1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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
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 SMB_OLD_READB _IOW('i', 7, struct smbcmd)
45 #define SMB_OLD_READW _IOW('i', 8, struct smbcmd)
46 #define SMB_OLD_PCALL _IOW('i', 9, struct smbcmd)
47
48 struct smb_softc {
49 device_t sc_dev;
50 struct cdev *sc_devnode;
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 device_method_t smb_methods[] = {
59 /* device interface */
60 DEVMETHOD(device_identify, smb_identify),
61 DEVMETHOD(device_probe, smb_probe),
62 DEVMETHOD(device_attach, smb_attach),
63 DEVMETHOD(device_detach, smb_detach),
64
65 /* smbus interface */
66 DEVMETHOD(smbus_intr, smbus_generic_intr),
67 { 0, 0 }
68 };
69
70 static driver_t smb_driver = {
71 "smb",
72 smb_methods,
73 sizeof(struct smb_softc),
74 };
75
76 static d_ioctl_t smbioctl;
77
78 static struct cdevsw smb_cdevsw = {
79 .d_version = D_VERSION,
80 .d_flags = D_TRACKCLOSE,
81 .d_ioctl = smbioctl,
82 .d_name = "smb",
83 };
84
85 static void
smb_identify(driver_t * driver,device_t parent)86 smb_identify(driver_t *driver, device_t parent)
87 {
88
89 if (device_find_child(parent, "smb", -1) == NULL)
90 BUS_ADD_CHILD(parent, 0, "smb", -1);
91 }
92
93 static int
smb_probe(device_t dev)94 smb_probe(device_t dev)
95 {
96 if (smbus_get_addr(dev) != -1)
97 return (ENXIO);
98
99 device_set_desc(dev, "SMBus generic I/O");
100 return (BUS_PROBE_NOWILDCARD);
101 }
102
103 static int
smb_attach(device_t dev)104 smb_attach(device_t dev)
105 {
106 struct smb_softc *sc;
107 struct make_dev_args mda;
108 int error;
109
110 sc = device_get_softc(dev);
111 sc->sc_dev = dev;
112
113 make_dev_args_init(&mda);
114 mda.mda_devsw = &smb_cdevsw;
115 mda.mda_unit = device_get_unit(dev);
116 mda.mda_uid = UID_ROOT;
117 mda.mda_gid = GID_WHEEL;
118 mda.mda_mode = 0600;
119 mda.mda_si_drv1 = sc;
120 error = make_dev_s(&mda, &sc->sc_devnode, "smb%d", mda.mda_unit);
121 return (error);
122 }
123
124 static int
smb_detach(device_t dev)125 smb_detach(device_t dev)
126 {
127 struct smb_softc *sc;
128
129 sc = device_get_softc(dev);
130 destroy_dev(sc->sc_devnode);
131 return (0);
132 }
133
134 static int
smbioctl(struct cdev * dev,u_long cmd,caddr_t data,int flags,struct thread * td)135 smbioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td)
136 {
137 char buf[SMB_MAXBLOCKSIZE];
138 device_t parent;
139 struct smbcmd *s = (struct smbcmd *)data;
140 struct smb_softc *sc = dev->si_drv1;
141 device_t smbdev = sc->sc_dev;
142 int error;
143 int unit;
144 u_char bcount;
145
146 /*
147 * If a specific slave device is being used, override any passed-in
148 * slave.
