cx25821-alsa.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 *  Driver for the Conexant CX25821 PCIe bridge
  4 *
  5 *  Copyright (C) 2009 Conexant Systems Inc.
  6 *  Authors  <shu.lin@conexant.com>, <hiep.huynh@conexant.com>
  7 *	Based on SAA713x ALSA driver and CX88 driver
  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	Data type declarations - Can be moded to a header file later
 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	/* pci i/o */
 65	struct pci_dev *pci;
 66
 67	/* audio controls */
 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			Module global static vars
 88 ****************************************************************************/
 89
 90static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;	/* Index 0-MAX */
 91static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;	/* ID for this card */
 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				Module macros
102 ****************************************************************************/
103
104MODULE_DESCRIPTION("ALSA driver module for cx25821 based capture cards");
105MODULE_AUTHOR("Hiep Huynh");
106MODULE_LICENSE("GPL");
107
108static unsigned int debug;
109module_param(debug, int, 0644);
110MODULE_PARM_DESC(debug, "enable debug messages");
111
112/****************************************************************************
113			Module specific functions
114 ****************************************************************************/
115/* Constants taken from cx88-reg.h */
116#define AUD_INT_DN_RISCI1       (1 <<  0)
117#define AUD_INT_UP_RISCI1       (1 <<  1)
118#define AUD_INT_RDS_DN_RISCI1   (1 <<  2)
119#define AUD_INT_DN_RISCI2       (1 <<  4)	/* yes, 3 is skipped */
120#define AUD_INT_UP_RISCI2       (1 <<  5)
121#define AUD_INT_RDS_DN_RISCI2   (1 <<  6)
122#define AUD_INT_DN_SYNC         (1 << 12)
123#define AUD_INT_UP_SYNC         (1 << 13)
124#define AUD_INT_RDS_DN_SYNC     (1 << 14)
125#define AUD_INT_OPC_ERR         (1 << 16)
126#define AUD_INT_BER_IRQ         (1 << 20)
127#define AUD_INT_MCHG_IRQ        (1 << 21)
128#define GP_COUNT_CONTROL_RESET	0x3
129
130#define PCI_MSK_AUD_EXT   (1 <<  4)
131#define PCI_MSK_AUD_INT   (1 <<  3)
132
133static int cx25821_alsa_dma_init(struct cx25821_audio_dev *chip,
134				 unsigned long nr_pages)
135{
136	struct cx25821_audio_buffer *buf = chip->buf;
137	struct page *pg;
138	int i;
139
140	buf->vaddr = vmalloc_32(nr_pages << PAGE_SHIFT);
141	if (NULL == buf->vaddr) {
142		dprintk(1, "vmalloc_32(%lu pages) failed\n", nr_pages);
143		return -ENOMEM;
144	}
145
146	dprintk(1, "vmalloc is at addr 0x%p, size=%lu\n",
147				buf->vaddr,
148				nr_pages << PAGE_SHIFT);
149
150	memset(buf->vaddr, 0, nr_pages << PAGE_SHIFT);
151	buf->nr_pages = nr_pages;
152
153	buf->sglist = vzalloc(array_size(sizeof(*buf->sglist), buf->nr_pages));
154	if (NULL == buf->sglist)
155		goto vzalloc_err;
156
157	sg_init_table(buf->sglist, buf->nr_pages);
158	for (i = 0; i < buf->nr_pages; i++) {
159		pg = vmalloc_to_page(buf->vaddr + i * PAGE_SIZE);
160		if (NULL == pg)
161			goto vmalloc_to_page_err;
162		sg_set_page(&buf->sglist[i], pg, PAGE_SIZE, 0);
163	}
164	return 0;
165
166vmalloc_to_page_err:
167	vfree(buf->sglist);
168	buf->sglist = NULL;
169vzalloc_err:
170	vfree(buf->vaddr);
171	buf->vaddr = NULL;
172	return -ENOMEM;
173}
174
175static int cx25821_alsa_dma_map(struct cx25821_audio_dev *dev)
176{
177	struct cx25821_audio_buffer *buf = dev->buf;
178
179	buf->sglen = dma_map_sg(&dev->pci->dev, buf->sglist,
180			buf->nr_pages, DMA_FROM_DEVICE);
181
182	if (0 == buf->sglen) {
183		pr_warn("%s: cx25821_alsa_map_sg failed\n", __func__);
184		return -ENOMEM;
185	}
186	return 0;
187}
188
189static int cx25821_alsa_dma_unmap(struct cx25821_audio_dev *dev)
190{
191	struct cx25821_audio_buffer *buf = dev->buf;
192
193	if (!buf->sglen)
194		return 0;
195
