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Author SHA1 Message Date
Greg Kroah-Hartman
0ca7cb7089 IIO: New device support, features and cleanup for 6.16 - take 2 
Note - last minute rebase was to drop a typo patch that I'd accidentally
 picked up (in the microblaze arch Kconfig)
 Take 2 is due to that rebase messing up some fixes tags that were
 referring to patches after that point.
 
 There is a known merge conflict due to changes in neighbouring lines.
 
 Stephen's resolution in linux-next is:
 https://lore.kernel.org/linux-next/20250506155728.65605bae@canb.auug.org.au/
 
 Added 3 named IIO reviewers to MAINTAINERS. This is a reflection of those
 who have been doing much of this work for some time. Lars-Peter is
 removed from the entry having moved on to other topics.  Thanks
 Nuno, David and Andy for stepping up and Lars-Peter for all your
 hard work in the past!
 
 Includes the usual mix of new device support, features and general
 cleanup.
 
 This time we also have some tree wide changes.
 
 - Rip out the iio_device_claim_direct_scoped() as it proved hard to work
   with.  This series includes quite a few related cleanups such as use
   of guard or factoring code out to allow direct returns.
 - Switch from iio_device_claim/release_direct_mode() to new
   iio_device_claim/release_direct() which is structured so that sparse
   can warn on failed releases. There were a few false positives but
   those were mostly in code that benefited from being cleaned up as part
   of this process.
 - Introduce iio_push_to_buffers_with_ts() to replace the _timestamp()
   version over time. This version takes the size of the supplied buffer
   which the core checks is at least as big as expected by calculation
   from channel descriptions of those channels enabled. Use this in
   an initial set of drivers.
 - Add macros for IIO_DECLARE_BUFFER_WITH_TS() and
   IIO_DECLARE_DMA_BUFFER_WITH_TS() to avoid lots of fiddly code to ensure
   correctly aligned buffers for timestamps being added onto the end of
   channel data.
 
 New device support
 ------------------
 
 adi,ad3530r
 - New driver for AD3530, AD3530R, AD3531 and AD3531R DACs with
   programmable gain controls. R variants have internal references.
 adi,ad7476
 - Add support (dt compatible only) for the Rohm BU79100G ADC which is
   fully compatible with the ti,ads7866.
 adi,ad7606
 - Support ad7606c-16 and ad7606c-18 devices. Includes switch to dynamic
   channel information allocation.
 adi,ad7380
 - Add support for the AD7389-4
 dfrobot,sen0322
 - New driver for this oxygen sensor.
 mediatek,mt2701-auxadc
 - Add binding for MT6893 which is fully compatible with already supported
   MT8173.
 meson-saradc
 - Support the GXLX SoCs.  Mostly this is a workaround for some unrelated
   clock control bits found in the ADC register map.
 nuvoton,nct7201
 - New driver for NCT7201 and NCT7202 I2C ADCs.
 rohm,bd79124
 - New driver for this 12-bit, 8-channel SAR ADC.
 - Switch to new set_rv etc gpio callbacks that were added in 6.15.
 rohm,bd79703
 - Add support for BD79700, BD79701 and BD79702 DACs that have subsets of
   functionality of the already supported bd79703.  Included making this
   driver suitable for support device variants.
 st,stm32-lptimer
 - Add support for stm32pm25 to this trigger.
 
 Features
 --------
 
 Beyond IIO
 - Property iterator for named children.
 core
 - Enable writes for 64 bit integers used for standard IIO ABI elements.
   Previously these could be read only.
 - Helper library that should avoid code duplication for simpler ADC
   bindings that have a child node per channel.
 - Enforce that IIO_DMA_MINALIGN is always at least 8 (almost always true
   and simplifies code on all significant architectures)
 core/backend
 - Add support to control source of data - useful when the HDL includes
   things like generated ramps for testing purposes. Enable this for
   adi-axi-dac
 adi,ad3552-hs
 - Add debugfs related callbacks to allow debug access to register contents.
 adi,ad4000
 - Support SPI offload with appropriate FPGA firmware along with improving
   documentation.
 adi,ad7293
 - Add support for external reference voltage.
 adi,ad7606
 - Support SPI offload.
 adi,ad7768-1
 - Support reset GPIO.
 adi,admv8818
 - Support filter frequencies beyond 2^32.
 adi,adxl345
 - Add single and double tap events.
 hid-sensor-prox
 - Support 16-bit report sizes as seen on some Intel platforms.
 invensense,icm42600
 - Enable use of named interrupts to avoid problems with some wiring choices.
   Get the interrupt by name, but fallback to previous assumption on the first
   being INT1 if no names are supplied.
 microchip,mcp3911
 - Add reset gpio support.
 rohm,bh7150
 - Add reset gpio support.
 st,stm32
 - Add support to control oversampling.
 ti,adc128s052
 - Add support for ROHM BD79104 which is early compatible with the TI
   parts already supported by this driver. Includes some general driver
   cleanup and a separate dt binding.
 - Simplify reference voltage handling by assuming it is fixed after enabling
   the supply.
 winsen,mhz19b
 - New driver for this C02 sensor.
 