149 */
150 unit = dev2unit(dev);
151 if (unit & 0x0400)
152 s->slave = unit & 0x03ff;
153
154 parent = device_get_parent(smbdev);
155
156 /* Make sure that LSB bit is cleared. */
157 if (s->slave & 0x1)
158 return (EINVAL);
159
160 /* Allocate the bus. */
161 if ((error = smbus_request_bus(parent, smbdev,
162 (flags & O_NONBLOCK) ? SMB_DONTWAIT : (SMB_WAIT | SMB_INTR))))
163 return (error);
164
165 switch (cmd) {
166 case SMB_QUICK_WRITE:
167 error = smbus_error(smbus_quick(parent, s->slave, SMB_QWRITE));
168 break;
169
170 case SMB_QUICK_READ:
171 error = smbus_error(smbus_quick(parent, s->slave, SMB_QREAD));
172 break;
173
174 case SMB_SENDB:
175 error = smbus_error(smbus_sendb(parent, s->slave, s->cmd));
176 break;
177
178 case SMB_RECVB:
179 error = smbus_error(smbus_recvb(parent, s->slave, &s->cmd));
180 break;
181
182 case SMB_WRITEB:
183 error = smbus_error(smbus_writeb(parent, s->slave, s->cmd,
184 s->wdata.byte));
185 break;
186
187 case SMB_WRITEW:
188 error = smbus_error(smbus_writew(parent, s->slave,
189 s->cmd, s->wdata.word));
190 break;
191
192 case SMB_OLD_READB:
193 case SMB_READB:
194 /* NB: for SMB_OLD_READB the read data goes to rbuf only. */
195 error = smbus_error(smbus_readb(parent, s->slave, s->cmd,
196 &s->rdata.byte));
197 if (error)
198 break;
199 if (s->rbuf && s->rcount >= 1) {
200 error = copyout(&s->rdata.byte, s->rbuf, 1);
201 s->rcount = 1;
202 }
203 break;
204
205 case SMB_OLD_READW:
206 case SMB_READW:
207 /* NB: for SMB_OLD_READW the read data goes to rbuf only. */
208 error = smbus_error(smbus_readw(parent, s->slave, s->cmd,
209 &s->rdata.word));
210 if (error)
211 break;
212 if (s->rbuf && s->rcount >= 2) {
213 buf[0] = (u_char)s->rdata.word;
214 buf[1] = (u_char)(s->rdata.word >> 8);
215 error = copyout(buf, s->rbuf, 2);
216 s->rcount = 2;
217 }
218 break;
219
220 case SMB_OLD_PCALL:
221 case SMB_PCALL:
222 /* NB: for SMB_OLD_PCALL the read data goes to rbuf only. */
223 error = smbus_error(smbus_pcall(parent, s->slave, s->cmd,
224 s->wdata.word, &s->rdata.word));
225 if (error)
226 break;
227 if (s->rbuf && s->rcount >= 2) {
228 buf[0] = (u_char)s->rdata.word;
229 buf[1] = (u_char)(s->rdata.word >> 8);
230 error = copyout(buf, s->rbuf, 2);
231 s->rcount = 2;
232 }
233
234 break;
235
236 case SMB_BWRITE:
237 if (s->wcount < 0) {
238 error = EINVAL;
239 break;
240 }
241 if (s->wcount > SMB_MAXBLOCKSIZE)
242 s->wcount = SMB_MAXBLOCKSIZE;
243 if (s->wcount)
244 error = copyin(s->wbuf, buf, s->wcount);
245 if (error)
246 break;
247 error = smbus_error(smbus_bwrite(parent, s->slave, s->cmd,
248 s->wcount, buf));
249 break;
250
251 case SMB_BREAD:
252 if (s->rcount < 0) {
253 error = EINVAL;
254 break;
255 }
256 if (s->rcount > SMB_MAXBLOCKSIZE)
257 s->rcount = SMB_MAXBLOCKSIZE;
258 error = smbus_error(smbus_bread(parent, s->slave, s->cmd,
259 &bcount, buf));
260 if (error)
261 break;
262 if (s->rcount > bcount)
263 s->rcount = bcount;
264 error = copyout(buf, s->rbuf, s->rcount);
265 break;
266
267 default:
268 error = ENOTTY;
269 }
270
271 smbus_release_bus(parent, smbdev);
272
273 return (error);
274 }
275
276 DRIVER_MODULE(smb, smbus, smb_driver, 0, 0);
277 MODULE_DEPEND(smb, smbus, SMBUS_MINVER, SMBUS_PREFVER, SMBUS_MAXVER);
278 MODULE_VERSION(smb, 1);
279