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path: root/drivers/media/pci/cx18/cx18-alsa-main.c
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Diffstat (limited to 'drivers/media/pci/cx18/cx18-alsa-main.c')
-rw-r--r--drivers/media/pci/cx18/cx18-alsa-main.c295
1 files changed, 295 insertions, 0 deletions
diff --git a/drivers/media/pci/cx18/cx18-alsa-main.c b/drivers/media/pci/cx18/cx18-alsa-main.c
new file mode 100644
index 000000000000..6d2a98246b6d
--- /dev/null
+++ b/drivers/media/pci/cx18/cx18-alsa-main.c
@@ -0,0 +1,295 @@
+/*
+ * ALSA interface to cx18 PCM capture streams
+ *
+ * Copyright (C) 2009 Andy Walls <awalls@md.metrocast.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/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 "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);
+ kfree(cxsc);
+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);
+ (void)ret; /* suppress compiler warning */
+
+ 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 v1.2.3 (git 2.0.4) at 2024-11-16 10:31:23 +0000