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 { 0, 0 }
72 };
73
74 static driver_t smb_driver = {
75 "smb",
76 smb_methods,
77 sizeof(struct smb_softc),
78 };
79
80 static d_ioctl_t smbioctl;
81
82 static struct cdevsw smb_cdevsw = {
83 .d_version = D_VERSION,
84 .d_flags = D_TRACKCLOSE,
85 .d_ioctl = smbioctl,
86 .d_name = "smb",
87 };
88
89 static void
smb_identify(driver_t * driver,device_t parent)90 smb_identify(driver_t *driver, device_t parent)
91 {
92
93 if (device_find_child(parent, "smb", -1) == NULL)
94 BUS_ADD_CHILD(parent, 0, "smb", -1);
95 }
96
97 static int
smb_probe(device_t dev)98 smb_probe(device_t dev)
99 {
100 if (smbus_get_addr(dev) != -1)
101 return (ENXIO);
102
103 device_set_desc(dev, "SMBus generic I/O");
104 return (BUS_PROBE_NOWILDCARD);
105 }
106
107 static int
smb_attach(device_t dev)108 smb_attach(device_t dev)
109 {
110 struct smb_softc *sc;
111 struct make_dev_args mda;
112 int error;
113
114 sc = device_get_softc(dev);
115 sc->sc_dev = dev;
116
117 make_dev_args_init(&mda);
118 mda.mda_devsw = &smb_cdevsw;
119 mda.mda_unit = device_get_unit(dev);
120 mda.mda_uid = UID_ROOT;
121 mda.mda_gid = GID_WHEEL;
122 mda.mda_mode = 0600;
123 mda.mda_si_drv1 = sc;
124 error = make_dev_s(&mda, &sc->sc_devnode, "smb%d", mda.mda_unit);
125 return (error);
126 }
127
128 static int
smb_detach(device_t dev)129 smb_detach(device_t dev)
130 {
131 struct smb_softc *sc;
132
133 sc = device_get_softc(dev);
134 destroy_dev(sc->sc_devnode);
135 return (0);
136 }
137
138 static int
smbioctl(struct cdev * dev,u_long cmd,caddr_t data,int flags,struct thread * td)139 smbioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td)
140 {
141 char buf[SMB_MAXBLOCKSIZE];
142 device_t parent;
143 struct smbcmd *s = (struct smbcmd *)data;
144 struct smb_softc *sc = dev->si_drv1;
145 device_t smbdev = sc->sc_dev;
146 int error;
147 int unit;
148 u_char bcount;
149
150 /*
151 * If a specific slave device is being used, override any passed-in
152 * slave.
153 */
154 unit = dev2unit(dev);
155 if (unit & 0x0400)
156 s->slave = unit & 0x03ff;
157
158 parent = device_get_parent(smbdev);
159
160 /* Make sure that LSB bit is cleared. */
161 if (s->slave & 0x1)
162 return (EINVAL);
163
164 /* Allocate the bus. */
165 if ((error = smbus_request_bus(parent, smbdev,
166 (flags & O_NONBLOCK) ? SMB_DONTWAIT : (SMB_WAIT | SMB_INTR))))
167 return (error);
168
169 switch (cmd) {
170 case SMB_QUICK_WRITE:
171 error = smbus_error(smbus_quick(parent, s->slave, SMB_QWRITE));
172 break;
173
174 case SMB_QUICK_READ:
175 error = smbus_error(smbus_quick(parent, s->slave, SMB_QREAD));
176 break;
177
178 case SMB_SENDB:
179 error = smbus_error(smbus_sendb(parent, s->slave, s->cmd));
180 break;
181
182 case SMB_RECVB:
183 error = smbus_error(smbus_recvb(parent, s->slave, &s->cmd));
184 break;
185
186 case SMB_WRITEB:
187 error = smbus_error(smbus_writeb(parent, s->slave, s->cmd,
188 s->wdata.byte));
189 break;
190
191 case SMB_WRITEW:
192 error = smbus_error(smbus_writew(parent, s->slave,
193 s->cmd, s->wdata.word));
194 break;
195
196 case SMB_OLD_READB:
197 case SMB_READB:
198 /* NB: for SMB_OLD_READB the read data goes to rbuf only. */
199 error = smbus_error(smbus_readb(parent, s->slave, s->cmd,
200 &s->rdata.byte));
201 if (error)
202 break;
203 if (s->rbuf && s->rcount >= 1) {
204 error = copyout(&s->rdata.byte, s->rbuf, 1);
205 s->rcount = 1;
206 }
207 break;
208
209 case SMB_OLD_READW:
210 case SMB_READW:
211 /* NB: for SMB_OLD_READW the read data goes to rbuf only. */
212 error = smbus_error(smbus_readw(parent, s->slave, s->cmd,
213 &s->rdata.word));
214 if (error)
215 break;
216 if (s->rbuf && s->rcount >= 2) {
217 buf[0] = (u_char)s->rdata.word;
218 buf[1] = (u_char)(s->rdata.word >> 8);
219 error = copyout(buf, s->rbuf, 2);
220 s->rcount = 2;
221 }
222 break;
223
224 case SMB_OLD_PCALL:
225 case SMB_PCALL:
226 /* NB: for SMB_OLD_PCALL the read data goes to rbuf only. */
227 error = smbus_error(smbus_pcall(parent, s->slave, s->cmd,
228 s->wdata.word, &s->rdata.word));
229 if (error)
230 break;
231 if (s->rbuf && s->rcount >= 2) {
232 buf[0] = (u_char)s->rdata.word;
233 buf[1] = (u_char)(s->rdata.word >> 8);
234 error = copyout(buf, s->rbuf, 2);
235 s->rcount = 2;
236 }
237
238 break;
239
240 case SMB_BWRITE:
241 if (s->wcount < 0) {
242 error = EINVAL;
243 break;
244 }
245 if (s->wcount > SMB_MAXBLOCKSIZE)
246 s->wcount = SMB_MAXBLOCKSIZE;
247 if (s->wcount)
248 error = copyin(s->wbuf, buf, s->wcount);
249 if (error)
250 break;
251 error = smbus_error(smbus_bwrite(parent, s->slave, s->cmd,
252 s->wcount, buf));
253 break;
254
255 case SMB_BREAD:
256 if (s->rcount < 0) {
257 error = EINVAL;
258 break;
259 }
260 if (s->rcount > SMB_MAXBLOCKSIZE)
261 s->rcount = SMB_MAXBLOCKSIZE;
262 error = smbus_error(smbus_bread(parent, s->slave, s->cmd,
263 &bcount, buf));
264 if (error)
265 break;
266 if (s->rcount > bcount)
267 s->rcount = bcount;
268 error = copyout(buf, s->rbuf, s->rcount);
269 break;
270
271 default:
272 error = ENOTTY;
273 }
274
275 smbus_release_bus(parent, smbdev);
276
277 return (error);
278 }
279
280 DRIVER_MODULE(smb, smbus, smb_driver, smb_devclass, 0, 0);
281 MODULE_DEPEND(smb, smbus, SMBUS_MINVER, SMBUS_PREFVER, SMBUS_MAXVER);
282 MODULE_VERSION(smb, 1);
283