Merge master.kernel.org:/home/rmk/linux-2.6-arm
[linux-2.6] / drivers / video / imxfb.c
1 /*
2  *  linux/drivers/video/imxfb.c
3  *
4  *  Freescale i.MX Frame Buffer device driver
5  *
6  *  Copyright (C) 2004 Sascha Hauer, Pengutronix
7  *   Based on acornfb.c Copyright (C) Russell King.
8  *
9  * This file is subject to the terms and conditions of the GNU General Public
10  * License.  See the file COPYING in the main directory of this archive for
11  * more details.
12  *
13  * Please direct your questions and comments on this driver to the following
14  * email address:
15  *
16  *      linux-arm-kernel@lists.arm.linux.org.uk
17  */
18
19 //#define DEBUG 1
20
21 #include <linux/module.h>
22 #include <linux/kernel.h>
23 #include <linux/errno.h>
24 #include <linux/string.h>
25 #include <linux/interrupt.h>
26 #include <linux/slab.h>
27 #include <linux/mm.h>
28 #include <linux/fb.h>
29 #include <linux/delay.h>
30 #include <linux/init.h>
31 #include <linux/ioport.h>
32 #include <linux/cpufreq.h>
33 #include <linux/platform_device.h>
34 #include <linux/dma-mapping.h>
35
36 #include <mach/hardware.h>
37 #include <asm/io.h>
38 #include <mach/imxfb.h>
39
40 /*
41  * Complain if VAR is out of range.
42  */
43 #define DEBUG_VAR 1
44
45 #include "imxfb.h"
46
47 static struct imxfb_rgb def_rgb_16 = {
48         .red    = { .offset = 8,  .length = 4, },
49         .green  = { .offset = 4,  .length = 4, },
50         .blue   = { .offset = 0,  .length = 4, },
51         .transp = { .offset = 0,  .length = 0, },
52 };
53
54 static struct imxfb_rgb def_rgb_8 = {
55         .red    = { .offset = 0,  .length = 8, },
56         .green  = { .offset = 0,  .length = 8, },
57         .blue   = { .offset = 0,  .length = 8, },
58         .transp = { .offset = 0,  .length = 0, },
59 };
60
61 static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info);
62
63 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
64 {
65         chan &= 0xffff;
66         chan >>= 16 - bf->length;
67         return chan << bf->offset;
68 }
69
70 #define LCDC_PALETTE(x) __REG2(IMX_LCDC_BASE+0x800, (x)<<2)
71 static int
72 imxfb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
73                        u_int trans, struct fb_info *info)
74 {
75         struct imxfb_info *fbi = info->par;
76         u_int val, ret = 1;
77
78 #define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
79         if (regno < fbi->palette_size) {
80                 val = (CNVT_TOHW(red, 4) << 8) |
81                       (CNVT_TOHW(green,4) << 4) |
82                       CNVT_TOHW(blue,  4);
83
84                 LCDC_PALETTE(regno) = val;
85                 ret = 0;
86         }
87         return ret;
88 }
89
90 static int
91 imxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
92                    u_int trans, struct fb_info *info)
93 {
94         struct imxfb_info *fbi = info->par;
95         unsigned int val;
96         int ret = 1;
97
98         /*
99          * If inverse mode was selected, invert all the colours
100          * rather than the register number.  The register number
101          * is what you poke into the framebuffer to produce the
102          * colour you requested.
103          */
104         if (fbi->cmap_inverse) {
105                 red   = 0xffff - red;
106                 green = 0xffff - green;
107                 blue  = 0xffff - blue;
108         }
109
110         /*
111          * If greyscale is true, then we convert the RGB value
112          * to greyscale no mater what visual we are using.
113          */
114         if (info->var.grayscale)
115                 red = green = blue = (19595 * red + 38470 * green +
116                                         7471 * blue) >> 16;
117
118         switch (info->fix.visual) {
119         case FB_VISUAL_TRUECOLOR:
120                 /*
121                  * 12 or 16-bit True Colour.  We encode the RGB value
122                  * according to the RGB bitfield information.
