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 9
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 	char supply_name[WM831X_DCDC_MAX_NAME];
54 	struct regulator_desc desc;
55 	int base;
56 	struct wm831x *wm831x;
57 	struct regulator_dev *regulator;
58 	int dvs_gpio;
59 	int dvs_gpio_state;
60 	int on_vsel;
61 	int dvs_vsel;
62 };
63 
64 static unsigned int wm831x_dcdc_get_mode(struct regulator_dev *rdev)
65 
66 {
67 	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
68 	struct wm831x *wm831x = dcdc->wm831x;
69 	u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
70 	int val;
71 
72 	val = wm831x_reg_read(wm831x, reg);
73 	if (val < 0)
74 		return val;
75 
76 	val = (val & WM831X_DC1_ON_MODE_MASK) >> WM831X_DC1_ON_MODE_SHIFT;
77 
78 	switch (val) {
79 	case WM831X_DCDC_MODE_FAST:
80 		return REGULATOR_MODE_FAST;
81 	case WM831X_DCDC_MODE_NORMAL:
82 		return REGULATOR_MODE_NORMAL;
83 	case WM831X_DCDC_MODE_STANDBY:
84 		return REGULATOR_MODE_STANDBY;
85 	case WM831X_DCDC_MODE_IDLE:
86 		return REGULATOR_MODE_IDLE;
87 	default:
88 		BUG();
89 		return -EINVAL;
90 	}
91 }
92 
93 static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg,
94 				    unsigned int mode)
95 {
96 	int val;
97 
98 	switch (mode) {
99 	case REGULATOR_MODE_FAST:
100 		val = WM831X_DCDC_MODE_FAST;
101 		break;
102 	case REGULATOR_MODE_NORMAL:
103 		val = WM831X_DCDC_MODE_NORMAL;
104 		break;
105 	case REGULATOR_MODE_STANDBY:
106 		val = WM831X_DCDC_MODE_STANDBY;
107 		break;
108 	case REGULATOR_MODE_IDLE:
109 		val = WM831X_DCDC_MODE_IDLE;
110 		break;
111 	default:
112 		return -EINVAL;
113 	}
114 
115 	return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK,
116 			       val << WM831X_DC1_ON_MODE_SHIFT);
117 }
118 
119 static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)
120 {
121 	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
122 	struct wm831x *wm831x = dcdc->wm831x;
123 	u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
124 
125 	return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
126 }
127 
128 static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev,
129 					unsigned int mode)
130 {
131 	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
132 	struct wm831x *wm831x = dcdc->wm831x;
133 	u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
134 
135 	return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
136 }
137 
138 static int wm831x_dcdc_get_status(struct regulator_dev *rdev)
139 {
140 	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
141 	struct wm831x *wm831x = dcdc->wm831x;
142 	int ret;
143 
144 	/* First, check for errors */
145 	ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
146 	if (ret < 0)
147 		return ret;
148 
149 	if (ret & (1 << rdev_get_id(rdev))) {
150 		dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
151 			rdev_get_id(rdev) + 1);
152 		return REGULATOR_STATUS_ERROR;
153 	}
154 
155 	/* DCDC1 and DCDC2 can additionally detect high voltage/current */
156 	if (rdev_get_id(rdev) < 2) {
157 		if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) {
158 			dev_dbg(wm831x->dev, "DCDC%d over voltage\n",
159 				rdev_get_id(rdev) + 1);
160 			return REGULATOR_STATUS_ERROR;
161 		}
162 
163 		if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) {
164 			dev_dbg(wm831x->dev, "DCDC%d over current\n",
165 				rdev_get_id(rdev) + 1);
166 			return REGULATOR_STATUS_ERROR;
167 		}
168 	}
169 
170 	/* Is the regulator on? */
171 	ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
172 	if (ret < 0)
173 		return ret;
174 	if (!(ret & (1 << rdev_get_id(rdev))))
175 		return REGULATOR_STATUS_OFF;
176 
177 	/* TODO: When we handle hardware control modes so we can report the
178 	 * current mode. */
179 	return REGULATOR_STATUS_ON;
180 }
181 
182 static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data)
183 {
184 	struct wm831x_dcdc *dcdc = data;
185 
186 	regulator_notifier_call_chain(dcdc->regulator,
187 				      REGULATOR_EVENT_UNDER_VOLTAGE,
188 				      NULL);
189 
190 	return IRQ_HANDLED;
191 }
192 
193 static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data)
194 {
195 	struct wm831x_dcdc *dcdc = data;
196 
197 	regulator_notifier_call_chain(dcdc->regulator,
198 				      REGULATOR_EVENT_OVER_CURRENT,
199 				      NULL);
200 
201 	return IRQ_HANDLED;
202 }
203 
204 /*
205  * BUCKV specifics
206  */
207 
208 static const struct regulator_linear_range wm831x_buckv_ranges[] = {
209 	REGULATOR_LINEAR_RANGE(600000, 0, 0x7, 0),
210 	REGULATOR_LINEAR_RANGE(600000, 0x8, 0x68, 12500),
211 };
212 
213 static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state)
214 {
215 	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
216 
217 	if (state == dcdc->dvs_gpio_state)
218 		return 0;
219 
220 	dcdc->dvs_gpio_state = state;
221 	gpio_set_value(dcdc->dvs_gpio, state);
222 
223 	/* Should wait for DVS state change to be asserted if we have
224 	 * a GPIO for it, for now assume the device is configured
225 	 * for the fastest possible transition.
