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path: root/drivers/i2c/chips/pca9539.c
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Diffstat (limited to 'drivers/i2c/chips/pca9539.c')
-rw-r--r--drivers/i2c/chips/pca9539.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/i2c/chips/pca9539.c b/drivers/i2c/chips/pca9539.c
index 54b6e6a4beed..cb22280cdd27 100644
--- a/drivers/i2c/chips/pca9539.c
+++ b/drivers/i2c/chips/pca9539.c
@@ -134,11 +134,13 @@ static int pca9539_detect(struct i2c_adapter *adapter, int address, int kind)
new_client->driver = &pca9539_driver;
new_client->flags = 0;
- /* Detection: the pca9539 only has 8 registers (0-7).
- A read of 7 should succeed, but a read of 8 should fail. */
- if ((i2c_smbus_read_byte_data(new_client, 7) < 0) ||
- (i2c_smbus_read_byte_data(new_client, 8) >= 0))
- goto exit_kfree;
+ if (kind < 0) {
+ /* Detection: the pca9539 only has 8 registers (0-7).
+ A read of 7 should succeed, but a read of 8 should fail. */
+ if ((i2c_smbus_read_byte_data(new_client, 7) < 0) ||
+ (i2c_smbus_read_byte_data(new_client, 8) >= 0))
+ goto exit_kfree;
+ }
strlcpy(new_client->name, "pca9539", I2C_NAME_SIZE);