root / prex-0.9.0 / bsp / drv / dev / input / psaux.c @ 03e9c04a
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/*-
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* Copyright (c) 2005-2009, Kohsuke Ohtani
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* All rights reserved.
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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. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* psaux.c - ps2 mouse support
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*/
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/*
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* PS/2 mouse packet
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*
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* Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
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* ------ ------ ------ ------ ------ ----- ------ ------ ------
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* Byte 1 Yovf Xovf Ysign Xsign 1 MidBtn RgtBtn LftBtn
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* Byte 2 X movement
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* Byte 3 Y movement
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*/
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#include <driver.h> |
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#include "i8042.h" |
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/* #define DEBUG_MOUSE 1 */
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#ifdef DEBUG_MOUSE
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#define DPRINTF(a) printf a
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#else
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#define DPRINTF(a)
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#endif
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#define MOUSE_IRQ 12 |
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struct psaux_softc {
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device_t dev; /* device object */
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irq_t irq; /* handle for mouse irq */
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u_char packet[3]; /* mouse packet */ |
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int index;
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}; |
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static int psaux_init(struct driver *); |
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static int psaux_open(device_t, int); |
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static int psaux_close(device_t); |
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static int psaux_read(device_t, char *, size_t *, int); |
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static struct devops psaux_devops = { |
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/* open */ psaux_open,
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/* close */ psaux_close,
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/* read */ psaux_read,
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/* write */ no_write,
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/* ioctl */ no_ioctl,
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/* devctl */ no_devctl,
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}; |
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struct driver psaux_driver = {
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/* name */ "psaux", |
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/* devops */ &psaux_devops,
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/* devsz */ sizeof(struct psaux_softc), |
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/* flags */ 0, |
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/* probe */ NULL, |
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/* init */ psaux_init,
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/* shutdown */ NULL, |
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}; |
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/*
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* Write aux device command
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*/
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static void |
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kmc_send_auxcmd(u_char val) |
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{ |
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DPRINTF(("kmc_send_auxcmd: %x\n", val));
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kmc_wait_ibe(); |
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bus_write_8(KMC_CMD, 0x60);
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kmc_wait_ibe(); |
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bus_write_8(KMC_DATA, val); |
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} |
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/*
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* Returns 0 on success, -1 on failure.
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*/
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static int |
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kmc_write_aux(u_char val) |
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{ |
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int rc = -1; |
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int s;
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DPRINTF(("kmc_write_aux: val=%x\n", val));
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s = splhigh(); |
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/* Write the value to the device */
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kmc_wait_ibe(); |
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bus_write_8(KMC_CMD, 0xd4);
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kmc_wait_ibe(); |
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bus_write_8(KMC_DATA, val); |
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/* Get the ack */
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kmc_wait_obf(); |
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if ((bus_read_8(KMC_STS) & 0x20) == 0x20) { |
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if (bus_read_8(KMC_DATA) == 0xfa) |
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rc = 0;
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} |
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splx(s); |
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#ifdef DEBUG_MOUSE
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if (rc)
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printf("kmc_write_aux: error val=%x\n", val);
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#endif
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return rc;
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} |
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/*
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* Interrupt handler
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*/
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static int |
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psaux_isr(void *arg)
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{ |
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struct psaux_softc *sc = arg;
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u_char dat, id; |
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if ((bus_read_8(KMC_STS) & 0x21) != 0x21) |
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return 0; |
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dat = bus_read_8(KMC_DATA); |
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if (dat == 0xaa) { /* BAT comp (reconnect) ? */ |
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DPRINTF(("BAT comp"));
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sc->index = 0;
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kmc_wait_obf(); |
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if ((bus_read_8(KMC_STS) & 0x20) == 0x20) { |
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id = bus_read_8(KMC_DATA); |
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DPRINTF(("Mouse ID=%x\n", id));
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} |
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kmc_write_aux(0xf4); /* Enable aux device */ |
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return 0; |
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} |
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sc->packet[sc->index++] = dat; |
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if (sc->index < 3) |
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return 0; |
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sc->index = 0;
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DPRINTF(("mouse packet %x:%d:%d\n", sc->packet[0], |
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sc->packet[1], sc->packet[2])); |
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return 0; |
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} |
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/*
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* Open
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*/
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static int |
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psaux_open(device_t dev, int mode)
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{ |
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DPRINTF(("psaux_open: dev=%x\n", dev));
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return 0; |
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} |
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/*
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* Close
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*/
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static int |
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psaux_close(device_t dev) |
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{ |
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DPRINTF(("psaux_close: dev=%x\n", dev));
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return 0; |
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} |
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/*
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* Read
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*/
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static int |
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psaux_read(device_t dev, char *buf, size_t *nbyte, int blkno) |
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{ |
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return 0; |
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} |
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static int |
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psaux_init(struct driver *self)
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{ |
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struct psaux_softc *sc;
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device_t dev; |
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#ifdef DEBUG
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printf("Mouse sampling rate=100 samples/sec\n");
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#endif
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dev = device_create(self, "mouse", D_CHR);
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sc = device_private(dev); |
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sc->dev = dev; |
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sc->index = 0;
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/* Allocate IRQ */
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sc->irq = irq_attach(MOUSE_IRQ, IPL_INPUT, 0, psaux_isr,
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IST_NONE, sc); |
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kmc_wait_ibe(); |
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bus_write_8(KMC_CMD, 0xa8); /* Enable aux */ |
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kmc_write_aux(0xf3); /* Set sample rate */ |
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kmc_write_aux(100); /* 100 samples/sec */ |
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kmc_write_aux(0xe8); /* Set resolution */ |
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kmc_write_aux(3); /* 8 counts per mm */ |
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kmc_write_aux(0xe7); /* 2:1 scaling */ |
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kmc_write_aux(0xf4); /* Enable aux device */ |
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kmc_send_auxcmd(0x47); /* Enable controller ints */ |
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return 0; |
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} |