// SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright (C) 2020 Invensense, Inc. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "inv_icm42600.h" #include "inv_icm42600_buffer.h" #include "inv_icm42600_timestamp.h" static const struct regmap_range_cfg inv_icm42600_regmap_ranges[] = { { .name = "user banks", .range_min = 0x0000, .range_max = 0x4FFF, .selector_reg = INV_ICM42600_REG_BANK_SEL, .selector_mask = INV_ICM42600_BANK_SEL_MASK, .selector_shift = 0, .window_start = 0, .window_len = 0x1000, }, }; const struct regmap_config inv_icm42600_regmap_config = { .reg_bits = 8, .val_bits = 8, .max_register = 0x4FFF, .ranges = inv_icm42600_regmap_ranges, .num_ranges = ARRAY_SIZE(inv_icm42600_regmap_ranges), }; EXPORT_SYMBOL_GPL(inv_icm42600_regmap_config); struct inv_icm42600_hw { uint8_t whoami; const char *name; const struct inv_icm42600_conf *conf; }; /* chip initial default configuration */ static const struct inv_icm42600_conf inv_icm42600_default_conf = { .gyro = { .mode = INV_ICM42600_SENSOR_MODE_OFF, .fs = INV_ICM42600_GYRO_FS_2000DPS, .odr = INV_ICM42600_ODR_50HZ, .filter = INV_ICM42600_FILTER_BW_ODR_DIV_2, }, .accel = { .mode = INV_ICM42600_SENSOR_MODE_OFF, .fs = INV_ICM42600_ACCEL_FS_16G, .odr = INV_ICM42600_ODR_50HZ, .filter = INV_ICM42600_FILTER_BW_ODR_DIV_2, }, .temp_en = false, }; static const struct inv_icm42600_hw inv_icm42600_hw[INV_CHIP_NB] = { [INV_CHIP_ICM42600] = { .whoami = INV_ICM42600_WHOAMI_ICM42600, .name = "icm42600", .conf = &inv_icm42600_default_conf, }, [INV_CHIP_ICM42602] = { .whoami = INV_ICM42600_WHOAMI_ICM42602, .name = "icm42602", .conf = &inv_icm42600_default_conf, }, [INV_CHIP_ICM42605] = { .whoami = INV_ICM42600_WHOAMI_ICM42605, .name = "icm42605", .conf = &inv_icm42600_default_conf, }, [INV_CHIP_ICM42622] = { .whoami = INV_ICM42600_WHOAMI_ICM42622, .name = "icm42622", .conf = &inv_icm42600_default_conf, }, }; const struct iio_mount_matrix * inv_icm42600_get_mount_matrix(const struct iio_dev *indio_dev, const struct iio_chan_spec *chan) { const struct inv_icm42600_state *st = iio_device_get_drvdata(indio_dev); return &st->orientation; } uint32_t inv_icm42600_odr_to_period(enum inv_icm42600_odr odr) { static uint32_t odr_periods[INV_ICM42600_ODR_NB] = { /* reserved values */ 0, 0, 0, /* 8kHz */ 125000, /* 4kHz */ 250000, /* 2kHz */ 500000, /* 1kHz */ 1000000, /* 200Hz */ 5000000, /* 100Hz */ 10000000, /* 50Hz */ 20000000, /* 25Hz */ 40000000, /* 12.5Hz */ 80000000, /* 6.25Hz */ 160000000, /* 3.125Hz */ 320000000, /* 1.5625Hz */ 640000000, /* 500Hz */ 2000000, }; return odr_periods[odr]; } static int inv_icm42600_set_pwr_mgmt0(struct inv_icm42600_state *st, enum inv_icm42600_sensor_mode gyro, enum inv_icm42600_sensor_mode accel, bool temp, unsigned int *sleep_ms) { enum inv_icm42600_sensor_mode oldgyro = st->conf.gyro.mode; enum inv_icm42600_sensor_mode oldaccel = st->conf.accel.mode; bool oldtemp = st->conf.temp_en; unsigned int sleepval; unsigned int val; int ret; /* if nothing changed, exit */ if (gyro == oldgyro && accel == oldaccel && temp == oldtemp) return 0; val = INV_ICM42600_PWR_MGMT0_GYRO(gyro) | INV_ICM42600_PWR_MGMT0_ACCEL(accel); if (!temp) val |= INV_ICM42600_PWR_MGMT0_TEMP_DIS; ret = regmap_write(st->map, INV_ICM42600_REG_PWR_MGMT0, val); if (ret) return ret; st->conf.gyro.mode = gyro; st->conf.accel.mode = accel; st->conf.temp_en = temp; /* compute required wait time for sensors to stabilize */ sleepval = 0; /* temperature stabilization time */ if (temp && !oldtemp) { if (sleepval < INV_ICM42600_TEMP_STARTUP_TIME_MS) sleepval = INV_ICM42600_TEMP_STARTUP_TIME_MS; } /* accel startup time */ if (accel != oldaccel && oldaccel == INV_ICM42600_SENSOR_MODE_OFF) { /* block any register write for at least 200 µs */ usleep_range(200, 300); if (sleepval < INV_ICM42600_ACCEL_STARTUP_TIME_MS) sleepval = INV_ICM42600_ACCEL_STARTUP_TIME_MS; } if (gyro != oldgyro) { /* gyro startup time */ if (oldgyro == INV_ICM42600_SENSOR_MODE_OFF) { /* block any register write for at least 200 µs */ usleep_range(200, 300); if (sleepval < INV_ICM42600_GYRO_STARTUP_TIME_MS) sleepval = INV_ICM42600_GYRO_STARTUP_TIME_MS; /* gyro stop time */ } else if (gyro == INV_ICM42600_SENSOR_MODE_OFF) { if (sleepval < INV_ICM42600_GYRO_STOP_TIME_MS) sleepval = INV_ICM42600_GYRO_STOP_TIME_MS; } } /* deferred sleep value if sleep pointer is provided or direct sleep */ if (sleep_ms) *sleep_ms = sleepval; else if (sleepval) msleep(sleepval); return 0; } int inv_icm42600_set_accel_conf(struct inv_icm42600_state *st, struct inv_icm42600_sensor_conf *conf, unsigned int *sleep_ms) { struct inv_icm42600_sensor_conf *oldconf = &st->conf.accel; unsigned int val; int ret; /* Sanitize missing values with current values */ if (conf->mode < 0) conf->mode = oldconf->mode; if (conf->fs < 0) conf->fs = oldconf->fs; if (conf->odr < 0) conf->odr = oldconf->odr; if (conf->filter < 0) conf->filter = oldconf->filter; /* set ACCEL_CONFIG0 register (accel fullscale & odr) */ if (conf->fs != oldconf->fs || conf->odr != oldconf->odr) { val = INV_ICM42600_ACCEL_CONFIG0_FS(conf->fs) | INV_ICM42600_ACCEL_CONFIG0_ODR(conf->odr); ret = regmap_write(st->map, INV_ICM42600_REG_ACCEL_CONFIG0, val); if (ret) return ret; oldconf->fs = conf->fs; oldconf->odr = conf->odr; } /* set GYRO_ACCEL_CONFIG0 register (accel filter) */ if (conf->filter != oldconf->filter) { val = INV_ICM42600_GYRO_ACCEL_CONFIG0_ACCEL_FILT(conf->filter) | INV_ICM42600_GYRO_ACCEL_CONFIG0_GYRO_FILT(st->conf.gyro.filter); ret = regmap_write(st->map, INV_ICM42600_REG_GYRO_ACCEL_CONFIG0, val); if (ret) return ret; oldconf->filter = conf->filter; } /* set PWR_MGMT0 register (accel sensor mode) */ return inv_icm42600_set_pwr_mgmt0(st, st->conf.gyro.mode, conf->mode, st->conf.temp_en, sleep_ms); } int inv_icm42600_set_gyro_conf(struct inv_icm42600_state *st, struct inv_icm42600_sensor_conf *conf, unsigned int *sleep_ms) { struct inv_icm42600_sensor_conf *oldconf = &st->conf.gyro; unsigned int val; int ret; /* sanitize missing values with current values */ if (conf->mode < 0) conf->mode = oldconf->mode; if (conf->fs < 0) conf->fs = oldconf->fs; if (conf->odr < 0) conf->odr = oldconf->odr; if (conf->filter < 0) conf->filter = oldconf->filter; /* set GYRO_CONFIG0 register (gyro fullscale & odr) */ if (conf->fs != oldconf->fs || conf->odr != oldconf->odr) { val = INV_ICM42600_GYRO_CONFIG0_FS(conf->fs) | INV_ICM42600_GYRO_CONFIG0_ODR(conf->odr); ret = regmap_write(st->map, INV_ICM42600_REG_GYRO_CONFIG0, val); if (ret) return ret; oldconf->fs = conf->fs; oldconf->odr = conf->odr; } /* set GYRO_ACCEL_CONFIG0 register (gyro filter) */ if (conf->filter != oldconf->filter) { val = INV_ICM42600_GYRO_ACCEL_CONFIG0_ACCEL_FILT(st->conf.accel.filter) | INV_ICM42600_GYRO_ACCEL_CONFIG0_GYRO_FILT(conf->filter); ret = regmap_write(st->map, INV_ICM42600_REG_GYRO_ACCEL_CONFIG0, val); if (ret) return ret; oldconf->filter = conf->filter; } /* set PWR_MGMT0 register (gyro sensor mode) */ return inv_icm42600_set_pwr_mgmt0(st, conf->mode, st->conf.accel.mode, st->conf.temp_en, sleep_ms); return 0; } int inv_icm42600_set_temp_conf(struct inv_icm42600_state *st, bool enable, unsigned int *sleep_ms) { return inv_icm42600_set_pwr_mgmt0(st, st->conf.gyro.mode, st->conf.accel.mode, enable, sleep_ms); } int inv_icm42600_debugfs_reg(struct iio_dev *indio_dev, unsigned int reg, unsigned int writeval, unsigned int *readval) { struct inv_icm42600_state *st = iio_device_get_drvdata(indio_dev); int ret; mutex_lock(&st->lock); if (readval) ret = regmap_read(st->map, reg, readval); else ret = regmap_write(st->map, reg, writeval); mutex_unlock(&st->lock); return ret; } static int inv_icm42600_set_conf(struct inv_icm42600_state *st, const struct inv_icm42600_conf *conf) { unsigned int val; int ret; /* set PWR_MGMT0 register (gyro & accel sensor mode, temp enabled) */ val = INV_ICM42600_PWR_MGMT0_GYRO(conf->gyro.mode) | INV_ICM42600_PWR_MGMT0_ACCEL(conf->accel.mode); if (!conf->temp_en) val |= INV_ICM42600_PWR_MGMT0_TEMP_DIS; ret = regmap_write(st->map, INV_ICM42600_REG_PWR_MGMT0, val); if (ret) return ret; /* set GYRO_CONFIG0 register (gyro fullscale & odr) */ val = INV_ICM42600_GYRO_CONFIG0_FS(conf->gyro.fs) | INV_ICM42600_GYRO_CONFIG0_ODR(conf->gyro.odr); ret = regmap_write(st->map, INV_ICM42600_REG_GYRO_CONFIG0, val); if (ret) return ret; /* set ACCEL_CONFIG0 register (accel fullscale & odr) */ val = INV_ICM42600_ACCEL_CONFIG0_FS(conf->accel.fs) | INV_ICM42600_ACCEL_CONFIG0_ODR(conf->accel.odr); ret = regmap_write(st->map, INV_ICM42600_REG_ACCEL_CONFIG0, val); if (ret) return ret; /* set GYRO_ACCEL_CONFIG0 register (gyro & accel filters) */ val = INV_ICM42600_GYRO_ACCEL_CONFIG0_ACCEL_FILT(conf->accel.filter) | INV_ICM42600_GYRO_ACCEL_CONFIG0_GYRO_FILT(conf->gyro.filter); ret = regmap_write(st->map, INV_ICM42600_REG_GYRO_ACCEL_CONFIG0, val); if (ret) return ret; /* update internal conf */ st->conf = *conf; return 0; } /** * inv_icm42600_setup() - check and setup chip * @st: driver internal state * @bus_setup: callback for setting up bus specific registers * * Returns 0 on success, a negative error code otherwise. */ static int inv_icm42600_setup(struct inv_icm42600_state *st, inv_icm42600_bus_setup bus_setup) { const struct inv_icm42600_hw *hw = &inv_icm42600_hw[st->chip]; const struct device *dev = regmap_get_device(st->map); unsigned int val; int ret; /* check chip self-identification value */ ret = regmap_read(st->map, INV_ICM42600_REG_WHOAMI, &val); if (ret) return ret; if (val != hw->whoami) { dev_err(dev, "invalid whoami %#02x expected %#02x (%s)\n", val, hw->whoami, hw->name); return -ENODEV; } st->name = hw->name; /* reset to make sure previous state are not there */ ret = regmap_write(st->map, INV_ICM42600_REG_DEVICE_CONFIG, INV_ICM42600_DEVICE_CONFIG_SOFT_RESET); if (ret) return ret; msleep(INV_ICM42600_RESET_TIME_MS); ret = regmap_read(st->map, INV_ICM42600_REG_INT_STATUS, &val); if (ret) return ret; if (!