drivers/mfd/mc13xxx-i2c.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright 2009-2010 Creative Product Design
   4  * Marc Reilly marc@cpdesign.com.au
   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/of_gpio.h>
  15 #include <linux/i2c.h>
  16 #include <linux/err.h>
  17
  18 #include "mc13xxx.h"
  19
  20 static const struct i2c_device_id mc13xxx_i2c_device_id[] = {
  21         {
  22                 .name = "mc13892",
  23                 .driver_data = (kernel_ulong_t)&mc13xxx_variant_mc13892,
  24         }, {
  25                 .name = "mc34708",
  26                 .driver_data = (kernel_ulong_t)&mc13xxx_variant_mc34708,
  27         }, {
  28                 /* sentinel */
  29         }
  30 };
  31 MODULE_DEVICE_TABLE(i2c, mc13xxx_i2c_device_id);
  32
  33 static const struct of_device_id mc13xxx_dt_ids[] = {
  34         {
  35                 .compatible = "fsl,mc13892",
  36                 .data = &mc13xxx_variant_mc13892,
  37         }, {
  38                 .compatible = "fsl,mc34708",
  39                 .data = &mc13xxx_variant_mc34708,
  40         }, {
  41                 /* sentinel */
  42         }
  43 };
  44 MODULE_DEVICE_TABLE(of, mc13xxx_dt_ids);
  45
  46 static const struct regmap_config mc13xxx_regmap_i2c_config = {
  47         .reg_bits = 8,
  48         .val_bits = 24,
  49
  50         .max_register = MC13XXX_NUMREGS,
  51
  52         .cache_type = REGCACHE_NONE,
  53 };
  54
  55 static int mc13xxx_i2c_probe(struct i2c_client *client,
  56                 const struct i2c_device_id *id)
  57 {
  58         struct mc13xxx *mc13xxx;
  59         int ret;
  60
  61         mc13xxx = devm_kzalloc(&client->dev, sizeof(*mc13xxx), GFP_KERNEL);
  62         if (!mc13xxx)
  63                 return -ENOMEM;
  64
  65         dev_set_drvdata(&client->dev, mc13xxx);
  66
  67         mc13xxx->irq = client->irq;
  68
  69         mc13xxx->regmap = devm_regmap_init_i2c(client,
  70                                                &mc13xxx_regmap_i2c_config);
  71         if (IS_ERR(mc13xxx->regmap)) {
  72                 ret = PTR_ERR(mc13xxx->regmap);
  73                 dev_err(&client->dev, "Failed to initialize regmap: %d\n", ret);
  74                 return ret;
  75         }
  76
  77         if (client->dev.of_node) {
  78                 const struct of_device_id *of_id =
  79                         of_match_device(mc13xxx_dt_ids, &client->dev);
  80                 mc13xxx->variant = of_id->data;
  81         } else {
  82                 mc13xxx->variant = (void *)id->driver_data;
  83         }
  84
  85         return mc13xxx_common_init(&client->dev);
  86 }
  87
  88 static int mc13xxx_i2c_remove(struct i2c_client *client)
  89 {
  90         mc13xxx_common_exit(&client->dev);
  91         return 0;
  92 }
  93
  94 static struct i2c_driver mc13xxx_i2c_driver = {
  95         .id_table = mc13xxx_i2c_device_id,
  96         .driver = {
  97                 .name = "mc13xxx",
  98                 .of_match_table = mc13xxx_dt_ids,
  99         },
 100         .probe = mc13xxx_i2c_probe,
 101         .remove = mc13xxx_i2c_remove,
 102 };
 103
 104 static int __init mc13xxx_i2c_init(void)
 105 {
 106         return i2c_add_driver(&mc13xxx_i2c_driver);
 107 }
 108 subsys_initcall(mc13xxx_i2c_init);
 109
 110 static void __exit mc13xxx_i2c_exit(void)
 111 {
 112         i2c_del_driver(&mc13xxx_i2c_driver);
 113 }
 114 module_exit(mc13xxx_i2c_exit);
 115
 116 MODULE_DESCRIPTION("i2c driver for Freescale MC13XXX PMIC");
 117 MODULE_AUTHOR("Marc Reilly <marc@cpdesign.com.au");
 118 MODULE_LICENSE("GPL v2");