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regulator: Fix WM831x DCDC DVS VSEL bootstrapping
[deliverable/linux.git] / drivers / regulator / wm831x-dcdc.c
CommitLineData
e4ee831f
MB		 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>
e24a04c4
MB		 22#include <linux/regulator/machine.h>
23#include <linux/gpio.h>
5a0e3ad6 24#include <linux/slab.h>
e4ee831f
MB		 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
e24a04c4 45#define WM831X_DCDC_DVS_CONTROL 4
e4ee831f
MB		 46
47/*
48 * Shared
49 */
50
51struct 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;
e24a04c4
MB		 57 int dvs_gpio;
58 int dvs_gpio_state;
59 int on_vsel;
60 int dvs_vsel;
e4ee831f
MB		 61};
62
63static 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
80static 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
89static 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
98static 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();
9ee291a4 123 return -EINVAL;
e4ee831f
MB		 124 }
125}
126
127static 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
153static 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
162static 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
172static 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
216static 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
227static 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
242static 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
e24a04c4
MB		 252static int wm831x_buckv_select_min_voltage(struct regulator_dev *rdev,
253 int min_uV, int max_uV)
e4ee831f 254{
e4ee831f
MB		 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
e24a04c4
MB		 267 return vsel;
268}
269
270static 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
287static 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;
e4ee831f
MB		 303}
304
305static int wm831x_buckv_set_voltage(struct regulator_dev *rdev,
3a93f2a9 306 int min_uV, int max_uV, unsigned *selector)
e4ee831f
MB		 307{
308 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
e24a04c4
MB		 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
3a93f2a9
MB		 318 *selector = vsel;
319
e24a04c4
MB		 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;
e4ee831f 355
e24a04c4
MB		 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;
e4ee831f
MB		 364}
365
366static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
e24a04c4 367 int uV)
e4ee831f
MB		 368{
369 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
e24a04c4 370 struct wm831x *wm831x = dcdc->wm831x;
e4ee831f 371 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
e24a04c4
MB		 372 int vsel;
373
374 vsel = wm831x_buckv_select_min_voltage(rdev, uV, uV);
375 if (vsel < 0)
376 return vsel;
e4ee831f 377
e24a04c4 378 return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel);
e4ee831f
MB		 379}
380
afb8bb80 381static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev)
e4ee831f
MB		 382{
383 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
e4ee831f 384
e24a04c4 385 if (dcdc->dvs_gpio && dcdc->dvs_gpio_state)
afb8bb80 386 return dcdc->dvs_vsel;
e24a04c4 387 else
afb8bb80 388 return dcdc->on_vsel;
e4ee831f
MB		 389}
390
391/* Current limit options */
392static u16 wm831x_dcdc_ilim[] = {
393 125, 250, 375, 500, 625, 750, 875, 1000
394};
395
396static 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
414static 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
428static struct regulator_ops wm831x_buckv_ops = {
429 .set_voltage = wm831x_buckv_set_voltage,
afb8bb80 430 .get_voltage_sel = wm831x_buckv_get_voltage_sel,
e4ee831f
MB		 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
e24a04c4
MB		 445/*
446 * Set up DVS control. We just log errors since we can still run
447 * (with reduced performance) if we fail.
