[RFC PATCH v1 0/9] iio:st_sensors: fixes and lps22hb pressure sensor

[Gregor Boirie <gregor.boirie@parrot.com>]

This preliminary patch series adds support for a new ST LPS22HB pressure sensor
and introduce a few fixes related to st_pressure core and st_sensors triggered
buffering.
It is not meant to be reviewed for definitive inclusion as it touches too many
drivers / devices I cannot test with.
Note that as a few minor and more controversial patches (7, 8 and 9) might also
be candidate for a seperate series.

Patch 2 makes st_pressure sensors compliant with ABI and fixes a few missing
sampling gains. Scale / offset computation is modified to address all gains
currently possible. It impacts LPS331AP, LPS001WP and LPS25H sensors.
Please please please ! If anyone owning one of these could run some tests, I'd
be glad to get some feedback since I have none of them.

Patch 4 is a rework of the way st_sensors samples are stored in memory to comply
with IIO expected alignment contraints (some st_pressure samples are 24 bits
long). It is heavily based upon Linux Walleij' approach where each channel is
captured individually. See http://www.spinics.net/lists/linux-iio/msg24028.html
and http://www.spinics.net/lists/linux-iio/msg23598.html threads for more infos.
This patch impacts all st_sensors.
Please please please ! If anyone owning one of these could run some tests...

Patch 5 enforces 32 bits storage alignment for 24 bits long st_pressure
sampling channels.
Patch 6 enables triggered buffering for st_pressure temperature channels. We
need temperature samples to control on-board device temperature (noise and
drift removal).
Both patches impact st_pressure sensors mentionned above. Please please please !
If anyone owning one of these could run some tests...

Regards,
gregor.

Gregor Boirie (9):
  iio:st_pressure:initial lps22hb sensor support
  iio:st_pressure: fix sampling gains
  iio:st_pressure: lps22hb temperature support
  iio:st_sensors: align on storagebits boundaries
  iio:st_pressure: align storagebits on power of 2
  iio:st_pressure: temperature triggered buffering
  iio:st_sensors: unexport st_sensors_get_buffer_element
  iio:st_sensors: emulate SMBus block read if needed
  iio:st_sensors: fix power regulator usage

 .../devicetree/bindings/iio/st-sensors.txt         |   1 +
 drivers/iio/accel/st_accel_core.c                  |  12 +-
 drivers/iio/common/st_sensors/st_sensors_buffer.c  |  41 ++--
 drivers/iio/common/st_sensors/st_sensors_core.c    |  31 ++-
 drivers/iio/common/st_sensors/st_sensors_i2c.c     |   4 +-
 drivers/iio/gyro/st_gyro_core.c                    |  12 +-
 drivers/iio/magnetometer/st_magn_core.c            |  12 +-
 drivers/iio/pressure/Kconfig                       |   2 +-
 drivers/iio/pressure/st_pressure.h                 |   1 +
 drivers/iio/pressure/st_pressure_core.c            | 250 ++++++++++++++++-----
 drivers/iio/pressure/st_pressure_i2c.c             |   4 +
 drivers/iio/pressure/st_pressure_spi.c             |   1 +
 include/linux/iio/common/st_sensors.h              |   4 +-
 13 files changed, 278 insertions(+), 97 deletions(-)

-- 
2.1.4