1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24
25#include <linux/module.h>
26#include <linux/init.h>
27#include <linux/device.h>
28#include <linux/interrupt.h>
29#include <linux/vmalloc.h>
30#include <linux/dma-mapping.h>
31#include <linux/pci.h>
32#include <linux/slab.h>
33
34#include <linux/delay.h>
35#include <sound/core.h>
36#include <sound/pcm.h>
37#include <sound/pcm_params.h>
38#include <sound/control.h>
39#include <sound/initval.h>
40#include <sound/tlv.h>
41
42#include "cx25821.h"
43#include "cx25821-reg.h"
44
45#define AUDIO_SRAM_CHANNEL SRAM_CH08
46
47#define dprintk(level, fmt, arg...) \
48do { \
49 if (debug >= level) \
50 pr_info("%s/1: " fmt, chip->dev->name, ##arg); \
51} while (0)
52#define dprintk_core(level, fmt, arg...) \
53do { \
54 if (debug >= level) \
55 printk(KERN_DEBUG "%s/1: " fmt, chip->dev->name, ##arg); \
56} while (0)
57
58
59
60
61
62static int devno;
63
64struct cx25821_audio_buffer {
65 unsigned int bpl;
66 struct cx25821_riscmem risc;
67 void *vaddr;
68 struct scatterlist *sglist;
69 int sglen;
70 int nr_pages;
71};
72
73struct cx25821_audio_dev {
74 struct cx25821_dev *dev;
75 struct cx25821_dmaqueue q;
76
77
78 struct pci_dev *pci;
79
80
81 int irq;
82
83 struct snd_card *card;
84
85 unsigned long iobase;
86 spinlock_t reg_lock;
87 atomic_t count;
88
89 unsigned int dma_size;
90 unsigned int period_size;
91 unsigned int num_periods;
92
93 struct cx25821_audio_buffer *buf;
94
95 struct snd_pcm_substream *substream;
96};
97
98
99
100
101
102
103static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
104static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
105static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
106
107module_param_array(enable, bool, NULL, 0444);
108MODULE_PARM_DESC(enable, "Enable cx25821 soundcard. default enabled.");
109
110module_param_array(index, int, NULL, 0444);
111MODULE_PARM_DESC(index, "Index value for cx25821 capture interface(s).");
112
113
114
115
116
117MODULE_DESCRIPTION("ALSA driver module for cx25821 based capture cards");
118MODULE_AUTHOR("Hiep Huynh");
119MODULE_LICENSE("GPL");
120MODULE_SUPPORTED_DEVICE("{{Conexant,25821}");
121
122static unsigned int debug;
123module_param(debug, int, 0644);
124MODULE_PARM_DESC(debug, "enable debug messages");
125
126
127
128
129
130#define AUD_INT_DN_RISCI1 (1 << 0)
131#define AUD_INT_UP_RISCI1 (1 << 1)
132#define AUD_INT_RDS_DN_RISCI1 (1 << 2)
133#define AUD_INT_DN_RISCI2 (1 << 4)
134#define AUD_INT_UP_RISCI2 (1 << 5)
135#define AUD_INT_RDS_DN_RISCI2 (1 << 6)
136#define AUD_INT_DN_SYNC (1 << 12)
137#define AUD_INT_UP_SYNC (1 << 13)
138#define AUD_INT_RDS_DN_SYNC (1 << 14)
139#define AUD_INT_OPC_ERR (1 << 16)
140#define AUD_INT_BER_IRQ (1 << 20)
141#define AUD_INT_MCHG_IRQ (1 << 21)
142#define GP_COUNT_CONTROL_RESET 0x3
143
144#define PCI_MSK_AUD_EXT (1 << 4)
145#define PCI_MSK_AUD_INT (1 << 3)
146
147static int cx25821_alsa_dma_init(struct cx25821_audio_dev *chip, int nr_pages)
148{
149 struct cx25821_audio_buffer *buf = chip->buf;
150 struct page *pg;
151 int i;
152
153 buf->vaddr = vmalloc_32(nr_pages << PAGE_SHIFT);
