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
26 * $FreeBSD: src/sys/dev/iicbus/iicsmb.c,v 1.18 2009/02/10 22:50:23 imp Exp $
27 * $DragonFly: src/sys/bus/iicbus/iicsmb.c,v 1.5 2006/12/22 23:12:16 swildner Exp $
49 #include <sys/param.h>
51 #include <sys/kernel.h>
52 #include <sys/module.h>
53 #include <sys/systm.h>
56 #include <bus/iicbus/iiconf.h>
57 #include <bus/iicbus/iicbus.h>
59 #include <bus/smbus/smbconf.h>
61 #include "iicbus_if.h"
66 #define SMB_WAITING_ADDR 0x0
67 #define SMB_WAITING_LOW 0x1
68 #define SMB_WAITING_HIGH 0x2
72 u_char devaddr; /* slave device address */
74 char low; /* low byte received first */
75 char high; /* high byte */
80 static int iicsmb_probe(device_t);
81 static int iicsmb_attach(device_t);
82 static int iicsmb_detach(device_t);
83 static void iicsmb_identify(driver_t *driver, device_t parent);
85 static int iicsmb_intr(device_t dev, int event, char *buf);
86 static int iicsmb_callback(device_t dev, int index, void *data);
87 static int iicsmb_quick(device_t dev, u_char slave, int how);
88 static int iicsmb_sendb(device_t dev, u_char slave, char byte);
89 static int iicsmb_recvb(device_t dev, u_char slave, char *byte);
90 static int iicsmb_writeb(device_t dev, u_char slave, char cmd, char byte);
91 static int iicsmb_writew(device_t dev, u_char slave, char cmd, short word);
92 static int iicsmb_readb(device_t dev, u_char slave, char cmd, char *byte);
93 static int iicsmb_readw(device_t dev, u_char slave, char cmd, short *word);
94 static int iicsmb_pcall(device_t dev, u_char slave, char cmd, short sdata, short *rdata);
95 static int iicsmb_bwrite(device_t dev, u_char slave, char cmd, u_char count, char *buf);
96 static int iicsmb_bread(device_t dev, u_char slave, char cmd, u_char *count, char *buf);
98 static devclass_t iicsmb_devclass;
100 static device_method_t iicsmb_methods[] = {
101 /* device interface */
102 DEVMETHOD(device_identify, iicsmb_identify),
103 DEVMETHOD(device_probe, iicsmb_probe),
104 DEVMETHOD(device_attach, iicsmb_attach),
105 DEVMETHOD(device_detach, iicsmb_detach),
108 DEVMETHOD(bus_driver_added, bus_generic_driver_added),
109 DEVMETHOD(bus_print_child, bus_generic_print_child),
111 /* iicbus interface */
112 DEVMETHOD(iicbus_intr, iicsmb_intr),
114 /* smbus interface */
115 DEVMETHOD(smbus_callback, iicsmb_callback),
116 DEVMETHOD(smbus_quick, iicsmb_quick),
117 DEVMETHOD(smbus_sendb, iicsmb_sendb),
118 DEVMETHOD(smbus_recvb, iicsmb_recvb),
119 DEVMETHOD(smbus_writeb, iicsmb_writeb),
120 DEVMETHOD(smbus_writew, iicsmb_writew),
121 DEVMETHOD(smbus_readb, iicsmb_readb),
122 DEVMETHOD(smbus_readw, iicsmb_readw),
123 DEVMETHOD(smbus_pcall, iicsmb_pcall),
124 DEVMETHOD(smbus_bwrite, iicsmb_bwrite),
125 DEVMETHOD(smbus_bread, iicsmb_bread),
130 static driver_t iicsmb_driver = {
133 sizeof(struct iicsmb_softc),
136 #define IICBUS_TIMEOUT 100 /* us */
139 iicsmb_identify(driver_t *driver, device_t parent)
142 if (device_find_child(parent, "iicsmb", -1) == NULL)
