The adis16400 and similar have two different base sampling rate available, from
which the actual sampling rate is derived. 1638 Hz and 52.85 Hz, switching to
the lower base sampling rate allows to support lower sampling rates.

This patch adds support for switching to the lower base sampling rate if the
requested sampling frequency is outside of the range which can be supported by
the higher base sampling rate.

The function which is used to read the current sampling rate already has support
for the lower sampling rate, so no changes are required there.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

The devices supported by this drivers support sample rates with less than one
sample per second. To support this increase the samplerate precession to allow
setting (and reading) the samplerate with a milli-HZ precession.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

This adis16400 driver is in pretty good shape now, so move it out of staging.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

Do a set of minor miscellaneous code style cleanups for the adis16400 before
moving it out of staging. Delete outdated comments, removed excess whitespace,
add missing whitespace, replace u{8,16} with uint{8,16}_t.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

While the samplerate supported by the devices which are supported by this driver
is not continuous it supports a wide range, much more than currently listed in
the samplerate_available attribute. Also it accepts all values written to the
samplerate attribute and will round-up them to the nearest supported sample
rate. So remove the samplerate_available attribute.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

To be compliant to the IIO specification we should not include the "SPS" suffix
in the "samplerate" attribute contents.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

Similar to like we already did for the generic adis library preallocate and
pre-construct the SPI transfer message for the adis16400. For devices which do
not support burst mode sampling does not differ from other adis devices and so
we use the generic functions of the adis library in this case. In burst mode we
can only sample all channels at once, so use the IIO cores demux facility
instead of doing this manually.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

Most of the channels declared in the adis16400 driver look quite similar. This
patch adds a bunch of helper macros to initialize the channel spec for this
driver. This allows us to drastically reduce the number of lines of code needed
for the channel spec declaration.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

Use the triggered buffer helper functions to setup and tear down the buffer for
the adis16400 instead of doing this manually. This also means that we switch
away from the deprecated sw_ring buffer and use the kfifo buffer now instead.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

Use the new adis library for the adis16400 driver. This allows us to completely
scrap the adis16400 trigger code and more than half of the core driver code. For
now we can not make use of the generic adis buffer implementation since the
adis16400 driver has special requirements due to its burst mode support. But
we will eventually get to this.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

The chip_info struct for contains a defaul_scan_mask field. But it is never
actually used in the code, so remove it from the chip_info struct.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

The 3db divisors table is partially wrong and incomplete. Also the code rounds
up to the next higher frequency if the requested frequency would matches one of
the available frequencies. These two issues are fixed by this patch. The patch
also changes the driver to round down the filter frequency if it is larger than
the largest supported frequency instead of rejecting it as an invalid value.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

ilog2 is not defined for 0, so we need to handle the case where the requested
frequency is larger than the base sampling rate. In this case we'll round down
and set the sampling rate to the base sampling rate.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

The tsl2x7x driver has a copy'n'pasted version of the iio_str_to_fixedpoint()
function from the IIO core. Replace this custom copy and use
iio_str_to_fixedpoint instead.

The patch also introduces a slight functional change in that it makes sure that
in case of a parsing error the error is reported back to userspace instead of
silently ignoring it.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Jon Brenner <jon.brenner@ams.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

This patch implements support for sampling of a touchscreen into
the MXS LRADC driver. The LRADC block allows configuring some of
it's channels into special mode where they either output the drive
voltage or sample it, allowing it to operate a 4-wire or 5-wire
resistive touchscreen.

In case the touchscreen mode is enabled, the LRADC slot #7 is
reserved for touchscreen only, therefore it is not possible to
sample 8 LRADC channels at time, but only 7 channels.

The touchscreen controller is configured such that the PENDOWN event
disables touchscreen interrupts and triggers execution of worker
thread, which then polls the touchscreen controller for X, Y and
Pressure values. This reduces the overhead of interrupt-driven
operation. Upon the PENUP event, the worker thread re-enables the
PENDOWN detection interrupt and exits.
Signed-off-by: Marek Vasut <marex@denx.de>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

Commit a301d425 ("staging:iio:gyro remove adis16251 driver as now supported by
adis16260 driver") removed the adis16251, but left its Makefile entry intact.
This patch removes the unused Makefile entry.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

ERROR: "iio_triggered_buffer_setup" [drivers/iio/adc/max1363.ko] undefined!
ERROR: "iio_triggered_buffer_cleanup" [drivers/iio/adc/max1363.ko] undefined!

add select IIO_TRIGGERED_BUFFER

IIO_TRIGGERED_BUFFER in turn selects IIO_TRIGGER and IIO_KFIFO_BUF, so drop those
MAX1363_RING_BUFFER is not used anymore
Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

This resolves a merge issue with a iio driver, and the zram code.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

All the i/o registers used by the watchdog device on the addi-data
boards are 32-bit. Make sure all the i/o commands use outl/inl to
access the registers.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Use the addi_watchdog module to provide support for the watchdog
subdevice.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

(Almost) all comedi pci drivers have some wrapper for their
pci_driver.remove function which simply calls comedi_pci_auto_unconfig
which has the same function prototype as the wrapper.

