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/* $OpenBSD: i2c_scan.c,v 1.11 2005/12/23 21:23:43 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>
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[] = {
{ 0x20, 0x2f },
{ 0x48, 0x4f }
};
/* registers to load by default */
u_int8_t probereg[] = { 0x3d, 0x3e, 0x3f, 0xfe, 0xff, 0x4e, 0x4f };
#define P_3d 0
#define P_3e 1
#define P_3f 2
#define P_fe 3
#define P_ff 4
#define P_4e 5
#define P_4f 6
u_int8_t probeval[sizeof(probereg)/sizeof(probereg[0])];
/* additional registers to load later, for debugging... */
u_int8_t fprobereg[] = {
0x00, 0x01, 0x02, 0x03, 0x07, 0x4c, 0x4d, 0x4e, 0x4f, 0x58
};
#define Pf_00 0
#define Pf_01 1
#define Pf_02 2
#define Pf_03 3
#define Pf_07 4
#define Pf_4c 5
#define Pf_4d 6
#define Pf_4e 7
#define Pf_4f 8
#define Pf_58 9
u_int8_t fprobeval[sizeof(fprobereg)/sizeof(fprobereg[0])];
void
iic_probe(struct device *self, struct i2cbus_attach_args *iba, u_int8_t addr)
{
struct i2c_attach_args ia;
i2c_tag_t ic = iba->iba_tag;
char *name = NULL;
u_int8_t data;
int i;
/* Load registers used by many vendors as vendor/ID */
ic->ic_acquire_bus(ic->ic_cookie, I2C_F_POLL);
for (i = 0; i < sizeof(probereg); i++) {
probeval[i] = 0xff;
if (ic->ic_exec(ic->ic_cookie,
I2C_OP_READ_WITH_STOP, addr,
&probereg[i], 1, &data, 1,
I2C_F_POLL) == 0)
probeval[i] = data;
}
ic->ic_release_bus(ic->ic_cookie, I2C_F_POLL);
if (probeval[P_3e] == 0x41) {
/*
* Analog Devices adt/adm product code at 0x3e == 0x41.
* We probe newer to older. newer chips have a valid 0x3d
* product number, while older ones encoded the product
* into the upper half of the step at 0x3f
*/
if (probeval[P_3d] == 0x03 || probeval[P_3d] == 0x08 ||
probeval[P_3d] == 0x07)
name = "adt7516"; /* adt7517, adt7519 */
if (probeval[P_3d] == 0x76)
name = "adt7476";
else if (probeval[P_3d] == 0x70)
name = "adt7470";
else if (probeval[P_3d] == 0x27)
name = "adt7460"; /* adt746x */
else if (probeval[P_3d] == 0x33)
name = "adm1033";
else if (probeval[P_3d] == 0x30)
name = "adm1030";
else if ((probeval[P_3f] & 0xf0) == 0x20)
name = "adm1025";
else if ((probeval[P_ff] & 0xf0) == 0x10)
name = "adm1024";
else if ((probeval[P_ff] & 0xf0) == 0x30)
name = "adm1023";
else if ((probeval[P_ff] & 0xf0) == 0x90)
name = "adm1022";
else
name = "adm1021"; /* getting desperate.. */
} else if (probeval[P_3e] == 0xa1) {
/* Philips vendor code 0xa1 at 0x3e */
if ((probeval[P_3f] & 0xf0) == 0x20)
name = "ne1619"; /* adm1025 compat */
} else if (probeval[P_3e] == 0x55) {
if (probeval[P_3f] == 0x20)
name = "47m192"; /* adm1025 compat */
} else if (probeval[P_3e] == 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 (probeval[P_3f] == 0x49)
name = "lm99";
else if (probeval[P_3f] == 0x73)
name = "lm93";
else if (probeval[P_3f] == 0x33)
name = "lm90";
else if (probeval[P_3f] == 0x52)
name = "lm89";
else if (probeval[P_3f] == 0x17)
name = "lm86";
else if (probeval[P_3f] == 0x03) /* are there others? */
name = "lm81";
} else if (probeval[P_fe] == 0x01) {
/* Some more National devices ...*/
if (probeval[P_ff] == 0x33)
name = "lm90";
} else if (probeval[P_3e] == 0x02 && probeval[P_3f] == 0x6) {
name = "lm87";
} else if (probeval[P_fe] == 0x4d && probeval[P_ff] == 0x08) {
name = "maxim6690"; /* somewhat similar to lm90 */
} else if ((addr & 0xfc) == 0x48) {
/* address for lm75/77 ... */
}
printf("%s: addr 0x%x", self->dv_xname, addr);
for (i = 0; i < sizeof(probeval); i++)
if (probeval[i] != 0xff)
printf(" %02x=%02x", probereg[i], probeval[i]);
if (name)
goto gotname;
printf(",");
/* print out some more test register values.... */
ic->ic_acquire_bus(ic->ic_cookie, I2C_F_POLL);
for (i = 0; i < sizeof(fprobereg); i++) {
fprobeval[i] = 0xff;
if (ic->ic_exec(ic->ic_cookie,
I2C_OP_READ_WITH_STOP, addr, &fprobereg[i],
1, &data, 1, I2C_F_POLL) == 0 &&
data != 0xff) {
fprobeval[i] = data;
printf(" %02x=%02x", fprobereg[i], data);
}
}
ic->ic_release_bus(ic->ic_cookie, I2C_F_POLL);
if (probeval[P_4f] == 0x5c && (probeval[P_4e] & 0x80)) {
/*
* We should toggle 0x4e bit 0x80, then re-read
* 0x4f to see if it is 0xa3 (for Winbond)
*/
if (fprobeval[Pf_58] == 0x31)
name = "as99127f";
}
gotname:
if (name)
printf(": %s", name);
printf("\n");
if (name) {
ia.ia_tag = iba->iba_tag;
ia.ia_addr = addr;
ia.ia_size = 1;
ia.ia_name = name;
ia.ia_compat = 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 (ic->ic_exec(ic->ic_cookie, 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);
}
}
}
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