2015-07-09 07:31:22 -06:00
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#
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# For a description of the syntax of this configuration file,
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# see the file kconfig-language.txt in the NuttX tools repository.
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#
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2016-06-24 09:43:49 -06:00
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menu "IO Expander/GPIO Support"
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config IOEXPANDER
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bool "Enable IO Expander Support"
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default n
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---help---
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This directory holds implementations of IO expander drivers.
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See include/nuttx/ioexpander/ioexpander.h for registration information.
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if IOEXPANDER
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2021-12-08 12:08:25 +08:00
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config IOEXPANDER_RPMSG
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2023-10-27 12:56:33 +02:00
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bool "IO expander RPMSG server and client"
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2024-02-04 14:30:39 +08:00
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depends on RPMSG
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2021-12-08 12:08:25 +08:00
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default n
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2022-01-07 15:39:29 +08:00
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select IOEXPANDER_INT_ENABLE
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2021-12-08 12:08:25 +08:00
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---help---
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2023-10-27 12:56:33 +02:00
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This settings enable ioexpander RPMSG server and client.
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2021-12-08 12:08:25 +08:00
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if IOEXPANDER_RPMSG
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config IOEXPANDER_RPMSG_INT_NCALLBACKS
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2023-10-27 12:56:33 +02:00
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int "number of ioexpander RPMSG interrupt callbacks"
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2021-12-08 12:08:25 +08:00
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default 32
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---help---
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This set the IO expander number in interrupt callbacks.
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endif # IOEXPANDER_RPMSG
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2022-01-06 21:19:39 +08:00
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config IOEXPANDER_DUMMY
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bool "Simulated I/O Expander"
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default n
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select IOEXPANDER_INT_ENABLE
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---help---
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Build a simple, simulated I/O Expander chip simulation (for testing
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purposes only).
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if IOEXPANDER_DUMMY
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config IOEXPANDER_DUMMY_INT_NCALLBACKS
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int "Max number of interrupt callbacks"
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default 4
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---help---
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This is the maximum number of interrupt callbacks supported
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config IOEXPANDER_DUMMY_INT_POLLDELAY
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int "Interrupt poll delay (used)"
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default 500000
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---help---
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This microsecond delay defines the polling rate for missed interrupts.
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endif # IOEXPANDER_DUMMY
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ioexpander/ch422g: add a driver for the WCH CH422G I/O
The CH422G offers eight bi-directional pins, IO0-IO7, and four open-drain
outputs, OC0-OC3. It appears on boards that have run out of usable GPIOs
once a parallel RGB panel has taken its share, the Waveshare
ESP32-S3-Touch-LCD-7 among them, where it holds the panel and touch
controller in and out of reset and switches the backlight.
Two things about the device do not fit the shape a register-per-address
I2C driver usually takes, and both are handled here rather than pushed on
to board logic:
- A register is selected by the I2C address the transfer is addressed
to, not by a register address written ahead of the data. Each access
carries a single byte to one of four addresses.
- None of the write-only registers can be read back, so the driver
keeps a shadow copy of each and updates it in step with the device.
IO0-IO7 have no individual direction control; one bit of the system
parameter register drives the whole group. The driver records the
direction asked of each pin and puts the group in output mode once at
least one of them is an output, which is what a board that drives some of
the pins would expect. Reading a pin of a group held in output mode
reports the value last written, because the hardware cannot report the
level, and that is documented rather than hidden.
The four open-drain outputs are presented as pins 8-11 of the same
ioexpander_dev_s so that one instance covers the chip, which means
CONFIG_IOEXPANDER_NPINS must be at least 12.
Builds clean with no new warnings on esp32s3-touch-lcd7:usbnsh and passes
nxstyle.
Signed-off-by: Alan Carvalho de Assis <acassis@gmail.com>
Assisted-by: Claude Code
2026-08-23 13:34:17 -03:00
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config IOEXPANDER_CH422G
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bool "CH422G I2C IO expander"
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default n
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depends on I2C
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---help---
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Enable support for the WCH CH422G IO Expander, which offers eight
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bi-directional pins, IO0-IO7, and four open-drain outputs, OC0-OC3.
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IO0-IO7 share a single direction control in the hardware. The
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driver puts the group in output mode when at least one of them has
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been configured as an output.
