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Linux 4.16.11
[linux/fpc-iii.git] / drivers / video / fbdev / smscufx.c
blob8db7085e5d1aa345df4a842f7698c3800d3918ab
1 /*
2 * smscufx.c -- Framebuffer driver for SMSC UFX USB controller
3 *
4 * Copyright (C) 2011 Steve Glendinning <steve.glendinning@shawell.net>
5 * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
6 * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
7 * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
8 *
9 * This file is subject to the terms and conditions of the GNU General Public
10 * License v2. See the file COPYING in the main directory of this archive for
11 * more details.
12 *
13 * Based on udlfb, with work from Florian Echtler, Henrik Bjerregaard Pedersen,
14 * and others.
15 *
16 * Works well with Bernie Thompson's X DAMAGE patch to xf86-video-fbdev
17 * available from http://git.plugable.com
18 *
19 * Layout is based on skeletonfb by James Simmons and Geert Uytterhoeven,
20 * usb-skeleton by GregKH.
21 */
22
23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24
25 #include <linux/module.h>
26 #include <linux/kernel.h>
27 #include <linux/init.h>
28 #include <linux/usb.h>
29 #include <linux/uaccess.h>
30 #include <linux/mm.h>
31 #include <linux/fb.h>
32 #include <linux/vmalloc.h>
33 #include <linux/slab.h>
34 #include <linux/delay.h>
35 #include "edid.h"
36
37 #define check_warn(status, fmt, args...) \
38 ({ if (status < 0) pr_warn(fmt, ##args); })
39
40 #define check_warn_return(status, fmt, args...) \
41 ({ if (status < 0) { pr_warn(fmt, ##args); return status; } })
42
43 #define check_warn_goto_error(status, fmt, args...) \
44 ({ if (status < 0) { pr_warn(fmt, ##args); goto error; } })
45
46 #define all_bits_set(x, bits) (((x) & (bits)) == (bits))
47
48 #define USB_VENDOR_REQUEST_WRITE_REGISTER 0xA0
49 #define USB_VENDOR_REQUEST_READ_REGISTER 0xA1
50
51 /*
52 * TODO: Propose standard fb.h ioctl for reporting damage,
53 * using _IOWR() and one of the existing area structs from fb.h
54 * Consider these ioctls deprecated, but they're still used by the
55 * DisplayLink X server as yet - need both to be modified in tandem
56 * when new ioctl(s) are ready.
57 */
58 #define UFX_IOCTL_RETURN_EDID (0xAD)
59 #define UFX_IOCTL_REPORT_DAMAGE (0xAA)
60
61 /* -BULK_SIZE as per usb-skeleton. Can we get full page and avoid overhead? */
62 #define BULK_SIZE (512)
63 #define MAX_TRANSFER (PAGE_SIZE*16 - BULK_SIZE)
64 #define WRITES_IN_FLIGHT (4)
65
66 #define GET_URB_TIMEOUT (HZ)
67 #define FREE_URB_TIMEOUT (HZ*2)
68
69 #define BPP 2
70
71 #define UFX_DEFIO_WRITE_DELAY 5 /* fb_deferred_io.delay in jiffies */
72 #define UFX_DEFIO_WRITE_DISABLE (HZ*60) /* "disable" with long delay */
73
74 struct dloarea {
75 int x, y;
76 int w, h;
77 };
78
79 struct urb_node {
80 struct list_head entry;
81 struct ufx_data *dev;
82 struct delayed_work release_urb_work;
83 struct urb *urb;
84 };
85
86 struct urb_list {
87 struct list_head list;
88 spinlock_t lock;
89 struct semaphore limit_sem;
90 int available;
91 int count;
92 size_t size;
93 };
94
95 struct ufx_data {
96 struct usb_device *udev;
97 struct device *gdev; /* &udev->dev */
98 struct fb_info *info;
99 struct urb_list urbs;
100 struct kref kref;
101 int fb_count;
102 bool virtualized; /* true when physical usb device not present */
103 struct delayed_work free_framebuffer_work;
104 atomic_t usb_active; /* 0 = update virtual buffer, but no usb traffic */
105 atomic_t lost_pixels; /* 1 = a render op failed. Need screen refresh */
106 u8 *edid; /* null until we read edid from hw or get from sysfs */
107 size_t edid_size;
108 u32 pseudo_palette[256];
109 };
110
111 static struct fb_fix_screeninfo ufx_fix = {
112 .id = "smscufx",
113 .type = FB_TYPE_PACKED_PIXELS,
114 .visual = FB_VISUAL_TRUECOLOR,
115 .xpanstep = 0,
116 .ypanstep = 0,
117 .ywrapstep = 0,
118 .accel = FB_ACCEL_NONE,
119 };
120
121 static const u32 smscufx_info_flags = FBINFO_DEFAULT | FBINFO_READS_FAST |
122 FBINFO_VIRTFB | FBINFO_HWACCEL_IMAGEBLIT | FBINFO_HWACCEL_FILLRECT |
123 FBINFO_HWACCEL_COPYAREA | FBINFO_MISC_ALWAYS_SETPAR;
124
125 static const struct usb_device_id id_table[] = {
126 {USB_DEVICE(0x0424, 0x9d00),},
127 {USB_DEVICE(0x0424, 0x9d01),},
128 {},
129 };
130 MODULE_DEVICE_TABLE(usb, id_table);
131
132 /* module options */
133 static bool console; /* Optionally allow fbcon to consume first framebuffer */
134 static bool fb_defio = true; /* Optionally enable fb_defio mmap support */
135
136 /* ufx keeps a list of urbs for efficient bulk transfers */
137 static void ufx_urb_completion(struct urb *urb);
138 static struct urb *ufx_get_urb(struct ufx_data *dev);
139 static int ufx_submit_urb(struct ufx_data *dev, struct urb * urb, size_t len);
140 static int ufx_alloc_urb_list(struct ufx_data *dev, int count, size_t size);
141 static void ufx_free_urb_list(struct ufx_data *dev);
142
143 /* reads a control register */
144 static int ufx_reg_read(struct ufx_data *dev, u32 index, u32 *data)
145 {
146 u32 *buf = kmalloc(4, GFP_KERNEL);
147 int ret;
148
149 BUG_ON(!dev);
150
151 if (!buf)
152 return -ENOMEM;
153
154 ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
155 USB_VENDOR_REQUEST_READ_REGISTER,
156 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
157 00, index, buf, 4, USB_CTRL_GET_TIMEOUT);
158
159 le32_to_cpus(buf);
160 *data = *buf;
161 kfree(buf);
162
163 if (unlikely(ret < 0))
164 pr_warn("Failed to read register index 0x%08x\n", index);
165
166 return ret;
167 }
168
169 /* writes a control register */
170 static int ufx_reg_write(struct ufx_data *dev, u32 index, u32 data)
171 {
172 u32 *buf = kmalloc(4, GFP_KERNEL);
173 int ret;
174
175 BUG_ON(!dev);
176
177 if (!buf)
178 return -ENOMEM;
179
180 *buf = data;
181 cpu_to_le32s(buf);
182
183 ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
184 USB_VENDOR_REQUEST_WRITE_REGISTER,
185 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
186 00, index, buf, 4, USB_CTRL_SET_TIMEOUT);
187
188 kfree(buf);
189
190 if (unlikely(ret < 0))
191 pr_warn("Failed to write register index 0x%08x with value "
192 "0x%08x\n", index, data);
193
194 return ret;
195 }
196
197 static int ufx_reg_clear_and_set_bits(struct ufx_data *dev, u32 index,
198 u32 bits_to_clear, u32 bits_to_set)
199 {
200 u32 data;
201 int status = ufx_reg_read(dev, index, &data);
202 check_warn_return(status, "ufx_reg_clear_and_set_bits error reading "
203 "0x%x", index);
204
205 data &= (~bits_to_clear);
206 data |= bits_to_set;
207
208 status = ufx_reg_write(dev, index, data);
209 check_warn_return(status, "ufx_reg_clear_and_set_bits error writing "
210 "0x%x", index);
211
212 return 0;
213 }
214
215 static int ufx_reg_set_bits(struct ufx_data *dev, u32 index, u32 bits)
216 {
217 return ufx_reg_clear_and_set_bits(dev, index, 0, bits);
218 }
219
220 static int ufx_reg_clear_bits(struct ufx_data *dev, u32 index, u32 bits)
221 {
222 return ufx_reg_clear_and_set_bits(dev, index, bits, 0);
223 }
224
225 static int ufx_lite_reset(struct ufx_data *dev)
226 {
227 int status;
228 u32 value;
229
230 status = ufx_reg_write(dev, 0x3008, 0x00000001);
231 check_warn_return(status, "ufx_lite_reset error writing 0x3008");
232
233 status = ufx_reg_read(dev, 0x3008, &value);
234 check_warn_return(status, "ufx_lite_reset error reading 0x3008");
235
236 return (value == 0) ? 0 : -EIO;
237 }
238
239 /* If display is unblanked, then blank it */
240 static int ufx_blank(struct ufx_data *dev, bool wait)
241 {
242 u32 dc_ctrl, dc_sts;
243 int i;
244
245 int status = ufx_reg_read(dev, 0x2004, &dc_sts);
246 check_warn_return(status, "ufx_blank error reading 0x2004");
247
248 status = ufx_reg_read(dev, 0x2000, &dc_ctrl);
249 check_warn_return(status, "ufx_blank error reading 0x2000");
250
251 /* return success if display is already blanked */
252 if ((dc_sts & 0x00000100) || (dc_ctrl & 0x00000100))
