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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /sound/drivers/pcsp/pcsp.h
Initial import
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 000000000..fc7a2dc41
--- /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>
+#include <linux/i8253.h>
+#include <linux/timex.h>
+
+#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 CALC_DIV(d) (MAX_DIV >> (d))
+#define CUR_DIV() CALC_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_CALC_RATE(i) (PIT_TICK_RATE / CALC_DIV(i))
+#define PCSP_RATE() PCSP_CALC_RATE(chip->treble)
+#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;
+ unsigned int fmt_size;
+ unsigned int is_signed;
+ 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 void pcsp_sync_stop(struct snd_pcsp *chip);
+
+extern int snd_pcsp_new_pcm(struct snd_pcsp *chip);
+extern int snd_pcsp_new_mixer(struct snd_pcsp *chip, int nopcm);
+
+#endif