1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | cx231xx_vbi.c - driver for Conexant Cx23100/101/102 USB video capture devices |
4 | |
5 | Copyright (C) 2008 <srinivasa.deevi at conexant dot com> |
6 | Based on cx88 driver |
7 | |
8 | */ |
9 | |
10 | #include "cx231xx.h" |
11 | #include <linux/init.h> |
12 | #include <linux/list.h> |
13 | #include <linux/module.h> |
14 | #include <linux/kernel.h> |
15 | #include <linux/bitmap.h> |
16 | #include <linux/i2c.h> |
17 | #include <linux/mm.h> |
18 | #include <linux/mutex.h> |
19 | #include <linux/slab.h> |
20 | |
21 | #include <media/v4l2-common.h> |
22 | #include <media/v4l2-ioctl.h> |
23 | #include <media/drv-intf/msp3400.h> |
24 | #include <media/tuner.h> |
25 | |
26 | #include "cx231xx-vbi.h" |
27 | |
28 | static inline void print_err_status(struct cx231xx *dev, int packet, int status) |
29 | { |
30 | char *errmsg = "Unknown" ; |
31 | |
32 | switch (status) { |
33 | case -ENOENT: |
34 | errmsg = "unlinked synchronously" ; |
35 | break; |
36 | case -ECONNRESET: |
37 | errmsg = "unlinked asynchronously" ; |
38 | break; |
39 | case -ENOSR: |
40 | errmsg = "Buffer error (overrun)" ; |
41 | break; |
42 | case -EPIPE: |
43 | errmsg = "Stalled (device not responding)" ; |
44 | break; |
45 | case -EOVERFLOW: |
46 | errmsg = "Babble (bad cable?)" ; |
47 | break; |
48 | case -EPROTO: |
49 | errmsg = "Bit-stuff error (bad cable?)" ; |
50 | break; |
51 | case -EILSEQ: |
52 | errmsg = "CRC/Timeout (could be anything)" ; |
53 | break; |
54 | case -ETIME: |
55 | errmsg = "Device does not respond" ; |
56 | break; |
57 | } |
58 | if (packet < 0) { |
59 | dev_err(dev->dev, |
60 | "URB status %d [%s].\n" , status, errmsg); |
61 | } else { |
62 | dev_err(dev->dev, |
63 | "URB packet %d, status %d [%s].\n" , |
64 | packet, status, errmsg); |
65 | } |
66 | } |
67 | |
68 | /* |
69 | * Controls the isoc copy of each urb packet |
70 | */ |
71 | static inline int cx231xx_isoc_vbi_copy(struct cx231xx *dev, struct urb *urb) |
72 | { |
73 | struct cx231xx_dmaqueue *dma_q = urb->context; |
74 | int rc = 1; |
75 | unsigned char *p_buffer; |
76 | u32 bytes_parsed = 0, buffer_size = 0; |
77 | u8 sav_eav = 0; |
78 | |
79 | if (!dev) |
80 | return 0; |
81 | |
82 | if (dev->state & DEV_DISCONNECTED) |
83 | return 0; |
84 | |
85 | if (urb->status < 0) { |
86 | print_err_status(dev, packet: -1, status: urb->status); |
87 | if (urb->status == -ENOENT) |
88 | return 0; |
89 | } |
90 | |
91 | /* get buffer pointer and length */ |
92 | p_buffer = urb->transfer_buffer; |
93 | buffer_size = urb->actual_length; |
94 | |
95 | if (buffer_size > 0) { |
96 | bytes_parsed = 0; |
97 | |
98 | if (dma_q->is_partial_line) { |
99 | /* Handle the case where we were working on a partial |
100 | line */ |
101 | sav_eav = dma_q->last_sav; |
102 | } else { |
103 | /* Check for a SAV/EAV overlapping the |
104 | buffer boundary */ |
105 | |
106 | sav_eav = cx231xx_find_boundary_SAV_EAV(p_buffer, |
107 | partial_buf: dma_q->partial_buf, |
108 | p_bytes_used: &bytes_parsed); |
