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