1// SPDX-License-Identifier: GPL-2.0+
  2//
  3// wm831x-dcdc.c  --  DC-DC buck converter driver for the WM831x series
  4//
  5// Copyright 2009 Wolfson Microelectronics PLC.
  6//
  7// Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
  8
  9#include <linux/module.h>
 10#include <linux/moduleparam.h>
 11#include <linux/init.h>
 12#include <linux/bitops.h>
 13#include <linux/err.h>
 14#include <linux/i2c.h>
 15#include <linux/platform_device.h>
 16#include <linux/regulator/driver.h>
 17#include <linux/regulator/machine.h>
 18#include <linux/gpio/consumer.h>
 19#include <linux/slab.h>
 20
 21#include <linux/mfd/wm831x/core.h>
 22#include <linux/mfd/wm831x/regulator.h>
 23#include <linux/mfd/wm831x/pdata.h>
 24
 25#define WM831X_BUCKV_MAX_SELECTOR 0x68
 26#define WM831X_BUCKP_MAX_SELECTOR 0x66
 27
 28#define WM831X_DCDC_MODE_FAST    0
 29#define WM831X_DCDC_MODE_NORMAL  1
 30#define WM831X_DCDC_MODE_IDLE    2
 31#define WM831X_DCDC_MODE_STANDBY 3
 32
 33#define WM831X_DCDC_MAX_NAME 9
 34
 35/* Register offsets in control block */
 36#define WM831X_DCDC_CONTROL_1     0
 37#define WM831X_DCDC_CONTROL_2     1
 38#define WM831X_DCDC_ON_CONFIG     2
 39#define WM831X_DCDC_SLEEP_CONTROL 3
 40#define WM831X_DCDC_DVS_CONTROL   4
 41
 42/*
 43 * Shared
 44 */
 45
 46struct wm831x_dcdc {
 47	char name[WM831X_DCDC_MAX_NAME];
 48	char supply_name[WM831X_DCDC_MAX_NAME];
 49	struct regulator_desc desc;
 50	int base;
 51	struct wm831x *wm831x;
 52	struct regulator_dev *regulator;
 53	struct gpio_desc *dvs_gpiod;
 54	int dvs_gpio_state;
 55	int on_vsel;
 56	int dvs_vsel;
 57};
 58
 59static unsigned int wm831x_dcdc_get_mode(struct regulator_dev *rdev)
 60
 61{
 62	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 63	struct wm831x *wm831x = dcdc->wm831x;
 64	u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 65	int val;
 66
 67	val = wm831x_reg_read(wm831x, reg);
 68	if (val < 0)
 69		return val;
 70
 71	val = (val & WM831X_DC1_ON_MODE_MASK) >> WM831X_DC1_ON_MODE_SHIFT;
 72
 73	switch (val) {
 74	case WM831X_DCDC_MODE_FAST:
 75		return REGULATOR_MODE_FAST;
 76	case WM831X_DCDC_MODE_NORMAL:
 77		return REGULATOR_MODE_NORMAL;
 78	case WM831X_DCDC_MODE_STANDBY:
 79		return REGULATOR_MODE_STANDBY;
 80	case WM831X_DCDC_MODE_IDLE:
 81		return REGULATOR_MODE_IDLE;
 82	default:
 83		BUG();
 84		return -EINVAL;
 85	}
 86}
 87
 88static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg,
 89				    unsigned int mode)
 90{
 91	int val;
 92
 93	switch (mode) {
 94	case REGULATOR_MODE_FAST:
 95		val = WM831X_DCDC_MODE_FAST;
 96		break;
 97	case REGULATOR_MODE_NORMAL:
 98		val = WM831X_DCDC_MODE_NORMAL;
 99		break;
100	case REGULATOR_MODE_STANDBY:
101		val = WM831X_DCDC_MODE_STANDBY;
102		break;
103	case REGULATOR_MODE_IDLE:
104		val = WM831X_DCDC_MODE_IDLE;
105		break;
106	default:
107		return -EINVAL;
108	}
109
110	return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK,
111			       val << WM831X_DC1_ON_MODE_SHIFT);
112}
113
114static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)
115{
116	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
117	struct wm831x *wm831x = dcdc->wm831x;
118	u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
119
120	return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
121}
122
123static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev,
124					unsigned int mode)
125{
126	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
127	struct wm831x *wm831x = dcdc->wm831x;
128	u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
129
130	return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
131}
132
133static int wm831x_dcdc_get_status(struct regulator_dev *rdev)