109 | } |
110 | |
111 | sav_eav &= 0xF0; |
112 | /* Get the first line if we have some portion of an SAV/EAV from |
113 | the last buffer or a partial line */ |
114 | if (sav_eav) { |
115 | bytes_parsed += cx231xx_get_vbi_line(dev, dma_q, |
116 | sav_eav, /* SAV/EAV */ |
117 | p_buffer: p_buffer + bytes_parsed, /* p_buffer */ |
118 | buffer_size: buffer_size - bytes_parsed); /* buffer size */ |
119 | } |
120 | |
121 | /* Now parse data that is completely in this buffer */ |
122 | dma_q->is_partial_line = 0; |
123 | |
124 | while (bytes_parsed < buffer_size) { |
125 | u32 bytes_used = 0; |
126 | |
127 | sav_eav = cx231xx_find_next_SAV_EAV( |
128 | p_buffer: p_buffer + bytes_parsed, /* p_buffer */ |
129 | buffer_size: buffer_size - bytes_parsed, /* buffer size */ |
130 | p_bytes_used: &bytes_used); /* bytes used to get SAV/EAV */ |
131 | |
132 | bytes_parsed += bytes_used; |
133 | |
134 | sav_eav &= 0xF0; |
135 | if (sav_eav && (bytes_parsed < buffer_size)) { |
136 | bytes_parsed += cx231xx_get_vbi_line(dev, |
137 | dma_q, sav_eav, /* SAV/EAV */ |
138 | p_buffer: p_buffer+bytes_parsed, /* p_buffer */ |
139 | buffer_size: buffer_size-bytes_parsed);/*buf size*/ |
140 | } |
141 | } |
142 | |
143 | /* Save the last four bytes of the buffer so we can |
144 | check the buffer boundary condition next time */ |
145 | memcpy(dma_q->partial_buf, p_buffer + buffer_size - 4, 4); |
146 | bytes_parsed = 0; |
147 | } |
148 | |
149 | return rc; |
150 | } |
151 | |
152 | /* ------------------------------------------------------------------ |
153 | Vbi buf operations |
154 | ------------------------------------------------------------------*/ |
155 | |
156 | static int vbi_queue_setup(struct vb2_queue *vq, |
157 | unsigned int *nbuffers, unsigned int *nplanes, |
158 | unsigned int sizes[], struct device *alloc_devs[]) |
159 | { |
160 | struct cx231xx *dev = vb2_get_drv_priv(q: vq); |
161 | u32 height = 0; |
162 | |
163 | height = ((dev->norm & V4L2_STD_625_50) ? |
164 | PAL_VBI_LINES : NTSC_VBI_LINES); |
165 | |
166 | *nplanes = 1; |
167 | sizes[0] = (dev->width * height * 2 * 2); |
168 | return 0; |
169 | } |
170 | |
171 | /* This is called *without* dev->slock held; please keep it that way */ |
172 | static int vbi_buf_prepare(struct vb2_buffer *vb) |
173 | { |
174 | struct cx231xx *dev = vb2_get_drv_priv(q: vb->vb2_queue); |
175 | u32 height = 0; |
176 | u32 size; |
177 | |
178 | height = ((dev->norm & V4L2_STD_625_50) ? |
179 | PAL_VBI_LINES : NTSC_VBI_LINES); |
180 | size = ((dev->width << 1) * height * 2); |
181 | |
182 | if (vb2_plane_size(vb, plane_no: 0) < size) |
183 | return -EINVAL; |
184 | vb2_set_plane_payload(vb, plane_no: 0, size); |
185 | return 0; |
186 | } |
187 | |
188 | static void vbi_buf_queue(struct vb2_buffer *vb) |
189 | { |
190 | struct cx231xx *dev = vb2_get_drv_priv(q: vb->vb2_queue); |
191 | struct cx231xx_buffer *buf = |
192 | container_of(vb, struct cx231xx_buffer, vb.vb2_buf); |
193 | struct cx231xx_dmaqueue *vidq = &dev->vbi_mode.vidq; |
