cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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iforce.h (4185B)

      1/* SPDX-License-Identifier: GPL-2.0-or-later */
      2/*
      3 *  Copyright (c) 2000-2002 Vojtech Pavlik <vojtech@ucw.cz>
      4 *  Copyright (c) 2001-2002, 2007 Johann Deneux <johann.deneux@gmail.com>
      5 *
      6 *  USB/RS232 I-Force joysticks and wheels.
      7 */
      8
      9#include <linux/kernel.h>
     10#include <linux/slab.h>
     11#include <linux/input.h>
     12#include <linux/module.h>
     13#include <linux/spinlock.h>
     14#include <linux/circ_buf.h>
     15#include <linux/mutex.h>
     16
     17/* This module provides arbitrary resource management routines.
     18 * I use it to manage the device's memory.
     19 * Despite the name of this module, I am *not* going to access the ioports.
     20 */
     21#include <linux/ioport.h>
     22
     23
     24#define IFORCE_MAX_LENGTH	16
     25
     26#define IFORCE_EFFECTS_MAX	32
     27
     28/* Each force feedback effect is made of one core effect, which can be
     29 * associated to at most to effect modifiers
     30 */
     31#define FF_MOD1_IS_USED		0
     32#define FF_MOD2_IS_USED		1
     33#define FF_CORE_IS_USED		2
     34#define FF_CORE_IS_PLAYED	3	/* Effect is currently being played */
     35#define FF_CORE_SHOULD_PLAY	4	/* User wants the effect to be played */
     36#define FF_CORE_UPDATE		5	/* Effect is being updated */
     37#define FF_MODCORE_CNT		6
     38
     39struct iforce_core_effect {
     40	/* Information about where modifiers are stored in the device's memory */
     41	struct resource mod1_chunk;
     42	struct resource mod2_chunk;
     43	unsigned long flags[BITS_TO_LONGS(FF_MODCORE_CNT)];
     44};
     45
     46#define FF_CMD_EFFECT		0x010e
     47#define FF_CMD_ENVELOPE		0x0208
     48#define FF_CMD_MAGNITUDE	0x0303
     49#define FF_CMD_PERIOD		0x0407
     50#define FF_CMD_CONDITION	0x050a
     51
     52#define FF_CMD_AUTOCENTER	0x4002
     53#define FF_CMD_PLAY		0x4103
     54#define FF_CMD_ENABLE		0x4201
     55#define FF_CMD_GAIN		0x4301
     56
     57#define FF_CMD_QUERY		0xff01
     58
     59/* Buffer for async write */
     60#define XMIT_SIZE		256
     61#define XMIT_INC(var, n)	(var)+=n; (var)&= XMIT_SIZE -1
     62/* iforce::xmit_flags */
     63#define IFORCE_XMIT_RUNNING	0
     64#define IFORCE_XMIT_AGAIN	1
     65
     66struct iforce_device {
     67	u16 idvendor;
     68	u16 idproduct;
     69	char *name;
     70	signed short *btn;
     71	signed short *abs;
     72	signed short *ff;
     73};
     74
     75struct iforce;
     76
     77struct iforce_xport_ops {
     78	void (*xmit)(struct iforce *iforce);
     79	int (*get_id)(struct iforce *iforce, u8 id,
     80		      u8 *response_data, size_t *response_len);
     81	int (*start_io)(struct iforce *iforce);
     82	void (*stop_io)(struct iforce *iforce);
     83};
     84
     85struct iforce {
     86	struct input_dev *dev;		/* Input device interface */
     87	struct iforce_device *type;
     88	const struct iforce_xport_ops *xport_ops;
     89
     90	spinlock_t xmit_lock;
     91	/* Buffer used for asynchronous sending of bytes to the device */
     92	struct circ_buf xmit;
     93	unsigned char xmit_data[XMIT_SIZE];
     94	unsigned long xmit_flags[1];
     95
     96					/* Force Feedback */
     97	wait_queue_head_t wait;
     98	struct resource device_memory;
     99	struct iforce_core_effect core_effects[IFORCE_EFFECTS_MAX];
    100	struct mutex mem_mutex;
    101};
    102
    103/* Get hi and low bytes of a 16-bits int */
    104#define HI(a)	((unsigned char)((a) >> 8))
    105#define LO(a)	((unsigned char)((a) & 0xff))
    106
    107/* For many parameters, it seems that 0x80 is a special value that should
    108 * be avoided. Instead, we replace this value by 0x7f
    109 */
    110#define HIFIX80(a) ((unsigned char)(((a)<0? (a)+255 : (a))>>8))
    111
    112/* Encode a time value */
    113#define TIME_SCALE(a)	(a)
    114
    115static inline int iforce_get_id_packet(struct iforce *iforce, u8 id,
    116				       u8 *response_data, size_t *response_len)
    117{
    118	return iforce->xport_ops->get_id(iforce, id,
    119					 response_data, response_len);
    120}
    121
    122/* Public functions */
    123/* iforce-main.c */
    124int iforce_init_device(struct device *parent, u16 bustype,
    125		       struct iforce *iforce);
    126
    127/* iforce-packets.c */
    128int iforce_control_playback(struct iforce*, u16 id, unsigned int);
    129void iforce_process_packet(struct iforce *iforce,
    130			   u8 packet_id, u8 *data, size_t len);
    131int iforce_send_packet(struct iforce *iforce, u16 cmd, unsigned char* data);
    132void iforce_dump_packet(struct iforce *iforce, char *msg, u16 cmd, unsigned char *data);
    133
    134/* iforce-ff.c */
    135int iforce_upload_periodic(struct iforce *, struct ff_effect *, struct ff_effect *);
    136int iforce_upload_constant(struct iforce *, struct ff_effect *, struct ff_effect *);
    137int iforce_upload_condition(struct iforce *, struct ff_effect *, struct ff_effect *);
    138
    139/* Public variables */
    140extern struct serio_driver iforce_serio_drv;
    141extern struct usb_driver iforce_usb_driver;