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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 | ||
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 | ||
29 | struct 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 | ||
37 | static 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 | ||
59 | static 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 | ||
77 | static 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 | ||
94 | static 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 | ||
113 | static 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 | ||
130 | static 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 | ||
138 | static 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 | ||
150 | static __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 | ||
170 | res = platform_get_resource(pdev, IORESOURCE_IO, 0); | |
171 | if (res == NULL) { | |
172 | dev_err(&pdev->dev, "No I/O resource\n"); | |
173 | ret = -EINVAL; | |
174 | goto err; | |
175 | } | |
176 | isink->reg = res->start; | |
177 | ||
178 | /* For current parts this is correct; probably need to revisit | |
179 | * in future. | |
180 | */ | |
181 | snprintf(isink->name, sizeof(isink->name), "ISINK%d", id + 1); | |
182 | isink->desc.name = isink->name; | |
183 | isink->desc.id = id; | |
184 | isink->desc.ops = &wm831x_isink_ops; | |
185 | isink->desc.type = REGULATOR_CURRENT; | |
186 | isink->desc.owner = THIS_MODULE; | |
187 | ||
188 | isink->regulator = regulator_register(&isink->desc, &pdev->dev, | |
189 | pdata->isink[id], isink); | |
190 | if (IS_ERR(isink->regulator)) { | |
191 | ret = PTR_ERR(isink->regulator); | |
192 | dev_err(wm831x->dev, "Failed to register ISINK%d: %d\n", | |
193 | id + 1, ret); | |
194 | goto err; | |
195 | } | |
196 | ||
197 | irq = platform_get_irq(pdev, 0); | |
198 | ret = wm831x_request_irq(wm831x, irq, wm831x_isink_irq, | |
199 | IRQF_TRIGGER_RISING, isink->name, | |
200 | isink); | |
201 | if (ret != 0) { | |
202 | dev_err(&pdev->dev, "Failed to request ISINK IRQ %d: %d\n", | |
203 | irq, ret); | |
204 | goto err_regulator; | |
205 | } | |
206 | ||
207 | platform_set_drvdata(pdev, isink); | |
208 | ||
209 | return 0; | |
210 | ||
211 | err_regulator: | |
212 | regulator_unregister(isink->regulator); | |
213 | err: | |
214 | kfree(isink); | |
215 | return ret; | |
216 | } | |
217 | ||
218 | static __devexit int wm831x_isink_remove(struct platform_device *pdev) | |
219 | { | |
220 | struct wm831x_isink *isink = platform_get_drvdata(pdev); | |
221 | struct wm831x *wm831x = isink->wm831x; | |
222 | ||
223 | wm831x_free_irq(wm831x, platform_get_irq(pdev, 0), isink); | |
224 | ||
225 | regulator_unregister(isink->regulator); | |
226 | kfree(isink); | |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
231 | static struct platform_driver wm831x_isink_driver = { | |
232 | .probe = wm831x_isink_probe, | |
233 | .remove = __devexit_p(wm831x_isink_remove), | |
234 | .driver = { | |
235 | .name = "wm831x-isink", | |
236 | }, | |
237 | }; | |
238 | ||
239 | static int __init wm831x_isink_init(void) | |
240 | { | |
241 | int ret; | |
242 | ret = platform_driver_register(&wm831x_isink_driver); | |
243 | if (ret != 0) | |
244 | pr_err("Failed to register WM831x ISINK driver: %d\n", ret); | |
245 | ||
246 | return ret; | |
247 | } | |
248 | subsys_initcall(wm831x_isink_init); | |
249 | ||
250 | static void __exit wm831x_isink_exit(void) | |
251 | { | |
252 | platform_driver_unregister(&wm831x_isink_driver); | |
253 | } | |
254 | module_exit(wm831x_isink_exit); | |
255 | ||
256 | /* Module information */ | |
257 | MODULE_AUTHOR("Mark Brown"); | |
258 | MODULE_DESCRIPTION("WM831x current sink driver"); | |
259 | MODULE_LICENSE("GPL"); | |
260 | MODULE_ALIAS("platform:wm831x-isink"); |