1 /*
2 * Regulator driver for DA9055 PMIC
3 *
4 * Copyright(c) 2012 Dialog Semiconductor Ltd.
5 *
6 * Author: David Dajun Chen <dchen@diasemi.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 */
14 
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/err.h>
18 #include <linux/gpio.h>
19 #include <linux/platform_device.h>
20 #include <linux/regulator/driver.h>
21 #include <linux/regulator/machine.h>
22 #include <linux/of.h>
23 #include <linux/regulator/of_regulator.h>
24 
25 #include <linux/mfd/da9055/core.h>
26 #include <linux/mfd/da9055/reg.h>
27 #include <linux/mfd/da9055/pdata.h>
28 
29 #define DA9055_MIN_UA		0
30 #define DA9055_MAX_UA		3
31 
32 #define DA9055_LDO_MODE_SYNC	0
33 #define DA9055_LDO_MODE_SLEEP	1
34 
35 #define DA9055_BUCK_MODE_SLEEP	1
36 #define DA9055_BUCK_MODE_SYNC	2
37 #define DA9055_BUCK_MODE_AUTO	3
38 
39 /* DA9055 REGULATOR IDs */
40 #define DA9055_ID_BUCK1	0
41 #define DA9055_ID_BUCK2	1
42 #define DA9055_ID_LDO1		2
43 #define DA9055_ID_LDO2		3
44 #define DA9055_ID_LDO3		4
45 #define DA9055_ID_LDO4		5
46 #define DA9055_ID_LDO5		6
47 #define DA9055_ID_LDO6		7
48 
49 /* DA9055 BUCK current limit */
50 static const int da9055_current_limits[] = { 500000, 600000, 700000, 800000 };
51 
52 struct da9055_conf_reg {
53 	int reg;
54 	int sel_mask;
55 	int en_mask;
56 };
57 
58 struct da9055_volt_reg {
59 	int reg_a;
60 	int reg_b;
61 	int sl_shift;
62 	int v_mask;
63 };
64 
65 struct da9055_mode_reg {
66 	int reg;
67 	int mask;
68 	int shift;
69 };
70 
71 struct da9055_regulator_info {
72 	struct regulator_desc reg_desc;
73 	struct da9055_conf_reg conf;
74 	struct da9055_volt_reg volt;
75 	struct da9055_mode_reg mode;
76 };
77 
78 struct da9055_regulator {
79 	struct da9055 *da9055;
80 	struct da9055_regulator_info *info;
81 	struct regulator_dev *rdev;
82 	enum gpio_select reg_rselect;
83 };
84 
85 static unsigned int da9055_buck_get_mode(struct regulator_dev *rdev)
86 {
87 	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
88 	struct da9055_regulator_info *info = regulator->info;
89 	int ret, mode = 0;
90 
91 	ret = da9055_reg_read(regulator->da9055, info->mode.reg);
92 	if (ret < 0)
93 		return ret;
94 
95 	switch ((ret & info->mode.mask) >> info->mode.shift) {
96 	case DA9055_BUCK_MODE_SYNC:
97 		mode = REGULATOR_MODE_FAST;
98 		break;
99 	case DA9055_BUCK_MODE_AUTO:
100 		mode = REGULATOR_MODE_NORMAL;
101 		break;
102 	case DA9055_BUCK_MODE_SLEEP:
103 		mode = REGULATOR_MODE_STANDBY;
104 		break;
105 	}
106 
107 	return mode;
108 }
109 
110 static int da9055_buck_set_mode(struct regulator_dev *rdev,
111 					unsigned int mode)
112 {
113 	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
114 	struct da9055_regulator_info *info = regulator->info;
115 	int val = 0;
116 
117 	switch (mode) {
118 	case REGULATOR_MODE_FAST:
119 		val = DA9055_BUCK_MODE_SYNC << info->mode.shift;
120 		break;
121 	case REGULATOR_MODE_NORMAL:
122 		val = DA9055_BUCK_MODE_AUTO << info->mode.shift;
123 		break;
124 	case REGULATOR_MODE_STANDBY:
125 		val = DA9055_BUCK_MODE_SLEEP << info->mode.shift;
126 		break;
127 	}
128 
129 	return da9055_reg_update(regulator->da9055, info->mode.reg,
130 				 info->mode.mask, val);
131 }
132 
133 static unsigned int da9055_ldo_get_mode(struct regulator_dev *rdev)
134 {
135 	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
