From: Miquel Raynal <miquel.raynal@bootlin.com>
To: Jonathan Cameron <jic23@kernel.org>,
Lars-Peter Clausen <lars@metafoo.de>,
linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
Nuno Sa <Nuno.Sa@analog.com>,
Miquel Raynal <miquel.raynal@bootlin.com>
Subject: [PATCH v2 13/16] iio: adc: max1027: Introduce an end of conversion helper
Date: Thu, 2 Sep 2021 23:14:34 +0200 [thread overview]
Message-ID: <20210902211437.503623-14-miquel.raynal@bootlin.com> (raw)
In-Reply-To: <20210902211437.503623-1-miquel.raynal@bootlin.com>
For now this helper only waits for the maximum duration of a single
conversion (even though a temperature measurement will take twice this
time, we only care about the temperature which happens first, so we will
still only wait for a single sample).
This helper will soon be improved to properly handle the end of
conversion interrupt as well as a higher number of samples.
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
---
drivers/iio/adc/max1027.c | 18 ++++++++++++++++--
1 file changed, 16 insertions(+), 2 deletions(-)
diff --git a/drivers/iio/adc/max1027.c b/drivers/iio/adc/max1027.c
index 5456432b9404..b85fe0a48ff9 100644
--- a/drivers/iio/adc/max1027.c
+++ b/drivers/iio/adc/max1027.c
@@ -60,6 +60,9 @@
#define MAX1027_NAVG_32 (0x03 << 2)
#define MAX1027_AVG_EN BIT(4)
+/* Device can achieve 300ksps so we assume a 3.33us conversion delay */
+#define MAX1027_CONVERSION_UDELAY 4
+
enum max1027_id {
max1027,
max1029,
@@ -257,6 +260,15 @@ struct max1027_state {
u8 reg ____cacheline_aligned;
};
+static int max1027_wait_eoc(struct iio_dev *indio_dev)
+{
+ unsigned int conversion_time = MAX1027_CONVERSION_UDELAY;
+
+ usleep_range(conversion_time, conversion_time * 2);
+
+ return 0;
+}
+
/* Scan from chan 0 to the highest requested channel. Include temperature on demand. */
static int max1027_configure_chans_and_start(struct iio_dev *indio_dev)
{
@@ -315,9 +327,11 @@ static int max1027_read_single_value(struct iio_dev *indio_dev,
/*
* For an unknown reason, when we use the mode "10" (write
* conversion register), the interrupt doesn't occur every time.
- * So we just wait 1 ms.
+ * So we just wait the maximum conversion time and deliver the value.
*/
- mdelay(1);
+ ret = max1027_wait_eoc(indio_dev);
+ if (ret)
+ return ret;
/* Read result */
ret = spi_read(st->spi, st->buffer, (chan->type == IIO_TEMP) ? 4 : 2);
--
2.27.0
next prev parent reply other threads:[~2021-09-02 21:15 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-02 21:14 [PATCH v2 00/16] Bring external triggers support to MAX1027-like ADCs Miquel Raynal
2021-09-02 21:14 ` [PATCH v2 01/16] iio: adc: max1027: Fix style Miquel Raynal
2021-09-02 21:14 ` [PATCH v2 02/16] iio: adc: max1027: Drop extra warning message Miquel Raynal
2021-09-02 21:14 ` [PATCH v2 03/16] iio: adc: max1027: Drop useless debug messages Miquel Raynal
2021-09-02 21:14 ` [PATCH v2 04/16] iio: adc: max1027: Avoid device managed allocators for DMA purposes Miquel Raynal
2021-09-05 15:26 ` Jonathan Cameron
2021-09-02 21:14 ` [PATCH v2 05/16] iio: adc: max1027: Minimize the number of converted channels Miquel Raynal
2021-09-05 15:34 ` Jonathan Cameron
2021-09-15 9:46 ` Miquel Raynal
2021-09-02 21:14 ` [PATCH v2 06/16] iio: adc: max1027: Rename a helper Miquel Raynal
2021-09-02 21:14 ` [PATCH v2 07/16] iio: adc: max1027: Create a helper to enable/disable the cnvst trigger Miquel Raynal
2021-09-02 21:14 ` [PATCH v2 08/16] iio: adc: max1027: Simplify the _set_trigger_state() helper Miquel Raynal
2021-09-02 21:14 ` [PATCH v2 09/16] iio: adc: max1027: Ensure a default cnvst trigger configuration Miquel Raynal
2021-09-02 21:14 ` [PATCH v2 10/16] iio: adc: max1027: Create a helper to configure the channels to scan Miquel Raynal
2021-09-02 21:14 ` [PATCH v2 11/16] iio: adc: max1027: Prevent single channel accesses during buffer reads Miquel Raynal
2021-09-05 15:38 ` Jonathan Cameron
2021-09-02 21:14 ` [PATCH v2 12/16] iio: adc: max1027: Separate the IRQ handler from the read logic Miquel Raynal
2021-09-02 21:14 ` Miquel Raynal [this message]
2021-09-02 21:14 ` [PATCH v2 14/16] iio: adc: max1027: Don't just sleep when the EOC interrupt is available Miquel Raynal
2021-09-06 9:38 ` Sa, Nuno
2021-09-15 9:55 ` Miquel Raynal
2021-09-02 21:14 ` [PATCH v2 15/16] iio: adc: max1027: Add support for external triggers Miquel Raynal
2021-09-05 16:10 ` Jonathan Cameron
2021-09-06 9:53 ` Sa, Nuno
2021-09-15 15:45 ` Miquel Raynal
2021-09-18 17:39 ` Jonathan Cameron
2021-09-20 10:47 ` Miquel Raynal
2021-09-15 10:18 ` Miquel Raynal
2021-09-18 17:13 ` Jonathan Cameron
2021-09-20 8:37 ` Miquel Raynal
2021-09-20 17:43 ` Jonathan Cameron
2021-09-21 8:11 ` Miquel Raynal
2021-09-02 21:14 ` [PATCH v2 16/16] iio: adc: max1027: Don't reject external triggers when there is no IRQ Miquel Raynal
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