tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Framebuffer driver for EFI/UEFI based system
3 *
4 * (c) 2006 Edgar Hucek <gimli@dark-green.com>
5 * Original efi driver written by Gerd Knorr <kraxel@goldbach.in-berlin.de>
6 *
7 */
8
9#include <linux/module.h>
10#include <linux/kernel.h>
11#include <linux/errno.h>
12#include <linux/fb.h>
13#include <linux/platform_device.h>
14#include <linux/screen_info.h>
15#include <linux/dmi.h>
16#include <linux/pci.h>
17#include <video/vga.h>
18
19static struct fb_var_screeninfo efifb_defined __devinitdata = {
20 .activate = FB_ACTIVATE_NOW,
21 .height = -1,
22 .width = -1,
23 .right_margin = 32,
24 .upper_margin = 16,
25 .lower_margin = 4,
26 .vsync_len = 4,
27 .vmode = FB_VMODE_NONINTERLACED,
28};
29
30static struct fb_fix_screeninfo efifb_fix __devinitdata = {
31 .id = "EFI VGA",
32 .type = FB_TYPE_PACKED_PIXELS,
33 .accel = FB_ACCEL_NONE,
34 .visual = FB_VISUAL_TRUECOLOR,
35};
36
37enum {
38 M_I17, /* 17-Inch iMac */
39 M_I20, /* 20-Inch iMac */
40 M_I20_SR, /* 20-Inch iMac (Santa Rosa) */
41 M_I24, /* 24-Inch iMac */
42 M_I24_8_1, /* 24-Inch iMac, 8,1th gen */
43 M_I24_10_1, /* 24-Inch iMac, 10,1th gen */
44 M_I27_11_1, /* 27-Inch iMac, 11,1th gen */
45 M_MINI, /* Mac Mini */
46 M_MINI_3_1, /* Mac Mini, 3,1th gen */
47 M_MINI_4_1, /* Mac Mini, 4,1th gen */
48 M_MB, /* MacBook */
49 M_MB_2, /* MacBook, 2nd rev. */
50 M_MB_3, /* MacBook, 3rd rev. */
51 M_MB_5_1, /* MacBook, 5th rev. */
52 M_MB_6_1, /* MacBook, 6th rev. */
53 M_MB_7_1, /* MacBook, 7th rev. */
54 M_MB_SR, /* MacBook, 2nd gen, (Santa Rosa) */
55 M_MBA, /* MacBook Air */
56 M_MBA_3, /* Macbook Air, 3rd rev */
57 M_MBP, /* MacBook Pro */
58 M_MBP_2, /* MacBook Pro 2nd gen */
59 M_MBP_2_2, /* MacBook Pro 2,2nd gen */
60 M_MBP_SR, /* MacBook Pro (Santa Rosa) */
61 M_MBP_4, /* MacBook Pro, 4th gen */
62 M_MBP_5_1, /* MacBook Pro, 5,1th gen */
63 M_MBP_5_2, /* MacBook Pro, 5,2th gen */
64 M_MBP_5_3, /* MacBook Pro, 5,3rd gen */
65 M_MBP_6_1, /* MacBook Pro, 6,1th gen */
66 M_MBP_6_2, /* MacBook Pro, 6,2th gen */
67 M_MBP_7_1, /* MacBook Pro, 7,1th gen */
68 M_MBP_8_2, /* MacBook Pro, 8,2nd gen */
69 M_UNKNOWN /* placeholder */
70};
71
72#define OVERRIDE_NONE 0x0
73#define OVERRIDE_BASE 0x1
74#define OVERRIDE_STRIDE 0x2
75#define OVERRIDE_HEIGHT 0x4
76#define OVERRIDE_WIDTH 0x8
77
78static struct efifb_dmi_info {
79 char *optname;
80 unsigned long base;
81 int stride;
82 int width;
83 int height;
84 int flags;
85} dmi_list[] __initdata = {
86 [M_I17] = { "i17", 0x80010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
87 [M_I20] = { "i20", 0x80010000, 1728 * 4, 1680, 1050, OVERRIDE_NONE }, /* guess */
88 [M_I20_SR] = { "imac7", 0x40010000, 1728 * 4, 1680, 1050, OVERRIDE_NONE },
89 [M_I24] = { "i24", 0x80010000, 2048 * 4, 1920, 1200, OVERRIDE_NONE }, /* guess */
90 [M_I24_8_1] = { "imac8", 0xc0060000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
91 [M_I24_10_1] = { "imac10", 0xc0010000, 2048 * 4, 1920, 1080, OVERRIDE_NONE },
92 [M_I27_11_1] = { "imac11", 0xc0010000, 2560 * 4, 2560, 1440, OVERRIDE_NONE },
93 [M_MINI]= { "mini", 0x80000000, 2048 * 4, 1024, 768, OVERRIDE_NONE },
94 [M_MINI_3_1] = { "mini31", 0x40010000, 1024 * 4, 1024, 768, OVERRIDE_NONE },
95 [M_MINI_4_1] = { "mini41", 0xc0010000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
96 [M_MB] = { "macbook", 0x80000000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
97 [M_MB_5_1] = { "macbook51", 0x80010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
98 [M_MB_6_1] = { "macbook61", 0x80010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
99 [M_MB_7_1] = { "macbook71", 0x80010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
