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/*
* STMicroelectronics lsm6ds3 i2c 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/i2c.h>
#include <linux/iio/iio.h>
#include "st_lsm6ds3.h"
static int st_lsm6ds3_i2c_read(struct lsm6ds3_data *cdata,
u8 reg_addr, int len, u8 *data, bool b_lock)
{
int err = 0;
struct i2c_msg msg[2];
struct i2c_client *client = to_i2c_client(cdata->dev);
msg[0].addr = client->addr;
msg[0].flags = client->flags;
msg[0].len = 1;
msg[0].buf = ®_addr;
msg[1].addr = client->addr;
msg[1].flags = client->flags | I2C_M_RD;
msg[1].len = len;
msg[1].buf = data;
if (b_lock) {
mutex_lock(&cdata->bank_registers_lock);
err = i2c_transfer(client->adapter, msg, 2);
mutex_unlock(&cdata->bank_registers_lock);
} else
err = i2c_transfer(client->adapter, msg, 2);
return err;
}
static int st_lsm6ds3_i2c_write(struct lsm6ds3_data *cdata,
u8 reg_addr, int len, u8 *data, bool b_lock)
{
int err = 0;
u8 send[len + 1];
struct i2c_msg msg;
struct i2c_client *client = to_i2c_client(cdata->dev);
send[0] = reg_addr;
memcpy(&send[1], data, len * sizeof(u8));
len++;
msg.addr = client->addr;
msg.flags = client->flags;
msg.len = len;
msg.buf = send;
if (b_lock) {
mutex_lock(&cdata->bank_registers_lock);
err = i2c_transfer(client->adapter, &msg, 1);
mutex_unlock(&cdata->bank_registers_lock);
} else
err = i2c_transfer(client->adapter, &msg, 1);
return err;
}
static const struct st_lsm6ds3_transfer_function st_lsm6ds3_tf_i2c = {
.write = st_lsm6ds3_i2c_write,
.read = st_lsm6ds3_i2c_read,
};
static int st_lsm6ds3_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int err;
struct lsm6ds3_data *cdata;
cdata = kmalloc(sizeof(*cdata), GFP_KERNEL);
if (!cdata)
return -ENOMEM;
cdata->dev = &client->dev;
cdata->name = client->name;
i2c_set_clientdata(client, cdata);
cdata->tf = &st_lsm6ds3_tf_i2c;
err = st_lsm6ds3_common_probe(cdata, client->irq);
if (err < 0)
goto free_data;
return 0;
free_data:
kfree(cdata);
return err;
}
static int st_lsm6ds3_i2c_remove(struct i2c_client *client)
{
struct lsm6ds3_data *cdata = i2c_get_clientdata(client);
st_lsm6ds3_common_remove(cdata, client->irq);
kfree(cdata);
return 0;
}
#ifdef CONFIG_PM
static int st_lsm6ds3_suspend(struct device *dev)
{
struct lsm6ds3_data *cdata = i2c_get_clientdata(to_i2c_client(dev));
return st_lsm6ds3_common_suspend(cdata);
}
static int st_lsm6ds3_resume(struct device *dev)
{
struct lsm6ds3_data *cdata = i2c_get_clientdata(to_i2c_client(dev));
return st_lsm6ds3_common_resume(cdata);
}
static int st_lsm6ds3_suspend_noirq(struct device *dev)
{
struct lsm6ds3_data *cdata = i2c_get_clientdata(to_i2c_client(dev));
return st_lsm6ds3_common_suspend_noirq(cdata);
}
static int st_lsm6ds3_resume_noirq(struct device *dev)
{
struct lsm6ds3_data *cdata = i2c_get_clientdata(to_i2c_client(dev));
return st_lsm6ds3_common_resume_noirq(cdata);
}
static const struct dev_pm_ops st_lsm6ds3_pm_ops = {
.suspend = st_lsm6ds3_suspend,
.resume = st_lsm6ds3_resume,
.suspend_noirq = st_lsm6ds3_suspend_noirq,
.resume_noirq = st_lsm6ds3_resume_noirq
};
#define ST_LSM6DS3_PM_OPS (&st_lsm6ds3_pm_ops)
#else /* CONFIG_PM */
#define ST_LSM6DS3_PM_OPS NULL
#endif /* CONFIG_PM */
static const struct i2c_device_id st_lsm6ds3_id_table[] = {
{ LSM6DS3_DEV_NAME },
{ },
};
MODULE_DEVICE_TABLE(i2c, st_lsm6ds3_id_table);
static struct i2c_driver st_lsm6ds3_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "st-lsm6ds3-i2c",
.pm = ST_LSM6DS3_PM_OPS,
},
.probe = st_lsm6ds3_i2c_probe,
.remove = st_lsm6ds3_i2c_remove,
.id_table = st_lsm6ds3_id_table,
};
module_i2c_driver(st_lsm6ds3_driver);
MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
MODULE_DESCRIPTION("STMicroelectronics lsm6ds3 i2c driver");
MODULE_LICENSE("GPL v2");
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