1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 1998, 2001 Nicolas Souchu
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD$
29 */
30
31 #include <sys/param.h>
32 #include <sys/kernel.h>
33 #include <sys/systm.h>
34 #include <sys/module.h>
35 #include <sys/bus.h>
36 #include <sys/conf.h>
37 #include <sys/uio.h>
38 #include <sys/fcntl.h>
39
40 #include <dev/smbus/smbconf.h>
41 #include <dev/smbus/smbus.h>
42 #include <dev/smbus/smb.h>
43
44 #include "smbus_if.h"
45
46 #define SMB_OLD_READB _IOW('i', 7, struct smbcmd)
47 #define SMB_OLD_READW _IOW('i', 8, struct smbcmd)
48 #define SMB_OLD_PCALL _IOW('i', 9, struct smbcmd)
49
50 struct smb_softc {
51 device_t sc_dev;
52 struct cdev *sc_devnode;
53 };
54
55 static void smb_identify(driver_t *driver, device_t parent);
56 static int smb_probe(device_t);
57 static int smb_attach(device_t);
58 static int smb_detach(device_t);
59
60 static devclass_t smb_devclass;
61
62 static device_method_t smb_methods[] = {
63 /* device interface */
64 DEVMETHOD(device_identify, smb_identify),
65 DEVMETHOD(device_probe, smb_probe),
66 DEVMETHOD(device_attach, smb_attach),
67 DEVMETHOD(device_detach, smb_detach),
68
69 /* smbus interface */
70 DEVMETHOD(smbus_intr, smbus_generic_intr),
71
72 { 0, 0 }
73 };
74
75 static driver_t smb_driver = {
76 "smb",
77 smb_methods,
78 sizeof(struct smb_softc),
79 };
80
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_ioctl = smbioctl,
87 .d_name = "smb",
88 };
89
90 static void
smb_identify(driver_t * driver,device_t parent)91 smb_identify(driver_t *driver, device_t parent)
92 {
93
94 if (device_find_child(parent, "smb", -1) == NULL)
95 BUS_ADD_CHILD(parent, 0, "smb", -1);
96 }
97
98 static int
smb_probe(device_t dev)99 smb_probe(device_t dev)
100 {
101 if (smbus_get_addr(dev) != -1)
102 return (ENXIO);
103
104 device_set_desc(dev, "SMBus generic I/O");
105 return (BUS_PROBE_NOWILDCARD);
106 }
107
108 static int
smb_attach(device_t dev)109 smb_attach(device_t dev)
110 {
111 struct smb_softc *sc;
112 struct make_dev_args mda;
113 int error;
114
115 sc = device_get_softc(dev);
116 sc->sc_dev = dev;
117
118 make_dev_args_init(&mda);
119 mda.mda_devsw = &smb_cdevsw;
120 mda.mda_unit = device_get_unit(dev);
121 mda.mda_uid = UID_ROOT;
122 mda.mda_gid = GID_WHEEL;
123 mda.mda_mode = 0600;
124 mda.mda_si_drv1 = sc;
125 error = make_dev_s(&mda, &sc->sc_devnode, "smb%d", mda.mda_unit);
126 return (error);
127 }
128
129 static int
smb_detach(device_t dev)130 smb_detach(device_t dev)
131 {
132 struct smb_softc *sc;
133
134 sc = device_get_softc(dev);
135 destroy_dev(sc->sc_devnode);
136 return (0);
137 }
138
139 static int
smbioctl(struct cdev * dev,u_long cmd,caddr_t data,int flags,struct thread * td)140 smbioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td)
141 {
142 char buf[SMB_MAXBLOCKSIZE];
143 device_t parent;
144 struct smbcmd *s = (struct smbcmd *)data;
145 struct smb_softc *sc = dev->si_drv1;
146 device_t smbdev = sc->sc_dev;
147 int error;
148 int unit;
149 u_char bcount;
150
151 /*
152 * If a specific slave device is being used, override any passed-in
153 * slave.
