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