448 */
449static __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
e4ee831f
MB		 503static __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;
137a6354 507 int id;
e4ee831f
MB		 508 struct wm831x_dcdc *dcdc;
509 struct resource *res;
510 int ret, irq;
511
137a6354
MB		 512 if (pdata && pdata->wm831x_num)
513 id = (pdata->wm831x_num * 10) + 1;
514 else
515 id = 0;
516 id = pdev->id - id;
517
e4ee831f
MB		 518 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
519
520 if (pdata == NULL || pdata->dcdc[id] == NULL)
521 return -ENODEV;
522
523 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
524 if (dcdc == NULL) {
525 dev_err(&pdev->dev, "Unable to allocate private data\n");
526 return -ENOMEM;
527 }
528
529 dcdc->wm831x = wm831x;
530
531 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
532 if (res == NULL) {
533 dev_err(&pdev->dev, "No I/O resource\n");
534 ret = -EINVAL;
535 goto err;
536 }
537 dcdc->base = res->start;
538
539 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
540 dcdc->desc.name = dcdc->name;
541 dcdc->desc.id = id;
542 dcdc->desc.type = REGULATOR_VOLTAGE;
543 dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
544 dcdc->desc.ops = &wm831x_buckv_ops;
545 dcdc->desc.owner = THIS_MODULE;
546
e24a04c4
MB		 547 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
548 if (ret < 0) {
549 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
550 goto err;
551 }
552 dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
553
a1b81dd3 554 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL);
e24a04c4
MB		 555 if (ret < 0) {
556 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
557 goto err;
558 }
559 dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
560
561 if (pdata->dcdc[id])
562 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data);
563
e4ee831f
MB		 564 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
565 pdata->dcdc[id], dcdc);
566 if (IS_ERR(dcdc->regulator)) {
567 ret = PTR_ERR(dcdc->regulator);
568 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
569 id + 1, ret);
570 goto err;
571 }
572
573 irq = platform_get_irq_byname(pdev, "UV");
dfda9c27
MB		 574 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
575 IRQF_TRIGGER_RISING, dcdc->name, dcdc);
e4ee831f
MB		 576 if (ret != 0) {
577 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
578 irq, ret);
579 goto err_regulator;
580 }
581
582 irq = platform_get_irq_byname(pdev, "HC");
dfda9c27
MB		 583 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_oc_irq,
584 IRQF_TRIGGER_RISING, dcdc->name, dcdc);
e4ee831f
MB		 585 if (ret != 0) {
586 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
587 irq, ret);
588 goto err_uv;
589 }
590
591 platform_set_drvdata(pdev, dcdc);
592
593 return 0;
594
595err_uv:
dfda9c27 596 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
e4ee831f
MB		 597err_regulator:
598 regulator_unregister(dcdc->regulator);
599err:
e24a04c4
MB		 600 if (dcdc->dvs_gpio)
601 gpio_free(dcdc->dvs_gpio);
e4ee831f
MB		 602 kfree(dcdc);
603 return ret;
604}
605
606static __devexit int wm831x_buckv_remove(struct platform_device *pdev)
607{
608 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
e4ee831f 609
eb66d565
DT		 610 platform_set_drvdata(pdev, NULL);
611
69952369
MB		 612 free_irq(platform_get_irq_byname(pdev, "HC"), dcdc);
613 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
e4ee831f 614 regulator_unregister(dcdc->regulator);
e24a04c4
MB		 615 if (dcdc->dvs_gpio)
616 gpio_free(dcdc->dvs_gpio);
e4ee831f
MB		 617 kfree(dcdc);
618
619 return 0;
620}
621
622static struct platform_driver wm831x_buckv_driver = {
623 .probe = wm831x_buckv_probe,
624 .remove = __devexit_p(wm831x_buckv_remove),
625 .driver = {
626 .name = "wm831x-buckv",
eb66d565 627 .owner = THIS_MODULE,
e4ee831f
MB		 628 },
629};
630
631/*
632 * BUCKP specifics
633 */
634
635static int wm831x_buckp_list_voltage(struct regulator_dev *rdev,
636 unsigned selector)
637{
638 if (selector <= WM831X_BUCKP_MAX_SELECTOR)
639 return 850000 + (selector * 25000);
640 else
641 return -EINVAL;
642}
643
644static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg,
3a93f2a9 645 int min_uV, int max_uV, int *selector)
e4ee831f
MB		 646{
