drivers/mfd/cs42l43-i2c.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * CS42L43 I2C driver
   4  *
   5  * Copyright (C) 2022-2023 Cirrus Logic, Inc. and
   6  *                         Cirrus Logic International Semiconductor Ltd.
   7  */
   8
   9 #include <linux/err.h>
  10 #include <linux/errno.h>
  11 #include <linux/i2c.h>
  12 #include <linux/mfd/cs42l43-regs.h>
  13 #include <linux/module.h>
  14
  15 #include "cs42l43.h"
  16
  17 static const struct regmap_config cs42l43_i2c_regmap = {
  18         .reg_bits               = 32,
  19         .reg_stride             = 4,
  20         .val_bits               = 32,
  21         .reg_format_endian      = REGMAP_ENDIAN_BIG,
  22         .val_format_endian      = REGMAP_ENDIAN_BIG,
  23
  24         .max_register           = CS42L43_MCU_RAM_MAX,
  25         .readable_reg           = cs42l43_readable_register,
  26         .volatile_reg           = cs42l43_volatile_register,
  27         .precious_reg           = cs42l43_precious_register,
  28
  29         .cache_type             = REGCACHE_MAPLE,
  30         .reg_defaults           = cs42l43_reg_default,
  31         .num_reg_defaults       = ARRAY_SIZE(cs42l43_reg_default),
  32 };
  33
  34 static int cs42l43_i2c_probe(struct i2c_client *i2c)
  35 {
  36         struct cs42l43 *cs42l43;
  37         int ret;
  38
  39         cs42l43 = devm_kzalloc(&i2c->dev, sizeof(*cs42l43), GFP_KERNEL);
  40         if (!cs42l43)
  41                 return -ENOMEM;
  42
  43         cs42l43->dev = &i2c->dev;
  44         cs42l43->irq = i2c->irq;
  45         /* A device on an I2C is always attached by definition. */
  46         cs42l43->attached = true;
  47
  48         cs42l43->regmap = devm_regmap_init_i2c(i2c, &cs42l43_i2c_regmap);
  49         if (IS_ERR(cs42l43->regmap)) {
  50                 ret = PTR_ERR(cs42l43->regmap);
  51                 dev_err(cs42l43->dev, "Failed to allocate regmap: %d\n", ret);
  52                 return ret;
  53         }
  54
  55         return cs42l43_dev_probe(cs42l43);
  56 }
  57
  58 static void cs42l43_i2c_remove(struct i2c_client *i2c)
  59 {
  60         struct cs42l43 *cs42l43 = dev_get_drvdata(&i2c->dev);
  61
  62         cs42l43_dev_remove(cs42l43);
  63 }
  64
  65 #if IS_ENABLED(CONFIG_OF)
  66 static const struct of_device_id cs42l43_of_match[] = {
  67         { .compatible = "cirrus,cs42l43", },
  68         {}
  69 };
  70 MODULE_DEVICE_TABLE(of, cs42l43_of_match);
  71 #endif
  72
  73 #if IS_ENABLED(CONFIG_ACPI)
  74 static const struct acpi_device_id cs42l43_acpi_match[] = {
  75         { "CSC4243", 0 },
  76         {}
  77 };
  78 MODULE_DEVICE_TABLE(acpi, cs42l43_acpi_match);
  79 #endif
  80
  81 static struct i2c_driver cs42l43_i2c_driver = {
  82         .driver = {
  83                 .name                   = "cs42l43",
  84                 .pm                     = pm_ptr(&cs42l43_pm_ops),
  85                 .of_match_table         = of_match_ptr(cs42l43_of_match),
  86                 .acpi_match_table       = ACPI_PTR(cs42l43_acpi_match),
  87         },
  88
  89         .probe          = cs42l43_i2c_probe,
  90         .remove         = cs42l43_i2c_remove,
  91 };
  92 module_i2c_driver(cs42l43_i2c_driver);
  93
  94 MODULE_IMPORT_NS(MFD_CS42L43);
  95
  96 MODULE_DESCRIPTION("CS42L43 I2C Driver");
  97 MODULE_AUTHOR("Charles Keepax <ckeepax@opensource.cirrus.com>");
  98 MODULE_LICENSE("GPL");