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