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Blackfin: bf548-ezkit/bf561-ezkit: update nor flash layout
[zen-stable.git] / drivers / regulator / wm831x-dcdc.c
blobe93453b1b9788020646ca8e1a81964567d99710d
1 /*
2 * wm831x-dcdc.c -- DC-DC buck convertor 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/regulator/machine.h>
23 #include <linux/gpio.h>
24 #include <linux/slab.h>
25
26 #include <linux/mfd/wm831x/core.h>
27 #include <linux/mfd/wm831x/regulator.h>
28 #include <linux/mfd/wm831x/pdata.h>
29
30 #define WM831X_BUCKV_MAX_SELECTOR 0x68
31 #define WM831X_BUCKP_MAX_SELECTOR 0x66
32
33 #define WM831X_DCDC_MODE_FAST 0
34 #define WM831X_DCDC_MODE_NORMAL 1
35 #define WM831X_DCDC_MODE_IDLE 2
36 #define WM831X_DCDC_MODE_STANDBY 3
37
38 #define WM831X_DCDC_MAX_NAME 6
39
40 /* Register offsets in control block */
41 #define WM831X_DCDC_CONTROL_1 0
42 #define WM831X_DCDC_CONTROL_2 1
43 #define WM831X_DCDC_ON_CONFIG 2
44 #define WM831X_DCDC_SLEEP_CONTROL 3
45 #define WM831X_DCDC_DVS_CONTROL 4
46
47 /*
48 * Shared
49 */
50
51 struct wm831x_dcdc {
52 char name[WM831X_DCDC_MAX_NAME];
53 struct regulator_desc desc;
54 int base;
55 struct wm831x *wm831x;
56 struct regulator_dev *regulator;
57 int dvs_gpio;
58 int dvs_gpio_state;
59 int on_vsel;
60 int dvs_vsel;
61 };
62
63 static int wm831x_dcdc_is_enabled(struct regulator_dev *rdev)
64 {
65 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
66 struct wm831x *wm831x = dcdc->wm831x;
67 int mask = 1 << rdev_get_id(rdev);
68 int reg;
69
70 reg = wm831x_reg_read(wm831x, WM831X_DCDC_ENABLE);
71 if (reg < 0)
72 return reg;
73
74 if (reg & mask)
75 return 1;
76 else
77 return 0;
78 }
79
80 static int wm831x_dcdc_enable(struct regulator_dev *rdev)
81 {
82 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
83 struct wm831x *wm831x = dcdc->wm831x;
84 int mask = 1 << rdev_get_id(rdev);
85
86 return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, mask);
87 }
88
89 static int wm831x_dcdc_disable(struct regulator_dev *rdev)
90 {
91 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
92 struct wm831x *wm831x = dcdc->wm831x;
93 int mask = 1 << rdev_get_id(rdev);
94
95 return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, 0);
96 }
97
98 static unsigned int wm831x_dcdc_get_mode(struct regulator_dev *rdev)
99
100 {
101 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
102 struct wm831x *wm831x = dcdc->wm831x;
103 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
104 int val;
105
106 val = wm831x_reg_read(wm831x, reg);
107 if (val < 0)
108 return val;
109
110 val = (val & WM831X_DC1_ON_MODE_MASK) >> WM831X_DC1_ON_MODE_SHIFT;
111
112 switch (val) {
113 case WM831X_DCDC_MODE_FAST:
114 return REGULATOR_MODE_FAST;
115 case WM831X_DCDC_MODE_NORMAL:
116 return REGULATOR_MODE_NORMAL;
117 case WM831X_DCDC_MODE_STANDBY:
118 return REGULATOR_MODE_STANDBY;
119 case WM831X_DCDC_MODE_IDLE:
120 return REGULATOR_MODE_IDLE;
121 default:
122 BUG();
123 return -EINVAL;
124 }
125 }
126
127 static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg,
128 unsigned int mode)
129 {
130 int val;
131
132 switch (mode) {
133 case REGULATOR_MODE_FAST:
134 val = WM831X_DCDC_MODE_FAST;
135 break;
136 case REGULATOR_MODE_NORMAL:
137 val = WM831X_DCDC_MODE_NORMAL;
138 break;
139 case REGULATOR_MODE_STANDBY:
140 val = WM831X_DCDC_MODE_STANDBY;
141 break;
142 case REGULATOR_MODE_IDLE:
143 val = WM831X_DCDC_MODE_IDLE;
144 break;
145 default:
146 return -EINVAL;
147 }
148
149 return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK,
150 val << WM831X_DC1_ON_MODE_SHIFT);
151 }
152
153 static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)
154 {
155 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
156 struct wm831x *wm831x = dcdc->wm831x;
157 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
