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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
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#define ACPI_CONTAINER_DEVICE_NAME "ACPI container device"
39#define ACPI_CONTAINER_CLASS "container"
40
41#define INSTALL_NOTIFY_HANDLER 1
42#define UNINSTALL_NOTIFY_HANDLER 2
43
44#define ACPI_CONTAINER_COMPONENT 0x01000000
45#define _COMPONENT ACPI_CONTAINER_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050046ACPI_MODULE_NAME("container");
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
Len Brownf52fd662007-02-12 22:42:12 -050048MODULE_AUTHOR("Anil S Keshavamurthy");
Len Brown7cda93e2007-02-12 23:50:02 -050049MODULE_DESCRIPTION("ACPI container driver");
Linus Torvalds1da177e2005-04-16 15:20:36 -070050MODULE_LICENSE("GPL");
51
52#define ACPI_STA_PRESENT (0x00000001)
53
54static int acpi_container_add(struct acpi_device *device);
55static int acpi_container_remove(struct acpi_device *device, int type);
56
57static struct acpi_driver acpi_container_driver = {
Len Brownc2b67052007-02-12 23:33:40 -050058 .name = "container",
Len Brown4be44fc2005-08-05 00:44:28 -040059 .class = ACPI_CONTAINER_CLASS,
60 .ids = "ACPI0004,PNP0A05,PNP0A06",
61 .ops = {
62 .add = acpi_container_add,
63 .remove = acpi_container_remove,
64 },
Linus Torvalds1da177e2005-04-16 15:20:36 -070065};
66
Linus Torvalds1da177e2005-04-16 15:20:36 -070067/*******************************************************************/
68
Len Brown4be44fc2005-08-05 00:44:28 -040069static int is_device_present(acpi_handle handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -070070{
Len Brown4be44fc2005-08-05 00:44:28 -040071 acpi_handle temp;
72 acpi_status status;
73 unsigned long sta;
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
76 status = acpi_get_handle(handle, "_STA", &temp);
77 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -040078 return 1; /* _STA not found, assmue device present */
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
80 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
81 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -040082 return 0; /* Firmware error */
Linus Torvalds1da177e2005-04-16 15:20:36 -070083
Patrick Mocheld550d982006-06-27 00:41:40 -040084 return ((sta & ACPI_STA_PRESENT) == ACPI_STA_PRESENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -070085}
86
87/*******************************************************************/
Len Brown4be44fc2005-08-05 00:44:28 -040088static int acpi_container_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -070089{
90 struct acpi_container *container;
91
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
93 if (!device) {
Len Brown64684632006-06-26 23:41:38 -040094 printk(KERN_ERR PREFIX "device is NULL\n");
Patrick Mocheld550d982006-06-27 00:41:40 -040095 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 }
97
Burman Yan36bcbec2006-12-19 12:56:11 -080098 container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL);
Len Brown4be44fc2005-08-05 00:44:28 -040099 if (!container)
Patrick Mocheld550d982006-06-27 00:41:40 -0400100 return -ENOMEM;
Len Brown4be44fc2005-08-05 00:44:28 -0400101
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 container->handle = device->handle;
103 strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
104 strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
105 acpi_driver_data(device) = container;
106
Len Brown4be44fc2005-08-05 00:44:28 -0400107 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",
108 acpi_device_name(device), acpi_device_bid(device)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109
Patrick Mocheld550d982006-06-27 00:41:40 -0400110 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111}
112
Len Brown4be44fc2005-08-05 00:44:28 -0400113static int acpi_container_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114{
Len Brown4be44fc2005-08-05 00:44:28 -0400115 acpi_status status = AE_OK;
116 struct acpi_container *pc = NULL;
Jesper Juhl6044ec82005-11-07 01:01:32 -0800117
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200118 pc = acpi_driver_data(device);
Jesper Juhl6044ec82005-11-07 01:01:32 -0800119 kfree(pc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 return status;
121}
122
Len Brown4be44fc2005-08-05 00:44:28 -0400123static int container_device_add(struct acpi_device **device, acpi_handle handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124{
125 acpi_handle phandle;
126 struct acpi_device *pdev;
127 int result;
128
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
130 if (acpi_get_parent(handle, &phandle)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400131 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 }
133
134 if (acpi_bus_get_device(phandle, &pdev)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400135 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 }
137
138 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400139 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 }
141
Rajesh Shah3fb02732005-04-28 00:25:52 -0700142 result = acpi_bus_start(*device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
Patrick Mocheld550d982006-06-27 00:41:40 -0400144 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145}
146
Len Brown4be44fc2005-08-05 00:44:28 -0400147static void container_notify_cb(acpi_handle handle, u32 type, void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148{
Len Brown4be44fc2005-08-05 00:44:28 -0400149 struct acpi_device *device = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 int result;
151 int present;
152 acpi_status status;
153
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154
155 present = is_device_present(handle);
Len Brown4be44fc2005-08-05 00:44:28 -0400156
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 switch (type) {
158 case ACPI_NOTIFY_BUS_CHECK:
159 /* Fall through */
160 case ACPI_NOTIFY_DEVICE_CHECK:
161 printk("Container driver received %s event\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400162 (type == ACPI_NOTIFY_BUS_CHECK) ?
