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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> | |
5a0e3ad6 | 32 | #include <linux/slab.h> |
1da177e4 LT |
33 | #include <linux/types.h> |
34 | #include <linux/acpi.h> | |
35 | #include <acpi/acpi_bus.h> | |
36 | #include <acpi/acpi_drivers.h> | |
37 | #include <acpi/container.h> | |
38 | ||
a192a958 LB |
39 | #define PREFIX "ACPI: " |
40 | ||
1da177e4 LT |
41 | #define ACPI_CONTAINER_DEVICE_NAME "ACPI container device" |
42 | #define ACPI_CONTAINER_CLASS "container" | |
43 | ||
44 | #define INSTALL_NOTIFY_HANDLER 1 | |
45 | #define UNINSTALL_NOTIFY_HANDLER 2 | |
46 | ||
1da177e4 | 47 | #define _COMPONENT ACPI_CONTAINER_COMPONENT |
f52fd66d | 48 | ACPI_MODULE_NAME("container"); |
1da177e4 | 49 | |
f52fd66d | 50 | MODULE_AUTHOR("Anil S Keshavamurthy"); |
7cda93e0 | 51 | MODULE_DESCRIPTION("ACPI container driver"); |
1da177e4 LT |
52 | MODULE_LICENSE("GPL"); |
53 | ||
1da177e4 LT |
54 | static int acpi_container_add(struct acpi_device *device); |
55 | static int acpi_container_remove(struct acpi_device *device, int type); | |
56 | ||
1ba90e3a TR |
57 | static const struct acpi_device_id container_device_ids[] = { |
58 | {"ACPI0004", 0}, | |
59 | {"PNP0A05", 0}, | |
60 | {"PNP0A06", 0}, | |
61 | {"", 0}, | |
62 | }; | |
63 | MODULE_DEVICE_TABLE(acpi, container_device_ids); | |
64 | ||
1da177e4 | 65 | static struct acpi_driver acpi_container_driver = { |
c2b6705b | 66 | .name = "container", |
4be44fcd | 67 | .class = ACPI_CONTAINER_CLASS, |
1ba90e3a | 68 | .ids = container_device_ids, |
4be44fcd LB |
69 | .ops = { |
70 | .add = acpi_container_add, | |
71 | .remove = acpi_container_remove, | |
72 | }, | |
1da177e4 LT |
73 | }; |
74 | ||
1da177e4 LT |
75 | /*******************************************************************/ |
76 | ||
4be44fcd | 77 | static int is_device_present(acpi_handle handle) |
1da177e4 | 78 | { |
4be44fcd LB |
79 | acpi_handle temp; |
80 | acpi_status status; | |
27663c58 | 81 | unsigned long long sta; |
1da177e4 | 82 | |
1da177e4 LT |
83 | |
84 | status = acpi_get_handle(handle, "_STA", &temp); | |
85 | if (ACPI_FAILURE(status)) | |
a0bd4ac4 | 86 | return 1; /* _STA not found, assume device present */ |
1da177e4 LT |
87 | |
88 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); | |
89 | if (ACPI_FAILURE(status)) | |
d550d98d | 90 | return 0; /* Firmware error */ |
1da177e4 | 91 | |
a0bd4ac4 | 92 | return ((sta & ACPI_STA_DEVICE_PRESENT) == ACPI_STA_DEVICE_PRESENT); |
1da177e4 LT |
93 | } |
94 | ||
95 | /*******************************************************************/ | |
4be44fcd | 96 | static int acpi_container_add(struct acpi_device *device) |
1da177e4 LT |
97 | { |
98 | struct acpi_container *container; | |
99 | ||
1da177e4 LT |
100 | |
101 | if (!device) { | |
6468463a | 102 | printk(KERN_ERR PREFIX "device is NULL\n"); |
d550d98d | 103 | return -EINVAL; |
1da177e4 LT |
104 | } |
105 | ||
36bcbec7 | 106 | container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL); |
4be44fcd | 107 | if (!container) |
d550d98d | 108 | return -ENOMEM; |
4be44fcd | 109 | |
1da177e4 LT |
110 | container->handle = device->handle; |
111 | strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME); | |
112 | strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS); | |
db89b4f0 | 113 | device->driver_data = container; |
1da177e4 | 114 | |
4be44fcd LB |
115 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n", |
116 | acpi_device_name(device), acpi_device_bid(device))); | |
1da177e4 | 117 | |
d550d98d | 118 | return 0; |
1da177e4 LT |
119 | } |
120 | ||
4be44fcd | 121 | static int acpi_container_remove(struct acpi_device *device, int type) |
1da177e4 | 122 | { |
4be44fcd LB |
123 | acpi_status status = AE_OK; |
124 | struct acpi_container *pc = NULL; | |
1da177e4 | 125 | |
50dd0969 | 126 | pc = acpi_driver_data(device); |
6044ec88 | 127 | kfree(pc); |
1da177e4 LT |
128 | return status; |
129 | } | |
130 | ||
4be44fcd | 131 | static int container_device_add(struct acpi_device **device, acpi_handle handle) |
1da177e4 LT |
132 | { |
133 | acpi_handle phandle; | |
134 | struct acpi_device *pdev; | |
135 | int result; | |
136 | ||
1da177e4 LT |
137 | |
138 | if (acpi_get_parent(handle, &phandle)) { | |
d550d98d | 139 | return -ENODEV; |
1da177e4 LT |
140 | } |
141 | ||
142 | if (acpi_bus_get_device(phandle, &pdev)) { | |
