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path: root/drivers/hwmon/lm75.c
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Diffstat (limited to 'drivers/hwmon/lm75.c')
-rw-r--r--drivers/hwmon/lm75.c40
1 files changed, 19 insertions, 21 deletions
diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c
index 638dd0586e3f..ef902d5d06ab 100644
--- a/drivers/hwmon/lm75.c
+++ b/drivers/hwmon/lm75.c
@@ -240,7 +240,7 @@ static int lm75_detect(struct i2c_client *new_client,
{
struct i2c_adapter *adapter = new_client->adapter;
int i;
- int cur, conf, hyst, os;
+ int conf, hyst, os;
bool is_lm75a = 0;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
@@ -261,8 +261,10 @@ static int lm75_detect(struct i2c_client *new_client,
register 7, and unused registers return 0xff rather than the
last read value. */
- cur = i2c_smbus_read_word_data(new_client, 0);
+ /* Unused bits */
conf = i2c_smbus_read_byte_data(new_client, 1);
+ if (conf & 0xe0)
+ return -ENODEV;
/* First check for LM75A */
if (i2c_smbus_read_byte_data(new_client, 7) == LM75A_ID) {
@@ -273,33 +275,29 @@ static int lm75_detect(struct i2c_client *new_client,
|| i2c_smbus_read_byte_data(new_client, 6) != 0xff)
return -ENODEV;
is_lm75a = 1;
- hyst = i2c_smbus_read_word_data(new_client, 2);
- os = i2c_smbus_read_word_data(new_client, 3);
+ hyst = i2c_smbus_read_byte_data(new_client, 2);
+ os = i2c_smbus_read_byte_data(new_client, 3);
} else { /* Traditional style LM75 detection */
/* Unused addresses */
- hyst = i2c_smbus_read_word_data(new_client, 2);
- if (i2c_smbus_read_word_data(new_client, 4) != hyst
- || i2c_smbus_read_word_data(new_client, 5) != hyst
- || i2c_smbus_read_word_data(new_client, 6) != hyst
- || i2c_smbus_read_word_data(new_client, 7) != hyst)
+ hyst = i2c_smbus_read_byte_data(new_client, 2);
+ if (i2c_smbus_read_byte_data(new_client, 4) != hyst
+ || i2c_smbus_read_byte_data(new_client, 5) != hyst
+ || i2c_smbus_read_byte_data(new_client, 6) != hyst
+ || i2c_smbus_read_byte_data(new_client, 7) != hyst)
return -ENODEV;
- os = i2c_smbus_read_word_data(new_client, 3);
- if (i2c_smbus_read_word_data(new_client, 4) != os
- || i2c_smbus_read_word_data(new_client, 5) != os
- || i2c_smbus_read_word_data(new_client, 6) != os
- || i2c_smbus_read_word_data(new_client, 7) != os)
+ os = i2c_smbus_read_byte_data(new_client, 3);
+ if (i2c_smbus_read_byte_data(new_client, 4) != os
+ || i2c_smbus_read_byte_data(new_client, 5) != os
+ || i2c_smbus_read_byte_data(new_client, 6) != os
+ || i2c_smbus_read_byte_data(new_client, 7) != os)
return -ENODEV;
}
- /* Unused bits */
- if (conf & 0xe0)
- return -ENODEV;
-
/* Addresses cycling */
- for (i = 8; i < 0xff; i += 8) {
+ for (i = 8; i <= 248; i += 40) {
if (i2c_smbus_read_byte_data(new_client, i + 1) != conf
- || i2c_smbus_read_word_data(new_client, i + 2) != hyst
- || i2c_smbus_read_word_data(new_client, i + 3) != os)
+ || i2c_smbus_read_byte_data(new_client, i + 2) != hyst
+ || i2c_smbus_read_byte_data(new_client, i + 3) != os)
return -ENODEV;
if (is_lm75a && i2c_smbus_read_byte_data(new_client, i + 7)
!= LM75A_ID)