- 15 Aug, 2022 36 commits
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Nuno Sá authored
This moves the IIO in kernel interface to use fwnode properties and thus be firmware agnostic. Note that the interface is still not firmware agnostic. At this point we have both OF and fwnode interfaces so that we don't break any user. On top of this we also want to have a per driver conversion and that is the main reason we have both of_xlate() and fwnode_xlate() support. Signed-off-by:
Nuno Sá <nuno.sa@analog.com> Reviewed-by:
Andy Shevchenko <andy.shevchenko@gmail.com> Link: https://lore.kernel.org/r/20220715122903.332535-6-nuno.sa@analog.comSigned-off-by:
Jonathan Cameron <Jonathan.Cameron@huawei.com>
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Nuno Sá authored
This change splits of_iio_channel_get_by_name() so that it decouples looking for channels in the current node from looking in it's parents nodes. This will be helpful when moving to fwnode properties where we need to release the handles when looking for channels in parent's nodes. No functional change intended... Signed-off-by:
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Nuno Sá authored
APIs like of_iio_channel_get_by_name() and of_iio_channel_get_all() were returning a mix of NULL and pointers with NULL being the way to "notify" that we should do a "system" lookup for channels. This make it very confusing and prone to errors as commit 9f63cc0921ec ("iio: inkern: fix return value in devm_of_iio_channel_get_by_name()") proves. On top of this, patterns like 'if (channel != NULL) return channel' were being used where channel could actually be an error code which makes the code hard to read. This change also makes some functional changes on how errors were being handled. In the original behavior, even if we get an error like '-ENOMEM', we still continue with the search. We should only continue to lookup for the channel when it makes sense to do so. Hence, the main error handling in 'of_iio_channel_get_by_name()' is changed to the following logic: * If a channel 'name' is provided and we do find it via 'io-channel-names', we should be able to get it. If we get any error, we should not proceed with the lookup. Moreover, we should return an error so that callers won't proceed with a system lookup. * If a channel 'name' is provided and we cannot find it ('index < 0'), 'of_parse_phandle_with_args()' is expected to fail with '-EINVAL'. Hence, we should only continue if we get that error. * If a channel 'name' is not provided we should only carry on with the search if 'of_parse_phandle_with_args()' returns '-ENOENT'. Also note that a system channel lookup is only done if the returned error code (from 'of_iio_channel_get_by_name()' or 'of_iio_channel_get_all()' is -ENODEV. Signed-off-by: -
Nuno Sá authored
of_iio_channel_get_by_name() can either return NULL or an error pointer so that only doing IS_ERR() is not enough. Fix it by checking the NULL pointer case and return -ENODEV in that case. Note this is done like this so that users of the function (which only check for error pointers) do not need to be changed. This is not ideal since we are losing error codes and as such, in a follow up change, things will be unified so that of_iio_channel_get_by_name() only returns error codes. Fixes: 6e39b145 ("iio: provide of_iio_channel_get_by_name() and devm_ version it") Signed-off-by:
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Nuno Sá authored
'of_node_put()' can potentially release the memory pointed to by 'iiospec.np' which would leave us with an invalid pointer (and we would still pass it in 'of_xlate()'). Note that it is not guaranteed for the of_node lifespan to be attached to the device (to which is attached) lifespan so that there is (even though very unlikely) the possibility for the node to be freed while the device is still around. Thus, as there are indeed some of_xlate users which do access the node, a race is indeed possible. As such, we can only release the node after we are done with it. Fixes: 17d82b47 ("iio: Add OF support") Signed-off-by:
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Marijn Suijten authored
These channels are specified in downstream kernels [1] and actively used by e.g. the Sony Seine platform on the SM6125 SoC. Note that GPIO2 isn't used on this platform and, while the definition downstream is identical to the other GPIOx_100K_PU definitions, has been omitted for lack of proper testing. [1]: https://source.codeaurora.org/quic/la/kernel/msm-4.14/tree/drivers/iio/adc/qcom-spmi-adc5.c?h=LA.UM.7.11.r1-05200-NICOBAR.0#n688Signed-off-by:
Marijn Suijten <marijn.suijten@somainline.org> Reviewed-by:
AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org> Link: https://lore.kernel.org/r/20220805135729.1037079-3-marijn.suijten@somainline.orgSigned-off-by:
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Claudiu Beznea authored
Add runtime PM support by disabling/enabling ADC's peripheral clock. On simple conversion the ADC's clock is kept enabled just while the conversion is in progress. This includes also temperature conversion. For triggered buffers and touch conversions the ADC clock is kept enabled while the triggered buffers or touch are enabled. Along with it removed the __maybe_unused on suspend() and resume() ops as the dev_pm_ops object members are now filled with SYSTEM_SLEEP_PM_OPS(). Signed-off-by:
Claudiu Beznea <claudiu.beznea@microchip.com> Link: https://lore.kernel.org/r/20220803102855.2191070-20-claudiu.beznea@microchip.comSigned-off-by:
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Claudiu Beznea authored
Add empty line after function. Signed-off-by:
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Claudiu Beznea authored
The ADC on SAMA7G5 has a dedicated channel (channel 31) for measuring in-SoC temperature. 2 inputs are multiplexed on channel 31, VTEMP and VBG as follows: ` | \ +-----+ VBG --->| | ch31 | | Vtemp --->| |----->| ADC | | / | | | / +-----+ . where: - VTEMP is proportional to the absolute temperature voltage - VBG is a quasi-temperature independent voltage Both VBG and VTEMP are needed to determine the correct in-SoC temperature. At a moment of time only one of these could be measured, the selection being done with bit SRCLCH bit of ACR register. The formula to calculate the temperature is as follows: P1 + (Vref * (VTEMP - P6 - P4 * VBG)) / (VBG * VTEMP_DT) where: - P1, P4, P6 are calibration data retrieved from OTP memory - Vref is the reference voltage for ADC - VTEMP_DT is the voltage sensitivity to temperature and is constant - VTEMP, VBG are the measured values from channel 31 For better resolution before reading the temperature certain settings for oversampling ratio, sample frequency, EMR.TRACKX, MR.TRACKTIM are applied. The initial settings are reapplied at the end of temperature reading. Current support is not integrated with trigger buffers channel 31 not being enabled/disabled in functions at91_adc_buffer_prepare(), at91_adc_buffer_postdisable() thus the conversion for channel 31 is not done in case trigger buffers are enabled. In case of trigger buffers are enabled and temperature requests are received in the driver though at91_adc_read_temp() the at91_adc_read_temp() will return with an error code. Signed-off-by: -
Claudiu Beznea authored
Add ID for temperature channel of AT91 SAMA5D2 ADC. Signed-off-by:
Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/20220803102855.2191070-17-claudiu.beznea@microchip.comSigned-off-by:
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Claudiu Beznea authored
Remove iio_device_{claim, release}_direct_mode() and lock/unlock to &st->lock from at91_adc_read_info_raw(). Instead add a wrapper around at91_adc_read_info_raw() and do there the lock/unlock. This will allow using the at91_adc_read_info_raw() in patch that add support for temperature sensor. Signed-off-by: -
Claudiu Beznea authored
Add startup and tracktim as parameter for at91_adc_setup_samp_freq() function. In case of temperature sensor being enabled these parameters will be configured on temperature read request to improve the accuracy of the read temperature. Signed-off-by:
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Claudiu Beznea authored
Add support for updating trackx bits of EMR register. Having different values of EMR.TRACKX when measuring temperature give a better accuracy. Signed-off-by:
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Claudiu Beznea authored
Move the storage of oversampling_ratio in at91_adc_config_emr(). This prepares for the next commits. Signed-off-by:
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Claudiu Beznea authored
Add 64 and 256 oversampling ratio support. It is necessary for temperature sensor. Signed-off-by:
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Claudiu Beznea authored
