i2c: tegra: Add stub runtime power management
[linux-2.6.git] / drivers / video / uvesafb.c
1 /*
2  * A framebuffer driver for VBE 2.0+ compliant video cards
3  *
4  * (c) 2007 Michal Januszewski <spock@gentoo.org>
5  *     Loosely based upon the vesafb driver.
6  *
7  */
8 #include <linux/init.h>
9 #include <linux/module.h>
10 #include <linux/moduleparam.h>
11 #include <linux/skbuff.h>
12 #include <linux/timer.h>
13 #include <linux/completion.h>
14 #include <linux/connector.h>
15 #include <linux/random.h>
16 #include <linux/platform_device.h>
17 #include <linux/limits.h>
18 #include <linux/fb.h>
19 #include <linux/io.h>
20 #include <linux/mutex.h>
21 #include <linux/slab.h>
22 #include <video/edid.h>
23 #include <video/uvesafb.h>
24 #ifdef CONFIG_X86
25 #include <video/vga.h>
26 #endif
27 #ifdef CONFIG_MTRR
28 #include <asm/mtrr.h>
29 #endif
30 #include "edid.h"
31
32 static struct cb_id uvesafb_cn_id = {
33         .idx = CN_IDX_V86D,
34         .val = CN_VAL_V86D_UVESAFB
35 };
36 static char v86d_path[PATH_MAX] = "/sbin/v86d";
37 static char v86d_started;       /* has v86d been started by uvesafb? */
38
39 static struct fb_fix_screeninfo uvesafb_fix __devinitdata = {
40         .id     = "VESA VGA",
41         .type   = FB_TYPE_PACKED_PIXELS,
42         .accel  = FB_ACCEL_NONE,
43         .visual = FB_VISUAL_TRUECOLOR,
44 };
45
46 static int mtrr         __devinitdata = 3; /* enable mtrr by default */
47 static int blank        = 1;               /* enable blanking by default */
48 static int ypan         = 1;             /* 0: scroll, 1: ypan, 2: ywrap */
49 static bool pmi_setpal  __devinitdata = true; /* use PMI for palette changes */
50 static int nocrtc       __devinitdata; /* ignore CRTC settings */
51 static int noedid       __devinitdata; /* don't try DDC transfers */
52 static int vram_remap   __devinitdata; /* set amt. of memory to be used */
53 static int vram_total   __devinitdata; /* set total amount of memory */
54 static u16 maxclk       __devinitdata; /* maximum pixel clock */
55 static u16 maxvf        __devinitdata; /* maximum vertical frequency */
56 static u16 maxhf        __devinitdata; /* maximum horizontal frequency */
57 static u16 vbemode      __devinitdata; /* force use of a specific VBE mode */
58 static char *mode_option __devinitdata;
59 static u8  dac_width    = 6;
60
61 static struct uvesafb_ktask *uvfb_tasks[UVESAFB_TASKS_MAX];
62 static DEFINE_MUTEX(uvfb_lock);
63
64 /*
65  * A handler for replies from userspace.
66  *
67  * Make sure each message passes consistency checks and if it does,
68  * find the kernel part of the task struct, copy the registers and
69  * the buffer contents and then complete the task.
70  */
71 static void uvesafb_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
72 {
73         struct uvesafb_task *utask;
74         struct uvesafb_ktask *task;
75
76         if (!cap_raised(current_cap(), CAP_SYS_ADMIN))
77                 return;
78
79         if (msg->seq >= UVESAFB_TASKS_MAX)
80                 return;
81
82         mutex_lock(&uvfb_lock);
83         task = uvfb_tasks[msg->seq];
84
85         if (!task || msg->ack != task->ack) {
86                 mutex_unlock(&uvfb_lock);
87                 return;
88         }
89
90         utask = (struct uvesafb_task *)msg->data;
91
92         /* Sanity checks for the buffer length. */
93         if (task->t.buf_len < utask->buf_len ||
94             utask->buf_len > msg->len - sizeof(*utask)) {
95                 mutex_unlock(&uvfb_lock);
96                 return;
97         }
98
99         uvfb_tasks[msg->seq] = NULL;
100         mutex_unlock(&uvfb_lock);
101
102         memcpy(&task->t, utask, sizeof(*utask));
103
104         if (task->t.buf_len && task->buf)
105                 memcpy(task->buf, utask + 1, task->t.buf_len);
106
107         complete(task->done);
108         return;
109 }
110
111 static int uvesafb_helper_start(void)
112 {
113         char *envp[] = {
114                 "HOME=/",
115                 "PATH=/sbin:/bin",
116                 NULL,
117         };
118
119         char *argv[] = {
120                 v86d_path,
121                 NULL,
122         };
123
124         return call_usermodehelper(v86d_path, argv, envp, 1);
125 }
126
127 /*
128  * Execute a uvesafb task.
129  *
130  * Returns 0 if the task is executed successfully.
131  *
132  * A message sent to the userspace consists of the uvesafb_task
133  * struct and (optionally) a buffer. The uvesafb_task struct is
134  * a simplified version of uvesafb_ktask (its kernel counterpart)
135  * containing only the register values, flags and the length of
136  * the buffer.
137  *
138  * Each message is assigned a sequence number (increased linearly)
139  * and a random ack number. The sequence number is used as a key
140  * for the uvfb_tasks array which holds pointers to uvesafb_ktask
141  * structs for all requests.
142  */
143 static int uvesafb_exec(struct uvesafb_ktask *task)
144 {
145         static int seq;
146         struct cn_msg *m;
147         int err;
148         int len = sizeof(task->t) + task->t.buf_len;
149
150         /*
151          * Check whether the message isn't longer than the maximum
152          * allowed by connector.
153          */
154         if (sizeof(*m) + len > CONNECTOR_MAX_MSG_SIZE) {
155                 printk(KERN_WARNING "uvesafb: message too long (%d), "
156                         "can't execute task\n", (int)(sizeof(*m) + len));
157                 return -E2BIG;
158         }
159
160         m = kzalloc(sizeof(*m) + len, GFP_KERNEL);
161         if (!m)
162                 return -ENOMEM;
163
164         init_completion(task->done);
165
166         memcpy(&m->id, &uvesafb_cn_id, sizeof(m->id));
167         m->seq = seq;
168         m->len = len;
169         m->ack = random32();
170
171         /* uvesafb_task structure */
172         memcpy(m + 1, &task->t, sizeof(task->t));
173
174         /* Buffer */
175         memcpy((u8 *)(m + 1) + sizeof(task->t), task->buf, task->t.buf_len);
176
177         /*
178          * Save the message ack number so that we can find the kernel
179          * part of this task when a reply is received from userspace.
180          */
181         task->ack = m->ack;
182
183         mutex_lock(&uvfb_lock);
184
185         /* If all slots are taken -- bail out. */
186         if (uvfb_tasks[seq]) {
187                 mutex_unlock(&uvfb_lock);
188                 err = -EBUSY;
189                 goto out;
190         }
191
192         /* Save a pointer to the kernel part of the task struct. */
193         uvfb_tasks[seq] = task;
194         mutex_unlock(&uvfb_lock);
195
196         err = cn_netlink_send(m, 0, GFP_KERNEL);
197         if (err == -ESRCH) {
198                 /*
199                  * Try to start the userspace helper if sending
200                  * the request failed the first time.
201                  */
202                 err = uvesafb_helper_start();
203                 if (err) {
204                         printk(KERN_ERR "uvesafb: failed to execute %s\n",
205                                         v86d_path);
206                         printk(KERN_ERR "uvesafb: make sure that the v86d "
207                                         "helper is installed and executable\n");
208                 } else {
209                         v86d_started = 1;
210                         err = cn_netlink_send(m, 0, gfp_any());
211                         if (err == -ENOBUFS)
212                                 err = 0;
213                 }
214         } else if (err == -ENOBUFS)
215                 err = 0;
216
217         if (!err && !(task->t.flags & TF_EXIT))
218                 err = !wait_for_completion_timeout(task->done,
219                                 msecs_to_jiffies(UVESAFB_TIMEOUT));
220
221         mutex_lock(&uvfb_lock);
222         uvfb_tasks[seq] = NULL;
223         mutex_unlock(&uvfb_lock);
224
225         seq++;
226         if (seq >= UVESAFB_TASKS_MAX)
227                 seq = 0;
228 out:
229         kfree(m);
230         return err;
231 }
232
233 /*
234  * Free a uvesafb_ktask struct.
235  */
236 static void uvesafb_free(struct uvesafb_ktask *task)
237 {
238         if (task) {
239                 if (task->done)
240                         kfree(task->done);
241                 kfree(task);
242         }
243 }
244
245 /*
246  * Prepare a uvesafb_ktask struct to be used again.
247  */
248 static void uvesafb_reset(struct uvesafb_ktask *task)
249 {
250         struct completion *cpl = task->done;
251
252         memset(task, 0, sizeof(*task));
253         task->done = cpl;
254 }
255
256 /*
257  * Allocate and prepare a uvesafb_ktask struct.
258  */
259 static struct uvesafb_ktask *uvesafb_prep(void)
260 {
261         struct uvesafb_ktask *task;
262
263         task = kzalloc(sizeof(*task), GFP_KERNEL);
264         if (task) {
265                 task->done = kzalloc(sizeof(*task->done), GFP_KERNEL);
266                 if (!task->done) {
267                         kfree(task);
268                         task = NULL;
269                 }
270         }
271         return task;
272 }
273
274 static void uvesafb_setup_var(struct fb_var_screeninfo *var,
275                 struct fb_info *info, struct vbe_mode_ib *mode)
276 {
277         struct uvesafb_par *par = info->par;
278
279         var->vmode = FB_VMODE_NONINTERLACED;
280         var->sync = FB_SYNC_VERT_HIGH_ACT;
281
282         var->xres = mode->x_res;
283         var->yres = mode->y_res;
284         var->xres_virtual = mode->x_res;
285         var->yres_virtual = (par->ypan) ?
