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