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  *
  11  * All rights reserved.
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or (at
  16  * your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful, but
  19  * WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  21  * NON INFRINGEMENT.  See the GNU General Public License for more
  22  * details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  27  *
  28  * Send feedback to <gregkh@us.ibm.com>,
  29  *                  <t-kochi@bq.jp.nec.com>
  30  *
  31  */
  32
  33 #include <linux/init.h>
  34 #include <linux/module.h>
  35 #include <linux/moduleparam.h>
  36
  37 #include <linux/kernel.h>
  38 #include <linux/pci.h>
  39 #include <linux/slab.h>
  40 #include <linux/smp.h>
  41 #include <linux/smp_lock.h>
  42 #include "pci_hotplug.h"
  43 #include "acpiphp.h"
  44
  45 static LIST_HEAD(slot_list);
  46
  47 #define MY_NAME "acpiphp"
  48
  49 static int debug;
  50 int acpiphp_debug;
  51
  52 /* local variables */
  53 static int num_slots;
  54 static struct acpiphp_attention_info *attention_info;
  55
  56 #define DRIVER_VERSION  "0.4"
  57 #define DRIVER_AUTHOR   "Greg Kroah-Hartman <gregkh@us.ibm.com>, Takayoshi Kochi <t-kochi@bq.jp.nec.com>"
  58 #define DRIVER_DESC     "ACPI Hot Plug PCI Controller Driver"
  59
  60 MODULE_AUTHOR(DRIVER_AUTHOR);
  61 MODULE_DESCRIPTION(DRIVER_DESC);
  62 MODULE_LICENSE("GPL");
  63 MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
  64 module_param(debug, bool, 0644);
  65
  66 /* export the attention callback registration methods */
  67 EXPORT_SYMBOL_GPL(acpiphp_register_attention);
  68 EXPORT_SYMBOL_GPL(acpiphp_unregister_attention);
  69
  70 static int enable_slot          (struct hotplug_slot *slot);
  71 static int disable_slot         (struct hotplug_slot *slot);
  72 static int set_attention_status (struct hotplug_slot *slot, u8 value);
  73 static int get_power_status     (struct hotplug_slot *slot, u8 *value);
  74 static int get_attention_status (struct hotplug_slot *slot, u8 *value);
  75 static int get_address          (struct hotplug_slot *slot, u32 *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         .get_address            = get_address,
  89 };
  90
  91
  92 /**
  93  * acpiphp_register_attention - set attention LED callback
  94  * @info: must be completely filled with LED callbacks
  95  *
  96  * Description: this is used to register a hardware specific ACPI
  97  * driver that manipulates the attention LED.  All the fields in
  98  * info must be set.
  99  **/
 100 int acpiphp_register_attention(struct acpiphp_attention_info *info)
 101 {
 102         int retval = -EINVAL;
 103
 104         if (info && info->owner && info->set_attn &&
 105                         info->get_attn && !attention_info) {
 106                 retval = 0;
 107                 attention_info = info;
 108         }
 109         return retval;
 110 }
 111
 112
 113 /**
 114  * acpiphp_unregister_attention - unset attention LED callback
 115  * @info: must match the pointer used to register
 116  *
 117  * Description: this is used to un-register a hardware specific acpi
 118  * driver that manipulates the attention LED.  The pointer to the
 119  * info struct must be the same as the one used to set it.
