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Linux 3.4.102
[linux/fpc-iii.git] / drivers / regulator / wm831x-ldo.c
blob641e9f6499d1ba30874811a1dd23eb759e1fb481
1 /*
2 * wm831x-ldo.c -- LDO driver for the WM831x series
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/i2c.h>
20 #include <linux/platform_device.h>
21 #include <linux/regulator/driver.h>
22 #include <linux/slab.h>
23
24 #include <linux/mfd/wm831x/core.h>
25 #include <linux/mfd/wm831x/regulator.h>
26 #include <linux/mfd/wm831x/pdata.h>
27
28 #define WM831X_LDO_MAX_NAME 6
29
30 #define WM831X_LDO_CONTROL 0
31 #define WM831X_LDO_ON_CONTROL 1
32 #define WM831X_LDO_SLEEP_CONTROL 2
33
34 #define WM831X_ALIVE_LDO_ON_CONTROL 0
35 #define WM831X_ALIVE_LDO_SLEEP_CONTROL 1
36
37 struct wm831x_ldo {
38 char name[WM831X_LDO_MAX_NAME];
39 struct regulator_desc desc;
40 int base;
41 struct wm831x *wm831x;
42 struct regulator_dev *regulator;
43 };
44
45 /*
46 * Shared
47 */
48
49 static int wm831x_ldo_is_enabled(struct regulator_dev *rdev)
50 {
51 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
52 struct wm831x *wm831x = ldo->wm831x;
53 int mask = 1 << rdev_get_id(rdev);
54 int reg;
55
56 reg = wm831x_reg_read(wm831x, WM831X_LDO_ENABLE);
57 if (reg < 0)
58 return reg;
59
60 if (reg & mask)
61 return 1;
62 else
63 return 0;
64 }
65
66 static int wm831x_ldo_enable(struct regulator_dev *rdev)
67 {
68 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
69 struct wm831x *wm831x = ldo->wm831x;
70 int mask = 1 << rdev_get_id(rdev);
71
72 return wm831x_set_bits(wm831x, WM831X_LDO_ENABLE, mask, mask);
73 }
74
75 static int wm831x_ldo_disable(struct regulator_dev *rdev)
76 {
77 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
78 struct wm831x *wm831x = ldo->wm831x;
79 int mask = 1 << rdev_get_id(rdev);
80
81 return wm831x_set_bits(wm831x, WM831X_LDO_ENABLE, mask, 0);
82 }
83
84 static irqreturn_t wm831x_ldo_uv_irq(int irq, void *data)
85 {
86 struct wm831x_ldo *ldo = data;
87
88 regulator_notifier_call_chain(ldo->regulator,
89 REGULATOR_EVENT_UNDER_VOLTAGE,
90 NULL);
91
92 return IRQ_HANDLED;
93 }
94
95 /*
96 * General purpose LDOs
97 */
98
99 #define WM831X_GP_LDO_SELECTOR_LOW 0xe
100 #define WM831X_GP_LDO_MAX_SELECTOR 0x1f
101
102 static int wm831x_gp_ldo_list_voltage(struct regulator_dev *rdev,
103 unsigned int selector)
104 {
105 /* 0.9-1.6V in 50mV steps */
106 if (selector <= WM831X_GP_LDO_SELECTOR_LOW)
107 return 900000 + (selector * 50000);
108 /* 1.7-3.3V in 50mV steps */
109 if (selector <= WM831X_GP_LDO_MAX_SELECTOR)
110 return 1600000 + ((selector - WM831X_GP_LDO_SELECTOR_LOW)
111 * 100000);
112 return -EINVAL;
113 }
114
115 static int wm831x_gp_ldo_set_voltage_int(struct regulator_dev *rdev, int reg,
116 int min_uV, int max_uV,
117 unsigned *selector)
118 {
119 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
120 struct wm831x *wm831x = ldo->wm831x;
121 int vsel, ret;
122
123 if (min_uV < 900000)
124 vsel = 0;
125 else if (min_uV < 1700000)
126 vsel = ((min_uV - 900000) / 50000);
127 else
128 vsel = ((min_uV - 1700000) / 100000)
129 + WM831X_GP_LDO_SELECTOR_LOW + 1;
130
131 ret = wm831x_gp_ldo_list_voltage(rdev, vsel);
132 if (ret < 0)
133 return ret;
134 if (ret < min_uV || ret > max_uV)
135 return -EINVAL;
136
137 *selector = vsel;
138
139 return wm831x_set_bits(wm831x, reg, WM831X_LDO1_ON_VSEL_MASK, vsel);
