summaryrefslogtreecommitdiff
path: root/drivers/platform/mellanox/mlxreg-hotplug.c
blob: ac97aa020db326dfc32ce821943ff37e2d77749c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
/*
 * Copyright (c) 2016-2018 Mellanox Technologies. All rights reserved.
 * Copyright (c) 2016-2018 Vadim Pasternak <vadimp@mellanox.com>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the names of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_data/mlxreg.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#include <linux/regmap.h>
#include <linux/workqueue.h>

/* Offset of event and mask registers from status register. */
#define MLXREG_HOTPLUG_EVENT_OFF	1
#define MLXREG_HOTPLUG_MASK_OFF		2
#define MLXREG_HOTPLUG_AGGR_MASK_OFF	1

/* ASIC health parameters. */
#define MLXREG_HOTPLUG_HEALTH_MASK	0x02
#define MLXREG_HOTPLUG_RST_CNTR		3

#define MLXREG_HOTPLUG_ATTRS_MAX	24
#define MLXREG_HOTPLUG_NOT_ASSERT	3

/**
 * struct mlxreg_hotplug_priv_data - platform private data:
 * @irq: platform device interrupt number;
 * @dev: basic device;
 * @pdev: platform device;
 * @plat: platform data;
 * @regmap: register map handle;
 * @dwork_irq: delayed work template;
 * @lock: spin lock;
 * @hwmon: hwmon device;
 * @mlxreg_hotplug_attr: sysfs attributes array;
 * @mlxreg_hotplug_dev_attr: sysfs sensor device attribute array;
 * @group: sysfs attribute group;
 * @groups: list of sysfs attribute group for hwmon registration;
 * @cell: location of top aggregation interrupt register;
 * @mask: top aggregation interrupt common mask;
 * @aggr_cache: last value of aggregation register status;
 * @after_probe: flag indication probing completion;
 * @not_asserted: number of entries in workqueue with no signal assertion;
 */
struct mlxreg_hotplug_priv_data {
	int irq;
	struct device *dev;
	struct platform_device *pdev;
	struct mlxreg_hotplug_platform_data *plat;
	struct regmap *regmap;
	struct delayed_work dwork_irq;
	spinlock_t lock; /* sync with interrupt */
	struct device *hwmon;
	struct attribute *mlxreg_hotplug_attr[MLXREG_HOTPLUG_ATTRS_MAX + 1];
	struct sensor_device_attribute_2
			mlxreg_hotplug_dev_attr[MLXREG_HOTPLUG_ATTRS_MAX];
	struct attribute_group group;
	const struct attribute_group *groups[2];
	u32 cell;
	u32 mask;
	u32 aggr_cache;
	bool after_probe;
	u8 not_asserted;
};

static int mlxreg_hotplug_device_create(struct mlxreg_hotplug_priv_data *priv,
					struct mlxreg_core_data *data)
{
	struct mlxreg_core_hotplug_platform_data *pdata;

	/*
	 * Return if adapter number is negative. It could be in case hotplug
	 * event is not associated with hotplug device.
	 */
	if (data->hpdev.nr < 0)
		return 0;

	pdata = dev_get_platdata(&priv->pdev->dev);
	data->hpdev.adapter = i2c_get_adapter(data->hpdev.nr +
					      pdata->shift_nr);
	if (!data->hpdev.adapter) {
		dev_err(priv->dev, "Failed to get adapter for bus %d\n",
			data->hpdev.nr + pdata->shift_nr);
		return -EFAULT;
	}

	data->hpdev.client = i2c_new_device(data->hpdev.adapter,
					    data->hpdev.brdinfo);
	if (!data->hpdev.client) {
		dev_err(priv->dev, "Failed to create client %s at bus %d at addr 0x%02x\n",
			data->hpdev.brdinfo->type, data->hpdev.nr +
			pdata->shift_nr, data->hpdev.brdinfo->addr);

		i2c_put_adapter(data->hpdev.adapter);
		data->hpdev.adapter = NULL;
		return -EFAULT;
	}

	return 0;
}

static void mlxreg_hotplug_device_destroy(struct mlxreg_core_data *data)
{
	if (data->hpdev.client) {
		i2c_unregister_device(data->hpdev.client);
		data->hpdev.client = NULL;
	}

	if (data->hpdev.adapter) {
		i2c_put_adapter(data->hpdev.adapter);
		data->hpdev.adapter = NULL;
	}
}

