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 #define MLXREG_HOTPLUG_NOT_ASSERT       3
  59
  60 /**
  61  * struct mlxreg_hotplug_priv_data - platform private data:
  62  * @irq: platform device interrupt number;
  63  * @dev: basic device;
  64  * @pdev: platform device;
  65  * @plat: platform data;
  66  * @regmap: register map handle;
  67  * @dwork_irq: delayed work template;
  68  * @lock: spin lock;
  69  * @hwmon: hwmon device;
  70  * @mlxreg_hotplug_attr: sysfs attributes array;
  71  * @mlxreg_hotplug_dev_attr: sysfs sensor device attribute array;
  72  * @group: sysfs attribute group;
  73  * @groups: list of sysfs attribute group for hwmon registration;
  74  * @cell: location of top aggregation interrupt register;
  75  * @mask: top aggregation interrupt common mask;
  76  * @aggr_cache: last value of aggregation register status;
  77  * @after_probe: flag indication probing completion;
  78  * @not_asserted: number of entries in workqueue with no signal assertion;
  79  */
  80 struct mlxreg_hotplug_priv_data {
  81         int irq;
  82         struct device *dev;
  83         struct platform_device *pdev;
  84         struct mlxreg_hotplug_platform_data *plat;
  85         struct regmap *regmap;
  86         struct delayed_work dwork_irq;
  87         spinlock_t lock; /* sync with interrupt */
  88         struct device *hwmon;
  89         struct attribute *mlxreg_hotplug_attr[MLXREG_HOTPLUG_ATTRS_MAX + 1];
  90         struct sensor_device_attribute_2
  91                         mlxreg_hotplug_dev_attr[MLXREG_HOTPLUG_ATTRS_MAX];
  92         struct attribute_group group;
  93         const struct attribute_group *groups[2];
  94         u32 cell;
  95         u32 mask;
  96         u32 aggr_cache;
  97         bool after_probe;
  98         u8 not_asserted;
  99 };
 100
 101 static int mlxreg_hotplug_device_create(struct mlxreg_hotplug_priv_data *priv,
 102                                         struct mlxreg_core_data *data)
 103 {
 104         struct mlxreg_core_hotplug_platform_data *pdata;
 105
 106         /*
 107          * Return if adapter number is negative. It could be in case hotplug
 108          * event is not associated with hotplug device.
 109          */
 110         if (data->hpdev.nr < 0)
 111                 return 0;
 112
 113         pdata = dev_get_platdata(&priv->pdev->dev);
 114         data->hpdev.adapter = i2c_get_adapter(data->hpdev.nr +
 115                                               pdata->shift_nr);
 116         if (!data->hpdev.adapter) {
 117                 dev_err(priv->dev, "Failed to get adapter for bus %d\n",
 118                         data->hpdev.nr + pdata->shift_nr);
 119                 return -EFAULT;
 120         }
 121
 122         data->hpdev.client = i2c_new_device(data->hpdev.adapter,
 123                                             data->hpdev.brdinfo);
 124         if (!data->hpdev.client) {
 125                 dev_err(priv->dev, "Failed to create client %s at bus %d at addr 0x%02x\n",
 126                         data->hpdev.brdinfo->type, data->hpdev.nr +
 127                         pdata->shift_nr, data->hpdev.brdinfo->addr);
 128
 129                 i2c_put_adapter(data->hpdev.adapter);
 130                 data->hpdev.adapter = NULL;
 131                 return -EFAULT;
 132         }
 133
 134         return 0;
 135 }
 136
 137 static void mlxreg_hotplug_device_destroy(struct mlxreg_core_data *data)
 138 {
 139         if (data->hpdev.client) {
 140                 i2c_unregister_device(data->hpdev.client);
 141                 data->hpdev.client = NULL;
 142         }
 143
 144         if (data->hpdev.adapter) {
 145                 i2c_put_adapter(data->hpdev.adapter);
 146                 data->hpdev.adapter = NULL;
 147         }
 148 }
 149
 150 static ssize_t mlxreg_hotplug_attr_show(struct device *dev,
 151                                         struct device_attribute *attr,
 152                                         char *buf)
 153 {
