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video: implement framebuffer console

This patch realizes framebuffer console support for barebox. It
supports colors and enough escape sequences to show the barebox
console and editor properly.

fbconsole mini-HOWTO
====================

1. compile sandbox barebox with

    CONFIG_VIDEO=y
    CONFIG_FRAMEBUFFER_CONSOLE=y
    CONFIG_DRIVER_VIDEO_SDL=y

2. run barebox

3. test fbconsole

    fbconsole0.active=oe

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Antony Pavlov 2015-07-08 12:15:39 +03:00 committed by Sascha Hauer
parent cfec57d898
commit 27f79c05ab
6 changed files with 460 additions and 0 deletions

View File

@ -41,3 +41,11 @@ A typical script to enable the framebuffer could look like this:
# finally enable backlight
gpio_direction_output 42 1
Framebuffer console
-------------------
barebox has framebuffer console support which can be enabled with CONFIG_FRAMEBUFFER_CONSOLE.
When registered each framebuffer device gets a corresponding fbconsole device. The console
can be activated with ``fbconsolex.active=oe``. Depending on compile time options there are
different fonts available. These can be selected with the fbconsolex.font variable. To get a
list of fonts use ``devinfo fbconsolex``.

View File

@ -5,6 +5,12 @@ menuconfig VIDEO
if VIDEO
config FRAMEBUFFER_CONSOLE
bool
select IMAGE_RENDERER
select FONTS
prompt "framebuffer console support"
config DRIVER_VIDEO_ATMEL
bool "Atmel LCDC framebuffer driver"
depends on ARCH_AT91

View File

@ -3,6 +3,7 @@ obj-$(CONFIG_DRIVER_VIDEO_EDID) += edid.o
obj-$(CONFIG_OFDEVICE) += of_display_timing.o
obj-$(CONFIG_DRIVER_VIDEO_BACKLIGHT) += backlight.o
obj-$(CONFIG_DRIVER_VIDEO_BACKLIGHT_PWM) += backlight-pwm.o
obj-$(CONFIG_FRAMEBUFFER_CONSOLE) += fbconsole.o
obj-$(CONFIG_DRIVER_VIDEO_ATMEL) += atmel_lcdfb.o atmel_lcdfb_core.o
obj-$(CONFIG_DRIVER_VIDEO_ATMEL_HLCD) += atmel_hlcdfb.o atmel_lcdfb_core.o

View File

@ -238,6 +238,9 @@ int register_framebuffer(struct fb_info *info)
strerror(-ret));
}
if (IS_ENABLED(CONFIG_FRAMEBUFFER_CONSOLE))
register_fbconsole(info);
return 0;
err_unregister:

