[PATCH 3/4] iio: accel: adxl345: Setup DATA_READY trigger

From: Eva Rachel Retuya
Date: Mon Mar 13 2017 - 07:12:39 EST

Signed-off-by: Eva Rachel Retuya <eraretuya@xxxxxxxxx>
---
drivers/iio/accel/adxl345.h | 4 +-
drivers/iio/accel/adxl345_core.c | 113 +++++++++++++++++++++++++++++++++++++--
drivers/iio/accel/adxl345_i2c.c | 10 +++-
drivers/iio/accel/adxl345_spi.c | 10 +++-
4 files changed, 130 insertions(+), 7 deletions(-)

diff --git a/drivers/iio/accel/adxl345.h b/drivers/iio/accel/adxl345.h
index c1ddf39..f28a503 100644
--- a/drivers/iio/accel/adxl345.h
+++ b/drivers/iio/accel/adxl345.h
@@ -11,8 +11,8 @@
#ifndef _ADXL345_H_
#define _ADXL345_H_

-int adxl345_core_probe(struct device *dev, struct regmap *regmap,
- const char *name);
+int adxl345_core_probe(struct device *dev, struct regmap *regmap, int irq,
+ const char *name, bool use_int2);
int adxl345_core_remove(struct device *dev);

#endif /* _ADXL345_H_ */
diff --git a/drivers/iio/accel/adxl345_core.c b/drivers/iio/accel/adxl345_core.c
index 7eee31d..4b7055c 100644
--- a/drivers/iio/accel/adxl345_core.c
+++ b/drivers/iio/accel/adxl345_core.c
@@ -9,15 +9,19 @@
*/

#include <linux/delay.h>
+#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/regmap.h>

#include <linux/iio/iio.h>
+#include <linux/iio/trigger.h>

#include "adxl345.h"

#define ADXL345_REG_DEVID 0x00
#define ADXL345_REG_POWER_CTL 0x2D
+#define ADXL345_REG_INT_ENABLE 0x2E
+#define ADXL345_REG_INT_MAP 0x2F
#define ADXL345_REG_INT_SOURCE 0x30
#define ADXL345_REG_DATA_FORMAT 0x31
#define ADXL345_REG_DATAX0 0x32
@@ -39,6 +43,8 @@

#define ADXL345_DEVID 0xE5

+#define ADXL345_IRQ_NAME "adxl345_event"
+
/*
* In full-resolution mode, scale factor is maintained at ~4 mg/LSB
* in all g ranges.
@@ -49,7 +55,9 @@
static const int adxl345_uscale = 38300;

struct adxl345_data {
+ struct iio_trigger *drdy_trig;
struct regmap *regmap;
+ bool drdy_trig_on;
u8 data_range;
};

@@ -167,13 +175,57 @@ static int adxl345_read_raw(struct iio_dev *indio_dev,
return -EINVAL;
}

+static irqreturn_t adxl345_irq(int irq, void *p)
+{
+ struct iio_dev *indio_dev = p;
+ struct adxl345_data *data = iio_priv(indio_dev);
+ int ret = IRQ_NONE;
+ u32 int_stat;
+
+ ret = regmap_read(data->regmap, ADXL345_REG_INT_SOURCE, &int_stat);
+ if (ret < 0)
+ return ret;
+
+ if (int_stat & ADXL345_INT_DATA_READY) {
+ iio_trigger_poll(data->drdy_trig);
+ ret = IRQ_HANDLED;
+ }
+
+ return ret;
+}
+
+static int adxl345_drdy_trigger_set_state(struct iio_trigger *trig, bool state)
+{
+ struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
+ struct adxl345_data *data = iio_priv(indio_dev);
+ struct device *dev;
+ int ret;
+
+ dev = regmap_get_device(data->regmap);
+ ret = regmap_update_bits(data->regmap, ADXL345_REG_INT_ENABLE,
+ ADXL345_INT_DATA_READY, (state ?
+ ADXL345_INT_DATA_READY : 0));
+ if (ret < 0) {
+ dev_err(dev, "Failed to update INT_ENABLE bits\n");
+ return ret;
+ }
+ data->drdy_trig_on = state;
+
+ return ret;
+}
+
+static const struct iio_trigger_ops adxl345_trigger_ops = {
+ .owner = THIS_MODULE,
+ .set_trigger_state = adxl345_drdy_trigger_set_state,
+};
+
static const struct iio_info adxl345_info = {
.driver_module = THIS_MODULE,
.read_raw = adxl345_read_raw,
};

-int adxl345_core_probe(struct device *dev, struct regmap *regmap,
- const char *name)
+int adxl345_core_probe(struct device *dev, struct regmap *regmap, int irq,
+ const char *name, bool use_int2)
{
struct adxl345_data *data;
struct iio_dev *indio_dev;
@@ -212,6 +264,20 @@ int adxl345_core_probe(struct device *dev, struct regmap *regmap,
return ret;
}

