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usbvision-core.c
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1 /*
2  * usbvision-core.c - driver for NT100x USB video capture devices
3  *
4  *
5  * Copyright (c) 1999-2005 Joerg Heckenbach <[email protected]>
6  * Dwaine Garden <[email protected]>
7  *
8  * This module is part of usbvision driver project.
9  * Updates to driver completed by Dwaine P. Garden
10  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License as published by
13  * the Free Software Foundation; either version 2 of the License, or
14  * (at your option) any later version.
15  *
16  * This program is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19  * GNU General Public License for more details.
20  *
21  * You should have received a copy of the GNU General Public License
22  * along with this program; if not, write to the Free Software
23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24  */
25 
26 #include <linux/kernel.h>
27 #include <linux/list.h>
28 #include <linux/timer.h>
29 #include <linux/gfp.h>
30 #include <linux/mm.h>
31 #include <linux/highmem.h>
32 #include <linux/vmalloc.h>
33 #include <linux/module.h>
34 #include <linux/init.h>
35 #include <linux/spinlock.h>
36 #include <linux/io.h>
37 #include <linux/videodev2.h>
38 #include <linux/i2c.h>
39 
40 #include <media/saa7115.h>
41 #include <media/v4l2-common.h>
42 #include <media/tuner.h>
43 
44 #include <linux/workqueue.h>
45 
46 #include "usbvision.h"
47 
48 static unsigned int core_debug;
49 module_param(core_debug, int, 0644);
50 MODULE_PARM_DESC(core_debug, "enable debug messages [core]");
51 
52 static int adjust_compression = 1; /* Set the compression to be adaptive */
53 module_param(adjust_compression, int, 0444);
54 MODULE_PARM_DESC(adjust_compression, " Set the ADPCM compression for the device. Default: 1 (On)");
55 
56 /* To help people with Black and White output with using s-video input.
57  * Some cables and input device are wired differently. */
58 static int switch_svideo_input;
59 module_param(switch_svideo_input, int, 0444);
60 MODULE_PARM_DESC(switch_svideo_input, " Set the S-Video input. Some cables and input device are wired differently. Default: 0 (Off)");
61 
62 static unsigned int adjust_x_offset = -1;
63 module_param(adjust_x_offset, int, 0644);
64 MODULE_PARM_DESC(adjust_x_offset, "adjust X offset display [core]");
65 
66 static unsigned int adjust_y_offset = -1;
67 module_param(adjust_y_offset, int, 0644);
68 MODULE_PARM_DESC(adjust_y_offset, "adjust Y offset display [core]");
69 
70 
71 #define ENABLE_HEXDUMP 0 /* Enable if you need it */
72 
73 
74 #ifdef USBVISION_DEBUG
75  #define PDEBUG(level, fmt, args...) { \
76  if (core_debug & (level)) \
77  printk(KERN_INFO KBUILD_MODNAME ":[%s:%d] " fmt, \
78  __func__, __LINE__ , ## args); \
79  }
80 #else
81  #define PDEBUG(level, fmt, args...) do {} while (0)
82 #endif
83 
84 #define DBG_HEADER (1 << 0)
85 #define DBG_IRQ (1 << 1)
86 #define DBG_ISOC (1 << 2)
87 #define DBG_PARSE (1 << 3)
88 #define DBG_SCRATCH (1 << 4)
89 #define DBG_FUNC (1 << 5)
90 
91 static const int max_imgwidth = MAX_FRAME_WIDTH;
92 static const int max_imgheight = MAX_FRAME_HEIGHT;
93 static const int min_imgwidth = MIN_FRAME_WIDTH;
94 static const int min_imgheight = MIN_FRAME_HEIGHT;
95 
96 /* The value of 'scratch_buf_size' affects quality of the picture
97  * in many ways. Shorter buffers may cause loss of data when client
98  * is too slow. Larger buffers are memory-consuming and take longer
99  * to work with. This setting can be adjusted, but the default value
100  * should be OK for most desktop users.
101  */
102 #define DEFAULT_SCRATCH_BUF_SIZE (0x20000) /* 128kB memory scratch buffer */
103 static const int scratch_buf_size = DEFAULT_SCRATCH_BUF_SIZE;
104 
105 /* Function prototypes */
106 static int usbvision_request_intra(struct usb_usbvision *usbvision);
107 static int usbvision_unrequest_intra(struct usb_usbvision *usbvision);
108 static int usbvision_adjust_compression(struct usb_usbvision *usbvision);
109 static int usbvision_measure_bandwidth(struct usb_usbvision *usbvision);
110 
111 /*******************************/
112 /* Memory management functions */
113 /*******************************/
114 
115 /*
116  * Here we want the physical address of the memory.
117  * This is used when initializing the contents of the area.
118  */
119 
120 static void *usbvision_rvmalloc(unsigned long size)
121 {
122  void *mem;
123  unsigned long adr;
124 
125  size = PAGE_ALIGN(size);
126  mem = vmalloc_32(size);
127  if (!mem)
128  return NULL;
129 
130  memset(mem, 0, size); /* Clear the ram out, no junk to the user */
131  adr = (unsigned long) mem;
132  while (size > 0) {
133  SetPageReserved(vmalloc_to_page((void *)adr));
134  adr += PAGE_SIZE;
135  size -= PAGE_SIZE;
136  }
137 
138  return mem;
139 }
140 
141 static void usbvision_rvfree(void *mem, unsigned long size)
142 {
143  unsigned long adr;
144 
145  if (!mem)
146  return;
147 
148  size = PAGE_ALIGN(size);
149 
150  adr = (unsigned long) mem;
151  while ((long) size > 0) {
152  ClearPageReserved(vmalloc_to_page((void *)adr));
153  adr += PAGE_SIZE;
154  size -= PAGE_SIZE;
155  }
156 
157  vfree(mem);
158 }
159 
160 
161 #if ENABLE_HEXDUMP
162 static void usbvision_hexdump(const unsigned char *data, int len)
163 {
164  char tmp[80];
165  int i, k;
166 
167  for (i = k = 0; len > 0; i++, len--) {
168  if (i > 0 && (i % 16 == 0)) {
169  printk("%s\n", tmp);
170  k = 0;
171  }
172  k += sprintf(&tmp[k], "%02x ", data[i]);
173  }
174  if (k > 0)
175  printk(KERN_CONT "%s\n", tmp);
176 }
177 #endif
178 
179 /********************************
180  * scratch ring buffer handling
181  ********************************/
182 static int scratch_len(struct usb_usbvision *usbvision) /* This returns the amount of data actually in the buffer */
183 {
184  int len = usbvision->scratch_write_ptr - usbvision->scratch_read_ptr;
185 
186  if (len < 0)
187  len += scratch_buf_size;
188  PDEBUG(DBG_SCRATCH, "scratch_len() = %d\n", len);
189 
190  return len;
191 }
192 
193 
194 /* This returns the free space left in the buffer */
195 static int scratch_free(struct usb_usbvision *usbvision)
196 {
197  int free = usbvision->scratch_read_ptr - usbvision->scratch_write_ptr;
198  if (free <= 0)
199  free += scratch_buf_size;
200  if (free) {
201  free -= 1; /* at least one byte in the buffer must */
202  /* left blank, otherwise there is no chance to differ between full and empty */
203  }
204  PDEBUG(DBG_SCRATCH, "return %d\n", free);
205 
206  return free;
207 }
208 
209 
210 /* This puts data into the buffer */
211 static int scratch_put(struct usb_usbvision *usbvision, unsigned char *data,
212  int len)
213 {
214  int len_part;
215 
216  if (usbvision->scratch_write_ptr + len < scratch_buf_size) {
217  memcpy(usbvision->scratch + usbvision->scratch_write_ptr, data, len);
218  usbvision->scratch_write_ptr += len;
219  } else {
220  len_part = scratch_buf_size - usbvision->scratch_write_ptr;
221  memcpy(usbvision->scratch + usbvision->scratch_write_ptr, data, len_part);
222  if (len == len_part) {
223  usbvision->scratch_write_ptr = 0; /* just set write_ptr to zero */
224  } else {
225  memcpy(usbvision->scratch, data + len_part, len - len_part);
226  usbvision->scratch_write_ptr = len - len_part;
227  }
228  }
229 
230  PDEBUG(DBG_SCRATCH, "len=%d, new write_ptr=%d\n", len, usbvision->scratch_write_ptr);
231 
232  return len;
233 }
234 
235 /* This marks the write_ptr as position of new frame header */
236 static void scratch_mark_header(struct usb_usbvision *usbvision)
237 {
238  PDEBUG(DBG_SCRATCH, "header at write_ptr=%d\n", usbvision->scratch_headermarker_write_ptr);
239 
240  usbvision->scratch_headermarker[usbvision->scratch_headermarker_write_ptr] =
241  usbvision->scratch_write_ptr;
242  usbvision->scratch_headermarker_write_ptr += 1;
243  usbvision->scratch_headermarker_write_ptr %= USBVISION_NUM_HEADERMARKER;
244 }
245 
246 /* This gets data from the buffer at the given "ptr" position */
247 static int scratch_get_extra(struct usb_usbvision *usbvision,
248  unsigned char *data, int *ptr, int len)
249 {
250  int len_part;
251 
252  if (*ptr + len < scratch_buf_size) {
253  memcpy(data, usbvision->scratch + *ptr, len);
254  *ptr += len;
255  } else {
256  len_part = scratch_buf_size - *ptr;
257  memcpy(data, usbvision->scratch + *ptr, len_part);
258  if (len == len_part) {
259  *ptr = 0; /* just set the y_ptr to zero */
260  } else {
261  memcpy(data + len_part, usbvision->scratch, len - len_part);
262  *ptr = len - len_part;
263  }
264  }
265 
266  PDEBUG(DBG_SCRATCH, "len=%d, new ptr=%d\n", len, *ptr);
267 
268  return len;
269 }
270 
271 
272 /* This sets the scratch extra read pointer */
273 static void scratch_set_extra_ptr(struct usb_usbvision *usbvision, int *ptr,
274  int len)
275 {
276  *ptr = (usbvision->scratch_read_ptr + len) % scratch_buf_size;
277 
278  PDEBUG(DBG_SCRATCH, "ptr=%d\n", *ptr);
279 }
280 
281 
282 /* This increments the scratch extra read pointer */
283 static void scratch_inc_extra_ptr(int *ptr, int len)
284 {
285  *ptr = (*ptr + len) % scratch_buf_size;
286 
287  PDEBUG(DBG_SCRATCH, "ptr=%d\n", *ptr);
288 }
289 
290 
291 /* This gets data from the buffer */
292 static int scratch_get(struct usb_usbvision *usbvision, unsigned char *data,
293  int len)
294 {
295  int len_part;
296 
297  if (usbvision->scratch_read_ptr + len < scratch_buf_size) {
298  memcpy(data, usbvision->scratch + usbvision->scratch_read_ptr, len);
299  usbvision->scratch_read_ptr += len;
300  } else {
301  len_part = scratch_buf_size - usbvision->scratch_read_ptr;
302  memcpy(data, usbvision->scratch + usbvision->scratch_read_ptr, len_part);
303  if (len == len_part) {
304  usbvision->scratch_read_ptr = 0; /* just set the read_ptr to zero */
305  } else {
306  memcpy(data + len_part, usbvision->scratch, len - len_part);
307  usbvision->scratch_read_ptr = len - len_part;
308  }
309  }
310 
311  PDEBUG(DBG_SCRATCH, "len=%d, new read_ptr=%d\n", len, usbvision->scratch_read_ptr);
312 
313  return len;
314 }
315 
316 
317 /* This sets read pointer to next header and returns it */
318 static int scratch_get_header(struct usb_usbvision *usbvision,
319  struct usbvision_frame_header *header)
320 {
321  int err_code = 0;
322 
323  PDEBUG(DBG_SCRATCH, "from read_ptr=%d", usbvision->scratch_headermarker_read_ptr);
324 
325  while (usbvision->scratch_headermarker_write_ptr -
326  usbvision->scratch_headermarker_read_ptr != 0) {
327  usbvision->scratch_read_ptr =
328  usbvision->scratch_headermarker[usbvision->scratch_headermarker_read_ptr];
329  usbvision->scratch_headermarker_read_ptr += 1;
330  usbvision->scratch_headermarker_read_ptr %= USBVISION_NUM_HEADERMARKER;
331  scratch_get(usbvision, (unsigned char *)header, USBVISION_HEADER_LENGTH);
332  if ((header->magic_1 == USBVISION_MAGIC_1)
333  && (header->magic_2 == USBVISION_MAGIC_2)
334  && (header->header_length == USBVISION_HEADER_LENGTH)) {
335  err_code = USBVISION_HEADER_LENGTH;
336  header->frame_width = header->frame_width_lo + (header->frame_width_hi << 8);
337  header->frame_height = header->frame_height_lo + (header->frame_height_hi << 8);
338  break;
339  }
340  }
341 
342  return err_code;
343 }
344 
345 
346 /* This removes len bytes of old data from the buffer */
347 static void scratch_rm_old(struct usb_usbvision *usbvision, int len)
348 {
349  usbvision->scratch_read_ptr += len;
350  usbvision->scratch_read_ptr %= scratch_buf_size;
351  PDEBUG(DBG_SCRATCH, "read_ptr is now %d\n", usbvision->scratch_read_ptr);
352 }
353 
354 
355 /* This resets the buffer - kills all data in it too */
356 static void scratch_reset(struct usb_usbvision *usbvision)
357 {
358  PDEBUG(DBG_SCRATCH, "\n");
359 
360  usbvision->scratch_read_ptr = 0;
361  usbvision->scratch_write_ptr = 0;
362  usbvision->scratch_headermarker_read_ptr = 0;
363  usbvision->scratch_headermarker_write_ptr = 0;
364  usbvision->isocstate = isoc_state_no_frame;
365 }
366 
367 int usbvision_scratch_alloc(struct usb_usbvision *usbvision)
368 {
369  usbvision->scratch = vmalloc_32(scratch_buf_size);
370  scratch_reset(usbvision);
371  if (usbvision->scratch == NULL) {
372  dev_err(&usbvision->dev->dev,
373  "%s: unable to allocate %d bytes for scratch\n",
374  __func__, scratch_buf_size);
375  return -ENOMEM;
376  }
377  return 0;
378 }
379 
380 void usbvision_scratch_free(struct usb_usbvision *usbvision)
381 {
382  vfree(usbvision->scratch);
383  usbvision->scratch = NULL;
384 }
385 
386 /*
387  * usbvision_decompress_alloc()
388  *
389  * allocates intermediate buffer for decompression
390  */
391 int usbvision_decompress_alloc(struct usb_usbvision *usbvision)
392 {
393  int IFB_size = MAX_FRAME_WIDTH * MAX_FRAME_HEIGHT * 3 / 2;
394 
395  usbvision->intra_frame_buffer = vmalloc_32(IFB_size);
396  if (usbvision->intra_frame_buffer == NULL) {
397  dev_err(&usbvision->dev->dev,
398  "%s: unable to allocate %d for compr. frame buffer\n",
399  __func__, IFB_size);
400  return -ENOMEM;
401  }
402  return 0;
403 }
404 
405 /*
406  * usbvision_decompress_free()
407  *
408  * frees intermediate buffer for decompression
409  */
410 void usbvision_decompress_free(struct usb_usbvision *usbvision)
411 {
412  vfree(usbvision->intra_frame_buffer);
413  usbvision->intra_frame_buffer = NULL;
414 
415 }
416 
417 /************************************************************
418  * Here comes the data parsing stuff that is run as interrupt
419  ************************************************************/
420 /*
421  * usbvision_find_header()
422  *
423  * Locate one of supported header markers in the scratch buffer.
