1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  *   SAA713x ALSA support for V4L
4  */
5 
6 #include "saa7134.h"
7 #include "saa7134-reg.h"
8 
9 #include <linux/init.h>
10 #include <linux/slab.h>
11 #include <linux/time.h>
12 #include <linux/wait.h>
13 #include <linux/module.h>
14 #include <sound/core.h>
15 #include <sound/control.h>
16 #include <sound/pcm.h>
17 #include <sound/pcm_params.h>
18 #include <sound/initval.h>
19 #include <linux/interrupt.h>
20 #include <linux/vmalloc.h>
21 
22 /*
23  * Configuration macros
24  */
25 
26 /* defaults */
27 #define MIXER_ADDR_UNSELECTED	-1
28 #define MIXER_ADDR_TVTUNER	0
29 #define MIXER_ADDR_LINE1	1
30 #define MIXER_ADDR_LINE2	2
31 #define MIXER_ADDR_LAST		2
32 
33 
34 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;	/* Index 0-MAX */
35 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;	/* ID for this card */
36 static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 1};
37 
38 module_param_array(index, int, NULL, 0444);
39 module_param_array(enable, int, NULL, 0444);
40 MODULE_PARM_DESC(index, "Index value for SAA7134 capture interface(s).");
41 MODULE_PARM_DESC(enable, "Enable (or not) the SAA7134 capture interface(s).");
42 
43 /*
44  * Main chip structure
45  */
46 
47 typedef struct snd_card_saa7134 {
48 	struct snd_card *card;
49 	spinlock_t mixer_lock;
50 	int mixer_volume[MIXER_ADDR_LAST+1][2];
51 	int capture_source_addr;
52 	int capture_source[2];
53 	struct snd_kcontrol *capture_ctl[MIXER_ADDR_LAST+1];
54 	struct pci_dev *pci;
55 	struct saa7134_dev *dev;
56 
57 	unsigned long iobase;
58 	s16 irq;
59 	u16 mute_was_on;
60 
61 	spinlock_t lock;
62 } snd_card_saa7134_t;
63 
64 
65 /*
66  * PCM structure
67  */
68 
69 typedef struct snd_card_saa7134_pcm {
70 	struct saa7134_dev *dev;
71 
72 	spinlock_t lock;
73 
74 	struct snd_pcm_substream *substream;
75 } snd_card_saa7134_pcm_t;
76 
77 static struct snd_card *snd_saa7134_cards[SNDRV_CARDS];
78 
79 
80 /*
81  * saa7134 DMA audio stop
82  *
83  *   Called when the capture device is released or the buffer overflows
84  *
85  *   - Copied verbatim from saa7134-oss's dsp_dma_stop.
86  *
87  */
88 
89 static void saa7134_dma_stop(struct saa7134_dev *dev)
90 {
91 	dev->dmasound.dma_blk     = -1;
92 	dev->dmasound.dma_running = 0;
93 	saa7134_set_dmabits(dev);
94 }
95 
96 /*
97  * saa7134 DMA audio start
98  *
99  *   Called when preparing the capture device for use
100  *
101  *   - Copied verbatim from saa7134-oss's dsp_dma_start.
102  *
103  */
104 
105 static void saa7134_dma_start(struct saa7134_dev *dev)
106 {
107 	dev->dmasound.dma_blk     = 0;
108 	dev->dmasound.dma_running = 1;
109 	saa7134_set_dmabits(dev);
110 }
111 
112 /*
113  * saa7134 audio DMA IRQ handler
114  *
115  *   Called whenever we get an SAA7134_IRQ_REPORT_DONE_RA3 interrupt
116  *   Handles shifting between the 2 buffers, manages the read counters,
117  *  and notifies ALSA when periods elapse
118  *
119  *   - Mostly copied from saa7134-oss's saa7134_irq_oss_done.
120  *
121  */
122 
123 static void saa7134_irq_alsa_done(struct saa7134_dev *dev,
124 				  unsigned long status)
125 {
126 	int next_blk, reg = 0;
127 
128 	spin_lock(&dev->slock);
129 	if (UNSET == dev->dmasound.dma_blk) {
130 		pr_debug("irq: recording stopped\n");
131 		goto done;
132 	}
133 	if (0 != (status & 0x0f000000))
134 		pr_debug("irq: lost %ld\n", (status >> 24) & 0x0f);
135 	if (0 == (status & 0x10000000)) {
136 		/* odd */
137 		if (0 == (dev->dmasound.dma_blk & 0x01))
138 			reg = SAA7134_RS_BA1(6);
139 	} else {
140 		/* even */
141 		if (1 == (dev->dmasound.dma_blk & 0x01))
142 			reg = SAA7134_RS_BA2(6);
143 	}
144 	if (0 == reg) {
145 		pr_debug("irq: field oops [%s]\n",
146 			(status & 0x10000000) ? "even" : "odd");
147 		goto done;
148 	}
149 
150 	if (dev->dmasound.read_count >= dev->dmasound.blksize * (dev->dmasound.blocks-2)) {
151 		pr_debug("irq: overrun [full=%d/%d] - Blocks in %d\n",
152 			dev->dmasound.read_count,
153 			dev->dmasound.bufsize, dev->dmasound.blocks);
154 		spin_unlock(&dev->slock);
155 		snd_pcm_stop_xrun(dev->dmasound.substream);
156 		return;
157 	}
158 
159 	/* next block addr */
160 	next_blk = (dev->dmasound.dma_blk + 2) % dev->dmasound.blocks;
161 	saa_writel(reg,next_blk * dev->dmasound.blksize);
162 	pr_debug("irq: ok, %s, next_blk=%d, addr=%x, blocks=%u, size=%u, read=%u\n",
163 		(status & 0x10000000) ? "even" : "odd ", next_blk,
164 		 next_blk * dev->dmasound.blksize, dev->dmasound.blocks,
165 		 dev->dmasound.blksize, dev->dmasound.read_count);
166 
