1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Mellanox hotplug driver 4 * 5 * Copyright (C) 2016-2020 Mellanox Technologies 6 */ 7 8 #include <linux/bitops.h> 9 #include <linux/device.h> 10 #include <linux/hwmon.h> 11 #include <linux/hwmon-sysfs.h> 12 #include <linux/i2c.h> 13 #include <linux/interrupt.h> 14 #include <linux/module.h> 15 #include <linux/of_device.h> 16 #include <linux/platform_data/mlxreg.h> 17 #include <linux/platform_device.h> 18 #include <linux/spinlock.h> 19 #include <linux/string_helpers.h> 20 #include <linux/regmap.h> 21 #include <linux/workqueue.h> 22 23 /* Offset of event and mask registers from status register. */ 24 #define MLXREG_HOTPLUG_EVENT_OFF 1 25 #define MLXREG_HOTPLUG_MASK_OFF 2 26 #define MLXREG_HOTPLUG_AGGR_MASK_OFF 1 27 28 /* ASIC good health mask. */ 29 #define MLXREG_HOTPLUG_GOOD_HEALTH_MASK 0x02 30 31 #define MLXREG_HOTPLUG_ATTRS_MAX 128 32 #define MLXREG_HOTPLUG_NOT_ASSERT 3 33 34 /** 35 * struct mlxreg_hotplug_priv_data - platform private data: 36 * @irq: platform device interrupt number; 37 * @dev: basic device; 38 * @pdev: platform device; 39 * @plat: platform data; 40 * @regmap: register map handle; 41 * @dwork_irq: delayed work template; 42 * @lock: spin lock; 43 * @hwmon: hwmon device; 44 * @mlxreg_hotplug_attr: sysfs attributes array; 45 * @mlxreg_hotplug_dev_attr: sysfs sensor device attribute array; 46 * @group: sysfs attribute group; 47 * @groups: list of sysfs attribute group for hwmon registration; 48 * @cell: location of top aggregation interrupt register; 49 * @mask: top aggregation interrupt common mask; 50 * @aggr_cache: last value of aggregation register status; 51 * @after_probe: flag indication probing completion; 52 * @not_asserted: number of entries in workqueue with no signal assertion; 53 */ 54 struct mlxreg_hotplug_priv_data { 55 int irq; 56 struct device *dev; 57 struct platform_device *pdev; 58 struct mlxreg_hotplug_platform_data *plat; 59 struct regmap *regmap; 60 struct delayed_work dwork_irq; 61 spinlock_t lock; /* sync with interrupt */ 62 struct device *hwmon; 63 struct attribute *mlxreg_hotplug_attr[MLXREG_HOTPLUG_ATTRS_MAX + 1]; 64 struct sensor_device_attribute_2 65 mlxreg_hotplug_dev_attr[MLXREG_HOTPLUG_ATTRS_MAX]; 66 struct attribute_group group; 67 const struct attribute_group *groups[2]; 68 u32 cell; 69 u32 mask; 70 u32 aggr_cache; 71 bool after_probe; 72 u8 not_asserted; 73 }; 74 75 /* Environment variables array for udev. */ 76 static char *mlxreg_hotplug_udev_envp[] = { NULL, NULL }; 77 78 static int 79 mlxreg_hotplug_udev_event_send(struct kobject *kobj, 80 struct mlxreg_core_data *data, bool action) 81 { 82 char event_str[MLXREG_CORE_LABEL_MAX_SIZE + 2]; 83 char label[MLXREG_CORE_LABEL_MAX_SIZE] = { 0 }; 84 85 mlxreg_hotplug_udev_envp[0] = event_str; 86 string_upper(label, data->label); 87 snprintf(event_str, MLXREG_CORE_LABEL_MAX_SIZE, "%s=%d", label, !!action); 88 89 return kobject_uevent_env(kobj, KOBJ_CHANGE, mlxreg_hotplug_udev_envp); 90 } 91 92 static void 93 mlxreg_hotplug_pdata_export(void *pdata, void *regmap) 94 { 95 struct mlxreg_core_hotplug_platform_data *dev_pdata = pdata; 96 97 /* Export regmap to underlying device. */ 98 dev_pdata->regmap = regmap; 99 } 100 101 static int mlxreg_hotplug_device_create(struct mlxreg_hotplug_priv_data *priv, 102 struct mlxreg_core_data *data, 103 enum mlxreg_hotplug_kind kind) 104 { 105 struct i2c_board_info *brdinfo = data->hpdev.brdinfo; 106 struct mlxreg_core_hotplug_platform_data *pdata; 107 struct i2c_client *client; 108 109 /* Notify user by sending hwmon uevent. */ 110 mlxreg_hotplug_udev_event_send(&priv->hwmon->kobj, data, true); 111 112 /* 113 * Return if adapter number is negative. It could be in case hotplug 114 * event is not associated with hotplug device. 