Merge tag 'char-misc-6.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...

[linux-2.6-microblaze.git] / drivers / iio / pressure / mprls0025pa_spi.c

diff --git a/drivers/iio/pressure/mprls0025pa_spi.c b/drivers/iio/pressure/mprls0025pa_spi.c
new file mode 100644 (file)
index 0000000..3aed14c
--- /dev/null
+++ b/drivers/iio/pressure/mprls0025pa_spi.c
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * MPRLS0025PA - Honeywell MicroPressure MPR series SPI sensor driver
+ *
+ * Copyright (c) 2024 Petre Rodan <petre.rodan@subdimension.ro>
+ *
+ * Data sheet:
+ *  https://prod-edam.honeywell.com/content/dam/honeywell-edam/sps/siot/en-us/products/sensors/pressure-sensors/board-mount-pressure-sensors/micropressure-mpr-series/documents/sps-siot-mpr-series-datasheet-32332628-ciid-172626.pdf
+ */
+
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/spi/spi.h>
+#include <linux/stddef.h>
+#include <linux/types.h>
+
+#include "mprls0025pa.h"
+
+struct mpr_spi_buf {
+       u8 tx[MPR_MEASUREMENT_RD_SIZE] __aligned(IIO_DMA_MINALIGN);
+};
+
+static int mpr_spi_init(struct device *dev)
+{
+       struct spi_device *spi = to_spi_device(dev);
+       struct mpr_spi_buf *buf;
+
+       buf = devm_kzalloc(dev, sizeof(*buf), GFP_KERNEL);
+       if (!buf)
+               return -ENOMEM;
+
+       spi_set_drvdata(spi, buf);
+
+       return 0;
+}
+
+static int mpr_spi_xfer(struct mpr_data *data, const u8 cmd, const u8 pkt_len)
+{
+       struct spi_device *spi = to_spi_device(data->dev);
+       struct mpr_spi_buf *buf = spi_get_drvdata(spi);
+       struct spi_transfer xfer;
+
+       if (pkt_len > MPR_MEASUREMENT_RD_SIZE)
+               return -EOVERFLOW;
+
+       buf->tx[0] = cmd;
+       xfer.tx_buf = buf->tx;
+       xfer.rx_buf = data->buffer;
+       xfer.len = pkt_len;
+
+       return spi_sync_transfer(spi, &xfer, 1);
+}
+
+static const struct mpr_ops mpr_spi_ops = {
+       .init = mpr_spi_init,
+       .read = mpr_spi_xfer,
+       .write = mpr_spi_xfer,
+};
+
+static int mpr_spi_probe(struct spi_device *spi)
+{
+       return mpr_common_probe(&spi->dev, &mpr_spi_ops, spi->irq);
+}
+
+static const struct of_device_id mpr_spi_match[] = {
+       { .compatible = "honeywell,mprls0025pa" },
+       {}
+};
+MODULE_DEVICE_TABLE(of, mpr_spi_match);
+
+static const struct spi_device_id mpr_spi_id[] = {
+       { "mprls0025pa" },
+       {}
+};
+MODULE_DEVICE_TABLE(spi, mpr_spi_id);
+
+static struct spi_driver mpr_spi_driver = {
+       .driver = {
+               .name = "mprls0025pa",
+               .of_match_table = mpr_spi_match,
+       },
+       .probe = mpr_spi_probe,
+       .id_table = mpr_spi_id,
+};
+module_spi_driver(mpr_spi_driver);
+
+MODULE_AUTHOR("Petre Rodan <petre.rodan@subdimension.ro>");
+MODULE_DESCRIPTION("Honeywell MPR pressure sensor spi driver");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(IIO_HONEYWELL_MPRLS0025PA);