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Linux/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 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                 .owner = THIS_MODULE,
100                 .name = "mc13xxx",
101                 .of_match_table = mc13xxx_dt_ids,
102         },
103         .probe = mc13xxx_i2c_probe,
104         .remove = mc13xxx_i2c_remove,
105 };
106 
107 static int __init mc13xxx_i2c_init(void)
108 {
109         return i2c_add_driver(&mc13xxx_i2c_driver);
110 }
111 subsys_initcall(mc13xxx_i2c_init);
112 
113 static void __exit mc13xxx_i2c_exit(void)
114 {
115         i2c_del_driver(&mc13xxx_i2c_driver);
116 }
117 module_exit(mc13xxx_i2c_exit);
118 
119 MODULE_DESCRIPTION("i2c driver for Freescale MC13XXX PMIC");
120 MODULE_AUTHOR("Marc Reilly <marc@cpdesign.com.au");
121 MODULE_LICENSE("GPL v2");
122 

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