440
drivers/video/fbconsole.c Normal file
View File

@ -0,0 +1,440 @@
#include <common.h>
#include <errno.h>
#include <malloc.h>
#include <getopt.h>
#include <fb.h>
#include <gui/image_renderer.h>
#include <gui/graphic_utils.h>
#include <linux/font.h>
enum state_t {
LIT, /* Literal input */
ESC, /* Start of escape sequence */
CSI, /* Reading arguments in "CSI Pn ;...*/
};
struct fbc_priv {
struct console_device cdev;
struct fb_info *fb;
struct screen *sc;
struct param_d *par_font;
int par_font_val;
int font_width, font_height;
const u8 *fontdata;
unsigned int cols, rows;
unsigned int x, y; /* cursor position */
enum state_t state;
int color;
int bgcolor;
#define ANSI_FLAG_INVERT (1 << 0)
#define ANSI_FLAG_BRIGHT (1 << 1)
unsigned flags;
int csipos;
u8 csi[256];
int active;
};
static int fbc_getc(struct console_device *cdev)
{
return 0;
}
static int fbc_tstc(struct console_device *cdev)
{
return 0;
}
static void cls(struct fbc_priv *priv)
{
void *buf = gui_screen_render_buffer(priv->sc);
memset(buf, 0, priv->fb->line_length * priv->fb->yres);
}
struct rgb {
u8 r, g, b;
};
static struct rgb colors[] = {
{ 0, 0, 0 },
{ 205, 0, 0 },
{ 0, 205, 0 },
{ 205, 205, 0 },
{ 0, 0, 238 },
{ 205, 0, 205 },
{ 0, 205, 205 },
{ 229, 229, 229 },
{ 127, 127, 127 },
{ 255, 0, 0 },
{ 0, 255, 0 },
{ 255, 255, 0 },
{ 92, 92, 255 },
{ 255, 0, 255 },
{ 0, 255, 255 },
{ 255, 255, 255 },
};
static void drawchar(struct fbc_priv *priv, int x, int y, char c)
{
void *buf;
int bpp = priv->fb->bits_per_pixel >> 3;
void *adr;
int i;
const char *inbuf;
int line_length;
u32 color, bgcolor;
struct rgb *rgb;
buf = gui_screen_render_buffer(priv->sc);
inbuf = &priv->fontdata[c * priv->font_height];
line_length = priv->fb->line_length;
color = priv->flags & ANSI_FLAG_INVERT ? priv->bgcolor : priv->color;
bgcolor = priv->flags & ANSI_FLAG_INVERT ? priv->color : priv->bgcolor;
if (priv->flags & ANSI_FLAG_BRIGHT)
color += 8;
rgb = &colors[color];
color = gu_rgb_to_pixel(priv->fb, rgb->r, rgb->g, rgb->b, 0xff);
rgb = &colors[bgcolor];
bgcolor = gu_rgb_to_pixel(priv->fb, rgb->r, rgb->g, rgb->b, 0xff);
for (i = 0; i < priv->font_height; i++) {
uint8_t t = inbuf[i];
int j;
adr = buf + line_length * (y * priv->font_height + i) + x * priv->font_width * bpp;
for (j = 0; j < priv->font_width; j++) {
if (t & 0x80)
gu_set_pixel(priv->fb, adr, color);
else
gu_set_pixel(priv->fb, adr, bgcolor);
adr += priv->fb->bits_per_pixel >> 3;
t <<= 1;
}
}
}
static void video_invertchar(struct fbc_priv *priv, int x, int y)
{
void *buf;
buf = gui_screen_render_buffer(priv->sc);
gu_invert_area(priv->fb, buf, x * priv->font_width, y * priv->font_height,
priv->font_width, priv->font_height);
}
static void printchar(struct fbc_priv *priv, int c)
{
video_invertchar(priv, priv->x, priv->y);
switch (c) {
case '\007': /* bell: ignore */
break;
case '\b':
if (priv->x > 0) {
priv->x--;
} else if (priv->y > 0) {
priv->x = priv->cols;
priv->y--;
}
break;
case '\n':
case '\013': /* Vertical tab is the same as Line Feed */
priv->y++;
break;
case '\r':
priv->x = 0;
break;
case '\t':
priv->x = (priv->x + 8) & ~0x3;
break;
default:
drawchar(priv, priv->x, priv->y, c);
gu_screen_blit(priv->sc);
priv->x++;
if (priv->x > priv->cols) {
priv->y++;
priv->x = 0;
}
}
if (priv->y > priv->rows) {
void *buf;
u32 line_length = priv->fb->line_length;
int line_height = line_length * priv->font_height;
buf = gui_screen_render_buffer(priv->sc);
memcpy(buf, buf + line_height, line_height * (priv->rows + 1));
memset(buf + line_height * priv->rows, 0, line_height);
priv->y = priv->rows;
}
video_invertchar(priv, priv->x, priv->y);
return;
}
static void fbc_parse_colors(struct fbc_priv *priv)
{
int code;
char *str;
str = priv->csi;
while (1) {
code = simple_strtoul(str, &str, 10);
switch (code) {
case 0:
priv->flags = 0;
priv->color = 8;
priv->bgcolor = 0;
break;
case 1:
priv->flags |= ANSI_FLAG_BRIGHT;
break;
case 7:
priv->flags |= ANSI_FLAG_INVERT;
