1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Force feedback support for ACRUX game controllers
4  *
5  * From what I have gathered, these devices are mass produced in China
6  * by several vendors. They often share the same design as the original
7  * Xbox 360 controller.
8  *
9  * 1a34:0802 "ACRUX USB GAMEPAD 8116"
10  *  - tested with an EXEQ EQ-PCU-02090 game controller.
11  *
12  * Copyright (c) 2010 Sergei Kolzun <x0r@dv-life.ru>
13  */
14 
15 /*
16  */
17 
18 #include <linux/input.h>
19 #include <linux/slab.h>
20 #include <linux/hid.h>
21 #include <linux/module.h>
22 
23 #include "hid-ids.h"
24 
25 #ifdef CONFIG_HID_ACRUX_FF
26 
27 struct axff_device {
28 	struct hid_report *report;
29 };
30 
axff_play(struct input_dev * dev,void * data,struct ff_effect * effect)31 static int axff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
32 {
33 	struct hid_device *hid = input_get_drvdata(dev);
34 	struct axff_device *axff = data;
35 	struct hid_report *report = axff->report;
36 	int field_count = 0;
37 	int left, right;
38 	int i, j;
39 
40 	left = effect->u.rumble.strong_magnitude;
41 	right = effect->u.rumble.weak_magnitude;
42 
43 	dbg_hid("called with 0x%04x 0x%04x", left, right);
44 
45 	left = left * 0xff / 0xffff;
46 	right = right * 0xff / 0xffff;
47 
48 	for (i = 0; i < report->maxfield; i++) {
49 		for (j = 0; j < report->field[i]->report_count; j++) {
50 			report->field[i]->value[j] =
51 				field_count % 2 ? right : left;
52 			field_count++;
53 		}
54 	}
55 
56 	dbg_hid("running with 0x%02x 0x%02x", left, right);
57 	hid_hw_request(hid, axff->report, HID_REQ_SET_REPORT);
58 
59 	return 0;
60 }
61 
axff_init(struct hid_device * hid)62 static int axff_init(struct hid_device *hid)
63 {
64 	struct axff_device *axff;
65 	struct hid_report *report;
66 	struct hid_input *hidinput;
67 	struct list_head *report_list =&hid->report_enum[HID_OUTPUT_REPORT].report_list;
68 	struct input_dev *dev;
69 	int field_count = 0;
70 	int i, j;
71 	int error;
72 
73 	if (list_empty(&hid->inputs)) {
74 		hid_err(hid, "no inputs found\n");
75 		return -ENODEV;
76 	}
77 	hidinput = list_first_entry(&hid->inputs, struct hid_input, list);
78 	dev = hidinput->input;
79 
80 	if (list_empty(report_list)) {
81 		hid_err(hid, "no output reports found\n");
82 		return -ENODEV;
83 	}
84 
85 	report = list_first_entry(report_list, struct hid_report, list);
86 	for (i = 0; i < report->maxfield; i++) {
87 		for (j = 0; j < report->field[i]->report_count; j++) {
88 			report->field[i]->value[j] = 0x00;
89 			field_count++;
90 		}
91 	}
92 
93 	if (field_count < 4 && hid->product != 0xf705) {
94 		hid_err(hid, "not enough fields in the report: %d\n",
95 			field_count);
96 		return -ENODEV;
97 	}
98 
99 	axff = kzalloc(sizeof(struct axff_device), GFP_KERNEL);
100 	if (!axff)
101 		return -ENOMEM;
102 
103 	set_bit(FF_RUMBLE, dev->ffbit);
104 
105 	error = input_ff_create_memless(dev, axff, axff_play);
106 	if (error)
107 		goto err_free_mem;
108 
109 	axff->report = report;
110 	hid_hw_request(hid, axff->report, HID_REQ_SET_REPORT);
111 
112 	hid_info(hid, "Force Feedback for ACRUX game controllers by Sergei Kolzun <x0r@dv-life.ru>\n");
113 
114 	return 0;
115 
116 err_free_mem:
117 	kfree(axff);
118 	return error;
119 }
120 #else
axff_init(struct hid_device * hid)121 static inline int axff_init(struct hid_device *hid)
122 {
123 	return 0;
124 }
125 #endif
126 
ax_probe(struct hid_device * hdev,const struct hid_device_id * id)127 static int ax_probe(struct hid_device *hdev, const struct hid_device_id *id)
128 {
129 	int error;
130 
131 	dev_dbg(&hdev->dev, "ACRUX HID hardware probe...\n");
132 
133 	error = hid_parse(hdev);
134 	if (error) {
135 		hid_err(hdev, "parse failed\n");
136 		return error;
137 	}
138 
139 	error = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
140 	if (error) {
141 		hid_err(hdev, "hw start failed\n");
142 		return error;
143 	}
144 
145 	error = axff_init(hdev);
146 	if (error) {
147 		/*
148 		 * Do not fail device initialization completely as device
149 		 * may still be partially operable, just warn.
150 		 */
151 		hid_warn(hdev,
152 			 "Failed to enable force feedback support, error: %d\n",
153 			 error);
154 	}
155 
156 	/*
157 	 * We need to start polling device right away, otherwise
158 	 * it will go into a coma.
159 	 */
160 	error = hid_hw_open(hdev);
161 	if (error) {
162 		dev_err(&hdev->dev, "hw open failed\n");
163 		hid_hw_stop(hdev);
164 		return error;
165 	}
166 
167 	return 0;
168 }
169 
ax_remove(struct hid_device * hdev)170 static void ax_remove(struct hid_device *hdev)
171 {
172 	hid_hw_close(hdev);
173 	hid_hw_stop(hdev);
174 }
175 
176 static const struct hid_device_id ax_devices[] = {
177 	{ HID_USB_DEVICE(USB_VENDOR_ID_ACRUX, 0x0802), },
178 	{ HID_USB_DEVICE(USB_VENDOR_ID_ACRUX, 0xf705), },
179 	{ }
180 };
181 MODULE_DEVICE_TABLE(hid, ax_devices);
182 
183 static struct hid_driver ax_driver = {
184 	.name		= "acrux",
185 	.id_table	= ax_devices,
186 	.probe		= ax_probe,
187 	.remove		= ax_remove,
188 };
189 module_hid_driver(ax_driver);
190 
191 MODULE_AUTHOR("Sergei Kolzun");
192 MODULE_DESCRIPTION("Force feedback support for ACRUX game controllers");
193 MODULE_LICENSE("GPL");
194