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 <linux/smp_lock.h> 44 #include "acpiphp.h" 45 46 #define MY_NAME "acpiphp" 47 48 static int debug; 49 int acpiphp_debug; 50 51 /* local variables */ 52 static int num_slots; 53 static struct acpiphp_attention_info *attention_info; 54 55 #define DRIVER_VERSION "0.5" 56 #define DRIVER_AUTHOR "Greg Kroah-Hartman <gregkh@us.ibm.com>, Takayoshi Kochi <t-kochi@bq.jp.nec.com>, Matthew Wilcox <willy@hp.com>" 57 #define DRIVER_DESC "ACPI Hot Plug PCI Controller Driver" 58 59 MODULE_AUTHOR(DRIVER_AUTHOR); 60 MODULE_DESCRIPTION(DRIVER_DESC); 61 MODULE_LICENSE("GPL"); 62 MODULE_PARM_DESC(debug, "Debugging mode enabled or not"); 63 module_param(debug, bool, 0644); 64 65 /* export the attention callback registration methods */ 66 EXPORT_SYMBOL_GPL(acpiphp_register_attention); 67 EXPORT_SYMBOL_GPL(acpiphp_unregister_attention); 68 69 static int enable_slot (struct hotplug_slot *slot); 70 static int disable_slot (struct hotplug_slot *slot); 71 static int set_attention_status (struct hotplug_slot *slot, u8 value); 72 static int get_power_status (struct hotplug_slot *slot, u8 *value); 73 static int get_attention_status (struct hotplug_slot *slot, u8 *value); 74 static int get_address (struct hotplug_slot *slot, u32 *value); 75 static int get_latch_status (struct hotplug_slot *slot, u8 *value); 76 static int get_adapter_status (struct hotplug_slot *slot, u8 *value); 77 78 static struct hotplug_slot_ops acpi_hotplug_slot_ops = { 79 .owner = THIS_MODULE, 80 .enable_slot = enable_slot, 81 .disable_slot = disable_slot, 82 .set_attention_status = set_attention_status, 83 .get_power_status = get_power_status, 84 .get_attention_status = get_attention_status, 85 .get_latch_status = get_latch_status, 86 .get_adapter_status = get_adapter_status, 87 .get_address = get_address, 88 }; 89 90 91 /** 92 * acpiphp_register_attention - set attention LED callback 93 * @info: must be completely filled with LED callbacks 94 * 95 * Description: this is used to register a hardware specific ACPI 96 * driver that manipulates the attention LED. All the fields in 97 * info must be set. 98 **/ 99 int acpiphp_register_attention(struct acpiphp_attention_info *info) 100 { 101 int retval = -EINVAL; 102 103 if (info && info->owner && info->set_attn && 104 info->get_attn && !attention_info) { 105 retval = 0; 106 attention_info = info; 107 } 108 return retval; 109 } 110 111 112 /** 113 * acpiphp_unregister_attention - unset attention LED callback 114 * @info: must match the pointer used to register 115 * 116 * Description: this is used to un-register a hardware specific acpi 117 * driver that manipulates the attention LED. The pointer to the 118 * info struct must be the same as the one used to set it. 119 **/ 120 int acpiphp_unregister_attention(struct acpiphp_attention_info *info) 121 { 122 int retval = -EINVAL; 123 124 if (info && attention_info == info) { 125 attention_info = NULL; 126 retval = 0; 127 } 128 return retval; 129 } 130 131 132 /** 133 * enable_slot - power on and enable a slot 134 * @hotplug_slot: slot to enable 135 * 136 * Actual tasks are done in acpiphp_enable_slot() 137 * 138 */ 139 static int enable_slot(struct hotplug_slot *hotplug_slot) 140 { 141 struct slot *slot = hotplug_slot->private; 142 143 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 144 145 /* enable the specified slot */ 146 return acpiphp_enable_slot(slot->acpi_slot); 147 } 148 149 150 /** 151 * disable_slot - disable and power off a slot 152 * @hotplug_slot: slot to disable 153 * 154 * Actual tasks are done in acpiphp_disable_slot() 155 * 156 */ 157 static int disable_slot(struct hotplug_slot *hotplug_slot) 158 { 159 struct slot *slot = hotplug_slot->private; 160 161 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 162 163 /* disable the specified slot */ 164 return acpiphp_disable_slot(slot->acpi_slot); 165 } 166 167 168 /** 169 * set_attention_status - set attention LED 170 * @hotplug_slot: slot to set attention LED on 171 * @status: value to set attention LED to (0 or 1) 172 * 173 * attention status LED, so we use a callback that 174 * was registered with us. This allows hardware specific 175 * ACPI implementations to blink the light for us. 176 **/ 177 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status) 178 { 179 int retval = -ENODEV; 180 181 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 182 183 if (attention_info && try_module_get(attention_info->owner)) { 184 retval = attention_info->set_attn(hotplug_slot, status); 185 module_put(attention_info->owner); 186 } else 187 attention_info = NULL; 188 return retval; 189 } 190 191 192 /** 193 * get_power_status - get power status of a slot 194 * @hotplug_slot: slot to get status 195 * @value: pointer to store status 196 * 197 * Some platforms may not implement _STA method properly. 