136 	struct da9055_regulator_info *info = regulator->info;
137 	int ret;
138 
139 	ret = da9055_reg_read(regulator->da9055, info->volt.reg_b);
140 	if (ret < 0)
141 		return ret;
142 
143 	if (ret >> info->volt.sl_shift)
144 		return REGULATOR_MODE_STANDBY;
145 	else
146 		return REGULATOR_MODE_NORMAL;
147 }
148 
149 static int da9055_ldo_set_mode(struct regulator_dev *rdev, unsigned int mode)
150 {
151 	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
152 	struct da9055_regulator_info *info = regulator->info;
153 	struct da9055_volt_reg volt = info->volt;
154 	int val = 0;
155 
156 	switch (mode) {
157 	case REGULATOR_MODE_NORMAL:
158 	case REGULATOR_MODE_FAST:
159 		val = DA9055_LDO_MODE_SYNC;
160 		break;
161 	case REGULATOR_MODE_STANDBY:
162 		val = DA9055_LDO_MODE_SLEEP;
163 		break;
164 	}
165 
166 	return da9055_reg_update(regulator->da9055, volt.reg_b,
167 				 1 << volt.sl_shift,
168 				 val << volt.sl_shift);
169 }
170 
171 static int da9055_buck_get_current_limit(struct regulator_dev *rdev)
172 {
173 	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
174 	struct da9055_regulator_info *info = regulator->info;
175 	int ret;
176 
177 	ret = da9055_reg_read(regulator->da9055, DA9055_REG_BUCK_LIM);
178 	if (ret < 0)
179 		return ret;
180 
181 	ret &= info->mode.mask;
182 	return da9055_current_limits[ret >> info->mode.shift];
183 }
184 
185 static int da9055_buck_set_current_limit(struct regulator_dev *rdev, int min_uA,
186 					 int max_uA)
187 {
188 	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
189 	struct da9055_regulator_info *info = regulator->info;
190 	int i;
191 
192 	for (i = ARRAY_SIZE(da9055_current_limits) - 1; i >= 0; i--) {
193 		if ((min_uA <= da9055_current_limits[i]) &&
194 		    (da9055_current_limits[i] <= max_uA))
195 			return da9055_reg_update(regulator->da9055,
196 						 DA9055_REG_BUCK_LIM,
197 						 info->mode.mask,
198 						 i << info->mode.shift);
199 	}
200 
201 	return -EINVAL;
202 }
203 
204 static int da9055_regulator_get_voltage_sel(struct regulator_dev *rdev)
205 {
206 	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
207 	struct da9055_regulator_info *info = regulator->info;
208 	struct da9055_volt_reg volt = info->volt;
209 	int ret, sel;
210 
211 	/*
212 	 * There are two voltage register set A & B for voltage ramping but
213 	 * either one of then can be active therefore we first determine
214 	 * the active register set.
215 	 */
216 	ret = da9055_reg_read(regulator->da9055, info->conf.reg);
217 	if (ret < 0)
218 		return ret;
219 
220 	ret &= info->conf.sel_mask;
221 
222 	/* Get the voltage for the active register set A/B */
223 	if (ret == DA9055_REGUALTOR_SET_A)
224 		ret = da9055_reg_read(regulator->da9055, volt.reg_a);
225 	else
226 		ret = da9055_reg_read(regulator->da9055, volt.reg_b);
227 
228 	if (ret < 0)
229 		return ret;
230 
231 	sel = (ret & volt.v_mask);
232 	return sel;
233 }
234 
235 static int da9055_regulator_set_voltage_sel(struct regulator_dev *rdev,
236 					    unsigned int selector)
237 {
238 	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
239 	struct da9055_regulator_info *info = regulator->info;
240 	int ret;
241 
242 	/*
243 	 * Regulator register set A/B is not selected through GPIO therefore
244 	 * we use default register set A for voltage ramping.