226 	 */
227 
228 	return 0;
229 }
230 
231 static int wm831x_buckv_set_voltage_sel(struct regulator_dev *rdev,
232 					unsigned vsel)
233 {
234 	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
235 	struct wm831x *wm831x = dcdc->wm831x;
236 	int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
237 	int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL;
238 	int ret;
239 
240 	/* If this value is already set then do a GPIO update if we can */
241 	if (dcdc->dvs_gpio && dcdc->on_vsel == vsel)
242 		return wm831x_buckv_set_dvs(rdev, 0);
243 
244 	if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel)
245 		return wm831x_buckv_set_dvs(rdev, 1);
246 
247 	/* Always set the ON status to the minimum voltage */
248 	ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel);
249 	if (ret < 0)
250 		return ret;
251 	dcdc->on_vsel = vsel;
252 
253 	if (!dcdc->dvs_gpio)
254 		return ret;
255 
256 	/* Kick the voltage transition now */
257 	ret = wm831x_buckv_set_dvs(rdev, 0);
258 	if (ret < 0)
259 		return ret;
260 
261 	/*
262 	 * If this VSEL is higher than the last one we've seen then
263 	 * remember it as the DVS VSEL.  This is optimised for CPUfreq
264 	 * usage where we want to get to the highest voltage very
265 	 * quickly.
266 	 */
267 	if (vsel > dcdc->dvs_vsel) {
268 		ret = wm831x_set_bits(wm831x, dvs_reg,
269 				      WM831X_DC1_DVS_VSEL_MASK,
270 				      vsel);
271 		if (ret == 0)
272 			dcdc->dvs_vsel = vsel;
273 		else
274 			dev_warn(wm831x->dev,
275 				 "Failed to set DCDC DVS VSEL: %d\n", ret);
276 	}
277 
278 	return 0;
279 }
280 
281 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
282 					    int uV)
283 {
284 	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
285 	struct wm831x *wm831x = dcdc->wm831x;
286 	u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
287 	int vsel;
288 
289 	vsel = regulator_map_voltage_linear_range(rdev, uV, uV);
290 	if (vsel < 0)
291 		return vsel;
292 
293 	return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel);
294 }
295 
296 static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev)
297 {
298 	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
299 
300 	if (dcdc->dvs_gpio && dcdc->dvs_gpio_state)
301 		return dcdc->dvs_vsel;
302 	else
303 		return dcdc->on_vsel;
304 }
305 
306 /* Current limit options */
307 static const unsigned int wm831x_dcdc_ilim[] = {
308 	125000, 250000, 375000, 500000, 625000, 750000, 875000, 1000000
309 };
310 
311 static const struct regulator_ops wm831x_buckv_ops = {
312 	.set_voltage_sel = wm831x_buckv_set_voltage_sel,
313 	.get_voltage_sel = wm831x_buckv_get_voltage_sel,
314 	.list_voltage = regulator_list_voltage_linear_range,
315 	.map_voltage = regulator_map_voltage_linear_range,
316 	.set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
317 	.set_current_limit = regulator_set_current_limit_regmap,
318 	.get_current_limit = regulator_get_current_limit_regmap,
319 
320 	.is_enabled = regulator_is_enabled_regmap,
321 	.enable = regulator_enable_regmap,
322 	.disable = regulator_disable_regmap,
323 	.get_status = wm831x_dcdc_get_status,
324 	.get_mode = wm831x_dcdc_get_mode,
325 	.set_mode = wm831x_dcdc_set_mode,
326 	.set_suspend_mode = wm831x_dcdc_set_suspend_mode,
327 };
328 
329 /*
330  * Set up DVS control.  We just log errors since we can still run
331  * (with reduced performance) if we fail.
