diff options
author | Timur Tabi <timur@freescale.com> | 2011-03-21 16:38:49 -0500 |
---|---|---|
committer | Anatolij Gustschin <agust@denx.de> | 2011-04-28 21:31:02 +0200 |
commit | a5dbdc81ea70daa04e49eb0004a0441131a029c6 (patch) | |
tree | 82c8239819c405c007953a3b8d3353d4115f6496 /drivers/video/videomodes.c | |
parent | 74446b63dd4ec386fc5de554d5c4a3536096072f (diff) |
video: parse the video-mode environment variable
Add function video_get_video_mode(), which parses the "video-mode" environment
variable and returns each of its components. The format matches the video=
command-line option used for Linux:
video-mode=<driver>:<xres>x<yres>-<depth>@<freq><,option=string>
<driver> The video driver, ignored by U-Boot
<xres> The X resolution (in pixels) to use.
<yres> The Y resolution (in pixels) to use.
<depth> The color depth (in bits) to use.
<freq> The frequency (in Hz) to use.
<options> A comma-separated list of device-specific options
Signed-off-by: Timur Tabi <timur@freescale.com>
Diffstat (limited to 'drivers/video/videomodes.c')
-rw-r--r-- | drivers/video/videomodes.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/drivers/video/videomodes.c b/drivers/video/videomodes.c index d27ce1d2cd..6fe5811aec 100644 --- a/drivers/video/videomodes.c +++ b/drivers/video/videomodes.c @@ -1,6 +1,7 @@ /* * (C) Copyright 2004 * Pierre Aubert, Staubli Faverges , <p.aubert@staubli.com> + * Copyright 2011 Freescale Semiconductor, Inc. * * See file CREDITS for list of people who contributed to this * project. @@ -73,6 +74,8 @@ ****************************************************************************/ #include <common.h> +#include <linux/ctype.h> + #include "videomodes.h" const struct ctfb_vesa_modes vesa_modes[VESA_MODES_COUNT] = { @@ -206,3 +209,64 @@ int video_get_params (struct ctfb_res_modes *pPar, char *penv) } return bpp; } + +/* + * Parse the 'video-mode' environment variable + * + * Example: "video-mode=fslfb:1280x1024-32@60,monitor=dvi". See + * doc/README.video for more information on how to set the variable. + * + * @xres: returned value of X-resolution + * @yres: returned value of Y-resolution + * @depth: returned value of color depth + * @freq: returned value of monitor frequency + * @options: pointer to any remaining options, or NULL + * + * Returns 1 if valid values were found, 0 otherwise + */ +int video_get_video_mode(unsigned int *xres, unsigned int *yres, + unsigned int *depth, unsigned int *freq, const char **options) +{ + char *p = getenv("video-mode"); + if (!p) + return 0; + + /* Skip over the driver name, which we don't care about. */ + p = strchr(p, ':'); + if (!p) + return 0; + + /* Get the X-resolution*/ + while (*p && !isdigit(*p)) + p++; + *xres = simple_strtoul(p, &p, 10); + if (!*xres) + return 0; + + /* Get the Y-resolution */ + while (*p && !isdigit(*p)) + p++; + *yres = simple_strtoul(p, &p, 10); + if (!*yres) + return 0; + + /* Get the depth */ + while (*p && !isdigit(*p)) + p++; + *depth = simple_strtoul(p, &p, 10); + if (!*depth) + return 0; + + /* Get the frequency */ + while (*p && !isdigit(*p)) + p++; + *freq = simple_strtoul(p, &p, 10); + if (!*freq) + return 0; + + /* Find the extra options, if any */ + p = strchr(p, ','); + *options = p ? p + 1 : NULL; + + return 1; +} |