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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> | |
65602c32 | 18 | #include <linux/module.h> |
42fad570 MB |
19 | #include <linux/regulator/driver.h> |
20 | #include <linux/mfd/wm8400-private.h> | |
21 | ||
22 | static int wm8400_ldo_is_enabled(struct regulator_dev *dev) | |
23 | { | |
24 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
25 | u16 val; | |
26 | ||
27 | val = wm8400_reg_read(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev)); | |
28 | return (val & WM8400_LDO1_ENA) != 0; | |
29 | } | |
30 | ||
31 | static int wm8400_ldo_enable(struct regulator_dev *dev) | |
32 | { | |
33 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
34 | ||
35 | return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev), | |
36 | WM8400_LDO1_ENA, WM8400_LDO1_ENA); | |
37 | } | |
38 | ||
39 | static int wm8400_ldo_disable(struct regulator_dev *dev) | |
40 | { | |
41 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
42 | ||
43 | return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev), | |
44 | WM8400_LDO1_ENA, 0); | |
45 | } | |
46 | ||
216765d9 MB |
47 | static int wm8400_ldo_list_voltage(struct regulator_dev *dev, |
48 | unsigned selector) | |
49 | { | |
50 | if (selector > WM8400_LDO1_VSEL_MASK) | |
51 | return -EINVAL; | |
52 | ||
53 | if (selector < 15) | |
54 | return 900000 + (selector * 50000); | |
55 | else | |
56 | return 1600000 + ((selector - 14) * 100000); | |
57 | } | |
58 | ||
7ce8a2a0 | 59 | static int wm8400_ldo_get_voltage_sel(struct regulator_dev *dev) |
42fad570 MB |
60 | { |
61 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
62 | u16 val; | |
63 | ||
64 | val = wm8400_reg_read(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev)); | |
65 | val &= WM8400_LDO1_VSEL_MASK; | |
66 | ||
7ce8a2a0 | 67 | return val; |
42fad570 MB |
68 | } |
69 | ||
70 | static int wm8400_ldo_set_voltage(struct regulator_dev *dev, | |
3a93f2a9 | 71 | int min_uV, int max_uV, unsigned *selector) |
42fad570 MB |
72 | { |
73 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
74 | u16 val; | |
75 | ||
76 | if (min_uV < 900000 || min_uV > 3300000) | |
77 | return -EINVAL; | |
78 | ||
79 | if (min_uV < 1700000) { | |
80 | /* Steps of 50mV from 900mV; */ | |
81 | val = (min_uV - 850001) / 50000; | |
82 | ||
83 | if ((val * 50000) + 900000 > max_uV) | |
84 | return -EINVAL; | |
85 | BUG_ON((val * 50000) + 900000 < min_uV); | |
86 | } else { | |
87 | /* Steps of 100mV from 1700mV */ | |
88 | val = ((min_uV - 1600001) / 100000); | |
89 | ||
90 | if ((val * 100000) + 1700000 > max_uV) | |
91 | return -EINVAL; | |
92 | BUG_ON((val * 100000) + 1700000 < min_uV); | |
93 | ||
94 | val += 0xf; | |
95 | } | |
96 | ||
3a93f2a9 MB |
97 | *selector = val; |
98 | ||
42fad570 MB |
99 | return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev), |
100 | WM8400_LDO1_VSEL_MASK, val); | |
101 | } | |
102 | ||
103 | static struct regulator_ops wm8400_ldo_ops = { | |
104 | .is_enabled = wm8400_ldo_is_enabled, | |
105 | .enable = wm8400_ldo_enable, | |
106 | .disable = wm8400_ldo_disable, | |
216765d9 | 107 | .list_voltage = wm8400_ldo_list_voltage, |
7ce8a2a0 | 108 | .get_voltage_sel = wm8400_ldo_get_voltage_sel, |
42fad570 MB |
109 | .set_voltage = wm8400_ldo_set_voltage, |
110 | }; | |
111 | ||
112 | static int wm8400_dcdc_is_enabled(struct regulator_dev *dev) | |
113 | { | |
