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|
/* $OpenBSD: i2c_scan.c,v 1.28 2005/12/27 22:49:57 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 scanning.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#define _I2C_PRIVATE
#include <dev/i2c/i2cvar.h>
#define I2C_DEBUG
void iic_probe(struct device *, struct i2cbus_attach_args *, u_int8_t);
/*
* some basic rules for finding devices...
*
* 0x7 == 0x0001 national lm92
* 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)
*/
/* addresses at which to probe for sensors */
struct {
u_int8_t start, end;
} probe_addrs[] = {
{ 0x18, 0x18 },
{ 0x1a, 0x1a },
{ 0x20, 0x2f },
{ 0x48, 0x4f }
};
/* registers to print if we fail to probe */
u_int8_t probereg[] = {
0x00, 0x01, 0x02, 0x03, 0x07,
0x3d, 0x3e, 0x3f,
0x4c, 0x4d, 0x4e, 0x4f,
0x58, 0xfe, 0xff
};
static i2c_tag_t probe_ic;
static u_int8_t probe_addr;
static u_int8_t probe_val[256];
static void probeinit(struct i2cbus_attach_args *, u_int8_t);
static u_int8_t probenc(u_int8_t);
static u_int8_t probe(u_int8_t);
static u_int16_t probew(u_int8_t);
static int lm75probe(void);
static void
probeinit(struct i2cbus_attach_args *iba, u_int8_t addr)
{
probe_ic = iba->iba_tag;
probe_addr = addr;
memset(probe_val, 0xff, sizeof probe_val);
}
static u_int8_t
probenc(u_int8_t cmd)
{
u_int8_t data;
probe_ic->ic_acquire_bus(probe_ic->ic_cookie, I2C_F_POLL);
if (iic_exec(probe_ic, I2C_OP_READ_WITH_STOP,
probe_addr, &cmd, 1, &data, 1, I2C_F_POLL) != 0)
data = 0xff;
probe_ic->ic_release_bus(probe_ic->ic_cookie, I2C_F_POLL);
return (data);
}
static u_int16_t
probew(u_int8_t cmd)
{
u_int16_t data2;
probe_ic->ic_acquire_bus(probe_ic->ic_cookie, I2C_F_POLL);
if (iic_exec(probe_ic, I2C_OP_READ_WITH_STOP,
probe_addr, &cmd, 1, &data2, 2, I2C_F_POLL) != 0)
data2 = 0xffff;
probe_ic->ic_release_bus(probe_ic->ic_cookie, I2C_F_POLL);
return (data2);
}
static u_int8_t
probe(u_int8_t cmd)
{
if (probe_val[cmd] != 0xff)
return probe_val[cmd];
probe_val[cmd] = probenc(cmd);
return (probe_val[cmd]);
}
/*
* 0x06 and 0x07 return whatever value was read before, and the
* chip loops every 8 registers.
*/
static int
lm75probe(void)
{
u_int16_t mains[6];
u_int8_t main;
int i;
main = probenc(0x01);
mains[0] = probew(0x02);
mains[1] = probew(0x03);
mains[2] = probew(0x04); /* read Low Limit */
if (probew(0x07) != mains[2] || probew(0x07) != mains[2])
return (0);
mains[3] = probew(0x05); /* read High limit */
mains[4] = probew(0x06);
mains[5] = probew(0x07);
if (mains[4] != mains[3] || mains[5] != mains[3])
return (0);
#ifdef I2C_DEBUG
printf("lm75probe: %02x %04x %04x %04x %04x %04x %04x\n", main,
mains[0], mains[1], mains[2], mains[3], mains[4], mains[5]);
#endif /* I2C_DEBUG */
/* a real lm75/77 repeats it's registers.... */
for (i = 0x08; i < 0xff; i += 8) {
if (main != probenc(0x01 + i) ||
mains[0] != probew(0x02 + i) ||
mains[1] != probew(0x03 + i) ||
mains[2] != probew(0x04 + i) ||
mains[3] != probew(0x05 + i) ||
mains[4] != probew(0x06 + i) ||
mains[5] != probew(0x07 + i))
return (0);
}
/* We hope */
return (1);
}
#ifdef __i386__
static char *xeonprobe(u_int8_t);
static char *
xeonprobe(u_int8_t addr)
{
if (addr == 0x18 || addr == 0x1a || addr == 0x29 ||
addr == 0x2b || addr == 0x4c || addr == 0x4e) {
u_int8_t reg, val;
int zero = 0;
for (reg = 0x00; reg < 0x09; reg++) {
if (probe(reg) == 0xff)
return (NULL);
if (probe(reg) == 0)
zero++;
}
if (zero > 8)
return (NULL);
val = probe(0x09);
for (reg = 0x0a; reg < 0xfe; reg++) {
if (probe(reg) != val)
return (NULL);
}
/* 0xfe may be maxim, or some other vendor */
if (probe(0xfe) == 0x4d)
return ("maxim1617");
return ("xeontemp");
}
return (NULL);
}
#endif
void
iic_probe(struct device *self, struct i2cbus_attach_args *iba, u_int8_t addr)
{
struct i2c_attach_args ia;
char *name = NULL;
#ifdef I2C_DEBUG
int i;
#endif /* I2C_DEBUG */
probeinit(iba, addr);
switch (probe(0x3e)) {
case 0x41:
/*
* Analog Devices adt/adm product code at 0x3e == 0x41.