140 }
141
142 static int wm831x_gp_ldo_set_voltage(struct regulator_dev *rdev,
143 int min_uV, int max_uV,
144 unsigned *selector)
145 {
146 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
147 int reg = ldo->base + WM831X_LDO_ON_CONTROL;
148
149 return wm831x_gp_ldo_set_voltage_int(rdev, reg, min_uV, max_uV,
150 selector);
151 }
152
153 static int wm831x_gp_ldo_set_suspend_voltage(struct regulator_dev *rdev,
154 int uV)
155 {
156 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
157 int reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;
158 unsigned int selector;
159
160 return wm831x_gp_ldo_set_voltage_int(rdev, reg, uV, uV, &selector);
161 }
162
163 static int wm831x_gp_ldo_get_voltage_sel(struct regulator_dev *rdev)
164 {
165 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
166 struct wm831x *wm831x = ldo->wm831x;
167 int reg = ldo->base + WM831X_LDO_ON_CONTROL;
168 int ret;
169
170 ret = wm831x_reg_read(wm831x, reg);
171 if (ret < 0)
172 return ret;
173
174 ret &= WM831X_LDO1_ON_VSEL_MASK;
175
176 return ret;
177 }
178
179 static unsigned int wm831x_gp_ldo_get_mode(struct regulator_dev *rdev)
180 {
181 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
182 struct wm831x *wm831x = ldo->wm831x;
183 int ctrl_reg = ldo->base + WM831X_LDO_CONTROL;
184 int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
185 int ret;
186
187 ret = wm831x_reg_read(wm831x, on_reg);
188 if (ret < 0)
189 return ret;
190
191 if (!(ret & WM831X_LDO1_ON_MODE))
192 return REGULATOR_MODE_NORMAL;
193
194 ret = wm831x_reg_read(wm831x, ctrl_reg);
195 if (ret < 0)
196 return ret;
197
198 if (ret & WM831X_LDO1_LP_MODE)
199 return REGULATOR_MODE_STANDBY;
200 else
201 return REGULATOR_MODE_IDLE;
202 }
203
204 static int wm831x_gp_ldo_set_mode(struct regulator_dev *rdev,
205 unsigned int mode)
206 {
207 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
208 struct wm831x *wm831x = ldo->wm831x;
209 int ctrl_reg = ldo->base + WM831X_LDO_CONTROL;
210 int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
211 int ret;
212
213
214 switch (mode) {
215 case REGULATOR_MODE_NORMAL:
216 ret = wm831x_set_bits(wm831x, on_reg,
217 WM831X_LDO1_ON_MODE, 0);
218 if (ret < 0)
219 return ret;
220 break;
221
222 case REGULATOR_MODE_IDLE:
223 ret = wm831x_set_bits(wm831x, ctrl_reg,
224 WM831X_LDO1_LP_MODE, 0);
225 if (ret < 0)
226 return ret;
227
228 ret = wm831x_set_bits(wm831x, on_reg,
229 WM831X_LDO1_ON_MODE,
230 WM831X_LDO1_ON_MODE);
231 if (ret < 0)
232 return ret;
233 break;
234
235 case REGULATOR_MODE_STANDBY:
236 ret = wm831x_set_bits(wm831x, ctrl_reg,
237 WM831X_LDO1_LP_MODE,
238 WM831X_LDO1_LP_MODE);
239 if (ret < 0)
240 return ret;
241
242 ret = wm831x_set_bits(wm831x, on_reg,
243 WM831X_LDO1_ON_MODE,
244 WM831X_LDO1_ON_MODE);
245 if (ret < 0)
246 return ret;
247 break;
248
249 default:
250 return -EINVAL;
251 }
252
253 return 0;
254 }
255
256 static int wm831x_gp_ldo_get_status(struct regulator_dev *rdev)
257 {
258 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
259 struct wm831x *wm831x = ldo->wm831x;
260 int mask = 1 << rdev_get_id(rdev);
261 int ret;
262
263 /* Is the regulator on? */
264 ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
265 if (ret < 0)
266 return ret;
267 if (!(ret & mask))
268 return REGULATOR_STATUS_OFF;
269
270 /* Is it reporting under voltage? */
