xref: /linux/sound/usb/6fire/pcm.h (revision 75bf465f0bc33e9b776a46d6a1b9b990f5fb7c37)
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  * Linux driver for TerraTec DMX 6Fire USB
4  *
5  * Author:	Torsten Schenk <torsten.schenk@zoho.com>
6  * Created:	Jan 01, 2011
7  * Copyright:	(C) Torsten Schenk
8  */
9 
10 #ifndef USB6FIRE_PCM_H
11 #define USB6FIRE_PCM_H
12 
13 #include <sound/pcm.h>
14 #include <linux/mutex.h>
15 
16 #include "common.h"
17 
18 enum /* 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 = 604
22 };
23 
24 struct 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 
36 struct 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 
46 struct 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 
68 int usb6fire_pcm_init(struct sfire_chip *chip);
69 void usb6fire_pcm_abort(struct sfire_chip *chip);
70 void usb6fire_pcm_destroy(struct sfire_chip *chip);
71 #endif /* USB6FIRE_PCM_H */
72