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Use dentry_path() to create full path to inode object
[pohmelfs.git] / drivers / video / efifb.c
blob784139aed0793cab282cf52f3f3c3503a85a9a5a
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
19 static bool request_mem_succeeded = false;
20
21 static struct fb_var_screeninfo efifb_defined __devinitdata = {
22 .activate = FB_ACTIVATE_NOW,
23 .height = -1,
24 .width = -1,
25 .right_margin = 32,
26 .upper_margin = 16,
27 .lower_margin = 4,
28 .vsync_len = 4,
29 .vmode = FB_VMODE_NONINTERLACED,
30 };
31
32 static struct fb_fix_screeninfo efifb_fix __devinitdata = {
33 .id = "EFI VGA",
34 .type = FB_TYPE_PACKED_PIXELS,
35 .accel = FB_ACCEL_NONE,
36 .visual = FB_VISUAL_TRUECOLOR,
37 };
38
39 enum {
40 M_I17, /* 17-Inch iMac */
41 M_I20, /* 20-Inch iMac */
42 M_I20_SR, /* 20-Inch iMac (Santa Rosa) */
43 M_I24, /* 24-Inch iMac */
44 M_I24_8_1, /* 24-Inch iMac, 8,1th gen */
45 M_I24_10_1, /* 24-Inch iMac, 10,1th gen */
46 M_I27_11_1, /* 27-Inch iMac, 11,1th gen */
47 M_MINI, /* Mac Mini */
48 M_MINI_3_1, /* Mac Mini, 3,1th gen */
49 M_MINI_4_1, /* Mac Mini, 4,1th gen */
50 M_MB, /* MacBook */
51 M_MB_2, /* MacBook, 2nd rev. */
52 M_MB_3, /* MacBook, 3rd rev. */
53 M_MB_5_1, /* MacBook, 5th rev. */
54 M_MB_6_1, /* MacBook, 6th rev. */
55 M_MB_7_1, /* MacBook, 7th rev. */
56 M_MB_SR, /* MacBook, 2nd gen, (Santa Rosa) */
57 M_MBA, /* MacBook Air */
58 M_MBA_3, /* Macbook Air, 3rd rev */
59 M_MBP, /* MacBook Pro */
60 M_MBP_2, /* MacBook Pro 2nd gen */
61 M_MBP_2_2, /* MacBook Pro 2,2nd gen */
62 M_MBP_SR, /* MacBook Pro (Santa Rosa) */
63 M_MBP_4, /* MacBook Pro, 4th gen */
64 M_MBP_5_1, /* MacBook Pro, 5,1th gen */
65 M_MBP_5_2, /* MacBook Pro, 5,2th gen */
66 M_MBP_5_3, /* MacBook Pro, 5,3rd gen */
67 M_MBP_6_1, /* MacBook Pro, 6,1th gen */
68 M_MBP_6_2, /* MacBook Pro, 6,2th gen */
69 M_MBP_7_1, /* MacBook Pro, 7,1th gen */
70 M_MBP_8_2, /* MacBook Pro, 8,2nd gen */
71 M_UNKNOWN /* placeholder */
72 };
73
74 #define OVERRIDE_NONE 0x0
75 #define OVERRIDE_BASE 0x1
76 #define OVERRIDE_STRIDE 0x2
77 #define OVERRIDE_HEIGHT 0x4
78 #define OVERRIDE_WIDTH 0x8
79
80 static struct efifb_dmi_info {
81 char *optname;
82 unsigned long base;
83 int stride;
84 int width;
85 int height;
86 int flags;
87 } dmi_list[] __initdata = {
88 [M_I17] = { "i17", 0x80010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
89 [M_I20] = { "i20", 0x80010000, 1728 * 4, 1680, 1050, OVERRIDE_NONE }, /* guess */
90 [M_I20_SR] = { "imac7", 0x40010000, 1728 * 4, 1680, 1050, OVERRIDE_NONE },
91 [M_I24] = { "i24", 0x80010000, 2048 * 4, 1920, 1200, OVERRIDE_NONE }, /* guess */
92 [M_I24_8_1] = { "imac8", 0xc0060000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
93 [M_I24_10_1] = { "imac10", 0xc0010000, 2048 * 4, 1920, 1080, OVERRIDE_NONE },
94 [M_I27_11_1] = { "imac11", 0xc0010000, 2560 * 4, 2560, 1440, OVERRIDE_NONE },
95 [M_MINI]= { "mini", 0x80000000, 2048 * 4, 1024, 768, OVERRIDE_NONE },
96 [M_MINI_3_1] = { "mini31", 0x40010000, 1024 * 4, 1024, 768, OVERRIDE_NONE },
97 [M_MINI_4_1] = { "mini41", 0xc0010000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
98 [M_MB] = { "macbook", 0x80000000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
99 [M_MB_5_1] = { "macbook51", 0x80010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
100 [M_MB_6_1] = { "macbook61", 0x80010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
101 [M_MB_7_1] = { "macbook71", 0x80010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
102 [M_MBA] = { "mba", 0x80000000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
103 /* 11" Macbook Air 3,1 passes the wrong stride */
