drivers/pci/hotplug/acpiphp_core.c

   1 /*
   2  * ACPI PCI 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) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com)
   8  * Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com)
   9  * Copyright (C) 2002,2003 NEC Corporation
  10  * Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com)
  11  * Copyright (C) 2003-2005 Hewlett Packard
  12  *
  13  * All rights reserved.
  14  *
  15  * This program is free software; you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License as published by
  17  * the Free Software Foundation; either version 2 of the License, or (at
  18  * your option) any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful, but
  21  * WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  23  * NON INFRINGEMENT.  See the GNU General Public License for more
  24  * details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, write to the Free Software
  28  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  29  *
  30  * Send feedback to <kristen.c.accardi@intel.com>
  31  *
  32  */
  33
  34 #include <linux/init.h>
  35 #include <linux/module.h>
  36 #include <linux/moduleparam.h>
  37
  38 #include <linux/kernel.h>
  39 #include <linux/pci.h>
  40 #include <linux/pci_hotplug.h>
  41 #include <linux/slab.h>
  42 #include <linux/smp.h>
  43 #include "acpiphp.h"
  44
  45 #define MY_NAME "acpiphp"
  46
  47 /* name size which is used for entries in pcihpfs */
  48 #define SLOT_NAME_SIZE  21              /* {_SUN} */
  49
  50 static int debug;
  51 int acpiphp_debug;
  52
  53 /* local variables */
  54 static int num_slots;
  55 static struct acpiphp_attention_info *attention_info;
  56
  57 #define DRIVER_VERSION  "0.5"
  58 #define DRIVER_AUTHOR   "Greg Kroah-Hartman <gregkh@us.ibm.com>, Takayoshi Kochi <t-kochi@bq.jp.nec.com>, Matthew Wilcox <willy@hp.com>"
  59 #define DRIVER_DESC     "ACPI Hot Plug PCI Controller Driver"
  60
  61 MODULE_AUTHOR(DRIVER_AUTHOR);
  62 MODULE_DESCRIPTION(DRIVER_DESC);
  63 MODULE_LICENSE("GPL");
  64 MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
  65 module_param(debug, bool, 0644);
  66
  67 /* export the attention callback registration methods */
  68 EXPORT_SYMBOL_GPL(acpiphp_register_attention);
  69 EXPORT_SYMBOL_GPL(acpiphp_unregister_attention);
  70
  71 static int enable_slot          (struct hotplug_slot *slot);
  72 static int disable_slot         (struct hotplug_slot *slot);
  73 static int set_attention_status (struct hotplug_slot *slot, u8 value);
  74 static int get_power_status     (struct hotplug_slot *slot, u8 *value);
  75 static int get_attention_status (struct hotplug_slot *slot, u8 *value);
  76 static int get_latch_status     (struct hotplug_slot *slot, u8 *value);
  77 static int get_adapter_status   (struct hotplug_slot *slot, u8 *value);
  78
  79 static struct hotplug_slot_ops acpi_hotplug_slot_ops = {
  80         .owner                  = THIS_MODULE,
  81         .enable_slot            = enable_slot,
  82         .disable_slot           = disable_slot,
  83         .set_attention_status   = set_attention_status,
  84         .get_power_status       = get_power_status,
  85         .get_attention_status   = get_attention_status,
  86         .get_latch_status       = get_latch_status,
  87         .get_adapter_status     = get_adapter_status,
  88 };
  89
  90 /**
  91  * acpiphp_register_attention - set attention LED callback
  92  * @info: must be completely filled with LED callbacks
  93  *
  94  * Description: This is used to register a hardware specific ACPI
  95  * driver that manipulates the attention LED.  All the fields in
  96  * info must be set.
  97  */
  98 int acpiphp_register_attention(struct acpiphp_attention_info *info)
  99 {
 100         int retval = -EINVAL;
 101
 102         if (info && info->owner && info->set_attn &&
 103                         info->get_attn && !attention_info) {
 104                 retval = 0;
 105                 attention_info = info;
 106         }
 107         return retval;
 108 }
 109
 110
 111 /**
 112  * acpiphp_unregister_attention - unset attention LED callback
 113  * @info: must match the pointer used to register
 114  *
 115  * Description: This is used to un-register a hardware specific acpi
 116  * driver that manipulates the attention LED.  The pointer to the
 117  * info struct must be the same as the one used to set it.
