2 * Copyright (c) 1998, 2001 Nicolas Souchu
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
48 #include <sys/param.h>
50 #include <sys/kernel.h>
52 #include <sys/module.h>
53 #include <sys/mutex.h>
54 #include <sys/systm.h>
57 #include <dev/iicbus/iiconf.h>
58 #include <dev/iicbus/iicbus.h>
60 #include <dev/smbus/smbconf.h>
62 #include "iicbus_if.h"
67 #define SMB_WAITING_ADDR 0x0
68 #define SMB_WAITING_LOW 0x1
69 #define SMB_WAITING_HIGH 0x2
73 u_char devaddr; /* slave device address */
75 char low; /* low byte received first */
76 char high; /* high byte */
82 static int iicsmb_probe(device_t);
83 static int iicsmb_attach(device_t);
84 static int iicsmb_detach(device_t);
85 static void iicsmb_identify(driver_t *driver, device_t parent);
87 static int iicsmb_intr(device_t dev, int event, char *buf);
88 static int iicsmb_callback(device_t dev, int index, void *data);
89 static int iicsmb_quick(device_t dev, u_char slave, int how);
90 static int iicsmb_sendb(device_t dev, u_char slave, char byte);
91 static int iicsmb_recvb(device_t dev, u_char slave, char *byte);
92 static int iicsmb_writeb(device_t dev, u_char slave, char cmd, char byte);
93 static int iicsmb_writew(device_t dev, u_char slave, char cmd, short word);
94 static int iicsmb_readb(device_t dev, u_char slave, char cmd, char *byte);
95 static int iicsmb_readw(device_t dev, u_char slave, char cmd, short *word);
96 static int iicsmb_pcall(device_t dev, u_char slave, char cmd, short sdata, short *rdata);
97 static int iicsmb_bwrite(device_t dev, u_char slave, char cmd, u_char count, char *buf);
98 static int iicsmb_bread(device_t dev, u_char slave, char cmd, u_char *count, char *buf);
100 static devclass_t iicsmb_devclass;
102 static device_method_t iicsmb_methods[] = {
103 /* device interface */
104 DEVMETHOD(device_identify, iicsmb_identify),
105 DEVMETHOD(device_probe, iicsmb_probe),
106 DEVMETHOD(device_attach, iicsmb_attach),
107 DEVMETHOD(device_detach, iicsmb_detach),
109 /* iicbus interface */
110 DEVMETHOD(iicbus_intr, iicsmb_intr),
112 /* smbus interface */
113 DEVMETHOD(smbus_callback, iicsmb_callback),
114 DEVMETHOD(smbus_quick, iicsmb_quick),
115 DEVMETHOD(smbus_sendb, iicsmb_sendb),
116 DEVMETHOD(smbus_recvb, iicsmb_recvb),
117 DEVMETHOD(smbus_writeb, iicsmb_writeb),
118 DEVMETHOD(smbus_writew, iicsmb_writew),
119 DEVMETHOD(smbus_readb, iicsmb_readb),
120 DEVMETHOD(smbus_readw, iicsmb_readw),
121 DEVMETHOD(smbus_pcall, iicsmb_pcall),
122 DEVMETHOD(smbus_bwrite, iicsmb_bwrite),
123 DEVMETHOD(smbus_bread, iicsmb_bread),
128 static driver_t iicsmb_driver = {
131 sizeof(struct iicsmb_softc),
134 #define IICBUS_TIMEOUT 100 /* us */
137 iicsmb_identify(driver_t *driver, device_t parent)
140 if (device_find_child(parent, "iicsmb", -1) == NULL)
141 BUS_ADD_CHILD(parent, 0, "iicsmb", -1);
145 iicsmb_probe(device_t dev)
147 device_set_desc(dev, "SMBus over I2C bridge");
148 return (BUS_PROBE_NOWILDCARD);
152 iicsmb_attach(device_t dev)
154 struct iicsmb_softc *sc = (struct iicsmb_softc *)device_get_softc(dev);
