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    Subject[PATCH v4 1/2] wire: export w1_touch_bit
    Date
    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>
    ---
    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;
    }
    }
    +EXPORT_SYMBOL_GPL(w1_touch_bit);

    /**
    * w1_write_bit() - Generates a write-0 or write-1 cycle.
    --
    2.13.2
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