198 * In that case, the value returned may not be reliable. 199 * 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 */ 247 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value) 248 { 249 struct slot *slot = hotplug_slot->private; 250 251 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 252 253 *value = acpiphp_get_latch_status(slot->acpi_slot); 254 255 return 0; 256 } 257 258 259 /** 260 * get_adapter_status - get adapter status of a slot 261 * @hotplug_slot: slot to get status 262 * @value: pointer to store status 263 * 264 * ACPI doesn't provide any formal means to access adapter status. 265 * Instead, we fake adapter status from _STA 266 * 267 */ 268 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value) 269 { 270 struct slot *slot = hotplug_slot->private; 271 272 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 273 274 *value = acpiphp_get_adapter_status(slot->acpi_slot); 275 276 return 0; 277 } 278 279 280 /** 281 * get_address - get pci address of a slot 282 * @hotplug_slot: slot to get status 283 * @value: pointer to struct pci_busdev (seg, bus, dev) 284 */ 285 static int get_address(struct hotplug_slot *hotplug_slot, u32 *value) 286 { 287 struct slot *slot = hotplug_slot->private; 288 289 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 290 291 *value = acpiphp_get_address(slot->acpi_slot); 292 293 return 0; 294 } 295 296 static int __init init_acpi(void) 297 { 298 int retval; 299 300 /* initialize internal data structure etc. */ 301 retval = acpiphp_glue_init(); 302 303 /* read initial number of slots */ 304 if (!retval) { 305 num_slots = acpiphp_get_num_slots(); 306 if (num_slots == 0) { 307 acpiphp_glue_exit(); 308 retval = -ENODEV; 309 } 310 } 311 312 return retval; 313 } 314 315 /** 316 * release_slot - free up the memory used by a slot 317 * @hotplug_slot: slot to free 318 */ 319 static void release_slot(struct hotplug_slot *hotplug_slot) 320 { 321 struct slot *slot = hotplug_slot->private; 322 323 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 324 325 kfree(slot->hotplug_slot); 326 kfree(slot); 327 } 328 329 /* callback routine to initialize 'struct slot' for each slot */ 330 int acpiphp_register_hotplug_slot(struct acpiphp_slot *acpiphp_slot) 331 { 332 struct slot *slot; 333 int retval = -ENOMEM; 334 335 slot = kzalloc(sizeof(*slot), GFP_KERNEL); 336 if (!slot) 337 goto error; 338 339 slot->hotplug_slot = kzalloc(sizeof(*slot->hotplug_slot), GFP_KERNEL); 340 if (!slot->hotplug_slot) 341 goto error_slot; 342 343 slot->hotplug_slot->info = &slot->info; 344 345 slot->hotplug_slot->name = slot->name; 346 347 slot->hotplug_slot->private = slot; 348 slot->hotplug_slot->release = &release_slot; 349 slot->hotplug_slot->ops = &acpi_hotplug_slot_ops; 350 351 slot->acpi_slot = acpiphp_slot; 352 slot->hotplug_slot->info->power_status = acpiphp_get_power_status(slot->acpi_slot); 353 slot->hotplug_slot->info->attention_status = 0; 354 slot->hotplug_slot->info->latch_status = acpiphp_get_latch_status(slot->acpi_slot); 355 slot->hotplug_slot->info->adapter_status = acpiphp_get_adapter_status(slot->acpi_slot); 356 slot->hotplug_slot->info->max_bus_speed = PCI_SPEED_UNKNOWN; 357 slot->hotplug_slot->info->cur_bus_speed = PCI_SPEED_UNKNOWN; 358 359 acpiphp_slot->slot = slot; 360 snprintf(slot->name, sizeof(slot->name), "%u", slot->acpi_slot->sun); 361 362 retval = pci_hp_register(slot->hotplug_slot); 363 if (retval) { 364 err("pci_hp_register failed with error %d\n", retval); 365 goto error_hpslot; 366 } 367 368 info("Slot [%s] registered\n", slot->hotplug_slot->name); 369 370 return 0; 371 error_hpslot: 372 kfree(slot->hotplug_slot); 373 error_slot: 374 kfree(slot); 375 error: 376 return retval; 377 } 378 379 380 void acpiphp_unregister_hotplug_slot(struct acpiphp_slot *acpiphp_slot) 381 { 382 struct slot *slot = acpiphp_slot->slot; 383 int retval = 0; 384 385 info ("Slot [%s] unregistered\n", slot->hotplug_slot->name); 386 387 retval = pci_hp_deregister(slot->hotplug_slot); 388 if (retval) 389 err("pci_hp_deregister failed with error %d\n", retval); 390 } 391 392 393 static int __init acpiphp_init(void) 394 { 395 info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); 396 397 acpiphp_debug = debug; 398 399 /* read all the ACPI info from the system */ 400 return init_acpi(); 401 } 402 403 404 static void __exit acpiphp_exit(void) 405 { 406 /* deallocate internal data structures etc. */ 407 acpiphp_glue_exit(); 408 } 409 410 module_init(acpiphp_init); 411 module_exit(acpiphp_exit); 412