imu/inv_icm42600/inv_icm42600_spi.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * Copyright (C) 2020 InvenSense, Inc.
0004  */
0005
0006 #include <linux/kernel.h>
0007 #include <linux/device.h>
0008 #include <linux/module.h>
0009 #include <linux/mod_devicetable.h>
0010 #include <linux/spi/spi.h>
0011 #include <linux/regmap.h>
0012 #include <linux/property.h>
0013
0014 #include "inv_icm42600.h"
0015
0016 static int inv_icm42600_spi_bus_setup(struct inv_icm42600_state *st)
0017 {
0018     unsigned int mask, val;
0019     int ret;
0020
0021     /* setup interface registers */
0022     val = INV_ICM42600_INTF_CONFIG6_I3C_EN |
0023           INV_ICM42600_INTF_CONFIG6_I3C_SDR_EN |
0024           INV_ICM42600_INTF_CONFIG6_I3C_DDR_EN;
0025     ret = regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG6,
0026                  INV_ICM42600_INTF_CONFIG6_MASK, val);
0027     if (ret)
0028         return ret;
0029
0030     ret = regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG4,
0031                  INV_ICM42600_INTF_CONFIG4_I3C_BUS_ONLY, 0);
0032     if (ret)
0033         return ret;
0034
0035     /* set slew rates for I2C and SPI */
0036     mask = INV_ICM42600_DRIVE_CONFIG_I2C_MASK |
0037            INV_ICM42600_DRIVE_CONFIG_SPI_MASK;
0038     val = INV_ICM42600_DRIVE_CONFIG_I2C(INV_ICM42600_SLEW_RATE_20_60NS) |
0039           INV_ICM42600_DRIVE_CONFIG_SPI(INV_ICM42600_SLEW_RATE_INF_2NS);
0040     ret = regmap_update_bits(st->map, INV_ICM42600_REG_DRIVE_CONFIG,
0041                  mask, val);
0042     if (ret)
0043         return ret;
0044
0045     /* disable i2c bus */
0046     return regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG0,
0047                   INV_ICM42600_INTF_CONFIG0_UI_SIFS_CFG_MASK,
0048                   INV_ICM42600_INTF_CONFIG0_UI_SIFS_CFG_I2C_DIS);
0049 }
0050
0051 static int inv_icm42600_probe(struct spi_device *spi)
0052 {
0053     const void *match;
0054     enum inv_icm42600_chip chip;
0055     struct regmap *regmap;
0056
0057     match = device_get_match_data(&spi->dev);
0058     if (!match)
0059         return -EINVAL;
0060     chip = (uintptr_t)match;
0061
0062     regmap = devm_regmap_init_spi(spi, &inv_icm42600_regmap_config);
0063     if (IS_ERR(regmap))
0064         return PTR_ERR(regmap);
0065
0066     return inv_icm42600_core_probe(regmap, chip, spi->irq,
0067                        inv_icm42600_spi_bus_setup);
0068 }
0069
0070 static const struct of_device_id inv_icm42600_of_matches[] = {
0071     {
0072         .compatible = "invensense,icm42600",
0073         .data = (void *)INV_CHIP_ICM42600,
0074     }, {
0075         .compatible = "invensense,icm42602",
0076         .data = (void *)INV_CHIP_ICM42602,
0077     }, {
0078         .compatible = "invensense,icm42605",
0079         .data = (void *)INV_CHIP_ICM42605,
0080     }, {
0081         .compatible = "invensense,icm42622",
0082         .data = (void *)INV_CHIP_ICM42622,
0083     },
0084     {}
0085 };
0086 MODULE_DEVICE_TABLE(of, inv_icm42600_of_matches);
0087
0088 static struct spi_driver inv_icm42600_driver = {
0089     .driver = {
0090         .name = "inv-icm42600-spi",
0091         .of_match_table = inv_icm42600_of_matches,
0092         .pm = &inv_icm42600_pm_ops,
0093     },
0094     .probe = inv_icm42600_probe,
0095 };
0096 module_spi_driver(inv_icm42600_driver);
0097
0098 MODULE_AUTHOR("InvenSense, Inc.");
0099 MODULE_DESCRIPTION("InvenSense ICM-426xx SPI driver");
0100 MODULE_LICENSE("GPL");