drivers/mfd/mc13xxx-i2c.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright 2009-2010 Creative Product Design
   4  * Marc Reilly [email protected]
   5  */
   6
   7 #include <linux/slab.h>
   8 #include <linux/module.h>
   9 #include <linux/platform_device.h>
  10 #include <linux/mfd/core.h>
  11 #include <linux/mfd/mc13xxx.h>
  12 #include <linux/of.h>
  13 #include <linux/of_device.h>
  14 #include <linux/i2c.h>
  15 #include <linux/err.h>
  16
  17 #include "mc13xxx.h"
  18
  19 static const struct i2c_device_id mc13xxx_i2c_device_id[] = {
  20         {
  21                 .name = "mc13892",
  22                 .driver_data = (kernel_ulong_t)&mc13xxx_variant_mc13892,
  23         }, {
  24                 .name = "mc34708",
  25                 .driver_data = (kernel_ulong_t)&mc13xxx_variant_mc34708,
  26         }, {
  27                 /* sentinel */
  28         }
  29 };
  30 MODULE_DEVICE_TABLE(i2c, mc13xxx_i2c_device_id);
  31
  32 static const struct of_device_id mc13xxx_dt_ids[] = {
  33         {
  34                 .compatible = "fsl,mc13892",
  35                 .data = &mc13xxx_variant_mc13892,
  36         }, {
  37                 .compatible = "fsl,mc34708",
  38                 .data = &mc13xxx_variant_mc34708,
  39         }, {
  40                 /* sentinel */
  41         }
  42 };
  43 MODULE_DEVICE_TABLE(of, mc13xxx_dt_ids);
  44
  45 static const struct regmap_config mc13xxx_regmap_i2c_config = {
  46         .reg_bits = 8,
  47         .val_bits = 24,
  48
  49         .max_register = MC13XXX_NUMREGS,
  50
  51         .cache_type = REGCACHE_NONE,
  52 };
  53
  54 static int mc13xxx_i2c_probe(struct i2c_client *client)
  55 {
  56         const struct i2c_device_id *id = i2c_client_get_device_id(client);
  57         struct mc13xxx *mc13xxx;
  58         int ret;
  59
  60         mc13xxx = devm_kzalloc(&client->dev, sizeof(*mc13xxx), GFP_KERNEL);
  61         if (!mc13xxx)
  62                 return -ENOMEM;
  63
  64         dev_set_drvdata(&client->dev, mc13xxx);
  65
  66         mc13xxx->irq = client->irq;
  67
  68         mc13xxx->regmap = devm_regmap_init_i2c(client,
  69                                                &mc13xxx_regmap_i2c_config);
  70         if (IS_ERR(mc13xxx->regmap)) {
  71                 ret = PTR_ERR(mc13xxx->regmap);
  72                 dev_err(&client->dev, "Failed to initialize regmap: %d\n", ret);
  73                 return ret;
  74         }
  75
  76         if (client->dev.of_node) {
  77                 const struct of_device_id *of_id =
  78                         of_match_device(mc13xxx_dt_ids, &client->dev);
  79                 mc13xxx->variant = of_id->data;
  80         } else {
  81                 mc13xxx->variant = (void *)id->driver_data;
  82         }
  83
  84         return mc13xxx_common_init(&client->dev);
  85 }
  86
  87 static void mc13xxx_i2c_remove(struct i2c_client *client)
  88 {
  89         mc13xxx_common_exit(&client->dev);
  90 }
  91
  92 static struct i2c_driver mc13xxx_i2c_driver = {
  93         .id_table = mc13xxx_i2c_device_id,
  94         .driver = {
  95                 .name = "mc13xxx",
  96                 .of_match_table = mc13xxx_dt_ids,
  97         },
  98         .probe = mc13xxx_i2c_probe,
  99         .remove = mc13xxx_i2c_remove,
 100 };
 101
 102 static int __init mc13xxx_i2c_init(void)
 103 {
 104         return i2c_add_driver(&mc13xxx_i2c_driver);
 105 }
 106 subsys_initcall(mc13xxx_i2c_init);
 107
 108 static void __exit mc13xxx_i2c_exit(void)
 109 {
 110         i2c_del_driver(&mc13xxx_i2c_driver);
 111 }
 112 module_exit(mc13xxx_i2c_exit);
 113
 114 MODULE_DESCRIPTION("i2c driver for Freescale MC13XXX PMIC");
 115 MODULE_AUTHOR("Marc Reilly <[email protected]");
 116 MODULE_LICENSE("GPL v2");