cregit-Linux how code gets into the kernel

Release 4.7 drivers/hid/hid-axff.c

Directory: drivers/hid
/*
 * Force feedback support for ACRUX game controllers
 *
 * From what I have gathered, these devices are mass produced in China
 * by several vendors. They often share the same design as the original
 * Xbox 360 controller.
 *
 * 1a34:0802 "ACRUX USB GAMEPAD 8116"
 *  - tested with an EXEQ EQ-PCU-02090 game controller.
 *
 * Copyright (c) 2010 Sergei Kolzun <x0r@dv-life.ru>
 */

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

#include "hid-ids.h"

#ifdef CONFIG_HID_ACRUX_FF


struct axff_device {
	
struct hid_report *report;
};


static int axff_play(struct input_dev *dev, void *data, struct ff_effect *effect) { struct hid_device *hid = input_get_drvdata(dev); struct axff_device *axff = data; struct hid_report *report = axff->report; int field_count = 0; int left, right; int i, j; left = effect->u.rumble.strong_magnitude; right = effect->u.rumble.weak_magnitude; dbg_hid("called with 0x%04x 0x%04x", left, right); left = left * 0xff / 0xffff; right = right * 0xff / 0xffff; for (i = 0; i < report->maxfield; i++) { for (j = 0; j < report->field[i]->report_count; j++) { report->field[i]->value[j] = field_count % 2 ? right : left; field_count++; } } dbg_hid("running with 0x%02x 0x%02x", left, right); hid_hw_request(hid, axff->report, HID_REQ_SET_REPORT); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
sergei kolzunsergei kolzun18998.95%266.67%
benjamin tissoiresbenjamin tissoires21.05%133.33%
Total191100.00%3100.00%


static int axff_init(struct hid_device *hid) { struct axff_device *axff; 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 field_count = 0; int i, j; 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); for (i = 0; i < report->maxfield; i++) { for (j = 0; j < report->field[i]->report_count; j++) { report->field[i]->value[j] = 0x00; field_count++; } } if (field_count < 4 && hid->product != 0xf705) { hid_err(hid, "not enough fields in the report: %d\n", field_count); return -ENODEV; } axff = kzalloc(sizeof(struct axff_device), GFP_KERNEL); if (!axff) return -ENOMEM; set_bit(FF_RUMBLE, dev->ffbit); error = input_ff_create_memless(dev, axff, axff_play); if (error) goto err_free_mem; axff->report = report; hid_hw_request(hid, axff->report, HID_REQ_SET_REPORT); hid_info(hid, "Force Feedback for ACRUX game controllers by Sergei Kolzun <x0r@dv-life.ru>\n"); return 0; err_free_mem: kfree(axff); return error; }

Contributors

PersonTokensPropCommitsCommitProp
sergei kolzunsergei kolzun26696.03%240.00%
tristan ricetristan rice62.17%120.00%
joe perchesjoe perches31.08%120.00%
benjamin tissoiresbenjamin tissoires20.72%120.00%
Total277100.00%5100.00%

#else
static inline int axff_init(struct hid_device *hid) { return 0; }

Contributors

PersonTokensPropCommitsCommitProp
dmitry torokhovdmitry torokhov15100.00%1100.00%
Total15100.00%1100.00%

#endif
static int ax_probe(struct hid_device *hdev, const struct hid_device_id *id) { int error; dev_dbg(&hdev->dev, "ACRUX HID hardware probe...\n"); error = hid_parse(hdev); if (error) { hid_err(hdev, "parse failed\n"); return error; } error = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF); if (error) { hid_err(hdev, "hw start failed\n"); return error; } error = axff_init(hdev); if (error) { /* * Do not fail device initialization completely as device * may still be partially operable, just warn. */ hid_warn(hdev, "Failed to enable force feedback support, error: %d\n", error); } /* * We need to start polling device right away, otherwise * it will go into a coma. */ error = hid_hw_open(hdev); if (error) { dev_err(&hdev->dev, "hw open failed\n"); hid_hw_stop(hdev); return error; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
sergei kolzunsergei kolzun10374.10%125.00%
dmitry torokhovdmitry torokhov2719.42%125.00%
axel linaxel lin53.60%125.00%
joe perchesjoe perches42.88%125.00%
Total139100.00%4100.00%


static void ax_remove(struct hid_device *hdev) { hid_hw_close(hdev); hid_hw_stop(hdev); }

Contributors

PersonTokensPropCommitsCommitProp
dmitry torokhovdmitry torokhov21100.00%1100.00%
Total21100.00%1100.00%

static const struct hid_device_id ax_devices[] = { { HID_USB_DEVICE(USB_VENDOR_ID_ACRUX, 0x0802), }, { HID_USB_DEVICE(USB_VENDOR_ID_ACRUX, 0xf705), }, { } }; MODULE_DEVICE_TABLE(hid, ax_devices); static struct hid_driver ax_driver = { .name = "acrux", .id_table = ax_devices, .probe = ax_probe, .remove = ax_remove, }; module_hid_driver(ax_driver); MODULE_AUTHOR("Sergei Kolzun"); MODULE_DESCRIPTION("Force feedback support for ACRUX game controllers"); MODULE_LICENSE("GPL");

Overall Contributors

PersonTokensPropCommitsCommitProp
sergei kolzunsergei kolzun64985.39%222.22%
dmitry torokhovdmitry torokhov759.87%111.11%
tristan ricetristan rice151.97%111.11%
joe perchesjoe perches70.92%111.11%
axel linaxel lin50.66%111.11%
benjamin tissoiresbenjamin tissoires40.53%111.11%
paul gortmakerpaul gortmaker30.39%111.11%
h hartley sweetenh hartley sweeten20.26%111.11%
Total760100.00%9100.00%
Directory: drivers/hid
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