2 * Copyright (c) 1998 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 1.5.2.2 2000/08/09 00:59:27 peter Exp $
27 * $DragonFly: src/sys/bus/iicbus/iicsmb.c,v 1.4 2005/02/17 13:59:35 joerg Exp $
49 #include <sys/param.h>
50 #include <sys/kernel.h>
51 #include <sys/systm.h>
52 #include <sys/module.h>
57 #include <sys/malloc.h>
59 #include <machine/clock.h>
64 #include <bus/smbus/smbconf.h>
66 #include "iicbus_if.h"
71 #define SMB_WAITING_ADDR 0x0
72 #define SMB_WAITING_LOW 0x1
73 #define SMB_WAITING_HIGH 0x2
77 u_char devaddr; /* slave device address */
79 char low; /* low byte received first */
80 char high; /* high byte */
85 static int iicsmb_probe(device_t);
86 static int iicsmb_attach(device_t);
88 static void iicsmb_intr(device_t dev, int event, char *buf);
89 static int iicsmb_callback(device_t dev, int index, caddr_t data);
90 static int iicsmb_quick(device_t dev, u_char slave, int how);
91 static int iicsmb_sendb(device_t dev, u_char slave, char byte);
92 static int iicsmb_recvb(device_t dev, u_char slave, char *byte);
93 static int iicsmb_writeb(device_t dev, u_char slave, char cmd, char byte);
94 static int iicsmb_writew(device_t dev, u_char slave, char cmd, short word);
95 static int iicsmb_readb(device_t dev, u_char slave, char cmd, char *byte);
96 static int iicsmb_readw(device_t dev, u_char slave, char cmd, short *word);
97 static int iicsmb_pcall(device_t dev, u_char slave, char cmd, short sdata, short *rdata);
98 static int iicsmb_bwrite(device_t dev, u_char slave, char cmd, u_char count, char *buf);
99 static int iicsmb_bread(device_t dev, u_char slave, char cmd, u_char count, char *buf);
101 static devclass_t iicsmb_devclass;
103 static device_method_t iicsmb_methods[] = {
104 /* device interface */
105 DEVMETHOD(device_probe, iicsmb_probe),
106 DEVMETHOD(device_attach, iicsmb_attach),
107 DEVMETHOD(device_detach, bus_generic_detach),
110 DEVMETHOD(bus_print_child, bus_generic_print_child),
112 /* iicbus interface */
113 DEVMETHOD(iicbus_intr, iicsmb_intr),
115 /* smbus interface */
116 DEVMETHOD(smbus_callback, iicsmb_callback),
117 DEVMETHOD(smbus_quick, iicsmb_quick),
118 DEVMETHOD(smbus_sendb, iicsmb_sendb),
119 DEVMETHOD(smbus_recvb, iicsmb_recvb),
120 DEVMETHOD(smbus_writeb, iicsmb_writeb),
121 DEVMETHOD(smbus_writew, iicsmb_writew),
122 DEVMETHOD(smbus_readb, iicsmb_readb),
123 DEVMETHOD(smbus_readw, iicsmb_readw),
124 DEVMETHOD(smbus_pcall, iicsmb_pcall),
125 DEVMETHOD(smbus_bwrite, iicsmb_bwrite),
126 DEVMETHOD(smbus_bread, iicsmb_bread),
131 static driver_t iicsmb_driver = {
134 sizeof(struct iicsmb_softc),
138 iicsmb_probe(device_t dev)
140 struct iicsmb_softc *sc = (struct iicsmb_softc *)device_get_softc(dev);
142 sc->smbus = smbus_alloc_bus(dev);
145 return (EINVAL); /* XXX don't know what to return else */
151 iicsmb_attach(device_t dev)
153 struct iicsmb_softc *sc = (struct iicsmb_softc *)device_get_softc(dev);
155 /* probe and attach the smbus */
156 device_probe_and_attach(sc->smbus);
164 * iicbus interrupt handler
167 iicsmb_intr(device_t dev, int event, char *buf)
169 struct iicsmb_softc *sc = (struct iicsmb_softc *)device_get_softc(dev);
174 sc->state = SMB_WAITING_ADDR;
178 /* call smbus intr handler */
179 smbus_intr(sc->smbus, sc->devaddr,
180 sc->low, sc->high, SMB_ENOERR);
186 /* XXX too much data, discard */
187 printf("%s: too much data from 0x%x\n", __func__,
191 case SMB_WAITING_ADDR:
192 sc->devaddr = (u_char)*buf;
193 sc->state = SMB_WAITING_LOW;
196 case SMB_WAITING_LOW:
198 sc->state = SMB_WAITING_HIGH;
201 case SMB_WAITING_HIGH:
203 sc->state = SMB_DONE;
216 smbus_intr(sc->smbus, sc->devaddr, 0, 0, SMB_EBUSERR);
220 printf("%s unknown error 0x%x!\n", __func__,
227 panic("%s: unknown event (%d)!", __func__, event);
234 iicsmb_callback(device_t dev, int index, caddr_t data)
236 device_t parent = device_get_parent(dev);
241 case SMB_REQUEST_BUS:
242 /* request underlying iicbus */
244 error = iicbus_request_bus(parent, dev, how);