332  */
333 static void wm831x_buckv_dvs_init(struct platform_device *pdev,
334 				  struct wm831x_dcdc *dcdc,
335 				  struct wm831x_buckv_pdata *pdata)
336 {
337 	struct wm831x *wm831x = dcdc->wm831x;
338 	int ret;
339 	u16 ctrl;
340 
341 	if (!pdata || !pdata->dvs_gpio)
342 		return;
343 
344 	/* gpiolib won't let us read the GPIO status so pick the higher
345 	 * of the two existing voltages so we take it as platform data.
346 	 */
347 	dcdc->dvs_gpio_state = pdata->dvs_init_state;
348 
349 	ret = devm_gpio_request_one(&pdev->dev, pdata->dvs_gpio,
350 				    dcdc->dvs_gpio_state ? GPIOF_INIT_HIGH : 0,
351 				    "DCDC DVS");
352 	if (ret < 0) {
353 		dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n",
354 			dcdc->name, ret);
355 		return;
356 	}
357 
358 	dcdc->dvs_gpio = pdata->dvs_gpio;
359 
360 	switch (pdata->dvs_control_src) {
361 	case 1:
362 		ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;
363 		break;
364 	case 2:
365 		ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT;
366 		break;
367 	default:
368 		dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n",
369 			pdata->dvs_control_src, dcdc->name);
370 		return;
371 	}
372 
373 	/* If DVS_VSEL is set to the minimum value then raise it to ON_VSEL
374 	 * to make bootstrapping a bit smoother.
375 	 */
376 	if (!dcdc->dvs_vsel) {
377 		ret = wm831x_set_bits(wm831x,
378 				      dcdc->base + WM831X_DCDC_DVS_CONTROL,
379 				      WM831X_DC1_DVS_VSEL_MASK, dcdc->on_vsel);
380 		if (ret == 0)
381 			dcdc->dvs_vsel = dcdc->on_vsel;
382 		else
383 			dev_warn(wm831x->dev, "Failed to set DVS_VSEL: %d\n",
384 				 ret);
385 	}
386 
387 	ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
388 			      WM831X_DC1_DVS_SRC_MASK, ctrl);
389 	if (ret < 0) {
390 		dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
391 			dcdc->name, ret);
392 	}
393 }
394 
395 static int wm831x_buckv_probe(struct platform_device *pdev)
396 {
397 	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
398 	struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
399 	struct regulator_config config = { };
400 	int id;
401 	struct wm831x_dcdc *dcdc;
402 	struct resource *res;
403 	int ret, irq;
404 
405 	if (pdata && pdata->wm831x_num)
406 		id = (pdata->wm831x_num * 10) + 1;
407 	else
408 		id = 0;
409 	id = pdev->id - id;
410 
411 	dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
412 
413 	dcdc = devm_kzalloc(&pdev->dev,  sizeof(struct wm831x_dcdc),
414 			    GFP_KERNEL);
415 	if (!dcdc)
416 		return -ENOMEM;
417 
418 	dcdc->wm831x = wm831x;
419 
420 	res = platform_get_resource(pdev, IORESOURCE_REG, 0);
421 	if (res == NULL) {
422 		dev_err(&pdev->dev, "No REG resource\n");
423 		ret = -EINVAL;
424 		goto err;
425 	}
426 	dcdc->base = res->start;
427 
428 	snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
429 	dcdc->desc.name = dcdc->name;
430 
431 	snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
432 		 "DC%dVDD", id + 1);
433 	dcdc->desc.supply_name = dcdc->supply_name;
434 
435 	dcdc->desc.id = id;
436 	dcdc->desc.type = REGULATOR_VOLTAGE;
437 	dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
438 	dcdc->desc.linear_ranges = wm831x_buckv_ranges;
439 	dcdc->desc.n_linear_ranges = ARRAY_SIZE(wm831x_buckv_ranges);
440 	dcdc->desc.ops = &wm831x_buckv_ops;
441 	dcdc->desc.owner = THIS_MODULE;
442 	dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
443 	dcdc->desc.enable_mask = 1 << id;
444 	dcdc->desc.csel_reg = dcdc->base + WM831X_DCDC_CONTROL_2;
445 	dcdc->desc.csel_mask = WM831X_DC1_HC_THR_MASK;
446 	dcdc->desc.n_current_limits = ARRAY_SIZE(wm831x_dcdc_ilim);
447 	dcdc->desc.curr_table = wm831x_dcdc_ilim;
448 
449 	ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
450 	if (ret < 0) {
451 		dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
452 		goto err;
453 	}
454 	dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
455 
456 	ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL);
457 	if (ret < 0) {
458 		dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
459 		goto err;
460 	}
461 	dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
462 
463 	if (pdata && pdata->dcdc[id])
464 		wm831x_buckv_dvs_init(pdev, dcdc,
465 				      pdata->dcdc[id]->driver_data);
466 
467 	config.dev = pdev->dev.parent;
468 	if (pdata)
469 		config.init_data = pdata->dcdc[id];