static ssize_t mlxreg_hotplug_attr_show(struct device *dev,
					struct device_attribute *attr,
					char *buf)
{
	struct mlxreg_hotplug_priv_data *priv = dev_get_drvdata(dev);
	struct mlxreg_core_hotplug_platform_data *pdata;
	int index = to_sensor_dev_attr_2(attr)->index;
	int nr = to_sensor_dev_attr_2(attr)->nr;
	struct mlxreg_core_item *item;
	struct mlxreg_core_data *data;
	u32 regval;
	int ret;

	pdata = dev_get_platdata(&priv->pdev->dev);
	item = pdata->items + nr;
	data = item->data + index;

	ret = regmap_read(priv->regmap, data->reg, &regval);
	if (ret)
		return ret;

	if (item->health) {
		regval &= data->mask;
	} else {
		/* Bit = 0 : functional if item->inversed is true. */
		if (item->inversed)
			regval = !(regval & data->mask);
		else
			regval = !!(regval & data->mask);
	}

	return sprintf(buf, "%u\n", regval);
}

#define PRIV_ATTR(i) priv->mlxreg_hotplug_attr[i]
#define PRIV_DEV_ATTR(i) priv->mlxreg_hotplug_dev_attr[i]

static int mlxreg_hotplug_attr_init(struct mlxreg_hotplug_priv_data *priv)
{
	struct mlxreg_core_hotplug_platform_data *pdata;
	struct mlxreg_core_item *item;
	struct mlxreg_core_data *data;
	int num_attrs = 0, id = 0, i, j;

	pdata = dev_get_platdata(&priv->pdev->dev);
	item = pdata->items;

	/* Go over all kinds of items - psu, pwr, fan. */
	for (i = 0; i < pdata->counter; i++, item++) {
		num_attrs += item->count;
		data = item->data;
		/* Go over all units within the item. */
		for (j = 0; j < item->count; j++, data++, id++) {
			PRIV_ATTR(id) = &PRIV_DEV_ATTR(id).dev_attr.attr;
			PRIV_ATTR(id)->name = devm_kasprintf(&priv->pdev->dev,
							     GFP_KERNEL,
							     data->label);

			if (!PRIV_ATTR(id)->name) {
				dev_err(priv->dev, "Memory allocation failed for attr %d.\n",
					id);
				return -ENOMEM;
			}

			PRIV_DEV_ATTR(id).dev_attr.attr.name =
							PRIV_ATTR(id)->name;
			PRIV_DEV_ATTR(id).dev_attr.attr.mode = 0444;
			PRIV_DEV_ATTR(id).dev_attr.show =
						mlxreg_hotplug_attr_show;
			PRIV_DEV_ATTR(id).nr = i;
			PRIV_DEV_ATTR(id).index = j;
			sysfs_attr_init(&PRIV_DEV_ATTR(id).dev_attr.attr);
		}
	}

	priv->group.attrs = devm_kcalloc(&priv->pdev->dev,
					 num_attrs,
					 sizeof(struct attribute *),
					 GFP_KERNEL);
	if (!priv->group.attrs)
		return -ENOMEM;

	priv->group.attrs = priv->mlxreg_hotplug_attr;
	priv->groups[0] = &priv->group;
	priv->groups[1] = NULL;

	return 0;
}

static void
mlxreg_hotplug_work_helper(struct mlxreg_hotplug_priv_data *priv,
			   struct mlxreg_core_item *item)
{
	struct mlxreg_core_data *data;
	u32 asserted, regval, bit;
	int ret;

	/*
	 * Validate if item related to received signal type is valid.
	 * It should never happen, excepted the situation when some
	 * piece of hardware is broken. In such situation just produce
	 * error message and return. Caller must continue to handle the
	 * signals from other devices if any.
	 */
	if (unlikely(!item)) {
		dev_err(priv->dev, "False signal: at offset:mask 0x%02x:0x%02x.\n",
			item->reg, item->mask);

		return;
	}

	/* Mask event. */
	ret = regmap_write(priv->regmap, item->reg + MLXREG_HOTPLUG_MASK_OFF,
			   0);
	if (ret)
		goto out;

	/* Read status. */
	ret = regmap_read(priv->regmap, item->reg, &regval);
	if (ret)
		goto out;

