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Commit d46ecb9f authored by Bernie Thompson's avatar Bernie Thompson Committed by Greg Kroah-Hartman
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staging: udlfb: fbdev character read and write support 



Restore fbdev character read and write support

Enables access to the framebuffer from simple reads and writes
to /dev/fb0 (or fb1, ...). Low performance, because of extra copy
and because udlfb must scan every pixel for changes. But very
useful for testing and simple image display, etc.

Signed-off-by: default avatarBernie Thompson <bernie@plugable.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent df9be302

drivers/staging/udlfb/udlfb.c

+44 −0
Original line number Original line Diff line number Diff line
@@ -602,6 +602,48 @@ int dlfb_handle_damage(struct dlfb_data *dev, int x, int y, 
	return 0;

	return 0;

}

}





static ssize_t dlfb_ops_read(struct fb_info *info, char __user *buf,

			 size_t count, loff_t *ppos)

{

	ssize_t result = -ENOSYS;



#if defined CONFIG_FB_SYS_FOPS || defined CONFIG_FB_SYS_FOPS_MODULE

	result = fb_sys_read(info, buf, count, ppos);

#endif



	return result;

}



/*

 * Path triggered by usermode clients who write to filesystem

 * e.g. cat filename > /dev/fb1

 * Not used by X Windows or text-mode console. But useful for testing.

 * Slow because of extra copy and we must assume all pixels dirty.

 */

static ssize_t dlfb_ops_write(struct fb_info *info, const char __user *buf,

			  size_t count, loff_t *ppos)

{

	ssize_t result = -ENOSYS;

	struct dlfb_data *dev = info->par;

	u32 offset = (u32) *ppos;



#if defined CONFIG_FB_SYS_FOPS || defined CONFIG_FB_SYS_FOPS_MODULE



	result = fb_sys_write(info, buf, count, ppos);



	if (result > 0) {

		int start = max((int)(offset / info->fix.line_length) - 1, 0);

		int lines = min((u32)((result / info->fix.line_length) + 1),

				(u32)info->var.yres);



		dlfb_handle_damage(dev, 0, start, info->var.xres,

			lines, info->screen_base);

	}

#endif



	return result;

}



/* hardware has native COPY command (see libdlo), but not worth it for fbcon */

/* hardware has native COPY command (see libdlo), but not worth it for fbcon */

static void dlfb_ops_copyarea(struct fb_info *info,

static void dlfb_ops_copyarea(struct fb_info *info,

				const struct fb_copyarea *area)

				const struct fb_copyarea *area)
@@ -924,6 +966,8 @@ static int dlfb_ops_blank(int blank_mode, struct fb_info *info) 




static struct fb_ops dlfb_ops = {

static struct fb_ops dlfb_ops = {

	.owner = THIS_MODULE,

	.owner = THIS_MODULE,

	.fb_read = dlfb_ops_read,

	.fb_write = dlfb_ops_write,

	.fb_setcolreg = dlfb_ops_setcolreg,

	.fb_setcolreg = dlfb_ops_setcolreg,

	.fb_fillrect = dlfb_ops_fillrect,

	.fb_fillrect = dlfb_ops_fillrect,

	.fb_copyarea = dlfb_ops_copyarea,

	.fb_copyarea = dlfb_ops_copyarea,