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iio: adc: stm32-adc: add debugfs to read raw calibration result

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Add debugfs to read linear ADC STM32 self calibration results.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Signed-off-by: Olivier Moysan <olivier.moysan@foss.st.com>
Reviewed-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Link: https://lore.kernel.org/r/20221115103124.70074-4-olivier.moysan@foss.st.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Olivier Moysan 2022-11-15 11:31:23 +01:00 committed by Jonathan Cameron
parent 2206732b9a
commit 51bcacc6fc
1 changed files with 22 additions and 0 deletions
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22
drivers/iio/adc/stm32-adc.c
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@ -7,6 +7,7 @@
*/
#include <linux/clk.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
@ -1879,6 +1880,23 @@ static const struct iio_chan_spec_ext_info stm32_adc_ext_info[] = {
{},
};
static void stm32_adc_debugfs_init(struct iio_dev *indio_dev)
{
struct stm32_adc *adc = iio_priv(indio_dev);
struct dentry *d = iio_get_debugfs_dentry(indio_dev);
struct stm32_adc_calib *cal = &adc->cal;
char buf[16];
unsigned int i;
if (!adc->cfg->has_linearcal)
return;
for (i = 0; i < STM32H7_LINCALFACT_NUM; i++) {
snprintf(buf, sizeof(buf), "lincalfact%d", i + 1);
debugfs_create_u32(buf, 0444, d, &cal->lincalfact[i]);
}
}
static int stm32_adc_fw_get_resolution(struct iio_dev *indio_dev)
{
struct device *dev = &indio_dev->dev;
@ -2465,6 +2483,9 @@ static int stm32_adc_probe(struct platform_device *pdev)
pm_runtime_mark_last_busy(dev);
pm_runtime_put_autosuspend(dev);
if (IS_ENABLED(CONFIG_DEBUG_FS))
stm32_adc_debugfs_init(indio_dev);
return 0;
err_hw_stop:
@ -2493,6 +2514,7 @@ static int stm32_adc_remove(struct platform_device *pdev)
struct stm32_adc *adc = iio_priv(indio_dev);
pm_runtime_get_sync(&pdev->dev);
/* iio_device_unregister() also removes debugfs entries */
iio_device_unregister(indio_dev);
stm32_adc_hw_stop(&pdev->dev);
pm_runtime_disable(&pdev->dev);