194 | unsigned long flags; |
195 | |
196 | spin_lock_irqsave(&dev->vbi_mode.slock, flags); |
197 | list_add_tail(new: &buf->list, head: &vidq->active); |
198 | spin_unlock_irqrestore(lock: &dev->vbi_mode.slock, flags); |
199 | } |
200 | |
201 | static void return_all_buffers(struct cx231xx *dev, |
202 | enum vb2_buffer_state state) |
203 | { |
204 | struct cx231xx_dmaqueue *vidq = &dev->vbi_mode.vidq; |
205 | struct cx231xx_buffer *buf, *node; |
206 | unsigned long flags; |
207 | |
208 | spin_lock_irqsave(&dev->vbi_mode.slock, flags); |
209 | dev->vbi_mode.bulk_ctl.buf = NULL; |
210 | list_for_each_entry_safe(buf, node, &vidq->active, list) { |
211 | list_del(entry: &buf->list); |
212 | vb2_buffer_done(vb: &buf->vb.vb2_buf, state); |
213 | } |
214 | spin_unlock_irqrestore(lock: &dev->vbi_mode.slock, flags); |
215 | } |
216 | |
217 | static int vbi_start_streaming(struct vb2_queue *vq, unsigned int count) |
218 | { |
219 | struct cx231xx *dev = vb2_get_drv_priv(q: vq); |
220 | struct cx231xx_dmaqueue *vidq = &dev->vbi_mode.vidq; |
221 | int ret; |
222 | |
223 | vidq->sequence = 0; |
224 | ret = cx231xx_init_vbi_isoc(dev, CX231XX_NUM_VBI_PACKETS, |
225 | CX231XX_NUM_VBI_BUFS, |
226 | max_pkt_size: dev->vbi_mode.alt_max_pkt_size[0], |
227 | bulk_copy: cx231xx_isoc_vbi_copy); |
228 | if (ret) |
229 | return_all_buffers(dev, state: VB2_BUF_STATE_QUEUED); |
230 | return ret; |
231 | } |
232 | |
233 | static void vbi_stop_streaming(struct vb2_queue *vq) |
234 | { |
235 | struct cx231xx *dev = vb2_get_drv_priv(q: vq); |
236 | |
237 | return_all_buffers(dev, state: VB2_BUF_STATE_ERROR); |
238 | } |
239 | |
240 | struct vb2_ops cx231xx_vbi_qops = { |
241 | .queue_setup = vbi_queue_setup, |
242 | .buf_prepare = vbi_buf_prepare, |
243 | .buf_queue = vbi_buf_queue, |
244 | .start_streaming = vbi_start_streaming, |
245 | .stop_streaming = vbi_stop_streaming, |
246 | .wait_prepare = vb2_ops_wait_prepare, |
247 | .wait_finish = vb2_ops_wait_finish, |
248 | }; |
249 | |
250 | /* ------------------------------------------------------------------ |
251 | URB control |
252 | ------------------------------------------------------------------*/ |
253 | |
254 | /* |
255 | * IRQ callback, called by URB callback |
256 | */ |
257 | static void cx231xx_irq_vbi_callback(struct urb *urb) |
258 | { |
259 | struct cx231xx_dmaqueue *dma_q = urb->context; |
260 | struct cx231xx_video_mode *vmode = |
261 | container_of(dma_q, struct cx231xx_video_mode, vidq); |
262 | struct cx231xx *dev = container_of(vmode, struct cx231xx, vbi_mode); |
263 | unsigned long flags; |
264 | |
265 | switch (urb->status) { |
266 | case 0: /* success */ |
267 | case -ETIMEDOUT: /* NAK */ |
268 | break; |
269 | case -ECONNRESET: /* kill */ |
270 | case -ENOENT: |
271 | case -ESHUTDOWN: |
272 | return; |
273 | default: /* error */ |
274 | dev_err(dev->dev, |
275 | "urb completion error %d.\n" , urb->status); |
276 | break; |
277 | } |
278 | |
279 | /* Copy data from URB */ |
