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author | Simon Horman <horms@verge.net.au> | 2011-01-13 10:29:21 +0900 |
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committer | Simon Horman <horms@verge.net.au> | 2011-01-13 10:29:21 +0900 |
commit | fee1cc0895fd7bde875a86bbc3a1e82089e540b8 (patch) | |
tree | df0a07a650229fd7aa775ca6c20a8d2939c96e72 /Documentation/gpio.txt | |
parent | netfilter: fix compilation when conntrack is disabled but tproxy is enabled (diff) | |
parent | Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/hch/hfsplus (diff) | |
download | linux-dev-fee1cc0895fd7bde875a86bbc3a1e82089e540b8.tar.xz linux-dev-fee1cc0895fd7bde875a86bbc3a1e82089e540b8.zip |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 into HEAD
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. |