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[PATCH v4 1/2] wire: export w1_touch_bit

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Changes in v4 against v3 in this subpatch:
  - adapted to linux-4.12.0

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

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 <jjj@gmx.de>
---
From 6aedd1b890bd77bfe788f6af7a38724c16934ab0 Mon Sep 17 00:00:00 2001
From: Jan Kandziora <jjj@gmx.de>
Date: Sat, 8 Jul 2017 21:14:27 +0200
Subject: [PATCH 1/2] wire: export w1_touch_bit

---
 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;
 	}
 }
+EXPORT_SYMBOL_GPL(w1_touch_bit);
  /**
  * w1_write_bit() - Generates a write-0 or write-1 cycle.
-- 
2.13.1

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[PATCH v4 1/2] wire: export w1_touch_bit Jan Kandziora <jjj@gmx.de> - 2017-07-11 01:10 +0200
  Re: [PATCH v4 1/2] wire: export w1_touch_bit Evgeniy Polyakov <zbr@ioremap.net> - 2017-07-13 17:20 +0200
    Re: [PATCH v4 1/2] wire: export w1_touch_bit Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-07-17 16:50 +0200
      Re: [PATCH v4 1/2] wire: export w1_touch_bit Jan Kandziora <jjj@gmx.de> - 2017-07-18 01:00 +0200
        Re: [PATCH v4 1/2] wire: export w1_touch_bit Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-07-18 07:00 +0200

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