ivtv-fileops.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3    file operation functions
   4    Copyright (C) 2003-2004  Kevin Thayer <nufan_wfk at yahoo.com>
   5    Copyright (C) 2004  Chris Kennedy <c@groovy.org>
   6    Copyright (C) 2005-2007  Hans Verkuil <hverkuil@kernel.org>
   7
   8 */
   9
  10#include "ivtv-driver.h"
  11#include "ivtv-fileops.h"
  12#include "ivtv-i2c.h"
  13#include "ivtv-queue.h"
  14#include "ivtv-udma.h"
  15#include "ivtv-irq.h"
  16#include "ivtv-vbi.h"
  17#include "ivtv-mailbox.h"
  18#include "ivtv-routing.h"
  19#include "ivtv-streams.h"
  20#include "ivtv-yuv.h"
  21#include "ivtv-ioctl.h"
  22#include "ivtv-cards.h"
  23#include "ivtv-firmware.h"
  24#include <linux/lockdep.h>
  25#include <media/v4l2-event.h>
  26#include <media/i2c/saa7115.h>
  27
  28/* This function tries to claim the stream for a specific file descriptor.
  29   If no one else is using this stream then the stream is claimed and
  30   associated VBI streams are also automatically claimed.
  31   Possible error returns: -EBUSY if someone else has claimed
  32   the stream or 0 on success. */
  33int ivtv_claim_stream(struct ivtv_open_id *id, int type)
  34{
  35	struct ivtv *itv = id->itv;
  36	struct ivtv_stream *s = &itv->streams[type];
  37	struct ivtv_stream *s_vbi;
  38	int vbi_type;
  39
  40	if (test_and_set_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
  41		/* someone already claimed this stream */
  42		if (s->id == id) {
  43			/* yes, this file descriptor did. So that's OK. */
  44			return 0;
  45		}
  46		if (s->id == NULL && (type == IVTV_DEC_STREAM_TYPE_VBI ||
  47					 type == IVTV_ENC_STREAM_TYPE_VBI)) {
  48			/* VBI is handled already internally, now also assign
  49			   the file descriptor to this stream for external
  50			   reading of the stream. */
  51			s->id = id;
  52			IVTV_DEBUG_INFO("Start Read VBI\n");
  53			return 0;
  54		}
  55		/* someone else is using this stream already */
  56		IVTV_DEBUG_INFO("Stream %d is busy\n", type);
  57		return -EBUSY;
  58	}
  59	s->id = id;
  60	if (type == IVTV_DEC_STREAM_TYPE_VBI) {
  61		/* Enable reinsertion interrupt */
  62		ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
  63	}
  64
  65	/* IVTV_DEC_STREAM_TYPE_MPG needs to claim IVTV_DEC_STREAM_TYPE_VBI,
  66	   IVTV_ENC_STREAM_TYPE_MPG needs to claim IVTV_ENC_STREAM_TYPE_VBI
  67	   (provided VBI insertion is on and sliced VBI is selected), for all
  68	   other streams we're done */
  69	if (type == IVTV_DEC_STREAM_TYPE_MPG) {
  70		vbi_type = IVTV_DEC_STREAM_TYPE_VBI;
  71	} else if (type == IVTV_ENC_STREAM_TYPE_MPG &&
  72		   itv->vbi.insert_mpeg && !ivtv_raw_vbi(itv)) {
  73		vbi_type = IVTV_ENC_STREAM_TYPE_VBI;
  74	} else {
  75		return 0;
  76	}
  77	s_vbi = &itv->streams[vbi_type];
  78
  79	if (!test_and_set_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags)) {
  80		/* Enable reinsertion interrupt */
  81		if (vbi_type == IVTV_DEC_STREAM_TYPE_VBI)
  82			ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
  83	}
  84	/* mark that it is used internally */
  85	set_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags);
  86	return 0;
  87}
  88EXPORT_SYMBOL(ivtv_claim_stream);
  89
  90/* This function releases a previously claimed stream. It will take into
  91   account associated VBI streams. */
  92void ivtv_release_stream(struct ivtv_stream *s)
  93{
  94	struct ivtv *itv = s->itv;
  95	struct ivtv_stream *s_vbi;
  96
  97	s->id = NULL;
  98	if ((s->type == IVTV_DEC_STREAM_TYPE_VBI || s->type == IVTV_ENC_STREAM_TYPE_VBI) &&
  99		test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
 100		/* this stream is still in use internally */
 101		return;
 102	}
 103	if (!test_and_clear_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
 104		IVTV_DEBUG_WARN("Release stream %s not in use!\n", s->name);
 105		return;
 106	}
 107
 108	ivtv_flush_queues(s);
 109
 110	/* disable reinsertion interrupt */
 111	if (s->type == IVTV_DEC_STREAM_TYPE_VBI)
 112		ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
 113
 114	/* IVTV_DEC_STREAM_TYPE_MPG needs to release IVTV_DEC_STREAM_TYPE_VBI,
 115	   IVTV_ENC_STREAM_TYPE_MPG needs to release IVTV_ENC_STREAM_TYPE_VBI,
 116	   for all other streams we're done */
 117	if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