158
159 return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
160 }
161
162 static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev,
163 unsigned int mode)
164 {
165 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
166 struct wm831x *wm831x = dcdc->wm831x;
167 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
168
169 return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
170 }
171
172 static int wm831x_dcdc_get_status(struct regulator_dev *rdev)
173 {
174 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
175 struct wm831x *wm831x = dcdc->wm831x;
176 int ret;
177
178 /* First, check for errors */
179 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
180 if (ret < 0)
181 return ret;
182
183 if (ret & (1 << rdev_get_id(rdev))) {
184 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
185 rdev_get_id(rdev) + 1);
186 return REGULATOR_STATUS_ERROR;
187 }
188
189 /* DCDC1 and DCDC2 can additionally detect high voltage/current */
190 if (rdev_get_id(rdev) < 2) {
191 if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) {
192 dev_dbg(wm831x->dev, "DCDC%d over voltage\n",
193 rdev_get_id(rdev) + 1);
194 return REGULATOR_STATUS_ERROR;
195 }
196
197 if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) {
198 dev_dbg(wm831x->dev, "DCDC%d over current\n",
199 rdev_get_id(rdev) + 1);
200 return REGULATOR_STATUS_ERROR;
201 }
202 }
203
204 /* Is the regulator on? */
205 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
206 if (ret < 0)
207 return ret;
208 if (!(ret & (1 << rdev_get_id(rdev))))
209 return REGULATOR_STATUS_OFF;
210
211 /* TODO: When we handle hardware control modes so we can report the
212 * current mode. */
213 return REGULATOR_STATUS_ON;
214 }
215
216 static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data)
217 {
218 struct wm831x_dcdc *dcdc = data;
219
220 regulator_notifier_call_chain(dcdc->regulator,
221 REGULATOR_EVENT_UNDER_VOLTAGE,
222 NULL);
223
224 return IRQ_HANDLED;
225 }
226
227 static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data)
228 {
229 struct wm831x_dcdc *dcdc = data;
230
231 regulator_notifier_call_chain(dcdc->regulator,
232 REGULATOR_EVENT_OVER_CURRENT,
233 NULL);
234
235 return IRQ_HANDLED;
236 }
237
238 /*
239 * BUCKV specifics
240 */
241
242 static int wm831x_buckv_list_voltage(struct regulator_dev *rdev,
243 unsigned selector)
244 {
245 if (selector <= 0x8)
246 return 600000;
247 if (selector <= WM831X_BUCKV_MAX_SELECTOR)
248 return 600000 + ((selector - 0x8) * 12500);
249 return -EINVAL;
250 }
251
252 static int wm831x_buckv_select_min_voltage(struct regulator_dev *rdev,
253 int min_uV, int max_uV)
254 {
255 u16 vsel;
256
257 if (min_uV < 600000)
258 vsel = 0;
259 else if (min_uV <= 1800000)
260 vsel = ((min_uV - 600000) / 12500) + 8;
261 else
262 return -EINVAL;
263
264 if (wm831x_buckv_list_voltage(rdev, vsel) > max_uV)
265 return -EINVAL;
266
267 return vsel;
268 }
269
270 static int wm831x_buckv_select_max_voltage(struct regulator_dev *rdev,
271 int min_uV, int max_uV)
272 {
273 u16 vsel;
274
275 if (max_uV < 600000 || max_uV > 1800000)
276 return -EINVAL;
277
278 vsel = ((max_uV - 600000) / 12500) + 8;
279
280 if (wm831x_buckv_list_voltage(rdev, vsel) < min_uV ||
281 wm831x_buckv_list_voltage(rdev, vsel) < max_uV)
282 return -EINVAL;
283
284 return vsel;
285 }
286
287 static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state)
288 {
289 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
290
291 if (state == dcdc->dvs_gpio_state)
292 return 0;
293
294 dcdc->dvs_gpio_state = state;
295 gpio_set_value(dcdc->dvs_gpio, state);
296
297 /* Should wait for DVS state change to be asserted if we have
298 * a GPIO for it, for now assume the device is configured
299 * for the fastest possible transition.