286                         info->fix.smem_len / mode->bytes_per_scan_line :
287                         mode->y_res;
288         var->xoffset = 0;
289         var->yoffset = 0;
290         var->bits_per_pixel = mode->bits_per_pixel;
291
292         if (var->bits_per_pixel == 15)
293                 var->bits_per_pixel = 16;
294
295         if (var->bits_per_pixel > 8) {
296                 var->red.offset    = mode->red_off;
297                 var->red.length    = mode->red_len;
298                 var->green.offset  = mode->green_off;
299                 var->green.length  = mode->green_len;
300                 var->blue.offset   = mode->blue_off;
301                 var->blue.length   = mode->blue_len;
302                 var->transp.offset = mode->rsvd_off;
303                 var->transp.length = mode->rsvd_len;
304         } else {
305                 var->red.offset    = 0;
306                 var->green.offset  = 0;
307                 var->blue.offset   = 0;
308                 var->transp.offset = 0;
309
310                 var->red.length    = 8;
311                 var->green.length  = 8;
312                 var->blue.length   = 8;
313                 var->transp.length = 0;
314         }
315 }
316
317 static int uvesafb_vbe_find_mode(struct uvesafb_par *par,
318                 int xres, int yres, int depth, unsigned char flags)
319 {
320         int i, match = -1, h = 0, d = 0x7fffffff;
321
322         for (i = 0; i < par->vbe_modes_cnt; i++) {
323                 h = abs(par->vbe_modes[i].x_res - xres) +
324                     abs(par->vbe_modes[i].y_res - yres) +
325                     abs(depth - par->vbe_modes[i].depth);
326
327                 /*
328                  * We have an exact match in terms of resolution
329                  * and depth.
330                  */
331                 if (h == 0)
332                         return i;
333
334                 if (h < d || (h == d && par->vbe_modes[i].depth > depth)) {
335                         d = h;
336                         match = i;
337                 }
338         }
339         i = 1;
340
341         if (flags & UVESAFB_EXACT_DEPTH &&
342                         par->vbe_modes[match].depth != depth)
343                 i = 0;
344
345         if (flags & UVESAFB_EXACT_RES && d > 24)
346                 i = 0;
347
348         if (i != 0)
349                 return match;
350         else
351                 return -1;
352 }
353
354 static u8 *uvesafb_vbe_state_save(struct uvesafb_par *par)
355 {
356         struct uvesafb_ktask *task;
357         u8 *state;
358         int err;
359
360         if (!par->vbe_state_size)
361                 return NULL;
362
363         state = kmalloc(par->vbe_state_size, GFP_KERNEL);
364         if (!state)
365                 return NULL;
366
367         task = uvesafb_prep();
368         if (!task) {
369                 kfree(state);
370                 return NULL;
371         }
372
373         task->t.regs.eax = 0x4f04;
374         task->t.regs.ecx = 0x000f;
375         task->t.regs.edx = 0x0001;
376         task->t.flags = TF_BUF_RET | TF_BUF_ESBX;
377         task->t.buf_len = par->vbe_state_size;
378         task->buf = state;
379         err = uvesafb_exec(task);
380
381         if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
382                 printk(KERN_WARNING "uvesafb: VBE get state call "
383                                 "failed (eax=0x%x, err=%d)\n",
384                                 task->t.regs.eax, err);
385                 kfree(state);
386                 state = NULL;
387         }
388
389         uvesafb_free(task);
390         return state;
391 }
392
393 static void uvesafb_vbe_state_restore(struct uvesafb_par *par, u8 *state_buf)
394 {
395         struct uvesafb_ktask *task;
396         int err;
397
398         if (!state_buf)
399                 return;
400
401         task = uvesafb_prep();
402         if (!task)
403                 return;
404
405         task->t.regs.eax = 0x4f04;
406         task->t.regs.ecx = 0x000f;
407         task->t.regs.edx = 0x0002;
408         task->t.buf_len = par->vbe_state_size;
409         task->t.flags = TF_BUF_ESBX;
410         task->buf = state_buf;
411
412         err = uvesafb_exec(task);
413         if (err || (task->t.regs.eax & 0xffff) != 0x004f)
414                 printk(KERN_WARNING "uvesafb: VBE state restore call "
415                                 "failed (eax=0x%x, err=%d)\n",
416                                 task->t.regs.eax, err);
417
418         uvesafb_free(task);
419 }
420
421 static int __devinit uvesafb_vbe_getinfo(struct uvesafb_ktask *task,
422                 struct uvesafb_par *par)
423 {
424         int err;
425
426         task->t.regs.eax = 0x4f00;
427         task->t.flags = TF_VBEIB;
428         task->t.buf_len = sizeof(struct vbe_ib);
429         task->buf = &par->vbe_ib;
430         strncpy(par->vbe_ib.vbe_signature, "VBE2", 4);
431
432         err = uvesafb_exec(task);
433         if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
434                 printk(KERN_ERR "uvesafb: Getting VBE info block failed "
435                                 "(eax=0x%x, err=%d)\n", (u32)task->t.regs.eax,
436                                 err);
437                 return -EINVAL;
438         }
439
440         if (par->vbe_ib.vbe_version < 0x0200) {
441                 printk(KERN_ERR "uvesafb: Sorry, pre-VBE 2.0 cards are "
442                                 "not supported.\n");
443                 return -EINVAL;
444         }
445
446         if (!par->vbe_ib.mode_list_ptr) {
447                 printk(KERN_ERR "uvesafb: Missing mode list!\n");
448                 return -EINVAL;
449         }
450
451         printk(KERN_INFO "uvesafb: ");
452
453         /*
454          * Convert string pointers and the mode list pointer into
455          * usable addresses. Print informational messages about the
456          * video adapter and its vendor.
457          */
458         if (par->vbe_ib.oem_vendor_name_ptr)
459                 printk("%s, ",
460                         ((char *)task->buf) + par->vbe_ib.oem_vendor_name_ptr);
461
462         if (par->vbe_ib.oem_product_name_ptr)
463                 printk("%s, ",
464                         ((char *)task->buf) + par->vbe_ib.oem_product_name_ptr);
465
466         if (par->vbe_ib.oem_product_rev_ptr)
467                 printk("%s, ",
468                         ((char *)task->buf) + par->vbe_ib.oem_product_rev_ptr);
469
470         if (par->vbe_ib.oem_string_ptr)
471                 printk("OEM: %s, ",
472                         ((char *)task->buf) + par->vbe_ib.oem_string_ptr);
473
474         printk("VBE v%d.%d\n", ((par->vbe_ib.vbe_version & 0xff00) >> 8),
475                         par->vbe_ib.vbe_version & 0xff);
476
477         return 0;
478 }
479
480 static int __devinit uvesafb_vbe_getmodes(struct uvesafb_ktask *task,
481                 struct uvesafb_par *par)
482 {
483         int off = 0, err;
484         u16 *mode;
485
486         par->vbe_modes_cnt = 0;
487
488         /* Count available modes. */
489         mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
490         while (*mode != 0xffff) {
491                 par->vbe_modes_cnt++;
492                 mode++;
493         }
494
495         par->vbe_modes = kzalloc(sizeof(struct vbe_mode_ib) *
496                                 par->vbe_modes_cnt, GFP_KERNEL);
497         if (!par->vbe_modes)
498                 return -ENOMEM;
499
500         /* Get info about all available modes. */
501         mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
502         while (*mode != 0xffff) {
503                 struct vbe_mode_ib *mib;
504
505                 uvesafb_reset(task);
506                 task->t.regs.eax = 0x4f01;
507                 task->t.regs.ecx = (u32) *mode;
508                 task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
509                 task->t.buf_len = sizeof(struct vbe_mode_ib);
510                 task->buf = par->vbe_modes + off;
511
512                 err = uvesafb_exec(task);
513                 if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
514                         printk(KERN_WARNING "uvesafb: Getting mode info block "
515                                 "for mode 0x%x failed (eax=0x%x, err=%d)\n",
516                                 *mode, (u32)task->t.regs.eax, err);
517                         mode++;
518                         par->vbe_modes_cnt--;
519                         continue;
520                 }
521
522                 mib = task->buf;
523                 mib->mode_id = *mode;
524
525                 /*
526                  * We only want modes that are supported with the current
527                  * hardware configuration, color, graphics and that have
528                  * support for the LFB.
529                  */
530                 if ((mib->mode_attr & VBE_MODE_MASK) == VBE_MODE_MASK &&
531                                  mib->bits_per_pixel >= 8)
532                         off++;
533                 else
534                         par->vbe_modes_cnt--;
535
536                 mode++;
537                 mib->depth = mib->red_len + mib->green_len + mib->blue_len;
538
539                 /*
540                  * Handle 8bpp modes and modes with broken color component
541                  * lengths.
542                  */
543                 if (mib->depth == 0 || (mib->depth == 24 &&
544                                         mib->bits_per_pixel == 32))
545                         mib->depth = mib->bits_per_pixel;
546         }
547
548         if (par->vbe_modes_cnt > 0)
549                 return 0;
550         else
551                 return -EINVAL;
552 }
553
554 /*
555  * The Protected Mode Interface is 32-bit x86 code, so we only run it on
556  * x86 and not x86_64.
