blob: 871aa520ece78aaa50d94bbb90a29c3c9f4ef83b [file] [log] [blame]
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>
32#include <linux/types.h>
33#include <linux/acpi.h>
34#include <acpi/acpi_bus.h>
35#include <acpi/acpi_drivers.h>
36#include <acpi/container.h>
37
38#define ACPI_CONTAINER_DRIVER_NAME "ACPI container driver"
39#define ACPI_CONTAINER_DEVICE_NAME "ACPI container device"
40#define ACPI_CONTAINER_CLASS "container"
41
42#define INSTALL_NOTIFY_HANDLER 1
43#define UNINSTALL_NOTIFY_HANDLER 2
44
45#define ACPI_CONTAINER_COMPONENT 0x01000000
46#define _COMPONENT ACPI_CONTAINER_COMPONENT
Len Brown4be44fc2005-08-05 00:44:28 -040047ACPI_MODULE_NAME("acpi_container")
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
Len Brown4be44fc2005-08-05 00:44:28 -040049 MODULE_AUTHOR("Anil S Keshavamurthy");
Linus Torvalds1da177e2005-04-16 15:20:36 -070050MODULE_DESCRIPTION(ACPI_CONTAINER_DRIVER_NAME);
51MODULE_LICENSE("GPL");
52
53#define ACPI_STA_PRESENT (0x00000001)
54
55static int acpi_container_add(struct acpi_device *device);
56static int acpi_container_remove(struct acpi_device *device, int type);
57
58static struct acpi_driver acpi_container_driver = {
Len Brown4be44fc2005-08-05 00:44:28 -040059 .name = ACPI_CONTAINER_DRIVER_NAME,
60 .class = ACPI_CONTAINER_CLASS,
61 .ids = "ACPI0004,PNP0A05,PNP0A06",
62 .ops = {
63 .add = acpi_container_add,
64 .remove = acpi_container_remove,
65 },
Linus Torvalds1da177e2005-04-16 15:20:36 -070066};
67
Linus Torvalds1da177e2005-04-16 15:20:36 -070068/*******************************************************************/
69
Len Brown4be44fc2005-08-05 00:44:28 -040070static int is_device_present(acpi_handle handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -070071{
Len Brown4be44fc2005-08-05 00:44:28 -040072 acpi_handle temp;
73 acpi_status status;
74 unsigned long sta;
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
77 status = acpi_get_handle(handle, "_STA", &temp);
78 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -040079 return 1; /* _STA not found, assmue device present */
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
81 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
82 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -040083 return 0; /* Firmware error */
Linus Torvalds1da177e2005-04-16 15:20:36 -070084
Patrick Mocheld550d982006-06-27 00:41:40 -040085 return ((sta & ACPI_STA_PRESENT) == ACPI_STA_PRESENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -070086}
87
88/*******************************************************************/
Len Brown4be44fc2005-08-05 00:44:28 -040089static int acpi_container_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -070090{
91 struct acpi_container *container;
92
Linus Torvalds1da177e2005-04-16 15:20:36 -070093
94 if (!device) {
Len Brown64684632006-06-26 23:41:38 -040095 printk(KERN_ERR PREFIX "device is NULL\n");
Patrick Mocheld550d982006-06-27 00:41:40 -040096 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 }
98
99 container = kmalloc(sizeof(struct acpi_container), GFP_KERNEL);
Len Brown4be44fc2005-08-05 00:44:28 -0400100 if (!container)
Patrick Mocheld550d982006-06-27 00:41:40 -0400101 return -ENOMEM;
Len Brown4be44fc2005-08-05 00:44:28 -0400102
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 memset(container, 0, sizeof(struct acpi_container));
104 container->handle = device->handle;
105 strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
106 strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
107 acpi_driver_data(device) = container;
108
Len Brown4be44fc2005-08-05 00:44:28 -0400109 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",
110 acpi_device_name(device), acpi_device_bid(device)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111
Patrick Mocheld550d982006-06-27 00:41:40 -0400112 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113}
114
Len Brown4be44fc2005-08-05 00:44:28 -0400115static int acpi_container_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116{
Len Brown4be44fc2005-08-05 00:44:28 -0400117 acpi_status status = AE_OK;
118 struct acpi_container *pc = NULL;
Jesper Juhl6044ec82005-11-07 01:01:32 -0800119
Len Brown4be44fc2005-08-05 00:44:28 -0400120 pc = (struct acpi_container *)acpi_driver_data(device);
Jesper Juhl6044ec82005-11-07 01:01:32 -0800121 kfree(pc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 return status;
123}
124
Len Brown4be44fc2005-08-05 00:44:28 -0400125static int container_device_add(struct acpi_device **device, acpi_handle handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126{
127 acpi_handle phandle;
128 struct acpi_device *pdev;
129 int result;
130
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131
132 if (acpi_get_parent(handle, &phandle)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400133 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 }
135
136 if (acpi_bus_get_device(phandle, &pdev)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400137 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 }
139
140 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400141 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 }
143
Rajesh Shah3fb02732005-04-28 00:25:52 -0700144 result = acpi_bus_start(*device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145
Patrick Mocheld550d982006-06-27 00:41:40 -0400146 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147}
148
Len Brown4be44fc2005-08-05 00:44:28 -0400149static void container_notify_cb(acpi_handle handle, u32 type, void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150{
Len Brown4be44fc2005-08-05 00:44:28 -0400151 struct acpi_device *device = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 int result;
153 int present;
154 acpi_status status;
155
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156
157 present = is_device_present(handle);
Len Brown4be44fc2005-08-05 00:44:28 -0400158
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 switch (type) {
160 case ACPI_NOTIFY_BUS_CHECK:
161 /* Fall through */
162 case ACPI_NOTIFY_DEVICE_CHECK:
163 printk("Container driver received %s event\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400164 (type == ACPI_NOTIFY_BUS_CHECK) ?