 Cleanup and minor fixes
 -----------------------
 
 dt-bindings
 - Correct indentation and style for DTS examples.
 - Use unevalutateProperties for SPI devices instead of additionalProperties
   to allow generic SPI properties from spi-peripheral-props.yaml
 ABI Docs
 - Add missing docs for sampling_frequency when it applies only to events.
 Treewide
 - Various minor tweaks, comment fixes and similar.
 - Sort TI ADCs in Kconfig that had gotten out of order.
 - Switch various drives that provide GPIO chip functionality to the new
   callbacks with return values.
 - Standardize on { } formatting for all array sentinels.
 - Make use of aligned_s64 in a few places to replace either wrong types
   or manually defined equivalents.
 - Drop places where spi bits_per_word is set to 8 because that is the
   default anyway.
 
 adi,ad_sigma_delta library
 - Avoid a potential use of uninitialized data if reg_size has a value
   that is not supported (no drivers hit this but it is reasonable hardening)
 adi,ad4030
 - Add error checking for scan types and no longer store it in state.
 - Rework code to reduce duplication.
 - Move setting the mode from buffer preenable() to update_scan_mode(),
   better matching expected semantics of the two different callbacks.
 - Improve data marshalling comments.
 adi,ad4695
 - Use u16 for buffer elements as oversampling is not yet supported except
   with SPI offload (which doesn't use this path).
 adi,ad5592r
 - Clean up destruction of mutexes.
 - Use lock guards to simplify code (later patch fixes a missed unlock)
 adi,ad5933
 - Correct some incorrect settling times.
 adi,ad7091
 - Deduplicate handling of writable vs volatile registers as they are the
   inverse of each other for this device.
 adi,ad7124
 - Fix 3db Filter frequency.
 - Remove ability to directly write the filter frequency (which was broken)
 - Register naming improvements.
 adi,ad7606
 - Add a missing return value check.
 - Fill in max sampling rates for all chips.
 - Use devm_mutex_init()
 - Fix up some kernel-doc formatting issues.
 - Remove some camel case that snuck in.
 - Drop setting address field in channels as easily established from other
   fields.
 - Drop unnecessary parameter to ad76060_scale_setup_cb_t.
 adi,ad7768-1
 - Convert to regmap.
 - Factor out buffer allocation.
 - Tidy up headers.
 adi,ad7944
 - Stop setting bits_per_word in SPI xfers with no data.
 adi,ad9832
 - Add of_device_id table rather than just relying on fallbacks.
 - Use FIELD_PREP() to set values of fields.
 adi,admv1013
 - Cleanup a pointless ternary.
 adi,admv8818
 - Fix up LPF Band 5 frequency which was slightly wrong.
 - Fix an integer overflow.
 - Fix range calculation
 adi,adt7316
 - Replace irqd_get_trigger_type(irq_get_irq_data()) with simpler
   irq_get_trigger_type()
 adi,adxl345
 - Use regmap cache instead of various state variables that were there to
   reduce bus accesses.
 - Make regmap return value checking consistent across all call sites.
 adi,axi-dac
 - Add a check on number of channels (0 to 15 valid)
 allwinner,sun20i
 - Use new adc-helpers to replace local parsing code for channel nodes.
 bosch,bmp290
 - Move to local variables for sensor data marshalling removing the need
   for a messy definition that has to work for all supported parts.
   Follow up fix adds a missing initialization.
 dynaimage,al3010 and dynaimage,al3320a
 - Various minor cleanup to bring these drivers inline with reviewed feedback
   given on a new driver.
 - Fix an error path in which power down is not called when it should be.
 - Switch to regmap.
 google,cros_ec
 - Fix up a flexible array in middle of structure warning.
 - Flush fifo when changing the timeout to avoid potential long wait
   for samples.
 hid-sensor-rotation
 - Remove an __aligned(16) marking that doesn't seem to be justified.
 kionix,kxcjk-1013
 - Deduplicate code for setting up interrupts.
 microchip,mcp3911
 - Fix handling of conversion results register which differs across supported
   devices.
 idt,zopt2201
 - Avoid duplicating register lists as all volatile registers are the
   inverse of writeable registers on this device.
 renesas,rzg2l
 - Use new adc-helpers to replace local parsing code for channel nodes.
 ti,ads1298
 - Fix a missing Kconfig dependency.
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Merge tag 'iio-for-6.16a-take2' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/jic23/iio into char-misc-next

