hwmon: (ntc_thermistor) Ensure iio channel is of type IIO_VOLTAGE
commit adba657533bdd255f7b78bc8a324091f46b294cd upstream. When configured via device tree, the associated iio device needs to be measuring voltage for the conversion to resistance to be correct. Return -EINVAL if that is not the case. Signed-off-by: Chris Lesiak <chris.lesiak@licor.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -181,8 +181,10 @@ static struct ntc_thermistor_platform_data *
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ntc_thermistor_parse_dt(struct platform_device *pdev)
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{
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struct iio_channel *chan;
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enum iio_chan_type type;
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struct device_node *np = pdev->dev.of_node;
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struct ntc_thermistor_platform_data *pdata;
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int ret;
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if (!np)
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return NULL;
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@ -195,6 +197,13 @@ ntc_thermistor_parse_dt(struct platform_device *pdev)
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if (IS_ERR(chan))
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return ERR_CAST(chan);
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ret = iio_get_channel_type(chan, &type);
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if (ret < 0)
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return ERR_PTR(ret);
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if (type != IIO_VOLTAGE)
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return ERR_PTR(-EINVAL);
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if (of_property_read_u32(np, "pullup-uv", &pdata->pullup_uv))
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return ERR_PTR(-ENODEV);
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if (of_property_read_u32(np, "pullup-ohm", &pdata->pullup_ohm))
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