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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, -1, 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 | dma_q->partial_buf, | |
108 | &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 + bytes_parsed, /* p_buffer */ | |
118 | 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 + bytes_parsed, /* p_buffer */ | |
129 | buffer_size - bytes_parsed, /* buffer size */ | |
130 | &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+bytes_parsed, /* p_buffer */ | |
139 | 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(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(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, 0) < size) | |
183 | return -EINVAL; | |
184 | vb2_set_plane_payload(vb, 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(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(&buf->list, &vidq->active); | |
198 | spin_unlock_irqrestore(&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(&buf->list); | |
212 | vb2_buffer_done(&buf->vb.vb2_buf, state); | |
213 | } | |
214 | spin_unlock_irqrestore(&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(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 | dev->vbi_mode.alt_max_pkt_size[0], | |
227 | cx231xx_isoc_vbi_copy); | |
228 | if (ret) | |
229 | return_all_buffers(dev, 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(vq); | |
236 | ||
237 | return_all_buffers(dev, 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(&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(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(dev->vbi_mode.bulk_ctl.urb); | |
327 | kfree(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, 0, 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->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(num_bufs, 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(num_bufs, 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(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(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(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->udev, pipe, | |
419 | dev->vbi_mode.bulk_ctl.transfer_buffer[i], | |
420 | sb_size, cx231xx_irq_vbi_callback, 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(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, 1, 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_buffer, buffer_size, | |
468 | 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(&buf->list); | |
489 | vb2_buffer_done(&buf->vb.vb2_buf, 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_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 | * video-buf 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(&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(&(*buf)->vb.vb2_buf, 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); | |
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(&buf->vb.vb2_buf, 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 | } |