eea0579fc8
With the callback mode HRTIMER_CB_IRQSAFE_UNLOCK, the start of the stream with zero delay doesn't work. Since IRQSAFE mode is removed, we have to change the pcsp start-up code. This patch splits the callback function to two parts, the triggering of the port and the calculation of the expire time, and the update of the ALSA PCM core. The first part is called both from the trigger-start and the hrtimer callback while the latter is handled only in the hrtimer callback. Signed-off-by: Takashi Iwai <tiwai@suse.de>
88 lines
2.3 KiB
C
88 lines
2.3 KiB
C
/*
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* PC-Speaker driver for Linux
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*
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* Copyright (C) 1993-1997 Michael Beck
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* Copyright (C) 1997-2001 David Woodhouse
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* Copyright (C) 2001-2008 Stas Sergeev
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*/
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#ifndef __PCSP_H__
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#define __PCSP_H__
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#include <linux/hrtimer.h>
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#if defined(CONFIG_MIPS) || defined(CONFIG_X86)
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/* Use the global PIT lock ! */
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#include <asm/i8253.h>
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#else
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#include <asm/8253pit.h>
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static DEFINE_SPINLOCK(i8253_lock);
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#endif
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#define PCSP_SOUND_VERSION 0x400 /* read 4.00 */
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#define PCSP_DEBUG 0
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/* default timer freq for PC-Speaker: 18643 Hz */
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#define DIV_18KHZ 64
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#define MAX_DIV DIV_18KHZ
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#define CALC_DIV(d) (MAX_DIV >> (d))
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#define CUR_DIV() CALC_DIV(chip->treble)
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#define PCSP_MAX_TREBLE 1
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/* unfortunately, with hrtimers 37KHz does not work very well :( */
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#define PCSP_DEFAULT_TREBLE 0
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#define MIN_DIV (MAX_DIV >> PCSP_MAX_TREBLE)
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/* wild guess */
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#define PCSP_MIN_LPJ 1000000
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#define PCSP_DEFAULT_SDIV (DIV_18KHZ >> 1)
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#define PCSP_DEFAULT_SRATE (PIT_TICK_RATE / PCSP_DEFAULT_SDIV)
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#define PCSP_INDEX_INC() (1 << (PCSP_MAX_TREBLE - chip->treble))
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#define PCSP_CALC_RATE(i) (PIT_TICK_RATE / CALC_DIV(i))
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#define PCSP_RATE() PCSP_CALC_RATE(chip->treble)
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#define PCSP_MIN_RATE__1 MAX_DIV/PIT_TICK_RATE
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#define PCSP_MAX_RATE__1 MIN_DIV/PIT_TICK_RATE
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#define PCSP_MAX_PERIOD_NS (1000000000ULL * PCSP_MIN_RATE__1)
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#define PCSP_MIN_PERIOD_NS (1000000000ULL * PCSP_MAX_RATE__1)
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#define PCSP_CALC_NS(div) ({ \
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u64 __val = 1000000000ULL * (div); \
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do_div(__val, PIT_TICK_RATE); \
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__val; \
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})
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#define PCSP_PERIOD_NS() PCSP_CALC_NS(CUR_DIV())
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#define PCSP_MAX_PERIOD_SIZE (64*1024)
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#define PCSP_MAX_PERIODS 512
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#define PCSP_BUFFER_SIZE (128*1024)
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struct snd_pcsp {
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struct snd_card *card;
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struct snd_pcm *pcm;
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struct input_dev *input_dev;
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struct hrtimer timer;
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unsigned short port, irq, dma;
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spinlock_t substream_lock;
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struct snd_pcm_substream *playback_substream;
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unsigned int fmt_size;
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unsigned int is_signed;
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size_t playback_ptr;
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size_t period_ptr;
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atomic_t timer_active;
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int thalf;
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u64 ns_rem;
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unsigned char val61;
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int enable;
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int max_treble;
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int treble;
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int pcspkr;
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};
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extern struct snd_pcsp pcsp_chip;
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extern enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle);
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extern void pcsp_sync_stop(struct snd_pcsp *chip);
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extern int snd_pcsp_new_pcm(struct snd_pcsp *chip);
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extern int snd_pcsp_new_mixer(struct snd_pcsp *chip);
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#endif
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