 154         struct mlxreg_hotplug_priv_data *priv = dev_get_drvdata(dev);
 155         struct mlxreg_core_hotplug_platform_data *pdata;
 156         int index = to_sensor_dev_attr_2(attr)->index;
 157         int nr = to_sensor_dev_attr_2(attr)->nr;
 158         struct mlxreg_core_item *item;
 159         struct mlxreg_core_data *data;
 160         u32 regval;
 161         int ret;
 162
 163         pdata = dev_get_platdata(&priv->pdev->dev);
 164         item = pdata->items + nr;
 165         data = item->data + index;
 166
 167         ret = regmap_read(priv->regmap, data->reg, &regval);
 168         if (ret)
 169                 return ret;
 170
 171         if (item->health) {
 172                 regval &= data->mask;
 173         } else {
 174                 /* Bit = 0 : functional if item->inversed is true. */
 175                 if (item->inversed)
 176                         regval = !(regval & data->mask);
 177                 else
 178                         regval = !!(regval & data->mask);
 179         }
 180
 181         return sprintf(buf, "%u\n", regval);
 182 }
 183
 184 #define PRIV_ATTR(i) priv->mlxreg_hotplug_attr[i]
 185 #define PRIV_DEV_ATTR(i) priv->mlxreg_hotplug_dev_attr[i]
 186
 187 static int mlxreg_hotplug_attr_init(struct mlxreg_hotplug_priv_data *priv)
 188 {
 189         struct mlxreg_core_hotplug_platform_data *pdata;
 190         struct mlxreg_core_item *item;
 191         struct mlxreg_core_data *data;
 192         int num_attrs = 0, id = 0, i, j;
 193
 194         pdata = dev_get_platdata(&priv->pdev->dev);
 195         item = pdata->items;
 196
 197         /* Go over all kinds of items - psu, pwr, fan. */
 198         for (i = 0; i < pdata->counter; i++, item++) {
 199                 num_attrs += item->count;
 200                 data = item->data;
 201                 /* Go over all units within the item. */
 202                 for (j = 0; j < item->count; j++, data++, id++) {
 203                         PRIV_ATTR(id) = &PRIV_DEV_ATTR(id).dev_attr.attr;
 204                         PRIV_ATTR(id)->name = devm_kasprintf(&priv->pdev->dev,
 205                                                              GFP_KERNEL,
 206                                                              data->label);
 207
 208                         if (!PRIV_ATTR(id)->name) {
 209                                 dev_err(priv->dev, "Memory allocation failed for attr %d.\n",
 210                                         id);
 211                                 return -ENOMEM;
 212                         }
 213
 214                         PRIV_DEV_ATTR(id).dev_attr.attr.name =
 215                                                         PRIV_ATTR(id)->name;
 216                         PRIV_DEV_ATTR(id).dev_attr.attr.mode = 0444;
 217                         PRIV_DEV_ATTR(id).dev_attr.show =
 218                                                 mlxreg_hotplug_attr_show;
 219                         PRIV_DEV_ATTR(id).nr = i;
 220                         PRIV_DEV_ATTR(id).index = j;
 221                         sysfs_attr_init(&PRIV_DEV_ATTR(id).dev_attr.attr);
 222                 }
 223         }
 224
 225         priv->group.attrs = devm_kcalloc(&priv->pdev->dev,
 226                                          num_attrs,
 227                                          sizeof(struct attribute *),
 228                                          GFP_KERNEL);
 229         if (!priv->group.attrs)
 230                 return -ENOMEM;
 231
 232         priv->group.attrs = priv->mlxreg_hotplug_attr;
 233         priv->groups[0] = &priv->group;
 234         priv->groups[1] = NULL;
 235
 236         return 0;
 237 }
 238
 239 static void
 240 mlxreg_hotplug_work_helper(struct mlxreg_hotplug_priv_data *priv,
 241                            struct mlxreg_core_item *item)
 242 {
 243         struct mlxreg_core_data *data;
 244         u32 asserted, regval, bit;
 245         int ret;
 246
 247         /*
 248          * Validate if item related to received signal type is valid.
