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| author | Chris Lesiak <chris.lesiak@licor.com> | 2015-05-26 15:40:44 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-06-06 08:20:52 -0700 |
| commit | 3c40260cb054ec2ccf67058e7e768fa62964d926 (patch) | |
| tree | c25c06e99d34d34d90beb26d6838c161139a7ff4 /drivers/hwmon | |
| parent | a4b513b2a434a02381f2c981a3aba6ecb000118e (diff) | |
| download | lwn-3c40260cb054ec2ccf67058e7e768fa62964d926.tar.gz lwn-3c40260cb054ec2ccf67058e7e768fa62964d926.zip | |
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>
Diffstat (limited to 'drivers/hwmon')
| -rw-r--r-- | drivers/hwmon/ntc_thermistor.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/hwmon/ntc_thermistor.c b/drivers/hwmon/ntc_thermistor.c index 112e4d45e4a0..68800115876b 100644 --- a/drivers/hwmon/ntc_thermistor.c +++ b/drivers/hwmon/ntc_thermistor.c @@ -239,8 +239,10 @@ static struct ntc_thermistor_platform_data * ntc_thermistor_parse_dt(struct platform_device *pdev) { struct iio_channel *chan; + enum iio_chan_type type; struct device_node *np = pdev->dev.of_node; struct ntc_thermistor_platform_data *pdata; + int ret; if (!np) return NULL; @@ -253,6 +255,13 @@ ntc_thermistor_parse_dt(struct platform_device *pdev) if (IS_ERR(chan)) return ERR_CAST(chan); + ret = iio_get_channel_type(chan, &type); + if (ret < 0) + return ERR_PTR(ret); + + if (type != IIO_VOLTAGE) + return ERR_PTR(-EINVAL); + if (of_property_read_u32(np, "pullup-uv", &pdata->pullup_uv)) return ERR_PTR(-ENODEV); if (of_property_read_u32(np, "pullup-ohm", &pdata->pullup_ohm)) |