1 /* 2 * Linux driver for TerraTec DMX 6Fire USB 3 * 4 * Author: Torsten Schenk <torsten.schenk@zoho.com> 5 * Created: Jan 01, 2011 6 * Version: 0.3.0 7 * Copyright: (C) Torsten Schenk 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or 12 * (at your option) any later version. 13 */ 14 15 #ifndef USB6FIRE_PCM_H 16 #define USB6FIRE_PCM_H 17 18 #include <sound/pcm.h> 19 #include <linux/mutex.h> 20 21 #include "common.h" 22 23 enum /* settings for pcm */ 24 { 25 /* maximum of EP_W_MAX_PACKET_SIZE[] (see firmware.c) */ 26 PCM_N_URBS = 16, PCM_N_PACKETS_PER_URB = 8, PCM_MAX_PACKET_SIZE = 604 27 }; 28 29 struct pcm_urb { 30 struct sfire_chip *chip; 31 32 /* BEGIN DO NOT SEPARATE */ 33 struct urb instance; 34 struct usb_iso_packet_descriptor packets[PCM_N_PACKETS_PER_URB]; 35 /* END DO NOT SEPARATE */ 36 u8 buffer[PCM_N_PACKETS_PER_URB * PCM_MAX_PACKET_SIZE]; 37 38 struct pcm_urb *peer; 39 }; 40 41 struct pcm_substream { 42 spinlock_t lock; 43 struct snd_pcm_substream *instance; 44 45 bool active; 46 47 snd_pcm_uframes_t dma_off; /* current position in alsa dma_area */ 48 snd_pcm_uframes_t period_off; /* current position in current period */ 49 }; 50 51 struct pcm_runtime { 52 struct sfire_chip *chip; 53 struct snd_pcm *instance; 54 55 struct pcm_substream playback; 56 struct pcm_substream capture; 57 bool panic; /* if set driver won't do anymore pcm on device */ 58 59 struct pcm_urb in_urbs[PCM_N_URBS]; 60 struct pcm_urb out_urbs[PCM_N_URBS]; 61 int in_packet_size; 62 int out_packet_size; 63 int in_n_analog; /* number of analog channels soundcard sends */ 64 int out_n_analog; /* number of analog channels soundcard receives */ 65 66 struct mutex stream_mutex; 67 u8 stream_state; /* one of STREAM_XXX (pcm.c) */ 68 u8 rate; /* one of PCM_RATE_XXX */ 69 wait_queue_head_t stream_wait_queue; 70 bool stream_wait_cond; 71 }; 72 73 int __devinit usb6fire_pcm_init(struct sfire_chip *chip); 74 void usb6fire_pcm_abort(struct sfire_chip *chip); 75 void usb6fire_pcm_destroy(struct sfire_chip *chip); 76 #endif /* USB6FIRE_PCM_H */ 77