1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) 2 3 #include <linux/iio/iio.h> 4 #include <linux/mod_devicetable.h> 5 #include <linux/module.h> 6 #include <linux/pm.h> 7 #include <linux/regmap.h> 8 #include <linux/spi/spi.h> 9 10 #include "bmi270.h" 11 12 /* 13 * The following two functions are taken from the BMI323 spi driver code. 14 * In section 6.4 of the BMI270 data it specifies that after a read 15 * operation the first data byte from the device is a dummy byte 16 */ 17 static int bmi270_regmap_spi_read(void *spi, const void *reg_buf, 18 size_t reg_size, void *val_buf, 19 size_t val_size) 20 { 21 return spi_write_then_read(spi, reg_buf, reg_size, val_buf, val_size); 22 } 23 24 static int bmi270_regmap_spi_write(void *spi, const void *data, 25 size_t count) 26 { 27 u8 *data_buff = (u8 *)data; 28 29 /* 30 * Remove the extra pad byte since its only needed for the read 31 * operation 32 */ 33 data_buff[1] = data_buff[0]; 34 return spi_write_then_read(spi, data_buff + 1, count - 1, NULL, 0); 35 } 36 37 static const struct regmap_bus bmi270_regmap_bus = { 38 .read = bmi270_regmap_spi_read, 39 .write = bmi270_regmap_spi_write, 40 }; 41 42 static const struct regmap_config bmi270_spi_regmap_config = { 43 .reg_bits = 8, 44 .val_bits = 8, 45 .pad_bits = 8, 46 .read_flag_mask = BIT(7), 47 }; 48 49 static int bmi270_spi_probe(struct spi_device *spi) 50 { 51 struct regmap *regmap; 52 struct device *dev = &spi->dev; 53 const struct bmi270_chip_info *chip_info; 54 55 chip_info = spi_get_device_match_data(spi); 56 if (!chip_info) 57 return -ENODEV; 58 59 regmap = devm_regmap_init(dev, &bmi270_regmap_bus, dev, 60 &bmi270_spi_regmap_config); 61 if (IS_ERR(regmap)) 62 return dev_err_probe(dev, PTR_ERR(regmap), 63 "Failed to init i2c regmap"); 64 65 return bmi270_core_probe(dev, regmap, chip_info); 66 } 67 68 static const struct spi_device_id bmi270_spi_id[] = { 69 { "bmi260", (kernel_ulong_t)&bmi260_chip_info }, 70 { "bmi270", (kernel_ulong_t)&bmi270_chip_info }, 71 { } 72 }; 73 74 static const struct of_device_id bmi270_of_match[] = { 75 { .compatible = "bosch,bmi260", .data = &bmi260_chip_info }, 76 { .compatible = "bosch,bmi270", .data = &bmi270_chip_info }, 77 { } 78 }; 79 80 static struct spi_driver bmi270_spi_driver = { 81 .driver = { 82 .name = "bmi270", 83 .pm = pm_ptr(&bmi270_core_pm_ops), 84 .of_match_table = bmi270_of_match, 85 }, 86 .probe = bmi270_spi_probe, 87 .id_table = bmi270_spi_id, 88 }; 89 module_spi_driver(bmi270_spi_driver); 90 91 MODULE_AUTHOR("Alex Lanzano"); 92 MODULE_DESCRIPTION("BMI270 driver"); 93 MODULE_LICENSE("GPL"); 94 MODULE_IMPORT_NS("IIO_BMI270"); 95