 118		s_vbi = &itv->streams[IVTV_DEC_STREAM_TYPE_VBI];
 119	else if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
 120		s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
 121	else
 122		return;
 123
 124	/* clear internal use flag */
 125	if (!test_and_clear_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags)) {
 126		/* was already cleared */
 127		return;
 128	}
 129	if (s_vbi->id) {
 130		/* VBI stream still claimed by a file descriptor */
 131		return;
 132	}
 133	/* disable reinsertion interrupt */
 134	if (s_vbi->type == IVTV_DEC_STREAM_TYPE_VBI)
 135		ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
 136	clear_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags);
 137	ivtv_flush_queues(s_vbi);
 138}
 139EXPORT_SYMBOL(ivtv_release_stream);
 140
 141static void ivtv_dualwatch(struct ivtv *itv)
 142{
 143	struct v4l2_tuner vt;
 144	u32 new_stereo_mode;
 145	const u32 dual = 0x02;
 146
 147	new_stereo_mode = v4l2_ctrl_g_ctrl(itv->cxhdl.audio_mode);
 148	memset(&vt, 0, sizeof(vt));
 149	ivtv_call_all(itv, tuner, g_tuner, &vt);
 150	if (vt.audmode == V4L2_TUNER_MODE_LANG1_LANG2 && (vt.rxsubchans & V4L2_TUNER_SUB_LANG2))
 151		new_stereo_mode = dual;
 152
 153	if (new_stereo_mode == itv->dualwatch_stereo_mode)
 154		return;
 155
 156	IVTV_DEBUG_INFO("dualwatch: change stereo flag from 0x%x to 0x%x.\n",
 157			   itv->dualwatch_stereo_mode, new_stereo_mode);
 158	if (v4l2_ctrl_s_ctrl(itv->cxhdl.audio_mode, new_stereo_mode))
 159		IVTV_DEBUG_INFO("dualwatch: changing stereo flag failed\n");
 160}
 161
 162static void ivtv_update_pgm_info(struct ivtv *itv)
 163{
 164	u32 wr_idx = (read_enc(itv->pgm_info_offset) - itv->pgm_info_offset - 4) / 24;
 165	int cnt;
 166	int i = 0;
 167
 168	if (wr_idx >= itv->pgm_info_num) {
 169		IVTV_DEBUG_WARN("Invalid PGM index %d (>= %d)\n", wr_idx, itv->pgm_info_num);
 170		return;
 171	}
 172	cnt = (wr_idx + itv->pgm_info_num - itv->pgm_info_write_idx) % itv->pgm_info_num;
 173	while (i < cnt) {
 174		int idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
 175		struct v4l2_enc_idx_entry *e = itv->pgm_info + idx;
 176		u32 addr = itv->pgm_info_offset + 4 + idx * 24;
 177		const int mapping[8] = { -1, V4L2_ENC_IDX_FRAME_I, V4L2_ENC_IDX_FRAME_P, -1,
 178			V4L2_ENC_IDX_FRAME_B, -1, -1, -1 };
 179					// 1=I, 2=P, 4=B
 180
 181		e->offset = read_enc(addr + 4) + ((u64)read_enc(addr + 8) << 32);
 182		if (e->offset > itv->mpg_data_received) {
 183			break;
 184		}
 185		e->offset += itv->vbi_data_inserted;
 186		e->length = read_enc(addr);
 187		e->pts = read_enc(addr + 16) + ((u64)(read_enc(addr + 20) & 1) << 32);
 188		e->flags = mapping[read_enc(addr + 12) & 7];
 189		i++;
 190	}
 191	itv->pgm_info_write_idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
 192}
 193
 194static void ivtv_schedule(struct ivtv_stream *s)
 195{
 196	struct ivtv *itv = s->itv;
 197	DEFINE_WAIT(wait);
 198
 199	lockdep_assert_held(&itv->serialize_lock);
 200
 201	mutex_unlock(&itv->serialize_lock);
 202	prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
 203	/* New buffers might have become free before we were added to the waitqueue */
 204	if (!s->q_free.buffers)
 205		schedule();
 206	finish_wait(&s->waitq, &wait);
 207	mutex_lock(&itv->serialize_lock);
 208}
 209
 210static struct ivtv_buffer *ivtv_get_buffer(struct ivtv_stream *s, int non_block, int *err)
 211{
 212	struct ivtv *itv = s->itv;
 213	struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
 214	struct ivtv_buffer *buf;
 215
 216	*err = 0;
 217	while (1) {
 218		if (s->type == IVTV_ENC_STREAM_TYPE_MPG) {
 219			/* Process pending program info updates and pending VBI data */
 220			ivtv_update_pgm_info(itv);
 221
 222			if (time_after(jiffies,
 223				       itv->dualwatch_jiffies +
 224				       msecs_to_jiffies(1000))) {
 225				itv->dualwatch_jiffies = jiffies;
 226				ivtv_dualwatch(itv);
 227			}
 228
 229			if (test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
 230			    !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
 231				while ((buf = ivtv_dequeue(s_vbi, &s_vbi->q_full))) {
 232					/* byteswap and process VBI data */
 233					ivtv_process_vbi_data(itv, buf, s_vbi->dma_pts, s_vbi->type);
 234					ivtv_enqueue(s_vbi, buf, &s_vbi->q_free);
 235				}
 236			}
 237			buf = &itv->vbi.sliced_mpeg_buf;
 238			if (buf->readpos != buf->bytesused) {
