diff options
Diffstat (limited to 'drivers/iio/pressure/bmp280-spi.c')
| -rw-r--r-- | drivers/iio/pressure/bmp280-spi.c | 70 |
1 files changed, 51 insertions, 19 deletions
diff --git a/drivers/iio/pressure/bmp280-spi.c b/drivers/iio/pressure/bmp280-spi.c index 433d6fac83c4..3b90384f17d7 100644 --- a/drivers/iio/pressure/bmp280-spi.c +++ b/drivers/iio/pressure/bmp280-spi.c @@ -4,15 +4,16 @@ * * Inspired by the older BMP085 driver drivers/misc/bmp085-spi.c */ -#include <linux/module.h> -#include <linux/spi/spi.h> +#include <linux/bits.h> #include <linux/err.h> +#include <linux/module.h> #include <linux/regmap.h> +#include <linux/spi/spi.h> #include "bmp280.h" static int bmp280_regmap_spi_write(void *context, const void *data, - size_t count) + size_t count) { struct spi_device *spi = to_spi_device(context); u8 buf[2]; @@ -28,38 +29,68 @@ static int bmp280_regmap_spi_write(void *context, const void *data, } static int bmp280_regmap_spi_read(void *context, const void *reg, - size_t reg_size, void *val, size_t val_size) + size_t reg_size, void *val, size_t val_size) { struct spi_device *spi = to_spi_device(context); return spi_write_then_read(spi, reg, reg_size, val, val_size); } -static struct regmap_bus bmp280_regmap_bus = { +static int bmp380_regmap_spi_read(void *context, const void *reg, + size_t reg_size, void *val, size_t val_size) +{ + struct spi_device *spi = to_spi_device(context); + u8 rx_buf[BME280_BURST_READ_BYTES + 1]; + ssize_t status; + + if (val_size > BME280_BURST_READ_BYTES) + return -EINVAL; + + /* + * According to the BMP3xx datasheets, for a basic SPI read opertion, + * the first byte needs to be dropped and the rest are the requested + * data. + */ + status = spi_write_then_read(spi, reg, 1, rx_buf, val_size + 1); + if (status) + return status; + + memcpy(val, rx_buf + 1, val_size); + + return 0; +} + +static const 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 const struct regmap_bus bmp380_regmap_bus = { + .write = bmp280_regmap_spi_write, + .read = bmp380_regmap_spi_read, + .read_flag_mask = BIT(7), + .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); const struct bmp280_chip_info *chip_info; + struct regmap_bus const *bmp_regmap_bus; struct regmap *regmap; - int ret; - - spi->bits_per_word = 8; - ret = spi_setup(spi); - if (ret < 0) { - dev_err(&spi->dev, "spi_setup failed!\n"); - return ret; - } chip_info = spi_get_device_match_data(spi); + if (chip_info->spi_read_extra_byte) + bmp_regmap_bus = &bmp380_regmap_bus; + else + bmp_regmap_bus = &bmp280_regmap_bus; + regmap = devm_regmap_init(&spi->dev, - &bmp280_regmap_bus, + bmp_regmap_bus, &spi->dev, chip_info->regmap_config); if (IS_ERR(regmap)) { @@ -75,22 +106,23 @@ static int bmp280_spi_probe(struct spi_device *spi) } static const struct of_device_id bmp280_of_spi_match[] = { - { .compatible = "bosch,bmp085", .data = &bmp180_chip_info }, + { .compatible = "bosch,bmp085", .data = &bmp085_chip_info }, { .compatible = "bosch,bmp180", .data = &bmp180_chip_info }, { .compatible = "bosch,bmp181", .data = &bmp180_chip_info }, { .compatible = "bosch,bmp280", .data = &bmp280_chip_info }, - { .compatible = "bosch,bme280", .data = &bmp280_chip_info }, + { .compatible = "bosch,bme280", .data = &bme280_chip_info }, { .compatible = "bosch,bmp380", .data = &bmp380_chip_info }, { .compatible = "bosch,bmp580", .data = &bmp580_chip_info }, - { }, + { } }; MODULE_DEVICE_TABLE(of, bmp280_of_spi_match); static const struct spi_device_id bmp280_spi_id[] = { + { "bmp085", (kernel_ulong_t)&bmp085_chip_info }, { "bmp180", (kernel_ulong_t)&bmp180_chip_info }, { "bmp181", (kernel_ulong_t)&bmp180_chip_info }, { "bmp280", (kernel_ulong_t)&bmp280_chip_info }, - { "bme280", (kernel_ulong_t)&bmp280_chip_info }, + { "bme280", (kernel_ulong_t)&bme280_chip_info }, { "bmp380", (kernel_ulong_t)&bmp380_chip_info }, { "bmp580", (kernel_ulong_t)&bmp580_chip_info }, { } @@ -110,4 +142,4 @@ module_spi_driver(bmp280_spi_driver); MODULE_DESCRIPTION("BMP280 SPI bus driver"); MODULE_LICENSE("GPL"); -MODULE_IMPORT_NS(IIO_BMP280); +MODULE_IMPORT_NS("IIO_BMP280"); |