154 if (NULL == buf->vaddr) {
155 dprintk(1, "vmalloc_32(%d pages) failed\n", nr_pages);
156 return -ENOMEM;
157 }
158
159 dprintk(1, "vmalloc is at addr 0x%08lx, size=%d\n",
160 (unsigned long)buf->vaddr,
161 nr_pages << PAGE_SHIFT);
162
163 memset(buf->vaddr, 0, nr_pages << PAGE_SHIFT);
164 buf->nr_pages = nr_pages;
165
166 buf->sglist = vzalloc(buf->nr_pages * sizeof(*buf->sglist));
167 if (NULL == buf->sglist)
168 goto vzalloc_err;
169
170 sg_init_table(buf->sglist, buf->nr_pages);
171 for (i = 0; i < buf->nr_pages; i++) {
172 pg = vmalloc_to_page(buf->vaddr + i * PAGE_SIZE);
173 if (NULL == pg)
174 goto vmalloc_to_page_err;
175 sg_set_page(&buf->sglist[i], pg, PAGE_SIZE, 0);
176 }
177 return 0;
178
179vmalloc_to_page_err:
180 vfree(buf->sglist);
181 buf->sglist = NULL;
182vzalloc_err:
183 vfree(buf->vaddr);
184 buf->vaddr = NULL;
185 return -ENOMEM;
186}
187
188static int cx25821_alsa_dma_map(struct cx25821_audio_dev *dev)
189{
190 struct cx25821_audio_buffer *buf = dev->buf;
191
192 buf->sglen = dma_map_sg(&dev->pci->dev, buf->sglist,
193 buf->nr_pages, PCI_DMA_FROMDEVICE);
194
195 if (0 == buf->sglen) {
196 pr_warn("%s: cx25821_alsa_map_sg failed\n", __func__);
197 return -ENOMEM;
198 }
199 return 0;
200}
201
202static int cx25821_alsa_dma_unmap(struct cx25821_audio_dev *dev)
203{
204 struct cx25821_audio_buffer *buf = dev->buf;
205
206 if (!buf->sglen)
207 return 0;
208
209 dma_unmap_sg(&dev->pci->dev, buf->sglist, buf->sglen, PCI_DMA_FROMDEVICE);
210 buf->sglen = 0;
211 return 0;
212}
213
214static int cx25821_alsa_dma_free(struct cx25821_audio_buffer *buf)
215{
216 vfree(buf->sglist);
217 buf->sglist = NULL;
218 vfree(buf->vaddr);
219 buf->vaddr = NULL;
220 return 0;
221}
222
223
224
225
226
227static int _cx25821_start_audio_dma(struct cx25821_audio_dev *chip)
228{
229 struct cx25821_audio_buffer *buf = chip->buf;
230 struct cx25821_dev *dev = chip->dev;
231 const struct sram_channel *audio_ch =
232 &cx25821_sram_channels[AUDIO_SRAM_CHANNEL];
233 u32 tmp = 0;
234
235
236 cx25821_set_gpiopin_direction(chip->dev, 0, 0);
237
238
239 cx_clear(AUD_INT_DMA_CTL,
240 FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN);
241
242
243 cx25821_sram_channel_setup_audio(chip->dev, audio_ch, buf->bpl,
244 buf->risc.dma);
245
246
247 cx_write(AUD_A_LNGTH, buf->bpl);
248
249
250
251 cx_write(AUD_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET);
252 atomic_set(&chip->count, 0);
253
254
255 tmp = cx_read(AUD_A_CFG);
256 cx_write(AUD_A_CFG, tmp | FLD_AUD_DST_PK_MODE | FLD_AUD_DST_ENABLE |
257 FLD_AUD_CLK_ENABLE);
258
259
260
261
262
263
264
265
266
267 cx_write(AUD_A_INT_MSK, FLD_AUD_DST_RISCI1 | FLD_AUD_DST_OF |
268 FLD_AUD_DST_SYNC | FLD_AUD_DST_OPC_ERR);
269
270
271 cx_write(AUD_A_INT_STAT, ~0);
272
273
274 cx_set(PCI_INT_MSK, chip->dev->pci_irqmask | PCI_MSK_AUD_INT);
275
276
277 tmp = cx_read(AUD_INT_DMA_CTL);
278 cx_set(AUD_INT_DMA_CTL, tmp |
279 (FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN));
280
281 mdelay(100);
282 return 0;
283}
284
285
286
287
288static int _cx25821_stop_audio_dma(struct cx25821_audio_dev *chip)
289{
290 struct cx25821_dev *dev = chip->dev;
