linux-kernel - Re: [PATCH] media: pci: cx18: cx18-alsa-mixer.c: Remove some unused functions

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Date:	Sun, 21 Dec 2014 02:17:05 +0100
From:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
To:	Andy Walls <awalls@...metrocast.net>
Cc:	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	ivtv-devel@...vdriver.org, linux-media@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] media: pci: cx18: cx18-alsa-mixer.c: Remove some unused functions

2014-12-21 1:06 GMT+01:00 Andy Walls <awalls@...metrocast.net>:
> On December 20, 2014 5:35:17 PM EST, Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se> wrote:
>>Removes some functions that are not used anywhere:
>>snd_cx18_mixer_tv_vol_get() snd_cx18_mixer_tv_vol_info()
>>snd_cx18_mixer_tv_vol_put()
>>
>>This was partially found by using a static code analysis program called
>>cppcheck.
>>
>>Signed-off-by: Rickard Strandqvist
>><rickard_strandqvist@...ctrumdigital.se>
>>---
>>drivers/media/pci/cx18/cx18-alsa-mixer.c |   62
>>------------------------------
>> 1 file changed, 62 deletions(-)
>>
>>diff --git a/drivers/media/pci/cx18/cx18-alsa-mixer.c
>>b/drivers/media/pci/cx18/cx18-alsa-mixer.c
>>index 341bddc..e7b0a1f 100644
>>--- a/drivers/media/pci/cx18/cx18-alsa-mixer.c
>>+++ b/drivers/media/pci/cx18/cx18-alsa-mixer.c
>>@@ -69,68 +69,6 @@ static inline int cx18_av_vol_to_dB(int v)
>>       return (v >> 9) - 119;
>> }
>>
>>-static int snd_cx18_mixer_tv_vol_info(struct snd_kcontrol *kcontrol,
>>-                                    struct snd_ctl_elem_info *uinfo)
>>-{
>>-      uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
>>-      uinfo->count = 1;
>>-      /* We're already translating values, just keep this control in dB */
>>-      uinfo->value.integer.min  = -96;
>>-      uinfo->value.integer.max  =   8;
>>-      uinfo->value.integer.step =   1;
>>-      return 0;
>>-}
>>-
>>-static int snd_cx18_mixer_tv_vol_get(struct snd_kcontrol *kctl,
>>-                                   struct snd_ctl_elem_value *uctl)
>>-{
>>-      struct snd_cx18_card *cxsc = snd_kcontrol_chip(kctl);
>>-      struct cx18 *cx = to_cx18(cxsc->v4l2_dev);
>>-      struct v4l2_control vctrl;
>>-      int ret;
>>-
>>-      vctrl.id = V4L2_CID_AUDIO_VOLUME;
>>-      vctrl.value = dB_to_cx18_av_vol(uctl->value.integer.value[0]);
>>-
>>-      snd_cx18_lock(cxsc);
>>-      ret = v4l2_subdev_call(cx->sd_av, core, g_ctrl, &vctrl);
>>-      snd_cx18_unlock(cxsc);
>>-
>>-      if (!ret)
>>-              uctl->value.integer.value[0] = cx18_av_vol_to_dB(vctrl.value);
>>-      return ret;
>>-}
>>-
>>-static int snd_cx18_mixer_tv_vol_put(struct snd_kcontrol *kctl,
>>-                                   struct snd_ctl_elem_value *uctl)
>>-{
>>-      struct snd_cx18_card *cxsc = snd_kcontrol_chip(kctl);
>>-      struct cx18 *cx = to_cx18(cxsc->v4l2_dev);
>>-      struct v4l2_control vctrl;
>>-      int ret;
>>-
>>-      vctrl.id = V4L2_CID_AUDIO_VOLUME;
>>-      vctrl.value = dB_to_cx18_av_vol(uctl->value.integer.value[0]);
>>-
>>-      snd_cx18_lock(cxsc);
>>-
>>-      /* Fetch current state */
>>-      ret = v4l2_subdev_call(cx->sd_av, core, g_ctrl, &vctrl);
>>-
>>-      if (ret ||
>>-          (cx18_av_vol_to_dB(vctrl.value) != uctl->value.integer.value[0]))
>>{
>>-
>>-              /* Set, if needed */
>>-              vctrl.value = dB_to_cx18_av_vol(uctl->value.integer.value[0]);
>>-              ret = v4l2_subdev_call(cx->sd_av, core, s_ctrl, &vctrl);
>>-              if (!ret)
>>-                      ret = 1; /* Indicate control was changed w/o error */
>>-      }
>>-      snd_cx18_unlock(cxsc);
>>-
>>-      return ret;
>>-}
>>-
>>
>>/* This is a bit of overkill, the slider is already in dB internally */
>>static DECLARE_TLV_DB_SCALE(snd_cx18_mixer_tv_vol_db_scale, -9600, 100,
>>0);
>
> Really?  Did you try to compile the file after this patch?
>
> http://git.linuxtv.org/cgit.cgi/media_tree.git/tree/drivers/media/pci/cx18/cx18-alsa-mixer.c#n143
>
> They are referenced later in the same file.
>
> This is only half a fix.
>
>  You can either remove the cx18-alsa-mixer.* files and from the build system, or even better,you can hook-up and initialize these callbacks with alsa so alsa mixer controls show up for cx18.  :)
>



Hi

Ok sorry :-(

Sure, I compile everything as allyesconfig, allmodconfig and allnoconfig.

So snd_cx18_mixer_tv_volume_info is the same as snd_cx18_mixer_tv_vol_info then.

Would gladly done something a little more concrete.
But first I want to see if as I can go through all of the
approximately 2000 functions that are not in use.


Kind regards
Rickard Strandqvist
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