[alsa-devel] [PATCH v2 2/4] ALSA pcm: allow non constant snd_pcm_chmap_elem

[Arnaud Pouliquen]

For HDMI, channel mapping can be retrieved from ELD. In this case mapping
can change during runtime (plug/unplug).
This patch suppresses the 'const' property of the struct chmap.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen at st.com>
---
 include/sound/pcm.h  | 4 ++--
 sound/core/pcm_lib.c | 6 +++---
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index af1fb37..3b459a3 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -1355,7 +1355,7 @@ struct snd_pcm_chmap {
 	struct snd_pcm *pcm;	/* assigned PCM instance */
 	int stream;		/* PLAYBACK or CAPTURE */
 	struct snd_kcontrol *kctl;
-	const struct snd_pcm_chmap_elem *chmap;
+	struct snd_pcm_chmap_elem *chmap;
 	unsigned int max_channels;
 	unsigned int channel_mask;	/* optional: active channels bitmask */
 	void *private_data;	/* optional: private data pointer */
@@ -1387,7 +1387,7 @@ extern const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[];
 #define SND_PCM_CHMAP_MASK_2468	(SND_PCM_CHMAP_MASK_246 | (1U << 8))
 
 int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
-			   const struct snd_pcm_chmap_elem *chmap,
+			   struct snd_pcm_chmap_elem *chmap,
 			   int max_channels,
 			   unsigned long private_value,
 			   struct snd_pcm_chmap **info_ret);
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index bb12615..252a498 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -2489,7 +2489,7 @@ static int pcm_chmap_ctl_get(struct snd_kcontrol *kcontrol,
 	struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
 	unsigned int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
 	struct snd_pcm_substream *substream;
-	const struct snd_pcm_chmap_elem *map;
+	struct snd_pcm_chmap_elem *map;
 
 	if (snd_BUG_ON(!info->chmap))
 		return -EINVAL;
@@ -2519,7 +2519,7 @@ static int pcm_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
 			     unsigned int size, unsigned int __user *tlv)
 {
 	struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
-	const struct snd_pcm_chmap_elem *map;
+	struct snd_pcm_chmap_elem *map;
 	unsigned int __user *dst;
 	int c, count = 0;
 
@@ -2578,7 +2578,7 @@ static void pcm_chmap_ctl_private_free(struct snd_kcontrol *kcontrol)
  * Return: Zero if successful, or a negative error value.
  */
 int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
-			   const struct snd_pcm_chmap_elem *chmap,
+			   struct snd_pcm_chmap_elem *chmap,
 			   int max_channels,
 			   unsigned long private_value,
 			   struct snd_pcm_chmap **info_ret)
-- 
1.9.1