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