drivers/input/joystick/amijoy.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Copyright (c) 1998-2001 Vojtech Pavlik
   4  */
   5
   6 /*
   7  * Driver for Amiga joysticks for Linux/m68k
   8  */
   9
  10 /*
  11  */
  12
  13 #include <linux/types.h>
  14 #include <linux/errno.h>
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/init.h>
  18 #include <linux/input.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/mutex.h>
  21
  22 #include <asm/amigahw.h>
  23 #include <asm/amigaints.h>
  24
  25 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  26 MODULE_DESCRIPTION("Driver for Amiga joysticks");
  27 MODULE_LICENSE("GPL");
  28
  29 static int amijoy[2] = { 0, 1 };
  30 module_param_array_named(map, amijoy, uint, NULL, 0);
  31 MODULE_PARM_DESC(map, "Map of attached joysticks in form of <a>,<b> (default is 0,1)");
  32
  33 static int amijoy_used;
  34 static DEFINE_MUTEX(amijoy_mutex);
  35 static struct input_dev *amijoy_dev[2];
  36 static char *amijoy_phys[2] = { "amijoy/input0", "amijoy/input1" };
  37
  38 static irqreturn_t amijoy_interrupt(int irq, void *dummy)
  39 {
  40         int i, data = 0, button = 0;
  41
  42         for (i = 0; i < 2; i++)
  43                 if (amijoy[i]) {
  44
  45                         switch (i) {
  46                                 case 0: data = ~amiga_custom.joy0dat; button = (~ciaa.pra >> 6) & 1; break;
  47                                 case 1: data = ~amiga_custom.joy1dat; button = (~ciaa.pra >> 7) & 1; break;
  48                         }
  49
  50                         input_report_key(amijoy_dev[i], BTN_TRIGGER, button);
  51
  52                         input_report_abs(amijoy_dev[i], ABS_X, ((data >> 1) & 1) - ((data >> 9) & 1));
  53                         data = ~(data ^ (data << 1));
  54                         input_report_abs(amijoy_dev[i], ABS_Y, ((data >> 1) & 1) - ((data >> 9) & 1));
  55
  56                         input_sync(amijoy_dev[i]);
  57                 }
  58         return IRQ_HANDLED;
  59 }
  60
  61 static int amijoy_open(struct input_dev *dev)
  62 {
  63         int err;
  64
  65         err = mutex_lock_interruptible(&amijoy_mutex);
  66         if (err)
  67                 return err;
  68
  69         if (!amijoy_used && request_irq(IRQ_AMIGA_VERTB, amijoy_interrupt, 0, "amijoy", amijoy_interrupt)) {
  70                 printk(KERN_ERR "amijoy.c: Can't allocate irq %d\n", IRQ_AMIGA_VERTB);
  71                 err = -EBUSY;
  72                 goto out;
  73         }
  74
  75         amijoy_used++;
  76 out:
  77         mutex_unlock(&amijoy_mutex);
  78         return err;
  79 }
  80
  81 static void amijoy_close(struct input_dev *dev)
  82 {
  83         mutex_lock(&amijoy_mutex);
  84         if (!--amijoy_used)
  85                 free_irq(IRQ_AMIGA_VERTB, amijoy_interrupt);
  86         mutex_unlock(&amijoy_mutex);
  87 }
  88
  89 static int __init amijoy_init(void)
  90 {
  91         int i, j;
  92         int err;
  93
  94         if (!MACH_IS_AMIGA)
  95                 return -ENODEV;
  96
  97         for (i = 0; i < 2; i++) {
  98                 if (!amijoy[i])
  99                         continue;
 100
 101                 amijoy_dev[i] = input_allocate_device();
 102                 if (!amijoy_dev[i]) {
 103                         err = -ENOMEM;
 104                         goto fail;
 105                 }
 106
 107                 if (!request_mem_region(CUSTOM_PHYSADDR + 10 + i * 2, 2, "amijoy [Denise]")) {
 108                         input_free_device(amijoy_dev[i]);
 109                         err = -EBUSY;
 110                         goto fail;
 111                 }
 112
 113                 amijoy_dev[i]->name = "Amiga joystick";
 114                 amijoy_dev[i]->phys = amijoy_phys[i];
 115                 amijoy_dev[i]->id.bustype = BUS_AMIGA;
 116                 amijoy_dev[i]->id.vendor = 0x0001;
 117                 amijoy_dev[i]->id.product = 0x0003;
 118                 amijoy_dev[i]->id.version = 0x0100;
 119
 120                 amijoy_dev[i]->open = amijoy_open;
 121                 amijoy_dev[i]->close = amijoy_close;
 122
 123                 amijoy_dev[i]->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 124                 amijoy_dev[i]->absbit[0] = BIT_MASK(ABS_X) | BIT_MASK(ABS_Y);
 125                 amijoy_dev[i]->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
 126                         BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
 127                 for (j = 0; j < 2; j++) {
 128                         input_set_abs_params(amijoy_dev[i], ABS_X + j,
 129                                              -1, 1, 0, 0);
 130                 }
 131
 132                 err = input_register_device(amijoy_dev[i]);
 133                 if (err) {
 134                         input_free_device(amijoy_dev[i]);
 135                         goto fail;
 136                 }
 137         }
 138         return 0;
 139
 140  fail:  while (--i >= 0)
 141                 if (amijoy[i]) {
 142                         input_unregister_device(amijoy_dev[i]);
 143                         release_mem_region(CUSTOM_PHYSADDR + 10 + i * 2, 2);
 144                 }
 145         return err;
 146 }
 147
 148 static void __exit amijoy_exit(void)
 149 {
 150         int i;
 151
 152         for (i = 0; i < 2; i++)
 153                 if (amijoy[i]) {
 154                         input_unregister_device(amijoy_dev[i]);
 155                         release_mem_region(CUSTOM_PHYSADDR + 10 + i * 2, 2);
 156                 }
 157 }
 158
 159 module_init(amijoy_init);
 160 module_exit(amijoy_exit);