hw/syborg_pointer.c - qemu - Git at Google

 /*
  * Syborg pointing device (mouse/touchscreen)
  *
  * Copyright (c) 2008 CodeSourcery
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */

 #include "sysbus.h"
 #include "console.h"
 #include "syborg.h"

 enum {
     POINTER_ID          = 0,
     POINTER_LATCH       = 1,
     POINTER_FIFO_COUNT  = 2,
     POINTER_X           = 3,
     POINTER_Y           = 4,
     POINTER_Z           = 5,
     POINTER_BUTTONS     = 6,
     POINTER_INT_ENABLE  = 7,
     POINTER_FIFO_SIZE   = 8
 };

 typedef struct {
     int x, y, z, pointer_buttons;
 } event_data;

 typedef struct {
     SysBusDevice busdev;
     int int_enabled;
     int fifo_size;
     event_data *event_fifo;
     int read_pos, read_count;
     qemu_irq irq;
     int absolute;
 } SyborgPointerState;

 static void syborg_pointer_update(SyborgPointerState *s)
 {
     qemu_set_irq(s->irq, s->read_count && s->int_enabled);
 }

 static uint32_t syborg_pointer_read(void *opaque, target_phys_addr_t offset)
 {
     SyborgPointerState *s = (SyborgPointerState *)opaque;

     offset &= 0xfff;
     switch (offset >> 2) {
     case POINTER_ID:
         return s->absolute ? SYBORG_ID_TOUCHSCREEN : SYBORG_ID_MOUSE;
     case POINTER_FIFO_COUNT:
         return s->read_count;
     case POINTER_X:
         return s->event_fifo[s->read_pos].x;
     case POINTER_Y:
         return s->event_fifo[s->read_pos].y;
     case POINTER_Z:
         return s->event_fifo[s->read_pos].z;
     case POINTER_BUTTONS:
         return s->event_fifo[s->read_pos].pointer_buttons;
     case POINTER_INT_ENABLE:
         return s->int_enabled;
     case POINTER_FIFO_SIZE:
         return s->fifo_size;
     default:
         cpu_abort(cpu_single_env, "syborg_pointer_read: Bad offset %x\n",
                   (int)offset);
         return 0;
     }
 }

 static void syborg_pointer_write(void *opaque, target_phys_addr_t offset,
                                  uint32_t value)
 {
     SyborgPointerState *s = (SyborgPointerState *)opaque;

     offset &= 0xfff;
     switch (offset >> 2) {
     case POINTER_LATCH:
         if (s->read_count > 0) {
             s->read_count--;
             if (++s->read_pos == s->fifo_size)
                 s->read_pos = 0;
         }
         break;
     case POINTER_INT_ENABLE:
         s->int_enabled = value;
         break;
     default:
         cpu_abort(cpu_single_env, "syborg_pointer_write: Bad offset %x\n",
                   (int)offset);
     }
     syborg_pointer_update(s);
 }

 static CPUReadMemoryFunc *syborg_pointer_readfn[] = {
    syborg_pointer_read,
    syborg_pointer_read,
    syborg_pointer_read
 };

 static CPUWriteMemoryFunc *syborg_pointer_writefn[] = {
    syborg_pointer_write,
    syborg_pointer_write,
    syborg_pointer_write
 };

 static void syborg_pointer_event(void *opaque, int dx, int dy, int dz,
                                  int buttons_state)
 {
     SyborgPointerState *s = (SyborgPointerState *)opaque;
     int slot = s->read_pos + s->read_count;

     /* This first FIFO entry is used to store current register state.  */
     if (s->read_count < s->fifo_size - 1) {
         s->read_count++;
         slot++;
     }

     if (slot >= s->fifo_size)
           slot -= s->fifo_size;

     if (s->read_count == s->fifo_size && !s->absolute) {
         /* Merge existing entries.  */
         s->event_fifo[slot].x += dx;
         s->event_fifo[slot].y += dy;
         s->event_fifo[slot].z += dz;
     } else {
         s->event_fifo[slot].x = dx;
         s->event_fifo[slot].y = dy;
         s->event_fifo[slot].z = dz;
     }
     s->event_fifo[slot].pointer_buttons = buttons_state;

     syborg_pointer_update(s);
 }

 static void syborg_pointer_save(QEMUFile *f, void *opaque)
 {
     SyborgPointerState *s = (SyborgPointerState *)opaque;
     int i;

     qemu_put_be32(f, s->fifo_size);
     qemu_put_be32(f, s->absolute);
     qemu_put_be32(f, s->int_enabled);
     qemu_put_be32(f, s->read_pos);
     qemu_put_be32(f, s->read_count);
     for (i = 0; i < s->fifo_size; i++) {
         qemu_put_be32(f, s->event_fifo[i].x);
         qemu_put_be32(f, s->event_fifo[i].y);
         qemu_put_be32(f, s->event_fifo[i].z);
         qemu_put_be32(f, s->event_fifo[i].pointer_buttons);
     }
 }

