| Stas Sergeev | 9ab4d07 | 2008-03-03 10:53:54 +0100 | [diff] [blame^] | 1 | /* |
| 2 | * PC-Speaker driver for Linux |
| 3 | * |
| 4 | * Copyright (C) 1993-1997 Michael Beck |
| 5 | * Copyright (C) 1997-2001 David Woodhouse |
| 6 | * Copyright (C) 2001-2008 Stas Sergeev |
| 7 | */ |
| 8 | |
| 9 | #ifndef __PCSP_H__ |
| 10 | #define __PCSP_H__ |
| 11 | |
| 12 | #include <linux/hrtimer.h> |
| 13 | #if defined(CONFIG_MIPS) || defined(CONFIG_X86) |
| 14 | /* Use the global PIT lock ! */ |
| 15 | #include <asm/i8253.h> |
| 16 | #else |
| 17 | #include <asm/8253pit.h> |
| 18 | static DEFINE_SPINLOCK(i8253_lock); |
| 19 | #endif |
| 20 | |
| 21 | #define PCSP_SOUND_VERSION 0x400 /* read 4.00 */ |
| 22 | #define PCSP_DEBUG 0 |
| 23 | |
| 24 | /* default timer freq for PC-Speaker: 18643 Hz */ |
| 25 | #define DIV_18KHZ 64 |
| 26 | #define MAX_DIV DIV_18KHZ |
| 27 | #define CUR_DIV() (MAX_DIV >> chip->treble) |
| 28 | #define PCSP_MAX_TREBLE 1 |
| 29 | |
| 30 | /* unfortunately, with hrtimers 37KHz does not work very well :( */ |
| 31 | #define PCSP_DEFAULT_TREBLE 0 |
| 32 | #define MIN_DIV (MAX_DIV >> PCSP_MAX_TREBLE) |
| 33 | |
| 34 | /* wild guess */ |
| 35 | #define PCSP_MIN_LPJ 1000000 |
| 36 | #define PCSP_DEFAULT_SDIV (DIV_18KHZ >> 1) |
| 37 | #define PCSP_DEFAULT_SRATE (PIT_TICK_RATE / PCSP_DEFAULT_SDIV) |
| 38 | #define PCSP_INDEX_INC() (1 << (PCSP_MAX_TREBLE - chip->treble)) |
| 39 | #define PCSP_RATE() (PIT_TICK_RATE / CUR_DIV()) |
| 40 | #define PCSP_MIN_RATE__1 MAX_DIV/PIT_TICK_RATE |
| 41 | #define PCSP_MAX_RATE__1 MIN_DIV/PIT_TICK_RATE |
| 42 | #define PCSP_MAX_PERIOD_NS (1000000000ULL * PCSP_MIN_RATE__1) |
| 43 | #define PCSP_MIN_PERIOD_NS (1000000000ULL * PCSP_MAX_RATE__1) |
| 44 | #define PCSP_CALC_NS(div) ({ \ |
| 45 | u64 __val = 1000000000ULL * (div); \ |
| 46 | do_div(__val, PIT_TICK_RATE); \ |
| 47 | __val; \ |
| 48 | }) |
| 49 | #define PCSP_PERIOD_NS() PCSP_CALC_NS(CUR_DIV()) |
| 50 | |
| 51 | #define PCSP_MAX_PERIOD_SIZE (64*1024) |
| 52 | #define PCSP_MAX_PERIODS 512 |
| 53 | #define PCSP_BUFFER_SIZE (128*1024) |
| 54 | |
| 55 | struct snd_pcsp { |
| 56 | struct snd_card *card; |
| 57 | struct snd_pcm *pcm; |
| 58 | struct input_dev *input_dev; |
| 59 | struct hrtimer timer; |
| 60 | unsigned short port, irq, dma; |
| 61 | spinlock_t substream_lock; |
| 62 | struct snd_pcm_substream *playback_substream; |
| 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 | |
| 79 | extern int snd_pcsp_new_pcm(struct snd_pcsp *chip); |
| 80 | extern int snd_pcsp_new_mixer(struct snd_pcsp *chip); |
| 81 | |
| 82 | #endif |