1 /* 2 * acpi_container.c - ACPI Generic Container Driver 3 * ($Revision: ) 4 * 5 * Copyright (C) 2004 Anil S Keshavamurthy (anil.s.keshavamurthy@intel.com) 6 * Copyright (C) 2004 Keiichiro Tokunaga (tokunaga.keiich@jp.fujitsu.com) 7 * Copyright (C) 2004 Motoyuki Ito (motoyuki@soft.fujitsu.com) 8 * Copyright (C) 2004 Intel Corp. 9 * Copyright (C) 2004 FUJITSU LIMITED 10 * 11 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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. See the GNU 21 * General Public License for more details. 22 * 23 * You should have received a copy of the GNU General Public License along 24 * with this program; if not, write to the Free Software Foundation, Inc., 25 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. 26 * 27 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 28 */ 29 #include <linux/kernel.h> 30 #include <linux/module.h> 31 #include <linux/init.h> 32 #include <linux/types.h> 33 #include <linux/acpi.h> 34 #include <acpi/acpi_bus.h> 35 #include <acpi/acpi_drivers.h> 36 #include <acpi/container.h> 37 38 #define ACPI_CONTAINER_DRIVER_NAME "ACPI container driver" 39 #define ACPI_CONTAINER_DEVICE_NAME "ACPI container device" 40 #define ACPI_CONTAINER_CLASS "container" 41 42 #define INSTALL_NOTIFY_HANDLER 1 43 #define UNINSTALL_NOTIFY_HANDLER 2 44 45 #define ACPI_CONTAINER_COMPONENT 0x01000000 46 #define _COMPONENT ACPI_CONTAINER_COMPONENT 47 ACPI_MODULE_NAME ("acpi_container") 48 49 MODULE_AUTHOR("Anil S Keshavamurthy"); 50 MODULE_DESCRIPTION(ACPI_CONTAINER_DRIVER_NAME); 51 MODULE_LICENSE("GPL"); 52 53 #define ACPI_STA_PRESENT (0x00000001) 54 55 static int acpi_container_add(struct acpi_device *device); 56 static int acpi_container_remove(struct acpi_device *device, int type); 57 58 static struct acpi_driver acpi_container_driver = { 59 .name = ACPI_CONTAINER_DRIVER_NAME, 60 .class = ACPI_CONTAINER_CLASS, 61 .ids = "ACPI0004,PNP0A05,PNP0A06", 62 .ops = { 63 .add = acpi_container_add, 64 .remove = acpi_container_remove, 65 }, 66 }; 67 68 69 /*******************************************************************/ 70 71 static int 72 is_device_present(acpi_handle handle) 73 { 74 acpi_handle temp; 75 acpi_status status; 76 unsigned long sta; 77 78 ACPI_FUNCTION_TRACE("is_device_present"); 79 80 status = acpi_get_handle(handle, "_STA", &temp); 81 if (ACPI_FAILURE(status)) 82 return_VALUE(1); /* _STA not found, assmue device present */ 83 84 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 85 if (ACPI_FAILURE(status)) 86 return_VALUE(0); /* Firmware error */ 87 88 return_VALUE((sta & ACPI_STA_PRESENT) == ACPI_STA_PRESENT); 89 } 90 91 /*******************************************************************/ 92 static int 93 acpi_container_add(struct acpi_device *device) 94 { 95 struct acpi_container *container; 96 97 ACPI_FUNCTION_TRACE("acpi_container_add"); 98 99 if (!device) { 100 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "device is NULL\n")); 101 return_VALUE(-EINVAL); 102 } 103 104 container = kmalloc(sizeof(struct acpi_container), GFP_KERNEL); 105 if(!container) 106 return_VALUE(-ENOMEM); 107 108 memset(container, 0, sizeof(struct acpi_container)); 109 container->handle = device->handle; 110 strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME); 111 strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS); 112 acpi_driver_data(device) = container; 113 114 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n", \ 115 acpi_device_name(device), acpi_device_bid(device))); 116 117 118 return_VALUE(0); 119 } 120 121 static int 122 acpi_container_remove(struct acpi_device *device, int type) 123 { 124 acpi_status status = AE_OK; 125 struct acpi_container *pc = NULL; 126 pc = (struct acpi_container*) acpi_driver_data(device); 127 128 if (pc) 129 kfree(pc); 130 131 return status; 132 } 133 134 135 static int 136 container_device_add(struct