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 static int is_device_present(acpi_handle handle) 71 { 72 acpi_handle temp; 73 acpi_status status; 74 unsigned long sta; 75 76 ACPI_FUNCTION_TRACE("is_device_present"); 77 78 status = acpi_get_handle(handle, "_STA", &temp); 79 if (ACPI_FAILURE(status)) 80 return_VALUE(1); /* _STA not found, assmue device present */ 81 82 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 83 if (ACPI_FAILURE(status)) 84 return_VALUE(0); /* Firmware error */ 85 86 return_VALUE((sta & ACPI_STA_PRESENT) == ACPI_STA_PRESENT); 87 } 88 89 /*******************************************************************/ 90 static int acpi_container_add(struct acpi_device *device) 91 { 92 struct acpi_container *container; 93 94 ACPI_FUNCTION_TRACE("acpi_container_add"); 95 96 if (!device) { 97 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "device is NULL\n")); 98 return_VALUE(-EINVAL); 99 } 100 101 container = kmalloc(sizeof(struct acpi_container), GFP_KERNEL); 102 if (!container) 103 return_VALUE(-ENOMEM); 104 105 memset(container, 0, sizeof(struct acpi_container)); 106 container->handle = device->handle; 107 strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME); 108 strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS); 109 acpi_driver_data(device) = container; 110 111 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n", 112 acpi_device_name(device), acpi_device_bid(device))); 113 114 return_VALUE(0); 115 } 116 117 static int acpi_container_remove(struct acpi_device *device, int type) 118 { 119 acpi_status status = AE_OK; 120 struct acpi_container *pc = NULL; 121 pc = (struct acpi_container *)acpi_driver_data(device); 122 123 if (pc) 124 kfree(pc); 125 126 return status; 127 } 128 129 static int container_device_add(struct acpi_device **device, acpi_handle handle) 130 { 131 acpi_handle phandle; 132 struct acpi_device *pdev; 133 int result; 134 135 ACPI_FUNCTION_TRACE("container_device_add"); 136 137 if (acpi_get_parent(handle, &phandle)) { 138 return_VALUE(-ENODEV); 139 } 140 141 if (acpi_bus_get_device(phandle, &pdev)) { 142 return_VALUE(-ENODEV); 143 } 144 145 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) { 146 return_VALUE(-ENODEV); 147 } 148 149 result = acpi_bus_start(*device); 150 151 return_VALUE(result); 152 } 153 154 static void container_notify_cb(acpi_handle handle, u32 type, void *context) 155 { 156 struct acpi_device *device = NULL; 157 int result; 158 int present; 159 acpi_status status; 160 161 ACPI_FUNCTION_TRACE("container_notify_cb"); 162 163 present = is_device_present(handle); 164 165 switch (type) { 166 case ACPI_NOTIFY_BUS_CHECK: 167 /* Fall through */ 168 case ACPI_NOTIFY_DEVICE_CHECK: 169 printk("Container driver received %s event\n", 170 (type == ACPI_NOTIFY_BUS_CHECK) ? 171 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"); 172 status = acpi_bus_get_device(handle, &device); 173 if (present) { 174 if (ACPI_FAILURE(status) || !device) { 175 result = container_device_add(&device, handle); 176 if (!result) 177 kobject_hotplug(&device->kobj, 178 KOBJ_ONLINE); 179 else 180 printk("Failed to add container\n"); 181 } 182 } else { 183 if (ACPI_SUCCESS(status)) { 184 /* device exist and this is a remove request */ 185 kobject_hotplug(&device->kobj, KOBJ_OFFLINE); 186 } 187 } 188 break; 189 case ACPI_NOTIFY_EJECT_REQUEST: 190 if (!acpi_bus_get_device(handle, &device) && device) { 191 kobject_hotplug(&device->kobj, KOBJ_OFFLINE); 192 } 193 break; 194 default: 195 break; 196 } 197 return_VOID; 198 } 199 200 static acpi_status 201 container_walk_namespace_cb(acpi_handle handle, 202 u32 lvl, void *context, void **rv) 203 { 204 char *hid = NULL; 205 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 206 struct acpi_device_info *info; 207 acpi_status status; 208 int *action = context; 209 210 ACPI_FUNCTION_TRACE("container_walk_namespace_cb"); 211 212 status = acpi_get_object_info(handle, &buffer); 213 if (ACPI_FAILURE(status) || !buffer.pointer) { 214 return_ACPI_STATUS(AE_OK); 215 } 216 217 info = buffer.pointer; 218 if (info->valid & ACPI_VALID_HID) 219 hid = info->hardware_id.value; 220 221 if (hid == NULL) { 222 goto end; 223 } 224 225 if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") && 226 strcmp(hid, "PNP0A06")) { 227 goto end; 228 } 229 230 switch (*action) { 231 case INSTALL_NOTIFY_HANDLER: 232 acpi_install_notify_handler(handle, 233 ACPI_SYSTEM_NOTIFY, 234 container_notify_cb, NULL); 235 break; 236 case UNINSTALL_NOTIFY_HANDLER: 237 acpi_remove_notify_handler(handle, 238 ACPI_SYSTEM_NOTIFY, 239 container_notify_cb); 240 break; 241 default: 242 break; 243 } 244 245 end: 246 acpi_os_free(buffer.pointer); 247 248 return_ACPI_STATUS(AE_OK); 249 } 250 251 static int __init acpi_container_init(void) 252 { 253 int result = 0; 254 int action = INSTALL_NOTIFY_HANDLER; 255 256 result = acpi_bus_register_driver(&acpi_container_driver); 257 if (result < 0) { 258 return (result); 259 } 260 261 /* register notify handler to every container device */ 262 acpi_walk_namespace(ACPI_TYPE_DEVICE, 263 ACPI_ROOT_OBJECT, 264 ACPI_UINT32_MAX, 265 container_walk_namespace_cb, &action, NULL); 266 267 return (0); 268 } 269 270 static void __exit acpi_container_exit(void) 271 { 272 int action = UNINSTALL_NOTIFY_HANDLER; 273 274 ACPI_FUNCTION_TRACE("acpi_container_exit"); 275 276 acpi_walk_namespace(ACPI_TYPE_DEVICE, 277 ACPI_ROOT_OBJECT, 278 ACPI_UINT32_MAX, 279 container_walk_namespace_cb, &action, NULL); 280 281 acpi_bus_unregister_driver(&acpi_container_driver); 282 283 return_VOID; 284 } 285 286 module_init(acpi_container_init); 287 module_exit(acpi_container_exit); 288