Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | |
4be44fcd | 47 | ACPI_MODULE_NAME("acpi_container") |
1da177e4 | 48 | |
4be44fcd | 49 | MODULE_AUTHOR("Anil S Keshavamurthy"); |
1da177e4 LT |
50 | MODULE_DESCRIPTION(ACPI_CONTAINER_DRIVER_NAME); |
51 | MODULE_LICENSE("GPL"); | |
52 | ||
53 | #define ACPI_STA_PRESENT (0x00000001) | |
54 | ||
55 | static int acpi_container_add(struct acpi_device *device); | |
56 | static int acpi_container_remove(struct acpi_device *device, int type); | |
57 | ||
58 | static struct acpi_driver acpi_container_driver = { | |
4be44fcd LB |
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 | }, | |
1da177e4 LT |
66 | }; |
67 | ||
1da177e4 LT |
68 | /*******************************************************************/ |
69 | ||
4be44fcd | 70 | static int is_device_present(acpi_handle handle) |
1da177e4 | 71 | { |
4be44fcd LB |
72 | acpi_handle temp; |
73 | acpi_status status; | |
74 | unsigned long sta; | |
1da177e4 | 75 | |
1da177e4 LT |
76 | |
77 | status = acpi_get_handle(handle, "_STA", &temp); | |
78 | if (ACPI_FAILURE(status)) | |
d550d98d | 79 | return 1; /* _STA not found, assmue device present */ |
1da177e4 LT |
80 | |
81 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); | |
82 | if (ACPI_FAILURE(status)) | |
d550d98d | 83 | return 0; /* Firmware error */ |
1da177e4 | 84 | |
d550d98d | 85 | return ((sta & ACPI_STA_PRESENT) == ACPI_STA_PRESENT); |
1da177e4 LT |
86 | } |
87 | ||
88 | /*******************************************************************/ | |
4be44fcd | 89 | static int acpi_container_add(struct acpi_device *device) |
1da177e4 LT |
90 | { |
91 | struct acpi_container *container; | |
92 | ||
1da177e4 LT |
93 | |
94 | if (!device) { | |
6468463a | 95 | printk(KERN_ERR PREFIX "device is NULL\n"); |
d550d98d | 96 | return -EINVAL; |
1da177e4 LT |
97 | } |
98 | ||
99 | container = kmalloc(sizeof(struct acpi_container), GFP_KERNEL); | |
4be44fcd | 100 | if (!container) |
d550d98d | 101 | return -ENOMEM; |
4be44fcd | 102 | |
1da177e4 LT |
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; | |
108 | ||
4be44fcd LB |
109 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n", |
110 | acpi_device_name(device), acpi_device_bid(device))); | |
1da177e4 | 111 | |
d550d98d | 112 | return 0; |
1da177e4 LT |
113 | } |
114 | ||
4be44fcd | 115 | static int acpi_container_remove(struct acpi_device *device, int type) |
1da177e4 | 116 | { |
4be44fcd LB |
117 | acpi_status status = AE_OK; |
118 | struct acpi_container *pc = NULL; | |
1da177e4 | 119 | |
50dd0969 | 120 | pc = acpi_driver_data(device); |
6044ec88 | 121 | kfree(pc); |
1da177e4 LT |
122 | return status; |
123 | } | |
124 | ||
4be44fcd | 125 | static int container_device_add(struct acpi_device **device, acpi_handle handle) |
1da177e4 LT |
126 | { |
127 | acpi_handle phandle; | |
128 | struct acpi_device *pdev; | |
129 | int result; | |
130 | ||
1da177e4 LT |
131 | |
132 | if (acpi_get_parent(handle, &phandle)) { | |
d550d98d | 133 | return -ENODEV; |
1da177e4 LT |
134 | } |
135 | ||
136 | if (acpi_bus_get_device(phandle, &pdev)) { | |
d550d98d | 137 | return -ENODEV; |
1da177e4 LT |
138 | } |
139 | ||
140 | if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) { | |
d550d98d | 141 | return -ENODEV; |
1da177e4 LT |
142 | } |
143 | ||
3fb02738 | 144 | result = acpi_bus_start(*device); |
1da177e4 | 145 | |
d550d98d | 146 | return result; |
1da177e4 LT |
147 | } |
148 | ||
4be44fcd | 149 | static void container_notify_cb(acpi_handle handle, u32 type, void *context) |
1da177e4 | 150 | { |
4be44fcd | 151 | struct acpi_device *device = NULL; |
1da177e4 LT |
152 | int result; |
153 | int present; | |
154 | acpi_status status; | |
