PID  PPID USER     STAT   VSZ %VSZ %CPU COMMAND
  144     2 root     DW       0   0%  33% [ina226:1-8800us]
  141     2 root     DW       0   0%  25% [ina226:0-8800us]
   40     2 root     SW       0   0%  15% [irq/156-4802a00]
  147     2 root     DW       0   0%   7% [ina226:2-8800us]
  145     1 root     S     1236   0%   6% dd if /dev/iio:device1 of /dev/null
  148     1 root     S     1236   0%   4% dd if /dev/iio:device2 of /dev/null
  149   137 root     R     1244   0%   3% top -d 1
  142     1 root     S     1236   0%   2% dd if /dev/iio:device0 of /dev/null
Signed-off-by: NMarc Titinger <mtitinger@baylibre.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Different probe modules use different resistor values. The front-end
application may read a probe ID (from eeprom) and set the shunt value
accordingly.
Signed-off-by: NMarc Titinger <mtitinger@baylibre.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

This can lead to repeated or skipped samples depending on the clock beat
between the capture thread and the chip sampling clock, but will also spare
reading/waiting for the Capture Ready Flag and improve the available i2c
bandwidth for reading measurements.

Output of iio_info:
...snip...
4 device-specific attributes found:
  attr 0: in_oversampling_ratio value: 4
  attr 1: in_allow_async_readout value: 0
  attr 2: integration_time_available value: 140 204 332 588 1100 2116...
  attr 3: in_sampling_frequency value: 114
Signed-off-by: NMarc Titinger <mtitinger@baylibre.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

in SOFTWARE buffer mode, a kthread will capture the active scan_elements
into a kfifo, then compute the remaining time until the next capture tick
and do an active wait (udelay).

This will produce a stream of up to fours channels plus a 64bits
timestamps (ns).

Tested with ina226, on BeagleBoneBlack.

Datasheet: http://www.ti.com/lit/gpn/ina226Signed-off-by: NMarc Titinger <mtitinger@baylibre.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Signed-off-by: NOliver Stäbler <oliver.staebler@bytesatwork.ch>
Reviewed-by: NMartin Kepplinger <martink@posteo.de>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

The mcp3421 is the single channel variant of the mcp342x family. Support
is straight forward, only the channels array has to be added for this
chip.
Signed-off-by: NSascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

So this patch swaps that use out for kmalloc_array instead.

Signed-off-by Nizam Haider <nijamh@cdac.in>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

The iio_buffer_setup_ops structures are never modified, so declare this one
as const, like the others.

Done with the help of Coccinelle.
Signed-off-by: NJulia Lawall <Julia.Lawall@lip6.fr>
Acked-by: NLars-Peter Clausen <lars@metafoo.de>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

The scaling factor for VREFN is 3.0/4096 (not 1.0/4096), just as for
VREFP. This is not immediately obvious from the specification (Xilinx
UG480), but has been confirmed by Xilinx support.
Suggested-by: NHartmut Knaack <knaack.h@gmx.de>
Signed-off-by: NThomas Betker <thomas.betker@rohde-schwarz.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Else is not generally useful after a break or return.
Signed-off-by: NNizam Haider <nijamh@cdac.in>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

This patch adds support for the Texas Intruments ADS8688 ADC.
Signed-off-by: NSean Nyekjaer <sean.nyekjaer@prevas.dk>
Reviewed-by: NMartin Hundebøll <martin.hundeboll@prevas.dk>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

In case the fsl,adck-max-frequency property is not present in
the device tree, a division by zero error results during the
probe call on kernel boot (see below). This patch fixes it and
also restores device tree compatibility in case kernels are
booting with old device trees without this property specified.

