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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 | |
f52fd66d | 47 | ACPI_MODULE_NAME("container"); |
1da177e4 | 48 | |
f52fd66d | 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 = { | |
c2b6705b | 59 | .name = "container", |
4be44fcd LB |
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 | ||
36bcbec7 | 99 | container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL); |
4be44fcd | 100 | if (!container) |
d550d98d | 101 | return -ENOMEM; |
4be44fcd | 102 | |
1da177e4 LT |
103 | container->handle = device->handle; |
104 | strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME); | |
105 | strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS); | |
106 | acpi_driver_data(device) = container; | |
107 | ||
4be44fcd LB |
108 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n", |
109 | acpi_device_name(device), acpi_device_bid(device))); | |
1da177e4 | 110 | |
d550d98d | 111 | return 0; |
1da177e4 LT |
112 | } |
113 | ||
4be44fcd | 114 | static int acpi_container_remove(struct acpi_device *device, int type) |
1da177e4 | 115 | { |
4be44fcd LB |
116 | acpi_status status = AE_OK; |
117 | struct acpi_container *pc = NULL; | |
1da177e4 | 118 | |
50dd0969 | 119 | pc = acpi_driver_data(device); |
6044ec88 | 120 | kfree(pc); |
1da177e4 LT |
121 | return status; |
122 | } | |
123 | ||
4be44fcd | 124 | static int container_device_add(struct acpi_device **device, acpi_handle handle) |
1da177e4 LT |
125 | { |
126 | acpi_handle phandle; | |
127 | struct acpi_device *pdev; | |
128 | int result; | |
129 | ||
1da177e4 LT |
130 | |
131 | if (acpi_get_parent(handle, &phandle)) { | |
d550d98d | 132 | return -ENODEV; |
1da177e4 LT |
133 | } |
134 | ||
135 | if (acpi_bus_get_device(phandle, &pdev)) { | |
d550d98d | 136 | return -ENODEV; |
1da177e4 LT |
137 | } |
138 | ||
139 | if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) { | |
d550d98d | 140 | return -ENODEV; |
1da177e4 LT |
141 | } |
142 | ||
3fb02738 | 143 | result = acpi_bus_start(*device); |
1da177e4 | 144 | |
d550d98d | 145 | return result; |
1da177e4 LT |
146 | } |
147 | ||
4be44fcd | 148 | static void container_notify_cb(acpi_handle handle, u32 type, void *context) |
1da177e4 | 149 | { |
4be44fcd | 150 | struct acpi_device *device = NULL; |
1da177e4 LT |
151 | int result; |
152 | int present; | |
153 | acpi_status status; | |
154 | ||
1da177e4 LT |
155 | |
156 | present = is_device_present(handle); | |
4be44fcd | 157 | |
1da177e4 LT |
158 | switch (type) { |
159 | case ACPI_NOTIFY_BUS_CHECK: | |
160 | /* Fall through */ | |
161 | case ACPI_NOTIFY_DEVICE_CHECK: | |
162 | printk("Container driver received %s event\n", | |
4be44fcd LB |
163 | (type == ACPI_NOTIFY_BUS_CHECK) ? |
164 | "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"); | |
1da177e4 LT |
165 | status = acpi_bus_get_device(handle, &device); |
166 | if (present) { | |
167 | if (ACPI_FAILURE(status) || !device) { | |
168 | result = container_device_add(&device, handle); | |
169 | if (!result) | |
f883d9db | 170 | kobject_uevent(&device->dev.kobj, |
312c004d | 171 | KOBJ_ONLINE); |
1da177e4 LT |
172 | else |
173 | printk("Failed to add container\n"); | |
174 | } | |
175 | } else { | |
176 | if (ACPI_SUCCESS(status)) { | |
177 | /* device exist and this is a remove request */ | |
