iio: adc: ti-ads1015: enable conversion when CONFIG_PM is not set

The ADS1015 device have two operating modes, continuous conversion mode
and single-shot mode.  This driver assumes that the continuous conversion
mode is selected by runtime resume callback when the ADC result is
requested.

If CONFIG_PM is disabled, the device is always in the default single-shot
mode and no one begins a single conversion.  So the conversion register
doesn't contain valid ADC result.  Fix it by changing the continuous mode
in probe function.

Cc: Daniel Baluta <daniel.baluta@gmail.com>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/adc/ti-ads1015.c b/drivers/iio/adc/ti-ads1015.c
index 9c17a97c110706521d08a141872b4f4b44f6013c..9d77e837c09b5c2cd5e563d27261b8afa8ea4aa7 100644 (file)
--- a/drivers/iio/adc/ti-ads1015.c
+++ b/drivers/iio/adc/ti-ads1015.c
@@ -623,6 +623,13 @@ static int ads1015_probe(struct i2c_client *client,
                dev_err(&client->dev, "iio triggered buffer setup failed\n");
                return ret;
        }
+
+       ret = regmap_update_bits(data->regmap, ADS1015_CFG_REG,
+                               ADS1015_CFG_MOD_MASK,
+                               ADS1015_CONTINUOUS << ADS1015_CFG_MOD_SHIFT);
+       if (ret)
+               return ret;
+
        ret = pm_runtime_set_active(&client->dev);
        if (ret)
                goto err_buffer_cleanup;