[media] FE_READ_SNR and FE_READ_SIGNAL_STRENGTH docs

Around 01/14/2014 06:07 PM, Mauro Carvalho Chehab scribbled:
> Em Tue, 14 Jan 2014 17:55:19 +0200
> Georgi Chorbadzhiyski <gf@unixsol.org> escreveu:
>> Around 01/14/2014 05:30 PM, Mauro Carvalho Chehab scribbled:
>>> Em Tue, 14 Jan 2014 17:16:10 +0200
>>> Georgi Chorbadzhiyski <gf@unixsol.org> escreveu:

> >>>> Hi guys, I'm confused the documentation on:
> >>>>
> >>>> http://linuxtv.org/downloads/v4l-dvb-apis/frontend_fcalls.html#FE_READ_SNR
> >>>> http://linuxtv.org/downloads/v4l-dvb-apis/frontend_fcalls.html#FE_READ_SIGNAL_STRENGTH
> >>>>
> >>>> states that these ioctls return int16_t values but frontend.h states:
> >>>>
> >>>> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/include/uapi/linux/dvb/frontend.h
> >>>>
> >>>> #define FE_READ_SIGNAL_STRENGTH  _IOR('o', 71, __u16)
> >>>> #define FE_READ_SNR              _IOR('o', 72, __u16)
> >>>>
> >>>> So which one is true?

>>> Documentation is wrong. The returned values are unsigned. Would you mind send
>>> us a patch fixing it?
>>
>> I would be happy to, but I can't find the repo that holds the documentation.
>
> It is in the Kernel tree, under Documentation/DocBook/media/dvb.

The attached file contains the discussed documentation fixes.
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

Documentation/DocBook/media/dvb/frontend.xml

@@ -744,7 +744,7 @@ typedef enum fe_hierarchy {
 </para>
 <informaltable><tgroup cols="1"><tbody><row><entry
  align="char">
-<para>int ioctl(int fd, int request = <link linkend="FE_READ_SNR">FE_READ_SNR</link>, int16_t
+<para>int ioctl(int fd, int request = <link linkend="FE_READ_SNR">FE_READ_SNR</link>, uint16_t
  &#x22C6;snr);</para>
 </entry>
  </row></tbody></tgroup></informaltable>
@@ -766,7 +766,7 @@ typedef enum fe_hierarchy {
 </entry>
  </row><row><entry
  align="char">
-<para>int16_t *snr</para>
+<para>uint16_t *snr</para>
 </entry><entry
  align="char">
 <para>The signal-to-noise ratio is stored into *snr.</para>
@@ -791,7 +791,7 @@ typedef enum fe_hierarchy {
 <informaltable><tgroup cols="1"><tbody><row><entry
  align="char">
 <para>int ioctl( int fd, int request =
- <link linkend="FE_READ_SIGNAL_STRENGTH">FE_READ_SIGNAL_STRENGTH</link>, int16_t &#x22C6;strength);</para>
+ <link linkend="FE_READ_SIGNAL_STRENGTH">FE_READ_SIGNAL_STRENGTH</link>, uint16_t &#x22C6;strength);</para>
 </entry>
  </row></tbody></tgroup></informaltable>
 
@@ -814,7 +814,7 @@ typedef enum fe_hierarchy {
 </entry>
  </row><row><entry
  align="char">
-<para>int16_t *strength</para>
+<para>uint16_t *strength</para>
 </entry><entry
  align="char">
 <para>The signal strength value is stored into *strength.</para>