drivers/pci/hotplug/shpchp_ctrl.c

   1 /*
   2  * Standard Hot Plug Controller Driver
   3  *
   4  * Copyright (C) 1995,2001 Compaq Computer Corporation
   5  * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
   6  * Copyright (C) 2001 IBM Corp.
   7  * Copyright (C) 2003-2004 Intel Corporation
   8  *
   9  * All rights reserved.
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or (at
  14  * your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful, but
  17  * WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  19  * NON INFRINGEMENT.  See the GNU General Public License for more
  20  * details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25  *
  26  * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
  27  *
  28  */
  29
  30 #include <linux/module.h>
  31 #include <linux/kernel.h>
  32 #include <linux/types.h>
  33 #include <linux/slab.h>
  34 #include <linux/pci.h>
  35 #include <linux/workqueue.h>
  36 #include "../pci.h"
  37 #include "shpchp.h"
  38
  39 static void interrupt_event_handler(struct work_struct *work);
  40 static int shpchp_enable_slot(struct slot *p_slot);
  41 static int shpchp_disable_slot(struct slot *p_slot);
  42
  43 static int queue_interrupt_event(struct slot *p_slot, u32 event_type)
  44 {
  45         struct event_info *info;
  46
  47         info = kmalloc(sizeof(*info), GFP_ATOMIC);
  48         if (!info)
  49                 return -ENOMEM;
  50
  51         info->event_type = event_type;
  52         info->p_slot = p_slot;
  53         INIT_WORK(&info->work, interrupt_event_handler);
  54
  55         schedule_work(&info->work);
  56
  57         return 0;
  58 }
  59
  60 u8 shpchp_handle_attention_button(u8 hp_slot, struct controller *ctrl)
  61 {
  62         struct slot *p_slot;
  63         u32 event_type;
  64
  65         /* Attention Button Change */
  66         ctrl_dbg(ctrl, "Attention button interrupt received\n");
  67
  68         p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
  69         p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
  70
  71         /*
  72          *  Button pressed - See if need to TAKE ACTION!!!
  73          */
  74         ctrl_info(ctrl, "Button pressed on Slot(%s)\n", slot_name(p_slot));
  75         event_type = INT_BUTTON_PRESS;
  76
  77         queue_interrupt_event(p_slot, event_type);
  78
  79         return 0;
  80
  81 }
  82
  83 u8 shpchp_handle_switch_change(u8 hp_slot, struct controller *ctrl)
  84 {
  85         struct slot *p_slot;
  86         u8 getstatus;
  87         u32 event_type;
  88
  89         /* Switch Change */
  90         ctrl_dbg(ctrl, "Switch interrupt received\n");
  91
  92         p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
  93         p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
  94         p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
  95         ctrl_dbg(ctrl, "Card present %x Power status %x\n",
  96                  p_slot->presence_save, p_slot->pwr_save);
  97
  98         if (getstatus) {
  99                 /*
 100                  * Switch opened
 101                  */
 102                 ctrl_info(ctrl, "Latch open on Slot(%s)\n", slot_name(p_slot));
 103                 event_type = INT_SWITCH_OPEN;
 104                 if (p_slot->pwr_save && p_slot->presence_save) {
 105                         event_type = INT_POWER_FAULT;
 106                         ctrl_err(ctrl, "Surprise Removal of card\n");
 107                 }
 108         } else {
 109                 /*
 110                  *  Switch closed
 111                  */
 112                 ctrl_info(ctrl, "Latch close on Slot(%s)\n", slot_name(p_slot));
 113                 event_type = INT_SWITCH_CLOSE;
 114         }
 115
 116         queue_interrupt_event(p_slot, event_type);
 117
 118         return 1;
 119 }
 120
 121 u8 shpchp_handle_presence_change(u8 hp_slot, struct controller *ctrl)
 122 {
 123         struct slot *p_slot;
 124         u32 event_type;
 125
