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authorAdrian Knoth <adi@drcomp.erfurt.thur.de>2012-10-19 17:42:22 +0200
committerTakashi Iwai <tiwai@suse.de>2012-10-20 10:39:45 +0200
commit41285a98f8f052b59f01bbbcb0064e5e41b0ca2d (patch)
tree11fbf5848c0b9de60e0b79b29d4fe089e5c5043c
parent84f98fdf7865fbd35b312eb39ea91e5618c514c7 (diff)
downloadvexpress-lsk-41285a98f8f052b59f01bbbcb0064e5e41b0ca2d.tar.gz
ALSA: hdspm - Allow DDS/Varispeed to be set from userspace
The DDS value is the actual physical sample rate. We set it indirectly when selecting 44100, 48000 and so on via snd_hdspm_hw_params or hdspm_set_clock_source. This commit now allows the DDS value to be altered at runtime, thus speeding up or slowing down the physical sample rate. This is required for MADI's varispeed that allows for ±12.5% speed adjustment from the "selected" rate (32kHz, 44100kHz, 48kHz and so on). Signed-off-by: Adrian Knoth <adi@drcomp.erfurt.thur.de> Signed-off-by: Takashi Iwai <tiwai@suse.de>
-rw-r--r--sound/pci/rme9652/hdspm.c14
1 files changed, 13 insertions, 1 deletions
diff --git a/sound/pci/rme9652/hdspm.c b/sound/pci/rme9652/hdspm.c
index b12308b5ba2..742bd5e430a 100644
--- a/sound/pci/rme9652/hdspm.c
+++ b/sound/pci/rme9652/hdspm.c
@@ -2003,8 +2003,10 @@ static int hdspm_get_system_sample_rate(struct hdspm *hdspm)
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
.name = xname, \
.index = xindex, \
- .access = SNDRV_CTL_ELEM_ACCESS_READ, \
+ .access = SNDRV_CTL_ELEM_ACCESS_READWRITE |\
+ SNDRV_CTL_ELEM_ACCESS_VOLATILE, \
.info = snd_hdspm_info_system_sample_rate, \
+ .put = snd_hdspm_put_system_sample_rate, \
.get = snd_hdspm_get_system_sample_rate \
}
@@ -2030,6 +2032,16 @@ static int snd_hdspm_get_system_sample_rate(struct snd_kcontrol *kcontrol,
return 0;
}
+static int snd_hdspm_put_system_sample_rate(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *
+ ucontrol)
+{
+ struct hdspm *hdspm = snd_kcontrol_chip(kcontrol);
+
+ hdspm_set_dds_value(hdspm, ucontrol->value.enumerated.item[0]);
+ return 0;
+}
+
/**
* Returns the WordClock sample rate class for the given card.