linux.git/drivers/iio/light, branch v6.6.16

iio: light: vcnl4000: Don't power on/off chip in config

2023-10-05T17:06:46+00:00

After enabling/disabling interrupts on the vcnl4040 chip the als and/or
ps sensor is powered on or off depending on the interrupt enable bits.
This is made as a last step in write_event_config.

But there is no reason to do this as the runtime PM handles the power
state of the sensors. Interfering with this may impact sensor readings.

Consider the following:
 1. Userspace makes sensor data reading which triggers RPM resume
    (sensor powered on) and a RPM suspend timeout. The timeout is 2000ms
    before RPM suspend powers the sensor off if no new reading is made
    within the timeout period.
 2. Userspace disables interrupts => powers sensor off
 3. Userspace reads sensor data = 0 because sensor is off and the
    suspend timeout has not passed. For each new reading made within the
    timeout period the timeout is renewed with 2000ms and RPM will not
    make a new resume (device was not suspended). So the sensor will
    not be powered on.
 4. No further userspace reading for 2000ms ends RPM suspend timeout and
    triggers suspend (powers off already powered off sensor).

Powering sensor off in (2) makes all consecutive readings made within
2000ms to the previous reading (3) return invalid data.

Skip setting power state when writing new event config.

Fixes: 546676121cb9 ("iio: light: vcnl4000: Add interrupt support for vcnl4040")
Fixes: bc292aaf9cb4 ("iio: light: vcnl4000: add illuminance irq vcnl4040/4200")
Signed-off-by: Mårten Lindahl 
Link: https://lore.kernel.org/r/20230907-vcnl4000-pm-fix-v2-1-298e01f54db4@axis.com
Cc: 
Signed-off-by: Jonathan Cameron

Merge 6.5-rc6 into char-misc-next

2023-08-13T20:14:51+00:00

We need the char/misc fixes in here as well to build on top of.

Signed-off-by: Greg Kroah-Hartman

iio: light: bd27008: Support BD27010 RGB

2023-08-08T08:51:06+00:00

The ROHM BU27010 is an RGBC sensor with a flickering detection FIFO. The
RGBC+IR sensor functionality is largely similar to what the BU27008 has.
There are some notable things though:
- gain setting is once again new and exotic. Now, there is 6bit gain
setting where 4 of the bits are common to all channels and 2 bits
can be configured separately for each channel. The BU27010 has
similar "1X on other channels vs 2X on IR when selector is 0x0"
gain design as BU27008 had. So, we use same gain setting policy for
BU27010 as we did for BU27008 - driver sets same gain selector for all
channels but shows the gains separately for all channels so users
can (at least in theory) detect this 1X vs 2X madness...
- BU27010 has suffled all the control register bitfields to new
addresses and bit positions while still keeping the register naming
same.
- Some more power/reset control is added.
- FIFO for "flickering detection" is added.

The control register suffling made this slightly nasty. Still, it is
easier for maintenance perspective to add the BU27010 support in BU27008
driver because - even though the bit positions/addresses were changed -
most of the driver structure can be re-used. Writing own driver for
BU27010 would mean plenty of duplicate code albeit a tad more clarity.

The flickering FIFO is not supported by the driver.

Add BU27010 RGBC+IR support to rohm-bu27008 driver.

Signed-off-by: Matti Vaittinen
Link: https://lore.kernel.org/r/111cd217ccece1c1f16ab4287532dc4e1ddb8a3f.1690958450.git.mazziesaccount@gmail.com
Signed-off-by: Jonathan Cameron

iio: light: bu27008: add chip info

2023-08-08T08:50:51+00:00

The ROHM BU27010 RGB + flickering sensor is in many regards similar to
the BU27008. Prepare for adding support for BU27010 by allowing
chip-specific properties to be brought from the of_device_id data.

Signed-off-by: Matti Vaittinen 
Link: https://lore.kernel.org/r/d5994648033d5513993b8d72eb186ddda211b5ac.1690958450.git.mazziesaccount@gmail.com
Signed-off-by: Jonathan Cameron

iio: adc: Remove redundant dev_err_probe()

2023-07-29T11:13:17+00:00

There is no need to call the dev_err() function directly to print a custom
message when handling an error from either the platform_get_irq() or
platform_get_irq_byname() functions as both are going to display an
appropriate error message in case of a failure.

Signed-off-by: Ruan Jinjie 
Reviewed-by: Linus Walleij 
Acked-by: Heiko Stuebner 
Link: https://lore.kernel.org/r/20230727073912.4178659-1-ruanjinjie@huawei.com
Signed-off-by: Jonathan Cameron

iio: light: vcnl4000: Add calibration bias for 4040/4200

2023-07-20T18:21:29+00:00

The calibration bias is setting the LED current to change the detection
distance. Add read/write attribute for proximity calibration bias and
read attribute for available values. This is supported for vcnl4040 and
vcnl4200.

Signed-off-by: Astrid Rost 
Link: https://lore.kernel.org/r/20230613135025.2596641-9-astrid.rost@axis.com
Signed-off-by: Jonathan Cameron

iio: light: vcnl4000: Add oversampling_ratio for 4040/4200

2023-07-20T18:21:29+00:00

Add the proximity multi pulse (PS_MPS) as oversampling_ratio.
Instead of one single pulse per every defined time frame, one can
program2, 4, or even 8 pulses. This leads to a longer IRED on-time
for each proximity measurement value, which also results in a higher
detection range.

Add read/write attribute for proximity oversampling-ratio and read
attribute for available oversampling-ratio.
This is supported for vcnl4040 and vcnl4200.

Signed-off-by: Astrid Rost 
Link: https://lore.kernel.org/r/20230613135025.2596641-8-astrid.rost@axis.com
Signed-off-by: Jonathan Cameron

iio: light: vcnl4000: Add period for vcnl4040/4200

2023-07-20T18:21:29+00:00

Add read/write attribute for proximity and illuminance period. The
period is set in the interrupt persistence flags(PS_PERS and ALS_PERS).
An interrupt will not be asserted if the raw value is not over (or lower)
than the threshold for the set continued amount of measurements.
The time in seconds is calculated by the number of continued refreshes
multiplied with the integration time.
It will always pick the next lower possible value. The period changes,
if the integration time is changed.

Signed-off-by: Astrid Rost 
Link: https://lore.kernel.org/r/20230613135025.2596641-7-astrid.rost@axis.com
Signed-off-by: Jonathan Cameron

iio: light: vcnl4000: add illuminance irq vcnl4040/4200

2023-07-20T18:21:29+00:00

Add support to configure ambient light sensor interrupts and threshold
limits for vcnl4040 and vcnl4200. If an interrupt is detected an event
will be pushed to the event interface.

Signed-off-by: Astrid Rost 
Link: https://lore.kernel.org/r/20230613135025.2596641-6-astrid.rost@axis.com
Signed-off-by: Jonathan Cameron

iio: light: vcnl4000: Add als_it for vcnl4040/4200

2023-07-20T18:21:29+00:00

Add illuminance integration time for vcnl4040 and vcnl4200.
Add read/write attribute for illuminance integration time and read
attribute for available integration times.
Set scale and sampling rate according to the integration time.

Signed-off-by: Astrid Rost 
Link: https://lore.kernel.org/r/20230613135025.2596641-5-astrid.rost@axis.com
Signed-off-by: Jonathan Cameron