[media] rename most media/video usb drivers to media/usb

Rename all USB drivers with their own directory under
drivers/media/video into drivers/media/usb and update the
building system.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 751 insertions, 0 deletions

diff --git a/drivers/media/usb/em28xx/em28xx-audio.c b/drivers/media/usb/em28xx/em28xx-audio.c
new file mode 100644
index 000000000000..2fdb66ee44ab
--- /dev/null
+++ b/drivers/media/usb/em28xx/em28xx-audio.c
@@ -0,0 +1,751 @@
+/*
+ *  Empiatech em28x1 audio extension
+ *
+ *  Copyright (C) 2006 Markus Rechberger <mrechberger@gmail.com>
+ *
+ *  Copyright (C) 2007-2011 Mauro Carvalho Chehab <mchehab@redhat.com>
+ *      - Port to work with the in-kernel driver
+ *      - Cleanups, fixes, alsa-controls, etc.
+ *
+ *  This driver is based on my previous au600 usb pstn audio driver
+ *  and inherits all the copyrights
+ *
+ *  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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/usb.h>
+#include <linux/init.h>
+#include <linux/sound.h>
+#include <linux/spinlock.h>
+#include <linux/soundcard.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/proc_fs.h>
+#include <linux/module.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/info.h>
+#include <sound/initval.h>
+#include <sound/control.h>
+#include <sound/tlv.h>
+#include <sound/ac97_codec.h>
+#include <media/v4l2-common.h>
+#include "em28xx.h"
+
+static int debug;
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "activates debug info");
+
+#define dprintk(fmt, arg...) do {                                       \
+            if (debug)                                                  \
+                printk(KERN_INFO "em28xx-audio %s: " fmt,               \
+                                  __func__, ##arg);             \
+        } while (0)
+
+static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
+
+static int em28xx_deinit_isoc_audio(struct em28xx *dev)
+{
+        int i;
+
+        dprintk("Stopping isoc\n");
+        for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
+                if (!irqs_disabled())
+                        usb_kill_urb(dev->adev.urb[i]);
+                else
+                        usb_unlink_urb(dev->adev.urb[i]);
+
+                usb_free_urb(dev->adev.urb[i]);
+                dev->adev.urb[i] = NULL;
+
+                kfree(dev->adev.transfer_buffer[i]);
+                dev->adev.transfer_buffer[i] = NULL;
+        }
+
+        return 0;
+}
+
+static void em28xx_audio_isocirq(struct urb *urb)
+{
+        struct em28xx            *dev = urb->context;
+        int                      i;
+        unsigned int             oldptr;
+        int                      period_elapsed = 0;
+        int                      status;
+        unsigned char            *cp;
+        unsigned int             stride;
+        struct snd_pcm_substream *substream;
+        struct snd_pcm_runtime   *runtime;
+
+        switch (urb->status) {
+        case 0:             /* success */
+        case -ETIMEDOUT:    /* NAK */
+                break;
+        case -ECONNRESET:   /* kill */
+        case -ENOENT:
+        case -ESHUTDOWN:
+                return;
+        default:            /* error */
+                dprintk("urb completition error %d.\n", urb->status);
+                break;
+        }
+
+        if (atomic_read(&dev->stream_started) == 0)
+                return;
+
+        if (dev->adev.capture_pcm_substream) {
+                substream = dev->adev.capture_pcm_substream;
+                runtime = substream->runtime;
+                stride = runtime->frame_bits >> 3;
+
+                for (i = 0; i < urb->number_of_packets; i++) {
+                        int length =
+                            urb->iso_frame_desc[i].actual_length / stride;
+                        cp = (unsigned char *)urb->transfer_buffer +
+                            urb->iso_frame_desc[i].offset;
+
+                        if (!length)
+                                continue;
+
+                        oldptr = dev->adev.hwptr_done_capture;
+                        if (oldptr + length >= runtime->buffer_size) {
+                                unsigned int cnt =
+                                    runtime->buffer_size - oldptr;
+                                memcpy(runtime->dma_area + oldptr * stride, cp,
+                                       cnt * stride);
+                                memcpy(runtime->dma_area, cp + cnt * stride,
+                                       length * stride - cnt * stride);
+                        } else {
+                                memcpy(runtime->dma_area + oldptr * stride, cp,
+                                       length * stride);
+                        }
+
+                        snd_pcm_stream_lock(substream);
+
+                        dev->adev.hwptr_done_capture += length;
+                        if (dev->adev.hwptr_done_capture >=
+                            runtime->buffer_size)
+                                dev->adev.hwptr_done_capture -=