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2024-01-23 14:46:08 +01:00
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config IOEXPANDER_ICJX
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bool "iC-JX SPI IO expander"
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default n
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depends on SPI
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---help---
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Enable support for the iC-JX expander from iC-Haus GmbH manufacturer.
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SPI peripheral is used for the communication.
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if IOEXPANDER_ICJX
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2024-05-06 10:45:56 +02:00
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config ICJX_MULTIPLE
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2024-01-23 14:46:08 +01:00
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bool "Multiple iC-JX Devices"
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default n
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---help---
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Can be defined to support multiple iC-JX devices on board.
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2024-05-06 10:45:56 +02:00
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config ICJX_INT_ENABLE
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bool "Enable iC-JX Interrupt Support"
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default n
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select IOEXPANDER_INT_ENABLE
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---help---
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Enable driver interrupt functionality
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2024-01-23 14:46:08 +01:00
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endif # IOEXPANDER_ICJX
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2023-08-22 13:12:19 +02:00
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config IOEXPANDER_ISO1H812G
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bool "ISO1H812G SPI IO expander"
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default n
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depends on SPI
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---help---
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Enable support for the ISO1H812G SPI IO expander.
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if IOEXPANDER_ISO1H812G
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config ISO1H812G_MULTIPLE
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bool "Multiple ISO1H812G Devices"
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default n
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---help---
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Can be defined to support multiple ISO1H812G devices on board.
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endif # IOEXPANDER_ISO1H812G
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2023-08-04 14:12:01 +02:00
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config IOEXPANDER_ISO1I813T
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bool "ISO1I813T SPI IO expander"
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default n
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depends on SPI
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---help---
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Enable support for the ISO1I813T SPI IO expander.
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if IOEXPANDER_ISO1I813T
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config ISO1I813T_MULTIPLE
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bool "Multiple ISO1I813T Devices"
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default n
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---help---
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Can be defined to support multiple ISO1I813T devices on board.
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endif # IOEXPANDER_ISO1I813T
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2023-09-02 09:59:20 -03:00
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config IOEXPANDER_MCP23X08
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bool "MCP23008/MCP23S08 I2C/SPI IO expander"
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default n
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depends on I2C
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---help---
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Enable support for the MCP23008/MCP23S08 IO Expander
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if IOEXPANDER_MCP23X08
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config MCP23X08_MULTIPLE
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bool "Multiple MCP23x08 Devices"
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default n
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---help---
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Can be defined to support multiple MCP23x08 devices on board.
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config MCP23X08_INT_ENABLE
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bool "Enable MCP23x08 Interrupt Support"
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default n
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select IOEXPANDER_INT_ENABLE
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---help---
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Enable driver interrupt functionality
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config MCP23X08_INT_NCALLBACKS
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int "Max number of interrupt callbacks"
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default 4
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depends on MCP23X08_INT_ENABLE
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---help---
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This is the maximum number of interrupt callbacks supported
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config MCP23X08_INT_POLL
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bool "Enable interrupt poll"
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default n
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---help---
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Enable polling for missed interrupts.
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config MCP23X08_INT_POLLDELAY
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int "Interrupt poll delay (used)"
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default 500000
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depends on MCP23X08_INT_POLL
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---help---
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This microsecond delay defines the polling rate for missed interrupts.
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endif # IOEXPANDER_MCP23X08
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2021-05-15 15:39:27 -03:00
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config IOEXPANDER_MCP23X17
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bool "MCP23017/MCP23S17 I2C/SPI IO expander"
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default n
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depends on I2C
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---help---
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Enable support for the MCP23017/MCP23S17 IO Expander
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if IOEXPANDER_MCP23X17
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config MCP23X17_MULTIPLE
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bool "Multiple MCP23x17 Devices"
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default n
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---help---
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Can be defined to support multiple MCP23x17 devices on board.
