[media] ivtv, ivtv-alsa: Add initial ivtv-alsa interface driver for ivtv

This is a cut-and-paste port of the cx18-alsa driver to
create an ivtv-alsa interface module for the ivtv driver.
It is not actually hooked-up to the PCM stream DMA buffers
from the ivtv driver yet.  That will be done in a coming change,
since that portion is so very different from the cx18 driver.
This code has all or more of the bugs and shortcomings of the
cx18-alsa interface driver: inconsistent use of itvsc->slock,
ivtv-alsa-mixer.c is dead code, assumes 48 ksps regardless
of the actual setting of the audio capture, problems with
proper struct ivtv and struct ivtv_stream housekeeping,
struct ivtv_open_id.v4l2_fh abuse, and $DIETY knows what else.

Signed-off-by: Andy Walls <awalls@md.metrocast.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/media/pci/ivtv/ivtv-driver.h b/drivers/media/pci/ivtv/ivtv-driver.h
index a7e00f8..1918e73 100644
--- a/drivers/media/pci/ivtv/ivtv-driver.h
+++ b/drivers/media/pci/ivtv/ivtv-driver.h
@@ -669,6 +669,13 @@ struct ivtv {
 	atomic_t capturing;		/* count number of active capture streams */
 	atomic_t decoding;		/* count number of active decoding streams */
 
+	/* ALSA interface for PCM capture stream */
+	struct snd_ivtv_card *alsa;
+	void (*pcm_announce_callback)(struct snd_ivtv_card *card, u8 *pcm_data,
+				      size_t num_bytes);
+
+	/* Used for ivtv-alsa module loading */
+	struct work_struct request_module_wk;
 
 	/* Interrupts & DMA */
 	u32 irqmask;                    /* active interrupts */
@@ -752,6 +759,9 @@ static inline struct ivtv *to_ivtv(struct v4l2_device *v4l2_dev)
 	return container_of(v4l2_dev, struct ivtv, v4l2_dev);
 }
 
+/* ivtv extensions to be loaded */
+extern int (*ivtv_ext_init)(struct ivtv *);
+
 /* Globals */
 extern int ivtv_first_minor;