drivers/platform/mellanox/mlxreg-hotplug.c

   1 /*
   2  * Copyright (c) 2016-2018 Mellanox Technologies. All rights reserved.
   3  * Copyright (c) 2016-2018 Vadim Pasternak <vadimp@mellanox.com>
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are met:
   7  *
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the names of the copyright holders nor the names of its
  14  *    contributors may be used to endorse or promote products derived from
  15  *    this software without specific prior written permission.
  16  *
  17  * Alternatively, this software may be distributed under the terms of the
  18  * GNU General Public License ("GPL") version 2 as published by the Free
  19  * Software Foundation.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  22  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  25  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  26  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  27  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  28  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  29  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  30  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  31  * POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include <linux/bitops.h>
  35 #include <linux/device.h>
  36 #include <linux/hwmon.h>
  37 #include <linux/hwmon-sysfs.h>
  38 #include <linux/i2c.h>
  39 #include <linux/interrupt.h>
  40 #include <linux/module.h>
  41 #include <linux/of_device.h>
  42 #include <linux/platform_data/mlxreg.h>
  43 #include <linux/platform_device.h>
  44 #include <linux/spinlock.h>
  45 #include <linux/regmap.h>
  46 #include <linux/workqueue.h>
  47
  48 /* Offset of event and mask registers from status register. */
  49 #define MLXREG_HOTPLUG_EVENT_OFF        1
  50 #define MLXREG_HOTPLUG_MASK_OFF         2
  51 #define MLXREG_HOTPLUG_AGGR_MASK_OFF    1
  52
  53 /* ASIC health parameters. */
  54 #define MLXREG_HOTPLUG_HEALTH_MASK      0x02
  55 #define MLXREG_HOTPLUG_RST_CNTR         3
  56
  57 #define MLXREG_HOTPLUG_ATTRS_MAX        24
  58
  59 /**
  60  * struct mlxreg_hotplug_priv_data - platform private data:
  61  * @irq: platform device interrupt number;
  62  * @pdev: platform device;
  63  * @plat: platform data;
  64  * @dwork: delayed work template;
  65  * @lock: spin lock;
  66  * @hwmon: hwmon device;
  67  * @mlxreg_hotplug_attr: sysfs attributes array;
  68  * @mlxreg_hotplug_dev_attr: sysfs sensor device attribute array;
  69  * @group: sysfs attribute group;
  70  * @groups: list of sysfs attribute group for hwmon registration;
  71  * @cell: location of top aggregation interrupt register;
  72  * @mask: top aggregation interrupt common mask;
  73  * @aggr_cache: last value of aggregation register status;
  74  */
  75 struct mlxreg_hotplug_priv_data {
  76         int irq;
  77         struct device *dev;
  78         struct platform_device *pdev;
  79         struct mlxreg_hotplug_platform_data *plat;
  80         struct regmap *regmap;
  81         struct delayed_work dwork_irq;
  82         struct delayed_work dwork;
  83         spinlock_t lock; /* sync with interrupt */
  84         struct device *hwmon;
  85         struct attribute *mlxreg_hotplug_attr[MLXREG_HOTPLUG_ATTRS_MAX + 1];
  86         struct sensor_device_attribute_2
  87                         mlxreg_hotplug_dev_attr[MLXREG_HOTPLUG_ATTRS_MAX];
  88         struct attribute_group group;
  89         const struct attribute_group *groups[2];
  90         u32 cell;
  91         u32 mask;
  92         u32 aggr_cache;
  93         bool after_probe;
  94 };
  95
  96 static int mlxreg_hotplug_device_create(struct mlxreg_hotplug_priv_data *priv,
  97                                         struct mlxreg_core_data *data)
  98 {
  99         struct mlxreg_core_hotplug_platform_data *pdata;
 100
 101         /*
 102          * Return if adapter number is negative. It could be in case hotplug
 103          * event is not associated with hotplug device.
