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 #define ACPI_STA_PRESENT (0x00000001) 53 54 static int acpi_container_add(struct acpi_device *device); 55 static int acpi_container_remove(struct acpi_device *device, int type); 56 57 static struct acpi_driver acpi_container_driver = { 58 .name = "container", 59 .class = ACPI_CONTAINER_CLASS, 60 .ids = "ACPI0004,PNP0A05,PNP0A06", 61 .ops = { 62 .add = acpi_container_add, 63 .remove = acpi_container_remove, 64 }, 65 }; 66 67 /*******************************************************************/ 68 69 static int is_device_present(acpi_handle handle) 70 { 71 acpi_handle temp; 72 acpi_status status; 73 unsigned long sta; 74 75 76 status = acpi_get_handle(handle, "_STA", &temp); 77 if (ACPI_FAILURE(status)) 78 return 1; /* _STA not found, assmue device present */ 79 80 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 81 if (ACPI_FAILURE(status)) 82 return 0; /* Firmware error */ 83 84 return ((sta & ACPI_STA_PRESENT) == ACPI_STA_PRESENT); 85 } 86 87 /*******************************************************************/ 88 static int acpi_container_add(struct acpi_device *device) 89 { 90 struct acpi_container *container; 91 92 93 if (!device) { 94 printk(KERN_ERR PREFIX "device is NULL\n"); 95 return -EINVAL; 96 } 97 98 container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL); 99 if (!container) 100 return -ENOMEM; 101 102 container->handle = device->handle; 103 strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME); 104 strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS); 105 acpi_driver_data(device) = container; 106 107 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n", 108 acpi_device_name(device), acpi_device_bid(device))); 109 110 return 0; 111 } 112 113 static int acpi_container_remove(struct acpi_device *device, int type) 114 { 115 acpi_status status = AE_OK; 116 struct acpi_container *pc = NULL; 117 118 pc = acpi_driver_data(device); 119 kfree(pc); 120 return status; 121 } 122 123 static int container_device_add(struct acpi_device **device, acpi_handle handle) 124 { 125 acpi_handle phandle; 126 struct acpi_device *pdev; 127 int result; 128 129 130 if (acpi_get_parent(handle, &phandle)) { 131 return -ENODEV; 132 } 133 134 if (acpi_bus_get_device(phandle, &pdev)) { 135 return -ENODEV; 136 } 137 138 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) { 139 return -ENODEV; 140 } 141 142 result = acpi_bus_start(*device); 143 144 return result; 145 } 146 147 static void container_notify_cb(acpi_handle handle, u32 type, void *context) 148 { 149 struct acpi_device *device = NULL; 150 int result; 151 int present; 152 acpi_status status; 153 154 155 present = is_device_present(handle); 156 157 switch (type) { 158 case ACPI_NOTIFY_BUS_CHECK: 159 /* Fall through */ 160 case ACPI_NOTIFY_DEVICE_CHECK: 161 printk("Container driver received %s event\n", 162 (type == ACPI_NOTIFY_BUS_CHECK) ? 163 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"); 164 status = acpi_bus_get_device(handle, &device); 165 if (present) { 166 if (ACPI_FAILURE(status) || !device) { 167 result = container_device_add(&device, handle); 168 if (!result) 169 kobject_uevent(&device->dev.kobj, 170 KOBJ_ONLINE); 171 else 172 printk("Failed to add container\n"); 173 } 174 } else { 175 if (ACPI_SUCCESS(status)) { 176 /* device exist and this is a remove request */ 177 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 178 } 179 } 180 break; 181 case ACPI_NOTIFY_EJECT_REQUEST: 182 if (!acpi_bus_get_device(handle, &device) && device) { 183 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 184 } 185 break; 186 default: 187 break; 188 } 189 return; 190 } 191 192 static acpi_status 193 container_walk_namespace_cb(acpi_handle handle, 194 u32 lvl, void *context, void **rv) 195 { 196 char *hid = NULL; 197 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 198 struct acpi_device_info *info; 199 acpi_status status; 200 int *action = context; 201 202 203 status = acpi_get_object_info(handle, &buffer); 204 if (ACPI_FAILURE(status) || !buffer.pointer) { 205 return AE_OK; 206 } 207 208 info = buffer.pointer; 209 if (info->valid & ACPI_VALID_HID) 210 hid = info->hardware_id.value; 211 212 if (hid == NULL) { 213 goto end; 214 } 215 216 if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") && 217 strcmp(hid, "PNP0A06")) { 218 goto end; 219 } 220 221 switch (*action) { 222 case INSTALL_NOTIFY_HANDLER: 223 acpi_install_notify_handler(handle, 224 ACPI_SYSTEM_NOTIFY, 225 container_notify_cb, NULL); 226 break; 227 case UNINSTALL_NOTIFY_HANDLER: 228 acpi_remove_notify_handler(handle, 229 ACPI_SYSTEM_NOTIFY, 230 container_notify_cb); 231 break; 232 default: 233 break; 234 } 235 236 end: 237 kfree(buffer.pointer); 238 239 return AE_OK; 240 } 241 242 static int __init acpi_container_init(void) 243 { 244 int result = 0; 245 int action = INSTALL_NOTIFY_HANDLER; 246 247 result = acpi_bus_register_driver(&acpi_container_driver); 248 if (result < 0) { 249 return (result); 250 } 251 252 /* register notify handler to every container device */ 253 acpi_walk_namespace(ACPI_TYPE_DEVICE, 254 ACPI_ROOT_OBJECT, 255 ACPI_UINT32_MAX, 256 container_walk_namespace_cb, &action, NULL); 257 258 return (0); 259 } 260 261 static void __exit acpi_container_exit(void) 262 { 263 int action = UNINSTALL_NOTIFY_HANDLER; 264 265 266 acpi_walk_namespace(ACPI_TYPE_DEVICE, 267 ACPI_ROOT_OBJECT, 268 ACPI_UINT32_MAX, 269 container_walk_namespace_cb, &action, NULL); 270 271 acpi_bus_unregister_driver(&acpi_container_driver); 272 273 return; 274 } 275 276 module_init(acpi_container_init); 277 module_exit(acpi_container_exit); 278