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path: root/drivers/media/usb/usbtv/usbtv-audio.c
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Diffstat (limited to 'drivers/media/usb/usbtv/usbtv-audio.c')
-rw-r--r--drivers/media/usb/usbtv/usbtv-audio.c385
1 files changed, 385 insertions, 0 deletions
diff --git a/drivers/media/usb/usbtv/usbtv-audio.c b/drivers/media/usb/usbtv/usbtv-audio.c
new file mode 100644
index 0000000..78c12d2
--- /dev/null
+++ b/drivers/media/usb/usbtv/usbtv-audio.c
@@ -0,0 +1,385 @@
+/*
+ * Fushicai USBTV007 Audio-Video Grabber Driver
+ *
+ * Product web site:
+ * http://www.fushicai.com/products_detail/&productId=d05449ee-b690-42f9-a661-aa7353894bed.html
+ *
+ * Copyright (c) 2013 Federico Simoncelli
+ * All rights reserved.
+ * No physical hardware was harmed running Windows during the
+ * reverse-engineering activity
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions, and the following disclaimer,
+ * without modification.
+ * 2. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL").
+ */
+
+#include <sound/core.h>
+#include <sound/initval.h>
+#include <sound/ac97_codec.h>
+#include <sound/pcm_params.h>
+
+#include "usbtv.h"
+
+static struct snd_pcm_hardware snd_usbtv_digital_hw = {
+ .info = SNDRV_PCM_INFO_BATCH |
+ 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,
+ .period_bytes_min = 11059,
+ .period_bytes_max = 13516,
+ .periods_min = 2,
+ .periods_max = 98,
+ .buffer_bytes_max = 62720 * 8, /* value in usbaudio.c */
+};
+
+static int snd_usbtv_pcm_open(struct snd_pcm_substream *substream)
+{
+ struct usbtv *chip = snd_pcm_substream_chip(substream);
+ struct snd_pcm_runtime *runtime = substream->runtime;
+
+ chip->snd_substream = substream;
+ runtime->hw = snd_usbtv_digital_hw;
+
+ return 0;
+}
+
+static int snd_usbtv_pcm_close(struct snd_pcm_substream *substream)
+{
+ struct usbtv *chip = snd_pcm_substream_chip(substream);
+
+ if (atomic_read(&chip->snd_stream)) {
+ atomic_set(&chip->snd_stream, 0);
+ schedule_work(&chip->snd_trigger);
+ }
+
+ return 0;
+}
+
+static int snd_usbtv_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *hw_params)
+{
+ int rv;
+ struct usbtv *chip = snd_pcm_substream_chip(substream);
+
+ rv = snd_pcm_lib_malloc_pages(substream,
+ params_buffer_bytes(hw_params));
+
+ if (rv < 0) {
+ dev_warn(chip->dev, "pcm audio buffer allocation failure %i\n",
+ rv);
+ return rv;
+ }
+
+ return 0;
+}
+
+static int snd_usbtv_hw_free(struct snd_pcm_substream *substream)
+{
+ snd_pcm_lib_free_pages(substream);
+ return 0;
+}
+
+static int snd_usbtv_prepare(struct snd_pcm_substream *substream)
+{
+ struct usbtv *chip = snd_pcm_substream_chip(substream);
+
+ chip->snd_buffer_pos = 0;
+ chip->snd_period_pos = 0;
+
+ return 0;
+}
+
+static void usbtv_audio_urb_received(struct urb *urb)
+{
+ struct usbtv *chip = urb->context;
+ struct snd_pcm_substream *substream = chip->snd_substream;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ size_t i, frame_bytes, chunk_length, buffer_pos, period_pos;
+ int period_elapsed;
+ void *urb_current;
+
+ switch (urb->status) {
+ case 0:
+ case -ETIMEDOUT:
+ break;
+ case -ENOENT:
+ case -EPROTO:
+ case -ECONNRESET:
+ case -ESHUTDOWN:
+ return;
+ default:
