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omap: i2c: add a timeout to the busy waiting
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / video / uvesafb.c
blob7b8839ebf3c402ced009123ac6260c97a51a922a
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(nsp->eff_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 while (temp_size & (temp_size - 1))
1556 temp_size &= (temp_size - 1);
1557
1558 /* Try and find a power of two to add */
1559 do {
1560 rc = mtrr_add(info->fix.smem_start,
1561 temp_size, type, 1);
1562 temp_size >>= 1;
1563 } while (temp_size >= PAGE_SIZE && rc == -EINVAL);
1564 }
1565 }
1566 #endif /* CONFIG_MTRR */
1567 }
1568
1569
1570 static ssize_t uvesafb_show_vbe_ver(struct device *dev,
1571 struct device_attribute *attr, char *buf)
1572 {
1573 struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1574 struct uvesafb_par *par = info->par;
1575
1576 return snprintf(buf, PAGE_SIZE, "%.4x\n", par->vbe_ib.vbe_version);
1577 }
1578
1579 static DEVICE_ATTR(vbe_version, S_IRUGO, uvesafb_show_vbe_ver, NULL);
1580
1581 static ssize_t uvesafb_show_vbe_modes(struct device *dev,
1582 struct device_attribute *attr, char *buf)
1583 {
1584 struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1585 struct uvesafb_par *par = info->par;
1586 int ret = 0, i;
1587
1588 for (i = 0; i < par->vbe_modes_cnt && ret < PAGE_SIZE; i++) {
1589 ret += snprintf(buf + ret, PAGE_SIZE - ret,
1590 "%dx%d-%d, 0x%.4x\n",
1591 par->vbe_modes[i].x_res, par->vbe_modes[i].y_res,
1592 par->vbe_modes[i].depth, par->vbe_modes[i].mode_id);
1593 }
1594
1595 return ret;
1596 }
1597
1598 static DEVICE_ATTR(vbe_modes, S_IRUGO, uvesafb_show_vbe_modes, NULL);
1599
1600 static ssize_t uvesafb_show_vendor(struct device *dev,
1601 struct device_attribute *attr, char *buf)
1602 {
1603 struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1604 struct uvesafb_par *par = info->par;
1605
1606 if (par->vbe_ib.oem_vendor_name_ptr)
1607 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1608 (&par->vbe_ib) + par->vbe_ib.oem_vendor_name_ptr);
1609 else
1610 return 0;
1611 }
1612
1613 static DEVICE_ATTR(oem_vendor, S_IRUGO, uvesafb_show_vendor, NULL);
1614
1615 static ssize_t uvesafb_show_product_name(struct device *dev,
1616 struct device_attribute *attr, char *buf)
1617 {
1618 struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1619 struct uvesafb_par *par = info->par;
1620
1621 if (par->vbe_ib.oem_product_name_ptr)
1622 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1623 (&par->vbe_ib) + par->vbe_ib.oem_product_name_ptr);
1624 else
1625 return 0;
1626 }
1627
1628 static DEVICE_ATTR(oem_product_name, S_IRUGO, uvesafb_show_product_name, NULL);
1629
1630 static ssize_t uvesafb_show_product_rev(struct device *dev,
1631 struct device_attribute *attr, char *buf)
1632 {
1633 struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1634 struct uvesafb_par *par = info->par;
1635
1636 if (par->vbe_ib.oem_product_rev_ptr)
1637 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1638 (&par->vbe_ib) + par->vbe_ib.oem_product_rev_ptr);
1639 else
1640 return 0;
1641 }
1642
1643 static DEVICE_ATTR(oem_product_rev, S_IRUGO, uvesafb_show_product_rev, NULL);
1644
1645 static ssize_t uvesafb_show_oem_string(struct device *dev,
1646 struct device_attribute *attr, char *buf)
1647 {
1648 struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1649 struct uvesafb_par *par = info->par;
1650
1651 if (par->vbe_ib.oem_string_ptr)
1652 return snprintf(buf, PAGE_SIZE, "%s\n",
1653 (char *)(&par->vbe_ib) + par->vbe_ib.oem_string_ptr);
1654 else
1655 return 0;
1656 }
1657
1658 static DEVICE_ATTR(oem_string, S_IRUGO, uvesafb_show_oem_string, NULL);
1659
1660 static ssize_t uvesafb_show_nocrtc(struct device *dev,
