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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
45 ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA,
46 WM831X_CS1_ENA);
47 if (ret != 0)
48 return ret;
49
50
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 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
182
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 = wm831x_request_irq(wm831x, irq, wm831x_isink_irq,
202 IRQF_TRIGGER_RISING, isink->name,
203 isink);
204 if (ret != 0) {
205 dev_err(&pdev->dev, "Failed to request ISINK IRQ %d: %d\n",
206 irq, ret);
207 goto err_regulator;
208 }
209
210 platform_set_drvdata(pdev, isink);
211
212 return 0;
213
214err_regulator:
215 regulator_unregister(isink->regulator);
216err:
217 kfree(isink);
218 return ret;
219}
220
221static __devexit int wm831x_isink_remove(struct platform_device *pdev)
222{
223 struct wm831x_isink *isink = platform_get_drvdata(pdev);
224 struct wm831x *wm831x = isink->wm831x;
225
226 platform_set_drvdata(pdev, NULL);
227
228 wm831x_free_irq(wm831x, platform_get_irq(pdev, 0), isink);
229
230 regulator_unregister(isink->regulator);
231 kfree(isink);
232
233 return 0;
234}
235
236static struct platform_driver wm831x_isink_driver = {
237 .probe = wm831x_isink_probe,
238 .remove = __devexit_p(wm831x_isink_remove),
239 .driver = {
240 .name = "wm831x-isink",
241 .owner = THIS_MODULE,
242 },
243};
244
245static int __init wm831x_isink_init(void)
246{
247 int ret;
248 ret = platform_driver_register(&wm831x_isink_driver);
249 if (ret != 0)
250 pr_err("Failed to register WM831x ISINK driver: %d\n", ret);
251
252 return ret;
253}
254subsys_initcall(wm831x_isink_init);
255
256static void __exit wm831x_isink_exit(void)
257{
258 platform_driver_unregister(&wm831x_isink_driver);
259}
260module_exit(wm831x_isink_exit);
261
262
263MODULE_AUTHOR("Mark Brown");
264MODULE_DESCRIPTION("WM831x current sink driver");
265MODULE_LICENSE("GPL");
266MODULE_ALIAS("platform:wm831x-isink");
267