280 | spin_lock_irqsave(&dev->vbi_mode.slock, flags); |
281 | dev->vbi_mode.bulk_ctl.bulk_copy(dev, urb); |
282 | spin_unlock_irqrestore(lock: &dev->vbi_mode.slock, flags); |
283 | |
284 | /* Reset status */ |
285 | urb->status = 0; |
286 | |
287 | urb->status = usb_submit_urb(urb, GFP_ATOMIC); |
288 | if (urb->status) { |
289 | dev_err(dev->dev, "urb resubmit failed (error=%i)\n" , |
290 | urb->status); |
291 | } |
292 | } |
293 | |
294 | /* |
295 | * Stop and Deallocate URBs |
296 | */ |
297 | void cx231xx_uninit_vbi_isoc(struct cx231xx *dev) |
298 | { |
299 | struct urb *urb; |
300 | int i; |
301 | |
302 | dev_dbg(dev->dev, "called cx231xx_uninit_vbi_isoc\n" ); |
303 | |
304 | dev->vbi_mode.bulk_ctl.nfields = -1; |
305 | for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) { |
306 | urb = dev->vbi_mode.bulk_ctl.urb[i]; |
307 | if (urb) { |
308 | if (!irqs_disabled()) |
309 | usb_kill_urb(urb); |
310 | else |
311 | usb_unlink_urb(urb); |
312 | |
313 | if (dev->vbi_mode.bulk_ctl.transfer_buffer[i]) { |
314 | |
315 | kfree(objp: dev->vbi_mode.bulk_ctl. |
316 | transfer_buffer[i]); |
317 | dev->vbi_mode.bulk_ctl.transfer_buffer[i] = |
318 | NULL; |
319 | } |
320 | usb_free_urb(urb); |
321 | dev->vbi_mode.bulk_ctl.urb[i] = NULL; |
322 | } |
323 | dev->vbi_mode.bulk_ctl.transfer_buffer[i] = NULL; |
324 | } |
325 | |
326 | kfree(objp: dev->vbi_mode.bulk_ctl.urb); |
327 | kfree(objp: dev->vbi_mode.bulk_ctl.transfer_buffer); |
328 | |
329 | dev->vbi_mode.bulk_ctl.urb = NULL; |
330 | dev->vbi_mode.bulk_ctl.transfer_buffer = NULL; |
331 | dev->vbi_mode.bulk_ctl.num_bufs = 0; |
332 | |
333 | cx231xx_capture_start(dev, start: 0, media_type: Vbi); |
334 | } |
335 | EXPORT_SYMBOL_GPL(cx231xx_uninit_vbi_isoc); |
336 | |
337 | /* |
338 | * Allocate URBs and start IRQ |
339 | */ |
340 | int cx231xx_init_vbi_isoc(struct cx231xx *dev, int max_packets, |
341 | int num_bufs, int max_pkt_size, |
342 | int (*bulk_copy) (struct cx231xx *dev, |
343 | struct urb *urb)) |
344 | { |
345 | struct cx231xx_dmaqueue *dma_q = &dev->vbi_mode.vidq; |
346 | int i; |
347 | int sb_size, pipe; |
348 | struct urb *urb; |
349 | int rc; |
350 | |
351 | dev_dbg(dev->dev, "called cx231xx_vbi_isoc\n" ); |
352 | |
353 | /* De-allocates all pending stuff */ |
354 | cx231xx_uninit_vbi_isoc(dev); |
355 | |
356 | /* clear if any halt */ |
357 | usb_clear_halt(dev: dev->udev, |
358 | usb_rcvbulkpipe(dev->udev, |
359 | dev->vbi_mode.end_point_addr)); |
360 | |
361 | dev->vbi_mode.bulk_ctl.bulk_copy = bulk_copy; |
362 | dev->vbi_mode.bulk_ctl.num_bufs = num_bufs; |
363 | dma_q->pos = 0; |
364 | dma_q->is_partial_line = 0; |
365 | dma_q->last_sav = 0; |
366 | dma_q->current_field = -1; |
367 | dma_q->bytes_left_in_line = dev->width << 1; |
368 | dma_q->lines_per_field = ((dev->norm & V4L2_STD_625_50) ? |
369 | PAL_VBI_LINES : NTSC_VBI_LINES); |
370 | dma_q->lines_completed = 0; |
371 | for (i = 0; i < 8; i++) |
372 | dma_q->partial_buf[i] = 0; |
373 | |
374 | dev->vbi_mode.bulk_ctl.urb = kcalloc(n: num_bufs, size: sizeof(void *), |