1661 struct device_attribute *attr, char *buf)
1662 {
1663 struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1664 struct uvesafb_par *par = info->par;
1665
1666 return snprintf(buf, PAGE_SIZE, "%d\n", par->nocrtc);
1667 }
1668
1669 static ssize_t uvesafb_store_nocrtc(struct device *dev,
1670 struct device_attribute *attr, const char *buf, size_t count)
1671 {
1672 struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1673 struct uvesafb_par *par = info->par;
1674
1675 if (count > 0) {
1676 if (buf[0] == '0')
1677 par->nocrtc = 0;
1678 else
1679 par->nocrtc = 1;
1680 }
1681 return count;
1682 }
1683
1684 static DEVICE_ATTR(nocrtc, S_IRUGO | S_IWUSR, uvesafb_show_nocrtc,
1685 uvesafb_store_nocrtc);
1686
1687 static struct attribute *uvesafb_dev_attrs[] = {
1688 &dev_attr_vbe_version.attr,
1689 &dev_attr_vbe_modes.attr,
1690 &dev_attr_oem_vendor.attr,
1691 &dev_attr_oem_product_name.attr,
1692 &dev_attr_oem_product_rev.attr,
1693 &dev_attr_oem_string.attr,
1694 &dev_attr_nocrtc.attr,
1695 NULL,
1696 };
1697
1698 static struct attribute_group uvesafb_dev_attgrp = {
1699 .name = NULL,
1700 .attrs = uvesafb_dev_attrs,
1701 };
1702
1703 static int __devinit uvesafb_probe(struct platform_device *dev)
1704 {
1705 struct fb_info *info;
1706 struct vbe_mode_ib *mode = NULL;
1707 struct uvesafb_par *par;
1708 int err = 0, i;
1709
1710 info = framebuffer_alloc(sizeof(*par) + sizeof(u32) * 256, &dev->dev);
1711 if (!info)
1712 return -ENOMEM;
1713
1714 par = info->par;
1715
1716 err = uvesafb_vbe_init(info);
1717 if (err) {
1718 printk(KERN_ERR "uvesafb: vbe_init() failed with %d\n", err);
1719 goto out;
1720 }
1721
1722 info->fbops = &uvesafb_ops;
1723
1724 i = uvesafb_vbe_init_mode(info);
1725 if (i < 0) {
1726 err = -EINVAL;
1727 goto out;
1728 } else {
1729 mode = &par->vbe_modes[i];
1730 }
1731
1732 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
1733 err = -ENXIO;
1734 goto out;
1735 }
1736
1737 uvesafb_init_info(info, mode);
1738
1739 if (!request_mem_region(info->fix.smem_start, info->fix.smem_len,
1740 "uvesafb")) {
1741 printk(KERN_ERR "uvesafb: cannot reserve video memory at "
1742 "0x%lx\n", info->fix.smem_start);
1743 err = -EIO;
1744 goto out_mode;
1745 }
1746
1747 info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
1748
1749 if (!info->screen_base) {
1750 printk(KERN_ERR
1751 "uvesafb: abort, cannot ioremap 0x%x bytes of video "
1752 "memory at 0x%lx\n",
1753 info->fix.smem_len, info->fix.smem_start);
1754 err = -EIO;
1755 goto out_mem;
1756 }
1757
1758 if (!request_region(0x3c0, 32, "uvesafb")) {
1759 printk(KERN_ERR "uvesafb: request region 0x3c0-0x3e0 failed\n");
1760 err = -EIO;
1761 goto out_unmap;
1762 }
1763
1764 uvesafb_init_mtrr(info);
1765 platform_set_drvdata(dev, info);
1766
1767 if (register_framebuffer(info) < 0) {
1768 printk(KERN_ERR
1769 "uvesafb: failed to register framebuffer device\n");
1770 err = -EINVAL;
1771 goto out_reg;
1772 }
1773
1774 printk(KERN_INFO "uvesafb: framebuffer at 0x%lx, mapped to 0x%p, "
1775 "using %dk, total %dk\n", info->fix.smem_start,
1776 info->screen_base, info->fix.smem_len/1024,
1777 par->vbe_ib.total_memory * 64);
1778 printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
1779 info->fix.id);
1780
1781 err = sysfs_create_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1782 if (err != 0)
1783 printk(KERN_WARNING "fb%d: failed to register attributes\n",
1784 info->node);
1785
1786 return 0;
1787
1788 out_reg:
1789 release_region(0x3c0, 32);
1790 out_unmap:
1791 iounmap(info->screen_base);
1792 out_mem:
1793 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1794 out_mode:
1795 if (!list_empty(&info->modelist))
1796 fb_destroy_modelist(&info->modelist);
