drivers/iio/accel/bmi088-accel-spi.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * 3-axis accelerometer driver supporting following Bosch-Sensortec chips:
   4  *  - BMI088
   5  *
   6  * Copyright (c) 2018-2020, Topic Embedded Products
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/regmap.h>
  11 #include <linux/slab.h>
  12 #include <linux/spi/spi.h>
  13
  14 #include "bmi088-accel.h"
  15
  16 static int bmi088_regmap_spi_write(void *context, const void *data, size_t count)
  17 {
  18         struct spi_device *spi = context;
  19
  20         /* Write register is same as generic SPI */
  21         return spi_write(spi, data, count);
  22 }
  23
  24 static int bmi088_regmap_spi_read(void *context, const void *reg,
  25                                 size_t reg_size, void *val, size_t val_size)
  26 {
  27         struct spi_device *spi = context;
  28         u8 addr[2];
  29
  30         addr[0] = *(u8 *)reg;
  31         addr[0] |= BIT(7); /* Set RW = '1' */
  32         addr[1] = 0; /* Read requires a dummy byte transfer */
  33
  34         return spi_write_then_read(spi, addr, sizeof(addr), val, val_size);
  35 }
  36
  37 static struct regmap_bus bmi088_regmap_bus = {
  38         .write = bmi088_regmap_spi_write,
  39         .read = bmi088_regmap_spi_read,
  40 };
  41
  42 static int bmi088_accel_probe(struct spi_device *spi)
  43 {
  44         struct regmap *regmap;
  45         const struct spi_device_id *id = spi_get_device_id(spi);
  46
  47         regmap = devm_regmap_init(&spi->dev, &bmi088_regmap_bus,
  48                         spi, &bmi088_regmap_conf);
  49
  50         if (IS_ERR(regmap)) {
  51                 dev_err(&spi->dev, "Failed to initialize spi regmap\n");
  52                 return PTR_ERR(regmap);
  53         }
  54
  55         return bmi088_accel_core_probe(&spi->dev, regmap, spi->irq,
  56                                         id->driver_data);
  57 }
  58
  59 static void bmi088_accel_remove(struct spi_device *spi)
  60 {
  61         bmi088_accel_core_remove(&spi->dev);
  62 }
  63
  64 static const struct of_device_id bmi088_of_match[] = {
  65         { .compatible = "bosch,bmi085-accel" },
  66         { .compatible = "bosch,bmi088-accel" },
  67         { .compatible = "bosch,bmi090l-accel" },
  68         {}
  69 };
  70 MODULE_DEVICE_TABLE(of, bmi088_of_match);
  71
  72 static const struct spi_device_id bmi088_accel_id[] = {
  73         {"bmi085-accel",  BOSCH_BMI085},
  74         {"bmi088-accel",  BOSCH_BMI088},
  75         {"bmi090l-accel", BOSCH_BMI090L},
  76         {}
  77 };
  78 MODULE_DEVICE_TABLE(spi, bmi088_accel_id);
  79
  80 static struct spi_driver bmi088_accel_driver = {
  81         .driver = {
  82                 .name   = "bmi088_accel_spi",
  83                 .pm     = pm_ptr(&bmi088_accel_pm_ops),
  84                 .of_match_table = bmi088_of_match,
  85         },
  86         .probe          = bmi088_accel_probe,
  87         .remove         = bmi088_accel_remove,
  88         .id_table       = bmi088_accel_id,
  89 };
  90 module_spi_driver(bmi088_accel_driver);
  91
  92 MODULE_AUTHOR("Niek van Agt <niek.van.agt@topicproducts.com>");
  93 MODULE_LICENSE("GPL v2");
  94 MODULE_DESCRIPTION("BMI088 accelerometer driver (SPI)");
  95 MODULE_IMPORT_NS(IIO_BMI088);