Jonathan writes:

IIO: New device support, features and cleanup for 6.16 - take 2

Note - last minute rebase was to drop a typo patch that I'd accidentally
picked up (in the microblaze arch Kconfig)
Take 2 is due to that rebase messing up some fixes tags that were
referring to patches after that point.

There is a known merge conflict due to changes in neighbouring lines.

Stephen's resolution in linux-next is:
https://lore.kernel.org/linux-next/20250506155728.65605bae@canb.auug.org.au/

Added 3 named IIO reviewers to MAINTAINERS. This is a reflection of those
who have been doing much of this work for some time. Lars-Peter is
removed from the entry having moved on to other topics.  Thanks
Nuno, David and Andy for stepping up and Lars-Peter for all your
hard work in the past!

Includes the usual mix of new device support, features and general
cleanup.

This time we also have some tree wide changes.

- Rip out the iio_device_claim_direct_scoped() as it proved hard to work
  with.  This series includes quite a few related cleanups such as use
  of guard or factoring code out to allow direct returns.
- Switch from iio_device_claim/release_direct_mode() to new
  iio_device_claim/release_direct() which is structured so that sparse
  can warn on failed releases. There were a few false positives but
  those were mostly in code that benefited from being cleaned up as part
  of this process.
- Introduce iio_push_to_buffers_with_ts() to replace the _timestamp()
  version over time. This version takes the size of the supplied buffer
  which the core checks is at least as big as expected by calculation
  from channel descriptions of those channels enabled. Use this in
  an initial set of drivers.
- Add macros for IIO_DECLARE_BUFFER_WITH_TS() and
  IIO_DECLARE_DMA_BUFFER_WITH_TS() to avoid lots of fiddly code to ensure
  correctly aligned buffers for timestamps being added onto the end of
  channel data.

New device support
------------------

adi,ad3530r
- New driver for AD3530, AD3530R, AD3531 and AD3531R DACs with
  programmable gain controls. R variants have internal references.
adi,ad7476
- Add support (dt compatible only) for the Rohm BU79100G ADC which is
  fully compatible with the ti,ads7866.
adi,ad7606
- Support ad7606c-16 and ad7606c-18 devices. Includes switch to dynamic
  channel information allocation.
adi,ad7380
- Add support for the AD7389-4
dfrobot,sen0322
- New driver for this oxygen sensor.
mediatek,mt2701-auxadc
- Add binding for MT6893 which is fully compatible with already supported
  MT8173.
meson-saradc
- Support the GXLX SoCs.  Mostly this is a workaround for some unrelated
  clock control bits found in the ADC register map.
nuvoton,nct7201
- New driver for NCT7201 and NCT7202 I2C ADCs.
rohm,bd79124
- New driver for this 12-bit, 8-channel SAR ADC.
- Switch to new set_rv etc gpio callbacks that were added in 6.15.
rohm,bd79703
- Add support for BD79700, BD79701 and BD79702 DACs that have subsets of
  functionality of the already supported bd79703.  Included making this
  driver suitable for support device variants.
st,stm32-lptimer
- Add support for stm32pm25 to this trigger.

Features
--------

Beyond IIO
- Property iterator for named children.
core
- Enable writes for 64 bit integers used for standard IIO ABI elements.
  Previously these could be read only.
- Helper library that should avoid code duplication for simpler ADC
  bindings that have a child node per channel.
- Enforce that IIO_DMA_MINALIGN is always at least 8 (almost always true
  and simplifies code on all significant architectures)
core/backend
- Add support to control source of data - useful when the HDL includes
  things like generated ramps for testing purposes. Enable this for
  adi-axi-dac
adi,ad3552-hs
- Add debugfs related callbacks to allow debug access to register contents.
adi,ad4000
- Support SPI offload with appropriate FPGA firmware along with improving
  documentation.
adi,ad7293
- Add support for external reference voltage.
adi,ad7606
- Support SPI offload.
adi,ad7768-1
- Support reset GPIO.
adi,admv8818
- Support filter frequencies beyond 2^32.
adi,adxl345
- Add single and double tap events.
hid-sensor-prox
- Support 16-bit report sizes as seen on some Intel platforms.
invensense,icm42600
- Enable use of named interrupts to avoid problems with some wiring choices.
  Get the interrupt by name, but fallback to previous assumption on the first
  being INT1 if no names are supplied.
microchip,mcp3911
- Add reset gpio support.
rohm,bh7150
- Add reset gpio support.
st,stm32
- Add support to control oversampling.
ti,adc128s052
- Add support for ROHM BD79104 which is early compatible with the TI
  parts already supported by this driver. Includes some general driver
  cleanup and a separate dt binding.
- Simplify reference voltage handling by assuming it is fixed after enabling
  the supply.
winsen,mhz19b
- New driver for this C02 sensor.

