1 /*
2  * Framebuffer driver for TI OMAP boards
3  *
4  * Copyright (C) 2004 Nokia Corporation
5  * Author: Imre Deak <imre.deak@nokia.com>
6  *
7  * Acknowledgements:
8  *   Alex McMains <aam@ridgerun.com>       - Original driver
9  *   Juha Yrjola <juha.yrjola@nokia.com>   - Original driver and improvements
10  *   Dirk Behme <dirk.behme@de.bosch.com>  - changes for 2.6 kernel API
11  *   Texas Instruments                     - H3 support
12  *
13  * This program is free software; you can redistribute it and/or modify it
14  * under the terms of the GNU General Public License as published by the
15  * Free Software Foundation; either version 2 of the License, or (at your
16  * option) any later version.
17  *
18  * This program is distributed in the hope that it will be useful, but
19  * WITHOUT ANY WARRANTY; without even the implied warranty of
20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
21  * General Public License for more details.
22  *
23  * You should have received a copy of the GNU General Public License along
24  * with this program; if not, write to the Free Software Foundation, Inc.,
25  * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
26  */
27 #include <linux/platform_device.h>
28 #include <linux/mm.h>
29 #include <linux/slab.h>
30 #include <linux/uaccess.h>
31 #include <linux/module.h>
32 
33 #include <linux/omap-dma.h>
34 
35 #include <mach/hardware.h>
36 
37 #include "omapfb.h"
38 #include "lcdc.h"
39 
40 #define MODULE_NAME	"omapfb"
41 
42 static unsigned int	def_accel;
43 static unsigned long	def_vram[OMAPFB_PLANE_NUM];
44 static unsigned int	def_vram_cnt;
45 static unsigned long	def_vxres;
46 static unsigned long	def_vyres;
47 static unsigned int	def_rotate;
48 static unsigned int	def_mirror;
49 
50 #ifdef CONFIG_FB_OMAP_MANUAL_UPDATE
51 static bool		manual_update = 1;
52 #else
53 static bool		manual_update;
54 #endif
55 
56 static struct platform_device	*fbdev_pdev;
57 static struct lcd_panel		*fbdev_panel;
58 static struct omapfb_device	*omapfb_dev;
59 
60 struct caps_table_struct {
61 	unsigned long flag;
62 	const char *name;
63 };
64 
65 static const struct caps_table_struct ctrl_caps[] = {
66 	{ OMAPFB_CAPS_MANUAL_UPDATE,  "manual update" },
67 	{ OMAPFB_CAPS_TEARSYNC,       "tearing synchronization" },
68 	{ OMAPFB_CAPS_PLANE_RELOCATE_MEM, "relocate plane memory" },
69 	{ OMAPFB_CAPS_PLANE_SCALE,    "scale plane" },
70 	{ OMAPFB_CAPS_WINDOW_PIXEL_DOUBLE, "pixel double window" },
71 	{ OMAPFB_CAPS_WINDOW_SCALE,   "scale window" },
72 	{ OMAPFB_CAPS_WINDOW_OVERLAY, "overlay window" },
73 	{ OMAPFB_CAPS_WINDOW_ROTATE,  "rotate window" },
74 	{ OMAPFB_CAPS_SET_BACKLIGHT,  "backlight setting" },
75 };
76 
77 static const struct caps_table_struct color_caps[] = {
78 	{ 1 << OMAPFB_COLOR_RGB565,	"RGB565", },
79 	{ 1 << OMAPFB_COLOR_YUV422,	"YUV422", },
80 	{ 1 << OMAPFB_COLOR_YUV420,	"YUV420", },
81 	{ 1 << OMAPFB_COLOR_CLUT_8BPP,	"CLUT8", },
82 	{ 1 << OMAPFB_COLOR_CLUT_4BPP,	"CLUT4", },
83 	{ 1 << OMAPFB_COLOR_CLUT_2BPP,	"CLUT2", },
84 	{ 1 << OMAPFB_COLOR_CLUT_1BPP,	"CLUT1", },
85 	{ 1 << OMAPFB_COLOR_RGB444,	"RGB444", },
86 	{ 1 << OMAPFB_COLOR_YUY422,	"YUY422", },
87 };
88 
89 static void omapdss_release(struct device *dev)
90 {
91 }
92 
93 /* dummy device for clocks */
94 static struct platform_device omapdss_device = {
95 	.name		= "omapdss_dss",
96 	.id		= -1,
97 	.dev            = {
98 		.release = omapdss_release,
99 	},
100 };
101 
102 /*
103  * ---------------------------------------------------------------------------
104  * LCD panel
105  * ---------------------------------------------------------------------------
106  */
107 extern struct lcd_ctrl hwa742_ctrl;
108 
109 static const struct lcd_ctrl *ctrls[] = {
110 	&omap1_int_ctrl,
111 
112 #ifdef CONFIG_FB_OMAP_LCDC_HWA742
113 	&hwa742_ctrl,
114 #endif
115 };
116 
117 #ifdef CONFIG_FB_OMAP_LCDC_EXTERNAL
118 extern struct lcd_ctrl_extif omap1_ext_if;
119 #endif
120 
121 static void omapfb_rqueue_lock(struct omapfb_device *fbdev)
122 {
123 	mutex_lock(&fbdev->rqueue_mutex);
124 }
125 
126 static void omapfb_rqueue_unlock(struct omapfb_device *fbdev)
127 {
128 	mutex_unlock(&fbdev->rqueue_mutex);
129 }
130 
131 /*
132  * ---------------------------------------------------------------------------
133  * LCD controller and LCD DMA
134  * ---------------------------------------------------------------------------
135  */
136 /*
137  * Allocate resources needed for LCD controller and LCD DMA operations. Video
138  * memory is allocated from system memory according to the virtual display
139  * size, except if a bigger memory size is specified explicitly as a kernel
140  * parameter.
141  */
142 static int ctrl_init(struct omapfb_device *fbdev)
143 {
144 	int r;
145 	int i;
146 
147 	/* kernel/module vram parameters override boot tags/board config */
148 	if (def_vram_cnt) {
149 		for (i = 0; i < def_vram_cnt; i++)
150 			fbdev->mem_desc.region[i].size =
151 				PAGE_ALIGN(def_vram[i]);
152 		fbdev->mem_desc.region_cnt = i;
153 	}
154 
155 	if (!fbdev->mem_desc.region_cnt) {
156 		struct lcd_panel *panel = fbdev->panel;
157 		int def_size;
158 		int bpp = panel->bpp;
159 
160 		/* 12 bpp is packed in 16 bits */
161 		if (bpp == 12)
162 			bpp = 16;
163 		def_size = def_vxres * def_vyres * bpp / 8;
164 		fbdev->mem_desc.region_cnt = 1;
165 		fbdev->mem_desc.region[0].size = PAGE_ALIGN(def_size);
166 	}
167 	r = fbdev->ctrl->init(fbdev, 0, &fbdev->mem_desc);
168 	if (r < 0) {
169 		dev_err(fbdev->dev, "controller initialization failed (%d)\n",
170 			r);
171 		return r;
172 	}
173 
174 #ifdef DEBUG
175 	for (i = 0; i < fbdev->mem_desc.region_cnt; i++) {
176 		dev_dbg(fbdev->dev, "region%d phys %08x virt %p size=%lu\n",
177 			 i,
178 			 fbdev->mem_desc.region[i].paddr,
179 			 fbdev->mem_desc.region[i].vaddr,
180 			 fbdev->mem_desc.region[i].size);
181 	}
182 #endif
183 	return 0;
184 }
185 
186 static void ctrl_cleanup(struct omapfb_device *fbdev)
187 {
188 	fbdev->ctrl->cleanup();
189 }
190 
191 /* Must be called with fbdev->rqueue_mutex held. */
192 static int ctrl_change_mode(struct fb_info *fbi)
193 {
194 	int r;
195 	unsigned long offset;
196 	struct omapfb_plane_struct *plane = fbi->par;
197 	struct omapfb_device *fbdev = plane->fbdev;
198 	struct fb_var_screeninfo *var = &fbi->var;
199 
200 	offset = var->yoffset * fbi->fix.line_length +
201 		 var->xoffset * var->bits_per_pixel / 8;
202 
203 	if (fbdev->ctrl->sync)
204 		fbdev->ctrl->sync();
205 	r = fbdev->ctrl->setup_plane(plane->idx, plane->info.channel_out,
206 				 offset, var->xres_virtual,
207 				 plane->info.pos_x, plane->info.pos_y,
208 				 var->xres, var->yres, plane->color_mode);
209 	if (r < 0)
210 		return r;
211 
212 	if (fbdev->ctrl->set_rotate != NULL) {
213 		r = fbdev->ctrl->set_rotate(var->rotate);
214 		if (r < 0)
215 			return r;
216 	}
217 
218 	if (fbdev->ctrl->set_scale != NULL)
219 		r = fbdev->ctrl->set_scale(plane->idx,
220 				   var->xres, var->yres,
221 				   plane->info.out_width,
222 				   plane->info.out_height);
223 
224 	return r;
225 }
226 
227 /*
228  * ---------------------------------------------------------------------------
229  * fbdev framework callbacks and the ioctl interface
230  * ---------------------------------------------------------------------------
231  */
232 /* Called each time the omapfb device is opened */
233 static int omapfb_open(struct fb_info *info, int user)
234 {
235 	return 0;
236 }
237 
238 static void omapfb_sync(struct fb_info *info);
239 
240 /* Called when the omapfb device is closed. We make sure that any pending
241  * gfx DMA operations are ended, before we return. */
242 static int omapfb_release(struct fb_info *info, int user)
243 {
244 	omapfb_sync(info);
245 	return 0;
246 }
247 
248 /* Store a single color palette entry into a pseudo palette or the hardware
249  * palette if one is available. For now we support only 16bpp and thus store
250  * the entry only to the pseudo palette.
