mirror of
https://github.com/torvalds/linux.git
synced 2024-12-02 09:01:34 +00:00
a409d2b639
This prevents use of this driver with ACPI via PRP0001 and is an example of an anti pattern I'm trying to remove from IIO. Hence drop from this driver. Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Cc: Gregor Boirie <gregor.boirie@parrot.com> Link: https://lore.kernel.org/r/20200910173242.621168-21-jic23@kernel.org
94 lines
2.4 KiB
C
94 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 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");
|