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[net-next-2.6.git] / drivers / staging / 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 #include <linux/module.h>
24 #include <linux/init.h>
25 #include <linux/device.h>
26 #include <linux/interrupt.h>
27 #include <linux/vmalloc.h>
28 #include <linux/dma-mapping.h>
29 #include <linux/pci.h>
30 #include <linux/slab.h>
31
32 #include <asm/delay.h>
33 #include <sound/core.h>
34 #include <sound/pcm.h>
35 #include <sound/pcm_params.h>
36 #include <sound/control.h>
37 #include <sound/initval.h>
38 #include <sound/tlv.h>
39
40 #include "cx25821.h"
41 #include "cx25821-reg.h"
42
43 #define AUDIO_SRAM_CHANNEL      SRAM_CH08
44
45 #define dprintk(level,fmt, arg...)      if (debug >= level) \
46         printk(KERN_INFO "%s/1: " fmt, chip->dev->name , ## arg)
47
48 #define dprintk_core(level,fmt, arg...) if (debug >= level) \
49         printk(KERN_DEBUG "%s/1: " fmt, chip->dev->name , ## arg)
50
51 /****************************************************************************
52         Data type declarations - Can be moded to a header file later
53  ****************************************************************************/
54
55 static struct snd_card *snd_cx25821_cards[SNDRV_CARDS];
56 static int devno;
57
58 struct cx25821_audio_dev {
59         struct cx25821_dev *dev;
60         struct cx25821_dmaqueue q;
61
62         /* pci i/o */
63         struct pci_dev *pci;
64
65         /* audio controls */
66         int irq;
67
68         struct snd_card *card;
69
70         unsigned long iobase;
71         spinlock_t reg_lock;
72         atomic_t count;
73
74         unsigned int dma_size;
75         unsigned int period_size;
76         unsigned int num_periods;
77
78         struct videobuf_dmabuf *dma_risc;
79
80         struct cx25821_buffer *buf;
81
82         struct snd_pcm_substream *substream;
83 };
84 typedef struct cx25821_audio_dev snd_cx25821_card_t;
85
86
87 /****************************************************************************
88                         Module global static vars
89  ****************************************************************************/
90
91 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
92 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
93 static int enable[SNDRV_CARDS] = { 1,[1 ... (SNDRV_CARDS - 1)] = 1 };
94
95 module_param_array(enable, bool, NULL, 0444);
96 MODULE_PARM_DESC(enable, "Enable cx25821 soundcard. default enabled.");
97
98 module_param_array(index, int, NULL, 0444);
99 MODULE_PARM_DESC(index, "Index value for cx25821 capture interface(s).");
100
101 /****************************************************************************
102                                 Module macros
103  ****************************************************************************/
104
105 MODULE_DESCRIPTION("ALSA driver module for cx25821 based capture cards");
106 MODULE_AUTHOR("Hiep Huynh");
107 MODULE_LICENSE("GPL");
108 MODULE_SUPPORTED_DEVICE("{{Conexant,25821}");   //"{{Conexant,23881},"
109
110 static unsigned int debug;
111 module_param(debug, int, 0644);
112 MODULE_PARM_DESC(debug, "enable debug messages");
113
114 /****************************************************************************
115                         Module specific funtions
116  ****************************************************************************/
117 /* Constants taken from cx88-reg.h */
118 #define AUD_INT_DN_RISCI1       (1 <<  0)
119 #define AUD_INT_UP_RISCI1       (1 <<  1)
120 #define AUD_INT_RDS_DN_RISCI1   (1 <<  2)
121 #define AUD_INT_DN_RISCI2       (1 <<  4)       /* yes, 3 is skipped */