167 	/* update status & wake waiting readers */
168 	dev->dmasound.dma_blk = (dev->dmasound.dma_blk + 1) % dev->dmasound.blocks;
169 	dev->dmasound.read_count += dev->dmasound.blksize;
170 
171 	dev->dmasound.recording_on = reg;
172 
173 	if (dev->dmasound.read_count >= snd_pcm_lib_period_bytes(dev->dmasound.substream)) {
174 		spin_unlock(&dev->slock);
175 		snd_pcm_period_elapsed(dev->dmasound.substream);
176 		spin_lock(&dev->slock);
177 	}
178 
179  done:
180 	spin_unlock(&dev->slock);
181 
182 }
183 
184 /*
185  * IRQ request handler
186  *
187  *   Runs along with saa7134's IRQ handler, discards anything that isn't
188  *   DMA sound
189  *
190  */
191 
192 static irqreturn_t saa7134_alsa_irq(int irq, void *dev_id)
193 {
194 	struct saa7134_dmasound *dmasound = dev_id;
195 	struct saa7134_dev *dev = dmasound->priv_data;
196 
197 	unsigned long report, status;
198 	int loop, handled = 0;
199 
200 	for (loop = 0; loop < 10; loop++) {
201 		report = saa_readl(SAA7134_IRQ_REPORT);
202 		status = saa_readl(SAA7134_IRQ_STATUS);
203 
204 		if (report & SAA7134_IRQ_REPORT_DONE_RA3) {
205 			handled = 1;
206 			saa_writel(SAA7134_IRQ_REPORT,
207 				   SAA7134_IRQ_REPORT_DONE_RA3);
208 			saa7134_irq_alsa_done(dev, status);
209 		} else {
210 			goto out;
211 		}
212 	}
213 
214 	if (loop == 10) {
215 		pr_debug("error! looping IRQ!");
216 	}
217 
218 out:
219 	return IRQ_RETVAL(handled);
220 }
221 
222 /*
223  * ALSA capture trigger
224  *
225  *   - One of the ALSA capture callbacks.
226  *
227  *   Called whenever a capture is started or stopped. Must be defined,
228  *   but there's nothing we want to do here
229  *
230  */
231 
232 static int snd_card_saa7134_capture_trigger(struct snd_pcm_substream * substream,
233 					  int cmd)
234 {
235 	struct snd_pcm_runtime *runtime = substream->runtime;
236 	snd_card_saa7134_pcm_t *pcm = runtime->private_data;
237 	struct saa7134_dev *dev=pcm->dev;
238 	int err = 0;
239 
240 	spin_lock(&dev->slock);
241 	if (cmd == SNDRV_PCM_TRIGGER_START) {
242 		/* start dma */
243 		saa7134_dma_start(dev);
244 	} else if (cmd == SNDRV_PCM_TRIGGER_STOP) {
245 		/* stop dma */
246 		saa7134_dma_stop(dev);
247 	} else {
248 		err = -EINVAL;
249 	}
250 	spin_unlock(&dev->slock);
251 
252 	return err;
253 }
254 
255 static int saa7134_alsa_dma_init(struct saa7134_dev *dev,
256 				 unsigned long nr_pages)
257 {
258 	struct saa7134_dmasound *dma = &dev->dmasound;
259 	struct page *pg;
260 	int i;
261 
262 	dma->vaddr = vmalloc_32(nr_pages << PAGE_SHIFT);
263 	if (NULL == dma->vaddr) {
264 		pr_debug("vmalloc_32(%lu pages) failed\n", nr_pages);
265 		return -ENOMEM;
266 	}
267 
268 	pr_debug("vmalloc is at addr %p, size=%lu\n",
269 		 dma->vaddr, nr_pages << PAGE_SHIFT);
270 
271 	memset(dma->vaddr, 0, nr_pages << PAGE_SHIFT);
272 	dma->nr_pages = nr_pages;
273 
274 	dma->sglist = vzalloc(array_size(sizeof(*dma->sglist), dma->nr_pages));
275 	if (NULL == dma->sglist)
276 		goto vzalloc_err;
277 
278 	sg_init_table(dma->sglist, dma->nr_pages);
279 	for (i = 0; i < dma->nr_pages; i++) {
280 		pg = vmalloc_to_page(dma->vaddr + i * PAGE_SIZE);
281 		if (NULL == pg)
282 			goto vmalloc_to_page_err;
283 		sg_set_page(&dma->sglist[i], pg, PAGE_SIZE, 0);
284 	}
285 	return 0;
286 
287 vmalloc_to_page_err:
288 	vfree(dma->sglist);
289 	dma->sglist = NULL;
290 vzalloc_err:
291 	vfree(dma->vaddr);
292 	dma->vaddr = NULL;
293 	return -ENOMEM;
294 }
295 
296 static int saa7134_alsa_dma_map(struct saa7134_dev *dev)
297 {
298 	struct saa7134_dmasound *dma = &dev->dmasound;
299 
300 	dma->sglen = dma_map_sg(&dev->pci->dev, dma->sglist,
301 			dma->nr_pages, DMA_FROM_DEVICE);
302 
303 	if (0 == dma->sglen) {
304 		pr_warn("%s: saa7134_alsa_map_sg failed\n", __func__);
305 		return -ENOMEM;
306 	}
307 	return 0;
308 }
309 
310 static int saa7134_alsa_dma_unmap(struct saa7134_dev *dev)
311 {
312 	struct saa7134_dmasound *dma = &dev->dmasound;
313 
314 	if (!dma->sglen)
315 		return 0;
316 
317 	dma_unmap_sg(&dev->pci->dev, dma->sglist, dma->nr_pages, DMA_FROM_DEVICE);
318 	dma->sglen = 0;
319 	return 0;
320 }
321 
322 static int saa7134_alsa_dma_free(struct saa7134_dmasound *dma)
323 {
324 	vfree(dma->sglist);
325 	dma->sglist = NULL;
326 	vfree(dma->vaddr);
327 	dma->vaddr = NULL;
328 	return 0;
329 }
330 
331 /*
332  * DMA buffer initialization
333  *
334  *   Uses V4L functions to initialize the DMA. Shouldn't be necessary in
335  *  ALSA, but I was unable to use ALSA's own DMA, and had to force the
336  *  usage of V4L's
337  *
338  *   - Copied verbatim from saa7134-oss.
