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wire: export w1_touch_bit

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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>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jan Kandziora 2017-09-20 23:52:45 +02:00 committed by Greg Kroah-Hartman
parent e701c67c30
commit eb8470db8b
2 changed files with 3 additions and 1 deletions
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3
drivers/w1/w1_io.c
View File

@ -58,7 +58,7 @@ static u8 w1_read_bit(struct w1_master *dev);
* @dev: the master device * @dev: the master device
* @bit: 0 - write a 0, 1 - write a 0 read the level * @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) if (dev->bus_master->touch_bit)
return dev->bus_master->touch_bit(dev->bus_master->data, 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; return 0;
} }
} }
EXPORT_SYMBOL_GPL(w1_touch_bit);
/** /**
* w1_write_bit() - Generates a write-0 or write-1 cycle. * w1_write_bit() - Generates a write-0 or write-1 cycle.

1
include/linux/w1.h
View File

@ -293,6 +293,7 @@ void w1_unregister_family(struct w1_family *family);
w1_unregister_family) w1_unregister_family)
u8 w1_triplet(struct w1_master *dev, int bdir); 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); void w1_write_8(struct w1_master *, u8);
u8 w1_read_8(struct w1_master *); u8 w1_read_8(struct w1_master *);
int w1_reset_bus(struct w1_master *); int w1_reset_bus(struct w1_master *);