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smscufx.c
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1 /*
2  * smscufx.c -- Framebuffer driver for SMSC UFX USB controller
3  *
4  * Copyright (C) 2011 Steve Glendinning <[email protected]>
5  * Copyright (C) 2009 Roberto De Ioris <[email protected]>
6  * Copyright (C) 2009 Jaya Kumar <[email protected]>
7  * Copyright (C) 2009 Bernie Thompson <[email protected]>
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;
83  struct urb *urb;
84 };
85 
86 struct urb_list {
87  struct list_head list;
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 */
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;
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 |
124 
125 static 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),
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),
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 {
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 (offset + size > info->fix.smem_len)
786  return -EINVAL;
787 
788  pos = (unsigned long)info->fix.smem_start + offset;
789 
790  pr_debug("mmap() framebuffer addr:%lu size:%lu\n",
791  pos, size);
792 
793  while (size > 0) {
794  page = vmalloc_to_pfn((void *)pos);
795  if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
796  return -EAGAIN;
797 
798  start += PAGE_SIZE;
799  pos += PAGE_SIZE;
800  if (size > PAGE_SIZE)
801  size -= PAGE_SIZE;
802  else
803  size = 0;
804  }
805 
806  return 0;
807 }
808 
809 static void ufx_raw_rect(struct ufx_data *dev, u16 *cmd, int x, int y,
810  int width, int height)
811 {
812  size_t packed_line_len = ALIGN((width * 2), 4);
813  size_t packed_rect_len = packed_line_len * height;
814  int line;
815 
816  BUG_ON(!dev);
817  BUG_ON(!dev->info);
818 
819  /* command word */
820  *((u32 *)&cmd[0]) = cpu_to_le32(0x01);
821 
822  /* length word */
823  *((u32 *)&cmd[2]) = cpu_to_le32(packed_rect_len + 16);
824 
825  cmd[4] = cpu_to_le16(x);
826  cmd[5] = cpu_to_le16(y);
827  cmd[6] = cpu_to_le16(width);
828  cmd[7] = cpu_to_le16(height);
829 
830  /* frame base address */
831  *((u32 *)&cmd[8]) = cpu_to_le32(0);
832 
833  /* color mode and horizontal resolution */
834  cmd[10] = cpu_to_le16(0x4000 | dev->info->var.xres);
835 
836  /* vertical resolution */
837  cmd[11] = cpu_to_le16(dev->info->var.yres);
838 
839  /* packed data */
840  for (line = 0; line < height; line++) {
841  const int line_offset = dev->info->fix.line_length * (y + line);
842  const int byte_offset = line_offset + (x * BPP);
843  memcpy(&cmd[(24 + (packed_line_len * line)) / 2],
844  (char *)dev->info->fix.smem_start + byte_offset, width * BPP);
845  }
846 }
847 
848 static int ufx_handle_damage(struct ufx_data *dev, int x, int y,
849  int width, int height)
850 {
851  size_t packed_line_len = ALIGN((width * 2), 4);
852  int len, status, urb_lines, start_line = 0;
853 
854  if ((width <= 0) || (height <= 0) ||
855  (x + width > dev->info->var.xres) ||
856  (y + height > dev->info->var.yres))
857  return -EINVAL;
858 
859  if (!atomic_read(&dev->usb_active))
860  return 0;
861 
862  while (start_line < height) {
863  struct urb *urb = ufx_get_urb(dev);
864  if (!urb) {
865  pr_warn("ufx_handle_damage unable to get urb");
866  return 0;
867  }
868 
869  /* assume we have enough space to transfer at least one line */
870  BUG_ON(urb->transfer_buffer_length < (24 + (width * 2)));
871 
872  /* calculate the maximum number of lines we could fit in */
873  urb_lines = (urb->transfer_buffer_length - 24) / packed_line_len;
874 
875  /* but we might not need this many */
876  urb_lines = min(urb_lines, (height - start_line));
877 
878  memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
879 
880  ufx_raw_rect(dev, urb->transfer_buffer, x, (y + start_line), width, urb_lines);
881  len = 24 + (packed_line_len * urb_lines);
882 
883  status = ufx_submit_urb(dev, urb, len);
884  check_warn_return(status, "Error submitting URB");
885 
886  start_line += urb_lines;
887  }
888 
889  return 0;
890 }
891 
892 /* Path triggered by usermode clients who write to filesystem
893  * e.g. cat filename > /dev/fb1
894  * Not used by X Windows or text-mode console. But useful for testing.
