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1 | /* |
2 | * Regulator support for WM8400 | |
3 | * | |
4 | * Copyright 2008 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 | |
9 | * modify it under the terms of the GNU General Public License as | |
10 | * published by the Free Software Foundation; either version 2 of the | |
11 | * License, or (at your option) any later version. | |
12 | * | |
13 | */ | |
14 | ||
15 | #include <linux/bug.h> | |
16 | #include <linux/err.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/regulator/driver.h> | |
19 | #include <linux/mfd/wm8400-private.h> | |
20 | ||
21 | static int wm8400_ldo_is_enabled(struct regulator_dev *dev) | |
22 | { | |
23 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
24 | u16 val; | |
25 | ||
26 | val = wm8400_reg_read(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev)); | |
27 | return (val & WM8400_LDO1_ENA) != 0; | |
28 | } | |
29 | ||
30 | static int wm8400_ldo_enable(struct regulator_dev *dev) | |
31 | { | |
32 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
33 | ||
34 | return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev), | |
35 | WM8400_LDO1_ENA, WM8400_LDO1_ENA); | |
36 | } | |
37 | ||
38 | static int wm8400_ldo_disable(struct regulator_dev *dev) | |
39 | { | |
40 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
41 | ||
42 | return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev), | |
43 | WM8400_LDO1_ENA, 0); | |
44 | } | |
45 | ||
46 | static int wm8400_ldo_get_voltage(struct regulator_dev *dev) | |
47 | { | |
48 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
49 | u16 val; | |
50 | ||
51 | val = wm8400_reg_read(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev)); | |
52 | val &= WM8400_LDO1_VSEL_MASK; | |
53 | ||
54 | if (val < 15) | |
55 | return 900000 + (val * 50000); | |
56 | else | |
57 | return 1600000 + ((val - 14) * 100000); | |
58 | } | |
59 | ||
60 | static int wm8400_ldo_set_voltage(struct regulator_dev *dev, | |
61 | int min_uV, int max_uV) | |
62 | { | |
63 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
64 | u16 val; | |
65 | ||
66 | if (min_uV < 900000 || min_uV > 3300000) | |
67 | return -EINVAL; | |
68 | ||
69 | if (min_uV < 1700000) { | |
70 | /* Steps of 50mV from 900mV; */ | |
71 | val = (min_uV - 850001) / 50000; | |
72 | ||
73 | if ((val * 50000) + 900000 > max_uV) | |
74 | return -EINVAL; | |
75 | BUG_ON((val * 50000) + 900000 < min_uV); | |
76 | } else { | |
77 | /* Steps of 100mV from 1700mV */ | |
78 | val = ((min_uV - 1600001) / 100000); | |
79 | ||
80 | if ((val * 100000) + 1700000 > max_uV) | |
81 | return -EINVAL; | |
82 | BUG_ON((val * 100000) + 1700000 < min_uV); | |
83 | ||
84 | val += 0xf; | |
85 | } | |
86 | ||
87 | return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev), | |
88 | WM8400_LDO1_VSEL_MASK, val); | |
89 | } | |
90 | ||
91 | static struct regulator_ops wm8400_ldo_ops = { | |
92 | .is_enabled = wm8400_ldo_is_enabled, | |
93 | .enable = wm8400_ldo_enable, | |
94 | .disable = wm8400_ldo_disable, | |
95 | .get_voltage = wm8400_ldo_get_voltage, | |
96 | .set_voltage = wm8400_ldo_set_voltage, | |
97 | }; | |
98 | ||
99 | static int wm8400_dcdc_is_enabled(struct regulator_dev *dev) | |
100 | { | |
101 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
102 | int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; | |
103 | u16 val; | |
104 | ||
105 | val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset); | |
106 | return (val & WM8400_DC1_ENA) != 0; | |
107 | } | |
108 | ||
109 | static int wm8400_dcdc_enable(struct regulator_dev *dev) | |
110 | { | |
111 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
112 | int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; | |
113 | ||
114 | return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, | |
115 | WM8400_DC1_ENA, WM8400_DC1_ENA); | |
116 | } | |
117 | ||
118 | static int wm8400_dcdc_disable(struct regulator_dev *dev) | |
119 | { | |
120 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
121 | int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; | |
122 | ||