647 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
648 struct wm831x *wm831x = dcdc->wm831x;
649 u16 vsel;
650
651 if (min_uV <= 34000000)
652 vsel = (min_uV - 850000) / 25000;
653 else
654 return -EINVAL;
655
656 if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV)
657 return -EINVAL;
658
3a93f2a9
MB		 659 *selector = vsel;
660
e4ee831f
MB		 661 return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel);
662}
663
664static int wm831x_buckp_set_voltage(struct regulator_dev *rdev,
3a93f2a9
MB		 665 int min_uV, int max_uV,
666 unsigned *selector)
e4ee831f
MB		 667{
668 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
669 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
670
3a93f2a9
MB		 671 return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV,
672 selector);
e4ee831f
MB		 673}
674
675static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev,
676 int uV)
677{
678 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
679 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
3a93f2a9 680 unsigned selector;
e4ee831f 681
3a93f2a9 682 return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV, &selector);
e4ee831f
MB		 683}
684
afb8bb80 685static int wm831x_buckp_get_voltage_sel(struct regulator_dev *rdev)
e4ee831f
MB		 686{
687 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
688 struct wm831x *wm831x = dcdc->wm831x;
689 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
690 int val;
691
692 val = wm831x_reg_read(wm831x, reg);
693 if (val < 0)
694 return val;
695
afb8bb80 696 return val & WM831X_DC3_ON_VSEL_MASK;
e4ee831f
MB		 697}
698
699static struct regulator_ops wm831x_buckp_ops = {
700 .set_voltage = wm831x_buckp_set_voltage,
afb8bb80 701 .get_voltage_sel = wm831x_buckp_get_voltage_sel,
e4ee831f
MB		 702 .list_voltage = wm831x_buckp_list_voltage,
703 .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
704
705 .is_enabled = wm831x_dcdc_is_enabled,
706 .enable = wm831x_dcdc_enable,
707 .disable = wm831x_dcdc_disable,
708 .get_status = wm831x_dcdc_get_status,
709 .get_mode = wm831x_dcdc_get_mode,
710 .set_mode = wm831x_dcdc_set_mode,
711 .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
712};
713
714static __devinit int wm831x_buckp_probe(struct platform_device *pdev)
715{
716 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
717 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
137a6354 718 int id;
e4ee831f
MB		 719 struct wm831x_dcdc *dcdc;
720 struct resource *res;
721 int ret, irq;
722
137a6354
MB		 723 if (pdata && pdata->wm831x_num)
724 id = (pdata->wm831x_num * 10) + 1;
725 else
726 id = 0;
727 id = pdev->id - id;
728
e4ee831f
MB		 729 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
730
731 if (pdata == NULL || pdata->dcdc[id] == NULL)
732 return -ENODEV;
733
734 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
735 if (dcdc == NULL) {
736 dev_err(&pdev->dev, "Unable to allocate private data\n");
737 return -ENOMEM;
738 }
739
740 dcdc->wm831x = wm831x;
741
742 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
743 if (res == NULL) {
744 dev_err(&pdev->dev, "No I/O resource\n");
745 ret = -EINVAL;
746 goto err;
747 }
748 dcdc->base = res->start;
749
750 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
751 dcdc->desc.name = dcdc->name;
752 dcdc->desc.id = id;
753 dcdc->desc.type = REGULATOR_VOLTAGE;
754 dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
755 dcdc->desc.ops = &wm831x_buckp_ops;
756 dcdc->desc.owner = THIS_MODULE;
757
758 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
759 pdata->dcdc[id], dcdc);
760 if (IS_ERR(dcdc->regulator)) {
761 ret = PTR_ERR(dcdc->regulator);
762 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
763 id + 1, ret);
764 goto err;
765 }
766
767 irq = platform_get_irq_byname(pdev, "UV");
dfda9c27
MB		 768 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
769 IRQF_TRIGGER_RISING, dcdc->name, dcdc);
e4ee831f
MB		 770 if (ret != 0) {
771 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
772 irq, ret);
773 goto err_regulator;
774 }
775
776 platform_set_drvdata(pdev, dcdc);
777
778 return 0;
779
780err_regulator:
781 regulator_unregister(dcdc->regulator);
782err:
783 kfree(dcdc);
784 return ret;
785}
786
