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authorGuenter Roeck <linux@roeck-us.net>2015-05-27 16:17:19 -0700
committerGuenter Roeck <linux@roeck-us.net>2015-05-31 22:58:36 -0700
commite892b75ff579a0c07b633f2e234aeecf78a93a37 (patch)
tree65b43204fc0e584c0a8c402e9afdb7c46b01c0ef /drivers/hwmon/atxp1.c
parentea33a5e7718aa0bd2fa82ff44489ec19badf70f0 (diff)
hwmon: (atxp1) Drop auto-detection
Auto-detection for this chip is highly unreliable, and one of its I2C addresses can also be used by EEPROMs, increasing the risk for false positives even more. Drop auto-detection entirely to remove the risk. Reviewed-by: Jean Delvare <jdelvare@suse.de> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon/atxp1.c')
-rw-r--r--drivers/hwmon/atxp1.c55
1 files changed, 9 insertions, 46 deletions
diff --git a/drivers/hwmon/atxp1.c b/drivers/hwmon/atxp1.c
index 78edc56b59e5..f2f2f2fc755a 100644
--- a/drivers/hwmon/atxp1.c
+++ b/drivers/hwmon/atxp1.c
@@ -11,6 +11,10 @@
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
+ *
+ * The ATXP1 can reside on I2C addresses 0x37 or 0x4e. The chip is
+ * not auto-detected by the driver and must be instantiated explicitly.
+ * See Documentation/i2c/instantiating-devices for more information.
*/
#include <linux/kernel.h>
@@ -38,8 +42,6 @@ MODULE_AUTHOR("Sebastian Witt <se.witt@gmx.net>");
#define ATXP1_VIDMASK 0x1f
#define ATXP1_GPIO1MASK 0x0f
-static const unsigned short normal_i2c[] = { 0x37, 0x4e, I2C_CLIENT_END };
-
struct atxp1_data {
struct i2c_client *client;
struct mutex update_lock;
@@ -254,48 +256,6 @@ static struct attribute *atxp1_attrs[] = {
};
ATTRIBUTE_GROUPS(atxp1);
-/* Return 0 if detection is successful, -ENODEV otherwise */
-static int atxp1_detect(struct i2c_client *new_client,
- struct i2c_board_info *info)
-{
- struct i2c_adapter *adapter = new_client->adapter;
-
- u8 temp;
-
- if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
- return -ENODEV;
-
- /* Detect ATXP1, checking if vendor ID registers are all zero */
- if (!((i2c_smbus_read_byte_data(new_client, 0x3e) == 0) &&
- (i2c_smbus_read_byte_data(new_client, 0x3f) == 0) &&
- (i2c_smbus_read_byte_data(new_client, 0xfe) == 0) &&
- (i2c_smbus_read_byte_data(new_client, 0xff) == 0)))
- return -ENODEV;
-
- /*
- * No vendor ID, now checking if registers 0x10,0x11 (non-existent)
- * showing the same as register 0x00
- */
- temp = i2c_smbus_read_byte_data(new_client, 0x00);
-
- if (!((i2c_smbus_read_byte_data(new_client, 0x10) == temp) &&
- (i2c_smbus_read_byte_data(new_client, 0x11) == temp)))
- return -ENODEV;
-
- /* Get VRM */
- temp = vid_which_vrm();
-
- if ((temp != 90) && (temp != 91)) {
- dev_err(&adapter->dev, "atxp1: Not supporting VRM %d.%d\n",
- temp / 10, temp % 10);
- return -ENODEV;
- }
-
- strlcpy(info->type, "atxp1", I2C_NAME_SIZE);
-
- return 0;
-}
-
static int atxp1_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -309,6 +269,11 @@ static int atxp1_probe(struct i2c_client *client,
/* Get VRM */
data->vrm = vid_which_vrm();
+ if (data->vrm != 90 && data->vrm != 91) {
+ dev_err(dev, "atxp1: Not supporting VRM %d.%d\n",
+ data->vrm / 10, data->vrm % 10);
+ return -ENODEV;
+ }
data->client = client;
mutex_init(&data->update_lock);
@@ -337,8 +302,6 @@ static struct i2c_driver atxp1_driver = {
},
.probe = atxp1_probe,
.id_table = atxp1_id,
- .detect = atxp1_detect,
- .address_list = normal_i2c,
};
module_i2c_driver(atxp1_driver);