acpi_device **device, acpi_handle handle) 137 { 138 acpi_handle phandle; 139 struct acpi_device *pdev; 140 int result; 141 142 ACPI_FUNCTION_TRACE("container_device_add"); 143 144 if (acpi_get_parent(handle, &phandle)) { 145 return_VALUE(-ENODEV); 146 } 147 148 if (acpi_bus_get_device(phandle, &pdev)) { 149 return_VALUE(-ENODEV); 150 } 151 152 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) { 153 return_VALUE(-ENODEV); 154 } 155 156 result = acpi_bus_start(*device); 157 158 return_VALUE(result); 159 } 160 161 static void 162 container_notify_cb(acpi_handle handle, u32 type, void *context) 163 { 164 struct acpi_device *device = NULL; 165 int result; 166 int present; 167 acpi_status status; 168 169 ACPI_FUNCTION_TRACE("container_notify_cb"); 170 171 present = is_device_present(handle); 172 173 switch (type) { 174 case ACPI_NOTIFY_BUS_CHECK: 175 /* Fall through */ 176 case ACPI_NOTIFY_DEVICE_CHECK: 177 printk("Container driver received %s event\n", 178 (type == ACPI_NOTIFY_BUS_CHECK)? 179 "ACPI_NOTIFY_BUS_CHECK":"ACPI_NOTIFY_DEVICE_CHECK"); 180 status = acpi_bus_get_device(handle, &device); 181 if (present) { 182 if (ACPI_FAILURE(status) || !device) { 183 result = container_device_add(&device, handle); 184 if (!result) 185 kobject_hotplug(&device->kobj, 186 KOBJ_ONLINE); 187 else 188 printk("Failed to add container\n"); 189 } 190 } else { 191 if (ACPI_SUCCESS(status)) { 192 /* device exist and this is a remove request */ 193 kobject_hotplug(&device->kobj, KOBJ_OFFLINE); 194 } 195 } 196 break; 197 case ACPI_NOTIFY_EJECT_REQUEST: 198 if (!acpi_bus_get_device(handle, &device) && device) { 199 kobject_hotplug(&device->kobj, KOBJ_OFFLINE); 200 } 201 break; 202 default: 203 break; 204 } 205 return_VOID; 206 } 207 208 static acpi_status 209 container_walk_namespace_cb(acpi_handle handle, 210 u32 lvl, 211 void *context, 212 void **rv) 213 { 214 char *hid = NULL; 215 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; 216 struct acpi_device_info *info; 217 acpi_status status; 218 int *action = context; 219 220 ACPI_FUNCTION_TRACE("container_walk_namespace_cb"); 221 222 status = acpi_get_object_info(handle, &buffer); 223 if (ACPI_FAILURE(status) || !buffer.pointer) { 224 return_ACPI_STATUS(AE_OK); 225 } 226 227 info = buffer.pointer; 228 if (info->valid & ACPI_VALID_HID) 229 hid = info->hardware_id.value; 230 231 if (hid == NULL) { 232 goto end; 233 } 234 235 if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") && 236 strcmp(hid, "PNP0A06")) { 237 goto end; 238 } 239 240 switch(*action) { 241 case INSTALL_NOTIFY_HANDLER: 242 acpi_install_notify_handler(handle, 243 ACPI_SYSTEM_NOTIFY, 244 container_notify_cb, 245 NULL); 246 break; 247 case UNINSTALL_NOTIFY_HANDLER: 248 acpi_remove_notify_handler(handle, 249 ACPI_SYSTEM_NOTIFY, 250 container_notify_cb); 251 break; 252 default: 253 break; 254 } 255 256 end: 257 acpi_os_free(buffer.pointer); 258 259 return_ACPI_STATUS(AE_OK); 260 } 261 262 263 static int __init 264 acpi_container_init(void) 265 { 266 int result = 0; 267 int action = INSTALL_NOTIFY_HANDLER; 268 269 result = acpi_bus_register_driver(&acpi_container_driver); 270 if (result < 0) { 271 return(result); 272 } 273 274 /* register notify handler to every container device */ 275 acpi_walk_namespace(ACPI_TYPE_DEVICE, 276 ACPI_ROOT_OBJECT, 277 ACPI_UINT32_MAX, 278 container_walk_namespace_cb, 279 &action, NULL); 280 281 return(0); 282 } 283 284 static void __exit 285 acpi_container_exit(void) 286 { 287 int action = UNINSTALL_NOTIFY_HANDLER; 288 289 ACPI_FUNCTION_TRACE("acpi_container_exit"); 290 291 acpi_walk_namespace(ACPI_TYPE_DEVICE, 292 ACPI_ROOT_OBJECT, 293 ACPI_UINT32_MAX, 294 container_walk_namespace_cb, 295 &action, NULL); 296 297 acpi_bus_unregister_driver(&acpi_container_driver); 298 299 return_VOID; 300 } 301 302 module_init(acpi_container_init); 303 module_exit(acpi_container_exit); 304