LXR linux/drivers/iio/pressure/zpa2326

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Murata ZPA2326 I2C pressure and temperature sensor driver
   4 *
   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 operation
  19 */
  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                             const struct i2c_device_id *i2c_id)
  43{
  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 int zpa2326_remove_i2c(struct i2c_client *client)
  57{
  58        zpa2326_remove(&client->dev);
  59
  60        return 0;
  61}
  62
  63static const struct i2c_device_id zpa2326_i2c_ids[] = {
  64        { "zpa2326", 0 },
  65        { },
  66};
  67MODULE_DEVICE_TABLE(i2c, zpa2326_i2c_ids);
  68
  69static const struct of_device_id zpa2326_i2c_matches[] = {
  70        { .compatible = "murata,zpa2326" },
  71        { }
  72};
  73MODULE_DEVICE_TABLE(of, zpa2326_i2c_matches);
  74
  75static struct i2c_driver zpa2326_i2c_driver = {
  76        .driver = {
  77                .name           = "zpa2326-i2c",
  78                .of_match_table = zpa2326_i2c_matches,
  79                .pm             = ZPA2326_PM_OPS,
  80        },
  81        .probe    = zpa2326_probe_i2c,
  82        .remove   = zpa2326_remove_i2c,
  83        .id_table = zpa2326_i2c_ids,
  84};
  85module_i2c_driver(zpa2326_i2c_driver);
  86
  87MODULE_AUTHOR("Gregor Boirie <gregor.boirie@parrot.com>");
  88MODULE_DESCRIPTION("I2C driver for Murata ZPA2326 pressure sensor");
  89MODULE_LICENSE("GPL v2");
  90