100 lines
2.8 KiB
C
100 lines
2.8 KiB
C
/*
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* Murata ZPA2326 I2C 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/i2c.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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*/
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static const struct regmap_config zpa2326_regmap_i2c_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),
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.cache_type = REGCACHE_NONE,
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};
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static unsigned int zpa2326_i2c_hwid(const struct i2c_client *client)
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{
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#define ZPA2326_SA0(_addr) (_addr & BIT(0))
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#define ZPA2326_DEVICE_ID_SA0_SHIFT (1)
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/* Identification register bit 1 mirrors device address bit 0. */
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return (ZPA2326_DEVICE_ID |
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(ZPA2326_SA0(client->addr) << ZPA2326_DEVICE_ID_SA0_SHIFT));
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}
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static int zpa2326_probe_i2c(struct i2c_client *client,
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const struct i2c_device_id *i2c_id)
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{
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struct regmap *regmap;
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regmap = devm_regmap_init_i2c(client, &zpa2326_regmap_i2c_config);
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if (IS_ERR(regmap)) {
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dev_err(&client->dev, "failed to init registers map");
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return PTR_ERR(regmap);
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}
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return zpa2326_probe(&client->dev, i2c_id->name, client->irq,
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zpa2326_i2c_hwid(client), regmap);
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}
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static int zpa2326_remove_i2c(struct i2c_client *client)
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{
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zpa2326_remove(&client->dev);
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return 0;
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}
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static const struct i2c_device_id zpa2326_i2c_ids[] = {
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{ "zpa2326", 0 },
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{ },
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};
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MODULE_DEVICE_TABLE(i2c, zpa2326_i2c_ids);
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#if defined(CONFIG_OF)
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static const struct of_device_id zpa2326_i2c_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_i2c_matches);
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#endif
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static struct i2c_driver zpa2326_i2c_driver = {
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.driver = {
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.name = "zpa2326-i2c",
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.of_match_table = of_match_ptr(zpa2326_i2c_matches),
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.pm = ZPA2326_PM_OPS,
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},
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.probe = zpa2326_probe_i2c,
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.remove = zpa2326_remove_i2c,
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.id_table = zpa2326_i2c_ids,
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};
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module_i2c_driver(zpa2326_i2c_driver);
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MODULE_AUTHOR("Gregor Boirie <gregor.boirie@parrot.com>");
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MODULE_DESCRIPTION("I2C driver for Murata ZPA2326 pressure sensor");
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MODULE_LICENSE("GPL v2");
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