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ACPI: Fix a hard coding style when determining if a device is a container, v3
[~shefty/rdma-dev.git] / drivers / acpi / container.c
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 static bool is_container_device(const char *hid)
96 {
97         const struct acpi_device_id *container_id;
98
99         for (container_id = container_device_ids;
100              container_id->id[0]; container_id++) {
101                 if (!strcmp((char *)container_id->id, hid))
102                         return true;
103         }
104
105         return false;
106 }
107
108 /*******************************************************************/
109 static int acpi_container_add(struct acpi_device *device)
110 {
111         struct acpi_container *container;
112
113
114         if (!device) {
115                 printk(KERN_ERR PREFIX "device is NULL\n");
116                 return -EINVAL;
117         }
118
119         container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL);
120         if (!container)
121                 return -ENOMEM;
122
123         container->handle = device->handle;
124         strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
125         strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
126         device->driver_data = container;
127
128         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",
129                           acpi_device_name(device), acpi_device_bid(device)));
130
131         return 0;
132 }
133
134 static int acpi_container_remove(struct acpi_device *device, int type)
135 {
136         acpi_status status = AE_OK;
137         struct acpi_container *pc = NULL;
138
139         pc = acpi_driver_data(device);
140         kfree(pc);
141         return status;
142 }
143
144 static int container_device_add(struct acpi_device **device, acpi_handle handle)
145 {
146         acpi_handle phandle;
147         struct acpi_device *pdev;
148         int result;
149
150
151         if (acpi_get_parent(handle, &phandle)) {
152                 return -ENODEV;
153         }
154
155         if (acpi_bus_get_device(phandle, &pdev)) {
156                 return -ENODEV;
157         }
158
159         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
160                 return -ENODEV;
161         }
162
163         result = acpi_bus_start(*device);
164
165         return result;
166 }
167
168 static void container_notify_cb(acpi_handle handle, u32 type, void *context)
169 {
170         struct acpi_device *device = NULL;
171         int result;
172         int present;
173         acpi_status status;
174         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
175
176         switch (type) {
177         case ACPI_NOTIFY_BUS_CHECK:
178                 /* Fall through */
179         case ACPI_NOTIFY_DEVICE_CHECK:
180                 printk(KERN_WARNING "Container driver received %s event\n",
181                        (type == ACPI_NOTIFY_BUS_CHECK) ?
182                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
183
184                 present = is_device_present(handle);
185                 status = acpi_bus_get_device(handle, &device);
186                 if (!present) {
187                         if (ACPI_SUCCESS(status)) {
188                                 /* device exist and this is a remove request */
189                                 device->flags.eject_pending = 1;
190                                 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
191                                 return;
192                         }
193                         break;
194                 }
195
196                 if (!ACPI_FAILURE(status) || device)
197                         break;
198
199                 result = container_device_add(&device, handle);
200                 if (result) {
201                         printk(KERN_WARNING "Failed to add container\n");
202                         break;
203                 }
204
205                 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
206                 ost_code = ACPI_OST_SC_SUCCESS;
207                 break;
208
209         case ACPI_NOTIFY_EJECT_REQUEST:
210                 if (!acpi_bus_get_device(handle, &device) && device) {
211                         device->flags.eject_pending = 1;
212                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
213                         return;
214                 }
215                 break;
216
217         default:
218                 /* non-hotplug event; possibly handled by other handler */
219                 return;
220         }
221
222         /* Inform firmware that the hotplug operation has completed */
223         (void) acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL);
224         return;
225 }
226
227 static acpi_status
228 container_walk_namespace_cb(acpi_handle handle,
229                             u32 lvl, void *context, void **rv)
230 {
231         char *hid = NULL;
232         struct acpi_device_info *info;
233         acpi_status status;
234         int *action = context;
235
236         status = acpi_get_object_info(handle, &info);
237         if (ACPI_FAILURE(status)) {
238                 return AE_OK;
239         }
240
241         if (info->valid & ACPI_VALID_HID)
242                 hid = info->hardware_id.string;
243
244         if (hid == NULL) {
245                 goto end;
246         }
247
248         if (!is_container_device(hid))
249                 goto end;
250
251         switch (*action) {
252         case INSTALL_NOTIFY_HANDLER:
253                 acpi_install_notify_handler(handle,
254                                             ACPI_SYSTEM_NOTIFY,
255                                             container_notify_cb, NULL);
256                 break;
257         case UNINSTALL_NOTIFY_HANDLER:
258                 acpi_remove_notify_handler(handle,
259                                            ACPI_SYSTEM_NOTIFY,
260                                            container_notify_cb);
261                 break;
262         default:
263                 break;
264         }
265
266       end:
267         kfree(info);
268
269         return AE_OK;
270 }
271
272 static int __init acpi_container_init(void)
273 {
274         int result = 0;
275         int action = INSTALL_NOTIFY_HANDLER;
276
277         result = acpi_bus_register_driver(&acpi_container_driver);
278         if (result < 0) {
279                 return (result);
280         }
281
282         /* register notify handler to every container device */
283         acpi_walk_namespace(ACPI_TYPE_DEVICE,
284                             ACPI_ROOT_OBJECT,
285                             ACPI_UINT32_MAX,
286                             container_walk_namespace_cb, NULL, &action, NULL);
287
288         return (0);
289 }
290
291 static void __exit acpi_container_exit(void)
292 {
293         int action = UNINSTALL_NOTIFY_HANDLER;
294
295
296         acpi_walk_namespace(ACPI_TYPE_DEVICE,
297                             ACPI_ROOT_OBJECT,
298                             ACPI_UINT32_MAX,
299                             container_walk_namespace_cb, NULL, &action, NULL);
300
301         acpi_bus_unregister_driver(&acpi_container_driver);
302
303         return;
304 }
305
306 module_init(acpi_container_init);
307 module_exit(acpi_container_exit);