251  */
252 static int _setcolreg(struct fb_info *info, u_int regno, u_int red, u_int green,
253 			u_int blue, u_int transp, int update_hw_pal)
254 {
255 	struct omapfb_plane_struct *plane = info->par;
256 	struct omapfb_device *fbdev = plane->fbdev;
257 	struct fb_var_screeninfo *var = &info->var;
258 	int r = 0;
259 
260 	switch (plane->color_mode) {
261 	case OMAPFB_COLOR_YUV422:
262 	case OMAPFB_COLOR_YUV420:
263 	case OMAPFB_COLOR_YUY422:
264 		r = -EINVAL;
265 		break;
266 	case OMAPFB_COLOR_CLUT_8BPP:
267 	case OMAPFB_COLOR_CLUT_4BPP:
268 	case OMAPFB_COLOR_CLUT_2BPP:
269 	case OMAPFB_COLOR_CLUT_1BPP:
270 		if (fbdev->ctrl->setcolreg)
271 			r = fbdev->ctrl->setcolreg(regno, red, green, blue,
272 							transp, update_hw_pal);
273 		/* Fallthrough */
274 	case OMAPFB_COLOR_RGB565:
275 	case OMAPFB_COLOR_RGB444:
276 		if (r != 0)
277 			break;
278 
279 		if (regno < 16) {
280 			u16 pal;
281 			pal = ((red >> (16 - var->red.length)) <<
282 					var->red.offset) |
283 			      ((green >> (16 - var->green.length)) <<
284 					var->green.offset) |
285 			      (blue >> (16 - var->blue.length));
286 			((u32 *)(info->pseudo_palette))[regno] = pal;
287 		}
288 		break;
289 	default:
290 		BUG();
291 	}
292 	return r;
293 }
294 
295 static int omapfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
296 			    u_int transp, struct fb_info *info)
297 {
298 	return _setcolreg(info, regno, red, green, blue, transp, 1);
299 }
300 
301 static int omapfb_setcmap(struct fb_cmap *cmap, struct fb_info *info)
302 {
303 	int count, index, r;
304 	u16 *red, *green, *blue, *transp;
305 	u16 trans = 0xffff;
306 
307 	red     = cmap->red;
308 	green   = cmap->green;
309 	blue    = cmap->blue;
310 	transp  = cmap->transp;
311 	index   = cmap->start;
312 
313 	for (count = 0; count < cmap->len; count++) {
314 		if (transp)
315 			trans = *transp++;
316 		r = _setcolreg(info, index++, *red++, *green++, *blue++, trans,
317 				count == cmap->len - 1);
318 		if (r != 0)
319 			return r;
320 	}
321 
322 	return 0;
323 }
324 
325 static int omapfb_update_full_screen(struct fb_info *fbi);
326 
327 static int omapfb_blank(int blank, struct fb_info *fbi)
328 {
329 	struct omapfb_plane_struct *plane = fbi->par;
330 	struct omapfb_device *fbdev = plane->fbdev;
331 	int do_update = 0;
332 	int r = 0;
333 
334 	omapfb_rqueue_lock(fbdev);
335 	switch (blank) {
336 	case FB_BLANK_UNBLANK:
337 		if (fbdev->state == OMAPFB_SUSPENDED) {
338 			if (fbdev->ctrl->resume)
339 				fbdev->ctrl->resume();
340 			if (fbdev->panel->enable)
341 				fbdev->panel->enable(fbdev->panel);
342 			fbdev->state = OMAPFB_ACTIVE;
343 			if (fbdev->ctrl->get_update_mode() ==
344 					OMAPFB_MANUAL_UPDATE)
345 				do_update = 1;
346 		}
347 		break;
348 	case FB_BLANK_POWERDOWN:
349 		if (fbdev->state == OMAPFB_ACTIVE) {
350 			if (fbdev->panel->disable)
351 				fbdev->panel->disable(fbdev->panel);
352 			if (fbdev->ctrl->suspend)
353 				fbdev->ctrl->suspend();
354 			fbdev->state = OMAPFB_SUSPENDED;
355 		}
356 		break;
357 	default:
358 		r = -EINVAL;
359 	}
360 	omapfb_rqueue_unlock(fbdev);
361 
362 	if (r == 0 && do_update)
363 		r = omapfb_update_full_screen(fbi);
364 
365 	return r;
366 }
367 
368 static void omapfb_sync(struct fb_info *fbi)
369 {
370 	struct omapfb_plane_struct *plane = fbi->par;
371 	struct omapfb_device *fbdev = plane->fbdev;
372 
373 	omapfb_rqueue_lock(fbdev);
374 	if (fbdev->ctrl->sync)
375 		fbdev->ctrl->sync();
376 	omapfb_rqueue_unlock(fbdev);
377 }
378 
379 /*
380  * Set fb_info.fix fields and also updates fbdev.
381  * When calling this fb_info.var must be set up already.
382  */
383 static void set_fb_fix(struct fb_info *fbi, int from_init)
384 {
385 	struct fb_fix_screeninfo *fix = &fbi->fix;
386 	struct fb_var_screeninfo *var = &fbi->var;
387 	struct omapfb_plane_struct *plane = fbi->par;
388 	struct omapfb_mem_region *rg;
389 	int bpp;
390 
391 	rg = &plane->fbdev->mem_desc.region[plane->idx];
392 	fbi->screen_base	= rg->vaddr;
393 
394 	if (!from_init) {
395 		mutex_lock(&fbi->mm_lock);
396 		fix->smem_start		= rg->paddr;
397 		fix->smem_len		= rg->size;
398 		mutex_unlock(&fbi->mm_lock);
399 	} else {
400 		fix->smem_start		= rg->paddr;
401 		fix->smem_len		= rg->size;
402 	}
403 
404 	fix->type = FB_TYPE_PACKED_PIXELS;
405 	bpp = var->bits_per_pixel;
406 	if (var->nonstd)
407 		fix->visual = FB_VISUAL_PSEUDOCOLOR;
408 	else switch (var->bits_per_pixel) {
409 	case 16:
410 	case 12:
411 		fix->visual = FB_VISUAL_TRUECOLOR;
412 		/* 12bpp is stored in 16 bits */
413 		bpp = 16;
414 		break;
415 	case 1:
416 	case 2:
417 	case 4:
418 	case 8:
419 		fix->visual = FB_VISUAL_PSEUDOCOLOR;
420 		break;
421 	}
422 	fix->accel		= FB_ACCEL_OMAP1610;
423 	fix->line_length	= var->xres_virtual * bpp / 8;
424 }
425 
426 static int set_color_mode(struct omapfb_plane_struct *plane,
427 			  struct fb_var_screeninfo *var)
428 {
429 	switch (var->nonstd) {
430 	case 0:
431 		break;
432 	case OMAPFB_COLOR_YUV422:
433 		var->bits_per_pixel = 16;
434 		plane->color_mode = var->nonstd;
435 		return 0;
436 	case OMAPFB_COLOR_YUV420:
437 		var->bits_per_pixel = 12;
438 		plane->color_mode = var->nonstd;
439 		return 0;
440 	case OMAPFB_COLOR_YUY422:
441 		var->bits_per_pixel = 16;
442 		plane->color_mode = var->nonstd;
443 		return 0;
444 	default:
445 		return -EINVAL;
446 	}
447 
448 	switch (var->bits_per_pixel) {
449 	case 1:
450 		plane->color_mode = OMAPFB_COLOR_CLUT_1BPP;
451 		return 0;
452 	case 2:
453 		plane->color_mode = OMAPFB_COLOR_CLUT_2BPP;
454 		return 0;
455 	case 4:
456 		plane->color_mode = OMAPFB_COLOR_CLUT_4BPP;
457 		return 0;
458 	case 8:
459 		plane->color_mode = OMAPFB_COLOR_CLUT_8BPP;
460 		return 0;
461 	case 12:
462 		var->bits_per_pixel = 16;
463 	case 16:
464 		if (plane->fbdev->panel->bpp == 12)
465 			plane->color_mode = OMAPFB_COLOR_RGB444;
466 		else
467 			plane->color_mode = OMAPFB_COLOR_RGB565;
468 		return 0;
469 	default:
470 		return -EINVAL;
471 	}
472 }
473 
474 /*
475  * Check the values in var against our capabilities and in case of out of
476  * bound values try to adjust them.
