kernel/linux.git/drivers/pwm/sysfs.c, branch linux-4.16.y

pwm: Set class for exported channels in sysfs

2017-12-05T08:24:58+00:00

Notifications for devices without bus or class set get dropped by dev_uevent_filter(). Adding the class to the exported child matches what the GPIO subsystem is doing. With this change exporting a channel triggers a udev event, which gives userspace a chance to fixup permissions and makes it possible for non-root users to make use of the PWM subsystem. Signed-off-by: Gottfried Haider CC: Thierry Reding CC: H Hartley Sweeten CC: linux-pwm@vger.kernel.org CC: linux-arm-kernel@lists.infradead.org CC: linux-rpi-kernel@lists.infradead.org Signed-off-by: Thierry Reding

pwm: Fix device reference leak

2016-11-29T15:43:24+00:00

Make sure to drop the reference to the parent device taken by class_find_device() after "unexporting" any children when deregistering a PWM chip. Fixes: 0733424c9ba9 ("pwm: Unexport children before chip removal") Signed-off-by: Johan Hovold Signed-off-by: Thierry Reding

pwm: Unexport children before chip removal

2016-09-05T14:45:39+00:00

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 Fixes: 76abbdde2d95 ("pwm: Add sysfs interface") Signed-off-by: Thierry Reding

Merge branch 'for-4.8/capture' into for-next

2016-07-25T14:23:39+00:00

pwm: sysfs: Add PWM capture support

2016-06-10T14:01:40+00:00

Allow a user to read PWM capture results from sysfs. To start a capture and read the result, simply read the file: $ cat $PWMCHIP/capture The output format is " ". Signed-off-by: Lee Jones Signed-off-by: Thierry Reding

pwm: sysfs: Get return value from pwm_apply_state()

2016-06-10T12:24:40+00:00

This patch adds to check the return value from pwm_apply_state() used in enable_store(). The error of enable_store() doesn't work if the return value doesn't received. Signed-off-by: Ryo Kodama Signed-off-by: Yoshihiro Shimoda Fixes: 39100ceea79f ("pwm: Switch to the atomic API") Signed-off-by: Thierry Reding

pwm: Switch to the atomic API

2016-05-17T12:48:04+00:00

Replace legacy pwm_get/set_xxx() and pwm_config/enable/disable() calls by pwm_get/apply_state(). Signed-off-by: Boris Brezillon Signed-off-by: Thierry Reding

pwm: Get rid of pwm->lock

2016-05-17T12:44:59+00:00

PWM devices are not protected against concurrent accesses. The lock in struct pwm_device might let PWM users think it is, but it's actually only protecting the enabled state. Removing this lock should be fine as long as all PWM users are aware that accesses to the PWM device have to be serialized, which seems to be the case for all of them except the sysfs interface. Patch the sysfs code by adding a lock to the pwm_export struct and making sure it's taken for all relevant accesses to the exported PWM device. Signed-off-by: Boris Brezillon Signed-off-by: Thierry Reding

pwm: sysfs: Make use of the DEVICE_ATTR_[RW][WO] macro's

2015-11-10T12:06:46+00:00

For the npwm property the PWM sysfs interface already made use of the DEVICE_ATTR_RO macro. This patch expands this to the other sysfs properties so that the code base is concise and makes use of this helpful macro. This has the advantage of slightly reducing the code size, improving readability and no longer using magic values for permissions. Signed-off-by: Olliver Schinagl Signed-off-by: Thierry Reding

pwm: sysfs: Remove unnecessary temporary variable

2015-11-10T12:06:45+00:00

Use the result of pwm_is_enabled() directly instead of storing it in a temporary variable. Signed-off-by: Olliver Schinagl Signed-off-by: Thierry Reding