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/*
* Murata ZPA2326 I2C pressure and temperature sensor driver
*
* Copyright (c) 2016 Parrot S.A.
*
* Author: Gregor Boirie <gregor.boirie@parrot.com>
*
* 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.
*/
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/i2c.h>
#include <linux/of_device.h>
#include "zpa2326.h"
/*
* read_flag_mask:
* - address bit 7 must be set to request a register read operation
*/
static const struct regmap_config zpa2326_regmap_i2c_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),
.cache_type = REGCACHE_NONE,
};
static unsigned int zpa2326_i2c_hwid(const struct i2c_client *client)
{
#define ZPA2326_SA0(_addr) (_addr & BIT(0))
#define ZPA2326_DEVICE_ID_SA0_SHIFT (1)
/* Identification register bit 1 mirrors device address bit 0. */
return (ZPA2326_DEVICE_ID |
(ZPA2326_SA0(client->addr) << ZPA2326_DEVICE_ID_SA0_SHIFT));
}
static int zpa2326_probe_i2c(struct i2c_client *client,
const struct i2c_device_id *i2c_id)
{
struct regmap *regmap;
regmap = devm_regmap_init_i2c(client, &zpa2326_regmap_i2c_config);
if (IS_ERR(regmap)) {
dev_err(&client->dev, "failed to init registers map");
return PTR_ERR(regmap);
}
return zpa2326_probe(&client->dev, i2c_id->name, client->irq,
zpa2326_i2c_hwid(client), regmap);
}
static int zpa2326_remove_i2c(struct i2c_client *client)
{
zpa2326_remove(&client->dev);
return 0;
}
static const struct i2c_device_id zpa2326_i2c_ids[] = {
{ "zpa2326", 0 },
{ },
};
MODULE_DEVICE_TABLE(i2c, zpa2326_i2c_ids);
#if defined(CONFIG_OF)
static const struct of_device_id zpa2326_i2c_matches[] = {
{ .compatible = "murata,zpa2326" },
{ }
};
MODULE_DEVICE_TABLE(of, zpa2326_i2c_matches);
#endif
static struct i2c_driver zpa2326_i2c_driver = {
.driver = {
.name = "zpa2326-i2c",
.of_match_table = of_match_ptr(zpa2326_i2c_matches),
.pm = ZPA2326_PM_OPS,
},
.probe = zpa2326_probe_i2c,
.remove = zpa2326_remove_i2c,
.id_table = zpa2326_i2c_ids,
};
module_i2c_driver(zpa2326_i2c_driver);
MODULE_AUTHOR("Gregor Boirie <gregor.boirie@parrot.com>");
MODULE_DESCRIPTION("I2C driver for Murata ZPA2326 pressure sensor");
MODULE_LICENSE("GPL v2");
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