100 [M_MBA] = { "mba", 0x80000000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
101 /* 11" Macbook Air 3,1 passes the wrong stride */
102 [M_MBA_3] = { "mba3", 0, 2048 * 4, 0, 0, OVERRIDE_STRIDE },
103 [M_MBP] = { "mbp", 0x80010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
104 [M_MBP_2] = { "mbp2", 0, 0, 0, 0, OVERRIDE_NONE }, /* placeholder */
105 [M_MBP_2_2] = { "mbp22", 0x80010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
106 [M_MBP_SR] = { "mbp3", 0x80030000, 2048 * 4, 1440, 900, OVERRIDE_NONE },
107 [M_MBP_4] = { "mbp4", 0xc0060000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
108 [M_MBP_5_1] = { "mbp51", 0xc0010000, 2048 * 4, 1440, 900, OVERRIDE_NONE },
109 [M_MBP_5_2] = { "mbp52", 0xc0010000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
110 [M_MBP_5_3] = { "mbp53", 0xd0010000, 2048 * 4, 1440, 900, OVERRIDE_NONE },
111 [M_MBP_6_1] = { "mbp61", 0x90030000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
112 [M_MBP_6_2] = { "mbp62", 0x90030000, 2048 * 4, 1680, 1050, OVERRIDE_NONE },
113 [M_MBP_7_1] = { "mbp71", 0xc0010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
114 [M_MBP_8_2] = { "mbp82", 0x90010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
115 [M_UNKNOWN] = { NULL, 0, 0, 0, 0, OVERRIDE_NONE }
116};
117
118static int set_system(const struct dmi_system_id *id);
119
120#define EFIFB_DMI_SYSTEM_ID(vendor, name, enumid) \
121 { set_system, name, { \
122 DMI_MATCH(DMI_BIOS_VENDOR, vendor), \
123 DMI_MATCH(DMI_PRODUCT_NAME, name) }, \
124 &dmi_list[enumid] }
125
126static const struct dmi_system_id dmi_system_table[] __initconst = {
127 EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac4,1", M_I17),
128 /* At least one of these two will be right; maybe both? */
129 EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac5,1", M_I20),
130 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac5,1", M_I20),
131 /* At least one of these two will be right; maybe both? */
132 EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac6,1", M_I24),
133 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac6,1", M_I24),
134 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac7,1", M_I20_SR),
135 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac8,1", M_I24_8_1),
136 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac10,1", M_I24_10_1),
137 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac11,1", M_I27_11_1),
138 EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "Macmini1,1", M_MINI),
139 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "Macmini3,1", M_MINI_3_1),
140 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "Macmini4,1", M_MINI_4_1),
141 EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook1,1", M_MB),
142 /* At least one of these two will be right; maybe both? */
143 EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook2,1", M_MB),
144 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook2,1", M_MB),
145 /* At least one of these two will be right; maybe both? */
146 EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook3,1", M_MB),
147 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook3,1", M_MB),
148 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook4,1", M_MB),
149 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook5,1", M_MB_5_1),
150 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook6,1", M_MB_6_1),
151 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook7,1", M_MB_7_1),
152 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookAir1,1", M_MBA),
153 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookAir3,1", M_MBA_3),
154 EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro1,1", M_MBP),
