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 void container_notify_cb(acpi_handle handle, u32 type, void *context) 139 { 140 struct acpi_device *device = NULL; 141 int result; 142 int present; 143 acpi_status status; 144 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */ 145 146 switch (type) { 147 case ACPI_NOTIFY_BUS_CHECK: 148 /* Fall through */ 149 case ACPI_NOTIFY_DEVICE_CHECK: 150 pr_debug("Container driver received %s event\n", 151 (type == ACPI_NOTIFY_BUS_CHECK) ? 152 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"); 153 154 present = is_device_present(handle); 155 status = acpi_bus_get_device(handle, &device); 156 if (!present) { 157 if (ACPI_SUCCESS(status)) { 158 /* device exist and this is a remove request */ 159 device->flags.eject_pending = 1; 160 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 161 return; 162 } 163 break; 164 } 165 166 if (!ACPI_FAILURE(status) || device) 167 break; 168 169 result = acpi_bus_scan(handle); 170 if (result) { 171 acpi_handle_warn(handle, "Failed to add container\n"); 172 break; 173 } 174 result = acpi_bus_get_device(handle, &device); 175 if (result) { 176 acpi_handle_warn(handle, "Missing device object\n"); 177 break; 178 } 179 180 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE); 181 ost_code = ACPI_OST_SC_SUCCESS; 182 break; 183 184 case ACPI_NOTIFY_EJECT_REQUEST: 185 if (!acpi_bus_get_device(handle, &device) && device) { 186 device->flags.eject_pending = 1; 187 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 188 return; 189 } 190 break; 191 192 default: 193 /* non-hotplug event; possibly handled by other handler */ 194 return; 195 } 196 197 /* Inform firmware that the hotplug operation has completed */ 198 (void) acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL); 199 return; 200 } 201 202 static acpi_status 203 container_walk_namespace_cb(acpi_handle handle, 204 u32 lvl, void *context, void **rv) 205 { 206 char *hid = NULL; 207 struct acpi_device_info *info; 208 acpi_status status; 209 int *action = context; 210 211 status = acpi_get_object_info(handle, &info); 212 if (ACPI_FAILURE(status)) { 213 return AE_OK; 214 } 215 216 if (info->valid & ACPI_VALID_HID) 217 hid = info->hardware_id.string; 218 219 if (hid == NULL) { 220 goto end; 221 } 222 223 if (!is_container_device(hid)) 224 goto end; 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