424  */
425 static enum parse_state usbvision_find_header(struct usb_usbvision *usbvision)
426 {
427  struct usbvision_frame *frame;
428  int found_header = 0;
429 
430  frame = usbvision->cur_frame;
431 
432  while (scratch_get_header(usbvision, &frame->isoc_header) == USBVISION_HEADER_LENGTH) {
433  /* found header in scratch */
434  PDEBUG(DBG_HEADER, "found header: 0x%02x%02x %d %d %d %d %#x 0x%02x %u %u",
435  frame->isoc_header.magic_2,
436  frame->isoc_header.magic_1,
437  frame->isoc_header.header_length,
438  frame->isoc_header.frame_num,
439  frame->isoc_header.frame_phase,
440  frame->isoc_header.frame_latency,
441  frame->isoc_header.data_format,
442  frame->isoc_header.format_param,
443  frame->isoc_header.frame_width,
444  frame->isoc_header.frame_height);
445 
446  if (usbvision->request_intra) {
447  if (frame->isoc_header.format_param & 0x80) {
448  found_header = 1;
449  usbvision->last_isoc_frame_num = -1; /* do not check for lost frames this time */
450  usbvision_unrequest_intra(usbvision);
451  break;
452  }
453  } else {
454  found_header = 1;
455  break;
456  }
457  }
458 
459  if (found_header) {
460  frame->frmwidth = frame->isoc_header.frame_width * usbvision->stretch_width;
461  frame->frmheight = frame->isoc_header.frame_height * usbvision->stretch_height;
462  frame->v4l2_linesize = (frame->frmwidth * frame->v4l2_format.depth) >> 3;
463  } else { /* no header found */
464  PDEBUG(DBG_HEADER, "skipping scratch data, no header");
465  scratch_reset(usbvision);
466  return parse_state_end_parse;
467  }
468 
469  /* found header */
470  if (frame->isoc_header.data_format == ISOC_MODE_COMPRESS) {
471  /* check isoc_header.frame_num for lost frames */
472  if (usbvision->last_isoc_frame_num >= 0) {
473  if (((usbvision->last_isoc_frame_num + 1) % 32) != frame->isoc_header.frame_num) {
474  /* unexpected frame drop: need to request new intra frame */
475  PDEBUG(DBG_HEADER, "Lost frame before %d on USB", frame->isoc_header.frame_num);
476  usbvision_request_intra(usbvision);
477  return parse_state_next_frame;
478  }
479  }
480  usbvision->last_isoc_frame_num = frame->isoc_header.frame_num;
481  }
482  usbvision->header_count++;
483  frame->scanstate = scan_state_lines;
484  frame->curline = 0;
485 
486  return parse_state_continue;
487 }
488 
489 static enum parse_state usbvision_parse_lines_422(struct usb_usbvision *usbvision,
490  long *pcopylen)
491 {
492  volatile struct usbvision_frame *frame;
493  unsigned char *f;
494  int len;
495  int i;
496  unsigned char yuyv[4] = { 180, 128, 10, 128 }; /* YUV components */
497  unsigned char rv, gv, bv; /* RGB components */
498  int clipmask_index, bytes_per_pixel;
499  int stretch_bytes, clipmask_add;
500 
501  frame = usbvision->cur_frame;
502  f = frame->data + (frame->v4l2_linesize * frame->curline);
503 
504  /* Make sure there's enough data for the entire line */
505  len = (frame->isoc_header.frame_width * 2) + 5;
506  if (scratch_len(usbvision) < len) {
507  PDEBUG(DBG_PARSE, "out of data in line %d, need %u.\n", frame->curline, len);
508  return parse_state_out;
509  }
510 
511  if ((frame->curline + 1) >= frame->frmheight)
512  return parse_state_next_frame;
513 
514  bytes_per_pixel = frame->v4l2_format.bytes_per_pixel;
515  stretch_bytes = (usbvision->stretch_width - 1) * bytes_per_pixel;
516  clipmask_index = frame->curline * MAX_FRAME_WIDTH;
517  clipmask_add = usbvision->stretch_width;
518 
519  for (i = 0; i < frame->frmwidth; i += (2 * usbvision->stretch_width)) {
520  scratch_get(usbvision, &yuyv[0], 4);
521 
522  if (frame->v4l2_format.format == V4L2_PIX_FMT_YUYV) {
523  *f++ = yuyv[0]; /* Y */
524  *f++ = yuyv[3]; /* U */
525  } else {
526  YUV_TO_RGB_BY_THE_BOOK(yuyv[0], yuyv[1], yuyv[3], rv, gv, bv);
527  switch (frame->v4l2_format.format) {
528  case V4L2_PIX_FMT_RGB565:
529  *f++ = (0x1F & rv) |
530  (0xE0 & (gv << 5));
531  *f++ = (0x07 & (gv >> 3)) |
532  (0xF8 & bv);
533  break;
534  case V4L2_PIX_FMT_RGB24:
535  *f++ = rv;
536  *f++ = gv;
537  *f++ = bv;
538  break;
539  case V4L2_PIX_FMT_RGB32:
540  *f++ = rv;
541  *f++ = gv;
542  *f++ = bv;
543  f++;
544  break;
545  case V4L2_PIX_FMT_RGB555:
546  *f++ = (0x1F & rv) |
547  (0xE0 & (gv << 5));
548  *f++ = (0x03 & (gv >> 3)) |
549  (0x7C & (bv << 2));
550  break;
551  }
552  }
553  clipmask_index += clipmask_add;
554  f += stretch_bytes;
555 
556  if (frame->v4l2_format.format == V4L2_PIX_FMT_YUYV) {
557  *f++ = yuyv[2]; /* Y */
558  *f++ = yuyv[1]; /* V */
559  } else {
560  YUV_TO_RGB_BY_THE_BOOK(yuyv[2], yuyv[1], yuyv[3], rv, gv, bv);
561  switch (frame->v4l2_format.format) {
562  case V4L2_PIX_FMT_RGB565:
563  *f++ = (0x1F & rv) |
564  (0xE0 & (gv << 5));
565  *f++ = (0x07 & (gv >> 3)) |
566  (0xF8 & bv);
567  break;
568  case V4L2_PIX_FMT_RGB24:
569  *f++ = rv;
570  *f++ = gv;
571  *f++ = bv;
572  break;
573  case V4L2_PIX_FMT_RGB32:
574  *f++ = rv;
575  *f++ = gv;
576  *f++ = bv;
577  f++;
578  break;
579  case V4L2_PIX_FMT_RGB555:
580  *f++ = (0x1F & rv) |
581  (0xE0 & (gv << 5));
582  *f++ = (0x03 & (gv >> 3)) |
583  (0x7C & (bv << 2));
584  break;
585  }
586  }
587  clipmask_index += clipmask_add;
588  f += stretch_bytes;
589  }
590 
591  frame->curline += usbvision->stretch_height;
592  *pcopylen += frame->v4l2_linesize * usbvision->stretch_height;
593 
594  if (frame->curline >= frame->frmheight)
595  return parse_state_next_frame;
596  return parse_state_continue;
597 }
598 
599 /* The decompression routine */
600 static int usbvision_decompress(struct usb_usbvision *usbvision, unsigned char *compressed,
601  unsigned char *decompressed, int *start_pos,
602  int *block_typestart_pos, int len)
603 {
604  int rest_pixel, idx, pos, extra_pos, block_len, block_type_pos, block_type_len;
605  unsigned char block_byte, block_code, block_type, block_type_byte, integrator;
606 
607  integrator = 0;
608  pos = *start_pos;
609  block_type_pos = *block_typestart_pos;
610  extra_pos = pos;
611  block_len = 0;
612  block_byte = 0;
613  block_code = 0;
614  block_type = 0;
615  block_type_byte = 0;
616  block_type_len = 0;
617  rest_pixel = len;
618 
619  for (idx = 0; idx < len; idx++) {
620  if (block_len == 0) {
621  if (block_type_len == 0) {
622  block_type_byte = compressed[block_type_pos];
623  block_type_pos++;
624  block_type_len = 4;
625  }
626  block_type = (block_type_byte & 0xC0) >> 6;
627 
628  /* statistic: */
629  usbvision->compr_block_types[block_type]++;
630 
631  pos = extra_pos;
632  if (block_type == 0) {
633  if (rest_pixel >= 24) {
634  idx += 23;
635  rest_pixel -= 24;
636  integrator = decompressed[idx];
637  } else {
638  idx += rest_pixel - 1;
639  rest_pixel = 0;
640  }
641  } else {
642  block_code = compressed[pos];
643  pos++;
644  if (rest_pixel >= 24)
645  block_len = 24;
646  else
647  block_len = rest_pixel;
648  rest_pixel -= block_len;
649  extra_pos = pos + (block_len / 4);
650  }
651  block_type_byte <<= 2;
652  block_type_len -= 1;
653  }
654  if (block_len > 0) {
655  if ((block_len % 4) == 0) {
656  block_byte = compressed[pos];
657  pos++;
658  }
659  if (block_type == 1) /* inter Block */
660  integrator = decompressed[idx];
661  switch (block_byte & 0xC0) {
662  case 0x03 << 6:
663  integrator += compressed[extra_pos];
664  extra_pos++;
665  break;
666  case 0x02 << 6:
667  integrator += block_code;
668  break;
669  case 0x00:
670  integrator -= block_code;
671  break;
672  }
673  decompressed[idx] = integrator;
674  block_byte <<= 2;
675  block_len -= 1;
676  }
677  }
678  *start_pos = extra_pos;
679  *block_typestart_pos = block_type_pos;
680  return idx;
681 }
682 
683 
684 /*
685  * usbvision_parse_compress()
686  *
687  * Parse compressed frame from the scratch buffer, put
688  * decoded RGB value into the current frame buffer and add the written
689  * number of bytes (RGB) to the *pcopylen.
