drivers/mfd/mc13xxx-i2c.c

   1 /*
   2  * Copyright 2009-2010 Creative Product Design
   3  * Marc Reilly marc@cpdesign.com.au
   4  *
   5  * This program is free software; you can redistribute it and/or modify it under
   6  * the terms of the GNU General Public License version 2 as published by the
   7  * Free Software Foundation.
   8  */
   9
  10 #include <linux/slab.h>
  11 #include <linux/module.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/mfd/core.h>
  14 #include <linux/mfd/mc13xxx.h>
  15 #include <linux/of.h>
  16 #include <linux/of_device.h>
  17 #include <linux/of_gpio.h>
  18 #include <linux/i2c.h>
  19 #include <linux/err.h>
  20
  21 #include "mc13xxx.h"
  22
  23 static const struct i2c_device_id mc13xxx_i2c_device_id[] = {
  24         {
  25                 .name = "mc13892",
  26                 .driver_data = (kernel_ulong_t)&mc13xxx_variant_mc13892,
  27         }, {
  28                 .name = "mc34708",
  29                 .driver_data = (kernel_ulong_t)&mc13xxx_variant_mc34708,
  30         }, {
  31                 /* sentinel */
  32         }
  33 };
  34 MODULE_DEVICE_TABLE(i2c, mc13xxx_i2c_device_id);
  35
  36 static const struct of_device_id mc13xxx_dt_ids[] = {
  37         {
  38                 .compatible = "fsl,mc13892",
  39                 .data = &mc13xxx_variant_mc13892,
  40         }, {
  41                 .compatible = "fsl,mc34708",
  42                 .data = &mc13xxx_variant_mc34708,
  43         }, {
  44                 /* sentinel */
  45         }
  46 };
  47 MODULE_DEVICE_TABLE(of, mc13xxx_dt_ids);
  48
  49 static const struct regmap_config mc13xxx_regmap_i2c_config = {
  50         .reg_bits = 8,
  51         .val_bits = 24,
  52
  53         .max_register = MC13XXX_NUMREGS,
  54
  55         .cache_type = REGCACHE_NONE,
  56 };
  57
  58 static int mc13xxx_i2c_probe(struct i2c_client *client,
  59                 const struct i2c_device_id *id)
  60 {
  61         struct mc13xxx *mc13xxx;
  62         int ret;
  63
  64         mc13xxx = devm_kzalloc(&client->dev, sizeof(*mc13xxx), GFP_KERNEL);
  65         if (!mc13xxx)
  66                 return -ENOMEM;
  67
  68         dev_set_drvdata(&client->dev, mc13xxx);
  69
  70         mc13xxx->irq = client->irq;
  71
  72         mc13xxx->regmap = devm_regmap_init_i2c(client,
  73                                                &mc13xxx_regmap_i2c_config);
  74         if (IS_ERR(mc13xxx->regmap)) {
  75                 ret = PTR_ERR(mc13xxx->regmap);
  76                 dev_err(&client->dev, "Failed to initialize regmap: %d\n", ret);
  77                 return ret;
  78         }
  79
  80         if (client->dev.of_node) {
  81                 const struct of_device_id *of_id =
  82                         of_match_device(mc13xxx_dt_ids, &client->dev);
  83                 mc13xxx->variant = of_id->data;
  84         } else {
  85                 mc13xxx->variant = (void *)id->driver_data;
  86         }
  87
  88         return mc13xxx_common_init(&client->dev);
  89 }
  90
  91 static int mc13xxx_i2c_remove(struct i2c_client *client)
  92 {
  93         return mc13xxx_common_exit(&client->dev);
  94 }
  95
  96 static struct i2c_driver mc13xxx_i2c_driver = {
  97         .id_table = mc13xxx_i2c_device_id,
  98         .driver = {
  99                 .name = "mc13xxx",
 100                 .of_match_table = mc13xxx_dt_ids,
 101         },
 102         .probe = mc13xxx_i2c_probe,
 103         .remove = mc13xxx_i2c_remove,
 104 };
 105
 106 static int __init mc13xxx_i2c_init(void)
 107 {
 108         return i2c_add_driver(&mc13xxx_i2c_driver);
 109 }
 110 subsys_initcall(mc13xxx_i2c_init);
 111
 112 static void __exit mc13xxx_i2c_exit(void)
 113 {
 114         i2c_del_driver(&mc13xxx_i2c_driver);
 115 }
 116 module_exit(mc13xxx_i2c_exit);
 117
 118 MODULE_DESCRIPTION("i2c driver for Freescale MC13XXX PMIC");
 119 MODULE_AUTHOR("Marc Reilly <marc@cpdesign.com.au");
 120 MODULE_LICENSE("GPL v2");