300 */
301
302 return 0;
303 }
304
305 static int wm831x_buckv_set_voltage(struct regulator_dev *rdev,
306 int min_uV, int max_uV, unsigned *selector)
307 {
308 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
309 struct wm831x *wm831x = dcdc->wm831x;
310 int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
311 int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL;
312 int vsel, ret;
313
314 vsel = wm831x_buckv_select_min_voltage(rdev, min_uV, max_uV);
315 if (vsel < 0)
316 return vsel;
317
318 *selector = vsel;
319
320 /* If this value is already set then do a GPIO update if we can */
321 if (dcdc->dvs_gpio && dcdc->on_vsel == vsel)
322 return wm831x_buckv_set_dvs(rdev, 0);
323
324 if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel)
325 return wm831x_buckv_set_dvs(rdev, 1);
326
327 /* Always set the ON status to the minimum voltage */
328 ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel);
329 if (ret < 0)
330 return ret;
331 dcdc->on_vsel = vsel;
332
333 if (!dcdc->dvs_gpio)
334 return ret;
335
336 /* Kick the voltage transition now */
337 ret = wm831x_buckv_set_dvs(rdev, 0);
338 if (ret < 0)
339 return ret;
340
341 /* Set the high voltage as the DVS voltage. This is optimised
342 * for CPUfreq usage, most processors will keep the maximum
343 * voltage constant and lower the minimum with the frequency. */
344 vsel = wm831x_buckv_select_max_voltage(rdev, min_uV, max_uV);
345 if (vsel < 0) {
346 /* This should never happen - at worst the same vsel
347 * should be chosen */
348 WARN_ON(vsel < 0);
349 return 0;
350 }
351
352 /* Don't bother if it's the same VSEL we're already using */
353 if (vsel == dcdc->on_vsel)
354 return 0;
355
356 ret = wm831x_set_bits(wm831x, dvs_reg, WM831X_DC1_DVS_VSEL_MASK, vsel);
357 if (ret == 0)
358 dcdc->dvs_vsel = vsel;
359 else
360 dev_warn(wm831x->dev, "Failed to set DCDC DVS VSEL: %d\n",
361 ret);
362
363 return 0;
364 }
365
366 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
367 int uV)
368 {
369 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
370 struct wm831x *wm831x = dcdc->wm831x;
371 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
372 int vsel;
373
374 vsel = wm831x_buckv_select_min_voltage(rdev, uV, uV);
375 if (vsel < 0)
376 return vsel;
377
378 return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel);
379 }
380
381 static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev)
382 {
383 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
384
385 if (dcdc->dvs_gpio && dcdc->dvs_gpio_state)
386 return dcdc->dvs_vsel;
387 else
388 return dcdc->on_vsel;
389 }
390
391 /* Current limit options */
392 static u16 wm831x_dcdc_ilim[] = {
393 125, 250, 375, 500, 625, 750, 875, 1000
394 };
395
396 static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev,
397 int min_uA, int max_uA)
398 {
399 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
400 struct wm831x *wm831x = dcdc->wm831x;
401 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
402 int i;
403
404 for (i = 0; i < ARRAY_SIZE(wm831x_dcdc_ilim); i++) {
405 if (max_uA <= wm831x_dcdc_ilim[i])
406 break;
407 }
408 if (i == ARRAY_SIZE(wm831x_dcdc_ilim))
409 return -EINVAL;
410
411 return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK, i);
412 }
413
414 static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev)
415 {
416 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
417 struct wm831x *wm831x = dcdc->wm831x;
418 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
419 int val;
420
421 val = wm831x_reg_read(wm831x, reg);
422 if (val < 0)
423 return val;
424
425 return wm831x_dcdc_ilim[val & WM831X_DC1_HC_THR_MASK];
426 }
427
428 static struct regulator_ops wm831x_buckv_ops = {
429 .set_voltage = wm831x_buckv_set_voltage,
430 .get_voltage_sel = wm831x_buckv_get_voltage_sel,
431 .list_voltage = wm831x_buckv_list_voltage,
432 .set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
433 .set_current_limit = wm831x_buckv_set_current_limit,
434 .get_current_limit = wm831x_buckv_get_current_limit,
435
436 .is_enabled = wm831x_dcdc_is_enabled,
437 .enable = wm831x_dcdc_enable,
438 .disable = wm831x_dcdc_disable,
439 .get_status = wm831x_dcdc_get_status,
440 .get_mode = wm831x_dcdc_get_mode,
441 .set_mode = wm831x_dcdc_set_mode,
442 .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
443 };
444
445 /*
446 * Set up DVS control. We just log errors since we can still run
447 * (with reduced performance) if we fail.
