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我正在使用 iMX6Q SD 板。而且我必须访问背光驱动程序来控制背光对比度。如何从用户空间或内核空间访问?(背光PWM驱动路径为drivers/video/backlight/pwm_bl.c)。提前致谢。
drivers/video/backlight/pwm_bl.c
sysfs 是 misc 驱动程序的接口。