122 #define AUD_INT_UP_RISCI2       (1 <<  5)
123 #define AUD_INT_RDS_DN_RISCI2   (1 <<  6)
124 #define AUD_INT_DN_SYNC         (1 << 12)
125 #define AUD_INT_UP_SYNC         (1 << 13)
126 #define AUD_INT_RDS_DN_SYNC     (1 << 14)
127 #define AUD_INT_OPC_ERR         (1 << 16)
128 #define AUD_INT_BER_IRQ         (1 << 20)
129 #define AUD_INT_MCHG_IRQ        (1 << 21)
130 #define GP_COUNT_CONTROL_RESET  0x3
131
132 #define PCI_MSK_AUD_EXT   (1 <<  4)
133 #define PCI_MSK_AUD_INT   (1 <<  3)
134 /*
135  * BOARD Specific: Sets audio DMA
136  */
137
138 static int _cx25821_start_audio_dma(snd_cx25821_card_t * chip)
139 {
140         struct cx25821_buffer *buf = chip->buf;
141         struct cx25821_dev *dev = chip->dev;
142         struct sram_channel *audio_ch =
143             &cx25821_sram_channels[AUDIO_SRAM_CHANNEL];
144         u32 tmp = 0;
145
146         // enable output on the GPIO 0 for the MCLK ADC (Audio)
147         cx25821_set_gpiopin_direction(chip->dev, 0, 0);
148
149         /* Make sure RISC/FIFO are off before changing FIFO/RISC settings */
150         cx_clear(AUD_INT_DMA_CTL,
151                  FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN);
152
153         /* setup fifo + format - out channel */
154         cx25821_sram_channel_setup_audio(chip->dev, audio_ch, buf->bpl,
155                                          buf->risc.dma);
156
157         /* sets bpl size */
158         cx_write(AUD_A_LNGTH, buf->bpl);
159
160         /* reset counter */
161         cx_write(AUD_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET);      //GP_COUNT_CONTROL_RESET = 0x3
162         atomic_set(&chip->count, 0);
163
164         //Set the input mode to 16-bit
165         tmp = cx_read(AUD_A_CFG);
166         cx_write(AUD_A_CFG,
167                  tmp | FLD_AUD_DST_PK_MODE | FLD_AUD_DST_ENABLE |
168                  FLD_AUD_CLK_ENABLE);
169
170         //printk(KERN_INFO "DEBUG: Start audio DMA, %d B/line, cmds_start(0x%x)= %d lines/FIFO, %d periods, %d "
171         //      "byte buffer\n", buf->bpl, audio_ch->cmds_start, cx_read(audio_ch->cmds_start + 12)>>1,
172         //      chip->num_periods, buf->bpl * chip->num_periods);
173
174         /* Enables corresponding bits at AUD_INT_STAT */
175         cx_write(AUD_A_INT_MSK,
176                  FLD_AUD_DST_RISCI1 | FLD_AUD_DST_OF | FLD_AUD_DST_SYNC |
177                  FLD_AUD_DST_OPC_ERR);
178
179         /* Clean any pending interrupt bits already set */
180         cx_write(AUD_A_INT_STAT, ~0);
181
182         /* enable audio irqs */
183         cx_set(PCI_INT_MSK, chip->dev->pci_irqmask | PCI_MSK_AUD_INT);
184
185         // Turn on audio downstream fifo and risc enable 0x101
186         tmp = cx_read(AUD_INT_DMA_CTL);
187         cx_set(AUD_INT_DMA_CTL,
188                tmp | (FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN));
189
190         mdelay(100);
191         return 0;
192 }
193
194 /*
195  * BOARD Specific: Resets audio DMA
196  */
197 static int _cx25821_stop_audio_dma(snd_cx25821_card_t * chip)
198 {
199         struct cx25821_dev *dev = chip->dev;
200
201         /* stop dma */
202         cx_clear(AUD_INT_DMA_CTL,
203                  FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN);
204
205         /* disable irqs */
206         cx_clear(PCI_INT_MSK, PCI_MSK_AUD_INT);
207         cx_clear(AUD_A_INT_MSK,
208                  AUD_INT_OPC_ERR | AUD_INT_DN_SYNC | AUD_INT_DN_RISCI2 |
209                  AUD_INT_DN_RISCI1);
210
211         return 0;
212 }
213
214 #define MAX_IRQ_LOOP 50
215
216 /*
217  * BOARD Specific: IRQ dma bits
218  */