156 mtx_init(&sc->lock, "iicsmb", NULL, MTX_DEF);
158 sc->smbus = device_add_child(dev, "smbus", -1);
160 /* probe and attach the smbus */
161 bus_generic_attach(dev);
167 iicsmb_detach(device_t dev)
169 struct iicsmb_softc *sc = (struct iicsmb_softc *)device_get_softc(dev);
171 bus_generic_detach(dev);
173 device_delete_child(dev, sc->smbus);
175 mtx_destroy(&sc->lock);
183 * iicbus interrupt handler
186 iicsmb_intr(device_t dev, int event, char *buf)
188 struct iicsmb_softc *sc = (struct iicsmb_softc *)device_get_softc(dev);
194 sc->state = SMB_WAITING_ADDR;
198 /* call smbus intr handler */
199 smbus_intr(sc->smbus, sc->devaddr,
200 sc->low, sc->high, SMB_ENOERR);
206 /* XXX too much data, discard */
207 printf("%s: too much data from 0x%x\n", __func__,
211 case SMB_WAITING_ADDR:
212 sc->devaddr = (u_char)*buf;
213 sc->state = SMB_WAITING_LOW;
216 case SMB_WAITING_LOW:
218 sc->state = SMB_WAITING_HIGH;
221 case SMB_WAITING_HIGH:
223 sc->state = SMB_DONE;
236 smbus_intr(sc->smbus, sc->devaddr, 0, 0, SMB_EBUSERR);
240 printf("%s unknown error 0x%x!\n", __func__,
247 panic("%s: unknown event (%d)!", __func__, event);
249 mtx_unlock(&sc->lock);
255 iicsmb_callback(device_t dev, int index, void *data)
257 device_t parent = device_get_parent(dev);
262 case SMB_REQUEST_BUS:
263 /* request underlying iicbus */
265 error = iicbus_request_bus(parent, dev, how);
268 case SMB_RELEASE_BUS:
269 /* release underlying iicbus */
270 error = iicbus_release_bus(parent, dev);
281 iicsmb_quick(device_t dev, u_char slave, int how)
283 device_t parent = device_get_parent(dev);
288 error = iicbus_start(parent, slave & ~LSB, IICBUS_TIMEOUT);
292 error = iicbus_start(parent, slave | LSB, IICBUS_TIMEOUT);
301 error = iicbus_stop(parent);
307 iicsmb_sendb(device_t dev, u_char slave, char byte)
309 device_t parent = device_get_parent(dev);
312 error = iicbus_start(parent, slave & ~LSB, IICBUS_TIMEOUT);
315 error = iicbus_write(parent, &byte, 1, &sent, IICBUS_TIMEOUT);
324 iicsmb_recvb(device_t dev, u_char slave, char *byte)
326 device_t parent = device_get_parent(dev);
329 error = iicbus_start(parent, slave | LSB, 0);
332 error = iicbus_read(parent, byte, 1, &read, IIC_LAST_READ, IICBUS_TIMEOUT);
341 iicsmb_writeb(device_t dev, u_char slave, char cmd, char byte)
343 device_t parent = device_get_parent(dev);
346 error = iicbus_start(parent, slave & ~LSB, 0);
349 if (!(error = iicbus_write(parent, &cmd, 1, &sent, IICBUS_TIMEOUT)))
350 error = iicbus_write(parent, &byte, 1, &sent, IICBUS_TIMEOUT);
359 iicsmb_writew(device_t dev, u_char slave, char cmd, short word)
361 device_t parent = device_get_parent(dev);
364 char low = (char)(word & 0xff);
365 char high = (char)((word & 0xff00) >> 8);
367 error = iicbus_start(parent, slave & ~LSB, 0);
370 if (!(error = iicbus_write(parent, &cmd, 1, &sent, IICBUS_TIMEOUT)))
371 if (!(error = iicbus_write(parent, &low, 1, &sent, IICBUS_TIMEOUT)))
372 error = iicbus_write(parent, &high, 1, &sent, IICBUS_TIMEOUT);
