^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Freescale MPL115A1 pressure/temperature sensor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (c) 2016 Akinobu Mita <akinobu.mita@gmail.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Datasheet: http://www.nxp.com/files/sensors/doc/data_sheet/MPL115A1.pdf
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/spi/spi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include "mpl115.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #define MPL115_SPI_WRITE(address) ((address) << 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #define MPL115_SPI_READ(address) (0x80 | (address) << 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) struct mpl115_spi_buf {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) u8 tx[4];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) u8 rx[4];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) static int mpl115_spi_init(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) struct spi_device *spi = to_spi_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) struct mpl115_spi_buf *buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) buf = devm_kzalloc(dev, sizeof(*buf), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) if (!buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) spi_set_drvdata(spi, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) static int mpl115_spi_read(struct device *dev, u8 address)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) struct spi_device *spi = to_spi_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) struct mpl115_spi_buf *buf = spi_get_drvdata(spi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) struct spi_transfer xfer = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) .tx_buf = buf->tx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) .rx_buf = buf->rx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) .len = 4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) buf->tx[0] = MPL115_SPI_READ(address);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) buf->tx[2] = MPL115_SPI_READ(address + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) ret = spi_sync_transfer(spi, &xfer, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) return (buf->rx[1] << 8) | buf->rx[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) static int mpl115_spi_write(struct device *dev, u8 address, u8 value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) struct spi_device *spi = to_spi_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) struct mpl115_spi_buf *buf = spi_get_drvdata(spi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) struct spi_transfer xfer = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) .tx_buf = buf->tx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) .len = 2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) buf->tx[0] = MPL115_SPI_WRITE(address);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) buf->tx[1] = value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) return spi_sync_transfer(spi, &xfer, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) static const struct mpl115_ops mpl115_spi_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) .init = mpl115_spi_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) .read = mpl115_spi_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) .write = mpl115_spi_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) static int mpl115_spi_probe(struct spi_device *spi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) const struct spi_device_id *id = spi_get_device_id(spi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) return mpl115_probe(&spi->dev, id->name, &mpl115_spi_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) static const struct spi_device_id mpl115_spi_ids[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) { "mpl115", 0 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) MODULE_DEVICE_TABLE(spi, mpl115_spi_ids);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) static struct spi_driver mpl115_spi_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) .name = "mpl115",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) .probe = mpl115_spi_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) .id_table = mpl115_spi_ids,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) module_spi_driver(mpl115_spi_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) MODULE_DESCRIPTION("Freescale MPL115A1 pressure/temperature driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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