brintos

brintos / linux-shallow public Read only

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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Murata ZPA2326 I2C pressure and temperature sensor driver4 *5 * Copyright (c) 2016 Parrot S.A.6 *7 * Author: Gregor Boirie <gregor.boirie@parrot.com>8 */9 10#include <linux/module.h>11#include <linux/regmap.h>12#include <linux/i2c.h>13#include <linux/mod_devicetable.h>14#include "zpa2326.h"15 16/*17 * read_flag_mask:18 *   - address bit 7 must be set to request a register read operation19 */20static const struct regmap_config zpa2326_regmap_i2c_config = {21	.reg_bits       = 8,22	.val_bits       = 8,23	.writeable_reg  = zpa2326_isreg_writeable,24	.readable_reg   = zpa2326_isreg_readable,25	.precious_reg   = zpa2326_isreg_precious,26	.max_register   = ZPA2326_TEMP_OUT_H_REG,27	.read_flag_mask = BIT(7),28	.cache_type     = REGCACHE_NONE,29};30 31static unsigned int zpa2326_i2c_hwid(const struct i2c_client *client)32{33#define ZPA2326_SA0(_addr)          (_addr & BIT(0))34#define ZPA2326_DEVICE_ID_SA0_SHIFT (1)35 36	/* Identification register bit 1 mirrors device address bit 0. */37	return (ZPA2326_DEVICE_ID |38		(ZPA2326_SA0(client->addr) << ZPA2326_DEVICE_ID_SA0_SHIFT));39}40 41static int zpa2326_probe_i2c(struct i2c_client          *client)42{43	const struct i2c_device_id *i2c_id = i2c_client_get_device_id(client);44	struct regmap *regmap;45 46	regmap = devm_regmap_init_i2c(client, &zpa2326_regmap_i2c_config);47	if (IS_ERR(regmap)) {48		dev_err(&client->dev, "failed to init registers map");49		return PTR_ERR(regmap);50	}51 52	return zpa2326_probe(&client->dev, i2c_id->name, client->irq,53			     zpa2326_i2c_hwid(client), regmap);54}55 56static void zpa2326_remove_i2c(struct i2c_client *client)57{58	zpa2326_remove(&client->dev);59}60 61static const struct i2c_device_id zpa2326_i2c_ids[] = {62	{ "zpa2326" },63	{ }64};65MODULE_DEVICE_TABLE(i2c, zpa2326_i2c_ids);66 67static const struct of_device_id zpa2326_i2c_matches[] = {68	{ .compatible = "murata,zpa2326" },69	{ }70};71MODULE_DEVICE_TABLE(of, zpa2326_i2c_matches);72 73static struct i2c_driver zpa2326_i2c_driver = {74	.driver = {75		.name           = "zpa2326-i2c",76		.of_match_table = zpa2326_i2c_matches,77		.pm             = ZPA2326_PM_OPS,78	},79	.probe = zpa2326_probe_i2c,80	.remove   = zpa2326_remove_i2c,81	.id_table = zpa2326_i2c_ids,82};83module_i2c_driver(zpa2326_i2c_driver);84 85MODULE_AUTHOR("Gregor Boirie <gregor.boirie@parrot.com>");86MODULE_DESCRIPTION("I2C driver for Murata ZPA2326 pressure sensor");87MODULE_LICENSE("GPL v2");88MODULE_IMPORT_NS(IIO_ZPA2326);89