drivers/media/video/cx23885/cx23885-alsa.c

   1 /*
   2  *
   3  *  Support for CX23885 analog audio capture
   4  *
   5  *    (c) 2008 Mijhail Moreyra <mijhail.moreyra@gmail.com>
   6  *    Adapted from cx88-alsa.c
   7  *    (c) 2009 Steven Toth <stoth@kernellabs.com>
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #include <linux/module.h>
  25 #include <linux/init.h>
  26 #include <linux/device.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/vmalloc.h>
  29 #include <linux/dma-mapping.h>
  30 #include <linux/pci.h>
  31
  32 #include <asm/delay.h>
  33
  34 #include <sound/core.h>
  35 #include <sound/pcm.h>
  36 #include <sound/pcm_params.h>
  37 #include <sound/control.h>
  38 #include <sound/initval.h>
  39
  40 #include <sound/tlv.h>
  41
  42
  43 #include "cx23885.h"
  44 #include "cx23885-reg.h"
  45
  46 #define AUDIO_SRAM_CHANNEL      SRAM_CH07
  47
  48 #define dprintk(level, fmt, arg...)     if (audio_debug >= level) \
  49         printk(KERN_INFO "%s: " fmt, chip->dev->name , ## arg)
  50
  51 #define dprintk_core(level, fmt, arg...)        if (audio_debug >= level) \
  52         printk(KERN_DEBUG "%s: " fmt, chip->dev->name , ## arg)
  53
  54 /****************************************************************************
  55                         Module global static vars
  56  ****************************************************************************/
  57
  58 static unsigned int disable_analog_audio;
  59 module_param(disable_analog_audio, int, 0644);
  60 MODULE_PARM_DESC(disable_analog_audio, "disable analog audio ALSA driver");
  61
  62 static unsigned int audio_debug;
  63 module_param(audio_debug, int, 0644);
  64 MODULE_PARM_DESC(audio_debug, "enable debug messages [analog audio]");
  65
  66 /****************************************************************************
  67                         Board specific funtions
  68  ****************************************************************************/
  69
  70 /* Constants taken from cx88-reg.h */
  71 #define AUD_INT_DN_RISCI1       (1 <<  0)
  72 #define AUD_INT_UP_RISCI1       (1 <<  1)
  73 #define AUD_INT_RDS_DN_RISCI1   (1 <<  2)
  74 #define AUD_INT_DN_RISCI2       (1 <<  4) /* yes, 3 is skipped */
  75 #define AUD_INT_UP_RISCI2       (1 <<  5)
  76 #define AUD_INT_RDS_DN_RISCI2   (1 <<  6)
  77 #define AUD_INT_DN_SYNC         (1 << 12)
  78 #define AUD_INT_UP_SYNC         (1 << 13)
  79 #define AUD_INT_RDS_DN_SYNC     (1 << 14)
  80 #define AUD_INT_OPC_ERR         (1 << 16)
  81 #define AUD_INT_BER_IRQ         (1 << 20)
  82 #define AUD_INT_MCHG_IRQ        (1 << 21)
  83 #define GP_COUNT_CONTROL_RESET  0x3
  84
  85 /*
  86  * BOARD Specific: Sets audio DMA
  87  */
  88
  89 static int cx23885_start_audio_dma(struct cx23885_audio_dev *chip)
  90 {
  91         struct cx23885_audio_buffer *buf = chip->buf;
  92         struct cx23885_dev *dev  = chip->dev;
  93         struct sram_channel *audio_ch =
  94                 &dev->sram_channels[AUDIO_SRAM_CHANNEL];
  95
  96         dprintk(1, "%s()\n", __func__);
  97
  98         /* Make sure RISC/FIFO are off before changing FIFO/RISC settings */
  99         cx_clear(AUD_INT_DMA_CTL, 0x11);
 100
 101         /* setup fifo + format - out channel */
 102         cx23885_sram_channel_setup(chip->dev, audio_ch, buf->bpl,
 103                 buf->risc.dma);
 104
 105         /* sets bpl size */
 106         cx_write(AUD_INT_A_LNGTH, buf->bpl);
 107
 108         /* This is required to get good audio (1 seems to be ok) */
 109         cx_write(AUD_INT_A_MODE, 1);
 110
 111         /* reset counter */