 239				return buf;
 240			}
 241		}
 242
 243		/* do we have leftover data? */
 244		buf = ivtv_dequeue(s, &s->q_io);
 245		if (buf)
 246			return buf;
 247
 248		/* do we have new data? */
 249		buf = ivtv_dequeue(s, &s->q_full);
 250		if (buf) {
 251			if ((buf->b_flags & IVTV_F_B_NEED_BUF_SWAP) == 0)
 252				return buf;
 253			buf->b_flags &= ~IVTV_F_B_NEED_BUF_SWAP;
 254			if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
 255				/* byteswap MPG data */
 256				ivtv_buf_swap(buf);
 257			else if (s->type != IVTV_DEC_STREAM_TYPE_VBI) {
 258				/* byteswap and process VBI data */
 259				ivtv_process_vbi_data(itv, buf, s->dma_pts, s->type);
 260			}
 261			return buf;
 262		}
 263
 264		/* return if end of stream */
 265		if (s->type != IVTV_DEC_STREAM_TYPE_VBI && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 266			IVTV_DEBUG_INFO("EOS %s\n", s->name);
 267			return NULL;
 268		}
 269
 270		/* return if file was opened with O_NONBLOCK */
 271		if (non_block) {
 272			*err = -EAGAIN;
 273			return NULL;
 274		}
 275
 276		/* wait for more data to arrive */
 277		ivtv_schedule(s);
 278		if (signal_pending(current)) {
 279			/* return if a signal was received */
 280			IVTV_DEBUG_INFO("User stopped %s\n", s->name);
 281			*err = -EINTR;
 282			return NULL;
 283		}
 284	}
 285}
 286
 287static void ivtv_setup_sliced_vbi_buf(struct ivtv *itv)
 288{
 289	int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
 290
 291	itv->vbi.sliced_mpeg_buf.buf = itv->vbi.sliced_mpeg_data[idx];
 292	itv->vbi.sliced_mpeg_buf.bytesused = itv->vbi.sliced_mpeg_size[idx];
 293	itv->vbi.sliced_mpeg_buf.readpos = 0;
 294}
 295
 296static size_t ivtv_copy_buf_to_user(struct ivtv_stream *s, struct ivtv_buffer *buf,
 297		char __user *ubuf, size_t ucount)
 298{
 299	struct ivtv *itv = s->itv;
 300	size_t len = buf->bytesused - buf->readpos;
 301
 302	if (len > ucount) len = ucount;
 303	if (itv->vbi.insert_mpeg && s->type == IVTV_ENC_STREAM_TYPE_MPG &&
 304	    !ivtv_raw_vbi(itv) && buf != &itv->vbi.sliced_mpeg_buf) {
 305		const char *start = buf->buf + buf->readpos;
 306		const char *p = start + 1;
 307		const u8 *q;
 308		u8 ch = itv->search_pack_header ? 0xba : 0xe0;
 309		int stuffing, i;
 310
 311		while (start + len > p && (q = memchr(p, 0, start + len - p))) {
 312			p = q + 1;
 313			if ((char *)q + 15 >= buf->buf + buf->bytesused ||
 314			    q[1] != 0 || q[2] != 1 || q[3] != ch) {
 315				continue;
 316			}
 317			if (!itv->search_pack_header) {
 318				if ((q[6] & 0xc0) != 0x80)
 319					continue;
 320				if (((q[7] & 0xc0) == 0x80 && (q[9] & 0xf0) == 0x20) ||
 321				    ((q[7] & 0xc0) == 0xc0 && (q[9] & 0xf0) == 0x30)) {
 322					ch = 0xba;
 323					itv->search_pack_header = 1;
 324					p = q + 9;
 325				}
 326				continue;
 327			}
 328			stuffing = q[13] & 7;
 329			/* all stuffing bytes must be 0xff */
 330			for (i = 0; i < stuffing; i++)
 331				if (q[14 + i] != 0xff)
 332					break;
 333			if (i == stuffing && (q[4] & 0xc4) == 0x44 && (q[12] & 3) == 3 &&
 334					q[14 + stuffing] == 0 && q[15 + stuffing] == 0 &&
 335					q[16 + stuffing] == 1) {
 336				itv->search_pack_header = 0;
 337				len = (char *)q - start;
 338				ivtv_setup_sliced_vbi_buf(itv);
 339				break;
 340			}
 341		}
 342	}
 343	if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
 344		IVTV_DEBUG_WARN("copy %zd bytes to user failed for %s\n", len, s->name);
 345		return -EFAULT;
 346	}
 347	/*IVTV_INFO("copied %lld %d %d %d %d %d vbi %d\n", itv->mpg_data_received, len, ucount,
 348			buf->readpos, buf->bytesused, buf->bytesused - buf->readpos - len,
 349			buf == &itv->vbi.sliced_mpeg_buf); */
 350	buf->readpos += len;
 351	if (s->type == IVTV_ENC_STREAM_TYPE_MPG && buf != &itv->vbi.sliced_mpeg_buf)
 352		itv->mpg_data_received += len;
 353	return len;
 354}
 355
 356static ssize_t ivtv_read(struct ivtv_stream *s, char __user *ubuf, size_t tot_count, int non_block)
 357{
 358	struct ivtv *itv = s->itv;
 359	size_t tot_written = 0;
 360	int single_frame = 0;
 361
 362	if (atomic_read(&itv->capturing) == 0 && s->id == NULL) {
 363		/* shouldn't happen */
 364		IVTV_DEBUG_WARN("Stream %s not initialized before read\n", s->name);
 365		return -EIO;
 366	}
 367
 368	/* Each VBI buffer is one frame, the v4l2 API says that for VBI the frames should
 369	   arrive one-by-one, so make sure we never output more than one VBI frame at a time */
