xref: /openbmc/linux/drivers/acpi/container.c (revision 22246614)
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_DEVICE_NAME	"ACPI container device"
39 #define ACPI_CONTAINER_CLASS		"container"
40 
41 #define INSTALL_NOTIFY_HANDLER		1
42 #define UNINSTALL_NOTIFY_HANDLER	2
43 
44 #define ACPI_CONTAINER_COMPONENT	0x01000000
45 #define _COMPONENT			ACPI_CONTAINER_COMPONENT
46 ACPI_MODULE_NAME("container");
47 
48 MODULE_AUTHOR("Anil S Keshavamurthy");
49 MODULE_DESCRIPTION("ACPI container driver");
50 MODULE_LICENSE("GPL");
51 
52 static int acpi_container_add(struct acpi_device *device);
53 static int acpi_container_remove(struct acpi_device *device, int type);
54 
55 static const struct acpi_device_id container_device_ids[] = {
56 	{"ACPI0004", 0},
57 	{"PNP0A05", 0},
58 	{"PNP0A06", 0},
59 	{"", 0},
60 };
61 MODULE_DEVICE_TABLE(acpi, container_device_ids);
62 
63 static struct acpi_driver acpi_container_driver = {
64 	.name = "container",
65 	.class = ACPI_CONTAINER_CLASS,
66 	.ids = container_device_ids,
67 	.ops = {
68 		.add = acpi_container_add,
69 		.remove = acpi_container_remove,
70 		},
71 };
72 
73 /*******************************************************************/
74 
75 static int is_device_present(acpi_handle handle)
76 {
77 	acpi_handle temp;
78 	acpi_status status;
79 	unsigned long sta;
80 
81 
82 	status = acpi_get_handle(handle, "_STA", &temp);
83 	if (ACPI_FAILURE(status))
84 		return 1;	/* _STA not found, assume device present */
85 
86 	status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
87 	if (ACPI_FAILURE(status))
88 		return 0;	/* Firmware error */
89 
90 	return ((sta & ACPI_STA_DEVICE_PRESENT) == ACPI_STA_DEVICE_PRESENT);
91 }
92 
93 /*******************************************************************/
94 static int acpi_container_add(struct acpi_device *device)
95 {
96 	struct acpi_container *container;
97 
98 
99 	if (!device) {
100 		printk(KERN_ERR PREFIX "device is NULL\n");
101 		return -EINVAL;
102 	}
103 
104 	container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL);
105 	if (!container)
106 		return -ENOMEM;
107 
108 	container->handle = device->handle;
109 	strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
110 	strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
111 	acpi_driver_data(device) = container;
112 
113 	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",
114 			  acpi_device_name(device), acpi_device_bid(device)));
115 
116 	return 0;
117 }
118 
119 static int acpi_container_remove(struct acpi_device *device, int type)
120 {
121 	acpi_status status = AE_OK;
122 	struct acpi_container *pc = NULL;
123 
124 	pc = acpi_driver_data(device);
125 	kfree(pc);
126 	return status;
127 }
128 
129 static int container_device_add(struct acpi_device **device, acpi_handle handle)
130 {
131 	acpi_handle phandle;
132 	struct acpi_device *pdev;
133 	int result;
134 
135 
136 	if (acpi_get_parent(handle, &phandle)) {
137 		return -ENODEV;
138 	}
139 
140 	if (acpi_bus_get_device(phandle, &pdev)) {
141 		return -ENODEV;
142 	}
143 
144 	if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
145 		return -ENODEV;
146 	}
147 
148 	result = acpi_bus_start(*device);
149 
150 	return result;
151 }
152 
153 static void container_notify_cb(acpi_handle handle, u32 type, void *context)
154 {
155 	struct acpi_device *device = NULL;
156 	int result;
157 	int present;
158 	acpi_status status;
159 
160 
161 	present = is_device_present(handle);
162 
163 	switch (type) {
164 	case ACPI_NOTIFY_BUS_CHECK:
165 		/* Fall through */
166 	case ACPI_NOTIFY_DEVICE_CHECK:
167 		printk("Container driver received %s event\n",
168 		       (type == ACPI_NOTIFY_BUS_CHECK) ?
169 		       "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
170 		status = acpi_bus_get_device(handle, &device);
171 		if (present) {
172 			if (ACPI_FAILURE(status) || !device) {
173 				result = container_device_add(&device, handle);
174 				if (!result)
175 					kobject_uevent(&device->dev.kobj,
176 						       KOBJ_ONLINE);
177 				else
178 					printk("Failed to add container\n");
179 			}
180 		} else {
181 			if (ACPI_SUCCESS(status)) {
182 				/* device exist and this is a remove request */
183 				kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
184 			}
185 		}
186 		break;
187 	case ACPI_NOTIFY_EJECT_REQUEST:
188 		if (!acpi_bus_get_device(handle, &device) && device) {
189 			kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
190 		}
191 		break;
192 	default:
193 		break;
194 	}
195 	return;
196 }
197 
198 static acpi_status
199 container_walk_namespace_cb(acpi_handle handle,
200 			    u32 lvl, void *context, void **rv)
201 {
202 	char *hid = NULL;
203 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
204 	struct acpi_device_info *info;
205 	acpi_status status;
206 	int *action = context;
207 
208 
209 	status = acpi_get_object_info(handle, &buffer);
210 	if (ACPI_FAILURE(status) || !buffer.pointer) {
211 		return AE_OK;
212 	}
213 
214 	info = buffer.pointer;
215 	if (info->valid & ACPI_VALID_HID)
216 		hid = info->hardware_id.value;
217 
218 	if (hid == NULL) {
219 		goto end;
220 	}
221 
222 	if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") &&
223 	    strcmp(hid, "PNP0A06")) {
224 		goto end;
225 	}
226 
227 	switch (*action) {
228 	case INSTALL_NOTIFY_HANDLER:
229 		acpi_install_notify_handler(handle,
230 					    ACPI_SYSTEM_NOTIFY,
231 					    container_notify_cb, NULL);
232 		break;
233 	case UNINSTALL_NOTIFY_HANDLER:
234 		acpi_remove_notify_handler(handle,
235 					   ACPI_SYSTEM_NOTIFY,
236 					   container_notify_cb);
237 		break;
238 	default:
239 		break;
240 	}
241 
242       end:
243 	kfree(buffer.pointer);
244 
245 	return AE_OK;
246 }
247 
248 static int __init acpi_container_init(void)
249 {
250 	int result = 0;
251 	int action = INSTALL_NOTIFY_HANDLER;
252 
253 	result = acpi_bus_register_driver(&acpi_container_driver);
254 	if (result < 0) {
255 		return (result);
256 	}
257 
258 	/* register notify handler to every container device */
259 	acpi_walk_namespace(ACPI_TYPE_DEVICE,
260 			    ACPI_ROOT_OBJECT,
261 			    ACPI_UINT32_MAX,
262 			    container_walk_namespace_cb, &action, NULL);
263 
264 	return (0);
265 }
266 
267 static void __exit acpi_container_exit(void)
268 {
269 	int action = UNINSTALL_NOTIFY_HANDLER;
270 
271 
272 	acpi_walk_namespace(ACPI_TYPE_DEVICE,
273 			    ACPI_ROOT_OBJECT,
274 			    ACPI_UINT32_MAX,
275 			    container_walk_namespace_cb, &action, NULL);
276 
277 	acpi_bus_unregister_driver(&acpi_container_driver);
278 
279 	return;
280 }
281 
282 module_init(acpi_container_init);
283 module_exit(acpi_container_exit);
284