448 */
449 static __devinit void wm831x_buckv_dvs_init(struct wm831x_dcdc *dcdc,
450 struct wm831x_buckv_pdata *pdata)
451 {
452 struct wm831x *wm831x = dcdc->wm831x;
453 int ret;
454 u16 ctrl;
455
456 if (!pdata || !pdata->dvs_gpio)
457 return;
458
459 switch (pdata->dvs_control_src) {
460 case 1:
461 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;
462 break;
463 case 2:
464 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT;
465 break;
466 default:
467 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n",
468 pdata->dvs_control_src, dcdc->name);
469 return;
470 }
471
472 ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
473 WM831X_DC1_DVS_SRC_MASK, ctrl);
474 if (ret < 0) {
475 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
476 dcdc->name, ret);
477 return;
478 }
479
480 ret = gpio_request(pdata->dvs_gpio, "DCDC DVS");
481 if (ret < 0) {
482 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n",
483 dcdc->name, ret);
484 return;
485 }
486
487 /* gpiolib won't let us read the GPIO status so pick the higher
488 * of the two existing voltages so we take it as platform data.
489 */
490 dcdc->dvs_gpio_state = pdata->dvs_init_state;
491
492 ret = gpio_direction_output(pdata->dvs_gpio, dcdc->dvs_gpio_state);
493 if (ret < 0) {
494 dev_err(wm831x->dev, "Failed to enable %s DVS GPIO: %d\n",
495 dcdc->name, ret);
496 gpio_free(pdata->dvs_gpio);
497 return;
498 }
499
500 dcdc->dvs_gpio = pdata->dvs_gpio;
501 }
502
503 static __devinit int wm831x_buckv_probe(struct platform_device *pdev)
504 {
505 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
506 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
507 int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
508 struct wm831x_dcdc *dcdc;
509 struct resource *res;
510 int ret, irq;
511
512 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
513
514 if (pdata == NULL || pdata->dcdc[id] == NULL)
515 return -ENODEV;
516
517 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
518 if (dcdc == NULL) {
519 dev_err(&pdev->dev, "Unable to allocate private data\n");
520 return -ENOMEM;
521 }
522
523 dcdc->wm831x = wm831x;
524
525 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
526 if (res == NULL) {
527 dev_err(&pdev->dev, "No I/O resource\n");
528 ret = -EINVAL;
529 goto err;
530 }
531 dcdc->base = res->start;
532
533 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
534 dcdc->desc.name = dcdc->name;
535 dcdc->desc.id = id;
536 dcdc->desc.type = REGULATOR_VOLTAGE;
537 dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
538 dcdc->desc.ops = &wm831x_buckv_ops;
539 dcdc->desc.owner = THIS_MODULE;
540
541 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
542 if (ret < 0) {
543 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
544 goto err;
545 }
546 dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
547
548 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
549 if (ret < 0) {
550 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
551 goto err;
552 }
553 dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
554
555 if (pdata->dcdc[id])
556 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data);
557
558 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
559 pdata->dcdc[id], dcdc);
560 if (IS_ERR(dcdc->regulator)) {
561 ret = PTR_ERR(dcdc->regulator);
562 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
563 id + 1, ret);
564 goto err;
565 }
566
567 irq = platform_get_irq_byname(pdev, "UV");
568 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
569 IRQF_TRIGGER_RISING, dcdc->name, dcdc);
570 if (ret != 0) {
571 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
572 irq, ret);
573 goto err_regulator;
574 }
575
576 irq = platform_get_irq_byname(pdev, "HC");
577 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_oc_irq,
578 IRQF_TRIGGER_RISING, dcdc->name, dcdc);
579 if (ret != 0) {
580 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
581 irq, ret);
582 goto err_uv;
583 }
584
585 platform_set_drvdata(pdev, dcdc);
586
587 return 0;
588
589 err_uv:
590 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
591 err_regulator:
592 regulator_unregister(dcdc->regulator);
593 err:
594 if (dcdc->dvs_gpio)
595 gpio_free(dcdc->dvs_gpio);
596 kfree(dcdc);
597 return ret;
598 }
599
600 static __devexit int wm831x_buckv_remove(struct platform_device *pdev)
601 {
602 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
603 struct wm831x *wm831x = dcdc->wm831x;
604
