summaryrefslogtreecommitdiffstats
path: root/firmware/target/hosted/lcd-linuxfb.c
blob: 14c8c30f89c9e15fa643b4e30b291bb7269c9bec (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 *
 * Copyright (C) 2017 Marcin Bukat
 * Copyright (C) 2016 Amaury Pouly
 * Copyright (C) 2019 Roman Stolyarov
 *
 * 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/

#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <linux/fb.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include "lcd.h"
#include "lcd-target.h"
#include "backlight-target.h"
#include "sysfs.h"
#include "panic.h"

static int fd = -1;
static struct fb_var_screeninfo vinfo;
static struct fb_fix_screeninfo finfo;
fb_data *framebuffer = NULL; /* global variable, see lcd-target.h */

static void redraw(void)
{
    ioctl(fd, FBIOPAN_DISPLAY, &vinfo);
}

void lcd_init_device(void)
{
    const char * const fb_dev = "/dev/fb0";
    fd = open(fb_dev, O_RDWR | O_CLOEXEC);
    if(fd < 0)
    {
        panicf("Cannot open framebuffer: %s\n", fb_dev);
    }

    /* get fixed and variable information */
    if(ioctl(fd, FBIOGET_FSCREENINFO, &finfo) < 0)
    {
        panicf("Cannot read framebuffer fixed information");
    }

#if 0
    /* check resolution and framebuffer size */
    if(vinfo.xres != LCD_WIDTH || vinfo.yres != LCD_HEIGHT || vinfo.bits_per_pixel != LCD_DEPTH)
    {
        panicf("Unexpected framebuffer resolution: %dx%dx%d\n", vinfo.xres,
            vinfo.yres, vinfo.bits_per_pixel);
    }
#endif
    /* Note: we use a framebuffer size of width*height*bbp. We cannot trust the
     * values returned by the driver for line_length */

    /* map framebuffer */
    framebuffer = mmap(NULL, FRAMEBUFFER_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
    if((void *)framebuffer == MAP_FAILED)
    {
        panicf("Cannot map framebuffer");
    }

    if(ioctl(fd, FBIOGET_VSCREENINFO, &vinfo) < 0)
    {
        panicf("Cannot read framebuffer variable information");
    }

    memset(framebuffer, 0, finfo.smem_len);

#ifdef HAVE_LCD_ENABLE
    lcd_set_active(true);
#endif
}

#ifdef HAVE_LCD_SHUTDOWN
void lcd_shutdown(void)
{
    munmap(framebuffer, FRAMEBUFFER_SIZE);
    framebuffer = NULL;
    close(fd);
    fd = -1;
}
#endif

#ifdef HAVE_LCD_ENABLE
void lcd_enable(bool on)
{
    if (fd < 0) return;

    if (lcd_active() == on)
        return;

    lcd_set_active(on);

    if (on)
    {
        send_event(LCD_EVENT_ACTIVATION, NULL);
        ioctl(fd, FB_BLANK_UNBLANK);
    }
    else
    {
        memset(framebuffer, 0, finfo.smem_len);
        redraw();
        ioctl(fd, FB_BLANK_POWERDOWN);
    }
}
#endif

extern void lcd_copy_buffer_rect(fb_data *dst, const fb_data *src,
                                 int width, int height);

void lcd_update(void)
{
    if (fd < 0) return;

#ifdef HAVE_LCD_ENABLE
    if (lcd_active())
#endif
    {
        /* Copy the Rockbox framebuffer to the second framebuffer */
        lcd_copy_buffer_rect(LCD_FRAMEBUF_ADDR(0, 0), FBADDR(0,0),
                             LCD_WIDTH*LCD_HEIGHT, 1);
        redraw();
    }
}

void lcd_update_rect(int x, int y, int width, int height)
{
    if (fd < 0) return;

#ifdef HAVE_LCD_ENABLE
    if (lcd_active())
#endif
    {
        fb_data *dst = LCD_FRAMEBUF_ADDR(x, y);
        fb_data * src = FBADDR(x,y);

        /* Copy part of the Rockbox framebuffer to the second framebuffer */
        if (width < LCD_WIDTH)
        {
            /* Not full width - do line-by-line */
            lcd_copy_buffer_rect(dst, src, width, height);
        }
        else
        {
            /* Full width - copy as one line */
            lcd_copy_buffer_rect(dst, src, LCD_WIDTH*height, 1);
        }
        redraw();
    }
}