104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
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/*
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* Murata ZPA2326 SPI pressure and temperature sensor driver
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*
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* Copyright (c) 2016 Parrot S.A.
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*
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* Author: Gregor Boirie <gregor.boirie@parrot.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <linux/spi/spi.h>
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#include <linux/of_device.h>
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#include "zpa2326.h"
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/*
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* read_flag_mask:
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* - address bit 7 must be set to request a register read operation
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* - address bit 6 must be set to request register address auto increment
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*/
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static const struct regmap_config zpa2326_regmap_spi_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.writeable_reg = zpa2326_isreg_writeable,
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.readable_reg = zpa2326_isreg_readable,
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.precious_reg = zpa2326_isreg_precious,
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.max_register = ZPA2326_TEMP_OUT_H_REG,
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.read_flag_mask = BIT(7) | BIT(6),
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.cache_type = REGCACHE_NONE,
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};
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static int zpa2326_probe_spi(struct spi_device *spi)
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{
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struct regmap *regmap;
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int err;
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regmap = devm_regmap_init_spi(spi, &zpa2326_regmap_spi_config);
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if (IS_ERR(regmap)) {
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dev_err(&spi->dev, "failed to init registers map");
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return PTR_ERR(regmap);
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}
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/*
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* Enforce SPI slave settings to prevent from DT misconfiguration.
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*
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* Clock is idle high. Sampling happens on trailing edge, i.e., rising
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* edge. Maximum bus frequency is 1 MHz. Registers are 8 bits wide.
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*/
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spi->mode = SPI_MODE_3;
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spi->max_speed_hz = min(spi->max_speed_hz, 1000000U);
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spi->bits_per_word = 8;
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err = spi_setup(spi);
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if (err < 0)
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return err;
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return zpa2326_probe(&spi->dev, spi_get_device_id(spi)->name,
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spi->irq, ZPA2326_DEVICE_ID, regmap);
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}
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static int zpa2326_remove_spi(struct spi_device *spi)
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{
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zpa2326_remove(&spi->dev);
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return 0;
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}
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static const struct spi_device_id zpa2326_spi_ids[] = {
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{ "zpa2326", 0 },
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{ },
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};
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MODULE_DEVICE_TABLE(spi, zpa2326_spi_ids);
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#if defined(CONFIG_OF)
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static const struct of_device_id zpa2326_spi_matches[] = {
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{ .compatible = "murata,zpa2326" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, zpa2326_spi_matches);
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#endif
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static struct spi_driver zpa2326_spi_driver = {
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.driver = {
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.name = "zpa2326-spi",
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.of_match_table = of_match_ptr(zpa2326_spi_matches),
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.pm = ZPA2326_PM_OPS,
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},
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.probe = zpa2326_probe_spi,
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.remove = zpa2326_remove_spi,
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.id_table = zpa2326_spi_ids,
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};
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module_spi_driver(zpa2326_spi_driver);
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MODULE_AUTHOR("Gregor Boirie <gregor.boirie@parrot.com>");
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MODULE_DESCRIPTION("SPI driver for Murata ZPA2326 pressure sensor");
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MODULE_LICENSE("GPL v2");
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