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/abx500/ab8500.h>
  14 #include <linux/mfd/dbx500-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_write_masked(struct ab8500 *ab8500, u16 addr, u8 mask,
  27         u8 data)
  28 {
  29         int ret;
  30
  31         ret = prcmu_abb_write_masked((u8)(addr >> 8), (u8)(addr & 0xFF), &data,
  32                 &mask, 1);
  33         if (ret < 0)
  34                 dev_err(ab8500->dev, "prcmu i2c error %d\n", ret);
  35         return ret;
  36 }
  37
  38 static int ab8500_i2c_read(struct ab8500 *ab8500, u16 addr)
  39 {
  40         int ret;
  41         u8 data;
  42
  43         ret = prcmu_abb_read((u8)(addr >> 8), (u8)(addr & 0xFF), &data, 1);
  44         if (ret < 0) {
  45                 dev_err(ab8500->dev, "prcmu i2c error %d\n", ret);
  46                 return ret;
  47         }
  48         return (int)data;
  49 }
  50
  51 static int __devinit ab8500_i2c_probe(struct platform_device *plf)
  52 {
  53         const struct platform_device_id *platid = platform_get_device_id(plf);
  54         struct ab8500 *ab8500;
  55         struct resource *resource;
  56         int ret;
  57
  58         ab8500 = kzalloc(sizeof *ab8500, GFP_KERNEL);
  59         if (!ab8500)
  60                 return -ENOMEM;
  61
  62         ab8500->dev = &plf->dev;
  63
  64         resource = platform_get_resource(plf, IORESOURCE_IRQ, 0);
  65         if (!resource) {
  66                 kfree(ab8500);
  67                 return -ENODEV;
  68         }
  69
  70         ab8500->irq = resource->start;
  71
  72         ab8500->read = ab8500_i2c_read;
  73         ab8500->write = ab8500_i2c_write;
  74         ab8500->write_masked = ab8500_i2c_write_masked;
  75
  76         platform_set_drvdata(plf, ab8500);
  77
  78         ret = ab8500_init(ab8500, platid->driver_data);
  79         if (ret)
  80                 kfree(ab8500);
  81
  82
  83         return ret;
  84 }
  85
  86 static int __devexit ab8500_i2c_remove(struct platform_device *plf)
  87 {
  88         struct ab8500 *ab8500 = platform_get_drvdata(plf);
  89
  90         ab8500_exit(ab8500);
  91         kfree(ab8500);
  92
  93         return 0;
  94 }
  95
  96 static const struct platform_device_id ab8500_id[] = {
  97         { "ab8500-i2c", AB8500_VERSION_AB8500 },
  98         { "ab8505-i2c", AB8500_VERSION_AB8505 },
  99         { "ab9540-i2c", AB8500_VERSION_AB9540 },
 100         { "ab8540-i2c", AB8500_VERSION_AB8540 },
 101         { }
 102 };
 103
 104 static struct platform_driver ab8500_i2c_driver = {
 105         .driver = {
 106                 .name = "ab8500-i2c",
 107                 .owner = THIS_MODULE,
 108         },
 109         .probe  = ab8500_i2c_probe,
 110         .remove = __devexit_p(ab8500_i2c_remove),
 111         .id_table = ab8500_id,
 112 };
 113
 114 static int __init ab8500_i2c_init(void)
 115 {
 116         return platform_driver_register(&ab8500_i2c_driver);
 117 }
 118
 119 static void __exit ab8500_i2c_exit(void)
 120 {
 121         platform_driver_unregister(&ab8500_i2c_driver);
 122 }
 123 arch_initcall(ab8500_i2c_init);
 124 module_exit(ab8500_i2c_exit);
 125
 126 MODULE_AUTHOR("Mattias WALLIN <mattias.wallin@stericsson.com");
 127 MODULE_DESCRIPTION("AB8500 Core access via PRCMU I2C");
 128 MODULE_LICENSE("GPL v2");