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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
Len Browna192a952009-07-28 16:45:54 -040038#define PREFIX "ACPI: "
39
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#define ACPI_CONTAINER_DEVICE_NAME "ACPI container device"
41#define ACPI_CONTAINER_CLASS "container"
42
43#define INSTALL_NOTIFY_HANDLER 1
44#define UNINSTALL_NOTIFY_HANDLER 2
45
Linus Torvalds1da177e2005-04-16 15:20:36 -070046#define _COMPONENT ACPI_CONTAINER_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050047ACPI_MODULE_NAME("container");
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
Len Brownf52fd662007-02-12 22:42:12 -050049MODULE_AUTHOR("Anil S Keshavamurthy");
Len Brown7cda93e2007-02-12 23:50:02 -050050MODULE_DESCRIPTION("ACPI container driver");
Linus Torvalds1da177e2005-04-16 15:20:36 -070051MODULE_LICENSE("GPL");
52
Linus Torvalds1da177e2005-04-16 15:20:36 -070053static int acpi_container_add(struct acpi_device *device);
54static int acpi_container_remove(struct acpi_device *device, int type);
55
Thomas Renninger1ba90e32007-07-23 14:44:41 +020056static const struct acpi_device_id container_device_ids[] = {
57 {"ACPI0004", 0},
58 {"PNP0A05", 0},
59 {"PNP0A06", 0},
60 {"", 0},
61};
62MODULE_DEVICE_TABLE(acpi, container_device_ids);
63
Linus Torvalds1da177e2005-04-16 15:20:36 -070064static struct acpi_driver acpi_container_driver = {
Len Brownc2b67052007-02-12 23:33:40 -050065 .name = "container",
Len Brown4be44fc2005-08-05 00:44:28 -040066 .class = ACPI_CONTAINER_CLASS,
Thomas Renninger1ba90e32007-07-23 14:44:41 +020067 .ids = container_device_ids,
Len Brown4be44fc2005-08-05 00:44:28 -040068 .ops = {
69 .add = acpi_container_add,
70 .remove = acpi_container_remove,
71 },
Linus Torvalds1da177e2005-04-16 15:20:36 -070072};
73
Linus Torvalds1da177e2005-04-16 15:20:36 -070074/*******************************************************************/
75
Len Brown4be44fc2005-08-05 00:44:28 -040076static int is_device_present(acpi_handle handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -070077{
Len Brown4be44fc2005-08-05 00:44:28 -040078 acpi_handle temp;
79 acpi_status status;
Matthew Wilcox27663c52008-10-10 02:22:59 -040080 unsigned long long sta;
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
Linus Torvalds1da177e2005-04-16 15:20:36 -070082
83 status = acpi_get_handle(handle, "_STA", &temp);
84 if (ACPI_FAILURE(status))
Bjorn Helgaasa0bd4ac2007-04-25 14:17:39 -040085 return 1; /* _STA not found, assume device present */
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
87 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
88 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -040089 return 0; /* Firmware error */
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
Bjorn Helgaasa0bd4ac2007-04-25 14:17:39 -040091 return ((sta & ACPI_STA_DEVICE_PRESENT) == ACPI_STA_DEVICE_PRESENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -070092}
93
94/*******************************************************************/
Len Brown4be44fc2005-08-05 00:44:28 -040095static int acpi_container_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -070096{
97 struct acpi_container *container;
98
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
100 if (!device) {
Len Brown64684632006-06-26 23:41:38 -0400101 printk(KERN_ERR PREFIX "device is NULL\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400102 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 }
104
Burman Yan36bcbec2006-12-19 12:56:11 -0800105 container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL);
Len Brown4be44fc2005-08-05 00:44:28 -0400106 if (!container)
Patrick Mocheld550d982006-06-27 00:41:40 -0400107 return -ENOMEM;
Len Brown4be44fc2005-08-05 00:44:28 -0400108
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 container->handle = device->handle;
110 strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
111 strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700112 device->driver_data = container;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
Len Brown4be44fc2005-08-05 00:44:28 -0400114 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",
115 acpi_device_name(device), acpi_device_bid(device)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
Patrick Mocheld550d982006-06-27 00:41:40 -0400117 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118}
119
Len Brown4be44fc2005-08-05 00:44:28 -0400120static int acpi_container_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121{
Len Brown4be44fc2005-08-05 00:44:28 -0400122 acpi_status status = AE_OK;
123 struct acpi_container *pc = NULL;
Jesper Juhl6044ec82005-11-07 01:01:32 -0800124
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200125 pc = acpi_driver_data(device);
Jesper Juhl6044ec82005-11-07 01:01:32 -0800126 kfree(pc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 return status;
128}
129
Len Brown4be44fc2005-08-05 00:44:28 -0400130static int container_device_add(struct acpi_device **device, acpi_handle handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131{
132 acpi_handle phandle;
133 struct acpi_device *pdev;
134 int result;
135
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
137 if (acpi_get_parent(handle, &phandle)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400138 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 }
140
141 if (acpi_bus_get_device(phandle, &pdev)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400142 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 }
144
145 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400146 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 }
148
Rajesh Shah3fb02732005-04-28 00:25:52 -0700149 result = acpi_bus_start(*device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
Patrick Mocheld550d982006-06-27 00:41:40 -0400151 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152}
153
Len Brown4be44fc2005-08-05 00:44:28 -0400154static void container_notify_cb(acpi_handle handle, u32 type, void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155{
Len Brown4be44fc2005-08-05 00:44:28 -0400156 struct acpi_device *device = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 int result;
158 int present;
159 acpi_status status;
160
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
162 present = is_device_present(handle);
Len Brown4be44fc2005-08-05 00:44:28 -0400163
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 switch (type) {
165 case ACPI_NOTIFY_BUS_CHECK:
166 /* Fall through */
167 case ACPI_NOTIFY_DEVICE_CHECK:
Frank Seidel4d939152009-02-04 17:03:07 +0100168 printk(KERN_WARNING "Container driver received %s event\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400169 (type == ACPI_NOTIFY_BUS_CHECK) ?