(val & INV_ICM42600_INT_STATUS_RESET_DONE)) { dev_err(dev, "reset error, reset done bit not set\n"); return -ENODEV; } /* set chip bus configuration */ ret = bus_setup(st); if (ret) return ret; /* sensor data in big-endian (default) */ ret = regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG0, INV_ICM42600_INTF_CONFIG0_SENSOR_DATA_ENDIAN, INV_ICM42600_INTF_CONFIG0_SENSOR_DATA_ENDIAN); if (ret) return ret; return inv_icm42600_set_conf(st, hw->conf); } static irqreturn_t inv_icm42600_irq_timestamp(int irq, void *_data) { struct inv_icm42600_state *st = _data; st->timestamp.gyro = iio_get_time_ns(st->indio_gyro); st->timestamp.accel = iio_get_time_ns(st->indio_accel); return IRQ_WAKE_THREAD; } 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"); /* FIFO threshold reached */ if (status & INV_ICM42600_INT_STATUS_FIFO_THS) { ret = inv_icm42600_buffer_fifo_read(st, 0); if (ret) { dev_err(dev, "FIFO read error %d\n", ret); goto out_unlock; } ret = inv_icm42600_buffer_fifo_parse(st); if (ret) dev_err(dev, "FIFO parsing error %d\n", ret); } 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, inv_icm42600_irq_timestamp, inv_icm42600_irq_handler, irq_type, "inv_icm42600", st); } static int inv_icm42600_enable_regulator_vddio(struct inv_icm42600_state *st) { int ret; ret = regulator_enable(st->vddio_supply); if (ret) return ret; /* wait a little for supply ramp */ usleep_range(3000, 4000); return 0; } static void inv_icm42600_disable_vdd_reg(void *_data) { struct inv_icm42600_state *st = _data; const struct device *dev = regmap_get_device(st->map); int ret; ret = regulator_disable(st->vdd_supply); if (ret) dev_err(dev, "failed to disable vdd error %d\n", ret); } static void inv_icm42600_disable_vddio_reg(void *_data) { struct inv_icm42600_state *st = _data; const struct device *dev = regmap_get_device(st->map); int ret; ret = regulator_disable(st->vddio_supply); if (ret) dev_err(dev, "failed to disable vddio error %d\n", ret); } static void inv_icm42600_disable_pm(void *_data) { struct device *dev = _data; pm_runtime_put_sync(dev); pm_runtime_disable(dev); } 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 <= INV_CHIP_INVALID || chip >= INV_CHIP_NB) { dev_err(dev, "invalid chip = %d\n", 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; dev_set_drvdata(dev, st); mutex_init(&st->lock); st->chip = chip; st->map = regmap; ret = iio_read_mount_matrix(dev, "mount-matrix", &st->orientation); if (ret) { dev_err(dev, "failed to retrieve mounting matrix %d\n", ret); return ret; } st->vdd_supply = devm_regulator_get(dev, "vdd"); if (IS_ERR(st->vdd_supply)) return PTR_ERR(st->vdd_supply); st->vddio_supply = devm_regulator_get(dev, "vddio"); if (IS_ERR(st->vddio_supply)) return PTR_ERR(st->vddio_supply); ret = regulator_enable(st->vdd_supply); if (ret) return ret; msleep(INV_ICM42600_POWER_UP_TIME_MS); ret = devm_add_action_or_reset(dev, inv_icm42600_disable_vdd_reg, st); if (ret) return ret; ret = inv_icm42600_enable_regulator_vddio(st); if (ret) return ret; ret = devm_add_action_or_reset(dev, inv_icm42600_disable_vddio_reg, st); if (ret) return ret; /* setup chip registers */ ret = inv_icm42600_setup(st, bus_setup); if (ret) return ret; ret = inv_icm42600_timestamp_setup(st); if (ret) return ret; ret = inv_icm42600_buffer_init(st); if (ret) return ret; st->indio_gyro = inv_icm42600_gyro_init(st); if (IS_ERR(st->indio_gyro)) return PTR_ERR(st->indio_gyro); st->indio_accel = inv_icm42600_accel_init(st); 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) return ret; pm_runtime_get_noresume(dev); pm_runtime_enable(dev); pm_runtime_set_autosuspend_delay(dev, INV_ICM42600_SUSPEND_DELAY_MS); pm_runtime_use_autosuspend(dev); pm_runtime_put(dev); return devm_add_action_or_reset(dev, inv_icm42600_disable_pm, dev); } EXPORT_SYMBOL_GPL(inv_icm42600_core_probe); /* * Suspend saves sensors state and turns everything off. * Check first if runtime suspend has not already done the job. */ static int __maybe_unused inv_icm42600_suspend(struct device *dev) { struct inv_icm42600_state *st = dev_get_drvdata(dev); int ret; mutex_lock(&st->lock); st->suspended.gyro = st->conf.gyro.mode; st->suspended.accel = st->conf.accel.mode; st->suspended.temp = st->conf.temp_en; if (pm_runtime_suspended(dev)) { ret = 0; goto out_unlock; } /* disable FIFO data streaming */ if (st->fifo.on) { ret = regmap_write(st->map, INV_ICM42600_REG_FIFO_CONFIG, INV_ICM42600_FIFO_CONFIG_BYPASS); if (ret) goto out_unlock; } ret = inv_icm42600_set_pwr_mgmt0(st, INV_ICM42600_SENSOR_MODE_OFF, INV_ICM42600_SENSOR_MODE_OFF, false, NULL); if (ret) goto out_unlock; regulator_disable(st->vddio_supply); out_unlock: mutex_unlock(&st->lock); return ret; } /* * System resume gets the system back on and restores the sensors state. * Manually put runtime power management in system active state. */ static int __maybe_unused inv_icm42600_resume(struct device *dev) { struct inv_icm42600_state *st = dev_get_drvdata(dev); int ret; mutex_lock(&st->lock); ret = inv_icm42600_enable_regulator_vddio(st); if (ret) goto out_unlock; pm_runtime_disable(dev); pm_runtime_set_active(dev); pm_runtime_enable(dev); /* restore sensors state */ ret = inv_icm42600_set_pwr_mgmt0(st, st->suspended.gyro, st->suspended.accel, st->suspended.temp, NULL); if (ret) goto out_unlock; /* restore FIFO data streaming */ if (st->fifo.on) ret = regmap_write(st->map, INV_ICM42600_REG_FIFO_CONFIG, INV_ICM42600_FIFO_CONFIG_STREAM); out_unlock: mutex_unlock(&st->lock); return ret; } /* Runtime suspend will turn off sensors that are enabled by iio devices. */ static int __maybe_unused inv_icm42600_runtime_suspend(struct device *dev) { struct inv_icm42600_state *st = dev_get_drvdata(dev); int ret; mutex_lock(&st->lock); /* disable all sensors */ ret = inv_icm42600_set_pwr_mgmt0(st, INV_ICM42600_SENSOR_MODE_OFF, INV_ICM42600_SENSOR_MODE_OFF, false, NULL); if (ret) goto error_unlock; regulator_disable(st->vddio_supply); error_unlock: mutex_unlock(&st->lock); return ret; } /* Sensors are enabled by iio devices, no need to turn them back on here. */ static int __maybe_unused inv_icm42600_runtime_resume(struct device *dev) { struct inv_icm42600_state *st = dev_get_drvdata(dev); int ret; mutex_lock(&st->lock); ret = inv_icm42600_enable_regulator_vddio(st); mutex_unlock(&st->lock); return ret; } const struct dev_pm_ops inv_icm42600_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS(inv_icm42600_suspend, inv_icm42600_resume) SET_RUNTIME_PM_OPS(inv_icm42600_runtime_suspend, inv_icm42600_runtime_resume, NULL) }; EXPORT_SYMBOL_GPL(inv_icm42600_pm_ops); MODULE_AUTHOR("InvenSense, Inc."); MODULE_DESCRIPTION("InvenSense ICM-426xx device driver"); MODULE_LICENSE("GPL");