115 */ 116 if (data->hpdev.nr < 0) 117 return 0; 118 119 pdata = dev_get_platdata(&priv->pdev->dev); 120 switch (data->hpdev.action) { 121 case MLXREG_HOTPLUG_DEVICE_DEFAULT_ACTION: 122 data->hpdev.adapter = i2c_get_adapter(data->hpdev.nr + 123 pdata->shift_nr); 124 if (!data->hpdev.adapter) { 125 dev_err(priv->dev, "Failed to get adapter for bus %d\n", 126 data->hpdev.nr + pdata->shift_nr); 127 return -EFAULT; 128 } 129 130 /* Export platform data to underlying device. */ 131 if (brdinfo->platform_data) 132 mlxreg_hotplug_pdata_export(brdinfo->platform_data, pdata->regmap); 133 134 client = i2c_new_client_device(data->hpdev.adapter, 135 brdinfo); 136 if (IS_ERR(client)) { 137 dev_err(priv->dev, "Failed to create client %s at bus %d at addr 0x%02x\n", 138 brdinfo->type, data->hpdev.nr + 139 pdata->shift_nr, brdinfo->addr); 140 141 i2c_put_adapter(data->hpdev.adapter); 142 data->hpdev.adapter = NULL; 143 return PTR_ERR(client); 144 } 145 146 data->hpdev.client = client; 147 break; 148 case MLXREG_HOTPLUG_DEVICE_PLATFORM_ACTION: 149 /* Export platform data to underlying device. */ 150 if (data->hpdev.brdinfo && data->hpdev.brdinfo->platform_data) 151 mlxreg_hotplug_pdata_export(data->hpdev.brdinfo->platform_data, 152 pdata->regmap); 153 /* Pass parent hotplug device handle to underlying device. */ 154 data->notifier = data->hpdev.notifier; 155 data->hpdev.pdev = platform_device_register_resndata(&priv->pdev->dev, 156 brdinfo->type, 157 data->hpdev.nr, 158 NULL, 0, data, 159 sizeof(*data)); 160 if (IS_ERR(data->hpdev.pdev)) 161 return PTR_ERR(data->hpdev.pdev); 162 163 break; 164 default: 165 break; 166 } 167 168 if (data->hpdev.notifier && data->hpdev.notifier->user_handler) 169 return data->hpdev.notifier->user_handler(data->hpdev.notifier->handle, kind, 1); 170 171 return 0; 172 } 173 174 static void 175 mlxreg_hotplug_device_destroy(struct mlxreg_hotplug_priv_data *priv, 176 struct mlxreg_core_data *data, 177 enum mlxreg_hotplug_kind kind) 178 { 179 /* Notify user by sending hwmon uevent. */ 180 mlxreg_hotplug_udev_event_send(&priv->hwmon->kobj, data, false); 181 if (data->hpdev.notifier && data->hpdev.notifier->user_handler) 182 data->hpdev.notifier->user_handler(data->hpdev.notifier->handle, kind, 0); 183 184 switch (data->hpdev.action) { 185 case MLXREG_HOTPLUG_DEVICE_DEFAULT_ACTION: 186 if (data->hpdev.client) { 187 i2c_unregister_device(data->hpdev.client); 188 data->hpdev.client = NULL; 189 } 190 191 if (data->hpdev.adapter) { 192 i2c_put_adapter(data->hpdev.adapter); 193 data->hpdev.adapter = NULL; 194 } 195 break; 196 case MLXREG_HOTPLUG_DEVICE_PLATFORM_ACTION: 197 if (data->hpdev.pdev) 198 platform_device_unregister(data->hpdev.pdev); 199 break; 200 default: 201 break; 202 } 203 } 204 205 static ssize_t mlxreg_hotplug_attr_show(struct device *dev, 206 struct device_attribute *attr, 207 char *buf) 208 { 209 struct mlxreg_hotplug_priv_data *priv = dev_get_drvdata(dev); 210 struct mlxreg_core_hotplug_platform_data *pdata; 211 int index = to_sensor_dev_attr_2(attr)->index; 212 int nr = to_sensor_dev_attr_2(attr)->nr; 213 struct mlxreg_core_item *item; 214 struct mlxreg_core_data *data; 215 u32 regval; 216 int ret; 217 218 pdata = dev_get_platdata(&priv->pdev->dev); 219 item = pdata->items + nr; 220 data = item->data + index; 221 222 ret = regmap_read(priv->regmap, data->reg, ®val); 223 if (ret) 224 return ret; 225 226 if (item->health) { 227 regval &= data->mask; 228 } else { 229 /* Bit = 0 : functional if item->inversed is true. */ 230 if (item->inversed) 231 regval = !(regval & data->mask); 232 else 233 regval = !!(regval & data->mask); 234 } 235 236 return sprintf(buf, "%u\n", regval); 237 } 238 239 #define PRIV_ATTR(i) priv->mlxreg_hotplug_attr[i] 240 #define PRIV_DEV_ATTR(i) priv->mlxreg_hotplug_dev_attr[i] 241 242 static int mlxreg_hotplug_item_label_index_get(u32 mask, u32 bit) 243 { 244 int i, j; 245 246 for (i = 0, j = -1; i <= bit; i++) { 247 if (mask & BIT(i)) 248 j++; 249 } 250 return j; 251 } 252 253 static int mlxreg_hotplug_attr_init(struct mlxreg_hotplug_priv_data *priv) 254 { 255 struct mlxreg_core_hotplug_platform_data *pdata; 256 struct mlxreg_core_item *item; 257 struct mlxreg_core_data *data; 258 unsigned long mask; 259 u32 regval; 260 int num_attrs = 0, id = 0, i, j, k, count, ret; 261 262 pdata = dev_get_platdata(&priv->pdev->dev); 263 item = pdata->items; 264 265 /* Go over all kinds of items - psu, pwr, fan. */ 266 for (i = 0; i < pdata->counter; i++, item++) { 267 if (item->capability) { 268 /* 269 * Read group capability register to get actual number 270 * of interrupt capable components and set group mask 271 * accordingly. 272 */ 273 ret = regmap_read(priv->regmap, item->capability, 274 ®val); 275 if (ret) 276 return ret; 277 278 item->mask = GENMASK((regval & item->mask) - 1, 0); 279 } 280 281 data = item->data; 282 283 /* Go over all unmasked units within item. */ 284 mask = item->mask; 285 k = 0; 286 count = item->ind ? item->ind : item->count; 287 for_each_set_bit(j, &mask, count) { 288 if (data->capability) { 289 /* 290 * Read capability register and skip non 291 * relevant attributes. 292 */ 293 ret = regmap_read(priv->regmap, 294 data->capability, ®val); 295 if (ret) 296 return ret; 297 298 if (!(regval & data->bit)) { 299 data++; 300 continue; 301 } 302 } 303 304 PRIV_ATTR(id) = &PRIV_DEV_ATTR(id).dev_attr.attr; 305 PRIV_ATTR(id)->name = devm_kasprintf(&priv->pdev->dev, 306 GFP_KERNEL, 307 data->label); 308 if (!PRIV_ATTR(id)->name) { 309 dev_err(priv->dev, "Memory allocation failed for attr %d.\n", 310 id); 311 return -ENOMEM; 312 } 313 314 PRIV_DEV_ATTR(id).dev_attr.attr.name = 315 PRIV_ATTR(id)->name; 316 PRIV_DEV_ATTR(id).dev_attr.attr.mode = 0444; 317 PRIV_DEV_ATTR(id).dev_attr.show = 318 mlxreg_hotplug_attr_show; 319 PRIV_DEV_ATTR(id).nr = i; 320 PRIV_DEV_ATTR(id).index = k; 321 sysfs_attr_init(&PRIV_DEV_ATTR(id).dev_attr.attr); 322 data++; 323 id++; 324 k++; 325 } 326 num_attrs += k; 327 } 328 329 priv->group.attrs = devm_kcalloc(&priv->pdev->dev, 330 num_attrs, 331 sizeof(struct attribute *), 332 GFP_KERNEL); 333 if (!priv->group.attrs) 334 return -ENOMEM; 335 336 priv->group.attrs = priv->mlxreg_hotplug_attr; 337 priv->groups[0] = &priv->group; 338 priv->groups[1] = NULL; 339 340 return 0; 341 } 342 343 static void 344 mlxreg_hotplug_work_helper(struct mlxreg_hotplug_priv_data *priv, 345 struct mlxreg_core_item *item) 346 { 347 struct mlxreg_core_data *data; 348 unsigned long asserted; 349 u32 regval, bit; 350 int ret; 351 352 /* 353 * Validate if item related to received signal type is valid. 