Hi Mark and all,

I'm working on an ASoC machine driver to include the support for WM8904. The ARM SoC is AT91SAM9G45 from Atmel. In Atmel's original reference board, Atmel uses WM8731 which works quite well. For my case, I replaced it with WM8904. Both Atmel's ref board and mine use I2S to talk with audio codec. So far, the audio playback is OK. But audio capture can not work well.

The *hardware connection* in my case is,

external 32768Hz crystal --> MCLK (Use FLL to get proper sysclk) Line In Jack --> IN2L Line In Jack --> IN2R MiC --> IN1L HeadPhone --> HPOUTL HeadPhone --> HPOUTR

NC Pins: LINEOUTL, LINEOUTR, LINEOUTFB, IN1R

Codec is in master mode, ARM Soc is in slave mode.

My questions are, 1) Since WM8731 works fine (both playback and capture) on Atmel's ref board, and playback is also OK for my case, can we get the conclusion that the PCM driver and DAI driver are OK? Does the clock configuration for my case also look OK?

2) In my machine driver, I added the following DAPM components, static const struct snd_soc_dapm_widget mini_dapm_widgets[] = { SND_SOC_DAPM_HP("Headphone Jack", NULL), SND_SOC_DAPM_MIC("Mic Jack", NULL), SND_SOC_DAPM_LINE("LineIn Jack", NULL), };

static const struct snd_soc_dapm_route intercon[] = { /* headphone jack connected to HPOUT */ {"Headphone Jack", NULL, "HPOUTL"}, {"Headphone Jack", NULL, "HPOUTR"},

{"MICBIAS", NULL, "Mic Jack"}, {"IN1L", NULL, "MICBIAS"}, {"IN2R", NULL, "LineIn Jack"}, {"IN2L", NULL, "LineIn Jack"}, }; - and - then, { snd_soc_dapm_nc_pin(dapm, "IN1R"); snd_soc_dapm_nc_pin(dapm, "IN3L"); snd_soc_dapm_nc_pin(dapm, "IN3R"); snd_soc_dapm_nc_pin(dapm, "LINEOUTL"); snd_soc_dapm_nc_pin(dapm, "LINEOUTR");

snd_soc_dapm_new_controls(dapm, mini_dapm_widgets, ARRAY_SIZE(mini_dapm_widgets)); snd_soc_dapm_add_routes(dapm, intercon, ARRAY_SIZE(intercon));

snd_soc_dapm_enable_pin(dapm, "Headphone Jack"); snd_soc_dapm_enable_pin(dapm, "Mic Jack"); snd_soc_dapm_enable_pin(dapm, "LineIn Jack");

snd_soc_dapm_sync(dapm); }

Does the above code look fine?

3) I used "arecord -d 8 -f S16_LE -c2 -r8000 8000.wav" to capture audio. But the captured data are something looks like 84 FF 73 FF 83 FF 70 FF 85 FF 72 FF 84 FF 71 FF 83 FF 72 FF 84 FF 72 FF 87 FF 71 FF 83 FF 71 FF (RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, stereo 8000 Hz) The captured file can not be played well (no sound actually)

Both arecord, PCM driver, DAI driver and snd core driver are quiet without any warning or error. I tried to use alsamixer to configure the audo path. But I'm new to ALSA and not sure about the configuration. I just paste the amixer here, could you please point me where I've made mistakes? A piece of amixer scripts will greatly help me. :)

Thanks in advance.

