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69dc16c3 MB |
1 | /* |
2 | * wm8994-regulator.c -- Regulator driver for the WM8994 | |
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/platform_device.h> | |
20 | #include <linux/regulator/driver.h> | |
21 | #include <linux/gpio.h> | |
5a0e3ad6 | 22 | #include <linux/slab.h> |
69dc16c3 MB |
23 | |
24 | #include <linux/mfd/wm8994/core.h> | |
25 | #include <linux/mfd/wm8994/registers.h> | |
26 | #include <linux/mfd/wm8994/pdata.h> | |
27 | ||
28 | struct wm8994_ldo { | |
29 | int enable; | |
598b3578 | 30 | bool is_enabled; |
69dc16c3 MB |
31 | struct regulator_dev *regulator; |
32 | struct wm8994 *wm8994; | |
33 | }; | |
34 | ||
35 | #define WM8994_LDO1_MAX_SELECTOR 0x7 | |
36 | #define WM8994_LDO2_MAX_SELECTOR 0x3 | |
37 | ||
38 | static int wm8994_ldo_enable(struct regulator_dev *rdev) | |
39 | { | |
40 | struct wm8994_ldo *ldo = rdev_get_drvdata(rdev); | |
41 | ||
42 | /* If we have no soft control assume that the LDO is always enabled. */ | |
43 | if (!ldo->enable) | |
44 | return 0; | |
45 | ||
46 | gpio_set_value(ldo->enable, 1); | |
598b3578 | 47 | ldo->is_enabled = true; |
69dc16c3 MB |
48 | |
49 | return 0; | |
50 | } | |
51 | ||
52 | static int wm8994_ldo_disable(struct regulator_dev *rdev) | |
53 | { | |
54 | struct wm8994_ldo *ldo = rdev_get_drvdata(rdev); | |
55 | ||
56 | /* If we have no soft control assume that the LDO is always enabled. */ | |
57 | if (!ldo->enable) | |
58 | return -EINVAL; | |
59 | ||
60 | gpio_set_value(ldo->enable, 0); | |
598b3578 | 61 | ldo->is_enabled = false; |
69dc16c3 MB |
62 | |
63 | return 0; | |
64 | } | |
65 | ||
66 | static int wm8994_ldo_is_enabled(struct regulator_dev *rdev) | |
67 | { | |
68 | struct wm8994_ldo *ldo = rdev_get_drvdata(rdev); | |
69 | ||
70 | return ldo->is_enabled; | |
71 | } | |
72 | ||
73 | static int wm8994_ldo_enable_time(struct regulator_dev *rdev) | |
74 | { | |
75 | /* 3ms is fairly conservative but this shouldn't be too performance | |
76 | * critical; can be tweaked per-system if required. */ | |
77 | return 3000; | |
78 | } | |
79 | ||
80 | static int wm8994_ldo1_list_voltage(struct regulator_dev *rdev, | |
81 | unsigned int selector) | |
82 | { | |
83 | if (selector > WM8994_LDO1_MAX_SELECTOR) | |
84 | return -EINVAL; | |
85 | ||
86 | return (selector * 100000) + 2400000; | |
87 | } | |
88 | ||
89 | static int wm8994_ldo1_get_voltage(struct regulator_dev *rdev) | |
90 | { | |
91 | struct wm8994_ldo *ldo = rdev_get_drvdata(rdev); | |
92 | int val; | |
93 | ||
94 | val = wm8994_reg_read(ldo->wm8994, WM8994_LDO_1); | |
95 | if (val < 0) | |
96 | return val; | |
97 | ||
98 | val = (val & WM8994_LDO1_VSEL_MASK) >> WM8994_LDO1_VSEL_SHIFT; | |
99 | ||
100 | return wm8994_ldo1_list_voltage(rdev, val); | |
101 | } | |
102 | ||
103 | static int wm8994_ldo1_set_voltage(struct regulator_dev *rdev, | |
104 | int min_uV, int max_uV) | |
105 | { | |
106 | struct wm8994_ldo *ldo = rdev_get_drvdata(rdev); | |
107 | int selector, v; | |
108 | ||
109 | selector = (min_uV - 2400000) / 100000; | |
110 | v = wm8994_ldo1_list_voltage(rdev, selector); | |
111 | if (v < 0 || v > max_uV) | |
