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SubjectRe: [RFC PATCH 0/3] Introduce IIO interface for fingerprint sensors

On 04/12/14 13:00, Teodora Baluta wrote:
> This patchset adds support for fingerprint sensors through the IIO interface.
> This way userspace applications collect information in a uniform way. All
> processing would be done in the upper layers as suggested in [0].
>
> In order to test out this proposal, a minimal implementation for UPEK's
> TouchChip Fingerprint Sensor via USB is also available. Although there is an
> existing implementation in userspace for USB fingerprint devices, including this
> particular device, the driver represents a proof of concept of how fingerprint
> sensors could be integrated in the IIO framework regardless of the used bus. For
> lower power requirements, the SPI bus is preferred and a kernel driver
> implementation makes more sense.

So why not v4l? These are effectively image sensors..
>
> A sysfs trigger is enabled and the device starts scanning. As soon as an image
> is available it is written in the character device /dev/iio:deviceX.
>
> Userspace applications will be able to calculate the expected image size using
> the fingerprint attributes height, width and bit depth. Other attributes
> introduced for the fingerprint channel in IIO represent information that aids in
> the fingerprint image processing. Besides these, the proposed interface offers
> userspace a way to read a feedback after a scan (like the swipe was too slow or
> too fast) through a modified fingerprint_status channel.
>
> [0] http://www.spinics.net/lists/linux-iio/msg11463.html
>
> Teodora Baluta (3):
> iio: core: add support for fingerprint devices
> iio: core: change channel's storagebits/realbits to u32
> iio: fingerprint: add fingerprint sensor via USB
>
> Documentation/ABI/testing/sysfs-bus-iio | 51 +++
> drivers/iio/Kconfig | 1 +
> drivers/iio/Makefile | 1 +
> drivers/iio/fingerprint/Kconfig | 15 +
> drivers/iio/fingerprint/Makefile | 5 +
> drivers/iio/fingerprint/fp_tc.c | 162 +++++++++
> drivers/iio/fingerprint/fp_tc.h | 22 ++
> drivers/iio/fingerprint/fp_tc_usb.c | 618 ++++++++++++++++++++++++++++++++
> drivers/iio/fingerprint/fp_tc_usb.h | 144 ++++++++
> drivers/iio/industrialio-core.c | 9 +
> include/linux/iio/iio.h | 11 +-
> include/linux/iio/types.h | 10 +
> 12 files changed, 1047 insertions(+), 2 deletions(-)
> create mode 100644 drivers/iio/fingerprint/Kconfig
> create mode 100644 drivers/iio/fingerprint/Makefile
> create mode 100644 drivers/iio/fingerprint/fp_tc.c
> create mode 100644 drivers/iio/fingerprint/fp_tc.h
> create mode 100644 drivers/iio/fingerprint/fp_tc_usb.c
> create mode 100644 drivers/iio/fingerprint/fp_tc_usb.h
>



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