104 [M_MBA_3] = { "mba3", 0, 2048 * 4, 0, 0, OVERRIDE_STRIDE },
105 [M_MBP] = { "mbp", 0x80010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
106 [M_MBP_2] = { "mbp2", 0, 0, 0, 0, OVERRIDE_NONE }, /* placeholder */
107 [M_MBP_2_2] = { "mbp22", 0x80010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
108 [M_MBP_SR] = { "mbp3", 0x80030000, 2048 * 4, 1440, 900, OVERRIDE_NONE },
109 [M_MBP_4] = { "mbp4", 0xc0060000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
110 [M_MBP_5_1] = { "mbp51", 0xc0010000, 2048 * 4, 1440, 900, OVERRIDE_NONE },
111 [M_MBP_5_2] = { "mbp52", 0xc0010000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
112 [M_MBP_5_3] = { "mbp53", 0xd0010000, 2048 * 4, 1440, 900, OVERRIDE_NONE },
113 [M_MBP_6_1] = { "mbp61", 0x90030000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
114 [M_MBP_6_2] = { "mbp62", 0x90030000, 2048 * 4, 1680, 1050, OVERRIDE_NONE },
115 [M_MBP_7_1] = { "mbp71", 0xc0010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
116 [M_MBP_8_2] = { "mbp82", 0x90010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
117 [M_UNKNOWN] = { NULL, 0, 0, 0, 0, OVERRIDE_NONE }
118 };
119
120 static int set_system(const struct dmi_system_id *id);
121
122 #define EFIFB_DMI_SYSTEM_ID(vendor, name, enumid) \
123 { set_system, name, { \
124 DMI_MATCH(DMI_BIOS_VENDOR, vendor), \
125 DMI_MATCH(DMI_PRODUCT_NAME, name) }, \
126 &dmi_list[enumid] }
127
128 static const struct dmi_system_id dmi_system_table[] __initconst = {
129 EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac4,1", M_I17),
130 /* At least one of these two will be right; maybe both? */
131 EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac5,1", M_I20),
132 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac5,1", M_I20),
133 /* At least one of these two will be right; maybe both? */
134 EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac6,1", M_I24),
135 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac6,1", M_I24),
136 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac7,1", M_I20_SR),
137 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac8,1", M_I24_8_1),
138 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac10,1", M_I24_10_1),
139 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac11,1", M_I27_11_1),
140 EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "Macmini1,1", M_MINI),
141 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "Macmini3,1", M_MINI_3_1),
142 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "Macmini4,1", M_MINI_4_1),
143 EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook1,1", M_MB),
144 /* At least one of these two will be right; maybe both? */
145 EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook2,1", M_MB),
146 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook2,1", M_MB),
147 /* At least one of these two will be right; maybe both? */
148 EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook3,1", M_MB),
149 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook3,1", M_MB),
150 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook4,1", M_MB),
151 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook5,1", M_MB_5_1),
152 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook6,1", M_MB_6_1),
153 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook7,1", M_MB_7_1),
154 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookAir1,1", M_MBA),
155 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookAir3,1", M_MBA_3),
156 EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro1,1", M_MBP),
157 EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro2,1", M_MBP_2),
