arch: arm: regulator: Fix LDK kernel build break
[linux-2.6.git] / drivers / regulator / wm831x-isink.c
1 /*
2  * wm831x-isink.c  --  Current sink driver for the WM831x series
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/i2c.h>
20 #include <linux/platform_device.h>
21 #include <linux/regulator/driver.h>
22 #include <linux/slab.h>
23
24 #include <linux/mfd/wm831x/core.h>
25 #include <linux/mfd/wm831x/regulator.h>
26 #include <linux/mfd/wm831x/pdata.h>
27
28 #define WM831X_ISINK_MAX_NAME 7
29
30 struct wm831x_isink {
31         char name[WM831X_ISINK_MAX_NAME];
32         struct regulator_desc desc;
33         int reg;
34         struct wm831x *wm831x;
35         struct regulator_dev *regulator;
36 };
37
38 static int wm831x_isink_enable(struct regulator_dev *rdev)
39 {
40         struct wm831x_isink *isink = rdev_get_drvdata(rdev);
41         struct wm831x *wm831x = isink->wm831x;
42         int ret;
43
44         /* We have a two stage enable: first start the ISINK... */
45         ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA,
46                               WM831X_CS1_ENA);
47         if (ret != 0)
48                 return ret;
49
50         /* ...then enable drive */
51         ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_DRIVE,
52                               WM831X_CS1_DRIVE);
53         if (ret != 0)
54                 wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA, 0);
55
56         return ret;
57
58 }
59
60 static int wm831x_isink_disable(struct regulator_dev *rdev)
61 {
62         struct wm831x_isink *isink = rdev_get_drvdata(rdev);
63         struct wm831x *wm831x = isink->wm831x;
64         int ret;
65
66         ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_DRIVE, 0);
67         if (ret < 0)
68                 return ret;
69
70         ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA, 0);
71         if (ret < 0)
72                 return ret;
73
74         return ret;
75
76 }
77
78 static int wm831x_isink_is_enabled(struct regulator_dev *rdev)
79 {
80         struct wm831x_isink *isink = rdev_get_drvdata(rdev);
81         struct wm831x *wm831x = isink->wm831x;
82         int ret;
83
84         ret = wm831x_reg_read(wm831x, isink->reg);
85         if (ret < 0)
86                 return ret;
87
88         if ((ret & (WM831X_CS1_ENA | WM831X_CS1_DRIVE)) ==
89             (WM831X_CS1_ENA | WM831X_CS1_DRIVE))
90                 return 1;
91         else
92                 return 0;
93 }
94
95 static int wm831x_isink_set_current(struct regulator_dev *rdev,
96                                     int min_uA, int max_uA)
97 {
98         struct wm831x_isink *isink = rdev_get_drvdata(rdev);
99         struct wm831x *wm831x = isink->wm831x;
100         int ret, i;
101
102         for (i = 0; i < ARRAY_SIZE(wm831x_isinkv_values); i++) {
103                 int val = wm831x_isinkv_values[i];
104                 if (min_uA >= val && val <= max_uA) {
105                         ret = wm831x_set_bits(wm831x, isink->reg,
106                                               WM831X_CS1_ISEL_MASK, i);
107                         return ret;
108                 }
109         }
110
111         return -EINVAL;
112 }
113
114 static int wm831x_isink_get_current(struct regulator_dev *rdev)
115 {
116         struct wm831x_isink *isink = rdev_get_drvdata(rdev);
117         struct wm831x *wm831x = isink->wm831x;
118         int ret;
119
120         ret = wm831x_reg_read(wm831x, isink->reg);
121         if (ret < 0)
122                 return ret;
123
124         ret &= WM831X_CS1_ISEL_MASK;
125         if (ret > WM831X_ISINK_MAX_ISEL)
126                 ret = WM831X_ISINK_MAX_ISEL;
127
128         return wm831x_isinkv_values[ret];
129 }
130
131 static struct regulator_ops wm831x_isink_ops = {
132         .is_enabled = wm831x_isink_is_enabled,
133         .enable = wm831x_isink_enable,
134         .disable = wm831x_isink_disable,
135         .set_current_limit = wm831x_isink_set_current,
136         .get_current_limit = wm831x_isink_get_current,
137 };
138
139 static irqreturn_t wm831x_isink_irq(int irq, void *data)
140 {
