diff options
author | Takashi Iwai <tiwai@suse.de> | 2010-12-13 09:29:52 +0100 |
---|---|---|
committer | Takashi Iwai <tiwai@suse.de> | 2010-12-13 09:29:52 +0100 |
commit | 354d14b3f53cc749c5d26d4ba7280d1e931d6bc4 (patch) | |
tree | 59b597e44902d8db8bde7deac1e7e707327c6fe6 /Documentation/gpio.txt | |
parent | 5144c534d16529bc469396211131e8935589f833 (diff) | |
parent | 5b84ba26a9672e615897234fa5efd3eea2d6b295 (diff) | |
download | talos-op-linux-354d14b3f53cc749c5d26d4ba7280d1e931d6bc4.tar.gz talos-op-linux-354d14b3f53cc749c5d26d4ba7280d1e931d6bc4.zip |
Merge branch 'topic/workq-update' into topic/misc
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. |