196	dma_unmap_sg(&dev->pci->dev, buf->sglist, buf->nr_pages, DMA_FROM_DEVICE);
197	buf->sglen = 0;
198	return 0;
199}
200
201static int cx25821_alsa_dma_free(struct cx25821_audio_buffer *buf)
202{
203	vfree(buf->sglist);
204	buf->sglist = NULL;
205	vfree(buf->vaddr);
206	buf->vaddr = NULL;
207	return 0;
208}
209
210/*
211 * BOARD Specific: Sets audio DMA
212 */
213
214static int _cx25821_start_audio_dma(struct cx25821_audio_dev *chip)
215{
216	struct cx25821_audio_buffer *buf = chip->buf;
217	struct cx25821_dev *dev = chip->dev;
218	const struct sram_channel *audio_ch =
219	    &cx25821_sram_channels[AUDIO_SRAM_CHANNEL];
220	u32 tmp = 0;
221
222	/* enable output on the GPIO 0 for the MCLK ADC (Audio) */
223	cx25821_set_gpiopin_direction(chip->dev, 0, 0);
224
225	/* Make sure RISC/FIFO are off before changing FIFO/RISC settings */
226	cx_clear(AUD_INT_DMA_CTL,
227		 FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN);
228
229	/* setup fifo + format - out channel */
230	cx25821_sram_channel_setup_audio(chip->dev, audio_ch, buf->bpl,
231					 buf->risc.dma);
232
233	/* sets bpl size */
234	cx_write(AUD_A_LNGTH, buf->bpl);
235
236	/* reset counter */
237	/* GP_COUNT_CONTROL_RESET = 0x3 */
238	cx_write(AUD_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET);
239	atomic_set(&chip->count, 0);
240
241	/* Set the input mode to 16-bit */
242	tmp = cx_read(AUD_A_CFG);
243	cx_write(AUD_A_CFG, tmp | FLD_AUD_DST_PK_MODE | FLD_AUD_DST_ENABLE |
244		 FLD_AUD_CLK_ENABLE);
245
246	/*
247	pr_info("DEBUG: Start audio DMA, %d B/line, cmds_start(0x%x)= %d lines/FIFO, %d periods, %d byte buffer\n",
248		buf->bpl, audio_ch->cmds_start,
249		cx_read(audio_ch->cmds_start + 12)>>1,
250		chip->num_periods, buf->bpl * chip->num_periods);
251	*/
252
253	/* Enables corresponding bits at AUD_INT_STAT */
254	cx_write(AUD_A_INT_MSK, FLD_AUD_DST_RISCI1 | FLD_AUD_DST_OF |
255		 FLD_AUD_DST_SYNC | FLD_AUD_DST_OPC_ERR);
256
257	/* Clean any pending interrupt bits already set */
258	cx_write(AUD_A_INT_STAT, ~0);
259
260	/* enable audio irqs */
261	cx_set(PCI_INT_MSK, chip->dev->pci_irqmask | PCI_MSK_AUD_INT);
262
263	/* Turn on audio downstream fifo and risc enable 0x101 */
264	tmp = cx_read(AUD_INT_DMA_CTL);
265	cx_set(AUD_INT_DMA_CTL, tmp |
266	       (FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN));
267
268	mdelay(100);
269	return 0;
270}
271
272/*
273 * BOARD Specific: Resets audio DMA
274 */
275static int _cx25821_stop_audio_dma(struct cx25821_audio_dev *chip)
276{
277	struct cx25821_dev *dev = chip->dev;
278
279	/* stop dma */
280	cx_clear(AUD_INT_DMA_CTL,
281		 FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN);
282
283	/* disable irqs */
284	cx_clear(PCI_INT_MSK, PCI_MSK_AUD_INT);
285	cx_clear(AUD_A_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC |
286		 AUD_INT_DN_RISCI2 | AUD_INT_DN_RISCI1);
287
288	return 0;
289}
290
291#define MAX_IRQ_LOOP 50
292
293/*
294 * BOARD Specific: IRQ dma bits
295 */
296static char *cx25821_aud_irqs[32] = {
297	"dn_risci1", "up_risci1", "rds_dn_risc1",	/* 0-2 */
298	NULL,						/* reserved */
299	"dn_risci2", "up_risci2", "rds_dn_risc2",	/* 4-6 */
300	NULL,						/* reserved */
301	"dnf_of", "upf_uf", "rds_dnf_uf",		/* 8-10 */
302	NULL,						/* reserved */
303	"dn_sync", "up_sync", "rds_dn_sync",		/* 12-14 */
304	NULL,						/* reserved */
305	"opc_err", "par_err", "rip_err",		/* 16-18 */
306	"pci_abort", "ber_irq", "mchg_irq"		/* 19-21 */
307};
308
309/*
310 * BOARD Specific: Threats IRQ audio specific calls
311 */
312static void cx25821_aud_irq(struct cx25821_audio_dev *chip, u32 status,
313			    u32 mask)
314{
315	struct cx25821_dev *dev = chip->dev;
316
317	if (0 == (status & mask))
318		return;
319
320	cx_write(AUD_A_INT_STAT, status);
321	if (debug > 1 || (status & mask & ~0xff))
322		cx25821_print_irqbits(dev->name, "irq aud", cx25821_aud_irqs,
323				ARRAY_SIZE(cx25821_aud_irqs), status, mask);
