define platform wakeup hook, use in pci_enable_wake()
This defines a platform hook to enable/disable a device as a wakeup event
source. It's initially for use with ACPI, but more generally it could be used
whenever enable_irq_wake()/disable_irq_wake() don't suffice.
The hook is called -- if available -- inside pci_enable_wake(); and the
semantics of that call are enhanced so that support for PCI PME# is no longer
needed. It can now work for devices with "legacy PCI PM", when platform
support allows it. (That support would use some board-specific signal for for
the same purpose as PME#.)
[akpm@linux-foundation.org: Make it compile with CONFIG_PM=n]
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Cc: Len Brown <lenb@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/include/linux/pm.h b/include/linux/pm.h
index 21db05a..b0ab623 100644
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -273,6 +273,20 @@
__suspend_report_result(__FUNCTION__, fn, ret); \
} while (0)
+/*
+ * Platform hook to activate device wakeup capability, if that's not already
+ * handled by enable_irq_wake() etc.
+ * Returns zero on success, else negative errno
+ */
+extern int (*platform_enable_wakeup)(struct device *dev, int is_on);
+
+static inline int call_platform_enable_wakeup(struct device *dev, int is_on)
+{
+ if (platform_enable_wakeup)
+ return (*platform_enable_wakeup)(dev, is_on);
+ return 0;
+}
+
#else /* !CONFIG_PM */
static inline int device_suspend(pm_message_t state)
@@ -294,6 +308,11 @@
#define suspend_report_result(fn, ret) do { } while (0)
+static inline int call_platform_enable_wakeup(struct device *dev, int is_on)
+{
+ return -EIO;
+}
+
#endif
/* changes to device_may_wakeup take effect on the next pm state change.