690  *
691  */
692 static enum parse_state usbvision_parse_compress(struct usb_usbvision *usbvision,
693  long *pcopylen)
694 {
695 #define USBVISION_STRIP_MAGIC 0x5A
696 #define USBVISION_STRIP_LEN_MAX 400
697 #define USBVISION_STRIP_HEADER_LEN 3
698 
699  struct usbvision_frame *frame;
700  unsigned char *f, *u = NULL, *v = NULL;
701  unsigned char strip_data[USBVISION_STRIP_LEN_MAX];
702  unsigned char strip_header[USBVISION_STRIP_HEADER_LEN];
703  int idx, idx_end, strip_len, strip_ptr, startblock_pos, block_pos, block_type_pos;
704  int clipmask_index;
705  int image_size;
706  unsigned char rv, gv, bv;
707  static unsigned char *Y, *U, *V;
708 
709  frame = usbvision->cur_frame;
710  image_size = frame->frmwidth * frame->frmheight;
711  if ((frame->v4l2_format.format == V4L2_PIX_FMT_YUV422P) ||
712  (frame->v4l2_format.format == V4L2_PIX_FMT_YVU420)) { /* this is a planar format */
713  /* ... v4l2_linesize not used here. */
714  f = frame->data + (frame->width * frame->curline);
715  } else
716  f = frame->data + (frame->v4l2_linesize * frame->curline);
717 
718  if (frame->v4l2_format.format == V4L2_PIX_FMT_YUYV) { /* initialise u and v pointers */
719  /* get base of u and b planes add halfoffset */
720  u = frame->data
721  + image_size
722  + (frame->frmwidth >> 1) * frame->curline;
723  v = u + (image_size >> 1);
724  } else if (frame->v4l2_format.format == V4L2_PIX_FMT_YVU420) {
725  v = frame->data + image_size + ((frame->curline * (frame->width)) >> 2);
726  u = v + (image_size >> 2);
727  }
728 
729  if (frame->curline == 0)
730  usbvision_adjust_compression(usbvision);
731 
732  if (scratch_len(usbvision) < USBVISION_STRIP_HEADER_LEN)
733  return parse_state_out;
734 
735  /* get strip header without changing the scratch_read_ptr */
736  scratch_set_extra_ptr(usbvision, &strip_ptr, 0);
737  scratch_get_extra(usbvision, &strip_header[0], &strip_ptr,
738  USBVISION_STRIP_HEADER_LEN);
739 
740  if (strip_header[0] != USBVISION_STRIP_MAGIC) {
741  /* wrong strip magic */
742  usbvision->strip_magic_errors++;
743  return parse_state_next_frame;
744  }
745 
746  if (frame->curline != (int)strip_header[2]) {
747  /* line number mismatch error */
748  usbvision->strip_line_number_errors++;
749  }
750 
751  strip_len = 2 * (unsigned int)strip_header[1];
752  if (strip_len > USBVISION_STRIP_LEN_MAX) {
753  /* strip overrun */
754  /* I think this never happens */
755  usbvision_request_intra(usbvision);
756  }
757 
758  if (scratch_len(usbvision) < strip_len) {
759  /* there is not enough data for the strip */
760  return parse_state_out;
761  }
762 
763  if (usbvision->intra_frame_buffer) {
764  Y = usbvision->intra_frame_buffer + frame->frmwidth * frame->curline;
765  U = usbvision->intra_frame_buffer + image_size + (frame->frmwidth / 2) * (frame->curline / 2);
766  V = usbvision->intra_frame_buffer + image_size / 4 * 5 + (frame->frmwidth / 2) * (frame->curline / 2);
767  } else {
768  return parse_state_next_frame;
769  }
770 
771  clipmask_index = frame->curline * MAX_FRAME_WIDTH;
772 
773  scratch_get(usbvision, strip_data, strip_len);
774 
775  idx_end = frame->frmwidth;
776  block_type_pos = USBVISION_STRIP_HEADER_LEN;
777  startblock_pos = block_type_pos + (idx_end - 1) / 96 + (idx_end / 2 - 1) / 96 + 2;
778  block_pos = startblock_pos;
779 
780  usbvision->block_pos = block_pos;
781 
782  usbvision_decompress(usbvision, strip_data, Y, &block_pos, &block_type_pos, idx_end);
783  if (strip_len > usbvision->max_strip_len)
784  usbvision->max_strip_len = strip_len;
785 
786  if (frame->curline % 2)
787  usbvision_decompress(usbvision, strip_data, V, &block_pos, &block_type_pos, idx_end / 2);
788  else
789  usbvision_decompress(usbvision, strip_data, U, &block_pos, &block_type_pos, idx_end / 2);
790 
791  if (block_pos > usbvision->comprblock_pos)
792  usbvision->comprblock_pos = block_pos;
793  if (block_pos > strip_len)
794  usbvision->strip_len_errors++;
795 
796  for (idx = 0; idx < idx_end; idx++) {
797  if (frame->v4l2_format.format == V4L2_PIX_FMT_YUYV) {
798  *f++ = Y[idx];
799  *f++ = idx & 0x01 ? U[idx / 2] : V[idx / 2];
800  } else if (frame->v4l2_format.format == V4L2_PIX_FMT_YUV422P) {
801  *f++ = Y[idx];
802  if (idx & 0x01)
803  *u++ = U[idx >> 1];
804  else
805  *v++ = V[idx >> 1];
806  } else if (frame->v4l2_format.format == V4L2_PIX_FMT_YVU420) {
807  *f++ = Y[idx];
808  if (!((idx & 0x01) | (frame->curline & 0x01))) {
809  /* only need do this for 1 in 4 pixels */
810  /* intraframe buffer is YUV420 format */
811  *u++ = U[idx >> 1];
812  *v++ = V[idx >> 1];
813  }
814  } else {
815  YUV_TO_RGB_BY_THE_BOOK(Y[idx], U[idx / 2], V[idx / 2], rv, gv, bv);
816  switch (frame->v4l2_format.format) {
817  case V4L2_PIX_FMT_GREY:
818  *f++ = Y[idx];
819  break;
820  case V4L2_PIX_FMT_RGB555:
821  *f++ = (0x1F & rv) |
822  (0xE0 & (gv << 5));
823  *f++ = (0x03 & (gv >> 3)) |
824  (0x7C & (bv << 2));
825  break;
826  case V4L2_PIX_FMT_RGB565:
827  *f++ = (0x1F & rv) |
828  (0xE0 & (gv << 5));
829  *f++ = (0x07 & (gv >> 3)) |
830  (0xF8 & bv);
831  break;
832  case V4L2_PIX_FMT_RGB24:
833  *f++ = rv;
834  *f++ = gv;
835  *f++ = bv;
836  break;
837  case V4L2_PIX_FMT_RGB32:
838  *f++ = rv;
839  *f++ = gv;
840  *f++ = bv;
841  f++;
842  break;
843  }
844  }
845  clipmask_index++;
846  }
847  /* Deal with non-integer no. of bytes for YUV420P */
848  if (frame->v4l2_format.format != V4L2_PIX_FMT_YVU420)
849  *pcopylen += frame->v4l2_linesize;
850  else
851  *pcopylen += frame->curline & 0x01 ? frame->v4l2_linesize : frame->v4l2_linesize << 1;
852 
853  frame->curline += 1;
854 
855  if (frame->curline >= frame->frmheight)
856  return parse_state_next_frame;
857  return parse_state_continue;
858 
859 }
860 
861 
862 /*
863  * usbvision_parse_lines_420()
864  *
865  * Parse two lines from the scratch buffer, put
866  * decoded RGB value into the current frame buffer and add the written
867  * number of bytes (RGB) to the *pcopylen.
868  *
869  */
870 static enum parse_state usbvision_parse_lines_420(struct usb_usbvision *usbvision,
871  long *pcopylen)
872 {
873  struct usbvision_frame *frame;
874  unsigned char *f_even = NULL, *f_odd = NULL;
875  unsigned int pixel_per_line, block;
876  int pixel, block_split;
877  int y_ptr, u_ptr, v_ptr, y_odd_offset;
878  const int y_block_size = 128;
879  const int uv_block_size = 64;
880  const int sub_block_size = 32;
881  const int y_step[] = { 0, 0, 0, 2 }, y_step_size = 4;
882  const int uv_step[] = { 0, 0, 0, 4 }, uv_step_size = 4;
883  unsigned char y[2], u, v; /* YUV components */
884  int y_, u_, v_, vb, uvg, ur;
885  int r_, g_, b_; /* RGB components */
886  unsigned char g;
887  int clipmask_even_index, clipmask_odd_index, bytes_per_pixel;
888  int clipmask_add, stretch_bytes;
889 
890  frame = usbvision->cur_frame;
891  f_even = frame->data + (frame->v4l2_linesize * frame->curline);
892  f_odd = f_even + frame->v4l2_linesize * usbvision->stretch_height;
893 
894  /* Make sure there's enough data for the entire line */
895  /* In this mode usbvision transfer 3 bytes for every 2 pixels */
896  /* I need two lines to decode the color */
897  bytes_per_pixel = frame->v4l2_format.bytes_per_pixel;
898  stretch_bytes = (usbvision->stretch_width - 1) * bytes_per_pixel;
899  clipmask_even_index = frame->curline * MAX_FRAME_WIDTH;
900  clipmask_odd_index = clipmask_even_index + MAX_FRAME_WIDTH;
901  clipmask_add = usbvision->stretch_width;
902  pixel_per_line = frame->isoc_header.frame_width;
903 
904  if (scratch_len(usbvision) < (int)pixel_per_line * 3) {
905  /* printk(KERN_DEBUG "out of data, need %d\n", len); */
906  return parse_state_out;
907  }
908 
909  if ((frame->curline + 1) >= frame->frmheight)
910  return parse_state_next_frame;
911 
912  block_split = (pixel_per_line%y_block_size) ? 1 : 0; /* are some blocks splitted into different lines? */
913 
914  y_odd_offset = (pixel_per_line / y_block_size) * (y_block_size + uv_block_size)
915  + block_split * uv_block_size;
916 
917  scratch_set_extra_ptr(usbvision, &y_ptr, y_odd_offset);
918  scratch_set_extra_ptr(usbvision, &u_ptr, y_block_size);
919  scratch_set_extra_ptr(usbvision, &v_ptr, y_odd_offset
920  + (4 - block_split) * sub_block_size);
921 
922  for (block = 0; block < (pixel_per_line / sub_block_size); block++) {
923  for (pixel = 0; pixel < sub_block_size; pixel += 2) {
924  scratch_get(usbvision, &y[0], 2);
925  scratch_get_extra(usbvision, &u, &u_ptr, 1);
926  scratch_get_extra(usbvision, &v, &v_ptr, 1);
927 
928  /* I don't use the YUV_TO_RGB macro for better performance */
929  v_ = v - 128;
930  u_ = u - 128;
931  vb = 132252 * v_;
932  uvg = -53281 * u_ - 25625 * v_;
933  ur = 104595 * u_;
934 
935  if (frame->v4l2_format.format == V4L2_PIX_FMT_YUYV) {
936  *f_even++ = y[0];
937  *f_even++ = v;
938  } else {
939  y_ = 76284 * (y[0] - 16);
940 
941  b_ = (y_ + vb) >> 16;
942  g_ = (y_ + uvg) >> 16;
943  r_ = (y_ + ur) >> 16;
944 
945  switch (frame->v4l2_format.format) {
946  case V4L2_PIX_FMT_RGB565:
947  g = LIMIT_RGB(g_);
948  *f_even++ =
949  (0x1F & LIMIT_RGB(r_)) |
950  (0xE0 & (g << 5));
951  *f_even++ =
952  (0x07 & (g >> 3)) |
953  (0xF8 & LIMIT_RGB(b_));
954  break;
955  case V4L2_PIX_FMT_RGB24:
956  *f_even++ = LIMIT_RGB(r_);
957  *f_even++ = LIMIT_RGB(g_);
958  *f_even++ = LIMIT_RGB(b_);
959  break;
960  case V4L2_PIX_FMT_RGB32:
961  *f_even++ = LIMIT_RGB(r_);
962  *f_even++ = LIMIT_RGB(g_);
963  *f_even++ = LIMIT_RGB(b_);
964  f_even++;
965  break;
966  case V4L2_PIX_FMT_RGB555:
967  g = LIMIT_RGB(g_);
968  *f_even++ = (0x1F & LIMIT_RGB(r_)) |
969  (0xE0 & (g << 5));
970  *f_even++ = (0x03 & (g >> 3)) |
971  (0x7C & (LIMIT_RGB(b_) << 2));
972  break;
973  }
974  }
975  clipmask_even_index += clipmask_add;
976  f_even += stretch_bytes;
977 
978  if (frame->v4l2_format.format == V4L2_PIX_FMT_YUYV) {
979  *f_even++ = y[1];
980  *f_even++ = u;
981  } else {
982  y_ = 76284 * (y[1] - 16);
983 
984  b_ = (y_ + vb) >> 16;
985  g_ = (y_ + uvg) >> 16;
986  r_ = (y_ + ur) >> 16;
987 
988  switch (frame->v4l2_format.format) {
989  case V4L2_PIX_FMT_RGB565:
990  g = LIMIT_RGB(g_);
991  *f_even++ =
992  (0x1F & LIMIT_RGB(r_)) |
993  (0xE0 & (g << 5));
994  *f_even++ =
995  (0x07 & (g >> 3)) |
996  (0xF8 & LIMIT_RGB(b_));
997  break;
998  case V4L2_PIX_FMT_RGB24:
999  *f_even++ = LIMIT_RGB(r_);
1000  *f_even++ = LIMIT_RGB(g_);
1001  *f_even++ = LIMIT_RGB(b_);
1002  break;
1003  case V4L2_PIX_FMT_RGB32:
1004  *f_even++ = LIMIT_RGB(r_);
1005  *f_even++ = LIMIT_RGB(g_);
1006  *f_even++ = LIMIT_RGB(b_);
1007  f_even++;
1008  break;
1009  case V4L2_PIX_FMT_RGB555:
1010  g = LIMIT_RGB(g_);
1011  *f_even++ = (0x1F & LIMIT_RGB(r_)) |
1012  (0xE0 & (g << 5));
1013  *f_even++ = (0x03 & (g >> 3)) |
1014  (0x7C & (LIMIT_RGB(b_) << 2));
1015  break;
1016  }
1017  }
1018  clipmask_even_index += clipmask_add;
1019  f_even += stretch_bytes;
1020 
1021  scratch_get_extra(usbvision, &y[0], &y_ptr, 2);
1022 
1023  if (frame->v4l2_format.format == V4L2_PIX_FMT_YUYV) {
1024  *f_odd++ = y[0];
1025  *f_odd++ = v;
1026  } else {
1027  y_ = 76284 * (y[0] - 16);
1028 
1029  b_ = (y_ + vb) >> 16;
1030  g_ = (y_ + uvg) >> 16;
1031  r_ = (y_ + ur) >> 16;
1032 
1033  switch (frame->v4l2_format.format) {
1034  case V4L2_PIX_FMT_RGB565:
1035  g = LIMIT_RGB(g_);
1036  *f_odd++ =
1037  (0x1F & LIMIT_RGB(r_)) |
1038  (0xE0 & (g << 5));
1039  *f_odd++ =
1040  (0x07 & (g >> 3)) |
1041  (0xF8 & LIMIT_RGB(b_));
1042  break;
1043  case V4L2_PIX_FMT_RGB24:
1044  *f_odd++ = LIMIT_RGB(r_);
1045  *f_odd++ = LIMIT_RGB(g_);
1046  *f_odd++ = LIMIT_RGB(b_);
1047  break;
1048  case V4L2_PIX_FMT_RGB32:
1049  *f_odd++ = LIMIT_RGB(r_);
1050  *f_odd++ = LIMIT_RGB(g_);
1051  *f_odd++ = LIMIT_RGB(b_);
1052  f_odd++;
1053  break;
1054  case V4L2_PIX_FMT_RGB555:
1055  g = LIMIT_RGB(g_);
1056  *f_odd++ = (0x1F & LIMIT_RGB(r_)) |
1057  (0xE0 & (g << 5));
1058  *f_odd++ = (0x03 & (g >> 3)) |
1059  (0x7C & (LIMIT_RGB(b_) << 2));
1060  break;
1061  }
1062  }
1063  clipmask_odd_index += clipmask_add;
1064  f_odd += stretch_bytes;
1065 
1066  if (frame->v4l2_format.format == V4L2_PIX_FMT_YUYV) {
1067  *f_odd++ = y[1];
1068  *f_odd++ = u;
1069  } else {
1070  y_ = 76284 * (y[1] - 16);
1071 
1072  b_ = (y_ + vb) >> 16;
1073  g_ = (y_ + uvg) >> 16;
1074  r_ = (y_ + ur) >> 16;
1075 
1076  switch (frame->v4l2_format.format) {
1077  case V4L2_PIX_FMT_RGB565:
1078  g = LIMIT_RGB(g_);
1079  *f_odd++ =
1080  (0x1F & LIMIT_RGB(r_)) |
1081  (0xE0 & (g << 5));
1082  *f_odd++ =
1083  (0x07 & (g >> 3)) |
1084  (0xF8 & LIMIT_RGB(b_));
1085  break;
1086  case V4L2_PIX_FMT_RGB24:
1087  *f_odd++ = LIMIT_RGB(r_);
1088  *f_odd++ = LIMIT_RGB(g_);
1089  *f_odd++ = LIMIT_RGB(b_);
1090  break;
1091  case V4L2_PIX_FMT_RGB32:
1092  *f_odd++ = LIMIT_RGB(r_);
1093  *f_odd++ = LIMIT_RGB(g_);
1094  *f_odd++ = LIMIT_RGB(b_);
1095  f_odd++;
1096  break;
1097  case V4L2_PIX_FMT_RGB555:
1098  g = LIMIT_RGB(g_);
1099  *f_odd++ = (0x1F & LIMIT_RGB(r_)) |
1100  (0xE0 & (g << 5));
1101  *f_odd++ = (0x03 & (g >> 3)) |
1102  (0x7C & (LIMIT_RGB(b_) << 2));
1103  break;
1104  }
1105  }
1106  clipmask_odd_index += clipmask_add;
1107  f_odd += stretch_bytes;
1108  }
1109 
1110  scratch_rm_old(usbvision, y_step[block % y_step_size] * sub_block_size);
1111  scratch_inc_extra_ptr(&y_ptr, y_step[(block + 2 * block_split) % y_step_size]
1112  * sub_block_size);
1113  scratch_inc_extra_ptr(&u_ptr, uv_step[block % uv_step_size]
1114  * sub_block_size);
1115  scratch_inc_extra_ptr(&v_ptr, uv_step[(block + 2 * block_split) % uv_step_size]
1116  * sub_block_size);
1117  }
1118 
1119  scratch_rm_old(usbvision, pixel_per_line * 3 / 2
1120  + block_split * sub_block_size);
1121 
1122  frame->curline += 2 * usbvision->stretch_height;
1123  *pcopylen += frame->v4l2_linesize * 2 * usbvision->stretch_height;
1124 
1125  if (frame->curline >= frame->frmheight)
1126  return parse_state_next_frame;
1127  return parse_state_continue;
1128 }
1129 
1130 /*
1131  * usbvision_parse_data()
1132  *
1133  * Generic routine to parse the scratch buffer. It employs either
1134  * usbvision_find_header() or usbvision_parse_lines() to do most
1135  * of work.
1136  *
1137  */
1138 static void usbvision_parse_data(struct usb_usbvision *usbvision)
1139 {
1140  struct usbvision_frame *frame;
1141  enum parse_state newstate;
1142  long copylen = 0;
1143  unsigned long lock_flags;
1144 
1145  frame = usbvision->cur_frame;
1146 
1147  PDEBUG(DBG_PARSE, "parsing len=%d\n", scratch_len(usbvision));
1148 
1149  while (1) {
1150  newstate = parse_state_out;
1151  if (scratch_len(usbvision)) {
1152  if (frame->scanstate == scan_state_scanning) {
1153  newstate = usbvision_find_header(usbvision);
1154  } else if (frame->scanstate == scan_state_lines) {
1155  if (usbvision->isoc_mode == ISOC_MODE_YUV420)
1156  newstate = usbvision_parse_lines_420(usbvision, &copylen);
1157  else if (usbvision->isoc_mode == ISOC_MODE_YUV422)
1158  newstate = usbvision_parse_lines_422(usbvision, &copylen);
1159  else if (usbvision->isoc_mode == ISOC_MODE_COMPRESS)
1160  newstate = usbvision_parse_compress(usbvision, &copylen);
1161  }
1162  }
1163  if (newstate == parse_state_continue)
1164  continue;
1165  if ((newstate == parse_state_next_frame) || (newstate == parse_state_out))
1166  break;
1167  return; /* parse_state_end_parse */
1168  }
1169 
1170  if (newstate == parse_state_next_frame) {
1171  frame->grabstate = frame_state_done;
1172  do_gettimeofday(&(frame->timestamp));
1173  frame->sequence = usbvision->frame_num;
1174 
1175  spin_lock_irqsave(&usbvision->queue_lock, lock_flags);
1176  list_move_tail(&(frame->frame), &usbvision->outqueue);
1177  usbvision->cur_frame = NULL;
1178  spin_unlock_irqrestore(&usbvision->queue_lock, lock_flags);
1179 
1180  usbvision->frame_num++;
1181 
1182  /* This will cause the process to request another frame. */
1183  if (waitqueue_active(&usbvision->wait_frame)) {
1184  PDEBUG(DBG_PARSE, "Wake up !");
1185  wake_up_interruptible(&usbvision->wait_frame);
1186  }
1187  } else {
1188  frame->grabstate = frame_state_grabbing;
1189  }
1190 
1191  /* Update the frame's uncompressed length. */
1192  frame->scanlength += copylen;
1193 }
1194 
1195 
1196 /*
1197  * Make all of the blocks of data contiguous
1198  */
1199 static int usbvision_compress_isochronous(struct usb_usbvision *usbvision,
1200  struct urb *urb)
1201 {
1202  unsigned char *packet_data;
1203  int i, totlen = 0;
1204 
1205  for (i = 0; i < urb->number_of_packets; i++) {
1206  int packet_len = urb->iso_frame_desc[i].actual_length;
1207  int packet_stat = urb->iso_frame_desc[i].status;
1208 
1209  packet_data = urb->transfer_buffer + urb->iso_frame_desc[i].offset;
1210 
1211  /* Detect and ignore errored packets */
1212  if (packet_stat) { /* packet_stat != 0 ????????????? */
1213  PDEBUG(DBG_ISOC, "data error: [%d] len=%d, status=%X", i, packet_len, packet_stat);
1214  usbvision->isoc_err_count++;
1215  continue;
1216  }
1217 
1218  /* Detect and ignore empty packets */
1219  if (packet_len < 0) {
1220  PDEBUG(DBG_ISOC, "error packet [%d]", i);
1221  usbvision->isoc_skip_count++;
1222  continue;
1223  } else if (packet_len == 0) { /* Frame end ????? */
1224  PDEBUG(DBG_ISOC, "null packet [%d]", i);
1225  usbvision->isocstate = isoc_state_no_frame;
1226  usbvision->isoc_skip_count++;
1227  continue;
1228  } else if (packet_len > usbvision->isoc_packet_size) {
1229  PDEBUG(DBG_ISOC, "packet[%d] > isoc_packet_size", i);
1230  usbvision->isoc_skip_count++;
1231  continue;
1232  }
1233 
1234  PDEBUG(DBG_ISOC, "packet ok [%d] len=%d", i, packet_len);
1235 
1236  if (usbvision->isocstate == isoc_state_no_frame) { /* new frame begins */
1237  usbvision->isocstate = isoc_state_in_frame;
1238  scratch_mark_header(usbvision);
1239  usbvision_measure_bandwidth(usbvision);
1240  PDEBUG(DBG_ISOC, "packet with header");
1241  }
1242 
1243  /*
1244  * If usbvision continues to feed us with data but there is no
1245  * consumption (if, for example, V4L client fell asleep) we
1246  * may overflow the buffer. We have to move old data over to
1247  * free room for new data. This is bad for old data. If we
1248  * just drop new data then it's bad for new data... choose
1249  * your favorite evil here.
1250  */
1251  if (scratch_free(usbvision) < packet_len) {
1252  usbvision->scratch_ovf_count++;
1253  PDEBUG(DBG_ISOC, "scratch buf overflow! scr_len: %d, n: %d",
1254  scratch_len(usbvision), packet_len);
1255  scratch_rm_old(usbvision, packet_len - scratch_free(usbvision));
1256  }
1257 
1258  /* Now we know that there is enough room in scratch buffer */
1259  scratch_put(usbvision, packet_data, packet_len);
1260  totlen += packet_len;
1261  usbvision->isoc_data_count += packet_len;
1262  usbvision->isoc_packet_count++;
1263  }
1264 #if ENABLE_HEXDUMP
1265  if (totlen > 0) {
1266  static int foo;
1267 
1268  if (foo < 1) {
1269  printk(KERN_DEBUG "+%d.\n", usbvision->scratchlen);
1270  usbvision_hexdump(data0, (totlen > 64) ? 64 : totlen);
1271  ++foo;
1272  }
1273  }
1274 #endif
1275  return totlen;
1276 }
1277 
1278 static void usbvision_isoc_irq(struct urb *urb)
1279 {
1280  int err_code = 0;
1281  int len;
1282  struct usb_usbvision *usbvision = urb->context;
1283  int i;
1284  unsigned long start_time = jiffies;
1285  struct usbvision_frame **f;
1286 
1287  /* We don't want to do anything if we are about to be removed! */
1288  if (!USBVISION_IS_OPERATIONAL(usbvision))
1289  return;
1290 
1291  /* any urb with wrong status is ignored without acknowledgement */
1292  if (urb->status == -ENOENT)
1293  return;
1294 
1295  f = &usbvision->cur_frame;
1296 
1297  /* Manage streaming interruption */
1298  if (usbvision->streaming == stream_interrupt) {
1299  usbvision->streaming = stream_idle;
1300  if ((*f)) {
1301  (*f)->grabstate = frame_state_ready;
1302  (*f)->scanstate = scan_state_scanning;
1303  }
1304  PDEBUG(DBG_IRQ, "stream interrupted");
1305  wake_up_interruptible(&usbvision->wait_stream);
1306  }
1307 
1308  /* Copy the data received into our scratch buffer */
1309  len = usbvision_compress_isochronous(usbvision, urb);
1310 
1311  usbvision->isoc_urb_count++;
1312  usbvision->urb_length = len;
1313 
1314  if (usbvision->streaming == stream_on) {
1315  /* If we collected enough data let's parse! */
1316  if (scratch_len(usbvision) > USBVISION_HEADER_LENGTH &&
1317  !list_empty(&(usbvision->inqueue))) {
1318  if (!(*f)) {
1319  (*f) = list_entry(usbvision->inqueue.next,
1320  struct usbvision_frame,
1321  frame);
1322  }
1323  usbvision_parse_data(usbvision);
1324  } else {
1325  /* If we don't have a frame
1326  we're current working on, complain */
1327  PDEBUG(DBG_IRQ,
1328  "received data, but no one needs it");
1329  scratch_reset(usbvision);
1330  }
1331  } else {
1332  PDEBUG(DBG_IRQ, "received data, but no one needs it");
1333  scratch_reset(usbvision);
1334  }
1335 
1336  usbvision->time_in_irq += jiffies - start_time;