557  */
558 #ifdef CONFIG_X86_32
559 static int __devinit uvesafb_vbe_getpmi(struct uvesafb_ktask *task,
560                 struct uvesafb_par *par)
561 {
562         int i, err;
563
564         uvesafb_reset(task);
565         task->t.regs.eax = 0x4f0a;
566         task->t.regs.ebx = 0x0;
567         err = uvesafb_exec(task);
568
569         if ((task->t.regs.eax & 0xffff) != 0x4f || task->t.regs.es < 0xc000) {
570                 par->pmi_setpal = par->ypan = 0;
571         } else {
572                 par->pmi_base = (u16 *)phys_to_virt(((u32)task->t.regs.es << 4)
573                                                 + task->t.regs.edi);
574                 par->pmi_start = (u8 *)par->pmi_base + par->pmi_base[1];
575                 par->pmi_pal = (u8 *)par->pmi_base + par->pmi_base[2];
576                 printk(KERN_INFO "uvesafb: protected mode interface info at "
577                                  "%04x:%04x\n",
578                                  (u16)task->t.regs.es, (u16)task->t.regs.edi);
579                 printk(KERN_INFO "uvesafb: pmi: set display start = %p, "
580                                  "set palette = %p\n", par->pmi_start,
581                                  par->pmi_pal);
582
583                 if (par->pmi_base[3]) {
584                         printk(KERN_INFO "uvesafb: pmi: ports = ");
585                         for (i = par->pmi_base[3]/2;
586                                         par->pmi_base[i] != 0xffff; i++)
587                                 printk("%x ", par->pmi_base[i]);
588                         printk("\n");
589
590                         if (par->pmi_base[i] != 0xffff) {
591                                 printk(KERN_INFO "uvesafb: can't handle memory"
592                                                  " requests, pmi disabled\n");
593                                 par->ypan = par->pmi_setpal = 0;
594                         }
595                 }
596         }
597         return 0;
598 }
599 #endif /* CONFIG_X86_32 */
600
601 /*
602  * Check whether a video mode is supported by the Video BIOS and is
603  * compatible with the monitor limits.
604  */
605 static int __devinit uvesafb_is_valid_mode(struct fb_videomode *mode,
606                 struct fb_info *info)
607 {
608         if (info->monspecs.gtf) {
609                 fb_videomode_to_var(&info->var, mode);
610                 if (fb_validate_mode(&info->var, info))
611                         return 0;
612         }
613
614         if (uvesafb_vbe_find_mode(info->par, mode->xres, mode->yres, 8,
615                                 UVESAFB_EXACT_RES) == -1)
616                 return 0;
617
618         return 1;
619 }
620
621 static int __devinit uvesafb_vbe_getedid(struct uvesafb_ktask *task,
622                 struct fb_info *info)
623 {
624         struct uvesafb_par *par = info->par;
625         int err = 0;
626
627         if (noedid || par->vbe_ib.vbe_version < 0x0300)
628                 return -EINVAL;
629
630         task->t.regs.eax = 0x4f15;
631         task->t.regs.ebx = 0;
632         task->t.regs.ecx = 0;
633         task->t.buf_len = 0;
634         task->t.flags = 0;
635
636         err = uvesafb_exec(task);
637
638         if ((task->t.regs.eax & 0xffff) != 0x004f || err)
639                 return -EINVAL;
640
641         if ((task->t.regs.ebx & 0x3) == 3) {
642                 printk(KERN_INFO "uvesafb: VBIOS/hardware supports both "
643                                  "DDC1 and DDC2 transfers\n");
644         } else if ((task->t.regs.ebx & 0x3) == 2) {
645                 printk(KERN_INFO "uvesafb: VBIOS/hardware supports DDC2 "
646                                  "transfers\n");
647         } else if ((task->t.regs.ebx & 0x3) == 1) {
648                 printk(KERN_INFO "uvesafb: VBIOS/hardware supports DDC1 "
649                                  "transfers\n");
650         } else {
651                 printk(KERN_INFO "uvesafb: VBIOS/hardware doesn't support "
652                                  "DDC transfers\n");
653                 return -EINVAL;
654         }
655
656         task->t.regs.eax = 0x4f15;
657         task->t.regs.ebx = 1;
658         task->t.regs.ecx = task->t.regs.edx = 0;
659         task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
660         task->t.buf_len = EDID_LENGTH;
661         task->buf = kzalloc(EDID_LENGTH, GFP_KERNEL);
662
663         err = uvesafb_exec(task);
664
665         if ((task->t.regs.eax & 0xffff) == 0x004f && !err) {
666                 fb_edid_to_monspecs(task->buf, &info->monspecs);
667
668                 if (info->monspecs.vfmax && info->monspecs.hfmax) {
669                         /*
670                          * If the maximum pixel clock wasn't specified in
671                          * the EDID block, set it to 300 MHz.
672                          */
673                         if (info->monspecs.dclkmax == 0)
674                                 info->monspecs.dclkmax = 300 * 1000000;
675                         info->monspecs.gtf = 1;
676                 }
677         } else {
678                 err = -EINVAL;
679         }
680
681         kfree(task->buf);
682         return err;
683 }
684
685 static void __devinit uvesafb_vbe_getmonspecs(struct uvesafb_ktask *task,
686                 struct fb_info *info)
687 {
688         struct uvesafb_par *par = info->par;
689         int i;
690
691         memset(&info->monspecs, 0, sizeof(info->monspecs));
692
693         /*
694          * If we don't get all necessary data from the EDID block,
695          * mark it as incompatible with the GTF and set nocrtc so
696          * that we always use the default BIOS refresh rate.
697          */
698         if (uvesafb_vbe_getedid(task, info)) {
699                 info->monspecs.gtf = 0;
700                 par->nocrtc = 1;
701         }
702
703         /* Kernel command line overrides. */
704         if (maxclk)
705                 info->monspecs.dclkmax = maxclk * 1000000;
706         if (maxvf)
707                 info->monspecs.vfmax = maxvf;
708         if (maxhf)
709                 info->monspecs.hfmax = maxhf * 1000;
710
711         /*
712          * In case DDC transfers are not supported, the user can provide
713          * monitor limits manually. Lower limits are set to "safe" values.
714          */
715         if (info->monspecs.gtf == 0 && maxclk && maxvf && maxhf) {
716                 info->monspecs.dclkmin = 0;
717                 info->monspecs.vfmin = 60;
718                 info->monspecs.hfmin = 29000;
719                 info->monspecs.gtf = 1;
720                 par->nocrtc = 0;
721         }
722
723         if (info->monspecs.gtf)
724                 printk(KERN_INFO
725                         "uvesafb: monitor limits: vf = %d Hz, hf = %d kHz, "
726                         "clk = %d MHz\n", info->monspecs.vfmax,
727                         (int)(info->monspecs.hfmax / 1000),
728                         (int)(info->monspecs.dclkmax / 1000000));
729         else
730                 printk(KERN_INFO "uvesafb: no monitor limits have been set, "
731                                  "default refresh rate will be used\n");
732
733         /* Add VBE modes to the modelist. */
734         for (i = 0; i < par->vbe_modes_cnt; i++) {
735                 struct fb_var_screeninfo var;
736                 struct vbe_mode_ib *mode;
737                 struct fb_videomode vmode;
738
739                 mode = &par->vbe_modes[i];
740                 memset(&var, 0, sizeof(var));
741
742                 var.xres = mode->x_res;
743                 var.yres = mode->y_res;
744
745                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, &var, info);
746                 fb_var_to_videomode(&vmode, &var);
747                 fb_add_videomode(&vmode, &info->modelist);
748         }
749
750         /* Add valid VESA modes to our modelist. */
751         for (i = 0; i < VESA_MODEDB_SIZE; i++) {
752                 if (uvesafb_is_valid_mode((struct fb_videomode *)
753                                                 &vesa_modes[i], info))
754                         fb_add_videomode(&vesa_modes[i], &info->modelist);
755         }
756
757         for (i = 0; i < info->monspecs.modedb_len; i++) {
758                 if (uvesafb_is_valid_mode(&info->monspecs.modedb[i], info))
759                         fb_add_videomode(&info->monspecs.modedb[i],
760                                         &info->modelist);
761         }
762
763         return;
764 }
765
766 static void __devinit uvesafb_vbe_getstatesize(struct uvesafb_ktask *task,
767                 struct uvesafb_par *par)
768 {
769         int err;
770
771         uvesafb_reset(task);
772
773         /*
774          * Get the VBE state buffer size. We want all available
775          * hardware state data (CL = 0x0f).