245 	 */
246 	if (regulator->reg_rselect == NO_GPIO) {
247 		/* Select register set A */
248 		ret = da9055_reg_update(regulator->da9055, info->conf.reg,
249 					info->conf.sel_mask, DA9055_SEL_REG_A);
250 		if (ret < 0)
251 			return ret;
252 
253 		/* Set the voltage */
254 		return da9055_reg_update(regulator->da9055, info->volt.reg_a,
255 					 info->volt.v_mask, selector);
256 	}
257 
258 	/*
259 	 * Here regulator register set A/B is selected through GPIO.
260 	 * Therefore we first determine the selected register set A/B and
261 	 * then set the desired voltage for that register set A/B.
262 	 */
263 	ret = da9055_reg_read(regulator->da9055, info->conf.reg);
264 	if (ret < 0)
265 		return ret;
266 
267 	ret &= info->conf.sel_mask;
268 
269 	/* Set the voltage */
270 	if (ret == DA9055_REGUALTOR_SET_A)
271 		return da9055_reg_update(regulator->da9055, info->volt.reg_a,
272 					 info->volt.v_mask, selector);
273 	else
274 		return da9055_reg_update(regulator->da9055, info->volt.reg_b,
275 					 info->volt.v_mask, selector);
276 }
277 
278 static int da9055_regulator_set_suspend_voltage(struct regulator_dev *rdev,
279 						int uV)
280 {
281 	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
282 	struct da9055_regulator_info *info = regulator->info;
283 	int ret;
284 
285 	/* Select register set B for suspend voltage ramping. */
286 	if (regulator->reg_rselect == NO_GPIO) {
287 		ret = da9055_reg_update(regulator->da9055, info->conf.reg,
288 					info->conf.sel_mask, DA9055_SEL_REG_B);
289 		if (ret < 0)
290 			return ret;
291 	}
292 
293 	ret = regulator_map_voltage_linear(rdev, uV, uV);
294 	if (ret < 0)
295 		return ret;
296 
297 	return da9055_reg_update(regulator->da9055, info->volt.reg_b,
298 				 info->volt.v_mask, ret);
299 }
300 
301 static int da9055_suspend_enable(struct regulator_dev *rdev)
302 {
303 	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
304 	struct da9055_regulator_info *info = regulator->info;
305 
306 	/* Select register set B for voltage ramping. */
307 	if (regulator->reg_rselect == NO_GPIO)
308 		return da9055_reg_update(regulator->da9055, info->conf.reg,
309 					info->conf.sel_mask, DA9055_SEL_REG_B);
310 	else
311 		return 0;
312 }
313 
314 static int da9055_suspend_disable(struct regulator_dev *rdev)
315 {
316 	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
317 	struct da9055_regulator_info *info = regulator->info;
318 
319 	/* Diselect register set B. */
320 	if (regulator->reg_rselect == NO_GPIO)
321 		return da9055_reg_update(regulator->da9055, info->conf.reg,
322 					info->conf.sel_mask, DA9055_SEL_REG_A);
323 	else
324 		return 0;
325 }
326 
327 static struct regulator_ops da9055_buck_ops = {
328 	.get_mode = da9055_buck_get_mode,
329 	.set_mode = da9055_buck_set_mode,
330 
331 	.get_current_limit = da9055_buck_get_current_limit,
332 	.set_current_limit = da9055_buck_set_current_limit,
333 
334 	.get_voltage_sel = da9055_regulator_get_voltage_sel,
335 	.set_voltage_sel = da9055_regulator_set_voltage_sel,
336 	.list_voltage = regulator_list_voltage_linear,
337 	.map_voltage = regulator_map_voltage_linear,
338 	.is_enabled = regulator_is_enabled_regmap,
339 	.enable = regulator_enable_regmap,
340 	.disable = regulator_disable_regmap,
341 
342 	.set_suspend_voltage = da9055_regulator_set_suspend_voltage,
