Commit c9cbf558 authored Dec 10, 2011 by Evgeniy Polyakov Committed by Greg Kroah-Hartman Dec 09, 2011

w1: add fast search for single slave bus



This enables a much more efficient way of device searching. It uses the
1-wire read-rom operation which allows the direct reading of the slave
address. BUT this works only with exactly one slave on the bus.

Signed-off-by: Hubert Feurstein <h.feurstein@gmail.com>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>

index c374978..9761950 100644
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

parent 74099b18

drivers/w1/w1.c

+10 −0

Original line number	Diff line number	Diff line
		@@ -892,6 +892,16 @@ void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb
		break;
		}

		/* Do fast search on single slave bus */
		if (dev->max_slave_count == 1) {
		w1_write_8(dev, W1_READ_ROM);

		if (w1_read_block(dev, (u8 *)&rn, 8) == 8 && rn)
		cb(dev, rn);

		break;
		}

		/* Start the search */
		w1_write_8(dev, search_type);
		for (i = 0; i < 64; ++i) {