Simon Wood | 32c88cb | 2010-09-22 13:19:42 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Force feedback support for Logitech Speed Force Wireless |
| 3 | * |
| 4 | * http://wiibrew.org/wiki/Logitech_USB_steering_wheel |
| 5 | * |
| 6 | * Copyright (c) 2010 Simon Wood <simon@mungewell.org> |
| 7 | */ |
| 8 | |
| 9 | /* |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this program; if not, write to the Free Software |
| 22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 23 | */ |
| 24 | |
| 25 | |
| 26 | #include <linux/input.h> |
| 27 | #include <linux/usb.h> |
| 28 | #include <linux/hid.h> |
| 29 | |
| 30 | #include "usbhid/usbhid.h" |
| 31 | #include "hid-lg.h" |
| 32 | |
| 33 | struct lg4ff_device { |
| 34 | struct hid_report *report; |
| 35 | }; |
| 36 | |
| 37 | static const signed short ff4_wheel_ac[] = { |
| 38 | FF_CONSTANT, |
| 39 | FF_AUTOCENTER, |
| 40 | -1 |
| 41 | }; |
| 42 | |
| 43 | static int hid_lg4ff_play(struct input_dev *dev, void *data, |
| 44 | struct ff_effect *effect) |
| 45 | { |
| 46 | struct hid_device *hid = input_get_drvdata(dev); |
| 47 | struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; |
| 48 | struct hid_report *report = list_entry(report_list->next, struct hid_report, list); |
| 49 | int x; |
| 50 | |
| 51 | #define CLAMP(x) if (x < 0) x = 0; if (x > 0xff) x = 0xff |
| 52 | |
| 53 | switch (effect->type) { |
| 54 | case FF_CONSTANT: |
| 55 | x = effect->u.ramp.start_level + 0x80; /* 0x80 is no force */ |
| 56 | CLAMP(x); |
| 57 | report->field[0]->value[0] = 0x11; /* Slot 1 */ |
| 58 | report->field[0]->value[1] = 0x10; |
| 59 | report->field[0]->value[2] = x; |
| 60 | report->field[0]->value[3] = 0x00; |
| 61 | report->field[0]->value[4] = 0x00; |
| 62 | report->field[0]->value[5] = 0x08; |
| 63 | report->field[0]->value[6] = 0x00; |
| 64 | dbg_hid("Autocenter, x=0x%02X\n", x); |
| 65 | |
| 66 | usbhid_submit_report(hid, report, USB_DIR_OUT); |
| 67 | break; |
| 68 | } |
| 69 | return 0; |
| 70 | } |
| 71 | |
| 72 | static void hid_lg4ff_set_autocenter(struct input_dev *dev, u16 magnitude) |
| 73 | { |
| 74 | struct hid_device *hid = input_get_drvdata(dev); |
| 75 | struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; |
| 76 | struct hid_report *report = list_entry(report_list->next, struct hid_report, list); |
| 77 | __s32 *value = report->field[0]->value; |
| 78 | |
| 79 | *value++ = 0xfe; |
| 80 | *value++ = 0x0d; |
| 81 | *value++ = 0x07; |
| 82 | *value++ = 0x07; |
| 83 | *value++ = (magnitude >> 8) & 0xff; |
| 84 | *value++ = 0x00; |
| 85 | *value = 0x00; |
| 86 | |
| 87 | usbhid_submit_report(hid, report, USB_DIR_OUT); |
| 88 | } |
| 89 | |
| 90 | |
| 91 | int lg4ff_init(struct hid_device *hid) |
| 92 | { |
| 93 | struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list); |
| 94 | struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; |
| 95 | struct input_dev *dev = hidinput->input; |
| 96 | struct hid_report *report; |
| 97 | struct hid_field *field; |
| 98 | const signed short *ff_bits = ff4_wheel_ac; |
| 99 | int error; |
| 100 | int i; |
| 101 | |
| 102 | /* Find the report to use */ |
| 103 | if (list_empty(report_list)) { |
Joe Perches | 4291ee3 | 2010-12-09 19:29:03 -0800 | [diff] [blame^] | 104 | hid_err(hid, "No output report found\n"); |
Simon Wood | 32c88cb | 2010-09-22 13:19:42 +0200 | [diff] [blame] | 105 | return -1; |
| 106 | } |
| 107 | |
| 108 | /* Check that the report looks ok */ |
| 109 | report = list_entry(report_list->next, struct hid_report, list); |
| 110 | if (!report) { |
Joe Perches | 4291ee3 | 2010-12-09 19:29:03 -0800 | [diff] [blame^] | 111 | hid_err(hid, "NULL output report\n"); |
Simon Wood | 32c88cb | 2010-09-22 13:19:42 +0200 | [diff] [blame] | 112 | return -1; |
| 113 | } |
| 114 | |
| 115 | field = report->field[0]; |
| 116 | if (!field) { |
Joe Perches | 4291ee3 | 2010-12-09 19:29:03 -0800 | [diff] [blame^] | 117 | hid_err(hid, "NULL field\n"); |
Simon Wood | 32c88cb | 2010-09-22 13:19:42 +0200 | [diff] [blame] | 118 | return -1; |
| 119 | } |
| 120 | |
| 121 | for (i = 0; ff_bits[i] >= 0; i++) |
| 122 | set_bit(ff_bits[i], dev->ffbit); |
| 123 | |
| 124 | error = input_ff_create_memless(dev, NULL, hid_lg4ff_play); |
| 125 | |
| 126 | if (error) |
| 127 | return error; |
| 128 | |
| 129 | if (test_bit(FF_AUTOCENTER, dev->ffbit)) |
| 130 | dev->ff->set_autocenter = hid_lg4ff_set_autocenter; |
| 131 | |
Joe Perches | 4291ee3 | 2010-12-09 19:29:03 -0800 | [diff] [blame^] | 132 | hid_info(hid, "Force feedback for Logitech Speed Force Wireless by Simon Wood <simon@mungewell.org>\n"); |
Simon Wood | 32c88cb | 2010-09-22 13:19:42 +0200 | [diff] [blame] | 133 | return 0; |
| 134 | } |
| 135 | |