339  *
340  */
341 
342 static int dsp_buffer_init(struct saa7134_dev *dev)
343 {
344 	int err;
345 
346 	BUG_ON(!dev->dmasound.bufsize);
347 
348 	err = saa7134_alsa_dma_init(dev,
349 			       (dev->dmasound.bufsize + PAGE_SIZE) >> PAGE_SHIFT);
350 	if (0 != err)
351 		return err;
352 	return 0;
353 }
354 
355 /*
356  * DMA buffer release
357  *
358  *   Called after closing the device, during snd_card_saa7134_capture_close
359  *
360  */
361 
362 static int dsp_buffer_free(struct saa7134_dev *dev)
363 {
364 	BUG_ON(!dev->dmasound.blksize);
365 
366 	saa7134_alsa_dma_free(&dev->dmasound);
367 
368 	dev->dmasound.blocks  = 0;
369 	dev->dmasound.blksize = 0;
370 	dev->dmasound.bufsize = 0;
371 
372 	return 0;
373 }
374 
375 /*
376  * Setting the capture source and updating the ALSA controls
377  */
378 static int snd_saa7134_capsrc_set(struct snd_kcontrol *kcontrol,
379 				  int left, int right, bool force_notify)
380 {
381 	snd_card_saa7134_t *chip = snd_kcontrol_chip(kcontrol);
382 	int change = 0, addr = kcontrol->private_value;
383 	int active, old_addr;
384 	u32 anabar, xbarin;
385 	int analog_io, rate;
386 	struct saa7134_dev *dev;
387 
388 	dev = chip->dev;
389 
390 	spin_lock_irq(&chip->mixer_lock);
391 
392 	active = left != 0 || right != 0;
393 	old_addr = chip->capture_source_addr;
394 
395 	/* The active capture source cannot be deactivated */
396 	if (active) {
397 		change = old_addr != addr ||
398 			 chip->capture_source[0] != left ||
399 			 chip->capture_source[1] != right;
400 
401 		chip->capture_source[0] = left;
402 		chip->capture_source[1] = right;
403 		chip->capture_source_addr = addr;
404 		dev->dmasound.input = addr;
405 	}
406 	spin_unlock_irq(&chip->mixer_lock);
407 
408 	if (change) {
409 		switch (dev->pci->device) {
410 
411 		case PCI_DEVICE_ID_PHILIPS_SAA7134:
412 			switch (addr) {
413 			case MIXER_ADDR_TVTUNER:
414 				saa_andorb(SAA7134_AUDIO_FORMAT_CTRL,
415 					   0xc0, 0xc0);
416 				saa_andorb(SAA7134_SIF_SAMPLE_FREQ,
417 					   0x03, 0x00);
418 				break;
419 			case MIXER_ADDR_LINE1:
420 			case MIXER_ADDR_LINE2:
421 				analog_io = (MIXER_ADDR_LINE1 == addr) ?
422 					     0x00 : 0x08;
423 				rate = (32000 == dev->dmasound.rate) ?
424 					0x01 : 0x03;
425 				saa_andorb(SAA7134_ANALOG_IO_SELECT,
426 					   0x08, analog_io);
427 				saa_andorb(SAA7134_AUDIO_FORMAT_CTRL,
428 					   0xc0, 0x80);
429 				saa_andorb(SAA7134_SIF_SAMPLE_FREQ,
430 					   0x03, rate);
431 				break;
432 			}
433 
434 			break;
435 		case PCI_DEVICE_ID_PHILIPS_SAA7133:
436 		case PCI_DEVICE_ID_PHILIPS_SAA7135:
437 			xbarin = 0x03; /* adc */
438 			anabar = 0;
439 			switch (addr) {
440 			case MIXER_ADDR_TVTUNER:
441 				xbarin = 0; /* Demodulator */
442 				anabar = 2; /* DACs */
443 				break;
444 			case MIXER_ADDR_LINE1:
445 				anabar = 0;  /* aux1, aux1 */
446 				break;
447 			case MIXER_ADDR_LINE2:
448 				anabar = 9;  /* aux2, aux2 */
449 				break;
450 			}
451 
452 			/* output xbar always main channel */
453 			saa_dsp_writel(dev, SAA7133_DIGITAL_OUTPUT_SEL1,
454 				       0xbbbb10);
455 
456 			if (left || right) {
457 				/* We've got data, turn the input on */
458 				saa_dsp_writel(dev, SAA7133_DIGITAL_INPUT_XBAR1,
459 					       xbarin);
460 				saa_writel(SAA7133_ANALOG_IO_SELECT, anabar);
461 			} else {
462 				saa_dsp_writel(dev, SAA7133_DIGITAL_INPUT_XBAR1,
463 					       0);
464 				saa_writel(SAA7133_ANALOG_IO_SELECT, 0);
465 			}
466 			break;
467 		}
468 	}
469 
470 	if (change) {
471 		if (force_notify)
472 			snd_ctl_notify(chip->card,
473 				       SNDRV_CTL_EVENT_MASK_VALUE,
474 				       &chip->capture_ctl[addr]->id);
475 
476 		if (old_addr != MIXER_ADDR_UNSELECTED && old_addr != addr)
477 			snd_ctl_notify(chip->card,
478 				       SNDRV_CTL_EVENT_MASK_VALUE,
479 				       &chip->capture_ctl[old_addr]->id);
480 	}
481 
482 	return change;
483 }
484 
485 /*
486  * ALSA PCM preparation
487  *
488  *   - One of the ALSA capture callbacks.
