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path: root/drivers/iio/accel/mma8452.c
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Diffstat (limited to 'drivers/iio/accel/mma8452.c')
-rw-r--r--drivers/iio/accel/mma8452.c22
1 files changed, 14 insertions, 8 deletions
diff --git a/drivers/iio/accel/mma8452.c b/drivers/iio/accel/mma8452.c
index 912a447e6310..c7d9ca96dbaa 100644
--- a/drivers/iio/accel/mma8452.c
+++ b/drivers/iio/accel/mma8452.c
@@ -1511,10 +1511,14 @@ static int mma8452_reset(struct i2c_client *client)
int i;
int ret;
- ret = i2c_smbus_write_byte_data(client, MMA8452_CTRL_REG2,
+ /*
+ * Find on fxls8471, after config reset bit, it reset immediately,
+ * and will not give ACK, so here do not check the return value.
+ * The following code will read the reset register, and check whether
+ * this reset works.
+ */
+ i2c_smbus_write_byte_data(client, MMA8452_CTRL_REG2,
MMA8452_CTRL_REG2_RST);
- if (ret < 0)
- return ret;
for (i = 0; i < 10; i++) {
usleep_range(100, 200);
@@ -1557,11 +1561,13 @@ static int mma8452_probe(struct i2c_client *client,
mutex_init(&data->lock);
data->chip_info = device_get_match_data(&client->dev);
- if (!data->chip_info && id) {
- data->chip_info = &mma_chip_info_table[id->driver_data];
- } else {
- dev_err(&client->dev, "unknown device model\n");
- return -ENODEV;
+ if (!data->chip_info) {
+ if (id) {
+ data->chip_info = &mma_chip_info_table[id->driver_data];
+ } else {
+ dev_err(&client->dev, "unknown device model\n");
+ return -ENODEV;
+ }
}
ret = iio_read_mount_matrix(&client->dev, &data->orientation);