	/* Set asserted bits and save last status. */
	regval &= item->mask;
	asserted = item->cache ^ regval;
	item->cache = regval;

	for_each_set_bit(bit, (unsigned long *)&asserted, 8) {
		data = item->data + bit;
		if (regval & BIT(bit)) {
			if (item->inversed)
				mlxreg_hotplug_device_destroy(data);
			else
				mlxreg_hotplug_device_create(priv, data);
		} else {
			if (item->inversed)
				mlxreg_hotplug_device_create(priv, data);
			else
				mlxreg_hotplug_device_destroy(data);
		}
	}

	/* Acknowledge event. */
	ret = regmap_write(priv->regmap, item->reg + MLXREG_HOTPLUG_EVENT_OFF,
			   0);
	if (ret)
		goto out;

	/* Unmask event. */
	ret = regmap_write(priv->regmap, item->reg + MLXREG_HOTPLUG_MASK_OFF,
			   item->mask);

 out:
	if (ret)
		dev_err(priv->dev, "Failed to complete workqueue.\n");
}

static void
mlxreg_hotplug_health_work_helper(struct mlxreg_hotplug_priv_data *priv,
				  struct mlxreg_core_item *item)
{
	struct mlxreg_core_data *data = item->data;
	u32 regval;
	int i, ret = 0;

	for (i = 0; i < item->count; i++, data++) {
		/* Mask event. */
		ret = regmap_write(priv->regmap, data->reg +
				   MLXREG_HOTPLUG_MASK_OFF, 0);
		if (ret)
			goto out;

		/* Read status. */
		ret = regmap_read(priv->regmap, data->reg, &regval);
		if (ret)
			goto out;

		regval &= data->mask;
		item->cache = regval;
		if (regval == MLXREG_HOTPLUG_HEALTH_MASK) {
			if ((data->health_cntr++ == MLXREG_HOTPLUG_RST_CNTR) ||
			    !priv->after_probe) {
				mlxreg_hotplug_device_create(priv, data);
				data->attached = true;
			}
		} else {
			if (data->attached) {
				mlxreg_hotplug_device_destroy(data);
				data->attached = false;
				data->health_cntr = 0;
			}
		}

		/* Acknowledge event. */
		ret = regmap_write(priv->regmap, data->reg +
				   MLXREG_HOTPLUG_EVENT_OFF, 0);
		if (ret)
			goto out;

		/* Unmask event. */
		ret = regmap_write(priv->regmap, data->reg +
				   MLXREG_HOTPLUG_MASK_OFF, data->mask);
		if (ret)
			goto out;
	}

 out:
	if (ret)
		dev_err(priv->dev, "Failed to complete workqueue.\n");
}

/*
 * mlxreg_hotplug_work_handler - performs traversing of device interrupt
 * registers according to the below hierarchy schema:
 *
 *				Aggregation registers (status/mask)
 * PSU registers:		*---*
 * *-----------------*		|   |
 * |status/event/mask|----->    | * |
 * *-----------------*		|   |
 * Power registers:		|   |
 * *-----------------*		|   |
 * |status/event/mask|----->    | * |
 * *-----------------*		|   |
 * FAN registers:		|   |--> CPU
 * *-----------------*		|   |
 * |status/event/mask|----->    | * |
 * *-----------------*		|   |
 * ASIC registers:		|   |
 * *-----------------*		|   |
 * |status/event/mask|----->    | * |
 * *-----------------*		|   |
 *				*---*
 *
 * In case some system changed are detected: FAN in/out, PSU in/out, power
 * cable attached/detached, ASIC health good/bad, relevant device is created
 * or destroyed.
 */
static void mlxreg_hotplug_work_handler(struct work_struct *work)
{
	struct mlxreg_core_hotplug_platform_data *pdata;
	struct mlxreg_hotplug_priv_data *priv;
	struct mlxreg_core_item *item;
	u32 regval, aggr_asserted;
	unsigned long flags;
	int i, ret;

	priv = container_of(work, struct mlxreg_hotplug_priv_data,
			    dwork_irq.work);
	pdata = dev_get_platdata(&priv->pdev->dev);
	item = pdata->items;

	/* Mask aggregation event. */
	ret = regmap_write(priv->regmap, pdata->cell +
			   MLXREG_HOTPLUG_AGGR_MASK_OFF, 0);
	if (ret < 0)
		goto out;

