Root/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
30struct 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
38static 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
60static 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
78static 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
95static 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
114static 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
131static 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
139static 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
151static __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 regulator_config config = { };
158    struct resource *res;
159    int ret, irq;
160
161    dev_dbg(&pdev->dev, "Probing ISINK%d\n", id + 1);
162
163    if (pdata == NULL || pdata->isink[id] == NULL)
164        return -ENODEV;
165
166    isink = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_isink),
167                 GFP_KERNEL);
168    if (isink == NULL) {
169        dev_err(&pdev->dev, "Unable to allocate private data\n");
170        return -ENOMEM;
171    }
172
173    isink->wm831x = wm831x;
174
175    res = platform_get_resource(pdev, IORESOURCE_IO, 0);
176    if (res == NULL) {
177        dev_err(&pdev->dev, "No I/O resource\n");
178        ret = -EINVAL;
179        goto err;
180    }
181    isink->reg = res->start;
182
183    /* For current parts this is correct; probably need to revisit
184     * in future.
185     */
186    snprintf(isink->name, sizeof(isink->name), "ISINK%d", id + 1);
187    isink->desc.name = isink->name;
188    isink->desc.id = id;
189    isink->desc.ops = &wm831x_isink_ops;
190    isink->desc.type = REGULATOR_CURRENT;
191    isink->desc.owner = THIS_MODULE;
192
193    config.dev = pdev->dev.parent;
194    config.init_data = pdata->isink[id];
195    config.driver_data = isink;
196
197    isink->regulator = regulator_register(&isink->desc, &config);
198    if (IS_ERR(isink->regulator)) {
199        ret = PTR_ERR(isink->regulator);
200        dev_err(wm831x->dev, "Failed to register ISINK%d: %d\n",
201            id + 1, ret);
202        goto err;
203    }
204
205    irq = wm831x_irq(wm831x, platform_get_irq(pdev, 0));
206    ret = request_threaded_irq(irq, NULL, wm831x_isink_irq,
207                   IRQF_TRIGGER_RISING, isink->name, isink);
208    if (ret != 0) {
209        dev_err(&pdev->dev, "Failed to request ISINK IRQ %d: %d\n",
210            irq, ret);
211        goto err_regulator;
212    }
213
214    platform_set_drvdata(pdev, isink);
215
216    return 0;
217
218err_regulator:
219    regulator_unregister(isink->regulator);
220err:
221    return ret;
222}
223
224static __devexit int wm831x_isink_remove(struct platform_device *pdev)
225{
226    struct wm831x_isink *isink = platform_get_drvdata(pdev);
227
228    platform_set_drvdata(pdev, NULL);
229
230    free_irq(wm831x_irq(isink->wm831x, platform_get_irq(pdev, 0)), isink);
231
232    regulator_unregister(isink->regulator);
233
234    return 0;
235}
236
237static struct platform_driver wm831x_isink_driver = {
238    .probe = wm831x_isink_probe,
239    .remove = __devexit_p(wm831x_isink_remove),
240    .driver = {
241        .name = "wm831x-isink",
242        .owner = THIS_MODULE,
243    },
244};
245
246static int __init wm831x_isink_init(void)
247{
248    int ret;
249    ret = platform_driver_register(&wm831x_isink_driver);
250    if (ret != 0)
251        pr_err("Failed to register WM831x ISINK driver: %d\n", ret);
252
253    return ret;
254}
255subsys_initcall(wm831x_isink_init);
256
257static void __exit wm831x_isink_exit(void)
258{
259    platform_driver_unregister(&wm831x_isink_driver);
260}
261module_exit(wm831x_isink_exit);
262
263/* Module information */
264MODULE_AUTHOR("Mark Brown");
265MODULE_DESCRIPTION("WM831x current sink driver");
266MODULE_LICENSE("GPL");
267MODULE_ALIAS("platform:wm831x-isink");
268

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