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  *  - BMI085
   6  *  - BMI090L
   7  *
   8  * Copyright (c) 2018-2020, Topic Embedded Products
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/regmap.h>
  13 #include <linux/slab.h>
  14 #include <linux/spi/spi.h>
  15
  16 #include "bmi088-accel.h"
  17
  18 static int bmi088_regmap_spi_write(void *context, const void *data, size_t count)
  19 {
  20         struct spi_device *spi = context;
  21
  22         /* Write register is same as generic SPI */
  23         return spi_write(spi, data, count);
  24 }
  25
  26 static int bmi088_regmap_spi_read(void *context, const void *reg,
  27                                 size_t reg_size, void *val, size_t val_size)
  28 {
  29         struct spi_device *spi = context;
  30         u8 addr[2];
  31
  32         addr[0] = *(u8 *)reg;
  33         addr[0] |= BIT(7); /* Set RW = '1' */
  34         addr[1] = 0; /* Read requires a dummy byte transfer */
  35
  36         return spi_write_then_read(spi, addr, sizeof(addr), val, val_size);
  37 }
  38
  39 static const struct regmap_bus bmi088_regmap_bus = {
  40         .write = bmi088_regmap_spi_write,
  41         .read = bmi088_regmap_spi_read,
  42 };
  43
  44 static int bmi088_accel_probe(struct spi_device *spi)
  45 {
  46         struct regmap *regmap;
  47         const struct spi_device_id *id = spi_get_device_id(spi);
  48
  49         regmap = devm_regmap_init(&spi->dev, &bmi088_regmap_bus,
  50                         spi, &bmi088_regmap_conf);
  51
  52         if (IS_ERR(regmap)) {
  53                 dev_err(&spi->dev, "Failed to initialize spi regmap\n");
  54                 return PTR_ERR(regmap);
  55         }
  56
  57         return bmi088_accel_core_probe(&spi->dev, regmap, spi->irq,
  58                                         id->driver_data);
  59 }
  60
  61 static void bmi088_accel_remove(struct spi_device *spi)
  62 {
  63         bmi088_accel_core_remove(&spi->dev);
  64 }
  65
  66 static const struct of_device_id bmi088_of_match[] = {
  67         { .compatible = "bosch,bmi085-accel" },
  68         { .compatible = "bosch,bmi088-accel" },
  69         { .compatible = "bosch,bmi090l-accel" },
  70         {}
  71 };
  72 MODULE_DEVICE_TABLE(of, bmi088_of_match);
  73
  74 static const struct spi_device_id bmi088_accel_id[] = {
  75         {"bmi085-accel",  BOSCH_BMI085},
  76         {"bmi088-accel",  BOSCH_BMI088},
  77         {"bmi090l-accel", BOSCH_BMI090L},
  78         {}
  79 };
  80 MODULE_DEVICE_TABLE(spi, bmi088_accel_id);
  81
  82 static struct spi_driver bmi088_accel_driver = {
  83         .driver = {
  84                 .name   = "bmi088_accel_spi",
  85                 .pm     = pm_ptr(&bmi088_accel_pm_ops),
  86                 .of_match_table = bmi088_of_match,
  87         },
  88         .probe          = bmi088_accel_probe,
  89         .remove         = bmi088_accel_remove,
  90         .id_table       = bmi088_accel_id,
  91 };
  92 module_spi_driver(bmi088_accel_driver);
  93
  94 MODULE_AUTHOR("Niek van Agt <niek.van.agt@topicproducts.com>");
  95 MODULE_LICENSE("GPL v2");
  96 MODULE_DESCRIPTION("BMI088 accelerometer driver (SPI)");
  97 MODULE_IMPORT_NS(IIO_BMI088);