253 return 0;
254
255 /* request the DC to blank the display */
256 dc_ctrl |= 0x00000100;
257 status = ufx_reg_write(dev, 0x2000, dc_ctrl);
258 check_warn_return(status, "ufx_blank error writing 0x2000");
259
260 /* return success immediately if we don't have to wait */
261 if (!wait)
262 return 0;
263
264 for (i = 0; i < 250; i++) {
265 status = ufx_reg_read(dev, 0x2004, &dc_sts);
266 check_warn_return(status, "ufx_blank error reading 0x2004");
267
268 if (dc_sts & 0x00000100)
269 return 0;
270 }
271
272 /* timed out waiting for display to blank */
273 return -EIO;
274 }
275
276 /* If display is blanked, then unblank it */
277 static int ufx_unblank(struct ufx_data *dev, bool wait)
278 {
279 u32 dc_ctrl, dc_sts;
280 int i;
281
282 int status = ufx_reg_read(dev, 0x2004, &dc_sts);
283 check_warn_return(status, "ufx_unblank error reading 0x2004");
284
285 status = ufx_reg_read(dev, 0x2000, &dc_ctrl);
286 check_warn_return(status, "ufx_unblank error reading 0x2000");
287
288 /* return success if display is already unblanked */
289 if (((dc_sts & 0x00000100) == 0) || ((dc_ctrl & 0x00000100) == 0))
290 return 0;
291
292 /* request the DC to unblank the display */
293 dc_ctrl &= ~0x00000100;
294 status = ufx_reg_write(dev, 0x2000, dc_ctrl);
295 check_warn_return(status, "ufx_unblank error writing 0x2000");
296
297 /* return success immediately if we don't have to wait */
298 if (!wait)
299 return 0;
300
301 for (i = 0; i < 250; i++) {
302 status = ufx_reg_read(dev, 0x2004, &dc_sts);
303 check_warn_return(status, "ufx_unblank error reading 0x2004");
304
305 if ((dc_sts & 0x00000100) == 0)
306 return 0;
307 }
308
309 /* timed out waiting for display to unblank */
310 return -EIO;
311 }
312
313 /* If display is enabled, then disable it */
314 static int ufx_disable(struct ufx_data *dev, bool wait)
315 {
316 u32 dc_ctrl, dc_sts;
317 int i;
318
319 int status = ufx_reg_read(dev, 0x2004, &dc_sts);
320 check_warn_return(status, "ufx_disable error reading 0x2004");
321
322 status = ufx_reg_read(dev, 0x2000, &dc_ctrl);
323 check_warn_return(status, "ufx_disable error reading 0x2000");
324
325 /* return success if display is already disabled */
326 if (((dc_sts & 0x00000001) == 0) || ((dc_ctrl & 0x00000001) == 0))
327 return 0;
328
329 /* request the DC to disable the display */
330 dc_ctrl &= ~(0x00000001);
331 status = ufx_reg_write(dev, 0x2000, dc_ctrl);
332 check_warn_return(status, "ufx_disable error writing 0x2000");
333
334 /* return success immediately if we don't have to wait */
335 if (!wait)
336 return 0;
337
338 for (i = 0; i < 250; i++) {
339 status = ufx_reg_read(dev, 0x2004, &dc_sts);
340 check_warn_return(status, "ufx_disable error reading 0x2004");
341
342 if ((dc_sts & 0x00000001) == 0)
343 return 0;
344 }
345
346 /* timed out waiting for display to disable */
347 return -EIO;
348 }
349
350 /* If display is disabled, then enable it */
351 static int ufx_enable(struct ufx_data *dev, bool wait)
352 {
353 u32 dc_ctrl, dc_sts;
354 int i;
355
356 int status = ufx_reg_read(dev, 0x2004, &dc_sts);
357 check_warn_return(status, "ufx_enable error reading 0x2004");
358
359 status = ufx_reg_read(dev, 0x2000, &dc_ctrl);
360 check_warn_return(status, "ufx_enable error reading 0x2000");
361
362 /* return success if display is already enabled */
363 if ((dc_sts & 0x00000001) || (dc_ctrl & 0x00000001))
364 return 0;
365
366 /* request the DC to enable the display */
367 dc_ctrl |= 0x00000001;
368 status = ufx_reg_write(dev, 0x2000, dc_ctrl);
369 check_warn_return(status, "ufx_enable error writing 0x2000");
370
371 /* return success immediately if we don't have to wait */
372 if (!wait)
373 return 0;
374
375 for (i = 0; i < 250; i++) {
376 status = ufx_reg_read(dev, 0x2004, &dc_sts);
377 check_warn_return(status, "ufx_enable error reading 0x2004");
378
379 if (dc_sts & 0x00000001)
380 return 0;
381 }
382
383 /* timed out waiting for display to enable */
384 return -EIO;
385 }
386
387 static int ufx_config_sys_clk(struct ufx_data *dev)
388 {
389 int status = ufx_reg_write(dev, 0x700C, 0x8000000F);
390 check_warn_return(status, "error writing 0x700C");
391
392 status = ufx_reg_write(dev, 0x7014, 0x0010024F);
393 check_warn_return(status, "error writing 0x7014");
394
395 status = ufx_reg_write(dev, 0x7010, 0x00000000);
396 check_warn_return(status, "error writing 0x7010");
397
398 status = ufx_reg_clear_bits(dev, 0x700C, 0x0000000A);
399 check_warn_return(status, "error clearing PLL1 bypass in 0x700C");
400 msleep(1);
401
402 status = ufx_reg_clear_bits(dev, 0x700C, 0x80000000);
403 check_warn_return(status, "error clearing output gate in 0x700C");
404
405 return 0;
406 }
407
408 static int ufx_config_ddr2(struct ufx_data *dev)
409 {
410 int status, i = 0;
411 u32 tmp;
412
413 status = ufx_reg_write(dev, 0x0004, 0x001F0F77);
414 check_warn_return(status, "error writing 0x0004");
415
416 status = ufx_reg_write(dev, 0x0008, 0xFFF00000);
417 check_warn_return(status, "error writing 0x0008");
418
419 status = ufx_reg_write(dev, 0x000C, 0x0FFF2222);
420 check_warn_return(status, "error writing 0x000C");
421
422 status = ufx_reg_write(dev, 0x0010, 0x00030814);
423 check_warn_return(status, "error writing 0x0010");
424
425 status = ufx_reg_write(dev, 0x0014, 0x00500019);
426 check_warn_return(status, "error writing 0x0014");
427
428 status = ufx_reg_write(dev, 0x0018, 0x020D0F15);
429 check_warn_return(status, "error writing 0x0018");
430
431 status = ufx_reg_write(dev, 0x001C, 0x02532305);
432 check_warn_return(status, "error writing 0x001C");
433
434 status = ufx_reg_write(dev, 0x0020, 0x0B030905);
435 check_warn_return(status, "error writing 0x0020");
436
437 status = ufx_reg_write(dev, 0x0024, 0x00000827);
438 check_warn_return(status, "error writing 0x0024");
439
440 status = ufx_reg_write(dev, 0x0028, 0x00000000);
441 check_warn_return(status, "error writing 0x0028");
442
443 status = ufx_reg_write(dev, 0x002C, 0x00000042);
444 check_warn_return(status, "error writing 0x002C");
445
446 status = ufx_reg_write(dev, 0x0030, 0x09520000);
447 check_warn_return(status, "error writing 0x0030");
448
449 status = ufx_reg_write(dev, 0x0034, 0x02223314);
450 check_warn_return(status, "error writing 0x0034");
451
452 status = ufx_reg_write(dev, 0x0038, 0x00430043);
453 check_warn_return(status, "error writing 0x0038");
454
455 status = ufx_reg_write(dev, 0x003C, 0xF00F000F);
456 check_warn_return(status, "error writing 0x003C");
457
458 status = ufx_reg_write(dev, 0x0040, 0xF380F00F);
459 check_warn_return(status, "error writing 0x0040");
460
461 status = ufx_reg_write(dev, 0x0044, 0xF00F0496);
462 check_warn_return(status, "error writing 0x0044");
463
464 status = ufx_reg_write(dev, 0x0048, 0x03080406);
465 check_warn_return(status, "error writing 0x0048");
466
467 status = ufx_reg_write(dev, 0x004C, 0x00001000);
468 check_warn_return(status, "error writing 0x004C");
469
470 status = ufx_reg_write(dev, 0x005C, 0x00000007);
471 check_warn_return(status, "error writing 0x005C");
472
473 status = ufx_reg_write(dev, 0x0100, 0x54F00012);
474 check_warn_return(status, "error writing 0x0100");
475
476 status = ufx_reg_write(dev, 0x0104, 0x00004012);
477 check_warn_return(status, "error writing 0x0104");
478
479 status = ufx_reg_write(dev, 0x0118, 0x40404040);
480 check_warn_return(status, "error writing 0x0118");
481
482 status = ufx_reg_write(dev, 0x0000, 0x00000001);
483 check_warn_return(status, "error writing 0x0000");
484
485 while (i++ < 500) {
486 status = ufx_reg_read(dev, 0x0000, &tmp);
487 check_warn_return(status, "error reading 0x0000");
488
489 if (all_bits_set(tmp, 0xC0000000))
490 return 0;
491 }
492
493 pr_err("DDR2 initialisation timed out, reg 0x0000=0x%08x", tmp);
494 return -ETIMEDOUT;
495 }
496
497 struct pll_values {
498 u32 div_r0;
499 u32 div_f0;
500 u32 div_q0;
501 u32 range0;