776          */
777         task->t.regs.eax = 0x4f04;
778         task->t.regs.ecx = 0x000f;
779         task->t.regs.edx = 0x0000;
780         task->t.flags = 0;
781
782         err = uvesafb_exec(task);
783
784         if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
785                 printk(KERN_WARNING "uvesafb: VBE state buffer size "
786                         "cannot be determined (eax=0x%x, err=%d)\n",
787                         task->t.regs.eax, err);
788                 par->vbe_state_size = 0;
789                 return;
790         }
791
792         par->vbe_state_size = 64 * (task->t.regs.ebx & 0xffff);
793 }
794
795 static int __devinit uvesafb_vbe_init(struct fb_info *info)
796 {
797         struct uvesafb_ktask *task = NULL;
798         struct uvesafb_par *par = info->par;
799         int err;
800
801         task = uvesafb_prep();
802         if (!task)
803                 return -ENOMEM;
804
805         err = uvesafb_vbe_getinfo(task, par);
806         if (err)
807                 goto out;
808
809         err = uvesafb_vbe_getmodes(task, par);
810         if (err)
811                 goto out;
812
813         par->nocrtc = nocrtc;
814 #ifdef CONFIG_X86_32
815         par->pmi_setpal = pmi_setpal;
816         par->ypan = ypan;
817
818         if (par->pmi_setpal || par->ypan)
819                 uvesafb_vbe_getpmi(task, par);
820 #else
821         /* The protected mode interface is not available on non-x86. */
822         par->pmi_setpal = par->ypan = 0;
823 #endif
824
825         INIT_LIST_HEAD(&info->modelist);
826         uvesafb_vbe_getmonspecs(task, info);
827         uvesafb_vbe_getstatesize(task, par);
828
829 out:    uvesafb_free(task);
830         return err;
831 }
832
833 static int __devinit uvesafb_vbe_init_mode(struct fb_info *info)
834 {
835         struct list_head *pos;
836         struct fb_modelist *modelist;
837         struct fb_videomode *mode;
838         struct uvesafb_par *par = info->par;
839         int i, modeid;
840
841         /* Has the user requested a specific VESA mode? */
842         if (vbemode) {
843                 for (i = 0; i < par->vbe_modes_cnt; i++) {
844                         if (par->vbe_modes[i].mode_id == vbemode) {
845                                 modeid = i;
846                                 uvesafb_setup_var(&info->var, info,
847                                                 &par->vbe_modes[modeid]);
848                                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
849                                                 &info->var, info);
850                                 /*
851                                  * With pixclock set to 0, the default BIOS
852                                  * timings will be used in set_par().
853                                  */
854                                 info->var.pixclock = 0;
855                                 goto gotmode;
856                         }
857                 }
858                 printk(KERN_INFO "uvesafb: requested VBE mode 0x%x is "
859                                  "unavailable\n", vbemode);
860                 vbemode = 0;
861         }
862
863         /* Count the modes in the modelist */
864         i = 0;
865         list_for_each(pos, &info->modelist)
866                 i++;
867
868         /*
869          * Convert the modelist into a modedb so that we can use it with
870          * fb_find_mode().
871          */
872         mode = kzalloc(i * sizeof(*mode), GFP_KERNEL);
873         if (mode) {
874                 i = 0;
875                 list_for_each(pos, &info->modelist) {
876                         modelist = list_entry(pos, struct fb_modelist, list);
877                         mode[i] = modelist->mode;
878                         i++;
879                 }
880
881                 if (!mode_option)
882                         mode_option = UVESAFB_DEFAULT_MODE;
883
884                 i = fb_find_mode(&info->var, info, mode_option, mode, i,
885                         NULL, 8);
886
887                 kfree(mode);
888         }
889
890         /* fb_find_mode() failed */
891         if (i == 0) {
892                 info->var.xres = 640;
893                 info->var.yres = 480;
894                 mode = (struct fb_videomode *)
895                                 fb_find_best_mode(&info->var, &info->modelist);
896
897                 if (mode) {
898                         fb_videomode_to_var(&info->var, mode);
899                 } else {
900                         modeid = par->vbe_modes[0].mode_id;
901                         uvesafb_setup_var(&info->var, info,
902                                         &par->vbe_modes[modeid]);
903                         fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
904                                         &info->var, info);
905
906                         goto gotmode;
907                 }
908         }
909
910         /* Look for a matching VBE mode. */
911         modeid = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres,
912                         info->var.bits_per_pixel, UVESAFB_EXACT_RES);
913
914         if (modeid == -1)
915                 return -EINVAL;
916
917         uvesafb_setup_var(&info->var, info, &par->vbe_modes[modeid]);
918
919 gotmode:
920         /*
921          * If we are not VBE3.0+ compliant, we're done -- the BIOS will
922          * ignore our timings anyway.
923          */
924         if (par->vbe_ib.vbe_version < 0x0300 || par->nocrtc)
925                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
926                                         &info->var, info);
927
928         return modeid;
929 }
930
931 static int uvesafb_setpalette(struct uvesafb_pal_entry *entries, int count,
932                 int start, struct fb_info *info)
933 {
934         struct uvesafb_ktask *task;
935 #ifdef CONFIG_X86
936         struct uvesafb_par *par = info->par;
937         int i = par->mode_idx;
938 #endif
939         int err = 0;
940
941         /*
942          * We support palette modifications for 8 bpp modes only, so
943          * there can never be more than 256 entries.
944          */
945         if (start + count > 256)
946                 return -EINVAL;
947
948 #ifdef CONFIG_X86
949         /* Use VGA registers if mode is VGA-compatible. */
950         if (i >= 0 && i < par->vbe_modes_cnt &&
951             par->vbe_modes[i].mode_attr & VBE_MODE_VGACOMPAT) {
952                 for (i = 0; i < count; i++) {
953                         outb_p(start + i,        dac_reg);
954                         outb_p(entries[i].red,   dac_val);
955                         outb_p(entries[i].green, dac_val);
956                         outb_p(entries[i].blue,  dac_val);
957                 }
958         }
959 #ifdef CONFIG_X86_32
960         else if (par->pmi_setpal) {
961                 __asm__ __volatile__(
962                 "call *(%%esi)"
963                 : /* no return value */
964                 : "a" (0x4f09),         /* EAX */
965                   "b" (0),              /* EBX */
966                   "c" (count),          /* ECX */
967                   "d" (start),          /* EDX */
968                   "D" (entries),        /* EDI */
969                   "S" (&par->pmi_pal)); /* ESI */
970         }
971 #endif /* CONFIG_X86_32 */
972         else
973 #endif /* CONFIG_X86 */
974         {
975                 task = uvesafb_prep();
976                 if (!task)
977                         return -ENOMEM;
978
979                 task->t.regs.eax = 0x4f09;
980                 task->t.regs.ebx = 0x0;
981                 task->t.regs.ecx = count;
982                 task->t.regs.edx = start;
983                 task->t.flags = TF_BUF_ESDI;
984                 task->t.buf_len = sizeof(struct uvesafb_pal_entry) * count;
985                 task->buf = entries;
986
987                 err = uvesafb_exec(task);
988                 if ((task->t.regs.eax & 0xffff) != 0x004f)
989                         err = 1;
990
991                 uvesafb_free(task);
992         }
993         return err;
994 }
995
996 static int uvesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
997                 unsigned blue, unsigned transp,
998                 struct fb_info *info)
999 {
1000         struct uvesafb_pal_entry entry;
1001         int shift = 16 - dac_width;
1002         int err = 0;
1003
1004         if (regno >= info->cmap.len)
1005                 return -EINVAL;
1006
1007         if (info->var.bits_per_pixel == 8) {
1008                 entry.red   = red   >> shift;
1009                 entry.green = green >> shift;
1010                 entry.blue  = blue  >> shift;
1011                 entry.pad   = 0;
1012
1013                 err = uvesafb_setpalette(&entry, 1, regno, info);
1014         } else if (regno < 16) {
1015                 switch (info->var.bits_per_pixel) {
1016                 case 16:
1017                         if (info->var.red.offset == 10) {
1018                                 /* 1:5:5:5 */
1019                                 ((u32 *) (info->pseudo_palette))[regno] =
1020                                                 ((red   & 0xf800) >>  1) |
1021                                                 ((green & 0xf800) >>  6) |
1022                                                 ((blue  & 0xf800) >> 11);
1023                         } else {
1024                                 /* 0:5:6:5 */
1025                                 ((u32 *) (info->pseudo_palette))[regno] =
1026                                                 ((red   & 0xf800)      ) |
1027                                                 ((green & 0xfc00) >>  5) |
1028                                                 ((blue  & 0xf800) >> 11);
1029                         }
1030                         break;
1031
1032                 case 24:
1033                 case 32:
1034                         red   >>= 8;
1035                         green >>= 8;
1036                         blue  >>= 8;
1037                         ((u32 *)(info->pseudo_palette))[regno] =
1038                                 (red   << info->var.red.offset)   |
1039                                 (green << info->var.green.offset) |
1040                                 (blue  << info->var.blue.offset);
1041                         break;
1042                 }
1043         }
1044         return err;
1045 }
1046
1047 static int uvesafb_setcmap(struct fb_cmap *cmap, struct fb_info *info)
1048 {
1049         struct uvesafb_pal_entry *entries;
1050         int shift = 16 - dac_width;
1051         int i, err = 0;
1052
1053         if (info->var.bits_per_pixel == 8) {
1054                 if (cmap->start + cmap->len > info->cmap.start +
1055                     info->cmap.len || cmap->start < info->cmap.start)
1056                         return -EINVAL;
1057
1058                 entries = kmalloc(sizeof(*entries) * cmap->len, GFP_KERNEL);
1059                 if (!entries)
1060                         return -ENOMEM;
1061
1062                 for (i = 0; i < cmap->len; i++) {
1063                         entries[i].red   = cmap->red[i]   >> shift;
1064                         entries[i].green = cmap->green[i] >> shift;
1065                         entries[i].blue  = cmap->blue[i]  >> shift;
1066                         entries[i].pad   = 0;
1067                 }
1068                 err = uvesafb_setpalette(entries, cmap->len, cmap->start, info);
1069                 kfree(entries);
1070         } else {
1071                 /*
1072                  * For modes with bpp > 8, we only set the pseudo palette in
1073                  * the fb_info struct. We rely on uvesafb_setcolreg to do all
1074                  * sanity checking.
