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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 | #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 int wm831x_isink_probe(struct platform_device *pdev) | |
152 | { | |
153 | struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); | |
154 | struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev); | |
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_REG, 0); | |
176 | if (res == NULL) { | |
177 | dev_err(&pdev->dev, "No REG 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 | ||
218 | err_regulator: | |
219 | regulator_unregister(isink->regulator); | |
220 | err: | |
221 | return ret; | |
222 | } | |
223 | ||
224 | static int wm831x_isink_remove(struct platform_device *pdev) | |
225 | { | |
226 | struct wm831x_isink *isink = platform_get_drvdata(pdev); | |
227 | ||
228 | free_irq(wm831x_irq(isink->wm831x, platform_get_irq(pdev, 0)), isink); | |
229 | ||
230 | regulator_unregister(isink->regulator); | |
231 | ||
232 | return 0; | |
233 | } | |
234 | ||
235 | static struct platform_driver wm831x_isink_driver = { | |
236 | .probe = wm831x_isink_probe, | |
237 | .remove = wm831x_isink_remove, | |
238 | .driver = { | |
239 | .name = "wm831x-isink", | |
240 | .owner = THIS_MODULE, | |
241 | }, | |
242 | }; | |
243 | ||
244 | static int __init wm831x_isink_init(void) | |
245 | { | |
246 | int ret; | |
247 | ret = platform_driver_register(&wm831x_isink_driver); | |
248 | if (ret != 0) | |
249 | pr_err("Failed to register WM831x ISINK driver: %d\n", ret); | |
250 | ||
251 | return ret; | |
252 | } | |
253 | subsys_initcall(wm831x_isink_init); | |
254 | ||
255 | static void __exit wm831x_isink_exit(void) | |
256 | { | |
257 | platform_driver_unregister(&wm831x_isink_driver); | |
258 | } | |
259 | module_exit(wm831x_isink_exit); | |
260 | ||
261 | /* Module information */ | |
262 | MODULE_AUTHOR("Mark Brown"); | |
263 | MODULE_DESCRIPTION("WM831x current sink driver"); | |
264 | MODULE_LICENSE("GPL"); | |
265 | MODULE_ALIAS("platform:wm831x-isink"); |