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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
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#define _COMPONENT ACPI_CONTAINER_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050045ACPI_MODULE_NAME("container");
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
Len Brownf52fd662007-02-12 22:42:12 -050047MODULE_AUTHOR("Anil S Keshavamurthy");
Len Brown7cda93e2007-02-12 23:50:02 -050048MODULE_DESCRIPTION("ACPI container driver");
Linus Torvalds1da177e2005-04-16 15:20:36 -070049MODULE_LICENSE("GPL");
50
Linus Torvalds1da177e2005-04-16 15:20:36 -070051static int acpi_container_add(struct acpi_device *device);
52static int acpi_container_remove(struct acpi_device *device, int type);
53
Thomas Renninger1ba90e32007-07-23 14:44:41 +020054static const struct acpi_device_id container_device_ids[] = {
55 {"ACPI0004", 0},
56 {"PNP0A05", 0},
57 {"PNP0A06", 0},
58 {"", 0},
59};
60MODULE_DEVICE_TABLE(acpi, container_device_ids);
61
Linus Torvalds1da177e2005-04-16 15:20:36 -070062static struct acpi_driver acpi_container_driver = {
Len Brownc2b67052007-02-12 23:33:40 -050063 .name = "container",
Len Brown4be44fc2005-08-05 00:44:28 -040064 .class = ACPI_CONTAINER_CLASS,
Thomas Renninger1ba90e32007-07-23 14:44:41 +020065 .ids = container_device_ids,
Len Brown4be44fc2005-08-05 00:44:28 -040066 .ops = {
67 .add = acpi_container_add,
68 .remove = acpi_container_remove,
69 },
Linus Torvalds1da177e2005-04-16 15:20:36 -070070};
71
Linus Torvalds1da177e2005-04-16 15:20:36 -070072/*******************************************************************/
73
Len Brown4be44fc2005-08-05 00:44:28 -040074static int is_device_present(acpi_handle handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -070075{
Len Brown4be44fc2005-08-05 00:44:28 -040076 acpi_handle temp;
77 acpi_status status;
Matthew Wilcox27663c52008-10-10 02:22:59 -040078 unsigned long long sta;
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
81 status = acpi_get_handle(handle, "_STA", &temp);
82 if (ACPI_FAILURE(status))
Bjorn Helgaasa0bd4ac2007-04-25 14:17:39 -040083 return 1; /* _STA not found, assume device present */
Linus Torvalds1da177e2005-04-16 15:20:36 -070084
85 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
86 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -040087 return 0; /* Firmware error */
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
Bjorn Helgaasa0bd4ac2007-04-25 14:17:39 -040089 return ((sta & ACPI_STA_DEVICE_PRESENT) == ACPI_STA_DEVICE_PRESENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -070090}
91
92/*******************************************************************/
Len Brown4be44fc2005-08-05 00:44:28 -040093static int acpi_container_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -070094{
95 struct acpi_container *container;
96
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
98 if (!device) {
Len Brown64684632006-06-26 23:41:38 -040099 printk(KERN_ERR PREFIX "device is NULL\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400100 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 }
102
Burman Yan36bcbec2006-12-19 12:56:11 -0800103 container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL);
Len Brown4be44fc2005-08-05 00:44:28 -0400104 if (!container)
Patrick Mocheld550d982006-06-27 00:41:40 -0400105 return -ENOMEM;
Len Brown4be44fc2005-08-05 00:44:28 -0400106
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 container->handle = device->handle;
108 strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
109 strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700110 device->driver_data = container;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111
Len Brown4be44fc2005-08-05 00:44:28 -0400112 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",
113 acpi_device_name(device), acpi_device_bid(device)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
Patrick Mocheld550d982006-06-27 00:41:40 -0400115 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116}
117
Len Brown4be44fc2005-08-05 00:44:28 -0400118static int acpi_container_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119{
Len Brown4be44fc2005-08-05 00:44:28 -0400120 acpi_status status = AE_OK;
121 struct acpi_container *pc = NULL;
Jesper Juhl6044ec82005-11-07 01:01:32 -0800122
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200123 pc = acpi_driver_data(device);
Jesper Juhl6044ec82005-11-07 01:01:32 -0800124 kfree(pc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 return status;
126}
127
Len Brown4be44fc2005-08-05 00:44:28 -0400128static int container_device_add(struct acpi_device **device, acpi_handle handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129{
130 acpi_handle phandle;
131 struct acpi_device *pdev;
132 int result;
133
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134
135 if (acpi_get_parent(handle, &phandle)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400136 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 }
138
139 if (acpi_bus_get_device(phandle, &pdev)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400140 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 }
142
143 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400144 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 }
146
Rajesh Shah3fb02732005-04-28 00:25:52 -0700147 result = acpi_bus_start(*device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
Patrick Mocheld550d982006-06-27 00:41:40 -0400149 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150}
151
Len Brown4be44fc2005-08-05 00:44:28 -0400152static void container_notify_cb(acpi_handle handle, u32 type, void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153{
Len Brown4be44fc2005-08-05 00:44:28 -0400154 struct acpi_device *device = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 int result;
156 int present;
157 acpi_status status;
158
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
160 present = is_device_present(handle);
Len Brown4be44fc2005-08-05 00:44:28 -0400161
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 switch (type) {
163 case ACPI_NOTIFY_BUS_CHECK:
164 /* Fall through */
165 case ACPI_NOTIFY_DEVICE_CHECK:
Frank Seidel4d939152009-02-04 17:03:07 +0100166 printk(KERN_WARNING "Container driver received %s event\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400167 (type == ACPI_NOTIFY_BUS_CHECK) ?
168 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 status = acpi_bus_get_device(handle, &device);
170 if (present) {
171 if (ACPI_FAILURE(status) || !device) {
172 result = container_device_add(&device, handle);
173 if (!result)
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800174 kobject_uevent(&device->dev.kobj,
Kay Sievers312c0042005-11-16 09:00:00 +0100175 KOBJ_ONLINE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 else
Frank Seidel4d939152009-02-04 17:03:07 +0100177 printk(KERN_WARNING
178 "Failed to add container\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 }
180 } else {
181 if (ACPI_SUCCESS(status)) {
182 /* device exist and this is a remove request */
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800183 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 }
185 }
186 break;
187 case ACPI_NOTIFY_EJECT_REQUEST:
188 if (!acpi_bus_get_device(handle, &device) && device) {
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800189 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 }
191 break;
192 default:
193 break;
194 }
Patrick Mocheld550d982006-06-27 00:41:40 -0400195 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196}
197
198static acpi_status
199container_walk_namespace_cb(acpi_handle handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400200 u32 lvl, void *context, void **rv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201{
Len Brown4be44fc2005-08-05 00:44:28 -0400202 char *hid = NULL;
203 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
204 struct acpi_device_info *info;
205 acpi_status status;
206 int *action = context;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208
209 status = acpi_get_object_info(handle, &buffer);
210 if (ACPI_FAILURE(status) || !buffer.pointer) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400211 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 }
213
214 info = buffer.pointer;
215 if (info->valid & ACPI_VALID_HID)
216 hid = info->hardware_id.value;
217
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:
Len Brown02438d82006-06-30 03:19:10 -0400243 kfree(buffer.pointer);
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,
262 container_walk_namespace_cb, &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,
275 container_walk_namespace_cb, &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);