[net-next-2.6.git] / drivers / acpi / bay.c

/*
 *  bay.c - ACPI removable drive bay driver
 *
 *  Copyright (C) 2006 Kristen Carlson Accardi <kristen.c.accardi@intel.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  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/notifier.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#include <linux/seq_file.h>
#include <asm/uaccess.h>
#include <linux/platform_device.h>

ACPI_MODULE_NAME("bay");
MODULE_AUTHOR("Kristen Carlson Accardi");
MODULE_DESCRIPTION("ACPI Removable Drive Bay Driver");
MODULE_LICENSE("GPL");
#define ACPI_BAY_CLASS "bay"
#define ACPI_BAY_COMPONENT	0x10000000
#define _COMPONENT ACPI_BAY_COMPONENT
#define bay_dprintk(h,s) {\
	char prefix[80] = {'\0'};\
	struct acpi_buffer buffer = {sizeof(prefix), prefix};\
	acpi_get_name(h, ACPI_FULL_PATHNAME, &buffer);\
	printk(KERN_DEBUG PREFIX "%s: %s\n", prefix, s); }
static void bay_notify(acpi_handle handle, u32 event, void *data);

static const struct acpi_device_id bay_device_ids[] = {
	{"LNXIOBAY", 0},
	{"", 0},
};
MODULE_DEVICE_TABLE(acpi, bay_device_ids);

struct bay {
	acpi_handle handle;
	char *name;
	struct list_head list;
	struct platform_device *pdev;
};

static LIST_HEAD(drive_bays);


/*****************************************************************************
 *                         Drive Bay functions                               *
 *****************************************************************************/
/**
 * is_ejectable - see if a device is ejectable
 * @handle: acpi handle of the device
 *
 * If an acpi object has a _EJ0 method, then it is ejectable
 */
static int is_ejectable(acpi_handle handle)
{
	acpi_status status;
	acpi_handle tmp;

	status = acpi_get_handle(handle, "_EJ0", &tmp);
	if (ACPI_FAILURE(status))
		return 0;
	return 1;
}

/**
 * bay_present - see if the bay device is present
 * @bay: the drive bay
 *
 * execute the _STA method.
 */
static int bay_present(struct bay *bay)
{
	unsigned long sta;
	acpi_status status;

	if (bay) {
		status = acpi_evaluate_integer(bay->handle, "_STA", NULL, &sta);
		if (ACPI_SUCCESS(status) && sta)
			return 1;
	}
	return 0;
}

/**
 * eject_device - respond to an eject request
 * @handle - the device to eject
 *
 * Call this devices _EJ0 method.
 */
static void eject_device(acpi_handle handle)
{
	struct acpi_object_list arg_list;
	union acpi_object arg;

	bay_dprintk(handle, "Ejecting device");

	arg_list.count = 1;
	arg_list.pointer = &arg;
	arg.type = ACPI_TYPE_INTEGER;
	arg.integer.value = 1;

	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_EJ0",
					      &arg_list, NULL)))
		pr_debug("Failed to evaluate _EJ0!\n");
}

/*
 * show_present - read method for "present" file in sysfs
 */
static ssize_t show_present(struct device *dev,
			   struct device_attribute *attr, char *buf)
{
	struct bay *bay = dev_get_drvdata(dev);
	return snprintf(buf, PAGE_SIZE, "%d\n", bay_present(bay));

}
static DEVICE_ATTR(present, S_IRUGO, show_present, NULL);

/*
 * write_eject - write method for "eject" file in sysfs
 */
static ssize_t write_eject(struct device *dev, struct device_attribute *attr,
			   const char *buf, size_t count)
{
	struct bay *bay = dev_get_drvdata(dev);

	if (!count)
		return -EINVAL;

	eject_device(bay->handle);
	return count;
}
static DEVICE_ATTR(eject, S_IWUSR, NULL, write_eject);

