diff options
| author | Mariusz Bialonczyk <manio@skyboo.net> | 2019-05-20 10:05:55 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-24 21:21:43 +0300 |
| commit | ae2ee27aa985232f66421d7cd1c7f4b87c7dba7d (patch) | |
| tree | 7b9fcb33cf42313f8412e4291f1e143a26f5326d /drivers/w1 | |
| parent | ae29783d3333b828cdc3f9276e110db1a2f7cc4c (diff) | |
| download | linux-ae2ee27aa985232f66421d7cd1c7f4b87c7dba7d.tar.xz | |
w1: ds2413: output_write() cosmetic fixes / simplify
Make the output_write simpler.
Based on Jean-Francois Dagenais code from:
49695ac46861 ("w1: ds2408: reset on output_write retry with readback")
Signed-off-by: Mariusz Bialonczyk <manio@skyboo.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/w1')
| -rw-r--r-- | drivers/w1/slaves/w1_ds2413.c | 19 |
1 files changed, 11 insertions, 8 deletions
diff --git a/drivers/w1/slaves/w1_ds2413.c b/drivers/w1/slaves/w1_ds2413.c index 492e3d010321..cd3763df69ac 100644 --- a/drivers/w1/slaves/w1_ds2413.c +++ b/drivers/w1/slaves/w1_ds2413.c @@ -69,6 +69,7 @@ static ssize_t output_write(struct file *filp, struct kobject *kobj, struct w1_slave *sl = kobj_to_w1_slave(kobj); u8 w1_buf[3]; unsigned int retries = W1_F3A_RETRIES; + ssize_t bytes_written = -EIO; if (count != 1 || off != 0) return -EFAULT; @@ -78,7 +79,7 @@ static ssize_t output_write(struct file *filp, struct kobject *kobj, dev_dbg(&sl->dev, "mutex locked"); if (w1_reset_select_slave(sl)) - goto error; + goto out; /* according to the DS2413 datasheet the most significant 6 bits should be set to "1"s, so do it now */ @@ -91,18 +92,20 @@ static ssize_t output_write(struct file *filp, struct kobject *kobj, w1_write_block(sl->master, w1_buf, 3); if (w1_read_8(sl->master) == W1_F3A_SUCCESS_CONFIRM_BYTE) { - mutex_unlock(&sl->master->bus_mutex); - dev_dbg(&sl->dev, "mutex unlocked, retries:%d", retries); - return 1; + bytes_written = 1; + goto out; } if (w1_reset_resume_command(sl->master)) - goto error; + goto out; /* unrecoverable error */ + + dev_warn(&sl->dev, "PIO_ACCESS_WRITE error, retries left: %d\n", retries); } -error: +out: mutex_unlock(&sl->master->bus_mutex); - dev_dbg(&sl->dev, "mutex unlocked in error, retries:%d", retries); - return -EIO; + dev_dbg(&sl->dev, "%s, mutex unlocked, retries: %d\n", + (bytes_written > 0) ? "succeeded" : "error", retries); + return bytes_written; } static BIN_ATTR(output, S_IRUGO | S_IWUSR | S_IWGRP, NULL, output_write, 1); |