470 	config.driver_data = dcdc;
471 	config.regmap = wm831x->regmap;
472 
473 	dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
474 						  &config);
475 	if (IS_ERR(dcdc->regulator)) {
476 		ret = PTR_ERR(dcdc->regulator);
477 		dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
478 			id + 1, ret);
479 		goto err;
480 	}
481 
482 	irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
483 	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
484 					wm831x_dcdc_uv_irq,
485 					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
486 					dcdc->name, dcdc);
487 	if (ret != 0) {
488 		dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
489 			irq, ret);
490 		goto err;
491 	}
492 
493 	irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC"));
494 	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
495 					wm831x_dcdc_oc_irq,
496 					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
497 					dcdc->name, dcdc);
498 	if (ret != 0) {
499 		dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
500 			irq, ret);
501 		goto err;
502 	}
503 
504 	platform_set_drvdata(pdev, dcdc);
505 
506 	return 0;
507 
508 err:
509 	return ret;
510 }
511 
512 static struct platform_driver wm831x_buckv_driver = {
513 	.probe = wm831x_buckv_probe,
514 	.driver		= {
515 		.name	= "wm831x-buckv",
516 	},
517 };
518 
519 /*
520  * BUCKP specifics
521  */
522 
523 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev, int uV)
524 {
525 	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
526 	struct wm831x *wm831x = dcdc->wm831x;
527 	u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
528 	int sel;
529 
530 	sel = regulator_map_voltage_linear(rdev, uV, uV);
531 	if (sel < 0)
532 		return sel;
533 
534 	return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, sel);
535 }
536 
537 static const struct regulator_ops wm831x_buckp_ops = {
538 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
539 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
540 	.list_voltage = regulator_list_voltage_linear,
541 	.map_voltage = regulator_map_voltage_linear,
542 	.set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
543 
544 	.is_enabled = regulator_is_enabled_regmap,
545 	.enable = regulator_enable_regmap,
546 	.disable = regulator_disable_regmap,
547 	.get_status = wm831x_dcdc_get_status,
548 	.get_mode = wm831x_dcdc_get_mode,
549 	.set_mode = wm831x_dcdc_set_mode,
550 	.set_suspend_mode = wm831x_dcdc_set_suspend_mode,
551 };
552 
553 static int wm831x_buckp_probe(struct platform_device *pdev)
554 {
555 	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
556 	struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
557 	struct regulator_config config = { };
558 	int id;
559 	struct wm831x_dcdc *dcdc;
560 	struct resource *res;
561 	int ret, irq;
562 
563 	if (pdata && pdata->wm831x_num)
564 		id = (pdata->wm831x_num * 10) + 1;
565 	else
566 		id = 0;
567 	id = pdev->id - id;
568 
569 	dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
570 
571 	dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc),
572 			    GFP_KERNEL);
573 	if (!dcdc)
574 		return -ENOMEM;
575 
576 	dcdc->wm831x = wm831x;
577 
578 	res = platform_get_resource(pdev, IORESOURCE_REG, 0);
579 	if (res == NULL) {
580 		dev_err(&pdev->dev, "No REG resource\n");
581 		ret = -EINVAL;
582 		goto err;
583 	}
584 	dcdc->base = res->start;
585 
586 	snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
587 	dcdc->desc.name = dcdc->name;
588 
589 	snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
590 		 "DC%dVDD", id + 1);
591 	dcdc->desc.supply_name = dcdc->supply_name;
592 
593 	dcdc->desc.id = id;
594 	dcdc->desc.type = REGULATOR_VOLTAGE;
595 	dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
596 	dcdc->desc.ops = &wm831x_buckp_ops;
597 	dcdc->desc.owner = THIS_MODULE;
598 	dcdc->desc.vsel_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
599 	dcdc->desc.vsel_mask = WM831X_DC3_ON_VSEL_MASK;
600 	dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
601 	dcdc->desc.enable_mask = 1 << id;
602 	dcdc->desc.min_uV = 850000;
603 	dcdc->desc.uV_step = 25000;
604 
605 	config.dev = pdev->dev.parent;
606 	if (pdata)
607 		config.init_data = pdata->dcdc[id];
608 	config.driver_data = dcdc;
609 	config.regmap = wm831x->regmap;
610 