/**
 * is_ata - see if a device is an ata device
 * @handle: acpi handle of the device
 *
 * If an acpi object has one of 4 ATA ACPI methods defined,
 * then it is an ATA device
 */
static int is_ata(acpi_handle handle)
{
	acpi_handle tmp;

	if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
	   (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
	   (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
	   (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
		return 1;

	return 0;
}

/**
 * parent_is_ata(acpi_handle handle)
 *
 */
static int parent_is_ata(acpi_handle handle)
{
	acpi_handle phandle;

	if (acpi_get_parent(handle, &phandle))
		return 0;

	return is_ata(phandle);
}

/**
 * is_ejectable_bay - see if a device is an ejectable drive bay
 * @handle: acpi handle of the device
 *
 * If an acpi object is ejectable and has one of the ACPI ATA
 * methods defined, then we can safely call it an ejectable
 * drive bay
 */
static int is_ejectable_bay(acpi_handle handle)
{
	if ((is_ata(handle) || parent_is_ata(handle)) && is_ejectable(handle))
		return 1;
	return 0;
}

#if 0
/**
 * eject_removable_drive - try to eject this drive
 * @dev : the device structure of the drive
 *
 * If a device is a removable drive that requires an _EJ0 method
 * to be executed in order to safely remove from the system, do
 * it.  ATM - always returns success
 */
int eject_removable_drive(struct device *dev)
{
	acpi_handle handle = DEVICE_ACPI_HANDLE(dev);

	if (handle) {
		bay_dprintk(handle, "Got device handle");
		if (is_ejectable_bay(handle))
			eject_device(handle);
	} else {
		printk("No acpi handle for device\n");
	}

	/* should I return an error code? */
	return 0;
}
EXPORT_SYMBOL_GPL(eject_removable_drive);
#endif  /*  0  */

static int acpi_bay_add_fs(struct bay *bay)
{
	int ret;
	struct device *dev = &bay->pdev->dev;

	ret = device_create_file(dev, &dev_attr_present);
	if (ret)
		goto add_fs_err;
	ret = device_create_file(dev, &dev_attr_eject);
	if (ret) {
		device_remove_file(dev, &dev_attr_present);
		goto add_fs_err;
	}
	return 0;

 add_fs_err:
	bay_dprintk(bay->handle, "Error adding sysfs files\n");
	return ret;
}

static void acpi_bay_remove_fs(struct bay *bay)
{
	struct device *dev = &bay->pdev->dev;

	/* cleanup sysfs */
	device_remove_file(dev, &dev_attr_present);
	device_remove_file(dev, &dev_attr_eject);
}

static int bay_is_dock_device(acpi_handle handle)
{
	acpi_handle parent;

	acpi_get_parent(handle, &parent);

	/* if the device or it's parent is dependent on the
	 * dock, then we are a dock device
	 */
	return (is_dock_device(handle) || is_dock_device(parent));
}

static int bay_add(acpi_handle handle, int id)
{
	acpi_status status;
	struct bay *new_bay;
	struct platform_device *pdev;
	struct acpi_buffer nbuffer = {ACPI_ALLOCATE_BUFFER, NULL};
	acpi_get_name(handle, ACPI_FULL_PATHNAME, &nbuffer);

	bay_dprintk(handle, "Adding notify handler");

	/*
	 * Initialize bay device structure
	 */
	new_bay = kzalloc(sizeof(*new_bay), GFP_ATOMIC);
	INIT_LIST_HEAD(&new_bay->list);
	new_bay->handle = handle;
	new_bay->name = (char *)nbuffer.pointer;

	/* initialize platform device stuff */
	pdev = platform_device_register_simple(ACPI_BAY_CLASS, id, NULL, 0);
	if (IS_ERR(pdev)) {
		printk(KERN_ERR PREFIX "Error registering bay device\n");
		goto bay_add_err;
	}
	new_bay->pdev = pdev;
	platform_set_drvdata(pdev, new_bay);

	/*
	 * we want the bay driver to be able to send uevents
	 */
	pdev->dev.uevent_suppress = 0;

	/* register for events on this device */
	status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
			bay_notify, new_bay);
	if (ACPI_FAILURE(status)) {
		printk(KERN_INFO PREFIX "Error installing bay notify handler\n");
		platform_device_unregister(new_bay->pdev);
		goto bay_add_err;
	}

	if (acpi_bay_add_fs(new_bay)) {
		acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
					   bay_notify);
		platform_device_unregister(new_bay->pdev);
		goto bay_add_err;
	}