324
325	/* risc op code error */
326	if (status & AUD_INT_OPC_ERR) {
327		pr_warn("WARNING %s/1: Audio risc op code error\n", dev->name);
328
329		cx_clear(AUD_INT_DMA_CTL,
330			 FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN);
331		cx25821_sram_channel_dump_audio(dev,
332				&cx25821_sram_channels[AUDIO_SRAM_CHANNEL]);
333	}
334	if (status & AUD_INT_DN_SYNC) {
335		pr_warn("WARNING %s: Downstream sync error!\n", dev->name);
336		cx_write(AUD_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET);
337		return;
338	}
339
340	/* risc1 downstream */
341	if (status & AUD_INT_DN_RISCI1) {
342		atomic_set(&chip->count, cx_read(AUD_A_GPCNT));
343		snd_pcm_period_elapsed(chip->substream);
344	}
345}
346
347/*
348 * BOARD Specific: Handles IRQ calls
349 */
350static irqreturn_t cx25821_irq(int irq, void *dev_id)
351{
352	struct cx25821_audio_dev *chip = dev_id;
353	struct cx25821_dev *dev = chip->dev;
354	u32 status, pci_status;
355	u32 audint_status, audint_mask;
356	int loop, handled = 0;
357
358	audint_status = cx_read(AUD_A_INT_STAT);
359	audint_mask = cx_read(AUD_A_INT_MSK);
360	status = cx_read(PCI_INT_STAT);
361
362	for (loop = 0; loop < 1; loop++) {
363		status = cx_read(PCI_INT_STAT);
364		if (0 == status) {
365			status = cx_read(PCI_INT_STAT);
366			audint_status = cx_read(AUD_A_INT_STAT);
367			audint_mask = cx_read(AUD_A_INT_MSK);
368
369			if (status) {
370				handled = 1;
371				cx_write(PCI_INT_STAT, status);
372
373				cx25821_aud_irq(chip, audint_status,
374						audint_mask);
375				break;
376			} else {
377				goto out;
378			}
379		}
380
381		handled = 1;
382		cx_write(PCI_INT_STAT, status);
383
384		cx25821_aud_irq(chip, audint_status, audint_mask);
385	}
386
387	pci_status = cx_read(PCI_INT_STAT);
388
389	if (handled)
390		cx_write(PCI_INT_STAT, pci_status);
391
392out:
393	return IRQ_RETVAL(handled);
394}
395
396static int dsp_buffer_free(struct cx25821_audio_dev *chip)
397{
398	struct cx25821_riscmem *risc = &chip->buf->risc;
399
400	BUG_ON(!chip->dma_size);
401
402	dprintk(2, "Freeing buffer\n");
403	cx25821_alsa_dma_unmap(chip);
404	cx25821_alsa_dma_free(chip->buf);
405	dma_free_coherent(&chip->pci->dev, risc->size, risc->cpu, risc->dma);
406	kfree(chip->buf);
407
408	chip->buf = NULL;
409	chip->dma_size = 0;
410
411	return 0;
412}
413
414/****************************************************************************
415				ALSA PCM Interface
416 ****************************************************************************/
417
418/*
419 * Digital hardware definition
420 */
421#define DEFAULT_FIFO_SIZE	384
422static const struct snd_pcm_hardware snd_cx25821_digital_hw = {
423	.info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
424		SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP_VALID,
425	.formats = SNDRV_PCM_FMTBIT_S16_LE,
426
427	.rates = SNDRV_PCM_RATE_48000,
428	.rate_min = 48000,
429	.rate_max = 48000,
430	.channels_min = 2,
431	.channels_max = 2,
432	/* Analog audio output will be full of clicks and pops if there
433	   are not exactly four lines in the SRAM FIFO buffer.  */
434	.period_bytes_min = DEFAULT_FIFO_SIZE / 3,
435	.period_bytes_max = DEFAULT_FIFO_SIZE / 3,
436	.periods_min = 1,
437	.periods_max = AUDIO_LINE_SIZE,
438	/* 128 * 128 = 16384 = 1024 * 16 */
439	.buffer_bytes_max = (AUDIO_LINE_SIZE * AUDIO_LINE_SIZE),
440};
441
442/*
443 * audio pcm capture open callback
444 */
445static int snd_cx25821_pcm_open(struct snd_pcm_substream *substream)
446{
447	struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream);
448	struct snd_pcm_runtime *runtime = substream->runtime;
449	int err;
450	unsigned int bpl = 0;
451
452	if (!chip) {
453		pr_err("DEBUG: cx25821 can't find device struct. Can't proceed with open\n");
454		return -ENODEV;
455	}
456
457	err = snd_pcm_hw_constraint_pow2(runtime, 0,
458					 SNDRV_PCM_HW_PARAM_PERIODS);
459	if (err < 0)