123                  */
124                 if (regno < 16) {
125                         u32 *pal = info->pseudo_palette;
126
127                         val  = chan_to_field(red, &info->var.red);
128                         val |= chan_to_field(green, &info->var.green);
129                         val |= chan_to_field(blue, &info->var.blue);
130
131                         pal[regno] = val;
132                         ret = 0;
133                 }
134                 break;
135
136         case FB_VISUAL_STATIC_PSEUDOCOLOR:
137         case FB_VISUAL_PSEUDOCOLOR:
138                 ret = imxfb_setpalettereg(regno, red, green, blue, trans, info);
139                 break;
140         }
141
142         return ret;
143 }
144
145 /*
146  *  imxfb_check_var():
147  *    Round up in the following order: bits_per_pixel, xres,
148  *    yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
149  *    bitfields, horizontal timing, vertical timing.
150  */
151 static int
152 imxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
153 {
154         struct imxfb_info *fbi = info->par;
155         int rgbidx;
156
157         if (var->xres < MIN_XRES)
158                 var->xres = MIN_XRES;
159         if (var->yres < MIN_YRES)
160                 var->yres = MIN_YRES;
161         if (var->xres > fbi->max_xres)
162                 var->xres = fbi->max_xres;
163         if (var->yres > fbi->max_yres)
164                 var->yres = fbi->max_yres;
165         var->xres_virtual = max(var->xres_virtual, var->xres);
166         var->yres_virtual = max(var->yres_virtual, var->yres);
167
168         pr_debug("var->bits_per_pixel=%d\n", var->bits_per_pixel);
169         switch (var->bits_per_pixel) {
170         case 16:
171                 rgbidx = RGB_16;
172                 break;
173         case 8:
174                 rgbidx = RGB_8;
175                 break;
176         default:
177                 rgbidx = RGB_16;
178         }
179
180         /*
181          * Copy the RGB parameters for this display
182          * from the machine specific parameters.
183          */
184         var->red    = fbi->rgb[rgbidx]->red;
185         var->green  = fbi->rgb[rgbidx]->green;
186         var->blue   = fbi->rgb[rgbidx]->blue;
187         var->transp = fbi->rgb[rgbidx]->transp;
188
189         pr_debug("RGBT length = %d:%d:%d:%d\n",
190                 var->red.length, var->green.length, var->blue.length,
191                 var->transp.length);
192
193         pr_debug("RGBT offset = %d:%d:%d:%d\n",
194                 var->red.offset, var->green.offset, var->blue.offset,
195                 var->transp.offset);
196
197         return 0;
198 }
199
200 /*
201  * imxfb_set_par():
202  *      Set the user defined part of the display for the specified console
203  */
204 static int imxfb_set_par(struct fb_info *info)
205 {
206         struct imxfb_info *fbi = info->par;
207         struct fb_var_screeninfo *var = &info->var;
208
209         pr_debug("set_par\n");
210
211         if (var->bits_per_pixel == 16)
212                 info->fix.visual = FB_VISUAL_TRUECOLOR;
213         else if (!fbi->cmap_static)
214                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
215         else {
216                 /*
217                  * Some people have weird ideas about wanting static
218                  * pseudocolor maps.  I suspect their user space
219                  * applications are broken.