143 BUS_ADD_CHILD(parent, parent, 0, "iicsmb", -1);
147 iicsmb_probe(device_t dev)
149 device_set_desc(dev, "SMBus over I2C bridge");
154 iicsmb_attach(device_t dev)
156 struct iicsmb_softc *sc = (struct iicsmb_softc *)device_get_softc(dev);
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);
182 * iicbus interrupt handler
185 iicsmb_intr(device_t dev, int event, char *buf)
187 struct iicsmb_softc *sc = (struct iicsmb_softc *)device_get_softc(dev);
192 sc->state = SMB_WAITING_ADDR;
196 /* call smbus intr handler */
197 smbus_intr(sc->smbus, sc->devaddr,
198 sc->low, sc->high, SMB_ENOERR);
204 /* XXX too much data, discard */
205 kprintf("%s: too much data from 0x%x\n", __func__,
209 case SMB_WAITING_ADDR:
210 sc->devaddr = (u_char)*buf;
211 sc->state = SMB_WAITING_LOW;
214 case SMB_WAITING_LOW:
216 sc->state = SMB_WAITING_HIGH;
219 case SMB_WAITING_HIGH:
221 sc->state = SMB_DONE;
234 smbus_intr(sc->smbus, sc->devaddr, 0, 0, SMB_EBUSERR);
238 kprintf("%s unknown error 0x%x!\n", __func__,
245 panic("%s: unknown event (%d)!", __func__, event);
252 iicsmb_callback(device_t dev, int index, void *data)
254 device_t parent = device_get_parent(dev);
259 case SMB_REQUEST_BUS:
260 /* request underlying iicbus */
262 error = iicbus_request_bus(parent, dev, how);
265 case SMB_RELEASE_BUS:
266 /* release underlying iicbus */
267 error = iicbus_release_bus(parent, dev);
278 iicsmb_quick(device_t dev, u_char slave, int how)
280 device_t parent = device_get_parent(dev);
285 error = iicbus_start(parent, slave & ~LSB, IICBUS_TIMEOUT);
289 error = iicbus_start(parent, slave | LSB, IICBUS_TIMEOUT);
298 error = iicbus_stop(parent);
304 iicsmb_sendb(device_t dev, u_char slave, char byte)
306 device_t parent = device_get_parent(dev);
309 error = iicbus_start(parent, slave & ~LSB, IICBUS_TIMEOUT);
312 error = iicbus_write(parent, &byte, 1, &sent, IICBUS_TIMEOUT);
321 iicsmb_recvb(device_t dev, u_char slave, char *byte)
323 device_t parent = device_get_parent(dev);
326 error = iicbus_start(parent, slave | LSB, 0);
329 error = iicbus_read(parent, byte, 1, &read, IIC_LAST_READ, IICBUS_TIMEOUT);
338 iicsmb_writeb(device_t dev, u_char slave, char cmd, char byte)
340 device_t parent = device_get_parent(dev);
343 error = iicbus_start(parent, slave & ~LSB, 0);
346 if (!(error = iicbus_write(parent, &cmd, 1, &sent, IICBUS_TIMEOUT)))
347 error = iicbus_write(parent, &byte, 1, &sent, IICBUS_TIMEOUT);
356 iicsmb_writew(device_t dev, u_char slave, char cmd, short word)
358 device_t parent = device_get_parent(dev);
361 char low = (char)(word & 0xff);
362 char high = (char)((word & 0xff00) >> 8);
364 error = iicbus_start(parent, slave & ~LSB, 0);
367 if (!(error = iicbus_write(parent, &cmd, 1, &sent, IICBUS_TIMEOUT)))
368 if (!(error = iicbus_write(parent, &low, 1, &sent, IICBUS_TIMEOUT)))
369 error = iicbus_write(parent, &high, 1, &sent, IICBUS_TIMEOUT);
378 iicsmb_readb(device_t dev, u_char slave, char cmd, char *byte)