 370	if (s->type == IVTV_DEC_STREAM_TYPE_VBI ||
 371	    (s->type == IVTV_ENC_STREAM_TYPE_VBI && !ivtv_raw_vbi(itv)))
 372		single_frame = 1;
 373
 374	for (;;) {
 375		struct ivtv_buffer *buf;
 376		int rc;
 377
 378		buf = ivtv_get_buffer(s, non_block, &rc);
 379		/* if there is no data available... */
 380		if (buf == NULL) {
 381			/* if we got data, then return that regardless */
 382			if (tot_written)
 383				break;
 384			/* EOS condition */
 385			if (rc == 0) {
 386				clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
 387				clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 388				ivtv_release_stream(s);
 389			}
 390			/* set errno */
 391			return rc;
 392		}
 393		rc = ivtv_copy_buf_to_user(s, buf, ubuf + tot_written, tot_count - tot_written);
 394		if (buf != &itv->vbi.sliced_mpeg_buf) {
 395			ivtv_enqueue(s, buf, (buf->readpos == buf->bytesused) ? &s->q_free : &s->q_io);
 396		}
 397		else if (buf->readpos == buf->bytesused) {
 398			int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
 399			itv->vbi.sliced_mpeg_size[idx] = 0;
 400			itv->vbi.inserted_frame++;
 401			itv->vbi_data_inserted += buf->bytesused;
 402		}
 403		if (rc < 0)
 404			return rc;
 405		tot_written += rc;
 406
 407		if (tot_written == tot_count || single_frame)
 408			break;
 409	}
 410	return tot_written;
 411}
 412
 413static ssize_t ivtv_read_pos(struct ivtv_stream *s, char __user *ubuf, size_t count,
 414			loff_t *pos, int non_block)
 415{
 416	ssize_t rc = count ? ivtv_read(s, ubuf, count, non_block) : 0;
 417	struct ivtv *itv = s->itv;
 418
 419	IVTV_DEBUG_HI_FILE("read %zd from %s, got %zd\n", count, s->name, rc);
 420	if (rc > 0)
 421		*pos += rc;
 422	return rc;
 423}
 424
 425int ivtv_start_capture(struct ivtv_open_id *id)
 426{
 427	struct ivtv *itv = id->itv;
 428	struct ivtv_stream *s = &itv->streams[id->type];
 429	struct ivtv_stream *s_vbi;
 430
 431	if (s->type == IVTV_ENC_STREAM_TYPE_RAD ||
 432	    s->type == IVTV_DEC_STREAM_TYPE_MPG ||
 433	    s->type == IVTV_DEC_STREAM_TYPE_YUV ||
 434	    s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
 435		/* you cannot read from these stream types. */
 436		return -EINVAL;
 437	}
 438
 439	/* Try to claim this stream. */
 440	if (ivtv_claim_stream(id, s->type))
 441		return -EBUSY;
 442
 443	/* This stream does not need to start capturing */
 444	if (s->type == IVTV_DEC_STREAM_TYPE_VBI) {
 445		set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 446		return 0;
 447	}
 448
 449	/* If capture is already in progress, then we also have to
 450	   do nothing extra. */
 451	if (test_bit(IVTV_F_S_STREAMOFF, &s->s_flags) || test_and_set_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 452		set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 453		return 0;
 454	}
 455
 456	/* Start VBI capture if required */
 457	s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
 458	if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
 459	    test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
 460	    !test_and_set_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
 461		/* Note: the IVTV_ENC_STREAM_TYPE_VBI is claimed
 462		   automatically when the MPG stream is claimed.
 463		   We only need to start the VBI capturing. */
 464		if (ivtv_start_v4l2_encode_stream(s_vbi)) {
 465			IVTV_DEBUG_WARN("VBI capture start failed\n");
 466
 467			/* Failure, clean up and return an error */
 468			clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
 469			clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
 470			/* also releases the associated VBI stream */
 471			ivtv_release_stream(s);
 472			return -EIO;
 473		}
 474		IVTV_DEBUG_INFO("VBI insertion started\n");
 475	}
 476
 477	/* Tell the card to start capturing */
 478	if (!ivtv_start_v4l2_encode_stream(s)) {
 479		/* We're done */
 480		set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 481		/* Resume a possibly paused encoder */
 482		if (test_and_clear_bit(IVTV_F_I_ENC_PAUSED, &itv->i_flags))
 483			ivtv_vapi(itv, CX2341X_ENC_PAUSE_ENCODER, 1, 1);
 484		return 0;
 485	}
 486
 487	/* failure, clean up */
 488	IVTV_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);
 489
 490	/* Note: the IVTV_ENC_STREAM_TYPE_VBI is released
 491	   automatically when the MPG stream is released.