605 platform_set_drvdata(pdev, NULL);
606
607 free_irq(platform_get_irq_byname(pdev, "HC"), dcdc);
608 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
609 regulator_unregister(dcdc->regulator);
610 if (dcdc->dvs_gpio)
611 gpio_free(dcdc->dvs_gpio);
612 kfree(dcdc);
613
614 return 0;
615 }
616
617 static struct platform_driver wm831x_buckv_driver = {
618 .probe = wm831x_buckv_probe,
619 .remove = __devexit_p(wm831x_buckv_remove),
620 .driver = {
621 .name = "wm831x-buckv",
622 .owner = THIS_MODULE,
623 },
624 };
625
626 /*
627 * BUCKP specifics
628 */
629
630 static int wm831x_buckp_list_voltage(struct regulator_dev *rdev,
631 unsigned selector)
632 {
633 if (selector <= WM831X_BUCKP_MAX_SELECTOR)
634 return 850000 + (selector * 25000);
635 else
636 return -EINVAL;
637 }
638
639 static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg,
640 int min_uV, int max_uV, int *selector)
641 {
642 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
643 struct wm831x *wm831x = dcdc->wm831x;
644 u16 vsel;
645
646 if (min_uV <= 34000000)
647 vsel = (min_uV - 850000) / 25000;
648 else
649 return -EINVAL;
650
651 if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV)
652 return -EINVAL;
653
654 *selector = vsel;
655
656 return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel);
657 }
658
659 static int wm831x_buckp_set_voltage(struct regulator_dev *rdev,
660 int min_uV, int max_uV,
661 unsigned *selector)
662 {
663 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
664 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
665
666 return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV,
667 selector);
668 }
669
670 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev,
671 int uV)
672 {
673 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
674 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
675 unsigned selector;
676
677 return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV, &selector);
678 }
679
680 static int wm831x_buckp_get_voltage_sel(struct regulator_dev *rdev)
681 {
682 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
683 struct wm831x *wm831x = dcdc->wm831x;
684 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
685 int val;
686
687 val = wm831x_reg_read(wm831x, reg);
688 if (val < 0)
689 return val;
690
691 return val & WM831X_DC3_ON_VSEL_MASK;
692 }
693
694 static struct regulator_ops wm831x_buckp_ops = {
695 .set_voltage = wm831x_buckp_set_voltage,
696 .get_voltage_sel = wm831x_buckp_get_voltage_sel,
697 .list_voltage = wm831x_buckp_list_voltage,
698 .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
699
700 .is_enabled = wm831x_dcdc_is_enabled,
701 .enable = wm831x_dcdc_enable,
702 .disable = wm831x_dcdc_disable,
703 .get_status = wm831x_dcdc_get_status,
704 .get_mode = wm831x_dcdc_get_mode,
705 .set_mode = wm831x_dcdc_set_mode,
706 .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
707 };
708
709 static __devinit int wm831x_buckp_probe(struct platform_device *pdev)
710 {
711 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
712 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
713 int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
714 struct wm831x_dcdc *dcdc;
715 struct resource *res;
716 int ret, irq;
717
718 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
719
720 if (pdata == NULL || pdata->dcdc[id] == NULL)
721 return -ENODEV;
722
723 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
724 if (dcdc == NULL) {
725 dev_err(&pdev->dev, "Unable to allocate private data\n");
726 return -ENOMEM;
727 }
728
729 dcdc->wm831x = wm831x;
730
731 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
732 if (res == NULL) {
733 dev_err(&pdev->dev, "No I/O resource\n");
734 ret = -EINVAL;
735 goto err;
736 }
737 dcdc->base = res->start;
738
739 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
740 dcdc->desc.name = dcdc->name;
741 dcdc->desc.id = id;
742 dcdc->desc.type = REGULATOR_VOLTAGE;
743 dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
744 dcdc->desc.ops = &wm831x_buckp_ops;
745 dcdc->desc.owner = THIS_MODULE;
746
747 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
748 pdata->dcdc[id], dcdc);
749 if (IS_ERR(dcdc->regulator)) {
750 ret = PTR_ERR(dcdc->regulator);
751 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
752 id + 1, ret);
753 goto err;
754 }
755
756 irq = platform_get_irq_byname(pdev, "UV");
757 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
