From: Alan Cox <alan@linux.intel.com>
Date: Tue, 31 Mar 2015 21:50:15 +0000 (+0100)
Subject: audio: first draft of an audio header and ioctl interface
X-Git-Url: https://git.ndcode.org/public/gitweb.cgi?a=commitdiff_plain;h=1f65b8db3b698305f8e6a37d8040449b29509fc8;p=FUZIX.git

audio: first draft of an audio header and ioctl interface
---

diff --git a/Kernel/include/audio.h b/Kernel/include/audio.h
new file mode 100644
index 00000000..d1bd1146
--- /dev/null
+++ b/Kernel/include/audio.h
@@ -0,0 +1,54 @@
+#ifndef _AUDIO_H
+#define _AUDIO_H
+
+struct sound {
+  uint8_t channel;
+  uint8_t time;				/* 1/10th second */
+  uint16_t freq;			/* Hz */
+  uint8_t flags;
+#define SND_NOISE_ON	1		/* Enable noise on this channel */
+#define SND_WAIT	2		/* Wait for existing sound */
+  uint8_t volume;
+  uint16_t envclock;			/* Hz */
+  uint8_t adsrtime[4];			/* in env clocks */
+  uint8_t adsrvol[4];			/* volume ramps */
+};
+
+
+struct audio {
+  uint8_t type;
+#define AUDIO_BEEPER		1	/* Generic beeper */
+#define AUDIO_CLICK		2	/* One bit speaker control */
+#define AUDIO_AY38910		128	/* And 39811/2/etc */
+#define AUDIO_SN76489		129
+  uint8_t channels;
+  uint16_t flags;
+#define SND_DIRECT_IO		1	/* Has ioctls for direct register I/O */
+#define SND_ENVELOPE		2	/* Allows envelopes */
+#define SND_NOISE		4	/* Allows noise */
+#define SND_SAMPLE		8	/* Supports sample playback */
+#define SND_SOFT_SAMPLE		16	/* Sample playback is software (slow) */
+#define SND_MASTER_VOLUME	32	/* Has a master volume knob */
+};
+
+
+#define AUDIOC_GETINFO		0x0200	/* Query audio features */
+#define AUDIOC_PLAY		0x0201	/* Play a sound */
+#define AUDIOC_VOLUME		0x0202	/* Master volume adjust if present */
+#define AUDIOC_STOP		0x0203	/* Stop any playing sound */
+#define AUDIOC_WAIT		0x0204	/* Wait for existing sound */
+
+/* Provided by the device layer */
+extern const struct audio audio_info;
+extern void devaudio_stop(uint8_t channel);
+extern int devaudio_wait(uint8_t channel);
+extern int devaudio_play(void);
+extern int devaudio_ioctl(uarg_t op, void *val);
+extern void devaudio_tick(void);
+
+/* Provided by the audio core */
+extern int audio_ioctl(uarg_t op, void *val);
+extern struct sound sound;
+extern void audio_tick(void);	/* Every 1/10th a second */
+
+#endif