1075                  */
1076                 for (i = 0; i < cmap->len; i++) {
1077                         err |= uvesafb_setcolreg(cmap->start + i, cmap->red[i],
1078                                                 cmap->green[i], cmap->blue[i],
1079                                                 0, info);
1080                 }
1081         }
1082         return err;
1083 }
1084
1085 static int uvesafb_pan_display(struct fb_var_screeninfo *var,
1086                 struct fb_info *info)
1087 {
1088 #ifdef CONFIG_X86_32
1089         int offset;
1090         struct uvesafb_par *par = info->par;
1091
1092         offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
1093
1094         /*
1095          * It turns out it's not the best idea to do panning via vm86,
1096          * so we only allow it if we have a PMI.
1097          */
1098         if (par->pmi_start) {
1099                 __asm__ __volatile__(
1100                         "call *(%%edi)"
1101                         : /* no return value */
1102                         : "a" (0x4f07),         /* EAX */
1103                           "b" (0),              /* EBX */
1104                           "c" (offset),         /* ECX */
1105                           "d" (offset >> 16),   /* EDX */
1106                           "D" (&par->pmi_start));    /* EDI */
1107         }
1108 #endif
1109         return 0;
1110 }
1111
1112 static int uvesafb_blank(int blank, struct fb_info *info)
1113 {
1114         struct uvesafb_ktask *task;
1115         int err = 1;
1116 #ifdef CONFIG_X86
1117         struct uvesafb_par *par = info->par;
1118
1119         if (par->vbe_ib.capabilities & VBE_CAP_VGACOMPAT) {
1120                 int loop = 10000;
1121                 u8 seq = 0, crtc17 = 0;
1122
1123                 if (blank == FB_BLANK_POWERDOWN) {
1124                         seq = 0x20;
1125                         crtc17 = 0x00;
1126                         err = 0;
1127                 } else {
1128                         seq = 0x00;
1129                         crtc17 = 0x80;
1130                         err = (blank == FB_BLANK_UNBLANK) ? 0 : -EINVAL;
1131                 }
1132
1133                 vga_wseq(NULL, 0x00, 0x01);
1134                 seq |= vga_rseq(NULL, 0x01) & ~0x20;
1135                 vga_wseq(NULL, 0x00, seq);
1136
1137                 crtc17 |= vga_rcrt(NULL, 0x17) & ~0x80;
1138                 while (loop--);
1139                 vga_wcrt(NULL, 0x17, crtc17);
1140                 vga_wseq(NULL, 0x00, 0x03);
1141         } else
1142 #endif /* CONFIG_X86 */
1143         {
1144                 task = uvesafb_prep();
1145                 if (!task)
1146                         return -ENOMEM;
1147
1148                 task->t.regs.eax = 0x4f10;
1149                 switch (blank) {
1150                 case FB_BLANK_UNBLANK:
1151                         task->t.regs.ebx = 0x0001;
1152                         break;
1153                 case FB_BLANK_NORMAL:
1154                         task->t.regs.ebx = 0x0101;      /* standby */
1155                         break;
1156                 case FB_BLANK_POWERDOWN:
1157                         task->t.regs.ebx = 0x0401;      /* powerdown */
1158                         break;
1159                 default:
1160                         goto out;
1161                 }
1162
1163                 err = uvesafb_exec(task);
1164                 if (err || (task->t.regs.eax & 0xffff) != 0x004f)
1165                         err = 1;
1166 out:            uvesafb_free(task);
1167         }
1168         return err;
1169 }
1170
1171 static int uvesafb_open(struct fb_info *info, int user)
1172 {
1173         struct uvesafb_par *par = info->par;
1174         int cnt = atomic_read(&par->ref_count);
1175
1176         if (!cnt && par->vbe_state_size)
1177                 par->vbe_state_orig = uvesafb_vbe_state_save(par);
1178
1179         atomic_inc(&par->ref_count);
1180         return 0;
1181 }
1182
1183 static int uvesafb_release(struct fb_info *info, int user)
1184 {
1185         struct uvesafb_ktask *task = NULL;
1186         struct uvesafb_par *par = info->par;
1187         int cnt = atomic_read(&par->ref_count);
1188
1189         if (!cnt)
1190                 return -EINVAL;
1191
1192         if (cnt != 1)
1193                 goto out;
1194
1195         task = uvesafb_prep();
1196         if (!task)
1197                 goto out;
1198
1199         /* First, try to set the standard 80x25 text mode. */
1200         task->t.regs.eax = 0x0003;
1201         uvesafb_exec(task);
1202
1203         /*
1204          * Now try to restore whatever hardware state we might have
1205          * saved when the fb device was first opened.
1206          */
1207         uvesafb_vbe_state_restore(par, par->vbe_state_orig);
1208 out:
1209         atomic_dec(&par->ref_count);
1210         if (task)
1211                 uvesafb_free(task);
1212         return 0;
1213 }
1214
1215 static int uvesafb_set_par(struct fb_info *info)
1216 {
1217         struct uvesafb_par *par = info->par;
1218         struct uvesafb_ktask *task = NULL;
1219         struct vbe_crtc_ib *crtc = NULL;
1220         struct vbe_mode_ib *mode = NULL;
1221         int i, err = 0, depth = info->var.bits_per_pixel;
1222
1223         if (depth > 8 && depth != 32)
1224                 depth = info->var.red.length + info->var.green.length +
1225                         info->var.blue.length;
1226
1227         i = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres, depth,
1228                                  UVESAFB_EXACT_RES | UVESAFB_EXACT_DEPTH);
1229         if (i >= 0)
1230                 mode = &par->vbe_modes[i];
1231         else
1232                 return -EINVAL;
1233
1234         task = uvesafb_prep();
1235         if (!task)
1236                 return -ENOMEM;
1237 setmode:
1238         task->t.regs.eax = 0x4f02;
1239         task->t.regs.ebx = mode->mode_id | 0x4000;      /* use LFB */
1240
1241         if (par->vbe_ib.vbe_version >= 0x0300 && !par->nocrtc &&
1242             info->var.pixclock != 0) {
1243                 task->t.regs.ebx |= 0x0800;             /* use CRTC data */
1244                 task->t.flags = TF_BUF_ESDI;
1245                 crtc = kzalloc(sizeof(struct vbe_crtc_ib), GFP_KERNEL);
1246                 if (!crtc) {
1247                         err = -ENOMEM;
1248                         goto out;
1249                 }
1250                 crtc->horiz_start = info->var.xres + info->var.right_margin;
1251                 crtc->horiz_end   = crtc->horiz_start + info->var.hsync_len;
1252                 crtc->horiz_total = crtc->horiz_end + info->var.left_margin;
1253
1254                 crtc->vert_start  = info->var.yres + info->var.lower_margin;
1255                 crtc->vert_end    = crtc->vert_start + info->var.vsync_len;
1256                 crtc->vert_total  = crtc->vert_end + info->var.upper_margin;
1257
1258                 crtc->pixel_clock = PICOS2KHZ(info->var.pixclock) * 1000;
1259                 crtc->refresh_rate = (u16)(100 * (crtc->pixel_clock /
1260                                 (crtc->vert_total * crtc->horiz_total)));
1261
1262                 if (info->var.vmode & FB_VMODE_DOUBLE)
1263                         crtc->flags |= 0x1;
1264                 if (info->var.vmode & FB_VMODE_INTERLACED)
1265                         crtc->flags |= 0x2;
1266                 if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
1267                         crtc->flags |= 0x4;
1268                 if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
1269                         crtc->flags |= 0x8;
1270                 memcpy(&par->crtc, crtc, sizeof(*crtc));
1271         } else {
1272                 memset(&par->crtc, 0, sizeof(*crtc));
1273         }
1274
1275         task->t.buf_len = sizeof(struct vbe_crtc_ib);
1276         task->buf = &par->crtc;
1277
1278         err = uvesafb_exec(task);
1279         if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
1280                 /*
1281                  * The mode switch might have failed because we tried to
1282                  * use our own timings.  Try again with the default timings.
1283                  */
1284                 if (crtc != NULL) {
1285                         printk(KERN_WARNING "uvesafb: mode switch failed "
1286                                 "(eax=0x%x, err=%d). Trying again with "
1287                                 "default timings.\n", task->t.regs.eax, err);
1288                         uvesafb_reset(task);
1289                         kfree(crtc);
1290                         crtc = NULL;
1291                         info->var.pixclock = 0;
1292                         goto setmode;
1293                 } else {
1294                         printk(KERN_ERR "uvesafb: mode switch failed (eax="
1295                                 "0x%x, err=%d)\n", task->t.regs.eax, err);
1296                         err = -EINVAL;
1297                         goto out;
1298                 }
1299         }
1300         par->mode_idx = i;
1301
1302         /* For 8bpp modes, always try to set the DAC to 8 bits. */
1303         if (par->vbe_ib.capabilities & VBE_CAP_CAN_SWITCH_DAC &&
1304             mode->bits_per_pixel <= 8) {
1305                 uvesafb_reset(task);
1306                 task->t.regs.eax = 0x4f08;
1307                 task->t.regs.ebx = 0x0800;
1308
1309                 err = uvesafb_exec(task);
1310                 if (err || (task->t.regs.eax & 0xffff) != 0x004f ||
1311                     ((task->t.regs.ebx & 0xff00) >> 8) != 8) {
1312                         dac_width = 6;
1313                 } else {
1314                         dac_width = 8;
1315                 }
1316         }
1317
1318         info->fix.visual = (info->var.bits_per_pixel == 8) ?
