Really just the subset that is needed by efi_console. Perhaps more will be added later, for example color support would be useful to implement efi_cout_set_attribute().
Signed-off-by: Rob Clark robdclark@gmail.com --- drivers/video/Kconfig | 8 +++ drivers/video/vidconsole-uclass.c | 109 ++++++++++++++++++++++++++++++++++++++ drivers/video/video-uclass.c | 4 +- include/video.h | 7 +++ include/video_console.h | 11 ++++ 5 files changed, 136 insertions(+), 3 deletions(-)
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig index 082cc4a528..add156cb70 100644 --- a/drivers/video/Kconfig +++ b/drivers/video/Kconfig @@ -44,6 +44,14 @@ config VIDEO_BPP32 this option, such displays will not be supported and console output will be empty.
+config VIDEO_ANSI + bool "Support ANSI escape sequences in video console" + depends on DM_VIDEO + default y if DM_VIDEO + help + Enable ANSI escape sequence decoding for a more fully functional + console. + config CONSOLE_NORMAL bool "Support a simple text console" depends on DM_VIDEO diff --git a/drivers/video/vidconsole-uclass.c b/drivers/video/vidconsole-uclass.c index e081d5a0ee..0a88cc0a42 100644 --- a/drivers/video/vidconsole-uclass.c +++ b/drivers/video/vidconsole-uclass.c @@ -9,6 +9,7 @@ */
#include <common.h> +#include <linux/ctype.h> #include <dm.h> #include <video.h> #include <video_console.h> @@ -107,12 +108,120 @@ static void vidconsole_newline(struct udevice *dev) video_sync(dev->parent); }
+static char *parsenum(char *s, int *num) +{ + char *end; + *num = simple_strtol(s, &end, 10); + return end; +} + +/* + * Process a character while accumulating an escape string. Chars are + * accumulated into escape_buf until the end of escape sequence is + * found, at which point the sequence is parsed and processed. + */ +static void vidconsole_escape_char(struct udevice *dev, char ch) +{ + struct vidconsole_priv *priv = dev_get_uclass_priv(dev); + + if (!IS_ENABLED(CONFIG_VIDEO_ANSI)) + goto error; + + /* Sanity checking for bogus ESC sequences: */ + if (priv->escape_len >= sizeof(priv->escape_buf)) + goto error; + if (priv->escape_len == 0 && ch != '[') + goto error; + + priv->escape_buf[priv->escape_len++] = ch; + + /* + * Escape sequences are terminated by a letter, so keep + * accumulating until we get one: + */ + if (!isalpha(ch)) + return; + + /* + * clear escape mode first, otherwise things will get highly + * surprising if you hit any debug prints that come back to + * this console. + */ + priv->escape = 0; + + switch (ch) { + case 'H': + case 'f': { + int row, col; + char *s = priv->escape_buf; + + /* + * Set cursor position: [%d;%df or [%d;%dH + */ + s++; /* [ */ + s = parsenum(s, &row); + s++; /* ; */ + s = parsenum(s, &col); + + priv->ycur = row * priv->y_charsize; + priv->xcur_frac = priv->xstart_frac + + VID_TO_POS(col * priv->x_charsize); + + break; + } + case 'J': { + int mode; + + /* + * Clear part/all screen: + * [J or [0J - clear screen from cursor down + * [1J - clear screen from cursor up + * [2J - clear entire screen + * + * TODO we really only handle entire-screen case, others + * probably require some additions to video-uclass (and + * are not really needed yet by efi_console) + */ + parsenum(priv->escape_buf + 1, &mode); + + if (mode == 2) { + video_clear(dev->parent); + video_sync(dev->parent); + priv->ycur = 0; + priv->xcur_frac = priv->xstart_frac; + } else { + debug("unsupported clear mode: %d\n", mode); + } + break; + } + default: + debug("unrecognized escape sequence: %*s\n", + priv->escape_len, priv->escape_buf); + } + + return; + +error: + /* something went wrong, just revert to normal mode: */ + priv->escape = 0; + return; +} + int vidconsole_put_char(struct udevice *dev, char ch) { struct vidconsole_priv *priv = dev_get_uclass_priv(dev); int ret;
+ if (priv->escape) { + vidconsole_escape_char(dev, ch); + return 0; + } + switch (ch) { + case '\x1b': + priv->escape_len = 0; + priv->escape = 1; + break; case '\a': /* beep */ break; diff --git a/drivers/video/video-uclass.c b/drivers/video/video-uclass.c index 3036e3a1f2..0163039821 100644 --- a/drivers/video/video-uclass.c +++ b/drivers/video/video-uclass.c @@ -87,7 +87,7 @@ int video_reserve(ulong *addrp) return 0; }
-static int video_clear(struct udevice *dev) +void video_clear(struct udevice *dev) { struct video_priv *priv = dev_get_uclass_priv(dev);
@@ -100,8 +100,6 @@ static int video_clear(struct udevice *dev) } else { memset(priv->fb, priv->colour_bg, priv->fb_size); } - - return 0; }
/* Flush video activity to the caches */ diff --git a/include/video.h b/include/video.h index 5b4e78b182..61ff653121 100644 --- a/include/video.h +++ b/include/video.h @@ -115,6 +115,13 @@ struct video_ops { int video_reserve(ulong *addrp);
/** + * video_clear() - Clear a device's frame buffer to background color. + * + * @dev: Device to clear + */ +void video_clear(struct udevice *dev); + +/** * video_sync() - Sync a device's frame buffer with its hardware * * Some frame buffers are cached or have a secondary frame buffer. This diff --git a/include/video_console.h b/include/video_console.h index 26047934da..9dce234bd9 100644 --- a/include/video_console.h +++ b/include/video_console.h @@ -29,6 +29,9 @@ * @xsize_frac: Width of the display in fractional units * @xstart_frac: Left margin for the text console in fractional units * @last_ch: Last character written to the text console on this line + * @escape: TRUE if currently accumulating an ANSI escape sequence + * @escape_len: Length of accumulated escape sequence so far + * @escape_buf: Buffer to accumulate escape sequence */ struct vidconsole_priv { struct stdio_dev sdev; @@ -42,6 +45,14 @@ struct vidconsole_priv { int xsize_frac; int xstart_frac; int last_ch; + /* + * ANSI escape sequences are accumulated character by character, + * starting after the ESC char (0x1b) until the entire sequence + * is consumed at which point it is acted upon. + */ + int escape; + int escape_len; + char escape_buf[32]; };
/**