 104          */
 105         if (data->hpdev.nr < 0)
 106                 return 0;
 107
 108         pdata = dev_get_platdata(&priv->pdev->dev);
 109         data->hpdev.adapter = i2c_get_adapter(data->hpdev.nr +
 110                                               pdata->shift_nr);
 111         if (!data->hpdev.adapter) {
 112                 dev_err(priv->dev, "Failed to get adapter for bus %d\n",
 113                         data->hpdev.nr + pdata->shift_nr);
 114                 return -EFAULT;
 115         }
 116
 117         data->hpdev.client = i2c_new_device(data->hpdev.adapter,
 118                                             data->hpdev.brdinfo);
 119         if (!data->hpdev.client) {
 120                 dev_err(priv->dev, "Failed to create client %s at bus %d at addr 0x%02x\n",
 121                         data->hpdev.brdinfo->type, data->hpdev.nr +
 122                         pdata->shift_nr, data->hpdev.brdinfo->addr);
 123
 124                 i2c_put_adapter(data->hpdev.adapter);
 125                 data->hpdev.adapter = NULL;
 126                 return -EFAULT;
 127         }
 128
 129         return 0;
 130 }
 131
 132 static void mlxreg_hotplug_device_destroy(struct mlxreg_core_data *data)
 133 {
 134         if (data->hpdev.client) {
 135                 i2c_unregister_device(data->hpdev.client);
 136                 data->hpdev.client = NULL;
 137         }
 138
 139         if (data->hpdev.adapter) {
 140                 i2c_put_adapter(data->hpdev.adapter);
 141                 data->hpdev.adapter = NULL;
 142         }
 143 }
 144
 145 static ssize_t mlxreg_hotplug_attr_show(struct device *dev,
 146                                         struct device_attribute *attr,
 147                                         char *buf)
 148 {
 149         struct mlxreg_hotplug_priv_data *priv = dev_get_drvdata(dev);
 150         struct mlxreg_core_hotplug_platform_data *pdata;
 151         int index = to_sensor_dev_attr_2(attr)->index;
 152         int nr = to_sensor_dev_attr_2(attr)->nr;
 153         struct mlxreg_core_item *item;
 154         struct mlxreg_core_data *data;
 155         u32 regval;
 156         int ret;
 157
 158         pdata = dev_get_platdata(&priv->pdev->dev);
 159         item = pdata->items + nr;
 160         data = item->data + index;
 161
 162         ret = regmap_read(priv->regmap, data->reg, &regval);
 163         if (ret)
 164                 return ret;
 165
 166         if (item->health) {
 167                 regval &= data->mask;
 168         } else {
 169                 /* Bit = 0 : functional if item->inversed is true. */
 170                 if (item->inversed)
 171                         regval = !(regval & data->mask);
 172                 else
 173                         regval = !!(regval & data->mask);
 174         }
 175
 176         return sprintf(buf, "%u\n", regval);
 177 }
 178
 179 #define PRIV_ATTR(i) priv->mlxreg_hotplug_attr[i]
 180 #define PRIV_DEV_ATTR(i) priv->mlxreg_hotplug_dev_attr[i]
 181
 182 static int mlxreg_hotplug_attr_init(struct mlxreg_hotplug_priv_data *priv)
 183 {
 184         struct mlxreg_core_hotplug_platform_data *pdata;
 185         struct mlxreg_core_item *item;
 186         struct mlxreg_core_data *data;
 187         int num_attrs = 0, id = 0, i, j;
 188
 189         pdata = dev_get_platdata(&priv->pdev->dev);
 190         item = pdata->items;
 191
 192         /* Go over all kinds of items - psu, pwr, fan. */
 193         for (i = 0; i < pdata->counter; i++, item++) {
 194                 num_attrs += item->count;
 195                 data = item->data;
 196                 /* Go over all units within the item. */
 197                 for (j = 0; j < item->count; j++, data++, id++) {
 198                         PRIV_ATTR(id) = &PRIV_DEV_ATTR(id).dev_attr.attr;
 199                         PRIV_ATTR(id)->name = devm_kasprintf(&priv->pdev->dev,
 200                                                              GFP_KERNEL,
 201                                                              data->label);
 202
 203                         if (!PRIV_ATTR(id)->name) {
 204                                 dev_err(priv->dev, "Memory allocation failed for attr %d.\n",
 205                                         id);
 206                                 return -ENOMEM;
 207                         }
 208
 209                         PRIV_DEV_ATTR(id).dev_attr.attr.name =
 210                                                         PRIV_ATTR(id)->name;
 211                         PRIV_DEV_ATTR(id).dev_attr.attr.mode = 0444;
 212                         PRIV_DEV_ATTR(id).dev_attr.show =
 213                                                 mlxreg_hotplug_attr_show;
 214                         PRIV_DEV_ATTR(id).nr = i;
 215                         PRIV_DEV_ATTR(id).index = j;
 216                         sysfs_attr_init(&PRIV_DEV_ATTR(id).dev_attr.attr);
 217                 }
 218         }
 219
 220         priv->group.attrs = devm_kzalloc(&priv->pdev->dev, num_attrs *
 221                                          sizeof(struct attribute *),
 222                                          GFP_KERNEL);
 223         if (!priv->group.attrs)
 224                 return -ENOMEM;
 225
 226         priv->group.attrs = priv->mlxreg_hotplug_attr;
 227         priv->groups[0] = &priv->group;
 228         priv->groups[1] = NULL;
 229
 230         return 0;
 231 }
 232
 233 static void
 234 mlxreg_hotplug_work_helper(struct mlxreg_hotplug_priv_data *priv,
 235                            struct mlxreg_core_item *item)
 236 {
 237         struct mlxreg_core_data *data;
 238         u32 asserted, regval, bit;
 239         int ret;
 240
 241         /*
 242          * Validate if item related to received signal type is valid.