 112         cx_write(AUD_INT_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET);
 113         atomic_set(&chip->count, 0);
 114
 115         dprintk(1, "Start audio DMA, %d B/line, %d lines/FIFO, %d periods, %d "
 116                 "byte buffer\n", buf->bpl, cx_read(audio_ch->cmds_start+12)>>1,
 117                 chip->num_periods, buf->bpl * chip->num_periods);
 118
 119         /* Enables corresponding bits at AUD_INT_STAT */
 120         cx_write(AUDIO_INT_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC |
 121                                     AUD_INT_DN_RISCI1);
 122
 123         /* Clean any pending interrupt bits already set */
 124         cx_write(AUDIO_INT_INT_STAT, ~0);
 125
 126         /* enable audio irqs */
 127         cx_set(PCI_INT_MSK, chip->dev->pci_irqmask | PCI_MSK_AUD_INT);
 128
 129         /* start dma */
 130         cx_set(DEV_CNTRL2, (1<<5)); /* Enables Risc Processor */
 131         cx_set(AUD_INT_DMA_CTL, 0x11); /* audio downstream FIFO and
 132                                           RISC enable */
 133         if (audio_debug)
 134                 cx23885_sram_channel_dump(chip->dev, audio_ch);
 135
 136         return 0;
 137 }
 138
 139 /*
 140  * BOARD Specific: Resets audio DMA
 141  */
 142 static int cx23885_stop_audio_dma(struct cx23885_audio_dev *chip)
 143 {
 144         struct cx23885_dev *dev = chip->dev;
 145         dprintk(1, "Stopping audio DMA\n");
 146
 147         /* stop dma */
 148         cx_clear(AUD_INT_DMA_CTL, 0x11);
 149
 150         /* disable irqs */
 151         cx_clear(PCI_INT_MSK, PCI_MSK_AUD_INT);
 152         cx_clear(AUDIO_INT_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC |
 153                                     AUD_INT_DN_RISCI1);
 154
 155         if (audio_debug)
 156                 cx23885_sram_channel_dump(chip->dev,
 157                         &dev->sram_channels[AUDIO_SRAM_CHANNEL]);
 158
 159         return 0;
 160 }
 161
 162 /*
 163  * BOARD Specific: Handles audio IRQ
 164  */
 165 int cx23885_audio_irq(struct cx23885_dev *dev, u32 status, u32 mask)
 166 {
 167         struct cx23885_audio_dev *chip = dev->audio_dev;
 168
 169         if (0 == (status & mask))
 170                 return 0;
 171
 172         cx_write(AUDIO_INT_INT_STAT, status);
 173
 174         /* risc op code error */
 175         if (status & AUD_INT_OPC_ERR) {
 176                 printk(KERN_WARNING "%s/1: Audio risc op code error\n",
 177                         dev->name);
 178                 cx_clear(AUD_INT_DMA_CTL, 0x11);
 179                 cx23885_sram_channel_dump(dev,
 180                         &dev->sram_channels[AUDIO_SRAM_CHANNEL]);
 181         }
 182         if (status & AUD_INT_DN_SYNC) {
 183                 dprintk(1, "Downstream sync error\n");
 184                 cx_write(AUD_INT_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET);
 185                 return 1;
 186         }
 187         /* risc1 downstream */
 188         if (status & AUD_INT_DN_RISCI1) {
 189                 atomic_set(&chip->count, cx_read(AUD_INT_A_GPCNT));
 190                 snd_pcm_period_elapsed(chip->substream);
 191         }
 192         /* FIXME: Any other status should deserve a special handling? */
 193
 194         return 1;
 195 }
 196
 197 static int dsp_buffer_free(struct cx23885_audio_dev *chip)
 198 {
 199         BUG_ON(!chip->dma_size);
 200
 201         dprintk(2, "Freeing buffer\n");
 202         videobuf_dma_unmap(&chip->pci->dev, chip->dma_risc);
 203         videobuf_dma_free(chip->dma_risc);
