iio:bmi160: add drdy interrupt support
Add interrupt support for the data ready signal on the BMI160, which fires an interrupt whenever new accelerometer/gyroscope data is ready to read. Signed-off-by: Martin Kelly <martin@martingkelly.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Martin Kelly
Jonathan Cameron
parent
3740232925
commit
895bf81e6b
|
|
@ -2,9 +2,20 @@
|
|||
#ifndef BMI160_H_
|
||||
#define BMI160_H_
|
||||
|
||||
#include <linux/iio/iio.h>
|
||||
|
||||
struct bmi160_data {
|
||||
struct regmap *regmap;
|
||||
struct iio_trigger *trig;
|
||||
};
|
||||
|
||||
extern const struct regmap_config bmi160_regmap_config;
|
||||
|
||||
int bmi160_core_probe(struct device *dev, struct regmap *regmap,
|
||||
const char *name, bool use_spi);
|
||||
|
||||
int bmi160_enable_irq(struct regmap *regmap, bool enable);
|
||||
|
||||
int bmi160_probe_trigger(struct iio_dev *indio_dev, int irq, u32 irq_type);
|
||||
|
||||
#endif /* BMI160_H_ */
|
||||
|
|
|
|||
|
|
@ -3,21 +3,25 @@
|
|||
* BMI160 - Bosch IMU (accel, gyro plus external magnetometer)
|
||||
*
|
||||
* Copyright (c) 2016, Intel Corporation.
|
||||
* Copyright (c) 2019, Martin Kelly.
|
||||
*
|
||||
* IIO core driver for BMI160, with support for I2C/SPI busses
|
||||
*
|
||||
* TODO: magnetometer, interrupts, hardware FIFO
|
||||
* TODO: magnetometer, hardware FIFO
|
||||
*/
|
||||
#include <linux/module.h>
|
||||
#include <linux/regmap.h>
|
||||
#include <linux/acpi.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/irq.h>
|
||||
#include <linux/of_irq.h>
|
||||
|
||||
#include <linux/iio/iio.h>
|
||||
#include <linux/iio/triggered_buffer.h>
|
||||
#include <linux/iio/trigger_consumer.h>
|
||||
#include <linux/iio/buffer.h>
|
||||
#include <linux/iio/sysfs.h>
|
||||
#include <linux/iio/trigger.h>
|
||||
|
||||
#include "bmi160.h"
|
||||
|
||||
|
|
@ -61,8 +65,32 @@
|
|||
#define BMI160_CMD_GYRO_PM_FAST_STARTUP 0x17
|
||||
#define BMI160_CMD_SOFTRESET 0xB6
|
||||
|
||||
#define BMI160_REG_INT_EN 0x51
|
||||
#define BMI160_DRDY_INT_EN BIT(4)
|
||||
|
||||
#define BMI160_REG_INT_OUT_CTRL 0x53
|
||||
#define BMI160_INT_OUT_CTRL_MASK 0x0f
|
||||
#define BMI160_INT1_OUT_CTRL_SHIFT 0
|
||||
#define BMI160_INT2_OUT_CTRL_SHIFT 4
|
||||
#define BMI160_EDGE_TRIGGERED BIT(0)
|
||||
#define BMI160_ACTIVE_HIGH BIT(1)
|
||||
#define BMI160_OPEN_DRAIN BIT(2)
|
||||
#define BMI160_OUTPUT_EN BIT(3)
|
||||
|
||||
#define BMI160_REG_INT_LATCH 0x54
|
||||
#define BMI160_INT1_LATCH_MASK BIT(4)
|
||||
#define BMI160_INT2_LATCH_MASK BIT(5)
|
||||
|
||||
/* INT1 and INT2 are in the opposite order as in INT_OUT_CTRL! */
|
||||
#define BMI160_REG_INT_MAP 0x56
|
||||
#define BMI160_INT1_MAP_DRDY_EN 0x80
|
||||
#define BMI160_INT2_MAP_DRDY_EN 0x08
|
||||
|
||||
#define BMI160_REG_DUMMY 0x7F
|
||||
|
||||
#define BMI160_NORMAL_WRITE_USLEEP 2
|
||||
#define BMI160_SUSPENDED_WRITE_USLEEP 450