 126         /* Presence Change */
 127         ctrl_dbg(ctrl, "Presence/Notify input change\n");
 128
 129         p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
 130
 131         /*
 132          * Save the presence state
 133          */
 134         p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
 135         if (p_slot->presence_save) {
 136                 /*
 137                  * Card Present
 138                  */
 139                 ctrl_info(ctrl, "Card present on Slot(%s)\n",
 140                           slot_name(p_slot));
 141                 event_type = INT_PRESENCE_ON;
 142         } else {
 143                 /*
 144                  * Not Present
 145                  */
 146                 ctrl_info(ctrl, "Card not present on Slot(%s)\n",
 147                           slot_name(p_slot));
 148                 event_type = INT_PRESENCE_OFF;
 149         }
 150
 151         queue_interrupt_event(p_slot, event_type);
 152
 153         return 1;
 154 }
 155
 156 u8 shpchp_handle_power_fault(u8 hp_slot, struct controller *ctrl)
 157 {
 158         struct slot *p_slot;
 159         u32 event_type;
 160
 161         /* Power fault */
 162         ctrl_dbg(ctrl, "Power fault interrupt received\n");
 163
 164         p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
 165
 166         if ( !(p_slot->hpc_ops->query_power_fault(p_slot))) {
 167                 /*
 168                  * Power fault Cleared
 169                  */
 170                 ctrl_info(ctrl, "Power fault cleared on Slot(%s)\n",
 171                           slot_name(p_slot));
 172                 p_slot->status = 0x00;
 173                 event_type = INT_POWER_FAULT_CLEAR;
 174         } else {
 175                 /*
 176                  *   Power fault
 177                  */
 178                 ctrl_info(ctrl, "Power fault on Slot(%s)\n", slot_name(p_slot));
 179                 event_type = INT_POWER_FAULT;
 180                 /* set power fault status for this board */
 181                 p_slot->status = 0xFF;
 182                 ctrl_info(ctrl, "Power fault bit %x set\n", hp_slot);
 183         }
 184
 185         queue_interrupt_event(p_slot, event_type);
 186
 187         return 1;
 188 }
 189
 190 /* The following routines constitute the bulk of the
 191    hotplug controller logic
 192  */
 193 static int change_bus_speed(struct controller *ctrl, struct slot *p_slot,
 194                 enum pci_bus_speed speed)
 195 {
 196         int rc = 0;
 197
 198         ctrl_dbg(ctrl, "Change speed to %d\n", speed);
 199         if ((rc = p_slot->hpc_ops->set_bus_speed_mode(p_slot, speed))) {
 200                 ctrl_err(ctrl, "%s: Issue of set bus speed mode command "
 201                          "failed\n", __func__);
 202                 return WRONG_BUS_FREQUENCY;
 203         }
 204         return rc;
 205 }
 206
 207 static int fix_bus_speed(struct controller *ctrl, struct slot *pslot,
 208                 u8 flag, enum pci_bus_speed asp, enum pci_bus_speed bsp,
 209                 enum pci_bus_speed msp)
 210 {
 211         int rc = 0;
 212
 213         /*
 214          * If other slots on the same bus are occupied, we cannot
 215          * change the bus speed.
 216          */
 217         if (flag) {
 218                 if (asp < bsp) {
 219                         ctrl_err(ctrl, "Speed of bus %x and adapter %x "
 220                                  "mismatch\n", bsp, asp);
 221                         rc = WRONG_BUS_FREQUENCY;
 222                 }
 223                 return rc;
 224         }
 225
 226         if (asp < msp) {
 227                 if (bsp != asp)
 228                         rc = change_bus_speed(ctrl, pslot, asp);
 229         } else {
 230                 if (bsp != msp)
 231                         rc = change_bus_speed(ctrl, pslot, msp);
 232         }
 233         return rc;
 234 }
 235
 236 /**
 237  * board_added - Called after a board has been added to the system.
