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path: root/drivers/iio/potentiometer
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2019-08-05iio: potentiometer: add a driver for Maxim 5432-5435Martin Kaiser
Add a driver for the Maxim Integrated MAX5432-MAX5435 family of digital potentiometers. These potentiometers are connected via I2C and have 32 wiper positions. Supported functionality - set the volatile wiper position - read the potentiometer scale Datasheet: https://datasheets.maximintegrated.com/en/ds/MAX5432-MAX5435.pdf Signed-off-by: Martin Kaiser <martin@kaiser.cx> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2019-06-19treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500Thomas Gleixner
Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-21treewide: Add SPDX license identifier - Makefile/KconfigThomas Gleixner
Add SPDX license identifiers to all Make/Kconfig files which: - Have no license information of any form These files fall under the project license, GPL v2 only. The resulting SPDX license identifier is: GPL-2.0-only Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-04-04drivers: iio: Kconfig: pedantic cleanupEnrico Weigelt, metux IT consult
Formatting of Kconfig files doesn't look so pretty, so just take damp cloth and clean it up. Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2018-11-25iio: potentiometer: Add driver for Microchip MCP41xxx/42xxxChris Coffey
This patch adds driver support for the Microchip MCP41xxx/42xxx family of digital potentiometers: DEVICE Wipers Positions Resistance (kOhm) MCP41010 1 256 10 MCP41050 1 256 50 MCP41100 1 256 100 MCP42010 2 256 10 MCP42050 2 256 50 MCP42100 2 256 100 Datasheet: http://ww1.microchip.com/downloads/en/devicedoc/11195c.pdf Signed-off-by: Chris Coffey <cmc@babblebit.net> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2018-11-16iio: potentiometer: mcp4131: use of_device_get_match_data()Slawomir Stepien
Try to get the device's data using OF API. In case of failure, fallback to the spi_get_device_id() method. Signed-off-by: Slawomir Stepien <sst@poczta.fm> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2018-11-11iio: potentiometer: tpl0102: add IIO_AVAIL_RANGE supportMatt Ranostay
Report the step range of the respective potentiometers that are possible to userspace. Signed-off-by: Matt Ranostay <matt.ranostay@konsulko.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2018-11-11iio: potentiometer: tpl0102: switch to using pointer to chip configMatt Ranostay
More concise to have a pointer to tpl0102_cfg struct in the iio_priv data than an integer to an index of an array. Signed-off-by: Matt Ranostay <matt.ranostay@konsulko.com> Reviewed-by: Slawomir Stepien <sst@poczta.fm> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2018-08-20iio: potentiometer: mcp4531: switch to SPDX license identifierPeter Rosin
Drop the boilerplate license text and use the correct MODULE_LICENSE. Signed-off-by: Peter Rosin <peda@axentia.se> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2018-08-20iio: potentiometer: mcp4018: use the correct MODULE_LICENSEPeter Rosin
The file is GPL v2 only. Signed-off-by: Peter Rosin <peda@axentia.se> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2018-08-19iio: potentiometer: merge calls to of_match_device and of_device_get_match_dataJulia Lawall
Drop call to of_match_device, which is subsumed by the subsequent call to of_device_get_match_data. The code becomes simpler, and a temporary variable can be dropped. The semantic match that makes this change is as follows: (http://coccinelle.lip6.fr/) // <smpl> @r@ local idexpression match; identifier i; expression x, dev, e, e1; @@ - match@i = of_match_device(x, dev); - if (match) e = of_device_get_match_data(dev); - else e = e1; + e = of_device_get_match_data(dev); + if (!e) e = e1; @@ identifier r.i; @@ - const struct of_device_id *i; ... when != i // </smpl> Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Reviewed-by: Peter Rosin <peda@axentia.se> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2018-04-15iio: potentiometer: mcp4531: switch to using .probe_newPeter Rosin
Use the new probe style for i2c drivers. Signed-off-by: Peter Rosin <peda@axentia.se> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2018-04-15iio: potentiometer: mcp4018: switch to using .probe_newPeter Rosin
Use the new probe style for i2c drivers. Signed-off-by: Peter Rosin <peda@axentia.se> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2018-03-10iio: potentiometer: mcp4018: driver for Microchip digital potentiometersPeter Rosin
Add support for Microchip digital potentiometers and rheostats MCP4017, MCP4018, MCP4019 They all have one wiper with 128 steps and come in 5, 10, 50 and 100 kOhm variations. Datasheet: http://www.microchip.com/downloads/en/DeviceDoc/22147a.pdf Signed-off-by: Peter Rosin <peda@axentia.se> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2018-03-10iio: potentiometer: ds1803: Remove VLA usageHimanshu Jha
In preparation to enabling -Wvla, remove VLA usage and replace it with fixed a fixed length array and therefore, prevent potential stack overflow attacks. Fixed as a part of the discussion to remove all VLAs from the kernel: https://lkml.org/lkml/2018/3/7/621 Cc: keescook@chromium.org Signed-off-by: Himanshu Jha <himanshujha199640@gmail.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2018-02-18iio: add SPDX identifier for various driversMatt Ranostay
