regulator: Update LDO2 for WM8958
[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(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         struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
135
136         if (selector > WM8994_LDO2_MAX_SELECTOR)
137                 return -EINVAL;
138
139         switch (ldo->wm8994->type) {
140         case WM8994:
141                 return (selector * 100000) + 900000;
142         case WM8958:
143                 return (selector * 100000) + 1000000;
144         default:
145                 return -EINVAL;
146         }
147 }
148
149 static int wm8994_ldo2_get_voltage(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         val = (val & WM8994_LDO2_VSEL_MASK) >> WM8994_LDO2_VSEL_SHIFT;
159
160         return wm8994_ldo2_list_voltage(rdev, val);
161 }
162
163 static int wm8994_ldo2_set_voltage(struct regulator_dev *rdev,
164                                    int min_uV, int max_uV)
165 {
166         struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
167         int selector, v;
168
169         switch (ldo->wm8994->type) {
170         case WM8994:
171                 selector = (min_uV - 900000) / 100000;
172                 break;
173         case WM8958:
174                 selector = (min_uV - 1000000) / 100000;
175                 break;
176         default:
177                 return -EINVAL;
178         }
179
180         v = wm8994_ldo2_list_voltage(rdev, selector);
181         if (v < 0 || v > max_uV)
182                 return -EINVAL;
183
184         selector <<= WM8994_LDO2_VSEL_SHIFT;
185
186         return wm8994_set_bits(ldo->wm8994, WM8994_LDO_2,
187                                WM8994_LDO2_VSEL_MASK, selector);
188 }
189
190 static struct regulator_ops wm8994_ldo2_ops = {
191         .enable = wm8994_ldo_enable,
192         .disable = wm8994_ldo_disable,
193         .is_enabled = wm8994_ldo_is_enabled,
194         .enable_time = wm8994_ldo_enable_time,
195
196         .list_voltage = wm8994_ldo2_list_voltage,
197         .get_voltage = wm8994_ldo2_get_voltage,
198         .set_voltage = wm8994_ldo2_set_voltage,
199 };
200
201 static struct regulator_desc wm8994_ldo_desc[] = {
202         {
203                 .name = "LDO1",
204                 .id = 1,
205                 .type = REGULATOR_VOLTAGE,
206                 .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
207                 .ops = &wm8994_ldo1_ops,
208                 .owner = THIS_MODULE,
209         },
210         {
211                 .name = "LDO2",
212                 .id = 2,
213                 .type = REGULATOR_VOLTAGE,
214                 .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
215                 .ops = &wm8994_ldo2_ops,
216                 .owner = THIS_MODULE,
217         },
218 };
219
220 static __devinit int wm8994_ldo_probe(struct platform_device *pdev)
221 {
222         struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
223         struct wm8994_pdata *pdata = wm8994->dev->platform_data;
224         int id = pdev->id % ARRAY_SIZE(pdata->ldo);
225         struct wm8994_ldo *ldo;
226         int ret;
227
228         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
229
230         if (!pdata)
231                 return -ENODEV;
232
233         ldo = kzalloc(sizeof(struct wm8994_ldo), GFP_KERNEL);
234         if (ldo == NULL) {
235                 dev_err(&pdev->dev, "Unable to allocate private data\n");
236                 return -ENOMEM;
237         }
238
239         ldo->wm8994 = wm8994;
240
241         if (pdata->ldo[id].enable && gpio_is_valid(pdata->ldo[id].enable)) {
242                 ldo->enable = pdata->ldo[id].enable;
243
244                 ret = gpio_request(ldo->enable, "WM8994 LDO enable");
245                 if (ret < 0) {
246                         dev_err(&pdev->dev, "Failed to get enable GPIO: %d\n",
247                                 ret);
248                         goto err;
249                 }
250
251                 ret = gpio_direction_output(ldo->enable, ldo->is_enabled);
252                 if (ret < 0) {
253                         dev_err(&pdev->dev, "Failed to set GPIO up: %d\n",
254                                 ret);
255                         goto err_gpio;
256                 }
257         } else
258                 ldo->is_enabled = true;
259
260         ldo->regulator = regulator_register(&wm8994_ldo_desc[id], &pdev->dev,
261                                              pdata->ldo[id].init_data, ldo);
262         if (IS_ERR(ldo->regulator)) {
263                 ret = PTR_ERR(ldo->regulator);
264                 dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
265                         id + 1, ret);
266                 goto err_gpio;
267         }
268
269         platform_set_drvdata(pdev, ldo);
270
271         return 0;
272
273 err_gpio:
274         if (gpio_is_valid(ldo->enable))
275                 gpio_free(ldo->enable);
276 err:
277         kfree(ldo);
278         return ret;
279 }
280
281 static __devexit int wm8994_ldo_remove(struct platform_device *pdev)
282 {
283         struct wm8994_ldo *ldo = platform_get_drvdata(pdev);
284
285         platform_set_drvdata(pdev, NULL);
286
287         regulator_unregister(ldo->regulator);
288         if (gpio_is_valid(ldo->enable))
289                 gpio_free(ldo->enable);
290         kfree(ldo);
291
292         return 0;
293 }
294
295 static struct platform_driver wm8994_ldo_driver = {
296         .probe = wm8994_ldo_probe,
297         .remove = __devexit_p(wm8994_ldo_remove),
298         .driver         = {
299                 .name   = "wm8994-ldo",
300                 .owner  = THIS_MODULE,
301         },
302 };
303
304 static int __init wm8994_ldo_init(void)
305 {
306         int ret;
307
308         ret = platform_driver_register(&wm8994_ldo_driver);
309         if (ret != 0)
310                 pr_err("Failed to register Wm8994 GP LDO driver: %d\n", ret);
311
312         return ret;
313 }
314 subsys_initcall(wm8994_ldo_init);
315
316 static void __exit wm8994_ldo_exit(void)
317 {
318         platform_driver_unregister(&wm8994_ldo_driver);
319 }
320 module_exit(wm8994_ldo_exit);
321
322 /* Module information */
323 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
324 MODULE_DESCRIPTION("WM8994 LDO driver");
325 MODULE_LICENSE("GPL");
326 MODULE_ALIAS("platform:wm8994-ldo");