1319                                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
1320         info->fix.line_length = mode->bytes_per_scan_line;
1321
1322 out:    if (crtc != NULL)
1323                 kfree(crtc);
1324         uvesafb_free(task);
1325
1326         return err;
1327 }
1328
1329 static void uvesafb_check_limits(struct fb_var_screeninfo *var,
1330                 struct fb_info *info)
1331 {
1332         const struct fb_videomode *mode;
1333         struct uvesafb_par *par = info->par;
1334
1335         /*
1336          * If pixclock is set to 0, then we're using default BIOS timings
1337          * and thus don't have to perform any checks here.
1338          */
1339         if (!var->pixclock)
1340                 return;
1341
1342         if (par->vbe_ib.vbe_version < 0x0300) {
1343                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, var, info);
1344                 return;
1345         }
1346
1347         if (!fb_validate_mode(var, info))
1348                 return;
1349
1350         mode = fb_find_best_mode(var, &info->modelist);
1351         if (mode) {
1352                 if (mode->xres == var->xres && mode->yres == var->yres &&
1353                     !(mode->vmode & (FB_VMODE_INTERLACED | FB_VMODE_DOUBLE))) {
1354                         fb_videomode_to_var(var, mode);
1355                         return;
1356                 }
1357         }
1358
1359         if (info->monspecs.gtf && !fb_get_mode(FB_MAXTIMINGS, 0, var, info))
1360                 return;
1361         /* Use default refresh rate */
1362         var->pixclock = 0;
1363 }
1364
1365 static int uvesafb_check_var(struct fb_var_screeninfo *var,
1366                 struct fb_info *info)
1367 {
1368         struct uvesafb_par *par = info->par;
1369         struct vbe_mode_ib *mode = NULL;
1370         int match = -1;
1371         int depth = var->red.length + var->green.length + var->blue.length;
1372
1373         /*
1374          * Various apps will use bits_per_pixel to set the color depth,
1375          * which is theoretically incorrect, but which we'll try to handle
1376          * here.
1377          */
1378         if (depth == 0 || abs(depth - var->bits_per_pixel) >= 8)
1379                 depth = var->bits_per_pixel;
1380
1381         match = uvesafb_vbe_find_mode(par, var->xres, var->yres, depth,
1382                                                 UVESAFB_EXACT_RES);
1383         if (match == -1)
1384                 return -EINVAL;
1385
1386         mode = &par->vbe_modes[match];
1387         uvesafb_setup_var(var, info, mode);
1388
1389         /*
1390          * Check whether we have remapped enough memory for this mode.
1391          * We might be called at an early stage, when we haven't remapped
1392          * any memory yet, in which case we simply skip the check.
1393          */
1394         if (var->yres * mode->bytes_per_scan_line > info->fix.smem_len
1395                                                 && info->fix.smem_len)
1396                 return -EINVAL;
1397
1398         if ((var->vmode & FB_VMODE_DOUBLE) &&
1399                                 !(par->vbe_modes[match].mode_attr & 0x100))
1400                 var->vmode &= ~FB_VMODE_DOUBLE;
1401
1402         if ((var->vmode & FB_VMODE_INTERLACED) &&
1403                                 !(par->vbe_modes[match].mode_attr & 0x200))
1404                 var->vmode &= ~FB_VMODE_INTERLACED;
1405
1406         uvesafb_check_limits(var, info);
1407
1408         var->xres_virtual = var->xres;
1409         var->yres_virtual = (par->ypan) ?
1410                                 info->fix.smem_len / mode->bytes_per_scan_line :
1411                                 var->yres;
1412         return 0;
1413 }
1414
1415 static struct fb_ops uvesafb_ops = {
1416         .owner          = THIS_MODULE,
1417         .fb_open        = uvesafb_open,
1418         .fb_release     = uvesafb_release,
1419         .fb_setcolreg   = uvesafb_setcolreg,
1420         .fb_setcmap     = uvesafb_setcmap,
1421         .fb_pan_display = uvesafb_pan_display,
1422         .fb_blank       = uvesafb_blank,
1423         .fb_fillrect    = cfb_fillrect,
1424         .fb_copyarea    = cfb_copyarea,
1425         .fb_imageblit   = cfb_imageblit,
1426         .fb_check_var   = uvesafb_check_var,
1427         .fb_set_par     = uvesafb_set_par,
1428 };
1429
1430 static void __devinit uvesafb_init_info(struct fb_info *info,
1431                 struct vbe_mode_ib *mode)
1432 {
1433         unsigned int size_vmode;
1434         unsigned int size_remap;
1435         unsigned int size_total;
1436         struct uvesafb_par *par = info->par;
1437         int i, h;
1438
1439         info->pseudo_palette = ((u8 *)info->par + sizeof(struct uvesafb_par));
1440         info->fix = uvesafb_fix;
1441         info->fix.ypanstep = par->ypan ? 1 : 0;
1442         info->fix.ywrapstep = (par->ypan > 1) ? 1 : 0;
1443
1444         /* Disable blanking if the user requested so. */
1445         if (!blank)
1446                 info->fbops->fb_blank = NULL;
1447
1448         /*
1449          * Find out how much IO memory is required for the mode with
1450          * the highest resolution.
1451          */
1452         size_remap = 0;
1453         for (i = 0; i < par->vbe_modes_cnt; i++) {
1454                 h = par->vbe_modes[i].bytes_per_scan_line *
1455                                         par->vbe_modes[i].y_res;
1456                 if (h > size_remap)
1457                         size_remap = h;
1458         }
1459         size_remap *= 2;
1460
1461         /*
1462          *   size_vmode -- that is the amount of memory needed for the
1463          *                 used video mode, i.e. the minimum amount of
1464          *                 memory we need.
1465          */
1466         if (mode != NULL) {
1467                 size_vmode = info->var.yres * mode->bytes_per_scan_line;
1468         } else {
1469                 size_vmode = info->var.yres * info->var.xres *
1470                              ((info->var.bits_per_pixel + 7) >> 3);
1471         }
1472
1473         /*
1474          *   size_total -- all video memory we have. Used for mtrr
1475          *                 entries, resource allocation and bounds
1476          *                 checking.
1477          */
1478         size_total = par->vbe_ib.total_memory * 65536;
1479         if (vram_total)
1480                 size_total = vram_total * 1024 * 1024;
1481         if (size_total < size_vmode)
1482                 size_total = size_vmode;
1483
1484         /*
1485          *   size_remap -- the amount of video memory we are going to
1486          *                 use for vesafb.  With modern cards it is no
1487          *                 option to simply use size_total as th
1488          *                 wastes plenty of kernel address space.
1489          */
1490         if (vram_remap)
1491                 size_remap = vram_remap * 1024 * 1024;
1492         if (size_remap < size_vmode)
1493                 size_remap = size_vmode;
1494         if (size_remap > size_total)
1495                 size_remap = size_total;
1496
1497         info->fix.smem_len = size_remap;
1498         info->fix.smem_start = mode->phys_base_ptr;
1499
1500         /*
1501          * We have to set yres_virtual here because when setup_var() was
1502          * called, smem_len wasn't defined yet.