271 ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS);
272 if (ret & mask)
273 return REGULATOR_STATUS_ERROR;
274
275 ret = wm831x_gp_ldo_get_mode(rdev);
276 if (ret < 0)
277 return ret;
278 else
279 return regulator_mode_to_status(ret);
280 }
281
282 static unsigned int wm831x_gp_ldo_get_optimum_mode(struct regulator_dev *rdev,
283 int input_uV,
284 int output_uV, int load_uA)
285 {
286 if (load_uA < 20000)
287 return REGULATOR_MODE_STANDBY;
288 if (load_uA < 50000)
289 return REGULATOR_MODE_IDLE;
290 return REGULATOR_MODE_NORMAL;
291 }
292
293
294 static struct regulator_ops wm831x_gp_ldo_ops = {
295 .list_voltage = wm831x_gp_ldo_list_voltage,
296 .get_voltage_sel = wm831x_gp_ldo_get_voltage_sel,
297 .set_voltage = wm831x_gp_ldo_set_voltage,
298 .set_suspend_voltage = wm831x_gp_ldo_set_suspend_voltage,
299 .get_mode = wm831x_gp_ldo_get_mode,
300 .set_mode = wm831x_gp_ldo_set_mode,
301 .get_status = wm831x_gp_ldo_get_status,
302 .get_optimum_mode = wm831x_gp_ldo_get_optimum_mode,
303
304 .is_enabled = wm831x_ldo_is_enabled,
305 .enable = wm831x_ldo_enable,
306 .disable = wm831x_ldo_disable,
307 };
308
309 static __devinit int wm831x_gp_ldo_probe(struct platform_device *pdev)
310 {
311 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
312 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
313 int id;
314 struct wm831x_ldo *ldo;
315 struct resource *res;
316 int ret, irq;
317
318 if (pdata && pdata->wm831x_num)
319 id = (pdata->wm831x_num * 10) + 1;
320 else
321 id = 0;
322 id = pdev->id - id;
323
324 dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
325
326 if (pdata == NULL || pdata->ldo[id] == NULL)
327 return -ENODEV;
328
329 ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
330 if (ldo == NULL) {
331 dev_err(&pdev->dev, "Unable to allocate private data\n");
332 return -ENOMEM;
333 }
334
335 ldo->wm831x = wm831x;
336
337 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
338 if (res == NULL) {
339 dev_err(&pdev->dev, "No I/O resource\n");
340 ret = -EINVAL;
341 goto err;
342 }
343 ldo->base = res->start;
344
345 snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
346 ldo->desc.name = ldo->name;
347 ldo->desc.id = id;
348 ldo->desc.type = REGULATOR_VOLTAGE;
349 ldo->desc.n_voltages = WM831X_GP_LDO_MAX_SELECTOR + 1;
350 ldo->desc.ops = &wm831x_gp_ldo_ops;
351 ldo->desc.owner = THIS_MODULE;
352
353 ldo->regulator = regulator_register(&ldo->desc, &pdev->dev,
354 pdata->ldo[id], ldo, NULL);
355 if (IS_ERR(ldo->regulator)) {
356 ret = PTR_ERR(ldo->regulator);
357 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
358 id + 1, ret);
359 goto err;
360 }
361
362 irq = platform_get_irq_byname(pdev, "UV");
363 ret = request_threaded_irq(irq, NULL, wm831x_ldo_uv_irq,
364 IRQF_TRIGGER_RISING, ldo->name,
365 ldo);
366 if (ret != 0) {
367 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
368 irq, ret);
369 goto err_regulator;
370 }
371
372 platform_set_drvdata(pdev, ldo);
373
374 return 0;
375
376 err_regulator:
377 regulator_unregister(ldo->regulator);
378 err:
379 return ret;
380 }
381
382 static __devexit int wm831x_gp_ldo_remove(struct platform_device *pdev)
383 {
384 struct wm831x_ldo *ldo = platform_get_drvdata(pdev);
385
386 platform_set_drvdata(pdev, NULL);
387
388 free_irq(platform_get_irq_byname(pdev, "UV"), ldo);
389 regulator_unregister(ldo->regulator);
390
391 return 0;
392 }
