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gpio: Report errors when GPIOs cannot be read

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Some controllers do not allow the output value to be read. Detect this and
report the error in that case.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2015-08-31 18:55:36 -06:00
parent f23baa572f
commit b71bea7129
1 changed files with 27 additions and 7 deletions
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34
cmd/gpio.c
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@ -119,7 +119,7 @@ static int do_gpio(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
unsigned int gpio;
enum gpio_cmd sub_cmd;
ulong value;
int value;
const char *str_cmd, *str_gpio = NULL;
int ret;
#ifdef CONFIG_DM_GPIO
@ -197,15 +197,35 @@ static int do_gpio(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
value = gpio_get_value(gpio);
} else {
switch (sub_cmd) {
case GPIO_SET: value = 1; break;
case GPIO_CLEAR: value = 0; break;
case GPIO_TOGGLE: value = !gpio_get_value(gpio); break;
default: goto show_usage;
case GPIO_SET:
value = 1;
break;
case GPIO_CLEAR:
value = 0;
break;
case GPIO_TOGGLE:
value = gpio_get_value(gpio);
if (!IS_ERR_VALUE(value))
value = !value;
break;
default:
goto show_usage;
}
gpio_direction_output(gpio, value);
}
printf("gpio: pin %s (gpio %i) value is %lu\n",
str_gpio, gpio, value);
printf("gpio: pin %s (gpio %i) value is ", str_gpio, gpio);
if (IS_ERR_VALUE(value))
printf("unknown (ret=%d)\n", value);
else
printf("%d\n", value);
if (sub_cmd != GPIO_INPUT && !IS_ERR_VALUE(value)) {
int nval = gpio_get_value(gpio);
if (IS_ERR_VALUE(nval))
printf(" Warning: no access to GPIO output value\n");
else if (nval != value)
printf(" Warning: value of pin is still %d\n", nval);
}
if (ret != -EBUSY)
gpio_free(gpio);