1 files changed, 44 insertions, 11 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);