155 | ||
1da177e4 LT |
156 | |
157 | present = is_device_present(handle); | |
4be44fcd | 158 | |
1da177e4 LT |
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", | |
4be44fcd LB |
164 | (type == ACPI_NOTIFY_BUS_CHECK) ? |
165 | "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"); | |
1da177e4 LT |
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) | |
312c004d KS |
171 | kobject_uevent(&device->kobj, |
172 | KOBJ_ONLINE); | |
1da177e4 LT |
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 */ | |
312c004d | 179 | kobject_uevent(&device->kobj, KOBJ_OFFLINE); |
1da177e4 LT |
180 | } |
181 | } | |
182 | break; | |
183 | case ACPI_NOTIFY_EJECT_REQUEST: | |
184 | if (!acpi_bus_get_device(handle, &device) && device) { | |
312c004d | 185 | kobject_uevent(&device->kobj, KOBJ_OFFLINE); |
1da177e4 LT |
186 | } |
187 | break; | |
188 | default: | |
189 | break; | |
190 | } | |
d550d98d | 191 | return; |
1da177e4 LT |
192 | } |
193 | ||
194 | static acpi_status | |
195 | container_walk_namespace_cb(acpi_handle handle, | |
4be44fcd | 196 | u32 lvl, void *context, void **rv) |
1da177e4 | 197 | { |
4be44fcd LB |
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; | |
1da177e4 | 203 | |
1da177e4 LT |
204 | |
205 | status = acpi_get_object_info(handle, &buffer); | |
206 | if (ACPI_FAILURE(status) || !buffer.pointer) { | |
d550d98d | 207 | return AE_OK; |
1da177e4 LT |
208 | } |
209 | ||
210 | info = buffer.pointer; | |
211 | if (info->valid & ACPI_VALID_HID) | |
212 | hid = info->hardware_id.value; | |
213 | ||
214 | if (hid == NULL) { | |
215 | goto end; | |
216 | } | |
217 | ||
218 | if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") && | |
4be44fcd | 219 | strcmp(hid, "PNP0A06")) { |
1da177e4 LT |
220 | goto end; |
221 | } | |
222 | ||
4be44fcd | 223 | switch (*action) { |
1da177e4 LT |
224 | case INSTALL_NOTIFY_HANDLER: |
225 | acpi_install_notify_handler(handle, | |
4be44fcd LB |
226 | ACPI_SYSTEM_NOTIFY, |
227 | container_notify_cb, NULL); | |
1da177e4 LT |
228 | break; |
229 | case UNINSTALL_NOTIFY_HANDLER: | |
230 | acpi_remove_notify_handler(handle, | |
4be44fcd LB |
231 | ACPI_SYSTEM_NOTIFY, |
232 | container_notify_cb); | |
1da177e4 LT |
233 | break; |
234 | default: | |
235 | break; | |
236 | } | |
237 | ||
4be44fcd | 238 | end: |
02438d87 | 239 | kfree(buffer.pointer); |
1da177e4 | 240 | |
d550d98d | 241 | return AE_OK; |
1da177e4 LT |
242 | } |
243 | ||
4be44fcd | 244 | static int __init acpi_container_init(void) |
1da177e4 | 245 | { |
4be44fcd LB |
246 | int result = 0; |
247 | int action = INSTALL_NOTIFY_HANDLER; | |
1da177e4 LT |
248 | |
249 | result = acpi_bus_register_driver(&acpi_container_driver); | |
250 | if (result < 0) { | |
4be44fcd | 251 | return (result); |
1da177e4 LT |
252 | } |
253 | ||
254 | /* register notify handler to every container device */ | |
255 | acpi_walk_namespace(ACPI_TYPE_DEVICE, | |
4be44fcd LB |
256 | ACPI_ROOT_OBJECT, |
257 | ACPI_UINT32_MAX, | |
258 | container_walk_namespace_cb, &action, NULL); | |
1da177e4 | 259 | |
4be44fcd | 260 | return (0); |
1da177e4 LT |
261 | } |
262 | ||
4be44fcd | 263 | static void __exit acpi_container_exit(void) |
1da177e4 | 264 | { |
4be44fcd | 265 | int action = UNINSTALL_NOTIFY_HANDLER; |
1da177e4 | 266 | |
1da177e4 LT |
267 | |
268 | acpi_walk_namespace(ACPI_TYPE_DEVICE, | |
4be44fcd LB |
269 | ACPI_ROOT_OBJECT, |
270 | ACPI_UINT32_MAX, | |
271 | container_walk_namespace_cb, &action, NULL); | |
1da177e4 LT |
272 | |
273 | acpi_bus_unregister_driver(&acpi_container_driver); | |
274 | ||
d550d98d | 275 | return; |
1da177e4 LT |
276 | } |
277 | ||
278 | module_init(acpi_container_init); | |
279 | module_exit(acpi_container_exit); |