ASoC: component: Add generic PCM copy ops

For following the ALSA PCM core change, a new PCM copy ops is added
toe ASoC component framework: snd_soc_component_driver receives the
copy ops, and snd_soc_pcm_component_copy() helper is provided.

This also fixes a long-standing potential bug where the ASoC driver
covers only copy_user PCM callback and misses the copy from kernel
pointers (such as OSS PCM layer), too.

As of this patch, the old copy_user is still kept, but it'll be
dropped later after all drivers are converted.

Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230815190136.8987-19-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/include/sound/soc-component.h b/include/sound/soc-component.h
index 87f248a..8040f00 100644 (file)
--- a/include/sound/soc-component.h
+++ b/include/sound/soc-component.h
@@ -141,6 +141,10 @@ struct snd_soc_component_driver {
                         struct snd_pcm_substream *substream, int channel,
                         unsigned long pos, void __user *buf,
                         unsigned long bytes);
+       int (*copy)(struct snd_soc_component *component,
+                   struct snd_pcm_substream *substream, int channel,
+                   unsigned long pos, struct iov_iter *buf,
+                   unsigned long bytes);
        struct page *(*page)(struct snd_soc_component *component,
                             struct snd_pcm_substream *substream,
                             unsigned long offset);
@@ -512,6 +516,9 @@ int snd_soc_pcm_component_sync_stop(struct snd_pcm_substream *substream);
 int snd_soc_pcm_component_copy_user(struct snd_pcm_substream *substream,
                                    int channel, unsigned long pos,
                                    void __user *buf, unsigned long bytes);
+int snd_soc_pcm_component_copy(struct snd_pcm_substream *substream,
+                              int channel, unsigned long pos,
+                              struct iov_iter *buf, unsigned long bytes);
 struct page *snd_soc_pcm_component_page(struct snd_pcm_substream *substream,
                                        unsigned long offset);
 int snd_soc_pcm_component_mmap(struct snd_pcm_substream *substream,

diff --git a/sound/soc/soc-component.c b/sound/soc/soc-component.c
index 4356cc3..ffa2dd8 100644 (file)
--- a/sound/soc/soc-component.c
+++ b/sound/soc/soc-component.c
@@ -1052,6 +1052,24 @@ int snd_soc_pcm_component_sync_stop(struct snd_pcm_substream *substream)
        return 0;
 }
 
+int snd_soc_pcm_component_copy(struct snd_pcm_substream *substream,
+                              int channel, unsigned long pos,
+                              struct iov_iter *buf, unsigned long bytes)
+{
+       struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+       struct snd_soc_component *component;
+       int i;
+
+       /* FIXME. it returns 1st copy now */
+       for_each_rtd_components(rtd, i, component)
+               if (component->driver->copy)
+                       return soc_component_ret(component,
+                               component->driver->copy(component, substream,
+                                       channel, pos, buf, bytes));
+
+       return -EINVAL;
+}
+
 int snd_soc_pcm_component_copy_user(struct snd_pcm_substream *substream,
                                    int channel, unsigned long pos,
                                    void __user *buf, unsigned long bytes)

diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
index 8896227..71403da 100644 (file)
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -2973,7 +2973,9 @@ int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
                        rtd->ops.ioctl          = snd_soc_pcm_component_ioctl;
                if (drv->sync_stop)
                        rtd->ops.sync_stop      = snd_soc_pcm_component_sync_stop;
-               if (drv->copy_user)
+               if (drv->copy)
+                       rtd->ops.copy           = snd_soc_pcm_component_copy;
+               else if (drv->copy_user)
                        rtd->ops.copy_user      = snd_soc_pcm_component_copy_user;
                if (drv->page)
                        rtd->ops.page           = snd_soc_pcm_component_page;