	/* Read aggregation status. */
	ret = regmap_read(priv->regmap, pdata->cell, &regval);
	if (ret)
		goto out;

	regval &= pdata->mask;
	aggr_asserted = priv->aggr_cache ^ regval;
	priv->aggr_cache = regval;

	/*
	 * Handler is invoked, but no assertion is detected at top aggregation
	 * status level. Set aggr_asserted to mask value to allow handler extra
	 * run over all relevant signals to recover any missed signal.
	 */
	if (priv->not_asserted == MLXREG_HOTPLUG_NOT_ASSERT) {
		priv->not_asserted = 0;
		aggr_asserted = pdata->mask;
	}
	if (!aggr_asserted)
		goto unmask_event;

	/* Handle topology and health configuration changes. */
	for (i = 0; i < pdata->counter; i++, item++) {
		if (aggr_asserted & item->aggr_mask) {
			if (item->health)
				mlxreg_hotplug_health_work_helper(priv, item);
			else
				mlxreg_hotplug_work_helper(priv, item);
		}
	}

	spin_lock_irqsave(&priv->lock, flags);

	/*
	 * It is possible, that some signals have been inserted, while
	 * interrupt has been masked by mlxreg_hotplug_work_handler. In this
	 * case such signals will be missed. In order to handle these signals
	 * delayed work is canceled and work task re-scheduled for immediate
	 * execution. It allows to handle missed signals, if any. In other case
	 * work handler just validates that no new signals have been received
	 * during masking.
	 */
	cancel_delayed_work(&priv->dwork_irq);
	schedule_delayed_work(&priv->dwork_irq, 0);

	spin_unlock_irqrestore(&priv->lock, flags);

	return;

unmask_event:
	priv->not_asserted++;
	/* Unmask aggregation event (no need acknowledge). */
	ret = regmap_write(priv->regmap, pdata->cell +
			   MLXREG_HOTPLUG_AGGR_MASK_OFF, pdata->mask);

 out:
	if (ret)
		dev_err(priv->dev, "Failed to complete workqueue.\n");
}

static int mlxreg_hotplug_set_irq(struct mlxreg_hotplug_priv_data *priv)
{
	struct mlxreg_core_hotplug_platform_data *pdata;
	struct mlxreg_core_item *item;
	int i, ret;

	pdata = dev_get_platdata(&priv->pdev->dev);
	item = pdata->items;

	for (i = 0; i < pdata->counter; i++, item++) {
		/* Clear group presense event. */
		ret = regmap_write(priv->regmap, item->reg +
				   MLXREG_HOTPLUG_EVENT_OFF, 0);
		if (ret)
			goto out;

		/* Set group initial status as mask and unmask group event. */
		if (item->inversed) {
			item->cache = item->mask;
			ret = regmap_write(priv->regmap, item->reg +
					   MLXREG_HOTPLUG_MASK_OFF,
					   item->mask);
			if (ret)
				goto out;
		}
	}

	/* Keep aggregation initial status as zero and unmask events. */
	ret = regmap_write(priv->regmap, pdata->cell +
			   MLXREG_HOTPLUG_AGGR_MASK_OFF, pdata->mask);
	if (ret)
		goto out;

	/* Keep low aggregation initial status as zero and unmask events. */
	if (pdata->cell_low) {
		ret = regmap_write(priv->regmap, pdata->cell_low +
				   MLXREG_HOTPLUG_AGGR_MASK_OFF,
				   pdata->mask_low);
		if (ret)
			goto out;
	}

	/* Invoke work handler for initializing hot plug devices setting. */
	mlxreg_hotplug_work_handler(&priv->dwork_irq.work);

 out:
	if (ret)
		dev_err(priv->dev, "Failed to set interrupts.\n");
	enable_irq(priv->irq);
	return ret;
}

static void mlxreg_hotplug_unset_irq(struct mlxreg_hotplug_priv_data *priv)
{
	struct mlxreg_core_hotplug_platform_data *pdata;
	struct mlxreg_core_item *item;
	struct mlxreg_core_data *data;
	int count, i, j;

	pdata = dev_get_platdata(&priv->pdev->dev);
	item = pdata->items;
	disable_irq(priv->irq);
	cancel_delayed_work_sync(&priv->dwork_irq);

	/* Mask low aggregation event, if defined. */
	if (pdata->cell_low)
		regmap_write(priv->regmap, pdata->cell_low +
			     MLXREG_HOTPLUG_AGGR_MASK_OFF, 0);

