sound/soc/omap/omap-mcpdm.c

   1 /*
   2  * omap-mcpdm.c  --  OMAP ALSA SoC DAI driver using McPDM port
   3  *
   4  * Copyright (C) 2009 - 2011 Texas Instruments
   5  *
   6  * Author: Misael Lopez Cruz <misael.lopez@ti.com>
   7  * Contact: Jorge Eduardo Candelaria <x0107209@ti.com>
   8  *          Margarita Olaya <magi.olaya@ti.com>
   9  *          Peter Ujfalusi <peter.ujfalusi@ti.com>
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * version 2 as published by the Free Software Foundation.
  14  *
  15  * This program is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  23  * 02110-1301 USA
  24  *
  25  */
  26
  27 #include <linux/init.h>
  28 #include <linux/module.h>
  29 #include <linux/platform_device.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/err.h>
  32 #include <linux/io.h>
  33 #include <linux/irq.h>
  34 #include <linux/slab.h>
  35 #include <linux/pm_runtime.h>
  36 #include <linux/of_device.h>
  37
  38 #include <sound/core.h>
  39 #include <sound/pcm.h>
  40 #include <sound/pcm_params.h>
  41 #include <sound/soc.h>
  42 #include <sound/dmaengine_pcm.h>
  43 #include <sound/omap-pcm.h>
  44
  45 #include "omap-mcpdm.h"
  46
  47 struct mcpdm_link_config {
  48         u32 link_mask; /* channel mask for the direction */
  49         u32 threshold; /* FIFO threshold */
  50 };
  51
  52 struct omap_mcpdm {
  53         struct device *dev;
  54         unsigned long phys_base;
  55         void __iomem *io_base;
  56         int irq;
  57
  58         struct mutex mutex;
  59
  60         /* Playback/Capture configuration */
  61         struct mcpdm_link_config config[2];
  62
  63         /* McPDM dn offsets for rx1, and 2 channels */
  64         u32 dn_rx_offset;
  65
  66         /* McPDM needs to be restarted due to runtime reconfiguration */
  67         bool restart;
  68
  69         struct snd_dmaengine_dai_dma_data dma_data[2];
  70 };
  71
  72 /*
  73  * Stream DMA parameters
  74  */
  75
  76 static inline void omap_mcpdm_write(struct omap_mcpdm *mcpdm, u16 reg, u32 val)
  77 {
  78         writel_relaxed(val, mcpdm->io_base + reg);
  79 }
  80
  81 static inline int omap_mcpdm_read(struct omap_mcpdm *mcpdm, u16 reg)
  82 {
  83         return readl_relaxed(mcpdm->io_base + reg);
  84 }
  85
  86 #ifdef DEBUG
  87 static void omap_mcpdm_reg_dump(struct omap_mcpdm *mcpdm)
  88 {
  89         dev_dbg(mcpdm->dev, "***********************\n");
  90         dev_dbg(mcpdm->dev, "IRQSTATUS_RAW:  0x%04x\n",
  91                         omap_mcpdm_read(mcpdm, MCPDM_REG_IRQSTATUS_RAW));
  92         dev_dbg(mcpdm->dev, "IRQSTATUS:  0x%04x\n",
  93                         omap_mcpdm_read(mcpdm, MCPDM_REG_IRQSTATUS));
  94         dev_dbg(mcpdm->dev, "IRQENABLE_SET:  0x%04x\n",
  95                         omap_mcpdm_read(mcpdm, MCPDM_REG_IRQENABLE_SET));
  96         dev_dbg(mcpdm->dev, "IRQENABLE_CLR:  0x%04x\n",
  97                         omap_mcpdm_read(mcpdm, MCPDM_REG_IRQENABLE_CLR));
  98         dev_dbg(mcpdm->dev, "IRQWAKE_EN: 0x%04x\n",
  99                         omap_mcpdm_read(mcpdm, MCPDM_REG_IRQWAKE_EN));
 100         dev_dbg(mcpdm->dev, "DMAENABLE_SET: 0x%04x\n",
