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iio: imu: inv_icm42600: add device interrupt

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Add INT1 interrupt support. Support interrupt edge and level,
active high or low. Push-pull or open-drain configurations.

Interrupt will be used to read data from the FIFO.

Signed-off-by: Jean-Baptiste Maneyrol <jmaneyrol@invensense.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Jean-Baptiste Maneyrol 2020-06-22 17:37:25 +02:00 committed by Jonathan Cameron
parent 6c1b4524bf
commit e5efa1049b
4 changed files with 105 additions and 4 deletions
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2
drivers/iio/imu/inv_icm42600/inv_icm42600.h
View File

@ -372,7 +372,7 @@ int inv_icm42600_set_temp_conf(struct inv_icm42600_state *st, bool enable,
int inv_icm42600_debugfs_reg(struct iio_dev *indio_dev, unsigned int reg,
unsigned int writeval, unsigned int *readval);
int inv_icm42600_core_probe(struct regmap *regmap, int chip,
int inv_icm42600_core_probe(struct regmap *regmap, int chip, int irq,
inv_icm42600_bus_setup bus_setup);
struct iio_dev *inv_icm42600_gyro_init(struct inv_icm42600_state *st);

101
drivers/iio/imu/inv_icm42600/inv_icm42600_core.c
View File

@ -9,8 +9,11 @@
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/mutex.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/regulator/consumer.h>
#include <linux/pm_runtime.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/iio/iio.h>
@ -408,6 +411,82 @@ static int inv_icm42600_setup(struct inv_icm42600_state *st,
return inv_icm42600_set_conf(st, hw->conf);
}
static irqreturn_t inv_icm42600_irq_handler(int irq, void *_data)
{
struct inv_icm42600_state *st = _data;
struct device *dev = regmap_get_device(st->map);
unsigned int status;
int ret;
mutex_lock(&st->lock);
ret = regmap_read(st->map, INV_ICM42600_REG_INT_STATUS, &status);
if (ret)
goto out_unlock;
/* FIFO full */
if (status & INV_ICM42600_INT_STATUS_FIFO_FULL)
dev_warn(dev, "FIFO full data lost!\n");
out_unlock:
mutex_unlock(&st->lock);
return IRQ_HANDLED;
}
/**
* inv_icm42600_irq_init() - initialize int pin and interrupt handler
* @st: driver internal state
* @irq: irq number
* @irq_type: irq trigger type
* @open_drain: true if irq is open drain, false for push-pull
*
* Returns 0 on success, a negative error code otherwise.
*/
static int inv_icm42600_irq_init(struct inv_icm42600_state *st, int irq,
int irq_type, bool open_drain)
{
struct device *dev = regmap_get_device(st->map);
unsigned int val;
int ret;
/* configure INT1 interrupt: default is active low on edge */
switch (irq_type) {
case IRQF_TRIGGER_RISING:
case IRQF_TRIGGER_HIGH:
val = INV_ICM42600_INT_CONFIG_INT1_ACTIVE_HIGH;
break;
default:
val = INV_ICM42600_INT_CONFIG_INT1_ACTIVE_LOW;
break;
}
switch (irq_type) {
case IRQF_TRIGGER_LOW:
case IRQF_TRIGGER_HIGH:
val |= INV_ICM42600_INT_CONFIG_INT1_LATCHED;
break;
default:
break;
}
if (!open_drain)
val |= INV_ICM42600_INT_CONFIG_INT1_PUSH_PULL;
ret = regmap_write(st->map, INV_ICM42600_REG_INT_CONFIG, val);
if (ret)
return ret;
/* Deassert async reset for proper INT pin operation (cf datasheet) */
ret = regmap_update_bits(st->map, INV_ICM42600_REG_INT_CONFIG1,
INV_ICM42600_INT_CONFIG1_ASYNC_RESET, 0);
if (ret)
return ret;
return devm_request_threaded_irq(dev, irq, NULL,
inv_icm42600_irq_handler, irq_type,
"inv_icm42600", st);
}
static int inv_icm42600_enable_regulator_vddio(struct inv_icm42600_state *st)
{
int ret;
@ -452,11 +531,14 @@ static void inv_icm42600_disable_pm(void *_data)
pm_runtime_disable(dev);
}
int inv_icm42600_core_probe(struct regmap *regmap, int chip,
int inv_icm42600_core_probe(struct regmap *regmap, int chip, int irq,
inv_icm42600_bus_setup bus_setup)
{
struct device *dev = regmap_get_device(regmap);
struct inv_icm42600_state *st;
struct irq_data *irq_desc;
int irq_type;
bool open_drain;
int ret;
if (chip < 0 || chip >= INV_CHIP_NB) {
@ -464,6 +546,19 @@ int inv_icm42600_core_probe(struct regmap *regmap, int chip,
return -ENODEV;
}
/* get irq properties, set trigger falling by default */
irq_desc = irq_get_irq_data(irq);
if (!irq_desc) {
dev_err(dev, "could not find IRQ %d\n", irq);
return -EINVAL;
}
irq_type = irqd_get_trigger_type(irq_desc);
if (!irq_type)
irq_type = IRQF_TRIGGER_FALLING;
open_drain = device_property_read_bool(dev, "drive-open-drain");
st = devm_kzalloc(dev, sizeof(*st), GFP_KERNEL);
if (!st)
return -ENOMEM;
@ -517,6 +612,10 @@ int inv_icm42600_core_probe(struct regmap *regmap, int chip,
if (IS_ERR(st->indio_accel))
return PTR_ERR(st->indio_accel);
ret = inv_icm42600_irq_init(st, irq, irq_type, open_drain);
if (ret)
return ret;
/* setup runtime power management */
ret = pm_runtime_set_active(dev);
if (ret)

3
drivers/iio/imu/inv_icm42600/inv_icm42600_i2c.c
View File

@ -64,7 +64,8 @@ static int inv_icm42600_probe(struct i2c_client *client)
if (IS_ERR(regmap))
return PTR_ERR(regmap);
return inv_icm42600_core_probe(regmap, chip, inv_icm42600_i2c_bus_setup);
return inv_icm42600_core_probe(regmap, chip, client->irq,
inv_icm42600_i2c_bus_setup);
}
static const struct of_device_id inv_icm42600_of_matches[] = {

3
drivers/iio/imu/inv_icm42600/inv_icm42600_spi.c
View File

@ -63,7 +63,8 @@ static int inv_icm42600_probe(struct spi_device *spi)
if (IS_ERR(regmap))
return PTR_ERR(regmap);
return inv_icm42600_core_probe(regmap, chip, inv_icm42600_spi_bus_setup);
return inv_icm42600_core_probe(regmap, chip, spi->irq,
inv_icm42600_spi_bus_setup);
}
static const struct of_device_id inv_icm42600_of_matches[] = {