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Diffstat (limited to 'drivers/media/video/cx18/cx18-alsa-main.c')
-rw-r--r--drivers/media/video/cx18/cx18-alsa-main.c293
1 files changed, 293 insertions, 0 deletions
diff --git a/drivers/media/video/cx18/cx18-alsa-main.c b/drivers/media/video/cx18/cx18-alsa-main.c
new file mode 100644
index 000000000000..eb41d7ec65b9
--- /dev/null
+++ b/drivers/media/video/cx18/cx18-alsa-main.c
@@ -0,0 +1,293 @@
+/*
+ *  ALSA interface to cx18 PCM capture streams
+ *
+ *  Copyright (C) 2009  Andy Walls <awalls@radix.net>
+ *  Copyright (C) 2009  Devin Heitmueller <dheitmueller@kernellabs.com>
+ *
+ *  Portions of this work were sponsored by ONELAN Limited.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ *  02111-1307  USA
+ */
+
+#include <linux/init.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 "cx18-driver.h"
+#include "cx18-version.h"
+#include "cx18-alsa.h"
+#include "cx18-alsa-mixer.h"
+#include "cx18-alsa-pcm.h"
+
+int cx18_alsa_debug;
+
+#define CX18_DEBUG_ALSA_INFO(fmt, arg...) \
+	do { \
+		if (cx18_alsa_debug & 2) \
+			printk(KERN_INFO "%s: " fmt, "cx18-alsa", ## arg); \
+	} while (0);
+
+module_param_named(debug, cx18_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_AUTHOR("Andy Walls");
+MODULE_DESCRIPTION("CX23418 ALSA Interface");
+MODULE_SUPPORTED_DEVICE("CX23418 MPEG2 encoder");
+MODULE_LICENSE("GPL");
+
+MODULE_VERSION(CX18_VERSION);
+
+static inline
+struct snd_cx18_card *to_snd_cx18_card(struct v4l2_device *v4l2_dev)
+{
+	return to_cx18(v4l2_dev)->alsa;
+}
+
+static inline
+struct snd_cx18_card *p_to_snd_cx18_card(struct v4l2_device **v4l2_dev)
+{
+	return container_of(v4l2_dev, struct snd_cx18_card, v4l2_dev);
+}
+
+static void snd_cx18_card_free(struct snd_cx18_card *cxsc)
+{
+	if (cxsc == NULL)
+		return;
+
+	if (cxsc->v4l2_dev != NULL)
+		to_cx18(cxsc->v4l2_dev)->alsa = NULL;
+
+	/* FIXME - take any other stopping actions needed */
+
+	kfree(cxsc);
+}
+
+static void snd_cx18_card_private_free(struct snd_card *sc)
+{
+	if (sc == NULL)
+		return;
+	snd_cx18_card_free(sc->private_data);
+	sc->private_data = NULL;
+	sc->private_free = NULL;
+}
+
+static int snd_cx18_card_create(struct v4l2_device *v4l2_dev,
+				       struct snd_card *sc,
+				       struct snd_cx18_card **cxsc)
+{
+	*cxsc = kzalloc(sizeof(struct snd_cx18_card), GFP_KERNEL);
+	if (*cxsc == NULL)
+		return -ENOMEM;
+
+	(*cxsc)->v4l2_dev = v4l2_dev;
+	(*cxsc)->sc = sc;
+
+	sc->private_data = *cxsc;
+	sc->private_free = snd_cx18_card_private_free;
+
+	return 0;
+}
+
+static int snd_cx18_card_set_names(struct snd_cx18_card *cxsc)
+{
+	struct cx18 *cx = to_cx18(cxsc->v4l2_dev);
+	struct snd_card *sc = cxsc->sc;
+
+	/* sc->driver is used by alsa-lib's configurator: simple, unique */
+	strlcpy(sc->driver, "CX23418", sizeof(sc->driver));
+
+	/* sc->shortname is a symlink in /proc/asound: CX18-M -> cardN */
+	snprintf(sc->shortname,  sizeof(sc->shortname), "CX18-%d",
+		 cx->instance);
+
+	/* sc->longname is read from /proc/asound/cards */
+	snprintf(sc->longname, sizeof(sc->longname),
+		 "CX23418 #%d %s TV/FM Radio/Line-In Capture",
+		 cx->instance, cx->card_name);
+
+	return 0;
+}
+
+static int snd_cx18_init(struct v4l2_device *v4l2_dev)
+{
+	struct cx18 *cx = to_cx18(v4l2_dev);
+	struct snd_card *sc = NULL;
+	struct snd_cx18_card *cxsc;
+	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 cx->instance */
+
