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