regulator: wm8994: Convert to set_voltage_sel()
[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_sel(struct regulator_dev *rdev,
102                                        unsigned selector)
103 {
104         struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
105
106         selector <<= WM8994_LDO1_VSEL_SHIFT;
107
108         return wm8994_set_bits(ldo->wm8994, WM8994_LDO_1,
109                                WM8994_LDO1_VSEL_MASK, selector);
110 }
111
112 static struct regulator_ops wm8994_ldo1_ops = {
113         .enable = wm8994_ldo_enable,
114         .disable = wm8994_ldo_disable,
115         .is_enabled = wm8994_ldo_is_enabled,
116         .enable_time = wm8994_ldo_enable_time,
117
118         .list_voltage = wm8994_ldo1_list_voltage,
119         .get_voltage_sel = wm8994_ldo1_get_voltage_sel,
120         .set_voltage_sel = wm8994_ldo1_set_voltage_sel,
121 };
122
123 static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev,
124                                     unsigned int selector)
125 {
126         struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
127
128         if (selector > WM8994_LDO2_MAX_SELECTOR)
129                 return -EINVAL;
130
131         switch (ldo->wm8994->type) {
132         case WM8994:
133                 return (selector * 100000) + 900000;
134         case WM8958:
135                 return (selector * 100000) + 1000000;
136         case WM1811:
137                 switch (selector) {
138                 case 0:
139                         return -EINVAL;
140                 default:
141                         return (selector * 100000) + 950000;
142                 }
143                 break;
144         default:
145                 return -EINVAL;
146         }
147 }
148
149 static int wm8994_ldo2_get_voltage_sel(struct regulator_dev *rdev)
150 {
151         struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
152         int val;
153
154         val = wm8994_reg_read(ldo->wm8994, WM8994_LDO_2);
155         if (val < 0)
156                 return val;
157
158         return (val & WM8994_LDO2_VSEL_MASK) >> WM8994_LDO2_VSEL_SHIFT;
159 }
160
161 static int wm8994_ldo2_set_voltage_sel(struct regulator_dev *rdev,
162                                        unsigned selector)
163 {
164         struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
165
166         selector <<= WM8994_LDO2_VSEL_SHIFT;
167
168         return wm8994_set_bits(ldo->wm8994, WM8994_LDO_2,
169                                WM8994_LDO2_VSEL_MASK, selector);
170 }
171
172 static struct regulator_ops wm8994_ldo2_ops = {
173         .enable = wm8994_ldo_enable,
174         .disable = wm8994_ldo_disable,
175         .is_enabled = wm8994_ldo_is_enabled,
176         .enable_time = wm8994_ldo_enable_time,
177
178         .list_voltage = wm8994_ldo2_list_voltage,
179         .get_voltage_sel = wm8994_ldo2_get_voltage_sel,
180         .set_voltage_sel = wm8994_ldo2_set_voltage_sel,
181 };
182
183 static const struct regulator_desc wm8994_ldo_desc[] = {
184         {
185                 .name = "LDO1",
186                 .id = 1,
187                 .type = REGULATOR_VOLTAGE,
188                 .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
189                 .ops = &wm8994_ldo1_ops,
190                 .owner = THIS_MODULE,
191         },
192         {
193                 .name = "LDO2",
194                 .id = 2,
195                 .type = REGULATOR_VOLTAGE,
196                 .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
197                 .ops = &wm8994_ldo2_ops,
198                 .owner = THIS_MODULE,
199         },
200 };
201
202 static __devinit int wm8994_ldo_probe(struct platform_device *pdev)
203 {
204         struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
205         struct wm8994_pdata *pdata = wm8994->dev->platform_data;
206         int id = pdev->id % ARRAY_SIZE(pdata->ldo);
207         struct regulator_config config = { };
208         struct wm8994_ldo *ldo;
209         int ret;
210
211         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
212
213         if (!pdata)
214                 return -ENODEV;
215
216         ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL);
217         if (ldo == NULL) {
218                 dev_err(&pdev->dev, "Unable to allocate private data\n");
219                 return -ENOMEM;
220         }
221
222         ldo->wm8994 = wm8994;
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         } else
241                 ldo->is_enabled = true;
242
243         config.dev = &pdev->dev;
244         config.init_data = pdata->ldo[id].init_data;
245         config.driver_data = ldo;
246
247         ldo->regulator = regulator_register(&wm8994_ldo_desc[id], &config);
248         if (IS_ERR(ldo->regulator)) {
249                 ret = PTR_ERR(ldo->regulator);
250                 dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
251                         id + 1, ret);
252                 goto err_gpio;
253         }
254
255         platform_set_drvdata(pdev, ldo);
256
257         return 0;
258
259 err_gpio:
260         if (gpio_is_valid(ldo->enable))
261                 gpio_free(ldo->enable);
262 err:
263         return ret;
264 }
265
266 static __devexit int wm8994_ldo_remove(struct platform_device *pdev)
267 {
268         struct wm8994_ldo *ldo = platform_get_drvdata(pdev);
269
270         platform_set_drvdata(pdev, NULL);
271
272         regulator_unregister(ldo->regulator);
273         if (gpio_is_valid(ldo->enable))
274                 gpio_free(ldo->enable);
275
276         return 0;
277 }
278
279 static struct platform_driver wm8994_ldo_driver = {
280         .probe = wm8994_ldo_probe,
281         .remove = __devexit_p(wm8994_ldo_remove),
282         .driver         = {
283                 .name   = "wm8994-ldo",
284                 .owner  = THIS_MODULE,
285         },
286 };
287
288 static int __init wm8994_ldo_init(void)
289 {
290         int ret;
291
292         ret = platform_driver_register(&wm8994_ldo_driver);
293         if (ret != 0)
294                 pr_err("Failed to register Wm8994 GP LDO driver: %d\n", ret);
295
296         return ret;
297 }
298 subsys_initcall(wm8994_ldo_init);
299
300 static void __exit wm8994_ldo_exit(void)
301 {
302         platform_driver_unregister(&wm8994_ldo_driver);
303 }
304 module_exit(wm8994_ldo_exit);
305
306 /* Module information */
307 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
308 MODULE_DESCRIPTION("WM8994 LDO driver");
309 MODULE_LICENSE("GPL");
310 MODULE_ALIAS("platform:wm8994-ldo");