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iio: adc: max1027: Make it optional to use interrupts

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The chip has a 'start conversion' and a 'end of conversion' pair of
pins. They can be used but this is absolutely not mandatory as regular
polling of the value is totally fine with the current internal
clocking setup. Turn the interrupts optional and do not error out if
they are not inquired in the device tree. This has the effect to
prevent triggered buffers use though.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Miquel Raynal 2019-10-11 16:43:41 +02:00 committed by Jonathan Cameron
parent 038696f8bd
commit ffae106764
1 changed files with 31 additions and 26 deletions
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57
drivers/iio/adc/max1027.c
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@ -430,35 +430,40 @@ static int max1027_probe(struct spi_device *spi)
return -ENOMEM;
}
ret = devm_iio_triggered_buffer_setup(&spi->dev, indio_dev,
&iio_pollfunc_store_time,
&max1027_trigger_handler, NULL);
if (ret < 0) {
dev_err(&indio_dev->dev, "Failed to setup buffer\n");
return ret;
}
if (spi->irq) {
ret = devm_iio_triggered_buffer_setup(&spi->dev, indio_dev,
&iio_pollfunc_store_time,
&max1027_trigger_handler,
NULL);
if (ret < 0) {
dev_err(&indio_dev->dev, "Failed to setup buffer\n");
return ret;
}
st->trig = devm_iio_trigger_alloc(&spi->dev, "%s-trigger",
indio_dev->name);
if (st->trig == NULL) {
ret = -ENOMEM;
dev_err(&indio_dev->dev, "Failed to allocate iio trigger\n");
return ret;
}
st->trig = devm_iio_trigger_alloc(&spi->dev, "%s-trigger",
indio_dev->name);
if (st->trig == NULL) {
ret = -ENOMEM;
dev_err(&indio_dev->dev,
"Failed to allocate iio trigger\n");
return ret;
}
st->trig->ops = &max1027_trigger_ops;
st->trig->dev.parent = &spi->dev;
iio_trigger_set_drvdata(st->trig, indio_dev);
iio_trigger_register(st->trig);
st->trig->ops = &max1027_trigger_ops;
st->trig->dev.parent = &spi->dev;
iio_trigger_set_drvdata(st->trig, indio_dev);
iio_trigger_register(st->trig);
ret = devm_request_threaded_irq(&spi->dev, spi->irq,
iio_trigger_generic_data_rdy_poll,
NULL,
IRQF_TRIGGER_FALLING,
spi->dev.driver->name, st->trig);
if (ret < 0) {
dev_err(&indio_dev->dev, "Failed to allocate IRQ.\n");
return ret;
ret = devm_request_threaded_irq(&spi->dev, spi->irq,
iio_trigger_generic_data_rdy_poll,
NULL,
IRQF_TRIGGER_FALLING,
spi->dev.driver->name,
st->trig);
if (ret < 0) {
dev_err(&indio_dev->dev, "Failed to allocate IRQ.\n");
return ret;
}
}
/* Disable averaging */