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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>
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
Burman Yan36bcbec2006-12-19 12:56:11 -080099 container = kzalloc(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 container->handle = device->handle;
104 strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
105 strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
106 acpi_driver_data(device) = container;
107
Len Brown4be44fc2005-08-05 00:44:28 -0400108 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",
109 acpi_device_name(device), acpi_device_bid(device)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
Patrick Mocheld550d982006-06-27 00:41:40 -0400111 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112}
113
Len Brown4be44fc2005-08-05 00:44:28 -0400114static int acpi_container_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115{
Len Brown4be44fc2005-08-05 00:44:28 -0400116 acpi_status status = AE_OK;
117 struct acpi_container *pc = NULL;
Jesper Juhl6044ec82005-11-07 01:01:32 -0800118
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200119 pc = acpi_driver_data(device);
Jesper Juhl6044ec82005-11-07 01:01:32 -0800120 kfree(pc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 return status;
122}
123
Len Brown4be44fc2005-08-05 00:44:28 -0400124static int container_device_add(struct acpi_device **device, acpi_handle handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125{
126 acpi_handle phandle;
127 struct acpi_device *pdev;
128 int result;
129
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
131 if (acpi_get_parent(handle, &phandle)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400132 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 }
134
135 if (acpi_bus_get_device(phandle, &pdev)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400136 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 }
138
139 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400140 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 }
142
Rajesh Shah3fb02732005-04-28 00:25:52 -0700143 result = acpi_bus_start(*device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144
Patrick Mocheld550d982006-06-27 00:41:40 -0400145 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146}
147
Len Brown4be44fc2005-08-05 00:44:28 -0400148static void container_notify_cb(acpi_handle handle, u32 type, void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149{
Len Brown4be44fc2005-08-05 00:44:28 -0400150 struct acpi_device *device = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 int result;
152 int present;
153 acpi_status status;
154
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
156 present = is_device_present(handle);
Len Brown4be44fc2005-08-05 00:44:28 -0400157
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 switch (type) {
159 case ACPI_NOTIFY_BUS_CHECK:
160 /* Fall through */
161 case ACPI_NOTIFY_DEVICE_CHECK:
162 printk("Container driver received %s event\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400163 (type == ACPI_NOTIFY_BUS_CHECK) ?
164 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 status = acpi_bus_get_device(handle, &device);
166 if (present) {
167 if (ACPI_FAILURE(status) || !device) {
168 result = container_device_add(&device, handle);
169 if (!result)
Kay Sievers312c0042005-11-16 09:00:00 +0100170 kobject_uevent(&device->kobj,
171 KOBJ_ONLINE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 else
173 printk("Failed to add container\n");
174 }
175 } else {
176 if (ACPI_SUCCESS(status)) {
177 /* device exist and this is a remove request */
Kay Sievers312c0042005-11-16 09:00:00 +0100178 kobject_uevent(&device->kobj, KOBJ_OFFLINE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 }
180 }
181 break;
182 case ACPI_NOTIFY_EJECT_REQUEST:
183 if (!acpi_bus_get_device(handle, &device) && device) {
Kay Sievers312c0042005-11-16 09:00:00 +0100184 kobject_uevent(&device->kobj, KOBJ_OFFLINE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 }
186 break;
187 default:
188 break;
189 }
Patrick Mocheld550d982006-06-27 00:41:40 -0400190 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191}
192
193static acpi_status
194container_walk_namespace_cb(acpi_handle handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400195 u32 lvl, void *context, void **rv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196{
Len Brown4be44fc2005-08-05 00:44:28 -0400197 char *hid = NULL;
198 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
199 struct acpi_device_info *info;
200 acpi_status status;
201 int *action = context;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203
204 status = acpi_get_object_info(handle, &buffer);
205 if (ACPI_FAILURE(status) || !buffer.pointer) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400206 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 }
208
209 info = buffer.pointer;
210 if (info->valid & ACPI_VALID_HID)
211 hid = info->hardware_id.value;
212
213 if (hid == NULL) {
214 goto end;
215 }
216
217 if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") &&
Len Brown4be44fc2005-08-05 00:44:28 -0400218 strcmp(hid, "PNP0A06")) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 goto end;
220 }
221
Len Brown4be44fc2005-08-05 00:44:28 -0400222 switch (*action) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 case INSTALL_NOTIFY_HANDLER:
224 acpi_install_notify_handler(handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400225 ACPI_SYSTEM_NOTIFY,
226 container_notify_cb, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 break;
228 case UNINSTALL_NOTIFY_HANDLER:
229 acpi_remove_notify_handler(handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400230 ACPI_SYSTEM_NOTIFY,
231 container_notify_cb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 break;
233 default:
234 break;
235 }
236
Len Brown4be44fc2005-08-05 00:44:28 -0400237 end:
Len Brown02438d82006-06-30 03:19:10 -0400238 kfree(buffer.pointer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239
Patrick Mocheld550d982006-06-27 00:41:40 -0400240 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241}
242
Len Brown4be44fc2005-08-05 00:44:28 -0400243static int __init acpi_container_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244{
Len Brown4be44fc2005-08-05 00:44:28 -0400245 int result = 0;
246 int action = INSTALL_NOTIFY_HANDLER;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247
248 result = acpi_bus_register_driver(&acpi_container_driver);
249 if (result < 0) {
Len Brown4be44fc2005-08-05 00:44:28 -0400250 return (result);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 }
252
253 /* register notify handler to every container device */
254 acpi_walk_namespace(ACPI_TYPE_DEVICE,
Len Brown4be44fc2005-08-05 00:44:28 -0400255 ACPI_ROOT_OBJECT,
256 ACPI_UINT32_MAX,
257 container_walk_namespace_cb, &action, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258
Len Brown4be44fc2005-08-05 00:44:28 -0400259 return (0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260}
261
Len Brown4be44fc2005-08-05 00:44:28 -0400262static void __exit acpi_container_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263{
Len Brown4be44fc2005-08-05 00:44:28 -0400264 int action = UNINSTALL_NOTIFY_HANDLER;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266
267 acpi_walk_namespace(ACPI_TYPE_DEVICE,
Len Brown4be44fc2005-08-05 00:44:28 -0400268 ACPI_ROOT_OBJECT,
269 ACPI_UINT32_MAX,
270 container_walk_namespace_cb, &action, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
272 acpi_bus_unregister_driver(&acpi_container_driver);
273
Patrick Mocheld550d982006-06-27 00:41:40 -0400274 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275}
276
277module_init(acpi_container_init);
278module_exit(acpi_container_exit);