155 EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro2,1", M_MBP_2),
156 EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro2,2", M_MBP_2_2),
157 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro2,1", M_MBP_2),
158 EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro3,1", M_MBP_SR),
159 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro3,1", M_MBP_SR),
160 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro4,1", M_MBP_4),
161 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro5,1", M_MBP_5_1),
162 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro5,2", M_MBP_5_2),
163 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro5,3", M_MBP_5_3),
164 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro6,1", M_MBP_6_1),
165 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro6,2", M_MBP_6_2),
166 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro7,1", M_MBP_7_1),
167 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro8,2", M_MBP_8_2),
168 {},
169};
170
171#define choose_value(dmivalue, fwvalue, field, flags) ({ \
172 typeof(fwvalue) _ret_ = fwvalue; \
173 if ((flags) & (field)) \
174 _ret_ = dmivalue; \
175 else if ((fwvalue) == 0) \
176 _ret_ = dmivalue; \
177 _ret_; \
178 })
179
180static int set_system(const struct dmi_system_id *id)
181{
182 struct efifb_dmi_info *info = id->driver_data;
183
184 if (info->base == 0 && info->height == 0 && info->width == 0
185 && info->stride == 0)
186 return 0;
187
188 /* Trust the bootloader over the DMI tables */
189 if (screen_info.lfb_base == 0) {
190#if defined(CONFIG_PCI)
191 struct pci_dev *dev = NULL;
192 int found_bar = 0;
193#endif
194 if (info->base) {
195 screen_info.lfb_base = choose_value(info->base,
196 screen_info.lfb_base, OVERRIDE_BASE,
197 info->flags);
198
199#if defined(CONFIG_PCI)
200 /* make sure that the address in the table is actually
201 * on a VGA device's PCI BAR */
202
203 for_each_pci_dev(dev) {
204 int i;
205 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
206 continue;
207 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
208 resource_size_t start, end;
209
210 start = pci_resource_start(dev, i);
211 if (start == 0)
212 break;
213 end = pci_resource_end(dev, i);
214 if (screen_info.lfb_base >= start &&
215 screen_info.lfb_base < end) {
216 found_bar = 1;
217 }
218 }
219 }
220 if (!found_bar)
221 screen_info.lfb_base = 0;
222#endif
223 }
224 }
225 if (screen_info.lfb_base) {
226 screen_info.lfb_linelength = choose_value(info->stride,
227 screen_info.lfb_linelength, OVERRIDE_STRIDE,
228 info->flags);
229 screen_info.lfb_width = choose_value(info->width,
230 screen_info.lfb_width, OVERRIDE_WIDTH,
231 info->flags);
232 screen_info.lfb_height = choose_value(info->height,
233 screen_info.lfb_height, OVERRIDE_HEIGHT,
234 info->flags);
235 if (screen_info.orig_video_isVGA == 0)
236 screen_info.orig_video_isVGA = VIDEO_TYPE_EFI;
237 } else {
238 screen_info.lfb_linelength = 0;
239 screen_info.lfb_width = 0;
240 screen_info.lfb_height = 0;
241 screen_info.orig_video_isVGA = 0;
242 return 0;
243 }
244
245 printk(KERN_INFO "efifb: dmi detected %s - framebuffer at %p "
246 "(%dx%d, stride %d)\n", id->ident,
247 (void *)screen_info.lfb_base, screen_info.lfb_width,
248 screen_info.lfb_height, screen_info.lfb_linelength);
249
250
251 return 1;
252}
253
254static int efifb_setcolreg(unsigned regno, unsigned red, unsigned green,
255 unsigned blue, unsigned transp,
256 struct fb_info *info)
257{
258 /*
259 * Set a single color register. The values supplied are
260 * already rounded down to the hardware's capabilities
261 * (according to the entries in the `var' structure). Return
262 * != 0 for invalid regno.