220                  */
221                 info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
222         }
223
224         info->fix.line_length = var->xres_virtual *
225                                   var->bits_per_pixel / 8;
226         fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16;
227
228         imxfb_activate_var(var, info);
229
230         return 0;
231 }
232
233 static void imxfb_enable_controller(struct imxfb_info *fbi)
234 {
235         pr_debug("Enabling LCD controller\n");
236
237         /* initialize LCDC */
238         LCDC_RMCR &= ~RMCR_LCDC_EN;             /* just to be safe... */
239
240         LCDC_SSA        = fbi->screen_dma;
241         /* physical screen start address            */
242         LCDC_VPW        = VPW_VPW(fbi->max_xres * fbi->max_bpp / 8 / 4);
243
244         LCDC_POS        = 0x00000000;   /* panning offset 0 (0 pixel offset)        */
245
246         /* disable hardware cursor */
247         LCDC_CPOS       &= ~(CPOS_CC0 | CPOS_CC1);
248
249         LCDC_RMCR = RMCR_LCDC_EN;
250
251         if(fbi->backlight_power)
252                 fbi->backlight_power(1);
253         if(fbi->lcd_power)
254                 fbi->lcd_power(1);
255 }
256
257 static void imxfb_disable_controller(struct imxfb_info *fbi)
258 {
259         pr_debug("Disabling LCD controller\n");
260
261         if(fbi->backlight_power)
262                 fbi->backlight_power(0);
263         if(fbi->lcd_power)
264                 fbi->lcd_power(0);
265
266         LCDC_RMCR = 0;
267 }
268
269 static int imxfb_blank(int blank, struct fb_info *info)
270 {
271         struct imxfb_info *fbi = info->par;
272
273         pr_debug("imxfb_blank: blank=%d\n", blank);
274
275         switch (blank) {
276         case FB_BLANK_POWERDOWN:
277         case FB_BLANK_VSYNC_SUSPEND:
278         case FB_BLANK_HSYNC_SUSPEND:
279         case FB_BLANK_NORMAL:
280                 imxfb_disable_controller(fbi);
281                 break;
282
283         case FB_BLANK_UNBLANK:
284                 imxfb_enable_controller(fbi);
285                 break;
286         }
287         return 0;
288 }
289
290 static struct fb_ops imxfb_ops = {
291         .owner          = THIS_MODULE,
292         .fb_check_var   = imxfb_check_var,
293         .fb_set_par     = imxfb_set_par,
294         .fb_setcolreg   = imxfb_setcolreg,
295         .fb_fillrect    = cfb_fillrect,
296         .fb_copyarea    = cfb_copyarea,
297         .fb_imageblit   = cfb_imageblit,
298         .fb_blank       = imxfb_blank,
299 };
300
301 /*
302  * imxfb_activate_var():
303  *      Configures LCD Controller based on entries in var parameter.  Settings are
304  *      only written to the controller if changes were made.
305  */
306 static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info)
307 {
308         struct imxfb_info *fbi = info->par;
309         pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n",
310                 var->xres, var->hsync_len,
311                 var->left_margin, var->right_margin);
312         pr_debug("var: yres=%d vslen=%d um=%d bm=%d\n",
313                 var->yres, var->vsync_len,
314                 var->upper_margin, var->lower_margin);
315
316 #if DEBUG_VAR
317         if (var->xres < 16        || var->xres > 1024)
318                 printk(KERN_ERR "%s: invalid xres %d\n",
319                         info->fix.id, var->xres);
320         if (var->hsync_len < 1    || var->hsync_len > 64)
321                 printk(KERN_ERR "%s: invalid hsync_len %d\n",
322                         info->fix.id, var->hsync_len);
323         if (var->left_margin > 255)
324                 printk(KERN_ERR "%s: invalid left_margin %d\n",
325                         info->fix.id, var->left_margin);
326         if (var->right_margin > 255)
327                 printk(KERN_ERR "%s: invalid right_margin %d\n",
328                         info->fix.id, var->right_margin);
329         if (var->yres < 1 || var->yres > 511)
330                 printk(KERN_ERR "%s: invalid yres %d\n",
331                         info->fix.id, var->yres);
332         if (var->vsync_len > 100)
333                 printk(KERN_ERR "%s: invalid vsync_len %d\n",
334                         info->fix.id, var->vsync_len);
