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
25   up to three buttons by simply using GPIOs and no mouse port. You can cut the
26   mouse cable and connect the wires to GPIO lines or solder a mouse connector
29 - gpio-beeper: drivers/input/misc/gpio-beeper.c is used to provide a beep from
31   off/on, for an actual PWM waveform, see pwm-gpio below.)
33 - pwm-gpio: drivers/pwm/pwm-gpio.c is used to toggle a GPIO with a high
37 - extcon-gpio: drivers/extcon/extcon-gpio.c is used when you need to read an
41 - restart-gpio: drivers/power/reset/gpio-restart.c is used to restart/reboot
45 - poweroff-gpio: drivers/power/reset/gpio-poweroff.c is used to power the
50 - gpio-gate-clock: drivers/clk/clk-gpio.c is used to control a gated clock
53 - i2c-gpio: drivers/i2c/busses/i2c-gpio.c is used to drive an I2C bus
55   appear as any other I2C bus to the system and makes it possible to connect
58 - spi_gpio: drivers/spi/spi-gpio.c is used to drive an SPI bus (variable number
61   and makes it possible to connect drivers for SPI devices on the bus like
65 - w1-gpio: drivers/w1/masters/w1-gpio.c is used to drive a one-wire bus using
69 - gpio-fan: drivers/hwmon/gpio-fan.c is used to control a fan for cooling the
71   presenting all the right in-kernel and sysfs interfaces to make your system
74 - gpio-regulator: drivers/regulator/gpio-regulator.c is used to control a
78 - gpio-wdt: drivers/watchdog/gpio_wdt.c is used to provide a watchdog timer
80   it from 1-to-0-to-1. If that hardware does not receive its "ping"
83 - gpio-nand: drivers/mtd/nand/raw/gpio.c is used to connect a NAND flash chip
88 - ps2-gpio: drivers/input/serio/ps2-gpio.c is used to drive a PS/2 (IBM) serio
90   any other serio bus to the system and makes it possible to connect drivers
93 - cec-gpio: drivers/media/platform/cec-gpio/ is used to interact with a CEC
97 - gpio-charger: drivers/power/supply/gpio-charger.c is used if you need to do
104 - gpio-mux: drivers/mux/gpio.c is used for controlling a multiplexer using
106   different GPIO lines. Often the GPIOs are on a SoC and the devices are
107   some SoC-external entities, such as different components on a PCB that
113 MTD NOR flash has add-ons for extra GPIO lines too, though the address bus is
116 Use those instead of talking directly to the GPIOs from userspace; they
119 speed up your embedded hacking in particular by providing ready-made components.