134{
135	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
136	struct wm831x *wm831x = dcdc->wm831x;
137	int ret;
138
139	/* First, check for errors */
140	ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
141	if (ret < 0)
142		return ret;
143
144	if (ret & (1 << rdev_get_id(rdev))) {
145		dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
146			rdev_get_id(rdev) + 1);
147		return REGULATOR_STATUS_ERROR;
148	}
149
150	/* DCDC1 and DCDC2 can additionally detect high voltage/current */
151	if (rdev_get_id(rdev) < 2) {
152		if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) {
153			dev_dbg(wm831x->dev, "DCDC%d over voltage\n",
154				rdev_get_id(rdev) + 1);
155			return REGULATOR_STATUS_ERROR;
156		}
157
158		if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) {
159			dev_dbg(wm831x->dev, "DCDC%d over current\n",
160				rdev_get_id(rdev) + 1);
161			return REGULATOR_STATUS_ERROR;
162		}
163	}
164
165	/* Is the regulator on? */
166	ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
167	if (ret < 0)
168		return ret;
169	if (!(ret & (1 << rdev_get_id(rdev))))
170		return REGULATOR_STATUS_OFF;
171
172	/* TODO: When we handle hardware control modes so we can report the
173	 * current mode. */
174	return REGULATOR_STATUS_ON;
175}
176
177static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data)
178{
179	struct wm831x_dcdc *dcdc = data;
180
181	regulator_notifier_call_chain(dcdc->regulator,
182				      REGULATOR_EVENT_UNDER_VOLTAGE,
183				      NULL);
184
185	return IRQ_HANDLED;
186}
187
188static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data)
189{
190	struct wm831x_dcdc *dcdc = data;
191
192	regulator_notifier_call_chain(dcdc->regulator,
193				      REGULATOR_EVENT_OVER_CURRENT,
194				      NULL);
195
196	return IRQ_HANDLED;
197}
198
199/*
200 * BUCKV specifics
201 */
202
203static const struct linear_range wm831x_buckv_ranges[] = {
204	REGULATOR_LINEAR_RANGE(600000, 0, 0x7, 0),
205	REGULATOR_LINEAR_RANGE(600000, 0x8, 0x68, 12500),
206};
207
208static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state)
209{
210	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
211
212	if (state == dcdc->dvs_gpio_state)
213		return 0;
214
215	dcdc->dvs_gpio_state = state;
216	gpiod_set_value(dcdc->dvs_gpiod, state);
217
218	/* Should wait for DVS state change to be asserted if we have
219	 * a GPIO for it, for now assume the device is configured
220	 * for the fastest possible transition.
221	 */
222
223	return 0;
224}
225
226static int wm831x_buckv_set_voltage_sel(struct regulator_dev *rdev,
227					unsigned vsel)
228{
229	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
230	struct wm831x *wm831x = dcdc->wm831x;
231	int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
232	int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL;
233	int ret;
234
235	/* If this value is already set then do a GPIO update if we can */
236	if (dcdc->dvs_gpiod && dcdc->on_vsel == vsel)
237		return wm831x_buckv_set_dvs(rdev, 0);
238
239	if (dcdc->dvs_gpiod && dcdc->dvs_vsel == vsel)
240		return wm831x_buckv_set_dvs(rdev, 1);
241
242	/* Always set the ON status to the minimum voltage */
243	ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel);
244	if (ret < 0)
245		return ret;
246	dcdc->on_vsel = vsel;
247
248	if (!dcdc->dvs_gpiod)
249		return ret;
250
251	/* Kick the voltage transition now */
252	ret = wm831x_buckv_set_dvs(rdev, 0);
253	if (ret < 0)
254		return ret;
255
256	/*
257	 * If this VSEL is higher than the last one we've seen then
258	 * remember it as the DVS VSEL.  This is optimised for CPUfreq
259	 * usage where we want to get to the highest voltage very
260	 * quickly.