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config MCP23X17_INT_ENABLE
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bool "Enable MCP23x17 Interrupt Support"
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default n
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select IOEXPANDER_INT_ENABLE
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---help---
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Enable driver interrupt functionality
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2023-03-05 18:38:24 +01:00
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config MCP23X17_INT_MIRROR
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bool "Enable MCP23x17 Interrupt Mirror"
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default n
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select MCP23X17_INT_ENABLE
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---help---
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Enable driver interrupt mirror functionality
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2021-05-15 15:39:27 -03:00
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config MCP23X17_INT_NCALLBACKS
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int "Max number of interrupt callbacks"
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default 4
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depends on MCP23X17_INT_ENABLE
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---help---
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This is the maximum number of interrupt callbacks supported
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config MCP23X17_INT_POLL
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bool "Enable interrupt poll"
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default n
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---help---
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Enable polling for missed interrupts.
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config MCP23X17_INT_POLLDELAY
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int "Interrupt poll delay (used)"
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default 500000
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depends on MCP23X17_INT_POLL
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---help---
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This microsecond delay defines the polling rate for missed interrupts.
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endif # IOEXPANDER_MCP23X17
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2015-07-09 07:31:22 -06:00
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config IOEXPANDER_PCA9555
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bool "PCA9555 I2C IO expander"
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default n
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2016-08-03 09:44:48 -06:00
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depends on I2C
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2015-07-09 07:31:22 -06:00
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---help---
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Enable support for the NXP PCA9555 IO Expander
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if IOEXPANDER_PCA9555
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config PCA9555_MULTIPLE
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bool "Multiple PCA9555 Devices"
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default n
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---help---
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Can be defined to support multiple PCA9555 devices on board.
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2015-11-17 14:09:43 +01:00
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config PCA9555_INT_ENABLE
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bool "Enable PCA9555 Interrupt Support"
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default n
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select IOEXPANDER_INT_ENABLE
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2015-07-09 07:31:22 -06:00
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---help---
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2015-11-17 14:09:43 +01:00
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Enable driver interrupt functionality
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2015-07-09 07:31:22 -06:00
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2016-07-31 11:09:02 -06:00
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config PCA9555_INT_NCALLBACKS
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int "Max number of interrupt callbacks"
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default 4
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2016-07-31 19:52:44 -06:00
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depends on PCA9555_INT_ENABLE
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2016-07-31 11:09:02 -06:00
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---help---
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This is the maximum number of interrupt callbacks supported
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2016-08-01 11:10:11 -06:00
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config PCA9555_SHADOW_MODE
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bool "Use Shadow Mode instead of Read-Modify-Write Operations"
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default n
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---help---
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This setting enables a mode where the output and pin
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configuration registers are held in RAM.
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With this for example we do not need to read back the
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output-register every time we want to change one pin.
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We do instead change the bit in the internal register
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and then just write this register to the IO-Expander.
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This reduces bus traffic and eliminates the problem of
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EMC-caused toggling of output pins.
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config PCA9555_RETRY
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bool "Retry to send commands and data at I2C communication errors"
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default n
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---help---
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Retry to send commands and data if a I2C-communication
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error occurs (eg. caused by EMC).
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2015-07-09 07:31:22 -06:00
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endif # IOEXPANDER_PCA9555
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2015-11-17 14:09:43 +01:00
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2020-02-19 10:09:52 -05:00
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config IOEXPANDER_PCA9538
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bool "PCA9538 I2C IO expander"
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default n
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depends on I2C
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---help---
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Enable support for the NXP PCA9538 IO Expander
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if IOEXPANDER_PCA9538
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config PCA9538_MULTIPLE
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bool "Multiple PCA9538 Devices"
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default n
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---help---
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Can be defined to support multiple PCA9538 devices on board.
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config PCA9538_INT_ENABLE
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bool "Enable PCA9538 Interrupt Support"
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default n
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select IOEXPANDER_INT_ENABLE
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---help---
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Enable driver interrupt functionality
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config PCA9538_INT_NCALLBACKS
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int "Max number of interrupt callbacks"
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default 4
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depends on PCA9538_INT_ENABLE
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---help---
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This is the maximum number of interrupt callbacks supported
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config PCA9538_SHADOW_MODE
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bool "Use Shadow Mode instead of Read-Modify-Write Operations"
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default n
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---help---
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This setting enables a mode where the output and pin
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configuration registers are held in RAM.
