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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>
This commit is contained in:
Akinobu Mita 2017-07-21 00:24:19 +09:00 committed by Jonathan Cameron
parent 8d0e8e7956
commit e8245c6835
1 changed files with 7 additions and 0 deletions
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7
drivers/iio/adc/ti-ads1015.c
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@ -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;