 238  * @p_slot: target &slot
 239  *
 240  * Turns power on for the board.
 241  * Configures board.
 242  */
 243 static int board_added(struct slot *p_slot)
 244 {
 245         u8 hp_slot;
 246         u8 slots_not_empty = 0;
 247         int rc = 0;
 248         enum pci_bus_speed asp, bsp, msp;
 249         struct controller *ctrl = p_slot->ctrl;
 250         struct pci_bus *parent = ctrl->pci_dev->subordinate;
 251
 252         hp_slot = p_slot->device - ctrl->slot_device_offset;
 253
 254         ctrl_dbg(ctrl,
 255                  "%s: p_slot->device, slot_offset, hp_slot = %d, %d ,%d\n",
 256                  __func__, p_slot->device, ctrl->slot_device_offset, hp_slot);
 257
 258         /* Power on slot without connecting to bus */
 259         rc = p_slot->hpc_ops->power_on_slot(p_slot);
 260         if (rc) {
 261                 ctrl_err(ctrl, "Failed to power on slot\n");
 262                 return -1;
 263         }
 264
 265         if ((ctrl->pci_dev->vendor == 0x8086) && (ctrl->pci_dev->device == 0x0332)) {
 266                 if (slots_not_empty)
 267                         return WRONG_BUS_FREQUENCY;
 268
 269                 if ((rc = p_slot->hpc_ops->set_bus_speed_mode(p_slot, PCI_SPEED_33MHz))) {
 270                         ctrl_err(ctrl, "%s: Issue of set bus speed mode command"
 271                                  " failed\n", __func__);
 272                         return WRONG_BUS_FREQUENCY;
 273                 }
 274
 275                 /* turn on board, blink green LED, turn off Amber LED */
 276                 if ((rc = p_slot->hpc_ops->slot_enable(p_slot))) {
 277                         ctrl_err(ctrl, "Issue of Slot Enable command failed\n");
 278                         return rc;
 279                 }
 280         }
 281
 282         rc = p_slot->hpc_ops->get_adapter_speed(p_slot, &asp);
 283         if (rc) {
 284                 ctrl_err(ctrl, "Can't get adapter speed or "
 285                          "bus mode mismatch\n");
 286                 return WRONG_BUS_FREQUENCY;
 287         }
 288
 289         bsp = ctrl->pci_dev->bus->cur_bus_speed;
 290         msp = ctrl->pci_dev->bus->max_bus_speed;
 291
 292         /* Check if there are other slots or devices on the same bus */
 293         if (!list_empty(&ctrl->pci_dev->subordinate->devices))
 294                 slots_not_empty = 1;
 295
 296         ctrl_dbg(ctrl, "%s: slots_not_empty %d, adapter_speed %d, bus_speed %d,"
 297                  " max_bus_speed %d\n", __func__, slots_not_empty, asp,
 298                  bsp, msp);
 299
 300         rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, asp, bsp, msp);
 301         if (rc)
 302                 return rc;
 303
 304         /* turn on board, blink green LED, turn off Amber LED */
 305         if ((rc = p_slot->hpc_ops->slot_enable(p_slot))) {
 306                 ctrl_err(ctrl, "Issue of Slot Enable command failed\n");
 307                 return rc;
 308         }
 309
 310         /* Wait for ~1 second */