393
394 static struct platform_driver wm831x_gp_ldo_driver = {
395 .probe = wm831x_gp_ldo_probe,
396 .remove = __devexit_p(wm831x_gp_ldo_remove),
397 .driver = {
398 .name = "wm831x-ldo",
399 .owner = THIS_MODULE,
400 },
401 };
402
403 /*
404 * Analogue LDOs
405 */
406
407
408 #define WM831X_ALDO_SELECTOR_LOW 0xc
409 #define WM831X_ALDO_MAX_SELECTOR 0x1f
410
411 static int wm831x_aldo_list_voltage(struct regulator_dev *rdev,
412 unsigned int selector)
413 {
414 /* 1-1.6V in 50mV steps */
415 if (selector <= WM831X_ALDO_SELECTOR_LOW)
416 return 1000000 + (selector * 50000);
417 /* 1.7-3.5V in 50mV steps */
418 if (selector <= WM831X_ALDO_MAX_SELECTOR)
419 return 1600000 + ((selector - WM831X_ALDO_SELECTOR_LOW)
420 * 100000);
421 return -EINVAL;
422 }
423
424 static int wm831x_aldo_set_voltage_int(struct regulator_dev *rdev, int reg,
425 int min_uV, int max_uV,
426 unsigned *selector)
427 {
428 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
429 struct wm831x *wm831x = ldo->wm831x;
430 int vsel, ret;
431
432 if (min_uV < 1000000)
433 vsel = 0;
434 else if (min_uV < 1700000)
435 vsel = ((min_uV - 1000000) / 50000);
436 else
437 vsel = ((min_uV - 1700000) / 100000)
438 + WM831X_ALDO_SELECTOR_LOW + 1;
439
440 ret = wm831x_aldo_list_voltage(rdev, vsel);
441 if (ret < 0)
442 return ret;
443 if (ret < min_uV || ret > max_uV)
444 return -EINVAL;
445
446 *selector = vsel;
447
448 return wm831x_set_bits(wm831x, reg, WM831X_LDO7_ON_VSEL_MASK, vsel);
449 }
450
451 static int wm831x_aldo_set_voltage(struct regulator_dev *rdev,
452 int min_uV, int max_uV, unsigned *selector)
453 {
454 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
455 int reg = ldo->base + WM831X_LDO_ON_CONTROL;
456
457 return wm831x_aldo_set_voltage_int(rdev, reg, min_uV, max_uV,
458 selector);
459 }
460
461 static int wm831x_aldo_set_suspend_voltage(struct regulator_dev *rdev,
462 int uV)
463 {
464 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
465 int reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;
466 unsigned int selector;
467
468 return wm831x_aldo_set_voltage_int(rdev, reg, uV, uV, &selector);
469 }
470
471 static int wm831x_aldo_get_voltage_sel(struct regulator_dev *rdev)
472 {
473 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
474 struct wm831x *wm831x = ldo->wm831x;
475 int reg = ldo->base + WM831X_LDO_ON_CONTROL;
476 int ret;
477
478 ret = wm831x_reg_read(wm831x, reg);
479 if (ret < 0)
480 return ret;
481
482 ret &= WM831X_LDO7_ON_VSEL_MASK;
483
484 return ret;
485 }
486
487 static unsigned int wm831x_aldo_get_mode(struct regulator_dev *rdev)
488 {
489 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
490 struct wm831x *wm831x = ldo->wm831x;
491 int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
492 int ret;
493
494 ret = wm831x_reg_read(wm831x, on_reg);
495 if (ret < 0)
496 return 0;
497
498 if (ret & WM831X_LDO7_ON_MODE)
499 return REGULATOR_MODE_IDLE;
500 else
501 return REGULATOR_MODE_NORMAL;
502 }
503
504 static int wm831x_aldo_set_mode(struct regulator_dev *rdev,
505 unsigned int mode)
506 {
507 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
508 struct wm831x *wm831x = ldo->wm831x;
509 int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
510 int ret;
511
512
513 switch (mode) {
514 case REGULATOR_MODE_NORMAL:
515 ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO7_ON_MODE, 0);