+                                    runtime->buffer_size;
+
+                        dev->adev.capture_transfer_done += length;
+                        if (dev->adev.capture_transfer_done >=
+                            runtime->period_size) {
+                                dev->adev.capture_transfer_done -=
+                                    runtime->period_size;
+                                period_elapsed = 1;
+                        }
+
+                        snd_pcm_stream_unlock(substream);
+                }
+                if (period_elapsed)
+                        snd_pcm_period_elapsed(substream);
+        }
+        urb->status = 0;
+
+        status = usb_submit_urb(urb, GFP_ATOMIC);
+        if (status < 0) {
+                em28xx_errdev("resubmit of audio urb failed (error=%i)\n",
+                              status);
+        }
+        return;
+}
+
+static int em28xx_init_audio_isoc(struct em28xx *dev)
+{
+        int       i, errCode;
+        const int sb_size = EM28XX_NUM_AUDIO_PACKETS *
+                            EM28XX_AUDIO_MAX_PACKET_SIZE;
+
+        dprintk("Starting isoc transfers\n");
+
+        for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
+                struct urb *urb;
+                int j, k;
+
+                dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
+                if (!dev->adev.transfer_buffer[i])
+                        return -ENOMEM;
+
+                memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
+                urb = usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
+                if (!urb) {
+                        em28xx_errdev("usb_alloc_urb failed!\n");
+                        for (j = 0; j < i; j++) {
+                                usb_free_urb(dev->adev.urb[j]);
+                                kfree(dev->adev.transfer_buffer[j]);
+                        }
+                        return -ENOMEM;
+                }
+
+                urb->dev = dev->udev;
+                urb->context = dev;
+                urb->pipe = usb_rcvisocpipe(dev->udev, EM28XX_EP_AUDIO);
+                urb->transfer_flags = URB_ISO_ASAP;
+                urb->transfer_buffer = dev->adev.transfer_buffer[i];
+                urb->interval = 1;
+                urb->complete = em28xx_audio_isocirq;
+                urb->number_of_packets = EM28XX_NUM_AUDIO_PACKETS;
+                urb->transfer_buffer_length = sb_size;
+
+                for (j = k = 0; j < EM28XX_NUM_AUDIO_PACKETS;
+                             j++, k += EM28XX_AUDIO_MAX_PACKET_SIZE) {
+                        urb->iso_frame_desc[j].offset = k;
+                        urb->iso_frame_desc[j].length =
+                            EM28XX_AUDIO_MAX_PACKET_SIZE;
+                }
+                dev->adev.urb[i] = urb;
+        }
+
+        for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
+                errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
+                if (errCode) {
+                        em28xx_errdev("submit of audio urb failed\n");
+                        em28xx_deinit_isoc_audio(dev);
+                        atomic_set(&dev->stream_started, 0);
+                        return errCode;
+                }
+
+        }
+
+        return 0;
+}
+
+static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
+                                        size_t size)
+{
+        struct snd_pcm_runtime *runtime = subs->runtime;
+
+        dprintk("Allocating vbuffer\n");
+        if (runtime->dma_area) {
+                if (runtime->dma_bytes > size)
+                        return 0;
+
+                vfree(runtime->dma_area);
+        }
+        runtime->dma_area = vmalloc(size);
+        if (!runtime->dma_area)
+                return -ENOMEM;
+
+        runtime->dma_bytes = size;
+
+        return 0;
+}
+
+static struct snd_pcm_hardware snd_em28xx_hw_capture = {
+        .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
+                SNDRV_PCM_INFO_MMAP           |
+                SNDRV_PCM_INFO_INTERLEAVED    |
+                SNDRV_PCM_INFO_BATCH          |
+                SNDRV_PCM_INFO_MMAP_VALID,
+
+        .formats = SNDRV_PCM_FMTBIT_S16_LE,
+
+        .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
+
+        .rate_min = 48000,
+        .rate_max = 48000,
+        .channels_min = 2,
+        .channels_max = 2,
+        .buffer_bytes_max = 62720 * 8,  /* just about the value in usbaudio.c */
+        .period_bytes_min = 64,         /* 12544/2, */
+        .period_bytes_max = 12544,
+        .periods_min = 2,
+        .periods_max = 98,              /* 12544, */
+};
+
+static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
+{
+        struct em28xx *dev = snd_pcm_substream_chip(substream);
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        int ret = 0;
+
+        dprintk("opening device and trying to acquire exclusive lock\n");
+
+        if (!dev) {
+                em28xx_err("BUG: em28xx can't find device struct."