	/* if we are on a dock station, we should register for dock
	 * notifications.
	 */
	if (bay_is_dock_device(handle)) {
		bay_dprintk(handle, "Is dependent on dock\n");
		register_hotplug_dock_device(handle, bay_notify, new_bay);
	}
	list_add(&new_bay->list, &drive_bays);
	printk(KERN_INFO PREFIX "Bay [%s] Added\n", new_bay->name);
	return 0;

bay_add_err:
	kfree(new_bay->name);
	kfree(new_bay);
	return -ENODEV;
}

/**
 * bay_notify - act upon an acpi bay notification
 * @handle: the bay handle
 * @event: the acpi event
 * @data: our driver data struct
 *
 */
static void bay_notify(acpi_handle handle, u32 event, void *data)
{
	struct bay *bay_dev = (struct bay *)data;
	struct device *dev = &bay_dev->pdev->dev;
	char event_string[12];
	char *envp[] = { event_string, NULL };

	bay_dprintk(handle, "Bay event");
	sprintf(event_string, "BAY_EVENT=%d", event);
	kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
}

static acpi_status
find_bay(acpi_handle handle, u32 lvl, void *context, void **rv)
{
	int *count = (int *)context;

	/*
	 * there could be more than one ejectable bay.
	 * so, just return AE_OK always so that every object
	 * will be checked.
	 */
	if (is_ejectable_bay(handle)) {
		bay_dprintk(handle, "found ejectable bay");
		if (!bay_add(handle, *count))
			(*count)++;
	}
	return AE_OK;
}

static int __init bay_init(void)
{
	int bays = 0;

	INIT_LIST_HEAD(&drive_bays);

	if (acpi_disabled)
		return -ENODEV;

	/* look for dockable drive bays */
	acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
		ACPI_UINT32_MAX, find_bay, &bays, NULL);

	if (!bays)
		return -ENODEV;

	return 0;
}

static void __exit bay_exit(void)
{
	struct bay *bay, *tmp;

	list_for_each_entry_safe(bay, tmp, &drive_bays, list) {
		if (is_dock_device(bay->handle))
			unregister_hotplug_dock_device(bay->handle);
		acpi_bay_remove_fs(bay);
		acpi_remove_notify_handler(bay->handle, ACPI_SYSTEM_NOTIFY,
			bay_notify);
		platform_device_unregister(bay->pdev);
		kfree(bay->name);
		kfree(bay);
	}
}