 101                         omap_mcpdm_read(mcpdm, MCPDM_REG_DMAENABLE_SET));
 102         dev_dbg(mcpdm->dev, "DMAENABLE_CLR:  0x%04x\n",
 103                         omap_mcpdm_read(mcpdm, MCPDM_REG_DMAENABLE_CLR));
 104         dev_dbg(mcpdm->dev, "DMAWAKEEN:  0x%04x\n",
 105                         omap_mcpdm_read(mcpdm, MCPDM_REG_DMAWAKEEN));
 106         dev_dbg(mcpdm->dev, "CTRL:  0x%04x\n",
 107                         omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL));
 108         dev_dbg(mcpdm->dev, "DN_DATA:  0x%04x\n",
 109                         omap_mcpdm_read(mcpdm, MCPDM_REG_DN_DATA));
 110         dev_dbg(mcpdm->dev, "UP_DATA: 0x%04x\n",
 111                         omap_mcpdm_read(mcpdm, MCPDM_REG_UP_DATA));
 112         dev_dbg(mcpdm->dev, "FIFO_CTRL_DN: 0x%04x\n",
 113                         omap_mcpdm_read(mcpdm, MCPDM_REG_FIFO_CTRL_DN));
 114         dev_dbg(mcpdm->dev, "FIFO_CTRL_UP:  0x%04x\n",
 115                         omap_mcpdm_read(mcpdm, MCPDM_REG_FIFO_CTRL_UP));
 116         dev_dbg(mcpdm->dev, "***********************\n");
 117 }
 118 #else
 119 static void omap_mcpdm_reg_dump(struct omap_mcpdm *mcpdm) {}
 120 #endif
 121
 122 /*
 123  * Enables the transfer through the PDM interface to/from the Phoenix
 124  * codec by enabling the corresponding UP or DN channels.
 125  */
 126 static void omap_mcpdm_start(struct omap_mcpdm *mcpdm)
 127 {
 128         u32 ctrl = omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL);
 129         u32 link_mask = mcpdm->config[0].link_mask | mcpdm->config[1].link_mask;
 130
 131         ctrl |= (MCPDM_SW_DN_RST | MCPDM_SW_UP_RST);
 132         omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
 133
 134         ctrl |= link_mask;
 135         omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
 136
 137         ctrl &= ~(MCPDM_SW_DN_RST | MCPDM_SW_UP_RST);
 138         omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
 139 }
 140
 141 /*
 142  * Disables the transfer through the PDM interface to/from the Phoenix
 143  * codec by disabling the corresponding UP or DN channels.
 144  */
 145 static void omap_mcpdm_stop(struct omap_mcpdm *mcpdm)
 146 {
 147         u32 ctrl = omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL);
 148         u32 link_mask = MCPDM_PDM_DN_MASK | MCPDM_PDM_UP_MASK;
 149
 150         ctrl |= (MCPDM_SW_DN_RST | MCPDM_SW_UP_RST);
 151         omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
 152
 153         ctrl &= ~(link_mask);
 154         omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
 155
 156         ctrl &= ~(MCPDM_SW_DN_RST | MCPDM_SW_UP_RST);
 157         omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
 158
 159 }
 160
 161 /*
 162  * Is the physical McPDM interface active.
 163  */
 164 static inline int omap_mcpdm_active(struct omap_mcpdm *mcpdm)
 165 {
 166         return omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL) &
 167                                         (MCPDM_PDM_DN_MASK | MCPDM_PDM_UP_MASK);
 168 }
 169
 170 /*
 171  * Configures McPDM uplink, and downlink for audio.
 172  * This function should be called before omap_mcpdm_start.