516 if (ret < 0)
517 return ret;
518 break;
519
520 case REGULATOR_MODE_IDLE:
521 ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO7_ON_MODE,
522 WM831X_LDO7_ON_MODE);
523 if (ret < 0)
524 return ret;
525 break;
526
527 default:
528 return -EINVAL;
529 }
530
531 return 0;
532 }
533
534 static int wm831x_aldo_get_status(struct regulator_dev *rdev)
535 {
536 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
537 struct wm831x *wm831x = ldo->wm831x;
538 int mask = 1 << rdev_get_id(rdev);
539 int ret;
540
541 /* Is the regulator on? */
542 ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
543 if (ret < 0)
544 return ret;
545 if (!(ret & mask))
546 return REGULATOR_STATUS_OFF;
547
548 /* Is it reporting under voltage? */
549 ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS);
550 if (ret & mask)
551 return REGULATOR_STATUS_ERROR;
552
553 ret = wm831x_aldo_get_mode(rdev);
554 if (ret < 0)
555 return ret;
556 else
557 return regulator_mode_to_status(ret);
558 }
559
560 static struct regulator_ops wm831x_aldo_ops = {
561 .list_voltage = wm831x_aldo_list_voltage,
562 .get_voltage_sel = wm831x_aldo_get_voltage_sel,
563 .set_voltage = wm831x_aldo_set_voltage,
564 .set_suspend_voltage = wm831x_aldo_set_suspend_voltage,
565 .get_mode = wm831x_aldo_get_mode,
566 .set_mode = wm831x_aldo_set_mode,
567 .get_status = wm831x_aldo_get_status,
568
569 .is_enabled = wm831x_ldo_is_enabled,
570 .enable = wm831x_ldo_enable,
571 .disable = wm831x_ldo_disable,
572 };
573
574 static __devinit int wm831x_aldo_probe(struct platform_device *pdev)
575 {
576 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
577 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
578 int id;
579 struct wm831x_ldo *ldo;
580 struct resource *res;
581 int ret, irq;
582
583 if (pdata && pdata->wm831x_num)
584 id = (pdata->wm831x_num * 10) + 1;
585 else
586 id = 0;
587 id = pdev->id - id;
588
589 dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
590
591 if (pdata == NULL || pdata->ldo[id] == NULL)
592 return -ENODEV;
593
594 ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
595 if (ldo == NULL) {
596 dev_err(&pdev->dev, "Unable to allocate private data\n");
597 return -ENOMEM;
598 }
599
600 ldo->wm831x = wm831x;
601
602 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
603 if (res == NULL) {
604 dev_err(&pdev->dev, "No I/O resource\n");
605 ret = -EINVAL;
606 goto err;
607 }
608 ldo->base = res->start;
609
610 snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
611 ldo->desc.name = ldo->name;
612 ldo->desc.id = id;
613 ldo->desc.type = REGULATOR_VOLTAGE;
614 ldo->desc.n_voltages = WM831X_ALDO_MAX_SELECTOR + 1;
615 ldo->desc.ops = &wm831x_aldo_ops;
616 ldo->desc.owner = THIS_MODULE;
617
618 ldo->regulator = regulator_register(&ldo->desc, &pdev->dev,
619 pdata->ldo[id], ldo, NULL);
620 if (IS_ERR(ldo->regulator)) {
621 ret = PTR_ERR(ldo->regulator);
622 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
623 id + 1, ret);
624 goto err;
625 }
626
627 irq = platform_get_irq_byname(pdev, "UV");
628 ret = request_threaded_irq(irq, NULL, wm831x_ldo_uv_irq,
629 IRQF_TRIGGER_RISING, ldo->name, ldo);
630 if (ret != 0) {
631 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
632 irq, ret);
633 goto err_regulator;
634 }
635
636 platform_set_drvdata(pdev, ldo);
637
638 return 0;
639
640 err_regulator:
641 regulator_unregister(ldo->regulator);
642 err:
643 return ret;
644 }
645
646 static __devexit int wm831x_aldo_remove(struct platform_device *pdev)
647 {
648 struct wm831x_ldo *ldo = platform_get_drvdata(pdev);
649
650 free_irq(platform_get_irq_byname(pdev, "UV"), ldo);
651 regulator_unregister(ldo->regulator);
652
653 return 0;
654 }
655
656 static struct platform_driver wm831x_aldo_driver = {
657 .probe = wm831x_aldo_probe,
658 .remove = __devexit_p(wm831x_aldo_remove),
659 .driver = {
660 .name = "wm831x-aldo",
661 .owner = THIS_MODULE,
662 },
663 };
664
665 /*
666 * Alive LDO
667 */
668
669 #define WM831X_ALIVE_LDO_MAX_SELECTOR 0xf
670
671 static int wm831x_alive_ldo_list_voltage(struct regulator_dev *rdev,
672 unsigned int selector)
673 {
674 /* 0.8-1.55V in 50mV steps */
675 if (selector <= WM831X_ALIVE_LDO_MAX_SELECTOR)
676 return 800000 + (selector * 50000);
677 return -EINVAL;
678 }
679
680 static int wm831x_alive_ldo_set_voltage_int(struct regulator_dev *rdev,
681 int reg,
682 int min_uV, int max_uV,
683 unsigned *selector)
684 {
685 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
686 struct wm831x *wm831x = ldo->wm831x;
687 int vsel, ret;
688
689 vsel = (min_uV - 800000) / 50000;
690
691 ret = wm831x_alive_ldo_list_voltage(rdev, vsel);
692 if (ret < 0)
693 return ret;
694 if (ret < min_uV || ret > max_uV)
695 return -EINVAL;
696
697 *selector = vsel;
698
699 return wm831x_set_bits(wm831x, reg, WM831X_LDO11_ON_VSEL_MASK, vsel);
700 }
701
702 static int wm831x_alive_ldo_set_voltage(struct regulator_dev *rdev,
703 int min_uV, int max_uV,
704 unsigned *selector)
705 {
706 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
707 int reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL;
708
709 return wm831x_alive_ldo_set_voltage_int(rdev, reg, min_uV, max_uV,
710 selector);
711 }
712
713 static int wm831x_alive_ldo_set_suspend_voltage(struct regulator_dev *rdev,
714 int uV)
715 {
716 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
717 int reg = ldo->base + WM831X_ALIVE_LDO_SLEEP_CONTROL;
718 unsigned selector;
719
720 return wm831x_alive_ldo_set_voltage_int(rdev, reg, uV, uV, &selector);
721 }
722
723 static int wm831x_alive_ldo_get_voltage_sel(struct regulator_dev *rdev)
724 {
725 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
726 struct wm831x *wm831x = ldo->wm831x;
727 int reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL;
728 int ret;
729
730 ret = wm831x_reg_read(wm831x, reg);
731 if (ret < 0)
732 return ret;
733
734 ret &= WM831X_LDO11_ON_VSEL_MASK;
735
736 return ret;
737 }
738
739 static int wm831x_alive_ldo_get_status(struct regulator_dev *rdev)
740 {
741 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
742 struct wm831x *wm831x = ldo->wm831x;
743 int mask = 1 << rdev_get_id(rdev);
744 int ret;
745
746 /* Is the regulator on? */
747 ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
748 if (ret < 0)
749 return ret;
750 if (ret & mask)
751 return REGULATOR_STATUS_ON;
752 else
753 return REGULATOR_STATUS_OFF;
754 }
755
756 static struct regulator_ops wm831x_alive_ldo_ops = {
757 .list_voltage = wm831x_alive_ldo_list_voltage,
758 .get_voltage_sel = wm831x_alive_ldo_get_voltage_sel,
759 .set_voltage = wm831x_alive_ldo_set_voltage,
760 .set_suspend_voltage = wm831x_alive_ldo_set_suspend_voltage,
761 .get_status = wm831x_alive_ldo_get_status,