502 u32 div_r1;
503 u32 div_f1;
504 u32 div_q1;
505 u32 range1;
506 };
507
508 static u32 ufx_calc_range(u32 ref_freq)
509 {
510 if (ref_freq >= 88000000)
511 return 7;
512
513 if (ref_freq >= 54000000)
514 return 6;
515
516 if (ref_freq >= 34000000)
517 return 5;
518
519 if (ref_freq >= 21000000)
520 return 4;
521
522 if (ref_freq >= 13000000)
523 return 3;
524
525 if (ref_freq >= 8000000)
526 return 2;
527
528 return 1;
529 }
530
531 /* calculates PLL divider settings for a desired target frequency */
532 static void ufx_calc_pll_values(const u32 clk_pixel_pll, struct pll_values *asic_pll)
533 {
534 const u32 ref_clk = 25000000;
535 u32 div_r0, div_f0, div_q0, div_r1, div_f1, div_q1;
536 u32 min_error = clk_pixel_pll;
537
538 for (div_r0 = 1; div_r0 <= 32; div_r0++) {
539 u32 ref_freq0 = ref_clk / div_r0;
540 if (ref_freq0 < 5000000)
541 break;
542
543 if (ref_freq0 > 200000000)
544 continue;
545
546 for (div_f0 = 1; div_f0 <= 256; div_f0++) {
547 u32 vco_freq0 = ref_freq0 * div_f0;
548
549 if (vco_freq0 < 350000000)
550 continue;
551
552 if (vco_freq0 > 700000000)
553 break;
554
555 for (div_q0 = 0; div_q0 < 7; div_q0++) {
556 u32 pllout_freq0 = vco_freq0 / (1 << div_q0);
557
558 if (pllout_freq0 < 5000000)
559 break;
560
561 if (pllout_freq0 > 200000000)
562 continue;
563
564 for (div_r1 = 1; div_r1 <= 32; div_r1++) {
565 u32 ref_freq1 = pllout_freq0 / div_r1;
566
567 if (ref_freq1 < 5000000)
568 break;
569
570 for (div_f1 = 1; div_f1 <= 256; div_f1++) {
571 u32 vco_freq1 = ref_freq1 * div_f1;
572
573 if (vco_freq1 < 350000000)
574 continue;
575
576 if (vco_freq1 > 700000000)
577 break;
578
579 for (div_q1 = 0; div_q1 < 7; div_q1++) {
580 u32 pllout_freq1 = vco_freq1 / (1 << div_q1);
581 int error = abs(pllout_freq1 - clk_pixel_pll);
582
583 if (pllout_freq1 < 5000000)
584 break;
585
586 if (pllout_freq1 > 700000000)
587 continue;
588
589 if (error < min_error) {
590 min_error = error;
591
592 /* final returned value is equal to calculated value - 1
593 * because a value of 0 = divide by 1 */
594 asic_pll->div_r0 = div_r0 - 1;
595 asic_pll->div_f0 = div_f0 - 1;
596 asic_pll->div_q0 = div_q0;
597 asic_pll->div_r1 = div_r1 - 1;
598 asic_pll->div_f1 = div_f1 - 1;
599 asic_pll->div_q1 = div_q1;
600
601 asic_pll->range0 = ufx_calc_range(ref_freq0);
602 asic_pll->range1 = ufx_calc_range(ref_freq1);
603
604 if (min_error == 0)
605 return;
606 }
607 }
608 }
609 }
610 }
611 }
612 }
613 }
614
615 /* sets analog bit PLL configuration values */
616 static int ufx_config_pix_clk(struct ufx_data *dev, u32 pixclock)
617 {
618 struct pll_values asic_pll = {0};
619 u32 value, clk_pixel, clk_pixel_pll;
620 int status;
621
622 /* convert pixclock (in ps) to frequency (in Hz) */
623 clk_pixel = PICOS2KHZ(pixclock) * 1000;
624 pr_debug("pixclock %d ps = clk_pixel %d Hz", pixclock, clk_pixel);
625
626 /* clk_pixel = 1/2 clk_pixel_pll */
627 clk_pixel_pll = clk_pixel * 2;
628
629 ufx_calc_pll_values(clk_pixel_pll, &asic_pll);
630
631 /* Keep BYPASS and RESET signals asserted until configured */
632 status = ufx_reg_write(dev, 0x7000, 0x8000000F);
633 check_warn_return(status, "error writing 0x7000");
634
635 value = (asic_pll.div_f1 | (asic_pll.div_r1 << 8) |
636 (asic_pll.div_q1 << 16) | (asic_pll.range1 << 20));
637 status = ufx_reg_write(dev, 0x7008, value);
638 check_warn_return(status, "error writing 0x7008");
639
640 value = (asic_pll.div_f0 | (asic_pll.div_r0 << 8) |
641 (asic_pll.div_q0 << 16) | (asic_pll.range0 << 20));
642 status = ufx_reg_write(dev, 0x7004, value);
643 check_warn_return(status, "error writing 0x7004");
644
645 status = ufx_reg_clear_bits(dev, 0x7000, 0x00000005);
646 check_warn_return(status,
647 "error clearing PLL0 bypass bits in 0x7000");
648 msleep(1);
649
650 status = ufx_reg_clear_bits(dev, 0x7000, 0x0000000A);
651 check_warn_return(status,
652 "error clearing PLL1 bypass bits in 0x7000");
653 msleep(1);
654
655 status = ufx_reg_clear_bits(dev, 0x7000, 0x80000000);
656 check_warn_return(status, "error clearing gate bits in 0x7000");
657
658 return 0;
659 }
660
661 static int ufx_set_vid_mode(struct ufx_data *dev, struct fb_var_screeninfo *var)
662 {
663 u32 temp;
664 u16 h_total, h_active, h_blank_start, h_blank_end, h_sync_start, h_sync_end;
665 u16 v_total, v_active, v_blank_start, v_blank_end, v_sync_start, v_sync_end;
666
667 int status = ufx_reg_write(dev, 0x8028, 0);
668 check_warn_return(status, "ufx_set_vid_mode error disabling RGB pad");
669
670 status = ufx_reg_write(dev, 0x8024, 0);
671 check_warn_return(status, "ufx_set_vid_mode error disabling VDAC");
672
673 /* shut everything down before changing timing */
674 status = ufx_blank(dev, true);
675 check_warn_return(status, "ufx_set_vid_mode error blanking display");
676
677 status = ufx_disable(dev, true);
678 check_warn_return(status, "ufx_set_vid_mode error disabling display");
679
680 status = ufx_config_pix_clk(dev, var->pixclock);
681 check_warn_return(status, "ufx_set_vid_mode error configuring pixclock");
682
683 status = ufx_reg_write(dev, 0x2000, 0x00000104);
684 check_warn_return(status, "ufx_set_vid_mode error writing 0x2000");
685
686 /* set horizontal timings */
687 h_total = var->xres + var->right_margin + var->hsync_len + var->left_margin;
688 h_active = var->xres;
689 h_blank_start = var->xres + var->right_margin;
690 h_blank_end = var->xres + var->right_margin + var->hsync_len;
691 h_sync_start = var->xres + var->right_margin;
692 h_sync_end = var->xres + var->right_margin + var->hsync_len;
693
694 temp = ((h_total - 1) << 16) | (h_active - 1);
695 status = ufx_reg_write(dev, 0x2008, temp);
696 check_warn_return(status, "ufx_set_vid_mode error writing 0x2008");
697
698 temp = ((h_blank_start - 1) << 16) | (h_blank_end - 1);
699 status = ufx_reg_write(dev, 0x200C, temp);
700 check_warn_return(status, "ufx_set_vid_mode error writing 0x200C");
701
702 temp = ((h_sync_start - 1) << 16) | (h_sync_end - 1);
703 status = ufx_reg_write(dev, 0x2010, temp);
704 check_warn_return(status, "ufx_set_vid_mode error writing 0x2010");
705
706 /* set vertical timings */
707 v_total = var->upper_margin + var->yres + var->lower_margin + var->vsync_len;
708 v_active = var->yres;
709 v_blank_start = var->yres + var->lower_margin;
710 v_blank_end = var->yres + var->lower_margin + var->vsync_len;
711 v_sync_start = var->yres + var->lower_margin;
712 v_sync_end = var->yres + var->lower_margin + var->vsync_len;
713
714 temp = ((v_total - 1) << 16) | (v_active - 1);
715 status = ufx_reg_write(dev, 0x2014, temp);
716 check_warn_return(status, "ufx_set_vid_mode error writing 0x2014");
717
718 temp = ((v_blank_start - 1) << 16) | (v_blank_end - 1);
719 status = ufx_reg_write(dev, 0x2018, temp);
720 check_warn_return(status, "ufx_set_vid_mode error writing 0x2018");
721
722 temp = ((v_sync_start - 1) << 16) | (v_sync_end - 1);
723 status = ufx_reg_write(dev, 0x201C, temp);
724 check_warn_return(status, "ufx_set_vid_mode error writing 0x201C");
725
726 status = ufx_reg_write(dev, 0x2020, 0x00000000);
727 check_warn_return(status, "ufx_set_vid_mode error writing 0x2020");
728
729 status = ufx_reg_write(dev, 0x2024, 0x00000000);
730 check_warn_return(status, "ufx_set_vid_mode error writing 0x2024");
731
732 /* Set the frame length register (#pix * 2 bytes/pixel) */
733 temp = var->xres * var->yres * 2;
734 temp = (temp + 7) & (~0x7);
735 status = ufx_reg_write(dev, 0x2028, temp);
736 check_warn_return(status, "ufx_set_vid_mode error writing 0x2028");
737
738 /* enable desired output interface & disable others */
739 status = ufx_reg_write(dev, 0x2040, 0);
740 check_warn_return(status, "ufx_set_vid_mode error writing 0x2040");
741
742 status = ufx_reg_write(dev, 0x2044, 0);
743 check_warn_return(status, "ufx_set_vid_mode error writing 0x2044");
744
745 status = ufx_reg_write(dev, 0x2048, 0);
