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