* Newer chips have a valid 0x3d product number, while
* older ones sometimes encoded the product into the
* upper half of the "step register" at 0x3f
*/
if (probe(0x3d) == 0x76 &&
(addr == 0x2c || addr == 0x2d || addr == 0x2e))
name = "adt7476";
else if ((addr == 0x2c || addr == 0x2e || addr == 0x2f) &&
probe(0x3d) == 0x70)
name = "adt7470";
else if (probe(0x3d) == 0x27 &&
(probe(0x3f) == 0x62 || probe(0x3f) == 0x6a))
name = "adt7460"; /* complete check */
else if (probe(0x3d) == 0x68 && addr == 0x2e &&
(probe(0x3f) & 0xf0) == 0x70)
name = "adt7467";
else if (probe(0x3d) == 0x33)
name = "adm1033";
else if ((addr & 0x7c) == 0x2c && /* addr 0b01011xx */
probe(0x3d) == 0x30 &&
(probe(0x3f) & 0x70) == 0x00 &&
(probe(0x01) & 0x4a) == 0x00 &&
(probe(0x03) & 0x3f) == 0x00 &&
(probe(0x22) & 0xf0) == 0x00 &&
(probe(0x0d) & 0x70) == 0x00 &&
(probe(0x0e) & 0x70) == 0x00)
name = "adm1030"; /* complete check */
else if ((addr & 0x7c) == 0x2c && /* addr 0b01011xx */
probe(0x3d) == 0x31 &&
(probe(0x03) & 0x3f) == 0x00 &&
(probe(0x0d) & 0x70) == 0x00 &&
(probe(0x0e) & 0x70) == 0x00 &&
(probe(0x0f) & 0x70) == 0x00)
name = "adm1031"; /* complete check */
else if ((addr & 0x7c) == 0x2c && /* addr 0b01011xx */
(probe(0x3f) & 0xf0) == 0x20 &&
(probe(0x40) & 0x80) == 0x00 &&
(probe(0x41) & 0xc0) == 0x00 &&
(probe(0x42) & 0xbc) == 0x00)
name = "adm1025"; /* complete check */
else if ((addr & 0x7c) == 0x2c && /* addr 0b01011xx */
(probe(0x3f) & 0xf0) == 0x10 &&
(probe(0x40) & 0x80) == 0x00)
name = "adm1024"; /* complete check */
else if ((probe(0xff) & 0xf0) == 0x30)
name = "adm1023";
else if ((probe(0x3f) & 0xf0) == 0xd0 && addr == 0x2e &&
(probe(0x40) & 0x80) == 0x00)
name = "adm1028"; /* adm1022 clone? */
else if ((probe(0x3f) & 0xf0) == 0xc0 &&
(addr == 0x2c || addr == 0x2e || addr == 0x2f) &&
(probe(0x40) & 0x80) == 0x00)
name = "adm1022";
break;
case 0xa1:
/* Philips vendor code 0xa1 at 0x3e */
if ((probe(0x3f) & 0xf0) == 0x20 &&
(probe(0x40) & 0x80) == 0x00 &&
(probe(0x41) & 0xc0) == 0x00 &&
(probe(0x42) & 0xbc) == 0x00)
name = "ne1619"; /* adm1025 compat */
break;
case 0x23: /* 2nd ADM id? */
if (probe(0x48) == addr &&
(probe(0x40) & 0x80) == 0x00 &&
(addr & 0x7c) == 0x2c)
name = "adm9240"; /* lm87 clone */
break;
case 0x55:
if (probe(0x3f) == 0x20 && (probe(0x47) & 0x70) == 0x00 &&
(probe(0x49) & 0xfe) == 0x80 &&
(addr & 0x7c) == 0x2c)
name = "47m192"; /* adm1025 compat */
break;
case 0x01:
/*
* Most newer National products use a vendor code at
* 0x3e of 0x01, and then 0x3f contains a product code
* But some older products are missing a product code,
* and contain who knows what in that register. We assume
* that some employee was smart enough to keep the numbers
* unique.
