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/drivers/acpi/container.c

https://bitbucket.org/evzijst/gittest
C | 303 lines | 213 code | 57 blank | 33 comment | 27 complexity | 7e141f7c974136a95df8cad3ff9387a0 MD5 | raw file
  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_DRIVER_NAME	"ACPI container driver"
 39#define ACPI_CONTAINER_DEVICE_NAME	"ACPI container device"
 40#define ACPI_CONTAINER_CLASS		"container"
 41
 42#define INSTALL_NOTIFY_HANDLER		1
 43#define UNINSTALL_NOTIFY_HANDLER	2
 44
 45#define ACPI_CONTAINER_COMPONENT	0x01000000
 46#define _COMPONENT			ACPI_CONTAINER_COMPONENT
 47ACPI_MODULE_NAME			("acpi_container")
 48
 49MODULE_AUTHOR("Anil S Keshavamurthy");
 50MODULE_DESCRIPTION(ACPI_CONTAINER_DRIVER_NAME);
 51MODULE_LICENSE("GPL");
 52
 53#define ACPI_STA_PRESENT		(0x00000001)
 54
 55static int acpi_container_add(struct acpi_device *device);
 56static int acpi_container_remove(struct acpi_device *device, int type);
 57
 58static struct acpi_driver acpi_container_driver = {
 59	.name =		ACPI_CONTAINER_DRIVER_NAME,
 60	.class =	ACPI_CONTAINER_CLASS,
 61	.ids =		"ACPI0004,PNP0A05,PNP0A06",
 62	.ops =		{
 63				.add =		acpi_container_add,
 64				.remove =	acpi_container_remove,
 65			},
 66};
 67
 68
 69/*******************************************************************/
 70
 71static int
 72is_device_present(acpi_handle handle)
 73{
 74	acpi_handle		temp;
 75	acpi_status		status;
 76	unsigned long	sta;
 77
 78	ACPI_FUNCTION_TRACE("is_device_present");
 79
 80	status = acpi_get_handle(handle, "_STA", &temp);
 81	if (ACPI_FAILURE(status))
 82		return_VALUE(1); /* _STA not found, assmue device present */
 83
 84	status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 85	if (ACPI_FAILURE(status))
 86		return_VALUE(0); /* Firmware error */
 87
 88	return_VALUE((sta & ACPI_STA_PRESENT) == ACPI_STA_PRESENT);
 89}
 90
 91/*******************************************************************/
 92static int
 93acpi_container_add(struct acpi_device *device)
 94{
 95	struct acpi_container *container;
 96
 97	ACPI_FUNCTION_TRACE("acpi_container_add");
 98
 99	if (!device) {
100		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "device is NULL\n"));
101		return_VALUE(-EINVAL);
102	}
103
104	container = kmalloc(sizeof(struct acpi_container), GFP_KERNEL);
105	if(!container)
106		return_VALUE(-ENOMEM);
107	
108	memset(container, 0, sizeof(struct acpi_container));
109	container->handle = device->handle;
110	strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
111	strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
112	acpi_driver_data(device) = container;
113
114	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",	\
115		acpi_device_name(device), acpi_device_bid(device)));
116
117
118	return_VALUE(0);
119}
120
121static int
122acpi_container_remove(struct acpi_device *device, int type)
123{
124	acpi_status		status = AE_OK;
125	struct acpi_container	*pc = NULL;
126	pc = (struct acpi_container*) acpi_driver_data(device);
127
128	if (pc)
129		kfree(pc);
130
131	return status;
132}
133
134
135static int
136container_device_add(struct acpi_device **device, acpi_handle handle)
137{
138	acpi_handle phandle;
139	struct acpi_device *pdev;
140	int result;
141
142	ACPI_FUNCTION_TRACE("container_device_add");
143
144	if (acpi_get_parent(handle, &phandle)) {
145		return_VALUE(-ENODEV);
146	}
147
148	if (acpi_bus_get_device(phandle, &pdev)) {
149		return_VALUE(-ENODEV);
150	}
151
152	if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
153		return_VALUE(-ENODEV);
154	}
155
156	result = acpi_bus_scan(*device);
157
158	return_VALUE(result);
159}
160
161static void
162container_notify_cb(acpi_handle handle, u32 type, void *context)
163{
164	struct acpi_device		*device = NULL;
165	int result;
166	int present;
167	acpi_status status;
168
169	ACPI_FUNCTION_TRACE("container_notify_cb");
170
171	present = is_device_present(handle);
172	
173	switch (type) {
174	case ACPI_NOTIFY_BUS_CHECK:
175		/* Fall through */
176	case ACPI_NOTIFY_DEVICE_CHECK:
177		printk("Container driver received %s event\n",
178			(type == ACPI_NOTIFY_BUS_CHECK)?
