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