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/* $OpenBSD: i2c_scan.c,v 1.2 2005/12/20 05:00:47 deraadt Exp $ */
/*
* Copyright (c) 2005 Alexander Yurchenko <grange@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* I2C bus scannig.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#define _I2C_PRIVATE
#include <dev/i2c/i2cvar.h>
/*
some basic devices...
0x7 == 0x0001 national lm92
0x3e == 0x01 national product
0x3f == 0x73 lm93
0x3e == 0x02
0x3f == 0x06 lm87
0xfe == 0x01 national product
0xff == 0x33 lm90
0xff == 0x49 0x52 lm99 lm89
0xff == 0x17 lm86
0xff == ?? lm83?
cannot identify lm81 lm80
0xfe == 0x4d maxim (6659/6658/6659) == lm90
no 0x7 register?? maxim (6633/6634/6635) lm92
XXX remove this block of text later
0x00 National (on LM84)
0x01 National
0x12C3 Asus (at 0x4F)
0x23 Analog Devices
0x41 Analog Devices (also at 0x16)
0x49 TI
0x4D Maxim
0x54 On Semi
0x5C SMSC
0x5D SMSC
0x55 SMSC
0x5CA3 Winbond (at 0x4F)
0x90 ITE (at 0x58)
0xA1 Philips (at 0x05 too)
0xA3 Winbond (at 0x4F)
0xAC Myson (at 0x58)
0xC3 Asus (at 0x4F)
0xDA Dallas
0x54 Microchip (at 0x7)
*/
struct {
u_int8_t start, end;
} probe_paddrs[] = {
{ 0x20, 0x2f },
{ 0x48, 0x4f },
{ 0xad, 0xad }
};
u_int8_t probe[] = { 0x3e, 0x3f, 0xfe, 0xff, 0x4f, 0x58, 0x07 };
void
iic_scan(struct device *self, struct i2cbus_attach_args *iba)
{
i2c_tag_t ic = iba->iba_tag;
u_int8_t cmd = 0, addr, data;
int i, j;
for (j = 0; j < sizeof(probe_paddrs)/sizeof(probe_paddrs[0]); j++) {
for (addr = probe_paddrs[j].start; addr <= probe_paddrs[j].end;
addr++) {
/* Perform RECEIVE BYTE command */
ic->ic_acquire_bus(ic->ic_cookie, I2C_F_POLL);
if (ic->ic_exec(ic->ic_cookie, I2C_OP_READ_WITH_STOP, addr,
&cmd, 1, NULL, 0, I2C_F_POLL) == 0) {
printf("addr 0x%x at %s: ", addr, self->dv_xname);
for (i = 0; i < sizeof(probe); i++) {
cmd = probe[i];
if (ic->ic_exec(ic->ic_cookie,
I2C_OP_READ_WITH_STOP, addr,
&cmd, 1, &data, 1, I2C_F_POLL) == 0 &&
data != 0xff)
printf(" %02x=%02x", cmd, data);
}
printf("\n");
}
ic->ic_release_bus(ic->ic_cookie, I2C_F_POLL);
}
}
}
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