d550d98d | 143 | return -ENODEV; |
1da177e4 LT |
144 | } |
145 | ||
146 | if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) { | |
d550d98d | 147 | return -ENODEV; |
1da177e4 LT |
148 | } |
149 | ||
3fb02738 | 150 | result = acpi_bus_start(*device); |
1da177e4 | 151 | |
d550d98d | 152 | return result; |
1da177e4 LT |
153 | } |
154 | ||
4be44fcd | 155 | static void container_notify_cb(acpi_handle handle, u32 type, void *context) |
1da177e4 | 156 | { |
4be44fcd | 157 | struct acpi_device *device = NULL; |
1da177e4 LT |
158 | int result; |
159 | int present; | |
160 | acpi_status status; | |
161 | ||
1da177e4 LT |
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: | |
4d939155 | 169 | printk(KERN_WARNING "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) | |
f883d9db | 177 | kobject_uevent(&device->dev.kobj, |
312c004d | 178 | KOBJ_ONLINE); |
1da177e4 | 179 | else |
4d939155 FS |
180 | printk(KERN_WARNING |
181 | "Failed to add container\n"); | |
1da177e4 LT |
182 | } |
183 | } else { | |
184 | if (ACPI_SUCCESS(status)) { | |
185 | /* device exist and this is a remove request */ | |
f883d9db | 186 | kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); |
1da177e4 LT |
187 | } |
188 | } | |
189 | break; | |
190 | case ACPI_NOTIFY_EJECT_REQUEST: | |
191 | if (!acpi_bus_get_device(handle, &device) && device) { | |
f883d9db | 192 | kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); |
1da177e4 LT |
193 | } |
194 | break; | |
195 | default: | |
196 | break; | |
197 | } | |
d550d98d | 198 | return; |
1da177e4 LT |
199 | } |
200 | ||
201 | static acpi_status | |
202 | container_walk_namespace_cb(acpi_handle handle, | |
4be44fcd | 203 | u32 lvl, void *context, void **rv) |
1da177e4 | 204 | { |
4be44fcd | 205 | char *hid = NULL; |
4be44fcd LB |
206 | struct acpi_device_info *info; |
207 | acpi_status status; | |
208 | int *action = context; | |
1da177e4 | 209 | |
15b8dd53 BM |
210 | status = acpi_get_object_info(handle, &info); |
211 | if (ACPI_FAILURE(status)) { | |
d550d98d | 212 | return AE_OK; |
1da177e4 LT |
213 | } |
214 | ||
1da177e4 | 215 | if (info->valid & ACPI_VALID_HID) |
15b8dd53 | 216 | hid = info->hardware_id.string; |
1da177e4 LT |
217 | |
218 | if (hid == NULL) { | |
219 | goto end; | |
220 | } | |
221 | ||
222 | if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") && | |
4be44fcd | 223 | strcmp(hid, "PNP0A06")) { |
1da177e4 LT |
224 | goto end; |
225 | } | |
226 | ||
4be44fcd | 227 | switch (*action) { |
1da177e4 LT |
228 | case INSTALL_NOTIFY_HANDLER: |
229 | acpi_install_notify_handler(handle, | |
4be44fcd LB |
230 | ACPI_SYSTEM_NOTIFY, |
231 | container_notify_cb, NULL); | |
1da177e4 LT |
232 | break; |
233 | case UNINSTALL_NOTIFY_HANDLER: | |
234 | acpi_remove_notify_handler(handle, | |
4be44fcd LB |
235 | ACPI_SYSTEM_NOTIFY, |
236 | container_notify_cb); | |
1da177e4 LT |
237 | break; |
238 | default: | |
239 | break; | |
240 | } | |
241 | ||
4be44fcd | 242 | end: |
15b8dd53 | 243 | kfree(info); |
1da177e4 | 244 | |
d550d98d | 245 | return AE_OK; |
1da177e4 LT |
246 | } |
247 | ||
4be44fcd | 248 | static int __init acpi_container_init(void) |
1da177e4 | 249 | { |
4be44fcd LB |
250 | int result = 0; |
251 | int action = INSTALL_NOTIFY_HANDLER; | |
1da177e4 LT |
252 | |
253 | result = acpi_bus_register_driver(&acpi_container_driver); | |
254 | if (result < 0) { | |
4be44fcd | 255 | return (result); |
1da177e4 LT |
256 | } |
257 | ||
258 | /* register notify handler to every container device */ | |
259 | acpi_walk_namespace(ACPI_TYPE_DEVICE, | |
4be44fcd LB |
260 | ACPI_ROOT_OBJECT, |
261 | ACPI_UINT32_MAX, | |
2263576c | 262 | container_walk_namespace_cb, NULL, &action, NULL); |
1da177e4 | 263 | |
4be44fcd | 264 | return (0); |
1da177e4 LT |
265 | } |
266 | ||
4be44fcd | 267 | static void __exit acpi_container_exit(void) |
1da177e4 | 268 | { |
4be44fcd | 269 | int action = UNINSTALL_NOTIFY_HANDLER; |
1da177e4 | 270 | |
1da177e4 LT |
271 | |
272 | acpi_walk_namespace(ACPI_TYPE_DEVICE, | |
4be44fcd LB |
273 | ACPI_ROOT_OBJECT, |
274 | ACPI_UINT32_MAX, | |
2263576c | 275 | container_walk_namespace_cb, NULL, &action, NULL); |
1da177e4 LT |
276 | |
277 | acpi_bus_unregister_driver(&acpi_container_driver); | |
278 | ||
d550d98d | 279 | return; |
1da177e4 LT |
280 | } |
281 | ||
282 | module_init(acpi_container_init); | |
283 | module_exit(acpi_container_exit); |