This splits the BMP280 driver in three logical parts: the core driver
bmp280-core that only operated on a struct device * and a struct regmap *,
the regmap driver bmp280-regmap that can be shared between I2C and other
transports and the I2C module driver bmp280-i2c.

Cleverly bake all functionality into a single object bmp280.o so that
we still get the same module binary built for the device in the end,
without any fuzz exporting symbols to the left and right.
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

The BMP085/BMP180/BMP280 is supplied with two power sources:
VDDA (analog power) and VDDD (digital power). As these may come
from regulators (as on the APQ8060 Dragonboard) we need the driver
to attempt to fetch and enable these regulators.

We FAIL if we cannot: boards should either define:
- Proper regulators if present
- Define fixed regulators if power is hardwired to the component
- Rely on dummy regulators (will be present on all DT systems and
  any boardfile system that calls regulator_has_full_constraints().

Cc: Mark Brown <broonie@kernel.org>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Added macros for sensing range as the corresponding magic numbers
were used at multiple places.
   - ISL29125_SENSING_RANGE_0 for 375 lux full range
   - ISL29125_SENSING_RANGE_1 for 10k lux full range
Signed-off-by: NBijosh Thykkoottathil <bijosh.t@hotmail.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Leonard Crestez observed the following phenomenon: when using
hard interrupt triggers (the DRDY line coming out of an ST
sensor) sometimes a new value would arrive while reading the
previous value, due to latencies in the system.

We discovered that the ST hardware as far as can be observed
is designed for level interrupts: the DRDY line will be held
asserted as long as there are new values coming. The interrupt
handler should be re-entered until we're out of values to
handle from the sensor.

If interrupts were handled as occurring on the edges (usually
low-to-high) new values could appear and the line be held
asserted after that, and these values would be missed, the
interrupt handler would also lock up as new data was
available, but as no new edges occurs on the DRDY signal,
nothing happens: the edge detector only detects edges.

To counter this, do the following:

- Accept interrupt lines to be flagged as level interrupts
  using IRQF_TRIGGER_HIGH and IRQF_TRIGGER_LOW. If the line
  is marked like this (in the device tree node or ACPI
  table or similar) it will be utilized as a level IRQ.
  We mark the line with IRQF_ONESHOT and mask the IRQ
  while processing a sample, then the top half will be
  entered again if new values are available.

- If we are flagged as using edge interrupts with
  IRQF_TRIGGER_RISING or IRQF_TRIGGER_FALLING: remove
  IRQF_ONESHOT so that the interrupt line is not
  masked while running the thread part of the interrupt.
  This way we will never miss an interrupt, then introduce
  a loop that polls the data ready registers repeatedly
  until no new samples are available, then exit the
  interrupt handler. This way we know no new values are
  available when the interrupt handler exits and
  new (edge) interrupts will be triggered when data arrives.
  Take some extra care to update the timestamp in the poll
  loop if this happens. The timestamp will not be 100%
  perfect, but it will at least be closer to the actual
  events. Usually the extra poll loop will handle the new
  samples, but once in a blue moon, we get a new IRQ
  while exiting the loop, before returning from the
  thread IRQ bottom half with IRQ_HANDLED. On these rare
  occasions, the removal of IRQF_ONESHOT means the
  interrupt will immediately fire again.

- If no interrupt type is indicated from the DT/ACPI,
  choose IRQF_TRIGGER_RISING as default, as this is necessary
  for legacy boards.

Tested successfully on the LIS331DL and L3G4200D by setting
sampling frequency to 400Hz/800Hz and stressing the system:
extra reads in the threaded interrupt handler occurs.

Cc: Giuseppe Barba <giuseppe.barba@st.com>
Cc: Denis Ciocca <denis.ciocca@st.com>
Tested-by: NCrestez Dan Leonard <cdleonard@gmail.com>
Reported-by: NCrestez Dan Leonard <cdleonard@gmail.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

This adds runtime PM support to the AK8975 driver. It solves two
problems:

- After reading the first value the chip was left in MODE_ONCE,
  meaning (presumably) it may be consuming more power. Now the
  runtime PM hooks kick in and set it to POWER_DOWN.

- Regulators were simply enabled and left on, making it
  impossible to turn the power consuming regulators off because
  of the increased refcount. We now disable the regulators at
  autosuspend.

