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Release 4.7 drivers/hid/hid-holtekff.c

Directory: drivers/hid
/*
 *  Force feedback support for Holtek On Line Grip based gamepads
 *
 *  These include at least a Brazilian "Clone Joypad Super Power Fire"
 *  which uses vendor ID 0x1241 and identifies as "HOLTEK On Line Grip".
 *
 *  Copyright (c) 2011 Anssi Hannula <anssi.hannula@iki.fi>
 */

/*
 * 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 <linux/slab.h>

#include "hid-ids.h"

#ifdef CONFIG_HOLTEK_FF

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Anssi Hannula <anssi.hannula@iki.fi>");
MODULE_DESCRIPTION("Force feedback support for Holtek On Line Grip based devices");

/*
 * These commands and parameters are currently known:
 *
 * byte 0: command id:
 *      01  set effect parameters
 *      02  play specified effect
 *      03  stop specified effect
 *      04  stop all effects
 *      06  stop all effects
 *      (the difference between 04 and 06 isn't known; win driver
 *       sends 06,04 on application init, and 06 otherwise)
 * 
 * Commands 01 and 02 need to be sent as pairs, i.e. you need to send 01
 * before each 02.
 *
 * The rest of the bytes are parameters. Command 01 takes all of them, and
 * commands 02,03 take only the effect id.
 *
 * byte 1:
 *      bits 0-3: effect id:
 *              1: very strong rumble
 *              2: periodic rumble, short intervals
 *              3: very strong rumble
 *              4: periodic rumble, long intervals
 *              5: weak periodic rumble, long intervals
 *              6: weak periodic rumble, short intervals
 *              7: periodic rumble, short intervals
 *              8: strong periodic rumble, short intervals
 *              9: very strong rumble
 *              a: causes an error
 *              b: very strong periodic rumble, very short intervals
 *              c-f: nothing
 *      bit 6: right (weak) motor enabled
 *      bit 7: left (strong) motor enabled
 *
 * bytes 2-3:  time in milliseconds, big-endian
 * bytes 5-6:  unknown (win driver seems to use at least 10e0 with effect 1
 *                     and 0014 with effect 6)
 * byte 7:
 *      bits 0-3: effect magnitude
 */


#define HOLTEKFF_MSG_LENGTH     7


static const u8 start_effect_1[] = { 0x02, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00 };

static const u8 stop_all4[] =	   { 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };

static const u8 stop_all6[] =	   { 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };


struct holtekff_device {
	
struct hid_field *field;
};


static void holtekff_send(struct holtekff_device *holtekff, struct hid_device *hid, const u8 data[HOLTEKFF_MSG_LENGTH]) { int i; for (i = 0; i < HOLTEKFF_MSG_LENGTH; i++) { holtekff->field->value[i] = data[i]; } dbg_hid("sending %7ph\n", data); hid_hw_request(hid, holtekff->field->report, HID_REQ_SET_REPORT); }

Contributors

PersonTokensPropCommitsCommitProp
anssi hannulaanssi hannula7296.00%133.33%
benjamin tissoiresbenjamin tissoires22.67%133.33%
andy shevchenkoandy shevchenko11.33%133.33%
Total75100.00%3100.00%


static int holtekff_play(struct input_dev *dev, void *data, struct ff_effect *effect) { struct hid_device *hid = input_get_drvdata(dev); struct holtekff_device *holtekff = data; int left, right; /* effect type 1, length 65535 msec */ u8 buf[HOLTEKFF_MSG_LENGTH] = { 0x01, 0x01, 0xff, 0xff, 0x10, 0xe0, 0x00 }; left = effect->u.rumble.strong_magnitude; right = effect->u.rumble.weak_magnitude; dbg_hid("called with 0x%04x 0x%04x\n", left, right); if (!left && !right) { holtekff_send(holtekff, hid, stop_all6); return 0; } if (left) buf[1] |= 0x80; if (right) buf[1] |= 0x40; /* The device takes a single magnitude, so we just sum them up. */ buf[6] = min(0xf, (left >> 12) + (right >> 12)); holtekff_send(holtekff, hid, buf); holtekff_send(holtekff, hid, start_effect_1); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
anssi hannulaanssi hannula182100.00%1100.00%
Total182100.00%1100.00%


static int holtekff_init(struct hid_device *hid) { struct holtekff_device *holtekff; struct hid_report *report; 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; int error; if (list_empty(report_list)) { hid_err(hid, "no output report found\n"); return -ENODEV; } report = list_entry(report_list->next, struct hid_report, list); if (report->maxfield < 1 || report->field[0]->report_count != 7) { hid_err(hid, "unexpected output report layout\n"); return -ENODEV; } holtekff = kzalloc(sizeof(*holtekff), GFP_KERNEL); if (!holtekff) return -ENOMEM; set_bit(FF_RUMBLE, dev->ffbit); holtekff->field = report->field[0]; /* initialize the same way as win driver does */ holtekff_send(holtekff, hid, stop_all4); holtekff_send(holtekff, hid, stop_all6); error = input_ff_create_memless(dev, holtekff, holtekff_play); if (error) { kfree(holtekff); return error; } hid_info(hid, "Force feedback for Holtek On Line Grip based devices by Anssi Hannula <anssi.hannula@iki.fi>\n"); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
anssi hannulaanssi hannula229100.00%1100.00%
Total229100.00%1100.00%

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

Contributors

PersonTokensPropCommitsCommitProp
anssi hannulaanssi hannula15100.00%1100.00%
Total15100.00%1100.00%

#endif
static int holtek_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; } holtekff_init(hdev); return 0; err: return ret; }

Contributors

PersonTokensPropCommitsCommitProp
anssi hannulaanssi hannula84100.00%1100.00%
Total84100.00%1100.00%

static const struct hid_device_id holtek_devices[] = { { HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK, USB_DEVICE_ID_HOLTEK_ON_LINE_GRIP) }, { } }; MODULE_DEVICE_TABLE(hid, holtek_devices); static struct hid_driver holtek_driver = { .name = "holtek", .id_table = holtek_devices, .probe = holtek_probe, }; module_hid_driver(holtek_driver);

Overall Contributors

PersonTokensPropCommitsCommitProp
anssi hannulaanssi hannula75198.95%120.00%
paul gortmakerpaul gortmaker30.40%120.00%
h hartley sweetenh hartley sweeten20.26%120.00%
benjamin tissoiresbenjamin tissoires20.26%120.00%
andy shevchenkoandy shevchenko10.13%120.00%
Total759100.00%5100.00%
Directory: drivers/hid
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