Merge branch 'hid-battery' of git://git.kernel.org/pub/scm/linux/kernel/git/jeremy...
[linux-2.6.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 struct dev_type devices[] = {
62         { 0x046d, 0xc211, ff_rumble },
63         { 0x046d, 0xc219, ff_rumble },
64         { 0x046d, 0xc283, ff_joystick },
65         { 0x046d, 0xc286, ff_joystick_ac },
66         { 0x046d, 0xc287, ff_joystick_ac },
67         { 0x046d, 0xc293, ff_joystick },
68         { 0x046d, 0xc295, ff_joystick },
69 };
70
71 static int hid_lgff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
72 {
73         struct hid_device *hid = input_get_drvdata(dev);
74         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
75         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
76         int x, y;
77         unsigned int left, right;
78
79 #define CLAMP(x) if (x < 0) x = 0; if (x > 0xff) x = 0xff
80
81         switch (effect->type) {
82         case FF_CONSTANT:
83                 x = effect->u.ramp.start_level + 0x7f;  /* 0x7f is center */
84                 y = effect->u.ramp.end_level + 0x7f;
85                 CLAMP(x);
86                 CLAMP(y);
87                 report->field[0]->value[0] = 0x51;
88                 report->field[0]->value[1] = 0x08;
89                 report->field[0]->value[2] = x;
90                 report->field[0]->value[3] = y;
91                 dbg_hid("(x, y)=(%04x, %04x)\n", x, y);
92                 usbhid_submit_report(hid, report, USB_DIR_OUT);
93                 break;
94
95         case FF_RUMBLE:
96                 right = effect->u.rumble.strong_magnitude;
97                 left = effect->u.rumble.weak_magnitude;
98                 right = right * 0xff / 0xffff;
99                 left = left * 0xff / 0xffff;
100                 CLAMP(left);
101                 CLAMP(right);
102                 report->field[0]->value[0] = 0x42;
103                 report->field[0]->value[1] = 0x00;
104                 report->field[0]->value[2] = left;
105                 report->field[0]->value[3] = right;
106                 dbg_hid("(left, right)=(%04x, %04x)\n", left, right);
107                 usbhid_submit_report(hid, report, USB_DIR_OUT);
108                 break;
109         }
110         return 0;
111 }
112
113 static void hid_lgff_set_autocenter(struct input_dev *dev, u16 magnitude)
114 {
115         struct hid_device *hid = input_get_drvdata(dev);
116         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
117         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
118         __s32 *value = report->field[0]->value;
119         magnitude = (magnitude >> 12) & 0xf;
120         *value++ = 0xfe;
121         *value++ = 0x0d;
122         *value++ = magnitude;   /* clockwise strength */
123         *value++ = magnitude;   /* counter-clockwise strength */
124         *value++ = 0x80;
125         *value++ = 0x00;
126         *value = 0x00;
127         usbhid_submit_report(hid, report, USB_DIR_OUT);
128 }
129
130 int lgff_init(struct hid_device* hid)
131 {
132         struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
133         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
134         struct input_dev *dev = hidinput->input;
135         struct hid_report *report;
136         struct hid_field *field;
137         const signed short *ff_bits = ff_joystick;
138         int error;
139         int i;
140
141         /* Find the report to use */
142         if (list_empty(report_list)) {
143                 hid_err(hid, "No output report found\n");
144                 return -1;
145         }
146
147         /* Check that the report looks ok */
148         report = list_entry(report_list->next, struct hid_report, list);
149         field = report->field[0];
150         if (!field) {
151                 hid_err(hid, "NULL field\n");
152                 return -1;
153         }
154
155         for (i = 0; i < ARRAY_SIZE(devices); i++) {
156                 if (dev->id.vendor == devices[i].idVendor &&
157                     dev->id.product == devices[i].idProduct) {
158                         ff_bits = devices[i].ff;
159                         break;
160                 }
161         }
162
163         for (i = 0; ff_bits[i] >= 0; i++)
164                 set_bit(ff_bits[i], dev->ffbit);
165
166         error = input_ff_create_memless(dev, NULL, hid_lgff_play);
167         if (error)
168                 return error;
169
170         if ( test_bit(FF_AUTOCENTER, dev->ffbit) )
171                 dev->ff->set_autocenter = hid_lgff_set_autocenter;
172
173         pr_info("Force feedback for Logitech force feedback devices by Johann Deneux <johann.deneux@it.uu.se>\n");
174
175         return 0;
176 }