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. 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 -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
