1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * MPRLS0025PA - Honeywell MicroPressure MPR series SPI sensor driver 4 * 5 * Copyright (c) 2024 Petre Rodan <petre.rodan@subdimension.ro> 6 * 7 * Data sheet: 8 * 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 9 */ 10 11 #include <linux/device.h> 12 #include <linux/errno.h> 13 #include <linux/mod_devicetable.h> 14 #include <linux/module.h> 15 #include <linux/spi/spi.h> 16 #include <linux/stddef.h> 17 #include <linux/types.h> 18 19 #include "mprls0025pa.h" 20 21 struct mpr_spi_buf { 22 u8 tx[MPR_MEASUREMENT_RD_SIZE] __aligned(IIO_DMA_MINALIGN); 23 }; 24 25 static int mpr_spi_init(struct device *dev) 26 { 27 struct spi_device *spi = to_spi_device(dev); 28 struct mpr_spi_buf *buf; 29 30 buf = devm_kzalloc(dev, sizeof(*buf), GFP_KERNEL); 31 if (!buf) 32 return -ENOMEM; 33 34 spi_set_drvdata(spi, buf); 35 36 return 0; 37 } 38 39 static int mpr_spi_xfer(struct mpr_data *data, const u8 cmd, const u8 pkt_len) 40 { 41 struct spi_device *spi = to_spi_device(data->dev); 42 struct mpr_spi_buf *buf = spi_get_drvdata(spi); 43 struct spi_transfer xfer; 44 45 if (pkt_len > MPR_MEASUREMENT_RD_SIZE) 46 return -EOVERFLOW; 47 48 buf->tx[0] = cmd; 49 xfer.tx_buf = buf->tx; 50 xfer.rx_buf = data->buffer; 51 xfer.len = pkt_len; 52 53 return spi_sync_transfer(spi, &xfer, 1); 54 } 55 56 static const struct mpr_ops mpr_spi_ops = { 57 .init = mpr_spi_init, 58 .read = mpr_spi_xfer, 59 .write = mpr_spi_xfer, 60 }; 61 62 static int mpr_spi_probe(struct spi_device *spi) 63 { 64 return mpr_common_probe(&spi->dev, &mpr_spi_ops, spi->irq); 65 } 66 67 static const struct of_device_id mpr_spi_match[] = { 68 { .compatible = "honeywell,mprls0025pa" }, 69 {} 70 }; 71 MODULE_DEVICE_TABLE(of, mpr_spi_match); 72 73 static const struct spi_device_id mpr_spi_id[] = { 74 { "mprls0025pa" }, 75 {} 76 }; 77 MODULE_DEVICE_TABLE(spi, mpr_spi_id); 78 79 static struct spi_driver mpr_spi_driver = { 80 .driver = { 81 .name = "mprls0025pa", 82 .of_match_table = mpr_spi_match, 83 }, 84 .probe = mpr_spi_probe, 85 .id_table = mpr_spi_id, 86 }; 87 module_spi_driver(mpr_spi_driver); 88 89 MODULE_AUTHOR("Petre Rodan <petre.rodan@subdimension.ro>"); 90 MODULE_DESCRIPTION("Honeywell MPR pressure sensor spi driver"); 91 MODULE_LICENSE("GPL"); 92 MODULE_IMPORT_NS(IIO_HONEYWELL_MPRLS0025PA); 93