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 = MC13XXX_ID_MC13892,
  28         }, {
  29                 /* sentinel */
  30         }
  31 };
  32 MODULE_DEVICE_TABLE(i2c, mc13xxx_i2c_device_id);
  33
  34 static const struct of_device_id mc13xxx_dt_ids[] = {
  35         {
  36                 .compatible = "fsl,mc13892",
  37                 .data = (void *) &mc13xxx_i2c_device_id[0],
  38         }, {
  39                 /* sentinel */
  40         }
  41 };
  42 MODULE_DEVICE_TABLE(of, mc13xxx_dt_ids);
  43
  44 static struct regmap_config mc13xxx_regmap_i2c_config = {
  45         .reg_bits = 8,
  46         .val_bits = 24,
  47
  48         .max_register = MC13XXX_NUMREGS,
  49
  50         .cache_type = REGCACHE_NONE,
  51 };
  52
  53 static int mc13xxx_i2c_probe(struct i2c_client *client,
  54                 const struct i2c_device_id *id)
  55 {
  56         const struct of_device_id *of_id;
  57         struct i2c_driver *idrv = to_i2c_driver(client->dev.driver);
  58         struct mc13xxx *mc13xxx;
  59         struct mc13xxx_platform_data *pdata = dev_get_platdata(&client->dev);
  60         int ret;
  61
  62         of_id = of_match_device(mc13xxx_dt_ids, &client->dev);
  63         if (of_id)
  64                 idrv->id_table = (const struct i2c_device_id*) of_id->data;
  65
  66         mc13xxx = kzalloc(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 = regmap_init_i2c(client, &mc13xxx_regmap_i2c_config);
  76         if (IS_ERR(mc13xxx->regmap)) {
  77                 ret = PTR_ERR(mc13xxx->regmap);
  78                 dev_err(mc13xxx->dev, "Failed to initialize register map: %d\n",
  79                                 ret);
  80                 dev_set_drvdata(&client->dev, NULL);
  81                 kfree(mc13xxx);
  82                 return ret;
  83         }
  84
  85         ret = mc13xxx_common_init(mc13xxx, pdata, client->irq);
  86
  87         if (ret == 0 && (id->driver_data != mc13xxx->ictype))
  88                 dev_warn(mc13xxx->dev,
  89                                 "device id doesn't match auto detection!\n");
  90
  91         return ret;
  92 }
  93
  94 static int __devexit mc13xxx_i2c_remove(struct i2c_client *client)
  95 {
  96         struct mc13xxx *mc13xxx = dev_get_drvdata(&client->dev);
  97
  98         mc13xxx_common_cleanup(mc13xxx);
  99
 100         return 0;
 101 }
 102
 103 static struct i2c_driver mc13xxx_i2c_driver = {
 104         .id_table = mc13xxx_i2c_device_id,
 105         .driver = {
 106                 .owner = THIS_MODULE,
 107                 .name = "mc13xxx",
 108                 .of_match_table = mc13xxx_dt_ids,
 109         },
 110         .probe = mc13xxx_i2c_probe,
 111         .remove = __devexit_p(mc13xxx_i2c_remove),
 112 };
 113
 114 static int __init mc13xxx_i2c_init(void)
 115 {
 116         return i2c_add_driver(&mc13xxx_i2c_driver);
 117 }
 118 subsys_initcall(mc13xxx_i2c_init);
 119
 120 static void __exit mc13xxx_i2c_exit(void)
 121 {
 122         i2c_del_driver(&mc13xxx_i2c_driver);
 123 }
 124 module_exit(mc13xxx_i2c_exit);
 125
 126 MODULE_DESCRIPTION("i2c driver for Freescale MC13XXX PMIC");
 127 MODULE_AUTHOR("Marc Reilly <marc@cpdesign.com.au");
 128 MODULE_LICENSE("GPL v2");