335         if (var->upper_margin > 63)
336                 printk(KERN_ERR "%s: invalid upper_margin %d\n",
337                         info->fix.id, var->upper_margin);
338         if (var->lower_margin > 255)
339                 printk(KERN_ERR "%s: invalid lower_margin %d\n",
340                         info->fix.id, var->lower_margin);
341 #endif
342
343         LCDC_HCR        = HCR_H_WIDTH(var->hsync_len) |
344                           HCR_H_WAIT_1(var->left_margin) |
345                           HCR_H_WAIT_2(var->right_margin);
346
347         LCDC_VCR        = VCR_V_WIDTH(var->vsync_len) |
348                           VCR_V_WAIT_1(var->upper_margin) |
349                           VCR_V_WAIT_2(var->lower_margin);
350
351         LCDC_SIZE       = SIZE_XMAX(var->xres) | SIZE_YMAX(var->yres);
352         LCDC_PCR        = fbi->pcr;
353         LCDC_PWMR       = fbi->pwmr;
354         LCDC_LSCR1      = fbi->lscr1;
355         LCDC_DMACR      = fbi->dmacr;
356
357         return 0;
358 }
359
360 static void imxfb_setup_gpio(struct imxfb_info *fbi)
361 {
362         int width;
363
364         LCDC_RMCR       &= ~(RMCR_LCDC_EN | RMCR_SELF_REF);
365
366         if( fbi->pcr & PCR_TFT )
367                 width = 16;
368         else
369                 width = 1 << ((fbi->pcr >> 28) & 0x3);
370
371         switch(width) {
372         case 16:
373                 imx_gpio_mode(PD30_PF_LD15);
374                 imx_gpio_mode(PD29_PF_LD14);
375                 imx_gpio_mode(PD28_PF_LD13);
376                 imx_gpio_mode(PD27_PF_LD12);
377                 imx_gpio_mode(PD26_PF_LD11);
378                 imx_gpio_mode(PD25_PF_LD10);
379                 imx_gpio_mode(PD24_PF_LD9);
380                 imx_gpio_mode(PD23_PF_LD8);
381         case 8:
382                 imx_gpio_mode(PD22_PF_LD7);
383                 imx_gpio_mode(PD21_PF_LD6);
384                 imx_gpio_mode(PD20_PF_LD5);
385                 imx_gpio_mode(PD19_PF_LD4);
386         case 4:
387                 imx_gpio_mode(PD18_PF_LD3);
388                 imx_gpio_mode(PD17_PF_LD2);
389         case 2:
390                 imx_gpio_mode(PD16_PF_LD1);
391         case 1:
392                 imx_gpio_mode(PD15_PF_LD0);
393         }
394
395         /* initialize GPIOs */
396         imx_gpio_mode(PD6_PF_LSCLK);
397         imx_gpio_mode(PD11_PF_CONTRAST);
398         imx_gpio_mode(PD14_PF_FLM_VSYNC);
399         imx_gpio_mode(PD13_PF_LP_HSYNC);
400         imx_gpio_mode(PD12_PF_ACD_OE);
401
402         /* These are only needed for Sharp HR TFT displays */
403         if (fbi->pcr & PCR_SHARP) {
404                 imx_gpio_mode(PD7_PF_REV);
405                 imx_gpio_mode(PD8_PF_CLS);
406                 imx_gpio_mode(PD9_PF_PS);
407                 imx_gpio_mode(PD10_PF_SPL_SPR);
408         }
409 }
410
411 #ifdef CONFIG_PM
412 /*
413  * Power management hooks.  Note that we won't be called from IRQ context,
414  * unlike the blank functions above, so we may sleep.
415  */
416 static int imxfb_suspend(struct platform_device *dev, pm_message_t state)
417 {
418         struct imxfb_info *fbi = platform_get_drvdata(dev);
419         pr_debug("%s\n",__func__);
420
421         imxfb_disable_controller(fbi);
422         return 0;
423 }
424
425 static int imxfb_resume(struct platform_device *dev)
426 {
427         struct imxfb_info *fbi = platform_get_drvdata(dev);
428         pr_debug("%s\n",__func__);
429
430         imxfb_enable_controller(fbi);
431         return 0;
432 }
433 #else
434 #define imxfb_suspend   NULL
435 #define imxfb_resume    NULL
436 #endif
437
438 static int __init imxfb_init_fbinfo(struct device *dev)
439 {
440         struct imxfb_mach_info *inf = dev->platform_data;
441         struct fb_info *info = dev_get_drvdata(dev);
442         struct imxfb_info *fbi = info->par;
443
444         pr_debug("%s\n",__func__);
445
446         info->pseudo_palette = kmalloc( sizeof(u32) * 16, GFP_KERNEL);
447         if (!info->pseudo_palette)
448                 return -ENOMEM;
449
450         memset(fbi, 0, sizeof(struct imxfb_info));
451         fbi->dev = dev;
452
453         strlcpy(info->fix.id, IMX_NAME, sizeof(info->fix.id));
454
