Version:  2.0.40 2.2.26 2.4.37 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1

Linux/drivers/media/pci/cx25821/cx25821-alsa.c

  1 /*
  2  *  Driver for the Conexant CX25821 PCIe bridge
  3  *
  4  *  Copyright (C) 2009 Conexant Systems Inc.
  5  *  Authors  <shu.lin@conexant.com>, <hiep.huynh@conexant.com>
  6  *      Based on SAA713x ALSA driver and CX88 driver
  7  *
  8  *   This program is free software; you can redistribute it and/or modify
  9  *   it under the terms of the GNU General Public License as published by
 10  *   the Free Software Foundation, version 2
 11  *
 12  *   This program is distributed in the hope that it will be useful,
 13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 15  *   GNU General Public License for more details.
 16  *
 17  *   You should have received a copy of the GNU General Public License
 18  *   along with this program; if not, write to the Free Software
 19  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 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...)                             \
 48 do {                                                            \
 49         if (debug >= level)                                     \
 50                 pr_info("%s/1: " fmt, chip->dev->name, ##arg);  \
 51 } while (0)
 52 #define dprintk_core(level, fmt, arg...)                                \
 53 do {                                                                    \
 54         if (debug >= level)                                             \
 55                 printk(KERN_DEBUG "%s/1: " fmt, chip->dev->name, ##arg); \
 56 } while (0)
 57 
 58 /****************************************************************************
 59         Data type declarations - Can be moded to a header file later
 60  ****************************************************************************/
 61 
 62 static int devno;
 63 
 64 struct 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 
 73 struct cx25821_audio_dev {
 74         struct cx25821_dev *dev;
 75         struct cx25821_dmaqueue q;
 76 
 77         /* pci i/o */
 78         struct pci_dev *pci;
 79 
 80         /* audio controls */
 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                         Module global static vars
101  ****************************************************************************/
102 
103 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
104 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
105 static bool enable[SNDRV_CARDS] = { 1, [1 ... (SNDRV_CARDS - 1)] = 1 };
106 
107 module_param_array(enable, bool, NULL, 0444);
108 MODULE_PARM_DESC(enable, "Enable cx25821 soundcard. default enabled.");
109 
110 module_param_array(index, int, NULL, 0444);
111 MODULE_PARM_DESC(index, "Index value for cx25821 capture interface(s).");
112 
113 /****************************************************************************
114                                 Module macros
115  ****************************************************************************/
116 
117 MODULE_DESCRIPTION("ALSA driver module for cx25821 based capture cards");
118 MODULE_AUTHOR("Hiep Huynh");
119 MODULE_LICENSE("GPL");
120 MODULE_SUPPORTED_DEVICE("{{Conexant,25821}");   /* "{{Conexant,23881}," */
121 
122 static unsigned int debug;
123 module_param(debug, int, 0644);
124 MODULE_PARM_DESC(debug, "enable debug messages");
125 
126 /****************************************************************************
127                         Module specific funtions
128  ****************************************************************************/
129 /* Constants taken from cx88-reg.h */
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)       /* yes, 3 is skipped */
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 
147 static 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 
179 vmalloc_to_page_err:
180         vfree(buf->sglist);
181         buf->sglist = NULL;
182 vzalloc_err:
183         vfree(buf->vaddr);
184         buf->vaddr = NULL;
185         return -ENOMEM;
186 }
187 
188 static 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 
202 static 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 
214 static 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  * BOARD Specific: Sets audio DMA
225  */
226 
227 static 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         /* enable output on the GPIO 0 for the MCLK ADC (Audio) */
236         cx25821_set_gpiopin_direction(chip->dev, 0, 0);
237 
238         /* Make sure RISC/FIFO are off before changing FIFO/RISC settings */
239         cx_clear(AUD_INT_DMA_CTL,
240                  FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN);
241 
242         /* setup fifo + format - out channel */
243         cx25821_sram_channel_setup_audio(chip->dev, audio_ch, buf->bpl,
244                                          buf->risc.dma);
245 
246         /* sets bpl size */
247         cx_write(AUD_A_LNGTH, buf->bpl);
248 
249         /* reset counter */
250         /* GP_COUNT_CONTROL_RESET = 0x3 */
251         cx_write(AUD_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET);
252         atomic_set(&chip->count, 0);
253 
254         /* Set the input mode to 16-bit */
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         pr_info("DEBUG: Start audio DMA, %d B/line, cmds_start(0x%x)= %d lines/FIFO, %d periods, %d byte buffer\n",
261                 buf->bpl, audio_ch->cmds_start,
262                 cx_read(audio_ch->cmds_start + 12)>>1,
263                 chip->num_periods, buf->bpl * chip->num_periods);
264         */
265 
266         /* Enables corresponding bits at AUD_INT_STAT */
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         /* Clean any pending interrupt bits already set */
271         cx_write(AUD_A_INT_STAT, ~0);
272 
273         /* enable audio irqs */
274         cx_set(PCI_INT_MSK, chip->dev->pci_irqmask | PCI_MSK_AUD_INT);