158 EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro2,2", M_MBP_2_2),
159 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro2,1", M_MBP_2),
160 EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro3,1", M_MBP_SR),
161 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro3,1", M_MBP_SR),
162 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro4,1", M_MBP_4),
163 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro5,1", M_MBP_5_1),
164 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro5,2", M_MBP_5_2),
165 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro5,3", M_MBP_5_3),
166 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro6,1", M_MBP_6_1),
167 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro6,2", M_MBP_6_2),
168 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro7,1", M_MBP_7_1),
169 EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro8,2", M_MBP_8_2),
170 {},
171 };
172
173 #define choose_value(dmivalue, fwvalue, field, flags) ({ \
174 typeof(fwvalue) _ret_ = fwvalue; \
175 if ((flags) & (field)) \
176 _ret_ = dmivalue; \
177 else if ((fwvalue) == 0) \
178 _ret_ = dmivalue; \
179 _ret_; \
180 })
181
182 static int set_system(const struct dmi_system_id *id)
183 {
184 struct efifb_dmi_info *info = id->driver_data;
185
186 if (info->base == 0 && info->height == 0 && info->width == 0
187 && info->stride == 0)
188 return 0;
189
190 /* Trust the bootloader over the DMI tables */
191 if (screen_info.lfb_base == 0) {
192 #if defined(CONFIG_PCI)
193 struct pci_dev *dev = NULL;
194 int found_bar = 0;
195 #endif
196 if (info->base) {
197 screen_info.lfb_base = choose_value(info->base,
198 screen_info.lfb_base, OVERRIDE_BASE,
199 info->flags);
200
201 #if defined(CONFIG_PCI)
202 /* make sure that the address in the table is actually
203 * on a VGA device's PCI BAR */
204
205 for_each_pci_dev(dev) {
206 int i;
207 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
208 continue;
209 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
210 resource_size_t start, end;
211
212 start = pci_resource_start(dev, i);
213 if (start == 0)
214 break;
215 end = pci_resource_end(dev, i);
216 if (screen_info.lfb_base >= start &&
217 screen_info.lfb_base < end) {
218 found_bar = 1;
219 }
220 }
221 }
222 if (!found_bar)
223 screen_info.lfb_base = 0;
224 #endif
225 }
226 }
227 if (screen_info.lfb_base) {
228 screen_info.lfb_linelength = choose_value(info->stride,
229 screen_info.lfb_linelength, OVERRIDE_STRIDE,
230 info->flags);
231 screen_info.lfb_width = choose_value(info->width,
232 screen_info.lfb_width, OVERRIDE_WIDTH,
233 info->flags);
234 screen_info.lfb_height = choose_value(info->height,
235 screen_info.lfb_height, OVERRIDE_HEIGHT,
236 info->flags);
237 if (screen_info.orig_video_isVGA == 0)
238 screen_info.orig_video_isVGA = VIDEO_TYPE_EFI;
239 } else {
240 screen_info.lfb_linelength = 0;
241 screen_info.lfb_width = 0;
242 screen_info.lfb_height = 0;
243 screen_info.orig_video_isVGA = 0;
244 return 0;
245 }
246
247 printk(KERN_INFO "efifb: dmi detected %s - framebuffer at 0x%08x "
248 "(%dx%d, stride %d)\n", id->ident,
249 screen_info.lfb_base, screen_info.lfb_width,
250 screen_info.lfb_height, screen_info.lfb_linelength);
251
252
253 return 1;
254 }
255
256 static int efifb_setcolreg(unsigned regno, unsigned red, unsigned green,
257 unsigned blue, unsigned transp,
258 struct fb_info *info)
259 {
260 /*
261 * Set a single color register. The values supplied are
262 * already rounded down to the hardware's capabilities
263 * (according to the entries in the `var' structure). Return
264 * != 0 for invalid regno.