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|
|
With this for example we do not need to read back the
|
|
|
|
|
output-register every time we want to change one pin.
|
|
|
|
|
We do instead change the bit in the internal register
|
|
|
|
|
and then just write this register to the IO-Expander.
|
|
|
|
|
This reduces bus traffic and eliminates the problem of
|
|
|
|
|
EMC-caused toggling of output pins.
|
|
|
|
|
|
|
|
|
|
config PCA9538_RETRY
|
|
|
|
|
bool "Retry to send commands and data at I2C communication errors"
|
|
|
|
|
default n
|
|
|
|
|
---help---
|
|
|
|
|
Retry to send commands and data if a I2C-communication
|
|
|
|
|
error occurs (eg. caused by EMC).
|
|
|
|
|
|
|
|
|
|
endif # IOEXPANDER_PCA9538
|
|
|
|
|
|
2026-07-24 08:12:46 -03:00
|
|
|
config IOEXPANDER_PI4IOE5V6408
|
|
|
|
|
bool "PI4IOE5V6408 I2C IO expander"
|
|
|
|
|
default n
|
|
|
|
|
depends on I2C
|
|
|
|
|
---help---
|
|
|
|
|
Enable support for the Diodes Incorporated PI4IOE5V6408
|
|
|
|
|
8-bit I2C I/O expander.
|
|
|
|
|
|
|
|
|
|
if IOEXPANDER_PI4IOE5V6408
|
|
|
|
|
|
|
|
|
|
config PI4IOE5V6408_INT_ENABLE
|
|
|
|
|
bool "Enable PI4IOE5V6408 interrupt support"
|
|
|
|
|
default n
|
|
|
|
|
select IOEXPANDER_INT_ENABLE
|
|
|
|
|
select SCHED_HPWORK
|
|
|
|
|
---help---
|
|
|
|
|
Enable the PI4IOE5V6408 interrupt callback interface. The board
|
|
|
|
|
must provide hooks for the device's active-low interrupt pin.
|
|
|
|
|
|
|
|
|
|
config PI4IOE5V6408_INT_NCALLBACKS
|
|
|
|
|
int "Max number of interrupt callbacks"
|
|
|
|
|
default 4
|
|
|
|
|
depends on PI4IOE5V6408_INT_ENABLE
|
|
|
|
|
---help---
|
|
|
|
|
This is the maximum number of interrupt callbacks supported.
|
|
|
|
|
|
|
|
|
|
endif # IOEXPANDER_PI4IOE5V6408
|
|
|
|
|
|
2025-03-24 19:48:47 +08:00
|
|
|
config IOEXPANDER_PCA9557
|
|
|
|
|
bool "PCA9557 I2C IO expander"
|
|
|
|
|
default n
|
|
|
|
|
depends on I2C
|
|
|
|
|
---help---
|
|
|
|
|
Enable support for the NXP PCA9557 IO Expander
|
|
|
|
|
|
|
|
|
|
if IOEXPANDER_PCA9557
|
|
|
|
|
|
|
|
|
|
config PCA9557_SHADOW_MODE
|
|
|
|
|
bool "Use Shadow Mode instead of Read-Modify-Write Operations"
|
|
|
|
|
default n
|
|
|
|
|
---help---
|
|
|
|
|
This setting enables a mode where the output and pin
|
|
|
|
|
configuration registers are held in RAM.
|
|
|
|
|
With this for example we do not need to read back the
|
|
|
|
|
output-register every time we want to change one pin.
|
|
|
|
|
We do instead change the bit in the internal register
|
|
|
|
|
and then just write this register to the IO-Expander.
|
|
|
|
|
This reduces bus traffic and eliminates the problem of
|
|
|
|
|
EMC-caused toggling of output pins.
|
|
|
|
|
|
|
|
|
|
config PCA9557_RETRY
|
|
|
|
|
bool "Retry to send commands and data at I2C communication errors"
|
|
|
|
|
default n
|
|
|
|
|
---help---
|
|
|
|
|
Retry to send commands and data if a I2C-communication
|
|
|
|
|
error occurs (eg. caused by EMC).
