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
26 * $FreeBSD: src/sys/dev/smbus/smbconf.c,v 1.13.10.1 2006/09/22 19:19:16 jhb Exp $
27 * $DragonFly: src/sys/bus/smbus/smbconf.c,v 1.5 2005/06/02 20:40:38 dillon Exp $
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/module.h>
34 #include <sys/thread2.h>
44 smbus_intr(device_t bus
, u_char devaddr
, char low
, char high
, int error
)
46 struct smbus_softc
*sc
= (struct smbus_softc
*)device_get_softc(bus
);
48 /* call owner's intr routine */
50 SMBUS_INTR(sc
->owner
, devaddr
, low
, high
, error
);
56 * Converts an smbus error to a unix error.
59 smbus_error(int smb_error
)
63 if (smb_error
== SMB_ENOERR
)
66 if (smb_error
& (SMB_ENOTSUPP
))
68 else if (smb_error
& (SMB_ENOACK
))
70 else if (smb_error
& (SMB_ETIMEOUT
))
72 else if (smb_error
& (SMB_EBUSY
))
74 else if (smb_error
& (SMB_EABORT
| SMB_EBUSERR
| SMB_ECOLLI
))
83 smbus_poll(struct smbus_softc
*sc
, int how
)
88 case (SMB_WAIT
| SMB_INTR
):
89 error
= tsleep(sc
, PCATCH
, "smbreq", 0);
92 case (SMB_WAIT
| SMB_NOINTR
):
93 error
= tsleep(sc
, 0, "smbreq", 0);
105 * smbus_request_bus()
107 * Allocate the device to perform transfers.
109 * how : SMB_WAIT or SMB_DONTWAIT
112 smbus_request_bus(device_t bus
, device_t dev
, int how
)
114 struct smbus_softc
*sc
= device_get_softc(bus
);
118 /* first, ask the underlying layers if the request is ok */
119 parent
= device_get_parent(bus
);
121 error
= SMBUS_CALLBACK(parent
, SMB_REQUEST_BUS
, &how
);
123 error
= smbus_poll(sc
, how
);
124 } while (error
== EWOULDBLOCK
);
128 if (sc
->owner
&& sc
->owner
!= dev
) {
130 error
= smbus_poll(sc
, how
);
131 if (error
== EWOULDBLOCK
)
139 /* free any allocated resource */
140 SMBUS_CALLBACK(parent
, SMB_RELEASE_BUS
, &how
);
147 * smbus_release_bus()
149 * Release the device allocated with smbus_request_dev()
152 smbus_release_bus(device_t bus
, device_t dev
)
154 struct smbus_softc
*sc
= (struct smbus_softc
*)device_get_softc(bus
);
158 parent
= device_get_parent(bus
);
159 /* first, ask the underlying layers if the release is ok */
160 error
= SMBUS_CALLBACK(parent
, SMB_RELEASE_BUS
, NULL
);
166 if (sc
->owner
== dev
) {
169 /* wakeup waiting processes */
176 /* wakeup waiting processes */