ALSA: hda - Fix digital beep tone calculation

The digital beep tone is calculated in two different ways depending
on the codec chip.  The standard one is using a divider, and another
one is a linear tone for IDT/STAC codecs.  Currently, only the
latter type is used for all codecs, which resulted in a wrong tone
pitch.

This patch adds the calculation of the standard HD-audio type.
Also clean-up the fields in hda_beep struct.

Reference: bko#13162
	http://bugzilla.kernel.org/show_bug.cgi?id=13162

Signed-off-by: Takashi Iwai <tiwai@suse.de>

3 files changed, 49 insertions, 13 deletions

diff --git a/sound/pci/hda/hda_beep.c b/sound/pci/hda/hda_beep.c
index 4de5bacd3929..29272f2e95a0 100644
--- a/sound/pci/hda/hda_beep.c
+++ b/sound/pci/hda/hda_beep.c
@@ -45,6 +45,46 @@ static void snd_hda_generate_beep(struct work_struct *work)
                         AC_VERB_SET_BEEP_CONTROL, beep->tone);
 }
 
+/* (non-standard) Linear beep tone calculation for IDT/STAC codecs 
+ *
+ * The tone frequency of beep generator on IDT/STAC codecs is
+ * defined from the 8bit tone parameter, in Hz,
+ *    freq = 48000 * (257 - tone) / 1024
+ * that is from 12kHz to 93.75kHz in step of 46.875 hz
+ */
+static int beep_linear_tone(struct hda_beep *beep, int hz)
+{
+        hz *= 1000; /* fixed point */
+        hz = hz - DIGBEEP_HZ_MIN;
+        if (hz < 0)
+                hz = 0; /* turn off PC beep*/
+        else if (hz >= (DIGBEEP_HZ_MAX - DIGBEEP_HZ_MIN))
+                hz = 0xff;
+        else {
+                hz /= DIGBEEP_HZ_STEP;
+                hz++;
+        }
+        return hz;
+}
+
+/* HD-audio standard beep tone parameter calculation
+ *
+ * The tone frequency in Hz is calculated as
+ *   freq = 48000 / (tone * 4)
+ * from 47Hz to 12kHz
+ */
+static int beep_standard_tone(struct hda_beep *beep, int hz)
+{
+        if (hz <= 0)
+                return 0; /* disabled */
+        hz = 12000 / hz;
+        if (hz > 0xff)
+                return 0xff;
+        if (hz <= 0)
+                return 1;
+        return hz;
+}
+
 static int snd_hda_beep_event(struct input_dev *dev, unsigned int type,
                                 unsigned int code, int hz)
 {
@@ -55,21 +95,14 @@ static int snd_hda_beep_event(struct input_dev *dev, unsigned int type,
                 if (hz)
                         hz = 1000;
         case SND_TONE:
-                hz *= 1000; /* fixed point */
-                hz = hz - DIGBEEP_HZ_MIN;
-                if (hz < 0)
-                        hz = 0; /* turn off PC beep*/
-                else if (hz >= (DIGBEEP_HZ_MAX - DIGBEEP_HZ_MIN))
-                        hz = 0xff;
-                else {
-                        hz /= DIGBEEP_HZ_STEP;
-                        hz++;
-                }
+                if (beep->linear_tone)
+                        beep->tone = beep_linear_tone(beep, hz);
+                else
+                        beep->tone = beep_standard_tone(beep, hz);
                 break;
         default:
                 return -1;
         }
-        beep->tone = hz;
 
         /* schedule beep event */
         schedule_work(&beep->beep_work);
diff --git a/sound/pci/hda/hda_beep.h b/sound/pci/hda/hda_beep.h
index 51bf6a5daf39..0c3de787c717 100644
--- a/sound/pci/hda/hda_beep.h
+++ b/sound/pci/hda/hda_beep.h
@@ -30,8 +30,9 @@ struct hda_beep {
         struct hda_codec *codec;
         char phys[32];
         int tone;
-        int nid;
-        int enabled;
+        hda_nid_t nid;
+        unsigned int enabled:1;
+        unsigned int linear_tone:1;     /* linear tone for IDT/STAC codec */
         struct work_struct beep_work; /* scheduled task for beep event */
 };
 
diff --git a/sound/pci/hda/patch_sigmatel.c b/sound/pci/hda/patch_sigmatel.c
index 02950980778e..17310814f121 100644
--- a/sound/pci/hda/patch_sigmatel.c
+++ b/sound/pci/hda/patch_sigmatel.c
@@ -3737,6 +3737,8 @@ static int stac92xx_parse_auto_config(struct hda_codec *codec, hda_nid_t dig_out
                 err = snd_hda_attach_beep_device(codec, nid);
                 if (err < 0)
                         return err;
+                /* IDT/STAC codecs have linear beep tone parameter */
+                codec->beep->linear_tone = 1;
                 /* if no beep switch is available, make its own one */
                 caps = query_amp_caps(codec, nid, HDA_OUTPUT);
                 if (codec->beep &&