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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Murata ZPA2326 SPI pressure and temperature sensor driver4 *5 * Copyright (c) 2016 Parrot S.A.6 *7 * Author: Gregor Boirie <gregor.boirie@parrot.com>8 */9 10#include <linux/module.h>11#include <linux/regmap.h>12#include <linux/spi/spi.h>13#include <linux/mod_devicetable.h>14#include "zpa2326.h"15 16/*17 * read_flag_mask:18 * - address bit 7 must be set to request a register read operation19 * - address bit 6 must be set to request register address auto increment20 */21static const struct regmap_config zpa2326_regmap_spi_config = {22 .reg_bits = 8,23 .val_bits = 8,24 .writeable_reg = zpa2326_isreg_writeable,25 .readable_reg = zpa2326_isreg_readable,26 .precious_reg = zpa2326_isreg_precious,27 .max_register = ZPA2326_TEMP_OUT_H_REG,28 .read_flag_mask = BIT(7) | BIT(6),29 .cache_type = REGCACHE_NONE,30};31 32static int zpa2326_probe_spi(struct spi_device *spi)33{34 struct regmap *regmap;35 int err;36 37 regmap = devm_regmap_init_spi(spi, &zpa2326_regmap_spi_config);38 if (IS_ERR(regmap)) {39 dev_err(&spi->dev, "failed to init registers map");40 return PTR_ERR(regmap);41 }42 43 /*44 * Enforce SPI slave settings to prevent from DT misconfiguration.45 *46 * Clock is idle high. Sampling happens on trailing edge, i.e., rising47 * edge. Maximum bus frequency is 1 MHz. Registers are 8 bits wide.48 */49 spi->mode = SPI_MODE_3;50 spi->max_speed_hz = min(spi->max_speed_hz, 1000000U);51 spi->bits_per_word = 8;52 err = spi_setup(spi);53 if (err < 0)54 return err;55 56 return zpa2326_probe(&spi->dev, spi_get_device_id(spi)->name,57 spi->irq, ZPA2326_DEVICE_ID, regmap);58}59 60static void zpa2326_remove_spi(struct spi_device *spi)61{62 zpa2326_remove(&spi->dev);63}64 65static const struct spi_device_id zpa2326_spi_ids[] = {66 { "zpa2326", 0 },67 { },68};69MODULE_DEVICE_TABLE(spi, zpa2326_spi_ids);70 71static const struct of_device_id zpa2326_spi_matches[] = {72 { .compatible = "murata,zpa2326" },73 { }74};75MODULE_DEVICE_TABLE(of, zpa2326_spi_matches);76 77static struct spi_driver zpa2326_spi_driver = {78 .driver = {79 .name = "zpa2326-spi",80 .of_match_table = zpa2326_spi_matches,81 .pm = ZPA2326_PM_OPS,82 },83 .probe = zpa2326_probe_spi,84 .remove = zpa2326_remove_spi,85 .id_table = zpa2326_spi_ids,86};87module_spi_driver(zpa2326_spi_driver);88 89MODULE_AUTHOR("Gregor Boirie <gregor.boirie@parrot.com>");90MODULE_DESCRIPTION("SPI driver for Murata ZPA2326 pressure sensor");91MODULE_LICENSE("GPL v2");92MODULE_IMPORT_NS(IIO_ZPA2326);93