firmware-utiles: add *.attr for GPIO symbolic links To recognize the polarity of each GPIO, we need to expose the information from chromeos_acpi interface. BUG=chrome-os-partner:1940 TEST=(on mario, BIOS ver = G5) gpio_setup; cd /home/gpio; ls -l # complete output: (output_header[1-7] is stripped) # debug_header_0 -> /sys/class/gpio/gpio201/value # debug_header_0.attr -> /sys/bus/platform/devices/chromeos_acpi/GPIO.3/GPIO.1 # developer_switch -> /sys/class/gpio/gpio193/value # developer_switch.attr -> /sys/bus/platform/devices/chromeos_acpi/GPIO.1/GPIO.1 # recovery_button -> /sys/class/gpio/gpio230/value # recovery_button.attr -> /sys/bus/platform/devices/chromeos_acpi/GPIO.0/GPIO.1 # write_protect -> /sys/class/gpio/gpio226/value # write_protect.attr -> /sys/bus/platform/devices/chromeos_acpi/GPIO.2/GPIO.1 for X in *.attr; do echo $X - $(cat $X); done # debug_header_0.attr - 0 # developer_switch.attr - 1 # recovery_button.attr - 0 # write_protect.attr - 0 (this should be 1 in new BIOS) Change-Id: Ib42b4662c4369112a8f4fb69989d62f2d1b76590 Review URL: http://codereview.chromium.org/6324005
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