cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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bmi088-accel-spi.c (2099B)

      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
     16static 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
     24static 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
     37static struct regmap_bus bmi088_regmap_bus = {
     38	.write = bmi088_regmap_spi_write,
     39	.read = bmi088_regmap_spi_read,
     40};
     41
     42static 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, id->name,
     56				       true);
     57}
     58
     59static void bmi088_accel_remove(struct spi_device *spi)
     60{
     61	bmi088_accel_core_remove(&spi->dev);
     62}
     63
     64static const struct spi_device_id bmi088_accel_id[] = {
     65	{"bmi088-accel", },
     66	{}
     67};
     68MODULE_DEVICE_TABLE(spi, bmi088_accel_id);
     69
     70static struct spi_driver bmi088_accel_driver = {
     71	.driver = {
     72		.name	= "bmi088_accel_spi",
     73		.pm	= &bmi088_accel_pm_ops,
     74	},
     75	.probe		= bmi088_accel_probe,
     76	.remove		= bmi088_accel_remove,
     77	.id_table	= bmi088_accel_id,
     78};
     79module_spi_driver(bmi088_accel_driver);
     80
     81MODULE_AUTHOR("Niek van Agt <niek.van.agt@topicproducts.com>");
     82MODULE_LICENSE("GPL v2");
     83MODULE_DESCRIPTION("BMI088 accelerometer driver (SPI)");
     84MODULE_IMPORT_NS(IIO_BMI088);