170 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 status = acpi_bus_get_device(handle, &device);
172 if (present) {
173 if (ACPI_FAILURE(status) || !device) {
174 result = container_device_add(&device, handle);
175 if (!result)
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800176 kobject_uevent(&device->dev.kobj,
Kay Sievers312c0042005-11-16 09:00:00 +0100177 KOBJ_ONLINE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 else
Frank Seidel4d939152009-02-04 17:03:07 +0100179 printk(KERN_WARNING
180 "Failed to add container\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 }
182 } else {
183 if (ACPI_SUCCESS(status)) {
184 /* device exist and this is a remove request */
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800185 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 }
187 }
188 break;
189 case ACPI_NOTIFY_EJECT_REQUEST:
190 if (!acpi_bus_get_device(handle, &device) && device) {
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800191 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 }
193 break;
194 default:
195 break;
196 }
Patrick Mocheld550d982006-06-27 00:41:40 -0400197 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198}
199
200static acpi_status
201container_walk_namespace_cb(acpi_handle handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400202 u32 lvl, void *context, void **rv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203{
Len Brown4be44fc2005-08-05 00:44:28 -0400204 char *hid = NULL;
Len Brown4be44fc2005-08-05 00:44:28 -0400205 struct acpi_device_info *info;
206 acpi_status status;
207 int *action = context;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208
Bob Moore15b8dd52009-06-29 13:39:29 +0800209 status = acpi_get_object_info(handle, &info);
210 if (ACPI_FAILURE(status)) {
Patrick Mocheld550d982006-06-27 00:41:40 -0400211 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 }
213
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 if (info->valid & ACPI_VALID_HID)
Bob Moore15b8dd52009-06-29 13:39:29 +0800215 hid = info->hardware_id.string;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216
217 if (hid == NULL) {
218 goto end;
219 }
220
221 if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") &&
Len Brown4be44fc2005-08-05 00:44:28 -0400222 strcmp(hid, "PNP0A06")) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 goto end;
224 }
225
Len Brown4be44fc2005-08-05 00:44:28 -0400226 switch (*action) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 case INSTALL_NOTIFY_HANDLER:
228 acpi_install_notify_handler(handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400229 ACPI_SYSTEM_NOTIFY,
230 container_notify_cb, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 break;
232 case UNINSTALL_NOTIFY_HANDLER:
233 acpi_remove_notify_handler(handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400234 ACPI_SYSTEM_NOTIFY,
235 container_notify_cb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 break;
237 default:
238 break;
239 }
240
Len Brown4be44fc2005-08-05 00:44:28 -0400241 end:
Bob Moore15b8dd52009-06-29 13:39:29 +0800242 kfree(info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243
Patrick Mocheld550d982006-06-27 00:41:40 -0400244 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245}
246
Len Brown4be44fc2005-08-05 00:44:28 -0400247static int __init acpi_container_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248{
Len Brown4be44fc2005-08-05 00:44:28 -0400249 int result = 0;
250 int action = INSTALL_NOTIFY_HANDLER;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
252 result = acpi_bus_register_driver(&acpi_container_driver);
253 if (result < 0) {
Len Brown4be44fc2005-08-05 00:44:28 -0400254 return (result);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 }
256
257 /* register notify handler to every container device */
258 acpi_walk_namespace(ACPI_TYPE_DEVICE,
Len Brown4be44fc2005-08-05 00:44:28 -0400259 ACPI_ROOT_OBJECT,
260 ACPI_UINT32_MAX,
261 container_walk_namespace_cb, &action, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
Len Brown4be44fc2005-08-05 00:44:28 -0400263 return (0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264}
265
Len Brown4be44fc2005-08-05 00:44:28 -0400266static void __exit acpi_container_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267{
Len Brown4be44fc2005-08-05 00:44:28 -0400268 int action = UNINSTALL_NOTIFY_HANDLER;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270
271 acpi_walk_namespace(ACPI_TYPE_DEVICE,
Len Brown4be44fc2005-08-05 00:44:28 -0400272 ACPI_ROOT_OBJECT,
273 ACPI_UINT32_MAX,
274 container_walk_namespace_cb, &action, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275
276 acpi_bus_unregister_driver(&acpi_container_driver);
277
Patrick Mocheld550d982006-06-27 00:41:40 -0400278 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279}
280
281module_init(acpi_container_init);
282module_exit(acpi_container_exit);