1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Common code for Intel Cherry Trail ACPI INT33FE pseudo device drivers
  4 * (USB Micro-B and Type-C connector variants).
  5 *
  6 * Copyright (c) 2019 Yauhen Kharuzhy <jekhor@gmail.com>
  7 */
  8
  9#include <linux/acpi.h>
 10#include <linux/i2c.h>
 11#include <linux/module.h>
 12#include <linux/platform_device.h>
 13#include <linux/slab.h>
 14
 15#include "intel_cht_int33fe_common.h"
 16
 17#define EXPECTED_PTYPE		4
 18
 19static int cht_int33fe_i2c_res_filter(struct acpi_resource *ares, void *data)
 20{
 21	struct acpi_resource_i2c_serialbus *sb;
 22	int *count = data;
 23
 24	if (i2c_acpi_get_i2c_resource(ares, &sb))
 25		(*count)++;
 26
 27	return 1;
 28}
 29
 30static int cht_int33fe_count_i2c_clients(struct device *dev)
 31{
 32	struct acpi_device *adev = ACPI_COMPANION(dev);
 33	LIST_HEAD(resource_list);
 34	int count = 0;
 35	int ret;
 36
 37	ret = acpi_dev_get_resources(adev, &resource_list,
 38				     cht_int33fe_i2c_res_filter, &count);
 39	acpi_dev_free_resource_list(&resource_list);
 40	if (ret < 0)
 41		return ret;
 42
 43	return count;
 44}
 45
 46static int cht_int33fe_check_hw_type(struct device *dev)
 47{
 48	unsigned long long ptyp;
 49	acpi_status status;
 50	int ret;
 51
 52	status = acpi_evaluate_integer(ACPI_HANDLE(dev), "PTYP", NULL, &ptyp);
 53	if (ACPI_FAILURE(status)) {
 54		dev_err(dev, "Error getting PTYPE\n");
 55		return -ENODEV;
 56	}
 57
 58	/*
 59	 * The same ACPI HID is used for different configurations check PTYP
 60	 * to ensure that we are dealing with the expected config.
 61	 */
 62	if (ptyp != EXPECTED_PTYPE)
 63		return -ENODEV;
 64
 65	/* Check presence of INT34D3 (hardware-rev 3) expected for ptype == 4 */
 66	if (!acpi_dev_present("INT34D3", "1", 3)) {
 67		dev_err(dev, "Error PTYPE == %d, but no INT34D3 device\n",
 68			EXPECTED_PTYPE);
 69		return -ENODEV;
 70	}
 71
 72	ret = cht_int33fe_count_i2c_clients(dev);
 73	if (ret < 0)
 74		return ret;
 75
 76	switch (ret) {
 77	case 2:
 78		return INT33FE_HW_MICROB;
 79	case 4:
 80		return INT33FE_HW_TYPEC;
 81	default:
 82		return -ENODEV;
 83	}
 84}
 85
 86static int cht_int33fe_probe(struct platform_device *pdev)
 87{
 88	struct cht_int33fe_data *data;
 89	struct device *dev = &pdev->dev;
 90	int ret;
 91
 92	ret = cht_int33fe_check_hw_type(dev);
 93	if (ret < 0)
 94		return ret;
 95
 96	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 97	if (!data)
 98		return -ENOMEM;
 99
100	data->dev = dev;
101
102	switch (ret) {
103	case INT33FE_HW_MICROB:
104		data->probe = cht_int33fe_microb_probe;
105		data->remove = cht_int33fe_microb_remove;
106		break;
107
108	case INT33FE_HW_TYPEC:
109		data->probe = cht_int33fe_typec_probe;
110		data->remove = cht_int33fe_typec_remove;
111		break;
112	}
113
114	platform_set_drvdata(pdev, data);
115
116	return data->probe(data);
117}
118
119static int cht_int33fe_remove(struct platform_device *pdev)
120{
121	struct cht_int33fe_data *data = platform_get_drvdata(pdev);
122
123	return data->remove(data);
124}
125
126static const struct acpi_device_id cht_int33fe_acpi_ids[] = {
127	{ "INT33FE", },
128	{ }
129};
130MODULE_DEVICE_TABLE(acpi, cht_int33fe_acpi_ids);
131
132static struct platform_driver cht_int33fe_driver = {
133	.driver	= {
134		.name = "Intel Cherry Trail ACPI INT33FE driver",
135		.acpi_match_table = ACPI_PTR(cht_int33fe_acpi_ids),
136	},
137	.probe = cht_int33fe_probe,
138	.remove = cht_int33fe_remove,
139};
140
141module_platform_driver(cht_int33fe_driver);
142
143MODULE_DESCRIPTION("Intel Cherry Trail ACPI INT33FE pseudo device driver");
144MODULE_AUTHOR("Yauhen Kharuzhy <jekhor@gmail.com>");
145MODULE_LICENSE("GPL v2");