ASoC: soc-compress: Add support for not memory mapped DSPs

The ASoC compressed API did not implement the copy callback in its
compressed ops which is required for DSPs that are not memory mapped.

This patch creates a local copy of the compress ops for each runtime and
modifies them with a copy callback as appropriate.
Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/soc-compress.c

@@ -302,6 +302,22 @@ static int soc_compr_pointer(struct snd_compr_stream *cstream,
 	return 0;
 }
 
+static int soc_compr_copy(struct snd_compr_stream *cstream,
+			  const char __user *buf, size_t count)
+{
+	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
+	struct snd_soc_platform *platform = rtd->platform;
+	int ret = 0;
+
+	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
+
+	if (platform->driver->compr_ops && platform->driver->compr_ops->copy)
+		ret = platform->driver->compr_ops->copy(cstream, buf, count);
+
+	mutex_unlock(&rtd->pcm_mutex);
+	return ret;
+}
+
 /* ASoC Compress operations */
 static struct snd_compr_ops soc_compr_ops = {
 	.open		= soc_compr_open,
@@ -319,6 +335,7 @@ static struct snd_compr_ops soc_compr_ops = {
 int soc_new_compress(struct snd_soc_pcm_runtime *rtd, int num)
 {
 	struct snd_soc_codec *codec = rtd->codec;
+	struct snd_soc_platform *platform = rtd->platform;
 	struct snd_soc_dai *codec_dai = rtd->codec_dai;
 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 	struct snd_compr *compr;
@@ -335,14 +352,25 @@ int soc_new_compress(struct snd_soc_pcm_runtime *rtd, int num)
 		return -ENOMEM;
 	}
 
-	compr->ops = &soc_compr_ops;
+	compr->ops = devm_kzalloc(rtd->card->dev, sizeof(soc_compr_ops),
+				  GFP_KERNEL);
+	if (compr->ops == NULL) {
+		dev_err(rtd->card->dev, "Cannot allocate compressed ops\n");
+		ret = -ENOMEM;
+		goto compr_err;
+	}
+	memcpy(compr->ops, &soc_compr_ops, sizeof(soc_compr_ops));
+
+	/* Add copy callback for not memory mapped DSPs */
+	if (platform->driver->compr_ops && platform->driver->compr_ops->copy)
+		compr->ops->copy = soc_compr_copy;
+
 	mutex_init(&compr->lock);
 	ret = snd_compress_new(rtd->card->snd_card, num, direction, compr);
 	if (ret < 0) {
 		pr_err("compress asoc: can't create compress for codec %s\n",
 			codec->name);
-		kfree(compr);
-		return ret;
+		goto compr_err;
 	}
 
 	/* DAPM dai link stream work */
@@ -354,4 +382,8 @@ int soc_new_compress(struct snd_soc_pcm_runtime *rtd, int num)
 	printk(KERN_INFO "compress asoc: %s <-> %s mapping ok\n", codec_dai->name,
 		cpu_dai->name);
 	return ret;
+
+compr_err:
+	kfree(compr);
+	return ret;
 }