|
||||
|
||||
#define BMI160_ACCEL_PMU_MIN_USLEEP 3800
|
||||
#define BMI160_GYRO_PMU_MIN_USLEEP 80000
|
||||
#define BMI160_SOFTRESET_USLEEP 1000
|
||||
|
|
@ -105,8 +133,9 @@ enum bmi160_sensor_type {
|
|||
BMI160_NUM_SENSORS /* must be last */
|
||||
};
|
||||
|
||||
struct bmi160_data {
|
||||
struct regmap *regmap;
|
||||
enum bmi160_int_pin {
|
||||
BMI160_PIN_INT1,
|
||||
BMI160_PIN_INT2
|
||||
};
|
||||
|
||||
const struct regmap_config bmi160_regmap_config = {
|
||||
|
|
@ -495,6 +524,186 @@ static const char *bmi160_match_acpi_device(struct device *dev)
|
|||
return dev_name(dev);
|
||||
}
|
||||
|
||||
static int bmi160_write_conf_reg(struct regmap *regmap, unsigned int reg,
|
||||
unsigned int mask, unsigned int bits,
|
||||
unsigned int write_usleep)
|
||||
{
|
||||
int ret;
|
||||
unsigned int val;
|
||||
|
||||
ret = regmap_read(regmap, reg, &val);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
val = (val & ~mask) | bits;
|
||||
|
||||
ret = regmap_write(regmap, reg, val);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
/*
|
||||
* We need to wait after writing before we can write again. See the
|
||||
* datasheet, page 93.
|
||||
*/
|
||||
usleep_range(write_usleep, write_usleep + 1000);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int bmi160_config_pin(struct regmap *regmap, enum bmi160_int_pin pin,
|
||||
bool open_drain, u8 irq_mask,
|
||||
unsigned long write_usleep)
|
||||
{
|
||||
int ret;
|
||||
struct device *dev = regmap_get_device(regmap);
|
||||
u8 int_out_ctrl_shift;
|
||||
u8 int_latch_mask;
|
||||
u8 int_map_mask;
|
||||
u8 int_out_ctrl_mask;
|
||||
u8 int_out_ctrl_bits;
|
||||
const char *pin_name;
|
||||
|
||||
switch (pin) {
|
||||
case BMI160_PIN_INT1:
|
||||
int_out_ctrl_shift = BMI160_INT1_OUT_CTRL_SHIFT;
|
||||
int_latch_mask = BMI160_INT1_LATCH_MASK;
|
||||
int_map_mask = BMI160_INT1_MAP_DRDY_EN;
|
||||
break;
|
||||
case BMI160_PIN_INT2:
|
||||
int_out_ctrl_shift = BMI160_INT2_OUT_CTRL_SHIFT;
|
||||
int_latch_mask = BMI160_INT2_LATCH_MASK;
|
||||
int_map_mask = BMI160_INT2_MAP_DRDY_EN;
|
||||
break;
|
||||
}
|
||||
int_out_ctrl_mask = BMI160_INT_OUT_CTRL_MASK << int_out_ctrl_shift;
|
||||
|
||||
/*
|
||||
* Enable the requested pin with the right settings:
|
||||
* - Push-pull/open-drain
|
||||
* - Active low/high
|
||||
* - Edge/level triggered
|
||||
*/
|
||||
int_out_ctrl_bits = BMI160_OUTPUT_EN;
|
||||
if (open_drain)
|
||||
/* Default is push-pull. */
|
||||
int_out_ctrl_bits |= BMI160_OPEN_DRAIN;
|
||||
int_out_ctrl_bits |= irq_mask;
|
||||
int_out_ctrl_bits <<= int_out_ctrl_shift;
|
||||
|
||||
ret = bmi160_write_conf_reg(regmap, BMI160_REG_INT_OUT_CTRL,
|
||||
int_out_ctrl_mask, int_out_ctrl_bits,
|
||||
write_usleep);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
/* Set the pin to input mode with no latching. */
|
||||
