fbmem: don't allow too huge resolutions
[linux-2.6-microblaze.git] / drivers / hid / hid-lg2ff.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  Force feedback support for Logitech RumblePad and Rumblepad 2
4  *
5  *  Copyright (c) 2008 Anssi Hannula <anssi.hannula@gmail.com>
6  */
7
8 /*
9  */
10
11
12 #include <linux/input.h>
13 #include <linux/slab.h>
14 #include <linux/hid.h>
15
16 #include "hid-lg.h"
17
18 struct lg2ff_device {
19         struct hid_report *report;
20 };
21
22 static int play_effect(struct input_dev *dev, void *data,
23                          struct ff_effect *effect)
24 {
25         struct hid_device *hid = input_get_drvdata(dev);
26         struct lg2ff_device *lg2ff = data;
27         int weak, strong;
28
29         strong = effect->u.rumble.strong_magnitude;
30         weak = effect->u.rumble.weak_magnitude;
31
32         if (weak || strong) {
33                 weak = weak * 0xff / 0xffff;
34                 strong = strong * 0xff / 0xffff;
35
36                 lg2ff->report->field[0]->value[0] = 0x51;
37                 lg2ff->report->field[0]->value[2] = weak;
38                 lg2ff->report->field[0]->value[4] = strong;
39         } else {
40                 lg2ff->report->field[0]->value[0] = 0xf3;
41                 lg2ff->report->field[0]->value[2] = 0x00;
42                 lg2ff->report->field[0]->value[4] = 0x00;
43         }
44
45         hid_hw_request(hid, lg2ff->report, HID_REQ_SET_REPORT);
46         return 0;
47 }
48
49 int lg2ff_init(struct hid_device *hid)
50 {
51         struct lg2ff_device *lg2ff;
52         struct hid_report *report;
53         struct hid_input *hidinput;
54         struct input_dev *dev;
55         int error;
56
57         if (list_empty(&hid->inputs)) {
58                 hid_err(hid, "no inputs found\n");
59                 return -ENODEV;
60         }
61         hidinput = list_entry(hid->inputs.next, struct hid_input, list);
62         dev = hidinput->input;
63
64         /* Check that the report looks ok */
65         report = hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 7);
66         if (!report)
67                 return -ENODEV;
68
69         lg2ff = kmalloc(sizeof(struct lg2ff_device), GFP_KERNEL);
70         if (!lg2ff)
71                 return -ENOMEM;
72
73         set_bit(FF_RUMBLE, dev->ffbit);
74
75         error = input_ff_create_memless(dev, lg2ff, play_effect);
76         if (error) {
77                 kfree(lg2ff);
78                 return error;
79         }
80
81         lg2ff->report = report;
82         report->field[0]->value[0] = 0xf3;
83         report->field[0]->value[1] = 0x00;
84         report->field[0]->value[2] = 0x00;
85         report->field[0]->value[3] = 0x00;
86         report->field[0]->value[4] = 0x00;
87         report->field[0]->value[5] = 0x00;
88         report->field[0]->value[6] = 0x00;
89
90         hid_hw_request(hid, report, HID_REQ_SET_REPORT);
91
92         hid_info(hid, "Force feedback for Logitech variant 2 rumble devices by Anssi Hannula <anssi.hannula@gmail.com>\n");
93
94         return 0;
95 }