Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-module-and-param
[linux-2.6] / drivers / hid / 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/hid.h>
25 #include <linux/input.h>
26 #include <linux/usb.h>
27
28 #include "hid-ids.h"
29
30 #include "usbhid/usbhid.h"
31
32 struct zpff_device {
33         struct hid_report *report;
34 };
35
36 static int zpff_play(struct input_dev *dev, void *data,
37                          struct ff_effect *effect)
38 {
39         struct hid_device *hid = input_get_drvdata(dev);
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         dbg_hid("called with 0x%04x 0x%04x\n", 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         dbg_hid("running with 0x%02x 0x%02x\n", left, right);
59         usbhid_submit_report(hid, zpff->report, USB_DIR_OUT);
60
61         return 0;
62 }
63
64 static int 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                 dev_err(&hid->dev, "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                 dev_err(&hid->dev, "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, 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         usbhid_submit_report(hid, zpff->report, USB_DIR_OUT);
105
106         dev_info(&hid->dev, "force feedback for Zeroplus based devices by "
107                "Anssi Hannula <anssi.hannula@gmail.com>\n");
108
109         return 0;
110 }
111
112 static int zp_probe(struct hid_device *hdev, const struct hid_device_id *id)
113 {
114         int ret;
115
116         ret = hid_parse(hdev);
117         if (ret) {
118                 dev_err(&hdev->dev, "parse failed\n");
119                 goto err;
120         }
121
122         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
123         if (ret) {
124                 dev_err(&hdev->dev, "hw start failed\n");
125                 goto err;
126         }
127
128         zpff_init(hdev);
129
130         return 0;
131 err:
132         return ret;
133 }
134
135 static const struct hid_device_id zp_devices[] = {
136         { HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0005) },
137         { HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0030) },
138         { }
139 };
140 MODULE_DEVICE_TABLE(hid, zp_devices);
141
142 static struct hid_driver zp_driver = {
143         .name = "zeroplus",
144         .id_table = zp_devices,
145         .probe = zp_probe,
146 };
147
148 static int zp_init(void)
149 {
150         return hid_register_driver(&zp_driver);
151 }
152
153 static void zp_exit(void)
154 {
155         hid_unregister_driver(&zp_driver);
156 }
157
158 module_init(zp_init);
159 module_exit(zp_exit);
160 MODULE_LICENSE("GPL");