291
292
293 cx_clear(AUD_INT_DMA_CTL,
294 FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN);
295
296
297 cx_clear(PCI_INT_MSK, PCI_MSK_AUD_INT);
298 cx_clear(AUD_A_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC |
299 AUD_INT_DN_RISCI2 | AUD_INT_DN_RISCI1);
300
301 return 0;
302}
303
304#define MAX_IRQ_LOOP 50
305
306
307
308
309static char *cx25821_aud_irqs[32] = {
310 "dn_risci1", "up_risci1", "rds_dn_risc1",
311 NULL,
312 "dn_risci2", "up_risci2", "rds_dn_risc2",
313 NULL,
314 "dnf_of", "upf_uf", "rds_dnf_uf",
315 NULL,
316 "dn_sync", "up_sync", "rds_dn_sync",
317 NULL,
318 "opc_err", "par_err", "rip_err",
319 "pci_abort", "ber_irq", "mchg_irq"
320};
321
322
323
324
325static void cx25821_aud_irq(struct cx25821_audio_dev *chip, u32 status,
326 u32 mask)
327{
328 struct cx25821_dev *dev = chip->dev;
329
330 if (0 == (status & mask))
331 return;
332
333 cx_write(AUD_A_INT_STAT, status);
334 if (debug > 1 || (status & mask & ~0xff))
335 cx25821_print_irqbits(dev->name, "irq aud", cx25821_aud_irqs,
336 ARRAY_SIZE(cx25821_aud_irqs), status, mask);
337
338
339 if (status & AUD_INT_OPC_ERR) {
340 pr_warn("WARNING %s/1: Audio risc op code error\n", dev->name);
341
342 cx_clear(AUD_INT_DMA_CTL,
343 FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN);
344 cx25821_sram_channel_dump_audio(dev,
345 &cx25821_sram_channels[AUDIO_SRAM_CHANNEL]);
346 }
347 if (status & AUD_INT_DN_SYNC) {
348 pr_warn("WARNING %s: Downstream sync error!\n", dev->name);
349 cx_write(AUD_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET);
350 return;
351 }
352
353
354 if (status & AUD_INT_DN_RISCI1) {
355 atomic_set(&chip->count, cx_read(AUD_A_GPCNT));
356 snd_pcm_period_elapsed(chip->substream);
357 }
358}
359
360
361
362
363static irqreturn_t cx25821_irq(int irq, void *dev_id)
364{
365 struct cx25821_audio_dev *chip = dev_id;
366 struct cx25821_dev *dev = chip->dev;
367 u32 status, pci_status;
368 u32 audint_status, audint_mask;
369 int loop, handled = 0;
370
371 audint_status = cx_read(AUD_A_INT_STAT);
372 audint_mask = cx_read(AUD_A_INT_MSK);
373 status = cx_read(PCI_INT_STAT);
374
375 for (loop = 0; loop < 1; loop++) {
376 status = cx_read(PCI_INT_STAT);
377 if (0 == status) {
378 status = cx_read(PCI_INT_STAT);
379 audint_status = cx_read(AUD_A_INT_STAT);
380 audint_mask = cx_read(AUD_A_INT_MSK);
381
382 if (status) {
383 handled = 1;
384 cx_write(PCI_INT_STAT, status);
385
386 cx25821_aud_irq(chip, audint_status,
387 audint_mask);
388 break;
389 } else {
390 goto out;
391 }
392 }
393
394 handled = 1;
395 cx_write(PCI_INT_STAT, status);
396
397 cx25821_aud_irq(chip, audint_status, audint_mask);
398 }
399
400 pci_status = cx_read(PCI_INT_STAT);
401
402 if (handled)
403 cx_write(PCI_INT_STAT, pci_status);
404
405out:
406 return IRQ_RETVAL(handled);
407}
408
409static int dsp_buffer_free(struct cx25821_audio_dev *chip)
410{
411 struct cx25821_riscmem *risc = &chip->buf->risc;
412
413 BUG_ON(!chip->dma_size);
414
415 dprintk(2, "Freeing buffer\n");
416 cx25821_alsa_dma_unmap(chip);
417 cx25821_alsa_dma_free(chip->buf);
418 pci_free_consistent(chip->pci, risc->size, risc->cpu, risc->dma);