 311         msleep(1000);
 312
 313         ctrl_dbg(ctrl, "%s: slot status = %x\n", __func__, p_slot->status);
 314         /* Check for a power fault */
 315         if (p_slot->status == 0xFF) {
 316                 /* power fault occurred, but it was benign */
 317                 ctrl_dbg(ctrl, "%s: Power fault\n", __func__);
 318                 rc = POWER_FAILURE;
 319                 p_slot->status = 0;
 320                 goto err_exit;
 321         }
 322
 323         if (shpchp_configure_device(p_slot)) {
 324                 ctrl_err(ctrl, "Cannot add device at %04x:%02x:%02x\n",
 325                          pci_domain_nr(parent), p_slot->bus, p_slot->device);
 326                 goto err_exit;
 327         }
 328
 329         p_slot->status = 0;
 330         p_slot->is_a_board = 0x01;
 331         p_slot->pwr_save = 1;
 332
 333         p_slot->hpc_ops->green_led_on(p_slot);
 334
 335         return 0;
 336
 337 err_exit:
 338         /* turn off slot, turn on Amber LED, turn off Green LED */
 339         rc = p_slot->hpc_ops->slot_disable(p_slot);
 340         if (rc) {
 341                 ctrl_err(ctrl, "%s: Issue of Slot Disable command failed\n",
 342                          __func__);
 343                 return rc;
 344         }
 345
 346         return(rc);
 347 }
 348
 349
 350 /**
 351  * remove_board - Turns off slot and LEDs
 352  * @p_slot: target &slot
 353  */
 354 static int remove_board(struct slot *p_slot)
 355 {
 356         struct controller *ctrl = p_slot->ctrl;
 357         u8 hp_slot;
 358         int rc;
 359
 360         if (shpchp_unconfigure_device(p_slot))
 361                 return(1);
 362
 363         hp_slot = p_slot->device - ctrl->slot_device_offset;
 364         p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
 365
 366         ctrl_dbg(ctrl, "%s: hp_slot = %d\n", __func__, hp_slot);
 367
 368         /* Change status to shutdown */
 369         if (p_slot->is_a_board)
 370                 p_slot->status = 0x01;
 371
 372         /* turn off slot, turn on Amber LED, turn off Green LED */
 373         rc = p_slot->hpc_ops->slot_disable(p_slot);
 374         if (rc) {
 375                 ctrl_err(ctrl, "%s: Issue of Slot Disable command failed\n",
 376                          __func__);
 377                 return rc;
 378         }
 379
 380         rc = p_slot->hpc_ops->set_attention_status(p_slot, 0);
 381         if (rc) {
 382                 ctrl_err(ctrl, "Issue of Set Attention command failed\n");
 383                 return rc;
 384         }
 385
 386         p_slot->pwr_save = 0;
 387         p_slot->is_a_board = 0;
 388
 389         return 0;
 390 }
 391
 392
 393 struct pushbutton_work_info {
 394         struct slot *p_slot;
 395         struct work_struct work;
 396 };
 397
 398 /**
 399  * shpchp_pushbutton_thread - handle pushbutton events
 400  * @work: &struct work_struct to be handled
 401  *
 402  * Scheduled procedure to handle blocking stuff for the pushbuttons.
 403  * Handles all pending events and exits.
