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 1.10 2006/09/10 01:26:32 dillon 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 dev_ops iic_ops = {
97 { "iic", CDEV_MAJOR, 0 },
109 iic_probe(device_t dev)
111 struct iic_softc *sc = (struct iic_softc *)device_get_softc(dev);
113 sc->sc_addr = iicbus_get_addr(dev);
115 /* XXX detect chip with start/stop conditions */
124 iic_attach(device_t dev)
126 make_dev(&iic_ops, device_get_unit(dev), /* XXX cleanup */
128 0600, "iic%d", device_get_unit(dev));
133 iicopen (struct dev_open_args *ap)
135 cdev_t dev = ap->a_head.a_dev;
136 struct iic_softc *sc = IIC_SOFTC(minor(dev));
141 if (sc->sc_count > 0)
150 iicclose(struct dev_close_args *ap)
152 cdev_t dev = ap->a_head.a_dev;
153 struct iic_softc *sc = IIC_SOFTC(minor(dev));
163 if (sc->sc_count < 0)
164 panic("%s: iic_count < 0!", __func__);
170 iicwrite(struct dev_write_args *ap)
172 cdev_t dev = ap->a_head.a_dev;
173 struct uio *uio = ap->a_uio;
174 device_t iicdev = IIC_DEVICE(minor(dev));
175 struct iic_softc *sc = IIC_SOFTC(minor(dev));
176 int sent, error, count;
181 if (sc->sc_count == 0)
184 if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT)))
187 count = (int)szmin(uio->uio_resid, BUFSIZE);
188 uiomove(sc->sc_buffer, (size_t)count, uio);
190 error = iicbus_block_write(device_get_parent(iicdev), sc->sc_addr,
191 sc->sc_buffer, count, &sent);
193 iicbus_release_bus(device_get_parent(iicdev), iicdev);
199 iicread(struct dev_read_args *ap)
201 cdev_t dev = ap->a_head.a_dev;
202 struct uio *uio = ap->a_uio;
203 device_t iicdev = IIC_DEVICE(minor(dev));
204 struct iic_softc *sc = IIC_SOFTC(minor(dev));
211 if (sc->sc_count == 0)
214 if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT)))
217 /* max amount of data to read */
218 len = (int)szmin(uio->uio_resid, BUFSIZE);
220 if ((error = iicbus_block_read(device_get_parent(iicdev), sc->sc_addr,
221 sc->sc_inbuf, len, &bufsize)))
224 if (bufsize > uio->uio_resid)
225 panic("%s: too much data read!", __func__);
227 iicbus_release_bus(device_get_parent(iicdev), iicdev);
229 return (uiomove(sc->sc_inbuf, (size_t)bufsize, uio));
233 iicioctl(struct dev_ioctl_args *ap)
235 cdev_t dev = ap->a_head.a_dev;
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 *)ap->a_data;
245 if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev,
246 (ap->a_fflag & 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);