diff options
| author | Evgeniy Polyakov <johnpol@2ka.mipt.ru> | 2006-03-23 19:11:58 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-06-22 11:22:50 -0700 |
| commit | f522d2396138e68bcb9cc5650aa368a81d7f7ff0 (patch) | |
| tree | 3446d411b996b19094856c5729725e0e43ff4b0e /drivers/w1/w1.h | |
| parent | 52ab3f3dc711eeccbfbcc5d4f5c5d9b9ff59650f (diff) | |
[PATCH] w1: Added default generic read/write operations.
Special file in each w1 slave device's directory called "rw" is created
each time new slave and no appropriate w1 family is registered.
"rw" file supports read and write operations, which allows to perform
almost any kind of operations. Each logical operation is a transaction
in nature, which can contain several (two or one) low-level operations.
Let's see how one can read EEPROM context:
1. one must write control buffer, i.e. buffer containing command byte
and two byte address. At this step bus is reset and appropriate device
is selected using either W1_SKIP_ROM or W1_MATCH_ROM command.
Then provided control buffer is being written to the wire.
2. reading. This will issue reading eeprom response.
It is possible that between 1. and 2. w1 master thread will reset bus for
searching and slave device will be even removed, but in this case 0xff will
be read, since no device was selected.
Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/w1/w1.h')
| -rw-r--r-- | drivers/w1/w1.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/w1/w1.h b/drivers/w1/w1.h index 56980505e6c..02e8caddfb3 100644 --- a/drivers/w1/w1.h +++ b/drivers/w1/w1.h @@ -60,7 +60,7 @@ struct w1_reg_num #define W1_READ_PSUPPLY 0xB4 #define W1_MATCH_ROM 0x55 -#define W1_SLAVE_ACTIVE (1<<0) +#define W1_SLAVE_ACTIVE 0 struct w1_slave { |