This patch simplifies the TS registration of mxs-lradc by
using devm_input_allocate_device.
Signed-off-by: NStefan Wahren <stefan.wahren@i2se.com>
Reviewed-by: NMarek Vasut <marex@denx.de>
Acked-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

This patch moves the STMP reset out of ADC init function so as to remove
the possiblity of an error return which will be necessary for PM ops support
patches to follow.
Signed-off-by: NStefan Wahren <stefan.wahren@i2se.com>
Tested-by: NMarek Vasut <marex@denx.de>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

This patch moves the touchscreen type configuration into
a more suitable function. Btw this simplifies PM ops later.
Signed-off-by: NStefan Wahren <stefan.wahren@i2se.com>
Reviewed-by: NMarek Vasut <marex@denx.de>
Tested-by: NMarek Vasut <marex@denx.de>
Acked-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Set INPUT_PROP_DIRECT to indicate that it is a touchscreen on the
device to help userspace classify it.
Signed-off-by: NKsenija Stanojevic <ksenija.stanojevic@gmail.com>
Acked-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Using this requires software triggers like CONFIG_IIO_HRTIMER_TRIGGER.

The device can be configured to do internal periodic sampling but does not
offer some sort of interrupt on data ready. Interrupts can only trigger when
values get out of a specific range.
Signed-off-by: NCrestez Dan Leonard <leonard.crestez@intel.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

These chips have an almost identical interface but support a different
number of value bits. Datasheet links for comparison:

 * http://www.ti.com/lit/ds/symlink/adc081c021.pdf
 * http://www.ti.com/lit/ds/symlink/adc101c021.pdf
 * http://www.ti.com/lit/ds/symlink/adc121c021.pdfSigned-off-by: NCrestez Dan Leonard <leonard.crestez@intel.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Indent lines inside if statement.
Signed-off-by: NKsenija Stanojevic <ksenija.stanojevic@gmail.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

This fixes the error reported by checkpatch.pl:

ERROR: space prohibited before that ',' (ctx:WxW)
Signed-off-by: NSlawomir Stepien <sst@poczta.fm>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

This fixes the errors reported by checkpatch.pl:

ERROR: space prohibited before that ',' (ctx:WxW)
ERROR: code indent should use tabs where possible
Signed-off-by: NSlawomir Stepien <sst@poczta.fm>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

This fixes the error reported by checkpatch.pl:

ERROR: space prohibited before that ',' (ctx:WxW)
Signed-off-by: NSlawomir Stepien <sst@poczta.fm>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

This fixes the error reported by checkpatch.pl:

ERROR: switch and case should be at the same indent
Signed-off-by: NSlawomir Stepien <sst@poczta.fm>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

The scale would result in uV instead of expected mV.
Mostly cosmetic, since the value of 'Power' was computed OK.
Signed-off-by: NMarc Titinger <marc.titinger@baylibre.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Add signed differential channels and update the voltage scale for
differential conversions.
Signed-off-by: NLudovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Do not erase previous configuration of the mode register when setting
the sampling frequency.
Signed-off-by: NLudovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

The user (or an init script) may setup RShunt via sysfs after the
driver was initialized, for instance based on the EEPROM contents
of a modular probe. The calibration register must be set accordingly.
Signed-off-by: NMarc Titinger <marc.titinger@baylibre.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

The ADC is a 6-channel signal-ended 10-bit Successive
Approximation Register (SAR) A/D Converter.
Signed-off-by: NDavid Wu <david.wu@rock-chips.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Add base support for the 10-bit SAR ADC peripheral found
on NXP LPC18xx/43xx SoCs.

This is a minimal driver that does not support burst mode,
interrupts, DMA or hardware triggers.

User manual with register description can be found on:
LPC18xx: www.nxp.com/documents/user_manual/UM10430.pdf
LPC43xx: www.nxp.com/documents/user_manual/UM10503.pdf
Signed-off-by: NJoachim Eastwood <manabian@gmail.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

The newly added driver uses do_div() to device a 32-bit number, which now
provokes a warning:

drivers/iio/adc/fsl-imx25-gcq.c: In function 'mx25_gcq_setup_cfgs':
include/asm-generic/div64.h:207:28: warning: comparison of distinct pointer types lacks a cast
  (void)(((typeof((n)) *)0) == ((uint64_t *)0)); \

This replaces the do_div() call with a straight division operator.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Fixes: 6df2e98c ("iio: adc: Add imx25-gcq ADC driver")
Signed-off-by: NLee Jones <lee.jones@linaro.org>

The devres.o gets linked if HAS_IOMEM is present so on ARCH=um
allyesconfig (COMPILE_TEST) failed with:

drivers/built-in.o: In function `at91_adc_probe':
at91-sama5d2_adc.c:(.text+0x48f548): undefined reference to `devm_ioremap_resource'
Signed-off-by: NKrzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Remove some extra tabs.
Signed-off-by: NLudovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Fix typo in the name of a macro.
Signed-off-by: NLudovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Palmas gpadc IRQs are nested threaded and this flag is not required for nested
irqs anymore, since commit 3c646f2c ("genirq: Don't suspend nested_thread
irqs over system suspend") was merged.

