The first version of this sensor, BMP058, supports sending an
End-of-Conversion (EOC) interrupt. Add code to support this using
a completion, in a similar vein as drivers/misc/bmp058.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@xxxxxxxxxx>
---
drivers/iio/pressure/bmp280-core.c | 83 ++++++++++++++++++++++++++++++++++----
drivers/iio/pressure/bmp280-i2c.c | 3 +-
drivers/iio/pressure/bmp280-spi.c | 3 +-
drivers/iio/pressure/bmp280.h | 3 +-
4 files changed, 81 insertions(+), 11 deletions(-)
diff --git a/drivers/iio/pressure/bmp280-core.c b/drivers/iio/pressure/bmp280-core.c
index af422d224db4..ca9ed843efcc 100644
--- a/drivers/iio/pressure/bmp280-core.c
+++ b/drivers/iio/pressure/bmp280-core.c
@@ -25,6 +25,9 @@
#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"
@@ -32,6 +35,8 @@ 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;
@@ -435,16 +440,32 @@ 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)
@@ -686,16 +707,28 @@ static const struct bmp280_chip_info bmp180_chip_info = {
.read_press = bmp180_read_press,
};
+static irqreturn_t bmp058_eoc_irq(int irq, void *d)
+{
+ struct bmp280_data *data = d;
+
+ complete(&data->done);
+
+ return IRQ_HANDLED;
+}
+
+
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;
struct bmp280_data *data;
unsigned int chip_id;
struct gpio_desc *gpiod;
+ unsigned long irq_trig;
indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
if (!indio_dev)
@@ -763,5 +796,39 @@ int bmp280_common_probe(struct device *dev,
if (ret < 0)
return ret;
- return devm_iio_device_register(dev, indio_dev);
+ ret = devm_iio_device_register(dev, indio_dev);
+ if (ret) {
+ dev_err(dev, "unable to register IIO device\n");
+ return ret;
+ }
+
+ /*
+ * Attempt to grab an optional EOC IRQ - only the BMP058 has this
+ * however as it happens, the BMP058 shares the chip ID of BMP180
+ * so we look for an IRQ if we have that.
+ */
+ if (irq <= 0 || (chip_id != BMP180_CHIP_ID))
+ return 0;
+
+ 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,
+ bmp058_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;
}
diff --git a/drivers/iio/pressure/bmp280-i2c.c b/drivers/iio/pressure/bmp280-i2c.c
index b422600f34e0..eb2b727109b8 100644
--- a/drivers/iio/pressure/bmp280-i2c.c
+++ b/drivers/iio/pressure/bmp280-i2c.c
@@ -32,7 +32,8 @@ 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 const struct acpi_device_id bmp280_acpi_i2c_match[] = {
diff --git a/drivers/iio/pressure/bmp280-spi.c b/drivers/iio/pressure/bmp280-spi.c
index a24ea5f62c5e..cfb6248ceb1f 100644
--- a/drivers/iio/pressure/bmp280-spi.c
+++ b/drivers/iio/pressure/bmp280-spi.c
@@ -44,7 +44,8 @@ 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 const struct of_device_id bmp280_of_spi_match[] = {
diff --git a/drivers/iio/pressure/bmp280.h b/drivers/iio/pressure/bmp280.h
index 9249956bc8bf..ad0e5778c6b5 100644
--- a/drivers/iio/pressure/bmp280.h
+++ b/drivers/iio/pressure/bmp280.h
@@ -82,4 +82,5 @@ 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);
--
2.4.11
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