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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/acpi/container.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/acpi/container.c')
-rw-r--r--drivers/acpi/container.c303
1 files changed, 303 insertions, 0 deletions
diff --git a/drivers/acpi/container.c b/drivers/acpi/container.c
new file mode 100644
index 000000000000..5a0adbf8bc04
--- /dev/null
+++ b/drivers/acpi/container.c
@@ -0,0 +1,303 @@
1/*
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
47ACPI_MODULE_NAME ("acpi_container")
48
49MODULE_AUTHOR("Anil S Keshavamurthy");
50MODULE_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 = {
59 .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 },
66};
67
68
69/*******************************************************************/
70
71static int
72is_device_present(acpi_handle handle)
73{
74 acpi_handle temp;
75 acpi_status status;
76 unsigned long sta;
77
78 ACPI_FUNCTION_TRACE("is_device_present");
79
80 status = acpi_get_handle(handle, "_STA", &temp);
81 if (ACPI_FAILURE(status))
82 return_VALUE(1); /* _STA not found, assmue device present */
83
84 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
85 if (ACPI_FAILURE(status))
86 return_VALUE(0); /* Firmware error */
87
88 return_VALUE((sta & ACPI_STA_PRESENT) == ACPI_STA_PRESENT);
89}
90
91/*******************************************************************/
92static int
93acpi_container_add(struct acpi_device *device)
94{
95 struct acpi_container *container;
96
97 ACPI_FUNCTION_TRACE("acpi_container_add");
98
99 if (!device) {
100 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "device is NULL\n"));
101 return_VALUE(-EINVAL);
102 }
103
104 container = kmalloc(sizeof(struct acpi_container), GFP_KERNEL);
105 if(!container)
106 return_VALUE(-ENOMEM);
107
108 memset(container, 0, sizeof(struct acpi_container));
109 container->handle = device->handle;
110 strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
111 strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
112 acpi_driver_data(device) = container;
113
114 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n", \
115 acpi_device_name(device), acpi_device_bid(device)));
116
117
118 return_VALUE(0);
119}
120
121static int
122acpi_container_remove(struct acpi_device *device, int type)
123{
124 acpi_status status = AE_OK;
125 struct acpi_container *pc = NULL;
126 pc = (struct acpi_container*) acpi_driver_data(device);
127
128 if (pc)
129 kfree(pc);
130
131 return status;
132}
133
134
135static int
136container_device_add(struct acpi_device **device, acpi_handle handle)
137{
138 acpi_handle phandle;
139 struct acpi_device *pdev;
140 int result;
141
142 ACPI_FUNCTION_TRACE("container_device_add");
143
144 if (acpi_get_parent(handle, &phandle)) {
145 return_VALUE(-ENODEV);
146 }
147
148 if (acpi_bus_get_device(phandle, &pdev)) {
149 return_VALUE(-ENODEV);
150 }
151
152 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
153 return_VALUE(-ENODEV);
154 }
155
156 result = acpi_bus_scan(*device);
157
158 return_VALUE(result);
159}
160
161static void
162container_notify_cb(acpi_handle handle, u32 type, void *context)
163{
164 struct acpi_device *device = NULL;
165 int result;
166 int present;
167 acpi_status status;
168
169 ACPI_FUNCTION_TRACE("container_notify_cb");
170
171 present = is_device_present(handle);
172
173 switch (type) {
174 case ACPI_NOTIFY_BUS_CHECK:
175 /* Fall through */
176 case ACPI_NOTIFY_DEVICE_CHECK:
177 printk("Container driver received %s event\n",
178 (type == ACPI_NOTIFY_BUS_CHECK)?
179 "ACPI_NOTIFY_BUS_CHECK":"ACPI_NOTIFY_DEVICE_CHECK");
180 status = acpi_bus_get_device(handle, &device);
181 if (present) {
182 if (ACPI_FAILURE(status) || !device) {
183 result = container_device_add(&device, handle);
184 if (!result)
185 kobject_hotplug(&device->kobj,
186 KOBJ_ONLINE);
187 else
188 printk("Failed to add container\n");
189 }
190 } else {
191 if (ACPI_SUCCESS(status)) {
192 /* device exist and this is a remove request */
193 kobject_hotplug(&device->kobj, KOBJ_OFFLINE);
194 }
195 }
196 break;
197 case ACPI_NOTIFY_EJECT_REQUEST:
198 if (!acpi_bus_get_device(handle, &device) && device) {
199 kobject_hotplug(&device->kobj, KOBJ_OFFLINE);
200 }
201 break;
202 default:
203 break;
204 }
205 return_VOID;
206}
207
208static acpi_status
209container_walk_namespace_cb(acpi_handle handle,
210 u32 lvl,
211 void *context,
212 void **rv)
213{
214 char *hid = NULL;
215 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
216 struct acpi_device_info *info;
217 acpi_status status;
218 int *action = context;
219
220 ACPI_FUNCTION_TRACE("container_walk_namespace_cb");
221
222 status = acpi_get_object_info(handle, &buffer);
223 if (ACPI_FAILURE(status) || !buffer.pointer) {
224 return_ACPI_STATUS(AE_OK);
225 }
226
227 info = buffer.pointer;
228 if (info->valid & ACPI_VALID_HID)
229 hid = info->hardware_id.value;
230
231 if (hid == NULL) {
232 goto end;
233 }
234
235 if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") &&
236 strcmp(hid, "PNP0A06")) {
237 goto end;
238 }
239
240 switch(*action) {
241 case INSTALL_NOTIFY_HANDLER:
242 acpi_install_notify_handler(handle,
243 ACPI_SYSTEM_NOTIFY,
244 container_notify_cb,
245 NULL);
246 break;
247 case UNINSTALL_NOTIFY_HANDLER:
248 acpi_remove_notify_handler(handle,
249 ACPI_SYSTEM_NOTIFY,
250 container_notify_cb);
251 break;
252 default:
253 break;
254 }
255
256end:
257 acpi_os_free(buffer.pointer);
258
259 return_ACPI_STATUS(AE_OK);
260}
261
262
263static int __init
264acpi_container_init(void)
265{
266 int result = 0;
267 int action = INSTALL_NOTIFY_HANDLER;
268
269 result = acpi_bus_register_driver(&acpi_container_driver);
270 if (result < 0) {
271 return(result);
272 }
273
274 /* register notify handler to every container device */
275 acpi_walk_namespace(ACPI_TYPE_DEVICE,
276 ACPI_ROOT_OBJECT,
277 ACPI_UINT32_MAX,
278 container_walk_namespace_cb,
279 &action, NULL);
280
281 return(0);
282}
283
284static void __exit
285acpi_container_exit(void)
286{
287 int action = UNINSTALL_NOTIFY_HANDLER;
288
289 ACPI_FUNCTION_TRACE("acpi_container_exit");
290
291 acpi_walk_namespace(ACPI_TYPE_DEVICE,
292 ACPI_ROOT_OBJECT,
293 ACPI_UINT32_MAX,
294 container_walk_namespace_cb,
295 &action, NULL);
296
297 acpi_bus_unregister_driver(&acpi_container_driver);
298
299 return_VOID;
300}
301
302module_init(acpi_container_init);
303module_exit(acpi_container_exit);