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1/* SPDX-License-Identifier: GPL-2.0-or-later */2/*3 * Linux driver for TerraTec DMX 6Fire USB4 *5 * Author: Torsten Schenk <torsten.schenk@zoho.com>6 * Created: Jan 01, 20117 * Copyright: (C) Torsten Schenk8 */9 10#ifndef USB6FIRE_PCM_H11#define USB6FIRE_PCM_H12 13#include <sound/pcm.h>14#include <linux/mutex.h>15 16#include "common.h"17 18enum /* settings for pcm */19{20 /* maximum of EP_W_MAX_PACKET_SIZE[] (see firmware.c) */21 PCM_N_URBS = 16, PCM_N_PACKETS_PER_URB = 8, PCM_MAX_PACKET_SIZE = 60422};23 24struct pcm_urb {25 struct sfire_chip *chip;26 27 /* BEGIN DO NOT SEPARATE */28 struct urb instance;29 struct usb_iso_packet_descriptor packets[PCM_N_PACKETS_PER_URB];30 /* END DO NOT SEPARATE */31 u8 *buffer;32 33 struct pcm_urb *peer;34};35 36struct pcm_substream {37 spinlock_t lock;38 struct snd_pcm_substream *instance;39 40 bool active;41 42 snd_pcm_uframes_t dma_off; /* current position in alsa dma_area */43 snd_pcm_uframes_t period_off; /* current position in current period */44};45 46struct pcm_runtime {47 struct sfire_chip *chip;48 struct snd_pcm *instance;49 50 struct pcm_substream playback;51 struct pcm_substream capture;52 bool panic; /* if set driver won't do anymore pcm on device */53 54 struct pcm_urb in_urbs[PCM_N_URBS];55 struct pcm_urb out_urbs[PCM_N_URBS];56 int in_packet_size;57 int out_packet_size;58 int in_n_analog; /* number of analog channels soundcard sends */59 int out_n_analog; /* number of analog channels soundcard receives */60 61 struct mutex stream_mutex;62 u8 stream_state; /* one of STREAM_XXX (pcm.c) */63 u8 rate; /* one of PCM_RATE_XXX */64 wait_queue_head_t stream_wait_queue;65 bool stream_wait_cond;66};67 68int usb6fire_pcm_init(struct sfire_chip *chip);69void usb6fire_pcm_abort(struct sfire_chip *chip);70void usb6fire_pcm_destroy(struct sfire_chip *chip);71#endif /* USB6FIRE_PCM_H */72