 static int syborg_pointer_load(QEMUFile *f, void *opaque, int version_id)
 {
     SyborgPointerState *s = (SyborgPointerState *)opaque;
     uint32_t val;
     int i;

     if (version_id != 1)
         return -EINVAL;

     val = qemu_get_be32(f);
     if (val != s->fifo_size)
         return -EINVAL;

     val = qemu_get_be32(f);
     if (val != s->absolute)
         return -EINVAL;

     s->int_enabled = qemu_get_be32(f);
     s->read_pos = qemu_get_be32(f);
     s->read_count = qemu_get_be32(f);
     for (i = 0; i < s->fifo_size; i++) {
         s->event_fifo[i].x = qemu_get_be32(f);
         s->event_fifo[i].y = qemu_get_be32(f);
         s->event_fifo[i].z = qemu_get_be32(f);
         s->event_fifo[i].pointer_buttons = qemu_get_be32(f);
     }
     return 0;
 }

 static void syborg_pointer_init(SysBusDevice *dev)
 {
     SyborgPointerState *s = FROM_SYSBUS(SyborgPointerState, dev);
     int iomemtype;

     sysbus_init_irq(dev, &s->irq);
     iomemtype = cpu_register_io_memory(0, syborg_pointer_readfn,
 				       syborg_pointer_writefn, s);
     sysbus_init_mmio(dev, 0x1000, iomemtype);

     s->absolute = qdev_get_prop_int(&dev->qdev, "absolute", 1);
     s->fifo_size = qdev_get_prop_int(&dev->qdev, "fifo-size", 16);
     if (s->fifo_size <= 0) {
         fprintf(stderr, "syborg_pointer: fifo too small\n");
         s->fifo_size = 16;
     }
     s->event_fifo = qemu_mallocz(s->fifo_size * sizeof(s->event_fifo[0]));

     qemu_add_mouse_event_handler(syborg_pointer_event, s, s->absolute,
                                  "Syborg Pointer");

     register_savevm("syborg_pointer", -1, 1,
                     syborg_pointer_save, syborg_pointer_load, s);
 }

 static void syborg_pointer_register_devices(void)
 {
     sysbus_register_dev("syborg,pointer", sizeof(SyborgPointerState),
                         syborg_pointer_init);
 }

 device_init(syborg_pointer_register_devices)
	/*
	* Syborg pointing device (mouse/touchscreen)
	*
	* Copyright (c) 2008 CodeSourcery
	*
	* Permission is hereby granted, free of charge, to any person obtaining a copy
	* of this software and associated documentation files (the "Software"), to deal
	* in the Software without restriction, including without limitation the rights
	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	* copies of the Software, and to permit persons to whom the Software is
	* furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice shall be included in
	* all copies or substantial portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	* THE SOFTWARE.
	*/

	#include "sysbus.h"
	#include "console.h"
	#include "syborg.h"

	enum {
	POINTER_ID = 0,
	POINTER_LATCH = 1,
	POINTER_FIFO_COUNT = 2,
	POINTER_X = 3,
	POINTER_Y = 4,
	POINTER_Z = 5,
	POINTER_BUTTONS = 6,
	POINTER_INT_ENABLE = 7,
	POINTER_FIFO_SIZE = 8
	};

	typedef struct {
	int x, y, z, pointer_buttons;
	} event_data;

	typedef struct {
	SysBusDevice busdev;
	int int_enabled;
	int fifo_size;
	event_data *event_fifo;
	int read_pos, read_count;
	qemu_irq irq;
	int absolute;
	} SyborgPointerState;

	static void syborg_pointer_update(SyborgPointerState *s)
	{
	qemu_set_irq(s->irq, s->read_count && s->int_enabled);
	}

	static uint32_t syborg_pointer_read(void *opaque, target_phys_addr_t offset)
	{
	SyborgPointerState s = (SyborgPointerState )opaque;

	offset &= 0xfff;
	switch (offset >> 2) {
	case POINTER_ID:
	return s->absolute ? SYBORG_ID_TOUCHSCREEN : SYBORG_ID_MOUSE;
	case POINTER_FIFO_COUNT:
	return s->read_count;
	case POINTER_X:
	return s->event_fifo[s->read_pos].x;
	case POINTER_Y:
	return s->event_fifo[s->read_pos].y;
	case POINTER_Z:
	return s->event_fifo[s->read_pos].z;
	case POINTER_BUTTONS:
	return s->event_fifo[s->read_pos].pointer_buttons;
	case POINTER_INT_ENABLE:
	return s->int_enabled;
	case POINTER_FIFO_SIZE:
	return s->fifo_size;
	default:
	cpu_abort(cpu_single_env, "syborg_pointer_read: Bad offset %x\n",
	(int)offset);
	return 0;
	}
	}

