Commit 895bf81e authored by Martin Kelly's avatar Martin Kelly Committed by Jonathan Cameron

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: default avatarMartin Kelly <martin@martingkelly.com>
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 37402329
......@@ -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;
......
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