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| author | Evgeniy Polyakov <johnpol@2ka.mipt.ru> | 2005-08-11 17:27:49 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2005-09-08 14:41:26 -0700 |
| commit | ea7d8f65c865ebfa1d7cd67c360a87333ff013c1 (patch) | |
| tree | 1e687c32d53a92c10a61fb23ab14763459ff5779 /drivers/w1/w1_io.c | |
| parent | db2d0008de519c5db6baec45f7831e08790301cf (diff) | |
| download | lwn-ea7d8f65c865ebfa1d7cd67c360a87333ff013c1.tar.gz lwn-ea7d8f65c865ebfa1d7cd67c360a87333ff013c1.zip | |
[PATCH] w1: Added w1_reset_select_slave() - Resets the bus and then selects the slave by
sending either a skip rom or a rom match.
Patch from Ben Gardner <bgardner@wabtec.com>
Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/w1/w1_io.c')
| -rw-r--r-- | drivers/w1/w1_io.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/w1/w1_io.c b/drivers/w1/w1_io.c index 00f032220173..e2a043354ddf 100644 --- a/drivers/w1/w1_io.c +++ b/drivers/w1/w1_io.c @@ -277,6 +277,29 @@ void w1_search_devices(struct w1_master *dev, w1_slave_found_callback cb) w1_search(dev, cb); } +/** + * Resets the bus and then selects the slave by sending either a skip rom + * or a rom match. + * The w1 master lock must be held. + * + * @param sl the slave to select + * @return 0=success, anything else=error + */ +int w1_reset_select_slave(struct w1_slave *sl) +{ + if (w1_reset_bus(sl->master)) + return -1; + + if (sl->master->slave_count == 1) + w1_write_8(sl->master, W1_SKIP_ROM); + else { + u8 match[9] = {W1_MATCH_ROM, }; + memcpy(&match[1], (u8 *)&sl->reg_num, 8); + w1_write_block(sl->master, match, 9); + } + return 0; +} + EXPORT_SYMBOL(w1_touch_bit); EXPORT_SYMBOL(w1_write_8); EXPORT_SYMBOL(w1_read_8); @@ -286,3 +309,4 @@ EXPORT_SYMBOL(w1_delay); EXPORT_SYMBOL(w1_read_block); EXPORT_SYMBOL(w1_write_block); EXPORT_SYMBOL(w1_search_devices); +EXPORT_SYMBOL(w1_reset_select_slave); |