// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2012 Invensense, Inc. */ #include <linux/pm_runtime.h> #include <linux/iio/common/inv_sensors_timestamp.h> #include "inv_mpu_iio.h" static unsigned int inv_scan_query_mpu6050(struct iio_dev *indio_dev) { struct inv_mpu6050_state *st = iio_priv(indio_dev); unsigned int mask; /* * If the MPU6050 is just used as a trigger, then the scan mask * is not allocated so we simply enable the temperature channel * as a dummy and bail out. */ if (!indio_dev->active_scan_mask) { st->chip_config.temp_fifo_enable = true; return INV_MPU6050_SENSOR_TEMP; } st->chip_config.gyro_fifo_enable = test_bit(INV_MPU6050_SCAN_GYRO_X, indio_dev->active_scan_mask) || test_bit(INV_MPU6050_SCAN_GYRO_Y, indio_dev->active_scan_mask) || test_bit(INV_MPU6050_SCAN_GYRO_Z, indio_dev->active_scan_mask); st->chip_config.accl_fifo_enable = test_bit(INV_MPU6050_SCAN_ACCL_X, indio_dev->active_scan_mask) || test_bit(INV_MPU6050_SCAN_ACCL_Y, indio_dev->active_scan_mask) || test_bit(INV_MPU6050_SCAN_ACCL_Z, indio_dev->active_scan_mask); st->chip_config.temp_fifo_enable = test_bit(INV_MPU6050_SCAN_TEMP, indio_dev->active_scan_mask); mask = 0; if (st->chip_config.gyro_fifo_enable) mask |= INV_MPU6050_SENSOR_GYRO; if (st->chip_config.accl_fifo_enable) mask |= INV_MPU6050_SENSOR_ACCL; if (st->chip_config.temp_fifo_enable) mask |= INV_MPU6050_SENSOR_TEMP; return mask; } static unsigned int inv_scan_query_mpu9x50(struct iio_dev *indio_dev) { struct inv_mpu6050_state *st = iio_priv(indio_dev); unsigned int mask; mask = inv_scan_query_mpu6050(indio_dev); /* no magnetometer if i2c auxiliary bus is used */ if (st->magn_disabled) return mask; st->chip_config.magn_fifo_enable = test_bit(INV_MPU9X50_SCAN_MAGN_X, indio_dev->active_scan_mask) || test_bit(INV_MPU9X50_SCAN_MAGN_Y, indio_dev->active_scan_mask) || test_bit(INV_MPU9X50_SCAN_MAGN_Z, indio_dev->active_scan_mask); if (st->chip_config.magn_fifo_enable) mask |= INV_MPU6050_SENSOR_MAGN; return mask; } static unsigned int inv_scan_query(struct iio_dev *indio_dev) { struct inv_mpu6050_state *st = iio_priv(indio_dev); switch (st->chip_type) { case INV_MPU9150: case INV_MPU9250: case INV_MPU9255: return inv_scan_query_mpu9x50(indio_dev); default: return inv_scan_query_mpu6050(indio_dev); } } static unsigned int inv_compute_skip_samples(const struct inv_mpu6050_state *st) { unsigned int skip_samples = 0; /* mag first sample is always not ready, skip it */ if (st->chip_config.magn_fifo_enable) skip_samples = 1; return skip_samples; } int inv_mpu6050_prepare_fifo(struct inv_mpu6050_state *st, bool enable) { uint8_t d; int ret; if (enable) { /* reset timestamping */ inv_sensors_timestamp_reset(&st->timestamp); /* reset FIFO */ d = st->chip_config.user_ctrl | INV_MPU6050_BIT_FIFO_RST; ret = regmap_write(st->map, st->reg->user_ctrl, d); if (ret) return ret; /* enable sensor output to FIFO */ d = 0; if (st->chip_config.gyro_fifo_enable) d |= INV_MPU6050_BITS_GYRO_OUT; if (st->chip_config.accl_fifo_enable) d |= INV_MPU6050_BIT_ACCEL_OUT; if (st->chip_config.temp_fifo_enable) d |= INV_MPU6050_BIT_TEMP_OUT; if (st->chip_config.magn_fifo_enable) d |= INV_MPU6050_BIT_SLAVE_0; ret = regmap_write(st->map, st->reg->fifo_en, d); if (ret) return ret; /* enable FIFO reading */ d = st->chip_config.user_ctrl | INV_MPU6050_BIT_FIFO_EN; ret = regmap_write(st->map, st->reg->user_ctrl, d); if (ret) return ret; /* enable interrupt */ ret = regmap_write(st->map, st->reg->int_enable, INV_MPU6050_BIT_DATA_RDY_EN); } else { ret = regmap_write(st->map, st->reg->int_enable, 0); if (ret) return ret; ret = regmap_write(st->map, st->reg->fifo_en, 0); if (ret) return ret; /* restore user_ctrl for disabling FIFO reading */ ret = regmap_write(st->map, st->reg->user_ctrl, st->chip_config.user_ctrl); } return ret; } /** * inv_mpu6050_set_enable() - enable chip functions. * @indio_dev: Device driver instance. * @enable: enable/disable */ static int inv_mpu6050_set_enable(struct iio_dev *indio_dev, bool enable) { struct inv_mpu6050_state *st = iio_priv(indio_dev); struct device *pdev = regmap_get_device(st->map); unsigned int scan; int result; if (enable) { scan = inv_scan_query(indio_dev); result = pm_runtime_resume_and_get(pdev); if (result) return result; /* * In case autosuspend didn't trigger, turn off first not * required sensors. */ result = inv_mpu6050_switch_engine(st, false, ~scan); if (result) goto error_power_off; result = inv_mpu6050_switch_engine(st, true, scan); if (result) goto error_power_off; st->skip_samples = inv_compute_skip_samples(st); result = inv_mpu6050_prepare_fifo(st, true); if (result) goto error_power_off; } else { result = inv_mpu6050_prepare_fifo(st, false); if (result) goto error_power_off; pm_runtime_mark_last_busy(pdev); pm_runtime_put_autosuspend(pdev); } return 0; error_power_off: pm_runtime_put_autosuspend(pdev); return result; } /** * inv_mpu_data_rdy_trigger_set_state() - set data ready interrupt state * @trig: Trigger instance * @state: Desired trigger state */ static int inv_mpu_data_rdy_trigger_set_state(struct iio_trigger *trig, bool state) { struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); struct inv_mpu6050_state *st = iio_priv(indio_dev); int result; mutex_lock(&st->lock); result = inv_mpu6050_set_enable(indio_dev, state); mutex_unlock(&st->lock); return result; } static const struct iio_trigger_ops inv_mpu_trigger_ops = { .set_trigger_state = &inv_mpu_data_rdy_trigger_set_state, }; int inv_mpu6050_probe_trigger(struct iio_dev *indio_dev, int irq_type) { int ret; struct inv_mpu6050_state *st = iio_priv(indio_dev); st->trig = devm_iio_trigger_alloc(&indio_dev->dev, "%s-dev%d", indio_dev->name, iio_device_id(indio_dev)); if (!st->trig) return -ENOMEM; ret = devm_request_irq(&indio_dev->dev, st->irq, &iio_trigger_generic_data_rdy_poll, irq_type, "inv_mpu", st->trig); if (ret) return ret; st->trig->dev.parent = regmap_get_device(st->map); st->trig->ops = &inv_mpu_trigger_ops; iio_trigger_set_drvdata(st->trig, indio_dev); ret = devm_iio_trigger_register(&indio_dev->dev, st->trig); if (ret) return ret; indio_dev->trig = iio_trigger_get(st->trig); return 0; }