From: Marcus Folkesson <marcus.folkesson@gmail.com>
To: Marcus Folkesson <marcus.folkesson@gmail.com>,
Kent Gustavsson <kent@minoris.se>,
Jonathan Cameron <jic23@kernel.org>,
Lars-Peter Clausen <lars@metafoo.de>,
Rob Herring <robh+dt@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: linux-iio@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v4 6/9] iio: adc: mcp3911: add support for interrupts
Date: Fri, 22 Jul 2022 15:07:23 +0200 [thread overview]
Message-ID: <20220722130726.7627-7-marcus.folkesson@gmail.com> (raw)
In-Reply-To: <20220722130726.7627-1-marcus.folkesson@gmail.com>
Make it possible to read values upon interrupts.
Configure Data Ready Signal Output Pin to either HiZ or push-pull and
use it as interrupt source.
Signed-off-by: Marcus Folkesson <marcus.folkesson@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
---
drivers/iio/adc/mcp3911.c | 53 +++++++++++++++++++++++++++++++++++++++
1 file changed, 53 insertions(+)
diff --git a/drivers/iio/adc/mcp3911.c b/drivers/iio/adc/mcp3911.c
index 96c0a2a50c7c..7db2c75da4ac 100644
--- a/drivers/iio/adc/mcp3911.c
+++ b/drivers/iio/adc/mcp3911.c
@@ -29,6 +29,7 @@
#define MCP3911_REG_GAIN 0x09
#define MCP3911_REG_STATUSCOM 0x0a
+#define MCP3911_STATUSCOM_DRHIZ BIT(12)
#define MCP3911_STATUSCOM_READ GENMASK(7, 6)
#define MCP3911_STATUSCOM_CH1_24WIDTH BIT(4)
#define MCP3911_STATUSCOM_CH0_24WIDTH BIT(3)
@@ -62,6 +63,7 @@ struct mcp3911 {
struct regulator *vref;
struct clk *clki;
u32 dev_addr;
+ struct iio_trigger *trig;
struct {
u32 channels[MCP3911_NUM_CHANNELS];
s64 ts __aligned(8);
@@ -346,6 +348,23 @@ static void mcp3911_cleanup_regulator(void *_adc)
regulator_disable(adc->vref);
}
+static int mcp3911_set_trigger_state(struct iio_trigger *trig, bool enable)
+{
+ struct mcp3911 *adc = iio_trigger_get_drvdata(trig);
+
+ if (enable)
+ enable_irq(adc->spi->irq);
+ else
+ disable_irq(adc->spi->irq);
+
+ return 0;
+}
+
+static const struct iio_trigger_ops mcp3911_trigger_ops = {
+ .validate_device = iio_trigger_validate_own_device,
+ .set_trigger_state = mcp3911_set_trigger_state,
+};
+
static int mcp3911_probe(struct spi_device *spi)
{
struct iio_dev *indio_dev;
@@ -409,6 +428,15 @@ static int mcp3911_probe(struct spi_device *spi)
if (ret)
return ret;
+ if (device_property_read_bool(&adc->spi->dev, "microchip,data-ready-hiz"))
+ ret = mcp3911_update(adc, MCP3911_REG_STATUSCOM, MCP3911_STATUSCOM_DRHIZ,
+ 0, 2);
+ else
+ ret = mcp3911_update(adc, MCP3911_REG_STATUSCOM, MCP3911_STATUSCOM_DRHIZ,
+ MCP3911_STATUSCOM_DRHIZ, 2);
+ if (ret)
+ return ret;
+
indio_dev->name = spi_get_device_id(spi)->name;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->info = &mcp3911_info;
@@ -419,6 +447,31 @@ static int mcp3911_probe(struct spi_device *spi)
mutex_init(&adc->lock);
+ if (spi->irq > 0) {
+ adc->trig = devm_iio_trigger_alloc(&spi->dev, "%s-dev%d",
+ indio_dev->name,
+ iio_device_id(indio_dev));
+ if (!adc->trig)
+ return PTR_ERR(adc->trig);
+
+ adc->trig->ops = &mcp3911_trigger_ops;
+ iio_trigger_set_drvdata(adc->trig, adc);
+ ret = devm_iio_trigger_register(&spi->dev, adc->trig);
+ if (ret)
+ return ret;
+
+ /*
+ * The device generates interrupts as long as it is powered up.
+ * Some platforms might not allow the option to power it down so
+ * don't enable the interrupt to avoid extra load on the system.
+ */
+ ret = devm_request_irq(&spi->dev, spi->irq,
+ &iio_trigger_generic_data_rdy_poll, IRQF_NO_AUTOEN | IRQF_ONESHOT,
+ indio_dev->name, adc->trig);
+ if (ret)
+ return ret;
+ }
+
ret = devm_iio_triggered_buffer_setup(&spi->dev, indio_dev,
NULL,
mcp3911_trigger_handler, NULL);
--
2.36.1
next prev parent reply other threads:[~2022-07-22 13:04 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-22 13:07 [PATCH v4 0/9] Improve MCP3911 driver Marcus Folkesson
2022-07-22 13:07 ` [PATCH v4 1/9] iio: adc: mcp3911: make use of the sign bit Marcus Folkesson
2022-07-22 13:07 ` [PATCH v4 2/9] iio: adc: mcp3911: correct "microchip,device-addr" property Marcus Folkesson
2022-07-22 13:07 ` [PATCH v4 3/9] iio: adc: mcp3911: use correct formula for AD conversion Marcus Folkesson
2022-08-07 14:24 ` Jonathan Cameron
2022-07-22 13:07 ` [PATCH v4 4/9] iio: adc: mcp3911: use resource-managed version of iio_device_register Marcus Folkesson
2022-07-31 16:38 ` Jonathan Cameron
2022-07-31 16:39 ` Jonathan Cameron
2022-07-22 13:07 ` [PATCH v4 5/9] iio: adc: mcp3911: add support for buffers Marcus Folkesson
2022-07-31 16:51 ` Jonathan Cameron
2022-08-01 7:17 ` Marcus Folkesson
2022-07-22 13:07 ` Marcus Folkesson [this message]
2022-07-31 16:52 ` [PATCH v4 6/9] iio: adc: mcp3911: add support for interrupts Jonathan Cameron
2022-07-22 13:07 ` [PATCH v4 7/9] dt-bindings: iio: adc: mcp3911: add microchip,data-ready-hiz entry Marcus Folkesson
2022-07-22 13:07 ` [PATCH v4 8/9] iio: adc: mcp3911: add support for oversampling ratio Marcus Folkesson
2022-07-22 13:07 ` [PATCH v4 9/9] iio: adc: mcp3911: add support to set PGA Marcus Folkesson
2022-07-31 16:53 ` Jonathan Cameron
2022-07-31 16:41 ` [PATCH v4 0/9] Improve MCP3911 driver Jonathan Cameron
2022-08-01 7:45 ` Marcus Folkesson
2022-08-06 14:08 ` Jonathan Cameron
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