746 check_warn_return(status, "ufx_set_vid_mode error writing 0x2048");
747
748 /* set the sync polarities & enable bit */
749 temp = 0x00000001;
750 if (var->sync & FB_SYNC_HOR_HIGH_ACT)
751 temp |= 0x00000010;
752
753 if (var->sync & FB_SYNC_VERT_HIGH_ACT)
754 temp |= 0x00000008;
755
756 status = ufx_reg_write(dev, 0x2040, temp);
757 check_warn_return(status, "ufx_set_vid_mode error writing 0x2040");
758
759 /* start everything back up */
760 status = ufx_enable(dev, true);
761 check_warn_return(status, "ufx_set_vid_mode error enabling display");
762
763 /* Unblank the display */
764 status = ufx_unblank(dev, true);
765 check_warn_return(status, "ufx_set_vid_mode error unblanking display");
766
767 /* enable RGB pad */
768 status = ufx_reg_write(dev, 0x8028, 0x00000003);
769 check_warn_return(status, "ufx_set_vid_mode error enabling RGB pad");
770
771 /* enable VDAC */
772 status = ufx_reg_write(dev, 0x8024, 0x00000007);
773 check_warn_return(status, "ufx_set_vid_mode error enabling VDAC");
774
775 return 0;
776 }
777
778 static int ufx_ops_mmap(struct fb_info *info, struct vm_area_struct *vma)
779 {
780 unsigned long start = vma->vm_start;
781 unsigned long size = vma->vm_end - vma->vm_start;
782 unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
783 unsigned long page, pos;
784
785 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
786 return -EINVAL;
787 if (size > info->fix.smem_len)
788 return -EINVAL;
789 if (offset > info->fix.smem_len - size)
790 return -EINVAL;
791
792 pos = (unsigned long)info->fix.smem_start + offset;
793
794 pr_debug("mmap() framebuffer addr:%lu size:%lu\n",
795 pos, size);
796
797 while (size > 0) {
798 page = vmalloc_to_pfn((void *)pos);
799 if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
800 return -EAGAIN;
801
802 start += PAGE_SIZE;
803 pos += PAGE_SIZE;
804 if (size > PAGE_SIZE)
805 size -= PAGE_SIZE;
806 else
807 size = 0;
808 }
809
810 return 0;
811 }
812
813 static void ufx_raw_rect(struct ufx_data *dev, u16 *cmd, int x, int y,
814 int width, int height)
815 {
816 size_t packed_line_len = ALIGN((width * 2), 4);
817 size_t packed_rect_len = packed_line_len * height;
818 int line;
819
820 BUG_ON(!dev);
821 BUG_ON(!dev->info);
822
823 /* command word */
824 *((u32 *)&cmd[0]) = cpu_to_le32(0x01);
825
826 /* length word */
827 *((u32 *)&cmd[2]) = cpu_to_le32(packed_rect_len + 16);
828
829 cmd[4] = cpu_to_le16(x);
830 cmd[5] = cpu_to_le16(y);
831 cmd[6] = cpu_to_le16(width);
832 cmd[7] = cpu_to_le16(height);
833
834 /* frame base address */
835 *((u32 *)&cmd[8]) = cpu_to_le32(0);
836
837 /* color mode and horizontal resolution */
838 cmd[10] = cpu_to_le16(0x4000 | dev->info->var.xres);
839
840 /* vertical resolution */
841 cmd[11] = cpu_to_le16(dev->info->var.yres);
842
843 /* packed data */
844 for (line = 0; line < height; line++) {
845 const int line_offset = dev->info->fix.line_length * (y + line);
846 const int byte_offset = line_offset + (x * BPP);
847 memcpy(&cmd[(24 + (packed_line_len * line)) / 2],
848 (char *)dev->info->fix.smem_start + byte_offset, width * BPP);
849 }
850 }
851
852 static int ufx_handle_damage(struct ufx_data *dev, int x, int y,
853 int width, int height)
854 {
855 size_t packed_line_len = ALIGN((width * 2), 4);
856 int len, status, urb_lines, start_line = 0;
857
858 if ((width <= 0) || (height <= 0) ||
859 (x + width > dev->info->var.xres) ||
860 (y + height > dev->info->var.yres))
861 return -EINVAL;
862
863 if (!atomic_read(&dev->usb_active))
864 return 0;
865
866 while (start_line < height) {
867 struct urb *urb = ufx_get_urb(dev);
868 if (!urb) {
869 pr_warn("ufx_handle_damage unable to get urb");
870 return 0;
871 }
872
873 /* assume we have enough space to transfer at least one line */
874 BUG_ON(urb->transfer_buffer_length < (24 + (width * 2)));
875
876 /* calculate the maximum number of lines we could fit in */
877 urb_lines = (urb->transfer_buffer_length - 24) / packed_line_len;
878
879 /* but we might not need this many */
880 urb_lines = min(urb_lines, (height - start_line));
881
882 memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
883
884 ufx_raw_rect(dev, urb->transfer_buffer, x, (y + start_line), width, urb_lines);
885 len = 24 + (packed_line_len * urb_lines);
886
887 status = ufx_submit_urb(dev, urb, len);
888 check_warn_return(status, "Error submitting URB");
889
890 start_line += urb_lines;
891 }
892
893 return 0;
894 }
895
896 /* Path triggered by usermode clients who write to filesystem
897 * e.g. cat filename > /dev/fb1
898 * Not used by X Windows or text-mode console. But useful for testing.
899 * Slow because of extra copy and we must assume all pixels dirty. */
900 static ssize_t ufx_ops_write(struct fb_info *info, const char __user *buf,
901 size_t count, loff_t *ppos)
902 {
903 ssize_t result;
904 struct ufx_data *dev = info->par;
905 u32 offset = (u32) *ppos;
906
907 result = fb_sys_write(info, buf, count, ppos);
908
909 if (result > 0) {
910 int start = max((int)(offset / info->fix.line_length), 0);
911 int lines = min((u32)((result / info->fix.line_length) + 1),
912 (u32)info->var.yres);
913
914 ufx_handle_damage(dev, 0, start, info->var.xres, lines);
915 }
916
917 return result;
918 }
919
920 static void ufx_ops_copyarea(struct fb_info *info,
921 const struct fb_copyarea *area)
922 {
923
924 struct ufx_data *dev = info->par;
925
926 sys_copyarea(info, area);
927
928 ufx_handle_damage(dev, area->dx, area->dy,
929 area->width, area->height);
930 }
931
932 static void ufx_ops_imageblit(struct fb_info *info,
933 const struct fb_image *image)
934 {
935 struct ufx_data *dev = info->par;
936
937 sys_imageblit(info, image);
938
939 ufx_handle_damage(dev, image->dx, image->dy,
940 image->width, image->height);
941 }
942
943 static void ufx_ops_fillrect(struct fb_info *info,
944 const struct fb_fillrect *rect)
945 {
946 struct ufx_data *dev = info->par;
947
948 sys_fillrect(info, rect);
949
950 ufx_handle_damage(dev, rect->dx, rect->dy, rect->width,
951 rect->height);
952 }
953
954 /* NOTE: fb_defio.c is holding info->fbdefio.mutex
955 * Touching ANY framebuffer memory that triggers a page fault
956 * in fb_defio will cause a deadlock, when it also tries to
957 * grab the same mutex. */
958 static void ufx_dpy_deferred_io(struct fb_info *info,
959 struct list_head *pagelist)
960 {
961 struct page *cur;
962 struct fb_deferred_io *fbdefio = info->fbdefio;
963 struct ufx_data *dev = info->par;
964
965 if (!fb_defio)
966 return;
967
968 if (!atomic_read(&dev->usb_active))
969 return;
970
971 /* walk the written page list and render each to device */
972 list_for_each_entry(cur, &fbdefio->pagelist, lru) {
973 /* create a rectangle of full screen width that encloses the
974 * entire dirty framebuffer page */
975 const int x = 0;
976 const int width = dev->info->var.xres;
977 const int y = (cur->index << PAGE_SHIFT) / (width * 2);
978 int height = (PAGE_SIZE / (width * 2)) + 1;
979 height = min(height, (int)(dev->info->var.yres - y));
980
981 BUG_ON(y >= dev->info->var.yres);
982 BUG_ON((y + height) > dev->info->var.yres);
983
984 ufx_handle_damage(dev, x, y, width, height);
985 }
986 }
987
988 static int ufx_ops_ioctl(struct fb_info *info, unsigned int cmd,
989 unsigned long arg)
990 {
991 struct ufx_data *dev = info->par;
992 struct dloarea *area = NULL;
993
994 if (!atomic_read(&dev->usb_active))
995 return 0;
996
997 /* TODO: Update X server to get this from sysfs instead */
998 if (cmd == UFX_IOCTL_RETURN_EDID) {
999 u8 __user *edid = (u8 __user *)arg;
1000 if (copy_to_user(edid, dev->edid, dev->edid_size))
1001 return -EFAULT;
1002 return 0;
1003 }
1004
1005 /* TODO: Help propose a standard fb.h ioctl to report mmap damage */
1006 if (cmd == UFX_IOCTL_REPORT_DAMAGE) {
1007 /* If we have a damage-aware client, turn fb_defio "off"
1008 * To avoid perf imact of unnecessary page fault handling.
