1 files changed, 150 insertions, 0 deletions
diff --git a/drivers/media/pci/cobalt/cobalt-alsa-main.c b/drivers/media/pci/cobalt/cobalt-alsa-main.c
new file mode 100644
index 0000000000..c57f87a682
--- /dev/null
+++ b/drivers/media/pci/cobalt/cobalt-alsa-main.c
@@ -0,0 +1,150 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  ALSA interface to cobalt PCM capture streams
+ *
+ *  Copyright 2014-2015 Cisco Systems, Inc. and/or its affiliates.
+ *  All rights reserved.
+ */
+
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/spinlock.h>
+
+#include <media/v4l2-device.h>
+
+#include <sound/core.h>
+#include <sound/initval.h>
+
+#include "cobalt-driver.h"
+#include "cobalt-alsa.h"
+#include "cobalt-alsa-pcm.h"
+
+static void snd_cobalt_card_free(struct snd_cobalt_card *cobsc)
+{
+	if (cobsc == NULL)
+		return;
+
+	cobsc->s->alsa = NULL;
+
+	kfree(cobsc);
+}
+
+static void snd_cobalt_card_private_free(struct snd_card *sc)
+{
+	if (sc == NULL)
+		return;
+	snd_cobalt_card_free(sc->private_data);
+	sc->private_data = NULL;
+	sc->private_free = NULL;
+}
+
+static int snd_cobalt_card_create(struct cobalt_stream *s,
+				       struct snd_card *sc,
+				       struct snd_cobalt_card **cobsc)
+{
+	*cobsc = kzalloc(sizeof(struct snd_cobalt_card), GFP_KERNEL);
+	if (*cobsc == NULL)
+		return -ENOMEM;
+
+	(*cobsc)->s = s;
+	(*cobsc)->sc = sc;
+
+	sc->private_data = *cobsc;
+	sc->private_free = snd_cobalt_card_private_free;
+
+	return 0;
+}
+
+static int snd_cobalt_card_set_names(struct snd_cobalt_card *cobsc)
+{
+	struct cobalt_stream *s = cobsc->s;
+	struct cobalt *cobalt = s->cobalt;
+	struct snd_card *sc = cobsc->sc;
+
+	/* sc->driver is used by alsa-lib's configurator: simple, unique */
+	strscpy(sc->driver, "cobalt", sizeof(sc->driver));
+
+	/* sc->shortname is a symlink in /proc/asound: COBALT-M -> cardN */
+	snprintf(sc->shortname,  sizeof(sc->shortname), "cobalt-%d-%d",
+		 cobalt->instance, s->video_channel);
+
+	/* sc->longname is read from /proc/asound/cards */
+	snprintf(sc->longname, sizeof(sc->longname),
+		 "Cobalt %d HDMI %d",
+		 cobalt->instance, s->video_channel);
+
+	return 0;
+}
+
+int cobalt_alsa_init(struct cobalt_stream *s)
+{
+	struct cobalt *cobalt = s->cobalt;
+	struct snd_card *sc = NULL;
+	struct snd_cobalt_card *cobsc;
+	int ret;
+
+	/* Numbrs steps from "Writing an ALSA Driver" by Takashi Iwai */
+
+	/* (1) Check and increment the device index */
+	/* This is a no-op for us.  We'll use the cobalt->instance */
+
+	/* (2) Create a card instance */
+	ret = snd_card_new(&cobalt->pci_dev->dev, SNDRV_DEFAULT_IDX1,
+			   SNDRV_DEFAULT_STR1, THIS_MODULE, 0, &sc);
+	if (ret) {
+		cobalt_err("snd_card_new() failed with err %d\n", ret);
+		goto err_exit;
+	}
+
+	/* (3) Create a main component */
+	ret = snd_cobalt_card_create(s, sc, &cobsc);
+	if (ret) {
+		cobalt_err("snd_cobalt_card_create() failed with err %d\n",
+			   ret);
+		goto err_exit_free;
+	}
+
+	/* (4) Set the driver ID and name strings */
+	snd_cobalt_card_set_names(cobsc);
+
+	ret = snd_cobalt_pcm_create(cobsc);
+	if (ret) {
+		cobalt_err("snd_cobalt_pcm_create() failed with err %d\n",
+			   ret);
+		goto err_exit_free;
+	}
+	/* FIXME - proc files */
+
+	/* (7) Set the driver data and return 0 */
+	/* We do this out of normal order for PCI drivers to avoid races */
+	s->alsa = cobsc;
+
+	/* (6) Register the card instance */
+	ret = snd_card_register(sc);
+	if (ret) {
+		s->alsa = NULL;
+		cobalt_err("snd_card_register() failed with err %d\n", ret);
+		goto err_exit_free;
+	}
+
+	return 0;
+
+err_exit_free:
+	if (sc != NULL)
+		snd_card_free(sc);
+	kfree(cobsc);
+err_exit:
+	return ret;
+}
+
+void cobalt_alsa_exit(struct cobalt_stream *s)
+{
+	struct snd_cobalt_card *cobsc = s->alsa;
+
+	if (cobsc)
+		snd_card_free(cobsc->sc);
+	s->alsa = NULL;
+}