2 * Copyright (c) 1998 Nicolas Souchu
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * $FreeBSD: src/sys/dev/iicbus/iic.c,v 1.18 1999/11/18 05:43:32 peter Exp $
29 #include <sys/param.h>
30 #include <sys/kernel.h>
31 #include <sys/systm.h>
32 #include <sys/module.h>
37 #include <sys/malloc.h>
38 #include <sys/fcntl.h>
40 #include <machine/clock.h>
42 #include <dev/iicbus/iiconf.h>
43 #include <dev/iicbus/iicbus.h>
45 #include <machine/iic.h>
47 #include "iicbus_if.h"
53 u_char sc_addr; /* address on iicbus */
54 int sc_count; /* >0 if device opened */
56 char sc_buffer[BUFSIZE]; /* output buffer */
57 char sc_inbuf[BUFSIZE]; /* input buffer */
60 #define IIC_SOFTC(unit) \
61 ((struct iic_softc *)devclass_get_softc(iic_devclass, (unit)))
63 #define IIC_DEVICE(unit) \
64 (devclass_get_device(iic_devclass, (unit)))
66 static int iic_probe(device_t);
67 static int iic_attach(device_t);
69 static devclass_t iic_devclass;
71 static device_method_t iic_methods[] = {
72 /* device interface */
73 DEVMETHOD(device_probe, iic_probe),
74 DEVMETHOD(device_attach, iic_attach),
76 /* iicbus interface */
77 DEVMETHOD(iicbus_intr, iicbus_generic_intr),
82 static driver_t iic_driver = {
85 sizeof(struct iic_softc),
88 static d_open_t iicopen;
89 static d_close_t iicclose;
90 static d_write_t iicwrite;
91 static d_read_t iicread;
92 static d_ioctl_t iicioctl;
94 #define CDEV_MAJOR 105
95 static struct cdevsw iic_cdevsw = {
100 /* ioctl */ iicioctl,
103 /* strategy */ nostrategy,
105 /* maj */ CDEV_MAJOR,
116 iic_probe(device_t dev)
118 struct iic_softc *sc = (struct iic_softc *)device_get_softc(dev);
120 sc->sc_addr = iicbus_get_addr(dev);
122 /* XXX detect chip with start/stop conditions */
131 iic_attach(device_t dev)
133 make_dev(&iic_cdevsw, device_get_unit(dev), /* XXX cleanup */
135 0600, "iic%d", device_get_unit(dev));
140 iicopen (dev_t dev, int flags, int fmt, struct proc *p)
142 struct iic_softc *sc = IIC_SOFTC(minor(dev));
147 if (sc->sc_count > 0)
156 iicclose(dev_t dev, int flags, int fmt, struct proc *p)
158 struct iic_softc *sc = IIC_SOFTC(minor(dev));
168 if (sc->sc_count < 0)
169 panic("%s: iic_count < 0!", __FUNCTION__);
175 iicwrite(dev_t dev, struct uio * uio, int ioflag)
177 device_t iicdev = IIC_DEVICE(minor(dev));
178 struct iic_softc *sc = IIC_SOFTC(minor(dev));
179 int sent, error, count;
184 if (sc->sc_count == 0)
187 if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT)))
190 count = min(uio->uio_resid, BUFSIZE);
191 uiomove(sc->sc_buffer, count, uio);
193 error = iicbus_block_write(device_get_parent(iicdev), sc->sc_addr,
194 sc->sc_buffer, count, &sent);
196 iicbus_release_bus(device_get_parent(iicdev), iicdev);
202 iicread(dev_t dev, struct uio * uio, int ioflag)
204 device_t iicdev = IIC_DEVICE(minor(dev));
205 struct iic_softc *sc = IIC_SOFTC(minor(dev));
212 if (sc->sc_count == 0)
215 if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT)))
218 /* max amount of data to read */
219 len = min(uio->uio_resid, BUFSIZE);
221 if ((error = iicbus_block_read(device_get_parent(iicdev), sc->sc_addr,
222 sc->sc_inbuf, len, &bufsize)))
225 if (bufsize > uio->uio_resid)
226 panic("%s: too much data read!", __FUNCTION__);
228 iicbus_release_bus(device_get_parent(iicdev), iicdev);
230 return (uiomove(sc->sc_inbuf, bufsize, uio));
234 iicioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p)
236 device_t iicdev = IIC_DEVICE(minor(dev));
237 struct iic_softc *sc = IIC_SOFTC(minor(dev));
238 device_t parent = device_get_parent(iicdev);
239 struct iiccmd *s = (struct iiccmd *)data;
245 if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev,
246 (flags & O_NONBLOCK) ? IIC_DONTWAIT :
247 (IIC_WAIT | IIC_INTR))))
252 error = iicbus_start(parent, s->slave, 0);
256 error = iicbus_stop(parent);
260 error = iicbus_reset(parent, 0, 0, NULL);
264 error = iicbus_write(parent, s->buf, s->count, &count, 0);
268 error = iicbus_read(parent, s->buf, s->count, &count, s->last, 0);
275 iicbus_release_bus(device_get_parent(iicdev), iicdev);
280 DRIVER_MODULE(iic, iicbus, iic_driver, iic_devclass, 0, 0);