 118  */
 119 int acpiphp_unregister_attention(struct acpiphp_attention_info *info)
 120 {
 121         int retval = -EINVAL;
 122
 123         if (info && attention_info == info) {
 124                 attention_info = NULL;
 125                 retval = 0;
 126         }
 127         return retval;
 128 }
 129
 130
 131 /**
 132  * enable_slot - power on and enable a slot
 133  * @hotplug_slot: slot to enable
 134  *
 135  * Actual tasks are done in acpiphp_enable_slot()
 136  */
 137 static int enable_slot(struct hotplug_slot *hotplug_slot)
 138 {
 139         struct slot *slot = hotplug_slot->private;
 140
 141         dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
 142
 143         /* enable the specified slot */
 144         return acpiphp_enable_slot(slot->acpi_slot);
 145 }
 146
 147
 148 /**
 149  * disable_slot - disable and power off a slot
 150  * @hotplug_slot: slot to disable
 151  *
 152  * Actual tasks are done in acpiphp_disable_slot()
 153  */
 154 static int disable_slot(struct hotplug_slot *hotplug_slot)
 155 {
 156         struct slot *slot = hotplug_slot->private;
 157         int retval;
 158
 159         dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
 160
 161         /* disable the specified slot */
 162         retval = acpiphp_disable_slot(slot->acpi_slot);
 163         if (!retval)
 164                 retval = acpiphp_eject_slot(slot->acpi_slot);
 165         return retval;
 166 }
 167
 168
 169 /**
 170  * set_attention_status - set attention LED
 171  * @hotplug_slot: slot to set attention LED on
 172  * @status: value to set attention LED to (0 or 1)
 173  *
 174  * attention status LED, so we use a callback that
 175  * was registered with us.  This allows hardware specific
 176  * ACPI implementations to blink the light for us.
 177  */
 178  static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
 179  {
 180         int retval = -ENODEV;
 181
 182         dbg("%s - physical_slot = %s\n", __func__, hotplug_slot_name(hotplug_slot));
 183
 184         if (attention_info && try_module_get(attention_info->owner)) {
 185                 retval = attention_info->set_attn(hotplug_slot, status);
 186                 module_put(attention_info->owner);
 187         } else
 188                 attention_info = NULL;
 189         return retval;
 190  }
 191
 192
 193 /**
 194  * get_power_status - get power status of a slot
 195  * @hotplug_slot: slot to get status
 196  * @value: pointer to store status
 197  *
 198  * Some platforms may not implement _STA method properly.
 199  * In that case, the value returned may not be reliable.
 200  */
 201 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
 202 {
 203         struct slot *slot = hotplug_slot->private;
 204
 205         dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
 206
 207         *value = acpiphp_get_power_status(slot->acpi_slot);
 208
 209         return 0;
 210 }
 211
 212
 213 /**
 214  * get_attention_status - get attention LED status
 215  * @hotplug_slot: slot to get status from
 216  * @value: returns with value of attention LED
 217  *
 218  * ACPI doesn't have known method to determine the state
 219  * of the attention status LED, so we use a callback that
 220  * was registered with us.  This allows hardware specific
 221  * ACPI implementations to determine its state.
 222  */
 223 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
 224 {
 225         int retval = -EINVAL;
 226
 227         dbg("%s - physical_slot = %s\n", __func__, hotplug_slot_name(hotplug_slot));
 228
 229         if (attention_info && try_module_get(attention_info->owner)) {
 230                 retval = attention_info->get_attn(hotplug_slot, value);
 231                 module_put(attention_info->owner);
 232         } else
 233                 attention_info = NULL;
 234         return retval;
 235 }
 236
 237
 238 /**
 239  * get_latch_status - get latch status of a slot
 240  * @hotplug_slot: slot to get status
 241  * @value: pointer to store status
 242  *
 243  * ACPI doesn't provide any formal means to access latch status.
 244  * Instead, we fake latch status from _STA.
 245  */
 246 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
 247 {
 248         struct slot *slot = hotplug_slot->private;
 249
 250         dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
 251
 252         *value = acpiphp_get_latch_status(slot->acpi_slot);
 253
 254         return 0;
 255 }
 256
 257
 258 /**
 259  * get_adapter_status - get adapter status of a slot
 260  * @hotplug_slot: slot to get status
 261  * @value: pointer to store status
 262  *
 263  * ACPI doesn't provide any formal means to access adapter status.
 264  * Instead, we fake adapter status from _STA.
