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path: root/drivers/w1/slaves/w1_ds2408.c
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Diffstat (limited to 'drivers/w1/slaves/w1_ds2408.c')
-rw-r--r--drivers/w1/slaves/w1_ds2408.c25
1 files changed, 15 insertions, 10 deletions
diff --git a/drivers/w1/slaves/w1_ds2408.c b/drivers/w1/slaves/w1_ds2408.c
index 441ad3a3b586..e45eca1044bd 100644
--- a/drivers/w1/slaves/w1_ds2408.c
+++ b/drivers/w1/slaves/w1_ds2408.c
@@ -178,6 +178,15 @@ static ssize_t w1_f29_write_output(
w1_write_block(sl->master, w1_buf, 3);
readBack = w1_read_8(sl->master);
+
+ if (readBack != W1_F29_SUCCESS_CONFIRM_BYTE) {
+ if (w1_reset_resume_command(sl->master))
+ goto error;
+ /* try again, the slave is ready for a command */
+ continue;
+ }
+
+#ifdef CONFIG_W1_SLAVE_DS2408_READBACK
/* here the master could read another byte which
would be the PIO reg (the actual pin logic state)
since in this driver we don't know which pins are
@@ -186,11 +195,6 @@ static ssize_t w1_f29_write_output(
if (w1_reset_resume_command(sl->master))
goto error;
- if (readBack != 0xAA) {
- /* try again, the slave is ready for a command */
- continue;
- }
-
/* go read back the output latches */
/* (the direct effect of the write above) */
w1_buf[0] = W1_F29_FUNC_READ_PIO_REGS;
@@ -198,7 +202,9 @@ static ssize_t w1_f29_write_output(
w1_buf[2] = 0;
w1_write_block(sl->master, w1_buf, 3);
/* read the result of the READ_PIO_REGS command */
- if (w1_read_8(sl->master) == *buf) {
+ if (w1_read_8(sl->master) == *buf)
+#endif
+ {
/* success! */
mutex_unlock(&sl->master->bus_mutex);
dev_dbg(&sl->dev,
@@ -297,8 +303,7 @@ error:
-#define NB_SYSFS_BIN_FILES 6
-static struct bin_attribute w1_f29_sysfs_bin_files[NB_SYSFS_BIN_FILES] = {
+static struct bin_attribute w1_f29_sysfs_bin_files[] = {
{
.attr = {
.name = "state",
@@ -357,7 +362,7 @@ static int w1_f29_add_slave(struct w1_slave *sl)
int err = 0;
int i;
- for (i = 0; i < NB_SYSFS_BIN_FILES && !err; ++i)
+ for (i = 0; i < ARRAY_SIZE(w1_f29_sysfs_bin_files) && !err; ++i)
err = sysfs_create_bin_file(
&sl->dev.kobj,
&(w1_f29_sysfs_bin_files[i]));
@@ -371,7 +376,7 @@ static int w1_f29_add_slave(struct w1_slave *sl)
static void w1_f29_remove_slave(struct w1_slave *sl)
{
int i;
- for (i = NB_SYSFS_BIN_FILES - 1; i >= 0; --i)
+ for (i = ARRAY_SIZE(w1_f29_sysfs_bin_files) - 1; i >= 0; --i)
sysfs_remove_bin_file(&sl->dev.kobj,
&(w1_f29_sysfs_bin_files[i]));
}