Cleanup and minor fixes
-----------------------

dt-bindings
- Correct indentation and style for DTS examples.
- Use unevalutateProperties for SPI devices instead of additionalProperties
  to allow generic SPI properties from spi-peripheral-props.yaml
ABI Docs
- Add missing docs for sampling_frequency when it applies only to events.
Treewide
- Various minor tweaks, comment fixes and similar.
- Sort TI ADCs in Kconfig that had gotten out of order.
- Switch various drives that provide GPIO chip functionality to the new
  callbacks with return values.
- Standardize on { } formatting for all array sentinels.
- Make use of aligned_s64 in a few places to replace either wrong types
  or manually defined equivalents.
- Drop places where spi bits_per_word is set to 8 because that is the
  default anyway.

adi,ad_sigma_delta library
- Avoid a potential use of uninitialized data if reg_size has a value
  that is not supported (no drivers hit this but it is reasonable hardening)
adi,ad4030
- Add error checking for scan types and no longer store it in state.
- Rework code to reduce duplication.
- Move setting the mode from buffer preenable() to update_scan_mode(),
  better matching expected semantics of the two different callbacks.
- Improve data marshalling comments.
adi,ad4695
- Use u16 for buffer elements as oversampling is not yet supported except
  with SPI offload (which doesn't use this path).
adi,ad5592r
- Clean up destruction of mutexes.
- Use lock guards to simplify code (later patch fixes a missed unlock)
adi,ad5933
- Correct some incorrect settling times.
adi,ad7091
- Deduplicate handling of writable vs volatile registers as they are the
  inverse of each other for this device.
adi,ad7124
- Fix 3db Filter frequency.
- Remove ability to directly write the filter frequency (which was broken)
- Register naming improvements.
adi,ad7606
- Add a missing return value check.
- Fill in max sampling rates for all chips.
- Use devm_mutex_init()
- Fix up some kernel-doc formatting issues.
- Remove some camel case that snuck in.
- Drop setting address field in channels as easily established from other
  fields.
- Drop unnecessary parameter to ad76060_scale_setup_cb_t.
adi,ad7768-1
- Convert to regmap.
- Factor out buffer allocation.
- Tidy up headers.
adi,ad7944
- Stop setting bits_per_word in SPI xfers with no data.
adi,ad9832
- Add of_device_id table rather than just relying on fallbacks.
- Use FIELD_PREP() to set values of fields.
adi,admv1013
- Cleanup a pointless ternary.
adi,admv8818
- Fix up LPF Band 5 frequency which was slightly wrong.
- Fix an integer overflow.
- Fix range calculation
adi,adt7316
- Replace irqd_get_trigger_type(irq_get_irq_data()) with simpler
  irq_get_trigger_type()
adi,adxl345
- Use regmap cache instead of various state variables that were there to
  reduce bus accesses.
- Make regmap return value checking consistent across all call sites.
adi,axi-dac
- Add a check on number of channels (0 to 15 valid)
allwinner,sun20i
- Use new adc-helpers to replace local parsing code for channel nodes.
bosch,bmp290
- Move to local variables for sensor data marshalling removing the need
  for a messy definition that has to work for all supported parts.
  Follow up fix adds a missing initialization.
dynaimage,al3010 and dynaimage,al3320a
- Various minor cleanup to bring these drivers inline with reviewed feedback
  given on a new driver.
- Fix an error path in which power down is not called when it should be.
- Switch to regmap.
google,cros_ec
- Fix up a flexible array in middle of structure warning.
- Flush fifo when changing the timeout to avoid potential long wait
  for samples.
hid-sensor-rotation
- Remove an __aligned(16) marking that doesn't seem to be justified.
kionix,kxcjk-1013
- Deduplicate code for setting up interrupts.
microchip,mcp3911
- Fix handling of conversion results register which differs across supported
  devices.
idt,zopt2201
- Avoid duplicating register lists as all volatile registers are the
  inverse of writeable registers on this device.
renesas,rzg2l
- Use new adc-helpers to replace local parsing code for channel nodes.
ti,ads1298
- Fix a missing Kconfig dependency.