114 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
115 | int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; | |
116 | u16 val; | |
117 | ||
118 | val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset); | |
119 | return (val & WM8400_DC1_ENA) != 0; | |
120 | } | |
121 | ||
122 | static int wm8400_dcdc_enable(struct regulator_dev *dev) | |
123 | { | |
124 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
125 | int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; | |
126 | ||
127 | return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, | |
128 | WM8400_DC1_ENA, WM8400_DC1_ENA); | |
129 | } | |
130 | ||
131 | static int wm8400_dcdc_disable(struct regulator_dev *dev) | |
132 | { | |
133 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
134 | int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; | |
135 | ||
136 | return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, | |
137 | WM8400_DC1_ENA, 0); | |
138 | } | |
139 | ||
216765d9 MB |
140 | static int wm8400_dcdc_list_voltage(struct regulator_dev *dev, |
141 | unsigned selector) | |
142 | { | |
143 | if (selector > WM8400_DC1_VSEL_MASK) | |
144 | return -EINVAL; | |
145 | ||
146 | return 850000 + (selector * 25000); | |
147 | } | |
148 | ||
7ce8a2a0 | 149 | static int wm8400_dcdc_get_voltage_sel(struct regulator_dev *dev) |
42fad570 MB |
150 | { |
151 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
152 | u16 val; | |
153 | int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; | |
154 | ||
155 | val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset); | |
156 | val &= WM8400_DC1_VSEL_MASK; | |
157 | ||
7ce8a2a0 | 158 | return val; |
42fad570 MB |
159 | } |
160 | ||
161 | static int wm8400_dcdc_set_voltage(struct regulator_dev *dev, | |
3a93f2a9 | 162 | int min_uV, int max_uV, unsigned *selector) |
42fad570 MB |
163 | { |
164 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
165 | u16 val; | |
166 | int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; | |
167 | ||
168 | if (min_uV < 850000) | |
169 | return -EINVAL; | |
170 | ||
171 | val = (min_uV - 825001) / 25000; | |
172 | ||
173 | if (850000 + (25000 * val) > max_uV) | |
174 | return -EINVAL; | |
175 | BUG_ON(850000 + (25000 * val) < min_uV); | |
176 | ||
3a93f2a9 MB |
177 | *selector = val; |
178 | ||
42fad570 MB |
179 | return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, |
180 | WM8400_DC1_VSEL_MASK, val); | |
181 | } | |
182 | ||
183 | static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev) | |
184 | { | |
185 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
186 | int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; | |
187 | u16 data[2]; | |
188 | int ret; | |
189 | ||
190 | ret = wm8400_block_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 2, | |
191 | data); | |
192 | if (ret != 0) | |
193 | return 0; | |
194 | ||
195 | /* Datasheet: hibernate */ | |
196 | if (data[0] & WM8400_DC1_SLEEP) | |
197 | return REGULATOR_MODE_STANDBY; | |
198 | ||
199 | /* Datasheet: standby */ | |
200 | if (!(data[0] & WM8400_DC1_ACTIVE)) | |
201 | return REGULATOR_MODE_IDLE; | |
202 | ||
203 | /* Datasheet: active with or without force PWM */ | |
204 | if (data[1] & WM8400_DC1_FRC_PWM) | |
205 | return REGULATOR_MODE_FAST; | |
206 | else | |
207 | return REGULATOR_MODE_NORMAL; | |
208 | } | |
209 | ||
210 | static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode) | |
211 | { | |
