Sorry for spawning a new patch set so quickly, but based on the comments from Lars I rewrote the read watermark logic and the patches are now hopefully easier to review than the previous patch set. Changes since v4: * rewrite the watermark read logic to fix an undeflow issue and allow draining when the buffer is disabled * manipulate the watermark field under the device lock * use wake_up_interruptible_poll * bmc150: flush the fifo before disabling the buffer and take the device mutex when emabling/disabling the fifo Changes since v3: * remove hwfifo_length and make hwfifo_watermark read-only * remove trigger for hardware fifo * use the buffer watermark as a hint for the hardware fifo * hwfifo_watermark is negative if the device does not support hardware fifo, 0 if hardware fifo is supported but currently disabled and a strictly positive value if hardware fifo is enabled in which case this is the watermark for the hardware fifo * the hardware fifo is activated by the device driver when it makes sense (e.g. at buffer enable time if there is no conflicting trigger) * move the hwfifo operations to struct iio_info * remove the flush from the poll operation - it causes unnecessary flush operations * move the wait condition logic in a separate function to make it more readable * bmc150: make sure to check the I2C bus supports either full i2c or at least SMBUS i2c block read as fifo reads must do a burst read of the whole frame (all 3 axis) * bmc150: rework the way we timestamp the samples stored in the fifo to account for sampling frequency variations from device to device Josselin Costanzi (1): iio: add watermark logic to iio read and poll Octavian Purdila (2): iio: add support for hardware fifo iio: bmc150_accel: add support for hardware fifo Documentation/ABI/testing/sysfs-bus-iio | 40 ++++ drivers/iio/accel/bmc150-accel.c | 363 +++++++++++++++++++++++++++++-- drivers/iio/industrialio-buffer.c | 177 +++++++++++++-- drivers/iio/kfifo_buf.c | 11 +- drivers/staging/iio/accel/sca3000_ring.c | 4 +- include/linux/iio/buffer.h | 8 +- include/linux/iio/iio.h | 26 +++ 7 files changed, 581 insertions(+), 48 deletions(-) -- 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