 404  */
 405 static void shpchp_pushbutton_thread(struct work_struct *work)
 406 {
 407         struct pushbutton_work_info *info =
 408                 container_of(work, struct pushbutton_work_info, work);
 409         struct slot *p_slot = info->p_slot;
 410
 411         mutex_lock(&p_slot->lock);
 412         switch (p_slot->state) {
 413         case POWEROFF_STATE:
 414                 mutex_unlock(&p_slot->lock);
 415                 shpchp_disable_slot(p_slot);
 416                 mutex_lock(&p_slot->lock);
 417                 p_slot->state = STATIC_STATE;
 418                 break;
 419         case POWERON_STATE:
 420                 mutex_unlock(&p_slot->lock);
 421                 if (shpchp_enable_slot(p_slot))
 422                         p_slot->hpc_ops->green_led_off(p_slot);
 423                 mutex_lock(&p_slot->lock);
 424                 p_slot->state = STATIC_STATE;
 425                 break;
 426         default:
 427                 break;
 428         }
 429         mutex_unlock(&p_slot->lock);
 430
 431         kfree(info);
 432 }
 433
 434 void shpchp_queue_pushbutton_work(struct work_struct *work)
 435 {
 436         struct slot *p_slot = container_of(work, struct slot, work.work);
 437         struct pushbutton_work_info *info;
 438
 439         info = kmalloc(sizeof(*info), GFP_KERNEL);
 440         if (!info) {
 441                 ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
 442                          __func__);
 443                 return;
 444         }
 445         info->p_slot = p_slot;
 446         INIT_WORK(&info->work, shpchp_pushbutton_thread);
 447
 448         mutex_lock(&p_slot->lock);
 449         switch (p_slot->state) {
 450         case BLINKINGOFF_STATE:
 451                 p_slot->state = POWEROFF_STATE;
 452                 break;
 453         case BLINKINGON_STATE:
 454                 p_slot->state = POWERON_STATE;
 455                 break;
 456         default:
 457                 kfree(info);
 458                 goto out;
 459         }
 460         queue_work(shpchp_wq, &info->work);
 461  out:
 462         mutex_unlock(&p_slot->lock);
 463 }
 464
 465 static int update_slot_info (struct slot *slot)
 466 {
 467         struct hotplug_slot_info *info;
 468         int result;
 469
 470         info = kmalloc(sizeof(*info), GFP_KERNEL);
 471         if (!info)
 472                 return -ENOMEM;
 473
 474         slot->hpc_ops->get_power_status(slot, &(info->power_status));
 475         slot->hpc_ops->get_attention_status(slot, &(info->attention_status));
 476         slot->hpc_ops->get_latch_status(slot, &(info->latch_status));
 477         slot->hpc_ops->get_adapter_status(slot, &(info->adapter_status));
 478
 479         result = pci_hp_change_slot_info(slot->hotplug_slot, info);
 480         kfree (info);
 481         return result;
 482 }
 483
 484 /*
 485  * Note: This function must be called with slot->lock held
 486  */
 487 static void handle_button_press_event(struct slot *p_slot)
 488 {
 489         u8 getstatus;
 490         struct controller *ctrl = p_slot->ctrl;
 491
 492         switch (p_slot->state) {
 493         case STATIC_STATE:
 494                 p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 495                 if (getstatus) {
 496                         p_slot->state = BLINKINGOFF_STATE;
 497                         ctrl_info(ctrl, "PCI slot #%s - powering off due to "
 498                                   "button press.\n", slot_name(p_slot));
 499                 } else {
 500                         p_slot->state = BLINKINGON_STATE;
 501                         ctrl_info(ctrl, "PCI slot #%s - powering on due to "
 502                                   "button press.\n", slot_name(p_slot));
 503                 }
 504                 /* blink green LED and turn off amber */
 505                 p_slot->hpc_ops->green_led_blink(p_slot);
 506                 p_slot->hpc_ops->set_attention_status(p_slot, 0);
 507
 508                 schedule_delayed_work(&p_slot->work, 5*HZ);
 509                 break;
 510         case BLINKINGOFF_STATE:
 511         case BLINKINGON_STATE:
 512                 /*
 513                  * Cancel if we are still blinking; this means that we
 514                  * press the attention again before the 5 sec. limit
 515                  * expires to cancel hot-add or hot-remove