895  * Slow because of extra copy and we must assume all pixels dirty. */
896 static ssize_t ufx_ops_write(struct fb_info *info, const char __user *buf,
897  size_t count, loff_t *ppos)
898 {
899  ssize_t result;
900  struct ufx_data *dev = info->par;
901  u32 offset = (u32) *ppos;
902 
903  result = fb_sys_write(info, buf, count, ppos);
904 
905  if (result > 0) {
906  int start = max((int)(offset / info->fix.line_length), 0);
907  int lines = min((u32)((result / info->fix.line_length) + 1),
908  (u32)info->var.yres);
909 
910  ufx_handle_damage(dev, 0, start, info->var.xres, lines);
911  }
912 
913  return result;
914 }
915 
916 static void ufx_ops_copyarea(struct fb_info *info,
917  const struct fb_copyarea *area)
918 {
919 
920  struct ufx_data *dev = info->par;
921 
922  sys_copyarea(info, area);
923 
924  ufx_handle_damage(dev, area->dx, area->dy,
925  area->width, area->height);
926 }
927 
928 static void ufx_ops_imageblit(struct fb_info *info,
929  const struct fb_image *image)
930 {
931  struct ufx_data *dev = info->par;
932 
933  sys_imageblit(info, image);
934 
935  ufx_handle_damage(dev, image->dx, image->dy,
936  image->width, image->height);
937 }
938 
939 static void ufx_ops_fillrect(struct fb_info *info,
940  const struct fb_fillrect *rect)
941 {
942  struct ufx_data *dev = info->par;
943 
944  sys_fillrect(info, rect);
945 
946  ufx_handle_damage(dev, rect->dx, rect->dy, rect->width,
947  rect->height);
948 }
949 
950 /* NOTE: fb_defio.c is holding info->fbdefio.mutex
951  * Touching ANY framebuffer memory that triggers a page fault
952  * in fb_defio will cause a deadlock, when it also tries to
953  * grab the same mutex. */
954 static void ufx_dpy_deferred_io(struct fb_info *info,
955  struct list_head *pagelist)
956 {
957  struct page *cur;
958  struct fb_deferred_io *fbdefio = info->fbdefio;
959  struct ufx_data *dev = info->par;
960 
961  if (!fb_defio)
962  return;
963 
964  if (!atomic_read(&dev->usb_active))
965  return;
966 
967  /* walk the written page list and render each to device */
968  list_for_each_entry(cur, &fbdefio->pagelist, lru) {
969  /* create a rectangle of full screen width that encloses the
970  * entire dirty framebuffer page */
971  const int x = 0;
972  const int width = dev->info->var.xres;
973  const int y = (cur->index << PAGE_SHIFT) / (width * 2);
974  int height = (PAGE_SIZE / (width * 2)) + 1;
975  height = min(height, (int)(dev->info->var.yres - y));
976 
977  BUG_ON(y >= dev->info->var.yres);
978  BUG_ON((y + height) > dev->info->var.yres);
979 
980  ufx_handle_damage(dev, x, y, width, height);
981  }
982 }
983 
984 static int ufx_ops_ioctl(struct fb_info *info, unsigned int cmd,
985  unsigned long arg)
986 {
987  struct ufx_data *dev = info->par;
988  struct dloarea *area = NULL;
989 
990  if (!atomic_read(&dev->usb_active))
991  return 0;
992 
993  /* TODO: Update X server to get this from sysfs instead */
994  if (cmd == UFX_IOCTL_RETURN_EDID) {
995  u8 __user *edid = (u8 __user *)arg;
996  if (copy_to_user(edid, dev->edid, dev->edid_size))
997  return -EFAULT;
998  return 0;
999  }
1000 
1001  /* TODO: Help propose a standard fb.h ioctl to report mmap damage */
1002  if (cmd == UFX_IOCTL_REPORT_DAMAGE) {
1003  /* If we have a damage-aware client, turn fb_defio "off"
1004  * To avoid perf imact of unnecessary page fault handling.
1005  * Done by resetting the delay for this fb_info to a very
1006  * long period. Pages will become writable and stay that way.
1007  * Reset to normal value when all clients have closed this fb.
1008  */
1009  if (info->fbdefio)
1010  info->fbdefio->delay = UFX_DEFIO_WRITE_DISABLE;
1011 
1012  area = (struct dloarea *)arg;
1013 
1014  if (area->x < 0)
1015  area->x = 0;
1016 
1017  if (area->x > info->var.xres)
1018  area->x = info->var.xres;
1019 
1020  if (area->y < 0)
1021  area->y = 0;
1022 
1023  if (area->y > info->var.yres)
1024  area->y = info->var.yres;
1025 
1026  ufx_handle_damage(dev, area->x, area->y, area->w, area->h);
1027  }
1028 
1029  return 0;
1030 }
1031 
1032 /* taken from vesafb */
1033 static int
1034 ufx_ops_setcolreg(unsigned regno, unsigned red, unsigned green,
1035  unsigned blue, unsigned transp, struct fb_info *info)
1036 {
1037  int err = 0;
1038 
1039  if (regno >= info->cmap.len)
1040  return 1;
1041 
1042  if (regno < 16) {
1043  if (info->var.red.offset == 10) {
1044  /* 1:5:5:5 */
1045  ((u32 *) (info->pseudo_palette))[regno] =
1046  ((red & 0xf800) >> 1) |
1047  ((green & 0xf800) >> 6) | ((blue & 0xf800) >> 11);
1048  } else {
1049  /* 0:5:6:5 */
1050  ((u32 *) (info->pseudo_palette))[regno] =
1051  ((red & 0xf800)) |
1052  ((green & 0xfc00) >> 5) | ((blue & 0xf800) >> 11);
1053  }
1054  }
1055 
1056  return err;
1057 }
1058 
1059 /* It's common for several clients to have framebuffer open simultaneously.