123 | return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, | |
124 | WM8400_DC1_ENA, 0); | |
125 | } | |
126 | ||
127 | static int wm8400_dcdc_get_voltage(struct regulator_dev *dev) | |
128 | { | |
129 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
130 | u16 val; | |
131 | int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; | |
132 | ||
133 | val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset); | |
134 | val &= WM8400_DC1_VSEL_MASK; | |
135 | ||
136 | return 850000 + (25000 * val); | |
137 | } | |
138 | ||
139 | static int wm8400_dcdc_set_voltage(struct regulator_dev *dev, | |
140 | int min_uV, int max_uV) | |
141 | { | |
142 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
143 | u16 val; | |
144 | int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; | |
145 | ||
146 | if (min_uV < 850000) | |
147 | return -EINVAL; | |
148 | ||
149 | val = (min_uV - 825001) / 25000; | |
150 | ||
151 | if (850000 + (25000 * val) > max_uV) | |
152 | return -EINVAL; | |
153 | BUG_ON(850000 + (25000 * val) < min_uV); | |
154 | ||
155 | return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, | |
156 | WM8400_DC1_VSEL_MASK, val); | |
157 | } | |
158 | ||
159 | static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev) | |
160 | { | |
161 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
162 | int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; | |
163 | u16 data[2]; | |
164 | int ret; | |
165 | ||
166 | ret = wm8400_block_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 2, | |
167 | data); | |
168 | if (ret != 0) | |
169 | return 0; | |
170 | ||
171 | /* Datasheet: hibernate */ | |
172 | if (data[0] & WM8400_DC1_SLEEP) | |
173 | return REGULATOR_MODE_STANDBY; | |
174 | ||
175 | /* Datasheet: standby */ | |
176 | if (!(data[0] & WM8400_DC1_ACTIVE)) | |
177 | return REGULATOR_MODE_IDLE; | |
178 | ||
179 | /* Datasheet: active with or without force PWM */ | |
180 | if (data[1] & WM8400_DC1_FRC_PWM) | |
181 | return REGULATOR_MODE_FAST; | |
182 | else | |
183 | return REGULATOR_MODE_NORMAL; | |
184 | } | |
185 | ||
186 | static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode) | |
187 | { | |
188 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
189 | int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; | |
190 | int ret; | |
191 | ||
192 | switch (mode) { | |
193 | case REGULATOR_MODE_FAST: | |
194 | /* Datasheet: active with force PWM */ | |
195 | ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset, | |
196 | WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM); | |
197 | if (ret != 0) | |
198 | return ret; | |
199 | ||
200 | return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, | |
201 | WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, | |
202 | WM8400_DC1_ACTIVE); | |
203 | ||
204 | case REGULATOR_MODE_NORMAL: | |
205 | /* Datasheet: active */ | |
206 | ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset, | |
207 | WM8400_DC1_FRC_PWM, 0); | |
208 | if (ret != 0) | |
209 | return ret; | |
210 | ||
211 | return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, | |
212 | WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, | |
213 | WM8400_DC1_ACTIVE); | |
214 | ||
215 | case REGULATOR_MODE_IDLE: | |
216 | /* Datasheet: standby */ | |
217 | ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, | |
218 | WM8400_DC1_ACTIVE, 0); | |
219 | if (ret != 0) | |
220 | return ret; | |
221 | return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, | |
222 | WM8400_DC1_SLEEP, 0); | |
223 | ||
224 | default: | |
225 | return -EINVAL; | |
226 | } | |
227 | } | |
228 | ||
229 | static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev, | |
230 | int input_uV, int output_uV, | |
231 | int load_uA) | |
232 | { | |
233 | return REGULATOR_MODE_NORMAL; | |
234 | } | |
235 | ||
236 | static struct regulator_ops wm8400_dcdc_ops = { | |
237 | .is_enabled = wm8400_dcdc_is_enabled, | |
238 | .enable = wm8400_dcdc_enable, | |
239 | .disable = wm8400_dcdc_disable, | |
240 | .get_voltage = wm8400_dcdc_get_voltage, | |
241 | .set_voltage = wm8400_dcdc_set_voltage, | |