Add GPLv2+ SPDX identifier and update email for author's drivers. Signed-off-by: Matt Ranostay <matt.ranostay@konsulko.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2018-02-10iio: ad5272: Add support for Analog Devices digital potentiometersPhil Reid
Add implementation for Analog Devices AD5272 and AD5274 digital potentiometer devices. Signed-off-by: Phil Reid <preid@electromag.com.au> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2017-11-13Merge tag 'staging-4.15-rc1' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging Pull staging and IIO updates from Greg KH: "Here is the "big" staging and IIO driver update for 4.15-rc1. Lots and lots of little changes, almost all minor code cleanups as the Outreachy application process happened during this development cycle. Also happened was a lot of IIO driver activity, and the typec USB code moving out of staging to drivers/usb (same commits are in the USB tree on a persistent branch to not cause merge issues.) Overall, it's a wash, I think we added a few hundred more lines than removed, but really only a few thousand were modified at all. All of these have been in linux-next for a while. There might be a merge issue with Al's vfs tree in the pi433 driver (take his changes, they are always better), and the media tree with some of the odd atomisp cleanups (take the media tree's version)" * tag 'staging-4.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging: (507 commits) staging: lustre: add SPDX identifiers to all lustre files staging: greybus: Remove redundant license text staging: greybus: add SPDX identifiers to all greybus driver files staging: ccree: simplify ioread/iowrite staging: ccree: simplify registers access staging: ccree: simplify error handling logic staging: ccree: remove dead code staging: ccree: handle limiting of DMA masks staging: ccree: copy IV to DMAable memory staging: fbtft: remove redundant initialization of buf staging: sm750fb: Fix parameter mistake in poke32 staging: wilc1000: Fix bssid buffer offset in Txq staging: fbtft: fb_ssd1331: fix mirrored display staging: android: Fix checkpatch.pl error staging: greybus: loopback: convert loopback to use generic async operations staging: greybus: operation: add private data with get/set accessors staging: greybus: loopback: Fix iteration count on async path staging: greybus: loopback: Hold per-connection mutex across operations staging: greybus/loopback: use ktime_get() for time intervals staging: fsl-dpaa2/eth: Extra headroom in RX buffers ...
2017-11-02License cleanup: add SPDX GPL-2.0 license identifier to files with no licenseGreg Kroah-Hartman
Many source files in the tree are missing licensing information, which makes it harder for compliance tools to determine the correct license. By default all files without license information are under the default license of the kernel, which is GPL version 2. Update the files which contain no license information with the 'GPL-2.0' SPDX license identifier. The SPDX identifier is a legally binding shorthand, which can be used instead of the full boiler plate text. This patch is based on work done by Thomas Gleixner and Kate Stewart and Philippe Ombredanne. How this work was done: Patches were generated and checked against linux-4.14-rc6 for a subset of the use cases: - file had no licensing information it it. - file was a */uapi/* one with no licensing information in it, - file was a */uapi/* one with existing licensing information, Further patches will be generated in subsequent months to fix up cases where non-standard license headers were used, and references to license had to be inferred by heuristics based on keywords. The analysis to determine which SPDX License Identifier to be applied to a file was done in a spreadsheet of side by side results from of the output of two independent scanners (ScanCode & Windriver) producing SPDX tag:value files created by Philippe Ombredanne. Philippe prepared the base worksheet, and did an initial spot review of a few 1000 files. The 4.13 kernel was the starting point of the analysis with 60,537 files assessed. Kate Stewart did a file by file comparison of the scanner results in the spreadsheet to determine which SPDX license identifier(s) to be applied to the file. She confirmed any determination that was not immediately clear with lawyers working with the Linux Foundation. Criteria used to select files for SPDX license identifier tagging was: - Files considered eligible had to be source code files. - Make and config files were included as candidates if they contained >5 lines of source - File already had some variant of a license header in it (even if <5 lines). All documentation files were explicitly excluded. The following heuristics were used to determine which SPDX license identifiers to apply. - when both scanners couldn't find any license traces, file was considered to have no license information in it, and the top level COPYING file license applied. For non */uapi/* files that summary was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 11139 and resulted in