diff options
Diffstat (limited to 'drivers/iio/imu/smi330/smi330_core.c')
| -rw-r--r-- | drivers/iio/imu/smi330/smi330_core.c | 918 |
1 files changed, 918 insertions, 0 deletions
diff --git a/drivers/iio/imu/smi330/smi330_core.c b/drivers/iio/imu/smi330/smi330_core.c new file mode 100644 index 000000000000..7564f12543e0 --- /dev/null +++ b/drivers/iio/imu/smi330/smi330_core.c @@ -0,0 +1,918 @@ +// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 +/* + * Copyright (c) 2025 Robert Bosch GmbH. + */ +#include <linux/bitfield.h> +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/module.h> +#include <linux/property.h> +#include <linux/regmap.h> +#include <linux/string.h> +#include <linux/units.h> + +#include <linux/iio/buffer.h> +#include <linux/iio/iio.h> +#include <linux/iio/trigger.h> +#include <linux/iio/trigger_consumer.h> +#include <linux/iio/triggered_buffer.h> + +#include "smi330.h" + +/* Register map */ +#define SMI330_CHIP_ID_REG 0x00 +#define SMI330_ERR_REG 0x01 +#define SMI330_STATUS_REG 0x02 +#define SMI330_ACCEL_X_REG 0x03 +#define SMI330_GYRO_X_REG 0x06 +#define SMI330_TEMP_REG 0x09 +#define SMI330_INT1_STATUS_REG 0x0D +#define SMI330_ACCEL_CFG_REG 0x20 +#define SMI330_GYRO_CFG_REG 0x21 +#define SMI330_IO_INT_CTRL_REG 0x38 +#define SMI330_INT_CONF_REG 0x39 +#define SMI330_INT_MAP1_REG 0x3A +#define SMI330_INT_MAP2_REG 0x3B +#define SMI330_CMD_REG 0x7E + +/* Register mask */ +#define SMI330_CHIP_ID_MASK GENMASK(7, 0) +#define SMI330_ERR_FATAL_MASK BIT(0) +#define SMI330_ERR_ACC_CONF_MASK BIT(5) +#define SMI330_ERR_GYR_CONF_MASK BIT(6) +#define SMI330_STATUS_POR_MASK BIT(0) +#define SMI330_INT_STATUS_ACC_GYR_DRDY_MASK GENMASK(13, 12) +#define SMI330_CFG_ODR_MASK GENMASK(3, 0) +#define SMI330_CFG_RANGE_MASK GENMASK(6, 4) +#define SMI330_CFG_BW_MASK BIT(7) +#define SMI330_CFG_AVG_NUM_MASK GENMASK(10, 8) +#define SMI330_CFG_MODE_MASK GENMASK(14, 12) +#define SMI330_IO_INT_CTRL_INT1_MASK GENMASK(2, 0) +#define SMI330_IO_INT_CTRL_INT2_MASK GENMASK(10, 8) +#define SMI330_INT_CONF_LATCH_MASK BIT(0) +#define SMI330_INT_MAP2_ACC_DRDY_MASK GENMASK(11, 10) +#define SMI330_INT_MAP2_GYR_DRDY_MASK GENMASK(9, 8) + +/* Register values */ +#define SMI330_IO_INT_CTRL_LVL BIT(0) +#define SMI330_IO_INT_CTRL_OD BIT(1) +#define SMI330_IO_INT_CTRL_EN BIT(2) +#define SMI330_CMD_SOFT_RESET 0xDEAF + +/* T°C = (temp / 512) + 23 */ +#define SMI330_TEMP_OFFSET 11776 /* 23 * 512 */ +#define SMI330_TEMP_SCALE 1953125 /* (1 / 512) * 1e9 */ + +#define SMI330_CHIP_ID 0x42 +#define SMI330_SOFT_RESET_DELAY 2000 + +/* Non-constant mask variant of FIELD_GET() and FIELD_PREP() */ +#define smi330_field_get(_mask, _reg) (((_reg) & (_mask)) >> (ffs(_mask) - 1)) +#define smi330_field_prep(_mask, _val) (((_val) << (ffs(_mask) - 1)) & (_mask)) + +#define SMI330_ACCEL_CHANNEL(_axis) { \ + .type = IIO_ACCEL, \ + .modified = 1, \ + .channel2 = IIO_MOD_##_axis, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_shared_by_type = \ + BIT(IIO_CHAN_INFO_SAMP_FREQ) | \ + BIT(IIO_CHAN_INFO_SCALE) | \ + BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO) | \ + BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \ + .info_mask_shared_by_type_available = \ + BIT(IIO_CHAN_INFO_SCALE) | \ + BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO) | \ + BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \ + .info_mask_shared_by_dir_available = \ + BIT(IIO_CHAN_INFO_SAMP_FREQ), \ + .scan_index = SMI330_SCAN_ACCEL_##_axis, \ + .scan_type = { \ + .sign = 's', \ + .realbits = 16, \ + .storagebits = 16, \ + .endianness = IIO_LE, \ + }, \ +} + +#define SMI330_GYRO_CHANNEL(_axis) { \ + .type = IIO_ANGL_VEL, \ + .modified = 1, \ + .channel2 = IIO_MOD_##_axis, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_shared_by_type = \ + BIT(IIO_CHAN_INFO_SAMP_FREQ) | \ + BIT(IIO_CHAN_INFO_SCALE) | \ + BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO) | \ + BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \ + .info_mask_shared_by_type_available = \ + BIT(IIO_CHAN_INFO_SCALE) | \ + BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO) | \ + BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \ + .info_mask_shared_by_dir_available = \ + BIT(IIO_CHAN_INFO_SAMP_FREQ), \ + .scan_index = SMI330_SCAN_GYRO_##_axis, \ + .scan_type = { \ + .sign = 's', \ + .realbits = 16, \ + .storagebits = 16, \ + .endianness = IIO_LE, \ + }, \ +} + +#define SMI330_TEMP_CHANNEL(_index) { \ + .type = IIO_TEMP, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ + BIT(IIO_CHAN_INFO_OFFSET) | \ + BIT(IIO_CHAN_INFO_SCALE), \ + .scan_index = _index, \ + .scan_type = { \ + .sign = 's', \ + .realbits = 16, \ + .storagebits = 16, \ + .endianness = IIO_LE, \ + }, \ +} + +enum smi330_accel_range { + SMI330_ACCEL_RANGE_2G = 0x00, + SMI330_ACCEL_RANGE_4G = 0x01, + SMI330_ACCEL_RANGE_8G = 0x02, + SMI330_ACCEL_RANGE_16G = 0x03 +}; + +enum smi330_gyro_range { + SMI330_GYRO_RANGE_125 = 0x0, + SMI330_GYRO_RANGE_250 = 0x01, + SMI330_GYRO_RANGE_500 = 0x02 +}; + +enum smi330_odr { + SMI330_ODR_12_5_HZ = 0x05, + SMI330_ODR_25_HZ = 0x06, + SMI330_ODR_50_HZ = 0x07, + SMI330_ODR_100_HZ = 0x08, + SMI330_ODR_200_HZ = 0x09, + SMI330_ODR_400_HZ = 0x0A, + SMI330_ODR_800_HZ = 0x0B, + SMI330_ODR_1600_HZ = 0x0C, + SMI330_ODR_3200_HZ = 0x0D, + SMI330_ODR_6400_HZ = 0x0E +}; + +enum smi330_avg_num { + SMI330_AVG_NUM_1 = 0x00, + SMI330_AVG_NUM_2 = 0x01, + SMI330_AVG_NUM_4 = 0x02, + SMI330_AVG_NUM_8 = 0x03, + SMI330_AVG_NUM_16 = 0x04, + SMI330_AVG_NUM_32 = 0x05, + SMI330_AVG_NUM_64 = 0x06 +}; + +enum smi330_mode { + SMI330_MODE_SUSPEND = 0x00, + SMI330_MODE_GYRO_DRIVE = 0x01, + SMI330_MODE_LOW_POWER = 0x03, + SMI330_MODE_NORMAL = 0x04, + SMI330_MODE_HIGH_PERF = 0x07 +}; + +enum smi330_bw { + SMI330_BW_2 = 0x00, /* ODR/2 */ + SMI330_BW_4 = 0x01 /* ODR/4 */ +}; + +enum smi330_operation_mode { + SMI330_POLLING, + SMI330_DATA_READY, +}; + +enum smi330_sensor { + SMI330_ACCEL, + SMI330_GYRO, +}; + +enum smi330_sensor_conf_select { + SMI330_ODR, + SMI330_RANGE, + SMI330_BW, + SMI330_AVG_NUM, +}; + +enum smi330_int_out { + SMI330_INT_DISABLED, + SMI330_INT_1, + SMI330_INT_2, +}; + +struct smi330_attributes { + int *reg_vals; + int *vals; + int len; + int type; + int mask; +}; + +struct smi330_cfg { + enum smi330_operation_mode op_mode; + enum smi330_int_out data_irq; +}; + +struct smi330_data { + struct regmap *regmap; + struct smi330_cfg cfg; + struct iio_trigger *trig; + IIO_DECLARE_BUFFER_WITH_TS(__le16, buf, SMI330_SCAN_LEN); +}; + +const struct regmap_config smi330_regmap_config = { + .reg_bits = 8, + .val_bits = 16, + .val_format_endian = REGMAP_ENDIAN_LITTLE, +}; +EXPORT_SYMBOL_NS_GPL(smi330_regmap_config, "IIO_SMI330"); + +static const struct iio_chan_spec smi330_channels[] = { + SMI330_ACCEL_CHANNEL(X), + SMI330_ACCEL_CHANNEL(Y), + SMI330_ACCEL_CHANNEL(Z), + SMI330_GYRO_CHANNEL(X), + SMI330_GYRO_CHANNEL(Y), + SMI330_GYRO_CHANNEL(Z), + SMI330_TEMP_CHANNEL(-1), /* No buffer support */ + IIO_CHAN_SOFT_TIMESTAMP(SMI330_SCAN_TIMESTAMP), +}; + +static const unsigned long smi330_avail_scan_masks[] = { + (BIT(SMI330_SCAN_ACCEL_X) | BIT(SMI330_SCAN_ACCEL_Y) | + BIT(SMI330_SCAN_ACCEL_Z) | BIT(SMI330_SCAN_GYRO_X) | + BIT(SMI330_SCAN_GYRO_Y) | BIT(SMI330_SCAN_GYRO_Z)), + 0 +}; + +static const struct smi330_attributes smi330_accel_scale_attr = { + .reg_vals = (int[]){ SMI330_ACCEL_RANGE_2G, SMI330_ACCEL_RANGE_4G, + SMI330_ACCEL_RANGE_8G, SMI330_ACCEL_RANGE_16G }, + .vals = (int[]){ 0, 61035, 0, 122070, 0, 244140, 0, 488281 }, + .len = 8, + .type = IIO_VAL_INT_PLUS_NANO, + .mask = SMI330_CFG_RANGE_MASK +}; + +static const struct smi330_attributes smi330_gyro_scale_attr = { + .reg_vals = (int[]){ SMI330_GYRO_RANGE_125, SMI330_GYRO_RANGE_250, + SMI330_GYRO_RANGE_500 }, + .vals = (int[]){ 0, 3814697, 0, 7629395, 0, 15258789 }, + .len = 6, + .type = IIO_VAL_INT_PLUS_NANO, + .mask = SMI330_CFG_RANGE_MASK +}; + +static const struct smi330_attributes smi330_average_attr = { + .reg_vals = (int[]){ SMI330_AVG_NUM_1, SMI330_AVG_NUM_2, + SMI330_AVG_NUM_4, SMI330_AVG_NUM_8, + SMI330_AVG_NUM_16, SMI330_AVG_NUM_32, + SMI330_AVG_NUM_64 }, + .vals = (int[]){ 1, 2, 4, 8, 16, 32, 64 }, + .len = 7, + .type = IIO_VAL_INT, + .mask = SMI330_CFG_AVG_NUM_MASK +}; + +static const struct smi330_attributes smi330_bandwidth_attr = { + .reg_vals = (int[]){ SMI330_BW_2, SMI330_BW_4 }, + .vals = (int[]){ 2, 4 }, + .len = 2, + .type = IIO_VAL_INT, + .mask = SMI330_CFG_BW_MASK +}; + +static const struct smi330_attributes smi330_odr_attr = { + .reg_vals = (int[]){ SMI330_ODR_12_5_HZ, SMI330_ODR_25_HZ, + SMI330_ODR_50_HZ, SMI330_ODR_100_HZ, + SMI330_ODR_200_HZ, SMI330_ODR_400_HZ, + SMI330_ODR_800_HZ, SMI330_ODR_1600_HZ, + SMI330_ODR_3200_HZ, SMI330_ODR_6400_HZ }, + .vals = (int[]){ 12, 25, 50, 100, 200, 400, 800, 1600, 3200, 6400 }, + .len = 10, + .type = IIO_VAL_INT, + .mask = SMI330_CFG_ODR_MASK +}; + +static int smi330_get_attributes(enum smi330_sensor_conf_select config, + enum smi330_sensor sensor, + const