1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * SPI interface for the BMP280 driver 4 * 5 * Inspired by the older BMP085 driver drivers/misc/bmp085-spi.c 6 */ 7 #include <linux/module.h> 8 #include <linux/spi/spi.h> 9 #include <linux/err.h> 10 #include <linux/regmap.h> 11 12 #include "bmp280.h" 13 14 static int bmp280_regmap_spi_write(void *context, const void *data, 15 size_t count) 16 { 17 struct spi_device *spi = to_spi_device(context); 18 u8 buf[2]; 19 20 memcpy(buf, data, 2); 21 /* 22 * The SPI register address (= full register address without bit 7) and 23 * the write command (bit7 = RW = '0') 24 */ 25 buf[0] &= ~0x80; 26 27 return spi_write_then_read(spi, buf, 2, NULL, 0); 28 } 29 30 static int bmp280_regmap_spi_read(void *context, const void *reg, 31 size_t reg_size, void *val, size_t val_size) 32 { 33 struct spi_device *spi = to_spi_device(context); 34 35 return spi_write_then_read(spi, reg, reg_size, val, val_size); 36 } 37 38 static struct regmap_bus bmp280_regmap_bus = { 39 .write = bmp280_regmap_spi_write, 40 .read = bmp280_regmap_spi_read, 41 .reg_format_endian_default = REGMAP_ENDIAN_BIG, 42 .val_format_endian_default = REGMAP_ENDIAN_BIG, 43 }; 44 45 static int bmp280_spi_probe(struct spi_device *spi) 46 { 47 const struct spi_device_id *id = spi_get_device_id(spi); 48 const struct bmp280_chip_info *chip_info; 49 struct regmap *regmap; 50 int ret; 51 52 spi->bits_per_word = 8; 53 ret = spi_setup(spi); 54 if (ret < 0) { 55 dev_err(&spi->dev, "spi_setup failed!\n"); 56 return ret; 57 } 58 59 chip_info = spi_get_device_match_data(spi); 60 61 regmap = devm_regmap_init(&spi->dev, 62 &bmp280_regmap_bus, 63 &spi->dev, 64 chip_info->regmap_config); 65 if (IS_ERR(regmap)) { 66 dev_err(&spi->dev, "failed to allocate register map\n"); 67 return PTR_ERR(regmap); 68 } 69 70 return bmp280_common_probe(&spi->dev, 71 regmap, 72 chip_info, 73 id->name, 74 spi->irq); 75 } 76 77 static const struct of_device_id bmp280_of_spi_match[] = { 78 { .compatible = "bosch,bmp085", .data = &bmp180_chip_info }, 79 { .compatible = "bosch,bmp180", .data = &bmp180_chip_info }, 80 { .compatible = "bosch,bmp181", .data = &bmp180_chip_info }, 81 { .compatible = "bosch,bmp280", .data = &bmp280_chip_info }, 82 { .compatible = "bosch,bme280", .data = &bmp280_chip_info }, 83 { .compatible = "bosch,bmp380", .data = &bmp380_chip_info }, 84 { .compatible = "bosch,bmp580", .data = &bmp580_chip_info }, 85 { }, 86 }; 87 MODULE_DEVICE_TABLE(of, bmp280_of_spi_match); 88 89 static const struct spi_device_id bmp280_spi_id[] = { 90 { "bmp180", (kernel_ulong_t)&bmp180_chip_info }, 91 { "bmp181", (kernel_ulong_t)&bmp180_chip_info }, 92 { "bmp280", (kernel_ulong_t)&bmp280_chip_info }, 93 { "bme280", (kernel_ulong_t)&bmp280_chip_info }, 94 { "bmp380", (kernel_ulong_t)&bmp380_chip_info }, 95 { "bmp580", (kernel_ulong_t)&bmp580_chip_info }, 96 { } 97 }; 98 MODULE_DEVICE_TABLE(spi, bmp280_spi_id); 99 100 static struct spi_driver bmp280_spi_driver = { 101 .driver = { 102 .name = "bmp280", 103 .of_match_table = bmp280_of_spi_match, 104 .pm = pm_ptr(&bmp280_dev_pm_ops), 105 }, 106 .id_table = bmp280_spi_id, 107 .probe = bmp280_spi_probe, 108 }; 109 module_spi_driver(bmp280_spi_driver); 110 111 MODULE_DESCRIPTION("BMP280 SPI bus driver"); 112 MODULE_LICENSE("GPL"); 113 MODULE_IMPORT_NS(IIO_BMP280); 114