Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux...
[linux-2.6] / drivers / hid / usbhid / hid-zpff.c
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 #include <linux/input.h>
25 #include <linux/usb.h>
26 #include <linux/hid.h>
27 #include "usbhid.h"
28
29 struct zpff_device {
30         struct hid_report *report;
31 };
32
33 static int hid_zpff_play(struct input_dev *dev, void *data,
34                          struct ff_effect *effect)
35 {
36         struct hid_device *hid = input_get_drvdata(dev);
37         struct zpff_device *zpff = data;
38         int left, right;
39
40         /*
41          * The following is specified the other way around in the Zeroplus
42          * datasheet but the order below is correct for the XFX Executioner;
43          * however it is possible that the XFX Executioner is an exception
44          */
45
46         left = effect->u.rumble.strong_magnitude;
47         right = effect->u.rumble.weak_magnitude;
48         dbg_hid("called with 0x%04x 0x%04x\n", left, right);
49
50         left = left * 0x7f / 0xffff;
51         right = right * 0x7f / 0xffff;
52
53         zpff->report->field[2]->value[0] = left;
54         zpff->report->field[3]->value[0] = right;
55         dbg_hid("running with 0x%02x 0x%02x\n", left, right);
56         usbhid_submit_report(hid, zpff->report, USB_DIR_OUT);
57
58         return 0;
59 }
60
61 int hid_zpff_init(struct hid_device *hid)
62 {
63         struct zpff_device *zpff;
64         struct hid_report *report;
65         struct hid_input *hidinput = list_entry(hid->inputs.next,
66                                                 struct hid_input, list);
67         struct list_head *report_list =
68                         &hid->report_enum[HID_OUTPUT_REPORT].report_list;
69         struct input_dev *dev = hidinput->input;
70         int error;
71
72         if (list_empty(report_list)) {
73                 printk(KERN_ERR "hid-zpff: no output report found\n");
74                 return -ENODEV;
75         }
76
77         report = list_entry(report_list->next, struct hid_report, list);
78
79         if (report->maxfield < 4) {
80                 printk(KERN_ERR "hid-zpff: not enough fields in report\n");
81                 return -ENODEV;
82         }
83
84         zpff = kzalloc(sizeof(struct zpff_device), GFP_KERNEL);
85         if (!zpff)
86                 return -ENOMEM;
87
88         set_bit(FF_RUMBLE, dev->ffbit);
89
90         error = input_ff_create_memless(dev, zpff, hid_zpff_play);
91         if (error) {
92                 kfree(zpff);
93                 return error;
94         }
95
96         zpff->report = report;
97         zpff->report->field[0]->value[0] = 0x00;
98         zpff->report->field[1]->value[0] = 0x02;
99         zpff->report->field[2]->value[0] = 0x00;
100         zpff->report->field[3]->value[0] = 0x00;
101         usbhid_submit_report(hid, zpff->report, USB_DIR_OUT);
102
103         printk(KERN_INFO "Force feedback for Zeroplus based devices by "
104                "Anssi Hannula <anssi.hannula@gmail.com>\n");
105
106         return 0;
107 }