regulator: palmas: fix build warnings
[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_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 int wm8994_ldo1_get_voltage_sel(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         return (val & WM8994_LDO1_VSEL_MASK) >> WM8994_LDO1_VSEL_SHIFT;
99 }
100
101 static int wm8994_ldo1_set_voltage(struct regulator_dev *rdev,
102                                    int min_uV, int max_uV, unsigned *s)
103 {
104         struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
105         int selector, v;
106
107         selector = (min_uV - 2400000) / 100000;
108         v = wm8994_ldo1_list_voltage(rdev, selector);
109         if (v < 0 || v > max_uV)
110                 return -EINVAL;
111
112         *s = selector;
113         selector <<= WM8994_LDO1_VSEL_SHIFT;
114
115         return wm8994_set_bits(ldo->wm8994, WM8994_LDO_1,
116                                WM8994_LDO1_VSEL_MASK, selector);
117 }
118
119 static struct regulator_ops wm8994_ldo1_ops = {
120         .enable = wm8994_ldo_enable,
121         .disable = wm8994_ldo_disable,
122         .is_enabled = wm8994_ldo_is_enabled,
123         .enable_time = wm8994_ldo_enable_time,
124
125         .list_voltage = wm8994_ldo1_list_voltage,
126         .get_voltage_sel = wm8994_ldo1_get_voltage_sel,
127         .set_voltage = wm8994_ldo1_set_voltage,
128 };
129
130 static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev,
131                                     unsigned int selector)
132 {
133         struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
134
135         if (selector > WM8994_LDO2_MAX_SELECTOR)
136                 return -EINVAL;
137
138         switch (ldo->wm8994->type) {
139         case WM8994:
140                 return (selector * 100000) + 900000;
141         case WM8958:
142                 return (selector * 100000) + 1000000;
143         case WM1811:
144                 switch (selector) {
145                 case 0:
146                         return -EINVAL;
147                 default:
148                         return (selector * 100000) + 950000;
149                 }
150                 break;
151         default:
152                 return -EINVAL;
153         }
154 }
155
156 static int wm8994_ldo2_get_voltage_sel(struct regulator_dev *rdev)
157 {
158         struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
159         int val;
160
161         val = wm8994_reg_read(ldo->wm8994, WM8994_LDO_2);
162         if (val < 0)
163                 return val;
164
165         return (val & WM8994_LDO2_VSEL_MASK) >> WM8994_LDO2_VSEL_SHIFT;
166 }
167
168 static int wm8994_ldo2_set_voltage(struct regulator_dev *rdev,
169                                    int min_uV, int max_uV, unsigned *s)
170 {
171         struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
172         int selector, v;
173
174         switch (ldo->wm8994->type) {
175         case WM8994:
176                 selector = (min_uV - 900000) / 100000;
177                 break;
178         case WM8958:
179                 selector = (min_uV - 1000000) / 100000;
180                 break;
181         case WM1811:
182                 selector = (min_uV - 950000) / 100000;
183                 if (selector == 0)
184                         selector = 1;
185                 break;
186         default:
187                 return -EINVAL;
188         }
189
190         v = wm8994_ldo2_list_voltage(rdev, selector);
191         if (v < 0 || v > max_uV)
192                 return -EINVAL;
193
194         *s = selector;
195         selector <<= WM8994_LDO2_VSEL_SHIFT;
196
197         return wm8994_set_bits(ldo->wm8994, WM8994_LDO_2,
198                                WM8994_LDO2_VSEL_MASK, selector);
199 }
200
201 static struct regulator_ops wm8994_ldo2_ops = {
202         .enable = wm8994_ldo_enable,
203         .disable = wm8994_ldo_disable,
204         .is_enabled = wm8994_ldo_is_enabled,
205         .enable_time = wm8994_ldo_enable_time,
206
207         .list_voltage = wm8994_ldo2_list_voltage,
208         .get_voltage_sel = wm8994_ldo2_get_voltage_sel,
209         .set_voltage = wm8994_ldo2_set_voltage,
210 };
211
