cregit-Linux how code gets into the kernel

Release 4.7 drivers/hid/hid-lgff.c

Directory: drivers/hid
/*
 * Force feedback support for hid-compliant for some of the devices from
 * Logitech, namely:
 * - WingMan Cordless RumblePad
 * - WingMan Force 3D
 *
 *  Copyright (c) 2002-2004 Johann Deneux
 *  Copyright (c) 2006 Anssi Hannula <anssi.hannula@gmail.com>
 */

/*
 * 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
 *
 * Should you need to contact me, the author, you can do so by
 * e-mail - mail your message to <johann.deneux@it.uu.se>
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/input.h>
#include <linux/hid.h>

#include "hid-lg.h"


struct dev_type {
	
u16 idVendor;
	
u16 idProduct;
	
const signed short *ff;
};


static const signed short ff_rumble[] = {
	FF_RUMBLE,
	-1
};


static const signed short ff_joystick[] = {
	FF_CONSTANT,
	-1
};


static const signed short ff_joystick_ac[] = {
	FF_CONSTANT,
	FF_AUTOCENTER,
	-1
};


static const struct dev_type devices[] = {
	{ 0x046d, 0xc211, ff_rumble },
	{ 0x046d, 0xc219, ff_rumble },
	{ 0x046d, 0xc283, ff_joystick },
	{ 0x046d, 0xc286, ff_joystick_ac },
	{ 0x046d, 0xc287, ff_joystick_ac },
	{ 0x046d, 0xc293, ff_joystick },
	{ 0x046d, 0xc295, ff_joystick },
};


static int hid_lgff_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, y; unsigned int left, right; #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 + 0x7f; /* 0x7f is center */ y = effect->u.ramp.end_level + 0x7f; CLAMP(x); CLAMP(y); report->field[0]->value[0] = 0x51; report->field[0]->value[1] = 0x08; report->field[0]->value[2] = x; report->field[0]->value[3] = y; dbg_hid("(x, y)=(%04x, %04x)\n", x, y); hid_hw_request(hid, report, HID_REQ_SET_REPORT); break; case FF_RUMBLE: right = effect->u.rumble.strong_magnitude; left = effect->u.rumble.weak_magnitude; right = right * 0xff / 0xffff; left = left * 0xff / 0xffff; CLAMP(left); CLAMP(right); report->field[0]->value[0] = 0x42; report->field[0]->value[1] = 0x00; report->field[0]->value[2] = left; report->field[0]->value[3] = right; dbg_hid("(left, right)=(%04x, %04x)\n", left, right); hid_hw_request(hid, report, HID_REQ_SET_REPORT); break; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
anssi hannulaanssi hannula18355.79%116.67%
johann deneuxjohann deneux7723.48%116.67%
vojtech pavlikvojtech pavlik5717.38%116.67%
jiri kosinajiri kosina41.22%116.67%
benjamin tissoiresbenjamin tissoires41.22%116.67%
dmitry torokhovdmitry torokhov30.91%116.67%
Total328100.00%6100.00%


static void hid_lgff_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; magnitude = (magnitude >> 12) & 0xf; *value++ = 0xfe; *value++ = 0x0d; *value++ = magnitude; /* clockwise strength */ *value++ = magnitude; /* counter-clockwise strength */ *value++ = 0x80; *value++ = 0x00; *value = 0x00; hid_hw_request(hid, report, HID_REQ_SET_REPORT); }

Contributors

PersonTokensPropCommitsCommitProp
sergey belyashovsergey belyashov12998.47%150.00%
benjamin tissoiresbenjamin tissoires21.53%150.00%
Total131100.00%2100.00%


int lgff_init(struct hid_device* hid) { struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list); struct input_dev *dev = hidinput->input; const signed short *ff_bits = ff_joystick; int error; int i; /* Check that the report looks ok */ if (!hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 7)) return -ENODEV; for (i = 0; i < ARRAY_SIZE(devices); i++) { if (dev->id.vendor == devices[i].idVendor && dev->id.product == devices[i].idProduct) { ff_bits = devices[i].ff; break; } } for (i = 0; ff_bits[i] >= 0; i++) set_bit(ff_bits[i], dev->ffbit); error = input_ff_create_memless(dev, NULL, hid_lgff_play); if (error) return error; if ( test_bit(FF_AUTOCENTER, dev->ffbit) ) dev->ff->set_autocenter = hid_lgff_set_autocenter; pr_info("Force feedback for Logitech force feedback devices by Johann Deneux <johann.deneux@it.uu.se>\n"); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
anssi hannulaanssi hannula9044.12%19.09%
johann deneuxjohann deneux2813.73%218.18%
vojtech pavlikvojtech pavlik2713.24%19.09%
dmitry torokhovdmitry torokhov2612.75%218.18%
sergey belyashovsergey belyashov199.31%19.09%
kees cookkees cook83.92%19.09%
joe perchesjoe perches41.96%19.09%
greg kroah-hartmangreg kroah-hartman10.49%19.09%
jiri slabyjiri slaby10.49%19.09%
Total204100.00%11100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
anssi hannulaanssi hannula27834.45%14.17%
johann deneuxjohann deneux16520.45%28.33%
sergey belyashovsergey belyashov16520.45%28.33%
vojtech pavlikvojtech pavlik9511.77%14.17%
dmitry torokhovdmitry torokhov303.72%312.50%
jiri kosinajiri kosina222.73%520.83%
joe perchesjoe perches111.36%14.17%
gary steingary stein80.99%14.17%
kees cookkees cook80.99%14.17%
svrmgrl at gmx.netsvrmgrl at gmx.net80.99%14.17%
benjamin tissoiresbenjamin tissoires60.74%14.17%
jiri slabyjiri slaby40.50%28.33%
valentin zaguravalentin zagura40.50%14.17%
kay sieverskay sievers20.25%14.17%
greg kroah-hartmangreg kroah-hartman10.12%14.17%
Total807100.00%24100.00%
Directory: drivers/hid
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