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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090032#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#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
Len Browna192a952009-07-28 16:45:54 -040039#define PREFIX "ACPI: "
40
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#define ACPI_CONTAINER_DEVICE_NAME "ACPI container device"
42#define ACPI_CONTAINER_CLASS "container"
43
44#define INSTALL_NOTIFY_HANDLER 1
45#define UNINSTALL_NOTIFY_HANDLER 2
46
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#define _COMPONENT ACPI_CONTAINER_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050048ACPI_MODULE_NAME("container");
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
Len Brownf52fd662007-02-12 22:42:12 -050050MODULE_AUTHOR("Anil S Keshavamurthy");
Len Brown7cda93e2007-02-12 23:50:02 -050051MODULE_DESCRIPTION("ACPI container driver");
Linus Torvalds1da177e2005-04-16 15:20:36 -070052MODULE_LICENSE("GPL");
53
Linus Torvalds1da177e2005-04-16 15:20:36 -070054static int acpi_container_add(struct acpi_device *device);
55static int acpi_container_remove(struct acpi_device *device, int type);
56
Thomas Renninger1ba90e32007-07-23 14:44:41 +020057static const struct acpi_device_id container_device_ids[] = {
58 {"ACPI0004", 0},
59 {"PNP0A05", 0},
60 {"PNP0A06", 0},
61 {"", 0},
62};
63MODULE_DEVICE_TABLE(acpi, container_device_ids);
64
Linus Torvalds1da177e2005-04-16 15:20:36 -070065static struct acpi_driver acpi_container_driver = {
Len Brownc2b6705b2007-02-12 23:33:40 -050066 .name = "container",
Len Brown4be44fc2005-08-05 00:44:28 -040067 .class = ACPI_CONTAINER_CLASS,
Thomas Renninger1ba90e32007-07-23 14:44:41 +020068 .ids = container_device_ids,
Len Brown4be44fc2005-08-05 00:44:28 -040069 .ops = {
70 .add = acpi_container_add,
71 .remove = acpi_container_remove,
72 },
Linus Torvalds1da177e2005-04-16 15:20:36 -070073};
74
Linus Torvalds1da177e2005-04-16 15:20:36 -070075/*******************************************************************/
76
Len Brown4be44fc2005-08-05 00:44:28 -040077static int is_device_present(acpi_handle handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -070078{
Len Brown4be44fc2005-08-05 00:44:28 -040079 acpi_handle temp;
80 acpi_status status;
Matthew Wilcox27663c52008-10-10 02:22:59 -040081 unsigned long long sta;
Linus Torvalds1da177e2005-04-16 15:20:36 -070082
Linus Torvalds1da177e2005-04-16 15:20:36 -070083
84 status = acpi_get_handle(handle, "_STA", &temp);
85 if (ACPI_FAILURE(status))
Bjorn Helgaasa0bd4ac2007-04-25 14:17:39 -040086 return 1; /* _STA not found, assume device present */
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
88 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
89 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -040090 return 0; /* Firmware error */
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
Bjorn Helgaasa0bd4ac2007-04-25 14:17:39 -040092 return ((sta & ACPI_STA_DEVICE_PRESENT) == ACPI_STA_DEVICE_PRESENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -070093}
94
95/*******************************************************************/
Len Brown4be44fc2005-08-05 00:44:28 -040096static int acpi_container_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -070097{
98 struct acpi_container *container;
99
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
101 if (!device) {
Len Brown64684632006-06-26 23:41:38 -0400102 printk(KERN_ERR PREFIX "device is NULL\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400103 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 }
105
Burman Yan36bcbec2006-12-19 12:56:11 -0800106 container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL);
Len Brown4be44fc2005-08-05 00:44:28 -0400107 if (!container)
Patrick Mocheld550d982006-06-27 00:41:40 -0400108 return -ENOMEM;
Len Brown4be44fc2005-08-05 00:44:28 -0400109
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 container->handle = device->handle;
111 strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
112 strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700113 device->driver_data = container;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
Len Brown4be44fc2005-08-05 00:44:28 -0400115 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",
116 acpi_device_name(device), acpi_device_bid(device)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117
Patrick Mocheld550d982006-06-27 00:41:40 -0400118 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119}
120
Len Brown4be44fc2005-08-05 00:44:28 -0400121static int acpi_container_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122{
Len Brown4be44fc2005-08-05 00:44:28 -0400123 acpi_status status = AE_OK;
124 struct acpi_container *pc = NULL;
Jesper Juhl6044ec82005-11-07 01:01:32 -0800125
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200126 pc = acpi_driver_data(device);
Jesper Juhl6044ec82005-11-07 01:01:32 -0800127 kfree(pc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 return status;
129}
130
Len Brown4be44fc2005-08-05 00:44:28 -0400131static int container_device_add(struct acpi_device **device, acpi_handle handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132{
133 acpi_handle phandle;
134 struct acpi_device *pdev;
135 int result;
136
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
138 if (acpi_get_parent(handle, &phandle)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400139 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 }
141
142 if (acpi_bus_get_device(phandle, &pdev)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400143 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 }
145
146 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400147 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 }
149
Rajesh Shah3fb02732005-04-28 00:25:52 -0700150 result = acpi_bus_start(*device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
Patrick Mocheld550d982006-06-27 00:41:40 -0400152 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153}
154
Len Brown4be44fc2005-08-05 00:44:28 -0400155static void container_notify_cb(acpi_handle handle, u32 type, void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156{
Len Brown4be44fc2005-08-05 00:44:28 -0400157 struct acpi_device *device = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 int result;
159 int present;
160 acpi_status status;
161
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162
163 present = is_device_present(handle);
Len Brown4be44fc2005-08-05 00:44:28 -0400164
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 switch (type) {
166 case ACPI_NOTIFY_BUS_CHECK:
167 /* Fall through */
168 case ACPI_NOTIFY_DEVICE_CHECK:
Frank Seidel4d939152009-02-04 17:03:07 +0100169 printk(KERN_WARNING "Container driver received %s event\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400170 (type == ACPI_NOTIFY_BUS_CHECK) ?
