Thank you so much for your suggestion. I've already copied a codec source for wm8980 from linux-2.6-ASoC main trunk. I have already to modify it back to the old api's and old structures for kernel v2.6.21. What remains I can't get through are those points I listed in my previous email. Could you give me some hints? Best Regards, LEUNG, Chi Tat Senior Software Engineer CCT Tech Advanced Products Limited 18/F, CCT Telecom Building, 11 Wo Shing Street Fo Tan, Shatin, N.T., Hong Kong Tel: +852 26005276 Fax: +852 26948660 Email: ctleung@xxxxxxxxxx Website: http://www.cct-tech.com.hk -----Original Message----- From: Jon Smirl [mailto:jonsmirl@xxxxxxxxx] Sent: Monday, May 25, 2009 11:45 AM To: Leung Chi Tat Cc: alsa-devel@xxxxxxxxxxxxxxxx Subject: Re: Help on writing an ALSA ASoC Driver for WM8985 On Sun, May 24, 2009 at 11:31 PM, Leung Chi Tat <ctleung@xxxxxxxxxx> wrote: > Hi all, > > I'm new to ALSA ASoC and ALSA. I'd like get some advice where I can get more information about writing an ASoC driver. I've browsed the internet couples of days and I can only find links on ALSA driver api's and writing an ALSA driver for PCI devices. > > It seems there is not much information on how to writing an ALSA ASoC driver. I'm stuck on the following questions: > 1. describing those important structures, e.g. struct soc_enum, struct snd_kcontrol_new, struct snd_soc_dapm_widget; > 2. what is/are the relationships among those important structures; > 3. what is the differences between those controls for struct snd_kcontrol_new and struct snd_soc_dapm_widget; > 4. Should those sinks, sources, paths be defined in the arrays of struct snd_dapm_widget; > 5. How can I select those defined paths through ALSA user-mode library as I can't find any examples in those ALSA tutorials; > > Indeed, I'm right now trying to write a WM8985 driver for my s3c6400 based platform based on the kernel source v2.6.21 from Samsung. Look in sound/soc/codecs. There are implementations for many similar Wolfson chips. Just cut and paste them together to make the wm8985. > > Thank you so much for your valuable advice and suggestions in advance. > > Best Regards, > LEUNG, Chi Tat > Senior Software Engineer > CCT Tech Advanced Products Limited > 18/F, CCT Telecom Building, 11 Wo Shing Street > Fo Tan, Shatin, N.T., Hong Kong > Tel: +852 26005276 Fax: +852 26948660 > Email: ctleung@xxxxxxxxxx > Website: http://www.cct-tech.com.hk > > _______________________________________________ > Alsa-devel mailing list > Alsa-devel@xxxxxxxxxxxxxxxx > http://mailman.alsa-project.org/mailman/listinfo/alsa-devel > -- Jon Smirl jonsmirl@xxxxxxxxx _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