419 kfree(chip->buf);
420
421 chip->buf = NULL;
422 chip->dma_size = 0;
423
424 return 0;
425}
426
427
428
429
430
431
432
433
434#define DEFAULT_FIFO_SIZE 384
435static struct snd_pcm_hardware snd_cx25821_digital_hw = {
436 .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
437 SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP_VALID,
438 .formats = SNDRV_PCM_FMTBIT_S16_LE,
439
440 .rates = SNDRV_PCM_RATE_48000,
441 .rate_min = 48000,
442 .rate_max = 48000,
443 .channels_min = 2,
444 .channels_max = 2,
445
446
447 .period_bytes_min = DEFAULT_FIFO_SIZE / 3,
448 .period_bytes_max = DEFAULT_FIFO_SIZE / 3,
449 .periods_min = 1,
450 .periods_max = AUDIO_LINE_SIZE,
451
452 .buffer_bytes_max = (AUDIO_LINE_SIZE * AUDIO_LINE_SIZE),
453};
454
455
456
457
458static int snd_cx25821_pcm_open(struct snd_pcm_substream *substream)
459{
460 struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream);
461 struct snd_pcm_runtime *runtime = substream->runtime;
462 int err;
463 unsigned int bpl = 0;
464
465 if (!chip) {
466 pr_err("DEBUG: cx25821 can't find device struct. Can't proceed with open\n");
467 return -ENODEV;
468 }
469
470 err = snd_pcm_hw_constraint_pow2(runtime, 0,
471 SNDRV_PCM_HW_PARAM_PERIODS);
472 if (err < 0)
473 goto _error;
474
475 chip->substream = substream;
476
477 runtime->hw = snd_cx25821_digital_hw;
478
479 if (cx25821_sram_channels[AUDIO_SRAM_CHANNEL].fifo_size !=
480 DEFAULT_FIFO_SIZE) {
481
482 bpl = cx25821_sram_channels[AUDIO_SRAM_CHANNEL].fifo_size / 3;
483 bpl &= ~7;
484
485 if (bpl > AUDIO_LINE_SIZE)
486 bpl = AUDIO_LINE_SIZE;
487
488 runtime->hw.period_bytes_min = bpl;
489 runtime->hw.period_bytes_max = bpl;
490 }
491
492 return 0;
493_error:
494 dprintk(1, "Error opening PCM!\n");
495 return err;
496}
497
498
499
500
501static int snd_cx25821_close(struct snd_pcm_substream *substream)
502{
503 return 0;
504}
505
506
507
508
509static int snd_cx25821_hw_params(struct snd_pcm_substream *substream,
510 struct snd_pcm_hw_params *hw_params)
511{
512 struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream);
513 struct cx25821_audio_buffer *buf;
514 int ret;
515
516 if (substream->runtime->dma_area) {
517 dsp_buffer_free(chip);
518 substream->runtime->dma_area = NULL;
519 }
520
521 chip->period_size = params_period_bytes(hw_params);
522 chip->num_periods = params_periods(hw_params);
523 chip->dma_size = chip->period_size * params_periods(hw_params);
524
525 BUG_ON(!chip->dma_size);
526 BUG_ON(chip->num_periods & (chip->num_periods - 1));
527
528 buf = kzalloc(sizeof(*buf), GFP_KERNEL);
529 if (NULL == buf)
530 return -ENOMEM;
531
532 if (chip->period_size > AUDIO_LINE_SIZE)
533 chip->period_size = AUDIO_LINE_SIZE;
534
535 buf->bpl = chip->period_size;
536 chip->buf = buf;
537
538 ret = cx25821_alsa_dma_init(chip,
539 (PAGE_ALIGN(chip->dma_size) >> PAGE_SHIFT));
540 if (ret < 0)
541 goto error;
542
543 ret = cx25821_alsa_dma_map(chip);
544 if (ret < 0)
545 goto error;
546
547 ret = cx25821_risc_databuffer_audio(chip->pci, &buf->risc, buf->sglist,
548 chip->period_size, chip->num_periods, 1);
549 if (ret < 0) {
