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