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/*
* tps65912-spi.c -- SPI access for TI TPS65912x PMIC
*
* Copyright 2011 Texas Instruments Inc.
*
* Author: Margarita Olaya Cabrera <magi@slimlogic.co.uk>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This driver is based on wm8350 implementation.
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/gpio.h>
#include <linux/spi/spi.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tps65912.h>
#include <linux/of_device.h>
static int tps65912_spi_write(struct tps65912 *tps65912, u8 addr,
int bytes, void *src)
{
struct spi_device *spi = tps65912->control_data;
/* bit 23 is the read/write bit */
u32 tx = 1 << 23 | addr << 15 | *(u8 *)src;
struct spi_transfer xfer;
struct spi_message msg;
if ((spi == NULL) || (bytes == 0))
return -ENODATA;
if (bytes > 1)
dev_err(tps65912->dev, "too many bytes to write %d\n", bytes);
memset(&xfer, 0, sizeof(xfer));
/* Do not setup the bits per transfer or the speed, as this causes the
driver to re-initialize, which wastes time. */
xfer.tx_buf = &tx;
xfer.len = sizeof(tx);
xfer.bits_per_word = 24;
spi_message_init(&msg);
spi_message_add_tail(&xfer, &msg);
return spi_sync(spi, &msg);
}
static int tps65912_spi_read(struct tps65912 *tps65912, u8 addr,
int bytes, void *dest)
{
struct spi_device *spi = tps65912->control_data;
/* bit 23 is the read/write bit */
u32 tx = 0 << 23 | addr << 15;
struct spi_transfer xfer;
struct spi_message msg;
u32 rx;
int ret;
if ((spi == NULL) || (bytes == 0))
return -ENODATA;
if (bytes > 1)
dev_err(tps65912->dev, "too many bytes to read %d\n", bytes);
memset(&xfer, 0, sizeof(xfer));
/* Do not setup the bits per transfer or the speed, as this causes the
driver to re-initialize, which wastes time. */
xfer.tx_buf = &tx;
xfer.rx_buf = ℞
xfer.len = sizeof(tx);
xfer.bits_per_word = 24;
spi_message_init(&msg);
spi_message_add_tail(&xfer, &msg);
ret = spi_sync(spi, &msg);
if (!ret)
*(u8 *)dest = (u8)rx & 0xff;
return ret;
}
#ifdef CONFIG_OF
static struct of_device_id tps65912_of_match[] = {
{ .compatible = "ti,tps65912" },
{ },
};
MODULE_DEVICE_TABLE(of, tps65912_of_match);
#endif
static int tps65912_spi_probe(struct spi_device *spi)
{
struct tps65912 *tps65912;
tps65912 = kzalloc(sizeof(struct tps65912), GFP_KERNEL);
if (tps65912 == NULL)
return -ENOMEM;
tps65912->dev = &spi->dev;
tps65912->control_data = spi;
tps65912->read = tps65912_spi_read;
tps65912->write = tps65912_spi_write;
mutex_init(&tps65912->pm_lock);
spi_set_drvdata(spi, tps65912);
return tps65912_device_init(tps65912);
}
static int tps65912_spi_remove(struct spi_device *spi)
{
struct tps65912 *tps65912 = spi_get_drvdata(spi);
tps65912_device_exit(tps65912);
return 0;
}
int tps65912_spi_suspend_late(struct device *dev)
{
struct tps65912 *tps65912 = dev_get_drvdata(dev);
if (tps65912)
mutex_lock(&tps65912->pm_lock);
return 0;
}
int tps65912_spi_resume_early(struct device *dev)
{
struct tps65912 *tps65912 = dev_get_drvdata(dev);
if (tps65912)
mutex_unlock(&tps65912->pm_lock);
return 0;
}
static struct dev_pm_ops tps65912_pm_ops = {
.suspend_late = tps65912_spi_suspend_late,
.resume_early = tps65912_spi_resume_early,
};
static struct spi_driver tps65912_spi_driver = {
.driver = {
.name = "tps65912",
.pm = &tps65912_pm_ops,
.bus = &spi_bus_type,
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(tps65912_of_match),
},
.probe = tps65912_spi_probe,
.remove = tps65912_spi_remove,
};
static int __init tps65912_spi_init(void)
{
int ret;
ret = spi_register_driver(&tps65912_spi_driver);
if (ret != 0)
pr_err("Failed to register TPS65912 SPI driver: %d\n", ret);
return 0;
}
/* init early so consumer devices can complete system boot */
subsys_initcall(tps65912_spi_init);
static void __exit tps65912_spi_exit(void)
{
spi_unregister_driver(&tps65912_spi_driver);
}
module_exit(tps65912_spi_exit);
MODULE_AUTHOR("Margarita Olaya <magi@slimlogic.co.uk>");
MODULE_DESCRIPTION("SPI support for TPS65912 chip family mfd");
MODULE_LICENSE("GPL");
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