550 pr_info("DEBUG: ERROR after cx25821_risc_databuffer_audio()\n");
551 goto error;
552 }
553
554
555 buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | RISC_CNT_INC);
556 buf->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
557 buf->risc.jmp[2] = cpu_to_le32(0);
558
559 substream->runtime->dma_area = chip->buf->vaddr;
560 substream->runtime->dma_bytes = chip->dma_size;
561 substream->runtime->dma_addr = 0;
562
563 return 0;
564
565error:
566 chip->buf = NULL;
567 kfree(buf);
568 return ret;
569}
570
571
572
573
574static int snd_cx25821_hw_free(struct snd_pcm_substream *substream)
575{
576 struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream);
577
578 if (substream->runtime->dma_area) {
579 dsp_buffer_free(chip);
580 substream->runtime->dma_area = NULL;
581 }
582
583 return 0;
584}
585
586
587
588
589static int snd_cx25821_prepare(struct snd_pcm_substream *substream)
590{
591 return 0;
592}
593
594
595
596
597static int snd_cx25821_card_trigger(struct snd_pcm_substream *substream,
598 int cmd)
599{
600 struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream);
601 int err = 0;
602
603
604 spin_lock(&chip->reg_lock);
605
606 switch (cmd) {
607 case SNDRV_PCM_TRIGGER_START:
608 err = _cx25821_start_audio_dma(chip);
609 break;
610 case SNDRV_PCM_TRIGGER_STOP:
611 err = _cx25821_stop_audio_dma(chip);
612 break;
613 default:
614 err = -EINVAL;
615 break;
616 }
617
618 spin_unlock(&chip->reg_lock);
619
620 return err;
621}
622
623
624
625
626static snd_pcm_uframes_t snd_cx25821_pointer(struct snd_pcm_substream
627 *substream)
628{
629 struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream);
630 struct snd_pcm_runtime *runtime = substream->runtime;
631 u16 count;
632
633 count = atomic_read(&chip->count);
634
635 return runtime->period_size * (count & (runtime->periods - 1));
636}
637
638
639
640
641static struct page *snd_cx25821_page(struct snd_pcm_substream *substream,
642 unsigned long offset)
643{
644 void *pageptr = substream->runtime->dma_area + offset;
645
646 return vmalloc_to_page(pageptr);
647}
648
649
650
651
652static struct snd_pcm_ops snd_cx25821_pcm_ops = {
653 .open = snd_cx25821_pcm_open,
654 .close = snd_cx25821_close,
655 .ioctl = snd_pcm_lib_ioctl,
656 .hw_params = snd_cx25821_hw_params,
657 .hw_free = snd_cx25821_hw_free,
658 .prepare = snd_cx25821_prepare,
659 .trigger = snd_cx25821_card_trigger,
660 .pointer = snd_cx25821_pointer,
661 .page = snd_cx25821_page,
662};
663
664
665
666
667
668static int snd_cx25821_pcm(struct cx25821_audio_dev *chip, int device,
669 char *name)
670{
671 struct snd_pcm *pcm;
672 int err;
673
674 err = snd_pcm_new(chip->card, name, device, 0, 1, &pcm);
675 if (err < 0) {
676 pr_info("ERROR: FAILED snd_pcm_new() in %s\n", __func__);
677 return err;
678 }
679 pcm->private_data = chip;
680 pcm->info_flags = 0;
681 strcpy(pcm->name, name);
682 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_cx25821_pcm_ops);
683
684 return 0;
685}
686
687
688
689
690
691
692
693
694
695
696static const struct pci_device_id __maybe_unused cx25821_audio_pci_tbl[] = {
697 {0x14f1, 0x0920, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
