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Date: Fri, 22 May 2020 16:08:04 +0300
From: Alexandru Ardelean <alexandru.ardelean@...log.com>
To: <linux-iio@...r.kernel.org>,
<linux-stm32@...md-mailman.stormreply.com>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>
CC: <jic23@...nel.org>, <mcoquelin.stm32@...il.com>,
<alexandre.torgue@...com>,
Alexandru Ardelean <alexandru.ardelean@...log.com>
Subject: [PATCH] iio: stm32-dfsdm-adc: keep a reference to the iio device on the state struct
We may want to get rid of the iio_priv_to_dev() helper. The reason is that
we will hide some of the members of the iio_dev structure (to prevent
drivers from accessing them directly), and that will also mean hiding the
implementation of the iio_priv_to_dev() helper inside the IIO core.
Hiding the implementation of iio_priv_to_dev() implies that some fast-paths
may not be fast anymore, so a general idea is to try to get rid of the
iio_priv_to_dev() altogether.
The iio_priv() helper won't be affected by the rework.
For this driver, not using iio_priv_to_dev(), means keeping a reference to
the IIO device on the state struct.
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
---
drivers/iio/adc/stm32-dfsdm-adc.c | 20 +++++++++++---------
1 file changed, 11 insertions(+), 9 deletions(-)
diff --git a/drivers/iio/adc/stm32-dfsdm-adc.c b/drivers/iio/adc/stm32-dfsdm-adc.c
index 76a60d93fe23..ff7a6afa4558 100644
--- a/drivers/iio/adc/stm32-dfsdm-adc.c
+++ b/drivers/iio/adc/stm32-dfsdm-adc.c
@@ -69,6 +69,7 @@ struct stm32_dfsdm_dev_data {
struct stm32_dfsdm_adc {
struct stm32_dfsdm *dfsdm;
+ struct iio_dev *indio_dev;
const struct stm32_dfsdm_dev_data *dev_data;
unsigned int fl_id;
unsigned int nconv;
@@ -332,7 +333,7 @@ static int stm32_dfsdm_compute_all_osrs(struct iio_dev *indio_dev,
static int stm32_dfsdm_start_channel(struct stm32_dfsdm_adc *adc)
{
- struct iio_dev *indio_dev = iio_priv_to_dev(adc);
+ struct iio_dev *indio_dev = adc->indio_dev;
struct regmap *regmap = adc->dfsdm->regmap;
const struct iio_chan_spec *chan;
unsigned int bit;
@@ -352,7 +353,7 @@ static int stm32_dfsdm_start_channel(struct stm32_dfsdm_adc *adc)
static void stm32_dfsdm_stop_channel(struct stm32_dfsdm_adc *adc)
{
- struct iio_dev *indio_dev = iio_priv_to_dev(adc);
+ struct iio_dev *indio_dev = adc->indio_dev;
struct regmap *regmap = adc->dfsdm->regmap;
const struct iio_chan_spec *chan;
unsigned int bit;
@@ -422,7 +423,7 @@ static int stm32_dfsdm_filter_set_trig(struct stm32_dfsdm_adc *adc,
unsigned int fl_id,
struct iio_trigger *trig)
{
- struct iio_dev *indio_dev = iio_priv_to_dev(adc);
+ struct iio_dev *indio_dev = adc->indio_dev;
struct regmap *regmap = adc->dfsdm->regmap;
u32 jextsel = 0, jexten = STM32_DFSDM_JEXTEN_DISABLED;
int ret;
@@ -451,7 +452,7 @@ static int stm32_dfsdm_channels_configure(struct stm32_dfsdm_adc *adc,
unsigned int fl_id,
struct iio_trigger *trig)
{
- struct iio_dev *indio_dev = iio_priv_to_dev(adc);
+ struct iio_dev *indio_dev = adc->indio_dev;
struct regmap *regmap = adc->dfsdm->regmap;
struct stm32_dfsdm_filter *fl = &adc->dfsdm->fl_list[fl_id];
struct stm32_dfsdm_filter_osr *flo = &fl->flo[0];
@@ -495,7 +496,7 @@ static int stm32_dfsdm_filter_configure(struct stm32_dfsdm_adc *adc,
unsigned int fl_id,
struct iio_trigger *trig)
{
- struct iio_dev *indio_dev = iio_priv_to_dev(adc);
+ struct iio_dev *indio_dev = adc->indio_dev;
struct regmap *regmap = adc->dfsdm->regmap;
struct stm32_dfsdm_filter *fl = &adc->dfsdm->fl_list[fl_id];
struct stm32_dfsdm_filter_osr *flo = &fl->flo[fl->fast];
@@ -1314,7 +1315,7 @@ static const struct iio_info stm32_dfsdm_info_adc = {
static irqreturn_t stm32_dfsdm_irq(int irq, void *arg)
{
struct stm32_dfsdm_adc *adc = arg;
- struct iio_dev *indio_dev = iio_priv_to_dev(adc);
+ struct iio_dev *indio_dev = adc->indio_dev;
struct regmap *regmap = adc->dfsdm->regmap;
unsigned int status, int_en;
@@ -1569,6 +1570,7 @@ static int stm32_dfsdm_adc_probe(struct platform_device *pdev)
adc = iio_priv(iio);
adc->dfsdm = dev_get_drvdata(dev->parent);
+ adc->indio_dev = iio;
iio->dev.parent = dev;
iio->dev.of_node = np;
@@ -1651,7 +1653,7 @@ static int stm32_dfsdm_adc_probe(struct platform_device *pdev)
static int stm32_dfsdm_adc_remove(struct platform_device *pdev)
{
struct stm32_dfsdm_adc *adc = platform_get_drvdata(pdev);
- struct iio_dev *indio_dev = iio_priv_to_dev(adc);
+ struct iio_dev *indio_dev = adc->indio_dev;
if (adc->dev_data->type == DFSDM_AUDIO)
of_platform_depopulate(&pdev->dev);
@@ -1664,7 +1666,7 @@ static int stm32_dfsdm_adc_remove(struct platform_device *pdev)
static int __maybe_unused stm32_dfsdm_adc_suspend(struct device *dev)
{
struct stm32_dfsdm_adc *adc = dev_get_drvdata(dev);
- struct iio_dev *indio_dev = iio_priv_to_dev(adc);
+ struct iio_dev *indio_dev = adc->indio_dev;
if (iio_buffer_enabled(indio_dev))
__stm32_dfsdm_predisable(indio_dev);
@@ -1675,7 +1677,7 @@ static int __maybe_unused stm32_dfsdm_adc_suspend(struct device *dev)
static int __maybe_unused stm32_dfsdm_adc_resume(struct device *dev)
{
struct stm32_dfsdm_adc *adc = dev_get_drvdata(dev);
- struct iio_dev *indio_dev = iio_priv_to_dev(adc);
+ struct iio_dev *indio_dev = adc->indio_dev;
const struct iio_chan_spec *chan;
struct stm32_dfsdm_channel *ch;
int i, ret;
--
2.25.1
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