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regulator: Set up GPIO for WM831x VSEL before enabling VSEL mode
[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
e24a04c4
MB		 459 ret = gpio_request(pdata->dvs_gpio, "DCDC DVS");
460 if (ret < 0) {
461 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n",
462 dcdc->name, ret);
463 return;
464 }
465
466 /* gpiolib won't let us read the GPIO status so pick the higher
467 * of the two existing voltages so we take it as platform data.
468 */
469 dcdc->dvs_gpio_state = pdata->dvs_init_state;
470
471 ret = gpio_direction_output(pdata->dvs_gpio, dcdc->dvs_gpio_state);
472 if (ret < 0) {
473 dev_err(wm831x->dev, "Failed to enable %s DVS GPIO: %d\n",
474 dcdc->name, ret);
475 gpio_free(pdata->dvs_gpio);
476 return;
477 }
478
479 dcdc->dvs_gpio = pdata->dvs_gpio;
b47ba9fd
MB		 480
481 switch (pdata->dvs_control_src) {
482 case 1:
483 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;
484 break;
485 case 2:
486 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT;
487 break;
488 default:
489 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n",
490 pdata->dvs_control_src, dcdc->name);
491 return;
492 }
493
494 ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
495 WM831X_DC1_DVS_SRC_MASK, ctrl);
496 if (ret < 0) {
497 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
498 dcdc->name, ret);
499 }
e24a04c4
MB		 500}
501
e4ee831f
MB		 502static __devinit int wm831x_buckv_probe(struct platform_device *pdev)
503{
504 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
505 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
137a6354 506 int id;
e4ee831f
MB		 507 struct wm831x_dcdc *dcdc;
508 struct resource *res;
509 int ret, irq;
510
137a6354
MB		 511 if (pdata && pdata->wm831x_num)
512 id = (pdata->wm831x_num * 10) + 1;
513 else
514 id = 0;
515 id = pdev->id - id;
516
e4ee831f
MB		 517 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
518
519 if (pdata == NULL || pdata->dcdc[id] == NULL)
520 return -ENODEV;
521
522 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
523 if (dcdc == NULL) {
524 dev_err(&pdev->dev, "Unable to allocate private data\n");
525 return -ENOMEM;
526 }
527
528 dcdc->wm831x = wm831x;
529
530 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
531 if (res == NULL) {
532 dev_err(&pdev->dev, "No I/O resource\n");
533 ret = -EINVAL;
534 goto err;
535 }
536 dcdc->base = res->start;
537
538 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
539 dcdc->desc.name = dcdc->name;
540 dcdc->desc.id = id;
541 dcdc->desc.type = REGULATOR_VOLTAGE;
542 dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
543 dcdc->desc.ops = &wm831x_buckv_ops;
544 dcdc->desc.owner = THIS_MODULE;
545
e24a04c4
MB		 546 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
547 if (ret < 0) {
548 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
549 goto err;
550 }
551 dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
552
a1b81dd3 553 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL);
e24a04c4
MB		 554 if (ret < 0) {
555 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
556 goto err;
557 }
558 dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
559
560 if (pdata->dcdc[id])
561 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data);
562
e4ee831f
MB		 563 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
564 pdata->dcdc[id], dcdc);
565 if (IS_ERR(dcdc->regulator)) {
566 ret = PTR_ERR(dcdc->regulator);
567 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
568 id + 1, ret);
569 goto err;
570 }
571
572 irq = platform_get_irq_byname(pdev, "UV");
dfda9c27
MB		 573 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
574 IRQF_TRIGGER_RISING, dcdc->name, dcdc);
e4ee831f
MB		 575 if (ret != 0) {
576 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
577 irq, ret);
578 goto err_regulator;
579 }
580
581 irq = platform_get_irq_byname(pdev, "HC");
dfda9c27
MB		 582 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_oc_irq,
583 IRQF_TRIGGER_RISING, dcdc->name, dcdc);
e4ee831f
MB		 584 if (ret != 0) {
585 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
586 irq, ret);
587 goto err_uv;
588 }
589
590 platform_set_drvdata(pdev, dcdc);
591
592 return 0;
593
594err_uv:
dfda9c27 595 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
e4ee831f
MB		 596err_regulator:
597 regulator_unregister(dcdc->regulator);
598err:
e24a04c4
MB		 599 if (dcdc->dvs_gpio)
600 gpio_free(dcdc->dvs_gpio);
e4ee831f
MB		 601 kfree(dcdc);
602 return ret;
603}
604
605static __devexit int wm831x_buckv_remove(struct platform_device *pdev)
606{
607 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
e4ee831f 608
eb66d565
DT		 609 platform_set_drvdata(pdev, NULL);
