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 */ 138 static int enable_slot(struct hotplug_slot *hotplug_slot) 139 { 140 struct slot *slot = hotplug_slot->private; 141 142 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 143 144 /* enable the specified slot */ 145 return acpiphp_enable_slot(slot->acpi_slot); 146 } 147 148 149 /** 150 * disable_slot - disable and power off a slot 151 * @hotplug_slot: slot to disable 152 * 153 * Actual tasks are done in acpiphp_disable_slot() 154 * 155 */ 156 static int disable_slot(struct hotplug_slot *hotplug_slot) 157 { 158 struct slot *slot = hotplug_slot->private; 159 160 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 161 162 /* disable the specified slot */ 163 return acpiphp_disable_slot(slot->acpi_slot); 164 } 165 166 167 /** 168 * set_attention_status - set attention LED 169 * @hotplug_slot: slot to set attention LED on 170 * @status: value to set attention LED to (0 or 1) 171 * 172 * attention status LED, so we use a callback that 173 * was registered with us. This allows hardware specific 174 * ACPI implementations to blink the light for us. 175 **/ 176 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status) 177 { 178 int retval = -ENODEV; 179 180 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 181 182 if (attention_info && try_module_get(attention_info->owner)) { 183 retval = attention_info->set_attn(hotplug_slot, status); 184 module_put(attention_info->owner); 185 } else 186 attention_info = NULL; 187 return retval; 188 } 189 190 191 /** 192 * get_power_status - get power status of a slot 193 * @hotplug_slot: slot to get status 194 * @value: pointer to store status 195 * 196 * Some platforms may not implement _STA method properly. 197 * In that case, the value returned may not be reliable. 198 * 199 */ 200 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value) 201 { 202 struct slot *slot = hotplug_slot->private; 203 204 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 205 206 *value = acpiphp_get_power_status(slot->acpi_slot); 207 208 return 0; 209 } 210 211 212 /** 213 * get_attention_status - get attention LED status 214 * @hotplug_slot: slot to get status from 215 * @value: returns with value of attention LED 216 * 217 * ACPI doesn't have known method to determine the state 218 * of the attention status LED, so we use a callback that 219 * was registered with us. This allows hardware specific 220 * ACPI implementations to determine its state 221 **/ 222 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value) 223 { 224 int retval = -EINVAL; 225 226 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 227 228 if (attention_info && try_module_get(attention_info->owner)) { 229 retval = attention_info->get_attn(hotplug_slot, value); 230 module_put(attention_info->owner); 231 } else 232 attention_info = NULL; 233 return retval; 234 } 235 236 237 /** 238 * get_latch_status - get latch status of a slot 239 * @hotplug_slot: slot to get status 240 * @value: pointer to store status 241 * 242 * ACPI doesn't provide any formal means to access latch status. 243 * Instead, we fake latch status from _STA 244 * 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 */ 267 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value) 268 { 269 struct slot *slot = hotplug_slot->private; 270 271 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 272 273 *value = acpiphp_get_adapter_status(slot->acpi_slot); 274 275 return 0; 276 } 277 278 279 /** 280 * get_address - get pci address of a slot 281 * @hotplug_slot: slot to get status 282 * @value: pointer to struct pci_busdev (seg, bus, dev) 283 */ 284 static int get_address(struct hotplug_slot *hotplug_slot, u32 *value) 285 { 286 struct slot *slot = hotplug_slot->private; 287 288 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 289 290 *value = acpiphp_get_address(slot->acpi_slot); 291 292 return 0; 293 } 294 295 static int __init init_acpi(void) 296 { 297 int retval; 298 299 /* initialize internal data structure etc. */ 300 retval = acpiphp_glue_init(); 301 302 /* read initial number of slots */ 303 if (!retval) { 304 num_slots = acpiphp_get_num_slots(); 305 if (num_slots == 0) { 306 acpiphp_glue_exit(); 307 retval = -ENODEV; 308 } 309 } 310 311 return retval; 312 } 313 314 /** 315 * release_slot - free up the memory used by a slot 316 * @hotplug_slot: slot to free 317 */ 318 static void release_slot(struct hotplug_slot *hotplug_slot) 319 { 320 struct slot *slot = hotplug_slot->private; 321 322 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 323 324 kfree(slot->hotplug_slot); 325 kfree(slot); 326 } 327 328 /* callback routine to initialize 'struct slot' for each slot */ 329 int acpiphp_register_hotplug_slot(struct acpiphp_slot *acpiphp_slot) 330 { 331 struct slot *slot; 332 int retval = -ENOMEM; 333 334 slot = kzalloc(sizeof(*slot), GFP_KERNEL); 335 if (!slot) 336 goto error; 337 338 slot->hotplug_slot = kzalloc(sizeof(*slot->hotplug_slot), GFP_KERNEL); 339 if (!slot->hotplug_slot) 340 goto error_slot; 341 342 slot->hotplug_slot->info = &slot->info; 343 344 slot->hotplug_slot->name = slot->name; 345 346 slot->hotplug_slot->private = slot; 347 slot->hotplug_slot->release = &release_slot; 348 slot->hotplug_slot->ops = &acpi_hotplug_slot_ops; 349 350 slot->acpi_slot = acpiphp_slot; 351 slot->hotplug_slot->info->power_status = acpiphp_get_power_status(slot->acpi_slot); 352 slot->hotplug_slot->info->attention_status = 0; 353 slot->hotplug_slot->info->latch_status = acpiphp_get_latch_status(slot->acpi_slot); 354 slot->hotplug_slot->info->adapter_status = acpiphp_get_adapter_status(slot->acpi_slot); 355 slot->hotplug_slot->info->max_bus_speed = PCI_SPEED_UNKNOWN; 356 slot->hotplug_slot->info->cur_bus_speed = PCI_SPEED_UNKNOWN; 357 358 acpiphp_slot->slot = slot; 359 snprintf(slot->name, sizeof(slot->name), "%u", slot->acpi_slot->sun); 360 361 retval = pci_hp_register(slot->hotplug_slot); 362 if (retval) { 363 err("pci_hp_register failed with error %d\n", retval); 364 goto error_hpslot; 365 } 366 367 info("Slot [%s] registered\n", slot->hotplug_slot->name); 368 369 return 0; 370 error_hpslot: 371 kfree(slot->hotplug_slot); 372 error_slot: 373 kfree(slot); 374 error: 375 return retval; 376 } 377 378 379 void acpiphp_unregister_hotplug_slot(struct acpiphp_slot *acpiphp_slot) 380 { 381 struct slot *slot = acpiphp_slot->slot; 382 int retval = 0; 383 384 info ("Slot [%s] unregistered\n", slot->hotplug_slot->name); 385 386 retval = pci_hp_deregister(slot->hotplug_slot); 387 if (retval) 388 err("pci_hp_deregister failed with error %d\n", retval); 389 } 390 391 392 static int __init acpiphp_init(void) 393 { 394 info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); 395 396 acpiphp_debug = debug; 397 398 /* read all the ACPI info from the system */ 399 return init_acpi(); 400 } 401 402 403 static void __exit acpiphp_exit(void) 404 { 405 /* deallocate internal data structures etc. */ 406 acpiphp_glue_exit(); 407 } 408 409 module_init(acpiphp_init); 410 module_exit(acpiphp_exit); 411