212 | struct wm8400 *wm8400 = rdev_get_drvdata(dev); | |
213 | int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; | |
214 | int ret; | |
215 | ||
216 | switch (mode) { | |
217 | case REGULATOR_MODE_FAST: | |
218 | /* Datasheet: active with force PWM */ | |
219 | ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset, | |
220 | WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM); | |
221 | if (ret != 0) | |
222 | return ret; | |
223 | ||
224 | return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, | |
225 | WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, | |
226 | WM8400_DC1_ACTIVE); | |
227 | ||
228 | case REGULATOR_MODE_NORMAL: | |
229 | /* Datasheet: active */ | |
230 | ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset, | |
231 | WM8400_DC1_FRC_PWM, 0); | |
232 | if (ret != 0) | |
233 | return ret; | |
234 | ||
235 | return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, | |
236 | WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, | |
237 | WM8400_DC1_ACTIVE); | |
238 | ||
239 | case REGULATOR_MODE_IDLE: | |
240 | /* Datasheet: standby */ | |
241 | ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, | |
242 | WM8400_DC1_ACTIVE, 0); | |
243 | if (ret != 0) | |
244 | return ret; | |
245 | return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, | |
246 | WM8400_DC1_SLEEP, 0); | |
247 | ||
248 | default: | |
249 | return -EINVAL; | |
250 | } | |
251 | } | |
252 | ||
253 | static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev, | |
254 | int input_uV, int output_uV, | |
255 | int load_uA) | |
256 | { | |
257 | return REGULATOR_MODE_NORMAL; | |
258 | } | |
259 | ||
260 | static struct regulator_ops wm8400_dcdc_ops = { | |
261 | .is_enabled = wm8400_dcdc_is_enabled, | |
262 | .enable = wm8400_dcdc_enable, | |
263 | .disable = wm8400_dcdc_disable, | |
216765d9 | 264 | .list_voltage = wm8400_dcdc_list_voltage, |
7ce8a2a0 | 265 | .get_voltage_sel = wm8400_dcdc_get_voltage_sel, |
42fad570 MB |
266 | .set_voltage = wm8400_dcdc_set_voltage, |
267 | .get_mode = wm8400_dcdc_get_mode, | |
268 | .set_mode = wm8400_dcdc_set_mode, | |
269 | .get_optimum_mode = wm8400_dcdc_get_optimum_mode, | |
270 | }; | |
271 | ||
272 | static struct regulator_desc regulators[] = { | |
273 | { | |
274 | .name = "LDO1", | |
275 | .id = WM8400_LDO1, | |
276 | .ops = &wm8400_ldo_ops, | |
216765d9 | 277 | .n_voltages = WM8400_LDO1_VSEL_MASK + 1, |
42fad570 MB |
278 | .type = REGULATOR_VOLTAGE, |
279 | .owner = THIS_MODULE, | |
280 | }, | |
281 | { | |
282 | .name = "LDO2", | |
283 | .id = WM8400_LDO2, | |
284 | .ops = &wm8400_ldo_ops, | |
216765d9 | 285 | .n_voltages = WM8400_LDO2_VSEL_MASK + 1, |
42fad570 MB |
286 | .type = REGULATOR_VOLTAGE, |
287 | .owner = THIS_MODULE, | |
288 | }, | |
289 | { | |
290 | .name = "LDO3", | |
291 | .id = WM8400_LDO3, | |
292 | .ops = &wm8400_ldo_ops, | |
216765d9 | 293 | .n_voltages = WM8400_LDO3_VSEL_MASK + 1, |
42fad570 MB |
294 | .type = REGULATOR_VOLTAGE, |
295 | .owner = THIS_MODULE, | |
296 | }, | |
297 | { | |
298 | .name = "LDO4", | |
299 | .id = WM8400_LDO4, | |
300 | .ops = &wm8400_ldo_ops, | |
216765d9 | 301 | .n_voltages = WM8400_LDO4_VSEL_MASK + 1, |
42fad570 MB |
302 | .type = REGULATOR_VOLTAGE, |
303 | .owner = THIS_MODULE, | |
304 | }, | |
305 | { | |
306 | .name = "DCDC1", | |
307 | .id = WM8400_DCDC1, | |
308 | .ops = &wm8400_dcdc_ops, | |
216765d9 | 309 | .n_voltages = WM8400_DC1_VSEL_MASK + 1, |
