1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * PC-Speaker driver for Linux
4 *
5 * Copyright (C) 1993-1997 Michael Beck
6 * Copyright (C) 1997-2001 David Woodhouse
7 * Copyright (C) 2001-2008 Stas Sergeev
8 */
9
10 #ifndef __PCSP_H__
11 #define __PCSP_H__
12
13 #include <linux/hrtimer.h>
14 #include <linux/i8253.h>
15 #include <linux/timex.h>
16
17 #define PCSP_SOUND_VERSION 0x400 /* read 4.00 */
18 #define PCSP_DEBUG 0
19
20 /* default timer freq for PC-Speaker: 18643 Hz */
21 #define DIV_18KHZ 64
22 #define MAX_DIV DIV_18KHZ
23 #define CALC_DIV(d) (MAX_DIV >> (d))
24 #define CUR_DIV() CALC_DIV(chip->treble)
25 #define PCSP_MAX_TREBLE 1
26
27 /* unfortunately, with hrtimers 37KHz does not work very well :( */
28 #define PCSP_DEFAULT_TREBLE 0
29 #define MIN_DIV (MAX_DIV >> PCSP_MAX_TREBLE)
30
31 /* wild guess */
32 #define PCSP_MIN_LPJ 1000000
33 #define PCSP_DEFAULT_SDIV (DIV_18KHZ >> 1)
34 #define PCSP_DEFAULT_SRATE (PIT_TICK_RATE / PCSP_DEFAULT_SDIV)
35 #define PCSP_INDEX_INC() (1 << (PCSP_MAX_TREBLE - chip->treble))
36 #define PCSP_CALC_RATE(i) (PIT_TICK_RATE / CALC_DIV(i))
37 #define PCSP_RATE() PCSP_CALC_RATE(chip->treble)
38 #define PCSP_MIN_RATE__1 MAX_DIV/PIT_TICK_RATE
39 #define PCSP_MAX_RATE__1 MIN_DIV/PIT_TICK_RATE
40 #define PCSP_MAX_PERIOD_NS (1000000000ULL * PCSP_MIN_RATE__1)
41 #define PCSP_MIN_PERIOD_NS (1000000000ULL * PCSP_MAX_RATE__1)
42 #define PCSP_CALC_NS(div) ({ \
43 u64 __val = 1000000000ULL * (div); \
44 do_div(__val, PIT_TICK_RATE); \
45 __val; \
46 })
47 #define PCSP_PERIOD_NS() PCSP_CALC_NS(CUR_DIV())
48
49 #define PCSP_MAX_PERIOD_SIZE (64*1024)
50 #define PCSP_MAX_PERIODS 512
51 #define PCSP_BUFFER_SIZE (128*1024)
52
53 struct snd_pcsp {
54 struct snd_card *card;
55 struct snd_pcm *pcm;
56 struct input_dev *input_dev;
57 struct hrtimer timer;
58 unsigned short port, irq, dma;
59 spinlock_t substream_lock;
60 struct snd_pcm_substream *playback_substream;
61 unsigned int fmt_size;
62 unsigned int is_signed;
63 size_t playback_ptr;
64 size_t period_ptr;
65 atomic_t timer_active;
66 int thalf;
67 u64 ns_rem;
68 unsigned char val61;
69 int enable;
70 int max_treble;
71 int treble;
72 int pcspkr;
73 };
74
75 extern struct snd_pcsp pcsp_chip;
76
77 extern enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle);
78 extern void pcsp_sync_stop(struct snd_pcsp *chip);
79
80 extern int snd_pcsp_new_pcm(struct snd_pcsp *chip);
81 extern int snd_pcsp_new_mixer(struct snd_pcsp *chip, int nopcm);
82
83 #endif
84
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