| From: |
| Oleksij Rempel <o.rempel-AT-pengutronix.de> |
| To: |
| Rob Herring <robh+dt-AT-kernel.org>, Jonathan Cameron <jic23-AT-kernel.org> |
| Subject: |
| [PATCH v5 0/3] mainline ti tsc2046 adc driver |
| Date: |
| Mon, 29 Mar 2021 09:31:28 +0200 |
| Message-ID: |
| <20210329073131.1759-1-o.rempel@pengutronix.de> |
| Cc: |
| Oleksij Rempel <o.rempel-AT-pengutronix.de>, devicetree-AT-vger.kernel.org, linux-kernel-AT-vger.kernel.org, Pengutronix Kernel Team <kernel-AT-pengutronix.de>, David Jander <david-AT-protonic.nl>, Robin van der Gracht <robin-AT-protonic.nl>, linux-iio-AT-vger.kernel.org, Lars-Peter Clausen <lars-AT-metafoo.de>, Peter Meerwald-Stadler <pmeerw-AT-pmeerw.net>, Dmitry Torokhov <dmitry.torokhov-AT-gmail.com> |
| Archive-link: |
| Article |
changes v5:
- remove type for the settling-time-us property
changes v4:
- spell fixes
- add more comments
- make code more readable
- move scan_buf to the priv
- use FIELD_GET to extract ADC data
- make some multi line code as one line
- do not use atomic API for trig_more_count
- fix build warning on 64bit system
- add NULL check for the devm_kasprintf()
- use return devm_iio_device_register(), without additional error
printing.
changes v3:
- different spell fixes
- add some notes about driver structure
- rename the trigger to point on the touchscreen nature of it
- rename DT binding to oversampling-ratio
- make sure we have some defaults in case no DT property is set
changes v2:
- rework and extend DT binding properties
- remove touchscreen related code from the IIO ADC driver
- make trigger be active longer then IRQ is requesting. This is needed
to get "inactive" samples
- make oversampling and settle time configurable
TI TSC2046 is a touchscreen controller based on 8 channel ADC. Since most of
this ADC based touchscreen controller share same set of challenges, it
is better keep then as simple IIO ADC devices attached to a generic
resistive-adc-touch driver.
This driver can replace drivers/input/touchscreen/ads7846.c and has
following advantages over it:
- less code to maintain
- shared code paths (resistive-adc-touch, iio-hwmon, etc)
- can be used as plain IIO ADC to investigate signaling issues or test
real capacity of the plates and attached low-pass filters
(or use the touchscreen as a microphone if you like ;) )
Oleksij Rempel (3):
dt-bindings:iio:adc: add generic settling-time-us and
oversampling-ratio channel properties
dt-bindings:iio:adc: add documentation for TI TSC2046 controller
iio: adc: add ADC driver for the TI TSC2046 controller
.../devicetree/bindings/iio/adc/adc.yaml | 8 +
.../bindings/iio/adc/ti,tsc2046.yaml | 115 +++
MAINTAINERS | 8 +
drivers/iio/adc/Kconfig | 12 +
drivers/iio/adc/Makefile | 1 +
drivers/iio/adc/ti-tsc2046.c | 726 ++++++++++++++++++
6 files changed, 870 insertions(+)
create mode 100644 Documentation/devicetree/bindings/iio/adc/ti,tsc2046.yaml
create mode 100644 drivers/iio/adc/ti-tsc2046.c
--
2.29.2
