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GPIO: pca953x: fix error reporting 

Use the standard CMD_RET_* constants to clearly report errors from the
pca953x command. In addition, print error messages when I2C communication
fails.

Signed-off-by: Laurence Withers <lwithers@guralp.com>
This commit is contained in:
Laurence Withers 2012-07-25 03:55:48 +00:00 committed by Tom Rini
parent d75bc03f45
commit 633efe9c23
1 changed files with 35 additions and 14 deletions
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49
drivers/gpio/pca953x.c
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@ -221,7 +221,7 @@ cmd_tbl_t cmd_pca953x[] = {
int do_pca953x(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
static uint8_t chip = CONFIG_SYS_I2C_PCA953X_ADDR;
int val;
int ret = CMD_RET_USAGE, val;
ulong ul_arg2 = 0;
ulong ul_arg3 = 0;
cmd_tbl_t *c;
@ -232,7 +232,7 @@ int do_pca953x(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
if (!c || !((argc == (c->maxargs)) ||
(((int)c->cmd == PCA953X_CMD_DEVICE) &&
(argc == (c->maxargs - 1))))) {
return cmd_usage(cmdtp);
return CMD_RET_USAGE;
}
/* arg2 used as chip number or pin number */
@ -246,32 +246,53 @@ int do_pca953x(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
switch ((int)c->cmd) {
#ifdef CONFIG_CMD_PCA953X_INFO
case PCA953X_CMD_INFO:
return pca953x_info(chip);
ret = pca953x_info(chip);
if (ret)
ret = CMD_RET_FAILURE;
break;
#endif
case PCA953X_CMD_DEVICE:
if (argc == 3)
chip = (uint8_t)ul_arg2;
printf("Current device address: 0x%x\n", chip);
return 0;
ret = CMD_RET_SUCCESS;
break;
case PCA953X_CMD_INPUT:
pca953x_set_dir(chip, (1 << ul_arg2),
ret = pca953x_set_dir(chip, (1 << ul_arg2),
PCA953X_DIR_IN << ul_arg2);
val = (pca953x_get_val(chip) & (1 << ul_arg2)) != 0;
printf("chip 0x%02x, pin 0x%lx = %d\n", chip, ul_arg2, val);
return val;
if (ret)
ret = CMD_RET_FAILURE;
else
printf("chip 0x%02x, pin 0x%lx = %d\n", chip, ul_arg2,
val);
break;
case PCA953X_CMD_OUTPUT:
pca953x_set_dir(chip, (1 << ul_arg2),
ret = pca953x_set_dir(chip, (1 << ul_arg2),
(PCA953X_DIR_OUT << ul_arg2));
return pca953x_set_val(chip, (1 << ul_arg2),
(ul_arg3 << ul_arg2));
if (!ret)
ret = pca953x_set_val(chip, (1 << ul_arg2),
(ul_arg3 << ul_arg2));
if (ret)
ret = CMD_RET_FAILURE;
break;
case PCA953X_CMD_INVERT:
return pca953x_set_pol(chip, (1 << ul_arg2),
ret = pca953x_set_pol(chip, (1 << ul_arg2),
(ul_arg3 << ul_arg2));
default:
/* We should never get here */
return 1;
if (ret)
ret = CMD_RET_FAILURE;
break;
}
if (ret == CMD_RET_FAILURE)
eprintf("Error talking to chip at 0x%x\n", chip);
return ret;
}
U_BOOT_CMD(