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
cht_int33fe_check_hw_type(struct device * dev)19 static int cht_int33fe_check_hw_type(struct device *dev)
20 {
21 unsigned long long ptyp;
22 acpi_status status;
23 int ret;
24
25 status = acpi_evaluate_integer(ACPI_HANDLE(dev), "PTYP", NULL, &ptyp);
26 if (ACPI_FAILURE(status)) {
27 dev_err(dev, "Error getting PTYPE\n");
28 return -ENODEV;
29 }
30
31 /*
32 * The same ACPI HID is used for different configurations check PTYP
33 * to ensure that we are dealing with the expected config.
34 */
35 if (ptyp != EXPECTED_PTYPE)
36 return -ENODEV;
37
38 /* Check presence of INT34D3 (hardware-rev 3) expected for ptype == 4 */
39 if (!acpi_dev_present("INT34D3", "1", 3)) {
40 dev_err(dev, "Error PTYPE == %d, but no INT34D3 device\n",
41 EXPECTED_PTYPE);
42 return -ENODEV;
43 }
44
45 ret = i2c_acpi_client_count(ACPI_COMPANION(dev));
46 if (ret < 0)
47 return ret;
48
49 switch (ret) {
50 case 2:
51 return INT33FE_HW_MICROB;
52 case 4:
53 return INT33FE_HW_TYPEC;
54 default:
55 return -ENODEV;
56 }
57 }
58
cht_int33fe_probe(struct platform_device * pdev)59 static int cht_int33fe_probe(struct platform_device *pdev)
60 {
61 struct cht_int33fe_data *data;
62 struct device *dev = &pdev->dev;
63 int ret;
64
65 ret = cht_int33fe_check_hw_type(dev);
66 if (ret < 0)
67 return ret;
68
69 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
70 if (!data)
71 return -ENOMEM;
72
73 data->dev = dev;
74
75 switch (ret) {
76 case INT33FE_HW_MICROB:
77 data->probe = cht_int33fe_microb_probe;
78 data->remove = cht_int33fe_microb_remove;
79 break;
80
81 case INT33FE_HW_TYPEC:
82 data->probe = cht_int33fe_typec_probe;
83 data->remove = cht_int33fe_typec_remove;
84 break;
85 }
86
87 platform_set_drvdata(pdev, data);
88
89 return data->probe(data);
90 }
91
cht_int33fe_remove(struct platform_device * pdev)92 static int cht_int33fe_remove(struct platform_device *pdev)
93 {
94 struct cht_int33fe_data *data = platform_get_drvdata(pdev);
95
96 return data->remove(data);
97 }
98
99 static const struct acpi_device_id cht_int33fe_acpi_ids[] = {
100 { "INT33FE", },
101 { }
102 };
103 MODULE_DEVICE_TABLE(acpi, cht_int33fe_acpi_ids);
104
105 static struct platform_driver cht_int33fe_driver = {
106 .driver = {
107 .name = "Intel Cherry Trail ACPI INT33FE driver",
108 .acpi_match_table = ACPI_PTR(cht_int33fe_acpi_ids),
109 },
110 .probe = cht_int33fe_probe,
111 .remove = cht_int33fe_remove,
112 };
113
114 module_platform_driver(cht_int33fe_driver);
115
116 MODULE_DESCRIPTION("Intel Cherry Trail ACPI INT33FE pseudo device driver");
117 MODULE_AUTHOR("Yauhen Kharuzhy <jekhor@gmail.com>");
118 MODULE_LICENSE("GPL v2");
119