 492	   We only need to stop the VBI capturing. */
 493	if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
 494	    test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
 495		ivtv_stop_v4l2_encode_stream(s_vbi, 0);
 496		clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
 497	}
 498	clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
 499	ivtv_release_stream(s);
 500	return -EIO;
 501}
 502
 503ssize_t ivtv_v4l2_read(struct file * filp, char __user *buf, size_t count, loff_t * pos)
 504{
 505	struct ivtv_open_id *id = file2id(filp);
 506	struct ivtv *itv = id->itv;
 507	struct ivtv_stream *s = &itv->streams[id->type];
 508	ssize_t rc;
 509
 510	IVTV_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);
 511
 512	if (mutex_lock_interruptible(&itv->serialize_lock))
 513		return -ERESTARTSYS;
 514	rc = ivtv_start_capture(id);
 515	if (!rc)
 516		rc = ivtv_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
 517	mutex_unlock(&itv->serialize_lock);
 518	return rc;
 519}
 520
 521int ivtv_start_decoding(struct ivtv_open_id *id, int speed)
 522{
 523	struct ivtv *itv = id->itv;
 524	struct ivtv_stream *s = &itv->streams[id->type];
 525	int rc;
 526
 527	if (atomic_read(&itv->decoding) == 0) {
 528		if (ivtv_claim_stream(id, s->type)) {
 529			/* someone else is using this stream already */
 530			IVTV_DEBUG_WARN("start decode, stream already claimed\n");
 531			return -EBUSY;
 532		}
 533		rc = ivtv_start_v4l2_decode_stream(s, 0);
 534		if (rc < 0) {
 535			if (rc == -EAGAIN)
 536				rc = ivtv_start_v4l2_decode_stream(s, 0);
 537			if (rc < 0)
 538				return rc;
 539		}
 540	}
 541	if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
 542		return ivtv_set_speed(itv, speed);
 543	return 0;
 544}
 545
 546static int ivtv_schedule_dma(struct ivtv_stream *s)
 547{
 548	struct ivtv *itv = s->itv;
 549	int got_sig;
 550	DEFINE_WAIT(wait);
 551
 552	lockdep_assert_held(&itv->serialize_lock);
 553
 554	mutex_unlock(&itv->serialize_lock);
 555	prepare_to_wait(&itv->dma_waitq, &wait, TASK_INTERRUPTIBLE);
 556	while (!(got_sig = signal_pending(current)) &&
 557	       test_bit(IVTV_F_S_DMA_PENDING, &s->s_flags))
 558		schedule();
 559	finish_wait(&itv->dma_waitq, &wait);
 560	mutex_lock(&itv->serialize_lock);
 561
 562	return got_sig;
 563}
 564
 565static ssize_t ivtv_write(struct file *filp, const char __user *user_buf, size_t count, loff_t *pos)
 566{
 567	struct ivtv_open_id *id = file2id(filp);
 568	struct ivtv *itv = id->itv;
 569	struct ivtv_stream *s = &itv->streams[id->type];
 570	struct yuv_playback_info *yi = &itv->yuv_info;
 571	struct ivtv_buffer *buf;
 572	struct ivtv_queue q;
 573	int bytes_written = 0;
 574	int mode;
 575	int rc;
 576
 577	IVTV_DEBUG_HI_FILE("write %zd bytes to %s\n", count, s->name);
 578
 579	if (s->type != IVTV_DEC_STREAM_TYPE_MPG &&
 580	    s->type != IVTV_DEC_STREAM_TYPE_YUV &&
 581	    s->type != IVTV_DEC_STREAM_TYPE_VOUT)
 582		/* not decoder streams */
 583		return -EINVAL;
 584
 585	/* Try to claim this stream */
 586	if (ivtv_claim_stream(id, s->type))
 587		return -EBUSY;
 588
 589	/* This stream does not need to start any decoding */
 590	if (s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
 591		int elems = count / sizeof(struct v4l2_sliced_vbi_data);
 592
 593		set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 594		return ivtv_write_vbi_from_user(itv,
 595		   (const struct v4l2_sliced_vbi_data __user *)user_buf, elems);
 596	}
 597
 598	mode = s->type == IVTV_DEC_STREAM_TYPE_MPG ? OUT_MPG : OUT_YUV;
 599
 600	if (ivtv_set_output_mode(itv, mode) != mode) {
 601	    ivtv_release_stream(s);
 602	    return -EBUSY;
 603	}
 604	ivtv_queue_init(&q);
 605	set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 606
 607	/* Start decoder (returns 0 if already started) */
 608	rc = ivtv_start_decoding(id, itv->speed);
 609	if (rc) {
 610		IVTV_DEBUG_WARN("Failed start decode stream %s\n", s->name);
 611
 612		/* failure, clean up */
 613		clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
 614		clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 615		return rc;
 616	}
 617
 618retry:
 619	/* If possible, just DMA the entire frame - Check the data transfer size
 620	since we may get here before the stream has been fully set-up */
 621	if (mode == OUT_YUV && s->q_full.length == 0 && itv->dma_data_req_size) {
 622		while (count >= itv->dma_data_req_size) {
 623			rc = ivtv_yuv_udma_stream_frame(itv, (void __user *)user_buf);
 624
 625			if (rc < 0)
 626				return rc;
 627
 628			bytes_written += itv->dma_data_req_size;
 629			user_buf += itv->dma_data_req_size;
 630			count -= itv->dma_data_req_size;
 631		}
 632		if (count == 0) {
 633			IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
 634			return bytes_written;
 635		}
 636	}
 637
 638	for (;;) {
 639		/* Gather buffers */
