V4L/DVB: tm6000: Add a callback code for buffer fill

Implements a callback to be used by tm6000-alsa, in order to allow filling
audio data packets.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/staging/tm6000/tm6000-alsa.c

@@ -200,6 +200,21 @@ static int snd_tm6000_close(struct snd_pcm_substream *substream)
 	return 0;
 }
 
+static int tm6000_fillbuf(struct tm6000_core *core, char *buf, int size)
+{
+	int i;
+
+	/* Need to add a real code to copy audio buffer */
+	printk("Audio (%i bytes): ", size);
+	for (i = 0; i < size - 3; i +=4)
+		printk("(0x%04x, 0x%04x), ",
+			*(u16 *)(buf + i), *(u16 *)(buf + i + 2));
+
+	printk("\n");
+
+	return 0;
+}
+
 /*
  * hw_params callback
  */
@@ -396,6 +411,7 @@ struct tm6000_ops audio_ops = {
 	.name	= "TM6000 Audio Extension",
 	.init	= tm6000_audio_init,
 	.fini	= tm6000_audio_fini,
+	.fillbuf = tm6000_fillbuf,
 };
 
 static int __init tm6000_alsa_register(void)

drivers/staging/tm6000/tm6000-core.c

@@ -653,6 +653,23 @@ void tm6000_add_into_devlist(struct tm6000_core *dev)
 static LIST_HEAD(tm6000_extension_devlist);
 static DEFINE_MUTEX(tm6000_extension_devlist_lock);
 
+int tm6000_call_fillbuf(struct tm6000_core *dev, enum tm6000_ops_type type,
+			char *buf, int size)
+{
+	struct tm6000_ops *ops = NULL;
+
+	/* FIXME: tm6000_extension_devlist_lock should be a spinlock */
+
+	if (!list_empty(&tm6000_extension_devlist)) {
+		list_for_each_entry(ops, &tm6000_extension_devlist, next) {
+			if (ops->fillbuf && ops->type == type)
+				ops->fillbuf(dev, buf, size);
+		}
+	}
+
+	return 0;
+}
+
 int tm6000_register_extension(struct tm6000_ops *ops)
 {
 	struct tm6000_core *dev = NULL;

drivers/staging/tm6000/tm6000-video.c

@@ -301,7 +301,7 @@ static int copy_streams(u8 *data, unsigned long len,
 					memcpy (&voutp[pos], ptr, cpysize);
 				break;
 			case TM6000_URB_MSG_AUDIO:
-				/* Need some code to copy audio buffer */
+				tm6000_call_fillbuf(dev, TM6000_AUDIO, ptr, cpysize);
 				break;
 			case TM6000_URB_MSG_VBI:
 				/* Need some code to copy vbi buffer */

drivers/staging/tm6000/tm6000.h

@@ -229,6 +229,7 @@ struct tm6000_ops {
 	enum tm6000_ops_type	type;
 	int (*init)(struct tm6000_core *);
 	int (*fini)(struct tm6000_core *);
+	int (*fillbuf)(struct tm6000_core *, char *buf, int size);
 };
 
 struct tm6000_fh {
@@ -278,6 +279,9 @@ int tm6000_register_extension(struct tm6000_ops *ops);
 void tm6000_unregister_extension(struct tm6000_ops *ops);
 void tm6000_init_extension(struct tm6000_core *dev);
 void tm6000_close_extension(struct tm6000_core *dev);
+int tm6000_call_fillbuf(struct tm6000_core *dev, enum tm6000_ops_type type,
+			char *buf, int size);
+
 
 /* In tm6000-stds.c */
 void tm6000_get_std_res(struct tm6000_core *dev);