| Message ID | 20210426081041.59807-3-tomas.melin@vaisala.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | iio: accel: sca3300: Accelerometer support and binding doc | expand |
On Mon, Apr 26, 2021 at 11:11 AM Tomas Melin <tomas.melin@vaisala.com> wrote: > > Add initial support for Murata SCA3300 3-axis industrial > accelerometer with digital SPI interface. This device also > provides a temperature measurement. Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> > Datasheet: https://www.murata.com/en-global/products/sensor/accel/sca3300 > Signed-off-by: Tomas Melin <tomas.melin@vaisala.com> > --- > drivers/iio/accel/Kconfig | 13 + > drivers/iio/accel/Makefile | 1 + > drivers/iio/accel/sca3300.c | 472 ++++++++++++++++++++++++++++++++++++ > 3 files changed, 486 insertions(+) > create mode 100644 drivers/iio/accel/sca3300.c > > diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig > index cceda3cecbcf..0dbf7b648e8a 100644 > --- a/drivers/iio/accel/Kconfig > +++ b/drivers/iio/accel/Kconfig > @@ -450,6 +450,19 @@ config SCA3000 > To compile this driver as a module, say M here: the module will be > called sca3000. > > +config SCA3300 > + tristate "Murata SCA3300 3-Axis Accelerometer Driver" > + depends on SPI > + select CRC8 > + select IIO_BUFFER > + select IIO_TRIGGERED_BUFFER > + help > + Say yes here to build support for Murata SCA3300 3-Axis > + accelerometer. > + > + To compile this driver as a module, choose M here: the module will be > + called sca3300. > + > config STK8312 > tristate "Sensortek STK8312 3-Axis Accelerometer Driver" > depends on I2C > diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile > index 32cd1342a31a..4b56527a2b97 100644 > --- a/drivers/iio/accel/Makefile > +++ b/drivers/iio/accel/Makefile > @@ -50,6 +50,7 @@ obj-$(CONFIG_MXC4005) += mxc4005.o > obj-$(CONFIG_MXC6255) += mxc6255.o > > obj-$(CONFIG_SCA3000) += sca3000.o > +obj-$(CONFIG_SCA3300) += sca3300.o > > obj-$(CONFIG_STK8312) += stk8312.o > obj-$(CONFIG_STK8BA50) += stk8ba50.o > diff --git a/drivers/iio/accel/sca3300.c b/drivers/iio/accel/sca3300.c > new file mode 100644 > index 000000000000..f7ef8ecfd34a > --- /dev/null > +++ b/drivers/iio/accel/sca3300.c > @@ -0,0 +1,472 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +/* > + * Murata SCA3300 3-axis industrial accelerometer > + * > + * Copyright (c) 2021 Vaisala Oyj. All rights reserved. > + */ > + > +#include <linux/bitops.h> > +#include <linux/crc8.h> > +#include <linux/delay.h> > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/spi/spi.h> > + > +#include <asm/unaligned.h> > + > +#include <linux/iio/buffer.h> > +#include <linux/iio/iio.h> > +#include <linux/iio/sysfs.h> > +#include <linux/iio/trigger_consumer.h> > +#include <linux/iio/triggered_buffer.h> > + > +#define SCA3300_ALIAS "sca3300" > + > +#define SCA3300_CRC8_POLYNOMIAL 0x1d > + > +/* Device mode register */ > +#define SCA3300_REG_MODE 0xd > +#define SCA3300_MODE_SW_RESET 0x20 > + > +/* Last register in map */ > +#define SCA3300_REG_SELBANK 0x1f > + > +/* Device status and mask */ > +#define SCA3300_REG_STATUS 0x6 > +#define SCA3300_STATUS_MASK GENMASK(8, 0) > + > +/* Device ID */ > +#define SCA3300_REG_WHOAMI 0x10 > +#define SCA3300_WHOAMI_ID 0x51 > + > +/* Device return status and mask */ > +#define SCA3300_VALUE_RS_ERROR 0x3 > +#define SCA3300_MASK_RS_STATUS GENMASK(1, 0) > + > +enum sca3300_scan_indexes { > + SCA3300_ACC_X = 0, > + SCA3300_ACC_Y, > + SCA3300_ACC_Z, > + SCA3300_TEMP, > + SCA3300_TIMESTAMP, > +}; > + > +#define