1 2 /* 3 * IBM ASM Service Processor Device Driver 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 18 * 19 * Copyright (C) IBM Corporation, 2004 20 * 21 * Author: Max Asb�ck <amax@us.ibm.com> 22 * 23 */ 24 25 /* Remote mouse and keyboard event handling functions */ 26 27 #include "ibmasm.h" 28 #include "remote.h" 29 30 int ibmasm_init_remote_queue(struct service_processor *sp) 31 { 32 struct remote_queue *q = &sp->remote_queue; 33 34 disable_mouse_interrupts(sp); 35 36 q->open = 0; 37 q->size = 0; 38 39 q->start = kmalloc(DRIVER_REMOTE_QUEUE_SIZE * sizeof(struct remote_event), GFP_KERNEL); 40 if (q->start == 0) 41 return -ENOMEM; 42 43 q->end = q->start + DRIVER_REMOTE_QUEUE_SIZE; 44 q->reader = q->start; 45 q->writer = q->start; 46 q->size = DRIVER_REMOTE_QUEUE_SIZE; 47 init_waitqueue_head(&q->wait); 48 49 return 0; 50 } 51 52 void ibmasm_free_remote_queue(struct service_processor *sp) 53 { 54 kfree(sp->remote_queue.start); 55 } 56 57 void ibmasm_advance_reader(struct remote_queue *q, unsigned int n) 58 { 59 q->reader += n; 60 if (q->reader >= q->end) 61 q->reader -= q->size; 62 } 63 64 size_t ibmasm_events_available(struct remote_queue *q) 65 { 66 ssize_t diff = q->writer - q->reader; 67 68 return (diff >= 0) ? diff : q->end - q->reader; 69 } 70 71 72 static int space_free(struct remote_queue *q) 73 { 74 if (q->reader == q->writer) 75 return q->size - 1; 76 77 return ( (q->reader + q->size - q->writer) % q->size ) - 1; 78 } 79 80 static void set_mouse_event(struct remote_input *input, struct mouse_event *mouse) 81 { 82 static char last_buttons = 0; 83 84 mouse->x = input->data.mouse.x; 85 mouse->y = input->data.mouse.y; 86 87 if (input->mouse_buttons == REMOTE_MOUSE_DOUBLE_CLICK) { 88 mouse->buttons = REMOTE_MOUSE_DOUBLE_CLICK; 89 last_buttons = 0; 90 return; 91 } 92 mouse->transitions = last_buttons ^ input->mouse_buttons; 93 mouse->buttons = input->mouse_buttons; 94 95 last_buttons = input->mouse_buttons; 96 } 97 98 static void set_keyboard_event(struct remote_input *input, struct keyboard_event *keyboard) 99 { 100 keyboard->key_code = input->data.keyboard.key_code; 101 keyboard->key_down = input->data.keyboard.key_down; 102 } 103 104 static int add_to_driver_queue(struct remote_queue *q, struct remote_input *input) 105 { 106 struct remote_event *event = q->writer; 107 108 if (space_free(q) < 1) { 109 return 1; 110 } 111 112 switch(input->type) { 113 case (INPUT_TYPE_MOUSE): 114 event->type = INPUT_TYPE_MOUSE; 115 set_mouse_event(input, &event->data.mouse); 116 break; 117 case (INPUT_TYPE_KEYBOARD): 118 event->type = INPUT_TYPE_KEYBOARD; 119 set_keyboard_event(input, &event->data.keyboard); 120 break; 121 default: 122 return 0; 123 } 124 event->type = input->type; 125 126 q->writer++; 127 if (q->writer == q->end) 128 q->writer = q->start; 129 130 return 0; 131 } 132 133 134 void ibmasm_handle_mouse_interrupt(struct service_processor *sp) 135 { 136 unsigned long reader; 137 unsigned long writer; 138 struct remote_input input; 139 140 reader = get_queue_reader(sp); 141 writer = get_queue_writer(sp); 142 143 while (reader != writer) { 144 memcpy(&input, (void *)get_queue_entry(sp, reader), sizeof(struct remote_input)); 145 146 if (add_to_driver_queue(&sp->remote_queue, &input)) 147 break; 148 149 reader = advance_queue_reader(sp, reader); 150 } 151 wake_up_interruptible(&sp->remote_queue.wait); 152 } 153