1009 * Done by resetting the delay for this fb_info to a very
1010 * long period. Pages will become writable and stay that way.
1011 * Reset to normal value when all clients have closed this fb.
1012 */
1013 if (info->fbdefio)
1014 info->fbdefio->delay = UFX_DEFIO_WRITE_DISABLE;
1015
1016 area = (struct dloarea *)arg;
1017
1018 if (area->x < 0)
1019 area->x = 0;
1020
1021 if (area->x > info->var.xres)
1022 area->x = info->var.xres;
1023
1024 if (area->y < 0)
1025 area->y = 0;
1026
1027 if (area->y > info->var.yres)
1028 area->y = info->var.yres;
1029
1030 ufx_handle_damage(dev, area->x, area->y, area->w, area->h);
1031 }
1032
1033 return 0;
1034 }
1035
1036 /* taken from vesafb */
1037 static int
1038 ufx_ops_setcolreg(unsigned regno, unsigned red, unsigned green,
1039 unsigned blue, unsigned transp, struct fb_info *info)
1040 {
1041 int err = 0;
1042
1043 if (regno >= info->cmap.len)
1044 return 1;
1045
1046 if (regno < 16) {
1047 if (info->var.red.offset == 10) {
1048 /* 1:5:5:5 */
1049 ((u32 *) (info->pseudo_palette))[regno] =
1050 ((red & 0xf800) >> 1) |
1051 ((green & 0xf800) >> 6) | ((blue & 0xf800) >> 11);
1052 } else {
1053 /* 0:5:6:5 */
1054 ((u32 *) (info->pseudo_palette))[regno] =
1055 ((red & 0xf800)) |
1056 ((green & 0xfc00) >> 5) | ((blue & 0xf800) >> 11);
1057 }
1058 }
1059
1060 return err;
1061 }
1062
1063 /* It's common for several clients to have framebuffer open simultaneously.
1064 * e.g. both fbcon and X. Makes things interesting.
1065 * Assumes caller is holding info->lock (for open and release at least) */
1066 static int ufx_ops_open(struct fb_info *info, int user)
1067 {
1068 struct ufx_data *dev = info->par;
1069
1070 /* fbcon aggressively connects to first framebuffer it finds,
1071 * preventing other clients (X) from working properly. Usually
1072 * not what the user wants. Fail by default with option to enable. */
1073 if (user == 0 && !console)
1074 return -EBUSY;
1075
1076 /* If the USB device is gone, we don't accept new opens */
1077 if (dev->virtualized)
1078 return -ENODEV;
1079
1080 dev->fb_count++;
1081
1082 kref_get(&dev->kref);
1083
1084 if (fb_defio && (info->fbdefio == NULL)) {
1085 /* enable defio at last moment if not disabled by client */
1086
1087 struct fb_deferred_io *fbdefio;
1088
1089 fbdefio = kzalloc(sizeof(*fbdefio), GFP_KERNEL);
1090 if (fbdefio) {
1091 fbdefio->delay = UFX_DEFIO_WRITE_DELAY;
1092 fbdefio->deferred_io = ufx_dpy_deferred_io;
1093 }
1094
1095 info->fbdefio = fbdefio;
1096 fb_deferred_io_init(info);
1097 }
1098
1099 pr_debug("open /dev/fb%d user=%d fb_info=%p count=%d",
1100 info->node, user, info, dev->fb_count);
1101
1102 return 0;
1103 }
1104
1105 /*
1106 * Called when all client interfaces to start transactions have been disabled,
1107 * and all references to our device instance (ufx_data) are released.
1108 * Every transaction must have a reference, so we know are fully spun down
1109 */
1110 static void ufx_free(struct kref *kref)
1111 {
1112 struct ufx_data *dev = container_of(kref, struct ufx_data, kref);
1113
1114 /* this function will wait for all in-flight urbs to complete */
1115 if (dev->urbs.count > 0)
1116 ufx_free_urb_list(dev);
1117
1118 pr_debug("freeing ufx_data %p", dev);
1119
1120 kfree(dev);
1121 }
1122
1123 static void ufx_release_urb_work(struct work_struct *work)
1124 {
1125 struct urb_node *unode = container_of(work, struct urb_node,
1126 release_urb_work.work);
1127
1128 up(&unode->dev->urbs.limit_sem);
1129 }
1130
1131 static void ufx_free_framebuffer_work(struct work_struct *work)
1132 {
1133 struct ufx_data *dev = container_of(work, struct ufx_data,
1134 free_framebuffer_work.work);
1135 struct fb_info *info = dev->info;
1136 int node = info->node;
1137
1138 unregister_framebuffer(info);
1139
1140 if (info->cmap.len != 0)
1141 fb_dealloc_cmap(&info->cmap);
1142 if (info->monspecs.modedb)
1143 fb_destroy_modedb(info->monspecs.modedb);
1144 vfree(info->screen_base);
1145
1146 fb_destroy_modelist(&info->modelist);
1147
1148 dev->info = NULL;
1149
1150 /* Assume info structure is freed after this point */
1151 framebuffer_release(info);
1152
1153 pr_debug("fb_info for /dev/fb%d has been freed", node);
1154
1155 /* ref taken in probe() as part of registering framebfufer */
1156 kref_put(&dev->kref, ufx_free);
1157 }
1158
1159 /*
1160 * Assumes caller is holding info->lock mutex (for open and release at least)
1161 */
1162 static int ufx_ops_release(struct fb_info *info, int user)
1163 {
1164 struct ufx_data *dev = info->par;
1165
1166 dev->fb_count--;
1167
1168 /* We can't free fb_info here - fbmem will touch it when we return */
1169 if (dev->virtualized && (dev->fb_count == 0))
1170 schedule_delayed_work(&dev->free_framebuffer_work, HZ);
1171
1172 if ((dev->fb_count == 0) && (info->fbdefio)) {
1173 fb_deferred_io_cleanup(info);
1174 kfree(info->fbdefio);
1175 info->fbdefio = NULL;
1176 info->fbops->fb_mmap = ufx_ops_mmap;
1177 }
1178
1179 pr_debug("released /dev/fb%d user=%d count=%d",
1180 info->node, user, dev->fb_count);
1181
1182 kref_put(&dev->kref, ufx_free);
1183
1184 return 0;
1185 }
1186
1187 /* Check whether a video mode is supported by the chip
1188 * We start from monitor's modes, so don't need to filter that here */
1189 static int ufx_is_valid_mode(struct fb_videomode *mode,
1190 struct fb_info *info)
1191 {
1192 if ((mode->xres * mode->yres) > (2048 * 1152)) {
1193 pr_debug("%dx%d too many pixels",
1194 mode->xres, mode->yres);
1195 return 0;
1196 }
1197
1198 if (mode->pixclock < 5000) {
1199 pr_debug("%dx%d %dps pixel clock too fast",
1200 mode->xres, mode->yres, mode->pixclock);
1201 return 0;
1202 }
1203
1204 pr_debug("%dx%d (pixclk %dps %dMHz) valid mode", mode->xres, mode->yres,
1205 mode->pixclock, (1000000 / mode->pixclock));
1206 return 1;
1207 }
1208
1209 static void ufx_var_color_format(struct fb_var_screeninfo *var)
1210 {
1211 const struct fb_bitfield red = { 11, 5, 0 };
1212 const struct fb_bitfield green = { 5, 6, 0 };
1213 const struct fb_bitfield blue = { 0, 5, 0 };
1214
1215 var->bits_per_pixel = 16;
1216 var->red = red;
1217 var->green = green;
1218 var->blue = blue;
1219 }
1220
1221 static int ufx_ops_check_var(struct fb_var_screeninfo *var,
1222 struct fb_info *info)
1223 {
1224 struct fb_videomode mode;
1225
1226 /* TODO: support dynamically changing framebuffer size */
1227 if ((var->xres * var->yres * 2) > info->fix.smem_len)
1228 return -EINVAL;
1229
1230 /* set device-specific elements of var unrelated to mode */
1231 ufx_var_color_format(var);
1232
1233 fb_var_to_videomode(&mode, var);
1234
1235 if (!ufx_is_valid_mode(&mode, info))
1236 return -EINVAL;
1237
1238 return 0;
1239 }
1240
1241 static int ufx_ops_set_par(struct fb_info *info)
1242 {
1243 struct ufx_data *dev = info->par;
1244 int result;
1245 u16 *pix_framebuffer;
1246 int i;
1247
1248 pr_debug("set_par mode %dx%d", info->var.xres, info->var.yres);
1249 result = ufx_set_vid_mode(dev, &info->var);
1250
1251 if ((result == 0) && (dev->fb_count == 0)) {
1252 /* paint greenscreen */
1253 pix_framebuffer = (u16 *) info->screen_base;
1254 for (i = 0; i < info->fix.smem_len / 2; i++)
1255 pix_framebuffer[i] = 0x37e6;
1256
1257 ufx_handle_damage(dev, 0, 0, info->var.xres, info->var.yres);
1258 }
1259
1260 /* re-enable defio if previously disabled by damage tracking */
1261 if (info->fbdefio)
1262 info->fbdefio->delay = UFX_DEFIO_WRITE_DELAY;
1263
1264 return result;
1265 }
1266
1267 /* In order to come back from full DPMS off, we need to set the mode again */
1268 static int ufx_ops_blank(int blank_mode, struct fb_info *info)
1269 {
1270 struct ufx_data *dev = info->par;
1271 ufx_set_vid_mode(dev, &info->var);
