linux-toradex.git/drivers/iio/dac, branch v4.10

iio: dpot-dac: DAC driver based on a digital potentiometer

2016-11-13T13:07:15+00:00

It is assumed that the dpot is used as a voltage divider between the
current dpot wiper setting and the maximum resistance of the dpot. The
divided voltage is provided by a vref regulator.

                  .------.
   .-----------.  |      |
   | vref      |--'    .---.
   | regulator |--.    |   |
   '-----------'  |    | d |
                  |    | p |
                  |    | o |  wiper
                  |    | t |<---------+
                  |    |   |
                  |    '---'       dac output voltage
                  |      |
                  '------+------------+

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

iio: dac: mcp4725: fix odd_ptr_err.cocci warnings

2016-10-23T18:34:27+00:00

PTR_ERR should access the value just tested by IS_ERR

Generated by: scripts/coccinelle/tests/odd_ptr_err.cocci

CC: Tomas Novotny 
Signed-off-by: Julia Lawall 
Signed-off-by: Fengguang Wu 
Signed-off-by: Jonathan Cameron

iio: dac: mcp4725: add devicetree support

2016-10-23T18:34:24+00:00

Signed-off-by: Tomas Novotny 
Signed-off-by: Jonathan Cameron

iio: dac: mcp4725: support voltage reference selection

2016-10-23T18:34:23+00:00

MCP47x6 chip supports selection of a voltage reference (VDD, VREF buffered
or unbuffered). MCP4725 doesn't have this feature thus the eventual setting
is ignored and user is warned.

The setting is stored only in the volatile memory of the chip. You need to
manually store it to the EEPROM of the chip via 'store_eeprom' sysfs entry.

Signed-off-by: Tomas Novotny 
Signed-off-by: Jonathan Cameron

iio: dac: mcp4725: fix incorrect comment

2016-10-23T18:34:20+00:00

Number 2 is referencing to the settings with the largest available
resistor.

No functional change.

Signed-off-by: Tomas Novotny 
Signed-off-by: Jonathan Cameron

iio: dac: mcp4725: use regulator framework

2016-10-23T18:33:51+00:00

Use a standard framework to get the reference voltage. It is done that way
in the iio subsystem and it will simplify extending of the driver.

Structure mcp4725_platform_data is left undeleted because it used in the
next patch.

This change breaks the current users of the driver, but there is no
mainline user of struct mcp4725_platform_data.

Signed-off-by: Tomas Novotny 
Signed-off-by: Jonathan Cameron

drivers: iio: dac: Fix sparse warning

2016-09-27T19:25:32+00:00

Fixing below warnings:

drivers/iio/dac/ad5592r.c:58:41: warning: incorrect type in argument 2 (different base types)
drivers/iio/dac/ad5592r.c:58:41:    expected unsigned short [usertype] *buf
drivers/iio/dac/ad5592r.c:58:41:    got restricted __be16 *
drivers/iio/dac/ad5592r.c:62:41: warning: incorrect type in argument 2 (different base types)
drivers/iio/dac/ad5592r.c:62:41:    expected unsigned short [usertype] *buf
drivers/iio/dac/ad5592r.c:62:41:    got restricted __be16 *
drivers/iio/dac/ad5592r.c:92:41: warning: incorrect type in argument 2 (different base types)
drivers/iio/dac/ad5592r.c:92:41:    expected unsigned short [usertype] *buf
drivers/iio/dac/ad5592r.c:92:41:    got restricted __be16 *
drivers/iio/dac/ad5592r.c:110:41: warning: incorrect type in argument 2 (different base types)
drivers/iio/dac/ad5592r.c:110:41:    expected unsigned short [usertype] *buf
drivers/iio/dac/ad5592r.c:110:41:    got restricted __be16 *

Signed-off-by: Sandhya Bankar 
Acked-by: Lars-Peter Clausen 
Signed-off-by: Jonathan Cameron

iio: stx104: Add IIO support for the ADC channels

2016-09-03T16:25:53+00:00

The Apex Embedded Systems STX104 features 16 channels of single-ended (8
channels of true differential) 16-bit analog input. Differential input
configuration may be selected via a physical jumper on the device.
Similarly, input polarity (unipolar/bipolar) is configured via a
physical jumper on the device.

Input gain selection is available to the user via software, thus
allowing eight possible input ranges: +-10V, +-5V, +-2.5V, +-1.25V,
0 to 10V, 0 to 5V, 0 to 2.5V, and 0 to 1.25V. Four input gain
configurations are supported: x1, x2, x4, and x8.

This ADC resolution is 16-bits (1/65536 of full scale). Analog input
samples are taken on software trigger; neither FIFO sampling nor
interrupt triggering is supported by this driver.

The Apex Embedded Systems STX104 is primarily an analog-to-digital
converter device. The STX104 IIO driver was initially placed in the DAC
directory because only the DAC portion of the STX104 was supported at
the time. Now that ADC support has been added to the STX104 IIO driver,
the driver should be moved to the more appropriate ADC directory.

Signed-off-by: William Breathitt Gray 
Signed-off-by: Jonathan Cameron

iio: dac: AD8801: add Analog Devices AD8801/AD8803 support

2016-08-29T17:20:01+00:00

Add support for Analog Devices AD8801/AD8803, 8 channels 8bits, Digital to
Analog converters.

Signed-off-by: Gwenhael Goavec-Merou 
Signed-off-by: Jonathan Cameron

iio: ad5755: fix off-by-one on devnr limit check

2016-08-29T15:15:24+00:00

The comparison for devnr limits is off-by-one, the current check
allows 0 to AD5755_NUM_CHANNELS and the limit should be in fact
0 to AD5755_NUM_CHANNELS - 1.  This can lead to an out of bounds
write to pdata->dac[devnr]. Fix this by replacing > with >= on the
comparison.

Signed-off-by: Colin Ian King 
Fixes: c947459979c6 ("iio: ad5755: add support for dt bindings")
Signed-off-by: Jonathan Cameron