477  */
478 static int set_fb_var(struct fb_info *fbi,
479 		      struct fb_var_screeninfo *var)
480 {
481 	int		bpp;
482 	unsigned long	max_frame_size;
483 	unsigned long	line_size;
484 	int		xres_min, xres_max;
485 	int		yres_min, yres_max;
486 	struct omapfb_plane_struct *plane = fbi->par;
487 	struct omapfb_device *fbdev = plane->fbdev;
488 	struct lcd_panel *panel = fbdev->panel;
489 
490 	if (set_color_mode(plane, var) < 0)
491 		return -EINVAL;
492 
493 	bpp = var->bits_per_pixel;
494 	if (plane->color_mode == OMAPFB_COLOR_RGB444)
495 		bpp = 16;
496 
497 	switch (var->rotate) {
498 	case 0:
499 	case 180:
500 		xres_min = OMAPFB_PLANE_XRES_MIN;
501 		xres_max = panel->x_res;
502 		yres_min = OMAPFB_PLANE_YRES_MIN;
503 		yres_max = panel->y_res;
504 		if (cpu_is_omap15xx()) {
505 			var->xres = panel->x_res;
506 			var->yres = panel->y_res;
507 		}
508 		break;
509 	case 90:
510 	case 270:
511 		xres_min = OMAPFB_PLANE_YRES_MIN;
512 		xres_max = panel->y_res;
513 		yres_min = OMAPFB_PLANE_XRES_MIN;
514 		yres_max = panel->x_res;
515 		if (cpu_is_omap15xx()) {
516 			var->xres = panel->y_res;
517 			var->yres = panel->x_res;
518 		}
519 		break;
520 	default:
521 		return -EINVAL;
522 	}
523 
524 	if (var->xres < xres_min)
525 		var->xres = xres_min;
526 	if (var->yres < yres_min)
527 		var->yres = yres_min;
528 	if (var->xres > xres_max)
529 		var->xres = xres_max;
530 	if (var->yres > yres_max)
531 		var->yres = yres_max;
532 
533 	if (var->xres_virtual < var->xres)
534 		var->xres_virtual = var->xres;
535 	if (var->yres_virtual < var->yres)
536 		var->yres_virtual = var->yres;
537 	max_frame_size = fbdev->mem_desc.region[plane->idx].size;
538 	line_size = var->xres_virtual * bpp / 8;
539 	if (line_size * var->yres_virtual > max_frame_size) {
540 		/* Try to keep yres_virtual first */
541 		line_size = max_frame_size / var->yres_virtual;
542 		var->xres_virtual = line_size * 8 / bpp;
543 		if (var->xres_virtual < var->xres) {
544 			/* Still doesn't fit. Shrink yres_virtual too */
545 			var->xres_virtual = var->xres;
546 			line_size = var->xres * bpp / 8;
547 			var->yres_virtual = max_frame_size / line_size;
548 		}
549 		/* Recheck this, as the virtual size changed. */
550 		if (var->xres_virtual < var->xres)
551 			var->xres = var->xres_virtual;
552 		if (var->yres_virtual < var->yres)
553 			var->yres = var->yres_virtual;
554 		if (var->xres < xres_min || var->yres < yres_min)
555 			return -EINVAL;
556 	}
557 	if (var->xres + var->xoffset > var->xres_virtual)
558 		var->xoffset = var->xres_virtual - var->xres;
559 	if (var->yres + var->yoffset > var->yres_virtual)
560 		var->yoffset = var->yres_virtual - var->yres;
561 
562 	if (plane->color_mode == OMAPFB_COLOR_RGB444) {
563 		var->red.offset	  = 8; var->red.length	 = 4;
564 						var->red.msb_right   = 0;
565 		var->green.offset = 4; var->green.length = 4;
566 						var->green.msb_right = 0;
567 		var->blue.offset  = 0; var->blue.length  = 4;
568 						var->blue.msb_right  = 0;
569 	} else {
570 		var->red.offset	 = 11; var->red.length	 = 5;
571 						var->red.msb_right   = 0;
572 		var->green.offset = 5;  var->green.length = 6;
573 						var->green.msb_right = 0;
574 		var->blue.offset = 0;  var->blue.length  = 5;
575 						var->blue.msb_right  = 0;
576 	}
577 
578 	var->height		= -1;
579 	var->width		= -1;
580 	var->grayscale		= 0;
581 
582 	/* pixclock in ps, the rest in pixclock */
583 	var->pixclock		= 10000000 / (panel->pixel_clock / 100);
584 	var->left_margin	= panel->hfp;
585 	var->right_margin	= panel->hbp;
586 	var->upper_margin	= panel->vfp;
587 	var->lower_margin	= panel->vbp;
588 	var->hsync_len		= panel->hsw;
589 	var->vsync_len		= panel->vsw;
590 
591 	/* TODO: get these from panel->config */
592 	var->vmode		= FB_VMODE_NONINTERLACED;
593 	var->sync		= 0;
594 
595 	return 0;
596 }
597 
598 
599 /*
600  * Set new x,y offsets in the virtual display for the visible area and switch
601  * to the new mode.
602  */
603 static int omapfb_pan_display(struct fb_var_screeninfo *var,
604 			       struct fb_info *fbi)
605 {
606 	struct omapfb_plane_struct *plane = fbi->par;
607 	struct omapfb_device *fbdev = plane->fbdev;
608 	int r = 0;
609 
610 	omapfb_rqueue_lock(fbdev);
611 	if (var->xoffset != fbi->var.xoffset ||
612 	    var->yoffset != fbi->var.yoffset) {
613 		struct fb_var_screeninfo *new_var = &fbdev->new_var;
614 
615 		memcpy(new_var, &fbi->var, sizeof(*new_var));
616 		new_var->xoffset = var->xoffset;
617 		new_var->yoffset = var->yoffset;
618 		if (set_fb_var(fbi, new_var))
619 			r = -EINVAL;
620 		else {
621 			memcpy(&fbi->var, new_var, sizeof(*new_var));
622 			ctrl_change_mode(fbi);
623 		}
624 	}
625 	omapfb_rqueue_unlock(fbdev);
626 
627 	return r;
628 }
629 
630 /* Set mirror to vertical axis and switch to the new mode. */
631 static int omapfb_mirror(struct fb_info *fbi, int mirror)
632 {
633 	struct omapfb_plane_struct *plane = fbi->par;
634 	struct omapfb_device *fbdev = plane->fbdev;
635 	int r = 0;
636 
637 	omapfb_rqueue_lock(fbdev);
638 	mirror = mirror ? 1 : 0;
639 	if (cpu_is_omap15xx())
640 		r = -EINVAL;
641 	else if (mirror != plane->info.mirror) {
642 		plane->info.mirror = mirror;
643 		r = ctrl_change_mode(fbi);
644 	}
645 	omapfb_rqueue_unlock(fbdev);
646 
647 	return r;
648 }
649 
650 /*
651  * Check values in var, try to adjust them in case of out of bound values if
652  * possible, or return error.
653  */
654 static int omapfb_check_var(struct fb_var_screeninfo *var, struct fb_info *fbi)
655 {
656 	struct omapfb_plane_struct *plane = fbi->par;
657 	struct omapfb_device *fbdev = plane->fbdev;
658 	int r;
659 
660 	omapfb_rqueue_lock(fbdev);
661 	if (fbdev->ctrl->sync != NULL)
662 		fbdev->ctrl->sync();
663 	r = set_fb_var(fbi, var);
664 	omapfb_rqueue_unlock(fbdev);
665 
666 	return r;
667 }
668 
669 /*
670  * Switch to a new mode. The parameters for it has been check already by
671  * omapfb_check_var.
672  */
673 static int omapfb_set_par(struct fb_info *fbi)
674 {
675 	struct omapfb_plane_struct *plane = fbi->par;
676 	struct omapfb_device *fbdev = plane->fbdev;
677 	int r = 0;
678 
679 	omapfb_rqueue_lock(fbdev);
680 	set_fb_fix(fbi, 0);
681 	r = ctrl_change_mode(fbi);
682 	omapfb_rqueue_unlock(fbdev);
683 
684 	return r;
685 }
686 
687 int omapfb_update_window_async(struct fb_info *fbi,
688 				struct omapfb_update_window *win,
689 				void (*callback)(void *),
690 				void *callback_data)
691 {
692 	int xres, yres;
693 	struct omapfb_plane_struct *plane = fbi->par;
694 	struct omapfb_device *fbdev = plane->fbdev;
695 	struct fb_var_screeninfo *var = &fbi->var;
696 
697 	switch (var->rotate) {
698 	case 0:
699 	case 180:
700 		xres = fbdev->panel->x_res;
701 		yres = fbdev->panel->y_res;
702 		break;
703 	case 90:
704 	case 270:
705 		xres = fbdev->panel->y_res;
706 		yres = fbdev->panel->x_res;
707 		break;
708 	default:
709 		return -EINVAL;
710 	}
711 
712 	if (win->x >= xres || win->y >= yres ||
713 	    win->out_x > xres || win->out_y > yres)
714 		return -EINVAL;
715 
716 	if (!fbdev->ctrl->update_window ||
717 	    fbdev->ctrl->get_update_mode() != OMAPFB_MANUAL_UPDATE)
718 		return -ENODEV;
719 
720 	if (win->x + win->width > xres)
721 		win->width = xres - win->x;
722 	if (win->y + win->height > yres)
723 		win->height = yres - win->y;
724 	if (win->out_x + win->out_width > xres)
725 		win->out_width = xres - win->out_x;
726 	if (win->out_y + win->out_height > yres)
727 		win->out_height = yres - win->out_y;
728 	if (!win->width || !win->height || !win->out_width || !win->out_height)
729 		return 0;
730 
731 	return fbdev->ctrl->update_window(fbi, win, callback, callback_data);
732 }
733 EXPORT_SYMBOL(omapfb_update_window_async);
734 
735 static int omapfb_update_win(struct fb_info *fbi,
736 				struct omapfb_update_window *win)
737 {
738 	struct omapfb_plane_struct *plane = fbi->par;
739 	int ret;
740 
741 	omapfb_rqueue_lock(plane->fbdev);
742 	ret = omapfb_update_window_async(fbi, win, NULL, NULL);
743 	omapfb_rqueue_unlock(plane->fbdev);
744 
745 	return ret;
746 }
747 
748 static int omapfb_update_full_screen(struct fb_info *fbi)
749 {
750 	struct omapfb_plane_struct *plane = fbi->par;
751 	struct omapfb_device *fbdev = plane->fbdev;
752 	struct omapfb_update_window win;
753 	int r;
754 
755 	if (!fbdev->ctrl->update_window ||
756 	    fbdev->ctrl->get_update_mode() != OMAPFB_MANUAL_UPDATE)
757 		return -ENODEV;
758 
759 	win.x = 0;
760 	win.y = 0;
761 	win.width = fbi->var.xres;
762 	win.height = fbi->var.yres;
763 	win.out_x = 0;
764 	win.out_y = 0;
765 	win.out_width = fbi->var.xres;
766 	win.out_height = fbi->var.yres;
767 	win.format = 0;
768 
769 	omapfb_rqueue_lock(fbdev);
770 	r = fbdev->ctrl->update_window(fbi, &win, NULL, NULL);
771 	omapfb_rqueue_unlock(fbdev);
772 
773 	return r;
774 }
775 
776 static int omapfb_setup_plane(struct fb_info *fbi, struct omapfb_plane_info *pi)
777 {
778 	struct omapfb_plane_struct *plane = fbi->par;
779 	struct omapfb_device *fbdev = plane->fbdev;
780 	struct lcd_panel *panel = fbdev->panel;
781 	struct omapfb_plane_info old_info;
782 	int r = 0;
783 
784 	if (pi->pos_x + pi->out_width > panel->x_res ||
785 	    pi->pos_y + pi->out_height > panel->y_res)
786 		return -EINVAL;
787 
788 	omapfb_rqueue_lock(fbdev);
789 	if (pi->enabled && !fbdev->mem_desc.region[plane->idx].size) {
790 		/*
791 		 * This plane's memory was freed, can't enable it
792 		 * until it's reallocated.