489  *
490  *   Called right after the capture device is opened, this function configures
491  *  the buffer using the previously defined functions, allocates the memory,
492  *  sets up the hardware registers, and then starts the DMA. When this function
493  *  returns, the audio should be flowing.
494  *
495  */
496 
497 static int snd_card_saa7134_capture_prepare(struct snd_pcm_substream * substream)
498 {
499 	struct snd_pcm_runtime *runtime = substream->runtime;
500 	int bswap, sign;
501 	u32 fmt, control;
502 	snd_card_saa7134_t *saa7134 = snd_pcm_substream_chip(substream);
503 	struct saa7134_dev *dev;
504 	snd_card_saa7134_pcm_t *pcm = runtime->private_data;
505 
506 	pcm->dev->dmasound.substream = substream;
507 
508 	dev = saa7134->dev;
509 
510 	if (snd_pcm_format_width(runtime->format) == 8)
511 		fmt = 0x00;
512 	else
513 		fmt = 0x01;
514 
515 	if (snd_pcm_format_signed(runtime->format))
516 		sign = 1;
517 	else
518 		sign = 0;
519 
520 	if (snd_pcm_format_big_endian(runtime->format))
521 		bswap = 1;
522 	else
523 		bswap = 0;
524 
525 	switch (dev->pci->device) {
526 	  case PCI_DEVICE_ID_PHILIPS_SAA7134:
527 		if (1 == runtime->channels)
528 			fmt |= (1 << 3);
529 		if (2 == runtime->channels)
530 			fmt |= (3 << 3);
531 		if (sign)
532 			fmt |= 0x04;
533 
534 		fmt |= (MIXER_ADDR_TVTUNER == dev->dmasound.input) ? 0xc0 : 0x80;
535 		saa_writeb(SAA7134_NUM_SAMPLES0, ((dev->dmasound.blksize - 1) & 0x0000ff));
536 		saa_writeb(SAA7134_NUM_SAMPLES1, ((dev->dmasound.blksize - 1) & 0x00ff00) >>  8);
537 		saa_writeb(SAA7134_NUM_SAMPLES2, ((dev->dmasound.blksize - 1) & 0xff0000) >> 16);
538 		saa_writeb(SAA7134_AUDIO_FORMAT_CTRL, fmt);
539 
540 		break;
541 	  case PCI_DEVICE_ID_PHILIPS_SAA7133:
542 	  case PCI_DEVICE_ID_PHILIPS_SAA7135:
543 		if (1 == runtime->channels)
544 			fmt |= (1 << 4);
545 		if (2 == runtime->channels)
546 			fmt |= (2 << 4);
547 		if (!sign)
548 			fmt |= 0x04;
549 		saa_writel(SAA7133_NUM_SAMPLES, dev->dmasound.blksize -1);
550 		saa_writel(SAA7133_AUDIO_CHANNEL, 0x543210 | (fmt << 24));
551 		break;
552 	}
553 
554 	pr_debug("rec_start: afmt=%d ch=%d  =>  fmt=0x%x swap=%c\n",
555 		runtime->format, runtime->channels, fmt,
556 		bswap ? 'b' : '-');
557 	/* dma: setup channel 6 (= AUDIO) */
558 	control = SAA7134_RS_CONTROL_BURST_16 |
559 		SAA7134_RS_CONTROL_ME |
560 		(dev->dmasound.pt.dma >> 12);
561 	if (bswap)
562 		control |= SAA7134_RS_CONTROL_BSWAP;
563 
564 	saa_writel(SAA7134_RS_BA1(6),0);
565 	saa_writel(SAA7134_RS_BA2(6),dev->dmasound.blksize);
566 	saa_writel(SAA7134_RS_PITCH(6),0);
567 	saa_writel(SAA7134_RS_CONTROL(6),control);
568 
569 	dev->dmasound.rate = runtime->rate;
570 
571 	/* Setup and update the card/ALSA controls */
572 	snd_saa7134_capsrc_set(saa7134->capture_ctl[dev->dmasound.input], 1, 1,
573 			       true);
574 
575 	return 0;
576 
577 }
578 
579 /*
580  * ALSA pointer fetching
581  *
582  *   - One of the ALSA capture callbacks.
583  *
584  *   Called whenever a period elapses, it must return the current hardware
585  *  position of the buffer.
586  *   Also resets the read counter used to prevent overruns
587  *
588  */
589 
590 static snd_pcm_uframes_t
591 snd_card_saa7134_capture_pointer(struct snd_pcm_substream * substream)
592 {
593 	struct snd_pcm_runtime *runtime = substream->runtime;
594 	snd_card_saa7134_pcm_t *pcm = runtime->private_data;
595 	struct saa7134_dev *dev=pcm->dev;
596 
597 	if (dev->dmasound.read_count) {
598 		dev->dmasound.read_count  -= snd_pcm_lib_period_bytes(substream);
599 		dev->dmasound.read_offset += snd_pcm_lib_period_bytes(substream);
600 		if (dev->dmasound.read_offset == dev->dmasound.bufsize)
601 			dev->dmasound.read_offset = 0;
602 	}
603 
604 	return bytes_to_frames(runtime, dev->dmasound.read_offset);
605 }
606 
607 /*
608  * ALSA hardware capabilities definition
609  *
610  *  Report only 32kHz for ALSA:
611  *
612  *  - SAA7133/35 uses DDEP (DemDec Easy Programming mode), which works in 32kHz
613  *    only
614  *  - SAA7134 for TV mode uses DemDec mode (32kHz)
615  *  - Radio works in 32kHz only
616  *  - When recording 48kHz from Line1/Line2, switching of capture source to TV
617  *    means
618  *    switching to 32kHz without any frequency translation
619  */
620 
621 static const struct snd_pcm_hardware snd_card_saa7134_capture =
622 {
623 	.info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
624 				 SNDRV_PCM_INFO_BLOCK_TRANSFER |
625 				 SNDRV_PCM_INFO_MMAP_VALID),
626 	.formats =		SNDRV_PCM_FMTBIT_S16_LE | \
627 				SNDRV_PCM_FMTBIT_S16_BE | \
628 				SNDRV_PCM_FMTBIT_S8 | \
629 				SNDRV_PCM_FMTBIT_U8 | \
630 				SNDRV_PCM_FMTBIT_U16_LE | \
631 				SNDRV_PCM_FMTBIT_U16_BE,
632 	.rates =		SNDRV_PCM_RATE_32000,
633 	.rate_min =		32000,
634 	.rate_max =		32000,
635 	.channels_min =		1,
636 	.channels_max =		2,
637 	.buffer_bytes_max =	(256*1024),
638 	.period_bytes_min =	64,
639 	.period_bytes_max =	(256*1024),
640 	.periods_min =		4,
641 	.periods_max =		1024,
642 };
643 
644 static void snd_card_saa7134_runtime_free(struct snd_pcm_runtime *runtime)
645 {
646 	snd_card_saa7134_pcm_t *pcm = runtime->private_data;
647 
648 	kfree(pcm);
649 }
650 
651 
652 /*
653  * ALSA hardware params
654  *
655  *   - One of the ALSA capture callbacks.
