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 static bool is_container_device(const char *hid) 96 { 97 const struct acpi_device_id *container_id; 98 99 for (container_id = container_device_ids; 100 container_id->id[0]; container_id++) { 101 if (!strcmp((char *)container_id->id, hid)) 102 return true; 103 } 104 105 return false; 106 } 107 108 /*******************************************************************/ 109 static int acpi_container_add(struct acpi_device *device) 110 { 111 struct acpi_container *container; 112 113 container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL); 114 if (!container) 115 return -ENOMEM; 116 117 container->handle = device->handle; 118 strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME); 119 strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS); 120 device->driver_data = container; 121 122 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n", 123 acpi_device_name(device), acpi_device_bid(device))); 124 125 return 0; 126 } 127 128 static int acpi_container_remove(struct acpi_device *device, int type) 129 { 130 acpi_status status = AE_OK; 131 struct acpi_container *pc = NULL; 132 133 pc = acpi_driver_data(device); 134 kfree(pc); 135 return status; 136 } 137 138 static int container_device_add(struct acpi_device **device, acpi_handle handle) 139 { 140 acpi_handle phandle; 141 struct acpi_device *pdev; 142 int result; 143 144 145 if (acpi_get_parent(handle, &phandle)) { 146 return -ENODEV; 147 } 148 149 if (acpi_bus_get_device(phandle, &pdev)) { 150 return -ENODEV; 151 } 152 153 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) { 154 return -ENODEV; 155 } 156 157 result = acpi_bus_start(*device); 158 159 return result; 160 } 161 162 static void container_notify_cb(acpi_handle handle, u32 type, void *context) 163 { 164 struct acpi_device *device = NULL; 165 int result; 166 int present; 167 acpi_status status; 168 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */ 169 170 switch (type) { 171 case ACPI_NOTIFY_BUS_CHECK: 172 /* Fall through */ 173 case ACPI_NOTIFY_DEVICE_CHECK: 174 pr_debug("Container driver received %s event\n", 175 (type == ACPI_NOTIFY_BUS_CHECK) ? 176 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"); 177 178 present = is_device_present(handle); 179 status = acpi_bus_get_device(handle, &device); 180 if (!present) { 181 if (ACPI_SUCCESS(status)) { 182 /* device exist and this is a remove request */ 183 device->flags.eject_pending = 1; 184 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 185 return; 186 } 187 break; 188 } 189 190 if (!ACPI_FAILURE(status) || device) 191 break; 192 193 result = container_device_add(&device, handle); 194 if (result) { 195 acpi_handle_warn(handle, "Failed to add container\n"); 196 break; 197 } 198 199 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE); 200 ost_code = ACPI_OST_SC_SUCCESS; 201 break; 202 203 case ACPI_NOTIFY_EJECT_REQUEST: 204 if (!acpi_bus_get_device(handle, &device) && device) { 205 device->flags.eject_pending = 1; 206 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 207 return; 208 } 209 break; 210 211 default: 212 /* non-hotplug event; possibly handled by other handler */ 213 return; 214 } 215 216 /* Inform firmware that the hotplug operation has completed */ 217 (void) acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL); 218 return; 219 } 220 221 static acpi_status 222 container_walk_namespace_cb(acpi_handle handle, 223 u32 lvl, void *context, void **rv) 224 { 225 char *hid = NULL; 226 struct acpi_device_info *info; 227 acpi_status status; 228 int *action = context; 229 230 status = acpi_get_object_info(handle, &info); 231 if (ACPI_FAILURE(status)) { 232 return AE_OK; 233 } 234 235 if (info->valid & ACPI_VALID_HID) 236 hid = info->hardware_id.string; 237 238 if (hid == NULL) { 239 goto end; 240 } 241 242 if (!is_container_device(hid)) 243 goto end; 244 245 switch (*action) { 246 case INSTALL_NOTIFY_HANDLER: 247 acpi_install_notify_handler(handle, 248 ACPI_SYSTEM_NOTIFY, 249 container_notify_cb, NULL); 250 break; 251 case UNINSTALL_NOTIFY_HANDLER: 252 acpi_remove_notify_handler(handle, 253 ACPI_SYSTEM_NOTIFY, 254 container_notify_cb); 255 break; 256 default: 257 break; 258 } 259 260 end: 261 kfree(info); 262 263 return AE_OK; 264 } 265 266 static int __init acpi_container_init(void) 267 { 268 int result = 0; 269 int action = INSTALL_NOTIFY_HANDLER; 270 271 result = acpi_bus_register_driver(&acpi_container_driver); 272 if (result < 0) { 273 return (result); 274 } 275 276 /* register notify handler to every container device */ 277 acpi_walk_namespace(ACPI_TYPE_DEVICE, 278 ACPI_ROOT_OBJECT, 279 ACPI_UINT32_MAX, 280 container_walk_namespace_cb, NULL, &action, NULL); 281 282 return (0); 283 } 284 285 static void __exit acpi_container_exit(void) 286 { 287 int action = UNINSTALL_NOTIFY_HANDLER; 288 289 290 acpi_walk_namespace(ACPI_TYPE_DEVICE, 291 ACPI_ROOT_OBJECT, 292 ACPI_UINT32_MAX, 293 container_walk_namespace_cb, NULL, &action, NULL); 294 295 acpi_bus_unregister_driver(&acpi_container_driver); 296 297 return; 298 } 299 300 module_init(acpi_container_init); 301 module_exit(acpi_container_exit); 302