354 * It should never happen, excepted the situation when some 355 * piece of hardware is broken. In such situation just produce 356 * error message and return. Caller must continue to handle the 357 * signals from other devices if any. 358 */ 359 if (unlikely(!item)) { 360 dev_err(priv->dev, "False signal: at offset:mask 0x%02x:0x%02x.\n", 361 item->reg, item->mask); 362 363 return; 364 } 365 366 /* Mask event. */ 367 ret = regmap_write(priv->regmap, item->reg + MLXREG_HOTPLUG_MASK_OFF, 368 0); 369 if (ret) 370 goto out; 371 372 /* Read status. */ 373 ret = regmap_read(priv->regmap, item->reg, ®val); 374 if (ret) 375 goto out; 376 377 /* Set asserted bits and save last status. */ 378 regval &= item->mask; 379 asserted = item->cache ^ regval; 380 item->cache = regval; 381 for_each_set_bit(bit, &asserted, 8) { 382 int pos; 383 384 pos = mlxreg_hotplug_item_label_index_get(item->mask, bit); 385 if (pos < 0) 386 goto out; 387 388 data = item->data + pos; 389 if (regval & BIT(bit)) { 390 if (item->inversed) 391 mlxreg_hotplug_device_destroy(priv, data, item->kind); 392 else 393 mlxreg_hotplug_device_create(priv, data, item->kind); 394 } else { 395 if (item->inversed) 396 mlxreg_hotplug_device_create(priv, data, item->kind); 397 else 398 mlxreg_hotplug_device_destroy(priv, data, item->kind); 399 } 400 } 401 402 /* Acknowledge event. */ 403 ret = regmap_write(priv->regmap, item->reg + MLXREG_HOTPLUG_EVENT_OFF, 404 0); 405 if (ret) 406 goto out; 407 408 /* Unmask event. */ 409 ret = regmap_write(priv->regmap, item->reg + MLXREG_HOTPLUG_MASK_OFF, 410 item->mask); 411 412 out: 413 if (ret) 414 dev_err(priv->dev, "Failed to complete workqueue.\n"); 415 } 416 417 static void 418 mlxreg_hotplug_health_work_helper(struct mlxreg_hotplug_priv_data *priv, 419 struct mlxreg_core_item *item) 420 { 421 struct mlxreg_core_data *data = item->data; 422 u32 regval; 423 int i, ret = 0; 424 425 for (i = 0; i < item->count; i++, data++) { 426 /* Mask event. */ 427 ret = regmap_write(priv->regmap, data->reg + 428 MLXREG_HOTPLUG_MASK_OFF, 0); 429 if (ret) 430 goto out; 431 432 /* Read status. */ 433 ret = regmap_read(priv->regmap, data->reg, ®val); 434 if (ret) 435 goto out; 436 437 regval &= data->mask; 438 439 if (item->cache == regval) 440 goto ack_event; 441 442 /* 443 * ASIC health indication is provided through two bits. Bits 444 * value 0x2 indicates that ASIC reached the good health, value 445 * 0x0 indicates ASIC the bad health or dormant state and value 446 * 0x3 indicates the booting state. During ASIC reset it should 447 * pass the following states: dormant -> booting -> good. 448 */ 449 if (regval == MLXREG_HOTPLUG_GOOD_HEALTH_MASK) { 450 if (!data->attached) { 451 /* 452 * ASIC is in steady state. Connect associated 453 * device, if configured. 454 */ 455 mlxreg_hotplug_device_create(priv, data, item->kind); 456 data->attached = true; 457 } 458 } else { 459 if (data->attached) { 460 /* 461 * ASIC health is failed after ASIC has been 462 * in steady state. Disconnect associated 463 * device, if it has been connected. 