280 lines
6.4 KiB
C
280 lines
6.4 KiB
C
/* $NetBSD: mpu.c,v 1.5 2001/11/13 13:14:41 lukem Exp $ */
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/*
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* Copyright (c) 1998 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Lennart Augustsson (augustss@netbsd.org).
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: mpu.c,v 1.5 2001/11/13 13:14:41 lukem Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/errno.h>
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#include <sys/ioctl.h>
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#include <sys/syslog.h>
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#include <sys/device.h>
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#include <sys/proc.h>
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#include <sys/buf.h>
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#include <machine/cpu.h>
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#include <machine/intr.h>
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#include <machine/bus.h>
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#include <dev/midi_if.h>
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#include <dev/ic/mpuvar.h>
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#ifdef AUDIO_DEBUG
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#define DPRINTF(x) if (mpudebug) printf x
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#define DPRINTFN(n,x) if (mpudebug >= (n)) printf x
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int mpudebug = 0;
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#else
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#define DPRINTF(x)
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#define DPRINTFN(n,x)
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#endif
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#define MPU_DATA 0
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#define MPU_COMMAND 1
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#define MPU_RESET 0xff
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#define MPU_UART_MODE 0x3f
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#define MPU_ACK 0xfe
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#define MPU_STATUS 1
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#define MPU_OUTPUT_BUSY 0x40
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#define MPU_INPUT_EMPTY 0x80
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#define MPU_MAXWAIT 10000 /* usec/10 to wait */
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#define MPU_GETSTATUS(iot, ioh) (bus_space_read_1(iot, ioh, MPU_STATUS))
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int mpu_reset(struct mpu_softc *);
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static __inline int mpu_waitready(struct mpu_softc *);
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void mpu_readinput(struct mpu_softc *);
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int mpu_open __P((void *, int,
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void (*iintr)__P((void *, int)),
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void (*ointr)__P((void *)), void *arg));
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void mpu_close __P((void *));
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int mpu_output __P((void *, int));
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void mpu_getinfo __P((void *, struct midi_info *));
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struct midi_hw_if mpu_midi_hw_if = {
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mpu_open,
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mpu_close,
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mpu_output,
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mpu_getinfo,
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0, /* ioctl */
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};
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int
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mpu_find(sc)
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struct mpu_softc *sc;
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{
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if (MPU_GETSTATUS(sc->iot, sc->ioh) == 0xff) {
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DPRINTF(("mpu_find: No status\n"));
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goto bad;
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}
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sc->open = 0;
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sc->intr = 0;
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if (mpu_reset(sc) == 0)
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return 1;
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bad:
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return 0;
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}
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void
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mpu_attach(sc)
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struct mpu_softc *sc;
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{
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printf("\n");
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midi_attach_mi(&mpu_midi_hw_if, sc, &sc->sc_dev);
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}
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static __inline int
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mpu_waitready(sc)
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struct mpu_softc *sc;
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{
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int i;
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for(i = 0; i < MPU_MAXWAIT; i++) {
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if (!(MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_OUTPUT_BUSY))
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return 0;
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delay(10);
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}
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return 1;
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}
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int
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mpu_reset(sc)
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struct mpu_softc *sc;
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{
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bus_space_tag_t iot = sc->iot;
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bus_space_handle_t ioh = sc->ioh;
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int i;
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int s;
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if (mpu_waitready(sc)) {
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DPRINTF(("mpu_reset: not ready\n"));
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return EIO;
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}
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s = splaudio(); /* Don't let the interrupt get our ACK. */
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bus_space_write_1(iot, ioh, MPU_COMMAND, MPU_RESET);
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for(i = 0; i < 2*MPU_MAXWAIT; i++) {
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if (!(MPU_GETSTATUS(iot, ioh) & MPU_INPUT_EMPTY) &&
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bus_space_read_1(iot, ioh, MPU_DATA) == MPU_ACK) {
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splx(s);
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return 0;
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}
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}
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splx(s);
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DPRINTF(("mpu_reset: No ACK\n"));
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return EIO;
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}
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int
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mpu_open(addr, flags, iintr, ointr, arg)
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void *addr;
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int flags;
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void (*iintr)__P((void *, int));
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void (*ointr)__P((void *));
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void *arg;
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{
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struct mpu_softc *sc = addr;
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DPRINTF(("mpu_open: sc=%p\n", sc));
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if (sc->open)
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return EBUSY;
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#ifndef AUDIO_NO_POWER_CTL
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if (sc->powerctl)
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sc->powerctl(sc->powerarg, 1);
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#endif
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if (mpu_reset(sc) != 0) {
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#ifndef AUDIO_NO_POWER_CTL
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if (sc->powerctl)
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sc->powerctl(sc->powerarg, 0);
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#endif
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return EIO;
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}
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bus_space_write_1(sc->iot, sc->ioh, MPU_COMMAND, MPU_UART_MODE);
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sc->open = 1;
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sc->intr = iintr;
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sc->arg = arg;
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return 0;
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}
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void
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mpu_close(addr)
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void *addr;
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{
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struct mpu_softc *sc = addr;
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DPRINTF(("mpu_close: sc=%p\n", sc));
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sc->open = 0;
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sc->intr = 0;
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mpu_reset(sc); /* exit UART mode */
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#ifndef AUDIO_NO_POWER_CTL
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if (sc->powerctl)
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sc->powerctl(sc->powerarg, 0);
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#endif
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}
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void
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mpu_readinput(sc)
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struct mpu_softc *sc;
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{
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bus_space_tag_t iot = sc->iot;
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bus_space_handle_t ioh = sc->ioh;
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int data;
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while(!(MPU_GETSTATUS(iot, ioh) & MPU_INPUT_EMPTY)) {
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data = bus_space_read_1(iot, ioh, MPU_DATA);
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DPRINTFN(3, ("mpu_rea: sc=%p 0x%02x\n", sc, data));
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if (sc->intr)
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sc->intr(sc->arg, data);
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}
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}
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int
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mpu_output(addr, d)
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void *addr;
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int d;
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{
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struct mpu_softc *sc = addr;
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int s;
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DPRINTFN(3, ("mpu_output: sc=%p 0x%02x\n", sc, d));
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if (!(MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_INPUT_EMPTY)) {
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s = splaudio();
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mpu_readinput(sc);
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splx(s);
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}
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if (mpu_waitready(sc)) {
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DPRINTF(("mpu_output: not ready\n"));
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return EIO;
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}
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bus_space_write_1(sc->iot, sc->ioh, MPU_DATA, d);
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return 0;
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}
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void
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mpu_getinfo(addr, mi)
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void *addr;
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struct midi_info *mi;
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{
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struct mpu_softc *sc = addr;
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mi->name = sc->model;
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mi->props = 0;
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}
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int
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mpu_intr(addr)
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void *addr;
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{
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struct mpu_softc *sc = addr;
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if (MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_INPUT_EMPTY) {
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DPRINTF(("mpu_intr: no data\n"));
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return (0);
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} else {
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mpu_readinput(sc);
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return (1);
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}
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}
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