 265  */
 266 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
 267 {
 268         struct slot *slot = hotplug_slot->private;
 269
 270         dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
 271
 272         *value = acpiphp_get_adapter_status(slot->acpi_slot);
 273
 274         return 0;
 275 }
 276
 277 static int __init init_acpi(void)
 278 {
 279         int retval;
 280
 281         /* initialize internal data structure etc. */
 282         retval = acpiphp_glue_init();
 283
 284         /* read initial number of slots */
 285         if (!retval) {
 286                 num_slots = acpiphp_get_num_slots();
 287                 if (num_slots == 0) {
 288                         acpiphp_glue_exit();
 289                         retval = -ENODEV;
 290                 }
 291         }
 292
 293         return retval;
 294 }
 295
 296 /**
 297  * release_slot - free up the memory used by a slot
 298  * @hotplug_slot: slot to free
 299  */
 300 static void release_slot(struct hotplug_slot *hotplug_slot)
 301 {
 302         struct slot *slot = hotplug_slot->private;
 303
 304         dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
 305
 306         kfree(slot->hotplug_slot);
 307         kfree(slot);
 308 }
 309
 310 /* callback routine to initialize 'struct slot' for each slot */
 311 int acpiphp_register_hotplug_slot(struct acpiphp_slot *acpiphp_slot)
 312 {
 313         struct slot *slot;
 314         int retval = -ENOMEM;
 315         char name[SLOT_NAME_SIZE];
 316
 317         slot = kzalloc(sizeof(*slot), GFP_KERNEL);
 318         if (!slot)
 319                 goto error;
 320
 321         slot->hotplug_slot = kzalloc(sizeof(*slot->hotplug_slot), GFP_KERNEL);
 322         if (!slot->hotplug_slot)
 323                 goto error_slot;
 324
 325         slot->hotplug_slot->info = &slot->info;
 326
 327         slot->hotplug_slot->private = slot;
 328         slot->hotplug_slot->release = &release_slot;
 329         slot->hotplug_slot->ops = &acpi_hotplug_slot_ops;
 330
 331         slot->acpi_slot = acpiphp_slot;
 332         slot->hotplug_slot->info->power_status = acpiphp_get_power_status(slot->acpi_slot);
 333         slot->hotplug_slot->info->attention_status = 0;
 334         slot->hotplug_slot->info->latch_status = acpiphp_get_latch_status(slot->acpi_slot);
 335         slot->hotplug_slot->info->adapter_status = acpiphp_get_adapter_status(slot->acpi_slot);
 336         slot->hotplug_slot->info->max_bus_speed = PCI_SPEED_UNKNOWN;
 337         slot->hotplug_slot->info->cur_bus_speed = PCI_SPEED_UNKNOWN;
 338
 339         acpiphp_slot->slot = slot;
 340         snprintf(name, SLOT_NAME_SIZE, "%llu", slot->acpi_slot->sun);
 341
 342         retval = pci_hp_register(slot->hotplug_slot,
 343                                         acpiphp_slot->bridge->pci_bus,
 344                                         acpiphp_slot->device,
 345                                         name);
 346         if (retval == -EBUSY)
 347                 goto error_hpslot;
 348         if (retval) {
 349                 err("pci_hp_register failed with error %d\n", retval);
 350                 goto error_hpslot;
 351         }
 352
 353         info("Slot [%s] registered\n", slot_name(slot));
 354
 355         return 0;
 356 error_hpslot:
 357         kfree(slot->hotplug_slot);
 358 error_slot:
 359         kfree(slot);
 360 error:
 361         return retval;
 362 }
 363
 364
 365 void acpiphp_unregister_hotplug_slot(struct acpiphp_slot *acpiphp_slot)
 366 {
 367         struct slot *slot = acpiphp_slot->slot;
 368         int retval = 0;
 369
 370         info("Slot [%s] unregistered\n", slot_name(slot));
 371
 372         retval = pci_hp_deregister(slot->hotplug_slot);
 373         if (retval)
 374                 err("pci_hp_deregister failed with error %d\n", retval);
 375 }
 376
 377
 378 static int __init acpiphp_init(void)
 379 {
 380         info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
 381
 382         if (acpi_pci_disabled)
 383                 return 0;
 384
 385         acpiphp_debug = debug;
 386
 387         /* read all the ACPI info from the system */
 388         return init_acpi();
 389 }
 390
 391
 392 static void __exit acpiphp_exit(void)
 393 {
 394         if (acpi_pci_disabled)
 395                 return;
 396
 397         /* deallocate internal data structures etc. */
 398         acpiphp_glue_exit();
 399 }
 400
 401 module_init(acpiphp_init);
 402 module_exit(acpiphp_exit);