455         info->fix.type  = FB_TYPE_PACKED_PIXELS;
456         info->fix.type_aux              = 0;
457         info->fix.xpanstep              = 0;
458         info->fix.ypanstep              = 0;
459         info->fix.ywrapstep             = 0;
460         info->fix.accel = FB_ACCEL_NONE;
461
462         info->var.nonstd                = 0;
463         info->var.activate              = FB_ACTIVATE_NOW;
464         info->var.height                = -1;
465         info->var.width = -1;
466         info->var.accel_flags           = 0;
467         info->var.vmode = FB_VMODE_NONINTERLACED;
468
469         info->fbops                     = &imxfb_ops;
470         info->flags                     = FBINFO_FLAG_DEFAULT | FBINFO_READS_FAST;
471
472         fbi->rgb[RGB_16]                = &def_rgb_16;
473         fbi->rgb[RGB_8]                 = &def_rgb_8;
474
475         fbi->max_xres                   = inf->xres;
476         info->var.xres                  = inf->xres;
477         info->var.xres_virtual          = inf->xres;
478         fbi->max_yres                   = inf->yres;
479         info->var.yres                  = inf->yres;
480         info->var.yres_virtual          = inf->yres;
481         fbi->max_bpp                    = inf->bpp;
482         info->var.bits_per_pixel        = inf->bpp;
483         info->var.nonstd                = inf->nonstd;
484         info->var.pixclock              = inf->pixclock;
485         info->var.hsync_len             = inf->hsync_len;
486         info->var.left_margin           = inf->left_margin;
487         info->var.right_margin          = inf->right_margin;
488         info->var.vsync_len             = inf->vsync_len;
489         info->var.upper_margin          = inf->upper_margin;
490         info->var.lower_margin          = inf->lower_margin;
491         info->var.sync                  = inf->sync;
492         info->var.grayscale             = inf->cmap_greyscale;
493         fbi->cmap_inverse               = inf->cmap_inverse;
494         fbi->cmap_static                = inf->cmap_static;
495         fbi->pcr                        = inf->pcr;
496         fbi->lscr1                      = inf->lscr1;
497         fbi->dmacr                      = inf->dmacr;
498         fbi->pwmr                       = inf->pwmr;
499         fbi->lcd_power                  = inf->lcd_power;
500         fbi->backlight_power            = inf->backlight_power;
501         info->fix.smem_len              = fbi->max_xres * fbi->max_yres *
502                                           fbi->max_bpp / 8;
503
504         return 0;
505 }
506
507 /*
508  *      Allocates the DRAM memory for the frame buffer.  This buffer is
509  *      remapped into a non-cached, non-buffered, memory region to
510  *      allow pixel writes to occur without flushing the cache.
511  *      Once this area is remapped, all virtual memory access to the
512  *      video memory should occur at the new region.
513  */
514 static int __init imxfb_map_video_memory(struct fb_info *info)
515 {
516         struct imxfb_info *fbi = info->par;
517
518         fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
519         fbi->map_cpu = dma_alloc_writecombine(fbi->dev, fbi->map_size,
520                                         &fbi->map_dma,GFP_KERNEL);
521
522         if (fbi->map_cpu) {
523                 info->screen_base = fbi->map_cpu;
524                 fbi->screen_cpu = fbi->map_cpu;
525                 fbi->screen_dma = fbi->map_dma;
526                 info->fix.smem_start = fbi->screen_dma;
527         }
528
529         return fbi->map_cpu ? 0 : -ENOMEM;
530 }
531
532 static int __init imxfb_probe(struct platform_device *pdev)
533 {
534         struct imxfb_info *fbi;
535         struct fb_info *info;
536         struct imxfb_mach_info *inf;
537         struct resource *res;
538         int ret;
539
540         printk("i.MX Framebuffer driver\n");
541
542         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
543         if(!res)
544                 return -ENODEV;
545
546         inf = pdev->dev.platform_data;
547         if(!inf) {
548                 dev_err(&pdev->dev,"No platform_data available\n");
549                 return -ENOMEM;
550         }