 173  */
 174 static void omap_mcpdm_open_streams(struct omap_mcpdm *mcpdm)
 175 {
 176         omap_mcpdm_write(mcpdm, MCPDM_REG_IRQENABLE_SET,
 177                         MCPDM_DN_IRQ_EMPTY | MCPDM_DN_IRQ_FULL |
 178                         MCPDM_UP_IRQ_EMPTY | MCPDM_UP_IRQ_FULL);
 179
 180         /* Enable DN RX1/2 offset cancellation feature, if configured */
 181         if (mcpdm->dn_rx_offset) {
 182                 u32 dn_offset = mcpdm->dn_rx_offset;
 183
 184                 omap_mcpdm_write(mcpdm, MCPDM_REG_DN_OFFSET, dn_offset);
 185                 dn_offset |= (MCPDM_DN_OFST_RX1_EN | MCPDM_DN_OFST_RX2_EN);
 186                 omap_mcpdm_write(mcpdm, MCPDM_REG_DN_OFFSET, dn_offset);
 187         }
 188
 189         omap_mcpdm_write(mcpdm, MCPDM_REG_FIFO_CTRL_DN,
 190                          mcpdm->config[SNDRV_PCM_STREAM_PLAYBACK].threshold);
 191         omap_mcpdm_write(mcpdm, MCPDM_REG_FIFO_CTRL_UP,
 192                          mcpdm->config[SNDRV_PCM_STREAM_CAPTURE].threshold);
 193
 194         omap_mcpdm_write(mcpdm, MCPDM_REG_DMAENABLE_SET,
 195                         MCPDM_DMA_DN_ENABLE | MCPDM_DMA_UP_ENABLE);
 196 }
 197
 198 /*
 199  * Cleans McPDM uplink, and downlink configuration.
 200  * This function should be called when the stream is closed.
 201  */
 202 static void omap_mcpdm_close_streams(struct omap_mcpdm *mcpdm)
 203 {
 204         /* Disable irq request generation for downlink */
 205         omap_mcpdm_write(mcpdm, MCPDM_REG_IRQENABLE_CLR,
 206                         MCPDM_DN_IRQ_EMPTY | MCPDM_DN_IRQ_FULL);
 207
 208         /* Disable DMA request generation for downlink */
 209         omap_mcpdm_write(mcpdm, MCPDM_REG_DMAENABLE_CLR, MCPDM_DMA_DN_ENABLE);
 210
 211         /* Disable irq request generation for uplink */
 212         omap_mcpdm_write(mcpdm, MCPDM_REG_IRQENABLE_CLR,
 213                         MCPDM_UP_IRQ_EMPTY | MCPDM_UP_IRQ_FULL);
 214
 215         /* Disable DMA request generation for uplink */
 216         omap_mcpdm_write(mcpdm, MCPDM_REG_DMAENABLE_CLR, MCPDM_DMA_UP_ENABLE);
 217
 218         /* Disable RX1/2 offset cancellation */
 219         if (mcpdm->dn_rx_offset)
 220                 omap_mcpdm_write(mcpdm, MCPDM_REG_DN_OFFSET, 0);
 221 }
 222
 223 static irqreturn_t omap_mcpdm_irq_handler(int irq, void *dev_id)
 224 {
 225         struct omap_mcpdm *mcpdm = dev_id;
 226         int irq_status;
 227
 228         irq_status = omap_mcpdm_read(mcpdm, MCPDM_REG_IRQSTATUS);
 229
 230         /* Acknowledge irq event */
 231         omap_mcpdm_write(mcpdm, MCPDM_REG_IRQSTATUS, irq_status);
 232
 233         if (irq_status & MCPDM_DN_IRQ_FULL)
 234                 dev_dbg(mcpdm->dev, "DN (playback) FIFO Full\n");
 235
 236         if (irq_status & MCPDM_DN_IRQ_EMPTY)
 237                 dev_dbg(mcpdm->dev, "DN (playback) FIFO Empty\n");
 238
 239         if (irq_status & MCPDM_DN_IRQ)
 240                 dev_dbg(mcpdm->dev, "DN (playback) write request\n");
 241
 242         if (irq_status & MCPDM_UP_IRQ_FULL)
 243                 dev_dbg(mcpdm->dev, "UP (capture) FIFO Full\n");
 244
 245         if (irq_status & MCPDM_UP_IRQ_EMPTY)
 246                 dev_dbg(mcpdm->dev, "UP (capture) FIFO Empty\n");
 247
 248         if (irq_status & MCPDM_UP_IRQ)
 249                 dev_dbg(mcpdm->dev, "UP (capture) write request\n");
 250
 251         return IRQ_HANDLED;
 252 }
 253
