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author | Paul Mundt <lethal@linux-sh.org> | 2010-12-22 12:56:10 +0900 |
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committer | Paul Mundt <lethal@linux-sh.org> | 2010-12-22 12:56:10 +0900 |
commit | 7ccbefe07ea0a3570e44d1ec13a307552ee4dadd (patch) | |
tree | ba0299694a9f3940f289b6a29cadab853906e3d2 /Documentation/gpio.txt | |
parent | 623eb15647fc35c5a8cd38985d5958240eb072c1 (diff) | |
parent | 90a8a73c06cc32b609a880d48449d7083327e11a (diff) | |
download | linux-7ccbefe07ea0a3570e44d1ec13a307552ee4dadd.tar.gz |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
Diffstat (limited to 'Documentation/gpio.txt')
-rw-r--r-- | Documentation/gpio.txt | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/gpio.txt b/Documentation/gpio.txt index 9633da01ff46..792faa3c06cf 100644 --- a/Documentation/gpio.txt +++ b/Documentation/gpio.txt @@ -617,6 +617,16 @@ and have the following read/write attributes: 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. |