f883d9db | 178 | kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); |
1da177e4 LT |
179 | } |
180 | } | |
181 | break; | |
182 | case ACPI_NOTIFY_EJECT_REQUEST: | |
183 | if (!acpi_bus_get_device(handle, &device) && device) { | |
f883d9db | 184 | kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); |
1da177e4 LT |
185 | } |
186 | break; | |
187 | default: | |
188 | break; | |
189 | } | |
d550d98d | 190 | return; |
1da177e4 LT |
191 | } |
192 | ||
193 | static acpi_status | |
194 | container_walk_namespace_cb(acpi_handle handle, | |
4be44fcd | 195 | u32 lvl, void *context, void **rv) |
1da177e4 | 196 | { |
4be44fcd LB |
197 | char *hid = NULL; |
198 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
199 | struct acpi_device_info *info; | |
200 | acpi_status status; | |
201 | int *action = context; | |
1da177e4 | 202 | |
1da177e4 LT |
203 | |
204 | status = acpi_get_object_info(handle, &buffer); | |
205 | if (ACPI_FAILURE(status) || !buffer.pointer) { | |
d550d98d | 206 | return AE_OK; |
1da177e4 LT |
207 | } |
208 | ||
209 | info = buffer.pointer; | |
210 | if (info->valid & ACPI_VALID_HID) | |
211 | hid = info->hardware_id.value; | |
212 | ||
213 | if (hid == NULL) { | |
214 | goto end; | |
215 | } | |
216 | ||
217 | if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") && | |
4be44fcd | 218 | strcmp(hid, "PNP0A06")) { |
1da177e4 LT |
219 | goto end; |
220 | } | |
221 | ||
4be44fcd | 222 | switch (*action) { |
1da177e4 LT |
223 | case INSTALL_NOTIFY_HANDLER: |
224 | acpi_install_notify_handler(handle, | |
4be44fcd LB |
225 | ACPI_SYSTEM_NOTIFY, |
226 | container_notify_cb, NULL); | |
1da177e4 LT |
227 | break; |
228 | case UNINSTALL_NOTIFY_HANDLER: | |
229 | acpi_remove_notify_handler(handle, | |
4be44fcd LB |
230 | ACPI_SYSTEM_NOTIFY, |
231 | container_notify_cb); | |
1da177e4 LT |
232 | break; |
233 | default: | |
234 | break; | |
235 | } | |
236 | ||
4be44fcd | 237 | end: |
02438d87 | 238 | kfree(buffer.pointer); |
1da177e4 | 239 | |
d550d98d | 240 | return AE_OK; |
1da177e4 LT |
241 | } |
242 | ||
4be44fcd | 243 | static int __init acpi_container_init(void) |
1da177e4 | 244 | { |
4be44fcd LB |
245 | int result = 0; |
246 | int action = INSTALL_NOTIFY_HANDLER; | |
1da177e4 LT |
247 | |
248 | result = acpi_bus_register_driver(&acpi_container_driver); | |
249 | if (result < 0) { | |
4be44fcd | 250 | return (result); |
1da177e4 LT |
251 | } |
252 | ||
253 | /* register notify handler to every container device */ | |
254 | acpi_walk_namespace(ACPI_TYPE_DEVICE, | |
4be44fcd LB |
255 | ACPI_ROOT_OBJECT, |
256 | ACPI_UINT32_MAX, | |
257 | container_walk_namespace_cb, &action, NULL); | |
1da177e4 | 258 | |
4be44fcd | 259 | return (0); |
1da177e4 LT |
260 | } |
261 | ||
4be44fcd | 262 | static void __exit acpi_container_exit(void) |
1da177e4 | 263 | { |
4be44fcd | 264 | int action = UNINSTALL_NOTIFY_HANDLER; |
1da177e4 | 265 | |
1da177e4 LT |
266 | |
267 | acpi_walk_namespace(ACPI_TYPE_DEVICE, | |
4be44fcd LB |
268 | ACPI_ROOT_OBJECT, |
269 | ACPI_UINT32_MAX, | |
270 | container_walk_namespace_cb, &action, NULL); | |
1da177e4 LT |
271 | |
272 | acpi_bus_unregister_driver(&acpi_container_driver); | |
273 | ||
d550d98d | 274 | return; |
1da177e4 LT |
275 | } |
276 | ||
277 | module_init(acpi_container_init); | |
278 | module_exit(acpi_container_exit); |