219 static char *cx25821_aud_irqs[32] = {
220         "dn_risci1", "up_risci1", "rds_dn_risc1",       /* 0-2 */
221         NULL,                   /* reserved */
222         "dn_risci2", "up_risci2", "rds_dn_risc2",       /* 4-6 */
223         NULL,                   /* reserved */
224         "dnf_of", "upf_uf", "rds_dnf_uf",       /* 8-10 */
225         NULL,                   /* reserved */
226         "dn_sync", "up_sync", "rds_dn_sync",    /* 12-14 */
227         NULL,                   /* reserved */
228         "opc_err", "par_err", "rip_err",        /* 16-18 */
229         "pci_abort", "ber_irq", "mchg_irq"      /* 19-21 */
230 };
231
232 /*
233  * BOARD Specific: Threats IRQ audio specific calls
234  */
235 static void cx25821_aud_irq(snd_cx25821_card_t * chip, u32 status, u32 mask)
236 {
237         struct cx25821_dev *dev = chip->dev;
238
239         if (0 == (status & mask)) {
240                 return;
241         }
242
243         cx_write(AUD_A_INT_STAT, status);
244         if (debug > 1 || (status & mask & ~0xff))
245                 cx25821_print_irqbits(dev->name, "irq aud",
246                                       cx25821_aud_irqs,
247                                       ARRAY_SIZE(cx25821_aud_irqs), status,
248                                       mask);
249
250         /* risc op code error */
251         if (status & AUD_INT_OPC_ERR) {
252                 printk(KERN_WARNING "WARNING %s/1: Audio risc op code error\n",
253                        dev->name);
254
255                 cx_clear(AUD_INT_DMA_CTL,
256                          FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN);
257                 cx25821_sram_channel_dump_audio(dev,
258                                                 &cx25821_sram_channels
259                                                 [AUDIO_SRAM_CHANNEL]);
260         }
261         if (status & AUD_INT_DN_SYNC) {
262                 printk(KERN_WARNING "WARNING %s: Downstream sync error!\n",
263                        dev->name);
264                 cx_write(AUD_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET);
265                 return;
266         }
267
268         /* risc1 downstream */
269         if (status & AUD_INT_DN_RISCI1) {
270                 atomic_set(&chip->count, cx_read(AUD_A_GPCNT));
271                 snd_pcm_period_elapsed(chip->substream);
272         }
273 }
274
275 /*
276  * BOARD Specific: Handles IRQ calls
277  */
278 static irqreturn_t cx25821_irq(int irq, void *dev_id)
279 {
280         snd_cx25821_card_t *chip = dev_id;
281         struct cx25821_dev *dev = chip->dev;
282         u32 status, pci_status;
283         u32 audint_status, audint_mask;
284         int loop, handled = 0;
285         int audint_count = 0;
286
287         audint_status = cx_read(AUD_A_INT_STAT);
288         audint_mask = cx_read(AUD_A_INT_MSK);
289         audint_count = cx_read(AUD_A_GPCNT);
290         status = cx_read(PCI_INT_STAT);
291
292         for (loop = 0; loop < 1; loop++) {
293                 status = cx_read(PCI_INT_STAT);
294                 if (0 == status) {
295                         status = cx_read(PCI_INT_STAT);
296                         audint_status = cx_read(AUD_A_INT_STAT);
297                         audint_mask = cx_read(AUD_A_INT_MSK);
298
299                         if (status) {
300                                 handled = 1;
301                                 cx_write(PCI_INT_STAT, status);
302
303                                 cx25821_aud_irq(chip, audint_status,
304                                                 audint_mask);
