11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * acpi_container.c - ACPI Generic Container Driver 31da177e4SLinus Torvalds * ($Revision: ) 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * Copyright (C) 2004 Anil S Keshavamurthy (anil.s.keshavamurthy@intel.com) 61da177e4SLinus Torvalds * Copyright (C) 2004 Keiichiro Tokunaga (tokunaga.keiich@jp.fujitsu.com) 71da177e4SLinus Torvalds * Copyright (C) 2004 Motoyuki Ito (motoyuki@soft.fujitsu.com) 81da177e4SLinus Torvalds * Copyright (C) 2004 Intel Corp. 91da177e4SLinus Torvalds * Copyright (C) 2004 FUJITSU LIMITED 101da177e4SLinus Torvalds * 111da177e4SLinus Torvalds * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 121da177e4SLinus Torvalds * 131da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify 141da177e4SLinus Torvalds * it under the terms of the GNU General Public License as published by 151da177e4SLinus Torvalds * the Free Software Foundation; either version 2 of the License, or (at 161da177e4SLinus Torvalds * your option) any later version. 171da177e4SLinus Torvalds * 181da177e4SLinus Torvalds * This program is distributed in the hope that it will be useful, but 191da177e4SLinus Torvalds * WITHOUT ANY WARRANTY; without even the implied warranty of 201da177e4SLinus Torvalds * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 211da177e4SLinus Torvalds * General Public License for more details. 221da177e4SLinus Torvalds * 231da177e4SLinus Torvalds * You should have received a copy of the GNU General Public License along 241da177e4SLinus Torvalds * with this program; if not, write to the Free Software Foundation, Inc., 251da177e4SLinus Torvalds * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. 261da177e4SLinus Torvalds * 271da177e4SLinus Torvalds * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 281da177e4SLinus Torvalds */ 291da177e4SLinus Torvalds #include <linux/kernel.h> 301da177e4SLinus Torvalds #include <linux/module.h> 311da177e4SLinus Torvalds #include <linux/init.h> 321da177e4SLinus Torvalds #include <linux/types.h> 331da177e4SLinus Torvalds #include <linux/acpi.h> 341da177e4SLinus Torvalds #include <acpi/acpi_bus.h> 351da177e4SLinus Torvalds #include <acpi/acpi_drivers.h> 361da177e4SLinus Torvalds #include <acpi/container.h> 371da177e4SLinus Torvalds 381da177e4SLinus Torvalds #define ACPI_CONTAINER_DRIVER_NAME "ACPI container driver" 391da177e4SLinus Torvalds #define ACPI_CONTAINER_DEVICE_NAME "ACPI container device" 401da177e4SLinus Torvalds #define ACPI_CONTAINER_CLASS "container" 411da177e4SLinus Torvalds 421da177e4SLinus Torvalds #define INSTALL_NOTIFY_HANDLER 1 431da177e4SLinus Torvalds #define UNINSTALL_NOTIFY_HANDLER 2 441da177e4SLinus Torvalds 451da177e4SLinus Torvalds #define ACPI_CONTAINER_COMPONENT 0x01000000 461da177e4SLinus Torvalds #define _COMPONENT ACPI_CONTAINER_COMPONENT 471da177e4SLinus Torvalds ACPI_MODULE_NAME("acpi_container") 481da177e4SLinus Torvalds 491da177e4SLinus Torvalds MODULE_AUTHOR("Anil S Keshavamurthy"); 501da177e4SLinus Torvalds MODULE_DESCRIPTION(ACPI_CONTAINER_DRIVER_NAME); 511da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 521da177e4SLinus Torvalds 531da177e4SLinus Torvalds #define ACPI_STA_PRESENT (0x00000001) 541da177e4SLinus Torvalds 551da177e4SLinus Torvalds static int acpi_container_add(struct acpi_device *device); 561da177e4SLinus Torvalds static int acpi_container_remove(struct acpi_device *device, int type); 571da177e4SLinus Torvalds 581da177e4SLinus Torvalds static struct acpi_driver acpi_container_driver = { 591da177e4SLinus Torvalds .name = ACPI_CONTAINER_DRIVER_NAME, 601da177e4SLinus Torvalds .class = ACPI_CONTAINER_CLASS, 