758 IRQF_TRIGGER_RISING, dcdc->name, dcdc);
759 if (ret != 0) {
760 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
761 irq, ret);
762 goto err_regulator;
763 }
764
765 platform_set_drvdata(pdev, dcdc);
766
767 return 0;
768
769 err_regulator:
770 regulator_unregister(dcdc->regulator);
771 err:
772 kfree(dcdc);
773 return ret;
774 }
775
776 static __devexit int wm831x_buckp_remove(struct platform_device *pdev)
777 {
778 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
779 struct wm831x *wm831x = dcdc->wm831x;
780
781 platform_set_drvdata(pdev, NULL);
782
783 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
784 regulator_unregister(dcdc->regulator);
785 kfree(dcdc);
786
787 return 0;
788 }
789
790 static struct platform_driver wm831x_buckp_driver = {
791 .probe = wm831x_buckp_probe,
792 .remove = __devexit_p(wm831x_buckp_remove),
793 .driver = {
794 .name = "wm831x-buckp",
795 .owner = THIS_MODULE,
796 },
797 };
798
799 /*
800 * DCDC boost convertors
801 */
802
803 static int wm831x_boostp_get_status(struct regulator_dev *rdev)
804 {
805 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
806 struct wm831x *wm831x = dcdc->wm831x;
807 int ret;
808
809 /* First, check for errors */
810 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
811 if (ret < 0)
812 return ret;
813
814 if (ret & (1 << rdev_get_id(rdev))) {
815 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
816 rdev_get_id(rdev) + 1);
817 return REGULATOR_STATUS_ERROR;
818 }
819
820 /* Is the regulator on? */
821 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
822 if (ret < 0)
823 return ret;
824 if (ret & (1 << rdev_get_id(rdev)))
825 return REGULATOR_STATUS_ON;
826 else
827 return REGULATOR_STATUS_OFF;
828 }
829
830 static struct regulator_ops wm831x_boostp_ops = {
831 .get_status = wm831x_boostp_get_status,
832
833 .is_enabled = wm831x_dcdc_is_enabled,
834 .enable = wm831x_dcdc_enable,
835 .disable = wm831x_dcdc_disable,
836 };
837
838 static __devinit int wm831x_boostp_probe(struct platform_device *pdev)
839 {
840 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
841 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
842 int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
843 struct wm831x_dcdc *dcdc;
844 struct resource *res;
845 int ret, irq;
846
847 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
848
849 if (pdata == NULL || pdata->dcdc[id] == NULL)
850 return -ENODEV;
851
852 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
853 if (dcdc == NULL) {
854 dev_err(&pdev->dev, "Unable to allocate private data\n");
855 return -ENOMEM;
856 }
857
858 dcdc->wm831x = wm831x;
859
860 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
861 if (res == NULL) {
862 dev_err(&pdev->dev, "No I/O resource\n");
863 ret = -EINVAL;
864 goto err;
865 }
866 dcdc->base = res->start;
867
868 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
869 dcdc->desc.name = dcdc->name;
870 dcdc->desc.id = id;
871 dcdc->desc.type = REGULATOR_VOLTAGE;
872 dcdc->desc.ops = &wm831x_boostp_ops;
873 dcdc->desc.owner = THIS_MODULE;
874
875 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
876 pdata->dcdc[id], dcdc);
877 if (IS_ERR(dcdc->regulator)) {
878 ret = PTR_ERR(dcdc->regulator);
879 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
880 id + 1, ret);
881 goto err;
882 }
883
884 irq = platform_get_irq_byname(pdev, "UV");
885 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
886 IRQF_TRIGGER_RISING, dcdc->name,
887 dcdc);
888 if (ret != 0) {
889 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
890 irq, ret);
891 goto err_regulator;
892 }
893
894 platform_set_drvdata(pdev, dcdc);
895
896 return 0;
897
898 err_regulator:
899 regulator_unregister(dcdc->regulator);
900 err:
901 kfree(dcdc);
902 return ret;
903 }
904
905 static __devexit int wm831x_boostp_remove(struct platform_device *pdev)
906 {
907 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
908
909 platform_set_drvdata(pdev, NULL);
910
911 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
912 regulator_unregister(dcdc->regulator);
913 kfree(dcdc);
914
915 return 0;
916 }
917
918 static struct platform_driver wm831x_boostp_driver = {
919 .probe = wm831x_boostp_probe,
920 .remove = __devexit_p(wm831x_boostp_remove),
921 .driver = {
922 .name = "wm831x-boostp",
923 .owner = THIS_MODULE,
924 },
925 };
926
927 /*
928 * External Power Enable
929 *
930 * These aren't actually DCDCs but look like them in hardware so share
931 * code.