Cc: Hartmut Knaack <knaack.h@gmx.de>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Peter Meerwald <pmeerw@pmeerw.net>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Nishanth Menon <nm@ti.com>
Signed-off-by: NGrygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Previously most drivers that used a i2c_check_functionality() check
condition required various error codes on failure. This patchset
converts to a standard of -EOPNOTSUPP
Signed-off-by: NMatt Ranostay <mranostay@gmail.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

These are generally for devlopment use only, remove these
from performance-critical code, convert to dev_dbg elswhere.
Signed-off-by: NAndrew F. Davis <afd@ti.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Group of probably overly rigorous whitespace and code cleanups.
 - Alphabetize includes
 - Assign to variables in the order they are defined
 - Alignment issues
 - Group alike statements together
 - Use helper macros
Signed-off-by: NAndrew F. Davis <afd@ti.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

The driver has sysfs readings with runtime PM support for power saving.
It also offers buffer support that can be used together with IIO software
triggers.

Datasheet can be found here:
	http://www.ti.com.cn/cn/lit/ds/symlink/ads1015.pdfSigned-off-by: NDaniel Baluta <daniel.baluta@intel.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

This is a conversion queue driver for the mx25 SoC. It uses the central
ADC which is used by two seperate independent queues. This driver
prepares different conversion configurations for each possible input.
For a conversion it creates a conversionqueue of one item with the
correct configuration for the chosen channel. It then executes the queue
once and disables the conversion queue afterwards.

The reference voltages are configurable through devicetree subnodes,
depending on the connections of the ADC inputs.
Signed-off-by: NMarkus Pargmann <mpa@pengutronix.de>
Signed-off-by: NDenis Carikli <denis@eukrea.com>
Acked-by: NJonathan Cameron <jic23@kernel.org>
Signed-off-by: NLee Jones <lee.jones@linaro.org>

Move mxs-lradc driver from drivers/staging/iio/adc to drivers/iio/adc.
Signed-off-by: NKsenija Stanojevic <ksenija.stanojevic@gmail.com>
Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

This adds ADC0831/ADC0832/ADC0834/ADC0838 8-bit ADC driver.
I have tested with ADC0831 and ADC0832.  The remaining ADC0834 and
ADC0838 are very similar to ADC0832.
Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Hartmut Knaack <knaack.h@gmx.de>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Peter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Not every arch has io memory.
So, unbreak the build by fixing the dependencies.
Signed-off-by: NRichard Weinberger <richard@nod.at>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

duplicate const can be removed, it is redundant. Found by static
analysis using smatch.
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Use var type for sizeof argument instead of the struct name.
Signed-off-by: NLudovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

vref_uv has to be an int.
Signed-off-by: NLudovic Desroches <ludovic.desroches@atmel.com>
Reported-by: NJulia Lawall <julia.lawall@lip6.fr>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Whilst this part has a hardware buffer, the identifcation that IIO cares
about is the userspace facing end.  It this case we push individual elements
from the hardware fifo into the software interface (specifically a kfifo)
rather than providing direct reads through to a hardware buffer
(as we still do in the sca3000 for example).

Technically the original specification as a hardware buffer could be
considered wrong, but it didn't matter until the patch listed below.

Result is that any attempt to enable the buffer will return -EINVAL

Fixes: 225d59ad ("iio: Specify supported modes for buffers")
Cc: <Stable@vger.kernel.org>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

mcp320x driver supports the pseudo-differential mode by
in_voltage'IN+'-voltage'IN-'_raw where (IN+, IN-) = (0, 1), (2, 3), ...

mcp320x chips except MCP3X01 can also select swapped IN+ and IN-
pairs in the pseudo-differential mode.
i.e. in_voltage'IN+'-voltage'IN-'_raw where (IN+, IN-) = (1, 0),
(3, 2), ...

If the voltage level of IN+ is equal to or less than IN-, the
resultant code will be 000h.  So it is useful to provide these, too.
Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com>
Cc: Oskar Andero <oskar.andero@gmail.com>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Hartmut Knaack <knaack.h@gmx.de>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Peter Meerwald <pmeerw@pmeerw.net>
Cc: linux-iio@vger.kernel.org
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Signed-off-by: NLudovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

This driver supports the new version of the Atmel ADC device introduced
with the SAMA5D2 SoC family.
Signed-off-by: NLudovic Desroches <ludovic.desroches@atmel.com>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Ran into this on UML:

drivers/built-in.o: In function `vf610_adc_probe':
drivers/iio/adc/vf610_adc.c:744: undefined reference to `devm_ioremap_resource'

devm_ioremap_resource() is defined only when HAS_IOMEM is selected.
Signed-off-by: NVegard Nossum <vegard.nossum@oracle.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

The MCP3425 is a single channel up to 16-bit A/D converter which has
features:

- On-Board Programmable Gain Amplifier (PGA):
 - Gains of 1, 2, 4 or 8
- Programmable Data Rate Options:
 - 15 SPS (16 bits), 60 SPS (14 bits), 240 SPS (12 bits)

The mcp3422 driver also supports the MCP3421 which is a single channel.
So we can support MCP3425 with a little changes to mcp3422 driver.
Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Angelo Compagnucci <angelo.compagnucci@gmail.com>
Cc: Peter Meerwald <pmeerw@pmeerw.net>
Cc: linux-iio@vger.kernel.org
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

This was extracted from a reposting of the driver after it had been applied
to the IIO tree.  I have fast tracked it as the driver will be in 4.5 and
it would be nice to fix this trivial issue before it is.
Signed-off-by: NJonathan Cameron <jic23@kernel.org>