kernel/git/stable/linux.git/drivers/pwm/sysfs.c, branch linux-3.18.yLinux kernel stable treehttps://git.rulkc.org/pub/scm/linux/kernel/git/stable/linux.git/atom?h=linux-3.18.y2017-04-18T05:55:45+00:00pwm: Unexport children before chip removal2017-04-18T05:55:45+00:00David Hsudavidhsu@google.com2016-08-09T21:57:46+00:00urn:sha1:645545fee15cbab94ebf020278b9426620c2fe2e
commit 0733424c9ba9f42242409d1ece780777272f7ea1 upstream.
Exported pwm channels aren't removed before the pwmchip and are
leaked. This results in invalid sysfs files. This fix removes
all exported pwm channels before chip removal.
Signed-off-by: David Hsu <davidhsu@google.com>
Fixes: 76abbdde2d95 ("pwm: Add sysfs interface")
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pwm: sysfs: Convert to use ATTRIBUTE_GROUPS macro2013-12-04T10:35:28+00:00Axel Linaxel.lin@ingics.com2013-12-04T10:29:53+00:00urn:sha1:6ca142ad0d1bdf8dd116351b7b9a2bc5670d5271
Use new ATTRIBUTE_GROUPS macro to reduce the number of lines of code.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
pwm: convert class code to use dev_groups2013-07-29T07:08:33+00:00Greg Kroah-Hartmangregkh@linuxfoundation.org2013-07-24T22:05:39+00:00urn:sha1:9da01759636f519967c0922ae12bd9fff739db9a
The dev_attrs field of struct class is going away soon, dev_groups
should be used instead. This converts the PWM class code to use the
correct field.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
pwm: Add sysfs interface2013-06-21T09:32:51+00:00H Hartley Sweetenhartleys@visionengravers.com2013-06-11T17:38:59+00:00urn:sha1:76abbdde2d95a3807d0dc6bf9f84d03d0dbd4f3d
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>