112 | return -EINVAL; | |
113 | ||
114 | selector <<= WM8994_LDO1_VSEL_SHIFT; | |
115 | ||
116 | return wm8994_set_bits(ldo->wm8994, WM8994_LDO_1, | |
117 | WM8994_LDO1_VSEL_MASK, selector); | |
118 | } | |
119 | ||
120 | static struct regulator_ops wm8994_ldo1_ops = { | |
121 | .enable = wm8994_ldo_enable, | |
122 | .disable = wm8994_ldo_disable, | |
123 | .is_enabled = wm8994_ldo_is_enabled, | |
124 | .enable_time = wm8994_ldo_enable_time, | |
125 | ||
126 | .list_voltage = wm8994_ldo1_list_voltage, | |
127 | .get_voltage = wm8994_ldo1_get_voltage, | |
128 | .set_voltage = wm8994_ldo1_set_voltage, | |
129 | }; | |
130 | ||
131 | static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev, | |
132 | unsigned int selector) | |
133 | { | |
134 | if (selector > WM8994_LDO2_MAX_SELECTOR) | |
135 | return -EINVAL; | |
136 | ||
137 | return (selector * 100000) + 900000; | |
138 | } | |
139 | ||
140 | static int wm8994_ldo2_get_voltage(struct regulator_dev *rdev) | |
141 | { | |
142 | struct wm8994_ldo *ldo = rdev_get_drvdata(rdev); | |
143 | int val; | |
144 | ||
145 | val = wm8994_reg_read(ldo->wm8994, WM8994_LDO_2); | |
146 | if (val < 0) | |
147 | return val; | |
148 | ||
149 | val = (val & WM8994_LDO2_VSEL_MASK) >> WM8994_LDO2_VSEL_SHIFT; | |
150 | ||
151 | return wm8994_ldo2_list_voltage(rdev, val); | |
152 | } | |
153 | ||
154 | static int wm8994_ldo2_set_voltage(struct regulator_dev *rdev, | |
155 | int min_uV, int max_uV) | |
156 | { | |
157 | struct wm8994_ldo *ldo = rdev_get_drvdata(rdev); | |
158 | int selector, v; | |
159 | ||
160 | selector = (min_uV - 900000) / 100000; | |
161 | v = wm8994_ldo2_list_voltage(rdev, selector); | |
162 | if (v < 0 || v > max_uV) | |
163 | return -EINVAL; | |
164 | ||
165 | selector <<= WM8994_LDO2_VSEL_SHIFT; | |
166 | ||
167 | return wm8994_set_bits(ldo->wm8994, WM8994_LDO_2, | |
168 | WM8994_LDO2_VSEL_MASK, selector); | |
169 | } | |
170 | ||
171 | static struct regulator_ops wm8994_ldo2_ops = { | |
172 | .enable = wm8994_ldo_enable, | |
173 | .disable = wm8994_ldo_disable, | |
174 | .is_enabled = wm8994_ldo_is_enabled, | |
175 | .enable_time = wm8994_ldo_enable_time, | |
176 | ||
177 | .list_voltage = wm8994_ldo2_list_voltage, | |
178 | .get_voltage = wm8994_ldo2_get_voltage, | |
179 | .set_voltage = wm8994_ldo2_set_voltage, | |
180 | }; | |
181 | ||
182 | static struct regulator_desc wm8994_ldo_desc[] = { | |
183 | { | |
184 | .name = "LDO1", | |
185 | .id = 1, | |
186 | .type = REGULATOR_VOLTAGE, | |
187 | .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1, | |
188 | .ops = &wm8994_ldo1_ops, | |
189 | .owner = THIS_MODULE, | |
190 | }, | |
191 | { | |
192 | .name = "LDO2", | |
193 | .id = 2, | |
194 | .type = REGULATOR_VOLTAGE, | |
195 | .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1, | |
196 | .ops = &wm8994_ldo2_ops, | |
197 | .owner = THIS_MODULE, | |
198 | }, | |
199 | }; | |
200 | ||
201 | static __devinit int wm8994_ldo_probe(struct platform_device *pdev) | |
202 | { | |
203 | struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent); | |
204 | struct wm8994_pdata *pdata = wm8994->dev->platform_data; | |
205 | int id = pdev->id % ARRAY_SIZE(pdata->ldo); | |
