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List: linux-iio
Subject: [PATCH 08/10 v4] iio: pressure: bmp280: add support for BMP085 EOC interrupt
From: Linus Walleij <linus.walleij () linaro ! org>
Date: 2016-06-30 1:48:52
Message-ID: 1467251334-30594-9-git-send-email-linus.walleij () linaro ! org
[Download RAW message or body]
The first version of this sensor, BMP085, supports sending an
End-of-Conversion (EOC) interrupt. Add code to support this using
a completion, in a similar vein as drivers/misc/bmp085.c does.
Make sure to check that we are given a rising edge, because the
EOC line goes from low-to-high when the conversion is ready.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
ChangeLog v3->v4:
- Fix a few 058/085 typos
ChangeLog v2->v3:
- Fetch interrupt before registering IIO device
- Factor out a separate BMP058 IRQ fetch function
ChangeLog v1->v2:
- Fix spelling mistakes
- Rebase on all other stuff like changes in probe() etc
---
drivers/iio/pressure/bmp280-core.c | 92 ++++++++++++++++++++++++++++++++++----
drivers/iio/pressure/bmp280-i2c.c | 3 +-
drivers/iio/pressure/bmp280-spi.c | 3 +-
drivers/iio/pressure/bmp280.h | 3 +-
4 files changed, 89 insertions(+), 12 deletions(-)
diff --git a/drivers/iio/pressure/bmp280-core.c b/drivers/iio/pressure/bmp280-core.c
index 89ed608035f8..b2858fbc1049 100644
--- a/drivers/iio/pressure/bmp280-core.c
+++ b/drivers/iio/pressure/bmp280-core.c
@@ -27,6 +27,9 @@
#include <linux/iio/sysfs.h>
#include <linux/gpio/consumer.h>
#include <linux/regulator/consumer.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h> /* For irq_get_irq_data() */
+#include <linux/completion.h>
#include "bmp280.h"
@@ -34,6 +37,8 @@ struct bmp280_data {
struct device *dev;
struct mutex lock;
struct regmap *regmap;
+ struct completion done;
+ bool use_eoc;
const struct bmp280_chip_info *chip_info;
struct regulator *vddd;
struct regulator *vdda;
@@ -595,16 +600,32 @@ static int bmp180_measure(struct bmp280_data *data, u8 ctrl_meas)
unsigned int delay_us;
unsigned int ctrl;
+ if (data->use_eoc)
+ init_completion(&data->done);
+
ret = regmap_write(data->regmap, BMP280_REG_CTRL_MEAS, ctrl_meas);
if (ret)
return ret;
- if (ctrl_meas == BMP180_MEAS_TEMP)
- delay_us = 4500;
- else
- delay_us = conversion_time_max[data->oversampling_press];
-
- usleep_range(delay_us, delay_us + 1000);
+ if (data->use_eoc) {
+ /*
+ * If we have a completion interrupt, use it, wait up to
+ * 100ms. The longest conversion time listed is 76.5 ms for
+ * advanced resolution mode.