1503          */
1504         info->var.yres_virtual = info->fix.smem_len /
1505                                  mode->bytes_per_scan_line;
1506
1507         if (par->ypan && info->var.yres_virtual > info->var.yres) {
1508                 printk(KERN_INFO "uvesafb: scrolling: %s "
1509                         "using protected mode interface, "
1510                         "yres_virtual=%d\n",
1511                         (par->ypan > 1) ? "ywrap" : "ypan",
1512                         info->var.yres_virtual);
1513         } else {
1514                 printk(KERN_INFO "uvesafb: scrolling: redraw\n");
1515                 info->var.yres_virtual = info->var.yres;
1516                 par->ypan = 0;
1517         }
1518
1519         info->flags = FBINFO_FLAG_DEFAULT |
1520                         (par->ypan ? FBINFO_HWACCEL_YPAN : 0);
1521
1522         if (!par->ypan)
1523                 info->fbops->fb_pan_display = NULL;
1524 }
1525
1526 static void __devinit uvesafb_init_mtrr(struct fb_info *info)
1527 {
1528 #ifdef CONFIG_MTRR
1529         if (mtrr && !(info->fix.smem_start & (PAGE_SIZE - 1))) {
1530                 int temp_size = info->fix.smem_len;
1531                 unsigned int type = 0;
1532
1533                 switch (mtrr) {
1534                 case 1:
1535                         type = MTRR_TYPE_UNCACHABLE;
1536                         break;
1537                 case 2:
1538                         type = MTRR_TYPE_WRBACK;
1539                         break;
1540                 case 3:
1541                         type = MTRR_TYPE_WRCOMB;
1542                         break;
1543                 case 4:
1544                         type = MTRR_TYPE_WRTHROUGH;
1545                         break;
1546                 default:
1547                         type = 0;
1548                         break;
1549                 }
1550
1551                 if (type) {
1552                         int rc;
1553
1554                         /* Find the largest power-of-two */
1555                         temp_size = roundup_pow_of_two(temp_size);
1556
1557                         /* Try and find a power of two to add */
1558                         do {
1559                                 rc = mtrr_add(info->fix.smem_start,
1560                                               temp_size, type, 1);
1561                                 temp_size >>= 1;
1562                         } while (temp_size >= PAGE_SIZE && rc == -EINVAL);
1563                 }
1564         }
1565 #endif /* CONFIG_MTRR */
1566 }
1567
1568 static void __devinit uvesafb_ioremap(struct fb_info *info)
1569 {
1570 #ifdef CONFIG_X86
1571         switch (mtrr) {
1572         case 1: /* uncachable */
1573                 info->screen_base = ioremap_nocache(info->fix.smem_start, info->fix.smem_len);
1574                 break;
1575         case 2: /* write-back */
1576                 info->screen_base = ioremap_cache(info->fix.smem_start, info->fix.smem_len);
1577                 break;
1578         case 3: /* write-combining */
1579                 info->screen_base = ioremap_wc(info->fix.smem_start, info->fix.smem_len);
1580                 break;
1581         case 4: /* write-through */
1582         default:
1583                 info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
1584                 break;
1585         }
1586 #else
1587         info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
1588 #endif /* CONFIG_X86 */
1589 }
1590
1591 static ssize_t uvesafb_show_vbe_ver(struct device *dev,
1592                 struct device_attribute *attr, char *buf)
1593 {
1594         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1595         struct uvesafb_par *par = info->par;
1596
1597         return snprintf(buf, PAGE_SIZE, "%.4x\n", par->vbe_ib.vbe_version);
1598 }
1599
1600 static DEVICE_ATTR(vbe_version, S_IRUGO, uvesafb_show_vbe_ver, NULL);
1601
1602 static ssize_t uvesafb_show_vbe_modes(struct device *dev,
1603                 struct device_attribute *attr, char *buf)
1604 {
1605         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1606         struct uvesafb_par *par = info->par;
1607         int ret = 0, i;
1608
1609         for (i = 0; i < par->vbe_modes_cnt && ret < PAGE_SIZE; i++) {
1610                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
1611                         "%dx%d-%d, 0x%.4x\n",
1612                         par->vbe_modes[i].x_res, par->vbe_modes[i].y_res,
1613                         par->vbe_modes[i].depth, par->vbe_modes[i].mode_id);
1614         }
1615
1616         return ret;
1617 }
1618
1619 static DEVICE_ATTR(vbe_modes, S_IRUGO, uvesafb_show_vbe_modes, NULL);
1620
1621 static ssize_t uvesafb_show_vendor(struct device *dev,
1622                 struct device_attribute *attr, char *buf)
1623 {
1624         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1625         struct uvesafb_par *par = info->par;
1626
1627         if (par->vbe_ib.oem_vendor_name_ptr)
1628                 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1629                         (&par->vbe_ib) + par->vbe_ib.oem_vendor_name_ptr);
1630         else
1631                 return 0;
1632 }
1633
1634 static DEVICE_ATTR(oem_vendor, S_IRUGO, uvesafb_show_vendor, NULL);
1635
1636 static ssize_t uvesafb_show_product_name(struct device *dev,
1637                 struct device_attribute *attr, char *buf)
1638 {
1639         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1640         struct uvesafb_par *par = info->par;
1641
1642         if (par->vbe_ib.oem_product_name_ptr)
1643                 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1644                         (&par->vbe_ib) + par->vbe_ib.oem_product_name_ptr);
1645         else
1646                 return 0;
1647 }
1648
1649 static DEVICE_ATTR(oem_product_name, S_IRUGO, uvesafb_show_product_name, NULL);
1650
1651 static ssize_t uvesafb_show_product_rev(struct device *dev,
1652                 struct device_attribute *attr, char *buf)
1653 {
1654         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1655         struct uvesafb_par *par = info->par;
1656
1657         if (par->vbe_ib.oem_product_rev_ptr)
1658                 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1659                         (&par->vbe_ib) + par->vbe_ib.oem_product_rev_ptr);
1660         else
1661                 return 0;
1662 }
1663
1664 static DEVICE_ATTR(oem_product_rev, S_IRUGO, uvesafb_show_product_rev, NULL);
1665
1666 static ssize_t uvesafb_show_oem_string(struct device *dev,
1667                 struct device_attribute *attr, char *buf)
1668 {
1669         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1670         struct uvesafb_par *par = info->par;
1671
1672         if (par->vbe_ib.oem_string_ptr)
1673                 return snprintf(buf, PAGE_SIZE, "%s\n",
1674                         (char *)(&par->vbe_ib) + par->vbe_ib.oem_string_ptr);
1675         else
1676                 return 0;
1677 }
1678
1679 static DEVICE_ATTR(oem_string, S_IRUGO, uvesafb_show_oem_string, NULL);
1680
1681 static ssize_t uvesafb_show_nocrtc(struct device *dev,
1682                 struct device_attribute *attr, char *buf)
1683 {
1684         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1685         struct uvesafb_par *par = info->par;
1686
1687         return snprintf(buf, PAGE_SIZE, "%d\n", par->nocrtc);
1688 }
1689
1690 static ssize_t uvesafb_store_nocrtc(struct device *dev,
1691                 struct device_attribute *attr, const char *buf, size_t count)
1692 {
1693         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1694         struct uvesafb_par *par = info->par;
1695
1696         if (count > 0) {
1697                 if (buf[0] == '0')
1698                         par->nocrtc = 0;
1699                 else
1700                         par->nocrtc = 1;
1701         }
1702         return count;
1703 }
1704
1705 static DEVICE_ATTR(nocrtc, S_IRUGO | S_IWUSR, uvesafb_show_nocrtc,
1706                         uvesafb_store_nocrtc);
1707
1708 static struct attribute *uvesafb_dev_attrs[] = {
1709         &dev_attr_vbe_version.attr,
1710         &dev_attr_vbe_modes.attr,
1711         &dev_attr_oem_vendor.attr,
1712         &dev_attr_oem_product_name.attr,
1713         &dev_attr_oem_product_rev.attr,
1714         &dev_attr_oem_string.attr,
1715         &dev_attr_nocrtc.attr,
1716         NULL,
1717 };
1718
1719 static struct attribute_group uvesafb_dev_attgrp = {
1720         .name = NULL,
1721         .attrs = uvesafb_dev_attrs,
1722 };
1723
1724 static int __devinit uvesafb_probe(struct platform_device *dev)
1725 {
1726         struct fb_info *info;
1727         struct vbe_mode_ib *mode = NULL;
1728         struct uvesafb_par *par;
1729         int err = 0, i;
1730
1731         info = framebuffer_alloc(sizeof(*par) + sizeof(u32) * 256, &dev->dev);
1732         if (!info)
1733                 return -ENOMEM;
1734
1735         par = info->par;
1736
1737         err = uvesafb_vbe_init(info);
1738         if (err) {
1739                 printk(KERN_ERR "uvesafb: vbe_init() failed with %d\n", err);
1740                 goto out;
1741         }
1742
1743         info->fbops = &uvesafb_ops;
1744
1745         i = uvesafb_vbe_init_mode(info);
1746         if (i < 0) {
1747                 err = -EINVAL;
1748                 goto out;
1749         } else {
1750                 mode = &par->vbe_modes[i];
1751         }
1752
1753         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
1754                 err = -ENXIO;
1755                 goto out;
1756         }
1757
1758         uvesafb_init_info(info, mode);
1759
1760         if (!request_region(0x3c0, 32, "uvesafb")) {
1761                 printk(KERN_ERR "uvesafb: request region 0x3c0-0x3e0 failed\n");
1762                 err = -EIO;
1763                 goto out_mode;
1764         }
1765
1766         if (!request_mem_region(info->fix.smem_start, info->fix.smem_len,
1767                                 "uvesafb")) {
1768                 printk(KERN_ERR "uvesafb: cannot reserve video memory at "
1769                                 "0x%lx\n", info->fix.smem_start);
1770                 err = -EIO;
1771                 goto out_reg;
1772         }
1773
1774         uvesafb_init_mtrr(info);
1775         uvesafb_ioremap(info);
1776
1777         if (!info->screen_base) {
1778                 printk(KERN_ERR
1779                         "uvesafb: abort, cannot ioremap 0x%x bytes of video "
1780                         "memory at 0x%lx\n",
1781                         info->fix.smem_len, info->fix.smem_start);
1782                 err = -EIO;
1783                 goto out_mem;
1784         }
1785
1786         platform_set_drvdata(dev, info);
1787
1788         if (register_framebuffer(info) < 0) {
1789                 printk(KERN_ERR
