Subject: [PATCH] [acpi driver model] Define helpers for empty methods

- Declare macros for helping define methods that drivers
  do not implement:

	- acpi_no_start(name)
	- acpi_no_stop(name)
	- acpi_no_shutdown(name)
	- acpi_no_suspend(name)
	- acpi_no_resume(name)

  A driver can use these, instead of doing:

  static int foo_start(struct acpi_dev * dev)
  {
	return 0;
  }

  (though the two are equivalent)

Signed-off-by: Patrick Mochel <mochel@linux.intel.com>

---

 include/acpi/driver.h |   36 ++++++++++++++++++++++++++++++++++++
 1 files changed, 36 insertions(+), 0 deletions(-)

applies-to: 66aa28839da93645c8976b4e6944ec8b7b51d0be
42feb84952604922384116771c61b413e5847c9a
diff --git a/include/acpi/driver.h b/include/acpi/driver.h
index e7d3312..29c0cc4 100644
--- a/include/acpi/driver.h
+++ b/include/acpi/driver.h
@@ -28,6 +28,42 @@ extern int acpi_driver_register(struct a
 extern void acpi_driver_unregister(struct acpi_device_driver *);
 
 
+/**
+ *	A driver can use these macros for declaring empty
+ *	methods (that must be present for the driver to 
+ *	initialize properly); or when developing a driver
+ *	before all of the methods get filled in.
+ *
+ *	To replace one of the methods with real code, use e.g.
+ *
+ *	static int ac_start(struct acpi_dev * ad)
+ *	{
+ *		return 0;
+ *	}
+ *
+ *	...and go from there.
+ */
+
+#define acpi_no_start(__name)	\
+static int __name##_start(struct acpi_dev * ad) { return 0; }
+
+
+#define acpi_no_stop(__name)	\
+static int __name##_stop(struct acpi_dev * ad) { return 0; }
+
+
+#define acpi_no_shutdown(__name)	\
+static void __name##_shutdown(struct acpi_dev * ad) { }
+
+
+#define acpi_no_suspend(__name)	\
+static int __name##_suspend(struct acpi_dev * ad, u32 state) { return 0; }
+
+
+#define acpi_no_resume(__name)	\
+static int __name##_resume(struct acpi_dev * ad) { return 0; }
+
+
 
 #define __decl_acpi_ids(__name, ...) \
 	static const char * __name##_ids[] = { __VA_ARGS__ }
---
0.99.9.GIT