381 iicsmb_readb(device_t dev, u_char slave, char cmd, char *byte)
383 device_t parent = device_get_parent(dev);
384 int error, sent, read;
386 if ((error = iicbus_start(parent, slave & ~LSB, IICBUS_TIMEOUT)))
389 if ((error = iicbus_write(parent, &cmd, 1, &sent, IICBUS_TIMEOUT)))
392 if ((error = iicbus_repeated_start(parent, slave | LSB, IICBUS_TIMEOUT)))
395 if ((error = iicbus_read(parent, byte, 1, &read, IIC_LAST_READ, IICBUS_TIMEOUT)))
403 #define BUF2SHORT(low,high) \
404 ((short)(((high) & 0xff) << 8) | (short)((low) & 0xff))
407 iicsmb_readw(device_t dev, u_char slave, char cmd, short *word)
409 device_t parent = device_get_parent(dev);
410 int error, sent, read;
413 if ((error = iicbus_start(parent, slave & ~LSB, IICBUS_TIMEOUT)))
416 if ((error = iicbus_write(parent, &cmd, 1, &sent, IICBUS_TIMEOUT)))
419 if ((error = iicbus_repeated_start(parent, slave | LSB, IICBUS_TIMEOUT)))
422 if ((error = iicbus_read(parent, buf, 2, &read, IIC_LAST_READ, IICBUS_TIMEOUT)))
425 /* first, receive low, then high byte */
426 *word = BUF2SHORT(buf[0], buf[1]);
434 iicsmb_pcall(device_t dev, u_char slave, char cmd, short sdata, short *rdata)
436 device_t parent = device_get_parent(dev);
437 int error, sent, read;
440 if ((error = iicbus_start(parent, slave & ~LSB, IICBUS_TIMEOUT)))
443 if ((error = iicbus_write(parent, &cmd, 1, &sent, IICBUS_TIMEOUT)))
446 /* first, send low, then high byte */
447 buf[0] = (char)(sdata & 0xff);
448 buf[1] = (char)((sdata & 0xff00) >> 8);
450 if ((error = iicbus_write(parent, buf, 2, &sent, IICBUS_TIMEOUT)))
453 if ((error = iicbus_repeated_start(parent, slave | LSB, IICBUS_TIMEOUT)))
456 if ((error = iicbus_read(parent, buf, 2, &read, IIC_LAST_READ, IICBUS_TIMEOUT)))
459 /* first, receive low, then high byte */
460 *rdata = BUF2SHORT(buf[0], buf[1]);
468 iicsmb_bwrite(device_t dev, u_char slave, char cmd, u_char count, char *buf)
470 device_t parent = device_get_parent(dev);
473 if ((error = iicbus_start(parent, slave & ~LSB, IICBUS_TIMEOUT)))
476 if ((error = iicbus_write(parent, &cmd, 1, &sent, IICBUS_TIMEOUT)))
479 if ((error = iicbus_write(parent, buf, (int)count, &sent, IICBUS_TIMEOUT)))
482 if ((error = iicbus_stop(parent)))
490 iicsmb_bread(device_t dev, u_char slave, char cmd, u_char *count, char *buf)
492 device_t parent = device_get_parent(dev);
493 int error, sent, read;
495 if ((error = iicbus_start(parent, slave & ~LSB, IICBUS_TIMEOUT)))
498 if ((error = iicbus_write(parent, &cmd, 1, &sent, IICBUS_TIMEOUT)))
501 if ((error = iicbus_repeated_start(parent, slave | LSB, IICBUS_TIMEOUT)))
504 if ((error = iicbus_read(parent, buf, (int)*count, &read,
505 IIC_LAST_READ, IICBUS_TIMEOUT)))
514 DRIVER_MODULE(iicsmb, iicbus, iicsmb_driver, iicsmb_devclass, 0, 0);
515 DRIVER_MODULE(smbus, iicsmb, smbus_driver, smbus_devclass, 0, 0);
516 MODULE_DEPEND(iicsmb, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER);
517 MODULE_DEPEND(iicsmb, smbus, SMBUS_MINVER, SMBUS_PREFVER, SMBUS_MAXVER);
518 MODULE_VERSION(iicsmb, 1);