diff options
Diffstat (limited to 'sound/pci/hda/hda_beep.c')
| -rw-r--r-- | sound/pci/hda/hda_beep.c | 55 |
1 files changed, 44 insertions, 11 deletions
diff --git a/sound/pci/hda/hda_beep.c b/sound/pci/hda/hda_beep.c index 4de5bac..29272f2 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); |