375 | GFP_KERNEL); |
376 | if (!dev->vbi_mode.bulk_ctl.urb) { |
377 | dev_err(dev->dev, |
378 | "cannot alloc memory for usb buffers\n" ); |
379 | return -ENOMEM; |
380 | } |
381 | |
382 | dev->vbi_mode.bulk_ctl.transfer_buffer = |
383 | kcalloc(n: num_bufs, size: sizeof(void *), GFP_KERNEL); |
384 | if (!dev->vbi_mode.bulk_ctl.transfer_buffer) { |
385 | dev_err(dev->dev, |
386 | "cannot allocate memory for usbtransfer\n" ); |
387 | kfree(objp: dev->vbi_mode.bulk_ctl.urb); |
388 | return -ENOMEM; |
389 | } |
390 | |
391 | dev->vbi_mode.bulk_ctl.max_pkt_size = max_pkt_size; |
392 | dev->vbi_mode.bulk_ctl.buf = NULL; |
393 | |
394 | sb_size = max_packets * dev->vbi_mode.bulk_ctl.max_pkt_size; |
395 | |
396 | /* allocate urbs and transfer buffers */ |
397 | for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) { |
398 | |
399 | urb = usb_alloc_urb(iso_packets: 0, GFP_KERNEL); |
400 | if (!urb) { |
401 | cx231xx_uninit_vbi_isoc(dev); |
402 | return -ENOMEM; |
403 | } |
404 | dev->vbi_mode.bulk_ctl.urb[i] = urb; |
405 | urb->transfer_flags = 0; |
406 | |
407 | dev->vbi_mode.bulk_ctl.transfer_buffer[i] = |
408 | kzalloc(size: sb_size, GFP_KERNEL); |
409 | if (!dev->vbi_mode.bulk_ctl.transfer_buffer[i]) { |
410 | dev_err(dev->dev, |
411 | "unable to allocate %i bytes for transfer buffer %i\n" , |
412 | sb_size, i); |
413 | cx231xx_uninit_vbi_isoc(dev); |
414 | return -ENOMEM; |
415 | } |
416 | |
417 | pipe = usb_rcvbulkpipe(dev->udev, dev->vbi_mode.end_point_addr); |
418 | usb_fill_bulk_urb(urb, dev: dev->udev, pipe, |
419 | transfer_buffer: dev->vbi_mode.bulk_ctl.transfer_buffer[i], |
420 | buffer_length: sb_size, complete_fn: cx231xx_irq_vbi_callback, context: dma_q); |
421 | } |
422 | |
423 | init_waitqueue_head(&dma_q->wq); |
424 | |
425 | /* submit urbs and enables IRQ */ |
426 | for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) { |
427 | rc = usb_submit_urb(urb: dev->vbi_mode.bulk_ctl.urb[i], GFP_ATOMIC); |
428 | if (rc) { |
429 | dev_err(dev->dev, |
430 | "submit of urb %i failed (error=%i)\n" , i, rc); |
431 | cx231xx_uninit_vbi_isoc(dev); |
432 | return rc; |
433 | } |
434 | } |
435 | |
436 | cx231xx_capture_start(dev, start: 1, media_type: Vbi); |
437 | |
438 | return 0; |
439 | } |
440 | EXPORT_SYMBOL_GPL(cx231xx_init_vbi_isoc); |
441 | |
442 | u32 cx231xx_get_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q, |
443 | u8 sav_eav, u8 *p_buffer, u32 buffer_size) |
444 | { |
445 | u32 bytes_copied = 0; |
446 | int current_field = -1; |
447 | |
448 | switch (sav_eav) { |
449 | |
450 | case SAV_VBI_FIELD1: |
451 | current_field = 1; |
452 | break; |
453 | |
454 | case SAV_VBI_FIELD2: |
455 | current_field = 2; |
456 | break; |
457 | default: |
458 | break; |
459 | } |
460 | |
461 | if (current_field < 0) |
462 | return bytes_copied; |
463 | |
464 | dma_q->last_sav = sav_eav; |
465 | |
466 | bytes_copied = |
467 | cx231xx_copy_vbi_line(dev, dma_q, p_line: p_buffer, length: buffer_size, |
468 | field_number: current_field); |