265 */
266
267 if (regno >= info->cmap.len)
268 return 1;
269
270 if (regno < 16) {
271 red >>= 8;
272 green >>= 8;
273 blue >>= 8;
274 ((u32 *)(info->pseudo_palette))[regno] =
275 (red << info->var.red.offset) |
276 (green << info->var.green.offset) |
277 (blue << info->var.blue.offset);
278 }
279 return 0;
280 }
281
282 static void efifb_destroy(struct fb_info *info)
283 {
284 if (info->screen_base)
285 iounmap(info->screen_base);
286 if (request_mem_succeeded)
287 release_mem_region(info->apertures->ranges[0].base,
288 info->apertures->ranges[0].size);
289 framebuffer_release(info);
290 }
291
292 static struct fb_ops efifb_ops = {
293 .owner = THIS_MODULE,
294 .fb_destroy = efifb_destroy,
295 .fb_setcolreg = efifb_setcolreg,
296 .fb_fillrect = cfb_fillrect,
297 .fb_copyarea = cfb_copyarea,
298 .fb_imageblit = cfb_imageblit,
299 };
300
301 static int __init efifb_setup(char *options)
302 {
303 char *this_opt;
304 int i;
305
306 if (!options || !*options)
307 return 0;
308
309 while ((this_opt = strsep(&options, ",")) != NULL) {
310 if (!*this_opt) continue;
311
312 for (i = 0; i < M_UNKNOWN; i++) {
313 if (!strcmp(this_opt, dmi_list[i].optname) &&
314 dmi_list[i].base != 0) {
315 screen_info.lfb_base = dmi_list[i].base;
316 screen_info.lfb_linelength = dmi_list[i].stride;
317 screen_info.lfb_width = dmi_list[i].width;
318 screen_info.lfb_height = dmi_list[i].height;
319 }
320 }
321 if (!strncmp(this_opt, "base:", 5))
322 screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
323 else if (!strncmp(this_opt, "stride:", 7))
324 screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
325 else if (!strncmp(this_opt, "height:", 7))
326 screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
327 else if (!strncmp(this_opt, "width:", 6))
328 screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
329 }
330 return 0;
331 }
332
333 static int __init efifb_probe(struct platform_device *dev)
334 {
335 struct fb_info *info;
336 int err;
337 unsigned int size_vmode;
338 unsigned int size_remap;
339 unsigned int size_total;
340
341 if (!screen_info.lfb_depth)
342 screen_info.lfb_depth = 32;
343 if (!screen_info.pages)
344 screen_info.pages = 1;
345 if (!screen_info.lfb_base) {
346 printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
347 return -ENODEV;
348 }
349 printk(KERN_INFO "efifb: probing for efifb\n");
350
351 /* just assume they're all unset if any are */
352 if (!screen_info.blue_size) {
353 screen_info.blue_size = 8;
354 screen_info.blue_pos = 0;
355 screen_info.green_size = 8;
356 screen_info.green_pos = 8;
357 screen_info.red_size = 8;
358 screen_info.red_pos = 16;
359 screen_info.rsvd_size = 8;
360 screen_info.rsvd_pos = 24;
361 }
362
363 efifb_fix.smem_start = screen_info.lfb_base;
364 efifb_defined.bits_per_pixel = screen_info.lfb_depth;
365 efifb_defined.xres = screen_info.lfb_width;
366 efifb_defined.yres = screen_info.lfb_height;
367 efifb_fix.line_length = screen_info.lfb_linelength;
368
369 /* size_vmode -- that is the amount of memory needed for the
370 * used video mode, i.e. the minimum amount of
371 * memory we need. */
372 size_vmode = efifb_defined.yres * efifb_fix.line_length;
373
374 /* size_total -- all video memory we have. Used for
375 * entries, ressource allocation and bounds
376 * checking. */
377 size_total = screen_info.lfb_size;
378 if (size_total < size_vmode)
379 size_total = size_vmode;
380
381 /* size_remap -- the amount of video memory we are going to
382 * use for efifb. With modern cards it is no
383 * option to simply use size_total as that
384 * wastes plenty of kernel address space. */
385 size_remap = size_vmode * 2;
386 if (size_remap > size_total)
387 size_remap = size_total;
388 if (size_remap % PAGE_SIZE)
389 size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
390 efifb_fix.smem_len = size_remap;
391
392 if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
393 request_mem_succeeded = true;
394 } else {
395 /* We cannot make this fatal. Sometimes this comes from magic
396 spaces our resource handlers simply don't know about */
397 printk(KERN_WARNING
398 "efifb: cannot reserve video memory at 0x%lx\n",
399 efifb_fix.smem_start);
400 }
401
402 info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
403 if (!info) {
404 printk(KERN_ERR "efifb: cannot allocate framebuffer\n");
405 err = -ENOMEM;
406 goto err_release_mem;
407 }