- We also handle system suspend: by using pm_runtime_force_suspend()
  and pm_runtime_force_resume() from the system PM sleep hooks,
  the runtime PM code is managing the power also for this case.
  It is currently not completely optimal: when the system resumes
  the AK8975 goes into active mode even if noone is going to use
  it: currently the force calls need to be paired, but the runtime
  PM people are working on making it possible to leave devices
  runtime suspended when coming back from sleep.

Inspired by my work on the BH1780 light sensor driver.
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
Reviewed-by: NUlf Hansson <ulf.hansson@linaro.org>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

The code was not powering the magnetometer down properly at
remove(): just cutting the regulators without first setting the
device in power off mode. Fix this.
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
Reviewed-by: NUlf Hansson <ulf.hansson@linaro.org>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

The datasheet actually specifies that we need to wait atleast
500us after powering on the device before trying to set mode.
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Move the regulator_get() calls directly into the probe() function,
keep only the power_on()/power_off() functions to flick the
regulators on/off.
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

The AK8975 has two power sources: Vdd (analog voltage supply)
and Vid (digital voltage supply). Optionally also obtain the Vid
supply regulator and enable it.

If an error occurs when enabling one of the regulators: bail out.

Cc: Gregor Boirie <gregor.boirie@parrot.com>
Cc: Richard Leitner <dev@g0hl1n.net>
Cc: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

IS_ERR_OR_NULL() should never be used with regulators because
a NULL pointer may be a perfectly valid dummy regulator

We should always succeed to fetch and enable a regulator, but
it may be a dummy. That is fine, so bail out for any real
errors or probe deferrals

Include the error code in the warning print so we know what
kind of problem we're dealing with (for example it is nice to
see if it is a probe deferral).

As we will bail out of probe if the regulator is erroneous,
just issue regulator_disable() on the poweroff path: it will
succeed.

Cc: Mark Brown <broonie@kernel.org>
Cc: Lars-Peter Clausen Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

On the APQ8060 Dragonboard the reset line to the BMP085 pressure
sensor is not deasserted on boot, so the driver needs to handle
this. For a simple GPIO line supplied as a descriptor (from a board
file, device tree or ACPI) this does the trick.
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

This adds device tree support to the BMP085, BMP180 and BMP280
pressure sensors. Tested on the Qualcomm APQ8060 Dragonboard:

iio:device1$ cat in_temp_input
26700
iio:device1$ cat in_pressure_input
99.185000000
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

This adds standard device tree bindings for a reset GPIO line, and
the VDDD and VDDA power regulators.

Cc: devicetree@vger.kernel.org
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Adds a new per-device sysfs attribute "current_timestamp_clock" to allow
userspace to select a particular POSIX clock for buffered samples and
events timestamping.

Following clocks, as listed in clock_gettime(2), are supported:
CLOCK_REALTIME, CLOCK_MONOTONIC, CLOCK_MONOTONIC_RAW,
CLOCK_REALTIME_COARSE, CLOCK_MONOTONIC_COARSE, CLOCK_BOOTTIME and
CLOCK_TAI.
Signed-off-by: NGregor Boirie <gregor.boirie@parrot.com>
Acked-by: NSanchayan Maity <maitysanchayan@gmail.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

EXPORT_SYMBOL() get_monotonic_coarse64 for new IIO timestamping clock
selection usage. This provides user apps the ability to request a
particular IIO device to timestamp samples using a monotonic coarse clock
granularity.
Signed-off-by: NGregor Boirie <gregor.boirie@parrot.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Merge tag 'iio-for-4.8b' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into staging-next

Jonathan writes:

Second round of new iio device support, features and cleanups in the 4.8 cycle

Firstly some contact detail updates:
* NXP took over freescale. Update the mma8452 header to reflect this.
* Martin Kepplinger email address change in mma8452 header.
* Adriana Reus has changed email address. Update .mailmap.
* Matt Ranostay has changed email address. Update .mailmap.

New Device Support
* max1363
  - add the missing i2c_device_ids for a couple of parts so they can actually
    be used.
* ms5867
  - add device ids for ms5805 and ms5837 parts.

New Features
* ad5755
  - DT support.  This one was a bit controversial and under review for a long
    time.  Still no one could come up with a better solution.
* stx104
  - add gpio support
* ti-adc081c
  - Add ACPI device ID matching.

Core changes
* Refuse to register triggers with duplicate names.  There is no way to
  distinguish between them so this makes no sense.  A few drivers do not
  generate unique names for each instance of the device present.  We can't
  fix this without changing ABI so leave them and wait for someone to
  actually take the rare step of two identical accelerometers on the same
  board.
* buffer-dma
  - use ARRAY_SIZE in a few appropriate locations.

