diff options
Diffstat (limited to 'drivers/i2c/muxes/i2c-mux-pca954x.c')
| -rw-r--r-- | drivers/i2c/muxes/i2c-mux-pca954x.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/drivers/i2c/muxes/i2c-mux-pca954x.c b/drivers/i2c/muxes/i2c-mux-pca954x.c index d397e803b1..42bde5ed1c 100644 --- a/drivers/i2c/muxes/i2c-mux-pca954x.c +++ b/drivers/i2c/muxes/i2c-mux-pca954x.c @@ -177,7 +177,7 @@ static int pca954x_probe(struct device_d *dev) { struct i2c_client *client = to_i2c_client(dev); struct i2c_adapter *adap = to_i2c_adapter(client->dev.parent); - int num, force; + int num; struct pca954x *data; uintptr_t tmp; int ret = -ENODEV; @@ -195,10 +195,11 @@ static int pca954x_probe(struct device_d *dev) if (gpio_is_valid(gpio)) gpio_direction_output(gpio, 1); - /* Read the mux register at addr to verify - * that the mux is in fact present. + /* Write the mux register at addr to verify + * that the mux is in fact present. This also + * initializes the mux to disconnected state. */ - if (i2c_smbus_read_byte(client) < 0) { + if (i2c_smbus_write_byte(client, 0) < 0) { dev_warn(&client->dev, "probe failed\n"); goto exit_free; } @@ -220,8 +221,8 @@ static int pca954x_probe(struct device_d *dev) if (data->virt_adaps[num] == NULL) { ret = -ENODEV; dev_err(&client->dev, - "failed to register multiplexed adapter" - " %d as bus %d\n", num, force); + "failed to register multiplexed adapter%d\n", + num); goto virt_reg_failed; } } |