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42fad570 MB |
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 | ||
216765d9 MB |
46 | static int wm8400_ldo_list_voltage(struct regulator_dev *dev, |
47 | unsigned selector) | |
48 | { | |
49 | if (selector > WM8400_LDO1_VSEL_MASK) | |
50 | return -EINVAL; | |
51 | ||
52 | if (selector < 15) | |
53 | return 900000 + (selector * 50000); | |
54 | else | |
55 | return 1600000 + ((selector - 14) * 100000); | |
56 | } | |
57 | ||
42fad570 MB |
58 | static int wm8400_ldo_get_voltage(struct regulator_dev *dev) |
59 | { | |
60 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
61 | u16 val; | |
62 | ||
63 | val = wm8400_reg_read(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev)); | |
64 | val &= WM8400_LDO1_VSEL_MASK; | |
65 | ||
216765d9 | 66 | return wm8400_ldo_list_voltage(dev, val); |
42fad570 MB |
67 | } |
68 | ||
69 | static int wm8400_ldo_set_voltage(struct regulator_dev *dev, | |
70 | int min_uV, int max_uV) | |
71 | { | |
72 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
73 | u16 val; | |
74 | ||
75 | if (min_uV < 900000 || min_uV > 3300000) | |
76 | return -EINVAL; | |
77 | ||
78 | if (min_uV < 1700000) { | |
79 | /* Steps of 50mV from 900mV; */ | |
80 | val = (min_uV - 850001) / 50000; | |
81 | ||
82 | if ((val * 50000) + 900000 > max_uV) | |
83 | return -EINVAL; | |
84 | BUG_ON((val * 50000) + 900000 < min_uV); | |
85 | } else { | |
86 | /* Steps of 100mV from 1700mV */ | |
87 | val = ((min_uV - 1600001) / 100000); | |
88 | ||
89 | if ((val * 100000) + 1700000 > max_uV) | |
90 | return -EINVAL; | |
91 | BUG_ON((val * 100000) + 1700000 < min_uV); | |
92 | ||
93 | val += 0xf; | |
94 | } | |
95 | ||
96 | return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev), | |
97 | WM8400_LDO1_VSEL_MASK, val); | |
98 | } | |
99 | ||
100 | static struct regulator_ops wm8400_ldo_ops = { | |
101 | .is_enabled = wm8400_ldo_is_enabled, | |
102 | .enable = wm8400_ldo_enable, | |
103 | .disable = wm8400_ldo_disable, | |
216765d9 | 104 | .list_voltage = wm8400_ldo_list_voltage, |
42fad570 MB |
105 | .get_voltage = wm8400_ldo_get_voltage, |
106 | .set_voltage = wm8400_ldo_set_voltage, | |
107 | }; | |
108 | ||
109 | static int wm8400_dcdc_is_enabled(struct regulator_dev *dev) | |
110 | { | |
111 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
112 | int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; | |
113 | u16 val; | |
114 | ||
115 | val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset); | |
116 | return (val & WM8400_DC1_ENA) != 0; | |
117 | } | |
118 | ||
119 | static int wm8400_dcdc_enable(struct regulator_dev *dev) | |
120 | { | |
121 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
122 | int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; | |
123 | ||
124 | return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, | |
125 | WM8400_DC1_ENA, WM8400_DC1_ENA); | |
126 | } | |
127 | ||
128 | static int wm8400_dcdc_disable(struct regulator_dev *dev) | |
129 | { | |
130 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
131 | int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; | |
132 | ||
133 | return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, | |
134 | WM8400_DC1_ENA, 0); | |
135 | } | |
136 | ||
216765d9 MB |
137 | static int wm8400_dcdc_list_voltage(struct regulator_dev *dev, |
138 | unsigned selector) | |
139 | { | |
140 | if (selector > WM8400_DC1_VSEL_MASK) | |
141 | return -EINVAL; | |
142 | ||
143 | return 850000 + (selector * 25000); | |
144 | } | |
145 | ||
42fad570 MB |
146 | static int wm8400_dcdc_get_voltage(struct regulator_dev *dev) |
147 | { | |
148 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
149 | u16 val; | |
150 | int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; | |
151 | ||
152 | val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset); | |
153 | val &= WM8400_DC1_VSEL_MASK; | |
154 | ||
155 | return 850000 + (25000 * val); | |
156 | } | |
157 | ||
158 | static int wm8400_dcdc_set_voltage(struct regulator_dev *dev, | |
159 | int min_uV, int max_uV) | |
160 | { | |
161 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
