smb.c revision 48557 
1/*-
2 * Copyright (c) 1998 Nicolas Souchu
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
13 *
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
24 * SUCH DAMAGE.
25 *
26 *	$Id: smb.c,v 1.13 1999/05/31 11:25:05 phk Exp $
27 *
28 */
29#include <sys/param.h>
30#include <sys/kernel.h>
31#include <sys/systm.h>
32#include <sys/module.h>
33#include <sys/bus.h>
34#include <sys/conf.h>
35#include <sys/buf.h>
36#include <sys/uio.h>
37#include <sys/malloc.h>
38#include <sys/fcntl.h>
39
40#include <machine/clock.h>
41
42#include <dev/smbus/smbconf.h>
43#include <dev/smbus/smbus.h>
44#include <machine/smb.h>
45
46#include "smbus_if.h"
47
48#define BUFSIZE 1024
49
50struct smb_softc {
51
52	int sc_addr;			/* address on smbus */
53	int sc_count;			/* >0 if device opened */
54
55	char *sc_cp;			/* output buffer pointer */
56
57	char sc_buffer[BUFSIZE];	/* output buffer */
58	char sc_inbuf[BUFSIZE];		/* input buffer */
59};
60
61#define IIC_SOFTC(unit) \
62	((struct smb_softc *)devclass_get_softc(smb_devclass, (unit)))
63
64#define IIC_DEVICE(unit) \
65	(devclass_get_device(smb_devclass, (unit)))
66
67static int smb_probe(device_t);
68static int smb_attach(device_t);
69
70static devclass_t smb_devclass;
71
72static device_method_t smb_methods[] = {
73	/* device interface */
74	DEVMETHOD(device_probe,		smb_probe),
75	DEVMETHOD(device_attach,	smb_attach),
76
77	/* smbus interface */
78	DEVMETHOD(smbus_intr,		smbus_generic_intr),
79
80	{ 0, 0 }
81};
82
83static driver_t smb_driver = {
84	"smb",
85	smb_methods,
86	sizeof(struct smb_softc),
87};
88
89static	d_open_t	smbopen;
90static	d_close_t	smbclose;
91static	d_write_t	smbwrite;
92static	d_read_t	smbread;
93static	d_ioctl_t	smbioctl;
94
95#define CDEV_MAJOR 106
96static struct cdevsw smb_cdevsw = {
97	/* open */	smbopen,
98	/* close */	smbclose,
99	/* read */	smbread,
100	/* write */	smbwrite,
101	/* ioctl */	smbioctl,
102	/* stop */	nostop,
103	/* reset */	noreset,
104	/* devtotty */	nodevtotty,
105	/* poll */	nopoll,
106	/* mmap */	nommap,
107	/* strategy */	nostrategy,
108	/* name */	"smb",
109	/* parms */	noparms,
110	/* maj */	CDEV_MAJOR,
111	/* dump */	nodump,
112	/* psize */	nopsize,
113	/* flags */	0,
114	/* maxio */	0,
115	/* bmaj */	-1
116};
117
118/*
119 * smbprobe()
120 */
121static int
122smb_probe(device_t dev)
123{
124	struct smb_softc *sc = (struct smb_softc *)device_get_softc(dev);
125	static int once;
126
127	if (!once++)
128                cdevsw_add(&smb_cdevsw);
129
130	sc->sc_addr = smbus_get_addr(dev);
131
132	/* XXX detect chip with start/stop conditions */
133
134	return (0);
135}
136
137/*
138 * smbattach()
139 */
140static int
141smb_attach(device_t dev)
142{
143	return (0);
144}
145
146static int
147smbopen (dev_t dev, int flags, int fmt, struct proc *p)
148{
149	struct smb_softc *sc = IIC_SOFTC(minor(dev));
150
151	if (!sc)
152		return (EINVAL);
153
154	if (sc->sc_count)
155		return (EBUSY);
156
157	sc->sc_count++;
158
159	return (0);
160}
161
162static int
163smbclose(dev_t dev, int flags, int fmt, struct proc *p)
164{
165	struct smb_softc *sc = IIC_SOFTC(minor(dev));
166
167	if (!sc)
168		return (EINVAL);
169
170	if (!sc->sc_count)
171		return (EINVAL);
172
173	sc->sc_count--;
174
175	return (0);
176}
177
178static int
179smbwrite(dev_t dev, struct uio * uio, int ioflag)
180{
181	/* not supported */
182
183	return (ENODEV);
184}
185
186static int
187smbread(dev_t dev, struct uio * uio, int ioflag)
188{
189	/* not supported */
190
191	return (ENODEV);
192}
193
194static int
195smbioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p)
196{
197	device_t smbdev = IIC_DEVICE(minor(dev));
198	struct smb_softc *sc = IIC_SOFTC(minor(dev));
199	device_t parent = device_get_parent(smbdev);
200
201	int error = 0;
202	struct smbcmd *s = (struct smbcmd *)data;
203
204	if (!sc || !s)
205		return (EINVAL);
206
207	/* allocate the bus */
208	if ((error = smbus_request_bus(parent, smbdev,
209			(flags & O_NONBLOCK) ? SMB_DONTWAIT : (SMB_WAIT | SMB_INTR))))
210		return (error);
211
212	switch (cmd) {
213	case SMB_QUICK_WRITE:
214		error = smbus_error(smbus_quick(parent, s->slave, SMB_QWRITE));
215		break;
216
217	case SMB_QUICK_READ:
218		error = smbus_error(smbus_quick(parent, s->slave, SMB_QREAD));
219		break;
220
221	case SMB_SENDB:
222		error = smbus_error(smbus_sendb(parent, s->slave, s->cmd));
223		break;
224
225	case SMB_RECVB:
226		error = smbus_error(smbus_recvb(parent, s->slave, &s->cmd));
227		break;
228
229	case SMB_WRITEB:
230		error = smbus_error(smbus_writeb(parent, s->slave, s->cmd,
231						s->data.byte));
232		break;
233
234	case SMB_WRITEW:
235		error = smbus_error(smbus_writew(parent, s->slave,
236						s->cmd, s->data.word));
237		break;
238
239	case SMB_READB:
240		if (s->data.byte_ptr)
241			error = smbus_error(smbus_readb(parent, s->slave,
242						s->cmd, s->data.byte_ptr));
243		break;
244
245	case SMB_READW:
246		if (s->data.word_ptr)
247			error = smbus_error(smbus_readw(parent, s->slave,
248						s->cmd, s->data.word_ptr));
249		break;
250
251	case SMB_PCALL:
252		if (s->data.process.rdata)
253			error = smbus_error(smbus_pcall(parent, s->slave, s->cmd,
254				s->data.process.sdata, s->data.process.rdata));
255		break;
256
257	case SMB_BWRITE:
258		if (s->count && s->data.byte_ptr)
259			error = smbus_error(smbus_bwrite(parent, s->slave,
260						s->cmd, s->count, s->data.byte_ptr));
261		break;
262
263	case SMB_BREAD:
264		if (s->count && s->data.byte_ptr)
265			error = smbus_error(smbus_bread(parent, s->slave,
266						s->cmd, s->count, s->data.byte_ptr));
267		break;
268
269	default:
270		error = ENODEV;
271	}
272
273	/* release the bus */
274	smbus_release_bus(parent, smbdev);
275
276	return (error);
277}
278
279DEV_DRIVER_MODULE(smb, smbus, smb_driver, smb_devclass, smb_cdevsw, 0, 0);
280