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
 16static 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
 26static 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
 39static 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
 71static 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
 81static 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
 90static int __init ab8500_i2c_init(void)
 91{
 92	return platform_driver_register(&ab8500_i2c_driver);
 93}
 94
 95static void __exit ab8500_i2c_exit(void)
 96{
 97	platform_driver_unregister(&ab8500_i2c_driver);
 98}
 99arch_initcall(ab8500_i2c_init);
100module_exit(ab8500_i2c_exit);
101
102MODULE_AUTHOR("Mattias WALLIN <mattias.wallin@stericsson.com");
103MODULE_DESCRIPTION("AB8500 Core access via PRCMU I2C");
104MODULE_LICENSE("GPL v2");