Remove support for GPIO_ACCESS_BY_PORT in the config function
as configuration by port is going away.
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
Since the GPIO expander is a I2C device, any read/write to
the registers has high latency. Therefore, semaphore is
introduced to prevent multiple threads to manipulate
the GPIOs at the same time.
Also make sure that we are not doing I2C transactions
within ISRs.
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
Only update the internal register cache after successful write,
or else it would get out of sync with hardware.
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
The register pair for each port in the GPIO expander are
port 0 first then port 1. This would not work for big
endian systems with the u16_t port value. So need to
swap the byte ordering on such system.
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
The structures defined in the header file are only used by
the driver source file, and should not be used by others.
So roll the header file into the source file so it won't
get #include.
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
Use I2C burst write to write 2 bytes to each pair of registers
instead of 2 separate transactions of writing 1 byte.
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
PCA95XX is a series of compatible I2C-based GPIO expanders,
with common registers on input/output, polarity and configuration.
This renames the original PCAL9535A driver to PCA95XX to indicate
that it can support this series. Additional features on variants
are guarded by kconfigs.
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
2020-02-05 12:00:36 +01:00
Renamed from drivers/gpio/gpio_pcal9535a.c (Browse further)