1337 
1338  for (i = 0; i < USBVISION_URB_FRAMES; i++) {
1339  urb->iso_frame_desc[i].status = 0;
1340  urb->iso_frame_desc[i].actual_length = 0;
1341  }
1342 
1343  urb->status = 0;
1344  urb->dev = usbvision->dev;
1345  err_code = usb_submit_urb(urb, GFP_ATOMIC);
1346 
1347  if (err_code) {
1348  dev_err(&usbvision->dev->dev,
1349  "%s: usb_submit_urb failed: error %d\n",
1350  __func__, err_code);
1351  }
1352 
1353  return;
1354 }
1355 
1356 /*************************************/
1357 /* Low level usbvision access functions */
1358 /*************************************/
1359 
1360 /*
1361  * usbvision_read_reg()
1362  *
1363  * return < 0 -> Error
1364  * >= 0 -> Data
1365  */
1366 
1367 int usbvision_read_reg(struct usb_usbvision *usbvision, unsigned char reg)
1368 {
1369  int err_code = 0;
1370  unsigned char buffer[1];
1371 
1372  if (!USBVISION_IS_OPERATIONAL(usbvision))
1373  return -1;
1374 
1375  err_code = usb_control_msg(usbvision->dev, usb_rcvctrlpipe(usbvision->dev, 1),
1376  USBVISION_OP_CODE,
1377  USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_ENDPOINT,
1378  0, (__u16) reg, buffer, 1, HZ);
1379 
1380  if (err_code < 0) {
1381  dev_err(&usbvision->dev->dev,
1382  "%s: failed: error %d\n", __func__, err_code);
1383  return err_code;
1384  }
1385  return buffer[0];
1386 }
1387 
1388 /*
1389  * usbvision_write_reg()
1390  *
1391  * return 1 -> Reg written
1392  * 0 -> usbvision is not yet ready
1393  * -1 -> Something went wrong
1394  */
1395 
1396 int usbvision_write_reg(struct usb_usbvision *usbvision, unsigned char reg,
1397  unsigned char value)
1398 {
1399  int err_code = 0;
1400 
1401  if (!USBVISION_IS_OPERATIONAL(usbvision))
1402  return 0;
1403 
1404  err_code = usb_control_msg(usbvision->dev, usb_sndctrlpipe(usbvision->dev, 1),
1405  USBVISION_OP_CODE,
1406  USB_DIR_OUT | USB_TYPE_VENDOR |
1407  USB_RECIP_ENDPOINT, 0, (__u16) reg, &value, 1, HZ);
1408 
1409  if (err_code < 0) {
1410  dev_err(&usbvision->dev->dev,
1411  "%s: failed: error %d\n", __func__, err_code);
1412  }
1413  return err_code;
1414 }
1415 
1416 
1417 static void usbvision_ctrl_urb_complete(struct urb *urb)
1418 {
1419  struct usb_usbvision *usbvision = (struct usb_usbvision *)urb->context;
1420 
1421  PDEBUG(DBG_IRQ, "");
1422  usbvision->ctrl_urb_busy = 0;
1423  if (waitqueue_active(&usbvision->ctrl_urb_wq))
1424  wake_up_interruptible(&usbvision->ctrl_urb_wq);
1425 }
1426 
1427 
1428 static int usbvision_write_reg_irq(struct usb_usbvision *usbvision, int address,
1429  unsigned char *data, int len)
1430 {
1431  int err_code = 0;
1432 
1433  PDEBUG(DBG_IRQ, "");
1434  if (len > 8)
1435  return -EFAULT;
1436  if (usbvision->ctrl_urb_busy)
1437  return -EBUSY;
1438  usbvision->ctrl_urb_busy = 1;
1439 
1440  usbvision->ctrl_urb_setup.bRequestType = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_ENDPOINT;
1441  usbvision->ctrl_urb_setup.bRequest = USBVISION_OP_CODE;
1442  usbvision->ctrl_urb_setup.wValue = 0;
1443  usbvision->ctrl_urb_setup.wIndex = cpu_to_le16(address);
1444  usbvision->ctrl_urb_setup.wLength = cpu_to_le16(len);
1445  usb_fill_control_urb(usbvision->ctrl_urb, usbvision->dev,
1446  usb_sndctrlpipe(usbvision->dev, 1),
1447  (unsigned char *)&usbvision->ctrl_urb_setup,
1448  (void *)usbvision->ctrl_urb_buffer, len,
1449  usbvision_ctrl_urb_complete,
1450  (void *)usbvision);
1451 
1452  memcpy(usbvision->ctrl_urb_buffer, data, len);
1453 
1454  err_code = usb_submit_urb(usbvision->ctrl_urb, GFP_ATOMIC);
1455  if (err_code < 0) {
1456  /* error in usb_submit_urb() */
1457  usbvision->ctrl_urb_busy = 0;
1458  }
1459  PDEBUG(DBG_IRQ, "submit %d byte: error %d", len, err_code);
1460  return err_code;
1461 }
1462 
1463 
1464 static int usbvision_init_compression(struct usb_usbvision *usbvision)
1465 {
1466  int err_code = 0;
1467 
1468  usbvision->last_isoc_frame_num = -1;
1469  usbvision->isoc_data_count = 0;
1470  usbvision->isoc_packet_count = 0;
1471  usbvision->isoc_skip_count = 0;
1472  usbvision->compr_level = 50;
1473  usbvision->last_compr_level = -1;
1474  usbvision->isoc_urb_count = 0;
1475  usbvision->request_intra = 1;
1476  usbvision->isoc_measure_bandwidth_count = 0;
1477 
1478  return err_code;
1479 }
1480 
1481 /* this function measures the used bandwidth since last call
1482  * return: 0 : no error
1483  * sets used_bandwidth to 1-100 : 1-100% of full bandwidth resp. to isoc_packet_size
1484  */
1485 static int usbvision_measure_bandwidth(struct usb_usbvision *usbvision)
1486 {
1487  int err_code = 0;
1488 
1489  if (usbvision->isoc_measure_bandwidth_count < 2) { /* this gives an average bandwidth of 3 frames */
1490  usbvision->isoc_measure_bandwidth_count++;
1491  return err_code;
1492  }
1493  if ((usbvision->isoc_packet_size > 0) && (usbvision->isoc_packet_count > 0)) {
1494  usbvision->used_bandwidth = usbvision->isoc_data_count /
1495  (usbvision->isoc_packet_count + usbvision->isoc_skip_count) *
1496  100 / usbvision->isoc_packet_size;
1497  }
1498  usbvision->isoc_measure_bandwidth_count = 0;
1499  usbvision->isoc_data_count = 0;
1500  usbvision->isoc_packet_count = 0;
1501  usbvision->isoc_skip_count = 0;
1502  return err_code;
1503 }
1504 
1505 static int usbvision_adjust_compression(struct usb_usbvision *usbvision)
1506 {
1507  int err_code = 0;
1508  unsigned char buffer[6];
1509 
1510  PDEBUG(DBG_IRQ, "");
1511  if ((adjust_compression) && (usbvision->used_bandwidth > 0)) {
1512  usbvision->compr_level += (usbvision->used_bandwidth - 90) / 2;
1513  RESTRICT_TO_RANGE(usbvision->compr_level, 0, 100);
1514  if (usbvision->compr_level != usbvision->last_compr_level) {
1515  int distortion;
1516 
1517  if (usbvision->bridge_type == BRIDGE_NT1004 || usbvision->bridge_type == BRIDGE_NT1005) {
1518  buffer[0] = (unsigned char)(4 + 16 * usbvision->compr_level / 100); /* PCM Threshold 1 */
1519  buffer[1] = (unsigned char)(4 + 8 * usbvision->compr_level / 100); /* PCM Threshold 2 */
1520  distortion = 7 + 248 * usbvision->compr_level / 100;
1521  buffer[2] = (unsigned char)(distortion & 0xFF); /* Average distortion Threshold (inter) */
1522  buffer[3] = (unsigned char)(distortion & 0xFF); /* Average distortion Threshold (intra) */
1523  distortion = 1 + 42 * usbvision->compr_level / 100;
1524  buffer[4] = (unsigned char)(distortion & 0xFF); /* Maximum distortion Threshold (inter) */
1525  buffer[5] = (unsigned char)(distortion & 0xFF); /* Maximum distortion Threshold (intra) */
1526  } else { /* BRIDGE_NT1003 */
1527  buffer[0] = (unsigned char)(4 + 16 * usbvision->compr_level / 100); /* PCM threshold 1 */
1528  buffer[1] = (unsigned char)(4 + 8 * usbvision->compr_level / 100); /* PCM threshold 2 */
1529  distortion = 2 + 253 * usbvision->compr_level / 100;
1530  buffer[2] = (unsigned char)(distortion & 0xFF); /* distortion threshold bit0-7 */
1531  buffer[3] = 0; /* (unsigned char)((distortion >> 8) & 0x0F); distortion threshold bit 8-11 */
1532  distortion = 0 + 43 * usbvision->compr_level / 100;
1533  buffer[4] = (unsigned char)(distortion & 0xFF); /* maximum distortion bit0-7 */
1534  buffer[5] = 0; /* (unsigned char)((distortion >> 8) & 0x01); maximum distortion bit 8 */
1535  }
1536  err_code = usbvision_write_reg_irq(usbvision, USBVISION_PCM_THR1, buffer, 6);
1537  if (err_code == 0) {
1538  PDEBUG(DBG_IRQ, "new compr params %#02x %#02x %#02x %#02x %#02x %#02x", buffer[0],
1539  buffer[1], buffer[2], buffer[3], buffer[4], buffer[5]);
1540  usbvision->last_compr_level = usbvision->compr_level;
1541  }
1542  }
1543  }
1544  return err_code;
1545 }
1546 
1547 static int usbvision_request_intra(struct usb_usbvision *usbvision)
1548 {
1549  int err_code = 0;
1550  unsigned char buffer[1];
1551 
1552  PDEBUG(DBG_IRQ, "");
1553  usbvision->request_intra = 1;
1554  buffer[0] = 1;
1555  usbvision_write_reg_irq(usbvision, USBVISION_FORCE_INTRA, buffer, 1);
1556  return err_code;
1557 }
1558 
1559 static int usbvision_unrequest_intra(struct usb_usbvision *usbvision)
1560 {
1561  int err_code = 0;
1562  unsigned char buffer[1];
1563 
1564  PDEBUG(DBG_IRQ, "");
1565  usbvision->request_intra = 0;
1566  buffer[0] = 0;
1567  usbvision_write_reg_irq(usbvision, USBVISION_FORCE_INTRA, buffer, 1);
1568  return err_code;
1569 }
1570 
1571 /*******************************
1572  * usbvision utility functions
1573  *******************************/
1574 
1575 int usbvision_power_off(struct usb_usbvision *usbvision)
1576 {
1577  int err_code = 0;
1578 
1579  PDEBUG(DBG_FUNC, "");
1580 
1581  err_code = usbvision_write_reg(usbvision, USBVISION_PWR_REG, USBVISION_SSPND_EN);
1582  if (err_code == 1)
1583  usbvision->power = 0;
1584  PDEBUG(DBG_FUNC, "%s: err_code %d", (err_code != 1) ? "ERROR" : "power is off", err_code);
1585  return err_code;
1586 }
1587 
1588 /* configure webcam image sensor using the serial port */
1589 static int usbvision_init_webcam(struct usb_usbvision *usbvision)
1590 {
1591  int rc;
1592  int i;
1593  static char init_values[38][3] = {
1594  { 0x04, 0x12, 0x08 }, { 0x05, 0xff, 0xc8 }, { 0x06, 0x18, 0x07 }, { 0x07, 0x90, 0x00 },
1595  { 0x09, 0x00, 0x00 }, { 0x0a, 0x00, 0x00 }, { 0x0b, 0x08, 0x00 }, { 0x0d, 0xcc, 0xcc },
1596  { 0x0e, 0x13, 0x14 }, { 0x10, 0x9b, 0x83 }, { 0x11, 0x5a, 0x3f }, { 0x12, 0xe4, 0x73 },
1597  { 0x13, 0x88, 0x84 }, { 0x14, 0x89, 0x80 }, { 0x15, 0x00, 0x20 }, { 0x16, 0x00, 0x00 },
1598  { 0x17, 0xff, 0xa0 }, { 0x18, 0x6b, 0x20 }, { 0x19, 0x22, 0x40 }, { 0x1a, 0x10, 0x07 },
1599  { 0x1b, 0x00, 0x47 }, { 0x1c, 0x03, 0xe0 }, { 0x1d, 0x00, 0x00 }, { 0x1e, 0x00, 0x00 },
1600  { 0x1f, 0x00, 0x00 }, { 0x20, 0x00, 0x00 }, { 0x21, 0x00, 0x00 }, { 0x22, 0x00, 0x00 },
1601  { 0x23, 0x00, 0x00 }, { 0x24, 0x00, 0x00 }, { 0x25, 0x00, 0x00 }, { 0x26, 0x00, 0x00 },
1602  { 0x27, 0x00, 0x00 }, { 0x28, 0x00, 0x00 }, { 0x29, 0x00, 0x00 }, { 0x08, 0x80, 0x60 },
1603  { 0x0f, 0x2d, 0x24 }, { 0x0c, 0x80, 0x80 }
1604  };
1605  char value[3];
1606 
1607  /* the only difference between PAL and NTSC init_values */
1608  if (usbvision_device_data[usbvision->dev_model].video_norm == V4L2_STD_NTSC)
1609  init_values[4][1] = 0x34;
1610 
1611  for (i = 0; i < sizeof(init_values) / 3; i++) {
1612  usbvision_write_reg(usbvision, USBVISION_SER_MODE, USBVISION_SER_MODE_SOFT);
1613  memcpy(value, init_values[i], 3);
1614  rc = usb_control_msg(usbvision->dev,
1615  usb_sndctrlpipe(usbvision->dev, 1),
1616  USBVISION_OP_CODE,
1617  USB_DIR_OUT | USB_TYPE_VENDOR |
1618  USB_RECIP_ENDPOINT, 0,