1060  * e.g. both fbcon and X. Makes things interesting.
1061  * Assumes caller is holding info->lock (for open and release at least) */
1062 static int ufx_ops_open(struct fb_info *info, int user)
1063 {
1064  struct ufx_data *dev = info->par;
1065 
1066  /* fbcon aggressively connects to first framebuffer it finds,
1067  * preventing other clients (X) from working properly. Usually
1068  * not what the user wants. Fail by default with option to enable. */
1069  if (user == 0 && !console)
1070  return -EBUSY;
1071 
1072  /* If the USB device is gone, we don't accept new opens */
1073  if (dev->virtualized)
1074  return -ENODEV;
1075 
1076  dev->fb_count++;
1077 
1078  kref_get(&dev->kref);
1079 
1080  if (fb_defio && (info->fbdefio == NULL)) {
1081  /* enable defio at last moment if not disabled by client */
1082 
1083  struct fb_deferred_io *fbdefio;
1084 
1085  fbdefio = kzalloc(sizeof(struct fb_deferred_io), GFP_KERNEL);
1086 
1087  if (fbdefio) {
1088  fbdefio->delay = UFX_DEFIO_WRITE_DELAY;
1089  fbdefio->deferred_io = ufx_dpy_deferred_io;
1090  }
1091 
1092  info->fbdefio = fbdefio;
1093  fb_deferred_io_init(info);
1094  }
1095 
1096  pr_debug("open /dev/fb%d user=%d fb_info=%p count=%d",
1097  info->node, user, info, dev->fb_count);
1098 
1099  return 0;
1100 }
1101 
1102 /*
1103  * Called when all client interfaces to start transactions have been disabled,
1104  * and all references to our device instance (ufx_data) are released.
1105  * Every transaction must have a reference, so we know are fully spun down
1106  */
1107 static void ufx_free(struct kref *kref)
1108 {
1109  struct ufx_data *dev = container_of(kref, struct ufx_data, kref);
1110 
1111  /* this function will wait for all in-flight urbs to complete */
1112  if (dev->urbs.count > 0)
1113  ufx_free_urb_list(dev);
1114 
1115  pr_debug("freeing ufx_data %p", dev);
1116 
1117  kfree(dev);
1118 }
1119 
1120 static void ufx_release_urb_work(struct work_struct *work)
1121 {
1122  struct urb_node *unode = container_of(work, struct urb_node,
1123  release_urb_work.work);
1124 
1125  up(&unode->dev->urbs.limit_sem);
1126 }
1127 
1128 static void ufx_free_framebuffer_work(struct work_struct *work)
1129 {
1130  struct ufx_data *dev = container_of(work, struct ufx_data,
1131  free_framebuffer_work.work);
1132  struct fb_info *info = dev->info;
1133  int node = info->node;
1134 
1135  unregister_framebuffer(info);
1136 
1137  if (info->cmap.len != 0)
1138  fb_dealloc_cmap(&info->cmap);
1139  if (info->monspecs.modedb)
1140  fb_destroy_modedb(info->monspecs.modedb);
1141  if (info->screen_base)
1142  vfree(info->screen_base);
1143 
1144  fb_destroy_modelist(&info->modelist);
1145 
1146  dev->info = 0;
1147 
1148  /* Assume info structure is freed after this point */
1149  framebuffer_release(info);
1150 
1151  pr_debug("fb_info for /dev/fb%d has been freed", node);
1152 
1153  /* ref taken in probe() as part of registering framebfufer */
1154  kref_put(&dev->kref, ufx_free);
1155 }
1156 
1157 /*
1158  * Assumes caller is holding info->lock mutex (for open and release at least)
1159  */
1160 static int ufx_ops_release(struct fb_info *info, int user)
1161 {
1162  struct ufx_data *dev = info->par;
1163 
1164  dev->fb_count--;
1165 
1166  /* We can't free fb_info here - fbmem will touch it when we return */
1167  if (dev->virtualized && (dev->fb_count == 0))
1169 
1170  if ((dev->fb_count == 0) && (info->fbdefio)) {
1171  fb_deferred_io_cleanup(info);
1172  kfree(info->fbdefio);
1173  info->fbdefio = NULL;
1174  info->fbops->fb_mmap = ufx_ops_mmap;
1175  }
1176 
1177  pr_debug("released /dev/fb%d user=%d count=%d",
1178  info->node, user, dev->fb_count);
1179 
1180  kref_put(&dev->kref, ufx_free);
1181 
1182  return 0;
1183 }
1184 
1185 /* Check whether a video mode is supported by the chip
1186  * We start from monitor's modes, so don't need to filter that here */
1187 static int ufx_is_valid_mode(struct fb_videomode *mode,
1188  struct fb_info *info)
1189 {
1190  if ((mode->xres * mode->yres) > (2048 * 1152)) {