343 	.set_suspend_enable = da9055_suspend_enable,
344 	.set_suspend_disable = da9055_suspend_disable,
345 	.set_suspend_mode = da9055_buck_set_mode,
346 };
347 
348 static struct regulator_ops da9055_ldo_ops = {
349 	.get_mode = da9055_ldo_get_mode,
350 	.set_mode = da9055_ldo_set_mode,
351 
352 	.get_voltage_sel = da9055_regulator_get_voltage_sel,
353 	.set_voltage_sel = da9055_regulator_set_voltage_sel,
354 	.list_voltage = regulator_list_voltage_linear,
355 	.map_voltage = regulator_map_voltage_linear,
356 	.is_enabled = regulator_is_enabled_regmap,
357 	.enable = regulator_enable_regmap,
358 	.disable = regulator_disable_regmap,
359 
360 	.set_suspend_voltage = da9055_regulator_set_suspend_voltage,
361 	.set_suspend_enable = da9055_suspend_enable,
362 	.set_suspend_disable = da9055_suspend_disable,
363 	.set_suspend_mode = da9055_ldo_set_mode,
364 
365 };
366 
367 #define DA9055_LDO(_id, step, min, max, vbits, voffset) \
368 {\
369 	.reg_desc = {\
370 		.name = #_id,\
371 		.ops = &da9055_ldo_ops,\
372 		.type = REGULATOR_VOLTAGE,\
373 		.id = DA9055_ID_##_id,\
374 		.n_voltages = (max - min) / step + 1 + (voffset), \
375 		.enable_reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
376 		.enable_mask = 1, \
377 		.min_uV = (min) * 1000,\
378 		.uV_step = (step) * 1000,\
379 		.linear_min_sel = (voffset),\
380 		.owner = THIS_MODULE,\
381 	},\
382 	.conf = {\
383 		.reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
384 		.sel_mask = (1 << 4),\
385 		.en_mask = 1,\
386 	},\
387 	.volt = {\
388 		.reg_a = DA9055_REG_VBCORE_A + DA9055_ID_##_id, \
389 		.reg_b = DA9055_REG_VBCORE_B + DA9055_ID_##_id, \
390 		.sl_shift = 7,\
391 		.v_mask = (1 << (vbits)) - 1,\
392 	},\
393 }
394 
395 #define DA9055_BUCK(_id, step, min, max, vbits, voffset, mbits, sbits) \
396 {\
397 	.reg_desc = {\
398 		.name = #_id,\
399 		.ops = &da9055_buck_ops,\
400 		.type = REGULATOR_VOLTAGE,\
401 		.id = DA9055_ID_##_id,\
402 		.n_voltages = (max - min) / step + 1 + (voffset), \
403 		.enable_reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
404 		.enable_mask = 1,\
405 		.min_uV = (min) * 1000,\
406 		.uV_step = (step) * 1000,\
407 		.linear_min_sel = (voffset),\
408 		.owner = THIS_MODULE,\
409 	},\
410 	.conf = {\
411 		.reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
412 		.sel_mask = (1 << 4),\
413 		.en_mask = 1,\
414 	},\
415 	.volt = {\
416 		.reg_a = DA9055_REG_VBCORE_A + DA9055_ID_##_id, \
417 		.reg_b = DA9055_REG_VBCORE_B + DA9055_ID_##_id, \
418 		.sl_shift = 7,\
419 		.v_mask = (1 << (vbits)) - 1,\
420 	},\
421 	.mode = {\
422 		.reg = DA9055_REG_BCORE_MODE,\
423 		.mask = (mbits),\
424 		.shift = (sbits),\
425 	},\
426 }
427 
428 static struct da9055_regulator_info da9055_regulator_info[] = {
429 	DA9055_BUCK(BUCK1, 25, 725, 2075, 6, 9, 0xc, 2),
430 	DA9055_BUCK(BUCK2, 25, 925, 2500, 6, 0, 3, 0),
431 	DA9055_LDO(LDO1, 50, 900, 3300, 6, 2),
432 	DA9055_LDO(LDO2, 50, 900, 3300, 6, 3),
433 	DA9055_LDO(LDO3, 50, 900, 3300, 6, 2),
434 	DA9055_LDO(LDO4, 50, 900, 3300, 6, 2),
435 	DA9055_LDO(LDO5, 50, 900, 2750, 6, 2),
436 	DA9055_LDO(LDO6, 20, 900, 3300, 7, 0),
437 };
438 
439 /*
440  * Configures regulator to be controlled either through GPIO 1 or 2.
441  * GPIO can control regulator state and/or select the regulator register
442  * set A/B for voltage ramping.