* tag 'iio-for-6.16a-take2' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/jic23/iio: (260 commits)
  dt-bindings: iio: adc: Add ROHM BD79100G
  iio: adc: add support for Nuvoton NCT7201
  dt-bindings: iio: adc: add NCT7201 ADCs
  iio: chemical: Add driver for SEN0322
  dt-bindings: trivial-devices: Document SEN0322
  iio: adc: ad7768-1: reorganize driver headers
  iio: bmp280: zero-init buffer
  iio: ssp_sensors: optimalize -> optimize
  HID: sensor-hub: Fix typo and improve documentation
  iio: admv1013: replace redundant ternary operator with just len
  iio: chemical: mhz19b: Fix error code in probe()
  iio: adc: at91-sama5d2: use IIO_DECLARE_BUFFER_WITH_TS
  iio: accel: sca3300: use IIO_DECLARE_BUFFER_WITH_TS
  iio: adc: ad7380: use IIO_DECLARE_DMA_BUFFER_WITH_TS
  iio: adc: ad4695: rename AD4695_MAX_VIN_CHANNELS
  iio: adc: ad4695: use IIO_DECLARE_DMA_BUFFER_WITH_TS
  iio: introduce IIO_DECLARE_BUFFER_WITH_TS macros
  iio: make IIO_DMA_MINALIGN minimum of 8 bytes
  iio: pressure: zpa2326_spi: remove bits_per_word = 8
  iio: pressure: ms5611_spi: remove bits_per_word = 8
  ...
 2025-05-22 15:54:52 +02:00
David Lechner
017294e5a6 iio: adc: ad7606_spi: add offload scan mask check 
Validate the scan mask when SPI offloading is being used.

Since this family of ADCs is simultaneous sampling, there isn't a way
to selectively disable channels when reading sample data. (Technically,
AD7616 has a sequencer so the driver could have some control, but that
is for another day).

For "regular" IIO triggered buffer reads, this isn't a problem and the
IIO core will demux the data and ignore data from disabled channels.
However, since SPI offloading is done completely in hardware, we don't
have a way to do the same. So before this patch, if less than all
channels were enabled, the data would be misplaced in the buffer.

By adding a check in update_scan_mode, we can fail to enable the buffer
instead of having bad data returned to userspace.

Fixes: e96d35faf3 ("iio: adc: ad7606: add SPI offload support")
Signed-off-by: David Lechner <dlechner@baylibre.com>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Link: https://patch.msgid.link/20250502-iio-adc-ad7606_spi-fix-offload-scan-mask-check-v2-1-e70c6d71baa3@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
 2025-05-21 14:20:29 +01:00
David Lechner
89944d88f8 iio: adc: ad7606_spi: fix reg write value mask 
Fix incorrect value mask for register write. Register values are 8-bit,
not 9. If this function was called with a value > 0xFF and an even addr,
it would cause writing to the next register.

Fixes: f2a22e1e17 ("iio: adc: ad7606: Add support for software mode for ad7616")
Signed-off-by: David Lechner <dlechner@baylibre.com>
Reviewed-by: Angelo Dureghello <adureghello@baylibre.com>
Link: https://patch.msgid.link/20250428-iio-adc-ad7606_spi-fix-write-value-mask-v1-1-a2d5e85a809f@baylibre.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
 2025-05-04 17:45:41 +01:00
Angelo Dureghello
e96d35faf3 iio: adc: ad7606: add SPI offload support 
Add SPI offload support for this family.

Signed-off-by: Angelo Dureghello <adureghello@baylibre.com>
Reviewed-by: David Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20250403-wip-bl-spi-offload-ad7606-v1-3-1b00cb638b12@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
 2025-04-22 19:10:02 +01:00
David Lechner
3b5b55ca94 iio: adc: ad7606: dynamically allocate channel info 
Refactor the ad7606 drivers to dynamically allocate the channel info.

The channel info was getting a bit unwieldy. In some cases, the
indio_dev->channels field was getting assigned up to 3 different times,
each in a different function, making it difficult to see where the info
was coming from. This problem stems from the number of permutations of
the channel array needed to support various modes of operation and data
buses. We already have 4 per chip (hardware mode, software mode, AXI ADC
backend and AXI ADC backend with software mode) and we intend to add two
more per chip when adding SPI offload support.