Simple mixer control 'Headphone',0 Capabilities: volume pswitch penum Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: 0 - 63 Front Left: 46 [73%] [-11.00dB] Playback [on] Front Right: 45 [71%] [-12.00dB] Playback [on] Simple mixer control 'Headphone ZC',0 Capabilities: pswitch penum Playback channels: Front Left - Front Right Mono: Front Left: Playback [on] Front Right: Playback [on] Simple mixer control 'Line Output',0 Capabilities: volume pswitch penum Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: 0 - 63 Front Left: 57 [90%] [0.00dB] Playback [on] Front Right: 57 [90%] [0.00dB] Playback [on] Simple mixer control 'Line Output ZC',0 Capabilities: pswitch penum Playback channels: Front Left - Front Right Mono: Front Left: Playback [on] Front Right: Playback [on] Simple mixer control 'Capture',0 Capabilities: cvolume cswitch penum Capture channels: Front Left - Front Right Limits: Capture 0 - 31 Front Left: Capture 5 [16%] [on] Front Right: Capture 5 [16%] [on] Simple mixer control 'ADC 128x OSR',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [on] Simple mixer control 'AIFOUTL Mux',0 Capabilities: enum Items: 'Left' 'Right' Item0: 'Left' Simple mixer control 'AIFOUTR Mux',0 Capabilities: enum Items: 'Left' 'Right' Item0: 'Right' Simple mixer control 'DAC Deemphasis',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'DAC OSRx2',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'DACL Mux',0 Capabilities: enum Items: 'Left' 'Right' Item0: 'Left' Simple mixer control 'DACR Mux',0 Capabilities: enum Items: 'Left' 'Right' Item0: 'Right' Simple mixer control 'DRC',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'DRC Path',0 Capabilities: enum Items: 'ADC' 'DAC' Item0: 'ADC' Simple mixer control 'Digital',0 Capabilities: pvolume cvolume penum Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: Playback 0 - 96 Capture 0 - 119 Front Left: Playback 96 [100%] [0.00dB] Capture 96 [81%] [0.00dB] Front Right: Playback 96 [100%] [0.00dB] Capture 96 [81%] [0.00dB] Simple mixer control 'Digital Playback Boost',0 Capabilities: volume volume-joined penum Playback channels: Mono Capture channels: Mono Limits: 0 - 3 Mono: 0 [0%] [0.00dB] Simple mixer control 'Digital Sidetone',0 Capabilities: volume penum Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: 0 - 15 Front Left: 0 [0%] [-36.00dB] Front Right: 0 [0%] [-36.00dB] Simple mixer control 'EQ',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'EQ1',0 Capabilities: volume volume-joined penum Playback channels: Mono Capture channels: Mono Limits: 0 - 24 Mono: 12 [50%] [0.00dB] Simple mixer control 'EQ2',0 Capabilities: volume volume-joined penum Playback channels: Mono Capture channels: Mono Limits: 0 - 24 Mono: 12 [50%] [0.00dB] Simple mixer control 'EQ3',0 Capabilities: volume volume-joined penum Playback channels: Mono Capture channels: Mono Limits: 0 - 24 Mono: 12 [50%] [0.00dB] Simple mixer control 'EQ4',0 Capabilities: volume volume-joined penum Playback channels: Mono Capture channels: Mono Limits: 0 - 24 Mono: 12 [50%] [0.00dB] Simple mixer control 'EQ5',0 Capabilities: volume volume-joined penum Playback channels: Mono Capture channels: Mono Limits: 0 - 24 Mono: 12 [50%] [0.00dB] Simple mixer control 'HPL Mux',0 Capabilities: enum Items: 'DAC' 'Bypass' Item0: 'DAC' Simple mixer control 'HPR Mux',0 Capabilities: enum Items: 'DAC' 'Bypass' Item0: 'DAC' Simple mixer control 'High Pass Filter',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [on] Simple mixer control 'High Pass Filter Mode',0 Capabilities: enum Items: 'Hi-fi' 'Voice 1' 'Voice 2' 'Voice 3' Item0: 'Hi-fi' Simple mixer control 'LINEL Mux',0 Capabilities: enum Items: 'DAC' 'Bypass' Item0: 'DAC' Simple mixer control 'LINER Mux',0 Capabilities: enum Items: 'DAC' 'Bypass' Item0: 'DAC' Simple mixer control 'Left Capture Inverting Mux',0 Capabilities: enum Items: 'IN1L' 'IN2L' 'IN3L' Item0: 'IN1L' Simple mixer control 'Left Capture Mux',0 Capabilities: enum Items: 'IN1L' 'IN2L' 'IN3L' Item0: 'IN2L' Simple mixer control 'Left Caputure Mode',0 Capabilities: enum Items: 'Single-Ended' 'Differential Line' 'Differential Mic' Item0: 'Single-Ended' Simple mixer control 'Left Sidetone',0 Capabilities: enum Items: 'None' 'Left' 'Right' Item0: 'None' Simple mixer control 'Right Capture Inverting Mux',0 Capabilities: enum Items: 'IN1R' 'IN2R' 'IN3R' Item0: 'IN1R' Simple mixer control 'Right Capture Mode',0 Capabilities: enum Items: 'Single-Ended' 'Differential Line' 'Differential Mic' Item0: 'Single-Ended' Simple mixer control 'Right Capture Mux',0 Capabilities: enum Items: 'IN1R' 'IN2R' 'IN3R' Item0: 'IN2R' Simple mixer control 'Right Sidetone',0 Capabilities: enum Items: 'None' 'Left' 'Right' Item0: 'None'