1619  (__u16) USBVISION_SER_DAT1, value,
1620  3, HZ);
1621  if (rc < 0)
1622  return rc;
1623  usbvision_write_reg(usbvision, USBVISION_SER_MODE, USBVISION_SER_MODE_SIO);
1624  /* write 3 bytes to the serial port using SIO mode */
1625  usbvision_write_reg(usbvision, USBVISION_SER_CONT, 3 | 0x10);
1626  usbvision_write_reg(usbvision, USBVISION_IOPIN_REG, 0);
1627  usbvision_write_reg(usbvision, USBVISION_SER_MODE, USBVISION_SER_MODE_SOFT);
1628  usbvision_write_reg(usbvision, USBVISION_IOPIN_REG, USBVISION_IO_2);
1629  usbvision_write_reg(usbvision, USBVISION_SER_MODE, USBVISION_SER_MODE_SOFT | USBVISION_CLK_OUT);
1630  usbvision_write_reg(usbvision, USBVISION_SER_MODE, USBVISION_SER_MODE_SOFT | USBVISION_DAT_IO);
1631  usbvision_write_reg(usbvision, USBVISION_SER_MODE, USBVISION_SER_MODE_SOFT | USBVISION_CLK_OUT | USBVISION_DAT_IO);
1632  }
1633 
1634  return 0;
1635 }
1636 
1637 /*
1638  * usbvision_set_video_format()
1639  *
1640  */
1641 static int usbvision_set_video_format(struct usb_usbvision *usbvision, int format)
1642 {
1643  static const char proc[] = "usbvision_set_video_format";
1644  int rc;
1645  unsigned char value[2];
1646 
1647  if (!USBVISION_IS_OPERATIONAL(usbvision))
1648  return 0;
1649 
1650  PDEBUG(DBG_FUNC, "isoc_mode %#02x", format);
1651 
1652  if ((format != ISOC_MODE_YUV422)
1653  && (format != ISOC_MODE_YUV420)
1654  && (format != ISOC_MODE_COMPRESS)) {
1655  printk(KERN_ERR "usbvision: unknown video format %02x, using default YUV420",
1656  format);
1657  format = ISOC_MODE_YUV420;
1658  }
1659  value[0] = 0x0A; /* TODO: See the effect of the filter */
1660  value[1] = format; /* Sets the VO_MODE register which follows FILT_CONT */
1661  rc = usb_control_msg(usbvision->dev, usb_sndctrlpipe(usbvision->dev, 1),
1662  USBVISION_OP_CODE,
1663  USB_DIR_OUT | USB_TYPE_VENDOR |
1664  USB_RECIP_ENDPOINT, 0,
1665  (__u16) USBVISION_FILT_CONT, value, 2, HZ);
1666 
1667  if (rc < 0) {
1668  printk(KERN_ERR "%s: ERROR=%d. USBVISION stopped - "
1669  "reconnect or reload driver.\n", proc, rc);
1670  }
1671  usbvision->isoc_mode = format;
1672  return rc;
1673 }
1674 
1675 /*
1676  * usbvision_set_output()
1677  *
1678  */
1679 
1680 int usbvision_set_output(struct usb_usbvision *usbvision, int width,
1681  int height)
1682 {
1683  int err_code = 0;
1684  int usb_width, usb_height;
1685  unsigned int frame_rate = 0, frame_drop = 0;
1686  unsigned char value[4];
1687 
1688  if (!USBVISION_IS_OPERATIONAL(usbvision))
1689  return 0;
1690 
1691  if (width > MAX_USB_WIDTH) {
1692  usb_width = width / 2;
1693  usbvision->stretch_width = 2;
1694  } else {
1695  usb_width = width;
1696  usbvision->stretch_width = 1;
1697  }
1698 
1699  if (height > MAX_USB_HEIGHT) {
1700  usb_height = height / 2;
1701  usbvision->stretch_height = 2;
1702  } else {
1703  usb_height = height;
1704  usbvision->stretch_height = 1;
1705  }
1706 
1707  RESTRICT_TO_RANGE(usb_width, MIN_FRAME_WIDTH, MAX_USB_WIDTH);
1708  usb_width &= ~(MIN_FRAME_WIDTH-1);
1709  RESTRICT_TO_RANGE(usb_height, MIN_FRAME_HEIGHT, MAX_USB_HEIGHT);
1710  usb_height &= ~(1);
1711 
1712  PDEBUG(DBG_FUNC, "usb %dx%d; screen %dx%d; stretch %dx%d",
1713  usb_width, usb_height, width, height,
1714  usbvision->stretch_width, usbvision->stretch_height);
1715 
1716  /* I'll not rewrite the same values */
1717  if ((usb_width != usbvision->curwidth) || (usb_height != usbvision->curheight)) {
1718  value[0] = usb_width & 0xff; /* LSB */
1719  value[1] = (usb_width >> 8) & 0x03; /* MSB */
1720  value[2] = usb_height & 0xff; /* LSB */
1721  value[3] = (usb_height >> 8) & 0x03; /* MSB */
1722 
1723  err_code = usb_control_msg(usbvision->dev, usb_sndctrlpipe(usbvision->dev, 1),
1724  USBVISION_OP_CODE,
1725  USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_ENDPOINT,
1726  0, (__u16) USBVISION_LXSIZE_O, value, 4, HZ);
1727 
1728  if (err_code < 0) {
1729  dev_err(&usbvision->dev->dev,
1730  "%s failed: error %d\n", __func__, err_code);
1731  return err_code;
1732  }
1733  usbvision->curwidth = usbvision->stretch_width * usb_width;
1734  usbvision->curheight = usbvision->stretch_height * usb_height;
1735  }
1736 
1737  if (usbvision->isoc_mode == ISOC_MODE_YUV422)
1738  frame_rate = (usbvision->isoc_packet_size * 1000) / (usb_width * usb_height * 2);
1739  else if (usbvision->isoc_mode == ISOC_MODE_YUV420)
1740  frame_rate = (usbvision->isoc_packet_size * 1000) / ((usb_width * usb_height * 12) / 8);
1741  else
1742  frame_rate = FRAMERATE_MAX;
1743 
1744  if (usbvision->tvnorm_id & V4L2_STD_625_50)
1745  frame_drop = frame_rate * 32 / 25 - 1;
1746  else if (usbvision->tvnorm_id & V4L2_STD_525_60)
1747  frame_drop = frame_rate * 32 / 30 - 1;
1748 
1749  RESTRICT_TO_RANGE(frame_drop, FRAMERATE_MIN, FRAMERATE_MAX);
1750 
1751  PDEBUG(DBG_FUNC, "frame_rate %d fps, frame_drop %d", frame_rate, frame_drop);
1752 
1753  frame_drop = FRAMERATE_MAX; /* We can allow the maximum here, because dropping is controlled */
1754 
1755  if (usbvision_device_data[usbvision->dev_model].codec == CODEC_WEBCAM) {
1756  if (usbvision_device_data[usbvision->dev_model].video_norm == V4L2_STD_PAL)
1757  frame_drop = 25;
1758  else
1759  frame_drop = 30;
1760  }
1761 
1762  /* frame_drop = 7; => frame_phase = 1, 5, 9, 13, 17, 21, 25, 0, 4, 8, ...
1763  => frame_skip = 4;
1764  => frame_rate = (7 + 1) * 25 / 32 = 200 / 32 = 6.25;
1765 
1766  frame_drop = 9; => frame_phase = 1, 5, 8, 11, 14, 17, 21, 24, 27, 1, 4, 8, ...
1767  => frame_skip = 4, 3, 3, 3, 3, 4, 3, 3, 3, 3, 4, ...
1768  => frame_rate = (9 + 1) * 25 / 32 = 250 / 32 = 7.8125;
1769  */
1770  err_code = usbvision_write_reg(usbvision, USBVISION_FRM_RATE, frame_drop);
1771  return err_code;
1772 }
1773 
1774 
1775 /*
1776  * usbvision_frames_alloc
1777  * allocate the required frames
1778  */
1779 int usbvision_frames_alloc(struct usb_usbvision *usbvision, int number_of_frames)
1780 {
1781  int i;
1782 
1783  /* needs to be page aligned cause the buffers can be mapped individually! */
1784  usbvision->max_frame_size = PAGE_ALIGN(usbvision->curwidth *
1785  usbvision->curheight *
1786  usbvision->palette.bytes_per_pixel);
1787 
1788  /* Try to do my best to allocate the frames the user want in the remaining memory */
1789  usbvision->num_frames = number_of_frames;
1790  while (usbvision->num_frames > 0) {
1791  usbvision->fbuf_size = usbvision->num_frames * usbvision->max_frame_size;
1792  usbvision->fbuf = usbvision_rvmalloc(usbvision->fbuf_size);
1793  if (usbvision->fbuf)
1794  break;
1795  usbvision->num_frames--;
1796  }
1797 
1798  spin_lock_init(&usbvision->queue_lock);
1799  init_waitqueue_head(&usbvision->wait_frame);
1800  init_waitqueue_head(&usbvision->wait_stream);
1801 
1802  /* Allocate all buffers */
1803  for (i = 0; i < usbvision->num_frames; i++) {
1804  usbvision->frame[i].index = i;
1805  usbvision->frame[i].grabstate = frame_state_unused;
1806  usbvision->frame[i].data = usbvision->fbuf +
1807  i * usbvision->max_frame_size;
1808  /*
1809  * Set default sizes for read operation.
1810  */
1811  usbvision->stretch_width = 1;
1812  usbvision->stretch_height = 1;
1813  usbvision->frame[i].width = usbvision->curwidth;
1814  usbvision->frame[i].height = usbvision->curheight;
1815  usbvision->frame[i].bytes_read = 0;
1816  }
1817  PDEBUG(DBG_FUNC, "allocated %d frames (%d bytes per frame)",
1818  usbvision->num_frames, usbvision->max_frame_size);
1819  return usbvision->num_frames;
1820 }
1821 
1822 /*
1823  * usbvision_frames_free
1824  * frees memory allocated for the frames
1825  */
1826 void usbvision_frames_free(struct usb_usbvision *usbvision)
1827 {
1828  /* Have to free all that memory */
1829  PDEBUG(DBG_FUNC, "free %d frames", usbvision->num_frames);
1830 
1831  if (usbvision->fbuf != NULL) {
1832  usbvision_rvfree(usbvision->fbuf, usbvision->fbuf_size);
1833  usbvision->fbuf = NULL;
1834 
1835  usbvision->num_frames = 0;
1836  }
1837 }
1838 /*
1839  * usbvision_empty_framequeues()
1840  * prepare queues for incoming and outgoing frames
1841  */
1842 void usbvision_empty_framequeues(struct usb_usbvision *usbvision)
1843 {
1844  u32 i;
1845 
1846  INIT_LIST_HEAD(&(usbvision->inqueue));
1847  INIT_LIST_HEAD(&(usbvision->outqueue));
1848 
1849  for (i = 0; i < USBVISION_NUMFRAMES; i++) {
1850  usbvision->frame[i].grabstate = frame_state_unused;
1851  usbvision->frame[i].bytes_read = 0;
1852  }
1853 }
1854 
1855 /*
1856  * usbvision_stream_interrupt()
1857  * stops streaming
1858  */
1859 int usbvision_stream_interrupt(struct usb_usbvision *usbvision)
1860 {
1861  int ret = 0;
1862 
1863  /* stop reading from the device */
1864 
1865  usbvision->streaming = stream_interrupt;
1866  ret = wait_event_timeout(usbvision->wait_stream,
1867  (usbvision->streaming == stream_idle),
1868  msecs_to_jiffies(USBVISION_NUMSBUF*USBVISION_URB_FRAMES));
1869  return ret;
1870 }
1871 
1872 /*
1873  * usbvision_set_compress_params()
1874  *
1875  */
1876 
1877 static int usbvision_set_compress_params(struct usb_usbvision *usbvision)
1878 {
1879  static const char proc[] = "usbvision_set_compresion_params: ";
1880  int rc;
1881  unsigned char value[6];
1882 
1883  value[0] = 0x0F; /* Intra-Compression cycle */
1884  value[1] = 0x01; /* Reg.45 one line per strip */
1885  value[2] = 0x00; /* Reg.46 Force intra mode on all new frames */
1886  value[3] = 0x00; /* Reg.47 FORCE_UP <- 0 normal operation (not force) */
1887  value[4] = 0xA2; /* Reg.48 BUF_THR I'm not sure if this does something in not compressed mode. */
1888  value[5] = 0x00; /* Reg.49 DVI_YUV This has nothing to do with compression */
1889 
1890  /* catched values for NT1004 */
1891  /* value[0] = 0xFF; Never apply intra mode automatically */
1892  /* value[1] = 0xF1; Use full frame height for virtual strip width; One line per strip */
1893  /* value[2] = 0x01; Force intra mode on all new frames */
1894  /* value[3] = 0x00; Strip size 400 Bytes; do not force up */
1895  /* value[4] = 0xA2; */
1896  if (!USBVISION_IS_OPERATIONAL(usbvision))
1897  return 0;
1898 
1899  rc = usb_control_msg(usbvision->dev, usb_sndctrlpipe(usbvision->dev, 1),
1900  USBVISION_OP_CODE,
1901  USB_DIR_OUT | USB_TYPE_VENDOR |
1902  USB_RECIP_ENDPOINT, 0,
1903  (__u16) USBVISION_INTRA_CYC, value, 5, HZ);
1904 
1905  if (rc < 0) {
1906  printk(KERN_ERR "%sERROR=%d. USBVISION stopped - "
1907  "reconnect or reload driver.\n", proc, rc);
1908  return rc;
1909  }
1910 
1911  if (usbvision->bridge_type == BRIDGE_NT1004) {
