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gpio: add more error checking for mraa_gpio_context

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Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
This commit is contained in:
Brendan Le Foll
2014-10-03 12:00:11 +01:00
parent c5c5c9b700
commit 6d5a3d796c
2 changed files with 10 additions and 4 deletions
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11
src/gpio/gpio.c
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@@ -430,6 +430,9 @@ mraa_gpio_dir(mraa_gpio_context dev, gpio_dir_t dir)
int
mraa_gpio_read(mraa_gpio_context dev)
{
if (dev == NULL)
return -1;
if (dev->value_fp == -1) {
if (mraa_gpio_get_valfp(dev) != MRAA_SUCCESS) {
syslog(LOG_ERR, "Failed to get value file pointer");
@@ -442,17 +445,19 @@ mraa_gpio_read(mraa_gpio_context dev)
char bu[2];
if (read(dev->value_fp, bu, 2*sizeof(char)) != 2) {
syslog(LOG_ERR, "Failed to read a sensible value from sysfs");
return -1;
}
lseek(dev->value_fp, 0, SEEK_SET);
int ret = strtol(bu, NULL, 10);
return ret;
return 0;
return strtol(bu, NULL, 10);
}
mraa_result_t
mraa_gpio_write(mraa_gpio_context dev, int value)
{
if (dev == NULL)
return MRAA_ERROR_INVALID_HANDLE;
if (dev->mmap == 1)
return mraa_gpio_write_register(dev,value);