ia64/linux-2.6.18-xen.hg

view drivers/acpi/container.c @ 912:dd42cdb0ab89

[IA64] Build blktap2 driver by default in x86 builds.

add CONFIG_XEN_BLKDEV_TAP2=y to buildconfigs/linux-defconfig_xen_ia64.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
author Isaku Yamahata <yamahata@valinux.co.jp>
date Mon Jun 29 12:09:16 2009 +0900 (2009-06-29)
parents 831230e53067
children
line source
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>
38 #define ACPI_CONTAINER_DRIVER_NAME "ACPI container driver"
39 #define ACPI_CONTAINER_DEVICE_NAME "ACPI container device"
40 #define ACPI_CONTAINER_CLASS "container"
42 #define INSTALL_NOTIFY_HANDLER 1
43 #define UNINSTALL_NOTIFY_HANDLER 2
45 #define ACPI_CONTAINER_COMPONENT 0x01000000
46 #define _COMPONENT ACPI_CONTAINER_COMPONENT
47 ACPI_MODULE_NAME("acpi_container")
49 MODULE_AUTHOR("Anil S Keshavamurthy");
50 MODULE_DESCRIPTION(ACPI_CONTAINER_DRIVER_NAME);
51 MODULE_LICENSE("GPL");
53 #define ACPI_STA_PRESENT (0x00000001)
55 static int acpi_container_add(struct acpi_device *device);
56 static int acpi_container_remove(struct acpi_device *device, int type);
58 static 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 };
68 /*******************************************************************/
70 static int is_device_present(acpi_handle handle)
71 {
72 acpi_handle temp;
73 acpi_status status;
74 unsigned long sta;
77 status = acpi_get_handle(handle, "_STA", &temp);
78 if (ACPI_FAILURE(status))
79 return 1; /* _STA not found, assmue device present */
81 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
82 if (ACPI_FAILURE(status))
83 return 0; /* Firmware error */
85 return ((sta & ACPI_STA_PRESENT) == ACPI_STA_PRESENT);
86 }
88 /*******************************************************************/
89 static int acpi_container_add(struct acpi_device *device)
90 {
91 struct acpi_container *container;
94 if (!device) {
95 printk(KERN_ERR PREFIX "device is NULL\n");
96 return -EINVAL;
97 }
99 container = kmalloc(sizeof(struct acpi_container), GFP_KERNEL);
100 if (!container)
101 return -ENOMEM;
103 memset(container, 0, sizeof(struct acpi_container));
104 container->handle = device->handle;
105 strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
106 strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
107 acpi_driver_data(device) = container;
109 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",
110 acpi_device_name(device), acpi_device_bid(device)));
112 return 0;
113 }
115 static int acpi_container_remove(struct acpi_device *device, int type)
116 {
117 acpi_status status = AE_OK;
118 struct acpi_container *pc = NULL;
120 pc = (struct acpi_container *)acpi_driver_data(device);
121 kfree(pc);
122 return status;
123 }
125 static int container_device_add(struct acpi_device **device, acpi_handle handle)
126 {
127 acpi_handle phandle;
128 struct acpi_device *pdev;
129 int result;
132 if (acpi_get_parent(handle, &phandle)) {
133 return -ENODEV;
134 }
136 if (acpi_bus_get_device(phandle, &pdev)) {
137 return -ENODEV;
138 }
140 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
141 return -ENODEV;
142 }
144 result = acpi_bus_start(*device);
146 return result;
147 }
149 static void container_notify_cb(acpi_handle handle, u32 type, void *context)
150 {
151 struct acpi_device *device = NULL;
152 int result;
153 int present;
154 acpi_status status;
157 present = is_device_present(handle);
159 switch (type) {
160 case ACPI_NOTIFY_BUS_CHECK:
161 /* Fall through */
162 case ACPI_NOTIFY_DEVICE_CHECK:
163 printk("Container driver received %s event\n",
164 (type == ACPI_NOTIFY_BUS_CHECK) ?
165 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
166 status = acpi_bus_get_device(handle, &device);
167 if (present) {
168 if (ACPI_FAILURE(status) || !device) {
169 result = container_device_add(&device, handle);
170 if (!result)
171 kobject_uevent(&device->kobj,
172 KOBJ_ONLINE);
173 else
174 printk("Failed to add container\n");
175 }
176 } else {
177 if (ACPI_SUCCESS(status)) {
178 /* device exist and this is a remove request */
179 kobject_uevent(&device->kobj, KOBJ_OFFLINE);
180 }
181 }
182 break;
183 case ACPI_NOTIFY_EJECT_REQUEST:
184 if (!acpi_bus_get_device(handle, &device) && device) {
185 kobject_uevent(&device->kobj, KOBJ_OFFLINE);
186 }
187 break;
188 default:
189 break;
190 }
191 return;
192 }
194 static acpi_status
195 container_walk_namespace_cb(acpi_handle handle,
196 u32 lvl, void *context, void **rv)
197 {
198 char *hid = NULL;
199 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
200 struct acpi_device_info *info;
201 acpi_status status;
202 int *action = context;
205 status = acpi_get_object_info(handle, &buffer);
206 if (ACPI_FAILURE(status) || !buffer.pointer) {
207 return AE_OK;
208 }
210 info = buffer.pointer;
211 if (info->valid & ACPI_VALID_HID)
212 hid = info->hardware_id.value;
214 if (hid == NULL) {
215 goto end;
216 }
218 if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") &&
219 strcmp(hid, "PNP0A06")) {
220 goto end;
221 }
223 switch (*action) {
224 case INSTALL_NOTIFY_HANDLER:
225 acpi_install_notify_handler(handle,
226 ACPI_SYSTEM_NOTIFY,
227 container_notify_cb, NULL);
228 break;
229 case UNINSTALL_NOTIFY_HANDLER:
230 acpi_remove_notify_handler(handle,
231 ACPI_SYSTEM_NOTIFY,
232 container_notify_cb);
233 break;
234 default:
235 break;
236 }
238 end:
239 kfree(buffer.pointer);
241 return AE_OK;
242 }
244 static int __init acpi_container_init(void)
245 {
246 int result = 0;
247 int action = INSTALL_NOTIFY_HANDLER;
249 result = acpi_bus_register_driver(&acpi_container_driver);
250 if (result < 0) {
251 return (result);
252 }
254 /* register notify handler to every container device */
255 acpi_walk_namespace(ACPI_TYPE_DEVICE,
256 ACPI_ROOT_OBJECT,
257 ACPI_UINT32_MAX,
258 container_walk_namespace_cb, &action, NULL);
260 return (0);
261 }
263 static void __exit acpi_container_exit(void)
264 {
265 int action = UNINSTALL_NOTIFY_HANDLER;
268 acpi_walk_namespace(ACPI_TYPE_DEVICE,
269 ACPI_ROOT_OBJECT,
270 ACPI_UINT32_MAX,
271 container_walk_namespace_cb, &action, NULL);
273 acpi_bus_unregister_driver(&acpi_container_driver);
275 return;
276 }
278 module_init(acpi_container_init);
279 module_exit(acpi_container_exit);