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/cdefs.h>
30 __FBSDID("$FreeBSD$");
31 #include <sys/param.h>
32 #include <sys/systm.h>
34 #include <sys/module.h>
35 #include <sys/mutex.h>
38 #include <dev/smbus/smbconf.h>
39 #include <dev/smbus/smbus.h>
46 smbus_intr(device_t bus, u_char devaddr, char low, char high, int error)
48 struct smbus_softc *sc = device_get_softc(bus);
50 /* call owner's intr routine */
53 SMBUS_INTR(sc->owner, devaddr, low, high, error);
54 mtx_unlock(&sc->lock);
60 * Converts an smbus error to a unix error.
63 smbus_error(int smb_error)
67 if (smb_error == SMB_ENOERR)
70 if (smb_error & (SMB_ENOTSUPP))
72 else if (smb_error & (SMB_ENOACK))
74 else if (smb_error & (SMB_ETIMEOUT))
76 else if (smb_error & (SMB_EBUSY))
78 else if (smb_error & (SMB_EABORT | SMB_EBUSERR | SMB_ECOLLI))
87 smbus_poll(struct smbus_softc *sc, int how)
92 case SMB_WAIT | SMB_INTR:
93 error = msleep(sc, &sc->lock, SMBPRI|PCATCH, "smbreq", 0);
96 case SMB_WAIT | SMB_NOINTR:
97 error = msleep(sc, &sc->lock, SMBPRI, "smbreq", 0);
109 * smbus_request_bus()
111 * Allocate the device to perform transfers.
113 * how : SMB_WAIT or SMB_DONTWAIT
116 smbus_request_bus(device_t bus, device_t dev, int how)
118 struct smbus_softc *sc = device_get_softc(bus);
122 /* first, ask the underlying layers if the request is ok */
123 parent = device_get_parent(bus);
126 mtx_unlock(&sc->lock);
127 error = SMBUS_CALLBACK(parent, SMB_REQUEST_BUS, &how);
131 error = smbus_poll(sc, how);
132 } while (error == EWOULDBLOCK);
135 if (sc->owner && sc->owner != dev)
136 error = smbus_poll(sc, how);
142 /* free any allocated resource */
144 mtx_unlock(&sc->lock);
145 SMBUS_CALLBACK(parent, SMB_RELEASE_BUS, &how);
149 mtx_unlock(&sc->lock);
155 * smbus_release_bus()
157 * Release the device allocated with smbus_request_dev()
160 smbus_release_bus(device_t bus, device_t dev)
162 struct smbus_softc *sc = device_get_softc(bus);
165 /* first, ask the underlying layers if the release is ok */
166 error = SMBUS_CALLBACK(device_get_parent(bus), SMB_RELEASE_BUS, NULL);
172 if (sc->owner == dev) {
175 /* wakeup waiting processes */
179 mtx_unlock(&sc->lock);