the first patch in this series. If that file was a */uapi/* path one, it was "GPL-2.0 WITH Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 WITH Linux-syscall-note 930 and resulted in the second patch in this series. - if a file had some form of licensing information in it, and was one of the */uapi/* ones, it was denoted with the Linux-syscall-note if any GPL family license was found in the file or had no licensing in it (per prior point). Results summary: SPDX license identifier # files ---------------------------------------------------|------ GPL-2.0 WITH Linux-syscall-note 270 GPL-2.0+ WITH Linux-syscall-note 169 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17 LGPL-2.1+ WITH Linux-syscall-note 15 GPL-1.0+ WITH Linux-syscall-note 14 ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5 LGPL-2.0+ WITH Linux-syscall-note 4 LGPL-2.1 WITH Linux-syscall-note 3 ((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3 ((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1 and that resulted in the third patch in this series. - when the two scanners agreed on the detected license(s), that became the concluded license(s). - when there was disagreement between the two scanners (one detected a license but the other didn't, or they both detected different licenses) a manual inspection of the file occurred. - In most cases a manual inspection of the information in the file resulted in a clear resolution of the license that should apply (and which scanner probably needed to revisit its heuristics). - When it was not immediately clear, the license identifier was confirmed with lawyers working with the Linux Foundation. - If there was any question as to the appropriate license identifier, the file was flagged for further research and to be revisited later in time. In total, over 70 hours of logged manual review was done on the spreadsheet to determine the SPDX license identifiers to apply to the source files by Kate, Philippe, Thomas and, in some cases, confirmation by lawyers working with the Linux Foundation. Kate also obtained a third independent scan of the 4.13 code base from FOSSology, and compared selected files where the other two scanners disagreed against that SPDX file, to see if there was new insights. The Windriver scanner is based on an older version of FOSSology in part, so they are related. Thomas did random spot checks in about 500 files from the spreadsheets for the uapi headers and agreed with SPDX license identifier in the files he inspected. For the non-uapi files Thomas did random spot checks in about 15000 files. In initial set of patches against 4.14-rc6, 3 files were found to have copy/paste license identifier errors, and have been fixed to reflect the correct identifier. Additionally Philippe spent 10 hours this week doing a detailed manual inspection and review of the 12,461 patched files from the initial patch version early this week with: - a full scancode scan run, collecting the matched texts, detected license ids and scores - reviewing anything where there was a license detected (about 500+ files) to ensure that the applied SPDX license was correct - reviewing anything where there was no detection but the patch license was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied SPDX license was correct This produced a worksheet with 20 files needing minor correction. This worksheet was then exported into 3 different .csv files for the different types of files to be modified. These .csv files were then reviewed by Greg. Thomas wrote a script to parse the csv files and add the proper SPDX tag to the file, in the format that the file expected. This script was further refined by Greg based on the output to detect more types of files automatically and to distinguish between header and source .c files (which need different comment types.) Finally Greg ran the script using the .csv files to generate the patches. Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-09-03iio:potentiometer:max5487: Drop explicit setting of module ownerJonathan Cameron
The SPI core has handled this for some time. Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
2017-09-03iio:potentiometer:max5481 drop explicit setting of the owner module.Jonathan Cameron
This has been handled by the spi core for some time. Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
2017-08-22iio:dpot: drop assign iio_info.driver_moduleJonathan Cameron
The equivalent of this is now done via macro magic when the relevant register call is made. The actual structure elements will shortly go away. Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
2017-01-28iio: max5481: Add support for Maxim digital potentiometersMatt Weber
Add implementation for Maxim Integrated 5481, 5482, 5483, and 5484 digital potentiometer devices. Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX5481-MAX5484.pdf Signed-off-by: Maury Anderson <maury.anderson@rockwellcollins.com> Signed-off-by: Matthew Weber <matthew.weber@rockwellcollins.com> Signed-off-by: Slawomir Stepien <sst@poczta.fm> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2017-01-22iio: potentiometer: mcp4531: Export OF device ID table as module aliasesJavier Martinez Canillas
