drivers/input/joystick/warrior.c

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This source file includes following definitions.
warrior_process_packet
warrior_interrupt
warrior_disconnect
warrior_connect
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Copyright (c) 1999-2001 Vojtech Pavlik
   4  */
   5 
   6 /*
   7  * Logitech WingMan Warrior joystick driver for Linux
   8  */
   9 
  10 /*
  11  */
  12 
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/slab.h>
  16 #include <linux/input.h>
  17 #include <linux/serio.h>
  18 
  19 #define DRIVER_DESC     "Logitech WingMan Warrior joystick driver"
  20 
  21 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  22 MODULE_DESCRIPTION(DRIVER_DESC);
  23 MODULE_LICENSE("GPL");
  24 
  25 /*
  26  * Constants.
  27  */
  28 
  29 #define WARRIOR_MAX_LENGTH      16
  30 static char warrior_lengths[] = { 0, 4, 12, 3, 4, 4, 0, 0 };
  31 
  32 /*
  33  * Per-Warrior data.
  34  */
  35 
  36 struct warrior {
  37         struct input_dev *dev;
  38         int idx, len;
  39         unsigned char data[WARRIOR_MAX_LENGTH];
  40         char phys[32];
  41 };
  42 
  43 /*
  44  * warrior_process_packet() decodes packets the driver receives from the
  45  * Warrior. It updates the data accordingly.
  46  */
  47 
  48 static void warrior_process_packet(struct warrior *warrior)
  49 {
  50         struct input_dev *dev = warrior->dev;
  51         unsigned char *data = warrior->data;
  52 
  53         if (!warrior->idx) return;
  54 
  55         switch ((data[0] >> 4) & 7) {
  56                 case 1:                                 /* Button data */
  57                         input_report_key(dev, BTN_TRIGGER,  data[3]       & 1);
  58                         input_report_key(dev, BTN_THUMB,   (data[3] >> 1) & 1);
  59                         input_report_key(dev, BTN_TOP,     (data[3] >> 2) & 1);
  60                         input_report_key(dev, BTN_TOP2,    (data[3] >> 3) & 1);
  61                         break;
  62                 case 3:                                 /* XY-axis info->data */
  63                         input_report_abs(dev, ABS_X, ((data[0] & 8) << 5) - (data[2] | ((data[0] & 4) << 5)));
  64                         input_report_abs(dev, ABS_Y, (data[1] | ((data[0] & 1) << 7)) - ((data[0] & 2) << 7));
  65                         break;
  66                 case 5:                                 /* Throttle, spinner, hat info->data */
  67                         input_report_abs(dev, ABS_THROTTLE, (data[1] | ((data[0] & 1) << 7)) - ((data[0] & 2) << 7));
  68                         input_report_abs(dev, ABS_HAT0X, (data[3] & 2 ? 1 : 0) - (data[3] & 1 ? 1 : 0));
  69                         input_report_abs(dev, ABS_HAT0Y, (data[3] & 8 ? 1 : 0) - (data[3] & 4 ? 1 : 0));
  70                         input_report_rel(dev, REL_DIAL,  (data[2] | ((data[0] & 4) << 5)) - ((data[0] & 8) << 5));
  71                         break;
  72         }
  73         input_sync(dev);
  74 }
  75 
  76 /*
  77  * warrior_interrupt() is called by the low level driver when characters
  78  * are ready for us. We then buffer them for further processing, or call the
  79  * packet processing routine.
  80  */
  81 
  82 static irqreturn_t warrior_interrupt(struct serio *serio,
  83                 unsigned char data, unsigned int flags)
  84 {
  85         struct warrior *warrior = serio_get_drvdata(serio);
  86 
  87         if (data & 0x80) {
  88                 if (warrior->idx) warrior_process_packet(warrior);
  89                 warrior->idx = 0;
  90                 warrior->len = warrior_lengths[(data >> 4) & 7];
  91         }
  92 
  93         if (warrior->idx < warrior->len)
  94                 warrior->data[warrior->idx++] = data;
  95 
  96         if (warrior->idx == warrior->len) {
  97                 if (warrior->idx) warrior_process_packet(warrior);
  98                 warrior->idx = 0;
  99                 warrior->len = 0;
 100         }
 101         return IRQ_HANDLED;
 102 }
 103 
 104 /*
 105  * warrior_disconnect() is the opposite of warrior_connect()
 106  */
 107 
 108 static void warrior_disconnect(struct serio *serio)
 109 {
 110         struct warrior *warrior = serio_get_drvdata(serio);
 111 
 112         serio_close(serio);
 113         serio_set_drvdata(serio, NULL);
 114         input_unregister_device(warrior->dev);
 115         kfree(warrior);
 116 }
 117 
 118 /*
 119  * warrior_connect() is the routine that is called when someone adds a
 120  * new serio device. It looks for the Warrior, and if found, registers
 121  * it as an input device.