163 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 status = acpi_bus_get_device(handle, &device);
165 if (present) {
166 if (ACPI_FAILURE(status) || !device) {
167 result = container_device_add(&device, handle);
168 if (!result)
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800169 kobject_uevent(&device->dev.kobj,
Kay Sievers312c0042005-11-16 09:00:00 +0100170 KOBJ_ONLINE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 else
172 printk("Failed to add container\n");
173 }
174 } else {
175 if (ACPI_SUCCESS(status)) {
176 /* device exist and this is a remove request */
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800177 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 }
179 }
180 break;
181 case ACPI_NOTIFY_EJECT_REQUEST:
182 if (!acpi_bus_get_device(handle, &device) && device) {
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800183 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 }
185 break;
186 default:
187 break;
188 }
Patrick Mocheld550d982006-06-27 00:41:40 -0400189 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190}
191
192static acpi_status
193container_walk_namespace_cb(acpi_handle handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400194 u32 lvl, void *context, void **rv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195{
Len Brown4be44fc2005-08-05 00:44:28 -0400196 char *hid = NULL;
197 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
198 struct acpi_device_info *info;
199 acpi_status status;
200 int *action = context;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202
203 status = acpi_get_object_info(handle, &buffer);
204 if (ACPI_FAILURE(status) || !buffer.pointer) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400205 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 }
207
208 info = buffer.pointer;
209 if (info->valid & ACPI_VALID_HID)
210 hid = info->hardware_id.value;
211
212 if (hid == NULL) {
213 goto end;
214 }
215
216 if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") &&
Len Brown4be44fc2005-08-05 00:44:28 -0400217 strcmp(hid, "PNP0A06")) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 goto end;
219 }
220
Len Brown4be44fc2005-08-05 00:44:28 -0400221 switch (*action) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 case INSTALL_NOTIFY_HANDLER:
223 acpi_install_notify_handler(handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400224 ACPI_SYSTEM_NOTIFY,
225 container_notify_cb, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 break;
227 case UNINSTALL_NOTIFY_HANDLER:
228 acpi_remove_notify_handler(handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400229 ACPI_SYSTEM_NOTIFY,
230 container_notify_cb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 break;
232 default:
233 break;
234 }
235
Len Brown4be44fc2005-08-05 00:44:28 -0400236 end:
Len Brown02438d82006-06-30 03:19:10 -0400237 kfree(buffer.pointer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238
Patrick Mocheld550d982006-06-27 00:41:40 -0400239 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240}
241
Len Brown4be44fc2005-08-05 00:44:28 -0400242static int __init acpi_container_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243{
Len Brown4be44fc2005-08-05 00:44:28 -0400244 int result = 0;
245 int action = INSTALL_NOTIFY_HANDLER;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246
247 result = acpi_bus_register_driver(&acpi_container_driver);
248 if (result < 0) {
Len Brown4be44fc2005-08-05 00:44:28 -0400249 return (result);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 }
251
252 /* register notify handler to every container device */
253 acpi_walk_namespace(ACPI_TYPE_DEVICE,
Len Brown4be44fc2005-08-05 00:44:28 -0400254 ACPI_ROOT_OBJECT,
255 ACPI_UINT32_MAX,
256 container_walk_namespace_cb, &action, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
Len Brown4be44fc2005-08-05 00:44:28 -0400258 return (0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259}
260
Len Brown4be44fc2005-08-05 00:44:28 -0400261static void __exit acpi_container_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262{
Len Brown4be44fc2005-08-05 00:44:28 -0400263 int action = UNINSTALL_NOTIFY_HANDLER;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265
266 acpi_walk_namespace(ACPI_TYPE_DEVICE,
Len Brown4be44fc2005-08-05 00:44:28 -0400267 ACPI_ROOT_OBJECT,
268 ACPI_UINT32_MAX,
269 container_walk_namespace_cb, &action, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270
271 acpi_bus_unregister_driver(&acpi_container_driver);
272
Patrick Mocheld550d982006-06-27 00:41:40 -0400273 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274}
275
276module_init(acpi_container_init);
277module_exit(acpi_container_exit);