93 lines
2.4 KiB
C
93 lines
2.4 KiB
C
|
// 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 void zpa2326_remove_spi(struct spi_device *spi)
|
||
|
|
{
|
||
|
|
zpa2326_remove(&spi->dev);
|
||
|
|
}
|
||
|
|
|
||
|
|
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");
|
||
|
|
MODULE_IMPORT_NS(IIO_ZPA2326);
|