656  *
657  *   Called on initialization, right before the PCM preparation
658  *
659  */
660 
661 static int snd_card_saa7134_hw_params(struct snd_pcm_substream * substream,
662 				      struct snd_pcm_hw_params * hw_params)
663 {
664 	snd_card_saa7134_t *saa7134 = snd_pcm_substream_chip(substream);
665 	struct saa7134_dev *dev;
666 	unsigned int period_size, periods;
667 	int err;
668 
669 	period_size = params_period_bytes(hw_params);
670 	periods = params_periods(hw_params);
671 
672 	if (period_size < 0x100 || period_size > 0x10000)
673 		return -EINVAL;
674 	if (periods < 4)
675 		return -EINVAL;
676 	if (period_size * periods > 1024 * 1024)
677 		return -EINVAL;
678 
679 	dev = saa7134->dev;
680 
681 	if (dev->dmasound.blocks == periods &&
682 	    dev->dmasound.blksize == period_size)
683 		return 0;
684 
685 	/* release the old buffer */
686 	if (substream->runtime->dma_area) {
687 		saa7134_pgtable_free(dev->pci, &dev->dmasound.pt);
688 		saa7134_alsa_dma_unmap(dev);
689 		dsp_buffer_free(dev);
690 		substream->runtime->dma_area = NULL;
691 	}
692 	dev->dmasound.blocks  = periods;
693 	dev->dmasound.blksize = period_size;
694 	dev->dmasound.bufsize = period_size * periods;
695 
696 	err = dsp_buffer_init(dev);
697 	if (0 != err) {
698 		dev->dmasound.blocks  = 0;
699 		dev->dmasound.blksize = 0;
700 		dev->dmasound.bufsize = 0;
701 		return err;
702 	}
703 
704 	err = saa7134_alsa_dma_map(dev);
705 	if (err) {
706 		dsp_buffer_free(dev);
707 		return err;
708 	}
709 	err = saa7134_pgtable_alloc(dev->pci, &dev->dmasound.pt);
710 	if (err) {
711 		saa7134_alsa_dma_unmap(dev);
712 		dsp_buffer_free(dev);
713 		return err;
714 	}
715 	err = saa7134_pgtable_build(dev->pci, &dev->dmasound.pt,
716 				dev->dmasound.sglist, dev->dmasound.sglen, 0);
717 	if (err) {
718 		saa7134_pgtable_free(dev->pci, &dev->dmasound.pt);
719 		saa7134_alsa_dma_unmap(dev);
720 		dsp_buffer_free(dev);
721 		return err;
722 	}
723 
724 	/* I should be able to use runtime->dma_addr in the control
725 	   byte, but it doesn't work. So I allocate the DMA using the
726 	   V4L functions, and force ALSA to use that as the DMA area */
727 
728 	substream->runtime->dma_area = dev->dmasound.vaddr;
729 	substream->runtime->dma_bytes = dev->dmasound.bufsize;
730 	substream->runtime->dma_addr = 0;
731 
732 	return 0;
733 
734 }
735 
736 /*
737  * ALSA hardware release
738  *
739  *   - One of the ALSA capture callbacks.
740  *
741  *   Called after closing the device, but before snd_card_saa7134_capture_close
742  *   It stops the DMA audio and releases the buffers.
743  *
744  */
745 
746 static int snd_card_saa7134_hw_free(struct snd_pcm_substream * substream)
747 {
748 	snd_card_saa7134_t *saa7134 = snd_pcm_substream_chip(substream);
749 	struct saa7134_dev *dev;
750 
751 	dev = saa7134->dev;
752 
753 	if (substream->runtime->dma_area) {
754 		saa7134_pgtable_free(dev->pci, &dev->dmasound.pt);
755 		saa7134_alsa_dma_unmap(dev);
756 		dsp_buffer_free(dev);
757 		substream->runtime->dma_area = NULL;
758 	}
759 
760 	return 0;
761 }
762 
763 /*
764  * ALSA capture finish
765  *
766  *   - One of the ALSA capture callbacks.
767  *
768  *   Called after closing the device.
769  *
770  */
771 
772 static int snd_card_saa7134_capture_close(struct snd_pcm_substream * substream)
773 {
774 	snd_card_saa7134_t *saa7134 = snd_pcm_substream_chip(substream);
775 	struct saa7134_dev *dev = saa7134->dev;
776 
777 	if (saa7134->mute_was_on) {
778 		dev->ctl_mute = 1;
779 		saa7134_tvaudio_setmute(dev);
780 	}
781 	return 0;
782 }
783 
784 /*
785  * ALSA capture start
786  *
787  *   - One of the ALSA capture callbacks.