|
|
|
|
|
|
|
|
|
|
endif # IOEXPANDER_PCA9557
|
|
|
|
|
|
2016-07-31 19:52:44 -06:00
|
|
|
config IOEXPANDER_TCA64XX
|
|
|
|
|
bool "TCA64XX I2C IO expander"
|
|
|
|
|
default n
|
2016-08-03 09:44:48 -06:00
|
|
|
depends on I2C && EXPERIMENTAL
|
2016-07-31 19:52:44 -06:00
|
|
|
---help---
|
2016-08-01 11:10:11 -06:00
|
|
|
Enable support for the TCA64XX IO Expander
|
2016-07-31 19:52:44 -06:00
|
|
|
|
|
|
|
|
if IOEXPANDER_TCA64XX
|
|
|
|
|
|
|
|
|
|
config TCA64XX_MULTIPLE
|
|
|
|
|
bool "Multiple TCA64XX Devices"
|
|
|
|
|
default n
|
|
|
|
|
---help---
|
|
|
|
|
Can be defined to support multiple TCA64XX devices on board.
|
|
|
|
|
|
|
|
|
|
config TCA64XX_INT_ENABLE
|
|
|
|
|
bool "Enable TCA64XX Interrupt Support"
|
|
|
|
|
default n
|
|
|
|
|
select IOEXPANDER_INT_ENABLE
|
|
|
|
|
---help---
|
|
|
|
|
Enable driver interrupt functionality
|
|
|
|
|
|
|
|
|
|
config TCA64XX_INT_NCALLBACKS
|
|
|
|
|
int "Max number of interrupt callbacks"
|
|
|
|
|
default 4
|
|
|
|
|
depends on TCA64XX_INT_ENABLE
|
|
|
|
|
---help---
|
|
|
|
|
This is the maximum number of interrupt callbacks supported
|
|
|
|
|
|
|
|
|
|
config TCA64XX_INT_POLL
|
|
|
|
|
bool "Enable interrupt poll"
|
|
|
|
|
default n
|
|
|
|
|
---help---
|
|
|
|
|
Enable polling for missed interrupts.
|
|
|
|
|
|
|
|
|
|
config TCA64XX_INT_POLLDELAY
|
|
|
|
|
int "Interrupt poll delay (used)"
|
|
|
|
|
default 500000
|
|
|
|
|
depends on TCA64XX_INT_POLL
|
|
|
|
|
---help---
|
|
|
|
|
This microsecond delay defines the polling rate for missed interrupts.
|
|
|
|
|
|
|
|
|
|
endif # IOEXPANDER_TCA64XX
|
|
|
|
|
|
2016-08-01 11:10:11 -06:00
|
|
|
config IOEXPANDER_PCF8574
|
|
|
|
|
bool "PCF8574 I2C IO expander"
|
|
|
|
|
default n
|
2016-08-03 09:44:48 -06:00
|
|
|
depends on I2C && EXPERIMENTAL
|
2016-08-01 11:10:11 -06:00
|
|
|
---help---
|
|
|
|
|
Enable support for the PCF8574 IO Expander
|
|
|
|
|
|
|
|
|
|
if IOEXPANDER_PCF8574
|
|
|
|
|
|
|
|
|
|
config PCF8574_MULTIPLE
|
|
|
|
|
bool "Multiple PCF8574 Devices"
|
|
|
|
|
default n
|
|
|
|
|
---help---
|
|
|
|
|
Can be defined to support multiple PCF8574 devices on board.
|
|
|
|
|
|
|
|
|
|
config PCF8574_INT_ENABLE
|
|
|
|
|
bool "Enable PCF8574 Interrupt Support"
|
|
|
|
|
default n
|
|
|
|
|
select IOEXPANDER_INT_ENABLE
|
|
|
|
|
---help---
|
|
|
|
|
Enable driver interrupt functionality
|
|
|
|
|
|
|
|
|
|
config PCF8574_INT_NCALLBACKS
|
|
|
|
|
int "Max number of interrupt callbacks"
|
|
|
|
|
default 4
|
|
|
|
|
depends on PCF8574_INT_ENABLE
|
|
|
|
|
---help---
|
|
|
|
|
This is the maximum number of interrupt callbacks supported
|
|
|
|
|
|
|
|
|
|
config PCF8574_INT_POLL
|
|
|
|
|
bool "Enable interrupt poll"
|
|
|
|
|
default n
|
|
|
|
|
---help---
|
|
|
|
|
Enable polling for missed interrupts.