261	 */
262	if (vsel > dcdc->dvs_vsel) {
263		ret = wm831x_set_bits(wm831x, dvs_reg,
264				      WM831X_DC1_DVS_VSEL_MASK,
265				      vsel);
266		if (ret == 0)
267			dcdc->dvs_vsel = vsel;
268		else
269			dev_warn(wm831x->dev,
270				 "Failed to set DCDC DVS VSEL: %d\n", ret);
271	}
272
273	return 0;
274}
275
276static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
277					    int uV)
278{
279	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
280	struct wm831x *wm831x = dcdc->wm831x;
281	u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
282	int vsel;
283
284	vsel = regulator_map_voltage_linear_range(rdev, uV, uV);
285	if (vsel < 0)
286		return vsel;
287
288	return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel);
289}
290
291static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev)
292{
293	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
294
295	if (dcdc->dvs_gpiod && dcdc->dvs_gpio_state)
296		return dcdc->dvs_vsel;
297	else
298		return dcdc->on_vsel;
299}
300
301/* Current limit options */
302static const unsigned int wm831x_dcdc_ilim[] = {
303	125000, 250000, 375000, 500000, 625000, 750000, 875000, 1000000
304};
305
306static const struct regulator_ops wm831x_buckv_ops = {
307	.set_voltage_sel = wm831x_buckv_set_voltage_sel,
308	.get_voltage_sel = wm831x_buckv_get_voltage_sel,
309	.list_voltage = regulator_list_voltage_linear_range,
310	.map_voltage = regulator_map_voltage_linear_range,
311	.set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
312	.set_current_limit = regulator_set_current_limit_regmap,
313	.get_current_limit = regulator_get_current_limit_regmap,
314
315	.is_enabled = regulator_is_enabled_regmap,
316	.enable = regulator_enable_regmap,
317	.disable = regulator_disable_regmap,
318	.get_status = wm831x_dcdc_get_status,
319	.get_mode = wm831x_dcdc_get_mode,
320	.set_mode = wm831x_dcdc_set_mode,
321	.set_suspend_mode = wm831x_dcdc_set_suspend_mode,
322};
323
324/*
325 * Set up DVS control.  We just log errors since we can still run
326 * (with reduced performance) if we fail.
327 */
328static void wm831x_buckv_dvs_init(struct platform_device *pdev,
329				  struct wm831x_dcdc *dcdc,
330				  struct wm831x_buckv_pdata *pdata)
331{
332	struct wm831x *wm831x = dcdc->wm831x;
333	int ret;
334	u16 ctrl;
335
336	if (!pdata)
337		return;
338
339	/* gpiolib won't let us read the GPIO status so pick the higher
340	 * of the two existing voltages so we take it as platform data.
341	 */
342	dcdc->dvs_gpio_state = pdata->dvs_init_state;
343
344	dcdc->dvs_gpiod = devm_gpiod_get(&pdev->dev, "dvs",
345			dcdc->dvs_gpio_state ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW);
346	if (IS_ERR(dcdc->dvs_gpiod)) {
347		dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %ld\n",
348			dcdc->name, PTR_ERR(dcdc->dvs_gpiod));
349		return;
350	}
351
352	switch (pdata->dvs_control_src) {
353	case 1:
354		ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;
355		break;
356	case 2:
357		ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT;
358		break;
359	default:
360		dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n",
361			pdata->dvs_control_src, dcdc->name);
362		return;
363	}
364
365	/* If DVS_VSEL is set to the minimum value then raise it to ON_VSEL
366	 * to make bootstrapping a bit smoother.
