iio: ti_am335x_adc: check if we found the value (1460c152) · Commits · 戴 / test

Usually we get all the values we wanted but it is possible, that te ADC unit is busy performing the conversation for the HW events. In that case -EBUSY is returned and the user may re-call the function. Acked-by:

Jonathan Cameron <jic23@kernel.org> Signed-off-by:

Sebastian Andrzej Siewior <bigeasy@linutronix.de>

drivers/iio/adc/ti_am335x_adc.c

+6 −2

Original line number	Diff line number	Diff line
		@@ -145,6 +145,7 @@ static int tiadc_read_raw(struct iio_dev *indio_dev,
		int i;
		unsigned int fifo1count, read;
		u32 step = UINT_MAX;
		bool found = false;

		/*
		* When the sub-system is first enabled,
		@@ -169,11 +170,14 @@ static int tiadc_read_raw(struct iio_dev *indio_dev,
		fifo1count = tiadc_readl(adc_dev, REG_FIFO1CNT);
		for (i = 0; i < fifo1count; i++) {
		read = tiadc_readl(adc_dev, REG_FIFO1);
		if (read >> 16 == step)
		if (read >> 16 == step) {
		*val = read & 0xfff;
		found = true;
		}
		}
		am335x_tsc_se_update(adc_dev->mfd_tscadc);

		if (found == false)
		return -EBUSY;
		return IIO_VAL_INT;
		}

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