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 38 #include "internal.h" 39 40 #define PREFIX "ACPI: " 41 42 #define _COMPONENT ACPI_CONTAINER_COMPONENT 43 ACPI_MODULE_NAME("container"); 44 45 static const struct acpi_device_id container_device_ids[] = { 46 {"ACPI0004", 0}, 47 {"PNP0A05", 0}, 48 {"PNP0A06", 0}, 49 {"", 0}, 50 }; 51 52 static int container_device_attach(struct acpi_device *device, 53 const struct acpi_device_id *not_used) 54 { 55 /* 56 * FIXME: This is necessary, so that acpi_eject_store() doesn't return 57 * -ENODEV for containers. 58 */ 59 return 1; 60 } 61 62 static struct acpi_scan_handler container_device_handler = { 63 .ids = container_device_ids, 64 .attach = container_device_attach, 65 }; 66 67 static int is_device_present(acpi_handle handle) 68 { 69 acpi_handle temp; 70 acpi_status status; 71 unsigned long long sta; 72 73 74 status = acpi_get_handle(handle, "_STA", &temp); 75 if (ACPI_FAILURE(status)) 76 return 1; /* _STA not found, assume device present */ 77 78 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 79 if (ACPI_FAILURE(status)) 80 return 0; /* Firmware error */ 81 82 return ((sta & ACPI_STA_DEVICE_PRESENT) == ACPI_STA_DEVICE_PRESENT); 83 } 84 85 static void container_notify_cb(acpi_handle handle, u32 type, void *context) 86 { 87 struct acpi_device *device = NULL; 88 int result; 89 int present; 90 acpi_status status; 91 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */ 92 93 acpi_scan_lock_acquire(); 94 95 switch (type) { 96 case ACPI_NOTIFY_BUS_CHECK: 97 /* Fall through */ 98 case ACPI_NOTIFY_DEVICE_CHECK: 99 pr_debug("Container driver received %s event\n", 100 (type == ACPI_NOTIFY_BUS_CHECK) ? 101 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"); 102 103 present = is_device_present(handle); 104 status = acpi_bus_get_device(handle, &device); 105 if (!present) { 106 if (ACPI_SUCCESS(status)) { 107 /* device exist and this is a remove request */ 108 device->flags.eject_pending = 1; 109 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 110 goto out; 111 } 112 break; 113 } 114 115 if (!ACPI_FAILURE(status) || device) 116 break; 117 118 result = acpi_bus_scan(handle); 119 if (result) { 120 acpi_handle_warn(handle, "Failed to add container\n"); 121 break; 122 } 123 result = acpi_bus_get_device(handle, &device); 124 if (result) { 125 acpi_handle_warn(handle, "Missing device object\n"); 126 break; 127 } 128 129 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE); 130 ost_code = ACPI_OST_SC_SUCCESS; 131 break; 132 133 case ACPI_NOTIFY_EJECT_REQUEST: 134 if (!acpi_bus_get_device(handle, &device) && device) { 135 device->flags.eject_pending = 1; 136 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 137 goto out; 138 } 139 break; 140 141 default: 142 /* non-hotplug event; possibly handled by other handler */ 143 goto out; 144 } 145 146 /* Inform firmware that the hotplug operation has completed */ 147 (void) acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL); 148 149 out: 150 acpi_scan_lock_release(); 151 } 152 153 static bool is_container(acpi_handle handle) 154 { 155 struct acpi_device_info *info; 156 bool ret = false; 157 158 if (ACPI_FAILURE(acpi_get_object_info(handle, &info))) 159 return false; 160 161 if (info->valid & ACPI_VALID_HID) { 162 const struct acpi_device_id *id; 163 164 for (id = container_device_ids; id->id[0]; id++) { 165 ret = !strcmp((char *)id->id, info->hardware_id.string); 166 if (ret) 167 break; 168 } 169 } 170 kfree(info); 171 return ret; 172 } 173 174 static acpi_status acpi_container_register_notify_handler(acpi_handle handle, 175 u32 lvl, void *ctxt, 176 void **retv) 177 { 178 if (is_container(handle)) 179 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, 180 container_notify_cb, NULL); 181 182 return AE_OK; 183 } 184 185 void __init acpi_container_init(void) 186 { 187 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX, 188 acpi_container_register_notify_handler, NULL, 189 NULL, NULL); 190 191 acpi_scan_add_handler(&container_device_handler); 192 } 193