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 --- drivers/gpio/pca953x.c | 49 ++++++++++++++++++++++++++++++++++------------- 1 files changed, 35 insertions(+), 14 deletions(-)

diff --git a/drivers/gpio/pca953x.c b/drivers/gpio/pca953x.c index 64c7797..be13745 100644 --- a/drivers/gpio/pca953x.c +++ b/drivers/gpio/pca953x.c @@ -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(