367	 */
368	if (!dcdc->dvs_vsel) {
369		ret = wm831x_set_bits(wm831x,
370				      dcdc->base + WM831X_DCDC_DVS_CONTROL,
371				      WM831X_DC1_DVS_VSEL_MASK, dcdc->on_vsel);
372		if (ret == 0)
373			dcdc->dvs_vsel = dcdc->on_vsel;
374		else
375			dev_warn(wm831x->dev, "Failed to set DVS_VSEL: %d\n",
376				 ret);
377	}
378
379	ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
380			      WM831X_DC1_DVS_SRC_MASK, ctrl);
381	if (ret < 0) {
382		dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
383			dcdc->name, ret);
384	}
385}
386
387static int wm831x_buckv_probe(struct platform_device *pdev)
388{
389	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
390	struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
391	struct regulator_config config = { };
392	int id;
393	struct wm831x_dcdc *dcdc;
394	struct resource *res;
395	int ret, irq;
396
397	if (pdata && pdata->wm831x_num)
398		id = (pdata->wm831x_num * 10) + 1;
399	else
400		id = 0;
401	id = pdev->id - id;
402
403	dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
404
405	dcdc = devm_kzalloc(&pdev->dev,  sizeof(struct wm831x_dcdc),
406			    GFP_KERNEL);
407	if (!dcdc)
408		return -ENOMEM;
409
410	dcdc->wm831x = wm831x;
411
412	res = platform_get_resource(pdev, IORESOURCE_REG, 0);
413	if (res == NULL) {
414		dev_err(&pdev->dev, "No REG resource\n");
415		ret = -EINVAL;
416		goto err;
417	}
418	dcdc->base = res->start;
419
420	snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
421	dcdc->desc.name = dcdc->name;
422
423	snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
424		 "DC%dVDD", id + 1);
425	dcdc->desc.supply_name = dcdc->supply_name;
426
427	dcdc->desc.id = id;
428	dcdc->desc.type = REGULATOR_VOLTAGE;
429	dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
430	dcdc->desc.linear_ranges = wm831x_buckv_ranges;
431	dcdc->desc.n_linear_ranges = ARRAY_SIZE(wm831x_buckv_ranges);
432	dcdc->desc.ops = &wm831x_buckv_ops;
433	dcdc->desc.owner = THIS_MODULE;
434	dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
435	dcdc->desc.enable_mask = 1 << id;
436	dcdc->desc.csel_reg = dcdc->base + WM831X_DCDC_CONTROL_2;
437	dcdc->desc.csel_mask = WM831X_DC1_HC_THR_MASK;
438	dcdc->desc.n_current_limits = ARRAY_SIZE(wm831x_dcdc_ilim);
439	dcdc->desc.curr_table = wm831x_dcdc_ilim;
440
441	ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
442	if (ret < 0) {
443		dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
444		goto err;
445	}
446	dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
447
448	ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL);
449	if (ret < 0) {
450		dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
451		goto err;
452	}
453	dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
454
455	if (pdata && pdata->dcdc[id])
456		wm831x_buckv_dvs_init(pdev, dcdc,
457				      pdata->dcdc[id]->driver_data);
458
459	config.dev = pdev->dev.parent;
460	if (pdata)
461		config.init_data = pdata->dcdc[id];
462	config.driver_data = dcdc;
463	config.regmap = wm831x->regmap;
464
465	dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
466						  &config);
467	if (IS_ERR(dcdc->regulator)) {
468		ret = PTR_ERR(dcdc->regulator);
469		dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
470			id + 1, ret);
471		goto err;
472	}
473
474	irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
475	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
476					wm831x_dcdc_uv_irq,
477					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
478					dcdc->name, dcdc);
479	if (ret != 0) {
480		dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
481			irq, ret);
482		goto err;
483	}
484
485	irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC"));
486	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
487					wm831x_dcdc_oc_irq,
488					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
489					dcdc->name, dcdc);
490	if (ret != 0) {
491		dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
492			irq, ret);
493		goto err;
494	}
495
496	platform_set_drvdata(pdev, dcdc);
497
498	return 0;
499
500err:
501	return ret;
502}
503
504static struct platform_driver wm831x_buckv_driver = {
505	.probe = wm831x_buckv_probe,
506	.driver		= {
507		.name	= "wm831x-buckv",
 
508	},
509};
510
511/*
512 * BUCKP specifics
513 */
514
515static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev, int uV)
516{
517	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
518	struct wm831x *wm831x = dcdc->wm831x;
519	u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
520	int sel;
521
522	sel = regulator_map_voltage_linear(rdev, uV, uV);
523	if (sel < 0)
524		return sel;
525
526	return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, sel);
