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fbdev: fbcon: check if mode can handle new screen

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Check if the mode can properly display the screen.  This will be needed by
drivers where the capability is not constant with each mode.  The function
fb_set_var() will query fbcon the requirement, then it will query the driver
(via a new hook fb_get_caps()) its capability.  If the driver's capability
cannot handle fbcon's requirement, then fb_set_var() will fail.

For example, if a particular driver supports 2 modes where:

mode1 = can only display 8x16 bitmaps
mode2 = can display any bitmap

then if current mode = mode2 and current font = 12x22

fbset <mode1> /* mode1 cannot handle 12x22 */
fbset will fail

Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Antonino A. Daplas 2007-05-08 00:39:37 -07:00 committed by Linus Torvalds
parent e15de77e74
commit 38a3dc5185
3 changed files with 87 additions and 0 deletions
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42
drivers/video/console/fbcon.c
View File

@ -3043,6 +3043,43 @@ static void fbcon_new_modelist(struct fb_info *info)
}
}
static void fbcon_get_requirement(struct fb_info *info,
struct fb_blit_caps *caps)
{
struct vc_data *vc;
struct display *p;
int charcnt;
if (caps->flags) {
int i;
for (i = first_fb_vc; i <= last_fb_vc; i++) {
vc = vc_cons[i].d;
if (vc && vc->vc_mode == KD_TEXT) {
p = &fb_display[i];
caps->x |= 1 << (vc->vc_font.width - 1);
caps->y |= 1 << (vc->vc_font.height - 1);
charcnt = (p->userfont) ?
FNTCHARCNT(p->fontdata) : 256;
if (caps->len < charcnt)
caps->len = charcnt;
}
}
} else {
vc = vc_cons[fg_console].d;
if (vc && vc->vc_mode == KD_TEXT) {
p = &fb_display[fg_console];
caps->x |= 1 << (vc->vc_font.width - 1);
caps->y |= 1 << (vc->vc_font.height - 1);
charcnt = (p->userfont) ?
FNTCHARCNT(p->fontdata) : 256;
if (caps->len < charcnt)
caps->len = charcnt;
}
}
}
static int fbcon_event_notify(struct notifier_block *self,
unsigned long action, void *data)
{
@ -3050,6 +3087,7 @@ static int fbcon_event_notify(struct notifier_block *self,
struct fb_info *info = event->info;
struct fb_videomode *mode;
struct fb_con2fbmap *con2fb;
struct fb_blit_caps *caps;
int ret = 0;
/*
@ -3098,6 +3136,10 @@ static int fbcon_event_notify(struct notifier_block *self,
case FB_EVENT_NEW_MODELIST:
fbcon_new_modelist(info);
break;
case FB_EVENT_GET_REQ:
caps = event->data;
fbcon_get_requirement(info, caps);
break;
}
done:

33
drivers/video/fbmem.c
View File

@ -773,6 +773,29 @@ fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
return 0;
}
static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
u32 activate)
{
struct fb_event event;
struct fb_blit_caps caps, fbcaps;
int err = 0;
memset(&caps, 0, sizeof(caps));
memset(&fbcaps, 0, sizeof(fbcaps));
caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
event.info = info;
event.data = &caps;
fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
info->fbops->fb_get_caps(info, &fbcaps, var);
if (((fbcaps.x ^ caps.x) & caps.x) ||
((fbcaps.y ^ caps.y) & caps.y) ||
(fbcaps.len < caps.len))
err = -EINVAL;
return err;
}
int
fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
{
@ -817,7 +840,15 @@ fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
struct fb_videomode mode;
int err = 0;
if (info->fbops->fb_get_caps) {
err = fb_check_caps(info, var, activate);
if (err)
goto done;
}
info->var = *var;
if (info->fbops->fb_set_par)
info->fbops->fb_set_par(info);
@ -843,6 +874,8 @@ fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
}
}
}
done:
return 0;
}

12
include/linux/fb.h
View File

@ -527,12 +527,20 @@ struct fb_cursor_user {
#define FB_EVENT_MODE_CHANGE_ALL 0x0B
/* A software display blank change occured */
#define FB_EVENT_CONBLANK 0x0C
/* Get drawing requirements */
#define FB_EVENT_GET_REQ 0x0D
struct fb_event {
struct fb_info *info;
void *data;
};
struct fb_blit_caps {
u32 x;
u32 y;
u32 len;
u32 flags;
};
extern int fb_register_client(struct notifier_block *nb);
extern int fb_unregister_client(struct notifier_block *nb);
@ -652,6 +660,10 @@ struct fb_ops {
/* restore saved state */
void (*fb_restore_state)(struct fb_info *info);
/* get capability given var */
void (*fb_get_caps)(struct fb_info *info, struct fb_blit_caps *caps,
struct fb_var_screeninfo *var);
};
#ifdef CONFIG_FB_TILEBLITTING