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authorAhmad Fatoum <a.fatoum@pengutronix.de>2021-01-25 20:48:23 +0100
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2021-03-11 20:46:57 +0000
commit8a09054f3e8afd0521309b15baab716fa7454785 (patch)
tree5c48052247aaa80f7ff4d90bd0d036d133cfcef5
parent6c3b615379d7cd90d2f70b3cf9860c5a4910546a (diff)
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iio: adc: stm32-adc: enable timestamping for non-DMA usage
For non-DMA usage, we have an easy way to associate a timestamp with a sample: iio_pollfunc_store_time stores a timestamp in the primary trigger IRQ handler and stm32_adc_trigger_handler runs in the IRQ thread to push out the buffer along with the timestamp. For this to work, the driver needs to register an IIO_TIMESTAMP channel. Do this. For DMA, it's not as easy, because we don't push the buffers out of stm32_adc_trigger, but out of stm32_adc_dma_buffer_done, which runs in a tasklet scheduled after a DMA completion. Preferably, the DMA controller would copy us the timestamp into that buffer as well. Until this is implemented, restrict timestamping support to only PIO. For low-frequency sampling, PIO is probably good enough. Cc: Holger Assmann <has@pengutronix.de> Acked-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com> Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de> Link: https://lore.kernel.org/r/20210125194824.30549-1-a.fatoum@pengutronix.de Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
-rw-r--r--drivers/iio/adc/stm32-adc.c39
1 files changed, 31 insertions, 8 deletions
diff --git a/drivers/iio/adc/stm32-adc.c b/drivers/iio/adc/stm32-adc.c
index f7c53cea509a..b25386b19373 100644
--- a/drivers/iio/adc/stm32-adc.c
+++ b/drivers/iio/adc/stm32-adc.c
@@ -177,7 +177,7 @@ struct stm32_adc_cfg {
* @offset: ADC instance register offset in ADC block
* @cfg: compatible configuration data
* @completion: end of single conversion completion
- * @buffer: data buffer
+ * @buffer: data buffer + 8 bytes for timestamp if enabled
* @clk: clock for this adc instance
* @irq: interrupt for this adc instance
* @lock: spinlock
@@ -200,7 +200,7 @@ struct stm32_adc {
u32 offset;
const struct stm32_adc_cfg *cfg;
struct completion completion;
- u16 buffer[STM32_ADC_MAX_SQ];
+ u16 buffer[STM32_ADC_MAX_SQ + 4] __aligned(8);
struct clk *clk;
int irq;
spinlock_t lock; /* interrupt lock */
@@ -1714,7 +1714,7 @@ static void stm32_adc_chan_init_one(struct iio_dev *indio_dev,
}
}
-static int stm32_adc_chan_of_init(struct iio_dev *indio_dev)
+static int stm32_adc_chan_of_init(struct iio_dev *indio_dev, bool timestamping)
{
struct device_node *node = indio_dev->dev.of_node;
struct stm32_adc *adc = iio_priv(indio_dev);
@@ -1762,6 +1762,9 @@ static int stm32_adc_chan_of_init(struct iio_dev *indio_dev)
return -EINVAL;
}
+ if (timestamping)
+ num_channels++;
+
channels = devm_kcalloc(&indio_dev->dev, num_channels,
sizeof(struct iio_chan_spec), GFP_KERNEL);
if (!channels)
@@ -1812,6 +1815,19 @@ static int stm32_adc_chan_of_init(struct iio_dev *indio_dev)
stm32_adc_smpr_init(adc, channels[i].channel, smp);
}
+ if (timestamping) {
+ struct iio_chan_spec *timestamp = &channels[scan_index];
+
+ timestamp->type = IIO_TIMESTAMP;
+ timestamp->channel = -1;
+ timestamp->scan_index = scan_index;
+ timestamp->scan_type.sign = 's';
+ timestamp->scan_type.realbits = 64;
+ timestamp->scan_type.storagebits = 64;
+
+ scan_index++;
+ }
+
indio_dev->num_channels = scan_index;
indio_dev->channels = channels;
@@ -1871,6 +1887,7 @@ static int stm32_adc_probe(struct platform_device *pdev)
struct device *dev = &pdev->dev;
irqreturn_t (*handler)(int irq, void *p) = NULL;
struct stm32_adc *adc;
+ bool timestamping = false;
int ret;
if (!pdev->dev.of_node)
@@ -1927,16 +1944,22 @@ static int stm32_adc_probe(struct platform_device *pdev)
if (ret < 0)
return ret;
- ret = stm32_adc_chan_of_init(indio_dev);
- if (ret < 0)
- return ret;
-
ret = stm32_adc_dma_request(dev, indio_dev);
if (ret < 0)
return ret;
- if (!adc->dma_chan)
+ if (!adc->dma_chan) {
+ /* For PIO mode only, iio_pollfunc_store_time stores a timestamp
+ * in the primary trigger IRQ handler and stm32_adc_trigger_handler
+ * runs in the IRQ thread to push out buffer along with timestamp.
+ */
handler = &stm32_adc_trigger_handler;
+ timestamping = true;
+ }
+
+ ret = stm32_adc_chan_of_init(indio_dev, timestamping);
+ if (ret < 0)
+ goto err_dma_disable;
ret = iio_triggered_buffer_setup(indio_dev,
&iio_pollfunc_store_time, handler,