|
|
|
|
|
|
|
|
|
|
config PCF8574_INT_POLLDELAY
|
|
|
|
|
int "Interrupt poll delay (used)"
|
|
|
|
|
default 500000
|
|
|
|
|
depends on PCF8574_INT_POLL
|
|
|
|
|
---help---
|
|
|
|
|
This microsecond delay defines the polling rate for missed interrupts.
|
|
|
|
|
|
|
|
|
|
endif # IOEXPANDER_PCF8574
|
|
|
|
|
|
2023-08-01 16:25:06 +02:00
|
|
|
config IOEXPANDER_PCF8575
|
|
|
|
|
bool "PCF8575 I2C IO expander"
|
|
|
|
|
default n
|
|
|
|
|
depends on I2C
|
|
|
|
|
---help---
|
|
|
|
|
Enable support for 16 bit PCF8575 IO Expander. Software driver
|
|
|
|
|
interrupt is currently not supported therefore decated HW interrupt
|
|
|
|
|
pin should be used.
|
|
|
|
|
|
|
|
|
|
if IOEXPANDER_PCF8575
|
|
|
|
|
|
|
|
|
|
config PCF8575_MULTIPLE
|
|
|
|
|
bool "Multiple PCF8575 Devices"
|
|
|
|
|
default n
|
|
|
|
|
---help---
|
|
|
|
|
Can be defined to support multiple PCF8575 devices on board.
|
|
|
|
|
|
|
|
|
|
endif # IOEXPANDER_PCF8575
|
|
|
|
|
|
2023-06-24 15:08:27 +02:00
|
|
|
config IOEXPANDER_SX1509
|
|
|
|
|
bool "SX1509 I2C IO expander"
|
|
|
|
|
default n
|
|
|
|
|
depends on I2C
|
|
|
|
|
---help---
|
|
|
|
|
Enable support for the SX1509 IO Expander
|
|
|
|
|
|
|
|
|
|
if IOEXPANDER_SX1509
|
|
|
|
|
|
|
|
|
|
config SX1509_MULTIPLE
|
|
|
|
|
bool "Multiple SX1509 Devices"
|
|
|
|
|
default n
|
|
|
|
|
---help---
|
|
|
|
|
Can be defined to support multiple SX1509 devices on board.
|
|
|
|
|
|
|
|
|
|
config SX1509_INT_ENABLE
|
|
|
|
|
bool "Enable SX1509 Interrupt Support"
|
|
|
|
|
default n
|
|
|
|
|
select IOEXPANDER_INT_ENABLE
|
|
|
|
|
---help---
|
|
|
|
|
Enable driver interrupt functionality
|
|
|
|
|
|
|
|
|
|
config SX1509_LED_ENABLE
|
|
|
|
|
bool "Enable SX1509 LED Support"
|
|
|
|
|
default n
|
|
|
|
|
select IOEXPANDER_LED_ENABLE
|
|
|
|
|
---help---
|
|
|
|
|
Enable driver LED functionality
|
|
|
|
|
|
|
|
|
|
config SX1509_INT_NCALLBACKS
|
|
|
|
|
int "Max number of interrupt callbacks"
|
|
|
|
|
default 4
|
|
|
|
|
depends on SX1509_INT_ENABLE
|
|
|
|
|
---help---
|
|
|
|
|
This is the maximum number of interrupt callbacks supported
|
|
|
|
|
|
|
|
|
|
config SX1509_RETRY
|
|
|
|
|
bool "Retry to send commands and data at I2C communication errors"
|
|
|
|
|
default n
|
|
|
|
|
---help---
|
|
|
|
|
Retry to send commands and data if a I2C-communication
|
|
|
|
|
error occurs (eg. caused by EMC).
|
|
|
|
|
|
|
|
|
|
endif # IOEXPANDER_SX1509
|
|
|
|
|
|
2025-08-29 13:01:34 +10:00
|
|
|
config IOEXPANDER_AW9523B
|
|
|
|
|
bool "AW9523B I2C IO expander"
|
|
|
|
|
default n
|
|
|
|
|
depends on I2C
|
|
|
|
|
---help---
|
|
|
|
|
Enable support for the Awinic AW9523B IO Expander
|
|
|
|
|
|
|
|
|
|
if IOEXPANDER_AW9523B
|
|
|
|
|
|
|
|
|
|
config AW9523B_MULTIPLE
|
|
|
|
|
bool "Multiple AW9523B Devices"
|
|
|
|
|
default n
|
|
|
|
|
---help---
|
|
|
|
|
Can be defined to support multiple AW9523B devices on board.
