May 2012 - Alsa-devel - mailman.alsa-project.org

Re: [alsa-devel] [PATCH]: sound/usb/mixer.c: Volume quirks compare empty string kctl->id.name.
by Takashi Iwai 16 May '12

16 May '12

At Wed, 16 May 2012 10:03:42 +0200, Christian Melki wrote: > > Takashi, > > I tried it on 3.3.2 on my embedded PPC machine (snd_usb_mixer_vol_tlv -> mixer_vol_tlv). Works fine for me. Thanks, it was already queued for 3.5 kernel. Takashi > > Regards, > Christian > > > > At Mon, 7 May 2012 09:51:29 +0200, > > Christian Melki wrote: > > > > > > > > Hi, > > > > > > > > > > Sorry to mail you directly. But I have tried to mail > > several times > > > > > to the mailing list but I don't get through. Everything > > checks out > > > > > fine, no html etc, other mailing lists work fine, but > > not alsa devel. > > > > > Anyway, could you please have a look at this? > > > > > > > > Could you resend the patch but just add me, Clemens and > > Daniel to Cc, so that it reaches to main developers for > > usb-audio? Even if we take your patch as is, it'd be needed > > to be applicable via git-am. > > > > > > > > > > > > thanks, > > > > > > > > Takashi > > > > > > Hi. > > > > > > I noticied that volume quirks in usb-audio did not get applied. > > > This is because kctl->id.name gets built properly _after_ > > calling the quirk adjustments. > > > My solution is a bit ugly, but check_mapped_dB needs the > > adjustment before getting called. > > > I split the call over the switch. If someone feels like > > writing something cleaner, please feel free. > > > This works for me atleast. > > > > It's not ugly, but it'd be better to split the code to handle > > the name string, call get_min_max_*(), then the rest for FU. > > > > Could you check whether the patch below works? > > > > > > thanks, > > > > Takashi > > > > --- > > From: Takashi Iwai <tiwai(a)suse.de> > > Subject: [PATCH] ALSA: usb-audio - Call get_min_max_*() after > > determining the name string > > > > get_min_max_with_quirks() must be called after the control id > > name string is determined, but the current code changes the > > id name string after calling the function. > > > > Reported-by: Christian Melki <christian.melki(a)ericsson.com> > > Signed-off-by: Takashi Iwai <tiwai(a)suse.de> > > --- > > sound/usb/mixer.c | 26 +++++++++++++------------- > > 1 file changed, 13 insertions(+), 13 deletions(-) > > > > diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c index > > 3d70245..4f40ba8 100644 > > --- a/sound/usb/mixer.c > > +++ b/sound/usb/mixer.c > > @@ -1141,9 +1141,6 @@ static void build_feature_ctl(struct > > mixer_build *state, void *raw_desc, > > len = snd_usb_copy_string_desc(state, nameid, > > kctl->id.name, sizeof(kctl->id.name)); > > > > - /* get min/max values */ > > - get_min_max_with_quirks(cval, 0, kctl); > > - > > switch (control) { > > case UAC_FU_MUTE: > > case UAC_FU_VOLUME: > > @@ -1175,17 +1172,7 @@ static void build_feature_ctl(struct > > mixer_build *state, void *raw_desc, > > } > > append_ctl_name(kctl, control == UAC_FU_MUTE ? > > " Switch" : " Volume"); > > - if (control == UAC_FU_VOLUME) { > > - check_mapped_dB(map, cval); > > - if (cval->dBmin < cval->dBmax || > > !cval->initialized) { > > - kctl->tlv.c = snd_usb_mixer_vol_tlv; > > - kctl->vd[0].access |= > > - SNDRV_CTL_ELEM_ACCESS_TLV_READ | > > - > > SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK; > > - } > > - } > > break; > > - > > default: > > if (! len) > > strlcpy(kctl->id.name, > > audio_feature_info[control-1].name, > > @@ -1193,6 +1180,19 @@ static void build_feature_ctl(struct > > mixer_build *state, void *raw_desc, > > break; > > } > > > > + /* get min/max values */ > > + get_min_max_with_quirks(cval, 0, kctl); > > + > > + if (control == UAC_FU_VOLUME) { > > + check_mapped_dB(map, cval); > > + if (cval->dBmin < cval->dBmax || !cval->initialized) { > > + kctl->tlv.c = snd_usb_mixer_vol_tlv; > > + kctl->vd[0].access |= > > + SNDRV_CTL_ELEM_ACCESS_TLV_READ | > > + SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK; > > + } > > + } > > + > > range = (cval->max - cval->min) / cval->res; > > /* Are there devices with volume range more than 255? I > > use a bit more > > * to be sure. 384 is a resolution magic number found > > on Logitech > > -- > > 1.7.9.2 > > > >

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[alsa-devel] [PATCH] ASoC: dmic codec: Support for DT
by Peter Ujfalusi 15 May '12

