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 PREFIX "ACPI: " 39 40 #define ACPI_CONTAINER_DEVICE_NAME "ACPI container device" 41 #define ACPI_CONTAINER_CLASS "container" 42 43 #define INSTALL_NOTIFY_HANDLER 1 44 #define UNINSTALL_NOTIFY_HANDLER 2 45 46 #define _COMPONENT ACPI_CONTAINER_COMPONENT 47 ACPI_MODULE_NAME("container"); 48 49 MODULE_AUTHOR("Anil S Keshavamurthy"); 50 MODULE_DESCRIPTION("ACPI container driver"); 51 MODULE_LICENSE("GPL"); 52 53 static int acpi_container_add(struct acpi_device *device); 54 static int acpi_container_remove(struct acpi_device *device, int type); 55 56 static const struct acpi_device_id container_device_ids[] = { 57 {"ACPI0004", 0}, 58 {"PNP0A05", 0}, 59 {"PNP0A06", 0}, 60 {"", 0}, 61 }; 62 MODULE_DEVICE_TABLE(acpi, container_device_ids); 63 64 static struct acpi_driver acpi_container_driver = { 65 .name = "container", 66 .class = ACPI_CONTAINER_CLASS, 67 .ids = container_device_ids, 68 .ops = { 69 .add = acpi_container_add, 70 .remove = acpi_container_remove, 71 }, 72 }; 73 74 /*******************************************************************/ 75 76 static int is_device_present(acpi_handle handle) 77 { 78 acpi_handle temp; 79 acpi_status status; 80 unsigned long long sta; 81 82 83 status = acpi_get_handle(handle, "_STA", &temp); 84 if (ACPI_FAILURE(status)) 85 return 1; /* _STA not found, assume device present */ 86 87 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 88 if (ACPI_FAILURE(status)) 89 return 0; /* Firmware error */ 90 91 return ((sta & ACPI_STA_DEVICE_PRESENT) == ACPI_STA_DEVICE_PRESENT); 92 } 93 94 /*******************************************************************/ 95 static int acpi_container_add(struct acpi_device *device) 96 { 97 struct acpi_container *container; 98 99 100 if (!device) { 101 printk(KERN_ERR PREFIX "device is NULL\n"); 102 return -EINVAL; 103 } 104 105 container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL); 106 if (!container) 107 return -ENOMEM; 108 109 container->handle = device->handle; 110 strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME); 111 strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS); 112 device->driver_data = container; 113 114 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n", 115 acpi_device_name(device), acpi_device_bid(device))); 116 117 return 0; 118 } 119 120 static int acpi_container_remove(struct acpi_device *device, int type) 121 { 122 acpi_status status = AE_OK; 123 struct acpi_container *pc = NULL; 124 125 pc = acpi_driver_data(device); 126 kfree(pc); 127 return status; 128 } 129 130 static int container_device_add(struct acpi_device **device, acpi_handle handle) 131 { 132 acpi_handle phandle; 133 struct acpi_device *pdev; 134 int result; 135 136 137 if (acpi_get_parent(handle, &phandle)) { 138 return -ENODEV; 139 } 140 141 if (acpi_bus_get_device(phandle, &pdev)) { 142 return -ENODEV; 143 } 144 145 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) { 146 return -ENODEV; 147 } 148 149 result = acpi_bus_start(*device); 150 151 return result; 152 } 153 154 static void container_notify_cb(acpi_handle handle, u32 type, void *context) 155 { 156 struct acpi_device *device = NULL; 157 int result; 158 int present; 159 acpi_status status; 160 161 162 present = is_device_present(handle); 163 164 switch (type) { 165 case ACPI_NOTIFY_BUS_CHECK: 166 /* Fall through */ 167 case ACPI_NOTIFY_DEVICE_CHECK: 168 printk(KERN_WARNING "Container driver received %s event\n", 169 (type == ACPI_NOTIFY_BUS_CHECK) ? 170 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"); 171 status = acpi_bus_get_device(handle, &device); 172 if (present) { 173 if (ACPI_FAILURE(status) || !device) { 174 result = container_device_add(&device, handle); 175 if (!result) 176 kobject_uevent(&device->dev.kobj, 177 KOBJ_ONLINE); 178 else 179 printk(KERN_WARNING 180 "Failed to add container\n"); 181 } 182 } else { 183 if (ACPI_SUCCESS(status)) { 184 /* device exist and this is a remove request */ 185 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 186 } 187 } 188 break; 189 case ACPI_NOTIFY_EJECT_REQUEST: 190 if (!acpi_bus_get_device(handle, &device) && device) { 191 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 192 } 193 break; 194 default: 195 break; 196 } 197 return; 198 } 199 200 static acpi_status 201 container_walk_namespace_cb(acpi_handle handle, 202 u32 lvl, void *context, void **rv) 203 { 204 char *hid = NULL; 205 struct acpi_device_info *info; 206 acpi_status status; 207 int *action = context; 208 209 status = acpi_get_object_info(handle, &info); 210 if (ACPI_FAILURE(status)) { 211 return AE_OK; 212 } 213 214 if (info->valid & ACPI_VALID_HID) 215 hid = info->hardware_id.string; 216 217 if (hid == NULL) { 218 goto end; 219 } 220 221 if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") && 222 strcmp(hid, "PNP0A06")) { 223 goto end; 224 } 225 226 switch (*action) { 227 case INSTALL_NOTIFY_HANDLER: 228 acpi_install_notify_handler(handle, 229 ACPI_SYSTEM_NOTIFY, 230 container_notify_cb, NULL); 231 break; 232 case UNINSTALL_NOTIFY_HANDLER: 233 acpi_remove_notify_handler(handle, 234 ACPI_SYSTEM_NOTIFY, 235 container_notify_cb); 236 break; 237 default: 238 break; 239 } 240 241 end: 242 kfree(info); 243 244 return AE_OK; 245 } 246 247 static int __init acpi_container_init(void) 248 { 249 int result = 0; 250 int action = INSTALL_NOTIFY_HANDLER; 251 252 result = acpi_bus_register_driver(&acpi_container_driver); 253 if (result < 0) { 254 return (result); 255 } 256 257 /* register notify handler to every container device */ 258 acpi_walk_namespace(ACPI_TYPE_DEVICE, 259 ACPI_ROOT_OBJECT, 260 ACPI_UINT32_MAX, 261 container_walk_namespace_cb, NULL, &action, NULL); 262 263 return (0); 264 } 265 266 static void __exit acpi_container_exit(void) 267 { 268 int action = UNINSTALL_NOTIFY_HANDLER; 269 270 271 acpi_walk_namespace(ACPI_TYPE_DEVICE, 272 ACPI_ROOT_OBJECT, 273 ACPI_UINT32_MAX, 274 container_walk_namespace_cb, NULL, &action, NULL); 275 276 acpi_bus_unregister_driver(&acpi_container_driver); 277 278 return; 279 } 280 281 module_init(acpi_container_init); 282 module_exit(acpi_container_exit); 283