postcore_initcall(bay_init);
module_exit(bay_exit);
Commit	Line	Data
01b57e73 KCA	1	/*
	2	* bay.c - ACPI removable drive bay driver
	3	*
	4	* Copyright (C) 2006 Kristen Carlson Accardi <kristen.c.accardi@intel.com>
	5	*
	6	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or (at
	11	* your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful, but
	14	* WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	* General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License along
	19	* with this program; if not, write to the Free Software Foundation, Inc.,
	20	* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
	21	*
	22	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	23	*/
	24	#include <linux/kernel.h>
	25	#include <linux/module.h>
	26	#include <linux/init.h>
	27	#include <linux/types.h>
	28	#include <linux/notifier.h>
	29	#include <acpi/acpi_bus.h>
	30	#include <acpi/acpi_drivers.h>
01b57e73 KCA	31	#include <linux/seq_file.h>
01b57e73 KCA	32	#include <asm/uaccess.h>
2b167c01	33	#include <linux/platform_device.h>
01b57e73	34
f52fd66d	35	ACPI_MODULE_NAME("bay");
01b57e73	36	MODULE_AUTHOR("Kristen Carlson Accardi");
7cda93e0	37	MODULE_DESCRIPTION("ACPI Removable Drive Bay Driver");
01b57e73 KCA	38	MODULE_LICENSE("GPL");
	39	#define ACPI_BAY_CLASS "bay"
	40	#define ACPI_BAY_COMPONENT 0x10000000
	41	#define _COMPONENT ACPI_BAY_COMPONENT
	42	#define bay_dprintk(h,s) {\
	43	char prefix[80] = {'\0'};\
	44	struct acpi_buffer buffer = {sizeof(prefix), prefix};\
	45	acpi_get_name(h, ACPI_FULL_PATHNAME, &buffer);\
	46	printk(KERN_DEBUG PREFIX "%s: %s\n", prefix, s); }
01b57e73	47	static void bay_notify(acpi_handle handle, u32 event, void *data);
01b57e73	48
17196d6e TR	49	static const struct acpi_device_id bay_device_ids[] = {
	50	{"LNXIOBAY", 0},
	51	{"", 0},
	52	};
	53	MODULE_DEVICE_TABLE(acpi, bay_device_ids);
	54
01b57e73 KCA	55	struct bay {
	56	acpi_handle handle;
	57	char *name;
	58	struct list_head list;
2b167c01	59	struct platform_device *pdev;
01b57e73 KCA	60	};
01b57e73 KCA	61
5d22e1e8	62	static LIST_HEAD(drive_bays);
01b57e73	63
01b57e73 KCA	64
	65	/*****************************************************************************
	66	* Drive Bay functions *
	67	*****************************************************************************/
	68	/**
	69	* is_ejectable - see if a device is ejectable
	70	* @handle: acpi handle of the device
	71	*
	72	* If an acpi object has a _EJ0 method, then it is ejectable
	73	*/
	74	static int is_ejectable(acpi_handle handle)
	75	{
	76	acpi_status status;
	77	acpi_handle tmp;
	78
	79	status = acpi_get_handle(handle, "_EJ0", &tmp);
	80	if (ACPI_FAILURE(status))
	81	return 0;
	82	return 1;
	83	}
	84
	85	/**
	86	* bay_present - see if the bay device is present
	87	* @bay: the drive bay
	88	*
	89	* execute the _STA method.
	90	*/
	91	static int bay_present(struct bay *bay)
	92	{
	93	unsigned long sta;
	94	acpi_status status;
	95
	96	if (bay) {
	97	status = acpi_evaluate_integer(bay->handle, "_STA", NULL, &sta);
	98	if (ACPI_SUCCESS(status) && sta)
	99	return 1;
	100	}
	101	return 0;
	102	}
	103
	104	/**
	105	* eject_device - respond to an eject request
	106	* @handle - the device to eject
	107	*
	108	* Call this devices _EJ0 method.
	109	*/
	110	static void eject_device(acpi_handle handle)
	111	{
	112	struct acpi_object_list arg_list;
	113	union acpi_object arg;
	114
	115	bay_dprintk(handle, "Ejecting device");
	116
	117	arg_list.count = 1;
	118	arg_list.pointer = &arg;
	119	arg.type = ACPI_TYPE_INTEGER;
	120	arg.integer.value = 1;
	121
	122	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_EJ0",
	123	&arg_list, NULL)))
	124	pr_debug("Failed to evaluate _EJ0!\n");
	125	}
	126
2b167c01 KCA	127	/*
	128	* show_present - read method for "present" file in sysfs
	129	*/
	130	static ssize_t show_present(struct device *dev,
	131	struct device_attribute attr, char buf)
	132	{
	133	struct bay *bay = dev_get_drvdata(dev);
	134	return snprintf(buf, PAGE_SIZE, "%d\n", bay_present(bay));
	135
	136	}
e5685b9d	137	static DEVICE_ATTR(present, S_IRUGO, show_present, NULL);
