ALSA: ice1724 - aureon - modify WM8770 Master & DAC volume

The volume levels in original implementation are incorrect and does
not match the dB scale. The real range is linear (in the sense of
the dB scale) from 0dB to -100dB. Remove logaritmic table and make
all volumes from range 0dB..100dB.

The tests are in RedHat's bugzilla #540817.
Signed-off-by: NJaroslav Kysela <perex@perex.cz>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

sound/pci/ice1712/aureon.c

@@ -689,32 +689,14 @@ static int aureon_ac97_mmute_put(struct snd_kcontrol *kcontrol, struct snd_ctl_e
 	return change;
 }
 
-static const DECLARE_TLV_DB_SCALE(db_scale_wm_dac, -12700, 100, 1);
+static const DECLARE_TLV_DB_SCALE(db_scale_wm_dac, -10000, 100, 1);
 static const DECLARE_TLV_DB_SCALE(db_scale_wm_pcm, -6400, 50, 1);
 static const DECLARE_TLV_DB_SCALE(db_scale_wm_adc, -1200, 100, 0);
 static const DECLARE_TLV_DB_SCALE(db_scale_ac97_master, -4650, 150, 0);
 static const DECLARE_TLV_DB_SCALE(db_scale_ac97_gain, -3450, 150, 0);
 
-/*
- * Logarithmic volume values for WM8770
- * Computed as 20 * Log10(255 / x)
- */
-static const unsigned char wm_vol[256] = {
-	127, 48, 42, 39, 36, 34, 33, 31, 30, 29, 28, 27, 27, 26, 25, 25, 24, 24, 23,
-	23, 22, 22, 21, 21, 21, 20, 20, 20, 19, 19, 19, 18, 18, 18, 18, 17, 17, 17,
-	17, 16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 13, 13, 13,
-	13, 13, 13, 13, 12, 12, 12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 11, 11,
-	11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8,
-	8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6,
-	6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
-	5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3,
-	3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
-	2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-	0, 0
-};
-
-#define WM_VOL_MAX	(sizeof(wm_vol) - 1)
+#define WM_VOL_MAX	100
+#define WM_VOL_CNT	101	/* 0dB .. -100dB */
 #define WM_VOL_MUTE	0x8000
 
 static void wm_set_vol(struct snd_ice1712 *ice, unsigned int index, unsigned short vol, unsigned short master)
@@ -724,7 +706,8 @@ static void wm_set_vol(struct snd_ice1712 *ice, unsigned int index, unsigned sho
 	if ((master & WM_VOL_MUTE) || (vol & WM_VOL_MUTE))
 		nvol = 0;
 	else
-		nvol = 127 - wm_vol[(((vol & ~WM_VOL_MUTE) * (master & ~WM_VOL_MUTE)) / 127) & WM_VOL_MAX];
+		nvol = ((vol % WM_VOL_CNT) * (master % WM_VOL_CNT)) /
+								WM_VOL_MAX;
 
 	wm_put(ice, index, nvol);
 	wm_put_nocache(ice, index, 0x180 | nvol);
@@ -820,7 +803,7 @@ static int wm_vol_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *
 	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 	uinfo->count = voices;
 	uinfo->value.integer.min = 0;		/* mute (-101dB) */
-	uinfo->value.integer.max = 0x7F;	/* 0dB */
+	uinfo->value.integer.max = WM_VOL_MAX;	/* 0dB */
 	return 0;
 }
 
@@ -850,7 +833,7 @@ static int wm_vol_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *
 	snd_ice1712_save_gpio_status(ice);
 	for (i = 0; i < voices; i++) {
 		unsigned int vol = ucontrol->value.integer.value[i];
-		if (vol > 0x7f)
+		if (vol > WM_VOL_MAX)
 			continue;
 		vol |= spec->vol[ofs+i];
 		if (vol != spec->vol[ofs+i]) {