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/smbus/smb.c,v 1.20 1999/11/18 05:44:56 peter Exp $
27 * $DragonFly: src/sys/bus/smbus/smb.c,v 1.9 2006/09/10 01:26:33 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>
45 #include <machine/smb.h>
53 int sc_addr; /* address on smbus */
54 int sc_count; /* >0 if device opened */
56 char *sc_cp; /* output buffer pointer */
58 char sc_buffer[BUFSIZE]; /* output buffer */
59 char sc_inbuf[BUFSIZE]; /* input buffer */
62 #define IIC_SOFTC(unit) \
63 ((struct smb_softc *)devclass_get_softc(smb_devclass, (unit)))
65 #define IIC_DEVICE(unit) \
66 (devclass_get_device(smb_devclass, (unit)))
68 static int smb_probe(device_t);
69 static int smb_attach(device_t);
71 static devclass_t smb_devclass;
73 static device_method_t smb_methods[] = {
74 /* device interface */
75 DEVMETHOD(device_probe, smb_probe),
76 DEVMETHOD(device_attach, smb_attach),
79 DEVMETHOD(smbus_intr, smbus_generic_intr),
84 static driver_t smb_driver = {
87 sizeof(struct smb_softc),
90 static d_open_t smbopen;
91 static d_close_t smbclose;
92 static d_write_t smbwrite;
93 static d_read_t smbread;
94 static d_ioctl_t smbioctl;
96 #define CDEV_MAJOR 106
97 static struct dev_ops smb_ops = {
98 { "smb", CDEV_MAJOR, 0 },
110 smb_probe(device_t dev)
112 struct smb_softc *sc = (struct smb_softc *)device_get_softc(dev);
114 sc->sc_addr = smbus_get_addr(dev);
116 /* XXX detect chip with start/stop conditions */
125 smb_attach(device_t dev)
127 make_dev(&smb_ops, device_get_unit(dev),
129 0600, "smb%d", device_get_unit(dev));
134 smbopen (struct dev_open_args *ap)
136 cdev_t dev = ap->a_head.a_dev;
137 struct smb_softc *sc = IIC_SOFTC(minor(dev));
151 smbclose(struct dev_close_args *ap)
153 cdev_t dev = ap->a_head.a_dev;
154 struct smb_softc *sc = IIC_SOFTC(minor(dev));
168 smbwrite(struct dev_write_args *ap)
174 smbread(struct dev_read_args *ap)
180 smbioctl(struct dev_ioctl_args *ap)
182 cdev_t dev = ap->a_head.a_dev;
183 device_t smbdev = IIC_DEVICE(minor(dev));
184 struct smb_softc *sc = IIC_SOFTC(minor(dev));
185 device_t parent = device_get_parent(smbdev);
188 struct smbcmd *s = (struct smbcmd *)ap->a_data;
193 /* allocate the bus */
194 if ((error = smbus_request_bus(parent, smbdev,
195 (ap->a_fflag & O_NONBLOCK) ? SMB_DONTWAIT : (SMB_WAIT | SMB_INTR))))
199 case SMB_QUICK_WRITE:
200 error = smbus_error(smbus_quick(parent, s->slave, SMB_QWRITE));
204 error = smbus_error(smbus_quick(parent, s->slave, SMB_QREAD));
208 error = smbus_error(smbus_sendb(parent, s->slave, s->cmd));
212 error = smbus_error(smbus_recvb(parent, s->slave, &s->cmd));
216 error = smbus_error(smbus_writeb(parent, s->slave, s->cmd,
221 error = smbus_error(smbus_writew(parent, s->slave,
222 s->cmd, s->data.word));
226 if (s->data.byte_ptr)
227 error = smbus_error(smbus_readb(parent, s->slave,
228 s->cmd, s->data.byte_ptr));
232 if (s->data.word_ptr)
233 error = smbus_error(smbus_readw(parent, s->slave,
234 s->cmd, s->data.word_ptr));
238 if (s->data.process.rdata)
239 error = smbus_error(smbus_pcall(parent, s->slave, s->cmd,
240 s->data.process.sdata, s->data.process.rdata));
244 if (s->count && s->data.byte_ptr)
245 error = smbus_error(smbus_bwrite(parent, s->slave,
246 s->cmd, s->count, s->data.byte_ptr));
250 if (s->count && s->data.byte_ptr)
251 error = smbus_error(smbus_bread(parent, s->slave,
252 s->cmd, s->count, s->data.byte_ptr));
259 /* release the bus */
260 smbus_release_bus(parent, smbdev);
265 DRIVER_MODULE(smb, smbus, smb_driver, smb_devclass, 0, 0);