mirror of https://gitee.com/openkylin/linux.git
144 lines
4.0 KiB
C
144 lines
4.0 KiB
C
/*
|
|
* Intel Cherry Trail ACPI INT33FE pseudo device driver
|
|
*
|
|
* Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com>
|
|
*
|
|
* 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
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* Some Intel Cherry Trail based device which ship with Windows 10, have
|
|
* this weird INT33FE ACPI device with a CRS table with 4 I2cSerialBusV2
|
|
* resources, for 4 different chips attached to various i2c busses:
|
|
* 1. The Whiskey Cove pmic, which is also described by the INT34D3 ACPI device
|
|
* 2. Maxim MAX17047 Fuel Gauge Controller
|
|
* 3. FUSB302 USB Type-C Controller
|
|
* 4. PI3USB30532 USB switch
|
|
*
|
|
* So this driver is a stub / pseudo driver whose only purpose is to
|
|
* instantiate i2c-clients for chips 2 - 4, so that standard i2c drivers
|
|
* for these chips can bind to the them.
|
|
*/
|
|
|
|
#include <linux/acpi.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
|
|
#define EXPECTED_PTYPE 4
|
|
|
|
struct cht_int33fe_data {
|
|
struct i2c_client *max17047;
|
|
struct i2c_client *fusb302;
|
|
struct i2c_client *pi3usb30532;
|
|
};
|
|
|
|
static int cht_int33fe_probe(struct i2c_client *client)
|
|
{
|
|
struct device *dev = &client->dev;
|
|
struct i2c_board_info board_info;
|
|
struct cht_int33fe_data *data;
|
|
unsigned long long ptyp;
|
|
acpi_status status;
|
|
int fusb302_irq;
|
|
|
|
status = acpi_evaluate_integer(ACPI_HANDLE(dev), "PTYP", NULL, &ptyp);
|
|
if (ACPI_FAILURE(status)) {
|
|
dev_err(dev, "Error getting PTYPE\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
/*
|
|
* The same ACPI HID is used for different configurations check PTYP
|
|
* to ensure that we are dealing with the expected config.
|
|
*/
|
|
if (ptyp != EXPECTED_PTYPE)
|
|
return -ENODEV;
|
|
|
|
/* The FUSB302 uses the irq at index 1 and is the only irq user */
|
|
fusb302_irq = acpi_dev_gpio_irq_get(ACPI_COMPANION(dev), 1);
|
|
if (fusb302_irq < 0) {
|
|
if (fusb302_irq != -EPROBE_DEFER)
|
|
dev_err(dev, "Error getting FUSB302 irq\n");
|
|
return fusb302_irq;
|
|
}
|
|
|
|
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
memset(&board_info, 0, sizeof(board_info));
|
|
strlcpy(board_info.type, "max17047", I2C_NAME_SIZE);
|
|
|
|
data->max17047 = i2c_acpi_new_device(dev, 1, &board_info);
|
|
if (!data->max17047)
|
|
return -EPROBE_DEFER; /* Wait for the i2c-adapter to load */
|
|
|
|
memset(&board_info, 0, sizeof(board_info));
|
|
strlcpy(board_info.type, "fusb302", I2C_NAME_SIZE);
|
|
board_info.irq = fusb302_irq;
|
|
|
|
data->fusb302 = i2c_acpi_new_device(dev, 2, &board_info);
|
|
if (!data->fusb302)
|
|
goto out_unregister_max17047;
|
|
|
|
memset(&board_info, 0, sizeof(board_info));
|
|
strlcpy(board_info.type, "pi3usb30532", I2C_NAME_SIZE);
|
|
|
|
data->pi3usb30532 = i2c_acpi_new_device(dev, 3, &board_info);
|
|
if (!data->pi3usb30532)
|
|
goto out_unregister_fusb302;
|
|
|
|
i2c_set_clientdata(client, data);
|
|
|
|
return 0;
|
|
|
|
out_unregister_fusb302:
|
|
i2c_unregister_device(data->fusb302);
|
|
|
|
out_unregister_max17047:
|
|
i2c_unregister_device(data->max17047);
|
|
|
|
return -EPROBE_DEFER; /* Wait for the i2c-adapter to load */
|
|
}
|
|
|
|
static int cht_int33fe_remove(struct i2c_client *i2c)
|
|
{
|
|
struct cht_int33fe_data *data = i2c_get_clientdata(i2c);
|
|
|
|
i2c_unregister_device(data->pi3usb30532);
|
|
i2c_unregister_device(data->fusb302);
|
|
i2c_unregister_device(data->max17047);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id cht_int33fe_i2c_id[] = {
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, cht_int33fe_i2c_id);
|
|
|
|
static const struct acpi_device_id cht_int33fe_acpi_ids[] = {
|
|
{ "INT33FE", },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(acpi, cht_int33fe_acpi_ids);
|
|
|
|
static struct i2c_driver cht_int33fe_driver = {
|
|
.driver = {
|
|
.name = "Intel Cherry Trail ACPI INT33FE driver",
|
|
.acpi_match_table = ACPI_PTR(cht_int33fe_acpi_ids),
|
|
},
|
|
.probe_new = cht_int33fe_probe,
|
|
.remove = cht_int33fe_remove,
|
|
.id_table = cht_int33fe_i2c_id,
|
|
.disable_i2c_core_irq_mapping = true,
|
|
};
|
|
|
|
module_i2c_driver(cht_int33fe_driver);
|
|
|
|
MODULE_DESCRIPTION("Intel Cherry Trail ACPI INT33FE pseudo device driver");
|
|
MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
|
|
MODULE_LICENSE("GPL");
|