15 May '12

Add bindings to be able to probe the dmic codec driver via device tree. The device tree entry of a machine driver can use phandle to provide the device node for it's dai link structure. Signed-off-by: Peter Ujfalusi <peter.ujfalusi(a)ti.com> --- .../devicetree/bindings/sound/dmic-codec.txt | 18 ++++++++++++++++++ sound/soc/codecs/dmic.c | 6 ++++++ 2 files changed, 24 insertions(+), 0 deletions(-) create mode 100644 Documentation/devicetree/bindings/sound/dmic-codec.txt diff --git a/Documentation/devicetree/bindings/sound/dmic-codec.txt b/Documentation/devicetree/bindings/sound/dmic-codec.txt new file mode 100644 index 0000000..f23f2e3 --- /dev/null +++ b/Documentation/devicetree/bindings/sound/dmic-codec.txt @@ -0,0 +1,18 @@ +Generic platform independent codec driver to represent digital microphones + +The dmic codec driver basically a dummy driver which exports the needed hooks +to be used with digital microphone interfaces. + +Required properties: +- compatible : Must be "generic,dmic-codec"; + +Example: + +dmic_codec: dmic_codec@0 { /* generic DMIC codec */ + compatible = "generic,dmic-codec"; +}; + +sound { /* ASoC machine dirver */ + ... + dai-link,codec = <&dmic_codec>; +}; diff --git a/sound/soc/codecs/dmic.c b/sound/soc/codecs/dmic.c index 3e929f0..90e92f5 100644 --- a/sound/soc/codecs/dmic.c +++ b/sound/soc/codecs/dmic.c @@ -78,12 +78,18 @@ static int __devexit dmic_dev_remove(struct platform_device *pdev) return 0; } +static const struct of_device_id dmic_of_match[] = { + {.compatible = "generic,dmic-codec", }, + { }, +}; +MODULE_DEVICE_TABLE(of, dmic_of_match); MODULE_ALIAS("platform:dmic-codec"); static struct platform_driver dmic_driver = { .driver = { .name = "dmic-codec", .owner = THIS_MODULE, + .of_match_table = dmic_of_match, }, .probe = dmic_dev_probe, .remove = __devexit_p(dmic_dev_remove), -- 1.7.8.6

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[alsa-devel] Undocumented Sound Blaster 16 extended mixer registers
by Ondrej Zary 15 May '12

15 May '12

Hello, while playing with various SB16 types, found that the newer types have some extended mixer registers that aren't documented anywhere. Windows 9x driver detects and uses them so e.g. Auxiliary input appears when using CT2511-based card, MIDI mute becomes available on some cards, etc. Chips tested: CT1746B+CT1745A: SB16 SCSI CT1747+CT1745A: SB16 IDE CT2504: Vibra 16S CT2505: Vibra 16C (PnP) CT2511: Vibra 16XV (PnP) CT8920: AWE64 (the last one with integrated mixer) (PnP) Registers found: ---------------- 0x48: Output switches 2 all supported bits are set after reset (0x1f on CT2505 and CT8920, 0x7f on CT2511) bit 0: PC Speaker bit 1: PCM bit 2: PCM bit 3: MIDI bit 4: MIDI bit 5: AUX (CT2511 only, zero otherwise) bit 6: AUX (CT2511 only, zero otherwise) bit 7: unused (always zero) 0x49: Master switches all supported bits are set after reset (0x0f on CT2511, 0x0c on CT8920) bit 0: capture bit 1: capture bit 2: playback bit 3: playback bits 4..7: unused (always zero) 0x4a: Input switches 2 zero after reset bit 0: PCM bit 1: PCM bit 2: AUX (CT2511 only, zero otherwise) bit 3: AUX (CT2511 only, zero otherwise) bits 4..7: unused (always zero) 0x4b: ?? 0x63 after reset (on CT2511 and CT8920) bits 0..5 writable CT2511 also provides two additional volume controls: 0x50,0x51: Master Capture Volume (bits 7..3) reads as 0xE0 after reset when present 0x52,0x53: AUX Volume (bits 7..3) reads as 0xC0 after reset when present There are no extended registers on the older cards (CT1746B+CT1745A, CT1747+CT1745A and CT2504). CT2505 implements only 0x48. AUX is an additional input, used at least on SF16-FMD2 card to connect integrated FM tuner. I'm going to prepare a patch that allows sb16 driver to detect these additional controls and enable them if found. However, I still haven't found how Windows driver detects Bass/Treble control presence. All chips have the bass/treble registers (0x44-0x47) present and writable but they have no effect on all Vibra chips except CT2502 (which I don't have). There must be some other register which says that bass/treble controls are not available. -- Ondrej Zary

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[alsa-devel] [PATCH 0/1] Enable sound on mx31_3ds
by Philippe Rétornaz 15 May '12

15 May '12

Hi Here is the sound support for mx31_3ds. It successfully outputs sound on the loudspeaker. It needs the patchset: "MC13783 sound support". Philippe Rétornaz (1): mx31_3ds: Add sound support arch/arm/mach-imx/Kconfig | 1 + arch/arm/mach-imx/mach-mx31_3ds.c | 22 +++++++++++++++++++++- 2 files changed, 22 insertions(+), 1 deletions(-)

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[alsa-devel] Last minute ASoC fixes for 3.4
by Mark Brown 15 May '12

15 May '12

The following changes since commit 06412088ce98f745405b8f65cfc51ddd6b842bbf: ASoC: s3c2412-i2s: Fix dai registration (2012-04-30 23:45:25 +0100) are available in the git repository at: git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git tags/asoc-3.4 for you to fetch changes up to c7f5f2389377b66028bc129890aa653deafe8d39: ASoC: wm8994: Fix AIF2ADC power down (2012-05-15 18:29:30 +0100) I'll send the big 3.5 update either later tonight or tomorrow. ---------------------------------------------------------------- ASoC: Last minute fixes Some last minute fixes for ASoC. Small, focused changes to specific drivers. ---------------------------------------------------------------- Brian Austin (1): ASoC: cs42l73: Sync digital mixer kcontrols to allow for 0dB Guennadi Liakhovetski (1): ASoC: sh: fix migor.c compilation Mark Brown (1): ASoC: wm8994: Fix AIF2ADC power down sound/soc/codecs/cs42l73.c | 16 ++++++++-------- sound/soc/codecs/wm8994.c | 2 +- sound/soc/sh/migor.c | 2 +- 3 files changed, 10 insertions(+), 10 deletions(-)

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[alsa-devel] [PATCH] ASoC: wm8994: Fix AIF2ADC power down
by Mark Brown 15 May '12

