Add support for Microchip digital potentiometers and rheostats
MCP4017, MCP4018, MCP4019
They all have one wiper with 128 steps and come in 5, 10, 50 and 100 kOhm
variations.
Datasheet: http://www.microchip.com/downloads/en/DeviceDoc/22147a.pdf
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
In preparation to enabling -Wvla, remove VLA usage and replace it
with fixed a fixed length array and therefore, prevent potential
stack overflow attacks.
Fixed as a part of the discussion to remove all VLAs from the kernel:
https://lkml.org/lkml/2018/3/7/621
Cc: keescook@chromium.org
Signed-off-by: Himanshu Jha <himanshujha199640@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Usually, functions responsible for reading raw data typically relies on
values from iio_chan_info_enum to correctly identify the type of data to
be read. There is a set of a device driver that uses the magic number 0
instead of IIO_CHAN_INFO_RAW. This patch improves the readability by
replaces the magic number 0 for the appropriate IIO_CHAN_INFO_RAW in six
devices driver in the IIO subsystem.
Signed-off-by: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
The function magn_3d_read_raw has a switch statement handling multiple
cases per channel. The first case statement uses the magic number 0,
which means IIO_CHAN_INFO_RAW. Additionally, the iio_chan_spec for
magn_3d_channels is configured to be IIO_CHAN_INFO_RAW. Therefore, this
patch replaces the magic number 0 for the appropriate IIO_CHAN_INFO_RAW.
Signed-off-by: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This patch fixes the checkpatch.pl warning:
drivers/iio/dummy/Kconfig:21: WARNING: please write a paragraph that
describes the config symbol fully
drivers/iio/dummy/Kconfig:27: WARNING: please write a paragraph that
describes the config symbol fully
This patch expands the explanation about IIO_DUMMY_EVGEN by using the
code documentation found in iio/dummy/iio_dummy_evgen.c. In the same
way, the information related to IIO_SIMPLE_DUMMY_BUFFER was extracted
from file iio_simple_dummy_buffer.c.
Signed-off-by: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
Reviewed-by: Daniel Baluta <daniel.baluta@nxp.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Kconfig from iio/dummy does not follow the coding style recommendations.
According to the coding-style, Lines under a config definition are
indented with one tab, while help text is indented an additional two
spaces. This patch adds the proper tabulation and space.
Signed-off-by: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
Reviewed-by: Daniel Baluta <daniel.baluta@nxp.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This patch adds support for the On Semiconductor LV0104CS ambient
light sensor.
Signed-off-by: Jeff LaBundy <jeff@labundy.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
In order to satisfy GPIO ACPI library requirements convert users of
gpiod_get_index() to correctly behave when there no mapping is provided
by firmware.
Here we add explicit mapping between _CRS GpioIo() resources and
their names used in the driver.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
If an application set a tight sampling frequency, given the interrupt
use is a wakeup source, suspend will not happen: the kernel will receive
a wake up interrupt and will cancel the suspend process.
Given cros_ec sensors type is non wake up, this patch adds prepare and
complete callbacks to set 1s sampling period just before suspend. This
ensures the sensor hub will not be a source of interrupt during the
suspend process.
Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This shouldn't affect runtime at all, but Smatch complains that we
should check if mlx90632_read_ambient_raw() otherwise we
"ambient_new_raw" can be uninitialized.
drivers/iio/temperature/mlx90632.c:509 mlx90632_calc_ambient_dsp105()
error: uninitialized symbol 'ambient_new_raw'.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Crt Mori <cmo@melexis.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Dynamic debug has a run time knob to enable function name printing.
Remove this from dev_dbg() calls.
Furthermore, functional tracing when enabled can show what function is
called, therefore remove empty dev_dbg() calls.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
!!'s behaviour isn't that obvious and sparse complained about it, so
let's replace it with a ternary condition.
Signed-off-by: Quentin Schulz <quentin.schulz@bootlin.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
The resistance member in ccs811_reading struct is an unsigned 16-bit
integer variable used to store RAW_DATA register bytes read from CCS811.
It is kind of misleading to name this struct member as resistance.
About the RAW_DATA register bytes, the CCS811 datasheet states that:
-----
Two byte read only register which contains the latest readings from the
sense resistor.
The most significant 6 bits of the Byte 0 contain the value of the current
through the sensor (0μA to 63μA).
