diff options
Diffstat (limited to 'drivers/hid/hid-lg4ff.c')
| -rw-r--r-- | drivers/hid/hid-lg4ff.c | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/drivers/hid/hid-lg4ff.c b/drivers/hid/hid-lg4ff.c new file mode 100644 index 0000000..7eef5a2 --- /dev/null +++ b/drivers/hid/hid-lg4ff.c @@ -0,0 +1,136 @@ +/* + * Force feedback support for Logitech Speed Force Wireless + * + * http://wiibrew.org/wiki/Logitech_USB_steering_wheel + * + * Copyright (c) 2010 Simon Wood <simon@mungewell.org> + */ + +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + + +#include <linux/input.h> +#include <linux/usb.h> +#include <linux/hid.h> + +#include "usbhid/usbhid.h" +#include "hid-lg.h" + +struct lg4ff_device { + struct hid_report *report; +}; + +static const signed short ff4_wheel_ac[] = { + FF_CONSTANT, + FF_AUTOCENTER, + -1 +}; + +static int hid_lg4ff_play(struct input_dev *dev, void *data, + struct ff_effect *effect) +{ + struct hid_device *hid = input_get_drvdata(dev); + struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; + struct hid_report *report = list_entry(report_list->next, struct hid_report, list); + int x; + +#define CLAMP(x) if (x < 0) x = 0; if (x > 0xff) x = 0xff + + switch (effect->type) { + case FF_CONSTANT: + x = effect->u.ramp.start_level + 0x80; /* 0x80 is no force */ + CLAMP(x); + report->field[0]->value[0] = 0x11; /* Slot 1 */ + report->field[0]->value[1] = 0x10; + report->field[0]->value[2] = x; + report->field[0]->value[3] = 0x00; + report->field[0]->value[4] = 0x00; + report->field[0]->value[5] = 0x08; + report->field[0]->value[6] = 0x00; + dbg_hid("Autocenter, x=0x%02X\n", x); + + usbhid_submit_report(hid, report, USB_DIR_OUT); + break; + } + return 0; +} + +static void hid_lg4ff_set_autocenter(struct input_dev *dev, u16 magnitude) +{ + struct hid_device *hid = input_get_drvdata(dev); + struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; + struct hid_report *report = list_entry(report_list->next, struct hid_report, list); + __s32 *value = report->field[0]->value; + + *value++ = 0xfe; + *value++ = 0x0d; + *value++ = 0x07; + *value++ = 0x07; + *value++ = (magnitude >> 8) & 0xff; + *value++ = 0x00; + *value = 0x00; + + usbhid_submit_report(hid, report, USB_DIR_OUT); +} + + +int lg4ff_init(struct hid_device *hid) +{ + struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list); + struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; + struct input_dev *dev = hidinput->input; + struct hid_report *report; + struct hid_field *field; + const signed short *ff_bits = ff4_wheel_ac; + int error; + int i; + + /* Find the report to use */ + if (list_empty(report_list)) { + err_hid("No output report found"); + return -1; + } + + /* Check that the report looks ok */ + report = list_entry(report_list->next, struct hid_report, list); + if (!report) { + err_hid("NULL output report"); + return -1; + } + + field = report->field[0]; + if (!field) { + err_hid("NULL field"); + return -1; + } + + for (i = 0; ff_bits[i] >= 0; i++) + set_bit(ff_bits[i], dev->ffbit); + + error = input_ff_create_memless(dev, NULL, hid_lg4ff_play); + + if (error) + return error; + + if (test_bit(FF_AUTOCENTER, dev->ffbit)) + dev->ff->set_autocenter = hid_lg4ff_set_autocenter; + + dev_info(&hid->dev, "Force feedback for Logitech Speed Force Wireless by " + "Simon Wood <simon@mungewell.org>\n"); + return 0; +} + |