15 May '12

Signed-off-by: Mark Brown <broonie(a)opensource.wolfsonmicro.com> --- sound/soc/codecs/wm8994.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/sound/soc/codecs/wm8994.c b/sound/soc/codecs/wm8994.c index 6c1fe3a..2de12eb 100644 --- a/sound/soc/codecs/wm8994.c +++ b/sound/soc/codecs/wm8994.c @@ -1144,7 +1144,7 @@ static int aif2clk_ev(struct snd_soc_dapm_widget *w, snd_soc_update_bits(codec, WM8994_POWER_MANAGEMENT_5, WM8994_AIF2DACL_ENA | WM8994_AIF2DACR_ENA, 0); - snd_soc_update_bits(codec, WM8994_POWER_MANAGEMENT_5, + snd_soc_update_bits(codec, WM8994_POWER_MANAGEMENT_4, WM8994_AIF2ADCL_ENA | WM8994_AIF2ADCR_ENA, 0); -- 1.7.10

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[alsa-devel] ASoC: wm9712: Microphone doesn't work, "Capture Volume" inverted
by Christoph Fritz 15 May '12

15 May '12

Hi Mark, Liam, Hans J. and List, I have a "wm9712" codec-chip on an ARM mx35 board and everything works except Microphone. Strange is that I can't change the Mic-Select-Source: # amixer sset "Mic Select Source" 'Mic 2' Simple mixer control 'Mic Select Source',0 Capabilities: enum Items: 'Mic 1' 'Differential' 'Mic 2' 'Stereo' Item0: 'Mic 1' When I tested arecord for line-in, the "Capture Slide" in alsamixer was wrongly inverted. in sound/soc/codecs/wm9712.c: SOC_DOUBLE("Capture Volume", AC97_REC_GAIN, 8, 0, 63, 1), should get: SOC_DOUBLE("Capture Volume", AC97_REC_GAIN, 8, 0, 63, 0), If you want I can send a patch in. I'm using the current linus git tree (3.4.0-rc4). I tried it with linux-2.6.33.20 (with sound/soc/imx/imx-ssi.c etc. from 2.6.34) and it works. On a fairly similar board I was told that it works on Kernel 3.0.4 with this patch applied: Since patch "ASoC: Sync initial widget state with hardware" (commitid: b66a70d5e9929f3b0df5a7177bba75652d2f4c3e) the mic capture doesn't work. The MICBIAS bit from the "Power Management" Register are alway 1 (disabled). So that the captering works the active status must be set to 1, at the right time. That this works the stream name must be set. --- include/sound/soc-dapm.h | 3 ++- sound/soc/soc-dapm.c | 4 ++-- 2 files changed, 4 insertions(+), 3 deletions(-) diff --git a/include/sound/soc-dapm.h b/include/sound/soc-dapm.h index c46e7d8..308122a 100644 --- a/include/sound/soc-dapm.h +++ b/include/sound/soc-dapm.h @@ -85,7 +85,8 @@ .shift = wshift, .invert = winvert, .kcontrol_news = wcontrols, \ .num_kcontrols = wncontrols} #define SND_SOC_DAPM_MICBIAS(wname, wreg, wshift, winvert) \ -{ .id = snd_soc_dapm_micbias, .name = wname, .reg = wreg, .shift = wshift, \ +{ .id = snd_soc_dapm_micbias, .name = wname, .sname = \ + "Mic Bias HiFi Capture", .reg = wreg, .shift = wshift, \ .invert = winvert, .kcontrol_news = NULL, .num_kcontrols = 0} #define SND_SOC_DAPM_SWITCH(wname, wreg, wshift, winvert, wcontrols) \ { .id = snd_soc_dapm_switch, .name = wname, .reg = wreg, .shift = wshift, \ diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c index 32ab7fc..250a1d2 100644 --- a/sound/soc/soc-dapm.c +++ b/sound/soc/soc-dapm.c @@ -646,7 +646,7 @@ static int is_connected_input_ep(struct snd_soc_dapm_widget *widget) return snd_soc_dapm_suspend_check(widget); /* connected VMID/Bias for lower pops */ - if (widget->id == snd_soc_dapm_vmid) + if (widget->id == snd_soc_dapm_vmid || widget->id == snd_soc_dapm_micbias) return snd_soc_dapm_suspend_check(widget); /* connected jack ? */ @@ -1835,6 +1835,7 @@ int snd_soc_dapm_new_widgets(struct snd_soc_dapm_context *dapm) break; case snd_soc_dapm_adc: case snd_soc_dapm_aif_out: + case snd_soc_dapm_micbias: w->power_check = dapm_adc_check_power; break; case snd_soc_dapm_dac: @@ -1848,7 +1849,6 @@ int snd_soc_dapm_new_widgets(struct snd_soc_dapm_context *dapm) break; case snd_soc_dapm_input: case snd_soc_dapm_output: - case snd_soc_dapm_micbias: case snd_soc_dapm_spk: case snd_soc_dapm_hp: case snd_soc_dapm_mic: -- Thanks, -- Christoph It follows the output of "amixer scontents", "amixer controls" and "amixer contents": Simple mixer control 'Headphone',0 Capabilities: pvolume pswitch pswitch-joined penum Playback channels: Front Left - Front Right Limits: Playback 0 - 31 Mono: Front Left: Playback 20 [65%] [on] Front Right: Playback 20 [65%] [on] Simple mixer control 'Headphone Playback ZC',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'Speaker',0 Capabilities: pvolume pswitch pswitch-joined penum Playback channels: Front Left - Front Right Limits: Playback 0 - 31 Mono: Front Left: Playback 6 [19%] [off] Front Right: Playback 6 [19%] [off] Simple mixer control 'Speaker Mixer Aux',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'Speaker Mixer Line Bypass',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'Speaker Mixer PCBeep Bypass',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'Speaker Mixer PCM',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'Speaker Mixer Phone Bypass',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'Speaker Mux',0 Capabilities: enum Items: 'Speaker Mix' 'Headphone Mix' Item0: 'Speaker Mix' Simple mixer control 'Speaker Playback Invert',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'Speaker Playback ZC',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'Tone Cut-off',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'Bass',0 Capabilities: volume volume-joined penum Playback channels: Mono Capture channels: Mono Limits: 0 - 15 Mono: 0 [0%] Simple mixer control 'Bass Control',0 Capabilities: enum Items: 'Linear Control' 'Adaptive Boost' Item0: 'Linear Control' Simple mixer control 'Bass