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hwmon: (ntc_thermistor) Ensure iio channel is of type IIO_VOLTAGE

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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>
Cc: stable@vger.kernel.org # 3.10+
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Chris Lesiak 2015-05-26 15:40:44 -05:00 committed by Guenter Roeck
parent ba155e2d21
commit adba657533
1 changed files with 9 additions and 0 deletions
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9
drivers/hwmon/ntc_thermistor.c
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@ -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))