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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 | |
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 LT |
75 | |
76 | ACPI_FUNCTION_TRACE("is_device_present"); | |
77 | ||
78 | status = acpi_get_handle(handle, "_STA", &temp); | |
79 | if (ACPI_FAILURE(status)) | |
4be44fcd | 80 | return_VALUE(1); /* _STA not found, assmue device present */ |
1da177e4 LT |
81 | |
82 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); | |
83 | if (ACPI_FAILURE(status)) | |
4be44fcd | 84 | return_VALUE(0); /* Firmware error */ |
1da177e4 LT |
85 | |
86 | return_VALUE((sta & ACPI_STA_PRESENT) == ACPI_STA_PRESENT); | |
87 | } | |
88 | ||
89 | /*******************************************************************/ | |
4be44fcd | 90 | static int acpi_container_add(struct acpi_device *device) |
1da177e4 LT |
91 | { |
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); | |
4be44fcd | 102 | if (!container) |
1da177e4 | 103 | return_VALUE(-ENOMEM); |
4be44fcd | 104 | |
1da177e4 LT |
105 | 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 | ||
4be44fcd LB |
111 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n", |
112 | acpi_device_name(device), acpi_device_bid(device))); | |
1da177e4 LT |
113 | |
114 | return_VALUE(0); | |
115 | } | |
116 | ||
4be44fcd | 117 | static int acpi_container_remove(struct acpi_device *device, int type) |
1da177e4 | 118 | { |
4be44fcd LB |
119 | acpi_status status = AE_OK; |
120 | struct acpi_container *pc = NULL; | |
121 | pc = (struct acpi_container *)acpi_driver_data(device); | |
1da177e4 LT |
122 | |
123 | if (pc) | |
124 | kfree(pc); | |
125 | ||
126 | return status; | |
127 | } | |
128 | ||
4be44fcd | 129 | static int container_device_add(struct acpi_device **device, acpi_handle handle) |
1da177e4 LT |
130 | { |
131 | acpi_handle phandle; | |
132 | struct acpi_device *pdev; | |
133 | int result; | |
134 | ||
135 | ACPI_FUNCTION_TRACE("container_device_add"); | |
136 | ||
137 | if (acpi_get_parent(handle, &phandle)) { | |
138 | return_VALUE(-ENODEV); | |
139 | } | |
140 | ||
141 | if (acpi_bus_get_device(phandle, &pdev)) { | |
142 | return_VALUE(-ENODEV); | |
143 | } | |
144 | ||
145 | if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) { | |
146 | return_VALUE(-ENODEV); | |
147 | } | |
148 | ||
3fb02738 | 149 | result = acpi_bus_start(*device); |
1da177e4 LT |
150 | |
151 | return_VALUE(result); | |
152 | } | |
153 | ||
4be44fcd | 154 | static void container_notify_cb(acpi_handle handle, u32 type, void *context) |
1da177e4 | 155 | { |
4be44fcd | 156 | struct acpi_device *device = NULL; |
1da177e4 LT |
157 | int result; |
158 | int present; | |
159 | acpi_status status; | |
160 | ||
161 | ACPI_FUNCTION_TRACE("container_notify_cb"); | |
162 | ||
163 | present = is_device_present(handle); | |
4be44fcd | 164 | |
1da177e4 LT |
165 | switch (type) { |
166 | case ACPI_NOTIFY_BUS_CHECK: | |
167 | /* Fall through */ | |
168 | case ACPI_NOTIFY_DEVICE_CHECK: | |
169 | printk("Container driver received %s event\n", | |
4be44fcd LB |
170 | (type == ACPI_NOTIFY_BUS_CHECK) ? |
171 | "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"); | |
1da177e4 LT |
172 | status = acpi_bus_get_device(handle, &device); |
173 | if (present) { | |
174 | if (ACPI_FAILURE(status) || !device) { | |
175 | result = container_device_add(&device, handle); | |
176 | if (!result) | |
177 | kobject_hotplug(&device->kobj, | |
178 | KOBJ_ONLINE); | |
179 | else | |
