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 = kmalloc(sizeof(struct acpi_container), GFP_KERNEL); 100 if (!container) 101 return -ENOMEM; 102 103 memset(container, 0, sizeof(struct acpi_container)); 104 container->handle = device->handle; 105 strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME); 106 strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS); 107 acpi_driver_data(device) = container; 108 109 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n", 110 acpi_device_name(device), acpi_device_bid(device))); 111 112 return 0; 113 } 114 115 static int acpi_container_remove(struct acpi_device *device, int type) 116 { 117 acpi_status status = AE_OK; 118 struct acpi_container *pc = NULL; 119 120 pc = (struct acpi_container *)acpi_driver_data(device); 121 kfree(pc); 122 return status; 123 } 124 125 static int container_device_add(struct acpi_device **device, acpi_handle handle) 126 { 127 acpi_handle phandle; 128 struct acpi_device *pdev; 129 int result; 130 131 132 if (acpi_get_parent(handle, &phandle)) { 133 return -ENODEV; 134 } 135 136 if (acpi_bus_get_device(phandle, &pdev)) { 137 return -ENODEV; 138 } 139 140 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) { 141 return -ENODEV; 142 } 143 144 result = acpi_bus_start(*device); 145 146 return result; 147 } 148 149 static void container_notify_cb(acpi_handle handle, u32 type, void *context) 150 { 151 struct acpi_device *device = NULL; 152 int result; 153 int present; 154 acpi_status status; 155 156 157 present = is_device_present(handle); 158 159 switch (type) { 160 case ACPI_NOTIFY_BUS_CHECK: 161 /* Fall through */ 162 case ACPI_NOTIFY_DEVICE_CHECK: 163 printk("Container driver received %s event\n", 164 (type == ACPI_NOTIFY_BUS_CHECK) ? 165 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"); 166 status = acpi_bus_get_device(handle, &device); 167 if (present) { 168 if (ACPI_FAILURE(status) || !device) { 169 result = container_device_add(&device, handle); 170 if (!result) 171 kobject_uevent(&device->kobj, 172 KOBJ_ONLINE); 173 else 174 printk("Failed to add container\n"); 175 } 176 } else { 177 if (ACPI_SUCCESS(status)) { 178 /* device exist and this is a remove request */ 179 kobject_uevent(&device->kobj, KOBJ_OFFLINE); 180 } 181 } 182 break; 183 case ACPI_NOTIFY_EJECT_REQUEST: 184 if (!acpi_bus_get_device(handle, &device) && device) { 185 kobject_uevent(&device->kobj, KOBJ_OFFLINE); 186 } 187 break; 188 default: 189 break; 190 } 191 return; 192 } 193 194 static acpi_status 195 container_walk_namespace_cb(acpi_handle handle, 196 u32 lvl, void *context, void **rv) 197 { 198 char *hid = NULL; 199 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 200 struct acpi_device_info *info; 201 acpi_status status; 202 int *action = context; 203 204 205 status = acpi_get_object_info(handle, &buffer); 206 if (ACPI_FAILURE(status) || !buffer.pointer) { 207 return AE_OK; 208 } 209 210 info = buffer.pointer; 211 if (info->valid & ACPI_VALID_HID) 212 hid = info->hardware_id.value; 213 214 if (hid == NULL) { 215 goto end; 216 } 217 218 if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") && 219 strcmp(hid, "PNP0A06")) { 220 goto end; 221 } 222 223 switch (*action) { 224 case INSTALL_NOTIFY_HANDLER: 225 acpi_install_notify_handler(handle, 226 ACPI_SYSTEM_NOTIFY, 227 container_notify_cb, NULL); 228 break; 229 case UNINSTALL_NOTIFY_HANDLER: 230 acpi_remove_notify_handler(handle, 231 ACPI_SYSTEM_NOTIFY, 232 container_notify_cb); 233 break; 234 default: 235 break; 236 } 237 238 end: 239 kfree(buffer.pointer); 240 241 return AE_OK; 242 } 243 244 static int __init acpi_container_init(void) 245 { 246 int result = 0; 247 int action = INSTALL_NOTIFY_HANDLER; 248 249 result = acpi_bus_register_driver(&acpi_container_driver); 250 if (result < 0) { 251 return (result); 252 } 253 254 /* register notify handler to every container device */ 255 acpi_walk_namespace(ACPI_TYPE_DEVICE, 256 ACPI_ROOT_OBJECT, 257 ACPI_UINT32_MAX, 258 container_walk_namespace_cb, &action, NULL); 259 260 return (0); 261 } 262 263 static void __exit acpi_container_exit(void) 264 { 265 int action = UNINSTALL_NOTIFY_HANDLER; 266 267 268 acpi_walk_namespace(ACPI_TYPE_DEVICE, 269 ACPI_ROOT_OBJECT, 270 ACPI_UINT32_MAX, 271 container_walk_namespace_cb, &action, NULL); 272 273 acpi_bus_unregister_driver(&acpi_container_driver); 274 275 return; 276 } 277 278 module_init(acpi_container_init); 279 module_exit(acpi_container_exit); 280