162 | u16 val; | |
163 | int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; | |
164 | ||
165 | if (min_uV < 850000) | |
166 | return -EINVAL; | |
167 | ||
168 | val = (min_uV - 825001) / 25000; | |
169 | ||
170 | if (850000 + (25000 * val) > max_uV) | |
171 | return -EINVAL; | |
172 | BUG_ON(850000 + (25000 * val) < min_uV); | |
173 | ||
174 | return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, | |
175 | WM8400_DC1_VSEL_MASK, val); | |
176 | } | |
177 | ||
178 | static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev) | |
179 | { | |
180 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
181 | int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; | |
182 | u16 data[2]; | |
183 | int ret; | |
184 | ||
185 | ret = wm8400_block_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 2, | |
186 | data); | |
187 | if (ret != 0) | |
188 | return 0; | |
189 | ||
190 | /* Datasheet: hibernate */ | |
191 | if (data[0] & WM8400_DC1_SLEEP) | |
192 | return REGULATOR_MODE_STANDBY; | |
193 | ||
194 | /* Datasheet: standby */ | |
195 | if (!(data[0] & WM8400_DC1_ACTIVE)) | |
196 | return REGULATOR_MODE_IDLE; | |
197 | ||
198 | /* Datasheet: active with or without force PWM */ | |
199 | if (data[1] & WM8400_DC1_FRC_PWM) | |
200 | return REGULATOR_MODE_FAST; | |
201 | else | |
202 | return REGULATOR_MODE_NORMAL; | |
203 | } | |
204 | ||
205 | static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode) | |
206 | { | |
207 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
208 | int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; | |
209 | int ret; | |
210 | ||
211 | switch (mode) { | |
212 | case REGULATOR_MODE_FAST: | |
213 | /* Datasheet: active with force PWM */ | |
214 | ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset, | |
215 | WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM); | |
216 | if (ret != 0) | |
217 | return ret; | |
218 | ||
219 | return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, | |
220 | WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, | |
221 | WM8400_DC1_ACTIVE); | |
222 | ||
223 | case REGULATOR_MODE_NORMAL: | |
224 | /* Datasheet: active */ | |
225 | ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset, | |
226 | WM8400_DC1_FRC_PWM, 0); | |
227 | if (ret != 0) | |
228 | return ret; | |
229 | ||
230 | return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, | |
231 | WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, | |
232 | WM8400_DC1_ACTIVE); | |
233 | ||
234 | case REGULATOR_MODE_IDLE: | |
235 | /* Datasheet: standby */ | |
236 | ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, | |
237 | WM8400_DC1_ACTIVE, 0); | |
238 | if (ret != 0) | |
239 | return ret; | |
240 | return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, | |
241 | WM8400_DC1_SLEEP, 0); | |
242 | ||
243 | default: | |
244 | return -EINVAL; | |
245 | } | |
246 | } | |
247 | ||
248 | static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev, | |
249 | int input_uV, int output_uV, | |
250 | int load_uA) | |
251 | { | |
252 | return REGULATOR_MODE_NORMAL; | |
253 | } | |
254 | ||
255 | static struct regulator_ops wm8400_dcdc_ops = { | |
256 | .is_enabled = wm8400_dcdc_is_enabled, | |
257 | .enable = wm8400_dcdc_enable, | |
258 | .disable = wm8400_dcdc_disable, | |
216765d9 | 259 | .list_voltage = wm8400_dcdc_list_voltage, |
42fad570 MB |
260 | .get_voltage = wm8400_dcdc_get_voltage, |
261 | .set_voltage = wm8400_dcdc_set_voltage, | |
262 | .get_mode = wm8400_dcdc_get_mode, | |
263 | .set_mode = wm8400_dcdc_set_mode, | |
264 | .get_optimum_mode = wm8400_dcdc_get_optimum_mode, | |
265 | }; | |
266 | ||
267 | static struct regulator_desc regulators[] = { | |
268 | { | |
269 | .name = "LDO1", | |
270 | .id = WM8400_LDO1, | |
271 | .ops = &wm8400_ldo_ops, | |
216765d9 | 272 | .n_voltages = WM8400_LDO1_VSEL_MASK + 1, |
42fad570 MB |
273 | .type = REGULATOR_VOLTAGE, |
274 | .owner = THIS_MODULE, | |
275 | }, | |
276 | { | |
277 | .name = "LDO2", | |
278 | .id = WM8400_LDO2, | |
279 | .ops = &wm8400_ldo_ops, | |
216765d9 | 280 | .n_voltages = WM8400_LDO2_VSEL_MASK + 1, |
42fad570 MB |
281 | .type = REGULATOR_VOLTAGE, |