242 | .get_mode = wm8400_dcdc_get_mode, | |
243 | .set_mode = wm8400_dcdc_set_mode, | |
244 | .get_optimum_mode = wm8400_dcdc_get_optimum_mode, | |
245 | }; | |
246 | ||
247 | static struct regulator_desc regulators[] = { | |
248 | { | |
249 | .name = "LDO1", | |
250 | .id = WM8400_LDO1, | |
251 | .ops = &wm8400_ldo_ops, | |
252 | .type = REGULATOR_VOLTAGE, | |
253 | .owner = THIS_MODULE, | |
254 | }, | |
255 | { | |
256 | .name = "LDO2", | |
257 | .id = WM8400_LDO2, | |
258 | .ops = &wm8400_ldo_ops, | |
259 | .type = REGULATOR_VOLTAGE, | |
260 | .owner = THIS_MODULE, | |
261 | }, | |
262 | { | |
263 | .name = "LDO3", | |
264 | .id = WM8400_LDO3, | |
265 | .ops = &wm8400_ldo_ops, | |
266 | .type = REGULATOR_VOLTAGE, | |
267 | .owner = THIS_MODULE, | |
268 | }, | |
269 | { | |
270 | .name = "LDO4", | |
271 | .id = WM8400_LDO4, | |
272 | .ops = &wm8400_ldo_ops, | |
273 | .type = REGULATOR_VOLTAGE, | |
274 | .owner = THIS_MODULE, | |
275 | }, | |
276 | { | |
277 | .name = "DCDC1", | |
278 | .id = WM8400_DCDC1, | |
279 | .ops = &wm8400_dcdc_ops, | |
280 | .type = REGULATOR_VOLTAGE, | |
281 | .owner = THIS_MODULE, | |
282 | }, | |
283 | { | |
284 | .name = "DCDC2", | |
285 | .id = WM8400_DCDC2, | |
286 | .ops = &wm8400_dcdc_ops, | |
287 | .type = REGULATOR_VOLTAGE, | |
288 | .owner = THIS_MODULE, | |
289 | }, | |
290 | }; | |
291 | ||
292 | static int __init wm8400_regulator_probe(struct platform_device *pdev) | |
293 | { | |
294 | struct regulator_dev *rdev; | |
295 | ||
296 | rdev = regulator_register(®ulators[pdev->id], &pdev->dev, | |
297 | pdev->dev.driver_data); | |
298 | ||
299 | if (IS_ERR(rdev)) | |
300 | return PTR_ERR(rdev); | |
301 | ||
302 | return 0; | |
303 | } | |
304 | ||
305 | static int __devexit wm8400_regulator_remove(struct platform_device *pdev) | |
306 | { | |
307 | struct regulator_dev *rdev = platform_get_drvdata(pdev); | |
308 | ||
309 | regulator_unregister(rdev); | |
310 | ||
311 | return 0; | |
312 | } | |
313 | ||
314 | static struct platform_driver wm8400_regulator_driver = { | |
315 | .driver = { | |
316 | .name = "wm8400-regulator", | |
317 | }, | |
318 | .probe = wm8400_regulator_probe, | |
319 | .remove = __devexit_p(wm8400_regulator_remove), | |
320 | }; | |
321 | ||
322 | /** | |
323 | * wm8400_register_regulator - enable software control of a WM8400 regulator | |
324 | * | |
325 | * This function enables software control of a WM8400 regulator via | |
326 | * the regulator API. It is intended to be called from the | |
327 | * platform_init() callback of the WM8400 MFD driver. | |
328 | * | |
329 | * @param dev The WM8400 device to operate on. | |
330 | * @param reg The regulator to control. | |
331 | * @param initdata Regulator initdata for the regulator. | |
332 | */ | |
333 | int wm8400_register_regulator(struct device *dev, int reg, | |
334 | struct regulator_init_data *initdata) | |
335 | { | |
336 | struct wm8400 *wm8400 = dev->driver_data; | |
337 | ||
338 | if (wm8400->regulators[reg].name) | |
339 | return -EBUSY; | |
340 | ||
341 | initdata->driver_data = wm8400; | |
342 | ||
343 | wm8400->regulators[reg].name = "wm8400-regulator"; | |
344 | wm8400->regulators[reg].id = reg; | |
345 | wm8400->regulators[reg].dev.parent = dev; | |
346 | wm8400->regulators[reg].dev.driver_data = wm8400; | |
347 | wm8400->regulators[reg].dev.platform_data = initdata; | |
348 | ||
349 | return platform_device_register(&wm8400->regulators[reg]); | |
350 | } | |
351 | EXPORT_SYMBOL_GPL(wm8400_register_regulator); | |
352 | ||
353 | static int __init wm8400_regulator_init(void) | |
354 | { | |
355 | return platform_driver_register(&wm8400_regulator_driver); | |
356 | } | |
357 | module_init(wm8400_regulator_init); | |
358 | ||
359 | static void __exit wm8400_regulator_exit(void) | |
360 | { | |
361 | platform_driver_unregister(&wm8400_regulator_driver); | |
362 | } | |
363 | module_exit(wm8400_regulator_exit); | |
364 | ||
365 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
366 | MODULE_DESCRIPTION("WM8400 regulator driver"); | |
367 | MODULE_LICENSE("GPL"); | |
368 | MODULE_ALIAS("platform:wm8400-regulator"); |