212 static struct regulator_desc wm8994_ldo_desc[] = {
213         {
214                 .name = "LDO1",
215                 .id = 1,
216                 .type = REGULATOR_VOLTAGE,
217                 .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
218                 .ops = &wm8994_ldo1_ops,
219                 .owner = THIS_MODULE,
220         },
221         {
222                 .name = "LDO2",
223                 .id = 2,
224                 .type = REGULATOR_VOLTAGE,
225                 .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
226                 .ops = &wm8994_ldo2_ops,
227                 .owner = THIS_MODULE,
228         },
229 };
230
231 static __devinit int wm8994_ldo_probe(struct platform_device *pdev)
232 {
233         struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
234         struct wm8994_pdata *pdata = wm8994->dev->platform_data;
235         int id = pdev->id % ARRAY_SIZE(pdata->ldo);
236         struct wm8994_ldo *ldo;
237         int ret;
238
239         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
240
241         if (!pdata)
242                 return -ENODEV;
243
244         ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL);
245         if (ldo == NULL) {
246                 dev_err(&pdev->dev, "Unable to allocate private data\n");
247                 return -ENOMEM;
248         }
249
250         ldo->wm8994 = wm8994;
251
252         if (pdata->ldo[id].enable && gpio_is_valid(pdata->ldo[id].enable)) {
253                 ldo->enable = pdata->ldo[id].enable;
254
255                 ret = gpio_request(ldo->enable, "WM8994 LDO enable");
256                 if (ret < 0) {
257                         dev_err(&pdev->dev, "Failed to get enable GPIO: %d\n",
258                                 ret);
259                         goto err;
260                 }
261
262                 ret = gpio_direction_output(ldo->enable, ldo->is_enabled);
263                 if (ret < 0) {
264                         dev_err(&pdev->dev, "Failed to set GPIO up: %d\n",
265                                 ret);
266                         goto err_gpio;
267                 }
268         } else
269                 ldo->is_enabled = true;
270
271         ldo->regulator = regulator_register(&wm8994_ldo_desc[id], &pdev->dev,
272                                              pdata->ldo[id].init_data, ldo, NULL);
273         if (IS_ERR(ldo->regulator)) {
274                 ret = PTR_ERR(ldo->regulator);
275                 dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
276                         id + 1, ret);
277                 goto err_gpio;
278         }
279
280         platform_set_drvdata(pdev, ldo);
281
282         return 0;
283
284 err_gpio:
285         if (gpio_is_valid(ldo->enable))
286                 gpio_free(ldo->enable);
287 err:
288         return ret;
289 }
290
291 static __devexit int wm8994_ldo_remove(struct platform_device *pdev)
292 {
293         struct wm8994_ldo *ldo = platform_get_drvdata(pdev);
294
295         platform_set_drvdata(pdev, NULL);
296
297         regulator_unregister(ldo->regulator);
298         if (gpio_is_valid(ldo->enable))
299                 gpio_free(ldo->enable);
300
301         return 0;
302 }
303
304 static struct platform_driver wm8994_ldo_driver = {
305         .probe = wm8994_ldo_probe,
306         .remove = __devexit_p(wm8994_ldo_remove),
307         .driver         = {
308                 .name   = "wm8994-ldo",
309                 .owner  = THIS_MODULE,
310         },
311 };
312
313 static int __init wm8994_ldo_init(void)
314 {
315         int ret;
316
317         ret = platform_driver_register(&wm8994_ldo_driver);
318         if (ret != 0)
319                 pr_err("Failed to register Wm8994 GP LDO driver: %d\n", ret);
320
321         return ret;
322 }
323 subsys_initcall(wm8994_ldo_init);
324
325 static void __exit wm8994_ldo_exit(void)
326 {
327         platform_driver_unregister(&wm8994_ldo_driver);
328 }
329 module_exit(wm8994_ldo_exit);
330
331 /* Module information */
332 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
333 MODULE_DESCRIPTION("WM8994 LDO driver");
334 MODULE_LICENSE("GPL");
335 MODULE_ALIAS("platform:wm8994-ldo");