1 /*-
2 * Copyright (c) 1998, 2001 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 * $FreeBSD$
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/uio.h>
36 #include <sys/fcntl.h>
37
38 #include <dev/smbus/smbconf.h>
39 #include <dev/smbus/smbus.h>
40 #include <dev/smbus/smb.h>
41
42 #include "smbus_if.h"
43
44 #define BUFSIZE 1024
45
46 struct smb_softc {
47 device_t sc_dev;
48 int sc_count; /* >0 if device opened */
49 struct cdev *sc_devnode;
50 struct mtx sc_lock;
51 };
52
53 static void smb_identify(driver_t *driver, device_t parent);
54 static int smb_probe(device_t);
55 static int smb_attach(device_t);
56 static int smb_detach(device_t);
57
58 static devclass_t smb_devclass;
59
60 static device_method_t smb_methods[] = {
61 /* device interface */
62 DEVMETHOD(device_identify, smb_identify),
63 DEVMETHOD(device_probe, smb_probe),
64 DEVMETHOD(device_attach, smb_attach),
65 DEVMETHOD(device_detach, smb_detach),
66
67 /* smbus interface */
68 DEVMETHOD(smbus_intr, smbus_generic_intr),
69
70 { 0, 0 }
71 };
72
73 static driver_t smb_driver = {
74 "smb",
75 smb_methods,
76 sizeof(struct smb_softc),
77 };
78
79 static d_open_t smbopen;
80 static d_close_t smbclose;
81 static d_ioctl_t smbioctl;
82
83 static struct cdevsw smb_cdevsw = {
84 .d_version = D_VERSION,
85 .d_flags = D_TRACKCLOSE,
86 .d_open = smbopen,
87 .d_close = smbclose,
88 .d_ioctl = smbioctl,
89 .d_name = "smb",
90 };
91
92 static void
smb_identify(driver_t * driver,device_t parent)93 smb_identify(driver_t *driver, device_t parent)
94 {
95
96 if (device_find_child(parent, "smb", -1) == NULL)
97 BUS_ADD_CHILD(parent, 0, "smb", -1);
98 }
99
100 static int
smb_probe(device_t dev)101 smb_probe(device_t dev)
102 {
103 if (smbus_get_addr(dev) != -1)
104 return (ENXIO);
105
106 device_set_desc(dev, "SMBus generic I/O");
107 return (BUS_PROBE_NOWILDCARD);
108 }
109
110 static int
smb_attach(device_t dev)111 smb_attach(device_t dev)
112 {
113 struct smb_softc *sc = device_get_softc(dev);
114 int unit;
115
116 unit = device_get_unit(dev);
117 sc->sc_dev = dev;
118
119 sc->sc_devnode = make_dev(&smb_cdevsw, unit, UID_ROOT, GID_WHEEL,
120 0600, "smb%d", unit);
121 sc->sc_devnode->si_drv1 = sc;
122 mtx_init(&sc->sc_lock, device_get_nameunit(dev), NULL, MTX_DEF);
123
124 return (0);
125 }
126
127 static int
smb_detach(device_t dev)128 smb_detach(device_t dev)
129 {
130 struct smb_softc *sc = (struct smb_softc *)device_get_softc(dev);
131
132 if (sc->sc_devnode)
133 destroy_dev(sc->sc_devnode);
134 mtx_destroy(&sc->sc_lock);
135
136 return (0);
137 }
138
139 static int
smbopen(struct cdev * dev,int flags,int fmt,struct thread * td)140 smbopen(struct cdev *dev, int flags, int fmt, struct thread *td)
141 {
142 struct smb_softc *sc = dev->si_drv1;
143
144 mtx_lock(&sc->sc_lock);
145 if (sc->sc_count != 0) {
146 mtx_unlock(&sc->sc_lock);
147 return (EBUSY);
148 }
149
150 sc->sc_count++;
151 mtx_unlock(&sc->sc_lock);
152
153 return (0);
154 }
155
156 static int
smbclose(struct cdev * dev,int flags,int fmt,struct thread * td)157 smbclose(struct cdev *dev, int flags, int fmt, struct thread *td)
158 {
159 struct smb_softc *sc = dev->si_drv1;
160
161 mtx_lock(&sc->sc_lock);
162 KASSERT(sc->sc_count == 1, ("device not busy"));
163 sc->sc_count--;
164 mtx_unlock(&sc->sc_lock);
165
166 return (0);
167 }
168
169 static int
smbioctl(struct cdev * dev,u_long cmd,caddr_t data,int flags,struct thread * td)170 smbioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td)
171 {
172 char buf[SMB_MAXBLOCKSIZE];
173 device_t parent;
174 struct smbcmd *s = (struct smbcmd *)data;
175 struct smb_softc *sc = dev->si_drv1;
176 device_t smbdev = sc->sc_dev;
177 int error;
178 int unit;
179 u_char bcount;
180
181 /*
182 * If a specific slave device is being used, override any passed-in
183 * slave.