611 	dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
612 						  &config);
613 	if (IS_ERR(dcdc->regulator)) {
614 		ret = PTR_ERR(dcdc->regulator);
615 		dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
616 			id + 1, ret);
617 		goto err;
618 	}
619 
620 	irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
621 	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
622 					wm831x_dcdc_uv_irq,
623 					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
624 					dcdc->name, dcdc);
625 	if (ret != 0) {
626 		dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
627 			irq, ret);
628 		goto err;
629 	}
630 
631 	platform_set_drvdata(pdev, dcdc);
632 
633 	return 0;
634 
635 err:
636 	return ret;
637 }
638 
639 static struct platform_driver wm831x_buckp_driver = {
640 	.probe = wm831x_buckp_probe,
641 	.driver		= {
642 		.name	= "wm831x-buckp",
643 	},
644 };
645 
646 /*
647  * DCDC boost convertors
648  */
649 
650 static int wm831x_boostp_get_status(struct regulator_dev *rdev)
651 {
652 	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
653 	struct wm831x *wm831x = dcdc->wm831x;
654 	int ret;
655 
656 	/* First, check for errors */
657 	ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
658 	if (ret < 0)
659 		return ret;
660 
661 	if (ret & (1 << rdev_get_id(rdev))) {
662 		dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
663 			rdev_get_id(rdev) + 1);
664 		return REGULATOR_STATUS_ERROR;
665 	}
666 
667 	/* Is the regulator on? */
668 	ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
669 	if (ret < 0)
670 		return ret;
671 	if (ret & (1 << rdev_get_id(rdev)))
672 		return REGULATOR_STATUS_ON;
673 	else
674 		return REGULATOR_STATUS_OFF;
675 }
676 
677 static const struct regulator_ops wm831x_boostp_ops = {
678 	.get_status = wm831x_boostp_get_status,
679 
680 	.is_enabled = regulator_is_enabled_regmap,
681 	.enable = regulator_enable_regmap,
682 	.disable = regulator_disable_regmap,
683 };
684 
685 static int wm831x_boostp_probe(struct platform_device *pdev)
686 {
687 	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
688 	struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
689 	struct regulator_config config = { };
690 	int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
691 	struct wm831x_dcdc *dcdc;
692 	struct resource *res;
693 	int ret, irq;
694 
695 	dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
696 
697 	if (pdata == NULL || pdata->dcdc[id] == NULL)
698 		return -ENODEV;
699 
700 	dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
701 	if (!dcdc)
702 		return -ENOMEM;
703 
704 	dcdc->wm831x = wm831x;
705 
706 	res = platform_get_resource(pdev, IORESOURCE_REG, 0);
707 	if (res == NULL) {
708 		dev_err(&pdev->dev, "No REG resource\n");
709 		return -EINVAL;
710 	}
711 	dcdc->base = res->start;
712 
713 	snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
714 	dcdc->desc.name = dcdc->name;
715 	dcdc->desc.id = id;
716 	dcdc->desc.type = REGULATOR_VOLTAGE;
717 	dcdc->desc.ops = &wm831x_boostp_ops;
718 	dcdc->desc.owner = THIS_MODULE;
719 	dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
720 	dcdc->desc.enable_mask = 1 << id;
721 
722 	config.dev = pdev->dev.parent;
723 	if (pdata)
724 		config.init_data = pdata->dcdc[id];
725 	config.driver_data = dcdc;
726 	config.regmap = wm831x->regmap;
727 
728 	dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
729 						  &config);
730 	if (IS_ERR(dcdc->regulator)) {
731 		ret = PTR_ERR(dcdc->regulator);
732 		dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
733 			id + 1, ret);
734 		return ret;
735 	}
736 
737 	irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
738 	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
739 					wm831x_dcdc_uv_irq,
740 					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
741 					dcdc->name,
742 					dcdc);
743 	if (ret != 0) {
744 		dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
745 			irq, ret);
746 		return ret;
747 	}
748 
749 	platform_set_drvdata(pdev, dcdc);
750 
751 	return 0;
752 }
753 
754 static struct platform_driver wm831x_boostp_driver = {
755 	.probe = wm831x_boostp_probe,
756 	.driver		= {
757 		.name	= "wm831x-boostp",
758 	},
759 };
760 
761 /*
762  * External Power Enable
763  *
764  * These aren't actually DCDCs but look like them in hardware so share
765  * code.
