[GitHub/mt8127/android_kernel_alcatel_ttab.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_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");

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, assume device present */

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

	return ((sta & ACPI_STA_DEVICE_PRESENT) == ACPI_STA_DEVICE_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);
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
1da177e4 LT	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
f52fd66d	46	ACPI_MODULE_NAME("container");
1da177e4	47
f52fd66d	48	MODULE_AUTHOR("Anil S Keshavamurthy");
7cda93e0	49	MODULE_DESCRIPTION("ACPI container driver");
1da177e4 LT	50	MODULE_LICENSE("GPL");
1da177e4 LT	51
1da177e4 LT	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 struct acpi_driver acpi_container_driver = {
c2b6705b	56	.name = "container",
4be44fcd LB	57	.class = ACPI_CONTAINER_CLASS,
	58	.ids = "ACPI0004,PNP0A05,PNP0A06",
	59	.ops = {
	60	.add = acpi_container_add,
	61	.remove = acpi_container_remove,
	62	},
1da177e4 LT	63	};
1da177e4 LT	64
1da177e4 LT	65	/*******************************************************************/
1da177e4 LT	66
4be44fcd	67	static int is_device_present(acpi_handle handle)
1da177e4	68	{
4be44fcd LB	69	acpi_handle temp;
	70	acpi_status status;
	71	unsigned long sta;
1da177e4	72
1da177e4 LT	73
	74	status = acpi_get_handle(handle, "_STA", &temp);
	75	if (ACPI_FAILURE(status))
a0bd4ac4	76	return 1; /* _STA not found, assume device present */
1da177e4 LT	77
	78	status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
	79	if (ACPI_FAILURE(status))
d550d98d	80	return 0; /* Firmware error */
1da177e4	81
a0bd4ac4	82	return ((sta & ACPI_STA_DEVICE_PRESENT) == ACPI_STA_DEVICE_PRESENT);
1da177e4 LT	83	}
	84
	85	/*******************************************************************/
4be44fcd	86	static int acpi_container_add(struct acpi_device *device)
1da177e4 LT	87	{
	88	struct acpi_container *container;
	89
1da177e4 LT	90
1da177e4 LT	91	if (!device) {
6468463a	92	printk(KERN_ERR PREFIX "device is NULL\n");
d550d98d	93	return -EINVAL;
1da177e4 LT	94	}
1da177e4 LT	95
36bcbec7	96	container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL);
4be44fcd	97	if (!container)
d550d98d	98	return -ENOMEM;
4be44fcd	99
1da177e4 LT	100	container->handle = device->handle;
	101	strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
	102	strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
	103	acpi_driver_data(device) = container;
	104
4be44fcd LB	105	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",
4be44fcd LB	106	acpi_device_name(device), acpi_device_bid(device)));
1da177e4	107
d550d98d	108	return 0;
1da177e4 LT	109	}
1da177e4 LT	110
4be44fcd	111	static int acpi_container_remove(struct acpi_device *device, int type)
1da177e4	112	{
4be44fcd LB	113	acpi_status status = AE_OK;
4be44fcd LB	114	struct acpi_container *pc = NULL;
1da177e4	115
50dd0969	116	pc = acpi_driver_data(device);
6044ec88	117	kfree(pc);
1da177e4 LT	118	return status;
	119	}
	120
4be44fcd	121	static int container_device_add(struct acpi_device **device, acpi_handle handle)
1da177e4 LT	122	{
	123	acpi_handle phandle;
	124	struct acpi_device *pdev;
	125	int result;
	126
1da177e4 LT	127
1da177e4 LT	128	if (acpi_get_parent(handle, &phandle)) {
d550d98d	129	return -ENODEV;
1da177e4 LT	130	}
	131
	132	if (acpi_bus_get_device(phandle, &pdev)) {
d550d98d	133	return -ENODEV;
1da177e4 LT	134	}
	135
	136	if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
d550d98d	137	return -ENODEV;
1da177e4 LT	138	}
1da177e4 LT	139
3fb02738	140	result = acpi_bus_start(*device);
1da177e4	141
d550d98d	142	return result;
1da177e4 LT	143	}
1da177e4 LT	144
4be44fcd	145	static void container_notify_cb(acpi_handle handle, u32 type, void *context)
1da177e4	146	{
