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authorDavid Fries <David@Fries.net>2014-01-15 22:29:24 -0600
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-02-07 15:40:18 -0800
commiteb2c0da4ac2f4614b0bd3a1b6a0e9b82d0802e08 (patch)
tree014d00301649ca8720db7168ebca51e810ad6793 /drivers
parentd53f0a2c0574e6414dceeec59ae5a9e749bd058b (diff)
downloadlwn-eb2c0da4ac2f4614b0bd3a1b6a0e9b82d0802e08.tar.gz
lwn-eb2c0da4ac2f4614b0bd3a1b6a0e9b82d0802e08.zip
w1: use family_data instead of rom in w1_slave
The first line printed from w1_slave gives the context of the w1 device. So does the second line, but if the CRC check failed, the second line contains the last successful result. It is confusing when it prints the temperature next to the line that might be a previous conversion and has nothing to do with that printed temperature value. Modify the code to store the last good conversion in family_data, which is designed for custom data structures. Signed-off-by: David Fries <David@Fries.net> Acked-by: Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/w1/slaves/w1_therm.c21
-rw-r--r--drivers/w1/w1.h1
2 files changed, 19 insertions, 3 deletions
diff --git a/drivers/w1/slaves/w1_therm.c b/drivers/w1/slaves/w1_therm.c
index 8b5ff33f72cf..1f11a20a8ab9 100644
--- a/drivers/w1/slaves/w1_therm.c
+++ b/drivers/w1/slaves/w1_therm.c
@@ -27,6 +27,7 @@
#include <linux/sched.h>
#include <linux/device.h>
#include <linux/types.h>
+#include <linux/slab.h>
#include <linux/delay.h>
#include "../w1.h"
@@ -58,6 +59,19 @@ MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS28EA00));
static int w1_strong_pullup = 1;
module_param_named(strong_pullup, w1_strong_pullup, int, 0);
+static int w1_therm_add_slave(struct w1_slave *sl)
+{
+ sl->family_data = kzalloc(9, GFP_KERNEL);
+ if (!sl->family_data)
+ return -ENOMEM;
+ return 0;
+}
+
+static void w1_therm_remove_slave(struct w1_slave *sl)
+{
+ kfree(sl->family_data);
+ sl->family_data = NULL;
+}
static ssize_t w1_slave_show(struct device *device,
struct device_attribute *attr, char *buf);
@@ -71,6 +85,8 @@ static struct attribute *w1_therm_attrs[] = {
ATTRIBUTE_GROUPS(w1_therm);
static struct w1_family_ops w1_therm_fops = {
+ .add_slave = w1_therm_add_slave,
+ .remove_slave = w1_therm_remove_slave,
.groups = w1_therm_groups,
};
@@ -253,12 +269,13 @@ static ssize_t w1_slave_show(struct device *device,
c -= snprintf(buf + PAGE_SIZE - c, c, ": crc=%02x %s\n",
crc, (verdict) ? "YES" : "NO");
if (verdict)
- memcpy(sl->rom, rom, sizeof(sl->rom));
+ memcpy(sl->family_data, rom, sizeof(rom));
else
dev_warn(device, "Read failed CRC check\n");
for (i = 0; i < 9; ++i)
- c -= snprintf(buf + PAGE_SIZE - c, c, "%02x ", sl->rom[i]);
+ c -= snprintf(buf + PAGE_SIZE - c, c, "%02x ",
+ ((u8 *)sl->family_data)[i]);
c -= snprintf(buf + PAGE_SIZE - c, c, "t=%d\n",
w1_convert_temp(rom, sl->family->fid));
diff --git a/drivers/w1/w1.h b/drivers/w1/w1.h
index 390a7307fb41..0eb50502f63f 100644
--- a/drivers/w1/w1.h
+++ b/drivers/w1/w1.h
@@ -67,7 +67,6 @@ struct w1_slave
struct list_head w1_slave_entry;
struct w1_reg_num reg_num;
atomic_t refcnt;
- u8 rom[9];
int ttl;
unsigned long flags;