 120  **/
 121 int acpiphp_unregister_attention(struct acpiphp_attention_info *info)
 122 {
 123         int retval = -EINVAL;
 124
 125         if (info && attention_info == info) {
 126                 attention_info = NULL;
 127                 retval = 0;
 128         }
 129         return retval;
 130 }
 131
 132
 133 /**
 134  * enable_slot - power on and enable a slot
 135  * @hotplug_slot: slot to enable
 136  *
 137  * Actual tasks are done in acpiphp_enable_slot()
 138  *
 139  */
 140 static int enable_slot(struct hotplug_slot *hotplug_slot)
 141 {
 142         struct slot *slot = hotplug_slot->private;
 143
 144         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 145
 146         /* enable the specified slot */
 147         return acpiphp_enable_slot(slot->acpi_slot);
 148 }
 149
 150
 151 /**
 152  * disable_slot - disable and power off a slot
 153  * @hotplug_slot: slot to disable
 154  *
 155  * Actual tasks are done in acpiphp_disable_slot()
 156  *
 157  */
 158 static int disable_slot(struct hotplug_slot *hotplug_slot)
 159 {
 160         struct slot *slot = hotplug_slot->private;
 161
 162         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 163
 164         /* disable the specified slot */
 165         return acpiphp_disable_slot(slot->acpi_slot);
 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", __FUNCTION__, hotplug_slot->name);
 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  */
 202 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
 203 {
 204         struct slot *slot = hotplug_slot->private;
 205
 206         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 207
 208         *value = acpiphp_get_power_status(slot->acpi_slot);
 209
 210         return 0;
 211 }
 212
 213
 214  /**
 215  * get_attention_status - get attention LED status
 216  * @hotplug_slot: slot to get status from
 217  * @value: returns with value of attention LED
 218  *
 219  * ACPI doesn't have known method to determine the state
 220  * of the attention status LED, so we use a callback that
 221  * was registered with us.  This allows hardware specific
 222  * ACPI implementations to determine its state
 223  **/
 224 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
 225 {
 226         int retval = -EINVAL;
 227
 228         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 229
 230         if (attention_info && try_module_get(attention_info->owner)) {
 231                 retval = attention_info->get_attn(hotplug_slot, value);
 232                 module_put(attention_info->owner);
 233         } else
 234                 attention_info = NULL;
 235         return retval;
 236 }
 237
 238
 239 /**
 240  * get_latch_status - get latch status of a slot
 241  * @hotplug_slot: slot to get status
 242  * @value: pointer to store status
 243  *
 244  * ACPI doesn't provide any formal means to access latch status.
 245  * Instead, we fake latch status from _STA
 246  *
 247  */
 248 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
 249 {
 250         struct slot *slot = hotplug_slot->private;
 251
 252         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 253
 254         *value = acpiphp_get_latch_status(slot->acpi_slot);
 255
 256         return 0;
 257 }
 258
 259
 260 /**
 261  * get_adapter_status - get adapter status of a slot
 262  * @hotplug_slot: slot to get status
 263  * @value: pointer to store status
 264  *
 265  * ACPI doesn't provide any formal means to access adapter status.
 266  * Instead, we fake adapter status from _STA
 267  *
 268  */
 269 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
 270 {
 271         struct slot *slot = hotplug_slot->private;
 272
 273         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 274
 275         *value = acpiphp_get_adapter_status(slot->acpi_slot);
 276
 277         return 0;
 278 }
 279
 280
 281 /**
 282  * get_address - get pci address of a slot
 283  * @hotplug_slot: slot to get status
 284  * @busdev: pointer to struct pci_busdev (seg, bus, dev)
 285  *
 286  */
 287 static int get_address(struct hotplug_slot *hotplug_slot, u32 *value)
 288 {
 289         struct slot *slot = hotplug_slot->private;
 290
 291         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 292
 293         *value = acpiphp_get_address(slot->acpi_slot);
 294
 295         return 0;
 296 }
 297
 298 static int __init init_acpi(void)
 299 {
 300         int retval;
 301
 302         /* initialize internal data structure etc. */
 303         retval = acpiphp_glue_init();
 304
 305         /* read initial number of slots */
 306         if (!retval) {
 307                 num_slots = acpiphp_get_num_slots();
 308                 if (num_slots == 0)
 309                         retval = -ENODEV;
 310         }
 311
 312         return retval;
 313 }
 314
 315