793 		 */
794 		r = -EINVAL;
795 		goto out;
796 	}
797 	old_info = plane->info;
798 	plane->info = *pi;
799 	if (pi->enabled) {
800 		r = ctrl_change_mode(fbi);
801 		if (r < 0) {
802 			plane->info = old_info;
803 			goto out;
804 		}
805 	}
806 	r = fbdev->ctrl->enable_plane(plane->idx, pi->enabled);
807 	if (r < 0) {
808 		plane->info = old_info;
809 		goto out;
810 	}
811 out:
812 	omapfb_rqueue_unlock(fbdev);
813 	return r;
814 }
815 
816 static int omapfb_query_plane(struct fb_info *fbi, struct omapfb_plane_info *pi)
817 {
818 	struct omapfb_plane_struct *plane = fbi->par;
819 
820 	*pi = plane->info;
821 	return 0;
822 }
823 
824 static int omapfb_setup_mem(struct fb_info *fbi, struct omapfb_mem_info *mi)
825 {
826 	struct omapfb_plane_struct *plane = fbi->par;
827 	struct omapfb_device *fbdev = plane->fbdev;
828 	struct omapfb_mem_region *rg = &fbdev->mem_desc.region[plane->idx];
829 	size_t size;
830 	int r = 0;
831 
832 	if (fbdev->ctrl->setup_mem == NULL)
833 		return -ENODEV;
834 	if (mi->type != OMAPFB_MEMTYPE_SDRAM)
835 		return -EINVAL;
836 
837 	size = PAGE_ALIGN(mi->size);
838 	omapfb_rqueue_lock(fbdev);
839 	if (plane->info.enabled) {
840 		r = -EBUSY;
841 		goto out;
842 	}
843 	if (rg->size != size || rg->type != mi->type) {
844 		struct fb_var_screeninfo *new_var = &fbdev->new_var;
845 		unsigned long old_size = rg->size;
846 		u8	      old_type = rg->type;
847 		unsigned long paddr;
848 
849 		rg->size = size;
850 		rg->type = mi->type;
851 		/*
852 		 * size == 0 is a special case, for which we
853 		 * don't check / adjust the screen parameters.
854 		 * This isn't a problem since the plane can't
855 		 * be reenabled unless its size is > 0.
856 		 */
857 		if (old_size != size && size) {
858 			if (size) {
859 				memcpy(new_var, &fbi->var, sizeof(*new_var));
860 				r = set_fb_var(fbi, new_var);
861 				if (r < 0)
862 					goto out;
863 			}
864 		}
865 
866 		if (fbdev->ctrl->sync)
867 			fbdev->ctrl->sync();
868 		r = fbdev->ctrl->setup_mem(plane->idx, size, mi->type, &paddr);
869 		if (r < 0) {
870 			/* Revert changes. */
871 			rg->size = old_size;
872 			rg->type = old_type;
873 			goto out;
874 		}
875 		rg->paddr = paddr;
876 
877 		if (old_size != size) {
878 			if (size) {
879 				memcpy(&fbi->var, new_var, sizeof(fbi->var));
880 				set_fb_fix(fbi, 0);
881 			} else {
882 				/*
883 				 * Set these explicitly to indicate that the
884 				 * plane memory is dealloce'd, the other
885 				 * screen parameters in var / fix are invalid.
886 				 */
887 				mutex_lock(&fbi->mm_lock);
888 				fbi->fix.smem_start = 0;
889 				fbi->fix.smem_len = 0;
890 				mutex_unlock(&fbi->mm_lock);
891 			}
892 		}
893 	}
894 out:
895 	omapfb_rqueue_unlock(fbdev);
896 
897 	return r;
898 }
899 
900 static int omapfb_query_mem(struct fb_info *fbi, struct omapfb_mem_info *mi)
901 {
902 	struct omapfb_plane_struct *plane = fbi->par;
903 	struct omapfb_device *fbdev = plane->fbdev;
904 	struct omapfb_mem_region *rg;
905 
906 	rg = &fbdev->mem_desc.region[plane->idx];
907 	memset(mi, 0, sizeof(*mi));
908 	mi->size = rg->size;
909 	mi->type = rg->type;
910 
911 	return 0;
912 }
913 
914 static int omapfb_set_color_key(struct omapfb_device *fbdev,
915 				struct omapfb_color_key *ck)
916 {
917 	int r;
918 
919 	if (!fbdev->ctrl->set_color_key)
920 		return -ENODEV;
921 
922 	omapfb_rqueue_lock(fbdev);
923 	r = fbdev->ctrl->set_color_key(ck);
924 	omapfb_rqueue_unlock(fbdev);
925 
926 	return r;
927 }
928 
929 static int omapfb_get_color_key(struct omapfb_device *fbdev,
930 				struct omapfb_color_key *ck)
931 {
932 	int r;
933 
934 	if (!fbdev->ctrl->get_color_key)
935 		return -ENODEV;
936 
937 	omapfb_rqueue_lock(fbdev);
938 	r = fbdev->ctrl->get_color_key(ck);
939 	omapfb_rqueue_unlock(fbdev);
940 
941 	return r;
942 }
943 
944 static struct blocking_notifier_head omapfb_client_list[OMAPFB_PLANE_NUM];
945 static int notifier_inited;
946 
947 static void omapfb_init_notifier(void)
948 {
949 	int i;
950 
951 	for (i = 0; i < OMAPFB_PLANE_NUM; i++)
952 		BLOCKING_INIT_NOTIFIER_HEAD(&omapfb_client_list[i]);
953 }
954 
955 int omapfb_register_client(struct omapfb_notifier_block *omapfb_nb,
956 				omapfb_notifier_callback_t callback,
957 				void *callback_data)
958 {
959 	int r;
960 
961 	if ((unsigned)omapfb_nb->plane_idx >= OMAPFB_PLANE_NUM)
962 		return -EINVAL;
963 
964 	if (!notifier_inited) {
965 		omapfb_init_notifier();
966 		notifier_inited = 1;
967 	}
968 
969 	omapfb_nb->nb.notifier_call = (int (*)(struct notifier_block *,
970 					unsigned long, void *))callback;
971 	omapfb_nb->data = callback_data;
972 	r = blocking_notifier_chain_register(
973 				&omapfb_client_list[omapfb_nb->plane_idx],
974 				&omapfb_nb->nb);
975 	if (r)
976 		return r;
977 	if (omapfb_dev != NULL &&
978 	    omapfb_dev->ctrl && omapfb_dev->ctrl->bind_client) {
979 		omapfb_dev->ctrl->bind_client(omapfb_nb);
980 	}
981 
982 	return 0;
983 }
984 EXPORT_SYMBOL(omapfb_register_client);
985 
986 int omapfb_unregister_client(struct omapfb_notifier_block *omapfb_nb)
987 {
988 	return blocking_notifier_chain_unregister(
989 		&omapfb_client_list[omapfb_nb->plane_idx], &omapfb_nb->nb);
990 }
991 EXPORT_SYMBOL(omapfb_unregister_client);
992 
993 void omapfb_notify_clients(struct omapfb_device *fbdev, unsigned long event)
994 {
995 	int i;
996 
997 	if (!notifier_inited)
998 		/* no client registered yet */
999 		return;
1000 
1001 	for (i = 0; i < OMAPFB_PLANE_NUM; i++)
1002 		blocking_notifier_call_chain(&omapfb_client_list[i], event,
1003 				    fbdev->fb_info[i]);
1004 }
1005 EXPORT_SYMBOL(omapfb_notify_clients);
1006 
1007 static int omapfb_set_update_mode(struct omapfb_device *fbdev,
1008 				   enum omapfb_update_mode mode)
1009 {
1010 	int r;
1011 
1012 	omapfb_rqueue_lock(fbdev);
1013 	r = fbdev->ctrl->set_update_mode(mode);
1014 	omapfb_rqueue_unlock(fbdev);
1015 
1016 	return r;
1017 }
1018 
1019 static enum omapfb_update_mode omapfb_get_update_mode(struct omapfb_device *fbdev)
1020 {
1021 	int r;
1022 
1023 	omapfb_rqueue_lock(fbdev);
1024 	r = fbdev->ctrl->get_update_mode();
1025 	omapfb_rqueue_unlock(fbdev);
1026 
1027 	return r;
1028 }
1029 
1030 static void omapfb_get_caps(struct omapfb_device *fbdev, int plane,
1031 				     struct omapfb_caps *caps)
1032 {
1033 	memset(caps, 0, sizeof(*caps));
1034 	fbdev->ctrl->get_caps(plane, caps);
1035 	if (fbdev->panel->get_caps)
1036 		caps->ctrl |= fbdev->panel->get_caps(fbdev->panel);
1037 }
1038 
1039 /* For lcd testing */
1040 void omapfb_write_first_pixel(struct omapfb_device *fbdev, u16 pixval)
1041 {
1042 	omapfb_rqueue_lock(fbdev);
1043 	*(u16 *)fbdev->mem_desc.region[0].vaddr = pixval;
1044 	if (fbdev->ctrl->get_update_mode() == OMAPFB_MANUAL_UPDATE) {
1045 		struct omapfb_update_window win;
1046 
1047 		memset(&win, 0, sizeof(win));
1048 		win.width = 2;
1049 		win.height = 2;
1050 		win.out_width = 2;
1051 		win.out_height = 2;
1052 		fbdev->ctrl->update_window(fbdev->fb_info[0], &win, NULL, NULL);
1053 	}
1054 	omapfb_rqueue_unlock(fbdev);
1055 }
1056 EXPORT_SYMBOL(omapfb_write_first_pixel);
1057 
1058 /*
1059  * Ioctl interface. Part of the kernel mode frame buffer API is duplicated
1060  * here to be accessible by user mode code.