+ /*
+ * Any bits set to 0 send their respective interrupts to the INT1 pin,
+ * whereas bits set to 1 send their respective interrupts to the INT2
+ * pin. Map all interrupts to the specified pin.
+ */
+ if (!use_int2)
+ ret = regmap_write(data->regmap, ADXL345_REG_INT_MAP, 0x00);
+ else
+ ret = regmap_write(data->regmap, ADXL345_REG_INT_MAP, 0xFF);
+ if (ret < 0) {
+ dev_err(dev, "Failed to set up interrupts: %d\n", ret);
+ return ret;
+ }
+
indio_dev->dev.parent = dev;
indio_dev->name = name;
indio_dev->info = &adxl345_info;
@@ -219,7 +285,46 @@ int adxl345_core_probe(struct device *dev, struct regmap *regmap,
indio_dev->channels = adxl345_channels;
indio_dev->num_channels = ARRAY_SIZE(adxl345_channels);

- return iio_device_register(indio_dev);
+ if (irq > 0) {
+ ret =
+ devm_request_threaded_irq(dev, irq, NULL, adxl345_irq,
+ IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
+ ADXL345_IRQ_NAME, indio_dev);
+ if (ret < 0) {
+ dev_err(dev, "Failed to request irq: %d\n", irq);
+ return ret;
+ }
+
+ data->drdy_trig = devm_iio_trigger_alloc(dev, "%s-dev%d",
+ indio_dev->name,
+ indio_dev->id);
+ if (!data->drdy_trig)
+ return -ENOMEM;
+
+ data->drdy_trig->dev.parent = dev;
+ data->drdy_trig->ops = &adxl345_trigger_ops;
+ iio_trigger_set_drvdata(data->drdy_trig, indio_dev);
+
+ ret = iio_trigger_register(data->drdy_trig);
+ if (ret) {
+ dev_err(dev, "Failed to register trigger: %d\n", ret);
+ return ret;
+ }
+ }
+
+ ret = iio_device_register(indio_dev);
+ if (ret < 0) {
+ dev_err(dev, "iio_device_register failed: %d\n", ret);
+ goto err_trigger_unregister;
+ }
+
+ return ret;
+
+err_trigger_unregister:
+ if (data->drdy_trig)
+ iio_trigger_unregister(data->drdy_trig);
+
+ return ret;
}
EXPORT_SYMBOL_GPL(adxl345_core_probe);

@@ -229,6 +334,8 @@ int adxl345_core_remove(struct device *dev)
struct adxl345_data *data = iio_priv(indio_dev);

iio_device_unregister(indio_dev);
+ if (data->drdy_trig)
+ iio_trigger_unregister(data->drdy_trig);

return adxl345_set_mode(data, ADXL345_POWER_CTL_STANDBY);
}
diff --git a/drivers/iio/accel/adxl345_i2c.c b/drivers/iio/accel/adxl345_i2c.c
index 05e1ec4..8c791b8 100644
--- a/drivers/iio/accel/adxl345_i2c.c
+++ b/drivers/iio/accel/adxl345_i2c.c
@@ -13,6 +13,7 @@

#include <linux/i2c.h>
#include <linux/module.h>
+#include <linux/of_irq.h>
#include <linux/regmap.h>

#include "adxl345.h"
@@ -26,6 +27,8 @@ static int adxl345_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct regmap *regmap;
+ bool use_int2 = false;
+ int irq;

regmap = devm_regmap_init_i2c(client, &adxl345_i2c_regmap_config);
if (IS_ERR(regmap)) {
@@ -34,7 +37,12 @@ static int adxl345_i2c_probe(struct i2c_client *client,
return PTR_ERR(regmap);
}

- return adxl345_core_probe(&client->dev, regmap, id ? id->name : NULL);
+ irq = of_irq_get_byname(client->dev.of_node, "INT2");
+ if (irq == client->irq)
+ use_int2 = true;
+
+ return adxl345_core_probe(&client->dev, regmap, client->irq,
+ id ? id->name : NULL, use_int2);
}

static int adxl345_i2c_remove(struct i2c_client *client)
diff --git a/drivers/iio/accel/adxl345_spi.c b/drivers/iio/accel/adxl345_spi.c
index 6d65819..731d675 100644
--- a/drivers/iio/accel/adxl345_spi.c
+++ b/drivers/iio/accel/adxl345_spi.c
@@ -9,6 +9,7 @@
*/

#include <linux/module.h>
+#include <linux/of_irq.h>
#include <linux/regmap.h>
#include <linux/spi/spi.h>

@@ -27,6 +28,8 @@ static int adxl345_spi_probe(struct spi_device *spi)
{
const struct spi_device_id *id = spi_get_device_id(spi);
struct regmap *regmap;
+ bool use_int2 = false;
+ int irq;

/* Bail out if max_speed_hz exceeds 5 MHz */
if (spi->max_speed_hz > ADXL345_MAX_SPI_FREQ_HZ) {
@@ -42,7 +45,12 @@ static int adxl345_spi_probe(struct spi_device *spi)
return PTR_ERR(regmap);
}

- return adxl345_core_probe(&spi->dev, regmap, id->name);
+ irq = of_irq_get_byname(spi->dev.of_node, "INT2");
+ if (irq == spi->irq)
+ use_int2 = true;
+
+ return adxl345_core_probe(&spi->dev, regmap, spi->irq, id->name,
+ use_int2);
}

static int adxl345_spi_remove(struct spi_device *spi)
--
2.7.4