4be44fcd	147	struct acpi_device *device = NULL;
1da177e4 LT	148	int result;
	149	int present;
	150	acpi_status status;
	151
1da177e4 LT	152
1da177e4 LT	153	present = is_device_present(handle);
4be44fcd	154
1da177e4 LT	155	switch (type) {
	156	case ACPI_NOTIFY_BUS_CHECK:
	157	/* Fall through */
	158	case ACPI_NOTIFY_DEVICE_CHECK:
	159	printk("Container driver received %s event\n",
4be44fcd LB	160	(type == ACPI_NOTIFY_BUS_CHECK) ?
4be44fcd LB	161	"ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
1da177e4 LT	162	status = acpi_bus_get_device(handle, &device);
	163	if (present) {
	164	if (ACPI_FAILURE(status) \|\| !device) {
	165	result = container_device_add(&device, handle);
	166	if (!result)
f883d9db	167	kobject_uevent(&device->dev.kobj,
312c004d	168	KOBJ_ONLINE);
1da177e4 LT	169	else
	170	printk("Failed to add container\n");
	171	}
	172	} else {
	173	if (ACPI_SUCCESS(status)) {
	174	/* device exist and this is a remove request */
f883d9db	175	kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
1da177e4 LT	176	}
	177	}
	178	break;
	179	case ACPI_NOTIFY_EJECT_REQUEST:
	180	if (!acpi_bus_get_device(handle, &device) && device) {
f883d9db	181	kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
1da177e4 LT	182	}
	183	break;
	184	default:
	185	break;
	186	}
d550d98d	187	return;
1da177e4 LT	188	}
	189
	190	static acpi_status
	191	container_walk_namespace_cb(acpi_handle handle,
4be44fcd	192	u32 lvl, void context, void *rv)
1da177e4	193	{
4be44fcd LB	194	char *hid = NULL;
	195	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	196	struct acpi_device_info *info;
	197	acpi_status status;
	198	int *action = context;
1da177e4	199
1da177e4 LT	200
	201	status = acpi_get_object_info(handle, &buffer);
	202	if (ACPI_FAILURE(status) \|\| !buffer.pointer) {
d550d98d	203	return AE_OK;
1da177e4 LT	204	}
	205
	206	info = buffer.pointer;
	207	if (info->valid & ACPI_VALID_HID)
	208	hid = info->hardware_id.value;
	209
	210	if (hid == NULL) {
	211	goto end;
	212	}
	213
	214	if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") &&
4be44fcd	215	strcmp(hid, "PNP0A06")) {
1da177e4 LT	216	goto end;
	217	}
	218
4be44fcd	219	switch (*action) {
1da177e4 LT	220	case INSTALL_NOTIFY_HANDLER:
1da177e4 LT	221	acpi_install_notify_handler(handle,
4be44fcd LB	222	ACPI_SYSTEM_NOTIFY,
4be44fcd LB	223	container_notify_cb, NULL);
1da177e4 LT	224	break;
	225	case UNINSTALL_NOTIFY_HANDLER:
	226	acpi_remove_notify_handler(handle,
4be44fcd LB	227	ACPI_SYSTEM_NOTIFY,
4be44fcd LB	228	container_notify_cb);
1da177e4 LT	229	break;
	230	default:
	231	break;
	232	}
	233
4be44fcd	234	end:
02438d87	235	kfree(buffer.pointer);
1da177e4	236
d550d98d	237	return AE_OK;
1da177e4 LT	238	}
1da177e4 LT	239
4be44fcd	240	static int __init acpi_container_init(void)
1da177e4	241	{
4be44fcd LB	242	int result = 0;
4be44fcd LB	243	int action = INSTALL_NOTIFY_HANDLER;
1da177e4 LT	244
	245	result = acpi_bus_register_driver(&acpi_container_driver);
	246	if (result < 0) {
4be44fcd	247	return (result);
1da177e4 LT	248	}
	249
	250	/* register notify handler to every container device */
	251	acpi_walk_namespace(ACPI_TYPE_DEVICE,
4be44fcd LB	252	ACPI_ROOT_OBJECT,
	253	ACPI_UINT32_MAX,
	254	container_walk_namespace_cb, &action, NULL);
1da177e4	255
4be44fcd	256	return (0);
1da177e4 LT	257	}
1da177e4 LT	258
4be44fcd	259	static void __exit acpi_container_exit(void)
1da177e4	260	{
4be44fcd	261	int action = UNINSTALL_NOTIFY_HANDLER;
1da177e4	262
1da177e4 LT	263
1da177e4 LT	264	acpi_walk_namespace(ACPI_TYPE_DEVICE,
4be44fcd LB	265	ACPI_ROOT_OBJECT,
	266	ACPI_UINT32_MAX,
	267	container_walk_namespace_cb, &action, NULL);
1da177e4 LT	268
	269	acpi_bus_unregister_driver(&acpi_container_driver);
	270
d550d98d	271	return;
1da177e4 LT	272	}
	273
	274	module_init(acpi_container_init);
	275	module_exit(acpi_container_exit);