1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * HID driver for some ITE "special" devices
4  * Copyright (c) 2017 Hans de Goede <hdegoede@redhat.com>
5  */
6 
7 #include <linux/device.h>
8 #include <linux/input.h>
9 #include <linux/hid.h>
10 #include <linux/module.h>
11 
12 #include "hid-ids.h"
13 
14 #define QUIRK_TOUCHPAD_ON_OFF_REPORT		BIT(0)
15 
ite_report_fixup(struct hid_device * hdev,__u8 * rdesc,unsigned int * rsize)16 static __u8 *ite_report_fixup(struct hid_device *hdev, __u8 *rdesc, unsigned int *rsize)
17 {
18 	unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
19 
20 	if (quirks & QUIRK_TOUCHPAD_ON_OFF_REPORT) {
21 		/* For Acer Aspire Switch 10 SW5-012 keyboard-dock */
22 		if (*rsize == 188 && rdesc[162] == 0x81 && rdesc[163] == 0x02) {
23 			hid_info(hdev, "Fixing up Acer Sw5-012 ITE keyboard report descriptor\n");
24 			rdesc[163] = HID_MAIN_ITEM_RELATIVE;
25 		}
26 		/* For Acer One S1002/S1003 keyboard-dock */
27 		if (*rsize == 188 && rdesc[185] == 0x81 && rdesc[186] == 0x02) {
28 			hid_info(hdev, "Fixing up Acer S1002/S1003 ITE keyboard report descriptor\n");
29 			rdesc[186] = HID_MAIN_ITEM_RELATIVE;
30 		}
31 		/* For Acer Aspire Switch 10E (SW3-016) keyboard-dock */
32 		if (*rsize == 210 && rdesc[184] == 0x81 && rdesc[185] == 0x02) {
33 			hid_info(hdev, "Fixing up Acer Aspire Switch 10E (SW3-016) ITE keyboard report descriptor\n");
34 			rdesc[185] = HID_MAIN_ITEM_RELATIVE;
35 		}
36 	}
37 
38 	return rdesc;
39 }
40 
ite_input_mapping(struct hid_device * hdev,struct hid_input * hi,struct hid_field * field,struct hid_usage * usage,unsigned long ** bit,int * max)41 static int ite_input_mapping(struct hid_device *hdev,
42 		struct hid_input *hi, struct hid_field *field,
43 		struct hid_usage *usage, unsigned long **bit,
44 		int *max)
45 {
46 
47 	unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
48 
49 	if ((quirks & QUIRK_TOUCHPAD_ON_OFF_REPORT) &&
50 	    (usage->hid & HID_USAGE_PAGE) == 0x00880000) {
51 		if (usage->hid == 0x00880078) {
52 			/* Touchpad on, userspace expects F22 for this */
53 			hid_map_usage_clear(hi, usage, bit, max, EV_KEY, KEY_F22);
54 			return 1;
55 		}
56 		if (usage->hid == 0x00880079) {
57 			/* Touchpad off, userspace expects F23 for this */
58 			hid_map_usage_clear(hi, usage, bit, max, EV_KEY, KEY_F23);
59 			return 1;
60 		}
61 		return -1;
62 	}
63 
64 	return 0;
65 }
66 
ite_event(struct hid_device * hdev,struct hid_field * field,struct hid_usage * usage,__s32 value)67 static int ite_event(struct hid_device *hdev, struct hid_field *field,
68 		     struct hid_usage *usage, __s32 value)
69 {
70 	struct input_dev *input;
71 
72 	if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput)
73 		return 0;
74 
75 	input = field->hidinput->input;
76 
77 	/*
78 	 * The ITE8595 always reports 0 as value for the rfkill button. Luckily
79 	 * it is the only button in its report, and it sends a report on
80 	 * release only, so receiving a report means the button was pressed.
81 	 */
82 	if (usage->hid == HID_GD_RFKILL_BTN) {
83 		input_event(input, EV_KEY, KEY_RFKILL, 1);
84 		input_sync(input);
85 		input_event(input, EV_KEY, KEY_RFKILL, 0);
86 		input_sync(input);
87 		return 1;
88 	}
89 
90 	return 0;
91 }
92 
ite_probe(struct hid_device * hdev,const struct hid_device_id * id)93 static int ite_probe(struct hid_device *hdev, const struct hid_device_id *id)
94 {
95 	int ret;
96 
97 	hid_set_drvdata(hdev, (void *)id->driver_data);
98 
99 	ret = hid_open_report(hdev);
100 	if (ret)
101 		return ret;
102 
103 	return hid_hw_start(hdev, HID_CONNECT_DEFAULT);
104 }
105 
106 static const struct hid_device_id ite_devices[] = {
107 	{ HID_USB_DEVICE(USB_VENDOR_ID_ITE, USB_DEVICE_ID_ITE8595) },
108 	{ HID_USB_DEVICE(USB_VENDOR_ID_258A, USB_DEVICE_ID_258A_6A88) },
109 	/* ITE8595 USB kbd ctlr, with Synaptics touchpad connected to it. */
110 	{ HID_DEVICE(BUS_USB, HID_GROUP_GENERIC,
111 		     USB_VENDOR_ID_SYNAPTICS,
112 		     USB_DEVICE_ID_SYNAPTICS_ACER_SWITCH5_012),
113 	  .driver_data = QUIRK_TOUCHPAD_ON_OFF_REPORT },
114 	/* ITE8910 USB kbd ctlr, with Synaptics touchpad connected to it. */
115 	{ HID_DEVICE(BUS_USB, HID_GROUP_GENERIC,
116 		     USB_VENDOR_ID_SYNAPTICS,
117 		     USB_DEVICE_ID_SYNAPTICS_ACER_ONE_S1002),
118 	  .driver_data = QUIRK_TOUCHPAD_ON_OFF_REPORT },
119 	/* ITE8910 USB kbd ctlr, with Synaptics touchpad connected to it. */
120 	{ HID_DEVICE(BUS_USB, HID_GROUP_GENERIC,
121 		     USB_VENDOR_ID_SYNAPTICS,
122 		     USB_DEVICE_ID_SYNAPTICS_ACER_ONE_S1003),
123 	  .driver_data = QUIRK_TOUCHPAD_ON_OFF_REPORT },
124 	/* ITE8910 USB kbd ctlr, with Synaptics touchpad connected to it. */
125 	{ HID_DEVICE(BUS_USB, HID_GROUP_GENERIC,
126 		     USB_VENDOR_ID_SYNAPTICS,
127 		     USB_DEVICE_ID_SYNAPTICS_ACER_SWITCH5_017),
128 	  .driver_data = QUIRK_TOUCHPAD_ON_OFF_REPORT },
129 	{ }
130 };
131 MODULE_DEVICE_TABLE(hid, ite_devices);
132 
133 static struct hid_driver ite_driver = {
134 	.name = "itetech",
135 	.id_table = ite_devices,
136 	.probe = ite_probe,
137 	.report_fixup = ite_report_fixup,
138 	.input_mapping = ite_input_mapping,
139 	.event = ite_event,
140 };
141 module_hid_driver(ite_driver);
142 
143 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
144 MODULE_LICENSE("GPL");
145