+                                " Can't proceed with open\n");
+                return -ENODEV;
+        }
+
+        runtime->hw = snd_em28xx_hw_capture;
+        if ((dev->alt == 0 || dev->audio_ifnum) && dev->adev.users == 0) {
+                if (dev->audio_ifnum)
+                        dev->alt = 1;
+                else
+                        dev->alt = 7;
+
+                dprintk("changing alternate number on interface %d to %d\n",
+                        dev->audio_ifnum, dev->alt);
+                usb_set_interface(dev->udev, dev->audio_ifnum, dev->alt);
+
+                /* Sets volume, mute, etc */
+                dev->mute = 0;
+                mutex_lock(&dev->lock);
+                ret = em28xx_audio_analog_set(dev);
+                if (ret < 0)
+                        goto err;
+
+                dev->adev.users++;
+                mutex_unlock(&dev->lock);
+        }
+
+        snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
+        dev->adev.capture_pcm_substream = substream;
+
+        return 0;
+err:
+        mutex_unlock(&dev->lock);
+
+        em28xx_err("Error while configuring em28xx mixer\n");
+        return ret;
+}
+
+static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
+{
+        struct em28xx *dev = snd_pcm_substream_chip(substream);
+
+        dprintk("closing device\n");
+
+        dev->mute = 1;
+        mutex_lock(&dev->lock);
+        dev->adev.users--;
+        if (atomic_read(&dev->stream_started) > 0) {
+                atomic_set(&dev->stream_started, 0);
+                schedule_work(&dev->wq_trigger);
+        }
+
+        em28xx_audio_analog_set(dev);
+        if (substream->runtime->dma_area) {
+                dprintk("freeing\n");
+                vfree(substream->runtime->dma_area);
+                substream->runtime->dma_area = NULL;
+        }
+        mutex_unlock(&dev->lock);
+
+        return 0;
+}
+
+static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
+                                        struct snd_pcm_hw_params *hw_params)
+{
+        int ret;
+
+        dprintk("Setting capture parameters\n");
+
+        ret = snd_pcm_alloc_vmalloc_buffer(substream,
+                                params_buffer_bytes(hw_params));
+        if (ret < 0)
+                return ret;
+#if 0
+        /* TODO: set up em28xx audio chip to deliver the correct audio format,
+           current default is 48000hz multiplexed => 96000hz mono
+           which shouldn't matter since analogue TV only supports mono */
+        unsigned int channels, rate, format;
+
+        format = params_format(hw_params);
+        rate = params_rate(hw_params);
+        channels = params_channels(hw_params);
+#endif
+
+        return 0;
+}
+
+static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
+{
+        struct em28xx *dev = snd_pcm_substream_chip(substream);
+
+        dprintk("Stop capture, if needed\n");
+
+        if (atomic_read(&dev->stream_started) > 0) {
+                atomic_set(&dev->stream_started, 0);
+                schedule_work(&dev->wq_trigger);
+        }
+
+        return 0;
+}
+
+static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
+{
+        struct em28xx *dev = snd_pcm_substream_chip(substream);
+
+        dev->adev.hwptr_done_capture = 0;
+        dev->adev.capture_transfer_done = 0;
+
+        return 0;
+}
+
+static void audio_trigger(struct work_struct *work)
+{
+        struct em28xx *dev = container_of(work, struct em28xx, wq_trigger);
+
+        if (atomic_read(&dev->stream_started)) {
+                dprintk("starting capture");
+                em28xx_init_audio_isoc(dev);
+        } else {
+                dprintk("stopping capture");
+                em28xx_deinit_isoc_audio(dev);
+        }
+}
+
+static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