698 {0,}
699};
700
701MODULE_DEVICE_TABLE(pci, cx25821_audio_pci_tbl);
702
703
704
705
706static int cx25821_audio_initdev(struct cx25821_dev *dev)
707{
708 struct snd_card *card;
709 struct cx25821_audio_dev *chip;
710 int err;
711
712 if (devno >= SNDRV_CARDS) {
713 pr_info("DEBUG ERROR: devno >= SNDRV_CARDS %s\n", __func__);
714 return -ENODEV;
715 }
716
717 if (!enable[devno]) {
718 ++devno;
719 pr_info("DEBUG ERROR: !enable[devno] %s\n", __func__);
720 return -ENOENT;
721 }
722
723 err = snd_card_new(&dev->pci->dev, index[devno], id[devno],
724 THIS_MODULE,
725 sizeof(struct cx25821_audio_dev), &card);
726 if (err < 0) {
727 pr_info("DEBUG ERROR: cannot create snd_card_new in %s\n",
728 __func__);
729 return err;
730 }
731
732 strcpy(card->driver, "cx25821");
733
734
735 chip = card->private_data;
736 spin_lock_init(&chip->reg_lock);
737
738 chip->dev = dev;
739 chip->card = card;
740 chip->pci = dev->pci;
741 chip->iobase = pci_resource_start(dev->pci, 0);
742
743 chip->irq = dev->pci->irq;
744
745 err = request_irq(dev->pci->irq, cx25821_irq,
746 IRQF_SHARED, chip->dev->name, chip);
747
748 if (err < 0) {
749 pr_err("ERROR %s: can't get IRQ %d for ALSA\n", chip->dev->name,
750 dev->pci->irq);
751 goto error;
752 }
753
754 err = snd_cx25821_pcm(chip, 0, "cx25821 Digital");
755 if (err < 0) {
756 pr_info("DEBUG ERROR: cannot create snd_cx25821_pcm %s\n",
757 __func__);
758 goto error;
759 }
760
761 strcpy(card->shortname, "cx25821");
762 sprintf(card->longname, "%s at 0x%lx irq %d", chip->dev->name,
763 chip->iobase, chip->irq);
764 strcpy(card->mixername, "CX25821");
765
766 pr_info("%s/%i: ALSA support for cx25821 boards\n", card->driver,
767 devno);
768
769 err = snd_card_register(card);
770 if (err < 0) {
771 pr_info("DEBUG ERROR: cannot register sound card %s\n",
772 __func__);
773 goto error;
774 }
775
776 dev->card = card;
777 devno++;
778 return 0;
779
780error:
781 snd_card_free(card);
782 return err;
783}
784
785
786
787
788
789static int cx25821_alsa_exit_callback(struct device *dev, void *data)
790{
791 struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
792 struct cx25821_dev *cxdev = get_cx25821(v4l2_dev);
793
794 snd_card_free(cxdev->card);
795 return 0;
796}
797
798static void cx25821_audio_fini(void)
799{
800 struct device_driver *drv = driver_find("cx25821", &pci_bus_type);
801 int ret;
802
803 ret = driver_for_each_device(drv, NULL, NULL, cx25821_alsa_exit_callback);
804 if (ret)
805 pr_err("%s failed to find a cx25821 driver.\n", __func__);
806}
807
808static int cx25821_alsa_init_callback(struct device *dev, void *data)
809{
810 struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
811 struct cx25821_dev *cxdev = get_cx25821(v4l2_dev);
812
813 cx25821_audio_initdev(cxdev);
814 return 0;
815}
816
817
818
819
820
821
822
823
824static int cx25821_alsa_init(void)
825{
826 struct device_driver *drv = driver_find("cx25821", &pci_bus_type);
827
828 return driver_for_each_device(drv, NULL, NULL, cx25821_alsa_init_callback);
829
830}
831
832late_initcall(cx25821_alsa_init);
833module_exit(cx25821_audio_fini);
834