1912  value[0] = 20; /* PCM Threshold 1 */
1913  value[1] = 12; /* PCM Threshold 2 */
1914  value[2] = 255; /* Distortion Threshold inter */
1915  value[3] = 255; /* Distortion Threshold intra */
1916  value[4] = 43; /* Max Distortion inter */
1917  value[5] = 43; /* Max Distortion intra */
1918  } else {
1919  value[0] = 20; /* PCM Threshold 1 */
1920  value[1] = 12; /* PCM Threshold 2 */
1921  value[2] = 255; /* Distortion Threshold d7-d0 */
1922  value[3] = 0; /* Distortion Threshold d11-d8 */
1923  value[4] = 43; /* Max Distortion d7-d0 */
1924  value[5] = 0; /* Max Distortion d8 */
1925  }
1926 
1927  if (!USBVISION_IS_OPERATIONAL(usbvision))
1928  return 0;
1929 
1930  rc = usb_control_msg(usbvision->dev, usb_sndctrlpipe(usbvision->dev, 1),
1931  USBVISION_OP_CODE,
1932  USB_DIR_OUT | USB_TYPE_VENDOR |
1933  USB_RECIP_ENDPOINT, 0,
1934  (__u16) USBVISION_PCM_THR1, value, 6, HZ);
1935 
1936  if (rc < 0) {
1937  printk(KERN_ERR "%sERROR=%d. USBVISION stopped - "
1938  "reconnect or reload driver.\n", proc, rc);
1939  }
1940  return rc;
1941 }
1942 
1943 
1944 /*
1945  * usbvision_set_input()
1946  *
1947  * Set the input (saa711x, ...) size x y and other misc input params
1948  * I've no idea if this parameters are right
1949  *
1950  */
1951 int usbvision_set_input(struct usb_usbvision *usbvision)
1952 {
1953  static const char proc[] = "usbvision_set_input: ";
1954  int rc;
1955  unsigned char value[8];
1956  unsigned char dvi_yuv_value;
1957 
1958  if (!USBVISION_IS_OPERATIONAL(usbvision))
1959  return 0;
1960 
1961  /* Set input format expected from decoder*/
1962  if (usbvision_device_data[usbvision->dev_model].vin_reg1_override) {
1963  value[0] = usbvision_device_data[usbvision->dev_model].vin_reg1;
1964  } else if (usbvision_device_data[usbvision->dev_model].codec == CODEC_SAA7113) {
1965  /* SAA7113 uses 8 bit output */
1966  value[0] = USBVISION_8_422_SYNC;
1967  } else {
1968  /* I'm sure only about d2-d0 [010] 16 bit 4:2:2 usin sync pulses
1969  * as that is how saa7111 is configured */
1970  value[0] = USBVISION_16_422_SYNC;
1971  /* | USBVISION_VSNC_POL | USBVISION_VCLK_POL);*/
1972  }
1973 
1974  rc = usbvision_write_reg(usbvision, USBVISION_VIN_REG1, value[0]);
1975  if (rc < 0) {
1976  printk(KERN_ERR "%sERROR=%d. USBVISION stopped - "
1977  "reconnect or reload driver.\n", proc, rc);
1978  return rc;
1979  }
1980 
1981 
1982  if (usbvision->tvnorm_id & V4L2_STD_PAL) {
1983  value[0] = 0xC0;
1984  value[1] = 0x02; /* 0x02C0 -> 704 Input video line length */
1985  value[2] = 0x20;
1986  value[3] = 0x01; /* 0x0120 -> 288 Input video n. of lines */
1987  value[4] = 0x60;
1988  value[5] = 0x00; /* 0x0060 -> 96 Input video h offset */
1989  value[6] = 0x16;
1990  value[7] = 0x00; /* 0x0016 -> 22 Input video v offset */
1991  } else if (usbvision->tvnorm_id & V4L2_STD_SECAM) {
1992  value[0] = 0xC0;
1993  value[1] = 0x02; /* 0x02C0 -> 704 Input video line length */
1994  value[2] = 0x20;
1995  value[3] = 0x01; /* 0x0120 -> 288 Input video n. of lines */
1996  value[4] = 0x01;
1997  value[5] = 0x00; /* 0x0001 -> 01 Input video h offset */
1998  value[6] = 0x01;
1999  value[7] = 0x00; /* 0x0001 -> 01 Input video v offset */
2000  } else { /* V4L2_STD_NTSC */
2001  value[0] = 0xD0;
2002  value[1] = 0x02; /* 0x02D0 -> 720 Input video line length */
2003  value[2] = 0xF0;
2004  value[3] = 0x00; /* 0x00F0 -> 240 Input video number of lines */
2005  value[4] = 0x50;
2006  value[5] = 0x00; /* 0x0050 -> 80 Input video h offset */
2007  value[6] = 0x10;
2008  value[7] = 0x00; /* 0x0010 -> 16 Input video v offset */
2009  }
2010 
2011  /* webcam is only 480 pixels wide, both PAL and NTSC version */
2012  if (usbvision_device_data[usbvision->dev_model].codec == CODEC_WEBCAM) {
2013  value[0] = 0xe0;
2014  value[1] = 0x01; /* 0x01E0 -> 480 Input video line length */
2015  }
2016 
2017  if (usbvision_device_data[usbvision->dev_model].x_offset >= 0) {
2018  value[4] = usbvision_device_data[usbvision->dev_model].x_offset & 0xff;
2019  value[5] = (usbvision_device_data[usbvision->dev_model].x_offset & 0x0300) >> 8;
2020  }
2021 
2022  if (adjust_x_offset != -1) {
2023  value[4] = adjust_x_offset & 0xff;
2024  value[5] = (adjust_x_offset & 0x0300) >> 8;
2025  }
2026 
2027  if (usbvision_device_data[usbvision->dev_model].y_offset >= 0) {
2028  value[6] = usbvision_device_data[usbvision->dev_model].y_offset & 0xff;
2029  value[7] = (usbvision_device_data[usbvision->dev_model].y_offset & 0x0300) >> 8;
2030  }
2031 
2032  if (adjust_y_offset != -1) {
2033  value[6] = adjust_y_offset & 0xff;
2034  value[7] = (adjust_y_offset & 0x0300) >> 8;
2035  }
2036 
2037  rc = usb_control_msg(usbvision->dev, usb_sndctrlpipe(usbvision->dev, 1),
2038  USBVISION_OP_CODE, /* USBVISION specific code */
2039  USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_ENDPOINT, 0,
2040  (__u16) USBVISION_LXSIZE_I, value, 8, HZ);
2041  if (rc < 0) {
2042  printk(KERN_ERR "%sERROR=%d. USBVISION stopped - "
2043  "reconnect or reload driver.\n", proc, rc);
2044  return rc;
2045  }
2046 
2047 
2048  dvi_yuv_value = 0x00; /* U comes after V, Ya comes after U/V, Yb comes after Yb */
2049 
2050  if (usbvision_device_data[usbvision->dev_model].dvi_yuv_override) {
2051  dvi_yuv_value = usbvision_device_data[usbvision->dev_model].dvi_yuv;
2052  } else if (usbvision_device_data[usbvision->dev_model].codec == CODEC_SAA7113) {
2053  /* This changes as the fine sync control changes. Further investigation necessary */
2054  dvi_yuv_value = 0x06;
2055  }
2056 
2057  return usbvision_write_reg(usbvision, USBVISION_DVI_YUV, dvi_yuv_value);
2058 }
2059 
2060 
2061 /*
2062  * usbvision_set_dram_settings()
2063  *
2064  * Set the buffer address needed by the usbvision dram to operate
2065  * This values has been taken with usbsnoop.
2066  *
2067  */
2068 
2069 static int usbvision_set_dram_settings(struct usb_usbvision *usbvision)
2070 {
2071  int rc;
2072  unsigned char value[8];
2073 
2074  if (usbvision->isoc_mode == ISOC_MODE_COMPRESS) {
2075  value[0] = 0x42;
2076  value[1] = 0x71;
2077  value[2] = 0xff;
2078  value[3] = 0x00;
2079  value[4] = 0x98;
2080  value[5] = 0xe0;
2081  value[6] = 0x71;
2082  value[7] = 0xff;
2083  /* UR: 0x0E200-0x3FFFF = 204288 Words (1 Word = 2 Byte) */
2084  /* FDL: 0x00000-0x0E099 = 57498 Words */
2085  /* VDW: 0x0E3FF-0x3FFFF */
2086  } else {
2087  value[0] = 0x42;
2088  value[1] = 0x00;
2089  value[2] = 0xff;
2090  value[3] = 0x00;
2091  value[4] = 0x00;
2092  value[5] = 0x00;
2093  value[6] = 0x00;
2094  value[7] = 0xff;
2095  }
2096  /* These are the values of the address of the video buffer,
2097  * they have to be loaded into the USBVISION_DRM_PRM1-8
2098  *
2099  * Start address of video output buffer for read: drm_prm1-2 -> 0x00000
2100  * End address of video output buffer for read: drm_prm1-3 -> 0x1ffff
2101  * Start address of video frame delay buffer: drm_prm1-4 -> 0x20000
2102  * Only used in compressed mode
2103  * End address of video frame delay buffer: drm_prm1-5-6 -> 0x3ffff
2104  * Only used in compressed mode
2105  * Start address of video output buffer for write: drm_prm1-7 -> 0x00000
2106  * End address of video output buffer for write: drm_prm1-8 -> 0x1ffff
2107  */
2108 
2109  if (!USBVISION_IS_OPERATIONAL(usbvision))
2110  return 0;
2111 
2112  rc = usb_control_msg(usbvision->dev, usb_sndctrlpipe(usbvision->dev, 1),
2113  USBVISION_OP_CODE, /* USBVISION specific code */
2114  USB_DIR_OUT | USB_TYPE_VENDOR |
2115  USB_RECIP_ENDPOINT, 0,
2116  (__u16) USBVISION_DRM_PRM1, value, 8, HZ);
2117 
2118  if (rc < 0) {
2119  dev_err(&usbvision->dev->dev, "%s: ERROR=%d\n", __func__, rc);
2120  return rc;
2121  }
2122 
2123  /* Restart the video buffer logic */
2124  rc = usbvision_write_reg(usbvision, USBVISION_DRM_CONT, USBVISION_RES_UR |
2125  USBVISION_RES_FDL | USBVISION_RES_VDW);
2126  if (rc < 0)
2127  return rc;
2128  rc = usbvision_write_reg(usbvision, USBVISION_DRM_CONT, 0x00);
2129 
2130  return rc;
2131 }
2132 
2133 /*
2134  * ()
2135  *
2136  * Power on the device, enables suspend-resume logic
2137  * & reset the isoc End-Point
2138  *
2139  */
2140 
2141 int usbvision_power_on(struct usb_usbvision *usbvision)
2142 {
2143  int err_code = 0;
2144 
2145  PDEBUG(DBG_FUNC, "");
2146 
2147  usbvision_write_reg(usbvision, USBVISION_PWR_REG, USBVISION_SSPND_EN);
2148  usbvision_write_reg(usbvision, USBVISION_PWR_REG,
2149  USBVISION_SSPND_EN | USBVISION_RES2);
2150 
2151  if (usbvision_device_data[usbvision->dev_model].codec == CODEC_WEBCAM) {
2152  usbvision_write_reg(usbvision, USBVISION_VIN_REG1,
2153  USBVISION_16_422_SYNC | USBVISION_HVALID_PO);
2154  usbvision_write_reg(usbvision, USBVISION_VIN_REG2,
2155  USBVISION_NOHVALID | USBVISION_KEEP_BLANK);
2156  }
2157  usbvision_write_reg(usbvision, USBVISION_PWR_REG,
2158  USBVISION_SSPND_EN | USBVISION_PWR_VID);
2159  mdelay(10);
2160  err_code = usbvision_write_reg(usbvision, USBVISION_PWR_REG,
2161  USBVISION_SSPND_EN | USBVISION_PWR_VID | USBVISION_RES2);
2162  if (err_code == 1)
2163  usbvision->power = 1;
2164  PDEBUG(DBG_FUNC, "%s: err_code %d", (err_code < 0) ? "ERROR" : "power is on", err_code);
2165  return err_code;
2166 }
2167 
2168 
2169 /*
2170  * usbvision timer stuff
2171  */
2172 
2173 /* to call usbvision_power_off from task queue */
2174 static void call_usbvision_power_off(struct work_struct *work)
2175 {
2176  struct usb_usbvision *usbvision = container_of(work, struct usb_usbvision, power_off_work);
2177 
2178  PDEBUG(DBG_FUNC, "");
2179  if (mutex_lock_interruptible(&usbvision->v4l2_lock))
2180  return;
2181 
2182  if (usbvision->user == 0) {
2183  usbvision_i2c_unregister(usbvision);
2184 
2185  usbvision_power_off(usbvision);
2186  usbvision->initialized = 0;
2187  }
2188  mutex_unlock(&usbvision->v4l2_lock);
2189 }
2190 
2191 static void usbvision_power_off_timer(unsigned long data)
2192 {
2193  struct usb_usbvision *usbvision = (void *)data;
2194 
2195  PDEBUG(DBG_FUNC, "");
2196  del_timer(&usbvision->power_off_timer);
2197  INIT_WORK(&usbvision->power_off_work, call_usbvision_power_off);
2198  (void) schedule_work(&usbvision->power_off_work);
2199 }
2200 
2201 void usbvision_init_power_off_timer(struct usb_usbvision *usbvision)
2202 {
2203  init_timer(&usbvision->power_off_timer);
2204  usbvision->power_off_timer.data = (long)usbvision;
2205  usbvision->power_off_timer.function = usbvision_power_off_timer;
2206 }
2207 
2208 void usbvision_set_power_off_timer(struct usb_usbvision *usbvision)