2b167c01 KCA	138
	139	/*
	140	* write_eject - write method for "eject" file in sysfs
	141	*/
	142	static ssize_t write_eject(struct device dev, struct device_attribute attr,
	143	const char *buf, size_t count)
	144	{
	145	struct bay *bay = dev_get_drvdata(dev);
	146
	147	if (!count)
	148	return -EINVAL;
	149
	150	eject_device(bay->handle);
	151	return count;
	152	}
e5685b9d	153	static DEVICE_ATTR(eject, S_IWUSR, NULL, write_eject);
01b57e73 KCA	154
	155	/**
	156	* is_ata - see if a device is an ata device
	157	* @handle: acpi handle of the device
	158	*
	159	* If an acpi object has one of 4 ATA ACPI methods defined,
	160	* then it is an ATA device
	161	*/
	162	static int is_ata(acpi_handle handle)
	163	{
	164	acpi_handle tmp;
	165
	166	if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) \|\|
	167	(ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) \|\|
	168	(ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) \|\|
	169	(ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
	170	return 1;
	171
	172	return 0;
	173	}
	174
	175	/**
	176	* parent_is_ata(acpi_handle handle)
	177	*
	178	*/
	179	static int parent_is_ata(acpi_handle handle)
	180	{
	181	acpi_handle phandle;
	182
	183	if (acpi_get_parent(handle, &phandle))
	184	return 0;
	185
	186	return is_ata(phandle);
	187	}
	188
	189	/**
	190	* is_ejectable_bay - see if a device is an ejectable drive bay
	191	* @handle: acpi handle of the device
	192	*
	193	* If an acpi object is ejectable and has one of the ACPI ATA
	194	* methods defined, then we can safely call it an ejectable
	195	* drive bay
	196	*/
	197	static int is_ejectable_bay(acpi_handle handle)
	198	{
	199	if ((is_ata(handle) \|\| parent_is_ata(handle)) && is_ejectable(handle))
	200	return 1;
	201	return 0;
	202	}
	203
2a241d77	204	#if 0
01b57e73 KCA	205	/**
	206	* eject_removable_drive - try to eject this drive
	207	* @dev : the device structure of the drive
	208	*
	209	* If a device is a removable drive that requires an _EJ0 method
	210	* to be executed in order to safely remove from the system, do
	211	* it. ATM - always returns success
	212	*/
	213	int eject_removable_drive(struct device *dev)
	214	{
	215	acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
	216
	217	if (handle) {
	218	bay_dprintk(handle, "Got device handle");
	219	if (is_ejectable_bay(handle))
	220	eject_device(handle);
	221	} else {
	222	printk("No acpi handle for device\n");
	223	}
	224
	225	/* should I return an error code? */
	226	return 0;
	227	}
	228	EXPORT_SYMBOL_GPL(eject_removable_drive);
2a241d77	229	#endif /* 0 */
01b57e73	230
01b57e73 KCA	231	static int acpi_bay_add_fs(struct bay *bay)
01b57e73 KCA	232	{
2b167c01 KCA	233	int ret;
	234	struct device *dev = &bay->pdev->dev;
	235
	236	ret = device_create_file(dev, &dev_attr_present);
	237	if (ret)
	238	goto add_fs_err;
	239	ret = device_create_file(dev, &dev_attr_eject);
	240	if (ret) {
	241	device_remove_file(dev, &dev_attr_present);
	242	goto add_fs_err;
	243	}
	244	return 0;
	245
	246	add_fs_err:
	247	bay_dprintk(bay->handle, "Error adding sysfs files\n");
	248	return ret;
01b57e73 KCA	249	}
	250
	251	static void acpi_bay_remove_fs(struct bay *bay)
	252	{
2b167c01 KCA	253	struct device *dev = &bay->pdev->dev;
	254
	255	/* cleanup sysfs */
	256	device_remove_file(dev, &dev_attr_present);
	257	device_remove_file(dev, &dev_attr_eject);
01b57e73 KCA	258	}
	259
	260	static int bay_is_dock_device(acpi_handle handle)
	261	{
	262	acpi_handle parent;
	263
	264	acpi_get_parent(handle, &parent);
	265
	266	/* if the device or it's parent is dependent on the
	267	* dock, then we are a dock device
	268	*/
	269	return (is_dock_device(handle) \|\| is_dock_device(parent));
	270	}
	271
2b167c01	272	static int bay_add(acpi_handle handle, int id)
01b57e73 KCA	273	{
	274	acpi_status status;
	275	struct bay *new_bay;
2b167c01	276	struct platform_device *pdev;
01b57e73 KCA	277	struct acpi_buffer nbuffer = {ACPI_ALLOCATE_BUFFER, NULL};
	278	acpi_get_name(handle, ACPI_FULL_PATHNAME, &nbuffer);
	279
