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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
76 ACPI_FUNCTION_TRACE("is_device_present");
77
78 status = acpi_get_handle(handle, "_STA", &temp);
79 if (ACPI_FAILURE(status))
Len Brown4be44fc2005-08-05 00:44:28 -040080 return_VALUE(1); /* _STA not found, assmue device present */
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
82 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
83 if (ACPI_FAILURE(status))
Len Brown4be44fc2005-08-05 00:44:28 -040084 return_VALUE(0); /* Firmware error */
Linus Torvalds1da177e2005-04-16 15:20:36 -070085
86 return_VALUE((sta & ACPI_STA_PRESENT) == ACPI_STA_PRESENT);
87}
88
89/*******************************************************************/
Len Brown4be44fc2005-08-05 00:44:28 -040090static int acpi_container_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -070091{
92 struct acpi_container *container;
93
94 ACPI_FUNCTION_TRACE("acpi_container_add");
95
96 if (!device) {
97 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "device is NULL\n"));
98 return_VALUE(-EINVAL);
99 }
100
101 container = kmalloc(sizeof(struct acpi_container), GFP_KERNEL);
Len Brown4be44fc2005-08-05 00:44:28 -0400102 if (!container)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 return_VALUE(-ENOMEM);
Len Brown4be44fc2005-08-05 00:44:28 -0400104
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 memset(container, 0, sizeof(struct acpi_container));
106 container->handle = device->handle;
107 strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
108 strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
109 acpi_driver_data(device) = container;
110
Len Brown4be44fc2005-08-05 00:44:28 -0400111 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",
112 acpi_device_name(device), acpi_device_bid(device)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
114 return_VALUE(0);
115}
116
Len Brown4be44fc2005-08-05 00:44:28 -0400117static int acpi_container_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118{
Len Brown4be44fc2005-08-05 00:44:28 -0400119 acpi_status status = AE_OK;
120 struct acpi_container *pc = NULL;
Jesper Juhl6044ec82005-11-07 01:01:32 -0800121
Len Brown4be44fc2005-08-05 00:44:28 -0400122 pc = (struct acpi_container *)acpi_driver_data(device);
Jesper Juhl6044ec82005-11-07 01:01:32 -0800123 kfree(pc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 return status;
125}
126
Len Brown4be44fc2005-08-05 00:44:28 -0400127static int container_device_add(struct acpi_device **device, acpi_handle handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128{
129 acpi_handle phandle;
130 struct acpi_device *pdev;
131 int result;
132
133 ACPI_FUNCTION_TRACE("container_device_add");
134
135 if (acpi_get_parent(handle, &phandle)) {
136 return_VALUE(-ENODEV);
137 }
138
139 if (acpi_bus_get_device(phandle, &pdev)) {
140 return_VALUE(-ENODEV);
141 }
142
143 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
144 return_VALUE(-ENODEV);
145 }
146
Rajesh Shah3fb02732005-04-28 00:25:52 -0700147 result = acpi_bus_start(*device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
149 return_VALUE(result);
150}
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
159 ACPI_FUNCTION_TRACE("container_notify_cb");
160
161 present = is_device_present(handle);
Len Brown4be44fc2005-08-05 00:44:28 -0400162
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 switch (type) {
164 case ACPI_NOTIFY_BUS_CHECK:
165 /* Fall through */
166 case ACPI_NOTIFY_DEVICE_CHECK:
167 printk("Container driver received %s event\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400168 (type == ACPI_NOTIFY_BUS_CHECK) ?
169 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 status = acpi_bus_get_device(handle, &device);
171 if (present) {
172 if (ACPI_FAILURE(status) || !device) {
173 result = container_device_add(&device, handle);
174 if (!result)
Kay Sievers312c0042005-11-16 09:00:00 +0100175 kobject_uevent(&device->kobj,
176 KOBJ_ONLINE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 else
178 printk("Failed to add container\n");
179 }
180 } else {
181 if (ACPI_SUCCESS(status)) {
182 /* device exist and this is a remove request */
Kay Sievers312c0042005-11-16 09:00:00 +0100183 kobject_uevent(&device->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) {
Kay Sievers312c0042005-11-16 09:00:00 +0100189 kobject_uevent(&device->kobj, KOBJ_OFFLINE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 }
191 break;
192 default:
193 break;
194 }
195 return_VOID;
196}
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
208 ACPI_FUNCTION_TRACE("container_walk_namespace_cb");
209
210 status = acpi_get_object_info(handle, &buffer);
211 if (ACPI_FAILURE(status) || !buffer.pointer) {
212 return_ACPI_STATUS(AE_OK);
213 }
214
215 info = buffer.pointer;
216 if (info->valid & ACPI_VALID_HID)
217 hid = info->hardware_id.value;
218
219 if (hid == NULL) {
220 goto end;
221 }
222
223 if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") &&
Len Brown4be44fc2005-08-05 00:44:28 -0400224 strcmp(hid, "PNP0A06")) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 goto end;
226 }
227
Len Brown4be44fc2005-08-05 00:44:28 -0400228 switch (*action) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 case INSTALL_NOTIFY_HANDLER:
230 acpi_install_notify_handler(handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400231 ACPI_SYSTEM_NOTIFY,
232 container_notify_cb, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 break;
234 case UNINSTALL_NOTIFY_HANDLER:
235 acpi_remove_notify_handler(handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400236 ACPI_SYSTEM_NOTIFY,
237 container_notify_cb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 break;
239 default:
240 break;
241 }
242
Len Brown4be44fc2005-08-05 00:44:28 -0400243 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 acpi_os_free(buffer.pointer);
245
246 return_ACPI_STATUS(AE_OK);
247}
248
Len Brown4be44fc2005-08-05 00:44:28 -0400249static int __init acpi_container_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250{
Len Brown4be44fc2005-08-05 00:44:28 -0400251 int result = 0;
252 int action = INSTALL_NOTIFY_HANDLER;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253
254 result = acpi_bus_register_driver(&acpi_container_driver);
255 if (result < 0) {
Len Brown4be44fc2005-08-05 00:44:28 -0400256 return (result);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 }
258
259 /* register notify handler to every container device */
260 acpi_walk_namespace(ACPI_TYPE_DEVICE,
Len Brown4be44fc2005-08-05 00:44:28 -0400261 ACPI_ROOT_OBJECT,
262 ACPI_UINT32_MAX,
263 container_walk_namespace_cb, &action, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264
Len Brown4be44fc2005-08-05 00:44:28 -0400265 return (0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266}
267
Len Brown4be44fc2005-08-05 00:44:28 -0400268static void __exit acpi_container_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269{
Len Brown4be44fc2005-08-05 00:44:28 -0400270 int action = UNINSTALL_NOTIFY_HANDLER;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
272 ACPI_FUNCTION_TRACE("acpi_container_exit");
273
274 acpi_walk_namespace(ACPI_TYPE_DEVICE,
Len Brown4be44fc2005-08-05 00:44:28 -0400275 ACPI_ROOT_OBJECT,
276 ACPI_UINT32_MAX,
277 container_walk_namespace_cb, &action, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278
279 acpi_bus_unregister_driver(&acpi_container_driver);
280
281 return_VOID;
282}
283
284module_init(acpi_container_init);
285module_exit(acpi_container_exit);