1061  */
1062 static int omapfb_ioctl(struct fb_info *fbi, unsigned int cmd,
1063 			unsigned long arg)
1064 {
1065 	struct omapfb_plane_struct *plane = fbi->par;
1066 	struct omapfb_device	*fbdev = plane->fbdev;
1067 	struct fb_ops		*ops = fbi->fbops;
1068 	union {
1069 		struct omapfb_update_window	update_window;
1070 		struct omapfb_plane_info	plane_info;
1071 		struct omapfb_mem_info		mem_info;
1072 		struct omapfb_color_key		color_key;
1073 		enum omapfb_update_mode		update_mode;
1074 		struct omapfb_caps		caps;
1075 		unsigned int		mirror;
1076 		int			plane_out;
1077 		int			enable_plane;
1078 	} p;
1079 	int r = 0;
1080 
1081 	BUG_ON(!ops);
1082 	switch (cmd) {
1083 	case OMAPFB_MIRROR:
1084 		if (get_user(p.mirror, (int __user *)arg))
1085 			r = -EFAULT;
1086 		else
1087 			omapfb_mirror(fbi, p.mirror);
1088 		break;
1089 	case OMAPFB_SYNC_GFX:
1090 		omapfb_sync(fbi);
1091 		break;
1092 	case OMAPFB_VSYNC:
1093 		break;
1094 	case OMAPFB_SET_UPDATE_MODE:
1095 		if (get_user(p.update_mode, (int __user *)arg))
1096 			r = -EFAULT;
1097 		else
1098 			r = omapfb_set_update_mode(fbdev, p.update_mode);
1099 		break;
1100 	case OMAPFB_GET_UPDATE_MODE:
1101 		p.update_mode = omapfb_get_update_mode(fbdev);
1102 		if (put_user(p.update_mode,
1103 					(enum omapfb_update_mode __user *)arg))
1104 			r = -EFAULT;
1105 		break;
1106 	case OMAPFB_UPDATE_WINDOW_OLD:
1107 		if (copy_from_user(&p.update_window, (void __user *)arg,
1108 				   sizeof(struct omapfb_update_window_old)))
1109 			r = -EFAULT;
1110 		else {
1111 			struct omapfb_update_window *u = &p.update_window;
1112 			u->out_x = u->x;
1113 			u->out_y = u->y;
1114 			u->out_width = u->width;
1115 			u->out_height = u->height;
1116 			memset(u->reserved, 0, sizeof(u->reserved));
1117 			r = omapfb_update_win(fbi, u);
1118 		}
1119 		break;
1120 	case OMAPFB_UPDATE_WINDOW:
1121 		if (copy_from_user(&p.update_window, (void __user *)arg,
1122 				   sizeof(p.update_window)))
1123 			r = -EFAULT;
1124 		else
1125 			r = omapfb_update_win(fbi, &p.update_window);
1126 		break;
1127 	case OMAPFB_SETUP_PLANE:
1128 		if (copy_from_user(&p.plane_info, (void __user *)arg,
1129 				   sizeof(p.plane_info)))
1130 			r = -EFAULT;
1131 		else
1132 			r = omapfb_setup_plane(fbi, &p.plane_info);
1133 		break;
1134 	case OMAPFB_QUERY_PLANE:
1135 		if ((r = omapfb_query_plane(fbi, &p.plane_info)) < 0)
1136 			break;
1137 		if (copy_to_user((void __user *)arg, &p.plane_info,
1138 				   sizeof(p.plane_info)))
1139 			r = -EFAULT;
1140 		break;
1141 	case OMAPFB_SETUP_MEM:
1142 		if (copy_from_user(&p.mem_info, (void __user *)arg,
1143 				   sizeof(p.mem_info)))
1144 			r = -EFAULT;
1145 		else
1146 			r = omapfb_setup_mem(fbi, &p.mem_info);
1147 		break;
1148 	case OMAPFB_QUERY_MEM:
1149 		if ((r = omapfb_query_mem(fbi, &p.mem_info)) < 0)
1150 			break;
1151 		if (copy_to_user((void __user *)arg, &p.mem_info,
1152 				   sizeof(p.mem_info)))
1153 			r = -EFAULT;
1154 		break;
1155 	case OMAPFB_SET_COLOR_KEY:
1156 		if (copy_from_user(&p.color_key, (void __user *)arg,
1157 				   sizeof(p.color_key)))
1158 			r = -EFAULT;
1159 		else
1160 			r = omapfb_set_color_key(fbdev, &p.color_key);
1161 		break;
1162 	case OMAPFB_GET_COLOR_KEY:
1163 		if ((r = omapfb_get_color_key(fbdev, &p.color_key)) < 0)
1164 			break;
1165 		if (copy_to_user((void __user *)arg, &p.color_key,
1166 				 sizeof(p.color_key)))
1167 			r = -EFAULT;
1168 		break;
1169 	case OMAPFB_GET_CAPS:
1170 		omapfb_get_caps(fbdev, plane->idx, &p.caps);
1171 		if (copy_to_user((void __user *)arg, &p.caps, sizeof(p.caps)))
1172 			r = -EFAULT;
1173 		break;
1174 	case OMAPFB_LCD_TEST:
1175 		{
1176 			int test_num;
1177 
1178 			if (get_user(test_num, (int __user *)arg)) {
1179 				r = -EFAULT;
1180 				break;
1181 			}
1182 			if (!fbdev->panel->run_test) {
1183 				r = -EINVAL;
1184 				break;
1185 			}
1186 			r = fbdev->panel->run_test(fbdev->panel, test_num);
1187 			break;
1188 		}
1189 	case OMAPFB_CTRL_TEST:
1190 		{
1191 			int test_num;
1192 
1193 			if (get_user(test_num, (int __user *)arg)) {
1194 				r = -EFAULT;
1195 				break;
1196 			}
1197 			if (!fbdev->ctrl->run_test) {
1198 				r = -EINVAL;
1199 				break;
1200 			}
1201 			r = fbdev->ctrl->run_test(test_num);
1202 			break;
1203 		}
1204 	default:
1205 		r = -EINVAL;
1206 	}
1207 
1208 	return r;
1209 }
1210 
1211 static int omapfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
1212 {
1213 	struct omapfb_plane_struct *plane = info->par;
1214 	struct omapfb_device *fbdev = plane->fbdev;
1215 	int r;
1216 
1217 	omapfb_rqueue_lock(fbdev);
1218 	r = fbdev->ctrl->mmap(info, vma);
1219 	omapfb_rqueue_unlock(fbdev);
1220 
1221 	return r;
1222 }
1223 
1224 /*
1225  * Callback table for the frame buffer framework. Some of these pointers
1226  * will be changed according to the current setting of fb_info->accel_flags.