 640		while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_io)))
 641			ivtv_enqueue(s, buf, &q);
 642		while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_free))) {
 643			ivtv_enqueue(s, buf, &q);
 644		}
 645		if (q.buffers)
 646			break;
 647		if (filp->f_flags & O_NONBLOCK)
 648			return -EAGAIN;
 649		ivtv_schedule(s);
 650		if (signal_pending(current)) {
 651			IVTV_DEBUG_INFO("User stopped %s\n", s->name);
 652			return -EINTR;
 653		}
 654	}
 655
 656	/* copy user data into buffers */
 657	while ((buf = ivtv_dequeue(s, &q))) {
 658		/* yuv is a pain. Don't copy more data than needed for a single
 659		   frame, otherwise we lose sync with the incoming stream */
 660		if (s->type == IVTV_DEC_STREAM_TYPE_YUV &&
 661		    yi->stream_size + count > itv->dma_data_req_size)
 662			rc  = ivtv_buf_copy_from_user(s, buf, user_buf,
 663				itv->dma_data_req_size - yi->stream_size);
 664		else
 665			rc = ivtv_buf_copy_from_user(s, buf, user_buf, count);
 666
 667		/* Make sure we really got all the user data */
 668		if (rc < 0) {
 669			ivtv_queue_move(s, &q, NULL, &s->q_free, 0);
 670			return rc;
 671		}
 672		user_buf += rc;
 673		count -= rc;
 674		bytes_written += rc;
 675
 676		if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
 677			yi->stream_size += rc;
 678			/* If we have a complete yuv frame, break loop now */
 679			if (yi->stream_size == itv->dma_data_req_size) {
 680				ivtv_enqueue(s, buf, &s->q_full);
 681				yi->stream_size = 0;
 682				break;
 683			}
 684		}
 685
 686		if (buf->bytesused != s->buf_size) {
 687			/* incomplete, leave in q_io for next time */
 688			ivtv_enqueue(s, buf, &s->q_io);
 689			break;
 690		}
 691		/* Byteswap MPEG buffer */
 692		if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
 693			ivtv_buf_swap(buf);
 694		ivtv_enqueue(s, buf, &s->q_full);
 695	}
 696
 697	if (test_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags)) {
 698		if (s->q_full.length >= itv->dma_data_req_size) {
 699			if (mode == OUT_YUV)
 700				ivtv_yuv_setup_stream_frame(itv);
 701
 702			if (ivtv_schedule_dma(s)) {
 703				IVTV_DEBUG_INFO("User interrupted %s\n", s->name);
 704				return -EINTR;
 705			}
 706
 707			clear_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags);
 708			ivtv_queue_move(s, &s->q_full, NULL, &s->q_predma, itv->dma_data_req_size);
 709			ivtv_dma_stream_dec_prepare(s, itv->dma_data_req_offset + IVTV_DECODER_OFFSET, 1);
 710		}
 711	}
 712	/* more user data is available, wait until buffers become free
 713	   to transfer the rest. */
 714	if (count && !(filp->f_flags & O_NONBLOCK))
 715		goto retry;
 716	IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
 717	return bytes_written;
 718}
 719
 720ssize_t ivtv_v4l2_write(struct file *filp, const char __user *user_buf, size_t count, loff_t *pos)
 721{
 722	struct ivtv_open_id *id = file2id(filp);
 723	struct ivtv *itv = id->itv;
 724	ssize_t res;
 725
 726	if (mutex_lock_interruptible(&itv->serialize_lock))
 727		return -ERESTARTSYS;
 728	res = ivtv_write(filp, user_buf, count, pos);
 729	mutex_unlock(&itv->serialize_lock);
 730	return res;
 731}
 732
 733__poll_t ivtv_v4l2_dec_poll(struct file *filp, poll_table *wait)
 734{
 735	struct ivtv_open_id *id = file2id(filp);
 736	struct ivtv *itv = id->itv;
 737	struct ivtv_stream *s = &itv->streams[id->type];
 738	__poll_t res = 0;
 739
 740	/* add stream's waitq to the poll list */
 741	IVTV_DEBUG_HI_FILE("Decoder poll\n");
 742
 743	/* If there are subscribed events, then only use the new event
 744	   API instead of the old video.h based API. */
 745	if (!list_empty(&id->fh.subscribed)) {
 746		poll_wait(filp, &id->fh.wait, wait);
 747		/* Turn off the old-style vsync events */
 748		clear_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags);
 749		if (v4l2_event_pending(&id->fh))
 750			res = EPOLLPRI;
 751	} else {
 752		/* This is the old-style API which is here only for backwards
 753		   compatibility. */
 754		poll_wait(filp, &s->waitq, wait);
 755		set_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags);
 756		if (test_bit(IVTV_F_I_EV_VSYNC, &itv->i_flags) ||
 757		    test_bit(IVTV_F_I_EV_DEC_STOPPED, &itv->i_flags))
 758			res = EPOLLPRI;
 759	}
 760
 761	/* Allow write if buffers are available for writing */
 762	if (s->q_free.buffers)
 763		res |= EPOLLOUT | EPOLLWRNORM;
 764	return res;
 765}
 766
 767__poll_t ivtv_v4l2_enc_poll(struct file *filp, poll_table *wait)
 768{
 769	__poll_t req_events = poll_requested_events(wait);
 770	struct ivtv_open_id *id = file2id(filp);
 771	struct ivtv *itv = id->itv;
 772	struct ivtv_stream *s = &itv->streams[id->type];
 773	int eof = test_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
 774	__poll_t res = 0;
 775
 776	/* Start a capture if there is none */