 122  */
 123 
 124 static int warrior_connect(struct serio *serio, struct serio_driver *drv)
 125 {
 126         struct warrior *warrior;
 127         struct input_dev *input_dev;
 128         int err = -ENOMEM;
 129 
 130         warrior = kzalloc(sizeof(struct warrior), GFP_KERNEL);
 131         input_dev = input_allocate_device();
 132         if (!warrior || !input_dev)
 133                 goto fail1;
 134 
 135         warrior->dev = input_dev;
 136         snprintf(warrior->phys, sizeof(warrior->phys), "%s/input0", serio->phys);
 137 
 138         input_dev->name = "Logitech WingMan Warrior";
 139         input_dev->phys = warrior->phys;
 140         input_dev->id.bustype = BUS_RS232;
 141         input_dev->id.vendor = SERIO_WARRIOR;
 142         input_dev->id.product = 0x0001;
 143         input_dev->id.version = 0x0100;
 144         input_dev->dev.parent = &serio->dev;
 145 
 146         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) |
 147                 BIT_MASK(EV_ABS);
 148         input_dev->keybit[BIT_WORD(BTN_TRIGGER)] = BIT_MASK(BTN_TRIGGER) |
 149                 BIT_MASK(BTN_THUMB) | BIT_MASK(BTN_TOP) | BIT_MASK(BTN_TOP2);
 150         input_dev->relbit[0] = BIT_MASK(REL_DIAL);
 151         input_set_abs_params(input_dev, ABS_X, -64, 64, 0, 8);
 152         input_set_abs_params(input_dev, ABS_Y, -64, 64, 0, 8);
 153         input_set_abs_params(input_dev, ABS_THROTTLE, -112, 112, 0, 0);
 154         input_set_abs_params(input_dev, ABS_HAT0X, -1, 1, 0, 0);
 155         input_set_abs_params(input_dev, ABS_HAT0Y, -1, 1, 0, 0);
 156 
 157         serio_set_drvdata(serio, warrior);
 158 
 159         err = serio_open(serio, drv);
 160         if (err)
 161                 goto fail2;
 162 
 163         err = input_register_device(warrior->dev);
 164         if (err)
 165                 goto fail3;
 166 
 167         return 0;
 168 
 169  fail3: serio_close(serio);
 170  fail2: serio_set_drvdata(serio, NULL);
 171  fail1: input_free_device(input_dev);
 172         kfree(warrior);
 173         return err;
 174 }
 175 
 176 /*
 177  * The serio driver structure.
 178  */
 179 
 180 static const struct serio_device_id warrior_serio_ids[] = {
 181         {
 182                 .type   = SERIO_RS232,
 183                 .proto  = SERIO_WARRIOR,
 184                 .id     = SERIO_ANY,
 185                 .extra  = SERIO_ANY,
 186         },
 187         { 0 }
 188 };
 189 
 190 MODULE_DEVICE_TABLE(serio, warrior_serio_ids);
 191 
 192 static struct serio_driver warrior_drv = {
 193         .driver         = {
 194                 .name   = "warrior",
 195         },
 196         .description    = DRIVER_DESC,
 197         .id_table       = warrior_serio_ids,
 198         .interrupt      = warrior_interrupt,
 199         .connect        = warrior_connect,
 200         .disconnect     = warrior_disconnect,
 201 };
 202 
 203 module_serio_driver(warrior_drv);
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root/drivers/input/joystick/warrior.c

DEFINITIONS