Cut-off',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'Treble',0 Capabilities: volume volume-joined penum Playback channels: Mono Capture channels: Mono Limits: 0 - 15 Mono: 9 [60%] Simple mixer control 'PCM',0 Capabilities: pvolume penum Playback channels: Front Left - Front Right Limits: Playback 0 - 31 Mono: Front Left: Playback 17 [55%] Front Right: Playback 17 [55%] Simple mixer control 'Line',0 Capabilities: cvolume penum Capture channels: Front Left - Front Right Limits: Capture 0 - 31 Front Left: Capture 23 [74%] Front Right: Capture 23 [74%] Simple mixer control 'Mic 1',0 Capabilities: volume volume-joined penum Playback channels: Mono Capture channels: Mono Limits: 0 - 31 Mono: 23 [74%] [0.00dB] Simple mixer control 'Mic 2',0 Capabilities: volume volume-joined penum Playback channels: Mono Capture channels: Mono Limits: 0 - 31 Mono: 18 [58%] [-7.50dB] Simple mixer control 'Mic Boost',0 Capabilities: volume volume-joined penum Playback channels: Mono Capture channels: Mono Limits: 0 - 1 Mono: 0 [0%] [0.00dB] Simple mixer control 'Mic Headphone ',0 Capabilities: volume volume-joined penum Playback channels: Mono Capture channels: Mono Limits: 0 - 7 Mono: 3 [43%] Simple mixer control 'Mic Select Source',0 Capabilities: enum Items: 'Mic 1' 'Differential' 'Mic 2' 'Stereo' Item0: 'Mic 1' Simple mixer control 'Phone',0 Capabilities: volume volume-joined penum Playback channels: Mono Capture channels: Mono Limits: 0 - 15 Mono: 14 [93%] Simple mixer control 'Phone Mixer Aux',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'Phone Mixer Line Bypass',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'Phone Mixer Mic 1 Sidetone',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'Phone Mixer Mic 2 Sidetone',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'Phone Mixer PCBeep Bypass',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'Phone Mixer PCM',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'Aux Playback Headphone',0 Capabilities: volume volume-joined penum Playback channels: Mono Capture channels: Mono Limits: 0 - 7 Mono: 0 [0%] Simple mixer control 'Aux Playback Phone',0 Capabilities: volume volume-joined penum Playback channels: Mono Capture channels: Mono Limits: 0 - 7 Mono: 0 [0%] Simple mixer control 'Aux Playback Speaker',0 Capabilities: volume volume-joined penum Playback channels: Mono Capture channels: Mono Limits: 0 - 7 Mono: 0 [0%] Simple mixer control 'Mono',0 Capabilities: pvolume pvolume-joined pswitch pswitch-joined penum Playback channels: Mono Limits: Playback 0 - 31 Mono: Playback 0 [0%] [off] Simple mixer control 'Mono Playback ZC',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'Playback Attenuate (-6dB)',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'Capture',0 Capabilities: cvolume penum Capture channels: Front Left - Front Right Limits: Capture 0 - 63 Front Left: Capture 13 [21%] Front Right: Capture 13 [21%] Simple mixer control 'Capture 20dB Boost',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'Capture ADC',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [on] Simple mixer control 'Capture Phone Mux',0 Capabilities: enum Items: 'Stereo' 'Left' 'Right' 'Mute' Item0: 'Mute' Simple mixer control 'Capture Volume Steps',0 Capabilities: enum Items: '+1.5dB Steps' '+0.75dB Steps' Item0: '+0.75dB Steps' Item1: '+0.75dB Steps' Simple mixer control 'Capture ZC',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [on] Simple mixer control 'Capture to Phone 20dB Boost',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control '3D',0 Capabilities: pvolume pvolume-joined penum Playback channels: Mono Limits: Playback 0 - 15 Mono: Playback 0 [0%] Simple mixer control '3D Lower Cut-off',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control '3D Upper Cut-off',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'ALC Attack Time',0 Capabilities: volume volume-joined penum Playback channels: Mono Capture channels: Mono Limits: 0 - 15 Mono: 0 [0%] Simple mixer control 'ALC Decay Time',0 Capabilities: volume volume-joined penum Playback channels: Mono Capture channels: Mono Limits: 0 - 15 Mono: 0 [0%] Simple mixer control 'ALC Function',0 Capabilities: enum Items: 'None' 'Left' 'Right' 'Stereo' Item0: 'None' Simple mixer control 'ALC Headphone',0 Capabilities: volume volume-joined penum Playback channels: Mono Capture channels: Mono Limits: 0 - 7 Mono: 0 [0%] Simple mixer control 'ALC Hold Time',0 Capabilities: volume volume-joined penum Playback channels: Mono Capture channels: Mono Limits: 0 - 15 Mono: 0 [0%] Simple mixer control 'ALC Max',0 Capabilities: volume volume-joined penum Playback channels: Mono Capture channels: Mono Limits: 0 - 7 Mono: 0 [0%] Simple mixer control 'ALC NG',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'ALC NG Threshold',0 Capabilities: volume volume-joined penum Playback channels: Mono Capture channels: Mono Limits: 0 - 31 Mono: 0 [0%] Simple mixer control 'ALC NG Type',0 Capabilities: enum Items: 'Constant Gain' 'Mute' Item0: 'Mute' Simple mixer control 'ALC Sidetone Mux',0 Capabilities: enum Items: 'Stereo' 'Left' 'Right' 'None' Item0: 'Stereo' Simple mixer control 'ALC Target',0 Capabilities: volume volume-joined penum Playback channels: Mono Capture channels: Mono Limits: 0 - 15 Mono: 0 [0%] Simple mixer control 'ALC ZC',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'ALC ZC Timeout',0 Capabilities: volume volume-joined penum Playback channels: Mono Capture channels: Mono Limits: 0 - 3 Mono: 0 [0%] Simple mixer control 'Differential Source',0 Capabilities: enum Items: 'Mic' 'Line' Item0: 'Mic' Simple mixer control 'Left Capture Select',0 Capabilities: enum Items: 'Mic' 'NC' 'NC' 'Speaker Mixer' 'Line' 'Headphone Mixer' 'Phone Mixer' 'Phone' Item0: 'NC' Simple mixer control 'Left HP Mixer Aux',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'Left HP Mixer Line Bypass',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [on] Simple mixer control 'Left HP Mixer Mic Sidetone',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'Left HP Mixer PCBeep Bypass',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'Left HP Mixer PCM',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [on] Simple mixer control 'Left HP Mixer Phone Bypass',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'Out3',0 Capabilities: volume volume-joined pswitch pswitch-joined penum Playback channels: Mono Capture channels: Mono Limits: 0 - 31 Mono: 0 [0%] Playback [off] Simple mixer control 'Out3 Mux',0 Capabilities: enum Items: 'Left' 'VREF' 'Left + Right' 'Mono' Item0: 'Mono' Simple mixer control 'Out3 ZC',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'PCBeep Bypass Headphone',0 Capabilities: volume volume-joined penum Playback channels: Mono Capture channels: Mono Limits: 0 - 7 Mono: 0 [0%] Simple mixer control 'PCBeep Bypass Phone',0 Capabilities: volume volume-joined penum Playback channels: Mono Capture channels: Mono Limits: 0 - 7 Mono: 0 [0%] Simple mixer control 'PCBeep Bypass Speaker',0 Capabilities: volume volume-joined penum Playback channels: Mono Capture channels: Mono Limits: 0 - 7 Mono: 0 [0%] Simple mixer control 'Right Capture Select',0 Capabilities: enum Items: 'Mic' 'NC' 'NC' 'Speaker Mixer' 'Line' 'Headphone Mixer' 'Phone Mixer' 'Phone' Item0: 'NC' Simple mixer control 'Right HP Mixer Aux',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [on] Simple mixer control 'Right HP Mixer Line Bypass',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [on] Simple mixer control 'Right HP Mixer Mic Sidetone',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [on] Simple mixer control 'Right HP Mixer PCBeep Bypass',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'Right HP Mixer PCM',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [on] Simple mixer control 'Right HP Mixer Phone Bypass',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] numid=8,iface=MIXER,name='Headphone Playback ZC Switch' numid=4,iface=MIXER,name='Headphone Playback Switch' numid=3,iface=MIXER,name='Headphone Playback Volume' numid=5,iface=MIXER,name='PCM Playback Volume' numid=35,iface=MIXER,name='Line Capture Volume' numid=51,iface=MIXER,name='Mic 1 Volume' numid=52,iface=MIXER,name='Mic 2 Volume' numid=53,iface=MIXER,name='Mic Boost Volume' numid=23,iface=MIXER,name='Mic Headphone Volume' numid=78,iface=MIXER,name='Mic Select Source' numid=60,iface=MIXER,name='Phone Mixer Aux Playback Switch' numid=61,iface=MIXER,name='Phone Mixer Line Bypass Switch' numid=63,iface=MIXER,name='Phone Mixer Mic 1 Sidetone Switch' numid=64,iface=MIXER,name='Phone Mixer Mic 2 Sidetone Switch' numid=59,iface=MIXER,name='Phone Mixer PCBeep Bypass Switch' numid=62,iface=MIXER,name='Phone Mixer PCM Playback Switch' numid=34,iface=MIXER,name='Phone Volume' numid=31,iface=MIXER,name='Aux Playback Headphone Volume' numid=33,iface=MIXER,name='Aux Playback Phone Volume' numid=32,iface=MIXER,name='Aux Playback Speaker Volume' numid=9,iface=MIXER,name='Mono Playback ZC Switch' numid=11,iface=MIXER,name='Mono Playback Switch' numid=10,iface=MIXER,name='Mono Playback Volume' numid=36,iface=MIXER,name='Capture 20dB Boost Switch' numid=47,iface=MIXER,name='Capture ADC Switch' numid=81,iface=MIXER,name='Capture Phone Mux' numid=50,iface=MIXER,name='Capture ZC Switch' numid=37,iface=MIXER,name='Capture to Phone 20dB Boost Switch' numid=49,iface=MIXER,name='Capture Volume' numid=48,iface=MIXER,name='Capture Volume Steps' numid=44,iface=MIXER,name='Playback Attenuate (-6dB) Switch' numid=39,iface=MIXER,name='3D Lower Cut-off Switch' numid=40,iface=MIXER,name='3D Playback Volume' numid=38,iface=MIXER,name='3D Upper Cut-off Switch' numid=15,iface=MIXER,name='ALC Attack Time' numid=14,iface=MIXER,name='ALC Decay Time' numid=16,iface=MIXER,name='ALC Function' numid=24,iface=MIXER,name='ALC Headphone Volume' numid=13,iface=MIXER,name='ALC Hold Time' numid=17,iface=MIXER,name='ALC Max Volume' numid=20,iface=MIXER,name='ALC NG Switch' numid=22,iface=MIXER,name='ALC NG Threshold' numid=21,iface=MIXER,name='ALC NG Type' numid=84,iface=MIXER,name='ALC Sidetone Mux' numid=12,iface=MIXER,name='ALC Target Volume' numid=19,iface=MIXER,name='ALC ZC Switch' numid=18,iface=MIXER,name='ALC ZC Timeout' numid=41,iface=MIXER,name='Bass Control' numid=42,iface=MIXER,name='Bass Cut-off Switch' numid=45,iface=MIXER,name='Bass Volume' numid=77,iface=MIXER,name='Differential Source' numid=80,iface=MIXER,name='Left Capture Select' numid=72,iface=MIXER,name='Left HP Mixer Aux Playback Switch' numid=74,iface=MIXER,name='Left HP Mixer Line Bypass Switch' numid=76,iface=MIXER,name='Left HP Mixer Mic Sidetone Switch' numid=71,iface=MIXER,name='Left HP Mixer PCBeep Bypass Switch' numid=75,iface=MIXER,name='Left HP Mixer PCM Playback Switch' numid=73,iface=MIXER,name='Left HP Mixer Phone Bypass Switch' numid=83,iface=MIXER,name='Out3 Mux' numid=25,iface=MIXER,name='Out3 Switch' numid=27,iface=MIXER,name='Out3 Volume' numid=26,iface=MIXER,name='Out3 ZC Switch' numid=28,iface=MIXER,name='PCBeep Bypass Headphone Volume' numid=30,iface=MIXER,name='PCBeep Bypass Phone Volume' numid=29,iface=MIXER,name='PCBeep