The lower 10 bits contain (as computed from the ADC) the readings of the
voltage across the sensor with the selected current (1023 = 1.65V)"
-----
Hence, the RAW_DATA register byte contains information about electric
current and voltage of the CCS811 sensor. Calling this struct member
'resistance' is kind of misleading, although both electric current and
voltage are needed to calculate the electrical resistance of the sensor
using Ohm's law, V = I x R, in which a new channel type of IIO_RESISTANCE
may be added to the driver in the future.
Signed-off-by: Richard Lai <richard@richardman.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Outside of IIO
* Strongly typed 64bit int_sqrt function needed by the mlx90632
New device support
* adc081s
- New driver supporting adc081s, adc101s and adc121s TI ADCs.
* ad5272
- New driver supproting the ad5272 and ad5274 ADI digital potentiometers
with DT bindings.
* axp20x_adc
- support the AXP813 ADC - includes rework patches to prepare for this.
* mlx90632
- New driver with dt bindings for this IR temperature sensor.
Features
* axp20x_adc
- Add DT bindings and probing.
* dht11
- The sensor has a wider range than advertised in the datasheet - support it.
* st_lsm6dsx
- Add hardware timestamp su9pport.
Cleanups
* ABI docs
- Update email contact for Matt Ranostay
* SPDX changes
- Matt Ranostay has moved his drivers over to SPDX. Currently we are making
this an author choice in IIO.
* ad7192
- Disable burnout current on misconfiguration. No actually effect as
they simply won't work otherwise.
* ad7476
- Drop a license definition that was replicating information in SPDX tag.
* ade7758
- Expand buf_lock to cover both buffer and state protection allowing
unintented uses of mlock in the core to be removed.
* ade7759
- Align parameters to opening parenthesis.
* at91_adc
- Depend on sysfs instead of selecting it - for try wide consistency.
* ccs811
- trivial naming type for a define.
* ep93xx
- Drop a redundant return as a result checking platform_get_resource.
* hts221
- Regmap conversion which simplifies the driver somewhat.
- Clean up some restricted endian cast warnings.
- Drop a trailing whitespace from a comment
- Drop an unnecessary get_unaligned by changing to the right 16bit data type.
* ms5611
- Fix coding style in the probe function (whitespace)
* st_accel
- Use strlcpy instead of strncpy to avoid potentially truncating a string.
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Merge tag 'iio-for-4.17a' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into staging-next
Jonathan writes:
First round of new devices, features and cleanups for IIO in the 4.17 cycle.
Outside of IIO
* Strongly typed 64bit int_sqrt function needed by the mlx90632
New device support
* adc081s
- New driver supporting adc081s, adc101s and adc121s TI ADCs.
* ad5272
- New driver supproting the ad5272 and ad5274 ADI digital potentiometers
with DT bindings.
* axp20x_adc
- support the AXP813 ADC - includes rework patches to prepare for this.
* mlx90632
- New driver with dt bindings for this IR temperature sensor.
Features
* axp20x_adc
- Add DT bindings and probing.
* dht11
- The sensor has a wider range than advertised in the datasheet - support it.
* st_lsm6dsx
- Add hardware timestamp su9pport.
Cleanups
* ABI docs
- Update email contact for Matt Ranostay
* SPDX changes
- Matt Ranostay has moved his drivers over to SPDX. Currently we are making
this an author choice in IIO.
* ad7192
- Disable burnout current on misconfiguration. No actually effect as
they simply won't work otherwise.
* ad7476
- Drop a license definition that was replicating information in SPDX tag.
* ade7758
- Expand buf_lock to cover both buffer and state protection allowing
unintented uses of mlock in the core to be removed.
* ade7759
- Align parameters to opening parenthesis.
* at91_adc
- Depend on sysfs instead of selecting it - for try wide consistency.
* ccs811
- trivial naming type for a define.
* ep93xx
- Drop a redundant return as a result checking platform_get_resource.
* hts221
- Regmap conversion which simplifies the driver somewhat.
- Clean up some restricted endian cast warnings.
- Drop a trailing whitespace from a comment
- Drop an unnecessary get_unaligned by changing to the right 16bit data type.
* ms5611
- Fix coding style in the probe function (whitespace)
* st_accel
- Use strlcpy instead of strncpy to avoid potentially truncating a string.
