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SubjectRe: [PATCH v2] iio: stm32-dfsdm-adc: remove usage of iio_priv_to_dev() helper
On Mon, 25 May 2020 11:26:48 +0300
Alexandru Ardelean <alexandru.ardelean@analog.com> wrote:

> 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, as the iio_dev
> struct will keep a reference to the private information.
>
> For this driver, not using iio_priv_to_dev(), means reworking some paths to
> pass the iio device and using iio_priv() to access the private information.
>
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Looks great. Will let it sit a little longer on list for others to review
though.

Thanks,

Jonathan

> ---
>
> Changelog v1 -> v2:
> * changed some paths to pass a reference to ref to iio device and access
> private state-struct via iio_priv()
>
> drivers/iio/adc/stm32-dfsdm-adc.c | 65 ++++++++++++++++---------------
> 1 file changed, 33 insertions(+), 32 deletions(-)
>
> diff --git a/drivers/iio/adc/stm32-dfsdm-adc.c b/drivers/iio/adc/stm32-dfsdm-adc.c
> index 76a60d93fe23..03dfc0b6ba98 100644
> --- a/drivers/iio/adc/stm32-dfsdm-adc.c
> +++ b/drivers/iio/adc/stm32-dfsdm-adc.c
> @@ -330,9 +330,9 @@ static int stm32_dfsdm_compute_all_osrs(struct iio_dev *indio_dev,
> return 0;
> }
>
> -static int stm32_dfsdm_start_channel(struct stm32_dfsdm_adc *adc)
> +static int stm32_dfsdm_start_channel(struct iio_dev *indio_dev)
> {
> - struct iio_dev *indio_dev = iio_priv_to_dev(adc);
> + struct stm32_dfsdm_adc *adc = iio_priv(indio_dev);
> struct regmap *regmap = adc->dfsdm->regmap;
> const struct iio_chan_spec *chan;
> unsigned int bit;
> @@ -350,9 +350,9 @@ static int stm32_dfsdm_start_channel(struct stm32_dfsdm_adc *adc)
> return 0;
> }
>
> -static void stm32_dfsdm_stop_channel(struct stm32_dfsdm_adc *adc)
> +static void stm32_dfsdm_stop_channel(struct iio_dev *indio_dev)
> {
> - struct iio_dev *indio_dev = iio_priv_to_dev(adc);
> + struct stm32_dfsdm_adc *adc = iio_priv(indio_dev);
> struct regmap *regmap = adc->dfsdm->regmap;
> const struct iio_chan_spec *chan;
> unsigned int bit;
> @@ -418,11 +418,11 @@ static void stm32_dfsdm_stop_filter(struct stm32_dfsdm *dfsdm,
> DFSDM_CR1_DFEN_MASK, DFSDM_CR1_DFEN(0));
> }
>
> -static int stm32_dfsdm_filter_set_trig(struct stm32_dfsdm_adc *adc,
> +static int stm32_dfsdm_filter_set_trig(struct iio_dev *indio_dev,
> unsigned int fl_id,
> struct iio_trigger *trig)
> {
> - struct iio_dev *indio_dev = iio_priv_to_dev(adc);
> + struct stm32_dfsdm_adc *adc = iio_priv(indio_dev);
> struct regmap *regmap = adc->dfsdm->regmap;
> u32 jextsel = 0, jexten = STM32_DFSDM_JEXTEN_DISABLED;
> int ret;
> @@ -447,11 +447,11 @@ static int stm32_dfsdm_filter_set_trig(struct stm32_dfsdm_adc *adc,
> return 0;
> }
>
> -static int stm32_dfsdm_channels_configure(struct stm32_dfsdm_adc *adc,
> +static int stm32_dfsdm_channels_configure(struct iio_dev *indio_dev,
> unsigned int fl_id,
> struct iio_trigger *trig)
> {
> - struct iio_dev *indio_dev = iio_priv_to_dev(adc);
> + struct stm32_dfsdm_adc *adc = iio_priv(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];
> @@ -491,11 +491,11 @@ static int stm32_dfsdm_channels_configure(struct stm32_dfsdm_adc *adc,
> return 0;
> }
>
> -static int stm32_dfsdm_filter_configure(struct stm32_dfsdm_adc *adc,
> +static int stm32_dfsdm_filter_configure(struct iio_dev *indio_dev,
> unsigned int fl_id,
> struct iio_trigger *trig)
> {
> - struct iio_dev *indio_dev = iio_priv_to_dev(adc);
> + struct stm32_dfsdm_adc *adc = iio_priv(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];
> @@ -521,7 +521,7 @@ static int stm32_dfsdm_filter_configure(struct stm32_dfsdm_adc *adc,
> if (ret)
> return ret;
>
> - ret = stm32_dfsdm_filter_set_trig(adc, fl_id, trig);
> + ret = stm32_dfsdm_filter_set_trig(indio_dev, fl_id, trig);
> if (ret)
> return ret;
>
> @@ -729,21 +729,22 @@ static ssize_t dfsdm_adc_audio_set_spiclk(struct iio_dev *indio_dev,
> return len;
> }
>
> -static int stm32_dfsdm_start_conv(struct stm32_dfsdm_adc *adc,
> +static int stm32_dfsdm_start_conv(struct iio_dev *indio_dev,
> struct iio_trigger *trig)
> {
> + struct stm32_dfsdm_adc *adc = iio_priv(indio_dev);
