diff options
| author | Miquel Raynal <miquel.raynal@bootlin.com> | 2021-09-21 14:53:58 +0300 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2021-10-19 10:27:33 +0300 |
| commit | eaf57d50c675eb52bae6531e336a31677fd028de (patch) | |
| tree | d2d14427677a72bd0bd7f4fe1530ec84a7c56e13 /drivers/iio/adc/max1027.c | |
| parent | 4201519a1769ef5c05959b7b272ca5c239982bd5 (diff) | |
| download | linux-eaf57d50c675eb52bae6531e336a31677fd028de.tar.xz | |
iio: adc: max1027: Create a helper to enable/disable the cnvst trigger
There are two ways to physically trigger a conversion:
- A falling edge on the cnvst pin
- A write operation on the conversion register
Let's create a helper for this.
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20210921115408.66711-7-miquel.raynal@bootlin.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio/adc/max1027.c')
| -rw-r--r-- | drivers/iio/adc/max1027.c | 41 |
1 files changed, 25 insertions, 16 deletions
diff --git a/drivers/iio/adc/max1027.c b/drivers/iio/adc/max1027.c index 94e096d03b7e..ad0ca63212cb 100644 --- a/drivers/iio/adc/max1027.c +++ b/drivers/iio/adc/max1027.c @@ -272,6 +272,25 @@ struct max1027_state { u8 reg ____cacheline_aligned; }; +static int max1027_enable_trigger(struct iio_dev *indio_dev, bool enable) +{ + struct max1027_state *st = iio_priv(indio_dev); + + st->reg = MAX1027_SETUP_REG | MAX1027_REF_MODE2; + + /* + * Start acquisition on: + * MODE0: external hardware trigger wired to the cnvst input pin + * MODE2: conversion register write + */ + if (enable) + st->reg |= MAX1027_CKS_MODE0; + else + st->reg |= MAX1027_CKS_MODE2; + + return spi_write(st->spi, &st->reg, 1); +} + static int max1027_read_single_value(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val) @@ -284,14 +303,9 @@ static int max1027_read_single_value(struct iio_dev *indio_dev, return -EBUSY; } - /* Start acquisition on conversion register write */ - st->reg = MAX1027_SETUP_REG | MAX1027_REF_MODE2 | MAX1027_CKS_MODE2; - ret = spi_write(st->spi, &st->reg, 1); - if (ret < 0) { - dev_err(&indio_dev->dev, - "Failed to configure setup register\n"); + ret = max1027_enable_trigger(indio_dev, false); + if (ret) return ret; - } /* Configure conversion register with the requested chan */ st->reg = MAX1027_CONV_REG | MAX1027_CHAN(chan->channel) | @@ -397,11 +411,8 @@ static int max1027_set_cnvst_trigger_state(struct iio_trigger *trig, bool state) int ret; if (state) { - /* Start acquisition on cnvst */ - st->reg = MAX1027_SETUP_REG | MAX1027_CKS_MODE0 | - MAX1027_REF_MODE2; - ret = spi_write(st->spi, &st->reg, 1); - if (ret < 0) + ret = max1027_enable_trigger(indio_dev, state); + if (ret) return ret; /* @@ -418,10 +429,8 @@ static int max1027_set_cnvst_trigger_state(struct iio_trigger *trig, bool state) return ret; } else { /* Start acquisition on conversion register write */ - st->reg = MAX1027_SETUP_REG | MAX1027_CKS_MODE2 | - MAX1027_REF_MODE2; - ret = spi_write(st->spi, &st->reg, 1); - if (ret < 0) + ret = max1027_enable_trigger(indio_dev, state); + if (ret) return ret; } |