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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/iio/pressure/bmp280-spi.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/iio/pressure/bmp280-spi.c')
-rw-r--r--drivers/iio/pressure/bmp280-spi.c117
1 files changed, 117 insertions, 0 deletions
diff --git a/drivers/iio/pressure/bmp280-spi.c b/drivers/iio/pressure/bmp280-spi.c
new file mode 100644
index 0000000000..1dff9bb7c4
--- /dev/null
+++ b/drivers/iio/pressure/bmp280-spi.c
@@ -0,0 +1,117 @@
+// 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);
+ const struct bmp280_chip_info *chip_info;
+ 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 = device_get_match_data(&spi->dev);
+ if (!chip_info)
+ chip_info = (const struct bmp280_chip_info *) id->driver_data;
+
+ regmap = devm_regmap_init(&spi->dev,
+ &bmp280_regmap_bus,
+ &spi->dev,
+ chip_info->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,
+ chip_info,
+ id->name,
+ spi->irq);
+}
+
+static const struct of_device_id bmp280_of_spi_match[] = {
+ { .compatible = "bosch,bmp085", .data = &bmp180_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,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[] = {
+ { "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 },
+ { "bmp380", (kernel_ulong_t)&bmp380_chip_info },
+ { "bmp580", (kernel_ulong_t)&bmp580_chip_info },
+ { }
+};
+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 = pm_ptr(&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");
+MODULE_IMPORT_NS(IIO_BMP280);