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If the chip can have an LED, register a struct led_classdev and enable hardware-controlled blinking. When the chip is not transmitting or receiving anything the LED is off. Otherwise the LED will blink faster or slower according to the throughput. The LED can be controlled from userspace by writing 0, 1, or 2 to /sys/class/leds/rtl8xxxu-usbX-Y/brightness: 0 - solid off. 1 - solid on. 2 - hardware-controlled blinking. In this patch none of the chips advertise having an LED. That will be added in the next patches. Signed-off-by: Bitterblue Smith <rtl8821cerfe2@gmail.com> Reviewed-by: Ping-Ke Shih <pkshih@realtek.com> Signed-off-by: Kalle Valo <kvalo@kernel.org> Link: https://lore.kernel.org/r/b8235bca-60c3-d0fe-a958-53c6dd3ba3f6@gmail.com
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.