1227  */
1228 static struct fb_ops omapfb_ops = {
1229 	.owner		= THIS_MODULE,
1230 	.fb_open        = omapfb_open,
1231 	.fb_release     = omapfb_release,
1232 	.fb_setcolreg	= omapfb_setcolreg,
1233 	.fb_setcmap	= omapfb_setcmap,
1234 	.fb_fillrect	= cfb_fillrect,
1235 	.fb_copyarea	= cfb_copyarea,
1236 	.fb_imageblit	= cfb_imageblit,
1237 	.fb_blank       = omapfb_blank,
1238 	.fb_ioctl	= omapfb_ioctl,
1239 	.fb_check_var	= omapfb_check_var,
1240 	.fb_set_par	= omapfb_set_par,
1241 	.fb_pan_display = omapfb_pan_display,
1242 };
1243 
1244 /*
1245  * ---------------------------------------------------------------------------
1246  * Sysfs interface
1247  * ---------------------------------------------------------------------------
1248  */
1249 /* omapfbX sysfs entries */
1250 static ssize_t omapfb_show_caps_num(struct device *dev,
1251 				    struct device_attribute *attr, char *buf)
1252 {
1253 	struct omapfb_device *fbdev = dev_get_drvdata(dev);
1254 	int plane;
1255 	size_t size;
1256 	struct omapfb_caps caps;
1257 
1258 	plane = 0;
1259 	size = 0;
1260 	while (size < PAGE_SIZE && plane < OMAPFB_PLANE_NUM) {
1261 		omapfb_get_caps(fbdev, plane, &caps);
1262 		size += snprintf(&buf[size], PAGE_SIZE - size,
1263 			"plane#%d %#010x %#010x %#010x\n",
1264 			plane, caps.ctrl, caps.plane_color, caps.wnd_color);
1265 		plane++;
1266 	}
1267 	return size;
1268 }
1269 
1270 static ssize_t omapfb_show_caps_text(struct device *dev,
1271 				     struct device_attribute *attr, char *buf)
1272 {
1273 	struct omapfb_device *fbdev = dev_get_drvdata(dev);
1274 	int i;
1275 	struct omapfb_caps caps;
1276 	int plane;
1277 	size_t size;
1278 
1279 	plane = 0;
1280 	size = 0;
1281 	while (size < PAGE_SIZE && plane < OMAPFB_PLANE_NUM) {
1282 		omapfb_get_caps(fbdev, plane, &caps);
1283 		size += snprintf(&buf[size], PAGE_SIZE - size,
1284 				 "plane#%d:\n", plane);
1285 		for (i = 0; i < ARRAY_SIZE(ctrl_caps) &&
1286 		     size < PAGE_SIZE; i++) {
1287 			if (ctrl_caps[i].flag & caps.ctrl)
1288 				size += snprintf(&buf[size], PAGE_SIZE - size,
1289 					" %s\n", ctrl_caps[i].name);
1290 		}
1291 		size += snprintf(&buf[size], PAGE_SIZE - size,
1292 				 " plane colors:\n");
1293 		for (i = 0; i < ARRAY_SIZE(color_caps) &&
1294 		     size < PAGE_SIZE; i++) {
1295 			if (color_caps[i].flag & caps.plane_color)
1296 				size += snprintf(&buf[size], PAGE_SIZE - size,
1297 					"  %s\n", color_caps[i].name);
1298 		}
1299 		size += snprintf(&buf[size], PAGE_SIZE - size,
1300 				 " window colors:\n");
1301 		for (i = 0; i < ARRAY_SIZE(color_caps) &&
1302 		     size < PAGE_SIZE; i++) {
1303 			if (color_caps[i].flag & caps.wnd_color)
1304 				size += snprintf(&buf[size], PAGE_SIZE - size,
1305 					"  %s\n", color_caps[i].name);
1306 		}
1307 
1308 		plane++;
1309 	}
1310 	return size;
1311 }
1312 
1313 static DEVICE_ATTR(caps_num, 0444, omapfb_show_caps_num, NULL);
1314 static DEVICE_ATTR(caps_text, 0444, omapfb_show_caps_text, NULL);
1315 
1316 /* panel sysfs entries */
1317 static ssize_t omapfb_show_panel_name(struct device *dev,
1318 				      struct device_attribute *attr, char *buf)
1319 {
1320 	struct omapfb_device *fbdev = dev_get_drvdata(dev);
1321 
1322 	return snprintf(buf, PAGE_SIZE, "%s\n", fbdev->panel->name);
1323 }
1324 
1325 static ssize_t omapfb_show_bklight_level(struct device *dev,
1326 					 struct device_attribute *attr,
1327 					 char *buf)
1328 {
1329 	struct omapfb_device *fbdev = dev_get_drvdata(dev);
1330 	int r;
1331 
1332 	if (fbdev->panel->get_bklight_level) {
1333 		r = snprintf(buf, PAGE_SIZE, "%d\n",
1334 			     fbdev->panel->get_bklight_level(fbdev->panel));
1335 	} else
1336 		r = -ENODEV;
1337 	return r;
1338 }
1339 
1340 static ssize_t omapfb_store_bklight_level(struct device *dev,
1341 					  struct device_attribute *attr,
1342 					  const char *buf, size_t size)
1343 {
1344 	struct omapfb_device *fbdev = dev_get_drvdata(dev);
1345 	int r;
1346 
1347 	if (fbdev->panel->set_bklight_level) {
1348 		unsigned int level;
1349 
1350 		if (sscanf(buf, "%10d", &level) == 1) {
1351 			r = fbdev->panel->set_bklight_level(fbdev->panel,
1352 							    level);
1353 		} else
1354 			r = -EINVAL;
1355 	} else
1356 		r = -ENODEV;
1357 	return r ? r : size;
1358 }
1359 
1360 static ssize_t omapfb_show_bklight_max(struct device *dev,
1361 				       struct device_attribute *attr, char *buf)
1362 {
1363 	struct omapfb_device *fbdev = dev_get_drvdata(dev);
1364 	int r;
1365 
1366 	if (fbdev->panel->get_bklight_level) {
1367 		r = snprintf(buf, PAGE_SIZE, "%d\n",
1368 			     fbdev->panel->get_bklight_max(fbdev->panel));
1369 	} else
1370 		r = -ENODEV;
1371 	return r;
1372 }
1373 
1374 static struct device_attribute dev_attr_panel_name =
1375 	__ATTR(name, 0444, omapfb_show_panel_name, NULL);
1376 static DEVICE_ATTR(backlight_level, 0664,
1377 		   omapfb_show_bklight_level, omapfb_store_bklight_level);
1378 static DEVICE_ATTR(backlight_max, 0444, omapfb_show_bklight_max, NULL);
1379 
1380 static struct attribute *panel_attrs[] = {
1381 	&dev_attr_panel_name.attr,
1382 	&dev_attr_backlight_level.attr,
1383 	&dev_attr_backlight_max.attr,
1384 	NULL,
1385 };
1386 
1387 static const struct attribute_group panel_attr_grp = {
1388 	.name  = "panel",
1389 	.attrs = panel_attrs,
1390 };
1391 
1392 /* ctrl sysfs entries */
1393 static ssize_t omapfb_show_ctrl_name(struct device *dev,
1394 				     struct device_attribute *attr, char *buf)
1395 {
1396 	struct omapfb_device *fbdev = dev_get_drvdata(dev);
1397 
1398 	return snprintf(buf, PAGE_SIZE, "%s\n", fbdev->ctrl->name);
1399 }
1400 
1401 static struct device_attribute dev_attr_ctrl_name =
1402 	__ATTR(name, 0444, omapfb_show_ctrl_name, NULL);
1403 
1404 static struct attribute *ctrl_attrs[] = {
1405 	&dev_attr_ctrl_name.attr,
1406 	NULL,
1407 };
1408 
1409 static const struct attribute_group ctrl_attr_grp = {
1410 	.name  = "ctrl",
1411 	.attrs = ctrl_attrs,
1412 };
1413 
1414 static int omapfb_register_sysfs(struct omapfb_device *fbdev)
1415 {
1416 	int r;
1417 
1418 	if ((r = device_create_file(fbdev->dev, &dev_attr_caps_num)))
1419 		goto fail0;
1420 
1421 	if ((r = device_create_file(fbdev->dev, &dev_attr_caps_text)))
1422 		goto fail1;
1423 
1424 	if ((r = sysfs_create_group(&fbdev->dev->kobj, &panel_attr_grp)))
1425 		goto fail2;
1426 
1427 	if ((r = sysfs_create_group(&fbdev->dev->kobj, &ctrl_attr_grp)))
1428 		goto fail3;
1429 
1430 	return 0;
1431 fail3:
1432 	sysfs_remove_group(&fbdev->dev->kobj, &panel_attr_grp);
1433 fail2:
1434 	device_remove_file(fbdev->dev, &dev_attr_caps_text);
1435 fail1:
1436 	device_remove_file(fbdev->dev, &dev_attr_caps_num);
1437 fail0:
1438 	dev_err(fbdev->dev, "unable to register sysfs interface\n");
1439 	return r;
1440 }
1441 
1442 static void omapfb_unregister_sysfs(struct omapfb_device *fbdev)
1443 {
1444 	sysfs_remove_group(&fbdev->dev->kobj, &ctrl_attr_grp);
1445 	sysfs_remove_group(&fbdev->dev->kobj, &panel_attr_grp);
1446 	device_remove_file(fbdev->dev, &dev_attr_caps_num);
1447 	device_remove_file(fbdev->dev, &dev_attr_caps_text);
1448 }
1449 
1450 /*
1451  * ---------------------------------------------------------------------------
1452  * LDM callbacks
1453  * ---------------------------------------------------------------------------
1454  */
1455 /* Initialize system fb_info object and set the default video mode.
