820 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Driver for the Conexant CX25821 PCIe bridge4 *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 driver8 */9 10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt11 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_CH0833 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 later47 ****************************************************************************/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 vars88 ****************************************************************************/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 macros102 ****************************************************************************/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 functions114 ****************************************************************************/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 0x3129 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 DMA212 */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 DMA274 */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 50292 293/*294 * BOARD Specific: IRQ dma bits295 */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 calls311 */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 calls349 */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 Interface416 ****************************************************************************/417 418/*419 * Digital hardware definition420 */421#define DEFAULT_FIFO_SIZE 384422static 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 there433 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 callback444 */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 callback487 */488static int snd_cx25821_close(struct snd_pcm_substream *substream)489{490 return 0;491}492 493/*494 * hw_params callback495 */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 goto error;539 }540 541 /* Loop back to start of program */542 buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | RISC_CNT_INC);543 buf->risc.jmp[1] = cpu_to_le32(buf->risc.dma);544 buf->risc.jmp[2] = cpu_to_le32(0); /* bits 63-32 */545 546 substream->runtime->dma_area = chip->buf->vaddr;547 substream->runtime->dma_bytes = chip->dma_size;548 substream->runtime->dma_addr = 0;549 550 return 0;551 552error:553 chip->buf = NULL;554 kfree(buf);555 return ret;556}557 558/*559 * hw free callback560 */561static int snd_cx25821_hw_free(struct snd_pcm_substream *substream)562{563 struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream);564 565 if (substream->runtime->dma_area) {566 dsp_buffer_free(chip);567 substream->runtime->dma_area = NULL;568 }569 570 return 0;571}572 573/*574 * prepare callback575 */576static int snd_cx25821_prepare(struct snd_pcm_substream *substream)577{578 return 0;579}580 581/*582 * trigger callback583 */584static int snd_cx25821_card_trigger(struct snd_pcm_substream *substream,585 int cmd)586{587 struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream);588 int err = 0;589 590 /* Local interrupts are already disabled by ALSA */591 spin_lock(&chip->reg_lock);592 593 switch (cmd) {594 case SNDRV_PCM_TRIGGER_START:595 err = _cx25821_start_audio_dma(chip);596 break;597 case SNDRV_PCM_TRIGGER_STOP:598 err = _cx25821_stop_audio_dma(chip);599 break;600 default:601 err = -EINVAL;602 break;603 }604 605 spin_unlock(&chip->reg_lock);606 607 return err;608}609 610/*611 * pointer callback612 */613static snd_pcm_uframes_t snd_cx25821_pointer(struct snd_pcm_substream614 *substream)615{616 struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream);617 struct snd_pcm_runtime *runtime = substream->runtime;618 u16 count;619 620 count = atomic_read(&chip->count);621 622 return runtime->period_size * (count & (runtime->periods - 1));623}624 625/*626 * page callback (needed for mmap)627 */628static struct page *snd_cx25821_page(struct snd_pcm_substream *substream,629 unsigned long offset)630{631 void *pageptr = substream->runtime->dma_area + offset;632 633 return vmalloc_to_page(pageptr);634}635 636/*637 * operators638 */639static const struct snd_pcm_ops snd_cx25821_pcm_ops = {640 .open = snd_cx25821_pcm_open,641 .close = snd_cx25821_close,642 .hw_params = snd_cx25821_hw_params,643 .hw_free = snd_cx25821_hw_free,644 .prepare = snd_cx25821_prepare,645 .trigger = snd_cx25821_card_trigger,646 .pointer = snd_cx25821_pointer,647 .page = snd_cx25821_page,648};649 650/*651 * ALSA create a PCM device: Called when initializing the