1191  pr_debug("%dx%d too many pixels",
1192  mode->xres, mode->yres);
1193  return 0;
1194  }
1195 
1196  if (mode->pixclock < 5000) {
1197  pr_debug("%dx%d %dps pixel clock too fast",
1198  mode->xres, mode->yres, mode->pixclock);
1199  return 0;
1200  }
1201 
1202  pr_debug("%dx%d (pixclk %dps %dMHz) valid mode", mode->xres, mode->yres,
1203  mode->pixclock, (1000000 / mode->pixclock));
1204  return 1;
1205 }
1206 
1207 static void ufx_var_color_format(struct fb_var_screeninfo *var)
1208 {
1209  const struct fb_bitfield red = { 11, 5, 0 };
1210  const struct fb_bitfield green = { 5, 6, 0 };
1211  const struct fb_bitfield blue = { 0, 5, 0 };
1212 
1213  var->bits_per_pixel = 16;
1214  var->red = red;
1215  var->green = green;
1216  var->blue = blue;
1217 }
1218 
1219 static int ufx_ops_check_var(struct fb_var_screeninfo *var,
1220  struct fb_info *info)
1221 {
1222  struct fb_videomode mode;
1223 
1224  /* TODO: support dynamically changing framebuffer size */
1225  if ((var->xres * var->yres * 2) > info->fix.smem_len)
1226  return -EINVAL;
1227 
1228  /* set device-specific elements of var unrelated to mode */
1229  ufx_var_color_format(var);
1230 
1231  fb_var_to_videomode(&mode, var);
1232 
1233  if (!ufx_is_valid_mode(&mode, info))
1234  return -EINVAL;
1235 
1236  return 0;
1237 }
1238 
1239 static int ufx_ops_set_par(struct fb_info *info)
1240 {
1241  struct ufx_data *dev = info->par;
1242  int result;
1243  u16 *pix_framebuffer;
1244  int i;
1245 
1246  pr_debug("set_par mode %dx%d", info->var.xres, info->var.yres);
1247  result = ufx_set_vid_mode(dev, &info->var);
1248 
1249  if ((result == 0) && (dev->fb_count == 0)) {
1250  /* paint greenscreen */
1251  pix_framebuffer = (u16 *) info->screen_base;
1252  for (i = 0; i < info->fix.smem_len / 2; i++)
1253  pix_framebuffer[i] = 0x37e6;
1254 
1255  ufx_handle_damage(dev, 0, 0, info->var.xres, info->var.yres);
1256  }
1257 
1258  /* re-enable defio if previously disabled by damage tracking */
1259  if (info->fbdefio)
1260  info->fbdefio->delay = UFX_DEFIO_WRITE_DELAY;
1261 
1262  return result;
1263 }
1264 
1265 /* In order to come back from full DPMS off, we need to set the mode again */
1266 static int ufx_ops_blank(int blank_mode, struct fb_info *info)
1267 {
1268  struct ufx_data *dev = info->par;
1269  ufx_set_vid_mode(dev, &info->var);
1270  return 0;
1271 }
1272 
1273 static struct fb_ops ufx_ops = {
1274  .owner = THIS_MODULE,
1275  .fb_read = fb_sys_read,
1276  .fb_write = ufx_ops_write,
1277  .fb_setcolreg = ufx_ops_setcolreg,
1278  .fb_fillrect = ufx_ops_fillrect,
1279  .fb_copyarea = ufx_ops_copyarea,
1280  .fb_imageblit = ufx_ops_imageblit,
1281  .fb_mmap = ufx_ops_mmap,
1282  .fb_ioctl = ufx_ops_ioctl,
1283  .fb_open = ufx_ops_open,
1284  .fb_release = ufx_ops_release,
1285  .fb_blank = ufx_ops_blank,
1286  .fb_check_var = ufx_ops_check_var,
1287  .fb_set_par = ufx_ops_set_par,
1288 };
1289 
1290 /* Assumes &info->lock held by caller
1291  * Assumes no active clients have framebuffer open */
1292 static int ufx_realloc_framebuffer(struct ufx_data *dev, struct fb_info *info)
1293 {
1294  int retval = -ENOMEM;
1295  int old_len = info->fix.smem_len;
1296  int new_len;
1297  unsigned char *old_fb = info->screen_base;
1298  unsigned char *new_fb;
1299 
1300  pr_debug("Reallocating framebuffer. Addresses will change!");
1301 
1302  new_len = info->fix.line_length * info->var.yres;
1303 
1304  if (PAGE_ALIGN(new_len) > old_len) {
1305  /*
1306  * Alloc system memory for virtual framebuffer
1307  */
1308  new_fb = vmalloc(new_len);
1309  if (!new_fb) {
1310  pr_err("Virtual framebuffer alloc failed");
1311  goto error;
1312  }
1313 
1314  if (info->screen_base) {
1315  memcpy(new_fb, old_fb, old_len);
1316  vfree(info->screen_base);
1317  }
1318 
1319  info->screen_base = new_fb;
1320  info->fix.smem_len = PAGE_ALIGN(new_len);
1321  info->fix.smem_start = (unsigned long) new_fb;
1322  info->flags = smscufx_info_flags;
1323  }
1324 
1325  retval = 0;
1326 
1327 error:
1328  return retval;
1329 }
1330 