[    1.063229] Division by zero in kernel.
[    1.067152] CPU: 0 PID: 1 Comm: swapper Not tainted
4.3.0-rc5-00212-gcc88cef #37
[    1.074650] Hardware name: Freescale Vybrid VF5xx/VF6xx (Device Tree)
[    1.081135] Backtrace:
[    1.083694] [<800134a4>] (dump_backtrace) from [<8001369c>]
(show_stack+0x18/0x1c)
[    1.091340]  r7:00000008 r6:8e0ae210 r5:00000000 r4:8e299800
[    1.097146] [<80013684>] (show_stack) from [<80297b1c>]
(dump_stack+0x24/0x28)
[    1.104483] [<80297af8>] (dump_stack) from [<80013608>]
(__div0+0x1c/0x20)
[    1.111421] [<800135ec>] (__div0) from [<802968b4>] (Ldiv0+0x8/0x10)
[    1.117865] [<80424350>] (vf610_adc_probe) from [<803153b4>]
(platform_drv_probe+0x4c/0xac)
[    1.126311]  r10:00000000 r9:8076a5ec r8:00000000 r7:fffffdfb
r6:807cc67c r5:8e0ae210
[    1.134319]  r4:807f6c54
[    1.136915] [<80315368>] (platform_drv_probe) from [<803138bc>]
(driver_probe_device+0x20c/0x2f8)
[    1.145882]  r7:807cc67c r6:00000000 r5:8e0ae210 r4:807f6c54
[    1.151657] [<803136b0>] (driver_probe_device) from [<80313a3c>]
(__driver_attach+0x94/0x98)
[    1.160190]  r9:8076a5ec r8:00000098 r7:00000000 r6:8e0ae244
r5:807cc67c r4:8e0ae210
[    1.168112] [<803139a8>] (__driver_attach) from [<80311cb8>]
(bus_for_each_dev+0x70/0xa4)
[    1.176383]  r7:00000000 r6:803139a8 r5:807cc67c r4:00000000
[    1.182159] [<80311c48>] (bus_for_each_dev) from [<80313318>]
(driver_attach+0x24/0x28)
[    1.190260]  r6:807bb568 r5:8e2a5b00 r4:807cc67c
[    1.194996] [<803132f4>] (driver_attach) from [<80312f50>]
(bus_add_driver+0x1a4/0x21c)
[    1.203113] [<80312dac>] (bus_add_driver) from [<803142a8>]
(driver_register+0x80/0x100)
[    1.211275]  r7:8e2a7dc0 r6:807a8160 r5:80789e14 r4:807cc67c
[    1.217075] [<80314228>] (driver_register) from [<803152f8>]
(__platform_driver_register+0x5c/0x64)
[    1.226216]  r5:80789e14 r4:807a8160
[    1.229877] [<8031529c>] (__platform_driver_register) from
[<80789e30>] (vf610_adc_driver_init+0x1c/0x20)
[    1.239556] [<80789e14>] (vf610_adc_driver_init) from [<800095f8>]
(do_one_initcall+0x94/0x1dc)
[    1.248365] [<80009564>] (do_one_initcall) from [<8076ae34>]
(kernel_init_freeable+0x13c/0x1e0)
[    1.257155]  r10:80794830 r9:8076a5ec r8:00000098 r7:807d5780
r6:807d5780 r5:00000006
[    1.265153]  r4:807a0ee8
[    1.267753] [<8076acf8>] (kernel_init_freeable) from [<80590ef0>]
(kernel_init+0x18/0xf0)
[    1.276021]  r10:00000000 r9:00000000 r8:00000000 r7:00000000
r6:00000000 r5:80590ed8
[    1.284015]  r4:807d5780
[    1.286615] [<80590ed8>] (kernel_init) from [<8000f878>]
(ret_from_fork+0x14/0x3c)
[    1.294278]  r5:80590ed8 r4:00000000
Signed-off-by: NSanchayan Maity <maitysanchayan@gmail.com>
Acked-by: NFugang Duan <B38611@freescale.com>
Acked-by: NStefan Agner <stefan@agner.ch>
Cc: <Stable@vger.kernel.org>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

An spi_driver does not need to set an owner, it will be populated by the
driver core.
Signed-off-by: NAndrew F. Davis <afd@ti.com>
Acked-by: NJonathan Cameron <jic23@kernel.org>
Signed-off-by: NMark Brown <broonie@kernel.org>

While the datasheet for the AD7785 lists 0xXB as the product ID the actual
product ID is 0xX3.

Fix the product ID otherwise the driver will reject the device due to non
matching IDs.

Fixes: e786cc26 ("staging:iio:ad7793: Implement stricter id checking")
Signed-off-by: NLars-Peter Clausen <lars@metafoo.de>
Cc: <Stable@vger.kernel.org>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

The driver Device Tree binding now documents compatible strings that have
a vendor prefix, so add these to the OF device ID table to match and mark
the old ones as deprecated explaining that should not be used anymore.
Signed-off-by: NJavier Martinez Canillas <javier@osg.samsung.com>
Acked-by: NMichael Welling <mwelling@ieee.org>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Calculate ADCR_VTEMP25 using VTEMP25 at VREFH_ADC 3V3. Existing
calculations consider the typical values provided in datasheet.
Those typical values are valid for VREFH_ADC at 3.0V. VTEMP25
is different for different VREFH_ADC voltages. With VREFH_ADC
at 3.3V, voltage at 25°C is 0.699V. Hence update the VTEMP25
to 0.699V which gives ADCR@Temp25 as 867.

