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linux-next/tools/iio/Makefile
Alexandru Ardelean 8827faab2c tools: iio: convert iio_generic_buffer to use new IIO buffer API
This change makes use of the new IIO buffer API to read data from an IIO
buffer.
It doesn't read the /sys/bus/iio/devices/iio:deviceX/scan_elements dir
anymore, it reads /sys/bus/iio/devices/iio:deviceX/bufferY, where all the
scan_elements have been merged together with the old/classical buffer
attributes.

And it makes use of the new IIO_BUFFER_GET_FD_IOCTL ioctl to get an FD for
the IIO buffer for which to read data from.
It also does a quick sanity check to see that -EBUSY is returned if reading
the chardev after the ioctl() has succeeded.

This was tested with the following cases:
 1. Tested buffer0 works with ioctl()
 2. Tested that buffer0 can't be opened via /dev/iio:deviceX after ioctl()
    This check should be omitted under normal operation; it's being done
    here to check that the driver change is sane
 3. Moved valid buffer0 to be buffer1, and tested that data comes from it

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Link: https://lore.kernel.org/r/20210215104043.91251-25-alexandru.ardelean@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2021-03-11 20:47:07 +00:00

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2.1 KiB
Makefile

# SPDX-License-Identifier: GPL-2.0
include ../scripts/Makefile.include
bindir ?= /usr/bin
ifeq ($(srctree),)
srctree := $(patsubst %/,%,$(dir $(CURDIR)))
srctree := $(patsubst %/,%,$(dir $(srctree)))
endif
# Do not use make's built-in rules
# (this improves performance and avoids hard-to-debug behaviour);
MAKEFLAGS += -r
override CFLAGS += -O2 -Wall -g -D_GNU_SOURCE -I$(OUTPUT)include
ALL_TARGETS := iio_event_monitor lsiio iio_generic_buffer
ALL_PROGRAMS := $(patsubst %,$(OUTPUT)%,$(ALL_TARGETS))
all: $(ALL_PROGRAMS)
export srctree OUTPUT CC LD CFLAGS
include $(srctree)/tools/build/Makefile.include
#
# We need the following to be outside of kernel tree
#
$(OUTPUT)include/linux/iio: ../../include/uapi/linux/iio
mkdir -p $(OUTPUT)include/linux/iio 2>&1 || true
ln -sf $(CURDIR)/../../include/uapi/linux/iio/buffer.h $@
ln -sf $(CURDIR)/../../include/uapi/linux/iio/events.h $@
ln -sf $(CURDIR)/../../include/uapi/linux/iio/types.h $@
prepare: $(OUTPUT)include/linux/iio
IIO_UTILS_IN := $(OUTPUT)iio_utils-in.o
$(IIO_UTILS_IN): prepare FORCE
$(Q)$(MAKE) $(build)=iio_utils
LSIIO_IN := $(OUTPUT)lsiio-in.o
$(LSIIO_IN): prepare FORCE $(OUTPUT)iio_utils-in.o
$(Q)$(MAKE) $(build)=lsiio
$(OUTPUT)lsiio: $(LSIIO_IN)
$(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) $< -o $@
IIO_EVENT_MONITOR_IN := $(OUTPUT)iio_event_monitor-in.o
$(IIO_EVENT_MONITOR_IN): prepare FORCE $(OUTPUT)iio_utils-in.o
$(Q)$(MAKE) $(build)=iio_event_monitor
$(OUTPUT)iio_event_monitor: $(IIO_EVENT_MONITOR_IN)
$(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) $< -o $@
IIO_GENERIC_BUFFER_IN := $(OUTPUT)iio_generic_buffer-in.o
$(IIO_GENERIC_BUFFER_IN): prepare FORCE $(OUTPUT)iio_utils-in.o
$(Q)$(MAKE) $(build)=iio_generic_buffer
$(OUTPUT)iio_generic_buffer: $(IIO_GENERIC_BUFFER_IN)
$(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) $< -o $@
clean:
rm -f $(ALL_PROGRAMS)
rm -rf $(OUTPUT)include/linux/iio
find $(if $(OUTPUT),$(OUTPUT),.) -name '*.o' -delete -o -name '\.*.d' -delete
install: $(ALL_PROGRAMS)
install -d -m 755 $(DESTDIR)$(bindir); \
for program in $(ALL_PROGRAMS); do \
install $$program $(DESTDIR)$(bindir); \
done
FORCE:
.PHONY: all install clean FORCE prepare