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| author | Wolfgang Wiedmeyer <wolfgit@wiedmeyer.de> | 2015-10-23 13:30:20 +0200 |
|---|---|---|
| committer | Wolfgang Wiedmeyer <wolfgit@wiedmeyer.de> | 2015-10-23 13:30:20 +0200 |
| commit | e7549b926dd3ceec048f5689df90d4ec970c9419 (patch) | |
| tree | c8645e0b4343c309aac1a3838a17cfcf0893d7b5 /drivers/w1/w1_io.c | |
| parent | 499ba610c2829adafbf393c2f3773d73ae4445f3 (diff) | |
| download | kernel_samsung_smdk4412-e7549b926dd3ceec048f5689df90d4ec970c9419.zip kernel_samsung_smdk4412-e7549b926dd3ceec048f5689df90d4ec970c9419.tar.gz kernel_samsung_smdk4412-e7549b926dd3ceec048f5689df90d4ec970c9419.tar.bz2 | |
more driver stuff from 3.2.72
Diffstat (limited to 'drivers/w1/w1_io.c')
| -rw-r--r-- | drivers/w1/w1_io.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/w1/w1_io.c b/drivers/w1/w1_io.c index 8e8b64c..3135b2c 100644 --- a/drivers/w1/w1_io.c +++ b/drivers/w1/w1_io.c @@ -1,7 +1,7 @@ /* * w1_io.c * - * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru> + * Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net> * * * This program is free software; you can redistribute it and/or modify @@ -158,13 +158,18 @@ EXPORT_SYMBOL_GPL(w1_write_8); static u8 w1_read_bit(struct w1_master *dev) { int result; + unsigned long flags; + /* sample timing is critical here */ + local_irq_save(flags); dev->bus_master->write_bit(dev->bus_master->data, 0); w1_delay(6); dev->bus_master->write_bit(dev->bus_master->data, 1); w1_delay(9); result = dev->bus_master->read_bit(dev->bus_master->data); + local_irq_restore(flags); + w1_delay(55); return result & 0x1; |