smb.c revision 42442 
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 1.4 1998/12/07 21:58:17 archie 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
39#include <machine/clock.h>
40
41#include <dev/smbus/smbconf.h>
42#include <dev/smbus/smbus.h>
43#include <machine/smb.h>
44
45#include "smbus_if.h"
46
47#define BUFSIZE 1024
48
49struct smb_softc {
50
51	int sc_addr;			/* address on smbus */
52	int sc_count;			/* >0 if device opened */
53
54	char *sc_cp;			/* output buffer pointer */
55
56	char sc_buffer[BUFSIZE];	/* output buffer */
57	char sc_inbuf[BUFSIZE];		/* input buffer */
58};
59
60#define IIC_SOFTC(unit) \
61	((struct smb_softc *)devclass_get_softc(smb_devclass, (unit)))
62
63#define IIC_DEVICE(unit) \
64	(devclass_get_device(smb_devclass, (unit)))
65
66static int smb_probe(device_t);
67static int smb_attach(device_t);
68
69static devclass_t smb_devclass;
70
71static device_method_t smb_methods[] = {
72	/* device interface */
73	DEVMETHOD(device_probe,		smb_probe),
74	DEVMETHOD(device_attach,	smb_attach),
75
76	/* smbus interface */
77	DEVMETHOD(smbus_intr,		smbus_generic_intr),
78
79	{ 0, 0 }
80};
81
82static driver_t smb_driver = {
83	"smb",
84	smb_methods,
85	DRIVER_TYPE_MISC,
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	{ smbopen,	smbclose,	smbread,	smbwrite,	/*106*/
98	  smbioctl,	nullstop,	nullreset,	nodevtotty,	/*smb*/
99	  seltrue,	nommap,		nostrat,	"smb",	NULL,	-1 };
100
101/*
102 * smbprobe()
103 */
104static int
105smb_probe(device_t dev)
106{
107	struct smb_softc *sc = (struct smb_softc *)device_get_softc(dev);
108
109	sc->sc_addr = smbus_get_addr(dev);
110
111	/* XXX detect chip with start/stop conditions */
112
113	return (0);
114}
115
116/*
117 * smbattach()
118 */
119static int
120smb_attach(device_t dev)
121{
122	return (0);
123}
124
125static int
126smbopen (dev_t dev, int flags, int fmt, struct proc *p)
127{
128	struct smb_softc *sc = IIC_SOFTC(minor(dev));
129
130	if (!sc)
131		return (EINVAL);
132
133	if (sc->sc_count)
134		return (EBUSY);
135
136	sc->sc_count++;
137
138	return (0);
139}
140
141static int
142smbclose(dev_t dev, int flags, int fmt, struct proc *p)
143{
144	struct smb_softc *sc = IIC_SOFTC(minor(dev));
145
146	if (!sc)
147		return (EINVAL);
148
149	if (!sc->sc_count)
150		return (EINVAL);
151
152	sc->sc_count--;
153
154	return (0);
155}
156
157static int
158smbwrite(dev_t dev, struct uio * uio, int ioflag)
159{
160	/* not supported */
161
162	return (EINVAL);
163}
164
165static int
166smbread(dev_t dev, struct uio * uio, int ioflag)
167{
168	/* not supported */
169
170	return (EINVAL);
171}
172
173static int
174smbioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p)
175{
176	device_t smbdev = IIC_DEVICE(minor(dev));
177	struct smb_softc *sc = IIC_SOFTC(minor(dev));
178	device_t parent = device_get_parent(smbdev);
179
180	int error = 0;
181	struct smbcmd *s = (struct smbcmd *)data;
182
183	if (!sc || !s)
184		return (EINVAL);
185
186	switch (cmd) {
187	case SMB_QUICK_WRITE:
188		smbus_quick(parent, s->slave, SMB_QWRITE);
189		goto end;
190
191	case SMB_QUICK_READ:
192		smbus_quick(parent, s->slave, SMB_QREAD);
193		goto end;
194	};
195
196	switch (cmd) {
197	case SMB_SENDB:
198		smbus_sendb(parent, s->slave, s->cmd);
199		break;
200
201	case SMB_RECVB:
202		smbus_recvb(parent, s->slave, &s->cmd);
203		break;
204
205	case SMB_WRITEB:
206		smbus_writeb(parent, s->slave, s->cmd, s->data.byte);
207		break;
208
209	case SMB_WRITEW:
210		smbus_writew(parent, s->slave, s->cmd, s->data.word);
211		break;
212
213	case SMB_READB:
214		if (s->data.byte_ptr)
215			smbus_readb(parent, s->slave, s->cmd,
216							s->data.byte_ptr);
217		break;
218
219	case SMB_READW:
220		if (s->data.word_ptr)
221			smbus_readw(parent, s->slave, s->cmd, s->data.word_ptr);
222		break;
223
224	case SMB_PCALL:
225		if (s->data.process.rdata)
226			smbus_pcall(parent, s->slave, s->cmd,
227				s->data.process.sdata, s->data.process.rdata);
228		break;
229
230	case SMB_BWRITE:
231		if (s->count && s->data.byte_ptr)
232			smbus_bwrite(parent, s->slave, s->cmd, s->count,
233							s->data.byte_ptr);
234		break;
235
236	case SMB_BREAD:
237		if (s->count && s->data.byte_ptr)
238			smbus_bread(parent, s->slave, s->cmd, s->count,
239							s->data.byte_ptr);
240		break;
241
242	default:
243		error = ENODEV;
244	}
245
246end:
247	return (error);
248}
249
250static int smb_devsw_installed = 0;
251
252static void
253smb_drvinit(void *unused)
254{
255        dev_t dev;
256
257        if( ! smb_devsw_installed ) {
258                dev = makedev(CDEV_MAJOR,0);
259                cdevsw_add(&dev,&smb_cdevsw,NULL);
260                smb_devsw_installed = 1;
261        }
262}
263
264CDEV_DRIVER_MODULE(smb, smbus, smb_driver, smb_devclass, CDEV_MAJOR,
265			smb_cdevsw, 0, 0);
266
267SYSINIT(smbdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,smb_drvinit,NULL)
268