 316 /**
 317  * make_slot_name - make a slot name that appears in pcihpfs
 318  * @slot: slot to name
 319  *
 320  */
 321 static void make_slot_name(struct slot *slot)
 322 {
 323         snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%u",
 324                  slot->acpi_slot->sun);
 325 }
 326
 327 /**
 328  * release_slot - free up the memory used by a slot
 329  * @hotplug_slot: slot to free
 330  */
 331 static void release_slot(struct hotplug_slot *hotplug_slot)
 332 {
 333         struct slot *slot = hotplug_slot->private;
 334
 335         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 336
 337         kfree(slot->hotplug_slot->info);
 338         kfree(slot->hotplug_slot->name);
 339         kfree(slot->hotplug_slot);
 340         kfree(slot);
 341 }
 342
 343 /**
 344  * init_slots - initialize 'struct slot' structures for each slot
 345  *
 346  */
 347 static int __init init_slots(void)
 348 {
 349         struct slot *slot;
 350         int retval = -ENOMEM;
 351         int i;
 352
 353         for (i = 0; i < num_slots; ++i) {
 354                 slot = kmalloc(sizeof(struct slot), GFP_KERNEL);
 355                 if (!slot)
 356                         goto error;
 357                 memset(slot, 0, sizeof(struct slot));
 358
 359                 slot->hotplug_slot = kmalloc(sizeof(struct hotplug_slot), GFP_KERNEL);
 360                 if (!slot->hotplug_slot)
 361                         goto error_slot;
 362                 memset(slot->hotplug_slot, 0, sizeof(struct hotplug_slot));
 363
 364                 slot->hotplug_slot->info = kmalloc(sizeof(struct hotplug_slot_info), GFP_KERNEL);
 365                 if (!slot->hotplug_slot->info)
 366                         goto error_hpslot;
 367                 memset(slot->hotplug_slot->info, 0, sizeof(struct hotplug_slot_info));
 368
 369                 slot->hotplug_slot->name = kmalloc(SLOT_NAME_SIZE, GFP_KERNEL);
 370                 if (!slot->hotplug_slot->name)
 371                         goto error_info;
 372
 373                 slot->number = i;
 374
 375                 slot->hotplug_slot->private = slot;
 376                 slot->hotplug_slot->release = &release_slot;
 377                 slot->hotplug_slot->ops = &acpi_hotplug_slot_ops;
 378
 379                 slot->acpi_slot = get_slot_from_id(i);
 380                 slot->hotplug_slot->info->power_status = acpiphp_get_power_status(slot->acpi_slot);
 381                 slot->hotplug_slot->info->attention_status = 0;
 382                 slot->hotplug_slot->info->latch_status = acpiphp_get_latch_status(slot->acpi_slot);
 383                 slot->hotplug_slot->info->adapter_status = acpiphp_get_adapter_status(slot->acpi_slot);
 384                 slot->hotplug_slot->info->max_bus_speed = PCI_SPEED_UNKNOWN;
 385                 slot->hotplug_slot->info->cur_bus_speed = PCI_SPEED_UNKNOWN;
 386
 387                 make_slot_name(slot);
 388
 389                 retval = pci_hp_register(slot->hotplug_slot);
 390                 if (retval) {
 391                         err("pci_hp_register failed with error %d\n", retval);
 392                         goto error_name;
 393                 }
 394
 395                 /* add slot to our internal list */
 396                 list_add(&slot->slot_list, &slot_list);
 397                 info("Slot [%s] registered\n", slot->hotplug_slot->name);
 398         }
 399
 400         return 0;
 401 error_name:
 402         kfree(slot->hotplug_slot->name);
 403 error_info:
 404         kfree(slot->hotplug_slot->info);
 405 error_hpslot:
 406         kfree(slot->hotplug_slot);
 407 error_slot:
 408         kfree(slot);
 409 error:
 410         return retval;
 411 }
 412
 413
 414 static void __exit cleanup_slots (void)
 415 {
 416         struct list_head *tmp, *n;
 417         struct slot *slot;
 418
 419         list_for_each_safe (tmp, n, &slot_list) {
 420                 /* memory will be freed in release_slot callback */
 421                 slot = list_entry(tmp, struct slot, slot_list);
 422                 list_del(&slot->slot_list);
 423                 pci_hp_deregister(slot->hotplug_slot);
 424         }
 425 }
 426
 427
 428 static int __init acpiphp_init(void)
 429 {
 430         int retval;
 431
 432         info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
 433
 434         acpiphp_debug = debug;
 435
 436         /* read all the ACPI info from the system */
 437         retval = init_acpi();
 438         if (retval)
 439                 return retval;
 440
 441         return init_slots();
 442 }
 443
 444
 445 static void __exit acpiphp_exit(void)
 446 {
 447         cleanup_slots();
 448         /* deallocate internal data structures etc. */
 449         acpiphp_glue_exit();
 450 }
 451
 452 module_init(acpiphp_init);
 453 module_exit(acpiphp_exit);