305                                 break;
306                         } else
307                                 goto out;
308                 }
309
310                 handled = 1;
311                 cx_write(PCI_INT_STAT, status);
312
313                 cx25821_aud_irq(chip, audint_status, audint_mask);
314         }
315
316         pci_status = cx_read(PCI_INT_STAT);
317
318         if (handled)
319                 cx_write(PCI_INT_STAT, pci_status);
320
321       out:
322         return IRQ_RETVAL(handled);
323 }
324
325 static int dsp_buffer_free(snd_cx25821_card_t * chip)
326 {
327         BUG_ON(!chip->dma_size);
328
329         dprintk(2, "Freeing buffer\n");
330         videobuf_sg_dma_unmap(&chip->pci->dev, chip->dma_risc);
331         videobuf_dma_free(chip->dma_risc);
332         btcx_riscmem_free(chip->pci, &chip->buf->risc);
333         kfree(chip->buf);
334
335         chip->dma_risc = NULL;
336         chip->dma_size = 0;
337
338         return 0;
339 }
340
341 /****************************************************************************
342                                 ALSA PCM Interface
343  ****************************************************************************/
344
345 /*
346  * Digital hardware definition
347  */
348 #define DEFAULT_FIFO_SIZE       384
349 static struct snd_pcm_hardware snd_cx25821_digital_hw = {
350         .info = SNDRV_PCM_INFO_MMAP |
351             SNDRV_PCM_INFO_INTERLEAVED |
352             SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP_VALID,
353         .formats = SNDRV_PCM_FMTBIT_S16_LE,
354
355         .rates = SNDRV_PCM_RATE_48000,
356         .rate_min = 48000,
357         .rate_max = 48000,
358         .channels_min = 2,
359         .channels_max = 2,
360         /* Analog audio output will be full of clicks and pops if there
361            are not exactly four lines in the SRAM FIFO buffer.  */
362         .period_bytes_min = DEFAULT_FIFO_SIZE / 3,
363         .period_bytes_max = DEFAULT_FIFO_SIZE / 3,
364         .periods_min = 1,
365         .periods_max = AUDIO_LINE_SIZE,
366         .buffer_bytes_max = (AUDIO_LINE_SIZE * AUDIO_LINE_SIZE),        //128*128 = 16384 = 1024 * 16
367 };
368
369 /*
370  * audio pcm capture open callback
371  */
372 static int snd_cx25821_pcm_open(struct snd_pcm_substream *substream)
373 {
374         snd_cx25821_card_t *chip = snd_pcm_substream_chip(substream);
375         struct snd_pcm_runtime *runtime = substream->runtime;
376         int err;
377         unsigned int bpl = 0;
378
379         if (!chip) {
380                 printk(KERN_ERR "DEBUG: cx25821 can't find device struct."
381                        " Can't proceed with open\n");
382                 return -ENODEV;
383         }
384
385         err =
386             snd_pcm_hw_constraint_pow2(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS);
387         if (err < 0)
388                 goto _error;
389
390         chip->substream = substream;
391
392         runtime->hw = snd_cx25821_digital_hw;
393
394         if (cx25821_sram_channels[AUDIO_SRAM_CHANNEL].fifo_size !=
395             DEFAULT_FIFO_SIZE) {
396                 bpl = cx25821_sram_channels[AUDIO_SRAM_CHANNEL].fifo_size / 3;  //since there are 3 audio Clusters
397                 bpl &= ~7;      /* must be multiple of 8 */
398
399                 if (bpl > AUDIO_LINE_SIZE) {
400                         bpl = AUDIO_LINE_SIZE;
401                 }
402                 runtime->hw.period_bytes_min = bpl;
403                 runtime->hw.period_bytes_max = bpl;
404         }
405
406         return 0;
407       _error:
408         dprintk(1, "Error opening PCM!\n");