To make it easier to read and maintain, move all of the channel setup
to a single function that dynamically allocates and fills in the channel
info.

Additionally, this lets us remove some hacks where we had to compute an
offset due to the fact that sometimes there was a soft timestamp channel
at the start of the array. Now the timestamp channel is always at the
end of the array as is typical in other drivers.

Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20250318-iio-adc-ad7606-improvements-v2-9-4b605427774c@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
 2025-04-22 19:09:54 +01:00
David Lechner
050cf84f0b iio: adc: ad7606: use kernel identifier name style 
Use lower_snake_case for the identifier names as that is the usual
kernel code style.

Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20250318-iio-adc-ad7606-improvements-v2-6-4b605427774c@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
 2025-04-22 19:09:54 +01:00
David Lechner
4d71bf6021 iio: adc: ad7606_spi: check error in ad7606B_sw_mode_config() 
Add missing error check in ad7606B_sw_mode_config().

Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20250318-iio-adc-ad7606-improvements-v2-2-4b605427774c@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
 2025-04-22 19:09:54 +01:00
Angelo Dureghello
f083f8a21c iio: adc: ad7606: fix serial register access 
Fix register read/write routine as per datasheet.

When reading multiple consecutive registers, only the first one is read
properly. This is due to missing chip select deassert and assert again
between first and second 16bit transfer, as shown in the datasheet
AD7606C-16, rev 0, figure 110.

Fixes: f2a22e1e17 ("iio: adc: ad7606: Add support for software mode for ad7616")
Reviewed-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Angelo Dureghello <adureghello@baylibre.com>
Link: https://patch.msgid.link/20250418-wip-bl-ad7606-fix-reg-access-v3-1-d5eeb440c738@baylibre.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
 2025-04-21 11:59:58 +01:00
Guillaume Stols
d2477887f6 iio: adc: ad7606: move software functions into common file 
Since the register are always the same, whatever bus is used, moving the
software functions into the main file avoids the code to be duplicated
in both SPI and parallel version of the driver.

Signed-off-by: Guillaume Stols <gstols@baylibre.com>
Co-developed-by: Angelo Dureghello <adureghello@baylibre.com>
Signed-off-by: Angelo Dureghello <adureghello@baylibre.com>
Link: https://patch.msgid.link/20250210-wip-bl-ad7606_add_backend_sw_mode-v4-3-160df18b1da7@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
 2025-02-11 19:56:25 +00:00
Peter Zijlstra
cdd30ebb1b module: Convert symbol namespace to string literal 
Clean up the existing export namespace code along the same lines of
commit 33def8498f ("treewide: Convert macro and uses of __section(foo)
to __section("foo")") and for the same reason, it is not desired for the
namespace argument to be a macro expansion itself.

Scripted using

  git grep -l -e MODULE_IMPORT_NS -e EXPORT_SYMBOL_NS | while read file;
  do
    awk -i inplace '
      /^#define EXPORT_SYMBOL_NS/ {
        gsub(/__stringify\(ns\)/, "ns");
        print;
        next;
      }
      /^#define MODULE_IMPORT_NS/ {
        gsub(/__stringify\(ns\)/, "ns");
        print;
        next;
      }
      /MODULE_IMPORT_NS/ {
        $0 = gensub(/MODULE_IMPORT_NS\(([^)]*)\)/, "MODULE_IMPORT_NS(\"\\1\")", "g");
      }
      /EXPORT_SYMBOL_NS/ {
        if ($0 ~ /(EXPORT_SYMBOL_NS[^(]*)\(([^,]+),/) {
  	if ($0 !~ /(EXPORT_SYMBOL_NS[^(]*)\(([^,]+), ([^)]+)\)/ &&
  	    $0 !~ /(EXPORT_SYMBOL_NS[^(]*)\(\)/ &&
  	    $0 !~ /^my/) {
  	  getline line;
  	  gsub(/[[:space:]]*\\$/, "");
  	  gsub(/[[:space:]]/, "", line);
  	  $0 = $0 " " line;
  	}

  	$0 = gensub(/(EXPORT_SYMBOL_NS[^(]*)\(([^,]+), ([^)]+)\)/,
  		    "\\1(\\2, \"\\3\")", "g");
        }
      }
      { print }' $file;
  done

Requested-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://mail.google.com/mail/u/2/#inbox/FMfcgzQXKWgMmjdFwwdsfgxzKpVHWPlc
Acked-by: Greg KH <gregkh@linuxfoundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 2024-12-02 11:34:44 -08:00
Alexandru Ardelean
2fb8548e05 iio: adc: ad7606: add support for AD760{7,8,9} parts 
The AD7607, AD7608 and AD7609 are some older parts of the AD7606 family.
They are hardware-only, meaning that they don't have any registers
accessible via SPI or Parallel interface.
They are more similar to the AD7605-4 part, which is supported by the
'ad7606' driver, and are configurable via GPIOs.