282 | .owner = THIS_MODULE, | |
283 | }, | |
284 | { | |
285 | .name = "LDO3", | |
286 | .id = WM8400_LDO3, | |
287 | .ops = &wm8400_ldo_ops, | |
216765d9 | 288 | .n_voltages = WM8400_LDO3_VSEL_MASK + 1, |
42fad570 MB |
289 | .type = REGULATOR_VOLTAGE, |
290 | .owner = THIS_MODULE, | |
291 | }, | |
292 | { | |
293 | .name = "LDO4", | |
294 | .id = WM8400_LDO4, | |
295 | .ops = &wm8400_ldo_ops, | |
216765d9 | 296 | .n_voltages = WM8400_LDO4_VSEL_MASK + 1, |
42fad570 MB |
297 | .type = REGULATOR_VOLTAGE, |
298 | .owner = THIS_MODULE, | |
299 | }, | |
300 | { | |
301 | .name = "DCDC1", | |
302 | .id = WM8400_DCDC1, | |
303 | .ops = &wm8400_dcdc_ops, | |
216765d9 | 304 | .n_voltages = WM8400_DC1_VSEL_MASK + 1, |
42fad570 MB |
305 | .type = REGULATOR_VOLTAGE, |
306 | .owner = THIS_MODULE, | |
307 | }, | |
308 | { | |
309 | .name = "DCDC2", | |
310 | .id = WM8400_DCDC2, | |
311 | .ops = &wm8400_dcdc_ops, | |
216765d9 | 312 | .n_voltages = WM8400_DC2_VSEL_MASK + 1, |
42fad570 MB |
313 | .type = REGULATOR_VOLTAGE, |
314 | .owner = THIS_MODULE, | |
315 | }, | |
316 | }; | |
317 | ||
5dbdf735 | 318 | static int __devinit wm8400_regulator_probe(struct platform_device *pdev) |
42fad570 | 319 | { |
1ad02bbc | 320 | struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]); |
42fad570 MB |
321 | struct regulator_dev *rdev; |
322 | ||
323 | rdev = regulator_register(®ulators[pdev->id], &pdev->dev, | |
1ad02bbc | 324 | pdev->dev.platform_data, wm8400); |
42fad570 MB |
325 | |
326 | if (IS_ERR(rdev)) | |
327 | return PTR_ERR(rdev); | |
328 | ||
1ad02bbc DT |
329 | platform_set_drvdata(pdev, rdev); |
330 | ||
42fad570 MB |
331 | return 0; |
332 | } | |
333 | ||
334 | static int __devexit wm8400_regulator_remove(struct platform_device *pdev) | |
335 | { | |
336 | struct regulator_dev *rdev = platform_get_drvdata(pdev); | |
337 | ||
1ad02bbc | 338 | platform_set_drvdata(pdev, NULL); |
42fad570 MB |
339 | regulator_unregister(rdev); |
340 | ||
341 | return 0; | |
342 | } | |
343 | ||
344 | static struct platform_driver wm8400_regulator_driver = { | |
345 | .driver = { | |
346 | .name = "wm8400-regulator", | |
347 | }, | |
348 | .probe = wm8400_regulator_probe, | |
349 | .remove = __devexit_p(wm8400_regulator_remove), | |
350 | }; | |
351 | ||
352 | /** | |
353 | * wm8400_register_regulator - enable software control of a WM8400 regulator | |
354 | * | |
355 | * This function enables software control of a WM8400 regulator via | |
356 | * the regulator API. It is intended to be called from the | |
357 | * platform_init() callback of the WM8400 MFD driver. | |
358 | * | |
359 | * @param dev The WM8400 device to operate on. | |
360 | * @param reg The regulator to control. | |
361 | * @param initdata Regulator initdata for the regulator. | |
362 | */ | |
363 | int wm8400_register_regulator(struct device *dev, int reg, | |
364 | struct regulator_init_data *initdata) | |
365 | { | |
1909e2f6 | 366 | struct wm8400 *wm8400 = dev_get_drvdata(dev); |
42fad570 MB |
367 | |
368 | if (wm8400->regulators[reg].name) | |
369 | return -EBUSY; | |
370 | ||
371 | initdata->driver_data = wm8400; | |
372 | ||
373 | wm8400->regulators[reg].name = "wm8400-regulator"; | |
374 | wm8400->regulators[reg].id = reg; | |
375 | wm8400->regulators[reg].dev.parent = dev; | |
42fad570 MB |
376 | wm8400->regulators[reg].dev.platform_data = initdata; |
377 | ||
378 | return platform_device_register(&wm8400->regulators[reg]); | |
379 | } | |
380 | EXPORT_SYMBOL_GPL(wm8400_register_regulator); | |
381 | ||
382 | static int __init wm8400_regulator_init(void) | |
383 | { | |
384 | return platform_driver_register(&wm8400_regulator_driver); | |
385 | } | |
5a1b22be | 386 | subsys_initcall(wm8400_regulator_init); |
42fad570 MB |
387 | |
388 | static void __exit wm8400_regulator_exit(void) | |
389 | { | |
390 | platform_driver_unregister(&wm8400_regulator_driver); | |
391 | } | |
392 | module_exit(wm8400_regulator_exit); | |
393 | ||
394 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
395 | MODULE_DESCRIPTION("WM8400 regulator driver"); | |
396 | MODULE_LICENSE("GPL"); | |
397 | MODULE_ALIAS("platform:wm8400-regulator"); |