drivers/input/joystick/iforce/iforce.h

   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
  39 struct 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
  66 struct 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
  75 struct iforce;
  76
  77 struct 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
  85 struct 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
 115 static 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 */
 124 int iforce_init_device(struct device *parent, u16 bustype,
 125                        struct iforce *iforce);
 126
 127 /* iforce-packets.c */
 128 int iforce_control_playback(struct iforce*, u16 id, unsigned int);
 129 void iforce_process_packet(struct iforce *iforce,
 130                            u8 packet_id, u8 *data, size_t len);
 131 int iforce_send_packet(struct iforce *iforce, u16 cmd, unsigned char* data);
 132 void iforce_dump_packet(struct iforce *iforce, char *msg, u16 cmd, unsigned char *data);
 133
 134 /* iforce-ff.c */
 135 int iforce_upload_periodic(struct iforce *, struct ff_effect *, struct ff_effect *);
 136 int iforce_upload_constant(struct iforce *, struct ff_effect *, struct ff_effect *);
 137 int iforce_upload_condition(struct iforce *, struct ff_effect *, struct ff_effect *);
 138
 139 /* Public variables */
 140 extern struct serio_driver iforce_serio_drv;
 141 extern struct usb_driver iforce_usb_driver;