1331 /* sets up I2C Controller for 100 Kbps, std. speed, 7-bit addr, master,
1332  * restart enabled, but no start byte, enable controller */
1333 static int ufx_i2c_init(struct ufx_data *dev)
1334 {
1335  u32 tmp;
1336 
1337  /* disable the controller before it can be reprogrammed */
1338  int status = ufx_reg_write(dev, 0x106C, 0x00);
1339  check_warn_return(status, "failed to disable I2C");
1340 
1341  /* Setup the clock count registers
1342  * (12+1) = 13 clks @ 2.5 MHz = 5.2 uS */
1343  status = ufx_reg_write(dev, 0x1018, 12);
1344  check_warn_return(status, "error writing 0x1018");
1345 
1346  /* (6+8) = 14 clks @ 2.5 MHz = 5.6 uS */
1347  status = ufx_reg_write(dev, 0x1014, 6);
1348  check_warn_return(status, "error writing 0x1014");
1349 
1350  status = ufx_reg_read(dev, 0x1000, &tmp);
1351  check_warn_return(status, "error reading 0x1000");
1352 
1353  /* set speed to std mode */
1354  tmp &= ~(0x06);
1355  tmp |= 0x02;
1356 
1357  /* 7-bit (not 10-bit) addressing */
1358  tmp &= ~(0x10);
1359 
1360  /* enable restart conditions and master mode */
1361  tmp |= 0x21;
1362 
1363  status = ufx_reg_write(dev, 0x1000, tmp);
1364  check_warn_return(status, "error writing 0x1000");
1365 
1366  /* Set normal tx using target address 0 */
1367  status = ufx_reg_clear_and_set_bits(dev, 0x1004, 0xC00, 0x000);
1368  check_warn_return(status, "error setting TX mode bits in 0x1004");
1369 
1370  /* Enable the controller */
1371  status = ufx_reg_write(dev, 0x106C, 0x01);
1372  check_warn_return(status, "failed to enable I2C");
1373 
1374  return 0;
1375 }
1376 
1377 /* sets the I2C port mux and target address */
1378 static int ufx_i2c_configure(struct ufx_data *dev)
1379 {
1380  int status = ufx_reg_write(dev, 0x106C, 0x00);
1381  check_warn_return(status, "failed to disable I2C");
1382 
1383  status = ufx_reg_write(dev, 0x3010, 0x00000000);
1384  check_warn_return(status, "failed to write 0x3010");
1385 
1386  /* A0h is std for any EDID, right shifted by one */
1387  status = ufx_reg_clear_and_set_bits(dev, 0x1004, 0x3FF, (0xA0 >> 1));
1388  check_warn_return(status, "failed to set TAR bits in 0x1004");
1389 
1390  status = ufx_reg_write(dev, 0x106C, 0x01);
1391  check_warn_return(status, "failed to enable I2C");
1392 
1393  return 0;
1394 }
1395 
1396 /* wait for BUSY to clear, with a timeout of 50ms with 10ms sleeps. if no
1397  * monitor is connected, there is no error except for timeout */
1398 static int ufx_i2c_wait_busy(struct ufx_data *dev)
1399 {
1400  u32 tmp;
1401  int i, status;
1402 
1403  for (i = 0; i < 15; i++) {
1404  status = ufx_reg_read(dev, 0x1100, &tmp);
1405  check_warn_return(status, "0x1100 read failed");
1406 
1407  /* if BUSY is clear, check for error */
1408  if ((tmp & 0x80000000) == 0) {
1409  if (tmp & 0x20000000) {
1410  pr_warn("I2C read failed, 0x1100=0x%08x", tmp);
1411  return -EIO;
1412  }
1413 
1414  return 0;
1415  }
1416 
1417  /* perform the first 10 retries without delay */
1418  if (i >= 10)
1419  msleep(10);
1420  }
1421 
1422  pr_warn("I2C access timed out, resetting I2C hardware");
1423  status = ufx_reg_write(dev, 0x1100, 0x40000000);
1424  check_warn_return(status, "0x1100 write failed");
1425 
1426  return -ETIMEDOUT;
1427 }
1428 
1429 /* reads a 128-byte EDID block from the currently selected port and TAR */
1430 static int ufx_read_edid(struct ufx_data *dev, u8 *edid, int edid_len)
1431 {
1432  int i, j, status;
1433  u32 *edid_u32 = (u32 *)edid;
1434 
1435  BUG_ON(edid_len != EDID_LENGTH);
1436 
1437  status = ufx_i2c_configure(dev);
1438  if (status < 0) {
1439  pr_err("ufx_i2c_configure failed");
1440  return status;
1441  }
1442 
1443  memset(edid, 0xff, EDID_LENGTH);
1444 
1445  /* Read the 128-byte EDID as 2 bursts of 64 bytes */
1446  for (i = 0; i < 2; i++) {
1447  u32 temp = 0x28070000 | (63 << 20) | (((u32)(i * 64)) << 8);
1448  status = ufx_reg_write(dev, 0x1100, temp);
1449  check_warn_return(status, "Failed to write 0x1100");
1450 
1451  temp |= 0x80000000;
1452  status = ufx_reg_write(dev, 0x1100, temp);
1453  check_warn_return(status, "Failed to write 0x1100");