 516                  */
 517                 ctrl_info(ctrl, "Button cancel on Slot(%s)\n",
 518                           slot_name(p_slot));
 519                 cancel_delayed_work(&p_slot->work);
 520                 if (p_slot->state == BLINKINGOFF_STATE)
 521                         p_slot->hpc_ops->green_led_on(p_slot);
 522                 else
 523                         p_slot->hpc_ops->green_led_off(p_slot);
 524                 p_slot->hpc_ops->set_attention_status(p_slot, 0);
 525                 ctrl_info(ctrl, "PCI slot #%s - action canceled due to "
 526                           "button press\n", slot_name(p_slot));
 527                 p_slot->state = STATIC_STATE;
 528                 break;
 529         case POWEROFF_STATE:
 530         case POWERON_STATE:
 531                 /*
 532                  * Ignore if the slot is on power-on or power-off state;
 533                  * this means that the previous attention button action
 534                  * to hot-add or hot-remove is undergoing
 535                  */
 536                 ctrl_info(ctrl, "Button ignore on Slot(%s)\n",
 537                           slot_name(p_slot));
 538                 update_slot_info(p_slot);
 539                 break;
 540         default:
 541                 ctrl_warn(ctrl, "Not a valid state\n");
 542                 break;
 543         }
 544 }
 545
 546 static void interrupt_event_handler(struct work_struct *work)
 547 {
 548         struct event_info *info = container_of(work, struct event_info, work);
 549         struct slot *p_slot = info->p_slot;
 550
 551         mutex_lock(&p_slot->lock);
 552         switch (info->event_type) {
 553         case INT_BUTTON_PRESS:
 554                 handle_button_press_event(p_slot);
 555                 break;
 556         case INT_POWER_FAULT:
 557                 ctrl_dbg(p_slot->ctrl, "%s: Power fault\n", __func__);
 558                 p_slot->hpc_ops->set_attention_status(p_slot, 1);
 559                 p_slot->hpc_ops->green_led_off(p_slot);
 560                 break;
 561         default:
 562                 update_slot_info(p_slot);
 563                 break;
 564         }
 565         mutex_unlock(&p_slot->lock);
 566
 567         kfree(info);
 568 }
 569
 570
 571 static int shpchp_enable_slot (struct slot *p_slot)
 572 {
 573         u8 getstatus = 0;
 574         int rc, retval = -ENODEV;
 575         struct controller *ctrl = p_slot->ctrl;
 576
 577         /* Check to see if (latch closed, card present, power off) */
 578         mutex_lock(&p_slot->ctrl->crit_sect);
 579         rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
 580         if (rc || !getstatus) {
 581                 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
 582                 goto out;
 583         }
 584         rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 585         if (rc || getstatus) {
 586                 ctrl_info(ctrl, "Latch open on slot(%s)\n", slot_name(p_slot));
 587                 goto out;
 588         }
 589         rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 590         if (rc || getstatus) {
 591                 ctrl_info(ctrl, "Already enabled on slot(%s)\n",
 592                           slot_name(p_slot));
 593                 goto out;
 594         }
 595
 596         p_slot->is_a_board = 1;
 597
 598         /* We have to save the presence info for these slots */
 599         p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
 600         p_slot->hpc_ops->get_power_status(p_slot, &(p_slot->pwr_save));
 601         ctrl_dbg(ctrl, "%s: p_slot->pwr_save %x\n", __func__, p_slot->pwr_save);
 602         p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 603
 604         if(((p_slot->ctrl->pci_dev->vendor == PCI_VENDOR_ID_AMD) ||
 605             (p_slot->ctrl->pci_dev->device == PCI_DEVICE_ID_AMD_POGO_7458))
 606              && p_slot->ctrl->num_slots == 1) {
 607                 /* handle amd pogo errata; this must be done before enable  */
 608                 amd_pogo_errata_save_misc_reg(p_slot);
 609                 retval = board_added(p_slot);
 610                 /* handle amd pogo errata; this must be done after enable  */
 611                 amd_pogo_errata_restore_misc_reg(p_slot);
 612         } else
 613                 retval = board_added(p_slot);