464 */ 465 mlxreg_hotplug_device_destroy(priv, data, item->kind); 466 data->attached = false; 467 data->health_cntr = 0; 468 } 469 } 470 item->cache = regval; 471 ack_event: 472 /* Acknowledge event. */ 473 ret = regmap_write(priv->regmap, data->reg + 474 MLXREG_HOTPLUG_EVENT_OFF, 0); 475 if (ret) 476 goto out; 477 478 /* Unmask event. */ 479 ret = regmap_write(priv->regmap, data->reg + 480 MLXREG_HOTPLUG_MASK_OFF, data->mask); 481 if (ret) 482 goto out; 483 } 484 485 out: 486 if (ret) 487 dev_err(priv->dev, "Failed to complete workqueue.\n"); 488 } 489 490 /* 491 * mlxreg_hotplug_work_handler - performs traversing of device interrupt 492 * registers according to the below hierarchy schema: 493 * 494 * Aggregation registers (status/mask) 495 * PSU registers: *---* 496 * *-----------------* | | 497 * |status/event/mask|-----> | * | 498 * *-----------------* | | 499 * Power registers: | | 500 * *-----------------* | | 501 * |status/event/mask|-----> | * | 502 * *-----------------* | | 503 * FAN registers: | |--> CPU 504 * *-----------------* | | 505 * |status/event/mask|-----> | * | 506 * *-----------------* | | 507 * ASIC registers: | | 508 * *-----------------* | | 509 * |status/event/mask|-----> | * | 510 * *-----------------* | | 511 * *---* 512 * 513 * In case some system changed are detected: FAN in/out, PSU in/out, power 514 * cable attached/detached, ASIC health good/bad, relevant device is created 515 * or destroyed. 516 */ 517 static void mlxreg_hotplug_work_handler(struct work_struct *work) 518 { 519 struct mlxreg_core_hotplug_platform_data *pdata; 520 struct mlxreg_hotplug_priv_data *priv; 521 struct mlxreg_core_item *item; 522 u32 regval, aggr_asserted; 523 unsigned long flags; 524 int i, ret; 525 526 priv = container_of(work, struct mlxreg_hotplug_priv_data, 527 dwork_irq.work); 528 pdata = dev_get_platdata(&priv->pdev->dev); 529 item = pdata->items; 530 531 /* Mask aggregation event. */ 532 ret = regmap_write(priv->regmap, pdata->cell + 533 MLXREG_HOTPLUG_AGGR_MASK_OFF, 0); 534 if (ret < 0) 535 goto out; 536 537 /* Read aggregation status. */ 538 ret = regmap_read(priv->regmap, pdata->cell, ®val); 539 if (ret) 540 goto out; 541 542 regval &= pdata->mask; 543 aggr_asserted = priv->aggr_cache ^ regval; 544 priv->aggr_cache = regval; 545 546 /* 547 * Handler is invoked, but no assertion is detected at top aggregation 548 * status level. Set aggr_asserted to mask value to allow handler extra 549 * run over all relevant signals to recover any missed signal. 550 */ 551 if (priv->not_asserted == MLXREG_HOTPLUG_NOT_ASSERT) { 552 priv->not_asserted = 0; 553 aggr_asserted = pdata->mask; 554 } 555 if (!aggr_asserted) 556 goto unmask_event; 557 558 /* Handle topology and health configuration changes. */ 559 for (i = 0; i < pdata->counter; i++, item++) { 560 if (aggr_asserted & item->aggr_mask) { 561 if (item->health) 562 mlxreg_hotplug_health_work_helper(priv, item); 563 else 564 mlxreg_hotplug_work_helper(priv, item); 565 } 566 } 567 568 spin_lock_irqsave(&priv->lock, flags); 569 570 /* 571 * It is possible, that some signals have been inserted, while 572 * interrupt has been masked by mlxreg_hotplug_work_handler. In this 573 * case such signals will be missed. In order to handle these signals 574 * delayed work is canceled and work task re-scheduled for immediate 575 * execution. It allows to handle missed signals, if any. In other case 576 * work handler just validates that no new signals have been received 577 * during masking. 