Tools
* Fix the fact that the --trigger-num option in generic_buffer didn't allow
  0 which is perfectly valid in the ABI.

Cleanups
* as3935
  - improve error reporting.
  - remove redundant zeroing of a field in iio_priv.
* gp2ap020a00f
  - use the iio_device_claim_*_mode helpers rather than open coding locking
  around mode changes.
* isl29125
  - use the iio_device_claim_*_mode helpers rather than open coding locking.
* lidar
  - use the iio_device_claim_*_mode helpers rather than open coding locking.
* mma8452
  - more detail in devices supported description in comments (addresses and
  similar)
* sca3000
  - add a missing error check.
* tcs3414
  - use the iio_device_claim_*_mode helpers rather than open coding locking.
* tcs3472
  - use the iio_device_claim_*_mode helpers rather than open coding locking.

Signed-off-by: NSean Nyekjaer <sean.nyekjaer@prevas.dk>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Devicetree can provide platform data
Signed-off-by: NSean Nyekjaer <sean.nyekjaer@prevas.dk>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Use the ARRAY_SIZE macro in the for loops that access queue->fileio.blocks.
Macro is already used in a couple of places where this access occurs,
but range was hardcoded in these locations.
Signed-off-by: NPhil Reid <preid@electromag.com.au>
Acked-by: NLars-Peter Clausen <lars@metafoo.de>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

The driver supports MAX11644, MAX11645, MAX11646 and MAX11647 parts. But
the corresponding i2c_device_id are missing. Add them!
Signed-off-by: NFlorian Vaussard <florian.vaussard@heig-vd.ch>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

This is redundant as the containing stucture is allocated as part of
iio_device_alloc using kzalloc and hence is already 0.
Signed-off-by: NMatt Ranostay <mranostay@gmail.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

The Apex Embedded Systems STX104 device features eight lines of digital
I/O (four digital inputs and four digital outputs). This patch adds GPIO
support for these eight lines of digital I/O via GPIOLIB.

Cc: Alexandre Courbot <gnurou@gmail.com>
Signed-off-by: NWilliam Breathitt Gray <vilhelm.gray@gmail.com>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

gcc warns about a potentially uninitialized variable use
in as3935_event_work:

drivers/iio/proximity/as3935.c: In function ‘as3935_event_work’:
drivers/iio/proximity/as3935.c:231:6: error: ‘val’ may be used uninitialized in this function [-Werror=maybe-uninitialized]

This case specifically happens when spi_w8r8() fails with a
negative return code. We check all other users of this function
except this one.

As the error is rather unlikely to happen after the device
has already been initialized, this just adds a dev_warn().
Another warning already exists in the same function, but is
missing a trailing '\n' character, so I'm fixing that too.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NMatt Ranostay <mranostay@gmail.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Go to error_ret if sca3000_read_ctrl_reg() failed.
Signed-off-by: NLuis de Bethencourt <luisbg@osg.samsung.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Add ACPI device ID matching for TI ADC081C/ADC101C/ADC121C ADCs.
Signed-off-by: NDan O'Donovan <dan@emutex.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

The trigger name is documented as unique but drivers are currently
allowed to register triggers with duplicate names. This should be
considered a bug since it makes the 'current_trigger' interface
unusable.
Signed-off-by: NCrestez Dan Leonard <leonard.crestez@intel.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

The layer abstracting the building of commands and extracting
responses is currently based on macros that shift and mask the command
fields and requires exposing offset/size values as macro parameters
and makes the code harder to read.

For clarity and maintainability, instead use an implementation based on
mapping the MC command definitions to C structures. These structures
contain the hardware command fields (which are naturally-aligned)
and individual fields are little-endian ordering (the byte ordering
of the hardware).

As such, there is no need to perform the conversion between core and
hardware (LE) endianness in mc_send_command(), but instead each
individual field in a command will be converted separately if needed
by the function building the command or extracting the response.

