linux-imx

/*

 *  Force feedback support for memoryless devices

 *

 *  Copyright (c) 2006 Anssi Hannula <anssi.hannula@gmail.com>

 *  Copyright (c) 2006 Dmitry Torokhov <dtor@mail.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

 */

​

/* #define DEBUG */

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/slab.h>

#include <linux/input.h>

#include <linux/module.h>

#include <linux/mutex.h>

#include <linux/spinlock.h>

#include <linux/jiffies.h>

#include <linux/fixp-arith.h>

​

MODULE_LICENSE("GPL");

MODULE_AUTHOR("Anssi Hannula <anssi.hannula@gmail.com>");

MODULE_DESCRIPTION("Force feedback support for memoryless devices");

​

/* Number of effects handled with memoryless devices */

#define FF_MEMLESS_EFFECTS  16

​

/* Envelope update interval in ms */

#define FF_ENVELOPE_INTERVAL    50

​

#define FF_EFFECT_STARTED   0

#define FF_EFFECT_PLAYING   1

#define FF_EFFECT_ABORTING  2

​

struct ml_effect_state {

    struct ff_effect *effect;

    unsigned long flags;    /* effect state (STARTED, PLAYING, etc) */

    int count;      /* loop count of the effect */

    unsigned long play_at;  /* start time */

    unsigned long stop_at;  /* stop time */

    unsigned long adj_at;   /* last time the effect was sent */

};

​

struct ml_device {

    void *private;

    struct ml_effect_state states[FF_MEMLESS_EFFECTS];

    int gain;

    struct timer_list timer;