1 files changed, 303 insertions, 0 deletions

diff --git a/drivers/media/video/cx18/cx18-alsa.c b/drivers/media/video/cx18/cx18-alsa.c
new file mode 100644
index 000000000000..dde2b0482f34
--- /dev/null
+++ b/drivers/media/video/cx18/cx18-alsa.c
@@ -0,0 +1,303 @@
+/*
+ *  ALSA interface to cx18 PCM capture streams
+ *
+ *  Copyright (C) 2009  Andy Walls <awalls@radix.net>
+ *
+ *  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-alsa-mixer.h"
+#include "cx18-alsa-pcm.h"
+
+int cx18_alsa_debug;
+
+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 __init 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 __init 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);
+}
+
+static int __init snd_cx18_init(struct v4l2_device *v4l2_dev)
+{
+        struct cx18 *cx = to_cx18(v4l2_dev);
+        struct snd_card *sc;
+        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);
+
+        /* (5) Create other components: mixer, PCM, & proc files */
+        ret = snd_cx18_mixer_create(cxsc);
+        if (ret) {
+                CX18_ALSA_WARN("%s: snd_cx18_mixer_create() failed with err %d:"
+                               "proceeding anyway\n", __func__, ret);
+        }
+
+        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:
+        snd_card_free(sc);
+err_exit:
+        return ret;
+}
+
+static int __init cx18_alsa_init_callback(struct device *dev, void *data)
+{
+        struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
+        int *count = data;
+        struct cx18 *cx;
+        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);
+        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 "
+                                     "%d\n", __func__, *count);
+                (*count)++;
+        }
+        return 0;
+}
+
+static int __init cx18_alsa_init(void)
+{
+        struct device_driver *drv;
+        int count = 0;
+        int ret;
+
+        printk(KERN_INFO "cx18-alsa: module loading...\n");
+
+        drv = driver_find("cx18", &pci_bus_type);
+        ret = driver_for_each_device(drv, NULL, &count,
+                                     cx18_alsa_init_callback);
+        put_driver(drv);
+
+        if (count == 0) {
+                printk(KERN_ERR "cx18-alsa: no cx18 cards found with a PCM "
+                       "capture stream allocated\n");
+                ret = -ENODEV;
+        } else {
+                printk(KERN_INFO "cx18-alsa: ALSA interface(s) created for %d "
+                       "cx18 card(s)\n", count);
+                ret = 0;
+        }
+
+        printk(KERN_INFO "cx18-alsa: module load complete\n");
+        return ret;
+}
+
+static void snd_cx18_exit(struct snd_cx18_card *cxsc)
+{
+        struct cx18 *cx = to_cx18(cxsc->4l2_dev);
+
+        /* FIXME - pointer checks & shutdown cxsc */
+
+        snd_card_free(cxsc->sc);
+        cx->alsa = NULL;
+}
+
+static int cx18_alsa_exit_callback(struct device *dev, void *data)
+{
+        struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
+        struct snd_cx18_card *cxsc;
+        struct cx18 *cx;
+
+        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 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);
+
+        printk(KERN_INFO "cx18-alsa: module unload complete\n");
+}
+
+module_init(cx18_alsa_init);
+module_exit(cx18_alsa_exit);