263 */
264
265 if (regno >= info->cmap.len)
266 return 1;
267
268 if (regno < 16) {
269 red >>= 8;
270 green >>= 8;
271 blue >>= 8;
272 ((u32 *)(info->pseudo_palette))[regno] =
273 (red << info->var.red.offset) |
274 (green << info->var.green.offset) |
275 (blue << info->var.blue.offset);
276 }
277 return 0;
278}
279
280static void efifb_destroy(struct fb_info *info)
281{
282 if (info->screen_base)
283 iounmap(info->screen_base);
284 release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size);
285 framebuffer_release(info);
286}
287
288static struct fb_ops efifb_ops = {
289 .owner = THIS_MODULE,
290 .fb_destroy = efifb_destroy,
291 .fb_setcolreg = efifb_setcolreg,
292 .fb_fillrect = cfb_fillrect,
293 .fb_copyarea = cfb_copyarea,
294 .fb_imageblit = cfb_imageblit,
295};
296
297static int __init efifb_setup(char *options)
298{
299 char *this_opt;
300 int i;
301
302 if (!options || !*options)
303 return 0;
304
305 while ((this_opt = strsep(&options, ",")) != NULL) {
306 if (!*this_opt) continue;
307
308 for (i = 0; i < M_UNKNOWN; i++) {
309 if (!strcmp(this_opt, dmi_list[i].optname) &&
310 dmi_list[i].base != 0) {
311 screen_info.lfb_base = dmi_list[i].base;
312 screen_info.lfb_linelength = dmi_list[i].stride;
313 screen_info.lfb_width = dmi_list[i].width;
314 screen_info.lfb_height = dmi_list[i].height;
315 }
316 }
317 if (!strncmp(this_opt, "base:", 5))
318 screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
319 else if (!strncmp(this_opt, "stride:", 7))
320 screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
321 else if (!strncmp(this_opt, "height:", 7))
322 screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
323 else if (!strncmp(this_opt, "width:", 6))
324 screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
325 }
326 return 0;
327}
328
329static int __devinit efifb_probe(struct platform_device *dev)
330{
331 struct fb_info *info;
332 int err;
333 unsigned int size_vmode;
334 unsigned int size_remap;
335 unsigned int size_total;
336 int request_succeeded = 0;
337
338 if (!screen_info.lfb_depth)
339 screen_info.lfb_depth = 32;
340 if (!screen_info.pages)
341 screen_info.pages = 1;
342 if (!screen_info.lfb_base) {
343 printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
344 return -ENODEV;
345 }
346 printk(KERN_INFO "efifb: probing for efifb\n");
347
348 /* just assume they're all unset if any are */
349 if (!screen_info.blue_size) {
350 screen_info.blue_size = 8;
351 screen_info.blue_pos = 0;
352 screen_info.green_size = 8;
353 screen_info.green_pos = 8;
354 screen_info.red_size = 8;
355 screen_info.red_pos = 16;
356 screen_info.rsvd_size = 8;
357 screen_info.rsvd_pos = 24;
358 }
359
360 efifb_fix.smem_start = screen_info.lfb_base;
361 efifb_defined.bits_per_pixel = screen_info.lfb_depth;
362 efifb_defined.xres = screen_info.lfb_width;
363 efifb_defined.yres = screen_info.lfb_height;
364 efifb_fix.line_length = screen_info.lfb_linelength;
365
366 /* size_vmode -- that is the amount of memory needed for the
367 * used video mode, i.e. the minimum amount of
368 * memory we need. */
369 size_vmode = efifb_defined.yres * efifb_fix.line_length;
370
371 /* size_total -- all video memory we have. Used for
372 * entries, ressource allocation and bounds
373 * checking. */
374 size_total = screen_info.lfb_size;
375 if (size_total < size_vmode)
376 size_total = size_vmode;
377
378 /* size_remap -- the amount of video memory we are going to
379 * use for efifb. With modern cards it is no
380 * option to simply use size_total as that
381 * wastes plenty of kernel address space. */
382 size_remap = size_vmode * 2;
383 if (size_remap > size_total)
384 size_remap = size_total;
385 if (size_remap % PAGE_SIZE)
386 size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
387 efifb_fix.smem_len = size_remap;
388
389 if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
390 request_succeeded = 1;
391 } else {
392 /* We cannot make this fatal. Sometimes this comes from magic
393 spaces our resource handlers simply don't know about */
394 printk(KERN_WARNING
395 "efifb: cannot reserve video memory at 0x%lx\n",
396 efifb_fix.smem_start);
397 }
398
399 info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
400 if (!info) {
401 printk(KERN_ERR "efifb: cannot allocate framebuffer\n");