The I2C core always reports a MODALIAS of the form i2c:<foo> even if the device was registered via OF, this means that exporting the OF device ID table device aliases in the module is not needed. But in order to change how the core reports modaliases to user-space, it's better to export it. Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2016-11-13iio: mcp4531: provide range of available raw valuesPeter Rosin
Example: $ cat '/sys/bus/iio/devices/iio:device0/out_resistance_raw_available' [0 1 256] Meaning: min 0, step 1 and max 256. Signed-off-by: Peter Rosin <peda@axentia.se> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2016-07-03iio: potentiometer: Fix typo in KconfigFlorian Vaussard
Fix s/potentiomenter/potentiometer/. Suggested-by: Peter Meerwald-Stadler <pmeerw@pmeerw.net> Signed-off-by: Florian Vaussard <florian.vaussard@heig-vd.ch> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2016-07-03iio: potentiometer: mcp4531: Add device tree bindingFlorian Vaussard
This patch adds the necessary device tree binding to allow DT probing of currently supported parts. Signed-off-by: Florian Vaussard <florian.vaussard@heig-vd.ch> Acked-by: Peter Rosin <peda@axentia.se> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2016-07-03iio: potentiometer: mcp4531: Add support for MCP454x, MCP456x, MCP464x and ↵Florian Vaussard
MCP466x This patch adds support for MCP454x, MCP456x, MCP464x and MCP466x parts. The main difference with currently supported parts (MCP453x and alike) is the addition of a non-volatile memory in order to recall the wiper setting at power-on. This feature is currently not supported and only the volatile memory is used to set the wiper. Signed-off-by: Florian Vaussard <florian.vaussard@heig-vd.ch> Acked-by: Peter Rosin <peda@axentia.se> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2016-05-21iio: max5487: Add support for Maxim digital potentiometersCristina Moraru
Add implementation for Maxim MAX5487, MAX5488, MAX5489 digital potentiometers. Datasheet: http://datasheets.maximintegrated.com/en/ds/MAX5487-MAX5489.pdf Signed-off-by: Cristina Moraru <cristina.moraru09@gmail.com> CC: Daniel Baluta <daniel.baluta@intel.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2016-05-14iio: potentiometer: tpl0102: remove unneeded i2c check functionality testMatt Ranostay
Actually I2C_FUNC_SMBUS_WORD_DATA isn't need for this device, and regmap handles all single byte reads transparently. Signed-off-by: Matt Ranostay <mranostay@gmail.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2016-04-10iio: potentiometer: add driver for Maxim Integrated DS1803Slawomir Stepien
The following functions are supported: - write, read potentiometer value - potentiometer scale Datasheet: https://datasheets.maximintegrated.com/en/ds/DS1803.pdf Signed-off-by: Slawomir Stepien <sst@poczta.fm> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2016-04-03iio: potentiometer: add driver for Microchip ↵Slawomir Stepien
MCP413X/414X/415X/416X/423X/424X/425X/426X The following functionalities are supported: - write, read from volatile memory Datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/22060b.pdf Signed-off-by: Slawomir Stepien <sst@poczta.fm> Reviewed-by: Joachim Eastwood <manabian@gmail.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2016-04-03iio: potentiometer: mcp4531: use pointer to access model parametersSlawomir Stepien
Use const pointer to element from model configuration array rather then array index, as it will not change anyway. Signed-off-by: Slawomir Stepien <sst@poczta.fm> Signed-off-by: Peter Rosin <peda@axentia.se> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2016-03-05iio: potentiometer: tpl0102: change i2c functionality return codeMatt Ranostay
Change i2c_check_functionality condition check return from ENOTSUPP to EOPNOTSUPP which is now the standard return code. Signed-off-by: Matt Ranostay <mranostay@gmail.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2016-02-27iio: convert to common i2c_check_functionality() return valueMatt Ranostay
Previously most drivers that used a i2c_check_functionality() check condition required various error codes on failure. This patchset converts to a standard of -EOPNOTSUPP Signed-off-by: Matt Ranostay <mranostay@gmail.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2016-02-24iio: potentiometer: add TI tpl0102 supportMatt Ranostay
Add support for the TI family of digital potentiometers. Signed-off-by: Matt Ranostay <mranostay@gmail.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2015-09-30iio: mcp4531: Driver for Microchip digital potentiometersPeter Rosin
Add support for Microchip digital potentiometers and rheostats MCP4531, MCP4532, MCP4551, MCP4552 MCP4631, MCP4632, MCP4651, MCP4652 DEVICE Wipers Steps Resistor Opts (kOhm) i2c address MCP4531 1 129 5, 10, 50, 100 010111x MCP4532 1 129 5, 10, 50, 100 01011xx MCP4551 1 257 5, 10, 50, 100 010111x MCP4552 1 257 5, 10, 50, 100 01011xx MCP4631 2 129 5, 10, 50, 100 0101xxx MCP4632 2 129 5, 10, 50, 100 01011xx MCP4651 2 257 5, 10, 50, 100 0101xxx MCP4652 2 257 5, 10, 50, 100 01011xx Datasheet: http://www.microchip.com/downloads/en/DeviceDoc/22096b.pdf Signed-off-by: Peter Rosin <peda@axentia.se> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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