 249          * It should never happen, excepted the situation when some
 250          * piece of hardware is broken. In such situation just produce
 251          * error message and return. Caller must continue to handle the
 252          * signals from other devices if any.
 253          */
 254         if (unlikely(!item)) {
 255                 dev_err(priv->dev, "False signal: at offset:mask 0x%02x:0x%02x.\n",
 256                         item->reg, item->mask);
 257
 258                 return;
 259         }
 260
 261         /* Mask event. */
 262         ret = regmap_write(priv->regmap, item->reg + MLXREG_HOTPLUG_MASK_OFF,
 263                            0);
 264         if (ret)
 265                 goto out;
 266
 267         /* Read status. */
 268         ret = regmap_read(priv->regmap, item->reg, &regval);
 269         if (ret)
 270                 goto out;
 271
 272         /* Set asserted bits and save last status. */
 273         regval &= item->mask;
 274         asserted = item->cache ^ regval;
 275         item->cache = regval;
 276
 277         for_each_set_bit(bit, (unsigned long *)&asserted, 8) {
 278                 data = item->data + bit;
 279                 if (regval & BIT(bit)) {
 280                         if (item->inversed)
 281                                 mlxreg_hotplug_device_destroy(data);
 282                         else
 283                                 mlxreg_hotplug_device_create(priv, data);
 284                 } else {
 285                         if (item->inversed)
 286                                 mlxreg_hotplug_device_create(priv, data);
 287                         else
 288                                 mlxreg_hotplug_device_destroy(data);
 289                 }
 290         }
 291
 292         /* Acknowledge event. */
 293         ret = regmap_write(priv->regmap, item->reg + MLXREG_HOTPLUG_EVENT_OFF,
 294                            0);
 295         if (ret)
 296                 goto out;
 297
 298         /* Unmask event. */
 299         ret = regmap_write(priv->regmap, item->reg + MLXREG_HOTPLUG_MASK_OFF,
 300                            item->mask);
 301
 302  out:
 303         if (ret)
 304                 dev_err(priv->dev, "Failed to complete workqueue.\n");
 305 }
 306
 307 static void
 308 mlxreg_hotplug_health_work_helper(struct mlxreg_hotplug_priv_data *priv,
 309                                   struct mlxreg_core_item *item)
 310 {
 311         struct mlxreg_core_data *data = item->data;
 312         u32 regval;
 313         int i, ret = 0;
 314
 315         for (i = 0; i < item->count; i++, data++) {
 316                 /* Mask event. */
 317                 ret = regmap_write(priv->regmap, data->reg +
 318                                    MLXREG_HOTPLUG_MASK_OFF, 0);
 319                 if (ret)
 320                         goto out;
 321
 322                 /* Read status. */
 323                 ret = regmap_read(priv->regmap, data->reg, &regval);
 324                 if (ret)
 325                         goto out;
 326
 327                 regval &= data->mask;
 328                 item->cache = regval;
 329                 if (regval == MLXREG_HOTPLUG_HEALTH_MASK) {
 330                         if ((data->health_cntr++ == MLXREG_HOTPLUG_RST_CNTR) ||
 331                             !priv->after_probe) {
 332                                 mlxreg_hotplug_device_create(priv, data);
 333                                 data->attached = true;
 334                         }
 335                 } else {
 336                         if (data->attached) {
 337                                 mlxreg_hotplug_device_destroy(data);
 338                                 data->attached = false;
 339                                 data->health_cntr = 0;
 340                         }
 341                 }
 342
 343                 /* Acknowledge event. */
 344                 ret = regmap_write(priv->regmap, data->reg +
 345                                    MLXREG_HOTPLUG_EVENT_OFF, 0);
 346                 if (ret)
 347                         goto out;
 348
 349                 /* Unmask event. */
 350                 ret = regmap_write(priv->regmap, data->reg +
 351                                    MLXREG_HOTPLUG_MASK_OFF, data->mask);
 352                 if (ret)
 353                         goto out;
 354         }
 355
 356  out:
 357         if (ret)
 358                 dev_err(priv->dev, "Failed to complete workqueue.\n");
 359 }
 360
 361 /*
 362  * mlxreg_hotplug_work_handler - performs traversing of device interrupt
 363  * registers according to the below hierarchy schema:
 364  *
 365  *                              Aggregation registers (status/mask)
 366  * PSU registers:               *---*
 367  * *-----------------*          |   |
 368  * |status/event/mask|----->    | * |
 369  * *-----------------*          |   |
 370  * Power registers:             |   |
 371  * *-----------------*          |   |
 372  * |status/event/mask|----->    | * |
 373  * *-----------------*          |   |
 374  * FAN registers:               |   |--> CPU
 375  * *-----------------*          |   |
 376  * |status/event/mask|----->    | * |
 377  * *-----------------*          |   |
 378  * ASIC registers:              |   |
 379  * *-----------------*          |   |
 380  * |status/event/mask|----->    | * |
 381  * *-----------------*          |   |
 382  *                              *---*
 383  *
 384  * In case some system changed are detected: FAN in/out, PSU in/out, power
 385  * cable attached/detached, ASIC health good/bad, relevant device is created
 386  * or destroyed.