 243          * It should never happen, excepted the situation when some
 244          * piece of hardware is broken. In such situation just produce
 245          * error message and return. Caller must continue to handle the
 246          * signals from other devices if any.
 247          */
 248         if (unlikely(!item)) {
 249                 dev_err(priv->dev, "False signal: at offset:mask 0x%02x:0x%02x.\n",
 250                         item->reg, item->mask);
 251
 252                 return;
 253         }
 254
 255         /* Mask event. */
 256         ret = regmap_write(priv->regmap, item->reg + MLXREG_HOTPLUG_MASK_OFF,
 257                            0);
 258         if (ret)
 259                 goto out;
 260
 261         /* Read status. */
 262         ret = regmap_read(priv->regmap, item->reg, &regval);
 263         if (ret)
 264                 goto out;
 265
 266         /* Set asserted bits and save last status. */
 267         regval &= item->mask;
 268         asserted = item->cache ^ regval;
 269         item->cache = regval;
 270
 271         for_each_set_bit(bit, (unsigned long *)&asserted, 8) {
 272                 data = item->data + bit;
 273                 if (regval & BIT(bit)) {
 274                         if (item->inversed)
 275                                 mlxreg_hotplug_device_destroy(data);
 276                         else
 277                                 mlxreg_hotplug_device_create(priv, data);
 278                 } else {
 279                         if (item->inversed)
 280                                 mlxreg_hotplug_device_create(priv, data);
 281                         else
 282                                 mlxreg_hotplug_device_destroy(data);
 283                 }
 284         }
 285
 286         /* Acknowledge event. */
 287         ret = regmap_write(priv->regmap, item->reg + MLXREG_HOTPLUG_EVENT_OFF,
 288                            0);
 289         if (ret)
 290                 goto out;
 291
 292         /* Unmask event. */
 293         ret = regmap_write(priv->regmap, item->reg + MLXREG_HOTPLUG_MASK_OFF,
 294                            item->mask);
 295
 296  out:
 297         if (ret)
 298                 dev_err(priv->dev, "Failed to complete workqueue.\n");
 299 }
 300
 301 static void
 302 mlxreg_hotplug_health_work_helper(struct mlxreg_hotplug_priv_data *priv,
 303                                   struct mlxreg_core_item *item)
 304 {
 305         struct mlxreg_core_data *data = item->data;
 306         u32 regval;
 307         int i, ret = 0;
 308
 309         for (i = 0; i < item->count; i++, data++) {
 310                 /* Mask event. */
 311                 ret = regmap_write(priv->regmap, data->reg +
 312                                    MLXREG_HOTPLUG_MASK_OFF, 0);
 313                 if (ret)
 314                         goto out;
 315
 316                 /* Read status. */
 317                 ret = regmap_read(priv->regmap, data->reg, &regval);
 318                 if (ret)
 319                         goto out;
 320
 321                 regval &= data->mask;
 322                 item->cache = regval;
 323                 if (regval == MLXREG_HOTPLUG_HEALTH_MASK) {
 324                         if ((data->health_cntr++ == MLXREG_HOTPLUG_RST_CNTR) ||
 325                             !priv->after_probe) {
 326                                 mlxreg_hotplug_device_create(priv, data);
 327                                 data->attached = true;
 328                         }
 329                 } else {
 330                         if (data->attached) {
 331                                 mlxreg_hotplug_device_destroy(data);
 332                                 data->attached = false;
 333                                 data->health_cntr = 0;
 334                         }
 335                 }
 336
 337                 /* Acknowledge event. */
 338                 ret = regmap_write(priv->regmap, data->reg +
