On 22 March 2017 at 09:42, Linus Walleij <linus.walleij@xxxxxxxxxx> wrote: > Nice! Have you tested my new GPIO character device tools from > tools/gpio/* in the kernel tree? I had not and thanks for pointing that out, lsgpio lists all available gpios (though most of them are unnamed), and gpio-hammer successfully toggled buzzer on/off. uname -a Linux zurkon 4.11.0-rc1-next-20170310-00004-gc63f3c2 #4466 PREEMPT Wed Mar 22 11:05:28 CET 2017 armv4l GNU/Linux ./lsgpio GPIO chip: gpiochip0, "FTGPIO010", 32 GPIO lines line 0: unnamed unused [output] line 1: unnamed unused [output] line 2: unnamed unused [output] line 3: unnamed unused [output] line 4: unnamed unused line 5: unnamed "rtc_sclk" [kernel output] line 6: unnamed "rtc_data" [kernel] line 7: unnamed "rtc_reset" [kernel output] line 8: unnamed unused line 9: unnamed unused line 10: unnamed unused line 11: unnamed unused [output] line 12: unnamed unused line 13: unnamed unused [output] line 14: unnamed unused line 15: unnamed unused [output] line 16: unnamed unused line 17: unnamed unused [output] line 18: unnamed unused line 19: unnamed unused line 20: unnamed unused line 21: unnamed unused line 22: unnamed unused line 23: unnamed unused line 24: unnamed unused [output] line 25: unnamed unused line 26: unnamed unused line 27: unnamed "ready-led" [kernel output active-low] line 28: unnamed unused line 29: unnamed unused line 30: unnamed unused line 31: unnamed unused [output] ./gpio-hammer -n gpiochip0 -o 24 Hammer lines [24] on gpiochip0, initial states: [0] [|] [24: 1] ./gpio-hammer -n gpiochip0 -o 27 Failed to issue GET LINEHANDLE IOCTL (-16) Jonas -- To unsubscribe from this list: send the line "unsubscribe linux-gpio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html