[linux-2.6-block.git] / drivers / acpi / container.c

/*
 * 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_DRIVER_NAME	"ACPI container driver"
#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("acpi_container")

    MODULE_AUTHOR("Anil S Keshavamurthy");
MODULE_DESCRIPTION(ACPI_CONTAINER_DRIVER_NAME);
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 = ACPI_CONTAINER_DRIVER_NAME,
	.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;

	ACPI_FUNCTION_TRACE("is_device_present");

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

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

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

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

	ACPI_FUNCTION_TRACE("acpi_container_add");

	if (!device) {
		ACPI_ERROR((AE_INFO, "device is NULL"));
		return_VALUE(-EINVAL);
	}

	container = kmalloc(sizeof(struct acpi_container), GFP_KERNEL);
	if (!container)
		return_VALUE(-ENOMEM);

	memset(container, 0, sizeof(struct acpi_container));
	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_VALUE(0);
}

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

	pc = (struct acpi_container *)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;

	ACPI_FUNCTION_TRACE("container_device_add");

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

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

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

	result = acpi_bus_start(*device);

	return_VALUE(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;

	ACPI_FUNCTION_TRACE("container_notify_cb");

	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->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->kobj, KOBJ_OFFLINE);
			}
		}
		break;
	case ACPI_NOTIFY_EJECT_REQUEST:
		if (!acpi_bus_get_device(handle, &device) && device) {
			kobject_uevent(&device->kobj, KOBJ_OFFLINE);
		}
		break;
	default:
		break;
	}
	return_VOID;
}

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;

	ACPI_FUNCTION_TRACE("container_walk_namespace_cb");

	status = acpi_get_object_info(handle, &buffer);
	if (ACPI_FAILURE(status) || !buffer.pointer) {
		return_ACPI_STATUS(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:
	acpi_os_free(buffer.pointer);

	return_ACPI_STATUS(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_FUNCTION_TRACE("acpi_container_exit");