+                                      int cmd)
+{
+        struct em28xx *dev = snd_pcm_substream_chip(substream);
+        int retval = 0;
+
+        switch (cmd) {
+        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
+        case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
+        case SNDRV_PCM_TRIGGER_START:
+                atomic_set(&dev->stream_started, 1);
+                break;
+        case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
+        case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
+        case SNDRV_PCM_TRIGGER_STOP:
+                atomic_set(&dev->stream_started, 0);
+                break;
+        default:
+                retval = -EINVAL;
+        }
+        schedule_work(&dev->wq_trigger);
+        return retval;
+}
+
+static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
+                                                    *substream)
+{
+        unsigned long flags;
+        struct em28xx *dev;
+        snd_pcm_uframes_t hwptr_done;
+
+        dev = snd_pcm_substream_chip(substream);
+        spin_lock_irqsave(&dev->adev.slock, flags);
+        hwptr_done = dev->adev.hwptr_done_capture;
+        spin_unlock_irqrestore(&dev->adev.slock, flags);
+
+        return hwptr_done;
+}
+
+static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
+                                             unsigned long offset)
+{
+        void *pageptr = subs->runtime->dma_area + offset;
+
+        return vmalloc_to_page(pageptr);
+}
+
+/*
+ * AC97 volume control support
+ */
+static int em28xx_vol_info(struct snd_kcontrol *kcontrol,
+                                struct snd_ctl_elem_info *info)
+{
+        info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+        info->count = 2;
+        info->value.integer.min = 0;
+        info->value.integer.max = 0x1f;
+
+        return 0;
+}
+
+static int em28xx_vol_put(struct snd_kcontrol *kcontrol,
+                               struct snd_ctl_elem_value *value)
+{
+        struct em28xx *dev = snd_kcontrol_chip(kcontrol);
+        u16 val = (0x1f - (value->value.integer.value[0] & 0x1f)) |
+                  (0x1f - (value->value.integer.value[1] & 0x1f)) << 8;
+        int rc;
+
+        mutex_lock(&dev->lock);
+        rc = em28xx_read_ac97(dev, kcontrol->private_value);
+        if (rc < 0)
+                goto err;
+
+        val |= rc & 0x8000;     /* Preserve the mute flag */
+
+        rc = em28xx_write_ac97(dev, kcontrol->private_value, val);
+        if (rc < 0)
+                goto err;
+
+        dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
+                (val & 0x8000) ? "muted " : "",
+                0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
+                val, (int)kcontrol->private_value);
+
+err:
+        mutex_unlock(&dev->lock);
+        return rc;
+}
+
+static int em28xx_vol_get(struct snd_kcontrol *kcontrol,
+                               struct snd_ctl_elem_value *value)
+{
+        struct em28xx *dev = snd_kcontrol_chip(kcontrol);
+        int val;
+
+        mutex_lock(&dev->lock);
+        val = em28xx_read_ac97(dev, kcontrol->private_value);
+        mutex_unlock(&dev->lock);
+        if (val < 0)
+                return val;
+
+        dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
+                (val & 0x8000) ? "muted " : "",
+                0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
+                val, (int)kcontrol->private_value);
+
+        value->value.integer.value[0] = 0x1f - (val & 0x1f);
+        value->value.integer.value[1] = 0x1f - ((val << 8) & 0x1f);
+
+        return 0;
+}
+
+static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol,
+                               struct snd_ctl_elem_value *value)
+{
+        struct em28xx *dev = snd_kcontrol_chip(kcontrol);