-> we can remove these wrappers and call comedi_pci_auto_unconfig
directly. This removes a lot some boilerplate code and saves some bytes.
Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Since comedi_pci_auto_unconfig cannot be inlined anymore after
 staging/comedi: Use comedi_pci_auto_unconfig directly for
 pci_driver.remove
is applied, it makes sense to move it drivers.c
Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

The watchdog/timer subdevice in this driver is basically broke. The
subdevice functions abuse the comedi API and the (*insn_config)
simply doesn't work due to it's treating data[0] as a parameter and
not as the config "instruction".

For now, cleanup the comments for the functions so they are at least
readable. Then we can figure out how to fix the subdevice.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Create, and use, defines for the i/o registers used with the timer
subdevice.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Change the MODULE_DESCRIPTION to something more useful than the
generic "Comedi low-level driver" so that modinfo provides a
better description of the driver.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Move the copyright information from hwrdv_apci3501.c to the main
driver file. Reformat it to fix the > 80 char lines.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Currently the analog output subdevice has two support functions:
  (*insn_config) - i_APCI3501_ConfigAnalogOutput()
  (*insn_write)  - i_APCI3501_WriteAnalogOutput()

The (*insn_config) function is used to configure the analog outputs
in either bipolar or unipolar mode. This function abuses the comedi
API since it treats the data[0] value as a parameter instead of as
the config "instruction".

The (*insn_write) function then writes a single value to the desired
analog output channel after doing some sanity checking on the channel
number. The sanity checking is not required since the comedi core has
already done it. Also, the (*insn_write) functions are supposed to
write all the data, indicated by insn->n, to the channel not just a
single value.

Rewrite the support code so it works properly with the comedi API.

The bipolar/unipolar configuration can be determine in the (*insn_write)
by checking the passed insn->chanspec.

Since the unipolar configuration only has 13-bit resolution, we need
to check that the data is in range because the subdevice 'maxdata' is
set to 14-bits for the bipolar mode. If the data is out of range,
output a dev_warn() and return -EINVAL.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Rename the CamelCase local variables.

Refactor the code a bit to remove the need for some of the local
variables.

Add a couple defines to the register map to help make the code
more concise.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Refactor the code that waits for the DAC to be ready into a helper
function.

A timeout of some sort should be added to this helper so code the
users to expect the error condition. In i_APCI3501_WriteAnalogOutput()
just return the error and don't actually write the new value to the
DAC. In apci3501_reset() output a dev_warn() that the DAC was not
ready.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Move the analog output range definition from hwdrv_apci3501.c into
the main driver file.

For aesthetic reasons, rename the range table so it has namespace
associated with the driver.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Move the private struct definition and the #include of the
low-level support code to prepare for merging the code in
hwdrv_apci3501.c into the driver.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Create, and use, defines for the analog output and digital i/o
registers.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Create a struct to hold the private data still used by this driver.
This removes the last dependencies on the addi-data "common" code
so we can also remove the #include of addi_common.h.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

The addi-data "common" code always allocated 7 subdevices. This
driver only uses 5. Change the allocation and remove the unused
subdevices.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

With the eeprom support code now local to this driver, we can
remove the boardinfo since it's not necessary.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

The only value in the eeprom that is used by this driver is the
number of analog output channels.

Copy the necessary code from addi_eeprom.c to this driver and
refactor it so that we can get the value needed.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

The board supported by this driver has an on-board eeprom. Since
we need to read it to get the number of analog output channels,
expose the eeprom as a readable subdevice to the user.

Rename the i_ADDIDATA_InsnReadEeprom() function to give it namespace
associated with the driver.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

There is not need to pass the analog output subdevice information
in the boardinfo. Just initialize the subdevice directly.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

The analog outputs of this board are always 14-bit. Remove this
information from the boardinfo and just set the 'maxdata' directly
in the subdevice init. Initialize with a hex value as that is more
standard in the comedi drivers.

Since devpriv->s_EeParameters.i_AoMaxdata is not longer being used,
don't bother initializing it.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

This driver only uses PCI bar 0 and 1, don't bother reading the
unused PCI bars.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>