1797 fb_destroy_modedb(info->monspecs.modedb);
1798 fb_dealloc_cmap(&info->cmap);
1799 out:
1800 if (par->vbe_modes)
1801 kfree(par->vbe_modes);
1802
1803 framebuffer_release(info);
1804 return err;
1805 }
1806
1807 static int uvesafb_remove(struct platform_device *dev)
1808 {
1809 struct fb_info *info = platform_get_drvdata(dev);
1810
1811 if (info) {
1812 struct uvesafb_par *par = info->par;
1813
1814 sysfs_remove_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1815 unregister_framebuffer(info);
1816 release_region(0x3c0, 32);
1817 iounmap(info->screen_base);
1818 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1819 fb_destroy_modedb(info->monspecs.modedb);
1820 fb_dealloc_cmap(&info->cmap);
1821
1822 if (par) {
1823 if (par->vbe_modes)
1824 kfree(par->vbe_modes);
1825 if (par->vbe_state_orig)
1826 kfree(par->vbe_state_orig);
1827 if (par->vbe_state_saved)
1828 kfree(par->vbe_state_saved);
1829 }
1830
1831 framebuffer_release(info);
1832 }
1833 return 0;
1834 }
1835
1836 static struct platform_driver uvesafb_driver = {
1837 .probe = uvesafb_probe,
1838 .remove = uvesafb_remove,
1839 .driver = {
1840 .name = "uvesafb",
1841 },
1842 };
1843
1844 static struct platform_device *uvesafb_device;
1845
1846 #ifndef MODULE
1847 static int __devinit uvesafb_setup(char *options)
1848 {
1849 char *this_opt;
1850
1851 if (!options || !*options)
1852 return 0;
1853
1854 while ((this_opt = strsep(&options, ",")) != NULL) {
1855 if (!*this_opt) continue;
1856
1857 if (!strcmp(this_opt, "redraw"))
1858 ypan = 0;
1859 else if (!strcmp(this_opt, "ypan"))
1860 ypan = 1;
1861 else if (!strcmp(this_opt, "ywrap"))
1862 ypan = 2;
1863 else if (!strcmp(this_opt, "vgapal"))
1864 pmi_setpal = 0;
1865 else if (!strcmp(this_opt, "pmipal"))
1866 pmi_setpal = 1;
1867 else if (!strncmp(this_opt, "mtrr:", 5))
1868 mtrr = simple_strtoul(this_opt+5, NULL, 0);
1869 else if (!strcmp(this_opt, "nomtrr"))
1870 mtrr = 0;
1871 else if (!strcmp(this_opt, "nocrtc"))
1872 nocrtc = 1;
1873 else if (!strcmp(this_opt, "noedid"))
1874 noedid = 1;
1875 else if (!strcmp(this_opt, "noblank"))
1876 blank = 0;
1877 else if (!strncmp(this_opt, "vtotal:", 7))
1878 vram_total = simple_strtoul(this_opt + 7, NULL, 0);
1879 else if (!strncmp(this_opt, "vremap:", 7))
1880 vram_remap = simple_strtoul(this_opt + 7, NULL, 0);
1881 else if (!strncmp(this_opt, "maxhf:", 6))
1882 maxhf = simple_strtoul(this_opt + 6, NULL, 0);
1883 else if (!strncmp(this_opt, "maxvf:", 6))
1884 maxvf = simple_strtoul(this_opt + 6, NULL, 0);
1885 else if (!strncmp(this_opt, "maxclk:", 7))
1886 maxclk = simple_strtoul(this_opt + 7, NULL, 0);
1887 else if (!strncmp(this_opt, "vbemode:", 8))
1888 vbemode = simple_strtoul(this_opt + 8, NULL, 0);
1889 else if (this_opt[0] >= '0' && this_opt[0] <= '9') {
1890 mode_option = this_opt;
1891 } else {
1892 printk(KERN_WARNING
1893 "uvesafb: unrecognized option %s\n", this_opt);
1894 }
1895 }
1896
1897 return 0;
1898 }
1899 #endif /* !MODULE */
1900
1901 static ssize_t show_v86d(struct device_driver *dev, char *buf)
1902 {
1903 return snprintf(buf, PAGE_SIZE, "%s\n", v86d_path);
1904 }
1905
1906 static ssize_t store_v86d(struct device_driver *dev, const char *buf,
1907 size_t count)
1908 {
1909 strncpy(v86d_path, buf, PATH_MAX);
1910 return count;
1911 }
1912
1913 static DRIVER_ATTR(v86d, S_IRUGO | S_IWUSR, show_v86d, store_v86d);
1914
1915 static int __devinit uvesafb_init(void)
1916 {
1917 int err;
1918
1919 #ifndef MODULE
1920 char *option = NULL;
1921
1922 if (fb_get_options("uvesafb", &option))
1923 return -ENODEV;
1924 uvesafb_setup(option);
1925 #endif
1926 err = cn_add_callback(&uvesafb_cn_id, "uvesafb", uvesafb_cn_callback);
1927 if (err)
1928 return err;
1929