1272 return 0;
1273 }
1274
1275 static struct fb_ops ufx_ops = {
1276 .owner = THIS_MODULE,
1277 .fb_read = fb_sys_read,
1278 .fb_write = ufx_ops_write,
1279 .fb_setcolreg = ufx_ops_setcolreg,
1280 .fb_fillrect = ufx_ops_fillrect,
1281 .fb_copyarea = ufx_ops_copyarea,
1282 .fb_imageblit = ufx_ops_imageblit,
1283 .fb_mmap = ufx_ops_mmap,
1284 .fb_ioctl = ufx_ops_ioctl,
1285 .fb_open = ufx_ops_open,
1286 .fb_release = ufx_ops_release,
1287 .fb_blank = ufx_ops_blank,
1288 .fb_check_var = ufx_ops_check_var,
1289 .fb_set_par = ufx_ops_set_par,
1290 };
1291
1292 /* Assumes &info->lock held by caller
1293 * Assumes no active clients have framebuffer open */
1294 static int ufx_realloc_framebuffer(struct ufx_data *dev, struct fb_info *info)
1295 {
1296 int retval = -ENOMEM;
1297 int old_len = info->fix.smem_len;
1298 int new_len;
1299 unsigned char *old_fb = info->screen_base;
1300 unsigned char *new_fb;
1301
1302 pr_debug("Reallocating framebuffer. Addresses will change!");
1303
1304 new_len = info->fix.line_length * info->var.yres;
1305
1306 if (PAGE_ALIGN(new_len) > old_len) {
1307 /*
1308 * Alloc system memory for virtual framebuffer
1309 */
1310 new_fb = vmalloc(new_len);
1311 if (!new_fb) {
1312 pr_err("Virtual framebuffer alloc failed");
1313 goto error;
1314 }
1315
1316 if (info->screen_base) {
1317 memcpy(new_fb, old_fb, old_len);
1318 vfree(info->screen_base);
1319 }
1320
1321 info->screen_base = new_fb;
1322 info->fix.smem_len = PAGE_ALIGN(new_len);
1323 info->fix.smem_start = (unsigned long) new_fb;
1324 info->flags = smscufx_info_flags;
1325 }
1326
1327 retval = 0;
1328
1329 error:
1330 return retval;
1331 }
1332
1333 /* sets up I2C Controller for 100 Kbps, std. speed, 7-bit addr, master,
1334 * restart enabled, but no start byte, enable controller */
1335 static int ufx_i2c_init(struct ufx_data *dev)
1336 {
1337 u32 tmp;
1338
1339 /* disable the controller before it can be reprogrammed */
1340 int status = ufx_reg_write(dev, 0x106C, 0x00);
1341 check_warn_return(status, "failed to disable I2C");
1342
1343 /* Setup the clock count registers
1344 * (12+1) = 13 clks @ 2.5 MHz = 5.2 uS */
1345 status = ufx_reg_write(dev, 0x1018, 12);
1346 check_warn_return(status, "error writing 0x1018");
1347
1348 /* (6+8) = 14 clks @ 2.5 MHz = 5.6 uS */
1349 status = ufx_reg_write(dev, 0x1014, 6);
1350 check_warn_return(status, "error writing 0x1014");
1351
1352 status = ufx_reg_read(dev, 0x1000, &tmp);
1353 check_warn_return(status, "error reading 0x1000");
1354
1355 /* set speed to std mode */
1356 tmp &= ~(0x06);
1357 tmp |= 0x02;
1358
1359 /* 7-bit (not 10-bit) addressing */
1360 tmp &= ~(0x10);
1361
1362 /* enable restart conditions and master mode */
1363 tmp |= 0x21;
1364
1365 status = ufx_reg_write(dev, 0x1000, tmp);
1366 check_warn_return(status, "error writing 0x1000");
1367
1368 /* Set normal tx using target address 0 */
1369 status = ufx_reg_clear_and_set_bits(dev, 0x1004, 0xC00, 0x000);
1370 check_warn_return(status, "error setting TX mode bits in 0x1004");
1371
1372 /* Enable the controller */
1373 status = ufx_reg_write(dev, 0x106C, 0x01);
1374 check_warn_return(status, "failed to enable I2C");
1375
1376 return 0;
1377 }
1378
1379 /* sets the I2C port mux and target address */
1380 static int ufx_i2c_configure(struct ufx_data *dev)
1381 {
1382 int status = ufx_reg_write(dev, 0x106C, 0x00);
1383 check_warn_return(status, "failed to disable I2C");
1384
1385 status = ufx_reg_write(dev, 0x3010, 0x00000000);
1386 check_warn_return(status, "failed to write 0x3010");
1387
1388 /* A0h is std for any EDID, right shifted by one */
1389 status = ufx_reg_clear_and_set_bits(dev, 0x1004, 0x3FF, (0xA0 >> 1));
1390 check_warn_return(status, "failed to set TAR bits in 0x1004");
1391
1392 status = ufx_reg_write(dev, 0x106C, 0x01);
1393 check_warn_return(status, "failed to enable I2C");
1394
1395 return 0;
1396 }
1397
1398 /* wait for BUSY to clear, with a timeout of 50ms with 10ms sleeps. if no
1399 * monitor is connected, there is no error except for timeout */
1400 static int ufx_i2c_wait_busy(struct ufx_data *dev)
1401 {
1402 u32 tmp;
1403 int i, status;
1404
1405 for (i = 0; i < 15; i++) {
1406 status = ufx_reg_read(dev, 0x1100, &tmp);
1407 check_warn_return(status, "0x1100 read failed");
1408
1409 /* if BUSY is clear, check for error */
1410 if ((tmp & 0x80000000) == 0) {
1411 if (tmp & 0x20000000) {
1412 pr_warn("I2C read failed, 0x1100=0x%08x", tmp);
1413 return -EIO;
1414 }
1415
1416 return 0;
1417 }
1418
1419 /* perform the first 10 retries without delay */
1420 if (i >= 10)
1421 msleep(10);
1422 }
1423
1424 pr_warn("I2C access timed out, resetting I2C hardware");
1425 status = ufx_reg_write(dev, 0x1100, 0x40000000);
1426 check_warn_return(status, "0x1100 write failed");
1427
1428 return -ETIMEDOUT;
1429 }
1430
1431 /* reads a 128-byte EDID block from the currently selected port and TAR */
1432 static int ufx_read_edid(struct ufx_data *dev, u8 *edid, int edid_len)
1433 {
1434 int i, j, status;
1435 u32 *edid_u32 = (u32 *)edid;
1436
1437 BUG_ON(edid_len != EDID_LENGTH);
1438
1439 status = ufx_i2c_configure(dev);
1440 if (status < 0) {
1441 pr_err("ufx_i2c_configure failed");
1442 return status;
1443 }
1444
1445 memset(edid, 0xff, EDID_LENGTH);
1446
1447 /* Read the 128-byte EDID as 2 bursts of 64 bytes */
1448 for (i = 0; i < 2; i++) {
1449 u32 temp = 0x28070000 | (63 << 20) | (((u32)(i * 64)) << 8);
1450 status = ufx_reg_write(dev, 0x1100, temp);
1451 check_warn_return(status, "Failed to write 0x1100");
1452
1453 temp |= 0x80000000;
1454 status = ufx_reg_write(dev, 0x1100, temp);
1455 check_warn_return(status, "Failed to write 0x1100");
1456
1457 status = ufx_i2c_wait_busy(dev);
1458 check_warn_return(status, "Timeout waiting for I2C BUSY to clear");
1459
1460 for (j = 0; j < 16; j++) {
1461 u32 data_reg_addr = 0x1110 + (j * 4);
1462 status = ufx_reg_read(dev, data_reg_addr, edid_u32++);
1463 check_warn_return(status, "Error reading i2c data");
1464 }
1465 }
1466
1467 /* all FF's in the first 16 bytes indicates nothing is connected */
1468 for (i = 0; i < 16; i++) {
1469 if (edid[i] != 0xFF) {
1470 pr_debug("edid data read successfully");
1471 return EDID_LENGTH;
1472 }
1473 }
1474
1475 pr_warn("edid data contains all 0xff");
1476 return -ETIMEDOUT;
1477 }
1478
1479 /* 1) use sw default
1480 * 2) Parse into various fb_info structs
1481 * 3) Allocate virtual framebuffer memory to back highest res mode
1482 *
1483 * Parses EDID into three places used by various parts of fbdev:
1484 * fb_var_screeninfo contains the timing of the monitor's preferred mode
1485 * fb_info.monspecs is full parsed EDID info, including monspecs.modedb
1486 * fb_info.modelist is a linked list of all monitor & VESA modes which work
1487 *
1488 * If EDID is not readable/valid, then modelist is all VESA modes,
1489 * monspecs is NULL, and fb_var_screeninfo is set to safe VESA mode
1490 * Returns 0 if successful */
1491 static int ufx_setup_modes(struct ufx_data *dev, struct fb_info *info,
1492 char *default_edid, size_t default_edid_size)
1493 {
1494 const struct fb_videomode *default_vmode = NULL;
1495 u8 *edid;
1496 int i, result = 0, tries = 3;
1497
1498 if (info->dev) /* only use mutex if info has been registered */
1499 mutex_lock(&info->lock);
1500
1501 edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
1502 if (!edid) {
1503 result = -ENOMEM;
1504 goto error;
1505 }
1506
1507 fb_destroy_modelist(&info->modelist);
1508 memset(&info->monspecs, 0, sizeof(info->monspecs));
1509
1510 /* Try to (re)read EDID from hardware first
1511 * EDID data may return, but not parse as valid