788  *
789  *   Called when opening the device. It creates and populates the PCM
790  *  structure
791  *
792  */
793 
794 static int snd_card_saa7134_capture_open(struct snd_pcm_substream * substream)
795 {
796 	struct snd_pcm_runtime *runtime = substream->runtime;
797 	snd_card_saa7134_pcm_t *pcm;
798 	snd_card_saa7134_t *saa7134 = snd_pcm_substream_chip(substream);
799 	struct saa7134_dev *dev;
800 	int amux, err;
801 
802 	if (!saa7134) {
803 		pr_err("BUG: saa7134 can't find device struct. Can't proceed with open\n");
804 		return -ENODEV;
805 	}
806 	dev = saa7134->dev;
807 	mutex_lock(&dev->dmasound.lock);
808 
809 	dev->dmasound.read_count  = 0;
810 	dev->dmasound.read_offset = 0;
811 
812 	amux = dev->input->amux;
813 	if ((amux < 1) || (amux > 3))
814 		amux = 1;
815 	dev->dmasound.input  =  amux - 1;
816 
817 	mutex_unlock(&dev->dmasound.lock);
818 
819 	pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
820 	if (pcm == NULL)
821 		return -ENOMEM;
822 
823 	pcm->dev=saa7134->dev;
824 
825 	spin_lock_init(&pcm->lock);
826 
827 	pcm->substream = substream;
828 	runtime->private_data = pcm;
829 	runtime->private_free = snd_card_saa7134_runtime_free;
830 	runtime->hw = snd_card_saa7134_capture;
831 
832 	if (dev->ctl_mute != 0) {
833 		saa7134->mute_was_on = 1;
834 		dev->ctl_mute = 0;
835 		saa7134_tvaudio_setmute(dev);
836 	}
837 
838 	err = snd_pcm_hw_constraint_integer(runtime,
839 						SNDRV_PCM_HW_PARAM_PERIODS);
840 	if (err < 0)
841 		return err;
842 
843 	err = snd_pcm_hw_constraint_step(runtime, 0,
844 						SNDRV_PCM_HW_PARAM_PERIODS, 2);
845 	if (err < 0)
846 		return err;
847 
848 	return 0;
849 }
850 
851 /*
852  * page callback (needed for mmap)
853  */
854 
855 static struct page *snd_card_saa7134_page(struct snd_pcm_substream *substream,
856 					unsigned long offset)
857 {
858 	void *pageptr = substream->runtime->dma_area + offset;
859 	return vmalloc_to_page(pageptr);
860 }
861 
862 /*
863  * ALSA capture callbacks definition
864  */
865 
866 static const struct snd_pcm_ops snd_card_saa7134_capture_ops = {
867 	.open =			snd_card_saa7134_capture_open,
868 	.close =		snd_card_saa7134_capture_close,
869 	.hw_params =		snd_card_saa7134_hw_params,
870 	.hw_free =		snd_card_saa7134_hw_free,
871 	.prepare =		snd_card_saa7134_capture_prepare,
872 	.trigger =		snd_card_saa7134_capture_trigger,
873 	.pointer =		snd_card_saa7134_capture_pointer,
874 	.page =			snd_card_saa7134_page,
875 };
876 
877 /*
878  * ALSA PCM setup
879  *
880  *   Called when initializing the board. Sets up the name and hooks up
881  *  the callbacks
882  *
883  */
884 
885 static int snd_card_saa7134_pcm(snd_card_saa7134_t *saa7134, int device)
886 {
887 	struct snd_pcm *pcm;
888 	int err;
889 
890 	if ((err = snd_pcm_new(saa7134->card, "SAA7134 PCM", device, 0, 1, &pcm)) < 0)
891 		return err;
892 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_card_saa7134_capture_ops);
893 	pcm->private_data = saa7134;
894 	pcm->info_flags = 0;
895 	strscpy(pcm->name, "SAA7134 PCM", sizeof(pcm->name));
896 	return 0;
897 }
898 
899 #define SAA713x_VOLUME(xname, xindex, addr) \
900 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
901   .info = snd_saa7134_volume_info, \
902   .get = snd_saa7134_volume_get, .put = snd_saa7134_volume_put, \
903   .private_value = addr }
904 
905 static int snd_saa7134_volume_info(struct snd_kcontrol * kcontrol,
906 				   struct snd_ctl_elem_info * uinfo)
907 {
908 	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
909 	uinfo->count = 2;
910 	uinfo->value.integer.min = 0;
911 	uinfo->value.integer.max = 20;
912 	return 0;
913 }
914 
915 static int snd_saa7134_volume_get(struct snd_kcontrol * kcontrol,
916 				  struct snd_ctl_elem_value * ucontrol)
917 {
918 	snd_card_saa7134_t *chip = snd_kcontrol_chip(kcontrol);
919 	int addr = kcontrol->private_value;
920 
921 	ucontrol->value.integer.value[0] = chip->mixer_volume[addr][0];
922 	ucontrol->value.integer.value[1] = chip->mixer_volume[addr][1];
923 	return 0;
924 }
925 
926 static int snd_saa7134_volume_put(struct snd_kcontrol * kcontrol,
927 				  struct snd_ctl_elem_value * ucontrol)
928 {
929 	snd_card_saa7134_t *chip = snd_kcontrol_chip(kcontrol);
930 	struct saa7134_dev *dev = chip->dev;
931 
932 	int change, addr = kcontrol->private_value;
933 	int left, right;
934 
935 	left = ucontrol->value.integer.value[0];
936 	if (left < 0)
937 		left = 0;
938 	if (left > 20)
939 		left = 20;
940 	right = ucontrol->value.integer.value[1];
941 	if (right < 0)
942 		right = 0;
