linux-toradex.git/drivers/iio/temperature, branch v4.2.8

iio: mlx96014: Replace offset sign

2015-07-19T11:23:39+00:00

Changed the offset to negative as usual equation is: (raw +
offset)*scale and in this
case offset should be negative (as we deduct 273.15 Kelvin to get temperature
in Celsius).

Signed-off-by: Crt Mori 
Acked-by: Peter Meerwald 
Signed-off-by: Jonathan Cameron

iio: tmp006: Check channel info on write

2015-07-19T10:48:18+00:00

only SAMP_FREQ is writable

Will lead to SAMP_FREQ being written by any attempt to write
to the other exported attributes and hence a rather unexpected
result!

Signed-off-by: Peter Meerwald 
Cc: 
Signed-off-by: Jonathan Cameron

iio:temp:mlx90614 trivial drop of unnecessary ret return from write_raw.

2015-05-13T17:40:31+00:00

This is mostly part of an effort to clean out our current warnings
and make the autobuilder build reports more useful.

Still a worthwhile if trivial cleanup!

Signed-off-by: Jonathan Cameron 
Reported-by: kbuild test robot 
Cc: Vianney le Clément de Saint-Marcq 
Cc: Peter Meerwald

iio:tmp006: Prefix #defines with TMP006_

2015-04-18T19:36:15+00:00

just cleanup, no functional change

Signed-off-by: Peter Meerwald 
Signed-off-by: Jonathan Cameron

iio: mlx90614: Fix duplicate const warning

2015-04-18T18:57:47+00:00

Fix a typo triggering a duplicate const warning on some compilers.

Signed-off-by: Vianney le Clément de Saint-Marcq 
Cc: Arnout Vandecappelle (Essensium/Mind) 
Signed-off-by: Jonathan Cameron

iio: mlx90614: Check for errors in read values

2015-04-09T14:10:18+00:00

The device uses the MSB of the returned temperature value as an error
flag.  Return a read error when this bit is set.

Signed-off-by: Vianney le Clément de Saint-Marcq 
Cc: Arnout Vandecappelle (Essensium/Mind) 
Signed-off-by: Jonathan Cameron

iio: mlx90614: Add power management

2015-04-09T14:09:16+00:00

Add support for system sleep and runtime power management.

To wake up the device, the SDA line should be held low for at least 33ms
while SCL is high.  As this is not possible using the i2c API (and not
supported by all i2c adapters), a GPIO connected to the SDA line is
needed.  The GPIO is named "wakeup" and can be specified in a device
tree with the "wakeup-gpios" binding.

If the wake-up GPIO is not given, disable power management for the
device.  Entering sleep requires an SMBus byte access, hence power
management is also disabled if byte access is not supported by the
adapter.

Signed-off-by: Vianney le Clément de Saint-Marcq 
Cc: Arnout Vandecappelle (Essensium/Mind) 
Signed-off-by: Jonathan Cameron

iio: mlx90614: Add emissivity setting

2015-04-09T14:06:31+00:00

The mapping from the 16-bit EEPROM value to the decimal 0-1 range is
approximate.  A special case ensures 0xFFFF shows as 1.0 instead of
0.999998565.

Writing to EEPROM requires an explicit erase by writing zero.  In
addition, it takes 20ms for the erase/write to complete.  During this
time no EEPROM register should be accessed.  Therefore, two msleep()s
are added to the write function and a mutex protects against concurrent
access.

Signed-off-by: Vianney le Clément de Saint-Marcq 
Cc: Arnout Vandecappelle (Essensium/Mind) 
Signed-off-by: Jonathan Cameron

iio: mlx90614: Support devices with dual IR sensor

2015-03-29T15:17:12+00:00

The model is detected by reading the EEPROM configuration during
probing.

Signed-off-by: Vianney le Clément de Saint-Marcq 
Cc: Arnout Vandecappelle (Essensium/Mind) 
Signed-off-by: Jonathan Cameron

iio: mlx90614: Add symbols for accessible registers

2015-03-29T15:17:11+00:00

Add symbols for all accessible RAM and EEPROM registers, as well as the
sleep command and timings defined in the datasheet.

Signed-off-by: Vianney le Clément de Saint-Marcq 
Cc: Arnout Vandecappelle (Essensium/Mind) 
Signed-off-by: Jonathan Cameron