1930 err = platform_driver_register(&uvesafb_driver);
1931
1932 if (!err) {
1933 uvesafb_device = platform_device_alloc("uvesafb", 0);
1934 if (uvesafb_device)
1935 err = platform_device_add(uvesafb_device);
1936 else
1937 err = -ENOMEM;
1938
1939 if (err) {
1940 platform_device_put(uvesafb_device);
1941 platform_driver_unregister(&uvesafb_driver);
1942 cn_del_callback(&uvesafb_cn_id);
1943 return err;
1944 }
1945
1946 err = driver_create_file(&uvesafb_driver.driver,
1947 &driver_attr_v86d);
1948 if (err) {
1949 printk(KERN_WARNING "uvesafb: failed to register "
1950 "attributes\n");
1951 err = 0;
1952 }
1953 }
1954 return err;
1955 }
1956
1957 module_init(uvesafb_init);
1958
1959 static void __devexit uvesafb_exit(void)
1960 {
1961 struct uvesafb_ktask *task;
1962
1963 if (v86d_started) {
1964 task = uvesafb_prep();
1965 if (task) {
1966 task->t.flags = TF_EXIT;
1967 uvesafb_exec(task);
1968 uvesafb_free(task);
1969 }
1970 }
1971
1972 cn_del_callback(&uvesafb_cn_id);
1973 driver_remove_file(&uvesafb_driver.driver, &driver_attr_v86d);
1974 platform_device_unregister(uvesafb_device);
1975 platform_driver_unregister(&uvesafb_driver);
1976 }
1977
1978 module_exit(uvesafb_exit);
1979
1980 #define param_get_scroll NULL
1981 static int param_set_scroll(const char *val, struct kernel_param *kp)
1982 {
1983 ypan = 0;
1984
1985 if (!strcmp(val, "redraw"))
1986 ypan = 0;
1987 else if (!strcmp(val, "ypan"))
1988 ypan = 1;
1989 else if (!strcmp(val, "ywrap"))
1990 ypan = 2;
1991 else
1992 return -EINVAL;
1993
1994 return 0;
1995 }
1996
1997 #define param_check_scroll(name, p) __param_check(name, p, void)
1998
1999 module_param_named(scroll, ypan, scroll, 0);
2000 MODULE_PARM_DESC(scroll,
2001 "Scrolling mode, set to 'redraw', 'ypan', or 'ywrap'");
2002 module_param_named(vgapal, pmi_setpal, invbool, 0);
2003 MODULE_PARM_DESC(vgapal, "Set palette using VGA registers");
2004 module_param_named(pmipal, pmi_setpal, bool, 0);
2005 MODULE_PARM_DESC(pmipal, "Set palette using PMI calls");
2006 module_param(mtrr, uint, 0);
2007 MODULE_PARM_DESC(mtrr,
2008 "Memory Type Range Registers setting. Use 0 to disable.");
2009 module_param(blank, bool, 0);
2010 MODULE_PARM_DESC(blank, "Enable hardware blanking");
2011 module_param(nocrtc, bool, 0);
2012 MODULE_PARM_DESC(nocrtc, "Ignore CRTC timings when setting modes");
2013 module_param(noedid, bool, 0);
2014 MODULE_PARM_DESC(noedid,
2015 "Ignore EDID-provided monitor limits when setting modes");
2016 module_param(vram_remap, uint, 0);
2017 MODULE_PARM_DESC(vram_remap, "Set amount of video memory to be used [MiB]");
2018 module_param(vram_total, uint, 0);
2019 MODULE_PARM_DESC(vram_total, "Set total amount of video memoery [MiB]");
2020 module_param(maxclk, ushort, 0);
2021 MODULE_PARM_DESC(maxclk, "Maximum pixelclock [MHz], overrides EDID data");
2022 module_param(maxhf, ushort, 0);
2023 MODULE_PARM_DESC(maxhf,
2024 "Maximum horizontal frequency [kHz], overrides EDID data");
2025 module_param(maxvf, ushort, 0);
2026 MODULE_PARM_DESC(maxvf,
2027 "Maximum vertical frequency [Hz], overrides EDID data");
2028 module_param(mode_option, charp, 0);
2029 MODULE_PARM_DESC(mode_option,
2030 "Specify initial video mode as \"<xres>x<yres>[-<bpp>][@<refresh>]\"");
2031 module_param(vbemode, ushort, 0);
2032 MODULE_PARM_DESC(vbemode,
2033 "VBE mode number to set, overrides the 'mode' option");
2034 module_param_string(v86d, v86d_path, PATH_MAX, 0660);
2035 MODULE_PARM_DESC(v86d, "Path to the v86d userspace helper.");
2036
2037 MODULE_LICENSE("GPL");
2038 MODULE_AUTHOR("Michal Januszewski <spock@gentoo.org>");
2039 MODULE_DESCRIPTION("Framebuffer driver for VBE2.0+ compliant graphics boards");
2040
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