Closes #208

Signed-off-by: Rahix <rahix@rahix.de>

Originally, commit 1a3dfad3 ("fix(bhi160): Fix interrupt behavior
during initialization") was supposed to fix the BHI160 axis-mapping
issue (see card10/firmware#133) but apparently on some devices it still
needs the original hack to work.  Revert the removal of the axis-mapping
hack from commit 2f56ff36 ("fix(bhi160): Call bhy_mapping_matrix_set
twice for the first time").

Fixes: 1a3dfad3 ("fix(bhi160): Fix interrupt behavior during initialization")
Link: card10/firmware#133

Signed-off-by: Rahix <rahix@rahix.de>

If initialization fails, bhi160 API calls should not infinitely block
waiting for it to complete; they should fail immediately with an error
stating that something went wrong.

Add a flag that indicates the driver to not accept API requests because
initialization was not finished properly.
Signed-off-by: Rahix <rahix@rahix.de>

As discussed in issue card10/firmware#133, the BHI160 changes its
interrupt behavior during initialization.  In commit 2f56ff36
("fix(bhi160): Call bhy_mapping_matrix_set twice for the first time")
a quick workaround for this issue was added.  Replace this hack with
a proper fix by reconfiguring the interrupt on the host side according
to the specification.

(Finally) fixes card10/firmware#133.

Fixes: 2f56ff36 ("fix(bhi160): Call bhy_mapping_matrix_set twice for the first time")
Link: card10/firmware#133 (comment 5894)

Signed-off-by: Rahix <rahix@rahix.de>

Port the bhi160 mutex and hwlock usage in bhi.c to the new mutex API.
This will hopefully increase system stability.
Signed-off-by: Rahix <rahix@rahix.de>

Rename hwlock_acquire() to hwlock_acquire_timeout() in preparation for
future changes to the hw-lock API.  Change all uses of the hw-lock API
to reflect this change.

This commit does not introduce any functional changes, except getting
rid of the timeout usage warnings.  This change is no-op, because the
hwlock_acquire() implementation already replaces any non-zero timeout
value with portMAX_DELAY.
Signed-off-by: Rahix <rahix@rahix.de>

Fix all warnings in epicardium/modules.
Signed-off-by: Rahix <rahix@rahix.de>

Newlib assert uses __assert_func and thus our panic() function while
MXC_ASSERT uses a custom assertion logic.  Newlib assert is also more
portable as it works in expression position while MXC_ASSERT only works
as a statement.
Signed-off-by: Rahix <rahix@rahix.de>

As discussed in card10/firmware!316, this commit prevents I2C lockup by
discarding overflowing samples instead of blocking until they have been
read.  This is not ideal as the samples read will not be the most recent
ones.  A deeper refactor of the sensor-stream internal API can fix this
in the future.

Cc: @flo_h

Signed-off-by: Rahix <rahix@rahix.de>

Due to a known issue (#133) the first call to bhy_mapping_matrix_set
can fail. This is a quick fix.

Signed-off-by: Rahix <rahix@rahix.de>

Signed-off-by: Rahix <rahix@rahix.de>

FIFO parsing would parse certain packets late because of an incorrect
assumption about FIFO-internals.
Signed-off-by: Rahix <rahix@rahix.de>

Related to #20.
Signed-off-by: Rahix <rahix@rahix.de>