drivers/iio/pressure/zpa2326_i2c.c

   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/of_device.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  */
  20 static 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
  31 static 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
  41 static 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
  56 static int zpa2326_remove_i2c(struct i2c_client *client)
  57 {
  58         zpa2326_remove(&client->dev);
  59
  60         return 0;
  61 }
  62
  63 static const struct i2c_device_id zpa2326_i2c_ids[] = {
  64         { "zpa2326", 0 },
  65         { },
  66 };
  67 MODULE_DEVICE_TABLE(i2c, zpa2326_i2c_ids);
  68
  69 #if defined(CONFIG_OF)
  70 static const struct of_device_id zpa2326_i2c_matches[] = {
  71         { .compatible = "murata,zpa2326" },
  72         { }
  73 };
  74 MODULE_DEVICE_TABLE(of, zpa2326_i2c_matches);
  75 #endif
  76
  77 static struct i2c_driver zpa2326_i2c_driver = {
  78         .driver = {
  79                 .name           = "zpa2326-i2c",
  80                 .of_match_table = of_match_ptr(zpa2326_i2c_matches),
  81                 .pm             = ZPA2326_PM_OPS,
  82         },
  83         .probe    = zpa2326_probe_i2c,
  84         .remove   = zpa2326_remove_i2c,
  85         .id_table = zpa2326_i2c_ids,
  86 };
  87 module_i2c_driver(zpa2326_i2c_driver);
  88
  89 MODULE_AUTHOR("Gregor Boirie <gregor.boirie@parrot.com>");
  90 MODULE_DESCRIPTION("I2C driver for Murata ZPA2326 pressure sensor");
  91 MODULE_LICENSE("GPL v2");