932 */
933
934 #define WM831X_EPE_BASE 6
935
936 static struct regulator_ops wm831x_epe_ops = {
937 .is_enabled = wm831x_dcdc_is_enabled,
938 .enable = wm831x_dcdc_enable,
939 .disable = wm831x_dcdc_disable,
940 .get_status = wm831x_dcdc_get_status,
941 };
942
943 static __devinit int wm831x_epe_probe(struct platform_device *pdev)
944 {
945 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
946 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
947 int id = pdev->id % ARRAY_SIZE(pdata->epe);
948 struct wm831x_dcdc *dcdc;
949 int ret;
950
951 dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
952
953 if (pdata == NULL || pdata->epe[id] == NULL)
954 return -ENODEV;
955
956 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
957 if (dcdc == NULL) {
958 dev_err(&pdev->dev, "Unable to allocate private data\n");
959 return -ENOMEM;
960 }
961
962 dcdc->wm831x = wm831x;
963
964 /* For current parts this is correct; probably need to revisit
965 * in future.
966 */
967 snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
968 dcdc->desc.name = dcdc->name;
969 dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
970 dcdc->desc.ops = &wm831x_epe_ops;
971 dcdc->desc.type = REGULATOR_VOLTAGE;
972 dcdc->desc.owner = THIS_MODULE;
973
974 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
975 pdata->epe[id], dcdc);
976 if (IS_ERR(dcdc->regulator)) {
977 ret = PTR_ERR(dcdc->regulator);
978 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
979 id + 1, ret);
980 goto err;
981 }
982
983 platform_set_drvdata(pdev, dcdc);
984
985 return 0;
986
987 err:
988 kfree(dcdc);
989 return ret;
990 }
991
992 static __devexit int wm831x_epe_remove(struct platform_device *pdev)
993 {
994 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
995
996 platform_set_drvdata(pdev, NULL);
997
998 regulator_unregister(dcdc->regulator);
999 kfree(dcdc);
1000
1001 return 0;
1002 }
1003
1004 static struct platform_driver wm831x_epe_driver = {
1005 .probe = wm831x_epe_probe,
1006 .remove = __devexit_p(wm831x_epe_remove),
1007 .driver = {
1008 .name = "wm831x-epe",
1009 .owner = THIS_MODULE,
1010 },
1011 };
1012
1013 static int __init wm831x_dcdc_init(void)
1014 {
1015 int ret;
1016 ret = platform_driver_register(&wm831x_buckv_driver);
1017 if (ret != 0)
1018 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret);
1019
1020 ret = platform_driver_register(&wm831x_buckp_driver);
1021 if (ret != 0)
1022 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);
1023
1024 ret = platform_driver_register(&wm831x_boostp_driver);
1025 if (ret != 0)
1026 pr_err("Failed to register WM831x BOOST driver: %d\n", ret);
1027
1028 ret = platform_driver_register(&wm831x_epe_driver);
1029 if (ret != 0)
1030 pr_err("Failed to register WM831x EPE driver: %d\n", ret);
1031
1032 return 0;
1033 }
1034 subsys_initcall(wm831x_dcdc_init);
1035
1036 static void __exit wm831x_dcdc_exit(void)
1037 {
1038 platform_driver_unregister(&wm831x_epe_driver);
1039 platform_driver_unregister(&wm831x_boostp_driver);
1040 platform_driver_unregister(&wm831x_buckp_driver);
1041 platform_driver_unregister(&wm831x_buckv_driver);
1042 }
1043 module_exit(wm831x_dcdc_exit);
1044
1045 /* Module information */
1046 MODULE_AUTHOR("Mark Brown");
1047 MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
1048 MODULE_LICENSE("GPL");
1049 MODULE_ALIAS("platform:wm831x-buckv");
1050 MODULE_ALIAS("platform:wm831x-buckp");