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 #include <linux/mfd/db8500-prcmu.h>
  15
  16 static int ab8500_i2c_write(struct ab8500 *ab8500, u16 addr, u8 data)
  17 {
  18         int ret;
  19
  20         ret = prcmu_abb_write((u8)(addr >> 8), (u8)(addr & 0xFF), &data, 1);
  21         if (ret < 0)
  22                 dev_err(ab8500->dev, "prcmu i2c error %d\n", ret);
  23         return ret;
  24 }
  25
  26 static int ab8500_i2c_read(struct ab8500 *ab8500, u16 addr)
  27 {
  28         int ret;
  29         u8 data;
  30
  31         ret = prcmu_abb_read((u8)(addr >> 8), (u8)(addr & 0xFF), &data, 1);
  32         if (ret < 0) {
  33                 dev_err(ab8500->dev, "prcmu i2c error %d\n", ret);
  34                 return ret;
  35         }
  36         return (int)data;
  37 }
  38
  39 static int __devinit ab8500_i2c_probe(struct platform_device *plf)
  40 {
  41         struct ab8500 *ab8500;
  42         struct resource *resource;
  43         int ret;
  44
  45         ab8500 = kzalloc(sizeof *ab8500, GFP_KERNEL);
  46         if (!ab8500)
  47                 return -ENOMEM;
  48
  49         ab8500->dev = &plf->dev;
  50
  51         resource = platform_get_resource(plf, IORESOURCE_IRQ, 0);
  52         if (!resource) {
  53                 kfree(ab8500);
  54                 return -ENODEV;
  55         }
  56
  57         ab8500->irq = resource->start;
  58
  59         ab8500->read = ab8500_i2c_read;
  60         ab8500->write = ab8500_i2c_write;
  61
  62         platform_set_drvdata(plf, ab8500);
  63
  64         ret = ab8500_init(ab8500);
  65         if (ret)
  66                 kfree(ab8500);
  67
  68         return ret;
  69 }
  70
  71 static int __devexit ab8500_i2c_remove(struct platform_device *plf)
  72 {
  73         struct ab8500 *ab8500 = platform_get_drvdata(plf);
  74
  75         ab8500_exit(ab8500);
  76         kfree(ab8500);
  77
  78         return 0;
  79 }
  80
  81 static struct platform_driver ab8500_i2c_driver = {
  82         .driver = {
  83                 .name = "ab8500-i2c",
  84                 .owner = THIS_MODULE,
  85         },
  86         .probe  = ab8500_i2c_probe,
  87         .remove = __devexit_p(ab8500_i2c_remove)
  88 };
  89
  90 static int __init ab8500_i2c_init(void)
  91 {
  92         return platform_driver_register(&ab8500_i2c_driver);
  93 }
  94
  95 static void __exit ab8500_i2c_exit(void)
  96 {
  97         platform_driver_unregister(&ab8500_i2c_driver);
  98 }
  99 arch_initcall(ab8500_i2c_init);
 100 module_exit(ab8500_i2c_exit);
 101
 102 MODULE_AUTHOR("Mattias WALLIN <mattias.wallin@stericsson.com");
 103 MODULE_DESCRIPTION("AB8500 Core access via PRCMU I2C");
 104 MODULE_LICENSE("GPL v2");