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i2c_probe: update for use in scripting

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Allow the use of an I2C address to test and return success
if one or more devices is found.

This allows device presence to alter the flow of a script.
e.g.
   if i2c probe 0x04 ; then
	echo found Hannstar touch ;
   fi

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
This commit is contained in:
Eric Nelson 2012-09-23 10:12:56 +00:00 committed by Heiko Schocher
parent ff5d2dce1e
commit 54b99e51ab
1 changed files with 16 additions and 4 deletions
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20
common/cmd_i2c.c
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@ -605,18 +605,28 @@ mod_i2c_mem(cmd_tbl_t *cmdtp, int incrflag, int flag, int argc, char * const arg
/*
* Syntax:
* i2c probe {addr}{.0, .1, .2}
* i2c probe {addr}
*
* Returns zero (success) if one or more I2C devices was found
*/
static int do_i2c_probe (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
int j;
int addr = -1;
int found = 0;
#if defined(CONFIG_SYS_I2C_NOPROBES)
int k, skip;
uchar bus = GET_BUS_NUM;
#endif /* NOPROBES */
if (argc == 2)
addr = simple_strtol(argv[1], 0, 16);
puts ("Valid chip addresses:");
for (j = 0; j < 128; j++) {
if ((0 <= addr) && (j != addr))
continue;
#if defined(CONFIG_SYS_I2C_NOPROBES)
skip = 0;
for (k=0; k < NUM_ELEMENTS_NOPROBE; k++) {
@ -628,8 +638,10 @@ static int do_i2c_probe (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv
if (skip)
continue;
#endif
if (i2c_probe(j) == 0)
if (i2c_probe(j) == 0) {
printf(" %02X", j);
found++;
}
}
putc ('\n');
@ -642,7 +654,7 @@ static int do_i2c_probe (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv
putc ('\n');
#endif
return 0;
return (0 == found);
}
/*
@ -1380,7 +1392,7 @@ U_BOOT_CMD(
"i2c mm chip address[.0, .1, .2] - write to I2C device (auto-incrementing)\n"
"i2c mw chip address[.0, .1, .2] value [count] - write to I2C device (fill)\n"
"i2c nm chip address[.0, .1, .2] - write to I2C device (constant address)\n"
"i2c probe - show devices on the I2C bus\n"
"i2c probe [address] - test for and show device(s) on the I2C bus\n"
"i2c read chip address[.0, .1, .2] length memaddress - read to memory \n"
"i2c write memaddress chip address[.0, .1, .2] length - write memory to i2c\n"
"i2c reset - re-init the I2C Controller\n"