summaryrefslogtreecommitdiff
path: root/drivers/acpi/container.c
blob: 0930d9413dfa31768e889e7150e9dd55a0691670 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
/*
 * acpi_container.c  - ACPI Generic Container Driver
 * ($Revision: )
 *
 * Copyright (C) 2004 Anil S Keshavamurthy (anil.s.keshavamurthy@intel.com)
 * Copyright (C) 2004 Keiichiro Tokunaga (tokunaga.keiich@jp.fujitsu.com)
 * Copyright (C) 2004 Motoyuki Ito (motoyuki@soft.fujitsu.com)
 * Copyright (C) 2004 Intel Corp.
 * Copyright (C) 2004 FUJITSU LIMITED
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or (at
 *  your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/acpi.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#include <acpi/container.h>

#define ACPI_CONTAINER_DEVICE_NAME	"ACPI container device"
#define ACPI_CONTAINER_CLASS		"container"

#define INSTALL_NOTIFY_HANDLER		1
#define UNINSTALL_NOTIFY_HANDLER	2

#define ACPI_CONTAINER_COMPONENT	0x01000000
#define _COMPONENT			ACPI_CONTAINER_COMPONENT
ACPI_MODULE_NAME("container");

MODULE_AUTHOR("Anil S Keshavamurthy");
MODULE_DESCRIPTION("ACPI container driver");
MODULE_LICENSE("GPL");

#define ACPI_STA_PRESENT		(0x00000001)

static int acpi_container_add(struct acpi_device *device);
static int acpi_container_remove(struct acpi_device *device, int type);

static struct acpi_driver acpi_container_driver = {
	.name = "container",
	.class = ACPI_CONTAINER_CLASS,
	.ids = "ACPI0004,PNP0A05,PNP0A06",
	.ops = {
		.add = acpi_container_add,
		.remove = acpi_container_remove,
		},
};

/*******************************************************************/

static int is_device_present(acpi_handle handle)
{
	acpi_handle temp;
	acpi_status status;
	unsigned long sta;


	status = acpi_get_handle(handle, "_STA", &temp);
	if (ACPI_FAILURE(status))
		return 1;	/* _STA not found, assmue device present */

	status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
	if (ACPI_FAILURE(status))
		return 0;	/* Firmware error */

	return ((sta & ACPI_STA_PRESENT) == ACPI_STA_PRESENT);
}

/*******************************************************************/
static int acpi_container_add(struct acpi_device *device)
{
	struct acpi_container *container;


	if (!device) {
		printk(KERN_ERR PREFIX "device is NULL\n");
		return -EINVAL;
	}

	container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL);
	if (!container)
		return -ENOMEM;

	container->handle = device->handle;
	strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
	strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
	acpi_driver_data(device) = container;

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",
			  acpi_device_name(device), acpi_device_bid(device)));

	return 0;
}

static int acpi_container_remove(struct acpi_device *device, int type)
{
	acpi_status status = AE_OK;
	struct acpi_container *pc = NULL;

	pc = acpi_driver_data(device);
	kfree(pc);
	return status;
}

static int container_device_add(struct acpi_device **device, acpi_handle handle)
{
	acpi_handle phandle;
	struct acpi_device *pdev;
	int result;


	if (acpi_get_parent(handle, &phandle)) {
		return -ENODEV;
	}

	if (acpi_bus_get_device(phandle, &pdev)) {
		return -ENODEV;
	}

	if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
		return -ENODEV;
	}

	result = acpi_bus_start(*device);

	return result;
}

static void container_notify_cb(acpi_handle handle, u32 type, void *context)
{
	struct acpi_device *device = NULL;
	int result;
	int present;
	acpi_status status;


	present = is_device_present(handle);

	switch (type) {
	case ACPI_NOTIFY_BUS_CHECK:
		/* Fall through */
	case ACPI_NOTIFY_DEVICE_CHECK:
		printk("Container driver received %s event\n",
		       (type == ACPI_NOTIFY_BUS_CHECK) ?
		       "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
		status = acpi_bus_get_device(handle, &device);
		if (present) {
			if (ACPI_FAILURE(status) || !device) {
				result = container_device_add(&device, handle);
				if (!result)
					kobject_uevent(&device->dev.kobj,
						       KOBJ_ONLINE);
				else
					printk("Failed to add container\n");
			}
		} else {
			if (ACPI_SUCCESS(status)) {
				/* device exist and this is a remove request */
				kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
			}
		}
		break;
	case ACPI_NOTIFY_EJECT_REQUEST:
		if (!acpi_bus_get_device(handle, &device) && device) {
			kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
		}
		break;
	default:
		break;
	}
	return;
}

static acpi_status
container_walk_namespace_cb(acpi_handle handle,
			    u32 lvl, void *context, void **rv)
{
	char *hid = NULL;
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	struct acpi_device_info *info;
	acpi_status status;
	int *action = context;


	status = acpi_get_object_info(handle, &buffer);
	if (ACPI_FAILURE(status) || !buffer.pointer) {
		return AE_OK;
	}

	info = buffer.pointer;
	if (info->valid & ACPI_VALID_HID)
		hid = info->hardware_id.value;

	if (hid == NULL) {
		goto end;
	}

	if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") &&
	    strcmp(hid, "PNP0A06")) {
		goto end;
	}

	switch (*action) {
	case INSTALL_NOTIFY_HANDLER:
		acpi_install_notify_handler(handle,
					    ACPI_SYSTEM_NOTIFY,
					    container_notify_cb, NULL);
		break;
	case UNINSTALL_NOTIFY_HANDLER:
		acpi_remove_notify_handler(handle,
					   ACPI_SYSTEM_NOTIFY,
					   container_notify_cb);
		break;
	default:
		break;
	}

      end:
	kfree(buffer.pointer);

	return AE_OK;
}

static int __init acpi_container_init(void)
{
	int result = 0;
	int action = INSTALL_NOTIFY_HANDLER;

	result = acpi_bus_register_driver(&acpi_container_driver);
	if (result < 0) {
		return (result);
	}

	/* register notify handler to every container device */
	acpi_walk_namespace(ACPI_TYPE_DEVICE,
			    ACPI_ROOT_OBJECT,
			    ACPI_UINT32_MAX,
			    container_walk_namespace_cb, &action, NULL);

	return (0);
}

static void __exit acpi_container_exit(void)
{
	int action = UNINSTALL_NOTIFY_HANDLER;


	acpi_walk_namespace(ACPI_TYPE_DEVICE,
			    ACPI_ROOT_OBJECT,
			    ACPI_UINT32_MAX,
			    container_walk_namespace_cb, &action, NULL);

	acpi_bus_unregister_driver(&acpi_container_driver);

	return;
}

module_init(acpi_container_init);
module_exit(acpi_container_exit);