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iio: initial API and enumeration of devices

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Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
This commit is contained in:
Brendan Le Foll
2015-09-28 16:26:53 +01:00
parent 0f312545e0
commit d920d136ea
4 changed files with 95 additions and 12 deletions
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30
src/iio/iio.c
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@@ -28,20 +28,36 @@
mraa_iio_context
mraa_iio_init(int device)
{
mraa_iio_context dev = (mraa_iio_context) calloc(1, sizeof(struct _iio));
if (dev == NULL) {
syslog(LOG_CRIT, "iio: Failed to allocate memory for context");
if (device > plat->iio_device_count) {
return NULL;
}
return dev;
return &plat->iio_devices[device];
}
int
mraa_iio_get_channel_count(mraa_iio_context dev)
{
return 1;
}
mraa_result_t
mraa_iio_read(mraa_iio_context dev, uint32_t* data, int length)
mraa_iio_read(mraa_iio_context dev, int channel, const char* attribute, float* data)
{
return 0;
char buf[64];
snprintf(buf, 64, "/sys/bus/iio/devices/iio:device%d/in_voltage%d_%s", dev->num, channel, attribute);
int fd = open(buf, O_RDONLY);
if (fd != -1) {
int len = read(fd, &buf, 64);
*data = strtol(buf, NULL, 10);
return MRAA_SUCCESS;
}
return MRAA_ERROR_UNSPECIFIED;
}
mraa_result_t
mraa_iio_write(mraa_iio_context dev, int channel, const char* attribute)
{
return MRAA_ERROR_FEATURE_NOT_IMPLEMENTED;
}
mraa_result_t