380 device_t parent = device_get_parent(dev);
381 int error, sent, read;
383 if ((error = iicbus_start(parent, slave & ~LSB, IICBUS_TIMEOUT)))
386 if ((error = iicbus_write(parent, &cmd, 1, &sent, IICBUS_TIMEOUT)))
389 if ((error = iicbus_repeated_start(parent, slave | LSB, IICBUS_TIMEOUT)))
392 if ((error = iicbus_read(parent, byte, 1, &read, IIC_LAST_READ, IICBUS_TIMEOUT)))
400 #define BUF2SHORT(low,high) \
401 ((short)(((high) & 0xff) << 8) | (short)((low) & 0xff))
404 iicsmb_readw(device_t dev, u_char slave, char cmd, short *word)
406 device_t parent = device_get_parent(dev);
407 int error, sent, read;
410 if ((error = iicbus_start(parent, slave & ~LSB, IICBUS_TIMEOUT)))
413 if ((error = iicbus_write(parent, &cmd, 1, &sent, IICBUS_TIMEOUT)))
416 if ((error = iicbus_repeated_start(parent, slave | LSB, IICBUS_TIMEOUT)))
419 if ((error = iicbus_read(parent, buf, 2, &read, IIC_LAST_READ, IICBUS_TIMEOUT)))
422 /* first, receive low, then high byte */
423 *word = BUF2SHORT(buf[0], buf[1]);
431 iicsmb_pcall(device_t dev, u_char slave, char cmd, short sdata, short *rdata)
433 device_t parent = device_get_parent(dev);
434 int error, sent, read;
437 if ((error = iicbus_start(parent, slave & ~LSB, IICBUS_TIMEOUT)))
440 if ((error = iicbus_write(parent, &cmd, 1, &sent, IICBUS_TIMEOUT)))
443 /* first, send low, then high byte */
444 buf[0] = (char)(sdata & 0xff);
445 buf[1] = (char)((sdata & 0xff00) >> 8);
447 if ((error = iicbus_write(parent, buf, 2, &sent, IICBUS_TIMEOUT)))
450 if ((error = iicbus_repeated_start(parent, slave | LSB, IICBUS_TIMEOUT)))
453 if ((error = iicbus_read(parent, buf, 2, &read, IIC_LAST_READ, IICBUS_TIMEOUT)))
456 /* first, receive low, then high byte */
457 *rdata = BUF2SHORT(buf[0], buf[1]);
465 iicsmb_bwrite(device_t dev, u_char slave, char cmd, u_char count, char *buf)
467 device_t parent = device_get_parent(dev);
470 if ((error = iicbus_start(parent, slave & ~LSB, IICBUS_TIMEOUT)))
473 if ((error = iicbus_write(parent, &cmd, 1, &sent, IICBUS_TIMEOUT)))
476 if ((error = iicbus_write(parent, buf, (int)count, &sent, IICBUS_TIMEOUT)))
479 if ((error = iicbus_stop(parent)))
487 iicsmb_bread(device_t dev, u_char slave, char cmd, u_char *count, char *buf)
489 device_t parent = device_get_parent(dev);
490 int error, sent, read;
492 if ((error = iicbus_start(parent, slave & ~LSB, IICBUS_TIMEOUT)))
495 if ((error = iicbus_write(parent, &cmd, 1, &sent, IICBUS_TIMEOUT)))
498 if ((error = iicbus_repeated_start(parent, slave | LSB, IICBUS_TIMEOUT)))
501 if ((error = iicbus_read(parent, buf, (int)*count, &read,
502 IIC_LAST_READ, IICBUS_TIMEOUT)))
511 DRIVER_MODULE(iicsmb, iicbus, iicsmb_driver, iicsmb_devclass, 0, 0);
512 DRIVER_MODULE(smbus, iicsmb, smbus_driver, smbus_devclass, 0, 0);
513 MODULE_DEPEND(iicsmb, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER);
514 MODULE_DEPEND(iicsmb, smbus, SMBUS_MINVER, SMBUS_PREFVER, SMBUS_MAXVER);
515 MODULE_VERSION(iicsmb, 1);