611da177e4SLinus Torvalds .ids = "ACPI0004,PNP0A05,PNP0A06", 621da177e4SLinus Torvalds .ops = { 631da177e4SLinus Torvalds .add = acpi_container_add, 641da177e4SLinus Torvalds .remove = acpi_container_remove, 651da177e4SLinus Torvalds }, 661da177e4SLinus Torvalds }; 671da177e4SLinus Torvalds 681da177e4SLinus Torvalds /*******************************************************************/ 691da177e4SLinus Torvalds 704be44fcdSLen Brown static int is_device_present(acpi_handle handle) 711da177e4SLinus Torvalds { 721da177e4SLinus Torvalds acpi_handle temp; 731da177e4SLinus Torvalds acpi_status status; 741da177e4SLinus Torvalds unsigned long sta; 751da177e4SLinus Torvalds 761da177e4SLinus Torvalds ACPI_FUNCTION_TRACE("is_device_present"); 771da177e4SLinus Torvalds 781da177e4SLinus Torvalds status = acpi_get_handle(handle, "_STA", &temp); 791da177e4SLinus Torvalds if (ACPI_FAILURE(status)) 801da177e4SLinus Torvalds return_VALUE(1); /* _STA not found, assmue device present */ 811da177e4SLinus Torvalds 821da177e4SLinus Torvalds status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 831da177e4SLinus Torvalds if (ACPI_FAILURE(status)) 841da177e4SLinus Torvalds return_VALUE(0); /* Firmware error */ 851da177e4SLinus Torvalds 861da177e4SLinus Torvalds return_VALUE((sta & ACPI_STA_PRESENT) == ACPI_STA_PRESENT); 871da177e4SLinus Torvalds } 881da177e4SLinus Torvalds 891da177e4SLinus Torvalds /*******************************************************************/ 904be44fcdSLen Brown static int acpi_container_add(struct acpi_device *device) 911da177e4SLinus Torvalds { 921da177e4SLinus Torvalds struct acpi_container *container; 931da177e4SLinus Torvalds 941da177e4SLinus Torvalds ACPI_FUNCTION_TRACE("acpi_container_add"); 951da177e4SLinus Torvalds 961da177e4SLinus Torvalds if (!device) { 971da177e4SLinus Torvalds ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "device is NULL\n")); 981da177e4SLinus Torvalds return_VALUE(-EINVAL); 991da177e4SLinus Torvalds } 1001da177e4SLinus Torvalds 1011da177e4SLinus Torvalds container = kmalloc(sizeof(struct acpi_container), GFP_KERNEL); 1021da177e4SLinus Torvalds if (!container) 1031da177e4SLinus Torvalds return_VALUE(-ENOMEM); 1041da177e4SLinus Torvalds 1051da177e4SLinus Torvalds memset(container, 0, sizeof(struct acpi_container)); 1061da177e4SLinus Torvalds container->handle = device->handle; 1071da177e4SLinus Torvalds strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME); 1081da177e4SLinus Torvalds strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS); 1091da177e4SLinus Torvalds acpi_driver_data(device) = container; 1101da177e4SLinus Torvalds 1114be44fcdSLen Brown ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n", 1121da177e4SLinus Torvalds acpi_device_name(device), acpi_device_bid(device))); 1131da177e4SLinus Torvalds 1141da177e4SLinus Torvalds return_VALUE(0); 1151da177e4SLinus Torvalds } 1161da177e4SLinus Torvalds 1174be44fcdSLen Brown static int acpi_container_remove(struct acpi_device *device, int type) 1181da177e4SLinus Torvalds { 1191da177e4SLinus Torvalds acpi_status status = AE_OK; 1201da177e4SLinus Torvalds struct acpi_container *pc = NULL; 1216044ec88SJesper Juhl 1221da177e4SLinus Torvalds pc = (struct acpi_container *)acpi_driver_data(device); 1231da177e4SLinus Torvalds kfree(pc); 1241da177e4SLinus Torvalds return status; 1251da177e4SLinus Torvalds } 1261da177e4SLinus Torvalds 1274be44fcdSLen Brown static int container_device_add(struct acpi_device **device, acpi_handle handle) 1281da177e4SLinus Torvalds { 1291da177e4SLinus Torvalds acpi_handle phandle; 1301da177e4SLinus Torvalds struct acpi_device *pdev; 