ret = bmi160_write_conf_reg(regmap, BMI160_REG_INT_LATCH,
|
||||
int_latch_mask, int_latch_mask,
|
||||
write_usleep);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
/* Map interrupts to the requested pin. */
|
||||
ret = bmi160_write_conf_reg(regmap, BMI160_REG_INT_MAP,
|
||||
int_map_mask, int_map_mask,
|
||||
write_usleep);
|
||||
if (ret) {
|
||||
switch (pin) {
|
||||
case BMI160_PIN_INT1:
|
||||
pin_name = "INT1";
|
||||
break;
|
||||
case BMI160_PIN_INT2:
|
||||
pin_name = "INT2";
|
||||
break;
|
||||
}
|
||||
dev_err(dev, "Failed to configure %s IRQ pin", pin_name);
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
int bmi160_enable_irq(struct regmap *regmap, bool enable)
|
||||
{
|
||||
unsigned int enable_bit = 0;
|
||||
|
||||
if (enable)
|
||||
enable_bit = BMI160_DRDY_INT_EN;
|
||||
|
||||
return bmi160_write_conf_reg(regmap, BMI160_REG_INT_EN,
|
||||
BMI160_DRDY_INT_EN, enable_bit,
|
||||
BMI160_NORMAL_WRITE_USLEEP);
|
||||
}
|
||||
EXPORT_SYMBOL(bmi160_enable_irq);
|
||||
|
||||
static int bmi160_get_irq(struct device_node *of_node, enum bmi160_int_pin *pin)
|
||||
{
|
||||
int irq;
|
||||
|
||||
/* Use INT1 if possible, otherwise fall back to INT2. */
|
||||
irq = of_irq_get_byname(of_node, "INT1");
|
||||
if (irq > 0) {
|
||||
*pin = BMI160_PIN_INT1;
|
||||
return irq;
|
||||
}
|
||||
|
||||
irq = of_irq_get_byname(of_node, "INT2");
|
||||
if (irq > 0)
|
||||
*pin = BMI160_PIN_INT2;
|
||||
|
||||
return irq;
|
||||
}
|
||||
|
||||
static int bmi160_config_device_irq(struct iio_dev *indio_dev, int irq_type,
|
||||
enum bmi160_int_pin pin)
|
||||
{
|
||||
bool open_drain;
|
||||
u8 irq_mask;
|
||||
struct bmi160_data *data = iio_priv(indio_dev);
|
||||
struct device *dev = regmap_get_device(data->regmap);
|
||||
|
||||
/* Level-triggered, active-low is the default if we set all zeroes. */
|
||||
if (irq_type == IRQF_TRIGGER_RISING)
|
||||
irq_mask = BMI160_ACTIVE_HIGH | BMI160_EDGE_TRIGGERED;
|
||||
else if (irq_type == IRQF_TRIGGER_FALLING)
|
||||
irq_mask = BMI160_EDGE_TRIGGERED;
|
||||
else if (irq_type == IRQF_TRIGGER_HIGH)
|
||||
irq_mask = BMI160_ACTIVE_HIGH;
|
||||
else if (irq_type == IRQF_TRIGGER_LOW)
|
||||
irq_mask = 0;
|
||||
else {
|
||||
dev_err(&indio_dev->dev,
|
||||
"Invalid interrupt type 0x%x specified\n", irq_type);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
open_drain = of_property_read_bool(dev->of_node, "drive-open-drain");
|
||||
|
||||
return bmi160_config_pin(data->regmap, pin, open_drain, irq_mask,
|
||||
BMI160_NORMAL_WRITE_USLEEP);
|
||||
}
|
||||
|
||||
static int bmi160_setup_irq(struct iio_dev *indio_dev, int irq,
|
||||
enum bmi160_int_pin pin)
|
||||
{
|
||||
struct irq_data *desc;
|
||||
u32 irq_type;
|
||||
int ret;
|
||||
|
||||
desc = irq_get_irq_data(irq);
|
||||
if (!desc) {
|
||||
dev_err(&indio_dev->dev, "Could not find IRQ %d\n", irq);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
