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 _COMPONENT ACPI_CONTAINER_COMPONENT 45 ACPI_MODULE_NAME("container"); 46 47 MODULE_AUTHOR("Anil S Keshavamurthy"); 48 MODULE_DESCRIPTION("ACPI container driver"); 49 MODULE_LICENSE("GPL"); 50 51 static int acpi_container_add(struct acpi_device *device); 52 static int acpi_container_remove(struct acpi_device *device, int type); 53 54 static const struct acpi_device_id container_device_ids[] = { 55 {"ACPI0004", 0}, 56 {"PNP0A05", 0}, 57 {"PNP0A06", 0}, 58 {"", 0}, 59 }; 60 MODULE_DEVICE_TABLE(acpi, container_device_ids); 61 62 static struct acpi_driver acpi_container_driver = { 63 .name = "container", 64 .class = ACPI_CONTAINER_CLASS, 65 .ids = container_device_ids, 66 .ops = { 67 .add = acpi_container_add, 68 .remove = acpi_container_remove, 69 }, 70 }; 71 72 /*******************************************************************/ 73 74 static int is_device_present(acpi_handle handle) 75 { 76 acpi_handle temp; 77 acpi_status status; 78 unsigned long long sta; 79 80 81 status = acpi_get_handle(handle, "_STA", &temp); 82 if (ACPI_FAILURE(status)) 83 return 1; /* _STA not found, assume device present */ 84 85 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 86 if (ACPI_FAILURE(status)) 87 return 0; /* Firmware error */ 88 89 return ((sta & ACPI_STA_DEVICE_PRESENT) == ACPI_STA_DEVICE_PRESENT); 90 } 91 92 /*******************************************************************/ 93 static int acpi_container_add(struct acpi_device *device) 94 { 95 struct acpi_container *container; 96 97 98 if (!device) { 99 printk(KERN_ERR PREFIX "device is NULL\n"); 100 return -EINVAL; 101 } 102 103 container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL); 104 if (!container) 105 return -ENOMEM; 106 107 container->handle = device->handle; 108 strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME); 109 strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS); 110 device->driver_data = container; 111 112 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n", 113 acpi_device_name(device), acpi_device_bid(device))); 114 115 return 0; 116 } 117 118 static int acpi_container_remove(struct acpi_device *device, int type) 119 { 120 acpi_status status = AE_OK; 121 struct acpi_container *pc = NULL; 122 123 pc = acpi_driver_data(device); 124 kfree(pc); 125 return status; 126 } 127 128 static int container_device_add(struct acpi_device **device, acpi_handle handle) 129 { 130 acpi_handle phandle; 131 struct acpi_device *pdev; 132 int result; 133 134 135 if (acpi_get_parent(handle, &phandle)) { 136 return -ENODEV; 137 } 138 139 if (acpi_bus_get_device(phandle, &pdev)) { 140 return -ENODEV; 141 } 142 143 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) { 144 return -ENODEV; 145 } 146 147 result = acpi_bus_start(*device); 148 149 return result; 150 } 151 152 static void container_notify_cb(acpi_handle handle, u32 type, void *context) 153 { 154 struct acpi_device *device = NULL; 155 int result; 156 int present; 157 acpi_status status; 158 159 160 present = is_device_present(handle); 161 162 switch (type) { 163 case ACPI_NOTIFY_BUS_CHECK: 164 /* Fall through */ 165 case ACPI_NOTIFY_DEVICE_CHECK: 166 printk(KERN_WARNING "Container driver received %s event\n", 167 (type == ACPI_NOTIFY_BUS_CHECK) ? 168 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"); 169 status = acpi_bus_get_device(handle, &device); 170 if (present) { 171 if (ACPI_FAILURE(status) || !device) { 172 result = container_device_add(&device, handle); 173 if (!result) 174 kobject_uevent(&device->dev.kobj, 175 KOBJ_ONLINE); 176 else 177 printk(KERN_WARNING 178 "Failed to add container\n"); 179 } 180 } else { 181 if (ACPI_SUCCESS(status)) { 182 /* device exist and this is a remove request */ 183 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 184 } 185 } 186 break; 187 case ACPI_NOTIFY_EJECT_REQUEST: 188 if (!acpi_bus_get_device(handle, &device) && device) { 189 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 190 } 191 break; 192 default: 193 break; 194 } 195 return; 196 } 197 198 static acpi_status 199 container_walk_namespace_cb(acpi_handle handle, 200 u32 lvl, void *context, void **rv) 201 { 202 char *hid = NULL; 203 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 204 struct acpi_device_info *info; 205 acpi_status status; 206 int *action = context; 207 208 209 status = acpi_get_object_info(handle, &buffer); 210 if (ACPI_FAILURE(status) || !buffer.pointer) { 211 return AE_OK; 212 } 213 214 info = buffer.pointer; 215 if (info->valid & ACPI_VALID_HID) 216 hid = info->hardware_id.value; 217 218 if (hid == NULL) { 219 goto end; 220 } 221 222 if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") && 223 strcmp(hid, "PNP0A06")) { 224 goto end; 225 } 226 227 switch (*action) { 228 case INSTALL_NOTIFY_HANDLER: 229 acpi_install_notify_handler(handle, 230 ACPI_SYSTEM_NOTIFY, 231 container_notify_cb, NULL); 232 break; 233 case UNINSTALL_NOTIFY_HANDLER: 234 acpi_remove_notify_handler(handle, 235 ACPI_SYSTEM_NOTIFY, 236 container_notify_cb); 237 break; 238 default: 239 break; 240 } 241 242 end: 243 kfree(buffer.pointer); 244 245 return AE_OK; 246 } 247 248 static int __init acpi_container_init(void) 249 { 250 int result = 0; 251 int action = INSTALL_NOTIFY_HANDLER; 252 253 result = acpi_bus_register_driver(&acpi_container_driver); 254 if (result < 0) { 255 return (result); 256 } 257 258 /* register notify handler to every container device */ 259 acpi_walk_namespace(ACPI_TYPE_DEVICE, 260 ACPI_ROOT_OBJECT, 261 ACPI_UINT32_MAX, 262 container_walk_namespace_cb, &action, NULL); 263 264 return (0); 265 } 266 267 static void __exit acpi_container_exit(void) 268 { 269 int action = UNINSTALL_NOTIFY_HANDLER; 270 271 272 acpi_walk_namespace(ACPI_TYPE_DEVICE, 273 ACPI_ROOT_OBJECT, 274 ACPI_UINT32_MAX, 275 container_walk_namespace_cb, &action, NULL); 276 277 acpi_bus_unregister_driver(&acpi_container_driver); 278 279 return; 280 } 281 282 module_init(acpi_container_init); 283 module_exit(acpi_container_exit); 284