user/sven/linux.git/include/linux/leds.h, branch v6.1.96

leds: trigger: use RCU to protect the led_cdevs list

2021-09-27T14:16:42Z

Even with the previous commit 27af8e2c90fb ("leds: trigger: fix potential deadlock with libata") to this file, we still get lockdep unhappy, and Boqun explained the report here: https://lore.kernel.org/r/YNA+d1X4UkoQ7g8a@boqun-archlinux Effectively, this means that the read_lock_irqsave() isn't enough here because another CPU might be trying to do a write lock, and thus block the readers. This is all pretty messy, but it doesn't seem right that the LEDs framework imposes some locking requirements on users, in particular we'd have to make the spinlock in the iwlwifi driver always disable IRQs, even if we don't need that for any other reason, just to avoid this deadlock. Since writes to the led_cdevs list are rare (and are done by userspace), just switch the list to RCU. This costs a synchronize_rcu() at removal time so we can ensure things are correct, but that seems like a small price to pay for getting lock-free iterations and no deadlocks (nor any locking requirements imposed on users.) Signed-off-by: Johannes Berg Signed-off-by: Pavel Machek

leds: move default_state read from fwnode to core

2021-08-18T06:27:30Z

This patch introduces a new function to read initial default_state from fwnode. Suggested-by: Pavel Machek Signed-off-by: Denis Osterland-Heim Signed-off-by: Pavel Machek

leds: led-core: Get rid of enum led_brightness

2021-02-19T10:35:28Z

This gets rid of enum led_brightness in the main led files, because it is deprecated, and an unsigned int can be used instead. We can get rid of led_brightness completely and patches can also be supplied for the other drivers' files. Signed-off-by: Abanoub Sameh Signed-off-by: Pavel Machek

leds: trigger: add support for LED-private device triggers

2020-07-22T12:42:07Z

Some LED controllers may come with an internal HW triggering mechanism for the LED and the ability to switch between SW control and the internal HW control. This includes most PHYs, various ethernet switches, the Turris Omnia LED controller or AXP20X PMIC. This adds support for registering such triggers. This code is based on work by Pavel Machek and Ondřej Jirman . Signed-off-by: Marek Behún Acked-by: Jacek Anaszewski Signed-off-by: Pavel Machek

leds: old enums are not really applicable to new code

2020-04-06T20:55:27Z

Warn about old defines that probably should not be used. Signed-off-by: Pavel Machek

leds: Add managed API to get a LED from a device driver

2020-01-05T23:20:18Z

If the LED is acquired by a consumer device with devm_led_get(), it is automatically released when the device is detached. Signed-off-by: Jean-Jacques Hiblot Acked-by: Pavel Machek Signed-off-by: Pavel Machek

leds: Add of_led_get() and led_put()

2020-01-05T23:20:06Z

This patch adds basic support for a kernel driver to get a LED device. This will be used by the led-backlight driver. Only OF version is implemented for now, and the behavior is similar to PWM's of_pwm_get() and pwm_put(). Signed-off-by: Tomi Valkeinen Signed-off-by: Jean-Jacques Hiblot Acked-by: Pavel Machek Signed-off-by: Pavel Machek

leds: core: Fix leds.h structure documentation

2019-11-03T16:38:55Z

Update the leds.h structure documentation to define the correct arguments. Signed-off-by: Dan Murphy Signed-off-by: Pavel Machek

leds: core: Remove extern from header

2019-11-03T16:38:46Z

extern is implied and is not needed in the header file. Remove the extern keyword and re-align the code. Signed-off-by: Dan Murphy Signed-off-by: Pavel Machek

leds: remove PAGE_SIZE limit of /sys/class/leds//trigger

2019-11-03T16:38:14Z

Reading /sys/class/leds//trigger returns all available LED triggers. However, the size of this file is limited to PAGE_SIZE because of the limitation for sysfs attribute. Enabling LED CPU trigger on systems with thousands of CPUs easily hits PAGE_SIZE limit, and makes it impossible to see all available LED triggers and which trigger is currently activated. We work around it here by converting /sys/class/leds//trigger to binary attribute, which is not limited by length. This is _not_ good design, do not copy it. Signed-off-by: Akinobu Mita Cc: "Rafael J. Wysocki" Cc: Pavel Machek Cc: Dan Murphy A Reviewed-by: Greg Kroah-Hartman Signed-off-by: Pavel Machek