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 Asböck <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
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