mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-03 00:16:39 +07:00
25fc503e2d
Support driver probe by reading unique HID on systems based on ACPI instead of DT compatible strings. Signed-off-by: Shrirang Bagul <shrirang.bagul@canonical.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
119 lines
2.6 KiB
C
119 lines
2.6 KiB
C
/*
|
|
* STMicroelectronics hts221 i2c driver
|
|
*
|
|
* Copyright 2016 STMicroelectronics Inc.
|
|
*
|
|
* Lorenzo Bianconi <lorenzo.bianconi@st.com>
|
|
*
|
|
* Licensed under the GPL-2.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/acpi.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/slab.h>
|
|
#include "hts221.h"
|
|
|
|
#define I2C_AUTO_INCREMENT 0x80
|
|
|
|
static int hts221_i2c_read(struct device *dev, u8 addr, int len, u8 *data)
|
|
{
|
|
struct i2c_msg msg[2];
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
|
|
if (len > 1)
|
|
addr |= I2C_AUTO_INCREMENT;
|
|
|
|
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;
|
|
|
|
return i2c_transfer(client->adapter, msg, 2);
|
|
}
|
|
|
|
static int hts221_i2c_write(struct device *dev, u8 addr, int len, u8 *data)
|
|
{
|
|
u8 send[len + 1];
|
|
struct i2c_msg msg;
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
|
|
if (len > 1)
|
|
addr |= I2C_AUTO_INCREMENT;
|
|
|
|
send[0] = addr;
|
|
memcpy(&send[1], data, len * sizeof(u8));
|
|
|
|
msg.addr = client->addr;
|
|
msg.flags = client->flags;
|
|
msg.len = len + 1;
|
|
msg.buf = send;
|
|
|
|
return i2c_transfer(client->adapter, &msg, 1);
|
|
}
|
|
|
|
static const struct hts221_transfer_function hts221_transfer_fn = {
|
|
.read = hts221_i2c_read,
|
|
.write = hts221_i2c_write,
|
|
};
|
|
|
|
static int hts221_i2c_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct hts221_hw *hw;
|
|
struct iio_dev *iio_dev;
|
|
|
|
iio_dev = devm_iio_device_alloc(&client->dev, sizeof(*hw));
|
|
if (!iio_dev)
|
|
return -ENOMEM;
|
|
|
|
i2c_set_clientdata(client, iio_dev);
|
|
|
|
hw = iio_priv(iio_dev);
|
|
hw->name = client->name;
|
|
hw->dev = &client->dev;
|
|
hw->irq = client->irq;
|
|
hw->tf = &hts221_transfer_fn;
|
|
|
|
return hts221_probe(iio_dev);
|
|
}
|
|
|
|
static const struct acpi_device_id hts221_acpi_match[] = {
|
|
{"SMO9100", 0},
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(acpi, hts221_acpi_match);
|
|
|
|
static const struct of_device_id hts221_i2c_of_match[] = {
|
|
{ .compatible = "st,hts221", },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, hts221_i2c_of_match);
|
|
|
|
static const struct i2c_device_id hts221_i2c_id_table[] = {
|
|
{ HTS221_DEV_NAME },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, hts221_i2c_id_table);
|
|
|
|
static struct i2c_driver hts221_driver = {
|
|
.driver = {
|
|
.name = "hts221_i2c",
|
|
.of_match_table = of_match_ptr(hts221_i2c_of_match),
|
|
.acpi_match_table = ACPI_PTR(hts221_acpi_match),
|
|
},
|
|
.probe = hts221_i2c_probe,
|
|
.id_table = hts221_i2c_id_table,
|
|
};
|
|
module_i2c_driver(hts221_driver);
|
|
|
|
MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi@st.com>");
|
|
MODULE_DESCRIPTION("STMicroelectronics hts221 i2c driver");
|
|
MODULE_LICENSE("GPL v2");
|