943 	if (right > 20)
944 		right = 20;
945 	spin_lock_irq(&chip->mixer_lock);
946 	change = 0;
947 	if (chip->mixer_volume[addr][0] != left) {
948 		change = 1;
949 		right = left;
950 	}
951 	if (chip->mixer_volume[addr][1] != right) {
952 		change = 1;
953 		left = right;
954 	}
955 	if (change) {
956 		switch (dev->pci->device) {
957 			case PCI_DEVICE_ID_PHILIPS_SAA7134:
958 				switch (addr) {
959 					case MIXER_ADDR_TVTUNER:
960 						left = 20;
961 						break;
962 					case MIXER_ADDR_LINE1:
963 						saa_andorb(SAA7134_ANALOG_IO_SELECT,  0x10,
964 							   (left > 10) ? 0x00 : 0x10);
965 						break;
966 					case MIXER_ADDR_LINE2:
967 						saa_andorb(SAA7134_ANALOG_IO_SELECT,  0x20,
968 							   (left > 10) ? 0x00 : 0x20);
969 						break;
970 				}
971 				break;
972 			case PCI_DEVICE_ID_PHILIPS_SAA7133:
973 			case PCI_DEVICE_ID_PHILIPS_SAA7135:
974 				switch (addr) {
975 					case MIXER_ADDR_TVTUNER:
976 						left = 20;
977 						break;
978 					case MIXER_ADDR_LINE1:
979 						saa_andorb(0x0594,  0x10,
980 							   (left > 10) ? 0x00 : 0x10);
981 						break;
982 					case MIXER_ADDR_LINE2:
983 						saa_andorb(0x0594,  0x20,
984 							   (left > 10) ? 0x00 : 0x20);
985 						break;
986 				}
987 				break;
988 		}
989 		chip->mixer_volume[addr][0] = left;
990 		chip->mixer_volume[addr][1] = right;
991 	}
992 	spin_unlock_irq(&chip->mixer_lock);
993 	return change;
994 }
995 
996 #define SAA713x_CAPSRC(xname, xindex, addr) \
997 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
998   .info = snd_saa7134_capsrc_info, \
999   .get = snd_saa7134_capsrc_get, .put = snd_saa7134_capsrc_put, \
1000   .private_value = addr }
1001 
1002 static int snd_saa7134_capsrc_info(struct snd_kcontrol * kcontrol,
1003 				   struct snd_ctl_elem_info * uinfo)
1004 {
1005 	uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1006 	uinfo->count = 2;
1007 	uinfo->value.integer.min = 0;
1008 	uinfo->value.integer.max = 1;
1009 	return 0;
1010 }
1011 
1012 static int snd_saa7134_capsrc_get(struct snd_kcontrol * kcontrol,
1013 				  struct snd_ctl_elem_value * ucontrol)
1014 {
1015 	snd_card_saa7134_t *chip = snd_kcontrol_chip(kcontrol);
1016 	int addr = kcontrol->private_value;
1017 
1018 	spin_lock_irq(&chip->mixer_lock);
1019 	if (chip->capture_source_addr == addr) {
1020 		ucontrol->value.integer.value[0] = chip->capture_source[0];
1021 		ucontrol->value.integer.value[1] = chip->capture_source[1];
1022 	} else {
1023 		ucontrol->value.integer.value[0] = 0;
1024 		ucontrol->value.integer.value[1] = 0;
1025 	}
1026 	spin_unlock_irq(&chip->mixer_lock);
1027 
1028 	return 0;
1029 }
1030 
1031 static int snd_saa7134_capsrc_put(struct snd_kcontrol * kcontrol,
1032 				  struct snd_ctl_elem_value * ucontrol)
1033 {
1034 	int left, right;
1035 	left = ucontrol->value.integer.value[0] & 1;
1036 	right = ucontrol->value.integer.value[1] & 1;
1037 
1038 	return snd_saa7134_capsrc_set(kcontrol, left, right, false);
1039 }
1040 
1041 static struct snd_kcontrol_new snd_saa7134_volume_controls[] = {
1042 SAA713x_VOLUME("Video Volume", 0, MIXER_ADDR_TVTUNER),
1043 SAA713x_VOLUME("Line Volume", 1, MIXER_ADDR_LINE1),
1044 SAA713x_VOLUME("Line Volume", 2, MIXER_ADDR_LINE2),
1045 };
1046 
1047 static struct snd_kcontrol_new snd_saa7134_capture_controls[] = {
1048 SAA713x_CAPSRC("Video Capture Switch", 0, MIXER_ADDR_TVTUNER),
1049 SAA713x_CAPSRC("Line Capture Switch", 1, MIXER_ADDR_LINE1),
1050 SAA713x_CAPSRC("Line Capture Switch", 2, MIXER_ADDR_LINE2),
1051 };
1052 
1053 /*
1054  * ALSA mixer setup
1055  *
1056  *   Called when initializing the board. Sets up the name and hooks up
1057  *  the callbacks
1058  *
1059  */
1060 
1061 static int snd_card_saa7134_new_mixer(snd_card_saa7134_t * chip)
1062 {
1063 	struct snd_card *card = chip->card;
1064 	struct snd_kcontrol *kcontrol;
1065 	unsigned int idx;
1066 	int err, addr;
1067 
1068 	strscpy(card->mixername, "SAA7134 Mixer", sizeof(card->mixername));
1069 
1070 	for (idx = 0; idx < ARRAY_SIZE(snd_saa7134_volume_controls); idx++) {
1071 		kcontrol = snd_ctl_new1(&snd_saa7134_volume_controls[idx],
1072 					chip);
1073 		err = snd_ctl_add(card, kcontrol);
1074 		if (err < 0)
1075 			return err;
1076 	}
1077 
1078 	for (idx = 0; idx < ARRAY_SIZE(snd_saa7134_capture_controls); idx++) {
1079 		kcontrol = snd_ctl_new1(&snd_saa7134_capture_controls[idx],
1080 					chip);
1081 		addr = snd_saa7134_capture_controls[idx].private_value;
1082 		chip->capture_ctl[addr] = kcontrol;
1083 		err = snd_ctl_add(card, kcontrol);
1084 		if (err < 0)