Like the AD7605-4 part, all 3 parts have 2 CONVST (Conversion Start) pins
(CONVST A and CONVST B). But in practice, these should be tied together to
make reading of samples easier via a serial line.

The AD7607 has an 14-bit resolution and AD7608 & AD7609 have an 18-bit
resolution. The main difference between the AD7608 & AD7609 is that the
AD7609 has a larger range (±10V & ±20V) vs the ±5V & ±10V ranges for AD7608.

However, unlike AD7605-4 part, these 3 parts have oversampling which is
configurable (like for the AD7606 in HW-mode) via GPIOs.

Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ad7607.pdf
Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ad7608.pdf
Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ad7609.pdf

Signed-off-by: Alexandru Ardelean <aardelean@baylibre.com>
Reviewed-by: David Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20241025095939.271811-6-aardelean@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
 2024-10-28 20:04:11 +00:00
Guillaume Stols
bc69e9fffd iio: adc: ad7606: Add compatibility to fw_nodes 
On the parallel version, the current implementation is only compatible
with id tables and won't work with fw_nodes, this commit intends to fix
it.

Doing so required to declare ad7606_chip_info structures in the .h file
so to make them accessible to all the driver files that can set a
pointer to the corresponding chip as the driver data.

Signed-off-by: Guillaume Stols <gstols@baylibre.com>
Link: https://patch.msgid.link/20241015-ad7606_add_iio_backend_support-v5-5-654faf1ae08c@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
 2024-10-21 19:19:26 +01:00
Guillaume Stols
1276d269fe iio: adc: ad7606: Sort includes in alphabetical order 
Some of the includes were not in alphabetical order, this commit fixes
it.

Signed-off-by: Guillaume Stols <gstols@baylibre.com>
Link: https://patch.msgid.link/20241004-ad7606_add_iio_backend_support-v3-5-38757012ce82@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
 2024-10-05 12:25:21 +01:00
Alexandru Ardelean
f3838e934d iio: adc: ad7606: add support for AD7606C-{16,18} parts 
The AD7606C-16 and AD7606C-18 are pretty similar with the AD7606B.
The main difference between AD7606C-16 & AD7606C-18 is the precision in
bits (16 vs 18).
Because of that, some scales need to be defined for the 18-bit variants, as
they need to be computed against 2**18 (vs 2**16 for the 16 bit-variants).

Because the AD7606C-16,18 also supports bipolar & differential channels,
for SW-mode, the default range of 10 V or ±10V should be set at probe.
On reset, the default range (in the registers) is set to value 0x3 which
corresponds to '±10 V single-ended range', regardless of bipolar or
differential configuration.

Aside from the scale/ranges, the AD7606C-16 is similar to the AD7606B.

The AD7606C-18 variant offers 18-bit precision. Because of this, the
requirement to use this chip is that the SPI controller supports padding
of 18-bit sequences to 32-bit arrays.

Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ad7606c-16.pdf
Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ad7606c-18.pdf

Signed-off-by: Alexandru Ardelean <aardelean@baylibre.com>
Link: https://patch.msgid.link/20240919130444.2100447-9-aardelean@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
 2024-10-05 12:09:06 +01:00
Alexandru Ardelean
300a90a6ba iio: adc: ad7606: add 'bits' parameter to channels macros 
There are some newer additions to the AD7606 family, which support 18 bit
precision. Up until now, all chips were 16 bit.

This change adds a 'bits' parameter to the AD760X_CHANNEL macro and renames
'ad7606_channels' -> 'ad7606_channels_16bit' for the current devices.

The AD7606_SW_CHANNEL() macro is also introduced, as a short-hand for IIO
channels in SW mode.

Signed-off-by: Alexandru Ardelean <aardelean@baylibre.com>
Reviewed-by: David Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20240919130444.2100447-2-aardelean@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
 2024-09-30 09:21:04 +01:00
Jonathan Cameron
09e3bdfe49 iio: adc: standardize on formatting for id match tables 
This is a frequent minor comment in reviews, so start cleaning up
existing drivers in the hope we get fewer cases of cut and paste.