578 */ 579 cancel_delayed_work(&priv->dwork_irq); 580 schedule_delayed_work(&priv->dwork_irq, 0); 581 582 spin_unlock_irqrestore(&priv->lock, flags); 583 584 return; 585 586 unmask_event: 587 priv->not_asserted++; 588 /* Unmask aggregation event (no need acknowledge). */ 589 ret = regmap_write(priv->regmap, pdata->cell + 590 MLXREG_HOTPLUG_AGGR_MASK_OFF, pdata->mask); 591 592 out: 593 if (ret) 594 dev_err(priv->dev, "Failed to complete workqueue.\n"); 595 } 596 597 static int mlxreg_hotplug_set_irq(struct mlxreg_hotplug_priv_data *priv) 598 { 599 struct mlxreg_core_hotplug_platform_data *pdata; 600 struct mlxreg_core_item *item; 601 struct mlxreg_core_data *data; 602 u32 regval; 603 int i, j, ret; 604 605 pdata = dev_get_platdata(&priv->pdev->dev); 606 item = pdata->items; 607 608 for (i = 0; i < pdata->counter; i++, item++) { 609 /* Clear group presense event. */ 610 ret = regmap_write(priv->regmap, item->reg + 611 MLXREG_HOTPLUG_EVENT_OFF, 0); 612 if (ret) 613 goto out; 614 615 /* 616 * Verify if hardware configuration requires to disable 617 * interrupt capability for some of components. 618 */ 619 data = item->data; 620 for (j = 0; j < item->count; j++, data++) { 621 /* Verify if the attribute has capability register. */ 622 if (data->capability) { 623 /* Read capability register. */ 624 ret = regmap_read(priv->regmap, 625 data->capability, ®val); 626 if (ret) 627 goto out; 628 629 if (!(regval & data->bit)) 630 item->mask &= ~BIT(j); 631 } 632 } 633 634 /* Set group initial status as mask and unmask group event. */ 635 if (item->inversed) { 636 item->cache = item->mask; 637 ret = regmap_write(priv->regmap, item->reg + 638 MLXREG_HOTPLUG_MASK_OFF, 639 item->mask); 640 if (ret) 641 goto out; 642 } 643 } 644 645 /* Keep aggregation initial status as zero and unmask events. */ 646 ret = regmap_write(priv->regmap, pdata->cell + 647 MLXREG_HOTPLUG_AGGR_MASK_OFF, pdata->mask); 648 if (ret) 649 goto out; 650 651 /* Keep low aggregation initial status as zero and unmask events. */ 652 if (pdata->cell_low) { 653 ret = regmap_write(priv->regmap, pdata->cell_low + 654 MLXREG_HOTPLUG_AGGR_MASK_OFF, 655 pdata->mask_low); 656 if (ret) 657 goto out; 658 } 659 660 /* Invoke work handler for initializing hot plug devices setting. */ 661 mlxreg_hotplug_work_handler(&priv->dwork_irq.work); 662 663 out: 664 if (ret) 665 dev_err(priv->dev, "Failed to set interrupts.\n"); 666 enable_irq(priv->irq); 667 return ret; 668 } 669 670 static void mlxreg_hotplug_unset_irq(struct mlxreg_hotplug_priv_data *priv) 671 { 672 struct mlxreg_core_hotplug_platform_data *pdata; 673 struct mlxreg_core_item *item; 674 struct mlxreg_core_data *data; 675 int count, i, j; 676 677 pdata = dev_get_platdata(&priv->pdev->dev); 678 item = pdata->items; 679 disable_irq(priv->irq); 680 cancel_delayed_work_sync(&priv->dwork_irq); 681 682 /* Mask low aggregation event, if defined. */ 683 if (pdata->cell_low) 684 regmap_write(priv->regmap, pdata->cell_low + 685 MLXREG_HOTPLUG_AGGR_MASK_OFF, 0); 686 687 /* Mask aggregation event. */ 688 regmap_write(priv->regmap, pdata->cell + MLXREG_HOTPLUG_AGGR_MASK_OFF, 689 0); 690 691 /* Clear topology configurations. */ 692 for (i = 0; i < pdata->counter; i++, item++) { 693 data = item->data; 694 /* Mask group presense event. */ 695 regmap_write(priv->regmap, data->reg + MLXREG_HOTPLUG_MASK_OFF, 696 0); 697 /* Clear group presense event. */ 698 regmap_write(priv->regmap, data->reg + 699 MLXREG_HOTPLUG_EVENT_OFF, 0); 700 701 /* Remove all the attached devices in group. */ 702 count = item->count; 703 for (j = 0; j < count; j++, data++) 704 mlxreg_hotplug_device_destroy(priv, data, item->kind); 705 } 706 } 707 708 static irqreturn_t mlxreg_hotplug_irq_handler(int irq, void *dev) 709 { 710 struct mlxreg_hotplug_priv_data *priv; 711 712 priv = (struct mlxreg_hotplug_priv_data *)dev; 713 714 /* Schedule work task for immediate execution.*/ 715 schedule_delayed_work(&priv->dwork_irq, 0); 716 717 return IRQ_HANDLED; 718 } 719 720 static int mlxreg_hotplug_probe(struct platform_device *pdev) 721 { 722 struct mlxreg_core_hotplug_platform_data *pdata; 723 struct mlxreg_hotplug_priv_data *priv; 724 struct i2c_adapter *deferred_adap; 725 int err; 726 727 pdata = dev_get_platdata(&pdev->dev); 728 if (!pdata) { 729 dev_err(&pdev->dev, "Failed to get platform data.\n"); 730 return -EINVAL; 731 } 732 733 /* Defer probing if the necessary adapter is not configured yet. */ 734 deferred_adap = i2c_get_adapter(pdata->deferred_nr); 735 if (!deferred_adap) 736 return -EPROBE_DEFER; 737 i2c_put_adapter(deferred_adap); 738 739 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); 740 if (!priv) 741 return -ENOMEM; 742 743 if (pdata->irq) { 744 priv->irq = pdata->irq; 745 } else { 746 priv->irq = platform_get_irq(pdev, 0); 747 if (priv->irq < 0) 748 return priv->irq; 749 } 750 751 priv->regmap = pdata->regmap; 752 priv->dev = pdev->dev.parent; 753 priv->pdev = pdev; 754 755 err = devm_request_irq(&pdev->dev, priv->irq, 756 mlxreg_hotplug_irq_handler, IRQF_TRIGGER_FALLING 757 | IRQF_SHARED, "mlxreg-hotplug", priv); 758 if (err) { 759 dev_err(&pdev->dev, "Failed to request irq: %d\n", err); 760 return err; 761 } 762 763 disable_irq(priv->irq); 764 spin_lock_init(&priv->lock); 765 INIT_DELAYED_WORK(&priv->dwork_irq, mlxreg_hotplug_work_handler); 766 dev_set_drvdata(&pdev->dev, priv); 767 768 err = mlxreg_hotplug_attr_init(priv); 769 if (err) { 770 dev_err(&pdev->dev, "Failed to allocate attributes: %d\n", 771 err); 772 return err; 773 } 774 775 priv->hwmon = devm_hwmon_device_register_with_groups(&pdev->dev, 776 "mlxreg_hotplug", priv, priv->groups); 777 if (IS_ERR(priv->hwmon)) { 778 dev_err(&pdev->dev, "Failed to register hwmon device %ld\n", 779 PTR_ERR(priv->hwmon)); 780 return PTR_ERR(priv->hwmon); 781 } 782 783 /* Perform initial interrupts setup. */ 784 mlxreg_hotplug_set_irq(priv); 785 priv->after_probe = true; 786 787 return 0; 788 } 789 790 static int mlxreg_hotplug_remove(struct platform_device *pdev) 791 { 792 struct mlxreg_hotplug_priv_data *priv = dev_get_drvdata(&pdev->dev); 793 794 /* Clean interrupts setup. */ 795 mlxreg_hotplug_unset_irq(priv); 796 devm_free_irq(&pdev->dev, priv->irq, priv); 797 798 return 0; 799 } 800 801 static struct platform_driver mlxreg_hotplug_driver = { 802 .driver = { 803 .name = "mlxreg-hotplug", 804 }, 805 .probe = mlxreg_hotplug_probe, 806 .remove = mlxreg_hotplug_remove, 807 }; 808 809 module_platform_driver(mlxreg_hotplug_driver); 810 811 MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>"); 812 MODULE_DESCRIPTION("Mellanox regmap hotplug platform driver"); 813 MODULE_LICENSE("Dual BSD/GPL"); 814 MODULE_ALIAS("platform:mlxreg-hotplug"); 815