break;
case 30 ... 37:
priv->color = code - 30;
break;
case 39:
priv->color = 7;
break;
case 40 ... 47:
priv->bgcolor = code - 40;
break;
case 49:
priv->bgcolor = 0;
break;
}
if (*str != ';')
break;
str++;
}
}
static void fbc_parse_csi(struct fbc_priv *priv)
{
char *end;
unsigned char last;
int pos, i;
last = priv->csi[priv->csipos - 1];
switch (last) {
case 'm':
fbc_parse_colors(priv);
return;
case 'J':
cls(priv);
return;
case 'H':
video_invertchar(priv, priv->x, priv->y);
pos = simple_strtoul(priv->csi, &end, 10);
priv->y = pos ? pos - 1 : 0;
pos = simple_strtoul(end + 1, NULL, 10);
priv->x = pos ? pos - 1 : 0;
video_invertchar(priv, priv->x, priv->y);
case 'K':
pos = simple_strtoul(priv->csi, &end, 10);
video_invertchar(priv, priv->x, priv->y);
switch (pos) {
case 0:
for (i = priv->x; i < priv->cols; i++)
drawchar(priv, i, priv->y, ' ');
break;
case 1:
for (i = 0; i <= priv->x; i++)
drawchar(priv, i, priv->y, ' ');
break;
}
video_invertchar(priv, priv->x, priv->y);
break;
}
}
static void fbc_putc(struct console_device *cdev, char c)
{
struct fbc_priv *priv = container_of(cdev,
struct fbc_priv, cdev);
switch (priv->state) {
case LIT:
switch (c) {
case '\033':
priv->state = ESC;
break;
default:
printchar(priv, c);
}
break;
case ESC:
switch (c) {
case '[':
priv->state = CSI;
priv->csipos = 0;
memset(priv->csi, 0, 6);
break;
}
break;
case CSI:
priv->csi[priv->csipos++] = c;
if (priv->csipos == 255) {
priv->csipos = 0;
priv->state = LIT;
return;
}
switch (c) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
case ';':
case ':':
break;
default:
fbc_parse_csi(priv);
priv->state = LIT;
}
break;
}
}
static int setup_font(struct fbc_priv *priv)
{
struct fb_info *fb = priv->fb;
const struct font_desc *font;
font = find_font_enum(priv->par_font_val);
if (!font) {
return -ENOENT;
}
priv->font_width = font->width;
priv->font_height = font->height;
priv->fontdata = font->data;
priv->rows = fb->yres / priv->font_height - 1;
priv->cols = fb->xres / priv->font_width - 1;
return 0;
}
static int fbc_set_active(struct console_device *cdev, unsigned flags)
{
struct fbc_priv *priv = container_of(cdev,
struct fbc_priv, cdev);
struct fb_info *fb = priv->fb;
int ret;
if (priv->active) {
fb_close(priv->sc);
priv->active = false;
}
if (!(flags & (CONSOLE_STDOUT | CONSOLE_STDERR)))
return 0;
ret = setup_font(priv);
if (ret)
return ret;
priv->sc = fb_create_screen(fb, 0);
if (IS_ERR(priv->sc))
return PTR_ERR(priv->sc);
fb_enable(fb);
priv->state = LIT;
dev_info(priv->cdev.dev, "framebuffer console %dx%d activated\n",
priv->cols + 1, priv->rows + 1);
priv->active = true;
return 0;
}
static int set_font(struct param_d *p, void *vpriv)
{
struct fbc_priv *priv = vpriv;
struct console_device *cdev = &priv->cdev;
if (cdev->f_active & (CONSOLE_STDOUT | CONSOLE_STDERR)) {
cls(priv);
setup_font(priv);
}
return 0;
}
int register_fbconsole(struct fb_info *fb)
{
struct fbc_priv *priv;
struct console_device *cdev;
int ret;
priv = xzalloc(sizeof(*priv));
priv->fb = fb;
priv->x = 0;
priv->y = 0;
priv->color = 7;
priv->bgcolor = 0;
cdev = &priv->cdev;
cdev->dev = &fb->dev;
cdev->tstc = fbc_tstc;
cdev->putc = fbc_putc;
cdev->getc = fbc_getc;
cdev->devname = "fbconsole";
cdev->devid = DEVICE_ID_DYNAMIC;
cdev->set_active = fbc_set_active;
ret = console_register(cdev);
if (ret) {
pr_err("registering failed with %s\n", strerror(-ret));
kfree(priv);
return ret;
}
priv->par_font_val = 0;
priv->par_font = add_param_font(&cdev->class_dev,
set_font, NULL,
&priv->par_font_val, priv);
pr_info("registered as %s%d\n", cdev->class_dev.name, cdev->class_dev.id);
return 0;
}

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@ -163,4 +163,6 @@ int edid_to_display_timings(struct display_timings *, unsigned char *edid);
void *edid_read_i2c(struct i2c_adapter *adapter);
void fb_edid_add_modes(struct fb_info *info);
int register_fbconsole(struct fb_info *fb);
#endif /* __FB_H */