180 | printk("Failed to add container\n"); | |
181 | } | |
182 | } else { | |
183 | if (ACPI_SUCCESS(status)) { | |
184 | /* device exist and this is a remove request */ | |
185 | kobject_hotplug(&device->kobj, KOBJ_OFFLINE); | |
186 | } | |
187 | } | |
188 | break; | |
189 | case ACPI_NOTIFY_EJECT_REQUEST: | |
190 | if (!acpi_bus_get_device(handle, &device) && device) { | |
191 | kobject_hotplug(&device->kobj, KOBJ_OFFLINE); | |
192 | } | |
193 | break; | |
194 | default: | |
195 | break; | |
196 | } | |
197 | return_VOID; | |
198 | } | |
199 | ||
200 | static acpi_status | |
201 | container_walk_namespace_cb(acpi_handle handle, | |
4be44fcd | 202 | u32 lvl, void *context, void **rv) |
1da177e4 | 203 | { |
4be44fcd LB |
204 | char *hid = NULL; |
205 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
206 | struct acpi_device_info *info; | |
207 | acpi_status status; | |
208 | int *action = context; | |
1da177e4 LT |
209 | |
210 | ACPI_FUNCTION_TRACE("container_walk_namespace_cb"); | |
211 | ||
212 | status = acpi_get_object_info(handle, &buffer); | |
213 | if (ACPI_FAILURE(status) || !buffer.pointer) { | |
214 | return_ACPI_STATUS(AE_OK); | |
215 | } | |
216 | ||
217 | info = buffer.pointer; | |
218 | if (info->valid & ACPI_VALID_HID) | |
219 | hid = info->hardware_id.value; | |
220 | ||
221 | if (hid == NULL) { | |
222 | goto end; | |
223 | } | |
224 | ||
225 | if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") && | |
4be44fcd | 226 | strcmp(hid, "PNP0A06")) { |
1da177e4 LT |
227 | goto end; |
228 | } | |
229 | ||
4be44fcd | 230 | switch (*action) { |
1da177e4 LT |
231 | case INSTALL_NOTIFY_HANDLER: |
232 | acpi_install_notify_handler(handle, | |
4be44fcd LB |
233 | ACPI_SYSTEM_NOTIFY, |
234 | container_notify_cb, NULL); | |
1da177e4 LT |
235 | break; |
236 | case UNINSTALL_NOTIFY_HANDLER: | |
237 | acpi_remove_notify_handler(handle, | |
4be44fcd LB |
238 | ACPI_SYSTEM_NOTIFY, |
239 | container_notify_cb); | |
1da177e4 LT |
240 | break; |
241 | default: | |
242 | break; | |
243 | } | |
244 | ||
4be44fcd | 245 | end: |
1da177e4 LT |
246 | acpi_os_free(buffer.pointer); |
247 | ||
248 | return_ACPI_STATUS(AE_OK); | |
249 | } | |
250 | ||
4be44fcd | 251 | static int __init acpi_container_init(void) |
1da177e4 | 252 | { |
4be44fcd LB |
253 | int result = 0; |
254 | int action = INSTALL_NOTIFY_HANDLER; | |
1da177e4 LT |
255 | |
256 | result = acpi_bus_register_driver(&acpi_container_driver); | |
257 | if (result < 0) { | |
4be44fcd | 258 | return (result); |
1da177e4 LT |
259 | } |
260 | ||
261 | /* register notify handler to every container device */ | |
262 | acpi_walk_namespace(ACPI_TYPE_DEVICE, | |
4be44fcd LB |
263 | ACPI_ROOT_OBJECT, |
264 | ACPI_UINT32_MAX, | |
265 | container_walk_namespace_cb, &action, NULL); | |
1da177e4 | 266 | |
4be44fcd | 267 | return (0); |
1da177e4 LT |
268 | } |
269 | ||
4be44fcd | 270 | static void __exit acpi_container_exit(void) |
1da177e4 | 271 | { |
4be44fcd | 272 | int action = UNINSTALL_NOTIFY_HANDLER; |
1da177e4 LT |
273 | |
274 | ACPI_FUNCTION_TRACE("acpi_container_exit"); | |
275 | ||
276 | acpi_walk_namespace(ACPI_TYPE_DEVICE, | |
4be44fcd LB |
277 | ACPI_ROOT_OBJECT, |
278 | ACPI_UINT32_MAX, | |
279 | container_walk_namespace_cb, &action, NULL); | |
1da177e4 LT |
280 | |
281 | acpi_bus_unregister_driver(&acpi_container_driver); | |
282 | ||
283 | return_VOID; | |
284 | } | |
285 | ||
286 | module_init(acpi_container_init); | |
287 | module_exit(acpi_container_exit); |