	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_VOID;
}

module_init(acpi_container_init);
module_exit(acpi_container_exit);
Commit	Line	Data
1da177e4 LT	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
4be44fcd	47	ACPI_MODULE_NAME("acpi_container")
1da177e4	48
4be44fcd	49	MODULE_AUTHOR("Anil S Keshavamurthy");
1da177e4 LT	50	MODULE_DESCRIPTION(ACPI_CONTAINER_DRIVER_NAME);
	51	MODULE_LICENSE("GPL");
	52
	53	#define ACPI_STA_PRESENT (0x00000001)
	54
	55	static int acpi_container_add(struct acpi_device *device);
	56	static int acpi_container_remove(struct acpi_device *device, int type);
	57
	58	static struct acpi_driver acpi_container_driver = {
4be44fcd LB	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	},
1da177e4 LT	66	};
1da177e4 LT	67
1da177e4 LT	68	/*******************************************************************/
1da177e4 LT	69
4be44fcd	70	static int is_device_present(acpi_handle handle)
1da177e4	71	{
4be44fcd LB	72	acpi_handle temp;
	73	acpi_status status;
	74	unsigned long sta;
1da177e4 LT	75
	76	ACPI_FUNCTION_TRACE("is_device_present");
	77
	78	status = acpi_get_handle(handle, "_STA", &temp);
	79	if (ACPI_FAILURE(status))
4be44fcd	80	return_VALUE(1); /* _STA not found, assmue device present */
1da177e4 LT	81
	82	status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
	83	if (ACPI_FAILURE(status))
4be44fcd	84	return_VALUE(0); /* Firmware error */
1da177e4 LT	85
	86	return_VALUE((sta & ACPI_STA_PRESENT) == ACPI_STA_PRESENT);
	87	}
	88
	89	/*******************************************************************/
4be44fcd	90	static int acpi_container_add(struct acpi_device *device)
1da177e4 LT	91	{
	92	struct acpi_container *container;
	93
	94	ACPI_FUNCTION_TRACE("acpi_container_add");
	95
	96	if (!device) {
a6fc6720	97	ACPI_ERROR((AE_INFO, "device is NULL"));
1da177e4 LT	98	return_VALUE(-EINVAL);
	99	}
	100
	101	container = kmalloc(sizeof(struct acpi_container), GFP_KERNEL);
4be44fcd	102	if (!container)
1da177e4	103	return_VALUE(-ENOMEM);
4be44fcd	104
1da177e4 LT	105	memset(container, 0, sizeof(struct acpi_container));
	106	container->handle = device->handle;
	107	strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
	108	strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
	109	acpi_driver_data(device) = container;
	110
4be44fcd LB	111	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",
4be44fcd LB	112	acpi_device_name(device), acpi_device_bid(device)));
1da177e4 LT	113
	114	return_VALUE(0);
	115	}
	116
4be44fcd	117	static int acpi_container_remove(struct acpi_device *device, int type)
1da177e4	118	{
4be44fcd LB	119	acpi_status status = AE_OK;
4be44fcd LB	120	struct acpi_container *pc = NULL;
1da177e4	121
6044ec88 JJ	122	pc = (struct acpi_container *)acpi_driver_data(device);
6044ec88 JJ	123	kfree(pc);
1da177e4 LT	124	return status;
	125	}
	126
4be44fcd	127	static int container_device_add(struct acpi_device **device, acpi_handle handle)
1da177e4 LT	128	{
	129	acpi_handle phandle;
	130	struct acpi_device *pdev;
	131	int result;
	132
	133	ACPI_FUNCTION_TRACE("container_device_add");
	134
	135	if (acpi_get_parent(handle, &phandle)) {
	136	return_VALUE(-ENODEV);
	137	}
	138
	139	if (acpi_bus_get_device(phandle, &pdev)) {
	140	return_VALUE(-ENODEV);
	141	}
	142
	143	if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
	144	return_VALUE(-ENODEV);
	145	}
	146
3fb02738	147	result = acpi_bus_start(*device);
1da177e4 LT	148
	149	return_VALUE(result);
	150	}
	151
4be44fcd	152	static void container_notify_cb(acpi_handle handle, u32 type, void *context)
1da177e4	153	{
4be44fcd	154	struct acpi_device *device = NULL;
1da177e4 LT	155	int result;
	156	int present;
	157	acpi_status status;
	158
	159	ACPI_FUNCTION_TRACE("container_notify_cb");
	160
	161	present = is_device_present(handle);
4be44fcd	162
1da177e4 LT	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",
4be44fcd LB	168	(type == ACPI_NOTIFY_BUS_CHECK) ?
4be44fcd LB	169	"ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
1da177e4 LT	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)
312c004d KS	175	kobject_uevent(&device->kobj,
312c004d KS	176	KOBJ_ONLINE);
1da177e4 LT	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 */
312c004d	183	kobject_uevent(&device->kobj, KOBJ_OFFLINE);
1da177e4 LT	184	}
	185	}
	186	break;
	187	case ACPI_NOTIFY_EJECT_REQUEST:
	188	if (!acpi_bus_get_device(handle, &device) && device) {
312c004d	189	kobject_uevent(&device->kobj, KOBJ_OFFLINE);
1da177e4 LT	190	}
	191	break;
	192	default:
	193	break;
	194	}
	195	return_VOID;
	196	}
	197
	198	static acpi_status
	199	container_walk_namespace_cb(acpi_handle handle,
4be44fcd	200	u32 lvl, void context, void *rv)
1da177e4	201	{
4be44fcd LB	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;
1da177e4 LT	207
	208	ACPI_FUNCTION_TRACE("container_walk_namespace_cb");
	209
	210	status = acpi_get_object_info(handle, &buffer);
	211	if (ACPI_FAILURE(status) \|\| !buffer.pointer) {
	212	return_ACPI_STATUS(AE_OK);
	213	}
	214
	215	info = buffer.pointer;
	216	if (info->valid & ACPI_VALID_HID)
	217	hid = info->hardware_id.value;
	218
	219	if (hid == NULL) {
	220	goto end;
	221	}
	222
	223	if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") &&
4be44fcd	224	strcmp(hid, "PNP0A06")) {
1da177e4 LT	225	goto end;
	226	}
	227
4be44fcd	228	switch (*action) {
1da177e4 LT	229	case INSTALL_NOTIFY_HANDLER:
1da177e4 LT	230	acpi_install_notify_handler(handle,
4be44fcd LB	231	ACPI_SYSTEM_NOTIFY,
4be44fcd LB	232	container_notify_cb, NULL);
1da177e4 LT	233	break;
	234	case UNINSTALL_NOTIFY_HANDLER:
	235	acpi_remove_notify_handler(handle,
4be44fcd LB	236	ACPI_SYSTEM_NOTIFY,
4be44fcd LB	237	container_notify_cb);
1da177e4 LT	238	break;
	239	default:
	240	break;
	241	}
	242
4be44fcd	243	end:
1da177e4 LT	244	acpi_os_free(buffer.pointer);
	245
	246	return_ACPI_STATUS(AE_OK);
	247	}
	248
4be44fcd	249	static int __init acpi_container_init(void)
1da177e4	250	{
4be44fcd LB	251	int result = 0;
4be44fcd LB	252	int action = INSTALL_NOTIFY_HANDLER;
1da177e4 LT	253
	254	result = acpi_bus_register_driver(&acpi_container_driver);
	255	if (result < 0) {
4be44fcd	256	return (result);
1da177e4 LT	257	}
	258
	259	/* register notify handler to every container device */
	260	acpi_walk_namespace(ACPI_TYPE_DEVICE,
4be44fcd LB	261	ACPI_ROOT_OBJECT,
	262	ACPI_UINT32_MAX,
	263	container_walk_namespace_cb, &action, NULL);
1da177e4	264
4be44fcd	265	return (0);
1da177e4 LT	266	}
1da177e4 LT	267
4be44fcd	268	static void __exit acpi_container_exit(void)
1da177e4	269	{
4be44fcd	270	int action = UNINSTALL_NOTIFY_HANDLER;
1da177e4 LT	271
	272	ACPI_FUNCTION_TRACE("acpi_container_exit");
	273
	274	acpi_walk_namespace(ACPI_TYPE_DEVICE,
4be44fcd LB	275	ACPI_ROOT_OBJECT,
	276	ACPI_UINT32_MAX,
	277	container_walk_namespace_cb, &action, NULL);
1da177e4 LT	278
	279	acpi_bus_unregister_driver(&acpi_container_driver);
	280
	281	return_VOID;
	282	}
	283
	284	module_init(acpi_container_init);
	285	module_exit(acpi_container_exit);