	280	bay_dprintk(handle, "Adding notify handler");
	281
01b57e73 KCA	282	/*
	283	* Initialize bay device structure
	284	*/
a3c94e5c	285	new_bay = kzalloc(sizeof(*new_bay), GFP_ATOMIC);
01b57e73 KCA	286	INIT_LIST_HEAD(&new_bay->list);
	287	new_bay->handle = handle;
	288	new_bay->name = (char *)nbuffer.pointer;
2b167c01 KCA	289
	290	/* initialize platform device stuff */
	291	pdev = platform_device_register_simple(ACPI_BAY_CLASS, id, NULL, 0);
0539771d	292	if (IS_ERR(pdev)) {
2b167c01 KCA	293	printk(KERN_ERR PREFIX "Error registering bay device\n");
	294	goto bay_add_err;
	295	}
	296	new_bay->pdev = pdev;
	297	platform_set_drvdata(pdev, new_bay);
	298
1f9767df KCA	299	/*
	300	* we want the bay driver to be able to send uevents
	301	*/
	302	pdev->dev.uevent_suppress = 0;
	303
01b57e73 KCA	304	/* register for events on this device */
	305	status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
	306	bay_notify, new_bay);
	307	if (ACPI_FAILURE(status)) {
7efd52a4 HM	308	printk(KERN_INFO PREFIX "Error installing bay notify handler\n");
	309	platform_device_unregister(new_bay->pdev);
	310	goto bay_add_err;
	311	}
	312
	313	if (acpi_bay_add_fs(new_bay)) {
	314	acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
	315	bay_notify);
	316	platform_device_unregister(new_bay->pdev);
	317	goto bay_add_err;
01b57e73 KCA	318	}
	319
	320	/* if we are on a dock station, we should register for dock
	321	* notifications.
	322	*/
	323	if (bay_is_dock_device(handle)) {
	324	bay_dprintk(handle, "Is dependent on dock\n");
	325	register_hotplug_dock_device(handle, bay_notify, new_bay);
	326	}
2b167c01	327	list_add(&new_bay->list, &drive_bays);
01b57e73 KCA	328	printk(KERN_INFO PREFIX "Bay [%s] Added\n", new_bay->name);
01b57e73 KCA	329	return 0;
2b167c01 KCA	330
	331	bay_add_err:
	332	kfree(new_bay->name);
	333	kfree(new_bay);
	334	return -ENODEV;
01b57e73 KCA	335	}
01b57e73 KCA	336
01b57e73 KCA	337	/**
	338	* bay_notify - act upon an acpi bay notification
	339	* @handle: the bay handle
	340	* @event: the acpi event
	341	* @data: our driver data struct
	342	*
	343	*/
	344	static void bay_notify(acpi_handle handle, u32 event, void *data)
	345	{
c41458ac KCA	346	struct bay bay_dev = (struct bay )data;
c41458ac KCA	347	struct device *dev = &bay_dev->pdev->dev;
3f8698d4 KCA	348	char event_string[12];
3f8698d4 KCA	349	char *envp[] = { event_string, NULL };
01b57e73 KCA	350
01b57e73 KCA	351	bay_dprintk(handle, "Bay event");
7aa763cb	352	sprintf(event_string, "BAY_EVENT=%d", event);
3f8698d4	353	kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
01b57e73 KCA	354	}
	355
	356	static acpi_status
	357	find_bay(acpi_handle handle, u32 lvl, void context, void *rv)
	358	{
	359	int count = (int )context;
	360
	361	/*
	362	* there could be more than one ejectable bay.
	363	* so, just return AE_OK always so that every object
	364	* will be checked.
	365	*/
	366	if (is_ejectable_bay(handle)) {
	367	bay_dprintk(handle, "found ejectable bay");
2b167c01 KCA	368	if (!bay_add(handle, *count))
2b167c01 KCA	369	(*count)++;
01b57e73 KCA	370	}
	371	return AE_OK;
	372	}
	373
	374	static int __init bay_init(void)
	375	{
	376	int bays = 0;
	377
01b57e73 KCA	378	INIT_LIST_HEAD(&drive_bays);
01b57e73 KCA	379
816c2eda LB	380	if (acpi_disabled)
	381	return -ENODEV;
	382
01b57e73 KCA	383	/* look for dockable drive bays */
	384	acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
	385	ACPI_UINT32_MAX, find_bay, &bays, NULL);
	386
01b57e73 KCA	387	if (!bays)
	388	return -ENODEV;
	389
	390	return 0;
	391	}
	392
	393	static void __exit bay_exit(void)
	394	{
	395	struct bay bay, tmp;
	396
	397	list_for_each_entry_safe(bay, tmp, &drive_bays, list) {
	398	if (is_dock_device(bay->handle))
	399	unregister_hotplug_dock_device(bay->handle);
	400	acpi_bay_remove_fs(bay);
	401	acpi_remove_notify_handler(bay->handle, ACPI_SYSTEM_NOTIFY,
	402	bay_notify);
2b167c01	403	platform_device_unregister(bay->pdev);
01b57e73 KCA	404	kfree(bay->name);
	405	kfree(bay);
	406	}
01b57e73 KCA	407	}
	408
	409	postcore_initcall(bay_init);
	410	module_exit(bay_exit);
	411