443  */
444 static int da9055_gpio_init(struct da9055_regulator *regulator,
445 			    struct regulator_config *config,
446 			    struct da9055_pdata *pdata, int id)
447 {
448 	struct da9055_regulator_info *info = regulator->info;
449 	int ret = 0;
450 
451 	if (!pdata)
452 		return 0;
453 
454 	if (pdata->gpio_ren && pdata->gpio_ren[id]) {
455 		char name[18];
456 		int gpio_mux = pdata->gpio_ren[id];
457 
458 		config->ena_gpio = pdata->ena_gpio[id];
459 		config->ena_gpio_flags = GPIOF_OUT_INIT_HIGH;
460 		config->ena_gpio_invert = 1;
461 
462 		/*
463 		 * GPI pin is muxed with regulator to control the
464 		 * regulator state.
465 		 */
466 		sprintf(name, "DA9055 GPI %d", gpio_mux);
467 		ret = devm_gpio_request_one(config->dev, gpio_mux, GPIOF_DIR_IN,
468 					    name);
469 		if (ret < 0)
470 			goto err;
471 
472 		/*
473 		 * Let the regulator know that its state is controlled
474 		 * through GPI.
475 		 */
476 		ret = da9055_reg_update(regulator->da9055, info->conf.reg,
477 					DA9055_E_GPI_MASK,
478 					pdata->reg_ren[id]
479 					<< DA9055_E_GPI_SHIFT);
480 		if (ret < 0)
481 			goto err;
482 	}
483 
484 	if (pdata->gpio_rsel && pdata->gpio_rsel[id]) {
485 		char name[18];
486 		int gpio_mux = pdata->gpio_rsel[id];
487 
488 		regulator->reg_rselect = pdata->reg_rsel[id];
489 
490 		/*
491 		 * GPI pin is muxed with regulator to select the
492 		 * regulator register set A/B for voltage ramping.
493 		 */
494 		sprintf(name, "DA9055 GPI %d", gpio_mux);
495 		ret = devm_gpio_request_one(config->dev, gpio_mux, GPIOF_DIR_IN,
496 					    name);
497 		if (ret < 0)
498 			goto err;
499 
500 		/*
501 		 * Let the regulator know that its register set A/B
502 		 * will be selected through GPI for voltage ramping.
503 		 */
504 		ret = da9055_reg_update(regulator->da9055, info->conf.reg,
505 					DA9055_V_GPI_MASK,
506 					pdata->reg_rsel[id]
507 					<< DA9055_V_GPI_SHIFT);
508 	}
509 
510 err:
511 	return ret;
512 }
513 
514 static irqreturn_t da9055_ldo5_6_oc_irq(int irq, void *data)
515 {
516 	struct da9055_regulator *regulator = data;
517 
518 	regulator_notifier_call_chain(regulator->rdev,
519 				      REGULATOR_EVENT_OVER_CURRENT, NULL);
520 
521 	return IRQ_HANDLED;
522 }
523 
524 static inline struct da9055_regulator_info *find_regulator_info(int id)
525 {
526 	struct da9055_regulator_info *info;
527 	int i;
528 
529 	for (i = 0; i < ARRAY_SIZE(da9055_regulator_info); i++) {
530 		info = &da9055_regulator_info[i];
531 		if (info->reg_desc.id == id)
532 			return info;
533 	}
534 
535 	return NULL;
536 }
537 
538 #ifdef CONFIG_OF
539 static struct of_regulator_match da9055_reg_matches[] = {
540 	{ .name = "BUCK1", },
541 	{ .name = "BUCK2", },
542 	{ .name = "LDO1", },
543 	{ .name = "LDO2", },
544 	{ .name = "LDO3", },
545 	{ .name = "LDO4", },
546 	{ .name = "LDO5", },
547 	{ .name = "LDO6", },
548 };
549 
550 static int da9055_regulator_dt_init(struct platform_device *pdev,
551 				    struct da9055_regulator *regulator,
552 				    struct regulator_config *config,
553 				    int regid)
554 {
555 	struct device_node *nproot, *np;
556 	int ret;
557 
558 	nproot = of_node_get(pdev->dev.parent->of_node);
559 	if (!nproot)
560 		return -ENODEV;
561 
562 	np = of_get_child_by_name(nproot, "regulators");
563 	if (!np)
564 		return -ENODEV;
565 
566 	ret = of_regulator_match(&pdev->dev, np, &da9055_reg_matches[regid], 1);
567 	of_node_put(nproot);
568 	if (ret < 0) {
