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_clear_bits(st->map, INV_ICM42600_REG_INTF_CONFIG4,
  31                                 INV_ICM42600_INTF_CONFIG4_I3C_BUS_ONLY);
  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 /*
  71  * device id table is used to identify what device can be
  72  * supported by this driver
  73  */
  74 static const struct spi_device_id inv_icm42600_id[] = {
  75         { "icm42600", INV_CHIP_ICM42600 },
  76         { "icm42602", INV_CHIP_ICM42602 },
  77         { "icm42605", INV_CHIP_ICM42605 },
  78         { "icm42686", INV_CHIP_ICM42686 },
  79         { "icm42622", INV_CHIP_ICM42622 },
  80         { "icm42688", INV_CHIP_ICM42688 },
  81         { "icm42631", INV_CHIP_ICM42631 },
  82         { }
  83 };
  84 MODULE_DEVICE_TABLE(spi, inv_icm42600_id);
  85
  86 static const struct of_device_id inv_icm42600_of_matches[] = {
  87         {
  88                 .compatible = "invensense,icm42600",
  89                 .data = (void *)INV_CHIP_ICM42600,
  90         }, {
  91                 .compatible = "invensense,icm42602",
  92                 .data = (void *)INV_CHIP_ICM42602,
  93         }, {
  94                 .compatible = "invensense,icm42605",
  95                 .data = (void *)INV_CHIP_ICM42605,
  96         }, {
  97                 .compatible = "invensense,icm42686",
  98                 .data = (void *)INV_CHIP_ICM42686,
  99         }, {
 100                 .compatible = "invensense,icm42622",
 101                 .data = (void *)INV_CHIP_ICM42622,
 102         }, {
 103                 .compatible = "invensense,icm42688",
 104                 .data = (void *)INV_CHIP_ICM42688,
 105         }, {
 106                 .compatible = "invensense,icm42631",
 107                 .data = (void *)INV_CHIP_ICM42631,
 108         },
 109         {}
 110 };
 111 MODULE_DEVICE_TABLE(of, inv_icm42600_of_matches);
 112
 113 static struct spi_driver inv_icm42600_driver = {
 114         .driver = {
 115                 .name = "inv-icm42600-spi",
 116                 .of_match_table = inv_icm42600_of_matches,
 117                 .pm = pm_ptr(&inv_icm42600_pm_ops),
 118         },
 119         .id_table = inv_icm42600_id,
 120         .probe = inv_icm42600_probe,
 121 };
 122 module_spi_driver(inv_icm42600_driver);
 123
 124 MODULE_AUTHOR("InvenSense, Inc.");
 125 MODULE_DESCRIPTION("InvenSense ICM-426xx SPI driver");
 126 MODULE_LICENSE("GPL");
 127 MODULE_IMPORT_NS("IIO_ICM42600");