diff options
| author | Laurence Withers <lwithers@guralp.com> | 2012-07-25 03:55:48 +0000 |
|---|---|---|
| committer | Tom Rini <trini@ti.com> | 2012-10-08 11:12:07 -0700 |
| commit | 633efe9c2356be452ab79e964e3a83d78648a62c (patch) | |
| tree | f476926d9d892058bcf455993574bb50f3baaa25 /drivers/gpio | |
| parent | d75bc03f452f952dd3c997d3b524417dd614b58b (diff) | |
| download | u-boot-imx-633efe9c2356be452ab79e964e3a83d78648a62c.zip u-boot-imx-633efe9c2356be452ab79e964e3a83d78648a62c.tar.gz u-boot-imx-633efe9c2356be452ab79e964e3a83d78648a62c.tar.bz2 | |
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>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | 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( |