1456  * The frame buffer memory already allocated by lcddma_init
1457  */
1458 static int fbinfo_init(struct omapfb_device *fbdev, struct fb_info *info)
1459 {
1460 	struct fb_var_screeninfo	*var = &info->var;
1461 	struct fb_fix_screeninfo	*fix = &info->fix;
1462 	int				r = 0;
1463 
1464 	info->fbops = &omapfb_ops;
1465 	info->flags = FBINFO_FLAG_DEFAULT;
1466 
1467 	strncpy(fix->id, MODULE_NAME, sizeof(fix->id));
1468 
1469 	info->pseudo_palette = fbdev->pseudo_palette;
1470 
1471 	var->accel_flags  = def_accel ? FB_ACCELF_TEXT : 0;
1472 	var->xres = def_vxres;
1473 	var->yres = def_vyres;
1474 	var->xres_virtual = def_vxres;
1475 	var->yres_virtual = def_vyres;
1476 	var->rotate	  = def_rotate;
1477 	var->bits_per_pixel = fbdev->panel->bpp;
1478 
1479 	set_fb_var(info, var);
1480 	set_fb_fix(info, 1);
1481 
1482 	r = fb_alloc_cmap(&info->cmap, 16, 0);
1483 	if (r != 0)
1484 		dev_err(fbdev->dev, "unable to allocate color map memory\n");
1485 
1486 	return r;
1487 }
1488 
1489 /* Release the fb_info object */
1490 static void fbinfo_cleanup(struct omapfb_device *fbdev, struct fb_info *fbi)
1491 {
1492 	fb_dealloc_cmap(&fbi->cmap);
1493 }
1494 
1495 static void planes_cleanup(struct omapfb_device *fbdev)
1496 {
1497 	int i;
1498 
1499 	for (i = 0; i < fbdev->mem_desc.region_cnt; i++) {
1500 		if (fbdev->fb_info[i] == NULL)
1501 			break;
1502 		fbinfo_cleanup(fbdev, fbdev->fb_info[i]);
1503 		framebuffer_release(fbdev->fb_info[i]);
1504 	}
1505 }
1506 
1507 static int planes_init(struct omapfb_device *fbdev)
1508 {
1509 	struct fb_info *fbi;
1510 	int i;
1511 	int r;
1512 
1513 	for (i = 0; i < fbdev->mem_desc.region_cnt; i++) {
1514 		struct omapfb_plane_struct *plane;
1515 		fbi = framebuffer_alloc(sizeof(struct omapfb_plane_struct),
1516 					fbdev->dev);
1517 		if (fbi == NULL) {
1518 			dev_err(fbdev->dev,
1519 				"unable to allocate memory for plane info\n");
1520 			planes_cleanup(fbdev);
1521 			return -ENOMEM;
1522 		}
1523 		plane = fbi->par;
1524 		plane->idx = i;
1525 		plane->fbdev = fbdev;
1526 		plane->info.mirror = def_mirror;
1527 		fbdev->fb_info[i] = fbi;
1528 
1529 		if ((r = fbinfo_init(fbdev, fbi)) < 0) {
1530 			framebuffer_release(fbi);
1531 			planes_cleanup(fbdev);
1532 			return r;
1533 		}
1534 		plane->info.out_width = fbi->var.xres;
1535 		plane->info.out_height = fbi->var.yres;
1536 	}
1537 	return 0;
1538 }
1539 
1540 /*
1541  * Free driver resources. Can be called to rollback an aborted initialization
1542  * sequence.
1543  */
1544 static void omapfb_free_resources(struct omapfb_device *fbdev, int state)
1545 {
1546 	int i;
1547 
1548 	switch (state) {
1549 	case OMAPFB_ACTIVE:
1550 		for (i = 0; i < fbdev->mem_desc.region_cnt; i++)
1551 			unregister_framebuffer(fbdev->fb_info[i]);
1552 	case 7:
1553 		omapfb_unregister_sysfs(fbdev);
1554 	case 6:
1555 		if (fbdev->panel->disable)
1556 			fbdev->panel->disable(fbdev->panel);
1557 	case 5:
1558 		omapfb_set_update_mode(fbdev, OMAPFB_UPDATE_DISABLED);
1559 	case 4:
1560 		planes_cleanup(fbdev);
1561 	case 3:
1562 		ctrl_cleanup(fbdev);
1563 	case 2:
1564 		if (fbdev->panel->cleanup)
1565 			fbdev->panel->cleanup(fbdev->panel);
1566 	case 1:
1567 		dev_set_drvdata(fbdev->dev, NULL);
1568 		kfree(fbdev);
1569 	case 0:
1570 		/* nothing to free */
1571 		break;
1572 	default:
1573 		BUG();
1574 	}
1575 }
1576 
1577 static int omapfb_find_ctrl(struct omapfb_device *fbdev)
1578 {
1579 	struct omapfb_platform_data *conf;
1580 	char name[17];
1581 	int i;
1582 
1583 	conf = dev_get_platdata(fbdev->dev);
1584 
1585 	fbdev->ctrl = NULL;
1586 
1587 	strncpy(name, conf->lcd.ctrl_name, sizeof(name) - 1);
1588 	name[sizeof(name) - 1] = '\0';
1589 
1590 	if (strcmp(name, "internal") == 0) {
1591 		fbdev->ctrl = fbdev->int_ctrl;
1592 		return 0;
1593 	}
1594 
1595 	for (i = 0; i < ARRAY_SIZE(ctrls); i++) {
1596 		dev_dbg(fbdev->dev, "ctrl %s\n", ctrls[i]->name);
1597 		if (strcmp(ctrls[i]->name, name) == 0) {
1598 			fbdev->ctrl = ctrls[i];
1599 			break;
1600 		}
1601 	}
1602 
1603 	if (fbdev->ctrl == NULL) {
1604 		dev_dbg(fbdev->dev, "ctrl %s not supported\n", name);
1605 		return -1;
1606 	}
1607 
1608 	return 0;
1609 }
1610 
1611 /*
1612  * Called by LDM binding to probe and attach a new device.
1613  * Initialization sequence:
1614  *   1. allocate system omapfb_device structure
1615  *   2. select controller type according to platform configuration
1616  *      init LCD panel
1617  *   3. init LCD controller and LCD DMA
1618  *   4. init system fb_info structure for all planes
1619  *   5. setup video mode for first plane and enable it
1620  *   6. enable LCD panel
1621  *   7. register sysfs attributes
1622  *   OMAPFB_ACTIVE: register system fb_info structure for all planes
1623  */
1624 static int omapfb_do_probe(struct platform_device *pdev,
1625 				struct lcd_panel *panel)
1626 {
1627 	struct omapfb_device	*fbdev = NULL;
1628 	int			init_state;
1629 	unsigned long		phz, hhz, vhz;
1630 	unsigned long		vram;
1631 	int			i;
1632 	int			r = 0;
1633 
1634 	init_state = 0;
1635 
1636 	if (pdev->num_resources != 0) {
1637 		dev_err(&pdev->dev, "probed for an unknown device\n");
1638 		r = -ENODEV;
1639 		goto cleanup;
1640 	}
1641 
1642 	if (dev_get_platdata(&pdev->dev) == NULL) {
1643 		dev_err(&pdev->dev, "missing platform data\n");
1644 		r = -ENOENT;
1645 		goto cleanup;
1646 	}
1647 
1648 	fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
1649 	if (fbdev == NULL) {
1650 		dev_err(&pdev->dev,
1651 			"unable to allocate memory for device info\n");
1652 		r = -ENOMEM;
1653 		goto cleanup;
1654 	}
1655 	init_state++;
1656 
1657 	fbdev->dev = &pdev->dev;
1658 	fbdev->panel = panel;
1659 	fbdev->dssdev = &omapdss_device;
1660 	platform_set_drvdata(pdev, fbdev);
1661 
1662 	mutex_init(&fbdev->rqueue_mutex);
1663 
1664 	fbdev->int_ctrl = &omap1_int_ctrl;
1665 #ifdef CONFIG_FB_OMAP_LCDC_EXTERNAL
1666 	fbdev->ext_if = &omap1_ext_if;
1667 #endif
1668 	if (omapfb_find_ctrl(fbdev) < 0) {
1669 		dev_err(fbdev->dev,
1670 			"LCD controller not found, board not supported\n");
1671 		r = -ENODEV;
1672 		goto cleanup;
1673 	}
1674 
1675 	if (fbdev->panel->init) {
1676 		r = fbdev->panel->init(fbdev->panel, fbdev);
1677 		if (r)
1678 			goto cleanup;
1679 	}
1680 
1681 	pr_info("omapfb: configured for panel %s\n", fbdev->panel->name);
1682 
1683 	def_vxres = def_vxres ? def_vxres : fbdev->panel->x_res;
1684 	def_vyres = def_vyres ? def_vyres : fbdev->panel->y_res;
1685 
1686 	init_state++;
1687 
1688 	r = ctrl_init(fbdev);
1689 	if (r)
1690 		goto cleanup;
1691 	if (fbdev->ctrl->mmap != NULL)
1692 		omapfb_ops.fb_mmap = omapfb_mmap;
1693 	init_state++;
1694 
1695 	r = planes_init(fbdev);
1696 	if (r)
1697 		goto cleanup;
1698 	init_state++;
1699 
1700 #ifdef CONFIG_FB_OMAP_DMA_TUNE
1701 	/* Set DMA priority for EMIFF access to highest */
1702 	omap_set_dma_priority(0, OMAP_DMA_PORT_EMIFF, 15);
1703 #endif
1704 
1705 	r = ctrl_change_mode(fbdev->fb_info[0]);
1706 	if (r) {
1707 		dev_err(fbdev->dev, "mode setting failed\n");
1708 		goto cleanup;
1709 	}
1710 
1711 	/* GFX plane is enabled by default */
1712 	r = fbdev->ctrl->enable_plane(OMAPFB_PLANE_GFX, 1);
1713 	if (r)
1714 		goto cleanup;
1715 
1716 	omapfb_set_update_mode(fbdev, manual_update ?