154 */
155 unit = dev2unit(dev);
156 if (unit & 0x0400)
157 s->slave = unit & 0x03ff;
158
159 parent = device_get_parent(smbdev);
160
161 /* Make sure that LSB bit is cleared. */
162 if (s->slave & 0x1)
163 return (EINVAL);
164
165 /* Allocate the bus. */
166 if ((error = smbus_request_bus(parent, smbdev,
167 (flags & O_NONBLOCK) ? SMB_DONTWAIT : (SMB_WAIT | SMB_INTR))))
168 return (error);
169
170 switch (cmd) {
171 case SMB_QUICK_WRITE:
172 error = smbus_error(smbus_quick(parent, s->slave, SMB_QWRITE));
173 break;
174
175 case SMB_QUICK_READ:
176 error = smbus_error(smbus_quick(parent, s->slave, SMB_QREAD));
177 break;
178
179 case SMB_SENDB:
180 error = smbus_error(smbus_sendb(parent, s->slave, s->cmd));
181 break;
182
183 case SMB_RECVB:
184 error = smbus_error(smbus_recvb(parent, s->slave, &s->cmd));
185 break;
186
187 case SMB_WRITEB:
188 error = smbus_error(smbus_writeb(parent, s->slave, s->cmd,
189 s->wdata.byte));
190 break;
191
192 case SMB_WRITEW:
193 error = smbus_error(smbus_writew(parent, s->slave,
194 s->cmd, s->wdata.word));
195 break;
196
197 case SMB_OLD_READB:
198 case SMB_READB:
199 /* NB: for SMB_OLD_READB the read data goes to rbuf only. */
200 error = smbus_error(smbus_readb(parent, s->slave, s->cmd,
201 &s->rdata.byte));
202 if (error)
203 break;
204 if (s->rbuf && s->rcount >= 1) {
205 error = copyout(&s->rdata.byte, s->rbuf, 1);
206 s->rcount = 1;
207 }
208 break;
209
210 case SMB_OLD_READW:
211 case SMB_READW:
212 /* NB: for SMB_OLD_READW the read data goes to rbuf only. */
213 error = smbus_error(smbus_readw(parent, s->slave, s->cmd,
214 &s->rdata.word));
215 if (error)
216 break;
217 if (s->rbuf && s->rcount >= 2) {
218 buf[0] = (u_char)s->rdata.word;
219 buf[1] = (u_char)(s->rdata.word >> 8);
220 error = copyout(buf, s->rbuf, 2);
221 s->rcount = 2;
222 }
223 break;
224
225 case SMB_OLD_PCALL:
226 case SMB_PCALL:
227 /* NB: for SMB_OLD_PCALL the read data goes to rbuf only. */
228 error = smbus_error(smbus_pcall(parent, s->slave, s->cmd,
229 s->wdata.word, &s->rdata.word));
230 if (error)
231 break;
232 if (s->rbuf && s->rcount >= 2) {
233 buf[0] = (u_char)s->rdata.word;
234 buf[1] = (u_char)(s->rdata.word >> 8);
235 error = copyout(buf, s->rbuf, 2);
236 s->rcount = 2;
237 }
238
239 break;
240
241 case SMB_BWRITE:
242 if (s->wcount < 0) {
243 error = EINVAL;
244 break;
245 }
246 if (s->wcount > SMB_MAXBLOCKSIZE)
247 s->wcount = SMB_MAXBLOCKSIZE;
248 if (s->wcount)
249 error = copyin(s->wbuf, buf, s->wcount);
250 if (error)
251 break;
252 error = smbus_error(smbus_bwrite(parent, s->slave, s->cmd,
253 s->wcount, buf));
254 break;
255
256 case SMB_BREAD:
257 if (s->rcount < 0) {
258 error = EINVAL;
259 break;
260 }
261 if (s->rcount > SMB_MAXBLOCKSIZE)
262 s->rcount = SMB_MAXBLOCKSIZE;
263 error = smbus_error(smbus_bread(parent, s->slave, s->cmd,
264 &bcount, buf));
265 if (error)
266 break;
267 if (s->rcount > bcount)
268 s->rcount = bcount;
269 error = copyout(buf, s->rbuf, s->rcount);
270 break;
271
272 default:
273 error = ENOTTY;
274 }
275
276 smbus_release_bus(parent, smbdev);
277
278 return (error);
279 }
280
281 DRIVER_MODULE(smb, smbus, smb_driver, smb_devclass, 0, 0);
282 MODULE_DEPEND(smb, smbus, SMBUS_MINVER, SMBUS_PREFVER, SMBUS_MAXVER);
283 MODULE_VERSION(smb, 1);
284