Bypass Speaker Volume' numid=79,iface=MIXER,name='Right Capture Select' numid=66,iface=MIXER,name='Right HP Mixer Aux Playback Switch' numid=68,iface=MIXER,name='Right HP Mixer Line Bypass Switch' numid=70,iface=MIXER,name='Right HP Mixer Mic Sidetone Switch' numid=65,iface=MIXER,name='Right HP Mixer PCBeep Bypass Switch' numid=69,iface=MIXER,name='Right HP Mixer PCM Playback Switch' numid=67,iface=MIXER,name='Right HP Mixer Phone Bypass Switch' numid=55,iface=MIXER,name='Speaker Mixer Aux Playback Switch' numid=57,iface=MIXER,name='Speaker Mixer Line Bypass Switch' numid=54,iface=MIXER,name='Speaker Mixer PCBeep Bypass Switch' numid=58,iface=MIXER,name='Speaker Mixer PCM Playback Switch' numid=56,iface=MIXER,name='Speaker Mixer Phone Bypass Switch' numid=82,iface=MIXER,name='Speaker Mux' numid=7,iface=MIXER,name='Speaker Playback Invert Switch' numid=2,iface=MIXER,name='Speaker Playback Switch' numid=1,iface=MIXER,name='Speaker Playback Volume' numid=6,iface=MIXER,name='Speaker Playback ZC Switch' numid=43,iface=MIXER,name='Tone Cut-off Switch' numid=46,iface=MIXER,name='Treble Volume' numid=8,iface=MIXER,name='Headphone Playback ZC Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=4,iface=MIXER,name='Headphone Playback Switch' ; type=BOOLEAN,access=rw------,values=1 : values=on numid=3,iface=MIXER,name='Headphone Playback Volume' ; type=INTEGER,access=rw------,values=2,min=0,max=31,step=0 : values=20,20 numid=5,iface=MIXER,name='PCM Playback Volume' ; type=INTEGER,access=rw------,values=2,min=0,max=31,step=0 : values=17,17 numid=35,iface=MIXER,name='Line Capture Volume' ; type=INTEGER,access=rw------,values=2,min=0,max=31,step=0 : values=23,23 numid=51,iface=MIXER,name='Mic 1 Volume' ; type=INTEGER,access=rw---R--,values=1,min=0,max=31,step=0 : values=23 | dBscale-min=-34.50dB,step=1.50dB,mute=0 numid=52,iface=MIXER,name='Mic 2 Volume' ; type=INTEGER,access=rw---R--,values=1,min=0,max=31,step=0 : values=18 | dBscale-min=-34.50dB,step=1.50dB,mute=0 numid=53,iface=MIXER,name='Mic Boost Volume' ; type=INTEGER,access=rw---R--,values=1,min=0,max=1,step=0 : values=0 | dBscale-min=0.00dB,step=20.00dB,mute=0 numid=23,iface=MIXER,name='Mic Headphone Volume' ; type=INTEGER,access=rw------,values=1,min=0,max=7,step=0 : values=3 numid=78,iface=MIXER,name='Mic Select Source' ; type=ENUMERATED,access=rw------,values=1,items=4 ; Item #0 'Mic 1' ; Item #1 'Differential' ; Item #2 'Mic 2' ; Item #3 'Stereo' : values=0 numid=60,iface=MIXER,name='Phone Mixer Aux Playback Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=61,iface=MIXER,name='Phone Mixer Line Bypass Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=63,iface=MIXER,name='Phone Mixer Mic 1 Sidetone Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=64,iface=MIXER,name='Phone Mixer Mic 2 Sidetone Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=59,iface=MIXER,name='Phone Mixer PCBeep Bypass Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=62,iface=MIXER,name='Phone Mixer PCM Playback Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=34,iface=MIXER,name='Phone Volume' ; type=INTEGER,access=rw------,values=1,min=0,max=15,step=0 : values=14 numid=31,iface=MIXER,name='Aux Playback Headphone Volume' ; type=INTEGER,access=rw------,values=1,min=0,max=7,step=0 : values=0 numid=33,iface=MIXER,name='Aux Playback Phone Volume' ; type=INTEGER,access=rw------,values=1,min=0,max=7,step=0 : values=0 numid=32,iface=MIXER,name='Aux Playback Speaker Volume' ; type=INTEGER,access=rw------,values=1,min=0,max=7,step=0 : values=0 numid=9,iface=MIXER,name='Mono Playback ZC Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=11,iface=MIXER,name='Mono Playback Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=10,iface=MIXER,name='Mono Playback Volume' ; type=INTEGER,access=rw------,values=1,min=0,max=31,step=0 : values=0 numid=36,iface=MIXER,name='Capture 20dB Boost Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=47,iface=MIXER,name='Capture ADC Switch' ; type=BOOLEAN,access=rw------,values=1 : values=on numid=81,iface=MIXER,name='Capture Phone Mux' ; type=ENUMERATED,access=rw------,values=1,items=4 ; Item #0 'Stereo' ; Item #1 'Left' ; Item #2 'Right' ; Item #3 'Mute' : values=3 numid=50,iface=MIXER,name='Capture ZC Switch' ; type=BOOLEAN,access=rw------,values=1 : values=on numid=37,iface=MIXER,name='Capture to Phone 20dB Boost Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=49,iface=MIXER,name='Capture Volume' ; type=INTEGER,access=rw------,values=2,min=0,max=63,step=0 : values=13,13 numid=48,iface=MIXER,name='Capture Volume Steps' ; type=ENUMERATED,access=rw------,values=2,items=2 ; Item #0 '+1.5dB Steps' ; Item #1 '+0.75dB Steps' : values=1,1 numid=44,iface=MIXER,name='Playback Attenuate (-6dB) Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=39,iface=MIXER,name='3D Lower Cut-off Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=40,iface=MIXER,name='3D Playback Volume' ; type=INTEGER,access=rw------,values=1,min=0,max=15,step=0 : values=0 numid=38,iface=MIXER,name='3D Upper Cut-off Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=15,iface=MIXER,name='ALC Attack Time' ; type=INTEGER,access=rw------,values=1,min=0,max=15,step=0 : values=0 numid=14,iface=MIXER,name='ALC Decay Time' ; type=INTEGER,access=rw------,values=1,min=0,max=15,step=0 : values=0 numid=16,iface=MIXER,name='ALC Function' ; type=ENUMERATED,access=rw------,values=1,items=4 ; Item #0 'None' ; Item #1 'Left' ; Item #2 'Right' ; Item #3 'Stereo' : values=0 numid=24,iface=MIXER,name='ALC Headphone