/* * acpi_container.c - ACPI Generic Container Driver * ($Revision: ) * * Copyright (C) 2004 Anil S Keshavamurthy (anil.s.keshavamurthy@intel.com) * Copyright (C) 2004 Keiichiro Tokunaga (tokunaga.keiich@jp.fujitsu.com) * Copyright (C) 2004 Motoyuki Ito (motoyuki@soft.fujitsu.com) * Copyright (C) 2004 Intel Corp. * Copyright (C) 2004 FUJITSU LIMITED * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or (at * your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/types.h> #include <linux/acpi.h> #include <acpi/acpi_bus.h> #include <acpi/acpi_drivers.h> #include <acpi/container.h> #define ACPI_CONTAINER_DRIVER_NAME "ACPI container driver" #define ACPI_CONTAINER_DEVICE_NAME "ACPI container device" #define ACPI_CONTAINER_CLASS "container" #define INSTALL_NOTIFY_HANDLER 1 #define UNINSTALL_NOTIFY_HANDLER 2 #define ACPI_CONTAINER_COMPONENT 0x01000000 #define _COMPONENT ACPI_CONTAINER_COMPONENT ACPI_MODULE_NAME("acpi_container") MODULE_AUTHOR("Anil S Keshavamurthy"); MODULE_DESCRIPTION(ACPI_CONTAINER_DRIVER_NAME); MODULE_LICENSE("GPL"); #define ACPI_STA_PRESENT (0x00000001) static int acpi_container_add(struct acpi_device *device); static int acpi_container_remove(struct acpi_device *device, int type); static struct acpi_driver acpi_container_driver = { .name = ACPI_CONTAINER_DRIVER_NAME, .class = ACPI_CONTAINER_CLASS, .ids = "ACPI0004,PNP0A05,PNP0A06", .ops = { .add = acpi_container_add, .remove = acpi_container_remove, }, }; /*******************************************************************/ static int is_device_present(acpi_handle handle) { acpi_handle temp; acpi_status status; unsigned long sta; status = acpi_get_handle(handle, "_STA", &temp); if (ACPI_FAILURE(status)) return 1; /* _STA not found, assmue device present */ status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); if (ACPI_FAILURE(status)) return 0; /* Firmware error */ return ((sta & ACPI_STA_PRESENT) == ACPI_STA_PRESENT); } /*******************************************************************/ static int acpi_container_add(struct acpi_device *device) { struct acpi_container *container; if (!device) { printk(KERN_ERR PREFIX "device is NULL\n"); return -EINVAL; } container = kmalloc(sizeof(struct acpi_container), GFP_KERNEL); if (!container) return -ENOMEM; memset(container, 0, sizeof(struct acpi_container)); container->handle = device->handle; strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME); strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS); acpi_driver_data(device) = container; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n", acpi_device_name(device), acpi_device_bid(device))); return 0; } static int acpi_container_remove(struct acpi_device *device, int type) { acpi_status status = AE_OK; struct acpi_container *pc = NULL; pc = (struct acpi_container *)acpi_driver_data(device); kfree(pc); return status; } static int container_device_add(struct acpi_device **device, acpi_handle handle) { acpi_handle phandle; struct acpi_device *pdev; int result; if (acpi_get_parent(handle, &phandle)) { return -ENODEV; } if (acpi_bus_get_device(phandle, &pdev)) { return -ENODEV; } if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) { return -ENODEV; } result = acpi_bus_start(*device); return result; } static void container_notify_cb(acpi_handle handle, u32 type, void *context) { struct acpi_device *device = NULL; int result; int present; acpi_status status; present = is_device_present(handle); switch (type) { case ACPI_NOTIFY_BUS_CHECK: /* Fall through */ case ACPI_NOTIFY_DEVICE_CHECK: printk("Container driver received %s event\n", (type == ACPI_NOTIFY_BUS_CHECK) ? "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"); status = acpi_bus_get_device(handle, &device); if (present) { if (ACPI_FAILURE(status) || !device) { result = container_device_add(&device, handle); if (!result) kobject_uevent(&device->kobj, KOBJ_ONLINE); else printk("Failed to add container\n"); } } else { if (ACPI_SUCCESS(status)) { /* device exist and this is a remove request */ kobject_uevent(&device->kobj, KOBJ_OFFLINE); } } break; case ACPI_NOTIFY_EJECT_REQUEST: if (!acpi_bus_get_device(handle, &device) && device) { kobject_uevent(&device->kobj, KOBJ_OFFLINE); } break; default: break; } return; } static acpi_status container_walk_namespace_cb(acpi_handle handle, u32 lvl, void *context, void **rv) { char *hid = NULL; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; struct acpi_device_info *info; acpi_status status; int *action = context; status = acpi_get_object_info(handle, &buffer); if (ACPI_FAILURE(status) || !buffer.pointer) { return AE_OK; } info = buffer.pointer; if (info->valid & ACPI_VALID_HID) hid = info->hardware_id.value; if (hid == NULL) { goto end; } if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") && strcmp(hid, "PNP0A06")) { goto end; } switch (*action) { case INSTALL_NOTIFY_HANDLER: acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, container_notify_cb, NULL); break; case UNINSTALL_NOTIFY_HANDLER: acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY, container_notify_cb); break; default: break; } end: acpi_os_free(buffer.pointer); return AE_OK; } static int __init acpi_container_init(void) { int result = 0; int action = INSTALL_NOTIFY_HANDLER; result = acpi_bus_register_driver(&acpi_container_driver); if (result < 0) { return (result); } /* register notify handler to every container device */ acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX, container_walk_namespace_cb, &action, NULL); return (0); } static void __exit acpi_container_exit(void) { int action = UNINSTALL_NOTIFY_HANDLER; acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX, container_walk_namespace_cb, &action, NULL); acpi_bus_unregister_driver(&acpi_container_driver); return; } module_init(acpi_container_init); module_exit(acpi_container_exit);