408 info->pseudo_palette = info->par;
409 info->par = NULL;
410
411 info->apertures = alloc_apertures(1);
412 if (!info->apertures) {
413 err = -ENOMEM;
414 goto err_release_fb;
415 }
416 info->apertures->ranges[0].base = efifb_fix.smem_start;
417 info->apertures->ranges[0].size = size_remap;
418
419 info->screen_base = ioremap_wc(efifb_fix.smem_start, efifb_fix.smem_len);
420 if (!info->screen_base) {
421 printk(KERN_ERR "efifb: abort, cannot ioremap video memory "
422 "0x%x @ 0x%lx\n",
423 efifb_fix.smem_len, efifb_fix.smem_start);
424 err = -EIO;
425 goto err_release_fb;
426 }
427
428 printk(KERN_INFO "efifb: framebuffer at 0x%lx, mapped to 0x%p, "
429 "using %dk, total %dk\n",
430 efifb_fix.smem_start, info->screen_base,
431 size_remap/1024, size_total/1024);
432 printk(KERN_INFO "efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
433 efifb_defined.xres, efifb_defined.yres,
434 efifb_defined.bits_per_pixel, efifb_fix.line_length,
435 screen_info.pages);
436
437 efifb_defined.xres_virtual = efifb_defined.xres;
438 efifb_defined.yres_virtual = efifb_fix.smem_len /
439 efifb_fix.line_length;
440 printk(KERN_INFO "efifb: scrolling: redraw\n");
441 efifb_defined.yres_virtual = efifb_defined.yres;
442
443 /* some dummy values for timing to make fbset happy */
444 efifb_defined.pixclock = 10000000 / efifb_defined.xres *
445 1000 / efifb_defined.yres;
446 efifb_defined.left_margin = (efifb_defined.xres / 8) & 0xf8;
447 efifb_defined.hsync_len = (efifb_defined.xres / 8) & 0xf8;
448
449 efifb_defined.red.offset = screen_info.red_pos;
450 efifb_defined.red.length = screen_info.red_size;
451 efifb_defined.green.offset = screen_info.green_pos;
452 efifb_defined.green.length = screen_info.green_size;
453 efifb_defined.blue.offset = screen_info.blue_pos;
454 efifb_defined.blue.length = screen_info.blue_size;
455 efifb_defined.transp.offset = screen_info.rsvd_pos;
456 efifb_defined.transp.length = screen_info.rsvd_size;
457
458 printk(KERN_INFO "efifb: %s: "
459 "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
460 "Truecolor",
461 screen_info.rsvd_size,
462 screen_info.red_size,
463 screen_info.green_size,
464 screen_info.blue_size,
465 screen_info.rsvd_pos,
466 screen_info.red_pos,
467 screen_info.green_pos,
468 screen_info.blue_pos);
469
470 efifb_fix.ypanstep = 0;
471 efifb_fix.ywrapstep = 0;
472
473 info->fbops = &efifb_ops;
474 info->var = efifb_defined;
475 info->fix = efifb_fix;
476 info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE;
477
478 if ((err = fb_alloc_cmap(&info->cmap, 256, 0)) < 0) {
479 printk(KERN_ERR "efifb: cannot allocate colormap\n");
480 goto err_unmap;
481 }
482 if ((err = register_framebuffer(info)) < 0) {
483 printk(KERN_ERR "efifb: cannot register framebuffer\n");
484 goto err_fb_dealoc;
485 }
486 printk(KERN_INFO "fb%d: %s frame buffer device\n",
487 info->node, info->fix.id);
488 return 0;
489
490 err_fb_dealoc:
491 fb_dealloc_cmap(&info->cmap);
492 err_unmap:
493 iounmap(info->screen_base);
494 err_release_fb:
495 framebuffer_release(info);
496 err_release_mem:
497 if (request_mem_succeeded)
498 release_mem_region(efifb_fix.smem_start, size_total);
499 return err;
500 }
501
502 static struct platform_driver efifb_driver = {
503 .driver = {
504 .name = "efifb",
505 },
506 };
507
508 static struct platform_device efifb_device = {
509 .name = "efifb",
510 };
511
512 static int __init efifb_init(void)
513 {
514 int ret;
515 char *option = NULL;
516
517 dmi_check_system(dmi_system_table);
518
519 if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
520 return -ENODEV;
521
522 if (fb_get_options("efifb", &option))
523 return -ENODEV;
524 efifb_setup(option);
525
526 /* We don't get linelength from UGA Draw Protocol, only from
527 * EFI Graphics Protocol. So if it's not in DMI, and it's not
528 * passed in from the user, we really can't use the framebuffer.
529 */
530 if (!screen_info.lfb_linelength)
531 return -ENODEV;
532
533 ret = platform_device_register(&efifb_device);
534 if (ret)
535 return ret;
536
537 /*
538 * This is not just an optimization. We will interfere
539 * with a real driver if we get reprobed, so don't allow
540 * it.
541 */
542 ret = platform_driver_probe(&efifb_driver, efifb_probe);
543 if (ret) {
544 platform_device_unregister(&efifb_device);
545 return ret;
546 }
547
548 return ret;
549 }
550 module_init(efifb_init);
551
552 MODULE_LICENSE("GPL");