From eaf57d50c675eb52bae6531e336a31677fd028de Mon Sep 17 00:00:00 2001 From: Miquel Raynal Date: Tue, 21 Sep 2021 13:53:58 +0200 Subject: [PATCH] iio: adc: max1027: Create a helper to enable/disable the cnvst trigger MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Nuno Sá Link: https://lore.kernel.org/r/20210921115408.66711-7-miquel.raynal@bootlin.com Signed-off-by: Jonathan Cameron --- drivers/iio/adc/max1027.c | 41 +++++++++++++++++++++++++---------------- 1 file changed, 25 insertions(+), 16 deletions(-) diff --git a/drivers/iio/adc/max1027.c b/drivers/iio/adc/max1027.c index 94e096d..ad0ca63 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; } -- 2.7.4