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This makes use of the new devm_regulator_get_enable_read_voltage()
helper function to reduce boilerplate code in the MCP3564 ADC driver.
The error message is slightly changed since there are fewer error
return paths.
Setting adc->vref_mv is consolidated into a single place to make the
logic easier to follow.
A use_internal_vref_attr local variable is added to make it more
obvious what the difference between the two iio info structures is.
The return value of the "Unknown Vref" dev_err_probe() is hard-coded to
-ENODEV instead of ret since it was getting a bit far from where ret
was set and logically that is the only value it could have.
Signed-off-by: David Lechner <dlechner@baylibre.com>
Reviewed-by: Marius Cristea <marius.cristea@microchip.com>
Link: https://patch.msgid.link/20240723-iio-regulator-refactor-round-3-v2-1-ae9291201785@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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The driver calls spi_get_device_match_data() and on its failure calls
again parts of it: spi_get_device_id() and getting driver data. This is
entirely redundant, because it is part of spi_get_device_match_data().
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20240606-spi-match-data-v1-8-320b291ee1fe@linaro.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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Switching to the _scoped() version removes the need for manual
calling of fwnode_handle_put() in the paths where the code
exits the loop early. In this case that's all in error paths.
Reviewed-by: Marcelo Schmitt <marcelo.schmitt1@gmail.com>
Reviewed-by: Marius Cristea <marius.cristea@microchip.com>
Link: https://lore.kernel.org/r/20240428174020.1832825-2-jic23@kernel.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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In mcp3564_config() fix the hardware identification logic
based on the hardware ID registers. Second part of the code was
disabled by an logic error.
Fix a typo related to the "MODULE_DESCRIPTION".
Fixes: 33ec3e5fc1ea (iio: adc: adding support for MCP3564 ADC)
Signed-off-by: Marius Cristea <marius.cristea@microchip.com>
Link: https://lore.kernel.org/r/20231129135619.63475-1-marius.cristea@microchip.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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The current implementation uses the AND (&&) operator to check if the
value to write for IIO_CHAN_INFO_CALIBBIAS and IIO_CHAN_INFO_CALIBSCALE
is within the valid ranges.
The evaluated values are the lower and upper limits of the ranges,
so this operation always evaluates to false.
The OR (||) operator must be used instead.
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Reviewed-by: Marius Cristea <marius.cristea@microchip.com>
Link: https://lore.kernel.org/r/20231201-mcp3564_range_checks-v1-1-68f4436e22b0@gmail.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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The patch 33ec3e5fc1ea: "iio: adc: adding support for MCP3564 ADC"
leads to the following Smatch static checker warning:
smatch warnings:
drivers/iio/adc/mcp3564.c:1105 mcp3564_fill_scale_tbls() warn: unsigned '__x' is never less than zero.
vim +/__x +1105 drivers/iio/adc/mcp3564.c
1094
1095 static void mcp3564_fill_scale_tbls(struct mcp3564_state *adc)
1096 {
.....
1103 for (i = 0; i < MCP3564_MAX_PGA; i++) {
1104 ref = adc->vref_mv;
> 1105 tmp1 = shift_right((u64)ref * NANO, pow);
1106 div_u64_rem(tmp1, NANO, &tmp0);
1107
.....
1113 }
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202309280738.NWjVfVt4-lkp@intel.com/
Fixes: 33ec3e5fc1ea (iio: adc: adding support for MCP3564 ADC)
Signed-off-by: Marius Cristea <marius.cristea@microchip.com>
Link: https://lore.kernel.org/r/20231013132333.10582-1-marius.cristea@microchip.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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The patch 33ec3e5fc1ea: "iio: adc: adding support for MCP3564 ADC"
from Aug 29, 2023 (linux-next), leads to the following Smatch static
checker warning:
drivers/iio/adc/mcp3564.c:1426 mcp3564_probe()
warn: address of NULL pointer 'indio_dev'
drivers/iio/adc/mcp3564.c
1421 struct iio_dev *indio_dev;
1422 struct mcp3564_state *adc;
1423
1424 indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*adc));
1425 if (!indio_dev) {
--> 1426 dev_err_probe(&indio_dev->dev, PTR_ERR(indio_dev),
^^^^^^^^^^^^^^^
Fixes: 33ec3e5fc1ea (iio: adc: adding support for MCP3564 ADC)
Signed-off-by: Marius Cristea <marius.cristea@microchip.com>
Link: https://lore.kernel.org/r/20230918075633.1884-1-marius.cristea@microchip.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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This is the iio driver for Microchip family of 153.6 ksps,
Low-Noise 16/24-Bit Delta-Sigma ADCs with an SPI interface
(Microchip's MCP3461, MCP3462, MCP3464, MCP3461R, MCP3462R,
MCP3464R, MCP3561, MCP3562, MCP3564, MCP3561R,
MCP3562R and MCP3564R analog to digital converters).
Signed-off-by: Marius Cristea <marius.cristea@microchip.com>
Link: https://lore.kernel.org/r/20230829154133.40716-3-marius.cristea@microchip.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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