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/mutex.h>
  14 #include <linux/mfd/core.h>
  15 #include <linux/mfd/mc13xxx.h>
  16 #include <linux/of.h>
  17 #include <linux/of_device.h>
  18 #include <linux/of_gpio.h>
  19 #include <linux/i2c.h>
  20 #include <linux/err.h>
  21
  22 #include "mc13xxx.h"
  23
  24 static const struct i2c_device_id mc13xxx_i2c_device_id[] = {
  25         {
  26                 .name = "mc13892",
  27                 .driver_data = (kernel_ulong_t)&mc13xxx_variant_mc13892,
  28         }, {
  29                 .name = "mc34708",
  30                 .driver_data = (kernel_ulong_t)&mc13xxx_variant_mc34708,
  31         }, {
  32                 /* sentinel */
  33         }
  34 };
  35 MODULE_DEVICE_TABLE(i2c, mc13xxx_i2c_device_id);
  36
  37 static const struct of_device_id mc13xxx_dt_ids[] = {
  38         {
  39                 .compatible = "fsl,mc13892",
  40                 .data = &mc13xxx_variant_mc13892,
  41         }, {
  42                 .compatible = "fsl,mc34708",
  43                 .data = &mc13xxx_variant_mc34708,
  44         }, {
  45                 /* sentinel */
  46         }
  47 };
  48 MODULE_DEVICE_TABLE(of, mc13xxx_dt_ids);
  49
  50 static struct regmap_config mc13xxx_regmap_i2c_config = {
  51         .reg_bits = 8,
  52         .val_bits = 24,
  53
  54         .max_register = MC13XXX_NUMREGS,
  55
  56         .cache_type = REGCACHE_NONE,
  57 };
  58
  59 static int mc13xxx_i2c_probe(struct i2c_client *client,
  60                 const struct i2c_device_id *id)
  61 {
  62         struct mc13xxx *mc13xxx;
  63         struct mc13xxx_platform_data *pdata = dev_get_platdata(&client->dev);
  64         int ret;
  65
  66         mc13xxx = devm_kzalloc(&client->dev, sizeof(*mc13xxx), GFP_KERNEL);
  67         if (!mc13xxx)
  68                 return -ENOMEM;
  69
  70         dev_set_drvdata(&client->dev, mc13xxx);
  71
  72         mc13xxx->dev = &client->dev;
  73         mutex_init(&mc13xxx->lock);
  74
  75         mc13xxx->regmap = devm_regmap_init_i2c(client,
  76                                                &mc13xxx_regmap_i2c_config);
  77         if (IS_ERR(mc13xxx->regmap)) {
  78                 ret = PTR_ERR(mc13xxx->regmap);
  79                 dev_err(mc13xxx->dev, "Failed to initialize register map: %d\n",
  80                                 ret);
  81                 dev_set_drvdata(&client->dev, NULL);
  82                 return ret;
  83         }
  84
  85         if (client->dev.of_node) {
  86                 const struct of_device_id *of_id =
  87                         of_match_device(mc13xxx_dt_ids, &client->dev);
  88                 mc13xxx->variant = of_id->data;
  89         } else {
  90                 mc13xxx->variant = (void *)id->driver_data;
  91         }
  92
  93         ret = mc13xxx_common_init(mc13xxx, pdata, client->irq);
  94
  95         return ret;
  96 }
  97
  98 static int mc13xxx_i2c_remove(struct i2c_client *client)
  99 {
 100         struct mc13xxx *mc13xxx = dev_get_drvdata(&client->dev);
 101
 102         mc13xxx_common_cleanup(mc13xxx);
 103
 104         return 0;
 105 }
 106
 107 static struct i2c_driver mc13xxx_i2c_driver = {
 108         .id_table = mc13xxx_i2c_device_id,
 109         .driver = {
 110                 .owner = THIS_MODULE,
 111                 .name = "mc13xxx",
 112                 .of_match_table = mc13xxx_dt_ids,
 113         },
 114         .probe = mc13xxx_i2c_probe,
 115         .remove = mc13xxx_i2c_remove,
 116 };
 117
 118 static int __init mc13xxx_i2c_init(void)
 119 {
 120         return i2c_add_driver(&mc13xxx_i2c_driver);
 121 }
 122 subsys_initcall(mc13xxx_i2c_init);
 123
 124 static void __exit mc13xxx_i2c_exit(void)
 125 {
 126         i2c_del_driver(&mc13xxx_i2c_driver);
 127 }
 128 module_exit(mc13xxx_i2c_exit);
 129
 130 MODULE_DESCRIPTION("i2c driver for Freescale MC13XXX PMIC");
 131 MODULE_AUTHOR("Marc Reilly <marc@cpdesign.com.au");
 132 MODULE_LICENSE("GPL v2");