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/*
* IBM ASM Service Processor Device Driver
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Copyright (C) IBM Corporation, 2004
*
* Author: Max Asböck <amax@us.ibm.com>
*
*/
/* Remote mouse and keyboard event handling functions */
#include "ibmasm.h"
#include "remote.h"
int ibmasm_init_remote_queue(struct service_processor *sp)
{
struct remote_queue *q = &sp->remote_queue;
disable_mouse_interrupts(sp);
q->open = 0;
q->size = 0;
q->start = kmalloc(DRIVER_REMOTE_QUEUE_SIZE * sizeof(struct remote_event), GFP_KERNEL);
if (q->start == 0)
return -ENOMEM;
q->end = q->start + DRIVER_REMOTE_QUEUE_SIZE;
q->reader = q->start;
q->writer = q->start;
q->size = DRIVER_REMOTE_QUEUE_SIZE;
init_waitqueue_head(&q->wait);
return 0;
}
void ibmasm_free_remote_queue(struct service_processor *sp)
{
kfree(sp->remote_queue.start);
}
void ibmasm_advance_reader(struct remote_queue *q, unsigned int n)
{
q->reader += n;
if (q->reader >= q->end)
q->reader -= q->size;
}
size_t ibmasm_events_available(struct remote_queue *q)
{
ssize_t diff = q->writer - q->reader;
return (diff >= 0) ? diff : q->end - q->reader;
}
static int space_free(struct remote_queue *q)
{
if (q->reader == q->writer)
return q->size - 1;
return ( (q->reader + q->size - q->writer) % q->size ) - 1;
}
static void set_mouse_event(struct remote_input *input, struct mouse_event *mouse)
{
static char last_buttons = 0;
mouse->x = input->data.mouse.x;
mouse->y = input->data.mouse.y;
if (input->mouse_buttons == REMOTE_MOUSE_DOUBLE_CLICK) {
mouse->buttons = REMOTE_MOUSE_DOUBLE_CLICK;
last_buttons = 0;
return;
}
mouse->transitions = last_buttons ^ input->mouse_buttons;
mouse->buttons = input->mouse_buttons;
last_buttons = input->mouse_buttons;
}
static void set_keyboard_event(struct remote_input *input, struct keyboard_event *keyboard)
{
keyboard->key_code = input->data.keyboard.key_code;
keyboard->key_down = input->data.keyboard.key_down;
}
static int add_to_driver_queue(struct remote_queue *q, struct remote_input *input)
{
struct remote_event *event = q->writer;
if (space_free(q) < 1) {
return 1;
}
switch(input->type) {
case (INPUT_TYPE_MOUSE):
event->type = INPUT_TYPE_MOUSE;
set_mouse_event(input, &event->data.mouse);
break;
case (INPUT_TYPE_KEYBOARD):
event->type = INPUT_TYPE_KEYBOARD;
set_keyboard_event(input, &event->data.keyboard);
break;
default:
return 0;
}
event->type = input->type;
q->writer++;
if (q->writer == q->end)
q->writer = q->start;
return 0;
}
void ibmasm_handle_mouse_interrupt(struct service_processor *sp)
{
unsigned long reader;
unsigned long writer;
struct remote_input input;
reader = get_queue_reader(sp);
writer = get_queue_writer(sp);
while (reader != writer) {
memcpy(&input, (void *)get_queue_entry(sp, reader), sizeof(struct remote_input));
if (add_to_driver_queue(&sp->remote_queue, &input))
break;
reader = advance_queue_reader(sp, reader);
}
wake_up_interruptible(&sp->remote_queue.wait);
}
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