Commit c4168bff authored by Li Shaohua's avatar Li Shaohua Committed by Len Brown
Browse files

ACPI: add acpi_bus_ops in acpi_device 



Add acpi_bus_ops in acpi_device to support acpi hot plug.

NOTE:	Two methods .add and .start in acpi_driver.ops are
	called separately to probe ACPI devices, while only
	.probe method is called in driver model.
	As executing .add and .start separately is critical
	for ACPI device hot plug, we use acpi_bus_ops to
	distinguish different code path.

Signed-off-by: default avatarZhang Rui <rui.zhang@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent f883d9db

drivers/acpi/scan.c

+28 −27
Original line number Diff line number Diff line
@@ -212,6 +212,7 @@ static int acpi_device_probe(struct device * dev) 


	ret = acpi_bus_driver_init(acpi_dev, acpi_drv);

	if (!ret) {

		if (acpi_dev->bus_ops.acpi_op_start)

			acpi_start_single_object(acpi_dev);

		ACPI_DEBUG_PRINT((ACPI_DB_INFO,

			"Found driver [%s] for device [%s]\n",
@@ -305,7 +306,6 @@ static void acpi_device_unregister(struct acpi_device *device, int type) 
		list_del(&device->g_list);



	list_del(&device->wakeup_list);



	spin_unlock(&acpi_device_lock);



	acpi_detach_data(device->handle, acpi_bus_data_handler);
@@ -876,7 +876,8 @@ static int acpi_bus_remove(struct acpi_device *dev, int rmdevice) 


static int

acpi_add_single_object(struct acpi_device **child,

		       struct acpi_device *parent, acpi_handle handle, int type)

		       struct acpi_device *parent, acpi_handle handle, int type,

			struct acpi_bus_ops *ops)

{

	int result = 0;

	struct acpi_device *device = NULL;
@@ -894,6 +895,8 @@ acpi_add_single_object(struct acpi_device **child, 


	device->handle = handle;

	device->parent = parent;

	device->bus_ops = *ops; /* workround for not call .start */





	acpi_device_get_busid(device, handle, type);
@@ -1079,14 +1082,14 @@ static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops) 


		if (ops->acpi_op_add)

			status = acpi_add_single_object(&child, parent,

							chandle, type);

				chandle, type, ops);

		else

			status = acpi_bus_get_device(chandle, &child);



		if (ACPI_FAILURE(status))

			continue;



		if (ops->acpi_op_start) {

		if (ops->acpi_op_start && !(ops->acpi_op_add)) {

			status = acpi_start_single_object(child);

			if (ACPI_FAILURE(status))

				continue;
@@ -1124,13 +1127,13 @@ acpi_bus_add(struct acpi_device **child, 
	int result;

	struct acpi_bus_ops ops;





	result = acpi_add_single_object(child, parent, handle, type);

	if (!result) {

	memset(&ops, 0, sizeof(ops));

	ops.acpi_op_add = 1;



	result = acpi_add_single_object(child, parent, handle, type, &ops);

	if (!result)

		result = acpi_bus_scan(*child, &ops);

	}



	return result;

}
@@ -1216,28 +1219,30 @@ static int acpi_bus_scan_fixed(struct acpi_device *root) 
{

	int result = 0;

	struct acpi_device *device = NULL;



	struct acpi_bus_ops ops;



	if (!root)

		return -ENODEV;



	memset(&ops, 0, sizeof(ops));

	ops.acpi_op_add = 1;

	ops.acpi_op_start = 1;



	/*

	 * Enumerate all fixed-feature devices.

	 */

	if (acpi_fadt.pwr_button == 0) {

		result = acpi_add_single_object(&device, acpi_root,

						NULL,

						ACPI_BUS_TYPE_POWER_BUTTON);

		if (!result)

			result = acpi_start_single_object(device);

						ACPI_BUS_TYPE_POWER_BUTTON,

						&ops);

	}



	if (acpi_fadt.sleep_button == 0) {

		result = acpi_add_single_object(&device, acpi_root,

						NULL,

						ACPI_BUS_TYPE_SLEEP_BUTTON);

		if (!result)

			result = acpi_start_single_object(device);

						ACPI_BUS_TYPE_SLEEP_BUTTON,

						&ops);

	}



	return result;
@@ -1252,6 +1257,10 @@ static int __init acpi_scan_init(void) 
	if (acpi_disabled)

		return 0;



	memset(&ops, 0, sizeof(ops));

	ops.acpi_op_add = 1;

	ops.acpi_op_start = 1;



	result = bus_register(&acpi_bus_type);

	if (result) {

		/* We don't want to quit even if we failed to add suspend/resume */
@@ -1262,11 +1271,7 @@ static int __init acpi_scan_init(void) 
	 * Create the root device in the bus's device tree

	 */

	result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,

					ACPI_BUS_TYPE_SYSTEM);

	if (result)

		goto Done;



	result = acpi_start_single_object(acpi_root);

					ACPI_BUS_TYPE_SYSTEM, &ops);

	if (result)

		goto Done;
@@ -1274,12 +1279,8 @@ static int __init acpi_scan_init(void) 
	 * Enumerate devices in the ACPI namespace.

	 */

	result = acpi_bus_scan_fixed(acpi_root);

	if (!result) {

		memset(&ops, 0, sizeof(ops));

		ops.acpi_op_add = 1;

		ops.acpi_op_start = 1;

	if (!result)

		result = acpi_bus_scan(acpi_root, &ops);

	}



	if (result)

		acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);

include/acpi/acpi_bus.h

+1 −0
Original line number Diff line number Diff line
@@ -300,6 +300,7 @@ struct acpi_device { 
	struct acpi_driver *driver;

	void *driver_data;

	struct device dev;

	struct acpi_bus_ops bus_ops;	/* workaround for different code path for hotplug */

};



#define acpi_driver_data(d)	((d)->driver_data)

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