1 files changed, 298 insertions, 0 deletions

diff --git a/drivers/media/usb/go7007/snd-go7007.c b/drivers/media/usb/go7007/snd-go7007.c
new file mode 100644
index 000000000000..d22d7d574672
--- /dev/null
+++ b/drivers/media/usb/go7007/snd-go7007.c
@@ -0,0 +1,298 @@
+/*
+ * Copyright (C) 2005-2006 Micronas USA Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License (Version 2) as
+ * published by the Free Software Foundation.
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/spinlock.h>
+#include <linux/delay.h>
+#include <linux/sched.h>
+#include <linux/vmalloc.h>
+#include <linux/time.h>
+#include <linux/mm.h>
+#include <linux/i2c.h>
+#include <linux/mutex.h>
+#include <linux/uaccess.h>
+#include <linux/slab.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/initval.h>
+
+#include "go7007-priv.h"
+
+static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
+static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
+static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
+
+module_param_array(index, int, NULL, 0444);
+module_param_array(id, charp, NULL, 0444);
+module_param_array(enable, bool, NULL, 0444);
+MODULE_PARM_DESC(index, "Index value for the go7007 audio driver");
+MODULE_PARM_DESC(id, "ID string for the go7007 audio driver");
+MODULE_PARM_DESC(enable, "Enable for the go7007 audio driver");
+
+struct go7007_snd {
+        struct snd_card *card;
+        struct snd_pcm *pcm;
+        struct snd_pcm_substream *substream;
+        spinlock_t lock;
+        int w_idx;
+        int hw_ptr;
+        int avail;
+        int capturing;
+};
+
+static struct snd_pcm_hardware go7007_snd_capture_hw = {
+        .info                   = (SNDRV_PCM_INFO_MMAP |
+                                        SNDRV_PCM_INFO_INTERLEAVED |
+                                        SNDRV_PCM_INFO_BLOCK_TRANSFER |
+                                        SNDRV_PCM_INFO_MMAP_VALID),
+        .formats                = SNDRV_PCM_FMTBIT_S16_LE,
+        .rates                  = SNDRV_PCM_RATE_48000,
+        .rate_min               = 48000,
+        .rate_max               = 48000,
+        .channels_min           = 2,
+        .channels_max           = 2,
+        .buffer_bytes_max       = (128*1024),
+        .period_bytes_min       = 4096,
+        .period_bytes_max       = (128*1024),
+        .periods_min            = 1,
+        .periods_max            = 32,
+};
+
+static void parse_audio_stream_data(struct go7007 *go, u8 *buf, int length)
+{
+        struct go7007_snd *gosnd = go->snd_context;
+        struct snd_pcm_runtime *runtime = gosnd->substream->runtime;
+        int frames = bytes_to_frames(runtime, length);
+
+        spin_lock(&gosnd->lock);
+        gosnd->hw_ptr += frames;
+        if (gosnd->hw_ptr >= runtime->buffer_size)
+                gosnd->hw_ptr -= runtime->buffer_size;
+        gosnd->avail += frames;
+        spin_unlock(&gosnd->lock);
+        if (gosnd->w_idx + length > runtime->dma_bytes) {
+                int cpy = runtime->dma_bytes - gosnd->w_idx;
+
+                memcpy(runtime->dma_area + gosnd->w_idx, buf, cpy);
+                length -= cpy;
+                buf += cpy;
+                gosnd->w_idx = 0;
+        }
+        memcpy(runtime->dma_area + gosnd->w_idx, buf, length);
+        gosnd->w_idx += length;
+        spin_lock(&gosnd->lock);
+        if (gosnd->avail < runtime->period_size) {
+                spin_unlock(&gosnd->lock);
+                return;
+        }
+        gosnd->avail -= runtime->period_size;
+        spin_unlock(&gosnd->lock);
+        if (gosnd->capturing)
+                snd_pcm_period_elapsed(gosnd->substream);
+}
+
+static int go7007_snd_hw_params(struct snd_pcm_substream *substream,
+                                struct snd_pcm_hw_params *hw_params)
+{
+        struct go7007 *go = snd_pcm_substream_chip(substream);
+        unsigned int bytes;
+
+        bytes = params_buffer_bytes(hw_params);
+        if (substream->runtime->dma_bytes > 0)
+                vfree(substream->runtime->dma_area);
+        substream->runtime->dma_bytes = 0;
+        substream->runtime->dma_area = vmalloc(bytes);
+        if (substream->runtime->dma_area == NULL)
+                return -ENOMEM;
+        substream->runtime->dma_bytes = bytes;
+        go->audio_deliver = parse_audio_stream_data;
+        return 0;
+}
+
+static int go7007_snd_hw_free(struct snd_pcm_substream *substream)
+{
+        struct go7007 *go = snd_pcm_substream_chip(substream);
+
+        go->audio_deliver = NULL;
+        if (substream->runtime->dma_bytes > 0)
+                vfree(substream->runtime->dma_area);
+        substream->runtime->dma_bytes = 0;
+        return 0;
+}
+
+static int go7007_snd_capture_open(struct snd_pcm_substream *substream)
+{
+        struct go7007 *go = snd_pcm_substream_chip(substream);
+        struct go7007_snd *gosnd = go->snd_context;
+        unsigned long flags;
+        int r;
+
