Commit f883d9db authored by Patrick Mochel's avatar Patrick Mochel Committed by Len Brown
Browse files

ACPI: convert to sysfs framework 



Setup new sysfs framework

1.	Remove /sys/firmware/acpi
2.	Add ACPI device in device tree.

File "eject" for every device that has _EJ0 method is moved from
/sys/firmware to /sys/devices.
Operation on this file is exactly the same as before.
i.e. echo 1 to "eject" will cause hot removal of this device.
Corresponding changes should be made in userspace for hot removal.

Signed-off-by: default avatarLi Shaohua <shaohua.li@intel.com>
Signed-off-by: default avatarZhang <Rui&lt;rui.zhang@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent a7178df5

drivers/acpi/bus.c

+1 −1
Original line number Diff line number Diff line
@@ -195,7 +195,7 @@ int acpi_bus_set_power(acpi_handle handle, int state) 


	if (!device->flags.power_manageable) {

		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",

				device->kobj.name));

				device->dev.kobj.name));

		return -ENODEV;

	}

	/*

drivers/acpi/container.c

+3 −3
Original line number Diff line number Diff line
@@ -168,7 +168,7 @@ static void container_notify_cb(acpi_handle handle, u32 type, void *context) 
			if (ACPI_FAILURE(status) || !device) {

				result = container_device_add(&device, handle);

				if (!result)

					kobject_uevent(&device->kobj,

					kobject_uevent(&device->dev.kobj,

						       KOBJ_ONLINE);

				else

					printk("Failed to add container\n");
@@ -176,13 +176,13 @@ static void container_notify_cb(acpi_handle handle, u32 type, void *context) 
		} else {

			if (ACPI_SUCCESS(status)) {

				/* device exist and this is a remove request */

				kobject_uevent(&device->kobj, KOBJ_OFFLINE);

				kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);

			}

		}

		break;

	case ACPI_NOTIFY_EJECT_REQUEST:

		if (!acpi_bus_get_device(handle, &device) && device) {

			kobject_uevent(&device->kobj, KOBJ_OFFLINE);

			kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);

		}

		break;

	default:

drivers/acpi/processor_core.c

+4 −4
Original line number Diff line number Diff line
@@ -711,7 +711,7 @@ int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device) 
		return -ENODEV;



	if ((pr->id >= 0) && (pr->id < NR_CPUS)) {

		kobject_uevent(&(*device)->kobj, KOBJ_ONLINE);

		kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);

	}

	return 0;

}
@@ -749,13 +749,13 @@ acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data) 
		}



		if (pr->id >= 0 && (pr->id < NR_CPUS)) {

			kobject_uevent(&device->kobj, KOBJ_OFFLINE);

			kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);

			break;

		}



		result = acpi_processor_start(device);

		if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {

			kobject_uevent(&device->kobj, KOBJ_ONLINE);

			kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);

		} else {

			printk(KERN_ERR PREFIX "Device [%s] failed to start\n",

				    acpi_device_bid(device));
@@ -778,7 +778,7 @@ acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data) 
		}



		if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))

			kobject_uevent(&device->kobj, KOBJ_OFFLINE);

			kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);

		break;

	default:

		ACPI_DEBUG_PRINT((ACPI_DB_INFO,

drivers/acpi/scan.c

+41 −146
Original line number Diff line number Diff line
@@ -24,126 +24,6 @@ static LIST_HEAD(acpi_device_list); 
DEFINE_SPINLOCK(acpi_device_lock);

LIST_HEAD(acpi_wakeup_device_list);





static void acpi_device_release_legacy(struct kobject *kobj)

{

	struct acpi_device *dev = container_of(kobj, struct acpi_device, kobj);

	kfree(dev->pnp.cid_list);

	kfree(dev);

}



struct acpi_device_attribute {

	struct attribute attr;

	 ssize_t(*show) (struct acpi_device *, char *);

	 ssize_t(*store) (struct acpi_device *, const char *, size_t);

};



typedef void acpi_device_sysfs_files(struct kobject *,

				     const struct attribute *);



static void setup_sys_fs_device_files(struct acpi_device *dev,

				      acpi_device_sysfs_files * func);



#define create_sysfs_device_files(dev)	\

	setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_create_file)