610
69952369
MB		 611 free_irq(platform_get_irq_byname(pdev, "HC"), dcdc);
612 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
e4ee831f 613 regulator_unregister(dcdc->regulator);
e24a04c4
MB		 614 if (dcdc->dvs_gpio)
615 gpio_free(dcdc->dvs_gpio);
e4ee831f
MB		 616 kfree(dcdc);
617
618 return 0;
619}
620
621static struct platform_driver wm831x_buckv_driver = {
622 .probe = wm831x_buckv_probe,
623 .remove = __devexit_p(wm831x_buckv_remove),
624 .driver = {
625 .name = "wm831x-buckv",
eb66d565 626 .owner = THIS_MODULE,
e4ee831f
MB		 627 },
628};
629
630/*
631 * BUCKP specifics
632 */
633
634static int wm831x_buckp_list_voltage(struct regulator_dev *rdev,
635 unsigned selector)
636{
637 if (selector <= WM831X_BUCKP_MAX_SELECTOR)
638 return 850000 + (selector * 25000);
639 else
640 return -EINVAL;
641}
642
643static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg,
3a93f2a9 644 int min_uV, int max_uV, int *selector)
e4ee831f
MB		 645{
646 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
647 struct wm831x *wm831x = dcdc->wm831x;
648 u16 vsel;
649
650 if (min_uV <= 34000000)
651 vsel = (min_uV - 850000) / 25000;
652 else
653 return -EINVAL;
654
655 if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV)
656 return -EINVAL;
657
3a93f2a9
MB		 658 *selector = vsel;
659
e4ee831f
MB		 660 return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel);
661}
662
663static int wm831x_buckp_set_voltage(struct regulator_dev *rdev,
3a93f2a9
MB		 664 int min_uV, int max_uV,
665 unsigned *selector)
e4ee831f
MB		 666{
667 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
668 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
669
3a93f2a9
MB		 670 return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV,
671 selector);
e4ee831f
MB		 672}
673
674static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev,
675 int uV)
676{
677 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
678 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
3a93f2a9 679 unsigned selector;
e4ee831f 680
3a93f2a9 681 return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV, &selector);
e4ee831f
MB		 682}
683
afb8bb80 684static int wm831x_buckp_get_voltage_sel(struct regulator_dev *rdev)
e4ee831f
MB		 685{
686 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
687 struct wm831x *wm831x = dcdc->wm831x;
688 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
689 int val;
690
691 val = wm831x_reg_read(wm831x, reg);
692 if (val < 0)
693 return val;
694
afb8bb80 695 return val & WM831X_DC3_ON_VSEL_MASK;
e4ee831f
MB		 696}
697
698static struct regulator_ops wm831x_buckp_ops = {
699 .set_voltage = wm831x_buckp_set_voltage,
afb8bb80 700 .get_voltage_sel = wm831x_buckp_get_voltage_sel,
e4ee831f
MB		 701 .list_voltage = wm831x_buckp_list_voltage,
702 .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
703
704 .is_enabled = wm831x_dcdc_is_enabled,
705 .enable = wm831x_dcdc_enable,
706 .disable = wm831x_dcdc_disable,
707 .get_status = wm831x_dcdc_get_status,
708 .get_mode = wm831x_dcdc_get_mode,
709 .set_mode = wm831x_dcdc_set_mode,
710 .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
711};
712
713static __devinit int wm831x_buckp_probe(struct platform_device *pdev)
714{
715 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
716 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
137a6354 717 int id;
e4ee831f
MB		 718 struct wm831x_dcdc *dcdc;
719 struct resource *res;
720 int ret, irq;
721
137a6354
MB		 722 if (pdata && pdata->wm831x_num)
723 id = (pdata->wm831x_num * 10) + 1;
724 else
725 id = 0;
726 id = pdev->id - id;
727
e4ee831f
MB		 728 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
729
730 if (pdata == NULL || pdata->dcdc[id] == NULL)
731 return -ENODEV;
732
733 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
734 if (dcdc == NULL) {
735 dev_err(&pdev->dev, "Unable to allocate private data\n");
736 return -ENOMEM;
737 }
738
739 dcdc->wm831x = wm831x;
740
741 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
742 if (res == NULL) {
743 dev_err(&pdev->dev, "No I/O resource\n");
744 ret = -EINVAL;
745 goto err;
746 }
747 dcdc->base = res->start;
748
749 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
750 dcdc->desc.name = dcdc->name;
751 dcdc->desc.id = id;
752 dcdc->desc.type = REGULATOR_VOLTAGE;
753 dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
754 dcdc->desc.ops = &wm831x_buckp_ops;
755 dcdc->desc.owner = THIS_MODULE;
756
757 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
758 pdata->dcdc[id], dcdc);
759 if (IS_ERR(dcdc->regulator)) {
760 ret = PTR_ERR(dcdc->regulator);
761 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
762 id + 1, ret);
763 goto err;
764 }
765