+        spin_lock_irqsave(&gosnd->lock, flags);
+        if (gosnd->substream == NULL) {
+                gosnd->substream = substream;
+                substream->runtime->hw = go7007_snd_capture_hw;
+                r = 0;
+        } else
+                r = -EBUSY;
+        spin_unlock_irqrestore(&gosnd->lock, flags);
+        return r;
+}
+
+static int go7007_snd_capture_close(struct snd_pcm_substream *substream)
+{
+        struct go7007 *go = snd_pcm_substream_chip(substream);
+        struct go7007_snd *gosnd = go->snd_context;
+
+        gosnd->substream = NULL;
+        return 0;
+}
+
+static int go7007_snd_pcm_prepare(struct snd_pcm_substream *substream)
+{
+        return 0;
+}
+
+static int go7007_snd_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+        struct go7007 *go = snd_pcm_substream_chip(substream);
+        struct go7007_snd *gosnd = go->snd_context;
+
+        switch (cmd) {
+        case SNDRV_PCM_TRIGGER_START:
+                /* Just set a flag to indicate we should signal ALSA when
+                 * sound comes in */
+                gosnd->capturing = 1;
+                return 0;
+        case SNDRV_PCM_TRIGGER_STOP:
+                gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0;
+                gosnd->capturing = 0;
+                return 0;
+        default:
+                return -EINVAL;
+        }
+}
+
+static snd_pcm_uframes_t go7007_snd_pcm_pointer(struct snd_pcm_substream *substream)
+{
+        struct go7007 *go = snd_pcm_substream_chip(substream);
+        struct go7007_snd *gosnd = go->snd_context;
+
+        return gosnd->hw_ptr;
+}
+
+static struct page *go7007_snd_pcm_page(struct snd_pcm_substream *substream,
+                                        unsigned long offset)
+{
+        return vmalloc_to_page(substream->runtime->dma_area + offset);
+}
+
+static struct snd_pcm_ops go7007_snd_capture_ops = {
+        .open           = go7007_snd_capture_open,
+        .close          = go7007_snd_capture_close,
+        .ioctl          = snd_pcm_lib_ioctl,
+        .hw_params      = go7007_snd_hw_params,
+        .hw_free        = go7007_snd_hw_free,
+        .prepare        = go7007_snd_pcm_prepare,
+        .trigger        = go7007_snd_pcm_trigger,
+        .pointer        = go7007_snd_pcm_pointer,
+        .page           = go7007_snd_pcm_page,
+};
+
+static int go7007_snd_free(struct snd_device *device)
+{
+        struct go7007 *go = device->device_data;
+
+        kfree(go->snd_context);
+        go->snd_context = NULL;
+        return 0;
+}
+
+static struct snd_device_ops go7007_snd_device_ops = {
+        .dev_free       = go7007_snd_free,
+};
+
+int go7007_snd_init(struct go7007 *go)
+{
+        static int dev;
+        struct go7007_snd *gosnd;
+        int ret = 0;
+
+        if (dev >= SNDRV_CARDS)
+                return -ENODEV;
+        if (!enable[dev]) {
+                dev++;
+                return -ENOENT;
+        }
+        gosnd = kmalloc(sizeof(struct go7007_snd), GFP_KERNEL);
+        if (gosnd == NULL)
+                return -ENOMEM;
+        spin_lock_init(&gosnd->lock);
+        gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0;
+        gosnd->capturing = 0;
+        ret = snd_card_new(go->dev, index[dev], id[dev], THIS_MODULE, 0,
+                           &gosnd->card);
+        if (ret < 0) {
+                kfree(gosnd);
+                return ret;
+        }
+        ret = snd_device_new(gosnd->card, SNDRV_DEV_LOWLEVEL, go,
+                        &go7007_snd_device_ops);
+        if (ret < 0) {
+                kfree(gosnd);
+                return ret;
+        }
+        ret = snd_pcm_new(gosnd->card, "go7007", 0, 0, 1, &gosnd->pcm);
+        if (ret < 0) {
+                snd_card_free(gosnd->card);
+                kfree(gosnd);
+                return ret;
+        }
+        strlcpy(gosnd->card->driver, "go7007", sizeof(gosnd->card->driver));
+        strlcpy(gosnd->card->shortname, go->name, sizeof(gosnd->card->driver));
+        strlcpy(gosnd->card->longname, gosnd->card->shortname,
+                        sizeof(gosnd->card->longname));
+
+        gosnd->pcm->private_data = go;
+        snd_pcm_set_ops(gosnd->pcm, SNDRV_PCM_STREAM_CAPTURE,
+                        &go7007_snd_capture_ops);
+
+        ret = snd_card_register(gosnd->card);
+        if (ret < 0) {
+                snd_card_free(gosnd->card);
+                kfree(gosnd);
+                return ret;
+        }
+
+        gosnd->substream = NULL;
+        go->snd_context = gosnd;
+        v4l2_device_get(&go->v4l2_dev);
+        ++dev;
+
+        return 0;
+}
+EXPORT_SYMBOL(go7007_snd_init);
+
+int go7007_snd_remove(struct go7007 *go)
+{
+        struct go7007_snd *gosnd = go->snd_context;
+
+        snd_card_disconnect(gosnd->card);
+        snd_card_free_when_closed(gosnd->card);
+        v4l2_device_put(&go->v4l2_dev);
+        return 0;
+}
+EXPORT_SYMBOL(go7007_snd_remove);
+
+MODULE_LICENSE("GPL v2");