struct smi330_attributes **attr) +{ + switch (config) { + case SMI330_ODR: + *attr = &smi330_odr_attr; + return 0; + case SMI330_RANGE: + if (sensor == SMI330_ACCEL) + *attr = &smi330_accel_scale_attr; + else + *attr = &smi330_gyro_scale_attr; + return 0; + case SMI330_BW: + *attr = &smi330_bandwidth_attr; + return 0; + case SMI330_AVG_NUM: + *attr = &smi330_average_attr; + return 0; + default: + return -EINVAL; + } +} + +static int smi330_get_config_reg(enum smi330_sensor sensor, int *reg) +{ + switch (sensor) { + case SMI330_ACCEL: + *reg = SMI330_ACCEL_CFG_REG; + return 0; + case SMI330_GYRO: + *reg = SMI330_GYRO_CFG_REG; + return 0; + default: + return -EINVAL; + } +} + +static int smi330_get_sensor_config(struct smi330_data *data, + enum smi330_sensor sensor, + enum smi330_sensor_conf_select config, + int *value) + +{ + int ret, reg, reg_val, i; + const struct smi330_attributes *attr; + + ret = smi330_get_config_reg(sensor, ®); + if (ret) + return ret; + + ret = regmap_read(data->regmap, reg, ®_val); + if (ret) + return ret; + + ret = smi330_get_attributes(config, sensor, &attr); + if (ret) + return ret; + + reg_val = smi330_field_get(attr->mask, reg_val); + + if (attr->type == IIO_VAL_INT) { + for (i = 0; i < attr->len; i++) { + if (attr->reg_vals[i] == reg_val) { + *value = attr->vals[i]; + return 0; + } + } + } else { + for (i = 0; i < attr->len / 2; i++) { + if (attr->reg_vals[i] == reg_val) { + *value = attr->vals[2 * i + 1]; + return 0; + } + } + } + + return -EINVAL; +} + +static int smi330_set_sensor_config(struct smi330_data *data, + enum smi330_sensor sensor, + enum smi330_sensor_conf_select config, + int value) +{ + int ret, i, reg, reg_val, error; + const struct smi330_attributes *attr; + + ret = smi330_get_attributes(config, sensor, &attr); + if (ret) + return ret; + + for (i = 0; i < attr->len; i++) { + if (attr->vals[i] == value) { + if (attr->type == IIO_VAL_INT) + reg_val = attr->reg_vals[i]; + else + reg_val = attr->reg_vals[i / 2]; + break; + } + } + if (i == attr->len) + return -EINVAL; + + ret = smi330_get_config_reg(sensor, ®); + if (ret) + return ret; + + reg_val = smi330_field_prep(attr->mask, reg_val); + ret = regmap_update_bits(data->regmap, reg, attr->mask, reg_val); + if (ret) + return ret; + + ret = regmap_read(data->regmap, SMI330_ERR_REG, &error); + if (ret) + return ret; + + if (FIELD_GET(SMI330_ERR_ACC_CONF_MASK, error) || + FIELD_GET(SMI330_ERR_GYR_CONF_MASK, error)) + return -EIO; + + return 0; +} + +static int smi330_get_data(struct smi330_data *data, int chan_type, int axis, + int *val) +{ + u8 reg; + int ret, sample; + + switch (chan_type) { + case IIO_ACCEL: + reg = SMI330_ACCEL_X_REG + (axis - IIO_MOD_X); + break; + case IIO_ANGL_VEL: + reg = SMI330_GYRO_X_REG + (axis - IIO_MOD_X); + break; + case IIO_TEMP: + reg = SMI330_TEMP_REG; + break; + default: + return -EINVAL; + } + + ret = regmap_read(data->regmap, reg, &sample); + if (ret) + return ret; + + *val = sign_extend32(sample, 