drivers/mfd/ab8500-i2c.c

   1 /*
   2  * Copyright (C) ST-Ericsson SA 2010
   3  * Author: Mattias Wallin <mattias.wallin@stericsson.com> for ST-Ericsson.
   4  * License Terms: GNU General Public License v2
   5  * This file was based on drivers/mfd/ab8500-spi.c
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/slab.h>
  10 #include <linux/init.h>
  11 #include <linux/module.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/mfd/ab8500.h>
  14
  15 #include <mach/prcmu.h>
  16
  17 static int ab8500_i2c_write(struct ab8500 *ab8500, u16 addr, u8 data)
  18 {
  19         int ret;
  20
  21         ret = prcmu_abb_write((u8)(addr >> 8), (u8)(addr & 0xFF), &data, 1);
  22         if (ret < 0)
  23                 dev_err(ab8500->dev, "prcmu i2c error %d\n", ret);
  24         return ret;
  25 }
  26
  27 static int ab8500_i2c_read(struct ab8500 *ab8500, u16 addr)
  28 {
  29         int ret;
  30         u8 data;
  31
  32         ret = prcmu_abb_read((u8)(addr >> 8), (u8)(addr & 0xFF), &data, 1);
  33         if (ret < 0) {
  34                 dev_err(ab8500->dev, "prcmu i2c error %d\n", ret);
  35                 return ret;
  36         }
  37         return (int)data;
  38 }
  39
  40 static int __devinit ab8500_i2c_probe(struct platform_device *plf)
  41 {
  42         struct ab8500 *ab8500;
  43         struct resource *resource;
  44         int ret;
  45
  46         ab8500 = kzalloc(sizeof *ab8500, GFP_KERNEL);
  47         if (!ab8500)
  48                 return -ENOMEM;
  49
  50         ab8500->dev = &plf->dev;
  51
  52         resource = platform_get_resource(plf, IORESOURCE_IRQ, 0);
  53         if (!resource) {
  54                 kfree(ab8500);
  55                 return -ENODEV;
  56         }
  57
  58         ab8500->irq = resource->start;
  59
  60         ab8500->read = ab8500_i2c_read;
  61         ab8500->write = ab8500_i2c_write;
  62
  63         platform_set_drvdata(plf, ab8500);
  64
  65         ret = ab8500_init(ab8500);
  66         if (ret)
  67                 kfree(ab8500);
  68
  69         return ret;
  70 }
  71
  72 static int __devexit ab8500_i2c_remove(struct platform_device *plf)
  73 {
  74         struct ab8500 *ab8500 = platform_get_drvdata(plf);
  75
  76         ab8500_exit(ab8500);
  77         kfree(ab8500);
  78
  79         return 0;
  80 }
  81
  82 static struct platform_driver ab8500_i2c_driver = {
  83         .driver = {
  84                 .name = "ab8500-i2c",
  85                 .owner = THIS_MODULE,
  86         },
  87         .probe  = ab8500_i2c_probe,
  88         .remove = __devexit_p(ab8500_i2c_remove)
  89 };
  90
  91 static int __init ab8500_i2c_init(void)
  92 {
  93         return platform_driver_register(&ab8500_i2c_driver);
  94 }
  95
  96 static void __exit ab8500_i2c_exit(void)
  97 {
  98         platform_driver_unregister(&ab8500_i2c_driver);
  99 }
 100 arch_initcall(ab8500_i2c_init);
 101 module_exit(ab8500_i2c_exit);
 102
 103 MODULE_AUTHOR("Mattias WALLIN <mattias.wallin@stericsson.com");
 104 MODULE_DESCRIPTION("AB8500 Core access via PRCMU I2C");
 105 MODULE_LICENSE("GPL v2");