hwmon: (applesmc) Handle new temperature format

The recent Macbooks have temperature registers of a new type.
This patch adds the logic to handle them.

Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>

1 files changed, 9 insertions, 3 deletions

diff --git a/drivers/hwmon/applesmc.c b/drivers/hwmon/applesmc.c
index 03c24b7c9cbd..1d7f8aff9982 100644
--- a/drivers/hwmon/applesmc.c
+++ b/drivers/hwmon/applesmc.c
@@ -734,13 +734,19 @@ static ssize_t applesmc_show_temperature(struct device *dev,
         entry = applesmc_get_entry_by_index(index);
         if (IS_ERR(entry))
                 return PTR_ERR(entry);
+        if (entry->len > 2)
+                return -EINVAL;
 
-        ret = applesmc_read_entry(entry, buffer, 2);
+        ret = applesmc_read_entry(entry, buffer, entry->len);
         if (ret)
                 return ret;
 
-        temp = buffer[0]*1000;
-        temp += (buffer[1] >> 6) * 250;
+        if (entry->len == 2) {
+                temp = buffer[0] * 1000;
+                temp += (buffer[1] >> 6) * 250;
+        } else {
+                temp = buffer[0] * 4000;
+        }
 
         return snprintf(sysfsbuf, PAGE_SIZE, "%u\n", temp);
 }