[PATCH] hwmon: soften lm75 initialization

The LM75 initialization is a bit agressive, it arbitrarily reconfigures
the chip. Make it only change the bit it needs. This is a port from
the 2.4 kernel version of the driver (lm_sensors).

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c
index 5be164ed278e..79d7ebc9b14a 100644
--- a/drivers/hwmon/lm75.c
+++ b/drivers/hwmon/lm75.c
@@ -251,8 +251,12 @@ static int lm75_write_value(struct i2c_client *client, u8 reg, u16 value)
 
 static void lm75_init_client(struct i2c_client *client)
 {
-        /* Initialize the LM75 chip */
-        lm75_write_value(client, LM75_REG_CONF, 0);
+        int reg;
+
+        /* Enable if in shutdown mode */
+        reg = lm75_read_value(client, LM75_REG_CONF);
+        if (reg >= 0 && (reg & 0x01))
+                lm75_write_value(client, LM75_REG_CONF, reg & 0xfe);
 }
 
 static struct lm75_data *lm75_update_device(struct device *dev)