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/*
* lis3lv02d_spi - SPI glue layer for lis3lv02d
*
* Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* publishhed by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/spi/spi.h>
#include <linux/pm.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/of_device.h>
#include "lis3lv02d.h"
#define DRV_NAME "lis3lv02d_spi"
#define LIS3_SPI_READ 0x80
static int lis3_spi_read(struct lis3lv02d *lis3, int reg, u8 *v)
{
struct spi_device *spi = lis3->bus_priv;
int ret = spi_w8r8(spi, reg | LIS3_SPI_READ);
if (ret < 0)
return -EINVAL;
*v = (u8) ret;
return 0;
}
static int lis3_spi_write(struct lis3lv02d *lis3, int reg, u8 val)
{
u8 tmp[2] = { reg, val };
struct spi_device *spi = lis3->bus_priv;
return spi_write(spi, tmp, sizeof(tmp));
}
static int lis3_spi_init(struct lis3lv02d *lis3)
{
u8 reg;
int ret;
/* power up the device */
ret = lis3->read(lis3, CTRL_REG1, ®);
if (ret < 0)
return ret;
reg |= CTRL1_PD0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;
return lis3->write(lis3, CTRL_REG1, reg);
}
static union axis_conversion lis3lv02d_axis_normal =
{ .as_array = { 1, 2, 3 } };
#ifdef CONFIG_OF
static struct of_device_id lis302dl_spi_dt_ids[] = {
{ .compatible = "st,lis302dl-spi" },
{}
};
MODULE_DEVICE_TABLE(of, lis302dl_spi_dt_ids);
#endif
static int lis302dl_spi_probe(struct spi_device *spi)
{
int ret;
spi->bits_per_word = 8;
spi->mode = SPI_MODE_0;
ret = spi_setup(spi);
if (ret < 0)
return ret;
lis3_dev.bus_priv = spi;
lis3_dev.init = lis3_spi_init;
lis3_dev.read = lis3_spi_read;
lis3_dev.write = lis3_spi_write;
lis3_dev.irq = spi->irq;
lis3_dev.ac = lis3lv02d_axis_normal;
lis3_dev.pdata = spi->dev.platform_data;
#ifdef CONFIG_OF
if (of_match_device(lis302dl_spi_dt_ids, &spi->dev)) {
lis3_dev.of_node = spi->dev.of_node;
ret = lis3lv02d_init_dt(&lis3_dev);
if (ret)
return ret;
}
#endif
spi_set_drvdata(spi, &lis3_dev);
return lis3lv02d_init_device(&lis3_dev);
}
static int lis302dl_spi_remove(struct spi_device *spi)
{
struct lis3lv02d *lis3 = spi_get_drvdata(spi);
lis3lv02d_joystick_disable(lis3);
lis3lv02d_poweroff(lis3);
return lis3lv02d_remove_fs(&lis3_dev);
}
#ifdef CONFIG_PM_SLEEP
static int lis3lv02d_spi_suspend(struct device *dev)
{
struct spi_device *spi = to_spi_device(dev);
struct lis3lv02d *lis3 = spi_get_drvdata(spi);
if (!lis3->pdata || !lis3->pdata->wakeup_flags)
lis3lv02d_poweroff(&lis3_dev);
return 0;
}
static int lis3lv02d_spi_resume(struct device *dev)
{
struct spi_device *spi = to_spi_device(dev);
struct lis3lv02d *lis3 = spi_get_drvdata(spi);
if (!lis3->pdata || !lis3->pdata->wakeup_flags)
lis3lv02d_poweron(lis3);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(lis3lv02d_spi_pm, lis3lv02d_spi_suspend,
lis3lv02d_spi_resume);
static struct spi_driver lis302dl_spi_driver = {
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
.pm = &lis3lv02d_spi_pm,
.of_match_table = of_match_ptr(lis302dl_spi_dt_ids),
},
.probe = lis302dl_spi_probe,
.remove = lis302dl_spi_remove,
};
module_spi_driver(lis302dl_spi_driver);
MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
MODULE_DESCRIPTION("lis3lv02d SPI glue layer");
MODULE_LICENSE("GPL");
MODULE_ALIAS("spi:" DRV_NAME);
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