551
552         info = framebuffer_alloc(sizeof(struct imxfb_info), &pdev->dev);
553         if(!info)
554                 return -ENOMEM;
555
556         fbi = info->par;
557
558         platform_set_drvdata(pdev, info);
559
560         ret = imxfb_init_fbinfo(&pdev->dev);
561         if( ret < 0 )
562                 goto failed_init;
563
564         res = request_mem_region(res->start, res->end - res->start + 1, "IMXFB");
565         if (!res) {
566                 ret = -EBUSY;
567                 goto failed_regs;
568         }
569
570         if (!inf->fixed_screen_cpu) {
571                 ret = imxfb_map_video_memory(info);
572                 if (ret) {
573                         dev_err(&pdev->dev, "Failed to allocate video RAM: %d\n", ret);
574                         ret = -ENOMEM;
575                         goto failed_map;
576                 }
577         } else {
578                 /* Fixed framebuffer mapping enables location of the screen in eSRAM */
579                 fbi->map_cpu = inf->fixed_screen_cpu;
580                 fbi->map_dma = inf->fixed_screen_dma;
581                 info->screen_base = fbi->map_cpu;
582                 fbi->screen_cpu = fbi->map_cpu;
583                 fbi->screen_dma = fbi->map_dma;
584                 info->fix.smem_start = fbi->screen_dma;
585         }
586
587         /*
588          * This makes sure that our colour bitfield
589          * descriptors are correctly initialised.
590          */
591         imxfb_check_var(&info->var, info);
592
593         ret = fb_alloc_cmap(&info->cmap, 1<<info->var.bits_per_pixel, 0);
594         if (ret < 0)
595                 goto failed_cmap;
596
597         imxfb_setup_gpio(fbi);
598
599         imxfb_set_par(info);
600         ret = register_framebuffer(info);
601         if (ret < 0) {
602                 dev_err(&pdev->dev, "failed to register framebuffer\n");
603                 goto failed_register;
604         }
605
606         imxfb_enable_controller(fbi);
607
608         return 0;
609
610 failed_register:
611         fb_dealloc_cmap(&info->cmap);
612 failed_cmap:
613         if (!inf->fixed_screen_cpu)
614                 dma_free_writecombine(&pdev->dev,fbi->map_size,fbi->map_cpu,
615                            fbi->map_dma);
616 failed_map:
617         kfree(info->pseudo_palette);
618 failed_regs:
619         release_mem_region(res->start, res->end - res->start);
620 failed_init:
621         platform_set_drvdata(pdev, NULL);
622         framebuffer_release(info);
623         return ret;
624 }
625
626 static int imxfb_remove(struct platform_device *pdev)
627 {
628         struct fb_info *info = platform_get_drvdata(pdev);
629         struct imxfb_info *fbi = info->par;
630         struct resource *res;
631
632         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
633
634         imxfb_disable_controller(fbi);
635
636         unregister_framebuffer(info);
637
638         fb_dealloc_cmap(&info->cmap);
639         kfree(info->pseudo_palette);
640         framebuffer_release(info);
641
642         release_mem_region(res->start, res->end - res->start + 1);
643         platform_set_drvdata(pdev, NULL);
644
645         return 0;
646 }
647
648 void  imxfb_shutdown(struct platform_device * dev)
649 {
650         struct fb_info *info = platform_get_drvdata(dev);
651         struct imxfb_info *fbi = info->par;
652         imxfb_disable_controller(fbi);
653 }
654
655 static struct platform_driver imxfb_driver = {
656         .probe          = imxfb_probe,
657         .suspend        = imxfb_suspend,
658         .resume         = imxfb_resume,
659         .remove         = imxfb_remove,
660         .shutdown       = imxfb_shutdown,
661         .driver         = {
662                 .name   = "imx-fb",
663         },
664 };
665
666 int __init imxfb_init(void)
667 {
668         return platform_driver_register(&imxfb_driver);
669 }
670
671 static void __exit imxfb_cleanup(void)
672 {
673         platform_driver_unregister(&imxfb_driver);
674 }
675
676 module_init(imxfb_init);
677 module_exit(imxfb_cleanup);
678
679 MODULE_DESCRIPTION("Motorola i.MX framebuffer driver");
680 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
681 MODULE_LICENSE("GPL");