1512 * Try again a few times, in case of e.g. analog cable noise */
1513 while (tries--) {
1514 i = ufx_read_edid(dev, edid, EDID_LENGTH);
1515
1516 if (i >= EDID_LENGTH)
1517 fb_edid_to_monspecs(edid, &info->monspecs);
1518
1519 if (info->monspecs.modedb_len > 0) {
1520 dev->edid = edid;
1521 dev->edid_size = i;
1522 break;
1523 }
1524 }
1525
1526 /* If that fails, use a previously returned EDID if available */
1527 if (info->monspecs.modedb_len == 0) {
1528 pr_err("Unable to get valid EDID from device/display\n");
1529
1530 if (dev->edid) {
1531 fb_edid_to_monspecs(dev->edid, &info->monspecs);
1532 if (info->monspecs.modedb_len > 0)
1533 pr_err("Using previously queried EDID\n");
1534 }
1535 }
1536
1537 /* If that fails, use the default EDID we were handed */
1538 if (info->monspecs.modedb_len == 0) {
1539 if (default_edid_size >= EDID_LENGTH) {
1540 fb_edid_to_monspecs(default_edid, &info->monspecs);
1541 if (info->monspecs.modedb_len > 0) {
1542 memcpy(edid, default_edid, default_edid_size);
1543 dev->edid = edid;
1544 dev->edid_size = default_edid_size;
1545 pr_err("Using default/backup EDID\n");
1546 }
1547 }
1548 }
1549
1550 /* If we've got modes, let's pick a best default mode */
1551 if (info->monspecs.modedb_len > 0) {
1552
1553 for (i = 0; i < info->monspecs.modedb_len; i++) {
1554 if (ufx_is_valid_mode(&info->monspecs.modedb[i], info))
1555 fb_add_videomode(&info->monspecs.modedb[i],
1556 &info->modelist);
1557 else /* if we've removed top/best mode */
1558 info->monspecs.misc &= ~FB_MISC_1ST_DETAIL;
1559 }
1560
1561 default_vmode = fb_find_best_display(&info->monspecs,
1562 &info->modelist);
1563 }
1564
1565 /* If everything else has failed, fall back to safe default mode */
1566 if (default_vmode == NULL) {
1567
1568 struct fb_videomode fb_vmode = {0};
1569
1570 /* Add the standard VESA modes to our modelist
1571 * Since we don't have EDID, there may be modes that
1572 * overspec monitor and/or are incorrect aspect ratio, etc.
1573 * But at least the user has a chance to choose
1574 */
1575 for (i = 0; i < VESA_MODEDB_SIZE; i++) {
1576 if (ufx_is_valid_mode((struct fb_videomode *)
1577 &vesa_modes[i], info))
1578 fb_add_videomode(&vesa_modes[i],
1579 &info->modelist);
1580 }
1581
1582 /* default to resolution safe for projectors
1583 * (since they are most common case without EDID)
1584 */
1585 fb_vmode.xres = 800;
1586 fb_vmode.yres = 600;
1587 fb_vmode.refresh = 60;
1588 default_vmode = fb_find_nearest_mode(&fb_vmode,
1589 &info->modelist);
1590 }
1591
1592 /* If we have good mode and no active clients */
1593 if ((default_vmode != NULL) && (dev->fb_count == 0)) {
1594
1595 fb_videomode_to_var(&info->var, default_vmode);
1596 ufx_var_color_format(&info->var);
1597
1598 /* with mode size info, we can now alloc our framebuffer */
1599 memcpy(&info->fix, &ufx_fix, sizeof(ufx_fix));
1600 info->fix.line_length = info->var.xres *
1601 (info->var.bits_per_pixel / 8);
1602
1603 result = ufx_realloc_framebuffer(dev, info);
1604
1605 } else
1606 result = -EINVAL;
1607
1608 error:
1609 if (edid && (dev->edid != edid))
1610 kfree(edid);
1611
1612 if (info->dev)
1613 mutex_unlock(&info->lock);
1614
1615 return result;
1616 }
1617
1618 static int ufx_usb_probe(struct usb_interface *interface,
1619 const struct usb_device_id *id)
1620 {
1621 struct usb_device *usbdev;
1622 struct ufx_data *dev;
1623 struct fb_info *info = NULL;
1624 int retval = -ENOMEM;
1625 u32 id_rev, fpga_rev;
1626
1627 /* usb initialization */
1628 usbdev = interface_to_usbdev(interface);
1629 BUG_ON(!usbdev);
1630
1631 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1632 if (dev == NULL) {
1633 dev_err(&usbdev->dev, "ufx_usb_probe: failed alloc of dev struct\n");
1634 goto error;
1635 }
1636
1637 /* we need to wait for both usb and fbdev to spin down on disconnect */
1638 kref_init(&dev->kref); /* matching kref_put in usb .disconnect fn */
1639 kref_get(&dev->kref); /* matching kref_put in free_framebuffer_work */
1640
1641 dev->udev = usbdev;
1642 dev->gdev = &usbdev->dev; /* our generic struct device * */
1643 usb_set_intfdata(interface, dev);
1644
1645 dev_dbg(dev->gdev, "%s %s - serial #%s\n",
1646 usbdev->manufacturer, usbdev->product, usbdev->serial);
1647 dev_dbg(dev->gdev, "vid_%04x&pid_%04x&rev_%04x driver's ufx_data struct at %p\n",
1648 le16_to_cpu(usbdev->descriptor.idVendor),
1649 le16_to_cpu(usbdev->descriptor.idProduct),
1650 le16_to_cpu(usbdev->descriptor.bcdDevice), dev);
1651 dev_dbg(dev->gdev, "console enable=%d\n", console);
1652 dev_dbg(dev->gdev, "fb_defio enable=%d\n", fb_defio);
1653
1654 if (!ufx_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
1655 retval = -ENOMEM;
1656 dev_err(dev->gdev, "ufx_alloc_urb_list failed\n");
1657 goto error;
1658 }
1659
1660 /* We don't register a new USB class. Our client interface is fbdev */
1661
1662 /* allocates framebuffer driver structure, not framebuffer memory */
1663 info = framebuffer_alloc(0, &usbdev->dev);
1664 if (!info) {
1665 retval = -ENOMEM;
1666 dev_err(dev->gdev, "framebuffer_alloc failed\n");
1667 goto error;
1668 }
1669
1670 dev->info = info;
1671 info->par = dev;
1672 info->pseudo_palette = dev->pseudo_palette;
1673 info->fbops = &ufx_ops;
1674
1675 retval = fb_alloc_cmap(&info->cmap, 256, 0);
1676 if (retval < 0) {
1677 dev_err(dev->gdev, "fb_alloc_cmap failed %x\n", retval);
1678 goto error;
1679 }
1680
1681 INIT_DELAYED_WORK(&dev->free_framebuffer_work,
1682 ufx_free_framebuffer_work);
1683
1684 INIT_LIST_HEAD(&info->modelist);
1685
1686 retval = ufx_reg_read(dev, 0x3000, &id_rev);
1687 check_warn_goto_error(retval, "error %d reading 0x3000 register from device", retval);
1688 dev_dbg(dev->gdev, "ID_REV register value 0x%08x", id_rev);
1689
1690 retval = ufx_reg_read(dev, 0x3004, &fpga_rev);
1691 check_warn_goto_error(retval, "error %d reading 0x3004 register from device", retval);
1692 dev_dbg(dev->gdev, "FPGA_REV register value 0x%08x", fpga_rev);
1693
1694 dev_dbg(dev->gdev, "resetting device");
1695 retval = ufx_lite_reset(dev);
1696 check_warn_goto_error(retval, "error %d resetting device", retval);
1697
1698 dev_dbg(dev->gdev, "configuring system clock");
1699 retval = ufx_config_sys_clk(dev);
1700 check_warn_goto_error(retval, "error %d configuring system clock", retval);
1701
1702 dev_dbg(dev->gdev, "configuring DDR2 controller");
1703 retval = ufx_config_ddr2(dev);
1704 check_warn_goto_error(retval, "error %d initialising DDR2 controller", retval);
1705
1706 dev_dbg(dev->gdev, "configuring I2C controller");
1707 retval = ufx_i2c_init(dev);
1708 check_warn_goto_error(retval, "error %d initialising I2C controller", retval);
1709
1710 dev_dbg(dev->gdev, "selecting display mode");
1711 retval = ufx_setup_modes(dev, info, NULL, 0);
1712 check_warn_goto_error(retval, "unable to find common mode for display and adapter");
1713
1714 retval = ufx_reg_set_bits(dev, 0x4000, 0x00000001);
1715 check_warn_goto_error(retval, "error %d enabling graphics engine", retval);
1716
1717 /* ready to begin using device */
1718 atomic_set(&dev->usb_active, 1);
1719
1720 dev_dbg(dev->gdev, "checking var");
1721 retval = ufx_ops_check_var(&info->var, info);
1722 check_warn_goto_error(retval, "error %d ufx_ops_check_var", retval);
1723
1724 dev_dbg(dev->gdev, "setting par");
1725 retval = ufx_ops_set_par(info);
1726 check_warn_goto_error(retval, "error %d ufx_ops_set_par", retval);
1727
1728 dev_dbg(dev->gdev, "registering framebuffer");
1729 retval = register_framebuffer(info);
1730 check_warn_goto_error(retval, "error %d register_framebuffer", retval);
1731
1732 dev_info(dev->gdev, "SMSC UDX USB device /dev/fb%d attached. %dx%d resolution."
