• Nicolin Chen's avatar
    hwmon: (core) Add trace events to _attr_show/store functions · 61b8ab2c
    Nicolin Chen authored
    Trace events are useful for people who collect data from the
    Ftrace outputs. There're people who analyse the relationship
    of cpufreq, thermal and hwmon (power/voltage/current) using
    the convenient and timestamped Ftrace outputs, while unlike
    cpufreq and thermal subsystems the hwmon does not have trace
    events supported yet.
    
    So this patch adds initial trace events for the hwmon core.
    To call hwmon_attr_base() for aligned attr index numbers, it
    also moves the function upward.
    
    Ftrace outputs:
     ...: hwmon_attr_show_string: index=2, attr_name=in2_label, val=VDD_5V
     ...: hwmon_attr_show: index=2, attr_name=in2_input, val=5112
     ...: hwmon_attr_show: index=2, attr_name=curr2_input, val=440
    
    Note that the _attr_show and _attr_store functions are tied
    to the _with_info API. So a hwmon driver requiring the trace
    events feature should use _with_info API to register a hwmon
    device.
    Signed-off-by: default avatarNicolin Chen <nicoleotsuka@gmail.com>
    Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
    61b8ab2c
hwmon.h 1.45 KB