From: Fabrice Gasnier <fabrice.gasnier@st.com>
To: <jic23@kernel.org>
Cc: <linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, <mcoquelin.stm32@gmail.com>,
<alexandre.torgue@st.com>, <fabrice.gasnier@st.com>,
<linux-iio@vger.kernel.org>, <lars@metafoo.de>, <knaack.h@gmx.de>,
<pmeerw@pmeerw.net>, <linux-stm32@st-md-mailman.stormreply.com>,
<arnaud.pouliquen@st.com>, <olivier.moysan@st.com>
Subject: [PATCH 8/8] iio: adc: stm32-dfsdm: claim direct mode for raw read and settings
Date: Wed, 6 Mar 2019 09:55:24 +0100 [thread overview]
Message-ID: <1551862524-25098-9-git-send-email-fabrice.gasnier@st.com> (raw)
In-Reply-To: <1551862524-25098-1-git-send-email-fabrice.gasnier@st.com>
Claim direct mode to ensure no buffer mode is in use for:
- single conversion
- sample rate setting (must be set when filter isn't enabled).
- oversampling ratio (must be set when filter isn't enabled).
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
---
drivers/iio/adc/stm32-dfsdm-adc.c | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/drivers/iio/adc/stm32-dfsdm-adc.c b/drivers/iio/adc/stm32-dfsdm-adc.c
index 51688eb..ca42946 100644
--- a/drivers/iio/adc/stm32-dfsdm-adc.c
+++ b/drivers/iio/adc/stm32-dfsdm-adc.c
@@ -1039,16 +1039,23 @@ static int stm32_dfsdm_write_raw(struct iio_dev *indio_dev,
switch (mask) {
case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+ ret = iio_device_claim_direct_mode(indio_dev);
+ if (ret)
+ return ret;
ret = stm32_dfsdm_set_osrs(fl, 0, val);
if (!ret)
adc->oversamp = val;
-
+ iio_device_release_direct_mode(indio_dev);
return ret;
case IIO_CHAN_INFO_SAMP_FREQ:
if (!val)
return -EINVAL;
+ ret = iio_device_claim_direct_mode(indio_dev);
+ if (ret)
+ return ret;
+
switch (ch->src) {
case DFSDM_CHANNEL_SPI_CLOCK_INTERNAL:
spi_freq = adc->dfsdm->spi_master_freq;
@@ -1070,9 +1077,11 @@ static int stm32_dfsdm_write_raw(struct iio_dev *indio_dev,
if (ret < 0) {
dev_err(&indio_dev->dev,
"Not able to find parameter that match!\n");
+ iio_device_release_direct_mode(indio_dev);
return ret;
}
adc->sample_freq = val;
+ iio_device_release_direct_mode(indio_dev);
return 0;
}
@@ -1089,11 +1098,15 @@ static int stm32_dfsdm_read_raw(struct iio_dev *indio_dev,
switch (mask) {
case IIO_CHAN_INFO_RAW:
+ ret = iio_device_claim_direct_mode(indio_dev);
+ if (ret)
+ return ret;
ret = iio_hw_consumer_enable(adc->hwc);
if (ret < 0) {
dev_err(&indio_dev->dev,
"%s: IIO enable failed (channel %d)\n",
__func__, chan->channel);
+ iio_device_release_direct_mode(indio_dev);
return ret;
}
ret = stm32_dfsdm_single_conv(indio_dev, chan, val);
@@ -1102,8 +1115,10 @@ static int stm32_dfsdm_read_raw(struct iio_dev *indio_dev,
dev_err(&indio_dev->dev,
"%s: Conversion failed (channel %d)\n",
__func__, chan->channel);
+ iio_device_release_direct_mode(indio_dev);
return ret;
}
+ iio_device_release_direct_mode(indio_dev);
return IIO_VAL_INT;
case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
--
2.7.4
prev parent reply other threads:[~2019-03-06 8:56 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-06 8:55 [PATCH 0/8] iio: adc: stm32-dfsdm: add buffer modes Fabrice Gasnier
2019-03-06 8:55 ` [PATCH 1/8] iio: adc: stm32-dfsdm: make spi_master_freq more accurate Fabrice Gasnier
2019-03-10 10:09 ` Jonathan Cameron
2019-03-21 13:41 ` Fabrice Gasnier
2019-03-06 8:55 ` [PATCH 2/8] iio: adc: stm32-dfsdm: continuous mode depends on current mode Fabrice Gasnier
2019-03-06 8:55 ` [PATCH 3/8] iio: adc: stm32-dfsdm: move dma enable from start_conv() to start_dma() Fabrice Gasnier
2019-03-06 8:55 ` [PATCH 4/8] iio: adc: stm32-dfsdm: move dma slave config to start routine Fabrice Gasnier
2019-03-06 8:55 ` [PATCH 5/8] iio: adc: stm32-dfsdm: enable hw consumer Fabrice Gasnier
2019-03-06 8:55 ` [PATCH 6/8] iio: adc: stm32-dfsdm: add support for scan mode Fabrice Gasnier
2019-03-06 8:55 ` [PATCH 7/8] iio: adc: stm32-dfsdm: add support for buffer modes Fabrice Gasnier
2019-03-10 10:21 ` Jonathan Cameron
2019-03-15 18:01 ` Fabrice Gasnier
2019-03-16 14:10 ` Jonathan Cameron
2019-03-21 13:41 ` Fabrice Gasnier
2019-03-06 8:55 ` Fabrice Gasnier [this message]
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