1454 
1455  status = ufx_i2c_wait_busy(dev);
1456  check_warn_return(status, "Timeout waiting for I2C BUSY to clear");
1457 
1458  for (j = 0; j < 16; j++) {
1459  u32 data_reg_addr = 0x1110 + (j * 4);
1460  status = ufx_reg_read(dev, data_reg_addr, edid_u32++);
1461  check_warn_return(status, "Error reading i2c data");
1462  }
1463  }
1464 
1465  /* all FF's in the first 16 bytes indicates nothing is connected */
1466  for (i = 0; i < 16; i++) {
1467  if (edid[i] != 0xFF) {
1468  pr_debug("edid data read successfully");
1469  return EDID_LENGTH;
1470  }
1471  }
1472 
1473  pr_warn("edid data contains all 0xff");
1474  return -ETIMEDOUT;
1475 }
1476 
1477 /* 1) use sw default
1478  * 2) Parse into various fb_info structs
1479  * 3) Allocate virtual framebuffer memory to back highest res mode
1480  *
1481  * Parses EDID into three places used by various parts of fbdev:
1482  * fb_var_screeninfo contains the timing of the monitor's preferred mode
1483  * fb_info.monspecs is full parsed EDID info, including monspecs.modedb
1484  * fb_info.modelist is a linked list of all monitor & VESA modes which work
1485  *
1486  * If EDID is not readable/valid, then modelist is all VESA modes,
1487  * monspecs is NULL, and fb_var_screeninfo is set to safe VESA mode
1488  * Returns 0 if successful */
1489 static int ufx_setup_modes(struct ufx_data *dev, struct fb_info *info,
1490  char *default_edid, size_t default_edid_size)
1491 {
1492  const struct fb_videomode *default_vmode = NULL;
1493  u8 *edid;
1494  int i, result = 0, tries = 3;
1495 
1496  if (info->dev) /* only use mutex if info has been registered */
1497  mutex_lock(&info->lock);
1498 
1499  edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
1500  if (!edid) {
1501  result = -ENOMEM;
1502  goto error;
1503  }
1504 
1505  fb_destroy_modelist(&info->modelist);
1506  memset(&info->monspecs, 0, sizeof(info->monspecs));
1507 
1508  /* Try to (re)read EDID from hardware first
1509  * EDID data may return, but not parse as valid
1510  * Try again a few times, in case of e.g. analog cable noise */
1511  while (tries--) {
1512  i = ufx_read_edid(dev, edid, EDID_LENGTH);
1513 
1514  if (i >= EDID_LENGTH)
1515  fb_edid_to_monspecs(edid, &info->monspecs);
1516 
1517  if (info->monspecs.modedb_len > 0) {
1518  dev->edid = edid;
1519  dev->edid_size = i;
1520  break;
1521  }
1522  }
1523 
1524  /* If that fails, use a previously returned EDID if available */
1525  if (info->monspecs.modedb_len == 0) {
1526  pr_err("Unable to get valid EDID from device/display\n");
1527 
1528  if (dev->edid) {
1529  fb_edid_to_monspecs(dev->edid, &info->monspecs);
1530  if (info->monspecs.modedb_len > 0)
1531  pr_err("Using previously queried EDID\n");
1532  }
1533  }
1534 
1535  /* If that fails, use the default EDID we were handed */
1536  if (info->monspecs.modedb_len == 0) {
1537  if (default_edid_size >= EDID_LENGTH) {
1538  fb_edid_to_monspecs(default_edid, &info->monspecs);
1539  if (info->monspecs.modedb_len > 0) {
1540  memcpy(edid, default_edid, default_edid_size);
1541  dev->edid = edid;
1542  dev->edid_size = default_edid_size;
1543  pr_err("Using default/backup EDID\n");
1544  }
1545  }
1546  }
1547 
1548  /* If we've got modes, let's pick a best default mode */
1549  if (info->monspecs.modedb_len > 0) {
1550 
1551  for (i = 0; i < info->monspecs.modedb_len; i++) {
1552  if (ufx_is_valid_mode(&info->monspecs.modedb[i], info))
1553  fb_add_videomode(&info->monspecs.modedb[i],
1554  &info->modelist);
1555  else /* if we've removed top/best mode */
1556  info->monspecs.misc &= ~FB_MISC_1ST_DETAIL;
1557  }
1558 
1559  default_vmode = fb_find_best_display(&info->monspecs,
1560  &info->modelist);
1561  }
1562 
1563  /* If everything else has failed, fall back to safe default mode */
1564  if (default_vmode == NULL) {
1565 
1566  struct fb_videomode fb_vmode = {0};
1567 
1568  /* Add the standard VESA modes to our modelist
1569  * Since we don't have EDID, there may be modes that
1570  * overspec monitor and/or are incorrect aspect ratio, etc.
