i2c-gpio: Add support for new-style clients

Use i2c_bit_add_numbered_bus() so that the i2c-gpio adapter works well
with new-style pre-declared devices.
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

drivers/i2c/busses/i2c-gpio.c

@@ -142,7 +142,13 @@ static int __init i2c_gpio_probe(struct platform_device *pdev)
 	adap->algo_data = bit_data;
 	adap->dev.parent = &pdev->dev;
 
-	ret = i2c_bit_add_bus(adap);
+	/*
+	 * If "dev->id" is negative we consider it as zero.
+	 * The reason to do so is to avoid sysfs names that only make
+	 * sense when there are multiple adapters.
+	 */
+	adap->nr = pdev->id >= 0 ? pdev->id : 0;
+	ret = i2c_bit_add_numbered_bus(adap);
 	if (ret)
 		goto err_add_bus;