+        u16 val = value->value.integer.value[0];
+        int rc;
+
+        mutex_lock(&dev->lock);
+        rc = em28xx_read_ac97(dev, kcontrol->private_value);
+        if (rc < 0)
+                goto err;
+
+        if (val)
+                rc &= 0x1f1f;
+        else
+                rc |= 0x8000;
+
+        rc = em28xx_write_ac97(dev, kcontrol->private_value, rc);
+        if (rc < 0)
+                goto err;
+
+        dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
+                (val & 0x8000) ? "muted " : "",
+                0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
+                val, (int)kcontrol->private_value);
+
+err:
+        mutex_unlock(&dev->lock);
+        return rc;
+}
+
+static int em28xx_vol_get_mute(struct snd_kcontrol *kcontrol,
+                               struct snd_ctl_elem_value *value)
+{
+        struct em28xx *dev = snd_kcontrol_chip(kcontrol);
+        int val;
+
+        mutex_lock(&dev->lock);
+        val = em28xx_read_ac97(dev, kcontrol->private_value);
+        mutex_unlock(&dev->lock);
+        if (val < 0)
+                return val;
+
+        if (val & 0x8000)
+                value->value.integer.value[0] = 0;
+        else
+                value->value.integer.value[0] = 1;
+
+        dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
+                (val & 0x8000) ? "muted " : "",
+                0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
+                val, (int)kcontrol->private_value);
+
+        return 0;
+}
+
+static const DECLARE_TLV_DB_SCALE(em28xx_db_scale, -3450, 150, 0);
+
+static int em28xx_cvol_new(struct snd_card *card, struct em28xx *dev,
+                           char *name, int id)
+{
+        int err;
+        char ctl_name[44];
+        struct snd_kcontrol *kctl;
+        struct snd_kcontrol_new tmp;
+
+        memset (&tmp, 0, sizeof(tmp));
+        tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+        tmp.private_value = id,
+        tmp.name  = ctl_name,
+
+        /* Add Mute Control */
+        sprintf(ctl_name, "%s Switch", name);
+        tmp.get  = em28xx_vol_get_mute;
+        tmp.put  = em28xx_vol_put_mute;
+        tmp.info = snd_ctl_boolean_mono_info;
+        kctl = snd_ctl_new1(&tmp, dev);
+        err = snd_ctl_add(card, kctl);
+        if (err < 0)
+                return err;
+        dprintk("Added control %s for ac97 volume control 0x%04x\n",
+                ctl_name, id);
+
+        memset (&tmp, 0, sizeof(tmp));
+        tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+        tmp.private_value = id,
+        tmp.name  = ctl_name,
+
+        /* Add Volume Control */
+        sprintf(ctl_name, "%s Volume", name);
+        tmp.get   = em28xx_vol_get;
+        tmp.put   = em28xx_vol_put;
+        tmp.info  = em28xx_vol_info;
+        tmp.tlv.p = em28xx_db_scale,
+        kctl = snd_ctl_new1(&tmp, dev);
+        err = snd_ctl_add(card, kctl);
+        if (err < 0)
+                return err;
+        dprintk("Added control %s for ac97 volume control 0x%04x\n",
+                ctl_name, id);
+
+        return 0;
+}
+
+/*
+ * register/unregister code and data
+ */
+static struct snd_pcm_ops snd_em28xx_pcm_capture = {
+        .open      = snd_em28xx_capture_open,
+        .close     = snd_em28xx_pcm_close,
+        .ioctl     = snd_pcm_lib_ioctl,
+        .hw_params = snd_em28xx_hw_capture_params,
+        .hw_free   = snd_em28xx_hw_capture_free,
+        .prepare   = snd_em28xx_prepare,
+        .trigger   = snd_em28xx_capture_trigger,
+        .pointer   = snd_em28xx_capture_pointer,
+        .page      = snd_pcm_get_vmalloc_page,
+};
+
+static int em28xx_audio_init(struct em28xx *dev)
+{
+        struct em28xx_audio *adev = &dev->adev;
+        struct snd_pcm      *pcm;
+        struct snd_card     *card;