15); + + return 0; +} + +static int smi330_read_avail(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, const int **vals, + int *type, int *length, long mask) +{ + switch (mask) { + case IIO_CHAN_INFO_SCALE: + if (chan->type == IIO_ACCEL) { + *vals = smi330_accel_scale_attr.vals; + *length = smi330_accel_scale_attr.len; + *type = smi330_accel_scale_attr.type; + } else { + *vals = smi330_gyro_scale_attr.vals; + *length = smi330_gyro_scale_attr.len; + *type = smi330_gyro_scale_attr.type; + } + return IIO_AVAIL_LIST; + case IIO_CHAN_INFO_OVERSAMPLING_RATIO: + *vals = smi330_average_attr.vals; + *length = smi330_average_attr.len; + *type = smi330_average_attr.type; + *type = IIO_VAL_INT; + return IIO_AVAIL_LIST; + case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: + *vals = smi330_bandwidth_attr.vals; + *length = smi330_bandwidth_attr.len; + *type = smi330_bandwidth_attr.type; + return IIO_AVAIL_LIST; + case IIO_CHAN_INFO_SAMP_FREQ: + *vals = smi330_odr_attr.vals; + *length = smi330_odr_attr.len; + *type = smi330_odr_attr.type; + return IIO_AVAIL_LIST; + default: + return -EINVAL; + } +} + +static int smi330_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int *val, + int *val2, long mask) +{ + int ret; + struct smi330_data *data = iio_priv(indio_dev); + enum smi330_sensor sensor; + + /* valid for all channel types */ + switch (mask) { + case IIO_CHAN_INFO_RAW: + if (!iio_device_claim_direct(indio_dev)) + return -EBUSY; + ret = smi330_get_data(data, chan->type, chan->channel2, val); + iio_device_release_direct(indio_dev); + return ret ? ret : IIO_VAL_INT; + default: + break; + } + + switch (chan->type) { + case IIO_ACCEL: + sensor = SMI330_ACCEL; + break; + case IIO_ANGL_VEL: + sensor = SMI330_GYRO; + break; + case IIO_TEMP: + switch (mask) { + case IIO_CHAN_INFO_SCALE: + *val = SMI330_TEMP_SCALE / GIGA; + *val2 = SMI330_TEMP_SCALE % GIGA; + return IIO_VAL_INT_PLUS_NANO; + case IIO_CHAN_INFO_OFFSET: + *val = SMI330_TEMP_OFFSET; + return IIO_VAL_INT; + default: + return -EINVAL; + } + default: + return -EINVAL; + } + + /* valid for acc and gyro channels */ + switch (mask) { + case IIO_CHAN_INFO_OVERSAMPLING_RATIO: + ret = smi330_get_sensor_config(data, sensor, SMI330_AVG_NUM, + val); + return ret ? ret : IIO_VAL_INT; + + case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: + ret = smi330_get_sensor_config(data, sensor, SMI330_BW, val); + return ret ? ret : IIO_VAL_INT; + + case IIO_CHAN_INFO_SAMP_FREQ: + ret = smi330_get_sensor_config(data, sensor, SMI330_ODR, val); + return ret ? ret : IIO_VAL_INT; + + case IIO_CHAN_INFO_SCALE: + *val = 0; + ret = smi330_get_sensor_config(data, sensor, SMI330_RANGE, + val2); + return ret ? ret : IIO_VAL_INT_PLUS_NANO; + + default: + return -EINVAL; + } +} + +static int smi330_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int val, int val2, + long mask) +{ + struct smi330_data *data = iio_priv(indio_dev); + enum smi330_sensor sensor; + + switch (chan->type) { + case IIO_ACCEL: + sensor = SMI330_ACCEL; + break; + case IIO_ANGL_VEL: + sensor = SMI330_GYRO; + break; + default: + return -EINVAL; + } + + switch (mask) { + case IIO_CHAN_INFO_SCALE: + return smi330_set_sensor_config(data, sensor, SMI330_RANGE, + val2); + case IIO_CHAN_INFO_OVERSAMPLING_RATIO: + return smi330_set_sensor_config(data, sensor, SMI330_AVG_NUM, + val); + case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: + return smi330_set_sensor_config(data, sensor, SMI330_BW, val); + case IIO_CHAN_INFO_SAMP_FREQ: + return smi330_set_sensor_config(data, sensor, SMI330_ODR, val); + default: + return -EINVAL; + } +} + +static int smi330_write_raw_get_fmt(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, long info) +{ + switch (info) { + case IIO_CHAN_INFO_SCALE: + return IIO_VAL_INT_PLUS_NANO; + default: + return IIO_VAL_INT_PLUS_MICRO; + } +} + +static int smi330_soft_reset(struct smi330_data *data) +{ + int ret, dummy_byte; + + ret = regmap_write(data->regmap, SMI330_CMD_REG, SMI330_CMD_SOFT_RESET); + if (ret) + return ret; + fsleep(SMI330_SOFT_RESET_DELAY); + + /* Performing a dummy read after a soft-reset */ + regmap_read(data->regmap, SMI330_CHIP_ID_REG, &dummy_byte); + + return 0; +} + +static irqreturn_t smi330_trigger_handler(int irq, void *p) +{ + int ret; + struct iio_poll_func *pf = p; + struct iio_dev *indio_dev = pf->indio_dev; + struct smi330_data *data = iio_priv(indio_dev); + + ret = regmap_bulk_read(data->regmap, SMI330_ACCEL_X_REG, data->buf, + SMI330_SCAN_LEN); + if (ret) + goto out; + + iio_push_to_buffers_with_timestamp(indio_dev, data->buf, pf->timestamp); + +out: + iio_trigger_notify_done(indio_dev->trig); + + return IRQ_HANDLED; +} + +static irqreturn_t smi330_irq_thread_handler(int irq, void *indio_dev_) +{ + int ret, int_stat; + s16 int_status[2] = { 0 }; + struct iio_dev *indio_dev = indio_dev_; + struct smi330_data *data = iio_priv(indio_dev); + + ret = regmap_bulk_read(data->regmap, SMI330_INT1_STATUS_REG, int_status, 2); + if (ret) + return IRQ_NONE; + + int_stat = int_status[0] | int_status[1]; + + if (FIELD_GET(SMI330_INT_STATUS_ACC_GYR_DRDY_MASK, int_stat)) { + indio_dev->pollfunc->timestamp = iio_get_time_ns(indio_dev); + iio_trigger_poll_nested(data->trig); + } + + return IRQ_HANDLED; +} + +static int smi330_set_int_pin_config(struct smi330_data *data, + enum smi330_int_out irq_num, + bool active_high, bool open_drain, + bool latch) +{ + int ret, val; + + val = active_high ? SMI330_IO_INT_CTRL_LVL : 0; + val |= open_drain ? SMI330_IO_INT_CTRL_OD : 0; + val |= SMI330_IO_INT_CTRL_EN; + + switch (irq_num) { + case SMI330_INT_1: + val = FIELD_PREP(SMI330_IO_INT_CTRL_INT1_MASK, val); + ret = regmap_update_bits(data->regmap, SMI330_IO_INT_CTRL_REG, + SMI330_IO_INT_CTRL_INT1_MASK, val); + if (ret) + return ret; + break; + case SMI330_INT_2: + val = FIELD_PREP(SMI330_IO_INT_CTRL_INT2_MASK, val); + ret = regmap_update_bits(data->regmap, SMI330_IO_INT_CTRL_REG, + SMI330_IO_INT_CTRL_INT2_MASK, val); + if (ret) + return ret; + break; + default: + return -EINVAL; + } + + return regmap_update_bits(data->regmap, SMI330_INT_CONF_REG, + SMI330_INT_CONF_LATCH_MASK, + FIELD_PREP(SMI330_INT_CONF_LATCH_MASK, + latch)); +} + +static int smi330_setup_irq(struct device *dev, struct iio_dev *indio_dev, + int irq, enum smi330_int_out irq_num) +{ + int ret, irq_type; + bool open_drain, active_high, latch; + struct smi330_data *data = iio_priv(indio_dev); + struct irq_data *desc; + + desc = irq_get_irq_data(irq); + if (!desc) + return -EINVAL; + + irq_type = irqd_get_trigger_type(desc); + switch (irq_type) { + case IRQF_TRIGGER_RISING: + latch = false; + active_high = true; + break; + case IRQF_TRIGGER_HIGH: + latch = true; + active_high = true; + break; + case IRQF_TRIGGER_FALLING: + latch = false; + active_high = false; + break; + case IRQF_TRIGGER_LOW: + latch = true; + active_high = false; + break; + default: + return -EINVAL; + } + + open_drain = device_property_read_bool(dev, "drive-open-drain"); + + ret = smi330_set_int_pin_config(data, irq_num, active_high, open_drain, + latch); + if (ret) + return ret; + + return devm_request_threaded_irq(dev, irq, NULL, + smi330_irq_thread_handler, + irq_type | IRQF_ONESHOT, + indio_dev->name, indio_dev); +} + +static int smi330_register_irq(struct device *dev, struct iio_dev *indio_dev) +{ + int ret, irq; + struct smi330_data *data = iio_priv(indio_dev); + struct fwnode_handle *fwnode; + + fwnode = dev_fwnode(dev); + if (!fwnode) + return -ENODEV; + + data->cfg.data_irq = SMI330_INT_DISABLED; + + irq = fwnode_irq_get_byname(fwnode, "INT1"); + if (irq > 0) { + ret = smi330_setup_irq(dev, indio_dev, irq, SMI330_INT_1); + if (ret) + return ret; + data->cfg.data_irq = SMI330_INT_1; + } else { + irq = fwnode_irq_get_byname(fwnode, "INT2"); + if (irq > 0) { + ret = smi330_setup_irq(dev, indio_dev, irq, + SMI330_INT_2); + if (ret) + return ret; + data->cfg.data_irq = SMI330_INT_2; + } + } + + return 0; +} + +static int smi330_set_drdy_trigger_state(struct iio_trigger *trig, bool enable) +{ + int val; + struct smi330_data *data = iio_trigger_get_drvdata(trig); + + if (enable) + data->cfg.op_mode = SMI330_DATA_READY; + else + data->cfg.op_mode = SMI330_POLLING; + + val = FIELD_PREP(SMI330_INT_MAP2_ACC_DRDY_MASK, + enable ? data->cfg.data_irq : 0); + val |= FIELD_PREP(SMI330_INT_MAP2_GYR_DRDY_MASK, + enable ? data->cfg.data_irq : 0); + return regmap_update_bits(data->regmap, SMI330_INT_MAP2_REG, + SMI330_INT_MAP2_ACC_DRDY_MASK | + SMI330_INT_MAP2_GYR_DRDY_MASK, + val); +} + +static const struct iio_trigger_ops smi330_trigger_ops = { + .set_trigger_state = &smi330_set_drdy_trigger_state, +}; + +static struct iio_info smi330_info = { + .read_avail = smi330_read_avail, + .read_raw = smi330_read_raw, + .write_raw = smi330_write_raw, + .write_raw_get_fmt = smi330_write_raw_get_fmt, +}; + +static int smi330_dev_init(struct smi330_data *data) +{ + int ret, chip_id, val, mode; + struct device *dev = regmap_get_device(data->regmap); + + ret = regmap_read(data->regmap, SMI330_CHIP_ID_REG, &chip_id); + if (ret) + return ret; + + chip_id = FIELD_GET(SMI330_CHIP_ID_MASK, chip_id); + if (chip_id != SMI330_CHIP_ID) + dev_info(dev, "Unknown chip id: 0x%04x\n", chip_id); + + ret = regmap_read(data->regmap, SMI330_ERR_REG, &val); + if (ret) + return ret; + if (FIELD_GET(SMI330_ERR_FATAL_MASK, val)) + return -ENODEV; + + ret = regmap_read(data->regmap, SMI330_STATUS_REG, &val); + if (ret) + return ret; + if (FIELD_GET(SMI330_STATUS_POR_MASK, val) == 0) + return -ENODEV; + + mode = FIELD_PREP(SMI330_CFG_MODE_MASK, SMI330_MODE_NORMAL); + + ret = regmap_update_bits(data->regmap, SMI330_ACCEL_CFG_REG, + SMI330_CFG_MODE_MASK, mode); + if (ret) + return ret; + + return regmap_update_bits(data->regmap, SMI330_GYRO_CFG_REG, + SMI330_CFG_MODE_MASK, mode); +} + +int smi330_core_probe(struct device *dev, struct regmap *regmap) +{ + int ret; + struct iio_dev *indio_dev; + struct smi330_data *data; + + indio_dev = devm_iio_device_alloc(dev, sizeof(*data)); + if (!indio_dev) + return -ENOMEM; + + data = iio_priv(indio_dev); + data->regmap = regmap; + + ret = smi330_soft_reset(data); + if (ret) + return dev_err_probe(dev, ret, "Soft reset failed\n"); + + indio_dev->channels = smi330_channels; + indio_dev->num_channels = ARRAY_SIZE(smi330_channels); + indio_dev->available_scan_masks = smi330_avail_scan_masks; + indio_dev->name = "smi330"; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->info = &smi330_info; + + data->cfg.op_mode = SMI330_POLLING; + + ret = smi330_dev_init(data); + if (ret) + return dev_err_probe(dev, ret, "Init failed\n"); + + ret = smi330_register_irq(dev, indio_dev); + if (ret) + return dev_err_probe(dev, ret, "Register IRQ failed\n"); + + if (data->cfg.data_irq != SMI330_INT_DISABLED) { + data->trig = devm_iio_trigger_alloc(dev, "%s-drdy-trigger", + indio_dev->name); + if (!data->trig) + return -ENOMEM; + + data->trig->ops = &smi330_trigger_ops; + iio_trigger_set_drvdata(data->trig, data); + + ret = devm_iio_trigger_register(dev, data->trig); + if (ret) + return dev_err_probe(dev, ret, + "IIO register trigger failed\n"); + + /* Set default operation mode to data ready. */ + indio_dev->trig = iio_trigger_get(data->trig); + } + + ret = devm_iio_triggered_buffer_setup(dev, indio_dev, + iio_pollfunc_store_time, + smi330_trigger_handler, NULL); + if (ret) + return dev_err_probe(dev, ret, "IIO buffer setup failed\n"); + + ret = devm_iio_device_register(dev, indio_dev); + if (ret) + return dev_err_probe(dev, ret, "Register IIO device failed\n"); + + return 0; +} +EXPORT_SYMBOL_NS_GPL(smi330_core_probe, "IIO_SMI330"); + +MODULE_AUTHOR("Stefan Gutmann <stefan.gutmann@de.bosch.com>"); +MODULE_AUTHOR("Roman Huber <roman.huber@de.bosch.com>"); +MODULE_AUTHOR("Filip Andrei <Andrei.Filip@ro.bosch.com>"); +MODULE_AUTHOR("Drimbarean Avram Andrei <Avram-Andrei.Drimbarean@ro.bosch.com>"); +MODULE_DESCRIPTION("Bosch SMI330 IMU driver"); +MODULE_LICENSE("Dual BSD/GPL"); |