1733 " Using %dK framebuffer memory\n", info->node,
1734 info->var.xres, info->var.yres, info->fix.smem_len >> 10);
1735
1736 return 0;
1737
1738 error:
1739 if (dev) {
1740 if (info) {
1741 if (info->cmap.len != 0)
1742 fb_dealloc_cmap(&info->cmap);
1743 if (info->monspecs.modedb)
1744 fb_destroy_modedb(info->monspecs.modedb);
1745 vfree(info->screen_base);
1746
1747 fb_destroy_modelist(&info->modelist);
1748
1749 framebuffer_release(info);
1750 }
1751
1752 kref_put(&dev->kref, ufx_free); /* ref for framebuffer */
1753 kref_put(&dev->kref, ufx_free); /* last ref from kref_init */
1754
1755 /* dev has been deallocated. Do not dereference */
1756 }
1757
1758 return retval;
1759 }
1760
1761 static void ufx_usb_disconnect(struct usb_interface *interface)
1762 {
1763 struct ufx_data *dev;
1764
1765 dev = usb_get_intfdata(interface);
1766
1767 pr_debug("USB disconnect starting\n");
1768
1769 /* we virtualize until all fb clients release. Then we free */
1770 dev->virtualized = true;
1771
1772 /* When non-active we'll update virtual framebuffer, but no new urbs */
1773 atomic_set(&dev->usb_active, 0);
1774
1775 usb_set_intfdata(interface, NULL);
1776
1777 /* if clients still have us open, will be freed on last close */
1778 if (dev->fb_count == 0)
1779 schedule_delayed_work(&dev->free_framebuffer_work, 0);
1780
1781 /* release reference taken by kref_init in probe() */
1782 kref_put(&dev->kref, ufx_free);
1783
1784 /* consider ufx_data freed */
1785 }
1786
1787 static struct usb_driver ufx_driver = {
1788 .name = "smscufx",
1789 .probe = ufx_usb_probe,
1790 .disconnect = ufx_usb_disconnect,
1791 .id_table = id_table,
1792 };
1793
1794 module_usb_driver(ufx_driver);
1795
1796 static void ufx_urb_completion(struct urb *urb)
1797 {
1798 struct urb_node *unode = urb->context;
1799 struct ufx_data *dev = unode->dev;
1800 unsigned long flags;
1801
1802 /* sync/async unlink faults aren't errors */
1803 if (urb->status) {
1804 if (!(urb->status == -ENOENT ||
1805 urb->status == -ECONNRESET ||
1806 urb->status == -ESHUTDOWN)) {
1807 pr_err("%s - nonzero write bulk status received: %d\n",
1808 __func__, urb->status);
1809 atomic_set(&dev->lost_pixels, 1);
1810 }
1811 }
1812
1813 urb->transfer_buffer_length = dev->urbs.size; /* reset to actual */
1814
1815 spin_lock_irqsave(&dev->urbs.lock, flags);
1816 list_add_tail(&unode->entry, &dev->urbs.list);
1817 dev->urbs.available++;
1818 spin_unlock_irqrestore(&dev->urbs.lock, flags);
1819
1820 /* When using fb_defio, we deadlock if up() is called
1821 * while another is waiting. So queue to another process */
1822 if (fb_defio)
1823 schedule_delayed_work(&unode->release_urb_work, 0);
1824 else
1825 up(&dev->urbs.limit_sem);
1826 }
1827
1828 static void ufx_free_urb_list(struct ufx_data *dev)
1829 {
1830 int count = dev->urbs.count;
1831 struct list_head *node;
1832 struct urb_node *unode;
1833 struct urb *urb;
1834 int ret;
1835 unsigned long flags;
1836
1837 pr_debug("Waiting for completes and freeing all render urbs\n");
1838
1839 /* keep waiting and freeing, until we've got 'em all */
1840 while (count--) {
1841 /* Getting interrupted means a leak, but ok at shutdown*/
1842 ret = down_interruptible(&dev->urbs.limit_sem);
1843 if (ret)
1844 break;
1845
1846 spin_lock_irqsave(&dev->urbs.lock, flags);
1847
1848 node = dev->urbs.list.next; /* have reserved one with sem */
1849 list_del_init(node);
1850
1851 spin_unlock_irqrestore(&dev->urbs.lock, flags);
1852
1853 unode = list_entry(node, struct urb_node, entry);
1854 urb = unode->urb;
1855
1856 /* Free each separately allocated piece */
1857 usb_free_coherent(urb->dev, dev->urbs.size,
1858 urb->transfer_buffer, urb->transfer_dma);
1859 usb_free_urb(urb);
1860 kfree(node);
1861 }
1862 }
1863
1864 static int ufx_alloc_urb_list(struct ufx_data *dev, int count, size_t size)
1865 {
1866 int i = 0;
1867 struct urb *urb;
1868 struct urb_node *unode;
1869 char *buf;
1870
1871 spin_lock_init(&dev->urbs.lock);
1872
1873 dev->urbs.size = size;
1874 INIT_LIST_HEAD(&dev->urbs.list);
1875
1876 while (i < count) {
1877 unode = kzalloc(sizeof(*unode), GFP_KERNEL);
1878 if (!unode)
1879 break;
1880 unode->dev = dev;
1881
1882 INIT_DELAYED_WORK(&unode->release_urb_work,
1883 ufx_release_urb_work);
1884
1885 urb = usb_alloc_urb(0, GFP_KERNEL);
1886 if (!urb) {
1887 kfree(unode);
1888 break;
1889 }
1890 unode->urb = urb;
1891
1892 buf = usb_alloc_coherent(dev->udev, size, GFP_KERNEL,
1893 &urb->transfer_dma);
1894 if (!buf) {
1895 kfree(unode);
1896 usb_free_urb(urb);
1897 break;
1898 }
1899
1900 /* urb->transfer_buffer_length set to actual before submit */
1901 usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 1),
1902 buf, size, ufx_urb_completion, unode);
1903 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1904
1905 list_add_tail(&unode->entry, &dev->urbs.list);
1906
1907 i++;
1908 }
1909
1910 sema_init(&dev->urbs.limit_sem, i);
1911 dev->urbs.count = i;
1912 dev->urbs.available = i;
1913
1914 pr_debug("allocated %d %d byte urbs\n", i, (int) size);
1915
1916 return i;
1917 }
1918
1919 static struct urb *ufx_get_urb(struct ufx_data *dev)
1920 {
1921 int ret = 0;
1922 struct list_head *entry;
1923 struct urb_node *unode;
1924 struct urb *urb = NULL;
1925 unsigned long flags;
1926
1927 /* Wait for an in-flight buffer to complete and get re-queued */
1928 ret = down_timeout(&dev->urbs.limit_sem, GET_URB_TIMEOUT);
1929 if (ret) {
1930 atomic_set(&dev->lost_pixels, 1);
1931 pr_warn("wait for urb interrupted: %x available: %d\n",
1932 ret, dev->urbs.available);
1933 goto error;
1934 }
1935
1936 spin_lock_irqsave(&dev->urbs.lock, flags);
1937
1938 BUG_ON(list_empty(&dev->urbs.list)); /* reserved one with limit_sem */
1939 entry = dev->urbs.list.next;
1940 list_del_init(entry);
1941 dev->urbs.available--;
1942
1943 spin_unlock_irqrestore(&dev->urbs.lock, flags);
1944
1945 unode = list_entry(entry, struct urb_node, entry);
1946 urb = unode->urb;
1947
1948 error:
1949 return urb;
1950 }
1951
1952 static int ufx_submit_urb(struct ufx_data *dev, struct urb *urb, size_t len)
1953 {
1954 int ret;
1955
1956 BUG_ON(len > dev->urbs.size);
1957
1958 urb->transfer_buffer_length = len; /* set to actual payload len */
1959 ret = usb_submit_urb(urb, GFP_KERNEL);
1960 if (ret) {
1961 ufx_urb_completion(urb); /* because no one else will */
1962 atomic_set(&dev->lost_pixels, 1);
1963 pr_err("usb_submit_urb error %x\n", ret);
1964 }
1965 return ret;
1966 }
1967
1968 module_param(console, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
1969 MODULE_PARM_DESC(console, "Allow fbcon to be used on this display");
1970
1971 module_param(fb_defio, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
1972 MODULE_PARM_DESC(fb_defio, "Enable fb_defio mmap support");
1973
1974 MODULE_AUTHOR("Steve Glendinning <steve.glendinning@shawell.net>");
1975 MODULE_DESCRIPTION("SMSC UFX kernel framebuffer driver");
1976 MODULE_LICENSE("GPL");
Linux with added FPC-III support