469 | |
470 | return bytes_copied; |
471 | } |
472 | |
473 | /* |
474 | * Announces that a buffer were filled and request the next |
475 | */ |
476 | static inline void vbi_buffer_filled(struct cx231xx *dev, |
477 | struct cx231xx_dmaqueue *dma_q, |
478 | struct cx231xx_buffer *buf) |
479 | { |
480 | /* Advice that buffer was filled */ |
481 | /* dev_dbg(dev->dev, "[%p/%d] wakeup\n", buf, buf->vb.index); */ |
482 | |
483 | buf->vb.sequence = dma_q->sequence++; |
484 | buf->vb.vb2_buf.timestamp = ktime_get_ns(); |
485 | |
486 | dev->vbi_mode.bulk_ctl.buf = NULL; |
487 | |
488 | list_del(entry: &buf->list); |
489 | vb2_buffer_done(vb: &buf->vb.vb2_buf, state: VB2_BUF_STATE_DONE); |
490 | } |
491 | |
492 | u32 cx231xx_copy_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q, |
493 | u8 *p_line, u32 length, int field_number) |
494 | { |
495 | u32 bytes_to_copy; |
496 | struct cx231xx_buffer *buf; |
497 | u32 _line_size = dev->width * 2; |
498 | |
499 | if (dma_q->current_field == -1) { |
500 | /* Just starting up */ |
501 | cx231xx_reset_vbi_buffer(dev, dma_q); |
502 | } |
503 | |
504 | if (dma_q->current_field != field_number) |
505 | dma_q->lines_completed = 0; |
506 | |
507 | /* get the buffer pointer */ |
508 | buf = dev->vbi_mode.bulk_ctl.buf; |
509 | |
510 | /* Remember the field number for next time */ |
511 | dma_q->current_field = field_number; |
512 | |
513 | bytes_to_copy = dma_q->bytes_left_in_line; |
514 | if (bytes_to_copy > length) |
515 | bytes_to_copy = length; |
516 | |
517 | if (dma_q->lines_completed >= dma_q->lines_per_field) { |
518 | dma_q->bytes_left_in_line -= bytes_to_copy; |
519 | dma_q->is_partial_line = |
520 | (dma_q->bytes_left_in_line == 0) ? 0 : 1; |
521 | return 0; |
522 | } |
523 | |
524 | dma_q->is_partial_line = 1; |
525 | |
526 | /* If we don't have a buffer, just return the number of bytes we would |
527 | have copied if we had a buffer. */ |
528 | if (!buf) { |
529 | dma_q->bytes_left_in_line -= bytes_to_copy; |
530 | dma_q->is_partial_line = |
531 | (dma_q->bytes_left_in_line == 0) ? 0 : 1; |
532 | return bytes_to_copy; |
533 | } |
534 | |
535 | /* copy the data to video buffer */ |
536 | cx231xx_do_vbi_copy(dev, dma_q, p_buffer: p_line, bytes_to_copy); |
537 | |
538 | dma_q->pos += bytes_to_copy; |
539 | dma_q->bytes_left_in_line -= bytes_to_copy; |
540 | |
541 | if (dma_q->bytes_left_in_line == 0) { |
542 | |
543 | dma_q->bytes_left_in_line = _line_size; |
544 | dma_q->lines_completed++; |
545 | dma_q->is_partial_line = 0; |
546 | |
547 | if (cx231xx_is_vbi_buffer_done(dev, dma_q) && buf) { |
548 | |
549 | vbi_buffer_filled(dev, dma_q, buf); |
550 | |
551 | dma_q->pos = 0; |
552 | dma_q->lines_completed = 0; |
553 | cx231xx_reset_vbi_buffer(dev, dma_q); |
554 | } |
555 | } |
556 | |
557 | return bytes_to_copy; |
558 | } |
559 | |
560 | /* |
561 | * generic routine to get the next available buffer |
562 | */ |
563 | static inline void get_next_vbi_buf(struct cx231xx_dmaqueue *dma_q, |
564 | struct cx231xx_buffer **buf) |
