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| author | H Hartley Sweeten <hartleys@visionengravers.com> | 2013-06-11 21:38:59 +0400 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@gmail.com> | 2013-06-21 13:32:51 +0400 |
| commit | 76abbdde2d95a3807d0dc6bf9f84d03d0dbd4f3d (patch) | |
| tree | 63a5476d6fbf80ec90b813461ec7ec67ff462684 /Documentation/sparse.txt | |
| parent | 3dd0a909479c1d372341d749b4ff94cd638b57da (diff) | |
| download | linux-76abbdde2d95a3807d0dc6bf9f84d03d0dbd4f3d.tar.xz | |
pwm: Add sysfs interface
Add a simple sysfs interface to the generic PWM framework.
/sys/class/pwm/
`-- pwmchipN/ for each PWM chip
|-- export (w/o) ask the kernel to export a PWM channel
|-- npwm (r/o) number of PWM channels in this PWM chip
|-- pwmX/ for each exported PWM channel
| |-- duty_cycle (r/w) duty cycle (in nanoseconds)
| |-- enable (r/w) enable/disable PWM
| |-- period (r/w) period (in nanoseconds)
| `-- polarity (r/w) polarity of PWM (normal/inversed)
`-- unexport (w/o) return a PWM channel to the kernel
Based on work by Lars Poeschel.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Lars Poeschel <poeschel@lemonage.de>
Cc: Ryan Mallon <rmallon@gmail.com>
Cc: Rob Landley <rob@landley.net>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'Documentation/sparse.txt')
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