 387  */
 388 static void mlxreg_hotplug_work_handler(struct work_struct *work)
 389 {
 390         struct mlxreg_core_hotplug_platform_data *pdata;
 391         struct mlxreg_hotplug_priv_data *priv;
 392         struct mlxreg_core_item *item;
 393         u32 regval, aggr_asserted;
 394         unsigned long flags;
 395         int i, ret;
 396
 397         priv = container_of(work, struct mlxreg_hotplug_priv_data,
 398                             dwork_irq.work);
 399         pdata = dev_get_platdata(&priv->pdev->dev);
 400         item = pdata->items;
 401
 402         /* Mask aggregation event. */
 403         ret = regmap_write(priv->regmap, pdata->cell +
 404                            MLXREG_HOTPLUG_AGGR_MASK_OFF, 0);
 405         if (ret < 0)
 406                 goto out;
 407
 408         /* Read aggregation status. */
 409         ret = regmap_read(priv->regmap, pdata->cell, &regval);
 410         if (ret)
 411                 goto out;
 412
 413         regval &= pdata->mask;
 414         aggr_asserted = priv->aggr_cache ^ regval;
 415         priv->aggr_cache = regval;
 416
 417         /*
 418          * Handler is invoked, but no assertion is detected at top aggregation
 419          * status level. Set aggr_asserted to mask value to allow handler extra
 420          * run over all relevant signals to recover any missed signal.
 421          */
 422         if (priv->not_asserted == MLXREG_HOTPLUG_NOT_ASSERT) {
 423                 priv->not_asserted = 0;
 424                 aggr_asserted = pdata->mask;
 425         }
 426         if (!aggr_asserted)
 427                 goto unmask_event;
 428
 429         /* Handle topology and health configuration changes. */
 430         for (i = 0; i < pdata->counter; i++, item++) {
 431                 if (aggr_asserted & item->aggr_mask) {
 432                         if (item->health)
 433                                 mlxreg_hotplug_health_work_helper(priv, item);
 434                         else
 435                                 mlxreg_hotplug_work_helper(priv, item);
 436                 }
 437         }
 438
 439         spin_lock_irqsave(&priv->lock, flags);
 440
 441         /*
 442          * It is possible, that some signals have been inserted, while
 443          * interrupt has been masked by mlxreg_hotplug_work_handler. In this
 444          * case such signals will be missed. In order to handle these signals
 445          * delayed work is canceled and work task re-scheduled for immediate
 446          * execution. It allows to handle missed signals, if any. In other case
 447          * work handler just validates that no new signals have been received
 448          * during masking.
