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 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); 98