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/*
* STMicroelectronics lsm6ds3 spi driver
*
* Copyright 2014 STMicroelectronics Inc.
*
* Denis Ciocca <denis.ciocca@st.com>
*
* Licensed under the GPL-2.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
#include <linux/iio/iio.h>
#include "st_lsm6ds3.h"
#define ST_SENSORS_SPI_READ 0x80
static int st_lsm6ds3_spi_read(struct lsm6ds3_data *cdata,
u8 reg_addr, int len, u8 *data, bool b_lock)
{
int err;
struct spi_transfer xfers[] = {
{
.tx_buf = cdata->tb.tx_buf,
.bits_per_word = 8,
.len = 1,
},
{
.rx_buf = cdata->tb.rx_buf,
.bits_per_word = 8,
.len = len,
}
};
if (b_lock)
mutex_lock(&cdata->bank_registers_lock);
mutex_lock(&cdata->tb.buf_lock);
cdata->tb.tx_buf[0] = reg_addr | ST_SENSORS_SPI_READ;
err = spi_sync_transfer(to_spi_device(cdata->dev),
xfers, ARRAY_SIZE(xfers));
if (err)
goto acc_spi_read_error;
memcpy(data, cdata->tb.rx_buf, len*sizeof(u8));
mutex_unlock(&cdata->tb.buf_lock);
if (b_lock)
mutex_unlock(&cdata->bank_registers_lock);
return len;
acc_spi_read_error:
mutex_unlock(&cdata->tb.buf_lock);
if (b_lock)
mutex_unlock(&cdata->bank_registers_lock);
return err;
}
static int st_lsm6ds3_spi_write(struct lsm6ds3_data *cdata,
u8 reg_addr, int len, u8 *data, bool b_lock)
{
int err;
struct spi_transfer xfers = {
.tx_buf = cdata->tb.tx_buf,
.bits_per_word = 8,
.len = len + 1,
};
if (len >= ST_LSM6DS3_RX_MAX_LENGTH)
return -ENOMEM;
if (b_lock)
mutex_lock(&cdata->bank_registers_lock);
mutex_lock(&cdata->tb.buf_lock);
cdata->tb.tx_buf[0] = reg_addr;
memcpy(&cdata->tb.tx_buf[1], data, len);
err = spi_sync_transfer(to_spi_device(cdata->dev), &xfers, 1);
mutex_unlock(&cdata->tb.buf_lock);
if (b_lock)
mutex_unlock(&cdata->bank_registers_lock);
return err;
}
static const struct st_lsm6ds3_transfer_function st_lsm6ds3_tf_spi = {
.write = st_lsm6ds3_spi_write,
.read = st_lsm6ds3_spi_read,
};
static int st_lsm6ds3_spi_probe(struct spi_device *spi)
{
int err;
struct lsm6ds3_data *cdata;
cdata = kmalloc(sizeof(*cdata), GFP_KERNEL);
if (!cdata)
return -ENOMEM;
cdata->dev = &spi->dev;
cdata->name = spi->modalias;
spi_set_drvdata(spi, cdata);
cdata->tf = &st_lsm6ds3_tf_spi;
err = st_lsm6ds3_common_probe(cdata, spi->irq);
if (err < 0)
goto free_data;
return 0;
free_data:
kfree(cdata);
return err;
}
static int st_lsm6ds3_spi_remove(struct spi_device *spi)
{
struct lsm6ds3_data *cdata = spi_get_drvdata(spi);
st_lsm6ds3_common_remove(cdata, spi->irq);
kfree(cdata);
return 0;
}
#ifdef CONFIG_PM
static int st_lsm6ds3_suspend(struct device *dev)
{
struct lsm6ds3_data *cdata = spi_get_drvdata(to_spi_device(dev));
return st_lsm6ds3_common_suspend(cdata);
}
static int st_lsm6ds3_resume(struct device *dev)
{
struct lsm6ds3_data *cdata = spi_get_drvdata(to_spi_device(dev));
return st_lsm6ds3_common_resume(cdata);
}
static const struct dev_pm_ops st_lsm6ds3_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(st_lsm6ds3_suspend, st_lsm6ds3_resume)
};
#define ST_LSM6DS3_PM_OPS (&st_lsm6ds3_pm_ops)
#else /* CONFIG_PM */
#define ST_LSM6DS3_PM_OPS NULL
#endif /* CONFIG_PM */
static const struct spi_device_id st_lsm6ds3_id_table[] = {
{ LSM6DS3_DEV_NAME },
{ },
};
MODULE_DEVICE_TABLE(spi, st_lsm6ds3_id_table);
static struct spi_driver st_lsm6ds3_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "st-lsm6ds3-spi",
.pm = ST_LSM6DS3_PM_OPS,
},
.probe = st_lsm6ds3_spi_probe,
.remove = st_lsm6ds3_spi_remove,
.id_table = st_lsm6ds3_id_table,
};
module_spi_driver(st_lsm6ds3_driver);
MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
MODULE_DESCRIPTION("STMicroelectronics lsm6ds3 spi driver");
MODULE_LICENSE("GPL v2");
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