HID: fix hid->hiddev initialization in hiddev_connect()
[linux-2.6.git] / drivers / hid / hid-gaff.c
1 /*
2  *  Force feedback support for GreenAsia (Product ID 0x12) based devices
3  *
4  *  The devices are distributed under various names and the same USB device ID
5  *  can be used in many game controllers.
6  *
7  *
8  *  0e8f:0012 "GreenAsia Inc.    USB Joystick     "
9  *   - tested with MANTA Warior MM816 and SpeedLink Strike2 SL-6635.
10  *
11  *  Copyright (c) 2008 Lukasz Lubojanski <lukasz@lubojanski.info>
12  */
13
14 /*
15  * This program is free software; you can redistribute it and/or modify
16  * it under the terms of the GNU General Public License as published by
17  * the Free Software Foundation; either version 2 of the License, or
18  * (at your option) any later version.
19  *
20  * This program is distributed in the hope that it will be useful,
21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
23  * GNU General Public License for more details.
24  *
25  * You should have received a copy of the GNU General Public License
26  * along with this program; if not, write to the Free Software
27  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28  */
29
30 #include <linux/input.h>
31 #include <linux/usb.h>
32 #include <linux/hid.h>
33 #include "hid-ids.h"
34 #include "usbhid/usbhid.h"
35
36 struct gaff_device {
37         struct hid_report *report;
38 };
39
40 static int hid_gaff_play(struct input_dev *dev, void *data,
41                          struct ff_effect *effect)
42 {
43         struct hid_device *hid = input_get_drvdata(dev);
44         struct gaff_device *gaff = data;
45         int left, right;
46
47         left = effect->u.rumble.strong_magnitude;
48         right = effect->u.rumble.weak_magnitude;
49
50         dbg_hid("called with 0x%04x 0x%04x", left, right);
51
52         left = left * 0xfe / 0xffff;
53         right = right * 0xfe / 0xffff;
54
55         gaff->report->field[0]->value[0] = 0x51;
56         gaff->report->field[0]->value[1] = 0x0;
57         gaff->report->field[0]->value[2] = right;
58         gaff->report->field[0]->value[3] = 0;
59         gaff->report->field[0]->value[4] = left;
60         gaff->report->field[0]->value[5] = 0;
61         dbg_hid("running with 0x%02x 0x%02x", left, right);
62         usbhid_submit_report(hid, gaff->report, USB_DIR_OUT);
63
64         gaff->report->field[0]->value[0] = 0xfa;
65         gaff->report->field[0]->value[1] = 0xfe;
66         gaff->report->field[0]->value[2] = 0x0;
67         gaff->report->field[0]->value[4] = 0x0;
68
69         usbhid_submit_report(hid, gaff->report, USB_DIR_OUT);
70
71         return 0;
72 }
73
74 static int gaff_init(struct hid_device *hid)
75 {
76         struct gaff_device *gaff;
77         struct hid_report *report;
78         struct hid_input *hidinput = list_entry(hid->inputs.next,
79                                                 struct hid_input, list);
80         struct list_head *report_list =
81                         &hid->report_enum[HID_OUTPUT_REPORT].report_list;
82         struct list_head *report_ptr = report_list;
83         struct input_dev *dev = hidinput->input;
84         int error;
85
86         if (list_empty(report_list)) {
87                 dev_err(&hid->dev, "no output reports found\n");
88                 return -ENODEV;
89         }
90
91         report_ptr = report_ptr->next;
92
93         report = list_entry(report_ptr, struct hid_report, list);
94         if (report->maxfield < 1) {
95                 dev_err(&hid->dev, "no fields in the report\n");
96                 return -ENODEV;
97         }
98
99         if (report->field[0]->report_count < 6) {
100                 dev_err(&hid->dev, "not enough values in the field\n");
101                 return -ENODEV;
102         }
103
104         gaff = kzalloc(sizeof(struct gaff_device), GFP_KERNEL);
105         if (!gaff)
106                 return -ENOMEM;
107
108         set_bit(FF_RUMBLE, dev->ffbit);
109
110         error = input_ff_create_memless(dev, gaff, hid_gaff_play);
111         if (error) {
112                 kfree(gaff);
113                 return error;
114         }
115
116         gaff->report = report;
117         gaff->report->field[0]->value[0] = 0x51;
118         gaff->report->field[0]->value[1] = 0x00;
119         gaff->report->field[0]->value[2] = 0x00;
120         gaff->report->field[0]->value[3] = 0x00;
121         usbhid_submit_report(hid, gaff->report, USB_DIR_OUT);
122
123         gaff->report->field[0]->value[0] = 0xfa;
124         gaff->report->field[0]->value[1] = 0xfe;
125
126         usbhid_submit_report(hid, gaff->report, USB_DIR_OUT);
127
128         dev_info(&hid->dev, "Force Feedback for GreenAsia 0x12"
129                " devices by Lukasz Lubojanski <lukasz@lubojanski.info>\n");
130
131         return 0;
132 }
133
134 static int ga_probe(struct hid_device *hdev, const struct hid_device_id *id)
135 {
136         int ret;
137
138         dev_dbg(&hdev->dev, "Greenasia HID hardware probe...");
139
140         ret = hid_parse(hdev);
141         if (ret) {
142                 dev_err(&hdev->dev, "parse failed\n");
143                 goto err;
144         }
145
146         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
147         if (ret) {
148                 dev_err(&hdev->dev, "hw start failed\n");
149                 goto err;
150         }
151
152         gaff_init(hdev);
153
154         return 0;
155 err:
156         return ret;
157 }
158
159 static const struct hid_device_id ga_devices[] = {
160         { HID_USB_DEVICE(USB_VENDOR_ID_GREENASIA, 0x0012),  },
161         { }
162 };
163 MODULE_DEVICE_TABLE(hid, ga_devices);
164
165 static struct hid_driver ga_driver = {
166         .name = "greenasia",
167         .id_table = ga_devices,
168         .probe = ga_probe,
169 };
170
171 static int __init ga_init(void)
172 {
173         return hid_register_driver(&ga_driver);
174 }
175
176 static void __exit ga_exit(void)
177 {
178         hid_unregister_driver(&ga_driver);
179 }
180
181 module_init(ga_init);
182 module_exit(ga_exit);
183 MODULE_LICENSE("GPL");
184
185 HID_COMPAT_LOAD_DRIVER(greenasia);