SCA3300_ACCEL_CHANNEL(index, reg, axis) { \ > + .type = IIO_ACCEL, \ > + .address = reg, \ > + .modified = 1, \ > + .channel2 = IIO_MOD_##axis, \ > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ > + .info_mask_shared_by_type = \ > + BIT(IIO_CHAN_INFO_SCALE) | \ > + BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \ > + .info_mask_shared_by_type_available = \ > + BIT(IIO_CHAN_INFO_SCALE) | \ > + BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \ > + .scan_index = index, \ > + .scan_type = { \ > + .sign = 's', \ > + .realbits = 16, \ > + .storagebits = 16, \ > + .endianness = IIO_CPU, \ > + }, \ > +} > + > +static const struct iio_chan_spec sca3300_channels[] = { > + SCA3300_ACCEL_CHANNEL(SCA3300_ACC_X, 0x1, X), > + SCA3300_ACCEL_CHANNEL(SCA3300_ACC_Y, 0x2, Y), > + SCA3300_ACCEL_CHANNEL(SCA3300_ACC_Z, 0x3, Z), > + { > + .type = IIO_TEMP, > + .address = 0x5, > + .scan_index = SCA3300_TEMP, > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), > + .scan_type = { > + .sign = 's', > + .realbits = 16, > + .storagebits = 16, > + .endianness = IIO_CPU, > + }, > + }, > + IIO_CHAN_SOFT_TIMESTAMP(4), > +}; > + > +static const int sca3300_lp_freq[] = {70, 70, 70, 10}; > +static const int sca3300_accel_scale[][2] = {{0, 370}, {0, 741}, {0, 185}, {0, 185}}; > + > +static const unsigned long sca3300_scan_masks[] = { > + BIT(SCA3300_ACC_X) | BIT(SCA3300_ACC_Y) | BIT(SCA3300_ACC_Z) | > + BIT(SCA3300_TEMP), > + 0 > +}; > + > +/** > + * struct sca3300_data - device data > + * @spi: SPI device structure > + * @lock: Data buffer lock > + * @scan: Triggered buffer. Four channel 16-bit data + 64-bit timestamp > + * @txbuf: Transmit buffer > + * @rxbuf: Receive buffer > + */ > +struct sca3300_data { > + struct spi_device *spi; > + struct mutex lock; > + struct { > + s16 channels[4]; > + s64 ts __aligned(sizeof(s64)); > + } scan; > + u8 txbuf[4] ____cacheline_aligned; > + u8 rxbuf[4]; > +}; > + > +DECLARE_CRC8_TABLE(sca3300_crc_table); > + > +static int sca3300_transfer(struct sca3300_data *sca_data, int *val) > +{ > + /* Consecutive requests min. 10 us delay (Datasheet section 5.1.2) */ > + struct spi_delay delay = { .value = 10, .unit = SPI_DELAY_UNIT_USECS }; > + int32_t ret; > + int rs; > + u8 crc; > + struct spi_transfer xfers[2] = { > + { > + .tx_buf = sca_data->txbuf, > + .len = ARRAY_SIZE(sca_data->txbuf), > + .delay = delay, > + .cs_change = 1, > + }, > + { > + .rx_buf = sca_data->rxbuf, > + .len = ARRAY_SIZE(sca_data->rxbuf), > + .delay = delay, > + } > + }; > + > + /* inverted crc value as described in device data sheet */ > + crc = ~crc8(sca3300_crc_table, &sca_data->txbuf[0], 3, CRC8_INIT_VALUE); > + sca_data->txbuf[3] = crc; > + > + ret = spi_sync_transfer(sca_data->spi, xfers, ARRAY_SIZE(xfers)); > + if (ret) { > + dev_err(&sca_data->spi->dev, > + "transfer error, error: %d\n", ret); > + return -EIO; > + } > + > + crc = ~crc8(sca3300_crc_table, &sca_data->rxbuf[0], 3, CRC8_INIT_VALUE); > + if (sca_data->rxbuf[3] != crc) { > + dev_err(&sca_data->spi->dev, "CRC checksum mismatch"); > + return -EIO; > + } > + > + /* get return status */ > + rs = sca_data->rxbuf[0] & SCA3300_MASK_RS_STATUS; > + if (rs == SCA3300_VALUE_RS_ERROR) > + ret = -EINVAL; > + > + *val = sign_extend32(get_unaligned_be16(&sca_data->rxbuf[1]), 15); > + > + return ret; > +} > + > +static int sca3300_error_handler(struct sca3300_data *sca_data) > +{ > + int ret; > + int val; > + > + mutex_lock(&sca_data->lock); > + sca_data->txbuf[0] = SCA3300_REG_STATUS << 2; > + ret = sca3300_transfer(sca_data, &val); > + mutex_unlock(&sca_data->lock); > + /* > + * Return status error is cleared after reading status register once, > + * expect EINVAL here. > + */ > + if (ret != -EINVAL) { > + dev_err(&sca_data->spi->dev, > + "error reading device status: %d\n", ret); > + return ret; > + } > + > + dev_err(&sca_data->spi->dev, "device status: 0x%lx\n", > + val & SCA3300_STATUS_MASK); > + > + return 0; > +} > + > +static int sca3300_read_reg(struct sca3300_data *sca_data, u8 reg, int *val) > +{ > + int ret; > + > + mutex_lock(&sca_data->lock); > + sca_data->txbuf[0] = reg << 2; > + ret = sca3300_transfer(sca_data, val); > + mutex_unlock(&sca_data->lock); > + if (ret != -EINVAL) > + return ret; > + > + return sca3300_error_handler(sca_data); > +} > + > +static int sca3300_write_reg(struct sca3300_data *sca_data, u8 reg, int val) > +{ > + int reg_val = 0; > + int ret; > + > + mutex_lock(&sca_data->lock); > + /* BIT(7) for write operation */ > + sca_data->txbuf[0] = BIT(7) | (reg << 2); > + put_unaligned_be16(val, &sca_data->txbuf[1]); > + ret = sca3300_transfer(sca_data, ®_val); > + mutex_unlock(&sca_data->lock); > + if (ret != -EINVAL) > + return ret; > + > + return sca3300_error_handler(sca_data); > +} > + > +static int sca3300_write_raw(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, > + int val, int val2, long mask) > +{ > + struct sca3300_data *data = iio_priv(indio_dev); > + int reg_val; > + int ret; > + int i; > + > + switch (mask) { > + case IIO_CHAN_INFO_SCALE: > + if (val) > + return -EINVAL; > + > + for (i = 0; i < ARRAY_SIZE(sca3300_accel_scale); i++) { > + if (val2 == sca3300_accel_scale[i][1]) > + return sca3300_write_reg(data, SCA3300_REG_MODE, i); > + } > + return -EINVAL; > + > + case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: > + ret = sca3300_read_reg(data, SCA3300_REG_MODE, ®_val); > + if (ret) > + return ret; > + /* freq. change is possible only for mode 3 and 4 */ > + if (reg_val == 2 && val == sca3300_lp_freq[3]) > + return sca3300_write_reg(data, SCA3300_REG_MODE, 3); > + if (reg_val == 3 && val == sca3300_lp_freq[2]) > + return sca3300_write_reg(data, SCA3300_REG_MODE, 2); > + return -EINVAL; > + default: > + return -EINVAL; > + } > +} > + > +static int sca3300_read_raw(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, > + int *val, int *val2, long mask) > +{ > + struct sca3300_data *data = iio_priv(indio_dev); > + int ret; > + int reg_val; > + > + switch (mask) { > + case IIO_CHAN_INFO_RAW: > + ret = sca3300_read_reg(data, chan->address, val); > + if (ret) > + return ret; > + return IIO_VAL_INT; > + case IIO_CHAN_INFO_SCALE: > + ret = sca3300_read_reg(data, SCA3300_REG_MODE, ®_val); > + if (ret) > + return ret; > + *val = 0; > + *val2 = sca3300_accel_scale[reg_val][1]; > + return IIO_VAL_INT_PLUS_MICRO; > + case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: > + ret = sca3300_read_reg(data, SCA3300_REG_MODE, ®_val); > + if (ret) > + return ret; > + *val = sca3300_lp_freq[reg_val]; > + return IIO_VAL_INT; > + default: > + return -EINVAL; > + } > +} > + > +static irqreturn_t sca3300_trigger_handler(int irq, void *p) > +{ > + struct iio_poll_func *pf = p; > + struct iio_dev *indio_dev = pf->indio_dev; > + struct sca3300_data *data = iio_priv(indio_dev); > + int bit, ret, val, i = 0; > + > + for_each_set_bit(bit, indio_dev->active_scan_mask, > + indio_dev->masklength) { > + ret = sca3300_read_reg(data, sca3300_channels[bit].address, > + &val); > + if (ret) { > + dev_err_ratelimited(&data->spi->dev, > + "failed to read register, error: %d\n", ret); > + /* handled, but bailing out due to errors */ > + goto out; > + } > + data->scan.channels[i++] = val; > + } > + > + iio_push_to_buffers_with_timestamp(indio_dev, &data->scan, > + iio_get_time_ns(indio_dev)); > +out: > + iio_trigger_notify_done(indio_dev->trig); > + > + return IRQ_HANDLED; > +} > + > +/* > + * sca3300_init - Device init sequence. See datasheet rev 2 section > + * 4.2 Start-Up Sequence for details. > + */ > +static int sca3300_init(struct sca3300_data *sca_data, > + struct iio_dev *indio_dev) > +{ > + int value = 0; > + int ret; > + > + ret = sca3300_write_reg(sca_data, SCA3300_REG_MODE, > + SCA3300_MODE_SW_RESET); > + if (ret) > + return ret; > + > + /* > + * Wait 1ms after SW-reset command. > + * Wait 15ms for settling of signal paths. > + */ > + usleep_range(16e3, 50e3); > + > + ret = sca3300_read_reg(sca_data, SCA3300_REG_WHOAMI, &value); > + if (ret) > + return ret; > + > + if (value != SCA3300_WHOAMI_ID) { > + dev_err(&sca_data->spi->dev, > + "device id not expected value, %d != %u\n", > + value, SCA3300_WHOAMI_ID); > + return -ENODEV; > + } > + return 0; > +} > + > +static int sca3300_debugfs_reg_access(struct iio_dev *indio_dev, > + unsigned int reg, unsigned int writeval, > + unsigned int *readval) > +{ > + struct sca3300_data *data = iio_priv(indio_dev); > + int value; > + int ret; > + > + if (reg > SCA3300_REG_SELBANK) > + return -EINVAL; > + > + if (!readval) > + return sca3300_write_reg(data, reg, writeval); > + > + ret = sca3300_read_reg(data, reg, &value); > + if (ret) > + return ret; > + > + *readval = value; > + > + return 0; > +} > + > +static int sca3300_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: > + *vals = (const int *)sca3300_accel_scale; > + *length = ARRAY_SIZE(sca3300_accel_scale) * 2 - 2; > + *type = IIO_VAL_INT_PLUS_MICRO; > + return IIO_AVAIL_LIST; > + case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: > + *vals = &sca3300_lp_freq[2]; > + *length = 2; > + *type = IIO_VAL_INT; > + return IIO_AVAIL_LIST; > + default: > + return -EINVAL; > + } > +} > + > +static const struct iio_info sca3300_info = { > + .read_raw = sca3300_read_raw, > + .write_raw = sca3300_write_raw, > + .debugfs_reg_access = &sca3300_debugfs_reg_access, > + .read_avail = sca3300_read_avail, > +}; > + > +static int sca3300_probe(struct spi_device *spi) > +{ > + struct sca3300_data *sca_data; > + struct iio_dev *indio_dev; > + int ret; > + > + indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*sca_data)); > + if (!indio_dev) > + return -ENOMEM; > + > + sca_data = iio_priv(indio_dev); > + mutex_init(&sca_data->lock); > + sca_data->spi = spi; > + > + crc8_populate_msb(sca3300_crc_table, SCA3300_CRC8_POLYNOMIAL); > + > + indio_dev->info = &sca3300_info; > + indio_dev->name = SCA3300_ALIAS; > + indio_dev->modes = INDIO_DIRECT_MODE; > + indio_dev->channels = sca3300_channels; > + indio_dev->num_channels = ARRAY_SIZE(sca3300_channels); > + indio_dev->available_scan_masks = sca3300_scan_masks; > + > + ret = sca3300_init(sca_data, indio_dev); > + if (ret) { > + dev_err(&spi->dev, "failed to init device, error: %d\n", ret); > + return ret; > + } > + > + ret = devm_iio_triggered_buffer_setup(&spi->dev, indio_dev, > + iio_pollfunc_store_time, > + sca3300_trigger_handler, NULL); > + if (ret) { > + dev_err(&spi->dev, > + "iio triggered buffer setup failed, error: %d\n", ret); > + return