1571  * But at least the user has a chance to choose
1572  */
1573  for (i = 0; i < VESA_MODEDB_SIZE; i++) {
1574  if (ufx_is_valid_mode((struct fb_videomode *)
1575  &vesa_modes[i], info))
1576  fb_add_videomode(&vesa_modes[i],
1577  &info->modelist);
1578  }
1579 
1580  /* default to resolution safe for projectors
1581  * (since they are most common case without EDID)
1582  */
1583  fb_vmode.xres = 800;
1584  fb_vmode.yres = 600;
1585  fb_vmode.refresh = 60;
1586  default_vmode = fb_find_nearest_mode(&fb_vmode,
1587  &info->modelist);
1588  }
1589 
1590  /* If we have good mode and no active clients */
1591  if ((default_vmode != NULL) && (dev->fb_count == 0)) {
1592 
1593  fb_videomode_to_var(&info->var, default_vmode);
1594  ufx_var_color_format(&info->var);
1595 
1596  /* with mode size info, we can now alloc our framebuffer */
1597  memcpy(&info->fix, &ufx_fix, sizeof(ufx_fix));
1598  info->fix.line_length = info->var.xres *
1599  (info->var.bits_per_pixel / 8);
1600 
1601  result = ufx_realloc_framebuffer(dev, info);
1602 
1603  } else
1604  result = -EINVAL;
1605 
1606 error:
1607  if (edid && (dev->edid != edid))
1608  kfree(edid);
1609 
1610  if (info->dev)
1611  mutex_unlock(&info->lock);
1612 
1613  return result;
1614 }
1615 
1616 static int ufx_usb_probe(struct usb_interface *interface,
1617  const struct usb_device_id *id)
1618 {
1619  struct usb_device *usbdev;
1620  struct ufx_data *dev;
1621  struct fb_info *info = 0;
1622  int retval = -ENOMEM;
1623  u32 id_rev, fpga_rev;
1624 
1625  /* usb initialization */
1626  usbdev = interface_to_usbdev(interface);
1627  BUG_ON(!usbdev);
1628 
1629  dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1630  if (dev == NULL) {
1631  dev_err(&usbdev->dev, "ufx_usb_probe: failed alloc of dev struct\n");
1632  goto error;
1633  }
1634 
1635  /* we need to wait for both usb and fbdev to spin down on disconnect */
1636  kref_init(&dev->kref); /* matching kref_put in usb .disconnect fn */
1637  kref_get(&dev->kref); /* matching kref_put in free_framebuffer_work */
1638 
1639  dev->udev = usbdev;
1640  dev->gdev = &usbdev->dev; /* our generic struct device * */
1641  usb_set_intfdata(interface, dev);
1642 
1643  dev_dbg(dev->gdev, "%s %s - serial #%s\n",
1644  usbdev->manufacturer, usbdev->product, usbdev->serial);
1645  dev_dbg(dev->gdev, "vid_%04x&pid_%04x&rev_%04x driver's ufx_data struct at %p\n",
1646  usbdev->descriptor.idVendor, usbdev->descriptor.idProduct,
1647  usbdev->descriptor.bcdDevice, dev);
1648  dev_dbg(dev->gdev, "console enable=%d\n", console);
1649  dev_dbg(dev->gdev, "fb_defio enable=%d\n", fb_defio);
1650 
1651  if (!ufx_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
1652  retval = -ENOMEM;
1653  dev_err(dev->gdev, "ufx_alloc_urb_list failed\n");
1654  goto error;
1655  }
1656 
1657  /* We don't register a new USB class. Our client interface is fbdev */
1658 
1659  /* allocates framebuffer driver structure, not framebuffer memory */
1660  info = framebuffer_alloc(0, &usbdev->dev);
1661  if (!info) {
1662  retval = -ENOMEM;
1663  dev_err(dev->gdev, "framebuffer_alloc failed\n");
1664  goto error;
1665  }
1666 
1667  dev->info = info;
1668  info->par = dev;
1669  info->pseudo_palette = dev->pseudo_palette;
1670  info->fbops = &ufx_ops;
1671 
1672  retval = fb_alloc_cmap(&info->cmap, 256, 0);
1673  if (retval < 0) {
1674  dev_err(dev->gdev, "fb_alloc_cmap failed %x\n", retval);
1675  goto error;
1676  }
1677 
1679  ufx_free_framebuffer_work);
1680 
1681  INIT_LIST_HEAD(&info->modelist);
1682 
1683  retval = ufx_reg_read(dev, 0x3000, &id_rev);