766 irq = platform_get_irq_byname(pdev, "UV");
dfda9c27
MB		 767 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
768 IRQF_TRIGGER_RISING, dcdc->name, dcdc);
e4ee831f
MB		 769 if (ret != 0) {
770 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
771 irq, ret);
772 goto err_regulator;
773 }
774
775 platform_set_drvdata(pdev, dcdc);
776
777 return 0;
778
779err_regulator:
780 regulator_unregister(dcdc->regulator);
781err:
782 kfree(dcdc);
783 return ret;
784}
785
786static __devexit int wm831x_buckp_remove(struct platform_device *pdev)
787{
788 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
e4ee831f 789
eb66d565
DT		 790 platform_set_drvdata(pdev, NULL);
791
69952369 792 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
e4ee831f
MB		 793 regulator_unregister(dcdc->regulator);
794 kfree(dcdc);
795
796 return 0;
797}
798
799static struct platform_driver wm831x_buckp_driver = {
800 .probe = wm831x_buckp_probe,
801 .remove = __devexit_p(wm831x_buckp_remove),
802 .driver = {
803 .name = "wm831x-buckp",
eb66d565 804 .owner = THIS_MODULE,
e4ee831f
MB		 805 },
806};
807
1304850d
MB		 808/*
809 * DCDC boost convertors
810 */
811
812static int wm831x_boostp_get_status(struct regulator_dev *rdev)
813{
814 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
815 struct wm831x *wm831x = dcdc->wm831x;
816 int ret;
817
818 /* First, check for errors */
819 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
820 if (ret < 0)
821 return ret;
822
823 if (ret & (1 << rdev_get_id(rdev))) {
824 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
825 rdev_get_id(rdev) + 1);
826 return REGULATOR_STATUS_ERROR;
827 }
828
829 /* Is the regulator on? */
830 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
831 if (ret < 0)
832 return ret;
833 if (ret & (1 << rdev_get_id(rdev)))
834 return REGULATOR_STATUS_ON;
835 else
836 return REGULATOR_STATUS_OFF;
837}
838
839static struct regulator_ops wm831x_boostp_ops = {
840 .get_status = wm831x_boostp_get_status,
841
842 .is_enabled = wm831x_dcdc_is_enabled,
843 .enable = wm831x_dcdc_enable,
844 .disable = wm831x_dcdc_disable,
845};
846
847static __devinit int wm831x_boostp_probe(struct platform_device *pdev)
848{
849 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
850 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
851 int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
852 struct wm831x_dcdc *dcdc;
853 struct resource *res;
854 int ret, irq;
855
856 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
857
858 if (pdata == NULL || pdata->dcdc[id] == NULL)
859 return -ENODEV;
860
861 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
862 if (dcdc == NULL) {
863 dev_err(&pdev->dev, "Unable to allocate private data\n");
864 return -ENOMEM;
865 }
866
867 dcdc->wm831x = wm831x;
868
869 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
870 if (res == NULL) {
871 dev_err(&pdev->dev, "No I/O resource\n");
872 ret = -EINVAL;
873 goto err;
874 }
875 dcdc->base = res->start;
876
877 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
878 dcdc->desc.name = dcdc->name;
879 dcdc->desc.id = id;
880 dcdc->desc.type = REGULATOR_VOLTAGE;
881 dcdc->desc.ops = &wm831x_boostp_ops;
882 dcdc->desc.owner = THIS_MODULE;
883
884 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
885 pdata->dcdc[id], dcdc);
886 if (IS_ERR(dcdc->regulator)) {
887 ret = PTR_ERR(dcdc->regulator);
888 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
889 id + 1, ret);
890 goto err;
891 }
892
893 irq = platform_get_irq_byname(pdev, "UV");
dfda9c27
MB		 894 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
895 IRQF_TRIGGER_RISING, dcdc->name,
896 dcdc);
1304850d
MB		 897 if (ret != 0) {
898 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
899 irq, ret);
900 goto err_regulator;
901 }
902
903 platform_set_drvdata(pdev, dcdc);
904
905 return 0;
906
907err_regulator:
908 regulator_unregister(dcdc->regulator);
909err:
910 kfree(dcdc);
911 return ret;
912}
913
914static __devexit int wm831x_boostp_remove(struct platform_device *pdev)
915{
916 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
1304850d 917
eb66d565
DT		 918 platform_set_drvdata(pdev, NULL);
919
dfda9c27 920 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
1304850d
MB		 921 regulator_unregister(dcdc->regulator);
922 kfree(dcdc);
923
924 return 0;
925}
926
927static struct platform_driver wm831x_boostp_driver = {
928 .probe = wm831x_boostp_probe,
929 .remove = __devexit_p(wm831x_boostp_remove),
930 .driver = {
931 .name = "wm831x-boostp",
eb66d565 932 .owner = THIS_MODULE,
1304850d
MB		 933 },
934};
935
8267a9ba
MB		 936/*
937 * External Power Enable
938 *
939 * These aren't actually DCDCs but look like them in hardware so share
940 * code.
