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 static int debug;
  48 int acpiphp_debug;
  49
  50 /* local variables */
  51 static int num_slots;
  52 static struct acpiphp_attention_info *attention_info;
  53
  54 #define DRIVER_VERSION  "0.5"
  55 #define DRIVER_AUTHOR   "Greg Kroah-Hartman <gregkh@us.ibm.com>, Takayoshi Kochi <t-kochi@bq.jp.nec.com>, Matthew Wilcox <willy@hp.com>"
  56 #define DRIVER_DESC     "ACPI Hot Plug PCI Controller Driver"
  57
  58 MODULE_AUTHOR(DRIVER_AUTHOR);
  59 MODULE_DESCRIPTION(DRIVER_DESC);
  60 MODULE_LICENSE("GPL");
  61 MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
  62 module_param(debug, bool, 0644);
  63
  64 /* export the attention callback registration methods */
  65 EXPORT_SYMBOL_GPL(acpiphp_register_attention);
  66 EXPORT_SYMBOL_GPL(acpiphp_unregister_attention);
  67
  68 static int enable_slot          (struct hotplug_slot *slot);
  69 static int disable_slot         (struct hotplug_slot *slot);
  70 static int set_attention_status (struct hotplug_slot *slot, u8 value);
  71 static int get_power_status     (struct hotplug_slot *slot, u8 *value);
  72 static int get_attention_status (struct hotplug_slot *slot, u8 *value);
  73 static int get_address          (struct hotplug_slot *slot, u32 *value);
  74 static int get_latch_status     (struct hotplug_slot *slot, u8 *value);
  75 static int get_adapter_status   (struct hotplug_slot *slot, u8 *value);
  76
  77 static struct hotplug_slot_ops acpi_hotplug_slot_ops = {
  78         .owner                  = THIS_MODULE,
  79         .enable_slot            = enable_slot,
  80         .disable_slot           = disable_slot,
  81         .set_attention_status   = set_attention_status,
  82         .get_power_status       = get_power_status,
  83         .get_attention_status   = get_attention_status,
  84         .get_latch_status       = get_latch_status,
  85         .get_adapter_status     = get_adapter_status,
  86         .get_address            = get_address,
  87 };
  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", __FUNCTION__, hotplug_slot->name);
 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", __FUNCTION__, hotplug_slot->name);
 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", __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 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", __FUNCTION__, hotplug_slot->name);
 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", __FUNCTION__, hotplug_slot->name);
 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", __FUNCTION__, hotplug_slot->name);
 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", __FUNCTION__, hotplug_slot->name);
 271
 272         *value = acpiphp_get_adapter_status(slot->acpi_slot);
 273
 274         return 0;
 275 }
 276
 277
 278 /**
 279  * get_address - get pci address of a slot
 280  * @hotplug_slot: slot to get status
 281  * @value: pointer to struct pci_busdev (seg, bus, dev)
 282  */
 283 static int get_address(struct hotplug_slot *hotplug_slot, u32 *value)
 284 {
 285         struct slot *slot = hotplug_slot->private;
 286
 287         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 288
 289         *value = acpiphp_get_address(slot->acpi_slot);
 290
 291         return 0;
 292 }
 293
 294 static int __init init_acpi(void)
 295 {
 296         int retval;
 297
 298         /* initialize internal data structure etc. */
 299         retval = acpiphp_glue_init();
 300
 301         /* read initial number of slots */
 302         if (!retval) {
 303                 num_slots = acpiphp_get_num_slots();
 304                 if (num_slots == 0) {
 305                         acpiphp_glue_exit();
 306                         retval = -ENODEV;
 307                 }
 308         }
 309
 310         return retval;
 311 }
 312
 313 /**
 314  * release_slot - free up the memory used by a slot
 315  * @hotplug_slot: slot to free
 316  */
 317 static void release_slot(struct hotplug_slot *hotplug_slot)
 318 {
 319         struct slot *slot = hotplug_slot->private;
 320
 321         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 322
 323         kfree(slot->hotplug_slot);
 324         kfree(slot);
 325 }
 326
 327 /* callback routine to initialize 'struct slot' for each slot */
 328 int acpiphp_register_hotplug_slot(struct acpiphp_slot *acpiphp_slot)
 329 {
 330         struct slot *slot;
 331         int retval = -ENOMEM;
 332
 333         slot = kzalloc(sizeof(*slot), GFP_KERNEL);
 334         if (!slot)
 335                 goto error;
 336
 337         slot->hotplug_slot = kzalloc(sizeof(*slot->hotplug_slot), GFP_KERNEL);
 338         if (!slot->hotplug_slot)
 339                 goto error_slot;
 340
 341         slot->hotplug_slot->info = &slot->info;
 342
 343         slot->hotplug_slot->name = slot->name;
 344
 345         slot->hotplug_slot->private = slot;
 346         slot->hotplug_slot->release = &release_slot;
 347         slot->hotplug_slot->ops = &acpi_hotplug_slot_ops;
 348
 349         slot->acpi_slot = acpiphp_slot;
 350         slot->hotplug_slot->info->power_status = acpiphp_get_power_status(slot->acpi_slot);
 351         slot->hotplug_slot->info->attention_status = 0;
 352         slot->hotplug_slot->info->latch_status = acpiphp_get_latch_status(slot->acpi_slot);
 353         slot->hotplug_slot->info->adapter_status = acpiphp_get_adapter_status(slot->acpi_slot);
 354         slot->hotplug_slot->info->max_bus_speed = PCI_SPEED_UNKNOWN;
 355         slot->hotplug_slot->info->cur_bus_speed = PCI_SPEED_UNKNOWN;
 356
 357         acpiphp_slot->slot = slot;
 358         snprintf(slot->name, sizeof(slot->name), "%u", slot->acpi_slot->sun);
 359
 360         retval = pci_hp_register(slot->hotplug_slot);
 361         if (retval) {
 362                 err("pci_hp_register failed with error %d\n", retval);
 363                 goto error_hpslot;
 364         }
 365
 366         info("Slot [%s] registered\n", slot->hotplug_slot->name);
 367
 368         return 0;
 369 error_hpslot:
 370         kfree(slot->hotplug_slot);
 371 error_slot:
 372         kfree(slot);
 373 error:
 374         return retval;
 375 }
 376
 377
 378 void acpiphp_unregister_hotplug_slot(struct acpiphp_slot *acpiphp_slot)
 379 {
 380         struct slot *slot = acpiphp_slot->slot;
 381         int retval = 0;
 382
 383         info ("Slot [%s] unregistered\n", slot->hotplug_slot->name);
 384
 385         retval = pci_hp_deregister(slot->hotplug_slot);
 386         if (retval)
 387                 err("pci_hp_deregister failed with error %d\n", retval);
 388 }
 389
 390
 391 static int __init acpiphp_init(void)
 392 {
 393         info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
 394
 395         if (acpi_pci_disabled)
 396                 return 0;
 397
 398         acpiphp_debug = debug;
 399
 400         /* read all the ACPI info from the system */
 401         return init_acpi();
 402 }
 403
 404
 405 static void __exit acpiphp_exit(void)
 406 {
 407         if (acpi_pci_disabled)
 408                 return;
 409
 410         /* deallocate internal data structures etc. */
 411         acpiphp_glue_exit();
 412 }
 413
 414 module_init(acpiphp_init);
 415 module_exit(acpiphp_exit);