Formula for finding ADCR@Temp25:
ADCR@Temp25 = (ADCR@Vdd * V@TEMP25 * 10) / VDDconv

ADCR@Vdd for 12-Bit ADC = 4095
VDDconv = VREFH_ADC * 10

VREFH_ADC@3.3V
ADCR@Temp25 = (4095 * .699 * 10) / 33
ADCR@Temp25 ~= 867

| VREFH_ADC | V@TEMP25 | VDDconv | ADCR@Temp25 |
|   3.0V    | 0.696mV  |    30   |     950     |
|   3.3V    | 0.699mV  |    33   |     867     |
Signed-off-by: NBhuvanchandra DV <bhuvanchandra.dv@toradex.com>
Acked-by: NFugang Duan <B38611@freescale.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Code was found at:
https://android.googlesource.com/kernel/tegra/+/a90856a6626d502d42c6e7abccbdf9d730b36270%5E%21/#F1Signed-off-by: NLaxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Marek Belisko <marek@goldelico.com> [Fixed minor typos + add channels list to documentation]
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

This driver code was found as:

https://android.googlesource.com/kernel/tegra/+/aaabb2e045f31e5a970109ffdaae900dd403d17e/drivers/staging/iio/adc

Fixed various compilation issues and test this driver on omap5 evm.
Signed-off-by: NPradeep Goudagunta <pgoudagunta@nvidia.com>
Signed-off-by: NH. Nikolaus Schaller <hns@goldelico.com>
Signed-off-by: NMarek Belisko <marek@goldelico.com>
Acked-by: NLaxman Dewangan <ldewangan@nvidia.com>
Reviewed-by: NJonathan Cameron <jic23@kernel.org>
Acked-by: NLee Jones <lee.jones@linaro.org>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

MADC[3:6] reads incorrect values without these two following changes:

- enable the 3v1 bias regulator for ADC[3:6]
- configure ADC[3:6] lines as input, not as USB
Signed-off-by: NAdam YH Lee <adam.yh.lee@gmail.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

This shouldn't actually change anything since the core calls the events
sysfs folder "events" anyways.
Signed-off-by: NMartin Kepplinger <martink@posteo.de>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

This shouldn't change anything since the core calls the events folder
"events" anyways.
Signed-off-by: NMartin Kepplinger <martink@posteo.de>
Acked-by: NLars-Peter Clausen <lars@metafoo.de>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

drivers/iio/adc/vf610_adc.c:766:1-4: WARNING: end returns can be simpified and declaration on line 755 can be dropped

 Simplify a trivial if-return sequence.  Possibly combine with a
 preceding function call.

Generated by: scripts/coccinelle/misc/simple_return.cocci

CC: Sanchayan Maity <maitysanchayan@gmail.com>
Signed-off-by: NFengguang Wu <fengguang.wu@intel.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

This platform driver has a OF device ID table but the OF module
alias information is not created so module autoloading won't work.
Signed-off-by: NLuis de Bethencourt <luisbg@osg.samsung.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Add Holt threshold detector driver for HI-8435 chip
Signed-off-by: NVladimir Barinov <vladimir.barinov@cogentembedded.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

This patch adds support for IIO buffer to the Vybrid ADC driver.
IIO triggered buffer infrastructure along with iio sysfs trigger
is used to leverage continuous sampling support provided by the
ADC block.
Signed-off-by: NSanchayan Maity <maitysanchayan@gmail.com>
Acked-by: NFugang Duan <B38611@freescale.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

The driver has an OF id table but the .of_match_table is not set so
the SPI core can't do an OF style match and the table was unused.
Signed-off-by: NJavier Martinez Canillas <javier@osg.samsung.com>
Acked-by: NMichael Welling <mwelling@ieee.org>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

The Documentation/devicetree/bindings/iio/adc/ti-adc128s052.txt DT binding
doc lists "ti,adc128s052" or "ti,adc122s021" as compatible strings but the
corresponding driver does not have an OF match table. Add the table to the
driver so the SPI core can do an OF style match.
Signed-off-by: NJavier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

The driver has an OF id table but the .of_match_table is not set so
the SPI core can't do an OF style match and the table was unused.
Signed-off-by: NJavier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

The driver currently registers a pair of irq handlers using
request_threaded_irq(), however the synchronization mechanism between the
hardirq and the threadedirq handler is a regular spinlock.

