This adds support for Microchip's 12 bit AD converters MCP3204 and
MCP3208. These chips communicates over SPI and supports single-ended
and pseudo-differential configurations.
Signed-off-by: NOskar Andero <oskar.andero@gmail.com>
Reviewed-by: NLars-Peter Clausen <lars@metafoo.de>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

On the at91_adc a minimal Sample and Hold Time is necessary for the ADC to
guarantee the best converted final value between two channels selection.
This time has to be programmed through the bitfield SHTIM in the
Mode Register ADC_MR.
Signed-off-by: NJean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: NLudovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

The sleep mode will allow to put the adc in sleep between conversion.
Signed-off-by: NJean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: NLudovic Desroches <ludovic.desroches@atmel.com>
Acked-by: NMaxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

at91 adc offers the choice between two resolutions: low and high.
The low and high resolution values depends on adc IP version, as many IP
properties have been exposed through device tree, these settings have also
been added to the dt bindings.
Signed-off-by: NLudovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: NJean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Issues raised in last series to propose this have now been resolved
so there should be no reason this driver cannot graduate from staging.
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
Acked-by: NLaxman Dewangan <ldewangan@nvidia.com>

exynos_adc is a DT only driver and exynos_adc_match table is always
compiled in. Hence remove the macro.
Signed-off-by: NSachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Introduce iio_tigger_{set,get}_drvdata which allows to attach driver specific
data to a trigger. The functions wrap access to the triggers private_data field
and all current users are updated to use iio_tigger_{set,get}_drvdata instead of
directly accessing the private_data field. This is the first step towards
removing the private_data field from the iio_trigger struct.

The following coccinelle script has been used to update the drivers:
<smpl>
@@
struct iio_trigger *trigger;
expression priv;
@@
-trigger->private_data = priv
+iio_trigger_set_drv_data(trigger, priv)

@@
struct iio_trigger *trigger;
@@
-trigger->private_data
+iio_trigger_get_drv_data(trigger)
</smpl>
Signed-off-by: NLars-Peter Clausen <lars@metafoo.de>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Without this change the exynos adc controller needed to have its phy
enabled in some out-of-driver C code.  Add support for specifying the
phy enable register by listing it in the reg list.
Signed-off-by: NDoug Anderson <dianders@chromium.org>
Tested-by: NNaveen Krishna Chatradhi <ch.naveen@samsung.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

The ad7924 is software compatible with the ad7923. The ad7904 and ad7914 are the
8 and 10 bit version of the ad7924.

While we are at it also drop the "with temperature sensor" from the Kconfig
entry, since the chips do not have a temperature sensor.
Signed-off-by: NLars-Peter Clausen <lars@metafoo.de>
Cc: Patrick Vasseur <patrick.vasseur@c-s.fr>
Cc: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

The driver already claims to support scale reporting in its channel spec, but
doesn't actually implement this yet. This patch uses the regulator API to get
the reference voltage and calculates the scale based on that. The patch also
moves the global configuration bits into a field in the ad7923_state struct,
since depending on the RANGE bit, the range goes either from 0 to VREF or from 0
to 2 * VREF. So we need to know the setting of the RANGE bit when calculating
the scale.
Signed-off-by: NLars-Peter Clausen <lars@metafoo.de>
Cc: Patrick Vasseur <patrick.vasseur@c-s.fr>
Cc: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Instead of leaving 'val' uninitialized return an error if the result's address
did not match that of the channel we were trying to read.
Signed-off-by: NLars-Peter Clausen <lars@metafoo.de>
Cc: Patrick Vasseur <patrick.vasseur@c-s.fr>
Cc: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Signed-off-by: NGe Gao <ggao@invensense.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

As the exynos_adc driver only supports device tree registration.
Making driver depend on CONFIG_OF solves possible errors during probe.
Signed-off-by: NNaveen Krishna Chatradhi <ch.naveen@samsung.com>
Reported-by: NDan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: NDoug Anderson <dianders@chromium.org>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Currently it is not save to call iio_push_event() from hard IRQ context since
the IIO event code uses spin_lock()/spin_unlock() and it is not save to mix
calls to spin_lock()/spin_unlock() from different contexts on the same lock.
E.g. if the lock is being held in iio_event_chrdev_read() and an interrupts
kicks in and the interrupt handler calls iio_push_event() we end uo with a
deadlock.

