HID: hiddev: fix race between hiddev_disconnect and hiddev_release
[pandora-kernel.git] / drivers / hid / hid-lgff.c
1 /*
2  * Force feedback support for hid-compliant for some of the devices from
3  * Logitech, namely:
4  * - WingMan Cordless RumblePad
5  * - WingMan Force 3D
6  *
7  *  Copyright (c) 2002-2004 Johann Deneux
8  *  Copyright (c) 2006 Anssi Hannula <anssi.hannula@gmail.com>
9  */
10
11 /*
12  * This program is free software; you can redistribute it and/or modify
13  * it under the terms of the GNU General Public License as published by
14  * the Free Software Foundation; either version 2 of the License, or
15  * (at your option) any later version.
16  *
17  * This program is distributed in the hope that it will be useful,
18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
20  * GNU General Public License for more details.
21  *
22  * You should have received a copy of the GNU General Public License
23  * along with this program; if not, write to the Free Software
24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25  *
26  * Should you need to contact me, the author, you can do so by
27  * e-mail - mail your message to <johann.deneux@it.uu.se>
28  */
29
30 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
31
32 #include <linux/input.h>
33 #include <linux/usb.h>
34 #include <linux/hid.h>
35
36 #include "usbhid/usbhid.h"
37 #include "hid-lg.h"
38
39 struct dev_type {
40         u16 idVendor;
41         u16 idProduct;
42         const signed short *ff;
43 };
44
45 static const signed short ff_rumble[] = {
46         FF_RUMBLE,
47         -1
48 };
49
50 static const signed short ff_joystick[] = {
51         FF_CONSTANT,
52         -1
53 };
54
55 static const signed short ff_joystick_ac[] = {
56         FF_CONSTANT,
57         FF_AUTOCENTER,
58         -1
59 };
60
61 static const signed short ff_wheel[] = {
62         FF_CONSTANT,
63         FF_AUTOCENTER,
64         -1
65 };
66
67 static const struct dev_type devices[] = {
68         { 0x046d, 0xc211, ff_rumble },
69         { 0x046d, 0xc219, ff_rumble },
70         { 0x046d, 0xc283, ff_joystick },
71         { 0x046d, 0xc286, ff_joystick_ac },
72         { 0x046d, 0xc287, ff_joystick_ac },
73         { 0x046d, 0xc293, ff_joystick },
74         { 0x046d, 0xc294, ff_wheel },
75         { 0x046d, 0xc295, ff_joystick },
76         { 0x046d, 0xc298, ff_wheel },
77         { 0x046d, 0xc299, ff_wheel },
78         { 0x046d, 0xca03, ff_wheel },
79 };
80
81 static int hid_lgff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
82 {
83         struct hid_device *hid = input_get_drvdata(dev);
84         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
85         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
86         int x, y;
87         unsigned int left, right;
88
89 #define CLAMP(x) if (x < 0) x = 0; if (x > 0xff) x = 0xff
90
91         switch (effect->type) {
92         case FF_CONSTANT:
93                 x = effect->u.ramp.start_level + 0x7f;  /* 0x7f is center */
94                 y = effect->u.ramp.end_level + 0x7f;
95                 CLAMP(x);
96                 CLAMP(y);
97                 report->field[0]->value[0] = 0x51;
98                 report->field[0]->value[1] = 0x08;
99                 report->field[0]->value[2] = x;
100                 report->field[0]->value[3] = y;
101                 dbg_hid("(x, y)=(%04x, %04x)\n", x, y);
102                 usbhid_submit_report(hid, report, USB_DIR_OUT);
103                 break;
104
105         case FF_RUMBLE:
106                 right = effect->u.rumble.strong_magnitude;
107                 left = effect->u.rumble.weak_magnitude;
108                 right = right * 0xff / 0xffff;
109                 left = left * 0xff / 0xffff;
110                 CLAMP(left);
111                 CLAMP(right);
112                 report->field[0]->value[0] = 0x42;
113                 report->field[0]->value[1] = 0x00;
114                 report->field[0]->value[2] = left;
115                 report->field[0]->value[3] = right;
116                 dbg_hid("(left, right)=(%04x, %04x)\n", left, right);
117                 usbhid_submit_report(hid, report, USB_DIR_OUT);
118                 break;
119         }
120         return 0;
121 }
122
123 static void hid_lgff_set_autocenter(struct input_dev *dev, u16 magnitude)
124 {
125         struct hid_device *hid = input_get_drvdata(dev);
126         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
127         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
128         __s32 *value = report->field[0]->value;
129         magnitude = (magnitude >> 12) & 0xf;
130         *value++ = 0xfe;
131         *value++ = 0x0d;
132         *value++ = magnitude;   /* clockwise strength */
133         *value++ = magnitude;   /* counter-clockwise strength */
134         *value++ = 0x80;
135         *value++ = 0x00;
136         *value = 0x00;
137         usbhid_submit_report(hid, report, USB_DIR_OUT);
138 }
139
140 int lgff_init(struct hid_device* hid)
141 {
142         struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
143         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
144         struct input_dev *dev = hidinput->input;
145         struct hid_report *report;
146         struct hid_field *field;
147         const signed short *ff_bits = ff_joystick;
148         int error;
149         int i;
150
151         /* Find the report to use */
152         if (list_empty(report_list)) {
153                 hid_err(hid, "No output report found\n");
154                 return -1;
155         }
156
157         /* Check that the report looks ok */
158         report = list_entry(report_list->next, struct hid_report, list);
159         field = report->field[0];
160         if (!field) {
161                 hid_err(hid, "NULL field\n");
162                 return -1;
163         }
164
165         for (i = 0; i < ARRAY_SIZE(devices); i++) {
166                 if (dev->id.vendor == devices[i].idVendor &&
167                     dev->id.product == devices[i].idProduct) {
168                         ff_bits = devices[i].ff;
169                         break;
170                 }
171         }
172
173         for (i = 0; ff_bits[i] >= 0; i++)
174                 set_bit(ff_bits[i], dev->ffbit);
175
176         error = input_ff_create_memless(dev, NULL, hid_lgff_play);
177         if (error)
178                 return error;
179
180         if ( test_bit(FF_AUTOCENTER, dev->ffbit) )
181                 dev->ff->set_autocenter = hid_lgff_set_autocenter;
182
183         pr_info("Force feedback for Logitech force feedback devices by Johann Deneux <johann.deneux@it.uu.se>\n");
184
185         return 0;
186 }