 614
 615         if (retval) {
 616                 p_slot->hpc_ops->get_adapter_status(p_slot,
 617                                 &(p_slot->presence_save));
 618                 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 619         }
 620
 621         update_slot_info(p_slot);
 622  out:
 623         mutex_unlock(&p_slot->ctrl->crit_sect);
 624         return retval;
 625 }
 626
 627
 628 static int shpchp_disable_slot (struct slot *p_slot)
 629 {
 630         u8 getstatus = 0;
 631         int rc, retval = -ENODEV;
 632         struct controller *ctrl = p_slot->ctrl;
 633
 634         if (!p_slot->ctrl)
 635                 return -ENODEV;
 636
 637         /* Check to see if (latch closed, card present, power on) */
 638         mutex_lock(&p_slot->ctrl->crit_sect);
 639
 640         rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
 641         if (rc || !getstatus) {
 642                 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
 643                 goto out;
 644         }
 645         rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 646         if (rc || getstatus) {
 647                 ctrl_info(ctrl, "Latch open on slot(%s)\n", slot_name(p_slot));
 648                 goto out;
 649         }
 650         rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 651         if (rc || !getstatus) {
 652                 ctrl_info(ctrl, "Already disabled on slot(%s)\n",
 653                           slot_name(p_slot));
 654                 goto out;
 655         }
 656
 657         retval = remove_board(p_slot);
 658         update_slot_info(p_slot);
 659  out:
 660         mutex_unlock(&p_slot->ctrl->crit_sect);
 661         return retval;
 662 }
 663
 664 int shpchp_sysfs_enable_slot(struct slot *p_slot)
 665 {
 666         int retval = -ENODEV;
 667         struct controller *ctrl = p_slot->ctrl;
 668
 669         mutex_lock(&p_slot->lock);
 670         switch (p_slot->state) {
 671         case BLINKINGON_STATE:
 672                 cancel_delayed_work(&p_slot->work);
 673         case STATIC_STATE:
 674                 p_slot->state = POWERON_STATE;
 675                 mutex_unlock(&p_slot->lock);
 676                 retval = shpchp_enable_slot(p_slot);
 677                 mutex_lock(&p_slot->lock);
 678                 p_slot->state = STATIC_STATE;
 679                 break;
 680         case POWERON_STATE:
 681                 ctrl_info(ctrl, "Slot %s is already in powering on state\n",
 682                           slot_name(p_slot));
 683                 break;
 684         case BLINKINGOFF_STATE:
 685         case POWEROFF_STATE:
 686                 ctrl_info(ctrl, "Already enabled on slot %s\n",
 687                           slot_name(p_slot));
 688                 break;
 689         default:
 690                 ctrl_err(ctrl, "Not a valid state on slot %s\n",
 691                          slot_name(p_slot));
 692                 break;
 693         }
 694         mutex_unlock(&p_slot->lock);
 695
 696         return retval;
 697 }
 698
 699 int shpchp_sysfs_disable_slot(struct slot *p_slot)
 700 {
 701         int retval = -ENODEV;
 702         struct controller *ctrl = p_slot->ctrl;
 703
 704         mutex_lock(&p_slot->lock);
 705         switch (p_slot->state) {
 706         case BLINKINGOFF_STATE:
 707                 cancel_delayed_work(&p_slot->work);
 708         case STATIC_STATE:
 709                 p_slot->state = POWEROFF_STATE;
 710                 mutex_unlock(&p_slot->lock);
 711                 retval = shpchp_disable_slot(p_slot);
 712                 mutex_lock(&p_slot->lock);
 713                 p_slot->state = STATIC_STATE;
 714                 break;
 715         case POWEROFF_STATE:
 716                 ctrl_info(ctrl, "Slot %s is already in powering off state\n",
 717                           slot_name(p_slot));
 718                 break;
 719         case BLINKINGON_STATE:
 720         case POWERON_STATE:
 721                 ctrl_info(ctrl, "Already disabled on slot %s\n",
 722                           slot_name(p_slot));
 723                 break;
 724         default:
 725                 ctrl_err(ctrl, "Not a valid state on slot %s\n",
 726                          slot_name(p_slot));
 727                 break;
 728         }
 729         mutex_unlock(&p_slot->lock);
 730
 731         return retval;
 732 }