 777	if (!eof && !test_bit(IVTV_F_S_STREAMING, &s->s_flags) &&
 778			s->type != IVTV_ENC_STREAM_TYPE_RAD &&
 779			(req_events & (EPOLLIN | EPOLLRDNORM))) {
 780		int rc;
 781
 782		mutex_lock(&itv->serialize_lock);
 783		rc = ivtv_start_capture(id);
 784		mutex_unlock(&itv->serialize_lock);
 785		if (rc) {
 786			IVTV_DEBUG_INFO("Could not start capture for %s (%d)\n",
 787					s->name, rc);
 788			return EPOLLERR;
 789		}
 790		IVTV_DEBUG_FILE("Encoder poll started capture\n");
 791	}
 792
 793	/* add stream's waitq to the poll list */
 794	IVTV_DEBUG_HI_FILE("Encoder poll\n");
 795	poll_wait(filp, &s->waitq, wait);
 796	if (v4l2_event_pending(&id->fh))
 797		res |= EPOLLPRI;
 798	else
 799		poll_wait(filp, &id->fh.wait, wait);
 800
 801	if (s->q_full.length || s->q_io.length)
 802		return res | EPOLLIN | EPOLLRDNORM;
 803	if (eof)
 804		return res | EPOLLHUP;
 805	return res;
 806}
 807
 808void ivtv_stop_capture(struct ivtv_open_id *id, int gop_end)
 809{
 810	struct ivtv *itv = id->itv;
 811	struct ivtv_stream *s = &itv->streams[id->type];
 812
 813	IVTV_DEBUG_FILE("close() of %s\n", s->name);
 814
 815	/* 'Unclaim' this stream */
 816
 817	/* Stop capturing */
 818	if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 819		struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
 820
 821		IVTV_DEBUG_INFO("close stopping capture\n");
 822		/* Special case: a running VBI capture for VBI insertion
 823		   in the mpeg stream. Need to stop that too. */
 824		if (id->type == IVTV_ENC_STREAM_TYPE_MPG &&
 825		    test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags) &&
 826		    !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
 827			IVTV_DEBUG_INFO("close stopping embedded VBI capture\n");
 828			ivtv_stop_v4l2_encode_stream(s_vbi, 0);
 829		}
 830		if ((id->type == IVTV_DEC_STREAM_TYPE_VBI ||
 831		     id->type == IVTV_ENC_STREAM_TYPE_VBI) &&
 832		    test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
 833			/* Also used internally, don't stop capturing */
 834			s->id = NULL;
 835		}
 836		else {
 837			ivtv_stop_v4l2_encode_stream(s, gop_end);
 838		}
 839	}
 840	if (!gop_end) {
 841		clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 842		clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
 843		ivtv_release_stream(s);
 844	}
 845}
 846
 847static void ivtv_stop_decoding(struct ivtv_open_id *id, int flags, u64 pts)
 848{
 849	struct ivtv *itv = id->itv;
 850	struct ivtv_stream *s = &itv->streams[id->type];
 851
 852	IVTV_DEBUG_FILE("close() of %s\n", s->name);
 853
 854	if (id->type == IVTV_DEC_STREAM_TYPE_YUV &&
 855		test_bit(IVTV_F_I_DECODING_YUV, &itv->i_flags)) {
 856		/* Restore registers we've changed & clean up any mess */
 857		ivtv_yuv_close(itv);
 858	}
 859
 860	/* Stop decoding */
 861	if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 862		IVTV_DEBUG_INFO("close stopping decode\n");
 863
 864		ivtv_stop_v4l2_decode_stream(s, flags, pts);
 865		itv->output_mode = OUT_NONE;
 866	}
 867	clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 868	clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
 869
 870	if (itv->output_mode == OUT_UDMA_YUV && id->yuv_frames)
 871		itv->output_mode = OUT_NONE;
 872
 873	itv->speed = 0;
 874	clear_bit(IVTV_F_I_DEC_PAUSED, &itv->i_flags);
 875	ivtv_release_stream(s);
 876}
 877
 878int ivtv_v4l2_close(struct file *filp)
 879{
 880	struct v4l2_fh *fh = file_to_v4l2_fh(filp);
 881	struct ivtv_open_id *id = file2id(filp);
 882	struct ivtv *itv = id->itv;
 883	struct ivtv_stream *s = &itv->streams[id->type];
 884
 885	IVTV_DEBUG_FILE("close %s\n", s->name);
 886
 887	mutex_lock(&itv->serialize_lock);
 888
 889	/* Stop radio */
 890	if (id->type == IVTV_ENC_STREAM_TYPE_RAD &&
 891			v4l2_fh_is_singular_file(filp)) {
 892		/* Closing radio device, return to TV mode */
 893		ivtv_mute(itv);
 894		/* Mark that the radio is no longer in use */
 895		clear_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
 896		/* Switch tuner to TV */
 897		ivtv_call_all(itv, video, s_std, itv->std);
 898		/* Select correct audio input (i.e. TV tuner or Line in) */
 899		ivtv_audio_set_io(itv);
 900		if (itv->hw_flags & IVTV_HW_SAA711X) {
 901			ivtv_call_hw(itv, IVTV_HW_SAA711X, video, s_crystal_freq,
 902					SAA7115_FREQ_32_11_MHZ, 0);
 903		}
 904		if (atomic_read(&itv->capturing) > 0) {
 905			/* Undo video mute */
 906			ivtv_vapi(itv, CX2341X_ENC_MUTE_VIDEO, 1,
 907					v4l2_ctrl_g_ctrl(itv->cxhdl.video_mute) |
 908					(v4l2_ctrl_g_ctrl(itv->cxhdl.video_mute_yuv) << 8));
 909		}
 910		/* Done! Unmute and continue. */
 911		ivtv_unmute(itv);
 912	}
 913
 914	v4l2_fh_del(fh, filp);
 915	v4l2_fh_exit(fh);
 916
 917	/* Easy case first: this stream was never claimed by us */
 918	if (s->id != id)
 919		goto close_done;
 920
 921	/* 'Unclaim' this stream */
 922
 923	if (s->type >= IVTV_DEC_STREAM_TYPE_MPG) {
