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1 | /* |
2 | * Force feedback support for Zeroplus based devices | |
3 | * | |
4 | * Copyright (c) 2005, 2006 Anssi Hannula <anssi.hannula@gmail.com> | |
5 | */ | |
6 | ||
7 | /* | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | */ | |
22 | ||
23 | ||
24 | /* #define DEBUG */ | |
25 | ||
26 | #define debug(format, arg...) pr_debug("hid-zpff: " format "\n" , ## arg) | |
27 | ||
28 | #include <linux/input.h> | |
29 | #include <linux/usb.h> | |
30 | #include "hid.h" | |
31 | ||
32 | struct zpff_device { | |
33 | struct hid_report *report; | |
34 | }; | |
35 | ||
36 | static int hid_zpff_play(struct input_dev *dev, void *data, | |
37 | struct ff_effect *effect) | |
38 | { | |
39 | struct hid_device *hid = dev->private; | |
40 | struct zpff_device *zpff = data; | |
41 | int left, right; | |
42 | ||
43 | /* | |
44 | * The following is specified the other way around in the Zeroplus | |
45 | * datasheet but the order below is correct for the XFX Executioner; | |
46 | * however it is possible that the XFX Executioner is an exception | |
47 | */ | |
48 | ||
49 | left = effect->u.rumble.strong_magnitude; | |
50 | right = effect->u.rumble.weak_magnitude; | |
51 | debug("called with 0x%04x 0x%04x", left, right); | |
52 | ||
53 | left = left * 0x7f / 0xffff; | |
54 | right = right * 0x7f / 0xffff; | |
55 | ||
56 | zpff->report->field[2]->value[0] = left; | |
57 | zpff->report->field[3]->value[0] = right; | |
58 | debug("running with 0x%02x 0x%02x", left, right); | |
59 | hid_submit_report(hid, zpff->report, USB_DIR_OUT); | |
60 | ||
61 | return 0; | |
62 | } | |
63 | ||
64 | int hid_zpff_init(struct hid_device *hid) | |
65 | { | |
66 | struct zpff_device *zpff; | |
67 | struct hid_report *report; | |
68 | struct hid_input *hidinput = list_entry(hid->inputs.next, | |
69 | struct hid_input, list); | |
70 | struct list_head *report_list = | |
71 | &hid->report_enum[HID_OUTPUT_REPORT].report_list; | |
72 | struct input_dev *dev = hidinput->input; | |
73 | int error; | |
74 | ||
75 | if (list_empty(report_list)) { | |
76 | printk(KERN_ERR "hid-zpff: no output report found\n"); | |
77 | return -ENODEV; | |
78 | } | |
79 | ||
80 | report = list_entry(report_list->next, struct hid_report, list); | |
81 | ||
82 | if (report->maxfield < 4) { | |
83 | printk(KERN_ERR "hid-zpff: not enough fields in report\n"); | |
84 | return -ENODEV; | |
85 | } | |
86 | ||
87 | zpff = kzalloc(sizeof(struct zpff_device), GFP_KERNEL); | |
88 | if (!zpff) | |
89 | return -ENOMEM; | |
90 | ||
91 | set_bit(FF_RUMBLE, dev->ffbit); | |
92 | ||
93 | error = input_ff_create_memless(dev, zpff, hid_zpff_play); | |
94 | if (error) { | |
95 | kfree(zpff); | |
96 | return error; | |
97 | } | |
98 | ||
99 | zpff->report = report; | |
100 | zpff->report->field[0]->value[0] = 0x00; | |
101 | zpff->report->field[1]->value[0] = 0x02; | |
102 | zpff->report->field[2]->value[0] = 0x00; | |
103 | zpff->report->field[3]->value[0] = 0x00; | |
104 | hid_submit_report(hid, zpff->report, USB_DIR_OUT); | |
105 | ||
106 | printk(KERN_INFO "Force feedback for Zeroplus based devices by " | |
107 | "Anssi Hannula <anssi.hannula@gmail.com>\n"); | |
108 | ||
109 | return 0; | |
110 | } |