42fad570 MB |
310 | .type = REGULATOR_VOLTAGE, |
311 | .owner = THIS_MODULE, | |
312 | }, | |
313 | { | |
314 | .name = "DCDC2", | |
315 | .id = WM8400_DCDC2, | |
316 | .ops = &wm8400_dcdc_ops, | |
216765d9 | 317 | .n_voltages = WM8400_DC2_VSEL_MASK + 1, |
42fad570 MB |
318 | .type = REGULATOR_VOLTAGE, |
319 | .owner = THIS_MODULE, | |
320 | }, | |
321 | }; | |
322 | ||
5dbdf735 | 323 | static int __devinit wm8400_regulator_probe(struct platform_device *pdev) |
42fad570 | 324 | { |
1ad02bbc | 325 | struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]); |
42fad570 MB |
326 | struct regulator_dev *rdev; |
327 | ||
328 | rdev = regulator_register(®ulators[pdev->id], &pdev->dev, | |
2c043bcb | 329 | pdev->dev.platform_data, wm8400, NULL); |
42fad570 MB |
330 | |
331 | if (IS_ERR(rdev)) | |
332 | return PTR_ERR(rdev); | |
333 | ||
1ad02bbc DT |
334 | platform_set_drvdata(pdev, rdev); |
335 | ||
42fad570 MB |
336 | return 0; |
337 | } | |
338 | ||
339 | static int __devexit wm8400_regulator_remove(struct platform_device *pdev) | |
340 | { | |
341 | struct regulator_dev *rdev = platform_get_drvdata(pdev); | |
342 | ||
1ad02bbc | 343 | platform_set_drvdata(pdev, NULL); |
42fad570 MB |
344 | regulator_unregister(rdev); |
345 | ||
346 | return 0; | |
347 | } | |
348 | ||
349 | static struct platform_driver wm8400_regulator_driver = { | |
350 | .driver = { | |
351 | .name = "wm8400-regulator", | |
352 | }, | |
353 | .probe = wm8400_regulator_probe, | |
354 | .remove = __devexit_p(wm8400_regulator_remove), | |
355 | }; | |
356 | ||
357 | /** | |
358 | * wm8400_register_regulator - enable software control of a WM8400 regulator | |
359 | * | |
360 | * This function enables software control of a WM8400 regulator via | |
361 | * the regulator API. It is intended to be called from the | |
362 | * platform_init() callback of the WM8400 MFD driver. | |
363 | * | |
364 | * @param dev The WM8400 device to operate on. | |
365 | * @param reg The regulator to control. | |
366 | * @param initdata Regulator initdata for the regulator. | |
367 | */ | |
368 | int wm8400_register_regulator(struct device *dev, int reg, | |
369 | struct regulator_init_data *initdata) | |
370 | { | |
1909e2f6 | 371 | struct wm8400 *wm8400 = dev_get_drvdata(dev); |
42fad570 MB |
372 | |
373 | if (wm8400->regulators[reg].name) | |
374 | return -EBUSY; | |
375 | ||
376 | initdata->driver_data = wm8400; | |
377 | ||
378 | wm8400->regulators[reg].name = "wm8400-regulator"; | |
379 | wm8400->regulators[reg].id = reg; | |
380 | wm8400->regulators[reg].dev.parent = dev; | |
42fad570 MB |
381 | wm8400->regulators[reg].dev.platform_data = initdata; |
382 | ||
383 | return platform_device_register(&wm8400->regulators[reg]); | |
384 | } | |
385 | EXPORT_SYMBOL_GPL(wm8400_register_regulator); | |
386 | ||
387 | static int __init wm8400_regulator_init(void) | |
388 | { | |
389 | return platform_driver_register(&wm8400_regulator_driver); | |
390 | } | |
5a1b22be | 391 | subsys_initcall(wm8400_regulator_init); |
42fad570 MB |
392 | |
393 | static void __exit wm8400_regulator_exit(void) | |
394 | { | |
395 | platform_driver_unregister(&wm8400_regulator_driver); | |
396 | } | |
397 | module_exit(wm8400_regulator_exit); | |
398 | ||
399 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
400 | MODULE_DESCRIPTION("WM8400 regulator driver"); | |
401 | MODULE_LICENSE("GPL"); | |
402 | MODULE_ALIAS("platform:wm8400-regulator"); |