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