include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit...
[linux-2.6.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(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(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 int wm8994_ldo1_get_voltage(struct regulator_dev *rdev)
90 {
91         struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
92         int val;
93
94         val = wm8994_reg_read(ldo->wm8994, WM8994_LDO_1);
95         if (val < 0)
96                 return val;
97
98         val = (val & WM8994_LDO1_VSEL_MASK) >> WM8994_LDO1_VSEL_SHIFT;
99
100         return wm8994_ldo1_list_voltage(rdev, val);
101 }
102
103 static int wm8994_ldo1_set_voltage(struct regulator_dev *rdev,
104                                    int min_uV, int max_uV)
105 {
106         struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
107         int selector, v;
108
109         selector = (min_uV - 2400000) / 100000;
110         v = wm8994_ldo1_list_voltage(rdev, selector);
111         if (v < 0 || v > max_uV)
112                 return -EINVAL;
113
114         selector <<= WM8994_LDO1_VSEL_SHIFT;
115
116         return wm8994_set_bits(ldo->wm8994, WM8994_LDO_1,
117                                WM8994_LDO1_VSEL_MASK, selector);
118 }
119
120 static struct regulator_ops wm8994_ldo1_ops = {
121         .enable = wm8994_ldo_enable,
122         .disable = wm8994_ldo_disable,
123         .is_enabled = wm8994_ldo_is_enabled,
124         .enable_time = wm8994_ldo_enable_time,
125
126         .list_voltage = wm8994_ldo1_list_voltage,
127         .get_voltage = wm8994_ldo1_get_voltage,
128         .set_voltage = wm8994_ldo1_set_voltage,
129 };
130
131 static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev,
132                                     unsigned int selector)
133 {
134         if (selector > WM8994_LDO2_MAX_SELECTOR)
135                 return -EINVAL;
136
137         return (selector * 100000) + 900000;
138 }
139
140 static int wm8994_ldo2_get_voltage(struct regulator_dev *rdev)
141 {
142         struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
143         int val;
144
145         val = wm8994_reg_read(ldo->wm8994, WM8994_LDO_2);
146         if (val < 0)
147                 return val;
148
149         val = (val & WM8994_LDO2_VSEL_MASK) >> WM8994_LDO2_VSEL_SHIFT;
150
151         return wm8994_ldo2_list_voltage(rdev, val);
152 }
153
154 static int wm8994_ldo2_set_voltage(struct regulator_dev *rdev,
155                                    int min_uV, int max_uV)
156 {
157         struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
158         int selector, v;
159
160         selector = (min_uV - 900000) / 100000;
161         v = wm8994_ldo2_list_voltage(rdev, selector);
162         if (v < 0 || v > max_uV)
163                 return -EINVAL;
164
165         selector <<= WM8994_LDO2_VSEL_SHIFT;
166
167         return wm8994_set_bits(ldo->wm8994, WM8994_LDO_2,
168                                WM8994_LDO2_VSEL_MASK, selector);
169 }
170
171 static struct regulator_ops wm8994_ldo2_ops = {
172         .enable = wm8994_ldo_enable,
173         .disable = wm8994_ldo_disable,
174         .is_enabled = wm8994_ldo_is_enabled,
175         .enable_time = wm8994_ldo_enable_time,
176
177         .list_voltage = wm8994_ldo2_list_voltage,
178         .get_voltage = wm8994_ldo2_get_voltage,
179         .set_voltage = wm8994_ldo2_set_voltage,
180 };
181
182 static struct regulator_desc wm8994_ldo_desc[] = {
183         {
184                 .name = "LDO1",
185                 .id = 1,
186                 .type = REGULATOR_VOLTAGE,
187                 .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
188                 .ops = &wm8994_ldo1_ops,
189                 .owner = THIS_MODULE,
190         },
191         {
192                 .name = "LDO2",
193                 .id = 2,
194                 .type = REGULATOR_VOLTAGE,
195                 .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
196                 .ops = &wm8994_ldo2_ops,
197                 .owner = THIS_MODULE,
198         },
199 };
200
201 static __devinit int wm8994_ldo_probe(struct platform_device *pdev)
202 {
203         struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
204         struct wm8994_pdata *pdata = wm8994->dev->platform_data;
205         int id = pdev->id % ARRAY_SIZE(pdata->ldo);
206         struct wm8994_ldo *ldo;
207         int ret;
208
209         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
210
211         if (!pdata)
212                 return -ENODEV;
213
214         ldo = kzalloc(sizeof(struct wm8994_ldo), GFP_KERNEL);
215         if (ldo == NULL) {
216                 dev_err(&pdev->dev, "Unable to allocate private data\n");
217                 return -ENOMEM;
218         }
219
220         ldo->wm8994 = wm8994;
221
222         ldo->is_enabled = true;
223
224         if (pdata->ldo[id].enable && gpio_is_valid(pdata->ldo[id].enable)) {
225                 ldo->enable = pdata->ldo[id].enable;
226
227                 ret = gpio_request(ldo->enable, "WM8994 LDO enable");
228                 if (ret < 0) {
229                         dev_err(&pdev->dev, "Failed to get enable GPIO: %d\n",
230                                 ret);
231                         goto err;
232                 }
233
234                 ret = gpio_direction_output(ldo->enable, ldo->is_enabled);
235                 if (ret < 0) {
236                         dev_err(&pdev->dev, "Failed to set GPIO up: %d\n",
237                                 ret);
238                         goto err_gpio;
239                 }
240         }
241
242         ldo->regulator = regulator_register(&wm8994_ldo_desc[id], &pdev->dev,
243                                              pdata->ldo[id].init_data, ldo);
244         if (IS_ERR(ldo->regulator)) {
245                 ret = PTR_ERR(ldo->regulator);
246                 dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
247                         id + 1, ret);
248                 goto err_gpio;
249         }
250
251         platform_set_drvdata(pdev, ldo);
252
253         return 0;
254
255 err_gpio:
256         if (gpio_is_valid(ldo->enable))
257                 gpio_free(ldo->enable);
258 err:
259         kfree(ldo);
260         return ret;
261 }
262
263 static __devexit int wm8994_ldo_remove(struct platform_device *pdev)
264 {
265         struct wm8994_ldo *ldo = platform_get_drvdata(pdev);
266
267         platform_set_drvdata(pdev, NULL);
268
269         regulator_unregister(ldo->regulator);
270         if (gpio_is_valid(ldo->enable))
271                 gpio_free(ldo->enable);
272         kfree(ldo);
273
274         return 0;
275 }
276
277 static struct platform_driver wm8994_ldo_driver = {
278         .probe = wm8994_ldo_probe,
279         .remove = __devexit_p(wm8994_ldo_remove),
280         .driver         = {
281                 .name   = "wm8994-ldo",
282                 .owner  = THIS_MODULE,
283         },
284 };
285
286 static int __init wm8994_ldo_init(void)
287 {
288         int ret;
289
290         ret = platform_driver_register(&wm8994_ldo_driver);
291         if (ret != 0)
292                 pr_err("Failed to register Wm8994 GP LDO driver: %d\n", ret);
293
294         return ret;
295 }
296 subsys_initcall(wm8994_ldo_init);
297
298 static void __exit wm8994_ldo_exit(void)
299 {
300         platform_driver_unregister(&wm8994_ldo_driver);
301 }
302 module_exit(wm8994_ldo_exit);
303
304 /* Module information */
305 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
306 MODULE_DESCRIPTION("WM8994 LDO driver");
307 MODULE_LICENSE("GPL");
308 MODULE_ALIAS("platform:wm8994-ldo");