#define remove_sysfs_device_files(dev)	\

	setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_remove_file)



#define to_acpi_dev(n) container_of(n, struct acpi_device, kobj)

#define to_handle_attr(n) container_of(n, struct acpi_device_attribute, attr);



static ssize_t acpi_device_attr_show(struct kobject *kobj,

				     struct attribute *attr, char *buf)

{

	struct acpi_device *device = to_acpi_dev(kobj);

	struct acpi_device_attribute *attribute = to_handle_attr(attr);

	return attribute->show ? attribute->show(device, buf) : -EIO;

}

static ssize_t acpi_device_attr_store(struct kobject *kobj,

				      struct attribute *attr, const char *buf,

				      size_t len)

{

	struct acpi_device *device = to_acpi_dev(kobj);

	struct acpi_device_attribute *attribute = to_handle_attr(attr);

	return attribute->store ? attribute->store(device, buf, len) : -EIO;

}



static struct sysfs_ops acpi_device_sysfs_ops = {

	.show = acpi_device_attr_show,

	.store = acpi_device_attr_store,

};



static struct kobj_type ktype_acpi_ns = {

	.sysfs_ops = &acpi_device_sysfs_ops,

	.release = acpi_device_release_legacy,

};



static int namespace_uevent(struct kset *kset, struct kobject *kobj,

			     char **envp, int num_envp, char *buffer,

			     int buffer_size)

{

	struct acpi_device *dev = to_acpi_dev(kobj);

	int i = 0;

	int len = 0;



	if (!dev->driver)

		return 0;



	if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len,

			   "PHYSDEVDRIVER=%s", dev->driver->name))

		return -ENOMEM;



	envp[i] = NULL;



	return 0;

}



static struct kset_uevent_ops namespace_uevent_ops = {

	.uevent = &namespace_uevent,

};



static struct kset acpi_namespace_kset = {

	.kobj = {

		 .name = "namespace",

		 },

	.subsys = &acpi_subsys,

	.ktype = &ktype_acpi_ns,

	.uevent_ops = &namespace_uevent_ops,

};



/* --------------------------------------------------------------------------

		ACPI sysfs device file support

   -------------------------------------------------------------------------- */

static ssize_t acpi_eject_store(struct acpi_device *device,

				const char *buf, size_t count);



#define ACPI_DEVICE_ATTR(_name,_mode,_show,_store) \

static struct acpi_device_attribute acpi_device_attr_##_name = \

		__ATTR(_name, _mode, _show, _store)



ACPI_DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);



/**

 * setup_sys_fs_device_files - sets up the device files under device namespace

 * @dev:	acpi_device object

 * @func:	function pointer to create or destroy the device file

 */

static void

setup_sys_fs_device_files(struct acpi_device *dev,

			  acpi_device_sysfs_files * func)

{

	acpi_status status;

	acpi_handle temp = NULL;



	/*

	 * If device has _EJ0, 'eject' file is created that is used to trigger

	 * hot-removal function from userland.

	 */

	status = acpi_get_handle(dev->handle, "_EJ0", &temp);

	if (ACPI_SUCCESS(status))

		(*(func)) (&dev->kobj, &acpi_device_attr_eject.attr);

}



static int acpi_eject_operation(acpi_handle handle, int lockable)

{

	struct acpi_object_list arg_list;
@@ -180,7 +60,8 @@ static int acpi_eject_operation(acpi_handle handle, int lockable) 
}



static ssize_t

acpi_eject_store(struct acpi_device *device, const char *buf, size_t count)

acpi_eject_store(struct device *d, struct device_attribute *attr,

		const char *buf, size_t count)

{

	int result;

	int ret = count;
@@ -188,26 +69,27 @@ acpi_eject_store(struct acpi_device *device, const char *buf, size_t count) 
	acpi_status status;

	acpi_handle handle;

	acpi_object_type type = 0;

	struct acpi_device *acpi_device = to_acpi_device(d);



	if ((!count) || (buf[0] != '1')) {

		return -EINVAL;

	}

#ifndef FORCE_EJECT

	if (device->driver == NULL) {

	if (acpi_device->driver == NULL) {

		ret = -ENODEV;

		goto err;

