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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 655 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070034.575739538@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
96 lines
2.5 KiB
C
96 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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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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#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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