Update the doc as the SAR ADC modules doesn't require "sana" clock.
Singed-off-by: NXingyu Chen <xingyu.chen@amlogic.com>
Signed-off-by: NYixun Lan <yixun.lan@amlogic.com>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

The "sana" clock is not used at SAR ADC module in Amlogic Meson SoC,
it is irrelevant for the SAR ADC.
Signed-off-by: NXingyu Chen <xingyu.chen@amlogic.com>
Signed-off-by: NYixun Lan <yixun.lan@amlogic.com>
Reviewed-by: NMartin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

Pointer pdata is being assigned but it is never being used, hence
it is redundant and can be removed. Cleans up clang warning:

drivers/iio/accel/st_accel_core.c:952:3: warning: Value stored to 'pdata'
is never read
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

This adds an ACPI table to the driver and the ACPI ID of the sensor
on the tablet.
Signed-off-by: NLuke Ross <luke@lukeross.name>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NLorenzo Bianconi <lorenzo.bianconi83@gmail.com>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

add support for STMicroelectronics UVIS25 uv sensor
http://www.st.com/resource/en/datasheet/uvis25.pdf

- continuos mode support
- i2c support
- spi support
- trigger mode support
- system PM support
Signed-off-by: NLorenzo Bianconi <lorenzo.bianconi83@gmail.com>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Michael Hennerich <Michael.Hennerich@analog.com>
Cc: Andreas Klinger <ak@it-klinger.de>
Cc: Hartmut Knaack <knaack.h@gmx.de>
Cc: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Signed-off-by: NLukas Wunner <lukas@wunner.de>
Acked-by: NWilliam Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

The ASPEED SoC must deassert a reset in order to use the ADC peripheral.

The device tree bindings are updated to document the resets phandle, and
the example is updated to match what is expected for both the reset and
clock phandle. Note that the bindings should have always had the reset
controller, as the hardware is unusable without it.
Signed-off-by: NJoel Stanley <joel@jms.id.au>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

Signed-off-by: NPeter Meerwald-Stadler <pmeerw@pmeerw.net>
Acked-by: NMatt Ranostay <matt.ranostay@konsulko.com>
Cc: Rob Herring <robh+dt@kernel.org>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

The Maxim MAX30105 part adds a third LED (green) and uses a multi-LED
measuring mode producing three measurements
Signed-off-by: NPeter Meerwald-Stadler <pmeerw@pmeerw.net>
Acked-by: NMatt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

Current code assumes always 2 measurements (6 bytes) have to be copied,
prepare for more flexibility
Signed-off-by: NPeter Meerwald-Stadler <pmeerw@pmeerw.net>
Acked-by: NMatt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

Move the programming of the mode setting from init() to
buffer_postenable()

Split out a separate function to
only update the power/shutdown bit

This changes permits to more easily implement different
modes of measurements in further patches
Signed-off-by: NPeter Meerwald-Stadler <pmeerw@pmeerw.net>
Acked-by: NMatt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

Signed-off-by: NPeter Meerwald-Stadler <pmeerw@pmeerw.net>
Acked-by: NMatt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

Chip must not be in shutdown for reading temperature, so briefly leave
shutdown if buffer is not already running
Signed-off-by: NPeter Meerwald-Stadler <pmeerw@pmeerw.net>
Acked-by: NMatt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

Signed-off-by: NPeter Meerwald-Stalder <pmeerw@pmeerw.net>
Acked-by: NMatt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

Signed-off-by: NPeter Meerwald-Stadler <pmeerw@pmeerw.net>
Acked-by: NMatt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

Signed-off-by: NPeter Meerwald-Stadler <pmeerw@pmeerw.net>
Acked-by: NMatt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

Table 4 of the datasheet specifies the mode control, these are not
individual bits; add multi LED mode

Add multi-LED mode and fix MODE_MASK (3 bits wide, not 2)
Signed-off-by: NPeter Meerwald-Stadler <pmeerw@pmeerw.net>
Acked-by: NMatt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

Signed-off-by: NPeter Meerwald-Stadler <pmeerw@pmeerw.net>
Acked-by: NMatt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

Signed-off-by: NPeter Meerwald-Stadler <pmeerw@pmeerw.net>
Acked-by: NMatt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

STM32H7 ADC channels can be configured either as single ended or
differential with 'st,adc-channels' or 'st,adc-diff-channels'
(positive and negative input pair: <vinp vinn>, ...).

Differential channels have different offset and scale, from spec:
raw value = (full_scale / 2) * (1 + (vinp - vinn) / vref).
Add offset attribute.