460		goto _error;
461
462	chip->substream = substream;
463
464	runtime->hw = snd_cx25821_digital_hw;
465
466	if (cx25821_sram_channels[AUDIO_SRAM_CHANNEL].fifo_size !=
467	    DEFAULT_FIFO_SIZE) {
468		/* since there are 3 audio Clusters */
469		bpl = cx25821_sram_channels[AUDIO_SRAM_CHANNEL].fifo_size / 3;
470		bpl &= ~7;	/* must be multiple of 8 */
471
472		if (bpl > AUDIO_LINE_SIZE)
473			bpl = AUDIO_LINE_SIZE;
474
475		runtime->hw.period_bytes_min = bpl;
476		runtime->hw.period_bytes_max = bpl;
477	}
478
479	return 0;
480_error:
481	dprintk(1, "Error opening PCM!\n");
482	return err;
483}
484
485/*
486 * audio close callback
487 */
488static int snd_cx25821_close(struct snd_pcm_substream *substream)
489{
490	return 0;
491}
492
493/*
494 * hw_params callback
495 */
496static int snd_cx25821_hw_params(struct snd_pcm_substream *substream,
497				 struct snd_pcm_hw_params *hw_params)
498{
499	struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream);
500	struct cx25821_audio_buffer *buf;
501	int ret;
502
503	if (substream->runtime->dma_area) {
504		dsp_buffer_free(chip);
505		substream->runtime->dma_area = NULL;
506	}
507
508	chip->period_size = params_period_bytes(hw_params);
509	chip->num_periods = params_periods(hw_params);
510	chip->dma_size = chip->period_size * params_periods(hw_params);
511
512	BUG_ON(!chip->dma_size);
513	BUG_ON(chip->num_periods & (chip->num_periods - 1));
514
515	buf = kzalloc(sizeof(*buf), GFP_KERNEL);
516	if (NULL == buf)
517		return -ENOMEM;
518
519	if (chip->period_size > AUDIO_LINE_SIZE)
520		chip->period_size = AUDIO_LINE_SIZE;
521
522	buf->bpl = chip->period_size;
523	chip->buf = buf;
524
525	ret = cx25821_alsa_dma_init(chip,
526			(PAGE_ALIGN(chip->dma_size) >> PAGE_SHIFT));
527	if (ret < 0)
528		goto error;
529
530	ret = cx25821_alsa_dma_map(chip);
531	if (ret < 0)
532		goto error;
533
534	ret = cx25821_risc_databuffer_audio(chip->pci, &buf->risc, buf->sglist,
535			chip->period_size, chip->num_periods, 1);
536	if (ret < 0) {
537		pr_info("DEBUG: ERROR after cx25821_risc_databuffer_audio()\n");
538		cx25821_alsa_dma_unmap(chip);
539		goto error;
540	}
541
542	/* Loop back to start of program */
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);	/* bits 63-32 */
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 * hw free callback
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 * prepare callback
576 */
577static int snd_cx25821_prepare(struct snd_pcm_substream *substream)
578{
579	return 0;
580}
581
582/*
583 * trigger callback
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	/* Local interrupts are already disabled by ALSA */
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 * pointer callback
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 * page callback (needed for mmap)
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 * operators
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 * ALSA create a PCM device:  Called when initializing the board.
653 * Sets up the name and hooks up the callbacks
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			Basic Flow for Sound Devices
676 ****************************************************************************/
677
678/*
679 * PCI ID Table - 14f1:8801 and 14f1:8811 means function 1: Audio
680 * Only boards with eeprom and byte 1 at eeprom=1 have it
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 * Alsa Constructor - Component probe
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	/* Card "creation" */
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 = devm_request_irq(&dev->pci->dev, 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				LINUX MODULE INIT
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 * Module initializer
806 *
807 * Loops through present saa7134 cards, and assigns an ALSA device
808 * to each one
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);