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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_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 | |
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 | |
66 | return wm8400_ldo_list_voltage(dev, val); |
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, |
104 | .list_voltage = wm8400_ldo_list_voltage, |
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 | |
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 | |
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, |
259 | .list_voltage = wm8400_dcdc_list_voltage, |
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, |
272 | .n_voltages = WM8400_LDO1_VSEL_MASK + 1, |
273 | .type = REGULATOR_VOLTAGE, |
274 | .owner = THIS_MODULE, |
275 | }, |
276 | { |
277 | .name = "LDO2", |
278 | .id = WM8400_LDO2, |
279 | .ops = &wm8400_ldo_ops, |
280 | .n_voltages = WM8400_LDO2_VSEL_MASK + 1, |
281 | .type = REGULATOR_VOLTAGE, |
282 | .owner = THIS_MODULE, |
283 | }, |
284 | { |
285 | .name = "LDO3", |
286 | .id = WM8400_LDO3, |
287 | .ops = &wm8400_ldo_ops, |
288 | .n_voltages = WM8400_LDO3_VSEL_MASK + 1, |
289 | .type = REGULATOR_VOLTAGE, |
290 | .owner = THIS_MODULE, |
291 | }, |
292 | { |
293 | .name = "LDO4", |
294 | .id = WM8400_LDO4, |
295 | .ops = &wm8400_ldo_ops, |
296 | .n_voltages = WM8400_LDO4_VSEL_MASK + 1, |
297 | .type = REGULATOR_VOLTAGE, |
298 | .owner = THIS_MODULE, |
299 | }, |
300 | { |
301 | .name = "DCDC1", |
302 | .id = WM8400_DCDC1, |
303 | .ops = &wm8400_dcdc_ops, |
304 | .n_voltages = WM8400_DC1_VSEL_MASK + 1, |
305 | .type = REGULATOR_VOLTAGE, |
306 | .owner = THIS_MODULE, |
307 | }, |
308 | { |
309 | .name = "DCDC2", |
310 | .id = WM8400_DCDC2, |
311 | .ops = &wm8400_dcdc_ops, |
312 | .n_voltages = WM8400_DC2_VSEL_MASK + 1, |
313 | .type = REGULATOR_VOLTAGE, |
314 | .owner = THIS_MODULE, |
315 | }, |
316 | }; |
317 | |
318 | static int __devinit wm8400_regulator_probe(struct platform_device *pdev) |
319 | { |
320 | struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]); |
321 | struct regulator_dev *rdev; |
322 | |
323 | rdev = regulator_register(®ulators[pdev->id], &pdev->dev, |
324 | pdev->dev.platform_data, wm8400); |
325 | |
326 | if (IS_ERR(rdev)) |
327 | return PTR_ERR(rdev); |
328 | |
329 | platform_set_drvdata(pdev, rdev); |
330 | |
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 | |
338 | platform_set_drvdata(pdev, NULL); |
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 | { |
366 | struct wm8400 *wm8400 = dev_get_drvdata(dev); |
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; |
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 | } |
386 | subsys_initcall(wm8400_regulator_init); |
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"); |
398 |
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