Merge branch 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6
[pandora-kernel.git] / drivers / usb / input / 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 /* #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 <linux/hid.h>
31 #include "usbhid.h"
32
33 struct zpff_device {
34         struct hid_report *report;
35 };
36
37 static int hid_zpff_play(struct input_dev *dev, void *data,
38                          struct ff_effect *effect)
39 {
40         struct hid_device *hid = dev->private;
41         struct zpff_device *zpff = data;
42         int left, right;
43
44         /*
45          * The following is specified the other way around in the Zeroplus
46          * datasheet but the order below is correct for the XFX Executioner;
47          * however it is possible that the XFX Executioner is an exception
48          */
49
50         left = effect->u.rumble.strong_magnitude;
51         right = effect->u.rumble.weak_magnitude;
52         debug("called with 0x%04x 0x%04x", left, right);
53
54         left = left * 0x7f / 0xffff;
55         right = right * 0x7f / 0xffff;
56
57         zpff->report->field[2]->value[0] = left;
58         zpff->report->field[3]->value[0] = right;
59         debug("running with 0x%02x 0x%02x", left, right);
60         usbhid_submit_report(hid, zpff->report, USB_DIR_OUT);
61
62         return 0;
63 }
64
65 int hid_zpff_init(struct hid_device *hid)
66 {
67         struct zpff_device *zpff;
68         struct hid_report *report;
69         struct hid_input *hidinput = list_entry(hid->inputs.next,
70                                                 struct hid_input, list);
71         struct list_head *report_list =
72                         &hid->report_enum[HID_OUTPUT_REPORT].report_list;
73         struct input_dev *dev = hidinput->input;
74         int error;
75
76         if (list_empty(report_list)) {
77                 printk(KERN_ERR "hid-zpff: no output report found\n");
78                 return -ENODEV;
79         }
80
81         report = list_entry(report_list->next, struct hid_report, list);
82
83         if (report->maxfield < 4) {
84                 printk(KERN_ERR "hid-zpff: not enough fields in report\n");
85                 return -ENODEV;
86         }
87
88         zpff = kzalloc(sizeof(struct zpff_device), GFP_KERNEL);
89         if (!zpff)
90                 return -ENOMEM;
91
92         set_bit(FF_RUMBLE, dev->ffbit);
93
94         error = input_ff_create_memless(dev, zpff, hid_zpff_play);
95         if (error) {
96                 kfree(zpff);
97                 return error;
98         }
99
100         zpff->report = report;
101         zpff->report->field[0]->value[0] = 0x00;
102         zpff->report->field[1]->value[0] = 0x02;
103         zpff->report->field[2]->value[0] = 0x00;
104         zpff->report->field[3]->value[0] = 0x00;
105         usbhid_submit_report(hid, zpff->report, USB_DIR_OUT);
106
107         printk(KERN_INFO "Force feedback for Zeroplus based devices by "
108                "Anssi Hannula <anssi.hannula@gmail.com>\n");
109
110         return 0;
111 }