threeeye
bc1d038eac
Squashed backup commit (no shallow-clone history issues) of xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2 branch, upstream commit 9eece662e) plus all fixes applied to get everpal_defconfig building clean against a modern (GCC 15.2.0) toolchain -- see the previous commit message on the lineage-23.2 branch (also in this repo history is not available here since this is a squashed snapshot; full incremental history lives in the local DL380 checkout and the upstream GitHub remote). Upstream: https://github.com/xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2)
51 lines
831 B
ReStructuredText
51 lines
831 B
ReStructuredText
.. -*- coding: utf-8; mode: rst -*-
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.. _FE_READ_SNR:
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***********
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FE_READ_SNR
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***********
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Name
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====
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FE_READ_SNR
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.. attention:: This ioctl is deprecated.
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Synopsis
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========
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.. c:function:: int ioctl(int fd, FE_READ_SNR, int16_t *snr)
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:name: FE_READ_SNR
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Arguments
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=========
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``fd``
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File descriptor returned by :c:func:`open() <dvb-fe-open>`.
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``snr``
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The signal-to-noise ratio is stored into \*snr.
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Description
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===========
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This ioctl call returns the signal-to-noise ratio for the signal
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currently received by the front-end. For this command, read-only access
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to the device is sufficient.
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Return Value
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============
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On success 0 is returned.
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On error -1 is returned, and the ``errno`` variable is set
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appropriately.
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Generic error codes are described at the
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:ref:`Generic Error Codes <gen-errors>` chapter.
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