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/slab.h> 33 #include <linux/types.h> 34 #include <linux/acpi.h> 35 #include <acpi/acpi_bus.h> 36 #include <acpi/acpi_drivers.h> 37 #include <acpi/container.h> 38 39 #define PREFIX "ACPI: " 40 41 #define ACPI_CONTAINER_DEVICE_NAME "ACPI container device" 42 #define ACPI_CONTAINER_CLASS "container" 43 44 #define INSTALL_NOTIFY_HANDLER 1 45 #define UNINSTALL_NOTIFY_HANDLER 2 46 47 #define _COMPONENT ACPI_CONTAINER_COMPONENT 48 ACPI_MODULE_NAME("container"); 49 50 MODULE_AUTHOR("Anil S Keshavamurthy"); 51 MODULE_DESCRIPTION("ACPI container driver"); 52 MODULE_LICENSE("GPL"); 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 const struct acpi_device_id container_device_ids[] = { 58 {"ACPI0004", 0}, 59 {"PNP0A05", 0}, 60 {"PNP0A06", 0}, 61 {"", 0}, 62 }; 63 MODULE_DEVICE_TABLE(acpi, container_device_ids); 64 65 static struct acpi_driver acpi_container_driver = { 66 .name = "container", 67 .class = ACPI_CONTAINER_CLASS, 68 .ids = container_device_ids, 69 .ops = { 70 .add = acpi_container_add, 71 .remove = acpi_container_remove, 72 }, 73 }; 74 75 /*******************************************************************/ 76 77 static int is_device_present(acpi_handle handle) 78 { 79 acpi_handle temp; 80 acpi_status status; 81 unsigned long long sta; 82 83 84 status = acpi_get_handle(handle, "_STA", &temp); 85 if (ACPI_FAILURE(status)) 86 return 1; /* _STA not found, assume device present */ 87 88 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 89 if (ACPI_FAILURE(status)) 90 return 0; /* Firmware error */ 91 92 return ((sta & ACPI_STA_DEVICE_PRESENT) == ACPI_STA_DEVICE_PRESENT); 93 } 94 95 /*******************************************************************/ 96 static int acpi_container_add(struct acpi_device *device) 97 { 98 struct acpi_container *container; 99 100 101 if (!device) { 102 printk(KERN_ERR PREFIX "device is NULL\n"); 103 return -EINVAL; 104 } 105 106 container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL); 107 if (!container) 108 return -ENOMEM; 109 110 container->handle = device->handle; 111 strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME); 112 strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS); 113 device->driver_data = container; 114 115 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n", 116 acpi_device_name(device), acpi_device_bid(device))); 117 118 return 0; 119 } 120 121 static int acpi_container_remove(struct acpi_device *device, int type) 122 { 123 acpi_status status = AE_OK; 124 struct acpi_container *pc = NULL; 125 126 pc = acpi_driver_data(device); 127 kfree(pc); 128 return status; 129 } 130 131 static int container_device_add(struct acpi_device **device, acpi_handle handle) 132 { 133 acpi_handle phandle; 134 struct acpi_device *pdev; 135 int result; 136 137 138 if (acpi_get_parent(handle, &phandle)) { 139 return -ENODEV; 140 } 141 142 if (acpi_bus_get_device(phandle, &pdev)) { 143 return -ENODEV; 144 } 145 146 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) { 147 return -ENODEV; 148 } 149 150 result = acpi_bus_start(*device); 151 152 return result; 153 } 154 155 static void container_notify_cb(acpi_handle handle, u32 type, void *context) 156 { 157 struct acpi_device *device = NULL; 158 int result; 159 int present; 160 acpi_status status; 161 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */ 162 163 switch (type) { 164 case ACPI_NOTIFY_BUS_CHECK: 165 /* Fall through */ 166 case ACPI_NOTIFY_DEVICE_CHECK: 167 printk(KERN_WARNING "Container driver received %s event\n", 168 (type == ACPI_NOTIFY_BUS_CHECK) ? 169 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"); 170 171 present = is_device_present(handle); 172 status = acpi_bus_get_device(handle, &device); 173 if (!present) { 174 if (ACPI_SUCCESS(status)) { 175 /* device exist and this is a remove request */ 176 device->flags.eject_pending = 1; 177 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 178 return; 179 } 180 break; 181 } 182 183 if (!ACPI_FAILURE(status) || device) 184 break; 185 186 result = container_device_add(&device, handle); 187 if (result) { 188 printk(KERN_WARNING "Failed to add container\n"); 189 break; 190 } 191 192 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE); 193 ost_code = ACPI_OST_SC_SUCCESS; 194 break; 195 196 case ACPI_NOTIFY_EJECT_REQUEST: 197 if (!acpi_bus_get_device(handle, &device) && device) { 198 device->flags.eject_pending = 1; 199 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 200 return; 201 } 202 break; 203 204 default: 205 /* non-hotplug event; possibly handled by other handler */ 206 return; 207 } 208 209 /* Inform firmware that the hotplug operation has completed */ 210 (void) acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL); 211 return; 212 } 213 214 static acpi_status 215 container_walk_namespace_cb(acpi_handle handle, 216 u32 lvl, void *context, void **rv) 217 { 218 char *hid = NULL; 219 struct acpi_device_info *info; 220 acpi_status status; 221 int *action = context; 222 223 status = acpi_get_object_info(handle, &info); 224 if (ACPI_FAILURE(status)) { 225 return AE_OK; 226 } 227 228 if (info->valid & ACPI_VALID_HID) 229 hid = info->hardware_id.string; 230 231 if (hid == NULL) { 232 goto end; 233 } 234 235 if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") && 236 strcmp(hid, "PNP0A06")) { 237 goto end; 238 } 239 240 switch (*action) { 241 case INSTALL_NOTIFY_HANDLER: 242 acpi_install_notify_handler(handle, 243 ACPI_SYSTEM_NOTIFY, 244 container_notify_cb, NULL); 245 break; 246 case UNINSTALL_NOTIFY_HANDLER: 247 acpi_remove_notify_handler(handle, 248 ACPI_SYSTEM_NOTIFY, 249 container_notify_cb); 250 break; 251 default: 252 break; 253 } 254 255 end: 256 kfree(info); 257 258 return AE_OK; 259 } 260 261 static int __init acpi_container_init(void) 262 { 263 int result = 0; 264 int action = INSTALL_NOTIFY_HANDLER; 265 266 result = acpi_bus_register_driver(&acpi_container_driver); 267 if (result < 0) { 268 return (result); 269 } 270 271 /* register notify handler to every container device */ 272 acpi_walk_namespace(ACPI_TYPE_DEVICE, 273 ACPI_ROOT_OBJECT, 274 ACPI_UINT32_MAX, 275 container_walk_namespace_cb, NULL, &action, NULL); 276 277 return (0); 278 } 279 280 static void __exit acpi_container_exit(void) 281 { 282 int action = UNINSTALL_NOTIFY_HANDLER; 283 284 285 acpi_walk_namespace(ACPI_TYPE_DEVICE, 286 ACPI_ROOT_OBJECT, 287 ACPI_UINT32_MAX, 288 container_walk_namespace_cb, NULL, &action, NULL); 289 290 acpi_bus_unregister_driver(&acpi_container_driver); 291 292 return; 293 } 294 295 module_init(acpi_container_init); 296 module_exit(acpi_container_exit); 297