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
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