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