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/*
* 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;
};
/*
* Grrr I severly dislike buggy BIOS-es. At least one BIOS enumerates
* the max17047 both through the INT33FE ACPI device (it is right there
* in the resources table) as well as through a separate MAX17047 device.
*
* These helpers are used to work around this by checking if an i2c-client
* for the max17047 has already been registered.
*/
static int cht_int33fe_check_for_max17047(struct device *dev, void *data)
{
struct i2c_client **max17047 = data;
struct acpi_device *adev;
const char *hid;
adev = ACPI_COMPANION(dev);
if (!adev)
return 0;
hid = acpi_device_hid(adev);
/* The MAX17047 ACPI node doesn't have an UID, so we don't check that */
if (strcmp(hid, "MAX17047"))
return 0;
*max17047 = to_i2c_client(dev);
return 1;
}
static struct i2c_client *cht_int33fe_find_max17047(void)
{
struct i2c_client *max17047 = NULL;
i2c_for_each_dev(&max17047, cht_int33fe_check_for_max17047);
return max17047;
}
static const char * const max17047_suppliers[] = { "bq24190-charger" };
static const struct property_entry max17047_props[] = {
PROPERTY_ENTRY_STRING_ARRAY("supplied-from", max17047_suppliers),
{ }
};
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;
struct i2c_client *max17047;
unsigned long long ptyp;
acpi_status status;
int fusb302_irq;
int ret;
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;
/* Work around BIOS bug, see comment on cht_int33fe_find_max17047 */
max17047 = cht_int33fe_find_max17047();
if (max17047) {
/* Pre-existing i2c-client for the max17047, add device-props */
ret = device_add_properties(&max17047->dev, max17047_props);
if (ret)
return ret;
/* And re-probe to get the new device-props applied. */
ret = device_reprobe(&max17047->dev);
if (ret)
dev_warn(dev, "Reprobing max17047 error: %d\n", ret);
} else {
memset(&board_info, 0, sizeof(board_info));
strlcpy(board_info.type, "max17047", I2C_NAME_SIZE);
board_info.properties = max17047_props;
data->max17047 = i2c_acpi_new_device(dev, 1, &board_info);
if (!data->max17047)
return -EPROBE_DEFER; /* Wait for 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:
if (data->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);
if (data->max17047)
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");
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