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 $
27 * $DragonFly: src/sys/bus/iicbus/iic.c,v 1.8 2005/02/17 13:59:35 joerg Exp $
30 #include <sys/param.h>
31 #include <sys/kernel.h>
32 #include <sys/systm.h>
33 #include <sys/module.h>
38 #include <sys/malloc.h>
39 #include <sys/fcntl.h>
41 #include <machine/clock.h>
46 #include <machine/iic.h>
48 #include "iicbus_if.h"
54 u_char sc_addr; /* address on iicbus */
55 int sc_count; /* >0 if device opened */
57 char sc_buffer[BUFSIZE]; /* output buffer */
58 char sc_inbuf[BUFSIZE]; /* input buffer */
61 #define IIC_SOFTC(unit) \
62 ((struct iic_softc *)devclass_get_softc(iic_devclass, (unit)))
64 #define IIC_DEVICE(unit) \
65 (devclass_get_device(iic_devclass, (unit)))
67 static int iic_probe(device_t);
68 static int iic_attach(device_t);
70 static devclass_t iic_devclass;
72 static device_method_t iic_methods[] = {
73 /* device interface */
74 DEVMETHOD(device_probe, iic_probe),
75 DEVMETHOD(device_attach, iic_attach),
77 /* iicbus interface */
78 DEVMETHOD(iicbus_intr, iicbus_generic_intr),
83 static driver_t iic_driver = {
86 sizeof(struct iic_softc),
89 static d_open_t iicopen;
90 static d_close_t iicclose;
91 static d_write_t iicwrite;
92 static d_read_t iicread;
93 static d_ioctl_t iicioctl;
95 #define CDEV_MAJOR 105
96 static struct cdevsw iic_cdevsw = {
104 /* close */ iicclose,
106 /* write */ iicwrite,
107 /* ioctl */ iicioctl,
110 /* strategy */ nostrategy,
119 iic_probe(device_t dev)
121 struct iic_softc *sc = (struct iic_softc *)device_get_softc(dev);
123 sc->sc_addr = iicbus_get_addr(dev);
125 /* XXX detect chip with start/stop conditions */
134 iic_attach(device_t dev)
136 cdevsw_add(&iic_cdevsw, -1, device_get_unit(dev));
137 make_dev(&iic_cdevsw, device_get_unit(dev), /* XXX cleanup */
139 0600, "iic%d", device_get_unit(dev));
144 iicopen (dev_t dev, int flags, int fmt, struct thread *td)
146 struct iic_softc *sc = IIC_SOFTC(minor(dev));
151 if (sc->sc_count > 0)
160 iicclose(dev_t dev, int flags, int fmt, struct thread *td)
162 struct iic_softc *sc = IIC_SOFTC(minor(dev));
172 if (sc->sc_count < 0)
173 panic("%s: iic_count < 0!", __func__);
179 iicwrite(dev_t dev, struct uio * uio, int ioflag)
181 device_t iicdev = IIC_DEVICE(minor(dev));
182 struct iic_softc *sc = IIC_SOFTC(minor(dev));
183 int sent, error, count;
188 if (sc->sc_count == 0)
191 if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT)))
194 count = min(uio->uio_resid, BUFSIZE);
195 uiomove(sc->sc_buffer, count, uio);
197 error = iicbus_block_write(device_get_parent(iicdev), sc->sc_addr,
198 sc->sc_buffer, count, &sent);
200 iicbus_release_bus(device_get_parent(iicdev), iicdev);
206 iicread(dev_t dev, struct uio * uio, int ioflag)
208 device_t iicdev = IIC_DEVICE(minor(dev));
209 struct iic_softc *sc = IIC_SOFTC(minor(dev));
216 if (sc->sc_count == 0)
219 if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT)))
222 /* max amount of data to read */
223 len = min(uio->uio_resid, BUFSIZE);
225 if ((error = iicbus_block_read(device_get_parent(iicdev), sc->sc_addr,
226 sc->sc_inbuf, len, &bufsize)))
229 if (bufsize > uio->uio_resid)
230 panic("%s: too much data read!", __func__);
232 iicbus_release_bus(device_get_parent(iicdev), iicdev);
234 return (uiomove(sc->sc_inbuf, bufsize, uio));
238 iicioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct thread *td)
240 device_t iicdev = IIC_DEVICE(minor(dev));
241 struct iic_softc *sc = IIC_SOFTC(minor(dev));
242 device_t parent = device_get_parent(iicdev);
243 struct iiccmd *s = (struct iiccmd *)data;
249 if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev,
250 (flags & O_NONBLOCK) ? IIC_DONTWAIT :
251 (IIC_WAIT | IIC_INTR))))
256 error = iicbus_start(parent, s->slave, 0);
260 error = iicbus_stop(parent);
264 error = iicbus_reset(parent, 0, 0, NULL);
268 error = iicbus_write(parent, s->buf, s->count, &count, 0);
272 error = iicbus_read(parent, s->buf, s->count, &count, s->last, 0);
279 iicbus_release_bus(device_get_parent(iicdev), iicdev);
284 DRIVER_MODULE(iic, iicbus, iic_driver, iic_devclass, 0, 0);