 924		struct ivtv_stream *s_vout = &itv->streams[IVTV_DEC_STREAM_TYPE_VOUT];
 925
 926		ivtv_stop_decoding(id, V4L2_DEC_CMD_STOP_TO_BLACK | V4L2_DEC_CMD_STOP_IMMEDIATELY, 0);
 927
 928		/* If all output streams are closed, and if the user doesn't have
 929		   IVTV_DEC_STREAM_TYPE_VOUT open, then disable CC on TV-out. */
 930		if (itv->output_mode == OUT_NONE && !test_bit(IVTV_F_S_APPL_IO, &s_vout->s_flags)) {
 931			/* disable CC on TV-out */
 932			ivtv_disable_cc(itv);
 933		}
 934	} else {
 935		ivtv_stop_capture(id, 0);
 936	}
 937close_done:
 938	kfree(id);
 939	mutex_unlock(&itv->serialize_lock);
 940	return 0;
 941}
 942
 943static int ivtv_open(struct file *filp)
 944{
 945	struct video_device *vdev = video_devdata(filp);
 946	struct ivtv_stream *s = video_get_drvdata(vdev);
 947	struct ivtv *itv = s->itv;
 948	struct ivtv_open_id *item;
 949	int res = 0;
 950
 951	IVTV_DEBUG_FILE("open %s\n", s->name);
 952
 953	if (ivtv_init_on_first_open(itv)) {
 954		IVTV_ERR("Failed to initialize on device %s\n",
 955			 video_device_node_name(vdev));
 956		return -ENXIO;
 957	}
 958
 959#ifdef CONFIG_VIDEO_ADV_DEBUG
 960	/* Unless ivtv_fw_debug is set, error out if firmware dead. */
 961	if (ivtv_fw_debug) {
 962		IVTV_WARN("Opening %s with dead firmware lockout disabled\n",
 963			  video_device_node_name(vdev));
 964		IVTV_WARN("Selected firmware errors will be ignored\n");
 965	} else {
 966#else
 967	if (1) {
 968#endif
 969		res = ivtv_firmware_check(itv, "ivtv_serialized_open");
 970		if (res == -EAGAIN)
 971			res = ivtv_firmware_check(itv, "ivtv_serialized_open");
 972		if (res < 0)
 973			return -EIO;
 974	}
 975
 976	if (s->type == IVTV_DEC_STREAM_TYPE_MPG &&
 977		test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_YUV].s_flags))
 978		return -EBUSY;
 979
 980	if (s->type == IVTV_DEC_STREAM_TYPE_YUV &&
 981		test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_MPG].s_flags))
 982		return -EBUSY;
 983
 984	if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
 985		if (read_reg(0x82c) == 0) {
 986			IVTV_ERR("Tried to open YUV output device but need to send data to mpeg decoder before it can be used\n");
 987			/* return -ENODEV; */
 988		}
 989		ivtv_udma_alloc(itv);
 990	}
 991
 992	/* Allocate memory */
 993	item = kzalloc(sizeof(struct ivtv_open_id), GFP_KERNEL);
 994	if (NULL == item) {
 995		IVTV_DEBUG_WARN("nomem on v4l2 open\n");
 996		return -ENOMEM;
 997	}
 998	v4l2_fh_init(&item->fh, &s->vdev);
 999	item->itv = itv;
1000	item->type = s->type;
1001	v4l2_fh_add(&item->fh, filp);
1002
1003	if (item->type == IVTV_ENC_STREAM_TYPE_RAD &&
1004			v4l2_fh_is_singular_file(filp)) {
1005		if (!test_bit(IVTV_F_I_RADIO_USER, &itv->i_flags)) {
1006			if (atomic_read(&itv->capturing) > 0) {
1007				/* switching to radio while capture is
1008				   in progress is not polite */
1009				v4l2_fh_del(&item->fh, filp);
1010				v4l2_fh_exit(&item->fh);
1011				kfree(item);
1012				return -EBUSY;
1013			}
1014		}
1015		/* Mark that the radio is being used. */
1016		set_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
1017		/* We have the radio */
1018		ivtv_mute(itv);
1019		/* Switch tuner to radio */
1020		ivtv_call_all(itv, tuner, s_radio);
1021		/* Select the correct audio input (i.e. radio tuner) */
1022		ivtv_audio_set_io(itv);
1023		if (itv->hw_flags & IVTV_HW_SAA711X) {
1024			ivtv_call_hw(itv, IVTV_HW_SAA711X, video, s_crystal_freq,
1025				SAA7115_FREQ_32_11_MHZ, SAA7115_FREQ_FL_APLL);
1026		}
1027		/* Done! Unmute and continue. */
1028		ivtv_unmute(itv);
1029	}
1030
1031	/* YUV or MPG Decoding Mode? */
1032	if (s->type == IVTV_DEC_STREAM_TYPE_MPG) {
1033		clear_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
1034	} else if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
1035		set_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
1036		/* For yuv, we need to know the dma size before we start */
1037		itv->dma_data_req_size =
1038				1080 * ((itv->yuv_info.v4l2_src_h + 31) & ~31);
1039		itv->yuv_info.stream_size = 0;
1040	}
1041	return 0;
1042}
1043
1044int ivtv_v4l2_open(struct file *filp)
1045{
1046	struct video_device *vdev = video_devdata(filp);
1047	int res;
1048
1049	if (mutex_lock_interruptible(vdev->lock))
1050		return -ERESTARTSYS;
1051	res = ivtv_open(filp);
1052	mutex_unlock(vdev->lock);
1053	return res;
1054}
1055
1056void ivtv_mute(struct ivtv *itv)
1057{
1058	if (atomic_read(&itv->capturing))
1059		ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 1);
1060	IVTV_DEBUG_INFO("Mute\n");
1061}
1062
1063void ivtv_unmute(struct ivtv *itv)
1064{
1065	if (atomic_read(&itv->capturing)) {
1066		ivtv_msleep_timeout(100, 0);
1067		ivtv_vapi(itv, CX2341X_ENC_MISC, 1, 12);
1068		ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 0);
1069	}
1070	IVTV_DEBUG_INFO("Unmute\n");
1071}