+ */
+ ret = wait_for_completion_timeout(&data->done,
+ 1 + msecs_to_jiffies(100));
+ if (!ret)
+ dev_err(data->dev, "timeout waiting for completion\n");
+ } else {
+ if (ctrl_meas == BMP180_MEAS_TEMP)
+ delay_us = 4500;
+ else
+ delay_us =
+ conversion_time_max[data->oversampling_press];
+
+ usleep_range(delay_us, delay_us + 1000);
+ }
ret = regmap_read(data->regmap, BMP280_REG_CTRL_MEAS, &ctrl);
if (ret)
@@ -846,10 +867,51 @@ static const struct bmp280_chip_info bmp180_chip_info = {
.read_press = bmp180_read_press,
};
+static irqreturn_t bmp085_eoc_irq(int irq, void *d)
+{
+ struct bmp280_data *data = d;
+
+ complete(&data->done);
+
+ return IRQ_HANDLED;
+}
+
+int bmp085_fetch_eoc_irq(struct device *dev,
+ const char *name,
+ int irq,
+ struct bmp280_data *data)
+{
+ unsigned long irq_trig;
+ int ret;
+
+ irq_trig = irqd_get_trigger_type(irq_get_irq_data(irq));
+ if (irq_trig != IRQF_TRIGGER_RISING) {
+ dev_err(dev, "non-rising trigger given for EOC interrupt, "
+ "trying to enforce it\n");
+ irq_trig = IRQF_TRIGGER_RISING;
+ }
+ ret = devm_request_threaded_irq(dev,
+ irq,
+ bmp085_eoc_irq,
+ NULL,
+ irq_trig,
+ name,
+ data);
+ if (ret) {
+ /* Bail out without IRQ but keep the driver in place */
+ dev_err(dev, "unable to request DRDY IRQ\n");
+ return 0;
+ }
+
+ data->use_eoc = true;
+ return 0;
+}
+
int bmp280_common_probe(struct device *dev,
struct regmap *regmap,
unsigned int chip,
- const char *name)
+ const char *name,
+ int irq)
{
int ret;
struct iio_dev *indio_dev;
@@ -948,10 +1010,22 @@ int bmp280_common_probe(struct device *dev,
dev_set_drvdata(dev, data);
+ /*
+ * Attempt to grab an optional EOC IRQ - only the BMP085 has this
+ * however as it happens, the BMP085 shares the chip ID of BMP180
+ * so we look for an IRQ if we have that.
+ */
+ if (irq > 0 || (chip_id == BMP180_CHIP_ID)) {
+ ret = bmp085_fetch_eoc_irq(dev, name, irq, data);
+ if (ret)
+ goto out_disable_vdda;
+ }
+
ret = devm_iio_device_register(dev, indio_dev);
- if (ret)
+ if (ret) {
+ dev_err(dev, "unable to register IIO device\n");
goto out_disable_vdda;
-
+ }
return 0;
out_disable_vdda:
diff --git a/drivers/iio/pressure/bmp280-i2c.c b/drivers/iio/pressure/bmp280-i2c.c
index 7c70ee172bba..8cf8a900bdaa 100644
--- a/drivers/iio/pressure/bmp280-i2c.c
+++ b/drivers/iio/pressure/bmp280-i2c.c
@@ -33,7 +33,8 @@ static int bmp280_i2c_probe(struct i2c_client *client,
return bmp280_common_probe(&client->dev,
regmap,
id->driver_data,
- id->name);
+ id->name,
+ client->irq);
}
static int bmp280_i2c_remove(struct i2c_client *client)
diff --git a/drivers/iio/pressure/bmp280-spi.c b/drivers/iio/pressure/bmp280-spi.c
index 216e64b682bf..cd365ba74b68 100644
--- a/drivers/iio/pressure/bmp280-spi.c
+++ b/drivers/iio/pressure/bmp280-spi.c
@@ -81,7 +81,8 @@ static int bmp280_spi_probe(struct spi_device *spi)
return bmp280_common_probe(&spi->dev,
regmap,
id->driver_data,
- id->name);
+ id->name,
+ spi->irq);
}
static int bmp280_spi_remove(struct spi_device *spi)
diff --git a/drivers/iio/pressure/bmp280.h b/drivers/iio/pressure/bmp280.h
index b9fc28ce9428..573334b8e93b 100644
--- a/drivers/iio/pressure/bmp280.h
+++ b/drivers/iio/pressure/bmp280.h
@@ -104,5 +104,6 @@ extern const struct regmap_config bmp280_regmap_config;
int bmp280_common_probe(struct device *dev,
struct regmap *regmap,
unsigned int chip,
- const char *name);
+ const char *name,
+ int irq);
int bmp280_common_remove(struct device *dev);
--
2.4.11
--
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