Add GPLv2+ SPDX identifier and update email for author's drivers.
Signed-off-by: Matt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This particular constant was named with prefix "CCS881", which should be
"CCS811" instead, just like the rest of constant names in the file, as this
driver implementation is for AMS CCS811 sensor. "CCS881" could literally be
referring to another sensor product unrelated to AMS CCS811 sensor.
Signed-off-by: Richard Lai <richard@richardman.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This patch fixes the checkpatch.pl warning and error:
iio/pressure/ms5611.h:66: ERROR: code indent should use tabs where possible
iio/pressure/ms5611.h:66: WARNING: please, no spaces at the start of a line
iio/pressure/ms5611.h:66: ERROR: "foo* bar" should be "foo *bar"
Signed-off-by: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
The old code was based on a DHT11 datasheet which specifies a measurement
range of 20%-90% RH. Turns out the sensor actually reports values outside
this range, so we should support it as far as possible.
Reported-by: Edward Attfield <edward@attfield.ca>
Signed-off-by: Harald Geyer <harald@ccbib.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This is the mindless scripted replacement of kernel use of POLL*
variables as described by Al, done by this script:
for V in IN OUT PRI ERR RDNORM RDBAND WRNORM WRBAND HUP RDHUP NVAL MSG; do
L=`git grep -l -w POLL$V | grep -v '^t' | grep -v /um/ | grep -v '^sa' | grep -v '/poll.h$'|grep -v '^D'`
for f in $L; do sed -i "-es/^\([^\"]*\)\(\<POLL$V\>\)/\\1E\\2/" $f; done
done
with de-mangling cleanups yet to come.
NOTE! On almost all architectures, the EPOLL* constants have the same
values as the POLL* constants do. But they keyword here is "almost".
For various bad reasons they aren't the same, and epoll() doesn't
actually work quite correctly in some cases due to this on Sparc et al.
The next patch from Al will sort out the final differences, and we
should be all done.
Scripted-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Add implementation for Analog Devices AD5272 and AD5274 digital
potentiometer devices.
Signed-off-by: Phil Reid <preid@electromag.com.au>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Melexis has just released Infra Red temperature sensor MLX90632 used
for contact-less temperature measurement. Driver provides basic
functionality for reporting object (and ambient) temperature with
support for object emissivity.
Signed-off-by: Crt Mori <cmo@melexis.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Here is the big Staging and IIO driver patches for 4.16-rc1.
There is the normal amount of new IIO drivers added, like all releases.
The networking IPX and the ncpfs filesystem are moved into the staging
tree, as they are on their way out of the kernel due to lack of use
anymore.
The visorbus subsystem finall has started moving out of the staging tree
to the "real" part of the kernel, and the most and fsl-mc codebases are
almost ready to move out, that will probably happen for 4.17-rc1 if all
goes well.
Other than that, there is a bunch of license header cleanups in the
tree, along with the normal amount of coding style churn that we all
know and love for this codebase. I also got frustrated at the
Meltdown/Spectre mess and took it out on the dgnc tty driver, deleting
huge chunks of it that were never even being used.
Full details of everything is in the shortlog.
All of these patches have been in linux-next for a while with no
reported issues.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'staging-4.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging
Pull staging/IIO updates from Greg KH:
"Here is the big Staging and IIO driver patches for 4.16-rc1.
There is the normal amount of new IIO drivers added, like all
releases.
The networking IPX and the ncpfs filesystem are moved into the staging
tree, as they are on their way out of the kernel due to lack of use
anymore.
The visorbus subsystem finall has started moving out of the staging
tree to the "real" part of the kernel, and the most and fsl-mc
codebases are almost ready to move out, that will probably happen for
4.17-rc1 if all goes well.
Other than that, there is a bunch of license header cleanups in the
tree, along with the normal amount of coding style churn that we all
know and love for this codebase. I also got frustrated at the
Meltdown/Spectre mess and took it out on the dgnc tty driver, deleting
huge chunks of it that were never even being used.
Full details of everything is in the shortlog.
