blob: 48857008758cc96248b38cccc24a05754bd5197d [file] [log] [blame]
Mark Brownd4d6b722009-07-28 15:23:46 +01001/*
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
23#include <linux/mfd/wm831x/core.h>
24#include <linux/mfd/wm831x/regulator.h>
25#include <linux/mfd/wm831x/pdata.h>
26
27#define WM831X_ISINK_MAX_NAME 7
28
29struct wm831x_isink {
30 char name[WM831X_ISINK_MAX_NAME];
31 struct regulator_desc desc;
32 int reg;
33 struct wm831x *wm831x;
34 struct regulator_dev *regulator;
35};
36
37static int wm831x_isink_enable(struct regulator_dev *rdev)
38{
39 struct wm831x_isink *isink = rdev_get_drvdata(rdev);
40 struct wm831x *wm831x = isink->wm831x;
41 int ret;
42
43 /* We have a two stage enable: first start the ISINK... */
44 ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA,
45 WM831X_CS1_ENA);
46 if (ret != 0)
47 return ret;
48
49 /* ...then enable drive */
50 ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_DRIVE,
51 WM831X_CS1_DRIVE);
52 if (ret != 0)
53 wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA, 0);
54
55 return ret;
56
57}
58
59static int wm831x_isink_disable(struct regulator_dev *rdev)
60{
61 struct wm831x_isink *isink = rdev_get_drvdata(rdev);
62 struct wm831x *wm831x = isink->wm831x;
63 int ret;
64
65 ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_DRIVE, 0);
66 if (ret < 0)
67 return ret;
68
69 ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA, 0);
70 if (ret < 0)
71 return ret;
72
73 return ret;
74
75}
76
77static int wm831x_isink_is_enabled(struct regulator_dev *rdev)
78{
79 struct wm831x_isink *isink = rdev_get_drvdata(rdev);
80 struct wm831x *wm831x = isink->wm831x;
81 int ret;
82
83 ret = wm831x_reg_read(wm831x, isink->reg);
84 if (ret < 0)
85 return ret;
86
87 if ((ret & (WM831X_CS1_ENA | WM831X_CS1_DRIVE)) ==
88 (WM831X_CS1_ENA | WM831X_CS1_DRIVE))
89 return 1;
90 else
91 return 0;
92}
93
94static int wm831x_isink_set_current(struct regulator_dev *rdev,
95 int min_uA, int max_uA)
96{
97 struct wm831x_isink *isink = rdev_get_drvdata(rdev);
98 struct wm831x *wm831x = isink->wm831x;
99 int ret, i;
100
101 for (i = 0; i < ARRAY_SIZE(wm831x_isinkv_values); i++) {
102 int val = wm831x_isinkv_values[i];
103 if (min_uA >= val && val <= max_uA) {
104 ret = wm831x_set_bits(wm831x, isink->reg,
105 WM831X_CS1_ISEL_MASK, i);
106 return ret;
107 }
108 }
109
110 return -EINVAL;
111}
112
113static int wm831x_isink_get_current(struct regulator_dev *rdev)
114{
115 struct wm831x_isink *isink = rdev_get_drvdata(rdev);
116 struct wm831x *wm831x = isink->wm831x;
117 int ret;
118
119 ret = wm831x_reg_read(wm831x, isink->reg);
120 if (ret < 0)
121 return ret;
122
123 ret &= WM831X_CS1_ISEL_MASK;
124 if (ret > WM831X_ISINK_MAX_ISEL)
125 ret = WM831X_ISINK_MAX_ISEL;
126
127 return wm831x_isinkv_values[ret];
128}
129
130static struct regulator_ops wm831x_isink_ops = {
131 .is_enabled = wm831x_isink_is_enabled,
132 .enable = wm831x_isink_enable,
133 .disable = wm831x_isink_disable,
134 .set_current_limit = wm831x_isink_set_current,
135 .get_current_limit = wm831x_isink_get_current,
136};
137
138static irqreturn_t wm831x_isink_irq(int irq, void *data)
139{
140 struct wm831x_isink *isink = data;
