Hi All, I am trying to write ALSA driver for my audio card. I have initial driver version in place. aplay -l gives: **** List of PLAYBACK Hardware Devices **** card 0: default [], device 0: myMonoCard [] Subdevices: 1/1 Subdevice #0: subdevice #0

and aplay -L gives:

default:CARD=default Default Audio Device null Discard all samples (playback) or generate zero samples (capture)

It seems to me that all looks good here but when I try: aplay 101a.4.wav

Calling open method in the mono driver! (Output from my driver open method) Calling hw_free method (Output from my driver hw_free method) Calling close method in the mono driver! (Output from my driver close method) aplay: main:608: audio open error: Invalid argument

All my open method does is this: int ret; struct snd_pcm_runtime *runtime = substream->runtime; printk ("Calling open method in the mono driver!\n"); /*Associate the hardware capabilities of this PCM component */ runtime->hw = monocard_playback_mono; return 0;

and my struct snd_pcm_hardware monocard_playback_mono = { .info = (SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_PAUSE), .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE | SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U8, .rates = SNDRV_PCM_RATE_CONTINUOUS, .rate_min = 8000, .rate_min = 48000, .channels_min = 1, .channels_max = 1, .buffer_bytes_max=32768,

I am not sure if alsa-lib is saying that one of these arguments is invalid or what? Thank you Ogi