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-rw-r--r--sound/usb/6fire/pcm.h76
1 files changed, 76 insertions, 0 deletions
diff --git a/sound/usb/6fire/pcm.h b/sound/usb/6fire/pcm.h
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+++ b/sound/usb/6fire/pcm.h
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+/*
+ * Linux driver for TerraTec DMX 6Fire USB
+ *
+ * Author: Torsten Schenk <torsten.schenk@zoho.com>
+ * Created: Jan 01, 2011
+ * Version: 0.3.0
+ * Copyright: (C) Torsten Schenk
+ *
+ * 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.
+ */
+
+#ifndef USB6FIRE_PCM_H
+#define USB6FIRE_PCM_H
+
+#include <sound/pcm.h>
+#include <linux/mutex.h>
+
+#include "common.h"
+
+enum /* settings for pcm */
+{
+ /* maximum of EP_W_MAX_PACKET_SIZE[] (see firmware.c) */
+ PCM_N_URBS = 16, PCM_N_PACKETS_PER_URB = 8, PCM_MAX_PACKET_SIZE = 604
+};
+
+struct pcm_urb {
+ struct sfire_chip *chip;
+
+ /* BEGIN DO NOT SEPARATE */
+ struct urb instance;
+ struct usb_iso_packet_descriptor packets[PCM_N_PACKETS_PER_URB];
+ /* END DO NOT SEPARATE */
+ u8 buffer[PCM_N_PACKETS_PER_URB * PCM_MAX_PACKET_SIZE];
+
+ struct pcm_urb *peer;
+};
+
+struct pcm_substream {
+ spinlock_t lock;
+ struct snd_pcm_substream *instance;
+
+ bool active;
+
+ snd_pcm_uframes_t dma_off; /* current position in alsa dma_area */
+ snd_pcm_uframes_t period_off; /* current position in current period */
+};
+
+struct pcm_runtime {
+ struct sfire_chip *chip;
+ struct snd_pcm *instance;
+
+ struct pcm_substream playback;
+ struct pcm_substream capture;
+ bool panic; /* if set driver won't do anymore pcm on device */
+
+ struct pcm_urb in_urbs[PCM_N_URBS];
+ struct pcm_urb out_urbs[PCM_N_URBS];
+ int in_packet_size;
+ int out_packet_size;
+ int in_n_analog; /* number of analog channels soundcard sends */
+ int out_n_analog; /* number of analog channels soundcard receives */
+
+ struct mutex stream_mutex;
+ u8 stream_state; /* one of STREAM_XXX (pcm.c) */
+ u8 rate; /* one of PCM_RATE_XXX */
+ wait_queue_head_t stream_wait_queue;
+ bool stream_wait_cond;
+};
+
+int __devinit usb6fire_pcm_init(struct sfire_chip *chip);
+void usb6fire_pcm_abort(struct sfire_chip *chip);
+void usb6fire_pcm_destroy(struct sfire_chip *chip);
+#endif /* USB6FIRE_PCM_H */