275 
276         /* Turn on audio downstream fifo and risc enable 0x101 */
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  * BOARD Specific: Resets audio DMA
287  */
288 static int _cx25821_stop_audio_dma(struct cx25821_audio_dev *chip)
289 {
290         struct cx25821_dev *dev = chip->dev;
291 
292         /* stop dma */
293         cx_clear(AUD_INT_DMA_CTL,
294                  FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN);
295 
296         /* disable irqs */
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  * BOARD Specific: IRQ dma bits
308  */
309 static char *cx25821_aud_irqs[32] = {
310         "dn_risci1", "up_risci1", "rds_dn_risc1",       /* 0-2 */
311         NULL,                                           /* reserved */
312         "dn_risci2", "up_risci2", "rds_dn_risc2",       /* 4-6 */
313         NULL,                                           /* reserved */
314         "dnf_of", "upf_uf", "rds_dnf_uf",               /* 8-10 */
315         NULL,                                           /* reserved */
316         "dn_sync", "up_sync", "rds_dn_sync",            /* 12-14 */
317         NULL,                                           /* reserved */
318         "opc_err", "par_err", "rip_err",                /* 16-18 */
319         "pci_abort", "ber_irq", "mchg_irq"              /* 19-21 */
320 };
321 
322 /*
323  * BOARD Specific: Threats IRQ audio specific calls
324  */
325 static 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         /* risc op code error */
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         /* risc1 downstream */
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  * BOARD Specific: Handles IRQ calls
362  */
363 static 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 
405 out:
406         return IRQ_RETVAL(handled);
407 }
408 
409 static 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                                 ALSA PCM Interface
429  ****************************************************************************/
430 
431 /*
432  * Digital hardware definition
433  */
434 #define DEFAULT_FIFO_SIZE       384
435 static 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         /* Analog audio output will be full of clicks and pops if there
446            are not exactly four lines in the SRAM FIFO buffer.  */
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         /* 128 * 128 = 16384 = 1024 * 16 */
452         .buffer_bytes_max = (AUDIO_LINE_SIZE * AUDIO_LINE_SIZE),
453 };
454 
455 /*
456  * audio pcm capture open callback
457  */
458 static 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                 /* since there are 3 audio Clusters */
482                 bpl = cx25821_sram_channels[AUDIO_SRAM_CHANNEL].fifo_size / 3;
483                 bpl &= ~7;      /* must be multiple of 8 */
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  * audio close callback
500  */
501 static int snd_cx25821_close(struct snd_pcm_substream *substream)
502 {
503         return 0;
504 }
505 
506 /*
507  * hw_params callback
508  */
509 static 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         /* Loop back to start of program */
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);      /* bits 63-32 */
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 
565 error:
566         chip->buf = NULL;
567         kfree(buf);
568         return ret;
569 }
570 
571 /*
572  * hw free callback
573  */
574 static 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  * prepare callback
588  */
589 static int snd_cx25821_prepare(struct snd_pcm_substream *substream)
590 {
591         return 0;
592 }
593 
594 /*
595  * trigger callback
596  */
597 static 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         /* Local interrupts are already disabled by ALSA */
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  * pointer callback
625  */
626 static 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  * page callback (needed for mmap)
640  */
641 static 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  * operators
651  */
652 static 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  * ALSA create a PCM device:  Called when initializing the board.
666  * Sets up the name and hooks up the callbacks
667  */
668 static 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                         Basic Flow for Sound Devices
689  ****************************************************************************/
690 
691 /*
692  * PCI ID Table - 14f1:8801 and 14f1:8811 means function 1: Audio
693  * Only boards with eeprom and byte 1 at eeprom=1 have it
694  */
695 
696 static const struct pci_device_id cx25821_audio_pci_tbl[] = {
697         {0x14f1, 0x0920, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
698         {0,}
699 };
700 
701 MODULE_DEVICE_TABLE(pci, cx25821_audio_pci_tbl);
702 
703 /*
704  * Alsa Constructor - Component probe
705  */
706 static 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         /* Card "creation" */
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 
780 error:
781         snd_card_free(card);
782         return err;
783 }
784 
785 /****************************************************************************
786                                 LINUX MODULE INIT
787  ****************************************************************************/
788 
789 static 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 
798 static 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 
808 static 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  * Module initializer
819  *
820  * Loops through present saa7134 cards, and assigns an ALSA device
821  * to each one
822  *
823  */
824 static 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 
832 late_initcall(cx25821_alsa_init);
833 module_exit(cx25821_audio_fini);
834 

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