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drv_video_init(): simplify logic

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Simplify nesting of drv_video_init() and use a consistent way of
indicating failure / success. Before, it took me some time to realize
which of the returns was due to an error condition and which of them
indicated success.

Signed-off-by: Wolfgang Denk <wd@denx.de>
Cc: Anatolij Gustschin <agust@denx.de>
This commit is contained in:
Wolfgang Denk 2009-05-15 10:07:42 +02:00
parent 1699da6297
commit f62f64692f
1 changed files with 27 additions and 38 deletions
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65
drivers/video/cfb_console.c
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@ -1335,48 +1335,37 @@ int drv_video_init (void)
int skip_dev_init;
device_t console_dev;
skip_dev_init = 0;
/* Init video chip - returns with framebuffer cleared */
if (video_init () == -1)
skip_dev_init = 1;
skip_dev_init = (video_init () == -1);
#ifdef CONFIG_VGA_AS_SINGLE_DEVICE
/* Devices VGA and Keyboard will be assigned seperately */
/* Init vga device */
if (!skip_dev_init) {
memset (&console_dev, 0, sizeof (console_dev));
strcpy (console_dev.name, "vga");
console_dev.ext = DEV_EXT_VIDEO; /* Video extensions */
console_dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_SYSTEM;
console_dev.putc = video_putc; /* 'putc' function */
console_dev.puts = video_puts; /* 'puts' function */
console_dev.tstc = NULL; /* 'tstc' function */
console_dev.getc = NULL; /* 'getc' function */
if (device_register (&console_dev) == 0)
return 1;
}
#else
#if !defined(CONFIG_VGA_AS_SINGLE_DEVICE)
PRINTD ("KBD: Keyboard init ...\n");
if (VIDEO_KBD_INIT_FCT == -1)
skip_dev_init = 1;
skip_dev_init |= (VIDEO_KBD_INIT_FCT == -1);
#endif
/* Init console device */
if (!skip_dev_init) {
memset (&console_dev, 0, sizeof (console_dev));
strcpy (console_dev.name, "vga");
console_dev.ext = DEV_EXT_VIDEO; /* Video extensions */
console_dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
console_dev.putc = video_putc; /* 'putc' function */
console_dev.puts = video_puts; /* 'puts' function */
console_dev.tstc = VIDEO_TSTC_FCT; /* 'tstc' function */
console_dev.getc = VIDEO_GETC_FCT; /* 'getc' function */
if (skip_dev_init)
return 0;
if (device_register (&console_dev) == 0)
return 1;
}
/* Init vga device */
memset (&console_dev, 0, sizeof (console_dev));
strcpy (console_dev.name, "vga");
console_dev.ext = DEV_EXT_VIDEO; /* Video extensions */
console_dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_SYSTEM;
console_dev.putc = video_putc; /* 'putc' function */
console_dev.puts = video_puts; /* 'puts' function */
console_dev.tstc = NULL; /* 'tstc' function */
console_dev.getc = NULL; /* 'getc' function */
#if !defined(CONFIG_VGA_AS_SINGLE_DEVICE)
/* Also init console device */
console_dev.flags |= DEV_FLAGS_INPUT;
console_dev.tstc = VIDEO_TSTC_FCT; /* 'tstc' function */
console_dev.getc = VIDEO_GETC_FCT; /* 'getc' function */
#endif /* CONFIG_VGA_AS_SINGLE_DEVICE */
/* No console dev available */
return 0;
if (device_register (&console_dev) != 0)
return 0;
/* Return success */
return 1;
}