 254 static int omap_mcpdm_dai_startup(struct snd_pcm_substream *substream,
 255                                   struct snd_soc_dai *dai)
 256 {
 257         struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
 258
 259         mutex_lock(&mcpdm->mutex);
 260
 261         if (!dai->active) {
 262                 u32 ctrl = omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL);
 263
 264                 omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl | MCPDM_WD_EN);
 265                 omap_mcpdm_open_streams(mcpdm);
 266         }
 267         mutex_unlock(&mcpdm->mutex);
 268
 269         return 0;
 270 }
 271
 272 static void omap_mcpdm_dai_shutdown(struct snd_pcm_substream *substream,
 273                                   struct snd_soc_dai *dai)
 274 {
 275         struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
 276
 277         mutex_lock(&mcpdm->mutex);
 278
 279         if (!dai->active) {
 280                 if (omap_mcpdm_active(mcpdm)) {
 281                         omap_mcpdm_stop(mcpdm);
 282                         omap_mcpdm_close_streams(mcpdm);
 283                         mcpdm->config[0].link_mask = 0;
 284                         mcpdm->config[1].link_mask = 0;
 285                 }
 286         }
 287
 288         mutex_unlock(&mcpdm->mutex);
 289 }
 290
 291 static int omap_mcpdm_dai_hw_params(struct snd_pcm_substream *substream,
 292                                     struct snd_pcm_hw_params *params,
 293                                     struct snd_soc_dai *dai)
 294 {
 295         struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
 296         int stream = substream->stream;
 297         struct snd_dmaengine_dai_dma_data *dma_data;
 298         u32 threshold;
 299         int channels;
 300         int link_mask = 0;
 301
 302         channels = params_channels(params);
 303         switch (channels) {
 304         case 5:
 305                 if (stream == SNDRV_PCM_STREAM_CAPTURE)
 306                         /* up to 3 channels for capture */
 307                         return -EINVAL;
 308                 link_mask |= 1 << 4;
 309         case 4:
 310                 if (stream == SNDRV_PCM_STREAM_CAPTURE)
 311                         /* up to 3 channels for capture */
 312                         return -EINVAL;
 313                 link_mask |= 1 << 3;
 314         case 3:
 315                 link_mask |= 1 << 2;
 316         case 2:
 317                 link_mask |= 1 << 1;
 318         case 1:
 319                 link_mask |= 1 << 0;
 320                 break;
 321         default:
 322                 /* unsupported number of channels */
 323                 return -EINVAL;
 324         }
 325
 326         dma_data = snd_soc_dai_get_dma_data(dai, substream);
 327
 328         threshold = mcpdm->config[stream].threshold;
 329         /* Configure McPDM channels, and DMA packet size */
 330         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 331                 link_mask <<= 3;
 332
 333                 /* If capture is not running assume a stereo stream to come */
 334                 if (!mcpdm->config[!stream].link_mask)
 335                         mcpdm->config[!stream].link_mask = 0x3;
 336
 337                 dma_data->maxburst =
 338                                 (MCPDM_DN_THRES_MAX - threshold) * channels;
 339         } else {
 340                 /* If playback is not running assume a stereo stream to come */
