ASoC: max98095 codec: Catch driver bugs for biquad channel name

Move the biquad channel names to a separate array and iterate over it in
max98095_get_bq_channel rather than duplicating the hardcoded channel
names. Add an error message if an invalid channel is passed and check
the error in the callers.

Also added a BUILD_BUG_ON to ensure that the bq_mode_name and controls
arrays are the same size.

Signed-off-by: Ryan Mallon <rmallon@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 22 insertions, 10 deletions

diff --git a/sound/soc/codecs/max98095.c b/sound/soc/codecs/max98095.c
index 8f8e2555cbed..6982f743c891 100644
--- a/sound/soc/codecs/max98095.c
+++ b/sound/soc/codecs/max98095.c
@@ -1991,12 +1991,19 @@ static void max98095_handle_eq_pdata(struct snd_soc_codec *codec)
                 dev_err(codec->dev, "Failed to add EQ control: %d\n", ret);
 }
 
-static int max98095_get_bq_channel(const char *name)
+static const char *bq_mode_name[] = {"Biquad1 Mode", "Biquad2 Mode"};
+
+static int max98095_get_bq_channel(struct snd_soc_codec *codec,
+                                   const char *name)
 {
-        if (strcmp(name, "Biquad1 Mode") == 0)
-                return 0;
-        if (strcmp(name, "Biquad2 Mode") == 0)
-                return 1;
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(bq_mode_name); i++)
+                if (strcmp(name, bq_mode_name[i]) == 0)
+                        return i;
+
+        /* Shouldn't happen */
+        dev_err(codec->dev, "Bad biquad channel name '%s'\n", name);
         return -EINVAL;
 }
 
@@ -2006,14 +2013,15 @@ static int max98095_put_bq_enum(struct snd_kcontrol *kcontrol,
         struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
         struct max98095_priv *max98095 = snd_soc_codec_get_drvdata(codec);
         struct max98095_pdata *pdata = max98095->pdata;
-        int channel = max98095_get_bq_channel(kcontrol->id.name);
+        int channel = max98095_get_bq_channel(codec, kcontrol->id.name);
         struct max98095_cdata *cdata;
         int sel = ucontrol->value.integer.value[0];
         struct max98095_biquad_cfg *coef_set;
         int fs, best, best_val, i;
         int regmask, regsave;
 
-        BUG_ON(channel > 1);
+        if (channel < 0)
+                return channel;
 
         if (!pdata || !max98095->bq_textcnt)
                 return 0;
@@ -2065,9 +2073,12 @@ static int max98095_get_bq_enum(struct snd_kcontrol *kcontrol,
 {
         struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
         struct max98095_priv *max98095 = snd_soc_codec_get_drvdata(codec);
-        int channel = max98095_get_bq_channel(kcontrol->id.name);
+        int channel = max98095_get_bq_channel(codec, kcontrol->id.name);
         struct max98095_cdata *cdata;
 
+        if (channel < 0)
+                return channel;
+
         cdata = &max98095->dai[channel];
         ucontrol->value.enumerated.item[0] = cdata->bq_sel;
 
@@ -2085,15 +2096,16 @@ static void max98095_handle_bq_pdata(struct snd_soc_codec *codec)
         int ret;
 
         struct snd_kcontrol_new controls[] = {
-                SOC_ENUM_EXT("Biquad1 Mode",
+                SOC_ENUM_EXT((char *)bq_mode_name[0],
                         max98095->bq_enum,
                         max98095_get_bq_enum,
                         max98095_put_bq_enum),
-                SOC_ENUM_EXT("Biquad2 Mode",
+                SOC_ENUM_EXT((char *)bq_mode_name[1],
                         max98095->bq_enum,
                         max98095_get_bq_enum,
                         max98095_put_bq_enum),
         };
+        BUILD_BUG_ON(ARRAY_SIZE(controls) != ARRAY_SIZE(bq_mode_name));
 
         cfg = pdata->bq_cfg;
         cfgcnt = pdata->bq_cfgcnt;