 449          */
 450         cancel_delayed_work(&priv->dwork_irq);
 451         schedule_delayed_work(&priv->dwork_irq, 0);
 452
 453         spin_unlock_irqrestore(&priv->lock, flags);
 454
 455         return;
 456
 457 unmask_event:
 458         priv->not_asserted++;
 459         /* Unmask aggregation event (no need acknowledge). */
 460         ret = regmap_write(priv->regmap, pdata->cell +
 461                            MLXREG_HOTPLUG_AGGR_MASK_OFF, pdata->mask);
 462
 463  out:
 464         if (ret)
 465                 dev_err(priv->dev, "Failed to complete workqueue.\n");
 466 }
 467
 468 static int mlxreg_hotplug_set_irq(struct mlxreg_hotplug_priv_data *priv)
 469 {
 470         struct mlxreg_core_hotplug_platform_data *pdata;
 471         struct mlxreg_core_item *item;
 472         int i, ret;
 473
 474         pdata = dev_get_platdata(&priv->pdev->dev);
 475         item = pdata->items;
 476
 477         for (i = 0; i < pdata->counter; i++, item++) {
 478                 /* Clear group presense event. */
 479                 ret = regmap_write(priv->regmap, item->reg +
 480                                    MLXREG_HOTPLUG_EVENT_OFF, 0);
 481                 if (ret)
 482                         goto out;
 483
 484                 /* Set group initial status as mask and unmask group event. */
 485                 if (item->inversed) {
 486                         item->cache = item->mask;
 487                         ret = regmap_write(priv->regmap, item->reg +
 488                                            MLXREG_HOTPLUG_MASK_OFF,
 489                                            item->mask);
 490                         if (ret)
 491                                 goto out;
 492                 }
 493         }
 494
 495         /* Keep aggregation initial status as zero and unmask events. */
 496         ret = regmap_write(priv->regmap, pdata->cell +
 497                            MLXREG_HOTPLUG_AGGR_MASK_OFF, pdata->mask);
 498         if (ret)
 499                 goto out;
 500
 501         /* Keep low aggregation initial status as zero and unmask events. */
 502         if (pdata->cell_low) {
 503                 ret = regmap_write(priv->regmap, pdata->cell_low +
 504                                    MLXREG_HOTPLUG_AGGR_MASK_OFF,
 505                                    pdata->mask_low);
 506                 if (ret)
 507                         goto out;
 508         }
 509
 510         /* Invoke work handler for initializing hot plug devices setting. */
 511         mlxreg_hotplug_work_handler(&priv->dwork_irq.work);
 512
 513  out:
 514         if (ret)
 515                 dev_err(priv->dev, "Failed to set interrupts.\n");
 516         enable_irq(priv->irq);
 517         return ret;
 518 }
 519
 520 static void mlxreg_hotplug_unset_irq(struct mlxreg_hotplug_priv_data *priv)
 521 {
 522         struct mlxreg_core_hotplug_platform_data *pdata;
 523         struct mlxreg_core_item *item;
 524         struct mlxreg_core_data *data;
 525         int count, i, j;
 526
 527         pdata = dev_get_platdata(&priv->pdev->dev);
 528         item = pdata->items;
 529         disable_irq(priv->irq);
 530         cancel_delayed_work_sync(&priv->dwork_irq);
 531
 532         /* Mask low aggregation event, if defined. */
 533         if (pdata->cell_low)
 534                 regmap_write(priv->regmap, pdata->cell_low +
 535                              MLXREG_HOTPLUG_AGGR_MASK_OFF, 0);
 536
 537         /* Mask aggregation event. */
 538         regmap_write(priv->regmap, pdata->cell + MLXREG_HOTPLUG_AGGR_MASK_OFF,
 539                      0);
 540
 541         /* Clear topology configurations. */
 542         for (i = 0; i < pdata->counter; i++, item++) {
 543                 data = item->data;
 544                 /* Mask group presense event. */
 545                 regmap_write(priv->regmap, data->reg + MLXREG_HOTPLUG_MASK_OFF,
 546                              0);
 547                 /* Clear group presense event. */
 548                 regmap_write(priv->regmap, data->reg +
 549                              MLXREG_HOTPLUG_EVENT_OFF, 0);
 550
 551                 /* Remove all the attached devices in group. */