141
142 regulator_notifier_call_chain(isink->regulator,
143 REGULATOR_EVENT_OVER_CURRENT,
144 NULL);
145
146 return IRQ_HANDLED;
147}
148
149
150static __devinit int wm831x_isink_probe(struct platform_device *pdev)
151{
152 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
153 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
154 struct wm831x_isink *isink;
155 int id = pdev->id % ARRAY_SIZE(pdata->isink);
156 struct resource *res;
157 int ret, irq;
158
159 dev_dbg(&pdev->dev, "Probing ISINK%d\n", id + 1);
160
161 if (pdata == NULL || pdata->isink[id] == NULL)
162 return -ENODEV;
163
164 isink = kzalloc(sizeof(struct wm831x_isink), GFP_KERNEL);
165 if (isink == NULL) {
166 dev_err(&pdev->dev, "Unable to allocate private data\n");
167 return -ENOMEM;
168 }
169
Mark Browne8092da2009-11-30 14:01:56 +0000170 isink->wm831x = wm831x;
171
Mark Brownd4d6b722009-07-28 15:23:46 +0100172 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
173 if (res == NULL) {
174 dev_err(&pdev->dev, "No I/O resource\n");
175 ret = -EINVAL;
176 goto err;
177 }
178 isink->reg = res->start;
179
180 /* For current parts this is correct; probably need to revisit
181 * in future.
182 */
183 snprintf(isink->name, sizeof(isink->name), "ISINK%d", id + 1);
184 isink->desc.name = isink->name;
185 isink->desc.id = id;
186 isink->desc.ops = &wm831x_isink_ops;
187 isink->desc.type = REGULATOR_CURRENT;
188 isink->desc.owner = THIS_MODULE;
189
190 isink->regulator = regulator_register(&isink->desc, &pdev->dev,
191 pdata->isink[id], isink);
192 if (IS_ERR(isink->regulator)) {
193 ret = PTR_ERR(isink->regulator);
194 dev_err(wm831x->dev, "Failed to register ISINK%d: %d\n",
195 id + 1, ret);
196 goto err;
197 }
198
199 irq = platform_get_irq(pdev, 0);
200 ret = wm831x_request_irq(wm831x, irq, wm831x_isink_irq,
201 IRQF_TRIGGER_RISING, isink->name,
202 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
213err_regulator:
214 regulator_unregister(isink->regulator);
215err:
216 kfree(isink);
217 return ret;
218}
219
220static __devexit int wm831x_isink_remove(struct platform_device *pdev)
221{
222 struct wm831x_isink *isink = platform_get_drvdata(pdev);
223 struct wm831x *wm831x = isink->wm831x;
224
225 wm831x_free_irq(wm831x, platform_get_irq(pdev, 0), isink);
226
227 regulator_unregister(isink->regulator);
228 kfree(isink);
229
230 return 0;
231}
232
233static struct platform_driver wm831x_isink_driver = {
234 .probe = wm831x_isink_probe,
235 .remove = __devexit_p(wm831x_isink_remove),
236 .driver = {
237 .name = "wm831x-isink",
238 },
239};
240
241static int __init wm831x_isink_init(void)
242{
243 int ret;
244 ret = platform_driver_register(&wm831x_isink_driver);
245 if (ret != 0)
246 pr_err("Failed to register WM831x ISINK driver: %d\n", ret);
247
248 return ret;
249}
250subsys_initcall(wm831x_isink_init);
251
252static void __exit wm831x_isink_exit(void)
253{
254 platform_driver_unregister(&wm831x_isink_driver);
255}
256module_exit(wm831x_isink_exit);
257
258/* Module information */
259MODULE_AUTHOR("Mark Brown");
260MODULE_DESCRIPTION("WM831x current sink driver");
261MODULE_LICENSE("GPL");
262MODULE_ALIAS("platform:wm831x-isink");