409         return err;
410 }
411
412 /*
413  * audio close callback
414  */
415 static int snd_cx25821_close(struct snd_pcm_substream *substream)
416 {
417         return 0;
418 }
419
420 /*
421  * hw_params callback
422  */
423 static int snd_cx25821_hw_params(struct snd_pcm_substream *substream,
424                                  struct snd_pcm_hw_params *hw_params)
425 {
426         snd_cx25821_card_t *chip = snd_pcm_substream_chip(substream);
427         struct videobuf_dmabuf *dma;
428
429         struct cx25821_buffer *buf;
430         int ret;
431
432         if (substream->runtime->dma_area) {
433                 dsp_buffer_free(chip);
434                 substream->runtime->dma_area = NULL;
435         }
436
437         chip->period_size = params_period_bytes(hw_params);
438         chip->num_periods = params_periods(hw_params);
439         chip->dma_size = chip->period_size * params_periods(hw_params);
440
441         BUG_ON(!chip->dma_size);
442         BUG_ON(chip->num_periods & (chip->num_periods - 1));
443
444         buf = videobuf_sg_alloc(sizeof(*buf));
445         if (NULL == buf)
446                 return -ENOMEM;
447
448         if (chip->period_size > AUDIO_LINE_SIZE) {
449                 chip->period_size = AUDIO_LINE_SIZE;
450         }
451
452         buf->vb.memory = V4L2_MEMORY_MMAP;
453         buf->vb.field = V4L2_FIELD_NONE;
454         buf->vb.width = chip->period_size;
455         buf->bpl = chip->period_size;
456         buf->vb.height = chip->num_periods;
457         buf->vb.size = chip->dma_size;
458
459         dma = videobuf_to_dma(&buf->vb);
460         videobuf_dma_init(dma);
461
462         ret = videobuf_dma_init_kernel(dma, PCI_DMA_FROMDEVICE,
463                                        (PAGE_ALIGN(buf->vb.size) >>
464                                         PAGE_SHIFT));
465         if (ret < 0)
466                 goto error;
467
468         ret = videobuf_sg_dma_map(&chip->pci->dev, dma);
469         if (ret < 0)
470                 goto error;
471
472         ret =
473             cx25821_risc_databuffer_audio(chip->pci, &buf->risc, dma->sglist,
474                                           buf->vb.width, buf->vb.height, 1);
475         if (ret < 0) {
476                 printk(KERN_INFO
477                        "DEBUG: ERROR after cx25821_risc_databuffer_audio() \n");
478                 goto error;
479         }
480
481         /* Loop back to start of program */
482         buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | RISC_CNT_INC);
483         buf->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
484         buf->risc.jmp[2] = cpu_to_le32(0);      /* bits 63-32 */
485
486         buf->vb.state = VIDEOBUF_PREPARED;
487
488         chip->buf = buf;
489         chip->dma_risc = dma;
490
491         substream->runtime->dma_area = chip->dma_risc->vmalloc;
492         substream->runtime->dma_bytes = chip->dma_size;
493         substream->runtime->dma_addr = 0;
494
495         return 0;
496
497       error:
498         kfree(buf);
499         return ret;
500 }
501
502 /*
503  * hw free callback
504  */
505 static int snd_cx25821_hw_free(struct snd_pcm_substream *substream)
506 {
507         snd_cx25821_card_t *chip = snd_pcm_substream_chip(substream);
508
509         if (substream->runtime->dma_area) {
510                 dsp_buffer_free(chip);
511                 substream->runtime->dma_area = NULL;
512         }
513
514         return 0;
515 }
516
517 /*
518  * prepare callback
519  */
520 static int snd_cx25821_prepare(struct snd_pcm_substream *substream)
521 {
522         return 0;
