Initial import

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 000000000..d22d7d574
--- /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");