 204         btcx_riscmem_free(chip->pci, &chip->buf->risc);
 205         kfree(chip->buf);
 206
 207         chip->dma_risc = NULL;
 208         chip->dma_size = 0;
 209
 210         return 0;
 211 }
 212
 213 /****************************************************************************
 214                                 ALSA PCM Interface
 215  ****************************************************************************/
 216
 217 /*
 218  * Digital hardware definition
 219  */
 220 #define DEFAULT_FIFO_SIZE       4096
 221
 222 static struct snd_pcm_hardware snd_cx23885_digital_hw = {
 223         .info = SNDRV_PCM_INFO_MMAP |
 224                 SNDRV_PCM_INFO_INTERLEAVED |
 225                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 226                 SNDRV_PCM_INFO_MMAP_VALID,
 227         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 228
 229         .rates =                SNDRV_PCM_RATE_48000,
 230         .rate_min =             48000,
 231         .rate_max =             48000,
 232         .channels_min = 2,
 233         .channels_max = 2,
 234         /* Analog audio output will be full of clicks and pops if there
 235            are not exactly four lines in the SRAM FIFO buffer.  */
 236         .period_bytes_min = DEFAULT_FIFO_SIZE/4,
 237         .period_bytes_max = DEFAULT_FIFO_SIZE/4,
 238         .periods_min = 1,
 239         .periods_max = 1024,
 240         .buffer_bytes_max = (1024*1024),
 241 };
 242
 243 /*
 244  * audio pcm capture open callback
 245  */
 246 static int snd_cx23885_pcm_open(struct snd_pcm_substream *substream)
 247 {
 248         struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
 249         struct snd_pcm_runtime *runtime = substream->runtime;
 250         int err;
 251
 252         if (!chip) {
 253                 printk(KERN_ERR "BUG: cx23885 can't find device struct."
 254                                 " Can't proceed with open\n");
 255                 return -ENODEV;
 256         }
 257
 258         err = snd_pcm_hw_constraint_pow2(runtime, 0,
 259                 SNDRV_PCM_HW_PARAM_PERIODS);
 260         if (err < 0)
 261                 goto _error;
 262
 263         chip->substream = substream;
 264
 265         runtime->hw = snd_cx23885_digital_hw;
 266
 267         if (chip->dev->sram_channels[AUDIO_SRAM_CHANNEL].fifo_size !=
 268                 DEFAULT_FIFO_SIZE) {
 269                 unsigned int bpl = chip->dev->
 270                         sram_channels[AUDIO_SRAM_CHANNEL].fifo_size / 4;
 271                 bpl &= ~7; /* must be multiple of 8 */
 272                 runtime->hw.period_bytes_min = bpl;
 273                 runtime->hw.period_bytes_max = bpl;
 274         }
 275
 276         return 0;
 277 _error:
 278         dprintk(1, "Error opening PCM!\n");
 279         return err;
 280 }
 281
 282 /*
 283  * audio close callback
 284  */
 285 static int snd_cx23885_close(struct snd_pcm_substream *substream)
 286 {
 287         return 0;
 288 }
 289
 290 /*
 291  * hw_params callback
 292  */
 293 static int snd_cx23885_hw_params(struct snd_pcm_substream *substream,
 294                               struct snd_pcm_hw_params *hw_params)
 295 {
 296         struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
 297         struct videobuf_dmabuf *dma;
 298
 299         struct cx23885_audio_buffer *buf;
 300         int ret;
 301
 302         if (substream->runtime->dma_area) {
 303                 dsp_buffer_free(chip);
 304                 substream->runtime->dma_area = NULL;
 305         }
 306
 307         chip->period_size = params_period_bytes(hw_params);
