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  1. 17 5月, 2017 1 次提交
    • S
      iio: hid-sensor-hub: Implement batch mode · 138bc796
      由 Srinivas Pandruvada 提交于 
      HID sensor hubs using Integrated Senor Hub (ISH) has added capability to
support batch mode. This allows host processor to go to sleep for extended
duration, while the sensor hub is storing samples in its internal buffers.

'Commit f4f4673b ("iio: add support for hardware fifo")' implements
feature in IIO core to implement such feature. This feature is used in
bmc150-accel-core.c to implement batch mode. This implementation allows
software device buffer watermark to be used as a hint to adjust hardware
FIFO.

But HID sensor hubs don't allow to change internal buffer size of FIFOs.
Instead an additional usage id to set "maximum report latency" is defined.
This allows host to go to sleep upto this latency period without getting
any report. Since there is no ABI to set this latency, a new attribute
"hwfifo_timeout" is added so that user mode can specify a latency.

This change checks presence of usage id to get/set maximum report latency
and if present, it will expose hwfifo_timeout.
Signed-off-by: NSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
      138bc796
  3. 05 3月, 2017 1 次提交
  5. 11 2月, 2017 2 次提交
  7. 14 1月, 2017 1 次提交
  9. 05 1月, 2017 1 次提交
  11. 31 12月, 2016 1 次提交
  13. 02 10月, 2016 1 次提交
  15. 01 7月, 2016 1 次提交
  17. 30 5月, 2016 1 次提交
  19. 24 4月, 2016 2 次提交
    • G
      iio:imu:mpu6050: enhance mounting matrix support · eb379846
      由 Gregor Boirie 提交于 
      Add a new rotation matrix sysfs attribute compliant with IIO core
mounting matrix API.
Matrix is retrieved from "in_anglvel_mount_matrix" and
"in_accel_mount_matrix" sysfs attributes. It is declared into mpu6050 DTS
entry as a "mount-matrix" property.

Old interface is kept for backward userspace compatibility and may be
retrieved from legacy platform_data mechanism only.
Signed-off-by: NGregor Boirie <gregor.boirie@parrot.com>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
      eb379846
    • G
      iio:core: mounting matrix support · dfc57732
      由 Gregor Boirie 提交于 
      Expose a rotation matrix to indicate userspace the chip placement with
respect to the overall hardware system. This is needed to adjust
coordinates sampled from a sensor chip when its position deviates from the
main hardware system.

Final coordinates computation is delegated to userspace since:
* computation may involve floating point arithmetics ;
* it allows an application to combine adjustments with arbitrary
  transformations.

This 3 dimentional space rotation matrix is expressed as 3x3 array of
strings to support floating point numbers. It may be retrieved from a
"[<dir>_][<type>_]mount_matrix" sysfs attribute file. It is declared into a
device / driver specific DTS property or platform data.
Signed-off-by: NGregor Boirie <gregor.boirie@parrot.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
      dfc57732
  21. 03 4月, 2016 2 次提交
  23. 20 3月, 2016 1 次提交
  25. 09 2月, 2016 1 次提交
  27. 31 1月, 2016 1 次提交
  29. 04 1月, 2016 1 次提交
  31. 11 10月, 2015 1 次提交
  33. 01 10月, 2015 1 次提交
  35. 24 9月, 2015 3 次提交
  37. 09 8月, 2015 1 次提交
  39. 19 7月, 2015 2 次提交
  41. 14 6月, 2015 2 次提交
  43. 23 5月, 2015 1 次提交
  45. 17 5月, 2015 1 次提交
  47. 11 5月, 2015 1 次提交
  49. 09 4月, 2015 1 次提交
  51. 31 3月, 2015 1 次提交
  53. 29 3月, 2015 3 次提交
    • M
      Documentation/ABI:iio:fix typo · 5798cd23
      由 Martin Kepplinger 提交于 
      Signed-off-by: NMartin Kepplinger <martink@posteo.de>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
      5798cd23
    • O
      iio: add support for hardware fifo · f4f4673b
      由 Octavian Purdila 提交于 
      Some devices have hardware buffers that can store a number of samples
for later consumption. Hardware usually provides interrupts to notify
the processor when the FIFO is full or when it has reached a certain
watermark level. This helps with reducing the number of interrupts to
the host processor and thus it helps decreasing the power consumption.

This patch enables usage of hardware FIFOs for IIO devices in
conjunction with software device buffers. When the hardware FIFO is
enabled the samples are stored in the hardware FIFO. The samples are
later flushed to the device software buffer when the number of entries
in the hardware FIFO reaches the hardware watermark or when a flush
operation is triggered by the user when doing a non-blocking read
on an empty software device buffer.

In order to implement hardware FIFO support the device drivers must
implement the following new operations: setting and getting the
hardware FIFO watermark level, flushing the hardware FIFO to the
software device buffer. The device must also expose information about
the hardware FIFO such it's minimum and maximum watermark and if
necessary a list of supported watermark values. Finally, the device
driver must activate the hardware FIFO when the device buffer is
enabled, if the current device settings allows it.

The software device buffer watermark is passed by the IIO core to the
device driver as a hint for the hardware FIFO watermark. The device
driver can adjust this value to allow for hardware limitations (such
as capping it to the maximum hardware watermark or adjust it to a
value that is supported by the hardware). It can also disable the
hardware watermark (and implicitly the hardware FIFO) it this value is
below the minimum hardware watermark.

Since a driver may support hardware FIFO only when not in triggered
buffer mode (due to different semantics of hardware FIFO sampling and
triggered sampling) this patch changes the IIO core code to allow
falling back to non-triggered buffered mode if no trigger is enabled.
Signed-off-by: NOctavian Purdila <octavian.purdila@intel.com>
Reviewed-by: NLars-Peter Clausen <lars@metafoo.de>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
      f4f4673b
    • J
      iio: add watermark logic to iio read and poll · 37d34556
      由 Josselin Costanzi 提交于 
      Currently the IIO buffer blocking read only wait until at least one
data element is available.
This patch makes the reader sleep until enough data is collected before
returning to userspace. This should limit the read() calls count when
trying to get data in batches.

Co-author: Yannick Bedhomme <yannick.bedhomme@mobile-devices.fr>
Signed-off-by: NJosselin Costanzi <josselin.costanzi@mobile-devices.fr>
[rebased and remove buffer timeout]
Signed-off-by: NOctavian Purdila <octavian.purdila@intel.com>
Reviewed-by: NLars-Peter Clausen <lars@metafoo.de>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
      37d34556
  55. 28 3月, 2015 2 次提交
  57. 15 3月, 2015 2 次提交