1 files changed, 274 insertions, 0 deletions
diff --git a/drivers/media/pci/ivtv/ivtv-alsa-main.c b/drivers/media/pci/ivtv/ivtv-alsa-main.c
new file mode 100644
index 000000000..9e13a7128
--- /dev/null
+++ b/drivers/media/pci/ivtv/ivtv-alsa-main.c
@@ -0,0 +1,274 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  ALSA interface to ivtv PCM capture streams
+ *
+ *  Copyright (C) 2009,2012  Andy Walls <awalls@md.metrocast.net>
+ *  Copyright (C) 2009  Devin Heitmueller <dheitmueller@kernellabs.com>
+ *
+ *  Portions of this work were sponsored by ONELAN Limited for the cx18 driver
+ */
+
+#include "ivtv-driver.h"
+#include "ivtv-version.h"
+#include "ivtv-alsa.h"
+#include "ivtv-alsa-pcm.h"
+
+#include <sound/core.h>
+#include <sound/initval.h>
+
+int ivtv_alsa_debug;
+static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
+
+#define IVTV_DEBUG_ALSA_INFO(__fmt, __arg...) \
+	do { \
+		if (ivtv_alsa_debug & 2) \
+			printk(KERN_INFO pr_fmt("%s: alsa:" __fmt),	\
+			       __func__, ##__arg);			\
+	} while (0)
+
+module_param_named(debug, ivtv_alsa_debug, int, 0644);
+MODULE_PARM_DESC(debug,
+		 "Debug level (bitmask). Default: 0\n"
+		 "\t\t\t  1/0x0001: warning\n"
+		 "\t\t\t  2/0x0002: info\n");
+
+module_param_array(index, int, NULL, 0444);
+MODULE_PARM_DESC(index,
+		 "Index value for IVTV ALSA capture interface(s).\n");
+
+MODULE_AUTHOR("Andy Walls");
+MODULE_DESCRIPTION("CX23415/CX23416 ALSA Interface");
+MODULE_LICENSE("GPL");
+
+MODULE_VERSION(IVTV_VERSION);
+
+static inline
+struct snd_ivtv_card *to_snd_ivtv_card(struct v4l2_device *v4l2_dev)
+{
+	return to_ivtv(v4l2_dev)->alsa;
+}
+
+static void snd_ivtv_card_free(struct snd_ivtv_card *itvsc)
+{
+	if (itvsc == NULL)
+		return;
+
+	if (itvsc->v4l2_dev != NULL)
+		to_ivtv(itvsc->v4l2_dev)->alsa = NULL;
+
+	/* FIXME - take any other stopping actions needed */
+
+	kfree(itvsc);
+}
+
+static void snd_ivtv_card_private_free(struct snd_card *sc)
+{
+	if (sc == NULL)
+		return;
+	snd_ivtv_card_free(sc->private_data);
+	sc->private_data = NULL;
+	sc->private_free = NULL;
+}
+
+static int snd_ivtv_card_create(struct v4l2_device *v4l2_dev,
+				       struct snd_card *sc,
+				       struct snd_ivtv_card **itvsc)
+{
+	*itvsc = kzalloc(sizeof(struct snd_ivtv_card), GFP_KERNEL);
+	if (*itvsc == NULL)
+		return -ENOMEM;
+
+	(*itvsc)->v4l2_dev = v4l2_dev;
+	(*itvsc)->sc = sc;
+
+	sc->private_data = *itvsc;
+	sc->private_free = snd_ivtv_card_private_free;
+
+	return 0;
+}
+
+static int snd_ivtv_card_set_names(struct snd_ivtv_card *itvsc)
+{
+	struct ivtv *itv = to_ivtv(itvsc->v4l2_dev);
+	struct snd_card *sc = itvsc->sc;
+
+	/* sc->driver is used by alsa-lib's configurator: simple, unique */
+	strscpy(sc->driver, "CX2341[56]", sizeof(sc->driver));
+
+	/* sc->shortname is a symlink in /proc/asound: IVTV-M -> cardN */
+	snprintf(sc->shortname,  sizeof(sc->shortname), "IVTV-%d",
+		 itv->instance);
+
+	/* sc->longname is read from /proc/asound/cards */
+	snprintf(sc->longname, sizeof(sc->longname),
+		 "CX2341[56] #%d %s TV/FM Radio/Line-In Capture",
+		 itv->instance, itv->card_name);
+
+	return 0;
+}
+
+static int snd_ivtv_init(struct v4l2_device *v4l2_dev)
+{
+	struct ivtv *itv = to_ivtv(v4l2_dev);
+	struct snd_card *sc = NULL;
+	struct snd_ivtv_card *itvsc;
+	int ret, idx;
+
+	/* 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 itv->instance */
+
+	/* (2) Create a card instance */
+	/* use first available id if not specified otherwise*/
+	idx = index[itv->instance] == -1 ? SNDRV_DEFAULT_IDX1 : index[itv->instance];
