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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/slab.h>
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
39 #define PREFIX "ACPI: "
40
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
47 #define _COMPONENT                      ACPI_CONTAINER_COMPONENT
48 ACPI_MODULE_NAME("container");
49
50 MODULE_AUTHOR("Anil S Keshavamurthy");
51 MODULE_DESCRIPTION("ACPI container driver");
52 MODULE_LICENSE("GPL");
53
54 static int acpi_container_add(struct acpi_device *device);
55 static int acpi_container_remove(struct acpi_device *device, int type);
56
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
65 static struct acpi_driver acpi_container_driver = {
66         .name = "container",
67         .class = ACPI_CONTAINER_CLASS,
68         .ids = container_device_ids,
69         .ops = {
70                 .add = acpi_container_add,
71                 .remove = acpi_container_remove,
72                 },
73 };
74
75 /*******************************************************************/
76
77 static int is_device_present(acpi_handle handle)
78 {
79         acpi_handle temp;
80         acpi_status status;
81         unsigned long long sta;
82
83
84         status = acpi_get_handle(handle, "_STA", &temp);
85         if (ACPI_FAILURE(status))
86                 return 1;       /* _STA not found, assume device present */
87
88         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
89         if (ACPI_FAILURE(status))
90                 return 0;       /* Firmware error */
91
92         return ((sta & ACPI_STA_DEVICE_PRESENT) == ACPI_STA_DEVICE_PRESENT);
93 }
94
95 /*******************************************************************/
96 static int acpi_container_add(struct acpi_device *device)
97 {
98         struct acpi_container *container;
99
100
101         if (!device) {
102                 printk(KERN_ERR PREFIX "device is NULL\n");
103                 return -EINVAL;
104         }
105
106         container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL);
107         if (!container)
108                 return -ENOMEM;
109
110         container->handle = device->handle;
111         strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
112         strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
113         device->driver_data = container;
114
115         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",
116                           acpi_device_name(device), acpi_device_bid(device)));
117
118         return 0;
119 }
120
121 static int acpi_container_remove(struct acpi_device *device, int type)
122 {
123         acpi_status status = AE_OK;
124         struct acpi_container *pc = NULL;
125
126         pc = acpi_driver_data(device);
127         kfree(pc);
128         return status;
129 }
130
131 static int container_device_add(struct acpi_device **device, acpi_handle handle)
132 {
133         acpi_handle phandle;
134         struct acpi_device *pdev;
135         int result;
136
137
138         if (acpi_get_parent(handle, &phandle)) {
139                 return -ENODEV;
140         }
141
142         if (acpi_bus_get_device(phandle, &pdev)) {
143                 return -ENODEV;
144         }
145
146         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
147                 return -ENODEV;
148         }
149
150         result = acpi_bus_start(*device);
151
152         return result;
153 }
154
155 static void container_notify_cb(acpi_handle handle, u32 type, void *context)
156 {
157         struct acpi_device *device = NULL;
158         int result;
159         int present;
160         acpi_status status;
161         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
162
163         switch (type) {
164         case ACPI_NOTIFY_BUS_CHECK:
165                 /* Fall through */
166         case ACPI_NOTIFY_DEVICE_CHECK:
167                 printk(KERN_WARNING "Container driver received %s event\n",
168                        (type == ACPI_NOTIFY_BUS_CHECK) ?
169                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
170
171                 present = is_device_present(handle);
172                 status = acpi_bus_get_device(handle, &device);
173                 if (!present) {
174                         if (ACPI_SUCCESS(status)) {
175                                 /* device exist and this is a remove request */
176                                 device->flags.eject_pending = 1;
177                                 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
178                                 return;
179                         }
180                         break;
181                 }
182
183                 if (!ACPI_FAILURE(status) || device)
184                         break;
185
186                 result = container_device_add(&device, handle);
187                 if (result) {
188                         printk(KERN_WARNING "Failed to add container\n");
189                         break;
190                 }
191
192                 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
193                 ost_code = ACPI_OST_SC_SUCCESS;
194                 break;
195
196         case ACPI_NOTIFY_EJECT_REQUEST:
197                 if (!acpi_bus_get_device(handle, &device) && device) {
198                         device->flags.eject_pending = 1;
199                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
200                         return;
201                 }
202                 break;
203
204         default:
205                 /* non-hotplug event; possibly handled by other handler */
206                 return;
207         }
208
209         /* Inform firmware that the hotplug operation has completed */
210         (void) acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL);
211         return;
212 }
213
214 static acpi_status
215 container_walk_namespace_cb(acpi_handle handle,
216                             u32 lvl, void *context, void **rv)
217 {
218         char *hid = NULL;
219         struct acpi_device_info *info;
220         acpi_status status;
221         int *action = context;
222
223         status = acpi_get_object_info(handle, &info);
224         if (ACPI_FAILURE(status)) {
225                 return AE_OK;
226         }
227
228         if (info->valid & ACPI_VALID_HID)
229                 hid = info->hardware_id.string;
230
231         if (hid == NULL) {
232                 goto end;
233         }
234
235         if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") &&
236             strcmp(hid, "PNP0A06")) {
237                 goto end;
238         }
239
240         switch (*action) {
241         case INSTALL_NOTIFY_HANDLER:
242                 acpi_install_notify_handler(handle,
243                                             ACPI_SYSTEM_NOTIFY,
244                                             container_notify_cb, NULL);
245                 break;
246         case UNINSTALL_NOTIFY_HANDLER:
247                 acpi_remove_notify_handler(handle,
248                                            ACPI_SYSTEM_NOTIFY,
249                                            container_notify_cb);
250                 break;
251         default:
252                 break;
253         }
254
255       end:
256         kfree(info);
257
258         return AE_OK;
259 }
260
261 static int __init acpi_container_init(void)
262 {
263         int result = 0;
264         int action = INSTALL_NOTIFY_HANDLER;
265
266         result = acpi_bus_register_driver(&acpi_container_driver);
267         if (result < 0) {
268                 return (result);
269         }
270
271         /* register notify handler to every container device */
272         acpi_walk_namespace(ACPI_TYPE_DEVICE,
273                             ACPI_ROOT_OBJECT,
274                             ACPI_UINT32_MAX,
275                             container_walk_namespace_cb, NULL, &action, NULL);
276
277         return (0);
278 }
279
280 static void __exit acpi_container_exit(void)
281 {
282         int action = UNINSTALL_NOTIFY_HANDLER;
283
284
285         acpi_walk_namespace(ACPI_TYPE_DEVICE,
286                             ACPI_ROOT_OBJECT,
287                             ACPI_UINT32_MAX,
288                             container_walk_namespace_cb, NULL, &action, NULL);
289
290         acpi_bus_unregister_driver(&acpi_container_driver);
291
292         return;
293 }
294
295 module_init(acpi_container_init);
296 module_exit(acpi_container_exit);