All of these patches have been in linux-next for a while with no
reported issues"
* tag 'staging-4.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging: (627 commits)
staging: rtlwifi: remove redundant initialization of 'cfg_cmd'
staging: rtl8723bs: remove a couple of redundant initializations
staging: comedi: reformat lines to 80 chars or less
staging: lustre: separate a connection destroy from free struct kib_conn
Staging: rtl8723bs: Use !x instead of NULL comparison
Staging: rtl8723bs: Remove dead code
Staging: rtl8723bs: Change names to conform to the kernel code
staging: ccree: Fix missing blank line after declaration
staging: rtl8188eu: remove redundant initialization of 'pwrcfgcmd'
staging: rtlwifi: remove unused RTLHALMAC_ST and RTLPHYDM_ST
staging: fbtft: remove unused FB_TFT_SSD1325 kconfig
staging: comedi: dt2811: remove redundant initialization of 'ns'
staging: wilc1000: fix alignments to match open parenthesis
staging: wilc1000: removed unnecessary defined enums typedef
staging: wilc1000: remove unnecessary use of parentheses
staging: rtl8192u: remove redundant initialization of 'timeout'
staging: sm750fb: fix CamelCase for dispSet var
staging: lustre: lnet/selftest: fix compile error on UP build
staging: rtl8723bs: hal_com_phycfg: Remove unneeded semicolons
staging: rts5208: Fix "seg_no" calculation in reset_ms_card()
...
Pull poll annotations from Al Viro:
"This introduces a __bitwise type for POLL### bitmap, and propagates
the annotations through the tree. Most of that stuff is as simple as
'make ->poll() instances return __poll_t and do the same to local
variables used to hold the future return value'.
Some of the obvious brainos found in process are fixed (e.g. POLLIN
misspelled as POLL_IN). At that point the amount of sparse warnings is
low and most of them are for genuine bugs - e.g. ->poll() instance
deciding to return -EINVAL instead of a bitmap. I hadn't touched those
in this series - it's large enough as it is.
Another problem it has caught was eventpoll() ABI mess; select.c and
eventpoll.c assumed that corresponding POLL### and EPOLL### were
equal. That's true for some, but not all of them - EPOLL### are
arch-independent, but POLL### are not.
The last commit in this series separates userland POLL### values from
the (now arch-independent) kernel-side ones, converting between them
in the few places where they are copied to/from userland. AFAICS, this
is the least disruptive fix preserving poll(2) ABI and making epoll()
work on all architectures.
As it is, it's simply broken on sparc - try to give it EPOLLWRNORM and
it will trigger only on what would've triggered EPOLLWRBAND on other
architectures. EPOLLWRBAND and EPOLLRDHUP, OTOH, are never triggered
at all on sparc. With this patch they should work consistently on all
architectures"
* 'misc.poll' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (37 commits)
make kernel-side POLL... arch-independent
eventpoll: no need to mask the result of epi_item_poll() again
eventpoll: constify struct epoll_event pointers
debugging printk in sg_poll() uses %x to print POLL... bitmap
annotate poll(2) guts
9p: untangle ->poll() mess
->si_band gets POLL... bitmap stored into a user-visible long field
ring_buffer_poll_wait() return value used as return value of ->poll()
the rest of drivers/*: annotate ->poll() instances
media: annotate ->poll() instances
fs: annotate ->poll() instances
ipc, kernel, mm: annotate ->poll() instances
net: annotate ->poll() instances
apparmor: annotate ->poll() instances
tomoyo: annotate ->poll() instances
sound: annotate ->poll() instances
acpi: annotate ->poll() instances
crypto: annotate ->poll() instances
block: annotate ->poll() instances
x86: annotate ->poll() instances
...
Introduce hw timestamp support instead of compute sample timestamps
according to interrupt rate and configured watermark. LSM6DSx based
devices are able to queue in hw FIFO the time reference of data
sampling
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Using an SPDX tag. Remove a license notice to keep
the whole purpose of using an SPDx id.
Signed-off-by: Milan Stevanovic <milan.o.stevanovic@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Add Linux device driver for TI single-channel CMOS
8/10/12-bit analog-to-digital converter with a
high-speed serial interface.
Signed-off-by: Milan Stevanovic <milan.o.stevanovic@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Drivers should not 'select' a subsystem. Instead they should depend
on it. If the subsystem is disabled, the user probably did that for
a purpose and one driver shouldn't be changing that.
This also makes all IIO drivers consistent w.r.t depending on SYSFS
instead of selecting it.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: linux-iio@vger.kernel.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
The X-Powers AXP813 PMIC is really close to what is already done for
AXP20X/AXP22X.