184 */
185 unit = dev2unit(dev);
186 if (unit & 0x0400)
187 s->slave = unit & 0x03ff;
188
189 parent = device_get_parent(smbdev);
190
191 /* Make sure that LSB bit is cleared. */
192 if (s->slave & 0x1)
193 return (EINVAL);
194
195 /* Allocate the bus. */
196 if ((error = smbus_request_bus(parent, smbdev,
197 (flags & O_NONBLOCK) ? SMB_DONTWAIT : (SMB_WAIT | SMB_INTR))))
198 return (error);
199
200 switch (cmd) {
201 case SMB_QUICK_WRITE:
202 error = smbus_error(smbus_quick(parent, s->slave, SMB_QWRITE));
203 break;
204
205 case SMB_QUICK_READ:
206 error = smbus_error(smbus_quick(parent, s->slave, SMB_QREAD));
207 break;
208
209 case SMB_SENDB:
210 error = smbus_error(smbus_sendb(parent, s->slave, s->cmd));
211 break;
212
213 case SMB_RECVB:
214 error = smbus_error(smbus_recvb(parent, s->slave, &s->cmd));
215 break;
216
217 case SMB_WRITEB:
218 error = smbus_error(smbus_writeb(parent, s->slave, s->cmd,
219 s->wdata.byte));
220 break;
221
222 case SMB_WRITEW:
223 error = smbus_error(smbus_writew(parent, s->slave,
224 s->cmd, s->wdata.word));
225 break;
226
227 case SMB_READB:
228 error = smbus_error(smbus_readb(parent, s->slave, s->cmd,
229 &s->rdata.byte));
230 if (error)
231 break;
232 if (s->rbuf && s->rcount >= 1) {
233 error = copyout(&s->rdata.byte, s->rbuf, 1);
234 s->rcount = 1;
235 }
236 break;
237
238 case SMB_READW:
239 error = smbus_error(smbus_readw(parent, s->slave, s->cmd,
240 &s->rdata.word));
241 if (error)
242 break;
243 if (s->rbuf && s->rcount >= 2) {
244 buf[0] = (u_char)s->rdata.word;
245 buf[1] = (u_char)(s->rdata.word >> 8);
246 error = copyout(buf, s->rbuf, 2);
247 s->rcount = 2;
248 }
249 break;
250
251 case SMB_PCALL:
252 error = smbus_error(smbus_pcall(parent, s->slave, s->cmd,
253 s->wdata.word, &s->rdata.word));
254 if (error)
255 break;
256 if (s->rbuf && s->rcount >= 2) {
257 buf[0] = (u_char)s->rdata.word;
258 buf[1] = (u_char)(s->rdata.word >> 8);
259 error = copyout(buf, s->rbuf, 2);
260 s->rcount = 2;
261 }
262
263 break;
264
265 case SMB_BWRITE:
266 if (s->wcount < 0) {
267 error = EINVAL;
268 break;
269 }
270 if (s->wcount > SMB_MAXBLOCKSIZE)
271 s->wcount = SMB_MAXBLOCKSIZE;
272 if (s->wcount)
273 error = copyin(s->wbuf, buf, s->wcount);
274 if (error)
275 break;
276 error = smbus_error(smbus_bwrite(parent, s->slave, s->cmd,
277 s->wcount, buf));
278 break;
279
280 case SMB_BREAD:
281 if (s->rcount < 0) {
282 error = EINVAL;
283 break;
284 }
285 if (s->rcount > SMB_MAXBLOCKSIZE)
286 s->rcount = SMB_MAXBLOCKSIZE;
287 error = smbus_error(smbus_bread(parent, s->slave, s->cmd,
288 &bcount, buf));
289 if (error)
290 break;
291 if (s->rcount > bcount)
292 s->rcount = bcount;
293 error = copyout(buf, s->rbuf, s->rcount);
294 break;
295
296 case SMB_TRANS:
297 if (s->rcount < 0 || s->wcount < 0) {
298 error = EINVAL;
299 break;
300 }
301 if (s->rcount > SMB_MAXBLOCKSIZE)
302 s->rcount = SMB_MAXBLOCKSIZE;
303 if (s->wcount > SMB_MAXBLOCKSIZE)
304 s->wcount = SMB_MAXBLOCKSIZE;
305 if (s->wcount)
306 error = copyin(s->wbuf, buf, s->wcount);
307 if (error)
308 break;
309 error = smbus_error(smbus_trans(parent, s->slave, s->cmd,
310 s->op, buf, s->wcount, buf, s->rcount, &s->rcount));
311 if (error == 0)
312 error = copyout(buf, s->rbuf, s->rcount);
313 break;
314 default:
315 error = ENOTTY;
316 }
317
318 smbus_release_bus(parent, smbdev);
319
320 return (error);
321 }
322
323 DRIVER_MODULE(smb, smbus, smb_driver, smb_devclass, 0, 0);
324 MODULE_DEPEND(smb, smbus, SMBUS_MINVER, SMBUS_PREFVER, SMBUS_MAXVER);
325 MODULE_VERSION(smb, 1);
326