1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * linux/drivers/video/mmp/fb/mmpfb.c 4 * Framebuffer driver for Marvell Display controller. 5 * 6 * Copyright (C) 2012 Marvell Technology Group Ltd. 7 * Authors: Zhou Zhu <zzhu3@marvell.com> 8 */ 9 #include <linux/module.h> 10 #include <linux/dma-mapping.h> 11 #include <linux/platform_device.h> 12 #include "mmpfb.h" 13 14 static int var_to_pixfmt(struct fb_var_screeninfo *var) 15 { 16 /* 17 * Pseudocolor mode? 18 */ 19 if (var->bits_per_pixel == 8) 20 return PIXFMT_PSEUDOCOLOR; 21 22 /* 23 * Check for YUV422PLANAR. 24 */ 25 if (var->bits_per_pixel == 16 && var->red.length == 8 && 26 var->green.length == 4 && var->blue.length == 4) { 27 if (var->green.offset >= var->blue.offset) 28 return PIXFMT_YUV422P; 29 else 30 return PIXFMT_YVU422P; 31 } 32 33 /* 34 * Check for YUV420PLANAR. 35 */ 36 if (var->bits_per_pixel == 12 && var->red.length == 8 && 37 var->green.length == 2 && var->blue.length == 2) { 38 if (var->green.offset >= var->blue.offset) 39 return PIXFMT_YUV420P; 40 else 41 return PIXFMT_YVU420P; 42 } 43 44 /* 45 * Check for YUV422PACK. 46 */ 47 if (var->bits_per_pixel == 16 && var->red.length == 16 && 48 var->green.length == 16 && var->blue.length == 16) { 49 if (var->red.offset == 0) 50 return PIXFMT_YUYV; 51 else if (var->green.offset >= var->blue.offset) 52 return PIXFMT_UYVY; 53 else 54 return PIXFMT_VYUY; 55 } 56 57 /* 58 * Check for 565/1555. 59 */ 60 if (var->bits_per_pixel == 16 && var->red.length <= 5 && 61 var->green.length <= 6 && var->blue.length <= 5) { 62 if (var->transp.length == 0) { 63 if (var->red.offset >= var->blue.offset) 64 return PIXFMT_RGB565; 65 else 66 return PIXFMT_BGR565; 67 } 68 } 69 70 /* 71 * Check for 888/A888. 72 */ 73 if (var->bits_per_pixel <= 32 && var->red.length <= 8 && 74 var->green.length <= 8 && var->blue.length <= 8) { 75 if (var->bits_per_pixel == 24 && var->transp.length == 0) { 76 if (var->red.offset >= var->blue.offset) 77 return PIXFMT_RGB888PACK; 78 else 79 return PIXFMT_BGR888PACK; 80 } 81 82 if (var->bits_per_pixel == 32 && var->transp.offset == 24) { 83 if (var->red.offset >= var->blue.offset) 84 return PIXFMT_RGBA888; 85 else 86 return PIXFMT_BGRA888; 87 } else { 88 if (var->red.offset >= var->blue.offset) 89 return PIXFMT_RGB888UNPACK; 90 else 91 return PIXFMT_BGR888UNPACK; 92 } 93 } 94 95 return -EINVAL; 96 } 97 98 static void pixfmt_to_var(struct fb_var_screeninfo *var, int pix_fmt) 99 { 100 switch (pix_fmt) { 101 case PIXFMT_RGB565: 102 var->bits_per_pixel = 16; 103 var->red.offset = 11; var->red.length = 5; 104 var->green.offset = 5; var->green.length = 6; 105 var->blue.offset = 0; var->blue.length = 5; 106 var->transp.offset = 0; var->transp.length = 0; 107 break; 108 case PIXFMT_BGR565: 109 var->bits_per_pixel = 16; 110 var->red.offset = 0; var->red.length = 5; 111 var->green.offset = 5; var->green.length = 6; 112 var->blue.offset = 11; var->blue.length = 5; 113 var->transp.offset = 0; var->transp.length = 0; 114 break; 115 case PIXFMT_RGB888UNPACK: 116 var->bits_per_pixel = 32; 117 var->red.offset = 16; var->red.length = 8; 118 var->green.offset = 8; var->green.length = 8; 119 var->blue.offset = 0; var->blue.length = 8; 120 var->transp.offset = 0; var->transp.length = 0; 121 break; 122 case PIXFMT_BGR888UNPACK: 123 var->bits_per_pixel = 32; 124 var->red.offset = 0; var->red.length = 8; 125 var->green.offset = 8; var->green.length = 8; 126 var->blue.offset = 16; var->blue.length = 8; 127 var->transp.offset = 0; var->transp.length = 0; 128 break; 129 case PIXFMT_RGBA888: 130 var->bits_per_pixel = 32; 131 var->red.offset = 16; var->red.length = 8; 132 var->green.offset = 8; var->green.length = 8; 133 var->blue.offset = 0; var->blue.length = 8; 134 var->transp.offset = 24; var->transp.length = 8; 135 break; 136 case PIXFMT_BGRA888: 137 var->bits_per_pixel = 32; 138 var->red.offset = 0; var->red.length = 8; 139 var->green.offset = 8; var->green.length = 8; 140 var->blue.offset = 16; var->blue.length = 8; 141 var->transp.offset = 24; var->transp.length = 8; 142 break; 143 case PIXFMT_RGB888PACK: 144 var->bits_per_pixel = 24; 145 var->red.offset = 16; var->red.length = 8; 146 var->green.offset = 8; var->green.length = 8; 147 var->blue.offset = 0; var->blue.length = 8; 148 var->transp.offset = 0; var->transp.length = 0; 149 break; 150 case PIXFMT_BGR888PACK: 151 var->bits_per_pixel = 24; 152 var->red.offset = 0; var->red.length = 8; 153 var->green.offset = 8; var->green.length = 8; 154 var->blue.offset = 16; var->blue.length = 8; 155 var->transp.offset = 0; var->transp.length = 0; 156 break; 157 case PIXFMT_YUV420P: 158 var->bits_per_pixel = 12; 159 var->red.offset = 4; var->red.length = 8; 160 var->green.offset = 2; var->green.length = 2; 161 var->blue.offset = 0; var->blue.length = 2; 162 var->transp.offset = 0; var->transp.length = 0; 163 break; 164 case PIXFMT_YVU420P: 165 var->bits_per_pixel = 12; 166 var->red.offset = 4; var->red.length = 8; 167 var->green.offset = 0; var->green.length = 2; 168 var->blue.offset = 2; var->blue.length = 2; 169 var->transp.offset = 0; var->transp.length = 0; 170 break; 171 case PIXFMT_YUV422P: 172 var->bits_per_pixel = 16; 173 var->red.offset = 8; var->red.length = 8; 174 var->green.offset = 4; var->green.length = 4; 175 var->blue.offset = 0; var->blue.length = 4; 176 var->transp.offset = 0; var->transp.length = 0; 177 break; 178 case PIXFMT_YVU422P: 179 var->bits_per_pixel = 16; 180 var->red.offset = 8; var->red.length = 8; 181 var->green.offset = 0; var->green.length = 4; 182 var->blue.offset = 4; var->blue.length = 4; 183 var->transp.offset = 0; var->transp.length = 0; 184 break; 185 case PIXFMT_UYVY: 186 var->bits_per_pixel = 16; 187 var->red.offset = 8; var->red.length = 16; 188 var->green.offset = 4; var->green.length = 16; 189 var->blue.offset = 0; var->blue.length = 16; 190 var->transp.offset = 0; var->transp.length = 0; 191 break; 192 case PIXFMT_VYUY: 193 var->bits_per_pixel = 16; 194 var->red.offset = 8; var->red.length = 16; 195 var->green.offset = 0; var->green.length = 16; 196 var->blue.offset = 4; var->blue.length = 16; 197 var->transp.offset = 0; var->transp.length = 0; 198 break; 199 case PIXFMT_YUYV: 200 var->bits_per_pixel = 16; 201 var->red.offset = 0; var->red.length = 16; 202 var->green.offset = 4; var->green.length = 16; 203 var->blue.offset = 8; var->blue.length = 16; 204 var->transp.offset = 0; var->transp.length = 0; 205 break; 206 case PIXFMT_PSEUDOCOLOR: 207 var->bits_per_pixel = 8; 208 var->red.offset = 0; var->red.length = 8; 209 var->green.offset = 0; var->green.length = 8; 210 var->blue.offset = 0; var->blue.length = 8; 211 var->transp.offset = 0; var->transp.length = 0; 212 break; 213 } 214 } 215 216 /* 217 * fb framework has its limitation: 218 * 1. input color/output color is not seprated 219 * 2. fb_videomode not include output color 220 * so for fb usage, we keep a output format which is not changed 221 * then it's added for mmpmode 222 */ 223 static void fbmode_to_mmpmode(struct mmp_mode *mode, 224 struct fb_videomode *videomode, int output_fmt) 225 { 226 u64 div_result = 1000000000000ll; 227 mode->name = videomode->name; 228 mode->refresh = videomode->refresh; 229 mode->xres = videomode->xres; 230 mode->yres = videomode->yres; 231 232 do_div(div_result, videomode->pixclock); 233 mode->pixclock_freq = (u32)div_result; 234 235 mode->left_margin = videomode->left_margin; 236 mode->right_margin = videomode->right_margin; 237 mode->upper_margin = videomode->upper_margin; 238 mode->lower_margin = videomode->lower_margin; 239 mode->hsync_len = videomode->hsync_len; 240 mode->vsync_len = videomode->vsync_len; 241 mode->hsync_invert = !!(videomode->sync & FB_SYNC_HOR_HIGH_ACT); 242 mode->vsync_invert = !!(videomode->sync & FB_SYNC_VERT_HIGH_ACT); 243 /* no defined flag in fb, use vmode>>3*/ 244 mode->invert_pixclock = !!(videomode->vmode & 8); 245 mode->pix_fmt_out = output_fmt; 246 } 247 248 static void mmpmode_to_fbmode(struct fb_videomode *videomode, 249 struct mmp_mode *mode) 250 { 251 u64 div_result = 1000000000000ll; 252 253 videomode->name = mode->name; 254 videomode->refresh = mode->refresh; 255 videomode->xres = mode->xres; 256 videomode->yres = mode->yres; 257 258 do_div(div_result, mode->pixclock_freq); 259 videomode->pixclock = (u32)div_result; 260 261 videomode->left_margin = mode->left_margin; 262 videomode->right_margin = mode->right_margin; 263 videomode->upper_margin = mode->upper_margin; 264 videomode->lower_margin = mode->lower_margin; 265 videomode->hsync_len = mode->hsync_len; 266 videomode->vsync_len = mode->vsync_len; 267 videomode->sync = (mode->hsync_invert ? FB_SYNC_HOR_HIGH_ACT : 0) 268 | (mode->vsync_invert ? FB_SYNC_VERT_HIGH_ACT : 0); 269 videomode->vmode = mode->invert_pixclock ? 8 : 0; 270 } 271 272 static int mmpfb_check_var(struct fb_var_screeninfo *var, 273 struct fb_info *info) 274 { 275 struct mmpfb_info *fbi = info->par; 276 277 if (var->bits_per_pixel == 8) 278 return -EINVAL; 279 /* 280 * Basic geometry sanity checks. 281 */ 282 if (var->xoffset + var->xres > var->xres_virtual) 283 return -EINVAL; 284 if (var->yoffset + var->yres > var->yres_virtual) 285 return -EINVAL; 286 287 /* 288 * Check size of framebuffer. 289 */ 290 if (var->xres_virtual * var->yres_virtual * 291 (var->bits_per_pixel >> 3) > fbi->fb_size) 292 return -EINVAL; 293 294 return 0; 295 } 296 297 static unsigned int chan_to_field(unsigned int chan, struct fb_bitfield *bf) 298 { 299 return ((chan & 0xffff) >> (16 - bf->length)) << bf->offset; 300 } 301 302 static u32 to_rgb(u16 red, u16 green, u16 blue) 303 { 304 red >>= 8; 305 green >>= 8; 306 blue >>= 8; 307 308 return (red << 16) | (green << 8) | blue; 309 } 310 311 static int mmpfb_setcolreg(unsigned int regno, unsigned int red, 312 unsigned int green, unsigned int blue, 313 unsigned int trans, struct fb_info *info) 314 { 315 struct mmpfb_info *fbi = info->par; 316 u32 val; 317 318 if (info->fix.visual == FB_VISUAL_TRUECOLOR && regno < 16) { 319 val = chan_to_field(red, &info->var.red); 320 val |= chan_to_field(green, &info->var.green); 321 val |= chan_to_field(blue , &info->var.blue); 322 fbi->pseudo_palette[regno] = val; 323 } 324 325 if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR && regno < 256) { 326 val = to_rgb(red, green, blue); 327 /* TODO */ 328 } 329 330 return 0; 331 } 332 333 static int mmpfb_pan_display(struct fb_var_screeninfo *var, 334 struct fb_info *info) 335 { 336 struct mmpfb_info *fbi = info->par; 337 struct mmp_addr addr; 338 339 memset(&addr, 0, sizeof(addr)); 340 addr.phys[0] = (var->yoffset * var->xres_virtual + var->xoffset) 341 * var->bits_per_pixel / 8 + fbi->fb_start_dma; 342 mmp_overlay_set_addr(fbi->overlay, &addr); 343 344 return 0; 345 } 346 347 static int var_update(struct fb_info *info) 348 { 349 struct mmpfb_info *fbi = info->par; 350 struct fb_var_screeninfo *var = &info->var; 351 struct fb_videomode *m; 352 int pix_fmt; 353 354 /* set pix_fmt */ 355 pix_fmt = var_to_pixfmt(var); 356 if (pix_fmt < 0) 357 return -EINVAL; 358 pixfmt_to_var(var, pix_fmt); 359 fbi->pix_fmt = pix_fmt; 360 361 /* set var according to best video mode*/ 362 m = (struct fb_videomode *)fb_match_mode(var, &info->modelist); 363 if (!m) { 364 dev_err(fbi->dev, "set par: no match mode, use best mode\n"); 365 m = (struct fb_videomode *)fb_find_best_mode(var, 366 &info->modelist); 367 fb_videomode_to_var(var, m); 368 } 369 memcpy(&fbi->mode, m, sizeof(struct fb_videomode)); 370 371 /* fix to 2* yres */ 372 var->yres_virtual = var->yres * 2; 373 info->fix.visual = (pix_fmt == PIXFMT_PSEUDOCOLOR) ? 374 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR; 375 info->fix.line_length = var->xres_virtual * var->bits_per_pixel / 8; 376 info->fix.ypanstep = var->yres; 377 return 0; 378 } 379 380 static void mmpfb_set_win(struct fb_info *info) 381 { 382 struct mmpfb_info *fbi = info->par; 383 struct fb_var_screeninfo *var = &info->var; 384 struct mmp_win win; 385 u32 stride; 386 387 memset(&win, 0, sizeof(win)); 388 win.xsrc = win.xdst = fbi->mode.xres; 389 win.ysrc = win.ydst = fbi->mode.yres; 390 win.pix_fmt = fbi->pix_fmt; 391 stride = pixfmt_to_stride(win.pix_fmt); 392 win.pitch[0] = var->xres_virtual * stride; 393 win.pitch[1] = win.pitch[2] = 394 (stride == 1) ? (var->xres_virtual >> 1) : 0; 395 mmp_overlay_set_win(fbi->overlay, &win); 396 } 397 398 static int mmpfb_set_par(struct fb_info *info) 399 { 400 struct mmpfb_info *fbi = info->par; 401 struct fb_var_screeninfo *var = &info->var; 402 struct mmp_addr addr; 403 struct mmp_mode mode; 404 int ret; 405 406 ret = var_update(info); 407 if (ret != 0) 408 return ret; 409 410 /* set window/path according to new videomode */ 411 fbmode_to_mmpmode(&mode, &fbi->mode, fbi->output_fmt); 412 mmp_path_set_mode(fbi->path, &mode); 413 414 /* set window related info */ 415 mmpfb_set_win(info); 416 417 /* set address always */ 418 memset(&addr, 0, sizeof(addr)); 419 addr.phys[0] = (var->yoffset * var->xres_virtual + var->xoffset) 420 * var->bits_per_pixel / 8 + fbi->fb_start_dma; 421 mmp_overlay_set_addr(fbi->overlay, &addr); 422 423 return 0; 424 } 425 426 static void mmpfb_power(struct mmpfb_info *fbi, int power) 427 { 428 struct mmp_addr addr; 429 struct fb_var_screeninfo *var = &fbi->fb_info->var; 430 431 /* for power on, always set address/window again */ 432 if (power) { 433 /* set window related info */ 434 mmpfb_set_win(fbi->fb_info); 435 436 /* set address always */ 437 memset(&addr, 0, sizeof(addr)); 438 addr.phys[0] = fbi->fb_start_dma + 439 (var->yoffset * var->xres_virtual + var->xoffset) 440 * var->bits_per_pixel / 8; 441 mmp_overlay_set_addr(fbi->overlay, &addr); 442 } 443 mmp_overlay_set_onoff(fbi->overlay, power); 444 } 445 446 static int mmpfb_blank(int blank, struct fb_info *info) 447 { 448 struct mmpfb_info *fbi = info->par; 449 450 mmpfb_power(fbi, (blank == FB_BLANK_UNBLANK)); 451 452 return 0; 453 } 454 455 static const struct fb_ops mmpfb_ops = { 456 .owner = THIS_MODULE, 457 FB_DEFAULT_IOMEM_OPS, 458 .fb_blank = mmpfb_blank, 459 .fb_check_var = mmpfb_check_var, 460 .fb_set_par = mmpfb_set_par, 461 .fb_setcolreg = mmpfb_setcolreg, 462 .fb_pan_display = mmpfb_pan_display, 463 }; 464 465 static int modes_setup(struct mmpfb_info *fbi) 466 { 467 struct fb_videomode *videomodes; 468 struct mmp_mode *mmp_modes; 469 struct fb_info *info = fbi->fb_info; 470 int videomode_num, i; 471 472 /* get videomodes from path */ 473 videomode_num = mmp_path_get_modelist(fbi->path, &mmp_modes); 474 if (!videomode_num) { 475 dev_warn(fbi->dev, "can't get videomode num\n"); 476 return 0; 477 } 478 /* put videomode list to info structure */ 479 videomodes = kzalloc_objs(struct fb_videomode, videomode_num); 480 if (!videomodes) 481 return -ENOMEM; 482 483 for (i = 0; i < videomode_num; i++) 484 mmpmode_to_fbmode(&videomodes[i], &mmp_modes[i]); 485 fb_videomode_to_modelist(videomodes, videomode_num, &info->modelist); 486 487 /* set videomode[0] as default mode */ 488 memcpy(&fbi->mode, &videomodes[0], sizeof(struct fb_videomode)); 489 fbi->output_fmt = mmp_modes[0].pix_fmt_out; 490 fb_videomode_to_var(&info->var, &fbi->mode); 491 mmp_path_set_mode(fbi->path, &mmp_modes[0]); 492 493 kfree(videomodes); 494 return videomode_num; 495 } 496 497 static int fb_info_setup(struct fb_info *info, 498 struct mmpfb_info *fbi) 499 { 500 int ret = 0; 501 /* Initialise static fb parameters.*/ 502 info->flags = FBINFO_PARTIAL_PAN_OK | 503 FBINFO_HWACCEL_XPAN | FBINFO_HWACCEL_YPAN; 504 info->node = -1; 505 strcpy(info->fix.id, fbi->name); 506 info->fix.type = FB_TYPE_PACKED_PIXELS; 507 info->fix.type_aux = 0; 508 info->fix.xpanstep = 0; 509 info->fix.ypanstep = info->var.yres; 510 info->fix.ywrapstep = 0; 511 info->fix.accel = FB_ACCEL_NONE; 512 info->fix.smem_start = fbi->fb_start_dma; 513 info->fix.smem_len = fbi->fb_size; 514 info->fix.visual = (fbi->pix_fmt == PIXFMT_PSEUDOCOLOR) ? 515 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR; 516 info->fix.line_length = info->var.xres_virtual * 517 info->var.bits_per_pixel / 8; 518 info->fbops = &mmpfb_ops; 519 info->pseudo_palette = fbi->pseudo_palette; 520 info->screen_buffer = fbi->fb_start; 521 info->screen_size = fbi->fb_size; 522 523 /* For FB framework: Allocate color map and Register framebuffer*/ 524 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) 525 ret = -ENOMEM; 526 527 return ret; 528 } 529 530 static void fb_info_clear(struct fb_info *info) 531 { 532 fb_dealloc_cmap(&info->cmap); 533 } 534 535 static int mmpfb_probe(struct platform_device *pdev) 536 { 537 struct mmp_buffer_driver_mach_info *mi; 538 struct fb_info *info; 539 struct mmpfb_info *fbi; 540 int ret, modes_num; 541 542 mi = pdev->dev.platform_data; 543 if (mi == NULL) { 544 dev_err(&pdev->dev, "no platform data defined\n"); 545 return -EINVAL; 546 } 547 548 /* initialize fb */ 549 info = framebuffer_alloc(sizeof(struct mmpfb_info), &pdev->dev); 550 if (info == NULL) 551 return -ENOMEM; 552 fbi = info->par; 553 554 /* init fb */ 555 fbi->fb_info = info; 556 platform_set_drvdata(pdev, fbi); 557 fbi->dev = &pdev->dev; 558 fbi->name = mi->name; 559 fbi->pix_fmt = mi->default_pixfmt; 560 pixfmt_to_var(&info->var, fbi->pix_fmt); 561 mutex_init(&fbi->access_ok); 562 563 /* get display path by name */ 564 fbi->path = mmp_get_path(mi->path_name); 565 if (!fbi->path) { 566 dev_err(&pdev->dev, "can't get the path %s\n", mi->path_name); 567 ret = -EINVAL; 568 goto failed_destroy_mutex; 569 } 570 571 dev_info(fbi->dev, "path %s get\n", fbi->path->name); 572 573 /* get overlay */ 574 fbi->overlay = mmp_path_get_overlay(fbi->path, mi->overlay_id); 575 if (!fbi->overlay) { 576 ret = -EINVAL; 577 goto failed_destroy_mutex; 578 } 579 /* set fetch used */ 580 mmp_overlay_set_fetch(fbi->overlay, mi->dmafetch_id); 581 582 modes_num = modes_setup(fbi); 583 if (modes_num < 0) { 584 ret = modes_num; 585 goto failed_destroy_mutex; 586 } 587 588 /* 589 * if get modes success, means not hotplug panels, use caculated buffer 590 * or use default size 591 */ 592 if (modes_num > 0) { 593 /* fix to 2* yres */ 594 info->var.yres_virtual = info->var.yres * 2; 595 596 /* Allocate framebuffer memory: size = modes xy *4 */ 597 fbi->fb_size = info->var.xres_virtual * info->var.yres_virtual 598 * info->var.bits_per_pixel / 8; 599 } else { 600 fbi->fb_size = MMPFB_DEFAULT_SIZE; 601 } 602 603 fbi->fb_start = dma_alloc_coherent(&pdev->dev, PAGE_ALIGN(fbi->fb_size), 604 &fbi->fb_start_dma, GFP_KERNEL); 605 if (fbi->fb_start == NULL) { 606 dev_err(&pdev->dev, "can't alloc framebuffer\n"); 607 ret = -ENOMEM; 608 goto failed_destroy_mutex; 609 } 610 dev_info(fbi->dev, "fb %dk allocated\n", fbi->fb_size/1024); 611 612 /* fb power on */ 613 if (modes_num > 0) 614 mmpfb_power(fbi, 1); 615 616 ret = fb_info_setup(info, fbi); 617 if (ret < 0) 618 goto failed_free_buff; 619 620 ret = register_framebuffer(info); 621 if (ret < 0) { 622 dev_err(&pdev->dev, "Failed to register fb: %d\n", ret); 623 ret = -ENXIO; 624 goto failed_clear_info; 625 } 626 627 dev_info(fbi->dev, "loaded to /dev/fb%d <%s>.\n", 628 info->node, info->fix.id); 629 630 return 0; 631 632 failed_clear_info: 633 fb_info_clear(info); 634 failed_free_buff: 635 dma_free_coherent(&pdev->dev, PAGE_ALIGN(fbi->fb_size), fbi->fb_start, 636 fbi->fb_start_dma); 637 failed_destroy_mutex: 638 mutex_destroy(&fbi->access_ok); 639 dev_err(fbi->dev, "mmp-fb: frame buffer device init failed\n"); 640 641 framebuffer_release(info); 642 643 return ret; 644 } 645 646 static struct platform_driver mmpfb_driver = { 647 .driver = { 648 .name = "mmp-fb", 649 }, 650 .probe = mmpfb_probe, 651 }; 652 653 static int mmpfb_init(void) 654 { 655 return platform_driver_register(&mmpfb_driver); 656 } 657 module_init(mmpfb_init); 658 659 MODULE_AUTHOR("Zhou Zhu <zhou.zhu@marvell.com>"); 660 MODULE_DESCRIPTION("Framebuffer driver for Marvell displays"); 661 MODULE_LICENSE("GPL"); 662