 341                 if (!mcpdm->config[!stream].link_mask)
 342                         mcpdm->config[!stream].link_mask = (0x3 << 3);
 343
 344                 dma_data->maxburst = threshold * channels;
 345         }
 346
 347         /* Check if we need to restart McPDM with this stream */
 348         if (mcpdm->config[stream].link_mask &&
 349             mcpdm->config[stream].link_mask != link_mask)
 350                 mcpdm->restart = true;
 351
 352         mcpdm->config[stream].link_mask = link_mask;
 353
 354         return 0;
 355 }
 356
 357 static int omap_mcpdm_prepare(struct snd_pcm_substream *substream,
 358                                   struct snd_soc_dai *dai)
 359 {
 360         struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
 361
 362         if (!omap_mcpdm_active(mcpdm)) {
 363                 omap_mcpdm_start(mcpdm);
 364                 omap_mcpdm_reg_dump(mcpdm);
 365         } else if (mcpdm->restart) {
 366                 omap_mcpdm_stop(mcpdm);
 367                 omap_mcpdm_start(mcpdm);
 368                 mcpdm->restart = false;
 369                 omap_mcpdm_reg_dump(mcpdm);
 370         }
 371
 372         return 0;
 373 }
 374
 375 static const struct snd_soc_dai_ops omap_mcpdm_dai_ops = {
 376         .startup        = omap_mcpdm_dai_startup,
 377         .shutdown       = omap_mcpdm_dai_shutdown,
 378         .hw_params      = omap_mcpdm_dai_hw_params,
 379         .prepare        = omap_mcpdm_prepare,
 380 };
 381
 382 static int omap_mcpdm_probe(struct snd_soc_dai *dai)
 383 {
 384         struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
 385         int ret;
 386
 387         pm_runtime_enable(mcpdm->dev);
 388
 389         /* Disable lines while request is ongoing */
 390         pm_runtime_get_sync(mcpdm->dev);
 391         omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, 0x00);
 392
 393         ret = devm_request_irq(mcpdm->dev, mcpdm->irq, omap_mcpdm_irq_handler,
 394                                 0, "McPDM", (void *)mcpdm);
 395
 396         pm_runtime_put_sync(mcpdm->dev);
 397
 398         if (ret) {
 399                 dev_err(mcpdm->dev, "Request for IRQ failed\n");
 400                 pm_runtime_disable(mcpdm->dev);
 401         }
 402
 403         /* Configure McPDM threshold values */
 404         mcpdm->config[SNDRV_PCM_STREAM_PLAYBACK].threshold = 2;
 405         mcpdm->config[SNDRV_PCM_STREAM_CAPTURE].threshold =
 406                                                         MCPDM_UP_THRES_MAX - 3;
 407
 408         snd_soc_dai_init_dma_data(dai,
 409                                   &mcpdm->dma_data[SNDRV_PCM_STREAM_PLAYBACK],
 410                                   &mcpdm->dma_data[SNDRV_PCM_STREAM_CAPTURE]);
 411
 412         return ret;
 413 }
 414
 415 static int omap_mcpdm_remove(struct snd_soc_dai *dai)
 416 {
 417         struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
 418
 419         pm_runtime_disable(mcpdm->dev);
 420
 421         return 0;
 422 }
 423
 424 #define OMAP_MCPDM_RATES        (SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
 425 #define OMAP_MCPDM_FORMATS      SNDRV_PCM_FMTBIT_S32_LE
 426
 427 static struct snd_soc_dai_driver omap_mcpdm_dai = {
 428         .probe = omap_mcpdm_probe,
 429         .remove = omap_mcpdm_remove,
 430         .probe_order = SND_SOC_COMP_ORDER_LATE,
 431         .remove_order = SND_SOC_COMP_ORDER_EARLY,
