video/fbdev/vfb.c

71 static int vfb_check_var(struct fb_var_screeninfo *var,
76 static int vfb_pan_display(struct fb_var_screeninfo *var,
109      *  to hardware, it should only verify and adjust var.
111      *  data from it to check this var.
114 static int vfb_check_var(struct fb_var_screeninfo *var,
124 	if (var->vmode & FB_VMODE_CONUPDATE) {
125 		var->vmode |= FB_VMODE_YWRAP;
126 		var->xoffset = info->var.xoffset;
127 		var->yoffset = info->var.yoffset;
133 	if (!var->xres)
134 		var->xres = 1;
135 	if (!var->yres)
136 		var->yres = 1;
137 	if (var->xres > var->xres_virtual)
138 		var->xres_virtual = var->xres;
139 	if (var->yres > var->yres_virtual)
140 		var->yres_virtual = var->yres;
141 	if (var->bits_per_pixel <= 1)
142 		var->bits_per_pixel = 1;
143 	else if (var->bits_per_pixel <= 8)
144 		var->bits_per_pixel = 8;
145 	else if (var->bits_per_pixel <= 16)
146 		var->bits_per_pixel = 16;
147 	else if (var->bits_per_pixel <= 24)
148 		var->bits_per_pixel = 24;
149 	else if (var->bits_per_pixel <= 32)
150 		var->bits_per_pixel = 32;
154 	if (var->xres_virtual < var->xoffset + var->xres)
155 		var->xres_virtual = var->xoffset + var->xres;
156 	if (var->yres_virtual < var->yoffset + var->yres)
157 		var->yres_virtual = var->yoffset + var->yres;
163 	    get_line_length(var->xres_virtual, var->bits_per_pixel);
164 	if (line_length * var->yres_virtual > videomemorysize)
168 	 * Now that we checked it we alter var. The reason being is that the video
172 	switch (var->bits_per_pixel) {
175 		var->red.offset = 0;
176 		var->red.length = 8;
177 		var->green.offset = 0;
178 		var->green.length = 8;
179 		var->blue.offset = 0;
180 		var->blue.length = 8;
181 		var->transp.offset = 0;
182 		var->transp.length = 0;
185 		if (var->transp.length) {
186 			var->red.offset = 0;
187 			var->red.length = 5;
188 			var->green.offset = 5;
189 			var->green.length = 5;
190 			var->blue.offset = 10;
191 			var->blue.length = 5;
192 			var->transp.offset = 15;
193 			var->transp.length = 1;
195 			var->red.offset = 0;
196 			var->red.length = 5;
197 			var->green.offset = 5;
198 			var->green.length = 6;
199 			var->blue.offset = 11;
200 			var->blue.length = 5;
201 			var->transp.offset = 0;
202 			var->transp.length = 0;
206 		var->red.offset = 0;
207 		var->red.length = 8;
208 		var->green.offset = 8;
209 		var->green.length = 8;
210 		var->blue.offset = 16;
211 		var->blue.length = 8;
212 		var->transp.offset = 0;
213 		var->transp.length = 0;
216 		var->red.offset = 0;
217 		var->red.length = 8;
218 		var->green.offset = 8;
219 		var->green.length = 8;
220 		var->blue.offset = 16;
221 		var->blue.length = 8;
222 		var->transp.offset = 24;
223 		var->transp.length = 8;
226 	var->red.msb_right = 0;
227 	var->green.msb_right = 0;
228 	var->blue.msb_right = 0;
229 	var->transp.msb_right = 0;
240 	switch (info->var.bits_per_pixel) {
254 	info->fix.line_length = get_line_length(info->var.xres_virtual,
255 						info->var.bits_per_pixel);
263      *  entries in the var structure). Return != 0 for invalid regno.
276 	if (info->var.grayscale) {
283 	 *   var->{color}.offset contains start of bitfield
284 	 *   var->{color}.length contains length of bitfield
290 	 *    var->{color}.offset is 0 unless the palette index takes less than
293 	 *    var->{color}.length is set so that 1 << length is the number of available
300 	 *    var->{color}.offset contains start of bitfield
301 	 *    var->{color}.length contains length of bitfield
310 		red = CNVT_TOHW(red, info->var.red.length);
311 		green = CNVT_TOHW(green, info->var.green.length);
312 		blue = CNVT_TOHW(blue, info->var.blue.length);
313 		transp = CNVT_TOHW(transp, info->var.transp.length);
331 		v = (red << info->var.red.offset) |
332 		    (green << info->var.green.offset) |
333 		    (blue << info->var.blue.offset) |
334 		    (transp << info->var.transp.offset);
335 		switch (info->var.bits_per_pixel) {
357 static int vfb_pan_display(struct fb_var_screeninfo *var,
360 	if (var->vmode & FB_VMODE_YWRAP) {
361 		if (var->yoffset >= info->var.yres_virtual ||
362 		    var->xoffset)
365 		if (var->xoffset + info->var.xres > info->var.xres_virtual ||
366 		    var->yoffset + info->var.yres > info->var.yres_virtual)
369 	info->var.xoffset = var->xoffset;
370 	info->var.yoffset = var->yoffset;
371 	if (var->vmode & FB_VMODE_YWRAP)
372 		info->var.vmode |= FB_VMODE_YWRAP;
374 		info->var.vmode &= ~FB_VMODE_YWRAP;
446 	if (!fb_find_mode(&info->var, info, mode_option,