1311da177e4SLinus Torvalds int result; 1321da177e4SLinus Torvalds 1331da177e4SLinus Torvalds ACPI_FUNCTION_TRACE("container_device_add"); 1341da177e4SLinus Torvalds 1351da177e4SLinus Torvalds if (acpi_get_parent(handle, &phandle)) { 1361da177e4SLinus Torvalds return_VALUE(-ENODEV); 1371da177e4SLinus Torvalds } 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds if (acpi_bus_get_device(phandle, &pdev)) { 1401da177e4SLinus Torvalds return_VALUE(-ENODEV); 1411da177e4SLinus Torvalds } 1421da177e4SLinus Torvalds 1431da177e4SLinus Torvalds if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) { 1441da177e4SLinus Torvalds return_VALUE(-ENODEV); 1451da177e4SLinus Torvalds } 1461da177e4SLinus Torvalds 1473fb02738SRajesh Shah result = acpi_bus_start(*device); 1481da177e4SLinus Torvalds 1491da177e4SLinus Torvalds return_VALUE(result); 1501da177e4SLinus Torvalds } 1511da177e4SLinus Torvalds 1524be44fcdSLen Brown static void container_notify_cb(acpi_handle handle, u32 type, void *context) 1531da177e4SLinus Torvalds { 1541da177e4SLinus Torvalds struct acpi_device *device = NULL; 1551da177e4SLinus Torvalds int result; 1561da177e4SLinus Torvalds int present; 1571da177e4SLinus Torvalds acpi_status status; 1581da177e4SLinus Torvalds 1591da177e4SLinus Torvalds ACPI_FUNCTION_TRACE("container_notify_cb"); 1601da177e4SLinus Torvalds 1611da177e4SLinus Torvalds present = is_device_present(handle); 1621da177e4SLinus Torvalds 1631da177e4SLinus Torvalds switch (type) { 1641da177e4SLinus Torvalds case ACPI_NOTIFY_BUS_CHECK: 1651da177e4SLinus Torvalds /* Fall through */ 1661da177e4SLinus Torvalds case ACPI_NOTIFY_DEVICE_CHECK: 1671da177e4SLinus Torvalds printk("Container driver received %s event\n", 1681da177e4SLinus Torvalds (type == ACPI_NOTIFY_BUS_CHECK) ? 1691da177e4SLinus Torvalds "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"); 1701da177e4SLinus Torvalds status = acpi_bus_get_device(handle, &device); 1711da177e4SLinus Torvalds if (present) { 1721da177e4SLinus Torvalds if (ACPI_FAILURE(status) || !device) { 1731da177e4SLinus Torvalds result = container_device_add(&device, handle); 1741da177e4SLinus Torvalds if (!result) 1751da177e4SLinus Torvalds kobject_hotplug(&device->kobj, 1761da177e4SLinus Torvalds KOBJ_ONLINE); 1771da177e4SLinus Torvalds else 1781da177e4SLinus Torvalds printk("Failed to add container\n"); 1791da177e4SLinus Torvalds } 1801da177e4SLinus Torvalds } else { 1811da177e4SLinus Torvalds if (ACPI_SUCCESS(status)) { 1821da177e4SLinus Torvalds /* device exist and this is a remove request */ 1831da177e4SLinus Torvalds kobject_hotplug(&device->kobj, KOBJ_OFFLINE); 1841da177e4SLinus Torvalds } 1851da177e4SLinus Torvalds } 1861da177e4SLinus Torvalds break; 1871da177e4SLinus Torvalds case ACPI_NOTIFY_EJECT_REQUEST: 1881da177e4SLinus Torvalds if (!acpi_bus_get_device(handle, &device) && device) { 1891da177e4SLinus Torvalds kobject_hotplug(&device->kobj, KOBJ_OFFLINE); 1901da177e4SLinus Torvalds } 1911da177e4SLinus Torvalds break; 1921da177e4SLinus Torvalds default: 1931da177e4SLinus Torvalds break; 1941da177e4SLinus Torvalds } 1951da177e4SLinus Torvalds return_VOID; 1961da177e4SLinus Torvalds } 1971da177e4SLinus Torvalds 1981da177e4SLinus Torvalds static acpi_status 1991da177e4SLinus Torvalds container_walk_namespace_cb(acpi_handle handle, 2004be44fcdSLen Brown u32 lvl, void *context, void **rv) 2011da177e4SLinus Torvalds { 2021da177e4SLinus Torvalds char *hid = NULL; 2031da177e4SLinus Torvalds struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 2041da177e4SLinus Torvalds struct acpi_device_info *info; 2051da177e4SLinus Torvalds acpi_status status; 2061da177e4SLinus