+/* (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 93.75Hz in steps of 46.875 Hz
+ */
+static int beep_linear_tone(struct hda_beep *beep, int hz)
+{
+ if (hz <= 0)
+ return 0;
+ hz *= 1000; /* fixed point */
+ hz = hz - DIGBEEP_HZ_MIN
+ + DIGBEEP_HZ_STEP / 2; /* round to nearest step */
+ if (hz < 0)
+ hz = 0; /* turn off PC beep*/
+ else if (hz >= (DIGBEEP_HZ_MAX - DIGBEEP_HZ_MIN))
+ hz = 1; /* max frequency */
+ else {
+ hz /= DIGBEEP_HZ_STEP;
+ hz = 255 - 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;
+}
+