 432         .playback = {
 433                 .channels_min = 1,
 434                 .channels_max = 5,
 435                 .rates = OMAP_MCPDM_RATES,
 436                 .formats = OMAP_MCPDM_FORMATS,
 437                 .sig_bits = 24,
 438         },
 439         .capture = {
 440                 .channels_min = 1,
 441                 .channels_max = 3,
 442                 .rates = OMAP_MCPDM_RATES,
 443                 .formats = OMAP_MCPDM_FORMATS,
 444                 .sig_bits = 24,
 445         },
 446         .ops = &omap_mcpdm_dai_ops,
 447 };
 448
 449 static const struct snd_soc_component_driver omap_mcpdm_component = {
 450         .name           = "omap-mcpdm",
 451 };
 452
 453 void omap_mcpdm_configure_dn_offsets(struct snd_soc_pcm_runtime *rtd,
 454                                     u8 rx1, u8 rx2)
 455 {
 456         struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(rtd->cpu_dai);
 457
 458         mcpdm->dn_rx_offset = MCPDM_DNOFST_RX1(rx1) | MCPDM_DNOFST_RX2(rx2);
 459 }
 460 EXPORT_SYMBOL_GPL(omap_mcpdm_configure_dn_offsets);
 461
 462 static int asoc_mcpdm_probe(struct platform_device *pdev)
 463 {
 464         struct omap_mcpdm *mcpdm;
 465         struct resource *res;
 466         int ret;
 467
 468         mcpdm = devm_kzalloc(&pdev->dev, sizeof(struct omap_mcpdm), GFP_KERNEL);
 469         if (!mcpdm)
 470                 return -ENOMEM;
 471
 472         platform_set_drvdata(pdev, mcpdm);
 473
 474         mutex_init(&mcpdm->mutex);
 475
 476         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dma");
 477         if (res == NULL)
 478                 return -ENOMEM;
 479
 480         mcpdm->dma_data[0].addr = res->start + MCPDM_REG_DN_DATA;
 481         mcpdm->dma_data[1].addr = res->start + MCPDM_REG_UP_DATA;
 482
 483         mcpdm->dma_data[0].filter_data = "dn_link";
 484         mcpdm->dma_data[1].filter_data = "up_link";
 485
 486         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mpu");
 487         mcpdm->io_base = devm_ioremap_resource(&pdev->dev, res);
 488         if (IS_ERR(mcpdm->io_base))
 489                 return PTR_ERR(mcpdm->io_base);
 490
 491         mcpdm->irq = platform_get_irq(pdev, 0);
 492         if (mcpdm->irq < 0)
 493                 return mcpdm->irq;
 494
 495         mcpdm->dev = &pdev->dev;
 496
 497         ret =  devm_snd_soc_register_component(&pdev->dev,
 498                                                &omap_mcpdm_component,
 499                                                &omap_mcpdm_dai, 1);
 500         if (ret)
 501                 return ret;
 502
 503         return omap_pcm_platform_register(&pdev->dev);
 504 }
 505
 506 static const struct of_device_id omap_mcpdm_of_match[] = {
 507         { .compatible = "ti,omap4-mcpdm", },
 508         { }
 509 };
 510 MODULE_DEVICE_TABLE(of, omap_mcpdm_of_match);
 511
 512 static struct platform_driver asoc_mcpdm_driver = {
 513         .driver = {
 514                 .name   = "omap-mcpdm",
 515                 .owner  = THIS_MODULE,
 516                 .of_match_table = omap_mcpdm_of_match,
 517         },
 518
 519         .probe  = asoc_mcpdm_probe,
 520 };
 521
 522 module_platform_driver(asoc_mcpdm_driver);
 523
 524 MODULE_ALIAS("platform:omap-mcpdm");
 525 MODULE_AUTHOR("Misael Lopez Cruz <misael.lopez@ti.com>");
 526 MODULE_DESCRIPTION("OMAP PDM SoC Interface");
 527 MODULE_LICENSE("GPL");