max2165: trival fix for some -Wuninitialized warning
[pandora-kernel.git] / drivers / hid / hid-axff.c
1 /*
2  * Force feedback support for ACRUX game controllers
3  *
4  * From what I have gathered, these devices are mass produced in China
5  * by several vendors. They often share the same design as the original
6  * Xbox 360 controller.
7  *
8  * 1a34:0802 "ACRUX USB GAMEPAD 8116"
9  *  - tested with an EXEQ EQ-PCU-02090 game controller.
10  *
11  * Copyright (c) 2010 Sergei Kolzun <x0r@dv-life.ru>
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/slab.h>
32 #include <linux/usb.h>
33 #include <linux/hid.h>
34 #include <linux/module.h>
35
36 #include "hid-ids.h"
37
38 #ifdef CONFIG_HID_ACRUX_FF
39 #include "usbhid/usbhid.h"
40
41 struct axff_device {
42         struct hid_report *report;
43 };
44
45 static int axff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
46 {
47         struct hid_device *hid = input_get_drvdata(dev);
48         struct axff_device *axff = data;
49         struct hid_report *report = axff->report;
50         int field_count = 0;
51         int left, right;
52         int i, j;
53
54         left = effect->u.rumble.strong_magnitude;
55         right = effect->u.rumble.weak_magnitude;
56
57         dbg_hid("called with 0x%04x 0x%04x", left, right);
58
59         left = left * 0xff / 0xffff;
60         right = right * 0xff / 0xffff;
61
62         for (i = 0; i < report->maxfield; i++) {
63                 for (j = 0; j < report->field[i]->report_count; j++) {
64                         report->field[i]->value[j] =
65                                 field_count % 2 ? right : left;
66                         field_count++;
67                 }
68         }
69
70         dbg_hid("running with 0x%02x 0x%02x", left, right);
71         usbhid_submit_report(hid, axff->report, USB_DIR_OUT);
72
73         return 0;
74 }
75
76 static int axff_init(struct hid_device *hid)
77 {
78         struct axff_device *axff;
79         struct hid_report *report;
80         struct hid_input *hidinput = list_first_entry(&hid->inputs, struct hid_input, list);
81         struct list_head *report_list =&hid->report_enum[HID_OUTPUT_REPORT].report_list;
82         struct input_dev *dev = hidinput->input;
83         int field_count = 0;
84         int i, j;
85         int error;
86
87         if (list_empty(report_list)) {
88                 hid_err(hid, "no output reports found\n");
89                 return -ENODEV;
90         }
91
92         report = list_first_entry(report_list, struct hid_report, list);
93         for (i = 0; i < report->maxfield; i++) {
94                 for (j = 0; j < report->field[i]->report_count; j++) {
95                         report->field[i]->value[j] = 0x00;
96                         field_count++;
97                 }
98         }
99
100         if (field_count < 4) {
101                 hid_err(hid, "not enough fields in the report: %d\n",
102                         field_count);
103                 return -ENODEV;
104         }
105
106         axff = kzalloc(sizeof(struct axff_device), GFP_KERNEL);
107         if (!axff)
108                 return -ENOMEM;
109
110         set_bit(FF_RUMBLE, dev->ffbit);
111
112         error = input_ff_create_memless(dev, axff, axff_play);
113         if (error)
114                 goto err_free_mem;
115
116         axff->report = report;
117         usbhid_submit_report(hid, axff->report, USB_DIR_OUT);
118
119         hid_info(hid, "Force Feedback for ACRUX game controllers by Sergei Kolzun <x0r@dv-life.ru>\n");
120
121         return 0;
122
123 err_free_mem:
124         kfree(axff);
125         return error;
126 }
127 #else
128 static inline int axff_init(struct hid_device *hid)
129 {
130         return 0;
131 }
132 #endif
133
134 static int ax_probe(struct hid_device *hdev, const struct hid_device_id *id)
135 {
136         int error;
137
138         dev_dbg(&hdev->dev, "ACRUX HID hardware probe...\n");
139
140         error = hid_parse(hdev);
141         if (error) {
142                 hid_err(hdev, "parse failed\n");
143                 return error;
144         }
145
146         error = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
147         if (error) {
148                 hid_err(hdev, "hw start failed\n");
149                 return error;
150         }
151
152         error = axff_init(hdev);
153         if (error) {
154                 /*
155                  * Do not fail device initialization completely as device
156                  * may still be partially operable, just warn.
157                  */
158                 hid_warn(hdev,
159                          "Failed to enable force feedback support, error: %d\n",
160                          error);
161         }
162
163         /*
164          * We need to start polling device right away, otherwise
165          * it will go into a coma.
166          */
167         error = hid_hw_open(hdev);
168         if (error) {
169                 dev_err(&hdev->dev, "hw open failed\n");
170                 hid_hw_stop(hdev);
171                 return error;
172         }
173
174         return 0;
175 }
176
177 static void ax_remove(struct hid_device *hdev)
178 {
179         hid_hw_close(hdev);
180         hid_hw_stop(hdev);
181 }
182
183 static const struct hid_device_id ax_devices[] = {
184         { HID_USB_DEVICE(USB_VENDOR_ID_ACRUX, 0x0802), },
185         { }
186 };
187 MODULE_DEVICE_TABLE(hid, ax_devices);
188
189 static struct hid_driver ax_driver = {
190         .name           = "acrux",
191         .id_table       = ax_devices,
192         .probe          = ax_probe,
193         .remove         = ax_remove,
194 };
195
196 static int __init ax_init(void)
197 {
198         return hid_register_driver(&ax_driver);
199 }
200
201 static void __exit ax_exit(void)
202 {
203         hid_unregister_driver(&ax_driver);
204 }
205
206 module_init(ax_init);
207 module_exit(ax_exit);
208
209 MODULE_AUTHOR("Sergei Kolzun");
210 MODULE_DESCRIPTION("Force feedback support for ACRUX game controllers");
211 MODULE_LICENSE("GPL");