irq_type = irqd_get_trigger_type(desc);
|
||||
|
||||
ret = bmi160_config_device_irq(indio_dev, irq_type, pin);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
return bmi160_probe_trigger(indio_dev, irq, irq_type);
|
||||
}
|
||||
|
||||
static int bmi160_chip_init(struct bmi160_data *data, bool use_spi)
|
||||
{
|
||||
int ret;
|
||||
|
|
@ -539,6 +748,49 @@ static int bmi160_chip_init(struct bmi160_data *data, bool use_spi)
|
|||
return 0;
|
||||
}
|
||||
|
||||
static int bmi160_data_rdy_trigger_set_state(struct iio_trigger *trig,
|
||||
bool enable)
|
||||
{
|
||||
struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
|
||||
struct bmi160_data *data = iio_priv(indio_dev);
|
||||
|
||||
return bmi160_enable_irq(data->regmap, enable);
|
||||
}
|
||||
|
||||
static const struct iio_trigger_ops bmi160_trigger_ops = {
|
||||
.set_trigger_state = &bmi160_data_rdy_trigger_set_state,
|
||||
};
|
||||
|
||||
int bmi160_probe_trigger(struct iio_dev *indio_dev, int irq, u32 irq_type)
|
||||
{
|
||||
struct bmi160_data *data = iio_priv(indio_dev);
|
||||
int ret;
|
||||
|
||||
data->trig = devm_iio_trigger_alloc(&indio_dev->dev, "%s-dev%d",
|
||||
indio_dev->name, indio_dev->id);
|
||||
|
||||
if (data->trig == NULL)
|
||||
return -ENOMEM;
|
||||
|
||||
ret = devm_request_irq(&indio_dev->dev, irq,
|
||||
&iio_trigger_generic_data_rdy_poll,
|
||||
irq_type, "bmi160", data->trig);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
data->trig->dev.parent = regmap_get_device(data->regmap);
|
||||
data->trig->ops = &bmi160_trigger_ops;
|
||||
iio_trigger_set_drvdata(data->trig, indio_dev);
|
||||
|
||||
ret = devm_iio_trigger_register(&indio_dev->dev, data->trig);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
indio_dev->trig = iio_trigger_get(data->trig);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void bmi160_chip_uninit(void *data)
|
||||
{
|
||||
struct bmi160_data *bmi_data = data;
|
||||
|
|
@ -552,6 +804,8 @@ int bmi160_core_probe(struct device *dev, struct regmap *regmap,
|
|||
{
|
||||
struct iio_dev *indio_dev;
|
||||
struct bmi160_data *data;
|
||||
int irq;
|
||||
enum bmi160_int_pin int_pin;
|
||||
int ret;
|
||||
|
||||
indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
|
||||
|
|
@ -585,6 +839,16 @@ int bmi160_core_probe(struct device *dev, struct regmap *regmap,
|
|||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
irq = bmi160_get_irq(dev->of_node, &int_pin);
|
||||
if (irq > 0) {
|
||||
ret = bmi160_setup_irq(indio_dev, irq, int_pin);
|
||||
if (ret)
|
||||
dev_err(&indio_dev->dev, "Failed to setup IRQ %d\n",
|
||||
irq);
|
||||
} else {
|
||||
dev_info(&indio_dev->dev, "Not setting up IRQ trigger\n");
|
||||
}
|
||||
|
||||
ret = devm_iio_device_register(dev, indio_dev);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
|
|
|||
Loading…
Reference in New Issue