1085 			return err;
1086 	}
1087 
1088 	chip->capture_source_addr = MIXER_ADDR_UNSELECTED;
1089 	return 0;
1090 }
1091 
1092 static void snd_saa7134_free(struct snd_card * card)
1093 {
1094 	snd_card_saa7134_t *chip = card->private_data;
1095 
1096 	if (chip->dev->dmasound.priv_data == NULL)
1097 		return;
1098 
1099 	if (chip->irq >= 0)
1100 		free_irq(chip->irq, &chip->dev->dmasound);
1101 
1102 	chip->dev->dmasound.priv_data = NULL;
1103 
1104 }
1105 
1106 /*
1107  * ALSA initialization
1108  *
1109  *   Called by the init routine, once for each saa7134 device present,
1110  *  it creates the basic structures and registers the ALSA devices
1111  *
1112  */
1113 
1114 static int alsa_card_saa7134_create(struct saa7134_dev *dev, int devnum)
1115 {
1116 
1117 	struct snd_card *card;
1118 	snd_card_saa7134_t *chip;
1119 	int err;
1120 
1121 
1122 	if (devnum >= SNDRV_CARDS)
1123 		return -ENODEV;
1124 	if (!enable[devnum])
1125 		return -ENODEV;
1126 
1127 	err = snd_card_new(&dev->pci->dev, index[devnum], id[devnum],
1128 			   THIS_MODULE, sizeof(snd_card_saa7134_t), &card);
1129 	if (err < 0)
1130 		return err;
1131 
1132 	strscpy(card->driver, "SAA7134", sizeof(card->driver));
1133 
1134 	/* Card "creation" */
1135 
1136 	card->private_free = snd_saa7134_free;
1137 	chip = card->private_data;
1138 
1139 	spin_lock_init(&chip->lock);
1140 	spin_lock_init(&chip->mixer_lock);
1141 
1142 	chip->dev = dev;
1143 
1144 	chip->card = card;
1145 
1146 	chip->pci = dev->pci;
1147 	chip->iobase = pci_resource_start(dev->pci, 0);
1148 
1149 
1150 	err = request_irq(dev->pci->irq, saa7134_alsa_irq,
1151 				IRQF_SHARED, dev->name,
1152 				(void*) &dev->dmasound);
1153 
1154 	if (err < 0) {
1155 		pr_err("%s: can't get IRQ %d for ALSA\n",
1156 			dev->name, dev->pci->irq);
1157 		goto __nodev;
1158 	}
1159 
1160 	chip->irq = dev->pci->irq;
1161 
1162 	mutex_init(&dev->dmasound.lock);
1163 
1164 	if ((err = snd_card_saa7134_new_mixer(chip)) < 0)
1165 		goto __nodev;
1166 
1167 	if ((err = snd_card_saa7134_pcm(chip, 0)) < 0)
1168 		goto __nodev;
1169 
1170 	/* End of "creation" */
1171 
1172 	strscpy(card->shortname, "SAA7134", sizeof(card->shortname));
1173 	sprintf(card->longname, "%s at 0x%lx irq %d",
1174 		chip->dev->name, chip->iobase, chip->irq);
1175 
1176 	pr_info("%s/alsa: %s registered as card %d\n",
1177 		dev->name, card->longname, index[devnum]);
1178 
1179 	if ((err = snd_card_register(card)) == 0) {
1180 		snd_saa7134_cards[devnum] = card;
1181 		return 0;
1182 	}
1183 
1184 __nodev:
1185 	snd_card_free(card);
1186 	return err;
1187 }
1188 
1189 
1190 static int alsa_device_init(struct saa7134_dev *dev)
1191 {
1192 	dev->dmasound.priv_data = dev;
1193 	alsa_card_saa7134_create(dev,dev->nr);
1194 	return 1;
1195 }
1196 
1197 static int alsa_device_exit(struct saa7134_dev *dev)
1198 {
1199 	if (!snd_saa7134_cards[dev->nr])
1200 		return 1;
1201 
1202 	snd_card_free(snd_saa7134_cards[dev->nr]);
1203 	snd_saa7134_cards[dev->nr] = NULL;
1204 	return 1;
1205 }
1206 
1207 /*
1208  * Module initializer
1209  *
1210  * Loops through present saa7134 cards, and assigns an ALSA device
1211  * to each one
1212  *
1213  */
1214 
1215 static int saa7134_alsa_init(void)
1216 {
1217 	struct saa7134_dev *dev;
1218 
1219 	saa7134_dmasound_init = alsa_device_init;
1220 	saa7134_dmasound_exit = alsa_device_exit;
1221 
1222 	pr_info("saa7134 ALSA driver for DMA sound loaded\n");
1223 
1224 	list_for_each_entry(dev, &saa7134_devlist, devlist) {
1225 		if (dev->pci->device == PCI_DEVICE_ID_PHILIPS_SAA7130)
1226 			pr_info("%s/alsa: %s doesn't support digital audio\n",
1227 				dev->name, saa7134_boards[dev->board].name);
1228 		else
1229 			alsa_device_init(dev);
1230 	}
1231 
1232 	if (list_empty(&saa7134_devlist))
1233 		pr_info("saa7134 ALSA: no saa7134 cards found\n");
1234 
1235 	return 0;
1236 
1237 }
1238 
1239 /*
1240  * Module destructor
1241  */
1242 
1243 static void saa7134_alsa_exit(void)
1244 {
1245 	int idx;
1246 
1247 	for (idx = 0; idx < SNDRV_CARDS; idx++) {
1248 		if (snd_saa7134_cards[idx])
1249 			snd_card_free(snd_saa7134_cards[idx]);
1250 	}
1251 
1252 	saa7134_dmasound_init = NULL;
1253 	saa7134_dmasound_exit = NULL;
1254 	pr_info("saa7134 ALSA driver for DMA sound unloaded\n");
1255 
1256 	return;
1257 }
1258 
1259 /* We initialize this late, to make sure the sound system is up and running */
1260 late_initcall(saa7134_alsa_init);
1261 module_exit(saa7134_alsa_exit);
1262 MODULE_LICENSE("GPL");
1263 MODULE_AUTHOR("Ricardo Cerqueira");
1264