forked from Minki/linux
39368eda96
This patch adds the choice of accessing the AB8500 registers via prcmu I2C. Access either via SPI or I2C is supported. Signed-off-by: Mattias Wallin <mattias.wallin@stericsson.com> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
106 lines
2.2 KiB
C
106 lines
2.2 KiB
C
/*
|
|
* Copyright (C) ST-Ericsson SA 2010
|
|
* Author: Mattias Wallin <mattias.wallin@stericsson.com> for ST-Ericsson.
|
|
* License Terms: GNU General Public License v2
|
|
* This file was based on drivers/mfd/ab8500-spi.c
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/mfd/ab8500.h>
|
|
|
|
#include <mach/prcmu.h>
|
|
|
|
static int ab8500_i2c_write(struct ab8500 *ab8500, u16 addr, u8 data)
|
|
{
|
|
int ret;
|
|
|
|
ret = prcmu_abb_write((u8)(addr >> 8), (u8)(addr & 0xFF), &data, 1);
|
|
if (ret < 0)
|
|
dev_err(ab8500->dev, "prcmu i2c error %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
static int ab8500_i2c_read(struct ab8500 *ab8500, u16 addr)
|
|
{
|
|
int ret;
|
|
u8 data;
|
|
|
|
ret = prcmu_abb_read((u8)(addr >> 8), (u8)(addr & 0xFF), &data, 1);
|
|
if (ret < 0) {
|
|
dev_err(ab8500->dev, "prcmu i2c error %d\n", ret);
|
|
return ret;
|
|
}
|
|
return (int)data;
|
|
}
|
|
|
|
static int __devinit ab8500_i2c_probe(struct platform_device *plf)
|
|
{
|
|
struct ab8500 *ab8500;
|
|
struct resource *resource;
|
|
int ret;
|
|
|
|
ab8500 = kzalloc(sizeof *ab8500, GFP_KERNEL);
|
|
if (!ab8500)
|
|
return -ENOMEM;
|
|
|
|
ab8500->dev = &plf->dev;
|
|
|
|
resource = platform_get_resource(plf, IORESOURCE_IRQ, 0);
|
|
if (!resource) {
|
|
kfree(ab8500);
|
|
return -ENODEV;
|
|
}
|
|
|
|
ab8500->irq = resource->start;
|
|
|
|
ab8500->read = ab8500_i2c_read;
|
|
ab8500->write = ab8500_i2c_write;
|
|
|
|
platform_set_drvdata(plf, ab8500);
|
|
|
|
ret = ab8500_init(ab8500);
|
|
if (ret)
|
|
kfree(ab8500);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __devexit ab8500_i2c_remove(struct platform_device *plf)
|
|
{
|
|
struct ab8500 *ab8500 = platform_get_drvdata(plf);
|
|
|
|
ab8500_exit(ab8500);
|
|
kfree(ab8500);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver ab8500_i2c_driver = {
|
|
.driver = {
|
|
.name = "ab8500-i2c",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = ab8500_i2c_probe,
|
|
.remove = __devexit_p(ab8500_i2c_remove)
|
|
};
|
|
|
|
static int __init ab8500_i2c_init(void)
|
|
{
|
|
return platform_driver_register(&ab8500_i2c_driver);
|
|
}
|
|
|
|
static void __exit ab8500_i2c_exit(void)
|
|
{
|
|
platform_driver_unregister(&ab8500_i2c_driver);
|
|
}
|
|
subsys_initcall(ab8500_i2c_init);
|
|
module_exit(ab8500_i2c_exit);
|
|
|
|
MODULE_AUTHOR("Mattias WALLIN <mattias.wallin@stericsson.com");
|
|
MODULE_DESCRIPTION("AB8500 Core access via PRCMU I2C");
|
|
MODULE_LICENSE("GPL v2");
|