 339                                    MLXREG_HOTPLUG_EVENT_OFF, 0);
 340                 if (ret)
 341                         goto out;
 342
 343                 /* Unmask event. */
 344                 ret = regmap_write(priv->regmap, data->reg +
 345                                    MLXREG_HOTPLUG_MASK_OFF, data->mask);
 346                 if (ret)
 347                         goto out;
 348         }
 349
 350  out:
 351         if (ret)
 352                 dev_err(priv->dev, "Failed to complete workqueue.\n");
 353 }
 354
 355 /*
 356  * mlxreg_hotplug_work_handler - performs traversing of device interrupt
 357  * registers according to the below hierarchy schema:
 358  *
 359  *                              Aggregation registers (status/mask)
 360  * PSU registers:               *---*
 361  * *-----------------*          |   |
 362  * |status/event/mask|----->    | * |
 363  * *-----------------*          |   |
 364  * Power registers:             |   |
 365  * *-----------------*          |   |
 366  * |status/event/mask|----->    | * |
 367  * *-----------------*          |   |
 368  * FAN registers:               |   |--> CPU
 369  * *-----------------*          |   |
 370  * |status/event/mask|----->    | * |
 371  * *-----------------*          |   |
 372  * ASIC registers:              |   |
 373  * *-----------------*          |   |
 374  * |status/event/mask|----->    | * |
 375  * *-----------------*          |   |
 376  *                              *---*
 377  *
 378  * In case some system changed are detected: FAN in/out, PSU in/out, power
 379  * cable attached/detached, ASIC health good/bad, relevant device is created
 380  * or destroyed.
 381  */
 382 static void mlxreg_hotplug_work_handler(struct work_struct *work)
 383 {
 384         struct mlxreg_core_hotplug_platform_data *pdata;
 385         struct mlxreg_hotplug_priv_data *priv;
 386         struct mlxreg_core_item *item;
 387         u32 regval, aggr_asserted;
 388         unsigned long flags;
 389         int i, ret;
 390
 391         priv = container_of(work, struct mlxreg_hotplug_priv_data,
 392                             dwork_irq.work);
 393         pdata = dev_get_platdata(&priv->pdev->dev);
 394         item = pdata->items;
 395
 396         /* Mask aggregation event. */
 397         ret = regmap_write(priv->regmap, pdata->cell +
 398                            MLXREG_HOTPLUG_AGGR_MASK_OFF, 0);
 399         if (ret < 0)
 400                 goto out;
 401
 402         /* Read aggregation status. */
 403         ret = regmap_read(priv->regmap, pdata->cell, &regval);
 404         if (ret)
 405                 goto out;
 406
 407         regval &= pdata->mask;
 408         aggr_asserted = priv->aggr_cache ^ regval;
 409         priv->aggr_cache = regval;
 410
 411         /* Handle topology and health configuration changes. */
 412         for (i = 0; i < pdata->counter; i++, item++) {
 413                 if (aggr_asserted & item->aggr_mask) {
 414                         if (item->health)
 415                                 mlxreg_hotplug_health_work_helper(priv, item);
 416                         else
 417                                 mlxreg_hotplug_work_helper(priv, item);
 418                 }
 419         }
 420
 421         if (aggr_asserted) {
 422                 spin_lock_irqsave(&priv->lock, flags);
 423
 424                 /*
 425                  * It is possible, that some signals have been inserted, while
 426                  * interrupt has been masked by mlxreg_hotplug_work_handler.
 427                  * In this case such signals will be missed. In order to handle
 428                  * these signals delayed work is canceled and work task
 429                  * re-scheduled for immediate execution. It allows to handle
 430                  * missed signals, if any. In other case work handler just
 431                  * validates that no new signals have been received during
 432                  * masking.
