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Subject[PATCH 3/7] Documentation/gpio.txt: explain poll/select usage
From: Bernhard Walle <walle@corscience.de>

Add a bit more information how to use poll(2) on GPIO value files
correctly. For me it was not clear that I need to poll(2) for
POLLPRI|POLLERR or select(2) for exceptfds.

Signed-off-by: Bernhard Walle <walle@corscience.de>
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
---
Documentation/gpio.txt | 10 ++++++++++
1 file changed, 10 insertions(+)

--- linux-2.6.37-rc2-git4.orig/Documentation/gpio.txt
+++ linux-2.6.37-rc2-git4/Documentation/gpio.txt
@@ -617,6 +617,16 @@ and have the following read/write attrib
is configured as an output, this value may be written;
any nonzero value is treated as high.

+ If the pin can be configured as interrupt-generating interrupt
+ and if it has been configured to generate interrupts (see the
+ description of "edge"), you can poll(2) on that file and
+ poll(2) will return whenever the interrupt was triggered. If
+ you use poll(2), set the events POLLPRI and POLLERR. If you
+ use select(2), set the file descriptor in exceptfds. After
+ poll(2) returns, either lseek(2) to the beginning of the sysfs
+ file and read the new value or close the file and re-open it
+ to read the value.
+
"edge" ... reads as either "none", "rising", "falling", or
"both". Write these strings to select the signal edge(s)
that will make poll(2) on the "value" file return.

--



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