There are not kernel wide rules for these, but for IIO the style
that I prefer (and hence most common) is:

- Space after { and before }
- No comma after terminator { }

This may cause merge conflicts but they should be trivial to resolve
hence I have not broken this into per driver patches.

Link: https://patch.msgid.link/20240818180912.719399-1-jic23@kernel.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
 2024-09-05 19:27:13 +01:00
Guillaume Stols
8dc4594b54 iio: adc: ad7606: fix oversampling gpio array 
gpiod_set_array_value was misused here: the implementation relied on the
assumption that an unsigned long was required for each gpio, while the
function expects a bit array stored in "as much unsigned long as needed
for storing one bit per GPIO", i.e it is using a bit field.

This leaded to incorrect parameter passed to gpiod_set_array_value, that
would set 1 value instead of 3.
It also prevents to select the software mode correctly for the AD7606B.

Fixes: d2a415c86c ("iio: adc: ad7606: Add support for AD7606B ADC")
Fixes: 41f71e5e7d ("staging: iio: adc: ad7606: Use find_closest() macro")
Signed-off-by: Guillaume Stols <gstols@baylibre.com>
Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
 2024-07-29 20:31:12 +01:00
Jonathan Cameron
59cea5bc7c iio:adc:ad76060: Move exports into IIO_AD7606 namespace. 
In order to avoid unnecessary pollution of the global symbol namespace
move the core/library functions into a specific namespace and import
that into the various bus specific device drivers that use them.

For more information see https://lwn.net/Articles/760045/

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20220130205701.334592-4-jic23@kernel.org
 2022-02-18 11:42:26 +00:00
Stefan Popa
d2a415c86c iio: adc: ad7606: Add support for AD7606B ADC 
The AD7606B is a 16-bit ADC that supports simultaneous sampling of 8
channels. It is pin compatible to AD7606, but adds extra modes by
writing to the register map.

The AD7606B can be configured to work in software mode by setting all
oversampling pins to high. This mode is selected by default.
The oversampling ratio is configured from the OS_MODE register (address
0x08) with the addition of OS=128 and OS=256 that were not available in
hardware mode.

The device is configured to output data on a single spi channel, but this
configuration must be done right after restart. That is why the delay was
removed for devices which doesn't require it.

Moreover, in software mode, the range gpio has no longer its function.
Instead, the scale can be configured individually for each channel from
the RANGE_CH registers (address 0x03 to 0x06). Besides the already
supported ±10 V and ±5 V ranges, software mode can also accommodate the
±2.5 V range.

Signed-off-by: Stefan Popa <stefan.popa@analog.com>
Co-developed-by: Beniamin Bia <beniamin.bia@analog.com>
Signed-off-by: Beniamin Bia <beniamin.bia@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
 2019-08-25 16:11:00 +01:00
Beniamin Bia
f2a22e1e17 iio: adc: ad7606: Add support for software mode for ad7616 
Support for ad7616 running in software was added. In order
to activate the software mode, HW_RNGSEL pins must be pulled low.
Oversampling and input ranges are now configured in corresponding
registers. Ad7616 has multiple scale options when it is configured
in software mode.
Also, in order to support multiple devices in software mode, the spi
calculation of registers address must be generic. Because
the length of address and bit which specifies the read/write operation is
different for every device, calculation of address was made generic.

Signed-off-by: Beniamin Bia <beniamin.bia@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
 2019-07-28 08:56:08 +01:00
Beniamin Bia
7989b4bb23 iio: adc: ad7616: Add support for AD7616 ADC 
The AD7616 is a 12-bit ADC with 16 channels.

The AD7616 can be configured to work in hardware mode by controlling it via
gpio pins and read data via spi. No support for software mode yet, but it
is a work in progress.

This device requires a reset in order to update oversampling, so chip info
has got a new attribute to mark this.

The current assumption that this driver makes for AD7616, is that it's
working in Hardware Mode with Serial, Burst and Sequencer modes activated.
To activate them, following pins must be pulled high:
	-SER/PAR
	-SEQEN
And following must be pulled low:
	-WR/BURST
	-DB4/SEQEN

Datasheets:
Link: https://www.analog.com/media/en/technical-documentation/data-sheets/ad7616.pdf

Signed-off-by: Beniamin Bia <beniamin.bia@analog.com>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
 2019-04-14 13:22:29 +01:00
Stefan Popa
2985a5d884 staging: iio: adc: ad7606: Move out of staging 
Move ad7606 ADC driver out of staging and into the mainline.

Signed-off-by: Stefan Popa <stefan.popa@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
 2019-01-05 16:10:59 +00:00