165 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 status = acpi_bus_get_device(handle, &device);
167 if (present) {
168 if (ACPI_FAILURE(status) || !device) {
169 result = container_device_add(&device, handle);
170 if (!result)
Kay Sievers312c0042005-11-16 09:00:00 +0100171 kobject_uevent(&device->kobj,
172 KOBJ_ONLINE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 else
174 printk("Failed to add container\n");
175 }
176 } else {
177 if (ACPI_SUCCESS(status)) {
178 /* device exist and this is a remove request */
Kay Sievers312c0042005-11-16 09:00:00 +0100179 kobject_uevent(&device->kobj, KOBJ_OFFLINE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 }
181 }
182 break;
183 case ACPI_NOTIFY_EJECT_REQUEST:
184 if (!acpi_bus_get_device(handle, &device) && device) {
Kay Sievers312c0042005-11-16 09:00:00 +0100185 kobject_uevent(&device->kobj, KOBJ_OFFLINE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 }
187 break;
188 default:
189 break;
190 }
Patrick Mocheld550d982006-06-27 00:41:40 -0400191 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192}
193
194static acpi_status
195container_walk_namespace_cb(acpi_handle handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400196 u32 lvl, void *context, void **rv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197{
Len Brown4be44fc2005-08-05 00:44:28 -0400198 char *hid = NULL;
199 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
200 struct acpi_device_info *info;
201 acpi_status status;
202 int *action = context;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204
205 status = acpi_get_object_info(handle, &buffer);
206 if (ACPI_FAILURE(status) || !buffer.pointer) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400207 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 }
209
210 info = buffer.pointer;
211 if (info->valid & ACPI_VALID_HID)
212 hid = info->hardware_id.value;
213
214 if (hid == NULL) {
215 goto end;
216 }
217
218 if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") &&
Len Brown4be44fc2005-08-05 00:44:28 -0400219 strcmp(hid, "PNP0A06")) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 goto end;
221 }
222
Len Brown4be44fc2005-08-05 00:44:28 -0400223 switch (*action) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 case INSTALL_NOTIFY_HANDLER:
225 acpi_install_notify_handler(handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400226 ACPI_SYSTEM_NOTIFY,
227 container_notify_cb, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 break;
229 case UNINSTALL_NOTIFY_HANDLER:
230 acpi_remove_notify_handler(handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400231 ACPI_SYSTEM_NOTIFY,
232 container_notify_cb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 break;
234 default:
235 break;
236 }
237
Len Brown4be44fc2005-08-05 00:44:28 -0400238 end:
Len Brown02438d82006-06-30 03:19:10 -0400239 kfree(buffer.pointer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240
Patrick Mocheld550d982006-06-27 00:41:40 -0400241 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242}
243
Len Brown4be44fc2005-08-05 00:44:28 -0400244static int __init acpi_container_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245{
Len Brown4be44fc2005-08-05 00:44:28 -0400246 int result = 0;
247 int action = INSTALL_NOTIFY_HANDLER;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248
249 result = acpi_bus_register_driver(&acpi_container_driver);
250 if (result < 0) {
Len Brown4be44fc2005-08-05 00:44:28 -0400251 return (result);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 }
253
254 /* register notify handler to every container device */
255 acpi_walk_namespace(ACPI_TYPE_DEVICE,
Len Brown4be44fc2005-08-05 00:44:28 -0400256 ACPI_ROOT_OBJECT,
257 ACPI_UINT32_MAX,
258 container_walk_namespace_cb, &action, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259
Len Brown4be44fc2005-08-05 00:44:28 -0400260 return (0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261}
262
Len Brown4be44fc2005-08-05 00:44:28 -0400263static void __exit acpi_container_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264{
Len Brown4be44fc2005-08-05 00:44:28 -0400265 int action = UNINSTALL_NOTIFY_HANDLER;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267
268 acpi_walk_namespace(ACPI_TYPE_DEVICE,
Len Brown4be44fc2005-08-05 00:44:28 -0400269 ACPI_ROOT_OBJECT,
270 ACPI_UINT32_MAX,
271 container_walk_namespace_cb, &action, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272
273 acpi_bus_unregister_driver(&acpi_container_driver);
274
Patrick Mocheld550d982006-06-27 00:41:40 -0400275 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276}
277
278module_init(acpi_container_init);
279module_exit(acpi_container_exit);