C++ (Cpp) g_udev_device_get_sysfs_attr_as_double Examples

Example #1

File: iio-buffer-utils.c Project: hadess/iio-sensor-proxy

/**
 * iio_fixup_sampling_frequency: Fixup devices *sampling_frequency attributes
 * @dev: the IIO device to fix the sampling frequencies for
 *
 * Make sure devices with *sampling_frequency attributes are sampling at
 * 10Hz or more. This fixes 2 problems:
 * 1) Some buffered devices default their sampling_frequency to 0Hz and then
 * never produce any readings.
 * 2) Some polled devices default to 1Hz and wait for a fresh sample before
 * returning from sysfs *_raw reads, blocking all of iio-sensor-proxy for
 * multiple seconds
 **/
gboolean
iio_fixup_sampling_frequency (GUdevDevice *dev)
{
	GDir *dir;
	const char *device_dir;
	const char *name;
	GError *error = NULL;
	double sample_freq;

	device_dir = g_udev_device_get_sysfs_path (dev);
	dir = g_dir_open (g_udev_device_get_sysfs_path (dev), 0, &error);
	if (!dir) {
		g_warning ("Failed to open directory '%s': %s", device_dir, error->message);
		g_error_free (error);
		return FALSE;
	}

	while ((name = g_dir_read_name (dir))) {
		if (g_str_has_suffix (name, "sampling_frequency") == FALSE)
			continue;

		sample_freq = g_udev_device_get_sysfs_attr_as_double (dev, name);
		if (sample_freq >= IIO_MIN_SAMPLING_FREQUENCY)
			continue; /* Continue with pre-set sample freq. */

		/* Sample freq too low, set it to 10Hz */
		if (write_sysfs_int (name, device_dir, IIO_MIN_SAMPLING_FREQUENCY) < 0)
			g_warning ("Could not fix sample-freq for %s/%s", device_dir, name);
	}
	g_dir_close (dir);
	return TRUE;
}

Example #2

File: drv-iio-poll-accel.c Project: rickysarraf/iio-sensor-proxy

static gboolean
iio_poll_accel_open (GUdevDevice        *device,
                     ReadingsUpdateFunc  callback_func,
                     gpointer            user_data)
{
    drv_data = g_new0 (DrvData, 1);
    drv_data->dev = g_object_ref (device);

    drv_data->callback_func = callback_func;
    drv_data->user_data = user_data;
    drv_data->scale = SCALE_TO_FF(g_udev_device_get_sysfs_attr_as_double (device, "in_accel_scale"));
    if (drv_data->scale == 0.0)
        drv_data->scale = 1.0;

    return TRUE;
}