drivers/mfd/da9055-i2c.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2  /* I2C access for DA9055 PMICs.
   3  *
   4  * Copyright(c) 2012 Dialog Semiconductor Ltd.
   5  *
   6  * Author: David Dajun Chen <dchen@diasemi.com>
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/device.h>
  11 #include <linux/i2c.h>
  12 #include <linux/err.h>
  13 #include <linux/of.h>
  14
  15 #include <linux/mfd/da9055/core.h>
  16
  17 static int da9055_i2c_probe(struct i2c_client *i2c)
  18 {
  19         struct da9055 *da9055;
  20         int ret;
  21
  22         da9055 = devm_kzalloc(&i2c->dev, sizeof(struct da9055), GFP_KERNEL);
  23         if (!da9055)
  24                 return -ENOMEM;
  25
  26         da9055->regmap = devm_regmap_init_i2c(i2c, &da9055_regmap_config);
  27         if (IS_ERR(da9055->regmap)) {
  28                 ret = PTR_ERR(da9055->regmap);
  29                 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
  30                         ret);
  31                 return ret;
  32         }
  33
  34         da9055->dev = &i2c->dev;
  35         da9055->chip_irq = i2c->irq;
  36
  37         i2c_set_clientdata(i2c, da9055);
  38
  39         return da9055_device_init(da9055);
  40 }
  41
  42 static void da9055_i2c_remove(struct i2c_client *i2c)
  43 {
  44         struct da9055 *da9055 = i2c_get_clientdata(i2c);
  45
  46         da9055_device_exit(da9055);
  47 }
  48
  49 /*
  50  * DO NOT change the device Ids. The naming is intentionally specific as both
  51  * the PMIC and CODEC parts of this chip are instantiated separately as I2C
  52  * devices (both have configurable I2C addresses, and are to all intents and
  53  * purposes separate). As a result there are specific DA9055 ids for PMIC
  54  * and CODEC, which must be different to operate together.
  55  */
  56 static const struct i2c_device_id da9055_i2c_id[] = {
  57         { "da9055-pmic" },
  58         { }
  59 };
  60 MODULE_DEVICE_TABLE(i2c, da9055_i2c_id);
  61
  62 static const struct of_device_id da9055_of_match[] = {
  63         { .compatible = "dlg,da9055-pmic", },
  64         { }
  65 };
  66
  67 static struct i2c_driver da9055_i2c_driver = {
  68         .probe = da9055_i2c_probe,
  69         .remove = da9055_i2c_remove,
  70         .id_table = da9055_i2c_id,
  71         .driver = {
  72                 .name = "da9055-pmic",
  73                 .of_match_table = da9055_of_match,
  74         },
  75 };
  76
  77 static int __init da9055_i2c_init(void)
  78 {
  79         int ret;
  80
  81         ret = i2c_add_driver(&da9055_i2c_driver);
  82         if (ret != 0) {
  83                 pr_err("DA9055 I2C registration failed %d\n", ret);
  84                 return ret;
  85         }
  86
  87         return 0;
  88 }
  89 subsys_initcall(da9055_i2c_init);
  90
  91 static void __exit da9055_i2c_exit(void)
  92 {
  93         i2c_del_driver(&da9055_i2c_driver);
  94 }
  95 module_exit(da9055_i2c_exit);
  96
  97 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
  98 MODULE_DESCRIPTION("I2C driver for Dialog DA9055 PMIC");