ldo_enable,
128         .disable = wm8994_ldo_disable,
129         .is_enabled = wm8994_ldo_is_enabled,
130         .enable_time = wm8994_ldo_enable_time,
131
132         .list_voltage = wm8994_ldo2_list_voltage,
133         .get_voltage_sel = regulator_get_voltage_sel_regmap,
134         .set_voltage_sel = regulator_set_voltage_sel_regmap,
135 };
136
137 static const struct regulator_desc wm8994_ldo_desc[] = {
138         {
139                 .name = "LDO1",
140                 .id = 1,
141                 .type = REGULATOR_VOLTAGE,
142                 .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
143                 .vsel_reg = WM8994_LDO_1,
144                 .vsel_mask = WM8994_LDO1_VSEL_MASK,
145                 .ops = &wm8994_ldo1_ops,
146                 .owner = THIS_MODULE,
147         },
148         {
149                 .name = "LDO2",
150                 .id = 2,
151                 .type = REGULATOR_VOLTAGE,
152                 .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
153                 .vsel_reg = WM8994_LDO_2,
154                 .vsel_mask = WM8994_LDO2_VSEL_MASK,
155                 .ops = &wm8994_ldo2_ops,
156                 .owner = THIS_MODULE,
157         },
158 };
159
160 static __devinit int wm8994_ldo_probe(struct platform_device *pdev)
161 {
162         struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
163         struct wm8994_pdata *pdata = wm8994->dev->platform_data;
164         int id = pdev->id % ARRAY_SIZE(pdata->ldo);
165         struct regulator_config config = { };
166         struct wm8994_ldo *ldo;
167         int ret;
168
169         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
170
171         if (!pdata)
172                 return -ENODEV;
173
174         ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL);
175         if (ldo == NULL) {
176                 dev_err(&pdev->dev, "Unable to allocate private data\n");
177                 return -ENOMEM;
178         }
179
180         ldo->wm8994 = wm8994;
181
182         if (pdata->ldo[id].enable && gpio_is_valid(pdata->ldo[id].enable)) {
183                 ldo->enable = pdata->ldo[id].enable;
184
185                 ret = gpio_request_one(ldo->enable, 0, "WM8994 LDO enable");
186                 if (ret < 0) {
187                         dev_err(&pdev->dev, "Failed to get enable GPIO: %d\n",
188                                 ret);
189                         goto err;
190                 }
191         } else
192                 ldo->is_enabled = true;
193
194         config.dev = wm8994->dev;
195         config.init_data = pdata->ldo[id].init_data;
196         config.driver_data = ldo;
197         config.regmap = wm8994->regmap;
198
199         ldo->regulator = regulator_register(&wm8994_ldo_desc[id], &config);
200         if (IS_ERR(ldo->regulator)) {
201                 ret = PTR_ERR(ldo->regulator);
202                 dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
203                         id + 1, ret);
204                 goto err_gpio;
205         }
206
207         platform_set_drvdata(pdev, ldo);
208
209         return 0;
210
211 err_gpio:
212         if (gpio_is_valid(ldo->enable))
213                 gpio_free(ldo->enable);
214 err:
215         return ret;
216 }
217
218 static __devexit int wm8994_ldo_remove(struct platform_device *pdev)
219 {
220         struct wm8994_ldo *ldo = platform_get_drvdata(pdev);
221
222         platform_set_drvdata(pdev, NULL);
223
224         regulator_unregister(ldo->regulator);
225         if (gpio_is_valid(ldo->enable))
226                 gpio_free(ldo->enable);
227
228         return 0;
229 }
230
231 static struct platform_driver wm8994_ldo_driver = {
232         .probe = wm8994_ldo_probe,
233         .remove = __devexit_p(wm8994_ldo_remove),
234         .driver         = {
235                 .name   = "wm8994-ldo",
236                 .owner  = THIS_MODULE,
237         },
238 };
239
240 static int __init wm8994_ldo_init(void)
241 {
242         int ret;
243
244         ret = platform_driver_register(&wm8994_ldo_driver);
245         if (ret != 0)
246                 pr_err("Failed to register Wm8994 GP LDO driver: %d\n", ret);
247
248         return ret;
249 }
250 subsys_initcall(wm8994_ldo_init);
251
252 static void __exit wm8994_ldo_exit(void)
253 {
254         platform_driver_unregister(&wm8994_ldo_driver);
255 }
256 module_exit(wm8994_ldo_exit);
257
258 /* Module information */
259 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
260 MODULE_DESCRIPTION("WM8994 LDO driver");
261 MODULE_LICENSE("GPL");
262 MODULE_ALIAS("platform:wm8994-ldo");