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
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
42   the system by pulling a GPIO line and will register a restart handler so
43   userspace can issue the right system call to restart the system.
45 - poweroff-gpio: drivers/power/reset/gpio-poweroff.c is used to power the
46   system down by pulling a GPIO line and will register a pm_power_off()
47   callback so that userspace can issue the right system call to power down the
48   system.
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
56   drivers for the I2C devices on the bus like any other I2C bus driver.
58 - spi_gpio: drivers/spi/spi-gpio.c is used to drive an SPI bus (variable number
60   GPIO hammering (bitbang). It will appear as any other SPI bus on the system
61   and makes it possible to connect drivers for SPI devices on the bus like
62   any other SPI bus driver. For example any MMC/SD card can then be connected
65 - w1-gpio: drivers/w1/masters/w1-gpio.c is used to drive a one-wire bus using
67   the bus like any other W1 device.
69 - gpio-fan: drivers/hwmon/gpio-fan.c is used to control a fan for cooling the
70   system, connected to a GPIO line (and optionally a GPIO alarm line),
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"
81   periodically, it will reset the system.
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
89   bus, data and clock line, by bit banging two GPIO lines. It will appear as
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
94   Consumer Electronics Control bus using only GPIO. It is used to communicate
95   with devices on the HDMI bus.
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
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
119 speed up your embedded hacking in particular by providing ready-made components.