Torvalds int *action = context; 2071da177e4SLinus Torvalds 2081da177e4SLinus Torvalds ACPI_FUNCTION_TRACE("container_walk_namespace_cb"); 2091da177e4SLinus Torvalds 2101da177e4SLinus Torvalds status = acpi_get_object_info(handle, &buffer); 2111da177e4SLinus Torvalds if (ACPI_FAILURE(status) || !buffer.pointer) { 2121da177e4SLinus Torvalds return_ACPI_STATUS(AE_OK); 2131da177e4SLinus Torvalds } 2141da177e4SLinus Torvalds 2151da177e4SLinus Torvalds info = buffer.pointer; 2161da177e4SLinus Torvalds if (info->valid & ACPI_VALID_HID) 2171da177e4SLinus Torvalds hid = info->hardware_id.value; 2181da177e4SLinus Torvalds 2191da177e4SLinus Torvalds if (hid == NULL) { 2201da177e4SLinus Torvalds goto end; 2211da177e4SLinus Torvalds } 2221da177e4SLinus Torvalds 2231da177e4SLinus Torvalds if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") && 2241da177e4SLinus Torvalds strcmp(hid, "PNP0A06")) { 2251da177e4SLinus Torvalds goto end; 2261da177e4SLinus Torvalds } 2271da177e4SLinus Torvalds 2281da177e4SLinus Torvalds switch (*action) { 2291da177e4SLinus Torvalds case INSTALL_NOTIFY_HANDLER: 2301da177e4SLinus Torvalds acpi_install_notify_handler(handle, 2311da177e4SLinus Torvalds ACPI_SYSTEM_NOTIFY, 2324be44fcdSLen Brown container_notify_cb, NULL); 2331da177e4SLinus Torvalds break; 2341da177e4SLinus Torvalds case UNINSTALL_NOTIFY_HANDLER: 2351da177e4SLinus Torvalds acpi_remove_notify_handler(handle, 2361da177e4SLinus Torvalds ACPI_SYSTEM_NOTIFY, 2371da177e4SLinus Torvalds container_notify_cb); 2381da177e4SLinus Torvalds break; 2391da177e4SLinus Torvalds default: 2401da177e4SLinus Torvalds break; 2411da177e4SLinus Torvalds } 2421da177e4SLinus Torvalds 2431da177e4SLinus Torvalds end: 2441da177e4SLinus Torvalds acpi_os_free(buffer.pointer); 2451da177e4SLinus Torvalds 2461da177e4SLinus Torvalds return_ACPI_STATUS(AE_OK); 2471da177e4SLinus Torvalds } 2481da177e4SLinus Torvalds 2494be44fcdSLen Brown static int __init acpi_container_init(void) 2501da177e4SLinus Torvalds { 2511da177e4SLinus Torvalds int result = 0; 2521da177e4SLinus Torvalds int action = INSTALL_NOTIFY_HANDLER; 2531da177e4SLinus Torvalds 2541da177e4SLinus Torvalds result = acpi_bus_register_driver(&acpi_container_driver); 2551da177e4SLinus Torvalds if (result < 0) { 2561da177e4SLinus Torvalds return (result); 2571da177e4SLinus Torvalds } 2581da177e4SLinus Torvalds 2591da177e4SLinus Torvalds /* register notify handler to every container device */ 2601da177e4SLinus Torvalds acpi_walk_namespace(ACPI_TYPE_DEVICE, 2611da177e4SLinus Torvalds ACPI_ROOT_OBJECT, 2621da177e4SLinus Torvalds ACPI_UINT32_MAX, 2634be44fcdSLen Brown container_walk_namespace_cb, &action, NULL); 2641da177e4SLinus Torvalds 2651da177e4SLinus Torvalds return (0); 2661da177e4SLinus Torvalds } 2671da177e4SLinus Torvalds 2684be44fcdSLen Brown static void __exit acpi_container_exit(void) 2691da177e4SLinus Torvalds { 2701da177e4SLinus Torvalds int action = UNINSTALL_NOTIFY_HANDLER; 2711da177e4SLinus Torvalds 2721da177e4SLinus Torvalds ACPI_FUNCTION_TRACE("acpi_container_exit"); 2731da177e4SLinus Torvalds 2741da177e4SLinus Torvalds acpi_walk_namespace(ACPI_TYPE_DEVICE, 2751da177e4SLinus Torvalds ACPI_ROOT_OBJECT, 2761da177e4SLinus Torvalds ACPI_UINT32_MAX, 2774be44fcdSLen Brown container_walk_namespace_cb, &action, NULL); 2781da177e4SLinus Torvalds 2791da177e4SLinus Torvalds acpi_bus_unregister_driver(&acpi_container_driver); 2801da177e4SLinus Torvalds 2811da177e4SLinus Torvalds return_VOID; 2821da177e4SLinus Torvalds } 2831da177e4SLinus Torvalds 2841da177e4SLinus Torvalds module_init(acpi_container_init); 2851da177e4SLinus Torvalds module_exit(acpi_container_exit); 286