 433                  */
 434                 cancel_delayed_work(&priv->dwork_irq);
 435                 schedule_delayed_work(&priv->dwork_irq, 0);
 436
 437                 spin_unlock_irqrestore(&priv->lock, flags);
 438
 439                 return;
 440         }
 441
 442         /* Unmask aggregation event (no need acknowledge). */
 443         ret = regmap_write(priv->regmap, pdata->cell +
 444                            MLXREG_HOTPLUG_AGGR_MASK_OFF, pdata->mask);
 445
 446  out:
 447         if (ret)
 448                 dev_err(priv->dev, "Failed to complete workqueue.\n");
 449 }
 450
 451 static int mlxreg_hotplug_set_irq(struct mlxreg_hotplug_priv_data *priv)
 452 {
 453         struct mlxreg_core_hotplug_platform_data *pdata;
 454         struct mlxreg_core_item *item;
 455         int i, ret;
 456
 457         pdata = dev_get_platdata(&priv->pdev->dev);
 458         item = pdata->items;
 459
 460         for (i = 0; i < pdata->counter; i++, item++) {
 461                 /* Clear group presense event. */
 462                 ret = regmap_write(priv->regmap, item->reg +
 463                                    MLXREG_HOTPLUG_EVENT_OFF, 0);
 464                 if (ret)
 465                         goto out;
 466
 467                 /* Set group initial status as mask and unmask group event. */
 468                 if (item->inversed) {
 469                         item->cache = item->mask;
 470                         ret = regmap_write(priv->regmap, item->reg +
 471                                            MLXREG_HOTPLUG_MASK_OFF,
 472                                            item->mask);
 473                         if (ret)
 474                                 goto out;
 475                 }
 476         }
 477
 478         /* Keep aggregation initial status as zero and unmask events. */
 479         ret = regmap_write(priv->regmap, pdata->cell +
 480                            MLXREG_HOTPLUG_AGGR_MASK_OFF, pdata->mask);
 481         if (ret)
 482                 goto out;
 483
 484         /* Keep low aggregation initial status as zero and unmask events. */
 485         if (pdata->cell_low) {
 486                 ret = regmap_write(priv->regmap, pdata->cell_low +
 487                                    MLXREG_HOTPLUG_AGGR_MASK_OFF,
 488                                    pdata->mask_low);
 489                 if (ret)
 490                         goto out;
 491         }
 492
 493         /* Invoke work handler for initializing hot plug devices setting. */
 494         mlxreg_hotplug_work_handler(&priv->dwork_irq.work);
 495
 496  out:
 497         if (ret)
 498                 dev_err(priv->dev, "Failed to set interrupts.\n");
 499         enable_irq(priv->irq);
 500         return ret;
 501 }
 502
 503 static void mlxreg_hotplug_unset_irq(struct mlxreg_hotplug_priv_data *priv)
 504 {
 505         struct mlxreg_core_hotplug_platform_data *pdata;
 506         struct mlxreg_core_item *item;
 507         struct mlxreg_core_data *data;
 508         int count, i, j;
 509
 510         pdata = dev_get_platdata(&priv->pdev->dev);
 511         item = pdata->items;
 512         disable_irq(priv->irq);
 513         cancel_delayed_work_sync(&priv->dwork_irq);
 514
 515         /* Mask low aggregation event, if defined. */
 516         if (pdata->cell_low)
 517                 regmap_write(priv->regmap, pdata->cell_low +
 518                              MLXREG_HOTPLUG_AGGR_MASK_OFF, 0);
 519
 520         /* Mask aggregation event. */
 521         regmap_write(priv->regmap, pdata->cell + MLXREG_HOTPLUG_AGGR_MASK_OFF,
 522                      0);
 523
 524         /* Clear topology configurations. */
 525         for (i = 0; i < pdata->counter; i++, item++) {
 526                 data = item->data;
 527                 /* Mask group presense event. */
 528                 regmap_write(priv->regmap, data->reg + MLXREG_HOTPLUG_MASK_OFF,
 529                              0);
 530                 /* Clear group presense event. */
 531                 regmap_write(priv->regmap, data->reg +
 532                              MLXREG_HOTPLUG_EVENT_OFF, 0);
 533
 534                 /* Remove all the attached devices in group. */
