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