This patch does not introduce functional changes, both the hardware
ABIs and the APIs exposed for the DPAA2 objects remain the same.
Signed-off-by: NIoana Radulescu <ruxandra.radulescu@nxp.com>
Signed-off-by: NStuart Yoder <stuart.yoder@nxp.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

For an MSI domain the hwirq is an arbitrary but unique
id to identify an interrupt.  Previously the hwirq was set to
the MSI index of the interrupt, but that only works if there is
one DPRC.  Additional DPRCs require an expanded namespace.  Use
both the ICID (which is unique per DPRC) and the MSI index to
compose a hwirq value.
Signed-off-by: NStuart Yoder <stuart.yoder@nxp.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

When unbinding a dprc from the dprc driver the cleanup of
the resource pools must happen after irq pool cleanup
is done.
Signed-off-by: NStuart Yoder <stuart.yoder@nxp.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

add missing free of the Linux irq when tearing down interrupts
Signed-off-by: NStuart Yoder <stuart.yoder@nxp.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

An mc_io represents a mapped MC portal.  Previously, an mc_io was
created for the root dprc in fsl_mc_bus_probe() and for child dprcs
in dprc_probe().  But the free of that data structure happened in the
general bus remove callback.  This asymmetry resulted in some bugs due
to unwanted destroys of mc_io object in some scenarios (e.g. vfio).

Fix this bug by making things symmetric-- mc_io created in
fsl_mc_bus_probe() is freed in fsl_mc_bus_remove().  The mc_io created
in dprc_probe() is freed in dprc_remove().
Signed-off-by: NBharat Bhushan <Bharat.Bhushan@nxp.com>
[Stuart: added check for root dprc and reworded commit message]
Signed-off-by: NStuart Yoder <stuart.yoder@nxp.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

make fsl_mc_is_root_dprc() global so that the dprc driver
can use it
Signed-off-by: NStuart Yoder <stuart.yoder@nxp.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

some drivers (built as modules) rely on mc_get_version()
Signed-off-by: NStuart Yoder <stuart.yoder@nxp.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Move the definition of fsl_mc_device_id to its proper location in
mod_devicetable.h, and add fsl-mc bus support to devicetable-offsets.c
and file2alias.c to enable device table matching.  With this patch udev
based module loading of fsl-mc drivers is supported.
Signed-off-by: NStuart Yoder <stuart.yoder@nxp.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

-rename the struct used for fsl-mc device ids to be more
 consistent with other busses
-remove the now obsolete and unused version fields
Signed-off-by: NStuart Yoder <stuart.yoder@nxp.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Replace placeholder code in the uevent callback to properly
set the MODALIAS env variable.
Signed-off-by: NStuart Yoder <stuart.yoder@nxp.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

In order to support uevent based module loading implement modalias support
for the fsl-mc bus driver. Aliases are based on vendor and object/device
id and are of the form "fsl-mc:vNdN".
Signed-off-by: NStuart Yoder <stuart.yoder@nxp.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

In case of error, the function kthread_run() returns ERR_PTR()
and never returns NULL. The NULL test in the return value check
should be replaced with IS_ERR().
Signed-off-by: NWei Yongjun <yongjun_wei@trendmicro.com.cn>
Reviewed-by: NJulian Calaby <julian.calaby@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

hif_drv->usr_scan_req.net.net_info[i] contains found_net_info structs
which have the following element:
u8 bssid[6];

pstrNetworkInfo, of type network_info, also contains an u8 array named
bssid.

request->ssids is an array of cfg80211_ssid structs. Making ssid:
u8 ssid[IEEE80211_MAX_SSID_LEN];

In these 3 cases the arrays are being checked against NULL, which can't
happen. Removing the checks since they will always be true.

Found with smatch:
drivers/staging/wilc1000/host_interface.c:1234 Handle_RcvdNtwrkInfo() warn: this array is probably non-NULL. 'hif_drv->usr_scan_req.net_info[i].bssid'
drivers/staging/wilc1000/host_interface.c:1235 Handle_RcvdNtwrkInfo() warn: this array is probably non-NULL. 'pstrNetworkInfo->bssid'
drivers/staging/wilc1000/host_interface.c:1253 Handle_RcvdNtwrkInfo() warn: this array is probably non-NULL. 'hif_drv->usr_scan_req.net_info[hif_drv->usr_scan_req.rcvd_ch_cnt].bssid'
drivers/staging/wilc1000/host_interface.c:1254 Handle_RcvdNtwrkInfo() warn: this array is probably non-NULL. 'pstrNetworkInfo->bssid'
Signed-off-by: NLuis de Bethencourt <luisbg@osg.samsung.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Replace the interface 'wilc_mq_send' with 'wilc_enqueue_cmd'
and remove the now unused structures 'message' and 'message_queue'.
Restructure switch statement in the work queue helper function
host_if_work and remove unwanted indentation.
Signed-off-by: NBinoy Jayan <binoy.jayan@linaro.org>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>