 535                 count = item->count;
 536                 for (j = 0; j < count; j++, data++)
 537                         mlxreg_hotplug_device_destroy(data);
 538         }
 539 }
 540
 541 static irqreturn_t mlxreg_hotplug_irq_handler(int irq, void *dev)
 542 {
 543         struct mlxreg_hotplug_priv_data *priv;
 544
 545         priv = (struct mlxreg_hotplug_priv_data *)dev;
 546
 547         /* Schedule work task for immediate execution.*/
 548         schedule_delayed_work(&priv->dwork_irq, 0);
 549
 550         return IRQ_HANDLED;
 551 }
 552
 553 static int mlxreg_hotplug_probe(struct platform_device *pdev)
 554 {
 555         struct mlxreg_core_hotplug_platform_data *pdata;
 556         struct mlxreg_hotplug_priv_data *priv;
 557         struct i2c_adapter *deferred_adap;
 558         int err;
 559
 560         pdata = dev_get_platdata(&pdev->dev);
 561         if (!pdata) {
 562                 dev_err(&pdev->dev, "Failed to get platform data.\n");
 563                 return -EINVAL;
 564         }
 565
 566         /* Defer probing if the necessary adapter is not configured yet. */
 567         deferred_adap = i2c_get_adapter(pdata->deferred_nr);
 568         if (!deferred_adap)
 569                 return -EPROBE_DEFER;
 570         i2c_put_adapter(deferred_adap);
 571
 572         priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
 573         if (!priv)
 574                 return -ENOMEM;
 575
 576         if (pdata->irq) {
 577                 priv->irq = pdata->irq;
 578         } else {
 579                 priv->irq = platform_get_irq(pdev, 0);
 580                 if (priv->irq < 0) {
 581                         dev_err(&pdev->dev, "Failed to get platform irq: %d\n",
 582                                 priv->irq);
 583                         return priv->irq;
 584                 }
 585         }
 586
 587         priv->regmap = pdata->regmap;
 588         priv->dev = pdev->dev.parent;
 589         priv->pdev = pdev;
 590
 591         err = devm_request_irq(&pdev->dev, priv->irq,
 592                                mlxreg_hotplug_irq_handler, IRQF_TRIGGER_FALLING
 593                                | IRQF_SHARED, "mlxreg-hotplug", priv);
 594         if (err) {
 595                 dev_err(&pdev->dev, "Failed to request irq: %d\n", err);
 596                 return err;
 597         }
 598
 599         disable_irq(priv->irq);
 600         spin_lock_init(&priv->lock);
 601         INIT_DELAYED_WORK(&priv->dwork_irq, mlxreg_hotplug_work_handler);
 602         /* Perform initial interrupts setup. */
 603         mlxreg_hotplug_set_irq(priv);
 604
 605         priv->after_probe = true;
 606         dev_set_drvdata(&pdev->dev, priv);
 607
 608         err = mlxreg_hotplug_attr_init(priv);
 609         if (err) {
 610                 dev_err(&pdev->dev, "Failed to allocate attributes: %d\n",
 611                         err);
 612                 return err;
 613         }
 614
 615         priv->hwmon = devm_hwmon_device_register_with_groups(&pdev->dev,
 616                                         "mlxreg_hotplug", priv, priv->groups);
 617         if (IS_ERR(priv->hwmon)) {
 618                 dev_err(&pdev->dev, "Failed to register hwmon device %ld\n",
 619                         PTR_ERR(priv->hwmon));
 620                 return PTR_ERR(priv->hwmon);
 621         }
 622
 623         return 0;
 624 }
 625
 626 static int mlxreg_hotplug_remove(struct platform_device *pdev)
 627 {
 628         struct mlxreg_hotplug_priv_data *priv = dev_get_drvdata(&pdev->dev);
 629
 630         /* Clean interrupts setup. */
 631         mlxreg_hotplug_unset_irq(priv);
 632
 633         return 0;
 634 }
 635
 636 static struct platform_driver mlxreg_hotplug_driver = {
 637         .driver = {
 638                 .name = "mlxreg-hotplug",
 639         },
 640         .probe = mlxreg_hotplug_probe,
 641         .remove = mlxreg_hotplug_remove,
 642 };
 643
 644 module_platform_driver(mlxreg_hotplug_driver);
 645
 646 MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
 647 MODULE_DESCRIPTION("Mellanox regmap hotplug platform driver");
 648 MODULE_LICENSE("Dual BSD/GPL");
 649 MODULE_ALIAS("platform:mlxreg-hotplug");