523 }
524
525 /*
526  * trigger callback
527  */
528 static int snd_cx25821_card_trigger(struct snd_pcm_substream *substream,
529                                     int cmd)
530 {
531         snd_cx25821_card_t *chip = snd_pcm_substream_chip(substream);
532         int err = 0;
533
534         /* Local interrupts are already disabled by ALSA */
535         spin_lock(&chip->reg_lock);
536
537         switch (cmd) {
538         case SNDRV_PCM_TRIGGER_START:
539                 err = _cx25821_start_audio_dma(chip);
540                 break;
541         case SNDRV_PCM_TRIGGER_STOP:
542                 err = _cx25821_stop_audio_dma(chip);
543                 break;
544         default:
545                 err = -EINVAL;
546                 break;
547         }
548
549         spin_unlock(&chip->reg_lock);
550
551         return err;
552 }
553
554 /*
555  * pointer callback
556  */
557 static snd_pcm_uframes_t snd_cx25821_pointer(struct snd_pcm_substream
558                                              *substream)
559 {
560         snd_cx25821_card_t *chip = snd_pcm_substream_chip(substream);
561         struct snd_pcm_runtime *runtime = substream->runtime;
562         u16 count;
563
564         count = atomic_read(&chip->count);
565
566         return runtime->period_size * (count & (runtime->periods - 1));
567 }
568
569 /*
570  * page callback (needed for mmap)
571  */
572 static struct page *snd_cx25821_page(struct snd_pcm_substream *substream,
573                                      unsigned long offset)
574 {
575         void *pageptr = substream->runtime->dma_area + offset;
576
577         return vmalloc_to_page(pageptr);
578 }
579
580 /*
581  * operators
582  */
583 static struct snd_pcm_ops snd_cx25821_pcm_ops = {
584         .open = snd_cx25821_pcm_open,
585         .close = snd_cx25821_close,
586         .ioctl = snd_pcm_lib_ioctl,
587         .hw_params = snd_cx25821_hw_params,
588         .hw_free = snd_cx25821_hw_free,
589         .prepare = snd_cx25821_prepare,
590         .trigger = snd_cx25821_card_trigger,
591         .pointer = snd_cx25821_pointer,
592         .page = snd_cx25821_page,
593 };
594
595 /*
596  * ALSA create a PCM device:  Called when initializing the board. Sets up the name and hooks up
597  *  the callbacks
598  */
599 static int snd_cx25821_pcm(snd_cx25821_card_t * chip, int device, char *name)
600 {
601         struct snd_pcm *pcm;
602         int err;
603
604         err = snd_pcm_new(chip->card, name, device, 0, 1, &pcm);
605         if (err < 0) {
606                 printk(KERN_INFO "ERROR: FAILED snd_pcm_new() in %s\n",
607                        __func__);
608                 return err;
609         }
610         pcm->private_data = chip;
611         pcm->info_flags = 0;
612         strcpy(pcm->name, name);
613         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_cx25821_pcm_ops);
614
615         return 0;
616 }
617
618 /****************************************************************************
619                         Basic Flow for Sound Devices
620  ****************************************************************************/
621
622 /*
623  * PCI ID Table - 14f1:8801 and 14f1:8811 means function 1: Audio
624  * Only boards with eeprom and byte 1 at eeprom=1 have it
625  */
626
627 static struct pci_device_id cx25821_audio_pci_tbl[] __devinitdata = {
628         {0x14f1, 0x0920, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
629         {0,}
630 };
631
632 MODULE_DEVICE_TABLE(pci, cx25821_audio_pci_tbl);
633
634 /*
635  * Not used in the function snd_cx25821_dev_free so removing
636  * from the file.
