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staging: udlfb: add DPMS support

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Add ability to power off monitor with standard blanking interface

Used by X servers and others to manage power of dislpay

Signed-off-by: Bernie Thompson <bernie@plugable.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Bernie Thompson 2010-09-05 16:35:10 -07:00 committed by Greg Kroah-Hartman
parent d46ecb9f79
commit 9825f70f5c
1 changed files with 23 additions and 19 deletions
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42
drivers/staging/udlfb/udlfb.c
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@ -108,13 +108,16 @@ static char *dlfb_vidreg_unlock(char *buf)
/* /*
* On/Off for driving the DisplayLink framebuffer to the display * On/Off for driving the DisplayLink framebuffer to the display
* 0x00 H and V sync on
* 0x01 H and V sync off (screen blank but powered)
* 0x07 DPMS powerdown (requires modeset to come back)
*/ */
static char *dlfb_enable_hvsync(char *buf, bool enable) static char *dlfb_enable_hvsync(char *buf, bool enable)
{ {
if (enable) if (enable)
return dlfb_set_register(buf, 0x1F, 0x00); return dlfb_set_register(buf, 0x1F, 0x00);
else else
return dlfb_set_register(buf, 0x1F, 0x01); return dlfb_set_register(buf, 0x1F, 0x07);
} }
static char *dlfb_set_color_depth(char *buf, u8 selection) static char *dlfb_set_color_depth(char *buf, u8 selection)
@ -936,30 +939,31 @@ static int dlfb_ops_set_par(struct fb_info *info)
return dlfb_set_video_mode(dev, &info->var); return dlfb_set_video_mode(dev, &info->var);
} }
/*
* In order to come back from full DPMS off, we need to set the mode again
*/
static int dlfb_ops_blank(int blank_mode, struct fb_info *info) static int dlfb_ops_blank(int blank_mode, struct fb_info *info)
{ {
struct dlfb_data *dev = info->par; struct dlfb_data *dev = info->par;
char *bufptr;
struct urb *urb;
urb = dlfb_get_urb(dev);
if (!urb)
return 0;
bufptr = (char *) urb->transfer_buffer;
/* overloading usb_active. UNBLANK can conflict with teardown */
bufptr = dlfb_vidreg_lock(bufptr);
if (blank_mode != FB_BLANK_UNBLANK) { if (blank_mode != FB_BLANK_UNBLANK) {
atomic_set(&dev->usb_active, 0); char *bufptr;
bufptr = dlfb_enable_hvsync(bufptr, false); struct urb *urb;
} else {
atomic_set(&dev->usb_active, 1);
bufptr = dlfb_enable_hvsync(bufptr, true);
}
bufptr = dlfb_vidreg_unlock(bufptr);
dlfb_submit_urb(dev, urb, bufptr - (char *) urb->transfer_buffer); urb = dlfb_get_urb(dev);
if (!urb)
return 0;
bufptr = (char *) urb->transfer_buffer;
bufptr = dlfb_vidreg_lock(bufptr);
bufptr = dlfb_enable_hvsync(bufptr, false);
bufptr = dlfb_vidreg_unlock(bufptr);
dlfb_submit_urb(dev, urb, bufptr -
(char *) urb->transfer_buffer);
} else {
dlfb_set_video_mode(dev, &info->var);
}
return 0; return 0;
} }