206 | struct wm8994_ldo *ldo; | |
207 | int ret; | |
208 | ||
209 | dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1); | |
210 | ||
211 | if (!pdata) | |
212 | return -ENODEV; | |
213 | ||
214 | ldo = kzalloc(sizeof(struct wm8994_ldo), GFP_KERNEL); | |
215 | if (ldo == NULL) { | |
216 | dev_err(&pdev->dev, "Unable to allocate private data\n"); | |
217 | return -ENOMEM; | |
218 | } | |
219 | ||
220 | ldo->wm8994 = wm8994; | |
221 | ||
69dc16c3 MB |
222 | if (pdata->ldo[id].enable && gpio_is_valid(pdata->ldo[id].enable)) { |
223 | ldo->enable = pdata->ldo[id].enable; | |
224 | ||
225 | ret = gpio_request(ldo->enable, "WM8994 LDO enable"); | |
226 | if (ret < 0) { | |
227 | dev_err(&pdev->dev, "Failed to get enable GPIO: %d\n", | |
228 | ret); | |
229 | goto err; | |
230 | } | |
231 | ||
232 | ret = gpio_direction_output(ldo->enable, ldo->is_enabled); | |
233 | if (ret < 0) { | |
234 | dev_err(&pdev->dev, "Failed to set GPIO up: %d\n", | |
235 | ret); | |
236 | goto err_gpio; | |
237 | } | |
c4604e49 JS |
238 | } else |
239 | ldo->is_enabled = true; | |
69dc16c3 MB |
240 | |
241 | ldo->regulator = regulator_register(&wm8994_ldo_desc[id], &pdev->dev, | |
242 | pdata->ldo[id].init_data, ldo); | |
243 | if (IS_ERR(ldo->regulator)) { | |
244 | ret = PTR_ERR(ldo->regulator); | |
245 | dev_err(wm8994->dev, "Failed to register LDO%d: %d\n", | |
246 | id + 1, ret); | |
247 | goto err_gpio; | |
248 | } | |
249 | ||
250 | platform_set_drvdata(pdev, ldo); | |
251 | ||
252 | return 0; | |
253 | ||
254 | err_gpio: | |
255 | if (gpio_is_valid(ldo->enable)) | |
256 | gpio_free(ldo->enable); | |
257 | err: | |
258 | kfree(ldo); | |
259 | return ret; | |
260 | } | |
261 | ||
262 | static __devexit int wm8994_ldo_remove(struct platform_device *pdev) | |
263 | { | |
264 | struct wm8994_ldo *ldo = platform_get_drvdata(pdev); | |
265 | ||
598b3578 DT |
266 | platform_set_drvdata(pdev, NULL); |
267 | ||
69dc16c3 MB |
268 | regulator_unregister(ldo->regulator); |
269 | if (gpio_is_valid(ldo->enable)) | |
270 | gpio_free(ldo->enable); | |
271 | kfree(ldo); | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
276 | static struct platform_driver wm8994_ldo_driver = { | |
277 | .probe = wm8994_ldo_probe, | |
278 | .remove = __devexit_p(wm8994_ldo_remove), | |
279 | .driver = { | |
280 | .name = "wm8994-ldo", | |
598b3578 | 281 | .owner = THIS_MODULE, |
69dc16c3 MB |
282 | }, |
283 | }; | |
284 | ||
285 | static int __init wm8994_ldo_init(void) | |
286 | { | |
287 | int ret; | |
288 | ||
289 | ret = platform_driver_register(&wm8994_ldo_driver); | |
290 | if (ret != 0) | |
291 | pr_err("Failed to register Wm8994 GP LDO driver: %d\n", ret); | |
292 | ||
293 | return ret; | |
294 | } | |
295 | subsys_initcall(wm8994_ldo_init); | |
296 | ||
297 | static void __exit wm8994_ldo_exit(void) | |
298 | { | |
299 | platform_driver_unregister(&wm8994_ldo_driver); | |
300 | } | |
301 | module_exit(wm8994_ldo_exit); | |
302 | ||
303 | /* Module information */ | |
304 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
305 | MODULE_DESCRIPTION("WM8994 LDO driver"); | |
306 | MODULE_LICENSE("GPL"); | |
307 | MODULE_ALIAS("platform:wm8994-ldo"); |