1717 				   OMAPFB_MANUAL_UPDATE : OMAPFB_AUTO_UPDATE);
1718 	init_state++;
1719 
1720 	if (fbdev->panel->enable) {
1721 		r = fbdev->panel->enable(fbdev->panel);
1722 		if (r)
1723 			goto cleanup;
1724 	}
1725 	init_state++;
1726 
1727 	r = omapfb_register_sysfs(fbdev);
1728 	if (r)
1729 		goto cleanup;
1730 	init_state++;
1731 
1732 	vram = 0;
1733 	for (i = 0; i < fbdev->mem_desc.region_cnt; i++) {
1734 		r = register_framebuffer(fbdev->fb_info[i]);
1735 		if (r != 0) {
1736 			dev_err(fbdev->dev,
1737 				"registering framebuffer %d failed\n", i);
1738 			goto cleanup;
1739 		}
1740 		vram += fbdev->mem_desc.region[i].size;
1741 	}
1742 
1743 	fbdev->state = OMAPFB_ACTIVE;
1744 
1745 	panel = fbdev->panel;
1746 	phz = panel->pixel_clock * 1000;
1747 	hhz = phz * 10 / (panel->hfp + panel->x_res + panel->hbp + panel->hsw);
1748 	vhz = hhz / (panel->vfp + panel->y_res + panel->vbp + panel->vsw);
1749 
1750 	omapfb_dev = fbdev;
1751 
1752 	pr_info("omapfb: Framebuffer initialized. Total vram %lu planes %d\n",
1753 			vram, fbdev->mem_desc.region_cnt);
1754 	pr_info("omapfb: Pixclock %lu kHz hfreq %lu.%lu kHz "
1755 			"vfreq %lu.%lu Hz\n",
1756 			phz / 1000, hhz / 10000, hhz % 10, vhz / 10, vhz % 10);
1757 
1758 	return 0;
1759 
1760 cleanup:
1761 	omapfb_free_resources(fbdev, init_state);
1762 
1763 	return r;
1764 }
1765 
1766 static int omapfb_probe(struct platform_device *pdev)
1767 {
1768 	int r;
1769 
1770 	BUG_ON(fbdev_pdev != NULL);
1771 
1772 	r = platform_device_register(&omapdss_device);
1773 	if (r) {
1774 		dev_err(&pdev->dev, "can't register omapdss device\n");
1775 		return r;
1776 	}
1777 
1778 	/* Delay actual initialization until the LCD is registered */
1779 	fbdev_pdev = pdev;
1780 	if (fbdev_panel != NULL)
1781 		omapfb_do_probe(fbdev_pdev, fbdev_panel);
1782 	return 0;
1783 }
1784 
1785 void omapfb_register_panel(struct lcd_panel *panel)
1786 {
1787 	BUG_ON(fbdev_panel != NULL);
1788 
1789 	fbdev_panel = panel;
1790 	if (fbdev_pdev != NULL)
1791 		omapfb_do_probe(fbdev_pdev, fbdev_panel);
1792 }
1793 EXPORT_SYMBOL_GPL(omapfb_register_panel);
1794 
1795 /* Called when the device is being detached from the driver */
1796 static int omapfb_remove(struct platform_device *pdev)
1797 {
1798 	struct omapfb_device *fbdev = platform_get_drvdata(pdev);
1799 	enum omapfb_state saved_state = fbdev->state;
1800 
1801 	/* FIXME: wait till completion of pending events */
1802 
1803 	fbdev->state = OMAPFB_DISABLED;
1804 	omapfb_free_resources(fbdev, saved_state);
1805 
1806 	platform_device_unregister(&omapdss_device);
1807 	fbdev->dssdev = NULL;
1808 
1809 	return 0;
1810 }
1811 
1812 /* PM suspend */
1813 static int omapfb_suspend(struct platform_device *pdev, pm_message_t mesg)
1814 {
1815 	struct omapfb_device *fbdev = platform_get_drvdata(pdev);
1816 
1817 	if (fbdev != NULL)
1818 		omapfb_blank(FB_BLANK_POWERDOWN, fbdev->fb_info[0]);
1819 	return 0;
1820 }
1821 
1822 /* PM resume */
1823 static int omapfb_resume(struct platform_device *pdev)
1824 {
1825 	struct omapfb_device *fbdev = platform_get_drvdata(pdev);
1826 
1827 	if (fbdev != NULL)
1828 		omapfb_blank(FB_BLANK_UNBLANK, fbdev->fb_info[0]);
1829 	return 0;
1830 }
1831 
1832 static struct platform_driver omapfb_driver = {
1833 	.probe		= omapfb_probe,
1834 	.remove		= omapfb_remove,
1835 	.suspend	= omapfb_suspend,
1836 	.resume		= omapfb_resume,
1837 	.driver		= {
1838 		.name	= MODULE_NAME,
1839 	},
1840 };
1841 
1842 #ifndef MODULE
1843 
1844 /* Process kernel command line parameters */
1845 static int __init omapfb_setup(char *options)
1846 {
1847 	char *this_opt = NULL;
1848 	int r = 0;
1849 
1850 	pr_debug("omapfb: options %s\n", options);
1851 
1852 	if (!options || !*options)
1853 		return 0;
1854 
1855 	while (!r && (this_opt = strsep(&options, ",")) != NULL) {
1856 		if (!strncmp(this_opt, "accel", 5))
1857 			def_accel = 1;
1858 		else if (!strncmp(this_opt, "vram:", 5)) {
1859 			char *suffix;
1860 			unsigned long vram;
1861 			vram = (simple_strtoul(this_opt + 5, &suffix, 0));
1862 			switch (suffix[0]) {
1863 			case '\0':
1864 				break;
1865 			case 'm':
1866 			case 'M':
1867 				vram *= 1024;
1868 				/* Fall through */
1869 			case 'k':
1870 			case 'K':
1871 				vram *= 1024;
1872 				break;
1873 			default:
1874 				pr_debug("omapfb: invalid vram suffix %c\n",
1875 					 suffix[0]);
1876 				r = -1;
1877 			}
1878 			def_vram[def_vram_cnt++] = vram;
1879 		}
1880 		else if (!strncmp(this_opt, "vxres:", 6))
1881 			def_vxres = simple_strtoul(this_opt + 6, NULL, 0);
1882 		else if (!strncmp(this_opt, "vyres:", 6))
1883 			def_vyres = simple_strtoul(this_opt + 6, NULL, 0);
1884 		else if (!strncmp(this_opt, "rotate:", 7))
1885 			def_rotate = (simple_strtoul(this_opt + 7, NULL, 0));
1886 		else if (!strncmp(this_opt, "mirror:", 7))
1887 			def_mirror = (simple_strtoul(this_opt + 7, NULL, 0));
1888 		else if (!strncmp(this_opt, "manual_update", 13))
1889 			manual_update = 1;
1890 		else {
1891 			pr_debug("omapfb: invalid option\n");
1892 			r = -1;
1893 		}
1894 	}
1895 
1896 	return r;
1897 }
1898 
1899 #endif
1900 
1901 /* Register both the driver and the device */
1902 static int __init omapfb_init(void)
1903 {
1904 #ifndef MODULE
1905 	char *option;
1906 
1907 	if (fb_get_options("omapfb", &option))
1908 		return -ENODEV;
1909 	omapfb_setup(option);
1910 #endif
1911 	/* Register the driver with LDM */
1912 	if (platform_driver_register(&omapfb_driver)) {
1913 		pr_debug("failed to register omapfb driver\n");
1914 		return -ENODEV;
1915 	}
1916 
1917 	return 0;
1918 }
1919 
1920 static void __exit omapfb_cleanup(void)
1921 {
1922 	platform_driver_unregister(&omapfb_driver);
1923 }
1924 
1925 module_param_named(accel, def_accel, uint, 0664);
1926 module_param_array_named(vram, def_vram, ulong, &def_vram_cnt, 0664);
1927 module_param_named(vxres, def_vxres, long, 0664);
1928 module_param_named(vyres, def_vyres, long, 0664);
1929 module_param_named(rotate, def_rotate, uint, 0664);
1930 module_param_named(mirror, def_mirror, uint, 0664);
1931 module_param_named(manual_update, manual_update, bool, 0664);
1932 
1933 module_init(omapfb_init);
1934 module_exit(omapfb_cleanup);
1935 
1936 MODULE_DESCRIPTION("TI OMAP framebuffer driver");
1937 MODULE_AUTHOR("Imre Deak <imre.deak@nokia.com>");
1938 MODULE_LICENSE("GPL");
1939