787static __devexit int wm831x_buckp_remove(struct platform_device *pdev)
788{
789 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
e4ee831f 790
eb66d565
DT		 791 platform_set_drvdata(pdev, NULL);
792
69952369 793 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
e4ee831f
MB		 794 regulator_unregister(dcdc->regulator);
795 kfree(dcdc);
796
797 return 0;
798}
799
800static struct platform_driver wm831x_buckp_driver = {
801 .probe = wm831x_buckp_probe,
802 .remove = __devexit_p(wm831x_buckp_remove),
803 .driver = {
804 .name = "wm831x-buckp",
eb66d565 805 .owner = THIS_MODULE,
e4ee831f
MB		 806 },
807};
808
1304850d
MB		 809/*
810 * DCDC boost convertors
811 */
812
813static int wm831x_boostp_get_status(struct regulator_dev *rdev)
814{
815 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
816 struct wm831x *wm831x = dcdc->wm831x;
817 int ret;
818
819 /* First, check for errors */
820 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
821 if (ret < 0)
822 return ret;
823
824 if (ret & (1 << rdev_get_id(rdev))) {
825 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
826 rdev_get_id(rdev) + 1);
827 return REGULATOR_STATUS_ERROR;
828 }
829
830 /* Is the regulator on? */
831 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
832 if (ret < 0)
833 return ret;
834 if (ret & (1 << rdev_get_id(rdev)))
835 return REGULATOR_STATUS_ON;
836 else
837 return REGULATOR_STATUS_OFF;
838}
839
840static struct regulator_ops wm831x_boostp_ops = {
841 .get_status = wm831x_boostp_get_status,
842
843 .is_enabled = wm831x_dcdc_is_enabled,
844 .enable = wm831x_dcdc_enable,
845 .disable = wm831x_dcdc_disable,
846};
847
848static __devinit int wm831x_boostp_probe(struct platform_device *pdev)
849{
850 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
851 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
852 int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
853 struct wm831x_dcdc *dcdc;
854 struct resource *res;
855 int ret, irq;
856
857 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
858
859 if (pdata == NULL || pdata->dcdc[id] == NULL)
860 return -ENODEV;
861
862 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
863 if (dcdc == NULL) {
864 dev_err(&pdev->dev, "Unable to allocate private data\n");
865 return -ENOMEM;
866 }
867
868 dcdc->wm831x = wm831x;
869
870 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
871 if (res == NULL) {
872 dev_err(&pdev->dev, "No I/O resource\n");
873 ret = -EINVAL;
874 goto err;
875 }
876 dcdc->base = res->start;
877
878 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
879 dcdc->desc.name = dcdc->name;
880 dcdc->desc.id = id;
881 dcdc->desc.type = REGULATOR_VOLTAGE;
882 dcdc->desc.ops = &wm831x_boostp_ops;
883 dcdc->desc.owner = THIS_MODULE;
884
885 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
886 pdata->dcdc[id], dcdc);
887 if (IS_ERR(dcdc->regulator)) {
888 ret = PTR_ERR(dcdc->regulator);
889 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
890 id + 1, ret);
891 goto err;
892 }
893
894 irq = platform_get_irq_byname(pdev, "UV");
dfda9c27
MB		 895 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
896 IRQF_TRIGGER_RISING, dcdc->name,
897 dcdc);
1304850d
MB		 898 if (ret != 0) {
899 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
900 irq, ret);
901 goto err_regulator;
902 }
903
904 platform_set_drvdata(pdev, dcdc);
905
906 return 0;
907
908err_regulator:
909 regulator_unregister(dcdc->regulator);
910err:
911 kfree(dcdc);
912 return ret;
913}
914
915static __devexit int wm831x_boostp_remove(struct platform_device *pdev)
916{
917 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
1304850d 918
eb66d565
DT		 919 platform_set_drvdata(pdev, NULL);
920
dfda9c27 921 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
1304850d
MB		 922 regulator_unregister(dcdc->regulator);
923 kfree(dcdc);
924
925 return 0;
926}
927
928static struct platform_driver wm831x_boostp_driver = {
929 .probe = wm831x_boostp_probe,
930 .remove = __devexit_p(wm831x_boostp_remove),
931 .driver = {
932 .name = "wm831x-boostp",
eb66d565 933 .owner = THIS_MODULE,
1304850d
MB		 934 },
935};
936
8267a9ba
MB		 937/*
938 * External Power Enable
939 *
940 * These aren't actually DCDCs but look like them in hardware so share
941 * code.
