// SPDX-License-Identifier: GPL-2.0-only /* * Murata ZPA2326 SPI pressure and temperature sensor driver * * Copyright (c) 2016 Parrot S.A. * * Author: Gregor Boirie <gregor.boirie@parrot.com> */ #include <linux/module.h> #include <linux/regmap.h> #include <linux/spi/spi.h> #include <linux/mod_devicetable.h> #include "zpa2326.h" /* * read_flag_mask: * - address bit 7 must be set to request a register read operation * - address bit 6 must be set to request register address auto increment */ static const struct regmap_config zpa2326_regmap_spi_config = { .reg_bits = 8, .val_bits = 8, .writeable_reg = zpa2326_isreg_writeable, .readable_reg = zpa2326_isreg_readable, .precious_reg = zpa2326_isreg_precious, .max_register = ZPA2326_TEMP_OUT_H_REG, .read_flag_mask = BIT(7) | BIT(6), .cache_type = REGCACHE_NONE, }; static int zpa2326_probe_spi(struct spi_device *spi) { struct regmap *regmap; int err; regmap = devm_regmap_init_spi(spi, &zpa2326_regmap_spi_config); if (IS_ERR(regmap)) { dev_err(&spi->dev, "failed to init registers map"); return PTR_ERR(regmap); } /* * Enforce SPI slave settings to prevent from DT misconfiguration. * * Clock is idle high. Sampling happens on trailing edge, i.e., rising * edge. Maximum bus frequency is 1 MHz. Registers are 8 bits wide. */ spi->mode = SPI_MODE_3; spi->max_speed_hz = min(spi->max_speed_hz, 1000000U); spi->bits_per_word = 8; err = spi_setup(spi); if (err < 0) return err; return zpa2326_probe(&spi->dev, spi_get_device_id(spi)->name, spi->irq, ZPA2326_DEVICE_ID, regmap); } static int zpa2326_remove_spi(struct spi_device *spi) { zpa2326_remove(&spi->dev); return 0; } static const struct spi_device_id zpa2326_spi_ids[] = { { "zpa2326", 0 }, { }, }; MODULE_DEVICE_TABLE(spi, zpa2326_spi_ids); static const struct of_device_id zpa2326_spi_matches[] = { { .compatible = "murata,zpa2326" }, { } }; MODULE_DEVICE_TABLE(of, zpa2326_spi_matches); static struct spi_driver zpa2326_spi_driver = { .driver = { .name = "zpa2326-spi", .of_match_table = zpa2326_spi_matches, .pm = ZPA2326_PM_OPS, }, .probe = zpa2326_probe_spi, .remove = zpa2326_remove_spi, .id_table = zpa2326_spi_ids, }; module_spi_driver(zpa2326_spi_driver); MODULE_AUTHOR("Gregor Boirie <gregor.boirie@parrot.com>"); MODULE_DESCRIPTION("SPI driver for Murata ZPA2326 pressure sensor"); MODULE_LICENSE("GPL v2");