> struct regmap *regmap = adc->dfsdm->regmap;
> int ret;
>
> - ret = stm32_dfsdm_channels_configure(adc, adc->fl_id, trig);
> + ret = stm32_dfsdm_channels_configure(indio_dev, adc->fl_id, trig);
> if (ret < 0)
> return ret;
>
> - ret = stm32_dfsdm_start_channel(adc);
> + ret = stm32_dfsdm_start_channel(indio_dev);
> if (ret < 0)
> return ret;
>
> - ret = stm32_dfsdm_filter_configure(adc, adc->fl_id, trig);
> + ret = stm32_dfsdm_filter_configure(indio_dev, adc->fl_id, trig);
> if (ret < 0)
> goto stop_channels;
>
> @@ -757,13 +758,14 @@ static int stm32_dfsdm_start_conv(struct stm32_dfsdm_adc *adc,
> regmap_update_bits(regmap, DFSDM_CR1(adc->fl_id),
> DFSDM_CR1_CFG_MASK, 0);
> stop_channels:
> - stm32_dfsdm_stop_channel(adc);
> + stm32_dfsdm_stop_channel(indio_dev);
>
> return ret;
> }
>
> -static void stm32_dfsdm_stop_conv(struct stm32_dfsdm_adc *adc)
> +static void stm32_dfsdm_stop_conv(struct iio_dev *indio_dev)
> {
> + struct stm32_dfsdm_adc *adc = iio_priv(indio_dev);
> struct regmap *regmap = adc->dfsdm->regmap;
>
> stm32_dfsdm_stop_filter(adc->dfsdm, adc->fl_id);
> @@ -771,7 +773,7 @@ static void stm32_dfsdm_stop_conv(struct stm32_dfsdm_adc *adc)
> regmap_update_bits(regmap, DFSDM_CR1(adc->fl_id),
> DFSDM_CR1_CFG_MASK, 0);
>
> - stm32_dfsdm_stop_channel(adc);
> + stm32_dfsdm_stop_channel(indio_dev);
> }
>
> static int stm32_dfsdm_set_watermark(struct iio_dev *indio_dev,
> @@ -1017,7 +1019,7 @@ static int __stm32_dfsdm_postenable(struct iio_dev *indio_dev)
> goto stop_dfsdm;
> }
>
> - ret = stm32_dfsdm_start_conv(adc, indio_dev->trig);
> + ret = stm32_dfsdm_start_conv(indio_dev, indio_dev->trig);
> if (ret) {
> dev_err(&indio_dev->dev, "Can't start conversion\n");
> goto err_stop_dma;
> @@ -1063,7 +1065,7 @@ static void __stm32_dfsdm_predisable(struct iio_dev *indio_dev)
> {
> struct stm32_dfsdm_adc *adc = iio_priv(indio_dev);
>
> - stm32_dfsdm_stop_conv(adc);
> + stm32_dfsdm_stop_conv(indio_dev);
>
> stm32_dfsdm_adc_dma_stop(indio_dev);
>
> @@ -1159,7 +1161,7 @@ static int stm32_dfsdm_single_conv(struct iio_dev *indio_dev,
>
> adc->nconv = 1;
> adc->smask = BIT(chan->scan_index);
> - ret = stm32_dfsdm_start_conv(adc, NULL);
> + ret = stm32_dfsdm_start_conv(indio_dev, NULL);
> if (ret < 0) {
> regmap_update_bits(adc->dfsdm->regmap, DFSDM_CR2(adc->fl_id),
> DFSDM_CR2_REOCIE_MASK, DFSDM_CR2_REOCIE(0));
> @@ -1180,7 +1182,7 @@ static int stm32_dfsdm_single_conv(struct iio_dev *indio_dev,
> else
> ret = IIO_VAL_INT;
>
> - stm32_dfsdm_stop_conv(adc);
> + stm32_dfsdm_stop_conv(indio_dev);
>
> stm32_dfsdm_process_data(adc, res);
>
> @@ -1313,8 +1315,8 @@ 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 = arg;
> + struct stm32_dfsdm_adc *adc = iio_priv(indio_dev);
> struct regmap *regmap = adc->dfsdm->regmap;
> unsigned int status, int_en;
>
> @@ -1574,7 +1576,7 @@ static int stm32_dfsdm_adc_probe(struct platform_device *pdev)
> iio->dev.of_node = np;
> iio->modes = INDIO_DIRECT_MODE;
>
> - platform_set_drvdata(pdev, adc);
> + platform_set_drvdata(pdev, iio);
>
> ret = of_property_read_u32(dev->of_node, "reg", &adc->fl_id);
> if (ret != 0 || adc->fl_id >= adc->dfsdm->num_fls) {
> @@ -1603,7 +1605,7 @@ static int stm32_dfsdm_adc_probe(struct platform_device *pdev)
> return irq;
>
> ret = devm_request_irq(dev, irq, stm32_dfsdm_irq,
> - 0, pdev->name, adc);
> + 0, pdev->name, iio);
> if (ret < 0) {
> dev_err(dev, "Failed to request IRQ\n");
> return ret;
> @@ -1650,8 +1652,8 @@ 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 = platform_get_drvdata(pdev);
> + struct stm32_dfsdm_adc *adc = iio_priv(indio_dev);
>
> if (adc->dev_data->type == DFSDM_AUDIO)
> of_platform_depopulate(&pdev->dev);
> @@ -1663,8 +1665,7 @@ 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 = dev_get_drvdata(dev);
>
> if (iio_buffer_enabled(indio_dev))
> __stm32_dfsdm_predisable(indio_dev);
> @@ -1674,8 +1675,8 @@ 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 = dev_get_drvdata(dev);
> + struct stm32_dfsdm_adc *adc = iio_priv(indio_dev);
> const struct iio_chan_spec *chan;
> struct stm32_dfsdm_channel *ch;
> int i, ret;

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