Volume' ; type=INTEGER,access=rw------,values=1,min=0,max=7,step=0 : values=0 numid=13,iface=MIXER,name='ALC Hold Time' ; type=INTEGER,access=rw------,values=1,min=0,max=15,step=0 : values=0 numid=17,iface=MIXER,name='ALC Max Volume' ; type=INTEGER,access=rw------,values=1,min=0,max=7,step=0 : values=0 numid=20,iface=MIXER,name='ALC NG Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=22,iface=MIXER,name='ALC NG Threshold' ; type=INTEGER,access=rw------,values=1,min=0,max=31,step=0 : values=0 numid=21,iface=MIXER,name='ALC NG Type' ; type=ENUMERATED,access=rw------,values=1,items=2 ; Item #0 'Constant Gain' ; Item #1 'Mute' : values=1 numid=84,iface=MIXER,name='ALC Sidetone Mux' ; type=ENUMERATED,access=rw------,values=1,items=4 ; Item #0 'Stereo' ; Item #1 'Left' ; Item #2 'Right' ; Item #3 'None' : values=0 numid=12,iface=MIXER,name='ALC Target Volume' ; type=INTEGER,access=rw------,values=1,min=0,max=15,step=0 : values=0 numid=19,iface=MIXER,name='ALC ZC Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=18,iface=MIXER,name='ALC ZC Timeout' ; type=INTEGER,access=rw------,values=1,min=0,max=3,step=0 : values=0 numid=41,iface=MIXER,name='Bass Control' ; type=ENUMERATED,access=rw------,values=1,items=2 ; Item #0 'Linear Control' ; Item #1 'Adaptive Boost' : values=0 numid=42,iface=MIXER,name='Bass Cut-off Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=45,iface=MIXER,name='Bass Volume' ; type=INTEGER,access=rw------,values=1,min=0,max=15,step=0 : values=0 numid=77,iface=MIXER,name='Differential Source' ; type=ENUMERATED,access=rw------,values=1,items=2 ; Item #0 'Mic' ; Item #1 'Line' : values=0 numid=80,iface=MIXER,name='Left Capture Select' ; type=ENUMERATED,access=rw------,values=1,items=8 ; Item #0 'Mic' ; Item #1 'NC' ; Item #2 'NC' ; Item #3 'Speaker Mixer' ; Item #4 'Line' ; Item #5 'Headphone Mixer' ; Item #6 'Phone Mixer' ; Item #7 'Phone' : values=1 numid=72,iface=MIXER,name='Left HP Mixer Aux Playback Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=74,iface=MIXER,name='Left HP Mixer Line Bypass Switch' ; type=BOOLEAN,access=rw------,values=1 : values=on numid=76,iface=MIXER,name='Left HP Mixer Mic Sidetone Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=71,iface=MIXER,name='Left HP Mixer PCBeep Bypass Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=75,iface=MIXER,name='Left HP Mixer PCM Playback Switch' ; type=BOOLEAN,access=rw------,values=1 : values=on numid=73,iface=MIXER,name='Left HP Mixer Phone Bypass Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=83,iface=MIXER,name='Out3 Mux' ; type=ENUMERATED,access=rw------,values=1,items=4 ; Item #0 'Left' ; Item #1 'VREF' ; Item #2 'Left + Right' ; Item #3 'Mono' : values=3 numid=25,iface=MIXER,name='Out3 Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=27,iface=MIXER,name='Out3 Volume' ; type=INTEGER,access=rw------,values=1,min=0,max=31,step=0 : values=0 numid=26,iface=MIXER,name='Out3 ZC Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=28,iface=MIXER,name='PCBeep Bypass Headphone Volume' ; type=INTEGER,access=rw------,values=1,min=0,max=7,step=0 : values=0 numid=30,iface=MIXER,name='PCBeep Bypass Phone Volume' ; type=INTEGER,access=rw------,values=1,min=0,max=7,step=0 : values=0 numid=29,iface=MIXER,name='PCBeep Bypass Speaker Volume' ; type=INTEGER,access=rw------,values=1,min=0,max=7,step=0 : values=0 numid=79,iface=MIXER,name='Right Capture Select' ; type=ENUMERATED,access=rw------,values=1,items=8 ; Item #0 'Mic' ; Item #1 'NC' ; Item #2 'NC' ; Item #3 'Speaker Mixer' ; Item #4 'Line' ; Item #5 'Headphone Mixer' ; Item #6 'Phone Mixer' ; Item #7 'Phone' : values=1 numid=66,iface=MIXER,name='Right HP Mixer Aux Playback Switch' ; type=BOOLEAN,access=rw------,values=1 : values=on numid=68,iface=MIXER,name='Right HP Mixer Line Bypass Switch' ; type=BOOLEAN,access=rw------,values=1 : values=on numid=70,iface=MIXER,name='Right HP Mixer Mic Sidetone Switch' ; type=BOOLEAN,access=rw------,values=1 : values=on numid=65,iface=MIXER,name='Right HP Mixer PCBeep Bypass Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=69,iface=MIXER,name='Right HP Mixer PCM Playback Switch' ; type=BOOLEAN,access=rw------,values=1 : values=on numid=67,iface=MIXER,name='Right HP Mixer Phone Bypass Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=55,iface=MIXER,name='Speaker Mixer Aux Playback Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=57,iface=MIXER,name='Speaker Mixer Line Bypass Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=54,iface=MIXER,name='Speaker Mixer PCBeep Bypass Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=58,iface=MIXER,name='Speaker Mixer PCM Playback Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=56,iface=MIXER,name='Speaker Mixer Phone Bypass Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=82,iface=MIXER,name='Speaker Mux' ; type=ENUMERATED,access=rw------,values=1,items=2 ; Item #0 'Speaker Mix' ; Item #1 'Headphone Mix' : values=0 numid=7,iface=MIXER,name='Speaker Playback Invert Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=2,iface=MIXER,name='Speaker Playback Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=1,iface=MIXER,name='Speaker Playback Volume' ; type=INTEGER,access=rw------,values=2,min=0,max=31,step=0 : values=6,6 numid=6,iface=MIXER,name='Speaker Playback ZC Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=43,iface=MIXER,name='Tone Cut-off Switch' ; type=BOOLEAN,access=rw------,values=1 : values=off numid=46,iface=MIXER,name='Treble Volume' ; type=INTEGER,access=rw------,values=1,min=0,max=15,step=0 : values=9

