diff options
Diffstat (limited to 'sound/usb/6fire/pcm.h')
| -rw-r--r-- | sound/usb/6fire/pcm.h | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/sound/usb/6fire/pcm.h b/sound/usb/6fire/pcm.h new file mode 100644 index 0000000000..5a092dfd69 --- /dev/null +++ b/sound/usb/6fire/pcm.h @@ -0,0 +1,71 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Linux driver for TerraTec DMX 6Fire USB + * + * Author: Torsten Schenk <torsten.schenk@zoho.com> + * Created: Jan 01, 2011 + * Copyright: (C) Torsten Schenk + */ + +#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; + + 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 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 */ |