diff options
author | Jean-Baptiste Maneyrol <jmaneyrol@invensense.com> | 2020-06-22 17:37:25 +0200 |
---|---|---|
committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2020-06-27 14:21:45 +0100 |
commit | e5efa1049b9eb36c4fcf59a78b6f37e45fe5572d (patch) | |
tree | 4a49d87ccc306c72e8137aaeb4a89fff598b90ce | |
parent | 6c1b4524bfd97ddf37c60a90c2c569d8dfca5685 (diff) | |
download | linux-e5efa1049b9eb36c4fcf59a78b6f37e45fe5572d.tar.bz2 |
iio: imu: inv_icm42600: add device interrupt
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>
-rw-r--r-- | drivers/iio/imu/inv_icm42600/inv_icm42600.h | 2 | ||||
-rw-r--r-- | drivers/iio/imu/inv_icm42600/inv_icm42600_core.c | 101 | ||||
-rw-r--r-- | drivers/iio/imu/inv_icm42600/inv_icm42600_i2c.c | 3 | ||||
-rw-r--r-- | drivers/iio/imu/inv_icm42600/inv_icm42600_spi.c | 3 |
4 files changed, 105 insertions, 4 deletions
diff --git a/drivers/iio/imu/inv_icm42600/inv_icm42600.h b/drivers/iio/imu/inv_icm42600/inv_icm42600.h index 3b190461a2b6..148894c888cc 100644 --- a/drivers/iio/imu/inv_icm42600/inv_icm42600.h +++ b/drivers/iio/imu/inv_icm42600/inv_icm42600.h @@ -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); diff --git a/drivers/iio/imu/inv_icm42600/inv_icm42600_core.c b/drivers/iio/imu/inv_icm42600/inv_icm42600_core.c index a35ff21f50bb..95b2a6d91e5b 100644 --- a/drivers/iio/imu/inv_icm42600/inv_icm42600_core.c +++ b/drivers/iio/imu/inv_icm42600/inv_icm42600_core.c @@ -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) diff --git a/drivers/iio/imu/inv_icm42600/inv_icm42600_i2c.c b/drivers/iio/imu/inv_icm42600/inv_icm42600_i2c.c index 4789cead23b3..85b1934cec60 100644 --- a/drivers/iio/imu/inv_icm42600/inv_icm42600_i2c.c +++ b/drivers/iio/imu/inv_icm42600/inv_icm42600_i2c.c @@ -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[] = { diff --git a/drivers/iio/imu/inv_icm42600/inv_icm42600_spi.c b/drivers/iio/imu/inv_icm42600/inv_icm42600_spi.c index a9c5e2fdbe2a..323789697a08 100644 --- a/drivers/iio/imu/inv_icm42600/inv_icm42600_spi.c +++ b/drivers/iio/imu/inv_icm42600/inv_icm42600_spi.c @@ -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[] = { |