1 What: /sys/class/gpio/
2 Date: July 2008
3 KernelVersion: 2.6.27
4 Contact: Linus Walleij <linusw@kernel.or
5 Description:
6
7 As a Kconfig option, individual GPIO signals
8 userspace. GPIOs are only made available to
9 "export" operation. If a given GPIO is not
10 kernel code, it may be exported by userspace
11 Kernel code may export it for complete or pa
12
13 GPIOs are identified as they are inside the
14 the range 0..INT_MAX. See Documentation/adm
15
16 ::
17
18 /sys/class/gpio
19 /export ... asks the kernel to export
20 /unexport ... to return a GPIO to the
21 /gpioN ... for each exported GPIO #N O
22 /<LINE-NAME> ... for a properly named
23 /value ... always readable, writes
24 /direction ... r/w as: in, out (de
25 /edge ... r/w as: none, falling, r
26 /gpiochipN ... for each gpiochip; #N i
27 /base ... (r/o) same as N
28 /label ... (r/o) descriptive, not
29 /ngpio ... (r/o) number of GPIOs;
30
31 This ABI is obsoleted by Documentation/ABI/t
32 removed after 2020.
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