diff options
| author | Evgeny Boger <boger@contactless.ru> | 2014-01-23 15:56:18 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-01-23 16:37:04 -0800 |
| commit | 3089a4c8d3abc7e2ab105d1d39d415110d1566d6 (patch) | |
| tree | 5064f69853949cb8b5d245c932f65a3202d21219 /drivers/w1/w1_int.c | |
| parent | 63509beaf7ed7a9dc8c574be61189fce791489f0 (diff) | |
drivers/w1/masters/w1-gpio.c: add strong pullup emulation
Strong pullup is emulated by driving pin logic high after write command
when using tri-state push-pull GPIO.
Signed-off-by: Evgeny Boger <boger@contactless.ru>
Cc: Greg KH <greg@kroah.com>
Acked-by: David Fries <david@fries.net>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/w1/w1_int.c')
| -rw-r--r-- | drivers/w1/w1_int.c | 12 |
1 files changed, 0 insertions, 12 deletions
diff --git a/drivers/w1/w1_int.c b/drivers/w1/w1_int.c index 5a98649f6abc..590bd8a7cd1b 100644 --- a/drivers/w1/w1_int.c +++ b/drivers/w1/w1_int.c @@ -117,18 +117,6 @@ int w1_add_master_device(struct w1_bus_master *master) printk(KERN_ERR "w1_add_master_device: invalid function set\n"); return(-EINVAL); } - /* While it would be electrically possible to make a device that - * generated a strong pullup in bit bang mode, only hardware that - * controls 1-wire time frames are even expected to support a strong - * pullup. w1_io.c would need to support calling set_pullup before - * the last write_bit operation of a w1_write_8 which it currently - * doesn't. - */ - if (!master->write_byte && !master->touch_bit && master->set_pullup) { - printk(KERN_ERR "w1_add_master_device: set_pullup requires " - "write_byte or touch_bit, disabling\n"); - master->set_pullup = NULL; - } /* Lock until the device is added (or not) to w1_masters. */ mutex_lock(&w1_mlock); |