+ dev_warn(chip->dev, "unknown audio urb status %i\n",
+ urb->status);
+ }
+
+ if (!atomic_read(&chip->snd_stream))
+ return;
+
+ frame_bytes = runtime->frame_bits >> 3;
+ chunk_length = USBTV_CHUNK / frame_bytes;
+
+ buffer_pos = chip->snd_buffer_pos;
+ period_pos = chip->snd_period_pos;
+ period_elapsed = 0;
+
+ for (i = 0; i < urb->actual_length; i += USBTV_CHUNK_SIZE) {
+ urb_current = urb->transfer_buffer + i + USBTV_AUDIO_HDRSIZE;
+
+ if (buffer_pos + chunk_length >= runtime->buffer_size) {
+ size_t cnt = (runtime->buffer_size - buffer_pos) *
+ frame_bytes;
+ memcpy(runtime->dma_area + buffer_pos * frame_bytes,
+ urb_current, cnt);
+ memcpy(runtime->dma_area, urb_current + cnt,
+ chunk_length * frame_bytes - cnt);
+ } else {
+ memcpy(runtime->dma_area + buffer_pos * frame_bytes,
+ urb_current, chunk_length * frame_bytes);
+ }
+
+ buffer_pos += chunk_length;
+ period_pos += chunk_length;
+
+ if (buffer_pos >= runtime->buffer_size)
+ buffer_pos -= runtime->buffer_size;
+
+ if (period_pos >= runtime->period_size) {
+ period_pos -= runtime->period_size;
+ period_elapsed = 1;
+ }
+ }
+
+ snd_pcm_stream_lock(substream);
+
+ chip->snd_buffer_pos = buffer_pos;
+ chip->snd_period_pos = period_pos;
+
+ snd_pcm_stream_unlock(substream);
+
+ if (period_elapsed)
+ snd_pcm_period_elapsed(substream);
+
+ usb_submit_urb(urb, GFP_ATOMIC);
+}
+
+static int usbtv_audio_start(struct usbtv *chip)
+{
+ unsigned int pipe;
+ static const u16 setup[][2] = {
+ /* These seem to enable the device. */
+ { USBTV_BASE + 0x0008, 0x0001 },
+ { USBTV_BASE + 0x01d0, 0x00ff },
+ { USBTV_BASE + 0x01d9, 0x0002 },
+
+ { USBTV_BASE + 0x01da, 0x0013 },
+ { USBTV_BASE + 0x01db, 0x0012 },
+ { USBTV_BASE + 0x01e9, 0x0002 },
+ { USBTV_BASE + 0x01ec, 0x006c },
+ { USBTV_BASE + 0x0294, 0x0020 },
+ { USBTV_BASE + 0x0255, 0x00cf },
+ { USBTV_BASE + 0x0256, 0x0020 },
+ { USBTV_BASE + 0x01eb, 0x0030 },
+ { USBTV_BASE + 0x027d, 0x00a6 },
+ { USBTV_BASE + 0x0280, 0x0011 },
+ { USBTV_BASE + 0x0281, 0x0040 },
+ { USBTV_BASE + 0x0282, 0x0011 },
+ { USBTV_BASE + 0x0283, 0x0040 },
+ { 0xf891, 0x0010 },
+
+ /* this sets the input from composite */
+ { USBTV_BASE + 0x0284, 0x00aa },
+ };
+
+ chip->snd_bulk_urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (chip->snd_bulk_urb == NULL)
+ goto err_alloc_urb;
+
+ pipe = usb_rcvbulkpipe(chip->udev, USBTV_AUDIO_ENDP);
+
+ chip->snd_bulk_urb->transfer_buffer = kzalloc(
+ USBTV_AUDIO_URBSIZE, GFP_KERNEL);
+ if (chip->snd_bulk_urb->transfer_buffer == NULL)
+ goto err_transfer_buffer;
+
+ usb_fill_bulk_urb(chip->snd_bulk_urb, chip->udev, pipe,
+ chip->snd_bulk_urb->transfer_buffer, USBTV_AUDIO_URBSIZE,
+ usbtv_audio_urb_received, chip);
+
+ /* starting the stream */
+ usbtv_set_regs(chip, setup, ARRAY_SIZE(setup));
+
+ usb_clear_halt(chip->udev, pipe);
+ usb_submit_urb(chip->snd_bulk_urb, GFP_ATOMIC);
+
+ return 0;
+
+err_transfer_buffer:
+ usb_free_urb(chip->snd_bulk_urb);
+ chip->snd_bulk_urb = NULL;
+
+err_alloc_urb:
+ return -ENOMEM;
+}
+
+static int usbtv_audio_stop(struct usbtv *chip)
+{
+ static const u16 setup[][2] = {
+ /* The original windows driver sometimes sends also:
+ * { USBTV_BASE + 0x00a2, 0x0013 }
+ * but it seems useless and its real effects are untested at
+ * the moment.