569 		dev_err(&pdev->dev, "Error matching regulator: %d\n", ret);
570 		return ret;
571 	}
572 
573 	config->init_data = da9055_reg_matches[regid].init_data;
574 	config->of_node = da9055_reg_matches[regid].of_node;
575 
576 	if (!config->of_node)
577 		return -ENODEV;
578 
579 	return 0;
580 }
581 #else
582 static inline int da9055_regulator_dt_init(struct platform_device *pdev,
583 				       struct da9055_regulator *regulator,
584 				       struct regulator_config *config,
585 				       int regid)
586 {
587 	return -ENODEV;
588 }
589 #endif /* CONFIG_OF */
590 
591 static int da9055_regulator_probe(struct platform_device *pdev)
592 {
593 	struct regulator_config config = { };
594 	struct da9055_regulator *regulator;
595 	struct da9055 *da9055 = dev_get_drvdata(pdev->dev.parent);
596 	struct da9055_pdata *pdata = dev_get_platdata(da9055->dev);
597 	int ret, irq;
598 
599 	regulator = devm_kzalloc(&pdev->dev, sizeof(struct da9055_regulator),
600 				 GFP_KERNEL);
601 	if (!regulator)
602 		return -ENOMEM;
603 
604 	regulator->info = find_regulator_info(pdev->id);
605 	if (regulator->info == NULL) {
606 		dev_err(&pdev->dev, "invalid regulator ID specified\n");
607 		return -EINVAL;
608 	}
609 
610 	regulator->da9055 = da9055;
611 	config.dev = &pdev->dev;
612 	config.driver_data = regulator;
613 	config.regmap = da9055->regmap;
614 
615 	if (pdata && pdata->regulators) {
616 		config.init_data = pdata->regulators[pdev->id];
617 	} else {
618 		ret = da9055_regulator_dt_init(pdev, regulator, &config,
619 					       pdev->id);
620 		if (ret < 0)
621 			return ret;
622 	}
623 
624 	ret = da9055_gpio_init(regulator, &config, pdata, pdev->id);
625 	if (ret < 0)
626 		return ret;
627 
628 	regulator->rdev = devm_regulator_register(&pdev->dev,
629 						  &regulator->info->reg_desc,
630 						  &config);
631 	if (IS_ERR(regulator->rdev)) {
632 		dev_err(&pdev->dev, "Failed to register regulator %s\n",
633 			regulator->info->reg_desc.name);
634 		return PTR_ERR(regulator->rdev);
635 	}
636 
637 	/* Only LDO 5 and 6 has got the over current interrupt */
638 	if (pdev->id == DA9055_ID_LDO5 || pdev->id ==  DA9055_ID_LDO6) {
639 		irq = platform_get_irq_byname(pdev, "REGULATOR");
640 		if (irq < 0)
641 			return irq;
642 
643 		ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
644 						da9055_ldo5_6_oc_irq,
645 						IRQF_TRIGGER_HIGH |
646 						IRQF_ONESHOT |
647 						IRQF_PROBE_SHARED,
648 						pdev->name, regulator);
649 		if (ret != 0) {
650 			if (ret != -EBUSY) {
651 				dev_err(&pdev->dev,
652 				"Failed to request Regulator IRQ %d: %d\n",
653 				irq, ret);
654 				return ret;
655 			}
656 		}
657 	}
658 
659 	platform_set_drvdata(pdev, regulator);
660 
661 	return 0;
662 }
663 
664 static struct platform_driver da9055_regulator_driver = {
665 	.probe = da9055_regulator_probe,
666 	.driver = {
667 		.name = "da9055-regulator",
668 	},
669 };
670 
671 static int __init da9055_regulator_init(void)
672 {
673 	return platform_driver_register(&da9055_regulator_driver);
674 }
675 subsys_initcall(da9055_regulator_init);
676 
677 static void __exit da9055_regulator_exit(void)
678 {
679 	platform_driver_unregister(&da9055_regulator_driver);
680 }
681 module_exit(da9055_regulator_exit);
682 
683 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
684 MODULE_DESCRIPTION("Power Regulator driver for Dialog DA9055 PMIC");
685 MODULE_LICENSE("GPL");
686 MODULE_ALIAS("platform:da9055-regulator");
687