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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 | // SPDX-License-Identifier: GPL-2.0-only /* * SPI interface for the BMP280 driver * * Inspired by the older BMP085 driver drivers/misc/bmp085-spi.c */ #include <linux/module.h> #include <linux/spi/spi.h> #include <linux/err.h> #include <linux/regmap.h> #include "bmp280.h" static int bmp280_regmap_spi_write(void *context, const void *data, size_t count) { struct device *dev = context; struct spi_device *spi = to_spi_device(dev); u8 buf[2]; memcpy(buf, data, 2); /* * The SPI register address (= full register address without bit 7) and * the write command (bit7 = RW = '0') */ buf[0] &= ~0x80; return spi_write_then_read(spi, buf, 2, NULL, 0); } static int bmp280_regmap_spi_read(void *context, const void *reg, size_t reg_size, void *val, size_t val_size) { struct device *dev = context; struct spi_device *spi = to_spi_device(dev); return spi_write_then_read(spi, reg, reg_size, val, val_size); } static struct regmap_bus bmp280_regmap_bus = { .write = bmp280_regmap_spi_write, .read = bmp280_regmap_spi_read, .reg_format_endian_default = REGMAP_ENDIAN_BIG, .val_format_endian_default = REGMAP_ENDIAN_BIG, }; static int bmp280_spi_probe(struct spi_device *spi) { const struct spi_device_id *id = spi_get_device_id(spi); struct regmap *regmap; const struct regmap_config *regmap_config; int ret; spi->bits_per_word = 8; ret = spi_setup(spi); if (ret < 0) { dev_err(&spi->dev, "spi_setup failed!\n"); return ret; } switch (id->driver_data) { case BMP180_CHIP_ID: regmap_config = &bmp180_regmap_config; break; case BMP280_CHIP_ID: case BME280_CHIP_ID: regmap_config = &bmp280_regmap_config; break; default: return -EINVAL; } regmap = devm_regmap_init(&spi->dev, &bmp280_regmap_bus, &spi->dev, regmap_config); if (IS_ERR(regmap)) { dev_err(&spi->dev, "failed to allocate register map\n"); return PTR_ERR(regmap); } return bmp280_common_probe(&spi->dev, regmap, id->driver_data, id->name, spi->irq); } static const struct of_device_id bmp280_of_spi_match[] = { { .compatible = "bosch,bmp085", }, { .compatible = "bosch,bmp180", }, { .compatible = "bosch,bmp181", }, { .compatible = "bosch,bmp280", }, { .compatible = "bosch,bme280", }, { }, }; MODULE_DEVICE_TABLE(of, bmp280_of_spi_match); static const struct spi_device_id bmp280_spi_id[] = { { "bmp180", BMP180_CHIP_ID }, { "bmp181", BMP180_CHIP_ID }, { "bmp280", BMP280_CHIP_ID }, { "bme280", BME280_CHIP_ID }, { } }; MODULE_DEVICE_TABLE(spi, bmp280_spi_id); static struct spi_driver bmp280_spi_driver = { .driver = { .name = "bmp280", .of_match_table = bmp280_of_spi_match, .pm = &bmp280_dev_pm_ops, }, .id_table = bmp280_spi_id, .probe = bmp280_spi_probe, }; module_spi_driver(bmp280_spi_driver); MODULE_DESCRIPTION("BMP280 SPI bus driver"); MODULE_LICENSE("GPL"); |