driver-api/gpio/drivers-on-gpio.rst

6 the right in-kernel and userspace APIs/ABIs for the job, and that these
10 - leds-gpio: drivers/leds/leds-gpio.c will handle LEDs connected to  GPIO
13 - ledtrig-gpio: drivers/leds/trigger/ledtrig-gpio.c will provide a LED trigger,
15   (and that LED may in turn use the leds-gpio as per above).
17 - gpio-keys: drivers/input/keyboard/gpio_keys.c is used when your GPIO line
20 - gpio-keys-polled: drivers/input/keyboard/gpio_keys_polled.c is used when your
24 - gpio_mouse: drivers/input/mouse/gpio_mouse.c is used to provide a mouse with
29 - gpio-beeper: drivers/input/misc/gpio-beeper.c is used to provide a beep from
32 - extcon-gpio: drivers/extcon/extcon-gpio.c is used when you need to read an
36 - restart-gpio: drivers/power/reset/gpio-restart.c is used to restart/reboot
37   the system by pulling a GPIO line and will register a restart handler so
38   userspace can issue the right system call to restart the system.
40 - poweroff-gpio: drivers/power/reset/gpio-poweroff.c is used to power the
41   system down by pulling a GPIO line and will register a pm_power_off()
42   callback so that userspace can issue the right system call to power down the
43   system.
45 - gpio-gate-clock: drivers/clk/clk-gpio.c is used to control a gated clock
48 - i2c-gpio: drivers/i2c/busses/i2c-gpio.c is used to drive an I2C bus
50   appear as any other I2C bus to the system and makes it possible to connect
51   drivers for the I2C devices on the bus like any other I2C bus driver.
53 - spi_gpio: drivers/spi/spi-gpio.c is used to drive an SPI bus (variable number
55   GPIO hammering (bitbang). It will appear as any other SPI bus on the system
56   and makes it possible to connect drivers for SPI devices on the bus like
57   any other SPI bus driver. For example any MMC/SD card can then be connected
60 - w1-gpio: drivers/w1/masters/w1-gpio.c is used to drive a one-wire bus using
62   the bus like any other W1 device.
64 - gpio-fan: drivers/hwmon/gpio-fan.c is used to control a fan for cooling the
65   system, connected to a GPIO line (and optionally a GPIO alarm line),
66   presenting all the right in-kernel and sysfs interfaces to make your system
69 - gpio-regulator: drivers/regulator/gpio-regulator.c is used to control a
73 - gpio-wdt: drivers/watchdog/gpio_wdt.c is used to provide a watchdog timer
75   it from 1-to-0-to-1. If that hardware does not receive its "ping"
76   periodically, it will reset the system.
78 - gpio-nand: drivers/mtd/nand/raw/gpio.c is used to connect a NAND flash chip
83 - ps2-gpio: drivers/input/serio/ps2-gpio.c is used to drive a PS/2 (IBM) serio
84   bus, data and clock line, by bit banging two GPIO lines. It will appear as
85   any other serio bus to the system and makes it possible to connect drivers
88 - cec-gpio: drivers/media/platform/cec-gpio/ is used to interact with a CEC
89   Consumer Electronics Control bus using only GPIO. It is used to communicate
90   with devices on the HDMI bus.
92 - gpio-charger: drivers/power/supply/gpio-charger.c is used if you need to do
99 - gpio-mux: drivers/mux/gpio.c is used for controlling a multiplexer using
102   some SoC-external entities, such as different components on a PCB that
108 MTD NOR flash has add-ons for extra GPIO lines too, though the address bus is
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