Differential channels are selected by DIFSEL register. Negative
inputs must be added to pre-selected channels as well (PCSEL).
Signed-off-by: NFabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

Remove const array that defines channels. Build channels definition
at probe time, when initializing channels (only for requested ones).
This will ease adding differential channels support.
Signed-off-by: NFabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

STM32H7 ADC channels may be configured either as single-ended or
differential.
Add 'st,adc-diff-channels' property to support differential channels.
Differential channels are defined as a pair of positive and negative
inputs: vinp & vinn.
Signed-off-by: NFabrice Gasnier <fabrice.gasnier@st.com>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

Reducing shunt and bus voltage range improves the accuracy, so allow
altering the default settings.

Both settings are exposed as gain values. While for the shunt voltage
this is straightforward, the bus range settings of 32V (default) and 16V
are mapped to gain values of 1 resp. 2, to provide a uniform API to
userspace.

As the gain settings are incorporated into the raw values by the sensor
itself, adjusting of the scale attributes is not necessary.
Signed-off-by: NStefan Brüns <stefan.bruens@rwth-aachen.de>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

While the config uses the physical value corresponding to the LSB
for both the power and the bus voltage register, the shunt voltage is
specified as parts of 1 mV. Use the LSB physical value for all registers.

No functional change.
Signed-off-by: NStefan Brüns <stefan.bruens@rwth-aachen.de>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

Lower bits of the INA219/220 bus voltage register are conversion
status flags, properly shift the value.

When reading via IIO buffer, the value is passed on unaltered,
shifting is the responsibility of the user.
Signed-off-by: NStefan Brüns <stefan.bruens@rwth-aachen.de>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

Since i2c_unregister_device() became NULL-aware we may remove duplicate
NULL check.

Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Hartmut Knaack <knaack.h@gmx.de>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Cc: linux-iio@vger.kernel.org
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

* Add a jump target so that a call of the function "mutex_unlock" is stored
  only twice in this function implementation.

* Replace two calls by goto statements.

This issue was detected by using the Coccinelle software.
Signed-off-by: NMarkus Elfring <elfring@users.sourceforge.net>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

* Add a jump target so that a call of the function "mutex_unlock" is stored
  only twice in this function implementation.

* Replace two calls by goto statements.

This issue was detected by using the Coccinelle software.
Signed-off-by: NMarkus Elfring <elfring@users.sourceforge.net>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

Add new ACPI ID for ak9911 as had been found on prototype board.
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

Add new ACPI ID for sx9500 as had been found on prototype board.
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

Rename structs holding event configuration registers
to more appropriate names. This naming is consistent
with the event config register names given in the
mma845x and fxls8471 datasheets.
Signed-off-by: NHarinath Nampally <harinath922@gmail.com>
Acked-by: NMartin Kepplinger <martink@posteo.de>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

Rename time step look up struct to generic name
as the values in the look table are same for all
the other events like pulse, transient etc.
Signed-off-by: NHarinath Nampally <harinath922@gmail.com>
Acked-by: NMartin Kepplinger <martink@posteo.de>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

Signed-off-by: NPeter Meerwald-Stadler <pmeerw@pmeerw.net>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

Driver for 20-bit ALS and UV B sensor with I2C interface exposing
the following API:
  in_uvindex_input
  in_illuminance_raw
  in_illuminance_scale
  in_illuminance_scale_available
  in_intensity_uv_raw
  in_intensity_uv_scale
  in_intensity_uv_scale_available
  integration_time
  integration_time_available
Signed-off-by: NPeter Meerwald-Stadler <pmeerw@pmeerw.net>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

In preparation to enabling -Wimplicit-fallthrough, mark switch cases
where we are expecting to fall through.

Addresses-Coverity-ID: 1397962
Signed-off-by: NGustavo A. R. Silva <garsilva@embeddedor.com>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

Fix gcc warnings about variable 'ec_device' being set but not used
in these files:
common/cros_ec_sensors/cros_ec_sensors.c:194:25
light/cros_ec_light_prox.c:184:25
Signed-off-by: NPaolo Cretaro <paolocretaro@gmail.com>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

Need to acknowledge DRDY irq in direct mode/ software
triggered mode. Otherwise, on the next conversion, overrun
flag will be raised, which is not a correct state.
This doesn't affect the functionality, but will generate
possible incorrect overrun reports.
Signed-off-by: NEugen Hristev <eugen.hristev@microchip.com>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

Added support for DMA transfers. The implementation uses the user watermark
to decide whether DMA will be used or not. For watermark 1, DMA will not be
used. If watermark is bigger, DMA will be used.
Sysfs attributes are created to indicate whether the DMA is used,
with hwfifo_enabled, and the current DMA watermark is readable
in hwfifo_watermark. Minimum and maximum values are in hwfifo_watermark_min
and hwfifo_watermark_max.
Signed-off-by: NEugen Hristev <eugen.hristev@microchip.com>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

Added property for DMA configuration of the device.
Signed-off-by: NEugen Hristev <eugen.hristev@microchip.com>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>