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w1: add touch block command

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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>
This commit is contained in:
Evgeniy Polyakov
2009-01-07 18:09:01 -08:00
committed by Linus Torvalds
parent 610705e780
commit 9be62e0b2f
4 changed files with 35 additions and 4 deletions
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26
drivers/w1/w1_io.c
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@@ -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)
{
@@ -255,6 +254,31 @@ 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.
*