*/
if (probe(0x3f) == 0x52 && probe(0xff) == 0x01 &&
(probe(0xfe) == 0x4c || probe(0xfe) == 0x4d))
name = "lm89";
else if (probe(0x3f) == 0x33 && probe(0xff) == 0x01 &&
probe(0xfe) == 0x21)
name = "lm90";
else if (probe(0x3f) == 0x49 && probe(0xff) == 0x01 &&
(probe(0xfe) == 0x31 || probe(0xfe) == 0x34))
name = "lm99"; /* and lm99-1 */
else if (probe(0x3f) == 0x73)
name = "lm93";
else if (probe(0x3f) == 0x17)
name = "lm86";
else if ((probe(0x3f) & 0xf0) == 0x60 &&
(addr == 0x2c || addr == 0x2d || addr == 0x2e))
name = "lm85"; /* adt7460 compat */
else if (probe(0x3f) == 0x03 && probe(0x48) == addr &&
((probe(0x40) & 0x80) == 0x00) && ((addr & 0x7c) == 0x2c))
name = "lm81";
break;
case 0x49: /* TI */
if ((probe(0x3f) & 0xf0) == 0xc0 &&
(addr == 0x2c || addr == 0x2e || addr == 0x2f) &&
(probe(0x40) & 0x80) == 0x00)
name = "thmc50"; /* adm1022 clone */
break;
case 0x5c: /* SMSC */
if ((probe(0x3f) & 0xf0) == 0x60 &&
(addr == 0x2c || addr == 0x2d || addr == 0x2e))
name = "emc6d10x"; /* adt7460 compat */
break;
case 0x02:
if ((probe(0x3f) & 0xfc) == 0x04)
name = "lm87"; /* complete check */
break;
case 0xda:
if (probe(0x3f) == 0x01 && probe(0x48) == addr &&
(probe(0x40) & 0x80) == 0x00)
name = "ds1780"; /* lm87 clones */
break;
}
switch (probe(0x4e)) {
case 0x41:
if ((addr == 0x48 || addr == 0x4a || addr == 0x4b) &&
/* addr 0b1001{000, 010, 011} */
(probe(0x4d) == 0x03 || probe(0x4d) == 0x08 ||
probe(0x4d) == 0x07))
name = "adt7516"; /* adt7517, adt7519 */
break;
}
if (probe(0xfe) == 0x01) {
/* Some more National devices ...*/
if (probe(0xff) == 0x33)
name = "lm90";
} else if (probe(0xfe) == 0x4d && probe(0xff) == 0x08) {
name = "maxim6690"; /* somewhat similar to lm90 */
} else if (probe(0xfe) == 0x41 && probe(0x3c) == 0x00 &&
(addr == 0x18 || addr == 0x19 || addr == 0x1a ||
addr == 0x29 || addr == 0x2a || addr == 0x2b ||
addr == 0x4c || addr == 0x4d || addr == 0x4e)) {
name = "adm1021"; /* lots of addresses... bleah */
} else if (probe(0x4f) == 0x5c && (probe(0x4e) & 0x80)) {
/*
* We should toggle 0x4e bit 0x80, then re-read
* 0x4f to see if it is 0xa3 (for Winbond)
*/
if (probe(0x58) == 0x31)
name = "as99127f";
} else if (probe(0x16) == 0x41 && ((probe(0x17) & 0xf0) == 0x40) &&
(addr == 0x2c || addr == 0x2d || addr == 0x2e)) {
name = "adm1026";
} else if ((addr & 0xfc) == 0x48 && lm75probe()) {
name = "lm75";
#ifdef __i386__
} else if (name == NULL) {
name = xeonprobe(addr);
#endif
}
#ifdef I2C_DEBUG
printf("%s: addr 0x%x", self->dv_xname, addr);
// for (i = 0; i < sizeof(probereg); i++)
// if (probe(probereg[i]) != 0xff)
// printf(" %02x=%02x", probereg[i], probe(probereg[i]));
for (i = 0; i <= 0xff; i++)
if (probe(i) != 0xff)
printf(" %02x=%02x", i, probe(i));
if (name)
printf(": %s", name);
printf("\n");
#endif /* I2C_DEBUG */
if (name) {
ia.ia_tag = iba->iba_tag;
ia.ia_addr = addr;
ia.ia_size = 1;
ia.ia_name = name;
config_found(self, &ia, iic_print);
}
}
void
iic_scan(struct device *self, struct i2cbus_attach_args *iba)
{
i2c_tag_t ic = iba->iba_tag;
u_int8_t cmd = 0, addr;
int i;
for (i = 0; i < sizeof(probe_addrs)/sizeof(probe_addrs[0]); i++) {
for (addr = probe_addrs[i].start; addr <= probe_addrs[i].end;
addr++) {
/* Perform RECEIVE BYTE command */
ic->ic_acquire_bus(ic->ic_cookie, I2C_F_POLL);
if (iic_exec(ic, I2C_OP_READ_WITH_STOP, addr,
&cmd, 1, NULL, 0, I2C_F_POLL) == 0) {
ic->ic_release_bus(ic->ic_cookie, I2C_F_POLL);
/* Some device exists, so go scope it out */
iic_probe(self, iba, addr);
ic->ic_acquire_bus(ic->ic_cookie, I2C_F_POLL);
}
ic->ic_release_bus(ic->ic_cookie, I2C_F_POLL);
}
}
}
|