 552                 count = item->count;
 553                 for (j = 0; j < count; j++, data++)
 554                         mlxreg_hotplug_device_destroy(data);
 555         }
 556 }
 557
 558 static irqreturn_t mlxreg_hotplug_irq_handler(int irq, void *dev)
 559 {
 560         struct mlxreg_hotplug_priv_data *priv;
 561
 562         priv = (struct mlxreg_hotplug_priv_data *)dev;
 563
 564         /* Schedule work task for immediate execution.*/
 565         schedule_delayed_work(&priv->dwork_irq, 0);
 566
 567         return IRQ_HANDLED;
 568 }
 569
 570 static int mlxreg_hotplug_probe(struct platform_device *pdev)
 571 {
 572         struct mlxreg_core_hotplug_platform_data *pdata;
 573         struct mlxreg_hotplug_priv_data *priv;
 574         struct i2c_adapter *deferred_adap;
 575         int err;
 576
 577         pdata = dev_get_platdata(&pdev->dev);
 578         if (!pdata) {
 579                 dev_err(&pdev->dev, "Failed to get platform data.\n");
 580                 return -EINVAL;
 581         }
 582
 583         /* Defer probing if the necessary adapter is not configured yet. */
 584         deferred_adap = i2c_get_adapter(pdata->deferred_nr);
 585         if (!deferred_adap)
 586                 return -EPROBE_DEFER;
 587         i2c_put_adapter(deferred_adap);
 588
 589         priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
 590         if (!priv)
 591                 return -ENOMEM;
 592
 593         if (pdata->irq) {
 594                 priv->irq = pdata->irq;
 595         } else {
 596                 priv->irq = platform_get_irq(pdev, 0);
 597                 if (priv->irq < 0) {
 598                         dev_err(&pdev->dev, "Failed to get platform irq: %d\n",
 599                                 priv->irq);
 600                         return priv->irq;
 601                 }
 602         }
 603
 604         priv->regmap = pdata->regmap;
 605         priv->dev = pdev->dev.parent;
 606         priv->pdev = pdev;
 607
 608         err = devm_request_irq(&pdev->dev, priv->irq,
 609                                mlxreg_hotplug_irq_handler, IRQF_TRIGGER_FALLING
 610                                | IRQF_SHARED, "mlxreg-hotplug", priv);
 611         if (err) {
 612                 dev_err(&pdev->dev, "Failed to request irq: %d\n", err);
 613                 return err;
 614         }
 615
 616         disable_irq(priv->irq);
 617         spin_lock_init(&priv->lock);
 618         INIT_DELAYED_WORK(&priv->dwork_irq, mlxreg_hotplug_work_handler);
 619         /* Perform initial interrupts setup. */
 620         mlxreg_hotplug_set_irq(priv);
 621
 622         priv->after_probe = true;
 623         dev_set_drvdata(&pdev->dev, priv);
 624
 625         err = mlxreg_hotplug_attr_init(priv);
 626         if (err) {
 627                 dev_err(&pdev->dev, "Failed to allocate attributes: %d\n",
 628                         err);
 629                 return err;
 630         }
 631
 632         priv->hwmon = devm_hwmon_device_register_with_groups(&pdev->dev,
 633                                         "mlxreg_hotplug", priv, priv->groups);
 634         if (IS_ERR(priv->hwmon)) {
 635                 dev_err(&pdev->dev, "Failed to register hwmon device %ld\n",
 636                         PTR_ERR(priv->hwmon));
 637                 return PTR_ERR(priv->hwmon);
 638         }
 639
 640         return 0;
 641 }
 642
 643 static int mlxreg_hotplug_remove(struct platform_device *pdev)
 644 {
 645         struct mlxreg_hotplug_priv_data *priv = dev_get_drvdata(&pdev->dev);
 646
 647         /* Clean interrupts setup. */
 648         mlxreg_hotplug_unset_irq(priv);
 649
 650         return 0;
 651 }
 652
 653 static struct platform_driver mlxreg_hotplug_driver = {
 654         .driver = {
 655                 .name = "mlxreg-hotplug",
 656         },
 657         .probe = mlxreg_hotplug_probe,
 658         .remove = mlxreg_hotplug_remove,
 659 };
 660
 661 module_platform_driver(mlxreg_hotplug_driver);
 662
 663 MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
 664 MODULE_DESCRIPTION("Mellanox regmap hotplug platform driver");
 665 MODULE_LICENSE("Dual BSD/GPL");
 666 MODULE_ALIAS("platform:mlxreg-hotplug");