247 case SMB_RELEASE_BUS:
248 /* release underlying iicbus */
249 error = iicbus_release_bus(parent, dev);
260 iicsmb_quick(device_t dev, u_char slave, int how)
262 device_t parent = device_get_parent(dev);
267 error = iicbus_start(parent, slave & ~LSB, 0);
271 error = iicbus_start(parent, slave | LSB, 0);
280 error = iicbus_stop(parent);
286 iicsmb_sendb(device_t dev, u_char slave, char byte)
288 device_t parent = device_get_parent(dev);
291 error = iicbus_start(parent, slave & ~LSB, 0);
294 error = iicbus_write(parent, &byte, 1, &sent, 0);
303 iicsmb_recvb(device_t dev, u_char slave, char *byte)
305 device_t parent = device_get_parent(dev);
308 error = iicbus_start(parent, slave | LSB, 0);
311 error = iicbus_read(parent, byte, 1, &read, IIC_LAST_READ, 0);
320 iicsmb_writeb(device_t dev, u_char slave, char cmd, char byte)
322 device_t parent = device_get_parent(dev);
325 error = iicbus_start(parent, slave & ~LSB, 0);
328 if (!(error = iicbus_write(parent, &cmd, 1, &sent, 0)))
329 error = iicbus_write(parent, &byte, 1, &sent, 0);
338 iicsmb_writew(device_t dev, u_char slave, char cmd, short word)
340 device_t parent = device_get_parent(dev);
343 char low = (char)(word & 0xff);
344 char high = (char)((word & 0xff00) >> 8);
346 error = iicbus_start(parent, slave & ~LSB, 0);
349 if (!(error = iicbus_write(parent, &cmd, 1, &sent, 0)))
350 if (!(error = iicbus_write(parent, &low, 1, &sent, 0)))
351 error = iicbus_write(parent, &high, 1, &sent, 0);
360 iicsmb_readb(device_t dev, u_char slave, char cmd, char *byte)
362 device_t parent = device_get_parent(dev);
363 int error, sent, read;
365 if ((error = iicbus_start(parent, slave & ~LSB, 0)))
368 if ((error = iicbus_write(parent, &cmd, 1, &sent, 0)))
371 if ((error = iicbus_repeated_start(parent, slave | LSB, 0)))
374 if ((error = iicbus_read(parent, byte, 1, &read, IIC_LAST_READ, 0)))
382 #define BUF2SHORT(low,high) \
383 ((short)(((high) & 0xff) << 8) | (short)((low) & 0xff))
386 iicsmb_readw(device_t dev, u_char slave, char cmd, short *word)
388 device_t parent = device_get_parent(dev);
389 int error, sent, read;
392 if ((error = iicbus_start(parent, slave & ~LSB, 0)))
395 if ((error = iicbus_write(parent, &cmd, 1, &sent, 0)))
398 if ((error = iicbus_repeated_start(parent, slave | LSB, 0)))
401 if ((error = iicbus_read(parent, buf, 2, &read, IIC_LAST_READ, 0)))
404 /* first, receive low, then high byte */
405 *word = BUF2SHORT(buf[0], buf[1]);
413 iicsmb_pcall(device_t dev, u_char slave, char cmd, short sdata, short *rdata)
415 device_t parent = device_get_parent(dev);
416 int error, sent, read;
419 if ((error = iicbus_start(parent, slave & ~LSB, 0)))
422 if ((error = iicbus_write(parent, &cmd, 1, &sent, 0)))
425 /* first, send low, then high byte */
426 buf[0] = (char)(sdata & 0xff);
427 buf[1] = (char)((sdata & 0xff00) >> 8);
429 if ((error = iicbus_write(parent, buf, 2, &sent, 0)))
432 if ((error = iicbus_repeated_start(parent, slave | LSB, 0)))
435 if ((error = iicbus_read(parent, buf, 2, &read, IIC_LAST_READ, 0)))
438 /* first, receive low, then high byte */
439 *rdata = BUF2SHORT(buf[0], buf[1]);
447 iicsmb_bwrite(device_t dev, u_char slave, char cmd, u_char count, char *buf)
449 device_t parent = device_get_parent(dev);
452 if ((error = iicbus_start(parent, slave & ~LSB, 0)))
455 if ((error = iicbus_write(parent, &cmd, 1, &sent, 0)))
458 if ((error = iicbus_write(parent, buf, (int)count, &sent, 0)))
461 if ((error = iicbus_stop(parent)))
469 iicsmb_bread(device_t dev, u_char slave, char cmd, u_char count, char *buf)
471 device_t parent = device_get_parent(dev);
472 int error, sent, read;
474 if ((error = iicbus_start(parent, slave & ~LSB, 0)))
477 if ((error = iicbus_write(parent, &cmd, 1, &sent, 0)))
480 if ((error = iicbus_repeated_start(parent, slave | LSB, 0)))
483 if ((error = iicbus_read(parent, buf, (int)count, &read,
492 DRIVER_MODULE(iicsmb, iicbus, iicsmb_driver, iicsmb_devclass, 0, 0);