1790                         "uvesafb: failed to register framebuffer device\n");
1791                 err = -EINVAL;
1792                 goto out_unmap;
1793         }
1794
1795         printk(KERN_INFO "uvesafb: framebuffer at 0x%lx, mapped to 0x%p, "
1796                         "using %dk, total %dk\n", info->fix.smem_start,
1797                         info->screen_base, info->fix.smem_len/1024,
1798                         par->vbe_ib.total_memory * 64);
1799         printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
1800                         info->fix.id);
1801
1802         err = sysfs_create_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1803         if (err != 0)
1804                 printk(KERN_WARNING "fb%d: failed to register attributes\n",
1805                         info->node);
1806
1807         return 0;
1808
1809 out_unmap:
1810         iounmap(info->screen_base);
1811 out_mem:
1812         release_mem_region(info->fix.smem_start, info->fix.smem_len);
1813 out_reg:
1814         release_region(0x3c0, 32);
1815 out_mode:
1816         if (!list_empty(&info->modelist))
1817                 fb_destroy_modelist(&info->modelist);
1818         fb_destroy_modedb(info->monspecs.modedb);
1819         fb_dealloc_cmap(&info->cmap);
1820 out:
1821         if (par->vbe_modes)
1822                 kfree(par->vbe_modes);
1823
1824         framebuffer_release(info);
1825         return err;
1826 }
1827
1828 static int uvesafb_remove(struct platform_device *dev)
1829 {
1830         struct fb_info *info = platform_get_drvdata(dev);
1831
1832         if (info) {
1833                 struct uvesafb_par *par = info->par;
1834
1835                 sysfs_remove_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1836                 unregister_framebuffer(info);
1837                 release_region(0x3c0, 32);
1838                 iounmap(info->screen_base);
1839                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1840                 fb_destroy_modedb(info->monspecs.modedb);
1841                 fb_dealloc_cmap(&info->cmap);
1842
1843                 if (par) {
1844                         if (par->vbe_modes)
1845                                 kfree(par->vbe_modes);
1846                         if (par->vbe_state_orig)
1847                                 kfree(par->vbe_state_orig);
1848                         if (par->vbe_state_saved)
1849                                 kfree(par->vbe_state_saved);
1850                 }
1851
1852                 framebuffer_release(info);
1853         }
1854         return 0;
1855 }
1856
1857 static struct platform_driver uvesafb_driver = {
1858         .probe  = uvesafb_probe,
1859         .remove = uvesafb_remove,
1860         .driver = {
1861                 .name = "uvesafb",
1862         },
1863 };
1864
1865 static struct platform_device *uvesafb_device;
1866
1867 #ifndef MODULE
1868 static int __devinit uvesafb_setup(char *options)
1869 {
1870         char *this_opt;
1871
1872         if (!options || !*options)
1873                 return 0;
1874
1875         while ((this_opt = strsep(&options, ",")) != NULL) {
1876                 if (!*this_opt) continue;
1877
1878                 if (!strcmp(this_opt, "redraw"))
1879                         ypan = 0;
1880                 else if (!strcmp(this_opt, "ypan"))
1881                         ypan = 1;
1882                 else if (!strcmp(this_opt, "ywrap"))
1883                         ypan = 2;
1884                 else if (!strcmp(this_opt, "vgapal"))
1885                         pmi_setpal = 0;
1886                 else if (!strcmp(this_opt, "pmipal"))
1887                         pmi_setpal = 1;
1888                 else if (!strncmp(this_opt, "mtrr:", 5))
1889                         mtrr = simple_strtoul(this_opt+5, NULL, 0);
1890                 else if (!strcmp(this_opt, "nomtrr"))
1891                         mtrr = 0;
1892                 else if (!strcmp(this_opt, "nocrtc"))
1893                         nocrtc = 1;
1894                 else if (!strcmp(this_opt, "noedid"))
1895                         noedid = 1;
1896                 else if (!strcmp(this_opt, "noblank"))
1897                         blank = 0;
1898                 else if (!strncmp(this_opt, "vtotal:", 7))
1899                         vram_total = simple_strtoul(this_opt + 7, NULL, 0);
1900                 else if (!strncmp(this_opt, "vremap:", 7))
1901                         vram_remap = simple_strtoul(this_opt + 7, NULL, 0);
1902                 else if (!strncmp(this_opt, "maxhf:", 6))
1903                         maxhf = simple_strtoul(this_opt + 6, NULL, 0);
1904                 else if (!strncmp(this_opt, "maxvf:", 6))
1905                         maxvf = simple_strtoul(this_opt + 6, NULL, 0);
1906                 else if (!strncmp(this_opt, "maxclk:", 7))
1907                         maxclk = simple_strtoul(this_opt + 7, NULL, 0);
1908                 else if (!strncmp(this_opt, "vbemode:", 8))
1909                         vbemode = simple_strtoul(this_opt + 8, NULL, 0);
1910                 else if (this_opt[0] >= '0' && this_opt[0] <= '9') {
1911                         mode_option = this_opt;
1912                 } else {
1913                         printk(KERN_WARNING
1914                                 "uvesafb: unrecognized option %s\n", this_opt);
1915                 }
1916         }
1917
1918         return 0;
1919 }
1920 #endif /* !MODULE */
1921
1922 static ssize_t show_v86d(struct device_driver *dev, char *buf)
1923 {
1924         return snprintf(buf, PAGE_SIZE, "%s\n", v86d_path);
1925 }
1926
1927 static ssize_t store_v86d(struct device_driver *dev, const char *buf,
1928                 size_t count)
1929 {
1930         strncpy(v86d_path, buf, PATH_MAX);
1931         return count;
1932 }
1933
1934 static DRIVER_ATTR(v86d, S_IRUGO | S_IWUSR, show_v86d, store_v86d);
1935
1936 static int __devinit uvesafb_init(void)
1937 {
1938         int err;
1939
1940 #ifndef MODULE
1941         char *option = NULL;
1942
1943         if (fb_get_options("uvesafb", &option))
1944                 return -ENODEV;
1945         uvesafb_setup(option);
1946 #endif
1947         err = cn_add_callback(&uvesafb_cn_id, "uvesafb", uvesafb_cn_callback);
1948         if (err)
1949                 return err;
1950
1951         err = platform_driver_register(&uvesafb_driver);
1952
1953         if (!err) {
1954                 uvesafb_device = platform_device_alloc("uvesafb", 0);
1955                 if (uvesafb_device)
1956                         err = platform_device_add(uvesafb_device);
1957                 else
1958                         err = -ENOMEM;
1959
1960                 if (err) {
1961                         platform_device_put(uvesafb_device);
1962                         platform_driver_unregister(&uvesafb_driver);
1963                         cn_del_callback(&uvesafb_cn_id);
1964                         return err;
1965                 }
1966
1967                 err = driver_create_file(&uvesafb_driver.driver,
1968                                 &driver_attr_v86d);
1969                 if (err) {
1970                         printk(KERN_WARNING "uvesafb: failed to register "
1971                                         "attributes\n");
1972                         err = 0;
1973                 }
1974         }
1975         return err;
1976 }
1977
1978 module_init(uvesafb_init);
1979
1980 static void __devexit uvesafb_exit(void)
1981 {
1982         struct uvesafb_ktask *task;
1983
1984         if (v86d_started) {
1985                 task = uvesafb_prep();
1986                 if (task) {
1987                         task->t.flags = TF_EXIT;
1988                         uvesafb_exec(task);
1989                         uvesafb_free(task);
1990                 }
1991         }
1992
1993         cn_del_callback(&uvesafb_cn_id);
1994         driver_remove_file(&uvesafb_driver.driver, &driver_attr_v86d);
1995         platform_device_unregister(uvesafb_device);
1996         platform_driver_unregister(&uvesafb_driver);
1997 }
1998
1999 module_exit(uvesafb_exit);
2000
2001 static int param_set_scroll(const char *val, const struct kernel_param *kp)
2002 {
2003         ypan = 0;
2004
2005         if (!strcmp(val, "redraw"))
2006                 ypan = 0;
2007         else if (!strcmp(val, "ypan"))
2008                 ypan = 1;
2009         else if (!strcmp(val, "ywrap"))
2010                 ypan = 2;
2011         else
2012                 return -EINVAL;
2013
2014         return 0;
2015 }
2016 static struct kernel_param_ops param_ops_scroll = {
2017         .set = param_set_scroll,
2018 };
2019 #define param_check_scroll(name, p) __param_check(name, p, void)
2020
2021 module_param_named(scroll, ypan, scroll, 0);
2022 MODULE_PARM_DESC(scroll,
2023         "Scrolling mode, set to 'redraw', 'ypan', or 'ywrap'");
2024 module_param_named(vgapal, pmi_setpal, invbool, 0);
2025 MODULE_PARM_DESC(vgapal, "Set palette using VGA registers");
2026 module_param_named(pmipal, pmi_setpal, bool, 0);
2027 MODULE_PARM_DESC(pmipal, "Set palette using PMI calls");
2028 module_param(mtrr, uint, 0);
2029 MODULE_PARM_DESC(mtrr,
2030         "Memory Type Range Registers setting. Use 0 to disable.");
2031 module_param(blank, bool, 0);
2032 MODULE_PARM_DESC(blank, "Enable hardware blanking");
2033 module_param(nocrtc, bool, 0);
2034 MODULE_PARM_DESC(nocrtc, "Ignore CRTC timings when setting modes");
2035 module_param(noedid, bool, 0);
2036 MODULE_PARM_DESC(noedid,
2037         "Ignore EDID-provided monitor limits when setting modes");
2038 module_param(vram_remap, uint, 0);
2039 MODULE_PARM_DESC(vram_remap, "Set amount of video memory to be used [MiB]");
2040 module_param(vram_total, uint, 0);
2041 MODULE_PARM_DESC(vram_total, "Set total amount of video memoery [MiB]");
2042 module_param(maxclk, ushort, 0);
2043 MODULE_PARM_DESC(maxclk, "Maximum pixelclock [MHz], overrides EDID data");
2044 module_param(maxhf, ushort, 0);
2045 MODULE_PARM_DESC(maxhf,
2046         "Maximum horizontal frequency [kHz], overrides EDID data");
2047 module_param(maxvf, ushort, 0);
2048 MODULE_PARM_DESC(maxvf,
2049         "Maximum vertical frequency [Hz], overrides EDID data");
2050 module_param(mode_option, charp, 0);
2051 MODULE_PARM_DESC(mode_option,
2052         "Specify initial video mode as \"<xres>x<yres>[-<bpp>][@<refresh>]\"");
2053 module_param(vbemode, ushort, 0);
2054 MODULE_PARM_DESC(vbemode,
2055         "VBE mode number to set, overrides the 'mode' option");
2056 module_param_string(v86d, v86d_path, PATH_MAX, 0660);
2057 MODULE_PARM_DESC(v86d, "Path to the v86d userspace helper.");
2058
2059 MODULE_LICENSE("GPL");
2060 MODULE_AUTHOR("Michal Januszewski <spock@gentoo.org>");
2061 MODULE_DESCRIPTION("Framebuffer driver for VBE2.0+ compliant graphics boards");
2062