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_DEVICE_NAME "ACPI container device" 39 #define ACPI_CONTAINER_CLASS "container" 40 41 #define INSTALL_NOTIFY_HANDLER 1 42 #define UNINSTALL_NOTIFY_HANDLER 2 43 44 #define ACPI_CONTAINER_COMPONENT 0x01000000 45 #define _COMPONENT ACPI_CONTAINER_COMPONENT 46 ACPI_MODULE_NAME("container"); 47 48 MODULE_AUTHOR("Anil S Keshavamurthy"); 49 MODULE_DESCRIPTION("ACPI container driver"); 50 MODULE_LICENSE("GPL"); 51 52 static int acpi_container_add(struct acpi_device *device); 53 static int acpi_container_remove(struct acpi_device *device, int type); 54 55 static struct acpi_driver acpi_container_driver = { 56 .name = "container", 57 .class = ACPI_CONTAINER_CLASS, 58 .ids = "ACPI0004,PNP0A05,PNP0A06", 59 .ops = { 60 .add = acpi_container_add, 61 .remove = acpi_container_remove, 62 }, 63 }; 64 65 /*******************************************************************/ 66 67 static int is_device_present(acpi_handle handle) 68 { 69 acpi_handle temp; 70 acpi_status status; 71 unsigned long sta; 72 73 74 status = acpi_get_handle(handle, "_STA", &temp); 75 if (ACPI_FAILURE(status)) 76 return 1; /* _STA not found, assume device present */ 77 78 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 79 if (ACPI_FAILURE(status)) 80 return 0; /* Firmware error */ 81 82 return ((sta & ACPI_STA_DEVICE_PRESENT) == ACPI_STA_DEVICE_PRESENT); 83 } 84 85 /*******************************************************************/ 86 static int acpi_container_add(struct acpi_device *device) 87 { 88 struct acpi_container *container; 89 90 91 if (!device) { 92 printk(KERN_ERR PREFIX "device is NULL\n"); 93 return -EINVAL; 94 } 95 96 container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL); 97 if (!container) 98 return -ENOMEM; 99 100 container->handle = device->handle; 101 strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME); 102 strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS); 103 acpi_driver_data(device) = container; 104 105 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n", 106 acpi_device_name(device), acpi_device_bid(device))); 107 108 return 0; 109 } 110 111 static int acpi_container_remove(struct acpi_device *device, int type) 112 { 113 acpi_status status = AE_OK; 114 struct acpi_container *pc = NULL; 115 116 pc = acpi_driver_data(device); 117 kfree(pc); 118 return status; 119 } 120 121 static int container_device_add(struct acpi_device **device, acpi_handle handle) 122 { 123 acpi_handle phandle; 124 struct acpi_device *pdev; 125 int result; 126 127 128 if (acpi_get_parent(handle, &phandle)) { 129 return -ENODEV; 130 } 131 132 if (acpi_bus_get_device(phandle, &pdev)) { 133 return -ENODEV; 134 } 135 136 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) { 137 return -ENODEV; 138 } 139 140 result = acpi_bus_start(*device); 141 142 return result; 143 } 144 145 static void container_notify_cb(acpi_handle handle, u32 type, void *context) 146 { 147 struct acpi_device *device = NULL; 148 int result; 149 int present; 150 acpi_status status; 151 152 153 present = is_device_present(handle); 154 155 switch (type) { 156 case ACPI_NOTIFY_BUS_CHECK: 157 /* Fall through */ 158 case ACPI_NOTIFY_DEVICE_CHECK: 159 printk("Container driver received %s event\n", 160 (type == ACPI_NOTIFY_BUS_CHECK) ? 161 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"); 162 status = acpi_bus_get_device(handle, &device); 163 if (present) { 164 if (ACPI_FAILURE(status) || !device) { 165 result = container_device_add(&device, handle); 166 if (!result) 167 kobject_uevent(&device->dev.kobj, 168 KOBJ_ONLINE); 169 else 170 printk("Failed to add container\n"); 171 } 172 } else { 173 if (ACPI_SUCCESS(status)) { 174 /* device exist and this is a remove request */ 175 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 176 } 177 } 178 break; 179 case ACPI_NOTIFY_EJECT_REQUEST: 180 if (!acpi_bus_get_device(handle, &device) && device) { 181 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 182 } 183 break; 184 default: 185 break; 186 } 187 return; 188 } 189 190 static acpi_status 191 container_walk_namespace_cb(acpi_handle handle, 192 u32 lvl, void *context, void **rv) 193 { 194 char *hid = NULL; 195 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 196 struct acpi_device_info *info; 197 acpi_status status; 198 int *action = context; 199 200 201 status = acpi_get_object_info(handle, &buffer); 202 if (ACPI_FAILURE(status) || !buffer.pointer) { 203 return AE_OK; 204 } 205 206 info = buffer.pointer; 207 if (info->valid & ACPI_VALID_HID) 208 hid = info->hardware_id.value; 209 210 if (hid == NULL) { 211 goto end; 212 } 213 214 if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") && 215 strcmp(hid, "PNP0A06")) { 216 goto end; 217 } 218 219 switch (*action) { 220 case INSTALL_NOTIFY_HANDLER: 221 acpi_install_notify_handler(handle, 222 ACPI_SYSTEM_NOTIFY, 223 container_notify_cb, NULL); 224 break; 225 case UNINSTALL_NOTIFY_HANDLER: 226 acpi_remove_notify_handler(handle, 227 ACPI_SYSTEM_NOTIFY, 228 container_notify_cb); 229 break; 230 default: 231 break; 232 } 233 234 end: 235 kfree(buffer.pointer); 236 237 return AE_OK; 238 } 239 240 static int __init acpi_container_init(void) 241 { 242 int result = 0; 243 int action = INSTALL_NOTIFY_HANDLER; 244 245 result = acpi_bus_register_driver(&acpi_container_driver); 246 if (result < 0) { 247 return (result); 248 } 249 250 /* register notify handler to every container device */ 251 acpi_walk_namespace(ACPI_TYPE_DEVICE, 252 ACPI_ROOT_OBJECT, 253 ACPI_UINT32_MAX, 254 container_walk_namespace_cb, &action, NULL); 255 256 return (0); 257 } 258 259 static void __exit acpi_container_exit(void) 260 { 261 int action = UNINSTALL_NOTIFY_HANDLER; 262 263 264 acpi_walk_namespace(ACPI_TYPE_DEVICE, 265 ACPI_ROOT_OBJECT, 266 ACPI_UINT32_MAX, 267 container_walk_namespace_cb, &action, NULL); 268 269 acpi_bus_unregister_driver(&acpi_container_driver); 270 271 return; 272 } 273 274 module_init(acpi_container_init); 275 module_exit(acpi_container_exit); 276