ret; > + } > + > + ret = devm_iio_device_register(&spi->dev, indio_dev); > + if (ret) { > + dev_err(&spi->dev, "iio device register failed, error: %d\n", > + ret); > + } > + > + return ret; > +} > + > +static const struct of_device_id sca3300_dt_ids[] = { > + { .compatible = "murata,sca3300"}, > + {} > +}; > +MODULE_DEVICE_TABLE(of, sca3300_dt_ids); > + > +static struct spi_driver sca3300_driver = { > + .driver = { > + .name = SCA3300_ALIAS, > + .of_match_table = sca3300_dt_ids, > + }, > + .probe = sca3300_probe, > +}; > +module_spi_driver(sca3300_driver); > + > +MODULE_AUTHOR("Tomas Melin <tomas.melin@vaisala.com>"); > +MODULE_DESCRIPTION("Murata SCA3300 SPI Accelerometer"); > +MODULE_LICENSE("GPL v2"); > -- > 2.21.3 >
diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig index cceda3cecbcf..0dbf7b648e8a 100644 --- a/drivers/iio/accel/Kconfig +++ b/drivers/iio/accel/Kconfig @@ -450,6 +450,19 @@ config SCA3000 To compile this driver as a module, say M here: the module will be called sca3000. +config SCA3300 + tristate "Murata SCA3300 3-Axis Accelerometer Driver" + depends on SPI + select CRC8 + select IIO_BUFFER + select IIO_TRIGGERED_BUFFER + help + Say yes here to build support for Murata SCA3300 3-Axis + accelerometer. + + To compile this driver as a module, choose M here: the module will be + called sca3300. + config STK8312 tristate "Sensortek STK8312 3-Axis Accelerometer Driver" depends on I2C diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile index 32cd1342a31a..4b56527a2b97 100644 --- a/drivers/iio/accel/Makefile +++ b/drivers/iio/accel/Makefile @@ -50,6 +50,7 @@ obj-$(CONFIG_MXC4005) += mxc4005.o obj-$(CONFIG_MXC6255) += mxc6255.o obj-$(CONFIG_SCA3000) += sca3000.o +obj-$(CONFIG_SCA3300) += sca3300.o obj-$(CONFIG_STK8312) += stk8312.o obj-$(CONFIG_STK8BA50) += stk8ba50.o diff --git a/drivers/iio/accel/sca3300.c b/drivers/iio/accel/sca3300.c new file mode 100644 index 000000000000..f7ef8ecfd34a --- /dev/null +++ b/drivers/iio/accel/sca3300.c @@ -0,0 +1,472 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Murata SCA3300 3-axis industrial accelerometer + * + * Copyright (c) 2021 Vaisala Oyj. All rights reserved. + */ + +#include <linux/bitops.h> +#include <linux/crc8.h> +#include <linux/delay.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/spi/spi.h> + +#include <asm/unaligned.h> + +#include <linux/iio/buffer.h> +#include <linux/iio/iio.h> +#include <linux/iio/sysfs.h> +#include <linux/iio/trigger_consumer.h> +#include <linux/iio/triggered_buffer.h> + +#define SCA3300_ALIAS "sca3300" + +#define SCA3300_CRC8_POLYNOMIAL 0x1d + +/* Device mode register */ +#define SCA3300_REG_MODE 0xd +#define SCA3300_MODE_SW_RESET 0x20 + +/* Last register in map */ +#define SCA3300_REG_SELBANK 0x1f + +/* Device status and mask */ +#define SCA3300_REG_STATUS 0x6 +#define SCA3300_STATUS_MASK GENMASK(8, 0) + +/* Device ID */ +#define SCA3300_REG_WHOAMI 0x10 +#define SCA3300_WHOAMI_ID 0x51 + +/* Device return status and mask */ +#define SCA3300_VALUE_RS_ERROR 0x3 +#define SCA3300_MASK_RS_STATUS GENMASK(1, 0) + +enum sca3300_scan_indexes { + SCA3300_ACC_X = 0, + SCA3300_ACC_Y, + SCA3300_ACC_Z, + SCA3300_TEMP, + SCA3300_TIMESTAMP, +}; + +#define SCA3300_ACCEL_CHANNEL(index, reg, axis) { \ + .type = IIO_ACCEL, \ + .address = reg, \ + .modified = 1, \ + .channel2 = IIO_MOD_##axis, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_shared_by_type = \ + BIT(IIO_CHAN_INFO_SCALE) | \ + BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \ + .info_mask_shared_by_type_available = \ + BIT(IIO_CHAN_INFO_SCALE) | \ + BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \ + .scan_index = index, \ + .scan_type = { \ + .sign = 's', \ + .realbits = 16, \ + .storagebits = 16, \ + .endianness = IIO_CPU, \ + }, \ +} + +static const struct iio_chan_spec sca3300_channels[] = { + SCA3300_ACCEL_CHANNEL(SCA3300_ACC_X, 0x1, X), + SCA3300_ACCEL_CHANNEL(SCA3300_ACC_Y, 0x2, Y), + SCA3300_ACCEL_CHANNEL(SCA3300_ACC_Z, 0x3, Z), + { + .type = IIO_TEMP, + .address = 0x5, + .scan_index = SCA3300_TEMP, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), + .scan_type = { + .sign = 's', + .realbits = 16, + .storagebits = 16, + .endianness = IIO_CPU, + }, + }, + IIO_CHAN_SOFT_TIMESTAMP(4), +}; + +static const int sca3300_lp_freq[] = {70, 70, 70, 10}; +static const int sca3300_accel_scale[][2] = {{0, 370}, {0, 741}, {0, 185}, {0, 185}}; + +static const unsigned long sca3300_scan_masks[] = { + BIT(SCA3300_ACC_X) | BIT(SCA3300_ACC_Y) | BIT(SCA3300_ACC_Z) | + BIT(SCA3300_TEMP), + 0 +}; + +/** + * struct sca3300_data - device data + * @spi: SPI device structure + * @lock: Data buffer lock + * @scan: Triggered buffer. Four channel 16-bit data + 64-bit timestamp + * @txbuf: Transmit buffer + * @rxbuf: Receive buffer + */ +struct sca3300_data { + struct spi_device *spi; + struct mutex lock; + struct { + s16 channels[4]; + s64 ts __aligned(sizeof(s64)); + } scan; + u8 txbuf[4] ____cacheline_aligned; + u8 rxbuf[4]; +}; + +DECLARE_CRC8_TABLE(sca3300_crc_table); + +static int sca3300_transfer(struct sca3300_data *sca_data, int *val) +{ + /* Consecutive requests min. 10 us delay (Datasheet section 5.1.2) */ + struct spi_delay delay = { .value = 10, .unit = SPI_DELAY_UNIT_USECS }; + int32_t ret; + int rs; + u8 crc; + struct spi_transfer xfers[2] = { + { + .tx_buf = sca_data->txbuf, + .len = ARRAY_SIZE(sca_data->txbuf), + .delay = delay, + .cs_change = 1, + }, + { + .rx_buf = sca_data->rxbuf, + .len = ARRAY_SIZE(sca_data->rxbuf), + .delay = delay, + } + }; + + /* inverted crc value as described in device data sheet */ + crc = ~crc8(sca3300_crc_table, &sca_data->txbuf[0], 3, CRC8_INIT_VALUE); + sca_data->txbuf[3] = crc; + + ret = spi_sync_transfer(sca_data->spi, xfers, ARRAY_SIZE(xfers)); + if (ret) { + dev_err(&sca_data->spi->dev, + "transfer error, error: %d\n", ret); + return -EIO; + } + + crc = ~crc8(sca3300_crc_table, &sca_data->rxbuf[0], 3, CRC8_INIT_VALUE); + if (sca_data->rxbuf[3] != crc) { + dev_err(&sca_data->spi->dev, "CRC checksum mismatch"); + return -EIO; + } + + /* get return status */ + rs = sca_data->rxbuf[0] & SCA3300_MASK_RS_STATUS; + if (rs == SCA3300_VALUE_RS_ERROR) + ret = -EINVAL; + + *val = sign_extend32(get_unaligned_be16(&sca_data->rxbuf[1]), 15); + + return ret; +} + +static int sca3300_error_handler(struct sca3300_data *sca_data) +{ + int ret; + int val; + + mutex_lock(&sca_data->lock); + sca_data->txbuf[0] = SCA3300_REG_STATUS << 2; + ret = sca3300_transfer(sca_data, &val); + mutex_unlock(&sca_data->lock); + /* + * Return status error is cleared after reading status register once, + * expect EINVAL here. + */ + if (ret != -EINVAL) { + dev_err(&sca_data->spi->dev, + "error reading device status: %d\n", ret); + return ret; + } + + dev_err(&sca_data->spi->dev, "device status: 0x%lx\n", + val & SCA3300_STATUS_MASK); + + return 0; +} + +static int sca3300_read_reg(struct sca3300_data *sca_data, u8 reg, int *val) +{ + int ret; + + mutex_lock(&sca_data->lock); + sca_data->txbuf[0] = reg << 2; + ret = sca3300_transfer(sca_data, val); + mutex_unlock(&sca_data->lock); + if (ret != -EINVAL) + return ret; + + return sca3300_error_handler(sca_data); +} + +static int sca3300_write_reg(struct sca3300_data *sca_data, u8 reg, int val) +{ + int reg_val = 0; + int ret; + + mutex_lock(&sca_data->lock); + /* BIT(7) for write operation */ + sca_data->txbuf[0] = BIT(7) | (reg << 2); + put_unaligned_be16(val, &sca_data->txbuf[1]); + ret = sca3300_transfer(sca_data, ®_val); + mutex_unlock(&sca_data->lock); + if (ret != -EINVAL) + return ret; + + return sca3300_error_handler(sca_data); +} + +static int sca3300_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + struct sca3300_data *data = iio_priv(indio_dev); + int reg_val; + int ret; + int i; + + switch (mask) { + case IIO_CHAN_INFO_SCALE: + if (val) + return -EINVAL; + + for (i = 0; i < ARRAY_SIZE(sca3300_accel_scale); i++) { + if (val2 == sca3300_accel_scale[i][1]) + return sca3300_write_reg(data, SCA3300_REG_MODE, i); + } + return -EINVAL; + + case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: + ret = sca3300_read_reg(data, SCA3300_REG_MODE, ®_val); + if (ret) + return ret; + /* freq. change is possible only for mode 3 and 4 */ + if (reg_val == 2 && val == sca3300_lp_freq[3]) + return sca3300_write_reg(data, SCA3300_REG_MODE, 3); + if (reg_val == 3 && val == sca3300_lp_freq[2]) + return sca3300_write_reg(data, SCA3300_REG_MODE, 2); + return -EINVAL; + default: + return -EINVAL; + } +} + +static int sca3300_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct sca3300_data *data = iio_priv(indio_dev); + int ret; + int reg_val; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + ret = sca3300_read_reg(data, chan->address, val); + if (ret) + return ret; + return IIO_VAL_INT; + case IIO_CHAN_INFO_SCALE: + ret = sca3300_read_reg(data, SCA3300_REG_MODE, ®_val); + if (ret) + return ret; + *val = 0; + *val2 = sca3300_accel_scale[reg_val][1]; + return IIO_VAL_INT_PLUS_MICRO; + case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: + ret = sca3300_read_reg(data, SCA3300_REG_MODE, ®_val); + if (ret) + return ret; + *val = sca3300_lp_freq[reg_val]; + return IIO_VAL_INT; + default: + return -EINVAL; + } +} + +static irqreturn_t sca3300_trigger_handler(int irq, void *p) +{ + struct iio_poll_func *pf = p; + struct iio_dev *indio_dev = pf->indio_dev; + struct sca3300_data *data = iio_priv(indio_dev); + int bit, ret, val, i = 0; + + for_each_set_bit(bit, indio_dev->active_scan_mask, + indio_dev->masklength) { + ret = sca3300_read_reg(data, sca3300_channels[bit].address, + &val); + if (ret) { + dev_err_ratelimited(&data->spi->dev, + "failed to read register, error: %d\n", ret); + /* handled, but bailing out due to errors */ + goto out; + } + data->scan.channels[i++] = val; + } + + iio_push_to_buffers_with_timestamp(indio_dev, &data->scan, + iio_get_time_ns(indio_dev)); +out: + iio_trigger_notify_done(indio_dev->trig); + + return IRQ_HANDLED; +} + +/* + * sca3300_init - Device init sequence. See datasheet rev 2 section + * 4.2 Start-Up Sequence for details. + */ +static int sca3300_init(struct sca3300_data *sca_data, + struct iio_dev *indio_dev) +{ + int value = 0; + int ret; + + ret = sca3300_write_reg(sca_data, SCA3300_REG_MODE, + SCA3300_MODE_SW_RESET); + if (ret) + return ret; + + /* + * Wait 1ms after SW-reset command. + * Wait 15ms for settling of signal paths. + */ + usleep_range(16e3, 50e3); + + ret = sca3300_read_reg(sca_data, SCA3300_REG_WHOAMI, &value); + if (ret) + return ret; + + if (value != SCA3300_WHOAMI_ID) { + dev_err(&sca_data->spi->dev, + "device id not expected value, %d != %u\n", + value, SCA3300_WHOAMI_ID); + return -ENODEV; + } + return 0; +} + +static int sca3300_debugfs_reg_access(struct iio_dev *indio_dev, + unsigned int reg, unsigned int writeval, + unsigned int *readval) +{ + struct sca3300_data *data = iio_priv(indio_dev); + int value; + int ret; + + if (reg > SCA3300_REG_SELBANK) + return -EINVAL; + + if (!readval) + return sca3300_write_reg(data, reg, writeval); + + ret = sca3300_read_reg(data, reg, &value); + if (ret) + return ret; + + *readval = value; + + return 0; +} + +static int sca3300_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: + *vals = (const int *)sca3300_accel_scale; + *length = ARRAY_SIZE(sca3300_accel_scale) * 2 - 2; + *type = IIO_VAL_INT_PLUS_MICRO; + return IIO_AVAIL_LIST; + case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: + *vals = &sca3300_lp_freq[2]; + *length = 2; + *type = IIO_VAL_INT; + return IIO_AVAIL_LIST; + default: + return -EINVAL; + } +} + +static const struct iio_info sca3300_info = { + .read_raw = sca3300_read_raw, + .write_raw = sca3300_write_raw, + .debugfs_reg_access = &sca3300_debugfs_reg_access, + .read_avail = sca3300_read_avail, +}; + +static int sca3300_probe(struct spi_device *spi) +{ + struct sca3300_data *sca_data; + struct iio_dev *indio_dev; + int ret; + + indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*sca_data)); + if (!indio_dev) + return -ENOMEM; + + sca_data = iio_priv(indio_dev); + mutex_init(&sca_data->lock); + sca_data->spi = spi; + + crc8_populate_msb(sca3300_crc_table, SCA3300_CRC8_POLYNOMIAL); + + indio_dev->info = &sca3300_info; + indio_dev->name = SCA3300_ALIAS; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->channels = sca3300_channels; + indio_dev->num_channels = ARRAY_SIZE(sca3300_channels); + indio_dev->available_scan_masks = sca3300_scan_masks; + + ret = sca3300_init(sca_data, indio_dev); + if (ret) { + dev_err(&spi->dev, "failed to init device, error: %d\n", ret); + return ret; + } + + ret = devm_iio_triggered_buffer_setup(&spi->dev, indio_dev, + iio_pollfunc_store_time, + sca3300_trigger_handler, NULL); + if (ret) { + dev_err(&spi->dev, + "iio triggered buffer setup failed, error: %d\n", ret); + return ret; + } + + ret = devm_iio_device_register(&spi->dev, indio_dev); + if (ret) { + dev_err(&spi->dev, "iio device register failed, error: %d\n", + ret); + } + + return ret; +} + +static const struct of_device_id sca3300_dt_ids[] = { + { .compatible = "murata,sca3300"}, + {} +}; +MODULE_DEVICE_TABLE(of, sca3300_dt_ids); + +static struct spi_driver sca3300_driver = { + .driver = { + .name = SCA3300_ALIAS, + .of_match_table = sca3300_dt_ids, + }, + .probe = sca3300_probe, +}; +module_spi_driver(sca3300_driver); + +MODULE_AUTHOR("Tomas Melin <tomas.melin@vaisala.com>"); +MODULE_DESCRIPTION("Murata SCA3300 SPI Accelerometer"); +MODULE_LICENSE("GPL v2");
Add initial support for Murata SCA3300 3-axis industrial accelerometer with digital SPI interface. This device also provides a temperature measurement. Datasheet: https://www.murata.com/en-global/products/sensor/accel/sca3300 Signed-off-by: Tomas Melin <tomas.melin@vaisala.com> --- drivers/iio/accel/Kconfig | 13 + drivers/iio/accel/Makefile | 1 + drivers/iio/accel/sca3300.c | 472 ++++++++++++++++++++++++++++++++++++ 3 files changed, 486 insertions(+) create mode 100644 drivers/iio/accel/sca3300.c