2209 {
2210  mod_timer(&usbvision->power_off_timer, jiffies + USBVISION_POWEROFF_TIME);
2211 }
2212 
2213 void usbvision_reset_power_off_timer(struct usb_usbvision *usbvision)
2214 {
2215  if (timer_pending(&usbvision->power_off_timer))
2216  del_timer(&usbvision->power_off_timer);
2217 }
2218 
2219 /*
2220  * usbvision_begin_streaming()
2221  * Sure you have to put bit 7 to 0, if not incoming frames are droped, but no
2222  * idea about the rest
2223  */
2224 int usbvision_begin_streaming(struct usb_usbvision *usbvision)
2225 {
2226  if (usbvision->isoc_mode == ISOC_MODE_COMPRESS)
2227  usbvision_init_compression(usbvision);
2228  return usbvision_write_reg(usbvision, USBVISION_VIN_REG2,
2229  USBVISION_NOHVALID | usbvision->vin_reg2_preset);
2230 }
2231 
2232 /*
2233  * usbvision_restart_isoc()
2234  * Not sure yet if touching here PWR_REG make loose the config
2235  */
2236 
2237 int usbvision_restart_isoc(struct usb_usbvision *usbvision)
2238 {
2239  int ret;
2240 
2241  ret = usbvision_write_reg(usbvision, USBVISION_PWR_REG,
2242  USBVISION_SSPND_EN | USBVISION_PWR_VID);
2243  if (ret < 0)
2244  return ret;
2245  ret = usbvision_write_reg(usbvision, USBVISION_PWR_REG,
2246  USBVISION_SSPND_EN | USBVISION_PWR_VID |
2247  USBVISION_RES2);
2248  if (ret < 0)
2249  return ret;
2250  ret = usbvision_write_reg(usbvision, USBVISION_VIN_REG2,
2251  USBVISION_KEEP_BLANK | USBVISION_NOHVALID |
2252  usbvision->vin_reg2_preset);
2253  if (ret < 0)
2254  return ret;
2255 
2256  /* TODO: schedule timeout */
2257  while ((usbvision_read_reg(usbvision, USBVISION_STATUS_REG) & 0x01) != 1)
2258  ;
2259 
2260  return 0;
2261 }
2262 
2263 int usbvision_audio_off(struct usb_usbvision *usbvision)
2264 {
2265  if (usbvision_write_reg(usbvision, USBVISION_IOPIN_REG, USBVISION_AUDIO_MUTE) < 0) {
2266  printk(KERN_ERR "usbvision_audio_off: can't write reg\n");
2267  return -1;
2268  }
2269  usbvision->audio_mute = 0;
2270  usbvision->audio_channel = USBVISION_AUDIO_MUTE;
2271  return 0;
2272 }
2273 
2274 int usbvision_set_audio(struct usb_usbvision *usbvision, int audio_channel)
2275 {
2276  if (!usbvision->audio_mute) {
2277  if (usbvision_write_reg(usbvision, USBVISION_IOPIN_REG, audio_channel) < 0) {
2278  printk(KERN_ERR "usbvision_set_audio: can't write iopin register for audio switching\n");
2279  return -1;
2280  }
2281  }
2282  usbvision->audio_channel = audio_channel;
2283  return 0;
2284 }
2285 
2286 int usbvision_setup(struct usb_usbvision *usbvision, int format)
2287 {
2288  if (usbvision_device_data[usbvision->dev_model].codec == CODEC_WEBCAM)
2289  usbvision_init_webcam(usbvision);
2290  usbvision_set_video_format(usbvision, format);
2291  usbvision_set_dram_settings(usbvision);
2292  usbvision_set_compress_params(usbvision);
2293  usbvision_set_input(usbvision);
2294  usbvision_set_output(usbvision, MAX_USB_WIDTH, MAX_USB_HEIGHT);
2295  usbvision_restart_isoc(usbvision);
2296 
2297  /* cosas del PCM */
2298  return USBVISION_IS_OPERATIONAL(usbvision);
2299 }
2300 
2301 int usbvision_set_alternate(struct usb_usbvision *dev)
2302 {
2303  int err_code, prev_alt = dev->iface_alt;
2304  int i;
2305 
2306  dev->iface_alt = 0;
2307  for (i = 0; i < dev->num_alt; i++)
2308  if (dev->alt_max_pkt_size[i] > dev->alt_max_pkt_size[dev->iface_alt])
2309  dev->iface_alt = i;
2310 
2311  if (dev->iface_alt != prev_alt) {
2312  dev->isoc_packet_size = dev->alt_max_pkt_size[dev->iface_alt];
2313  PDEBUG(DBG_FUNC, "setting alternate %d with max_packet_size=%u",
2314  dev->iface_alt, dev->isoc_packet_size);
2315  err_code = usb_set_interface(dev->dev, dev->iface, dev->iface_alt);
2316  if (err_code < 0) {
2317  dev_err(&dev->dev->dev,
2318  "cannot change alternate number to %d (error=%i)\n",
2319  dev->iface_alt, err_code);
2320  return err_code;
2321  }
2322  }
2323 
2324  PDEBUG(DBG_ISOC, "ISO Packet Length:%d", dev->isoc_packet_size);
2325 
2326  return 0;
2327 }
2328 
2329 /*
2330  * usbvision_init_isoc()
2331  *
2332  */
2333 int usbvision_init_isoc(struct usb_usbvision *usbvision)
2334 {
2335  struct usb_device *dev = usbvision->dev;
2336  int buf_idx, err_code, reg_value;
2337  int sb_size;
2338 
2339  if (!USBVISION_IS_OPERATIONAL(usbvision))
2340  return -EFAULT;
2341 
2342  usbvision->cur_frame = NULL;
2343  scratch_reset(usbvision);
2344 
2345  /* Alternate interface 1 is is the biggest frame size */
2346  err_code = usbvision_set_alternate(usbvision);
2347  if (err_code < 0) {
2348  usbvision->last_error = err_code;
2349  return -EBUSY;
2350  }
2351  sb_size = USBVISION_URB_FRAMES * usbvision->isoc_packet_size;
2352 
2353  reg_value = (16 - usbvision_read_reg(usbvision,
2354  USBVISION_ALTER_REG)) & 0x0F;
2355 
2356  usbvision->usb_bandwidth = reg_value >> 1;
2357  PDEBUG(DBG_ISOC, "USB Bandwidth Usage: %dMbit/Sec",
2358  usbvision->usb_bandwidth);
2359 
2360 
2361 
2362  /* We double buffer the Iso lists */
2363 
2364  for (buf_idx = 0; buf_idx < USBVISION_NUMSBUF; buf_idx++) {
2365  int j, k;
2366  struct urb *urb;
2367 
2368  urb = usb_alloc_urb(USBVISION_URB_FRAMES, GFP_KERNEL);
2369  if (urb == NULL) {
2370  dev_err(&usbvision->dev->dev,
2371  "%s: usb_alloc_urb() failed\n", __func__);
2372  return -ENOMEM;
2373  }
2374  usbvision->sbuf[buf_idx].urb = urb;
2375  usbvision->sbuf[buf_idx].data =
2376  usb_alloc_coherent(usbvision->dev,
2377  sb_size,
2378  GFP_KERNEL,
2379  &urb->transfer_dma);
2380  urb->dev = dev;
2381  urb->context = usbvision;
2382  urb->pipe = usb_rcvisocpipe(dev, usbvision->video_endp);
2383  urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
2384  urb->interval = 1;
2385  urb->transfer_buffer = usbvision->sbuf[buf_idx].data;
2386  urb->complete = usbvision_isoc_irq;
2387  urb->number_of_packets = USBVISION_URB_FRAMES;
2388  urb->transfer_buffer_length =
2389  usbvision->isoc_packet_size * USBVISION_URB_FRAMES;
2390  for (j = k = 0; j < USBVISION_URB_FRAMES; j++,
2391  k += usbvision->isoc_packet_size) {
2392  urb->iso_frame_desc[j].offset = k;
2393  urb->iso_frame_desc[j].length =
2394  usbvision->isoc_packet_size;
2395  }
2396  }
2397 
2398  /* Submit all URBs */
2399  for (buf_idx = 0; buf_idx < USBVISION_NUMSBUF; buf_idx++) {
2400  err_code = usb_submit_urb(usbvision->sbuf[buf_idx].urb,
2401  GFP_KERNEL);
2402  if (err_code) {
2403  dev_err(&usbvision->dev->dev,
2404  "%s: usb_submit_urb(%d) failed: error %d\n",
2405  __func__, buf_idx, err_code);
2406  }
2407  }
2408 
2409  usbvision->streaming = stream_idle;
2410  PDEBUG(DBG_ISOC, "%s: streaming=1 usbvision->video_endp=$%02x",
2411  __func__,
2412  usbvision->video_endp);
2413  return 0;
2414 }
2415 
2416 /*
2417  * usbvision_stop_isoc()
2418  *
2419  * This procedure stops streaming and deallocates URBs. Then it
2420  * activates zero-bandwidth alt. setting of the video interface.
2421  *
2422  */
2423 void usbvision_stop_isoc(struct usb_usbvision *usbvision)
2424 {
2425  int buf_idx, err_code, reg_value;
2426  int sb_size = USBVISION_URB_FRAMES * usbvision->isoc_packet_size;
2427 
2428  if ((usbvision->streaming == stream_off) || (usbvision->dev == NULL))
2429  return;
2430 
2431  /* Unschedule all of the iso td's */
2432  for (buf_idx = 0; buf_idx < USBVISION_NUMSBUF; buf_idx++) {
2433  usb_kill_urb(usbvision->sbuf[buf_idx].urb);
2434  if (usbvision->sbuf[buf_idx].data) {
2435  usb_free_coherent(usbvision->dev,
2436  sb_size,
2437  usbvision->sbuf[buf_idx].data,
2438  usbvision->sbuf[buf_idx].urb->transfer_dma);
2439  }
2440  usb_free_urb(usbvision->sbuf[buf_idx].urb);
2441  usbvision->sbuf[buf_idx].urb = NULL;
2442  }
2443 
2444  PDEBUG(DBG_ISOC, "%s: streaming=stream_off\n", __func__);
2445  usbvision->streaming = stream_off;
2446 
2447  if (!usbvision->remove_pending) {
2448  /* Set packet size to 0 */
2449  usbvision->iface_alt = 0;
2450  err_code = usb_set_interface(usbvision->dev, usbvision->iface,
2451  usbvision->iface_alt);
2452  if (err_code < 0) {
2453  dev_err(&usbvision->dev->dev,
2454  "%s: usb_set_interface() failed: error %d\n",
2455  __func__, err_code);
2456  usbvision->last_error = err_code;
2457  }
2458  reg_value = (16-usbvision_read_reg(usbvision, USBVISION_ALTER_REG)) & 0x0F;
2459  usbvision->isoc_packet_size =
2460  (reg_value == 0) ? 0 : (reg_value * 64) - 1;
2461  PDEBUG(DBG_ISOC, "ISO Packet Length:%d",
2462  usbvision->isoc_packet_size);
2463 
2464  usbvision->usb_bandwidth = reg_value >> 1;
2465  PDEBUG(DBG_ISOC, "USB Bandwidth Usage: %dMbit/Sec",
2466  usbvision->usb_bandwidth);
2467  }
2468 }
2469 
2470 int usbvision_muxsel(struct usb_usbvision *usbvision, int channel)
2471 {
2472  /* inputs #0 and #3 are constant for every SAA711x. */
2473  /* inputs #1 and #2 are variable for SAA7111 and SAA7113 */
2474  int mode[4] = { SAA7115_COMPOSITE0, 0, 0, SAA7115_COMPOSITE3 };
2475  int audio[] = { 1, 0, 0, 0 };
2476  /* channel 0 is TV with audiochannel 1 (tuner mono) */
2477  /* channel 1 is Composite with audio channel 0 (line in) */
2478  /* channel 2 is S-Video with audio channel 0 (line in) */
2479  /* channel 3 is additional video inputs to the device with audio channel 0 (line in) */
2480 
2481  RESTRICT_TO_RANGE(channel, 0, usbvision->video_inputs);
2482  usbvision->ctl_input = channel;
2483 
2484  /* set the new channel */
2485  /* Regular USB TV Tuners -> channel: 0 = Television, 1 = Composite, 2 = S-Video */
2486  /* Four video input devices -> channel: 0 = Chan White, 1 = Chan Green, 2 = Chan Yellow, 3 = Chan Red */
2487 
2488  switch (usbvision_device_data[usbvision->dev_model].codec) {
2489  case CODEC_SAA7113:
2490  mode[1] = SAA7115_COMPOSITE2;
2491  if (switch_svideo_input) {
2492  /* To handle problems with S-Video Input for
2493  * some devices. Use switch_svideo_input
2494  * parameter when loading the module.*/
2495  mode[2] = SAA7115_COMPOSITE1;
2496  } else {
2497  mode[2] = SAA7115_SVIDEO1;
2498  }
2499  break;
2500  case CODEC_SAA7111:
2501  default:
2502  /* modes for saa7111 */
2503  mode[1] = SAA7115_COMPOSITE1;
2504  mode[2] = SAA7115_SVIDEO1;
2505  break;
2506  }
2507  call_all(usbvision, video, s_routing, mode[channel], 0, 0);
2508  usbvision_set_audio(usbvision, audio[channel]);
2509  return 0;
2510 }
2511 
2512 /*
2513  * Overrides for Emacs so that we follow Linus's tabbing style.
2514  * ---------------------------------------------------------------------------
2515  * Local variables:
2516  * c-basic-offset: 8
2517  * End:
2518  */
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