mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 21:57:43 +00:00
8827faab2c
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>
71 lines
2.1 KiB
Makefile
71 lines
2.1 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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include ../scripts/Makefile.include
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bindir ?= /usr/bin
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ifeq ($(srctree),)
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srctree := $(patsubst %/,%,$(dir $(CURDIR)))
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srctree := $(patsubst %/,%,$(dir $(srctree)))
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endif
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# Do not use make's built-in rules
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# (this improves performance and avoids hard-to-debug behaviour);
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MAKEFLAGS += -r
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override CFLAGS += -O2 -Wall -g -D_GNU_SOURCE -I$(OUTPUT)include
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ALL_TARGETS := iio_event_monitor lsiio iio_generic_buffer
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ALL_PROGRAMS := $(patsubst %,$(OUTPUT)%,$(ALL_TARGETS))
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all: $(ALL_PROGRAMS)
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export srctree OUTPUT CC LD CFLAGS
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include $(srctree)/tools/build/Makefile.include
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#
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# We need the following to be outside of kernel tree
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#
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$(OUTPUT)include/linux/iio: ../../include/uapi/linux/iio
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mkdir -p $(OUTPUT)include/linux/iio 2>&1 || true
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ln -sf $(CURDIR)/../../include/uapi/linux/iio/buffer.h $@
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ln -sf $(CURDIR)/../../include/uapi/linux/iio/events.h $@
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ln -sf $(CURDIR)/../../include/uapi/linux/iio/types.h $@
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prepare: $(OUTPUT)include/linux/iio
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IIO_UTILS_IN := $(OUTPUT)iio_utils-in.o
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$(IIO_UTILS_IN): prepare FORCE
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$(Q)$(MAKE) $(build)=iio_utils
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LSIIO_IN := $(OUTPUT)lsiio-in.o
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$(LSIIO_IN): prepare FORCE $(OUTPUT)iio_utils-in.o
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$(Q)$(MAKE) $(build)=lsiio
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$(OUTPUT)lsiio: $(LSIIO_IN)
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$(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) $< -o $@
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IIO_EVENT_MONITOR_IN := $(OUTPUT)iio_event_monitor-in.o
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$(IIO_EVENT_MONITOR_IN): prepare FORCE $(OUTPUT)iio_utils-in.o
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$(Q)$(MAKE) $(build)=iio_event_monitor
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$(OUTPUT)iio_event_monitor: $(IIO_EVENT_MONITOR_IN)
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$(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) $< -o $@
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IIO_GENERIC_BUFFER_IN := $(OUTPUT)iio_generic_buffer-in.o
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$(IIO_GENERIC_BUFFER_IN): prepare FORCE $(OUTPUT)iio_utils-in.o
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$(Q)$(MAKE) $(build)=iio_generic_buffer
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$(OUTPUT)iio_generic_buffer: $(IIO_GENERIC_BUFFER_IN)
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$(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) $< -o $@
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clean:
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rm -f $(ALL_PROGRAMS)
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rm -rf $(OUTPUT)include/linux/iio
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find $(if $(OUTPUT),$(OUTPUT),.) -name '*.o' -delete -o -name '\.*.d' -delete
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install: $(ALL_PROGRAMS)
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install -d -m 755 $(DESTDIR)$(bindir); \
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for program in $(ALL_PROGRAMS); do \
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install $$program $(DESTDIR)$(bindir); \
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done
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FORCE:
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.PHONY: all install clean FORCE prepare
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