smb.c revision 38813 
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 1.1.1.1 1998/09/03 20:52:53 nsouch 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 73
96static struct cdevsw smb_cdevsw =
97	{ smbopen,	smbclose,	smbread,	smbwrite,	/*73*/
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	struct smb_softc *sc = (struct smb_softc *)device_get_softc(dev);
123
124	return (0);
125}
126
127static int
128smbopen (dev_t dev, int flags, int fmt, struct proc *p)
129{
130	struct smb_softc *sc = IIC_SOFTC(minor(dev));
131
132	if (!sc)
133		return (EINVAL);
134
135	if (sc->sc_count)
136		return (EBUSY);
137
138	sc->sc_count++;
139
140	return (0);
141}
142
143static int
144smbclose(dev_t dev, int flags, int fmt, struct proc *p)
145{
146	struct smb_softc *sc = IIC_SOFTC(minor(dev));
147
148	if (!sc)
149		return (EINVAL);
150
151	if (!sc->sc_count)
152		return (EINVAL);
153
154	sc->sc_count--;
155
156	return (0);
157}
158
159static int
160smbwrite(dev_t dev, struct uio * uio, int ioflag)
161{
162	device_t smbdev = IIC_DEVICE(minor(dev));
163	struct smb_softc *sc = IIC_SOFTC(minor(dev));
164	int error, count;
165
166	if (!sc || !smbdev)
167		return (EINVAL);
168
169	if (sc->sc_count == 0)
170		return (EINVAL);
171
172	count = min(uio->uio_resid, BUFSIZE);
173	uiomove(sc->sc_buffer, count, uio);
174
175	/* we consider the command char as the first character to send */
176	smbus_bwrite(device_get_parent(smbdev), sc->sc_addr,
177				sc->sc_buffer[0], count-1, sc->sc_buffer+1);
178
179	return (0);
180}
181
182static int
183smbread(dev_t dev, struct uio * uio, int ioflag)
184{
185	/* not supported */
186
187	return (EINVAL);
188}
189
190static int
191smbioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p)
192{
193	device_t smbdev = IIC_DEVICE(minor(dev));
194	struct smb_softc *sc = IIC_SOFTC(minor(dev));
195	device_t parent = device_get_parent(smbdev);
196
197	int error = 0;
198	struct smbcmd *s = (struct smbcmd *)data;
199
200	if (!sc)
201		return (EINVAL);
202
203	switch (cmd) {
204	case SMB_QUICK_WRITE:
205		smbus_quick(parent, sc->sc_addr, SMB_QWRITE);
206		goto end;
207
208	case SMB_QUICK_READ:
209		smbus_quick(parent, sc->sc_addr, SMB_QREAD);
210		goto end;
211	};
212
213	if (!s)
214		return (EINVAL);
215
216	switch (cmd) {
217	case SMB_SENDB:
218		smbus_sendb(parent, sc->sc_addr, s->cmd);
219		break;
220
221	case SMB_RECVB:
222		smbus_recvb(parent, sc->sc_addr, &s->cmd);
223		break;
224
225	case SMB_WRITEB:
226		smbus_writeb(parent, sc->sc_addr, s->cmd, s->data.byte);
227		break;
228
229	case SMB_WRITEW:
230		smbus_writew(parent, sc->sc_addr, s->cmd, s->data.word);
231		break;
232
233	case SMB_READB:
234		if (s->data.byte_ptr)
235			smbus_readb(parent, sc->sc_addr, s->cmd,
236							s->data.byte_ptr);
237		break;
238
239	case SMB_READW:
240		if (s->data.word_ptr)
241			smbus_readw(parent, sc->sc_addr, s->cmd, s->data.word_ptr);
242		break;
243
244	case SMB_PCALL:
245		if (s->data.process.rdata)
246			smbus_pcall(parent, sc->sc_addr, s->cmd,
247				s->data.process.sdata, s->data.process.rdata);
248		break;
249
250	case SMB_BWRITE:
251		if (s->count && s->data.byte_ptr)
252			smbus_bwrite(parent, sc->sc_addr, s->cmd, s->count,
253							s->data.byte_ptr);
254		break;
255
256	case SMB_BREAD:
257		if (s->count && s->data.byte_ptr)
258			smbus_bread(parent, sc->sc_addr, s->cmd, s->count,
259							s->data.byte_ptr);
260		break;
261
262	default:
263		error = ENODEV;
264	}
265
266end:
267	return (error);
268}
269
270static int smb_devsw_installed = 0;
271
272static void
273smb_drvinit(void *unused)
274{
275        dev_t dev;
276
277        if( ! smb_devsw_installed ) {
278                dev = makedev(CDEV_MAJOR,0);
279                cdevsw_add(&dev,&smb_cdevsw,NULL);
280                smb_devsw_installed = 1;
281        }
282}
283
284CDEV_DRIVER_MODULE(smb, smbus, smb_driver, smb_devclass, CDEV_MAJOR,
285			smb_cdevsw, 0, 0);
286
287#if 0
288SYSINIT(smbdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,smb_drvinit,NULL)
289#endif
290