171 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 status = acpi_bus_get_device(handle, &device);
173 if (present) {
174 if (ACPI_FAILURE(status) || !device) {
175 result = container_device_add(&device, handle);
176 if (!result)
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800177 kobject_uevent(&device->dev.kobj,
Kay Sievers312c0042005-11-16 09:00:00 +0100178 KOBJ_ONLINE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 else
Frank Seidel4d939152009-02-04 17:03:07 +0100180 printk(KERN_WARNING
181 "Failed to add container\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 }
183 } else {
184 if (ACPI_SUCCESS(status)) {
185 /* device exist and this is a remove request */
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800186 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 }
188 }
189 break;
190 case ACPI_NOTIFY_EJECT_REQUEST:
191 if (!acpi_bus_get_device(handle, &device) && device) {
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800192 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 }
194 break;
195 default:
196 break;
197 }
Patrick Mocheld550d982006-06-27 00:41:40 -0400198 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199}
200
201static acpi_status
202container_walk_namespace_cb(acpi_handle handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400203 u32 lvl, void *context, void **rv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204{
Len Brown4be44fc2005-08-05 00:44:28 -0400205 char *hid = NULL;
Len Brown4be44fc2005-08-05 00:44:28 -0400206 struct acpi_device_info *info;
207 acpi_status status;
208 int *action = context;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209
Bob Moore15b8dd52009-06-29 13:39:29 +0800210 status = acpi_get_object_info(handle, &info);
211 if (ACPI_FAILURE(status)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400212 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 }
214
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 if (info->valid & ACPI_VALID_HID)
Bob Moore15b8dd52009-06-29 13:39:29 +0800216 hid = info->hardware_id.string;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
218 if (hid == NULL) {
219 goto end;
220 }
221
222 if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") &&
Len Brown4be44fc2005-08-05 00:44:28 -0400223 strcmp(hid, "PNP0A06")) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 goto end;
225 }
226
Len Brown4be44fc2005-08-05 00:44:28 -0400227 switch (*action) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 case INSTALL_NOTIFY_HANDLER:
229 acpi_install_notify_handler(handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400230 ACPI_SYSTEM_NOTIFY,
231 container_notify_cb, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 break;
233 case UNINSTALL_NOTIFY_HANDLER:
234 acpi_remove_notify_handler(handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400235 ACPI_SYSTEM_NOTIFY,
236 container_notify_cb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 break;
238 default:
239 break;
240 }
241
Len Brown4be44fc2005-08-05 00:44:28 -0400242 end:
Bob Moore15b8dd52009-06-29 13:39:29 +0800243 kfree(info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244
Patrick Mocheld550d982006-06-27 00:41:40 -0400245 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246}
247
Len Brown4be44fc2005-08-05 00:44:28 -0400248static int __init acpi_container_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249{
Len Brown4be44fc2005-08-05 00:44:28 -0400250 int result = 0;
251 int action = INSTALL_NOTIFY_HANDLER;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252
253 result = acpi_bus_register_driver(&acpi_container_driver);
254 if (result < 0) {
Len Brown4be44fc2005-08-05 00:44:28 -0400255 return (result);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 }
257
258 /* register notify handler to every container device */
259 acpi_walk_namespace(ACPI_TYPE_DEVICE,
Len Brown4be44fc2005-08-05 00:44:28 -0400260 ACPI_ROOT_OBJECT,
261 ACPI_UINT32_MAX,
Lin Ming22635762009-11-13 10:06:08 +0800262 container_walk_namespace_cb, NULL, &action, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263
Len Brown4be44fc2005-08-05 00:44:28 -0400264 return (0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265}
266
Len Brown4be44fc2005-08-05 00:44:28 -0400267static void __exit acpi_container_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268{
Len Brown4be44fc2005-08-05 00:44:28 -0400269 int action = UNINSTALL_NOTIFY_HANDLER;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
272 acpi_walk_namespace(ACPI_TYPE_DEVICE,
Len Brown4be44fc2005-08-05 00:44:28 -0400273 ACPI_ROOT_OBJECT,
274 ACPI_UINT32_MAX,
Lin Ming22635762009-11-13 10:06:08 +0800275 container_walk_namespace_cb, NULL, &action, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276
277 acpi_bus_unregister_driver(&acpi_container_driver);
278
Patrick Mocheld550d982006-06-27 00:41:40 -0400279 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280}
281
282module_init(acpi_container_init);
283module_exit(acpi_container_exit);