tree 89471ce2b1f1d5fb24dd55f4d91fb64058818348
parent 2cc412b513f70ce914a3554a34917f7585a16f04
author Kim, Milo <Milo.Kim@ti.com> 1347871440 +0100
committer Jonathan Cameron <jic23@kernel.org> 1347905802 +0100

iio: inkern: add error case in iio_channel_get()

 The datasheet name is defined in the IIO driver.
 On the other hand, the adc_channel_label is configured in
 the platform side.
 If the datasheet name is not matched with any adc_channel_label,
 the iio_channel_get() should be returned as error for preventing
 invalid channel data access.

 This can be handled either way.
 (a) checking null data when using it : in the xxx_read_raw()
 or
 (b) error returns when the channel is requested : this patch

 The IIO consumer can't use the channel with invalid channel spec.
 Therefore case (b) is more reasonable.

Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>