This patch updates iio_push_event() to use spin_lock_irqsave()/
spin_unlock_irqstrestore(), since it can be called from both IRQ and non-IRQ
context. All other other users of the lock, which are always run in non-IRQ
context, are updated to spin_lock_irq()/spin_unlock_irq().
Signed-off-by: NLars-Peter Clausen <lars@metafoo.de>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

This has been replaced by the pair of masks info_mask_separate
and info_mask_shared_by_type.  Other variants may follow.
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
Acked-by: NLars-Peter Clausen <lars@metafoo.de>

The original info_mask is going away in favour of the broken out versions.
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
Acked-by: NLars-Peter Clausen <lars@metafoo.de>
cc: Patrick Vasseur <patrick.vasseur@c-s.fr>
cc: Christophe Leroy <christophe.leroy@c-s.fr>

The original info_mask is going away in favour of the broken out versions.
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
Acked-by: NNaveen Krishna Chatradhi <ch.naveen@samsung.com>

The original info_mask is going away in favour of the broken out versions.
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
cc: Peter Meerwald <pmeerw@pmeerw.net>

The original info_mask is going away in favour of the broken out versions.
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
cc: Jon Brenner <jbrenner@taosinc.com>

The original info_mask is going away in favour of the broken out versions.
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
cc: Johan Hovold <jhovold@gmail.com>

The original info_mask is going away in favour of the broken out versions.
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
cc: Peter Meerwald <pmeerw@pmeerw.net>

The original info_mask is going away in favour of the broken out versions.
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
cc: Ge Gao <ggao@invensense.com>

The original info_mask is going away in favour of the broken out versions.
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
Acked-by: NLars-Peter Clausen <lars@metafoo.de>

The original info_mask is going away in favour of the broken out versions.
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
Acked-by: NLars-Peter Clausen <lars@metafoo.de>

The original info_mask is going away in favour of the broken out versions.
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
cc: Manuel Stahl <manuel.stahl@iis.fraunhofer.de>

The original info_mask is going away in favour of the broken out versions.
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
Acked-by: NLars-Peter Clausen <lars@metafoo.de>

The original info_mask is going away in favour of the broken out versions.
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
Acked-by: NLars-Peter Clausen <lars@metafoo.de>

The original info_mask is going away in favour of the broken out versions.
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
Acked-by: NLars-Peter Clausen <lars@metafoo.de>

The original info_mask is going away in favour of the broken out versions.
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
Acked-by: NLars-Peter Clausen <lars@metafoo.de>

The original info_mask is going away in favour of the broken out versions.
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
cc: Peter Meerwald <pmeerw@pmeerw.net>

The original info_mask is going away in favour of the broken out versions.
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
cc: Roland Stigge <stigge@antcom.de>

The original info_mask is going away in favour of the broken out versions.
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
Acked-by: NLars-Peter Clausen <lars@metafoo.de>

The original info_mask is going away in favour of the broken out versions.
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
Acked-by: NLars-Peter Clausen <lars@metafoo.de>

The original info_mask is going away in favour of the broken out versions.
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
Acked-by: NLars-Peter Clausen <lars@metafoo.de>

The original info_mask is going away in favour of the broken out versions.
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
Acked-by: NLars-Peter Clausen <lars@metafoo.de>

The original info_mask is going away in favour of the broken out versions.
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
Acked-by: NLars-Peter Clausen <lars@metafoo.de>

The original info_mask is going away in favour of the broken out versions.
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
Acked-by: NLars-Peter Clausen <lars@metafoo.de>

The original info_mask is going away in favour of the broken out versions.
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
Acked-by: NLars-Peter Clausen <lars@metafoo.de>

The original info_mask is going away in favour of the broken out versions.
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
Acked-by: NLars-Peter Clausen <lars@metafoo.de>

The original info_mask is going away in favour of the broken out versions.
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
Acked-by: NLars-Peter Clausen <lars@metafoo.de>