766  */
767 
768 #define WM831X_EPE_BASE 6
769 
770 static const struct regulator_ops wm831x_epe_ops = {
771 	.is_enabled = regulator_is_enabled_regmap,
772 	.enable = regulator_enable_regmap,
773 	.disable = regulator_disable_regmap,
774 	.get_status = wm831x_dcdc_get_status,
775 };
776 
777 static int wm831x_epe_probe(struct platform_device *pdev)
778 {
779 	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
780 	struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
781 	struct regulator_config config = { };
782 	int id = pdev->id % ARRAY_SIZE(pdata->epe);
783 	struct wm831x_dcdc *dcdc;
784 	int ret;
785 
786 	dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
787 
788 	dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
789 	if (!dcdc)
790 		return -ENOMEM;
791 
792 	dcdc->wm831x = wm831x;
793 
794 	/* For current parts this is correct; probably need to revisit
795 	 * in future.
796 	 */
797 	snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
798 	dcdc->desc.name = dcdc->name;
799 	dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
800 	dcdc->desc.ops = &wm831x_epe_ops;
801 	dcdc->desc.type = REGULATOR_VOLTAGE;
802 	dcdc->desc.owner = THIS_MODULE;
803 	dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
804 	dcdc->desc.enable_mask = 1 << dcdc->desc.id;
805 
806 	config.dev = pdev->dev.parent;
807 	if (pdata)
808 		config.init_data = pdata->epe[id];
809 	config.driver_data = dcdc;
810 	config.regmap = wm831x->regmap;
811 
812 	dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
813 						  &config);
814 	if (IS_ERR(dcdc->regulator)) {
815 		ret = PTR_ERR(dcdc->regulator);
816 		dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
817 			id + 1, ret);
818 		goto err;
819 	}
820 
821 	platform_set_drvdata(pdev, dcdc);
822 
823 	return 0;
824 
825 err:
826 	return ret;
827 }
828 
829 static struct platform_driver wm831x_epe_driver = {
830 	.probe = wm831x_epe_probe,
831 	.driver		= {
832 		.name	= "wm831x-epe",
833 	},
834 };
835 
836 static struct platform_driver * const drivers[] = {
837 	&wm831x_buckv_driver,
838 	&wm831x_buckp_driver,
839 	&wm831x_boostp_driver,
840 	&wm831x_epe_driver,
841 };
842 
843 static int __init wm831x_dcdc_init(void)
844 {
845 	return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
846 }
847 subsys_initcall(wm831x_dcdc_init);
848 
849 static void __exit wm831x_dcdc_exit(void)
850 {
851 	platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
852 }
853 module_exit(wm831x_dcdc_exit);
854 
855 /* Module information */
856 MODULE_AUTHOR("Mark Brown");
857 MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
858 MODULE_LICENSE("GPL");
859 MODULE_ALIAS("platform:wm831x-buckv");
860 MODULE_ALIAS("platform:wm831x-buckp");
861 MODULE_ALIAS("platform:wm831x-boostp");
862 MODULE_ALIAS("platform:wm831x-epe");
863