[PATCH] ASoC: core - Add platform read and write.

[PATCH] ASoC: core - Add platform read and write.

[Liam Girdwood]

In preparation for ASoC Dynamic PCM (AKA DSP) support.

Allow platform driver to perform IO. Intended for platform DAPM.

Signed-off-by: Liam Girdwood <lrg@ti.com>
---
 include/sound/soc.h  |    8 ++++++++
 sound/soc/soc-core.c |   30 ++++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+), 0 deletions(-)

diff --git a/include/sound/soc.h b/include/sound/soc.h
index 6424b10..f30f3fe 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -312,6 +312,10 @@ int snd_soc_default_readable_register(struct snd_soc_codec *codec,
 				      unsigned int reg);
 int snd_soc_default_writable_register(struct snd_soc_codec *codec,
 				      unsigned int reg);
+int snd_soc_platform_read(struct snd_soc_platform *platform,
+					unsigned int reg);
+int snd_soc_platform_write(struct snd_soc_platform *platform,
+					unsigned int reg, unsigned int val);
 
 /* Utility functions to get clock rates from various things */
 int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots);
@@ -658,6 +662,10 @@ struct snd_soc_platform_driver {
 	/* probe ordering - for components with runtime dependencies */
 	int probe_order;
 	int remove_order;
+
+	/* platform IO - used for platform DAPM */
+	unsigned int (*read)(struct snd_soc_platform *, unsigned int);
+	int (*write)(struct snd_soc_platform *, unsigned int, unsigned int);
 };
 
 struct snd_soc_platform {
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index d49f0ed..d08abf4 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -1640,6 +1640,36 @@ int snd_soc_codec_writable_register(struct snd_soc_codec *codec,
 }
 EXPORT_SYMBOL_GPL(snd_soc_codec_writable_register);
 
+int snd_soc_platform_read(struct snd_soc_platform *platform,
+					unsigned int reg)
+{
+	unsigned int ret;
+
+	if (!platform->driver->read) {
+		dev_err(platform->dev, "platform has no read back\n");
+		return -1;
+	}
+
+	ret = platform->driver->read(platform, reg);
+	dev_dbg(platform->dev, "read %x => %x\n", reg, ret);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(snd_soc_platform_read);
+
+int snd_soc_platform_write(struct snd_soc_platform *platform,
+					 unsigned int reg, unsigned int val)
+{
+	if (!platform->driver->write) {
+		dev_err(platform->dev, "platform has no write back\n");
+		return -1;
+	}
+
+	dev_dbg(platform->dev, "write %x = %x\n", reg, val);
+	return platform->driver->write(platform, reg, val);
+}
+EXPORT_SYMBOL_GPL(snd_soc_platform_write);
+
 /**
  * snd_soc_new_ac97_codec - initailise AC97 device
  * @codec: audio codec
-- 
1.7.4.1

Re: [PATCH] ASoC: core - Add platform read and write.

[Mark Brown]

On Mon, Jul 04, 2011 at 11:10:15AM +0100, Liam Girdwood wrote:

> +int snd_soc_platform_read(struct snd_soc_platform *platform,
> +					unsigned int reg)
> +{
> +	unsigned int ret;
> +
> +	if (!platform->driver->read) {
> +		dev_err(platform->dev, "platform has no read back\n");
> +		return -1;
> +	}
> +
> +	ret = platform->driver->read(platform, reg);
> +	dev_dbg(platform->dev, "read %x => %x\n", reg, ret);

We should add tracepoints into these as well.

> +int snd_soc_platform_write(struct snd_soc_platform *platform,
> +					 unsigned int reg, unsigned int val)
> +{
> +	if (!platform->driver->write) {
> +		dev_err(platform->dev, "platform has no write back\n");
> +		return -1;

Could return -EINVAL or something here - it's not like read where we're
mixing with the in band data.

Re: [PATCH] ASoC: core - Add platform read and write.

[Liam Girdwood]

On 04/07/11 20:41, Mark Brown wrote:
> On Mon, Jul 04, 2011 at 11:10:15AM +0100, Liam Girdwood wrote:
> 
>> +int snd_soc_platform_read(struct snd_soc_platform *platform,
>> +					unsigned int reg)
>> +{
>> +	unsigned int ret;
>> +
>> +	if (!platform->driver->read) {
>> +		dev_err(platform->dev, "platform has no read back\n");
>> +		return -1;
>> +	}
>> +
>> +	ret = platform->driver->read(platform, reg);
>> +	dev_dbg(platform->dev, "read %x => %x\n", reg, ret);
> 
> We should add tracepoints into these as well.

Ah, forgot to send that one with this one. It's on it's way now ;)

> 
>> +int snd_soc_platform_write(struct snd_soc_platform *platform,
>> +					 unsigned int reg, unsigned int val)
>> +{
>> +	if (!platform->driver->write) {
>> +		dev_err(platform->dev, "platform has no write back\n");
>> +		return -1;
> 
> Could return -EINVAL or something here - it's not like read where we're
> mixing with the in band data.

I was thinking that too, but consistency with the codec IO would mean return -1. 

However, I've no real preference. I happy to change to EINVAL.

Liam

Re: [PATCH] ASoC: core - Add platform read and write.

[Mark Brown]

On Mon, Jul 04, 2011 at 10:14:05PM +0100, Liam Girdwood wrote:
> On 04/07/11 20:41, Mark Brown wrote:

> > Could return -EINVAL or something here - it's not like read where we're
> > mixing with the in band data.

> I was thinking that too, but consistency with the codec IO would mean return -1. 
> 
> However, I've no real preference. I happy to change to EINVAL.

Should probably fix the CODEC code as well.

Re: [PATCH] ASoC: core - Add platform read and write.

[Mark Brown]

On Mon, Jul 04, 2011 at 11:10:15AM +0100, Liam Girdwood wrote:
> In preparation for ASoC Dynamic PCM (AKA DSP) support.
> 
> Allow platform driver to perform IO. Intended for platform DAPM.

Sorry, also meant to add at the top that I applied the patch!