637  */
638 /*
639 static int snd_cx25821_free(snd_cx25821_card_t *chip)
640 {
641         if (chip->irq >= 0)
642                 free_irq(chip->irq, chip);
643
644         cx25821_dev_unregister(chip->dev);
645         pci_disable_device(chip->pci);
646
647         return 0;
648 }
649 */
650
651 /*
652  * Component Destructor
653  */
654 static void snd_cx25821_dev_free(struct snd_card *card)
655 {
656         snd_cx25821_card_t *chip = card->private_data;
657
658         //snd_cx25821_free(chip);
659         snd_card_free(chip->card);
660 }
661
662 /*
663  * Alsa Constructor - Component probe
664  */
665 static int cx25821_audio_initdev(struct cx25821_dev *dev)
666 {
667         struct snd_card *card;
668         snd_cx25821_card_t *chip;
669         int err;
670
671         if (devno >= SNDRV_CARDS) {
672                 printk(KERN_INFO "DEBUG ERROR: devno >= SNDRV_CARDS %s\n",
673                        __func__);
674                 return (-ENODEV);
675         }
676
677         if (!enable[devno]) {
678                 ++devno;
679                 printk(KERN_INFO "DEBUG ERROR: !enable[devno] %s\n", __func__);
680                 return (-ENOENT);
681         }
682
683         err = snd_card_create(index[devno], id[devno], THIS_MODULE,
684                          sizeof(snd_cx25821_card_t), &card);
685         if (err < 0) {
686                 printk(KERN_INFO
687                        "DEBUG ERROR: cannot create snd_card_new in %s\n",
688                        __func__);
689                 return err;
690         }
691
692         strcpy(card->driver, "cx25821");
693
694         /* Card "creation" */
695         card->private_free = snd_cx25821_dev_free;
696         chip = (snd_cx25821_card_t *) card->private_data;
697         spin_lock_init(&chip->reg_lock);
698
699         chip->dev = dev;
700         chip->card = card;
701         chip->pci = dev->pci;
702         chip->iobase = pci_resource_start(dev->pci, 0);
703
704         chip->irq = dev->pci->irq;
705
706         err = request_irq(dev->pci->irq, cx25821_irq,
707                           IRQF_SHARED | IRQF_DISABLED, chip->dev->name, chip);
708
709         if (err < 0) {
710                 printk(KERN_ERR "ERROR %s: can't get IRQ %d for ALSA\n",
711                        chip->dev->name, dev->pci->irq);
712                 goto error;
713         }
714
715         if ((err = snd_cx25821_pcm(chip, 0, "cx25821 Digital")) < 0) {
716                 printk(KERN_INFO
717                        "DEBUG ERROR: cannot create snd_cx25821_pcm %s\n",
718                        __func__);
719                 goto error;
720         }
721
722         snd_card_set_dev(card, &chip->pci->dev);
723
724         strcpy(card->shortname, "cx25821");
725         sprintf(card->longname, "%s at 0x%lx irq %d", chip->dev->name,
726                 chip->iobase, chip->irq);
727         strcpy(card->mixername, "CX25821");
728
729         printk(KERN_INFO "%s/%i: ALSA support for cx25821 boards\n",
730                card->driver, devno);
731
732         err = snd_card_register(card);
733         if (err < 0) {
734                 printk(KERN_INFO "DEBUG ERROR: cannot register sound card %s\n",
735                        __func__);
736                 goto error;
737         }
738
739         snd_cx25821_cards[devno] = card;
740
741         devno++;
742         return 0;
743
744       error:
745         snd_card_free(card);
746         return err;
747 }
748
749 /****************************************************************************
750                                 LINUX MODULE INIT
751  ****************************************************************************/
752 static void cx25821_audio_fini(void)
753 {
754         snd_card_free(snd_cx25821_cards[0]);
755 }
756
757 /*
758  * Module initializer
759  *
760  * Loops through present saa7134 cards, and assigns an ALSA device
761  * to each one
762  *
763  */
764 static int cx25821_alsa_init(void)
765 {
766         struct cx25821_dev *dev = NULL;
767         struct list_head *list;
768
769         list_for_each(list, &cx25821_devlist) {
770                 dev = list_entry(list, struct cx25821_dev, devlist);
771                 cx25821_audio_initdev(dev);
772         }
773
774         if (dev == NULL)
775                 printk(KERN_INFO
776                        "cx25821 ERROR ALSA: no cx25821 cards found\n");
777
778         return 0;
779
780 }
781
782 late_initcall(cx25821_alsa_init);
783 module_exit(cx25821_audio_fini);
784
785 /* ----------------------------------------------------------- */
786 /*
787  * Local variables:
788  * c-basic-offset: 8
789  * End:
790  */