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); 96