 308         chip->num_periods = params_periods(hw_params);
 309         chip->dma_size = chip->period_size * params_periods(hw_params);
 310
 311         BUG_ON(!chip->dma_size);
 312         BUG_ON(chip->num_periods & (chip->num_periods-1));
 313
 314         buf = kzalloc(sizeof(*buf), GFP_KERNEL);
 315         if (NULL == buf)
 316                 return -ENOMEM;
 317
 318         buf->bpl = chip->period_size;
 319
 320         dma = &buf->dma;
 321         videobuf_dma_init(dma);
 322         ret = videobuf_dma_init_kernel(dma, PCI_DMA_FROMDEVICE,
 323                         (PAGE_ALIGN(chip->dma_size) >> PAGE_SHIFT));
 324         if (ret < 0)
 325                 goto error;
 326
 327         ret = videobuf_dma_map(&chip->pci->dev, dma);
 328         if (ret < 0)
 329                 goto error;
 330
 331         ret = cx23885_risc_databuffer(chip->pci, &buf->risc, dma->sglist,
 332                                    chip->period_size, chip->num_periods, 1);
 333         if (ret < 0)
 334                 goto error;
 335
 336         /* Loop back to start of program */
 337         buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP|RISC_IRQ1|RISC_CNT_INC);
 338         buf->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
 339         buf->risc.jmp[2] = cpu_to_le32(0); /* bits 63-32 */
 340
 341         chip->buf = buf;
 342         chip->dma_risc = dma;
 343
 344         substream->runtime->dma_area = chip->dma_risc->vaddr;
 345         substream->runtime->dma_bytes = chip->dma_size;
 346         substream->runtime->dma_addr = 0;
 347
 348         return 0;
 349
 350 error:
 351         kfree(buf);
 352         return ret;
 353 }
 354
 355 /*
 356  * hw free callback
 357  */
 358 static int snd_cx23885_hw_free(struct snd_pcm_substream *substream)
 359 {
 360
 361         struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
 362
 363         if (substream->runtime->dma_area) {
 364                 dsp_buffer_free(chip);
 365                 substream->runtime->dma_area = NULL;
 366         }
 367
 368         return 0;
 369 }
 370
 371 /*
 372  * prepare callback
 373  */
 374 static int snd_cx23885_prepare(struct snd_pcm_substream *substream)
 375 {
 376         return 0;
 377 }
 378
 379 /*
 380  * trigger callback
 381  */
 382 static int snd_cx23885_card_trigger(struct snd_pcm_substream *substream,
 383         int cmd)
 384 {
 385         struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
 386         int err;
 387
 388         /* Local interrupts are already disabled by ALSA */
 389         spin_lock(&chip->lock);
 390
 391         switch (cmd) {
 392         case SNDRV_PCM_TRIGGER_START:
 393                 err = cx23885_start_audio_dma(chip);
 394                 break;
 395         case SNDRV_PCM_TRIGGER_STOP:
 396                 err = cx23885_stop_audio_dma(chip);
 397                 break;
 398         default:
 399                 err = -EINVAL;
 400                 break;
 401         }
 402
 403         spin_unlock(&chip->lock);
 404
 405         return err;
 406 }
 407
 408 /*
 409  * pointer callback
 410  */
 411 static snd_pcm_uframes_t snd_cx23885_pointer(
 412         struct snd_pcm_substream *substream)
 413 {
 414         struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
 415         struct snd_pcm_runtime *runtime = substream->runtime;
 416         u16 count;
 417
 418         count = atomic_read(&chip->count);
 419
 420         return runtime->period_size * (count & (runtime->periods-1));
 421 }
 422
 423 /*
 424  * page callback (needed for mmap)
 425  */
