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Subject[PATCH] iio: stm32-adc: keep a reference to the iio device on the state struct
Date
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@analog.com>
---
drivers/iio/adc/stm32-adc.c | 27 +++++++++++++++------------
1 file changed, 15 insertions(+), 12 deletions(-)

diff --git a/drivers/iio/adc/stm32-adc.c b/drivers/iio/adc/stm32-adc.c
index ae622ee6d08c..7e58c4443e3f 100644
--- a/drivers/iio/adc/stm32-adc.c
+++ b/drivers/iio/adc/stm32-adc.c
@@ -171,6 +171,7 @@ struct stm32_adc_cfg {

/**
* struct stm32_adc - private data of each ADC IIO instance
+ * @indio_dev: back-reference to the IIO device object
* @common: reference to ADC block common data
* @offset: ADC instance register offset in ADC block
* @cfg: compatible configuration data
@@ -194,6 +195,7 @@ struct stm32_adc_cfg {
* @chan_name: channel name array
*/
struct stm32_adc {
+ struct iio_dev *indio_dev;
struct stm32_adc_common *common;
u32 offset;
const struct stm32_adc_cfg *cfg;
@@ -637,7 +639,7 @@ static void stm32h7_adc_start_conv(struct stm32_adc *adc, bool dma)

static void stm32h7_adc_stop_conv(struct stm32_adc *adc)
{
- struct iio_dev *indio_dev = iio_priv_to_dev(adc);
+ struct iio_dev *indio_dev = adc->indio_dev;
int ret;
u32 val;

@@ -654,7 +656,7 @@ static void stm32h7_adc_stop_conv(struct stm32_adc *adc)

static int stm32h7_adc_exit_pwr_down(struct stm32_adc *adc)
{
- struct iio_dev *indio_dev = iio_priv_to_dev(adc);
+ struct iio_dev *indio_dev = adc->indio_dev;
int ret;
u32 val;

@@ -692,7 +694,7 @@ static void stm32h7_adc_enter_pwr_down(struct stm32_adc *adc)

static int stm32h7_adc_enable(struct stm32_adc *adc)
{
- struct iio_dev *indio_dev = iio_priv_to_dev(adc);
+ struct iio_dev *indio_dev = adc->indio_dev;
int ret;
u32 val;

@@ -715,7 +717,7 @@ static int stm32h7_adc_enable(struct stm32_adc *adc)

static void stm32h7_adc_disable(struct stm32_adc *adc)
{
- struct iio_dev *indio_dev = iio_priv_to_dev(adc);
+ struct iio_dev *indio_dev = adc->indio_dev;
int ret;
u32 val;

@@ -735,7 +737,7 @@ static void stm32h7_adc_disable(struct stm32_adc *adc)
*/
static int stm32h7_adc_read_selfcalib(struct stm32_adc *adc)
{
- struct iio_dev *indio_dev = iio_priv_to_dev(adc);
+ struct iio_dev *indio_dev = adc->indio_dev;
int i, ret;
u32 lincalrdyw_mask, val;

@@ -779,7 +781,7 @@ static int stm32h7_adc_read_selfcalib(struct stm32_adc *adc)
*/
static int stm32h7_adc_restore_selfcalib(struct stm32_adc *adc)
{
- struct iio_dev *indio_dev = iio_priv_to_dev(adc);
+ struct iio_dev *indio_dev = adc->indio_dev;
int i, ret;
u32 lincalrdyw_mask, val;

@@ -852,7 +854,7 @@ static int stm32h7_adc_restore_selfcalib(struct stm32_adc *adc)
*/
static int stm32h7_adc_selfcalib(struct stm32_adc *adc)
{
- struct iio_dev *indio_dev = iio_priv_to_dev(adc);
+ struct iio_dev *indio_dev = adc->indio_dev;
int ret;
u32 val;

@@ -1228,7 +1230,7 @@ static int stm32_adc_read_raw(struct iio_dev *indio_dev,
static irqreturn_t stm32_adc_threaded_isr(int irq, void *data)
{
struct stm32_adc *adc = data;
- struct iio_dev *indio_dev = iio_priv_to_dev(adc);
+ struct iio_dev *indio_dev = adc->indio_dev;
const struct stm32_adc_regspec *regs = adc->cfg->regs;
u32 status = stm32_adc_readl(adc, regs->isr_eoc.reg);

@@ -1241,7 +1243,7 @@ static irqreturn_t stm32_adc_threaded_isr(int irq, void *data)
static irqreturn_t stm32_adc_isr(int irq, void *data)
{
struct stm32_adc *adc = data;
- struct iio_dev *indio_dev = iio_priv_to_dev(adc);
+ struct iio_dev *indio_dev = adc->indio_dev;
const struct stm32_adc_regspec *regs = adc->cfg->regs;
u32 status = stm32_adc_readl(adc, regs->isr_eoc.reg);

@@ -1879,6 +1881,7 @@ static int stm32_adc_probe(struct platform_device *pdev)
return -ENOMEM;

adc = iio_priv(indio_dev);
+ adc->indio_dev = indio_dev;
adc->common = dev_get_drvdata(pdev->dev.parent);
spin_lock_init(&adc->lock);
init_completion(&adc->completion);
@@ -1990,7 +1993,7 @@ static int stm32_adc_probe(struct platform_device *pdev)
static int stm32_adc_remove(struct platform_device *pdev)
{
struct stm32_adc *adc = platform_get_drvdata(pdev);
- struct iio_dev *indio_dev = iio_priv_to_dev(adc);
+ struct iio_dev *indio_dev = adc->indio_dev;

pm_runtime_get_sync(&pdev->dev);
iio_device_unregister(indio_dev);
@@ -2013,7 +2016,7 @@ static int stm32_adc_remove(struct platform_device *pdev)
static int stm32_adc_suspend(struct device *dev)
{
struct stm32_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_adc_buffer_predisable(indio_dev);
@@ -2024,7 +2027,7 @@ static int stm32_adc_suspend(struct device *dev)
static int stm32_adc_resume(struct device *dev)
{
struct stm32_adc *adc = dev_get_drvdata(dev);
- struct iio_dev *indio_dev = iio_priv_to_dev(adc);
+ struct iio_dev *indio_dev = adc->indio_dev;
int ret;

ret = pm_runtime_force_resume(dev);
--
2.25.1
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