diff options
author | Jean-Baptiste Maneyrol <jmaneyrol@invensense.com> | 2020-06-22 17:37:19 +0200 |
---|---|---|
committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2020-06-27 14:20:08 +0100 |
commit | 9f9ff91b775b568128aad3a5c06211a8785bd17c (patch) | |
tree | f2cfe7278c27f447cd5b1b9b179c68278cc70577 | |
parent | 7297ef1e261672b8c25ea5d4bb7e91806bb5fb18 (diff) | |
download | linux-9f9ff91b775b568128aad3a5c06211a8785bd17c.tar.bz2 |
iio: imu: inv_icm42600: add SPI driver for inv_icm42600 driver
Add SPI driver for InvenSense ICM-426xxx devices.
Configure bus signal slew rates as indicated in the datasheet.
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_spi.c | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/drivers/iio/imu/inv_icm42600/inv_icm42600_spi.c b/drivers/iio/imu/inv_icm42600/inv_icm42600_spi.c new file mode 100644 index 000000000000..a9c5e2fdbe2a --- /dev/null +++ b/drivers/iio/imu/inv_icm42600/inv_icm42600_spi.c @@ -0,0 +1,99 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2020 InvenSense, Inc. + */ + +#include <linux/kernel.h> +#include <linux/device.h> +#include <linux/module.h> +#include <linux/mod_devicetable.h> +#include <linux/spi/spi.h> +#include <linux/regmap.h> +#include <linux/property.h> + +#include "inv_icm42600.h" + +static int inv_icm42600_spi_bus_setup(struct inv_icm42600_state *st) +{ + unsigned int mask, val; + int ret; + + /* setup interface registers */ + val = INV_ICM42600_INTF_CONFIG6_I3C_EN | + INV_ICM42600_INTF_CONFIG6_I3C_SDR_EN | + INV_ICM42600_INTF_CONFIG6_I3C_DDR_EN; + ret = regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG6, + INV_ICM42600_INTF_CONFIG6_MASK, val); + if (ret) + return ret; + + ret = regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG4, + INV_ICM42600_INTF_CONFIG4_I3C_BUS_ONLY, 0); + if (ret) + return ret; + + /* set slew rates for I2C and SPI */ + mask = INV_ICM42600_DRIVE_CONFIG_I2C_MASK | + INV_ICM42600_DRIVE_CONFIG_SPI_MASK; + val = INV_ICM42600_DRIVE_CONFIG_I2C(INV_ICM42600_SLEW_RATE_20_60NS) | + INV_ICM42600_DRIVE_CONFIG_SPI(INV_ICM42600_SLEW_RATE_INF_2NS); + ret = regmap_update_bits(st->map, INV_ICM42600_REG_DRIVE_CONFIG, + mask, val); + if (ret) + return ret; + + /* disable i2c bus */ + return regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG0, + INV_ICM42600_INTF_CONFIG0_UI_SIFS_CFG_MASK, + INV_ICM42600_INTF_CONFIG0_UI_SIFS_CFG_I2C_DIS); +} + +static int inv_icm42600_probe(struct spi_device *spi) +{ + const void *match; + enum inv_icm42600_chip chip; + struct regmap *regmap; + + match = device_get_match_data(&spi->dev); + if (!match) + return -EINVAL; + chip = (enum inv_icm42600_chip)match; + + regmap = devm_regmap_init_spi(spi, &inv_icm42600_regmap_config); + if (IS_ERR(regmap)) + return PTR_ERR(regmap); + + return inv_icm42600_core_probe(regmap, chip, inv_icm42600_spi_bus_setup); +} + +static const struct of_device_id inv_icm42600_of_matches[] = { + { + .compatible = "invensense,icm42600", + .data = (void *)INV_CHIP_ICM42600, + }, { + .compatible = "invensense,icm42602", + .data = (void *)INV_CHIP_ICM42602, + }, { + .compatible = "invensense,icm42605", + .data = (void *)INV_CHIP_ICM42605, + }, { + .compatible = "invensense,icm42622", + .data = (void *)INV_CHIP_ICM42622, + }, + {} +}; +MODULE_DEVICE_TABLE(of, inv_icm42600_of_matches); + +static struct spi_driver inv_icm42600_driver = { + .driver = { + .name = "inv-icm42600-spi", + .of_match_table = inv_icm42600_of_matches, + .pm = &inv_icm42600_pm_ops, + }, + .probe = inv_icm42600_probe, +}; +module_spi_driver(inv_icm42600_driver); + +MODULE_AUTHOR("InvenSense, Inc."); +MODULE_DESCRIPTION("InvenSense ICM-426xx SPI driver"); +MODULE_LICENSE("GPL"); |