565 | { |
566 | struct cx231xx_video_mode *vmode = |
567 | container_of(dma_q, struct cx231xx_video_mode, vidq); |
568 | struct cx231xx *dev = container_of(vmode, struct cx231xx, vbi_mode); |
569 | char *outp; |
570 | |
571 | if (list_empty(head: &dma_q->active)) { |
572 | dev_err(dev->dev, "No active queue to serve\n" ); |
573 | dev->vbi_mode.bulk_ctl.buf = NULL; |
574 | *buf = NULL; |
575 | return; |
576 | } |
577 | |
578 | /* Get the next buffer */ |
579 | *buf = list_entry(dma_q->active.next, struct cx231xx_buffer, list); |
580 | |
581 | /* Cleans up buffer - Useful for testing for frame/URB loss */ |
582 | outp = vb2_plane_vaddr(vb: &(*buf)->vb.vb2_buf, plane_no: 0); |
583 | memset(outp, 0, vb2_plane_size(&(*buf)->vb.vb2_buf, 0)); |
584 | |
585 | dev->vbi_mode.bulk_ctl.buf = *buf; |
586 | |
587 | return; |
588 | } |
589 | |
590 | void cx231xx_reset_vbi_buffer(struct cx231xx *dev, |
591 | struct cx231xx_dmaqueue *dma_q) |
592 | { |
593 | struct cx231xx_buffer *buf; |
594 | |
595 | buf = dev->vbi_mode.bulk_ctl.buf; |
596 | |
597 | if (buf == NULL) { |
598 | /* first try to get the buffer */ |
599 | get_next_vbi_buf(dma_q, buf: &buf); |
600 | |
601 | dma_q->pos = 0; |
602 | dma_q->current_field = -1; |
603 | } |
604 | |
605 | dma_q->bytes_left_in_line = dev->width << 1; |
606 | dma_q->lines_completed = 0; |
607 | } |
608 | |
609 | int cx231xx_do_vbi_copy(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q, |
610 | u8 *p_buffer, u32 bytes_to_copy) |
611 | { |
612 | u8 *p_out_buffer = NULL; |
613 | u32 current_line_bytes_copied = 0; |
614 | struct cx231xx_buffer *buf; |
615 | u32 _line_size = dev->width << 1; |
616 | void *startwrite; |
617 | int offset, lencopy; |
618 | |
619 | buf = dev->vbi_mode.bulk_ctl.buf; |
620 | |
621 | if (buf == NULL) |
622 | return -EINVAL; |
623 | |
624 | p_out_buffer = vb2_plane_vaddr(vb: &buf->vb.vb2_buf, plane_no: 0); |
625 | |
626 | if (dma_q->bytes_left_in_line != _line_size) { |
627 | current_line_bytes_copied = |
628 | _line_size - dma_q->bytes_left_in_line; |
629 | } |
630 | |
631 | offset = (dma_q->lines_completed * _line_size) + |
632 | current_line_bytes_copied; |
633 | |
634 | if (dma_q->current_field == 2) { |
635 | /* Populate the second half of the frame */ |
636 | offset += (dev->width * 2 * dma_q->lines_per_field); |
637 | } |
638 | |
639 | /* prepare destination address */ |
640 | startwrite = p_out_buffer + offset; |
641 | |
642 | lencopy = dma_q->bytes_left_in_line > bytes_to_copy ? |
643 | bytes_to_copy : dma_q->bytes_left_in_line; |
644 | |
645 | memcpy(startwrite, p_buffer, lencopy); |
646 | |
647 | return 0; |
648 | } |
649 | |
650 | u8 cx231xx_is_vbi_buffer_done(struct cx231xx *dev, |
651 | struct cx231xx_dmaqueue *dma_q) |
652 | { |
653 | u32 height = 0; |
654 | |
655 | height = ((dev->norm & V4L2_STD_625_50) ? |
656 | PAL_VBI_LINES : NTSC_VBI_LINES); |
657 | if (dma_q->lines_completed == height && dma_q->current_field == 2) |
658 | return 1; |
659 | else |
660 | return 0; |
661 | } |
662 | |