xref: /openbmc/linux/drivers/hid/hid-gaff.c (revision d9d4b1e4)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  Force feedback support for GreenAsia (Product ID 0x12) based devices
4  *
5  *  The devices are distributed under various names and the same USB device ID
6  *  can be used in many game controllers.
7  *
8  *  0e8f:0012 "GreenAsia Inc.    USB Joystick     "
9  *   - tested with MANTA Warior MM816 and SpeedLink Strike2 SL-6635.
10  *
11  *  Copyright (c) 2008 Lukasz Lubojanski <lukasz@lubojanski.info>
12  */
13 
14 /*
15  */
16 
17 #include <linux/input.h>
18 #include <linux/slab.h>
19 #include <linux/hid.h>
20 #include <linux/module.h>
21 #include "hid-ids.h"
22 
23 #ifdef CONFIG_GREENASIA_FF
24 
25 struct gaff_device {
26 	struct hid_report *report;
27 };
28 
hid_gaff_play(struct input_dev * dev,void * data,struct ff_effect * effect)29 static int hid_gaff_play(struct input_dev *dev, void *data,
30 			 struct ff_effect *effect)
31 {
32 	struct hid_device *hid = input_get_drvdata(dev);
33 	struct gaff_device *gaff = data;
34 	int left, right;
35 
36 	left = effect->u.rumble.strong_magnitude;
37 	right = effect->u.rumble.weak_magnitude;
38 
39 	dbg_hid("called with 0x%04x 0x%04x", left, right);
40 
41 	left = left * 0xfe / 0xffff;
42 	right = right * 0xfe / 0xffff;
43 
44 	gaff->report->field[0]->value[0] = 0x51;
45 	gaff->report->field[0]->value[1] = 0x0;
46 	gaff->report->field[0]->value[2] = right;
47 	gaff->report->field[0]->value[3] = 0;
48 	gaff->report->field[0]->value[4] = left;
49 	gaff->report->field[0]->value[5] = 0;
50 	dbg_hid("running with 0x%02x 0x%02x", left, right);
51 	hid_hw_request(hid, gaff->report, HID_REQ_SET_REPORT);
52 
53 	gaff->report->field[0]->value[0] = 0xfa;
54 	gaff->report->field[0]->value[1] = 0xfe;
55 	gaff->report->field[0]->value[2] = 0x0;
56 	gaff->report->field[0]->value[4] = 0x0;
57 
58 	hid_hw_request(hid, gaff->report, HID_REQ_SET_REPORT);
59 
60 	return 0;
61 }
62 
gaff_init(struct hid_device * hid)63 static int gaff_init(struct hid_device *hid)
64 {
65 	struct gaff_device *gaff;
66 	struct hid_report *report;
67 	struct hid_input *hidinput;
68 	struct list_head *report_list =
69 			&hid->report_enum[HID_OUTPUT_REPORT].report_list;
70 	struct list_head *report_ptr = report_list;
71 	struct input_dev *dev;
72 	int error;
73 
74 	if (list_empty(&hid->inputs)) {
75 		hid_err(hid, "no inputs found\n");
76 		return -ENODEV;
77 	}
78 	hidinput = list_entry(hid->inputs.next, struct hid_input, list);
79 	dev = hidinput->input;
80 
81 	if (list_empty(report_list)) {
82 		hid_err(hid, "no output reports found\n");
83 		return -ENODEV;
84 	}
85 
86 	report_ptr = report_ptr->next;
87 
88 	report = list_entry(report_ptr, struct hid_report, list);
89 	if (report->maxfield < 1) {
90 		hid_err(hid, "no fields in the report\n");
91 		return -ENODEV;
92 	}
93 
94 	if (report->field[0]->report_count < 6) {
95 		hid_err(hid, "not enough values in the field\n");
96 		return -ENODEV;
97 	}
98 
99 	gaff = kzalloc(sizeof(struct gaff_device), GFP_KERNEL);
100 	if (!gaff)
101 		return -ENOMEM;
102 
103 	set_bit(FF_RUMBLE, dev->ffbit);
104 
105 	error = input_ff_create_memless(dev, gaff, hid_gaff_play);
106 	if (error) {
107 		kfree(gaff);
108 		return error;
109 	}
110 
111 	gaff->report = report;
112 	gaff->report->field[0]->value[0] = 0x51;
113 	gaff->report->field[0]->value[1] = 0x00;
114 	gaff->report->field[0]->value[2] = 0x00;
115 	gaff->report->field[0]->value[3] = 0x00;
116 	hid_hw_request(hid, gaff->report, HID_REQ_SET_REPORT);
117 
118 	gaff->report->field[0]->value[0] = 0xfa;
119 	gaff->report->field[0]->value[1] = 0xfe;
120 
121 	hid_hw_request(hid, gaff->report, HID_REQ_SET_REPORT);
122 
123 	hid_info(hid, "Force Feedback for GreenAsia 0x12 devices by Lukasz Lubojanski <lukasz@lubojanski.info>\n");
124 
125 	return 0;
126 }
127 #else
gaff_init(struct hid_device * hdev)128 static inline int gaff_init(struct hid_device *hdev)
129 {
130 	return 0;
131 }
132 #endif
133 
ga_probe(struct hid_device * hdev,const struct hid_device_id * id)134 static int ga_probe(struct hid_device *hdev, const struct hid_device_id *id)
135 {
136 	int ret;
137 
138 	dev_dbg(&hdev->dev, "Greenasia HID hardware probe...");
139 
140 	ret = hid_parse(hdev);
141 	if (ret) {
142 		hid_err(hdev, "parse failed\n");
143 		goto err;
144 	}
145 
146 	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
147 	if (ret) {
148 		hid_err(hdev, "hw start failed\n");
149 		goto err;
150 	}
151 
152 	gaff_init(hdev);
153 
154 	return 0;
155 err:
156 	return ret;
157 }
158 
159 static const struct hid_device_id ga_devices[] = {
160 	{ HID_USB_DEVICE(USB_VENDOR_ID_GREENASIA, 0x0012),  },
161 	{ }
162 };
163 MODULE_DEVICE_TABLE(hid, ga_devices);
164 
165 static struct hid_driver ga_driver = {
166 	.name = "greenasia",
167 	.id_table = ga_devices,
168 	.probe = ga_probe,
169 };
170 module_hid_driver(ga_driver);
171 
172 MODULE_LICENSE("GPL");
173