	}

#endif

	status = acpi_get_type(device->handle, &type);

	if (ACPI_FAILURE(status) || (!device->flags.ejectable)) {

	status = acpi_get_type(acpi_device->handle, &type);

	if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {

		ret = -ENODEV;

		goto err;

	}



	islockable = device->flags.lockable;

	handle = device->handle;

	islockable = acpi_device->flags.lockable;

	handle = acpi_device->handle;



	result = acpi_bus_trim(device, 1);

	result = acpi_bus_trim(acpi_device, 1);



	if (!result)

		result = acpi_eject_operation(handle, islockable);
@@ -219,6 +101,35 @@ acpi_eject_store(struct acpi_device *device, const char *buf, size_t count) 
	return ret;

}



static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);



static void acpi_device_setup_files(struct acpi_device *dev)

{

	acpi_status status;

	acpi_handle temp;



	/*

	 * If device has _EJ0, 'eject' file is created that is used to trigger

	 * hot-removal function from userland.

	 */

	status = acpi_get_handle(dev->handle, "_EJ0", &temp);

	if (ACPI_SUCCESS(status))

		device_create_file(&dev->dev, &dev_attr_eject);

}



static void acpi_device_remove_files(struct acpi_device *dev)

{

	acpi_status status;

	acpi_handle temp;



	/*

	 * If device has _EJ0, 'eject' file is created that is used to trigger

	 * hot-removal function from userland.

	 */

	status = acpi_get_handle(dev->handle, "_EJ0", &temp);

	if (ACPI_SUCCESS(status))

		device_remove_file(&dev->dev, &dev_attr_eject);

}

/* --------------------------------------------------------------------------

			ACPI Bus operations

   -------------------------------------------------------------------------- */
@@ -353,8 +264,6 @@ static struct bus_type acpi_bus_type = { 
static void acpi_device_register(struct acpi_device *device,

				 struct acpi_device *parent)

{

	int err;



	/*

	 * Linkage

	 * -------
@@ -375,17 +284,6 @@ static void acpi_device_register(struct acpi_device *device, 
		list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);

	spin_unlock(&acpi_device_lock);



	strlcpy(device->kobj.name, device->pnp.bus_id, KOBJ_NAME_LEN);

	if (parent)

		device->kobj.parent = &parent->kobj;

	device->kobj.ktype = &ktype_acpi_ns;

	device->kobj.kset = &acpi_namespace_kset;

	err = kobject_register(&device->kobj);

	if (err < 0)

		printk(KERN_WARNING "%s: kobject_register error: %d\n",

			__FUNCTION__, err);

	create_sysfs_device_files(device);



	if (device->parent)

		device->dev.parent = &parent->dev;

	device->dev.bus = &acpi_bus_type;
@@ -393,6 +291,8 @@ static void acpi_device_register(struct acpi_device *device, 
	sprintf(device->dev.bus_id, "%s", device->pnp.bus_id);

	device->dev.release = &acpi_device_release;

	device_add(&device->dev);



	acpi_device_setup_files(device);

}



static void acpi_device_unregister(struct acpi_device *device, int type)
@@ -409,9 +309,8 @@ static void acpi_device_unregister(struct acpi_device *device, int type) 
	spin_unlock(&acpi_device_lock);



	acpi_detach_data(device->handle, acpi_bus_data_handler);

	remove_sysfs_device_files(device);

	kobject_unregister(&device->kobj);



	acpi_device_remove_files(device);

	device_unregister(&device->dev);

}
@@ -1353,10 +1252,6 @@ static int __init acpi_scan_init(void) 
	if (acpi_disabled)

		return 0;



	result = kset_register(&acpi_namespace_kset);

	if (result < 0)

		printk(KERN_ERR PREFIX "kset_register error: %d\n", result);



	result = bus_register(&acpi_bus_type);

	if (result) {

		/* We don't want to quit even if we failed to add suspend/resume */

include/acpi/acpi_bus.h

+0 −1
Original line number Diff line number Diff line
@@ -299,7 +299,6 @@ struct acpi_device { 
	struct acpi_device_ops ops;

	struct acpi_driver *driver;

	void *driver_data;

	struct kobject kobj;

	struct device dev;

};

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