941 */
942
943#define WM831X_EPE_BASE 6
944
945static struct regulator_ops wm831x_epe_ops = {
946 .is_enabled = wm831x_dcdc_is_enabled,
947 .enable = wm831x_dcdc_enable,
948 .disable = wm831x_dcdc_disable,
949 .get_status = wm831x_dcdc_get_status,
950};
951
952static __devinit int wm831x_epe_probe(struct platform_device *pdev)
953{
954 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
955 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
956 int id = pdev->id % ARRAY_SIZE(pdata->epe);
957 struct wm831x_dcdc *dcdc;
958 int ret;
959
960 dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
961
962 if (pdata == NULL || pdata->epe[id] == NULL)
963 return -ENODEV;
964
965 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
966 if (dcdc == NULL) {
967 dev_err(&pdev->dev, "Unable to allocate private data\n");
968 return -ENOMEM;
969 }
970
971 dcdc->wm831x = wm831x;
972
973 /* For current parts this is correct; probably need to revisit
974 * in future.
975 */
976 snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
977 dcdc->desc.name = dcdc->name;
978 dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
979 dcdc->desc.ops = &wm831x_epe_ops;
980 dcdc->desc.type = REGULATOR_VOLTAGE;
981 dcdc->desc.owner = THIS_MODULE;
982
983 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
984 pdata->epe[id], dcdc);
985 if (IS_ERR(dcdc->regulator)) {
986 ret = PTR_ERR(dcdc->regulator);
987 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
988 id + 1, ret);
989 goto err;
990 }
991
992 platform_set_drvdata(pdev, dcdc);
993
994 return 0;
995
996err:
997 kfree(dcdc);
998 return ret;
999}
1000
1001static __devexit int wm831x_epe_remove(struct platform_device *pdev)
1002{
1003 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
1004
eb66d565
DT		 1005 platform_set_drvdata(pdev, NULL);
1006
8267a9ba
MB		 1007 regulator_unregister(dcdc->regulator);
1008 kfree(dcdc);
1009
1010 return 0;
1011}
1012
1013static struct platform_driver wm831x_epe_driver = {
1014 .probe = wm831x_epe_probe,
1015 .remove = __devexit_p(wm831x_epe_remove),
1016 .driver = {
1017 .name = "wm831x-epe",
eb66d565 1018 .owner = THIS_MODULE,
8267a9ba
MB		 1019 },
1020};
1021
e4ee831f
MB		 1022static int __init wm831x_dcdc_init(void)
1023{
1024 int ret;
1025 ret = platform_driver_register(&wm831x_buckv_driver);
1026 if (ret != 0)
1027 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret);
1028
1029 ret = platform_driver_register(&wm831x_buckp_driver);
1030 if (ret != 0)
1031 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);
1032
1304850d
MB		 1033 ret = platform_driver_register(&wm831x_boostp_driver);
1034 if (ret != 0)
1035 pr_err("Failed to register WM831x BOOST driver: %d\n", ret);
1036
8267a9ba
MB		 1037 ret = platform_driver_register(&wm831x_epe_driver);
1038 if (ret != 0)
1039 pr_err("Failed to register WM831x EPE driver: %d\n", ret);
1040
e4ee831f
MB		 1041 return 0;
1042}
1043subsys_initcall(wm831x_dcdc_init);
1044
1045static void __exit wm831x_dcdc_exit(void)
1046{
8267a9ba 1047 platform_driver_unregister(&wm831x_epe_driver);
1304850d 1048 platform_driver_unregister(&wm831x_boostp_driver);
e4ee831f
MB		 1049 platform_driver_unregister(&wm831x_buckp_driver);
1050 platform_driver_unregister(&wm831x_buckv_driver);
1051}
1052module_exit(wm831x_dcdc_exit);
1053
1054/* Module information */
1055MODULE_AUTHOR("Mark Brown");
1056MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
1057MODULE_LICENSE("GPL");
1058MODULE_ALIAS("platform:wm831x-buckv");
1059MODULE_ALIAS("platform:wm831x-buckp");
24b43150 1060MODULE_ALIAS("platform:wm831x-epe");
Linux kernel - Deliverables
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