There are two pairs of bits to set the rate (one for Voltage and Current
measurements and one for TS/GPIO0 voltage measurements) instead of one.
The register to set the ADC rates is different from the one for
AXP20X/AXP22X.
GPIO0 can be used as an ADC (measuring Volts) unlike for AXP22X.
The scales to apply to the different inputs are unlike the ones from
AXP20X and AXP22X.
Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
To prepare for a future patch that will add a DT node for the ADC, make
axp20x_adc able to probe from DT and get the per-variant data from
of_device_id.data since platform_device_id.driver_data won't be set when
probing by DT.
Leave the ability to probe via platform for driver compatibility with
old DTs.
Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
To prepare for a new comer that set a different register with different
values, move rate setting in a function that is specific to each AXP
variant.
Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Remove unneeded error handling on the result of a call
to platform_get_resource() when the value is passed to
devm_ioremap_resource().
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Remove unnecessary unaligned access routine in hts221_read_oneshot() and
the related include
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Introduce regmap API support to access to i2c/spi bus instead of
using a custom support.
Remove lock mutex since concurrency is already managed by regmap API
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Remove following sparse warnings in hts221_parse_temp_caldata() and in
hts221_parse_rh_caldata():
drivers/iio/humidity/hts221_core.c:302:19: warning: cast to
restricted __le16
drivers/iio/humidity/hts221_core.c:314:18: warning: cast to
restricted __le16
drivers/iio/humidity/hts221_core.c:320:18: warning: cast to
restricted __le16
drivers/iio/humidity/hts221_core.c:355:18: warning: cast to
restricted __le16
drivers/iio/humidity/hts221_core.c:361:18: warning: cast to
restricted __le16
Fixes: e4a70e3e7d ("iio: humidity: add support to hts221 rh/temp combo device")
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
gcc-8 reports
drivers/iio/accel/st_accel_i2c.c: In function 'st_accel_i2c_probe':
./include/linux/string.h:245:9: warning: '__builtin_strncpy' specified
bound 20 equals destination size [-Wstringop-truncation]
The compiler require that the length of the dest string is greater than
the length we want to copy to make sure the dest string is
nul-terminated. We can just use strlcpy() to avoid this warning.
Signed-off-by: Xiongfeng Wang <xiongfeng.wang@linaro.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
iio_priv does not return an error pointer, so check is not valid.
Patch suppresses it.
Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Use of_device_get_match_data to optimize the source code.
No check is needed on dev_data as match table is defined in driver.
Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
In case of error, the function devm_iio_device_alloc() returns NULL
pointer not ERR_PTR(). The IS_ERR() test in the return value check
should be replaced with NULL test.
Fixes: e2e6771c64 ("IIO: ADC: add STM32 DFSDM sigma delta ADC support")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Building with CONFIG_OF disabled produces a compiler warning:
drivers/iio/adc/stm32-dfsdm-core.c: In function 'stm32_dfsdm_probe':
drivers/iio/adc/stm32-dfsdm-core.c:245:22: error: unused variable 'pnode' [-Werror=unused-variable]
This removes the variable and open-codes it in the only place
it gets used to avoid that warning.
Fixes: bed73904e7 ("IIO: ADC: add stm32 DFSDM core support")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
Add iio consumer API to set buffer size and watermark according
to sysfs API.
Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This code offers a way to handle PDM audio microphones in
ASOC framework. Audio driver should use consumer API.
A specific management is implemented for DMA, with a
callback, to allows to handle audio buffers efficiently.
Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Add DFSDM driver to handle sigma delta ADC.
Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Add driver for stm32 DFSDM pheripheral. Its converts a sigma delta
stream in n bit samples through a low pass filter and an integrator.
stm32-dfsdm-core driver is the core part supporting the filter
instances dedicated to sigma-delta ADC or audio PDM microphone purpose.
Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Add generic driver to support sigma delta modulators.
Typically, this device is hardware connected to
an IIO device in charge of the conversion. Devices are
bonded through the hardware consumer API.
Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Extend the inkern API with functions for reading and writing
attribute of iio channels.
Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Add devm_iio_hw_consumer_alloc function that calls iio_hw_consumer_free
when the device is unbound from the bus.
Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Hardware consumer interface can be used when one IIO device has
a direct connection to another device in hardware.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