527}
528
529static const struct regulator_ops wm831x_buckp_ops = {
530	.set_voltage_sel = regulator_set_voltage_sel_regmap,
531	.get_voltage_sel = regulator_get_voltage_sel_regmap,
532	.list_voltage = regulator_list_voltage_linear,
533	.map_voltage = regulator_map_voltage_linear,
534	.set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
535
536	.is_enabled = regulator_is_enabled_regmap,
537	.enable = regulator_enable_regmap,
538	.disable = regulator_disable_regmap,
539	.get_status = wm831x_dcdc_get_status,
540	.get_mode = wm831x_dcdc_get_mode,
541	.set_mode = wm831x_dcdc_set_mode,
542	.set_suspend_mode = wm831x_dcdc_set_suspend_mode,
543};
544
545static int wm831x_buckp_probe(struct platform_device *pdev)
546{
547	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
548	struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
549	struct regulator_config config = { };
550	int id;
551	struct wm831x_dcdc *dcdc;
552	struct resource *res;
553	int ret, irq;
554
555	if (pdata && pdata->wm831x_num)
556		id = (pdata->wm831x_num * 10) + 1;
557	else
558		id = 0;
559	id = pdev->id - id;
560
561	dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
562
563	dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc),
564			    GFP_KERNEL);
565	if (!dcdc)
566		return -ENOMEM;
567
568	dcdc->wm831x = wm831x;
569
570	res = platform_get_resource(pdev, IORESOURCE_REG, 0);
571	if (res == NULL) {
572		dev_err(&pdev->dev, "No REG resource\n");
573		ret = -EINVAL;
574		goto err;
575	}
576	dcdc->base = res->start;
577
578	snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
579	dcdc->desc.name = dcdc->name;
580
581	snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
582		 "DC%dVDD", id + 1);
583	dcdc->desc.supply_name = dcdc->supply_name;
584
585	dcdc->desc.id = id;
586	dcdc->desc.type = REGULATOR_VOLTAGE;
587	dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
588	dcdc->desc.ops = &wm831x_buckp_ops;
589	dcdc->desc.owner = THIS_MODULE;
590	dcdc->desc.vsel_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
591	dcdc->desc.vsel_mask = WM831X_DC3_ON_VSEL_MASK;
592	dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
593	dcdc->desc.enable_mask = 1 << id;
594	dcdc->desc.min_uV = 850000;
595	dcdc->desc.uV_step = 25000;
596
597	config.dev = pdev->dev.parent;
598	if (pdata)
599		config.init_data = pdata->dcdc[id];
600	config.driver_data = dcdc;
601	config.regmap = wm831x->regmap;
602
603	dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
604						  &config);
605	if (IS_ERR(dcdc->regulator)) {
606		ret = PTR_ERR(dcdc->regulator);
607		dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
608			id + 1, ret);
609		goto err;
610	}
611
612	irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
613	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
614					wm831x_dcdc_uv_irq,
615					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
616					dcdc->name, dcdc);
617	if (ret != 0) {
618		dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
619			irq, ret);
620		goto err;
621	}
622
623	platform_set_drvdata(pdev, dcdc);
624
625	return 0;
626
627err:
628	return ret;
629}
630
631static struct platform_driver wm831x_buckp_driver = {
632	.probe = wm831x_buckp_probe,
633	.driver		= {
634		.name	= "wm831x-buckp",
 
635	},
636};
637
638/*
639 * DCDC boost convertors
640 */
641
642static int wm831x_boostp_get_status(struct regulator_dev *rdev)
643{
644	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
645	struct wm831x *wm831x = dcdc->wm831x;
646	int ret;
647
648	/* First, check for errors */
649	ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
650	if (ret < 0)
651		return ret;
652
653	if (ret & (1 << rdev_get_id(rdev))) {
654		dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
655			rdev_get_id(rdev) + 1);
656		return REGULATOR_STATUS_ERROR;
657	}
658
659	/* Is the regulator on? */
660	ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
661	if (ret < 0)
662		return ret;
663	if (ret & (1 << rdev_get_id(rdev)))
664		return REGULATOR_STATUS_ON;
665	else
666		return REGULATOR_STATUS_OFF;
667}
668
669static const struct regulator_ops wm831x_boostp_ops = {
670	.get_status = wm831x_boostp_get_status,
671
672	.is_enabled = regulator_is_enabled_regmap,
673	.enable = regulator_enable_regmap,
674	.disable = regulator_disable_regmap,
675};
676
677static int wm831x_boostp_probe(struct platform_device *pdev)
678{
679	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
680	struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
681	struct regulator_config config = { };
682	int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
683	struct wm831x_dcdc *dcdc;
684	struct resource *res;