1684  check_warn_goto_error(retval, "error %d reading 0x3000 register from device", retval);
1685  dev_dbg(dev->gdev, "ID_REV register value 0x%08x", id_rev);
1686 
1687  retval = ufx_reg_read(dev, 0x3004, &fpga_rev);
1688  check_warn_goto_error(retval, "error %d reading 0x3004 register from device", retval);
1689  dev_dbg(dev->gdev, "FPGA_REV register value 0x%08x", fpga_rev);
1690 
1691  dev_dbg(dev->gdev, "resetting device");
1692  retval = ufx_lite_reset(dev);
1693  check_warn_goto_error(retval, "error %d resetting device", retval);
1694 
1695  dev_dbg(dev->gdev, "configuring system clock");
1696  retval = ufx_config_sys_clk(dev);
1697  check_warn_goto_error(retval, "error %d configuring system clock", retval);
1698 
1699  dev_dbg(dev->gdev, "configuring DDR2 controller");
1700  retval = ufx_config_ddr2(dev);
1701  check_warn_goto_error(retval, "error %d initialising DDR2 controller", retval);
1702 
1703  dev_dbg(dev->gdev, "configuring I2C controller");
1704  retval = ufx_i2c_init(dev);
1705  check_warn_goto_error(retval, "error %d initialising I2C controller", retval);
1706 
1707  dev_dbg(dev->gdev, "selecting display mode");
1708  retval = ufx_setup_modes(dev, info, NULL, 0);
1709  check_warn_goto_error(retval, "unable to find common mode for display and adapter");
1710 
1711  retval = ufx_reg_set_bits(dev, 0x4000, 0x00000001);
1712  check_warn_goto_error(retval, "error %d enabling graphics engine", retval);
1713 
1714  /* ready to begin using device */
1715  atomic_set(&dev->usb_active, 1);
1716 
1717  dev_dbg(dev->gdev, "checking var");
1718  retval = ufx_ops_check_var(&info->var, info);
1719  check_warn_goto_error(retval, "error %d ufx_ops_check_var", retval);
1720 
1721  dev_dbg(dev->gdev, "setting par");
1722  retval = ufx_ops_set_par(info);
1723  check_warn_goto_error(retval, "error %d ufx_ops_set_par", retval);
1724 
1725  dev_dbg(dev->gdev, "registering framebuffer");
1726  retval = register_framebuffer(info);
1727  check_warn_goto_error(retval, "error %d register_framebuffer", retval);
1728 
1729  dev_info(dev->gdev, "SMSC UDX USB device /dev/fb%d attached. %dx%d resolution."
1730  " Using %dK framebuffer memory\n", info->node,
1731  info->var.xres, info->var.yres, info->fix.smem_len >> 10);
1732 
1733  return 0;
1734 
1735 error:
1736  if (dev) {
1737  if (info) {
1738  if (info->cmap.len != 0)
1739  fb_dealloc_cmap(&info->cmap);
1740  if (info->monspecs.modedb)
1741  fb_destroy_modedb(info->monspecs.modedb);
1742  if (info->screen_base)
1743  vfree(info->screen_base);
1744 
1745  fb_destroy_modelist(&info->modelist);
1746 
1747  framebuffer_release(info);
1748  }
1749 
1750  kref_put(&dev->kref, ufx_free); /* ref for framebuffer */
1751  kref_put(&dev->kref, ufx_free); /* last ref from kref_init */
1752 
1753  /* dev has been deallocated. Do not dereference */
1754  }
1755 
1756  return retval;
1757 }
1758 
1759 static void ufx_usb_disconnect(struct usb_interface *interface)
1760 {
1761  struct ufx_data *dev;
1762  struct fb_info *info;
1763 
1764  dev = usb_get_intfdata(interface);
1765  info = dev->info;
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)
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)
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(struct urb_node), GFP_KERNEL);
1878  if (!unode)
1879  break;
1880  unode->dev = dev;
1881 
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 
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 <[email protected]>");
1975 MODULE_DESCRIPTION("SMSC UFX kernel framebuffer driver");
1976 MODULE_LICENSE("GPL");