762
763 .is_enabled = wm831x_ldo_is_enabled,
764 .enable = wm831x_ldo_enable,
765 .disable = wm831x_ldo_disable,
766 };
767
768 static __devinit int wm831x_alive_ldo_probe(struct platform_device *pdev)
769 {
770 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
771 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
772 int id;
773 struct wm831x_ldo *ldo;
774 struct resource *res;
775 int ret;
776
777 if (pdata && pdata->wm831x_num)
778 id = (pdata->wm831x_num * 10) + 1;
779 else
780 id = 0;
781 id = pdev->id - id;
782
783
784 dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
785
786 if (pdata == NULL || pdata->ldo[id] == NULL)
787 return -ENODEV;
788
789 ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
790 if (ldo == NULL) {
791 dev_err(&pdev->dev, "Unable to allocate private data\n");
792 return -ENOMEM;
793 }
794
795 ldo->wm831x = wm831x;
796
797 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
798 if (res == NULL) {
799 dev_err(&pdev->dev, "No I/O resource\n");
800 ret = -EINVAL;
801 goto err;
802 }
803 ldo->base = res->start;
804
805 snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
806 ldo->desc.name = ldo->name;
807 ldo->desc.id = id;
808 ldo->desc.type = REGULATOR_VOLTAGE;
809 ldo->desc.n_voltages = WM831X_ALIVE_LDO_MAX_SELECTOR + 1;
810 ldo->desc.ops = &wm831x_alive_ldo_ops;
811 ldo->desc.owner = THIS_MODULE;
812
813 ldo->regulator = regulator_register(&ldo->desc, &pdev->dev,
814 pdata->ldo[id], ldo, NULL);
815 if (IS_ERR(ldo->regulator)) {
816 ret = PTR_ERR(ldo->regulator);
817 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
818 id + 1, ret);
819 goto err;
820 }
821
822 platform_set_drvdata(pdev, ldo);
823
824 return 0;
825
826 err:
827 return ret;
828 }
829
830 static __devexit int wm831x_alive_ldo_remove(struct platform_device *pdev)
831 {
832 struct wm831x_ldo *ldo = platform_get_drvdata(pdev);
833
834 regulator_unregister(ldo->regulator);
835
836 return 0;
837 }
838
839 static struct platform_driver wm831x_alive_ldo_driver = {
840 .probe = wm831x_alive_ldo_probe,
841 .remove = __devexit_p(wm831x_alive_ldo_remove),
842 .driver = {
843 .name = "wm831x-alive-ldo",
844 .owner = THIS_MODULE,
845 },
846 };
847
848 static int __init wm831x_ldo_init(void)
849 {
850 int ret;
851
852 ret = platform_driver_register(&wm831x_gp_ldo_driver);
853 if (ret != 0)
854 pr_err("Failed to register WM831x GP LDO driver: %d\n", ret);
855
856 ret = platform_driver_register(&wm831x_aldo_driver);
857 if (ret != 0)
858 pr_err("Failed to register WM831x ALDO driver: %d\n", ret);
859
860 ret = platform_driver_register(&wm831x_alive_ldo_driver);
861 if (ret != 0)
862 pr_err("Failed to register WM831x alive LDO driver: %d\n",
863 ret);
864
865 return 0;
866 }
867 subsys_initcall(wm831x_ldo_init);
868
869 static void __exit wm831x_ldo_exit(void)
870 {
871 platform_driver_unregister(&wm831x_alive_ldo_driver);
872 platform_driver_unregister(&wm831x_aldo_driver);
873 platform_driver_unregister(&wm831x_gp_ldo_driver);
874 }
875 module_exit(wm831x_ldo_exit);
876
877 /* Module information */
878 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
879 MODULE_DESCRIPTION("WM831x LDO driver");
880 MODULE_LICENSE("GPL");
881 MODULE_ALIAS("platform:wm831x-ldo");
882 MODULE_ALIAS("platform:wm831x-aldo");
883 MODULE_ALIAS("platform:wm831x-aliveldo");
Linux with added FPC-III support