mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-01 06:33:07 +00:00
w1: w1_therm: fixes w1_seq for ds28ea00 sensors
[ Upstream commit 41a92a89ee
]
w1_seq was failing due to several devices responding to the
CHAIN_DONE at the same time. Now properly selects the current
device in the chain with MATCH_ROM. Also acknowledgment was
read twice.
Signed-off-by: Lucas Denefle <lucas.denefle@converge.io>
Link: https://lore.kernel.org/r/20220223113558.232750-1-lucas.denefle@converge.io
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
parent
a861234d57
commit
aba111deed
1 changed files with 6 additions and 2 deletions
|
@ -690,16 +690,20 @@ static ssize_t w1_seq_show(struct device *device,
|
|||
if (sl->reg_num.id == reg_num->id)
|
||||
seq = i;
|
||||
|
||||
if (w1_reset_bus(sl->master))
|
||||
goto error;
|
||||
|
||||
/* Put the device into chain DONE state */
|
||||
w1_write_8(sl->master, W1_MATCH_ROM);
|
||||
w1_write_block(sl->master, (u8 *)&rn, 8);
|
||||
w1_write_8(sl->master, W1_42_CHAIN);
|
||||
w1_write_8(sl->master, W1_42_CHAIN_DONE);
|
||||
w1_write_8(sl->master, W1_42_CHAIN_DONE_INV);
|
||||
w1_read_block(sl->master, &ack, sizeof(ack));
|
||||
|
||||
/* check for acknowledgment */
|
||||
ack = w1_read_8(sl->master);
|
||||
if (ack != W1_42_SUCCESS_CONFIRM_BYTE)
|
||||
goto error;
|
||||
|
||||
}
|
||||
|
||||
/* Exit from CHAIN state */
|
||||
|
|
Loading…
Reference in a new issue