179			"ACPI_NOTIFY_BUS_CHECK":"ACPI_NOTIFY_DEVICE_CHECK");
180		status = acpi_bus_get_device(handle, &device);
181		if (present) {
182			if (ACPI_FAILURE(status) || !device) {
183				result = container_device_add(&device, handle);
184				if (!result)
185					kobject_hotplug(&device->kobj,
186							KOBJ_ONLINE);
187				else
188					printk("Failed to add container\n");
189			}
190		} else {
191			if (ACPI_SUCCESS(status)) {
192				/* device exist and this is a remove request */
193				kobject_hotplug(&device->kobj, KOBJ_OFFLINE);
194			}
195		}
196		break;
197	case ACPI_NOTIFY_EJECT_REQUEST:
198		if (!acpi_bus_get_device(handle, &device) && device) {
199			kobject_hotplug(&device->kobj, KOBJ_OFFLINE);
200		}
201		break;
202	default:
203		break;
204	}
205	return_VOID;
206}
207
208static acpi_status
209container_walk_namespace_cb(acpi_handle handle,
210	u32 lvl,
211	void *context,
212	void **rv)
213{
214	char 				*hid = NULL;
215	struct acpi_buffer 		buffer = {ACPI_ALLOCATE_BUFFER, NULL};
216	struct acpi_device_info 	*info;
217	acpi_status 			status;
218	int 				*action = context;
219
220	ACPI_FUNCTION_TRACE("container_walk_namespace_cb");
221
222	status = acpi_get_object_info(handle, &buffer);
223	if (ACPI_FAILURE(status) || !buffer.pointer) {
224		return_ACPI_STATUS(AE_OK);
225	}
226
227	info = buffer.pointer;
228	if (info->valid & ACPI_VALID_HID)
229		hid = info->hardware_id.value;
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,
245			NULL);
246		break;
247	case UNINSTALL_NOTIFY_HANDLER:
248		acpi_remove_notify_handler(handle,
249			ACPI_SYSTEM_NOTIFY,
250			container_notify_cb);
251		break;
252	default:
253		break;
254	}
255
256end:
257	acpi_os_free(buffer.pointer);
258
259	return_ACPI_STATUS(AE_OK);
260}
261
262
263static int __init
264acpi_container_init(void)
265{
266	int	result = 0;
267	int	action = INSTALL_NOTIFY_HANDLER;
268
269	result = acpi_bus_register_driver(&acpi_container_driver);
270	if (result < 0) {
271		return(result);
272	}
273
274	/* register notify handler to every container device */
275	acpi_walk_namespace(ACPI_TYPE_DEVICE,
276				     ACPI_ROOT_OBJECT,
277				     ACPI_UINT32_MAX,
278				     container_walk_namespace_cb,
279				     &action, NULL);
280
281	return(0);
282}
283
284static void __exit
285acpi_container_exit(void)
286{
287	int			action = UNINSTALL_NOTIFY_HANDLER;
288
289	ACPI_FUNCTION_TRACE("acpi_container_exit");
290
291	acpi_walk_namespace(ACPI_TYPE_DEVICE,
292				     ACPI_ROOT_OBJECT,
293				     ACPI_UINT32_MAX,
294				     container_walk_namespace_cb,
295				     &action, NULL);
296
297	acpi_bus_unregister_driver(&acpi_container_driver);
298
299	return_VOID;
300}
301
302module_init(acpi_container_init);
303module_exit(acpi_container_exit);