685	int ret, irq;
686
687	dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
688
689	if (pdata == NULL || pdata->dcdc[id] == NULL)
690		return -ENODEV;
691
692	dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
693	if (!dcdc)
694		return -ENOMEM;
695
696	dcdc->wm831x = wm831x;
697
698	res = platform_get_resource(pdev, IORESOURCE_REG, 0);
699	if (res == NULL) {
700		dev_err(&pdev->dev, "No REG resource\n");
701		return -EINVAL;
702	}
703	dcdc->base = res->start;
704
705	snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
706	dcdc->desc.name = dcdc->name;
707	dcdc->desc.id = id;
708	dcdc->desc.type = REGULATOR_VOLTAGE;
709	dcdc->desc.ops = &wm831x_boostp_ops;
710	dcdc->desc.owner = THIS_MODULE;
711	dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
712	dcdc->desc.enable_mask = 1 << id;
713
714	config.dev = pdev->dev.parent;
715	if (pdata)
716		config.init_data = pdata->dcdc[id];
717	config.driver_data = dcdc;
718	config.regmap = wm831x->regmap;
719
720	dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
721						  &config);
722	if (IS_ERR(dcdc->regulator)) {
723		ret = PTR_ERR(dcdc->regulator);
724		dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
725			id + 1, ret);
726		return ret;
727	}
728
729	irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
730	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
731					wm831x_dcdc_uv_irq,
732					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
733					dcdc->name,
734					dcdc);
735	if (ret != 0) {
736		dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
737			irq, ret);
738		return ret;
739	}
740
741	platform_set_drvdata(pdev, dcdc);
742
743	return 0;
744}
745
746static struct platform_driver wm831x_boostp_driver = {
747	.probe = wm831x_boostp_probe,
748	.driver		= {
749		.name	= "wm831x-boostp",
 
750	},
751};
752
753/*
754 * External Power Enable
755 *
756 * These aren't actually DCDCs but look like them in hardware so share
757 * code.
758 */
759
760#define WM831X_EPE_BASE 6
761
762static const struct regulator_ops wm831x_epe_ops = {
763	.is_enabled = regulator_is_enabled_regmap,
764	.enable = regulator_enable_regmap,
765	.disable = regulator_disable_regmap,
766	.get_status = wm831x_dcdc_get_status,
767};
768
769static int wm831x_epe_probe(struct platform_device *pdev)
770{
771	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
772	struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
773	struct regulator_config config = { };
774	int id = pdev->id % ARRAY_SIZE(pdata->epe);
775	struct wm831x_dcdc *dcdc;
776	int ret;
777
778	dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
779
780	dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
781	if (!dcdc)
782		return -ENOMEM;
783
784	dcdc->wm831x = wm831x;
785
786	/* For current parts this is correct; probably need to revisit
787	 * in future.
788	 */
789	snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
790	dcdc->desc.name = dcdc->name;
791	dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
792	dcdc->desc.ops = &wm831x_epe_ops;
793	dcdc->desc.type = REGULATOR_VOLTAGE;
794	dcdc->desc.owner = THIS_MODULE;
795	dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
796	dcdc->desc.enable_mask = 1 << dcdc->desc.id;
797
798	config.dev = pdev->dev.parent;
799	if (pdata)
800		config.init_data = pdata->epe[id];
801	config.driver_data = dcdc;
802	config.regmap = wm831x->regmap;
803
804	dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
805						  &config);
806	if (IS_ERR(dcdc->regulator)) {
807		ret = PTR_ERR(dcdc->regulator);
808		dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
809			id + 1, ret);
810		goto err;
811	}
812
813	platform_set_drvdata(pdev, dcdc);
814
815	return 0;
816
817err:
818	return ret;
819}
820
821static struct platform_driver wm831x_epe_driver = {
822	.probe = wm831x_epe_probe,
823	.driver		= {
824		.name	= "wm831x-epe",
 
825	},
826};
827
828static struct platform_driver * const drivers[] = {
829	&wm831x_buckv_driver,
830	&wm831x_buckp_driver,
831	&wm831x_boostp_driver,
832	&wm831x_epe_driver,
833};
834
835static int __init wm831x_dcdc_init(void)
836{
837	return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
838}
839subsys_initcall(wm831x_dcdc_init);
840
841static void __exit wm831x_dcdc_exit(void)
842{
843	platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
844}
845module_exit(wm831x_dcdc_exit);
846
847/* Module information */
848MODULE_AUTHOR("Mark Brown");
849MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
850MODULE_LICENSE("GPL");
851MODULE_ALIAS("platform:wm831x-buckv");
852MODULE_ALIAS("platform:wm831x-buckp");
853MODULE_ALIAS("platform:wm831x-boostp");
854MODULE_ALIAS("platform:wm831x-epe");