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authorStas Sergeev <stsp@aknet.ru>2008-03-03 10:53:54 +0100
committerTakashi Iwai <tiwai@suse.de>2008-04-24 12:00:20 +0200
commit9ab4d072ad67793d70b8707e14fb9261749c4e07 (patch)
treec6ae32f1d3d3b273fae30b0fa59b8c79bd5e8044 /sound/drivers/pcsp/pcsp.h
parent40ac8c4f208111cdc1542ccc9feb21b98a6b0219 (diff)
[ALSA] Add PC-speaker sound driver
Added PC-speaker sound driver (snd-pcsp). Signed-off-by: Stas Sergeev <stsp@aknet.ru> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/drivers/pcsp/pcsp.h')
-rw-r--r--sound/drivers/pcsp/pcsp.h82
1 files changed, 82 insertions, 0 deletions
diff --git a/sound/drivers/pcsp/pcsp.h b/sound/drivers/pcsp/pcsp.h
new file mode 100644
index 00000000000..f07cc1ee1fe
--- /dev/null
+++ b/sound/drivers/pcsp/pcsp.h
@@ -0,0 +1,82 @@
+/*
+ * PC-Speaker driver for Linux
+ *
+ * Copyright (C) 1993-1997 Michael Beck
+ * Copyright (C) 1997-2001 David Woodhouse
+ * Copyright (C) 2001-2008 Stas Sergeev
+ */
+
+#ifndef __PCSP_H__
+#define __PCSP_H__
+
+#include <linux/hrtimer.h>
+#if defined(CONFIG_MIPS) || defined(CONFIG_X86)
+/* Use the global PIT lock ! */
+#include <asm/i8253.h>
+#else
+#include <asm/8253pit.h>
+static DEFINE_SPINLOCK(i8253_lock);
+#endif
+
+#define PCSP_SOUND_VERSION 0x400 /* read 4.00 */
+#define PCSP_DEBUG 0
+
+/* default timer freq for PC-Speaker: 18643 Hz */
+#define DIV_18KHZ 64
+#define MAX_DIV DIV_18KHZ
+#define CUR_DIV() (MAX_DIV >> chip->treble)
+#define PCSP_MAX_TREBLE 1
+
+/* unfortunately, with hrtimers 37KHz does not work very well :( */
+#define PCSP_DEFAULT_TREBLE 0
+#define MIN_DIV (MAX_DIV >> PCSP_MAX_TREBLE)
+
+/* wild guess */
+#define PCSP_MIN_LPJ 1000000
+#define PCSP_DEFAULT_SDIV (DIV_18KHZ >> 1)
+#define PCSP_DEFAULT_SRATE (PIT_TICK_RATE / PCSP_DEFAULT_SDIV)
+#define PCSP_INDEX_INC() (1 << (PCSP_MAX_TREBLE - chip->treble))
+#define PCSP_RATE() (PIT_TICK_RATE / CUR_DIV())
+#define PCSP_MIN_RATE__1 MAX_DIV/PIT_TICK_RATE
+#define PCSP_MAX_RATE__1 MIN_DIV/PIT_TICK_RATE
+#define PCSP_MAX_PERIOD_NS (1000000000ULL * PCSP_MIN_RATE__1)
+#define PCSP_MIN_PERIOD_NS (1000000000ULL * PCSP_MAX_RATE__1)
+#define PCSP_CALC_NS(div) ({ \
+ u64 __val = 1000000000ULL * (div); \
+ do_div(__val, PIT_TICK_RATE); \
+ __val; \
+})
+#define PCSP_PERIOD_NS() PCSP_CALC_NS(CUR_DIV())
+
+#define PCSP_MAX_PERIOD_SIZE (64*1024)
+#define PCSP_MAX_PERIODS 512
+#define PCSP_BUFFER_SIZE (128*1024)
+
+struct snd_pcsp {
+ struct snd_card *card;
+ struct snd_pcm *pcm;
+ struct input_dev *input_dev;
+ struct hrtimer timer;
+ unsigned short port, irq, dma;
+ spinlock_t substream_lock;
+ struct snd_pcm_substream *playback_substream;
+ size_t playback_ptr;
+ size_t period_ptr;
+ atomic_t timer_active;
+ int thalf;
+ u64 ns_rem;
+ unsigned char val61;
+ int enable;
+ int max_treble;
+ int treble;
+ int pcspkr;
+};
+
+extern struct snd_pcsp pcsp_chip;
+
+extern enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle);
+
+extern int snd_pcsp_new_pcm(struct snd_pcsp *chip);
+extern int snd_pcsp_new_mixer(struct snd_pcsp *chip);
+
+#endif