|
|
|
|
|
|
|
|
|
|
config AW9523B_LED_ENABLE
|
|
|
|
|
bool "Enable AW9523B LED Support"
|
|
|
|
|
default y
|
|
|
|
|
---help---
|
|
|
|
|
Enable driver LED functionality
|
|
|
|
|
|
|
|
|
|
config AW9523B_INT_ENABLE
|
|
|
|
|
bool "Enable AW9523B Interrupt Support"
|
|
|
|
|
default n
|
|
|
|
|
select IOEXPANDER_INT_ENABLE
|
|
|
|
|
---help---
|
|
|
|
|
Enable driver interrupt functionality
|
|
|
|
|
|
|
|
|
|
config AW9523B_INT_NCALLBACKS
|
|
|
|
|
int "Max number of interrupt callbacks"
|
|
|
|
|
default 4
|
|
|
|
|
depends on AW9523B_INT_ENABLE
|
|
|
|
|
---help---
|
|
|
|
|
This is the maximum number of interrupt callbacks supported
|
|
|
|
|
|
|
|
|
|
config AW9523B_SHADOW_MODE
|
|
|
|
|
bool "Use Shadow Mode instead of Read-Modify-Write Operations"
|
|
|
|
|
default n
|
|
|
|
|
---help---
|
|
|
|
|
This setting enables a mode where the output and pin
|
|
|
|
|
configuration registers are held in RAM.
|
|
|
|
|
With this for example we do not need to read back the
|
|
|
|
|
output-register every time we want to change one pin.
|
|
|
|
|
We do instead change the bit in the internal register
|
|
|
|
|
and then just write this register to the IO-Expander.
|
|
|
|
|
This reduces bus traffic and eliminates the problem of
|
|
|
|
|
EMC-caused toggling of output pins.
|
|
|
|
|
|
|
|
|
|
config AW9523B_RETRY
|
|
|
|
|
bool "Retry to send commands and data at I2C communication errors"
|
|
|
|
|
default n
|
|
|
|
|
---help---
|
|
|
|
|
Retry to send commands and data if a I2C-communication
|
|
|
|
|
error occurs (eg. caused by EMC).
|
|
|
|
|
|
|
|
|
|
endif # IOEXPANDER_AW9523B
|
|
|
|
|
|
2015-11-17 14:09:43 +01:00
|
|
|
config IOEXPANDER_INT_ENABLE
|
|
|
|
|
bool
|
2016-07-31 19:52:44 -06:00
|
|
|
default n
|
2015-11-17 14:09:43 +01:00
|
|
|
---help---
|
|
|
|
|
This is the global INT supported flag for io expanders
|
|
|
|
|
|
2023-06-24 15:08:27 +02:00
|
|
|
config IOEXPANDER_LED_ENABLE
|
|
|
|
|
bool
|
|
|
|
|
default n
|
|
|
|
|
select USERLED
|
|
|
|
|
---help---
|
|
|
|
|
This is the global LED supported flag for io expanders
|
|
|
|
|
|
2016-07-31 11:09:02 -06:00
|
|
|
config IOEXPANDER_NPINS
|
|
|
|
|
int "Number of pins"
|
|
|
|
|
default 16
|
|
|
|
|
---help---
|
|
|
|
|
Maximum number of pins supported per driver.
|
|
|
|
|
|
2015-11-17 14:09:43 +01:00
|
|
|
config IOEXPANDER_MULTIPIN
|
|
|
|
|
bool "Support multi-pin access routines"
|
|
|
|
|
default n
|
|
|
|
|
---help---
|
|
|
|
|
This settings enable the definition of routines for
|
|
|
|
|
optimized simultaneous access to multiple pins.
|
2016-06-24 09:43:49 -06:00
|
|
|
|
|
|
|
|
endif # IOEXPANDER
|
|
|
|
|
|
|
|
|
|
config DEV_GPIO
|
|
|
|
|
bool "GPIO driver"
|
|
|
|
|
default n
|
|
|
|
|
---help---
|
|
|
|
|
Enables a simple GPIO input/output driver to support application-
|
|
|
|
|
space testing of hardware.
|
|
|
|
|
|
drivers/ioexpander: List the registered pins in /proc/gpio.
