static int ht16k33_probe()

in ht16k33.c [713:776]

• 51 lines of code
• 13 McCabe index (conditional complexity)

static int ht16k33_probe(struct i2c_client *client)
{
	struct device *dev = &client->dev;
	const struct of_device_id *id;
	struct ht16k33_priv *priv;
	uint32_t dft_brightness;
	int err;

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
		dev_err(dev, "i2c_check_functionality error\n");
		return -EIO;
	}

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	priv->client = client;
	id = i2c_of_match_device(dev->driver->of_match_table, client);
	if (id)
		priv->type = (uintptr_t)id->data;
	i2c_set_clientdata(client, priv);

	err = ht16k33_initialize(priv);
	if (err)
		return err;

	err = device_property_read_u32(dev, "default-brightness-level",
				       &dft_brightness);
	if (err) {
		dft_brightness = MAX_BRIGHTNESS;
	} else if (dft_brightness > MAX_BRIGHTNESS) {
		dev_warn(dev,
			 "invalid default brightness level: %u, using %u\n",
			 dft_brightness, MAX_BRIGHTNESS);
		dft_brightness = MAX_BRIGHTNESS;
	}

	/* LED */
	err = ht16k33_led_probe(dev, &priv->led, dft_brightness);
	if (err)
		return err;

	/* Keypad */
	if (client->irq > 0) {
		err = ht16k33_keypad_probe(client, &priv->keypad);
		if (err)
			return err;
	}

	switch (priv->type) {
	case DISP_MATRIX:
		/* Frame Buffer Display */
		err = ht16k33_fbdev_probe(dev, priv, dft_brightness);
		break;

	case DISP_QUAD_7SEG:
	case DISP_QUAD_14SEG:
		/* Segment Display */
		err = ht16k33_seg_probe(dev, priv, dft_brightness);
		break;
	}
	return err;
}