On Tue, 22 May 2018 10:52:30 +0300 Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx> wrote: > Hello, > > This patch series is a rework of my previous series named: > [PATCH 00/14] iio: triggers: add consumer support > > This is the version 7 of the series, and addresses the received feedback > on the v2 series named: > [PATCH v2 00/10] Add support for SAMA5D2 touchscreen > and the v3 series named > [PATCH v3 00/11] Add support for SAMA5D2 touchscreen > and the v4 series named > [PATCH v4 0/9] Add support for SAMA5D2 touchscreen > and fixes one bug found in series named > [PATCH v5 0/9] Add support for SAMA5D2 touchscreen > and addresses comments in series named > [PATCH v6 0/9] Add support for SAMA5D2 touchscreen > > This series applies on top of fixes-togreg branch of iio.git, > specifically on top of commit: > "f0c8d1f" : iio: adc: at91-sama5d2_adc: > fix channel configuration for differential channels > > Jonathan, if you need me to rebase this on top of testing, let me know. > > Changes in previous versions are presented at the end of the cover letter below. > Thanks everyone for the feedback. Below is the original v2 cover letter: > > In few words, this is the implementation of splitting the functionality > of the IP block ADC device in SAMA5D2 SoC from ADC with touchscreen > support. In order to avoid having a MFD device, two separate > drivers that would work on same register base and split the IRQ,etc, > as advised on the mailing list, I created a consumer driver for the > channels, that will connect to the ADC as described in the device tree. > > I have collected feedback from everyone and here is the result: > I have added a new generic resistive touchscreen driver, which acts > as a iio consumer for the given channels and will create an input > device and report the events. It uses a callback buffer to register > to the IIO device and waits for data to be pushed. > Inside the IIO device, I have kept a similar approach with the first version > of the series, except that now the driver can take multiple buffers, and > will configure the touchscreen part of the hardware device if the specific > channels are requested. > > The SAMA5D2 ADC driver registers three new channels: two for the > position on the X and Y axis, and one for the touch pressure. > When channels are requested, it will check if the touchscreen channel mask > includes the requested channels (it is possible that the consumer driver > will not request pressure for example). If it's the case, it will work > in touchscreen mode, and will refuse to do usual analog-digital conversion, > because we have a single trigger and the touchscreen needs it. > When the scan mask will include only old channels, the driver will function > in the same way as before. If the scan mask somehow is a mix of the two (the > masks intersect), the driver will refuse to work whatsoever (cannot have both > in the same time). > The driver allows reading raw data for the new channels, if claim direct > mode works: no touchscreen driver requested anything. The new channels can > act like the old ones. However, when requesting these channels, the usual > trigger will not work and will not be enabled. The touchscreen channels > require special trigger and irq configuration: pen detect, no pen detect > and a periodic trigger to sample the touchscreen position and pressure. > If the user attempts to use another trigger while there is a buffer > that already requested the touchscreen channels (thus the trigger), the > driver will refuse to comply. > > In order to have defines for the channel numbers, I added a bindings include > file that goes on a separate commit : > dt-bindings: iio: adc: at91-sama5d2_adc: add channel specific consumer info > This should go in the same tree with the following commits : > ARM: dts: at91: sama5d2: add channel cells for ADC device > ARM: dts: at91: sama5d2: Add resistive touch device > > as build will break because these commits depend on the binding one > which creates the included header file. > V5 update: After discussing with Alexandre Belloni on Mailing list, the two > DTS patches are to be taken in the next version after bindings reach mainline. > > Changes in v7: > - Addressed some feedback from Dmitry, explained in input driver patch > changelog. > - Added Acked-by Dmitry. > > Changes in v6: > - Fixed a crash in ADC driver , explained in driver patch changelog. > - changed a dev_err to dev_dbg in input driver. > - added Reviewed-by Rob Herring. > > Changes in v5: > - renamed property touchscreen-threshold-pressure to touchscreen-min-pressure > - added one return in touchscreen driver > > Changes in v4: > - removed patch for inkern module get/set kref > - addressed feedback on both the ADC and the touchscreen driver. each > patch has a history inside the patch file for the specific changes. > - patch that fixes the channel fix > [PATCH v3 01/11] iio: adc: at91-sama5d2_adc: > fix channel configuration for differential channels > was accepted in fixes-togreg branch thus removed from this series. > - added Reviewed-by for the bindings by Rob Herring > > Changes in v3: > - changed input driver name according to feedback and reworked in commits > to adapt to binding changes and new name. > - moved channel index fix in at91-sama5d2_adc at the beginning of the series > (PATCH 01/11) > - created a new optional binding for the touchscreen as a separate commit > and added it to the series : > [PATCH v3 04/11] dt-bindings: input: touchscreen: add pressure > threshold touchscreen property > - changed at91-sama5d2_adc driver patch to address the comments. Exact changes > are in the patch file for the driver source file. > > Eugen Hristev (9): > MAINTAINERS: add generic resistive touchscreen adc > iio: Add channel for Position Relative > dt-bindings: input: touchscreen: add minimum pressure touchscreen > property > dt-bindings: input: touchscreen: resistive-adc-touch: create bindings > iio: adc: at91-sama5d2_adc: add support for position and pressure > channels > input: touchscreen: resistive-adc-touch: add generic resistive ADC > touchscreen > dt-bindings: iio: adc: at91-sama5d2_adc: add channel specific consumer > info > ARM: dts: at91: sama5d2: add channel cells for ADC device > ARM: dts: at91: sama5d2: Add resistive touch device > > Documentation/ABI/testing/sysfs-bus-iio | 12 + > .../bindings/iio/adc/at91-sama5d2_adc.txt | 9 + > .../input/touchscreen/resistive-adc-touch.txt | 30 + > .../bindings/input/touchscreen/touchscreen.txt | 3 + > MAINTAINERS | 6 + > arch/arm/boot/dts/sama5d2.dtsi | 12 + > drivers/iio/adc/at91-sama5d2_adc.c | 609 +++++++++++++++++++-- > drivers/iio/industrialio-core.c | 1 + > drivers/input/touchscreen/Kconfig | 13 + > drivers/input/touchscreen/Makefile | 1 + > drivers/input/touchscreen/resistive-adc-touch.c | 204 +++++++ > include/dt-bindings/iio/adc/at91-sama5d2_adc.h | 16 + > include/uapi/linux/iio/types.h | 1 + > tools/iio/iio_event_monitor.c | 2 + > 14 files changed, 861 insertions(+), 58 deletions(-) > create mode 100644 Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.txt > create mode 100644 drivers/input/touchscreen/resistive-adc-touch.c > create mode 100644 include/dt-bindings/iio/adc/at91-sama5d2_adc.h > Hi All, I'm happy to take this, but there is a slight issue that we have a fix working it's way in which this is dependent on. I'll see if we can get this sorted before the merge window, but we may be cutting it fine. Jonathan -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
