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         struct mc13xxx *mc13xxx;
  57         struct mc13xxx_platform_data *pdata = dev_get_platdata(&client->dev);
  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->dev = &client->dev;
  67         mutex_init(&mc13xxx->lock);
  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(mc13xxx->dev, "Failed to initialize register map: %d\n",
  74                                 ret);
  75                 dev_set_drvdata(&client->dev, NULL);
  76                 return ret;
  77         }
  78
  79         ret = mc13xxx_common_init(mc13xxx, pdata, client->irq);
  80
  81         if (ret == 0 && (id->driver_data != mc13xxx->ictype))
  82                 dev_warn(mc13xxx->dev,
  83                                 "device id doesn't match auto detection!\n");
  84
  85         return ret;
  86 }
  87
  88 static int __devexit mc13xxx_i2c_remove(struct i2c_client *client)
  89 {
  90         struct mc13xxx *mc13xxx = dev_get_drvdata(&client->dev);
  91
  92         mc13xxx_common_cleanup(mc13xxx);
  93
  94         return 0;
  95 }
  96
  97 static struct i2c_driver mc13xxx_i2c_driver = {
  98         .id_table = mc13xxx_i2c_device_id,
  99         .driver = {
 100                 .owner = THIS_MODULE,
 101                 .name = "mc13xxx",
 102                 .of_match_table = mc13xxx_dt_ids,
 103         },
 104         .probe = mc13xxx_i2c_probe,
 105         .remove = __devexit_p(mc13xxx_i2c_remove),
 106 };
 107
 108 static int __init mc13xxx_i2c_init(void)
 109 {
 110         return i2c_add_driver(&mc13xxx_i2c_driver);
 111 }
 112 subsys_initcall(mc13xxx_i2c_init);
 113
 114 static void __exit mc13xxx_i2c_exit(void)
 115 {
 116         i2c_del_driver(&mc13xxx_i2c_driver);
 117 }
 118 module_exit(mc13xxx_i2c_exit);
 119
 120 MODULE_DESCRIPTION("i2c driver for Freescale MC13XXX PMIC");
 121 MODULE_AUTHOR("Marc Reilly <marc@cpdesign.com.au");
 122 MODULE_LICENSE("GPL v2");