cregit-Linux how code gets into the kernel

Release 4.7 drivers/hid/hid-emsff.c

Directory: drivers/hid
/*
 *  Force feedback support for EMS Trio Linker Plus II
 *
 *  Copyright (c) 2010 Ignaz Forster <ignaz.forster@gmx.de>
 */

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

#include "hid-ids.h"


struct emsff_device {
	
struct hid_report *report;
};


static int emsff_play(struct input_dev *dev, void *data, struct ff_effect *effect) { struct hid_device *hid = input_get_drvdata(dev); struct emsff_device *emsff = data; int weak, strong; weak = effect->u.rumble.weak_magnitude; strong = effect->u.rumble.strong_magnitude; dbg_hid("called with 0x%04x 0x%04x\n", strong, weak); weak = weak * 0xff / 0xffff; strong = strong * 0xff / 0xffff; emsff->report->field[0]->value[1] = weak; emsff->report->field[0]->value[2] = strong; dbg_hid("running with 0x%02x 0x%02x\n", strong, weak); hid_hw_request(hid, emsff->report, HID_REQ_SET_REPORT); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
ignaz forsterignaz forster14098.59%150.00%
benjamin tissoiresbenjamin tissoires21.41%150.00%
Total142100.00%2100.00%


static int emsff_init(struct hid_device *hid) { struct emsff_device *emsff; struct hid_report *report; struct hid_input *hidinput = list_first_entry(&hid->inputs, struct hid_input, list); struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; struct input_dev *dev = hidinput->input; int error; if (list_empty(report_list)) { hid_err(hid, "no output reports found\n"); return -ENODEV; } report = list_first_entry(report_list, struct hid_report, list); if (report->maxfield < 1) { hid_err(hid, "no fields in the report\n"); return -ENODEV; } if (report->field[0]->report_count < 7) { hid_err(hid, "not enough values in the field\n"); return -ENODEV; } emsff = kzalloc(sizeof(struct emsff_device), GFP_KERNEL); if (!emsff) return -ENOMEM; set_bit(FF_RUMBLE, dev->ffbit); error = input_ff_create_memless(dev, emsff, emsff_play); if (error) { kfree(emsff); return error; } emsff->report = report; emsff->report->field[0]->value[0] = 0x01; emsff->report->field[0]->value[1] = 0x00; emsff->report->field[0]->value[2] = 0x00; emsff->report->field[0]->value[3] = 0x00; emsff->report->field[0]->value[4] = 0x00; emsff->report->field[0]->value[5] = 0x00; emsff->report->field[0]->value[6] = 0x00; hid_hw_request(hid, emsff->report, HID_REQ_SET_REPORT); hid_info(hid, "force feedback for EMS based devices by Ignaz Forster <ignaz.forster@gmx.de>\n"); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
ignaz forsterignaz forster33397.94%133.33%
joe perchesjoe perches51.47%133.33%
benjamin tissoiresbenjamin tissoires20.59%133.33%
Total340100.00%3100.00%


static int ems_probe(struct hid_device *hdev, const struct hid_device_id *id) { int ret; ret = hid_parse(hdev); if (ret) { hid_err(hdev, "parse failed\n"); goto err; } ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF); if (ret) { hid_err(hdev, "hw start failed\n"); goto err; } ret = emsff_init(hdev); if (ret) { dev_err(&hdev->dev, "force feedback init failed\n"); hid_hw_stop(hdev); goto err; } return 0; err: return ret; }

Contributors

PersonTokensPropCommitsCommitProp
ignaz forsterignaz forster8274.55%133.33%
axel linaxel lin2623.64%133.33%
joe perchesjoe perches21.82%133.33%
Total110100.00%3100.00%

static const struct hid_device_id ems_devices[] = { { HID_USB_DEVICE(USB_VENDOR_ID_EMS, USB_DEVICE_ID_EMS_TRIO_LINKER_PLUS_II) }, { } }; MODULE_DEVICE_TABLE(hid, ems_devices); static struct hid_driver ems_driver = { .name = "hkems", .id_table = ems_devices, .probe = ems_probe, }; module_hid_driver(ems_driver); MODULE_LICENSE("GPL");

Overall Contributors

PersonTokensPropCommitsCommitProp
ignaz forsterignaz forster63293.63%114.29%
axel linaxel lin263.85%114.29%
joe perchesjoe perches71.04%114.29%
benjamin tissoiresbenjamin tissoires40.59%114.29%
paul gortmakerpaul gortmaker30.44%114.29%
h hartley sweetenh hartley sweeten20.30%114.29%
jiri kosinajiri kosina10.15%114.29%
Total675100.00%7100.00%
Directory: drivers/hid
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