Unfortunately, this breaks PREEMPT_RT builds, where a spinlock can sleep,
and is thus not able to be acquired from a hardirq handler. This patch gets
rid of the threaded handler and pushes all interrupt handling into the
hardirq context, and uses request_irq().

To validate that this change has no impact on RT performance, here are
cyclictest values with no processes running:

$ sudo cyclictest -S -m -p 98
policy: fifo: loadavg: 0.00 0.01 0.05 1/174 2539
T: 0 ( 1405) P:98 I:1000 C:167010520 Min: 9 Act: 12 Avg: 12 Max: 75
T: 1 ( 1862) P:98 I:1500 C:111340339 Min: 9 Act: 12 Avg: 12 Max: 73

Then, all xadc raw handles were accessed in a continuous loop via
/sys/bus/iio/devices/iio:device0:

$ sudo cyclictest -S -m -p 98
policy: fifo: loadavg: 7.84 7.70 7.63 3/182 4260
T: 0 ( 2559) P:98 I:1000 C:241557018 Min: 11 Act: 18 Avg: 21 Max: 74
T: 1 ( 2560) P:98 I:1500 C:161038006 Min: 10 Act: 21 Avg: 20 Max: 73
Signed-off-by: NXander Huff <xander.huff@ni.com>
Acked-by: NLars-Peter Clausen <lars@metafoo.de>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Move the entry for the CC 10001 ADC driver in Kconfig and Makefile up to
maintain alphabetic order.
Signed-off-by: NHartmut Knaack <knaack.h@gmx.de>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Some adjustment of indentation to make checkpatch.pl happy in strict mode.
Signed-off-by: NHartmut Knaack <knaack.h@gmx.de>
Acked-by: NAntoine Tenart <antoine.tenart@free-electrons.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Move the call to enable channel interrupts into its _read() function to
have it protected by a mutex. This ensures that only one channel is
sampled at a time.
Signed-off-by: NHartmut Knaack <knaack.h@gmx.de>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Make use of GENMASK for consecutive bitmasks and BIT for single bitmasks.
Signed-off-by: NHartmut Knaack <knaack.h@gmx.de>
Acked-by: NAntoine Tenart <antoine.tenart@free-electrons.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Active channel number is stored in BERLIN2_SM_CTRL as value, instead of a
bit map.
The masks for channel interrupts and data ready are a 16 bits wide bit
map each, instead of just 4 bits.

Also correct the data mask for the temperature sensor, which was
Reported-by: NAntoine Tenart <antoine.tenart@free-electrons.com>
Signed-off-by: NHartmut Knaack <knaack.h@gmx.de>
Acked-by: NAntoine Tenart <antoine.tenart@free-electrons.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Drop the otherwise unused definition of the channel-array size and use it
directly in _probe - makes it a bit more obvious.
Signed-off-by: NHartmut Knaack <knaack.h@gmx.de>
Acked-by: NAntoine Tenart <antoine.tenart@free-electrons.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Use augmented assignment to subtract the offset for negative temperature
values.
Specify the amount of private data to be allocated through
devm_iio_device_alloc() with sizeof(*priv), as it is shorter and common
practice in IIO.
Signed-off-by: NHartmut Knaack <knaack.h@gmx.de>
Acked-by: NAntoine Tenart <antoine.tenart@free-electrons.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Mark berlin2_adc_channels array as constant.
Signed-off-by: NHartmut Knaack <knaack.h@gmx.de>
Acked-by: NAntoine Tenart <antoine.tenart@free-electrons.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

Pass up the real error code returned by platform_get_irq_byname().
Signed-off-by: NHartmut Knaack <knaack.h@gmx.de>
Acked-by: NAntoine Tenart <antoine.tenart@free-electrons.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

The driver currently does not take into account the minimum sample time
as per the Figure 6-8 Chapter 9.1.1 12-bit ADC electrical characteristics.
We set a static amount of cycles instead of considering the sample time
as a given value, which depends on hardware characteristics.

Determine sampling frequencies by first reading the device tree property
node and then calculating the required Long Sample Time Adder (LSTAdder)
value, based on the ADC clock frequency and sample time value obtained
from the device tree. This LSTAdder value is then used for calculating
the sampling frequencies possible.

In case the sample time property is not specified through the device
tree, a safe default value of 1000ns is assumed.
Signed-off-by: NSanchayan Maity <maitysanchayan@gmail.com>
Acked-by: NStefan Agner <stefan@agner.ch>
Acked-by: NFugang Duan <B38611@freescale.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

This adds support for Microchip's 13 bit 1 channel AD converter MCP3301
Signed-off-by: NAndrea Galbusera <gizero@gmail.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>