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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Common code for Intel Cherry Trail ACPI INT33FE pseudo device drivers
- * (USB Micro-B and Type-C connector variants).
- *
- * Copyright (c) 2019 Yauhen Kharuzhy <jekhor@gmail.com>
- */
- #include <linux/acpi.h>
- #include <linux/i2c.h>
- #include <linux/module.h>
- #include <linux/platform_device.h>
- #include <linux/slab.h>
- #include "intel_cht_int33fe_common.h"
- #define EXPECTED_PTYPE 4
- static int cht_int33fe_i2c_res_filter(struct acpi_resource *ares, void *data)
- {
- struct acpi_resource_i2c_serialbus *sb;
- int *count = data;
- if (i2c_acpi_get_i2c_resource(ares, &sb))
- (*count)++;
- return 1;
- }
- static int cht_int33fe_count_i2c_clients(struct device *dev)
- {
- struct acpi_device *adev = ACPI_COMPANION(dev);
- LIST_HEAD(resource_list);
- int count = 0;
- int ret;
- ret = acpi_dev_get_resources(adev, &resource_list,
- cht_int33fe_i2c_res_filter, &count);
- acpi_dev_free_resource_list(&resource_list);
- if (ret < 0)
- return ret;
- return count;
- }
- static int cht_int33fe_check_hw_type(struct device *dev)
- {
- unsigned long long ptyp;
- acpi_status status;
- 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;
- /* Check presence of INT34D3 (hardware-rev 3) expected for ptype == 4 */
- if (!acpi_dev_present("INT34D3", "1", 3)) {
- dev_err(dev, "Error PTYPE == %d, but no INT34D3 device\n",
- EXPECTED_PTYPE);
- return -ENODEV;
- }
- ret = cht_int33fe_count_i2c_clients(dev);
- if (ret < 0)
- return ret;
- switch (ret) {
- case 2:
- return INT33FE_HW_MICROB;
- case 4:
- return INT33FE_HW_TYPEC;
- default:
- return -ENODEV;
- }
- }
- static int cht_int33fe_probe(struct platform_device *pdev)
- {
- struct cht_int33fe_data *data;
- struct device *dev = &pdev->dev;
- int ret;
- ret = cht_int33fe_check_hw_type(dev);
- if (ret < 0)
- return ret;
- data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
- if (!data)
- return -ENOMEM;
- data->dev = dev;
- switch (ret) {
- case INT33FE_HW_MICROB:
- data->probe = cht_int33fe_microb_probe;
- data->remove = cht_int33fe_microb_remove;
- break;
- case INT33FE_HW_TYPEC:
- data->probe = cht_int33fe_typec_probe;
- data->remove = cht_int33fe_typec_remove;
- break;
- }
- platform_set_drvdata(pdev, data);
- return data->probe(data);
- }
- static int cht_int33fe_remove(struct platform_device *pdev)
- {
- struct cht_int33fe_data *data = platform_get_drvdata(pdev);
- return data->remove(data);
- }
- static const struct acpi_device_id cht_int33fe_acpi_ids[] = {
- { "INT33FE", },
- { }
- };
- MODULE_DEVICE_TABLE(acpi, cht_int33fe_acpi_ids);
- static struct platform_driver cht_int33fe_driver = {
- .driver = {
- .name = "Intel Cherry Trail ACPI INT33FE driver",
- .acpi_match_table = ACPI_PTR(cht_int33fe_acpi_ids),
- },
- .probe = cht_int33fe_probe,
- .remove = cht_int33fe_remove,
- };
- module_platform_driver(cht_int33fe_driver);
- MODULE_DESCRIPTION("Intel Cherry Trail ACPI INT33FE pseudo device driver");
- MODULE_AUTHOR("Yauhen Kharuzhy <jekhor@gmail.com>");
- MODULE_LICENSE("GPL v2");
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