402 err = -ENOMEM;
403 goto err_release_mem;
404 }
405 info->pseudo_palette = info->par;
406 info->par = NULL;
407
408 info->apertures = alloc_apertures(1);
409 if (!info->apertures) {
410 err = -ENOMEM;
411 goto err_release_fb;
412 }
413 info->apertures->ranges[0].base = efifb_fix.smem_start;
414 info->apertures->ranges[0].size = size_remap;
415
416 info->screen_base = ioremap(efifb_fix.smem_start, efifb_fix.smem_len);
417 if (!info->screen_base) {
418 printk(KERN_ERR "efifb: abort, cannot ioremap video memory "
419 "0x%x @ 0x%lx\n",
420 efifb_fix.smem_len, efifb_fix.smem_start);
421 err = -EIO;
422 goto err_release_fb;
423 }
424
425 printk(KERN_INFO "efifb: framebuffer at 0x%lx, mapped to 0x%p, "
426 "using %dk, total %dk\n",
427 efifb_fix.smem_start, info->screen_base,
428 size_remap/1024, size_total/1024);
429 printk(KERN_INFO "efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
430 efifb_defined.xres, efifb_defined.yres,
431 efifb_defined.bits_per_pixel, efifb_fix.line_length,
432 screen_info.pages);
433
434 efifb_defined.xres_virtual = efifb_defined.xres;
435 efifb_defined.yres_virtual = efifb_fix.smem_len /
436 efifb_fix.line_length;
437 printk(KERN_INFO "efifb: scrolling: redraw\n");
438 efifb_defined.yres_virtual = efifb_defined.yres;
439
440 /* some dummy values for timing to make fbset happy */
441 efifb_defined.pixclock = 10000000 / efifb_defined.xres *
442 1000 / efifb_defined.yres;
443 efifb_defined.left_margin = (efifb_defined.xres / 8) & 0xf8;
444 efifb_defined.hsync_len = (efifb_defined.xres / 8) & 0xf8;
445
446 efifb_defined.red.offset = screen_info.red_pos;
447 efifb_defined.red.length = screen_info.red_size;
448 efifb_defined.green.offset = screen_info.green_pos;
449 efifb_defined.green.length = screen_info.green_size;
450 efifb_defined.blue.offset = screen_info.blue_pos;
451 efifb_defined.blue.length = screen_info.blue_size;
452 efifb_defined.transp.offset = screen_info.rsvd_pos;
453 efifb_defined.transp.length = screen_info.rsvd_size;
454
455 printk(KERN_INFO "efifb: %s: "
456 "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
457 "Truecolor",
458 screen_info.rsvd_size,
459 screen_info.red_size,
460 screen_info.green_size,
461 screen_info.blue_size,
462 screen_info.rsvd_pos,
463 screen_info.red_pos,
464 screen_info.green_pos,
465 screen_info.blue_pos);
466
467 efifb_fix.ypanstep = 0;
468 efifb_fix.ywrapstep = 0;
469
470 info->fbops = &efifb_ops;
471 info->var = efifb_defined;
472 info->fix = efifb_fix;
473 info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE;
474
475 if ((err = fb_alloc_cmap(&info->cmap, 256, 0)) < 0) {
476 printk(KERN_ERR "efifb: cannot allocate colormap\n");
477 goto err_unmap;
478 }
479 if ((err = register_framebuffer(info)) < 0) {
480 printk(KERN_ERR "efifb: cannot register framebuffer\n");
481 goto err_fb_dealoc;
482 }
483 printk(KERN_INFO "fb%d: %s frame buffer device\n",
484 info->node, info->fix.id);
485 return 0;
486
487err_fb_dealoc:
488 fb_dealloc_cmap(&info->cmap);
489err_unmap:
490 iounmap(info->screen_base);
491err_release_fb:
492 framebuffer_release(info);
493err_release_mem:
494 if (request_succeeded)
495 release_mem_region(efifb_fix.smem_start, size_total);
496 return err;
497}
498
499static struct platform_driver efifb_driver = {
500 .probe = efifb_probe,
501 .driver = {
502 .name = "efifb",
503 },
504};
505
506static struct platform_device efifb_device = {
507 .name = "efifb",
508};
509
510static int __init efifb_init(void)
511{
512 int ret;
513 char *option = NULL;
514
515 dmi_check_system(dmi_system_table);
516
517 if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
518 return -ENODEV;
519
520 if (fb_get_options("efifb", &option))
521 return -ENODEV;
522 efifb_setup(option);
523
524 /* We don't get linelength from UGA Draw Protocol, only from
525 * EFI Graphics Protocol. So if it's not in DMI, and it's not
526 * passed in from the user, we really can't use the framebuffer.
527 */
528 if (!screen_info.lfb_linelength)
529 return -ENODEV;
530
531 ret = platform_driver_register(&efifb_driver);
532
533 if (!ret) {
534 ret = platform_device_register(&efifb_device);
535 if (ret)
536 platform_driver_unregister(&efifb_driver);
537 }
538 return ret;
539}
540module_init(efifb_init);
541
542MODULE_LICENSE("GPL");