+	/* (2) Create a card instance */
+	ret = snd_card_create(SNDRV_DEFAULT_IDX1, /* use first available id */
+			      SNDRV_DEFAULT_STR1, /* xid from end of shortname*/
+			      THIS_MODULE, 0, &sc);
+	if (ret) {
+		CX18_ALSA_ERR("%s: snd_card_create() failed with err %d\n",
+			      __func__, ret);
+		goto err_exit;
+	}
+
+	/* (3) Create a main component */
+	ret = snd_cx18_card_create(v4l2_dev, sc, &cxsc);
+	if (ret) {
+		CX18_ALSA_ERR("%s: snd_cx18_card_create() failed with err %d\n",
+			      __func__, ret);
+		goto err_exit_free;
+	}
+
+	/* (4) Set the driver ID and name strings */
+	snd_cx18_card_set_names(cxsc);
+
+
+	ret = snd_cx18_pcm_create(cxsc);
+	if (ret) {
+		CX18_ALSA_ERR("%s: snd_cx18_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 */
+	cx->alsa = cxsc;
+
+	/* (6) Register the card instance */
+	ret = snd_card_register(sc);
+	if (ret) {
+		cx->alsa = NULL;
+		CX18_ALSA_ERR("%s: snd_card_register() failed with err %d\n",
+			      __func__, ret);
+		goto err_exit_free;
+	}
+
+	return 0;
+
+err_exit_free:
+	if (sc != NULL)
+		snd_card_free(sc);
+err_exit:
+	return ret;
+}
+
+int cx18_alsa_load(struct cx18 *cx)
+{
+	struct v4l2_device *v4l2_dev = &cx->v4l2_dev;
+	struct cx18_stream *s;
+
+	if (v4l2_dev == NULL) {
+		printk(KERN_ERR "cx18-alsa: %s: struct v4l2_device * is NULL\n",
+		       __func__);
+		return 0;
+	}
+
+	cx = to_cx18(v4l2_dev);
+	if (cx == NULL) {
+		printk(KERN_ERR "cx18-alsa cx is NULL\n");
+		return 0;
+	}
+
+	s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM];
+	if (s->video_dev == NULL) {
+		CX18_DEBUG_ALSA_INFO("%s: PCM stream for card is disabled - "
+				     "skipping\n", __func__);
+		return 0;
+	}
+
+	if (cx->alsa != NULL) {
+		CX18_ALSA_ERR("%s: struct snd_cx18_card * already exists\n",
+			      __func__);
+		return 0;
+	}
+
+	if (snd_cx18_init(v4l2_dev)) {
+		CX18_ALSA_ERR("%s: failed to create struct snd_cx18_card\n",
+			      __func__);
+	} else {
+		CX18_DEBUG_ALSA_INFO("%s: created cx18 ALSA interface instance "
+				     "\n", __func__);
+	}
+	return 0;
+}
+
+static int __init cx18_alsa_init(void)
+{
+	printk(KERN_INFO "cx18-alsa: module loading...\n");
+	cx18_ext_init = &cx18_alsa_load;
+	return 0;
+}
+
+static void __exit snd_cx18_exit(struct snd_cx18_card *cxsc)
+{
+	struct cx18 *cx = to_cx18(cxsc->v4l2_dev);
+
+	/* FIXME - pointer checks & shutdown cxsc */
+
+	snd_card_free(cxsc->sc);
+	cx->alsa = NULL;
+}
+
+static int __exit cx18_alsa_exit_callback(struct device *dev, void *data)
+{
+	struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
+	struct snd_cx18_card *cxsc;
+
+	if (v4l2_dev == NULL) {
+		printk(KERN_ERR "cx18-alsa: %s: struct v4l2_device * is NULL\n",
+		       __func__);
+		return 0;
+	}
+
+	cxsc = to_snd_cx18_card(v4l2_dev);
+	if (cxsc == NULL) {
+		CX18_ALSA_WARN("%s: struct snd_cx18_card * is NULL\n",
+			       __func__);
+		return 0;
+	}
+
+	snd_cx18_exit(cxsc);
+	return 0;
+}
+
+static void __exit cx18_alsa_exit(void)
+{
+	struct device_driver *drv;
+	int ret;
+
+	printk(KERN_INFO "cx18-alsa: module unloading...\n");
+
+	drv = driver_find("cx18", &pci_bus_type);
+	ret = driver_for_each_device(drv, NULL, NULL, cx18_alsa_exit_callback);
+	put_driver(drv);
+
+	cx18_ext_init = NULL;
+	printk(KERN_INFO "cx18-alsa: module unload complete\n");
+}
+
+module_init(cx18_alsa_init);
+module_exit(cx18_alsa_exit);
generated by cgit-pink 1.4.1 (git 2.36.1) at 2024-09-29 15:36:50 +0000