141         struct wm831x_isink *isink = data;
142
143         regulator_notifier_call_chain(isink->regulator,
144                                       REGULATOR_EVENT_OVER_CURRENT,
145                                       NULL);
146
147         return IRQ_HANDLED;
148 }
149
150
151 static __devinit int wm831x_isink_probe(struct platform_device *pdev)
152 {
153         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
154         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
155         struct wm831x_isink *isink;
156         int id = pdev->id % ARRAY_SIZE(pdata->isink);
157         struct resource *res;
158         int ret, irq;
159
160         dev_dbg(&pdev->dev, "Probing ISINK%d\n", id + 1);
161
162         if (pdata == NULL || pdata->isink[id] == NULL)
163                 return -ENODEV;
164
165         isink = kzalloc(sizeof(struct wm831x_isink), GFP_KERNEL);
166         if (isink == NULL) {
167                 dev_err(&pdev->dev, "Unable to allocate private data\n");
168                 return -ENOMEM;
169         }
170
171         isink->wm831x = wm831x;
172
173         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
174         if (res == NULL) {
175                 dev_err(&pdev->dev, "No I/O resource\n");
176                 ret = -EINVAL;
177                 goto err;
178         }
179         isink->reg = res->start;
180
181         /* For current parts this is correct; probably need to revisit
182          * in future.
183          */
184         snprintf(isink->name, sizeof(isink->name), "ISINK%d", id + 1);
185         isink->desc.name = isink->name;
186         isink->desc.id = id;
187         isink->desc.ops = &wm831x_isink_ops;
188         isink->desc.type = REGULATOR_CURRENT;
189         isink->desc.owner = THIS_MODULE;
190
191         isink->regulator = regulator_register(&isink->desc, &pdev->dev,
192                                              pdata->isink[id], isink);
193         if (IS_ERR(isink->regulator)) {
194                 ret = PTR_ERR(isink->regulator);
195                 dev_err(wm831x->dev, "Failed to register ISINK%d: %d\n",
196                         id + 1, ret);
197                 goto err;
198         }
199
200         irq = platform_get_irq(pdev, 0);
201         ret = request_threaded_irq(irq, NULL, wm831x_isink_irq,
202                                    IRQF_TRIGGER_RISING, isink->name, isink);
203         if (ret != 0) {
204                 dev_err(&pdev->dev, "Failed to request ISINK IRQ %d: %d\n",
205                         irq, ret);
206                 goto err_regulator;
207         }
208
209         platform_set_drvdata(pdev, isink);
210
211         return 0;
212
213 err_regulator:
214         regulator_unregister(isink->regulator);
215 err:
216         kfree(isink);
217         return ret;
218 }
219
220 static __devexit int wm831x_isink_remove(struct platform_device *pdev)
221 {
222         struct wm831x_isink *isink = platform_get_drvdata(pdev);
223
224         platform_set_drvdata(pdev, NULL);
225
226         free_irq(platform_get_irq(pdev, 0), isink);
227
228         regulator_unregister(isink->regulator);
229         kfree(isink);
230
231         return 0;
232 }
233
234 static struct platform_driver wm831x_isink_driver = {
235         .probe = wm831x_isink_probe,
236         .remove = __devexit_p(wm831x_isink_remove),
237         .driver         = {
238                 .name   = "wm831x-isink",
239                 .owner  = THIS_MODULE,
240         },
241 };
242
243 static int __init wm831x_isink_init(void)
244 {
245         int ret;
246         ret = platform_driver_register(&wm831x_isink_driver);
247         if (ret != 0)
248                 pr_err("Failed to register WM831x ISINK driver: %d\n", ret);
249
250         return ret;
251 }
252 subsys_initcall(wm831x_isink_init);
253
254 static void __exit wm831x_isink_exit(void)
255 {
256         platform_driver_unregister(&wm831x_isink_driver);
257 }
258 module_exit(wm831x_isink_exit);
259
260 /* Module information */
261 MODULE_AUTHOR("Mark Brown");
262 MODULE_DESCRIPTION("WM831x current sink driver");
263 MODULE_LICENSE("GPL");
264 MODULE_ALIAS("platform:wm831x-isink");