162306a36Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0-only 262306a36Sopenharmony_ci/* 362306a36Sopenharmony_ci * Freescale MPL115A1 pressure/temperature sensor 462306a36Sopenharmony_ci * 562306a36Sopenharmony_ci * Copyright (c) 2016 Akinobu Mita <akinobu.mita@gmail.com> 662306a36Sopenharmony_ci * 762306a36Sopenharmony_ci * Datasheet: http://www.nxp.com/files/sensors/doc/data_sheet/MPL115A1.pdf 862306a36Sopenharmony_ci */ 962306a36Sopenharmony_ci 1062306a36Sopenharmony_ci#include <linux/module.h> 1162306a36Sopenharmony_ci#include <linux/spi/spi.h> 1262306a36Sopenharmony_ci 1362306a36Sopenharmony_ci#include "mpl115.h" 1462306a36Sopenharmony_ci 1562306a36Sopenharmony_ci#define MPL115_SPI_WRITE(address) ((address) << 1) 1662306a36Sopenharmony_ci#define MPL115_SPI_READ(address) (0x80 | (address) << 1) 1762306a36Sopenharmony_ci 1862306a36Sopenharmony_cistruct mpl115_spi_buf { 1962306a36Sopenharmony_ci u8 tx[4]; 2062306a36Sopenharmony_ci u8 rx[4]; 2162306a36Sopenharmony_ci}; 2262306a36Sopenharmony_ci 2362306a36Sopenharmony_cistatic int mpl115_spi_init(struct device *dev) 2462306a36Sopenharmony_ci{ 2562306a36Sopenharmony_ci struct spi_device *spi = to_spi_device(dev); 2662306a36Sopenharmony_ci struct mpl115_spi_buf *buf; 2762306a36Sopenharmony_ci 2862306a36Sopenharmony_ci buf = devm_kzalloc(dev, sizeof(*buf), GFP_KERNEL); 2962306a36Sopenharmony_ci if (!buf) 3062306a36Sopenharmony_ci return -ENOMEM; 3162306a36Sopenharmony_ci 3262306a36Sopenharmony_ci spi_set_drvdata(spi, buf); 3362306a36Sopenharmony_ci 3462306a36Sopenharmony_ci return 0; 3562306a36Sopenharmony_ci} 3662306a36Sopenharmony_ci 3762306a36Sopenharmony_cistatic int mpl115_spi_read(struct device *dev, u8 address) 3862306a36Sopenharmony_ci{ 3962306a36Sopenharmony_ci struct spi_device *spi = to_spi_device(dev); 4062306a36Sopenharmony_ci struct mpl115_spi_buf *buf = spi_get_drvdata(spi); 4162306a36Sopenharmony_ci struct spi_transfer xfer = { 4262306a36Sopenharmony_ci .tx_buf = buf->tx, 4362306a36Sopenharmony_ci .rx_buf = buf->rx, 4462306a36Sopenharmony_ci .len = 4, 4562306a36Sopenharmony_ci }; 4662306a36Sopenharmony_ci int ret; 4762306a36Sopenharmony_ci 4862306a36Sopenharmony_ci buf->tx[0] = MPL115_SPI_READ(address); 4962306a36Sopenharmony_ci buf->tx[2] = MPL115_SPI_READ(address + 1); 5062306a36Sopenharmony_ci 5162306a36Sopenharmony_ci ret = spi_sync_transfer(spi, &xfer, 1); 5262306a36Sopenharmony_ci if (ret) 5362306a36Sopenharmony_ci return ret; 5462306a36Sopenharmony_ci 5562306a36Sopenharmony_ci return (buf->rx[1] << 8) | buf->rx[3]; 5662306a36Sopenharmony_ci} 5762306a36Sopenharmony_ci 5862306a36Sopenharmony_cistatic int mpl115_spi_write(struct device *dev, u8 address, u8 value) 5962306a36Sopenharmony_ci{ 6062306a36Sopenharmony_ci struct spi_device *spi = to_spi_device(dev); 6162306a36Sopenharmony_ci struct mpl115_spi_buf *buf = spi_get_drvdata(spi); 6262306a36Sopenharmony_ci struct spi_transfer xfer = { 6362306a36Sopenharmony_ci .tx_buf = buf->tx, 6462306a36Sopenharmony_ci .len = 2, 6562306a36Sopenharmony_ci }; 6662306a36Sopenharmony_ci 6762306a36Sopenharmony_ci buf->tx[0] = MPL115_SPI_WRITE(address); 6862306a36Sopenharmony_ci buf->tx[1] = value; 6962306a36Sopenharmony_ci 7062306a36Sopenharmony_ci return spi_sync_transfer(spi, &xfer, 1); 7162306a36Sopenharmony_ci} 7262306a36Sopenharmony_ci 7362306a36Sopenharmony_cistatic const struct mpl115_ops mpl115_spi_ops = { 7462306a36Sopenharmony_ci .init = mpl115_spi_init, 7562306a36Sopenharmony_ci .read = mpl115_spi_read, 7662306a36Sopenharmony_ci .write = mpl115_spi_write, 7762306a36Sopenharmony_ci}; 7862306a36Sopenharmony_ci 7962306a36Sopenharmony_cistatic int mpl115_spi_probe(struct spi_device *spi) 8062306a36Sopenharmony_ci{ 8162306a36Sopenharmony_ci const struct spi_device_id *id = spi_get_device_id(spi); 8262306a36Sopenharmony_ci 8362306a36Sopenharmony_ci return mpl115_probe(&spi->dev, id->name, &mpl115_spi_ops); 8462306a36Sopenharmony_ci} 8562306a36Sopenharmony_ci 8662306a36Sopenharmony_cistatic const struct spi_device_id mpl115_spi_ids[] = { 8762306a36Sopenharmony_ci { "mpl115", 0 }, 8862306a36Sopenharmony_ci {} 8962306a36Sopenharmony_ci}; 9062306a36Sopenharmony_ciMODULE_DEVICE_TABLE(spi, mpl115_spi_ids); 9162306a36Sopenharmony_ci 9262306a36Sopenharmony_cistatic struct spi_driver mpl115_spi_driver = { 9362306a36Sopenharmony_ci .driver = { 9462306a36Sopenharmony_ci .name = "mpl115", 9562306a36Sopenharmony_ci .pm = pm_ptr(&mpl115_dev_pm_ops), 9662306a36Sopenharmony_ci }, 9762306a36Sopenharmony_ci .probe = mpl115_spi_probe, 9862306a36Sopenharmony_ci .id_table = mpl115_spi_ids, 9962306a36Sopenharmony_ci}; 10062306a36Sopenharmony_cimodule_spi_driver(mpl115_spi_driver); 10162306a36Sopenharmony_ci 10262306a36Sopenharmony_ciMODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>"); 10362306a36Sopenharmony_ciMODULE_DESCRIPTION("Freescale MPL115A1 pressure/temperature driver"); 10462306a36Sopenharmony_ciMODULE_LICENSE("GPL"); 10562306a36Sopenharmony_ciMODULE_IMPORT_NS(IIO_MPL115); 106