+ */
+ { USBTV_BASE + 0x027d, 0x0000 },
+ { USBTV_BASE + 0x0280, 0x0010 },
+ { USBTV_BASE + 0x0282, 0x0010 },
+ };
+
+ if (chip->snd_bulk_urb) {
+ usb_kill_urb(chip->snd_bulk_urb);
+ kfree(chip->snd_bulk_urb->transfer_buffer);
+ usb_free_urb(chip->snd_bulk_urb);
+ chip->snd_bulk_urb = NULL;
+ }
+
+ usbtv_set_regs(chip, setup, ARRAY_SIZE(setup));
+
+ return 0;
+}
+
+void usbtv_audio_suspend(struct usbtv *usbtv)
+{
+ if (atomic_read(&usbtv->snd_stream) && usbtv->snd_bulk_urb)
+ usb_kill_urb(usbtv->snd_bulk_urb);
+}
+
+void usbtv_audio_resume(struct usbtv *usbtv)
+{
+ if (atomic_read(&usbtv->snd_stream) && usbtv->snd_bulk_urb)
+ usb_submit_urb(usbtv->snd_bulk_urb, GFP_ATOMIC);
+}
+
+static void snd_usbtv_trigger(struct work_struct *work)
+{
+ struct usbtv *chip = container_of(work, struct usbtv, snd_trigger);
+
+ if (atomic_read(&chip->snd_stream))
+ usbtv_audio_start(chip);
+ else
+ usbtv_audio_stop(chip);
+}
+
+static int snd_usbtv_card_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ struct usbtv *chip = snd_pcm_substream_chip(substream);
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ atomic_set(&chip->snd_stream, 1);
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ atomic_set(&chip->snd_stream, 0);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ schedule_work(&chip->snd_trigger);
+
+ return 0;
+}
+
+static snd_pcm_uframes_t snd_usbtv_pointer(struct snd_pcm_substream *substream)
+{
+ struct usbtv *chip = snd_pcm_substream_chip(substream);
+
+ return chip->snd_buffer_pos;
+}
+
+static struct snd_pcm_ops snd_usbtv_pcm_ops = {
+ .open = snd_usbtv_pcm_open,
+ .close = snd_usbtv_pcm_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = snd_usbtv_hw_params,
+ .hw_free = snd_usbtv_hw_free,
+ .prepare = snd_usbtv_prepare,
+ .trigger = snd_usbtv_card_trigger,
+ .pointer = snd_usbtv_pointer,
+};
+
+int usbtv_audio_init(struct usbtv *usbtv)
+{
+ int rv;
+ struct snd_card *card;
+ struct snd_pcm *pcm;
+
+ INIT_WORK(&usbtv->snd_trigger, snd_usbtv_trigger);
+ atomic_set(&usbtv->snd_stream, 0);
+
+ rv = snd_card_new(&usbtv->udev->dev, SNDRV_DEFAULT_IDX1, "usbtv",
+ THIS_MODULE, 0, &card);
+ if (rv < 0)
+ return rv;
+
+ strlcpy(card->driver, usbtv->dev->driver->name, sizeof(card->driver));
+ strlcpy(card->shortname, "usbtv", sizeof(card->shortname));
+ snprintf(card->longname, sizeof(card->longname),
+ "USBTV Audio at bus %d device %d", usbtv->udev->bus->busnum,
+ usbtv->udev->devnum);
+
+ snd_card_set_dev(card, usbtv->dev);
+
+ usbtv->snd = card;
+
+ rv = snd_pcm_new(card, "USBTV Audio", 0, 0, 1, &pcm);
+ if (rv < 0)
+ goto err;
+
+ strlcpy(pcm->name, "USBTV Audio Input", sizeof(pcm->name));
+ pcm->info_flags = 0;
+ pcm->private_data = usbtv;
+
+ snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_usbtv_pcm_ops);
+ snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
+ snd_dma_continuous_data(GFP_KERNEL), USBTV_AUDIO_BUFFER,
+ USBTV_AUDIO_BUFFER);
+
+ rv = snd_card_register(card);
+ if (rv)
+ goto err;
+
+ return 0;
+
+err:
+ usbtv->snd = NULL;
+ snd_card_free(card);
+
+ return rv;
+}
+
+void usbtv_audio_free(struct usbtv *usbtv)
+{
+ if (usbtv->snd && usbtv->udev) {
+ snd_card_free(usbtv->snd);
+ usbtv->snd = NULL;
+ }
+}

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