drivers/iio/imu/inv_icm42600/inv_icm42600_spi.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2020 InvenSense, Inc.
   4  */
   5
   6 #include <linux/kernel.h>
   7 #include <linux/device.h>
   8 #include <linux/module.h>
   9 #include <linux/mod_devicetable.h>
  10 #include <linux/spi/spi.h>
  11 #include <linux/regmap.h>
  12 #include <linux/property.h>
  13
  14 #include "inv_icm42600.h"
  15
  16 static int inv_icm42600_spi_bus_setup(struct inv_icm42600_state *st)
  17 {
  18         unsigned int mask, val;
  19         int ret;
  20
  21         /* setup interface registers */
  22         val = INV_ICM42600_INTF_CONFIG6_I3C_EN |
  23               INV_ICM42600_INTF_CONFIG6_I3C_SDR_EN |
  24               INV_ICM42600_INTF_CONFIG6_I3C_DDR_EN;
  25         ret = regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG6,
  26                                  INV_ICM42600_INTF_CONFIG6_MASK, val);
  27         if (ret)
  28                 return ret;
  29
  30         ret = regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG4,
  31                                  INV_ICM42600_INTF_CONFIG4_I3C_BUS_ONLY, 0);
  32         if (ret)
  33                 return ret;
  34
  35         /* set slew rates for I2C and SPI */
  36         mask = INV_ICM42600_DRIVE_CONFIG_I2C_MASK |
  37                INV_ICM42600_DRIVE_CONFIG_SPI_MASK;
  38         val = INV_ICM42600_DRIVE_CONFIG_I2C(INV_ICM42600_SLEW_RATE_20_60NS) |
  39               INV_ICM42600_DRIVE_CONFIG_SPI(INV_ICM42600_SLEW_RATE_INF_2NS);
  40         ret = regmap_update_bits(st->map, INV_ICM42600_REG_DRIVE_CONFIG,
  41                                  mask, val);
  42         if (ret)
  43                 return ret;
  44
  45         /* disable i2c bus */
  46         return regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG0,
  47                                   INV_ICM42600_INTF_CONFIG0_UI_SIFS_CFG_MASK,
  48                                   INV_ICM42600_INTF_CONFIG0_UI_SIFS_CFG_I2C_DIS);
  49 }
  50
  51 static int inv_icm42600_probe(struct spi_device *spi)
  52 {
  53         const void *match;
  54         enum inv_icm42600_chip chip;
  55         struct regmap *regmap;
  56
  57         match = device_get_match_data(&spi->dev);
  58         if (!match)
  59                 return -EINVAL;
  60         chip = (uintptr_t)match;
  61
  62         regmap = devm_regmap_init_spi(spi, &inv_icm42600_regmap_config);
  63         if (IS_ERR(regmap))
  64                 return PTR_ERR(regmap);
  65
  66         return inv_icm42600_core_probe(regmap, chip, spi->irq,
  67                                        inv_icm42600_spi_bus_setup);
  68 }
  69
  70 static const struct of_device_id inv_icm42600_of_matches[] = {
  71         {
  72                 .compatible = "invensense,icm42600",
  73                 .data = (void *)INV_CHIP_ICM42600,
  74         }, {
  75                 .compatible = "invensense,icm42602",
  76                 .data = (void *)INV_CHIP_ICM42602,
  77         }, {
  78                 .compatible = "invensense,icm42605",
  79                 .data = (void *)INV_CHIP_ICM42605,
  80         }, {
  81                 .compatible = "invensense,icm42622",
  82                 .data = (void *)INV_CHIP_ICM42622,
  83         }, {
  84                 .compatible = "invensense,icm42631",
  85                 .data = (void *)INV_CHIP_ICM42631,
  86         },
  87         {}
  88 };
  89 MODULE_DEVICE_TABLE(of, inv_icm42600_of_matches);
  90
  91 static struct spi_driver inv_icm42600_driver = {
  92         .driver = {
  93                 .name = "inv-icm42600-spi",
  94                 .of_match_table = inv_icm42600_of_matches,
  95                 .pm = pm_ptr(&inv_icm42600_pm_ops),
  96         },
  97         .probe = inv_icm42600_probe,
  98 };
  99 module_spi_driver(inv_icm42600_driver);
 100
 101 MODULE_AUTHOR("InvenSense, Inc.");
 102 MODULE_DESCRIPTION("InvenSense ICM-426xx SPI driver");
 103 MODULE_LICENSE("GPL");
 104 MODULE_IMPORT_NS(IIO_ICM42600);