The pins a board publishes are visible in /dev and each can be read
through its own node, but surveying a whole board that way means an open
and two ioctls per pin, and the signal and interrupt counters the upper
half keeps are not reachable through any of them.
Adds a list of registered pins and publishes it as /proc/gpio, behind
GPIO_PROCFS: a quality of life view of the same kind as /proc/pinctrl
and /proc/reset. Every common field comes from state the upper half
already holds: the pin type, the value through go_read(), how many times
the pin has been registered for signals, and how many interrupts it has
taken. Lines carry the same key:value tokens in the same order, so the
file is machine parseable.
Lower halves may supply an optional go_describe() adding what only they
can say, such as which pad carries the line or how its trigger is
configured. It writes text into a caller supplied buffer and the upper
half owns the line, so a lower half needs no procfs knowledge. A lower
half without it is listed with the common tokens alone.
The pin type index is bounded before use: it comes from the lower half
and the name table cannot cover a type the enumeration does not define.
A pin that cannot be read reports val:- rather than a zero that would
read as a real level.
procfs_register() appends without checking for duplicates, so the entry
is claimed once for the lifetime of the system rather than whenever the
list is empty; pins come and go at run time.
The name is held in a buffer as long as the one gpio_pin_register()
accepts, so a listing always names the same string as /dev.
The pin type name table is declared without an explicit size so that the
assertion beside it compares against the enumeration and can fail; sized
as [GPIO_NPINTYPES] it would have been tautological.
Documents the entry, its tokens, and how a lower half describes a pin.
Off by default: with GPIO_PROCFS unset the list, the lock and the procfs
entry are compiled out, and go_describe() is one more member at the end
of a structure existing lower halves do not reach.
Assisted-by: Claude:claude-opus-5
Signed-off-by: Justin Hammond <justin@dynam.ac>
2026-08-02 18:54:39 +08:00
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config GPIO_PROCFS
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bool "GPIO procfs entry"
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default n
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depends on DEV_GPIO && FS_PROCFS && FS_PROCFS_REGISTER
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---help---
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Create /proc/gpio, listing every registered pin with its type,
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its current value, and how many times it has been registered for
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signals and taken an interrupt.
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The pins are visible in /dev and each can be read through its own
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node, but surveying a board that way means an open and two ioctls
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per pin, and the counters are not reachable through any of them.
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A lower half that supplies the optional go_describe method also
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contributes whatever only it can say, such as which pad carries
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the line.
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2024-01-22 14:13:48 +08:00
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config DEV_GPIO_NPOLLWAITERS
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int "Max number of polls"
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default 1
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depends on DEV_GPIO
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---help---
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The maximum number of polls that can be registered with the GPIO
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driver
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2018-11-08 08:29:22 -06:00
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config DEV_GPIO_NSIGNALS
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int "Max number of signals"
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default 1
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2026-01-19 09:38:26 +08:00
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depends on DEV_GPIO && !DISABLE_ALL_SIGNALS
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2018-11-08 08:29:22 -06:00
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---help---
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The maximum number of signals that can be registered with the GPIO
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driver
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2016-08-01 08:43:10 -06:00
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config GPIO_LOWER_HALF
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bool "GPIO Lower Half"
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default n
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depends on DEV_GPIO && IOEXPANDER
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---help---
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Enable support for a lower half driver that provides GPIO driver
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support for I/O expander pins.
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2018-08-27 09:25:11 -06:00
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if GPIO_LOWER_HALF
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config GPIO_LOWER_HALF_INTTYPE
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int "default interrupt type for GPIO_INTERRUPT_PIN pintype"
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default 14
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---help---
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This is the default interrupt type (IOEXPANDER_VAL_BOTH) for
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GPIO_INTERRUPT_PIN pintype in gplf driver register.
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endif
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2016-06-24 09:43:49 -06:00
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endmenu # IO Expander/GPIO Support
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