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[alsa-devel] Staying synced after underrun
by Paul D. DeRocco 15 May '12

15 May '12

I'm writing 48KHz stereo to Intel HD audio on my mobo, and I'd like to send it in parallel to both the analog and S/PDIF outputs, which share a clock source. If I open both devices, configure them with the same buffer space, and write the same data with snd_pcm_writei, how should I handle an underrun? Call snd_pcm_prepare on both device handles? If so, and the first device underruns, should I bother writing the buffer to the second device? -- Ciao, Paul D. DeRocco Paul mailto:pderocco@ix.netcom.com

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[alsa-devel] [PATCH] ASoC: twl6040: Support for DT
by Peter Ujfalusi 15 May '12

15 May '12

Enable Device Tree based loading of the codec driver. Example of dts section to load the twl6040-codec driver: twl6040: twl6040@4b { ... twl6040_codec: twl6040@0 { compatible = "ti,twl6040-codec"; interrupts = <1>; }; }; Signed-off-by: Peter Ujfalusi <peter.ujfalusi(a)ti.com> --- .../devicetree/bindings/sound/twl6040.txt | 26 ++++++++++++++++++++ sound/soc/codecs/twl6040.c | 8 ++++++ 2 files changed, 34 insertions(+), 0 deletions(-) create mode 100644 Documentation/devicetree/bindings/sound/twl6040.txt diff --git a/Documentation/devicetree/bindings/sound/twl6040.txt b/Documentation/devicetree/bindings/sound/twl6040.txt new file mode 100644 index 0000000..1f3dd70 --- /dev/null +++ b/Documentation/devicetree/bindings/sound/twl6040.txt @@ -0,0 +1,26 @@ +ASoC codec driver for the twl6040 family + +The ASoC codec driver is a child of the twl6040 MFD dirver. +Documentation/devicetree/bindings/mfd/twl6040.txt + +Required properties: +- compatible : Must be "ti,twl6040-codec"; +- interrupts: 1, Jack plug detection IRQ + +Example: +/* + * 8-channel high quality low-power audio codec + * http://www.ti.com/lit/ds/symlink/twl6040.pdf + */ +twl6040: twl6040@4b { + ... + twl6040_codec: twl6040@0 { + compatible = "ti,twl6040-codec"; + interrupts = <1>; + }; +}; + +sound { /* ASoC machine dirver */ + ... + dai-link,codec = <&twl6040_codec>; +}; diff --git a/sound/soc/codecs/twl6040.c b/sound/soc/codecs/twl6040.c index 0747260..85c6e0c 100644 --- a/sound/soc/codecs/twl6040.c +++ b/sound/soc/codecs/twl6040.c @@ -25,6 +25,7 @@ #include <linux/delay.h> #include <linux/pm.h> #include <linux/platform_device.h> +#include <linux/of_device.h> #include <linux/slab.h> #include <linux/mfd/twl6040.h> @@ -1229,10 +1230,17 @@ static int __devexit twl6040_codec_remove(struct platform_device *pdev) return 0; } +static const struct of_device_id twl6040_codec_of_match[] = { + {.compatible = "ti,twl6040-codec", }, + { }, +}; +MODULE_DEVICE_TABLE(of, twl6040_codec_of_match); + static struct platform_driver twl6040_codec_driver = { .driver = { .name = "twl6040-codec", .owner = THIS_MODULE, + .of_match_table = twl6040_codec_of_match, }, .probe = twl6040_codec_probe, .remove = __devexit_p(twl6040_codec_remove), -- 1.7.8.6

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[alsa-devel] snd_device_register / snd_device_disconnect
by Barratis 15 May '12

15 May '12

Hi All, I would have a question regarding the behavior of snd_device_register. Currently, the register operation will only be carried out if the state is SNDRV_DEV_BUILD. This effectively prevents device which have been disconnected via snd_device_disconnect (and thus having the state SNDRV_DEV_DISCONNECTED) to be registered again. Is this a wanted behavior? If so, I can't seem to find a reason for this as per my testing and code reading registering a device in DISCONNECTED sate works just fine. Thanks, -- Barratis

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