2 * Copyright (c) 1998, 2001 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
29 #include <sys/param.h>
30 #include <sys/kernel.h>
31 #include <sys/systm.h>
32 #include <sys/module.h>
36 #include <sys/fcntl.h>
38 #include <dev/smbus/smbconf.h>
39 #include <dev/smbus/smbus.h>
40 #include <dev/smbus/smb.h>
44 #define SMB_OLD_READB _IOW('i', 7, struct smbcmd)
45 #define SMB_OLD_READW _IOW('i', 8, struct smbcmd)
46 #define SMB_OLD_PCALL _IOW('i', 9, struct smbcmd)
50 int sc_count; /* >0 if device opened */
51 struct cdev *sc_devnode;
55 static void smb_identify(driver_t *driver, device_t parent);
56 static int smb_probe(device_t);
57 static int smb_attach(device_t);
58 static int smb_detach(device_t);
60 static devclass_t smb_devclass;
62 static device_method_t smb_methods[] = {
63 /* device interface */
64 DEVMETHOD(device_identify, smb_identify),
65 DEVMETHOD(device_probe, smb_probe),
66 DEVMETHOD(device_attach, smb_attach),
67 DEVMETHOD(device_detach, smb_detach),
70 DEVMETHOD(smbus_intr, smbus_generic_intr),
75 static driver_t smb_driver = {
78 sizeof(struct smb_softc),
81 static d_open_t smbopen;
82 static d_close_t smbclose;
83 static d_ioctl_t smbioctl;
85 static struct cdevsw smb_cdevsw = {
86 .d_version = D_VERSION,
87 .d_flags = D_TRACKCLOSE,
95 smb_identify(driver_t *driver, device_t parent)
98 if (device_find_child(parent, "smb", -1) == NULL)
99 BUS_ADD_CHILD(parent, 0, "smb", -1);
103 smb_probe(device_t dev)
105 if (smbus_get_addr(dev) != -1)
108 device_set_desc(dev, "SMBus generic I/O");
109 return (BUS_PROBE_NOWILDCARD);
113 smb_attach(device_t dev)
115 struct smb_softc *sc = device_get_softc(dev);
118 unit = device_get_unit(dev);
121 sc->sc_devnode = make_dev(&smb_cdevsw, unit, UID_ROOT, GID_WHEEL,
122 0600, "smb%d", unit);
123 sc->sc_devnode->si_drv1 = sc;
124 mtx_init(&sc->sc_lock, device_get_nameunit(dev), NULL, MTX_DEF);
130 smb_detach(device_t dev)
132 struct smb_softc *sc = (struct smb_softc *)device_get_softc(dev);
135 destroy_dev(sc->sc_devnode);
136 mtx_destroy(&sc->sc_lock);
142 smbopen(struct cdev *dev, int flags, int fmt, struct thread *td)
144 struct smb_softc *sc = dev->si_drv1;
146 mtx_lock(&sc->sc_lock);
147 if (sc->sc_count != 0) {
148 mtx_unlock(&sc->sc_lock);
153 mtx_unlock(&sc->sc_lock);
159 smbclose(struct cdev *dev, int flags, int fmt, struct thread *td)
161 struct smb_softc *sc = dev->si_drv1;
163 mtx_lock(&sc->sc_lock);
164 KASSERT(sc->sc_count == 1, ("device not busy"));
166 mtx_unlock(&sc->sc_lock);
172 smbioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td)
174 char buf[SMB_MAXBLOCKSIZE];
176 struct smbcmd *s = (struct smbcmd *)data;
177 struct smb_softc *sc = dev->si_drv1;
178 device_t smbdev = sc->sc_dev;
184 * If a specific slave device is being used, override any passed-in
187 unit = dev2unit(dev);
189 s->slave = unit & 0x03ff;
191 parent = device_get_parent(smbdev);
193 /* Make sure that LSB bit is cleared. */
197 /* Allocate the bus. */
198 if ((error = smbus_request_bus(parent, smbdev,
199 (flags & O_NONBLOCK) ? SMB_DONTWAIT : (SMB_WAIT | SMB_INTR))))
203 case SMB_QUICK_WRITE:
204 error = smbus_error(smbus_quick(parent, s->slave, SMB_QWRITE));
208 error = smbus_error(smbus_quick(parent, s->slave, SMB_QREAD));
212 error = smbus_error(smbus_sendb(parent, s->slave, s->cmd));
216 error = smbus_error(smbus_recvb(parent, s->slave, &s->cmd));
220 error = smbus_error(smbus_writeb(parent, s->slave, s->cmd,
225 error = smbus_error(smbus_writew(parent, s->slave,
226 s->cmd, s->wdata.word));
231 /* NB: for SMB_OLD_READB the read data goes to rbuf only. */
232 error = smbus_error(smbus_readb(parent, s->slave, s->cmd,
236 if (s->rbuf && s->rcount >= 1) {
237 error = copyout(&s->rdata.byte, s->rbuf, 1);
244 /* NB: for SMB_OLD_READW the read data goes to rbuf only. */
245 error = smbus_error(smbus_readw(parent, s->slave, s->cmd,
249 if (s->rbuf && s->rcount >= 2) {
250 buf[0] = (u_char)s->rdata.word;
251 buf[1] = (u_char)(s->rdata.word >> 8);
252 error = copyout(buf, s->rbuf, 2);
259 /* NB: for SMB_OLD_PCALL the read data goes to rbuf only. */
260 error = smbus_error(smbus_pcall(parent, s->slave, s->cmd,
261 s->wdata.word, &s->rdata.word));
264 if (s->rbuf && s->rcount >= 2) {
265 buf[0] = (u_char)s->rdata.word;
266 buf[1] = (u_char)(s->rdata.word >> 8);
267 error = copyout(buf, s->rbuf, 2);
278 if (s->wcount > SMB_MAXBLOCKSIZE)
279 s->wcount = SMB_MAXBLOCKSIZE;
281 error = copyin(s->wbuf, buf, s->wcount);
284 error = smbus_error(smbus_bwrite(parent, s->slave, s->cmd,
293 if (s->rcount > SMB_MAXBLOCKSIZE)
294 s->rcount = SMB_MAXBLOCKSIZE;
295 error = smbus_error(smbus_bread(parent, s->slave, s->cmd,
299 if (s->rcount > bcount)
301 error = copyout(buf, s->rbuf, s->rcount);
308 smbus_release_bus(parent, smbdev);
313 DRIVER_MODULE(smb, smbus, smb_driver, smb_devclass, 0, 0);
314 MODULE_DEPEND(smb, smbus, SMBUS_MINVER, SMBUS_PREFVER, SMBUS_MAXVER);
315 MODULE_VERSION(smb, 1);