 426 static struct page *snd_cx23885_page(struct snd_pcm_substream *substream,
 427                                 unsigned long offset)
 428 {
 429         void *pageptr = substream->runtime->dma_area + offset;
 430         return vmalloc_to_page(pageptr);
 431 }
 432
 433 /*
 434  * operators
 435  */
 436 static struct snd_pcm_ops snd_cx23885_pcm_ops = {
 437         .open = snd_cx23885_pcm_open,
 438         .close = snd_cx23885_close,
 439         .ioctl = snd_pcm_lib_ioctl,
 440         .hw_params = snd_cx23885_hw_params,
 441         .hw_free = snd_cx23885_hw_free,
 442         .prepare = snd_cx23885_prepare,
 443         .trigger = snd_cx23885_card_trigger,
 444         .pointer = snd_cx23885_pointer,
 445         .page = snd_cx23885_page,
 446 };
 447
 448 /*
 449  * create a PCM device
 450  */
 451 static int snd_cx23885_pcm(struct cx23885_audio_dev *chip, int device,
 452         char *name)
 453 {
 454         int err;
 455         struct snd_pcm *pcm;
 456
 457         err = snd_pcm_new(chip->card, name, device, 0, 1, &pcm);
 458         if (err < 0)
 459                 return err;
 460         pcm->private_data = chip;
 461         strcpy(pcm->name, name);
 462         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_cx23885_pcm_ops);
 463
 464         return 0;
 465 }
 466
 467 /****************************************************************************
 468                         Basic Flow for Sound Devices
 469  ****************************************************************************/
 470
 471 /*
 472  * Alsa Constructor - Component probe
 473  */
 474
 475 struct cx23885_audio_dev *cx23885_audio_register(struct cx23885_dev *dev)
 476 {
 477         struct snd_card *card;
 478         struct cx23885_audio_dev *chip;
 479         int err;
 480
 481         if (disable_analog_audio)
 482                 return NULL;
 483
 484         if (dev->sram_channels[AUDIO_SRAM_CHANNEL].cmds_start == 0) {
 485                 printk(KERN_WARNING "%s(): Missing SRAM channel configuration "
 486                         "for analog TV Audio\n", __func__);
 487                 return NULL;
 488         }
 489
 490         err = snd_card_create(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
 491                         THIS_MODULE, sizeof(struct cx23885_audio_dev), &card);
 492         if (err < 0)
 493                 goto error;
 494
 495         chip = (struct cx23885_audio_dev *) card->private_data;
 496         chip->dev = dev;
 497         chip->pci = dev->pci;
 498         chip->card = card;
 499         spin_lock_init(&chip->lock);
 500
 501         snd_card_set_dev(card, &dev->pci->dev);
 502
 503         err = snd_cx23885_pcm(chip, 0, "CX23885 Digital");
 504         if (err < 0)
 505                 goto error;
 506
 507         strcpy(card->driver, "CX23885");
 508         sprintf(card->shortname, "Conexant CX23885");
 509         sprintf(card->longname, "%s at %s", card->shortname, dev->name);
 510
 511         err = snd_card_register(card);
 512         if (err < 0)
 513                 goto error;
 514
 515         dprintk(0, "registered ALSA audio device\n");
 516
 517         return chip;
 518
 519 error:
 520         snd_card_free(card);
 521         printk(KERN_ERR "%s(): Failed to register analog "
 522                         "audio adapter\n", __func__);
 523
 524         return NULL;
 525 }
 526
 527 /*
 528  * ALSA destructor
 529  */
 530 void cx23885_audio_unregister(struct cx23885_dev *dev)
 531 {
 532         struct cx23885_audio_dev *chip = dev->audio_dev;
 533
 534         snd_card_free(chip->card);
 535 }