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Date:   Mon, 18 Sep 2017 15:03:45 +0200
From:   Jan Kandziora <>
To:     GregKH <>, LKML <>
Cc:     Evgeniy Polyakov <>,
        Linux-I2C <>
Subject: [PATCH v4 1/2] wire: export w1_touch_bit

The w1_ds28e17 driver from the next part of this patch needs to emit
single-bit read timeslots to the DS28E17. The w1 subsystem already
has this function but it is not exported outside drivers/w1/w1_io.c

This subpatch exports the w1_touch_bit symbol with EXPORT_SYMBOL_GPL,
same as the other exported symbols in drivers/w1/w1_io.c

May be also useful later for writing drivers for other Onewire chips
which do single-bit communication.

Signed-off-by: Jan Kandziora <>
Changes in v4 against v3 in this subpatch:
  - adapted to linux-4.12.0

No changes in v3 against v2,v1 in this subpatch.

 drivers/w1/w1.h    | 1 +
 drivers/w1/w1_io.c | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/w1/w1.h b/drivers/w1/w1.h
index 758a7a6..e7af855 100644
--- a/drivers/w1/w1.h
+++ b/drivers/w1/w1.h
@@ -295,6 +295,7 @@ int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn);
 int w1_slave_detach(struct w1_slave *sl);
 u8 w1_triplet(struct w1_master *dev, int bdir);
+u8 w1_touch_bit(struct w1_master *dev, int bit);
 void w1_write_8(struct w1_master *, u8);
 u8 w1_read_8(struct w1_master *);
 int w1_reset_bus(struct w1_master *);
diff --git a/drivers/w1/w1_io.c b/drivers/w1/w1_io.c
index 1134e6b..4bb77a1 100644
--- a/drivers/w1/w1_io.c
+++ b/drivers/w1/w1_io.c
@@ -58,7 +58,7 @@ static u8 w1_read_bit(struct w1_master *dev);
  * @dev:	the master device
  * @bit:	0 - write a 0, 1 - write a 0 read the level
-static u8 w1_touch_bit(struct w1_master *dev, int bit)
+u8 w1_touch_bit(struct w1_master *dev, int bit)
 	if (dev->bus_master->touch_bit)
 		return dev->bus_master->touch_bit(dev->bus_master->data, bit);
@@ -69,6 +69,7 @@ static u8 w1_touch_bit(struct w1_master *dev, int bit)
 		return 0;
  * w1_write_bit() - Generates a write-0 or write-1 cycle.

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