ADC captures data on 12 bits (if oversampling is not enabled). When using oversampling captured data could go up to 14 bits for SAMA5D2 or up to 16 bits for SAMA7G5 (depending on oversampling settings). All the channels that are subject of oversampling are registered as 14 or 16 real bits. Depending on the oversampling settings the ADC converted value need to be shifted up to 14 or 16 to cope with realbits value registered to IIO subsystem. Commit adds platform specific information to know if we run on a system with up to 14 or 16 bits ADC converted data. Signed-off-by:
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Claudiu Beznea authored
Add .read_avail() to chan_info ops which will retrieve the available oversampling ratio. Suggested-by:
Jonathan Cameron <jic23@kernel.org> Signed-off-by:
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Claudiu Beznea authored
Drop AT91_OSR_1SAMPLES, AT91_OSR_4SAMPLES, AT91_OSR_16SAMPLES defines and insted use their values inline. Suggested-by:
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Claudiu Beznea authored
Oversampling values are checked anyway in at91_adc_emr_config(). Remove the checking of these from at91_adc_write_raw() and return -EINVAL instead in at91_adc_emr_config(). Suggested-by:
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Claudiu Beznea authored
SAMA7G5 introduces 64 and 256 oversampling rates. Due to this EMR.OSR is 3 bits long. Change the code to reflect this. Commit prepares the code for the addition of 64 and 256 oversampling rates. Signed-off-by:
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Claudiu Beznea authored
When buffers are enabled conversion may start asynchronously thus allowing changes on actual hardware could lead to bad behavior. Thus do not allow changing oversampling ratio and sample frequency when if iio_device_claim_direct_mode() returns with error. Signed-off-by:
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Claudiu Beznea authored
In case triggered buffers are enabled while system is suspended they will not work anymore after resume. For this call at91_adc_buffer_postdisable() on suspend and at91_adc_buffer_prepare() on resume. On tests it has been seen that at91_adc_buffer_postdisable() call is not necessary but it has been kept because it also does the book keeping for DMA. On resume path there is no need to call at91_adc_configure_touch() as it is embedded in at91_adc_buffer_prepare(). Fixes: 073c6620 ("iio: adc: at91-sama5d2_adc: add support for DMA") Signed-off-by:
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Claudiu Beznea authored
.read_raw()/.write_raw() could be called asynchronously from user space or other in kernel drivers. Without locking on st->lock these could be called asynchronously while there is a conversion in progress. Read will be harmless but changing registers while conversion is in progress may lead to inconsistent results. Thus, to avoid this lock st->lock. Fixes: 27e17719 ("iio:adc:at91_adc8xx: introduce new atmel adc driver") Fixes: 6794e23f ("iio: adc: at91-sama5d2_adc: add support for oversampling resolution") Signed-off-by:
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Claudiu Beznea authored
Check return status of at91_adc_read_position() and at91_adc_read_pressure() in at91_adc_read_info_raw(). Fixes: 6794e23f ("iio: adc: at91-sama5d2_adc: add support for oversampling resolution") Signed-off-by:
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Claudiu Beznea authored
All ADC HW versions handled by this driver (SAMA5D2, SAM9X60, SAMA7G5) have MR.TRACKTIM on 4 bits. Fix AT91_SAMA5D2_MR_TRACKTIM_MAX to reflect this. Fixes: 27e17719 ("iio:adc:at91_adc8xx: introduce new atmel adc driver") Signed-off-by:
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Joe Simmons-Talbott authored
As reported by checkpatch.pl add missing names for function definition arguments. Signed-off-by:
Joe Simmons-Talbott <joetalbott@gmail.com> Link: https://lore.kernel.org/r/20220731160120.4831-1-joetalbott@gmail.comSigned-off-by:
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ChiYuan Huang authored
Add documentation for the usage of voltage channel integration time. Signed-off-by:
ChiYuan Huang <cy_huang@richtek.com> Link: https://lore.kernel.org/r/1658242365-27797-4-git-send-email-u0084500@gmail.comSigned-off-by:
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ChiYuan Huang authored
Add Richtek rtq6056 supporting. It can be used for the system to monitor load current and power with 16-bit resolution. Signed-off-by:
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ChiYuan Huang authored
Add the documentation for Richtek rtq6056. Signed-off-by:
Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Link: https://lore.kernel.org/r/1658242365-27797-2-git-send-email-u0084500@gmail.comSigned-off-by:
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Shreeya Patel authored
Add initial support for ltrf216a ambient light sensor. Datasheet: https://gitlab.collabora.com/shreeya/iio/-/blob/master/LTRF216A.pdfReviewed-by:
Zhigang Shi <Zhigang.Shi@liteon.com> Signed-off-by:
Dmitry Osipenko <dmitry.osipenko@collabora.com> Signed-off-by:
Shreeya Patel <shreeya.patel@collabora.com> Link: https://lore.kernel.org/r/20220725104050.491396-3-shreeya.patel@collabora.comSigned-off-by:
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Shreeya Patel authored
Add devicetree bindings for ltrf216a ambient light sensor. Reviewed-by:
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Martin Larsson authored
If the ADC vref regulator returns an error, for example, if CONFIG_REGULATOR is not set, the error will be used as a reference voltage. Introduce a guard for negative return values instead of unconditionally casting it to u32. Acked-by:
Haibo Chen <haibo.chen@nxp.com> Signed-off-by:
Martin Larsson <martin.larsson@actia.se> Reviewed-by:
Fabio Estevam <festevam@gmail.com> Link: https://lore.kernel.org/r/20220720153136.3502440-1-martin.larsson@actia.seSigned-off-by:
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Marcus Folkesson authored
The actual status of the code is Maintained. Signed-off-by:
Marcus Folkesson <marcus.folkesson@gmail.com> Cc: Kent Gustavsson <kent@minoris.se> Cc: Jonathan Cameron <jic23@kernel.org> Cc: linux-iio <linux-iio@vger.kernel.org> Link: https://lore.kernel.org/r/20220723092030.260812-1-marcus.folkesson@gmail.comSigned-off-by:
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Krzysztof Kozlowski authored
Document the ti,am654-adc compatible already used in DTS: arch/arm64/boot/dts/ti/k3-am642-evm.dtb: adc: compatible:0: 'ti,am654-adc' is not one of ['ti,am3359-adc', 'ti,am4372-adc'] Signed-off-by:
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Joe Simmons-Talbott authored
As reported by checkpatch.pl make indentation match previous conditional. Signed-off-by:
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Joe Simmons-Talbott authored
As reported by checkpatch.pl add blank lines after declarations. Signed-off-by:
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- 14 Aug, 2022 4 commits
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Linus Torvalds authored
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Yury Norov authored
Radix tree header includes gfp.h for __GFP_BITS_SHIFT only. Now we have gfp_types.h for this. Fixes powerpc allmodconfig build: In file included from include/linux/nodemask.h:97, from include/linux/mmzone.h:17, from include/linux/gfp.h:7, from include/linux/radix-tree.h:12, from include/linux/idr.h:15, from include/linux/kernfs.h:12, from include/linux/sysfs.h:16, from include/linux/kobject.h:20, from include/linux/pci.h:35, from arch/powerpc/kernel/prom_init.c:24: include/linux/random.h: In function 'add_latent_entropy': >> include/linux/random.h:25:46: error: 'latent_entropy' undeclared (first use in this function); did you mean 'add_latent_entropy'? 25 | add_device_randomness((const void *)&latent_entropy, sizeof(latent_entropy)); | ^~~~~~~~~~~~~~ | add_latent_entropy include/linux/random.h:25:46: note: each undeclared identifier is reported only once for each function it appears in Reported-by:kernel test robot <lkp@intel.com> CC: Andy Shevchenko <andriy.shevchenko@linux.intel.com> CC: Andrew Morton <akpm@linux-foundation.org> CC: Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by:
Yury Norov <yury.norov@gmail.com> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfsLinus Torvalds authored
Pull vfs lseek fix from Al Viro: "Fix proc_reg_llseek() breakage. Always had been possible if somebody left NULL ->proc_lseek, became a practical issue now" * tag 'pull-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: take care to handle NULL ->proc_lseek()
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Al Viro authored
Easily done now, just by clearing FMODE_LSEEK in ->f_mode during proc_reg_open() for such entries. Fixes: 868941b1 "fs: remove no_llseek" Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk>
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