+        static int          devnr;
+        int                 err;
+
+        if (!dev->has_alsa_audio || dev->audio_ifnum < 0) {
+                /* This device does not support the extension (in this case
+                   the device is expecting the snd-usb-audio module or
+                   doesn't have analog audio support at all) */
+                return 0;
+        }
+
+        printk(KERN_INFO "em28xx-audio.c: probing for em28xx Audio Vendor Class\n");
+        printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
+                         "Rechberger\n");
+        printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2007-2011 Mauro Carvalho Chehab\n");
+
+        err = snd_card_create(index[devnr], "Em28xx Audio", THIS_MODULE, 0,
+                              &card);
+        if (err < 0)
+                return err;
+
+        spin_lock_init(&adev->slock);
+        err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
+        if (err < 0) {
+                snd_card_free(card);
+                return err;
+        }
+
+        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
+        pcm->info_flags = 0;
+        pcm->private_data = dev;
+        strcpy(pcm->name, "Empia 28xx Capture");
+
+        snd_card_set_dev(card, &dev->udev->dev);
+        strcpy(card->driver, "Em28xx-Audio");
+        strcpy(card->shortname, "Em28xx Audio");
+        strcpy(card->longname, "Empia Em28xx Audio");
+
+        INIT_WORK(&dev->wq_trigger, audio_trigger);
+
+        if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
+                em28xx_cvol_new(card, dev, "Video", AC97_VIDEO);
+                em28xx_cvol_new(card, dev, "Line In", AC97_LINE);
+                em28xx_cvol_new(card, dev, "Phone", AC97_PHONE);
+                em28xx_cvol_new(card, dev, "Microphone", AC97_MIC);
+                em28xx_cvol_new(card, dev, "CD", AC97_CD);
+                em28xx_cvol_new(card, dev, "AUX", AC97_AUX);
+                em28xx_cvol_new(card, dev, "PCM", AC97_PCM);
+
+                em28xx_cvol_new(card, dev, "Master", AC97_MASTER);
+                em28xx_cvol_new(card, dev, "Line", AC97_HEADPHONE);
+                em28xx_cvol_new(card, dev, "Mono", AC97_MASTER_MONO);
+                em28xx_cvol_new(card, dev, "LFE", AC97_CENTER_LFE_MASTER);
+                em28xx_cvol_new(card, dev, "Surround", AC97_SURROUND_MASTER);
+        }
+
+        err = snd_card_register(card);
+        if (err < 0) {
+                snd_card_free(card);
+                return err;
+        }
+        adev->sndcard = card;
+        adev->udev = dev->udev;
+
+        return 0;
+}
+
+static int em28xx_audio_fini(struct em28xx *dev)
+{
+        if (dev == NULL)
+                return 0;
+
+        if (dev->has_alsa_audio != 1) {
+                /* This device does not support the extension (in this case
+                   the device is expecting the snd-usb-audio module or
+                   doesn't have analog audio support at all) */
+                return 0;
+        }
+
+        if (dev->adev.sndcard) {
+                snd_card_free(dev->adev.sndcard);
+                dev->adev.sndcard = NULL;
+        }
+
+        return 0;
+}
+
+static struct em28xx_ops audio_ops = {
+        .id   = EM28XX_AUDIO,
+        .name = "Em28xx Audio Extension",
+        .init = em28xx_audio_init,
+        .fini = em28xx_audio_fini,
+};
+
+static int __init em28xx_alsa_register(void)
+{
+        return em28xx_register_extension(&audio_ops);
+}
+
+static void __exit em28xx_alsa_unregister(void)
+{
+        em28xx_unregister_extension(&audio_ops);
+}
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
+MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
+MODULE_DESCRIPTION("Em28xx Audio driver");
+
+module_init(em28xx_alsa_register);
+module_exit(em28xx_alsa_unregister);