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
22enum /* 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
28struct 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
40struct 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
50struct 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
72int usb6fire_pcm_init(struct sfire_chip *chip);
73void usb6fire_pcm_abort(struct sfire_chip *chip);
74void usb6fire_pcm_destroy(struct sfire_chip *chip);
75#endif /* USB6FIRE_PCM_H */
76