	/* Mask aggregation event. */
	regmap_write(priv->regmap, pdata->cell + MLXREG_HOTPLUG_AGGR_MASK_OFF,
		     0);

	/* Clear topology configurations. */
	for (i = 0; i < pdata->counter; i++, item++) {
		data = item->data;
		/* Mask group presense event. */
		regmap_write(priv->regmap, data->reg + MLXREG_HOTPLUG_MASK_OFF,
			     0);
		/* Clear group presense event. */
		regmap_write(priv->regmap, data->reg +
			     MLXREG_HOTPLUG_EVENT_OFF, 0);

		/* Remove all the attached devices in group. */
		count = item->count;
		for (j = 0; j < count; j++, data++)
			mlxreg_hotplug_device_destroy(data);
	}
}

static irqreturn_t mlxreg_hotplug_irq_handler(int irq, void *dev)
{
	struct mlxreg_hotplug_priv_data *priv;

	priv = (struct mlxreg_hotplug_priv_data *)dev;

	/* Schedule work task for immediate execution.*/
	schedule_delayed_work(&priv->dwork_irq, 0);

	return IRQ_HANDLED;
}

static int mlxreg_hotplug_probe(struct platform_device *pdev)
{
	struct mlxreg_core_hotplug_platform_data *pdata;
	struct mlxreg_hotplug_priv_data *priv;
	struct i2c_adapter *deferred_adap;
	int err;

	pdata = dev_get_platdata(&pdev->dev);
	if (!pdata) {
		dev_err(&pdev->dev, "Failed to get platform data.\n");
		return -EINVAL;
	}

	/* Defer probing if the necessary adapter is not configured yet. */
	deferred_adap = i2c_get_adapter(pdata->deferred_nr);
	if (!deferred_adap)
		return -EPROBE_DEFER;
	i2c_put_adapter(deferred_adap);

	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	if (pdata->irq) {
		priv->irq = pdata->irq;
	} else {
		priv->irq = platform_get_irq(pdev, 0);
		if (priv->irq < 0) {
			dev_err(&pdev->dev, "Failed to get platform irq: %d\n",
				priv->irq);
			return priv->irq;
		}
	}

	priv->regmap = pdata->regmap;
	priv->dev = pdev->dev.parent;
	priv->pdev = pdev;

	err = devm_request_irq(&pdev->dev, priv->irq,
			       mlxreg_hotplug_irq_handler, IRQF_TRIGGER_FALLING
			       | IRQF_SHARED, "mlxreg-hotplug", priv);
	if (err) {
		dev_err(&pdev->dev, "Failed to request irq: %d\n", err);
		return err;
	}

	disable_irq(priv->irq);
	spin_lock_init(&priv->lock);
	INIT_DELAYED_WORK(&priv->dwork_irq, mlxreg_hotplug_work_handler);
	/* Perform initial interrupts setup. */
	mlxreg_hotplug_set_irq(priv);

	priv->after_probe = true;
	dev_set_drvdata(&pdev->dev, priv);

	err = mlxreg_hotplug_attr_init(priv);
	if (err) {
		dev_err(&pdev->dev, "Failed to allocate attributes: %d\n",
			err);
		return err;
	}

	priv->hwmon = devm_hwmon_device_register_with_groups(&pdev->dev,
					"mlxreg_hotplug", priv, priv->groups);
	if (IS_ERR(priv->hwmon)) {
		dev_err(&pdev->dev, "Failed to register hwmon device %ld\n",
			PTR_ERR(priv->hwmon));
		return PTR_ERR(priv->hwmon);
	}

	return 0;
}

static int mlxreg_hotplug_remove(struct platform_device *pdev)
{
	struct mlxreg_hotplug_priv_data *priv = dev_get_drvdata(&pdev->dev);

	/* Clean interrupts setup. */
	mlxreg_hotplug_unset_irq(priv);

	return 0;
}

static struct platform_driver mlxreg_hotplug_driver = {
	.driver = {
		.name = "mlxreg-hotplug",
	},
	.probe = mlxreg_hotplug_probe,
	.remove = mlxreg_hotplug_remove,
};

module_platform_driver(mlxreg_hotplug_driver);

MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
MODULE_DESCRIPTION("Mellanox regmap hotplug platform driver");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_ALIAS("platform:mlxreg-hotplug");