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| author | Evgeniy Polyakov <zbr@ioremap.net> | 2009-01-07 18:09:01 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-08 08:31:13 -0800 |
| commit | 9be62e0b2fadaf5ffeb32fd1b910ef1fe6bd43db (patch) | |
| tree | 86d39cd9790a83275380d5f37495d76888c3153b /drivers/w1/w1_io.c | |
| parent | 610705e780395ef30a1b8e53de150c37381ca31f (diff) | |
| download | linux-9be62e0b2fadaf5ffeb32fd1b910ef1fe6bd43db.tar.gz linux-9be62e0b2fadaf5ffeb32fd1b910ef1fe6bd43db.tar.bz2 linux-9be62e0b2fadaf5ffeb32fd1b910ef1fe6bd43db.zip | |
w1: add touch block command
Writes and returns sampled data back to userspace.
Signed-off-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_io.c')
| -rw-r--r-- | drivers/w1/w1_io.c | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/drivers/w1/w1_io.c b/drivers/w1/w1_io.c index 5139c25ca962..442bd8bbd4a5 100644 --- a/drivers/w1/w1_io.c +++ b/drivers/w1/w1_io.c @@ -238,7 +238,6 @@ EXPORT_SYMBOL_GPL(w1_read_8); * @param dev the master device * @param buf pointer to the data to write * @param len the number of bytes to write - * @return the byte read */ void w1_write_block(struct w1_master *dev, const u8 *buf, int len) { @@ -256,6 +255,31 @@ void w1_write_block(struct w1_master *dev, const u8 *buf, int len) EXPORT_SYMBOL_GPL(w1_write_block); /** + * Touches a series of bytes. + * + * @param dev the master device + * @param buf pointer to the data to write + * @param len the number of bytes to write + */ +void w1_touch_block(struct w1_master *dev, u8 *buf, int len) +{ + int i, j; + u8 tmp; + + for (i = 0; i < len; ++i) { + tmp = 0; + for (j = 0; j < 8; ++j) { + if (j == 7) + w1_pre_write(dev); + tmp |= w1_touch_bit(dev, (buf[i] >> j) & 0x1) << j; + } + + buf[i] = tmp; + } +} +EXPORT_SYMBOL_GPL(w1_touch_block); + +/** * Reads a series of bytes. * * @param dev the master device |