942 */
943
944#define WM831X_EPE_BASE 6
945
946static struct regulator_ops wm831x_epe_ops = {
947 .is_enabled = wm831x_dcdc_is_enabled,
948 .enable = wm831x_dcdc_enable,
949 .disable = wm831x_dcdc_disable,
950 .get_status = wm831x_dcdc_get_status,
951};
952
953static __devinit int wm831x_epe_probe(struct platform_device *pdev)
954{
955 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
956 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
957 int id = pdev->id % ARRAY_SIZE(pdata->epe);
958 struct wm831x_dcdc *dcdc;
959 int ret;
960
961 dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
962
963 if (pdata == NULL || pdata->epe[id] == NULL)
964 return -ENODEV;
965
966 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
967 if (dcdc == NULL) {
968 dev_err(&pdev->dev, "Unable to allocate private data\n");
969 return -ENOMEM;
970 }
971
972 dcdc->wm831x = wm831x;
973
974 /* For current parts this is correct; probably need to revisit
975 * in future.
976 */
977 snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
978 dcdc->desc.name = dcdc->name;
979 dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
980 dcdc->desc.ops = &wm831x_epe_ops;
981 dcdc->desc.type = REGULATOR_VOLTAGE;
982 dcdc->desc.owner = THIS_MODULE;
983
984 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
985 pdata->epe[id], dcdc);
986 if (IS_ERR(dcdc->regulator)) {
987 ret = PTR_ERR(dcdc->regulator);
988 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
989 id + 1, ret);
990 goto err;
991 }
992
993 platform_set_drvdata(pdev, dcdc);
994
995 return 0;
996
997err:
998 kfree(dcdc);
999 return ret;
1000}
1001
1002static __devexit int wm831x_epe_remove(struct platform_device *pdev)
1003{
1004 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
1005
eb66d565
DT		 1006 platform_set_drvdata(pdev, NULL);
1007
8267a9ba
MB		 1008 regulator_unregister(dcdc->regulator);
1009 kfree(dcdc);
1010
1011 return 0;
1012}
1013
1014static struct platform_driver wm831x_epe_driver = {
1015 .probe = wm831x_epe_probe,
1016 .remove = __devexit_p(wm831x_epe_remove),
1017 .driver = {
1018 .name = "wm831x-epe",
eb66d565 1019 .owner = THIS_MODULE,
8267a9ba
MB		 1020 },
1021};
1022
e4ee831f
MB		 1023static int __init wm831x_dcdc_init(void)
1024{
1025 int ret;
1026 ret = platform_driver_register(&wm831x_buckv_driver);
1027 if (ret != 0)
1028 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret);
1029
1030 ret = platform_driver_register(&wm831x_buckp_driver);
1031 if (ret != 0)
1032 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);
1033
1304850d
MB		 1034 ret = platform_driver_register(&wm831x_boostp_driver);
1035 if (ret != 0)
1036 pr_err("Failed to register WM831x BOOST driver: %d\n", ret);
1037
8267a9ba
MB		 1038 ret = platform_driver_register(&wm831x_epe_driver);
1039 if (ret != 0)
1040 pr_err("Failed to register WM831x EPE driver: %d\n", ret);
1041
e4ee831f
MB		 1042 return 0;
1043}
1044subsys_initcall(wm831x_dcdc_init);
1045
1046static void __exit wm831x_dcdc_exit(void)
1047{
8267a9ba 1048 platform_driver_unregister(&wm831x_epe_driver);
1304850d 1049 platform_driver_unregister(&wm831x_boostp_driver);
e4ee831f
MB		 1050 platform_driver_unregister(&wm831x_buckp_driver);
1051 platform_driver_unregister(&wm831x_buckv_driver);
1052}
1053module_exit(wm831x_dcdc_exit);
1054
1055/* Module information */
1056MODULE_AUTHOR("Mark Brown");
1057MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
1058MODULE_LICENSE("GPL");
1059MODULE_ALIAS("platform:wm831x-buckv");
1060MODULE_ALIAS("platform:wm831x-buckp");
Linux kernel - Deliverables
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