	static void syborg_pointer_write(void *opaque, target_phys_addr_t offset,
	uint32_t value)
	{
	SyborgPointerState s = (SyborgPointerState )opaque;

	offset &= 0xfff;
	switch (offset >> 2) {
	case POINTER_LATCH:
	if (s->read_count > 0) {
	s->read_count--;
	if (++s->read_pos == s->fifo_size)
	s->read_pos = 0;
	}
	break;
	case POINTER_INT_ENABLE:
	s->int_enabled = value;
	break;
	default:
	cpu_abort(cpu_single_env, "syborg_pointer_write: Bad offset %x\n",
	(int)offset);
	}
	syborg_pointer_update(s);
	}

	static CPUReadMemoryFunc *syborg_pointer_readfn[] = {
	syborg_pointer_read,
	syborg_pointer_read,
	syborg_pointer_read
	};

	static CPUWriteMemoryFunc *syborg_pointer_writefn[] = {
	syborg_pointer_write,
	syborg_pointer_write,
	syborg_pointer_write
	};

	static void syborg_pointer_event(void *opaque, int dx, int dy, int dz,
	int buttons_state)
	{
	SyborgPointerState s = (SyborgPointerState )opaque;
	int slot = s->read_pos + s->read_count;

	/* This first FIFO entry is used to store current register state. */
	if (s->read_count < s->fifo_size - 1) {
	s->read_count++;
	slot++;
	}

	if (slot >= s->fifo_size)
	slot -= s->fifo_size;

	if (s->read_count == s->fifo_size && !s->absolute) {
	/* Merge existing entries. */
	s->event_fifo[slot].x += dx;
	s->event_fifo[slot].y += dy;
	s->event_fifo[slot].z += dz;
	} else {
	s->event_fifo[slot].x = dx;
	s->event_fifo[slot].y = dy;
	s->event_fifo[slot].z = dz;
	}
	s->event_fifo[slot].pointer_buttons = buttons_state;

	syborg_pointer_update(s);
	}

	static void syborg_pointer_save(QEMUFile f, void opaque)
	{
	SyborgPointerState s = (SyborgPointerState )opaque;
	int i;

	qemu_put_be32(f, s->fifo_size);
	qemu_put_be32(f, s->absolute);
	qemu_put_be32(f, s->int_enabled);
	qemu_put_be32(f, s->read_pos);
	qemu_put_be32(f, s->read_count);
	for (i = 0; i < s->fifo_size; i++) {
	qemu_put_be32(f, s->event_fifo[i].x);
	qemu_put_be32(f, s->event_fifo[i].y);
	qemu_put_be32(f, s->event_fifo[i].z);
	qemu_put_be32(f, s->event_fifo[i].pointer_buttons);
	}
	}

	static int syborg_pointer_load(QEMUFile f, void opaque, int version_id)
	{
	SyborgPointerState s = (SyborgPointerState )opaque;
	uint32_t val;
	int i;

	if (version_id != 1)
	return -EINVAL;

	val = qemu_get_be32(f);
	if (val != s->fifo_size)
	return -EINVAL;

	val = qemu_get_be32(f);
	if (val != s->absolute)
	return -EINVAL;

	s->int_enabled = qemu_get_be32(f);
	s->read_pos = qemu_get_be32(f);
	s->read_count = qemu_get_be32(f);
	for (i = 0; i < s->fifo_size; i++) {
	s->event_fifo[i].x = qemu_get_be32(f);
	s->event_fifo[i].y = qemu_get_be32(f);
	s->event_fifo[i].z = qemu_get_be32(f);
	s->event_fifo[i].pointer_buttons = qemu_get_be32(f);
	}
	return 0;
	}

	static void syborg_pointer_init(SysBusDevice *dev)
	{
	SyborgPointerState *s = FROM_SYSBUS(SyborgPointerState, dev);
	int iomemtype;

	sysbus_init_irq(dev, &s->irq);
	iomemtype = cpu_register_io_memory(0, syborg_pointer_readfn,
	syborg_pointer_writefn, s);
	sysbus_init_mmio(dev, 0x1000, iomemtype);

	s->absolute = qdev_get_prop_int(&dev->qdev, "absolute", 1);
	s->fifo_size = qdev_get_prop_int(&dev->qdev, "fifo-size", 16);
	if (s->fifo_size <= 0) {
	fprintf(stderr, "syborg_pointer: fifo too small\n");
	s->fifo_size = 16;
	}
	s->event_fifo = qemu_mallocz(s->fifo_size * sizeof(s->event_fifo[0]));

	qemu_add_mouse_event_handler(syborg_pointer_event, s, s->absolute,
	"Syborg Pointer");

	register_savevm("syborg_pointer", -1, 1,
	syborg_pointer_save, syborg_pointer_load, s);
	}

	static void syborg_pointer_register_devices(void)
	{
	sysbus_register_dev("syborg,pointer", sizeof(SyborgPointerState),
	syborg_pointer_init);
	}

	device_init(syborg_pointer_register_devices)