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/*
* Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <sys/timer.h>
#include <sys/errno.h>
#include <machine/isa/spkr.h>
#include <machine/isa/i8254.h>
#include <machine/io.h>
#define DIVIDEND 1193180
#define CTRL_PORT 0x61
int
pcspkr_tone(uint16_t freq, uint32_t msec)
{
uint32_t divisor;
uint8_t tmp;
struct timer tmr;
if (req_timer(TIMER_GP, &tmr) != TMRR_SUCCESS)
return -ENOTSUP;
if (__unlikely(tmr.msleep == NULL))
return -ENOTSUP;
divisor = DIVIDEND / freq;
outb(i8254_COMMAND, 0xB6);
outb(i8254_CHANNEL_2, divisor & 0xFF);
outb(i8254_CHANNEL_2, (divisor >> 8) & 0xFF);
/* Oscillate the speaker */
tmp = inb(CTRL_PORT);
if (!__TEST(tmp, 3)) {
tmp |= 3;
outb(CTRL_PORT, tmp);
}
/* Sleep then turn off the speaker */
tmr.msleep(msec);
outb(CTRL_PORT, tmp & ~3);
return 0;
}
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