board.652 * Sets up the name and hooks up the callbacks653 */654static int snd_cx25821_pcm(struct cx25821_audio_dev *chip, int device,655 char *name)656{657 struct snd_pcm *pcm;658 int err;659 660 err = snd_pcm_new(chip->card, name, device, 0, 1, &pcm);661 if (err < 0) {662 pr_info("ERROR: FAILED snd_pcm_new() in %s\n", __func__);663 return err;664 }665 pcm->private_data = chip;666 pcm->info_flags = 0;667 strscpy(pcm->name, name, sizeof(pcm->name));668 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_cx25821_pcm_ops);669 670 return 0;671}672 673/****************************************************************************674 Basic Flow for Sound Devices675 ****************************************************************************/676 677/*678 * PCI ID Table - 14f1:8801 and 14f1:8811 means function 1: Audio679 * Only boards with eeprom and byte 1 at eeprom=1 have it680 */681 682static const struct pci_device_id __maybe_unused cx25821_audio_pci_tbl[] = {683 {0x14f1, 0x0920, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},684 {0,}685};686 687MODULE_DEVICE_TABLE(pci, cx25821_audio_pci_tbl);688 689/*690 * Alsa Constructor - Component probe691 */692static int cx25821_audio_initdev(struct cx25821_dev *dev)693{694 struct snd_card *card;695 struct cx25821_audio_dev *chip;696 int err;697 698 if (devno >= SNDRV_CARDS) {699 pr_info("DEBUG ERROR: devno >= SNDRV_CARDS %s\n", __func__);700 return -ENODEV;701 }702 703 if (!enable[devno]) {704 ++devno;705 pr_info("DEBUG ERROR: !enable[devno] %s\n", __func__);706 return -ENOENT;707 }708 709 err = snd_card_new(&dev->pci->dev, index[devno], id[devno],710 THIS_MODULE,711 sizeof(struct cx25821_audio_dev), &card);712 if (err < 0) {713 pr_info("DEBUG ERROR: cannot create snd_card_new in %s\n",714 __func__);715 return err;716 }717 718 strscpy(card->driver, "cx25821", sizeof(card->driver));719 720 /* Card "creation" */721 chip = card->private_data;722 spin_lock_init(&chip->reg_lock);723 724 chip->dev = dev;725 chip->card = card;726 chip->pci = dev->pci;727 chip->iobase = pci_resource_start(dev->pci, 0);728 729 chip->irq = dev->pci->irq;730 731 err = devm_request_irq(&dev->pci->dev, dev->pci->irq, cx25821_irq,732 IRQF_SHARED, chip->dev->name, chip);733 734 if (err < 0) {735 pr_err("ERROR %s: can't get IRQ %d for ALSA\n", chip->dev->name,736 dev->pci->irq);737 goto error;738 }739 740 err = snd_cx25821_pcm(chip, 0, "cx25821 Digital");741 if (err < 0) {742 pr_info("DEBUG ERROR: cannot create snd_cx25821_pcm %s\n",743 __func__);744 goto error;745 }746 747 strscpy(card->shortname, "cx25821", sizeof(card->shortname));748 sprintf(card->longname, "%s at 0x%lx irq %d", chip->dev->name,749 chip->iobase, chip->irq);750 strscpy(card->mixername, "CX25821", sizeof(card->mixername));751 752 pr_info("%s/%i: ALSA support for cx25821 boards\n", card->driver,753 devno);754 755 err = snd_card_register(card);756 if (err < 0) {757 pr_info("DEBUG ERROR: cannot register sound card %s\n",758 __func__);759 goto error;760 }761 762 dev->card = card;763 devno++;764 return 0;765 766error:767 snd_card_free(card);768 return err;769}770 771/****************************************************************************772 LINUX MODULE INIT773 ****************************************************************************/774 775static int cx25821_alsa_exit_callback(struct device *dev, void *data)776{777 struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);778 struct cx25821_dev *cxdev = get_cx25821(v4l2_dev);779 780 snd_card_free(cxdev->card);781 return 0;782}783 784static void cx25821_audio_fini(void)785{786 struct device_driver *drv = driver_find("cx25821", &pci_bus_type);787 int ret;788 789 ret = driver_for_each_device(drv, NULL, NULL, cx25821_alsa_exit_callback);790 if (ret)791 pr_err("%s failed to find a cx25821 driver.\n", __func__);792}793 794static int cx25821_alsa_init_callback(struct device *dev, void *data)795{796 struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);797 struct cx25821_dev *cxdev = get_cx25821(v4l2_dev);798 799 cx25821_audio_initdev(cxdev);800 return 0;801}802 803/*804 * Module initializer805 *806 * Loops through present saa7134 cards, and assigns an ALSA device807 * to each one808 *809 */810static int cx25821_alsa_init(void)811{812 struct device_driver *drv = driver_find("cx25821", &pci_bus_type);813 814 return driver_for_each_device(drv, NULL, NULL, cx25821_alsa_init_callback);815 816}817 818late_initcall(cx25821_alsa_init);819module_exit(cx25821_audio_fini);820