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 #include <linux/of_device.h>
  15
  16 #include <linux/mfd/da9055/core.h>
  17
  18 static int da9055_i2c_probe(struct i2c_client *i2c,
  19                                       const struct i2c_device_id *id)
  20 {
  21         struct da9055 *da9055;
  22         int ret;
  23
  24         da9055 = devm_kzalloc(&i2c->dev, sizeof(struct da9055), GFP_KERNEL);
  25         if (!da9055)
  26                 return -ENOMEM;
  27
  28         da9055->regmap = devm_regmap_init_i2c(i2c, &da9055_regmap_config);
  29         if (IS_ERR(da9055->regmap)) {
  30                 ret = PTR_ERR(da9055->regmap);
  31                 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
  32                         ret);
  33                 return ret;
  34         }
  35
  36         da9055->dev = &i2c->dev;
  37         da9055->chip_irq = i2c->irq;
  38
  39         i2c_set_clientdata(i2c, da9055);
  40
  41         return da9055_device_init(da9055);
  42 }
  43
  44 static int da9055_i2c_remove(struct i2c_client *i2c)
  45 {
  46         struct da9055 *da9055 = i2c_get_clientdata(i2c);
  47
  48         da9055_device_exit(da9055);
  49
  50         return 0;
  51 }
  52
  53 /*
  54  * DO NOT change the device Ids. The naming is intentionally specific as both
  55  * the PMIC and CODEC parts of this chip are instantiated separately as I2C
  56  * devices (both have configurable I2C addresses, and are to all intents and
  57  * purposes separate). As a result there are specific DA9055 ids for PMIC
  58  * and CODEC, which must be different to operate together.
  59  */
  60 static const struct i2c_device_id da9055_i2c_id[] = {
  61         {"da9055-pmic", 0},
  62         { }
  63 };
  64 MODULE_DEVICE_TABLE(i2c, da9055_i2c_id);
  65
  66 static const struct of_device_id da9055_of_match[] = {
  67         { .compatible = "dlg,da9055-pmic", },
  68         { }
  69 };
  70
  71 static struct i2c_driver da9055_i2c_driver = {
  72         .probe = da9055_i2c_probe,
  73         .remove = da9055_i2c_remove,
  74         .id_table = da9055_i2c_id,
  75         .driver = {
  76                 .name = "da9055-pmic",
  77                 .of_match_table = of_match_ptr(da9055_of_match),
  78         },
  79 };
  80
  81 static int __init da9055_i2c_init(void)
  82 {
  83         int ret;
  84
  85         ret = i2c_add_driver(&da9055_i2c_driver);
  86         if (ret != 0) {
  87                 pr_err("DA9055 I2C registration failed %d\n", ret);
  88                 return ret;
  89         }
  90
  91         return 0;
  92 }
  93 subsys_initcall(da9055_i2c_init);
  94
  95 static void __exit da9055_i2c_exit(void)
  96 {
  97         i2c_del_driver(&da9055_i2c_driver);
  98 }
  99 module_exit(da9055_i2c_exit);
 100
 101 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 102 MODULE_DESCRIPTION("I2C driver for Dialog DA9055 PMIC");
 103 MODULE_LICENSE("GPL");