+	ret = snd_card_new(&itv->pdev->dev,
+			   idx,
+			   SNDRV_DEFAULT_STR1, /* xid from end of shortname*/
+			   THIS_MODULE, 0, &sc);
+	if (ret) {
+		IVTV_ALSA_ERR("%s: snd_card_new() failed with err %d\n",
+			      __func__, ret);
+		goto err_exit;
+	}
+
+	/* (3) Create a main component */
+	ret = snd_ivtv_card_create(v4l2_dev, sc, &itvsc);
+	if (ret) {
+		IVTV_ALSA_ERR("%s: snd_ivtv_card_create() failed with err %d\n",
+			      __func__, ret);
+		goto err_exit_free;
+	}
+
+	/* (4) Set the driver ID and name strings */
+	snd_ivtv_card_set_names(itvsc);
+
+	/* (5) Create other components: PCM, & proc files */
+	ret = snd_ivtv_pcm_create(itvsc);
+	if (ret) {
+		IVTV_ALSA_ERR("%s: snd_ivtv_pcm_create() failed with err %d\n",
+			      __func__, 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 */
+	itv->alsa = itvsc;
+
+	/* (6) Register the card instance */
+	ret = snd_card_register(sc);
+	if (ret) {
+		itv->alsa = NULL;
+		IVTV_ALSA_ERR("%s: snd_card_register() failed with err %d\n",
+			      __func__, ret);
+		goto err_exit_free;
+	}
+
+	IVTV_ALSA_INFO("%s: Instance %d registered as ALSA card %d\n",
+			 __func__, itv->instance, sc->number);
+
+	return 0;
+
+err_exit_free:
+	if (sc != NULL)
+		snd_card_free(sc);
+	kfree(itvsc);
+err_exit:
+	return ret;
+}
+
+static int ivtv_alsa_load(struct ivtv *itv)
+{
+	struct v4l2_device *v4l2_dev = &itv->v4l2_dev;
+	struct ivtv_stream *s;
+
+	if (v4l2_dev == NULL) {
+		pr_err("ivtv-alsa: %s: struct v4l2_device * is NULL\n",
+		       __func__);
+		return 0;
+	}
+
+	itv = to_ivtv(v4l2_dev);
+	if (itv == NULL) {
+		pr_err("ivtv-alsa itv is NULL\n");
+		return 0;
+	}
+
+	s = &itv->streams[IVTV_ENC_STREAM_TYPE_PCM];
+	if (s->vdev.v4l2_dev == NULL) {
+		IVTV_DEBUG_ALSA_INFO("PCM stream for card is disabled - skipping\n");
+		return 0;
+	}
+
+	if (itv->alsa != NULL) {
+		IVTV_ALSA_ERR("%s: struct snd_ivtv_card * already exists\n",
+			      __func__);
+		return 0;
+	}
+
+	if (snd_ivtv_init(v4l2_dev)) {
+		IVTV_ALSA_ERR("%s: failed to create struct snd_ivtv_card\n",
+			      __func__);
+	} else {
+		IVTV_DEBUG_ALSA_INFO("created ivtv ALSA interface instance\n");
+	}
+	return 0;
+}
+
+static int __init ivtv_alsa_init(void)
+{
+	pr_info("ivtv-alsa: module loading...\n");
+	ivtv_ext_init = &ivtv_alsa_load;
+	return 0;
+}
+
+static void __exit snd_ivtv_exit(struct snd_ivtv_card *itvsc)
+{
+	struct ivtv *itv = to_ivtv(itvsc->v4l2_dev);
+
+	/* FIXME - pointer checks & shutdown itvsc */
+
+	snd_card_free(itvsc->sc);
+	itv->alsa = NULL;
+}
+
+static int __exit ivtv_alsa_exit_callback(struct device *dev, void *data)
+{
+	struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
+	struct snd_ivtv_card *itvsc;
+
+	if (v4l2_dev == NULL) {
+		pr_err("ivtv-alsa: %s: struct v4l2_device * is NULL\n",
+		       __func__);
+		return 0;
+	}
+
+	itvsc = to_snd_ivtv_card(v4l2_dev);
+	if (itvsc == NULL) {
+		IVTV_ALSA_WARN("%s: struct snd_ivtv_card * is NULL\n",
+			       __func__);
+		return 0;
+	}
+
+	snd_ivtv_exit(itvsc);
+	return 0;
+}
+
+static void __exit ivtv_alsa_exit(void)
+{
+	struct device_driver *drv;
+	int ret;
+
+	pr_info("ivtv-alsa: module unloading...\n");
+
+	drv = driver_find("ivtv", &pci_bus_type);
+	ret = driver_for_each_device(drv, NULL, NULL, ivtv_alsa_exit_callback);
+	(void)ret;	/* suppress compiler warning */
+
+	ivtv_ext_init = NULL;
+	pr_info("ivtv-alsa: module unload complete\n");
+}
+
+module_init(ivtv_alsa_init);
+module_exit(ivtv_alsa_exit);